Optimize coatings to help the tool improve competitiveness (2)


Figure 2 Effect of HSS tool coating on deformed debris thickness. Material: 34CrMo 4V, Vc=30m/min, f=0.2mm, ap=2.0mm


There is a misleading discussion in the industry that some coatings have low heat penetration values ​​(similar to the thermal conductivity concept), but the tools do not actually have true thermal protection. This shows that even if the thickness of the coating reaches several micrometers, the cutting edge of the HSS tool is not protected and the heat resistance of the cemented carbide base material has never been reached. However, in practice, when the coated tool is used, a very low temperature is actually measured on the blade (Fig. 3).



Figure 3 Effect of coating on HSS bit temperature Material: 42CrMo 4V, coating: TiN, 2μm, f=0.1mm


The basic function of a wear-resistant coatings action <br> <br> coating is effective protection tool, a tool to suppress withstand a variety of wear. People often say that the harder the better, the higher the hardness of the coating, the better the effect. However, this generally accepted statement is debatable. In general, the hardness of a coating is highly dependent on temperature. Temperatures above 500 ° C (this temperature is easily achieved at the cutting edge), the temperature values ​​of many coating materials are no longer comparable to the test values ​​at room temperature. In addition, once the temperature rises, the particular coating no longer has mechanical stability and begins to oxidize.

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Stepper Motor Peristaltic Pump

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