Nontraditional Machining คลิก รูปลำโพงจะมีเสียงบรรยาย Dr.Apiwat Muttamara.

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Presentation transcript:

Nontraditional Machining คลิก รูปลำโพงจะมีเสียงบรรยาย Dr.Apiwat Muttamara

Review of Machining Machining is a generic term, applied to material removal processes. Traditional machining: turning, milling, drilling, grinding, etc. Metal cutting refers to processes in which excess metal is removed by a harder tool, through a process of extensive plastic deformation or controlled fracture. Non-traditional machining: chemical machining, ECM, EDM, EBM, LBM, machining of non-metallic materials.

Nontraditional Machining Chemical Machining (CM) Electrochemical machining Electrical discharge machining High energy beam machining Water jet/Abrasive water jet machining Ultrasonic machining Machining of non-metallic materials

Chemical Machining (Chemilling) Used to produce shallow cavities (<12mm) on large areas. A maskant is applied over areas you don’t want to machine. Place the part in a chemical bath (acid or alkali depending upon the metal) Control temperature and time of exposure to control material removal Material removal rate is slow, mm/min

Innert Mat.Such as rubber or Plastic

Chemical Machining Etching: Chemical reaction between reagent (in gas, solution, or paste form) and workpiece. Main uses: - Shallow, wide cavities on plates, forgings, castings  reduce weight -Electronics manufacturing (Lead frames) -Hydrogen Fluoride

Lead frame For IC

UV Lithography uses image transfer technology to create a precise, acid-resistant image of a part on a flat piece of metal. Chemicals are applied that etch away the uncoated metal around the part image. The result is a high precision part that has not been stressed or had its material properties altered.

Photo-Chemical Machining Innert Mat.Such as rubber or Plastic Negative artwork object UV light The UV light react with photographic developing technique Immerse to chemical bath that fixes the exposed layer React with chemical

Works on the principle of electrolysis Die is progressively lowered into workpiece as workpiece is dissociated into ions by electrolysis Electrolytic fluid flows around workpiece to remove ions and maintain electrical current path anode (the workpiece) is dissolved into ions and the tool is slowly lowered, maintaining a constant distance between it and the workpiece. Low DC voltage, very High current (700 amps). Material removal rate is mm/min depending on current density.

Electrochemical Machining (ECM) Reverse of electro-plating (workpiece is anode) Anode

Electrochemical Machining (ECM)

Main uses: - Dies and glass-making molds, turbine and compressor blades, Holes, Deburring Due to low forces on tool ECM can be used to make holes at very large angle toa surface an example is shown in the turbine nozzleholes