Temperature-Supported Forming of Automobile Related Magnesium Components

2013 ◽  
Author(s):  
Frank Schieck ◽  
Welf-Guntram Drossel ◽  
Hans Bräunlich ◽  
Sören Scheffler ◽  
Norbert Pierschel
Keyword(s):  
Lightweight Design ◽  
Construction Materials ◽  
Passenger Cars ◽  
Forming Simulation ◽  
Forming Technology ◽  
Related Part ◽  
Tailored Blanks ◽  
Application Potential ◽  
High Level ◽  
Forming Tools

Lightweight design in passenger cars is gaining more and more importance. Independent from conventionally or electrically drive train concepts, weight reduction is one of the most rated defining variables for fuel or energy consumption, thus affecting the range of the vehicle. Overall, the potential for using steel in lightweight bodywork construction has attained a high level of development with the result that the potential for further optimisation is increasingly diminishing. As a consequence, alternative lightweight construction materials are set to become more important in the future. Compared to the beneficial application potential regarding bending and distortion of steel- and Aluminium compared to Magnesium blanks, this material becomes more and more interesting for automobile applications. Beside challenges like corrosion and recycling, mainly an appropriate forming technology lies in the focus of investigations. Due to the insufficient forming conditions of Magnesium at room temperature the focus of investigation was related to the characterisation of material properties depending on temperature, the thermo-mechanical forming simulation for process and tool design and the practical realisation of complex, car-related part geometries as well as requirements for forming tools and additional devices. In the following article we will present the results of studies into the forming of magnesium sheets (AZ31) including tailored blanks, achieved within a growth cell (TeMaK and TeMaK+).

Hohl-Quer-Fließpressen mit geregelten Querstempeln*/Hollow lateral extrusion with controlled counterpunches - Improving the branches’ form accuracy by a superposition of a hydrostatic pressure on the forming zone

2015 ◽  
Vol 105 (10) ◽  
pp. 697-703
Author(s):  
J. Wälder ◽  
A. Felde ◽  
M. Liewald ◽  
O. Napierala ◽  
M. Haase ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Metal Forming ◽  
Feasibility Studies ◽  
Drive Train ◽  
Lightweight Construction ◽  
Form Accuracy ◽  
Lateral Extrusion ◽  
Forming Technology ◽  
New Process ◽  
High Level

Als Beitrag zur Gewichtsreduktion von Komponenten im Antriebsstrang moderner PKWs wird am IFU Stuttgart und am IUL Dortmund ein neues Verfahren zur Herstellung hohler Bauteile mittels Querfließpressen entwickelt. Aufbauend auf ersten Machbarkeitsuntersuchungen werden in dieser Veröffentlichung Maßnahmen gezeigt, mit denen das herstellbare Geometriespektrum hinsichtlich der Verfahrensgrenze gegen Risse erweitert sowie eine Verbesserung der Formabweichung erreicht werden kann.   As a contribution towards a reduction in weight of automotive drive train components, a new process for producing hollow components by lateral extrusion is being developed at the Institute for Metal Forming Technology (IFU) in Stuttgart and the Institute of Forming Technology and Lightweight Construction (IUL) in Dortmund. Based upon first feasibility studies, methods are shown in this publication to extend the spectrum of the producible geometries and to achieve a high level of form accuracy.

An iterative approach for the determination of tailored blanks for waste-free composite forming by means of FE forming simulation

2017 ◽  
Vol 3 (2/3/4) ◽  
pp. 323 ◽  
Author(s):  
Dominik Dörr ◽  
Lukas Lipowsky ◽  
Fabian J. Schirmaier ◽  
Luise Kärger ◽  
Frank Henning
Keyword(s):  
Iterative Approach ◽  
Forming Simulation ◽  
Composite Forming ◽  
Tailored Blanks

scholarly journals COMBINATORY APPROACH TO FAILURE FINDING IN PASSENGER CAR ELECTRICAL EQUIPMENT SYSTEM

2021 ◽  
Vol 1 (38) ◽  
pp. 185-193
Author(s):  
A. Lovska ◽  
O. Fomin ◽  
D. Skurikhin ◽  
V. Bondarenko
Keyword(s):  
Electrical Equipment ◽  
Technical Diagnostics ◽  
Passenger Cars ◽  
Passenger Car ◽  
Electrical Systems ◽  
Critical Elements ◽  
Protection Devices ◽  
Monitoring And Diagnostics ◽  
High Level ◽  
Equipment System

Maintaining a high level of maintenance of electrical equipment in passenger cars requires research in the field of improving methods and means of technical diagnostics. Electronic devices for automatic control and protection, which are located in the switchboard of the car, are one of the most critical elements in the electrical equipment system, ensuring its reliable, efficient and safe operation. If the automatic adjustment and protection devices are out of regulation during operation, the voltage and current in the electrical equipment network may exceed the permissible level, which leads to the failure of electricity consumers, a battery and a generator. In addition, the semiconductor devices themselves are very sensitive to short-term overloads, in which, even with minor overloads, a breakdown or breakage of the conductive layer occurs. Modern trends in the development of passenger car fleet indicate a sharp increase in the complexity of the element base of cars. This mainly concerns the electrical systems of cars, where all the functions of control, monitoring and diagnostics are performed by electronics. Maintaining a high level of service for such systems requires research in the field of improving methods and means of technical diagnostics. For these purposes, the authors have developed a method for constructing optimal control and diagnostic tests, which is based on a combinatorial approach. The method is easily implemented on a computer.

scholarly journals Topology Optimization and Lightweight Design of Stamping Dies for Forming Automobile Panels

2021 ◽  
Author(s):  
Ting Su ◽  
Tao He ◽  
Renqi Yang ◽  
Maojun Li
Keyword(s):  
Topology Optimization ◽  
Stress Distribution ◽  
Lightweight Design ◽  
Structural Safety ◽  
Time Saving ◽  
Forming Simulation ◽  
Structure Topology ◽  
Stamping Die ◽  
Structure Reliability ◽  
Manufacturing Techniques

Abstract The accurate prediction of deformation and stress distribution on the stamping die components is critical to guarantee structure reliability and lightweight design. This work aims to propose a new method based on numerical simulation for predicting die structural behaviors and reducing total weight. The sheet metal forming simulation was firstly conducted to obtain the accurate forming contact force during stamping process. The linear static structural analysis with different load cases was then performed to investigate the deformation and stress distribution on die structure. Topology optimization was employed to realize lightweight design while ensuring structural safety. Redesign process for die structures was conducted according to both manufacturing techniques and initial optimized results to guarantee the manufacturability of new structures. The proposed methodology has several advantages of decreasing model scale, precluding intricate contact condition settings as well as time-saving. A long beam stamping die used for forming automobile panels was selected to validate the proposed methodology, and around 18% weight reduction was achieved.

scholarly journals COMPOSITE MATERIALS BASED ON CEMENT BINDERS MODIFIED WITH SiO2 NANOADDITIVES

2017 ◽  
Vol 16 (6) ◽  
pp. 459-465
Author(s):  
B. M. Khroustalev ◽  
S. N. Leonovich ◽  
V. V. Potapov ◽  
E. N. Grushevskaya
Keyword(s):  
Corrosion Resistance ◽  
Materials Science ◽  
Ionic Composition ◽  
Construction Materials ◽  
Operational Reliability ◽  
Strength Development ◽  
Ultrasonic Processing ◽  
Structure And Properties ◽  
Urgent Task ◽  
High Level

Development of nanotechnologies allows to solve a number of problems of construction materials science: increase in strength, durability, abrasion and corrosion resistance that determines operational reliability of building constructions. Generally it is achieved due to nanoparticles that modify the structure and properties of the existing materials or products and are entered into their volume or on a surface layer. It’s theoretically and experimentally proved that the modified water has the bigger activity owing to the change of the ionic composition influencing the рН size and other parameters. As nanoparticles have a high level of surface energy, they show the increased tendency to agglomeration, meanwhile the size of agglomerates can reach several micrometers. In this regard an urgent task is to equally distribute and disaggregate the nanoparticles in the volume of tempering water. The experiments on studying of influence of the nanoparticles of silica distributed in volume of liquid by means of ultrasonic processing on characteristics of cement and sand solution and heavy concrete have been conducted. Nanoadditive influence on density, speed of strength development, final strength under compression of materials on the basis of cement depending on nanoadditive mass percent has been established.

Development of the Sound Metric for the Impact Sound of a Car Using Wavelet Transform

2009 ◽  
Author(s):  
Eun Woo Na ◽  
Ho-Wuk Kim ◽  
Sang Kwon Lee
Keyword(s):  
Wavelet Transform ◽  
Sound Level ◽  
Quality Characteristic ◽  
Subjective Rating ◽  
Passenger Cars ◽  
Impact Noise ◽  
The Mean ◽  
Sound Metric ◽  
High Level ◽  
The Impact

Vehicles experience the impact due to harsh road conditions. Contact with a barrier on a road induces vehicles to vibrate, which brings about impact noise of high sound level. The attenuation of impact noise is an important issue since car passengers may complain about the impact noise. However, Perfect removal of impact noise is not possible as most of impact noise is caused by external conditions. It is thus necessary to make vehicles to possess more desirable sound quality characteristic of impact sound. More research is needed on objective attributes of impact noise; it is not a simple matter since impact noise is transient in nature and has a high level of sound at an instantaneous moment. A new objective attribute of impact noise is designed by using wavelet transform. Wavelet transform is appropriate for the analysis of transient signals such as impact noise. The usefulness of new objective attribute, which is a sound metric, is examined by comparison with the mean subjective rating for real impact noise of passenger cars. The new sound metric has better correlation with the mean subjective rating than already existing sound metrics.

scholarly journals Approach for the Development of Forming Tools for Radial Rotation Profile-Forming

2019 ◽  
Vol 949 ◽  
pp. 125-133
Author(s):  
Robert Laue ◽  
Sebastian Härtel ◽  
Birgit Awiszus
Keyword(s):  
Radial Profile ◽  
Sheet Thickness ◽  
Forming Process ◽  
Process Step ◽  
Forming Simulation ◽  
General Law ◽  
Incremental Sheet Metal Forming ◽  
Metal Forming Process ◽  
Axial Profile ◽  
Forming Tools

The incremental forming process Radial Rotation Profile-Forming (RRPF) has been developed to enable the production of profiled hollow parts with low sheet thinning and high geometrical accuracy. As a result of low thinning, a smaller initial sheet thickness can be used, while material and weight can be saved.The two principal forming steps are the production of the preform by Rotational Swing-Folding (RSB) and the subsequent radial profile forming of the hollow part in one clamping position. The special feature are the purposed wrinkles in the first process step, which formed in the indentation of the profiled mandrel. This is an advantage, because of the additional thickening. Due to the radial profiled forming in the second process step, the axial profile can be formed with less thinning.The focus of the article is on the development of the forming tools for the second process step of RRPF. Based on the general law of gearing, the forming tools for the production of a component are developed. First, a forming simulation of an example component validates the approach. For this purpose, some simplifications have been made in order to consider the profile forming process separately. Afterwards, the experimental results of the incremental sheet metal forming process for the production of the profiled hollow parts are presented.

scholarly journals Design, Dimensioning and Simulation of Inerters for the Reduction of Vehicle Wheel Vibrations—Case Studies

Vehicles ◽  
2020 ◽  
Vol 2 (3) ◽  
pp. 424-437 ◽  
Author(s):  
Julian Borowski ◽  
Ralf Stetter ◽  
Stephan Rudolph
Keyword(s):  
Mechanical System ◽  
Reduction Potential ◽  
Mechanical Energy ◽  
Lightweight Design ◽  
Vibration Reduction ◽  
Race Car ◽  
Ground Pressure ◽  
Detailed Simulation ◽  
Application Potential ◽  
Wheel Vibration

For the last two decades, a novel mechanical system has received increasing attention—the inerter. An inerter is a system that can store mechanical energy for a rather short amount of time and behaves analogously to a capacitor in electrical engineering. Until today, only a few inerter applications have been reported. In a vehicle suspension, an inerter can be used to reduce wheel vibrations. This paper demonstrates the application potential of the novel mechanical system and describes the design and dimensioning of an inerter for the reduction of these kind of wheel vibrations for two completely different vehicle concepts. The first application concerns a Formula Student race car in which the main objective represents the maximization of the mechanical grip to improve lap times. For the inerter dimensioning in a racing car, lightweight design is a major issue. The second application is an agricultural tractor in which the focus is on the reduction of the ground pressure to protect the environment as well as on a very robust and compact realization of the inerter. A detailed simulation of both cases allows a qualitative and quantitative assessment of the wheel vibration reduction potential. In both applications, a considerable improvement potential could be identified which amounts, in the case of the race car, to a reduction of wheel oscillation of about 21% and for the tractor to a wheel vibration reduction potential of up to 54%.

Modern methods of treatment of patients with intolerance to dental construction materials

MedAlliance ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 80-89
Keyword(s):  
Construction Materials ◽  
Clinical Effectiveness ◽  
Tantalum Pentoxide ◽  
Psychological Status ◽  
Galvanic Current ◽  
Treatment Algorithms ◽  
Personal Anxiety ◽  
Resistance To Stress ◽  
High Level ◽  
Methods Of Treatment

Objective: to develop algorithms for treating patients with intolerance to dental construction materials (IDCM) and evaluate the clinical effectiveness of using an insula­ting coating of tantalum pentoxide (Ta2O5) on the surface of prosthetic constructions. Materials and methods. 552 patients (507 women and 45 men) with IDCM were examined. Basic and additional research methods were used, including exposure and provocative tests, epicutaneous and intraoral epimucous allergological tests, mea­surement of impedance and galvanic current, and assessment of the psychological status of patients. Results. The average number of comorbidities per person in patients with an allergy and a combination of several types of IDCM is significantly higher than in patients with galvanosis and toxic-chemical stomatitis (p<0.001). In patients with IDCM of an allergic nature and a combination of several types of IDCM, a direct correlation was found between the number of concomitant diseases per person and the probability of IDCM (r=0.614 and r=0.683, respectively, p<0.01). Concomitant pathology of organs and tissues of the oral cavity was detected in 39.49% of patients with IDCM. In 57.6% of cases, patients with IDCM showed a high level of personal anxiety (Spielberger–Khanin personal anxiety scale). 23.1% of patients had a high level of alexithymia (more than 74 points on the Toronto Alexithymia Scale). The method of determining stress resistance and social adap­tation of Holmes–Rahe showed low resistance to stress in 23.1% of patients with IDCM. Treatment algorithms for patients with IDCM take into account the need to correct comorbidities and are based on the principles of comple­xity, consistency, individuality, systematicity and continuity of treatment. Conclusion. The proposed algorithms for treating patients with IDCM have shown their clinical effectiveness. The use of Ta2O5 as an insulating coating for metal and acrylic prosthetic constructions is an effective method of prevention and treatment of IDCM.

Sign in / Sign up

Export Citation Format

Share Document