Feeder head coating structure and treatment method of aluminum alloy low-pressure cast

Abstract

The invention relates to a feeder head coating structure and treatment method of an aluminum alloy low-pressure cast. The feeder head coating structure comprises a mold and a feeder head formed by a cavity in the mold. The feeder head is communicated with a mold cavity forming a cast body, and a sintered feeder head coating is arranged between the mold and the feeder head. The thicknesses, from the bottom of the feeder head to an opening, of the feeder head coating are gradually decreased to form a gradient. The feeder head coating with the gradient is adopted for making the coating at the bottom of the feeder head be thick, the thicknesses from the bottom of the feeder head to the opening are gradually decreased, in this way, the thermal insulation effect is excellent, molten metal at the bottom of the feeder head is prevented from solidifying firstly in the process of feeding, it can be effectively guaranteed that sufficient feeding is performed on the cast through the feeder head, the feeder head coating has certain surface strength and smoothness after sintering, the adhesion property of the coating on the mold is good, the combination between coatings is good, the possibility that in the casting process, the high-temperature molten aluminum erodes the coating is lowered, and the feeder head coating is effectively prevented from falling off in the process of cast stripping.

Description

technical field [0001] The invention relates to the field of metal mold low-pressure casting, in particular to a riser coating structure and a treatment method of an aluminum alloy low-pressure casting. Background technique [0002] Low-pressure casting is already a mature casting process at home and abroad. Metal mold low-pressure casting makes the metal liquid flow against the direction of gravity to fill the metal mold cavity and solidify through external force. The casting surface prepared by the method has the advantages of good smoothness, high density, good mechanical properties and the like. [0003] In low-pressure casting, riser feeding is often used at the parts of the casting that cannot be fed by the gating system. At present, the coating treatment method in the riser is often used to apply a layer of thermal insulation coating on the riser, and to coat the riser with refractory coating. Material, put a formed riser sleeve at the riser or fill the back of the r...

AI Technical Summary

Problems solved by technology

Although placing a formed riser sleeve at the riser can solve the problems caused by the above two methods, but because there are risers of different shapes on a single casting, it is difficult to customize the riser sleeve, and the riser sleeve needs to be placed again for each mold. , which increases the on-site pouring operation process and increases the production cost

The back of the riser is filled with insulation material, which requires a larger riser, which is sometimes impossible to achieve due to the influence of the mold size

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