Machine tool of explore analyse numerical control causes treatment precision the reason of unusual breakdown

First exterior hind machine tool of internal numerical control is market mechanism, hydraulic pressure, electric the machine tool that is an organic whole, the fit of its defect also meets friend by this 3 person Baconian report comes out. Repair personnel to should be undertaken discharging checking by the one by one inside extroversion first, prevent optional ground open the envelop as far as possible, ravel, can expand otherwise illness, make precision of machine tool loss, drop function. 2.

First machinery hind is electric generally speaking, mechanical trouble detects more easily, and the diagnose of defect of numerical control system criterion somes difficulty is greater. Before illness is overhauled, principal attention broom mechanical defect, often can attain the result of get twice the result with half the effort. 3.

Below the break down condition that preexistence machine tool changes to cut off the power after Xian Jing, pass understanding, investigation, exam, analyse, think truly after nondestructive defect, just can give a machine tool electrify; Below locomotive operating mode, have dynamic investigation, check and exam, search illness. And to ruinous defect, must first after broom risk, square but electrify. 4.

First brief hind mixed and disorderly should present a variety of breakdown mutual crisscross is masked, when doing not know how to start temporarily, answer to handle brief issue first, the question with aftertreatment bigger difficulty. Often after brief problem is handled, the question with big difficulty becomes possibly also brief. 3, 　 of method of diagnose of defect of numerical control machine tool 1.

Direct way: (hope to hear ask cut) ask - the illness phenomenon of the machine tool, treatment state; Look - CRT calls the police information, call the police indicator light, the component such as capacitor is out of shape sootiness scorchs, protector is taken off buckle etc; Listen - unusual activity; Hear - flavour of electric component anxious paste and other peculiar smell; Feel - calorific, oscillation, the contact is undesirable wait. 2.

Parameter examines a way: Parameter is to deposit normally in RAM, sometimes batteries voltage is insufficient, the system is illogical for long report or exterior interference can make parameter desertions or disorder, should according to illness feature, examine and corrective concerned parameter. 3.

Keep apart a law: A few defect, be being distinguished hard is numerical control part, still servo system or mechanical part are formed, often choose segregation magic art. 4.

Congener exchange law reserves with what be the same as function board replace by the pattern plate with amiss doubt, or function identical pattern plate or unit are exchanged each other. 5.

Law of function program test G, m, s, t, all instruction of function writes a few small programs, run when diagnose defect these programs, can of differentiate function be short of break. 4, diagnose of defect of treatment precision abnormality and processing example 　 1.

Mechanical trouble causes appearance of defect of treatment precision abnormality: Machining center of vertical of a SV-1000, choose Frank system. In machining process of connecting rod mould, suddenly discover Z axis feed is abnormal, form at least the cutting accident of 1mm is measured (Z direction is cut too) . Illness diagnose: The understanding in investigation arrives, illness is to suddenly of fit. The machine tool is moved in the dot, it is normal that each axes below data-in method operation are moved to run in the hand, and it is normal to wind reference point, do not have any calling the police to hint, electric hold the possibility broom that accuses partial hard defect. Answer to basically undertake examining to one by one of the following respects. The machine program that when examining abnormality of machine tool precision, running paragraph, especially compensation of cutting tool length, machining coordinate is (G54-G59) corrective with business accounting. Method is moved to fall in the dot, repeat athletic Z axis, through inspecting, touch, listen, to diagnose of its movement condition, discover Z to athletic noise abnormality, nod quickly especially move, noise all the more is being shown. From this differentiate, mechanical respect may be put in danger. Examine precision of axis of machine tool Z. Shake with the hand pulse breaks out implement mobile Z axis, (its fold is 1 × surely of 100 block, namely every change one condition, electric machinery feed 0.

1mm) , cooperative dial gauge investigates the athletic condition of Z axis. Serve as initial drop after it is normal that one-way motion holds to to motion, pulse implement every change one condition, the practice interval D=d1=d2=d3= that axis of machine tool Z moves... =0.

1mm, clarify electric machinery movement is crackajack, fixed position precision is crackajack also. And come back on the change of displacement of motion of machine tool practice, can divide for 4 phase: (1) D1>d=0 of interval of machine tool motion.

1mm (slope is more than 1) ; (2) body is revealed for D1=0.

1mm>d2>d3 (slope is less than 1) ; (3) practice of machine tool organization did not move, body reveals the most normative retrorse gap; (4) interval of machine tool motion and pulse implement keep balance via deciding numerical value (slope is equal to 1) , the rehabilitation normal motion to the machine tool. No matter how undertake compensating to retrorse space, its reflect the feature that give is: Besides (3) outside level compensation, other each paragraphs of change still occurs, especially (1) level is austere the treatment precision that affects a machine tool. The discovery in compensation, interstitial compensation is bigger, (1) the interval with mobile phase is bigger also. Analyse afore-mentioned examining to think when to exist likelihood reason: It is electric machinery has abnormality, 2 it is mechanical respect amiss, 3 it is space of guide screw existence. For farther diagnose defect, electric machinery and guide screw complete come away, undertake examining to electric machinery and mechanical part respectively. Examining a result is electric machinery movement is normal; Be opposite the discovery in mechanical part diagnose, with the hand dish when moving guide screw, come back to move initiative have very big vacant feeling. And below regular state, should can feel bearing is orderly and the shift of smooth. Illness processing: Examine discovery through ravelling this bearing is damaged really, and ball falls off. Rehabilitation of the machine tool after replacing is normal. 2.

Hold accuse logic undeserved cause appearance of defect of treatment precision abnormality: The machining center that manufacturer of machine tool of a Shanghai produces, the system is Frank.

In machining a process, discover precision of axis of X of this machine tool is abnormal, precision error is the smallest for 0.

008mm, most greatly 1.

2mm.

Illness diagnose: In examining, the machine tool shows already according to asked to install G54 workpiece coordinate is. Data-in method operation is moved to fall in the hand, with G54 coordinate the department runs a paragraph of program namely " GOOG90G54X60.

OY70.

OF150; M30; " , after waiting for machine tool movement to end, show implement on the mechanical coordinate value that show is (X axis) " - 1025.

243 " , this are numeric below the record. Move method to fall in the hand next, the machine tool the dot uses other and arbitrary position, move data-in method to handle next movement in the hand again a moment ago block, after needing machine tool cut back, numerical value of coordinate of the machine tool when discovering this is shown for " - 1024.

891 " , the numerical value after be being fulfilled last time together differred quite 0.

352mm.

According to the method that takes a picture to be the same as, x rod the dot uses the position that moves to differ, repeat fulfill this block, and show implement on the numerical value that show differs somewhat (not stable) . Undertake be examininged carefully to X axis with dial gauge, the error that discovers mechanical azimuth carries out accident to be shown with the number is essential and common, think illness reason repeats fixed position mistake for X axis thereby too big. Undertake examining to the retrorse space of X axis and fixed position precision, compensate its accident value afresh, any effects are less than since the result. Consequently doubt grating feet reachs systematic parameter to wait have a problem. But why to produce so big mistake, did not appear to call the police accordingly again however information examines discovery further, this axis is the axis of straightforward way, when X axis is loose main shaft box is down, formed accident. Illness processing: Hold to the PLC logic of the machine tool accused a program to do amend, it is namely when X axis is loose, make X axis first can to load, loosen X axis again; And when X axis clamp, first X axis clamp hind, again make can take out. Defect of the machine tool after adjusting is able to handle. 3.

Problem of machine tool azimuth causes appearance of defect of treatment precision abnormality: The vertical CNC Milling that a Hangzhou produces, system of equipment Beijing KND-10M. In the dot is moved or machining a process, discover Z axis is abnormal. Illness diagnose: Examine discovery, next shift on Z axis are inhomogenous and have noise, and existence is sure and interstitial. When electric machinery is started, the noise that moves the motion on axial of the Z below method to exist to be not stabilized in the dot and get power inhomogenous, and sensory electric machinery is vibratile feraller; And when moving downward, did not vibrate so showing; Do not vibrate when break down, reflect so that showing quite in machining a process. Analyse think, because wool cause of disease has at 3 o'clock: It is guide screw retrorse gap is very big; 2 it is abnormality of exercise of Z axis electric machinery; 3 it is damage of leather belt annulus comes get power not all. But those who a problem wants to notice is, do not vibrate when break down, fluctuation motion is inhomogenous, electric machinery exercise is so abnormal this problem can broom. Be opposite first consequently mechanical part diagnose, abnormal without discovery in diagnose testing process, it is in public service. Use cleanup law, the rest of want leather belt issue only, detecting when leather belt, disclosure this leather belt just was changed before long, but detecting carefully when leather belt, discover leather belt inside presents the damage of different level, very be being shown is to get power all be not reached, it is what reason form discover in diagnose electric machinery is placed have a problem, the viewpoint azimuth asymmetry that holds clip namely is formed get power not all. Illness processing: As long as electric machinery reshipment, aim viewpoint, measure is very removed (the bearing of electric machinery and Z axis) , leather belt both ends (length) want even. Such, next shift on Z axis are inhomogenous and noise and vibratile phenomenon are eliminated, rehabilitation of Z axis treatment is normal. 4.

Systematic parameter was not optimized, abnormality of electric machinery movement brings about parameter of system of treatment precision abnormality to basically include unit of machine tool feed, slanted at 0 o'clock buy, retrorse space. For example system of Frank numerical control, its feed unit has metric and imperial two kinds. Repair in the machine tool handle about the part in the process, often affect slanted at 0 o'clock buy and interstitial change, the adjustment that in season answers after illness processing ends and amend; On the other hand, because mechanical wear is austere or join a change that becomes loose to form parameter actual measurement possibly also to be worth, need does machine tool of corresponding correction ability satisfaction to machine the requirement of precision to parameter. Illness phenomenon: The vertical CNC Milling that a Hangzhou produces, system of equipment Beijing KND-10M. In machining a process, discover X axis precision is abnormal. Illness diagnose: Examine discovery X axis existence is sure and interstitial, and the phenomenon with the not stable existence when electric machinery is started. With the feeling when the hand contacts X axis electric machinery electric machinery is pulled move feraller, pull when break down move showing, nod especially move method to fall to be being shown quite. Analyse think, because wool cause of disease has at 2 o'clock: It is guide screw turns over space very big; 2 it is abnormality of exercise of X axis electric machinery. Illness processing: The parameter function of use KND-10M system, undertake debugging to electric machinery. Principal undertake compensating to the space of existence, parameter of readjust servo system and pulse restrain function parameter, of X axis electric machinery vibratile eliminate, rehabilitation of precision of machine tool treatment is normal. CNC Milling CNC Machining