The effect of cushion-ram pulsation on hot stamping

Landgrebe, Dirk; Rautenstrauch, Anja; Kunke, Andreas; Polster, Stefan; Kriechenbauer, Sebastian; Mauermann, Reinhard

doi:10.1063/1.4963467

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…The same effect is described by Maeno et al [5] and Matsumoto et al [6] to prevent seizure during backward extrusion operations. Landgrebe et al show that a deeper draw or more complex geometries are suitable using cushion-ram pulsation in hot stamping operations [7].…”

Section: Introductionmentioning

confidence: 99%

Wear Prediction in Oscillating Cold Forging Processes

Groche

Schmidt

2020

Tribol Lett

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Oscillating forming processes allow forming with reduced process forces when liquid lubricants are used. They are industrially applied as oscillating cold forging processes for the production of splines. Previous investigations revealed that the force reduction is provoked by relubrication of the workpiece—tool contact zone. So far, the effect of the oscillation on tool wear remains unknown. The results presented in this paper show that the wear critical region of the tool is the calibration zone. Tool wear is emulated on a test bench under loads of representative cold forging processes. The results disclose several relevant phenomena. Friction conditions can vary considerably in the course of the oscillations. Wear protection layers are effective measures to prolong tool life also under these conditions. Prediction of wear development based on established models fails due to neglecting the local state of lubrication. Graphical Abstract

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Section: Introductionmentioning

confidence: 99%

Wear Prediction in Oscillating Cold Forging Processes

Groche

Schmidt

2020

Tribol Lett

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A Hot Stamping Line

Jonasson

Billur²,

Ormaetxea³

2018

Hot Stamping of Ultra High-Strength Steels

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Experimental and Numerical Assessment of the Hot Sheet Formability of Martensitic Stainless Steels

Birnbaum

Meza-García

Landgraf

et al. 2020

JMMP

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Hot formed sheet components made of Martensitic Stainless Steels (MSS) can achieve ultra-high strengths in combination with very high corrosion resistance. This enables to manufacture complex lightweight sheet components with longer lifespan. Nevertheless, the hot formability of MSS sheets has not been accurately evaluated considering high temperatures and complex stress and strain states. In this work, the hot sheet formability of three MSS alloys under thermomechanical process conditions was investigated. Initially, mechanical properties of this sheet material were determined by uniaxial tensile test. Finite Element Method (FEM) simulation of a hot deep drawing process was performed under consideration of thermo physical calculated material models using the software JMatPro® and Simufact Forming® 15.0. The resulting strains and cooling rates developed locally in the work piece during the forming process were estimated. The numerical results were validated experimentally. Round cups were manufactured by hot deep drawing process. The resulting maximum drawing depth and hardness were measured. In general, all three alloys developed very good formability at forming temperatures between 700 and 900 °C and increased hardness values. However, they are highly susceptible to chemical composition, austenitization temperature, dwell time, and flange gap. A statistic approach is given to explain the correlation between hardness and its influencing factors.

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The effect of cushion-ram pulsation on hot stamping

Cited by 4 publications

References 9 publications

Wear Prediction in Oscillating Cold Forging Processes

Wear Prediction in Oscillating Cold Forging Processes

A Hot Stamping Line

Experimental and Numerical Assessment of the Hot Sheet Formability of Martensitic Stainless Steels

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