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公开(公告)号：US11969846B2
公开(公告)日：2024-04-30
申请号：US17785657
申请日：2021-11-17
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Haibo Liu , Chengxin Wang , Yongqing Wang , Xu Li , Kuo Liu , Xiaofei Ma , Dongming Guo
CPC classification number: B23Q3/086 , B23Q3/065 , B23Q2703/10
Abstract: The present invention proposes an in-situ freezing machining method for an integrated thin-walled array structure. In the method, the area among cups is cut off first; then, the outer walls of a cup array are machined; and finally, water filling and freezing are carried out, and in-situ freezing machining of the inner walls of the cup array is carried out. Then, hoisting and turning over are carried out, and the area among cavities is cut off; then, the outer walls of a cavity array are machined; and finally, water filling and freezing are carried out, and in-situ freezing machining of the inner walls of the cavity array is carried out. The method realizes in-situ freezing clamping of workpieces, avoids error accumulation caused by repeated installation of a fixture, and can refrigerate efficiently, suppress ambient and cutting thermal interference, and ensure the stability of freezing fixture.
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公开(公告)号：US11345054B2
公开(公告)日：2022-05-31
申请号：US17280716
申请日：2020-06-01
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Te Li , Yongqing Wang , Haibo Liu , Qile Bo , Boyao Cui , Jianhui Deng , Kuo Liu
Abstract: A magnetic-induced stiffness changed soft robot drive module includes magnetic-induced stiffness changed layer, two-degree-of-freedom pneumatic driver, magnetic core and sealing fixing device. The magnetic-induced stiffness changed layer and two-degree-of-freedom pneumatic driver are printed and formed. The magnetic core can be deformed together with the driver, and a magnetic field can be generated when it is energized. After the magnetic core is installed into the two-degree-of-freedom pneumatic driver, then assembled with the sealing fixing device, a soft robot drive module with one end fixed is finished. The magnetic-induced stiffness changed layer has the fast, reversible and controllable stiffness adjustment ability under the action of electromagnetic field. As its hardness is greater than that of the two-degree-of-freedom pneumatic driver and its position is outside the air cavity, the two-degree-of-freedom pneumatic driver can be restricted from over-expansion and over-extension in the axial direction, making its pneumatic bending deformation controllable.
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公开(公告)号：US11333571B2
公开(公告)日：2022-05-17
申请号：US15734881
申请日：2019-09-16
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Yongqing Wang , Lingsheng Han , Kuo Liu , Fanze Kong , Haibo Liu , Yongquan Gan , Minghua Dai
Abstract: The invention provides a dynamic seal test device for cryogenic fluid medium. The dynamic seal test device includes stator unit, rotor unit, slipway, servo motor unit and sensors. The tested seal is installed inside the stator, and the thermal insulation stator and vacuum rotor together form a dynamic seal test structure. The seals and shaft sleeves can be flexibly replaced, which is beneficial to study the influence of different seal types, structure, and seal land configurations on the sealing performance. The servo motor provides power for the rotor and controls the rotation speed. The device greatly improves the thermal insulation capacity to avoid the gasification for the cryogenic fluid medium induced by the heat transfer from environment so that ensuring the stability of the test device.
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公开(公告)号：US10946459B2
公开(公告)日：2021-03-16
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
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.
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公开(公告)号：US11125552B2
公开(公告)日：2021-09-21
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.
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Patent Agency Ranking
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.
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7.发明授权公开(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.
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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
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.
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公开(公告)号：US10814448B2
公开(公告)日：2020-10-27
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: G05B19/414 , B23Q17/09 , B23Q15/12
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.
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10.发明授权公开(公告)号：US11467066B2
公开(公告)日：2022-10-11
申请号：US16470925
申请日：2019-02-21
Applicant: Dalian University of Technology
Inventor： Kuo Liu , Yongqing Wang , Haibo Liu , Xu Li , Mingrui Shen , Mengmeng Niu , Ziyou Ban
Abstract: A method for determining the preload value of the screw based on thermal error and temperature rise weighting. Firstly, thermal behavior test of the feed shaft under typical working conditions is carried out to obtain the maximum thermal error and the temperature rise at the key measuring points in each preloaded state. Then, a mathematical model of the preload value of the screw and the maximum thermal error is established; meanwhile, another mathematical model of the preload value of the screw and the temperature rise at the key measuring points is also established. Finally, the optimal preload value of the screw is obtained. The thermal error of the feed shaft and the temperature rise of the moving components are comprehensively considered, improving the processing accuracy and accuracy stability of the machine tool, and ensuring the service life of the moving components such as bearings.
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