cBN Sintered Material Composition for High-Speed Tool Wear Control
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Solution Overview
Problem
Conventional cubic boron nitride sintered materials exhibit insufficient thermal conductivity, leading to increased temperature at the tool-workpiece interface during high-speed processing of sintered alloys, resulting in reduced tool life due to wear and breakage.
Innovation Solution
A cubic boron nitride sintered material with a high volume percentage of cBN grains (>80%) and a binder phase containing elements like aluminum, silicon, cobalt, and nickel, along with a dislocation density of cBN grains between 1×10^15/m² and 1×10^17/m², which enhances thermal conductivity and binding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional binder phases are used to maintain binding strength, then thermal conductivity decreases, but high thermal conductivity is needed to reduce temperature at the tool-workpiece interface
Solution Approach 1:
The invention introduces specific elements (Al, Si, and group 4-6 elements) in the binder phase that have high thermal conductivity. By controlling the content ratios of these elements and their compounds, the thermal conductivity parameter of the binder phase is optimized while maintaining adequate binding strength through the composite structure.
2Productivity
If high-speed processing is performed to increase productivity, then temperature at the tool-workpiece interface increases, but this accelerates wear and reduces tool life
Solution Approach 1:
The invention optimizes the thermal parameters of the sintered material by incorporating elements with high thermal conductivity in the binder phase. This allows heat to be conducted away from the tool-workpiece interface more efficiently, enabling high-speed processing without excessive temperature buildup that would cause wear.
Data Source
AI summary
A cubic boron nitride sintered material includes: more than 80 volume % and less than 100 volume % of cubic boron nitride grains; and more than 0 volume % and less than 20 volume % of a binder phase. The binder phase includes: at least one selected from a group consisting of a simple substance, an alloy, and an intermetallic compound selected from a group consisting of a group 4 element, a group 5 element, a group 6 element in a periodic table, aluminum, silicon, cobalt, and nickel. A dislocation density of the cubic boron nitride grains is more than or equal to 1×1015/m2 and less than or equal to 1×1017/m2.