According to the processing drawings provided by the customer, the technicians can analyze the shape, dimensional accuracy, surface roughness, workpiece material, blank type and heat treatment conditions of the parts, and then select the machine tool and tool, determine the positioning and clamping device, processing method, processing The order and the size of the cutting amount. In the process of determining the machining process, the command function of the CNC machine tool used should be fully considered, the efficiency of the machine tool should be fully utilized, and the processing route should be reasonable, the number of tool passes should be less, and the processing time should be short.

 

According to the geometric size of the machined part and the programmed coordinate system, the movement path of the tool path center is calculated, and all the tool position data are obtained. The general CNC system has the functions of linear interpolation and circular interpolation. For the contour processing of planar parts with relatively simple shapes (such as parts composed of straight lines and circular arcs), it is only necessary to calculate the starting point, end point and circular arc of geometric elements. The center of the circle (or the radius of the arc), the coordinate value of the intersection or tangent point of two geometric elements. If the CNC system has no tool compensation function, the coordinate value of the motion path of the tool center should be calculated. For parts with complex shapes (such as parts composed of non-circular curves and curved surfaces), it is necessary to use straight line segments (or arc segments) to approximate the actual curve or surface, and calculate the coordinate values ​​of its nodes according to the required machining accuracy.

 

According to the tool path of the part, the tool movement path data and the determined process parameters and auxiliary actions are calculated. The programmer can write the part's machining program segment by segment according to the functional instructions and program segment format specified by the CNC system used. When writing, attention should be paid to: first, the standardization of program writing, which should be easy to express and communicate; second, on the basis of being fully familiar with the performance and instructions of the CNC machine tools used, the skills used for each instruction and the skills of program segment writing.