Thermal error compensation method for tool machine

Abstract

The invention relates to a thermal error compensation method for a tool machine. A temperature sensor is arranged in at least one heat source position of the tool machine; the tool machine is driven to run in a running condition to enable the heat source position to generate heat; the temperature sensor senses the temperature of the heat source position and a temperature sensing signal is generated; a structural heat conducting and calculating unit reads the temperature sensing signal and the running condition information of the tool machine and calculates and outputs at least one node temperature; and an error compensating and calculating unit reads the node temperature and calculates the thermal error compensation quantity of the tool machine.

Description

technical field [0001] The invention relates to a thermal error compensation method of a machine tool, in particular to a method for compensating the thermal error of a machine tool through a structural heat conduction operation unit and an error compensation operation unit in consideration of the structural geometric design and material properties of the machine tool. Background technique [0002] The problem of thermal error is a subject that must always be faced in the process of precision machinery research and development; since the 1960s, related research has never stopped, and its main purpose is to develop a systematic design logic or compensation method to suppress or Improve the error of the machine tool due to temperature variation, thereby improving the accuracy and stability of the machine tool. Although experts and scholars around the world have invested nearly half a century in research related to the thermal error of machine tools, the impact of temperature v...

AI Technical Summary

Problems solved by technology

[0014] 1) Lack of structural overall physical information: Since the thermal error mainly comes from the influence of temperature variation on the overall structure, the establishment of the error model in the past technology only refers to the sensing information of each single point temperature, which cannot reflect the overall design of the structure. Physical information such as geometry and material properties

[0015] 2) The heat source cross effect is not easy to judge: for machine tools, when the axes are in different positions, the positions of various heat sources relative to each other change accordingly, and the thermal error of the structure caused by their interaction becomes difficult to judge

In other words, even under the same sensing temperature conditions, different thermal errors may occur; therefore, for the conventional technology, it is necessary to rely on a large number of experiments to determine the sensing layout to reduce the probability of this happening

[0016] 3) Limited temperature information for the model to use: Since the parameter basis of the thermal error calculation mainly comes from the temperature value measured by the sensor, the layout of the sensor greatly affects the correctness and reliability of the compensation model. However, if you want to know The temperature behavior of the overall structure of the processing machine must use a large number of sensing components, which increases the cost of technology development

[0017] 4) Low model accuracy and reliability: Because of the above three factors, the accuracy and reliability of the compensation model are poor

Images