Trouble removal of CNC Machining center reachs example

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Oneself are united in wedlock to reach experience in the maintenance method of numerical control machine tool below, have a few representative breakdown case, the introduction offers reference to everybody. The JCS-018 vertical machining center that my company has institute of machine tool of two Taipei Beijing to produce, its system is to use machine tool of numerical control of complete function of Japanese FANVC-BESk7M system, 7M system uses 16 microprocessor control, servo driving unit is electric machinery of servo of big inertia dc, advocate electric machinery does not have circumfluent circuit drive by silicon controlled rectifier of three-phase complete wave, rotate transformer regards the position as detecting element, measure fast dynamo compose feedbacks into speed, this machine tool ever happened for many times in move unusual call the police and unusual appearance, we call the police according to what CRT shows answer date removes trouble quickly, those who assured a machine tool is normal move. Exemple 1: Breakdown phenomenon, CRT shows 07 ＃ of 05 ＃ call the police breakdown examination and analysis: Check FANVC-BESK7M system to maintain manual, 05 ＃ put through for urgent shutdown alarm, 07 ＃ fasten speed to control unit to call the police, look from inside maintaining manual, 05 ＃ call the police is by urgent jockey cause, it is relatively easy that reason removes its trouble, if stop switch urgently to whether be pressed, each axis of X, Y, Z exceeds Cheng spacing to whether be pressed close, check all normal, press cleared key, 05 ＃ disappear, 07 ＃ call the police to still exist, raise a hand 05 ＃ show again. Through the analysis, thinking 07 ＃ call the police is crucial, by after it is unusual, and use urgent jockey will try to protect, appear at the same time thereby 05 ＃ , 07 ＃ call the police. Call the police to 07 ＃ , maintenance manual middle finger goes out: The speed control unit of one axis is in random call the police condition, or the contactor of electric machinery power supply cord opens circuit. Generation should call the police, can consider the following matter: Overload of ① electric machinery. Overheat of transformer of power source of ② speed pilot. ③ speed controls the power source fuse of power source transformer to break. ④ speed controls unit fuse to break. ⑤ inputs bracket to go up in control part power source, the ZMGIN of junction block and the contact open a way between 2 o'clock. ⑥ inputs bracket to go up in control part power source, communication 100V fuse (F5) break. ⑦ joins speed controls the signal cable between unit and control part to disconnect, perhaps fall off from inside plug. ⑧ calls the police as a result of orgnaization of servo of some kind of other, contactor of on-line of electric Electromechanical source (MCC) disconnect. Analysis: Examination of one by one, first easy hind difficult. A: Examine hot cell with the watch yuan unusual, after and be opening NC, x axis, Y axis, Z axis, knife library each axis did not move and produce 05 ＃ , 07 ＃ to call the police, reason A deny. B: Feel transformer with the hand, hot nevertheless, it is normal to check OH1, OH2 with avometer, examine the insurance in C, D, F, did not break. E: The ZMGIN that checks wiring attune with avometer and the 2 contact between, the result is connected, normal. Reason contradiction is centered on G, H, hold back an examination with avometer report, discover Y axis speed controls unit board to have unusual. Because electric machinery has one overheat protection, here each axis is strung together together each other in electric wiring, and due 24V voltage. Its process is protected for overheat of axis of 24V → X often shut → speed to control protection of overheat of axis of unit → Y to often shut → speed to control protection of overheat of axis of unit → Z to often shut control of speed of → Z axis to control protection of overheat of unit → tool carrier to often shut speed of → knife library to control unit → , when to Y when the examination overheat protects the axis to often shut speed of → Y axis to control protection of overheat of axis of unit → Z to often be shut, be illogical, open circuit, reason checks control plate of Y axis speed, search by the line, discover club of one short circuit opens circuit, fat too dirty cause, after cleaning, insert on, it is normal to switch on the mobile phone. Exemple 2, breakdown phenomenon, main shaft cannot directional, load conveys red area 08 ＃ call the police. Breakdown examination and analysis: Check a machine tool to maintain manual, 08 ＃ call the police to locate for main shaft breakdown, according to manual requirement, we open ark of machine tool power source, in communication main shaft controls circuit board to go up, find 7 glow diode (6 green 1 red) , these 7 indicator light (from left to right) state peak value of track of low gear ③ of ② of ① directional instruction detects respectively means of experiment of the ⑤ of fixed position of ③ of fixed position of essence of ⑤ of ④ decelerate instruction that finish (one ③ is ① green, ① is red) when the machine tool is directional, the condition that observes lamp of these 7 instructions is as follows, 1 ＃ light is bright, bright of lamp of 3 ＃ , 5 ＃ , this shows fixed position instruction has been given out, track peak value already detected, fixed position signal detects, but the system cannot finish fixed position, main shaft still moves in low speed, reason light of 3 ＃ , 5 ＃ is perpetual bright, from above circumstance analysis, we suspect is the amplifier problem on main shaft box, open main shaft shield, when the examination puts Great Harmony, tube circles the oil cylinder of cutting tool clamp that discovers main shaft to go up to wring form, twine go up in main shaft, analyse this abnormal phenomenon, we are judged even if this tube is voluminous, cause deflection of main shaft fixed position and cannot locate truly definitely, cause D8 ＃ to call the police, this relatively tubal debus is answered straight hind outfit is good, the adjustment in main shaft controller potentiometer RV11 (fixed position nods deflection) undertook modulatory afresh, trouble removal, call the police disappear, machine return to normal move. Exemple 3, breakdown phenomenon: Open power source, each axis answers power source opening NC 0 hind, when the axis advocate when executive M03 starts, produce 01 ＃ to call the police breakdown examination and analysis: Check maintenance manual. 01 ＃ call the police to fasten the breakdown inside all for main shaft, can indicate content by the indicator light inside device of main shaft servo. The indicator light inside device of servo of examination communication main shaft is 4 8421 medium lamps to shine, content of 4 lamps bright directive is fusing of the F1 that communicates coupling circuit, F2, F3, and 4 breakdown are divided again for the following impedance of alternating current source is exorbitant component of diode of ③ of burn down of ② power transistor or silicon controlled rectifier is burned-out ④ surge is absorbed implement damage with capacitance. Analyse ordinal examination accordingly each, be sure only two-phase, other does not have a problem, reason changes safe, open machine tool mains switch, it is normal to measure alternating voltage, open NC power source, normal operation, when the program carries out M03, main shaft just started, produce 01 ＃ to call the police again, check F1, F2, F3 is broken again former two-phase, reason integration analysis, fling the content that maintains manual clew, detect periphery, should detect when bus discharges the box that distribute a line, discovery among them one look line is broken, because this breakdown phenomenon is other two-phase, repair divides line case, switch on the mobile phone be about power source, when executive M03 normal, breakdown is solved. Exemple 4, breakdown phenomenon: Normal treatment executes an order, when carrying out M06 of the movement that change a knife, below broach shell, main shaft is not directional, do not change a knife, main shaft presses the program of a knife continues to machine again, without call the police. Breakdown examination and analysis: Carry out order of movement of M06 of the instruction that change a knife to be, main shaft is directional, below broach shell, 75 degrees turn piece, below the arm, 180 degrees of circumgyrate change a knife, on the arm, 75 degrees turn time, on broach shell, restoration of 180 degrees of oil cylinder, give out FIN to dictate after that, carry out again issue paragraph of order. Combine breakdown analysis, examination PC is outputted board, carry out yuan of parts of an apparatus of the movement that change a knife, when checking G3, discovery is unusual. Normal when, when G3 is changing a knife, its provide part 2 for tall n, 3 for tall n, 24V does not send, and carry out the movement that change a knife, after changing a knife to end, tubal horn 2 turn into low n, and make 24V voltage sends, give out FIN, namely MT signal is carried out end, tubal horn 2 now no matter be tall n or low n, FN signal is given out, all have 24V output, MT signal is carried out end send, thereby NC is carried out issue paragraph of order. Its cutting tool had be notted exchange, easy happening bump likelihood. Accordingly, we tear open chip issueing G3, its are dry spring electric equipment, go the market buys this chip, did not buy. We use the DSZY-S-DC5C below the pine according to its function to replace, breakdown is solved, from change not was in one many year up to now produce similar breakdown, assured the normal production of the workshop. Afore-mentioned numerical control machine tools are electric breakdown example, we choose to come out with summary in maintaining example, it mirrorred numerical control machine tool electric medium a few problems, should raise numerical control machine tool electric maintenance skill, the key depends on must be familiar with place to write characteristic of function of numerical control machine tool and working principle, the CRT that if check numerical control machine tool,masters accurate method calls the police, indication content, check maintenance manual. When occurrence breakdown, according to its breakdown phenomenon, check electric manual to remove trouble, carry out ceaselessly in maintaining a course, fumble ceaselessly and accumulate experience, achieve thereby use maintenance technology neatly, eliminate numerical control machine tool the purpose of electric breakdown, produce the utilization rate of numerical control machine tool adequately, achieve beneficial result more. CNC Milling CNC Machining