公开(公告)号：US20200232885A1

公开(公告)日：2020-07-23

申请号：US16481035

申请日：2018-08-28

Applicant: Dalian University of Technology

Inventor： Kuo LIU ,  Yongqing WANG ,  Jiakun WU ,  Haoqi DONG ,  Te LI ,  Haibo LIU

IPC: G01M99/00 ,  G05B19/4155

Abstract: A reliability evaluation method for CNC machine tools based on Bayes and fault tree, belongs to the technical field of reliability evaluation for CNC machine tools. First, the CNC machine tool is regarded as a system composed of subsystems, and the subsystem fault data of the same production batch is used as the prior information. Next, the joint probability density function of the failure rate of each failure subsystem is used as the likelihood function of the field data, and the logarithmic inverse Gamma distribution is used as the conjugate prior distribution of the reliability. Based on this, the joint prior distribution probability density function of Weibull distribution size and shape parameters is determined Finally, the fault tree model is established. This can increase the sample size of the prior information, eliminate the complicated sample compatibility test, and ensure the compatibility of the prior information.

公开(公告)号：US20210178535A1

公开(公告)日：2021-06-17

申请号：US17052668

申请日：2020-02-28

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Yongqing WANG ,  Tianran LIU ,  Haibo LIU ,  Kuo LIU ,  Te LI ,  Dongming GUO

IPC: B23Q1/01 ,  B23C3/18 ,  B23Q5/10 ,  B23Q5/28 ,  B23Q5/40

Abstract: The present invention relates to a slanting-bed feed processing machine tool of a large propeller. The machine tool comprises a slanting column feed bed, a machine tool spindle, a workpiece rotary worktable, a large propeller and a bed feed mechanism. The present invention coordinates the geometrical relationship between the machine tool and the large propeller to ensure that the slanting column feed bed moves between two blades, thereby reducing the overhang length of the spindle. Different forms of workpiece rotary worktables and bed feed mechanisms are selected according to different slanting column feed beds. Four types of slanting column feed beds are designed, which can be selected, optimized and applied for different processing objects. The present invention enhances the processing stiffness of the spindle and solves the problem of poor processing quality of the large propeller caused by machine tool vibration.

公开(公告)号：US20200272134A1

公开(公告)日：2020-08-27

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：US20200064810A1

公开(公告)日：2020-02-27

申请号：US16325984

申请日：2017-11-06

Applicant: Dalian University of Technology

Inventor： Kuo LIU ,  Yongqing WANG ,  Haibo LIU ,  Te LI ,  Haining LIU ,  Dawei LI

IPC: G05B19/404 ,  B23Q11/14 ,  B23Q17/22

Abstract: The invention provides a method for modeling and compensating for the spindle's radial thermal drift error in a horizontal CNC lathe, which belongs to the field of error compensation technology of CNC machine tools. Firstly, the thermal drift error of two points in the radial direction of the spindle and the corresponding temperature of the key points are tested; then the thermal inclination angle of the spindle is obtained based on the thermal tilt deformation mechanism of the spindle, and the correlation between the thermal inclination angle and the temperature difference between the left and right sides of the spindle box is analyzed. According to the positive or negative thermal drift error of the two points that have been measured and the elongation or shortening of the spindle box on the left and right sides, the thermal deformation of the spindle is then classified and the thermal drift error model under various thermal deformation attitudes is then established. Then the influence of the size of the machine tool's structure on the prediction results of the model is analyzed. In real-time compensation, the thermal deformation attitude of the spindle is automatically judged according to the temperature of the key points, and the corresponding thermal drift error model is automatically selected to apply the compensation to the spindle. The method is used to distinguish the thermal deformation attitude of the spindle in a CNC lathe, and the thermal deformation mechanism is used to predict the radial thermal drift error of the spindle.

公开(公告)号：US20210072195A1

公开(公告)日：2021-03-11

申请号：US16767019

申请日：2019-09-29

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Yongqing WANG ,  Haibo LIU ,  Te LI ,  Meng LIAN ,  Kuo LIU ,  Zhenyuan JIA

IPC: G01N29/265 ,  G01N29/28

Abstract: A large-panel ultrasonic on-machine scanning thickness measurement equipment and method is disclosed. A GNCMT is adopted as the measuring machine main body on which a measured large panel is clamped and conducts scanning measurement motion; a non-contact ultrasonic measurement device is installed on the spindle of the machine tool for realizing transmission and acquisition of ultrasonic signals; a coupling liquid circulation system with the functions of multi-layer filtering, flow monitoring and regulation is set up; a jet flow immersion coupling mode is adopted on the surface of the measured large panel, and micro-emulsion cutting fluid is used as compatible coupling liquid of ultrasonic on-machine thickness measurement; and the coupling liquid is recycled, purified and stably supplied circularly. The thickness measurement equipment has high multi-function integration and reliable performance. It is easy to operate and highly automated, which effectively realizes nondestructive, accurate, efficient on-machine wall thickness measurement of the large panel.

公开(公告)号：US20200282503A1

公开(公告)日：2020-09-10

申请号：US16483256

申请日：2018-08-28

Applicant: Dalian University of Technology

Inventor： Kuo LIU ,  Haibo LIU ,  Te LI ,  Heng CHU ,  Yongqing WANG ,  Zhenyuan JIA

IPC: B23Q17/09 ,  B23Q15/12 ,  G05B19/414

Abstract: A comprehensive performance evaluation method for the CNC machine tools based on an improved pull-off method belongs to the technical field of performance evaluation of CNC machine tools. A linear proportional method is used to standardize the performance index data of machine tool. The entropy weight method and mean variance method are used to determine the two objective weights of each level of indicator. Based on the principle of vector A comprehensive evaluation of three-level index is obtained from the linear weighted evaluation function. Finally, a similar method was used to calculate the comprehensive evaluation of a large system layer by layer. The present invention is used for the comprehensive performance evaluation of various CNC machine tools and also for a lateral comparison of specific performance of different machine tools, providing a scientific and possible evaluation method and process for the comprehensive performance evaluation of machine tools.

公开(公告)号：US20230191521A1

公开(公告)日：2023-06-22

申请号：US17981126

申请日：2022-11-04

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Te LI ,  Tian LAN ,  Haibo LIU ,  Yuhang GE ,  Qile BO ,  Kuo LIU ,  Xingjian LIU ,  Xu LI ,  Yongqing WANG

IPC: B23K9/028

CPC classification number: B23K9/0284

Abstract: The present invention relates to a process method for conformal processing of a cylindrical shell inner weld seam by a special mobile robot, a laser scanner is used to scan a cylindrical shell inner weld seam to obtain point cloud data of a contour of a weld seam area first. Weld seam feature identification is carried out to each generatrix, and misidentified generatrices are filtered out to obtain weld seam left and right boundaries. An ideal weld seam processing contour is generated conformally according to the appearance of the weld seam area, weld seam coarse grinding is carried out after correction and compensation, and weld seam contour information after coarse grinding is obtained by scanning after the coarse grinding is completed. Process parameters of the grinding are controlled according to an actual weld seam contour, and weld seam fine grinding is carried out to obtain a smooth weld seam contour.

公开(公告)号：US20210023667A1

公开(公告)日：2021-01-28

申请号：US16636268

申请日：2019-02-21

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Kuo LIU ,  Te LI ,  Yongquan GAN ,  Wei HAN ,  Dawei LI ,  Zhisong LIU ,  Yongqing WANG

IPC: B23Q11/00 ,  G05B19/404

Abstract: An online geometric/thermal error measurement and compensation system for computer numerically controlled (CNC) machine tools belonging to the technical field of error testing and compensation of CNC machine tools. The online CNC machine tool geometric/thermal error measurement and compensation system includes two parts: the hardware platform and the measurement and compensation software. The hardware platform includes a unidirectional acceleration sensor, a precision integrated circuit (IC) temperature sensor, a multi-channel temperature data collector, and a geometric/thermal error measurement and compensation host. The error measurement and compensation software runs in the geometric/thermal error measurement and compensation host and realizes testing and compensation of geometric and thermal errors in machine tools, which are communicated to the FANUC CNC system.

公开(公告)号：US20200376571A1

公开(公告)日：2020-12-03

申请号：US16766557

申请日：2019-09-29

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Haibo LIU ,  Qi LUO ,  Junpeng WANG ,  Te LI ,  Kuo LIU ,  Yongqing WANG

IPC: B23C3/18 ,  F01D5/14 ,  F04B45/08 ,  G05B19/402

Abstract: A magnetorheological support method for blisk processing is disclosed. In the method, a fork structure and a soft film are used to wrap magnetorheological fluid. The magnetorheological fluid is used for flow filling under certain pressure. The bulged soft film can conduct shape matching on the surface of a blisk blade. The magnetorheological fluid can be cured through magnetic field excitation, thereby ensuring the flexible support for a weak rigid component. Electric permanent magnets are symmetrically arranged at both ends of the fork structure to construct a uniform magnetic field that can realize a global excitation of magnetorheological fluid, so that the magnetorheological fluid works in a shear mode to achieve damping force controlling by magnetic field. The solid-liquid conversion of the magnetorheological fluid is controlled by an electric permanent magnet field.

公开(公告)号：US20200311321A1

公开(公告)日：2020-10-01

申请号：US16603467

申请日：2019-02-21

Applicant: Dalian University of Technology

Inventor： Kuo LIU ,  Haibo LIU ,  Lingsheng HAN ,  Yongquan GAN ,  Wei HAN ,  Te LI ,  Yongqing WANG

IPC: G06F30/17 ,  G01N25/16 ,  G01N25/18

Abstract: The present invention provides a method for determining the real-time thermal deformation attitude of the spindle and it belongs to the technical field of error testing of the CNC machine tools. Firstly, the temperature and the displacement sensors are applied to determine the temperature of the upper and lower surfaces of the spindle box and the radial thermal error of the running spindle, respectively. Then, the thermal variation of the upper and lower surfaces of the spindle box is calculated in accordance with the radial thermal error of the spindle. Then the model for the thermal variation and the temperature of the upper and lower surfaces of the spindle box is established. Finally, the established model is employed to determine the real-time thermal deformation attitude of the spindle, according to the real-time temperatures of the upper and lower surface of the spindle box.