Hot press fabrication of hemisphere shell product made of bamboo fibers extracted with a machining center

Bamboo grows faster than other renewable natural materials. Bamboo fiber, in particular, has attracted attention as an environmentally superior material. Therefore, we proposed a sustainable manufacturing system using bamboo. An extraction method of bamboo fibers end-milled using a machining center with in-situ measurement is proposed. Bamboo fibers with high precision shape are efficiently acquired. In the present report, we propose the fabrication of binder-free composite by a hot press forming method that only uses bamboo fibers extracted by a machining center. We experimentally demonstrated various hot press forming conditions and achieved proper forming conditions to optimize the forming process. We also made various three-dimensional shapes considering the practical applications of the formed binder-free bamboo fiber moldings.

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Driving Performance of Natural Fiber Gears Made Only from Bamboo Fibers Extracted with a Machining Center

International Journal of Automation Technology ◽

10.20965/ijat.2020.p0280 ◽

2020 ◽

Vol 14 (2) ◽

pp. 280-293

Author(s):

Tetsuya Kawabata ◽

Toshiki Hirogaki ◽

Eiichi Aoyama ◽

Hiromichi Nobe ◽

◽

...

Keyword(s):

Bending Strength ◽

Natural Fiber ◽

Spur Gear ◽

Hot Press ◽

Machining Center ◽

Machine Element ◽

Press Method ◽

Bamboo Fibers ◽

Plastic Gears ◽

Press Molding

Plastic gears are light and can be used without any lubricant, but they have low strength and an adverse effect on the environment. Therefore, a new gear that maintains these advantages while mitigating the disadvantages has been proposed. The development of sustainable and reproducible natural materials is desired to address these environmental problems. Therefore, in this study, a method was devised to extract high-quality and precise bamboo fibers using a machining center. Then, the hot press method was used to produce a novel spur gear made from only bamboo fibers, which is a green and organic machine element with a complicated shape. The present paper describes the characteristics of the proposed bamboo fiber gears, considering experimental results, including the hot press molding conditions, and the influence of fiber length on tooth bending strength, root strain, and vibration due to meshing teeth.

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Driving Performance of Natural Fiber Gears Made From Only Bamboo Fibers Extracted With a Machining Center

Volume 8: 30th Conference on Mechanical Vibration and Noise ◽

10.1115/detc2018-85512 ◽

2018 ◽

Author(s):

Takayuki Yanagawa ◽

Toshiki Hirogaki ◽

Eiichi Aoyama ◽

Syota Matsui ◽

Hiromichi Nobe

Keyword(s):

Natural Fiber ◽

Spur Gear ◽

Tooth Root ◽

Hot Press ◽

Acceleration Measurement ◽

Machining Center ◽

Machine Element ◽

Press Method ◽

Bamboo Fibers ◽

The Relationship

The advantages of a plastic gear are that it is light and can be used without any lubricant, and its disadvantages are that its strength is low and it has large environmental impact. Therefore, the development of a new gear that maintains the advantages while negating the disadvantages has been proposed. The development of sustainable and reproducible natural materials is particularly desired to address environmental problems. Therefore, in this study, a method was devised to extract high quality and highly precise bamboo fibers using a machining center. Then, the hot press method was used to produce a spur gear, which is a machine element with a complicated shape. The present paper describes the characteristics of the bamboo fiber gears investigated through experiments. The results of tooth root strain measurement showed the relationship between rotation speed and tooth root strain. In addition, we calculated the theoretical value of tooth root strain and compared it with the experimental value. The experimental value was lower than the calculated value. The results of acceleration measurement showed that that tooth root strain is associated with acceleration.

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Fabrication of Complex-Shape Products From a Binder-Free Green Composite Using Bamboo Fibers and Powders Extracted With a Machining Center

Volume 4: 22nd Design for Manufacturing and the Life Cycle Conference; 11th International Conference on Micro- and Nanosystems ◽

10.1115/detc2017-67481 ◽

2017 ◽

Author(s):

Kota Inoue ◽

Antoine Bigeard ◽

Toshiki Hirogaki ◽

Eiichi Aoyama ◽

Keiji Ogawa ◽

...

Keyword(s):

New Method ◽

Shell Shape ◽

Hot Press ◽

Green Composite ◽

Hemispherical Shell ◽

Machining Center ◽

Hot Press Forming ◽

One Step ◽

Binder Free ◽

Bamboo Fibers

Research is currently ongoing for composite materials using natural fiber with a small burden on the environment. We have been focusing on bamboo because of its fast growth, renewability, flexibility, low cost, and high specific strength. We previously proposed a novel hot press fabrication method for binder-free green composite products made from bamboo fibers extracted by end-milling with a machining center. We can use this method to form three-dimensionally shaped products, especially hemispherical shells, by using two kinds of dies. However, this method is complex and takes longer than one-step hot press forming. In the present report, we propose a new method that uses bamboo powder with a particle size of less than 500 μm. Our new method uses one-step hot press forming and is quicker than the previous method at making a hemispherical shell shape. The new method was successfully used to manufacture hemispherical shell-shape products.

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Binder-Free Green Composite Using Bamboo Fibers Extracted with a Machining Center-Investigation of Optimal Bamboo Fiber Length

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.625.355 ◽

2014 ◽

Vol 625 ◽

pp. 355-359

Author(s):

Shinya Imura ◽

Keiji Ogawa ◽

Toshiki Hirogaki ◽

Eiichi Aoyama

Keyword(s):

Sustainable Manufacturing ◽

Bamboo Fiber ◽

Hot Press ◽

Green Composite ◽

Forming Process ◽

Machining Center ◽

Press Forming ◽

Hot Press Forming ◽

Binder Free ◽

Bamboo Fibers

Bamboo grows faster than other renewable natural materials. Bamboo fiber, in particular, has attracted attention as an environmentally superior material. Therefore, we propose a sustainable manufacturing system using bamboo. A method is also proposed for extracting bamboo fibers end-milled using a machining center with in-situ measurement. Bamboo fibers with highly precise shapes are efficiently acquired. Previously, we proposed the fabrication of a binder-free composite by a hot press forming method that only uses bamboo fibers extracted by a machining center. We experimentally demonstrated various hot press forming conditions and achieved proper ones to optimize the forming process. However, we have not yet constructed a method to obtain the best fiber extracting and molding conditions considering both its efficiency and performance. Therefore, in this report, we investigate the influence of the length of used bamboo fiber on the characteristics of the molded products, as its length deeply affects the extracting efficiency and focuses on a degradable plastic as a standard of molded product strength.

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Basic Performance of Natural Fiber Bevel Gears Made From Only Bamboo Fibers Extracted With a Machining Center

Volume 6: 25th Design for Manufacturing and the Life Cycle Conference (DFMLC) ◽

10.1115/detc2020-22236 ◽

2020 ◽

Author(s):

Tetsuya Kawabata ◽

Toshiki Hirogaki ◽

Eiichi Aoyama ◽

Masao Nakagawa ◽

Hiromichi Nobe

Keyword(s):

Natural Fiber ◽

Pressing Method ◽

Bevel Gears ◽

Machining Center ◽

Module Size ◽

New Type ◽

Bamboo Fibers ◽

Mechanical Elements ◽

Plastic Gears ◽

Black Color

Abstract Metal gears can transmit large torque. The disadvantages associated with metal gears are the noise produced and necessity of lubricants. Plastic gears are advantageous because they are lightweight and can be used without lubricants. However, plastic gears have relatively low strengths and damaging environmental effects. We propose the development of a new type of gear that overcomes the disadvantages associated with metal and plastic gears whilst maintaining their advantages. To address environmental issues within manufacturing, it is particularly important to utilize sustainable and reproducible natural materials. Therefore, we devised a method for extracting high-quality and high-precision bamboo fibers using a machining center. Bamboo bevel gears, which are complex-shaped mechanical elements, were manufactured using the hot-pressing method. This paper outlines the performance and characteristics of the molded bamboo bevel gears. We investigated the degree of burning and strength of the bamboo fiber gears at various cutting and forming conditions. The results demonstrated that the degree of burning (black color) did not affect the gear strength, and the gear strength was at a maximum when the fiber length was 50% of the module size.

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