Multi-groove-shaped combined open type indexing punching die and punching process for motor punching sheet

Abstract

The invention relates to a multi-groove-shaped combined open type indexing punching die and a punching process for a motor punching sheet, belongs to the field of motor punching sheet machining, and solves the technical problems that an existing punching sheet punching die is low in efficiency and limited in groove type arrangement and combination. The punching die comprises an upper die base, an upper base plate, a male die fixing plate, a male die, an adjusting device, a female die fixing plate, a lower base plate and a lower die base. A plurality of bending sliding grooves are formed in the top of the upper base plate or the bottom of the upper die base, a plurality of vertically-through mounting holes are formed in the upper base plate, and the mounting holes are aligned to the bending sliding grooves one by one in the vertical direction; a plurality of via holes which are coaxially and uniformly distributed are formed in the male die fixing plate; the male die comprises a plurality of punches in different shapes, and the upper sections of the punches are slidably mounted in the via holes in a one-to-one correspondence manner; a plurality of groups of adjusting devices are provided; the adjusting device comprises a driver, a bending transmission assembly and a cushion block. Various groove types can be punched at the same time, the punching effect is good, the rejection rate is reduced, and the efficiency is high.

Description

Technical Field

[0001] The invention belongs to the technical field of motor punching sheet processing, and particularly relates to a multi-groove combined open-type indexing punching die and a punching process for motor punching sheets. Background Art

[0002] The punching of medium and large motors, as well as the punching of multiple slot punchings for stators and rotors that require multiple arrangements and combinations, are generally achieved using a single-slot punching process due to mold cost and equipment factors. That is, the ring shaft hole and keyway are positioned after blanking, and the large and small slots of the stator and rotor are single-punched dies are used to punch one slot each time. The high-speed single-slot punching equipment drives the ring to continuously rotate and punch to obtain stator and rotor punchings. Compared with compound punching, the efficiency is lower, the slot arrangement and combination are limited, and the slot style verification is limited. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a multi-slot combined open indexing punching die and punching process for motor punching sheets, which solves the technical problems of low efficiency and limited slot arrangement and combination in the existing punching scheme for punching multi-slot punching sheets.

[0004] In order to solve the above problems, the technical solution of the present invention is: a multi-slot combined open indexing punching die for motor punching sheets, comprising: Upper die seat; An upper pad, wherein the upper end of the upper pad is fixedly connected to the lower end of the upper die base; a plurality of bending chutes are provided on the top of the upper pad or the bottom of the upper die base, and a plurality of vertically penetrating mounting holes are provided on the upper pad, and the mounting holes are aligned one by one with the bending chutes in the vertical direction; The punch fixing plate has an upper end that is fixedly connected to the lower end of the upper pad; a plurality of coaxially evenly distributed through holes are provided on the punch fixing plate; The punch comprises a plurality of punches of different shapes, each of which has a plurality of punches. The upper sections of the punches are slidably mounted in the through holes in a one-to-one correspondence, and the lower sections of the punches pass downward through the punch fixing plate. A limiting clamp corresponding to each punch is fixedly provided at the lower part of the punch fixing plate to slidably limit the upper sections of the punches in the through holes. The adjusting device has several groups; the adjusting device includes a driver, a bending transmission assembly and a pad, and the bending transmission assembly is movably installed in the bending slide groove in a one-to-one manner; the bending transmission assembly includes a first special-shaped drawer plate, a second special-shaped drawer plate and a gear, one end of the first special-shaped drawer plate is fixedly provided with a first rack, and one end of the second special-shaped drawer plate is fixedly provided with a second rack; the gear is rotatably arranged in the middle of the bending slide groove, the first special-shaped drawer plate and the second special-shaped drawer plate are respectively slidably arranged on both sides of the gear, and the first rack and the second rack are meshed with the gear; the driver is connected to the first special-shaped drawer plate to drive the first special-shaped drawer plate to slide reciprocatingly; the pads are vertically slidably installed in the mounting holes of the upper pad plate in a one-to-one manner, the pads and the punches are vertically aligned and contacted one by one, and the lower end of the second special-shaped drawer plate is provided with a recessed groove for the upper part of the pad to fit in; when the pads are vertically aligned with the recessed groove, the punches aligned with the pads are in a non-working state, and when the pads are staggered with the recessed groove in the vertical direction, the punches aligned with the pads are in a working state; The die fixing plate is horizontally located below the punch fixing plate, and has a notch on the die fixing plate for the lower section of the punch to penetrate; The lower pad is horizontally located below the die fixing plate, and the lower pad is fixedly connected to the die fixing plate; The lower die base is located below the lower pad, is fixedly connected to the lower pad, and is rotationally connected to the upper die base via a vertical rotating assembly.

[0005] Preferably, the punch comprises a first flat-bottom square slot punch, a second flat-bottom square slot punch, a round-bottom conical slot punch and a shearing punch, and the shearing punch is used to shear out the inner hole of the stator.

[0006] Preferably, there are five first flat-bottomed square slot punches, five second flat-bottomed square slot punches, and five round-bottomed tapered slot punches, the five first flat-bottomed square slot punches are circumferentially arranged continuously on the punch fixing plate, the five second flat-bottomed square slot punches are continuously arranged on the punch fixing plate, and the five round-bottomed tapered slot punches are continuously arranged on the punch fixing plate; The five first flat-bottom square slot punches are A-1 to A-5 punches, and the adjusting devices corresponding to the five first flat-bottom square slot punches are a-1 to a-5 adjusting devices; the five round-bottom conical slot punches are B-1 to B-5 punches, and the adjusting devices corresponding to the five round-bottom conical slot punches are b-1 to b-5 adjusting devices; the five second flat-bottom square slot punches are C-1 to C-5 punches, and the adjusting devices corresponding to the five second flat-bottom square slot punches are c-1 to c-5 adjusting devices.

[0007] Preferably, the first rack and the second rack are both meshingly connected to the same side of the gear.

[0008] Preferably, it also includes a stripper plate, which is elastically connected to the upper die base through an elastic component.

[0009] Another object of the present invention is to provide a punching process for a motor punching sheet, using the above-mentioned multi-slot combined open indexing punching die for the motor punching sheet, and the punching process steps are as follows: Divide the stator or rotor into N equal parts according to the number of slots, position the ring with the ring shaft hole and keyway, adjust the punches needed on the die to the working state, and adjust other punches to the non-working state. The die drives the ring to rotate, and the ring is punched out in N consecutive rotations.

[0010] Preferably, when the number of slots in the stator punching sheet or the rotor punching sheet is 60 and the slot shapes are 3, the whole punching sheet is divided into 12 equal parts with 5 slots as a group, and the die drives the ring sheet to rotate 12 times to punch. Each punch completes the punching of 5 slots and simultaneously shears 1 / 12 of the stator inner hole. The die drives the ring sheet to rotate continuously to complete the punching of all slot shapes and the shearing of the stator inner hole. The process of realizing the combined punching of slot type CBABC is as follows: the A-3 punch is adjusted to the working state through the a-3 adjusting device; the B-2 and B-4 punches are adjusted to the working state through the b-2 and b-4 adjusting devices respectively; the C-1 and C-5 punches are adjusted to the working state through the c-1 and c-5 adjusting devices respectively; the remaining 10 punches are adjusted to the non-working state; the mold is installed on the open indexing punch press, the mold gap is adjusted, the mold is positioned with the axis hole, and the number of punches per rotation of the punch on the punch press is set to 12 to obtain a three-slot punch.

[0011] Preferably, when the number of slots in the stator punching sheet or the rotor punching sheet is 60 and the slot shapes are 2, the whole punching sheet is divided into 12 equal parts with 5 slots as a group, and the die drives the ring sheet to rotate 12 times to punch. Each punching completes the punching of 5 slots and at the same time, the stator inner hole is sheared by 1 / 12. The die drives the ring sheet to rotate continuously to complete the punching of all slot shapes and the shearing of the stator inner hole. Realize the groove type ABABA combination punching process: adjust the A-1, A-3, and A-5 punches to the working state through the a-1, a-3, and a-5 adjustment devices, and adjust the B-2 and B-4 punches to the working state through the b-2 and b-4 adjustment devices; the remaining 10 punches are adjusted to the non-working state; install the mold on the open indexing punch press, adjust the mold gap, position it with the axis hole, set the number of punches per rotation of the punch on the punch press to 12, and obtain a double-slot punch.

[0012] Preferably, when the number of slots in the stator punching sheet or the rotor punching sheet is 60 and the slot shape is 1, the whole punching sheet is divided into 12 equal parts with 5 slots as a group, and the die drives the ring sheet to rotate 12 times to punch. Each punching completes the punching of 5 slots and at the same time, the stator inner hole is sheared by 1 / 12. The die drives the ring sheet to rotate continuously to complete the punching of all slot shapes and the shearing of the stator inner hole. To realize the punching process of slot type B: adjust the B-1, B-2, B-3, B-4, and B-5 punches to the working state through the b-1, b-2, b-3, b-4, and b-5 adjustment devices; the other 10 punches are adjusted to the non-working state; install the mold on the open indexing punch press, adjust the mold gap, position it with the axis hole, set the number of punches per rotation of the punch on the punch press to 12, and obtain a single slot-shaped punch.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes a composite indexing die to produce both single-slot and multi-slot combination laminations. Compared to existing stator single-slot punching methods, this method avoids the scrapping of laminations caused by small scrap jumping during the transition punching process. Furthermore, the various slot types are punched independently, enabling the production of three or more combinations of special-shaped slots. Compared to existing single-slot punching processes, this method significantly improves production efficiency, offers a high cost-effectiveness, and can better meet the R&D needs of enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of arrangement of three special-shaped grooves on the punching sheet in the embodiment; Figure 2 Schematic diagram of the structure of the punching die in the embodiment; Figure 3 Schematic diagram of the structure of the punch and the punch fixing plate in the embodiment; Figure 4 This is the first groove diagram when the groove type CBABC is punched in the embodiment; Figure 5 This is the final groove shape diagram when the groove shape CBABC is punched in the embodiment; Figure 6 This is the first groove diagram when the groove type ABABA is punched in the embodiment; Figure 7 This is the final groove shape diagram when the groove shape ABABA is punched in the embodiment; Figure 8 This is the first groove shape diagram when the groove type B is punched in the embodiment; Figure 9 This is the final groove shape diagram when the groove type B is punched in the embodiment; Figure 10 Schematic diagram of the structure of the regulating device in the embodiment.

[0015] : Illustrations: 10, upper die base; 11, bending slide; 20, lower die base; 30, upper pad; 31, mounting hole; 40, punch fixing plate; 41, through hole; 50, unloading plate; 51, elastic component; 60, die fixing plate; 70, lower pad; 80, punch; 90, limiting clamping plate; 100, first flat-bottom square groove punch; 110, round-bottom conical groove punch; 120, second flat-bottom square groove punch; 130, shear punch; 140, guide sleeve; 150, guide column; 160, pad; 170, adjusting device; 171, first special-shaped drawer plate; 172, second special-shaped drawer plate; 1721, recessed groove; 173, gear; 174, drive; 175, fixing seat; 176, first rack; 177, second rack. DETAILED DESCRIPTION

[0016] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0017] Example 1: Figures 1-10 As shown, this embodiment discloses a multi-groove combined open indexing punching die for motor punching sheets, including an upper die base 10, an upper pad 30, a punch fixing plate 40, a punch 80, an adjusting device 170, a die fixing plate 60, a lower pad 70 and a lower die base 20. The upper pad 30 is horizontally located below the upper die base 10, the top surface of the upper pad 30 is in contact with the bottom surface of the upper die base 10, and the upper pad 30 is fixedly connected to the upper die base 10; a plurality of bending grooves 11 are provided on the top of the upper pad 30 or the bottom of the upper die base 10, and a plurality of vertically penetrating mounting holes 31 are provided on the upper pad 30, and the mounting holes 31 are aligned one by one with the bending grooves 11 in the vertical direction; the punch fixing plate 40 is horizontally located below the upper pad 30, the top surface of the punch fixing plate 40 is in contact with the bottom surface of the upper pad 30, and the punch fixing plate 40 is in contact with the bottom surface of the upper pad 30. The plate 40 is fixedly connected to the upper pad 30; a number of coaxially evenly distributed through holes 41 are opened on the punch fixing plate 40; the punch 80 includes a number of punches of different shapes, each type of punch has a number of, and the upper sections of the several punches are slidably installed in the through holes 41 in a one-to-one manner, and the lower sections of the punches pass downward through the punch fixing plate 40; a limiting clamping plate 90 corresponding to the punches is fixedly set at the lower part of the punch fixing plate 40 to limit the sliding of the upper section of the punch in the through hole 41. Specifically, a limiting groove is opened in the middle of the side wall of the punch for the limiting clamping plate 90 to be movably inserted.

[0018] The adjusting device 170 has several groups; the adjusting device 170 includes a driver 174, a bending transmission assembly and a pad 160, and the bending transmission assembly is movably installed in the bending chute 11 in a one-to-one manner; the bending transmission assembly includes a first special-shaped drawer plate 171, a second special-shaped drawer plate 172 and a gear 173, one end of the first special-shaped drawer plate 171 is fixedly provided with a first rack 176, and one end of the second special-shaped drawer plate 172 is fixedly provided with a second rack 177; the gear 173 is rotatably arranged in the middle of the bending chute 11, the first special-shaped drawer plate 171 and the second special-shaped drawer plate 172 are respectively slidably arranged on both sides of the gear 173, and the first rack 176 and the second rack 177 are both meshed with the gear 173; the driver 174 is connected to the first special-shaped drawer plate 171 to drive the first special-shaped drawer plate 171 to slide back and forth; the pad 160 is vertically slidably installed on the upper pad In the mounting hole 31 of the plate 30, the pad 160 and the punch are aligned and contacted one by one vertically, and the lower end of the second special-shaped drawer plate 172 is provided with a recessed groove 1721 for the upper part of the pad 160 to fit in and embed; when the pad 160 and the recessed groove 1721 are vertically aligned, the punch aligned with the pad 160 is in an inactive state, and when the pad 160 and the recessed groove 1721 are staggered in the vertical direction, the punch aligned with the pad 160 is in a working state; the die fixing plate 60 is horizontally located below the punch fixing plate 40, and the die fixing plate 60 has a recess for the lower section of the punch to penetrate; the lower pad 70 is horizontally located below the die fixing plate 60, and the lower pad 70 is fixedly connected to the die fixing plate 60; the lower die base 20 is located below the lower pad 70, and the lower die base 20 is fixedly connected to the lower pad 70, and the lower die base 20 is rotatably connected to the upper die base 10 through a vertical rotating assembly.

[0019] Through the above arrangement, multiple punches are provided on the die, and the corresponding adjustment device 170 for switching the working state of the punches is used. Multiple groove shapes can be punched simultaneously, and each punch punches a corresponding groove shape, which has a good punching effect, reduces the scrap rate, and is efficient. The first special-shaped pumping plate 171, the second special-shaped pumping plate 172 and the gear 173 are installed using the bending chute 11. The structure is compact and easy to install more punches and adjustment devices 170. The adjustment device 170 can adapt to the bending angles of various bending chute 11 and has good versatility.

[0020] The actuator 174 is a pneumatic cylinder or an adjusting screw. When the actuator 174 is an adjusting screw, a fixed seat 175 is fixedly provided on the upper die base 10. The adjusting screw threads through the fixed seat 175 and is rotatably connected to the first special-shaped draw plate 171. By rotating the adjusting screw, the first special-shaped draw plate 171 slides in the curved chute 11, thereby driving the gear 173 to rotate. The rotation of the gear 173 drives the second special-shaped draw plate 172 to slide in the curved chute 11, achieving alignment and misalignment between the corresponding recessed groove 1721 and the pad 160, thereby switching the working state of the corresponding punch. The vertical rotation assembly includes a vertical guide post 150 and a guide sleeve 140. The guide post 150 is fixedly connected to the lower die base 20, and the guide sleeve 140 is fixedly connected to the upper die base 10. The guide post 150 is rotatably mounted in the guide sleeve 140.

[0021] Figure 10 This is a schematic diagram of the adjustment device 170 of the mold in this embodiment. The first special-shaped drawer plate 171 and the second special-shaped drawer plate 172 are driven to slide by adjusting the tightness of the screws. The corresponding punch working state is switched by cooperating with the recessed groove 1721 opened on the second special-shaped drawer plate 172 and the pad 160.

[0022] In this embodiment of a multi-slot, combined, open-type indexing die for punching motor laminations, the punch 80 includes a first flat-bottomed square slot punch 100, a second flat-bottomed square slot punch 120, a round-bottomed tapered slot punch 110, and a shear punch 130, coaxially arranged circumferentially on a punch fixing plate 40. The shear punch 130 is used to shear the inner hole of the stator. This arrangement allows for simultaneous punching of one to three types of punches.

[0023] In the multi-groove combined open indexing punching die of a motor punching sheet of this embodiment, there are five first flat-bottomed square slot punches 100, five second flat-bottomed square slot punches 120 and five round-bottomed tapered slot punches 110. The five first flat-bottomed square slot punches 100 are coaxially and continuously arranged circumferentially on the punch fixing plate 40, the five second flat-bottomed square slot punches 120 are coaxially and continuously arranged circumferentially on the punch fixing plate 40, and the five round-bottomed tapered slot punches 110 are coaxially and continuously arranged circumferentially on the punch fixing plate 40. Figure 3 As shown, the five first flat-bottom square slot punches 100 are respectively A-1 to A-5 punches, and the adjusting devices 170 correspondingly connected to the five first flat-bottom square slot punches 100 are respectively a-1 to a-5 adjusting devices 170; the five round-bottom conical slot punches 110 are respectively B-1 to B-5 punches, and the adjusting devices 170 correspondingly connected to the five round-bottom conical slot punches 110 are respectively b-1 to b-5 adjusting devices 170; the five second flat-bottom square slot punches 120 are respectively C-1 to C-5 punches, and the adjusting devices 170 correspondingly connected to the five second flat-bottom square slot punches 120 are respectively c-1 to c-5 adjusting devices 170.

[0024] In the multi-groove combined open indexing punching die of a motor punching sheet of this embodiment, the first rack 176 and the second rack 177 are both meshed and connected with the same side of the gear 173. Figure 10 The diagram shows the connection structure of two special-shaped drawers. The racks of the two special-shaped drawers intersect at one above the other. When the adjusting screw is pushed inward, the gear 173 rotates, pushing the special-shaped drawers along the curved chute 11. At this time, the recessed groove 1721 under the second special-shaped drawer 172 shifts, causing it to align or offset with the corresponding pad 160, thereby controlling the working state of the punch.

[0025] The multi-groove combined open indexing punching die of a motor punching sheet of this embodiment further includes a stripper plate 50, which is elastically connected to the upper die base 10 via an elastic component 51. The installation structure and working principle of the stripper plate 50 are prior art and will not be described in detail.

[0026] like Figure 1 As shown, take the H315 stator three-shaped slot punching sheet as an example: the three slot shapes of the stator are arranged regularly, namely slot A, slot B and slot C, with five slots as a group, which can be arranged in different combinations, with a total of 60 slots. Among them, slots A and C are flat-bottomed square slots, and slot B is a round-bottomed conical slot. At this time, in order to realize punching sheets with various slot arrangements, 15 (3*5) width double punching dies are required, which is extremely expensive and not suitable for meeting the market's non-standard customization needs; and the existing double punching of conventional industrial motor punching sheets generally only reaches the center height H355, which cannot meet the needs of low-voltage, high-power H400 / 450 and large pole counts and multiple special slots. In order to improve efficiency and reduce mold costs, this embodiment adopts a multi-slot combination open indexing punching die for motor punching sheets.

[0027] Example 2: Figures 1-10 As shown, this embodiment provides a punching process for a motor punching sheet, using a multi-slot combined open indexing punching die for a motor punching sheet in Example 1. The punching process steps are as follows: Divide the stator or rotor into N equal parts according to the number of slots, position the ring with the ring shaft hole and keyway, adjust the punches needed on the die to the working state, and adjust other punches to the non-working state. The die drives the ring to rotate, and the ring is punched out in N consecutive rotations.

[0028] When the number of slots in the stator or rotor sheet is 60 and there are 3 slot shapes, the whole sheet is divided into 12 equal parts with 5 slots as a group. The die drives the ring sheet to rotate 12 times to punch. Each punch completes the punching of 5 slots and at the same time, the stator inner hole is sheared by 1 / 12. The die drives the ring sheet to rotate continuously to complete the punching of all slot shapes and the shearing of the stator inner hole. The structure of the open indexing punching die is as follows: Figure 2 、 Figure 3As shown in the figure, the process of realizing the combined punching of slot type CBABC is as follows: the A-3 punch is adjusted to the working state by the a-3 adjusting device; the B-2 and B-4 punches are adjusted to the working state by the b-2 and b-4 adjusting devices respectively; the C-1 and C-5 punches are adjusted to the working state by the c-1 and c-5 adjusting devices respectively; the remaining 10 punches are adjusted to the non-working state; the die is installed in the open indexing punch press, the die gap is adjusted, the die is positioned with the axis hole, and the number of punches per revolution of the punching sheet on the punch press is set to 12, and the result is as shown in the figure. Figure 4 and Figure 5 The three-groove punch shown.

[0029] When the number of slots in the stator punching sheet or the rotor punching sheet is 60 and there are 2 slot shapes, the whole punching sheet is divided into 12 equal parts with 5 slots as a group, and the die drives the ring sheet to rotate 12 times to punch. Each punch completes the punching of 5 slots, and at the same time, 1 / 12 of the stator inner hole is sheared. The die drives the ring sheet to rotate continuously to complete the punching of all slot shapes and the shearing of the stator inner hole; realize the slot type ABABA combination punching process: adjust the A-1, A-3, and A-5 punches to the working state through the a-1, a-3, and a-5 adjustment devices, and adjust the B-2 and B-4 punches to the working state through the b-2 and b-4 adjustment devices; the remaining 10 punches are adjusted to the non-working state; install the die on the open indexing punch press, adjust the die gap, position it with the shaft hole, set the number of punches per rotation of the punch on the punch press to 12, and obtain the following Figure 6 and Figure 7 The double-grooved punch shown.

[0030] When the number of slots in the stator punching sheet or the rotor punching sheet is 60 and the slot shape is 1, the whole punching sheet is divided into 12 equal parts with 5 slots as a group, and the die drives the ring sheet to rotate 12 times to punch. Each punch completes the punching of 5 slots, and at the same time, 1 / 12 of the stator inner hole is sheared. The die drives the ring sheet to rotate continuously to complete the punching of all slot shapes and the shearing of the stator inner hole. To realize the punching process of slot type B: adjust the B-1, B-2, B-3, B-4, and B-5 punches to the working state through the b-1, b-2, b-3, b-4, and b-5 adjustment devices; the remaining 10 punches are adjusted to the non-working state; install the die on the open indexing punch press, adjust the die gap, position it with the shaft hole, set the number of punches per punch rotation on the punch press to 12, and obtain the following Figure 8 and Figure 9 Single slot punch shown.

[0031] By adopting the motor punching process of this embodiment, multiple slot types can be punched independently at the same time. One slot type or multiple slot types can be punched at the same time, which is adaptable to the arrangement and combination of various different slot types, with better versatility and high efficiency.

Claims

1. A multi-groove combined open indexing punching die for motor punching sheets, characterized in that: include: Upper die base (10); An upper pad (30), the upper end of the upper pad (30) is fixedly connected to the lower end of the upper die base (10); a plurality of bending chutes (11) are provided on the top of the upper pad (30) or the bottom of the upper die base (10); a plurality of vertically penetrating mounting holes (31) are provided on the upper pad (30), and the mounting holes (31) are aligned one by one with the bending chutes (11) in the vertical direction; A punch fixing plate (40), the upper end of the punch fixing plate (40) is fixedly connected to the lower end of the upper pad (30); a plurality of coaxially evenly distributed through holes (41) are provided on the punch fixing plate (40); The punch (80) includes a plurality of punches of different shapes, each of which has a plurality of punches. The upper sections of the plurality of punches are slidably mounted in the through holes (41) in a one-to-one correspondence, and the lower sections of the punches pass downward through the punch fixing plate (40); a limiting clamping plate (90) corresponding to the punches is fixedly provided at the lower part of the punch fixing plate (40) to limit the upper sections of the punches to slide in the through holes (41); The adjusting device (170) has several groups; the adjusting device (170) includes a driver (174), a bending transmission assembly and a pad (160); the bending transmission assembly is movably installed in the bending chute (11) in a one-to-one correspondence; the bending transmission assembly includes a first special-shaped draw plate (171), a second special-shaped draw plate (172) and a gear (173); one end of the first special-shaped draw plate (171) is fixedly provided with a first rack (176), and one end of the second special-shaped draw plate (172) is fixedly provided with a second rack (177); the gear (173) is rotatably provided in the middle of the bending chute (11); the first special-shaped draw plate (171) and the second special-shaped draw plate (172) are respectively slidably provided on both sides of the gear (173); the first rack (176) and the second rack (177) are fixedly provided. The bars (177) are all meshed and connected with the gears (173); the driver (174) is connected with the first special-shaped draw plate (171) to drive the first special-shaped draw plate (171) to slide back and forth; the pads (160) are vertically slidably installed in the mounting holes (31) of the upper pad (30) in a one-to-one correspondence, the pads (160) and the punches are aligned and contacted one by one in the vertical direction, and the lower end of the second special-shaped draw plate (172) is provided with a recessed groove (1721) for the upper part of the pads (160) to fit in and be embedded; when the pads (160) and the recessed groove (1721) are vertically aligned, the punch aligned with the pads (160) is in an inoperative state, and when the pads (160) and the recessed groove (1721) are staggered in the vertical direction, the punch aligned with the pads (160) is in an operative state; The die fixing plate (60) is horizontally located below the punch fixing plate (40), and the die fixing plate (60) has a notch for the lower section of the punch to penetrate; A lower pad (70) is horizontally located below the die fixing plate (60), and the lower pad (70) is fixedly connected to the die fixing plate (60); The lower die base (20) is located below the lower pad (70), the lower die base (20) is fixedly connected to the lower pad (70), and the lower die base (20) is rotatably connected to the upper die base (10) via a vertical rotating assembly.

2. The multi-groove combined open indexing punching die for motor punching sheets according to claim 1, characterized in that: The punch (80) comprises a first flat-bottom square slot punch (100), a second flat-bottom square slot punch (120), a round-bottom conical slot punch (110) and a shearing punch (130), wherein the shearing punch (130) is used for shearing out the inner hole of the stator.

3. The multi-groove combined open indexing punching die for motor punching sheets according to claim 2, characterized in that: There are five first flat-bottomed square slot punches (100), five second flat-bottomed square slot punches (120), and five round-bottomed conical slot punches (110); the five first flat-bottomed square slot punches (100) are circumferentially arranged continuously on the punch fixing plate (40); the five second flat-bottomed square slot punches (120) are arranged continuously on the punch fixing plate (40); and the five round-bottomed conical slot punches (110) are arranged continuously on the punch fixing plate (40); The five first flat-bottomed square slot punches (100) are punches A-1 to A-5, and the adjustment devices (170) correspondingly connected to the five first flat-bottomed square slot punches (100) are adjustment devices a-1 to a-5; The five round-bottomed conical groove punches (110) are punches B-1 to B-5, and the adjusting devices (170) correspondingly connected to the five round-bottomed conical groove punches (110) are adjusting devices b-1 to b-5, respectively. The five second flat-bottomed square groove punches (120) are punches C-1 to C-5, and the adjusting devices (170) correspondingly connected to the five second flat-bottomed square groove punches (120) are adjusting devices c-1 to c-5.

4. The multi-groove combined open indexing punching die for motor punching sheets according to claim 1, characterized in that: The first rack (176) and the second rack (177) are both meshedly connected to the same side of the gear (173).

5. The multi-groove combined open indexing punching die for motor punching sheets according to claim 1, characterized in that: It also includes a stripper plate (50), which is elastically connected to the upper die base (10) via an elastic component (51).

6. A punching process for a motor punching sheet, characterized in that: The multi-slot combined open indexing punching die of claim 3 is used, and the punching process steps are as follows: Divide the stator or rotor into N equal parts according to the number of slots, position the ring with the ring shaft hole and keyway, adjust the punches needed on the die to the working state, and adjust other punches to the non-working state. The die drives the ring to rotate, and the ring is punched out in N consecutive rotations.

7. The punching process of a motor punching sheet according to claim 6, characterized in that: When the number of slots in the stator or rotor punching sheet is 60 and there are 3 slot shapes, the whole punching sheet is divided into 12 equal parts with 5 slots as a group. The die drives the ring sheet to rotate 12 times to punch. Each punch completes the punching of 5 slots and at the same time, the stator inner hole is sheared by 1 / 12. The die drives the ring sheet to rotate continuously to complete the punching of all slot shapes and the shearing of the stator inner hole. The process of realizing the combined punching of slot type CBABC is as follows: the A-3 punch is adjusted to the working state through the a-3 adjusting device; the B-2 and B-4 punches are adjusted to the working state through the b-2 and b-4 adjusting devices respectively; the C-1 and C-5 punches are adjusted to the working state through the c-1 and c-5 adjusting devices respectively; the remaining 10 punches are adjusted to the non-working state; the mold is installed on the open indexing punch press, the mold gap is adjusted, the mold is positioned with the axis hole, and the number of punches per rotation of the punch on the punch press is set to 12 to obtain a three-slot punch.

8. The punching process for a motor punching sheet according to claim 6, characterized in that: When the number of slots in the stator or rotor punching sheet is 60 and there are 2 slot shapes, the whole sheet is divided into 12 equal parts with 5 slots as a group. The die drives the ring sheet to rotate 12 times to punch. Each punch completes the punching of 5 slots and at the same time, the stator inner hole is sheared by 1 / 12. The die drives the ring sheet to rotate continuously to complete the punching of all slot shapes and the shearing of the stator inner hole. Realize the groove type ABABA combination punching process: adjust the A-1, A-3, and A-5 punches to the working state through the a-1, a-3, and a-5 adjustment devices, and adjust the B-2 and B-4 punches to the working state through the b-2 and b-4 adjustment devices; the remaining 10 punches are adjusted to the non-working state; install the mold on the open indexing punch press, adjust the mold gap, position it with the axis hole, set the number of punches per rotation of the punch on the punch press to 12, and obtain a double-slot punch.

9. The punching process for a motor punching sheet according to claim 6, characterized in that: When the number of slots in the stator or rotor punching sheet is 60 and the slot shape is 1, the whole punching sheet is divided into 12 equal parts with 5 slots as a group. The die drives the ring sheet to rotate 12 times to punch. Each punch completes the punching of 5 slots and at the same time, the stator inner hole is sheared by 1 / 12. The die drives the ring sheet to rotate continuously to complete the punching of all slots and the shearing of the stator inner hole. To realize the punching process of slot type B: adjust the B-1, B-2, B-3, B-4, and B-5 punches to the working state through the b-1, b-2, b-3, b-4, and b-5 adjustment devices; the other 10 punches are adjusted to the non-working state; install the mold on the open indexing punch press, adjust the mold gap, position it with the axis hole, set the number of punches per rotation of the punch on the punch press to 12, and obtain a single slot-shaped punch.

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