Cutting tool radius compensates G40G41G42 of principle and instruction of compensation of cutting tool radius

Why be compensation of cutting tool radius? Numerical control machine tool is in outline treatment process, its place pilot is the contrail of cutting tool center, and weave by spare parts outline when user process designing, the part that wants to machine place consequently, when undertaking outline is machined, cutting tool center must radius of a cutting tool is worth deflection. The program that numerical control device weaves according to spare parts outline and beforehand the parameter of cutting tool radius of set, the function that can create contrail of cutting tool center automatically in real time calls cutting tool radius to compensate a function. 2.

The implementation of main use ① of function of compensation of cutting tool radius is opposite according to process designing contrail the control of contrail of cutting tool center. ② realizes compensation of error of cutting tool radius. ③ reduces the workload of to program of thick, finish machining. 3.

Adjacent of photograph of commonly used method uses compensatory of cutting tool radius between the contrail of cutting tool center of two paragraphs of outline circular arc join. Photograph adjacent uses linear connection between the contrail of cutting tool center of two paragraphs of outline. (1) B knife filling advantage: √ algorithm is simple, realize defect easily: When pointed horn of × outer outline is machined, because outline pointed horn is in, be in cutting position from beginning to end, the craft sex that pointed horn machines is poor. × inside when outline pointed horn is machined, process designing personnel must insert a radius to be more than the circular arc of cutting tool radius in spare parts outline, such ability avoid to had arisen cut. (2) C knife fills to be mixed by basis of numerical control system the process designing contrail of real profile just the same, the node of contrail of center of cutting tool of adjacent of photograph of direct cipher out, make to original central contrail again next stretchy or the correction that shorten. Sex of √ pointed horn is good. When the outline inside √ is machined, lest had arisen,cut. (3) B knife fills to fill to distinguish quite with C knife: B knife treatment involving the use of tonics to restore the patient's health is when contrail of center of affirmatory cutting tool, handle a paragraph of contrail, those who use is to read a paragraph, calculate a paragraph, walk along a paragraph processing technique again. Such, the contrail of below one paragraph of treatment that cannot predict is opposite an influence of paragraph of treatment contrail. Distinction: C knife fills adoption method is processing of pair of two Duan Jin travel, namely first pretreatment this paragraph, decide contrail of center of its cutting tool according to issueing a paragraph square all along next paragraph transfer condition, finished thereby this paragraph processing of knife complementary operation. 2, principle of job of compensatory of cutting tool radius 1.

The process that compensation of radius of cutting tool of process of job of compensatory of cutting tool radius carries out can divide commonly for 3 paces: (1) the knife fills build (2) the knife fills undertake (3) note of function of compensation of radius of use cutting tool of knife filling cancel 1, must be built in motion and cancel a knife to fill, g41/G42 does not have the function that makes cutting tool moves; 2, cannot be built on circular arc block and cancel a knife to fill; Function of compensation of cutting tool radius can be only inside the interpolation plane of outline become effective, and do not act well on the other reference axis outside removing interpolation plane; 3, fill in the knife in executive process, cannot have successive the instruction that two paragraphs of instructions move to be not interpolation plane, had arisen to cut otherwise. 2.

C knife compensatory turns receive form and transfer means (1) turn receive a form to be in common CNC unit, all have circular arc and linear interpolation two kinds of functions. Because C knife fills,use transfer point-blank, in machining a process actually, as around the line of contrail of two process designing different, also meet what generation differs turn accept a case: (2) transfer means vector included angleαShow contrail of two process designing is in nodical place to be not treatment side (workpiece side) the α of vector included angle of contrail of two paragraphs of programs mixes basis of included angle α of knife filling direction different, again the following kinds turn receive transfer means: Shorten model: Contrail of center of 360° cutting tool of ＜ of 180°≤α of vector included angle is short the transition at process designing contrail means. Stretchy model: Contrail of center of 180° cutting tool of ＜ of 90°≤α of vector included angle grows the transition at process designing contrail means. Insert model: 90° of ＜ of α of vector included angle inserts a paragraph to transfer point-blank between contrail of center of two paragraphs of cutting tool means. Shorten model: ＜ of 180°≤α of vector included angle 360°Contrail of cutting tool center is short the transition at process designing contrail means. Stretchy model: ＜ of 90°≤α of vector included angle 180°Contrail of cutting tool center grows the transition at process designing contrail means. Insert model: ＜ of α of vector included angle 90°One paragraph is inserted to transfer point-blank between contrail of center of two paragraphs of cutting tool means. Shorten model: 180°≤α ＜ 360°Stretchy model: 90°≤α ＜ 180°Insert model: α ＜ 90°Shorten model: 180°≤α ＜ 360° is stretchy model: 90°≤α ＜ 180°Insert model: α ＜ 90°3, the cuts differentiate to should be machined too outline in machining a process is linear paragraph when, if cutting tool radius has been chosen big, cut generation the phenomenon too. When reading in CD of process designing contrail, be about to undertake correction to B’C’ of contrail of center of upside cutting tool, center of affirmatory cutting tool should move to be nodded to C′ from B′ dot. Apparent, be sure to produce what place of part of the shadow that be like a graph shows to cross cutting at this moment. 1.

When linear treatment cut differentiate method to be able to pass what process designing vector and the scalar quantity of the correction vector that its answer relatively accumulate to be being lost too undertake differentiate. Going up in the graph, BC is process designing vector, for the correction vector of BC correspondence, α is the included angle between them. Criterion: Scalar quantity accumulating is apparent, when (namely 90o<α<270o) when, cutting tool is about to carry on the back move to process designing contrail, had caused cutting. The α=180o in pursueing on, so sure generation crosses cutting. 2.

When circular arc is machined cross cutting differentiate inside outline circular arc is machined (the order that circular arc processes is G41G03 or G42G02) when, be like RD of chosen cutting tool radius too big, exceeded the R of circular arc radius that requires treatment, can have produced cutting so. Cross cutting phenomenon to happen in transfer the form is shorten model below the circumstance, consequently can according to this one principle, will judge the condition that has produced cutting, had designed cutting differentiate program accordingly. Set cutting tool to begin the position to be apart from 50mm of workpiece surface upper part, cutting deepness is 8. N01 G91 G41 G00 X20.

0Y10.

0N02 Z-48.

0;N03 G01 Z-10.

0F200;N04 Y30.

0;N05 X30.

0;N06 Y-20.

0;N07 X-40.

0;N08 G00 Z58.

0;N09 G40 X-10.

0Y-20.

0;N10 M02;N05 G91 X60.

0; N06 M08;N07 M09; N08 Y-15.

0; N09 X40.

0; machines AB outline when N05 block, read in N06 and N07 at the same time two paragraphs, because these two paragraphs are auxiliary function to dictate, do not make rough sketch of BC giving an edge perpendicular vector, and arrive at S to nod directly, had caused cut a phenomenon. Compensation of cutting tool radius dictates the form is as follows: G17 G41(or G42) G00(or G01) X Y D or G18 G41(or G42) G00(or G01) X Z D or G19 G41(or G42) G00(or G01) Y Z D; G40 (a) (b) pursues 6.

G41 of direction of compensation of 1 cutting tool is opposite advance at cutting tool side of square towards the left undertakes compensating, call Zun Dao to fill. If pursue 6.

1a place is shown. Be equivalent to arranging mill at this moment. G42 is undertake compensating on the right side of ongoing to cutting tool direction, call right knife to fill. If pursue 6.

2b place is shown. Be equivalent to going against mill at this moment. From surface roughness of precision of cutting tool life, treatment, surface character, suitable mill effect is better, accordingly G41 is used more. D is address of knife filling date, it is the memory address that cutting tool radius records in the system, the numerical value that follows from the back is cutting tool date, with numerical value of compensatory of radius of the cutting tool in call memory. Address of knife filling date can have D01-D99 in all 100 addresses. Among them value can input corresponding in watch of memory cutting tool cutting tool date beforehand with MDI means locally. When undertaking cutting tool is compensated, want to choose knife filling plane with G17/G18/G19, default condition is XY plane. G40 is to cancel cutting tool radius to compensate a function, instruction of compensatory of cutting tool radius cancels to all be G40 on all plane. G40, g41, g42 is mode code, they can be cancelled each other. Use cutting tool compensates functional advantage to depend on: · need not consider the radius of cutting tool when process designing, undertake process designing to dimension by design place directly, the radius that cutting tool inputs when wanting to be being machined actually only is worth can. · can make the program of rough machining simplifies. Use compensation of conscious radius of change cutting tool, usable and same cutting tool, same process, different cutting surplus completes treatment. Union pursues below 6.

The 2 motion that will introduce a knife to fill. Graph 6.

2 knives filling movement presses increment means process designing: O0001N10 G54 G91 G17 G00 M03 G17 designates Dao Buping area (XOY is planar) N20 G41 X20.

0Y10.

0D01 builds a knife to fill (knife filling date is 01) N30 G01 Y40.

0F200N40 X30.

0N50 Y-30.

0N60 X-40.

0N70 G00 G40 X-10.

0Y-20.

0M05 removes knife filling N80 M02 presses very kind process designing: O0002N10 G54 G90 G17 G00 M03 G17 designates Dao Buping area (XOY is planar) N20 G41 X20.

0Y10.

0D01 builds a knife to fill (knife filling date is 01) N30 G01 Y50.

0F200N40 X50.

0N50 Y20.

0N60 X10.

0N70 G00 G40 X0 Y0 M05 removes filling movement of knife of knife filling N80 M02 is: 1, the phase that start 2, knife filling condition 3, cancel a knife to fill here is special reminding those who want an attention is, the knife after the phase that start begins fills in condition, the shift that if be put in what have two paragraphs of above to do not have mobile instruction or existence blame,appoints planar axis dictates paragraph, produce feed inadequacy or feed out of tolerance possibly. Because enter cutting tool state,its reason is hind, can numerate only two successive paragraphs, these two paragraphs do not have feed, also do not make give vector, cannot determine ongoing direction. CNC Milling CNC Machining