52results about How to "Eliminate pitting" patented technology

The invention discloses a vehicle body side outer plate drawing mold. The vehicle body side outer plate drawing mold comprises an upper mold body, a lower mold base and a convex mold, and further comprises a compensation blank holder arranged on the upper mold body, an inner blank holder movably arranged in the convex mold and matched with the compensation blank holder, and an outer blank holder movably arranged on the outer side of the convex mold and used for positioning a plate with the inner blank holder. The vehicle body side outer plate drawing mold is provided with the compensation blank holder for matching with the inner blank holder and the outer blank holder to control the inner blank holder and the outer blank holder to eliminate a depth section difference, so that the molding corrugation in closing of pressing material surfaces is eliminated, such defects as pits and collapse after molding of the plate are eliminated, and the drawing molding quality of a vehicle body side outer plate is improved. The invention further discloses a drawing method of the vehicle body side outer plate.

The invention relates to a construction method for an asphalt road surface of a road. The method is suitable for ensuring the quality and the longer service life of the road, and includes steps as follows: a pneumatic tyred roller is adopted for the initial rolling, namely, the pneumatic tyred roller follows a spreading machine closely to roll for 2-3 times, and during the rolling process, the temperature of the road surface is 120-150 degree C; and then a steel wheel roller is adopted for the final rolling after the first rolling. In order to prevent the asphalt from sticking onto the tyres, the temperature of the road surface is kept above 100 degree C during adopting pneumatic tyred roller to finish the initial rolling. As the temperature of the road surface during the initial rolling is higher, and the kneading amplitude of the tyres is larger, therefore, the weight of the adopted pneumatic tyred roller can be reduced appropriately, and the rolling time is only required for 2-3 times, in this way, the design requirement of the compactness of the road surface can be satisfied. The temperature determines the rolling quality of the road surface, and meanwhile, the asphalt in the material easily forms thicker sealing oil film layer, so that water, slurry and air can be prevent form entering, prevention of water damage to the road surface can be facilitated, and the durability of the road surface can be improved.

The invention discloses an ultra low temperature nitridizing method for a large ship engine cylinder sleeve, comprising the steps as follows: (1) towel is used to clean up the oil stain on a work piece; (2) the work piece is put into a clamping apparatus; (3) the work piece is put into a decontamination agent tank to carry out oil coating at the temperature of 75-95 DEG C for 5-8min; (4) the coated work piece is washed by running water; (5) the work piece is preheated at the temperature of 200-250 DEG C for 50-60min; (6) Na2SO4 with the weight of 8% is added into the nitridizing agent in the nitridizing furnace; the nitridizing temperature is 350 plus / minus 5 DEG C and the period is 2.5-3h; (7) the nitridized work piece is cooled in the air to below 150 DEG C; (8) the work piece is washed by running water; (9) the nitridized cylinder sleeve is checked; (10) the qualified cylinder sleeve is soaked into rust preventative oil; (11) the soaked cylinder sleeve is packaged and stored for transportation. The invention adopts ultral low temperature nitrogen treatment, so that the nitridizing period is shortened, the production cost is lowered, and the product quality is improved, thus being suitable for industrialized mass production.

The invention relates to a non-phosphorus corrosion and scale inhibitor suitable for medium-and-low-hardness and strong-corrosion water and application of the non-phosphorus corrosion and scale inhibitor. The non-phosphorus corrosion and scale inhibitor is prepared from the following ingredients by weight percent: 15-30% of an AMPS-containing terpolymer, 12-20% of hydrolyzed polymaleic acid, 0.1-10% of sodium gluconate, 15-40% of a fatty alcohol polyoxyalkylene alkyl ether-carboxyl-sulfopropionate copolymer, 0.1-3% of a pH regulator, 0.1-12% of zinc salt, 0.1-5.0% of benzotriazole, 0.5-5.0% of a water-soluble inert fluorescent tracer and 15-40% of deionized water. Compared with the prior art, the non-phosphorus corrosion and scale inhibitor provided by the invention solves the problem that a common non-phosphorus corrosion and scale inhibitor cannot draw the corrosion and scale inhibition function into consideration during concentration of a circulating water system. The non-phosphorus corrosion and scale inhibitor is favorable in performance and good in stability, has general applicability to medium-and-low-hardness and strong-corrosion water, and has the characteristics of no phosphorus, environmental friendliness and high efficiency.

The invention relates to a method for repairing the finish paint defects of a car, in particular to a method for repairing a finish paint shrinkage cavity of the car, which comprises the steps that: a. the shrinkage cavity is cleaned; b. varnish is injected into and fully fills a concave hole of the shrinkage cavity; c. the shrinkage cavity is dried and cured; d. after a paint film is cured, the shrinkage cavity is ground by sandpaper; and e. the shrinkage cavity is polished. Because the scheme is adopted, pits of the shrinkage cavity are fully eliminated, the repaired shrinkage cavity appears the color of the original paint which is consistent with that of the paint of other parts due to the transparency of the varnish, so that color difference is avoided, the appearance effect of the finish paint is not affected, the repairing procedures are simpler, the requirement on the level of an operator is not high, manpower and material cost is saved, and the working efficiency is improved.