數(shù)控技術(shù)概述-文庫吧
2024-12-22 01:54 本頁面
【正文】 統(tǒng) ) It is the equipment which can realize the numerical control. . Chapter 1 INTRODUCTION TO NUMERICAL CONTROL Concept of NC and CNC CNC(Computer Numerical Control, 計算機數(shù)控 ) The machine control units are based on puter technology. . Chapter 1 INTRODUCTION TO NUMERICAL CONTROL Basic Components of NC Machine Tools The control system of a numerically controlled machine tool can handle many tasks monly done by the operator of a conventional machine. The system has the ability to perform the control functions through the numerical input information, which is the control program, also called the part program. . Chapter 1 INTRODUCTION TO NUMERICAL CONTROL Basic Components of NC Machine Tools The work process of NC is shown as the right figure. Part drawing Part program Control puter Servodrive unit Machine tool Part Firstly, the part programmer should study the part drawing and the process chart. . Chapter 1 INTRODUCTION TO NUMERICAL CONTROL Basic Components of NC Machine Tools The work process of NC is shown in the right figure. Part drawing Part program Control puter Servodrive unit Machine tool Part Then the part programmer should prepare the control program on a standard form in the specified format. It contains all the necessary control information . Chapter 1 INTRODUCTION TO NUMERICAL CONTROL Basic Components of NC Machine Tools The work process of NC is shown in the right figure. Part drawing Part program Control puter Servodrive unit Machine tool Part Next the part program is transferred into the control puter(MDI).the puter converts each mand into the signal that the servodrive unit needs . Chapter 1 INTRODUCTION TO NUMERICAL CONTROL Basic Components of NC Machine Tools The work process of NC is shown in the right figure. Part drawing Part program Control puter Servodrive unit Machine tool Part At last , the servodrive unit drives the machine tool to manufacture the finished part . Chapter 1 INTRODUCTION TO NUMERICAL CONTROL Basic Components of NC Machine Tools A typical NC machine tool has five fundamental units: (1)the input media。 (2)the machine control unit。 (3)the servodrive unit。 (4)the feedback transducer。 (5)the mechanical machine tool unit . Chapter 1 INTRODUCTION TO NUMERICAL CONTROL Basic Components of NC Machine Tools The general relationship among the five ponents is illustrated in the below. . Chapter 1 INTRODUCTION TO NUMERICAL CONTROL Basic Components of NC Machine Tools The input media contains the program of instructions, it is the detailed stepbystep mands that direct the actions of the machine tool。 the program of instructions is called a part program. . Chapter 1 INTRODUCTION TO NUMERICAL CONTROL Basic Components of NC Machine Tools The program is coded on a suitable medium for submission to the machine control unit. The mon medium in the past is punched tape, magic tape: . Chapter 1 INTRODUCTION TO NUMERICAL CONTROL Basic Components of NC Machine Tools Now, The mon medium is diskette, electronic transfer from a puter(RS232C): . Chapter 1 INTRODUCTION TO NUMERICAL CONTROL Basic Components of NC Machine Tools MCU consists of a microputer and related control hardware that stores the program of instructions and executes it by converting each mand into mechanical actions of machine tool, one mand at a MCU includes system software,calculation algorithm,and transition software to covert the NC parts program into a usable format for the MCU . Chapter 1 INTRODUCTION TO NUMERICAL CONTROL Basic Components of NC Machine Tools Spindle and feed drive motor
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