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    • 2. 发明授权
    • Process and apparatus for vacuum forming
    • 真空成型工艺及装置
    • US5128090A
    • 1992-07-07
    • US625051
    • 1990-12-10
    • Tetsuya FujiiToru KaiAkiyoshi NaganoToshihiko Mori
    • Tetsuya FujiiToru KaiAkiyoshi NaganoToshihiko Mori
    • B29C51/36B29C51/10B29C51/14B29C51/18B29C51/26
    • B29C51/18B29C51/145B29C51/10B29K2995/0077
    • A vacuum forming process, and an apparatus for carrying out the same, for imparting a predetermined shape to a sheet material. The process includes the steps of placing a thermally softened sheet material onto a molding surface of a mold and evacuating air remaining between the molding surface of the mold and the sheet material, thereby bringing the sheet material into a close contact with the molding surface of the surface of the mold. The vacuum forming process and apparatus is adapted for giving a predetermined shape to a sheet material having a low elongation ratio. In particular, when giving a predetermined shape to the sheet material, part of the sheet material is pressed with a pressing member against the molding surface of the mold, a peripheral portion of the sheet material is held with a holding member, and holding forces exerted by a plurality of holding portions of the holding member are varied in order to control movement amounts of the sheet material resulting from a pressing force of the pressing member. In this manner, a predetermined shape can be given to a sheet material without causing wrinkles thereto, even when the sheet material has a low elongation ratio.
    • 一种真空成型工艺及其执行装置,用于将预定形状赋予片材。 该方法包括以下步骤:将热软化的片材放置在模具的模制表面上并排出留在模具的模制表面和片材之间的空气,从而使片材与模制表面紧密接触 模具表面。 真空成型工艺和设备适用于对具有低伸长率的片材赋予预定的形状。 特别地,当向片材材料形成预定的形状时,片材的一部分被按压部件压靠在模具的成型表面上,片材的周边部分被保持部件保持,并且施加保持力 通过保持构件的多个保持部分被改变,以便控制由按压构件的按压力产生的片材的移动量。 以这种方式,即使片材具有低伸长率,也可以对片材赋予预定的形状而不引起褶皱。