What are the main contents of CNC machining process analysis

CNC machining refers to the machining process in which the control system issues instructions to make the cutting tool perform various movements that meet the requirements, representing the technical requirements and processing process requirements of the workpiece shape and size in the form of numbers and letters. It generally refers to the process of machining parts on CNC machine tools.

The CNC machining process of the processed parts involves a wide range of issues. Below, based on the possibility and convenience of programming, some main contents that must be analyzed and reviewed are proposed.

1. Dimensional annotation should comply with the characteristics of CNC machining
In CNC programming, all dimensions and positions of points, lines, and surfaces are based on the programming origin. Therefore, it is best to directly provide coordinate dimensions on the part drawing, or try to use the same benchmark to annotate dimensions.

2. The conditions of geometric elements should be complete and accurate
In programming, programmers must fully grasp the geometric element parameters that make up the contour of the part and the relationships between each geometric element. Because all geometric elements of the part contour need to be defined during automatic programming, and the coordinates of each node need to be calculated during manual programming. Regardless of which point is unclear or uncertain, programming cannot proceed. However, due to inadequate or overlooked consideration by part designers during the design process, incomplete or unclear parameters often occur, such as whether the arc is tangent, intersecting, or apart from the line or arc. So when reviewing and analyzing drawings, it is important to be careful and promptly contact the design personnel if any problems are found.

3. Reliable positioning reference
In CNC machining, the processing steps are often concentrated, and positioning with the same benchmark is very important. Therefore, it is often necessary to set some auxiliary benchmarks or add some process bosses on the blank.

4. Unified geometric type or size
It is best to use a unified geometric type or size for the appearance and inner cavity of the parts, which can reduce the number of tool changes. It is also possible to apply control programs or specialized programs to shorten the program length. The shape of the parts should be as symmetrical as possible to facilitate programming using the mirror oriented machining function of CNC machine tools, in order to save programming time.