CNC machining is the mainstream machining method at present. When we carry out CNC machining, we should not only know the characteristics of CNC machining, but also know the steps of CNC machining, so as to better improve the machining efficiency.
1. Analyze the processing drawings and determine the processing process
According to the processing drawings provided by the customer, the technologist can analyze the shape, dimensional accuracy, surface roughness, workpiece material, blank type and heat treatment status of the parts, and then select the machine tool and cutting tool to determine the positioning clamping device, processing method, processing sequence and cutting amount. In the process of determining the machining process, we should fully consider the command function of the NC machine tool used, give full play to the efficiency of the machine tool, and achieve reasonable machining route, less tool walking times and shorter machining hours.
2. Reasonably calculate the coordinate value of the tool path
According to the geometric dimensions of the machined parts and the set programming coordinate system, the motion trajectory of the center of the tool path is calculated, and all tool position data are obtained. General CNC system has the functions of linear interpolation and circular interpolation. For the contour processing of plane parts with relatively simple shape (such as parts composed of lines and circular arcs), it only needs to calculate the starting point and end point of geometric elements, the center of the arc (or the radius of the arc), and the coordinate value of the intersection or tangent point of the two geometric elements. If the NC 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 surfaces), it is necessary to use straight-line segments (or arc segments) to approximate the actual curves or surfaces, and calculate the coordinate values of their nodes according to the required machining accuracy.
3. Compile CNC processing program of parts
According to the tool path of the part, the tool path data and the determined process parameters and auxiliary actions are calculated. Programmers can write the processing program of the part segment by segment according to the functional instructions and program segment format specified by the NC system used. Attention should be paid to: first, the standardization of program writing should be easy to express and communicate; Second, on the basis of being fully familiar with the performance and instructions of the NC machine tool used, the skills of using each instruction and programming segments.
(Editor: we are Shenzhen perfect precision products Co., Ltd., specializing in providing laser cutting, bending, stamping, spinning, welding and other high-quality sheet metal processing services. With 15 years of experience and a 3000 square meter factory, we have an experienced engineering team, with iso9001:2015 quality system and imported machines from the United States and Japan. You can send us inquiries below.)