Method for forming Monel metal bar under vacuum state

Abstract

The invention relates to a method for forming a Monel metal bar, in particular to a method for forming the Monel metal bar under the vacuum state and belongs to the technical field of metal vacuum melting and vacuum casting forming. The method for forming the Monel metal bar under the vacuum state is characterized by the control over vacuum pouring and vacuum breaking, a conical ingot mold with a specific inclination is applied to the vacuum pouring, the ingot mold is made of high-temperature-resistant high-strength chromium-nickel (30% of chromium and 12% of nickel) nodular cast iron. According to the method for forming the Monel metal bar under the vacuum state, microcosmic defects of a cast ingot center are eliminated in the process of forming, the degree of smoothness of the surface of a cast ingot is improved, the yield of the cast ingot is increased by over 10%, and the synthesized mechanical properties are quite stable; the Monel metal bar is applied to machining of a spindly shaft of an electric submersible pump and the yield of the spindly shaft reaches over 99%.

Description

technical field [0001] The invention relates to a forming method of a Monel alloy, in particular to a forming method of a Monel alloy rod in a vacuum state, and belongs to the technical field of metal vacuum smelting and vacuum casting. Background technique [0002] As an important mechanical oil recovery equipment, electric submersible pumps have been widely used in oil fields. With the increase of well depth, the number of stages of electric pumps has increased, and the most has reached more than 200 stages, which means that the length of the pump shaft It is still lengthening, but the diameter of the shaft is not increased due to the influence of the structure of the impeller and guide wheel, which puts forward stricter requirements on the strength of the pump shaft. The pump shaft manufactured according to the traditional process is difficult to meet the performance of the new submersible electric pump. Require. [0003] The pump shaft processing technology mainly inclu...

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Problems solved by technology

[0005] Since the solidification and heat dissipation characteristics of Monel alloy are completely different from those of carbon steel and stainless steel, Monel molten steel has the characteristics of long solidification time and slow heat dissipation, so the pouring speed of Monel alloy becomes the key to the success of casting molding. When the speed is just controlled within the range of natural solidification of Monel alloy, the performance of the poured ingot is excellent and the quality is stable. If the pouring speed is too fast or too slow, there will be microscopic defects in the alloy ingot, which causes the casting yield to decline. At the same time, this After a kind of alloy ingot with microscopic defects undergoes post-stretching processing, some microscopic defects will further expand and become more harmful defects. The stretching yield can only reach about 30%, and the rest can only be partially shortened and downgraded for use. Or scrapped, high production cost, low material utilization rate, which restricts the large-scale promotion and application of the product, and cannot well meet the needs of high-performance and high-demand submersible electric pumps for high-performance slender shafts

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