阅读说明：本技术 一种真空压铸模具的密封结构 (Sealing structure of vacuum die-casting die ) 是由 王雷 费业龙 丁爱生 于 2019-11-29 设计创作，主要内容包括：本发明涉及真空压铸技术领域,具体涉及一种真空压铸模具的密封结构,模具包括从后到前依次设置的后模框、后模仁、前模仁和前模框,后模仁和前模仁之间设置有用于成型产品的型腔,上模仁开设有位于型腔外周侧的上闭环沟槽,下模仁开设有位于型腔外周侧的下闭环沟槽；在合模状态下,上闭环沟槽与下闭环沟槽对准闭合以形成闭环通道,闭环通道内容置有闭环密封圈；与现有技术相比,模具合模后,闭环密封槽将整个型腔包围并密封,减少漏气气源数量,简化模具体积,不需外设其它密封单元,显著提高模具整体密封性能,本申请的密封结构适用于各种采用真空压铸工艺的模具,具有结构简单,使用方便,可有效提高真空压铸产品质量的特点。(The invention relates to the technical field of vacuum die casting, in particular to a sealing structure of a vacuum die casting die, which comprises a rear die frame, a rear die core, a front die core and a front die frame which are sequentially arranged from back to front, wherein a die cavity for forming a product is arranged between the rear die core and the front die core, the upper die core is provided with an upper closed-loop groove positioned on the peripheral side of the die cavity, and the lower die core is provided with a lower closed-loop groove positioned on the peripheral side of the die cavity; in a die assembly state, the upper closed-loop groove and the lower closed-loop groove are aligned and closed to form a closed-loop channel, and a closed-loop sealing ring is arranged in the closed-loop channel; compared with the prior art, after the die is closed, the closed-loop sealing groove surrounds and seals the whole cavity, the quantity of air sources with air leakage is reduced, the size of the die is simplified, other sealing units are not needed to be arranged outside, and the integral sealing performance of the die is obviously improved.)

1. The utility model provides a seal structure of vacuum die casting die which characterized in that: the die comprises a rear die frame, a rear die core, a front die core and a front die frame which are sequentially arranged from back to front, wherein a die cavity for forming a product is arranged between the rear die core and the front die core, the upper die core is provided with an upper closed-loop groove positioned on the peripheral side of the die cavity, and the lower die core is provided with a lower closed-loop groove positioned on the peripheral side of the die cavity;

in a matched die state, the upper closed-loop groove and the lower closed-loop groove are aligned and closed to form a closed-loop channel, and a closed-loop sealing ring is arranged in the closed-loop channel;

the mould still includes the thimble mechanism that is used for taking off the material, and thimble mechanism includes the thimble, the thimble hole that supplies the thimble to pass is all seted up to back framed and back mould benevolence, under the assembled state, the thimble inserts in the thimble hole, be provided with thimble seal assembly between thimble and the thimble hole.

2. A sealing structure of a vacuum die casting mold according to claim 1, characterized in that: the front die core is fixedly arranged inside the front die frame, the front die frame is provided with a casting opening, the front die core is provided with an upper hot runner communicated with the die cavity, and one end part of the casting opening is communicated with the upper hot runner.

3. A sealing structure of a vacuum die casting mold according to claim 2, characterized in that: the casting opening is arranged in a shape of a counter bore and comprises a columnar part and a counter bore part; the inner wall of the columnar part and the inner part of the countersunk head part are both provided with internal thread sections, the columnar part is internally engaged with a water jacket, a T-shaped material pipe is arranged in the water jacket, the longitudinal section of the T-shaped material pipe is inserted into the water jacket and fixed, and the transverse section of the T-shaped material pipe is engaged with the inner wall of the countersunk head part of the casting opening; the bottom end face of the water jacket is provided with a first groove, the top end face of the front mold core is provided with a second groove, in an assembly state, the first groove and the second groove are aligned and jointly enclose a first sealing channel, and a first sealing ring is arranged in the first sealing channel.

4. A sealing structure of a vacuum die casting mold according to claim 2, characterized in that: the sprue structure is characterized in that a sprue spreader is arranged below the sprue gate, the sprue spreader is fixedly connected with the rear mold core, a third groove is formed in the bottom end face of the sprue spreader, a fourth groove is formed in the top end face of the rear mold core, the third groove and the fourth groove are aligned and jointly enclose a second sealing channel in an assembling state, and a second sealing ring is arranged in the second sealing channel.

5. A sealing structure of a vacuum die casting mold according to claim 3, characterized in that: the feed inlet department intercommunication of T type material pipe is provided with the die casting machine sleeve and sets up the plunger head in the quick die casting machine sleeve of searching.

6. A sealing structure of a vacuum die casting mold according to claim 1, characterized in that: the thimble sealing assembly comprises a third sealing ring and a fourth sealing ring, at least one first annular groove is formed in the thimble along the axial direction of the thimble, the third sealing ring is sleeved in the first annular groove, at least one second annular groove is formed in the inner wall of the thimble hole along the axial direction of the thimble hole, and the fourth sealing ring is clamped in the second annular groove.

7. A sealing structure of a vacuum die casting mold according to claim 6, characterized in that: the thimble mechanism still includes thimble board and thimble push pedal, the one side that back mould benevolence was kept away from to the thimble board is provided with the thimble push pedal, thimble push pedal and thimble board fixed connection, the thimble board is close to one side of thimble push pedal sets up the counter bore that a plurality of intervals set up, and under the assembled state, the head card of thimble is held in the counter bore.

8. A sealing structure of a vacuum die casting mold according to claim 6, characterized in that: the thimble is seted up three first annular groove along its axial, and three first annular groove interval sets up.

9. A sealing structure of a vacuum die casting mold according to claim 6, characterized in that: and a second annular groove is formed in the inner wall of the thimble hole, and the fourth sealing ring and the third sealing ring are sequentially arranged in the thimble hole from back to front in the state that the thimble props against a product.

10. A sealing structure of a vacuum die casting mold according to claim 6, characterized in that: the structure of the third sealing ring and the structure of the fourth sealing ring are the same.

Technical Field

The invention relates to the technical field of vacuum die casting, in particular to a sealing structure of a vacuum die casting die.

Background

The existing die-casting products often suffer from a series of problems of more air holes, poorer mechanical properties, poor appearance quality and the like in the production process, and in order to improve the quality and the performance of the die-casting products, the mainstream method is to use vacuum die-casting.

The vacuum die casting refers to a process for removing most of gas in a die cavity and an injection material pipe of a die after the die is closed and before the metal solution is injected, so that a near-vacuum die casting environment is formed inside the whole die, and air holes and dissolved gas inside a metal die casting product in the injection and pressure maintaining stages are obviously reduced, thereby improving the mechanical property and the surface quality of the metal die casting product.

In the field of vacuum die-casting dies, the invention patent with the application number of 200910241258.X discloses a sealing structure of the vacuum die-casting die, and as shown in fig. 1, the sealing structure of the vacuum die-casting die comprises a movable die 1, a static die 2, a push rod fixing plate 4, a push rod 5, a back plate 6, a sealing flange 7, a back plate sealing groove 8, a flange sealing ring 9, a flat plate type sealing interlayer 10, a vacuum exhaust system 11, a vacuum sensor 12 and a parting surface sealing groove 13. In order to seal the cavity, the movable die 1 and the static die 2 are provided with a parting surface sealing groove 13, and in order to avoid the influence of the gap existing between the push rod mechanisms on the vacuum degree of the cavity, the back plate 6 and the movable die 1 form a back plate sealing groove 8, and the push rod holes of the push rod 5, the sealing flange 7 and the back plate 6 are contacted form a flange sealing ring 9. In practical application, the parting surface sealing groove 13, the back plate sealing groove 8 and the flange sealing ring 9 are not sealed tightly enough, so that air enters a cavity, and the production quality of a product is affected.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a sealing structure of a vacuum die-casting die with a good sealing effect.

The purpose of the invention is realized by the following technical scheme: the application provides a sealing structure of a vacuum die-casting die, the die comprises a rear die frame, a rear die core, a front die core and a front die frame which are sequentially arranged from back to front, a die cavity for forming a product is arranged between the rear die core and the front die core, the upper die core is provided with an upper closed-loop groove positioned on the periphery side of the die cavity, and the lower die core is provided with a lower closed-loop groove positioned on the periphery side of the die cavity; in a die assembly state, the upper closed-loop groove and the lower closed-loop groove are aligned and closed to form a closed-loop channel, and a closed-loop sealing ring is arranged in the closed-loop channel; the mould still includes the thimble mechanism that is used for taking off the material, and thimble mechanism includes the thimble, and the thimble hole that supplies the thimble to pass is all seted up to back framed and back mould benevolence, and under the assembled state, the thimble inserts in the thimble hole, is provided with thimble seal assembly between thimble and the thimble hole.

The front die core is fixedly arranged inside the front die frame, the front die frame is provided with a casting opening, the front die core is provided with an upper hot runner communicated with the cavity, and one end part of the casting opening is communicated with the upper hot runner.

The casting opening is arranged in a shape of a countersunk hole and comprises a columnar part and a countersunk part; the inner wall of the columnar part and the inner part of the countersunk head part are both provided with internal thread sections, the columnar part is internally engaged with a water jacket, a T-shaped material pipe is arranged in the water jacket, the longitudinal section of the T-shaped material pipe is inserted into the water jacket and fixed, and the transverse section of the T-shaped material pipe is engaged with the inner wall of the countersunk head part of the casting opening; the bottom end face of the water jacket is provided with a first groove, the top end face of the front mold core is provided with a second groove, the first groove and the second groove are aligned and jointly enclose a first sealing channel in an assembling state, and a first sealing ring is arranged in the first sealing channel.

The sprue gate structure comprises a sprue gate, a sprue core, a sprue gate, a rear die core, a sprue gate.

Wherein, the feed inlet department intercommunication of T type material pipe is provided with the die casting machine sleeve and sets up the plunger head in searching the die casting machine sleeve fast.

The thimble sealing assembly comprises a third sealing ring and a fourth sealing ring, the thimble is provided with at least one first annular groove along the axial direction of the thimble, the third sealing ring is sleeved in the first annular groove, the inner wall of the thimble hole is provided with at least one second annular groove along the axial direction of the thimble hole, and the fourth sealing ring is clamped in the second annular groove.

Wherein, thimble mechanism still includes thimble board and thimble push pedal, and the one side that back mould benevolence was kept away from to the thimble board is provided with the thimble push pedal, and a plurality of counter bores that the interval set up are seted up to thimble push pedal and thimble board fixed connection, and one side that the thimble board is close to the thimble push pedal, and under the assembled state, the head card of thimble is held in the counter bore.

Wherein, three first annular grooves are seted up along its axial to the thimble, and three first annular grooves interval sets up.

The inner wall of the thimble hole is provided with a second annular groove, and the fourth sealing ring and the third sealing ring are sequentially arranged in the thimble hole from back to front in the state that the thimble props against a product.

Wherein, the structure of the third sealing ring and the structure of the fourth sealing ring are the same.

The invention has the beneficial effects that: the utility model provides a seal structure of vacuum die casting die, compared with the prior art, through set up closed loop slot and closed loop slot down respectively at front mould benevolence and back mould benevolence, it is filled with sealing material to go up closed loop slot and closed loop slot closed loop seal groove that closed loop slot encloses jointly down, the mode of unilateral and filling sealing material in the past has been replaced, thereby better solution the not enough problem of vacuum die casting die leakproofness, behind the mould compound die, closed loop seal groove surrounds and seals whole die cavity, reduce gas leakage air supply quantity, simplify the mould volume, do not need other seal unit of peripheral hardware, show improvement mould overall sealing performance, greatly reduced mould cost and manual assembly are consuming time, the seal structure of this application is applicable to various moulds that adopt vacuum die casting technology, and is simple in structure, high durability and convenient use, can effectively improve the characteristics of vacuum die casting product quality.

Drawings

The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.

Fig. 1 is a sealing structure of a vacuum die casting mold in the prior art.

Fig. 2 is a schematic structural view of the sealing structure of the present embodiment.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Fig. 4 is an enlarged view at B in fig. 2.

FIG. 5 is a bottom view of the front mold core of the present embodiment.

Reference numerals: the die comprises a movable die 1, a stationary die 2, a push rod fixing plate 4, a push rod 5, a back plate 6, a sealing flange 7, a back plate sealing groove 8, a flange sealing ring 9, a flat plate type sealing interlayer 10, a vacuum exhaust system 11, a vacuum sensor 12, a parting surface sealing groove 13, a front die frame 21, a front die core 22, a rear die core 23, a rear die frame 24, an ejector plate 25, an ejector plate push plate 26, an ejector 27, a die casting machine sleeve 28, a T-shaped material pipe 29, a plunger head 30, a water jacket 31, a spreader 32, an upper closed-loop groove 41, a lower closed-loop groove 42, a closed-loop sealing ring 43, a first groove 44, a second groove 45, a first sealing ring 46, a third groove 47, a fourth groove 48, a second sealing ring 49, a closed-loop channel 201, a casting opening 202, a first annular groove 81, a second annular groove 82, a.

Detailed Description

The invention is further described with reference to the following examples.

In the sealing structure of the vacuum die-casting mold according to the embodiment of the present invention, as shown in fig. 2 to 5, the mold includes a rear mold frame 24, a rear mold core 23, a front mold core 22 and a front mold frame 21, which are sequentially disposed from the rear to the front, and a cavity for molding a product is disposed between the rear mold core 23 and the front mold core 22. The rear mold frame 24 and the rear mold core 23 and the front mold core 22 and the front mold frame 21 are fixedly connected through bolts.

As an improvement, in order to enhance the sealing strength of the parting surface between the front mold core 22 and the rear mold core 23, the upper mold core is provided with an upper closed-loop groove 41 located on the outer peripheral side of the cavity, and the lower mold core is provided with a lower closed-loop groove 42 located on the outer peripheral side of the cavity. In the clamped state, the upper closed-loop groove 41 and the lower closed-loop groove 42 are aligned and closed to form a closed-loop channel 201, and a closed-loop sealing ring 43 is accommodated in the closed-loop channel 201.

As a further improvement, in order to enhance the sealing properties at the pouring opening 202. The front mold core 22 is fixedly installed inside the front mold frame 21, the front mold frame 21 is provided with a casting opening 202, the front mold core 22 is provided with an upper hot runner communicated with the mold cavity, and one end part of the casting opening 202 is communicated with the upper hot runner. The casting opening 202 is arranged in a shape of a counter bore, and the casting opening 202 comprises a columnar part and a counter bore part; internal thread sections are arranged on the inner wall of the columnar portion and the inner portion of the countersunk portion, a water jacket 31 is arranged in the columnar portion in an engaged mode, a T-shaped material pipe 29 is arranged in the water jacket 31, the longitudinal section of the T-shaped material pipe 29 is inserted into the water jacket 31 and fixed, and the transverse section of the T-shaped material pipe 29 is meshed with the inner wall of the countersunk portion of the casting opening 202; the bottom end surface of the water jacket 31 is provided with a first groove 44, the top end surface of the front mold core 22 is provided with a second groove 45, in an assembly state, the first groove 44 and the second groove 45 are aligned and jointly enclose a first sealing channel, and a first sealing ring 46 is arranged in the first sealing channel.

In this embodiment, a sprue spreader 32 is disposed below the sprue gate 202, the sprue spreader 32 is fixedly connected to the rear mold core 23, a third groove 47 is formed in a bottom end surface of the sprue spreader 32, a fourth groove 48 is formed in a top end surface of the rear mold core 23, in an assembled state, the third groove 47 and the fourth groove 48 are aligned and jointly form a second sealing channel, and a second sealing ring 49 is disposed in the second sealing channel. The feeding port of the T-shaped material pipe 29 is communicated with a die casting machine sleeve 28 and a plunger head 30 arranged in the die casting machine sleeve 28.

Compared with the prior art, the sealing structure of the vacuum die-casting mold of the embodiment has the advantages that the upper closed-loop groove 41 and the lower closed-loop groove 42 are respectively arranged on the front mold core 22 and the rear mold core 23, the closed-loop sealing groove enclosed by the upper closed-loop groove 41 and the lower closed-loop groove 42 is filled with the sealing material, the conventional mode of filling the sealing material on one side is replaced, thereby better solving the problem of insufficient sealing performance of the vacuum die-casting die, after the die is closed, the closed-loop sealing groove surrounds and seals the whole die cavity, reducing the quantity of air sources leaking gas, simplifying the die volume, needing no other sealing units, obviously improving the overall sealing performance of the die, greatly reducing the die cost and the time consumed by manual assembly, the sealing structure is suitable for various dies adopting vacuum die-casting technology, and has the characteristics of simple structure, convenience in use and capability of effectively improving the quality of vacuum die-casting products. It should be noted that the sealing between the splitter cone 32 and the rear core 23 and the sealing between the water jacket 31 and the front core 22 achieve the same effect as the above sealing between the front core 22 and the rear core 23.

In this embodiment, the mold further includes an ejector pin mechanism for stripping material, the ejector pin mechanism includes an ejector pin 27, both the rear mold frame 24 and the rear mold core 23 are provided with an ejector pin hole for the ejector pin 27 to pass through, in an assembled state, the ejector pin 27 is inserted into the ejector pin hole, and an ejector pin sealing assembly is disposed between the ejector pin 27 and the ejector pin hole. The thimble sealing assembly comprises an ejector plate 25, a thimble ejector plate 26, a third sealing ring 83 and a fourth sealing ring 84, the thimble 27 is provided with at least one first annular groove 81 along the axial direction thereof, the third sealing ring 83 is sleeved in the first annular groove 81, the inner wall of the thimble hole is provided with at least one second annular groove 82 along the axial direction of the thimble hole, and the fourth sealing ring 84 is clamped in the second annular groove 82.

In this embodiment, one side of the ejector plate 25, which is far away from the rear mold, is provided with an ejector push plate 26, the ejector push plate 26 is fixedly connected with the ejector plate 25, one side of the ejector plate 25, which is close to the ejector push plate 26, is provided with a plurality of counter bores arranged at intervals, and in an assembly state, the head of the ejector 27 is clamped in the counter bores. This structure is convenient to the dismouting of thimble 27, and is easy and simple to handle, firm in connection.

Preferably, the thimble 27 is provided with three first annular grooves 81 along the axial direction thereof, the three first annular grooves 81 are arranged at intervals, and the three first annular grooves 81 are provided with the third sealing rings 83, so that the sealing strength between the thimble 27 and the thimble hole is further improved.

In this embodiment, the inner wall of the thimble hole is provided with a second annular groove 82, and in a state that the thimble 27 abuts against a product, the fourth sealing ring 84 and the third sealing ring 83 are sequentially arranged in the thimble hole from back to front, and the fourth sealing ring 84 located at the outermost side not only can play a role of self-sealing, but also can play a role of limiting, and can prevent the thimble 27 from falling off.

In the present embodiment, in order to simplify the manufacturing method and simplify the sealing structure, the structure of the third seal 83 and the structure of the fourth seal 84 are the same.

Compared with the prior art, the thimble sealing assembly of the embodiment has the advantages that the second annular groove 82 located on the inner wall of the thimble hole and the first annular groove 81 located on the outer peripheral side of the thimble 27 are arranged in the thimble hole, and the sealing rings are arranged in the annular grooves, so that a multi-layer and staggered sealing structure is formed, the sealing strength between the thimble 27 and the thimble hole is ensured, the vacuum degree in the cavity is improved, and the production quality of products is improved.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.