Abstract
Adhesion of cutting tool and chip often occurs when machining stainless steels with cemented carbide tools. Wear mechanism of cemented carbide tool in high speed milling of stainless steel 0Cr13Ni4Mo was studied in this work. Machining tests on high speed milling of 0Cr13Ni4Mo with a cemented carbide tool are conducted. The cutting force and cutting temperature are measured. The wear pattern is recorded and analyzed by high-speed camera, scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS). It is found that adhesive wear was the dominant wear pattern causing tool failure. The process and microcosmic mechanism of the tool’s adhesive wear are analyzed and discussed based on the experimental results. It is shown that adhesive wear of the tool occurs due to the wear of coating, the affinity of elements Fe and Co, and the grinding of workpiece materials to the tool material. The process of adhesive wear includes both microcosmic elements diffusion and macroscopic cyclic process of adhesion, tearing and fracture.
Highlights
Cemented carbide tools are regarded as the most suitable tool material available commercially for machining of stainless steels [1]
Due to high plasticity of stainless steels at high cutting temperature, high cutting force and high temperature is generated in machining stainless steels, which produces a situation for adhesion of the workpiece material to the tool and will shorten the tool life [10, 11]
Elements affinity is easy to occur between the tool and workpiece materials, which leads to the adhesion
Summary
Cemented carbide tools are regarded as the most suitable tool material available commercially for machining of stainless steels [1]. When machining stainless steels with cemented carbide tools, the physical and mechanical properties of stainless steels have great influences on the machining process, in which the heat-conducting property and cutting temperature are the crucial factors [7, 8]. Machining of stainless steels is a very complex process with physical interactions involving cutting temperature, cutting force, plastic deformation, friction, high strain rate, and tool wear or failure [9]. Due to high plasticity of stainless steels at high cutting temperature, high cutting force and high temperature is generated in machining stainless steels, which produces a situation for adhesion of the workpiece material to the tool and will shorten the tool life [10, 11]. The wear mechanism and process are discussed based on the experimental results
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