Machining process for high-precision metal plate large-span ball diameter spinning belt pulley

Abstract

The invention relates to a machining technology for a high-precision metal plate large-span ball-diameter spinning belt pulley. The machining technology comprises the following steps that S1, a prototype is punched, specifically, the prototype is stretched into a disc-shaped blank in a punching mode; s2, periphery spinning is conducted, specifically, the disc-shaped blank is subjected to ball tooth groove crossing and rim spinning forming, and a spinning blank is obtained; s3, internal punching is conducted, specifically, plum blossom hole punching is conducted on the bottom face of a cavity of the spinning blank, and a prototype blank is obtained; s4, meter point notching is conducted, specifically, outer meter point notching and inner meter point notching are conducted on the radial plate face of the prototype blank and the bottom face of the cavity by positioning the inner diameter of the plum blossom hole; and S5, drilling is conducted, specifically, a plurality of dynamic balance holes distributed at intervals are drilled in one side of the lower surface of the upper rim of the prototype blank through inner meter point positioning, and the belt pulley is obtained. Mechanical clamping and frequent cutter replacement are not needed, so that the manufacturing cost is reduced, the material utilization rate of raw materials is increased, the meter point strength is improved, the unbalance value is reduced, the production efficiency is improved, and the service life of a product is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of pulley processing, and in particular to a high-precision sheet metal large-span ball diameter spinning pulley processing technology. Background Art

[0002] The existing pulley processing and manufacturing, for the large cross-ball diameter spinning pulley structure, its notable feature is that its cross-ball diameter is 240MM, which is at least 50MM larger than the cross-ball diameter of the conventional pulley, and the dynamic balance value requirement is very high, only 95gmm. In the general common pulley processing technology, forging blanks are mainly used for processing. The forging blanks need to undergo multiple machining to remove excess materials, so the material utilization rate is low, and the production cycle is slow, which is not suitable for large-scale production. In addition, turning destroys the metal fibers on the surface of the pulley tooth groove. There are micro cracks after turning, which reduces the fatigue strength of the pulley structure. At the same time, the tool turning pulley tooth groove surface roughness control cost is high, and the blade needs to be changed frequently. The finished machined pulley is heavy and needs to be clamped by a robot, and the manufacturing cost is too high.

[0003] Furthermore, in the market, the processing of the pulley's milling point is generally completed by CNC milling in a machining center. Since it is completely machined, it results in slow production cycle, low material utilization rate, high manufacturing cost, and the milling process has unstable surface roughness, and the milling tool needs to be replaced frequently. There are cutting marks on the milling surface, which reduces the strength of the milling point and affects the product life.

[0004] Therefore, the research purpose of the present invention is to design a high-precision sheet metal large-span ball diameter spinning pulley processing technology that does not require mechanical clamping and frequent tool replacement, thereby reducing manufacturing costs, and improving the material utilization rate of raw materials, increasing the rice point strength, reducing the imbalance value, and thereby improving production efficiency and product life. Summary of the invention

[0005] In view of the technical problems existing in the prior art, the present invention provides a high-precision sheet metal large-span ball diameter spinning pulley processing technology, which can effectively solve the technical problems existing in the prior art.

[0006] The technical solution of the present invention is: A high-precision sheet metal large-span ball diameter spinning pulley processing technology comprises the following steps: S1, prototype stamping: the steel coil blank is stretched into a disc-shaped blank by stamping; S2, peripheral spinning: the disc-shaped blank of step S1 is subjected to spinning forming across the ball tooth groove and the wheel rim to obtain a spinning blank, wherein the groove angle, R angle and tooth center height of the formed tooth groove need to be controlled; S3, internal punching: punching a plum blossom hole on the bottom surface of the cavity of the spinning blank to obtain a prototype blank, wherein the tolerance of the plum blossom hole needs to be controlled; S4, punching notches: Punching outer and inner notches on the spoke surface and cavity bottom of the blank by locating the inner diameter of the plum blossom hole, wherein the inner diameter of the notch, the concentricity of the inner and outer notches, the tooth center height, the position of the small hole, and the axial and radial runout of the tooth groove need to be controlled; S5, drilling: Drill several dynamic balancing holes with different spacing on one side of the lower surface of the upper rim of the prototype through internal rice point positioning to obtain a pulley, wherein the unbalance value of the pulley and the depth of the dynamic balancing hole must be guaranteed.

[0007] The prototype stamping in step S1 includes S11 stamping and blanking, S12 stamping and stretching, and S13 trimming and turning; the stamping and blanking is to first unfold and flatten the steel coil and stamp it into a circular blank; the stamping and stretching is to stretch the circular blank into a disc-shaped blank, and the cross-section of the disc-shaped blank is composed of 2 trapezoids, wherein the height and inclination of the disc-shaped blank need to be controlled; the trimming and turning is to turn the outer edge of the disc-shaped blank to remove the concave and convex ears caused by the anisotropy of the raw materials.

[0008] After the disc-shaped blank undergoes gear spinning in step S21, it also needs to undergo post-spinning turning in step S22 and post-spinning turning II in sequence. The post-spinning turning and post-spinning turning II are used to turn the center hole and rim edge of the disc-shaped blank respectively, and the rim flash is turned using the tooth groove, and the outer diameter and height of the rim are controlled.

[0009] The internal punching of step S3 includes step S31 of punching plum blossom holes, small holes and marks and step S32 of punching II of de-duplication holes, wherein the small holes are evenly arranged around the plum blossom holes and staggered with the petals of the plum blossom holes, and the diameters of the plum blossom holes and the small holes and the position tolerances of the small holes need to be controlled; the punching II needs to evenly punch out a plurality of irregular de-duplication holes on the side of the cavity of the prototype blank by positioning the inner diameter of the plum blossom holes, and the de-duplication holes extend downward to the bottom of the cavity, the number of the de-duplication holes corresponds to the plum blossom holes, and they are staggered with the petals of the plum blossom holes, wherein the position of the de-duplication holes, the axial and radial runout of the tooth slots and the size of the dynamic balance need to be controlled.

[0010] The inner diameter of the rice point in step S4 is +0.043 / -0, the concentricity of the inner and outer rice points is 0.1max, the verticality of the inner rice point is 0.1max, and the relative rice point runout of the tooth profile is 0.4max.

[0011] The punching of the inner and outer rice points in step S4 requires a hydraulic press of 315T or above, and the main cylinder pressure is 20~40Mpa.

[0012] The pressure holding time and pressure release time of the punching inner and outer rice points in step S4 are 0.8-1.2s.

[0013] The groove punching in step S4 is a synchronous groove punching of multiple inner and outer grooves, and the inner and outer grooves are staggered. The outer and inner grooves are respectively on specific diameters of the corresponding inner arcs, and the inner and outer grooves are not on the same diameter.

[0014] The step S4 is implemented based on a punching die for processing the pulley point structure, and the punching die for processing the pulley point structure includes: The camming plate is an upper and lower part of the camming plate, and the lower part of the camming plate is a lower part of the camming plate, and the camming plate is a lower part of the camming plate. The cam is provided with a plurality of lower support plates, and the upper part of the plurality of lower support plates ... A positioning component, wherein a guide column extending through and extending to the top of the lower stripping plate is fixedly installed on the top of the lower stop plate, and the positioning component comprises an elastic rubber member which can be sleeved up and down on the outside of the guide column, and petal portions adapted to the plum blossom holes are integrally extended outwardly and fixedly connected on all four sides of the elastic rubber member, and a circle of metal sheets are fixedly bonded to the outer surface of the petal portion along the four sides at intervals, and the top of the petal portion is a hemispherical protrusion, and holes arranged from top to bottom are distributed at intervals inside it; during the process of pressing the pulley of the upper mold assembly under the action of external pressure, the aperture of the hole gradually decreases.

[0015] The top of the lower stop plate of the lower mold assembly is also provided with a pipe position whose top end penetrates to the top of the lower stripping plate.

[0016] Advantages of the present invention: 1) The present invention realizes the processing technology of spinning pulleys with large cross-ball diameters, and the processing technology of the pulley is stamping blanking-stamping stretching-turning before spinning-spinning-turning after spinning-turning after spinning-punching plum blossom holes, small holes and markings-punching de-duplicate holes-deburring-punching internal and external rice points-dynamic balancing holes. The present invention forms the pulley tooth grooves by sheet metal spinning, and the tooth groove size is guaranteed by spinning, which improves the surface hardness of the tooth grooves, reduces the surface roughness of the tooth grooves, and ensures the product size and performance quality; and the internal and external rice points, plum blossom holes, small holes and de-duplicate holes are guaranteed by the stamping die, which can not only achieve high precision of the rice point inner diameter and punching hole diameter, but also ensure the tooth shape runout, small hole position, de-duplicate hole surface contour and internal and external rice point concentricity tolerance; furthermore, the product can reach a very small unbalance value by drilling dynamic balancing; the sheet metal material of the process scheme of the present invention adopts SPHE, which has good material plasticity and is suitable for spinning forming, effectively improves material utilization, fast production cycle, is more suitable for large-scale production, and has lower manufacturing cost.

[0017] 2) The present invention adopts an optimized and improved stamping die to produce the internal and external milling point structure, which not only has a high material utilization rate, but also has high production efficiency and low cost. It can realize mass production of pulleys with milling points. The stamping process replaces the milling machining process to avoid the instability of the surface roughness of the machined milling points, which causes large roughness and micro defects. The stamping plastic forming is used to improve the surface hardness and strength performance of the milling points; at the same time, the machining area is reduced, the material utilization rate is improved, and the production efficiency is greatly improved, and the manufacturing cost of the milling points is reduced.

[0018] The working process of the mold of the present invention is as follows: the workpiece is placed on the lower stripping plate and positioned by the flower-shaped arc of the workpiece. When the slider of the hydraulic press slides down, the upper stripping plate first contacts the pulley cavity and presses down. After the lower stripping plate descends together for a distance, the upper mold rice point male and the lower mold rice point male contact the pulley spoke plate surface and the cavity bottom surface respectively and continue to press down. After the mold is closed, the pulley spoke plate surface is subjected to the pressure of the upper mold rice point male, and the lower stripping insert acts on the pulley cavity bottom surface and realizes the inner rice point forming of the pulley together with the upper mold rice point male; the pulley cavity bottom surface is subjected to the pressure of the lower mold rice point male, and the upper stripping insert acts on the pulley spoke plate surface and realizes the outer rice point forming of the pulley together with the lower mold rice point male. When the slider of the hydraulic press rises, the upper mold rice point male and the upper stripping insert are separated from the pulley under the action of the upper stripping plate, and the lower mold rice point male and the lower stripping insert are separated from the pulley under the action of the lower stripping plate.

[0019] The processing technology of the present invention: Due to the strict requirements on the size and appearance of the rice point, such as the inner diameter of the rice point +0.043 / -0, the concentricity of the inner and outer rice points 0.1max, the verticality of the inner rice point 0.1max, and the relative jump of the tooth shape to the rice point 0.4max, it is difficult to produce qualified products according to conventional process parameters, so it is necessary to continuously optimize and debug the relevant equipment parameters. The mold is installed on a 315T hydraulic press, and the main cylinder pressure is set to the maximum 20Mpa. If it is too small, the inner diameter of the rice point and the verticality of the inner rice point will be unqualified; the pressure holding time and the pressure release time are set to 1s.

[0020] 3) The present invention achieves synchronous spinning of inner and outer rice points through the cooperation of the upper die assembly and the lower die assembly, improves the accuracy of rice point processing, and adds corresponding positioning components. The corresponding elastic rubber parts are sleeved by the guide column moving up and down. The elastic rubber parts are integrally extended outward on all sides and fixed with petal parts that match the plum blossom hole. The outer surface of the petal part is fixedly bonded with a circle of metal sheets at intervals along the four edges. The top of the petal part is in the shape of a hemispherical protrusion, and holes arranged from top to bottom are distributed inside it at intervals. When the hydraulic press is pressed down, the hemispherical protrusion of the petal part is pressed in advance and extruded, so that the petal part expands to the surroundings so that the metal sheet connected to it abuts against the inner hole side wall of the plum blossom hole of the workpiece, thereby achieving preliminary positioning. If a simple rubber part is used for positioning, the rubber part is in flexible contact with the inner wall of the workpiece. In this way, if the size of the plum blossom hole of the workpiece is not accurate enough, the rubber part will easily be squeezed and deformed in the part that first contacts the inner wall of the workpiece. Compared with the simple rubber part positioning, the metal sheet can ensure rigid contact while dispersing the local force, thereby ensuring the balance of the supporting force in the plum blossom hole. Even if the processing size of the plum blossom hole of the workpiece deviates, it will not affect the subsequent positioning processing of the rice point and dynamic balancing hole, thereby ensuring the processing accuracy. When further pressed down, after the extrusion amount of the elastic rubber part reaches a certain level, the elastic rubber part will have relative rigidity, and cooperate with the metal sheet to fully support the plum blossom hole of the workpiece.

[0021] The arrangement of holes can form many micro-pore cavities in the elastic rubber parts. When the workpiece vibrates through the holes during rolling, resonance energy consumption will be generated, thereby reducing the vibration during rolling. When the pressure is gradually reduced, the resonance frequency in the hole changes gradually, and the resonance efficiency is higher. Finally, the hole will heat up and consume the vibration energy caused by stamping. The positioning component can not only ensure the positioning of the workpiece stamping, but also provide the accuracy of the meter point notch.

[0022] 4) In addition to ensuring the product size by setting the correct parameters of the hydraulic press, the clearance between the mold and the product also has a great influence on the product size. The product size can be effectively guaranteed by setting a specific gap between the pipe position and the plum blossom hole of the product. If the gap is too large, it will affect the product tooth profile runout and other related dimensions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flow chart of the present invention.

[0024] Figure 2 Schematic diagram of the state of the pulley during the processing of each step of the present invention.

[0025] Figure 3 It is a schematic diagram of the structure of a pulley prepared by the processing technology of the present invention.

[0026] Figure 4 It is a structural schematic diagram of the stamping die used for processing the pulley rice point structure in the present invention.

[0027] Figure 5 It is a schematic structural diagram of the positioning assembly in the stamping die of the present invention.

[0028] Figure 6 for Figure 5 Schematic cross-section diagram.

[0029] In the accompanying drawings: rectangular spring 1, upper die green spring 2, upper supporting plate 3, upper pad 4, upper die equal height screw 5, upper die seat 6, upper pad 7, upper die rice point male 8, upper clamping plate 9, upper stop plate 10, upper stripping plate 11, upper template 12, lower stripping plate 13, lower die equal height screw 14, lower stop plate 15, lower clamping plate 16, lower pad 17, lower die seat 18, lower pad 19, lower striking plate 20, lower supporting plate 21, lower die green spring 22, nitrogen spring 23, lower clamp 24, ejector 25, lower die rice point male 26, lower stripping sub 27, guide column 28, positioning assembly 29, elastic rubber part 291, petal part 2911, hole 2912, metal sheet 292, pipe position 30, upper stripping sub 31, upper clamp 32, workpiece 33. DETAILED DESCRIPTION

[0030] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the embodiments in conjunction with the accompanying drawings: Embodiment 1 refer to Figure 1-3 , a high-precision sheet metal large-span ball diameter spinning pulley processing technology, comprising the following steps: S1, prototype stamping: the steel coil blank is stretched into a disc-shaped blank by stamping; S2, peripheral spinning: the disc-shaped blank of step S1 is subjected to spinning forming across the ball tooth groove and the wheel rim to obtain a spinning blank, wherein the groove angle, R angle and tooth center height of the formed tooth groove need to be controlled; S3, internal punching: punching a plum blossom hole on the bottom surface of the cavity of the spinning blank to obtain a prototype blank, wherein the tolerance of the plum blossom hole needs to be controlled; S4, punching notches: Punching outer and inner notches on the spoke surface and cavity bottom of the blank by locating the inner diameter of the plum blossom hole, wherein the inner diameter of the notch, the concentricity of the inner and outer notches, the tooth center height, the position of the small hole, and the axial and radial runout of the tooth groove need to be controlled; S5, drilling: Drill several dynamic balancing holes with different spacing on one side of the lower surface of the upper rim of the prototype through internal rice point positioning to obtain a pulley, wherein the unbalance value of the pulley and the depth of the dynamic balancing hole must be guaranteed.

[0031] The present invention realizes a large-span ball diameter spinning pulley processing technology, and the pulley processing technology is stamping blanking-stamping stretching-turning before spinning-spinning-turning after spinning-turning after spinning-punching plum blossom holes, small holes and marks-punching de-duplicate holes-deburring-punching internal and external rice points-dynamic balancing holes. The present invention forms the pulley tooth groove by sheet metal spinning, and the tooth groove size is guaranteed by spinning, which improves the surface hardness of the tooth groove, reduces the surface roughness of the tooth groove, and ensures the product size and performance quality; and the internal and external rice points, plum blossom holes, small holes and de-duplicate holes are guaranteed by the stamping die, which can not only achieve high precision of the rice point inner diameter and punching hole diameter, but also ensure the tooth shape runout, small hole position, de-duplicate hole surface contour and internal and external rice point concentricity tolerance; furthermore, the product is made to reach a very small unbalance value by drilling dynamic balancing; the sheet metal material of the process scheme of the present invention adopts SPHE, the material has good plasticity, is suitable for spinning, the material utilization rate is effectively improved, the production cycle is fast, it is more suitable for large-scale production, and the manufacturing cost is lower.

[0032] The prototype stamping in step S1 includes S11 stamping and blanking, S12 stamping and stretching, and S13 trimming and turning; the stamping and blanking is to first unfold and flatten the steel coil and stamp it into a circular blank; the stamping and stretching is to stretch the circular blank into a disc-shaped blank, and the cross-section of the disc-shaped blank is composed of two trapezoids, wherein the height and inclination of the disc-shaped blank need to be controlled; the trimming and turning is to turn the outer edge of the disc-shaped blank to remove the concave and convex ears caused by the anisotropy of the raw materials.

[0033] After the disc-shaped blank undergoes gear spinning in step S21, it also needs to undergo post-spinning turning in step S22 and post-spinning turning II in sequence. The post-spinning turning and post-spinning turning II are used to turn the center hole and rim edge of the disc-shaped blank respectively, and the rim flash is turned using the tooth groove, and the outer diameter and height of the rim are controlled.

[0034] The internal punching of step S3 includes step S31 of punching plum blossom holes, small holes and marks and step S32 of punching II of de-duplication holes, wherein the small holes are evenly arranged around the plum blossom holes and staggered with the petals of the plum blossom holes, and the diameters of the plum blossom holes and the small holes and the position tolerances of the small holes need to be controlled; the punching II needs to evenly punch out a plurality of irregular de-duplication holes on the side of the cavity of the prototype blank by positioning the inner diameter of the plum blossom holes, and the de-duplication holes extend downward to the bottom of the cavity, the number of the de-duplication holes corresponds to the plum blossom holes, and they are staggered with the petals of the plum blossom holes, wherein the position of the de-duplication holes, the axial and radial runout of the tooth slots and the size of the dynamic balance need to be controlled.

[0035] The inner diameter of the rice point in step S4 is +0.043 / -0, the concentricity of the inner and outer rice points is 0.1max, the verticality of the inner rice point is 0.1max, and the relative rice point runout of the tooth profile is 0.4max.

[0036] The punching of the inner and outer rice points in step S4 requires a hydraulic press of 315T or above, and the main cylinder pressure is 20~40Mpa.

[0037] The pressure holding time and pressure release time of the punching inner and outer rice points in step S4 are 1 s.

[0038] The groove punching in step S4 is a synchronous groove punching of multiple inner and outer grooves, and the inner and outer grooves are staggered. The outer and inner grooves are respectively on specific diameters of the corresponding inner arcs, and the inner and outer grooves are not on the same diameter.

[0039] Embodiment 2 refer to Figure 4-6 A high-precision sheet metal large-span ball diameter spinning pulley processing technology is based on a punching die for the punching of the pulley's punching structure. The punching die for the punching of the pulley's punching structure includes: The upper die assembly comprises an upper die base 6 supported and installed below the upper support plate 3 by a plurality of upper pads 4, an upper pad plate 7, an upper clamping plate 9, an upper stop plate 10 and an upper stripping plate 11 are sequentially connected below the upper die base 6 from top to bottom, an upper die plate 12 is provided below the upper clamping plate 9 and is located at the outer side of the upper stop plate 10 and the upper stripping plate 11, the upper stop plate 10 and the upper support plate 3 are installed on the upper clamping plate 9 by corresponding upper die equal height screws 5, and a spacer for The upper stop plate 10 and the upper stripping plate 11 push downwardly out of the rectangular spring 1, one end of the rectangular spring 1 is fixed on the upper die seat 6 and respectively penetrates the upper pad 7 and the upper clamping plate 9 and then abuts against the upper stop plate 10, and the upper die seat 6 is provided with a plurality of upper stripping subs 31 at intervals through the corresponding upper die green spring 2 and the upper clamping sub 32, the lower end surface of the upper stripping sub 31 extends to the lower end surface of the upper stripping plate 11, and the upper clamping plate 9 is provided with an upper die rice point male 8 staggered with the upper stripping sub 31; The lower die assembly is arranged directly below the upper die assembly, and includes a lower die base 18 supported and installed above a lower support plate 21 by a plurality of lower pads 19. A lower pad 17, a lower clamping plate 16, a lower stop plate 15 and a lower stripping plate 13 are sequentially connected above the lower die base 18 from bottom to top. The lower stop plate 15 and the lower support plate 21 are installed on the lower clamping plate 16 through corresponding lower die equal height screws 14. A nitrogen spring 23 for ejecting the lower stop plate 15 and the lower stripping plate 13 upward is installed on the lower die base 18. The nitrogen spring One end of 23 is fixed on the lower die seat 18, and the other end is connected to a push rod 25 whose top abuts against the lower end surface of the lower stop plate 15 through a corresponding lower punching plate. A plurality of lower disengagement sons 27 corresponding to and matching the upper die rice point male 8 are installed on the lower die seat 18 through corresponding lower die green springs 22 and lower clamping sons 24. The upper end surface of the lower disengagement son 27 extends to the upper end surface of the lower disengagement plate 13. A lower die rice point male 26 corresponding to and matching the upper disengagement son 31 is arranged above the lower pad 17; A positioning component 29, wherein a guide column 28 extending through and extending to the top of the lower release plate 13 is fixedly installed on the top of the lower stop plate 15, and the positioning component 29 comprises an elastic rubber member 291 which can be sleeved up and down on the outside of the guide column 28, and a petal portion 2911 adapted to the plum blossom hole is integrally extended outwardly on all sides of the elastic rubber member 291, and a circle of metal sheets 292 are fixedly bonded to the outer surface of the petal portion 2911 along the four edges at intervals, and the top of the petal portion 2911 is a hemispherical protrusion, and holes 2912 arranged from top to bottom are distributed at intervals inside it; during the process of pressing the pulley of the upper mold assembly under the action of external pressure, the aperture of the hole 2912 is gradually reduced.

[0040] The present invention adopts an optimized and improved stamping die to produce the internal and external milling point structures, which not only has a high material utilization rate, but also has high production efficiency and low cost, and can realize batch production of pulleys with milling points. The stamping process replaces the milling machining process, thereby avoiding the instability of the surface roughness of the machined milling points, the large roughness and micro defects caused by the machined milling points, and the stamping plastic forming is used to improve the surface hardness and strength performance of the milling points; at the same time, the machining area is reduced, the material utilization rate is improved, and the production efficiency is greatly improved, and the milling point manufacturing cost is reduced.

[0041] The working process of the mold of the present invention is as follows: the workpiece 33 is placed on the lower stripping plate 13 and positioned by the flower-shaped arc of the workpiece 33. When the slider of the hydraulic press slides down, the upper stripping plate 11 first contacts the pulley cavity and presses down. After the lower stripping plate 13 is lowered for a distance, the upper mold rice point male 8 and the lower mold rice point male 26 contact the pulley spoke plate surface and the cavity bottom surface respectively and continue to press down. After the mold is closed, the pulley spoke plate surface is subjected to the pressure of the upper mold rice point male 8, and the lower stripping son acts on the pulley cavity bottom surface and realizes the inner rice point forming of the pulley together with the upper mold rice point male 8; the pulley cavity bottom surface is subjected to the pressure of the lower mold rice point male 26, and the upper stripping son acts on the pulley spoke plate surface and realizes the outer rice point forming of the pulley together with the lower mold rice point male 26. When the slider of the hydraulic press rises, the upper mold rice point male 8 and the upper stripping son are separated from the pulley under the action of the upper stripping plate 11, and the lower mold rice point male 26 and the lower stripping son are separated from the pulley under the action of the lower stripping plate 13.

[0042] Processing technology of the present invention: Due to the strict requirements on the size and appearance of the rice point, such as the inner diameter of the rice point +0.043 / -0, the concentricity of the inner and outer rice points 0.1max, the verticality of the inner rice point 0.1max, and the relative jump of the tooth shape to the rice point 0.4max, it is difficult to produce qualified products according to conventional process parameters, so it is necessary to continuously optimize and debug the relevant equipment parameters. The mold is installed on a 315T hydraulic press, and the main cylinder pressure is set to the maximum 20Mpa. If it is too small, the inner diameter of the rice point and the verticality of the inner rice point will be unqualified; the pressure holding time and the pressure release time are set to 1s.

[0043] The present invention realizes synchronous spinning forming of inner and outer rice points through the cooperation of the upper die assembly and the lower die assembly, improves the accuracy of rice point processing, and adds a corresponding positioning assembly 29, and a corresponding elastic rubber member 291 is sleeved by the guide column 28 moving up and down, and the four sides of the elastic rubber member 291 are integrally extended outward and fixed with a petal portion 2911 adapted to the plum blossom hole, and the outer surface of the petal portion 2911 is fixedly bonded with a circle of metal sheets 292 at intervals along the four sides, and the top of the petal portion 2911 is a hemispherical protrusion, and holes 2912 arranged from top to bottom are distributed at intervals inside it; when the hydraulic press is pressed down, the hemispherical protrusion of the petal portion 2911 is pressed in advance and extruded, so that the petal portion 2911 expands to the four sides so that the metal sheet 292 connected thereto abuts against the inner hole side of the plum blossom hole of the workpiece 33. The rubber part 291 is on the wall to achieve preliminary positioning; if a simple rubber part is used for positioning, the rubber part is in flexible contact with the inner wall of the workpiece 33. In this way, if the size of the plum blossom hole of the workpiece 33 is not accurate enough, the rubber part is easy to be squeezed and deformed in the part that first contacts the inner wall of the workpiece 33. Compared with the simple rubber part positioning, the metal sheet 292 can ensure rigid contact while dispersing the local force, thereby ensuring the balance of the supporting force in the plum blossom hole. Even if the processing size of the plum blossom hole of the workpiece 33 deviates, it will not affect the subsequent positioning processing of the rice point and the dynamic balancing hole, thereby ensuring the processing accuracy; when further pressed down, after the extrusion amount of the elastic rubber part 291 reaches a certain level, the elastic rubber part 291 will have relative rigidity, and cooperate with the metal sheet 292 to fully support the plum blossom hole of the workpiece 33.

[0044] The arrangement of the holes 2912 can form a number of microporous accommodating cavities in the elastic rubber member 291. When the workpiece 33 vibrates through the holes 2912 during rolling, resonance energy consumption will be generated, thereby reducing the vibration during rolling. When the pressure is gradually reduced, the resonance frequency in the holes 2912 changes gradually, and the resonance efficiency is improved. Finally, the holes 2912 will heat up and consume the vibration energy caused by stamping. The positioning component 29 can not only ensure the positioning of the workpiece 33 during stamping, but also provide the accuracy of the rice point punching.

[0045] Embodiment 2 refer to Figure 4 The difference between this embodiment and the first embodiment is that a pipe position 30 is further provided at the top of the lower stop plate 15 of the lower mold assembly, the top of the pipe position 30 penetrating to the top of the lower stripping plate 13.

[0046] In addition to ensuring the product size by setting the correct parameters of the hydraulic press, the matching clearance between the mold and the product also has a great influence on the product size. The product size can be effectively guaranteed by setting a specific gap between the pipe position 30 and the plum blossom hole of the product. If the gap is too large, it will affect the product tooth profile runout and other related dimensions.

[0047] It should be pointed out that the implementation principle and technical effects of this embodiment are the same as those of Embodiment 1. For the sake of brief description, for matters not mentioned in this embodiment, reference may be made to the corresponding contents in Embodiment 1.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high-precision sheet metal large-span ball diameter spinning pulley processing technology, characterized in that: The steps include: S1, prototype stamping: the steel coil blank is stretched into a disc-shaped blank by stamping; S2, peripheral spinning: the disc-shaped blank of step S1 is subjected to spinning forming across the ball tooth groove and the wheel rim to obtain a spinning blank, wherein the groove angle, R angle and tooth center height of the formed tooth groove need to be controlled; S3, internal punching: punching a plum blossom hole on the bottom surface of the cavity of the spinning blank to obtain a prototype blank, wherein the tolerance of the plum blossom hole needs to be controlled; S4, punching notches: Punching outer and inner notches on the spoke surface and cavity bottom of the blank by locating the inner diameter of the plum blossom hole, wherein the inner diameter of the notch, the concentricity of the inner and outer notches, the tooth center height, the position of the small hole, and the axial and radial runout of the tooth groove need to be controlled; S5, drilling: Drill several dynamic balancing holes with different spacing on one side of the lower surface of the upper rim of the prototype through internal rice point positioning to obtain a pulley, wherein the unbalance value of the pulley and the depth of the dynamic balancing hole must be guaranteed.

2. A high-precision sheet metal large-span ball diameter spinning pulley processing process according to claim 1, characterized in that: The prototype stamping in step S1 includes S11 stamping and blanking, S12 stamping and stretching, and S13 trimming and turning; the stamping and blanking is to first unfold and flatten the steel coil and stamp it into a circular blank; the stamping and stretching is to stretch the circular blank into a disc-shaped blank, and the cross-section of the disc-shaped blank is composed of 2 trapezoids, wherein the height and inclination of the disc-shaped blank need to be controlled; the trimming and turning is to turn the outer edge of the disc-shaped blank to remove the concave and convex ears caused by the anisotropy of the raw materials.

3. The high-precision sheet metal large-span ball diameter spinning pulley processing process according to claim 1 is characterized in that: After the disc-shaped blank undergoes gear spinning in step S21, it also needs to undergo post-spinning turning in step S22 and post-spinning turning II in sequence. The post-spinning turning and post-spinning turning II are used to turn the center hole and rim edge of the disc-shaped blank respectively, and the rim flash is turned using the tooth groove, and the outer diameter and height of the rim are controlled.

4. The high-precision sheet metal large-span ball diameter spinning pulley processing process according to claim 1 is characterized in that: The internal punching of step S3 includes step S31 of punching plum blossom holes, small holes and marks, step S32 of punching II of de-duplication holes and step S33 of removing punching burrs, wherein the small holes are evenly arranged around the plum blossom holes and staggered with the petals of the plum blossom holes, and the diameters of the plum blossom holes and the small holes and the position tolerances of the small holes need to be controlled; the punching II needs to evenly punch out a plurality of irregular de-duplication holes on the side of the cavity of the prototype blank by positioning the inner diameter of the plum blossom holes, and the de-duplication holes extend downward to the bottom of the cavity, the number of the de-duplication holes corresponds to the plum blossom holes, and they are staggered with the petals of the plum blossom holes, wherein the position of the de-duplication holes, the axial and radial runout of the tooth slots and the size of dynamic balance need to be controlled.

5. The high-precision sheet metal large-span ball diameter spinning pulley processing process according to claim 1 is characterized in that: The inner diameter of the rice point in step S4 is +0.043 / -0, the concentricity of the inner and outer rice points is 0.1max, the verticality of the inner rice point is 0.1max, and the relative rice point runout of the tooth profile is 0.4max.

6. The high-precision sheet metal large-span ball diameter spinning pulley processing process according to claim 1 is characterized in that: The punching of the inner and outer rice points in step S4 requires a hydraulic press of 315T or above, and the main cylinder pressure is 20~40Mpa.

7. The high-precision sheet metal large-span ball diameter spinning pulley processing process according to claim 1 is characterized in that: The pressure holding time and pressure release time of the punching inner and outer rice points in step S4 are 0.8-1.2s.

8. The high-precision sheet metal large-span ball diameter spinning pulley processing process according to claim 1 is characterized in that: The groove punching in step S4 is a synchronous groove punching of multiple inner and outer grooves, and the inner and outer grooves are staggered. The outer and inner grooves are respectively on specific diameters of the corresponding inner arcs, and the inner and outer grooves are not on the same diameter.

9. The high-precision sheet metal large-span ball diameter spinning pulley processing process according to claim 1 is characterized in that: The step S4 is implemented based on a punching die for processing the pulley point structure, and the punching die for processing the pulley point structure includes: The camming plate is an upper and lower part of the camming plate, and the lower part of the camming plate is a lower part of the camming plate, and the camming plate is a lower part of the camming plate. The cam is provided with a plurality of lower support plates, and the upper part of the plurality of lower support plates ... A positioning component, wherein a guide column extending through and extending to the top of the lower stripping plate is fixedly installed on the top of the lower stop plate, and the positioning component comprises an elastic rubber member which can be sleeved up and down on the outside of the guide column, and petal portions adapted to the plum blossom holes are integrally extended outwardly and fixedly connected on all four sides of the elastic rubber member, and a circle of metal sheets are fixedly bonded to the outer surface of the petal portion along the four sides at intervals, and the top of the petal portion is a hemispherical protrusion, and holes arranged from top to bottom are distributed at intervals inside it; during the process of pressing the pulley of the upper mold assembly under the action of external pressure, the aperture of the hole gradually decreases.

10. A high-precision sheet metal large-span ball diameter spinning pulley processing process according to claim 9, characterized in that: The top of the lower stop plate of the lower mold assembly is also provided with a pipe position whose top end penetrates to the top of the lower stripping plate.

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