Punching device and punching method for high-precision hydraulic torque converter cover plate

Abstract

The invention discloses a punching device and method for a high-precision hydraulic torque converter cover plate, and the punching device comprises a lower die assembly which comprises a lower die barrel, a buffer barrel, a sealing plate and a telescopic unit, the barrel bottom of the lower die barrel is provided with a positioning part and a supporting part, the supporting part is provided with a through hole, and the buffer barrel is provided with a communicating hole; the upper die assembly comprises an upper pressing pipe, a punching rod and a punching unit, and the outer diameter of the punching rod is smaller than or equal to the inner diameter of the corresponding through hole. According to the punching device and method for the high-precision hydraulic torque converter cover plate, after a blank is supported, positioned, locked and fixed, the telescopic unit drives the sealing plate to move upwards, so that after the amount of fine sand in the lower die barrel is increased, the contact area between the fine sand and the lower surface of the blank is increased, and therefore stable supporting of the fine sand is achieved; the deformation of the blank during punching is reduced, and the punching precision is improved, so that the product quality is favorably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile parts production, and particularly relates to a high-precision punching device and punching method for a torque converter cover plate. BACKGROUND

[0002] The core function of the punching die is to punch a through hole of a preset shape on a plate, profile or other blank. When in use, the blank is sent into the punch and the die and is positioned, then the punch is driven downward by the press to extrude the blank to cause plastic deformation or fracture, so that the blank is punched out of the hole, and the waste is discharged through the channel on the die to complete a single punching.

[0003] The punching die is widely used in metal processing, and is commonly used in the production of automobile parts, electronic components, hardware products and household appliance housings. However, compared with the plate with a single structure shape, the automobile parts are mostly of complex structure shape, so that when the blank for producing the automobile parts is punched, the lower surface of the blank cannot be uniformly and stably supported like the flat plate, and thus when the punching pressure is too large or the punching position is close to the edge of the material, the punching part is deformed, and thus a certain deviation is caused between the actual shape of the punched product and the target shape, the punching precision is reduced, and thus the quality of the final product is reduced.

[0004] Therefore, it is necessary to improve the punching die for the automobile parts, especially the torque converter cover plate in the prior art. SUMMARY

[0005] The present application aims to overcome the defects in the prior art, and provides a high-precision punching device and punching method for a torque converter cover plate.

[0006] In order to solve the above technical problems, the present application provides a high-precision punching device for a torque converter cover plate, comprising: A lower die assembly comprises a horizontal and top-open lower die barrel, a buffer cylinder fixed through the lower die barrel, a sealing plate in sealing connection with the circumferential inner wall of the buffer cylinder, and an extension unit for driving the sealing plate to move axially along the buffer cylinder. The barrel bottom of the lower die barrel is provided with a positioning member for radially positioning the blank and a support member for supporting the position to be punched of the blank. The support member is provided with a through hole extending in the vertical direction. The buffer cylinder is provided with a communication hole located above the barrel bottom of the lower die barrel. The buffer cylinder and the lower die barrel are used to fill fine sand to support the lower surface of the blank placed on the support member and the positioning member. An upper die assembly includes an upper pressing pipe coaxially arranged above the through hole, a punch coaxially arranged in the upper pressing pipe, and a stamping unit for driving the upper pressing pipe and the punch to press the blank and punch the blank through the punch.

[0007] Preferably, to prevent the fine sand from overflowing the lower die barrel, the upper die assembly further includes an upper die cover located above the lower die barrel and downwardly, and a lifting unit for driving the upper die cover to move along the vertical direction, the upper die cover has a sealing station and a taking and placing station at two ends of the movable path, respectively, at the sealing station, the upper die cover and the lower die barrel form a sealing cavity, and at the taking and placing station, a gap is provided between the upper die cover and the lower die barrel for taking and placing the blank.

[0008] Preferably, to strengthen the support of the fine sand on the blank and reduce the amount of fine sand used, the upper die cover and / or the lower die barrel is provided with an air inflation pipe connected to a high-pressure air source, and the air inflation pipe is provided with an air valve.

[0009] Preferably, to ensure that the fine sand can fully contact the lower surface of the blank, the lower die barrel and / or the upper die cover is provided with an observation port connected to an observation window.

[0010] Preferably, to ensure that the fine sand can first fix the position of the blank before supporting the blank and prevent the fine sand from entering the through hole, the stamping unit includes an axially vertical stamping oil cylinder, the cylinder barrel of the stamping oil cylinder is fixed to the upper die cover, the bottom end of the piston rod is fixedly connected with the punch, and the upper pressing pipe is connected with the punch through a compression spring.

[0011] Preferably, to realize the synchronous movement of the upper pressing pipes and reduce the amount of fine sand used, the upper pressing pipes are fixedly connected through a horizontal upper pressing ring, the outer diameter of the buffer cylinder is consistent with the inner diameter of the blank, and the upper pressing ring is coaxial with the buffer cylinder.

[0012] Preferably, to facilitate the discharge of waste, the device further includes: A collecting assembly includes a guide barrel located below the through hole and having an open top facing the through hole, and a collecting barrel located below the guide barrel and having an open top, the bottom of the guide barrel is provided with a discharge pipe, and the collecting barrel is opposite to the pipe opening at the bottom of the discharge pipe.

[0013] Preferably, to facilitate the separation of fine sand and waste, the collecting barrel includes an upper barrel and a lower barrel which are sequentially inserted and fitted in the vertical direction and have open tops, the barrel bottom of the upper barrel is provided with a recycling through hole, the recycling through hole is located above the lower barrel, the hole diameter of the recycling through hole is greater than the particle size of the fine sand and less than the outer diameter of the punch.

[0014] To solve the above technical problems, the application further provides a punching method for a high-precision hydraulic torque converter cover plate, comprising the following steps: S10, preparation: placing a blank to be punched in a lower die barrel, the barrel bottom of the lower die barrel is provided with a positioning member for positioning the blank in the radial direction and a support member for supporting the position of the blank to be punched, the support member is provided with a through hole extending in the vertical direction, the blank is positioned in the radial direction and supported horizontally through the cooperation of the positioning member and the lower die barrel, the through hole is aligned with the position of the blank to be punched, the barrel bottom of the lower die barrel is further fixed with a buffer cylinder, the buffer cylinder is provided with a communication hole located above the barrel bottom of the lower die barrel, the circumferential inner wall of the buffer cylinder is sealingly connected with a sealing plate, the sealing plate is connected with a telescopic unit for driving the sealing plate to move circumferentially along the buffer cylinder, and the buffer cylinder and the lower die barrel are ensured to have a certain amount of fine sand; S20, pressing: the pressing unit controls the upper pressing pipe corresponding to the through hole to descend, so that the bottom surface of the upper pressing pipe abuts against the top surface of the position of the blank to be punched, so as to fix the position of the blank; S30, reinforcing support: the telescopic unit controls the sealing plate to move upwards, so that part of the fine sand in the buffer cylinder enters the lower die barrel through the communication hole, the amount of fine sand in the lower die barrel is increased, and the fine sand contacts the bottom surface of the blank to assist in supporting the blank; S40, punching: the telescopic unit controls the punch rod in the upper pressing pipe to descend, and the blank is punched, so that the waste after punching is discharged downward from the lower die barrel through the pipe through hole; S50, sand discharge: the telescopic unit controls the sealing plate to move upwards, so that part of the fine sand in the lower die barrel enters the buffer cylinder through the communication hole, the amount of fine sand in the lower die barrel is reduced, and the amount of fine sand contacting the bottom surface of the blank is reduced; S60, material taking: the telescopic unit controls the punch rod and the upper pressing pipe to move upwards to be above the blank after punching is completed.

[0015] Preferably, in order to reduce the amount of fine sand used and strengthen the support of the blank, the step S20 and the step S30 further comprise the step S21, sealing and pressurizing: the lifting unit controls the upper die cover to descend to the sealing station, so that the upper die cover and the lower die barrel form a sealed cavity, high-pressure gas is introduced into the sealed cavity, and the gas pressure in the sealed cavity is greater than the external air pressure.

[0016] As described above, compared with the prior art, the punching device and method for the high-precision hydraulic torque converter cover plate of the application can realize stable support of the fine sand by supporting and positioning the blank, locking and fixing the blank, moving the sealing plate upwards by the telescopic unit, increasing the amount of fine sand in the lower die barrel, and increasing the contact area between the fine sand and the lower surface of the blank, thereby reducing the deformation of the blank during punching, improving the punching precision, and improving the product quality. Attached Figure Description

[0017] Figure 1 (a) is a schematic diagram of the structure of the cover plate blank of the prior art hydraulic torque converter before punching; Figure 1 (b) is a top view of the cover plate blank of a prior art hydraulic torque converter before punching; Figure 1 (c) is a schematic diagram of the structure of the cover plate blank of the prior art hydraulic torque converter after punching; Figure 1 (d) is a top view of the existing hydraulic torque converter cover plate blank after punching; Figure 2 This is a schematic diagram of the structure of the first embodiment; Figure 3 This is a structural schematic diagram of another usage state of the first embodiment; Figure 4 yes Figure 3 Cross-sectional structural diagram; Figure 5 yes Figure 4 Enlarged view of part A; Figure 6 yes Figure 3 A cross-sectional view of the structure from another perspective; Figure 7 yes Figure 6 Enlarged view of part B; Figure 8 This is a schematic diagram of the upper mold assembly in the first embodiment; Figure 9 yes Figure 8 An explosion diagram; Figure 10 This is a schematic diagram of the structure of the lower mold assembly and the material collection assembly in the first embodiment; Figure 11 yes Figure 10 An explosion diagram; Figure 12 This is a schematic diagram of the connection structure between the mold barrel and the buffer barrel in the first embodiment; Figure 13 This is a schematic diagram of the upper bucket structure in the first embodiment; Figure 14 This is a structural schematic diagram of the second embodiment; In the figure: 1, lower mold assembly; 11, lower mold barrel; 111, positioning piece; 112, support piece; 1121, through hole; 113, observation window; 114, lower flange; 115, sealing ring; 12, buffer cylinder; 121, communication hole; 122, guide sleeve; 13, telescopic unit; 131, motor; 132, screw rod; 133, screw sleeve; 14, sealing plate; 141, sealing sleeve; 2, upper mold assembly; 21, upper pressing pipe; 211, upper pressing ring; 212, side plate; 22, punch rod; 23, stamping unit; 231, stamping oil cylinder; 232, compression spring; 233, stamping plate; 234, sliding rod; 235, limiting plate; 24, upper mold cover; 241, upper flange; 25, lifting unit; 251, lifting oil cylinder; 252, top plate; 253, upper support; 254, sliding sleeve; 26, inflation pipe; 261, air valve; 27, air pressure gauge; 3, material collecting assembly; 31, material guide barrel; 311, material discharge pipe; 312, lower support; 32, upper barrel; 321, recycling through hole; 33, lower barrel; 4, blank; 41, center ring; 411, connecting through hole; 412, pressure relief through hole; 42, positioning lug; 43, transition part; 44, flange part; 45, assembly part; 451, assembly through hole; 46, notch; 5, base. DETAILED DESCRIPTION

[0018] The specific embodiments of the present application will be further described below in conjunction with the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.

[0019] As Figure 1 shown, it is a schematic diagram of the hydraulic torque converter cover plate before and after processing in the prior art, specifically, Figure 1 (a) and Figure 1 (b) are respectively a structural schematic diagram and a top view of the blank 4 before punching, Figure 1 (c) and Figure 1 (d) are respectively a structural schematic diagram and a top view of the blank 4 after punching. Further specifically, the blank 4 includes the center ring 41, the transition part 43 and the flange part 44 which are fixedly connected in sequence along the same axis, the annular surface of the center ring 41 is perpendicular to the axis, the transition part 43 is a first annular groove, the groove opening of the first annular groove is basically consistent with the axis, and the inner wall and the outer wall of the first annular groove are both circular arc in cross section, the flange part 44 is a second annular groove, the groove opening of the second annular groove is toward the axis, the blank 4 is provided with three notches 46 which are arranged in an annular array and extend along the radial direction of the blank 4, the notch 46 extends from the side where the transition part 43 is connected with the center ring 41 to the side where the flange part 44 is away from the transition part 43, the circumferential outer edge of the center ring 41 is integrally connected with the positioning lug 42 which is in the same plane and corresponds to the three notches 46 one by one, and the flange part 44 is provided with the three assembly parts 45 which correspond to the three notches 46 one by one.

[0020] The punching device and the punching method of the present application are used for punching on the blank 4 to form the connecting through holes 411, the pressure relief through holes 412 and the assembly through holes 451 distributed in an annular array, the connecting through holes 411 and the pressure relief through holes 412 are formed on the center ring 41, and the assembly through holes 451 are formed on the assembly part 45, wherein the assembly through holes 451 undertake the external receiving function to fix and connect the torque converter cover plate and the external structure such as the transmission shell, the connecting through holes 411 are used for positioning or connecting with the internal core components such as the pump wheel and the guide wheel to ensure the coaxiality and structural stability of the internal elements, and the pressure relief through holes 412 are used for controlling the oil flow rate and pressure to assist in realizing the high-speed torque conversion, lock-up switching and other functions of the torque converter.

[0021] First embodiment

[0022] As shown in Figures 2-13 the first embodiment of the present application, a punching device for a high-precision torque converter cover plate comprises: a lower die assembly 1 comprising a horizontal and top-open lower die barrel 11, a buffer cylinder 12 fixedly penetrating the lower die barrel 11, a sealing plate 14 sealingly connected with the circumferential inner wall of the buffer cylinder 12, and an extension unit 13 driving the sealing plate 14 to move axially along the buffer cylinder 12, the barrel bottom of the lower die barrel 11 is provided with a positioning piece 111 for radially positioning the blank 4 and a supporting piece 112 for supporting the position to be punched of the blank 4, the supporting piece 112 is provided with a through hole 1121 extending in the vertical direction, the buffer cylinder 12 is provided with a communication hole 121 located above the barrel bottom of the lower die barrel 11, and the buffer cylinder 12 and the lower die barrel 11 are used to fill fine sand to support the lower surface of the blank 4 placed on the supporting piece 112 and the positioning piece 111; an upper die assembly 2 comprising an upper pressing pipe 21 coaxially arranged above the through hole 1121 one by one, a punch rod 22 sealingly and tightly fitted with the circumferential inner wall of the upper pressing pipe 21, and a punching unit 23 driving the upper pressing pipe 21 and the punch rod 22 to lift and lower to press the upper pressing pipe 21 tightly on the top surface of the position to be punched of the blank 4, and then punch the blank 4 through the punch rod 22, the outer diameter of the punch rod 22 is less than or equal to the inner diameter of the corresponding through hole 1121.

[0023] The device uses initially, through the stamping unit 23 control punch rod 22 and the upper pressure pipe 21 up, through the telescopic unit 13 control sealing plate 14 down, ensure that the cache cylinder 12 and the lower die barrel 11 inside a certain amount of fine sand, after the blank 4 to be punched processing is placed horizontally in the lower die barrel 11, the use of the lower die barrel 11 in the support 112 to support the blank 4, specifically, the top surface of the support 112 and the bottom surface of the center ring 41 of the blank 4 and the bottom surface of the blank 4 assembly part 45 fit, at the same time, the use of positioning member 111 to the radial positioning of the blank 4, because the center ring 41 of the blank 4 circumferential edge annular array distribution three positioning lugs 42, therefore, the positioning member 111 is provided with three, with three positioning lugs 42 one to one, and the top surface of the positioning member 111 is provided with a notch (such as Figure 11 The device uses initially, through the stamping unit 23 control punch rod 22 and the upper pressure pipe 21 up, through the telescopic unit 13 control sealing plate 14 down, ensure that the cache cylinder 12 and the lower die barrel 11 inside a certain amount of fine sand, after the blank 4 to be punched processing is placed horizontally in the lower die barrel 11, the use of the lower die barrel 11 in the support 112 to support the blank 4, specifically, the top surface of the support 112 and the bottom surface of the center ring 41 of the blank 4 and the bottom surface of the blank 4 assembly part 45 fit, at the same time, the use of positioning member 111 to the radial positioning of the blank 4, because the center ring 41 of the blank 4 circumferential edge annular array distribution three positioning lugs 42, therefore, the positioning member 111 is provided with three, with three positioning lugs 42 one to one, and the top surface of the positioning member 111 is provided with a notch (such as

[0024] In this embodiment, the support 112 is a tubular structure extending in the vertical direction, so that the lumen of the support 112 is automatically shaped into a through hole 1121 for the bottom end of the punch rod 22 to punch into during stamping. The supports 112 are provided with gaps for fine sand to pass through, facilitating the flow of fine sand between the lower die barrels 11.

[0025] After the blank 4 is placed, the stamping unit 23 operates to control the upper pressure pipe 21 to descend, so that the top surface of the upper pressure pipe 21 abuts against the top surface of the blank 4. Specifically, the bottom end of the upper pressure pipe 21 abuts against the top surface of the blank 4, the top surface of the center ring 41 of the blank 4, and the top surface of the assembly part 45, thereby locking and fixing the blank 4 on the supports 112 by the upper pressure pipe 21.

[0026] Then, the telescopic unit 13 controls the sealing plate 14 to move upwards, pushing the fine sand in the cache cylinder 12 into the lower die barrel 11 through the communication holes 121, thereby increasing the amount of fine sand in the lower die barrel 11. In this way, after the amount of fine sand in the lower die barrel 11 is increased, the fine sand can automatically adapt to the bottom surface of the blank 4 and abut against the bottom surface of the blank 4 due to its fluidity, thereby achieving reinforcement and support of the blank 4. Moreover, since the upper pressure pipe 21 and the supports 112 abut against the top surface and the bottom surface of the blank 4, respectively, the fine sand is prevented from flowing into the position to be punched of the blank 4.

[0027] Subsequently, the stamping unit 23 drives the punch rod 22 to descend, so that the punch rod 22 descends along the upper pressure pipe 21 to stamp the blank 4, forming a connecting through hole 411, a pressure relief through hole 412, and an assembly through hole 451 on the blank 4. The punch rod 22 punches into the through hole 1121, and the waste material on the blank 4 is discharged out of the lower die barrel 11 through the through hole 1121.

[0028] After the punching, the sealing plate 14 is lowered by the telescopic unit 13, so that part of the fine sand in the lower die barrel 11 enters the buffer cylinder 12 through the communication hole 121, reducing the amount of fine sand in the lower die barrel 11, thereby reducing the amount of fine sand in contact with the blank 4. After the amount of fine sand in contact with the blank 4 is reduced, the upper pressing pipe 21 and the punch rod 22 are raised by the stamping unit 23, and after being separated from the blank 4 and the lower die barrel 11, the completed punching blank 4 can be taken out, thereby completing the entire punching work of the blank 4.

[0029] Compared with the prior art, the punching device of the embodiment can lock and fix the blank 4 by matching the upper pressing pipe 21 and the support 112, which can avoid the position deviation of the blank 4 caused by the increase of the amount of fine sand in the lower die barrel 11, thereby affecting the punching precision in the later stage, and can also seal the punching position to prevent the fine sand from moving to the punching position and affecting the subsequent punching. After the blank 4 is locked and fixed, the amount of fine sand in the lower die barrel 11 is increased, and the fluidity of the fine sand is utilized to make the fine sand contact the lower surface of the blank 4 and form a solid-like supporting effect, thereby wrapping the blank 4 around the punching position and assisting the support of the blank 4. During the punching process of the punch rod 22, the pressure can be transmitted by the extrusion of the fine sand, the shear force caused by the punch rod 22 can be balanced, and the material can be prevented from collapsing, warping and other deformations caused by unilateral stress. Furthermore, since the punching position of the blank 4 is close to the inner wall of the center ring 41, and the assembly through hole 451 is close to the circumferential outer edge of the assembly part 45, that is, the connection through hole 411, the pressure relief through hole 412 and the assembly through hole 451 are all adjacent to the edge position of the blank 4, the fine sand can fill the gap at the edge position, supplement the supporting strength of the edge, reduce the asymmetry of the hole caused by the unconstrained edge, and further improve the punching precision, thereby improving the product quality.

[0030] Further improvement is that the upper die assembly 2 further comprises an upper die cover 24 located directly above the lower die barrel 11 and downward, and a lifting unit 25 driving the upper die cover 24 to move along the vertical direction. The two ends of the moving path of the upper die cover 24 are a sealing station and a taking and placing station, respectively. At the sealing station, the upper die cover 24 and the lower die barrel 11 form a sealing cavity. At the taking and placing station, a gap for taking and placing the blank 4 is provided between the upper die cover 24 and the lower die barrel 11 (as shown in Figures 3-5 ).

[0031] After the above design, the upper die cover 24 is lowered to the sealing station to form a sealing cavity with the lower die barrel 11 by the lifting unit 25, and then the sealing plate 14 is raised by the telescopic unit 13. When the amount of fine sand in the lower die barrel 11 is increased, the fine sand can effectively overflow the lower die barrel 11. After the punching is completed, the sealing plate 14 is first lowered by the telescopic unit 13 to reduce the amount of fine sand in the lower die barrel 11, so that the height of the fine sand is lower than the top barrel opening of the lower die barrel 11. When the upper die cover 24 is raised, the fine sand can overflow the lower die barrel 11.

[0032] Further improvement is that the upper die cover 24 and / or the lower die barrel 11 is provided with an inflation pipe 26, the inflation pipe 26 is used to connect a high-pressure gas source, and the inflation pipe 26 is provided with a gas valve 261.

[0033] Preferably, the inflation pipe 26 is fixedly connected to the upper die cover 24, and the gas valve 261 is preferably a one-way valve to limit the flow direction of the high-pressure gas, so that the high-pressure gas enters the upper die cover 24. After the above design is adopted, when the upper die cover 24 and the lower die barrel 11 form a sealed cavity, the high-pressure gas is introduced into the sealed cavity through the inflation pipe 26, the air pressure in the sealed cavity is increased, and the fine sand in the lower die barrel 11 and the buffer cylinder 12 is compacted by high pressure, reducing the voids between the fine sand. In this way, after the sealing plate 14 moves up, the compacted fine sand can provide more stable support to the blank 4 and increase the contact area with the blank 4, so that the compacted fine sand can better transmit the force during punching, further improving the punching precision. Moreover, after punching, when the sealing plate 14 descends, the high-pressure gas in the high-pressure environment in the sealed cavity can act on the fine sand, promoting the fine sand to enter the buffer cylinder 12 through the communication hole 121, facilitating the fine sand to quickly separate from the blank 4, thereby improving the processing efficiency.

[0034] Further improvement is that the stamping unit 23 includes an axially vertical stamping oil cylinder 231, the cylinder barrel of the stamping oil cylinder 231 is fixed to the upper die cover 24, the bottom end of the piston rod is fixedly connected with the punch rod 22 and connected with the upper pressing pipe 21 through the compression spring 232.

[0035] After the above design is adopted, before punching, the bottom end of the upper pressing pipe 21 is located below the bottom end of the punch rod 22, so that when the piston rod of the stamping oil cylinder 231 descends, the upper pressing pipe 21 can first abut against the top surface of the blank 4, and the elastic pressure of the compression spring 232 can make the upper pressing pipe 21 apply a locking force to the blank 4 to achieve locking and fixing of the blank 4. After the fine sand is added in the lower die barrel 11, the piston rod of the stamping oil cylinder 231 continues to descend, and the punch rod 22 acts on the blank 4 to achieve punching.

[0036] Further improvement is that the upper pressing pipes 21 are fixedly connected through horizontal upper pressing rings 211, the outer diameter of the buffer cylinder 12 is consistent with the inner diameter of the blank 4, and the upper pressing ring 211 is coaxial with the buffer cylinder 12.

[0037] Specifically, the upper pressing ring 211 is integrally formed between the bottom ends of the upper pressing pipe 21, and the circumferential outer edge of the upper pressing ring 211 is further integrally formed with three long strip-shaped side plates 212 corresponding to the three positioning members 111. Thus, after the upper die cover 24 and the lower die barrel 11 enclose a sealed cavity and before the amount of fine sand in the lower die barrel 11 is increased, the stamping oil cylinder 231 controls the upper pressing pipe 21 to descend and abut against the top surface of the blank 4. Then, the upper pressing ring 211 and the side plates 212 can first abut against the top surface of the blank 4. On the one hand, the contact area between the upper die assembly 2 and the top surface of the blank 4 is increased, thereby enhancing the locking and fixing effect. On the other hand, the upper pressing ring 211 and the side plates 212 can occupy part of the space on the top of the blank 4, thereby reducing the fine sand above the blank 4 after the amount of fine sand in the lower die barrel 11 is increased. More fine sand can be concentrated on the lower part of the blank 4, thereby enhancing the auxiliary support of the blank 4 and reducing the fine sand adhered to the blank 4 after the punching is completed.

[0038] Further improvement is that the punching device of the high-precision torque converter cover plate of the embodiment further comprises: The material collecting assembly 3 comprises a guide barrel 31 located directly below the through hole 1121 and having an open top facing the through hole 1121, and a collecting barrel located below the guide barrel 31 and having an open top. The bottom of the guide barrel 31 is provided with a discharge pipe 311, and the collecting barrel is opposite to the pipe opening at the bottom of the discharge pipe 311 (as shown in Figure 3 and Figure 4 ).

[0039] After the above design, the waste material formed by the punching of the punch rod 22 on the blank 4 can be collected by the guide barrel 31. The waste material falls downward into the guide barrel 31 through the through hole 1121. The barrel bottom of the guide barrel 31 is inclined downward toward the discharge pipe 311, so that the waste material can slide along the inclined barrel bottom of the guide barrel 31 and fall downward into the collecting barrel below through the discharge pipe 311.

[0040] Further improvement is that the collecting barrel comprises an upper barrel 32 and a lower barrel 33 which are sequentially inserted and matched in the vertical direction and have open tops. The barrel bottom of the upper barrel 32 is provided with a recycling through hole 321 which is located directly above the lower barrel 33. The diameter of the recycling through hole 321 is greater than the particle diameter of the fine sand and smaller than the outer diameter of the punch rod 22.

[0041] When the blank 4 is taken out, part of the fine sand on the blank 4 falls into the lower die barrel 11, and part of the fine sand enters the through hole 1121 and then enters the guide barrel 31 through the through hole 1121. The waste material formed by punching is discharged from the discharge pipe 311 and enters the upper barrel 32. Since the barrel bottom of the upper barrel 32 is provided with the recycling through hole 321, the waste material can be intercepted. The fine sand enters the lower barrel 33 through the recycling through hole 321, thereby realizing the recycling of the fine sand and avoiding the waste of the fine sand.

[0042] The punching device of the embodiment further comprises a horizontal base 5, which is fixedly arranged, as shown in Figure 6 、 Figure 10 and Figure 11 , the material guiding barrel 31 is annular and has the same outer diameter as the lower mold barrel 11, so as to ensure that the barrel opening thereof is opposite to the through hole 1121, and the bottom of the material guiding barrel 31 is fixed to the upper side of the base 5 by the lower support 312, and the material guiding barrel 31 is fixed to the lower side of the lower mold barrel 11.

[0043] As shown in Figure 4 and Figure 13 , the inner diameter of the upper barrel 32 is consistent with the outer diameter of the lower barrel 33, the barrel bottom of the upper barrel 32 is formed between the bottom end and the top end of the upper barrel 32, so that the bottom of the upper barrel 32 forms an insertion sleeve with the same inner diameter as the outer diameter of the lower barrel 33, facilitating the insertion and cooperation of the upper barrel 32 and the lower barrel 33, so as to detachably connect the two barrels and recycle waste and fine sand.

[0044] As shown in Figure 5 、 Figure 7 and Figure 11 , the lower mold barrel 11 is a circular barrel, the top of the lower mold barrel 11 is integrally formed with a downward flange 114, the bottom of the upper mold cover 24 is integrally formed with an upward flange 241, and the downward flange 114 is provided with a resilient sealing ring 115, which is a rubber ring, so that the sealing contact area is increased by the upward flange 241 and the downward flange 114, and the sealing type is strengthened by the sealing ring 115, so as to ensure the sealing connection between the upper mold cover 24 and the lower mold barrel 11 after the upper mold cover 24 is lowered to the sealing station.

[0045] As shown in Figure 4 、 Figure 11 and Figure 12 , the telescopic unit 13 comprises a motor 131, a screw rod 132 and a screw sleeve 133 arranged in sequence from top to bottom, the motor 131 is fixed to the upper side of the base 5 and has a coaxial fixed connection with the output end of the screw rod 132, the screw sleeve 133 is threadedly connected with the screw rod 132 and is fixed to the upper side of the sealing plate 14, the circumferential outer edge of the sealing plate 14 is sleeved with a resilient sealing sleeve 141, which is preferably a rubber sleeve, so as to ensure the sealing connection between the sealing plate 14 and the buffer cylinder 12; the bottom end of the buffer cylinder 12 is fixed with a guide sleeve 122, the circumferential outer edge of the screw sleeve 133 is sealingly fitted with the circumferential inner wall of the guide sleeve 122, and the screw sleeve 133 slides through the guide sleeve 122. When the motor 131 is started, the screw rod 132 is driven to rotate around its own axis, which acts on the screw sleeve 133, and through the sliding cooperation between the screw sleeve 133 and the guide sleeve 122, the stable lifting movement of the sealing plate 14 is realized.

[0046] The top of the buffer cylinder 12 is closed, and a plurality of communication holes 121 are arranged in an annular array on the circumferential outer edge of the buffer cylinder 12 to facilitate the flow of fine sand between the buffer cylinder 12 and the lower mold barrel 11. The outer diameter of the buffer cylinder 12 is consistent with the inner diameter of the center ring 41 of the blank 4, facilitating positioning of the blank 4 by the positioning member 111.

[0047] As shown in Figure 5 , Figures 7-9 In the upper mold assembly 2, the lifting unit 25 includes a lifting oil cylinder 251, a top plate 252, an upper leg 253, and a sliding sleeve 254. The two sides of the material guiding barrel 31 are provided with flat plates, the upper leg 253 is fixed above the flat plates, the top plate 252 is fixed to the top end of the upper leg 253, the lifting oil cylinder 251 is vertically arranged downward, the cylinder barrel of the lifting oil cylinder 251 is fixed above the top plate 252, the piston rod penetrates through the top plate 252 and is fixedly connected to the bottom of the upper mold cover 24, and the sliding sleeve 254 is fixed to the outside of the upper mold cover 24 and is slidably sleeved on the outside of the upper leg 253 in the vertical direction, so that when the lifting oil cylinder 251 operates, the upper mold cover 24 can stably move up and down along the vertical direction under the sliding cooperation of the sliding sleeve 254 and the upper leg 253.

[0048] The upper mold cover 24 is provided with a pressure gauge 27 for detecting the air pressure in the upper mold cover 24.

[0049] In the stamping unit 23, the cylinder barrel of the stamping oil cylinder 231 is fixed above the upper mold cover 24, the piston rod of the stamping oil cylinder 231 is fixedly connected with a horizontal stamping plate 233 downward in the vertical direction, the punch rod 22 is fixed below the stamping plate 233 in the vertical direction, the top surface of the upper pressing ring 211 is fixed with a sliding rod 234 extending upward in the vertical direction, the sliding rod 234 penetrates through the stamping plate 233 and is fixedly connected with a limiting plate 235 at the top end, and the compression spring 232 is sleeved outside the sliding rod 234, and the top end and the bottom end of the compression spring 232 are connected with the stamping plate 233 and the upper pressing ring 211, respectively.

[0050] After the above structure is adopted, when the stamping oil cylinder 231 drives the punch rod 22 to move downward, the upper pressing ring 211 and the bottom end of the upper pressing pipe 21 first contact the top surface of the blank 4. As the punch rod 22 continues to descend, the compression spring 232 is further compressed, increasing the locking pressure on the blank 4. After the punch rod 22 punches a hole in the blank 4, the punch rod 22 first separates from the blank 4 during the upward movement of the piston rod of the stamping oil cylinder 231. During this process, the compression spring 232 exerts pressure on the upper pressing ring 211 to prevent the blank 4 from moving upward with the punch rod 22. Then, the piston rod of the stamping oil cylinder 231 continues to move upward, driving the upper pressing pipe 21 to separate from the blank 4.

[0051] Second embodiment

[0052] As shown in Figure 14As shown, the punching device for the high-precision hydraulic torque converter cover plate of the second embodiment of the present application is based on the first embodiment, and the difference lies in that the lower die barrel 11 is provided with an observation port, and the observation port is connected with an observation window 113.

[0053] The observation window 113 is arranged on the side wall of the lower die barrel 11, and the observation window 113 is made of glass. After the above structure is adopted, the amount of fine sand in the lower die barrel 11 can be conveniently observed through the observation window 113, so as to ensure that the fine sand can fully contact the bottom surface of the blank 4 before punching, and the fine sand can be separated from the blank 4 after the punching is completed.

[0054] Of course, as an alternative of similar effect, the observation window 113 can also be arranged on the upper die cover 24.

[0055] Based on the punching device of the above two embodiments, the present application further provides a punching method for the high-precision hydraulic torque converter cover plate, which comprises the following steps: S10, preparation: the blank 4 to be punched is arranged in the lower die barrel 11, the barrel bottom of the lower die barrel 11 is provided with a positioning member 111 for radially positioning the blank 4 and a supporting member 112 for supporting the position to be punched of the blank 4, the supporting member 112 is provided with a through hole 1121 extending in the vertical direction, the blank 4 is radially positioned and horizontally supported by the cooperation of the positioning member 111 and the lower die barrel 11, the through hole 1121 is aligned with the position to be punched of the blank 4, and the barrel bottom of the lower die barrel 11 is further fixed with the buffer cylinder 12, the buffer cylinder 12 is provided with a communication hole 121 located above the barrel bottom of the lower die barrel 11, the circumferential inner wall of the buffer cylinder 12 is sealingly connected with the sealing plate 14, the sealing plate 14 is connected with the telescopic unit 13 for driving the sealing plate 14 to move along the circumferential direction of the buffer cylinder 12, so as to ensure that the buffer cylinder 12 and the lower die barrel 11 have a certain amount of fine sand; S20, pressing: the upper pressing pipe 21 coaxially corresponding to the through hole 1121 is controlled to descend by the punching unit 23, so that the bottom surface of the upper pressing pipe 21 abuts against the top surface of the position to be punched of the blank 4, so as to fix the position of the blank 4; S30, strengthening support: after part of the fine sand in the buffer cylinder 12 enters the lower die barrel 11 through the communication hole 121 by controlling the sealing plate 14 to move upward by the telescopic unit 13, the amount of fine sand in the lower die barrel 11 is increased, so that the fine sand contacts the bottom surface of the blank 4 to assist the support of the blank 4; S40, punching: the punch rod 22 in the upper pressing pipe 21 is controlled to descend by the telescopic unit 13, so as to punch the blank 4, and the waste after punching is discharged downward out of the lower die barrel 11 through the pipe through hole; S50, sand discharging: part of the fine sand in the lower die barrel 11 is controlled to enter the buffer cylinder 12 through the communication hole 121 by controlling the sealing plate 14 to move upward by the telescopic unit 13, so as to reduce the amount of fine sand in the lower die barrel 11, and reduce the amount of fine sand contacting the bottom surface of the blank 4; S60, taking material: the telescopic unit 13 controls the punch 22 and the upper pressing pipe 21 to move up to the position above the blank 4 which is punched and finished.

[0056] Further improvement is that between step S20 and step S30, step S21, sealing and pressurizing, is further included, the lifting unit 25 controls the upper die cover 24 to descend to the sealing station, after the upper die cover 24 and the lower die barrel 11 are enclosed to form a sealed cavity, high-pressure gas is introduced into the sealed cavity, so that the air pressure in the sealed cavity is greater than the external air pressure.

[0057] Compared with the prior art, the punching method of the embodiment, by controlling the sealing plate 14 to move in the buffer cylinder 12 through the telescopic unit 13, increasing the height of the buffer cylinder 12 before punching, so that the amount of fine sand in the lower die barrel 11 increases, and the fine sand can contact the bottom surface of the blank 4, cooperating with the high-pressure gas filled in the sealed cavity, so that a high-pressure environment is formed in the sealed cavity, and the high pressure is used to ensure the compaction of the fine sand, reduce the gap of the fine sand, facilitate the transmission of pressure between the fine sand, increase the contact area between the fine sand and the blank 4, so as to realize the auxiliary support of the blank 4, reduce the deformation of the blank 4 when the punch 22 punches, improve the punching precision, and further improve the product quality.

[0058] Moreover, before the fine sand is added into the lower die barrel 11, the upper pressing pipe 21 applies pressure to the edge of the blank 4 at the punching position, so that the upper pressing pipe 21 and the tubular support 112 cooperate with each other to lock and fix the position of the blank 4, so that after the fine sand enters the lower die barrel 11, the fine sand does not drive the blank 4 to move, causing the punching position to deviate, in addition, the upper pressing pipe 21 and the support 112 can seal the edge of the punching position to prevent the fine sand from entering, avoid affecting the movement of the punch 22, and ensure the smooth operation of the stamping unit 23.

[0059] After the punching is completed, the sealing plate 14 is lowered, and the high-pressure gas in the sealed cavity can promote the fine sand to flow quickly into the buffer cylinder 12 through the communication hole 121, so as to facilitate the fine sand to quickly separate from the blank 4, thereby improving the punching efficiency.

[0060] In the application, the particle size of the fine sand is preferably 0.15-0.3mm, in this particle size range, the fine sand can be quickly compacted by high-pressure gas to form a dense and uniform support, and under the action of high-pressure gas, it is easy to loosen and flow when discharging, thus avoiding that the fine sand is too small to be compacted and clumped by high-pressure gas, and it is difficult to loosen when discharging, and it may leak from the gap between the sealing plate 14 and the inner wall of the buffer cylinder 12, affecting its recycling, and avoiding that the fine sand is too large, causing the gap between the fine sand to increase, the auxiliary support effect of the fine sand to the blank 4 to decrease, causing the blank 4 to deform during punching, and also avoiding scratching the surface of the blank.

[0061] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, several improvements and refinements can be made without departing from the technical principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A punching device for a high-precision hydraulic torque converter cover plate, characterized in that, include: The lower die assembly includes a horizontal lower die barrel with an open top, a buffer cylinder fixedly penetrating the lower die barrel, a sealing plate sealed to the circumferential inner wall of the buffer cylinder, and a telescopic unit for driving the sealing plate to move axially along the buffer cylinder. The bottom of the lower die barrel is provided with a positioning element for radially positioning the blank and a support element for supporting the blank to be punched. The support element is provided with a through hole extending in the vertical direction. The buffer cylinder is provided with a connecting hole located above the bottom of the lower die barrel. The buffer cylinder and the lower die barrel are used to fill with fine sand to support the lower surface of the blank placed on the support element and the positioning element. The upper die assembly includes an upper pressure tube that is coaxially aligned with the through hole and positioned directly above it; a punch rod that is sealed to the inner circumferential wall of the upper pressure tube; and a punching unit that drives the upper pressure tube and the punch rod to rise and fall, pressing the upper pressure tube against the top surface of the blank to be punched, and then punching the blank through the punch rod. The outer diameter of the punch rod is less than or equal to the inner diameter of the corresponding through hole.

2. The punching device for the high-precision hydraulic torque converter cover plate according to claim 1, characterized in that: The upper mold assembly also includes an upper mold cover located directly above the lower mold barrel and pointing downwards, and a lifting unit that drives the upper mold cover to move vertically. The two ends of the upper mold cover's movement path are a sealing station and a pick-and-place station, respectively. In the sealing station, the upper mold cover and the lower mold barrel enclose a sealed cavity. In the pick-and-place station, a gap is provided between the upper mold cover and the lower mold barrel for picking up and placing the blank.

3. The punching device for the high-precision hydraulic torque converter cover plate according to claim 2, characterized in that: An inflation pipe is provided on the upper mold cover and / or the lower mold barrel. The inflation pipe is used to connect to a high-pressure air source and is equipped with an air valve.

4. The punching device for the high-precision hydraulic torque converter cover plate according to claim 2, characterized in that: An observation port is provided on the lower mold barrel and / or the upper mold cover, and the observation port is connected to an observation window.

5. The punching device for the high-precision hydraulic torque converter cover plate according to any one of claims 1-4, characterized in that: The stamping unit includes an axially vertical stamping cylinder. The cylinder barrel of the stamping cylinder is fixed to the upper die cover, and the bottom end of the piston rod is fixedly connected to the punch rod and connected to the upper pressure tube through a compression spring.

6. The punching device for the high-precision hydraulic torque converter cover plate according to claim 5, characterized in that: The upper pressure tubes are fixedly connected by a horizontal upper pressure ring. The outer diameter of the buffer cylinder is the same as the inner diameter of the blank. The upper pressure ring and the buffer cylinder are coaxial.

7. The punching device for the high-precision hydraulic torque converter cover plate according to any one of claims 1-4, characterized in that: Also includes: The material collection assembly includes a guide bucket located directly below the through hole with its top open facing the through hole and a collection bucket located below the guide bucket with its top open. The bottom of the guide bucket is provided with a discharge pipe, and the collection bucket is directly opposite the pipe opening at the bottom of the discharge pipe.

8. The punching device for the high-precision hydraulic torque converter cover plate according to claim 7, characterized in that: The collection bucket includes an upper bucket and a lower bucket that are inserted and connected in a vertical direction and are both open at the top. The bottom of the upper bucket is provided with a recycling through hole, which is located directly above the lower bucket. The diameter of the recycling through hole is larger than the particle size of the fine sand and smaller than the outer diameter of the punch.

9. A punching method for a high-precision hydraulic torque converter cover plate, characterized in that, Includes the following steps: S10. Preparation: Place the blank to be punched into the lower die barrel. The bottom of the lower die barrel is provided with a positioning component for radially positioning the blank and a support component for supporting the blank to be punched. The support component is provided with a through hole extending in the vertical direction. Through the cooperation of the positioning component and the lower die barrel, the blank is radially positioned and horizontally supported, so that the through hole is aligned with the blank to be punched. The bottom of the lower die barrel is also fixedly connected with a buffer cylinder. The buffer cylinder is provided with a connecting hole located above the bottom of the lower die barrel. The circumferential inner wall of the buffer cylinder is sealed with a sealing plate. The sealing plate is connected with a telescopic unit that drives it to move circumferentially along the buffer cylinder, ensuring that the buffer cylinder and the lower die barrel have a certain amount of fine sand. S20. Pressing: The stamping unit controls the upper pressure tube, which is directly above the through hole and has a coaxial centerline, to descend so that the bottom surface of the upper pressure tube abuts against the top surface of the blank to be punched, thereby fixing the position of the blank. S30. Strengthen support: The telescopic unit controls the sealing plate to move upward, so that some of the fine sand in the buffer cylinder enters the lower mold barrel through the connecting hole, thereby increasing the amount of fine sand in the lower mold barrel and providing auxiliary support to the billet after the fine sand contacts the bottom surface of the billet. S40, Punching: The telescopic unit controls the punch rod inside the upper pressure tube to descend and punch the blank, so that the waste material after punching is discharged downward through the tube through hole into the lower die barrel. S50, Sand discharge: The telescopic unit controls the sealing plate to move upward, so that some of the fine sand in the lower mold barrel enters the buffer cylinder through the connecting hole, reducing the amount of fine sand in the lower mold barrel, thereby reducing the amount of fine sand in contact with the bottom surface of the billet; S60, Material Retrieval: The telescopic unit controls the punch and upper pressure tube to move upward to above the blank after the punching is completed.

10. The punching method for the high-precision hydraulic torque converter cover plate according to claim 9, characterized in that: Between steps S20 and S30, there is also step S21, sealing and pressurizing: the lifting unit controls the upper mold cover to descend to the sealing position, so that the upper mold cover and the lower mold barrel form a sealed cavity, and then high-pressure gas is introduced into the sealed cavity to make the air pressure in the sealed cavity greater than the external air pressure.

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