There are many obvious abnormal phenomena in the turning-milling composite numerical control lathe, but in some economical numerical control systems, there is no alarm. Even if there is an alarm sometimes, the alarm message also indicates that it is not an alarm for the abnormal phenomenon that you have seen. Machine crawling and vibration is an obvious example. When the CNC machine tool is running at low speed, the machine tool table crawls forward; when the machine tool is running at high speed, it will vibrate.

Generally speaking, there are two types of vibration: 1. Forced vibration; 2. Self-excited vibration.

In CNC lathes, milling machines and grinding machines, forced vibration of the spindle system is common. Its frequency depends on the speed of the spindle system (in milling, it is also related to the number of teeth of the milling cutter). There are many forms of self-excited vibration on machine tools, such as torsional or bending self-excited vibration of rotating spindle (or connected with workpiece or tool); bending or torsional self-excited vibration of support parts such as bed, column, beam, etc.; and work The loose friction self-excited vibration of moving parts such as stage at low speed (commonly known as creeping). In the metal cutting process, self-excited vibration usually manifests as a strong relative vibration between the tool and the workpiece, which is called chatter.

The influence of CNC lathe vibration on parts is as follows

Numerical control lathes often vibrate during work. The vibration of the CNC lathe not only distorts the geometry and size of the workpiece, but also leaves vibration marks on the machining surface, which reduces the machining accuracy and surface finish, enhances the hardness of the metal surface, and reduces the durability of the tool when it vibrates. The problem is particularly serious for brittle cemented carbide tools and ceramic tools. After the machine tool vibrates, the operator is often forced to reduce the amount of cutting, thereby limiting the productivity of the machine tool. In addition, on the automatic production line of machine tools, as long as the machine tool is forced to stop running due to vibration, it will disrupt the production rhythm and cause confusion in the production process. It can be seen that the vibration of the machine tool is an important issue that must be paid attention to.

With the rapid development of science and technology, higher requirements are put forward for the manufacturing accuracy and surface quality of machine tool parts, making the research of machine tool vibration a major issue that must be faced by the machine tool research, production and use departments. In order to develop anti-vibration Better performance machine tools.