Design of 360 turning center discusses φ

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Turning center is a kind of when in numerical control lathe the development in developing a process goes numerical control lathe that has compound process capability, it holds the treatment function of numerical control lathe and machining center concurrently, it is breed of a kind of when at present each main industry developed country develops eagerly very important numerical control machine tool. Its advantage is one machine multi-purpose, cover an area of an area small, managing investment, assure to machine precision, reduce workpiece to be in goods, raise treatment efficiency to wait. 360 turning of φ the center is Zhejiang province " 95 " key science and technology tackles key problem one of projects, mix by Zhejiang industry university all and machine tool factory designs development jointly. This product saves a committee of science and technology to chair held appraisal to meet by Zhejiang at was being passed on December 30, 1998, be attended the meeting the expert's accord reputably. 360 turning of φ the biggest characteristic of the center is the nicety, broad user place that is market economy condition efficient, practical, economy, easily to fall is accepted, accord with the national condition of our country. 1 design thought in last few years, as technical development, the product changes accelerate, machining course of study begins to appear much breed, in the manufacturing mode of small lot, precision and efficiency demand rise ceaselessly. Aborning of lathe of general accuracy machine tool and economy numerical control exposes the inadequacy that gives process capability gradually. We carry comprehensive market survey, the decision develops the turning machining center of a kind of nicety, efficient, practical, economy, this is φ 360 turning center. Design program decides the requirement according to technical assignment certificate really, defined design program from the following respects. The standard that develops according to current international and domestic economy technology and the supply demand relations that decide by place of market economic system, current and development and manufacturing function are not very much with the structure not quite complex turning center, because this answers to be developed above all,can accuse number of axle to be 3(namely (axis, X axis and Z axis) turning center, later can the development according to market demand, on this foundation development can control number of axle and function more turning centers. Advocate electric machinery uses the servo electric machinery that holds C axis function concurrently, with same catenary adopts a drive inside the switch that the PLC of outfit undertakes imitate signal and each other lock, realize main shaft respectively advocate motion and C axis move. This kind of plan and program of commonly used two drive catenary are different, rigid structure simplifies greatly, make more easily, cost is relatively inferior also. Use system of German SIEMENS numerical control. The X axis of the machine tool and drive of Z axis feed use system of drive of servo of half closed circuit, because closed circuit system is in theoretic drive precision is taller, but the structure is complex, adjust difficulty system of half closed circuit is in electric with rigid structure respect not be very complex, but requirement of precision of OK and contented treatment, at present most turning center uses this kind of system. Machine tool lathe bed uses the structure of lathe bed inclined slide, facilitate not only so a bits, and still have cover an area of an area small, facilitating operation, delightful the good point with be changed as good as workmanship sex. The 12 worker worker that employ German SAUTER firm tool carrier of circumgyrate type motivation. Numerical control turns tower tool carrier is implementation car, auger, the crucial part that the multitask foreword such as boring, mill machines, domestic and internationally professional factory produces this kind of part. To assure the working precision of this machine tool, shorten production cycle, although cost is a few higher, we still use the dynamical tool carrier of German SAUTER company. At present the real need of domestic user reachs the firm ground of technical parameter the development trend of foreign congener product, decide the main parameter of this machine tool is: (360mm (2) of diameter of circumgyrate of the greatest work is the biggest on 1) lathe bed rotate speed of main shaft of 80mm (4) of diameter of via of main shaft of treatment length 750mm (3) (stepless) tool carrier of 0 ～ 3500r/min (5) installs a knife to count 12 (speed of feed of 6) Z axis (stepless) speed of feed of axis of 0 ～ 20m/min (7) X (stepless.

Axis of 001mm (11) C is the smallest output increment 0.

001 degrees (12) Z to repeat fixed position precision 0.

007mm (13) X to repeat fixed position precision 0.

002mm (14) tool carrier repeats fixed position precision 0.

002mm (15) machines circularity 0.

002mm (16) over all dimension (800 × of × of H) 2000 of × of L × W 1600mm (17) machine tool is suttle one of characteristics of the main characteristic machine tool of 4800kg 2 machine tool are component of high accuracy headstock use main shaft of bearing of bearing of NSK of Japanese high grade high accuracy, bearing uses bearing of roller of biserial short cylinder and two ball bearing before, bearing also uses bearing of roller of biserial short cylinder after, make around bearing calorific and even, reduce main shaft angular displacement, the heat that reduces a machine tool is out of shape. Advocate transmission uses high speed grease to lubricate, in order to reduce the calorific amount of headstock and other bearing, prolong the life of bearing. Main shaft system passes accurate dynamic balancing, ensure vibration of component of main shaft box is small, rigid good, precision is tall. Lathe bed uses barrel type muscle to harden compose and with the bed make it an organic whole, enhanced tigidity thereby. Lathe bed slideway and use supersonic frequency to quench with circumjacent grinding craft, quench layer deepness maintains in 2.

5mm above, the precision that raised a machine tool effectively and precision maintain a gender. The output of electric machinery of servo of vertical transverse feed of the machine tool installs stretch shaft coupling and synchronous tooth form to take connection respectively after end, make transmission more smooth. Even if transverse feed all is used inside drive of circular ball guide screw, make the X of the machine tool and Z to repeat fixed position precision to be achieved respectively 0.

002mm and 0.

007mm. The unit of the smallest set of X axis and Z axis is 0.

001mm, the increment of the least output of C axis is 0.

001 degrees, turn the repetition of tower tool carrier locates precision is 0.

002mm, and numerical control system has the function such as cutting tool compensation, clearance compensation, pitch compensation, assured to machine the treatment precision of the spare parts in the round. Efficient compound treatment can have to swing tower on turning center, the car, auger, mill and attack the working procedure such as whorl to be centered at a machine tool, and the spare parts holds clip the error is small, rose to machine quality and efficiency, save facility cost, simplified to produce government. Main shaft is highest turn up 3500r/min, dynamical cutter spindle is highest turn up 2500r/min, fast feed achieves X axis and Z axis respectively 10m/min and 20m/min, and Z to from the 0 changeover time to 20m/min only 0.

06s, main shaft from the 0 changeover time to 3500r/min only 2.

5s, turn tower knife adds worn photograph adjacent to change knife time only 0.

3s, these assured those who machine efficiency to rise. System of practical strong numerical control has more complete loop function, reach whorl cutting loop circularly like cutting of linear interpolation, circular arc interpolation, taper, make machine tool process designing simple. Still can undertake man-machine interaction process designing at the same time, undertake athletic contrail and dynamic imitate, coexist have library of turning technical data. The machine tool is handy to the knife, have a variety of methods, usable cutting tool machines a spare parts directly, system of input of actual measurement value, make cutting tool slants buy value is generated automatically. The installation of cutting tool is adjusted handy and rapid. The function key on operation face plate already was defined oneself for this factory, handier and intuitionistic, control 3 claw with PLC clamp, loosen, sleeve of rear push frame is extended, knife of go back, tool carrier choosing, fixed position, dynamical cutting tool whether become effective, main shaft or C axis become effective, with the simplest operation implementation Electromechanical adjustment achieves place to need a function. Center of a turning can replace many to mix a variety of machine tools, outside the cutting treatment function that it has lathe of ordinary numerical control, use C axis and circumgyrate cutting tool to be able to undertake fore-and-aft bore, drill prejudicial hole, attack whorl, fore-and-aft mill chamfer, mill end panel, mill circle uses groove, the car carries face whorl, mill polygon, mill circle is used, mill is fore-and-aft helix chamfer, mill outline and carve characters on a seal, finished product can be achieved to change the end of treatment on a machine tool. Economy is as a result of us on overall program and structural function design, replace with simplification as far as possible complication, like control choosing of number of axle is 3, use the servo electric machinery that holds C axis function concurrently to decide electric machinery, even if transverse feed uses shaft coupling and synchronous tooth form to take drive respectively, make the machine tool appears on structural program brief way is logical, reduced cost at the same time. The cost of this machine tool is 400 thousand yuan about, price is controlled in 550 thousand yuan, and the price of congener turning center all is in domestic other 700 thousand yuan of above. 3 last word φ the development of 360 turning center is successful, supplied equipment of technology of a kind of nicety, efficient, practical, economy for course of study of our country machining, humble of Zhejiang of this product classics amounts to the user such as the group to use, pass real test to prove, the automation rate of the machine tool is high, the job is reliable, overall function already approached level of foreign congener product, reason can replace an entrance. CNC Milling