CNC machining is currently the mainstream machining method. When we perform CNC machining, we must not only know the characteristics of CNC machining, but also know the steps of CNC machining, so as to better improve machining efficiency, then CNC machining What are the processing steps?
1. Analyze the processing drawings and determine the processing process
Technologists can analyze the shape, dimensional accuracy, surface roughness, workpiece material, blank type and heat treatment status of the part according to the processing drawings provided by the customer, and then select the machine tool and tool to determine the positioning and clamping device, processing method, and 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 to give full play to the efficiency of the machine tool, so that the processing route is reasonable, the number of tools is small, and the processing time is short.
2. Reasonably calculate the coordinate value of the tool path
According to the geometric dimensions of the machined parts and the programmed coordinate system, the movement track of the center of the tool path is calculated to obtain all tool position data. General numerical control systems have the functions of linear interpolation and circular interpolation. For contour processing of relatively simple planar parts (such as parts composed of straight lines and circular arcs), only the starting point, end point and arc of geometric elements need to be calculated. The coordinate value of the center of the circle (or the radius of the arc), 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 must be calculated. For parts with complex shapes (such as parts composed of non-circular curves and curved surfaces), it is necessary to approximate the actual curve or curved surface with a straight line segment (or arc segment), and calculate the coordinate value of its node according to the required machining accuracy.
3. Write parts CNC machining program
According to the tool path of the part, the tool motion trajectory data and the determined process parameters and auxiliary actions are calculated. The programmer can write the part processing program section by section according to the function instructions and block format specified by the numerical control system used.
Note when writing:
First, the standardization of program writing should be easy to express and communicate;
Second, on the basis of fully familiar with the performance and instructions of the CNC machine tool used, the skills used for each instruction and the skills of program segment writing.
Post time: Nov-12-2021