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Forging method for reducing proportion of tiny crack defects of bearing

A technology of tiny cracks and defects, applied in the field of bearing forging, can solve the problems of easy defects in forgings and the influence of changes in the streamline of the material section, and achieve the effects of deformation coordination, improving reliability and increasing the pass rate.

Inactive Publication Date: 2016-01-06
AVIC HARBIN BEARING
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  • Application Information

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Problems solved by technology

[0006] In order to solve the problem that the mold used in the existing high-performance bearing forging process has an influence on the streamline change of the material section, and defects are easily generated inside the forging, a forging method for reducing the proportion of small crack defects in the bearing is proposed

Method used

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  • Forging method for reducing proportion of tiny crack defects of bearing
  • Forging method for reducing proportion of tiny crack defects of bearing
  • Forging method for reducing proportion of tiny crack defects of bearing

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specific Embodiment approach 1

[0021] Specific implementation mode one: combine figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 To illustrate this embodiment, a forging method for reducing the proportion of bearing micro-crack defects described in this embodiment is a free punching method without a die, which is specifically carried out according to the following steps:

[0022] Step 1. Upsetting the material section: use a 450Kg air hammer to hammer the material section, and the number of hammering times is 10 to 22 times;

[0023] Step 2, one-sided flushing: perform one-sided flushing on the hammered forging;

[0024] Step 3. Repeated flushing: carry out flushing on the corresponding surface of the forging that has undergone single-sided flushing in step 2, and repeat the operations of steps 2 and 3 for 2 to 3 times;

[0025] Step 4. Rolling: Before rolling, preheat the rolling wheel. After the temperature of the rolling wheel reaches 150-200°C, roll the forging that has undergone repeated...

specific Embodiment approach 2

[0027] Specific embodiment 2: In step 1 of this embodiment, the number of times of hammering is 15-20 times. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0028] Specific implementation mode three: In the step one described in this implementation mode, the number of hammering times is 18 times. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a forging method for reducing the proportion of tiny crack defects of a bearing. The forging method aims at solving the problems that a die used in an existing high-performance bearing forging technology influences changes of a streamline of a material section, and defects are likely to occur in a forged part. The forging method specifically comprises the following steps that firstly, the material section is upset, wherein the material section is thumped by a 450Kg air hammer, and the number of thumping times ranges from 10 to 22; secondly, single-face stamping expansion is carried out, wherein the thumped forged piece is subjected to single-face stamping expansion; thirdly, stamping expansion is carried out repeatedly, wherein the corresponding face of the forced piece obtained through single-face stamping expansion in the second step is subjected to stamping expansion, and the operation in the second step and the operation in the third step are repeated 2-3 times; fourthly, rolling expansion is carried out, wherein before rolling expansion is carried out, a rolling expansion wheel is preheated, and the forged piece obtained after repeated stamping expansion is subjected to rolling expansion after the temperature of the rolling expansion wheel reaches 150-200 DEG C. The forging method is used for the field of bearings.

Description

technical field [0001] The invention relates to a forging method for a bearing, in particular to a forging method for reducing the proportion of tiny crack defects in the bearing. Background technique [0002] High-performance engine main shaft bearings, the ring raceway spalling fault occurred continuously during use, and many small crack defects were found on the outer diameter of the ring and the subsurface of the raceway, as shown in the attached drawing Figure 6 and Figure 7 The topography of the defect. During the polishing analysis of the faulty part, many tiny cracks and hole defects were found on the outer diameter of the ring and the position of the raceway. After a large number of analysis and test verification, it was finally confirmed that the defect was produced during the forging process of the ring forging. The occurrence of defects is related to the following factors: [0003] 1. The use of molds in the forging process has an impact on the streamline cha...

Claims

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Application Information

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IPC IPC(8): B21K1/04B21J5/08B21J5/10B21J7/24B21K29/00
CPCB21K1/04B21J5/08B21J5/10B21J7/24B21K29/00
Inventor 赵燕葛泉江何金光赵开礼马芳兴长喜李潮丹孙东张静静公平
Owner AVIC HARBIN BEARING
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