日本金属学会誌

J. Japan Inst. Metals, Vol. 19, No. 10 (1955),
pp. 575-577

Studies on Impact Extrusion (9th Report). On Cold Impact Extrusion of Steel

Isao Gokyu, Hisashi Suzuki and Tsuyoshi Tada


Abstract:

Studies on cold backward impact extrusion of 0.10% carbon steel were carried out. The results of the experiments were as follows: (1) As the result of testing various lubricants applied on zinc phosphate coating,lanolin and wax proved to be most effective. (2) Under the treatment with such lubricants, the limit of extruding reduction was approximately 50∼60% on 20 mm shells. The specific extrusion force in this case was about 250 kg/mm2 or a little higher. (3) The curves of the impact extrusion force were closely similar to those of non-ferrous metals. Some physical properties of the extruded shells, including their hardness distribution, their microscopic structure, their texture upon extrusion, their tangential residual stress and their tensile strength were also studied.


(Received 1955/5/12)

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