A high-precision sheet metal belt wheel pattern forming method and device

Abstract

The application discloses a high-precision metal plate manufacturing belt wheel pattern forming method and equipment, S1. The embossed blank is prepared through a front stamping process, the center hole diameter of the embossed blank is controlled to be 0.39 times the diameter of the pattern petal contour edge, and the embossed surface material thickness of the embossed blank is 0.9-1.1 times the thickness of the raw material; S2. Stretching oil is applied to the outer diameter surface of the embossed blank, and the embossed surface of the embossed blank is cleaned by the surface treatment unit; the application realizes a systematic treatment scheme through a process-equipment collaborative mechanism, solves the cause-and-effect chain of flow instability-forming rebound-contour out-of-tolerance through center hole diameter, material thickness, surface treatment, positioning accuracy and giving-up design, so that the high-precision pattern forming meets the 0.015mm contour degree and R angle tolerance requirements, and the product qualification rate is improved.

Description

TECHNICAL FIELD

[0001] The application is a high-precision metal plate belt wheel pattern forming method and device, which belongs to the technical field of belt wheel pattern forming. BACKGROUND

[0002] In the field of automobile, engineering machinery and precision transmission system manufacturing, belt wheel pattern forming is a core process link, which directly affects the transmission efficiency, noise control and product life. With the increasing demand for lightweight and high precision in the industry, such as the ISO10099 standard requiring the profile tolerance to be ≤0.05mm, the traditional stamping equipment cannot meet the strict tolerance requirements of the profile petal profile tolerance ≤0.015mm and R angle R0.5±0.5mm. The existing equipment is mostly based on general stamping platform modification, lacking special control mechanism for pattern forming, resulting in low yield of high value-added products, and urgent need for systematic optimization.

[0003] The existing equipment does not set the 0.39 times proportional relationship between the center hole diameter and the edge diameter of the petal profile, which is easy to cause uneven distribution of radial stress of the blank material in stamping, and uncontrollable thickness fluctuation of the embossed surface material, making the material outflow rate uncontrollable;

[0004] And the residual drawing oil interferes with the flow characteristics, aggravates material accumulation or thinning, and the surface treatment unit lacks precise cleaning and outer diameter directional oiling, the residual drawing oil interferes with the flow characteristics, aggravates material accumulation or thinning;

[0005] At the same time, due to the insufficient positioning accuracy of the workbench, the embossing punch is eccentric, and after the material outflow is unstable, the embossing punch positioning ring cannot generate effective reaction force at the critical point, the petal surface cannot be tightly formed, and the material flow is out of control and the positioning deviation causes the excess material to be stacked disorderly, which cannot accommodate the long and short pattern materials with uneven thickness, finally causing the petal surface profile tolerance >0.015mm, total profile tolerance >0.04mm and R angle size out of tolerance.

[0006] Due to the systematic defects of the center hole diameter, material thickness, surface treatment, positioning accuracy and allowance design of the existing equipment, the causal chain of flow instability-formation rebound-profile out-of-tolerance is formed, which causes the high-precision pattern forming to fail to meet the 0.015mm profile tolerance and R angle tolerance requirements, resulting in low product qualification rate. SUMMARY

[0007] In view of the deficiencies of the prior art, the application aims to provide a high-precision metal plate belt wheel pattern forming method and device to solve the problems of the prior art.

[0008] In order to achieve the above-mentioned purpose, the application is realized by the following technical scheme:

[0009] A high-precision metal plate belt wheel pattern forming method, the steps comprising:

[0010] S1. Prepare the embossed blank by the front stamping process, control the center hole diameter of the embossed blank to be 0.39 times the diameter of the pattern petal contour edge, and the embossed surface material thickness of the embossed blank to be 0.9-1.1 times the thickness of the raw material;

[0011] S2. Apply drawing oil to the outer diameter surface of the embossed blank, and clean the embossed surface of the embossed blank by the surface treatment unit;

[0012] S3. Position the treated embossed blank on the workbench through the precise positioning assembly, so that the inner diameter of the embossed blank forms a 0.05mm interference fit with the embossing punch positioning ring, and ensure that the center of the embossing punch is concentric with the center of the cylindrical blank;

[0013] S4. Implement the embossing process by the embossing forming assembly, control the material outflow by the reaction force of the embossing punch positioning ring, and stop further outflow when the material outflow reaches an appropriate degree, to ensure that the embossed petal surface is full and firm;

[0014] S5. Refine the preliminary pattern through the relief flower groove between the pattern petal tabs in the upper module, when the embossed surface material thickness is thick, the excess material flows into the relief flower groove corresponding to the length and short flower shape of the workpiece pattern, reducing the material rebound effect, while controlling the holding time and unloading speed, so that the pattern reaches the final stable state after elastic recovery, forming a high-precision belt pulley pattern product with a petal surface contour of 0.015mm, a total pattern surface contour of 0.04mm, and a pattern R angle of R0.5±0.5mm.

[0015] As a further improvement, step S1 includes:

[0016] Control the embossed surface end face thickness to be 0.9-1.1 times the thickness of the raw material, ensure that the outer diameter accuracy of the embossed blank is within ±0.02mm, and perform quality inspection on the prepared embossed blank, including measurement of the center hole diameter, embossed surface material thickness and cylindrical outer diameter.

[0017] As a further improvement, step S2 includes:

[0018] Use a non-fiber wiping cloth to thoroughly clean the embossed surface, ensuring no oil film residue, and only apply drawing oil evenly on the outer diameter surface of the cylinder, with an oil film thickness controlled within 0.01-0.02mm, and let it stand for 3-5 minutes to ensure uniform distribution of the oil film.

[0019] As a further improvement, step S3 includes:

[0020] Put the processed embossing blank into the embossing equipment, confirm that the inner diameter of the embossing blank and the embossing punch positioning ring form a 0.05mm interference fit, and verify that the center of the embossing punch and the center of the cylindrical blank remain concentric, with a deviation of ≤0.02mm.

[0021] As a further improvement, step S4 includes:

[0022] According to the material thickness, set the preset pressure value, control the punching speed to be 20-30mm / s, ensure the uniform flow of the material, monitor the material outflow, and when the outflow material reaches the preset degree, prevent the material from further outflow by the reaction force of the embossing punch positioning ring.

[0023] As a further improvement, it further includes step S6: detecting the formed pattern by a quality detection assembly, with no less than 20 petals as sampling points, measuring the petal surface profile and R angle size, to ensure that the petal surface profile is within 0.015mm, the total pattern surface profile is within 0.04mm, and the pattern R angle is R0.5±0.5mm.

[0024] A high-precision metal sheet belt wheel pattern forming equipment, comprising: a base frame assembly, a blank pretreatment assembly, a precise positioning assembly, an embossing forming assembly, and a quality detection assembly;

[0025] The base frame assembly includes a high-rigidity bed body and a work platform, and the blank pretreatment assembly includes a plurality of groups of spray heads arranged on the work platform in a lifting manner, and a reversible wiping mechanism arranged on one side of the workbench;

[0026] The embossing forming assembly includes an upper module, a pattern petal tab arranged below the upper module, and a lower module installed in the middle of the workbench;

[0027] The precise positioning assembly includes an embossing punch positioning ring arranged in the middle below the upper module, a positioning block arranged in the middle above the lower module, and a guide mechanism for controlling the vertical movement of the upper module, the embossing blank is placed on the work platform, the positioning block is inserted into the middle below the embossing blank, and during embossing, the embossing punch positioning ring is inserted into the middle above the embossing blank, and the pattern petal tab extrudes the upper surface of the embossing blank;

[0028] The precise positioning assembly and the embossing forming assembly work together to ensure the concentricity of the center of the embossing blank and the center of the pattern petal contour through the embossing punch positioning ring, forcing the material to flow uniformly outward during the embossing process, when the outflow material reaches the preset degree, the embossing surface outflow material flow is prevented from further outflow by the increased reaction force of the embossing punch positioning ring, ensuring that the embossing petal surface is full and compact;

[0029] By allowing the bit flower groove to accommodate excess material according to the embossed surface material thickness, reducing the embossed surface forming rebound, realizing the high-precision embossed surface forming of petal surface profile within 0.015mm, total embossed surface profile within 0.04mm, and embossed R angle R0.5±0.5mm.

[0030] As a further improvement, the blank pretreatment assembly comprises a ring groove arranged on the work platform, a ring body embedded in the inside of the ring groove, a first electric guide rod controlling the lifting of the ring body, and a spray head embedded with a plurality of the inside of the ring body, and the spray opening of the spray head is arranged on the inside of the ring body.

[0031] As a further improvement, the wiping mechanism comprises a scrubbing assembly rotatably installed on one side of the work platform, the scrubbing assembly comprising a second electric guide rod rotatably installed on one side of the work platform, a fixed plate fixedly installed on the top end of the electric guide rod, a scrubbing disc rotatably arranged on the side of the fixed plate facing the work platform, and a first motor driving the scrubbing disc to rotate, a second motor installed below the side of the work platform, and the second motor driving the second electric guide rod to rotate.

[0032] As a further improvement, the surface of the scrubbing disc is spirally installed with a support strip from inside to outside, the outer surface of the support strip is coated with an absorbing sheet, and the outer surface of the absorbing sheet is coated with a scrubbing cloth, the support strip is made of silica gel material, the absorbing sheet is made of sponge material, and the scrubbing cloth is made of non-woven fabric material.

[0033] The spiral installation direction of the support strip is consistent with the rotation direction of the scrubbing disc, and the oil on the upper surface of the embossed blank can be wiped from inside to outside.

[0034] The beneficial effects of the present application are:

[0035] The present application realizes a systematic processing scheme through a process-equipment collaborative mechanism. By accurately setting the center hole diameter to be 0.39 times the diameter of the petal profile edge, the radial stress of the blank is uniformly distributed, the material thickness fluctuation caused by uneven stress is eliminated, and the material outflow rate is stably controlled within the process critical point. The surface treatment link adopts directional oil film control: the embossed surface is thoroughly cleaned by the wiping mechanism, and the non-woven fabric coated scrubbing disc is spirally wiped from inside to outside, ensuring that there is no stretching oil residue; at the same time, the blank pretreatment assembly forms a uniform oil film on the outer diameter of the cylinder through the lifting of the ring body and the inside spray head, accurately regulates the material flow characteristics, and avoids the accumulation or thinning caused by traditional uneven coating.

[0036] The precision positioning assembly ensures the absolute concentricity of the blank and the embossing die by the 0.05mm interference fit between the embossing die positioning ring and the positioning block under the closed-loop control driving of the guide mechanism servo hydraulic cylinder and the proportional flow valve. In the embossing forming stage, the embossing die positioning ring counterforce increases suddenly when the pattern petal protrusion extrudes the blank and the material uniformly flows out to the critical point, which instantly locks the excessive outflow and ensures the full and compact petal surface. The lower module integrated let-go flower groove dynamically matches the thickness difference of long and short patterns, orderly contains the excess material, reduces the forming rebound stress by more than 40%, and directly realizes the strict tolerance of petal surface profile ≤0.015mm, total profile ≤0.04mm and R angle R0.5±0.5mm.

[0037] In addition, in view of the systematic defects of the existing equipment that the center hole diameter out of control leads to material flow instability, positioning deviation and profile rebound, the integrated design precisely cuts off the flow instability-forming rebound-profile out-of-tolerance causal chain, and realizes high-precision forming of petal surface profile ≤0.015mm, total profile ≤0.04mm and R angle R0.5±0.5mm.

[0038] In order to completely solve the center hole diameter out of control and material flow instability, it is required that the center hole diameter of the blank prepared in the previous process is accurately controlled to be 0.39 times the diameter of the petal profile edge, so as to ensure that the blank cylinder inner diameter and the embossing die positioning ring and the positioning block of the precision positioning assembly form a 0.05mm interference fit.

[0039] Forcing the blank center to be concentric with the pattern profile eliminates the uneven radial stress caused by eccentricity;

[0040] At the same time, the blank pretreatment assembly completely removes the embossed surface stretching oil residue by the lifting spray head, and uses the reversible wiping mechanism to only apply the stretching oil on the outer diameter of the cylinder, accurately controls the material outflow rate, and avoids the flow instability caused by thickness fluctuation (0.9-1.1 times the thickness of the raw material).

[0041] During the embossing forming process, the upper module vertically presses down under the control of the guide mechanism, the embossing die positioning ring and the positioning block are synchronously inserted into the blank cylinder, and the 0.05mm interference fit ensures the concentricity ≤0.01mm. When the pattern petal protrusion extrudes the blank, the material uniformly flows out to the critical point, the embossing die positioning ring counterforce increases suddenly, which instantly suppresses the excessive outflow, ensures the full and compact petal surface, and eliminates the material accumulation or thinning caused by the positioning looseness of the existing equipment.

[0042] Through the lower module integrated let-go flower groove, its die surface accurately matches the long and short pattern profile, and dynamically contains the excess material of the embossed surface thickness unevenness. This design reduces the forming rebound stress by more than 40% through the orderly material diversion, ensures the petal profile within 0.015mm, accurately forms the R angle in the R0.5±0.5 tolerance band, and completely solves the profile distortion caused by insufficient let-go of the existing technology.

[0043] The embossed blank is placed on the working platform, the blank pretreatment assembly is started, the nozzle lifting sprays the cleaner to remove the embossed surface oil, and the wiping mechanism is turned over to only apply the drawing oil on the outer diameter of the cylinder. The blank is lowered to the positioning block, the upper module is lowered to make the embossed male die positioning ring inserted above the blank, and the 0.05mm interference fit automatically corrects the concentricity. The upper module continues to press down, the pattern petal tab extrudes the blank, and the material flows out uniformly; when the outflow reaches the critical point, the embossed male die positioning ring reacts to lock the outflow, and the displacement flower groove synchronously absorbs the excess material. The quality detection assembly scans the pattern profile in real time, feeds back data to the control system, and ensures that the R angle and profile meet the standard.

[0044] By the center hole diameter, material thickness, surface treatment, positioning accuracy and displacement design, the cause and effect chain of flow instability-forming rebound-profile out-of-tolerance is solved, so that the high-precision pattern forming meets the 0.015mm profile and R angle tolerance requirements, and the product qualification rate is improved. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0046] Figure 1 is a step diagram of a high-precision metal plate belt wheel pattern forming method of the present application.

[0047] Figure 2 is a three-dimensional structure schematic diagram of a high-precision metal plate belt wheel pattern forming equipment of the present application.

[0048] Figure 3 is a local enlarged structure schematic diagram of a high-precision metal plate belt wheel pattern forming equipment of the present application.

[0049] Figure 4 is a front view structure schematic diagram of a high-precision metal plate belt wheel pattern forming method and equipment of the present application.

[0050] Figure 5 is Figure 3 is a structure schematic diagram of the ring body in the enlarged part in the raised state.

[0051] Figure 6 is a structure schematic diagram of the support strip, the absorbing sheet and the scouring cloth section of the bottom of the scouring plate and the local enlargement of the present application.

[0052] Figure 7 is a structure schematic diagram of an embossed forming assembly of the present application.

[0053] Figure 8 is a long and short flower pattern cylindrical workpiece structure schematic diagram of the present application.

[0054] Figure 9 is a uniform flower pattern cylindrical workpiece structure schematic diagram of the present application.

[0055] Figure 10 is a module connection diagram of a high-precision metal plate belt wheel flower forming equipment of the present application.

[0056] 1, base frame assembly; 2, blank pretreatment assembly; 3, accurate positioning assembly; 4, embossing forming assembly; 5, quality detection assembly; 6, embossed blank; 7, control module; 8, limiting module; 9, oil injection module;

[0057] 11, high-rigidity bed; 12, work platform;

[0058] 21, spray head; 22, ring groove; 23, ring body; 24, first electric guide rod; 25, second electric guide rod; 26, fixed plate; 27, scrubbing disc; 28, first motor; 29, second motor; 271, support strip; 272, absorbent sheet; 273, scrubbing cloth;

[0059] 31, embossing punch positioning ring; 32, positioning block; 33, hydraulic press; 34, output head;

[0060] 41, upper module; 42, flower petal tab; 43, lower module; 51, conveyor belt; 52, arched frame; 53, detection sensor;

[0061] 61, long and short flower pattern cylindrical workpiece; 62, uniform flower pattern cylindrical workpiece; 63, let go of the flower groove. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0063] In the description of the present application, the terms first, second are for the purpose of description only and can not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with first, second can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of multiple is two or more, unless otherwise specifically limited.

[0064] Referring to Figure 1 As shown in the drawings, a high-precision metal plate belt wheel pattern forming method, the steps include:

[0065] S1. Prepare the embossed blank by the front stamping process, control the center hole diameter of the embossed blank to be 0.39 times the diameter of the pattern petal contour edge, and the material thickness of the embossed surface of the embossed blank is 0.9-1.1 times the thickness of the raw material;

[0066] Wherein, the raw material refers to the unprocessed metal plate, in the front stamping process, the metal plate is stamped into a cylindrical blank, during this process, due to the flow and deformation of the material, the material thickness of the embossed surface will change slightly from the thickness of the original metal plate, but it must be strictly controlled within the range of 0.9-1.1 times the thickness of the original plate.

[0067] S2. Clean the embossed surface of the embossed blank by the surface treatment unit to ensure that the embossed surface is free of stretch oil residue, and at the same time, only the stretch oil is applied on the outer diameter surface of the embossed blank 6 to control the flow characteristics of the material during the embossing process;

[0068] S3. Position the treated embossed blank on the workbench 12 through the precise positioning assembly 3, so that the inner diameter of the embossed blank 6 forms a 0.05mm interference fit with the embossing punch positioning ring 31, ensuring that the center of the embossing punch is concentric with the center of the cylindrical blank;

[0069] S4. Implement the embossing process by the embossing forming assembly 4, control the material outflow by the reaction force of the embossing punch positioning ring 31, and stop further outflow when the material outflow reaches an appropriate degree, to ensure that the embossed petal surface is full and firm;

[0070] Wherein, control the embossing punch to move downward to extrude the blank material, so that the material flows uniformly outward under the action of the embossing punch, when the material outflow reaches the critical point, the reaction force generated by the embossing punch positioning ring 31 increases and prevents the material from further outflow, forming the initial pattern contour, while controlling the embossing depth and pressure distribution to ensure the initial forming of the R angle at the top and bottom of the pattern;

[0071] S5. Through the controlled embossing surface material thickness of the long and short pattern, through the relief groove 63 between the pattern petals of the upper mold 41, accommodate the excess material, the relief long and short groove on the upper mold 41 corresponds to the workpiece pattern long and short flower shape, facilitate the excess material flow to the relief groove, reduce the pattern surface forming rebound, finally realize the petal surface profile 0.015mm, total pattern surface profile 0.04mm, pattern R angle R0.5±0.5mm high precision pattern forming.

[0072] The existing equipment causes the flow instability-forming rebound-profile out-of-tolerance causal chain due to the center hole diameter out of control, material thickness fluctuation, surface treatment failure, positioning deviation and insufficient relief.

[0073] Through the process-equipment collaborative mechanism to achieve systematic eradication. The core is to accurately set the center hole diameter to 0.39 times the diameter of the petal profile edge, to force the uniform distribution of the blank radial stress, to eliminate the material thickness fluctuation caused by uneven stress, and to strictly control the material thickness within 0.9-1.1 times of the original material thickness, so as to stabilize the material outflow rate within the process critical point. The surface treatment link adopts directional oil film control: the embossed surface is thoroughly cleaned by the wiping mechanism, and is wiped by the non-woven cloth covering the scrubbing disc 27 from the inside to the outside in a spiral manner, to ensure that there is no stretching oil residue;

[0074] At the same time, the blank pretreatment assembly 2 is lifted by the ring body 23 and the inner side nozzle 21, only a uniform oil film is formed on the outer diameter of the cylinder, the material flow characteristics are accurately controlled, and the accumulation or thinning caused by traditional uneven coating is avoided.

[0075] The precise positioning assembly 3 is in 0.05mm interference fit with the positioning block 32 through the embossing punch positioning ring 31, and is driven by the closed-loop control of the servo hydraulic cylinder and the proportional flow valve of the guide mechanism, to ensure that the blank and the punch are absolutely concentric when the upper mold 41 is vertically pressed. During the embossing forming stage, the pattern petal tab 42 extrudes the blank, and the material uniformly flows to the critical point, the reaction force of the embossing punch positioning ring 31 increases suddenly, and the excessive outflow is immediately locked, to ensure that the petal surface is full and compact; the lower mold 43 integrates the relief groove to dynamically match the thickness difference of the long and short pattern, and orderly accommodates the excess material, to reduce the forming rebound stress by more than 40%, and directly realize the strict tolerance of the petal surface profile ≤0.015mm, the total profile ≤0.04mm and the R angle R0.5±0.5mm.

[0076] The center hole diameter and the material thickness are controlled according to S1 through the previous process; the embossed blank is placed on the workbench 12, the wiping mechanism rotates the scrubbing disc 27 to remove the embossed surface oil, and the blank pretreatment assembly 2 lowers the ring body 23 to direct the outer diameter oil film.

[0077] The blank is placed on the positioning block 32, and the upper module 41 is vertically pressed under the drive of the hydraulic machine 33, and the embossing punch positioning ring 31 is in an interference fit of 0.05 mm with the blank; when the pattern petal protrusion 42 is extruded, the material flows out to the critical point and is inhibited by the reaction force of the positioning ring, and the accommodation groove synchronously absorbs the excess material.

[0078] The conveyor belt 51 transports the workpiece, and the laser profile instrument detects the profile and R angle in real time, and the data is fed back to the control system to remove abnormal products.

[0079] This process completely cuts off the vicious cycle of center hole out-of-control-material thickness fluctuation-external flow instability-positioning deviation-profile out-of-tolerance, improves the material flow control accuracy by 50%, and ensures that the yield of high-value-added products is stable at more than 98%.

[0080] The concentricity error is controlled within 0.01 mm through the interference fit of 0.05 mm and the reaction force mechanism, and the stress release effect of the accommodation groove makes the petal surface profile stable within 0.015 mm (6 times better than ISO 10099 standard), and the R angle tolerance is compressed to R0.5±0.5, completely avoiding the size failure caused by positioning drift and rebound in the prior art.

[0081] By accurately controlling the directional oil film and the material thickness, the flow interference is eliminated, and the single-piece forming cycle is shortened by 20%; the high-rigidity bed body 11 and the hydraulic closed-loop system suppress vibration, so that high-precision patterns can be mass-produced in high-end transmission components such as new energy vehicles without manual intervention.

[0082] Compared with the prior art, the extensive reform logic of the general platform is abandoned, and a three-in-one mechanism of stress homogenization-flow precision-rebound suppression is used to convert multi-link defects into controllable process chains to meet the industry bottleneck demand of 0.015 mm profile.

[0083] Step S1 includes:

[0084] S11. Measure the diameter of the profile petal profile edge, which is usually 42.1 mm;

[0085] S12. Calculate the center hole diameter of the embossed blank: the diameter of the profile petal profile edge × 0.39, for a profile petal profile edge diameter of 42.1 mm, the center hole diameter is 16.5 mm;

[0086] S13. Produce a cylindrical blank through the previous stamping process;

[0087] S14. Strictly control the thickness of the embossed surface end face to be 0.9-1.1 times the thickness of the raw material;

[0088] S15. Ensure that the outer diameter accuracy of the embossed blank 6 is within ±0.02 mm;

[0089] S16. Quality inspection is performed on the finished embossed blank, including measurement of the center hole diameter, the embossed surface material thickness, and the outer diameter of the cylinder.

[0090] In step S12, if the center hole diameter is too large, the flow resistance of the material to the center is small during the stamping process, and both the petal surface profile and the R angle of the pattern are unqualified. If the center hole diameter is too small, the flow resistance of the material to the center is increased, and after the pattern is formed, the rebound amount of the petal surface profile is increased, and the surface profile of the pattern is unqualified.

[0091] In step S14, when the thickness of the raw material is relatively thick, after the pattern is extruded, the stress of the pattern petals is released, and the petals rebound, resulting in unqualified surface profile of the pattern petals. In addition, the stamping and extruding pattern mold is under large stress, and the mold life is low. When the thickness of the raw material is relatively thin, the volume of the material required for forming the pattern is not enough, the R angle at the top of the pattern is not fully formed, the R angle size is out of tolerance, the pattern petals are weak, and the single surface profile and the total surface profile of the pattern petals are unqualified.

[0092] Step S2 includes:

[0093] S21. The embossed surface is thoroughly cleaned using a fiber-free wiping cloth to ensure that there is no oil film residue.

[0094] S22. Stretching oil is uniformly applied only on the surface of the outer diameter of the cylinder, and the thickness of the oil film is controlled within the range of 0.01-0.02 mm.

[0095] S23. Let stand for 3-5 minutes to allow the oil film to be evenly distributed.

[0096] In step S21, when there is a stretching oil film on the embossed surface of the blank, the friction coefficient between the embossing punch and the extruded material will be reduced during the forming process, the radial flow resistance of the material along the embossed surface is small, the inward flow of the material is increased, resulting in a weak embossed surface, an unsaturated R angle of the pattern, and unqualified surface profile and R angle.

[0097] Step S3 includes:

[0098] S31. Place the treated embossed blank into the embossing equipment.

[0099] S32. Confirm that the inner diameter of the embossed blank 6 forms a 0.05 mm interference fit with the embossing punch positioning ring 31.

[0100] S33. Verify that the center of the embossing punch is concentric with the center of the cylinder blank, with a deviation of ≤0.02 mm.

[0101] In step S32, the interference amount is 0.05 mm. Too small interference amount is not conducive to providing resistance to prevent material outflow, and too large interference amount will cause the embossing punch positioning ring 31 to be under large tension, the mold life is low, and the rebound amount of the pattern petal surface is increased, resulting in unqualified surface profile.

[0102] Step S4 includes:

[0103] S41. Set the preset pressure value according to the material thickness;

[0104] S42. Control the punching speed to be 20-30 mm / s to ensure uniform material flow;

[0105] S43. Monitor the material outflow, and when the outflow material reaches a preset degree, use the reaction force of the embossing punch positioning ring 31 to prevent further outflow of the material.

[0106] S44: Slowly release the pressure, control the unloading speed to be ≤10 mm / s, use the stretching oil on the outer diameter of the cylinder to assist demolding, and reduce surface damage.

[0107] Step S5 includes:

[0108] S51. Determine whether the embossed surface material thickness exceeds the standard value;

[0109] S52. When the material thickness exceeds the standard value, process a let-out flower groove corresponding to the workpiece pattern on the die surface of the lower die;

[0110] S53. Accurately control the depth of the let-out flower groove to ensure that the excess material can flow smoothly and reduce pattern surface forming rebound.

[0111] In step S52, the let-out flower groove is for long and short pattern forming, and the mold let-out long and short flower grooves correspond to the long and short flower shapes of the workpiece pattern.

[0112] S6: Detect the formed pattern by the quality detection assembly 5, the sampling points are not less than 20 petals, measure the petal surface profile and R angle size, to ensure that the petal surface profile is within 0.015 mm, the total pattern surface profile is within 0.04 mm, and the pattern R angle is R0.5±0.5 mm.

[0113] Referring to Figures 2-10 Fig. 1, a high-precision metal sheet belt wheel pattern forming equipment includes a base frame assembly 1, a blank pretreatment assembly 2, a precise positioning assembly 3, an embossing forming assembly 4, and a quality detection assembly 5.

[0114] The base frame assembly 1 includes a high-rigidity bed body 11 and a workbench 12, and the blank pretreatment assembly 2 includes a plurality of groups of spray heads 21 raised on the workbench 12, and a reversible wiping mechanism arranged on one side of the workbench.

[0115] The embossing forming assembly 4 includes an upper die block 41, a pattern petal tab 42 arranged below the upper die block 41, and a lower die block 43 installed in the middle of the workbench.

[0116] The precision positioning assembly 3 includes an embossing punch positioning ring 31 arranged in the middle below the upper module 41, a positioning block 32 arranged in the middle above the lower module 43, and a guide mechanism for controlling the vertical movement of the upper module 41. The working platform 12 is placed with the embossing blank 6, and the positioning block 32 is inserted into the middle below the embossing blank 6. During embossing forming, the embossing punch positioning ring 31 is inserted into the middle above the embossing blank 6, and the pattern petal tab 42 extrudes the upper surface of the embossing blank 6.

[0117] The outer diameter of the embossing punch positioning ring 31 and the positioning block 32 is 0.05mm larger than the inner diameter of the embossing blank 6.

[0118] The precision positioning assembly 3 and the embossing forming assembly 4 work together to ensure the concentricity of the center of the embossing blank and the center of the pattern petal contour through the embossing punch positioning ring 31, forcing the embossing process to extrude the material uniformly outward. When the outflow material reaches the preset degree, the outflow of the material is prevented by the increased reaction force of the embossing punch positioning ring 31, ensuring that the embossing petal surface is full and firm.

[0119] By allowing the displacement groove to accommodate excess material according to the thickness of the embossed surface material, the pattern surface forming rebound is reduced.

[0120] Thus, high-precision pattern forming is achieved with a petal surface contour of 0.015mm, a total pattern surface contour of 0.04mm, and a pattern R angle of R0.5±0.5mm.

[0121] The finished embossing blank 6 includes long and short pattern cylindrical workpieces or uniform pattern cylindrical workpieces.

[0122] To address the systematic defects of existing equipment caused by out-of-control center hole diameter, material flow instability, positioning deviation, and contour rebound, the integrated design precisely cuts off the causal chain of flow instability-forming rebound-contour out-of-tolerance, achieving high-precision forming with a petal surface contour of ≤0.015mm, a total contour of ≤0.04mm, and a R angle of R0.5±0.5mm.

[0123] To completely eliminate the out-of-control center hole diameter and material flow instability, the center hole diameter is accurately controlled to be 0.39 times the diameter of the petal contour edge when preparing the blank in the previous process, ensuring that the inner diameter of the blank cylinder and the embossing punch positioning ring 31 and the positioning block 32 of the precision positioning assembly 3 form a 0.05mm interference fit.

[0124] Forcing the blank center to be concentric with the pattern contour eliminates uneven radial stress caused by eccentricity.

[0125] Meanwhile, the blank pretreatment assembly 2 thoroughly removes the embossed surface stretch oil residue through the lifting spray head 21 and uses the reversible wiping mechanism to only apply the stretch oil on the outer diameter of the cylinder, accurately controls the material outflow rate, and avoids the flow instability caused by thickness fluctuations (0.9-1.1 times the thickness of the raw material).

[0126] During the embossing forming process, the upper module 41 is vertically pressed down under the control of the guide mechanism, the embossing punch positioning ring 31 is inserted into the blank cylinder synchronously with the positioning block 32, and the 0.05mm interference fit ensures the concentricity ≤0.01mm. When the embossing petal protrusions 42 extrude the blank, the material uniformly flows out to the critical point, the reaction force of the embossing punch positioning ring 31 suddenly increases, which instantly suppresses excessive outflow, guarantees the fullness and tightness of the petal surface, and eliminates the material accumulation or thinning caused by loose positioning of the existing equipment.

[0127] The lower module 43 is integrated with a let-go flower groove, the die surface of which accurately matches the long and short embossing pattern profile, dynamically accommodating the excess material of the embossed surface thickness. This design reduces the forming rebound stress by more than 40% through orderly material distribution, ensures that the petal profile is stable within 0.015mm, accurately shapes the R angle within the R0.5±0.5 tolerance band, and completely solves the profile distortion caused by insufficient let-go of the existing technology.

[0128] The embossed blank is placed on the work platform 12, the blank pretreatment assembly 2 is started, the spray head 21 sprays cleaning agent to remove the embossed surface oil, and the wiping mechanism is reversed to only apply stretch oil on the outer diameter of the cylinder.

[0129] The blank is lowered to the positioning block 32, the upper module 41 is lowered to make the embossing punch positioning ring 31 inserted into the blank above, and the 0.05mm interference fit automatically corrects the concentricity.

[0130] The upper module 41 continues to press down, the embossing petal protrusions 42 extrude the blank, and the material uniformly flows out; when the outflow reaches the critical point, the reaction force of the embossing punch positioning ring 31 locks the outflow, and the let-go flower groove synchronously absorbs the excess material.

[0131] The quality detection assembly 5 scans the embossing pattern profile in real time, feeds back data to the control system, and ensures that the R angle and profile meet the standard.

[0132] Through the breakthrough of the precise positioning-controllable flow-dynamic let-go trinity design, the material outflow control precision is improved by 50% through the interference fit and reaction force mechanism, the chain reaction of flow instability is eliminated, and the yield of high value-added products is improved to more than 98% (the yield of existing equipment is generally <85%).

[0133] The let-go flower groove and thickness adaptation design suppresses the forming rebound within 0.005mm, directly meets the ISO 10099 tolerance standard, and breaks through the 0.05mm bottleneck in the industry.

[0134] The vibration is inhibited by the high-rigidity base frame 11, the blank pre-treatment and the embossing forming assembly 4 are linked, the manual intervention is reduced, the single-piece forming cycle is shortened by 20%, and the device is suitable for mass production of high-end transmission parts of new energy vehicles.

[0135] The existing device lacks central hole cooperative control, surface treatment orientation and dynamic displacement ability, resulting in uncontrollable material flow and positioning drift, forming a vicious cycle.

[0136] Through the 0.05mm interference fit of the precise positioning assembly 3, the critical reaction force mechanism of the embossing punch positioning ring 31 and the intelligent shunting of the displacement flower groove, the multi-link problem is converted into a systematic solution, not only eliminating profile tolerance and R angle failure, but also improving comprehensive precision by more than 3 times.

[0137] The blank pre-treatment assembly 2 comprises a ring groove 22 arranged on the working platform 12, a ring body 23 embedded in the ring groove 22, a first electric guide rod 24 for controlling the lifting of the ring body 23, and a plurality of ring bodies 23 embedded in the ring groove 22. The spray head 21 is embedded in the ring body 23, and the spray opening of the spray head 21 is arranged on the inner side of the ring body 23. The ring body 23, the first electric guide rod 24 and the spray head 21 are matched to spray oil film on the outer surface of the embossed blank 6.

[0138] The blank pre-treatment assembly 2 adopts the integrated structure of the ring groove 22, the ring body 23 and the first electric guide rod 24, which aims to solve the material flow instability problem caused by inaccurate stretching oil application of the existing device.

[0139] In the traditional process, the stretching oil is easily left on the embossed surface or the outer diameter is not evenly coated, which interferes with the uniform outflow of the material during the embossing process, causing the petal profile tolerance to be out of tolerance and the R angle to be deformed. The ring body 23 is embedded in the ring groove 22 of the working platform 12, and the first electric guide rod 24 drives the lifting of the ring body 23, so that the spray opening of the embedded spray head 21 in the ring body 23 is accurately aligned with the outer surface of the embossed blank 6.

[0140] When operating, the ring body 23 is lowered to the height of the blank outer diameter, the spray head 21 sprays the stretching oil film from the inner side, only covering the outer surface of the cylinder, avoiding the contact of the oil with the embossed surface;

[0141] Then the ring body 23 is raised and reset. This mechanism ensures that there is no oil left on the embossed surface (in combination with the cleaning step in the early stage), and the thickness of the oil film on the outer diameter is uniform and controllable, strictly limiting the material flow range.

[0142] Further, by improving the stretching oil application accuracy to the micron level, the radial stress fluctuation caused by oil film interference is eliminated, the material outflow rate is stabilized within the critical point required by the process, and the petal surface profile tolerance ≤0.015mm is directly supported for high-precision forming, avoiding the profile rebound and size failure caused by the application deviation in the prior art.

[0143] The wiping mechanism comprises a scrubbing assembly rotatably mounted on one side of the working platform 12, the scrubbing assembly comprising a second electric guide rod 25 rotatably mounted on one side of the working platform 12, a fixed plate 26 fixedly mounted on the top end of the electric guide rod, a scrubbing disc 27 rotatably arranged on the side of the fixed plate 26 facing the working platform 12, and a first motor 28 driving the scrubbing disc 27 to rotate, a second motor 29 mounted below the side of the working platform 12, the second motor 29 driving the second electric guide rod 25 to rotate.

[0144] The surface of the scrubbing disc 27 is spirally provided with a support strip 271, the outer surface of the support strip 271 is covered with an absorbing sheet 272, and the outer surface of the absorbing sheet 272 is covered with a scrubbing cloth 273, the support strip 271 is made of silica gel material, the absorbing sheet 272 is made of sponge material, and the scrubbing cloth 273 is made of non-woven fabric material.

[0145] The spiral installation direction of the support strip 271 is consistent with the rotation direction of the scrubbing disc 27, and the oil on the upper surface of the embossing blank 6 can be wiped from the inside to the outside.

[0146] The wiping mechanism solves the problem of material flow interference caused by residual oil on the embossed surface by the cooperation of the second electric guide rod 25 and the rotating scrubbing disc 27.

[0147] The traditional cleaning method is prone to residual oil film or surface damage due to disordered wiping direction or insufficient material adaptation, which causes material outflow rate fluctuation during the embossing process, resulting in petal profile tolerance and R angle deformation.

[0148] By adopting the second motor 29 to drive the second electric guide rod 25 to rotate, the scrubbing assembly is accurately positioned above the embossing blank 6; after the first motor 28 is started, the scrubbing disc 27 rotates at high speed in the spiral direction, the silica gel support strip 271 of the scrubbing disc 27 (the spiral direction is consistent with the rotation direction) guides the oil stains on the embossed surface to migrate from the inside to the outside, the sponge absorbing sheet 272 efficiently absorbs the residual oil, and the non-woven scrubbing cloth 273 realizes traceless cleaning.

[0149] During operation, the scrubbing disc 27 lightly presses the upper surface of the blank, and the oil stains are systematically guided out to the edge during rotation, ensuring that the embossed surface is absolutely free of oil residues and avoiding surface scratches. This mechanism improves the cleaning accuracy to the micron level, eliminates the interference of oil stains on the radial stress of the material, makes the material outflow rate stable and controllable during the embossing process, directly guarantees the forming requirement that the petal surface profile is ≤0.015 mm, and avoids the risk of profile rebound and size failure caused by cleaning failure in the prior art.

[0150] The quality detection assembly 5 includes a conveying belt 51 installed on one side of the work platform 12, an arch-shaped frame 52 installed on the high-rigidity bed body 11 above the conveying belt 51, and a detection sensor 53 arranged in the middle below the arch-shaped frame 52, which detects the embossed surface of the embossed blank 6 on the conveying belt 51.

[0151] The guiding mechanism includes a hydraulic machine 33 installed on the high-rigidity bed body 11 and an output head 34 installed at the output end of the hydraulic machine 33, and the upper mold module 41 is fixedly installed below the output head 34 and moves up and down under the control of the hydraulic machine 33.

[0152] The detection sensor 53 of the quality detection assembly 5 can adopt a high-precision laser profiler or a machine vision system. The laser profiler obtains three-dimensional topographic data of the embossed surface in real time through non-contact scanning, and the measurement accuracy reaches ±0.005 mm, directly verifying the compliance of petal profile ≤0.015 mm and R angle R0.5±0.5 mm;

[0153] The machine vision system utilizes a high-resolution industrial camera and a sub-pixel level image processing algorithm to dynamically identify surface oil residue and profile distortion. Both are integrated below the arch-shaped frame 52 and move synchronously with the conveying belt 51 to complete online detection, ensuring that unqualified products are immediately rejected and avoiding the problem of profile rebound caused by flow instability.

[0154] The hydraulic machine 33 of the guiding mechanism is composed of a servo hydraulic cylinder, a proportional flow valve, and a closed-loop pressure control system. The servo hydraulic cylinder provides high-rigidity thrust in the vertical direction, the proportional flow valve accurately controls the oil flow rate to realize micron-level control of the lifting speed of the upper mold module 41 (±0.01 mm positioning accuracy), and the closed-loop system compensates for load fluctuations in real time to ensure the stability of the 0.05 mm interference fit between the embossing punch positioning ring 31 and the blank cylinder. This mechanism effectively suppresses the vibration interference of traditional mechanical guiding and ensures the precise triggering of the reaction force at the material outflow critical point.

[0155] The above-mentioned sensors and hydraulic systems are mature technologies in the industrial field, and their selection and parameter configuration follow the ISO10099 and JIS B 6402 standards, so there is no need to describe the specific implementation details.

[0156] The control module 7, the limiting module 8, and the oil injection module 9 are electrically connected with the first motor 28, the second motor 29, the electric guide rod, the limiting module 8, the first electric guide rod 24, the second electric guide rod 25, the oil injection module 9, and the hydraulic machine 33.

[0157] The limiting module 8 is integrated in the motion control system, and the key components are monitored in real time by high-precision displacement sensors and electronic limiting switches. In the lifting stage of the ring body 23, the limiting module 8 sets a 0.05mm threshold to ensure that the ring body 23 is accurately positioned to the height of the blank outer diameter, avoiding overtravel of the lifting to cause oil film spraying deviation; during the descent of the scrubbing disc 27, the module monitors the vertical displacement of the fixed plate 26, limiting the descent depth to 0.1mm to prevent the scrubbing cloth 273 from excessive compression and damage to the embossed surface; when the upper module 41 is pressed down, the limiting module 8 is linked with the hydraulic machine 33 to accurately control the embossing depth to the R angle forming critical point (0.5±0.02mm), and lock the pressure holding time, eliminating the petal contour distortion caused by out-of-control travel. This module suppresses mechanical motion error within ±0.01mm, providing a basic guarantee for 0.05mm interference fit and 0.015mm contour accuracy.

[0158] The oil spraying module 9 adopts a closed-loop pressure control system composed of a proportional flow valve and a micro pressure sensor, which dynamically adjusts the oil spraying amount (0.15-0.25ml / cm2) and the oil spraying pressure (0.3-0.4MPa).

[0159] The module controls the response time of the spray head 21 to be ≤5ms through the electromagnetic valve to ensure that the stretching oil is only sprayed on the outer diameter surface of the cylinder to form a 0.02mm thick oil film. This precise control eliminates oil film thickness fluctuations (±0.005mm) and strictly limits the material outflow rate within the critical range of the process, avoiding the phenomenon of material accumulation or insufficient oil caused by oil overload, which directly supports the forming requirement of petal surface contour ≤0.015mm. The module cooperates with the limiting mechanism to realize micron-level stability in the surface treatment link, and solves the flow instability problem caused by oil film interference in the prior art.

[0160] The embossed blank 6 is placed on the workbench and positioned with the positioning block 32, and the ring body 23 is lifted through the control module 7 and the first electric guide rod 24 to cooperate with the oil spraying module 9 to spray oil film on the outer ring surface of the embossed blank 6, and then reset. The oil spraying module 9 mainly controls the oil spraying amount and the oil spraying pressure, and the opening and closing of the spray head 21 is controlled by the control module 7. The opening and closing function is realized by setting the electromagnetic valve, which is a prior art and will not be described in detail.

[0161] After the embossed blank 6 is sprayed with oil film on the outer ring surface, the control module 7 cooperates with the second motor 29 to control the second electric guide rod 25 to rotate 90°, and the fixed plate 26 is lowered by the second electric guide rod 25 to make the scrubbing cloth 273 contact the upper surface of the embossed blank 6, and the scrubbing disc 27 is driven to rotate and scrub by the first motor 28, and then reset.

[0162] Through cooperation of the control module 7 and the hydraulic machine 33, the upper die module 41 is controlled to move downward to the lower die module 43, the embossing punch positioning ring 31 is positioned in the middle of the embossing blank 6 for secondary positioning, then the pattern petal tab 42 extrudes and forms the embossing blank 6 on the upper surface of the embossing surface, and the pressure is maintained for a preset time, and then reset.

[0163] The embossing blank 6 is placed on the conveying belt 51 and passes through the detection sensor 53 to complete acceptance.

[0164] The embossing punch positioning ring 31 is made of Cr12MoV die steel, and the heat treatment hardness is HRC 58-60, the inner diameter tolerance is controlled within -0.005~0mm, the surface roughness is Ra 0.2μm, and the precise 0.05mm interference fit is formed with the outer diameter of the embossing blank 6.

[0165] It should be noted that the device structure and the drawings of the present application mainly describe the principles of the present application, and the power mechanism, power supply system and control system of the device are not fully described in the design principle technology, and the specific power mechanism, power supply system and control system can be clearly known by the technical personnel in the field under the premise of understanding the principles of the above application, the control mode of the application file is automatically controlled by the controller, and the control circuit of the controller can be realized by simple programming of the technical personnel in the field;

[0166] The standard parts used can be purchased from the market, and can be ordered according to the description and drawings, and the specific connection mode of each part adopts the conventional screw, rivet, welding and other conventional means in the prior art, the mechanical parts and equipment adopt the conventional type in the prior art, and the components known by the technical personnel in the field are known or obtained by conventional experimental methods.

[0167] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for forming a belt pulley pattern from sheet metal with high precision, characterized in that, The steps include: S1. Prepare the embossed blank (6) by the previous stamping process, control the center hole diameter of the embossed blank (6) to be 0.39 times the diameter of the pattern petal contour edge, and the embossed surface material thickness of the embossed blank (6) to be 0.9-1.1 times the thickness of the raw material; S2. Apply stretching oil to the outer diameter surface of the embossed blank (6), and clean the embossed surface of the embossed blank (6) by the surface treatment unit; S3. Position the treated embossed blank (6) on the workbench by the precise positioning assembly (3), so that the inner diameter of the embossed blank (6) forms a 0.05mm interference fit with the embossing punch positioning ring (31), and ensure that the center of the embossing punch and the center of the embossed blank (6) are concentric; S4. Implement the embossing process by the embossing forming assembly (4), control the material outflow by the reaction force of the embossing punch positioning ring (31), and stop further outflow when the material outflow reaches an appropriate degree, to ensure that the embossed petal surface is full and firm; S5. Refine the preliminary pattern through the accommodation flower groove (63) between the pattern petal tabs in the upper module (41), when the embossed surface material thickness is thicker, the excess material flows into the accommodation flower groove (63) corresponding to the length and short flower shape of the workpiece pattern, reducing the material rebound effect, while controlling the holding pressure time and unloading speed, so that the pattern reaches the final stable state after elastic recovery, forming a high-precision belt pulley pattern finished product with a petal surface contour of 0.015mm, a total pattern surface contour of 0.04mm, and a pattern R angle of R0.5±0.5mm.

2. The method of claim 1, wherein the method is a high-precision pattern forming method for a belt pulley made of sheet metal. Step S1 includes: Control the embossed surface end face thickness to be 0.9-1.1 times the thickness of the raw material, ensure that the outer diameter accuracy of the embossed blank (6) is within ±0.02mm, and perform quality inspection on the prepared embossed blank (6), including measurement of the center hole diameter, embossed surface material thickness and cylinder outer diameter.

3. The high-precision sheet metal pulley pattern forming method according to claim 1, characterized in that, Step S2 includes: Use a non-fiber wiping cloth to thoroughly clean the embossed surface, ensuring no oil film residue, and only apply stretching oil evenly on the outer diameter surface of the cylinder, with an oil film thickness controlled within 0.01-0.02mm, and let stand for 3-5 minutes to ensure uniform distribution of the oil film.

4. The method of claim 1, wherein the method is a high-precision pattern forming method for a belt pulley made of sheet metal. Step S3 includes: Place the treated embossed blank (6) into the embossing equipment, confirm that the inner diameter of the embossed blank (6) forms a 0.05mm interference fit with the embossing punch positioning ring (31), and verify that the center of the embossing punch and the center of the embossed blank (6) are concentric, with a deviation of ≤0.02mm.

5. The method of claim 1, wherein the method is a high-precision pattern forming method for a belt pulley made of sheet metal. Step S4 includes: Set the preset pressure value according to the material thickness, control the stamping speed to be 20-30mm / s, ensure uniform material flow, and monitor the material outflow, when the outflow material reaches the preset degree, stop the material from further outflow by the reaction force of the embossing punch positioning ring (31).

6. The method of claim 1, wherein the method is a high-precision pattern forming method for a belt pulley made of sheet metal. Also includes step S6: detect the formed pattern by the quality detection assembly (5), with no less than 20 petals as sampling points, measure the petal surface contour and R angle size, and ensure that the petal surface contour is within 0.015mm, the total pattern surface contour is within 0.04mm, and the pattern R angle is R0.5±0.5mm.

7. A high-precision sheet metal belt pulley pattern forming apparatus using the high-precision sheet metal belt pulley pattern forming method according to any one of claims 1 to 6, characterized by, Includes: The base frame assembly (1), the blank pretreatment assembly (2), the accurate positioning assembly (3), the embossing forming assembly (4) and the quality detection assembly (5); The base frame assembly (1) comprises a high-rigidity bed body (11) and a work platform (12), and the blank pretreatment assembly (2) comprises a plurality of groups of spray heads (21) arranged on the work platform (12) in a lifting mode, and a reversible wiping mechanism arranged on one side of the workbench. The embossing forming assembly (4) comprises an upper module (41), a pattern petal tab (42) arranged below the upper module (41), and a lower module (43) arranged in the middle of the workbench. The accurate positioning assembly (3) comprises an embossing punch positioning ring (31) arranged in the middle below the upper module (41), a positioning block (32) arranged in the middle above the lower module (43), and a guide mechanism for controlling the vertical movement of the upper module (41), the work platform (12) is arranged with an embossing blank (6), the positioning block (32) is inserted into the middle below the embossing blank (6), and when the embossing is formed, the embossing punch positioning ring (31) is inserted into the middle above the embossing blank (6), and the pattern petal tab (42) extrudes the upper surface of the embossing blank (6); The accurate positioning assembly (3) and the embossing forming assembly (4) work together to ensure the concentricity of the center of the embossing blank (6) and the center of the pattern petal contour by the embossing punch positioning ring (31), so that the upper module (41) extrudes the material to flow outward uniformly during the embossing process, and when the outflow material reaches the preset degree, the outflow of the material is prevented by the increased reaction force of the embossing punch positioning ring (31), so that the petal surface of the embossing is full and compact; By allowing the displacement groove (63) to accommodate the excess material according to the thickness of the embossing surface material, the rebound of the pattern surface forming is reduced, the high-precision pattern forming of the petal surface profile within 0.015mm, the total pattern surface profile within 0.04mm, and the pattern R angle R0.5±0.5mm is realized.

8. A high-precision sheet metal belt wheel pattern forming apparatus according to claim 7, characterized in that, The blank pretreatment assembly (2) comprises a ring groove (22) arranged on the work platform (12), a ring body (23) embedded in the inside of the ring groove (22), a first electric guide rod (24) for controlling the lifting of the ring body (23), and a plurality of ring bodies (23) embedded in the inside of the ring body (23), the nozzle of the spray head (21) is arranged on the inside surface of the ring body (23), and the ring body (23) is matched with the first electric guide rod (24) and the spray head (21) to spray oil film on the outer ring surface of the embossing blank (6).

9. A high-precision sheet metal belt wheel pattern forming apparatus according to claim 8, characterized in that, The wiping mechanism comprises a scrubbing assembly rotatably installed on one side of the working platform (12), the scrubbing assembly comprising a second electric guide rod (25) rotatably installed on one side of the working platform (12), a fixed plate (26) fixedly installed on the top end of the electric guide rod, a scrubbing disc (27) rotatably arranged on the fixed plate (26) towards one side of the working platform (12), and a first motor (28) for driving the scrubbing disc (27) to rotate, and a second motor (29) installed below the side of the working platform (12), the second motor (29) driving the second electric guide rod (25) to rotate.

10. The high-precision metal sheet belt wheel pattern forming apparatus according to claim 9, wherein The surface of the scrubbing disc (27) is spirally provided with a support strip (271) from inside to outside, the outer surface of the support strip (271) is covered with an absorbing sheet (272), and the outer surface of the absorbing sheet (272) is covered with a scrubbing cloth (273), the support strip (271) is made of silica gel material, the absorbing sheet (272) is made of sponge material, and the scrubbing cloth (273) is made of non-woven fabric material; The spiral installation direction of the support strip (271) is consistent with the rotation direction of the scrubbing disc (27), and the oil on the upper surface of the embossed blank (6) can be wiped from inside to outside.

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