Determination of deformation forces in cavity press forging

Abstract

This paper contains the results of press forging tests on En 3B steel slugs. Several axisymmetric parts differing in shape and size were forged. A resistance strain gauge load cell fitted under the lower die insert recorded the deformation forces, and job parameters were measured off the billets and off the forged parts. Multiple regression analyses of the data obtained showed that within the temperature range of 1125°–1260°C, die loads increase significantly with the weights and parting areas of the press forged En 3B steel components and with the width to thickness ratios of flashes formed, but diminish with increasing slug temperatures. The analyses also demonstrate that complicated parts require greater loads to forge them. Parting area has also been shown to be the most significant geometric factor influencing cavity press forging load.