Commutator segment stamping die

Abstract

The utility model relates to the technical field of dies, and discloses a commutator segment stamping die which comprises a lower die structure and an upper die structure, and the upper die structure is sequentially provided with a first blanking assembly, a second blanking assembly, a third blanking assembly, a fourth blanking assembly and a fifth blanking assembly in the feeding direction; the lower die structure sequentially comprises a lower die base, a lower base plate, a discharging plate and a guide plate from bottom to top, a first guide groove is formed in the end face, facing the guide plate, of the discharging plate, a second guide groove aligned with the first guide groove is formed in the end face, facing the discharging plate, of the guide plate, a groove is formed in the end face, facing the discharging plate, of the guide plate, and a supporting spring is arranged in the groove. One end of the supporting spring abuts against the bottom wall of the groove, and the other end of the supporting spring abuts against the discharging plate. In the die opening state, a gap is reserved between the guide plate and the discharging plate, and the commutator segment forming die has the effect of improving the qualified rate of commutator segments.

Description

Technical Field

[0001] The present application relates to the technical field of dies, and in particular to a commutator segment punching die. Background Art

[0002] The commutator segment is the core component of the commutator and is used in DC motors and AC commutator motors. Its main function is to change the direction of the current when the motor rotates to ensure that the motor continues to rotate.

[0003] A commutator segment in the related art is used to be mounted on a mounting seat of a commutator. The commutator segment includes a trapezoidal body 300, and the body 300 is "L" shaped as a whole. The body 300 is a copper piece. A first notch 301 is provided on one side of the body 300, and three second notches 302 are provided on the other side of the body 300.

[0004] The existing commutator segments need to first install the raw copper piece on the mounting seat, then install the mounting seat on the lathe, and then use the turning tool to process the first notch 301 on the raw copper piece. Since the one-time feed amount of the turning tool is less than 3mm, the raw copper piece needs to be turned multiple times, resulting in a long processing time. Therefore, the coiled copper strip will be roughly processed into a commutator segment with a first notch 301 on the punch die, and then the commutator segment will be finely processed by the turning tool to improve the production efficiency of the commutator segment.

[0005] However, when the coiled copper strip is processed, the copper strip is pulled out from the coiled state and still bends, resulting in deviation in the position of the first notch 301 punched by the punch die in the copper strip, that is, the qualified rate of the commutator segment is low, so it needs to be improved. Utility Model Content

[0006] In order to improve the qualified rate of commutator segment forming, the present application provides a commutator segment punching die.

[0007] The present application provides a commutator segment punching die, which adopts the following technical solution:

[0008] A commutator segment punching die comprises a lower die structure and an upper die structure arranged above the lower die structure, wherein the upper die structure is provided with a first punching assembly for preliminary punching of a copper strip, a second punching assembly for forming a first notch in the copper strip, a third punching assembly, a fourth punching assembly for forming a second notch in the copper strip, and a fifth punching assembly for cutting the copper strip in sequence along the feeding direction; the lower die structure comprises a lower die seat, a lower pad, a discharge plate, and a guide plate in sequence from bottom to top, the discharge plate is provided with a first guide groove on the end face of the guide plate facing the guide plate, the guide plate is provided with a second guide groove aligned with the first guide groove on the end face of the guide plate facing the discharge plate, the guide plate is provided with a groove on the end face of the guide plate facing the discharge plate, a support spring is provided in the groove, one end of the support spring abuts against the bottom wall of the groove, and the other end of the support spring abuts against the discharge plate; when the die is in an open state, a gap is left between the guide plate and the discharge plate.

[0009] By adopting the above technical scheme, the copper strip is gradually processed by the first punching assembly, the second punching assembly, the third punching assembly, the fourth punching assembly and the fifth punching assembly, and the commutator segments are gradually formed from the copper strip; when the coiled copper strip is unfolded, the copper strip is still bent. After the copper strip moves into the first conductive groove and the second conductive groove, the weight of the guide plate is applied to the copper strip, which has a flattening effect on the copper strip, so that the first punching assembly, the second punching assembly, the third punching assembly, the fourth punching assembly and the fifth punching assembly can accurately punch the copper strip, thereby improving the qualified rate of the processed commutator segments; the copper strip is limited by the first guide groove and the second guide groove, so that the conveying direction of the copper strip is not easily deviated, thereby improving the qualified rate of the processed commutator segments.

[0010] Optionally, a positioning strip is provided in the first guide groove.

[0011] By adopting the above technical solution, the positioning strip can be inserted into the limiting groove of the commutator segment. During the transportation of the copper strip, the copper strip is not easily offset along the width direction of the copper strip, thus playing a limiting role.

[0012] Optionally, the unloading plate is provided with a first chamfer, and the first chamfer slope is arranged at the junction of the end face of the first guide groove facing the copper strip feeding direction and the inner wall of the first guide groove, and the guide plate is provided with a second chamfer, and the second chamfer slope is arranged at the junction of the end face of the second guide groove facing the copper strip feeding direction and the inner wall of the second guide groove.

[0013] By adopting the above technical solution, the first chamfer and the second chamfer have a guiding function, which makes it easy for the staff to insert the copper strip into the first guide groove and the second guide groove.

[0014] Optionally, a baffle plate located on the moving path of the copper strip is arranged on the unloading plate, and a second accommodating hole for inserting the baffle plate is opened on the end surface of the guide plate facing the unloading plate.

[0015] By adopting the above technical solution, when the copper strip collides with the baffle during the transportation of the copper strip along the feeding direction, the copper strip is limited so that it cannot continue to move. At the same time, it also plays a positioning role, so that the first punching assembly, the second punching assembly, the third punching assembly, the fourth punching assembly and the fifth punching assembly can process the specified position of the copper strip.

[0016] Optionally, the upper mold structure includes an upper mold plate, an upper pad, a punch fixing plate and a movable plate from top to bottom, and an upper mold spring is provided on the side of the movable plate facing the punch fixing plate, and the end of the upper mold spring away from the movable plate passes through the punch fixing plate and the upper pad in sequence and abuts against the upper mold plate.

[0017] By adopting the above technical solution and arranging the upper mold spring, the movable plate can float elastically when the mold is closed, so that the movable plate can better exert a force on the guide plate.

[0018] Optionally, an upper die guide column is provided on the punch fixing plate, and the upper die guide column passes through the movable plate and extends to the side of the movable plate away from the punch fixing plate, and a third guide hole for inserting the upper die guide column is opened on the guide plate.

[0019] By adopting the above technical solution, when the mold is closed, the upper mold guide pin is first inserted into the third guide hole to align the movable plate with the guide plate, so as to facilitate the first punching assembly, the second punching assembly, the third punching assembly, the fourth punching assembly and the fifth punching assembly to punch the copper strip.

[0020] Optionally, the first punching assembly includes a first punch disposed on a punch fixing plate, and the stripping plate and the guide plate are both provided with a first insertion hole for the first punch to be inserted.

[0021] By adopting the above technical solution, when the mold is closed, the first punch performs preliminary punching on the copper strip, on the one hand, forming the position of the first notch on the copper strip, and on the other hand, forming the approximate shape of the first notch on the copper strip, and the waste generated by punching is convenient for subsequent reuse and recycling.

[0022] Optionally, the second punching assembly includes a second punch arranged on a punch fixing plate, a protrusion is arranged on the side of the second punch, and the cross-section of the protrusion along the mold closing direction is a right-angled trapezoid, and the unloading plate and the guide plate are both provided with a second socket for inserting the second punch and the protrusion together.

[0023] By adopting the above technical solution, when the mold is closed, the third punch further punches and trims the copper strip; the convex block forms a triangular notch on the copper strip, and when the subsequent punch cuts the copper strip, the triangular notch can reduce burrs at the cut portion of the copper strip.

[0024] Optionally, the third punching assembly includes a third punch disposed on a punch fixing plate, and the lowest point of the third punch is lower than the lowest point of the second punch.

[0025] By adopting the above technical solution, when the mold is closed, the third punch is inserted into the first notch on the copper strip, so that the end face of the third punch facing the second punch contacts the copper material, so that the copper material cannot move along the feed direction, and when the second punch cuts the copper strip, the copper material is not easily deformed in the direction of the third punch, thereby reducing the probability of unqualified commutator segments.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The copper strip is processed step by step through the first punching assembly, the second punching assembly, the third punching assembly, the fourth punching assembly and the fifth punching assembly, and the commutator segments are gradually formed from the copper strip; when the coiled copper strip is unrolled, the copper strip is still bent. After the copper strip moves into the first conductive slot and the second conductive slot, the weight of the guide plate is applied to the copper strip, which has a flattening effect on the copper strip, so that the first punching assembly, the second punching assembly, the third punching assembly, the fourth punching assembly and the fifth punching assembly punch the copper strip accurately, thereby improving the qualified rate of the processed commutator segments; the copper strip is limited by the first guide slot and the second guide slot, so that the conveying direction of the copper strip is not easily deviated, thereby improving the qualified rate of the processed commutator segments;

[0028] 2. Set a baffle to position the copper strip so that the first punching assembly, the second punching assembly, the third punching assembly, the fourth punching assembly and the fifth punching assembly can accurately punch the copper strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 It is a schematic diagram of the structure of the commutator segment;

[0031] Figure 2 It is a schematic diagram of the structure of an embodiment of the present application;

[0032] Figure 3 It is a schematic diagram highlighting the upper mold structure;

[0033] Figure 4 It is an exploded view highlighting the upper die structure;

[0034] Figure 5 is a structural schematic diagram highlighting the second punching component;

[0035] Figure 6 It is a structural schematic diagram highlighting the relationship between the first punching component and the second punching component;

[0036] Figure 7 It is a schematic diagram highlighting the structure of the lower mold;

[0037] Figure 8 It is an exploded view highlighting the structure of the lower mold;

[0038] Fig. 9 is a schematic diagram highlighting the structure of the stripper plate.

[0039] Reference numerals: 100, upper die structure; 110, upper die plate; 111, guide sleeve; 120, upper backing plate; 121, first circular hole; 122, upper die spring; 130, punch fixing plate; 131, second circular hole; 132, first guide hole; 133, first mounting hole; 134, second mounting hole; 135, third mounting hole; 136, fourth mounting hole; 137, fifth mounting hole; 138, upper die guide column; 140, movable plate; 141 , first perforation; 142, second perforation; 143, third perforation; 144, fourth perforation; 145, fifth perforation; 146, second guide hole; 150, first punch assembly; 151, first punch; 160, second punch assembly; 161, second punch; 162, bump; 170, third punch assembly; 171, third punch; 180, fourth punch assembly; 181, fourth punch; 190, fifth punch assembly; 191, Punch block; 200, lower die structure; 210, lower die seat; 211, lower die guide column; 220, lower pad; 230, unloading plate; 231, first guide groove; 232, positioning strip; 2321, first chamfer; 233, first receiving hole; 234, baffle; 240, guide plate; 241, second guide groove; 2411, second chamfer; 242, second receiving hole; 243, third guide hole; 244, groove; 245, countersunk groove; 2 451, fixing hole; 250, supporting spring; 260, first plug hole; 261, second plug hole; 262, third plug hole; 263, fourth plug hole; 264, fifth plug hole; 270, first discharge hole; 271, second discharge hole; 272, third discharge hole; 273, fourth discharge hole; 274, fifth discharge hole; 300, main body; 301, first notch; 302, second notch; 303, limiting groove; 304, triangular notch. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-9 This application is described in further detail.

[0041] This embodiment discloses a commutator segment punching die. Figure 2A commutator segment punching die comprises an upper die structure 100 and a lower die structure 200 , wherein the upper die structure 100 is arranged on the lower die structure 200 .

[0042] Reference Figure 2 and Figure 3 The upper die structure 100 includes an upper die plate 110, an upper pad 120, a punch fixing plate 130, a movable plate 140, an upper die spring 122, a first punching assembly 150, a second punching assembly 160, a third punching assembly 170, a fourth punching assembly 180 and a fifth punching assembly 190.

[0043] Reference Figure 3 and Figure 4 , four guide sleeves 111 are arranged on the upper template 110. The upper pad 120 is arranged below the upper template 110, and the upper pad 120 is connected to the upper template 110 by bolts. The end surface of the upper pad 120 away from the upper template 110 is provided with a first circular hole 121.

[0044] Reference Figure 3 and Figure 4 The punch fixing plate 130 is arranged on the side of the upper pad 120 away from the upper mold plate 110, and the punch fixing plate 130 and the upper pad 120 are connected by bolts. A second circular hole 131 is formed on the end surface of the punch fixing plate 130 away from the upper pad 120. The second circular hole 131 is aligned with the first circular hole 121. A first guide hole 132 is formed on the side of the punch fixing plate 130 facing the upper pad 120.

[0045] Reference Figure 3 and Figure 4 The end surface of the punch fixing plate 130 away from the upper pad 120 is provided with a first mounting hole 133, a second mounting hole 134, a third mounting hole 135, three fourth mounting holes 136 and a fifth mounting hole 137 in sequence along the feeding direction of the copper strip.

[0046] Reference Figure 3 and Figure 4 The first punching assembly 150 is used for preliminary punching of the copper strip and preliminary positioning of the first notch 301 . The first punching assembly 150 includes a first punch 151 , which is inserted into the first mounting hole 133 .

[0047] Reference Figure 4 and Figure 5 The second punching assembly 160 is used to further cut and trim the copper strip. The second punching assembly 160 includes a second punch 161 and a convex block 162, and the convex block 162 is integrally formed on the side of the second punch 161. The cross section of the convex block 162 along the mold closing direction is a right-angle trapezoid. The second punch 161 is inserted into the second mounting hole 134. When the mold is closed, the convex block 162 forms a triangular notch 304 on the commutator segment on the copper strip.

[0048] Reference Figure 2 , Figure 3 and Figure 6 The third punching assembly 170 is used for cutting and limiting the copper strip. The third punching assembly 170 includes a third punch 171, which is inserted into the third mounting hole 135. The lowest point of the third punch 171 is lower than the lowest point of the second punch 161. During the mold closing process, the third punch 171 is inserted into the first notch 301 on the copper strip, so that the third punch 171 contacts the copper strip toward the end face of the second punch 161. As the upper mold structure 100 continues to move toward the lower mold structure 200, when the second punch 161 cuts the copper strip, the copper strip is not easily deformed toward the third punch 171.

[0049] Reference Figure 3 and Figure 4 The fourth punching assembly 180 is used to form the second notch 302 on the copper strip. The fourth punching assembly 180 includes a fourth punch 181 . There are three fourth punches 181 . The three fourth punches 181 are respectively inserted into one of the fourth mounting holes 136 .

[0050] Reference Figure 3 and Figure 4 The fifth punching assembly 190 is used to cut the commutator segments after the copper strip is formed. The fifth punching assembly 190 includes a punch block 191 , which is inserted into the fifth mounting hole 137 .

[0051] Reference Figure 3 and Figure 4 , the movable plate 140 is arranged on the side of the punch fixing plate 130 away from the upper pad 120. The movable plate 140 is provided with a first through hole 141, a second through hole 142, a third through hole 143, a fourth through hole 144 and a fifth through hole 145 in sequence along the feeding direction of the copper strip on the end surface away from the punch fixing plate 130. The first through hole 141 is aligned with the first mounting hole 133, and the first through hole 141 can allow the first punch 151 to pass through. The second through hole 142 is aligned with the second mounting hole 134, and the second through hole 142 can allow the second punch 161 and the bump 162 to pass through. The third through hole 143 is aligned with the third mounting hole 135, and the third through hole 143 can allow the third punch 171 to pass through. The fourth through hole 144 is aligned with the fourth mounting hole 136, and the fourth through hole 144 can allow the fourth punch 181 to pass through. The fifth through hole 145 is aligned with the fifth mounting hole 137 , and the punch block 191 can pass through the fifth through hole 145 .

[0052] Reference Figure 3 and Figure 4The upper die spring 122 is disposed above the movable plate 140 . The upper die spring 122 is in a compressed state. One end of the upper die spring 122 away from the movable plate 140 passes through the second circular hole 131 and the first circular hole 121 , and abuts against the upper die plate 110 .

[0053] Reference Figure 3 and Figure 4 The movable plate 140 is provided with a second guide hole 146, which is aligned with the first guide hole 132. The punch fixing plate 130 is provided with an upper die guide post 138, which is inserted into the first guide hole 132. The upper die guide post 138 passes through the second guide hole 146 and extends to the side of the movable plate 140 away from the punch fixing plate 130.

[0054] Reference Figure 7 and Figure 8 The lower die structure 200 includes a lower die base 210, a lower pad 220, a stripper plate 230, a guide plate 240 and a support spring 250. The lower die base 210 is provided with lower die guide pins 211, the number of which is the same as the number of the guide sleeves 111, and the lower die guide pins 211 can be inserted into the guide sleeves 111. The lower pad 220 is provided above the lower die base 210, and the lower pad 220 is connected to the lower die base 210 by bolts.

[0055] Reference Figure 8 and Fig. 9 The stripper plate 230 is arranged on the side of the lower pad 220 away from the lower die base 210, and the stripper plate 230 is connected to the lower pad 220 by a thread. The stripper plate 230 is provided with a first guide groove 231 at one end away from the lower pad 220 and along the feeding direction of the copper strip. A positioning strip 232 is fixedly connected to the bottom wall of the first guide groove 231, and the positioning strip 232 extends along the feeding direction of the copper strip. The stripper plate 230 is provided with a first chamfer 2321, and the inclined surface of the first chamfer 2321 is arranged at the junction of the end surface of the stripper plate 230 facing the feeding direction of the copper strip and the inner wall of the first guide groove 231.

[0056] Reference Figure 8 and Fig. 9 The end surface of the discharge plate 230 away from the lower baffle plate 234 is provided with a first receiving hole 233, and the first receiving hole 233 is communicated with the first guide groove 231. The baffle plate 234 is inserted into the first receiving hole 233.

[0057] Reference Figure 8 and Fig. 9The guide plate 240 is arranged on the side of the stripper plate 230 away from the lower pad 220. The end surface of the guide plate 240 facing the stripper plate 230 is provided with a second guide groove 241, and the second guide groove 241 is aligned with the first guide groove 231. The guide plate 240 is provided with a second chamfer 2411, and the inclined surface of the second chamfer 2411 is arranged at the junction of the end surface of the guide plate 240 facing the copper strip feeding direction and the inner wall of the second guide groove 241.

[0058] Reference Figure 8 and Fig. 9 A second accommodating hole 242 is formed on the end surface of the guide plate 240 facing the discharge plate 230 . The second accommodating hole 242 is communicated with the second guide groove 241 . The second accommodating hole 242 can allow the baffle plate 234 to pass through.

[0059] Reference Figure 3 and Figure 8 The guide plate 240 is provided with a third guide hole 243 on the end surface facing the upper mold structure 100. The third guide hole 243 can be inserted with the upper mold guide column 138 to align the guide plate 240 with the movable plate 140 so that the mold can be closed smoothly.

[0060] Reference Figure 8 and Fig. 9 The lower end surface of the guide plate 240 is provided with four grooves 244, and a support spring 250 is arranged in each groove 244. One end of the support spring 250 abuts against the bottom wall of the groove 244, and the other end of the support spring 250 abuts against the upper end surface of the stripper plate 230. The support spring 250 is in a compressed state. When the mold is not closed, a gap is left between the guide plate 240 and the stripper plate 230.

[0061] Reference Figure 3 , Figure 7 and Figure 8 , a countersunk groove 245 is provided on the end surface of the guide plate 240 away from the stripper plate 230, and a fixing hole 2451 is provided on the bottom wall of the countersunk groove 245. The guide plate 240 and the stripper plate 230 are connected by a limiting bolt. After the limiting bolt passes through the countersunk groove 245 and the fixing hole 2451 in sequence, it is threadedly connected to the stripper plate 230 so that the head of the limiting bolt is inserted into the countersunk groove 245. During the mold opening process, the upper mold structure 100 drives the guide plate 240 to move in a direction away from the stripper plate 230. When the head of the limiting bolt hits the bottom wall of the countersunk groove 245, the guide plate 240 is limited so that the guide plate 240 cannot move in a direction away from the stripper plate 230.

[0062] Reference Figure 2 and Figure 8The end surfaces of the stripper plate 230 and the guide plate 240 facing the upper mold structure 100 are provided with a first insertion hole 260, a second insertion hole 261, a third insertion hole 262, a fourth insertion hole 263 and a fifth insertion hole 264. The first insertion hole 260 is aligned with the first through hole 141, and the first insertion hole 260 can allow the first punch 151 to pass through. The second insertion hole 261 is aligned with the second through hole 142, and the second insertion hole 261 can allow the second punch 161 and the bump 162 to pass through together. The third insertion hole 262 is aligned with the third through hole 143, and the third insertion hole 262 can allow the third punch 171 to pass through. The fourth insertion hole 263 is aligned with the fourth through hole 144, and the fourth through hole 144 can allow the fourth punch 181 to pass through. The fifth insertion hole 264 is aligned with the fifth through hole 145, and the fifth through hole 145 can allow the punch 191 to pass through.

[0063] Reference Figure 8 and Fig. 9 On the stripper plate 230, the first plug hole 260, the second plug hole 261, the third plug hole 262, the fourth plug hole 263, and the fifth plug hole 264 are all connected to the first guide groove 231. On the guide plate 240, the first plug hole 260, the second plug hole 261, the third plug hole 262, the fourth plug hole 263, and the fifth plug hole 264 are all connected to the second guide groove 241.

[0064] Reference Figure 2 and Figure 8 The lower die base 210 and the lower pad 220 are provided with a first discharge hole 270, a second discharge hole 271, a third discharge hole 272, a fourth discharge hole 273 and a fifth discharge hole 274 on the end surface facing the upper die structure 100. The first discharge hole 270 is aligned with the first through hole 141, and the first discharge hole 270 can allow the waste generated by the punching of the first punch 151 to pass through. The second discharge hole 271 is aligned with the second through hole 142, and the second discharge hole 271 can allow the waste generated by the punching of the second punch 161 to pass through. The third discharge hole 272 is aligned with the third through hole 143, and the third discharge hole 272 can allow the waste generated by the punching of the third punch 171 to pass through. The fourth discharge hole 273 is aligned with the fourth through hole 144, and the fourth through hole 144 can allow the waste generated by the punching of the fourth punch 181 to pass through. The fifth discharge hole 274 is aligned with the fifth through hole 145 , and the fifth through hole 145 can allow the commutator segments formed after cutting to pass through.

[0065] The implementation principle of a commutator die in an embodiment of the present application is as follows: when the copper strip is moved onto the die, part of the copper strip is inserted into the first guide groove 231 and part of the copper strip is inserted into the second guide groove 241. The force of the guide plate 240 is applied to the copper strip, which has a straightening effect on the copper strip.

[0066] When the mold is closed, the first notch 301 is initially formed on the copper strip by the first punch 151, the copper strip is trimmed by the second punch 161 and the third punch 171, the second notch 302 is formed on the copper strip by the fourth punch 181, and finally the processed commutator segment is cut by the punch block 191.

[0067] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0068] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present application should be included in the protection scope of the present application.

Claims

1. A commutator segment punching die, comprising a lower die structure (200) and an upper die structure (100) disposed above the lower die structure (200), characterized in that: The upper die structure (100) is provided with a first punching assembly (150) for preliminary punching of the copper strip, a second punching assembly (160) for forming a first notch (301) in the copper strip, a third punching assembly (170), a fourth punching assembly (180) for forming a second notch (302) in the copper strip, and a fifth punching assembly (190) for cutting the copper strip in sequence along the feeding direction; the lower die structure (200) comprises a lower die seat (210), a lower pad (220), a stripper plate (230), and a guide plate (240) in sequence from bottom to top, wherein the stripper plate (230) faces the guide plate (240). A first guide groove (231) is provided on the end surface; a second guide groove (241) aligned with the first guide groove (231) is provided on the end surface of the guide plate (240) facing the discharge plate (230); a groove (244) is provided on the end surface of the guide plate (240) facing the discharge plate (230); a support spring (250) is arranged in the groove (244); one end of the support spring (250) abuts against the bottom wall of the groove (244), and the other end of the support spring (250) abuts against the discharge plate (230); when in the mold opening state, a gap is left between the guide plate (240) and the discharge plate (230).

2. A commutator segment punching die according to claim 1, characterized in that: A positioning strip (232) is provided in the first guide groove (231).

3. A commutator segment punching die according to claim 1, characterized in that: The unloading plate (230) is provided with a first chamfer (2321), and the inclined surface of the first chamfer (2321) is arranged at the junction of the end surface of the first guide groove (231) facing the copper strip feeding direction and the inner wall of the first guide groove (231); the guide plate (240) is provided with a second chamfer (2411), and the inclined surface of the second chamfer (2411) is arranged at the junction of the end surface of the second guide groove (241) facing the copper strip feeding direction and the inner wall of the second guide groove (241).

4. A commutator segment punching die according to claim 1, characterized in that: The discharge plate (230) is provided with a baffle (234) located on the copper strip moving path, and the guide plate (240) is provided with a second receiving hole (242) for inserting the baffle (234) on the end surface facing the discharge plate (230).

5. A commutator segment punching die according to claim 1, characterized in that: The upper mold structure (100) includes, from top to bottom, an upper mold plate (110), an upper pad (120), a punch fixing plate (130) and a movable plate (140); an upper mold spring (122) is provided on the side of the movable plate (140) facing the punch fixing plate (130); an end of the upper mold spring (122) away from the movable plate (140) passes through the punch fixing plate (130) and the upper pad (120) in sequence and abuts against the upper mold plate (110).

6. A commutator segment punching die according to claim 5, characterized in that: An upper die guide column (138) is provided on the punch fixing plate (130), and the upper die guide column (138) passes through the movable plate (140) and extends to the side of the movable plate (140) away from the punch fixing plate (130). A third guide hole (243) for inserting the upper die guide column (138) is opened on the guide plate (240).

7. A commutator segment punching die according to claim 5, characterized in that: The first punching assembly (150) comprises a first punch (151) arranged on a punch fixing plate (130), and the stripping plate (230) and the guide plate (240) are both provided with a first insertion hole (260) for inserting the first punch (151).

8. A commutator segment punching die according to claim 5, characterized in that: The second punching assembly (160) comprises a second punch (161) arranged on a punch fixing plate (130); a convex block (162) is arranged on the side of the second punch (161); the cross section of the convex block (162) along the mold closing direction is a right-angled trapezoid; and the unloading plate (230) and the guide plate (240) are both provided with a second insertion hole (261) for the second punch (161) and the convex block (162) to be inserted together.

9. A commutator segment punching die according to claim 8, characterized in that: The third punching assembly (170) comprises a third punch (171) arranged on a punch fixing plate (130), wherein the lowest point of the third punch (171) is lower than the lowest point of the second punch (161).

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