In situ observation of re-lubrication of die–workpiece interface during forging with ram pulsation

Matsumoto, Ryo; Nakamura, Yusaku; Utsunomiya, Hiroshi

Journal of Manufacturing Processes, 2023, 101, 675-686

Number of Access:468（2025-08-14 14:29 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/93993

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Title
In situ observation of re-lubrication of die–workpiece interface during forging with ram pulsation
Creator
NRID
1000050362645 1000050362645
ORCID
0000-0002-4477-2139 0000-0002-4477-2139
researchmap permalink
ryo-matsumoto ryo-matsumoto
Scopus Author ID
35512063000 35512063000
CreatorName
Matsumoto, Ryo
CreatorName
Nakamura, Yusaku
NRID
1000080252584 1000080252584
researchmap permalink
read0042799 read0042799
Scopus Author ID
7102139699 7102139699
CreatorName
Utsunomiya, Hiroshi
Subject
Extrusion
Forging
In situ observation
Lubrication
Ram pulsation
Description
Matsumoto R., Nakamura Y., Utsunomiya H.. In situ observation of re-lubrication of die–workpiece interface during forging with ram pulsation. Journal of Manufacturing Processes 101, 675 (2023); https://doi.org/10.1016/j.jmapro.2023.06.017.
Abstract
With the aim of investigating the re-lubrication behavior under ram pulsation, the contact interface between die and workpiece was in situ observed during cold forging. For in situ observation, the die was partly made of transparent ceramic glass, while the workpiece was used commercially pure aluminum. A microscope and high-speed camera were used for observing and recording the contact interface. For analyzing the lubrication behavior, visibility of polybutene lubricant was enhanced by oil-soluble black colorant, and the brightness value of the observed image was used. Obtained results indicated that the lubricant was thickened by approximately 1–10 μm at each ram pulsation through the ram retreat movement in forging with complete unloading ram pulsation. The re-lubrication behavior during ram pulsation was discussed by the thickness of the lubricant, forming load, deformation, and surface roughness of the workpiece.
Publisher
Elsevier Ltd
Source Title
Journal of Manufacturing Processes
Volume (Issue)
101
Page
675-686
Date of Issued
2023-09-08
Language
English
Handle URL
https://hdl.handle.net/11094/93993
PISSN
15266125
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1016/j.jmapro.2023.06.017
Access Rights
embargoed access
CopyRight
© 2023. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
The full-text file will be made open to the public on 8 September 2025 in accordance with the publisher's policy.
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article