Feeding and returning system, extruding die-casting machine and casting method thereof

Abstract

The invention discloses a feeding and returning system, an extruding die-casting machine and a casting method thereof and relates to the technical field of metal mold pressure casting. The feeding andreturning system is characterized by comprising an extruding charging barrel, a liquid lifting pipe and a low-pressure nitrogen holding furnace, wherein the extruding charging barrel is connected with a die cavity; the liquid lifting pipe communicates with the lower side of one end, far away from the die cavity, of the extruding charging barrel; and the low-pressure nitrogen holding furnace is used for storing molten high-temperature aluminium alloy. According to the feeding and returning system, during extrusion casting or partial pressure casting, the interior of the molten aluminium alloyis ensured not to be mixed with gas during the casting and filling process of molten aluminium alloy, the purpose of enabling a casting product to carry out T6 thermal treatment preparation conditionis realized, and the molten high temperature aluminium alloy is effectively ensured to be isolated from the oxygen-rich air to avoid the situation that local oxidation of the molten high-temperature aluminium alloy affects the casting quality, production efficiency and manufacturing reliability.

Description

technical field [0001] The invention relates to the technical field of metal mold pressure casting, more specifically it relates to a feeding and returning system, a squeeze die casting machine and a casting method thereof. Background technique [0002] At present, the squeeze casting machine commonly used in the domestic market (as shown in the national foundry machinery industry standard JB / T12551-2015), its mold clamping part is similar to the ordinary cold chamber die casting machine, and its extrusion (injection) Part of it is a swing-type extrusion mechanism placed vertically under the mold, including the vertical extrusion barrel fixed on the mechanism, which also tilts to the outside of the machine along with the mechanism, so that it can be used manually or using the soup machine The aluminum liquid is poured on it, and the extrusion mechanism swings back to its original position after the pouring is completed. Finally, the extrusion mechanism injects the aluminum l...

AI Technical Summary

Problems solved by technology

[0004] However, during the return process of the intelligent alloy liquid extrusion casting molding device at the end of the "primary charging", the remaining material is exposed to the oxygen-enriched air state, and when it is slowly descending by its own gravity, it will be at the feeding port (Feeding pipe interface) is easy to form adhesion and dense oxide layer. Due to the increase of the melting point of the oxidized adhesion aluminum material (the melting point of pure alumina is as high as 2050 ℃), it cannot be completely removed in the next "preliminary filling". Melting, so after many times of accumulation, it is difficult to ensure the normal work of the feeding port, so that it is necessary to rely on the removal of "hammer" (extrusion punch) and other parts for cleaning and recovery of reproduction; at the same time, excessive oxidation The final high-temperature aluminum alloy molten metal will cause a substantial decline in the overall quality of castings (casting quality, metallographic structure, and material quality, etc.), which will affect the production efficiency and product quality of castings, which needs to be greatly improved

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