What guarantees the machining accuracy of machine tools?

2. Semi closed loop control system

Since the measuring device is installed on the top of the motor or lead screw, it is easy to seal, so there is no requirement for the environment. The precision error of the semi closed loop control system mainly depends on the positive and negative clearance of the lead screw. With the improvement of machining technology, the manufacturing technology level of imported lead screw is higher, and the high-precision screw pair basically eliminates the forward and reverse clearance. In addition, in the assembly process, the double row reverse ball screw pair is adopted, which can completely eliminate the positive and negative clearance. In addition, many machine tool factories adopt pre stretching method to eliminate the influence of thermal deformation of machine tool on the transmission accuracy of lead screw. Therefore, the current semi closed loop control system has been able to ensure that the machine tool to achieve high accuracy.

Influence of production environment: the environment of general machining factory is bad, dust and vibration are common phenomena, but grating ruler and linear inductosyn are precision components, and their working principle is to measure relative moving position by light reflection. Dust and vibration are the biggest factors affecting measurement accuracy. In addition, the oil mist and water mist are serious in the machining process, which has a great impact on the grating ruler and linear induction synchronizer. Therefore, to use the full closed-loop control system, in addition to the installation and sealing, we must improve the production environment. Otherwise, this phenomenon will appear. The accuracy of the new machine tool is good, but it has been used for less than a year. Not only does the precision decline, but also the machine tool often alarms.

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