scholarly journals Advances and Trends in Forming Curved Extrusion Profiles

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1603
Author(s):  
Wenbin Zhou ◽  
Zhutao Shao ◽  
Junquan Yu ◽  
Jianguo Lin
Keyword(s):  
Cross Sections ◽  
High Speed ◽  
High Strength ◽  
Full Potential ◽  
High Speed Rail ◽  
Lightweight Structures ◽  
Cold Bending ◽  
Integrated Technique ◽  
Aluminum Profiles ◽  
Technology Industries

Curved profiles/sections have been widely used for manufacturing lightweight structures with high stiffness and strength due to aerodynamics, structural properties, and design reasons. Structural components fabricated using curved aluminum profiles satisfy the increasing demands for products used in many high-technology industries such as aerospace, shipbuilding, high-speed rail train, and automobile, which possess the characteristics of lightweight, high strength/stiffness relative to weight, superior aerodynamics performance, and aesthetics. In this paper, the advances and trends in forming techniques of curved extrusion profiles of metal alloys have been reviewed. The curved profile forming techniques are classified into three major categories: conventional cold bending technique, stress/moment superposed cold bending technique, and extrusion-bending integrated forming technique. Processes for innovative development in the field of forming curved profiles are identified; the extrusion-bending integrated technique which can directly form the billets into curved profiles by one single extrusion operation possesses the full potential for further innovation. Due to the nature of the research to date, much of the work referred to relates to hollow circular and rectangular tube cross-sections.

Composite Extrusion of Thin Aluminum Profiles with High Reinforcing Volume

2013 ◽  
Vol 554-557 ◽  
pp. 801-808 ◽  
Author(s):  
Daniel Pietzka ◽  
Nooman Ben Khalifa ◽  
Stephanie Gerke ◽  
A. Erman Tekkaya
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
High Strength ◽  
Extrusion Process ◽  
Process Window ◽  
Extrusion Dies ◽  
Thin Aluminum ◽  
Lightweight Structure ◽  
Porthole Extrusion ◽  
Aluminum Profiles

Extruded aluminium profiles with a variety of different cross-sections are mainly used in lightweight structures for transportation means. Examples are stringer profiles in the fuselage of airplanes or profiles in chassis of trains and cars. Nowadays, the mass reduction of a lightweight structure is an important issue to achieve lower fuel consumption and CO2 emissions. With an increased portion of aluminium profiles the mass of structures can be reduced considerably in contrast to the application of steel parts, due to the lower density of aluminium. However, this is coupled with disadvantages such as the lower specific stiffness and strength of the material. One possibility to improve the mechanical properties of aluminium profiles without a considerable increase of their weight is the embedding of reinforcing elements during the extrusion process. Special porthole extrusion dies are used to feed reinforcing elements in form of high strength steel wires separate from the aluminium material flow. In the welding chamber of the die both materials bond together to a composite profile. To achieve a high advantage of the technology for lightweight applications a high reinforcing volume of aluminium profiles is targeted. A comparatively high reinforcing volume can be reached either by a high number of reinforcing elements or through a reduction of the profile wall thickness. A high number of reinforcing elements leads to a small distance between the single elements in the profile cross-section. The paper will show the results of an experimental and numerical analysis which were carried out to determine the minimum distance between the reinforcing elements as well as the minimum profile thickness. In the trials different arrangements of the elements in the profile cross-section and profile thicknesses were considered. Main parameters which have an influence on the process stability were analyzed and a process window for the manufacture of thin profiles with high reinforcing volume was deduced.

Hydroforging of Thick-Walled Hollow Aluminum Profiles

2012 ◽  
Vol 504-506 ◽  
pp. 181-186 ◽  
Author(s):  
Karsten Müller ◽  
Malte Stonis ◽  
Michael Lücke ◽  
Bernd Arno Behrens
Keyword(s):  
Active Medium ◽  
Lightweight Design ◽  
Tube Hydroforming ◽  
High Strength Steels ◽  
High Strength ◽  
Hydraulic Press ◽  
Limit Values ◽  
Lightweight Structures ◽  
Aluminum Profiles ◽  
Liquid Tin

Lightweight design of cars is one way to reduce fuel consumption and increase the range of cars. This is an important factor to attain the EU limit values for CO2 emissions for vehicles and so to escape penalties for exceeding these limits as of the year 2012. The increasing uses of high-strength steels or of lightweight structures are adequate means to reducing weight. At IPH – Institut für Integrierte Produktion Hannover gGmbH a method to produce hollow profiles made of aluminum was developed. The method combines flashless forging and tube hydroforming. This is called hydroforging. With this method it is possible to produce thick-walled hollow aluminum profiles with undercuts without complex tool kinematics. The forging is supported by an active medium. A tool concept has been developed that uses the drives of a hydraulic press with die cushion. With this tool various component geometries were produced and analysed. To produce the tools interior pressure and the forming pressure liquid tin as incompressible active medium was used. The forming is initiated by an upsetting of the aluminum profiles and supported by the active medium, so that the profile is pushed against the engraving of the dies. The process was designed based on simulations and verified by practical experiments. This paper describes the development of the forging process with active medium and the discussion of the forging experiment results.

Research on Prediction of High-Speed Rail Trains Delay Time

CICTP 2020 ◽  
2020 ◽  
Author(s):  
Jing Shi ◽  
Qiyuan Peng ◽  
Ling Liu
Keyword(s):  
Delay Time ◽  
High Speed ◽  
High Speed Rail

CYCLOPS BHT

Alloy Digest ◽  
1965 ◽  
Vol 14 (2) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Elevated Temperature ◽  
High Speed ◽  
High Speed Steel ◽  
High Strength ◽  
Heat Treating ◽  
High Load ◽  
Structural Components ◽  
Temperature Performance

Abstract Cyclops BHT is a low-alloy martensitic high-speed steel of the molybdenum type recommended for high strength, high load structural components designed for elevated temperature service. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-173. Producer or source: Cyclops Corporation.

VASCO M-50

Alloy Digest ◽  
1974 ◽  
Vol 23 (11) ◽  
Keyword(s):  
Elevated Temperature ◽  
Physical Properties ◽  
Surface Treatment ◽  
High Speed ◽  
High Speed Steel ◽  
High Strength ◽  
Heat Treating ◽  
High Load ◽  
Aisi 52100 ◽  
Aisi 52100 Steel

Abstract VASCO M-50 is a hardenable (martensitic), low-alloy high-speed steel developed primarily for high-strength, high-load components (such as bearings and gears) designed for elevated-temperature service. It may be used at temperatures up to 600 F; this is in contrast to AISI 52100 steel which may be used up to only 350 F. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, machining, joining, and surface treatment. Filing Code: TS-278. Producer or source: Teledyne Vasco.

THE HIGH-SPEED RAIL HANDBOOK: A TECHNICAL GUIDE1

2018 ◽  
Vol 8 (3) ◽  
pp. 515-530
Author(s):  
Massimo Zucchetti1,2 ◽  
◽  
Keyword(s):  
High Speed ◽  
High Speed Rail

High-Speed Rail Networks, Capacity Investments and Social Welfare

2019 ◽  
Author(s):  
Valentina Bracaglia ◽  
Tiziana D'Alfonso ◽  
Alberto Nastasi ◽  
Dian Sheng ◽  
Yulai Wan ◽  
...  
Keyword(s):  
Social Welfare ◽  
High Speed ◽  
High Speed Rail
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