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Machine tool complete machine thermal error modeling method

A modeling method and thermal error technology, applied in the direction of measuring heat, radiation pyrometry, computer-aided design, etc., can solve the problems of not taking into account the influence of the temperature change of the machine tool workbench and the occurrence of deviation, so as to improve the effectiveness and improve The effect of precision

Active Publication Date: 2020-09-15
湖北谷城县东华机械股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the research of error compensation of CNC machine tools, comprehensive error measurement and compensation are used, but the deviation between the actual position of the tool and the ideal position is detected at a certain temperature measurement point, and the influence of temperature changes on the machine tool table is not considered or contacted. Therefore, it is necessary to establish a more accurate thermal error model of the machine tool

Method used

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  • Machine tool complete machine thermal error modeling method
  • Machine tool complete machine thermal error modeling method
  • Machine tool complete machine thermal error modeling method

Examples

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Embodiment 1

[0031] A method for modeling thermal error of a complete machine tool, the method for modeling thermal error includes the following steps:

[0032] Step 1: Carry out a thermal temperature rise experiment on the machine tool, scan the entire machine tool with an infrared thermal imager, grasp the thermal temperature distribution law of the machine tool, and arrange temperature sensors in the area where the machine tool generates a large amount of heat, as the temperature sensor of the machine tool Temperature test points to collect real-time temperature data;

[0033] Step 2: Test the thermal error of the tool tip point of the machine tool and the thermal error model of the tool tip point of the machine tool; use the tool tip point of the machine tool as a reference, establish the coordinates of the tool tip point in space with the help of a displacement sensor, and dynamically Monitor the deviation of the tool tip point with temperature to obtain the characteristics of the too...

Embodiment 2

[0039] This embodiment provides a thermal error testing arrangement structure of a machine tool tip point in a method for modeling a thermal error of a complete machine tool in the first embodiment.

[0040] Such as figure 1 As shown, a machine tool tip point thermal error test layout structure of a machine tool thermal error modeling method includes a machine tool base 1, and an X guide rail 2 and a Y guide rail 3 are arranged on the machine tool base 1 shown in sequence. The Y guide rail 3 is provided with a magnetic base 4, and the magnetic base 4 is mounted with a workbench fixture 5, and the workbench fixture 5 is symmetrically arranged on the magnetic base 4, and one of the workbench fixtures 5 The middle part of the magnetic base 4 is provided with a displacement sensor 9, and the other two displacement sensors 9 are respectively symmetrically arranged on the workbench fixture 5;

[0041] Directly above the machine base 1 is provided with a main shaft 6, the lower end ...

Embodiment 3

[0045] This embodiment provides a thermal error testing arrangement structure at a certain point on the machine tool workbench of the method for modeling the thermal error of the whole machine tool in the first embodiment.

[0046] Such as figure 2 As shown, a thermal error test layout structure of a certain point of a machine tool workbench according to a thermal error modeling method of a machine tool includes a machine tool base 1, and an X guide rail 2 and a Y guide rail 3 are sequentially arranged on the machine tool base 1 shown , the Y guide rail 3 is provided with a magnetic base 4, the magnetic base 4 is mounted with a workbench fixture 5, and the workbench fixture 5 is located in the middle of the magnetic base 4 and holds a workpiece 12 above it. ;

[0047] A main shaft 6 is provided directly above the machine tool base 1, and a main shaft sleeve 10 is set on the main shaft 6, and a sleeve clamp 11 is installed under the main shaft sleeve 10, and a sleeve clamp 11...

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Abstract

The invention discloses a machine tool complete machine thermal error modeling method, comprising the following steps: carrying out a thermal temperature rise experiment on a machine tool; according to the characteristics of the thermal errors of the tool nose point of the machine tool, establishing a relation functional expression of the errors of the tool nose point of the machine tool in the X,Y and Z directions along with the temperature change in space, namely a thermal error model of the tool nose point of the machine tool; through the characteristic that the datum point on the machinetool workbench changes along with the temperature, establishing a relation functional expression that the workbench workpiece changes along with the temperature, and obtaining a workbench workpiece point thermal error model; and performing iterative elimination in X, Y and Z directions on the tool nose point error model of the machine tool and the workpiece point thermal error model on the workbench to form a comprehensive error model in the three directions. The thermal error model is reasonable, high in accuracy and beneficial to mastering the rule that the error changes along with the temperature so as to adjust the machine tool and enable the machine tool to achieve better performance.

Description

technical field [0001] The invention relates to the technical field of machine tool thermal error testing, in particular to a method for modeling the thermal error of a complete machine tool. Background technique [0002] The error of the whole machine caused by thermal deformation accounts for a large proportion, and the thermal error accounts for nearly 40%-70% of the total error of the machine tool, and even reaches more than 70% in some high-precision instruments, indicating that the thermal error has become a modern high-precision CNC machine tool. main source of error. For a three-axis XYZ vertical machine tool, the steady temperature and instantaneous temperature of each part of the machine tool can be simulated by using the finite element analysis method. It has a great influence on the solution results of the finite element, so the infrared thermal imager can be used to grasp the thermal temperature distribution of the machine tool, and temperature sensors are arra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G01J5/00G01K13/00G06F119/08
CPCG06F30/20G01J5/00G01K13/00G06F2119/08G01J2005/0077Y02P90/02
Inventor 陈国华刘敦奇张林向华赵殿章童光庆李波陈运星
Owner 湖北谷城县东华机械股份有限公司
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