MICROMACHINING Presented by Sudheesh K N S 7 Mechanical.

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Presentation transcript:

MICROMACHINING Presented by Sudheesh K N S 7 Mechanical

Introduction  Implies parts are made to the size of 1 to 999µm  By the definition micro engg: as the field where component sizes are a few millimeters

Important aspects  Unit removal  Equipment precision

Classification According to Machining phenomena 1. Removal by mechanical force 2. Removal by ablation 3. Removal by dissolution 4. Plastic deformation

Laser micro machining  Uses a power source (FS laser, Excimer laser) that emits a beam with very high quantum energy.

Laser Micromachining Process

Conceptual Solid Model of Laser Micromachining Setup

Advantages of Laser Micromachining Non-contact machining Very high resolution, repeatability and aspect ratios Localized heating, minimal redeposition No pre/post processing of material Wide range of materials: fragile, ultra-thin and highly reflective surfaces Process can be fully automated

Characteristics of Femtosecond Laser Micromachining Very high peak powers in the range W/cm 2 provide for minimal thermal damage to surroundings Very clean cuts with high aspect ratios Sub-micron feature resolution Minimal redeposition Possible to machine transparent materials like glass, sapphire etc

Ultrashort Pulses vs. Long Pulse Micromachining

Femtosecond Laser Micromachining

Micromachining in 18μm Thick Aluminum Foil

Holes Drilled in 25μm Thick Brass Foil

Ablation Rate vs. Energy Density in 18  m Thick Aluminum Foil

Optimization of Pulse Energy Required to Drill Holes

Automation of Laser Micromachining Process

Application of micromachining Micro milling Micro grinding Chemical etching Micro punching Manufacturing of injection nozzles, Micro surgical tools, VLSI circuits

Conclusion As regards micro machining, dimensions of the product is one of the good indicator of the levels of technology and request. However, the level of request from the industry varies widely.