CN-122020918-A - Method, device, equipment and medium for in-plane detection compensation based on thermal deformation

CN122020918ACN 122020918 ACN122020918 ACN 122020918ACN-122020918-A

Abstract

The application relates to the field of machine tool processing, and particularly discloses an in-machine detection compensation method, device, equipment and medium based on thermal deformation, wherein the method comprises the steps of collecting heat source temperature data and machine tool processing data, wherein the heat source temperature data at least comprises a measuring head end temperature, a workpiece heat source end temperature and a machine tool heat source end temperature; and correcting a dimension measurement result obtained by in-machine detection based on the measurement error compensation value to obtain a dimension value of the target workpiece in a standard state. By integrating the temperature sensor at the heat source, temperature data of key parts such as a machine tool, a workpiece, a measuring head and the like are acquired in real time, and a thermal deformation error compensation model is built by combining finite element simulation data based on processing equipment, so that the problem of inaccurate measurement results caused by temperature change is solved.

Inventors

ZHANG TONGLE
SUN YUCHENG
QI XIAOLING
GUO YE
ZHUANG PENG
Zhu haijie

Assignees

潍柴动力股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. An in-machine detection compensation method based on thermal deformation is characterized by comprising the following steps: Collecting heat source temperature data and machine tool processing data, wherein the heat source temperature data at least comprises a measuring head end temperature, a workpiece heat source end temperature and a machine tool heat source end temperature; Determining a measurement error compensation value based on heat source temperature data, the machine tool processing data and a thermal deformation error compensation model, wherein the thermal deformation error compensation model is constructed based on physical characteristics of a machine tool, a workpiece and a measuring head and is used for reflecting the relation between the heat source temperature and the measurement error; And correcting the dimension measurement result obtained by in-machine detection based on the measurement error compensation value to obtain the dimension value of the target workpiece in the standard state.
2. The method of claim 1, wherein prior to the collecting heat source temperature data, the method further comprises: Building a simulation model according to the actual sizes and material properties of the machine tool, the workpiece and the measuring head; in the simulation process, based on processing parameters and time, the friction heat generation and environmental temperature parameters of all parts are combined, the heat generation and temperature change conditions in the equipment movement process and the workpiece cutting process are determined, and the heat source position is determined; And determining the model and the placement mode of the temperature sensor according to the position of the heat source.
3. The method of claim 1, wherein prior to determining the measurement error compensation value based on the heat source temperature data, the machine tool machining data, and the thermal deformation error compensation model, the method further comprises: Determining the temperature of heat source ends of different machine tools, machine tool processing data and motion deviation values of all axes of the machine tools corresponding to the ambient temperature, and establishing a machine tool thermal deformation error compensation model, wherein the machine tool processing data comprises at least one of the distance between each axis of the machine tool and each heat source, the machine tool running time, the moving distance of each axis of the machine tool, cutting tool parameters and machine tool cutting parameters; Determining the temperature of heat source ends of different workpieces, workpiece materials and workpiece size deviation values corresponding to workpiece structures, and establishing a workpiece thermal deformation error compensation model; And determining measuring head size deviation values corresponding to different measuring head end temperatures, and establishing a measuring head thermal deformation error compensation model.
4. A method according to claim 3, wherein said determining a measurement error compensation value based on heat source temperature data, said machine tool machining data and a thermal deformation error compensation model, comprises: Constructing a theoretical measurement error relation based on the motion deviation value of each axis of the machine tool, the workpiece size deviation value and the measuring head size deviation value; Under various preset working conditions, calibrating the theoretical measurement error relation by comparing the measuring head measured value with the actual size value of the workpiece to obtain an actual measurement error model; And inputting the heat source temperature data into the actual measurement error model to obtain a measurement error compensation value.
5. The method of claim 4, wherein the plurality of preset operating condition variables comprise at least one of workpiece material, spindle feed, spindle speed, and probe path.
6. The method according to claim 1, wherein the correcting the dimensional measurement result detected in the machine based on the measurement error compensation value specifically includes: In the in-machine detection process, a dimension measurement result of the measuring head on the target workpiece is obtained; And compensating the dimension measurement result based on the measurement error compensation value, and reversely solving the dimension value of the target workpiece in the standard state.
7. The method according to claim 6, wherein the correcting the measurement result obtained by the in-machine detection based on the measurement error compensation value specifically includes: Determining a measurement error compensation value and a dimension measurement result in the same direction of the target workpiece; And determining the dimension value of the target workpiece in any direction of the dimension value in the standard state based on the measurement error compensation value in the same direction and the dimension measurement result.
8. An in-machine detection compensation device based on thermal deformation, characterized by comprising: the data acquisition module acquires heat source temperature data and machine tool processing data, wherein the heat source temperature data at least comprises a measuring head end temperature, a workpiece heat source end temperature and a machine tool heat source end temperature; The compensation value determining module is used for determining a measurement error compensation value based on heat source temperature data, the machine tool processing data and a thermal deformation error compensation model, wherein the thermal deformation error compensation model is constructed based on physical characteristics of a machine tool, a workpiece and a measuring head and is used for reflecting the relation between the heat source temperature and the measurement error; And the error correction module corrects the dimension measurement result obtained by the in-machine detection based on the measurement error compensation value to obtain the dimension value of the target workpiece in the standard state.
9. An in-machine detection compensation device based on thermal deformation, characterized by comprising: and a memory communicatively coupled to the at least one processor, wherein, The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the method of any one of claims 1-7.
10. A non-transitory computer storage medium storing computer-executable instructions configured to perform the steps of the method of any one of claims 1-7.

Description

Method, device, equipment and medium for in-plane detection compensation based on thermal deformation Technical Field The application relates to the field of machine tool machining, in particular to an in-machine detection compensation method, device, equipment and medium based on thermal deformation. Background In the long-time operation process of the machining center, the machine tool body may be thermally deformed due to factors such as high-speed rotation of the spindle, continuous flushing of the cutting fluid, and fluctuation of the ambient temperature. In addition, the measuring head and the workpiece can change in size along with the temperature. The traditional in-machine detection method only depends on preset calibration parameters, can not sense the change of thermal deformation of a machine tool, a workpiece and a measuring head in real time, so that errors of detection data are accumulated, the accumulated errors can directly influence subsequent measurement results, the measurement results can not accurately evaluate the sizes of parts, no objective evaluation effect is achieved on the actual sizes, and the measurement results are only used as references in the application process. Disclosure of Invention In order to solve the above problems, the present application provides an in-machine detection compensation method, device, equipment and medium based on thermal deformation, wherein the method comprises: the method comprises the steps of collecting heat source temperature data and machine tool processing data, wherein the heat source temperature data at least comprise a measuring head end temperature, a workpiece heat source end temperature and a machine tool heat source end temperature, determining a measurement error compensation value based on the heat source temperature data, the machine tool processing data and a thermal deformation error compensation model, constructing the thermal deformation error compensation model based on physical characteristics of a machine tool, a workpiece and a measuring head and reflecting the relation between the heat source temperature and the measurement error, and correcting a dimension measurement result detected in the machine based on the measurement error compensation value to obtain a dimension value of a target workpiece in a standard state. In one example, before the heat source temperature data are collected, the method further comprises the steps of building a simulation model according to actual sizes and material properties of a machine tool, a workpiece and a measuring head, determining heat generation and temperature change conditions in the equipment movement process and the workpiece cutting process based on machining parameters and time and combining friction heat generation and environmental temperature parameters of all parts in the simulation process, determining a heat source position, and determining the model and placement mode of a temperature sensor according to the heat source position. In one example, before determining the measurement error compensation value based on the heat source temperature data, the machine tool processing data and the thermal deformation error compensation model, the method further comprises determining machine tool axis motion deviation values corresponding to different machine tool heat source end temperatures, machine tool processing data and environment temperatures, establishing a machine tool thermal deformation error compensation model, wherein the machine tool processing data comprises at least one of distance between each machine tool axis and each heat source, machine tool running time, machine tool axis moving distance, cutting tool parameters and machine tool cutting parameters, determining workpiece dimension deviation values corresponding to different workpiece heat source end temperatures, workpiece materials and workpiece structures, establishing a workpiece thermal deformation error compensation model, determining measuring head dimension deviation values corresponding to different measuring head end temperatures, and establishing a measuring head thermal deformation error compensation model. In one example, the method for determining the measurement error compensation value based on the heat source temperature data, the machine tool processing data and the thermal deformation error compensation model specifically comprises the steps of constructing a theoretical measurement error relation based on the movement deviation value of each axis of the machine tool, the workpiece size deviation value and the measuring head size deviation value, calibrating the theoretical measurement error relation by comparing the measuring head measurement value with the workpiece actual size value under various preset working conditions to obtain an actual measurement error model, and inputting the heat source temperature data into the actual measurement error model to obtain the measurement error compens