硬质合金刀具车削GH2132高温合金磨损及破损试验

用不同含钴量的超细晶WC-Co硬质合金刀具与普通WC-Co硬质合金刀具对GH2132高温合金进行高速连续切削刀具寿命及断续切削刀具破损的对比试验. 用最小二乘法进行线性回归,建立了刀具寿命与切削速度之间关系的T-v经验公式,用ZEISS体视显微镜及显微摄影系统观察了刀具刃口、前刀面和后刀面的磨损和破损形貌. 试验结果表明:WC-Co硬质合金刀具的磨损和破损的主要机制是黏接磨损;超细晶WC-Co硬质合金刀具的耐磨性明显高于普通硬质合金;适当增加钴黏接相含量有助于超细晶WC-Co硬质合金刀具获得最佳的耐磨损和抗破损性能. 

Wear and Breakage Lifespan Study of Ultrafine-Grained Hardmetals Tool for Turning GH2132 Superalloy

Continuous cutting tool lifespan testing and intermittent cutting damage lifespan test were carried out for ultrafine-grained WC-Co cemented carbide tool and general cemented carbide tool with different cobalt content under the condition of turning GH2132 super alloy at high speed. Based on the relationship between tool lifespan and cutting speed, the T-v empirical formulas were set up by the method of least squares. The wear and breakage figuration of the tool edges, the rake and flank faces were observed by ZEISS optical stereo microscope and microphotography system. The experimental results indicate that the main wear and breakage mechanisms of WC-Co cemented carbide tool is adhesive wear; the wear resistance of ultrafine-grained WC-Co cemented carbide tool is much higher than that of conventional cemented carbide; appropriately increasing Co content is beneficial to improve the wear and breakage resistance of ultrafine-grained WC-Co cemented carbide.