1、宁夏大学机械工程学院 2011 届毕业设计 65 NUMERICAL CONTROL Numerical control is a form of programmable automation in which the processing equipment is controlled by means of numbers， letters， and other symbols The numbers， letters， and symbols are coded in an appropriate format to define a program of instructions f
2、or a particular work part or job When the job changes， the program of instructions is changed The capability to change the program is what makes N C suitable for low-and medium-volume production It is much easier to write programs than to make major alterations of the processing equipment Number con
3、trol lather main use to carry on a car to pare towards revolving body spare parts, the Tang pare, drill to pare, the Jiao pare, offend silk etc. process of work preface. General ability auto inside completion outside cylinder noodles, conic surface, surface of sphere, cylinder thread, slot and carry
4、 noodles etc. the slice of work preface pare to process. The host is the topic that the number control lather and include a tool machine body, sign pillar, principal axis and enter etc. is to the organization machine parts. Number control equip, is number control tool machine of core, include hardwa
5、re and correspond of software, used for an importation numeral turn of spare parts procedure, and completion importation information of saving, the transformation of data, put to repair operation and realization various control function. Drive to equip, he is number control the drive of organization
6、 of the tool machine performance parts, include a principal axis to drive unit and enter to the unit, principal axis electrical engineering and enter etc. to electrical engineering. He under the control that number control to equip pass electricity or electricity liquid servo system realization prin
7、cipal axis with enters give drive. When several enter to give allied move, can 宁夏大学机械工程学院 2011 届毕业设计 66 completion fixed position, straight line, process of flat surface curve and space curve. Assistance equips the index number control tool machine of some necessity of kit parts, in order to assuran
8、ce number control tool machine of circulate, such as cool off, row scraps, lubricate, illuminate, monitor etc. It include a liquid to press friendly move equip, row scraps equip, exchange work set, number control to turn Taiwan and number control cent degree head. Plait distance and other subsidiary
9、 equipments, can use to carry on the procedure of spare parts to draw up outside machine, saving. Modern number control lather to all have X, Z two stalk of allied move function, knife position and point of a knife arc radius of compensate function, and process fix circulation function. The number c
10、ontrol the structure of lather 1. The number control a lather brief introduction The number control constitute of lather: Number control system, bed body, principal axis and enter to the system, turn round a knife, operation front-panel and assistance system etc. (1) The economy number control lathe
11、r: Adoption step enter electric motor and list slice machine to common the car of the lather pare into to the system carry on reformation behind formation of the simple number control lather. The cost is lower, automation degree and function be all more bad, the car pare to process accuracy also not
12、 high, be applicable to request not high of turn round type spare parts of the car pare to process. The economy number control lather (2) Common number control lather: Pare to process a request to carry on the structure according to the car specialized design, equipment in general use number control
13、 system but formation of number control lather. Number control system function strong, automation degree with process 宁夏大学机械工程学院 2011 届毕业设计 67 accuracy also more Ago, be applicable to general turn round type spare parts of the car pare to process. This kind of number control lather can control 2 sit
14、 a mark stalk in the meantime, namely x stalk and z stalk. Common number control lather (3)the turning center: At common number control the foundation of lather up, increment C stalk and motive head, more high class of the tool machine still take a knife database, can control X, Z and C 3 sit mark s
15、talk, allied move control stalk can BE(X, Z),(X, C) or(Z, C).Because increment C stalk and Xian pare a motive head, this kind of number control process of lather function consumedly strengthen, in addition to carry on general the car pare, also can carry on path to pare with stalk toward the Xian, t
16、he curved face Xian pare, the center line dont turn round in the spare parts center of bore and path pare toward the drill of bore etc. process. 2. The liquid press card dish and liquid to press a tail The liquid press card dish is number control a car to pare to process clip tight work piece of imp
17、ortance enclosure, rightness general turn round type spare parts can adoption common the liquid press card dish； To the spare parts be clip hold the part isnt the spare parts of cylinder form, demand adoption appropriation card dish； With the stick anticipate direct process spare parts demand adopti
18、on spring coil card dish. To stalk to the size and the path is to the specific value bigger spare parts of size, demand adoption install press a tail in the liquid up of live top carry on prop up to the spare parts end tip, then can assurance carry on to the spare parts exactitude of process. The tail has a common liquid to press tail and programmable liquid to press a tail. 3. The number control the knife of lather Number control lather can equipment two kinds of knife: (1) Appropriation knife from lather produce manufacturer oneself
