Spinning forming method for rope returning wheel of elevator

Abstract

The invention discloses a spinning forming method for an elevator rope returning wheel, which relates to the technical field of elevator part processing and comprises the steps of designing a spinning process, designing a spinning blank, designing a spinning process, spinning forming and inspecting parts. The spinning process sequentially comprises the steps of designing a spinning tire, designing a spinning roller attack angle and a spinning roller shape, designing a spinning roller gap line, designing a spinning track, generating a spinning program and designing spinning parameters, and spinning forming sequentially comprises the steps of spinning machining of a small opening end, spinning machining of a large opening end and eccentric spinning of a rope groove structure. According to the method, the defects of a casting machining process and a welding process can be overcome, the machining period can be greatly shortened, the machining efficiency can be greatly improved, the material can be hardened through spinning machining, the hardness of the material is improved, the hardness of the material is improved from HB180 to HB310 through common spinning machining and eccentric spinning machining, the strength of the material is greatly improved, and the service life of the material is prolonged. And the safety of the product is improved. And under the requirement of the same strength, the light-weight design requirement of the product can be met through spinning machining.

Description

Technical Field

[0001] The invention relates to the technical field of elevator parts processing, in particular to a spinning forming method for an elevator return rope wheel. Background Art

[0002] The elevator return rope pulley parts are an indispensable part of the elevator industry. During the operation of the elevator, they are the key load-bearing components and need to have sufficient strength to withstand sufficient loads. Due to the limitations of the processing technology, the previous molding methods are generally casting and then fine machining or split machining and then welding.

[0003] First of all, the welding method is prone to produce microscopic defects in the weld, which is not conducive to the improvement of overall performance. Reducing the welding process of the elevator return rope pulley parts or realizing the overall forming of the elevator return rope pulley parts is conducive to the improvement of overall performance, which is very important for the safety of elevator operation. In addition, the casting forming process also has defects such as sand holes and pits. In addition, the efficiency of machining this product is much lower than that of spinning.

[0004] In view of this, the present invention is proposed to solve the above technical problems. Summary of the invention

[0005] The object of the present invention is to provide a spin forming method for an elevator return rope pulley, so as to solve the technical problems that the forming method of the elevator return rope pulley in the prior art is not conducive to improving the overall performance and has low processing efficiency.

[0006] The technical solution of the present invention is: a method for spinning a return rope pulley of an elevator, comprising the following steps: Step 1: Design the spinning process. The spinning process is based on N- C The evenly distributed holes are used as the spinning process reference, the flange surface is the fixed surface, and the small end is spun first using the internal spinning process B , and then through multiple passes of general swirl large mouth end A Finally, the rope groove is formed by eccentric spinning to ensure that the pitch diameter of each rope groove is D Consistent size; Step 2: Design the spinning blank and determine the blank size required for the large end and the small end according to the spinning process and product structure; Step 3, designing the spinning process, the spinning process includes designing the spinning mold, designing the spinning wheel attack angle and spinning wheel morphology, designing the spinning wheel gap line, designing the spinning trajectory, generating the spinning program, and designing the spinning parameters; Step 4, spinning, the spinning forming includes spinning a small mouth end, spinning a large mouth end, and eccentric spinning of a rope groove structure in sequence; Step 5: Inspect parts.

[0007] Furthermore, in step 2, the blank is selected as a sheet material, the blank thickness T0 is designed, the small end inner rotation thinning rate is 15%, and the small end product thickness T1 is calculated by the blank thickness T0; The large end spinning is a multi-pass ordinary spinning process, and the thinning rate of the large end ordinary spinning is 20%. The thickness T2 of the large end product is calculated by the blank thickness T0; The outer diameter of the blank at the large end is designed to be 外 , the volume of the large end is V 大 , and the size of the blank at the large end is designed to be L3, then the volume of the large end is V 外 , from which we can get: 外= A+ 2L3; In order to ensure that the spinning product has a certain margin, the blank volume at the large end of the product is designed to be 1.2V 大 , then V 外 =1.2V 大 ; The wide end is the inner diameter A , a ring with a wall thickness of T2 and a height of L2. Therefore, the large end L2 can be divided into N T0, then L2=N*T0, then V 大 is the volume V of N small rings E The sum of , then: V 大 =N*V E ; Expand the small ring into a cuboid, then V E =π* A *T0*T2; Take the inner diameter of the blank on the large end F , the wall thickness is T0, the thickness of the upper ring is T0, then the volume of the upper ring is V F =π* F *T0*T2; Since the diameter of the blank changes little during the ordinary spinning process, it is approximately considered that F = A , then V F =V E ; Divide the billet size L3 into 1.2N V E , calculated from this: L3=1.2* *T2; The inner diameter of the small end blank is designed to be 内， The volume of the small end is V 小 , the design size of the small end blank is L4, then the volume of the small end is V 内 , from which we can get: V 内 = B -2L4; In order to ensure that the spinning product has a certain margin, the blank volume at the small end of the product is designed to be 1.2V 内 , and calculated: L4=1.2* *T1; The outer diameter of the blank size is determined by the above calculation: 外 , inner diameter is 内 , with a wall thickness of T0, and an outer diameter of 外 , inner diameter is 内 , spinning blank with wall thickness T0.

[0008] Furthermore, the spinning gap line is 0.8-1.0 times of the wall thickness T0.

[0009] Further, in step 3, the attack angle of the rotary wheel at the small mouth end is 20°, and the rotary wheel at the small mouth end is a single cone rotary wheel, and the radius R of the rotary wheel at the small mouth end is greater than T0; The attack angle of the wheel at the large mouth end is 45°, and the wheel at the large mouth end is a double-conical wheel, and the wheel radius R of the large mouth end is ≥2T0.

[0010] Furthermore, in step 3, the motion trajectory of the spinning wheel at the small mouth end is an arc line, and a single-pass forward spinning of "forward-forward" is adopted, and the number of spinning passes is 4; The motion trajectory of the spinning wheel at the large mouth end is an arc line. The motion trajectory is designed according to the length of the part. In the initial spinning process, single-pass forward spinning is adopted with 2 spinning passes to pre-deform the material so that the material has a tendency to tilt in the deformation direction. Then, the forming spinning trajectory is designed as a multi-group forming trajectory of "forward-forward-return" with 6 spinning passes. Finally, the "forward-forward" spinning trajectory is adopted to gradually form the material.

[0011] Further, in step 3, the spinning parameters include spinning temperature, machine tool speed, and spinning wheel feed parameters; When spinning the small end inward, the machine speed is 150rev / min and the feed speed is 100mm / min; When spinning the large end, the machine speed is 180rev / min, the feed speed is 150mm / min when the spinning track fits the mold, and the feed speed is 1600mm / min when the spinning track does not fit the mold.

[0012] Further, the spinning process of the small mouth end includes the following steps: ①Fix the spinning tire on the spinning machine; ②Install the internal rotating tool bar and rotating wheel, and perform tool setting (determine the zero point in the X and Z directions), run the spinning program dry, and measure the gap between the rotating wheel and the mold. If there is any deviation, it needs to be adjusted in the tool compensation control; ③Fix the blank on the spinning mold: through N- C Evenly distributed holes are positioned and fixed by a pressure plate; ④ Start the machine tool and run the spinning track; ⑤After spinning, remove the parts after turning to length L1.

[0013] Further, the spinning process of the large mouth end includes the following steps: ①Install the spinning wheel and perform tool setting (determine the zero point in the X and Z directions), run the spinning program dry, and measure the gap between the spinning wheel and the mold. If there is any deviation, it needs to be adjusted in the tool compensation control; ② The spinning mold remains unchanged, and the small end of the product after spinning is fixed on the spinning mold, and the N- C Evenly distributed holes are used for positioning and fixed through the tail top; ③ Start the machine tool and run the spinning track; ④After spinning, remove the parts after turning to length L2.

[0014] Furthermore, the eccentrically spun rope groove structure comprises the following steps: ①Fix the eccentric spinning tire on the spinning machine; ②Install the spinning wheel and perform tool setting (determine the zero point in the X and Z directions), run the spinning program dry, and measure the gap between the spinning wheel and the mold. If there is any deviation, it needs to be adjusted in the tool compensation control; ③Fix the large end of the product after spinning on the spinning mold and fix it through the tail top; ④ Start the machine tool and run the spinning track; ⑤After spinning is completed, take out the parts.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects: This application can overcome the shortcomings of casting and welding processes, and can significantly shorten the processing cycle and improve processing efficiency. In addition, spinning can harden the material and improve the hardness of the material. Through normal spinning and eccentric spinning, the material hardness is increased from HB180 to HB310 through two spinning processes, which greatly improves the strength of the material and improves the safety of the product. Under the same strength requirements, spinning can meet the lightweight design requirements of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings: Figure 1 A structural diagram of the parts of an elevator return rope pulley provided in the present embodiment of the present application in the method for spinning the elevator return rope pulley; Figure 2 A design structure diagram of an elevator return rope pulley blank for the elevator return rope pulley spinning forming method provided in this embodiment of the present application; Figure 3 A schematic diagram of the spinning of the small end of the elevator return rope pulley of the elevator return rope pulley spinning forming method provided in this embodiment of the present application; Figure 4 A schematic diagram of the spinning of the large end of the elevator return rope pulley of the elevator return rope pulley spinning forming method provided in this embodiment of the present application; Figure 5 A schematic diagram of the eccentric spinning of an elevator return rope pulley according to the spinning forming method of the elevator return rope pulley provided in this embodiment of the present application.

[0017] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0018] The specific implementation modes of the present invention are further described in detail with reference to the accompanying drawings.

[0019] See also Figures 1 to 5 As shown, the embodiment of the present application provides a method for spinning a return rope pulley of an elevator, comprising the following steps: Step 1: See Figure 1 As shown, in the prior art, the elevator return rope pulley product is a rotating body part, which can be divided into three parts from the flange surface, the large end, and the small end. The elevator return rope pulley product can be processed by sheet drawing, rib pressing and spinning. C Evenly distribute the holes, first use the stretching die to spin the shape (the rope groove is processed into a cylindrical section), replace the ribbed die to eccentrically spin the rope groove, and then process the elevator return rope wheel N- C Evenly distributed holes. However, this spinning processing method still has problems. First, the flatness of the flange surface will change after spinning processing, and the force will be uneven when bearing load. The elevator return rope pulley carries a large load, and the uneven force on the flange surface will cause product deformation, which poses certain risks. Second, the product will have elliptical deformation after demoulding, and the N- C The uniformly distributed holes cannot guarantee the position accuracy of the hole position and the product shape. Therefore, the spinning process is designed. The spinning process is based on N- C The evenly distributed holes are used as the spinning process reference, the flange surface is the fixed surface, and the small end is spun first using the internal spinning process B , and then through multiple passes of general swirl large mouth end A Finally, the rope groove is formed by eccentric spinning to ensure that the pitch diameter of each rope groove is D The size is consistent, which can not only ensure that the flange surface does not participate in the spinning deformation, but also ensure that the spinning surface is consistent with the N- C Position accuracy of evenly distributed holes.

[0020] Step 2: Design the spinning blank and determine the blank size required for the large end and the small end according to the spinning process and product structure.

[0021] Step 3, designing the spinning process, the spinning process includes designing the spinning mold, designing the spinning wheel attack angle and spinning wheel morphology, designing the spinning wheel gap line, designing the spinning trajectory, generating the spinning program, and designing the spinning parameters.

[0022] Design of spinning mold: The spinning mold surface is designed according to the theoretical inner surface of the part, and the holes for fixing the machine tool and the blank are added. In order to ensure that the part has an appropriate processing allowance, the mold length is extended by 60mm. The spinning mold is subjected to large torque and pressure during the deformation process. The embodiment of this application takes spinning forming under normal temperature conditions or water cooling conditions as an example, and the mold is selected from cold working die steel Cr12MoV.

[0023] Design the attack angle and morphology of the roller: The roller is the main tool for applying deformation force. The roller can passively rotate synchronously with the blank under the action of friction. The roller is spun at room temperature or under water cooling conditions. The roller material is Cr12MoV, and the hardness after overall heat treatment is HRC58-62.

[0024] Step 4, spinning, the spinning forming includes spinning a small mouth end, spinning a large mouth end, and eccentric spinning of a rope groove structure in sequence; Step 5: Inspect parts. After the product is spun, inspect the product size according to the inspection drawing, check the rope groove size on the sample, measure the hardness of the spinning position, and take samples, test and inspect according to the requirements of the finished product.

[0025] In step 2, see Figure 2 As shown, the blank is selected as sheet material, the blank thickness is designed to be T0, the inner rotation thinning rate of the small end is 15%, and the product thickness T1 of the small end is calculated by the blank thickness T0; The large end spinning is a multi-pass ordinary spinning process, and the thinning rate of the large end ordinary spinning is 20%. The large end product thickness T2 is calculated by the blank thickness T0. In order to ensure the strength of the rope groove structure, the spinning parameters can be adjusted; The outer diameter of the blank at the large end is designed to be 外 , the volume of the large end is V 大 , and the size of the blank at the large end is designed to be L3, then the volume of the large end is V 外 , from which we can get: 外= A+ 2L3; In order to ensure that the spinning product has a certain margin, the blank volume at the large end of the product is designed to be 1.2V 大 , then V 外 =1.2V 大 ; The wide end is the inner diameter A , a ring with a wall thickness of T2 and a height of L2. Therefore, the large end L2 can be divided into N T0, then L2=N*T0, then V 大 is the volume V of N small rings E The sum of , then: V 大 =N*V E ; Expand the small ring into a cuboid, then ; Take the inner diameter of the blank on the large end F , the wall thickness is T0, the thickness of the upper ring is T0, then the volume of the upper ring is ; Since the diameter of the blank changes little during the ordinary spinning process, it is approximately considered that F = A , then V F =VE ; Divide the billet size L3 into 1.2N V E , calculated from this: ; The inner diameter of the small end blank is designed to be 内， The volume of the small end is V 小 , the design size of the small end blank is L4, then the volume of the small end is V 内 , from which we can get: ; In order to ensure that the spinning product has a certain margin, the blank volume at the small end of the product is designed to be 1.2V 内 , and calculated: L4=1.2* *T1; The outer diameter of the blank size is determined by the above calculation: 外 , inner diameter is 内 , with a wall thickness of T0, and an outer diameter of 外 , inner diameter is 内 , spinning blank with wall thickness T0.

[0026] Design the spinning wheel gap line: Draw the spinning wheel gap line according to the part shape. First, set the spinning gap line. The spinning gap line is the farthest distance between the spinning wheel and the spinning mold. The spinning gap line is 0.8-1.0 times the wall thickness T0. The embodiment of the present application selects the spinning gap line as 1.0 times the wall thickness T0, and then performs process design and adjustment based on the first piece processing thickness.

[0027] In step 3, see Figure 3 As shown, the blank is positioned by the positioning pin, fixed with the fixing bolt, the pressure plate and the spinning mold, the spindle drives the spinning mold to rotate during the spinning process, the spinning wheel rotates passively driven by the friction force, and the spinning wheel moves according to the drawn motion trajectory to crush the material, thus realizing the forming of the part structure, and the small-mouth end spinning product of the elevator return rope pulley is obtained. The spinning of the small-mouth end is inward-rotating, and an inward-rotating cutter bar needs to be designed. The attack angle of the spinning wheel at the small-mouth end is 20°, and the spinning wheel at the small-mouth end is a single-conical spinning wheel. The radius R of the spinning wheel at the small-mouth end is greater than T0. The radius R of the spinning wheel at the small-mouth end of the embodiment of the present application is 6mm.

[0028] See also Figure 4As shown, by spinning the small end of the elevator return rope pulley, a spinning product of the small end of the elevator return rope pulley is obtained, and the spinning product of the small end of the return rope pulley is positioned by a positioning pin, and the tail top is pressed and fixed with the spinning mold. During the spinning process, the main shaft drives the spinning mold and the tail top to rotate, and the spinning wheel is passively rotated under the drive of friction. The spinning wheel moves according to the drawn motion trajectory, and the material is crushed to achieve the part structure forming, and the spinning product of the large end of the elevator return rope pulley is obtained. The attack angle of the spinning wheel at the large end is 45°, and this attack angle will not interfere with the mold tooling, and the spinning wheel at the large end is a double-conical spinning wheel. In order to achieve a spinning thinning rate of 20%, the radius R of the spinning wheel at the large end is ≥2T0. The radius R of the spinning wheel at the large end of the embodiment of the present application is 12mm.

[0029] Design the attack angle and morphology of the eccentric spinning wheel: During the eccentric spinning process, the wheel is 90° to the product surface, and the wheel morphology is the same as the contour of the rope groove. In order to prevent the large mouth from opening during the eccentric spinning process, resulting in excessive mouth size, the thickness of the eccentric spinning wheel should be as consistent as possible with the product length L2. If the product size is longer, excluding the deformation position, the length margin at both ends should be ≥20mm.

[0030] In step 3, the motion trajectory of the spinning wheel is designed: the motion trajectory of the spinning wheel can control the deformation of the material during the spinning process and is the intermediate configuration of each spinning process. During the spinning deformation process, there is both a reduction in material thickness and a change in shape, which requires a distribution of passes for gradual formation.

[0031] The motion trajectory of the spinning wheel at the small end is an arc line, and the motion trajectory is designed according to the length of the part. Since the length of the small end is small, a single-pass forward spinning of "forward-forward" is adopted, and the number of spinning passes is 4; the number of spinning trajectories can be adjusted according to the material deformation effect during the spinning process and the dimensional accuracy of the first piece after spinning.

[0032] The motion trajectory of the spinning wheel at the large mouth end is an arc line. The motion trajectory is designed according to the length of the part. In the initial spinning process, a single-pass forward spinning is used, and the number of spinning passes is 2. The material is pre-deformed so that the material has a tendency to tilt in the deformation direction. Then the forming spinning trajectory is designed as a multi-group forming trajectory of "forward-forward-return", and the number of spinning passes is 6. Finally, the spinning trajectory of "forward-forward" is used to gradually form the material; in this way, the trajectory design of the large mouth end spinning deformation is completed. The number of spinning trajectories can be adjusted according to the material deformation effect during the spinning process and the dimensional accuracy of the first piece after spinning.

[0033] See also Figure 5As shown, the elevator return rope pulley large end spinning forming product is obtained by spinning the large end of the elevator return rope pulley, and the elevator return rope pulley large end spinning forming product is fixed on the spinning tire by the tail top. During the spinning process, the main shaft drives the spinning tire and the tail top to rotate, and the spinning wheel is passively rotated under the drive of friction. The spinning wheel moves to the position of the spinning wheel gap line to realize the formation of the part rope groove structure, and the elevator return rope pulley part is obtained. Design the motion trajectory of the eccentric spinning wheel: The motion trajectory of the eccentric spinning wheel is a straight line, and it only needs to confirm the spinning wheel gap line.

[0034] Generate spinning program: After adding auxiliary lines such as feed and retract, generate NC program code on the programming software and perform simulation test on the generated code.

[0035] In step 3, the spinning parameters include spinning temperature, machine tool speed, and spinning wheel feed parameters; When spinning the small end inward, the machine speed is 150rev / min and the feed speed is 100mm / min; When spinning the large end, the machine speed is 180rev / min, the feed speed is 150mm / min when the spinning track fits the mold, and the feed speed is 1600mm / min when the spinning track does not fit the mold.

[0036] See also Figure 1 , Figure 2 and Figure 3 As shown, the spinning process of the small mouth end includes the following steps: ①Fix the spinning tire on the spinning machine; ②Install the internal rotating tool bar and rotating wheel, and perform tool setting (determine the zero point in the X and Z directions), run the spinning program dry, and measure the gap between the rotating wheel and the mold. If there is any deviation, it needs to be adjusted in the tool compensation control; ③Fix the blank on the spinning mold: through N- C Evenly distributed holes are positioned and fixed by a pressure plate; ④ Start the machine tool and run the spinning track; ⑤After spinning, remove the parts after turning to length L1.

[0037] See also Figure 1 , Figure 2 and Figure 4 As shown, the spinning process of the large mouth end includes the following steps: ①Install the spinning wheel and perform tool setting (determine the zero point in the X and Z directions), run the spinning program dry, and measure the gap between the spinning wheel and the mold. If there is any deviation, it needs to be adjusted in the tool compensation control; ② The spinning mold remains unchanged, and the small end of the product after spinning is fixed on the spinning mold, and the N- CEvenly distributed holes are used for positioning and fixed through the tail top; ③ Start the machine tool and run the spinning track; ④After spinning, remove the parts after turning to length L2.

[0038] See also Figure 1 , Figure 2 and Figure 5 As shown, the eccentric spinning rope groove structure includes the following steps: ①Fix the eccentric spinning tire on the spinning machine; ②Install the spinning wheel and perform tool setting (determine the zero point in the X and Z directions), run the spinning program dry, and measure the gap between the spinning wheel and the mold. If there is any deviation, it needs to be adjusted in the tool compensation control; ③Fix the large end of the product after spinning on the spinning mold and fix it through the tail top; ④ Start the machine tool and run the spinning track; ⑤After spinning is completed, take out the parts.

[0039] It should be noted that the spinning process has many advantages in the preparation of the rotating body parts. The elevator return rope pulley parts can be formed by spinning the sheet as a whole, which greatly improves the processing efficiency. The spinning process is also a hardening process for the material. The performance of the material can be improved through spinning, including hardness and strength. Under the same performance requirements, the weight of the spinning product is less than that of the machined product, which can meet the requirements of product lightweighting. In addition, the cost of the spinning mold is greatly reduced compared to the casting mold.

[0040] This specific embodiment is merely an explanation of the invention and is not a limitation of the invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as they are within the scope of protection of the invention, they are protected by patent law.

Claims

1. A method for spinning an elevator return rope pulley, characterized in that: The following steps are involved: Step 1: Design a spinning process, wherein the spinning process is based on N- C The evenly distributed holes are used as the spinning process reference, the flange surface is the fixed surface, and the small end is spun first using the internal spinning process B , and then through multiple passes of general swirl large mouth end A Finally, the rope groove is formed by eccentric spinning to ensure that the pitch diameter of each rope groove is D Consistent size; Step 2, designing the spinning blank, and determining the blank size required for the large end and the small end according to the spinning process and the product structure; Step 3, designing the spinning process, wherein the spinning process sequentially includes designing a spinning mold, designing a spinning wheel attack angle and a spinning wheel morphology, designing a spinning wheel gap line, designing a spinning trajectory, generating a spinning program, and designing spinning parameters; Step 4, spinning, wherein the spinning includes spinning a small-mouth end, spinning a large-mouth end, and eccentric spinning of a rope groove structure in sequence; Step 5: Inspect parts.

2. The elevator return rope pulley spinning forming method according to claim 1, characterized in that: In the step 2, the blank is selected as a sheet material, the blank thickness T0 is designed, the small end inner rotation thinning rate is 15%, and the small end product thickness T1 is calculated by the blank thickness T0; The large end spinning is a multi-pass ordinary spinning process, and the thinning rate of the large end ordinary spinning is 20%. The thickness T2 of the large end product is calculated by the blank thickness T0; The outer diameter of the blank at the large end is designed to be 外 , the volume of the large end is V 大 , and the size of the blank at the large end is designed to be L3, then the volume of the large end is V 外 , from which we can get: 外= A+ 2L3； In order to ensure that the spinning product has a certain margin, the blank volume at the large end of the product is designed to be 1.2V 大 , then V 外 =1.2V 大 ; The wide end is the inner diameter A , a ring with a wall thickness of T2 and a height of L2. Therefore, the large end L2 can be divided into N T0, then L2=N*T0, then V 大 is the volume V of N small rings E The sum of , then: V 大 =N*V E ; Expand the small ring into a cuboid, then V E =π* A *T0*T2; Take the inner diameter of the blank on the large end F , the wall thickness is T0, the thickness of the upper ring is T0, then the volume of the upper ring is V F =π* F *T0*T2; Since the diameter of the blank changes little during the ordinary spinning process, it is approximately considered that F = A , then V F =V E ; Divide the billet size L3 into 1.2N V E , calculated from this: L3=1.2* *T2; The inner diameter of the small end blank is designed to be 内， The volume of the small end is V 小 , the design size of the small end blank is L4, then the volume of the small end is V 内 , from which we can get: V 内 = B -2L4; In order to ensure that the spinning product has a certain margin, the blank volume at the small end of the product is designed to be 1.2V 内 , and calculated: L4=1.2* *T1; The outer diameter of the blank size is determined by the above calculation: 外 , inner diameter is 内 , with a wall thickness of T0, and an outer diameter of 外 , inner diameter is 内 , spinning blank with wall thickness T0.

3. The elevator return rope pulley spinning forming method according to claim 1, characterized in that: The spinning gap line is 0.8-1.0 times of the wall thickness T0.

4. The elevator return rope pulley spinning forming method according to claim 3, characterized in that: In step 3, the attack angle of the roller at the small mouth end is 20°, and the roller at the small mouth end is a single cone roller, and the radius R of the roller at the small mouth end is greater than T0; The attack angle of the wheel at the large mouth end is 45°, and the wheel at the large mouth end is a double-conical wheel, and the wheel radius R of the large mouth end is ≥2T0.

5. The elevator return rope pulley spinning forming method according to claim 4, characterized in that: In the step 3, the motion trajectory of the spinning wheel at the small mouth end is an arc line, and a single-pass forward spinning of "forward-forward" is adopted, and the number of spinning passes is 4; The motion trajectory of the spinning wheel at the large mouth end is an arc line. The motion trajectory is designed according to the length of the part. In the initial spinning process, single-pass forward spinning is used with 2 passes. The material is pre-deformed to make the material tend to tilt in the deformation direction. Then the forming spinning trajectory is designed as a multi-group forming trajectory of "forward-forward-return", with 6 passes. Finally, the "forward-forward" spinning trajectory is used to gradually form the material.

6. The elevator return rope pulley spinning forming method according to claim 5, characterized in that: In step 3, the spinning parameters include spinning temperature, machine tool speed, and spinning wheel feed parameters; When spinning the small end inward, the machine speed is 150rev / min and the feed speed is 100mm / min; When spinning the large end, the machine speed is 180rev / min, the feed speed is 150mm / min when the spinning track fits the mold, and the feed speed is 1600mm / min when the spinning track does not fit the mold.

7. The elevator return rope pulley spinning forming method according to claim 6, characterized in that: The spinning process of the small mouth end comprises the following steps: ①Fix the spinning tire on the spinning machine; ②Install the internal rotating tool bar and rotating wheel, and perform tool setting (determine the zero point in the X and Z directions), run the spinning program dry, and measure the gap between the rotating wheel and the mold. If there is any deviation, it needs to be adjusted in the tool compensation control; ③Fix the blank on the spinning mold: through N- C Evenly distributed holes are positioned and fixed by a pressure plate; ④ Start the machine tool and run the spinning track; ⑤After spinning, remove the parts after turning to length L1.

8. The elevator return rope pulley spinning forming method according to claim 7, characterized in that: The spinning process of the large mouth end comprises the following steps: ①Install the spinning wheel and perform tool setting (determine the zero point in the X and Z directions), run the spinning program dry, and measure the gap between the spinning wheel and the mold. If there is any deviation, it needs to be adjusted in the tool compensation control; ② The spinning mold remains unchanged, and the small end of the product after spinning is fixed on the spinning mold, and the N- C Evenly distributed holes are used for positioning and fixed by the tail top; ③ Start the machine tool and run the spinning track; ④After spinning, remove the parts after turning to length L2.

9. The elevator return rope pulley spinning forming method according to claim 8, characterized in that: The eccentric spinning rope groove structure comprises the following steps: ①Fix the eccentric spinning tire on the spinning machine; ②Install the spinning wheel and perform tool setting (determine the zero point in the X and Z directions), run the spinning program dry, and measure the gap between the spinning wheel and the mold. If there is any deviation, it needs to be adjusted in the tool compensation control; ③Fix the large end of the product after spinning on the spinning mold and fix it through the tail top; ④ Start the machine tool and run the spinning track; ⑤After spinning is completed, take out the parts.

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