Preparation technology of oil pipe for diesel engine

Abstract

The invention discloses a preparation technology of an oil pipe for a diesel engine. The preparation technology comprises the following steps: (1) putting 20 to 90 percent of pig iron, 2 to 16 percentof waste steel and 3 to 23 percent of foundry returns into an intermediate frequency furnace and smelting; raising the temperature to 1100 to 1650 DEG C; (2) standing for 12min at the temperature of1260 to 1820 DEG C; carrying out spheroidization treatment and first-time inoculation in a dam type spheroidized bag at 1126 to 1630 DEG C; controlling the content of a spheroidization agent to be 3 to 6 percent of the weight of molten iron and controlling the content of a first-time inoculation agent to be 1 to 1.8 percent of the total weight of the molten iron; (3) carrying out stream second-time inoculation when the molten iron flows out, wherein the amount of a second-time inoculation agent is 1 to 2 percent of the total weight of the molten iron; and (4) pouring the molten iron into a pouring cup filled with an instantaneous inoculation agent and carrying out third-time inoculation. According to the preparation technology disclosed by the invention, the problem that mold sand in the pipe is sintered and iron burnt-on sand on an inner wall of the pipe cannot be cleaned is solved through design methods including utilization of a heat-resisting coating of a water pipe and heat-resisting sand, baking at certain temperature and in certain time and the like.

Description

technical field [0001] The invention relates to the technical field of mechanical equipment, in particular to a preparation process of an oil pipe for a diesel engine. Background technique [0002] Large diesel engines are mainly used in the shipbuilding industry as the main power of ships. With the rapid development of the nuclear power field in recent years, the demand for large diesel engines for emergency power generation of nuclear power units has been strong. In addition, large diesel engines in overseas markets are used for land fixed power generation and mobile power generation. The demand is also increasing year by year. [0003] The casting technology of large-scale high-toughness diesel engine fuselage is very difficult, and requires high technology, raw materials, equipment and personnel. Diesel engine fuselages at home and abroad have always been produced in two forms: casting and welding, and welding of large diesel engine fuselages is more than casting. The ...

AI Technical Summary

Problems solved by technology

Such high low-temperature comprehensive performance is rarely achieved by domestic diesel engine manufacturers.