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辊锻过程中,由于操作不慎、锻件温度太低、锻件变形量太大等种种原因,常引起超载而导致零件破坏或造成闷车事故,辊锻机都希望设有安全保险装置,通常采用压塌式、剪切式或拉断式安全臼。这类保险装置在双支承辊锻机上,放置在上锻辊轴承座与压下丝杆(机架)间,但由于两支承点距离大,超载时受力不均,总是一端保险装置发生作用,这样上锻辊处于倾斜状态,致使轴承座压板螺钉破坏、压下丝杆不易松脱等,且可靠性差。为此,在设计试制我国最大的DA42-1100型1100毫米双支承辊锻机时,首次采用了液压气动式保险装
Roll forging process, due to careless operation, the forging temperature is too low, the forging deformation is too large and other reasons, often cause overload caused by the destruction of parts or cause boring car accidents, roll forging machines are expected to have a safety device, usually used Compression, shear or pull-off safety mortar. This type of safety device is placed on the double support roll forging machine between the upper forged roll chock and the screw down (the frame). However, due to the large distance between the two support points and uneven loading force during the overload, one end of the safety device always occurs Role, so forging roller in a tilted state, resulting in bearing plate pressure screw damage, screw down the screw is not easy to loose, and poor reliability. To this end, in the design and trial production of China’s largest DA42-1100 1100 mm double-support roller forging machine, the first time using the hydraulic pneumatic insurance