Numerical control machining process analysis

Process analysis

The NC machining problem of the machined parts involves a wide range of aspects, and the following points must be analyzed and reviewed in combination with the possibility and convenience of programming.

1, the size should be in line with the characteristics of CNC machining

In numerical control programming, the dimensions and positions of all points, lines and surfaces are based on the programming origin. Therefore, the coordinate dimensions are directly given on the part drawing, or the dimensions are quoted with the same reference as far as possible.

(2) The conditions of the geometric elements should be complete and accurate

In the process of programming, the programmer must fully grasp the parameters of the geometric elements that constitute the outline of the part and the relationship between the geometric elements. Because in the automatic programming to define all the geometric elements of the part outline, manual programming to calculate the coordinates of each node, no matter which point is not clear or uncertain, programming can not be carried out. However, due to the lack of consideration or neglect of the part designer in the design process, the parameters are often incomplete or unclear, such as the arc and the straight line, the arc and the arc are tangent or intersecting or separated. Therefore, in the review and analysis of drawings, we must be careful, find problems in time to contact the designer.

3. Reliable positioning benchmark

In CNC machining, the machining process is often more concentrated, and it is very important to locate the same benchmark. Therefore, it is often necessary to set some auxiliary reference, or add some process boss to the blank.

4, unified geometric type or size

The shape and inner cavity of the parts are of a uniform geometric type or size, which can reduce the number of tool changes, and may also apply control programs or special programs to reduce the length of the program. The shape of the parts is as symmetrical as possible, which is easy to program by using the mirror processing function of the CNC machine tool to save programming time.