ComputerAided Manufacturing CAM 1 Automatic Machines Automatic machines

컴퓨터 지원 제조 (Computer-Aided Manufacturing ; CAM) 컴퓨터지원제조 1

대표적인 대량생산용 자동기계 Automatic Machines – Automatic machines are mechanized to produce components continually without needing any manual operation, except for initial setup, replacement of worn tools and, possibly, loading of bar stocks or workpieces(대표적인 보기 : 자동선반). Copying Machine Tools 전용공작기계(Special-purpose machine tools) – To produce large quantities of specific identical components with high productivity through fixed instructions. 트랜스퍼 머신(Transfer machines) – A series of machining heads(예: milling, boring, drilling, reaming등 ) are allocated as workstations according to the process route for the component. 컴퓨터지원제조 3

수치제어의 기초 NC is a form of programmable automation in which the processing equipment is controlled by means of numbers, letters, and other symbols [NC part program] 컴퓨터지원제조 4

NC시스템의 형식 Point-to-point NC(positioning system) Straight-cut NC 컴퓨터지원제조 Contouring NC 5

NC가공의 이점 • adaptability to production of a variety of products; • easy machining of parts with complicated forms; • increase in accuracy; • high-productive efficiency even by unskilled workers; • decrease in manufacturing lead times; • decrease in work-in-process inventories; • accurate calculation of production cost, etc. 컴퓨터지원제조 6

Conventional NC/Computer Numerical Control(CNC) machines with a single-purpose operation Numerical information as to machining operation is provided by a punched tape (conventional NC), or in a control computer with a database storing machine tools (CNC) < General configuration of a computer numerical control(CNC) system > 컴퓨터지원제조 7

Machining Centers (MC) MC automatically performs complicated multiple operations on all faces of a workpiece except the base at one setup, with several axes of control on a milling-type machine and with several dozen cutting tools held in a magazine, selected, mounted on the main spindle, and exchanged automatically by the automatic tool changer (ATC) 컴퓨터지원제조 8

DNC(Direct Numerical Control) The combination of several single [C]NC machines under the control of a [mini]computer is called direct (or distributed) numerical control (DNC), wherein CNC machine tools, industrial robots, transfer equipment, inspection devices, assembly machines, automatic warehousing facilities, etc. are operated through machine control units (MCU), on an on-line, real-time, and time-sharing basis. < General configuration of a direct numerical control (DNC) system > 컴퓨터지원제조 9

Advantages/Disadvantages of DNC Systems 1) Expansion of the manufacturing system is possible. 2) Part programming is made with ease. 3) All necessary numerical information can be stored in memory, and used at any time if desired. 4) Production information concerning production volume and progress in the workshop, production time and cost, tool life, etc. , are easily collected. 5) The number of operators is reduced, and even unskilled workers can operate easily. 6) Practical work based upon the predetermined schedule is possible with an increase in productive efficiency 컴퓨터지원제조 10