阅读说明：本技术 模铸机 (Die casting machine ) 是由 辻真 林勇人 野田三郎 于 2020-05-01 设计创作，主要内容包括：实施方式的模铸机具备：保持炉,保持熔液；套筒,位于保持炉的外部,通到金属模之中,具有熔液供给口；柱塞,在套筒中滑动,具有柱塞杆和被固定在柱塞杆的前端上的柱塞头；熔液供给管,将熔液向套筒中供给,相对于熔液供给口可拆装；以及移动机构,在柱塞的滑动中使熔液供给管从熔液供给口脱离。(The die-casting machine of the embodiment comprises: a holding furnace for holding the melt; a sleeve which is located outside the holding furnace, is led into the metal mold and is provided with a melt supply port; a plunger sliding in the sleeve, having a plunger rod and a plunger head fixed on the front end of the plunger rod; a melt supply pipe for supplying a melt into the sleeve, the melt supply pipe being detachable from the melt supply port; and a moving mechanism for separating the melt supply pipe from the melt supply port during the sliding of the plunger.)

1. A die-casting machine is characterized in that,

the disclosed device is provided with:

a holding furnace for holding the melt;

a sleeve which is located outside the holding furnace, is led into the metal mold and is provided with a melt supply port;

a plunger that slides in the sleeve, and that has a plunger rod and a plunger head fixed to a tip of the plunger rod;

a melt supply pipe configured to supply the melt into the sleeve, the melt supply pipe being removable from the melt supply port; and

and a moving mechanism for separating the melt supply pipe from the melt supply port during the sliding of the plunger.

2. The die-casting machine according to claim 1,

and a disengagement control unit for controlling the moving mechanism to disengage the melt supply pipe from the melt supply port after the plunger head closes the melt supply port.

3. The die-casting machine according to claim 1 or 2,

the melt supply port is provided at a lower portion of the sleeve.

4. The die-casting machine according to any one of claims 1 to 3,

the melt supply pipe is fixed to the holding furnace, and the moving mechanism moves the holding furnace.

5. The die-casting machine according to any one of claims 1 to 3,

the melt supply pipe is movable relative to the holding furnace, and the moving mechanism moves the melt supply pipe independently of the holding furnace.

6. The die-casting machine according to any one of claims 1 to 5,

the melt supply pipe has a cylindrical shape extending linearly.

7. The die-casting machine according to claim 6,

the melt supply pipe is made of ceramic.

8. The die-casting machine according to any one of claims 1 to 7,

the apparatus further includes a melt supply driving unit that generates a driving force for transferring the melt from the holding furnace to the sleeve through the melt supply pipe.

9. The die-casting machine according to claim 8,

the melt supply drive unit is an electromagnetic pump.

10. The die-casting machine according to claim 8,

the melt supply driving unit is an air pressure unit for increasing the air pressure in the holding furnace.

11. The die-casting machine according to any one of claims 8 to 10,

the plunger head further includes a melt supply control unit that controls the melt supply driving unit so that a filling rate of the melt in the sleeve at a time point when supply of the melt to the sleeve is completed is 70% or more, and the filling rate of the melt in the sleeve when the plunger head reaches a position where the melt supply port is closed is 95% or more.

12. The die-casting machine according to any one of claims 1 to 11,

the molten metal supply apparatus further includes a 1 st sensor facing a predetermined height between a lowermost portion and an uppermost portion of an inner surface of the sleeve, and detecting that the molten metal in the sleeve reaches the predetermined height.

13. The die-casting machine according to any one of claims 1 to 12,

the sleeve is provided with a gas outlet arranged at the upper part;

a 2 nd sensor for detecting a melt surface position of the melt in the sleeve is further provided above the gas discharge port.

14. The die-casting machine according to any one of claims 1 to 13,

further provided with:

an injection driving unit for driving the plunger; and

and an injection control unit that controls the injection drive unit to increase the injection speed of the plunger after the plunger head reaches a position to block the melt supply port.

15. The die-casting machine according to any one of claims 1 to 14,

the distance between the melt supply port and the melt supply pipe after the melt supply pipe is detached from the melt supply port is 1mm to 10 mm.

Technical Field

The invention relates to a die casting machine, in particular to a semi-hot chamber type die casting machine.

Background

In a so-called semi-hot chamber die casting machine, a sleeve which is passed through a mold and a plunger which pushes out a melt in the sleeve into the mold are provided outside a holding furnace which stores the melt, as in the case of a cold chamber die casting machine. However, unlike the cold chamber type, the semi-hot chamber type feeds the molten metal to the sleeve through a molten metal supply pipe connected to the sleeve by communicating the holding furnace and the sleeve, instead of pumping up the molten metal in the holding furnace with a ladle and injecting the molten metal into the sleeve.

In a semi-hot chamber die casting machine, there is a possibility that the molten metal supply pipe may be damaged by an impact applied to a connection portion between the sleeve and the molten metal supply pipe at the time of injection of the plunger. Therefore, it is desirable to reduce the impact applied to the melt supply pipe at the time of injection of the plunger and to suppress the breakage of the melt supply pipe.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 7-155924

Patent document 2: japanese laid-open patent publication No. 2012-232338

Disclosure of Invention

Problems to be solved by the invention

The invention aims to provide a die casting machine which can reduce impact acting on a molten metal supply pipe during plunger injection and inhibit the damage of the molten metal supply pipe.

Means for solving the problems

The die-casting machine according to an aspect of the present invention includes: a holding furnace for holding the melt; a sleeve which is located outside the holding furnace, is led into the metal mold and is provided with a melt supply port; a plunger that slides in the sleeve, and that has a plunger rod and a plunger head fixed to a tip of the plunger rod; a melt supply pipe configured to supply the melt into the sleeve, the melt supply pipe being removable from the melt supply port; and a moving mechanism for separating the melt supply pipe from the melt supply port during the sliding of the plunger.

In the die-casting machine according to the above aspect, it is preferable that the plunger head further includes a disengagement control unit that controls the moving mechanism to disengage the melt supply pipe from the melt supply gate after the plunger head closes the melt supply gate.

In the die-casting machine according to the above aspect, the melt supply port is preferably provided at a lower portion of the sleeve.

In the die-casting machine according to the above aspect, it is preferable that the melt supply pipe is fixed to the holding furnace, and the moving mechanism moves the holding furnace.

In the die-casting machine according to the above aspect, it is preferable that the melt supply pipe is movable relative to the holding furnace, and the moving mechanism moves the melt supply pipe independently of the holding furnace.

In the die-casting machine according to the above aspect, the melt supply pipe is preferably formed in a cylindrical shape extending linearly.

In the die-casting machine according to the above aspect, the melt supply pipe is preferably formed of ceramic.

In the die-casting machine according to the above aspect, it is preferable that the die-casting machine further includes a melt supply driving unit that generates a driving force for transferring the melt from the holding furnace to the sleeve through the melt supply pipe.

In the die-casting machine according to the above aspect, the melt supply driving unit is preferably an electromagnetic pump.

In the die-casting machine according to the above aspect, the melt supply driving unit is preferably an air pressure unit that increases an air pressure in the holding furnace.

In the die-casting machine according to the above aspect, it is preferable that the die-casting machine further includes a melt supply control unit configured to control the melt supply driving unit so that a filling rate of the melt in the sleeve at a time point when the supply of the melt to the sleeve is completed is 70% or more.

In the die-casting machine according to the above aspect, the melt supply control unit preferably controls the melt supply driving unit so that a filling rate of the melt in the sleeve is 95% or more when the plunger tip reaches a position at which the melt supply gate is closed.

In the die-casting machine according to the above aspect, it is preferable that the die-casting machine further includes a 1 st sensor facing a predetermined height between a lowermost portion and an uppermost portion of the inner surface of the sleeve, the first sensor detecting that the molten metal in the sleeve has reached the predetermined height.

In the die-casting machine according to the above aspect, it is preferable that the sleeve has a gas discharge port provided at an upper portion; a 2 nd sensor for detecting a melt surface position of the melt in the sleeve is further provided above the gas discharge port.

In the die-casting machine according to the above aspect, it is preferable that the die-casting machine further includes: an injection driving unit for driving the plunger; and an injection control unit that controls the injection drive unit to increase an injection speed of the plunger after the plunger head reaches a position to block the melt supply port.

In the die-casting machine according to the above aspect, it is preferable that a distance between the melt supply port and the melt supply pipe after the melt supply pipe is detached from the melt supply port is 1mm to 10 mm.

Effects of the invention

According to the present invention, it is possible to provide a die-casting machine capable of reducing the impact applied to the melt supply pipe at the time of injection of the plunger and suppressing damage to the melt supply pipe.

Drawings

Fig. 1 is a schematic view showing the overall structure of a die-casting machine according to embodiment 1.

Fig. 2 is a schematic cross-sectional view showing a sleeve, a plunger, and a melt supply device of the die-casting machine according to embodiment 1.

Fig. 3 is a schematic cross-sectional view of a sleeve and a melt supply pipe of the die-casting machine according to embodiment 1.

Fig. 4 is a block diagram showing a configuration of a signal processing system of the die-casting machine according to embodiment 1.

Fig. 5 is a flowchart illustrating an example of the operation of the die-casting machine according to embodiment 1.

Fig. 6 is an explanatory diagram of an example of the operation of the die-casting machine according to embodiment 1.

Fig. 7 is an explanatory diagram of an example of the operation of the die-casting machine according to embodiment 1.

Fig. 8 is a schematic cross-sectional view showing a sleeve, a plunger, and a melt supply device of the die-casting machine according to embodiment 2.

Fig. 9 is a schematic cross-sectional view showing a sleeve, a plunger, and a melt supply device of the die-casting machine according to embodiment 3.

Fig. 10 is a schematic cross-sectional view showing a sleeve, a plunger, and a melt supply device of the die-casting machine according to embodiment 4.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(embodiment 1)

The die-casting machine according to embodiment 1 includes: a holding furnace for holding the melt; a sleeve which is located outside the holding furnace, is led into the metal mold and is provided with a melt supply port; a plunger sliding in the sleeve and having a plunger rod and a plunger head fixed at the front end of the plunger rod; a melt supply pipe for supplying a melt into the sleeve, the melt supply pipe being detachable from the melt supply port; and a moving mechanism for separating the melt supply pipe from the melt supply port during the sliding of the plunger.

Fig. 1 is a schematic view showing the overall structure of a die-casting machine according to embodiment 1. Fig. 1 is a side view including a cross-sectional view in a portion. Fig. 2 is a schematic cross-sectional view showing a sleeve, a plunger, and a melt supply device of the die-casting machine according to embodiment 1.

Fig. 3 is a schematic cross-sectional view of a sleeve and a melt supply pipe of the die-casting machine according to embodiment 1. Fig. 3 is a cross-sectional view perpendicular to the direction of elongation of the sleeve. The vertical direction of the paper surface is a vertical direction, and the horizontal direction and the through direction of the paper surface are horizontal directions.

Fig. 4 is a block diagram showing a configuration of a signal processing system of the die-casting machine according to embodiment 1.

The die-casting machine 100 of embodiment 1 is a semi-hot chamber die-casting machine.

The die-casting machine 100 includes a mold clamping device 10, an extrusion device 12, an injection device 14, a mold 16, a control unit 18, and a melt supply device 20.

The injection device 14 includes a sleeve 22, a plunger 24, an injection drive unit 25, and a position sensor 27. Plunger 24 includes a plunger head 24a and a plunger rod 24 b. The sleeve 22 is provided with a melt sensor 26 (1 st sensor), a melt supply gate 28, and a gas discharge port 30.

The metal mold 16 includes a fixed metal mold 16a and a moving metal mold 16 b.

The control unit 18 comprises a control device 32, an input device 34, a display device 36. The control device 32 includes a molding condition selection unit 32a, a melt supply control unit 32b, an injection control unit 32c, and a separation control unit 32 d.

The melt supply device 20 includes a melt supply pipe 40, a holding furnace 42, a gasket 44, a 1 st heater 46, a protective member 48, a melt supply pipe sleeve 50, a 2 nd heater 52, an electromagnetic pump 54 (melt supply driving unit), a melt level sensor 56 (2 nd sensor), a crane 60 (moving mechanism), a fulcrum 62, and a metal feeder 64. The holding furnace 42 is provided with a holding furnace melt level sensor 66, a filter 68, a filter holder 70, a holding furnace heater 72, and a metal supply port 74. The electromagnetic pump 54 has a coil 54a and a core 54 b.

The die-casting machine 100 is a machine that injects a liquid metal (melt) into the interior of the mold 16 (the cavity Ca in fig. 1) and solidifies the liquid metal in the mold 16 to produce a molded product. The metal is, for example, aluminum, an aluminum alloy, a zinc alloy or a magnesium alloy.

The mold 16 is provided between the mold clamping device 10 and the injection device 14. The metal mold 16 includes a fixed metal mold 16a and a moving metal mold 16 b.

The mold clamping device 10 has a function of opening and closing and clamping the mold 16.

The injection device 14 has a function of injecting the liquid metal into the mold 16. As shown in fig. 1, the injection device 14 includes a sleeve 22, a plunger 24, an injection driving unit 25, and a position sensor 27.

The sleeve 22 is located outside the holding furnace 42 that holds the melt. The sleeve 22 passes into the metal mold 16. The sleeve 22 is, for example, a cylindrical member coupled to the stationary mold 16 a. The sleeve 22 is, for example, cylindrical in shape.

The plunger 24 slides in the sleeve 22. A plunger head 24a fixed to the front end of the plunger rod 24b slides in the sleeve 22 in the front-rear direction. The plunger tip 24a slides forward in the sleeve 22, whereby the melt in the sleeve 22 is pushed out into the die 16.

The injection driving unit 25 has a function of driving the plunger 24 in the front-rear direction. The injection driving unit 25 is, for example, a hydraulic type, an electric type, or a hybrid type combining a hydraulic type and an electric type.

The position sensor 27 has a function of detecting the position of the plunger 24. The position sensor 27 is, for example, an optical or magnetic linear encoder. The speed of the plunger 24 can be detected by differentiating the position of the plunger 24 detected by the position sensor 27.

As shown in fig. 3, the sleeve 22 is provided with a melt sensor 26 (1 st sensor), a melt supply gate 28, and a gas discharge port 30.

The melt supply port 28 is provided at the lower portion of the sleeve 22. The melt is supplied into the sleeve 22 from a melt supply pipe 40 connected to the melt supply gate 28.

The gas discharge port 30 is provided at an upper portion of the sleeve 22. The gas discharge port 30 has a function of exhausting gas in an upper portion of the sleeve 22 when filling the molten metal into the sleeve 22. The gas discharge port 30 is provided to shorten the time for filling the sleeve 22 with the melt.

The melt sensor 26 faces a prescribed height between the lowermost portion and the uppermost portion of the inner surface of the sleeve 22. The melt sensor 26 is exposed, for example, in the sleeve 22.

The melt sensor 26 detects the position at which the melt reaches the melt sensor 26 in the sleeve 22.

The melt sensor 26 has, for example, a pair of electrodes, and is a resistance sensor that outputs a signal by supplying current when the melt reaches the position of the electrodes. The melt sensor 26 is, for example, a temperature sensor that outputs a signal when the temperature exceeds a predetermined value. The melt sensor 26 is, for example, a pressure sensor that outputs a signal when the pressure exceeds a predetermined value.

The melt supply device 20 is provided below the sleeve 22. The melt supply device 20 has a function of supplying the melt into the sleeve 22 and filling the sleeve 22 with the melt.

As shown in fig. 2, the melt supply device 20 includes a melt supply pipe 40, a holding furnace 42, a gasket 44, a 1 st heater 46, a protective member 48, a melt supply pipe sleeve 50, a 2 nd heater 52, an electromagnetic pump 54 (melt supply driving unit), a melt level sensor 56 (2 nd sensor), a crane 60 (moving mechanism), a fulcrum 62, and a metal feeder 64.

The melt supply pipe 40 is provided below the sleeve 22. The melt supply pipe 40 is detachable from the melt supply port 28 of the sleeve 22. The melt supply pipe 40 is fixed to, for example, a holding furnace 42. The melt supply pipe 40 has a function of supplying the melt into the sleeve 22.

The melt supply pipe 40 is a tubular member. The melt supply pipe 40 is, for example, a cylindrical shape extending linearly in the vertical direction. For example, the diameter of the cylinder may also vary vertically. The melt supply pipe 40 does not have a bent portion, for example.

The melt supply pipe 40 is formed of, for example, ceramic. The melt supply pipe 40 is formed of, for example, only ceramic.

The distance (α in fig. 3) between the melt supply gate 28 and the melt supply pipe 40 after the melt supply pipe 40 is detached from the melt supply gate 28 is, for example, 1mm to 10 mm.

The gasket 44 is provided at the upper end of the melt supply pipe 40. The packing 44 has a function of preventing the melt from leaking out from the gap at the contact portion between the sleeve 22 and the melt supply pipe 40. The gasket 44 has heat resistance.

The 1 st heater 46 is provided around the melt supply pipe 40. The 1 st heater 46 has a function of heating the melt in the melt supply pipe 40.

The protective member 48 covers the upper end and the upper side surface of the 1 st heater 46. The protection member 48 has a function of protecting the 1 st heater 46.

The melt supply pipe sleeve 50 is provided below the melt supply pipe 40. The lower end of the melt supply pipe 40 is inserted into, for example, a melt supply pipe sleeve 50. The lower end of the melt supply pipe sleeve 50 is immersed in the melt in the holding furnace 42. The melt supply pipe sleeve 50 is formed of, for example, ceramic.

The 2 nd heater 52 is provided in the melt supply pipe sleeve 50. The 2 nd heater 52 has a function of heating the melt in the melt supply pipe sleeve 50.

The electromagnetic pump 54 is an example of a melt supply driving unit. The electromagnetic pump 54 has a coil 54a and a core 54 b. The coil 54a is provided around the melt supply pipe 40, and the core 54b is provided in the melt supply pipe 40.

The electromagnetic pump 54 generates a driving force for transferring the melt from the holding furnace 42 to the sleeve 22 through the melt supply pipe 40.

As shown in fig. 3, the melt level sensor 56 is provided above the gas discharge port 30 provided in the sleeve 22. The melt level sensor 56 has a function of detecting the melt level position of the melt in the sleeve 22.

The melt level sensor 56 is a non-contact sensor that detects the height of the melt level from above the melt level, for example. The melt level sensor 56 is, for example, an optical or ultrasonic sensor.

The holding furnace 42 is provided below the sleeve 22. The holding furnace 42 has a function of holding the melt therein.

The holding furnace 42 is provided with a holding furnace melt level sensor 66, a filter 68, a filter holder 70, a holding furnace heater 72, and a metal supply port 74.

The holding furnace melt level sensor 66 has a function of detecting the melt level position of the melt in the holding furnace 42. The holding furnace melt level sensor 66 is, for example, a non-contact sensor that detects the melt level from above the melt level. The holding furnace melt level sensor 66 is, for example, an optical or ultrasonic sensor.

For example, the ingot is supplied into the holding furnace 42 based on the melt level detected by the holding furnace melt level sensor 66, whereby the melt level in the holding furnace 42 is held at a predetermined position. For example, the melt level in the melt supply pipe 40 is brought into contact with the core 54b of the electromagnetic pump 54 by maintaining the melt level in the holding furnace 42 at a predetermined position.

A filter 68 is provided within the holding furnace 42. The filter 68 suppresses solid matter such as oxides of the melt contained in the melt from being supplied into the sleeve 22.

The filter support 70 is secured to the filter 68. The filter support 70 has a function of pulling out the filter 68 to the outside of the holding furnace 42.

The holding furnace heater 72 is immersed in the melt in the holding furnace 42. The holding furnace heater 72 has a function of heating the melt in the holding furnace 42.

The metal supply port 74 is provided on the upper surface of the holding furnace 42. A billet as a raw material of the melt is fed from the metal supply port 74, for example. The melt may be supplied from the metal supply port 74.

The crane 60 is provided below the holding furnace 42. The crane 60 is an example of a moving mechanism. The crane 60 has a function of attaching and detaching the melt supply pipe 40 fixed to the holding furnace 42 to and from the melt supply gate 28 by moving the holding furnace 42 in the vertical direction. The crane 60 has a function of detaching the melt supply pipe 40 from the melt supply gate 28 during the sliding of the plunger 24.

The crane 60 is, for example, an electric jack or an oil jack.

The fulcrum 62 is provided below the holding furnace 42. By operating the crane 60, the holding furnace 42 is moved in the vertical direction about the fulcrum 62.

The metal feeder 64 is provided above the holding furnace 42. The metal feeder 64 feeds a billet, which is a raw material of the melt, into the holding furnace 42 from, for example, a metal feed port 74. The metal feeder 64 may supply the melt from the metal supply port 74, for example.

The control unit 18 comprises a control device 32, an input device 34, a display device 36.

The input device 34 is provided, for example, on a fixed platen (reference numeral omitted) of the mold clamping device 10. The input device 34 receives an input operation by an operator. The operator can set the molding conditions of the die-casting machine 100 using the input device 34.

The input device 34 is, for example, a touch panel using a liquid crystal display or an organic EL display.

The display device 36 is provided, for example, on a fixed platen (reference numeral omitted) of the mold clamping device 10. The display device 36 displays, for example, the molding conditions, the operating conditions, and the like of the die-casting machine 100 on a screen. The display device 36 is, for example, a liquid crystal display or an organic EL display.

The controller 32 has a function of controlling the molding operation of the die-casting machine 100 using the mold clamping device 10, the extruding device 12, the injection device 14, and the melt supply device 20. The control device 32 has a function of performing various calculations and outputting control commands to the respective parts of the die-casting machine 100.

The control device 32 is constituted by a combination of hardware and software, for example. The control device 32 includes, for example, a cpu (central Processing unit), a semiconductor memory, and a control program stored in the semiconductor memory.

As shown in fig. 4, the control device 32 includes a molding condition selection unit 32a, a melt supply control unit 32b, an injection control unit 32c, and a separation control unit 32 d.

The molding condition selector 32a has a function of setting various molding conditions such as an injection speed of the plunger 24 based on a signal from the input device 34.

The melt supply control unit 32b has a function of controlling the supply of the melt from the holding furnace 42 into the sleeve 22 based on data of the melt surface position detected by the melt sensor 26 and the melt surface sensor 56. The melt is supplied into the sleeve 22 by controlling the driving of the electromagnetic pump 54.

The melt supply control unit 32b controls the electromagnetic pump 54, for example, so that the filling rate of the melt in the sleeve 22 at the time when the supply of the melt to the sleeve 22 is completed becomes 70% or more. The melt supply controller 32b controls the electromagnetic pump 54 so that, for example, when the plunger tip 24a reaches a position at which the melt supply gate 28 is closed, the filling rate of the melt in the sleeve 22 becomes 95% or more.

The injection control unit 32c has a function of controlling the injection driving unit 25 based on the position of the plunger 24 detected by the position sensor 27. The injection control section 32c controls the injection driving section 25 to increase the injection speed of the plunger 24, for example, after the plunger head 24a reaches a position for closing the melt supply gate 28.

The disengagement control unit 32d has a function of controlling the crane 60 based on the position of the plunger 24 detected by the position sensor 27. For example, after the plunger head 24a closes the melt supply gate 28, the disengagement control unit 32d controls the crane 60 to disengage the melt supply pipe 40 from the melt supply gate 28.

Next, an example of the operation of the die-casting machine 100 will be described.

Fig. 5 is a flowchart illustrating an example of the operation of the die-casting machine according to embodiment 1. Fig. 5 shows the pressure increase and pressure holding after the high-speed injection from the supply of the melt into the sleeve 22. That is, the mold closing and mold closing before the melt supply, and the mold opening and pressing after the pressure raising and pressure maintaining are not described. The operation omitted from the description is the same as a known operation, for example.

The operation of the die-casting machine 100 includes the steps of melt supply start (step ST1), melt detection determination (step ST2), deceleration start (step ST3), melt supply stop (step ST4), injection start (step ST5), closed position determination (step ST6), melt supply pipe disengagement (step ST7), high-speed injection (step ST8), and pressure increase/pressure maintenance (step ST 9).

Fig. 6 and 7 are explanatory views of an example of the operation of the die-casting machine according to embodiment 1.

Fig. 6 is a graph showing an example of the injection operation of the die-casting machine 100. The horizontal axis is time. The more time passes, the more points plotted are to the left of the page. The vertical axis on the right side of the paper indicates the injection speed, i.e. the speed of the plunger 24. The vertical axis on the left side of the paper plane indicates the filling rate of the melt in the sleeve 22. The filling ratio is a ratio of the volume of the melt in the sleeve 22 ahead of the plunger 24. Line Lv represents the change in injection velocity over time. The line Lr represents a change in the filling rate of the melt in the sleeve 22 with time.

Fig. 7 is a schematic view showing the state inside the sleeve 22 during the injection operation of the die-casting machine 100 according to embodiment 1. Fig. 7(a) shows time t0, fig. 7(b) shows time t1, and fig. 7(c) shows the case of time t 3.

In step ST1, if the predetermined melt supply start condition is satisfied, the melt supply into the sleeve 22 is started by a command from the melt supply control unit 32 b. Specifically, the electromagnetic pump 54 is operated to start the supply of the melt from the holding furnace 42 into the sleeve 22 through the melt supply pipe 40.

In step ST2, the melt supply control unit 32b determines whether or not it is confirmed that the melt level in the sleeve 22 has reached a predetermined height by the melt sensor 26. When the determination is negative, the melt supply control unit 32b maintains the current melt supply speed. When the determination is positive, the melt supply control unit 32b proceeds to the next step ST 3.

In step ST3, the melt supply controller 32b controls the electromagnetic pump 54 to decrease the melt supply speed into the sleeve 22. By reducing the melt supply rate, a desired filling rate can be achieved with high accuracy.

In step ST4, if the predetermined melt supply stop condition is satisfied, the melt supply control portion 32b stops the supply of the melt from the holding furnace 42 to the sleeve 22. The melt supply stop condition is, for example, a condition that the melt level detected by the melt level sensor 56 reaches a predetermined value satisfying a desired filling rate. The melt supply is stopped by stopping the operation of the electromagnetic pump 54.

Step ST4 is the state at time t0 of fig. 6. Step ST4 is the state shown in fig. 7 (a). The melt supply control unit 32b controls the electromagnetic pump 54, for example, so that the filling rate of the melt M in the sleeve 22 becomes 70% or more.

In step ST5, the injection of the melt in the sleeve 22 is started by the instruction of the injection control unit 32 c. That is, the injection driving unit 25 is controlled so as to start the advance of the plunger 24. The injection speed of the plunger 24 at this time is between times t0 and t1 of fig. 6, and is performed at a relatively low speed. The injection speed of the plunger 24 is, for example, less than 1 m/s.

In step ST6, the injection control section 32c and the escape control section 32d determine whether or not the plunger 24 reaches a position for closing the melt supply gate 28 based on the position information detected by the position sensor 27. If the determination is negative, the relatively low injection speed is maintained. If the determination is positive, the process proceeds to step ST 7.

In step ST7, the disengagement control unit 32d disengages the melt supply pipe 40 from the melt supply gate 28. Specifically, the disengagement control unit 32d issues a command to the crane 60 to move the holding furnace 42 downward, thereby disengaging the melt supply pipe 40 fixed to the holding furnace 42 from the melt supply gate 28. The distance (α in fig. 3) between the melt supply gate 28 and the melt supply pipe 40 after the separation is, for example, 1mm to 10 mm.

Step ST7 is the state at time t1 of fig. 6. Step ST7 is the state shown in fig. 7 (b). At this time, for example, the melt supply controller 32b maintains the melt surface position in the melt supply pipe 40 at a relatively high position directly below the melt supply gate 28.

Since the melt supply gate 28 is closed by the plunger head 24a, the melt M in the sleeve 22 does not leak from the melt supply gate 28. The filling rate of the melt M in the sleeve 22 is, for example, 95% or more. The filling rate of the melt M in the sleeve 22 is, for example, 100%.

In step ST8, the injection control unit 32c increases the injection speed of the plunger 24. The injection control unit 32c controls the injection driving unit 25 to switch the injection speed of the plunger 24 to the high injection speed VH, thereby performing high-speed injection. The injection speed of the plunger 24 is, for example, 1m/s or more.

In step ST9, the injection controller 32c controls the injection driver 25 to raise and maintain the pressure of the melt M.

Step ST9 is the state at time t3 of fig. 7. Step ST9 is the state of fig. 7 (c). In step ST9, the plunger 24 is stopped.

The above-described steps ST1 to ST9 are performed per casting cycle.

Next, the operation and effect of the die-casting machine according to embodiment 1 will be described.

In a semi-hot chamber type die casting machine, there is a possibility that an impact is applied to a connection portion between a sleeve and a melt supply pipe at the time of plunger injection, and the melt supply pipe is damaged. Therefore, it is desirable to reduce the impact applied to the melt supply pipe at the time of injection of the plunger and to suppress the breakage of the melt supply pipe.

The die-casting machine 100 according to embodiment 1 includes a melt supply pipe 40 that is attachable to and detachable from the melt supply gate 28, and a crane 60 that separates the melt supply pipe 40 from the melt supply gate 28 during sliding of the plunger 24. By detaching the melt supply pipe 40 from the melt supply gate 28, the impact accompanying the injection of the plunger 24 does not act on the melt supply pipe 40. Thus, breakage of the melt supply pipe 40 is suppressed.

The distance (α in fig. 3) between the melt supply gate 28 and the melt supply pipe 40 after the melt supply pipe 40 is detached from the melt supply gate 28 is preferably 1mm to 10 mm. By setting the distance α to 1mm or more, the sleeve 22 is suppressed from hitting the melt supply pipe 40 by the impact accompanying the injection of the plunger 24. Further, by setting the thickness to 10mm or less, the time required for connecting the melt supply gate 28 and the melt supply pipe 40 for the next casting cycle is shortened.

It is preferable that the melt surface position in the melt supply pipe 40 after the melt supply pipe 40 is detached from the melt supply gate 28 is maintained at a relatively high position directly below the melt supply gate 28. This can shorten the melt filling time into the sleeve 22 in the next casting cycle.

The melt supply pipe 40 is preferably formed only of ceramics having high heat resistance. For example, when a metal is used for the melt supply pipe 40, there is a possibility that the metal is melted and damaged by the high-temperature melt. Ceramics are less resistant to impact than metals. However, in the die-casting machine 100 according to embodiment 1, since the melt supply pipe 40 is separated from the sleeve 22, no impact acts on the melt supply pipe 40. Therefore, the melt supply pipe 40 can be formed of only ceramic.

The ceramic melt supply pipe 40 preferably does not have a bent portion from the viewpoint of maintaining strength. The melt supply pipe 40 is preferably a cylindrical shape extending linearly from the viewpoint of maintaining strength.

The die-casting machine 100 according to embodiment 1 includes a melt sensor 26 and a melt level sensor 56. The melt level just before the completion of the melt supply can be detected by the melt sensor 26, and the melt supply speed can be switched from a high speed to a low speed. Further, the melt level sensor 56 can measure the melt level position with high accuracy. Therefore, the melt supply time can be shortened and the melt supply accuracy can be improved.

The melt supply control unit 32b preferably controls the electromagnetic pump 54 so that the filling rate of the melt in the sleeve 22 at the time when the supply of the melt to the sleeve 22 is completed becomes 70% or more, and more preferably controls so that the filling rate becomes 80% or more. The melt supply control unit 32b preferably controls the electromagnetic pump 54 so that the filling rate of the melt in the sleeve 22 becomes 95% or more, and more preferably 98% or more, when the plunger tip 24a reaches the position where the melt supply gate 28 is closed. The entrainment of gas into the melt is reduced, and the quality of the molded product is improved.

In the die-casting machine 100 according to embodiment 1, after the plunger tip 24a reaches the position for closing the melt supply gate 28, the injection controller 32c controls the injection driver 25 to increase the injection speed of the plunger 24. Therefore, the time required for manufacturing the die cast product can be shortened.

As described above, according to embodiment 1, the melt supply pipe 40 that is attachable to and detachable from the melt supply gate 28 and the crane 60 that separates the melt supply pipe 40 from the melt supply gate 28 during sliding of the plunger 24 are provided, and thus it is possible to realize a die-casting machine that can reduce the impact applied to the melt supply pipe 40 at the time of injection of the plunger 24 and suppress damage to the melt supply pipe 40.

(embodiment 2)

The die-casting machine according to embodiment 2 is different from embodiment 1 in that the melt supply pipe is movable relative to the holding furnace, and the moving mechanism moves the melt supply pipe independently of the holding furnace. Hereinafter, a part of the description of the overlapping contents with embodiment 1 will be omitted.

Fig. 8 is a schematic cross-sectional view showing a sleeve, a plunger, and a melt supply device of the die-casting machine according to embodiment 2.

The die-casting machine of embodiment 2 is a semi-hot chamber die-casting machine.

The die-casting machine according to embodiment 2 includes a mold clamping device 10, an extrusion device 12, an injection device 14, a mold 16, a control unit 18, and a melt supply device 20.

The injection device 14 includes a sleeve 22, a plunger 24, an injection drive unit 25, and a position sensor 27. Plunger 24 includes a plunger head 24a and a plunger rod 24 b. The sleeve 22 is provided with a melt sensor 26 (1 st sensor), a melt supply gate 28, and a gas discharge port 30.

The metal mold 16 includes a fixed metal mold 16a and a moving metal mold 16 b.

The control unit 18 comprises a control device 32, an input device 34, a display device 36. The control device 32 includes a molding condition selection unit 32a, a melt supply control unit 32b, an injection control unit 32c, and a separation control unit 32 d.

The melt supply device 20 includes a melt supply pipe 40, a holding furnace 42, a gasket 44, a 1 st heater 46, a melt supply pipe sleeve 50, a 2 nd heater 52, an electromagnetic pump 54 (melt supply driving unit), a melt level sensor 56 (2 nd sensor), a metal feeder 64, a melt supply pipe support member 80, an actuator 82 (moving mechanism), an actuator support member 84, and a slide member 86. The holding furnace 42 is provided with a holding furnace melt level sensor 66, a filter 68, a filter holder 70, a holding furnace heater 72, and a metal supply port 74. The electromagnetic pump 54 has a coil 54a and a core 54 b.

The melt supply pipe 40 is provided below the sleeve 22. The melt supply pipe 40 is detachable from the melt supply port 28 of the sleeve 22. The melt supply pipe 40 is movable relative to the holding furnace 42, for example. The melt supply pipe 40 has a function of supplying the melt into the sleeve 22.

The melt supply pipe support member 80 has a function of supporting the melt supply pipe 40. The melt supply pipe support member 80 supports the melt supply pipe 40 with a flange provided at the upper end of the melt supply pipe 40.

The actuator 82 is an example of a moving mechanism. The actuator 82 has a function of attaching and detaching the melt supply pipe 40 to and from the melt supply gate 28 by moving the melt supply pipe 40 in the vertical direction. The actuator 82 has a function of detaching the melt supply pipe 40 from the melt supply gate 28 during the sliding of the plunger 24.

The actuator 82 is, for example, an air cylinder. The actuator 82 may also be a hydraulic cylinder or a solenoid actuator, for example.

The actuator support member 84 supports the actuator 82.

By operating the actuator 82, the melt supply pipe 40 and the melt supply pipe sleeve 50 are relatively moved in the vertical direction. Further, by operating the actuator 82, the melt supply pipe support member 80 and the actuator support member 84 are relatively moved in the vertical direction.

For example, the actuators 82 are provided in an amount of 3 or more around the melt supply pipe 40 so that the vertical movement of the melt supply pipe 40 is stably performed.

The slide member 86 is provided between the melt supply pipe 40 and the melt supply pipe sleeve 50. The slide member 86 suppresses leakage of the melt from the gap between the melt supply pipe 40 and the melt supply pipe sleeve 50.

The disengagement control unit 32d has a function of controlling the actuator 82 based on the position of the plunger 24 detected by the position sensor 27. For example, after the plunger head 24a closes the melt supply gate 28, the disengagement control section 32d controls the actuator 82 to disengage the melt supply pipe 40 from the melt supply gate 28.

As described above, according to embodiment 2, by providing the melt supply pipe 40 that is attachable to and detachable from the melt supply gate 28 and the actuator 82 that separates the melt supply pipe 40 from the melt supply gate 28 during the sliding of the plunger 24, it is possible to realize a die-casting machine that can reduce the impact applied to the melt supply pipe 40 at the time of injection by the plunger 24 and suppress the breakage of the melt supply pipe 40.

In addition, unlike embodiment 1, embodiment 2 moves only the melt supply pipe 40 up and down. In other words, the holding furnace 42 is fixed. Therefore, embodiment 2 is preferable for a large-sized die-casting machine that requires a heavy holding furnace 42.

(embodiment 3)

The die-casting machine according to embodiment 3 is different from embodiment 1 in that the melt supply driving unit is an air-compression device that increases the air pressure in the holding furnace. Hereinafter, a part of the description of the overlapping contents with embodiment 1 will be omitted.

Fig. 9 is a schematic cross-sectional view showing a sleeve, a plunger, and a melt supply device of the die-casting machine according to embodiment 3.

The die-casting machine of embodiment 3 is a semi-hot chamber die-casting machine.

The die-casting machine according to embodiment 3 includes a mold clamping device 10, an extrusion device 12, an injection device 14, a mold 16, a control unit 18, and a melt supply device 20.

The injection device 14 includes a sleeve 22, a plunger 24, an injection drive unit 25, and a position sensor 27. Plunger 24 includes a plunger head 24a and a plunger rod 24 b. The sleeve 22 is provided with a melt sensor 26 (1 st sensor), a melt supply gate 28, and a gas discharge port 30.

The metal mold 16 includes a fixed metal mold 16a and a moving metal mold 16 b.

The control unit 18 comprises a control device 32, an input device 34, a display device 36. The control device 32 includes a molding condition selection unit 32a, a melt supply control unit 32b, an injection control unit 32c, and a separation control unit 32 d.

The melt supply device 20 includes a melt supply pipe 40, a holding furnace 42, a gasket 44, a 1 st heater 46, a protective member 48, a melt supply pipe sleeve 50, a 2 nd heater 52, an air pressure device 88 (melt supply driving unit), a melt level sensor 56 (a 2 nd sensor), a crane 60 (moving mechanism), and a fulcrum 62. The holding furnace 42 is provided with a holding furnace melt level sensor 66, a filter 68, a filter holder 70, and a holding furnace heater 72.

The air compressor 88 generates a driving force for transferring the melt from the holding furnace 42 to the sleeve 22 through the melt supply pipe 40. The air compressor 88 supplies gas to the sealed holding furnace 42 to pressurize the inside of the holding furnace 42. This applies a pressure higher than atmospheric pressure to the melt surface in the holding furnace 42. The molten metal is filled into the sleeve 22 by this pressure.

The melt supply control unit 32b has a function of controlling the supply of the melt from the holding furnace 42 into the sleeve 22 based on the data of the melt surface position detected by the melt sensor 26 and the melt surface sensor 56. The molten metal is supplied into the sleeve 22 by controlling the driving of the air pressure device 88.

As described above, according to embodiment 3, by providing the melt supply pipe 40 that is attachable to and detachable from the melt supply gate 28 and the crane 60 that separates the melt supply pipe 40 from the melt supply gate 28 during the sliding of the plunger 24, it is possible to realize a die-casting machine that can reduce the impact applied to the melt supply pipe 40 at the time of injection of the plunger 24 and suppress the breakage of the melt supply pipe 40.

(embodiment 4)

The die-casting machine according to embodiment 4 is different from embodiment 3 in that the melt supply pipe is relatively movable with respect to the holding furnace, and the moving mechanism moves the melt supply pipe independently of the holding furnace. Hereinafter, description of the overlapping contents with embodiment 1 and embodiment 3 will be omitted.

Fig. 10 is a schematic cross-sectional view showing a sleeve, a plunger, and a melt supply device of the die-casting machine according to embodiment 4.

The die-casting machine of embodiment 4 is a semi-hot chamber die-casting machine.

The die-casting machine according to embodiment 4 includes a mold clamping device 10, an extrusion device 12, an injection device 14, a mold 16, a control unit 18, and a melt supply device 20.

The injection device 14 includes a sleeve 22, a plunger 24, an injection drive unit 25, and a position sensor 27. Plunger 24 includes a plunger head 24a and a plunger rod 24 b. The sleeve 22 is provided with a melt sensor 26 (1 st sensor), a melt supply gate 28, and a gas discharge port 30.

The metal mold 16 includes a fixed metal mold 16a and a moving metal mold 16 b.

The control unit 18 comprises a control device 32, an input device 34, a display device 36. The control device 32 includes a molding condition selection unit 32a, a melt supply control unit 32b, an injection control unit 32c, and a separation control unit 32 d.

The melt supply device 20 includes a melt supply pipe 40, a holding furnace 42, a gasket 44, a 1 st heater 46, a melt supply pipe sleeve 50, a 2 nd heater 52, an air pressure device 88 (melt supply driving unit), a melt level sensor 56 (2 nd sensor), a melt supply pipe support member 80, an actuator 82 (moving mechanism), an actuator support member 84, and a slide member 86. The holding furnace 42 is provided with a holding furnace melt level sensor 66, a filter 68, a filter holder 70, a holding furnace heater 72, and a metal supply port 74.

The melt supply pipe 40 is provided below the sleeve 22. The melt supply pipe 40 is detachable from the melt supply port 28 of the sleeve 22. The melt supply pipe 40 is movable relative to the holding furnace 42, for example. The melt supply pipe 40 has a function of supplying the melt into the sleeve 22.

The melt supply pipe support member 80 has a function of supporting the melt supply pipe 40. The melt supply pipe support member 80 supports the melt supply pipe 40 with a flange provided at the upper end of the melt supply pipe 40.

The actuator 82 is an example of a moving mechanism. The actuator 82 has a function of attaching and detaching the melt supply pipe 40 to and from the melt supply gate 28 by moving the melt supply pipe 40 in the vertical direction. The actuator 82 has a function of detaching the melt supply pipe 40 from the melt supply gate 28 during the sliding of the plunger 24.

The actuator 82 is, for example, an air cylinder. The actuator 82 may be, for example, a hydraulic cylinder or a solenoid actuator.

The actuator support member 84 supports the actuator 82.

By operating the actuator 82, the melt supply pipe 40 and the melt supply pipe sleeve 50 are relatively moved in the vertical direction. Further, by operating the actuator 82, the melt supply pipe support member 80 and the actuator support member 84 are relatively moved in the vertical direction.

The slide member 86 is provided between the melt supply pipe 40 and the melt supply pipe sleeve 50. The slide member 86 suppresses leakage of the melt from the gap between the melt supply pipe 40 and the melt supply pipe sleeve 50.

The disengagement control unit 32d has a function of controlling the actuator 82 based on the position of the plunger 24 detected by the position sensor 27. For example, after the plunger head 24a closes the melt supply gate 28, the disengagement control section 32d controls the actuator 82 to disengage the melt supply pipe 40 from the melt supply gate 28.

As described above, according to embodiment 4, by providing the melt supply pipe 40 that is attachable to and detachable from the melt supply gate 28 and the actuator 82 that separates the melt supply pipe 40 from the melt supply gate 28 during the sliding of the plunger 24, it is possible to realize a die-casting machine that can reduce the impact applied to the melt supply pipe 40 at the time of injection by the plunger 24 and suppress the breakage of the melt supply pipe 40.

In embodiment 4, unlike embodiment 3, only the melt supply pipe 40 is moved up and down. In other words, the holding furnace 42 is fixed. Therefore, embodiment 4 is preferable for a large-sized die-casting machine that requires a heavy holding furnace 42.

The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In the embodiment, a part of the die-casting machine or the like which is not directly necessary in the description of the present invention is omitted, but necessary elements of the die-casting machine or the like may be appropriately selected and used.

A horizontal movement mechanism that can horizontally move the holding furnace 42 may be provided at a lower portion of the holding furnace 42 according to embodiments 1 to 4. The horizontal movement mechanism is, for example, a wheel. By providing the horizontal movement mechanism, maintenance of the holding furnace 42 becomes easy.

In embodiment 1 or 3, for example, a crane may be provided instead of the support point 62 to move the holding furnace 42 in the vertical direction.

In addition, all the die-casting machines which have the elements of the present invention and which can be appropriately designed and changed by those skilled in the art are included in the scope of the present invention. The scope of the invention is defined by the claims and their equivalents.

Description of the reference symbols

16 metal mould

22 sleeve

24 plunger

24a plunger head

24b plunger rod

25 injection drive part

26 melt sensor (the 1 st sensor)

28 melt supply gate

32b melt supply control part

32c injection control part

32d disengagement control unit

40 molten metal supply pipe

42 holding furnace

54 electromagnetic pump (melt supply drive part)

56 melt level sensor (2 nd sensor)

60 Crane (moving mechanism)

82 actuator (moving mechanism)

88 air compressor (melt supply drive part)

100 die casting machine

M melt

Alpha distance