Punch structure, cutting tool and blanking die

Abstract

The utility model discloses a punch structure, cutting tool and punch die relates to tensile cutting technical field. Among them, punch structure includes punch main part and punch head, and punch head is located at one side of punch main part, and punch head and punch main part coaxial arrangement, and the outer diameter of punch head is less than the outer diameter of punch main part, and the joint part of punch head and punch main part is first camber surface, and first camber surface is used for with the inner peripheral edge of through -hole and is in conformity. The utility model provides technical scheme to eliminate the gap of punch structure and workpiece, improves the punch quality of workpiece.

Description

Technical Field

[0001] This utility model relates to the field of stretch cutting technology, and in particular to a punch structure, a cutting tool and a punching die. Background Technology

[0002] In modern manufacturing, stretch cutting is widely used in the production of various parts, especially in the automotive, electronics, and machinery industries. However, with the increasing precision requirements of workpieces, traditional blanking structures are gradually revealing some problems that urgently need to be addressed.

[0003] Currently, the punch and cutting edge direct blanking structure is a common blanking method, which can quickly complete the workpiece cutting. As the key component of blanking, the shape and size of the punch directly affect the cutting effect. The cutting edge plays the role of cutting the material, and its sharpness and precision determine the quality of the cut edge.

[0004] However, in existing punches, a gap exists between the punch body and the workpiece at the connection point when the punch head enters the workpiece. During the straight punching process, as the blanking force increases, the material flow of the workpiece fills this gap, resulting in a discontinuity after the workpiece is punched. During the workpiece's necking process, this discontinuity can scrape off the electroplated layer, causing functional failure of the workpiece; furthermore, this discontinuity can also affect the accuracy of the workpiece's assembly with other components. Utility Model Content

[0005] The main purpose of this utility model is to propose a punch structure, a cutting tool and a punching die, which aims to eliminate the gap between the punch structure and the workpiece and improve the punching quality of the workpiece.

[0006] To achieve the above objectives, the present invention proposes a punch structure for stamping workpieces, wherein the workpieces have through holes, including:

[0007] Punch body; and

[0008] A punch is disposed on one side of the punch body. The punch and the punch body are coaxially arranged, and the outer diameter of the punch is smaller than the outer diameter of the punch body. The part where the punch and the punch body meet is a first arc surface, which is used to fit against the inner peripheral edge of the through hole.

[0009] In one embodiment, the radius of the first arc surface is greater than or equal to 0.4 mm and less than or equal to 0.6 mm.

[0010] In one embodiment, the punch and the punch body are integrally formed.

[0011] In one embodiment, both the punch and the punch body are hollow.

[0012] In one embodiment, the outer periphery of the punch body facing the punch head is provided with a first cutting surface, which is used to cut the inner periphery of the through hole.

[0013] In one embodiment, the punch is configured to conform to the structure of the through hole so that the outer periphery of the punch fits against the inner wall of the through hole.

[0014] In one embodiment, the outer periphery of the end of the punch away from the punch body is provided with a slope, and the slope is inclined toward the axis of the punch body in the direction away from the punch body; or

[0015] The outer periphery of the punch away from the punch body is provided with a second arc surface.

[0016] This utility model also proposes a cutting tool for cooperating with the punch structure described in any of the above embodiments to punch the workpiece off the strip, comprising:

[0017] The blade body is hollow and has a second cutting edge on its inner periphery. The second cutting edge is inclined relative to the axis of the blade body.

[0018] In one embodiment, the tilt angle of the second cutting edge is greater than or equal to 1 degree and less than or equal to 3 degrees.

[0019] This utility model also proposes a punching die, including the punch structure and the cutting tool described in any of the above embodiments.

[0020] The technical solution of this utility model involves a punch structure used to stamp a workpiece with a through hole. The punch structure includes a punch body and a punch head, with the punch head located on one side of the punch body. The punch head and punch body are coaxially aligned, and the outer diameter of the punch head is smaller than the outer diameter of the punch body. The contact portion between the punch head and the punch body is a first arc surface, which is used to fit against the inner peripheral edge of the through hole. Compared to existing punches that have gaps with the workpiece, the technical solution of this utility model provides a first arc surface at the contact portion between the punch head and the punch body. This first arc surface achieves a smooth transition between the punch head and the punch body. When the punch head is fully inserted into the through hole, the first arc surface can completely fit against the inner peripheral edge of the through hole, thus restricting the flow of workpiece material and ensuring no residual defects after punching. In this way, the first arc surface eliminates the gap between the punch structure and the workpiece, improving the punching quality of the workpiece. Attached Figure Description

[0021] 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 the structures shown in these drawings without creative effort.

[0022] Figure 1 A cross-sectional view of an embodiment of the punch structure and cutting tool provided by this utility model, wherein the workpiece is an unpunched workpiece;

[0023] Figure 2 for Figure 1 An enlarged view of an embodiment at point A;

[0024] Figure 3 for Figure 1 An enlarged view of another embodiment at point A, wherein the workpiece is a workpiece that has been punched;

[0025] Figure 4 A schematic diagram of an embodiment of the punch structure provided by this utility model;

[0026] Figure 5 for Figure 1 An exploded view of one embodiment.

[0027] Explanation of icon numbers:

[0028] 100. Punch structure; 110. Punch body; 111. First cutting edge; 120. Punch head; 121. Second arc surface; 130. First arc surface;

[0029] 200. Cutting tool; 210. Tool body; 220. Second cutting edge;

[0030] 300, workpiece; 310, through hole.

[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] 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 scope of protection of the present utility model.

[0033] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0034] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] In modern manufacturing, stretch cutting is widely used in the production of various metal parts, especially in the automotive, electronics, and machinery industries. However, with the increasing precision requirements of workpieces, traditional blanking structures are gradually revealing some problems that urgently need to be addressed.

[0036] Currently, the punch and cutting edge direct blanking structure is a common blanking method, which can quickly complete the workpiece cutting. As the key component of blanking, the shape and size of the punch directly affect the cutting effect. The cutting edge plays the role of cutting the material, and its sharpness and precision determine the quality of the cut edge.

[0037] However, in existing punches, a gap exists between the punch body and the workpiece at the connection point when the punch head enters the workpiece. During the straight punching process, as the blanking force increases, the material flow of the workpiece fills this gap, resulting in a discontinuity after the workpiece is punched. During the workpiece's necking process, this discontinuity can scrape off the electroplated layer, causing functional failure of the workpiece; furthermore, this discontinuity can also affect the accuracy of the workpiece's assembly with other components.

[0038] This invention proposes a punch structure to eliminate the gap between the punch structure and the workpiece, thereby improving the punching quality of the workpiece.

[0039] Please see Figures 1 to 4In one embodiment, the punch structure 100 includes a punch body 110 and a punch head 120. The punch head 120 is disposed on one side of the punch body 110. The punch head 120 and the punch body 110 are coaxially arranged, and the outer diameter of the punch head 120 is smaller than the outer diameter of the punch body 110. The contact portion between the punch head 120 and the punch body 110 is a first arc surface 130, which is used to fit against the inner peripheral edge of the through hole 310.

[0040] The punch structure 100 is used to punch the workpiece 300, which has a through hole 310 to allow the punch structure 100 to extend into the workpiece 300 to perform the punching operation. The workpiece 300 can be a component made of metal, plastic, or composite materials, etc., and there are no restrictions on this.

[0041] The punch body 110 is the main structure of the punch structure 100. In one embodiment, one end of the punch body 110 is used for driving connection with a drive structure, which drives the punch body 110 to move along its own axis toward or away from the workpiece 300. The drive structure may include a power component and transmission components such as gears or connecting rods, or it may only include a power component, which may be configured as a cylinder, motor, or hydraulic cylinder, etc., without limitation. In one embodiment, a buffer structure is also provided at the end of the punch body 110 connected to the drive structure. The buffer structure is used to reduce the impact force received by the punch body 110, so that the punch structure 100 operates smoothly. The buffer structure may include a spring, silicone, or porous elastomer, etc., without limitation.

[0042] The punch 120 is a key structure for the punch structure 100 to perform the stamping operation. In one embodiment, the punch 120 is located at the end of the punch body 110 away from the drive structure, and the punch body 110 and the punch 120 move synchronously. The axis of the punch 120 coincides with the axis of the punch body 110, and the outer diameter of the punch 120 is smaller than the outer diameter of the punch body 110, so that there is a gap between the outer periphery of the punch body 110 and the outer periphery of the punch 120, so as to facilitate the setting of the first arc surface 130. The contact portion between the punch 120 and the punch body 110 is set as the first arc surface 130, so that the outer peripheral surface of the punch 120 can smoothly transition to the end face of the punch body 110. In one embodiment, the inner diameter of the through hole 310 is slightly larger than the outer diameter of the punch 120 and smaller than the outer diameter of the punch body 110, to ensure that the punch 120 can extend into the workpiece 300 and fit against the inner wall of the through hole 310, the first arc surface 130 fits against the inner peripheral edge of the through hole 310, and the outer peripheral end of the punch body 110 can abut against the outer wall of the through hole 310 to achieve stamping. The outer diameters of both the punch 120 and the punch body 110 can be flexibly set according to the inner diameter of the through hole 310, and are not limited here.

[0043] The technical solution of this utility model is that the punch structure 100 is used to punch the workpiece 300. The workpiece 300 has a through hole 310. The punch structure 100 is provided with a punch body 110 and a punch 120. The punch 120 is located on one side of the punch body 110. The punch 120 and the punch body 110 are coaxially arranged, and the outer diameter of the punch 120 is smaller than the outer diameter of the punch body 110. The contact part between the punch 120 and the punch body 110 is a first arc surface 130. The first arc surface 130 is used to fit against the inner peripheral edge of the through hole 310. Compared to existing punches that have gaps with the workpiece 300, the present invention provides a first arc surface 130 at the junction of the punch 120 and the punch body 110. The first arc surface 130 achieves a smooth transition between the punch 120 and the punch body 110. When the punch 120 is fully inserted into the through hole 310, the first arc surface 130 can completely fit against the inner circumferential edge of the through hole 310, thereby restricting the flow of material in the workpiece 300 and ensuring that there are no residual defects after the workpiece 300 is punched. Thus, the first arc surface 130 eliminates the gap between the punch structure 100 and the workpiece 300, improving the punching quality of the workpiece 300.

[0044] In one embodiment, the radius of the first arc surface 130 is greater than or equal to 0.4 mm and less than or equal to 0.6 mm.

[0045] This size range avoids situations where the radius of the first arc surface 130 is too small, which would affect the restriction effect on the material flow of the workpiece 300, causing the material of the workpiece 300 to easily accumulate at the first arc surface 130, affecting the uniformity of punching; conversely, it avoids situations where the radius of the first arc surface 130 is too large, which would affect the smooth transition between the punch 120 and the punch body 110, or even prevent the punch 120 from extending into the workpiece 300, and the first arc surface 130 and the inner peripheral edge of the through hole 310 could not be completely fitted, resulting in uneven material flow in the workpiece 300 and limited restriction effect. In one embodiment, the first arc surface 130 is provided in a circle around the axis of the punch 120, and the radius of the first arc surface 130 is approximately 0.5 mm. Of course, in other embodiments, the radius of the first arc surface 130 can also be set to 0.4 mm or 0.6 mm, etc., and is not limited here.

[0046] The technical solution of this utility model embodiment, by limiting the radius of the first arc surface 130, ensures that the first arc surface 130 can effectively restrict the material flow of the workpiece 300, thereby improving the stamping reliability.

[0047] Please see Figures 1 to 3 In one embodiment, the punch 120 and the punch body 110 are integrally formed.

[0048] In one embodiment, the contact portion between the punch 120 and the punch body 110 is integrally formed into a first arc surface 130, avoiding the connection gap that would result from separately setting the first arc surface 130 later. Of course, in other embodiments, the punch 120 and the punch body 110 can also be separately configured, with the punch body 110 and punch 120 being detachably or fixedly connected. The first arc surface 130 is located on the outer periphery of the end of the punch 120 near the punch body 110, but it is necessary to ensure that the contact surfaces of the punch 120 and the punch body 110 can achieve complete fit; however, this is not a limitation. The punch 120 and the punch body 110 can be made of materials with high wear resistance and hardness, such as high-speed steel, cemented carbide, or alloy steel; this is not a limitation either.

[0049] The technical solution of this utility model embodiment improves the overall structural stability of the punch structure 100 by integrally molding the punch 120 and the punch body 110, and further ensures the smooth transition of the part where the punch 120 and the punch body 110 meet.

[0050] Please see Figure 1 In one embodiment, both the punch 120 and the punch body 110 are hollow.

[0051] In one embodiment, the punch structure 100 has a hollow channel throughout, which extends through the punch head 120 and the punch body 110. In another embodiment, the punch head 120 has a first hollow channel, and the punch body 110 has a second hollow channel, which are coaxially arranged. One end of the punch head 120 facing the punch body 110 has an extension portion located within the second hollow channel, connecting the first and second hollow channels. Of course, in other embodiments, only the punch head 120 may be hollow; this is not a limitation.

[0052] The technical solution of this utility model embodiment, by hollowing out the punch 120 and the punch body 110, on the one hand, reduces the weight of the punch structure 100 and can disperse the stress on the punch structure 100, thereby improving the reliability of the punch structure 100; on the other hand, during stamping, the hollow channel can connect the external environment with the through hole 310 to allow air to circulate, thereby preventing the workpiece 300 from being adsorbed onto the punch 120.

[0053] Please see Figure 4 In one embodiment, the outer periphery of the punch body 110 facing the punch head 120 is provided with a first cutting surface 111, which is used to cut the inner periphery edge of the through hole 310.

[0054] In one embodiment, the first cutting edge 111 is disposed around the outer periphery of the first arc surface 130 near the end of the punch body 110, and the first cutting edge 111 is disposed away from the punch body 110 so that the punch 120 extends into the through hole 310. When the first arc surface 130 is in contact with the inner periphery of the through hole 310, the first cutting edge 111 can cut the end of the through hole 310 that is in contact with the first arc surface 130.

[0055] The technical solution of this utility model embodiment, by setting the first cutting edge 111, enables the punch structure 100 to cut the workpiece 300 while punching it, thereby expanding the functionality of the punch structure 100.

[0056] Please see Figures 1 to 4 In one embodiment, the punch 120 is configured to conform to the structure of the through hole 310 so that the outer periphery of the punch 120 fits against the inner wall of the through hole 310.

[0057] In one embodiment, the shape of the outer peripheral surface of the punch 120 matches the shape of the inner peripheral surface of the through hole 310, so that when the punch 120 extends into the through hole 310, it completely fits against the inner wall of the through hole 310, further restricting the flow of material in the workpiece 300 and ensuring the stability of the stamping process. In one embodiment, the cross-sectional shape of the through hole 310 is circular, and the punch 120 and the punch body 110 are correspondingly set as cylindrical structures. Of course, in other embodiments, the cross-sectional shape of the through hole 310 can also be rectangular, elliptical, or other regular shapes, with the punch 120 and the punch body 110 correspondingly set; no limitation is made here.

[0058] In one embodiment, the outer periphery of the end of the punch 120 away from the punch body 110 is provided with a slope (not shown in the figure). The slope is inclined towards the axis of the punch body 110 in the direction away from the punch body 110, such that the side dimension of the punch 120 facing the workpiece 300 is smaller than the side dimension of the punch 120 facing the punch body 110. The inclination angle of the slope can be flexibly set according to actual needs and is not limited here.

[0059] In another embodiment, a second arc surface 121 is provided on the outer periphery of the side of the punch 120 away from the punch body 110. The bending direction of the second arc surface 121 is opposite to the bending direction of the first arc surface 130. The second arc surface 121 allows for a smooth transition between the side of the punch 120 facing the workpiece 300 and the outer periphery of the punch 120, and makes the dimension of the side of the punch 120 facing the workpiece 300 smaller than the dimension of the side of the punch 120 facing the punch body 110. The radius of the second arc surface 121 can be flexibly set according to actual needs, and is not limited here.

[0060] The technical solution of this utility model embodiment, by setting the punch 120 in a contoured manner, further restricts the material flow of the workpiece 300, thereby improving stamping accuracy and stamping quality. By setting the inclined surface or the second arc surface 121, the punch 120 can be guided into the through hole 310, improving the ease of use of the punch structure 100.

[0061] This utility model also proposes a cutting tool 200, which is used to cooperate with the punch structure 100 of the above embodiments to punch the workpiece 300 off the strip.

[0062] The workpiece 300 involved here is placed on a strip (not shown in the figure). Multiple workpieces 300 are spaced apart on the strip, and the top periphery of each workpiece 300 is connected to the strip, that is, the outer periphery of the through hole 310 is connected to the strip. The punch structure 100 and the cutting tool 200 are respectively placed on the upper and lower sides of the strip. A punching position is formed between the punch structure 100 and the cutting tool 200. When the workpiece 300 on the strip moves to the punching position, the punch 120 of the punch structure 100 extends into the through hole 310 of the workpiece 300 to press the workpiece 300 down to the cutting tool 200, so as to punch the workpiece 300 out of the strip.

[0063] Please see Figure 1 and Figure 5 In one embodiment, the cutting tool 200 includes a blade body 210, which is hollow and has a second cutting surface 220 on its inner periphery. The second cutting surface 220 is inclined relative to the axis of the blade body 210.

[0064] In one embodiment, the blade body 210 is hollow to form a cutting hole, which is coaxially arranged with the punch structure 100. The inner diameter of the cutting hole is slightly larger than the outer diameter of the workpiece 300, so that the workpiece 300 can enter the cutting hole and the outer wall of the workpiece 300 fits against the inner wall of the cutting hole. A second cutting surface 220 is provided on the inner periphery of the end of the cutting hole near the punch structure 100. The second cutting surface 220 is inclined in the direction away from the axis of the blade body 210 in the direction near the punch structure 100, so as to ensure that the cutting tool 200 only cuts the connection between the workpiece 300 and the strip. In one embodiment, the blade body 210 is fixed to the operating platform and located below the punch structure 100. Of course, in other embodiments, the blade body 210 can also be driven by a driving component, which drives the blade body 210 to rise or rotate. The driving component can be a motor or a cylinder, etc., and there is no limitation here.

[0065] In one embodiment, the inclination angle of the second cutting edge 220 is greater than or equal to 1 degree and less than or equal to 3 degrees.

[0066] This angle range avoids both excessively small tilt angles, which could cause damage to other parts of the workpiece 300 when the punch structure 100 presses the workpiece 300 down into the cutting hole, and excessively large tilt angles, which could prevent accurate cutting of the connection between the workpiece 300 and the strip, resulting in residual defects in the workpiece 300 after punching. The specific tilt angle of the second cutting surface 220 relative to the axis of the cutter body 210 can be flexibly set according to actual needs, as long as the tilt angle is between 1 degree and 3 degrees; no restrictions are imposed here.

[0067] Please see Figure 1 and Figure 5 When workpiece 300 needs to be punched, punch 120 of punch structure 100 extends into through hole 310, and punch structure 100 presses down workpiece 300, so that the inner periphery of through hole 310 is in contact with first arc surface 130 and the workpiece 300 is pressed down into the cutting hole. In one embodiment, first cutting surface 111 contacts the end of through hole 310 that contacts first arc surface 130, and first arc surface 130 pushes against the inner periphery of through hole 310 so that the outer periphery of through hole 310 contacts second cutting surface 220. First cutting surface 111 and second cutting surface 220 cooperate to cut the workpiece 300 at the connection with the strip, thereby realizing the punching and blanking of workpiece 300. In another embodiment, the outer periphery of the punch body 110 contacts the end of the through hole 310 that contacts the first arc surface 130. The first arc surface 130 and the outer periphery of the punch body 110 together press the outer periphery of the through hole 310 against the second cutting surface 220, so that the second cutting surface 220 cuts the connection between the workpiece 300 and the strip.

[0068] The technical solution of this utility model embodiment, by providing an inclined second cutting surface 220 on the cutting tool 200, can cooperate with the first arc surface 130 and the first cutting surface 111 of the punch structure 100 to accurately punch the connection between the workpiece 300 and the strip, ensuring that the outer circumferential surface of the punched workpiece 300 has no discontinuity and improving the punching quality. By limiting the inclination angle of the second cutting surface 220, it is ensured that the second cutting surface 220 can accurately cut the workpiece 300, improving the reliability and accuracy of punching.

[0069] This utility model also proposes a blanking die, including a punch structure 100 and a cutting tool 200 as described in the above embodiments. The specific structures of the punch structure 100 and the cutting tool 200 are as described in the above embodiments. Since this blanking die adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0070] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A punch structure for punching a workpiece, the workpiece having a through hole, characterized in that, include: Punch body; and A punch is disposed on one side of the punch body. The punch and the punch body are coaxially arranged, and the outer diameter of the punch is smaller than the outer diameter of the punch body. The part where the punch and the punch body meet is a first arc surface, which is used to fit against the inner peripheral edge of the through hole.

2. The punch structure as described in claim 1, characterized in that, The radius of the first arc surface is greater than or equal to 0.4 mm and less than or equal to 0.6 mm.

3. The punch structure as described in claim 1, characterized in that, The punch and the punch body are integrally formed.

4. The punch structure as described in claim 3, characterized in that, Both the punch head and the punch body are hollow.

5. The punch structure as described in claim 1, characterized in that, The outer periphery of the punch body facing the punch head is provided with a first cutting surface, which is used to cut the inner periphery edge of the through hole.

6. The punch structure as described in claim 1, characterized in that, The punch is configured to conform to the structure of the through hole so that the outer periphery of the punch fits against the inner wall of the through hole.

7. The punch structure as described in claim 6, characterized in that, The outer periphery of the end of the punch away from the punch body is provided with a slope, and the slope is inclined towards the axis of the punch body in the direction away from the punch body; or The outer periphery of the punch away from the punch body is provided with a second arc surface.

8. A cutting tool for cooperating with the punch structure according to any one of claims 1 to 7 to punch the workpiece off the strip, characterized in that, include: The blade body is hollow and has a second cutting edge on its inner periphery. The second cutting edge is inclined relative to the axis of the blade body.

9. The cutting tool as described in claim 8, characterized in that, The inclination angle of the second cutting edge is greater than or equal to 1 degree and less than or equal to 3 degrees.

10. A punching die, comprising a punch structure as described in any one of claims 1 to 7 and a cutting tool as described in any one of claims 8 to 9.

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