Abstract: The device having a die formed by a cushion (2) composed of an elastically yieldable material, such as for example an elastomer, disposed in a retaining box (1), a mechanism for predrawing a sheet blank (6), constituted by an outer slide carrying an upper blank holder (4a), a mechanism for finally drawing said sheet blank (6), constituted by a central slide acting on a plunger (5), and a first mechanism (10) for absorbing excess volume of the cushion (2) relative to the volume determined by the surface of the finished part to be obtained in the course of the final drawing of the part. The device further comprises at least one second mechanism (20) for compensating for the excess volume of the cushion (2) due to variations in physical characteristics of the material of the cushion.

Abstract: The invention relates to a process for depositing a latex coating on an article made of elastomer,wherein a continuous layer of a hydrophilic inorganic pulverulent material is deposited at the surface of the elastomer and the said article is immersed in an aqueous latex suspension.The invention also relates to a composite article based on silicone elastomer comprising a latex coating, said composite article including a film made up of a hydrophilic inorganic pulverulent material at the interface between the silicone elastomer and the latex.

Abstract: A device is provided for stamping materials in sheet form, especially sheet metal blanks (5), on a single-acting press. The device includes a cushion (2) made from an elastic material, forming a punch and housed in a retention dish (1) and means for preforming and permanently forming the sheet metal blank (5). The preforming and permanent forming means are arranged in a die (6) including a framework (8), an upper peripheral blank-clamp (9) connected to the framework (8) by at least on elastic member (11) for reaction, strain relief and retention and a die bottom (10) arranged in the upper peripheral blank-clamp (9). The upper peripheral blank-clamp (9) and the die bottom (10) are mounted so as to slide relative to one another and include means (13) for instantaneously linking them together.

Abstract: A device is provided for drawing sheet materials, in particular, sheet blanks. The device includes a cushion of elastic material disposed in an enclosure, a die for forming the sheet blank, the die having a peripheral portion constituting an upper blank holder. The device also includes a lower blank holder for supporting and maintaining at least a portion of the sheet blank which is placed directly on the cushion of elastic material and cooperates with the upper blank holder for clamping the sheet blank in at least localized zones. The lower blank holder bears against a slidable element disposed around lateral faces of the cushion.

Abstract: In the method for blanking out a sheet material (1) between a punch (4) and a die (6) having a sharp edge (7), the punch (4) is formed by a heterogeneous composite elastic material having localized regions (4a) having a relatively higher hardness, and complementary regions (4b) having a relatively lower hardness.

Abstract: Pressing sheet material with a device comprising a cushion (6) composed of an elastic material, comprising disposing a sheet blank (3) to be formed on a support constituting a lower peripheral blank holder (2a), applying an upper blank holder (1a) on the peripheral portion of the sheet blank (3) for preforming the blank, then applying a punch (4) on the central portion of the sheet blank (3) for effecting the final forming, wherein, in the course of the final forming, the excess volume of the elastic cushion (6), produced by the application of the punch (4), relative to the volume determined by the surface area of the finished part to be obtained, is absorbed.

Abstract: Device for pressing sheet material blanks, in particular sheet metal blanks (10), comprising a cushion (2) composed of an elastic material disposed in a retaining box (1), an arrangement for performing the sheet blank constituted by an outer slide carrying an upper blank holder (6), and an arrangement for finally forming the sheet blank constituted by a central slide acting on a punch (8), the device further comprising a lower blank blank holder constituted by an element (3) for supporting and maintaining at least a portion of the sheet blank (10), placed directly on the elastic cushion (2) and cooperative with the upper blank holder (6) for gripping the sheet blank in at least localized region of the blank.

Abstract: Method for pressing sheet material, in particular sheet metal, on a press by way of a cushion (12) composed of an elastic material, comprising disposing a sheet blank (20) to be formed on a support whose peripheral part forms a lower blank holder (2) and whose central part constitutes a die (3), applying, under the action of an outer slide, an upper blank holder (9) on the peripheral portion of the sheet blank (20), then applying a punch (11) under the effect of a ram, the method further comprising, in the course of a first step, applying, under the action of the ram, the cushion (12) on the sheet blank (20) for preforming the sheet blank in such manner as to impart thereto a surface area substantially equal to the surface area of the finished part to be obtained, then, in the course of a second step, continuing, under the action of the ram, the descent of the elastic cushion (12) and simultaneously displacing all or a part of the bottom of the die (3) for achieving the final shaping of the part.

Abstract: In an apparatus for blanking out a sheet material (1) between a punch (4) and a die (6) having a sharp edge (7), the punch (4) is formed by a heterogeneous composite elastic material having localized regions (4a) having a relatively higher hardness, and complementary regions (4b) having a relatively lower hardness.