gate, runner location critical to quality castings.

The runner Basin is an expansion of the bottom of the runner, reducing the turbulence in the liquid metal that enters the runner.
Typically, in a horizontally split mold, high speeds occur at the bottom of the downpour, which, if not controlled, can lead to serious gas and oxide Entertainment and possible mold erosion.
Although the rectangular gate basin is theoretically the best shape, the circle can also be.
A good basin design has a flat or convex bottom rather than a concave shape that can cause a metal splash and capture a gas or oxide.
The effective pouring system of the non-pressurized system keeps full throughout the pouring process.
Due to the gate ratio required for a non-pressurized system, the ingate location is critical to creating and maintaining a complete system.
The biggest Cross
The cross-sectional area of the system is usually located in ingate (s).
As a result, the choke located at the bottom of the downpour Road will never provide enough metal to flood the runner and ingates unless both are positioned correctly.
If the non-pressurized system is treated as a funnel, it is easy to fill and maintain a certain depth of liquid.
Reverse the funnel, the opposite is true.
Pourer will never be able to fill ingate by introducing enough metal through the downpour (s).
To fill this system correctly, place ingate correctly (s)
It is essential to relate to runners.
If the gate is placed in a fit with ingates, most metals will go directly into the cavity without filling the gate system.
Place the runner in drag and ingate (s)
Before any metal enters ingate, the runner will always make sure that it is completely submerged (s).
This design is preferred.
The pressurized system is different from the non-pressurized system, which tends to fill quickly due to its gate ratio.
The smallest total Cross
The cross-sectional area will always be the inner gate (s).
Because Ingate (s)
The gate and the gate limit the flow beyond the flow that can be provided by the gate, the gate should always keep the system full.
Location of runner and ingate (s)
It becomes more important as a way to clean the molten metal than to build and maintain a complete system.
Impurities in the metal flow float, which determines the shape and direction of the flow channel.
In a pressurized system, runners and ingates (s)
The runner is located at least twice as tall as the width.
This allows oxide or sand to migrate up and away from Ingate (s)
The entrance of the parting line.
If the equal part of the runner is placed in the drag, you can use the drag ingates.
Positioning part of the gate in resistance allows the first metal to enter the mold cavity along the gate.
When using multiple ingates, each ingate should provide an equal amount of metal to reduce sand defects and facilitate directional solidification.
Free momentum in straight design
The liquid metal that flows around ingate (s)
Near the downpour Road.
The direction does not change until an equal or greater force works on it.
This force is usually the reverse pressure generated after the molten metal hits the end of the runner.
Ingate, farthest from the downcast, transports the first and most of the metal into the mold cavity, and then continuously delivers ingates closer to the downcast.
Therefore, the end ingate will also be the position of sand erosion and expansion as well as shrinkage defects.
In an effective system, each ingate will deliver the same amount of metal and start filling at the same time.
This is due to reduced cross
The area passed by ingate exceeds the cross-sectional area of each ingate runner.
The entire runner can get the same flow by simply tapering.
However, a step-by-step design is more desirable.
The first metal under the extension of the gate, the quality of the gate is the worst.
A few inches more than the last ingate sprue extension will capture and prevent this contaminated metal from entering the mold cavity.
If there is not enough space in the flask, then some type of pool is valid.
For those who would like to learn more about gate and elevation design, CMI will offer courses in July and September 1992.
For more information, please call the CMI 800/537-4237.