Casing kind the spare parts is to show having an above opening is commonly, interior has one to finalize the design antrum or cavity, there is certain proportional part in long, wide, tall direction. This kind of spare parts is made in mechanical industry, car, plane wait for each industries to be used morer, be like the engine cylinder body of the car, gear-box body; Box of the headstock of the machine tool, main shaft; Body of pump case of diesel engine cylinder body, gear. The graph is shown 1 times to control housing of a powerful person, graph 6-6 place shows casing of main shaft of heating power engine. Graph housing of 1 control a powerful person pursues casing of casing of main shaft of engine of 2 heating power kind the spare parts needs to undertake multitask commonly aperture department, outline and planar treatment, tolerancepublic errand is severe beg taller, especially form tolerancepublic errand requirement is relatively strict, should pass mill normally, auger, enlarge, boring, bore with a reamer, Huo, the working procedure such as tap, need cutting tool is more, difficulty is machined on general accuracy machine tool big, tool a cycle of songs in a traditional opera is much, cost is high, treatment cycle is long, need for many times to hold clip, search, measure a number by hand much, cutting tool must change often when treatment, craft is made hard, more important is precision assures hard. This kind of spare parts is machined on machining center, outfit places achievable general accuracy machine tool 60 ％ the working procedure content of one 95 ％ , spare parts each precision consistency is good, quality is stable, save cost with season, shorten production is periodic. Machine casing kind the machining center of the spare parts, when working station more, need workbench for many times to rotate the part that angle ability completes, choose horizontal boring mill commonly kind machining center. The work that should process less, and when span is not big, optional vertical machining center, undertake machining from one aspect of the matter. Casing kind the treatment method of the spare parts, basically have the following kinds: (1) should have a face to have Kong Shi again already, ying Xianxi face, aperture is machined after; (All 2) aperture fasten the rough machining that finishs entire hole first, have precision work again; (3) usually, diameter > the Kong Dou of Φ30 ㎜ should cast a semifinished product aperture. Finish the rough machining of semifinished product first on general accuracy machine tool, the allowance that machines working procedure to machining center is 4 ～ 6 ㎜ (diameter) , go up again the thick, precision work that machining center has face and opening. Divide “ thick boring normally - half essence boring - Kong Duan pours wine cup - ” of boring of essence of life is versed in the pace is finished 4 times. (The aperture of ㎜ of 4) diameter <Φ30 need not casting gives semifinished product opening, the end panel with aperture machines aperture to be finished in machining center entirely. Can divide make the same score end panel — for “ Huo (hit heart hole) — gets Kong Duan of — enlarge — to pour ” of horny — bore with a reamer to wait for labor situation. The alveolus that coaxial spends a requirement (<Φ30 ㎜) , must use “ Huo to make the same score end panel — (hit heart hole) — gets — Kong Duan of — of half essence boring pours boring of horny — essence (or bore with a reamer) ” labor situation will finish, hit a heart to aperture needs to inspect particular case and be decided among them. (5) is in aperture department treatment, machine large hole first, rework alveolus, it is especially below the circumstance with size aperture very close apart, should take this one step more; (The coaxial Kong Jia of the casing with bigger to span 6) is versed in, adopt the method that tune machines as far as possible, in order to shorten knife complementary provided long way is compared, increase cutting tool tigidity, improve treatment quality; (7) thread machining, usually, m6 ㎜ above, the whorl aperture under M20 ㎜ can finish whorl tap on machining center. M6 ㎜ is the following, the whorl of M20 ㎜ above can finish bottom outlet to machine on machining center, tap can pass other method treatment. When because the automatic treatment means of machining center is in,attacking small whorl, cannot control treatment state randomly, small tap breaks off easily, produce waste product thereby, as a result of cutting tool, complementary wait for element influence, big whorl of M20 ㎜ above is attacked to have certain difficulty on machining center. But this also is not absolutely, can inspect particular case and decide, razor blade of usable on certain machine tool boring finishs whorl cutting (with G33 code) . CNC Milling