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公开(公告)号：US11761930B2
公开(公告)日：2023-09-19
申请号：US17260156
申请日：2020-03-06
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Yongqing Wang , Bo Qin , Kuo Liu , Mingrui Shen , Mengmeng Niu , Honghui Wang , Lingsheng Han
CPC classification number: G01N29/4481 , G01B17/08 , G01N29/14 , G05B19/401 , G06N3/04 , G06N3/08 , G01N2291/028 , G01N2291/2698 , G05B2219/33099
Abstract: A prediction method of part surface roughness and tool wear based on multi-task learning belong to the file of machining technology. Firstly, the vibration signals in the machining process are collected; next, the part surface roughness and tool wear are measured, and the measured results are corresponding to the vibration signals respectively; secondly, the samples are expanded, the features are extracted and normalized; then, a multi-task prediction model based on deep belief networks (DBN) is constructed, and the part surface roughness and tool wear are taken as the output of the model, and the features are extracted as the input to establish the multi-task DBN prediction model; finally, the vibration signals are input into the multi-task prediction model to predict the surface roughness and tool wear.
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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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公开(公告)号：US11691235B2
公开(公告)日：2023-07-04
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
CPC classification number: B23Q11/1023 , B23B31/02 , B23B2250/12 , Y10T408/455 , Y10T408/95 , Y10T409/30952 , Y10T409/304032
Abstract: A toolholder matched with the internal jet cooling spindle for cryogenic coolant 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 cutting 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 cutting tool, to ensure the stability of the coolant transport.
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公开(公告)号：US11370041B2
公开(公告)日：2022-06-28
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
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.
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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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Patent Agency Ranking
公开(公告)号：US11287400B2
公开(公告)日：2022-03-29
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: G01N29/28 , G01N29/265
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：US12026625B2
公开(公告)日：2024-07-02
申请号：US15734940
申请日：2020-02-28
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Kuo Liu , Mingrui Shen , Bo Qin , Renjie Huang , Mengmeng Niu , Yongqing Wang
Abstract: An on line prediction method of part surface roughness based on SDAE-DBN algorithm. The tri-axis acceleration sensor is adsorbed on the rear bearing of the machine tool spindle through the magnetic seat to collect the vibration signals of the cutting process, and a microphone is placed in the left front of the processed part to collect the noise signals of the cutting process of the machine tool; the trend term of dynamic signal is eliminated, and the signal is smoothed; a stacked denoising autoencoder is constructed, and the greedy algorithm is used to train the network, and the extracted features are used as the input of deep belief network to train the network; the real-time vibration and noise signals in the machining process are input into the deep network after data processing, and the current surface roughness is set as output by the network.
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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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