The economic analysis of sheet of numerical control machine to fixed position function

Time:2023-06-29 13:48:26
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source:AMANCIO CNC Machining

The single way of numerical control machine tool locates the function also calls exact location the function, general abbreviation is one-way fixed position. The index accuses reference axis with beforehand a direction of set finishs fixed position, orientation way and athletic way have nothing to do, express with G60 in preparing a function. The executive process of 1 one-way fixed position is shown like plan institute, if be in the block that chooses location to B from A dot,dictated G60, CNC first the relation of the orientation way of differentiate set and the athletic way that A chooses B. If way is opposite, dictate athletic component walks along a paragraph to cross impulse L more, arrive at B ' finish fixed position to B dot reversely again; When way is same, also want to nod L place to stop in distance B, finish fixed position ahead again. Orientation way and spend impulse bulk by parameter set. Think commonly, eliminate clearance to undertake nicety locates when need, or the Kong Shi that machines precision to be close to precision of machine tool fixed position, should use function of G60 of one-way fixed position. The fixed position process when the dotted line of fixed position process when solid line states way is opposite states way is same we are in the practical effect test and verify of function of 2 one-way fixed position when this function is being used on machining center, discovery is become of set cross impulse too hour, error of retrorse fixed position is bigger, and overall performance is owe the journey. After increasing impulse set to be worth some, the effect that uses this function and use G00 of fast fixed position to do not have distinction. With to fixed position when, of set cross impulse size not to affect position result, do not have distinction with use G00. Subordinate list is the data that does test of one-way fixed position in axis of X of machining center of a V600 vertical. This axis controls shift for workbench, working mesa accumulates 800mm × 400mm, use two cast-iron guide that stick model deputy, 40mm of diameter of ball guide screw, two end secure bearing and beforehand drawing, use means of half closed-loop control. Fixed position is apart from 200mm, use instruction G60 respectively retrorse, G60 is the same as to, retrorse, G00 is the same as G00 to, the condition carries to leave the fixed position that finish in fast sky. In the watch 0.

The error that 005mm controls is belonged to change be worth random sex error. Can see, when impulse 2mm locates reversely, set arose too 0.

04 ～ 0.

The error of negative fixed position of 02mm. When crossing impulse to be more than 3mm to fixed position and set together, fixed position error does not have distinction with use G00. Means of data of test of one-way fixed position crosses X axis impulse 0.

5123481220G60 is retrorse 199.

968199.

972199.

981199.

994199.

998200.

001200.

003199.

998G60 is the same as to 200.

003200.

001200.

001199.

997200.

001199.

998200.

002200.

003G00 is retrorse 200.

001200.

003200.

003199.

998199.

999200.

002200.

001G00 is the same as to 199.

997200.

001200.

003200.

001200.

003200.

001200.

003199.

9993 tests result analyses system of contemporary numerical control to have clearance to compensate a function, when numerical control axis accepts retrorse motion to dictate, clearance compensates software to produce a certain quantity of compensation pulse automatically, make athletic component is crossed clearance and after be out of shape, again to appoint bit of shift. Say from this meaning, g60 eliminates the action of backlash to do not have real significance. Accordingly, over- when impulse is bigger, the effect that use G60 locates reversely and G00 locate reversely and G00 does not have distinction with the effect to fixed position. Cross impulse set when the value is lesser, g60 retrorse fixed position appears owe the journey (go less namely) be out of shape with the laziness of feed system about. At present the market most machine tool of cheap numerical control takes kind of half closed-loop control commonly in all-pervading, positional feedback signal is taken from axis of servo electric machinery or axis of ball guide screw. Feed system stiffness is not worth or have power of change, attrition the size of the fluctuant, force when adding decelerate, contact that because exterior surface roughness and hardness are inhomogenous,causes is out of shape the influence that waits for an element does not have operating ring of buy of the v/arc be on the throne that be included inside. When the machine tool leaves factory, the condition carries to fall to choose location to a certain number of targets in fast sky. Distance of average order punctuation is more than 50mm, inside this paragraph of journey, athletic component enough accelerates the rate of fast fixed position. Measure next give this specific requirement to issue positive and negative of each eye punctuation to the fixed position error when, decide clearance compensation and pitch error compensate numerical value from this, stock CNC storage, after regarding as, the error when moving automatically amends information. Because this machine tool leaves factory,the precision circumstance after still included effect of metabolic of laziness of system of the feed below specific requirement. Say for " laziness is out of shape " , because athletic component stops speed to be,be 0 hind, be out of shape still exist, until move to just smash state of this kind of balance next time. The laziness that narrates a problem to concern with article place is out of shape change of the force when basically change by attrition force and adding decelerate is caused. Should cross impulse set to be worth lesser, when using G60 to locate reversely, if place of graph solid line is shown, a nods B ' the space of the dot is larger, athletic component can accelerate rate of fast fixed position. Be close to B ' in the decelerate process of the dot, feed system suffers the influence of force to produce drawing, stored bigger deflection. In B ' when the dot is retrorse, CNC software compensates circuit to add cost of a compensation automatically. In some sense, this value is from B ' the force when the attrition force that orders a fast position position to fall to B and decelerate forms below joint action, it is A the dot is nodded to B and B ' the poor value of the inert deflection that nods two drawing between B dot. But as a result of B ' the dot nods a distance to B too small, component shift rate is very low, the attrition force of generation and decelerate force and the conditional photograph that clearance determines to compensate a value before leaving factory go very far. The backlash that joins at this moment compensates a value to did not rise to compensate action, b point is negotiated when causing a component to stop instead, form error of negative fixed position. Ying Shen of machine tool of 4 conclusion numerical control uses function of G60 of one-way fixed position, general use G00 can. When using function of one-way fixed position, impulse set should pass in examination parameter the value is enough big. Count experiment according to us, cross impulse reasonable value and speed of fast fixed position are concerned, desirable L ≥ V/5000(mm) , among them V is speed of fast fixed position (Mm/min) . Because lack quantitative analysis and thorough research, the place in article narrates the reason that the journey owes when one-way fixed position is retrorse and the computation of the least value that cross impulse to still have the place of deliberate, greeting reader offers precious opinion. CNC Milling CNC Machining