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：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.

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：US20210026319A1

公开(公告)日：2021-01-28

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：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：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：US20200064126A1

公开(公告)日：2020-02-27

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: 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.

公开(公告)号：US20200064125A1

公开(公告)日：2020-02-27

申请号：US16462234

申请日：2018-01-23

Applicant: Dalian University of Technology

Inventor： Yongqing WANG ,  Haibo LIU ,  Jiakun WU ,  Kuo LIU ,  Kang KUANG ,  Dawei LI

IPC: G01B11/27

Abstract: A rapid detection method for the geometric accuracy of the linear motion axis of an NC machine tool, uses accelerometers to measure the acceleration perpendicular to the direction of motion when the linear motion axis moves at a uniform speed. Firstly, the measuring device is mounted on the linear motion axis, and the upper measurement system automatically performs multi-channel acquisition and storage of the motion point acceleration data. Then, filter the acceleration data at the different speeds. Finally, the displacement data is obtained by quadratic integration of the filtered acceleration data in the time domain. Then calculate the straightness of the linear motion axis using the End Point Fit method, and complete the rapid measurement of the straightness of the linear motion axis of the machine tool. This can realize the rapid measurement of the geometric accuracy of the linear motion axis of the machine tool.

公开(公告)号：US20210178542A1

公开(公告)日：2021-06-17

申请号：US15734912

申请日：2019-09-12

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Yongqing WANG ,  Lingsheng HAN ,  Kuo LIU ,  Haibo LIU ,  Zaiyou BAN ,  Bo QIN

IPC: B23Q11/10 ,  B23B31/02

Abstract: The invention provides a toolholder matched with the internal jet cooling spindle for cryogenic coolant. The toolholder is mainly composed of a hollow toolholder body, a high-performance thermal insulation structure and a bidirectional sealing structure. They can guide the cryogenic coolant from the spindle to the internal cooling channel of tool and realize the cryogenic thermal insulation and dynamic sealing. The high-performance thermal insulation structure inside the toolholder employs the material with a low thermal conductivity and a low linear expansion coefficient to restrain the low temperature impact of cryogenic coolant on the toolholder and spindle, to ensure the dimensional accuracy and assembly accuracy of the toolholder. The bidirectional sealing structure in the toolholder uses the ultra-low temperature resistant seal rings to prevent the cryogenic coolant from leaking towards the spindle and the tool, to ensure the stability of the coolant transport.