A built-in detection system for heat generation of CNC machine tool spindle

Abstract

The invention relates to an accessory of a numerically-controlled machine tool spindle, in particular to a built-in detection system for the heat generation rate of the numerically-controlled machinetool spindle. The built-in detection system for the heat generation rate of the numerically-controlled machine tool spindle comprises a heat flow acquisition module and a heat flow processing module,wherein the heat flow processing module is arranged on the outer surface of a spindle internal heat source and comprises a heat flow density sensor; the heat flow density sensor is used for detectingthe heat flow density of the spindle internal heat source; the heat flow acquisition module is connected with the heat flow processing module, and transmits the detected heat flow density data to theheat flow processing module in real time; the heat flow processing module comprises heat generation metering unit; and the heat generation metering unit calculates the heat generation rate of the spindle internal heat source in real time according to the detected heat flow density data and outputs a calculation result. According to the built-in detection system for the heat generation rate of thenumerically-controlled machine tool spindle provided by the invention, an operating state of the spindle internal heat source is analyzed in real time, heat source fault information is given, corresponding information can be acquired without the need for disassembling the spindle, the reduction of the accuracy caused by blind disassembling the spindle is avoided, and a basis is provided for the control on refrigerating capacity for cooling the spindle internal heat source and spindle heat characteristic analysis.

Description

technical field [0001] The invention relates to an accessory of a spindle of a numerical control machine tool, in particular to a built-in detection system for heat generation of the spindle of a numerical control machine tool. Background technique [0002] The spindle of a machine tool refers to the axis on the machine tool that drives the workpiece or tool to rotate, and is usually composed of a spindle, bearings, and transmission parts (gears or pulleys). The motion accuracy and structural rigidity of the spindle components are important factors that determine the processing quality and cutting efficiency. The electric spindle is a new technology that has appeared in the field of CNC machine tools in recent years and integrates the machine tool spindle and the spindle motor. The electric spindle is a set of components, which includes the electric spindle itself and its accessories: electric spindle, high-frequency frequency conversion device, oil Mist lubricator, cooling...

AI Technical Summary

Problems solved by technology

At present, the heat generation of the heat source in the spindle is mainly obtained through theoretical calculations. However, since the heat generation of the heat source in the spindle is related to many factors such as working conditions, preload, thermal stress, wear, and lubrication, it is difficult to accurately predict it through the model

In addition, the surface temperature method and the temperature difference method are also used to detect the heat generated by the heat source in the spindle, but due to the influence of the joint surface and boundary effects, it has the disadvantages of hysteresis, instability, and poor real-time performance; moreover, because the heat generated by the heat source in the spindle passes through the The heat conduction is transferred to the surface of the heat source, and the actual measurement value of the sensor is the result of the redistribution of the heat flow in the heat source, which seriously affects the measurement accuracy

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