63results about How to "Flat thickness" patented technology

The invention discloses a wear-resistant workpiece and a manufacturing method of a wear-resistant coating thereof. The preparation method of the wear-resistant coating comprises the following steps: forming a preparation piece according to the structure of a required wear-resistant workpiece; coating nickel on the surface of the preparation piece through a double-pulse method, thus forming a nickel-coated transition piece; and coating a hard chromium layer on the surface of the nickel-coated transition piece, thus forming the wear-resistant coating on the surface of the preparation piece. For the manufacturing method of the wear-resistant workpiece, a step of coating nickel on the surface of the workpiece through a double-pulse nickel coating method is added; and the double-pulse nickel coating method is characterized in that the magnitude of current or voltage is regulated by an external control means, the current is additionally controlled by controlling the pulse switch-on time, the pulse switch-off time, the pulse duty factor, the pulse current density and the like, and corresponding variables are changed to respectively achieve the effects of increasing the cathode current density, inhibiting the generation of side reaction, reducing the impurity content in the coating, improving the current distribution and the like, thus improving the quality of the coated nickel layer and prolonging the service life of the wear-resistant workpiece.

The invention relates to a method for performing a pull-off test on ultraviolet-aged asphalt and asphalt mortar. The method comprises the following specific steps: (1) thermally aging an asphalt and asphalt mortar sample; (2) performing ultraviolet aging on the asphalt and asphalt mortar sample; (3) performing the pull-off test by using a pull-off tester: selecting a square rock block as an aggregate, pouring the asphalt and asphalt mortar sample onto the surface of the square rock block, then placing a puller, and performing the pull-off test after the puller and the asphalt and asphalt mortar are adhered while standing. Compared with the prior art, the method has the advantages as follows: before the pull-off test, thermal aging and ultraviolet aging are performed first, thermal aging simulates the thermal aging process in the mixing, transporting and paving processes of the asphalt and asphalt mortar, ultraviolet aging simulates change of an asphalt pavement after actual irradiation and is closer to the actual situation, quantitative operation is achieved in each step, and accurate calculation and analysis can be performed to ensure the testing accuracy.

The invention belongs to the field of insulator composite anti-pollution flashover coating equipment and method, in particular to a centrifugal coating device and a coating method applied to insulatorcoating. The invention adopts the centrifugal coating method with the rotating coating reagent of the workpiece insulator stationary, the coating thickness is uniform, smooth, free of bubble, bump, hanging flow, concave mark and other defects, and the coating process is convenient to disassemble and assemble. Compared with the traditional way of spraying by manipulator, the safety is greatly improved, and the quality and efficiency of the finished product are significantly improved compared with the artificial dip coating. The device and the coating method of the invention are suitable for coating outer umbrella insulators (single umbrella, double umbrella or multiple umbrellas), column insulators and other insulators.

The invention provides a lamination forming device and a lamination forming method for forming intermediate lamination products into lamination forming products with even thickness. The invention comprises a laminating apparatus (1) for laminating the lamination part(A1) and the laminated part(A2) to form the intermediate lamination product(A3), a plane press (2) for flat forming the surface by pressing the intermediate lamination product(A3) at the predetermined temperature, and a conveying unit (3). The plane press (2) comprises a fixed template (20), a movable template (21) and a translation unit (23) with a guiding movable template (32) making the movable template (21) move straightly in the vertical direction of the opposite surface. The translation unit (23) comprises multiple ball spline shafts (24), a corner part equipped on the movable template (21) and ball spline cylinders (25) respectively inserted by ball spline shafts (24).

The invention discloses a composite flame-retardant paperboard and a preparation method thereof. The composite flame-retardant paperboard is characterized in that the structure sequentially comprises surface layers, secondary surface layers and a core part from exterior to center; the surface layers are 1-2 MP layers, the secondary surface layers are at least one CEM1 layer, the core part is at least one core layer, wherein each core layer is composed of 1-3 PP layers and 1-2 CEM1 layers. The composite flame-retardant paperboard has the very good tensile strength (133-140 MPa), vertical layer bending strength (257-267 MPa), relative electric mark index (larger than or equal to 400), arc resistance (124-128) and vertical layer electric strength (in normal oil, the pressure is quickly increased, and a 25-75-mm cylinder electrode is adopted), the combustibility is in a V-0 grade, and the property is good.

The invention relates to a production process of an elastic paperboard. Raw paperboards are selected and used, the water content thereof is controlled to be 8-9 percent, the raw paperboards are placed on a paper stacking rack, the layers of the raw paperboards are calculated according to the required thickness of the elastic paperboard, industrial adhesive is selected and used, the raw paperboards are uniformly coated with the adhesive on a gluing machine, the glued raw paperboards are laminated through a bonding machine and then are transversely cut into single paper in a paper cutting machine, the cut paperboards are manually stacked and sealed for curing and then are delivered to a calendering machine for calendering, the working pressure of the calendering machine is 40-50Mpa, the calendered products enter a microwave drying unit for drying, the running speed for drying is determined according to the thickness of the elastic paperboards, the drying temperature is 70-80 DEG C, the water content of the dried elastic paperboards is controlled to be 6-8 percent, then the dried elastic paperboards enter the calendering machine for calendering, the density is controlled to be 1.19-1.24g/cm<3>, the elastic paperboards are cut through the cutting machine according to required size of customers and then are inspected, and the products which are inspected as acceptable are packaged, weighted and then warehoused. The elastic paperboard produced by adopting the production process has the advantages that the surface is flat, the thickness is uniform, the thickness deviation of the same board is extremely small, the density is high, the elastic strength is high and the use effect is good.

The invention discloses a process method for automobile bottom plate powder coating. The process method comprises the following steps: preparing raw materials, uniformly mixing the raw materials, performing melting extrusion by using a double-screw extruder, and finally crushing and grinding so as to obtain a powder coating; performing sand blasting roughening on an automobile bottom plate, performing ejection degreasing cleaning, performing hot water cleaning treatment, and performing drying treatment; preheating the pretreated automobile bottom plate, and performing powder coating operation on the surface of the preheated automobile bottom plate by using an electrostatic spray gun in an electric field environment; and performing high-temperature curing on the coated automobile bottom plate, cooling, performing quality inspection, and packaging after qualification, thereby obtaining a coated automobile bottom plate. The process method disclosed by the invention is simple to operate, mild in curing condition and short in curing time, and an obtained coating film has good properties of corrosion resistance, rusting resistance, collision prevention, noise prevention, wearing resistance, impact resistance and the like, is high in strength, good in dispersibility and good in adhesion property, plays a good protection role on an automobile bottom plate, is capable of effectively prolonging the service life of the automobile bottom plate, and is worthy of popularization.