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เคร่ืองที่ใช้ควรเป็น Triple action press PRESS

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HYDROFORMING

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1. Close die  The starting tube ‐ a straight or pre‐bent tubular section ‐ is placed into a die which has the contour of the component to be produced. 

The Process - in four steps to the finished hydroformed part

2. Fill with water The die is closed and held closed by means of a hydraulic press and kept under pressure. Hydraulically actuated sealing punches close off the tube ends and fill the tube with the fluid medium, thus building up internal pressure.  

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3. Move horizontal cylinders, regulate water pressure, move counter holder  In the actual forming process the material is expanded. At the same time the sealing punches compress the tube ends. This causes the material to flow into the contour of the die. A precise control of the internal pressure and of the axial cylinder movement enables that the material takes on the form of the internal die contour and the component gets its final shape.  

4. Open press, unload component After hydroforming the hydraulic press opens the die for unloading the component  

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a b

c d

Faxial Faxial

P

e f

Tube Hydroforming

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Complete

Open Model

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Hydroformed Side Rails on a Truck Chassis

Hydroformed Exhaust Parts

Hydroformed Cam Shafts have Lower Rotational Inertia and Require Less Machining

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ELECTROMAGNETIC FORMING EMF

Electro-Magnetic Forming

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Operating principle of electromagnetic metal forming process

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Basic Methods of EMF

Compression forming

Expansion forming

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Basic Methods of EMF

Contour forming

Electro magnetic actuator

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Improve stamping operation

• Improved Formability —at high velocity.

• Improved strain distribution

• Reduction in wrinkling

• Active control of springback

• Distortions at local features are minimized

• Local coining

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A demonstration of the ability to add character lines without distortion and/or wrinkling with full-size aluminum hood.

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