31results about How to "Good Phosphate Film" patented technology

The invention discloses a method for machining a T-shaped bolt. The method comprises the following steps of: a) casting a T-shaped rod material blank and controlling the weight percentage of all chemical components of the rod material blank to ensure that the rod material blank comprises 0.28 to 0.35 percent of C, 0.25 to 0.35 percent of Mn, 0.05 to 0.09 percent of V, 0.15 to 0.35 percent of Si, 0.01 to 0.04 percent of W, less than or equal to 0.025 percent of P, less than or equal to 0.035 percent of S, 0.55 to 1.20 percent of Ni, 0.35 to 0.45 percent of Co, 0.20 to 0.30 percent of Sb and less than or equal to 0.20 percent of Cu; according to the method for machining the T-shaped bolt, the bolt is machined by a cold extruding process, so that the intensity of the bolt is improved, the hardness value and the intensity value required by a 12.9 high-intensity bolt can be acquired, and the delayed fracture and the fatigue crack of the bolt under high intensity can be avoided; and during use, the bolt is reliable in connection, is not prone to break, and meets the using requirements of all industries in society on the high-intensity bolt; and the service life of the bolt is prolonged.

The invention discloses a method for manufacturing an abrasion-resistant U-shaped bolt. Machining steps include: casting a U-shaped rod, by weight, adding 11-14 parts of scrap steel into a medium frequency furnace to melt to form molten steel, adding carburant, when the temperature in the medium frequency furnace rises to 1120-1220 DEG C, adding 0.1-0.2 part of molybdenum, 0.2-0.3 part of magnesium ingot, 5-7 parts of scrap aluminum, 32-34 parts of steel ingot, 30-35 parts of pig iron and 12-16 parts of foundry returns, simultaneously scattering a layer of heat preservation covering agent on the surface of the melt and covering, slagging, after slagging, adding 0.6-0.9 part of ferromanganese and 2-3 parts of ferrosilicon alloy, when the temperature in the medium frequency furnace rises to 1400 DEG C, withdrawing, adding 0.4-0.6 part of copper along with molten iron into a ladle, and casting. The method adopts cold extrusion process to machine the bolt, the strength of the bolt is improved, hardness and strength required by the 12.9 high-strength bolt are met, and delayed fracture and fatigue fracture of the bolt under high strength are avoided. The bolt is reliable in connection and not prone to break, prolongs service life, and meets use requirements of various industries in society for the high-strength bolt.

The invention discloses a forging method for a foundation bolt. The forging method comprises the following forging steps of: a, preparing rod blanks by a forging process, controlling the chemical components of the rod blanks to satisfy the following requirements in percentage by weight: 0.25%-0.35% of C, 0.15%-0.25% of Mn, 0.15%-0.35% of Si, 0.01%-0.04% of W, P being not less than 0.015% and not more than 0.025%, S being not less than 0.015% and not more than 0.035%, 0.15%-0.20% of Ni, 0.025%-0.045% of Zn, 0.02%-0.03% of Sn, not more than 0.02% o Cr, and the balance of iron. According to the forging method for the foundation bolt disclosed by the invention, the bolt is machined by adopting a cold extrusion process, the strength of the bolt is improved, the needed hardness value and strength value of the 12.9 high-strength bolt are achieved, and delayed fracture and fatigue fracture of the high-strength bolt are solved; and moreover, during the using process, the foundation bolt is reliable in connection and not easy to break, so that the service life of the bolt is prolonged, and the using needs of the high-strength bolt in various industries of the society are satisfied.

The invention discloses a method for forging a high-strength bolt. The method comprises the following steps of: a, manufacturing a rod blank through a casting process, and controlling the weight percentage of each chemical component of the rod blank to meet the following requirements: 0.28 to 0.35 percent of C, 0.15 to 0.25 percent of Mn, 0.15 to 0.35 percent of Si, 0.01 to 0.04 percent of W, more than or equal to 0.015 and less than or equal to 0.025 percent of P, more than or equal to 0.015 and less than or equal to 0.035 percent of S, 0.15 to 0.20 percent of Ni, 0.025 to 0.045 percent of Ba, 0.02 to 0.03 percent of Sn, less than or equal to 0.02 percent of Mg and the balance of iron; and b, forging a cast rod at the temperature of between 630 and 680 DEG C for not more than 25 times, wherein a thin layer of graphite powder is coated on the inner wall of an impression of a forging die, and the granularity of the graphite powder is controlled to be 200 to 300 meshes; and turning an external thread of the bolt by using a precision lathe after forging. According to the method for forging the high-strength bolt, the bolt is machined by adopting a cold extrusion process, so that the strength of the bolt is improved, the hardness value and the strength value required by the 12.9 high-strength bolt are achieved, the problems of delayed fracture and fatigue fracture of the bolt under high strength are solved, the bolt is reliable in connection during use and difficult to break, the service life of the bolt is prolonged, and the using requirement of each industry in the society for the high-strength bolt is met.