SynopsisSimulation by plasticine is carried out to estimate the stress distribution and deformation o f steel in hot rolling and to prevent the generation of internal or surface crack of slab in continuous casting.In this report, first of all, the following dynamic properties of plasticine is treated to establish the foundation of simulation: i) Static properties (the stress-strain relation, its dependence on temperature and a criterion of yielding, etc.) ii) Kinetic properties (the dependence of stress on the strain-rate etc.) iii) Friction with metal surface. From the above investigation, it became clear that, there exists the following relation between the stress c(kgf/cm2), logarithmic strain e, strainrate (1/s) and temperature T (°K), in the region of T = 253° 323°K, e = 0.02-' 0.3 and E =10-2 10° 1/s; a = 1.15 X 10-5~0.085~012 exp 3 530 T Then the above result is compared with the deformation resistance of steel at high temperatures (about 1000°C). And it is confirmed that plasticine has well satisfied properties to simulate not only the deformation of steel at high temperatures but also the stress distribution.

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Synopsis Simulation of horizontal 2-stands rolling by plasticine, for compressive rolling and tensile rolling, is carried out. The following items are clarified. 1) Deformation of side face, upper face and transverse section of workpiece, and distribution of principal strain-rate and slipping velocity against rolls 2) Forces and torques acting on rolls and rolling energy 3) Distribution of pressure, circumferential frictional stress and axial frictional stress acting on the surfaces of rolls 4) Distribution of internal stress in workpiece Then the above experimental results are analysed, and the following facts become clear. (1) All the stress measurements are made with enough accuracy. (2) Distribution of principal strain-rate and others coincide well with the measured stress distributions. (3) Compressive rolling is effective to eliminate the tensile stress in the neighbourhood o f the surface o f workpiece. Tensile rolling slightly reduces rolling energy.