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Shaft machining technology capable of reducing heat treatment bend amount

A technology of processing technology and bending amount, which is applied in the field of shaft processing technology, can solve the problems of large thermal deformation and long grinding time, and achieve the effects of increasing surface stress, reducing time required and improving efficiency

Inactive Publication Date: 2017-09-05
SHANGHAI XIANGMING BEARING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Due to the large thermal deformation of the traditional preparation process, the time required for grinding is also long. For example, the grinding time of the upper shaft of the bearing used in the automobile cooling water pump is about 35-45S

Method used

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  • Shaft machining technology capable of reducing heat treatment bend amount
  • Shaft machining technology capable of reducing heat treatment bend amount
  • Shaft machining technology capable of reducing heat treatment bend amount

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Shaft machining to reduce heat treatment curvature (eg figure 1 , the outer diameter of the large shaft 11 is the large outer diameter, and the outer diameter of the small shaft 12 is the small outer diameter)

[0035] (1) The blanking material adopts cold drawn cylindrical bar, raw material Gcr15 (special steel for making bearings, the same below), bar length 6000mm, diameter Hardness HBW179-250, automatic feeding by punching and shearing machine, automatic punching and cutting according to the set length, the length of the shaft is 153mm, the diameter is not processed, it is still

[0036] (2) Turning uses CNC numerical control machine tool to bar material outside diameter turned to Turn one end face and chamfer, re-clamp, the outer diameter of the large shaft 11 is the large outer diameter, the outer diameter of the small shaft 12 is the small outer diameter, and the small outer diameter is machined Length 50mm (length-diameter ratio is 4), right ...

Embodiment 2

[0040] Example 2 Shaft machining to reduce heat treatment curvature (eg figure 2 As shown, the outer diameter of the large shaft 11 is the large outer diameter, the outer diameter of the small shaft 12 is the small diameter 1, and the outer diameter of the second small shaft 13 is the small diameter 2)

[0041] (1) The blanking material adopts the cold drawn cylindrical bar with a length of 6000mm and a diameter of 6000mm. Hardness HBW179-250, automatic feeding by punching and shearing machine, automatic punching and cutting according to the set length, the length of the shaft is 139mm, the diameter is not processed, it is still

[0042] (2) Turning uses CNC numerical control machine tools to process the bar Outer diameter turning to Trail 1 is The length of the small diameter 1 is 19mm (±0.05), the end face and chamfer of the small diameter are processed by turning, re-clamping, and the small diameter is turned Small diameter 2 length 52mm, right Chamfering, mach...

Embodiment 3

[0045] Embodiment 3 reduces the shaft processing of heat treatment curvature (such as image 3 As shown, the outer diameter of the large shaft 11 is the large outer diameter, the outer diameter of the small shaft 12 is the small diameter 1, and the outer diameter of the second small shaft 13 is the small diameter 2)

[0046] (1) The blanking adopts the cold-drawn cylindrical bar, the length is 6000mm, the diameter Hardness HBW179-250, automatic feeding by punching and shearing machine, automatic punching and cutting according to the set length, the length of the shaft is 129mm, the diameter is not processed, it is still

[0047] (2) Turning uses CNC numerical control machine tools to process the bar Outer diameter turning to Trail 1 is The length of trail 1 is 15.5mm (±0.05), turn the end face and chamfer of trail 1, re-clamp, turn the trail Minor diameter 2 length 66mm (length-to-diameter ratio is 5, belongs to the slender shaft), for Chamfering, the total length...

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Abstract

The invention provides a shaft machining technology capable of reducing the heat treatment bend amount. The machining technology at least comprises the following steps of blanking, turning, heat treatment and grinding. The surface roughness of a semi-finished shaft prepared during turning is smaller than or equal to 6.3. By the adoption of the machining technology, shaft bend and deformation which is 0.35 MAX originally is reduced to 0.10 MAX after heat treatment, accordingly, grinding time is shortened, the working efficiency is improved, and the material utilization rate is also improved.

Description

technical field [0001] The invention relates to a shaft machining process for reducing the amount of bending in heat treatment. Background technique [0002] Bearings are commonly used components in industrial production. For example, the bearings for automobile cooling water pumps consist of a slender shaft (such as figure 1 shown) and an outer ring and accessories. The structure of the shaft is further divided into a straight shaft, a two-step shaft and a multi-step shaft. The main processing technology of the shaft is: blanking -> turning -> heat treatment -> grinding... assembly -> shipment. [0003] Heat treatment is a key process in a shaft machining process. Heat treatment refers to a metal thermal processing process in which the material is in a solid state by means of heating, heat preservation and cooling to obtain the desired structure and properties. Only after heat treatment can the shaft achieve suitable mechanical properties and excellent working...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/14
CPCB23P15/14
Inventor 瞿帮孝
Owner SHANGHAI XIANGMING BEARING
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