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Data processing method for realizing machine tool robustness thermal error compensation of wide-range environment temperature

An ambient temperature and data processing technology, applied in computer control, instruments, simulators, etc., can solve problems such as reducing the robustness of thermal error prediction models, the prediction robustness of models, and the impact of time series models

Inactive Publication Date: 2016-06-22
HEFEI UNIV OF TECH
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Problems solved by technology

When the ambient temperature of the CNC machine tool changes greatly, the coupling between temperature sensors will have a more serious impact on the time series model than the multiple linear regression, seriously reducing the prediction robustness of the thermal error prediction model

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  • Data processing method for realizing machine tool robustness thermal error compensation of wide-range environment temperature
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  • Data processing method for realizing machine tool robustness thermal error compensation of wide-range environment temperature

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Embodiment Construction

[0066] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific examples.

[0067] see figure 1 , a data processing method for realizing thermal error compensation of machine tool robustness in a wide range of ambient temperature, the steps are as follows:

[0068] Step 1: Obtain the temperature variable ΔT of the machine tool i and spindle thermal deformation S j , where i=1, 2, . . . , m.

[0069] The m refers to the number of temperature variables. Said j refers to the axial direction of the machine tool spindle, and j is X, Y, and / or Z. X, Y, and Z respectively represent the X axis of the machine tool spindle, the Y axis of the spindle, and the Z axis of the spindle.

[0070] by the temperature variable ΔT i and spindle thermal deformation S j The correlation relationship to obtain the temperature independent variable X k , k=1, 2, . . . , n.

[0071] The temperature argument X k It is used to esta...

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Abstract

The invention discloses a data processing method for realizing machine tool robustness thermal error compensation of wide-range environment temperature. The data processing method comprises the steps that 1. a modeling temperature independent variable Xk is extracted; 2. standardized processing is performed on the Xk, and an expression of a main component Zk is obtained through standardized temperature independent variable Xk* conversion; 3. previous p main components are extracted for participating in modeling; 4. standardized processing is performed on spindle thermal deformation quantity Sj, and standardized thermal deformation quantity Sj* and a multivariate linear regression equation between the previous p main components are established; 5. the Sj* and the regression equation between the previous p main components are converted into an equation of the Sj* and the Xk*; and 6. the regression equation of the Sj* and the Xk* is converted into an equation of the Sj and the Xk, and a thermal error compensation model is established; and the prediction performance of the thermal error model is further analyzed. Influence of coupling performance between the temperature independent variables on distortion of a model independent variable estimation value can be suppressed so that the data processing method has high prediction precision and prediction robustness.

Description

technical field [0001] The invention relates to a data processing method for machine tool robust thermal error compensation, in particular to a data processing method for compensating and predicting machine tool thermal error within a wide range of ambient temperatures. Background technique [0002] CNC machine tools are important equipment in the manufacturing field, and their processing performance is one of the main symbols of the development level of a country's manufacturing industry. In the process of CNC machine tool processing, due to the thermal error caused by the uneven temperature rise of various parts of the machine tool, the relative correct position between the tool and the workpiece has changed, resulting in the processing error of the workpiece. According to statistics, the thermal error of CNC machine tools accounts for about 40-70% of the total error of the machine tool. It is an effective and economical means to improve the machining accuracy of the mach...

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Application Information

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IPC IPC(8): G05B19/408
CPCG05B19/4086G05B2219/35356
Inventor 苗恩铭刘义徐建国刘辉
Owner HEFEI UNIV OF TECH
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