Aluminum alloy is one of the most widely used non-ferrous metal structural materials in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. With the rapid development of industrial economy, the demand of aluminum alloy welded structural parts is increasing, so the research on the weldability of aluminum alloy is also deepened. At present, aluminum alloy is the most used alloy. Heat treatment process, al-Si alloy can improve its high strength and toughness by heat treatment. The factors influencing the properties of al-Si alloy during heat treatment are: solution temperature, solution treatment time, aging temperature, aging time and so on.
By selecting the appropriate process parameters, the alloy properties can be effectively raised Gao. The effect of heat treatment process on the mechanical properties of the alloy was studied by orthogonal test, and the optimal heat treatment process was obtained by the test: the temperature of solid melt was controlled in 550℃±5℃, The holding time is 16 hours (not including heating time). After the solid-melt treatment, the quenching water cooling, the material basket into the quenching pool time control around 12s, water temperature in 60℃〜80℃, soak time about 8min.
After quenching water for aging treatment, the aging temperature is 150℃±5℃, time is 4.5 hours (does not contain heating time), after the oven air cold to room temperature. Research significance, the application of the newly developed high speed railway catenary aluminum alloy parts production of low pressure casting technology has been successfully applied to the construction of many high-speed railway. Market sales show that this type of product has a strong market competitiveness, has the ability to occupy the market-leading position, a broad market prospects.
The research and development of this project can effectively promote the capability of China's catenary components production, not to bring economic benefits to enterprises, but also to bring many benefits to the construction of a harmonious society. Through the research of this subject, it can improve the whole level of the boil industry of catenary manufacturing in our country and promote the development of China's railway industry, which is favorable to the international promotion of China's high iron enterprise. conclusion, the paper obtains the mature low pressure casting forming technology of the catenary aluminum alloy parts of the industrial high speed railway, mainly: through the nonporous of the modifier SR addition quantity, the influence law of the SR addition quantity on the alloy properties is obtained, and the alloy has excellent mechanical properties when the SR content is 0.02%. In this paper, a new six-stage booster pouring technique is proposed, and the specific process parameters of 6-stage increasing pressure method are obtained. Through the research nonporous, has obtained the brand-new low pressure casting mold spraying processing technology, in the domestic department first proposed.
Adopt the improved baking die core technology, spray the mold cavity before casting, spray the mould to 460 ℃ before spraying, heat preservation l00mim, then paint spraying, and control layer thickness is 0.2〜0.3mm. In China, the multifunctional robot is used for the first time in the low-pressure foundry production line of Ratchet and pulley body. The introduction of intelligent robot not only avoids the danger to the workers, but also reduces the labor intensity of the workers, increases the production efficiency, improves the output and saves the labor cost.
The new heat treatment technology was obtained. The effect of heat treatment process on the mechanical properties of the alloy was studied by orthogonal test method, and the optimal heat treatment process was obtained. That is, solid melt temperature control in 550℃±5℃, holding time of 16 hours after the water quenching cooling, and then the aging treatment, aging temperature of 150 ℃, insulation 4.5 hours.
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