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水压机以及其它重型机械设计与使用的实践表明:类似立柱的零件的承载能力在很大程度上取决于螺纹的结构及其制造工艺。大多数情况下,为了制造能工作的立柱,其许用拉伸应力取500～600公斤/毫米~2。尽管如此,立柱仍有损坏情况。例如,根据某工厂的资料,瓦格湼尔(Вагнер)公司的1200吨四立柱蒸汽液压锻压机的、由40号钢(σ_b=50公斤/毫米~2,σ_s=25公斤/毫米~2)制成的一直径为300毫米的立
The practice of designing and using hydraulic presses and other heavy machinery shows that the load-bearing capacity of a column-like part depends very much on the structure of the thread and its manufacturing process. In most cases, it is permissible to use a tensile stress of 500-600 kg / mm2 in order to make a working column. In spite of this, the column is still damaged. For example, according to the information of a factory, the steel of No. 40 (σ_b = 50 kg / mm 2, σ_s = 25 kg / mm 2) of the 1200 ton four-column steam hydraulic forging press of the company Вагнер, Made of a diameter of 300 millimeters