52results about How to "Improve quenching hardness" patented technology

The invention provides an austempered ductile iron adjusting chemical component. The chemical component uses Mn and Si as a base to substitute Mo and Ni, and contains a plurality of elements comprising Cu, B, Nb and Cr to realize low and micro alloying, so the respective effects of all elements are fully performed, the interactive effect promotion is realized, the hardenability is increased, the alloy consumption is reduced, and the cost is reduced. The invention also provides a new austempered ductile iron quenching technology matched with the austempered ductile iron. The technology is a step austempering technology using step quenching oil and an air isothermal furnace. The heat treatment of a workpiece through the technology realizes crystal grain refinement, good hardenability, high strength and toughness, low hardness (HB190-240) before the step austempering treatment, and good processing performances; and the obtained processed austempered ductile iron has a high hardness (HRC35-56) and extremely less oxidation and deformation, so the precision is guaranteed, and finishing treatments comprising grinding and the like are not needed. Compared with traditional nitrate bath austempering technologies, the austempered ductile iron quenching technology has the advantages of low cost, no generation of large amounts of harmful substances comprising nitrite or the like, low pollution and safety.

The invention belongs to the technical field of surface heat treatment, and particularly relates to a powder metallurgy automobile engine chain wheel lock pin hole laser quenching method. According to the method, the purpose of strengthening a component to be quenched is achieved by adopting gas blowing assistance and two-time un-equal speed scanning laser quenching. The two-time scanning speeds are inconsistent; the first scanning speed is low, the second scanning speed is high, and the power in the overall process is kept consistent; the gas flow is kept unchanged; during a quenching process, the gas is blown to a position of a chain wheel plane quenching light spot at a fixed angle at any time. According to the method, the properties, such as the hardness, the wear resistance, the fatigue resistance and the oxidation resistance, of a workpiece are improved, and the problems of low lock pin hole induction quenching hardness, quenching surface melting and the like are solved.

The invention discloses a heat shaping fixture and a heat shaping method in the quenching process of a metal material seal ring, and relates to a heat shaping fixture and a heat shaping method in the quenching process of a seal ring. The invention solves the problems that the integral hardness of a seal ring cannot be improved, the opening size cannot be ensured and waste products are easily produced in the conventional quenching technology. The device comprises that: an upper cover plate and a bottom plate are vertically aligned; a wedge block is nailed in an inclined hole of each shaft; the shaft is sleeved with number adjustable gaskets; the metal material seal ring is arranged between the upper cover plate and the bottom plate; an oil immersion hole on the upper cover plate corresponds to the upper end face of the metal material seal ring; and an oil immersion hole of a lower cover plate corresponds to the lower end face of the metal material seal ring. The method comprises the following steps of: clamping the seal ring in the heat shaping fixture; putting the seal ring and the heat shaping fixture into a heat treatment furnace, and completing quenching and tempering procedures of the heat treatment, which meet the hardness requirement; and detaching the heat shaping fixture and taking the seal ring out. The invention is used for heat shaping in the quenching process of the metal material seal ring.