A high-precision spinning mold for automobile special-shaped parts

Abstract

The invention discloses a high-precision spinning forming die for automobile special-shaped parts, comprising an upper die device and a lower die device; the upper die device comprises an upper die plate and a male die core rotatably arranged at the center of the upper die plate; the lower die device comprises a lower die seat, a female die arranged on the lower die seat, a rotating member coaxially rotating and penetrating the female die, a first spinning mechanism arranged at the top of the female die, a plurality of second spinning mechanisms circumferentially distributed on the female die, and a limiting mechanism arranged at the outer periphery of the female die and used for limiting the plurality of second spinning mechanisms; a transmission mechanism is arranged between the rotating member and the first spinning mechanism, a first spring is arranged between the rotating member and the female die, and the rotating member rotates relative to the female die when moving downward and can apply downward pressure to the limiting mechanism; the invention effectively reduces the stress on the blank workpiece during deep drawing, so that the blank workpiece can be continuously deep drawn, and then the deep drawing forming of the workpiece is completed in one set of dies at one time, the production efficiency is improved, the production cost is reduced, and the deep drawing forming precision is high.

Description

Technical Field

[0001] The invention relates to the technical field of metal machining, in particular to a high-precision spinning forming die for automobile special-shaped parts. Background Art

[0002] The spinning process makes the blank workpiece rotate with the spindle of the machine tool while applying pressure to the blank workpiece through a spinning wheel or a driving rod, so that the blank workpiece is plastically deformed into various required rotating bodies. However, the spinning process requires the blank workpiece to be spun multiple times to gradually achieve the desired shape, which is time-consuming and has high operating requirements. The drawing process directly draws the blank workpiece through extrusion. During the drawing process, the mold needs to be replaced multiple times for pressing to prevent the blank from breaking, and the operation is complicated.

[0003] The outer steel sheet of the existing automobile exhaust pipe is a multi-layer deep-drawn trapezoid with a large drawing depth. Multiple deep drawing is required during production, and the mold needs to be replaced multiple times for deep drawing, resulting in low production efficiency and high production cost. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a high-precision spinning forming mold for automobile special-shaped parts, which effectively reduces the stress on the blank workpiece during deep drawing, enables the blank workpiece to be continuously drawn, and then completes the deep drawing of the workpiece in one set of molds at one time, thereby improving production efficiency and reducing production costs.

[0005] To achieve the above object, the specific scheme of the present invention is as follows:

[0006] A high-precision spinning mold for automobile special-shaped parts, comprising an upper mold device and a lower mold device; the upper mold device comprises an upper mold plate and a male mold core rotatably arranged at the center of the upper mold plate;

[0007] The lower die device includes a lower die base, a die disposed on the lower die base, a rotating member coaxially rotating and passing through the die, a first spinning mechanism disposed on the top of the die, a plurality of second spinning mechanisms circumferentially distributed on the die, and a limiting mechanism disposed on the outer periphery of the die and used to limit the plurality of second spinning mechanisms; a transmission mechanism is provided between the rotating member and the first spinning mechanism, a first spring is provided between the rotating member and the die, and the rotating member rotates relative to the die when moving downward and can apply downward pressure to the limiting mechanism.

[0008] Optionally, the first spinning mechanism includes a rotating ring rotatably arranged on the concave mold and a plurality of first rollers circumferentially arranged on the top of the rotating ring, and the axes of the first rollers are arranged to tilt outwards;

[0009] The rotating member synchronously drives the rotating ring to rotate in the opposite direction through the transmission mechanism.

[0010] Optionally, the rotating part is a screw, a clamping platform is arranged on the top of the screw, a nut is fixedly embedded on the bottom of the lower die seat, and the nut is threadedly sleeved with the screw;

[0011] The transmission mechanism includes a first gear and a second gear rotatably arranged at the bottom of the lower mold base, the first gear is threadedly sleeved with the screw rod, the second gear is meshed with the first gear, the second gear is coaxially sleeved with a transmission rod, the end of the transmission rod away from the second gear is sleeved with a third gear, the third gear is meshed with a fourth gear, and the fourth gear is meshed with a rotating ring.

[0012] Optionally, the second spinning mechanism includes a connecting rod slidably arranged on the outer periphery of the die, an upper spinning slide arm and a lower spinning slide arm are connected to both ends of the connecting rod, the upper spinning slide arm and the lower spinning slide arm are respectively slidably arranged in the die corresponding to the stretching position of the die, the inner ends of the upper spinning slide arm and the lower spinning slide arm are both axially connected to a second roller, the axis of the second roller is parallel to the axis of the die, and a second spring is respectively connected between the upper spinning slide arm and the lower spinning slide arm and the outer wall of the die;

[0013] The upper spinning slide arm and the lower spinning slide arm overcome the elastic force of the second spring under the action of the limiting mechanism to drive the second roller to extend into the forming cavity of the concave mold.

[0014] Optionally, the second spinning mechanism further includes a guide rail seat, a slide groove is provided in the guide rail seat, and the upper end of the connecting rod is slidably connected in the slide groove.

[0015] Optionally, the limiting mechanism includes a limiting frame arranged at the bottom of the die, the limiting frame is provided with an L-shaped guide arm corresponding to each second spinning mechanism, the limiting frame is provided with an avoidance hole for the rotating member to pass through at the center, each guide arm is provided with a guide drive groove and an L-shaped sliding rod movably provided, the longitudinal arm end of the sliding rod is movably engaged with the guide drive groove, and the transverse arm end of the sliding rod extends into the avoidance hole; a third spring is provided between the transverse arm end of the sliding rod and the first gear;

[0016] A pressing platform for applying downward pressure to the cross arm end of each slide rod is protruded from the outer wall of the rotating member below the clamping platform.

[0017] Optionally, the longitudinal arm end of the slide rod is elastically and floatingly connected with a floating pin, and the floating pin is movably inserted into the guide drive groove; the guide drive groove includes a first vertical section, a first inclined section, a second vertical section and a second inclined section which are connected in sequence end to end; the first vertical section is arranged close to the die;

[0018] A first limiting groove is provided at the upper end of the first vertical section, a second limiting groove is provided at one end of the first inclined section close to the first vertical section, a third limiting groove is provided at the lower end of the second vertical section, and a fourth limiting groove is provided at one end of the second inclined section close to the second vertical section; the floating pin is initially located in the first limiting groove.

[0019] Optionally, the pressing platform is in an inverted cone-shaped structure, and the end of the cross arm of the sliding rod is provided with a conical surface structure for matching with the pressing platform.

[0020] Optionally, a push platform structure is provided at the end of the longitudinal arm of the sliding rod, and the push platform structure is matched with the outer wall of the connecting rod.

[0021] Optionally, guide holes are provided at four corner positions of the upper mold plate, and guide rods for cooperating with the guide holes are provided at four corner positions of the concave mold.

[0022] The beneficial effects of the present invention are as follows: the present invention sets a first spinning mechanism and a second spinning mechanism, thereby pre-spinning the blank workpiece through the first spinning mechanism and the second spinning mechanism respectively, thereby effectively reducing the stress on the blank workpiece during deep drawing, allowing the blank workpiece to be continuously drawn, and then completing the deep drawing of the workpiece in a set of molds at one time, thereby improving production efficiency, reducing production costs, and achieving high deep drawing accuracy.

[0023] The present invention combines the spinning and drawing processes to reduce the processing time and at the same time reduce the stress on the rough workpiece during the drawing process, so that the rough workpiece will not break due to excessive stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional schematic diagram of the present invention when the upper mold device and the lower mold device are not molded;

[0025] Figure 2 It is a schematic structural diagram of the present invention when the upper mold device and the lower mold device are not molded;

[0026] Figure 3 It is a cross-sectional schematic diagram of the present invention after the upper mold device and the lower mold device are molded together;

[0027] Figure 4 It is a partial structural schematic diagram of the lower mold device of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the first spinning mechanism of the present invention;

[0029] Figure 6 is a schematic structural diagram of a second spinning mechanism of the present invention;

[0030] Figure 7 It is a structural schematic diagram of the limiting mechanism of the present invention;

[0031] Figure 8 It is a cross-sectional schematic diagram of the limiting frame of the present invention;

[0032] Fig. 9 yes Figure 8 A local enlarged schematic diagram of the middle A;

[0033] Fig.10 It is a partial structural schematic diagram of the cooperation between the slide rod and the floating pin of the present invention;

[0034] Description of reference numerals: 11, upper template; 111, guide hole; 12, punch core; 21, lower die seat; 22, die; 221, guide rod; 23, screw; 231, clamping table; 232, pressing table; 241, rotating ring; 242, first roller; 251, connecting rod; 252, upper spinning slide arm; 253, lower spinning slide arm; 254, second roller; 255, second spring; 256, guide rail seat; 261, limit frame; 2611, guide arm; 2612, avoidance hole; 2621, first vertical section; 26 22. First inclined section; 2623. Second vertical section; 2624. Second inclined section; 2625. First limiting groove; 2626. Second limiting groove; 2627. Third limiting groove; 2628. Fourth limiting groove; 263. Sliding rod; 2631. Conical surface structure; 2632. Push table structure; 264. Third spring; 265. Floating pin; 271. First gear; 272. Second gear; 273. Transmission rod; 274. Third gear; 275. Fourth gear; 28. First spring; 29. ​​Nut. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the implementation scope of the present invention is not limited thereto.

[0036] like Figures 1 to 10 As shown, a high-precision spinning mold for automobile special-shaped parts described in this embodiment includes an upper mold device and a lower mold device fixedly installed below the upper mold device; the upper mold device includes an upper mold plate 11 and a male mold core 12 rotatably installed at the center of the upper mold plate 11;

[0037] The lower die device includes a lower die base 21, a die 22 of the lower die base 21 fixed on the lower die base 21, a rotating part coaxially rotating through the die 22, a first spinning mechanism arranged on the top of the die 22, a plurality of second spinning mechanisms circumferentially distributed on the die 22, and a limiting mechanism arranged on the outer periphery of the die 22 and used to limit the plurality of second spinning mechanisms; the die 22 is provided with a forming cavity capable of integrally processing and forming the blank workpiece, a transmission mechanism is provided between the rotating part and the first spinning mechanism, and the rotating part transmits the rotational torque to the first spinning mechanism through the transmission mechanism, and a first spring 28 is provided between the rotating part and the die 22, and the rotating part rotates relative to the die 22 when moving downward and can apply downward pressure to the limiting mechanism.

[0038] Specifically, when the high-precision spinning mold of this embodiment is actually used, the blank workpiece is placed on the die 22, and the upper template 11 drives the punch core 12 to move down to contact the blank workpiece under the action of the external press, so that the blank workpiece is clamped between the rotating member and the punch core 12. As the punch core 12 is further pressed down, the rotating member moves downward under the pressure of the punch core 12 and rotates synchronously relative to the die 22, and the first spring 28 is compressed. At this time, the rotating member drives the blank workpiece and the punch core 12 to rotate synchronously. During the rotation process, the rotating member drives the first spinning mechanism to rotate through the transmission mechanism, and the first spinning mechanism performs preliminary spinning forming on the blank workpiece;

[0039] The rough workpiece after preliminary spinning is put into the forming cavity of the die 22 under the pressure of the punch core 12. Figure 1 and 3 As shown, multiple second spinning mechanisms pre-spin the blank workpiece at the drawing position of the forming cavity, thereby relieving the stress on the blank workpiece during drawing. When the rotating member moves down to apply downward pressure to the limiting mechanism, the limiting mechanism releases the limit of each second spinning mechanism, so that the formed workpiece product can be demolded, until the blank workpiece is drawn into a workpiece product;

[0040] Then the punch core 12 moves upward, releasing the downward pressure on the rotating part, and the first spring 28 resets, pushing the rotating part to move upward and rotate in the opposite direction relative to the die 22. During the upward movement of the rotating part, the workpiece product formed in the molding cavity is simultaneously ejected from the molding cavity. After the rotating part releases the downward pressure on the limiting mechanism, the limiting mechanism resets to limit each second spinning mechanism to facilitate the next deep drawing of the blank workpiece.

[0041] In this embodiment, a first spinning mechanism and a second spinning mechanism are arranged, so that the blank workpiece is pre-spun by the first spinning mechanism and the second spinning mechanism respectively, thereby effectively reducing the stress on the blank workpiece during deep drawing, allowing the blank workpiece to be continuously drawn, and then completing the deep drawing of the workpiece in a set of molds at one time, thereby improving production efficiency, reducing production costs, and achieving high deep drawing accuracy.

[0042] This embodiment combines the spinning and drawing processes to reduce the processing time and at the same time reduce the stress on the rough workpiece during the drawing process, so that the rough workpiece will not break due to excessive stress.

[0043] like Figures 1 to 5As shown, the embodiment described in this embodiment is a high-precision spinning forming mold for automobile special-shaped parts. In some embodiments, the first spinning mechanism includes a rotating ring 241 rotatably mounted on the die 22 and a plurality of first rollers 242 circumferentially arranged on the top of the rotating ring 241, and the axis of the first roller 242 is inclined outward; the rotating part synchronously drives the rotating ring 241 to rotate in the opposite direction through the transmission mechanism.

[0044] Specifically, the rotating ring 241 is installed outside the opening position of the molding cavity. When the rotating part moves downward, the rotating part transmits the rotational torque to the rotating ring 241 through the transmission mechanism, so that the rotating ring 241 rotates in the opposite direction relative to the die 22. The rotating ring 241 drives each first roller 242 to rotate. Since the first roller 242 is inclined, the first roller 242 is used to perform preliminary spin forming on the blank workpiece before entering the molding cavity, thereby reducing the drawing stress on the blank workpiece when entering the molding cavity, which is beneficial to the molding of the blank workpiece.

[0045] like Figures 1 to 4 As shown, a high-precision spinning forming mold for automobile special-shaped parts described in this embodiment, in some embodiments, the rotating part is a screw 23, a clamping platform 231 is arranged on the top of the screw 23, a nut 29 is fixedly embedded at the bottom of the lower die base 21, and the nut 29 is threadedly sleeved with the screw 23; the transmission mechanism includes a first gear 271 and a second gear 272 rotatably mounted on the bottom of the lower die base 21, the first gear 271 is threadedly sleeved with the screw 23, the second gear 272 is meshed with the first gear 271, the second gear 272 is coaxially sleeved with a transmission rod 273, the end of the transmission rod 273 away from the second gear 272 is sleeved with a third gear 274, the third gear 274 is meshed with a fourth gear 275, and the fourth gear 275 is meshed with a rotating ring 241.

[0046] Specifically, the rough workpiece is supported on the clamping table 231. By setting the clamping table 231, the rough workpiece is clamped more reliably and the support for the rough workpiece is better; the diameter of the first gear 271 is larger than the diameter of the second gear 272, the diameter of the third gear 274 is equal to the diameter of the fourth gear 275, and the diameter of the second gear 272 is larger than the diameter of the third gear 274 and the diameter of the fourth gear 275. In this way, the speed-increasing structure is formed, so that the rotating ring 241 drives the first roller 242 to rotate rapidly, thereby Rapid spinning process; during the process of the screw 23 being pressed and moving downward, since the position of the nut 29 is fixed, the screw 23 rotates relative to the nut 29, and drives the first gear 271 to rotate, the first gear 271 drives the second gear 272 to rotate, the second gear 272 drives the transmission rod 273 to rotate, the transmission rod 273 drives the third gear 274 to rotate, the third gear 274 drives the fourth gear 275 to rotate, and the fourth gear 275 drives the rotating ring 241 to rotate, thereby performing preliminary spinning forming on the blank workpiece before the blank workpiece enters the forming cavity.

[0047] In the high-precision spinning mold for automobile special-shaped parts described in this embodiment, in some embodiments, four second spinning mechanisms are arranged on the die 22 in a cross shape.

[0048] like Figure 1 , Figure 3 , Figure 4 and Figure 6 As shown, a high-precision spinning forming mold for automobile special-shaped parts described in this embodiment, in some embodiments, each second spinning mechanism includes a connecting rod 251 slidably arranged on the outer periphery of the die 22, and the two ends of the connecting rod 251 are connected with an upper spinning slide arm 252 and a lower spinning slide arm 253, the upper spinning slide arm 252 and the lower spinning slide arm 253 are respectively slidably arranged in the die 22 corresponding to the stretching position of the die 22, the inner ends of the upper spinning slide arm 252 and the inner ends of the lower spinning slide arm 253 are both axially connected with a second roller 254, the axis of the second roller 254 is parallel to the axis of the die 22, and the upper spinning slide arm 252 and the lower spinning slide arm 253 are respectively connected to the outer wall of the die 22 with a second spring 255; the upper spinning slide arm 252 and the lower spinning slide arm 253 overcome the elastic force of the second spring 255 under the action of the limiting mechanism to drive the second roller 254 to extend into the forming cavity of the die 22.

[0049] Specifically, when the blank workpiece after preliminary spinning enters the molding cavity, the upper spinning slide arm 252 and the lower spinning slide arm 253 overcome the elastic force of the second spring 255 under the action of the limiting mechanism to drive the second roller 254 to extend into the molding cavity of the die 22. Figure 1 As shown, the second roller 254 on the upper spinning slide arm 252 spins the blank workpiece, so as to pre-spin the blank workpiece when it is further drawn, so as to reduce the stress on the blank workpiece during the drawing. Similarly, when the blank workpiece moves down to contact the second roller 254 on the lower rotating arm, the second roller 254 on the lower rotating arm pre-spins the blank workpiece; in this way, the blank workpiece is pre-spun each time the blank workpiece is drawn and formed, so as to effectively reduce the stress on the blank workpiece during the drawing process, so that the blank workpiece will not be broken due to excessive stress.

[0050] After the screw rod 23 applies downward pressure to the limiting mechanism, the limiting mechanism releases the limit on the connecting rod 251. At this time, the upper spinning slide arm 252 and the lower spinning slide arm 253 slide outwards respectively under the elastic force of the second spring 255. The connecting rod 251 causes the upper spinning slide arm 252 and the lower spinning slide arm 253 to slide synchronously, thereby driving the second roller 254 to move out of the molding cavity.

[0051] After the blank workpiece is deep-drawn into the workpiece product, the punch core 12 is reset, and the screw 23 moves upward under the action of the first spring 28 to push the workpiece product out of the molding cavity. At this time, the screw 23 releases the pressure on the limiting mechanism, and the limiting mechanism is reset, thereby squeezing the connecting rod 251 to slide, and the connecting rod 251 simultaneously drives the upper spinning slide arm 252 and the lower spinning slide arm 253 to slide toward the molding cavity, so that the second roller 254 is extended into the molding cavity again for the next deep drawing of the blank workpiece.

[0052] like Figure 1 , Figure 3 and Figure 6 As shown, in the embodiment of the high-precision spinning mold for automobile special-shaped parts, in some embodiments, the second spinning mechanism further includes a guide rail seat 256, which is fixedly installed between the lower die seat 21 and the outer wall of the concave die 22, and a slide groove is provided in the guide rail seat 256, and the upper end of the connecting rod 251 is slidably connected in the slide groove. In this embodiment, the guide rail seat 256 is provided with a slide groove in the guide rail seat 256, so as to provide a guide limit for the connecting rod 251, so that the connecting rod 251 can reliably drive the upper spinning slide arm 252 and the lower spinning slide arm 253 to slide.

[0053] like Figure 1 , Figure 3 , Figure 4 and Figures 7 to 10 As shown, in the embodiment of the present invention, a high-precision spinning mold for automobile special-shaped parts is provided. In some embodiments, the limiting mechanism includes a limiting frame 261 fixedly installed at the bottom of the die 22, and the limiting frame 261 is provided with an L-shaped guide arm 2611 corresponding to each second spinning mechanism. The center of the limiting frame 261 is provided with an avoidance hole 2612 for the rotating part to pass through, and each guide arm 2611 is provided with a guide drive groove and an L-shaped slide bar 263 movably provided therein, and the longitudinal arm end of the slide bar 263 is movably engaged with the guide drive groove, and the transverse arm end of the slide bar 263 extends into the avoidance hole 2612; a third spring 264 for providing a reset elastic force for the slide bar 263 is provided between the transverse arm end of the slide bar 263 and the first gear 271;

[0054] The outer wall of the rotating part is protrudingly provided with a pressing platform 232 below the clamping platform 231 for applying downward pressure to the transverse arm end of each sliding rod 263; the longitudinal arm end of the sliding rod 263 is initially movably abutted against the lower end of the connecting rod 251, so that the upper spinning sliding arm 252 and the lower spinning sliding arm 253 respectively drive the second roller 254 to extend into the molding cavity of the die 22.

[0055] Specifically, Figure 1As shown, under the active engagement of the longitudinal arm end of the guide driving groove and the slide bar 263 and the elastic force of the third spring 264, the longitudinal arm end of the slide bar 263 is initially in active contact with the lower end of the connecting rod 251, so that the connecting rod 251 drives the upper spinning slide arm 252 and the lower spinning slide arm 253 to slide toward the forming cavity, so that the upper spinning slide arm 252 and the lower spinning slide arm 253 respectively drive the second roller 254 to move to the vicinity of the upper part of the drawing position of the forming cavity, so that when the blank workpiece rotates and moves downward, each second roller 254 spins the blank workpiece to reduce the stress on the blank workpiece during drawing, so that the blank workpiece will not be broken due to excessive stress.

[0056] When the pressing platform 232 moves down to contact the cross arm end of each slide bar 263, the pressing platform 232 applies downward pressure to the cross arm end of each slide bar 263, and each slide bar 263 overcomes the elastic force of the third spring 264 and slides downward. At this time, the longitudinal arm end of the slide bar 263 is disengaged from the lower end of the connecting rod 251, and each upper spinning slide arm 252 and lower spinning slide arm 253 slide outwards respectively under the elastic force of the second spring 255, so that the second roller 254 moves out of the molding cavity until the rotating member moves down to the lower dead center position. Figure 3 As shown, at this time, the deep drawing of the blank workpiece is completed;

[0057] When the punch core 12 releases the downward pressure on the rotating part, the first spring 28 is reset, pushing the rotating part upward, and the rotating part drives the deep-drawn workpiece product to move upward out of the molding cavity. The third spring 264 pushes each slide bar 263 to move upward. With the cooperation of the guide drive groove, the longitudinal arm end of each slide bar 263 abuts against the corresponding connecting rod 251 respectively, and applies thrust to the connecting rod 251, so that the connecting rod 251 drives the upper spinning slide arm 252 and the lower spinning slide arm 253 to slide toward the molding cavity, thereby resetting each second roller 254 to near the upper side of the corresponding drawing position of the molding cavity, waiting for the deep drawing of the next blank workpiece.

[0058] In this embodiment, an L-shaped slide bar 263 is movably engaged with the guide drive groove, and the longitudinal arm end of the slide bar 263 can be movably abutted against the connecting rod 251, so that the pressure of the rotating part is used to move the second roller 254 out of the forming cavity to facilitate demolding of the deep-drawn workpiece product. At the same time, after demolding, the elastic force of the third spring 264 is used to make each slide bar 263 push each connecting rod 251 to reset, thereby realizing one-time deep drawing of the rough workpiece into a workpiece product, thereby improving production efficiency.

[0059] like Figures 7 to 10As shown, a high-precision spinning forming mold for automobile special-shaped parts described in this embodiment, in some embodiments, the longitudinal arm end of the slide bar 263 is elastically connected with a floating pin 265, and the floating pin 265 is movably inserted into the guide driving groove; the guide driving groove includes a first vertical section 2621, a first inclined section 2622, a second vertical section 2623 and a second inclined section 2624 connected in sequence end to end; the first vertical section 2621 is arranged close to the die 22; the upper end of the first vertical section 2621 is provided with a first limiting groove 2625 to prevent the floating pin 265 from entering the second inclined section 2624 from the first vertical section 2621, and the first inclined section 2624 is provided with a first limiting groove 2625 to prevent the floating pin 265 from entering the second inclined section 2624 from the first vertical section 2621. The end of segment 2622 close to the first vertical segment 2621 is provided with a second limiting groove 2626 for preventing the floating pin 265 from entering the first vertical segment 2621 from the first inclined segment 2622, the lower end of the second vertical segment 2623 is provided with a third limiting groove 2627 for preventing the floating pin 265 from entering the first inclined segment 2622 from the second vertical segment 2623, and the end of the second inclined segment 2624 close to the second vertical segment 2623 is provided with a fourth limiting groove 2628 for preventing the floating pin 265 from entering the second vertical segment 2623 from the second inclined segment 2624; the floating pin 265 is initially located in the first limiting groove 2625.

[0060] When the pressing table 232 drives each slide bar 263 to slide downward, the slide bar 263 drives the floating pin 265 to smoothly transition from the first limiting groove 2625 to the first vertical section 2621, and moves downward along the trajectory of the first vertical section 2621. Since the upper spinning slide arm 252 and the lower spinning slide arm 253 can only slide horizontally, the slide bar 263 is disengaged from the abutment with the connecting rod 251. As the slide bar 263 continues to slide downward, the floating pin 265 enters the second limiting groove 2626 from the first vertical section 2621, and enters the first inclined section 2622 from the second limiting groove 2626, until it enters the third limiting groove 2627 from the first inclined section 2622, at which time the rotating member reaches the lower dead center position;

[0061] After the pressing platform 232 releases the downward pressure, the third spring 264 is reset, pushing each slide bar 263 to slide upward, and the floating pin 265 enters the second vertical section 2623 from the third limiting groove 2627. The floating pin 265 moves along the second vertical section 2623 and enters the fourth limiting groove 2628 from the second vertical section 2623, and then enters the second inclined section 2624 from the fourth limiting groove 2628, until it enters the first limiting groove 2625 from the second inclined section 2624. At this time, the slide bar 263 is reset. During the movement of the floating pin 265 along the second inclined section 2624, the longitudinal arm ends of each slide bar 263 respectively abut against the corresponding connecting rod 251 and apply thrust to the connecting rod 251, so that the connecting rod 251 drives the upper spinning slide arm 252 and the lower spinning slide arm 253 to slide toward the forming cavity, thereby resetting each second roller 254 to near the upper side of the corresponding drawing position of the forming cavity, waiting for the drawing and forming of the next blank workpiece.

[0062] like Figure 1 , Figure 3 and Figure 7 As shown, in the embodiment of the high-precision spinning mold for automobile special-shaped parts, in some embodiments, the press table 232 is an inverted cone structure, and the cross arm end of the slide bar 263 is provided with a conical surface structure 2631 for matching with the press table 232. Through the above arrangement, the press table 232 and the cross arm end of each slide bar 263 can cooperate more reliably, so that when the floating pin 265 enters the second limiting groove 2626, as the press table 232 is pressed down, the press table 232 generates a horizontal thrust on the slide bar 263, so that the slide bar 263 generates a horizontal displacement, so that the floating pin 265 can reliably enter the third limiting groove 2627 along the first inclined section 2622.

[0063] like Figure 1 , Figure 3 , Figure 7 and Fig.10 As shown, in the embodiment of the high-precision spinning mold for automobile special-shaped parts, in some embodiments, the longitudinal arm end of the slide bar 263 is provided with a push-table structure 2632, and the push-table structure 2632 is adapted to the outer wall of the connecting rod 251. In this embodiment, the push-table structure 2632 is provided so that the slide bar 263 can reliably push the connecting rod 251 to slide, thereby realizing the reset of the second roller 254.

[0064] In the high-precision spinning mold for automobile special-shaped parts described in this embodiment, in some embodiments, both sides of the longitudinal arm end of the slide bar 263 are elastically and floatingly connected with floating pins 265, and both inner side walls of each guide arm 2611 are correspondingly provided with guide drive grooves. Specifically, both sides of the longitudinal arm end of the slide bar 263 are provided with sliding holes, and the fourth spring is provided in the sliding hole, and the floating pin 265 is slidably embedded in the sliding hole and abuts against the fourth spring. Through the above-mentioned arrangement, the slide bar 263 in this embodiment moves more stably under the guiding limit of the guide drive groove, and the structural reliability is higher.

[0065] like Figures 1 to 4 As shown, in the embodiment of the present invention, a high-precision spinning mold for automobile special-shaped parts is provided. In some embodiments, the upper mold plate 11 is provided with guide holes 111 at four corners, and the concave mold 22 is provided with guide rods 221 for cooperating with the guide holes 111 at four corners. In the present embodiment, the guide holes 111 and the guide rods 221 are provided to cooperate with each other, thereby providing guidance and position limiting for the upper mold plate 11, so that the male mold core 12 can be reliably molded with the concave mold 22, which is conducive to improving the drawing precision.

[0066] The above is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the protection scope of the patent application of the present invention.

Claims

1. A high-precision spinning mold for automobile special-shaped parts, characterized in that: It includes an upper mold device and a lower mold device; the upper mold device includes an upper mold plate and a male mold core rotatably arranged at the center of the upper mold plate; The lower die device comprises a lower die seat, a die set on the lower die seat, a rotating member coaxially rotating and penetrating the die, a first spinning mechanism set on the top of the die, a plurality of second spinning mechanisms circumferentially distributed on the die, and a limiting mechanism set on the periphery of the die and used to limit the plurality of second spinning mechanisms; a transmission mechanism is provided between the rotating member and the first spinning mechanism, a first spring is provided between the rotating member and the die, and the rotating member rotates relative to the die when moving downward and can apply downward pressure to the limiting mechanism; The first spinning mechanism includes a rotating ring rotatably arranged on the concave mold and a plurality of first rollers circumferentially arranged on the top of the rotating ring, and the axes of the first rollers are arranged to be inclined outwards; The rotating member synchronously drives the rotating ring to rotate in the opposite direction through the transmission mechanism; The rotating part is a screw rod, a clamping platform is arranged on the top of the screw rod, a nut is fixedly embedded on the bottom of the lower die seat, and the nut is threadedly sleeved with the screw rod; The transmission mechanism includes a first gear and a second gear rotatably arranged at the bottom of the lower die seat, the first gear is threadedly sleeved with the screw rod, the second gear is meshed with the first gear, the second gear is coaxially sleeved with a transmission rod, the end of the transmission rod away from the second gear is sleeved with a third gear, the third gear is meshed with a fourth gear, and the fourth gear is meshed with a rotating ring; The second spinning mechanism includes a connecting rod slidably arranged on the outer periphery of the die, an upper spinning slide arm and a lower spinning slide arm are connected to both ends of the connecting rod, the upper spinning slide arm and the lower spinning slide arm are respectively slidably arranged in the die corresponding to the stretching position of the die, the inner ends of the upper spinning slide arm and the inner ends of the lower spinning slide arm are both axially connected to a second roller, the axis of the second roller is parallel to the axis of the die, and a second spring is respectively connected between the upper spinning slide arm and the lower spinning slide arm and the outer wall of the die; The upper spinning slide arm and the lower spinning slide arm overcome the elastic force of the second spring under the action of the limiting mechanism to drive the second roller to extend into the forming cavity of the concave mold.

2. The high-precision spinning mold for automobile special-shaped parts according to claim 1, characterized in that: The second spinning mechanism also includes a guide rail seat, in which a slide groove is arranged, and the upper end of the connecting rod is slidably connected in the slide groove.

3. The high-precision spinning mold for automobile special-shaped parts according to claim 1, characterized in that: The limiting mechanism includes a limiting frame arranged at the bottom of the die, the limiting frame is provided with an L-shaped guide arm corresponding to each second spinning mechanism, the center of the limiting frame is provided with an avoidance hole for the rotating member to pass through, each guide arm is provided with a guide drive groove and an L-shaped slide bar movably provided, the longitudinal arm end of the slide bar is movably engaged with the guide drive groove, and the transverse arm end of the slide bar extends into the avoidance hole; a third spring is provided between the transverse arm end of the slide bar and the first gear; A pressing platform for applying downward pressure to the cross arm end of each slide rod is protruded from the outer wall of the rotating member below the clamping platform.

4. The high-precision spinning mold for automobile special-shaped parts according to claim 3, characterized in that: The longitudinal arm end of the slide rod is elastically and floatingly connected with a floating pin, and the floating pin is movably inserted into the guide driving groove; the guide driving groove includes a first vertical section, a first inclined section, a second vertical section and a second inclined section which are connected in sequence end to end; the first vertical section is arranged close to the concave die; A first limiting groove is provided at the upper end of the first vertical section, a second limiting groove is provided at one end of the first inclined section close to the first vertical section, a third limiting groove is provided at the lower end of the second vertical section, and a fourth limiting groove is provided at one end of the second inclined section close to the second vertical section; the floating pin is initially located in the first limiting groove.

5. The high-precision spinning mold for automobile special-shaped parts according to claim 3, characterized in that: The pressing platform is an inverted cone-shaped structure, and the end of the horizontal arm of the sliding rod is provided with a conical surface structure for matching with the pressing platform.

6. The high-precision spinning mold for automobile special-shaped parts according to claim 3, characterized in that: A push platform structure is provided at the end of the longitudinal arm of the slide rod, and the push platform structure is matched with the outer wall of the connecting rod.

7. The high-precision spinning mold for automobile special-shaped parts according to claim 1, characterized in that: The four corner positions of the upper mold plate are provided with guide holes, and the four corner positions of the concave mold are provided with guide rods for matching with the guide holes.

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