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Orbital Drilling Optimization in High Speed Machining and Fatigue Life Enhancement by Orbital Roller Burnishing: Application to an Aluminum Alloy

INSA Toulouse-Alain Daidie
Université Paul Sabatier Ups-Landry Arnaud Kamgaing Souop, Yann Landon, Johanna Senatore
Published 2019-09-16 by SAE International in United States
Orbital drilling has proved to be advantageous to achieve aeronautical-level quality drilling (surface roughness, geometry control…) fully adapted for complex assemblies in a single operation. However, compared to conventional drilling method, this process leads to a drastic change in structure’s fatigue life probably due to a non-optimised level of residual stress. The control of the mechanical behaviour of parts obtained by orbital drilling is the goal of the European-CleanSky collaborative R&D project RODEO (Robotized Orbital Drilling Equipment and Optimized Residual Stresses, GA no.738219). In this work, an orbital drilling unit (ORBIBOT) allowing high speed machining conditions was developed by PRECISE France, that can be integrated on a lightweight industrial robot. Cutting parameters were determined through an original Tool-Material Couple optimization strategy dedicated to orbital drilling, developed with MITIS Engineering and carried out on 2024-T351 Aluminum alloy. In order to enhance the mechanical behaviour of the system (fatigue, surface hardening…), an innovative mechanical surface treatment has been introduced for investigations: orbital roller burnishing, performed right after orbital drilling. The burnisher follows a helical path around the…
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Development of Regenerative Brake Control Strategy to Remove Brake Rust

Hyundai & Kia Corp-Sora Jang, Gwichul Kim
Published 2019-09-15 by SAE International in United States
This study is the development concept of regenerative braking cooperative control to reduce creep groan noise considering fuel efficiency. Creep groan noise is a traditional brake system noise that has been improved with advances in technology such as brake materials, surface treatment and transfer path. However, recently creep groan noise is again an issue in electronic vehicle which applied a drive motor. Generally, creep groan noise frequently occurs when rust occurs on the friction surface of the brake disc and the brake pad is humidified, but it is easily removed by friction braking several times. However, in the case of electric vehicles which applied regenerative braking system, it is hard to remove. In case of electric vehicle, instead of friction braking, most of brake toques are made by motor regenerative braking. Therefore, even if the same conventional brake system and chassis system are applied, the noise level of the electric vehicle is higher than gasoline or diesel vehicle, and the field claim is also higher. To improve the noise, regenerative braking cooperative control logic was…
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Surface Treatment Could Improve Refrigeration Efficiency

  • Magazine Article
  • TBMG-35131
Published 2019-09-01 by Tech Briefs Media Group in United States

Unlike water, liquid refrigerants and other fluids that have a low surface tension spread quickly into a sheet when they come into contact with a surface. For many industrial processes, it would be better if the fluids formed droplets that could roll or fall off the surface and carry heat away with them.

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Steel, Corrosion and Heat Resistant, Seamless Tubing 23Cr - 13.5Ni (309S) Solution Heat Treated

AMS F Corrosion Heat Resistant Alloys Committee
  • Aerospace Material Specification
  • AMS5574F
  • Current
Published 2019-07-31 by SAE International in United States
This specification covers a corrosion and heat resistant steel in the form of seamless tubing.
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Superfinishing of HVOF Applied Tungsten Carbide Coatings

AMS B Finishes Processes and Fluids Committee
  • Aerospace Material Specification
  • AMS2452
  • Current
Published 2019-07-15 by SAE International in United States
This specification covers requirements for the superfinishing of High Velocity Oxygen/Fuel (HVOF) applied tungsten carbide thermal spray coatings.
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Plating, Gold for Thermal Control

AMS B Finishes Processes and Fluids Committee
  • Aerospace Material Specification
  • AMS2425F
  • Current
Published 2019-07-15 by SAE International in United States
This specification covers the requirements for gold deposited on metal surfaces and the properties of the deposit.
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Insert, Screw Thread, Self-Locking, UNS S66286, Locked in, Key Locked Procurement Specification for

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AS4892B
  • Current
Published 2019-07-01 by SAE International in United States
This procurement specification covers inserts made from A286 alloy of the type identified under the Unified Numbering System as UNS S66286 which have self-locking internal threads and integrated locking keys to positively secure the insert against rotation when properly installed in threaded holes.
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Titanium Alloy, Bars, Wire, and Rings 5Al - 2.5Sn Annealed, 110 ksi (758 MPa) Yield Strength

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4926P
  • Current
Published 2019-06-20 by SAE International in United States
This specification covers a titanium alloy in the form of bars, wire, flash welded rings 4.000 inches (101.60 mm) and under in nominal diameter or least distance between parallel sides and 16 in2 (103 cm2) and under in cross-sectional area, and stock of any size for flash welded rings.
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Etching of Fluoropolymer Insulations

AE-8A Elec Wiring and Fiber Optic Interconnect Sys Install
  • Aerospace Standard
  • ARP6167
  • Current
Published 2019-06-11 by SAE International in United States
This SAE Aerospace Recommended Practice (ARP) describes the etching of fluoropolymer electrical wire insulations to ensure that all facets of the process from the chemistry to the processing, to the storage and handling are well defined.
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Titanium Alloy Bars, Forgings, and Rings 6Al - 4V Extra Low Interstitial (ELI) Duplex Annealed, Fracture Toughness

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4931F
  • Current
Published 2019-06-11 by SAE International in United States
This specification covers a titanium alloy in the form of bars 6.000 inches (152.40 mm) and under in nominal diameter or least distance between parallel sides, forgings and flash welded rings 6.000 inches (152.40 mm) and under in thickness, and stock for forging and stock for flash welded rings of any size.
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