Under the effect of heat, the metal liquid would begin to solid

　　One the professional wheel loader tooth pin production manufacture attention the common people that the during the normal procedures, the under the effect of the transport heat period, the metal liquid would begin to solid into the surface of the casting working piece of the wheel loader tooth pin, so it would produce a big amounts of the content crystals and form into the whole bracket, then produced into the solid shrink, but wheel loader tooth pin production manufacture need to attention that there still exist a layer, which is not fully solid between these content crystals.

　　So if there are has no conditions to limit the solid of the casting working piece, and it means the content crystal don’t need to suffer any power of pressure, so the casting piece of the wheel loader tooth pin can be shrink with a very free way, and produce some stress force among its inside space. So if there are some power limit the solid, then the content crystal layer would produce some tensile stress.