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Alloy grinding ball and production method thereof

A production method and technology of grinding balls, which are applied in the field of grinding media, can solve problems such as increased broken ball rate, matrix splitting, and uneven distribution, and achieve the effects of improving product toughness and hardness, reducing heat treatment temperature, and reducing production costs

Inactive Publication Date: 2012-11-14
GUIZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the existing grinding balls generally have problems such as coarse metal crystal particles, uneven distribution, many types of carbides, and the matrix is ​​split by carbides, etc., resulting in high production costs, poor toughness, low hardness, and large wear of grinding balls.
Moreover, the wear resistance difference between the surface layer and the inside of the grinding ball is relatively large, so that the rate of diameter reduction during the wear process is unbalanced, and it is easy to form invalid balls, and the broken ball rate increases accordingly, resulting in an increase in ball consumption and power consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Make alloy grinding balls with the following components in weight percent:

[0018] C: 3.2, Cr: 11, W: 1.8, Si: 1.2, Mn: 1.4, P: 0.09, S: 0.1, yttrium-based heavy rare earth: 0.6, and the rest is Fe.

[0019] Its production method is as follows:

[0020] Using scrap steel and high-carbon ferrochromium as the main raw materials, adding tungsten, and no longer adding precious metals such as molybdenum, nickel, copper, etc., mainly forming Cr 7 C 3 , WC-based carbides to improve the hardness and toughness of the material. In addition, yttrium-based heavy rare earths are used to modify the molten iron to refine the grains, break the carbides, reduce the splitting of the carbides on the matrix, and reduce the segregation of chemical components. ; Optimize the heat treatment process, promote the heat treatment granulation of eutectic carbides, and use oil quenching for forced cycle heat treatment, which improves the toughness, hardness and wear resistance of the product.

...

Embodiment 2

[0025] Make alloy grinding balls with the following components in weight percent:

[0026] C: 2.1, Cr: 13, W: 0.9, Si: 1.1, Mn: 1.3, P: 0.07, S: 0.08, yttrium-based heavy rare earth: 0.4, and the rest is Fe.

[0027] Its production method is as follows:

[0028] Using scrap steel and high-carbon ferrochromium as the main raw materials, adding tungsten, and no longer adding precious metals such as molybdenum, nickel, copper, etc., mainly forming Cr 7 C 3 , WC-based carbides to improve the hardness and toughness of the material. In addition, yttrium-based heavy rare earths are used to modify the molten iron to refine the grains, break the carbides, reduce the splitting of the carbides on the matrix, and reduce the segregation of chemical components. ; Optimize the heat treatment process, promote the heat treatment granulation of eutectic carbides, and use oil quenching for forced cycle heat treatment, which improves the toughness, hardness and wear resistance of the product. ...

Embodiment 3

[0033] Make alloy grinding balls with the following components in weight percent:

[0034] C: 3.3, Cr: 10, W: 0.6, Si: 1.0, Mn: 1.1, P: 0.05, S: 0.07, yttrium-based heavy rare earth: 0.5, and the rest is Fe.

[0035] Its production method is as follows:

[0036] Using scrap steel and high-carbon ferrochromium as the main raw materials, adding tungsten, and no longer adding precious metals such as molybdenum, nickel, copper, etc., mainly forming Cr 7 C 3 , WC-based carbides to improve the hardness and toughness of the material. In addition, yttrium-based heavy rare earths are used to modify the molten iron to refine the grains, break the carbides, reduce the splitting of the carbides on the matrix, and reduce the segregation of chemical components. ; Optimize the heat treatment process, promote the heat treatment granulation of eutectic carbides, and use oil quenching for forced cycle heat treatment, which improves the toughness, hardness and wear resistance of the product. ...

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PUM

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Abstract

The invention discloses an alloy grinding ball and a production method thereof. Through reasonably adjusting composition proportion, waste steel and high carbon ferro-chrome are taken as main raw materials, tungsten is added, noble metals, such as molybdenum, nickel, copper and the like are not added, carbides taking Cr7C3 and WC as main principle is mainly formed so as to improve hardness and toughness of the material, in addition, yttrium-based heavy rare earth is used for discharge molten steel so as to carry out modification for refining grain, crushing the carbides, reducing split of the carbides on a substrate and decreasing segregation of chemical compositions; a thermal treatment process is optimized, heat treatment granulation of eutectic carbides is promoted, oil quenching is used for carrying out forced circulating heat treatment, toughness, hardness and wear resistance of the product are improved, the heat treatment temperature is reduced, the electric energy is saved, and the production cost is reduced.

Description

technical field [0001] The invention relates to a grinding medium, in particular to an alloy grinding ball and a production method thereof. Background technique [0002] Grinding ball is a commonly used grinding body, its function is to grind massive ore, metal and coal into particles or powder. Because the existing grinding balls generally have problems such as coarse metal crystal particles, uneven distribution, many types of carbides, and the matrix is ​​split by carbides, etc., resulting in high production costs, poor toughness, low hardness, and large wear of grinding balls. Moreover, the wear resistance difference between the surface layer and the inside of the grinding ball is large, so that the rate of diameter reduction during the wear process is unbalanced, and it is easy to form a failed ball, and the rate of broken balls increases accordingly, resulting in an increase in ball consumption and power consumption. Contents of the invention [0003] In view of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/36C22C37/06C22C33/04C22C33/08B02C17/20
Inventor 庞礼军
Owner GUIZHOU NORMAL UNIVERSITY
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