CN211679943U

CN211679943U - Vacuum die-casting die sealing structure

Info

Publication number: CN211679943U
Application number: CN201922261050.6U
Authority: CN
Inventors: 曾云波; 宗笑; 韩洁丽; 蒋煜
Original assignee: Chongqing Changan Automobile Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-10-16
Anticipated expiration: 2029-12-17

Abstract

The utility model discloses a vacuum die-casting die sealing structure, which comprises a movable die, a fixed die and a push rod, wherein a die cavity is formed between the movable die and the fixed die; the movable die is provided with an open slot with a downward opening, the movable die is provided with a through hole with the lower end communicated with the open slot, the upper end of the through hole is communicated with the die cavity, the central axis of the through hole is coincided with the central axis of the open slot, the push rod sequentially penetrates through the open slot and the through hole, and a sealing adjusting structure is arranged in the open slot; the seal adjusting structure comprises an elastic sealing sleeve and a nut used for pressing the elastic sealing sleeve upwards, the elastic sealing sleeve is in interference fit with the push rod, the upper end of the elastic sealing sleeve supports against the bottom wall of the open slot, the nut is sleeved on the periphery of the push rod, the nut is provided with external threads and is in threaded connection with the inner side wall of the open slot, the upper end of the center hole of the nut is provided with a conical opening with the diameter gradually increased from bottom to top, and the elastic sealing sleeve is provided with a lower conical portion matched with the conical opening. The sealing structure has better sealing effect and longer service life.

Description

Vacuum die-casting die sealing structure

Technical Field

The utility model relates to a vacuum die casting die seals technical field, especially relates to a vacuum die casting die seal structure.

Background

Along with the technical requirements of die-casting products on the vacuum degree of a die-casting die cavity, the vacuum degree of the die-casting die cavity of a part of automobile structural part particularly reaches below 50mbar, and therefore great challenges are brought to the sealing technology of the die-casting die. The key point of the high-vacuum die-casting die sealing is the sealing of a die cavity parting surface and the sealing between the movable die and the push rod, wherein the push rod needs to do periodic reciprocating movement in a push rod hole of the movable die, and in order to avoid the clamping of the push rod, a small gap is required to be left between the push rod and the push rod hole, and the small gap becomes the most easy air leakage part of the vacuum die-casting die in a high-vacuum state. The parting surface of the existing vacuum die-casting die is generally sealed by a single-layer sealing strip, and a push rod and a top pinhole of a movable die are generally sealed by a sealing sleeve or an O-shaped sealing ring. For example, the chinese patent application with the publication number CN204413098U discloses a vacuum die-casting mold sealing structure, in which a moving mold insert of the structure is provided with a push rod capable of moving up and down in a reciprocating manner, a gap is left between the push rod and the moving mold insert, a sealing sleeve for sealing the gap is sleeved outside the push rod, at least two sealing rings are sequentially arranged on a contact surface between the sealing sleeve and the moving mold insert at intervals, peripheral contact surfaces between the fixed mold insert and the moving mold insert are inclined surfaces which are matched with each other, and a sealing rubber strip is arranged at the peripheral edge of the moving mold insert. The parting surface of the vacuum die-casting mold with the structure adopts single-layer sealing, and the sealing strip is easy to cause poor sealing effect due to the burning damage or abrasion of aluminum liquid; the push rod and the push rod hole of the movable mold are generally sealed through interference fit by a metal sealing sleeve or an O-shaped sealing ring, the metal sealing sleeve or the O-shaped sealing ring is placed in the push rod hole of the movable mold insert, the sealing effect is poor due to abrasion of the sealing sleeve or the O-shaped sealing ring after the movable mold insert is operated for a period of time, the movable mold insert and the movable mold frame need to be separated during disassembly and assembly, the working procedure time is long, and the production efficiency is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a sealed effect is better, the longer vacuum die casting die seal structure of life.

In order to achieve the purpose, the utility model provides a vacuum die-casting die sealing structure, which comprises a movable die, a fixed die and a push rod, wherein a die cavity is formed between the movable die and the fixed die; the movable die is provided with an open slot with a downward opening, the movable die is provided with a through hole with the lower end communicated with the open slot, the upper end of the through hole is communicated with the die cavity, the central axis of the through hole is coincided with the central axis of the open slot, the push rod sequentially penetrates through the open slot and the through hole, and a sealing adjusting structure is arranged in the open slot;

the seal adjusting structure comprises an elastic sealing sleeve and a nut used for upwards compressing the elastic sealing sleeve, the elastic sealing sleeve is in interference fit with the push rod, the upper end of the elastic sealing sleeve is abutted to the bottom wall of the open slot, the nut is sleeved on the periphery of the push rod, the nut is provided with external threads and is in threaded connection with the inner side wall of the open slot, the upper end of the center hole of the nut is provided with a cone-shaped opening with the diameter gradually increased from bottom to top, the elastic sealing sleeve is provided with a lower cone-shaped portion matched with the cone-shaped opening, and the cone-shaped opening is upwards compressed.

Furthermore, an elastic opening is arranged on the elastic sealing sleeve.

Furthermore, the upper end of the central hole of the elastic sealing sleeve is concavely provided with an annular step groove, a sealing ring is assembled in the annular step groove, the sealing ring is in interference fit with the push rod, and the sealing ring abuts against the bottom wall of the open groove.

Furthermore, the upper end part of the elastic sealing sleeve is an upper conical part with the diameter gradually reduced from bottom to top, a groove for embedding the upper conical part is formed in the bottom wall of the open slot, and the side wall of the groove is matched with the upper conical part.

Further, the nut is an inner hexagonal nut.

Further, the cover half includes the cover half and inserts, the movable mould includes the movable mould and inserts, the cover half is inserted and is set up on the cover half, the movable mould is inserted and is set up on the movable mould, the cover half with movable mould laminating department forms the cover half die joint, the cover half die joint has set gradually inlayer sealing strip and outer sealing strip from inside to outside.

Further, the inner layer sealing strip is arranged at the interface of the fixed die and the fixed die insert, and the outer layer sealing strip is arranged in the middle of the peripheral parting surface of the fixed die.

Further, the sealing ring is an O-shaped sealing ring.

Compared with the prior art, the utility model has the following advantage:

the utility model discloses a vacuum die casting die seal structure, simple structure, through the cooperation of the lower cone portion of elastic sealing cover and the bell mouth of nut, and adjust with the nut, can make the sealed effect between push rod and the movable mould better, improved the life of elastic sealing cover, reduced the maintenance cost; meanwhile, the nut is arranged at the open slot, so that the disassembly and the assembly are convenient; the upper conical part of the elastic sealing sleeve is matched with the groove of the movable mould, so that the contraction performance of the elastic sealing sleeve is further improved, the sealing performance is improved, and the trial service life of the elastic sealing sleeve is prolonged; the lower conical part of the elastic sealing sleeve is combined with the elastic opening of the elastic sealing sleeve and the design of the sealing ring, so that the service lives of the elastic sealing sleeve and the sealing ring are greatly prolonged; the mould die joint adopts the interior division of double-deck sealing strip to seal and can greatly improve the leakproofness of mould die joint, reduces the sealed local position of individual layer damage and sealed probability that the effect became invalid promptly, has prolonged the mould maintenance cycle.

Drawings

Fig. 1 is a schematic structural view of a sealing structure of a vacuum die-casting mold according to the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is a schematic structural diagram of the connection of the push rod, the nut, the elastic sealing sleeve and the sealing ring in fig. 1.

In the figure:

1-a movable die, 1 a-a through hole and 1 b-an open slot; 2-moving die insert; 3-a push rod; 4-pushing the plate; 5-moving the die base plate; 6-cushion block; 7-moving a fixed mold parting surface; 8-fixing the mold; 9-fixing the die insert; 10-a mould cavity; 11-inner layer sealing strip; 12-outer layer sealing strip; 13-a nut; 14-external threads; 15-elastic sealing sleeve, 151-annular step, 152-elastic opening; 16-a sealing ring; 17-an upper cone; 18-lower taper.

Detailed Description

The structural features of the components of the present invention will be described in detail below, and if directions (up, down, left, right, front, and rear) are described, the structure shown in fig. 1 is used as a reference for description, but the practical use direction of the present invention is not limited thereto. The following describes the present invention with reference to the accompanying drawings.

Referring to fig. 1 to 3, the embodiment discloses a sealing structure of a vacuum die-casting mold, which comprises a movable mold 1, a fixed mold 8 and a push rod 3, wherein a mold cavity 10 is formed between the movable mold and the fixed mold; an open slot 1b with a downward opening is formed in the movable die 1, a through hole 1a with a lower end communicated with the open slot 1b is formed in the movable die 1, the upper end of the through hole 1a is communicated with the die cavity 10, the central axis of the through hole 1a is coincided with the central axis of the open slot 1b, the push rod 3 sequentially penetrates through the open slot 1b and the through hole 1a, and a sealing adjusting structure is arranged in the open slot 1 b.

The seal adjusting structure comprises an elastic sealing sleeve 15 and a nut 13 used for upwards compressing the elastic sealing sleeve 15, the elastic sealing sleeve 15 is in interference fit with the push rod 3, the upper end of the elastic sealing sleeve 15 is abutted to the bottom wall of the open slot 1b, the nut 13 is sleeved on the periphery of the push rod 3, the nut 13 is provided with an external thread 14 and is in threaded connection with the inner side wall of the open slot 1b, the upper end part of the central hole of the nut 13 is provided with a conical opening with the diameter gradually increased from bottom to top, the elastic sealing sleeve 15 is provided with a lower conical part 18 matched with the conical opening, and the conical opening upwards. The sealing ring is made of wear-resistant sealing materials, and in other embodiments, the sealing ring can be made of other types of materials; the elastic sealing sleeve 15 is made of a soft metal material, and in other embodiments, other types of materials can be used.

The conical mouth of the nut 13 cooperates with a lower conical portion 18 of the elastic sealing sleeve 15 to guide the nut 13 and to press the elastic sealing sleeve 15 upwards through the nut 13. The elastic sealing sleeve 15 is arranged to seal the push rod 3 and the gap between the contact surfaces of the movable mould 1 and the elastic sealing sleeve 15. The elastic sealing sleeve 15 is guided, pressed and fixed upwards by the nut 13. When the sealing effect is poor after the elastic sealing sleeve 15 is worn, the elastic sealing sleeve 15 is contracted and resealed by screwing the nut 13, the die does not need to be removed for replacement, and the service life is longer.

In this embodiment, still include push pedal 4, cushion 6 and movable mould bedplate 5, push pedal 4 is fixed to be set up at the lower extreme of push rod 3, and cushion 6 is fixed to be set up between movable mould 1 and movable mould bedplate 5.

As shown in fig. 3, the elastic sealing sleeve 15 is provided with an elastic opening 152. The elastic sealing sleeve 15 is provided with elastic openings 152, so that the elastic sealing sleeve 15 has a certain elasticity in compression and contraction.

In this embodiment, the upper end of the central hole of the elastic sealing sleeve 15 is concavely provided with an annular stepped groove 151, a sealing ring 16 is assembled in the annular stepped groove 151, the sealing ring 16 is in interference fit with the push rod 3, and the sealing ring 16 abuts against the bottom wall of the open slot 1 b. The seal ring 16 is an O-ring, and in other embodiments, the seal ring 16 has other shapes. The sealing ring 16 seals the push rod 3 and the gap between the contact surfaces of the movable mold 1 and the elastic sealing sleeve 15. The sealing ring 16 and the elastic sealing sleeve 15 are guided, pressed and fixed upwards by the nut 13. When the sealing effect is not good after the elastic sealing sleeve 15 and the sealing ring 16 are worn, the elastic sealing sleeve is provided with the elastic opening 152, the elastic sealing sleeve 15 and the sealing ring 16 are contracted and sealed again by screwing the nut 13, a mold does not need to be removed, and the service life is longer.

In this embodiment, the upper end portion of the elastic sealing sleeve 15 is an upper tapered portion 17 with a diameter gradually decreasing from bottom to top, a groove for embedding the upper tapered portion 17 is provided on the bottom wall of the open slot 1b, and a side wall of the groove is matched with the upper tapered portion 17. The upper conical portion 17 facilitates the positioning and guiding of the elastic sealing sleeve 15. When the nut is screwed up, the lower end of the elastic sealing sleeve 15 is pressed inwards, and the sealing effect is further improved.

In the present embodiment, the nut 13 is a hexagon socket nut. In other embodiments, the nut 13 may also be other types of nuts, and is not limited herein.

In this embodiment, the fixed die 8 includes the fixed die insert 9, the movable die 1 includes the movable die insert 2, the fixed die insert 9 is arranged on the fixed die 8, the movable die insert 2 is arranged on the movable die 1, the joint of the fixed die 8 and the movable die 1 forms the fixed die parting surface 7, and the fixed die parting surface 7 is sequentially provided with the inner-layer sealing strip 11 and the outer-layer sealing strip 12 from inside to outside.

In the present embodiment, the inner weather strip 11 is provided at the interface of the fixed die 8 and the fixed die insert 9, and the outer weather strip 12 is provided at the middle of the peripheral parting surface of the fixed die 8. The inner-layer sealing strip 11 is arranged at the boundary of the fixed die insert 9 and the fixed die 8, and not only seals the parting surface 7 of the movable die, but also seals the gap between the contact surfaces of the fixed die insert 9 and the fixed die 8 and the gap between the contact surfaces of the movable die insert 2 and the movable die 1; outer sealed design is in the middle of 8 peripheral die joints of cover half, and it is sealed as the die joint second way, through set up inside and outside bilayer sealed on moving cover half die joint 7, sealed effect is better.

In this embodiment, the inner layer sealing strip and the outer layer sealing strip are of the same specification, and the sealing strips are made of high-temperature resistant materials.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. A sealing structure of a vacuum die-casting die comprises a movable die (1), a fixed die (8) and a push rod (3), wherein a die cavity (10) is formed between the movable die and the fixed die; the method is characterized in that: an open slot (1b) with a downward opening is formed in the movable die (1), a through hole (1a) with a lower end communicated with the open slot (1b) is formed in the movable die (1), the upper end of the through hole (1a) is communicated with the die cavity (10), the central axis of the through hole (1a) is superposed with the central axis of the open slot (1b), the push rod (3) sequentially penetrates through the open slot (1b) and the through hole (1a), and a sealing adjusting structure is arranged in the open slot (1 b);

the seal adjusting structure comprises an elastic sealing sleeve (15) and a nut (13) used for upwards compressing the elastic sealing sleeve (15), the elastic sealing sleeve (15) is in interference fit with the push rod (3), the upper end of the elastic sealing sleeve (15) is supported on the bottom wall of the open slot (1b), the nut (13) is sleeved on the periphery of the push rod (3), the nut (13) is provided with external threads (14) and is in threaded connection with the inner side wall of the open slot (1b), the upper end part of the center hole of the nut (13) is provided with a tapered opening with the diameter gradually increased from bottom to top, the elastic sealing sleeve (15) is provided with a lower tapered part (18) matched with the tapered opening, and the tapered opening is upwards compressed to the lower tapered part (18).

2. The vacuum die casting mold sealing structure according to claim 1, characterized in that: the elastic sealing sleeve (15) is provided with an elastic opening (152).

3. The vacuum die casting mold sealing structure according to claim 2, characterized in that: the upper end of the central hole of the elastic sealing sleeve (15) is concavely provided with an annular step groove (151), a sealing ring (16) is assembled in the annular step groove (151), the sealing ring (16) is in interference fit with the push rod (3), and the sealing ring (16) abuts against the bottom wall of the open groove (1 b).

4. A vacuum die casting mold sealing structure according to any one of claims 1 to 3, characterized in that: the upper end of the elastic sealing sleeve (15) is an upper conical part (17) with the diameter gradually reduced from bottom to top, a groove for embedding the upper conical part (17) is formed in the bottom wall of the open slot (1b), and the side wall of the groove is matched with the upper conical part (17).

5. The vacuum die casting mold sealing structure according to claim 1, characterized in that: the nut (13) is an inner hexagonal nut.

6. The vacuum die casting mold sealing structure according to claim 1, characterized in that: cover half (8) are including cover half insert (9), movable mould (1) are including the movable mould insert (2), cover half insert (9) set up on cover half (8), the movable mould insert (2) set up on movable mould (1), cover half (8) with movable mould (1) laminating department forms movable and fixed mould die joint (7), movable and fixed mould die joint (7) have set gradually inlayer sealing strip (11) and outer sealing strip (12) from inside to outside.

7. The vacuum die casting mold sealing structure according to claim 6, characterized in that: the inner layer sealing strip (11) is arranged at the interface of the fixed die (8) and the fixed die insert (9), and the outer layer sealing strip (12) is arranged in the middle of the peripheral interface of the fixed die (8).

8. The vacuum die casting mold sealing structure according to claim 3, characterized in that: the sealing ring (16) is an O-shaped sealing ring.