Cross wedge rolling type strain-induced semi-solid die forging process for high-pressure common rail pipe for internal combustion engine

Abstract

The invention provides a cross wedge rolling type strain-induced semi-solid die forging process for a high-pressure common rail pipe for an internal combustion engine. An alloy bar made of a 0Cr18Ni9 stainless steel material and used for forming the high-pressure common rail pipe is preheated and then subjected to cross edge rolling, and a cross wedge rolling distorted state blank is obtained; then the cross wedge rolling distorted state blank is subjected to secondary heating, and then a high-pressure common rail pipe semi-solid blank with certain solid phase components is obtained; and finally the high-pressure common rail pipe semi-solid blank is subjected to semi-solid die forming, and then a high-pressure common rail pipe formed part is obtained. The low forming pressure is obtained, the product quality is good, and the material utilization rate is high.

Description

technical field [0001] The invention relates to the technical field of manufacturing high-pressure common rail pipes for internal combustion engines, in particular to a cross-wedge rolling strain-induced semi-solid die forging process for high-pressure common rail pipes for internal combustion engines. Background technique [0002] In the early 1970s, researchers such as D.B.Spencer, a doctoral student at MIT in the United States, discovered the special mechanical behavior of metals during solidification, that is, semi-solid processing characteristics, when they concentrated on measuring the high-temperature viscosity of Sn-15%Pb alloys with self-made high-temperature viscosity. . The so-called semi-solid processing is to vigorously stir the metal from liquid to solid to break the dendrites, and obtain a solid-liquid mixed slurry in which certain solid components are evenly suspended in the liquid metal mother liquor, and has a certain The fluidity, and then the process tec...

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Problems solved by technology

[0004] Up to now, the structural parts of high-pressure common rail pipes are mainly made of 0Cr18Ni9 and 1Cr18Ni9Ti stainless steel. The manufacturing process mainly includes: (1) Casting and forming. The high-pressure common rail pipes formed by casting methods have coarse grains and uneven distribution of structures. Pores and shrinkage defects are prone to occur, resulting in poor mechanical properties and low strength of high-pressure common rail pipes

(2) Forging forming. This method has high strength, compact structure and good mechanical properties, but there are disadvantages of large design allowance, large forging forming force and large energy consumption during processing.

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