Traditional process division

What is the content and purpose of NC machining stage division, and what are the principles and methods of machining process division? A: Division of work procedures.

1. This process is divided by the clamping and positioning of parts. Because of the different structural shapes of each part, the technical requirements of each surface are different, and the positioning method is also different during processing. Generally, when machining the shape of parts, the internal shape is positioned; When machining the internal shape of a part, it is located by the external shape, and the working procedures can be divided according to different positioning methods.

2. Machining is divided into rough machining and finish machining: when machining processes are divided according to the machining accuracy, stiffness and deformation of parts, the division of processes can be carried out according to the principle of separating rough machining from finish machining, that is, rough machining is carried out first and then finish machining. At this time, different machine tools or different tools can be used for processing. Usually, in one installation, other surfaces of parts are not allowed.

In order to reduce the number of tool changes, shorten idling time and reduce unnecessary positioning errors, we can use the same tool to process all the machinable parts, and then use another tool to process other parts of the parts. This method is often used in special CNC machine tools and machining centers.

Division of work steps:

The division of working procedures is mainly not considered from two aspects: machining accuracy and productivity. In a process, it is often necessary to use different cutting tools and cutting parameters to process different surfaces. In order to facilitate the analysis and description of complex parts, the process is subdivided into several steps.

The principle of step division is:

1, the same surface should be roughed, semi-finished and finished in turn, or all the machined surfaces should be machined separately after roughing and finishing.

2. For parts with both milling plane and boring surface, the milling plane before boring can be used for machining, because this division of work steps can improve the machining accuracy of holes. Because the cutting force is large when milling the plane, the parts are easy to deform. Milling the plane before boring can restore its deformation in a period of time and reduce the influence of this deformation on the hole accuracy.

3. Divide the steps according to the tools used. The rotation time of some machine tool tables is shorter than that of tool changing, so the working steps can be divided according to the tools used to reduce the number of tool changing and improve the machining efficiency.