鋼の熱間衝撃押出し

概要

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Hot impact direct extrusions have been carried out to test the workability of steel with high strain rate and large deformation using the high energy rate metal-working machine, Dynapak. The strain rate was up to 3.6×10^3 sec^<-1> and the extrusion ratios were from 4 to 25. The extrusion pressure and the relative displacement of punch and die were recorded by synchroscope. Results obtained are summarized as follows : (1) Impact energy E and extrusion length χ_0 are approximately proportional, i. e., E=S q^^-χ_0, whers S is the cross-sectional area of container and q^^- is the mean extrusion pressure. (2) Mean extrusion pressure is approximately proportional to the natural logarithm of extrusion ratio γ, i. e., q^^-=B ln γ. (3) Extrusion pressure q is proportional to the n-th power of extrusion velocity χ^^., i. e., q=q_0 χ^^.^n. (4) When the extrusion velocity becomes higher, there appear inertia forces of the form of 1/2 Sργ^2 χ^^.^2 and S ργ^2 χ^^<..>x, where ρ is the density of materials. These behaviors are discussed in comparison with those in tension-compression test and hydraulic extrusion.
社団法人日本鉄鋼協会の論文
1964-07-01