# The knife in metallic cutting treatment, bits is close together model the research that contacts length

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- source:WEDEMEYER CNC Machining

1mm; Aw=2.

5mm; Test specimen material is 10 steel; Orthogonal and free cutting. Pass cutting experiment and computation, get 3 show cutting rate pursueing respectively. With the knife, bits is close together model the two relations curve that contacts length Ln (computational result and) of actual measurement result. Compare two curves knowable, when cutting speed V>68m/min, computational result and be identical of actual measurement result are gotten very good, both tends consistent; is become when V<68m/min, actual measurement result is more than computational result; When V=35m/min both differs the biggest (amount to 24%) . The main reason that creates this kind of difference is Lee Xiefu material of workpiece of hypothesis of model of skid wire field is body of ideal firm plasticity, oversight in cutting process by the treatment sclerosis of cutting material. And in actual cutting process, on one hand the treatment that meet an emergency can cause workpiece material is sclerotic, the heat in metal cutting with the many on the other hand generation when cutting makes again workpiece material bate, the action of both is weakened each other. When V>68m/min, the heat in metal cutting of the generation when cutting makes workpiece material bate, effect can ignor the treatment sclerosis of the material that be cut to be cut right now material can regard ideal firm plasticity as body, computational result and be identical of actual measurement result are accordingly better. By the graph 4 show cutting rate. The relation curve with B of angle of friction is knowable, when V>68m/min, b of angle of friction tends fair value. When V<68m/min, machine sclerotic effect to take dominant place, right now material cannot regard ideal firm plasticity as body, the knife because of this actual measurement, bits is close together model osculatory length cost is more than computational value. To the graph 4 make further analysis knowable, when V=35m/min, b of angle of friction is the biggest, show treatment sclerosis effect is most right now distinct, because of this knife, bits is close together model osculatory length Ln has maximum, its computation value and actual measurement value differ the biggest also. Pursue V of 3 cutting speed and knife, bits is close together model the relation graph that contacts length Ln the relation graph of V of 4 cutting speed and B of angle of friction Ae of 5 cutting ply and knife, bits is close together model the relation graph that contacts length Ln G0 of the horn before 6 cutting tool and knife, bits is close together: High-speed steel cutting tool, g0=5 ° , a0=8 ° ; V=8.

64m/min, aw=2.

5mm; Test specimen material is cutting of orthogonal freedom of 10 steel; . Pass cutting experiment and computation, get 5 show cutting ply Ae and knife pursueing respectively, bits is close together model the two relations curve that contacts length Ln (computational result and) of solid side result. Compare two curves knowable, when cutting ply Ae<0.

When 2mm, two curves are basic be identical; Increase as cutting ply, the difference of both also increases ceaselessly, and actual measurement result is more than computational result. Its reason basically is: ① is being calculated knife bits is close together model when contacting length, assume the material that be cut is body of ideal firm plasticity, and the place before be like is narrated, machine sclerotic effect to take dominant place right now, material cannot regard ideal firm plasticity as body; What ② cuts bits is transverse be out of shape increase along with the accretion of cutting ply, when Ae>0.

When 2mm, cut bits transverse be out of shape cannot oversight, because this does not accord with Lee Xiefu cutting skid wire the hypothesis condition of condition of meet an emergency of field model plane. The horn before cutting tool is right knife, bits is close together model the condition of influence cutting experiment that contacts length: High-speed steel cutting tool, a0=8 ° ; Ae=0.

1mm, aw=2.

5mm, v=110.

58m/min; Test data is cutting of orthogonal freedom of 10 steel; . Pass cutting experiment and computation, g0 of the horn before getting 6 show cutting tool pursueing respectively and knife, bits is close together model the two relations curve that contacts length Ln (computational result and) of actual measurement result. By the graph 6 knowable, the metabolic trend of two curves is consistent. Experiment according to afore-mentioned cutting integration analysis result is knowable, below certain cutting condition, with Lee Xiefu field model is cutting skid wire the formula that fundamental derivation gives (the computational value of 1) and actual measurement are worth basic be identical, as a kind of similar processing technique, use formula (1) computation knife, bits is close together model osculatory length has real sense. The article uses 4 verdict Lee Xiefu field model derivation gives cutting skid wire knife, bits is close together model osculatory length gauge calculates formula to be. This type makes clear a knife one bits is close together model osculatory length is cutting process in the first, the 3rd result that is out of shape collaboration of area put together is used. Below certain cutting condition, when by the treatment sclerosis effect of cutting material but by oversight when, type (the knife of 1) plan cipher out, bits is close together model value of osculatory length Ln and be identical of photograph of actual measurement value. Cutting tries check proof, lee Xiefu field model just is in cutting skid wire the approximate method below certain cutting condition, but still have academic guidance and actual application sense. CNC Milling