Fibre Reinforced Refractory Castables :An Alternative Solution for SPF Die Manufacturing

2007 ◽  
Vol 551-552 ◽  
pp. 37-42 ◽  
Author(s):  
Gérard Bernhart ◽  
F. Nazaret ◽  
T. Cutard
Keyword(s):  
Complex Shape ◽  
Complex Structure ◽  
Testing Temperature ◽  
Fibre Reinforcement ◽  
Delivery Time ◽  
Forming Process ◽  
Cast Steels ◽  
Refractory Castables ◽  
Technological Sample ◽  
Nominal Solution

Today heat resistant cast steels are the nominal solution for Ti-SPF forming die manufacturing. Nevertheless, this materials present some drawbacks related to delivery time and cost. A fibre reinforced refractory castable (FRRC) is proposed as a new solution for prototype SPF die manufacturing. Due to the general brittleness of refractory castables, a short fibre reinforcement has been investigated in order to avoid catastrophic failure during the forming process. General macroscopic behavior of such materials is very complex and presents large evolutions with the testing temperature. The paper addresses the important benefits of the reinforcement for refractory castable in the case of loading on a complex structure. The capability of the material to support several cracks is shown in the case of a technological sample with a complex shape.

Investigation of the mechanical and forming behaviour of 3D warp interlock carbon woven fabrics for complex shape of composite material

2021 ◽  
pp. 152808372098410
Author(s):  
Mehmet Korkmaz ◽  
Ayşe Okur ◽  
Ahmad Rashed Labanieh ◽  
François Boussu
Keyword(s):  
Composite Materials ◽  
Complex Shape ◽  
Impact Damage ◽  
Woven Fabrics ◽  
Forming Process ◽  
Warp Yarn ◽  
Delamination Resistance ◽  
Fabric Architecture ◽  
Weave Pattern ◽  
Carbon Fabrics

Composite materials which are reinforced with 3D warp interlock fabrics have outstanding mechanical properties such as higher delamination resistance, ballistic damage resistance and impact damage tolerance by means of their improved structural properties. Textile reinforcements are exposed to large deformations in the production stage of composite materials which have complex shape. Although good formability properties of 3D warp interlock fabrics in forming process were already proven by recent studies, further information is needed to elucidate forming behaviours of multi-layer fabrics which is produced with high stiffness yarns like carbon. In this study, 3D warp interlock carbon fabrics were produced on a prototype weaving loom and the same carbon yarn was used in two fabric directions with equal number of yarn densities. Fabrics were differentiated with regard to the presence of stuffer warp yarn, weave pattern and parameters of binding warp yarn which are angle and depth. Therefore, the effect of fabric architecture on the mechanical and formability properties of 3D warp interlock carbon fabrics could be clarified. Three different breaking behaviours of fabrics were detected and they were correlated with crimp percentages of yarn groups. In addition, the bending and shear deformations were analysed in view of parameters of fabric architectures. Two distinct forming behaviours of fabrics were determined according to the distribution of deformation areas on fabrics. Moreover, the optimal structure was identified for forming process considering the fabric architecture.

scholarly journals Deformation Characteristics and Microstructure Analysis of Aluminum Alloy Component with Complex Shape by Cold Orbital Forming

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 808
Author(s):  
Wei Feng ◽  
Chaoyi Jin ◽  
Jiadong Deng ◽  
Wuhao Zhuang
Keyword(s):  
Aluminum Alloy ◽  
Complex Shape ◽  
Fe Simulation ◽  
Effective Strain ◽  
Electron Back Scatter Diffraction ◽  
Main Body ◽  
Deformation Characteristics ◽  
Alloy Component ◽  
Forming Process ◽  
Orbital Forming

This work aimed to study the deformation characteristics and microstructure of AA6063 aluminum alloy component with complex shape manufactured by cold orbital forming processing. The material flowing behavior was analyzed by Finite Element (FE) simulation and forming experiments were carried out using bar blank with different lengths. The microstructure of the boss zone cut from the formed samples was observed using scanning electron microscopy (SEM) and electron back-scatter diffraction (EBSD). FE simulation and experiment results both showed the aluminum base can be formed using cold orbital forming process. The distributions of the effective strain of the component with different blank lengths were almost the same, and the effective strain was bigger at the boss and the flash as the forming finished. The material flow is complex, especially in the boss, and the folding defect was observed at the root of the boss. The distribution of Mg2Si strengthening precipitate is more homogeneous in the matrix, has a different shape, and shows directivity at different position of boss zone. The grains are elongated, and the extent is different at different positions of the boss zone after cold orbital forming, and the crystal orientation discrepancy is smaller in the component main body and bigger in the boss zone. Subsequent forming process and blank optimization need to be further researched to improve forming quality.

scholarly journals To Explore the Relationship of Factors in the Third-Party Logistics Industry using DEMATEL

2020 ◽  
Vol 9 (6) ◽  
pp. 359-363
Keyword(s):  
Financial Stability ◽  
Complex Structure ◽  
Third Party ◽  
Abu Dhabi ◽  
Third Party Logistics ◽  
Delivery Time ◽  
Logistics Industry ◽  
Cause And Effect ◽  
Important Relationship

The 3PL market is a growing trend around the world, but it is already grown in the UAE, especially in Dubai, where it is having very high market and is growing fast in Abu Dhabi like Dubai. The DEMATEL approach is used to develop an important relationship between dimension and criteria. It uses the matrix and related theories of math to calculate the cause and effect of the degree on each variable. This approach is commonly accustomed to solve various sorts of complex studies which will effectively explain the complex structure and supply the reasonable choices of problem-solving. The primary motivation behind this paper is to break down the components impacting customers' practice in third-party logistics industry by applying DEMATEL strategy. Fourteen factors namely Responsiveness, Reliability of the 3PL provider, Quality of operation, Cost, Flexibility, Financial stability, Delivery time, Ability to meet customer needs, Document accuracy, Storage facilities, Good communication, Attitude towards customers, Technical competence and Reputation are chosen from many different studies. In this research, six experts were involved with a request to evaluate the degree of direct impact between two variables by means of a pair comparison. The results showed the best three significant factors influencing delivery time, quality of operation and cost. Besides, cause and effect connection outlines are additionally built to increase the understanding of the intuitive connection between those criteria. It is discovered that reputation has the most effect on the other factors and cost gets the most effect from different components. At last, this article gives realistic guidelines for the 3PL market in Abu Dhabi, UAE.

Analysis on Formation Causes for Defects of Powder Metallurgy Flyweights

2010 ◽  
Vol 426-427 ◽  
pp. 599-602
Author(s):  
X.P. Shen ◽  
X.Y. Wang ◽  
D.M. Liu ◽  
M. Chen ◽  
C.T. You ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Complex Structure ◽  
Forming Process ◽  
Size Accuracy ◽  
Powder Forming ◽  
Compaction Method

The flyweight of powder metallurgy is a complex structure part of VE distribution pump. The components of the powder forming process often contain the defects such as instability of the quality, over tolerance of the size accuracy, and disqualification of the appearance. By analyzing the causes of defects and corresponding measures is taken. A once pressing compaction method is used to produce qualified products.

Novel Direct Coagulation Casting of Alumina Suspensions Using Y3+-Ion Releasing Substances as Coagulant

2014 ◽  
Vol 602-603 ◽  
pp. 164-169
Author(s):  
Yue Dong ◽  
Xiao Dong Li ◽  
Shao Hong Liu ◽  
Ji Guang Li ◽  
Xu Dong Sun
Keyword(s):  
Complex Shape ◽  
High Density ◽  
Green Body ◽  
Alumina Ceramics ◽  
Forming Process ◽  
Coagulation Time ◽  
Near Net Shape ◽  
Net Shape Forming ◽  
Alumina Suspensions

Direct coagulation casting (DCC) is a relatively new ceramic near-net-shape forming process which can form homogeneous ceramic green body with complex shape and high density. Direct coagulation casting of aqueous alumina slurries by adding Y3+ions, which have been frequently used as additive for the sintering of alumina ceramics, were studied. Two different kinds of Y3+-ion releasing substances, Y2O3powder and Y(NO3)3, were used as coagulants and were introduced into stabilized alumina suspensions directly after dispersing. Compared with that of Y2O3powder, both the coagulation time and the added amount required for a reasonable shaping were significantly reduced for using Y(NO3)3as coagulant. The effects of the two coagulants on the properties of the consolidated green bodies and sintered ceramics were studied. The mechanisms of coagulation induced by the addition of Y3+-ions were discussed on the basis of interactions between Y3+ions and the added polyelectrolyte dispersant.

scholarly journals Comparison of FEM Simulations for the Incremental Forming Process

2005 ◽  
Vol 6-8 ◽  
pp. 533-542 ◽  
Author(s):  
Christophe Henrard ◽  
Anne Marie Habraken ◽  
Alexander Szekeres ◽  
Joost R. Duflou ◽  
S. He ◽  
...  
Keyword(s):  
Complex Shape ◽  
Incremental Forming ◽  
Mesh Size ◽  
Strain History ◽  
Forming Process ◽  
Wall Angle ◽  
Fem Simulations ◽  
Forming Technology ◽  
Reaction Forces ◽  
The University

Incremental forming is an innovative and highly flexible sheet metal forming technology for small batch production and prototyping that does not require any adapted dies or punches to form a complex shape. The purpose of this article is to perform FEM simulations of the forming of a cone with a 50-degree wall angle by incremental forming and to investigate the influence of some crucial computational parameters on the simulation. The influence of several parameters will be discussed: the FEM code used (Abaqus or Lagamine, a code developed at the University of Liège), the mesh size, the potential simplification due to the symmetry of the part and the friction coefficient. The output is given in terms of final geometry (which depends on the springback), strain history and distribution during the deformation, as well as reaction forces. It will be shown that the deformation is localized around the tool and that the deformations constantly remain close to a plane strain state for this geometry. Moreover, the tool reaction clearly depends on the way the contact is taken into account.

The Numerical Simulation for Engine Oil Filter Shell

2014 ◽  
Vol 533 ◽  
pp. 101-105 ◽  
Author(s):  
Yang Li ◽  
Yong Zhou ◽  
De Ming Sun ◽  
Zhong Lei Wang
Keyword(s):  
Numerical Simulation ◽  
Complex Shape ◽  
Sheet Material ◽  
Engine Oil ◽  
Drawing Process ◽  
Forming Process ◽  
Forming Technology

For the complex shape and difficult forming of engine oil filer shell, this paper aims to do research on stamping technology and mold of engine oil filer shell. Based on the calculation and analysis of the forming technology according to its characteristics,the forming process is optimized, which includes 6 steps: blanking and drawing, re-drawing, 3rd-drawing, reshaping, beading and trimming, punching and flanging. Then for the importance of multi-drawing process, the numerical simulation of the multi-drawing process has been carried out by using the Dynaform software. The results show that the good piece of the oil filter shell can be drawn from sheet material through the 6 steps one by one. Finally, according to the results the molds are designed.

Study on the Manufacturing Technology of Directly Metal Forming Based on Overlay Welding

2014 ◽  
Vol 686 ◽  
pp. 22-25
Author(s):  
Li Min Zhang
Keyword(s):  
Metal Forming ◽  
Complex Shape ◽  
Three Dimensional ◽  
Rapid Prototype ◽  
Layer By Layer ◽  
Forming Process ◽  
Functionally Gradient ◽  
Metal Forming Process ◽  
Overlay Welding ◽  
Production Problems

Rapid prototyping technology can greatly improve the actual processing industrial prototype; this paper introduces the main principle, characteristics and technology of rapid prototype manufacturing. The current rapid prototype manufacturing products and production problems are analyzed. Because of the direct metal forming process have the characteristic of point by point, surfacing with stack molding manufacturing layer by layer, so it is suitable for complex shape parts two-dimensional or three-dimensional functionally gradient materials manufacturing.

Numerical simulation of the effects of the space-variant blank-holder force and geometrical variables in the deep-drawing process

2005 ◽  
Vol 40 (4) ◽  
pp. 375-384
Author(s):  
L Wang ◽  
T. C Lee
Keyword(s):  
Complex Shape ◽  
Geometrical Parameters ◽  
Blank Holder Force ◽  
Minor Strain ◽  
Forming Process ◽  
Blank Holder ◽  
Common Problems ◽  
Blank Size ◽  
Space Variant

The increase in quality requirements for the formed products makes it desirable to find an effective way of controlling the process to achieve complex shape products without defects. It has been proven by many researchers that the space-variant blank-holder force can improve the quality of forming to achieve a targeted shape product (no wrinkling, a high drawing depth, less variation in thickness, etc.). In the forming process, the most common problems, tearing and wrinkling, generally result from the strain condition. In this paper the effect on the strain path with various types of space-variant blank-holder force and other geometrical parameters, such as the fillet radius, the blank size, and the clearance between the die and the punch, were compared and analysed. The results showed that the space-variant blank-holder force and some geometrical parameters affect the strain distribution to various extents during the forming process. The parameters influence the negative minor strain much more than the maximum major strain.

Development and Application of the Optimization Design of Progressive Die Based on Transfer Unit

2010 ◽  
Vol 26-28 ◽  
pp. 671-675
Author(s):  
Dao Chun Hu ◽  
Lei Wang
Keyword(s):  
Optimization Design ◽  
Production Efficiency ◽  
Lower Cost ◽  
High Efficiency ◽  
Delivery Time ◽  
Forming Process ◽  
Heat Spreader ◽  
Progressive Die ◽  
Progressive Dies ◽  
Transfer Unit

The objective of this study was to research a newly progressive die , which unifies the merit of high efficiency of the progressive dies and the high material-using ratio of the project dies. This paper analyzes the forming process methods of IHS(Intel Heat Spreader), and develop a set of progressive die with transfer unit , which turns project die to progressive die. The cooperation between the transfer unit and the die was studied, and the key technology of the newly progressive dies were investigated. Compared with the traditional die, the mechanization and electrization are realized to increase the production efficiency and get highly precise IHS. The newly designed transfer unit is expected to be a helpful reference for designers facing demands for higher quality, lower cost and shorter delivery time for some special products.

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