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A punch for forming an intricate shape in a material is formed of a porous material to allow application of a vacuum through the punch to the material to form its intricate shape.
English (United States)
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Porous Punch for Forming an Intricate Shape
A punch for forming an intricate shape in a material is formed of a porous
material to allow application of a vacuum through the punch to the material to
form its intricate shape.
A mold for forming an intricate shape in a polyester substrate 1, which may
be formed to function as a snap spring f membrane switch, for example, includes
a die plate 2, a vacuum chamber plate 3, and a top plate 4. The top plate 4 has
a layer 5 of silicone rubber attached to its bottom surface to push the polyester
substrate 1 around a sintered punch 6, which is supported in the die plate 2 and
has its upper end of a desire shape to form the polyester substrate 1 to an
A vacuum chamber 7, which has a vacuum applied thereto, is formed
between the vacuum chamber plate 3 and the die plate 2. The vacuum chamber
7 communicates with the bottom of the sintered punch 6 adjacent its support stud 8. This enables a vacuum to be applied through the sintered punch 6 to hold the
polyester substrate 1 against the top of the punch 6. The top plate 4, which is
movable relative to the die plate 2 and the vacuum chamber plate 3, applies
pressure and heat through the silicone rubber layer 5 to shape the polyester
substrate 1 in cooperation with the shape of the upper end of the punch 6.