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This is the wood sample without additional shrinkage(brown corundum abrasive). Generally speaking, the linear shrinkage of high manganese steel is 2.4% ~ 3.0% for small parts, 2.4% ~ 2.5% for large parts, 2.5% ~ 3.0% for medium and small plate castings, and 2.6% ~ 2.7% for sand casting. The linear shrinkage of the same casting is different in different parts and directions(white fused alumina powder). The correct selection of linear shrinkage rate needs to be summarized in production practice.

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After the parameters such as the diameter and height of the riser are determined(white corundum), the process yield of the casting shall be checked as the process design of the general steel castings. If the process yield is too low or too high, the process design of the casting shall be revised again. The thicker the wall, the stronger the heat effect of metal on the mold(aluminium oxide powder price). The shrinkage is divided into free (unimpeded) linear shrinkage and hindered linear shrinkage.(low price white alumina polishing producers italy)

The hindered linear shrinkage is lower than the free linear shrinkage, and the resistance comes from the mold and sand core(pink aluminum oxide). After the molten steel is poured into the mold, it will produce shrinkage cavity when it shrinks in the liquid state and in the solidification period.  When the superheat is the same, the volume of shrinkage cavity and thiopine only depends on the volume shrinkage characteristics of the material(aluminum oxide sandblasting media). It can also be made of high strength core sand.

(low price white alumina polishing producers italy)High manganese steel is easy to produce shrinkage cavity, so it is necessary to set riser to enhance feeding capacity(white aluminum oxide). The shrinkage in the solid state after complete solidification will reduce the volume of shrinkage cavity, but the relative value of shrinkage cavity volume, that is, the ratio of shrinkage cavity volume to casting volume, does not change(aluminium oxide manufacturers). When comparing the volume shrinkage value of various steels, the superheat degree of molten steel must be kept constant.

In addition, it is very difficult to cut the riser of high manganese steel castings(black aluminum oxide), so it is not possible to use large risers to improve the feeding conditions of high manganese steel castings, so various technological measures have to be taken to improve the feeding conditions of high manganese steel castings, such as the use of heating agent, adiabatic riser, the matching of riser and cold iron, feeding riser during pouring, etc(aluminum oxide abrasive blasting grit). The thickness of the refractory can be smaller.

High manganese steel castings often use thin necked risers and easy cutting risers, mainly to reduce the machining workload of removing risers(white fused alumina). The easy cutting riser connects the riser to the casting only through the hole on the easy cutting piece, and the rest of the cross section of the head and the casting body are separated by the easy cutting piece made of refractory material(corundum sand). It is made of refractory material and has high strength, and the riser height is 2 times of the riser diameter.(low price white alumina polishing producers italy)

When the riser is fed from the top(brown fused aluminum oxide), the diameter of the riser should be 2.5 ~ 3.0 times of the wall thickness of the casting, and the height of the riser should be 1.5 times of the riser diameter; when the edge riser is used for feeding, the diameter of the side riser is 2.5 ~ 3.0 times of the casting wall thickness. When the side riser is shared by two castings(220 grit aluminum oxide), the riser should be properly enlarged and the diameter of the riser should be 3 times of the wall thickness of the casting.