Investment casting iron plate testing method1. The ratio of cast iron plate contact areaWill be shown on the inspection on your tablet work cant agent, on not less than the accuracy grade of flat grind together, in the checked plate shows clear point of contact, and then use a 50 mm x 50 mm range score is 2.5 mm x 2.5 mm 400 small squares of transparent sheet (such as organic glass plate). In the checked plate on the working face in any position, in order to observe each box contains the proportion of the area of contact point (at 1/10) for the unit. And the proportion of the sum, divided by 4 is the testing area of the ratio of the parts of the contact. For typical numerical. Should be in a position to measure contact area, the ratio of the average of the two results.
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