Punching die for U-shaped punching holes

Abstract

The present invention discloses a punching die for U-shaped punching holes, which relates to the technical field of forming dies; the punching die comprises an upper die assembly and a lower die assembly, wherein the lower die assembly is rotatably connected to a movable die, and the movable die is used to install a part with a U-shaped structure; the movable die can be rotated to a punching station and a waste flushing station; the punching station comprises an upper hole punch fixedly arranged on the upper die assembly, and a lower hole punch fixedly arranged on the lower die assembly, the upper hole punch and the lower hole punch being coaxially arranged; when the movable die rotates to the punching station, the upper hole punch and the lower hole punch are combined to synchronously punch the U-shaped two side plates of the part; when the movable die rotates to the waste flushing station, the hole waste embedded in the movable die is flushed out. The technical solution provided by the present invention can ensure the coaxiality of the holes on both sides and improve processing efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of forming dies, and in particular to a punching die used for U-shaped punching holes. Background Art

[0002] For parts with U-shaped structure such as the lever arm in the motorcycle clutch, both side plates of the U-shaped structure need to be punched to form U-shaped punching holes (such as the attached Figure 1 As shown in the figure); In the prior art, the general forming step is to punch the side panels separately, that is, punching one side panel first, and then punching the other side panel. This, on the one hand, easily leads to a difference in the coaxiality of the holes on both sides; on the other hand, the use of two punching processes leads to low processing efficiency. Summary of the Invention

[0003] The main purpose of the present invention is to provide a punching die for U-shaped punching holes, aiming to ensure the coaxiality of the holes on both sides and improve the processing efficiency.

[0004] To achieve the above-mentioned objectives, the present invention proposes a punching die for U-shaped punching holes, specifically, the punching die includes an upper die assembly and a lower die assembly, wherein the lower die assembly is rotatably connected to a movable die, and the movable die is used to install parts of the U-shaped structure; the movable die can be rotated to a punching station and a waste punching station; the punching station includes an upper hole punch fixedly arranged on the upper die assembly, and a lower hole punch fixedly arranged on the lower die assembly, and the upper hole punch and the lower hole punch are coaxially arranged; when the movable die rotates to the punching station, the upper hole punch is combined with the lower hole punch to synchronously punch the U-shaped two side plates of the part; when the movable die rotates to the waste punching station, the hole waste embedded in the movable die is flushed out.

[0005] In one embodiment, the upper mold assembly includes an upper mold plate, an upper pad, an upper fixed plate and a pressure plate arranged in sequence from top to bottom, wherein the upper mold plate, the upper pad and the upper fixed plate are fixedly connected in sequence, an upper floating gap is provided between the pressure plate and the upper fixed plate, and the pressure plate can be displaced up and down in the upper floating gap; the lower mold assembly includes a lower mold plate, a lower fixed plate and a back pressure plate arranged in sequence from bottom to top, wherein the lower mold plate is fixedly connected to the lower fixed plate, a lower floating gap is provided between the back pressure plate and the lower fixed plate, and the back pressure plate can be displaced up and down in the lower floating gap; the lower mold assembly also includes a lower mold base plate, the lower fixed plate and the back pressure plate are arranged in the mounting cavity of the lower mold base plate; the lower mold base plate is fixedly connected to the lower mold plate; during the mold closing action, the pressure plate and the back pressure plate are combined to press and fix the parts installed on the movable die.

[0006] In one embodiment, the upper mold assembly includes a first spring member, which is installed between the upper mold plate and the pressure plate, and the elastic force of the first spring member is used to create the upper floating gap between the pressure plate and the upper fixed plate; the lower mold assembly includes a force transmission rod, the upper end of which slides through the lower mold plate and the lower fixed plate in sequence and is fixedly connected to the back pressure plate; the lower end of the force transmission rod is connected to an external driving device, and the external driving device applies a force to the back pressure plate toward the pressure plate, so that the back pressure plate and the lower fixed plate have the lower floating gap.

[0007] In one embodiment, the movable die is provided with a mounting portion having a U-shaped cross-sectional shape, and the mounting portion is used to be interlocked and connected with the U-shaped inner side of the part; the mounting portion is provided with a waste hole set through, and the waste hole is coaxially matched with the punching hole of the part, and the waste hole is used to embed and accommodate the hole waste of the part.

[0008] In one embodiment, the movable die is L-shaped, and the mounting portion is arranged on the inner side of the L-shape of the movable die; the mounting portion is provided with abutment portions at both ends along its length, and the abutment portions are used to abut the side of the part.

[0009] In one embodiment, the lower mold base plate and / or the back pressure plate are provided with a first limiting portion and a second limiting portion; when the movable die rotates to the punching station, the movable die and the first limiting portion abut against each other; when the movable die rotates to the waste flushing station, the movable die and the second limiting portion abut against each other.

[0010] In one embodiment, the lower mold assembly is provided with a rotating shaft, and the movable die rotates around the rotating shaft; the lower end of the rotating shaft is installed on the side of the back pressure plate facing the lower fixed plate; the upper end of the rotating shaft passes through the back pressure plate and the movable die in sequence and extends to the upper position of the movable die; a limiting ring is provided at the upper end of the rotating shaft, and the limiting ring and the movable die abut against each other; a second spring member is sleeved on the middle part of the rotating shaft, and the upper and lower ends of the second spring member abut against the back pressure plate and the movable die respectively; the pressing plate is provided with an avoidance hole for avoiding the rotating shaft.

[0011] In one embodiment, the upper hole punch is fixedly mounted on the upper fixed plate, the pressure plate is provided with a first through hole portion, and the upper hole punch passes through the first through hole portion and is slidingly connected to the pressure plate; when the mold is open, the lower end face of the upper hole punch is higher than the lower end face of the pressure plate, and the height difference between the lower end face of the upper hole punch and the lower end face of the pressure plate is 0.4~0.8mm.

[0012] In one embodiment, the lower hole punch is fixedly mounted on the lower fixed plate, the back pressure plate is provided with a second through hole portion, and the lower hole punch passes through the second through hole portion and is slidingly connected to the back pressure plate; when the mold is open, the upper end face of the lower hole punch is lower than the upper end face of the back pressure plate, and the height difference between the upper end face of the lower hole punch and the upper end face of the back pressure plate is 0.4~0.8mm.

[0013] In one embodiment, the waste punching station is provided with a waste punch and a waste channel, the waste punch is fixedly mounted on the upper fixed plate, and the waste punch is coaxially matched with the waste hole; the waste channel is provided in the lower die assembly, and the waste channel is connected to the outside of the punching die; when the die is closed, the waste punch will flush the hole waste embedded in the waste hole into the waste channel.

[0014] In one embodiment, the movable dies are provided with more than two, and correspondingly, the punching stations and the waste flushing stations are provided with more than two groups.

[0015] The technical solution of the present invention is to set a movable die connected by rotation on the lower die assembly. When performing U-shaped punching processing, the U-shaped structure part is first installed on the movable die, and then the movable die is rotated to the punching station. The upper hole punch and the lower hole punch respectively fixed on the upper die assembly and the lower die assembly are used to perform synchronous punching on the U-shaped two side plates of the part. At this time, the hole waste of the part is embedded in the inside of the movable die; then the operator takes the punched part out of the movable die and rotates the movable die to the waste flushing station to flush out the hole waste. In the above processing, since the upper hole punch and the lower hole punch are coaxially set, the coaxiality of the U-shaped two side holes of the part can be ensured; and since only one punching process is used, the processing efficiency can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a structural schematic diagram of a part with a U-shaped punching hole in the background art;

[0018] Figure 2 A structural schematic diagram of an embodiment of a punching die for U-shaped punching provided by the present invention (mold closing state);

[0019] Figure 3 A structural schematic diagram of an embodiment of a punching die for U-shaped punching provided by the present invention (mold open state);

[0020] Figure 4 This is a schematic structural diagram of the lower die assembly in one embodiment of a punching die for U-shaped punching holes provided by the present invention.

[0021] Description of reference numerals:

[0022] 100, upper die assembly; 110, upper die plate; 120, upper backing plate; 130, upper fixing plate; 140, press plate; 141, avoidance hole; 142, first through-hole portion; 143, third through-hole portion; 150, first spring member; 160, upper hole punch; 170, waste punch;

[0023] 200, lower die assembly; 210, lower die plate; 220, lower fixing plate; 230, back pressure plate; 231, first limiting portion; 232, second through-hole portion; 240, lower die base plate; 241, second limiting portion; 250, force transmission rod; 260, lower hole punch; 270, movable die; 271, mounting portion; 272, waste hole; 273, abutting portion; 280, rotating shaft; 281, limiting ring; 282, second spring member; 290, waste channel;

[0024] 300, parts; 331, punching holes; 332, hole waste; 333, side panels.

[0025] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the description is only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0028] In addition, it should be noted that the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] For parts with U-shaped structure such as the lever arm in the motorcycle clutch, both side plates of the U-shaped structure need to be punched to form U-shaped punching holes (such as the attached Figure 1 As shown in the figure); In the prior art, the general forming step is to punch the side panels separately, that is, punching one side panel first, and then punching the other side panel. This, on the one hand, easily leads to a difference in the coaxiality of the holes on both sides; on the other hand, the use of two punching processes leads to low processing efficiency.

[0030] In order to solve the above technical problems, the present invention proposes a punching die for U-shaped punching holes.

[0031] See also Figures 2 to 4 In one embodiment of the present invention, the punching die includes an upper die assembly 100 and a lower die assembly 200, wherein the lower die assembly 200 is rotatably connected to a movable die 270, and the movable die 270 is used to install the U-shaped structure part 300; the movable die 270 can be rotated to a punching station and a waste punching station; the punching station includes an upper hole punch 160 fixedly arranged on the upper die assembly 100, and a lower hole punch 260 fixedly arranged on the lower die assembly 200, and the upper hole punch 160 and the lower hole punch 260 are coaxially arranged; when the movable die 270 rotates to the punching station, the upper hole punch 160 and the lower hole punch 260 are combined to synchronously punch the U-shaped two side plates 333 of the part 300; when the movable die 270 rotates to the waste punching station, the hole waste 332 embedded in the movable die 270 is flushed out.

[0032] The technical solution of the present invention is to set a movable die 270 with a rotatable connection on the lower die assembly 200. When processing the U-shaped punching hole 331, the U-shaped part 300 is first installed on the movable die 270, and then the movable die 270 is rotated to the punching station. The upper hole punch 160 and the lower hole punch 260 respectively fixed on the upper die assembly 100 and the lower die assembly 200 are combined to synchronously punch the U-shaped two side plates 333 of the part 300. At this time, the hole waste 332 of the part 300 is embedded in the inside of the movable die 270; then the operator takes the part 300 that has been punched out from the movable die 270, and rotates the movable die 270 to the waste punching station to punch out the hole waste 332. During the above processing, since the upper hole punch 160 and the lower hole punch 260 are coaxially arranged, the coaxial alignment of the U-shaped holes on both sides of the part 300 can be ensured; and since only one punching process is used, the processing efficiency can be effectively improved.

[0033] It should be noted that the rotational driving force of the above-mentioned movable die 270 can be provided by setting a rotation driving device in the lower die assembly 200, or by the operator manually rotating the movable die 270, and this application does not impose any specific restrictions on it.

[0034] As a preferred solution of the above embodiment, the upper mold assembly 100 includes an upper mold plate 110, an upper pad 120, an upper fixed plate 130 and a pressure plate 140 arranged in sequence from top to bottom, wherein the upper mold plate 110, the upper pad 120 and the upper fixed plate 130 are fixedly connected in sequence, and there is an upper floating gap between the pressure plate 140 and the upper fixed plate 130, and the pressure plate 140 can move up and down in the upper floating gap; the lower mold assembly 200 includes a lower mold plate 210, a lower fixed plate 220 and a back pressure plate 230 arranged in sequence from bottom to top, wherein the upper mold plate 110, the upper pad 120 and the upper fixed plate 130 are fixedly connected in sequence, and an upper floating gap is provided between the pressure plate 140 and the upper fixed plate 130, and the pressure plate 140 can move up and down in the upper floating gap; The middle and lower template 210 is fixedly connected to the lower fixed plate 220, and there is a lower floating gap between the back pressure plate 230 and the lower fixed plate 220, and the back pressure plate 230 can move up and down in the lower floating gap; the lower mold assembly 200 also includes a lower mold base plate 240, and the lower fixed plate 220 and the back pressure plate 230 are arranged in the installation cavity of the lower mold base plate 240; the lower mold base plate 240 is fixedly connected to the lower template 210; during the mold closing action, the pressing plate 140 and the back pressure plate 230 are combined to press and fix the part 300 installed on the movable die 270. With such arrangement, during the mold closing action, the upper mold assembly 100 moves downward as a whole, and the pressing plate 140 on the lower side will first contact the movable die 270 and drive the movable die 270 to squeeze the back pressure plate 230, so that the pressing plate 140 and the back pressure plate 230 are combined to press and fix the movable die 270, and then fix the part 300 installed on the movable die 270; then the position of the pressing plate 140 remains fixed; as the upper mold assembly 100 continues to move downward as a whole, at the punching station, it drives The upper hole punch 160 descends to perform a punching process on the corresponding position of the part 300; while the counter-pressure plate 230 is pressed down by the movable die 270 until it contacts the lower fixed plate 220, since the position of the lower hole punch 260 mounted on the lower fixed plate 220 remains unchanged, it is equivalent to the lower hole punch 260 moving upward relative to the counter-pressure plate 230, so that the lower hole punch 260 can punch the corresponding position of the part 300 from bottom to top; thereby achieving the punching hole 331 of the part 300. In the waste punching station, the upper die assembly 100 drives the waste punch 170 to descend to flush the waste 332 in the waste hole 272 of the movable die 270.

[0035] Furthermore, the upper mold assembly 100 includes a first spring member 150, which is installed between the upper mold plate 110 and the pressure plate 140. The elastic force of the first spring member 150 is used to create an upper floating gap between the pressure plate 140 and the upper fixed plate 130. With this arrangement, the elastic force of the first spring member 150 forms an upper floating gap between the pressure plate 140 and the upper fixed plate 130, thereby ensuring the smooth implementation of the technical solution of this application. At the same time, in order to ensure that the pressure plate 140 always maintains pressure to press the movable cavity 270 during the subsequent downward movement of the upper mold assembly 100, the first spring member 150 is required to apply an elastic force to the pressure plate 140 toward the counter-pressure plate 230, and utilize its elastic force to ensure that the pressure plate 140 always maintains pressure to press the movable cavity 270.

[0036] Furthermore, the lower mold assembly 200 includes a force transmission rod 250, the upper end of which slides sequentially through the lower mold plate 210 and the lower fixed plate 220 and is fixedly connected to the back pressure plate 230; the lower end of the force transmission rod 250 is connected to an external drive device (not shown in the drawings), which applies a force toward the press plate 140 to the back pressure plate 230 via the external drive device, thereby creating a lower floating gap between the back pressure plate 230 and the lower fixed plate 220. In this arrangement, the force transmission rod 250 applies a lifting force toward the press plate 140 to the back pressure plate 230, thereby forming a lower floating gap between the back pressure plate 230 and the lower fixed plate 220, thereby ensuring the smooth implementation of the technical solution of the present application. At the same time, during the mold closing action, the lifting force applied by the force transmission rod 250 to the pressure plate 140 is smaller than the downward force of the upper mold assembly 100, thereby ensuring that as the upper mold assembly 100 moves downward as a whole, the pressure plate 140 can drive the back pressure plate 230 downward until it is in contact with the lower fixed plate 220, thereby pressing and fixing the movable die 270.

[0037] As a preferred embodiment of the above embodiment, the movable die 270 is provided with a mounting portion 271 having a U-shaped cross-section. The mounting portion 271 is configured to engage with the inner side of the U-shaped portion of the part 300. A waste hole 272 is provided through the mounting portion 271. The waste hole 272 is coaxially aligned with the counter-punch hole 331 of the part 300 and is configured to receive the waste material 332 of the part 300. This arrangement allows the inner side of the U-shaped portion of the part 300 to be inserted into the U-shaped mounting portion 271, thereby achieving mutual installation between the part 300 and the movable die 270. This structure is simple and highly practical. At the same time, a waste hole 272 is set through the mounting portion 271, and the waste hole 272 is used to embed and accommodate the hole waste 332 of the part 300; it can be understood that the embedding and accommodation makes the waste hole 272 and the hole waste 332 in an interference fit relationship, so during the rotation of the movable die 270, the hole waste 332 will not fall out of the waste hole 272 by itself; only in the waste punching station, the waste punch 170 is used to apply external force to it, so that the hole waste 332 can be flushed out of the waste hole 272.

[0038] In one embodiment, the movable die 270 is L-shaped, with a mounting portion 271 disposed within the L-shaped interior of the movable die 270. Abutment portions 273 are provided at each end of the mounting portion 271 along its length, and are configured to abut against the side of the component 300. This arrangement prevents the component 300 from sliding left or right within the mounting portion 271. In this embodiment, since the mounting portion 271 is disposed within the L-shaped interior of the movable die 270, one side of the mounting portion 271 can rely on the movable die 270 itself as the abutment portion 273, requiring only the other side to be provided with the abutment portion 273.

[0039] In one embodiment, the lower mold base plate 240 and / or the back pressure plate 230 are provided with a first limiting portion 231 and a second limiting portion 241. When the movable die 270 rotates to the punching station, the movable die 270 and the first limiting portion 231 abut against each other; when the movable die 270 rotates to the waste flushing station, the movable die 270 and the second limiting portion 241 abut against each other. This arrangement ensures that the movable die 270 can accurately rotate to the punching station and the waste flushing station by providing the first limiting portion 231 and the second limiting portion 241, resulting in a simple structure and strong practicality. In this embodiment, the first limiting portion 231 is provided on the back pressure plate 230, and the second limiting portion 241 is provided on the lower mold base plate 240.

[0040] As a preferred solution of the above embodiment, the lower mold assembly 200 is provided with a rotating shaft 280, and the movable die 270 rotates around the rotating shaft 280; the lower end of the rotating shaft 280 is installed on the side of the back pressure plate 230 facing the lower fixed plate 220; the upper end of the rotating shaft 280 passes through the back pressure plate 230 and the movable die 270 in sequence and extends to the upper position of the movable die 270; the upper end of the rotating shaft 280 is provided with a limiting ring 281, and the limiting ring 281 and the movable die 270 abut against each other; the middle part of the rotating shaft 280 is sleeved with a second spring member 282, and the upper and lower ends of the second spring member 282 abut against the back pressure plate 230 and the movable die 270 respectively; the pressing plate 140 is provided with an avoidance hole 141 for avoiding the rotating shaft 280. With such arrangement, in the mold opening state, the movable die 270 is lifted up to abut against the limit ring 281 at the upper end of the rotating shaft member 280 under the elastic force of the second spring member 282. At this time, since there is a gap between the upper and lower sides of the movable die 270 and the pressure plate 140 and the back pressure plate 230, it is convenient for the operator to install the part 300 into the movable die 270; in the mold closing action, as the upper mold assembly 100 moves downward as a whole, the pressure plate 140 drives the movable die 270 to be squeezed toward the back pressure plate 230, and at the same time, the second spring member 282 is squeezed and compressed, so that the movable die 270 can overcome the elastic force of the second spring member 282 and be squeezed downward to fit with the back pressure plate 230. Since the upper end of the rotating shaft 280 is higher than the movable die 270 , in order to avoid interference between the pressing plate 140 and the rotating shaft 280 during the downward movement, the present application sets an avoidance hole 141 at the corresponding position of the pressing plate 140 for avoiding the rotating shaft 280 .

[0041] As a preferred embodiment of the above embodiment, the upper hole punch 160 is fixedly mounted on the upper fixed plate 130, and the blank holder 140 is provided with a first through-hole portion 142. The upper hole punch 160 passes through the first through-hole portion 142 and is slidably connected to the blank holder 140. When the mold is in the open state, the lower end surface of the upper hole punch 160 is higher than the lower end surface of the blank holder 140, and the height difference between the two is 0.4 to 0.8 mm. In this arrangement, the height difference is used as the punching distance of the upper hole punch 160 to ensure that after the blank holder 140 and the back pressure plate 230 have pressed and fixed the part 300, as the upper die assembly 100 continues to descend as a whole, the upper hole punch 160 still has sufficient punching distance to punch the part 300. In this embodiment, the height difference between the lower end surface of the upper hole punch 160 and the lower end surface of the blank holder 140 is 0.5 mm.

[0042] As a preferred embodiment of the above embodiment, a lower hole punch 260 is fixedly mounted on the lower fixed plate 220. The back pressure plate 230 is provided with a second through-hole portion 232. The lower hole punch 260 passes through the second through-hole portion 232 and is slidably connected to the back pressure plate 230. When the mold is open, the upper end surface of the lower hole punch 260 is lower than the upper end surface of the back pressure plate 230, and the height difference between the lower end surface and the back pressure plate 230 is 0.4-0.8 mm. This arrangement uses this height difference as the punching distance of the lower hole punch 260 to ensure that the back pressure plate 230 descends a sufficient distance for the lower hole punch 260 to punch the part 300 during the downward movement of the back pressure plate 230 by the upper mold assembly 100. In this embodiment, the height difference between the upper end surface of the lower hole punch 260 and the upper end surface of the back pressure plate 230 is 0.5 mm.

[0043] As a preferred solution of the above embodiment, the waste punching station is provided with a waste punch 170 and a waste channel 290. The waste punch 170 is fixedly mounted on the upper fixed plate 130, and the waste punch 170 is coaxially matched with the waste hole 272; the waste channel 290 is provided in the lower mold assembly 200, and the waste channel 290 is connected to the outside of the punching mold; when the mold is closed, the waste punch 170 punches the hole waste 332 embedded in the waste hole 272 into the waste channel 290. With such a configuration, during the mold closing action, the upper mold assembly 100 moves downward as a whole, and the pressure plate 140 located on the lower side will first contact the movable die 270 and drive the movable die 270 to squeeze the back pressure plate 230, so that the pressure plate 140 and the back pressure plate 230 are combined to press and fix the movable die 270, thereby fixing the part 300 installed on the movable die 270; then the position of the pressure plate 140 remains fixed; as the upper mold assembly 100 continues to move downward as a whole, at the waste punching station, the upper mold assembly 100 drives the waste punch 170 to move downward to punch the waste material 332 in the waste hole 272 of the movable die 270 into the waste channel 290 of the lower mold assembly 200, and then the waste material 332 is blown out of the outside of the punching die by compressed air. In this embodiment, the waste channel 290 is set through the back pressure plate 230, the lower fixed plate 220 and the lower template 210.

[0044] As a preferred embodiment of the above-described embodiment, at least two movable dies 270 are provided, and correspondingly, at least two sets of punching stations and waste removal stations are provided. This configuration, by providing at least two movable dies 270, enables simultaneous punching of multiple parts 300 during a single mold closing operation, further improving processing efficiency. In this embodiment, two movable dies 270 are provided. While one movable die 270 is in the punching station performing the punching operation, the other movable die 270 is in the waste removal station performing the waste removal operation.

[0045] It should be noted that the other contents of the punching die for U-shaped punching holes disclosed in the present invention are prior art and will not be described in detail here.

[0046] The above are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any direct / indirect application of the present invention in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A punching die for U-shaped punching holes, characterized by: The punching die comprises an upper die assembly and a lower die assembly, wherein the lower die assembly is rotatably connected to a movable die, and the movable die is used to install a part of a U-shaped structure; the movable die can be rotated to a punching station and a waste punching station; the punching station comprises an upper hole punch fixedly arranged on the upper die assembly, and a lower hole punch fixedly arranged on the lower die assembly, and the upper hole punch and the lower hole punch are coaxially arranged; when the movable die rotates to the punching station, the upper hole punch is combined with the lower hole punch to synchronously punch the U-shaped two side plates of the part; when the movable die rotates to the waste punching station, the hole waste embedded in the movable die is flushed out; The cam is fixedly mounted on the support frame of the upper mold base, and the cam is fixedly mounted on the support frame of the lower mold base, wherein the cam is fixedly mounted on the support frame of the lower mold base, and the cam is fixedly mounted on the support frame of the lower mold base. The lower die assembly is provided with a rotating shaft, and the movable die rotates around the rotating shaft; the lower end of the rotating shaft is installed on the side of the back pressure plate facing the lower fixed plate; the upper end of the rotating shaft passes through the back pressure plate and the movable die in sequence and extends to the upper position of the movable die; the upper end of the rotating shaft is provided with a limiting ring, and the limiting ring and the movable die abut against each other; the middle part of the rotating shaft is sleeved with a second spring part, and the upper and lower ends of the second spring part abut against the back pressure plate and the movable die respectively; the pressing plate is provided with an avoidance hole for avoiding the rotating shaft.

2. The punching die according to claim 1, wherein: The upper mold assembly includes a first spring member, which is installed between the upper mold plate and the pressing plate, and the elastic force of the first spring member is used to form the upper floating gap between the pressing plate and the upper fixed plate; The lower mold assembly includes a force transmission rod, the upper end of which slides through the lower mold plate and the lower fixed plate in sequence and is fixedly connected to the back pressure plate; the lower end of the force transmission rod is connected to an external driving device, which applies a force to the back pressure plate toward the pressing plate through the external driving device, so that there is the lower floating gap between the back pressure plate and the lower fixed plate.

3. The punching die according to claim 1, wherein: The movable die is provided with a mounting portion having a U-shaped cross-sectional structure, and the mounting portion is used to be interlocked and connected with the U-shaped inner side of the part; the mounting portion is provided with a waste hole set through, and the waste hole is coaxially matched with the punching hole of the part, and the waste hole is used to embed and accommodate the hole waste of the part.

4. The punching die according to claim 3, wherein: The movable die is L-shaped, and the mounting portion is arranged inside the L-shape of the movable die. The mounting portion is provided with abutment portions at both ends along its length, and the abutment portions are used to abut the side of the part.

5. The punching die according to claim 1, wherein: The lower mold base plate and / or the back pressure plate are provided with a first limiting portion and a second limiting portion; when the movable die rotates to the punching station, the movable die and the first limiting portion abut against each other; when the movable die rotates to the waste flushing station, the movable die and the second limiting portion abut against each other.

6. The punching die according to claim 1, wherein: The upper hole punch is fixedly mounted on the upper fixed plate, the pressure plate is provided with a first through-hole portion, and the upper hole punch passes through the first through-hole portion and is slidably connected to the pressure plate; in the mold opening state, the lower end surface of the upper hole punch is higher than the lower end surface of the pressure plate, and the height difference between the lower end surface of the upper hole punch and the lower end surface of the pressure plate is 0.4-0.8 mm; And / or, the lower hole punch is fixedly installed on the lower fixed plate, the back pressure plate is provided with a second through hole portion, and the lower hole punch passes through the second through hole portion and is slidably connected to the back pressure plate; when the mold is open, the upper end face of the lower hole punch is lower than the upper end face of the back pressure plate, and the height difference between the upper end face of the lower hole punch and the upper end face of the back pressure plate is 0.4~0.8mm.

7. The punching die according to claim 3, wherein: The waste punching station is provided with a waste punch and a waste channel. The waste punch is fixedly mounted on the upper fixed plate, and the waste punch is coaxially matched with the waste hole. The waste channel is provided in the lower die assembly, and the waste channel is connected to the outside of the punching die. When the die is closed, the waste punch will flush the hole waste embedded in the waste hole into the waste channel.

8. The punching die according to claim 1, wherein: There are more than two movable dies, and correspondingly, there are more than two groups of punching stations and waste flushing stations.

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