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CN-122007372-A - Manufacturing process of fan-shaped supporting piece

CN122007372ACN 122007372 ACN122007372 ACN 122007372ACN-122007372-A

Abstract

The application relates to the technical field of metal processing, in particular to a manufacturing process of a fan-shaped supporting piece, which comprises the following steps of smelting casting raw materials, injecting and filling the casting raw materials into a forming die; step two, cleaning castings after solidification and molding, step three, annealing and heating, step four, adopting vibration aging equipment to release residual stress in the sector blank, step five, putting the sector blank into a shaping die, applying pressure to the shaping die, then unloading the shaping die in stages to bear the pressure, and step six, machining the sector blank to the size of a finished product. The manufacturing process of the sector support provided by the application adopts a vibration aging method to eliminate the residual stress of the sector support in advance, then applies pressure to the sector support through the die cavity, so as to promote the even differentiation and relaxation of the residual extremely micro stress in the sector support, ensure the dimensional stability of the sector support, improve the precision of the sector support and solve the problems of surface deformation and out-of-tolerance parallelism of the sector support.

Inventors

  • LV HUAQIANG
  • MAO LIYAN
  • JU LING
  • WANG WENLONG
  • TENG WEIPENG

Assignees

  • 莱州市莱索制品有限公司

Dates

Publication Date
20260512
Application Date
20260410

Claims (7)

  1. 1. A process for manufacturing a fan-shaped support, the process comprising the steps of: firstly, placing casting raw materials into an induction furnace, heating to 720-750 ℃ and smelting to obtain molten metal, pouring the molten metal into a pressing chamber of a die casting machine, filling the molten metal in the pressing chamber of the die casting machine into a forming die cavity, and maintaining the pressure for 8-12s; step two, cooling and solidifying the molten metal in a die cavity, opening the die, taking out the casting, cutting off a gate and burrs on the surface of the casting, and blasting to remove oxide skin, rust and greasy dirt on the surface of the casting to obtain a fan-shaped blank; step three, annealing and heating the fan-shaped blank to 300-350 ℃, keeping the temperature for 2-3 hours, and discharging the blank from the furnace for cooling to less than or equal to 250 ℃; supporting the sector blank on a processing platform through an elastic rubber pad, and applying vibration near the natural frequency of the sector blank by adopting vibration aging equipment to release the residual stress in the sector blank; Step five, placing the sector blank into a shaping die, ensuring that a positioning reference of the sector blank is accurately matched with a positioning mechanism of the die, applying pressure of 200-300t to the shaping die by adopting a press, unloading the shaping die in stages to bear the pressure, opening the shaping die after the pressure is unloaded, and taking out the sector blank; And step six, turning the positioning steps of the diameter of the outer circle, the end face and the end face of the fan-shaped blank by taking the fan-shaped face and the end face of the fan-shaped blank as positioning references, turning the fan-shaped blank to a finish machining size, then drilling and boring the fan-shaped blank, removing the surface machining prefabricated process holes of the fan-shaped blank, and grinding the fan-shaped blank to a finished product size to obtain the fan-shaped support piece.
  2. 2. The process for manufacturing the fan-shaped supporting piece according to claim 1, wherein the shaping die provided in the fifth step comprises an upper die holder and a lower die holder, wherein an inner die cavity of the upper die holder is manufactured according to the concave-convex shape of the A surface of the fan-shaped blank, the concave-convex surface of the A surface of the fan-shaped blank is completely attached to the inner die cavity of the upper die holder, the inner die cavity of the lower die holder is manufactured according to the concave-convex shape of the B surface of the fan-shaped blank, and the concave-convex surface of the B surface of the fan-shaped blank is completely attached to the inner die cavity of the lower die holder.
  3. 3. The process for manufacturing a fan-shaped supporting member according to claim 2, wherein the depth of the inner cavity of the upper die holder and the depth of the inner cavity of the lower die holder are each smaller than half the thickness of the fan-shaped blank.
  4. 4. A process for manufacturing a sector support according to claim 1, characterized in that the stage unloading shaping mould set forth in step five is subjected to a pressure of 20% of the total unloading pressure of 5 min.
  5. 5. The manufacturing process of the fan-shaped supporting piece according to claim 1, wherein the casting surface shot blasting treatment equipment provided in the second step is a crawler type shot blasting machine, cast steel shots with the diameter of 0.8-1.2mm and the hardness of HRC40-45 are selected as abrasive materials, and the speed of the abrasive materials is 60-80m/s.
  6. 6. The process for manufacturing the sector support according to claim 1, wherein the verticality between the end face and the outer circle of the sector blank after the turning in the step six is less than or equal to 0.02mm/m, the flatness of the end face is less than or equal to 0.03mm, and the tolerance of the positioning step is +/-0.05 mm.
  7. 7. The process for manufacturing a sector support according to claim 1, wherein the surface roughness of the sector plane of the sector blank turned in the sixth step is ra1.6 μm, and the flatness is not more than 0.02mm/m.

Description

Manufacturing process of fan-shaped supporting piece Technical Field The invention relates to the technical field of metal processing, in particular to a manufacturing process of a fan-shaped supporting piece. Background The sector is a key part applied to a rail transit braking system, and the surface of the sector realizes train braking by installing a friction pair, so that the quality of the sector directly influences the safe operation of a rail car; Wang Hua, sun Zhijun, zhang Lingfeng and Chang Tao are respectively described in the publication of analysis and prevention of cracks of a precisely cast K242 alloy positioning fan-shaped piece, wherein cracks perpendicular to the machining direction appear on the surface of the fan-shaped piece during casting machining, and the cracks extend along a dendrite carbide network, which is related to slow casting cooling and carbide aggregation, and the conventional casting technology adopts an integral module for heat preservation and slow cooling, so that coarse grains and concentrated stress of the fan-shaped casting are easily caused, and thermal stress and cutting stress are superposed during machining, so that the cracks are initiated. Ru Leilei, su, liu, wang Rui, guo Liang, li Tao, wangxing, shouyu and Li Peng are described in the publication of optimization of sector processing technique and improvement of efficiency, in which, when a sector is cast, the milling amount of the B surface of the sector is small and uniform, the milling amount of the A surface of the sector is large and uneven, residual stress of the milled sector is not completely released, the milling amount difference of the A surface and the B surface of the sector can cause deformation after stress release, so that parallelism of processing technique holes of the A surface, the B surface of the sector is out of tolerance and cannot be assembled with the upper-level assembly. However, when a hydraulic jack is adopted to apply a reaction force in the deformation direction, macroscopic plastic deformation is generated on the B surface of the sector piece, the deformation amount of the B surface of the sector piece cannot be determined, errors are easy to occur in the deformation amount of the B surface of the sector piece, the A surface and the B surface of the sector piece still have the problem of out-of-tolerance parallelism due to the deformation trend caused by the fact that the deformation amount of the B surface of the sector piece exceeds the processing stress, in addition, when finish milling and hole processing are carried out on the sector piece, the clamping force applied by a clamp on a machine tool clamps the sector piece can enable the sector piece to elastically deform, the machine tool processes the surface of the sector piece in a deformed state, the sector piece after the clamp is disassembled is enabled to rebound, the processing surface is enabled to deform, and the processing precision of the sector piece is affected. Therefore, a process for manufacturing a fan-shaped support member capable of eliminating the influence of stress deformation and improving the manufacturing accuracy is needed to solve the above-mentioned problems in the related art. Disclosure of Invention The invention aims to provide a manufacturing process of a fan-shaped support piece, which adopts a vibration time-effect method in advance to eliminate most of residual stress generated during the casting process of the fan-shaped support piece, then applies pressure to the fan-shaped support piece through a die cavity to promote even differentiation and relaxation of residual extremely micro stress in the fan-shaped support piece, ensures the size stability of the fan-shaped support piece and improves the accuracy of the fan-shaped support piece, so as to solve the problems in the prior art. In order to achieve the above purpose, the present invention provides the following technical solutions: A manufacturing process of a fan-shaped supporting piece comprises the following steps: firstly, placing casting raw materials into an induction furnace, heating to 720-750 ℃ and smelting to obtain molten metal, pouring the molten metal into a pressing chamber of a die casting machine, filling the molten metal in the pressing chamber of the die casting machine into a forming die cavity, and maintaining the pressure for 8-12s; step two, cooling and solidifying the molten metal in a die cavity, opening the die, taking out the casting, cutting off a gate and burrs on the surface of the casting, and blasting to remove oxide skin, rust and greasy dirt on the surface of the casting to obtain a fan-shaped blank; step three, annealing and heating the fan-shaped blank to 300-350 ℃, keeping the temperature for 2-3 hours, and discharging the blank from the furnace for cooling to less than or equal to 250 ℃; supporting the sector blank on a processing platform through an elastic rubber pad, and applying vibration near