Shallow talk about numerical control machine tool to machine complex part, how to undertake cutting tool is compensated, escape mine field

Cutting tool position amends the part that machines same outline dimension when the cutting tool that adopts different measure, or because the cutting tool of same name dimension changes knife readjustments, wear away and cutting force makes workpiece, cutting tool, machine tool is out of shape when causing work measure to change, give eligible part for treatment, must undertake cutting tool position is compensated. If plan institute is shown, the tool carrier of lathe contains the cutting tool of different measurement. The central position that establishs graphic representation tool carrier is the dot changing a knife of each cutting tool, nod the process designing start that is all cutting tool with the B of point of a knife of a cutting tool. When changing 2 cutting tool to machine, the point of a knife of 2 cutting tool chooses the place in C, want to apply A, B the motion that the coordinate value 2 o'clock will come to come true to nod A from C, the coordinate that must know B dot and C are nodded needs a value, use this difference to be worth pair of B to undertake correction to the displacement quantity of A, can come true to arrive from C the motion of A. From above the analysis can see, numerical control system undertakes cutting tool position is compensated, use knife filling value to fill to the knife namely the increment size that builds block undertakes adding correction, to knife filling cancel paragraph increment size undertakes decreasing correction. A knife here is standard knife, the poor I of the input before we should be being machined only and standard knife, Ks is OK. Below this kind of circumstance, after standard knife wears away, the knife in whole knife library fills to want a change. For this, datum mark of some compensatory of position of cutting tool of requirement of numerical control system are cutting tool relevant point. Accordingly, every want cutting tool to input I, Ko, among them I, K, it is the positional difference that point of a knife nods related opposite cutting tool. 2.

Cutting tool radius is compensated (the systematic compensation that 1) does not have cutting tool radius to compensate a function is in normally in process designing, regarding point of a knife is one by one dot, however the to raise point of a knife intensity in treatment of cutting of effective numerical control, want to learn UG process designing to be able to add QQ group data of the 304214709 study that get and course, reduce treatment surface surface roughness, place of point of a knife transfers into circular arc blade. Inside cutting aperture, outside when circle and end panel, circular arc of point of a knife does not affect its dimension, figure, but when cutting cone and circular arc, can have caused cut or cut a phenomenon less. Can compensate a function to eliminate an error with radius of point of a knife right now. System of simple and easy numerical control does not have radius to compensate a function, accordingly, ask when spare parts precision taller and have again conic or when circular arc surface, or presses process designing of center of circular arc of point of a knife, or is in local undertake compensating computation, will eliminate the error that radius of point of a knife causes. 1) machines lathe of cone numerical control to always press dot of ” of “ hypothesis point of a knife to be opposite by process designing of fictitious point of a knife knife, the dot removing a knife that makes position of point of a knife and program medium (or the dot that change a knife) coincide. Alleged hypothesis point of a knife is shown like graph 3-73 place, b is round head lathe tool, p nods point of a knife of hypothesis of knife of the head that it is a circle, be equivalent to the dot of point of a knife of knife of the cusp in A graph. If if graph 3-74 place shows shift of workpiece outline AB,fictitious point of a knife is machined, namely P, p and AB coincide, press AB dimension process designing, inevitable generation owes cut area ABCD in graph A, cause rudimental error. Because this presses graph B place to show, make the cutting site of lathe tool changes to AB, move along AB, can avoid rudimental error thereby, but at this moment P of contrail of fictitious point of a knife, p and outline produce error AX and NZ respectively in X direction and Z direction. When the AB of surface of protruding sunken circular arc that if be R by radius of turning of process designing of fictitious point of a knife,2) machines circular arc by process designing of fictitious point of a knife, the circumstance that if graph 3-75 place is shown,can appear. In the graph (the convex arc that A) is R for turning radius, as a result of the existence of R, criterion the circular arc appearance that the circular arc contrail that dot of P of point of a knife walks along is not work place requirement. Its the centre of a circle is “O” , radius is “R+r” , right now process designing personnel still undertakes process designing by dot of P of fictitious point of a knife, take no account of the influence of radius of circular arc of point of a knife, namely outline of wide solid line should undertake process designing by parameter of line of the false or true in the graph. But before the requirement is machined, should fill in the knife unplug code dish go up Z to with X to add R of a compensation respectively. Manage together, in cutting sunken circular arc, when the 3-75 (b) that be like a graph, be in X to with Z to decrease R of a compensation respectively. 3) does not have cutting tool radius to compensate numerical control system of the function by process designing of contrail of center of circular arc of point of a knife, divide outside pressing process designing of data of contrail of fictitious point of a knife, still can press process designing of knife heart contrail. Be like plan institute to show handle part is formed by 3 paragraphs of convex arc and sunken circular arc, mark of 3 paragraphs of when can show with place of contrail of outline dotted line at this moment equidistant lines undertakes process designing, namely O1 round radius is R1+r, 02 round radius are R2+t, 03 round radius are R3-r, the terminal coordinate of 3 paragraphs of circular arc by equidistant relation of point of tangency is gotten. Process designing of this kind of method is more intuitionistic, often be used. (The systematic compensation that 2) has cutting tool radius to compensate a function controls a system in advanced now numerical control lathe, go to the lavatory to make process designing simple, numerical control lathe installed radius of circular arc of point of a knife to compensate a function commonly, and can the actual condition according to point of a knife, choose a knife dot contrail, process designing and compensation are very convenient. Compensate numerical control system of the function to having cutting tool radius, when process designing, the real profile process designing that should press a spare parts only can, and need not move according to cutting tool center orbit process designing. Radius of use cutting tool amends a statement, input cutting tool radius by hand on Control Panel _ , numerical control device can be calculated automatically a contrail of cutting tool center, move by contrail of cutting tool center. After carrying out cutting tool radius to compensate namely, cutting tool is automatic radius of a cutting tool is worth deviate workpiece outline, machine the workpiece outline of requirement giving place thereby. When using a machine tool to undertake radius of point of a knife is compensated automatically, need uses statement of G40, G41, G42. When the system carries out the program that contains T code to dictate, was to gain mark of address of register of cutting tool compensatory from which merely (include compensation of position of cutting tool geometry and) of size of cutting tool radius among them, can not begin to carry out radius of point of a knife to compensate right now. Encounter G41, G42, G40 in the program only when the instruction, just begin to collect data from inside knife library and carry out corresponding knife diameter to compensate. CNC Milling