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公开(公告)号：US11660662B2
公开(公告)日：2023-05-30
申请号：US17918347
申请日：2022-06-15
发明人： Zhongde Shan , Haoqin Yang , Jianpei Shi
摘要： An interlayer pre-cooling apparatus for a sand mold freezing printing includes a sand paving apparatus. The sand paving apparatus is located above a negative-pressure low-temperature forming chamber, and the sand paving apparatus includes several independent sand paving grooves, a hollow sand paving roller, a cooling chamber, a sand scraping plate, and an openable and closable baffle. The openable and closable baffle is rotationally arranged at a discharge port of each sand paving apparatus, and the openable and closable baffle is used for paving low temperature premixed sand on demand. The premixed molding sand is further cooled during the process of scraping and compacting low-temperature molding sand. When the apparatus is adopted for sand mold freezing 3D printing, the low temperature of the premixed molding sand is precisely controllable, which has great significance for realizing interlayer pre-cooling of the sand mold freezing printing.
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公开(公告)号：US12128474B2
公开(公告)日：2024-10-29
申请号：US18037783
申请日：2022-09-05
发明人： Haoqin Yang , Zhongde Shan , Qinjiang Liu , Jianpei Shi , Dandan Yan , Shijie Dong
摘要： A method for preparing a negative pressure film-covering frozen sand mold includes: directly obtaining a mold cavity of a sand mold through numerically controlled machining of a frozen sand blank; covering a surface, brushed with a thermal insulation coating, of the mold cavity of the sand mold with a softened thin film, and covering an outer surface of the sand mold with a back film to seal a sand box; fixing the frozen sand mold in an air extraction sand box with a vacuum chamber, and extracting air through a vacuum pump, so that the thin film tightly adheres to the sand mold through vacuum suction force; and closing the box to obtain an integral sand mold, and pouring a casting at room temperature or low temperature under negative pressure. The method is environment-friendly, and the prepared frozen sand mold has high strength and is convenient for sand cleaning.
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公开(公告)号：US11823425B2
公开(公告)日：2023-11-21
申请号：US18316326
申请日：2023-05-12
发明人： Jun Wang , Zhongde Shan , Shiyan Hua , Dawei Li
IPC分类号： G06V10/774 , G06T7/00 , G06V10/764 , G06T7/73 , G06V10/77 , G06V10/82
CPC分类号： G06V10/774 , G06T7/0004 , G06T7/73 , G06V10/764 , G06V10/7715 , G06V10/82 , G06T2207/20021 , G06T2207/20081 , G06T2207/20084 , G06T2207/30164
摘要： A few-shot defect detection method based on metric learning, including: (S1) performing data enhancement on a to-be-detected few-shot defect data set through a G2-Generative adversarial network (G2-GAN); (S2) extracting features of a defect data set similar to the to-be-detected few-shot defect data set based on an adaptive convolution kernel-based convolutional neural network (SKM-CNN) to generate a pre-training model; and (S3) transferring the pre-training model to a few-shot defect detection network (S2D2N) based on metric learning; and performing target feature extraction and metric learning in sequence to realize rapid identification and location of defects.
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公开(公告)号：US11544837B2
公开(公告)日：2023-01-03
申请号：US17574843
申请日：2022-01-13
发明人： Zhongde Shan , Jun Wang , Zhengyuan Wei , Honghua Chen , Qian Xie
IPC分类号： G06K9/00 , G06T7/00 , G06T7/55 , G06T7/70 , G06V10/74 , G06V10/75 , G06V10/24 , G06V10/10 , G01B11/16 , G01B11/00
摘要： A method for dynamically measuring deformation of a rotating-body mold, including: (S1) subjecting an overall outer surface of the rotating-body mold to three-dimensional measurement to acquire an initial point cloud data; (S2) shooting, by a multi-camera system, the mold from different angles to obtain three-dimensional coordinates of marking points and coding points on the overall outer surface of the rotating-body mold; (S3) rotating the mold, and repeatedly photographing the marking points and the coding points on the mold surface under different angle poses; and calculating three-dimensional coordinates of the marking points and the coding points; and (S4) predicting a point cloud data of the outer surface under different angle poses based on a conversion relationship among the marking points to analyze a deformation degree of the mold during a rotation process.
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公开(公告)号：US11941329B2
公开(公告)日：2024-03-26
申请号：US18313410
申请日：2023-05-08
发明人： Jun Wang , Tianchi Zhong , Zhongde Shan , Yuan Zhang , Kun Xiao
摘要： A method for analyzing fuselage profile based on measurement data of an aircraft, including: acquiring point-cloud data of an aircraft via a laser scanner; selecting point-cloud data of a fuselage component from the point-cloud data of the aircraft; based on a weighted locally optimal projection (WLOP) operator and Ll median curve-skeleton concept of point cloud, extracting a medial axis from the point-cloud data of the fuselage component; uniformly sampling the medial axis into a plurality of skeleton points; extracting a discrete point set of a cross-section contour of the fuselage component; performing circle fitting on the discrete point set to obtain a fitted circle and parameters thereof; calculating a deformation displacement measurement indicator μ of the cross-section of the fuselage component to evaluate cross-section contour of the fuselage.
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公开(公告)号：US11911961B1
公开(公告)日：2024-02-27
申请号：US18242529
申请日：2023-09-06
发明人： Zhongde Shan , Congze Fan , Jinghua Zheng , Wenzhe Song , Yiwei Chen , Kai Liu
IPC分类号： B29C64/218 , B29C64/236 , B29C64/295 , B29L31/30 , B33Y30/00 , B33Y80/00
CPC分类号： B29C64/218 , B29C64/236 , B29C64/295 , B29L2031/3097 , B33Y30/00 , B33Y80/00
摘要： An additive manufacturing device for an aerospace truss includes a raw material input unit, a longitudinal beam forming unit, a longitudinal beam traction unit, a cross beam forming unit and a truss support unit. The raw material input unit stores pre-impregnated wires and pre-impregnated tapes, and a motor drives rollers to convey the pre-impregnated wires and the pre-impregnated tapes forward; the longitudinal beam forming unit is composed of three sets of forming molds, and the pre-impregnated tapes form V-shaped longitudinal beams through heating molds; a stepper motor used in the longitudinal beam traction unit drives three sets of roller traction devices through steering gears to pull formed longitudinal beams; the cross beam forming unit is composed of a motion module and a printing module, and a truss cross beam is printed through a 3D printing method of molten deposition.
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公开(公告)号：US11591727B2
公开(公告)日：2023-02-28
申请号：US17707912
申请日：2022-03-29
发明人： Jun Wang , Zhongde Shan , Xiaokang Ma , Yaoyao Wang , Haoqin Yang
摘要： An automatic circumferential insertion apparatus and method for a complex rotary preform. The apparatus includes a double-hinge yarn carrier and a U-shaped bracket. Two ends of the double-hinge yarn carrier are respectively provided with a cylindrical hinge structure. One cylindrical hinge structure is in revolving pair connection with an outer clamping buckle at one end of the U-shaped bracket, and the other cylindrical hinge structure is in revolving pair connection with an inner clamping buckle at the other end of the U-shaped bracket. Two sides of the U-shaped bracket are provided with an electromagnet, respectively. The outer clamping buckle is provided with a pin, which is controlled by triggering, and is triggered simultaneously with the electromagnet at the side where the outer clamping buckle is arranged.
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公开(公告)号：US12011882B1
公开(公告)日：2024-06-18
申请号：US18520581
申请日：2023-11-28
发明人： Congze Fan , Wenzhe Song , Zhongde Shan , Yiwei Chen , Jinghua Zheng , Yaxing Song
IPC分类号： G06T15/00 , B29C64/393 , B33Y50/02 , G06F30/10 , G06F113/10
CPC分类号： B29C64/393 , B33Y50/02 , G06F30/10 , G06F2113/10
摘要： A path planning method based on dynamic contour offset discretization and for spatial curved-surface printing is provided. Firstly, transversal equal slicing is carried out on a target model, and single/double contours are labeled; secondly, central slicing is carried out on the model, curvature contours are discretized, feature values of contour offsets of slice layers are calculated on the basis of a surface contour curvature of the model, and dynamic offset filling for inner contours of horizontal slices is realized; then longitudinal equal slicing is carried out on the slices, and spatial discrete points of the target model are obtained; and finally, virtual double contours are constructed for the single contours, and labeling processing for the discrete points is carried out, so that a discretized three-dimensional spatial equidistant lattice of the target model is obtained.
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9.发明授权公开(公告)号：US11945026B1
公开(公告)日：2024-04-02
申请号：US18523890
申请日：2023-11-30
发明人： Zhongde Shan , Haoqin Yang , Jianpei Shi
摘要： A multi-path internal microporous efficient refrigeration method and device for a frozen sand mold is provided. The device includes a frozen sand molding chamber, an electric lifting platform, a teflon porous lining, a removable porous aluminum plate, a frozen sand mold refrigeration device box, a sealing cover plate, an ultrasonic piezoelectric sheet, a U-shaped condenser tube, an ultrasonic generator, and a low-temperature refrigeration system. The teflon lining and the removable porous aluminum plate are provided with through hole structures of the same size and shape for rapid cooling from the surface to core of molding sand. The lifting platform is opened and the bumpy-ridge teflon lining rises to a highest point to facilitate demolding. The high- and low-frequency dual mode of the ultrasonic piezoelectric sheet can be used for vibrating and compacting the frozen sand mold, and can also assist in cutting forming.
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10.发明授权公开(公告)号：US11926098B1
公开(公告)日：2024-03-12
申请号：US18243651
申请日：2023-09-07
发明人： Zhongde Shan , Congze Fan , Wenzhe Song , Yiwei Chen , Jinghua Zheng , Linlin Luo
IPC分类号： B29C64/321 , B29C64/118 , B33Y30/00
CPC分类号： B29C64/321 , B29C64/118 , B33Y30/00
摘要： A wire feeding mechanism suitable for fused deposition Additive Manufacturing (AM) of a flexible wire is provided, which includes a support housing. A melting nozzle is arranged at the lower end of the support housing, a hook is connected to the inner wall of the top end of the support housing, a connecting rod is connected to the inner wall of one side of the support housing, a wire drawing mechanism is connected to one end of the connecting rod, the wire drawing mechanism is located at the lower end of the hook, a limiting mechanism and a wire guide mechanism are connected to the inner wall of one side of the support housing, the limiting mechanism is located at the lower end of the wire drawing mechanism, the wire guide mechanism is located at the lower end of the limiting mechanism.
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