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Method for preparing mill balls for ball mill

A technology of grinding balls and ball mills, applied in the field of preparation of grinding balls for ball mills, can solve the problems of low material utilization, low production efficiency, poor sphericity, etc., achieve high production efficiency, improve production efficiency, and improve material utilization Effect

Inactive Publication Date: 2011-02-16
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it can only be processed individually, the production efficiency is low, the material utilization rate is low, the cost is high, and the sphericity is not easy to control. For tungsten and molybdenum balls with small diameters, they cannot even be processed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Taking the production of φ5mm molybdenum balls as an example,

[0021] Commercially available molybdenum powder was selected, with a purity of 99.95% and a particle size of 3.8 μm. The binder is PEO, and the solvent is deionized water. First weigh 4% PEO, then add 6% deionized water, heat to 40°C and mix evenly, then gradually add molybdenum powder and keep stirring, and mix in the mixer for 12 hours to form a uniform slurry. The slurry is put into the mold clamping machine for pressing, and in the first and second quantitative cylinders, the mold receiving plate on the disk passes through the first and second quantitative cylinders, the pressing mechanism and the capping device in turn as the disk rotates. , so that the cycle is repeated, and the process of loading and mold closing is completed once per cycle, that is, molybdenum pellets are obtained. This mechanism not only saves manpower, but also increases the efficiency of mold clamping by many times compared wit...

Embodiment 2

[0028] Taking the production of φ8mm molybdenum balls as an example,

[0029] The commercially available molybdenum powder is selected, the purity is 99.95%, the particle size is 2.8 μm, the binder is CMC, and the solvent is deionized water. Firstly, 3% PEO was weighed, and then 5% deionized water was prepared, and a slurry with a certain viscosity was prepared in the same way as in Example 1. Then carry out pressing, and pressing process is identical with embodiment one. After finishing the pressing of the molybdenum powder, slowly raise the temperature to 180°C in a hydrogen-through heating furnace, and degumming for 10 hours. Then pre-sinter at 1100°C for 1 hour, and enter the intermediate frequency sintering furnace for final sintering. The sintering process is as follows:

[0030] Table 1 Sintering Process of φ8mm Molybdenum Balls

[0031] temperature, ℃

[0032] After sintering, the molybdenum balls maintain the original shape, and the sintering density is ...

Embodiment 3

[0034] Taking the production of φ2mm tungsten ball as an example,

[0035] Commercially available tungsten powder was selected, with a purity of 99.9% and a particle size of 4.8 μm. The binder is PVA, and the solvent is deionized water. First weigh 4% PEO, then add 6% deionized water, heat to 60°C and mix well, then gradually add tungsten powder and keep stirring, and mix in the mixer for 12 hours to form a uniform slurry. The slurry is placed in the first and second quantitative cylinders, and the mold receiving plate on the disk passes through the first and second quantitative cylinders, the pressing mechanism and the capping device sequentially as the disk rotates, so that the cycle is repeated. The process of loading and mold closing is completed once in one cycle, and the tungsten ball billet is obtained.

[0036] After finishing the pressing of the tungsten powder, slowly raise the temperature to 200°C in a hydrogen-through heating furnace, degumming for 10 hours, and ...

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Abstract

The invention discloses a method for preparing mill balls for a ball mill and relates to a preparation method for near net shaping of molybdenum, tungsten and molybdenum-tungsten alloy balls. The method is characterized in that: the mill balls are prepared by a powder metallurgy method for near net shaping in a preparation process. The method comprises the following steps of: adding a binding agent and water into molybdenum and tungsten powder serving as raw materials, pressing the mixture with a charging die spotting machine; and degumming and sintering the product to obtain molybdenum and tungsten balls with certain sizes. Compared with a method for machining after forging, the method of the invention does not cause cut scrapes and has high production efficiency, flexible and adjustable diameter of the molybdenum and tungsten balls and obvious cost advantage. The production efficiency is efficiently enhanced; the utilization rate of the materials are improved; the cost is reduced; the ball shape is good; and the mill balls for the ball mills with different specifications can be conveniently and quickly produced.

Description

technical field [0001] The invention discloses a method for preparing a grinding ball for a ball mill, and relates to a method for preparing near-net shapes of molybdenum, tungsten and alloy spheres. Background technique [0002] In the powder metallurgy process, due to the final performance of the product or the needs of the forming process, the powder raw material must undergo some pretreatment, and the most common method of pretreatment is ball milling. Ball milling can improve the particle size distribution of powder and increase the bulk density. Secondly, it can be used to break large agglomerated materials, and even prepare ultra-fine powder materials. Another important use is to produce alloy powder materials by mechanical alloying. All ball milling processes require the matching of balls with different diameters to achieve better results. In addition, in order to avoid pollution to the powder by pretreatment, it is necessary to choose wear-resistant balls without ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F3/24
Inventor 朱琦武洲卜春阳冯鹏发
Owner JINDUICHENG MOLYBDENUM CO LTD
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