Outside the spherical bearing box parts with complex inner cavity, should choose easy molding materialsmanufacturing methods. Cast iron is easy to forming, cutting performance is good, price is low,good wear resistanceshock absorption.
The precision of casting blankmachining allowance is according to the production batch. For single small batch production, generally USES the wooden hand model. The low accuracy of blank, machining allowance is big, its plane allowance is commonly 7 to 12 mm, hole on the radius of the allowance can be appropriately reduced, the plane allowance for 5-10 mm, hole (radius) allowance for 7 to 12 mm. In order to reduce the machining allowance, for single piecesmall batch production is greater than 50 mm diameter hole in mass production of more than 30 mm hole, typically on the blank casting out of the hole.