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Method for manufacturing quill roller for bearing

A manufacturing method and needle roller technology, applied in the field of mechanical parts processing, can solve the problems of low processing efficiency of needle rollers and short service life of needle rollers, and achieve the effects of preventing uneven grinding, improving production efficiency and high contact fatigue performance.

Active Publication Date: 2012-06-20
NINGBO ZHONGHE AUTO PATS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects existing in the prior art, the present invention provides a manufacturing method of bearing needle rollers, which solves the technical problems of low single processing efficiency of bearing needle rollers and short service life of needle rollers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Select GCr15 steel to form a needle blank after cutting, and then use a barrel polisher to roll and polish the two ends of the needle into a spherical surface (throwing R balls). The barrel polisher can process 200kg of needles in each batch. The number of revolutions of the barrel polisher is 350 rpm, and the running time of the barrel polisher is 48 hours.

[0025] Then the needle roller blank after rolling and polishing is ground successively on a centerless grinder and a barrel polishing machine to remove the burrs on the surface of the needle roller and the peripheral spherical surface at both ends of the needle roller (throwing R angle).

[0026] Put it in a continuous furnace for heat treatment, heat treatment includes quenching step and tempering step, quenching step: temperature is 850 ° C, holding time is 170 minutes, HRC hardness is 66; during the quenching step, methanol is used for gas protection, and the flow rate of methanol 2L / h; tempering steps: tempera...

Embodiment 2

[0028] Select GCr15 steel to form a needle blank after cutting, and then use a barrel polisher to roll and polish the two ends of the needle into a spherical surface (throwing R balls). The barrel polisher can handle 280kg of needles per batch. The number of revolutions of the barrel polisher is 330 rpm, and the running time of the barrel polisher is 50 hours.

[0029] Then the needle roller blank after rolling and polishing is ground successively on a centerless grinder and a barrel polishing machine to remove the burrs on the surface of the needle roller and the peripheral spherical surface at both ends of the needle roller (throwing R angle).

[0030] Then it is placed in a continuous furnace for heat treatment, which includes a quenching step and a tempering step. Quenching step: the temperature is 830° C., the holding time is 190 minutes, and the HRC hardness is 64; methanol is used for gas protection during the quenching step, and the flow rate of methanol is 4 L / h. Tem...

Embodiment 3

[0032] Select GCr15 steel to form a needle blank after cutting, and then use a barrel polishing machine to roll and polish both ends of the needle into a spherical surface (throwing R balls). The barrel polishing machine can process 250kg of needles in each batch. The number of revolutions of the barrel polisher was 320 rpm, and the running time of the barrel polisher was 49 hours.

[0033] Then the needle roller blank after rolling and polishing is ground successively on a centerless grinder and a barrel polishing machine to remove the burrs on the surface of the needle roller and the peripheral spherical surface at both ends of the needle roller (throwing R angle).

[0034] Then it is placed in a continuous furnace for heat treatment, which includes a quenching step and a tempering step. Quenching step: the temperature is 880° C., the holding time is 240 minutes, and the HRC hardness is 68; methanol is used for gas protection during the quenching step, and the flow rate of m...

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Abstract

The invention relates to a method for manufacturing a quill roller for a bearing by adopting a roll-polishing way. The method comprises the following steps: A, roll polishing: cutting selected GCr15 steel to form a quill roller blank, and then, performing the roll polishing and grinding on the peripheries of both ends of the quill roller into spherical surfaces through a barrel polishing machine; B, heat treatment: grinding the roll-polished quill roller blank through a grinding machine, deburring through the barrel polishing machine, and then, performing quenching and tempering; and C, mechanical treatment: performing semi-coarse grinding, semi-accurate grinding and accurate grinding to obtain a finished product. The method for manufacturing the quill roller for the bearing by adopting the roll-polishing way is capable of treating a plurality of quill rollers at a time, and thereby, the production efficiency is greatly improved. The problems that uneven grinding and inhomogenous product quality often generated in the existing production are solved. The spherical surfaces of both ends of the obtained quill roller are ensured to be smooth, and the radian of each spherical surface meets the requirement, i.e. the spherical surfaces are neither too round nor too flat.

Description

technical field [0001] The invention relates to a method for manufacturing needle rollers, in particular to a method for manufacturing needle rollers for bearings by rolling and throwing, and belongs to the field of mechanical parts processing. Background technique [0002] The needle rollers are generally installed between the outer ring and the inner ring of the needle roller bearings. During operation, the rolling of the needle rollers is used to reduce the frictional resistance between the two relative moving parts. At present, there are mainly the following types of needle rollers in conventional technology. 1. Cylindrical needle rollers. This type of needle roller is mainly used for cylindrical needle roller bearings. Needle roller assemblies can also be used directly in machinery. has been standardized. 2. Long cylindrical needle rollers. There are two kinds of needle rollers with shaft diameter and no shaft diameter. They are mainly used for long cylindrical needle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24B31/02B24B37/02B24B19/16
Inventor 鲍德夫
Owner NINGBO ZHONGHE AUTO PATS
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