Content and steps of CNC lathe

The main content of CNC machine tool programming
Analyze part drawings, determine machining processes, perform mathematical processing, write program lists, create control media, perform program checks, input programs, and perform workpiece cutting trials.
Steps for CNC machine tools
Analyze the part drawings and process processing, analyze the geometric shape, dimensions, and technical requirements of the parts based on the drawings, clarify the processing content and requirements, determine the processing plan, determine the processing sequence, design fixtures, select tools, determine a reasonable cutting route, and select reasonable cutting amounts.
At the same time, it is necessary to leverage the functions of the CNC system and the capabilities of the CNC machine tool itself, select the correct tool alignment point and cutting method, and minimize auxiliary time such as tool change and indexing.
Mathematical processing
Before programming, establish a workpiece coordinate system based on the geometric features of the part,
The function of the CNC system is to develop a machining route based on the requirements of the part drawing. On the established workpiece coordinate system, the motion trajectory of the tool is first calculated. For parts with relatively simple shapes (such as those composed of lines and arcs), only the coordinate values of the starting and ending points of geometric elements, the center of the arc, and the intersection or tangent points of two geometric elements need to be calculated.
Write a parts program list
After determining the processing route and process parameters, write a part program list according to the designated code and program segment format specified by the CNC system.
Structure of CNC machining program
1. Program composition: composed of multiple program segments.
O0001; O (FANUC-O, AB8400-P, SINUMERIK8M -%) can specify program numbers, with each program number corresponding to a machined part.
N010 G92 X0 Y0; A semicolon indicates the end of a program segment
N020 G90 G00 X50 Y60;
; Subprograms can be called.
N150 M05;
N160 M02;
2. Program segment format:
① Word address format: such as N020 G90 G00 X50 Y60;
The most commonly used format is adopted by modern CNC machine tools. Address N is the program segment number, address G and the number 90 form the word address for the preparation function.
② Variable program segment format: such as B2000 B3000 B B6000;
Use the separator B to separate each word. If there is no data, the separator cannot be omitted. Commonly used in CNC wire cutting machines, there are also formats such as 3B programming.
③ Fixed sequence program segment format: such as 00701+0;
The robot controlled by Siemens system is incorrect. The meaning of the above program segment is: N007 G01 X+02500 Y-13400 F15 S30 M02;