Integrated quenching process of drawn cup needle roller bearing

A needle roller bearing and overall quenching technology, which is applied in the field of quenching technology, can solve the problems of uneven surface hardness distribution of the outer ring, shallow carburized effective hardened layer, and reduced utilization rate, so as to achieve uniform surface hardness distribution and good wear resistance , the effect of improving the service life

CN101649379AInactive Publication Date: 2010-02-17常州苏特轴承制造有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2010-02-17
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention relates to the technical field of quenching processes, in particular to an integrated quenching process of a drawn cup needle roller bearing, which comprises the following steps: curling: assembling a needle roller, a drawn cup which is not treated by any heat treatment and a holder into a whole and then curling; quenching: carrying out the C-N joint infiltration quenching of the drawn cup needle roller bearing which is qualified by inspection after assembling and curling; and tempering: tempering the drawn cup needle roller bearing at high temperature. The quenching step achieves 0.08mm-0.28mm effective hardened layer with the surface hardness of 750-980HV, and the tempering step increase the surface hardness to 664-856HV. The integrated quenching process ensures that the surface hardness of the drawn cup is uniformly distributed, the effective hardened layer of heat treatment carburization is deeper, the wear resistance of the drawn cup is good, and the high-temperaturetempering process eliminates the brittleness of the drawn cup and the holder, thereby prolonging the service life of the bearing.
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Description

technical field

[0001] The invention relates to a quenching process, in particular to an overall quenching process for a stamped outer ring needle roller bearing. Background technique

[0002] In the existing technology, the traditional stamping outer ring needle roller bearing processing technology is to quench and temper the outer ring and perform high-frequency annealing at the mouth, and then assemble. In the traditional process, in order to ensure smooth curling, carburizing and effective hardening The layer is shallow, and the surface hardness after the high-frequency annealing of the mouth must be controlled below 500HV. Due to the influence of the high-frequency annealing temperature of the mouth, the surface hardness of the raceway of the outer ring is reduced. Due to the uneven surface hardness distribution of the outer ring, the bearing will fail prematurely during use, reducing the utilization rate. Contents of the invention

[0003] The technical problem to b...

Examples

Embodiment Construction

[0011] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

[0012] The overall quenching process of the present invention includes batching→blanking→stretching→bottom trimming→typing→face splitting→bottom dropping→deburring (polishing)→cleaning and anti-rust→transfer to assembly for anti-rust→needle matching→assembly→curling→transfer to heat treatment →Ultrasonic cleaning→drying→quenching→cleaning→tempering→finishing→transfer assembly→ultrasonic cleaning→shaping→demagnetization→ultrasonic cleaning→finished product inspection→drying→grease injection→rust prevention→packaging→warehousing, of which:

[0013] Hemming: It is the hemming after assembling the needle roller, the outer ring and...