Machined surface quality problem
Machining is a process of using machinery or performance of the dimensions of the workpiece changes. Press the workpiece is machined in a temperature state, it is divided into cold and hot working. Generally at room temperature processing, and does not cause the workpiece chemical or phase changes, called cold. Generally above or below normal temperature processing, can cause chemical or phase change material of the workpiece, said thermal processing. Cold press difference processing methods can be divided into cutting and pressure processing. Thermal processing are common heat treatment, forging, casting and welding.
Machined surface quality, refers to the microscopic parts in machining after machining surface roughness, also called roughness to Ra \ Rz \ Ry three kinds of code plus numerals, mechanical drawings, there will be a corresponding surface quality requirements, typically the surface roughness Ra <0.8um surface when said: mirror. Its surface quality after machining directly affect the physical, chemical and mechanical properties of the workpiece. Performance, reliability, quality of life depends on the surface of the main parts to a large extent. Surface quality in general, important or critical parts requirement is higher than ordinary parts. This is because the machining table and good quality parts will improve the wear resistance, corrosion resistance and fatigue breakage capacity largely
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