Experimental Research on Impact Line of Hyperboloid Shallow Shell

2010 ◽  
Vol 139-141 ◽  
pp. 567-570
Author(s):  
Li Hong Zhao ◽  
Zheng Yi Ren ◽  
Shu Yong Jiang ◽  
Nan Yang
Keyword(s):  
Process Conditions ◽  
Forming Process ◽  
Shape Accuracy ◽  
Test Analysis ◽  
Shallow Shells ◽  
Blank Holding Force ◽  
Auto Body ◽  
Design And Manufacture ◽  
The Impact

Impact line is one of important factors to affect the shape accuracy and surface quality of auto body panel design and manufacture. It is difficult to study because of the complexity shape of auto body panels. The system of test analysis on impact line is established by analyzing the shapes and forming processes of auto-body panels, of which based on hyperboloid shallow shells. The criterion and research technique of impact line are introduced. Extensive experiment results, which show the effects of forming process conditions, such as blank holding force, draw bead arrangement, and lubrication on impact line, are achieved. It can be concluded that the draw bead arrangement significantly influence the impact line, the displacement of impact line is different with difference of blank holding force and the friction coefficient.

Reach on Impact Line of Hyperboloid Shallow Shell Surface Deflection

2009 ◽  
Vol 628-629 ◽  
pp. 511-516 ◽  
Author(s):  
Li Hong Zhao ◽  
Y.F. Zheng ◽  
Zhong Wen Xing
Keyword(s):  
Finite Element ◽  
Sheet Thickness ◽  
Test Method ◽  
Element Analysis ◽  
Shallow Shells ◽  
Blank Holding Force ◽  
Simulation And Experiment ◽  
Auto Body ◽  
Automotive Panels ◽  
The Impact

The impact line is a remarkable disadvantage in the auto body panels forming. It is difficult to study because of the complexity shape of automotive panels. The finite element models of hyperboloid shallow shells that can represent automotive panels are established, and suitability of finite element analysis to induce the impact line of automotive panel is carried out. The experiment test method for determining impact line is presented also. The criterion and research technique of auto body panels impact line are introduced. The consistency of results of simulation and experiment shows that the numerical simulation on research of impact line is accurate and feasible. Finally, research works of simulation and experiment on controlling impact line measures are carried out: effects of blank holding force (BHF), sheet thickness and lubricating modes on the impact line are obtained.

Numerical Simulation on Drawing Deep of Cylindrical Pieces Based on Dynaform

2014 ◽  
Vol 684 ◽  
pp. 252-258 ◽  
Author(s):  
Jun Hong Wang ◽  
Xu Dong Bao ◽  
Hai Mei Feng ◽  
Chang Du
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Forming Process ◽  
Minimum Thickness ◽  
Optimum Parameters ◽  
Design And Manufacture ◽  
The Impact

Abstract: The design and manufacture of mold often rely on the experience of the designers, which led to the fact that the mold needs to be repeatedly debugged and corrected. Numerical simulation technology enables the simulation of the forming process of sheet metal and prediction of defects in design, thus to improve labor efficiency, save time and reduce costs. In this paper, the software Dynaform is used as a platform and a three-dimensional model is built to numerical simulate and analyze the drawing deep of a typical thin-walled cylindrical piece.Orthogonal experimentis adopted to analyze the impact of BHF, punching speed and punch-die gap on forming quality of the drawing pieces. With minimum thickness and wrinkling as indicators, the impact of various factors is analyzed and a set of optimum parameters is found out that is, BHF is 20kN, punching speed is 2000mm / s and punch-die gap is 0.9mm.

scholarly journals Mechatronic System’s Permeable Materials with Controlled Porosity

2021 ◽  
Vol 8 (1) ◽  
pp. C45-C49
Author(s):  
O. Povstyanoy ◽  
A. MacMillan
Keyword(s):  
Process Equipment ◽  
Mechatronic System ◽  
Porosity Distribution ◽  
Operational Characteristics ◽  
Controlled Porosity ◽  
Permeable Powder Material ◽  
Design And Manufacture ◽  
The Impact ◽  
Technical Products

Up-to-date directions in the development of modern industry increase the requirements for the quality of technical products. The design and manufacture of competitive process equipment require accuracy, productivity, and efficiency. Therefore, in this article, a new mechatronic system has been designed and developed to help porous, permeable materials with predicted porosity have been produced. The research aims to develop a mechatronic system for technology optimization in manufacturing permeable porous materials with controlled properties. As a result, the method of computer modeling of porous, permeable materials was developed. It allows us to consider the peculiarities of porosity distribution and radial velocity in radial isostatic compression. Additionally, a new mechatronic system for producing permeable materials allows us to determine the porosity distribution and particular characteristics of permeable powder material. The proposed approach allows us to evaluate the impact of technological modes on the main operational characteristics.

Experimental Research on the Stiffness of Hyperboloid Shallow Shell

2014 ◽  
Vol 940 ◽  
pp. 179-183
Author(s):  
Li Hong Zhao ◽  
Cheng Xi Lei ◽  
Zhong Wen Xing ◽  
Bin Wu
Keyword(s):  
High Strength ◽  
Process Conditions ◽  
Main Process ◽  
Technical Approach ◽  
Shallow Shells ◽  
Process Guidance ◽  
Experiment Method ◽  
Automobile Panel ◽  
Blank Holding Force ◽  
Panel Stiffness

Stiffness is a very important property of automobile panel, especially for high-strength thinning sheet due to personnel security and energy conservation on auto industry. It is difficult to study because of the complexity streamline feature of auto body. An experiment method for determining stiffness was presented. The experiment study models of which based on the hyperboloid shallow shells that could represent automobile panel’s surface features was established. The criterion and research technique of automobile panel stiffness were introduced. The experiment research works of effects of two main process conditions on stiffness which blank holding force (BHF) and boundary condition during the stiffness test were obtained. All conclusions provided a particularly effective process guidance and technical approach in the automobile panel production.

scholarly journals Processing and Structure of Carbon Nanofiber Paper

2009 ◽  
Vol 2009 ◽  
pp. 1-7 ◽  
Author(s):  
Zhongfu Zhao ◽  
Jihua Gou ◽  
Aurangzeb Khan
Keyword(s):  
Carbon Nanofibers ◽  
Acid Treatment ◽  
Carbon Nanofiber ◽  
Essential Element ◽  
Process Conditions ◽  
Processing Conditions ◽  
Different Types ◽  
Design And Manufacture ◽  
Dispersion Quality

A unique concept of making nanocomposites from carbon nanofiber paper was explored in this study. The essential element of this method was to design and manufacture carbon nanofiber paper with well-controlled and optimized network structure of carbon nanofibers. In this study, carbon nanofiber paper was prepared under various processing conditions, including different types of carbon nanofibers, solvents, dispersants, and acid treatment. The morphologies of carbon nanofibers within the nanofiber paper were characterized with scanning electron microscopy (SEM). In addition, the bulk densities of carbon nanofiber papers were measured. It was found that the densities and network structures of carbon nanofiber paper correlated to the dispersion quality of carbon nanofibers within the paper, which was significantly affected by papermaking process conditions.

Investigation on the Effect of Liquid Hammer Geometry to the Pressure Distribution of Innovative Hybrid Impact Hydroforming

2014 ◽  
Vol 941-944 ◽  
pp. 1843-1849 ◽  
Author(s):  
Murhaf Marai ◽  
Li Hui Lang ◽  
Shao Hua Wang ◽  
Li Jin Lin ◽  
Chun Lei Yang ◽  
...  
Keyword(s):  
Loading Condition ◽  
Experimental Approach ◽  
High Energy ◽  
Geometrical Shape ◽  
Wave Loading ◽  
Forming Process ◽  
Short Time ◽  
The Impact ◽  
Complex Parts

The innovative hybrid impact hydroforming (IHF) technology is a kind of high energy forming technique which can be used for forming complex parts with small features, such as convex tables, bars etc. which are widely employed in automotive and aircraft industries. The impact hydroforming technology means the most features are formed by hydroforming and the small features are rapidly reshaped by high intensity impact energy in a very short time after the traditional hydroforming. The impact pressure rises to the peak in 10ms which belongs to dynamic loading. The present work investigates IHF using a numerical /experimental approach. Finite element simulations using MSC.Patran were carried out changing the geometrical shape of liquid hammer.. Using this shock wave loading condition we did forming experiments. During forming process, stress distribution in the blank is comparatively better as compared with traditional methods so possibility of fracture is reduced. Inertia is also an important factor which affects control quality. Therefore, the research is very useful for improving forming quality of complicated products. It will be widely applied in automotive and aircraft industries.

Design and Manufacture of Vacuum Forming Moulds

2011 ◽  
Vol 264-265 ◽  
pp. 1500-1505
Author(s):  
Sumsun Naher ◽  
Paul Derham
Keyword(s):  
Proper Time ◽  
Air Pressure ◽  
Width Ratio ◽  
Forming Process ◽  
Cycle Times ◽  
Vacuum Forming ◽  
Draft Angle ◽  
Design And Manufacture

This paper presents an investigation of the positive vacuum forming process. Previous research has indicated requirements of a draft angle of at least two to five degree and a depth to width ratio of not greater than 1:1. For specific formed geometry that required smaller draft angles and greater draw depths these limitations may make the positive vacuum forming process not applicable. The overall aim of this work was to allow the process to become more versatile. This work focused on three prototype moulds which were designed, manufactured, tested and analysed with a view to over come the present process limitations. Moulds were made of wood with a size of 68 x 68 x 75mm. Air holes of 1 and 10mm diameter were drilled in to these moulds in different positions. Polypropylene terephthalate glycol (PETG) materials was used to make the final product via the vacuum process. To release the product from the mould a constant 8bar pressure was applied. Proper time to make the final products and the quality of the final product were investigated. It was found that moulds with air holes opening in all surfaces resulted in shorter cycle times, lower air pressure and better quality of formed parts. It was also found in this work that a zero draft angle and as well as 1:1.1 draw depth was possible to achieve in the vacuum forming process.

scholarly journals The Effect of Knowledge Management Applications on Innovation: A Case Study in the Ministry of Planning and International Cooperation Amman-Jordan

2016 ◽  
Vol 11 (4) ◽  
pp. 282
Author(s):  
Jumana Ziad Al-Zoubi ◽  
Naser A. Aboyassin ◽  
Neda Saleh Nsor
Keyword(s):  
Knowledge Management ◽  
International Cooperation ◽  
Demographic Variables ◽  
Test Analysis ◽  
Gender And Age ◽  
Level Of Significance ◽  
The Impact ◽  
Regression Correlation

The purpose of this study is to identify the impact of knowledge management applications on innovation in Ministry of Planning and International Cooperation in Jordan. Data obtained through a survey questionnaire distributed randomly to a sample of employees from various administrative levels in the ministry. To arrive at statistically significant conclusions, the authors used regression, correlation and Anova test analysis. The results indicate that a statistically significant effect for the impact of knowledge management applications on innovation in their four types (content applications, software and data management applications, smart applications, software and systems of linkage). It also shows that there are no statistically significant differences in innovation that are attributed to demographic variables (gender and age) and job variables (administrative levels and years of experience) at the level of significance (<em>P</em>, 0.05). Since this study was limited to the Ministry of Planning in Jordan, caution must be exercised in generalizing the results from this study to other organizations or sectors. Recommendations: Innovation processes need advanced and appropriate applications of knowledge management in order to improve the quality of administrative performance and to promote motivation ways for employees.

scholarly journals Quality of Services in Health Care Exploring New Opportunity as Medical Tourism in India

2019 ◽  
Vol 8 (3S2) ◽  
pp. 106-111
Keyword(s):  
Health Care ◽  
Medical Tourism ◽  
Study Data ◽  
Quality Of Services ◽  
Medical Procedure ◽  
Test Analysis ◽  
The People ◽  
The Mean ◽  
The Impact

Medical tourism is being a hot cake for the people of India. An emerging destination for tourism, and support getting from government is fortified the impact of services in this sector. This study is exploring the impacts of quality and cost based services in health care which is helping the health care sector to attract more customers across the world. Now a day India has been developed as a great destination for eco-tourism, medical tourism where uses of technology enabled services in medical procedure make it more safe and reliable. In this study data was normally distributed so researchers compare the mean and used t-test analysis. Resultants are exploratory in nature

scholarly journals Optimization of Production Parameters in Oriented Strand Board (OSB) Manufacturing by Using Taguchi Method

2021 ◽  
Vol 72 (4) ◽  
pp. 347-352
Author(s):  
Ahad Furugi ◽  
Fatih Yapici
Keyword(s):  
Taguchi Method ◽  
Oriented Strand Board ◽  
Orthogonal Design ◽  
Process Conditions ◽  
Taguchi Technique ◽  
Effective Parameters ◽  
Pressure Time ◽  
Verification Test ◽  
The Impact

Optimization of process conditions in oriented strand board (OSB) manufacturing is a very important issue for both reducing cost and improving the quality of panels. Taguchi experimental design technique was applied to determination and optimization of the most influential controlling parameters of OSB panels such as press condition (pressure-time-temperature) and the ratio of adhesive parameters on modulus of elasticity (MOE). The value of the MOE is one of the very important mechanical properties of OSB panels. For this purpose, several experiments were conducted according to Taguchi L27 orthogonal design. The signal-to-noise (S/N) and the analysis of variance (ANOVA) were used to find the optimum levels and to indicate the impact of the controlling parameters on MOE. A verification test was also performed to prove the effectiveness of Taguchi technique. Since the predicted and the measured values were very close to each other, it was concluded that the Taguchi method was very successful in the optimization of effective parameters in OSB’s manufacturing.

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