Stepping die for producing automobile belt pulley with positioning structure

Abstract

The present application belongs to the technical field of automobile parts stamping die, especially a stepping die with positioning structure for automobile pulley production, aiming at the problems of lacking full-process reference positioning in stepping die, easy accumulation of offset in blank transmission, difficult to adapt to size change in rigid clamping jaw, easy to damage surface in hard clamping, and difficult to ensure precision and qualified rate, the following scheme is proposed, including: tooling bottom plate, the upper side of the tooling bottom plate is fixedly connected with a bearing table, and a linear stamping multi-station is arranged above the bearing table. The stepping die with positioning structure for automobile pulley production has a bilateral synchronous driving and rigid transmission structure, which ensures the consistency of the step distance height of each station, effectively eliminates the accumulation of offset of the blank in the multi-station transmission, and adopts a self-adaptive flexible clamping unit to wrap the workpiece with elastic force, perfectly adapts to the size change after stamping, avoids damage to the surface in hard clamping, and effectively ensures the product machining precision and qualified rate.

Description

Technical Field

[0001] This invention relates to the field of stamping die technology for automotive parts, and in particular to a stepping die for the production of automotive pulleys with a positioning structure. Background Technology

[0002] In the production of automotive pulleys, the use of multi-station progressive dies for linear continuous stamping on the same press is a core process for achieving high-efficiency, mass production. Progressive dies integrate multiple processes such as punching, flanging, drawing, and shaping into different stations of a single die. In each stroke of the press, the material strip advances one step, and each station completes its corresponding processing simultaneously to obtain the finished product. Compared with traditional single-die production, this method significantly reduces equipment occupation, semi-finished product transfer, and labor costs, and has become the mainstream mode for pulley stamping production.

[0003] Existing stepping dies rely heavily on simple chutes or robotic arms for multi-station transfer, lacking a continuous transfer system across the entire process. When the blank is transferred linearly between stations, the geometric center is prone to cumulative offset, resulting in excessive radial and end-face runout of the finished product pulley. At the same time, clamping and transfer often use rigid grippers, which are difficult to adapt to slight changes in the external dimensions after stamping. Under high-speed cycles, rigid clamping can easily damage the workpiece surface, making it difficult to guarantee product processing accuracy and yield. Summary of the Invention

[0004] This invention discloses a stepper die for automobile pulley production with a positioning structure, aiming to solve the technical problems in the background art where stepper dies lack full-process reference positioning, the blank transfer is prone to accumulated offset leading to runout exceeding tolerance, and the rigid clamping jaws are difficult to adapt to slight dimensional changes, rigidly clamping easily damaged surfaces, making it difficult to guarantee accuracy and yield.

[0005] This invention proposes a stepper die for manufacturing automotive pulleys with a positioning structure, comprising: The tooling base plate has a support platform fixedly connected to its upper side, and a linear stamping multi-station is provided above the support platform. Lower molds are provided at equal intervals on one side of the linear stamping multi-station. A workstation reference positioning and transfer module is set above the tooling base plate. The workstation reference positioning and transfer module includes two tooling support plates, which are symmetrically and fixedly connected to the upper side of the tooling base plate. An initial positioning module is set on the upper side of the tooling base plate. The initial positioning module includes a feeding rack, which is fixedly connected to the upper side of the tooling base plate.

[0006] In a preferred embodiment, the workstation reference positioning and transfer module further includes: Two limiting rails are fixedly connected to one side of two tooling support plates respectively. Two opposing slide blocks are slidably connected to the outside of the two limiting rails. A tooling frame is provided on one side of the multiple opposing slide blocks. A guide seat is provided on one side of the multiple tooling frames. The same transmission slide rod is slidably connected inside the two guide seats located on the same side. Two workstation support plates are fixedly connected to one side of two transfer slide rods respectively. Tooling clamping transfer seats are equally spaced on one side of the two workstation support plates. Two adaptive round slide rods are slidably connected to one side of the tooling clamping transfer seat. A U-shaped frame is fixedly connected to one end of each of the two adaptive round slide rods. The same elastic clamping band is set inside the two U-shaped frames. The same telescopic spring is fixedly connected to the opposite side of the adaptive round slide rod and the tooling clamping transfer seat. Multiple support plates are fixedly connected to one side of multiple tooling clamping and transfer seats, with the support plates located below the tension clamping belt.

[0007] In a preferred embodiment, the workstation reference positioning and transfer module further includes: Multiple tooling plates are fixedly connected to one side of multiple opposing slides. Rollers are connected to one side of each tooling plate via bearings. Two rotating shafts are connected to one side of each tooling support plate via bearings. Circular cams are provided at one end of each rotating shaft. Two rotating shafts are connected to one side of each tooling support plate via bearings. Multiple linkage gears are fixedly connected to the outside of multiple rotating shafts. Each of the multiple rotating shafts and one end of the rotating shaft is fixedly connected to a pulley. The outside of two pulleys located on the same side is slidably connected to the same belt.

[0008] In a preferred embodiment, the workstation reference positioning and transfer module further includes: Two drive motors are symmetrically arranged on the upper side of the tooling base plate. Each drive motor has an adjusting gear at its drive end. The adjusting gear meshes with two linkage gears on one side of the adjusting gear. The linkage gears are located on both sides of the adjusting gear. Multiple L-shaped limiting plates are fixedly connected to both sides of two tooling support plates. Each L-shaped limiting plate has a slidingly connected abutting round rod on one side. One end of the abutting round rod is fixedly connected to one side of the tooling frame. The tooling frame and the opposite side of the L-shaped limiting plates are fixedly connected to the same tension spring.

[0009] In a preferred embodiment, the workstation reference positioning and transfer module further includes: Two limiting vertical rods are fixedly connected to one side of the port of two transmission slide rods respectively. The same guide slide column is slidably connected to one side of the two limiting vertical rods. A tooling block is fixedly connected to the outside of the middle of the guide slide column. A general-purpose motor is installed on one side of the tooling base plate. The drive end of the general-purpose motor is equipped with a rotating circular plate. An eccentric shaft is connected to one side of the rotating circular plate away from its center via a bearing. A linkage push-pull rod is movably connected to the outside of the eccentric shaft. One end of the linkage push-pull rod is movably connected to one side of the tooling block.

[0010] In a preferred embodiment, the workstation reference positioning and transfer module further includes: A stamping press is set above the support platform. Guide cylinders are set at equal intervals on one side of the stamping press. The same lifting pressure plate is slidably connected to the outside of two guide cylinders on the same side. An upper mold is set on one side of the lifting pressure plate. Electric telescopic rods are set at equal intervals on one side of the stamping press. The drive end of the electric telescopic rod is fixedly connected to one side of the lifting pressure plate. Multiple guide rods are slidably connected to one side of multiple lifting pressure plates. One end of two guide rods on the same side is fixedly connected to the same limiting lower pressure plate. The limiting lower pressure plate is located on the periphery of the upper mold. Two telescopic springs are fixedly connected to the opposite side of the limiting lower pressure plate and the lifting pressure plate. The telescopic springs are located outside the guide rods.

[0011] In a preferred embodiment, the initial positioning module further includes: The tooling conveyor plate is fixedly connected to one side of the feed rack. There is a slide groove on one side of the tooling conveyor plate. A conveying slide is slidably connected inside the slide groove. An electric hydraulic cylinder is installed on one side of the conveying slide. The positioning plate is fixedly connected to the drive end of the electric hydraulic cylinder. One side of the positioning plate has smooth openings at equal intervals around the circumference. Negative pressure pipes are slidably connected inside the multiple smooth openings. Three telescopic springs are fixedly connected to the negative pressure pipes and the opposite side of the positioning plate.

[0012] In a preferred embodiment, the initial positioning module further includes: Multiple suction heads are fixedly connected to one end of multiple negative pressure tubes, and the other end of the multiple negative pressure tubes is fixedly connected to the same connecting tube. A pump body is set on one side of the positioning plate, and the negative pressure end of the pump body is connected to the inside of the connecting tube through a hose. Multiple positioning sliders are equidistantly connected to one side of a positioning plate. Each of the positioning sliders is fixedly connected to an arc-shaped push plate. Electric telescopic cylinders are equidistantly arranged on one side of the positioning plate. The drive end of the electric telescopic cylinder is fixedly connected to one side of the positioning slider.

[0013] In a preferred embodiment, the initial positioning module further includes: Two guide plates are fixedly connected to one side of the tooling transmission plate, and the same lead screw is connected to one side of the two guide plates through bearings; The lead screw motor is located on one side of the tooling transmission plate, and the drive end of the lead screw motor is connected to one end of the lead screw via a coupling.

[0014] In a preferred embodiment, the initial positioning module further includes: The nut block is fixedly connected to one side of the conveyor slide.

[0015] As can be seen from the above, the stepper mold for automobile pulley production with positioning structure provided by the present invention has a double-sided synchronous drive and rigid transmission structure to ensure that the step height of each station is consistent, effectively eliminating the cumulative offset of the blank in the multi-station transmission, significantly reducing the risk of radial and end face runout of the finished product. At the same time, it adopts an adaptive flexible clamping unit to wrap the workpiece with elastic force, perfectly adapting to the slight changes in size after stamping, avoiding damage to the surface by hard clamping, and effectively ensuring the beneficial effects of product processing accuracy and pass rate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of a stepper die with a positioning structure for producing automotive pulleys, as proposed in this invention. Figure 2 This is a side view of a stepper die with a positioning structure for producing automotive pulleys, as proposed in this invention. Figure 3 This is a schematic diagram of a station reference positioning and transfer module structure for a stepping die with a positioning structure for automobile pulley production, as proposed in this invention. Figure 4 for Figure 3 A magnified structural diagram of part A; Figure 5 This is a schematic diagram of a partial structure of a station reference positioning and transfer module for a stepper die used in the production of automotive pulleys with a positioning structure, as proposed in this invention. Figure 6 for Figure 5 A schematic diagram of the enlarged structure of part B; Figure 7 This is a schematic diagram of the tooling support plate of a stepping die for producing automotive pulleys with a positioning structure, as proposed in this invention. Figure 8 for Figure 5 A magnified structural diagram of part C; Figure 9 This is a schematic diagram of the initial positioning module structure of a stepper die with a positioning structure for automobile pulley production, as proposed in this invention. Figure 10 This is a schematic diagram of the initial positioning module of a stepping die for producing automotive pulleys with a positioning structure, as proposed in this invention.

[0017] In the diagram: 1. Fixture base plate; 2. Support platform; 3. Stamping machine; 4. Station reference positioning and transfer module; 401. Fixture support plate; 402. Limiting rail; 403. Opposing slide; 404. Fixture frame; 405. Guide seat; 406. L-limiting plate; 407. Abutting round rod; 408. Tension spring; 409. Fixture plate; 410. Roller; 411. Rotating shaft; 412. Circumferential convexity 413. Wheel; 414. Shaft; 415. Linkage gear; 416. Belt; 417. Adjusting gear; 418. Transmission slide bar; 419. Tooling clamping and transmission seat; 420. Adaptive circular slide bar; 421. Telescopic spring; 422. U-shaped frame; 423. Tightening clamping belt; 424. Support plate; 425. Limiting vertical bar; 426. Guide circular column; 427. Rotating circular plate; 428. Linkage 428. Push-pull rod; 429. Eccentric shaft; 430. Tooling block; 431. Guide rod; 432. Telescopic spring II; 433. Limiting lower pressure plate; 5. Initial positioning module; 501. Feed rack; 502. Tooling transmission plate; 503. Guide plate; 504. Lead screw; 505. Lead screw motor; 506. Conveyor slide; 507. Nut block; 508. Electric hydraulic cylinder; 509. Positioning plate; 510. Positioning slider; 511. Arc-shaped push plate; 512. Electric telescopic cylinder; 513. Negative pressure pipe; 514. Suction head; 515. Telescopic spring III; 516. Connecting pipe; 517. Pump body; 6. Guide cylinder; 7. Lifting pressure plate; 8. Electric telescopic rod; 9. Upper mold; 10. Linear stamping multi-station; 11. Lower mold; 12. Drive motor; 13. Station support plate; 14. General motor. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] The stepper die for automotive pulley production with a positioning structure disclosed in this invention is mainly used in scenarios where stepper dies lack full-process reference positioning, blank transfer is prone to accumulated offset leading to runout exceeding tolerance, and rigid clamping jaws are difficult to adapt to slight dimensional changes, rigidly clamping easily damaged surfaces, making it difficult to guarantee accuracy and pass rate.

[0020] Reference Figures 1-10 A stepper die for producing automotive pulleys with a positioning structure, comprising: Tooling base plate 1, a bearing platform 2 is fixedly connected to the upper side of tooling base plate 1, and a linear stamping multi-station 10 is provided above the bearing platform 2. A lower mold 11 is provided at equal distances on one side of the linear stamping multi-station 10. The workstation reference positioning and transfer module 4 is set above the tooling base plate 1. The workstation reference positioning and transfer module 4 includes two tooling support plates 401, which are symmetrically and fixedly connected to the upper side of the tooling base plate 1. The initial positioning module 5 is set on the upper side of the tooling base plate 1. The initial positioning module 5 includes a feeding rack 501, which is fixedly connected to the upper side of the tooling base plate 1.

[0021] Reference Figures 1-8 In a preferred embodiment, the workstation reference positioning and transfer module 4 further includes: Two limiting rails 402 are fixedly connected to one side of two tooling support plates 401 respectively. Two opposing slide blocks 403 are slidably connected to the outside of the two limiting rails 402. A tooling frame 404 is provided on one side of the multiple opposing slide blocks 403. A guide seat 405 is provided on one side of the multiple tooling frames 404. The same transmission slide rod 417 is slidably connected inside the two guide seats 405 located on the same side. Two workstation support plates 13 are fixedly connected to one side of two transfer slide bars 417 respectively. Tooling clamping transfer seats 418 are provided at equal distances on one side of the two workstation support plates 13. Two adaptive round slide bars 419 are slidably connected to one side of the tooling clamping transfer seat 418. A U-shaped frame 421 is fixedly connected to one end of each of the two adaptive round slide bars 419. The same elastic clamping band 422 is provided inside the two U-shaped frames 421. The same telescopic spring 420 is fixedly connected to the opposite side of the adaptive round slide bar 419 and the tooling clamping transfer seat 418. Multiple support plates 423 are fixedly connected to one side of multiple tooling clamping and transfer seats 418, and the support plates 423 are located below the tension clamping belt 422.

[0022] Reference Figures 1-8 In a preferred embodiment, the workstation reference positioning and transfer module 4 further includes: Multiple tooling plates 409 are fixedly connected to one side of multiple opposing slides 403. Each side of the multiple tooling plates 409 is connected to a roller 410 via a bearing. Each side of the two tooling support plates 401 is connected to two rotating shafts 411 via a bearing. Each end of the multiple rotating shafts 411 is provided with a circumferential cam 412. Each side of the two tooling support plates 401 is connected to two rotating shafts 413 via a bearing. Multiple linkage gears 414 are fixedly connected to the outside of multiple rotating shafts 413 respectively. Each of the multiple rotating shafts 413 and one end of the rotating shaft 411 is fixedly connected to a pulley. The outside of two pulleys located on the same side is slidably connected to the same belt 415.

[0023] Reference Figures 1-8In a preferred embodiment, the workstation reference positioning and transfer module 4 further includes: Two drive motors 12 are symmetrically arranged on the upper side of the tooling base plate 1. Each drive end of the two drive motors 12 is provided with an adjusting gear 416. The adjusting gear 416 meshes with two linkage gears 414 on one side of it. The linkage gears 414 are located on both sides of the adjusting gear 416. Multiple L-limiting plates 406 are fixedly connected to both sides of two tooling support plates 401. Each L-limiting plate 406 has a slidingly connected abutting round rod 407 on one side. One end of the abutting round rod 407 is fixedly connected to one side of the tooling frame 404. The tooling frame 404 and the opposite side of the L-limiting plate 406 are fixedly connected to the same tension spring 408.

[0024] Reference Figures 1-8 In a preferred embodiment, the workstation reference positioning and transfer module 4 further includes: Two limiting vertical rods 424 are fixedly connected to one side of the port of two transmission slide rods 417 respectively. The same guide slide post 425 is slidably connected to one side of the two limiting vertical rods 424. A tooling block 429 is fixedly connected to the middle of the guide slide post 425. A general-purpose motor 14 is set on one side of the tooling base plate 1. The drive end of the general-purpose motor 14 is provided with a rotating circular plate 426. One side of the rotating circular plate 426 away from its center is connected to an eccentric shaft 428 through a bearing. A linkage push-pull rod 427 is movably connected to the outside of the eccentric shaft 428. One end of the linkage push-pull rod 427 is movably connected to one side of the tooling block 429.

[0025] Reference Figures 1-8 In a preferred embodiment, the workstation reference positioning and transfer module 4 further includes: The stamper 3 is positioned above the support platform 2. Guide cylinders 6 are equidistantly arranged on one side of the stamper 3. The two guide cylinders 6 on the same side are slidably connected to the same lifting pressure plate 7. An upper mold 9 is provided on one side of the lifting pressure plate 7. Electric telescopic rods 8 are equidistantly arranged on one side of the stamper 3. The driving end of the electric telescopic rod 8 is fixedly connected to one side of the lifting pressure plate 7. Multiple guide rods 430 are slidably connected to one side of multiple lifting pressure plates 7. One end of two guide rods 430 located on the same side is fixedly connected to the same limiting lower pressure plate 432. The limiting lower pressure plate 432 is located on the periphery of the upper mold 9. Two telescopic springs 431 are fixedly connected to the opposite side of the limiting lower pressure plate 432 and the lifting pressure plate 7. The telescopic springs 431 are located outside the guide rods 430.

[0026] Specifically, the workstation reference positioning and transfer module 4 is responsible for the precise transfer and clamping of blanks or semi-finished products between multiple stamping stations using a unified reference. Its workflow includes two core coordinated actions: transfer and clamping. The general-purpose motor 14 starts, driving the rotating plate 426 to rotate. The rotating plate 426 converts the rotational motion into the reciprocating push-pull motion of the linkage push-pull rod 427 through the eccentric shaft 428 on it. The linkage push-pull rod 427 drives the guide slide column 425 to perform stable reciprocating linear motion under the guidance of the limit vertical rods 424 on both sides through the tooling block 429. The linear motion of the guide slide column 425... The synchronous motion drives the two transfer slide bars 417 to slide within the guide seats 405 on both sides, thereby driving the two workstation bearing plates 13 and all the tooling clamping transfer seats 418 on them to reciprocate along the workstation arrangement direction, i.e., the stepping direction. When the transfer slide bar 417 moves one step in one direction, all the tooling clamping transfer seats 418 transfer the processed semi-finished products from the current workstation to the next workstation, realizing precise stepping motion. While the transfer slide bar 417 slides, the drive motor 12 drives the linkage gears 414 on both sides to rotate synchronously through the adjusting gear 416. 4. Power is transmitted to the rotating shaft 411 via a transmission system consisting of a rotating shaft 413, pulleys, and a belt 415, causing the circumferential cam 412 to rotate. During rotation, the cam surface of the circumferential cam 412 abuts against the roller 410 fixed on the tooling plate 409. Driven by the cam profile, the tooling plate 409 drives the opposing slide 403 to slide along the limiting track 402 towards the workpiece. The sliding of the opposing slide 403 is transmitted to the guide seat 405 through the tooling frame 404, ultimately causing the tooling clamping and transfer seats 418 on both sides to move closer to the center, thus clamping the workpiece. During the clamping process... In the process, the tension clamping band 422 first contacts the workpiece surface. As the clamping force increases, the U-shaped frame 421 compresses the telescopic spring 420 on the adaptive slide bar 419, so that the tension clamping band 422 can adaptively adjust according to the slight changes in the workpiece's shape and size, forming a flexible wrapping clamping on the workpiece. At the same time, the support plate 423 supports the workpiece from below to ensure the stability of the clamping. When the circumferential cam 412 continues to rotate to the return section, under the elastic force of the tension spring 408, the opposing slide 403 returns to the outside, and the tension clamping band 422 releases the workpiece, completing a clamping and releasing cycle. In specific application scenarios, this module uses a common drive system, a universal motor 14, and a linkage push-pull rod 427 to synchronously drive all station bearing plates 13 to perform linear reciprocating motion, ensuring that the transmission distance, step distance, and height of each step are consistent. At the same time, the transmission slide rods 417 on both sides and the tooling clamping transmission seat 418 adopt a symmetrical and rigid connection structure, so that the clamping center line of each station is consistent, fundamentally eliminating the cumulative offset of the geometric center caused by multiple positioning during the transfer of the billet in multiple stations, significantly improving the radial and end face runout accuracy of the finished product pulley, and creatively adopting a flexible system composed of an adaptive circular slide rod 419, a telescopic spring 420, and a tension clamping band 422. The clamping unit, with its elastic clamping band 422, can adaptively adjust via a compression spring according to the microscopic changes in the dimensions of the stamped semi-finished product. This uniformly wraps the workpiece with elastic force, avoiding hard squeezing and damage to the workpiece surface caused by rigid grippers. It is especially suitable for semi-finished products with slight surface deformation after stamping. Through the cooperation of the circumferential cam 412 and the roller 410, combined with the reset function of the tension spring 408, perfect synchronization of the clamping and transmission actions in terms of timing is achieved. The profile curve of the cam can precisely control the timing, speed, and force of clamping, ensuring clamping during transmission and yielding during stamping. The actions are continuous, high-speed, and reliable, meeting the needs of mass automated production.

[0027] Reference Figure 1 , Figure 9 and Figure 10 In a preferred embodiment, the initial positioning module 5 further includes: The tooling conveyor plate 502 is fixedly connected to one side of the feed rack 501. There is a slide groove on one side of the tooling conveyor plate 502. A conveying slide 506 is slidably connected inside the slide groove. An electric hydraulic cylinder 508 is provided on one side of the conveying slide 506. Positioning plate 509 is fixedly connected to the drive end of electric hydraulic cylinder 508. One side of positioning plate 509 has smooth openings at equal intervals around the circumference. Negative pressure pipes 513 are slidably connected inside the multiple smooth openings. Telescopic springs 515 are fixedly connected to the opposite side of positioning plate 509 and negative pressure pipes 513.

[0028] Reference Figure 1 , Figure 9 and Figure 10 In a preferred embodiment, the initial positioning module 5 further includes: Multiple suction heads 514 are fixedly connected to one end of multiple negative pressure tubes 513 respectively. The other end of the multiple negative pressure tubes 513 is fixedly connected to the same connecting tube 516. A pump body 517 is provided on one side of the positioning plate 509. The negative pressure end of the pump body 517 is connected to the inside of the connecting tube 516 through a flexible hose. Multiple positioning sliders 510 are slidably connected to one side of the positioning plate 509 at equal intervals around the circumference. An arc-shaped push plate 511 is fixedly connected to one side of each of the multiple positioning sliders 510. An electric telescopic cylinder 512 is equidistantly arranged on one side of the positioning plate 509 around the circumference. The drive end of the electric telescopic cylinder 512 is fixedly connected to one side of the positioning slider 510.

[0029] Reference Figure 9 and Figure 10 In a preferred embodiment, the initial positioning module 5 further includes: Two guide plates 503 are fixedly connected to one side of the tooling transmission plate 502, and the same lead screw 504 is connected to one side of the two guide plates 503 through bearings. The lead screw motor 505 is located on one side of the tooling transmission plate 502, and the drive end of the lead screw motor 505 is connected to one end of the lead screw 504 via a coupling.

[0030] Reference Figure 9 In a preferred embodiment, the initial positioning module 5 further includes: Nut block 507 is fixedly connected to one side of the conveyor slide 506.

[0031] Specifically, firstly, the single blank to be processed enters the predetermined picking position of the tooling conveyor plate 502 through the feeding rack 501. At this time, the lead screw motor 505 starts, driving the lead screw 504 to rotate. Through the threaded engagement with the nut block 507, it precisely controls the horizontal movement of the conveying slide 506 in the first slide groove, moving the positioning plate 509 to directly above the blank. Subsequently, the electric hydraulic cylinder 508 extends, driving the positioning plate 509 to move vertically downward until multiple suction heads 514 contact the upper surface of the blank below. During this process, the negative pressure pipe 513 can slide upward along the rounded opening and compress the telescopic spring 3 515. The spring's buffering effect prevents the suction head 514 from rigidly colliding with the blank, protecting the blank surface. Before adsorption, multiple electric telescopic cylinders 512 extend synchronously, pushing the positioning slider 510 to slide radially along the positioning plate 509, driving the arc-shaped push plate 511 to move centripetally. Multiple arc-shaped push plates 511 simultaneously push the outer edge of the blank inward from the circumferential direction. The curved working surface of the platen 509 is used to automatically center and correct the position of the blank, ensuring that the geometric center of the blank coincides with the preset reference axis of the positioning plate 509, thus completing the high-precision initial positioning. Then, the pump body 517 is started, and negative pressure is generated at the suction head 514 through the connecting pipe 516 and the negative pressure pipe 513, thereby firmly adsorbing the blank. After centering and adsorption are completed, the screw motor 505 is started again, driving the positioning plate 509 to move horizontally along the positioning direction to directly above the first lower die 11 of the linear stamping multi-station 10. Then, the electric hydraulic cylinder 508 extends again, vertically lowering the positioning plate 509 to the preset release height. The pump body 517 stops working, the suction head 514 releases the negative pressure, and the blank falls smoothly onto the cavity or support surface of the first lower die 11 under the action of gravity. Finally, the electric hydraulic cylinder 508 retracts, driving the positioning plate 509 to rise and reset. A complete positioning-picking-transfer-release cycle ends, and the blank is ready for stamping in a precise posture. In specific application scenarios, the combination design of negative pressure adsorption and circumferential synchronous centering enables precise control of the pre-positioning and subsequent transfer of individual blanks, ensuring that the geometric center of each blank entering the stamping process is strictly aligned with the processing datum of the first lower die 11. This fundamentally eliminates the initial processing error caused by the deviation of the loading position, providing a high-precision starting point for subsequent multi-station progressive stamping.

[0032] Working principle: First, the single blank to be processed enters the predetermined picking position of the tooling conveyor plate 502 through the feeding rack 501. At this time, the lead screw motor 505 starts, driving the lead screw 504 to rotate. Through the threaded engagement with the nut block 507, it precisely controls the horizontal movement of the conveying slide 506 in the slide groove, moving the positioning plate 509 directly above the blank. Subsequently, the electric hydraulic cylinder 508 extends, driving the positioning plate 509 to move vertically downward until multiple suction heads 514 contact the upper surface of the blank below. During this process, the negative pressure pipe 513 can slide upward along the smooth opening and compress the telescopic spring 3 515. The spring's buffering effect prevents the suction heads 514 from rigidly colliding with the blank, protecting the blank surface. Before adsorption, multiple... One electric telescopic cylinder 512 extends synchronously, pushing the positioning slider 510 to slide radially along the positioning plate 509, causing the arc-shaped push plate 511 to move centripetally. Multiple arc-shaped push plates 511 simultaneously push the outer edge of the blank inward from the circumferential direction, using their arc-shaped working surfaces to achieve automatic centering and position correction of the blank, ensuring that the geometric center of the blank coincides with the preset reference axis of the positioning plate 509, completing high-precision initial positioning. Then, the pump body 517 starts, generating negative pressure at the suction head 514 through the connecting pipe 516 and the negative pressure pipe 513, thereby firmly adsorbing the blank. After centering and adsorption are completed, the lead screw motor 505 starts again, driving the positioning plate 509 to move horizontally along the positioning direction to directly above the first lower die 11 of the linear stamping multi-station 10. Subsequently, the electric hydraulic cylinder 508 extends again, vertically lowering the positioning plate 509 to the preset release height. The pump body 517 stops working, the suction head 514 releases negative pressure, and the blank falls smoothly onto the cavity or support surface of the first lower die 11 under gravity. Finally, the electric hydraulic cylinder 508 retracts, driving the positioning plate 509 to rise and reset, completing a full positioning-picking-transfer-release cycle. The blank awaits stamping in a precise posture. After the first blank is placed in the lower die 11 on the linear stamping multi-station 10, the general-purpose motor 14 starts, driving the rotating circular plate 426 to rotate. The rotating circular plate 426 converts the rotational motion into the reciprocating push-pull motion of the linkage push-pull rod 427 through the eccentric shaft 428 on it. The linkage push-pull rod 427, through the working... The mounting block 429 drives the guide slide column 425 to perform stable reciprocating linear motion under the guidance of the limiting vertical rods 424 on both sides. The linear motion of the guide slide column 425 synchronously drives the two transfer slide rods 417 to slide in the guide seats 405 on both sides, thereby driving the two station bearing plates 13 and all the tooling clamping transfer seats 418 on them to move back and forth along the station arrangement direction, i.e., the stepping direction. When the transfer slide rod 417 moves one step in one direction, all the tooling clamping transfer seats 418 will transfer the processed semi-finished products from the current station to the next station, realizing precise stepping action. While the transfer slide rod 417 slides, the drive motor 12 drives the linkage gears 414 on both sides to rotate synchronously through the adjusting gear 416.The linkage gear 414 transmits power to the rotating shaft 411 through a transmission system consisting of a rotating shaft 413, a pulley, and a belt 415, driving the circumferential cam 412 to rotate. During rotation, the cam surface of the circumferential cam 412 abuts against the roller 410 fixed on the tooling plate 409. Driven by the cam profile, the tooling plate 409 drives the opposing slide 403 to slide along the limiting track 402 towards the workpiece. The sliding of the opposing slide 403 is transmitted to the guide seat 405 through the tooling frame 404, ultimately causing the tooling clamping and transfer seats 418 on both sides to move closer to the center, thus clamping the workpiece. During the holding process, the tensioning clamping band 422 first contacts the workpiece surface. As the clamping force increases, the U-shaped frame 421 compresses the telescopic spring 420 on the adaptive slide rod 419, allowing the tensioning clamping band 422 to adaptively adjust according to slight changes in the workpiece's dimensions, forming a flexible, wrapping clamp on the workpiece. Simultaneously, the support plate 423 supports the workpiece from below, ensuring clamping stability. When the circumferential cam 412 continues to rotate to the return stroke, under the elastic force of the tension spring 408, the opposing slide 403 returns to its original position outwards, and the tensioning clamping band 422 releases the workpiece, completing one clamping and releasing cycle.

[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A stepping die for producing automotive pulleys with a positioning structure, characterized in that, include: Tooling base plate (1), the upper side of the tooling base plate (1) is fixedly connected to a support platform (2), and a linear stamping multi-station (10) is provided above the support platform (2), and a lower mold (11) is provided at equal distances on one side of the linear stamping multi-station (10). The workstation reference positioning and transfer module (4) is set above the tooling base plate (1). The workstation reference positioning and transfer module (4) includes two tooling support plates (401), which are symmetrically fixedly connected to the upper side of the tooling base plate (1). The workstation reference positioning and transfer module (4) also includes: Two limiting rails (402) are fixedly connected to one side of two tooling support plates (401). Two opposing slides (403) are slidably connected to the outside of the two limiting rails (402). A tooling frame (404) is provided on one side of the multiple opposing slides (403). A guide seat (405) is provided on one side of the multiple tooling frames (404). The same transmission slide rod (417) is slidably connected inside the two guide seats (405) located on the same side. Two workstation support plates (13) are fixedly connected to one side of two transfer slide rods (417). Tooling clamping transfer seats (418) are provided at equal distances on one side of the two workstation support plates (13). Two adaptive round slide rods (419) are slidably connected to one side of the tooling clamping transfer seat (418). A U-shaped frame (421) is fixedly connected to one end of each of the two adaptive round slide rods (419). The same elastic clamping band (422) is provided inside the two U-shaped frames (421). The same telescopic spring (420) is fixedly connected to the opposite side of the adaptive round slide rod (419) and the tooling clamping transfer seat (418). Multiple support plates (423) are fixedly connected to one side of multiple tooling clamping and transfer seats (418), and the support plates (423) are located below the tension clamping band (422); An initial positioning module (5) is set on the upper side of the tooling base plate (1). The initial positioning module (5) includes a feeding rack (501), which is fixedly connected to the upper side of the tooling base plate (1).

2. The stepper die for producing automotive pulleys with a positioning structure according to claim 1, characterized in that, The workstation reference positioning and transfer module (4) also includes: Multiple tooling plates (409) are fixedly connected to one side of multiple opposing slides (403). Each side of the multiple tooling plates (409) is connected to a roller (410) via a bearing. Each side of the two tooling support plates (401) is connected to two rotating shafts (411) via a bearing. Each end of the multiple rotating shafts (411) is provided with a circumferential cam (412). Each side of the two tooling support plates (401) is connected to two rotating shafts (413) via a bearing. Multiple linkage gears (414) are fixedly connected to the outside of multiple rotating shafts (413). Each of the multiple rotating shafts (413) and one end of the rotating shaft (411) is fixedly connected to a pulley. The two pulleys on the same side are slidably connected to the outside of the same belt (415).

3. The stepper die for producing automotive pulleys with a positioning structure according to claim 2, characterized in that, The workstation reference positioning and transfer module (4) also includes: Two drive motors (12) are symmetrically arranged on the upper side of the tooling base plate (1). The drive ends of the two drive motors (12) are equipped with adjusting gears (416). The adjusting gears (416) mesh with two linkage gears (414) on one side of the adjusting gears (416). The linkage gears (414) are located on both sides of the adjusting gears (416). Multiple L-limit plates (406) are fixedly connected to both sides of two tooling support plates (401). Each L-limit plate (406) has a slidingly connected abutting round rod (407) on one side. One end of the abutting round rod (407) is fixedly connected to one side of the tooling frame (404). The tooling frame (404) and the opposite side of the L-limit plate (406) are fixedly connected to the same tension spring (408).

4. The stepper die for producing automotive pulleys with a positioning structure according to claim 3, characterized in that, The workstation reference positioning and transfer module (4) also includes: Two limiting vertical rods (424) are fixedly connected to one side of the port of two transmission slide rods (417), and the same guide slide column (425) is slidably connected to one side of the two limiting vertical rods (424). A tooling block (429) is fixedly connected to the middle of the guide slide column (425). A general-purpose motor (14) is set on one side of the tooling base plate (1). The drive end of the general-purpose motor (14) is provided with a rotating circular plate (426). One side of the rotating circular plate (426) away from its center is connected to an eccentric shaft (428) through a bearing. The external side of the eccentric shaft (428) is movably connected to a linkage push-pull rod (427). One end of the linkage push-pull rod (427) is movably connected to one side of the tooling block (429).

5. A stepping die for producing automotive pulleys with a positioning structure according to claim 4, characterized in that, The workstation reference positioning and transfer module (4) also includes: A stamper (3) is set above the support platform (2). Guide cylinders (6) are set at equal distances on one side of the stamper (3). The two guide cylinders (6) on the same side are slidably connected to the same lifting pressure plate (7). An upper mold (9) is set on one side of the lifting pressure plate (7). Electric telescopic rods (8) are set at equal distances on one side of the stamper (3). The driving end of the electric telescopic rod (8) is fixedly connected to one side of the lifting pressure plate (7). Multiple guide rods (430) are slidably connected to one side of multiple lifting pressure plates (7). One end of two guide rods (430) on the same side is fixedly connected to the same limiting lower pressure plate (432). The limiting lower pressure plate (432) is located on the periphery of the upper mold (9). Two telescopic springs (431) are fixedly connected to the opposite side of the limiting lower pressure plate (432) and the lifting pressure plate (7). The telescopic springs (431) are located outside the guide rods (430).

6. A stepping die for producing automotive pulleys with a positioning structure according to claim 1, characterized in that, The initial positioning module (5) also includes: The tooling transfer plate (502) is fixedly connected to one side of the feed rack (501). There is a slide groove on one side of the tooling transfer plate (502). A conveying slide (506) is slidably connected inside the slide groove. An electric hydraulic cylinder (508) is provided on one side of the conveying slide (506). The positioning plate (509) is fixedly connected to the drive end of the electric hydraulic cylinder (508). One side of the positioning plate (509) has rounded openings at equal intervals around the circumference. The interior of each rounded opening is slidably connected to a negative pressure pipe (513). The negative pressure pipe (513) and the opposite side of the positioning plate (509) are fixedly connected to a telescopic spring (515).

7. A stepping die for producing automotive pulleys with a positioning structure according to claim 6, characterized in that, The initial positioning module (5) also includes: Multiple suction heads (514) are fixedly connected to one end of multiple negative pressure tubes (513), and the other end of multiple negative pressure tubes (513) is fixedly connected to the same connecting tube (516). A pump body (517) is provided on one side of the positioning plate (509), and the negative pressure end of the pump body (517) is connected to the inside of the connecting tube (516) through a flexible hose. Multiple positioning sliders (510) are equidistantly connected to one side of the positioning plate (509). An arc-shaped push plate (511) is fixedly connected to one side of each of the multiple positioning sliders (510). An electric telescopic cylinder (512) is equidistantly arranged on one side of the positioning plate (509). The driving end of the electric telescopic cylinder (512) is fixedly connected to one side of the positioning slider (510).

8. A stepping die for producing automotive pulleys with a positioning structure according to claim 7, characterized in that, The initial positioning module (5) also includes: Two guide plates (503) are fixedly connected to one side of the tooling transmission plate (502), and the same lead screw (504) is connected to one side of the two guide plates (503) through bearings. A lead screw motor (505) is located on one side of the tooling transmission plate (502), and the drive end of the lead screw motor (505) is connected to one end of the lead screw (504) via a coupling.

9. A stepping die for producing automotive pulleys with a positioning structure according to claim 8, characterized in that, The initial positioning module (5) also includes: Nut block (507) is fixedly connected to one side of the conveyor slide (506).

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