A rare earth aluminum-magnesium alloy tire mold casting material and its preparation method

Abstract

The invention discloses a rare earth aluminum-magnesium alloy tire mold casting material. Raw materials of the casting material include an aluminum-magnesium alloy, an aluminum-manganese alloy, a rare earth alloy and aluminum titanium boron. The aluminum-manganese alloy accounts for 0.03%-0.06% of the total mass of the aluminum-magnesium alloy, the rare earth alloy accounts for 0.01%-0.04% of the total mass of the aluminum-magnesium alloy, and the aluminum titanium boron accounts for 0.08%-0.12% of the total mass of the aluminum-magnesium alloy. The invention further provides a manufacturing method of a rare earth aluminum-magnesium alloy tire mold. The hardness, the machining performance and the mechanical performance of the tire mold manufactured by reasonably selecting low-pressure casting technology parameters are effectively improved, various index requirements for a hook face of the high-end radial tire segmented mold manufactured finally are effectively met, meanwhile the life of the mold in the best use state is prolonged, and the rare earth aluminum magnesium alloy tire mold casting material and the manufacturing method of the rare earth aluminum magnesium alloy tire mold become the historic promotion and progress again for low-pressure precise casting tire mold pattern block materials and preparing methods.

Description

technical field [0001] The invention relates to a preparation method in the field of rare-earth aluminum-magnesium alloy casting materials, in particular to a low-pressure casting material for rare-earth aluminum-magnesium alloy pattern blocks of a tire active mold and a manufacturing method thereof. Background technique [0002] The continuous development of the automobile industry in today's world has provided a huge market for the tire industry, and radial tires have naturally become the standard for measuring the technological modernization level of a country's automobile tire industry. At the same time, the demand for tire molds is also increasing. The continuous progress of the tire mold industry has promoted the rapid development of tire mold technology and has made great progress. At present, the three major technological methods are aluminum alloy precision casting, electric discharge machining and high-speed milling. [0003] Among them, the aluminum alloy precis...

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Problems solved by technology

[0004] However, the casting quality of pattern blocks cast by domestic aluminum-magnesium alloys is unstable, mainly reflected in the difficulty of controlling casting quality problems such as oxides on the casting surface, shrinkage porosity, and pores. The key is the strength and hardness of the material and other mechanical properties and mechanics. It is more difficult to improve the performance, requiring repeated manual trimming, welding repair, etc., which greatly reduces the requirements for various indicators of the curved surface of the high-end radial tire active mold, and increases the cost. Moreover, the life span of the best use period is too short, which is a problem recognized by the world; Due to the characteristics of high-magnesium alloys, the basic range of mechanical properties and mechanical properties of tire molds cast by ordinary aluminum-magnesium alloys (such as: ZL302, AC7A, A514.2 and other national brands) are: hardness up to 58HB, tensile strength up to 180MPa, the yield strength reaches 78MPa, and the elongation rate reaches 11%. The surface of the aluminum mold is smooth and the accuracy of the entire tread is limited by the material, and the accuracy will be lost in a short time (because the tire mold needs to be dry ice cleaned or sand blasted during use. , the mold loss is very large)

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