[summary] : The article from education set out actually, be aimed at the practice that lathe of student numerical control handles, the account that hits a car produces in summing up unit process of cargo bandling of numerical control lathe, put forward practical settlement method, integration of theory with practice, in reflecting a profession to teach, high skill talent develops the concept in the process and teaching method.
[keyword] : Numerical control lathe produces collision reason to avoid measure
Price of numerical control lathe is high, in exercitation education, if wait for a reason as a result of student process designing, operation, make machine tool happening collides, touch bad work gently, attaint cutting tool; Make a machine tool local again damage, loss of accuracy, machine tool discards as useless, send the life security that endangers handlers very, its consequence is very serious. Oneself through coming for years the practice of careful research and exercitation education sets out, induce as follows now:
One, process designing is wrong at 0 o’clock
The person that is engaged in process designing of numerical control lathe knows, process designing 0 o’clock is measure of work of the decision in numerical control process designing
according to, if process designing appeared at 0 o’clock accident, so the possibility that numerical control lathe produces collision is very large. In the work that following graphs show 1 times:
Its program is:
If write G54 by accident,be G57 or G58, according to the regulation of process designing of numerical control lathe, two in coming from same group slant buy dimension (set by G57 or G58, G92) , call finally slant buy dimension (set by G92) effective. Its program turns into:
Criterion afore-mentioned results will be:
Slanted at 0 o’clock namely calorie of claw leaves only after buy3.8mm, in process designing, axial dimension wants to be less than only3.8mm, regular meeting occurrence lathe tool and card claw collide.
For this, must understand to slanted at 0 o’clock the detailed meaning that buy dictates, had used correctly slanted at 0 o’clock buy statement, prevent to produce phenomenon of collision of numerical control lathe.
2, there is the data that surmounts dimension blocking claw in the program
Above pursues 1 for exemple, process designing was to dimension of end panel blocking claw at 0 o’clock50mm, if axial dimension is apart from right
End panel distance exceeds50mm, if be 51, criterion lathe tool and card claw collide1mm. After to program ends reason, do not be eager to machine, want scrutiny whether does the numerical value of Z of all axial dimension exceed50mm.
3, when machine tool air runs, did not stretch calorie of claw, make tool carrier is far from chuck and tailstock
When the machine tool undertakes automatic loop air runs, if did not stretch calorie of claw, make tool carrier is far from chuck and tailstock, be like occurrence motion interference, produce collision extremely likely to block the phenomenon of claw or tailstock. If stretch calorie of claw, examine the coordinate cost of the program in time, or to having the numerical control lathe of function of imitate of cutting tool contrail, move tool carrier to tailstock and chuck between, below the premise that assures safety of tool carrier dislocation, lock up dead machine tool, reentry moves automatically for nothing all right, also can judge lathe tool to whether reach workpiece collision with the machine tool roughly, after having a problem certainly, fangke undertakes cutting is machined trying.
4, process designing is undeserved, generation collides
Because workpiece is special appearance, when requirement process designing into, retreat a knife to must be odd coordinate means, following
The graph shows work 3 times in:
Boring cutter machines Kong Shi, if use G00 to dictate mobile cutting tool is nodded to the target directly, process designing is as follows:
N0050Z of of G00 X19.0 – 25;
Such, if solid line place is shown,will naturally collide with workpiece happening in that way;
If odd coordinate divides a pace to move to eye punctuation, such process designing:
X19.0 of of of N0055 ;
Z of of of N0060 – 25;
If dotted line place is shown, avoided effectively to collide.
Pursue for instance again 4 in showing work, when the turning of the grooving that finish, need quick return to come
Ф100mmReach right from workpiece end panel100mmPlace, be like such process designing:
N0080 Z100.0 of G00 X100.0;
Because take oblique line,grooving knife is met and collide with spare parts step, although be in system of most numerical control, after executive G00 dictates, the actual contrail that cutting tool walks along is broken line, because G00 is fast,choose location again, lathe tool with the machine tool the rapiddest rate moves to be nodded to the target, the actual contrail of lathe tool shows dotted line share 5 times for the graph, it is a broken line namely, also should collide with workpiece happening.
Its accurate process designing method is as follows:
Following plan institute show the athletic contrail of cutting tool:
Quit grooving knife radial work first namely, next again axial shift comes end panel100mmPlace, can avoid effectively to collide.
5, mistake of process designing data or do not accord with a requirement, and caused collision
Lathe of some numerical control is decimally process designing, or already installed for decimally process designing, in next graphs 6 are shown
Below the circumstance:
Its program is:
X62.0 Z-35.0; of of N0100 G00
Although cutting tool takes broken line, also won’t collide with workpiece. But as a result of carelessness or other reason, write the program into following programs by accident:
Z of of X62 of of N0100 G00 – 35;
Z of of of X62 of of N0100 G00 – 35;
Numerical control system is met a coordinate word after 62 reach – 35 except with 1000 will handle, become namely:
N 0100G00 X0.062 Z-35.0;
N0100 Z of G00 X0.062 – 0.035;
Very apparent, grooving knife should collide with the circle outside workpiece or photograph of right end panel.
Collide to avoid this to plant, best method is emulated more namely, much examination, careful, fine young, find out in time apparently wrong or the data that does not accord with a requirement, amend in time.
6, the usage that not familiar process designing dictates, cause lathe tool and workpiece collision
In system of FANUC 0I, g71 (G73) the multiple and compound fixed loop of outline of work of vehicle of as thick as G70, fine, especially when G73 instruction and G70 are combined, if the graph shows 7 times:
When ending as a result of the loop, the ground of initial site selection that the return trip chooses is improper (see what A dot shows, on the low side) , cause the phenomenon that collides with work look when cutting tool returns to happen thereby. To prevent this kind of circumstance happening, the initial drop that should make the return trip is nodded only is proper drive up is nodded to B can.
7, what the dot that change a knife appoints is improper, produce collision
The dot that change a knife is chosen too close from workpiece or the other position that leave tailstock too close or leaves a machine tool is too nearly, tool carrier
Workpiece of incidental when dislocation collision or machine tool. Want to avoid this kind of circumstance happening, have to abide by those who change knife spot to choose a principle, change knife dot to must be between workpiece and tailstock namely, approach work as far as possible, and any place that tool carrier must not meet workpiece, tailstock and machine tool when dislocation.
8, answer reference point means to choose a mistake, cause collision
When some students are winding reference point, when choosing working way, do not see operation face plate, the operation square
Formula switch is chosen move in the hand (JOG) means, is not a reference point (REF) means, do not watch video screen again, not be to cause exceed Cheng to call the police, when be like farewell to consult, of reference axis early or late order is incorrect, cause collision tailstock phenomenon extremely easily to happen. To avoid this kind of circumstance happening, as long as the student is not serious, careful, careless, operate a machine tool by the regulation can.
9, did not answer reference point to cause collision happening
The coder of numerical control lathe has opposite coder and absolutely coder two kinds, install opposite encode to adding
Implement numerical control lathe is become machine tool electrify or after cutting off the power new and electrified or the memory that pair of reference point can lose after trouble removal restoration, right now, if do not undertake winding the operation of reference point, have pair of knives or automatic treatment, certainly will causes data to read clerical error by accident, cause lathe tool and workpiece or machine tool collision then.
Happen to prevent the collision of this kind of circumstance, want to wind reference point first by the regulation only, operate related reentry travel can.
Anyhow, the reason that numerical control lathe produces collision is very much, still have other condition besides, here
no longer one one give uncecessary details. To avoid collision happening effectively, when process designing and operation, requirement student is familiar with numerical control to machine craft, understand an instruction, hep machine tool handles a regulation, close process designing, microscope, operate a machine tool by formulary safety, must not boldly act.
Reference book book:
1, ” numerical control lathe grooms ” Yuan Feng Machinist trade publishing house
2, ” process designing of numerical control machine tool and operation ” (fascicule of numerical control lathe)
Labor and organization of office of teaching material of social security ministry write press of Chinese labor social security
3, ” numerical control lathe operates an elementary course ” press of science and technology of Cheng Meiling Anhui
4, ” numerical control uses crucial technology ” press of industry of Lou Rui electron
5, ” turning of numerical control machine tool processes technique of direct process designing ” press of industry of Sun Demao machinery