The issue that be in is put in be being machined in the light of thin wall spare parts, from the outfit clip of the spare parts, cutting tool is chosen, the choice of cutting dosage, had many test, to will machine thin wall spare parts better henceforth, assure quality, provided academic basis. Key word: Turning, bao Bi one, spare parts of introductive Bao Bi already applied in each industry department widely increasingly, because it has weight light, managing material, the structure is compact wait for a characteristic. But the treatment of thin wall spare parts is a thornier problem in turning, the reason is difference of tigidity of thin wall spare parts, intensity is weak, be out of shape extremely easily in treatment, make the form of the spare parts the error increases, assure the treatment quality of the spare parts not easily. For this pair of Bao Bi the outfit of the spare parts is placed, of cutting tool reasonable choose, the choice of cutting dosage, had many test, to will machine thin wall spare parts better henceforth, assure quality, provided academic basis. 2, the change graph of the means that hold clip is shown 1 times to cover kind of Bao Bi part. Difference of its round diameter of inside and outside is very little, intensity is weak of course, if be in on chuck when clamp,pass forcibly big, can make generation of thin wall spare parts is out of shape, cause the circularity error of the spare parts. If be placed incompactly on chuck, make the spare parts becomes loose likely when turning and discard as useless. The size of clamping force, the clamp when we take thick car some, the clip when fine vehicle is some more loose come to those who control a part to be out of shape. Graph 1 kind of thin wall spare parts from the graph 2 in can see the spare parts is from centering chuck in 3 claw jacket is placed, the spare parts gets only 3 ungual clamping force, clamping force disequilibrium, make the spare parts is out of shape thereby. If maintain clamping force of each bits on the spare parts balanced, in other words, the outfit that increases a spare parts namely places interface, and the clamping force that reduces each a little bit. If the graph is shown 3 times, use seam claw of soft card of sleeve or sector, pass an experiment to prove: Hind clamp of a kind of method, of the spare parts be out of shape small, the method is feasible. If we change the action spot of clamping force, if the graph is shown 4 times, by clamp of axial of radial clamp instead, pass experiment analysis: Of axial clamping force the 1/6 that stress is radial clamping force about, of the spare parts be out of shape very small, also can explain axial impaction method is helpful for bearing the weight of clamping force, and do not cause a spare parts to be out of shape. Graph sketch map of 4 axial clamp 3, choose reasonable cutting dosage is out of shape when turning of Bao Bi spare parts is many sided. Assemble the clamping force when placing workpiece, the cutting force when cutting workpiece, the flexibility of the generation when cutting of cutting tool of workpiece block up is out of shape and plasticity is out of shape, make generation cutting area temperature is elevatory and hot be out of shape. Closely related the size of cutting force and cutting dosage. From " metallic cutting principle " in can you know: ? Noisy the predestined relationship reads Jun P, feed F, cutting speed V is 3 element of cutting dosage. Does: discover in the experiment? ?) carries quantity of penetration of a cutting tool and feed on the back to increase at the same time, cutting force also increases, be out of shape big also, spare parts of thin to turning wall is very adverse. 2) reduces amount of back penetration of a cutting tool, increase feed, although cutting force drops somewhat, but area of workpiece surface remains increases, exterior surface roughness is worth big, the internal stress of the thin wall spare parts that makes intensity bad increases, also meet those who cause a part be out of shape likewise. So, when rough machining, when quantity of back penetration of a cutting tool and feed can take precision work of somes of big; , quantity of back penetration of a cutting tool is in commonly 0. 2-0.
5 Mm, feed is in commonly 0.
1-0.
2 Mm/r, smaller even, cutting speed 6-120 M/min, the spent volume is high cutting rate when fine vehicle, but not easy and exorbitant. Reasonable choose 3 element to be able to reduce cutting force, decrease thereby be out of shape. 4, the geometrical angle of logical choice cutting tool is in the turning of Bao Bi spare parts, angle of reasonable cutting tool geometry is right the size of force of the cutting when turning, the heat of the generation in turning is out of shape, the microcosmic quality of workpiece surface is crucial. Size of the role before cutting tool, deciding cutting to be out of shape the sharp degree with the horn before cutting tool. Before part is large, cutting is out of shape with attrition force is reduced, cutting force is reduced, but before part is too large, can make the wedge horn of cutting tool is reduced, cutting tool intensity is abate, cutting tool comes loose hot condition is poor, wear away accelerate. So, general turning steel when the thin wall spare parts of material, with high-speed steel cutting tool, horn takes 6 ° before - 30 ° , with hard alloy cutting tool, horn takes 5-20 ° before. Of cutting tool hind part is large, attrition force is small, cutting force also is reduced accordingly, but hind horn also can make cutting tool intensity abate greatly too. When spare parts of turning thin wall, with high-speed steel lathe tool, the horn after cutting tool takes 6-12 ° , with hard alloy cutting tool, horn takes 4-12 ° after, take when fine vehicle bigger hind horn, take when thick car lesser hind horn. Tool cutting edge angle is in 30 ° - inside 90 ° limits, when the inside and outside of spare parts of car Bao Bi is round, take big tool cutting edge angle. Deputy slant horn takes 8 ° - 15 ° , take when fine vehicle bigger deputy slant horn, take when thick car lesser deputy slant horn. 5, when cutting fluid uses rough machining of high-speed steel cutting tool to the influence of thin wall spare parts, with aqueous solution refrigeration, when basically dropping precision work of cutting temperature; , when finish machining of medium, low speed, it is good to choose lubricant property extremely press cutting oil or Gao Nong to spend extremely press emulsion, the quality that main improvement already machined the surface and raise cutting tool of hard alloy of cutting tool service life, when rough machining, need not use cutting liquid, also can employ emulsion of low pH indicator or aqueous solution when necessary, but must continuously, sufficient ground is pouring when the cutting liquid that uses when; finish machining and rough machining basic and identical, but should raise its appropriately lubricant function used cutting fluid adequately in turning process to reduce cutting force not only, the durability of cutting tool gets rising, the value also reduced workpiece surface surface roughness. At the same time workpiece does not suffer the effect of heat in metal cutting and make its treatment dimension and geometrical precision produce change, assured the treatment quality of the spare parts. CNC Milling