Lubrication in Hot Forging with Pulsed Ram Motion

Abstract:

The effect of pulsed (oscillating) ram motion control on lubrication was investigated in hot forging of stainless steel workpiece with oxide glass lubricant. During the retreat in the pulsed ram motion, the workpiece was re-lubricated by flow of lubricant through the gap between the workpiece and the die. A hot spike-type forging test on a servo press with pulsed ram motions was carried out to investigate the lubrication performance of the oxide glass. In the test, the workpiece with a temperature of 1223 K was extruded into the hollow part of the upper die together with oxide glass in a manner that combined pulsed and stepwise ram operations. The re-lubrication of the workpiece with oxide glass was confirmed by the test results showing 5–10% reduction in the forging load and 5% longer length of the backward extruded part of the workpiece under an appropriate pulsed ram motion.

• Periodical: Key Engineering Materials (Volume 767)
• Pages: 149-156
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.767.149
• Online since: April 2018
• Authors: Ryo Matsumoto, Hiroshi Utsunomiya, Shinya Ishigai
• Keywords: Friction, Hot Forging, Lubrication, Oxide Glass, Ram Motion, Servo Press

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