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Stained Glass Rock Share with you the factors that affect the quality of metal cutting

by:Spring Glass     2021-03-02
1. Factors that affect the quality of machined surface     1.1 The effect of machine performance on the quality of machined surface      (1) The influence of wear resistance on surface quality. Between the two contact surfaces of a newly processed friction pair, the rough peaks of the surface touch in the initial stage. The actual contact area is much smaller than the theoretical contact area. There is a very large unit stress in the contact part, making the actual contact Plastic deformation, elastic deformation and shear failure between peaks occur at the area, causing severe wear.     (2) The effect of fatigue strength on surface quality. Under the action of alternating loads, the valleys of the surface roughness are likely to cause stress concentration and fatigue lines. The larger the surface roughness value, the deeper the traces on the surface and the radius of the bottom, the worse the fatigue resistance. Residual stress has a great influence on the fatigue strength of parts. The residual tensile stress of the surface layer will expand the fatigue cracks and accelerate the fatigue damage; while the residual stress of the surface layer can prevent the expansion of fatigue cracks and delay the occurrence of fatigue damage.    (3) The effect of corrosion resistance on surface quality. The corrosion resistance of parts depends largely on the surface roughness. The larger the surface roughness value, the more corrosive substances accumulate in the valley. The corrosion resistance is worse. The residual tensile stress of the surface layer will cause stress corrosion cracking, reducing the wear resistance of the parts, and the residual compressive stress can prevent stress corrosion cracking. The surface layer is hardened by cold work. The plastic deformation caused by the cutting force during the machining process causes the character to be distorted and distorted, shear slip occurs between the grains, the grains are elongated, fibrous, and even broken, which will make the surface layer metal hardness and strength Increase, this phenomenon is called cold work hardening (or called strengthening). The main factors affecting cold work hardening are: the increase of the blunt radius of the cutting edge, the increase of the extrusion effect on the surface metal, the increase of plastic deformation, and the increase of the cold hard. The wear of the flank face of the tool increases, the friction between the flank face and the machined surface is intensified, and the plastic deformation increases, leading to increased chill. As the cutting speed increases, the action time between the tool and the workpiece is shortened, which reduces the depth of plastic deformation and the depth of the chilled layer. After the cutting speed is increased, the action time of the cutting heat on the surface layer of the workpiece is also shortened, which will increase the degree of cold hardness. As the feed rate increases, the cutting force also increases, the plastic deformation of the surface metal is intensified, and the chilling effect is strengthened. The greater the plasticity of the workpiece material, the more serious the chill phenomenon. Glass rock manufacturers, stained glass rocks, craft glass rocks, Qingdao stained glass rocks, natural glass rocks, stained glass rocks, Qingdao glass rocks, Qingdao craft glass rocks, Qingdao natural glass rocks, Qingdao stained glass rocks, Huizhou glass rocks, Zhongshan Glass Rock, Guangzhou Glass Rock Website:
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