Hot-top casting process of 7075 aluminium alloy round rod with diameter of phi582 mm

Abstract

The invention discloses a hot-top casting process for casting a large-diameter hard aluminium alloy round rod by using a wiping disc. The process comprises the following steps of: a, batching; b, melting; and c, casting, wherein the casting step is a key process. The process protected by the invention is a casting process of a largest-diameter hard aluminium alloy which is put into operation in the country currently. Namely, the process comprises: hot-top casting equipment is used; the wiping disc is configured at the same time; step type casting process parameters are adopted; the suspension height of the wiping disc and the three casting process parameters are searched; and finally, the best casting process of the 7075 aluminium alloy round rod with a diameter of phi582 mm is established. According to the process disclosed by the invention, the crack tendency in the process of casting the large-diameter hard aluminium alloy can be greatly reduced without the bottoming process; the cast round bar has good grain size, thin coarse grain layer and good surface quality; and the turning quantity on the cast rod before extruding is reduced, therefore, the production cost is reduced, and the yield is increased.

Description

technical field [0001] The invention relates to the field of aluminum alloy melting and casting, in particular to a raw material casting process for large-section hard aluminum alloy extruded profiles and extruded rods. Background technique [0002] With the needs of the development of production practice, the demand for large-diameter aluminum alloy round cast rods is also increasing. The largest extrusion machine currently in use in China is the 12500T double-acting hydraulic extrusion machine of Liaoning Zhongwang Group. The required aluminum The diameter of the alloy round casting rod is Ф582mm. For the casting technology of this large-diameter hard alloy round casting rod, most of the existing technologies adopt the traditional high-level funnel casting method. In order to avoid bottom cracks in hard aluminum alloy casting, the bottom needs to be laid before casting , there are many supporting auxiliary facilities, cumbersome procedures, large investment in manpower and...

AI Technical Summary

Problems solved by technology

[0002] With the needs of the development of production practice, the demand for large-diameter aluminum alloy round cast rods is also increasing. The largest extrusion machine currently in use in China is the 12500T double-acting hydraulic extrusion machine of Liaoning Zhongwang Group. The required aluminum The diameter of the alloy round casting rod is Ф582mm. For the casting technology of this large-diameter hard alloy round casting rod, most of the existing technologies adopt the traditional high-level funnel casting method. In order to avoid bottom cracks in hard aluminum alloy casting, the bottom needs to be laid before casting , there are many supporting auxiliary facilities, cumbersome procedures, large investment in manpower and material resources, high safety hazards brought by bottom laying, and low production efficiency; not only that, the traditional high-level funnel casting method to manufacture large-diameter aluminum alloy round casting rods The coarse grain layer is thick and the surface quality is poor. Before extrusion, the cast rod must be processed by car to obtain a smooth surface, which greatly increases the production cost, and the internal quality cannot be guaranteed, the production cost is high, and the yield is low.

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