What are the factors that affect the cutting surface roughness in precision parts processing? ?

u200b What are the factors that affect the cutting surface roughness in precision parts processing? ? 1. The influence of cutting force and friction. When precision parts are processed and cut, the cutting edge fillet of the tool and the extrusion and friction of the side facing the workpiece will cause plastic deformation of the metal material, which will cause the existing residual area to distort or deepen the groove, increase the surface roughness and cause When processing brittle materials, the cutting chips become broken particles, and the processed surface often shows traces of particle collapse, leaving many pits and making the surface rough. 2. The influence of built-up tumor. When the cutting tool cuts the plastic at a certain speed, some small particles on the chip will adhere to the tip of the rake face, forming a high-hardness piled edge, which can replace the rake face and cutting edge cutting.u200b When the friction between the chip and the accumulation edge is greater than the cold welding strength between the accumulation edge and the rake face, or when it is subjected to impact or vibration, the accumulation edge will fall, so that the new-up edge will gradually be built in the future generate. The formation, growth and shedding of the accumulation edge will seriously affect the surface roughness of the part. 3. The influence of scales. In the cutting process, due to the friction and cold welding of the chips on the cutting surface during the machining of precision parts, the chips will regularly stay on the rake surface, thereby squeezing the newly processed surface. In severe cases, the surface will tear. Scaly spines are formed on the surface, making the surface rough and uneven. Due to the influence of the above physical factors on the roughness, in order to reduce the surface roughness, in addition to reducing the plastic deformation caused by the cutting force, avoid the accumulation of tumors and scales during the machining of precision parts. The main technological measures are: choosing the cutting speed that is not easy to produce accumulation edges and thorns, improving the cutting performance of the material, choosing the correct cutting fluid, etc.