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How To Determine The Casting Position Of The Valve Castings?
- Jul 12, 2017 -

The casting position of the valve castings refers to the position of the casting in the casting at the time of pouring, which has a great effect on the quality of the casting. How can the position of the castings be determined?

1, the valve castings of the important processing surface or the main face should be facing down or towards the side, because the casting surface defects (such as trachoma, pores, slag, etc.) is usually more than the lower part of the organization is not as dense as the following. If these planes are difficult to do, try to make them on the side. When there are a number of important processing surface, the larger face down, and the surface of the upward use of the margin to increase the way to ensure the quality of the valve castings.

2, the valve castings a large plane should face down. This is due to the pouring process, the high temperature of the liquid metal on the cavity on the surface of a strong thermal radiation, and sometimes the cavity on the surface of the sand due to rapid thermal expansion and arching or cracking, so that the surface of the valve castings sand defects. Obviously, the more flat the horizontal position of the plane, the more easily produce the upper surface sand. To this end, for the flat castings, to make the big plane down.

3, in order to prevent the valve castings on a large area of thin-walled parts of the production of insufficient or cold separation defects, should try to large surface of the thin part of the lower part of the mold or vertical, tilt, which is particularly important for poor mobility of the alloy.

4, easy to form the hole of the valve castings, pouring should be part of the thick part of the sub-surface near the side or side, so easy to install the valve in the thickness of the direct placement of the riser, so that the bottom of the order of solidification, Fill to prevent shrinkage.