The ceramic foam filter placement method affects the removal efficiency of molten metal impurities. The ceramic foam filter is placed in the runner to filter and purify the liquid metal, which is the most ideal form of use. It is suitable for medium and small castings and large castings. The ceramic foam filter is placed horizontally, the filling is stable, the flow rate of the molten metal is slow, the impact of the molten metal on the filter is small, and the filter is safer to use. The molten metal flows in from the upper type, and the molten metal slag has a lighter density and floats to the inside of the slag bag, thereby achieving a better filtering effect. This method has the highest interception coefficient. Place the filter horizontally at the overlap of the parting surface cross runner. This ceramic foam filter placement method can better exert the slag blocking function of the upper half runner, with better filtering effect and easy installation.
Ceramic Foam Filter Placement Method
There are several methods for placing ceramic foam filters, including the sprue cup and the bottom of the sprue.
The filter is placed in the sprue cup
1. It is generally used in manual ordinary green sand molding and iron mold sand-coated molding, and it is also used in some vertical molding lines. In this placement method, the broken slag floats on the sprue cup after the filter is broken. Compared with other placements, it is not easy to enter the mold, and it is easy to observe and judge the impact resistance of the filter, and problems can be solved in time.
2. Place the pouring cup, and directly flush the metal liquid on the filter when pouring, the filter is easy to break, especially if the filter is not fixed, the chance of breaking is greater. This type of placement has stricter performance requirements for the filter than other placements.
3. There are three ways to place the sprue cup on the vertical molding line: (1) is the ideal way, which has less impact on the filter; (2) is the automatic placement of the molding line manipulator; (3) is the manual placement, Does not affect the modeling beat.
The filter is placed at the bottom of the sprue
This method is suitable for the gating system where the sprue is located in the center of the mold and has multiple runner branches. However, this type of molten metal slag has a small chance of floating up, and it is easy to cause the slag to block the filter prematurely, causing the filter to break into the casting. But this placement is easy to arrange on the mold, especially when multiple casting sprues are located in the center. The molten metal acts directly on the filter along the sprue, especially the pressure head is higher than that placed in the sprue cup, the impact of the molten metal on the filter is greater, and the requirements for various performances of the filter are also very high. , Need special attention when using.