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 road surface detection method and device, computer equipment and a storage medium. The method comprises the steps of acquiring ground point cloud of a to-be-detected road surface; constructing a grid map according to the ground point cloud, and determining two-dimensional ground points covered by each grid in the grid map; and obtaining the height value of the two-dimensional ground point covered by each grid, and determining the flatness of the pavement to be detected according to the height value of the two-dimensional ground point covered by each grid. By the adoption of the method, pavement detection with higher precision can be achieved.

The invention discloses a machining technology for a cold saw blade. The machining technology comprise the following steps that S1, a plate is cut, wherein the plate is cut to obtain a circular saw blade base body with sawteeth; S2, burrs on the surface of the saw blade base body are removed, wherein firstly, the surface of the saw blade base body is de-burred manually by using an angle grinder, and after the relatively large burrs on the surface of the saw blade are removed, a full-automatic de-burring machine is used for carrying out de-burring on the saw blade base body again; and S3, tempering is carried out on the saw blade base body, wherein the saw blade base body undergoes tempering and de-stressing heat treatment, the tempering temperature is 360 DEG C, the tempering time is 4 hours, and the tempering cooling time is 60-72 hours. According to the machining technology, the technological steps are simple, repeated de-burring and cleaning are carried out, the cleanliness degree of the saw blade can be guaranteed during grinding each time, the flatness precision of the saw blade can be improved, through the special angle design of a tool bit, the precision is higher when a workpiece is cut, and the yield of the cold saw blade is improved.

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 provides a radar reflecting surface system and a leveling method and a building method thereof. A radar reflecting surface is manufactured by adopting a whole plate. The manufactured radar reflecting surface is installed on a supporting frame, and the radar reflecting surface is divided into a plurality of sub-reflecting surfaces by the supporting frame. A first adjustment point forcontrolling the edge area and a second adjustment point for controlling the center area are set for each sub-reflecting surface. The acting force borne by each adjustment point on each sub-reflectingsurface is comprehensively controlled in an iterative mode, and local flatness adjustment of the radar reflecting surface is realized. Finally, adjustment of the overall flatness of the radar reflection surface is completed.

The invention provides a method for determining wafer processing parameters and a wafer processing method. The method for determining the wafer processing parameters comprises the following steps: acquiring flatness data of predetermined lines on a plurality of wafers in a wafer processing procedure; determining radial data of the predetermined lines according to the flatness data of the predetermined lines; and determining the silicon wafer processing parameters according to the radial data of the predetermined lines of the plurality of wafers. According to the method, the parameters of the next batch of silicon rods or the subsequent processing procedure of wafers can be determined according to the processing data of the previous batch of silicon rods, so the flatness precision of obtained wafers is higher, processing yield is higher, and cost can be reduced.

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 belongs to a friction reduction vibration isolation technology and relates to a sliding liner plate apparatus used in installation bracket of an avionic device. The sliding liner plate apparatus comprises: a sliding gasket, a double-sided glue film, a supporting plate, a front fixed block, a rear fixed block, a fixed screw and a rear supported plate. By using the apparatus, a pushing force needed during electronic equipment is pushed into the installation bracket can be reduced. A surface treatment result of a cabinet bottom and a supporting plate surface which are contacted during the mutual sliding of the electronic equipment can not be damaged. Buffering and isolation effects can be achieved when the electronic equipment is impacted and vibrates. By using the apparatus, rapid loading and unloading of the avionic device can be guaranteed.

The invention discloses a novel airport fabricated pavement flexible transition layer system and method, and relates to the field of fabricated airport pavements. A sealing layer and a flexible coiled material are spread on the top surface of a court road base layer, the flexible coiled material is mechanically paved, and further the top surface of the court road base layer is leveled through professional spreading equipment, and a coiled material bonding surface is provided; and the laying and pasting of the coiled material are conducted at the same time through laying and pasting professional equipment, and the top face is further leveled. According to the flexible transition layer system and the method, the flatness of the top surface of the court road base layer is further improved, the waterproof performance of the pavement is improved, the seal coat protects the base layer and is free of laying of coiled materials, and the laying and bonding efficiency of the coiled materials is improved; and meanwhile, hard contact between prefabricated plates on the coiled materials and the base layer is avoided through the coiled materials, the stress concentration at the bottom of the plate is reduced, the stress state of the bottom of a prefabricated pavement plate is improved, and the stability of the fabricated pavement is further improved.

The invention discloses a high-flatness printed circuit board (PCB) embedded with ceramic blocks and a preparation process thereof, the high-flatness PCB embedded with ceramic blocks comprises a PCB body, the PCB body comprises a conventional steel plate, a release film, a PCB layer and a release steel plate which are laminated from top to bottom; the PCB layer comprises a first circuit layer, a first core layer, a second circuit layer, a PP bonding layer, a third circuit layer, a second core layer and a fourth circuit layer which are formed by hot melting from top to bottom; the middle part of the PCB layer is provided with an empty groove used for installing a ceramic block. And the empty slot penetrates through the first circuit layer, the first core layer, the second circuit layer, the PP bonding layer, the third circuit layer, the second core layer and the fourth circuit layer. When the PCB body is pressed, the ceramic block is in direct contact with the release steel plate, so that the high flatness precision of the ceramic block and the surface of the PCB layer is within +/-5 microns, and meanwhile, the preparation process is simple, the manufacturing cost is relatively low, and the PCB is suitable for large-scale production.

The invention discloses a preparing method of a whole welding type guide rail. The whole welding type guide rail serves as a motion basis of a certain large rotation device, and has the advantages ofbeing large in diameter, high in precision and stability and the like. The basis problems about high-precision motion and precision positioning of the certain large rotation device can be solved, a main structure is formed through whole welding of multiple segments of single-rail parts, and the design and manufacturing process comprises the six steps of single-rail part design, welding groove design, single-rail part manufacturing, guide rail mounting, guide rail welding, U-shaped welding line grinding and the like. Guide rail mounting and guide rail welding serve as key processes, and the method has the important significance in ensuring precision and stability of the whole guide rail.