Some knowledge of CNC machining

Some knowledge of CNC machining

Numerical control is a process that uses specialized computers to represent operation instructions in numerical form, and machine equipment stops executing tasks in a predetermined order. Numerical control machining refers to a process method of stopping machining parts on a numerical control machine tool. Overall, the process rules of numerical control machine tools and traditional machine tools are different, but there are also significant changes. The mechanical processing method of using digital information to control the displacement of parts and tools is an effective way to handle parts with multiple varieties, small batches, complex shapes, and low precision requirements. It is also an effective way to automate machining.

CNC machining is a type of machine tool controlled by a computer, used to control the computer of the machine tool, whether it is a public computer or a general-purpose computer, collectively referred to as the CNC system. The motion and assistance of a CNC machine tool are controlled by instructions extracted by the CNC system. The instructions of the CNC system are written by programmers based on the material of the workpiece, processing requirements, characteristics of the machine tool, and conventional instruction formats (CNC characters or symbols). The CNC system controls the various movements of the machine tool by retrieving operation or termination information from servo devices and other functional components based on sequential instructions. When the machining sequence of parts is completed, the machine tool will automatically stop.

What is the reason for the unstable size of CNC machining centers?

In the process of using machine tools in CNC machining centers, when the machine tool is used for a certain period of time, there may be some problems with the size of the machine tool. So what are the reasons for these problems?

How can these faults be eliminated to reduce the frequency of after-sales repairs?

Next, let's analyze the mechanical reasons;

1. The excessive movement resistance of the machine tool workbench (or tool holder) in the machining center is generally caused by tight chip adjustment and poor lubrication of the machine tool guide rail surface. This fault phenomenon is generally manifested as irregular changes in the size of the parts in a few threads. Simply readjust the cutting and improve the lubrication of the guide rail.

2. Poor lubrication between the ball screw and nut of the machine tool increases the motion resistance of the workbench (or tool holder), making it unable to fully and accurately execute motion instructions. This type of fault usually manifests as irregular changes in the size of parts in several wires, and only by improving lubrication can the fault be eliminated.

3. The wear or improper adjustment of the rolling bearings of the machine tool leads to excessive motion resistance. This fault phenomenon is usually manifested as irregular changes in the size of the machining center in several lines. As long as the worn bearings are replaced and carefully adjusted, the fault can be eliminated.

4. By adjusting the gap or changing the gap compensation value, inappropriate screw gaps or gap compensation can be eliminated.

Precision machining