In machine program work out, method, skill is used proper, to assure and improving the treatment of numerical control machine tool precision has important sense. The author is in long-term practice, accumulated experience of a few process designing, the introduction is as follows.

The 1 effect that removes tolerancepublic errand to take the place

A lot of dimension of the spare parts are tagged have noncombatant duty, and the place that tolerancepublic errand takes agrees impossibly, and numerical control program weaves by spare parts outline commonly, press the basic measure work out of the spare parts namely, oversight the effect that tolerancepublic errand takes the place. Such, although the precision of numerical control machine tool is very tall, the part that treatment gives does not accord with its dimension public errand likely also to ask. If the graph shows a part 1 times, Ø40 dimension is made for basic shaft, Ø35 dimension is base aperture makes transition fit, Ø25 dimension is base aperture has been made be filled with cooperate, the public errand of 3 dimension takes the position to differ, if process designing still presses his basic measure Ø40, Ø35 and Ø25, and the influence that takes no account of tolerancepublic errand to take the place, make treatment of a certain dimension does not accord with a requirement possibly. The method that solves a problem has 2 kinds:

Press basic measure process designing, with radius compensation consideration public errand takes the position to still press a spare parts namely basic measure computation and process designing, use same lathe tool to machine everywhere outside round, and when machining different public errand to take positional measure, use different cutting tool radius to compensate a value. With this kind of method, should know radius of circular arc of point of a knife first (contrail of treatment of this spare parts and X axis, Z axis is parallel, but need not know) of radius of circular arc of point of a knife, use inconvenience so, and can apply to system of partial numerical control only.

Change basic measure and public errand to take the position to be namely below the premise that makes sure size of spare parts maximum is changeless, adjust basic measure and public errand to take the place. Adjust by belt of symmetrical public errand commonly, if the basic measure after adjusting and public errand pursue 2. The basic measure after adjusting is pressed when process designing undertake, use when finish machining so same lathe tool, identical knife fills value (this exemple treatment contrail and X axis, Z axis is parallel, but not knife filling) , can assure to machine precision. Of course, if the part is final even finish machining (grind) like essence of life, to make sure grinding surplus is abundant, also can increase basic measure in a way (right now, tolerancepublic errand is taken with respect to asymmetry) .

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