阅读说明：本技术 一种钛合金管件电流辅助推弯成形装置及工作方法 (Current-assisted push-bend forming device for titanium alloy pipe fitting and working method ) 是由 李鸣 赵欣 王荣祥 靳凯 于 2020-06-24 设计创作，主要内容包括：本发明公开了一种钛合金管件电流辅助推弯成形装置及工作方法,属于管坯的制备领域,本发明通过在机台上方设置有通电装置、滑动装置、以及滑动装置两侧连接的液压装置、推弯主模；推弯主模包括上模具以及下模具；在下模具内部设置有之间型腔,钛合金管坯置于型腔内部,型腔的一侧设有推杆,通过推杆与滑动装置相连；型腔的另一侧弯曲部分连接于连接器,所述的型腔弯曲部分内侧设置有芯棒,芯棒固定在连接器上,芯棒与推弯后工件内部形状相配合；本发明可以对钛合金管材进行电流辅助推弯的推弯装置,可以利用较小的推弯力,实现对尺寸大、屈服强度大的钛合金工件的弯曲成型,通过调整电参数来实现成形精度的控制。(The invention discloses a current-assisted push-bending forming device for a titanium alloy pipe fitting and a working method, belonging to the field of pipe blank preparation.A power-on device, a sliding device, a hydraulic device and a push-bending main die which are connected with the two sides of the sliding device are arranged above a machine table; the bending main die comprises an upper die and a lower die; a middle cavity is arranged in the lower die, the titanium alloy tube blank is arranged in the cavity, and a push rod is arranged on one side of the cavity and is connected with a sliding device through the push rod; the other side of the cavity is connected with a connector, a core rod is arranged on the inner side of the cavity bending part and fixed on the connector, and the core rod is matched with the inner shape of the workpiece after bending; the bending device can perform current-assisted bending pushing on the titanium alloy pipe, can realize bending forming on a titanium alloy workpiece with large size and large yield strength by using smaller bending pushing force, and realizes control on forming precision by adjusting electrical parameters.)

1. A current-assisted bending forming device for a titanium alloy pipe fitting comprises a machine table (1) and is characterized in that a power-on device, a sliding device, a hydraulic device and a bending main die which are connected with the two sides of the sliding device are arranged above the machine table (1);

the sliding device comprises a connecting block (4), and a piston rod (3) and a push rod (6) are respectively connected to two sides of the connecting block (4); the lower side of the connecting block (4) is arranged on the linear rail (5) through a sliding block (16) to control the sliding device to move back and forth;

The push bending main die comprises an upper die (7) and a lower die (8); a middle cavity is arranged in the lower die (8), the titanium alloy tube blank is arranged in the cavity, the diameter of the cavity is equal to that of the titanium alloy tube blank, a push rod (6) is arranged on one side of the cavity and connected with a sliding device through the push rod (6), and the diameter of the push rod (6) is equal to that of the cavity; the other side bending part of the cavity is connected with a connector (10), a core rod (9) is arranged on the inner side of the bending part of the cavity, the core rod (9) is fixed on the connector (10), and the core rod (9) is matched with the inner shape of the workpiece after bending.

2. The titanium alloy pipe fitting current-assisted push-bend forming device according to claim 1, wherein the hydraulic device comprises an oil cylinder (2), the piston rod (3) is connected to the outer side of the oil cylinder (2), and a stroke control device is arranged inside the hydraulic device.

3. The current-assisted push-bend forming device for the titanium alloy pipe fitting as claimed in claim 1, wherein the cavity is internally plated with an insulating layer.

4. The titanium alloy pipe fitting current-assisted push-bend forming device as claimed in claim 1, wherein said energizing means comprises a power source (11), said power source (11) extends out of two wires: a positive electrode lead (12) and a negative electrode lead (13); the tail parts of the positive wire (12) and the negative wire (13) of the wires are respectively connected with a positive wire clamp (14) and a negative wire clamp (15); and electrifying and heating the titanium alloy tube blank by utilizing the positive wire clamp (14) and the negative wire clamp (15).

5. The working method of the current-assisted push-bend forming device for the titanium alloy pipe fitting according to any one of claims 1 to 4, characterized in that the method comprises the following steps:

placing a titanium alloy tube blank into a cavity of a lower die (8), clamping a positive wire clamp (14) and a negative wire clamp (15) on two sides of the titanium alloy tube blank, turning on a power supply (11), adjusting to corresponding electrical parameters, electrifying the titanium alloy tube blank, turning off the power supply after the tube is heated, taking down the positive wire clamp (14) and the negative wire clamp (15), and rotationally closing an upper die (7);

step two, the hydraulic device is opened, the stroke control device controls the push rod (6) to push the titanium alloy tube blank to advance until the push rod (6) is contacted with the core rod (9), and the stroke control device controls the push rod (6) to return;

and step three, rotationally pulling up the upper die (7), pulling up the core rod (9) through the connector (10), discharging and finishing processing.

Technical Field

The invention belongs to the field of pipe blank preparation, relates to push bending equipment for a titanium alloy pipe, and particularly relates to a current-assisted push bending forming device for a titanium alloy pipe fitting and a working method.

Background

Due to the characteristics of high deformation resistance, low elastic modulus and the like of the titanium alloy, the titanium alloy pipe has the defects of low forming precision, large rebound quantity and the like after being processed, and the bent pipe finished product meeting the requirement is difficult to process by the conventional equipment. For example, for titanium alloy pipes with large wall thickness and diameter, the common processing method is to respectively heat and press bend two parts of the pipe and then weld the two parts together for forming. The processing steps are complicated, the adopted working environment is complex, and in addition, the forming is divided into two parts, so the effect is poor in the aspect of controlling the forming precision.

Disclosure of Invention

The invention aims at the problems in the prior art and discloses a bending pushing device which can perform current-assisted bending pushing on a titanium alloy pipe on the basis of a traditional bending pushing machine, can realize bending forming on a titanium alloy workpiece with large size and large yield strength by utilizing smaller bending pushing force, and realizes control on forming precision by adjusting electrical parameters.

The invention is realized by the following steps:

a current-assisted bending forming device for a titanium alloy pipe fitting comprises a machine table and is characterized in that a power-on device, a sliding device, a hydraulic device and a bending main die, wherein the hydraulic device and the bending main die are connected with two sides of the sliding device; the sliding device comprises a connecting block, and a piston rod and a push rod are respectively connected to two sides of the connecting block; the lower side of the connecting block is arranged on the linear rail through a sliding block to control the sliding device to move back and forth;

The push bending main die comprises an upper die and a lower die; a middle cavity is arranged in the lower die, the titanium alloy tube blank is arranged in the cavity, the diameter of the cavity is equal to that of the titanium alloy tube blank, a push rod is arranged on one side of the cavity and connected with a sliding device through the push rod, and the diameter of the push rod is equal to that of the cavity; the other side bending part of the cavity is connected with the connector, a core rod is arranged on the inner side of the bending part of the cavity and fixed on the connector, and the core rod is matched with the inner shape of the workpiece after bending.

Further, the hydraulic device comprises an oil cylinder, the piston rod is connected to the outer side of the oil cylinder, and a stroke control device is arranged in the hydraulic device.

Furthermore, an insulating layer is electroplated inside the cavity.

Further, the power-on device comprises a power supply, and the power supply extends out of two wires: a positive electrode lead and a negative electrode lead; the tail parts of the positive wire and the negative wire of the lead are respectively connected with a positive wire clamp and a negative wire clamp; and electrifying and heating the titanium alloy tube blank by using the positive wire clamp and the negative wire clamp.

The invention also discloses a working method of the current-assisted push-bend forming device for the titanium alloy pipe fitting, which is characterized by comprising the following steps:

Placing a titanium alloy tube blank into a cavity of a lower die, clamping a positive wire clamp and a negative wire clamp on two sides of the titanium alloy tube blank, turning on a power supply, adjusting to corresponding electrical parameters, electrifying the titanium alloy tube blank, turning off the power supply after heating the tube, taking down the positive wire clamp and the negative wire clamp, and rotationally closing the upper die;

step two, the hydraulic device is opened, the stroke control device controls the push rod to push the titanium alloy tube blank to move forward until the push rod is contacted with the core rod, and the stroke control device controls the push rod to move back;

and step three, rotationally pulling up the upper die, pulling up the core rod through the connector, unloading and finishing the machining.

Compared with the prior art, the invention has the beneficial effects that:

the device can utilize smaller bending force, namely the push rod, under the pushing of the sliding device and the electrification heating of the electrifying device, the titanium alloy tube blank in the titanium alloy tube blank cavity is processed and formed, and the bending forming of a titanium alloy workpiece with large size and large yield strength is realized;

the equipment can effectively improve the processing precision by accurately controlling the sliding device through the stroke control device; the mechanical property of the material can be obviously improved by utilizing the electro-plastic effect when the power is switched on before processing, and the resilience precision is controlled; compared with the traditional hot processing push bending, the equipment can reduce the cost problem and the working environment problem caused by heating equipment, and can also realize the control of the forming precision by adjusting the electrical parameters very conveniently.

Drawings

FIG. 1 is a schematic top view of a current-assisted push-bend forming apparatus for titanium alloy pipe fittings according to the present invention;

fig. 2 is a schematic structural view of a current-assisted push-bend forming device for a titanium alloy pipe fitting according to the present invention.

The device comprises a machine table 1, an oil cylinder 2, a piston rod 3, a connecting block 4, a wire rail 5, a push rod 6, an upper die 7, a lower die 8, a core rod 9, a connector 10, a power supply 11, a positive lead 12, a negative lead 13, a positive wire clamp 14, a negative wire clamp 15 and a sliding block 16.

Detailed Description

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1-2, the current-assisted bending forming device for titanium alloy pipe fittings of the present invention includes a machine table 1, and an energizing device, a sliding device, and a hydraulic device and a bending main die connected to two sides of the sliding device are disposed above the machine table 1. Specifically, the method comprises the following steps: a sliding device is arranged on the machine table 1 at a position opposite to the bending main die, the other side of the sliding device is connected with a hydraulic device, and a power-on device is arranged on the side surface of the sliding device. The bending main die comprises an upper die 7 and a lower die 8, a cavity with the diameter equal to that of the titanium alloy tube blank is arranged inside the lower die 8, a push rod 6 with the diameter equal to that of the cavity is arranged on one side of the cavity, one side of the push rod 6 is connected with a sliding device, an insulating layer is electroplated inside the cavity, a core rod 9 fixed on a connector 10 is arranged inside a bent part of the cavity, and the core rod 9 is matched with the inner shape of a workpiece after bending; the upper side of a connecting block 4 of the sliding device is connected with a push rod 6, one side of the connecting block is connected with a piston rod 3, a sliding block 16 is arranged at the lower side of the connecting block, and the sliding block 16 is arranged on a linear rail 5 and can move back and forth; two leads 12 and 13 extend out of a power supply 11 of the electrifying device, and the tail parts of the leads 12 and 13 are connected with metal wire clamps 14 and 15; the hydraulic device is internally provided with a stroke control device.

The working method of the current-assisted push-bend forming device for the titanium alloy pipe fitting comprises the following steps:

firstly, a titanium alloy tube blank is placed in a cavity of a lower die 8, a positive wire clamp 14 and a negative wire clamp 15 are clamped on two sides of the titanium alloy tube blank, a power supply 11 is turned on, corresponding electrical parameters are adjusted, the titanium alloy tube blank is electrified, the power supply is turned off after the tube is heated, the positive wire clamp 14 and the negative wire clamp 15 are taken down, and the upper die is closed in a rotating mode.

And secondly, opening the hydraulic device, controlling the push rod 6 to push the titanium alloy pipe to advance by the stroke control device until the push rod 6 is contacted with the core rod 9, and controlling the push rod 6 to retract by the stroke control device.

And thirdly, rotatably pulling up the upper die 8, pulling up the core rod 9 through the connector 10, discharging and finishing the processing.

The foregoing examples are merely illustrative of the principles of the present invention and its efficacy, and are not to be construed as limiting the invention.