A fixed structure of a thick material metal plate side punch

Abstract

The utility model discloses a kind of thick material sheet metal side punch fixed structure, belong to cold stamping die technical field, comprising: side punch inclined wedge mechanism, with the side punch inclined wedge mechanism sliding cooperation and is driven by its side punch slider assembly, and detachably installed on the side punch slider assembly stamping end face side punch punch ;The side punch inclined wedge mechanism includes: the inclined wedge drive seat of being arranged in the bottom of the side punch inclined wedge mechanism, and reset hook is arranged in the top surface of the side punch inclined wedge mechanism;The side punch slider assembly includes: punch mounting seat is arranged in the front end of the side punch slider assembly, self-lubricating guide plate is arranged in the both sides of the side punch slider assembly, and convex reinforcing positioning rib is integrally formed on the end face of punch mounting seat;The side punch punch includes: recessed embedded reinforcing groove is arranged in the rear end of side punch punch matrix.The utility model ensures the stamping precision of side punch die under long-term high load working condition by connecting between side punch punch and side punch slider assembly.

Description

Technical Field

[0001] This utility model relates to the field of cold stamping die technology, and in particular to a fixing structure for a side punch of a thick sheet metal. Background Technology

[0002] The punch is the core component that directly contacts the sheet metal to perform punching or cutting. In a side-punching mechanism, the punch must be securely locked to the slide block assembly to transmit the enormous punching force, and the fixing structure must be able to withstand and transmit the thrust from the slide block, allowing the punch to penetrate thick sheet metal. After punching, the punch generates significant friction as it is pulled out of the sheet metal. If it is not securely fixed, the punch can easily become stuck in the sheet metal or detach from the slide block. Punches are suitable for producing parts that require punching or machining on a side perpendicular to the mold opening direction, and are commonly found in industries such as automotive chassis parts, heavy machinery structural parts, and architectural hardware.

[0003] In existing side punching mechanisms, the punch is usually fixed directly to the flat mounting surface of the slide block by screws and pins. There is a lack of effective auxiliary positioning and impact-resistant reinforcement structures. Under long-term high-intensity punching loads, the fixing screws and pins are prone to loosening, deformation or even breakage due to excessive shearing force, resulting in slight displacement or lateral offset of the punch. This not only seriously affects the positional accuracy of punching and product quality, but also accelerates the wear of mold components and shortens the service life of the mold. Therefore, there is an urgent need for a side punch fixing structure that can enhance connection strength, prevent lateral offset and is suitable for thick material processing. Utility Model Content

[0004] This utility model overcomes the shortcomings of the prior art and provides a fixing structure for the side punch of thick sheet metal.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a side punch fixing structure for thick sheet metal, comprising: a side punch wedge mechanism, a side punch slider assembly that slides with and is driven by the side punch wedge mechanism, and a side punch punch that is detachably mounted on the stamping end face of the side punch slider assembly.

[0006] The side-impact wedge mechanism includes: a wedge drive seat disposed at the bottom of the side-impact wedge mechanism, and a reset hook disposed on the top surface of the side-impact wedge mechanism;

[0007] The side punch slider assembly includes: a punch mounting seat disposed at the front end of the side punch slider assembly, self-lubricating guide plates disposed on both sides of the side punch slider assembly, and a convex reinforcing positioning rib integrally formed on the end face of the punch mounting seat;

[0008] The side punch includes: a concave embedded reinforcing groove disposed at the rear end of the side punch base, and a plurality of fixed countersunk holes and positioning pin holes formed on the side punch base and penetrating the side punch.

[0009] The side punch is locked onto the side punch slider assembly by a fixing screw passing through the fixing countersunk hole and a locating pin passing through the locating pin hole.

[0010] In a preferred embodiment of this utility model, the convex reinforcing positioning rib extends vertically along the direction perpendicular to the stamping direction, and its cross-sectional shape is one of rectangle, trapezoid or dovetail; the depth of the concave embedded reinforcing groove is greater than or equal to the height of the convex reinforcing positioning rib.

[0011] In a preferred embodiment of the present invention, the side punching slider assembly is further provided with a receiving cavity for accommodating an elastic element. A high-pressure nitrogen spring is installed in the receiving cavity, and the elastic force direction of the high-pressure nitrogen spring is opposite to the punching direction of the side punching slider assembly.

[0012] In a preferred embodiment of this utility model, the side punch is made of SKD11 high-carbon high-chromium alloy tool steel.

[0013] In a preferred embodiment of this invention, solid lubricant particles are distributed on the working inclined surface of the wedge drive seat.

[0014] In a preferred embodiment of this utility model, the number of fixing screws is at least four, which are distributed in a rectangular array at the four corners of the side punch.

[0015] In a preferred embodiment of this invention, the number of positioning pins is at least two.

[0016] In a preferred embodiment of this utility model, the side punch wedge mechanism and the side punch slider assembly are both mounted on a lower die base, and a high-hardness wear-resistant pad is embedded in the lower die base corresponding to the lower part of the side punch slider assembly.

[0017] In a preferred embodiment of this utility model, an anti-lateral offset guide structure is further provided between the side-impact slider assembly and the side-impact wedge mechanism.

[0018] This utility model solves the defects existing in the background technology, and has the following beneficial effects:

[0019] (1) This utility model sets an integrally formed convex reinforcing positioning rib at the front end of the side punch slider assembly, and cooperates with the concave embedded reinforcing groove opened at the rear end of the side punch die base. At the same time, it is locked with fixing screws and positioning pins. The connection between the side punch die and the side punch slider assembly is changed from the traditional pure frictional force connection to mechanical embedded connection. The solid mating surface of the convex reinforcing positioning rib and the concave embedded reinforcing groove directly bears the huge shear force and impact force during the punching process. This solves the problem that the existing technology relies only on screws and pins to fix on the flat mounting surface, which is easy to cause the fixing parts to loosen, deform or even break due to excessive force. This ensures the stamping accuracy of the side punch die under long-term high load conditions and extends the service life of the die as a whole.

[0020] (2) This utility model utilizes the geometric feature of the convex reinforcing positioning rib extending vertically perpendicular to the stamping direction, and the dimensional fit of the concave embedded reinforcing groove depth being greater than or equal to the height of the convex reinforcing positioning rib, to achieve complete restriction of the side punch in lateral degree of freedom. When a huge reverse draft force and lateral component force are generated during the punching of thick material, the stress is uniformly transmitted to the body of the side punch slider assembly through the side wall of the concave embedded reinforcing groove, rather than being concentrated on the rod of the fixing screw. Compared with the defects of the punch in the prior art that is prone to slight displacement or lateral offset, this utility model enhances the shear resistance through this embedded reinforcing structure, ensures the installation position accuracy of the side punch, and avoids the risk of product scrap and mold damage caused by punch offset.

[0021] (3) The present invention is provided with a reset hook on the side punch wedge mechanism and a high-pressure nitrogen spring with the elastic force direction opposite to the punching direction is installed in the internal cavity of the side punch slider assembly. The huge elastic force released by the high-pressure nitrogen spring is used as the initial unloading force, and the reset hook is used to force the side punch slider assembly to retract by the return force of the press, which ensures that the side punch punch can be reliably pulled out from the thick sheet metal with a huge clamping force. Compared with the existing technology, it is often difficult to overcome the friction of the thick plate by simply relying on the ordinary spring force, which leads to the mold jamming or the screw breaking. The present invention improves the safety and production efficiency of the thick plate side punching process and reduces the downtime maintenance time caused by the mold jamming.

[0022] (4) This utility model provides a lateral offset guide structure between the side punch slider assembly and the side punch wedge mechanism, and with the self-lubricating guide plates on both sides and the high-hardness wear-resistant pads embedded on the lower die base, it provides a precise linear trajectory constraint when the side punch slider assembly is subjected to heavy-load reciprocating motion, and uses solid lubricant particles to reduce the coefficient of friction. Compared with the problem that the slider directly contacts the die base and friction easily causes the reference surface to wear out and become inaccurate in the prior art, this utility model ensures the consistency of the punching position during long-term production, and makes the side punch slider assembly run more smoothly and maintenance easier. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0024] Figure 1 This is a perspective structural diagram of a preferred embodiment of the present invention;

[0025] Figure 2 This is an exploded view of a preferred embodiment of the present invention;

[0026] Figure 3 This is a partial cross-sectional view of a preferred embodiment of the present invention;

[0027] In the diagram: 1. Side punch wedge mechanism; 2. Side punch slider assembly; 3. Side punch punch; 4. Fixing screw; 5. Locating pin; 6. High-pressure nitrogen spring; 11. Wedge drive seat; 12. Reset hook; 21. Punch mounting seat; 22. Self-lubricating guide plate; 23. Convex reinforcing locating rib; 31. Concave embedded reinforcing groove; 32. Fixing countersunk hole; 33. Locating pin hole; 34. Lower die base; 41. Anti-lateral offset guide structure; 42. High-hardness wear-resistant pad. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0029] like Figures 1-3 As shown, both the side-punch wedge mechanism 1 and the side-punch slider assembly 2 are mounted on a lower die base 34. The lower die base 34, as the basic support component of the entire mechanism, is typically made of high-strength cast iron or cast steel to ensure sufficient rigidity and shock absorption. Below the lower die base 34 corresponding to the side-punch slider assembly 2, a high-hardness wear-resistant pad 42 is specially inlaid to prevent damage to the reference surface of the lower die base 34 during long-term reciprocating sliding friction. The high-hardness wear-resistant pad 42 is typically made of high-carbon, high-chromium steel that has undergone quenching treatment. The bottom surface of the side-punch slider assembly 2 directly contacts and slides relative to the upper surface of the high-hardness wear-resistant pad 42, thereby ensuring the smoothness and precision retention of the movement trajectory of the side-punch slider assembly 2.

[0030] To further constrain the movement trajectory of the side punch slider assembly 2 and prevent it from swaying due to lateral forces during the punching process, an anti-lateral offset guide structure 41 is provided between the guide mating surfaces of the side punch slider assembly 2 and the side punch wedge mechanism 1, or between the side punch slider assembly 2 and the side wall of the lower die base 34. The anti-lateral offset guide structure 41 is in the form of a lateral stop; in this embodiment, a rectangular guide rail structure is preferably adopted, which restricts the degree of freedom of the side punch slider assembly 2 in the horizontal direction perpendicular to the punching direction through precise fitting clearances.

[0031] In this invention, the side-punch wedge mechanism 1 is the power input end, and its function is to convert the vertical downward movement of the press slide into a horizontal driving force. Specifically, the side-punch wedge mechanism 1 includes a wedge drive seat 11 disposed at the bottom of the side-punch wedge mechanism 1, and a reset hook 12 disposed on the top surface of the side-punch wedge mechanism 1. The wedge drive seat 11 is typically fastened to the lower die seat 34 by screws or installed on the upper die seat as a lifting wedge. The wedge drive seat 11 has a working inclined surface at a certain angle to the horizontal plane. To reduce the coefficient of friction, reduce energy loss and heat generation, solid lubricant particles are distributed on the working inclined surface of the wedge drive seat 11. These particles are typically high-purity graphite columns embedded in a metal matrix, forming an extremely thin lubricating film during operation.

[0032] In this invention, the reset hook 12 is disposed on the top or side surface of the side punch wedge mechanism 1, and its structural form is a high-strength alloy steel hook-shaped component. The function of the reset hook 12 is that when the stamping operation is completed and the press slide moves upward, the reset hook 12 can forcibly hook onto the cooperating drive block, using the press's return force to forcibly pull or assist the side punch slide assembly 2 back to its initial position. This is particularly important in thick-material punching, because the clamping force after punching thick material is extremely large, and spring force alone is often insufficient to pull the side punch punch 3 out of the sheet metal; the forced mechanical ejection force provided by the reset hook 12 is necessary.

[0033] In this invention, the side punch slider assembly 2 is the core component for transmitting force. It supports the side punch punch 3 and reciprocates along the guiding direction. The side punch slider assembly 2 includes: a punch mounting base 21 disposed at the front end of the side punch slider assembly 2, and self-lubricating guide plates 22 disposed on both sides of the side punch slider assembly 2. The self-lubricating guide plates 22 are symmetrically installed on both sides of the side punch slider assembly 2, and are made of high-strength brass with graphite inlay, and are fixed to the slider body by screws. The self-lubricating guide plates 22 cooperate with external guide grooves to guide the linear movement of the side punch slider assembly 2 and bear the lateral force during the punching process.

[0034] In this invention, the punch mounting base 21 is located at the foremost end of the side punch slider assembly 2. Traditional slider front ends are typically flat planes, relying solely on screw holes and pin holes to fix the punch. In this invention, a protruding solid rib, namely the convex reinforcing positioning rib 23, is retained or formed on the vertical end face of the punch mounting base 21 through precision milling.

[0035] In this invention, the convex reinforcing positioning rib 23 extends vertically perpendicular to the stamping direction, penetrating or partially penetrating the end face of the punch mounting base 21. The convex reinforcing positioning rib 23 and the punch mounting base 21 are integrally machined from the same material, not added later by welding or screws, thus possessing extremely high structural strength and shear resistance. The cross-sectional shape of the convex reinforcing positioning rib 23 is preferably rectangular, because rectangular mating surfaces are easy to machine and have a clear positioning reference.

[0036] In this invention, the side punch slider assembly 2 also has a receiving cavity for accommodating an elastic element. A high-pressure nitrogen spring 6 is installed in the receiving cavity. The high-pressure nitrogen spring 6 is a novel elastic component that uses high-pressure nitrogen as its working medium. The installation position of the high-pressure nitrogen spring 6 ensures that its elastic force direction is opposite to the punching direction of the side punch slider assembly 2. When the side punch slider assembly 2 moves forward to punch, the high-pressure nitrogen spring 6 is compressed and stores energy; when punching is completed and the external force is removed, the high-pressure nitrogen spring 6 releases a huge elastic force, pushing the side punch slider assembly 2 to return to its original position. In thick material punching, this elastic force also serves as the initial unloading force, helping the side punch punch 3 to loosen the clamped sheet metal.

[0037] In this invention, the side punch 3 is a tool steel component that directly contacts the sheet metal and performs the punching operation. Since the punching object is thick sheet metal, the side punch 3 must possess extremely high hardness and toughness. The side punch 3 is preferably made of SKD11 high-carbon, high-chromium alloy tool steel and undergoes vacuum heat treatment and cryogenic treatment, with the hardness controlled between HRC60 and 62 to ensure its wear resistance and anti-cracking properties.

[0038] In this invention, the side punch 3 includes a concave reinforcing groove 31 located at the rear end of the side punch 3 base, and several countersunk holes 32 and locating pin holes 33 formed on the side punch 3 base and penetrating the side punch 3. The concave reinforcing groove 31 is a key feature that cooperates with the convex reinforcing locating rib 23 on the side punch slider assembly 2. The concave reinforcing groove 31 is located on the back side of the side punch 3, and its shape and width closely match the convex reinforcing locating rib 23. The depth of the concave reinforcing groove 31 is designed to be greater than or equal to the height of the convex reinforcing locating rib 23. To ensure a tight fit, the depth of the concave reinforcing groove 31 is slightly deeper than the height of the convex reinforcing locating rib 23 by 0.5mm to 1mm, ensuring that the back side of the side punch 3 can completely fit against the end face of the punch mounting base 21, rather than pressing against the top of the rib.

[0039] In this invention, when the side punch 3 is mounted on the side punch slider assembly 2, the convex reinforcing positioning rib 23 is fully embedded in the concave embedding reinforcing groove 31. At this time, the side punch 3's degree of freedom in the horizontal lateral direction is completely restricted. During the stamping process, if a lateral force is generated, this lateral force will be directly transmitted to the convex reinforcing positioning rib 23 through the side wall of the concave embedding reinforcing groove 31, that is, directly transmitted to the body of the side punch slider assembly 2.

[0040] In this invention, the countersunk hole 32 is formed on the front side of the side punch 3 and extends to the back side. The countersunk hole 32 is used to accommodate the head of the fixing screw 4, preventing it from protruding from the die surface. There are at least four fixing screws 4, arranged in a rectangular array at the four corners of the side punch 3. This corner distribution provides the most stable clamping force, preventing the side punch 3 from warping. After passing through the countersunk hole 32, the fixing screw 4 is screwed into the corresponding threaded hole on the punch mounting base 21, tightly pulling the side punch 3 towards the side punch slider assembly 2 along the stamping direction.

[0041] In this invention, the positioning pin hole 33 also penetrates the side punch 3 and is used to install the positioning pin 5. The number of positioning pins 5 is at least two, typically arranged diagonally or vertically. The positioning pin 5 passes through the positioning pin hole 33 and is pressed into the pin hole of the punch mounting base 21. Although this invention has a concave-convex reinforcement structure, the positioning pin 5 is still essential for precise vertical positioning, ensuring the vertical positioning accuracy of the side punch 3.

[0042] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A side punch fixing structure for thick sheet metal, comprising: The side punch wedge mechanism (1), the side punch slider assembly (2) which slides with and is driven by the side punch wedge mechanism (1), and the side punch punch (3) which is detachably mounted on the stamping end face of the side punch slider assembly (2), characterized in that: The side-impact wedge mechanism (1) includes: a wedge drive seat (11) disposed at the bottom of the side-impact wedge mechanism (1), and a reset hook (12) disposed on the top surface of the side-impact wedge mechanism (1). The side punch slider assembly (2) includes: a punch mounting base (21) disposed at the front end of the side punch slider assembly (2), self-lubricating guide plates (22) disposed on both sides of the side punch slider assembly (2), and a convex reinforcing positioning rib (23) integrally formed on the end face of the punch mounting base (21). The side punch (3) includes: a concave embedded reinforcing groove (31) provided at the rear end of the side punch (3) base, and a plurality of fixed countersunk holes (32) and positioning pin holes (33) opened on the side punch (3) base and penetrating the side punch (3). The side punch (3) is locked onto the side punch slider assembly (2) by a fixing screw (4) that passes through the fixing countersunk hole (32) and a positioning pin (5) that passes through the positioning pin hole (33).

2. The side punch fixing structure for thick sheet metal as described in claim 1, characterized in that: The convex reinforcing positioning rib (23) extends vertically along the stamping direction, and its cross-sectional shape is one of rectangle, trapezoid or dovetail; the depth of the concave embedded reinforcing groove (31) is greater than or equal to the height of the convex reinforcing positioning rib (23).

3. The side punch fixing structure for thick sheet metal according to claim 1, characterized in that: The side punching slider assembly (2) also has a receiving cavity for accommodating elastic elements. A high-pressure nitrogen spring (6) is installed in the receiving cavity. The elastic force direction of the high-pressure nitrogen spring (6) is opposite to the punching direction of the side punching slider assembly (2).

4. The side punch fixing structure for thick sheet metal according to claim 1, characterized in that: The side punch (3) is made of SKD11 high carbon high chromium alloy tool steel.

5. The side punch fixing structure for thick sheet metal according to claim 1, characterized in that: Solid lubricant particles are distributed on the working inclined surface of the wedge drive seat (11).

6. The side punch fixing structure for thick sheet metal according to claim 1, characterized in that: The number of fixing screws (4) is at least four, and they are arranged in a rectangular array at the four corners of the side punch (3).

7. The side punch fixing structure for thick sheet metal according to claim 1, characterized in that: The number of the positioning pins (5) is at least two.

8. The side punch fixing structure for thick sheet metal according to claim 1, characterized in that: The side punch wedge mechanism (1) and the side punch slider assembly (2) are both installed on a lower mold base (34). The lower mold base (34) is inlaid with a high hardness wear-resistant pad (42) below the side punch slider assembly (2).

9. The side punch fixing structure for thick sheet metal according to claim 1, characterized in that: A lateral offset guide structure (41) is also provided between the side-impact slider assembly (2) and the side-impact wedge mechanism (1).

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