A kind of method for preparing superhard small grinding head

Abstract

The invention provides a method for preparing a superhard small grinding head, comprising the steps of: prefabricating, first mixing and stirring superhard abrasive, vitrified bond, pore-forming agent, whiskers, polyvinyl alcohol and water to form a gel slurry, and then pouring the gel slurry into a gypsum mold and standing still to obtain a prefabricated body of a small grinding head; sintering the prefabricated body of a small grinding head at 100°C to 700°C under normal pressure to sinter the prefabricated body of a small grinding head to produce Obtain the sintered body of the small grinding head; cut the finished product by using a laser to cut the sintered body of the small grinding head into a semi-finished small grinding head of a predetermined size and cut out a small grinding head handle connecting hole on the semi-finished small grinding head. The superhard small grinding head is made by the above method, so the superhard small grinding head manufactured by the above method provided by the present invention not only has uniform abrasive distribution, but also has controllable size and simple operation, and is suitable for the manufacture of superhard tools. Precise trimming in process.

Description

technical field [0001] The invention relates to the technical field of abrasive tool processing, in particular to a method for preparing a superhard small grinding head. Background technique [0002] During the manufacturing process of superhard tools, there are appearance defects that do not affect the use, such as small protrusions or small area scratches on the appearance, etc., which are not suitable for large-scale repairing at this time; or during the manufacturing process of superhard tools, due to local Processing defects cannot be repaired in a large area, or large-area repairs still cannot meet the processing requirements. Due to its small size, the small grinding head can even be as small as 2mm, which can be used to repair the appearance defects of the workpiece or the above-mentioned local processing defects that do not affect the use. However, in the production process of superhard tools, due to the low hardness of ordinary small grinding heads, superhard mate...

AI Technical Summary

Problems solved by technology

However, in the production process of superhard tools, due to the low hardness of ordinary small grinding heads, superhard materials cannot be trimmed, and superhard small grinding heads with higher hardness are needed to trim superhard materials such as diamond and cubic boron nitride.

[0003] The existing superhard small grinding head is mainly prepared by electroplating, but the superhard abrasive on the superhard small grinding head prepared by the electroplating method is in a suspended state during the electroplating process, and its concentration on the basic surface of the small grinding head cannot be controlled. In addition, the superhard abrasive can not be deposited evenly on the basic surface, so that the superhard abrasive can not be evenly distributed on the substrate. When the small electroplated grinding head is used to repair the superhard tool, it is impossible to apply uniform force to the superhard tool, and thus cannot Repair the above-mentioned defects of the superhard tool; the defect of the superhard tool cannot be repaired and usually can only be discarded, which increases the production cost of the superhard tool

[0004] In addition, for the superhard small grinding head prepared by electroplating, the superhard abrasive uses a metal bond, and the strength of the metal bond is limited. At the same time, the thickness of the superhard abrasive deposited on the substrate is relatively small, so the prepared superhard small The strength of the abrasive on the grinding head is limited. If the size of the superhard small grinding head is relatively small, its strength will be low and cannot be used to repair superhard tools. Therefore, the size of the superhard small grinding head prepared by electroplating method cannot be made smaller.