Process for manufacturing siamese-type cylinder block

Details Process for manufacturing siamese-type cylinder block Process for manufacturing siamese-type cylinder block

B - Operations, Transporting

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B22D 19/00 (2006.01) B22D 17/00 (2006.01) B22D 17/32 (2006.01) C21D 9/00 (2006.01) F02F 1/00 (2006.01) F02F 1/10 (2006.01) F02F 7/00 (2006.01) F02B 75/18 (2006.01)

Patent

CA 1256265

ABSTRACT OF THE DISCLOSURE A process for manufacturing a siamese-type cylinder block which is disclosed herein comprises a blank making step of providing a cylinder block blank in which a sleeve made of a cast iron is cast in each cylinder barrel of a siamese-type cylinder barrel made of an aluminum alloy and consisting of a plurality of cylinder barrels connected in series, and a mechanically working or machining step of forming the inner peripheral surface of each sleeve of the cylinder block blank into a true circle. The process is characterized in that the blank making step includes placing highly rigid sleeves each having a thickness set as large as 10% or more of the inner diameter thereof into a siamese- type cylinder barrel molding cavity in a mold and then pouring a molten metal of aluminum alloy under a pressure into the cavity to effect a casting. The sleeve is cast-in as it is at an ambient temperature or in a heated state. A cylinder block blank resulting from the casting-in of sleeves at an ambient temperature is subjected to a thermal tratment for reducing the casting strain in each cylinder barrel.

494738

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