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Manufacturing method for large hollow grinding ball

A manufacturing method and hollow technology, applied in the field of metal wear-resistant materials, can solve the problems of cracks and slag holes on the surface, and achieve the effect of avoiding product defects and reducing the probability of product defects.

Active Publication Date: 2017-04-26
马鞍山市海天重工科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of existing large-scale hollow grinding balls that are prone to product defects such as cracks and slag holes on the surface during the casting process, and to provide a manufacturing method for large-scale hollow grinding balls, which can control the surface defects of grinding balls Remarkable effect

Method used

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  • Manufacturing method for large hollow grinding ball
  • Manufacturing method for large hollow grinding ball
  • Manufacturing method for large hollow grinding ball

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Embodiment 1

[0045] refer to Figure 1~3 , the manufacturing method of the large-scale hollow grinding ball of the present embodiment includes the following steps: the first step: preparation and assembly of the pattern; the second step: coating the coating; the third step: modeling; the fourth step: melting and pouring; Step five: heat treatment.

[0046] Among them, in the first step: use one-sixth of the hemisphere to make a foam pattern foaming mold, then assemble the six pieces of pattern into a hemisphere, and finally assemble the two hemispheres to form a foam plastic pattern of a hollow grinding ball;

[0047] In the second step: the assembled foam plastic pattern is coated with water-based zircon powder paint, and the thickness of the paint is 1mm;

[0048]In the third step: put the dried foamed plastic pattern into the sand box, and vibrate and add sand on the vibrating unit;

[0049] The specific vibration Gaza process is as follows:

[0050] Stage 1: Adjust the vibration fre...

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Abstract

The invention discloses a manufacturing method for a large hollow grinding ball and belongs to the field of metal abrasion-resistant materials. The manufacturing method for the large hollow grinding ball comprises the following steps of 1, mold preparation and assembly, 2, coating smearing, 3, molding, 4, melting and pouring and 5, heat treatment. In the fourth step, the temperature of the cleaned cast steel hollow grinding ball is controlled to be maintained at 200 DEG C or above; in the fifth step, cast steel hollow grinding ball with the temperature being maintained at 200 DEG C or above is placed in a heating furnace with the initial temperature being 200-250 DEG C, the temperature is raised for 5 hours to 395-405 DEG C, heat preservation is conducted for 2 hours, then the temperature is raised for 7 hours to 675-685 DEG C, heat preservation is conducted for 3 hours, the temperature is raised for 2.5 hours to 845-855 DEG C, and the grinding ball is discharged out of the furnace for air cooling after heat preservation for 6 hours and subjected to tempering after being cooled to the room temperature. The manufacturing method has the remarkable control effect on the grinding ball surface defects.

Description

technical field [0001] The invention relates to the field of metal wear-resistant materials, and more specifically, relates to a manufacturing method of a large hollow grinding ball. Background technique [0002] The main grinding principle of the medium-speed mill is that the grinding balls roll between the upper and lower grinding rings to crush the minerals entering the grinding channel. The grinding balls and grinding rings are the main wearing parts, and they are usually placed for 5~ 10 grinding balls, with the enlargement of the equipment, the size of the grinding balls is also larger, the outer diameter is from Φ750mm to Φ1150mm, in order to reduce the weight of this large grinding ball, it is made of hollow balls, the wall thickness is from 135mm to 150mm, and the weight From 1.2 tons to 3.6 tons, and set 5 process holes, the hole diameter is Φ90mm to Φ100mm; because the hollow grinding ball bears a large impact load during operation, CrNiMo cast steel is used as th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/24B22C15/18
CPCB22C9/04B22C9/24B22C15/18
Inventor 孙爱民张颢施懋祥张俊
Owner 马鞍山市海天重工科技发展有限公司
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