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Talking about the Detection of the Bearing Temperature of CNC Machine Tool
Source: China Bearing Network Time: 2014-09-24
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Abstract: During the spindle operation of CNC machine tools; due to the lack of smooth spindle, smooth oil too thick and spindle machining, equipment and other factors; will lead to increased spindle bearing temperature. Spindle bearing temperature is too high; will cause data expansion; Smaller and presenting noise and mechanical damage.
Key words: CNC machine tool spindle bearing, detection 0 Introduction CNC machine tools can measure the spindle bearing temperature by measuring method. After measuring the temperature rise in the spindle bearing operation, it is known whether the spindle bearing can be normal. The bearing temperature is usually constrained to increase in temperature. Beyond 45 °C; if the temperature of the bearing is found to exceed 70-80 °C during monitoring; it should be stopped.
1 device and wiring CNC machine tools can use the connection of thermal resistance, multi-channel digital appearance and PLC control system; to complete the spindle bearing temperature detection.
In front, middle and rear bearings of the spindle; 4 thermal resistance devices are installed. The PLC control system collects the temperature of 4 measuring points; to monitor the temperature rise of the bearing at different orientations.
2 Control requirements and principle The temperature control system uses the thermal resistance to measure the temperature of the measuring point; the multi-channel digital appearance is used to visualize the temperature value of the spindle bearing. The PLC completes the functions of parameter setting, long-distance monitoring, data storage and alarm handling. During the programming process; there is no need to write a program to read and write PLC registers; after the data boundary method; after the I/O variables are defined; the variable names can be directly used for system control, operation display, data record and alarm.
The system sets a launch button to start the control program; set two red and green indicators to show the temperature. The temperature of the four measuring points is within the demand range; the green light is on; indicating that the spindle can work normally, when the temperature of a certain measured point When the upper limit is reached; even if the spindle speed has not reached the demand; the red light is on; the corresponding bearing alarm on the CNC system appears. The operator immediately suspends the operation; and according to the corresponding alarm number, the situation of the corresponding bearing position of the spindle bearing is checked. Then prevent the spindle bearing from grinding the appearance.
3 Conclusion Modern PLC has obvious features such as strong function, high integration, strong anti-interference ability, sensitive configuration and stable operation. It is widely used in the automatic control of modern industry. PLC can expand some intelligent control modules; constitute different control The system; the detection of the spindle bearing temperature mentioned in this paper is the intelligent temperature control system centered on PLC; the operation is convenient; the reliability is good; it has important practical significance.
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