The Т Ф that we transform 1271 machining center are Anhui the bed of two mobile phones that factory of batholith of one steam car imported from Russia 1994, purchase valence to be 250 thousand yuan of RMBs. Because dependability of numerical control system is poor, do not use system of its numerical control to cannot work normally, cause whole machining center to break down, the birth that gives them the plant caused very big effect. And 1271 machining center are in Russia Т Ф at present what home uses is not much, without more perfect after service system. Then this factory entrusted us to undertake renovating transforming to this equipment. Ф of 1 Т 1271 machining center are the characteristic Т Ф of 1271 machining center Russia 669 time product. This machining center is electric partial performance is poorer, numerical control system is very backward, and the system is internal yuan parts of an apparatus is detached component more, systematic volume is huge, stability is poor, fault rate is high, as less than the function as the photograph of numerical control system that produces domestic and internationally at present, like communication, sheet paragraph, jump paragraph, treatment graph shows wait for a function to be done not have, bring a few inconvenience to the person that use; The component of electric machinery control that strong report part is like hydraulic pressure, cooling, lubricant, main shaft and circuitry already ageing; A few positions of machining center detect switch is belonged to nonstandard component, congener switch cannot be found to make spare parts in home. Performance of share of machinery of this machining center is good, each components wear away less, return can better land to satisfy the design requirement of the machine tool. Its mechanical design has 3 characteristics, knife library capacity is 12 knives, every locate the choice of the knife by electric control thick fixed position, locate by essence of mechanical link stopper finally; Main shaft electric machinery is three-phase asynchronous electric machinery, can work to fall in rated rotate speed only, the drive of gear clench the teeth that selects different tine number next forms 18 kinds of rotate speed; Main shaft is directional for mechanical directional, pass the control of pair of hydraulic pressure a powerful person, rely on hydraulic pressure drive, turn main shaft to the position that change a knife directly. 2 transform plan to change numerical control system, use institute of Beijing machine tool to develop CME1000 system of production. This system is system of economy numerical control, have favorable performance/price ratio, use extensively at lathe, milling machine, machining center. Compare with primary system photograph, this system volume is minor, have good man-machine interface, fixed position precision is tall, the function is strong, increased communication function, can put through continuously with the computer dispatch, go to the lavatory to was offerred from line process designing; Machine indication function of the graph, the person that can let process designing is in the machine tool does not see simulative machines a curve below behavioral circumstance, make debug a program very safe, convenient; Odd paragraph of function, try in workpiece when cutting, with sheet paragraph the function is safer; Jump paragraph of function, the agile application that is same process offerred a condition; The machine tool chains function, photograph of indication function of this function and graph cooperates to make debug treatment very convenient; The hand shakes function, when machining pair of knives, it can adjust position of point of a knife continuously, the site that uses than primary machine tool moved a function to go to the lavatory a lot of. Strong report part, performance of electric machinery itself is good, but yuan of parts of an apparatus that controls a system and wire cable ageing, give to the electric machinery of former machining center so reservation, include main shaft electric machinery, cooling electric machinery, lubricant electric machinery and hydraulic pressure electric machinery, and give entirely to other part replace. The position detects switch part, the journey switch of former machining center and be close to switch to use dispute standard component, to these detect nonstandardly switch general is replaced with homebred standard component entirely. Mechanical share performance is in good condition and overall give reservation. Transform expense entirely for 10. 50 thousand yuan of RMBs, the fare that buys former machining center is 250 thousand yuan of RMBs, buy to want 80 ～ with the machining center of coequal class after transforming 1 million yuan of RMBs. Principle of control of main shaft electric machinery pursues the 18 archives gearshift of the main shaft of choice of 18 kinds of rotate speed of main shaft of a few in transforming a process 3 special problems is to pass gear of 3 groups of slippage to come true. Gear of 3 groups of slippage dials forked control by drive of 3 hydraulic pressure respectively. In process of tine rotate archives, main shaft electric machinery undertakes the pace is entered, in order to make sure gear can be fast well and truly clench the teeth. When main shaft electric machinery takes a function without the pace, appear easily the phenomenon carrying tine on the head of gearshift process, bring about put into gear failure. Shaft coupling clearance passes shaft coupling to be linked together to the affects workbench guide screw of machine tool precision and servo electric machinery, each hold the one share of shaft coupling on guide screw and electric crankshaft, two parts photograph cooperates to realize transmission. Shaft coupling is itself of primary machine tool, shaft coupling of two parts cooperate clearance δ to be 200µm, electric machinery turns circuit workbench shift is apart from DL to be 10mm, d of shaft coupling diameter is 60mm, the error E that cooperates clearance D to cause is D=10 of π of E=d · DL/ .
The error that 6(µm) cooperates clearance to cause is 10.
6µm, the design of former machining center machines precision to be 30µm, because this shaft coupling cooperates the error that clearance causes to be inside normal limits, the shaft coupling of former machining center can continue to use. The place before pace of main shaft electric machinery is like into functional implementation is narrated, when gear of main shaft box undertakes shifting gear, need main shaft does a pace to enter cooperate, appear extremely easily otherwise shift gear failure. Electric machinery of main shaft of general three-phase asynchronous takes a function without the pace, connect to electric machinery with three-phase alternating current, electric machinery undertakes high speed rotates. Pass the control of PLC, the three-phase of electric machinery circles block to connect with inferior dc pulsatile voltage, realized pace of main shaft electric machinery to take a function. Principle as above pursues. We are opposite 4 last words Russia Т Ф of 1271 machining center in transforming a process, detect to the position from numerical control system switch and operation face plate transform place to be mixed with equipment yuan of parts of an apparatus is entire introduce a home made product. On one hand as a result of in last few years industry of homebred numerical control grows quickly, the product of certain numerical control of manufacturer of partial numerical control is OK on quality comparative with congener product of abroad; Introduce a home made product on the other hand OK and managing cost, facilitate safeguard. After this machining center is transformed, arrive to already worked one year normally continuously at present, in treatment precision and functional respect satisfy the design requirement of former machining center, and the machining center after transforming, compare with the photograph before transforming, fixed position precision is tall, what still increased order of communication function, numerical control is odd paragraph of executive function and jump paragraph of executive function and hand shake a variety of functions such as the function. Transform to the numerical control of old machine tool or machining center, can make they eliminate equipment by stale and turn advanced CNC Machining into equipment, transform charge to be equivalent to buying place of a congener new facility to need the 10 ％ of charge only, transform newlier to the numerical control of old machine tool or machining center can bring good company full benefit and economic benefits. CNC Milling
CNC Machining