1. Product features

Excellent thermal insulation performance

Thermal insulation riser sleeves are usually made of composite insulation materials (such as perlite, floating beads, fiber materials, refractory aggregates, etc.) through special processes. They have low thermal conductivity, which can significantly delay the cooling rate of the molten metal in the riser, extend the solidification time of the molten metal, provide continuous feeding capacity for castings, and reduce defects such as shrinkage cavities and shrinkage porosity.

Good fire resistance and high temperature stability

The material is resistant to high temperatures (usually can withstand high temperatures of 1300-1600°C) and is not easy to soften, deform or burn when exposed to high-temperature molten metal. It can maintain its own structural stability and avoid premature solidification of the riser or the mixing of impurities into the molten metal due to material failure.

Lightweight and moderately strong

Compared with traditional sand mold risers, thermal insulation riser sleeves are lighter in weight and are easier to transport and mold operations; they also have a certain mechanical strength and are not easily damaged during the molding and box closing processes, and can withstand the impact pressure of molten metal filling.

Flexible design and strong adaptability

Different shapes (such as cylindrical, spherical, elliptical, square, etc.) and specifications can be customized according to the casting structure and riser size to meet the riser design needs of various castings (small precision parts to large complex parts), and are suitable for sand casting, lost foam casting, resin sand casting and other processes.

Reduce metal consumption and reduce costs

Due to its excellent thermal insulation performance, the thermal insulation riser sleeve can reduce the size of the riser (30%-50% reduction in volume compared to traditional risers), reduce the amount of molten metal, and at the same time reduce the cleaning workload after riser cutting, indirectly reducing production costs.

Environmental protection and ease of use

Most insulation riser sleeve materials are non-toxic and harmless, and do not emit harmful gases during use; they are usually prefabricated parts that can be directly embedded in the sand mold without complex on-site processing, simplifying the casting process.

2. Main uses

The core function of the thermal insulation riser sleeve is to extend the solidification time of the riser molten metal and enhance the feeding effect. It is mainly used in various casting scenarios:

ferrous metal casting

Steel castings: such as gears, bearing seats, machine tool beds, etc. The fluidity of cast steel liquid is poor and the solidification shrinkage is large. The thermal insulation riser sleeve can effectively compensate for the shrinkage and reduce internal defects.

Cast iron parts: Especially large or complex parts of ductile iron and gray cast iron (such as wind turbine hubs and engine blocks), the feeding efficiency is improved through insulation risers to ensure the density of castings.