Assure work measure and exterior quality with standard of 2 fine vehicle

Main train of thought uses a setting rub bad news and change size number namely 2 the main train of thought of the method of fine vehicle is: Numerical control lathe is right after the knife, before outline of wheel of thick, essence, come to the v of wear and tear in numerical control device, set corresponding X value or Z value into finish machining surplus to establish value of wear and tear beforehand namely, install craft sex to suspend dictating in CNC Machining program, lathe of starting numerical control is ordinal the thick, precision work that has outline to workpiece, measure workpiece the dimension of departmental cent, after surplus of subtractive fine vehicle with part drawing medium dimension median undertakes comparative, greaten with the value, or the decrescent that be the same as a value, modification wear and tear will solve; Size variation is different when the value, the size number of this part in modification machine program, meanwhile, also can check the exterior surface roughness of workpiece, look to whether achieve a requirement, if short of asks, modification cutting dosage is like feed or main shaft rotate speed (or cutting speed) , finally again fine vehicle, namely 2 fine vehicle, make the dimension of workpiece and exterior surface roughness achieve design requirement thereby. Among them, the value of the wear and tear when 2 fine vehicle (- δ ) or dimension changes a volume (- δ ) usable and the following formula gets: The actual measurement after vehicle of δ ＝ first time fine is worth - median of the dimension in the design - in setting wear and tear to be worth type beforehand, δ -- the variation of work measure (Mm) 　 　 2.

　 of applied give typical examples (1) exemple 1 car cartography shows axial part 1 times, fine vehicle surplus is 0.

3mm, memory of cutting tool wear and tear is entered before the outline outside vehicle of thick, fine in, in be worth the X of the wear and tear of fine vehicle cutting tool, add 0.

3 Mm, have car of thick, essence to workpiece after that. If measure Φ of two important measure 42 ㎜ and ㎜ of Φ 30, it is Φ respectively 42.

34mm and Φ 30.

34mm, criterion: δ 1=42.

34-41.

985-0.

3=0.

055 (Mm) 2=30 of 　 　 δ .

34-30.

985-0.

3=0.

055 (Mm) 2 　 of δ of 1= of 　 　 δ at this moment, we want to be worth the X of wear and tear of this cutting tool instead only - 0.

055, hind again the outline outside fine vehicle can obtain requirement measure Φ 41.

985mm and Φ 30.

985mm. If measure ㎜ of 42 of Φ of two important measure and ㎜ of Φ 30, it is Φ respectively 42.

19 Mm and Φ 30.

19mm, criterion: δ 1=42.

19-41.

985-0.

3=-0.

095 (Mm) 2=30 of 　 　 δ .

19-30.

985-0.

3=-0.

095 (Mm) 2 　 of δ of 1= of 　 　 δ at this moment, we want to be worth instead in the X of wear and tear of this cutting tool only 0.

095, hind again the outline outside fine vehicle can obtain requirement measure Φ 41.

985mm and Φ 30.

985mm. (2) exemple 2 cars cartography shows axial part 2 times, fine vehicle surplus is 0.

3mm, ㎜ of 35 of the Φ after thick car and ㎜ of Φ 30, memory of cutting tool wear and tear is entered before the outline outside vehicle of thick, fine in, in be worth the X of the wear and tear of fine vehicle cutting tool, add 0.

3 ㎜, have car of thick, essence to workpiece after that. If measure ㎜ of 35 of Φ of two important measure and ㎜ of Φ 30, it is Φ respectively 35.

365mm and Φ 30.

405mm, criterion: δ 1=35.

365-35.

020-0.

3=0.

035mm (㎜) 2=30 of 　 　 δ .

405-30.

020-0.

3=0.

085mm (㎜) 1 ≠ of 　 　 δ 2 　 of δ at this moment, we should be only in block of finish machining of this cutting tool corresponding X35.

020 with X30.

X35 of 020 coordinate instead.

985 with X29.

935, the outline outside having car of essence of life again next can obtain requirement measure Φ 35.

020mm and Φ 30.

020mm. If measure ㎜ of 35 of Φ of two important measure and Φ 30 ㎜, it is Φ respectively 35.

29 5mm and Φ 30.

256mm, criterion: δ 1=35.

29 5-35.

020-0.

3=-0.

2=30 of δ of 025mm 　 　 .

256-30.

020-0.

3=-0.

1 ≠ of δ of 084mm 　 　 2 　 of δ at this moment, we should be only in block of finish machining of this cutting tool corresponding X35.

020 with X30.

X35 of 020 coordinate instead.

045 with X30.

084, the outline outside having car of essence of life again next can obtain requirement measure Φ 35.

020mm and Φ 30.

020mm. If measure Φ of two important measure 30 ㎜ of 35 ㎜ and Φ , it is Φ respectively 35.

307mm and Φ 30.

334mm, criterion: δ 1=35.

307-35.

020-0.

3=-0.

2=30 of δ of 013mm 　 　 .

334-30.

020-0.

3=0.

1 ≠ of δ of 014mm 　 　 2 　 of δ at this moment, we should be only in block of finish machining of this cutting tool corresponding X35.

020 with X30.

X35 of 020 coordinate instead.

033 with X30.

006, the outline outside having car of essence of life again next can obtain requirement measure Φ 35.

020mm and Φ 30.

020mm. (3) exemple 3 cars cartography shows axial part 3 times, fine vehicle surplus is 0.

2mm, to make the exterior surface roughness after fine vehicle amounts to blueprint requirement, we enter memory of cutting tool wear and tear before the outline outside thick car in, in be worth the X of the wear and tear of fine vehicle cutting tool, add 0.

2, have car of essence of life to workpiece after that, detect exterior surface roughness is worth, look to whether accord with a requirement, if accord with a requirement, the value of X wear and tear that has this essence lathe tool is decreased 0.

2, again fine vehicle can win requirement measure; If do not accord with a requirement, adjust cutting dosage to be like feed or main shaft rotate speed (or cutting speed) , the value of X wear and tear that has this essence lathe tool next is decreased 0.

2, again fine vehicle can win requirement measure. 3.

The problem 　 that should notice (1) above is when process designing, there should be craft sex to suspend instruction M00 after car of essence of life is being reached between wide choice vehicle, control earning outcome very hard otherwise. (2) the X of spare parts radial that above is the outline outside be aimed at only namely applied citing of direction, to axial namely Z direction as much applicable. (3) internally the spare parts of outline as much applicable, it is cutting tool only rub the value of the X in bad news is negative worth, z value sign is changeless. (4) what special need points out is, be inside the car or outside when whorl, because be,examine with whorl plug guage or ring gauge its are eligible, belong to measure integratedly, reason needs to set the value of the X in wear and tear into the negative pitch of whorl or pitch more, the value of the X in changing wear and tear gradually (the absolute value that the X in reducing wear and tear is worth) the turning task that will finish whorl. (5) what what want a specification is, what above is aimed at is to be used only can worry situation of hard alloy cutting tool again, do not involve radius of point of a knife to compensate R and T of azimuth of point of a knife, if use cutting tool of numerical control of machine clip type, radius of point of a knife compensates R and T of direction of point of a knife to had been installed, the effect will be better. CNC Milling