Advanced Machining Processes UToledo （先进的加工工艺,UToledo）.ppt

Advanced Machining Processes Manufacturing Processes Outline Chemical Milling Photochemical Blanking Electrochemical Machining Pulsed Electrochemical Machining Electrochemical Grinding Electrical-Discharge Machining Electrical-Discharge Grinding Electrical-Discharge Wire Cutting Laser-Beam Machining Electron Beam Machining Plasma Arc Cutting Water Jet Machining Abrasive Water Jet Machining Abrasive Jet Machining Examples of Parts Chemical Milling Produces shallow cavities on a workpiece, usually to reduce weight The area affected by the chemical reagent is controlled by masking or by partial immersion Chemical Milling Chemical Milling Procedure: Relieve residual stresses to prevent warping Clean the material surface Apply masking material Remove the masking on regions that require etching Apply the reagents Wash the part Remove remaining masking Additional finishing or chemical milling procedures may be used Photochemical Blanking Uses chemicals and photographic processes to remove material, usually from a thin sheet Can produce complex shapes on metals as thin as .0025 mm without forming burrs Photochemical Blanking Examples of Parts Photochemical Blanking Procedure: Prepare the design at a magnification of up to 100x; make a photographic negative and reduce it to the size of the part Coat the blank with photosensitive material Place the negative over the part and expose it to ultraviolet light to harden the exposed photosensitive coating Dissolve the unexposed coating Apply the chemical reagent Remove the masking and wash the part Chemical Machining Design Considerations: Avoid sharp corners, deep narrow cavities, steep tapers, folded seams and porous workpieces Undercuts may develop Most of the workpiece should be shaped by other processes to speed production Variations may occur depending onhumidity and temperature Computerized designs must be converted to a format compatible with the photochemical artwork equipment Electrochemical Machining Uses an electrolyt