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    • 3. 发明申请
    • APPARATUS AND METHODS FOR TWIN SHEET THERMOFORMING
    • 双面热成型设备及方法
    • WO99037465A1
    • 1999-07-29
    • PCT/NZ1999/000006
    • 1999-01-21
    • B29C49/00B29C49/50B29C51/32B29C65/00B29C69/00
    • B29C66/3282B29C49/0047B29C49/50B29C51/267B29C51/32B29C66/1122B29C66/43B29C66/431B29C66/43121B29C66/71B29K2055/02
    • A method of twin sheet thermoforming is provided in which the seam (1) between sheets (7, 8) is trimmed from the finished part by a shearing action between cooperating edges of the mould halves (3, 4). In the preferred from of the invention one mould half (4) is provided with a moveable pinch-off region (13) which retracts under pressure from the other mould half (3) to leave an edge of the mould half (4) adjacent the mould cavity which cooperates with an edge of the mould cavity of the other mould half (3) to provide the shearing action. The moveable pinch-off region may be a pinch-off member (13) supported in an annular channel (14) by a pre-compressed spring (15). The invention allows significant plastic displacement of the material in the seam region for weld reinforcement along with trimming of the seam from the formed part within the mould in a one step process.
    • 提供了一种双板热成型方法,其中通过半模(3,4)的配合边缘之间的剪切作用,在成品部分之间修剪薄片(7,8)之间的接缝(1)。 在本发明的优选方案中,一个半模(4)设置有可移动的夹紧区域(13),该区域在另一半模(3)的压力下缩回,以使模具半部(4)的边缘邻近 模腔与另一半模(3)的模腔的边缘配合以提供剪切作用。 可移动夹紧区域可以是通过预压缩弹簧(15)支撑在环形通道(14)中的夹断构件(13)。 本发明允许在接缝区域中用于焊接加强件的材料的显着的塑性位移以及在一步工艺中从模具中的成形部件修剪接缝。