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用板料冷弯的弯曲型鋼代替热軋型鋼,是农业机械結构設計的重要发展方向之一。一般可节約材料25％。 本文介紹了以高强度鋼代替普通碳鋼的方法,指出通过調质等工艺措施,重量可减輕15～35％,同时成本降低5～15％。另外介紹了以冷弯的变截面梁代替热軋的等截面梁的方法。 薄壁弯曲型鋼一般做成开口截面,农业机械构件受約束扭轉的很多,因而成双曲綫分布的扇性应力σ_w在局部有时达到很大值,成为构件破坏的主要原因。本文简述了扇性应力的基本理論和各种扇性特性,介
Replacing hot-rolled steel with curved cold-formed sheet steel is one of the important development directions of agricultural machinery structure design. Generally can save material 25%. This paper introduces the method of replacing ordinary carbon steel with high strength steel, and points out that the weight can be reduced by 15-35% and the cost can be reduced by 5-15% through the process of quenching and tempering. In addition, a method of replacing cold-rolled cross-section beams with cold-formed cross-section beams is also introduced. Thin-walled bent steel is generally made of open cross-section, agricultural machinery components are bound to reverse a lot, so the hyperbolic distribution of the fan stress σ_w sometimes reaches a large local value, become the main cause of component failure. This paper briefly describes the basic theory of fan stress and various fan properties