Abstract
The cutting of high hardness composite materials such as sintered carbides based on the cobalt is a challenge from a technological point of view. The paper presents the influence of cutting data (v c, f, a p) and cobalt content in a work piece (10, 15, and 25 wt%) on the turning process of WC-Co with polycrystalline diamond (PCD) tool. This study focuses on the main component of cutting force F c and surface roughness, described by the roughness parameter Ra. The research plan, based on the Taguchi method, and variance analysis ANOVA were applied. Two types of experimental model, which describes turning process of sintered carbides based on the power function for three variables and polynomial functions as a modified method of the response surface methodology (RSM), were also presented.
Highlights
The introduction of new standards in the field of environmental protection imposes the implementation of the new technology of super-hard material machining [1]
The influence of the Co content and WC grain sizes on cutting process by the effect of wear by tools confirms the results presented in [18, 19], while both dry turning and using coolant cutting forces increase have a linear character
The ANOVA analysis was used to indicate the percentage influence of the particular cutting data on the main cutting force Fc values and the surface roughness described by the parameter Ra after the sintered carbides turning
Summary
The introduction of new standards in the field of environmental protection imposes the implementation of the new technology of super-hard material (such as sintered carbides WC-Co) machining [1]. Belmonte et al [16] determined the cutting data (vc, f, ap) influence on the machining force value, wear tools, and working surface roughness while dry turning of WC-Co with 25 wt% Co content using CVD diamond brazed tools. The effect of the adhesion process between the tool and cutting material in the sintered carbide turning process in the environment of the coolinglubricant substance has not been described This impact was presented in the works [20, 21]. An algorithm of experimental models building and optimization of WC-Co turning process was presented, which includes the research of cutting data (vc, f, ap) as well as Co content in the material structure influence on the main cutting force component Fc and machined surface quality, described by Ra parameter.
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