Insulating riser and manufacture method thereof

Abstract

The invention discloses an insulating riser, comprising a hollow riser body. The hollow riser body comprises an insulating layer and a plurality of heating sheets, the plurality of heating sheets are peripherally bonded to the inner wall of the insulating layer, the heating sheets are tightly attached to one another, the outer side of the heating sheets mates with the inner side of the insulating layer, and the heating sheets are connected with the insulating layer through a locking device located outside the insulating layer; the heating sheets are made from, according to parts by weight: 30-50 parts of hollow microspheres, 10-20 parts of aluminum powder, 5-15 parts of ferric oxide, 20-40 parts of magnesium powder, 40-60 parts of charcoal powder, 5-15 parts of potassium permanganate, and a suitable amount of bonding agent and water, wherein the bonding agent is sodium silicate. The invention also discloses a manufacture method of the insulating riser, overcoming looseness and shrinkage defects of light alloy sand castings, improving compactness of castings, saving energy and reducing consumption, and reducing production cost.

Description

technical field [0001] The invention relates to the technical field of alloy casting, in particular to a thermal insulation riser and a manufacturing method thereof. Background technique [0002] In casting production, during the solidification and shrinkage stage of castings, risers are often used to feed castings, and the application of heating and heat preservation riser technology is an important process measure to obtain high-quality castings. In order to meet the needs of the development of the foundry industry, various manufacturers of casting auxiliary materials have developed various styles of thermal insulation riser sleeves. For example, the invention patent No. 201220346420.1 discloses a heating and thermal insulation double-layer riser sleeve; patent No. The invention patent of 201320390269.6 discloses a heat-insulating riser sleeve, both of which combine the heat-insulating layer and the heat-generating layer with a simple structure to make the heat-insulating ...

AI Technical Summary

Problems solved by technology

[0003] However, most of the heating and heat preservation riser sleeves that appear on the market are developed specifically to meet the needs of large quantities of castings and steel castings on the molding line. When the casting process needs to be improved in order to improve the quality of the castings, especially in many Variety, small batch casting trial production, improvement and production, the flexibility and adaptability of this kind of insulation riser sleeve are limited; in addition, due to the wide crystallization interval of aluminum-magnesium alloy, it will cause shrinkage during the solidification process of the alloy. Therefore, in the actual process design and production, a larger riser size is required, which puts forward higher requirements for the thermal insulation effect of the riser sleeve, while the heating and heat preservation riser sleeves in the prior art are all aimed at ordinary casting The design has a very limited effect on improving the feeding effect of the riser of aluminum-magnesium alloy castings

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