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Production process of seamless steel pipe for high-performance bearing ring

A technology for seamless steel pipes and bearing rings, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of uneven distribution, large carbide size, and low fatigue life of seamless steel pipes, and achieve uniform carbide distribution, The effect of easy operation control

Pending Publication Date: 2022-04-29
NORTHWESTERN POLYTECHNICAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the deficiencies existing in the prior art, the object of the present invention is to provide a production process of seamless steel pipes for high-performance bearing rings, so as to solve the problems in the prior art that the carbides in the prepared seamless steel pipes are relatively large in size. And uneven distribution leads to the problem of low fatigue life of seamless steel pipes

Method used

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  • Production process of seamless steel pipe for high-performance bearing ring
  • Production process of seamless steel pipe for high-performance bearing ring
  • Production process of seamless steel pipe for high-performance bearing ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Step S1, deformation tool design and determination of deformation parameters:

[0056] Using finite element simulation, establish a finite element model of seamless steel pipe rolling, and set the forming conditions as follows: the circumferential torsion angle at any point in the deformation zone is not less than 50°, and the forging ratio during deformation is not less than 6;

[0057] Determine the shape of the roll and the plug, the radius of the roll surface, the cone angle of the roll surface α, the feed angle β, the rolling angle γ, the roll distance, and the extension of the plug; if the shape and deformation parameters of the deformation tool are determined, the blank’s If the circumferential torsion angle and forging ratio meet the forming conditions, proceed to the next step. If not, repeat the previous steps until the forming conditions are met;

[0058] The main deformation parameters are bearing steel GCr15, with a diameter of 90mm and a length of 600mm. T...

Embodiment 2

[0069] Step S1, deformation tool design and determination of deformation parameters:

[0070] Using finite element simulation, a finite element model of seamless steel pipe rolling is established, and the forming conditions are set as follows: the circumferential torsion angle at any point in the deformation zone is not less than 60°, and the forging ratio during deformation is not less than 7;

[0071] Determine the shape of the roll and the plug, the radius of the roll surface, the cone angle of the roll surface α, the feed angle β, the rolling angle γ, the roll distance and the extension of the plug. If the shape of the deformation tool and the deformation parameters are determined, the circumferential torsion angle of the blank and the forging ratio meet the forming conditions, then proceed to the next step, if not, repeat the previous steps until the forming conditions are met;

[0072] The main deformation parameters are bearing steel 8Cr4Mo4V, with a diameter of 80mm an...

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Abstract

The invention discloses a production process of a seamless steel pipe for a high-performance bearing ring. The production process comprises the following steps of design of a deformation tool, determination of deformation parameters, machining of the deformation tool, installation and debugging, adjustment of the deformation parameters and heating rolling forming. Compared with the prior art, two-phase region temperature rolling is matched with a PTR rotary rolling technology, so that the size of carbides in steel can be effectively reduced, the grain size is refined, the carbides are uniformly distributed in the steel, the obdurability of the seamless steel pipe is remarkably improved, and the fatigue life of the seamless steel pipe is remarkably prolonged; and secondary growth of carbides in the cooling process after rolling can be controlled through low-temperature rolling. And the PTR process is adopted, and the effect that multi-pass repeated deformation is needed to refine carbides and crystal grains in traditional forging and pressing is avoided.

Description

technical field [0001] The invention relates to the technical field of steel pipe production, in particular to a production process of a seamless steel pipe for high-performance bearing rings. Background technique [0002] The bearing ring is an annular part of a radial rolling bearing with one or several raceways. Common high-performance bearings such as wind power bearings, aviation bearings, mechanical bearings, etc. are special bearings, which are used in harsh environments and require high maintenance costs. High service life is required, and some bearings work under ultra-high speed, high load, high temperature and other harsh working conditions for a long time. [0003] For the bearing rings used in the above-mentioned high-performance bearings, the performance and structure requirements are relatively high, and the traditional production technologies of bearing rings are forging and cross-rolling and piercing. Among them, the forging process is: blanking—box furnace...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B19/06C21D1/26C21D8/10C21D9/08
CPCB21B19/06C21D1/26C21D8/105C21D9/08
Inventor 刘东王建国罗远
Owner NORTHWESTERN POLYTECHNICAL UNIV
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