4results about How to "No surface defects" patented technology

The invention discloses a grinding-free high-chromium ultra-pure ferritic stainless steel cold-rolled sheet production method which comprises the following steps: raw material annealing and pickling: after a shot blasting procedure and a sulfuric acid pickling procedure of the raw material annealing and pickling, respectively using a heavy brush to brush iron scales on the surface of the raw material, controlling the rotating speed of the heavy brush to be 500-750rpm, controlling the power to be 50-70KW, and controlling the reduction ratio to be greater than or equal to 20%; during cold rolling, the roughness and deformation of a roller are controlled, specifically, in the first pass of cold rolling, the roughness of the roller is 0.8-1.0 mu m, and the deformation is controlled to be 22-25%; from the second pass of cold rolling to the pass before a finished product, the roughness of a roller is 0.2-0.4 mu m, and the deformation is controlled to be 13-20%; and in the finished product pass of cold rolling, the roughness of the roller is 0.1-0.2 mu m, and the deformation is controlled to be 10-20%. According to the method, the surface quality of the high-chromium ultra-pure ferrite stainless steel cold-rolled sheet is ensured, the coping procedure can be omitted, a hot coil is free of coping, the production efficiency and the yield are improved, the manufacturing cost is reduced, and the economical efficiency and competitiveness of products are effectively improved.

The invention relates to the technical field of square billet bulging treatment, in particular to a high-pulling-speed square billet secondary cooling water distribution method and system.The method comprises the steps that water pipelines are arranged on the left side, the right side, the inner arc and the outer arc of a square billet respectively, and the water pipelines on the left side and the right side are combined; a cooling area where the square billet passes through is divided into five parts, the water flow of the inner arc pipeline serves as the reference, and the water flow ratio of the inner arc pipeline to the outer arc pipeline of each cooling area, the water flow ratio of the inner arc pipeline to the combined pipelines on the two sides and the total flow of each cooling area are set; and the bulging amount of the square billet at different pulling speeds is smaller than a set threshold value. By controlling the water flow ratio of the square billet in the inner arcs to the outer arcs and the inner arcs to the sides of the five cooling areas and the total water flow of the five cooling areas, the bulging problem of the square billet is solved.

The present invention discloses a preparation method for improving the thickness uniformity of molybdenum thin plates, belonging to the technical field of molybdenum thin plate preparation methods. The preparation method includes: setting two rollers with the same crown and both satisfying 1 / 15000 < tanθ < 1 / 9000 as the upper and lower rollers of a cold rolling mill, where tanθ represents the ratio of the difference d between the diameter at the center of the roll body and the diameter at the edge of the roll body to half of the roll length L / 2; adjusting the bending force and rotational speed of the cold rolling mill until its pressure gauge reaches 6 - 8 MPa, and rolling the cold-rolled semi-finished molybdenum plate through the adjusted cold rolling mill to obtain the finished molybdenum thin plate. The present invention can improve the thickness uniformity of molybdenum thin plates and reduce their surface defects under the condition of not changing the rolling process by coordinately adjusting the bending force of the rolling mill and the crown of the rollers, so as to meet the high-end application requirements.

The present application belongs to the technical field of printing materials, and particularly relates to a UV photocuring ink for silk screen printing of explosion-proof lines and a preparation method thereof. The ink takes epoxy acrylate resin as a main film-forming material, takes tripropylene glycol diacrylate as a flexible dilution monomer, cooperates with trimethylolpropane triacrylate as a rigid crosslinking monomer, takes 4-ethoxybenzophenone as a long-wavelength absorption type photoinitiator, and adds a composite additive compounded by a leveling agent, a defoaming agent and an antistatic agent in a specific proportion. The specific proportion of the bifunctional monomer and the trifunctional monomer constructs a network structure with a flexible main chain and moderate crosslinking, and the synergistic effect of the composite additive makes the cured coating have excellent bending flexibility while maintaining a high crosslinking density and surface hardness, has strong adhesion to paper fibers, has good fine line printing leveling, and has an antistatic function, which can effectively solve the problem of explosion lines at the folding part of paper packaging, and is suitable for explosion-proof line printing of various paper product packaging.