scholarly journals Friction-Induced Recycling Process for User-Specific Semi-Finished Product Production

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 663
Author(s):  
Thomas Borgert ◽  
Werner Homberg
Keyword(s):  
High Efficiency ◽  
Research Work ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Efficient Production ◽  
Secondary Aluminum ◽  
Shape Accuracy ◽  
Aluminum Chips ◽  
Spinning Process ◽  
Complex Parts

Modern forming processes often allow today the efficient production of complex parts. In order to increase the sustainability of forming processes it would be favorable if the forming of workpieces becomes possible using production waste. At the Chair of Forming and Machining Technology of the Paderborn University (LUF) research is presently conducted with the overall goal to produce workpieces directly from secondary aluminum (e.g., powder and chips). Therefore, friction-based forming processes like friction spinning (or cognate processes) are used due to their high efficiency. As a pre-step, the production of semi-finished parts was the subject of accorded research work at the LUF. Therefore, a friction-based hot extrusion process was used for the full recycling or rework of aluminum chips into profiles. Investigations of the recycled semi-finished products show that they are comparable to conventionally produced semi-finished products in terms of dimensional stability and shape accuracy. An analysis of the mechanical properties of hardness and tensile strength shows that a final product with good and homogeneously distributed properties can be produced. Furthermore, significant correlations to the friction spinning process could be found that are useful for the above-mentioned direct part production from secondary aluminum.

Influences of Heat Treatment on Spinning Process with Large Thinning Rate and Performance of 30CrMnSiA

2012 ◽  
Vol 160 ◽  
pp. 97-102 ◽  
Author(s):  
Dong Han ◽  
He Yang ◽  
Mei Zhan ◽  
Ming Yang Yang ◽  
Shao Zheng Mou ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Annealing Process ◽  
Shape Accuracy ◽  
Spinning Process ◽  
Forming Efficiency ◽  
Thin Walled ◽  
And Performance ◽  
Lower Ratio ◽  
Thinning Rate

In order to improve the limits of wall thickness reduction of 30CrMnSiA steel in process of spinning, realize multi-pass continuous spinning process, and furthermore improve the forming efficiency and shape accuracy of thin-walled shell of 30CrMnSiA steel in spinning process, the influence of traditional annealing and austenization plus spheroidal annealing on the structure performance of 30CrMnSiA steel and the spun performance of 30CrMnSiA steel are studied. Process parameters of traditional anneal and austenize plus spheroidal annealing are optimized to obtain higher plastic performance and lower ratio of yield strength to tensile strength. Spinning experiments of the workpieces that have been heattreated by the optimized traditional annealing process and austenization plus spheroidal process are completed. The result shows that the optimized austenization plus spheroidal annealing is beneficial to achieve a large thinning rate for flow spinning process, and can meet the demands of low cost and high efficiency of batch production.

Improving the Surface Characteristics by Employing FSP on the Composites for the Automobile Brake Pad Application

2019 ◽  
Author(s):  
P. Ashwath ◽  
M. Anthony Xavior ◽  
R. Rajendran
Keyword(s):  
Surface Characterization ◽  
Research Work ◽  
Hot Extrusion ◽  
Surface Characteristics ◽  
Extrusion Process ◽  
Wear Loss ◽  
Brake Disc ◽  
Brake Pad ◽  
Brake Pads ◽  
Friction Stir

Abstract Looking at the background of the recent research on the area of the brake friction materials, composites are gaining the trust in being a potential replacement among the automobile sectors. The fabrication of the AA 2024 composites reinforced with 3 wt % Al2O3 is done using powder metallurgy technique followed by hot extrusion process. Current research work focuses on friction stir processed surface modified composites evaluated for the replacement of the currently used brake pads materials in automobile sectors. Surface characterization is carried out on the worn-out tracks of both brake materials developed and the counterpart employed using scanning electron microscope and XRD. The counterpart used in pin on disc configuration is exactly the material used in the automobile application (i.e. automobile brake disc plate material). Impact characteristics and tensile studies after friction stir processing (FSP) is studied as well. Coefficient of friction and wear loss characteristics in aspect of the tribological life of the composites developed is compared with the existing automobile brake pad components and found that FSP on composites served the purpose of the materials used in existing brake pads material.

Effect of Hot Extrusion Parameters on Tensile Strength and Fracture Behavior in Direct Recycling of Aluminium Alloy (6061) Chips

2020 ◽  
Vol 975 ◽  
pp. 229-234
Author(s):  
Mohammed H. Rady ◽  
Mohammad Sukri Mustapa ◽  
Shazarel Shamsudin ◽  
Mohd Amri Lajis ◽  
Mohd Idrus Mohd Masirin ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Optimum Condition ◽  
Fracture Behavior ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
High Tensile Strength ◽  
Preheating Temperature ◽  
Aluminum Chips ◽  
Full Factorial ◽  
Alloy 6061

Produced Profiles by direct recycling of aluminum chips in hot extrusion process were achieved by temperature related parameters using preheating temperature 450 °C, 500 °C, and 550 °C for duration 1 hour, 2 hours, and 3 hours preheating time. By using Design of Experiments (DOE) procedure with full factorial design and three center points analysis, the results showed that the preheating temperature factor is more important to be controlled rather than the preheating duration and increase of temperature conducted to the high tensile strength. The profiles extruded at 550 °C and 3 hours’ duration had obtained the optimum condition to get the maximum tensile strength. The influence of parameters of hot extrusion process on fracture surfaces of the recycled samples was also investigated and discussed.

Hot Extrusion of Thin-Wall Multichannel Copper Profiles

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
Frank F. Kraft ◽  
Jonathan Kochis
Keyword(s):  
Heat Exchangers ◽  
High Efficiency ◽  
Hot Extrusion ◽  
Cold Drawing ◽  
Extrusion Process ◽  
Thin Wall ◽  
Channel Design ◽  
Extrusion Dies ◽  
Computer Controlled ◽  
Isothermal Extrusion

This paper presents the development of a unique, net shape, hot-extrusion process to produce precision, thin-wall, multichannel copper profiles for high efficiency heat-exchangers. This process is a departure from conventional copper extrusion, which is a nonisothermal process used primarily to produce simple semifinished products and hollow profiles requiring cold drawing after hot extrusion. A lab-scale apparatus was developed to simultaneously extrude multiple heated billets through a porthole type hollow die to form the multi-channel profiles. The process is performed at 700–750 °C, essentially at isothermal extrusion conditions. Temperature and tooling strength considerations necessitated the use of superalloys for the apparatus (which included dies, container, ram stems, and support tooling). A 250 kN computer controlled servo-hydraulic MTS® machine was used to provide the extrusion ram force. Two part designs were extruded to demonstrate process feasibility and versatility. A two-channel design with 0.2 mm wall thicknesses and an 11-channel design with wall-thicknesses of 0.3 mm were extruded. The extrusion ratios for these profiles are 67 and 25, respectively. Experimental data and an approach to analytically model the process are presented. Because solid-state welds in the tube walls are necessitated by the use of hollow extrusion dies, the microstructure in these regions is also presented.

Influences of Heat Treatment on Spinning Process with Large Thinning Rate and Performance of 30CrMnSiA

2012 ◽  
Vol 214 ◽  
pp. 395-400
Author(s):  
Dong Han ◽  
He Yang ◽  
Mei Zhan ◽  
Ming Yang Yang ◽  
Shao Zheng Mou ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Annealing Process ◽  
Shape Accuracy ◽  
Spinning Process ◽  
Forming Efficiency ◽  
Thin Walled ◽  
And Performance ◽  
Lower Ratio ◽  
Thinning Rate

In order to improve the limits of wall thickness reduction of 30CrMnSiA steel in process of spinning, realize multi-pass continuous spinning process, and furthermore improve the forming efficiency and shape accuracy of thin-walled shell of 30CrMnSiA steel in spinning process, the influence of traditional annealing and austenization plus spheroidal annealing on the structure performance of 30CrMnSiA steel and the spun performance of 30CrMnSiA steel are studied. Process parameters of traditional anneal and austenize plus spheroidal annealing are optimized to obtain higher plastic performance and lower ratio of yield strength to tensile strength. Spinning experiments of the workpieces that have been heattreated by the optimized traditional annealing process and austenization plus spheroidal process are completed. The result shows that the optimized austenization plus spheroidal annealing is beneficial to achieve a large thinning rate for flow spinning process, and can meet the demands of low cost and high efficiency of batch production.

scholarly journals A Review on Recycling Aluminum Chips by Hot Extrusion Process

Procedia CIRP ◽  
2015 ◽  
Vol 26 ◽  
pp. 761-766 ◽  
Author(s):  
S.N. Ab Rahim ◽  
M.A. Lajis ◽  
S. Ariffin
Keyword(s):  
Hot Extrusion ◽  
Extrusion Process ◽  
Aluminum Chips

Effect of Heat Treatment on Tensile Strength of Direct Recycled Aluminium Alloy (AA6061)

2019 ◽  
Vol 961 ◽  
pp. 80-87
Author(s):  
Mohammad Hussein Rady ◽  
Ahmed Sahib Mahdi ◽  
Mohammad Sukri Mustapa ◽  
Shazarel Shamsudin ◽  
Mohd Amri Lajis ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Solid State ◽  
Aging Process ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
High Tensile Strength ◽  
Quenching Temperature ◽  
Preheating Temperature ◽  
Aluminum Chips

Products by solid-state recycling of aluminum chips in hot extrusion process were controlled by temperature related parameters using preheating temperature 450 °C, 500 °C, and 550 °C for 1 hr, 2 hr, and 3 hr preheating time. By using Design of Experiments (DOE), the results found that the preheating temperature is more important to be controlled rather than the preheating time and increasing of temperature led to the high tensile strength. The profile extruded at 550 °C with 3 hr duration had gained the optimum case to get the maximum tensile strength. For the optimum case, heat treatment was carried out using quenching temperature at 530 oC for 2 h and aging process at 175 oC for 4 h. The tensile strength of extrudes specimen was improved significantly compared to those of non-treated specimen.

Software Tool Used for Simulation of Metal Spinning Process for Complex Rotational Parts

2014 ◽  
Vol 657 ◽  
pp. 153-157
Author(s):  
Traian Cioca ◽  
Gheorghe Oancea ◽  
Alexandru Catalin Filip
Keyword(s):  
High Efficiency ◽  
Software Tool ◽  
Manufacturing Method ◽  
Small Series ◽  
Spinning Process ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Metal Spinning ◽  
Original Application ◽  
Complex Parts

Metal spinning on NC machine-tools is a very flexible and complex manufacturing method which has a high efficiency for small series of parts and prototype parts. The algorithms used for calculating the roller trajectory during the metal spinning process are usually complicated and hard to apply into production. This article presents an original application developed using Visual LISP that can be used for calculating and then simulating and testing the roller trajectory in the case of manufacturing rotational complex parts by metal spinning. The simulation prevents any errors that can occur during the process of manufacturing before the parts are actually put into production.

Piezoelectric β-polymorph formation of new textiles by surface modification with coating process based on interfacial interaction on the conformational variation of poly (vinylidene fluoride) (PVDF) chains

2020 ◽  
Vol 91 (3) ◽  
pp. 31301
Author(s):  
Nabil Chakhchaoui ◽  
Rida Farhan ◽  
Meriem Boutaldat ◽  
Marwane Rouway ◽  
Adil Eddiai ◽  
...  
Keyword(s):  
High Efficiency ◽  
Vinylidene Fluoride ◽  
Research Work ◽  
Research Area ◽  
Interfacial Interaction ◽  
Tetraethyl Orthosilicate ◽  
Poly Vinylidene Fluoride ◽  
Carbon Nanofillers ◽  
The Impact ◽  
Advanced Applications

Novel textiles have received a lot of attention from researchers in the last decade due to some of their unique features. The introduction of intelligent materials into textile structures offers an opportunity to develop multifunctional textiles, such as sensing, reacting, conducting electricity and performing energy conversion operations. In this research work nanocomposite-based highly piezoelectric and electroactive β-phase new textile has been developed using the pad-dry-cure method. The deposition of poly (vinylidene fluoride) (PVDF) − carbon nanofillers (CNF) − tetraethyl orthosilicate (TEOS), Si(OCH2CH3)4 was acquired on a treated textile substrate using coating technique followed by evaporation to transform the passive (non-functional) textile into a dynamic textile with an enhanced piezoelectric β-phase. The aim of the study is the investigation of the impact the coating of textile via piezoelectric nanocomposites based PVDF-CNF (by optimizing piezoelectric crystalline phase). The chemical composition of CT/PVDF-CNC-TEOS textile was detected by qualitative elemental analysis (SEM/EDX). The added of 0.5% of CNF during the process provides material textiles with a piezoelectric β-phase of up to 50% has been measured by FTIR experiments. These results indicated that CNF has high efficiency in transforming the phase α introduced in the unloaded PVDF, to the β-phase in the case of nanocomposites. Consequently, this fabricated new textile exhibits glorious piezoelectric β-phase even with relatively low coating content of PVDF-CNF-TEOS. The study demonstrates that the pad-dry-cure method can potentially be used for the development of piezoelectric nanocomposite-coated wearable new textiles for sensors and energy harvesting applications. We believe that our study may inspire the research area for future advanced applications.

Analysis and optimization of hot extrusion process on strenx steel 900

2021 ◽  
Author(s):  
A. Damodar Reddy ◽  
P.N. Karthikeyan ◽  
S. Krishnaraj ◽  
Adarsh Ajayan ◽  
K. Sunil Kumar Reddy ◽  
...  
Keyword(s):  
Hot Extrusion ◽  
Extrusion Process
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