Ball on the current international trend is to large-scale development, the cylinder end caps at both ends of size is also growing. Cover material is generally low-alloy steel casting, the casting solidification characteristics determine the formation of micro-porous and easy, not easy to repair in the finish after welding and tempering treatment caused a huge waste. Traditional casting production is based on experience to determine the casting process, casting the first trial to test the existence of casting defects in the sample, if you modify the process plan, and then repeat the process until the qualified castings.
Since this method must be cast before the casting process to evaluate whether it is reasonable, and therefore the method has a long design cycle, high production costs, low efficiency shortcomings. And often received not the final casting process, castings for large or complex shape of the disadvantages become more pronounced. Ball cap due to its structural features, casting wall thickness of greater problems in the shaft, etc. is not easy to control, as a constraint to the production of most important issues.
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