52results about How to "Geometrically accurate" patented technology

The invention discloses an arc additive manufacturing finite element modeling method. The method comprises the following steps of: calculating an arc shape and determining the width of an additive area birth-death element; calculating a molten drop shape and determining the height of the additive area birth-death element; establishing an arc additive manufacturing finite element geometric model according to the width of the additive area birth-death element and the height of the additive area birth-death element; correcting the arc shape and the molten drop shape through verifying the temperature distribution of the arc additive manufacturing finite element geometric model, so as to correct the arc additive manufacturing finite element geometric model. According to the method disclosed by the invention, the geometric size of the additive area birth-death element can be determined before the arc additive manufacturing finite modeling by adopting an arc additive manufacturing simulation process, combining an arc shape simulation technology, a molten drop shape simulation technology and a finite element simulation technology and carrying out experimental verification, so as to realize the correct calculation of arc additive manufacturing finite element simulation.

The invention relates to a construction technology of a heavy haul railway, specifically relates to a construction method of ballastless tracks of a tunnel group of a heavy haul railway. According tothe characteristics of high requirement on the construction precision of a ballastless track bed and difficulty in control in the construction of the ballastless tracks, the principle of near laying and convenience in precision control is adopted; a double-block sleeper is hung and placed to a position to be laid near a construction track bed plate; after key processes of steel bar binding, trackpanel assembly, comprehensive grounding, track coarse adjustment and the like are carried out, the geometric dimension of the tracks is finely adjusted by using a track inspection trolley measuring system, so that the design precision requirement is met, and finally, the track bed concrete is poured for one-step forming. The technology has the characteristics of being simple and convenient to operate, safe, practical, accurate in track geometric dimension, quick to position and the like.

The invention discloses a mature pomegranate positioning method based on Mask R-CNN and three-dimensional sphere fitting, and relates to the field of fruit picking and positioning of agricultural robots. Rapid and accurate positioning of fruits is the premise of accurate picking of the picking robot. According to the method, a pomegranate color image RGB and a depth image D are acquired by adopting Kinect V2.0, the acquired color image RGB is rapidly positioned to the picture position of a mature pomegranate by adopting Mask R-CNN, then a corresponding depth picture is segmented according to the RGB picture of the mature pomegranate, and three-dimensional point cloud reconstruction is performed by adopting camera calibration parameters and a rotation matrix; finally, the mature pomegranatepoint cloud is complemented for the single mature pomegranate point cloud data by adopting a mode of fitting a sphere based on a least square algorithm to obtain complete mature pomegranate point cloud data, and a target pomegranate is positioned. According to the method, the mature pomegranate is positioned by integrating the color image RGB and the depth image D, the defect that the actual sizeof the fruit is difficult to obtain only by using an RGB image positioning method is overcome, the complex matching process of multi-azimuth point cloud data fusion is also overcome, and the real-time performance and the precision of fruit positioning are greatly improved.

The invention discloses an imaging detection system and method, and aims to solve the problems that an imaging area lacks matching characteristics and needs more than two times of imaging for effective coverage, and geometric parameters of flaws, defects and other diseases in an image need to be accurately measured. A background conformation device generates a laser background pattern and projectsthe background pattern to an imaging detection area. An imaging device is composed of a camera and a corrected pattern projection device. The imaging device acquires a target image having a correctedpattern and a background pattern. When one background conformation device cannot cover the imaging detection area, a plurality of background conformation devices are used for projecting background patterns, the background patterns projected by the plurality of background conformation devices are overlapped in the imaging area, and the space combination relation of the background patterns formed by the plurality of background conformation devices is not changed in the imaging process. Image geometric correction processing is completed according to the corrected pattern projected by the imagingdevice, and multi-image mosaic matching is completed based on the background pattern.

The invention discloses a staircase shaping support formwork mainly comprising at least two support rods (2) and a plurality of shaping plates (3), wherein the support rods (2) are arranged along the trend of a staircase (1) and positioned above the staircase (1); the plurality of shaping plates (3) respectively support against the stepping surfaces of the staircase (1); the support rods (2) are fixed together through tightening rods (7) to form a staircase shaping support frame; transverse ejector rods (4) corresponding to the shaping plates (3) are arranged below the support rods (2); one ends of the transverse ejector rods (4) are fixed on the support rods (2), and the other ends of the transverse ejector rods (4) support against the shaping plates (3). The invention has the advantagesof safety, simpleness, high shaping quality, construction progress acceleration and material wastage reduction.

The steel tube cold radius fixing comprises the procedures of selecting material with the outer radius of the material bigger than the upper limit of the standard, composed of the design, adjustment and radius calibration of the rolling hole, inspection, cutting and final product delivery. It completely solves the difficulty of low yield rate of oil sleeve tube. It is simple, high in productivity, adjusted by corresponding roller, relying on the hydraulic pushing force to form the rolling hole, to get to the shrink of radius, calibrating circle, and rectifying the tube with quick operation. It is energy economical. It requires small investment and land occupation, free from heating furnace and cold bed. The yield rate is high, precise in adjustment dimension, free from influence of thermal expansion.

The invention discloses a method for manufacturing an X 90 grade pipeline steel large-diameter thick-wall spiral submerged-arc welding pipe. The method comprises the following working procedures: uncoiling, flattening, edge milling, forming, welding, pipe end expanding, X-ray continuous detection, static hydrostatic testing, weld joint and base metal ultrasonic flaw detection, pipe end chamfering, pipe end shooting and finished product inspection; the welding working procedure comprises inside and outside prewelding, finish inside and outside welding; through reasonably selecting welding parameters, a weld joint and base metal can transit smoothly to reduce or eliminate undercut, and the weld joint has excellent mechanical property and ensures obdurability match of the welding pipe and a welded joint; while the pipe end expanding working procedure is carried out, an automatic spiral submerged-arc welding pipe perimeter measuring device is adopted to measure the perimeter in real time, so that real-time measurement and monitoring on the welding pipe perimeter during the forming process are realized, and precise geometric dimensioning of the welding pipe is ensured.

The invention discloses a method and device for detecting a character size. The method comprises the steps: acquiring 3D contour data of the surface of an engraved code character; calculating data ofa geometric surface on which the character is located from the contour data; extracting point cloud data of an engraved character with depth or height information; extracting a single character and carrying out statistics of the geometric size of each character; and outputting a result. Besides, the device includes a 3D contour measuring unit, a guide rail, a rail fixing unit base, a motor, a motor driving unit, a displacement sensor and a processing unit. According to the invention, with full-automatic detection of the depth or height of the engraved character, the character size and adjacentcharacter spacing, the manual testing costs of the motor vehicle VIN code, engine number and the like in the motor vehicle manufacturing and inspection fields can be reduced; the detection accuracy and detection efficiency can be improved; and thus the method and device for detecting a character size have the great significance in promoting the inspection automation in the industry.

The invention discloses a method of supporting a large-height shear wall form. According to the technical scheme, the method includes firstly, tying rebars on the lower three-meter portion of a shear wall, erecting a form, and pouring concrete; secondly, removing the form; thirdly, placing a scaffold plate 400*50mm on each triangular support, and erecting a 1100mm high guard rail on an inserting head of each triangular support through scaffold steel pipes; fourthly, attaching double-sided adhesive tape to the top of the existing shear wall, tightly attaching the form to the existing shear wall, and placing the lower portion of the form on the triangular supports; fifthly, repeating the steps for both sides, pouring the concrete, maintaining, and removing the form. The method has the advantages that stress performance is good, the rigidity and strength of the form are guaranteed, the form is safe and reliable, over-standard deformation under the constructional load action of poured concrete is avoided, and the geometry of the constructed concrete can be accurate.

The invention relates to a test mould for preparation of a shear thickening glue test piece and a using method thereof. The test mould comprises a base device, a test piece mould device and a test piece compaction device, wherein the base device comprises a base, a fixed slot, a buffer foam layer, a support frame, a cross beam and a threaded hole; the test piece mould device comprises an outer design finalizing cylinder and a jointable sheet-like cylinder; and the test piece compaction device comprises a screw, a piston type pressing plate and a handle. The test mould is capable of improving the compaction and moulding quality of the shear thickening glue test piece while simplifying the manufacturing process of the shear thickening glue test piece, and is suitable for the manufacturing ofthe shear thickening glue test piece for rheological test. On the basis of characteristics of shear thickening glue, the shearing speed is relatively low in the test piece preparation process, and the fluid state between shear thickening glue particles is lubricating contact and deformation is easy to occur, the jointable sheet-like cylinder overcomes the difficulty, solves the problem that the test pieces is easy to destroy when being directly taken during traditional test piece preparation, and a broad application prospect is provided in the aspect of preparing the shear thickening glue test piece in laboratories.

The invention relates to an inner support device of a basement precast slab mold and a construction method. The device is used for supporting between a first precast slab and a second precast slab oppositely arranged; the first precast slab and the second precast slab are vertically arranged on the edge of a basement cushion layer; and the inner support device of the basement precast slab mold comprises at least one first stand column vertically arranged in a basement and bonded on the first precast slab, at least one second stand column vertically arranged in the basement and bonded on the second precast slab, at least one first hinge piece fixed on the first stand column, at least one second hinge piece arranged corresponding to the first hinge piece and fixed on the second stand column, and at least one support pipe capable of adjusting the length, connected between the first hinge piece and the second hinge piece and supported between the first stand column and the second stand column. The device is convenient in disassembly and capable of recycling.

The invention relates to a brick reverse modeling auxiliary refractory material management method. Based on the reverse modeling technology, firstly, bricks are sequentially formed into a real-scene model according to the use position; and secondly, the real scene model with dense mesh surfaces is exported to 3ds Max in an obj format, and the model is cut into two-dimensional graphics, that is, the three-view drawing of the model reconstruction; brick family files are created through the three-view drawing and are loaded into the project for combination, to complete the coke oven masonry modelof each part, and matching board construction is performed for coke oven masonry according to the daily plan, personnel positioning, brick positioning, positioning boards, fixed-point masonry methodfor board allocation construction. The method of the invention adopts the reverse modeling technology, can precisely reduce the geometric size of the special-shaped brick of the coke oven, and provides the basis for the modeling of the brick; the real scene model with dense mesh surfaces is quickly cut in 3ds Max, the three-view drawing of the model is extracted, and then the three-view drawing isimported into CAD, and the brick solid model is drawn by software tools, which is conducive to the simplification of the model surface.

The present invention is injection process to produce ethyl acrylate copolymer pipe. AEM material is first made to enter the injector tube from the material pan and injected with the injecting plunger in the pressure of 150-180 bar and certain speed into the mold cavity at the upper and lower mold temperature controlled in 150-180 deg.c and material feeding section temperature and injecting section temperature controlled in 50-80 deg.c; and then sulfurized for 2-10 min. The said technological process can produce hard-to-produce corrugated pipe, and has simple technological process, simple operation, once injection, low labor strength, high mechanization and automation, high temperature and fast sulfurization of rubber product and short production period. The pipe product has homogeneous and stable physical and mechanical performance, precise sizes, high quality and less material loss.

The invention provides a method for preparing a concrete process tea ware through the reverse mold technology. The method comprises the following steps that (1) a mold frame capable of accommodating a tea ware original model is manufactured according to the tea ware original model such as a tea tray, a saucer, a tea hold, a tea pet and a tea holder; (2) a mold pouring material is blended; (3) the pre-blended mold pouring material is poured till overflows the top end of the mold frame by 1-5 cm, bubbles are removed, mold opening is conducted after the pouring material is hardened, the mold frame is taken out, and a tea ware mold is obtained; (4) a cement-based mixture is prepared, prepared cement concrete is poured into the tea ware mold, vibration is conducted so that all spaces can be sufficiently filled with the concrete, plastering and finishing are conducted, and a top mold body is covered; and (5) a cement tea ware is maintained in the mold, and a finished cement tea ware is obtained. According to the method, the cement concrete is applied to prepare the tea ware for the first time, the prepared cement tea ware is good in fragrance gathering effect, and the plain texture of the cement material is sufficiently achieved.

The invention relates to a casting mould of motor cam shaft made by metallic material and used to cast integral cam shaft. Material is copper alloy such as adnic alloy, chrome copper or copper-tungsten alloy with copper taking up 78-93% of gross weight. Compared with sand mold, it is convenient in modeling and removing from mould due to the low affinity between copper alloy and steel material. Copper alloy mould is equipped with coolant passage due to softening temperature of copper alloy being lower than that of feed liquid. The invention has the advantages of high-quality surface, accurate physical dimension and preferred physical-mechanical properties.