Preparation method of high-heat-conductivity high-collapsibility oil tube core

Abstract

The invention relates to a preparation method of a high-heat-conductivity high-collapsibility oil tube core, which comprises the following steps: preparing coated metal particles from the base material high-heat-conductivity metal pellets in combination with phenolic resin, curing agent, lubricant and collapsing agent according to the following steps: heating the metal pellets to 150-160 DEG C, uniformly mixing and stirring the thermoplastic phenolic resin, curing agent, lubricant and collapsing agent, cooling, crushing and screening; and preparing the high-heat-conductivity high-collapsibility oil tube core on a core shooter by a hot box process, wherein the heating temperature is 200-230 DEG C, the curing time is 60-90 seconds, and the metal pellets are steel shots, iron shots or stainless steel shots. The invention can be used for casting a complex casting with an oil tube or elongated inner cavity, and has the advantages of favorable core collapsibility, great cleaning convenience, favorable surface smoothness of the casting tube wall, high density, high air tightness and favorable hydraulic resistance; and the energy consumption of the matched parts is lowered, and the service life is prolonged.

Description

Technical field: [0001] The invention relates to the field of casting technology, and in particular provides a method for preparing a high heat transfer and high collapse oil pipe core. Background technique: [0002] In the existing technology, with the development of the manufacturing industry, the lightweight, integrated, and precise castings have gradually become a trend, especially aluminum alloy and magnesium alloy castings such as casings, pump bodies, and shells on aero-engines. Because of its complex structure, there are often oil pipes or slender inner cavities inside, and there are pressure-resistant requirements for cast oil pipes and slender inner cavities, which must withstand certain air pressure or hydraulic pressure without leakage. For the molding of oil pipes or elongated inner chambers of such aluminum and magnesium alloy castings, sand cores are generally used at present, and the sand cores are cleaned after castings are poured. [0003] In recent years,...

AI Technical Summary

Problems solved by technology

Using the sand cores prepared by the current method, my country has successfully developed some aerospace aluminum and magnesium alloy castings with complex structures and slender and curved oil pipes inside, but some problems have also appeared in the development and production process, such as the sand core of the castings after pouring. Cleaning is more difficult (especially for magnesium alloy castings, such as a magnesium alloy shell casting of an aircraft engine, which contains slender and curved oil pipes. The castings are required to be delivered in T1 state, and high-temperature treatment is not allowed, so high-temperature sand cleaning cannot be used when cleaning sand cores. Sand or water blasting to clean the sand, and for the conventional film-coated sand core, it is difficult to clean it with mechanical methods such as vibration and high-pressure water after pouring). In addition, when the casting oil pipe is subjected to pneumatic and hydraulic tests, the pipe wall often leaks

The emergence of the above problems has led to low casting production efficiency, long cycle time, high cost, large amount of repairs, and low pass rate, which seriously affects the localization process and supporting needs of my country's aviation complex aluminum and magnesium alloy castings.

In order to solve the difficulty in sand cleaning of the sand core and the hydraulic leakage caused by the non-compact wall structure of the oil pipe in the casting, it is necessary to find a core preparation method with good heat transfer, large heat storage and good collapsibility

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