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    Powder pressing apparatus and powder pressing method
    4.
    发明公开
    Powder pressing apparatus and powder pressing method 有权
    粉末压制设备和粉末压制方法

    公开(公告)号：EP0999039A2

    公开(公告)日：2000-05-10

    申请号：EP99121569.0

    申请日：1999-10-29

    申请人： SUMITOMO SPECIAL METALS CO., LTD.

    发明人： Kohara, Seiichi ,  Harada, Tsutomu

    IPC分类号： B30B15/00

    CPC分类号： B30B15/0011 ,  B29C43/361 ,  B29C2043/3233 ,  B29C2043/3618 ,  B29C2043/566 ,  B30B15/0017

    摘要： A powder pressing apparatus comprises an upper punch (16) and a lower punch for compression of a powder in a cavity formed in a through hole (12) of a die (14). A gap between a side surface of the lower punch (18) and a side surface of the through hole (12) of the die (14) is sealed by a sealing member. A lubricant is supplied with a gas from a nozzle in the side surface of the lower punch (18) to the side surface of the through hole, and the lubricant applied to the side surface of the through hole (12) is spread by an absorbing member (48). The cavity is filled with the powder while the cavity is under suction by a reduced pressure provided from the nozzle in the side surface of the lower punch. During the suction, a filtering member provides filtration for the lower punch not to draw the powder in.

    摘要翻译： 一种粉末压制设备包括用于将粉末压缩在模具（14）的通孔（12）中形成的空腔中的上冲​​头（16）和下冲头。 下冲头（18）的侧面与模具（14）的贯通孔（12）的侧面之间的间隙被密封部件密封。 从下冲头（18）的侧面向通孔侧面供给来自喷嘴的气体的润滑剂，通过吸附剂将涂布于贯通孔（12）的侧面的润滑剂扩散 成员（48）。 当空腔在下冲头的侧面由喷嘴提供的减压下被吸入时，空腔被填充粉末。 在抽吸期间，过滤部件为下冲头提供过滤而不将粉末吸入。

    GAS-ASSISTED INJECTION MOULDING METHOD AND APPARATUS
    9.
    发明授权
    GAS-ASSISTED INJECTION MOULDING METHOD AND APPARATUS 失效
    BY气体辅助注塑和设备

    公开(公告)号：EP0624121B1

    公开(公告)日：1997-09-03

    申请号：EP93914510.8

    申请日：1993-02-01

    申请人： HAYWOOD HOLDINGS LIMITED

    发明人： PEARSON, Terence Colwyn

    IPC分类号： B29C45/17

    CPC分类号： B29C45/174 ,  B29C2043/566 ,  B29C2045/1741

    摘要： A conventional injection moulding process is modified in order to improve the quality of moulding in respect of the surface finish of one side of the moulding (1.16), reduce moulded-in stress and thereby reduce tendency to warp, and with increased scope for adding additional design features. This is achieved by the injection of a controlled amount of gas into the mould cavity to form a film (1.11) or layer of gas between one side of the mould cavity (1.12) and the adjacent skin of the substantially molten plastic (1.13) during or after filling of the mould with the plastic. This enables pressure to be exerted on the plastic by the gas of which the pressure is controlled from an external source (1.15). This invention includes methods of sealing the gas within the mould to prevent leakage thereby enabling the gas pressure to be controlled. The invention also includes methods of pressuring localised protrusions from the moulding general wall such as pillars, bosses, webs, ribs etc.