Die-casting sealing punch

Abstract

The invention discloses a die-casting sealing punch, and relates to the technical field of die-casting, the die-casting sealing punch comprises a punch body, a plurality of elastic rings are wound on the periphery of the punch body, a first buckling part and a second buckling part which are buckled with each other are arranged on the elastic rings, and the two side walls, in the axis direction of the punch body, of the first buckling part are inclined to the circumferential direction of the elastic rings; the two side walls, in the axis direction of the punch body, of the first buckling part can be in press contact with the side wall of the second buckling part when the elastic ring is elastically unfolded, so that the unfolding amplitude of the elastic ring is limited, the situation that the elastic ring is excessively large in unfolding amplitude and occupies too much space after the punch is disassembled is avoided while the sealing performance is improved, storage of the punch is facilitated, and the service life of the punch is prolonged. And the difficulty of re-installation of the punch can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of die casting, in particular to a die casting sealing punch. Background Art

[0002] Pressure casting (die casting for short) is an efficient casting process that injects molten metal into a precision mold under high pressure and rapidly cools it to form. It is widely used in the automotive, electronics, home appliance and other industries. The die-casting sealing punch is a key component of the die-casting machine. It is mainly used to close the gate of the mold during the injection process to prevent the molten metal from flowing back and ensure that the molten metal fills the cavity under high pressure. Its sealing performance directly affects the quality and molding effect of the casting.

[0003] The current die-casting punch achieves circumferential sealing with the pressure chamber through a sealing ring. However, after a period of use, the sealing ring will wear out and the sealing effect will weaken. During the production process, air will leak into the pressure chamber and mix with the aluminum liquid, resulting in internal pores in the die-cast product and product defects. In response to this, there are punches on the market that use elastic sealing rings. However, after the punch is removed from the pressure chamber, the elastic sealing ring will automatically expand, which is not convenient for storage, and it is difficult to reinstall the punch. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a die-casting sealing punch, which can improve the sealing effect, facilitate storage, and reduce the difficulty of installation.

[0005] A die-cast sealing punch according to an embodiment of the present invention includes: The punch body has multiple elastic rings wrapped around its outer circumference, and the elastic ring is provided with a first snap-fitting portion and a second snap-fitting portion. Both sides of the first snap-fitting portion have second snap-fitting portions snapped therewith, and a gap is provided between the outer circumferential wall of the first snap-fitting portion and the outer circumferential wall of the second snap-fitting portion. The two side walls of the first snap-fitting portion along the axial direction of the punch body are inclined to the circumferential direction of the elastic ring, so that when the elastic ring is elastically expanded, the two side walls of the first snap-fitting portion along the axial direction of the punch body can be pressed against the side walls of the second snap-fitting portion, thereby limiting the expansion range of the elastic ring.

[0006] A die-cast sealing punch according to an embodiment of the present invention has at least the following beneficial effects: In this embodiment, a plurality of elastic rings are wound around the outer circumference of the punch body, and a first snap-fitting portion and a second snap-fitting portion that snap into each other are provided on the elastic ring. The two side walls of the first snap-fitting portion along the axial direction of the punch body are inclined to the circumferential direction of the elastic ring, so that when the elastic ring is elastically expanded, the two side walls of the first snap-fitting portion along the axial direction of the punch body can be pressed against the side walls of the second snap-fitting portion, thereby limiting the expansion range of the elastic ring, thereby improving the sealing performance while preventing the elastic ring from opening too much and occupying too much space after the punch is disassembled, thereby facilitating the storage of the punch and reducing the difficulty of reinstalling the punch.

[0007] According to some embodiments of the present invention, the first buckling portion includes a first side wall and a second side wall inclined to the circumference of the elastic ring, and the second buckling portion includes a third side wall and a fourth side wall inclined to the circumference of the elastic ring, the first side wall corresponds to the third side wall, and the second side wall corresponds to the fourth side wall.

[0008] According to some embodiments of the present invention, the first buckle portion includes a first side wall, a second side wall and a fifth side wall, the extension direction of the fifth side wall is parallel to the axial direction of the punch body, and a first angle N1 is formed between the first side wall and the fifth side wall, satisfying: 45°≤N1≤65°; And / or, a second angle N2 is formed between the second side wall and the fifth side wall, satisfying: 45°≤N2≤65°.

[0009] According to some embodiments of the present invention, the first buckle portion includes a first side wall and a second side wall, the second buckle portion includes a third side wall and a fourth side wall, the first side wall is parallel to the third side wall, the second side wall is parallel to the fourth side wall, and a third angle N3 is formed between the first side wall and the radial direction of the punch body, satisfying: 25°≤N3≤35°; And / or, a fourth angle N4 is formed between the second side wall and the radial direction of the punch body, satisfying: 25°≤N4≤35°.

[0010] According to some embodiments of the present invention, the slits penetrate both sides of the elastic ring along the axial direction of the punch body, and the slits of two adjacent elastic rings are staggered along the circumferential direction of the punch body.

[0011] According to some embodiments of the present invention, the punch body is provided with a support member, the support member is wrapped around the radial outer peripheral wall of the punch body, and the support member elastically contacts the radial inner peripheral wall of the elastic ring.

[0012] According to some embodiments of the present invention, a radial outer peripheral wall of the punch body is provided with a head ring and a tail ring, and at least two elastic rings are provided between the head ring and the tail ring.

[0013] According to some embodiments of the present invention, the punch body is provided with a partition, and the radial outer peripheral wall of the punch body is provided with a head ring and a tail ring, the partition is located between the head ring and the elastic ring, and the maximum outer diameter of the partition is smaller than the maximum outer diameter of the head ring.

[0014] According to some embodiments of the present invention, a first limiting groove is provided on one side of the partition portion facing the elastic ring, the first limiting groove extends circumferentially around the punch body, and a convex edge is provided on one side of the elastic ring to be inserted into the first limiting groove.

[0015] According to some embodiments of the present invention, a second limiting groove is provided on one side of the tail ring facing the elastic ring, the second limiting groove extends circumferentially around the punch body, and a convex edge inserted into the second limiting groove is provided on one side of the elastic ring.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 A three-dimensional view of a die-cast sealing punch in an embodiment of the present invention; Figure 2 A side view of a die-cast sealing punch according to an embodiment of the present invention; Figure 3 for Figure 2 A magnified view of center A; Figure 4 is a cross-sectional view of a die-cast sealing punch according to an embodiment of the present invention; Figure 5 for Figure 4 Magnified view of middle B; Figure 6 Schematic diagram of the third angle N3 and the fourth angle N4 in an embodiment of the present invention.

[0018] Reference numerals: Punch body 100; head ring 101; tail ring 102; partition 103; first limiting groove 104; second limiting groove 105; support member 106; receiving groove 107; The elastic ring 110 , the first buckling portion 111 , the first side wall 112 , the second side wall 113 , the fifth side wall 114 , the second buckling portion 116 , the third side wall 117 , the fourth side wall 118 , the gap 119 , and the convex edge 120 . DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0020] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0022] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0023] In the related technology, pressure casting (abbreviated as die casting) is an efficient casting process that injects molten metal into a precision mold under high pressure and quickly cools it to form. It is widely used in the automotive, electronics, home appliance and other industries. The die-casting sealing punch is a key component of the die-casting machine. It is mainly used to close the gate of the mold during the injection process to prevent the molten metal from flowing back and ensure that the molten metal fills the cavity under high pressure. Its sealing performance directly affects the quality and molding effect of the casting.

[0024] The current die-casting punch achieves circumferential sealing with the pressure chamber through a sealing ring. However, after a period of use, the sealing ring will wear out and the sealing effect will weaken. During the production process, air will leak into the pressure chamber and mix with the aluminum liquid, resulting in internal pores in the die-cast product and product defects. In response to this, there are punches on the market that use elastic sealing rings. However, after the punch is removed from the pressure chamber, the elastic sealing ring will automatically expand, which is not convenient for storage, and it is difficult to reinstall the punch.

[0025] To solve the above problems, refer to Figure 1 and Figure 2In an embodiment of the present invention, a die-cast sealing punch includes a punch body 100, and a head ring 101, a tail ring 102 and a plurality of elastic rings 110 are wound around the outer circumference of the punch body 100, and the plurality of elastic rings 110 are located between the head ring 101 and the tail ring 102. In this embodiment, at least two elastic rings 110 are provided, and the axial side walls of the two elastic rings 110 are in conflict with each other. It can be understood that the elastic ring 110 is provided with a first buckle portion 111 and a second buckle portion 116, and both sides of the first buckle portion 111 have a second buckle portion 116 buckled therewith, and a gap 119 is provided between the outer circumferential wall of the first buckle portion 111 and the outer circumferential wall of the second buckle portion 116, and the gap 119 is used to allow the first buckle portion 111 and the second buckle portion 116 to move within a certain range. It is understandable that when the punch body 100 is installed in the pressure chamber of the die-casting machine, the inner wall of the pressure chamber presses against the outer wall of the elastic ring 110, and the gap 119 between the first buckle portion 111 and the second buckle portion 116 can ensure that the elastic ring 110 has a tendency to expand outward.

[0026] It can be understood that during the operation of the punch body 100, the outer wall of the elastic ring 110 and the inner wall of the pressure chamber are constantly rubbed, so that the outer wall of the elastic ring 110 will be worn, and the maximum outer diameter of the elastic ring 110 will become smaller. At this time, the elastic ring 110 continues to expand under the action of its own elasticity, and the distance between the wall surfaces on both sides of the axial direction of the first buckle part 111 and the side wall of the second buckle part 116 will continue to shorten. When the elastic ring 110 is worn to a certain extent, the wall surfaces on both sides of the axial direction of the punch body 100 of the first buckle part 111 contact the side wall of the second buckle part 116. At this time, the elastic ring 110 can no longer be further expanded, and the elastic ring 110 has reached its service life. If it continues to be used, the outer wall of the elastic ring 110 will continue to wear, and a gap will be generated between the outer wall of the elastic ring 110 and the inner wall of the pressure chamber, resulting in sealing failure and product defects.

[0027] It can be understood that the gap 119 runs through both sides of the elastic ring 110 along the axial direction of the punch body 100, and the gaps 119 of two adjacent elastic rings 110 are staggered along the circumference of the punch body 100, which is beneficial to ensure the sealing effect along the axial direction and prevent aluminum liquid from entering the gap 119 during stamping.

[0028] Reference Figure 4 and Figure 5It is understood that the punch body 100 is provided with a partition 103, and the radial outer peripheral wall of the punch body 100 is sleeved with a head ring 101 and a tail ring 102, the partition 103 is located between the head ring 101 and the elastic ring 110, and the maximum outer diameter of the partition 103 is smaller than the maximum outer diameter of the head ring 101, so as to avoid the outer peripheral wall of the partition 103 from contacting the inner peripheral wall of the pressure chamber. It is understood that the partition 103 is provided with a first limiting groove 104 on the side facing the elastic ring 110, and the limiting groove extends around the circumference of the punch body 100, and a convex edge 120 is provided on one side of the elastic ring 110 and inserted into the first limiting groove 104. The convex edge 120 is inserted into the first limiting groove 104 to limit the radial expansion range of the elastic ring 110 along the punch body 100, and can further avoid excessive expansion of the elastic ring 110 during storage, thereby saving space.

[0029] It can be understood that, along the axial direction of the punch body 100, the end face of the tail ring 102 contacts the end face of the elastic ring 110. At the same time, the tail ring 102 is provided with a second limiting groove 105 on the side facing the elastic ring 110. The second limiting groove 105 extends around the circumference of the punch body 100. One side of the elastic ring 110 is provided with a convex edge 120 inserted into the second limiting groove 105, which can further limit the radial expansion range of the elastic ring 110 along the punch body 100, avoid excessive expansion of the elastic ring 110 during storage, and thus save space.

[0030] Reference Figure 4 and Figure 5 Furthermore, the punch body 100 is provided with a support member 106, which is wound around the radial outer peripheral wall of the punch body 100, and the support member 106 elastically contacts the radial inner peripheral wall of the elastic ring 110. In this embodiment, the support member 106 is a coil spring, and the outer peripheral wall of the punch body 100 is provided with a circumferentially extending receiving groove 107, and the support member 106 is embedded in the receiving groove 107. It can be understood that the support member 106 can elastically support the elastic ring 110 along the radial direction of the punch body 100, and can keep the outer peripheral wall of the elastic ring 110 in elastic pressure contact with the inner peripheral wall of the pressure chamber during the working process of the punch body 100, thereby ensuring a good sealing effect.

[0031] It can be understood that the two side walls of the first snap-fit ​​portion 111 along the axial direction of the punch body 100 are inclined to the circumferential direction of the elastic ring 110, and when the punch body 100 is removed from the pressure chamber, the elastic ring 110 is freely expanded. At this time, the two side walls of the first snap-fit ​​portion 111 along the axial direction of the punch body 100 can be pressed into contact with the side walls of the second snap-fit ​​portion 116, thereby limiting the expansion range of the elastic ring 110, thereby improving the sealing performance while avoiding the elastic ring 110 from opening too much and occupying too much space after the punch body 100 is disassembled, which facilitates the storage of the punch body 100 and reduces the difficulty of reinstalling the punch body 100.

[0032] Reference Figure 3 It can be understood that the first buckle portion 111 has a first side wall 112 and a second side wall 113 inclined to the circumference of the elastic ring 110 on both sides, and the second buckle portion 116 has a third side wall 117 and a fourth side wall 118 inclined to the circumference of the elastic ring 110, the first side wall 112 corresponds to the third side wall 117, the second side wall 113 corresponds to the fourth side wall 118, and the first side wall 112 is not parallel to the second side wall 113. It can be understood that when the elastic ring 110 is opened, the first side wall 112 presses the third side wall 117, and the second side wall 113 presses the fourth side wall 118, which can reduce the component force generated along the axis direction of the punch body 100 when the first buckle portion 111 and the second buckle portion 116 press, which is conducive to making the elastic ring 110 balanced, thereby avoiding stress concentration in the elastic part, and is conducive to the elastic ring 110 to maintain good elastic properties after long-term placement.

[0033] It is understood that when the elastic ring 110 is initially installed, that is, when the outer peripheral wall of the elastic ring 110 is not worn, the gap 119 has a preset minimum distance S1, and the minimum distance S1 is the shortest distance between the first side wall 112 and the third side wall 117 (not shown in the figure), or the minimum distance S1 is the minimum distance between the second side wall 113 and the fourth side wall 118. Further, the projection of the minimum distance S1 along the axial direction of the punch body 100 has a minimum distance S2, and it is understood that the minimum distance S2 is actually the minimum relative movement distance between the first buckle portion 111 and the second buckle portion 116 along the circumferential direction of the sealing ring.

[0034] Reference Figure 3 It can be understood that the first buckling portion 111 is also provided with a fifth side wall 114, the extension direction of the fifth side wall 114 is parallel to the axial direction of the punch body 100, and there is a first angle N1 between the first side wall 112 and the fifth side wall 114, satisfying: 45°≤N1≤65°.

[0035] It is understandable that when the first angle N1 is less than 45°, the angle between the first side wall 112 and the fifth side wall 114 is too small. During the operation of the punch body 100, the outer peripheral wall of the elastic ring 110 will be worn, resulting in a decrease in its maximum outer diameter. At this time, the elastic ring 110 will continue to expand under its own elasticity, causing the distance between the first side wall 112 and the third side wall 117, and the distance between the second side wall 113 and the fourth side wall 118 to continue to decrease. When the elastic ring 110 is worn to a certain extent, the first side wall 112 contacts the third side wall 117, and the second side wall 113 contacts the fourth side wall 118. At this time, the elastic ring 110 can no longer be further expanded, and the elastic ring 110 has reached the end of its service life. Therefore, when the first angle N1 is less than 45°, the circumferential projection areas of the first side wall 112, the second side wall 113, the third side wall 117 and the fourth side wall 118 on the elastic ring 110 are too large. Under the premise that the minimum distance S1 remains unchanged, the length of the projection of the minimum distance S1 along the axial direction of the punch body 100 is too small, thereby reducing the movable distance between the first snap-fit ​​portion 111 and the second snap-fit ​​portion 116, causing the first snap-fit ​​portion 111 and the second snap-fit ​​portion 116 to contact prematurely after wear of the elastic ring 110, thereby shortening the service life of the elastic ring 110.

[0036] When the first angle N1>65°, the angle between the first side wall 112 and the fifth side wall 114 is too large, resulting in a too small projection area of ​​the contact surface of the first buckle portion 111 and the second buckle portion 116 along the circumferential direction, so that the connection stability between the first buckle portion 111 and the second buckle portion 116 is weakened and easily disengaged, which is not conducive to the storage of the punch body 100. Therefore, only when the first angle N1 between the first side wall 112 and the fifth side wall 114 satisfies 45°≤N1≤65°, can the elastic ring 110 have a good service life while ensuring the connection stability.

[0037] In some embodiments, there is a second angle N2 between the second side wall 113 and the fifth side wall 114, which satisfies: 45°≤N2≤65°. It can be understood that when the second angle N2 is less than 45°, the angle between the second side wall 113 and the fifth side wall 114 is too small. Since the outer peripheral wall of the elastic ring 110 will be worn during the operation of the punch body 100, causing its maximum outer diameter to decrease, at this time, the elastic ring 110 is continuously expanded under its own elastic action, which will cause the distance between the first side wall 112 and the third side wall 117, and the distance between the second side wall 113 and the fourth side wall 118 to continuously decrease. When the elastic ring 110 is worn to a certain extent, the first side wall 112 contacts the third side wall 117, and the second side wall 113 contacts the fourth side wall 118. At this time, the elastic ring 110 can no longer be further expanded, and the elastic ring 110 has reached the end of its service life. Therefore, when the second angle N2 is less than 45°, the circumferential projection areas of the first side wall 112, the second side wall 113, the third side wall 117 and the fourth side wall 118 on the elastic ring 110 are too large. Under the premise that the minimum distance S1 remains unchanged, the length of the projection of the minimum distance S1 along the axial direction of the punch body 100 is too small, thereby reducing the movable distance between the first snap-fit ​​portion 111 and the second snap-fit ​​portion 116, causing the first snap-fit ​​portion 111 and the second snap-fit ​​portion 116 to contact prematurely after wear of the elastic ring 110, thereby shortening the service life of the elastic ring 110.

[0038] When the second angle N2>65°, the angle between the second side wall 113 and the fifth side wall 114 is too large, resulting in too small a circumferential projection area of ​​the first side wall 112, the second side wall 113, the third side wall 117 and the fourth side wall 118, so that the connection stability between the first buckle portion 111 and the second buckle portion 116 is weakened and easily disengaged, which is not conducive to the storage of the punch body 100. Therefore, only when the second angle N2 between the second side wall 113 and the fifth side wall 114 satisfies 45°≤N2≤65°, can the connection stability be maintained while ensuring the structural strength of the elastic ring 110, and can ensure that the elastic ring 110 has a good service life.

[0039] Reference Figure 6It can be understood that the first side wall 112 and the second side wall 113 are inclined to the radial direction of the punch body 100. Specifically, along the radial direction of the punch body 100, the first side wall 112 is inclined from the outer peripheral wall of the elastic ring 110 to the inner peripheral wall in a direction close to the center of the elastic ring 110, and the second side wall 113 is inclined from the outer peripheral wall of the elastic ring 110 to the inner peripheral wall in a direction close to the center of the elastic ring 110. It can be understood that after the punch body 100 is disassembled, the elastic ring 110 is sleeved on the outer periphery of the punch body 100 and unfolds naturally. When unfolding, the first side wall 112 presses the third side wall 117, and the second side wall 113 presses the fourth side wall 118. At this time, since the maximum diameter of the elastic ring 110 has a tendency to increase, the first buckle portion 111 and the second buckle portion 116 have a tendency to move in opposite directions along the circumference of the elastic ring 110, and both have a tendency to move outward at the same time along the radial direction of the elastic ring 110. Therefore, the inclined first side wall 112 and the second side wall 113 can limit the first buckle portion 111 and the second buckle portion 116 from moving outward at the same time along the radial direction of the elastic ring 110, which is conducive to improving the buckling stability of the first buckle portion 111 and the second buckle portion 116. Further, the first side wall 112 is parallel to the third side wall 117, and the second side wall 113 is parallel to the fourth side wall 118.

[0040] In some embodiments, the first side wall 112 and the second side wall 113 are inclined to the radial direction of the punch body 100, and the first side wall 112 is inclined in the direction from the outer peripheral wall of the elastic ring 110 to the inner peripheral wall away from the center of the elastic ring 110, and the second side wall 113 is inclined in the direction from the outer peripheral wall of the elastic ring 110 to the inner peripheral wall away from the center of the elastic ring 110.

[0041] Reference Figure 6 It can be understood that there is a third angle N3 between the first side wall 112 and the radial direction of the punch body 100, which satisfies: 25°≤N3≤35°. It can be understood that in this embodiment, a radial line M extending along the radial direction of the punch body 100 is proposed as an auxiliary line, and the third angle N3 between the first side wall 112 and the radial direction of the punch body 100 is the angle between the first side wall 112 and the radial line M.

[0042] It is understandable that when the third angle N3 is less than 25°, the angle between the first side wall 112 and the radial direction of the punch body 100 is too small, so the projection area of ​​the contact surface of the first side wall 112 and the third side wall 117 along the radial direction of the punch body 100 is too small, which will lead to insufficient connection strength between the first buckle portion 111 and the second buckle portion 116, which is easy to deform or even fall out, resulting in the elastic ring 110 being unable to remain stable during storage. When the third angle N3 is greater than 35°, the angle between the first side wall 112 and the radial direction of the punch body 100 is too large, so the projection area of ​​the contact surface of the first side wall 112 and the third side wall 117 along the radial direction of the punch body 100 is too large, and the thickness of the first buckle portion 111 at the part connected to the second buckle portion 116 becomes too thin, which will weaken the structural strength of the first buckle portion 111, and it is easy to deform after long-term pressure contact, which will cause the elastic ring 110 to fail to work normally after being reinstalled in the pressure chamber. Therefore, only when the third angle N3 between the first side wall 112 and the radial direction of the punch body 100 satisfies 25°≤N3≤35° can the first buckling portion 111 have good structural strength and improve the buckling stability between the first buckling portion 111 and the second buckling portion 116.

[0043] In some embodiments, a fourth angle N4 is formed between the second side wall 113 and the radial direction of the punch body 100, satisfying: 25°≤N4≤35°. It can be understood that the fourth angle N4 between the second side wall 113 and the radial direction of the punch body 100 is the angle between the second side wall 113 and the radial line M.

[0044] It is understandable that when the fourth angle N4 is less than 25°, the angle between the second side wall 113 and the radial direction of the punch body 100 is too small, so the projection area of ​​the contact surface of the second side wall 113 and the fourth side wall 118 along the radial direction of the punch body 100 is too small, which will lead to insufficient connection strength between the first buckle 111 and the second buckle 116, which is easy to deform or even fall out, resulting in the elastic ring 110 being unable to remain stable during storage. When the fourth angle N4 is greater than 35°, the angle between the second side wall 113 and the radial direction of the punch body 100 is too large, so the projection area of ​​the contact surface of the second side wall 113 and the fourth side wall 118 along the radial direction of the punch body 100 is too large, and the thickness of the first buckle 111 at the part connected to the second buckle 116 becomes too thin, which will weaken the structural strength of the first buckle 111, and it is easy to deform after long-term pressure contact, which will cause the elastic ring 110 to fail to work normally after being reinstalled in the pressure chamber. Therefore, only when the fourth angle N4 between the second side wall 113 and the radial direction of the punch body 100 satisfies 25°≤N4≤35° can the first buckling portion 111 have good structural strength and improve the buckling stability between the first buckling portion 111 and the second buckling portion 116.

[0045] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A die-cast sealing punch, characterized in that: include: The punch body has multiple elastic rings wrapped around its outer circumference, and the elastic ring is provided with a first snap-fitting portion and a second snap-fitting portion. Both sides of the first snap-fitting portion have the second snap-fitting portions snapped therewith, and a gap is provided between the outer circumferential wall of the first snap-fitting portion and the outer circumferential wall of the second snap-fitting portion. The two side walls of the first snap-fitting portion along the axial direction of the punch body are inclined to the circumferential direction of the elastic ring, so that when the elastic ring is elastically expanded, the two side walls of the first snap-fitting portion along the axial direction of the punch body can be pressed against the side walls of the second snap-fitting portion, thereby limiting the expansion range of the elastic ring.

2. A die-cast sealing punch according to claim 1, characterized in that: The first buckling portion includes a first side wall and a second side wall inclined to the circumference of the elastic ring, and the second buckling portion includes a third side wall and a fourth side wall inclined to the circumference of the elastic ring. The first side wall corresponds to the third side wall, and the second side wall corresponds to the fourth side wall.

3. The die-cast sealing punch according to claim 1, characterized in that: The first buckle portion includes a first side wall, a second side wall and a fifth side wall, the extension direction of the fifth side wall is parallel to the axial direction of the punch body, and a first angle N1 is formed between the first side wall and the fifth side wall, satisfying: 45°≤N1≤65°; And / or, a second angle N2 is formed between the second side wall and the fifth side wall, satisfying: 45°≤N2≤65°.

4. The die-cast sealing punch according to claim 1, characterized in that: The first buckle connection portion includes a first side wall and a second side wall, the second buckle connection portion includes a third side wall and a fourth side wall, the first side wall is parallel to the third side wall, the second side wall is parallel to the fourth side wall, and a third angle N3 is formed between the first side wall and the radial direction of the punch body, satisfying: 25°≤N3≤35°; And / or, a fourth angle N4 is formed between the second side wall and the radial direction of the punch body, satisfying: 25°≤N4≤35°.

5. The die-cast sealing punch according to claim 1, characterized in that: The slits penetrate through both sides of the elastic ring along the axial direction of the punch body, and the slits of two adjacent elastic rings are staggered along the circumferential direction of the punch body.

6. The die-cast sealing punch according to claim 1, characterized in that: The punch body is provided with a support member, the support member is wound around the radial outer peripheral wall of the punch body, and the support member elastically contacts the radial inner peripheral wall of the elastic ring.

7. The die-cast sealing punch according to claim 1, characterized in that: A head ring and a tail ring are sleeved on the radial outer peripheral wall of the punch body, and at least two elastic rings are arranged between the head ring and the tail ring.

8. The die-cast sealing punch according to claim 1, characterized in that: The punch body is provided with a partition, and the radial outer peripheral wall of the punch body is sleeved with a head ring and a tail ring, the partition is located between the head ring and the elastic ring, and the maximum outer diameter of the partition is smaller than the maximum outer diameter of the head ring.

9. The die-cast sealing punch according to claim 8, characterized in that: A first limiting groove is provided on one side of the partition portion facing the elastic ring, the first limiting groove extends around the circumference of the punch body, and a convex edge is provided on one side of the elastic ring to be inserted into the first limiting groove.

10. The die-cast sealing punch according to claim 8, characterized in that: A second limiting groove is provided on one side of the tail ring facing the elastic ring, the second limiting groove extends around the circumference of the punch body, and a convex edge inserted into the second limiting groove is provided on one side of the elastic ring.

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