The preparation of two-color coated carbide inserts was tested on a wet blasting machine, and the effects of sand size, air pressure, sand pump frequency and mortar concentration on the processing process indicators were explored, and the process parameters with good process indicators were obtained; and the advantages of the two-color coated carbide inserts prepared by the wet sand blasting process with improved tool wear state were verified by test cutting. The results show that the reasonable choice of wet blast process parameters can make two-color coated carbide inserts with good cutting performance.
Cemented carbide coated inserts are already a mainstream tool in machining, and chemical vapor deposition (CVD) coating technology is more widely used in turning applications because it can provide coatings up to 25 μm thick. In order to further enhance the cutting performance of CVD coatings, post-coating is a reliable way to treat them. According to the data, different post-treatment methods can reduce the surface roughness of CVD coatings and improve their stress and thermal cracking states, thus significantly increasing their machining life. The research of Bouzakis et al. shows that suitable wet sand blasting process parameters can enhance the hardness of PVD coatings and improve the surface quality; Zhong et al. treated CVD coatings by different post-treatment methods such as brush finishing, polishing and wet sand blasting, and found that the products of wet sand blasting and polishing have better processing life. Performance; Liu et al. showed that wet sandblasting of CVD coatings can significantly reduce surface roughness and improve wear resistance through tests.
The two-color coating blade is a common CVD coating post-treatment product on the market. The yellow color on the back side of the blade is used as the wear identification color during processing, while the front side of the blade is obtained by removing the TiN layer after the post-treatment. Therefore, this paper is looking for a production process that can produce these products in volume and that meets the existing coating standards.
The literature shows that the air pressure, abrasive particle size and mortar pressure in the wet blasting process have the most significant influence on the effect of post-coating treatment, so this paper conducts experimental research with specific wet blasting equipment to find out the appropriate process parameters to achieve the required product requirements.
1. test conditions and methods
(1) Test conditions The test object of this paper is the WS8125 brand products produced by Zhuzhou Huarui Precision Tools Co.
The working principle of the machine is to use the negative pressure induced by the high speed flow of compressed air in the spray gun to introduce the sand and water mixed abrasive (sand blasting medium) into the spray gun through the blasting pipe, and then spray it onto the workpiece surface with the airflow at high speed to achieve the processing requirements. The machine is equipped with a set of 4 special blasting gun tubes, Siemens touch panel, adjustable and controllable process parameters, easy to operate, and can meet the use of 80-500 mesh alumina, industrial glass beads.
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