A bearing ring blank and its casting-rolling composite process

A technology of bearing rings and composite technology, which is applied in the direction of casting molds, casting mold components, manufacturing tools, etc., can solve the problems of many processing steps of forging blanks, low quality of bearing rings, waste of labor and materials, etc., and achieve the elimination of casting defects , Improve water erosion resistance and improve production efficiency

Active Publication Date: 2017-11-17
HUBEI XINHAIHONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cold rolling method is to use the forging billet to carry out rolling at room temperature. Although the quality of this method is easy to guarantee, it requires a large rolling force and is only suitable for the processing of small rings.
The relative hot rolling method is often used in the production of large rings, but for the production of large rings, due to the use of hot rolling forgings, descaling and punching are required, and the machining allowance is large, resulting in waste of labor and materials
[0003] At present, the bearing industry mostly uses 42CrMo steel ring forgings as the blank for extra-large bearing rings. The processing process of bearing ring forgings is: steelmaking-ingot-cutting the cap and tail of the ingot-ingot heating-forging-upsetting Cake-expanding-secondary heating and rolling, the processing steps of the forging blank are many, the cost is high, and the quality of the prepared bearing ring is low, and the performance is poor. Develop a bearing ring blank and its preparation method that can overcome the above defects Known as a technical problem to be solved urgently by those skilled in the art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a bearing ring blank. The bearing ring blank is composed of: C: 0.40%, Mn: 1.00%, Si: 0.45%, Cr: 1.25%, Mo: 0.20%, P: 0.05%, Ti: 0.09%, Al: 0.20%, V: 0.20%, Ni: 0.30%, Cu: 0.20%, S: 0.02%, composite rare earth: 0.12%, the balance is Fe; composite rare earth includes by mass percentage The following components: lanthanum: 25%, praseodymium: 16%, dysprosium: 13%, holmium: 6%, gadolinium: 9%, yttrium: 9%, cerium: 9%, neodymium: 8%, europium: 5%.

[0038] The casting and rolling composite process of the bearing ring blank has the following operation steps:

[0039] (1) Use molding sand to make mixed molds, and send the molds to an oven for drying at 210°C for later use;

[0040] The molding sand includes the following components in terms of mass percentage: water glass 9%, bentonite: 2%, and the rest is quartz sand; place the quartz sand in a sand mixer and then add bentonite for mixing, dry mix for 9 minutes, then add water glass, continue Mix for ...

Embodiment 2

[0049] This embodiment provides a bearing ring blank. The bearing ring blank is composed of: C: 0.45%, Mn: 0.80%, Si: 0.35%, Cr: 1.00%, Mo: 0.25%, P: 0.04%, Ti: 0.08%, Al: 0.23%, V: 0.10%, Ni: 0.20%, Cu: 0.15%, S: 0.01%, composite rare earth: 0.14%, and the balance is Fe;

[0050] The compound rare earth includes the following components by mass percentage: lanthanum: 25%, praseodymium: 18%, dysprosium: 11%, holmium: 7%, gadolinium: 8%, yttrium: 8%, cerium: 8%, neodymium: 8%, Europium: 7%.

[0051] The casting and rolling composite process of the bearing ring blank has the following operation steps:

[0052] (1) Use molding sand to make mixed molds, and send the molds to an oven for drying at 200°C for later use;

[0053] The molding sand includes the following components in terms of mass percentage: water glass 11%, bentonite: 1%, and the rest is quartz sand; place the quartz sand in a sand mixer and then add bentonite for mixing, dry mix for 11 minutes, then add water glas...

Embodiment 3

[0062] This embodiment provides a bearing ring blank. The bearing ring blank is composed of: C: 0.42%, Mn: 0.9%, Si: 0.55%, Cr: 0.95%, Mo: 0.30%, P: 0.03%, Ti: 0.10%, Al: 0.21%, V: 0.15%, Ni: 0.15%, Cu: 0.25%, S: 0.015%, composite rare earth: 0.13%, and the balance is Fe;

[0063] The compound rare earth includes the following components by mass percentage: lanthanum: 30%, praseodymium: 15%, dysprosium: 11%, holmium: 5%, gadolinium: 8%, yttrium: 8%, cerium: 8%, neodymium: 7%, Europium: 8%.

[0064] The casting and rolling composite process of the bearing ring blank has the following operation steps:

[0065] (1) Use molding sand to make mixed molds, and send the molds to an oven for drying at 205°C for later use;

[0066] The molding sand includes the following components in terms of mass percentage: water glass 8%, bentonite: 2%, and the rest is quartz sand; place the quartz sand in a sand mixer and then add bentonite for mixing, dry mix for 10 minutes, then add water glass...

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PUM

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Abstract

The invention discloses a bearing ring blank. The bearing ring blank is composed of: C: 0.40-0.45%, Mn: 0.80-1.00%, Si: 0.35-0.55%, Cr: 0.95-1.25%. , Mo: 0.20‑0.30%, P: 0.03‑0.05%, Ti: 0.08‑0.10%, Al: 0.20‑0.23%, V: 0.10‑0.20%, Ni≤0.30%, Cu≤0.25%, S≤0.02% , composite rare earth: 0.12-0.14%, the balance is Fe; the present invention also designs a casting-rolling composite process flow of a bearing ring blank as smelting-casting-rolling-normalizing-quenching-tempering-turning; the bearing The ferrule blank has high mechanical properties and high quality, and the casting-rolling composite process reduces the processing procedure of the blank and reduces the production cost.

Description

technical field [0001] The invention relates to a casting-rolling composite process for metal products, in particular to a casting-rolling composite process for a bearing ring blank. Background technique [0002] At present, there are two commonly used methods for producing high-quality bearing rings and other ring parts: cold rolling and hot rolling. The cold rolling method is to use the forging billet to carry out rolling at room temperature. Although the quality of this method is easy to guarantee, it requires a large rolling force and is only suitable for the processing of small rings. The relative hot rolling method is often used in the production of large rings, but for the production of large rings, due to the use of hot rolling forgings, descaling and punching are required, and the processing allowance is large, resulting in waste of labor and materials . [0003] At present, the bearing industry mostly uses 42CrMo steel ring forgings as the blank for extra-large b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C22C38/50C21D8/00B22C1/18B22C9/02B22D1/00
Inventor 陶明海黄立忠
Owner HUBEI XINHAIHONG CHEM
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