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Processing technique of 9Cr18 stainless steel capable of being improved to G3 level

A 9cr18, stainless steel technology, applied in the field of 9Cr18 stainless steel ball processing technology, can solve problems such as not being able to meet the use requirements

Inactive Publication Date: 2008-05-28
LUOYANG BEARING SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the material characteristics of bearing steel GCr15, it cannot meet the requirements of aviation, aerospace, special fields, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] For example, the processing technology of Φ3.175 G3 grade 9Cr18 stainless steel balls for a high-precision bearing is as follows:

[0043] I. First conduct raw material inspection according to the national standard of 9Cr18 stainless steel material and the national standard of 9Cr18 stainless steel material for special fields.

[0044] II. On the high-speed steel ball cold heading machine, adopt the steel ball cold heading mold of the corresponding specification, the knife plate upsetting ball, and the upsetting ball punches 250 times / min.

[0045] III. Stress relief annealing in the box-type electric furnace H-45, the annealing temperature is 600-650°C, and the annealing time is 4-6 hours.

[0046] IV. Hot pickling

[0047] i. The components of the acid liquid are calculated by volume ratio: HCL50%, HCl 2 O50%;

[0048] ii. Pickling equipment: pickling tank, electric furnace;

[0049] iii. Pickling temperature: 60±5°C; pickling time: 10-30 minutes.

[0050] V. Put...

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Abstract

The invention relates to a 9Cr18 stainless steel ball processing technique which can be raised to G3 grade. The processing technique sequentially includes raw material inspection, ball-forging, stress-relief and anneal, hot-acid pickling, polishing, quenching plus cold treatment plus backfire, hard milling, a first-time stabilizing treatment, fine milling, a second-time stabilizing treatment, fine grinding, washing, fine appearance-forming and lubricating and packing. On a basis of making a full use of the existing steel ball processing technology, machine-tool equipments and testing equipments, the technique of the invention adopts a reinforced steel ball manufacturing equipment, industrial preparations, and a novel abrasive to optimize various machining process parameters in the steel ball processing technique and to strengthen a process quality testing and has a proper washing, packing and conserving proposals, etc. process technology. The invention can raise the precision grade of the stainless steel ball to G3 grade and solves the processing technology, testing control and finished-product washing of the 9Cr18 stainless steel ball, and then a batch manufacture is realized finally.

Description

technical field [0001] The invention belongs to the technical field of machining, and in particular relates to a 9Cr18 stainless steel ball processing technology which can be improved to G3 level. Background technique [0002] Steel balls are used as rolling elements in ball bearings to carry and transmit loads. The compressive stress per unit area is very large, and the force frequency is also high, which is easy to cause fatigue damage; at the same time, in bearings that require vibration or noise , the precision of the steel ball has the greatest influence on the vibration or noise of the bearing. [0003] All kinds of 9Cr18 stainless steel bearings and steel balls have been widely used in aviation, aerospace, special fields, etc. 9Cr18 stainless steel bearings and steel balls have a wide range of demands. High-precision 9Cr18 stainless steel balls are produced by only a few manufacturers in China, and there is no manufacturer that can stably reach the G3 level and produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B24B11/02B23P25/00
Inventor 张永乾陈志军王利军张利娟聂利达肖永伟孟丽萍
Owner LUOYANG BEARING SCI & TECH CO LTD
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