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Wind power steel ball billet hot upset forging technology

A technology of steel balls and wind power, which is applied in the direction of improving process efficiency and energy efficiency, and can solve problems such as cracking, high requirements for equipment and molds, and difficulty in guaranteeing the quality of billets

Active Publication Date: 2011-09-21
JIANGSU LIXING GENERAL STEEL BALL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large diameter of the steel ball, if the ball billet is processed by the traditional cold heading forming method, firstly, the requirements for equipment and molds are high; secondly, the quality of the ball billet is difficult to guarantee, and cracking and other defects are prone to occur
However, using the currently commonly used large ball hot rolling forming method to process the billet is prone to defects such as loose cores and cavities, which affect the service life of the steel ball. According to statistics, there are about 3% of defects such as moiré and cavities. If the raw material is loose, the billet is unavoidable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] In this embodiment, the high-carbon chromium bearing steel whose brand name is GCr15 is used as the raw material, and the properties of the steel ball billet produced by the above process are as follows:

[0012] Specification

[0013] It can be seen from the above table that the hardness of HRB92 can be achieved by hot heading treatment; the annealed structure is grade 3, the depth of the decarburization layer is 0.1mm, and there are no defects such as core porosity and voids.

Embodiment 2

[0015] In this embodiment, the high-carbon chromium bearing steel whose brand name is GCr15 is used as the raw material, and the properties of the steel ball billet produced by the above process are as follows:

[0016] Specification

[0017] From the above table, it can be obtained that the hardness can reach HRB92 by hot heading treatment; the annealed structure is grade 3, the depth of decarburization layer is 0.1mm, and there are no defects such as core porosity and voids.

Embodiment 3

[0019] In this embodiment, the high-carbon chromium bearing steel whose brand name is GCr15 is used as the raw material, and the properties of the steel ball billet produced by the above process are as follows:

[0020] Specification

[0021] It can be seen from the above table that the hardness of HRB91 can be achieved by hot heading treatment; the annealed structure is grade 3, the depth of decarburization layer is 0.12mm, and there are no defects such as core porosity and voids.

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PUM

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Abstract

The invention discloses a wind power steel ball billet hot upset forging technology. The technology comprises the following steps: a raw material is rapidly heated through middle frequency induction to 760 DEG C to soften the material, then the heated raw material performs automatic cutting and upsetting to form a ball billet, and the ball billet is finally used to prepare the finished product through ball annealing. The invention has the following advantages: in the technology, the raw material performs high temperature softening, then hot upset forging and forming are performed, finally ball annealing is performed, the hardness of the prepared ball billet is HRB88-94; and the annealing organization is in grade 2-4, the depth of the decarburization layer is less than 0.3mm, and the defects of hot rolling such as loose center and cavities of the ball billet can be overcome.

Description

technical field [0001] The invention relates to a manufacturing process of steel balls, in particular to a process of heating raw materials by adopting a heat treatment process, and then manufacturing steel ball blanks; the steel ball blanks produced by the process have the characteristics of good performance stability. Background technique [0002] At present, the steel balls for wind power generation that are urgently needed in China are large-scale special steel balls above φ30mm. Due to the large diameter of the steel ball, if the traditional cold heading forming method is used to process the billet, firstly, the requirements for equipment and molds are high; secondly, the quality of the billet is difficult to guarantee, and cracks and other defects are prone to occur. However, using the currently commonly used large ball hot rolling forming method to process the billet is prone to defects such as loose cores and cavities, which affect the service life of the steel ball....

Claims

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Application Information

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IPC IPC(8): C21D1/42C21D1/32
CPCY02P10/25
Inventor 马林张达清沈义宏朱明清何福艮贲志山
Owner JIANGSU LIXING GENERAL STEEL BALL