Riser product introduction
Most metals and alloys decrease in volume during recooling and solidification, which is called shrinkage. If you do not take measures for this phenomenon, the casting after solidification will produce a large number of shrinkage holes, so that the casting can not meet the design requirements. To some extent, gray cast iron can not meet the design requirements. Exceptions are, to a certain extent, gray cast iron and nodular iron, as the graphite formed during solidification expands and compensates for the shrinkage of the metal. However, even for such alloys, measures may need to be taken to prevent shrinkage.
In order to prevent shrinkage holes, it is necessary to ensure that sufficient liquid metal is supplied during the solidification process of the casting to fill the shrinkage cavity that will be formed in the casting. This measure is called "feeding the casting", and the liquid storage chamber that provides the non-shrinking metal liquid is called "riser". The riser should be designed so that the feeding metal remains liquid during the feeding time, therefore, the riser must solidify later than the casting body; The riser must also contain sufficient volume of liquid metal within the time required for feeding to meet the shrinkage requirements of the casting; After, because the distance of the metal liquid flow in the casting can not be infinite, so a riser may only play a feeding role in the whole casting, so the feeding distance of the riser must be calculated to determine the number of risers required to feed the whole casting.
Applying the theory of heat transfer and solidification, it can be calculated to ensure that sound castings and castings are obtained. Large metal utilization. Small riser size.
Natural riser
The so-called natural riser is a riser formed in modeling with the same molding material (usually a kill type) as the casting. As soon as the liquid metal is filled with the riser of the mold, its heat is lost through the top and side of the riser, and the riser begins to solidify. The riser of reasonable size in the sand mold has a typical solidification mode for the cast steel. The shape of the shrinkage hole is conical, the volume is only about 14% of the total volume of the riser, and a part of the volume has been used to feed the riser itself, so in fact, only about 10% of the total volume of the riser metal is used to feed the casting. The remaining part as the riser residual metal liquid must be cleaned from the casting, and can only be remelted in the furnace.
ANJF-200X Heat and insulation riser
Due to the continuous research and development of the formula and manufacturing process, the adiabatic property of the sintered refractory shell has been greatly improved, thus reducing the requirement that the ANF-200G high heating risers mainly have strong heating reaction.
200X core riser sleeve is less heated when in contact with liquid metal steel, iron or copper alloy. However, it gives off enough heat to counteract the liquid metal. Chilling effect of initial flow into riser. Subsequently, the good insulation effect of this sleeve prolongs the solidification time of the riser, which is similar to the effect of using ANF-200G high heat riser sleeve under the same conditions.
The ANJF-100B adsorption jet small riser sleeve can be used in small steel castings and cast iron with riser diameters ranging from 25 to 150mm, sometimes for copper alloy parts with riser diameters greater than 175mm, although this is usually the case. Good use of the AFB-200X thermal riser. ANJF-200X core riser is not suitable for light alloys.
ANJF-300B Variable heating sleeve (plate)
Although theoretically, use ANJF-200X core riser sleeve liner bore. It is very limited, but if the inner diameter exceeds 500mm, it is inconvenient to manufacture, transport and store, so ANJF-300B riser sleeve is introduced by AnJF-300B, which is a major breakthrough in the manufacture of large steel castings, cast iron and copper based alloys using thermal insulation risers.
ANJF-300B, made of high insulation material, is quite amazing as a riser. The ANJF-300B product is supplied in a variable standard length and is easily wrapped around the riser model or made into a common shape of riser sleeve as required. The supply of variable length thermal riser overcomes the difficulties of cargo management, storage and production. The ANJF-300B variable riser series ensures its durability during use. Great benefits and economy.
ANJF-400D thermal insulation riser sleeve
The full range of riser sleeves produced by Anetjer are light in weight, good in insulation performance, prefabricated into various shapes and suitable for commonly used cast metals and alloys. It has sufficient refractoriness, and the insulation performance is improved to such a high degree that there is little additional advantage in adding exothermic reaction in the riser. These materials are characterized by fiber, robustness, low density, no smoke when used, and the ability to extend the setting time under similar conditions is close to the effect of ANJF-200X core forming risers.
The AJNJF-400D risers are suitable for all alloys, including alloy and carbon steels, ductile iron, calcined and gray cast iron, copper-based alloys and light alloys.
The 400D and 200X risers, like each other, are pre-made of various shapes of risers with special equipment. Both are suitable for all metal and alloy risers with diameters from 25 to 500mm.