scholarly journals Hybrid manufacturing of sheet metals and functionalizing for joining applications via hole flanging

2021 ◽  
Author(s):  
Markus Bambach ◽  
Ismail Ünsal ◽  
Alexander Sviridov ◽  
Rebar Hama-Saleh ◽  
Andreas Weisheit
Keyword(s):  
Hybrid Manufacturing ◽  
Body Parts ◽  
Laser Metal Deposition ◽  
Innovative Strategy ◽  
Sheet Metal Parts ◽  
Via Hole ◽  
Mechanical And Microstructural Properties ◽  
Bolt Connection ◽  
Hole Flanging ◽  
Forming Methods

AbstractEfficient lightweight solutions are of great interest in many industries (aviation, automotive) particularly regarding the limitation of CO$$_2$$ 2 -emissions and material waste. An innovative strategy to address these challenges is the use of hybrid manufacturing. Additive manufacturing (laser metal deposition, LMD) and conventional forming methods (hole-flanging) are used to optimize and functionalize AA 6016 sheet metal parts, which are widely used in the manufacturing of car body parts. First of all, the effects of the additive reinforcements on the mechanical and microstructural properties are investigated using tensile and microstructural tests. After manufacturing reinforced blanks and performing subsequent forming operations, the parts are investigated regarding damages and functionalized through threading. This allows the application of a bolt connection, which is tested through rip-off tests to evaluate the effect of the reinforcements on the fracture forces. It can be shown, that reinforcements can be manufactured without defects and virtually no porosity and the formability is only slightly reduced compared to conventional materials. At the same time, the performance of the reinforced bolt joint can be enhanced while the increase in weight can be limited to relatively small amounts.

scholarly journals Hybrid manufacturing of titanium Ti-6Al-4V combining laser metal deposition and cryogenic milling

2020 ◽  
Vol 107 (7-8) ◽  
pp. 2995-3009 ◽  
Author(s):  
Juliane Moritz ◽  
André Seidel ◽  
Michael Kopper ◽  
Jörg Bretschneider ◽  
Johannes Gumpinger ◽  
...  
Keyword(s):  
Metal Deposition ◽  
Hybrid Manufacturing ◽  
Laser Metal Deposition ◽  
Cryogenic Milling

Minimizing assembly variation in selective assembly for auto-body parts based on IGAOT

2018 ◽  
Vol 11 (2) ◽  
pp. 254-268 ◽  
Author(s):  
Yanfeng Xing ◽  
Yansong Wang
Keyword(s):  
Genetic Algorithm ◽  
Sheet Metal ◽  
Rigid Bodies ◽  
Influence Coefficient ◽  
Body Parts ◽  
Selective Assembly ◽  
Improved Genetic Algorithm ◽  
Content Type ◽  
Sheet Metal Parts ◽  
Assembly Tolerance

PurposeDimensional quality of sheet metal assemblies is an important factor for the final product. However, the part tolerance is not easily controlled because of the spring back deformation during the stamping process. Selective assembly is a means to decrease assembly tolerance of the assembly from low-precision components. Therefore, the purpose of this paper is to propose a fully efficient method of selective assembly optimization based on an improved genetic algorithm for optimization toolbox (IGAOT) in MATLAB.Design/methodology/approachThe method of influence coefficient is first applied to calculate the assembly variation of sheet metal components since the traditional rigid assembly variation model cannot be used due to welding deformation. Afterwards, the IGAOT is proposed to generate optimal selective groups, which consists of advantages of genetic algorithm for optimization toolbox (GAOT) and simulated annealing.FindingsThe cases of two simple planes and the tail lamp bracket assembly are used to illustrate the flowchart of optimizing combinations of selective groups. These cases prove that the proposed IGAOT has better precision than that of GAOT with the same parameters for selective assembly.Originality/valueThe research objective of this paper is to evaluate the changes from rigid bodies to sheet metal parts which are very complex for selective assembly. The method of IGAOT was proposed to the selected groups which has better precision than that of current optimization algorithms.

scholarly journals TENDENCIES IN FORMING SHEET METAL PARTS USING INCREMENTAL FORMING ADVANCED TECHNOLOGIES

2019 ◽  
Vol 25 (3) ◽  
Author(s):  
CATALINA CIOFU ◽  
BOGDAN CHIRITA ◽  
ROXANA LUPU ◽  
COSMIN GRIGORAS ◽  
CRINA RADU ◽  
...  
Keyword(s):  
Sheet Metal ◽  
Incremental Forming ◽  
Stretch Forming ◽  
Micro Forming ◽  
Forming Process ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Advanced Technologies ◽  
Metal Materials ◽  
Forming Methods

Stretch forming of sheet metal materials is a highly required process in aerospace industry for manufacturing skin parts. Automation of some processes such as cutting, punching, forming, shearing and nesting in conventional manufacturing tends to combine these forming methods. Some researches are made on the formability of sheet metal materials obtained in incremental forming process with stretch forming and water jet incremental micro-forming with supporting dies. This paper is an attempt to review the newly researches made on optimization of manufacturing metal skin parts to achieve geometrical accuracy.

scholarly journals TENDENCIES IN FORMING SHEET METAL PARTS USING INCREMENTAL FORMING ADVANCED TECHNOLOGIES

2019 ◽  
Vol 25 (3) ◽  
pp. 15-21
Author(s):  
CATALINA CIOFU ◽  
BOGDAN CHIRITA ◽  
ROXANA LUPU ◽  
COSMIN GRIGORAS ◽  
CRINA RADU ◽  
...  
Keyword(s):  
Sheet Metal ◽  
Incremental Forming ◽  
Stretch Forming ◽  
Micro Forming ◽  
Forming Process ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Advanced Technologies ◽  
Metal Materials ◽  
Forming Methods

Stretch forming of sheet metal materials is a highly required process in aerospace industry for manufacturing skin parts. Automation of some processes such as cutting, punching, forming, shearing and nesting in conventional manufacturing tends to combine these forming methods. Some researches are made on the formability of sheet metal materials obtained in incremental forming process with stretch forming and water jet incremental micro-forming with supporting dies. This paper is an attempt to review the newly researches made on optimization of manufacturing metal skin parts to achieve geometrical accuracy.

scholarly journals Comparison of Substrate Preheating on Mechanical and Microstructural Properties of Hybrid Specimens Fabricated by Laser Metal Deposition 316 L with Different Wrought Steel Substrate

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 891
Author(s):  
Yuhui Zhao ◽  
Zhiguo Wang ◽  
Jibin Zhao ◽  
Zhenfeng He ◽  
Hongwei Zhang
Keyword(s):  
Steel Substrate ◽  
Interfacial Microstructure ◽  
Metal Deposition ◽  
Laser Metal Deposition ◽  
Adhesion Properties ◽  
Substrate Preheating ◽  
The Difference ◽  
Mechanical And Microstructural Properties ◽  
1045 Steel ◽  
Deposition Height

The combination of additive manufacturing and conventional metal forming processes provides the possibility for improvements of forming efficiency and flexibility. Substrate preheating is an implementable technique to improve the interface adhesion properties of the hybrid forming method. The present experiment investigates the adhesion of additive manufactured 316 L steel on P20 and 1045 steel substrates under two substrate temperatures, and the geometrical characterization, interfacial microstructure and mechanical property of the hybrid specimens were compared. As a result, it was found that the ratio of deposition height to the width was reduced and the width was increased under substrate preheating. Tensile results show that the ultimate strength of 1045 and 316 L hybrid specimens was obviously increased, while the properties of hybrid specimens P20 and 316 L were similar, under different substrate temperature conditions. For the hybrid specimens with the metallurgically bonding characteristic, the tensile properties can reach the level of 316 L depositioned specimens fabricated by laser metal deposition (LMD). Furthermore, substrate preheating had little effect on the microstructure of the laser metal deposition zone, and significant influence on the microstructure of the heat affected zone, which was reflected in the difference of the hardness distribution.

A new assembly variation analysis model based on the method of power balance for auto-body parts

2014 ◽  
Vol 34 (3) ◽  
pp. 296-302 ◽  
Author(s):  
Yanfeng Xing ◽  
Yansong Wang
Keyword(s):  
Sheet Metal ◽  
Power Balance ◽  
Influence Coefficient ◽  
Body Parts ◽  
Variation Analysis ◽  
Analysis Model ◽  
Content Type ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Auto Body

Purpose – The purpose of this paper is to propose a new assembly variation analysis model to analyze assembly variation for sheet metal parts. The main focus is to analyze assembly processes based on the method of power balance. Design/methodology/approach – Starting with issues in assembly variation analysis, the review shows the critical aspects of tolerance analysis. The method of influence coefficient (MIC) cannot accurately analyze the relationship between part variations and assembly variations, as the welding point is not a point but a small area. Therefore, new sensitivity matrices are generated based on the method of power balance. Findings – Here two cases illustrate the processes of assembly variation analysis, and the results indicate that new method has higher accuracy than the MIC. Research limitations/implications – This study is limited to assembly variation analysis for sheet metal parts, which can be used in auto-body and airplane body. Originality/value – This paper provides a new assembly variation analysis based on the method of power balance.

scholarly journals COMPENSATION OF SPRINGBACK IN LARGE SHEET METAL FORMING

2019 ◽  
Vol 59 (5) ◽  
pp. 483-489
Author(s):  
Tomáš Pačák ◽  
František Tatíček ◽  
Michal Valeš
Keyword(s):  
Sheet Metal ◽  
Current Approach ◽  
Geometrical Shape ◽  
Body Parts ◽  
Car Body ◽  
Sheet Metal Parts ◽  
The Press ◽  
Automotive Production ◽  
Large Sheet

A precise production of sheet metal parts has always been a main goal in press shops. Highest quality demands are required especially in automotive production. Unfortunately, even today, the production is not optimal due to an ineffective approach to the springback compensation. Springback results in geometrical shape inaccuracies of the obtained product. Based on the current approach, excessive time and financial costs emerge due to corrections on the press tools. However, these corrections do not always lead to a better accuracy of the stampings. The main objective of the research is to design a modified solution of the current approach. The modified solution is designed as a methodology with a focus on the analysis and compensation of the springback with a help of a numerical simulation. To achieve the main goal, smaller sub-goals are employed. These sub-goals, or rather experiments, mainly focus on parameters, which, more or less, influence the springback phenomenon. The designed methodology is verified with real car body parts and is carried out with a help of the department of the press tools design in ŠKODA AUTO, a.s. There, the methodology is used for improving the accuracy of the stamping process of the car body parts and for improving the quality of the final product.

Spiritual enhanced drug addiction rehabilitation (SEDAR) program: An innovative strategy for increase coverage of methadone program in Malaysia

2011 ◽  
Vol 26 (S2) ◽  
pp. 100-100
Author(s):  
A.R. Rusdi ◽  
R. Noorzurani ◽  
H. Hussain
Keyword(s):  
Drug Users ◽  
Methadone Maintenance ◽  
Retention Rate ◽  
Hospital Setting ◽  
Hiv Risk Behavior ◽  
Body Parts ◽  
Innovative Strategy ◽  
Therapy Program ◽  
Outcomes Measures ◽  
Time Period

IntroductionIn Malaysia, national methadone maintenance therapy program was started by the goverment in October 2005 as part of harm reduction approach in reducing HIV prevalence among drug users along with needles and Syringes exchange(NSEP) program. However, slow coverage of MMT treatment occurs due to limited resources in existing health facilities and lack of participation from general practioners(Gps). There is a need for another paltform to increase coverage and participation of GPs in national MMT program.ObjectivesTo compare the retention rate and other outcomes measures between SEDAR program and Standard MMT treatment in hospital.AimsTo determine the feasability of MMT program in mosque environment.MethodsThe pilot MMT program known as SEDAR program was conducted in Ar-Rahman mosque involving 30 clients. Brief spiritual intervention(BSI) was given by mosque staffs on top of standard MMT treatment counseling. BSI include washing body parts with water or “wuduk”, praying in the mosque or “tahiyatul masjid” and recite “doa” in the mosque environment prior to direct observed therapy of methadone in the mosque by the pharmacist. The retention rate, % of urine drugs negative over time period, drug use and HIV risk behavior, quality of live and spiritual progress were measure using specific tools: OTI, WHO Qol, SF36, HIR96.ResultsWe expect the SEDAR group in Mosque has better outcomes or comparable with standard MMT treatment in hospital setting.ConclusionsThe SEDAR program is feasable to increase coverage of MMT program in Malaysia.

Body Parts Satisfaction Scale–Revised

2002 ◽  
Author(s):  
Trent A. Petrie ◽  
Margaret M. Tripp ◽  
Pejcharat Harvey
Keyword(s):  
Body Parts ◽  
Satisfaction Scale
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