Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras

A Method of Producing Foils using LSEM Fixture

Technology Category/Market

Technology: Producig foils using  LSEM fixture

Category: Advance Material & Manufacturing

Industry: Manufacturing

Application: Automotive, Machine tool

Market: The global market size was estimated at USD 92.78 billion in 2023 and is anticipated to grow at a CAGR of 5.8% from 2024 to 2030.

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Problem Statement

  • Nanocrystalline (grain size < 100 nm) and ultra-fine-grained (grain size between 100 nm and 1000 nm) materials are characterized by superior mechanical properties vis-a-vis their conventional counterparts.
  • Large strain extrusion machining (LSEM) is a severe plastic deformation process used to produce nano crystalline and ultra-fine-grained chips or shavings due to its enhanced mechanical properties, including hardness, strength, ductility, fracture toughness, fatigue life, and wear resistance.
  • Furthermore, this process has the potential to be a low-cost alternative for the production of fine grained chips in the form of sheets, foils, and rods especially from high strength metals and alloys.

Technology

  • A fixture for holding a cutting tool to provide constraint during large strain extrusion machining (LSEM) with higher chip compression ratio to produce fine-grained foils, characterized by:-
  • A Ti-6AI-4V plate with a strong transverse texture which is suitably textured by the cold-rolling process to suppress shear localization in the extrusion-machined foils.
  • A fixture with a wedge-shaped slot provided to facilitate the flow of foils, and
  • A cutting tool positioned in the fixture with a groove type restricted contact for performing large strain extrusion machining.

Key Features/Value Proposition

“Suppressing Shear Localization in Ti-6Al-4V”

  • Modification of fixture in Ti-6Al-4V via cold-rolling.
  • Extrusion-machining of textured plates using higher compression ratio.
  • Fine-grained continuous foils with increased hardness.
  • Reduced friction during extrusion-machining.

Fixture Features:

  • Chip compression ratio: 1.4
  • EN8 tool holder with brazed tungsten carbide insert.
  • The fixture was employed to produce low cost ultra fine grained Ti-6Al-4V foils from its bulk.
  • Having design and fabrication of a fixture which acts as a constraint during large strain extrusion machining process
Questions about this Technology?

Contact for Licensing

Research Lab

Prof. Murthy H S N

Department of Aerospace Engineering 

Prof. Balakrishna C Rao

Department of Engineering Design

Intellectual Property

  • IITM IDF Ref. 1386
  • Patent No: IN 365294

Technology Readiness Level

TRL-4

Experimentally validated in Lab;

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