scholarly journals COMPARISON OF CONVENTIONAL DRAWING, INVERTED DRAWING AND WARM FORMING PROCESSES FOR DEEP DRAWING OF ALUMINIUM CUPS

2014 ◽  
pp. 279-282
Author(s):  
RAJAGANAPATHY C ◽  
THIVAKAR K. G ◽  
SARAVANAKUMARN SARAVANAKUMARN
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Draw Ratio ◽  
Warm Forming ◽  
Process Time ◽  
Drawing Process ◽  
Forming Process ◽  
Die Set ◽  
Cup Drawing

Cup drawing is one of the important operations in sheet metal forming. Manufacturing of the aluminium base cup involves several stages such as blanking, first drawing, second drawing, taper formation and trimming. This increases the process time. An attempt has therefore, been made to develop a comprehensive, rigorous, yet easily-workable method of analysis for designing a die set to combine the intermediate stages of drawing process. Conventional drawing, inverted drawing and warm forming processes are experimented for yielding successful drawing in single setup. Die sets are separately designed for above said processes. The die sets, thus designed is simulated using DEFORM-F2 to analyze the successful Drawability of the die sets. From the simulations conducted, the die set designed for warm forming process yields greater Limiting Draw Ratio (LDR). Using warm forming process, the LDR of 2.0 was achieved which is much higher when compared with the conventional drawing.

Experimental investigation into a new hybrid-forming process: Incremental stretch drawing

2016 ◽  
Vol 232 (3) ◽  
pp. 475-486 ◽  
Author(s):  
Puneet Tandon ◽  
Om Namah Sharma
Keyword(s):  
Experimental Investigation ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Lead Time ◽  
Drawing Process ◽  
Forming Process ◽  
Setup Cost ◽  
Deep Drawing Process ◽  
Incremental Sheet Metal Forming

Incremental sheet metal forming is an evolving process, which is suitable for the production of limited quantities of sheet metal components. The main advantages of this process over conventional forming processes are reduced setup cost and manufacturing lead time, as it eliminates the need of special purpose dies, improves formability, reduces forming forces, and provides process flexibility. The objective of this work is to investigate a new hybrid-forming process, which intends to combine incremental sheet metal forming with deep drawing process and has been named as “incremental stretch drawing.” A number of setups and fixtures were developed to carry out experiments to achieve incremental stretch drawing and understand the mechanism of the process. This process addresses some of the challenges of incremental sheet metal forming, that is, limited formability in terms of forming depth, especially at steeper wall angles and subsequent thinning of sheet. It is observed that the proposed process is able to reduce thinning as much as about 300%, considering same forming depth for incremental sheet metal forming and incremental stretch drawing processes. Improvement in formability, in terms of forming depths, also has been observed to be near about 100% in particular cases.

Study on the Surface Quality of Fender NC Incremental Forming

2011 ◽  
Vol 335-336 ◽  
pp. 523-526
Author(s):  
Liu Ru Zhou
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Process Time ◽  
Forming Process ◽  
Forming Technology ◽  
Starting Point ◽  
Incremental Sheet Metal Forming ◽  
Metal Deformation ◽  
Improvement Method

The NC incremental sheet metal forming technology is a flexible forming technology without dedicated forming dies. The forming locus of the forming tool can be adjusted by correcting the numerical model of the product. Because the deformation of sheet metal only occurs around the tool head and the deformed region is subjected to stretch deformation, the deformed region of sheet metal thins, and surface area increases. Sheet metal forming stepwise is to lead to the whole sheet metal deformation. The principle of NC incremental sheet metal forming and the forming process of the fender are introduced. The effect of process parameters on forming is analysed. The improvement method of the forming quality is suggested. The groove is created in the starting point of tool moving when the starting point of tool moving locus at all layers is identical. The groove can be eliminated when the starting point of tool moving locus at all layers is different. The feed pitch p increase, the process time decrease, production rate and surface degree of roughness increase. In general, the feed pitch is 0.25mm.

Strain Histories and Strain Distributions in a Cup Drawing Operation

1971 ◽  
Vol 93 (2) ◽  
pp. 461-466 ◽  
Author(s):  
T. C. Hsu ◽  
W. R. Dowle ◽  
C. Y. Choi ◽  
P. K. Lee
Keyword(s):  
Sheet Metal ◽  
Metal Forming ◽  
Drawing Process ◽  
Neck Formation ◽  
Forming Process ◽  
Orthogonal Space ◽  
Points Of Interest ◽  
Metal Forming Process ◽  
Principal Directions ◽  
Cup Drawing

In the axisymmetrical cup drawing process, the principal directions of the strains are fixed with respect to the work material at every point and in every stage of the process; in other words, the strains are entirely coaxial ones—if the small strains in simple shear due to friction are ignored. For a properly chosen set of orthogonal space coordinates, therefore, the strains may be plotted in triangular coordinates. In such a coordinate system for strains, the loci for constant penetrations show the strain distributions, and those for constant initial radial positions show the strain histories. In these loci it is easy to see thinning and thickening, circumferential expansion and contraction, neck formation, variation in thickness, and other points of interest to the sheet metal engineer. Typical examples of strain histories and strain distributions in a cup drawing operation are shown. The method is applicable to any axisymmetrical sheet metal forming process.

scholarly journals Laser Welding of High-strength Aluminium Alloys for the Sheet Metal Forming Process

Procedia CIRP ◽  
2014 ◽  
Vol 18 ◽  
pp. 203-208 ◽  
Author(s):  
J. Enz ◽  
S. Riekehr ◽  
V. Ventzke ◽  
N. Sotirov ◽  
N. Kashaev
Keyword(s):  
Laser Welding ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Aluminium Alloys ◽  
High Strength ◽  
Forming Process ◽  
Metal Forming Process

scholarly journals Methods of determination of frictional resistances in sheet metal forming of car body sheets

2018 ◽  
Vol 19 (6) ◽  
pp. 756-760
Author(s):  
Tomasz Trzepieciński ◽  
Irena Nowotyńska
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Complex Function ◽  
Forming Process ◽  
The Coefficient Of Friction ◽  
Displacement Speed ◽  
Almost All ◽  
Lubrication Conditions

The friction phenomenon existed in almost all plastic working processes, in particular sheet metal forming, is a complex function of the material's properties, parameters of the forming process, surface topography of the sheet and tools, and lubrication conditions. During the stamping of the drawpieces there are zones differentiated in terms of stress and strain state, displacement speed and friction conditions. This article describes the methods for determining the value of the coefficient of friction in selected areas of sheet metal and presents the drawbacks and limitations of these methods.

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