KR970061407A - Manufacturing method of engine tappet with excellent wear resistance - Google Patents

Abstract

The present invention relates to a method for manufacturing an engine tappet having excellent abrasion resistance, and in particular, a step of forming a summed material by mixing a binder material, carbide, nitride or boride into a press mold, and then firing firstly. Wow; Placing the first calcined forming summ material on the body of the tappet and sintering second to form a sintered layer on the tappet; The present invention relates to a method for manufacturing an engine tappet having excellent abrasion resistance, comprising: improving the resistance layer against surface pressure by hardening the surface of the sintered layer by rapid cooling while pressing the sintered layer of the tappet.

Description

Method for manufacturing tappet for wear-resistant heavy engine.

Since this is an open matter, no full text was included.

1 is a sectional view showing the main parts of a valve train in an OHC type large diesel engine.

Claims (10)

Mixing the binder material with carbides, nitrides or borides, forming a press mold into a summed material, and then firing firstly; Placing the first calcined forming summ material on the body of the tappet and sintering second to form a sintered layer on the tappet; Rapid cooling while pressurizing the sintered layer of the tippet while the sintered layer hardens the surface of Hv 800 or more by improving the resistance to the surface pressure action, the manufacturing method of the engine tappet, characterized in that excellent wear resistance. The method of claim 1, wherein the primary firing is performed at 400-550 ° C. 3. The method of claim 1, wherein the secondary sintering is heated at a temperature of 1200 ° C. or higher but the holding time is shortened to within 2 minutes, thereby maintaining the spherical shape of the hard particles in the sintered compact. The method of claim 1, wherein the secondary sintering uses high frequency induction heating, flame heating, plasma heating, or laser heating. The wearable engine tappet according to claim 1, wherein after the brazing alloy is applied to the interface to improve adhesion when the primary calcined body comes in contact with the body of the tappet, the second sintering is performed. Way. The method of claim 1, wherein the sintered layer of the tappet is heated to a predetermined temperature and pressurized while the surface of the sintered layer is contacted with a cooling plate on the surface of the sintered layer during the solidification process. 7. The cooling plate of claim 6, wherein the cooling plate is formed of a material having excellent heat conductivity or having a cooling water line, and has an adhesive property such as ceramics, summits, and Ni-P materials such as nitride, oxide, carbide, and boride on the surface thereof. A method for producing an engine tappet having excellent wear resistance, characterized in that the coating of this low material by chemical vapor deposition, physical vapor deposition, electroless plating or thermal spraying prevents adhesion upon contact with a hot tappet sintered layer. The method of claim 1, wherein the heating coil of the high frequency induction heating is made flat and at the same time the cooling water is circulated therein to finish the heating of the sintered layer of the tappet and the power is cut off so that the tappet is not heated anymore. A method for producing an engine tappet having excellent wear resistance, characterized by rapid cooling by pressurizing the bed. The method of claim 1, wherein the binder material is based on Ni or an alloy thereof, and if necessary, CrO ₂ 45.0%, MoO ₂ 35.0%, AlO ₂ 10.0%, CoO ₂ 10.0%, CuO ₂ A method for producing an engine tappet having excellent wear resistance, characterized in that it is added alone or in combination with 10.0%, and the rest is inevitably mixed with impurities. The method for manufacturing an engine tappet according to claim 1 or 9, wherein the binder material is 30 to 60% by an area fraction of the sintered body. ※ Note: The disclosure is based on the initial application.