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Second hand machine tools are commonly used machinery and equipment. But if a malfunction occurs, how should we solve it. Today, the editor will take the 1690 vertical machining center as an example to provide a detailed analysis of its fault causes, hoping to help everyone.

Vibration is a major headache for many operators. Vibration not only seriously reduces the quality of the machining surface, but also shortens the service life of the machining center and tools. To solve this problem, we should first identify the main cause of the malfunction.

Forced vibration

This is caused by external periodic interference forces, such as the imbalance of rotating components on the 1690 vertical machining center machine. The centrifugal force generated after rotation stimulates the system, and external vibration is transmitted to the processing system through the base, causing the processing system to be forced to vibrate. There are two types of forced vibration sources: internal vibration sources inside the machine tool and external vibration sources outside the machine tool. There are many external vibration sources, but they are all transmitted to the machine through the base.

Low frequency vibration

Low frequency vibration is usually caused by the workpiece system and tool holder system of the 1690 vertical machining center being vibrated (but in most cases, the vibration of the workpiece system is relatively large), which are separated from each other and sometimes close, resulting in equal and opposite forces and reaction forces.

During the downward milling process, the gap position between the guide screw and the nut changes, which will cause uneven feed on the worktable, resulting in impact and vibration, thereby affecting the lifespan of the machine tool and tools, as well as the surface roughness of the workpiece. When using upward milling, the cutting thickness changes from small to large, the tool load also changes from small to large, and the tool is more stable during the machining process.

Note that this is only used for precision machining, while downward milling is applied for rough machining. This is because the productivity of down milling is high and the tool life can be guaranteed. This may also be caused by oscillations in the system's own parameters, and closed-loop systems may also experience system oscillations due to poor parameter settings.