Blank for polishing, method for producing same, and method for producing diamond polishing blank

A manufacturing method and diamond technology, applied in the manufacture of diamond grinding blanks, grinding blanks and their manufacturing fields, can solve problems such as short circuit, magnetic head function failure, etc., reduce defective rate, reduce roughness, and improve cracking phenomenon Effect

Active Publication Date: 2019-05-03
SAE MAGNETICS (HK) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If these scratches pass right through the head, a short circuit will be formed, causing the head to fail

Method used

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  • Blank for polishing, method for producing same, and method for producing diamond polishing blank
  • Blank for polishing, method for producing same, and method for producing diamond polishing blank

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Experimental program
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Embodiment Construction

[0025] Several different preferred embodiments of the present invention will now be described with reference to the accompanying drawings, wherein like reference numerals in different drawings represent like parts. As mentioned above, the essence of the present invention is to provide a blank for grinding, a diamond grinding blank, which can enhance the diamond particles embedded in it more firmly, and the cracking of the blank during the grinding process is improved, thereby reducing the abrasiveness of the abrasive. defective rate.

[0026] In the present invention, the grinding blank is especially suitable for the grinding process in the manufacturing process of the magnetic head, for example, grinding the elongated bar with a plurality of magnetic head bodies. As an improvement, lead is added to the blank, the content of lead is less than 1% of the total mass of the blank, and the performance of the blank can be greatly improved with the optimized content ratio.

[0027] ...

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Abstract

A blank for grinding comprises a blank body and lead, and the content of the lead is smaller than 1% of the total mass of the blank body. The manufacturing method of the green body comprises the following steps: sequentially adding a blank and lead into an electric furnace for melting, wherein the content of the lead is less than 1% of the total mass of the green body; pouring the molten liquid ofthe blank and the lead into a blank mold, and cooling and molding to form a blank body; and annealing the green body. According to the diamond grinding wheel, the firmness degree of the diamond particles embedded into the diamond grinding wheel can be improved, the blank cracking phenomenon in the grinding process is improved, and therefore the defective rate of ground objects is reduced.

Description

technical field [0001] The invention relates to abrasive materials, in particular to a blank for grinding, a manufacturing method thereof, and a manufacturing method of a diamond grinding blank. Background technique [0002] Disk drives (HDDs) are commonly used information storage devices. As the recording density of HDD increases, there is an urgent need to improve the performance of the magnetic head and the magnetic recording medium. In the HDD, the magnetic head embedded in the slider flies over the surface of the magnetic recording medium to read and write data. [0003] Currently, tunneling magnetoresistive heads (TMR) have been widely used instead of giant magnetoresistive heads (GMR) due to their excellent sensitivity, and their magnetoresistance is usually 400-1000 ohms. Compared with GMR, TMR has two significant differences in structure. One is that the working current passes through the direction perpendicular to each layer of the read head, and the other is to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/127
Inventor 藤井隆司陈世雄齐斌廖德英
Owner SAE MAGNETICS (HK) LTD
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