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Experimental and Analytical Study of Drawbead Restraining Force for Sheet Metal Drawing Operations

Oakland University-Natalia Reinberg, Ashutosh Mokashi, Saeid Nasheralahkami, Sergey Golovashchenko, Srecko Zdravkovic, Yurdaer Demiralp
  • Technical Paper
  • 2020-01-0753
To be published on 2020-04-14 by SAE International in United States
Design of sheet metal drawing processes requires accurate information about the distribution of restraining forces, which is usually accomplished by a set of drawbeads positioned along the perimeter of the die cavity. This study is targeting bringing together the results of finite element analysis and experimental data in order to understand the most critical factors influencing the restraining force. The experimental study of the restraining force was performed using drawbead simulator tool installed into a tensile testing machine. Based upon the experimental results, it was observed that the restraining force of the given drawbead configuration is dependent upon the depth of bead penetration, friction between the drawbead surfaces as well as the clearance between the flanges of the drawbead simulator. This clearance is often adjusted during stamping operations to increase or decrease material inflow into the die cavity without any modification in the die. Numerical simulation was performed with Autoform software following the geometry of the experimental drawbead tools used in this study. Two different surface conditions were used in the experimental tools: surface treatment…
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A Direct Engineering Approach to Draw Die Binder Development Design

Creative Concepts Company-Edmund A. Herman
  • Technical Paper
  • 2020-01-0952
To be published on 2020-04-14 by SAE International in United States
A method of designing the binder developments of draw dies for sheet metal stampings that integrates the mathematics of formability, kinematics and friction into the design (i.e. synthesis) process is described. The method is in four phases: (1) Forming feasibility of the product design, (2) 3D wireframe design of the addendum, (3) Surfacing of the addendum, and (4) Productionizing the design. The objectives (e.g., splits, wrinkles, spring-back, etc) are converted to strains and displacements that must be imposed at strategic locations and then a 3D wireframe of true arcs is constructed to approximate the product geometry. The forming feasibility is then calculated for each arc of the wireframe outward in sequence from the defined strategic conditions quantifying the force-displacement energy continuum that must be imposed at the edge-of-part. The construction of the wire frame is then continued outward arc-by-arc to create the die addendum shape that will impose the required energy onto the edge-of-part, the length of line required in the wrap surface and the blank size. The design is then surfaced and checked with…
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new

Alternatives to Cadmium Plating

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AIR4160B
  • Current
Published 2020-03-24 by SAE International in United States
To document and provide access to information obtained by an industry survey.
This content contains downloadable datasets
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Titanium Alloy, Hydraulic, Seamless Tubing 3.0Al - 2.5V Annealed

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4943L
  • Current
Published 2020-02-18 by SAE International in United States
This specification covers a titanium alloy in the form of seamless tubing.
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Titanium Alloy Tubing, Seamless, Hydraulic 3Al - 2.5V, Texture Controlled Cold Worked, Stress Relieved

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4946F
  • Current
Published 2020-02-13 by SAE International in United States
This specification covers a titanium alloy in the form of seamless tubing.
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Titanium Alloy Tubing, Seamless, Hydraulic 3Al - 2.5V, Controlled Contractile Strain Ratio Cold Worked, Stress Relieved

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4945H
  • Current
Published 2020-02-13 by SAE International in United States
This specification covers a titanium alloy in the form of seamless tubing.
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Outsourcing Plasma Treatments for Surface Modification

Aerospace & Defense Technology: February 2020

  • Magazine Article
  • 20AERP02_02
Published 2020-02-01 by SAE International in United States

In manufacturing, plasma treatments are often utilized to solve problems that cannot be resolved other ways. Whether attempting to improve adhesion of dissimilar materials; depositing coatings; cleaning surfaces; applying a protective coating that repels water, for example, or biological fluids; or enhancing surface wettability or functional coating, plasma treatments often add significant value to products.

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Titanium Alloy Tubing, Seamless, Hydraulic 3.0Al - 2.5V Cold Worked, Stress Relieved

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4944M
  • Current
Published 2020-01-30 by SAE International in United States
This specification covers a titanium alloy in the form of seamless tubing.
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Use of staircase method to validate a new design of engine pulley

Cummins Brasil LTDA-Tadeus Marchesi, Wagner Trindade
  • Technical Paper
  • 2019-36-0255
Published 2020-01-13 by SAE International in United States
A Cummins internal project demanded the development of a new crankshaft pulley. This new pulley will be mounted in the engine, but before this mounting process, a validation phase must be accomplished with the primary goal of avoiding failures during engine tests and, most of all, during vehicle operation. This article documents part of the work done to validate the new pulley, aiming to deliver a component that meets the specification demanded by the application to be released in the market. It is presented how acceptable unreliability of the pulley was assessed by means of fatigue testing. Several approaches could be used, but following internal standards for this kind of component, the procedure chosen was the staircase fatigue method. After finishing the testing phase and data treatment, the findings indicated that the new crankshaft pulley presented infinite life when subjected to the hub load found in the application with a design margin of 82%. Another validation that was carried out is related to the bolts used in the mounting. The bolted joint measurement and its…
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Anodic Treatment of Aluminum Alloys Sulfuric Acid Process, Undyed Coating

AMS B Finishes Processes and Fluids Committee
  • Aerospace Material Specification
  • AMS2471J
  • Current
Published 2020-01-13 by SAE International in United States
This specification establishes the requirements for undyed anodic coatings on aluminum alloys.
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