Grain Size Effect on Saddle Phenomenon in V-Bending Process of Thin Sheet Metal

2018 ◽  
Vol 773 ◽  
pp. 202-207
Author(s):  
Chang Cheng Chen ◽  
Yi Xiang Hong
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Sheet Metal ◽  
Design Method ◽  
Tensile Force ◽  
Thin Sheet ◽  
Grain Size Effect ◽  
Sheet Metal Parts ◽  
Grain Sizes ◽  
Thin Sheet Metal

The ability for predicting the springback on sheet metal bending processes is identified as an important feature of the ability for predicting the final geometry of sheet metal parts. The grain size effect makes the difficult on application of traditional design method in processing. As through tool and processing design, to understand the effects of grain size effects is an important and powerful way to effectively compensate for and eliminate the springback. In this paper, 99.5% pure iron specimens were annealed at different temperature to obtain the specified grain sizes. The effects of different grain sizes on the saddle after V-bending of the thin sheet metal were investigated. The results show that at the same thickness of specimens, the grain size has no significant effect on the saddle height. However, with increasing the thickness of the specimens the saddle will also be more prominent protruding height. The concave side of bent specimen is against the compression force and its grains structure tend to a round shape, whereas the convex side is against the tensile force and its grains structure tend to a flaky shape.

The Effects of Grain Size and Lubrication on Micro Curl Forming Process of Metallic Thin Sheet

2015 ◽  
Vol 661 ◽  
pp. 55-61
Author(s):  
Chang Cheng Chen ◽  
Huey Lin Ho
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Size Effect ◽  
Deformation Behavior ◽  
Thin Sheet ◽  
Grain Size Effect ◽  
Forming Process ◽  
Grain Sizes ◽  
Different Temperatures ◽  
Different Thickness

This article aims at the discussion of deformation behavior considering size effect on curl forming process of sheet metal. In this study, the test specimens were made by phosphor bronze sheets for curl forming test. The specimens with different thickness were firstly heated at different temperatures for obtaining the objective grain sizes. And the mechanical properties of specimen were acquired by using tensile test. Through the curl forming test with a curl forming machine, the curled angles, springback and curling load were measured and analyzed for investigating the grain size effect of the chamfer and carbon lubricant during the curl forming process.

Experimental and Numerical Analysis of Blanking for Thin Sheet Metal Parts

2001 ◽  
Vol 4 (3-4) ◽  
pp. 319-333
Author(s):  
Vincent Lemiale ◽  
Philippe Picart ◽  
Sébastien Meunier
Keyword(s):  
Numerical Analysis ◽  
Sheet Metal ◽  
Thin Sheet ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Thin Sheet Metal

Heterogeneity Effects in X-Ray Analysis*

1961 ◽  
Vol 5 ◽  
pp. 335-354 ◽  
Author(s):  
Fernand Claisse ◽  
Claude Samson
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Mathematical Treatment ◽  
Grain Size Effect ◽  
Light Elements ◽  
X Ray Diffraction ◽  
Limited Region ◽  
X Ray ◽  
Grain Sizes ◽  
Heterogeneity Effects

AbstractA fundamental quantitative treatment of the heterogeneity effects in X-ray fluorescence has been made. The theory predicts that the grain-size effect appears only in a limited region of grain sizes which depends on the wavelength of the primary radiation and the nature of the compounds in the mixture. With monochromatic radiation, the fluorescence intensity showed increase or decrease by a factor of a few units as grain size is decreased, A factor as large as 12, the theoretical value, has been observed in one particular experiment. Usually the grain-size effect can be eliminated by intensive grinding. For the light elements fine grinding is disastrous if long wavelengths are used. By an appropriate choice of the wavelength it is possible to eliminate the effect even without grinding. The mathematical treatment also predicts, but less rigorously, a grain-size effect in X-ray diffraction.The effect on the fluorescence intensities by changes in the chemical composition of the grains that contain the fluorescent element is predicted by the theory.These findings are discussed in relation to the analysis of elements when polychromatic beams are used.

Progressive and Compound Forming for Producing Plunger-Typed Microparts by Using Sheet Metal

2020 ◽  
Vol 8 (2) ◽  
Author(s):  
Jun-Yuan Zheng ◽  
Ming-Wang Fu
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Sheet Metal ◽  
Mass Production ◽  
Grain Size Effect ◽  
Sheet Metals ◽  
Forming Process ◽  
Deformation Behaviors ◽  
Progressive Forming ◽  
Insight Into

Abstract The plunger part in temporary electronic connectors is traditionally fabricated by micromachining. Progressive forming of microparts by directly using sheet metals is developed and proven to be an efficient microforming process to overcome some intrinsic drawback in realization of mass production of microparts. By employing this unique micromanufacturing process, an efficient approach with progressive microforming is developed to fabricate plunger-shaped microparts. In this endeavor, a progressive forming system for making microplungers using extrusion and blanking operations is developed, and the grain size effect affected deformation behaviors and of surface qualities of the microformed parts are studied. The knowledge for fabrication of plunger-shaped microparts via progressive microforming is developed, and the in-depth understanding and insight into the deformation behaviors and tailoring the product quality and properties will facilitate the design and development of the forming process by using this unique microforming approach.

Grain Size Effect on the Type VT1-0 Alloy Modified by Aluminum Ion Implantation

2015 ◽  
Vol 670 ◽  
pp. 144-151
Author(s):  
Irina Kurzina ◽  
Alisa Nikonenko ◽  
Natalja Popova ◽  
Elena L. Nikonenko ◽  
Mark Kalashnikov
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Ion Implantation ◽  
Size Effect ◽  
Phase State ◽  
Grain Size Effect ◽  
Significant Modification ◽  
Aluminum Ion ◽  
Grain Sizes ◽  
Aluminum Ions

The paper presents results of investigations of α-Ti microhardness modified by aluminum ions having diverse grain sizes, namely: 0.3 μm, 1.5 μm, and 17 μm. These investigations show that the decrease of the grain size and the additional ion implantation result in the significant modification of the structural and phase state of the alloy and its mechanical properties.

GRAIN SIZE EFFECT ON THE COLOSSAL MAGNETORESISTANCE IN GRANULAR PEROVSKITE La0.7Pb0.3MnO3

2006 ◽  
Vol 20 (29) ◽  
pp. 1859-1865 ◽  
Author(s):  
S. L. YOUNG ◽  
H. Z. CHEN ◽  
M. C. KAO ◽  
L. HORNG ◽  
K. M. WU ◽  
...  
Keyword(s):  
Grain Size ◽  
Magnetic Susceptibility ◽  
Size Effect ◽  
Colossal Magnetoresistance ◽  
Double Exchange ◽  
Tunneling Effect ◽  
Grain Size Effect ◽  
Double Exchange Interaction ◽  
Grain Sizes ◽  
Ferromagnetic Ordering

Magnetic behaviors and transport properties in granular perovskite La 0.7 Pb 0.3 MnO 3 with different grain sizes have been synthesized. The results show that magnetic susceptibility, ferromagnetic ordering temperature and magnetoresistance are affected by the grain size. These compounds with different grain sizes exhibit two kinds of magnetoresistance origins, intragrain double exchange and intergrain interfacial tunneling. With the increasing grain size, the intrinsic transport is dominant while the extrinsic tunneling gradually disappears. Thus, the basis of magnetotransport mechanism is the result of competition between the double exchange interaction and the interfacial tunneling effect.

Roll Bending of Thin Sheet Metal Parts on Press Brakes

CIRP Annals ◽  
1993 ◽  
Vol 42 (1) ◽  
pp. 295-300 ◽  
Author(s):  
E. v. Finckenstein ◽  
F. Haase ◽  
M. Kleiner ◽  
G. Reil ◽  
R. Schilling ◽  
...  
Keyword(s):  
Sheet Metal ◽  
Thin Sheet ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Roll Bending ◽  
Thin Sheet Metal
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