CNC Turning processing technique applies extensively already at mechanical production industry, how efficient, reasonable, machine by what complete work by the quantity character, every project technology personnel that pursues this trade has his experience more or less. The author pursues numerical control education, groom reach treatment the job is old, accumulated certain experience and skill, the GSK980T series machine tool that manufactures with plant of facility of Guangzhou numerical control now is exemple, introduce a few CNC Turning to machine skill. One, program at present the schoolbook of our place bring into contact with reachs the skill of G00 of first magical function the technical book of CNC Turning respect, the program all is fastened first sentences to build workpiece coordinate, regard a program as first with β of Z of G50 X α namely. According to this instruction, but a coordinate is set, the coordinate value in making the some dot of cutting tool is fastened in this coordinate is (β of X α Z) (article workpiece coordinate is origin all set is in) of workpiece right end panel. Use this kind of method to write a program, to knife hind, must move the knife to just can undertake machining to the established position of G50 set, look for the course that follows this position to be as follows. To knife hind, assemble semifinished product of clip good work; Main shaft is turning, fiducial knife makes the same score handwheel A of workpiece right end panel; Z axis is not moved, edge X axis releases cutting tool to be nodded to C, input G50 Z0, computer remembers this a little bit; The program types means, input F50 of of G01 W-8, give workpiece turning one chance to extricateoneself from an awkward position; X axis is not moved, edge Z axis releases cutting tool to be nodded to C, jockey the γ of workpiece step diameter that measures turning to go out, input G50 X γ , computer remembers this a little bit; The program types means to fall, input β of Z of G00 X α , cutting tool moves to the program origin that process designing appoints, β of Z of α of reintroduce G50 X, computer remembers this program origin. In afore-mentioned measure, measure 6 namely cutting tool fixed position is in in β of X α Z crucial, otherwise, workpiece coordinate department can be revised, cannot process work normally. The person that has had treatment experience knows, afore-mentioned processes that manage cutting tool fixed position to β of X α Z are trival, once appear accident, x or Z axis do not have servo, dog make mistake, cut off the power wait for circumstance happening, the system can restart only, the system after restarting loses the memory that is worth to the workpiece coordinate of G50 set, "Restoration, time 0 move " act well no longer, need to run cutting tool to position of β of X α Z to pay equal attention to afresh set G50. If be batch production, after machining, answer G50 start to continue to machine below one, there is fault a bit in unit process of cargo bandling, revise workpiece coordinate department possibly. In view of afore-mentioned programs first use G50 establishs a variety of corrupt practice of workpiece coordinate department, it is fixed that the author thinks coordinate of method general workpiece go up in the machine tool, the program after β of Z of α of G00 X of instead of β of Z of α of first G50 X, problem be readily solved. Its unit process of cargo bandling needs to use afore-mentioned before 5 conditions that seek G50 course only, complete step namely 1, 2, 3, 4, 5 hind, run cutting tool to safe place, v program, by move automatically can. Although happen,cut off the power wait for accident circumstance, restart after the system, move cursor not to affect workpiece to machine the block of the process again to can safe treatment below editor means, continue to machine by automatic run mode can. The essence that afore-mentioned programs replace G50 first sentences with G00 is workpiece coordinate the department is secured go up in the machine tool, animal farm no longer the limitation at origin of program of β of Z of G50 X α , do not change workpiece coordinate to fasten, the operation is simple, dependability is strong, got the result that expect is less than. 2, the skill that controls dimension precision revises knife filling value to because be opposite for the first time,assure dimension precision other perhaps reason causes knife error workpiece error exceeds workpiece public errand, when cannot satisfying treatment to ask, can make through revising a knife to fill workpiece achieves requirement measure, make sure radial dimension method is as follows: Basis of absolutely coordinate input method " reduce greatly, small increase " principle, fill in the knife 004 place of 001 ～ are revised. Size of the workpiece when if use,2 cut off knife grooving became large 0. 1mm, and 002 place knife fills showing is X3.
8, importable X3.
7, reduce 2 knives to fill. Relative to exemple of coordinate law as above, 002 knives filling place inputs U-0.
1, yi Ke gets similar result. Manage together, also be like this analogize to the control of axial dimension. If use 1 extra round knife to machine somewhere shaft part, dimension grew 0.
1mm, w0 can be inputted in 001 knives filling place.
1. Semifinishing machining eliminates influence of filar lever clearance to assure dimension precision to lathe of major numerical control, use longer hind, as a result of the influence of filar lever clearance, machine the phenomenon that the work measure that give often appears to be not stabilized. At this moment, we can be after rough machining, undertake semifinishing machining removes the effect of filar lever clearance. After be like the circle outside using rough machining of G71 of a knife, u0 can be inputted in 001 knives filling place.
3, call G70 essence car, jockey after measuring, input U-0 in 001 knives filling place again.
3, call G70 essence car again. Through vehicle of this half fine, removed the effect of filar lever clearance, assured the stability of dimension precision. To program makes sure absolutely process designing assures dimension precision dimension precision process designing has absolutely process designing and opposite process designing. Opposite process designing is to point to go up in treatment outline curve, the terminal position of each line segment is coordinate origin with start of this line segment and affirmatory coordinate is. That is to say, the coordinate origin of opposite process designing often is in commutation, inevitable generation accumulates an error when successive displacement, absolutely process designing is to be in the whole process of treatment, all have relatively unified datum mark, namely coordinate origin, reason accumulates an error more opposite process designing is small. When CNC Turning workpiece, the precision of workpiece radial dimension compares axial dimension precision commonly tall, when reason is writing a program, radial dimension had better use absolutely process designing, considering treatment and the convenience that write a program, axial dimension often uses opposite process designing, but to important axial measure, had better use absolutely process designing. Numeric conversion makes sure a lot of circumstances issue dimension precision, the dimension datum on the design and the dimension datum that process designing needs are abhorrent, the standard measure conversion that should get on the design first is reason the dimension in department of process designing coordinate. If graph 2b is medium, remove measure 13.
Outside 06mm, the others all belongs to the process designing dimension that tags dimension to get via conversion hind by graph 2a directly. Among them, φ 29.
16mm of 95mm, φ and 60.
3 dimension are 07mm to take the process designing measure that gets after average of two maximums size respectively. In CNC Machining of dimension of filling control of modification program and knife, we often come up against a kind of such phenomena: After the process moves automatically, jockey measure, discover work measure short of asks, size variation does not have the rule. If use 1 extra circle,knife treatment plan shows work 3 times, measure via jockeying after rough machining and semifinishing machining, measure of radial of each shaft part is as follows: φ 30.
06mm, φ 23.
03mm and φ 16.
02mm. To this, the author uses the method that modification program and knife fill to undertake remedying, the method is as follows: The X30 in modification program original program is changeless, x23 instead X23.
03, x16 instead X16.
04, come so, each shaft part all has the unified noncombatant duty that exceeds nominal measure 0.
06mm; Change a knife to fill in knife of a knife 001 place input U-0.
06. Fill through afore-mentioned programs and knife after the modification of work along both lines, call fine car program again, work measure can get effective assurance commonly. CNC Turning treatment is the automation treatment means that is based on numerical control program, in be being machined actually, handlers has stronger program statement to use ability and rich practice mastery of a skill or technique only, just can weave the machine program that gives high quality, treatment gives the work of high quality. CNC Milling
CNC Machining