CNCPartProgramming.pdfVIP

Lecture 6 CNC Part Programming ( 数控编程技术 ) Dr. Xujing Yang, Professor College of Mechanical and Vehicle Engineering Hunan University Hunan University. P. R. China Xujing Yang CAM APPLICATIONS Hunan University. P. R. China Xujing Yang Main Content for Programming ? NC Code Description and Format ? Preparatory function （G-function） Codes ? Miscellaneous function（M-function） Codes ? Canned Cycles ? Advanced Curve Interpolation Hunan University. P. R. China Xujing Yang An NC Program % O9001 N1 G17 S630 T1 M6 N2 G54 N3 G0 X60 Y30 Z-8 M3 N4 G1 Z-10 F50 N5 G43 X80 F100 G6 G42 … M30 % This NC program is to planar profile. Hunan University. P. R. China Xujing Yang Memory Identifier and Program Number ? Main program: O**** （主程序） ? Subprogram: O**** （子程序） ? A CNC program always begins with N and a number. This number serves as the program identification number. 程 序 一 般 以 行 号 开 始 N××××，行号主要用来作为鉴别和跳转语句用 For example: N1 to N9999 Hunan University. P. R. China Xujing Yang Addresses and Numbers ? Addresses （地址） – Certain alphabetical characters are used as addresses. ? Numbers （数字） – Either integer or real number. – In metric system, three digits in the decimal part. – In English system, four digits in the decimal part. ? Input formats for axis address （轴地址输入格式） – Metric 6.3 X123456.789 – Inch 5.4 X12345.6789 Hunan University. P. R. China Xujing Yang Words ? Words with block-wise validity （无模式字） These commands remain valid only for the block where they have been programmed. Example: G04 P1000; A word consists of an address, sign, and a number. Each word represents a command or a value （由地址、符 号和数字组成） Each address can only be used once in a block. eg. G00 X100.05. Hunan University. P. R. China Xujing Yang Words ? Words with modal validity （有模式字） – The command remains valid for the following blocks. – The validity of this type of command can only be superimposed or terminated by another command or word belonging to the same group. Example: G01 X_ Y_ Z_ ; X_ Y_ Z_ ; Hun