Process Countermeasures on the Scab Defects of Heavy Truck Brake Drum Castings
The heavy truck brake drum castings have the characteristics of larger outline sizes,higher axial height,larger thickness,and so on.During production process,the scab defects were prone to appear on the brake drum flange inner filleted corner positions,leading to casting scrapped when serious,and resulting in an increase in production costs.Through tracking of whole production process and comprehensive analysis of longitudinal and horizontal,the generation mechanisms of the defects mentioned above were speculated when the brake drums were manufactured by using of wet clay sand machine molding,and the process measures,such as controlling the quality of molding sand,adjusting the parameters of molding sand reasonably,shortening the pouring time,increasing the exhaust volume and so on,were put forward combining with the actual production.After a series of production tests and verification,the scab defects on the brake drum flange inner filleted corner positions were eliminated successfully.
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