公开(公告)号：US11287795B2

公开(公告)日：2022-03-29

申请号：US16639959

申请日：2019-02-21

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Kuo Liu ,  Yongqing Wang ,  Jiakun Wu ,  Haining Liu ,  Mingrui Shen ,  Bo Qin ,  Haibo Liu

IPC: G05B19/404

Abstract: A self-adaptive compensation method for feed axis thermal error, which belongs to the field of error compensation in NC machine tools. First, based on laser interferometer and temperature sensor, the feed axis thermal error test is carried out; following, the thermal error prediction model, based on the feed axis thermal error mechanism, is established and the thermal characteristic parameters in the model are identified, based on the thermal error test data; next, the parameter identification test is carried out, under the preload state of the nut; next, the adaptive prediction model is established, based on the thermal error prediction model, while the parameters in the measurement model are identified; finally, adaptive compensation of thermal errors is performed, based on the adaptive error prediction model, according to the generated feed axis heat.

公开(公告)号：US11009857B2

公开(公告)日：2021-05-18

申请号：US16471478

申请日：2018-08-30

Applicant: Dalian University of Technology

Inventor： Kuo Liu ,  Haibo Liu ,  Te Li ,  Haining Liu ,  Yongqing Wang ,  Zhenyuan Jia

IPC: G05B19/418

Abstract: An application method of the thermal error-temperature loop in the spindle of a CNC machine tool. This uses a bar and two displacement sensors to determine radial thermal errors of the spindle. Meanwhile two temperature sensors are used to determine the temperature of the upper and lower surfaces of the spindle box. Then, the thermal error-temperature loop is drawn with the temperature difference between two temperature sensors as the abscissa and the radial thermal error of the spindle as the ordinate. Finally, the loop is employed to analyze the mechanism of the radial thermal deformation of the spindle and the thermal error level is evaluated. Since the method is based on measured data, the results of the analysis are closer to the reality, compared to those from the numerical simulations.

公开(公告)号：US10900779B2

公开(公告)日：2021-01-26

申请号：US16462238

申请日：2018-01-23

Applicant: Dalian University of Technology

Inventor： Yongqing Wang ,  Kuo Liu ,  Jiakun Wu ,  Haibo Liu ,  Zhisong Liu ,  Haining Liu

IPC: G01B21/24 ,  G01M13/02 ,  G01B11/27

Abstract: A method for the rapid detection of the linear axis angular error of an NC machine tool, belongs to the technical field of NC machine tool testing. Firstly, the measuring device is mounted on the linear axis. Then, the linear axis moves at three different speeds at a constant speed, and the upper measurement system automatically performs multi-channel acquisition and storage of the motion measurement's point measurement data. Then, based on the same geometric error signal, it is decomposed into the different frequency components, and the measurement angle error is filtered at the different speeds. Finally, the measurement angle errors at the three speeds after filtering are superimposed to complete the rapid measurement of the linear axis angular error of the machine tool. The measurement efficiency is high and data processing capability is strong.