scholarly journals Experimental Investigation of Dimensional Precision of Deep Drawn Cups Using Direct Polymer Additive Tooling

2020 ◽  
Vol 5 (1) ◽  
pp. 3
Author(s):  
Georg Bergweiler ◽  
Falko Fiedler ◽  
Ahsan Shaukat ◽  
Bernd Löffler
Keyword(s):  
Deep Drawing ◽  
Dimensional Accuracy ◽  
Measuring System ◽  
Drawing Process ◽  
Polymer Additive ◽  
Dimensional Precision ◽  
Conventional Steel ◽  
Small Series ◽  
Cost Efficient ◽  
Better Than

While deep drawing of sheet metals is economical at high volumes, it can be very costly for manufacturing prototypes, mainly due to high tooling costs. Additively manufactured polymer tools have the potential to be more cost-efficient for small series, but they are softer and thus less resilient than conventional steel tools. This work aimed to study the dimensional precision of such tools using a standard cup geometry. Tools were printed with FFF using two different materials, PLA and CF-PA. A test series of 20 parts was drawn from each tool. Afterwards, the dimensional precisions of the drawn parts were analyzed using an optical measuring system. The achieved dimensional accuracy of the first drawn cup using the PLA toolset was 1.98 mm, which was further improved to 1.04 mm by altering shrinkage and springback allowances. The repeatability of the deep drawing process for the CF-reinforced PA tool was 0.17 mm during 20 drawing operations and better than that of the PLA tool (1.17 mm). To conclude, deep drawing of standard cups is doable using direct polymer additive tooling with a dimensional accuracy of 1.04 mm, which can be further improved by refining allowances incorporated to the CAD model being printed.

Modulares Kraftmesssystem/Modular measuring system for the force distribution

2015 ◽  
Vol 105 (10) ◽  
pp. 680-686
Author(s):  
W. Zorn ◽  
P. Müller ◽  
W.-G. Drossel
Keyword(s):  
Deep Drawing ◽  
Measuring System ◽  
Force Distribution ◽  
Modular Approach ◽  
Drawing Process ◽  
Defect Production ◽  
Deep Drawing Process ◽  
Machine Control ◽  
Forming Tools ◽  
Mobile Endgeräte

Die in der Werkstückebene vorliegende Kraftverteilung beeinflusst den Umformprozess maßgeblich. Deren Kenntnis ist die Grundlage für die wirksame Kompensation von maschinen- oder werkzeugseitigen Einflüssen, um eine ausschussfreie Teilefertigung zu erzielen. Der Fachbeitrag stellt einen modularen Ansatz für eine wirkstellennahe und gleichzeitig werkzeugunabhängige Kraftmessung vor. Die erfasste Kraftverteilung kann der Maschinensteuerung zur Verfügung gestellt oder über mobile Endgeräte angezeigt werden.   The force distribution in forming tools influences the deep drawing process significantly. The metrological detection is the base for the effective compensation of machine- or tool-caused impacts on the zero-defect production of deep drawing parts. This article presents a modular approach for the tool-independent force distribution measurement close to the process. The captured distribution can be provided to the machine control or can be shown on mobile devices.

Numerical Simulation and Experimental Research on Superplasticity of Ceramic/Ceramic Laminated Composite

2007 ◽  
Vol 551-552 ◽  
pp. 533-538
Author(s):  
Guo Feng Wang ◽  
D.Z. Wu ◽  
C.W. Wang ◽  
Wen Bo Han
Keyword(s):  
Numerical Simulation ◽  
Deep Drawing ◽  
Tape Casting ◽  
Laminated Composite ◽  
Drawing Process ◽  
Hot Press ◽  
Deep Drawing Process ◽  
Forming Temperature ◽  
Hot Press Sintering ◽  
Better Than

In order to investigate the superplasticity of ceramic/ceramic laminated composite under tensile stress, the superplastic deep-drawing process was simulated by FEM. The results shown that, the strain and stress conditions of laminated composite, made by ceramic with different superplastic formability, are better than that of monolithic ceramic. Consequently, the material may exhibit high superplasticity. To testify this, some experiments were carried out. Tape casting and hot-press sintering are used to fabricate Al2O3/3Y-TZP laminated composite. As-received material is deep-drawing at high temperature to research its superplasticity. The results shown that, when suitable strain rate and forming temperature were used, the as-received material has excellent superplasticity.

scholarly journals Effect of Tool Geometry Parameters on the Formability of a Camera Cover in the Deep Drawing Process

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3993
Author(s):  
Thanh Trung Do ◽  
Pham Son Minh ◽  
Nhan Le
Keyword(s):  
Deep Drawing ◽  
Thickness Distribution ◽  
Metal Flow ◽  
Sheet Thickness ◽  
Side Wall ◽  
Tool Geometry ◽  
Drawing Process ◽  
Nose Radius ◽  
Deep Drawing Process

The formability of the drawn part in the deep drawing process depends not only on the material properties, but also on the equipment used, metal flow control and tool parameters. The most common defects can be the thickening, stretching and splitting. However, the optimization of tools including the die and punch parameters leads to a reduction of the defects and improves the quality of the products. In this paper, the formability of the camera cover by aluminum alloy A1050 in the deep drawing process was examined relating to the tool geometry parameters based on numerical and experimental analyses. The results showed that the thickness was the smallest and the stress was the highest at one of the bottom corners where the biaxial stretching was the predominant mode of deformation. The problems of the thickening at the flange area, the stretching at the side wall and the splitting at the bottom corners could be prevented when the tool parameters were optimized that related to the thickness and stress. It was clear that the optimal thickness distribution of the camera cover was obtained by the design of tools with the best values—with the die edge radius 10 times, the pocket radius on the bottom of the die 5 times, and the punch nose radius 2.5 times the sheet thickness. Additionally, the quality of the camera cover was improved with a maximum thinning of 25% experimentally, and it was within the suggested maximum allowable thickness reduction of 45% for various industrial applications after optimizing the tool geometry parameters in the deep drawing process.

Blank shape optimization in the deep drawing process by sun method

2021 ◽  
Author(s):  
Hamidreza Gharehchahi ◽  
Mohammad Javad Kazemzadeh-Parsi ◽  
Ahmad Afsari ◽  
Mehrdad Mohammadi
Keyword(s):  
Shape Optimization ◽  
Deep Drawing ◽  
Drawing Process ◽  
Deep Drawing Process ◽  
Blank Shape Optimization ◽  
Blank Shape

Production of Tapered Cups by Sequential Deep Drawing of Sheet Metals Using Drawn Cups as a Part of Punch

1993 ◽  
Vol 115 (2) ◽  
pp. 224-229 ◽  
Author(s):  
K. Yamaguchi ◽  
K. Kanayama ◽  
M. H. Parsa ◽  
N. Takakura
Keyword(s):  
Deep Drawing ◽  
Drawing Ratio ◽  
Drawing Process ◽  
Sheet Metals ◽  
Deep Drawing Process ◽  
Drawing Method

A new deep drawing process of sheet metals is developed to facilitate small-lot production of deep cups with large drawing ratio. In this process, unlike the conventional deep drawing method, a few drawn cups are always stacked on the punch and used as a part of punch for the subsequent deep drawing of a given blank. Before drawing a new blank, a drawn cup which is in contact with the punch is stripped off. The repetition of such stripping and drawing operations makes it possible to carry out both the first-stage drawing and the subsequent slight redrawings in one drawing operation using only one pair of punch and die. In this paper, this new deep drawing process is applied to the production of tapered cups and the main feature of the process is shown.

Second Paper: Deep Drawing and Free Forming Using a Water Hammer Technique

1964 ◽  
Vol 179 (1) ◽  
pp. 222-233 ◽  
Author(s):  
A. P. Vafiadakis ◽  
W. Johnson ◽  
I. S. Donaldson
Keyword(s):  
Deep Drawing ◽  
Time History ◽  
Water Hammer ◽  
High Rate ◽  
Pressure Time ◽  
Order Of Magnitude ◽  
History Of ◽  
Overall Efficiency ◽  
Initial Movement ◽  
Better Than

Earlier work on a water-hammer technique for high-rate forming of sheet metal has been extended to include work on deep drawing using lead plugs. A study of the pressure-time history of a deforming blank during its initial movement is reported. An assessment of the overall efficiency of the process has been made and is found to be about 50 per cent; this is an order of magnitude better than that found with comparable electro-hydraulic and explosive methods.

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