# Integral impeller is efficient technology of CNC Machining process designing

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5 (Ke B2 + Kc F 2) , among them Ke=1/Re, kc=1/R, the curvature that is generatrix of bosomy form knife respectively and the biggest rotate the smallest radial curvature of radius correspondence. Be nodded to be in in P by treatment curved surface local 2 rank it is Ns = 0 approximately.

5 (K1 B2 + K2 F 2) , the 1 K in type, 2 K parts to be in P point point for blade curved surface advocate curvature. The standard that sets H to be apart from blade curved surface to rouse face of form cutting tool to height, namely H = NT - NS=0.

5[(Ke-k1) B2+ (Kc-k2) F 2] . If rouse curved surface of form knife and lamina not to produce interference, need to satisfy pair of random (B, f) have H ≥ 0, ask namely Ke>k1, and Kc>k2. Interference differentiate algorithm is as follows: Become the disperse of blade curved surface of integral impeller above all enough much disperse nods {Pi} , i=1, 2, ... , n, undertook an analysis to random again, those who divide curved surface of separate out lamina is the biggest with {k1i} of the smallest curvature and {k2i} , set K1=max{k1i} and K2=max{k2i} , want K1 of Kc ≥ only and Kc>K2, the scarcely when the bosomy form knife that is geometrical parameter with this machines blade curved surface can generate local interference. The law of unripe set prescription of contrail of cutting tool of program of program of contact of knife of treatment of knife of 2 beat form is based on wait for parameter line to change the pace grows a way, set current knife contact to be P (Ti) , pass P of contact of below computation of bowstring cut law one knife by this bits (Ti+1) , make machining error δ is not more than treatment tolerance Ei between 2 o'clock. Set knife direction to add way for parameter, namely Ti+1>ti, make sure Ti+1 is in a relatively lesser initiative interval limits. Algorithmic description is as follows (refer to a graph 7) . (1) a few disperse that become parameter line disperse divide into equal parts nod P (Tj) , j=1, 2, ... , n, set current knife contact to be P (Ti) . (2) the position that the holiday places one knife contact is P (Ti+1) , computation the distance D between 2 o'clock, decide the midpoint T of line segment. (3) set T= (Ti+ti+1) / 2, get P is nodded on parameter line (T) , p is nodded on T of midpoint of computational line segment and parameter line (T) the distance between, machine the error δ that exists when curved surface namely. (4) if δ Ei, decide P of next knife contact (Ti+1) nod P for the record (U) . Knife of 3 beat form machines a knife after dot computation waits for knife contact and cutter shaft vector to decide, knife the geometrical concern that dot C can show 6 times according to the graph is begged conveniently piece. When vector of computational cutter shaft, as a result of photograph adjacent 2 knives contact is close to very much commonly, its interference environment is similar, cutter shaft vector is basic and identical perhaps change not quite, not was necessary to be calculated in position of every knife contact vector of its cutter shaft, will reduce treatment efficiency so. The place that studies in change of curved surface curvature acuteness place produces collision easily perhaps to interfere installed vector of a few crucial cutter shaft. Pass follow-up interference to check, vector of correction cutter shaft, again according to the knife coordinate calculation method can reach new knife digit is occupied. Calculate exemple basis afore-mentioned algorithm, process designing of the rough machining that insert mill and the module of finish machining process designing that are based on bosomy form cutting tool were developed on UG NX. The graph is shown 8 times for impeller of whole of engine of some model aviation contrail of cutting tool of the rough machining that insert mill reachs treatment to emulate a graph, the graph is shown 9 times wait for parameter for finish machining. Last word from raise treatment efficiency to set out, discussed face the rough machining that inserts mill and the technology of finish machining process designing that are based on bosomy form cutting tool, designed corresponding cutting tool contrail to generate algorithm, rough machining and module of software of finish machining process designing were developed 2 times on UG NX, gave out to calculate exemple, test and verify the rationality of article method. CNC Milling CNC Machining