Toughness reading of CBN tools
Undoubtedly, CBN tools are currently the best tooling material for ferrous metal processing. And with the advancement of research, CBN tools are suitable for the processing of various high-hardness and complex materials. The newly developed CBN tool grade of Hualing HLCBN can process tungsten carbide with hardness above HRC70, which is the first case in China. At the same time, however, it is an indisputable fact that CBN tools are more brittle than carbide tools. So how to strengthen the toughness of CBN tools, how to use reliable toughness to ensure the economical use? This is also one of the most concerned issues for tool users.
I. Factors affecting the toughness of CBN tools
1, the purity of raw materials and reasonable particle size configuration is the most basic guarantee of the toughness of CBN tools, no longer repeat them here. (See the production and manufacturing methods of cubic boron nitride tools for details)
2, tool negative chamfering and edge micro-processing: measured When the CBN tool's chamfer angle changes from -5 ° to -20 °, the cutting force first decreases and then slightly increases, and the cutting force is direct Tested the toughness of the tool. Valin Superhard believes that although the width and angle of the chamfer increase, it is beneficial to increase the toughness of the CBN tool, but it cannot be generalized; the specific processing materials are different (the shape of the iron filings is different from the cutting force), and the machining allowance The amount of cutting, etc. all affect the microscopic change of the negative chamfer to the toughness of the tool. Hualing superhard will generally be selected according to the user's specific processing conditions, which is impossible for foreign superhard tool manufacturers. Of course, how to improve the toughness of CBN tools is also verified from the above two points, the first of which directly determines the toughness gradient of CBN tools.
Second, the case of the toughness of CBN tools in use
1. Take Hualing superhard BN-S10 grade as an example. It can not only cut hardened steel intermittently, but also remove the hardened layer of the workpiece with a large margin, but the premise is that it does not sacrifice the wear resistance of the cutter. The biggest difference from the CBN tools on the market, "the perfect balance between wear resistance and impact resistance" is one of the reasons why the HLCBN brand stands in the world's superhard tool industry.
2, the dialectic of the tool's toughness and wear resistance. In the machining process, the increase of the tool cost caused by blade chipping and chipping is a problem that cannot be ignored, but the blade chipping is not necessarily the poor toughness of the blade, or it may be Insufficient wear resistance of the tool, (see "Life and wear resistance of cubic boron nitride inserts" for reasons)
Summary: CBN tool as a brittle superhard tool material, toughness is its most basic guarantee, but we can not lose its superhard material properties - wear resistance, as a superhard material because of its pursuit of its toughness. We should reflect on the summary and avoid moving the superhard tool research to the other extreme. (Zhengzhou Hualing Superhard Materials Co., Ltd. CBN Tool Development Department, 2011 draft)
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