If why finish the part that only grinder ability obtains to machine precision in lathe,ask

Treatment difficulty analysis has one to approve the manufacturing task that comes from some smooth machine place, no matter this task is processing data, still go up in treatment precision, it is a kind of brand-new challenge, among them convex runner shaft coming back (the treatment existence of 1) seeing a picture is the following difficult problem: (What 1) convex runner shaft coming back uses is titanium alloy material, as a result of its intensity big, hardness is tall, add man-hour to produce case hardening layer extremely easily, and small, stretch model measures material coefficient of thermal conductivity small, the spring back amount that the surface processes when cutting is very large, the acuteness attrition of face of the knife after causing cutting tool, conglutinate and felt wear away. (2) is in make sure the appearance machines precision while, two upright coaxial spend the part requirement 0.

006mm, for this organic to showing bed, achieve hard almost. After be being started because of existing machine tool, oneself main shaft is jumpy already > 0.

01mm, on such machine tool difficulty of task of the treatment that finish cans be imagined. (The dimension precision demand of appearance of 3) spare parts and aperture is very high, it is respectively 0.

005mm and 0.

01mm, requirement surface surface roughness is worth Ra=0.

8 μ M. The need below normal circumstance machines ability to realize this design to ask on grinder. Because undertake without grinder equipment nicety is machined inside cent factory, then this mission must be finished by lathe. Careful research had to the design above all before treatment, analysed a variety of treatment program, final decision adopts following methods to undertake machining. Graph 1 　 　 2.

The material of alloy of choice basis titanium of craft parameter is characteristic, function of actor choosing intensity better, brand is function of caustic of tall, wear-resisting the cutting tool material of YW series undertakes machining. (Parameter of 1) cutting tool: The circle outside choosing tool cutting edge angle to be the positive and negative of 90 ° slants knife and horizontal chamfer lathe tool each one. In assure intensity of cutting tool cutting while, to reduce cutting resistance, prevent material to be out of shape in the overheat in cutting process, the 20 ° with bigger selection of the horn before cutting tool -- 25 ° . It is to avoid face of the knife after cutting tool in cutting process the quick attrition with spare parts surface, felt, the horn after cutting tool chooses to be 5 ° -- 8 ° . (2) cutting parameter: Because coefficient of thermal conductivity of titanium alloy material is low, stretch modular amount is small, in machining a process easy generation felt, value of parameter of the cutting in be being machined so has been installed not easily big, main shaft rotate speed chooses to be in 350 -- 500r/min, unfavorable and exorbitant. Back penetration of a cutting tool is measured and choose when feed thick car a few bigger, the choice when fine vehicle is a few less. 3.

Treatment technique 　 (1) thick car: Use knife of horizontal tank car above all the part two upright appearances have thick car (2) seeing a picture, unilateral leaves surplus 0.

5mm. Because the obstruction in process of cutting of knife of horizontal tank car breaks bits smally, easily, so groovy knife is opposite use horizontal stroke the graph outside two end effect of 1 form thick car is better. But because titanium alloy material is in treatment,extremely easy heat is out of shape, must use cutting fluid to undertake cooling adequately in cutting process so. Graph 2 　 　 (half essence of 2) car: After waiting for a spare parts to cool thoroughly, reuse the circle outside 90 ° slants of knife general spare parts fiducial outside round car goes, hold spare parts external form through soft ungual clip, use micron lever to express appearance of corrective spare parts (3) seeing a picture, make a circle jumpy achieve 0.

005mm less than, undertake machining directly to the spare parts, cannot machine reach the designated position, unilateral leaves surplus 0.

1 -- 0.

2mm. Graph 3 　 　 (3) fine vehicle: After surplus of appearance of ① spare parts is excised, bore, bore hole, make sure dimension and precision ask. Again appearance of corrective spare parts, make sure dimension precision is in 0.

005mm less than, fine vehicle appearance leaves surplus 0.

05mm. Locate with the Kong Wei inside two end as a result of double top fiducial, and the part is final the appearance surplus before fine vehicle is lesser (0.

05mm) , so bore is mixed bore hole to install clip to search in with fine vehicle appearance in the middle of finish, do good orifice to pour wine cup, to issue ready-made of working procedure of a double top. ② is on the machine tool car one tip, adopt the part the method of double top, use positive and negative slants the knife has car of essence of life to bicephalous appearance (4) seeing a picture, appearance of polishing spare parts, achieve exterior surface roughness to be worth Ra=0.

The requirement of 8 μ M. Graph 4 　 　 4.

Epilogue uses this to process technique, final and successful the treatment that completed a part. Through detecting, spare parts each dimension precision and form tolerancepublic errand all achieved blueprint appearance to ask. CNC Milling CNC Machining