All foundries are aware of the need to minimize the size of the riser to the point where it is possible to produce perfe
If a liquid metal in a riser is directly exposed to the air, the heat will soon disappear, and the side of the riser will be covered with silica sand or insulation riser sleeve, so the heat loss will be slower than that at the top, and will form a V-shaped throat when solidified, affecting riser feeding efficiency. At the same time, the premature solidification of the riser will cause crusting, affecting the evolution of gas within the casting and the floating of the scum, leading to an increase in the rejection rate.
Through continuous experiments and research, the factory has determined the best ratio of insulation material and heating material, and produced a riser insulation and heating agent.
Physical and Chemical Indicators:
|Indicator||Melting Point (oC)||Particle Size (Mesh)||Melting Speed (s )||Multiple||Moisture (％)|
|%||30~ 45||20- 28||5～ 10||3- 5||7～ 10|
Under the premise of not using the insulation riser cover, this product can increase riser heat supply through its own thermal insulation and heat, significantly prolong the crust time of the top of the riser, and make the liquid metal in the riser under the action of atmospheric pressure for a long time, and with the solidifying contraction of liquid metal in the cavity, the metal liquid at the riser compensates and forms a feeding. At the same time, it is conducive to the precipitation of gases in the castings and the floating of inclusions.
Benefits for Users:
1. Reduce the use of riser insulation sleeve and save costs;
2. The gas in the casting is gradually precipitated and the scum is allowed to float, which reduces the rejection rate of castings due to the pores and scum, and enhances the comprehensive benefits;
3. The weight of the riser will be reduced by more than 50%, the craft production rate of the will be increased by more than 10%, and the energy consumption will be reduced;
Application Method and Effect Picture
|Riser Diameter mm||200||250||300||400||450||500||550||600||650||700||750||800|
After pouring, cover the top of the riser quickly