Abstract
Short carbon-fiber-reinforced composites, especially short carbon-fiber-reinforced polyetheretherketone composites (CF-PEEK), are used extensively in the engineering field because of their superior properties. However, their surface quality and material removal rate need to be optimized to satisfy design and processing requirements. This work focused on a multi-objective optimization to minimize the surface roughness and maximize the material removal rate during machining by grey relational analysis with an analysis-of-variance (ANOVA) and response surface methodology before a multi-objective mathematical model was established. The statistical significance of the predicted model was examined by using an ANOVA to obtain the optimal machining parameters (spindle speed, feed rate, cut depth). The optimal combination of cutting parameters was a spindle speed of 2600 rpm, a feed rate of 720 mm/min, and a cut depth of 1.8 mm.
Highlights
Polyetheretherketone (PEEK) is a crystalline highperformance special engineering plastic with excellent physical, mechanical, chemical, electrical and thermal properties such as its high heat resistance, fire resistance, and fatigue resistance.[1]
It has been concluded that optimum machining parameters can be obtained by the predictive model and the predictive model was statistically significant by analysis of variance (ANOVA)
It was observed that feed rate is the main cutting parameter for the maximization of cutting efficiency and the minimization of surface roughness followed by the cut depth and spindle speed
Summary
Polyetheretherketone (PEEK) is a crystalline highperformance special engineering plastic with excellent physical, mechanical, chemical, electrical and thermal properties such as its high heat resistance, fire resistance, and fatigue resistance.[1] To enhance the PEEK strength and performance, it is often necessary to add carbon fiber to the PEEK matrix.[2] Because carbon fiber and PEEK have a good compatibility, they can enhance the strength, friction performance and thermal properties of composites. Carbon-fiber filling provides the composites with a high performance, but increases the machining difficulty.[3] Cutting of CF-PEEK composites is usually needed to obtain components with a specified shape to meet the required dimensional accuracy and surface roughness to complete the assembly process.[4] because of the discontinuity, non-uniformity and anisotropy of the phase distribution of CF-PEEK composites, the cutting process is complex with fiber fracture, matrix cracking and fiber and matrix separation and release. Surface roughness is an important index that is School of Mechanical Electronic & Information Engineering, China University of Mining & Technology, Beijing, Beijing, China
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