The knife in how applying CNC Machining neatly fills value

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  • source:GAENOR CNC Machining
Summary: Cutting tool compensation is the main function on numerical control machine tool, reasonable use cutting tool compensates a function to there is very main effect in CNC Machining. How does the article apply knife filling value to undertake CNC Machining neatly, elaborate in order to make sure the problem such as the efficient sex of CNC Machining and accuracy undertook. Keyword: The cutting tool compensation in knife filling value, CNC Machining CNC Machining basically has compensation of cutting tool radius and compensation of cutting tool length, function of compensatory of cutting tool radius is to be able to make we turn into to undertake process designing by workpiece outline by process designing of contrail of the heart that press a knife, such leave out the artificial computation of knife heart contrail, simplified not only process designing and the accuracy that increased an order, cutting tool length is compensated (effective to 2 coordinate and CNC Machining of 3 coordinate linkage, right 4, CNC Machining of 5 coordinate linkage is invalid) the function is to be able to make we by by cutting tool length process designing of fixed position datum mark transforms undertake process designing to press point of a knife or knife heart, simplified likewise process designing, raised accuracy. One, the variation that how uses knife filling value to get used to cutting tool neatly is in the automatic treatment of the spare parts, of cutting tool wear away, be ground again or change new knife is to often happen, apply knife filling value to be able to avoid completely to wear away when cutting tool neatly, the work that new modification program needs when be ground again or changing, in process of spare parts treatment, because cutting tool wears away and make its radius decrescent, if cause workpiece error,exceed its workpiece public errand to cannot satisfy treatment requirement. Filling value is the knife that installs so suppose R1, after the treatment that passes period of time, of cutting tool radius reduce a quantity to be Δ ; The knife that can revise this cutting tool only right now fills value by Δ of original R1 instead R2(r2= R1- ) if pursue 1 and need not change a course. Same, after cutting tool is ground again Yi Kezhao manages here. Change when need the radius value that new cutting tool can use when cutting tool fills as the knife filling value undertakes the knife that replaces original order treatment. This shows, because the knife fills,the change of the value got used to the change of cutting tool. From this process designing personnel still can fall in the circumstance of dimension of sealed and actual use cutting tool, assume first of cutting tool probably dimension will undertake process designing, when be being machined actually, to radius compensation can replace radius of hypothesis cutting tool with radius of actual cutting tool; To length compensation; Input of cost of length of will actual use cutting tool arrives in register can. Graph 1 cutting tool wears away, the machine program after be ground again or changing is changeless 2, the thick, precision work that how handles knife filling value to complete work neatly uses knife filling value to be able to implement same program, the rough machining of same cutting tool and finish machining, its compensate a method to be: If pursue 2: Set cutting tool radius to be R, finish machining surplus is △ . When rough machining, input D=2 (r+ A) of cutting tool diameter, give dotted line outline to finish rough machining to treatment; When finish machining, same process, same cutting tool needs to input D=2r of cutting tool diameter only, machine a solid line outline, the finish machining that finish. If still need semifinishing machining, want to decide capacity of good semifinishing machining only, also but follow the lead of this law. Graph 2 use compensation of cutting tool radius to undertake nextpage3 of thick, finish machining, how to apply knife filling value to if pursue,assure outline dimension precision neatly 3, because machining complex is put in certain stiffness, below milling knife action, cutting tool lets knife phenomenon in the existence in actual cutting process, or engine year long the itself error that disrepair causes and the error that causes real profile dimension and academic outline dimension finally. The size that allows knife amount among them depends on the stiffness of machining complex and element be waitinged for by treatment material. Normally, in rough machining, when semifinishing machining, because cutting surplus is larger and inhomogenous, amount letting a knife is larger; When having precision work, mental allowance is relatively stable, can get the △ of quantity letting a knife when finish machining through actual measurement conveniently. Specific operation method is: Can adopt the measure of actual measurement workpiece, get the △ of quantity letting a knife when finish machining; Higher to the requirement treatment position, but the force when actual measurement finish machining, application measures power instrument to determine to give cutting surplus in the program, the dynamic milling force below cutting speed. Below static circumstance, can be load with the milling power that already measured, measure those who give cutting tool to let a knife measure △ . After this can revise the knife in register to fill according to letting a knife measure △ value. Such but the academic outline dimension of complete basis spare parts writes finish machining program, below the condition that does not change machine program, the deviation between the as a result of machining complex allows knife or place of error of machine tool itself to cause workpiece outline measure in compensate treatment with knife filling value and real measure, raise outline to machine precision thereby. Graph 3 knives filling value and actual cutting outline 4, before how applying knife filling value to simplify to operate CNC Machining to the knife neatly to the knife the job is a careful work, must accurate without by accident, when using many knife to machine same part, the force that must set each knife through coming to the knife fills value. In order to decide in its workpiece coordinate fastens medium exact position. It is normally serve as with the 1st knife fiducial, find out the others to each knife photograph is measured to the deflection of the 1st knife and input corresponding knife to fill register. But should encounter fiducial knife (namely the 1st) when need changes or blade is ground, can change subsequently to knife datum mark, the others fills the knife of the knife each the value also can produce change accordingly, all need to be opposite afresh knife, immediate impact machines efficiency in production of reason batch treatment, bring a lot of inconvenience. For this, can be opposite when the knife, what be ideal with the fiducial knife position that installs the 1st times is fiducial to the knife, change after fiducial knife, can be knife filling value relative to the deviation value at fiducial knife position, the knife that revises the 1st knife fills value can, such, standard position did not produce change, the others also need not be opposite the knife afresh each knife. Manage together, when when the others each need the knife to be ground again or changing, also need to be able to be finished to the knife only. Before program of work out numerical control, should the structural characteristic according to the spare parts, the fiducial knife with accurate, reasonable predefine, the right choice of fiducial knife and set, can give process designing, right knife, revise and machine midway to change knife, blade to grind bring very easy. Fiducial knife should choose not to need commonly often blade is ground, intensity the knife with tall, good wear-resisting, average elephant gets flower, center getting, reamer or other and complex cutting tool should not be fiducial knife. 5, when applying knife filling process designing, should have prevented when cutting a problem to fill in applied knife, the part that because process designing is undeserved,should avoid and causes cuts a phenomenon too. According to principle of knife filling processing, there are 3 blocks commonly in process of knife filling processing flowing, due in the program after cutting tool radius is compensated those who appoint planar axis is mobile paragraph of instruction. Cut occurrence feed the issue too otherwise, often appear in process designing the following circumstance. 1, there is block of 2 auxiliary functions between two exercise statement, so, unavailable when knife filling computation outline of 2 photographs adjacent paragraph information, had caused likely cut a phenomenon, be like: ... ... if the graph is shown 4 times,its correspondence of N 15 G91 X100 N16 M08 N17 M53 N18 G01 Y-50 N19 X65 machines a process, the contrail that is in in corner turns into from A, > B, because executive N16 is in in A,this is, n17 two paragraphs hind of generation cut a phenomenon too. Graph in 4 treatment cut phenomenal Nextpage2 too, move in two when there is a motion to dictate for the motion of 0 between the instruction, because move to do not have information of spare parts outline for the block of 0, when accordingly the knife fills, this meeting has arisen to cut a phenomenon, be like: ... ... if process of treatment of its correspondence of N15 G91 X100 N16 X0 N17 Y-50 pursues 5, be in top turning point, its cutting contrail is A, ＞ B, because be between instruction of two motion cutting,this is, a displacement dictates for the motion of 0 (N16 X0) , as a result falls at winning the case of enough outline information in the system, generation cuts a phenomenon too. Graph in 5 treatment cut a phenomenon too of course, if an auxiliary function points to,dictate between two exercise statement and when a displacement dictates for the motion of 0, also can have arisen to cut a phenomenon. 3, the motion that planar axis did not appoint in below two paragraphs of block after compensation of cutting tool radius is started dictates paragraph when, same meeting has arisen to cut a phenomenon, be like: ... ... N05 G91 G17 G00 M03 N06 G41 X20 Y10 D0l N07 Z-98 (dot removing a knife is apart from workpiece surface 100mm, cutting tool speed is in to 2mm of workpiece surface upper part) N08 G01 Z-12 X100 (cut deep L0mm) N09 Y50 N10 X20... ... of its cutting if the graph is shown 6 times,cut a phenomenon too, its reason is to be in after N05 Duan Qi moves cutting tool radius to compensate, can read in below two paragraphs of N06 only, n07 program, and Z axis is not axis of compensation of cutting tool radius, cannot determine ongoing direction, make cutting tool center direct nod to A from S dot shift, had arisen to cut a phenomenon thereby. Graph in 6 treatment cut phenomenal anyhow too, knife filling value is having very main effect in CNC Machining. Agile, use knife filling value reasonably, combine knife filling principle to weave the program is to make sure CNC Machining is efficient correctly, the main factor of high accuracy. CNC Milling CNC Machining