Combined die-casting punch

Abstract

The utility model relates to the technical field of die-casting, in particular to a combined die-casting punch which comprises a punch body and a wear-resistant ring, the wear-resistant ring is nested on the outer wall of the punch body, a gland is mounted at one end, connected with a die-casting machine, of the punch body, and the gland and the punch body are mounted in a sliding fit manner. At least one clamping pin hole is formed in the contact face of the pressing cover and the punch body, an anti-rotating pin is inserted into the clamping pin hole, at least one transverse threaded hole penetrating through the side wall of the punch body is formed in the side wall of the pressing cover, and an external thread jacking column is installed in the transverse threaded hole through threads. The punch has the beneficial effects that the wear-resisting ring can be conveniently replaced through the combined design, the anti-rotating pin is installed between the gland and the punch body, the gland is prevented from rotating, the gland is fixed to the punch body through the external thread jacking column, and axial sliding of the wear-resisting ring caused by loosening of the gland can be avoided.

Description

Modular die-casting punch Technical Field

[0001] This utility model relates to the field of die casting technology, and in particular to a combined die casting punch. Background Technology

[0002] A die-casting punch is a metal part installed on a die-casting machine. It works in conjunction with the injection chamber to allow molten, high-temperature metal to enter the mold, thus forming the die. Frequent use of ordinary punches in high-temperature molten metal will lead to severe wear, increased clearance between the pressure chamber and the punch, reduced vacuum in the equipment, shortened punch life, and increased costs.

[0003] Chinese patent application number 202110364924.X discloses a die-casting punch for a combined die-casting machine. The die-casting punch is a component used in die-casting machines. It includes a punch body, a sliding sleeve, and a fastening nut. The punch body houses a punch rod and has a threaded hole for fixing the punch rod. An external thread on the outer layer of the punch body secures the connection between the sliding sleeve and the body. The sliding sleeve of this die-casting punch is mounted on the punch body using a fastening nut, which is threaded to the punch body. During operation, the fastening nut is prone to rotation due to repeated use, causing the axial sliding clearance of the sliding sleeve to increase, resulting in loosening and inability to tighten, thus affecting its service life. Summary of the Invention

[0004] This invention proposes a combined die-casting punch to solve the above-mentioned problems.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A combined die-casting punch includes a punch body and a wear-resistant ring. The punch body has an axial assembly hole formed inside, and an internal thread for connecting with a die-casting machine is formed inside the axial assembly hole. The wear-resistant ring is nested on the outer wall of the punch body, and an expansion joint is formed on the outer wall of the wear-resistant ring. A pressure cap is installed at the end of the punch body connected to the die-casting machine. The pressure cap is slidably fitted with the punch body. At least one locking pin hole is formed on the contact surface of the pressure cap and the punch body. An anti-rotation pin to prevent the pressure cap from rotating relative to the punch body is inserted into the locking pin hole. At least one transverse threaded hole is formed on the side wall of the pressure cap, penetrating to the side wall of the punch body. An external threaded top post to prevent the pressure cap from moving is threadedly installed in the transverse threaded hole.

[0007] Furthermore, the punch body includes a sliding sleeve for mounting a wear-resistant ring. One end of the sliding sleeve is integrally formed with a limiting part, and the other end of the sliding sleeve is integrally formed with a connecting part for mounting the pressure cap. The locking pin hole is formed on the outer wall of the connecting part.

[0008] Furthermore, at least one step for mounting the wear-resistant ring is formed on the outer wall of the sliding sleeve, and the diameters of several steps for mounting the wear-resistant ring change sequentially.

[0009] Furthermore, a nut segment formed by milling is formed on the outer wall of the gland, the transverse threaded hole is formed on the nut segment, and a hidden groove is formed on the outer wall of the nut segment corresponding to the position of the transverse threaded hole, and the outer end of the external threaded top post is hidden in the hidden groove.

[0010] The beneficial effects of this utility model by adopting the above technical solution are as follows: the modular design allows the wear-resistant rings to be freely combined, which is suitable for different production process requirements, especially for high vacuum process requirements, which can effectively ensure product quality and improve production efficiency; the punch body can be reused, resulting in low operating costs; there is no need to modify the original structure of the injection rod and connector, making disassembly and installation convenient; an anti-rotation pin is installed between the pressure cap and the punch body to prevent the pressure cap from rotating, and the pressure cap is fixed to the punch body by an external threaded top post, which can prevent the wear-resistant ring from sliding axially due to the pressure cap loosening. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 is an exploded view of this utility model;

[0013] Figure 2 is a schematic diagram of the combined state of this utility model;

[0014] Figure 3 is a front view of the combined state of this utility model;

[0015] Figure 4 is a cross-sectional view of the present invention in its combined state;

[0016] Figure 5 is a perspective view of the punch body of this utility model;

[0017] Figure 6 is a cross-sectional view of another embodiment of the punch body of this utility model;

[0018] Figure 7 is a schematic diagram of another embodiment of this utility model.

[0019] The annotations in the attached figures are explained as follows:

[0020] 1. Punch body; 11. Limiting part; 12. Sliding sleeve part; 13. Connecting part; 14. Internal thread; 2. Locking pin hole; 3. Anti-rotation pin; 4. Wear-resistant ring; 41. Expansion joint; 5. Pressure cap; 51. Nut section; 52. Transverse threaded hole; 53. External threaded top post. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] As shown in Figures 1-5, the combined die-casting punch includes a punch body 1 and a wear-resistant ring 4. The punch body 1 is made of H13 electroslag remelted steel, which solves the problem of end-face cracking caused by thermal fatigue during long-term use of other types of punches, allowing the punch to be used in high-requirement applications such as magnesium alloy die casting. The punch body 1 has an axial mounting hole formed inside, and an internal thread 14 for connecting with the die-casting machine is formed in the axial mounting hole. The wear-resistant ring 4 is nested on the outer wall of the punch body 1, and an expansion joint 41 is formed on the outer wall of the wear-resistant ring 4. The wear-resistant ring 4 is located near the limiting part 11. The inner wall of one end of the wear ring 4 is chamfered, allowing for easy replacement according to process requirements. The outer wall of the end of the wear ring 4 near the pressure cap 5 is also chamfered, allowing for easy replacement according to process requirements. The pressure cap 5 is installed at the end of the punch body 1 connected to the die-casting machine. The punch body 1 includes a sliding sleeve 12 for mounting the wear ring 4. One end of the sliding sleeve 12 has an integrally formed limiting part 11, and the other end of the sliding sleeve 12 has an integrally formed connecting part 13 for mounting the pressure cap 5. The diameter of the connecting part 13 is smaller than the diameter of the sliding sleeve 12, and the diameter of the sliding sleeve 12 is smaller than the diameter of the limiting part 11. The pressure cap 5... The pressure cap 5 is slidably fitted with the punch body 1. The outer diameter of the wear ring 4 is the same as the diameter of the limiting part 13. The outer diameter of the pressure cap 5 does not exceed the outer diameter of the wear ring 4. Three locking holes 2 are formed on the contact surface between the pressure cap 5 and the punch body 1. The locking holes 2 are formed on the outer wall of the connecting part 13. An anti-rotation pin 3 is inserted into the locking holes 2 to prevent the pressure cap 5 from rotating relative to the punch body 1. Two transverse threaded holes 52 are formed on the side wall of the pressure cap 5, which penetrate to the side wall of the punch body 1. An external threaded top post 53 is installed in the transverse threaded holes 52 to prevent the pressure cap 5 from moving. 3. The outer end is machined with a slotted or cross-shaped groove for easy screwdriver insertion. The external threaded top post 53 can increase the friction between the pressure cap 5 and the connecting part 13, and improve the fixing firmness of the pressure cap 5. The overall shape and size of the punch body 1, wear-resistant ring 4 and pressure cap 5 are the same as the existing old-style punch. The parameters such as the internal thread 14, mating hole, and length of the combined die-casting punch are exactly the same as the original old-style punch. This allows the old-style punch to be directly replaced with the combined die-casting punch of this application without changing the structure, size and other parameters of the original injection part.

[0023] In this embodiment, a nut segment 51 formed by milling is formed on the outer wall of the pressure cap 5. There is at least one nut segment 51. A transverse threaded hole 52 is formed at the connection of the flat end face of the nut segment 51. A hidden groove is formed on the outer wall of the nut segment 51 at the position corresponding to the transverse threaded hole 52. The outer end of the external threaded top post 53 is hidden in the hidden groove to avoid the end of the external threaded top post 53 being exposed and causing bumps and wear.

[0024] As shown in Figure 6, as another preferred design of this utility model, the outer wall of the sliding sleeve 12 can be formed with several steps of varying diameters, which can be used in conjunction with wear-resistant rings of different sizes and applied to different working scenarios.

[0025] As shown in Figure 6, as another preferred design of this utility model, the outer circle of the limiting part 11 is provided with several arc-shaped openings to facilitate the entry of molten metal, so as to ensure that the molten metal can quickly contact the wear-resistant ring 4 during operation and improve the vacuum degree.

[0026] As shown in Figure 7, as another preferred design of this utility model, the wear-resistant ring 4 can be any one of copper ring, steel ring, iron ring, or nano-ceramic ring, and can be a single ring or multiple rings. When the wear-resistant ring 4 is composed of multiple rings, only the side wall of the ring at the end away from the pressure cap 5 can be provided with an expansion joint 41, and the other rings can be provided with expansion joints 41 or not. The wear-resistant ring 4 and the punch body 1 can be freely combined to adapt to different production process requirements, can be used multiple times, reduce costs, and provide equipment vacuum and improve production efficiency.

[0027] The combined die-casting punch of this application has good interchangeability, good cooling, strong wear resistance, high vacuum degree, impact resistance, durability, low operating cost, and high cost performance.

[0028] Components not described in detail in this article are existing technologies.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A combined die-casting punch, comprising a punch body (1) and a wear-resistant ring (4), wherein the punch body (1) has an axial assembly hole formed inside, and an internal thread (14) for connecting with a die-casting machine is formed in the axial assembly hole; the wear-resistant ring (4) is nested on the outer wall of the punch body (1), and an expansion joint (41) is formed on the outer wall of the wear-resistant ring (4); a pressure cap (5) is installed at the end of the punch body (1) connected to the die-casting machine, characterized in that: The pressure cap (5) is slidably fitted to the punch body (1). At least one locking hole (2) is formed on the contact surface of the pressure cap (5) and the punch body (1). An anti-rotation pin (3) is inserted into the locking hole (2) to prevent the pressure cap (5) from rotating relative to the punch body (1). At least one transverse threaded hole (52) is formed on the side wall of the pressure cap (5) and extends through the side wall of the punch body (1). An external threaded top post (53) is installed in the transverse threaded hole (52) to prevent the pressure cap (5) from moving.

2. The combined die-casting punch according to claim 1, characterized in that: The punch body (1) includes a sliding sleeve (12) for mounting a wear-resistant ring (4). One end of the sliding sleeve (12) is integrally formed with a limiting part (11), and the other end of the sliding sleeve (12) is integrally formed with a connecting part (13) for mounting the pressure cap (5). The locking hole (2) is formed on the outer wall of the connecting part (13).

3. The combined die-casting punch according to claim 2, characterized in that: The outer wall of the sliding sleeve (12) is formed with at least one step for mounting the wear-resistant ring (4), and the diameter of several steps for mounting the wear-resistant ring (4) varies sequentially.

4. The modular die casting punch of claim 1, wherein: The outer wall of the pressure cap (5) is formed with a nut segment (51) machined by a milling cutter. The transverse threaded hole (52) is formed on the nut segment (51). A hidden groove is formed on the outer wall of the nut segment (51) corresponding to the position of the transverse threaded hole (52). The outer end of the external threaded top post (53) is hidden in the hidden groove.

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