Shelling mould casting furnace plate

Mild steel castings inside the sprue of the overlay sand forging defects how to do?

1, gas casting defects, strengthen the middle sand core exhaust, proportional to the addition of the sprue test.

2, a total of 6 boxes, a box of 5 boxes stacked box molding. If so, the stacked box casting after the gas source is very small. Most of the gas will be introduced into the inner sprue. Find the position of the common gas pin can be connected to each 5 pieces?

3, laminated sand casting side plate inside the gate cross-sectional area is too large, the inner sprue is too large, resulting in the inner sprue backward pull casting steel. The shape of the inner sprue meet, small to meet the filling time, do not consider the length of the inner sprue, the total width as narrow as possible.

Fourth, laminated sand casting stack casting, should ensure that the steel from the bottom up gradually into the cavity, filled. To ensure that the cross-gate inside the sprue of the complementary shrinkage effect, at least not cut off the straight sprue on the casting of the complementary shrinkage effect. The disadvantage is the lack of complementary shrinkage, resulting in casting defects.

The key role of additives is to improve the characteristics of laminated sand. Heat resistant additions, easy collapse additions, modified additions, anti-weld tumor additions, and wet state additions are all commonly used additions today. Many laminated sand plants have different recipes for additives. The production of laminated sand is one of the competitive advantages in the current market of laminated sand sales.