32results about How to "High flatness precision" patented technology

An optical element includes a light guide plate that has therein a light transmissive flat plate member on which a transflective layer is formed, and a layer of a light transmissive adhesive or a light transmissive resin layer that uniformly covers the light guide plate. The refractive index of the layer of the adhesive or the resin layer is set to a refractive index different from that of the light guide plate. A first surface of the layer of the adhesive or the resin layer that is on the light exit surface side of the light guide plate is kept parallel with a second surface of the layer of the adhesive or the resin layer that is on the opposite side to the light exit surface side of the light guide plate.

The invention relates to a vacuum suction table of a double-layer structure. The vacuum suction table comprises a frame, a bottom plate, a panel and honeycomb cores; the bottom plate is provided with bottom plate suction openings and the panel is covered with small adsorption holes; the vacuum suction table is characterized in that the inner region of the frame includes air duct regions and installation regions, the air duct regions and the installation regions are independent mutually, the air duct regions are internally provided with air duct suction openings which are communicated with the bottom plate suction openings in a one-to-one correspondence mode, the installation regions correspond to the honeycomb cores one to one, and the frame is filled with corrugated cores located above the honeycomb cores, each corrugated core includes an upper end face, a lower end face and supporting connection faces, each upper end face is combined with the supporting connection faces located at the two sides of the upper end face to form an aeration area which is communicated with the corresponding air duct region, the upper end faces are connected with the panel and provided with small air holes A which are communicated with the small adsorption holes in a one-to-one correspondence mode, a part of lower end faces are in connection with the corresponding honeycomb cores in a covering mode, and the other part of the lower end faces are connected with the corresponding air duct regions. The vacuum suction table is high in strength, internal gas paths are small in windage resistance, energy loss is low, and adsorption force is large and uniform.

The invention discloses a method for milling a precise cavity plane of a thin-wall aluminum-magnesium cartridge receiver of an aircraft engine. The method comprises the following steps: (a) selecting a diamond material and a milling blade with a smoothening edge, so that the plane cutting speed is increased, and the cutting efficiency is improved; (b) polishing the smoothening edge of the milling blade to form an angle alpha with a machined surface on the machined thin-wall aluminum-magnesium cartridge receiver; (c) optimizing milling machining parameters according to the milling blade and the smoothening edge of the milling blade; (d) fixing the machined thin-wall aluminum-magnesium cartridge receiver in a point supporting manner; and (e) carrying out surface milling machining on the precise cavity plane of the fixed machined thin-wall aluminum-magnesium cartridge receiver by virtue of the optimized milling machining parameters, so as to obtain the formed precise cavity plane of the thin-wall aluminum-magnesium cartridge receiver. According to the method, the plane cutting speed can be increased, the cutting efficiency can be improved, meanwhile, the cutting force can be decreased, and the friction between a cutter and machined parts is reduced, so that the vibration, cutter relieving and deformation of the plane in the machining cutting can be reduced, and finally the precision requirement of a big plane is guaranteed.

The present application relates to a road surface detection method, device, computer equipment and storage medium. The method includes: acquiring a ground point cloud of the road surface to be detected; constructing a grid map according to the ground point cloud, determining the two-dimensional ground points covered by each grid in the grid map; acquiring the ground point cloud of each grid The height value of the two-dimensional ground points covered by each grid, and the flatness of the road surface to be detected is determined according to the height value of the two-dimensional ground points covered by each grid. By adopting the method, road surface detection with higher precision can be realized.

The invention discloses an ultra-long guide rail for a three-coordinate measuring machine. The ultra-long guide rail comprises branch guide rails and front and rear bases for the branch guide rails, wherein four bolt holes for arranging full-thread screws are formed in a lower bottom plate of each of the front and rear bases, and threaded holes are formed in vertical plates and upper bottom plates of the front and rear bases; an elastic adjusting bolt is arranged in one threaded hole of each vertical plate, and rigid adjusting bolts are arranged in the other threaded holes of each vertical plate; a square hole is formed in each of the two ends of each of main and auxiliary lateral surfaces of each branch guide rail, and a pair of stepped holes communicated with the corresponding square holes is formed in each of the front and rear end faces of each branch guide rail; springs are arranged in the stepped holes of the spliced end faces; the full-thread screws penetrate through the springs in the stepped holes; the two ends of the full-thread screws are positioned in the corresponding square holes respectively, and are locked by nuts. The ultra-long guide rail is high in planeness accuracy, straightness and splicing seam bonding accuracy, strong in splicing seam bonding strength, small in bonding seam thickness, simple in structure, easy to assemble, free of maintenance and low in cost, influence on accuracy when air bearings pass through bonding seams is avoided, and the accuracy, comprising the planeness and the straightness, of the guide rail is kept unchanged when temperature is changed.

The invention belongs to a multi-functional aluminum and aluminum alloy plate full-width hydraulic leveling machine. The machine comprises a drive motor, a speed changer (2), a hydraulic station (14) and an operation table (11), wherein the drive motor and the speed changer (2) are connected with gantry wheels (15); the gantry wheels (15) are arranged at the lower end of a traveler gantry (4) and is in movable contact with a working table (1); the upper plane of the working table (1) is provided with a plurality of groups of movable anvil block components (5); the right end of each movable anvil block component (5) is provided with a movable anvil block drive device (13); the upper plane of the working table (1) is also provided with a plurality of hydraulic supporting plate oil cylinders (3); a hydraulic station (8) is arranged in the middle of an upper cross beam of the traveler gantry (4); pressing head movable motor driving mechanisms (7) are arranged on the two sides of the hydraulic station (8); pressing heads (6) are arranged on the lower sides of the pressing head movable motor driving mechanisms (7); a displacement sensor (9) is arranged on the right side of the pressing heads (6). The machine has the advantages of compact structure, low investment, high flatness accuracy and more functions.