Automobile precision stepped shaft outer circle grinding machining process

A technology of cylindrical grinding and processing technology, applied in the field of stepped shafts, which can solve the problems of affecting cutting, unable to eliminate the stress of stepped shafts, soft spots and high hardness, and achieve the effects of refining grains, eliminating structural defects, and good quality

Inactive Publication Date: 2020-11-27
湖北隐冠轴业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a process for grinding the outer circle of the precision stepped shaft of an automobile, which solves the problem of tempering the stepped shaft when machining and grinding the outer circle of the stepped shaft of the automobile. When quenching and tempering the stepped shaft, the residual stress of the stepped shaft cannot be eliminated only through quenching and tempering, and the cooling method for the quenched and tempered shaft is natural cooling or water cooling, which is easy to produce soft spots and hardness that are not hardened The problem of high work that affects cutting

Method used

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  • Automobile precision stepped shaft outer circle grinding machining process

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Embodiment 1

[0029] A process for machining the cylindrical grinding of precision stepped shafts for automobiles, comprising the following steps:

[0030] S1. Positioning reference: use a three-jaw self-centering chuck to clamp the outer circle of the hot-rolled steel blank, use the outer circle of the blank as a rough reference, first process an end face on the outer circle of the blank, and drill a center hole with a center drill. And the outer circle at one end is turned out, and then the outer circle that has been turned out is used as a reference, clamped with a three-jaw self-centering chuck, and then the other end face of the outer circle of the blank is processed, and another center hole is drilled to make the blank The center holes at both ends of the outer circle are located on the same horizontal axis;

[0031] S2. Rough turning of the outer circle: After the machining of the center hole of the outer circle of the blank is completed, use the top of the tailstock of the lathe to ...

Embodiment 2

[0046] A process for machining the cylindrical grinding of precision stepped shafts for automobiles, comprising the following steps:

[0047] S1. Positioning reference: use a three-jaw self-centering chuck to clamp the outer circle of the hot-rolled steel blank, use the outer circle of the blank as a rough reference, first process an end face on the outer circle of the blank, and drill a center hole with a center drill. And the outer circle at one end is turned out, and then the outer circle that has been turned out is used as a reference, clamped with a three-jaw self-centering chuck, and then the other end face of the outer circle of the blank is processed, and another center hole is drilled to make the blank The center holes at both ends of the outer circle are located on the same horizontal axis;

[0048] S2. Rough turning of the outer circle: After the machining of the center hole of the outer circle of the blank is completed, use the top of the tailstock of the lathe to ...

Embodiment 3

[0063] A process for machining the cylindrical grinding of precision stepped shafts for automobiles, comprising the following steps:

[0064] S1. Positioning reference: use a three-jaw self-centering chuck to clamp the outer circle of the hot-rolled steel blank, use the outer circle of the blank as a rough reference, first process an end face on the outer circle of the blank, and drill a center hole with a center drill. And the outer circle at one end is turned out, and then the outer circle that has been turned out is used as a reference, clamped with a three-jaw self-centering chuck, and then the other end face of the outer circle of the blank is processed, and another center hole is drilled to make the blank The center holes at both ends of the outer circle are located on the same horizontal axis;

[0065] S2. Rough turning of the outer circle: After the machining of the center hole of the outer circle of the blank is completed, use the top of the tailstock of the lathe to ...

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Abstract

The invention discloses an automobile precision stepped shaft outer circle grinding machining process. The process comprises the steps of reference positioning, outer circle rough turning, hardening and tempering, primary center hole grinding, outer circle finish turning, secondary center hole grinding, grinding and inspection, wherein hot rolled steel is put into a vessel containing mineral oil again to be cooled, so that the temperature of the hot rolled steel is reduced to 400 DEG C. The invention relates to the technical field of automobile stepped shaft machining, in particular to the automobile precision stepped shaft outer circle grinding machining process. Cutting machinability can be improved through a method of carrying out annealing, quenching and tempering triple heat treatmenton a stepped shaft. Residual stress is eliminated, the size is stabilized, and deformation and crack tendency is reduced. The surface of the stepped shaft is subjected to grain refinement, structureadjustment and structure defect elimination, meanwhile, under the dual cooling work of oil cooling and saline water after quenching and tempering, the surface of the stepped shaft is subjected to polishing treatment through abrasive paper every time heat treatment is carried out, so that the surface of the stepped shaft can be smoother, and meanwhile the strength of steel can be improved.

Description

technical field [0001] The invention relates to the technical field of stepped shafts, in particular to an outer cylindrical grinding process for precision stepped shafts of automobiles. Background technique [0002] With the continuous improvement of people's living standards, more and more families own cars. Cars bring convenience to people's travel, and the stepped shaft is an indispensable part of the car. The stepped shaft is the bearing shaft. A method of axial positioning, stepped bushings are especially suitable for precision bearing arrangements. Compared with threaded lock nuts, they have less runout and provide higher accuracy. Stepped bushings are often used for ultra-high speed spindles. For this A spindle for which conventional locking devices cannot provide sufficient precision. [0003] But at present, when machining and grinding the outer circle of the stepped shaft of the automobile, it is necessary to quench and temper the stepped shaft, and when quenchin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/14
CPCB23P15/14
Inventor 张安好黄立朝王旭飞何平洲王丽
Owner 湖北隐冠轴业有限公司
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