公开(公告)号：US20210095959A1

公开(公告)日：2021-04-01

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

IPC: G01B21/04 ,  B25J9/16 ,  B25J19/02

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.

公开(公告)号：US20210107109A1

公开(公告)日：2021-04-15

申请号：US17023012

申请日：2020-09-16

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Fuji WANG ,  Jianbo YAN ,  Meng ZHAO ,  Boyu ZHANG ,  Rao FU ,  Wei LIU ,  Jianwei MA ,  Zhenyuan JIA

IPC: B24B3/32

Abstract: A method for machining a drill with tilting blade slot structures for composite machining is provided. In the machining method, a face of the drill produces a downward component force for the inlet material to inhibit the inlet material from turning up; and a cutting edge inclination of an end surface at an outer turning point in a corner region of the drill is a positive value. The face and a flank are firstly partially ground in the corner region of the drill. The face at the outer turning point is ground with a grinding wheel to obtain two tilting blade slot structures. After grinding, a new face and a new cutting edge are obtained; and the cutting edge inclination on the end surface formed by the new cutting edge and a reference plane is a positive angle.

公开(公告)号：US20200061769A1

公开(公告)日：2020-02-27

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

IPC: B23Q17/24

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.

公开(公告)号：US20180257150A1

公开(公告)日：2018-09-13

申请号：US15750677

申请日：2016-08-18

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Zhenyuan JIA ,  Fuji WANG ,  Rao FU ,  Yu BAI ,  Bin NIU ,  Wei LIU ,  Jianwei MA ,  Chunling HE

IPC: B23B51/00 ,  B23B51/08

CPC classification number: B23B51/009 ,  B23B51/02 ,  B23B51/08 ,  B23B2226/275 ,  B23B2251/285

Abstract: A kind of sawtooth structure with reversed cutting function and its drill series are specifically fitted for drilling carbon fiber reinforced polymers (CFRP). The sawtooth structure is constructed by sawteeth and grooves located on the cutting edges of drill. And the sawtooth structure is helically arranged with a large helix angle around the axis of the drill. It can be divided into left-hand sawtooth structure and right-hand sawtooth structure by the helix angle. The bottom edges of the left-hand sawtooth function as cutting edges, and the rake angles are positive, while the top edges of the right-hand sawtooth are ground as positive rake angles. The sawtooth structure can be applied into multiple drilling tools, which proves to be universal. And it can effectively reduce delamination at both hole entry and hole exit as well as burrs defects. The series of drilling tools are double point angle drill, twist drill and stepped drill with sawtooth structure on the cutting edges. And such forms of drilling tools can achieve hole drilling of CFRP with minimum drilling defects. The drilling performance of the tools is thus improved to a great extent, and the tool life is extended while maintaining low usage costs.

公开(公告)号：US20210170619A1

公开(公告)日：2021-06-10

申请号：US17082881

申请日：2020-10-28

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Fuji WANG ,  Shen QIU ,  Rao FU ,  Boyu ZHANG ,  Meng ZHAO ,  Wei LIU ,  Jianwei MA

IPC: B26D7/18 ,  B26F1/16

Abstract: Multi-adaptive fast loading attached air-cooled dust removal equipment is disclosed. The equipment is mainly composed of five parts: a spindle clamping mechanism, a link mechanism, a bearing connecting mechanism, an axial telescopic mechanism and a dust treatment mechanism. The equipment is connected with a tool holder through an axial connecting mechanism and installed on a machine tool. The axial telescopic mechanism forms a cavity with a processing surface, the gas flow generated by a negative pressure vacuum cleaner forms negative pressure in the cavity, and the telescopic mechanism is fixed to a machine tool spindle housing through the link mechanism to prevent the rotation of the spindle from driving the equipment to rotate and interfere with a workpiece, finally realizing rapid collection and treatment of chips.

公开(公告)号：US20210048791A1

公开(公告)日：2021-02-18

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.

公开(公告)号：US20200004228A1

公开(公告)日：2020-01-02

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.

公开(公告)号：US20190317468A1

公开(公告)日：2019-10-17

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

IPC: G05B19/19 ,  G05B11/42

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.