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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：US10921772B2
公开(公告)日：2021-02-16
申请号：US16311922
申请日：2018-01-07
Applicant: Dalian University of Technology
Inventor： Jianwei Ma , Zhenyuan Jia , Dening Song , Fuji Wang , Wei Liu , Ning Zhang , Siyu Chen , Guangzhi He
Abstract: The invented equivalent-plane cross-coupling control method belongs to high-precision and high-efficiency intelligent multi-axis CNC (Computer Numerical Control) machining filed, featured a three-axis cross-coupling controller based on the equivalent plane which can be used for improvement of the three-dimensional contour-following accuracy. This method first find the foot point from the actual motion position to the desired contour using a tangential back stepping based Newton method. Then, establish an equivalent plane which containing the spatial contouring-error vector by passing through the actual motion position and the tangential line at the foot point. After that, estimate the three-dimensional contouring error in a scalar form, thus controlling the signed error using a PID based two-axis cross-coupling controller. Finally, calculate the three-axis control signals according to the geometry of the equivalent plane, thus realizing the three-axis contouring-error control by using the well-studied two-axis contour controllers.
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公开(公告)号：US10751810B2
公开(公告)日：2020-08-25
申请号：US16465266
申请日：2018-05-10
Applicant: Dalian University of Technology
Inventor： Fuji Wang , Zhenyuan Jia , Meng Zhao , Yu Bai , De Cheng , Chong Zhang
IPC: B23B51/02
Abstract: A vertical-edge double-step sawtooth cutter for preparing high-quality holes of composite material and thereof hybrid stack structure, and has three parts which are a major cutting edge region A, a minor cutting edge region B and a shank region C. The minor cutting edge region B comprises a step vertical-edge region D and a sawtooth cutting region E. This has the step structure and the sawtooth structure which is distributed in the first step, has a recutting function at the inlet and a reverse cutting function at the outlet in the direction opposite to the main cutting motion. The cutter has the vertical edge structure distributed in the second step, and the angle of the second step is a negative value, thereby realizing chip breaking and crushing, reducing scratch to the upper-layer composite material and metal hole walls.
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4.发明授权公开(公告)号：US11429081B2
公开(公告)日：2022-08-30
申请号：US16753206
申请日：2019-08-19
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Jianwei Ma , Zhenyuan Jia , Xiao Lu , Wenwen Jiang , Xiaoxuan Zhao , Wei Liu , Likun Si
IPC: G05B19/402
Abstract: A toolpath topology design method based on vector field in sub-regional processing for the curved surface is disclosed which comprising: finding the functional relationships in feeding direction between the chord error and the normal curvature and between the scallop-height error and the normal curvature; establishing the bi-objective optimization model and calculating the optimal feeding direction at each cutting contact point within the surface through the constructed evaluation function, the space vector field is built; calculating divergence and rotation of the projected vector field and according to whether them are zeros or not to classify different sub-regions, the primary surface segmentation is achieved, etc. The method is applied for the complex curved surface processing, which can reduce the machining error and enhance the feed motion stability.
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公开(公告)号：US11188056B2
公开(公告)日：2021-11-30
申请号：US16322290
申请日：2018-01-07
Applicant: Dalian University of Technology
Inventor： Zhenyuan Jia , Jianwei Ma , Dening Song , Siyu Chen , Guangzhi He , Fuji Wang , Wei Liu
IPC: G05B19/416
Abstract: This invention, a feedrate scheduling method for five-axis dual-spline curve interpolation, belongs to multi-axis NC (Numerical Control) machining filed, featured a feedrate scheduling method with constant speed at feedrate-sensitive regions under axial drive constraints for five-axis dual-spline interpolation. This method first discretizes the tool-tip spline with equal arc length, thus getting the relation between the axial motion and the toolpath by computing the first, second, and third order derivatives of the axial positions with respect to the tool-tip motion arc length. After that, determine the feedrate-sensitive regions with the constraints of axial drive limitations and the objective of balanced machining quality and efficiency. Finally, determine the acceleration/deceleration-start-point curve parameters by bi-directional scanning. The invented method can effectively make a balance between the feed motion stability and efficiency in five-axis machining, and possesses a high computational efficiency and a good real-time capability.
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Patent Agency Ranking
公开(公告)号：US11654568B2
公开(公告)日：2023-05-23
申请号：US16647654
申请日：2019-05-15
Applicant: Dalian University of Technology
Inventor： Wei Liu , Bing Liang , Mengde Zhou , Kun Liu , Yang Zhang , Di Feng , Xintong Jiang , Likun Si , Zhenyuan Jia
CPC classification number: B25J9/1692 , B25J9/1694 , B25J19/027 , G01B21/042 , G01B21/045
Abstract: A 3D measurement model and the spatial calibration method based on a 1D displacement sensor are proposed. A 3D measurement system based on a fixed 1D displacement sensor is established; then a spatial measurement model based on the 1D displacement sensor is established; and then based on the high precision pose data of the measurement plane and sensor measurement data, spatial calibration constraint equation are established; a weighted iterative algorithms is employed to calculate the extrinsic parameters of the 1D sensor that meet the precision requirements, then the calibration process is completed. A high precision 3D measurement model is established; a 3D measurement model based on a 1D displacement sensor is established, and the calibration method of the measurement model is proposed, which will improve the precision of the 3D measurement model and solve the problem of inaccurate spatial measurement caused by the errors of the sensor extrinsic parameters.
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公开(公告)号：US11029286B2
公开(公告)日：2021-06-08
申请号：US16467376
申请日：2017-07-03
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Renke Kang , Zhigang Dong , Xianglong Zhu , Yidan Wang , Xun Zhang , Ping Zhou , Zhenyuan Jia
Abstract: An ultrasonic cutter detection method and device, the method comprises the following steps: preliminary detection: frequency amplitude detection and fall-of-potential detection, if the ultrasonic cutter fails the above two detection solutions in the preliminary detection, repeating the two detections; if the ultrasonic cutter still fails the above two detection solutions, the ultrasonic cutter is judged to be unqualified; and reinspection: free modal detection and pressure modal detection. Using differences of the ultrasonic cutters surface in micro-crack directions that result in different degrees of sensitivity of crack to different ultrasonic vibration modes, combined with the fall-of-potential method and frequency amplitude detection method, a detection rate and a detection velocity of an unqualified ultrasonic cutter can be improved.
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公开(公告)号：US11014211B2
公开(公告)日：2021-05-25
申请号：US16338971
申请日：2017-11-07
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Wei Liu , Zhenyuan Jia , Xiao Li , Yi Pan , Xin Ma , Jianwei Ma
Abstract: A monocular vision six-dimensional measurement method for high-dynamic large-range arbitrary contouring error of a CNC machine tool of the present invention belongs to the field of dynamic error detection of machine tools, and relates to a six-dimensional measurement method for high-dynamic large-range arbitrary contouring error of a CNC machine tool using a monocular vision measurement technology with short-time stroboscopic illumination and a priori standard plate. The method designs a measurement fixture and a measurement system, and uses a monocular vision pose algorithm to improve both the visual measurable dimension and range of interpolated contour in combination with priori knowledge. In light of the principle of error distribution, a small field of view is used to enhance the measurement accuracy of the coded primitives in the images. Then, by traversing all the acquired images using the proposed method, we can obtain the six-dimensional motion contour; and the six-dimensional contouring error caused by the imperfect machine interpolation can be computed by comparing the measured contour with the nominal one. The method enhances the measurable dimension of the vision technology through the monocular vision pose algorithm in combination with a datum transformation method, and realizes the six-dimensional measurement of large-range arbitrary contouring error of the CNC machine tool under the small field of view.
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9.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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10.发明授权公开(公告)号：US10969298B2
公开(公告)日：2021-04-06
申请号：US16761778
申请日：2019-09-20
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Wei Liu , Mengde Zhou , Bing Liang , Linlin Tang , Zhuang Yao , Zhengquan Wen , Yang Zhang , Likun Si , Zhenyuan Jia
Abstract: A multi-dimensional vibration control method based on piezoelectric ceramic actuator applied to wind tunnel test of aircraft model. The pitch and yaw acceleration sensors arranged on the center of mass of the aircraft model are used to measure the two components of the main vibration acceleration of the aircraft model, and the main vibration vector of the aircraft model is obtained and the real-time vibration plane of the strut is determined. Inertia is introduced to solve the dynamic bending moment on the active section of the multi-dimensional vibration damper, and then the stress distribution on the active section is obtained. The multi-dimensional active vibration control system is adopted to improve the stability and reliability of the active vibration control system of wind tunnel model, extend the service life of piezoelectric ceramic actuator, and ensure the quality of wind tunnel test data and the safety of wind tunnel test.
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