Cast aluminum-copper alloy material and preparation method and application thereof

Abstract

The invention provides a cast aluminum-copper alloy material. The cast aluminum-copper alloy material is characterized by being prepared from, by weight, 4.70%-5.80% of Cu, 0.50%-0.70% of Mn, 0.20%-0.40% of Mg, 0.15%-0.35% of Ti, 0.30%-0.60% of Zr, 0.15%-0.30% of Sc, smaller than or equal to 0.30% of Fe and Si, smaller than or equal to 0.02% of Na and K and the balance Al and inescapable impurities. The invention further discloses a preparation method and application of the alloy material. Compared with the prior art, the cast aluminum-copper alloy material has the advantages that the aluminum alloy material can be used for replacing a QT450-10 ductile iron material for making pump shells, the lightweight, casting molding and bearing strength requirements are met, and the problem that no high-strength cast aluminum material can be used is solved.

Description

technical field [0001] The invention relates to a cast aluminum-copper alloy, which is more suitable for high-strength and high-toughness occasions. The invention also discloses a preparation method of the cast aluminum-copper alloy and its application in an axial piston pump casing . Background technique [0002] Axial hydraulic piston pumps are the key core components of various types of construction machinery, such as walking or mobile machinery, which directly affect various key technical indicators such as the performance, function, energy consumption, manufacturing cost and commercial competitiveness of the host platform. Lightweight, high pressure, and large flow are the eternal themes in the development of hydraulic plunger pumps. Cast iron and steel are currently the main materials used for plunger pump housings, which have disadvantages such as heavy weight and poor corrosion resistance, resulting in high energy consumption for equipment manufacturing, high mainte...

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Problems solved by technology

[0005] The Chinese invention patent with the patent number ZLCN201410417136.2 is "A High-Strength Aluminum Alloy and Its Preparation Method" (authorized announcement number CN104195391B), which discloses a high-strength aluminum alloy material with a tensile strength of up to 700MPa. Obviously, The tensile strength level is much higher than 450MPa, which meets the strength requirements of the pump casing, but its manufacturing method is solid-state molding, which is difficult to meet the technical requirements of casting and molding of complex pump casings

[0006] The Chinese invention patent application with the application number CN201610196580.5 discloses "A High-Strength Cast Aluminum Alloy and Its Preparation Method" (Application Publication No. CN105803272A). The high-strength cast aluminum alloy material disclosed in this document belongs to the aluminum-silicon alloy. It has good casting performance and small thermal cracking tendency, which can meet the molding requirements of casting complex pump casings, but its tensile strength is low, such as 340-379MPa, and the elongation after fracture is lower, which cannot meet the high-strength load-bearing requirements of pump casings.

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