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1.发明申请公开(公告)号：US20210197335A1
公开(公告)日：2021-07-01
申请号：US16970301
申请日：2020-02-28
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Yongqing WANG , Mengmeng NIU , Kuo LIU , Bo QIN , Mingrui SHEN , Dawei LI
Abstract: The invention provides a data augmentation method based on generative adversarial networks in tool condition monitoring. Firstly, the sensor acquisition system is used to obtain the vibration signal and noise signal during the cutting process of the tool; second, the noise data subject to the prior distribution is input to the generator to generate data, and the generated data and the collected real sample data are input to the discriminator for identification, the confrontation training between the generator and the discriminator until the training is completed; then, use the trained generator to generate sample data, and determine whether the generated sample data and the actual tool state sample data are similar in distribution; finally, combined with the accuracy of the deep learning network model to predict the state of the tool to verify the availability of the generated data.
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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.
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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.
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4.发明申请公开(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.
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公开(公告)号：US20210347000A1
公开(公告)日：2021-11-11
申请号：US16972278
申请日：2020-02-28
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Yongqing WANG , Ziyou BAN , Kuo LIU , Lingsheng HAN , Fanze KONG , Siqi WANG
Abstract: The invention provides a tool holder suitable for cryogenic minimum quantity lubrication, which belongs to the technical field of cooling and lubrication of numerical control machine tools. The device comprises a toolholder body, a peripheral static structure, a multilayer sealing structure, a heat insulation structure, and a bearing support structure. The invention solves the problems of insufficient cooling performance in the micro-lubrication technology and insufficient lubrication in the cryogenic cooling machining technology, and integrates the oxygen insulation protection effect of the cryogenic medium, the cooling effect of the cryogenic medium, and the friction reduction and lubrication effect of the micro-lubrication. It has a good processing effect on difficult-to-cut materials. The invention can be used for machining difficult-to-cut materials with traditional numerical control machine tools, expands the application range of external to internal cooling tool holders, effectively reduces the cutting heat of difficult-to-cut materials in cutting processing, improves tool life, and replaces traditional cutting fluids to achieve green manufacturing.
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Patent Agency Ranking
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.
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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.
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8.发明申请公开(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.
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公开(公告)号：US20240075568A1
公开(公告)日：2024-03-07
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：US20210190627A1
公开(公告)日：2021-06-24
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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