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Research Article
Zhi-ren Han
Shenyang Aerospace University
Corresponding Author
ORCiD: https://orcid.org/0000-0001-5873-6174
License:
This work is licensed under a CC BY 4.0 License. Read Full License
The forming limitation and the wall thickness distribution are two main parameters for estimating the forming quality of T-shaped tube. In this paper, the effects of three key factors on the forming limitation and the wall thickness distribution are investigated, which are punch front distance l1, reverse height h1 and matching relationship between rubber hardness and axial feed Δl. A new position-limited back pressure mechanism is proposed which is made up of rigid position-limited lever, flexible back pressure medium and rigid spacer. The simulations and experiments are carried out. Both results show the thinning rate of the wall thickness decreases first and then increases and the thickening rate decreases gradually with the increase of l1. The branch reaches the highest with the l1 of 5mm under the requirements of thinning rate and thickening rate. With the increase of reverse height h1, the bigger h1 is beneficial to the wall thickness thinning suppress at the top of branch, the highest branch was formed when h1 is 7mm. When Δl is fixed, the rubber hardness has a great influence on the forming defects, higher rubber hardness causes the top of branch to rupture and lower causes the wall to wrinkle. When rubber hardness is fixed, the thickening rate decreases with the increase of Δl. The best forming limitation and thickness distribution are achieved with the punch front distance l1 of 5mm, the reverse height h1 of 7mm, the rubber hardness of 70HA and the axial feed Δl of 24mm.
Keywords
T-shaped tube forming, Rubber flexible-die forming, Position-limited back pressure mechanism, Forming limitation, Thickness distribution
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CURRENT STATUS: Published
View the published article at The International Journal of Advanced Manufacturing Technology.
Version 1
Posted 04 Mar, 2021
No community comments so far
Editor assigned
On 23 Feb, 2021
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Received 23 Feb, 2021
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Subject Areas
Biotechnology and Bioengineering
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A new preprint design is coming!
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See the published version of this preprint at The International Journal of Advanced Manufacturing Technology.
This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Zhi-ren Han
Shenyang Aerospace University
Corresponding Author
ORCiD: https://orcid.org/0000-0001-5873-6174
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Published
View the published article at The International Journal of Advanced Manufacturing Technology.
Version 1
Posted 04 Mar, 2021
No community comments so far
Editor assigned
On 23 Feb, 2021
Reviewers invited
Invitations sent on 23 Feb, 2021
Reviews received
Received 23 Feb, 2021
First submitted
On 22 Feb, 2021
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Biotechnology and Bioengineering
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published article at The International Journal of Advanced Manufacturing Technology.
The forming limitation and the wall thickness distribution are two main parameters for estimating the forming quality of T-shaped tube. In this paper, the effects of three key factors on the forming limitation and the wall thickness distribution are investigated, which are punch front distance l1, reverse height h1 and matching relationship between rubber hardness and axial feed Δl. A new position-limited back pressure mechanism is proposed which is made up of rigid position-limited lever, flexible back pressure medium and rigid spacer. The simulations and experiments are carried out. Both results show the thinning rate of the wall thickness decreases first and then increases and the thickening rate decreases gradually with the increase of l1. The branch reaches the highest with the l1 of 5mm under the requirements of thinning rate and thickening rate. With the increase of reverse height h1, the bigger h1 is beneficial to the wall thickness thinning suppress at the top of branch, the highest branch was formed when h1 is 7mm. When Δl is fixed, the rubber hardness has a great influence on the forming defects, higher rubber hardness causes the top of branch to rupture and lower causes the wall to wrinkle. When rubber hardness is fixed, the thickening rate decreases with the increase of Δl. The best forming limitation and thickness distribution are achieved with the punch front distance l1 of 5mm, the reverse height h1 of 7mm, the rubber hardness of 70HA and the axial feed Δl of 24mm.
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