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24 条记录 (耗时 0.01 秒)

    Process and apparatus for manufacturing single piece railroad ties of prestressed concrete
    7.
    发明授权
    Process and apparatus for manufacturing single piece railroad ties of prestressed concrete 失效
    预应力混凝土单片铁路连接件的制造和设备

    公开(公告)号：US4273740A

    公开(公告)日：1981-06-16

    申请号：US082481

    申请日：1979-10-09

    申请人： Sergio Marchesi ,  Gino Fachin

    发明人： Sergio Marchesi ,  Gino Fachin

    IPC分类号： B28B11/24 ,  B28B23/04 ,  B28C7/00 ,  E01B3/34 ,  B28B21/78

    CPC分类号： B28C7/003 ,  B28B11/245 ,  B28B23/04 ,  E01B3/34 ,  Y10S264/43

    摘要： A process and apparatus are disclosed for production casting of railroad ties and the like to obtain maximum mold utility. The casting is accomplished by arranging tendons within a mold and subjecting them to an appropriate tensile stress. Uncured concrete is then introduced at a temperature of around 80.degree. C.-90.degree. C. The mold is vibrated and subsequently closed. It is then maintained at 60.degree. C.-80.degree. C. for a time sufficient to cure the concrete such that the prestressing mechanism can be released. The mold may then be immediately re-used. One mechanism by which the molds may be closed during the curing process in most efficient manner is to employ succeeding molds in a stacked arrangement to cover each preceding mold cavity. A single piece conical locking member is also employed to anchor the tendon in the mold.

    摘要翻译： 公开了用于铁路连接件等的生产铸造以获得最大模具效用的方法和装置。 铸造是通过在模具内布置钢筋并使它们受到适当的拉伸应力来实现的。 然后在约80℃-90℃的温度下引入未固化的混凝土。模具振动并随后封闭。 然后将其在60℃-80℃下保持足以固化混凝土的时间，使得可以释放预应力机构。 然后可以立即重新使用模具。 以最有效的方式在固化过程中可以关闭模​​具的一种机构是采用堆叠布置的后续模具来覆盖每个在前的模腔。 还使用单件式锥形锁定构件将腱固定在模具中。

    Molding apparatus
    8.
    发明授权
    Molding apparatus 失效
    成型设备

    公开(公告)号：US3880563A

    公开(公告)日：1975-04-29

    申请号：US37705973

    申请日：1973-07-06

    申请人： PITTSBURGH CORNING CORP

    发明人： DEVOS DANIEL A

    IPC分类号： B29C33/04 ,  B29C51/36 ,  B29C51/42 ,  B28B21/78

    CPC分类号： B29C51/428 ,  B29C33/04 ,  B29C51/36

    摘要： A shell having an outer surface with the configuration of a surface of the molded or shaped product is fabricated from several layers of a resinous thermosettng compound. Heat sink elements are embedded in the shell adjacent to the outer surface of the shell and have portions extending into the shell cavity. The shell cavity has a porous fill comprising substantially spherical cellular ceramic nodules bonded to each other and having interconnecting interstitial voids. The open end portion of the shell is sealed by a layer of resinous material with a fluid inlet and outlet for circulation of cooling fluid through the shell cavity. A plurality of capillaries extend from the outer surface of the shell to a common conduit which provides a suction or negative pressure between the mold outer surface and the material to be shaped. The mold is constructed by first applying a thin layer of thermosetting resin or low melt metallic alloy to the surface of a pattern having guide pins with capillary tubes thereon. A second layer of resin is applied to the first layer and the heat sink elements are embedded in the second layer closely adjacent to the first layer. A third relatively thick structural layer of thermosetting resin including fillers is applied to the first layer to form the mold shell. The inner cavity of the mold shell is filled with a mixture of cellular ceramic nodules and thermosetting resin to form a relatively rigid porous fill having interconnecting interstitial voids. The capillary tubes are connected to a common conduit in a separation box. The cavity is sealed by a layer of resinous material with fluid inlet and outlet connections therein. The mold so formed is suitable for use in either vacuum, extrusion or blowing molding processes.

    摘要翻译： 具有模制或成形产品的表面的外形的外壳由几层树脂热固化合物制成。 散热元件嵌入外壳中，与外壳的外表面相邻，并具有延伸到壳腔中的部分。 壳腔具有包括基本上球形的细胞陶瓷结块的多孔填充物，其彼此结合并具有互连的间隙。 壳体的开口端部由树脂材料层密封，流体入口和出口用于使冷却流体通过壳腔循环。 多个毛细管从外壳的外表面延伸到共同的导管，其在模具外表面和待成形材料之间提供吸力或负压。 该模具通过首先将薄层的热固性树脂或低熔点金属合金施加到具有其上具有毛细管的导销的图案的表面上。 将第二层树脂施加到第一层，并且散热元件嵌入在与第一层紧密相邻的第二层中。 将包括填料的第三相对较厚的热固性树脂结构层施加到第一层以形成模壳。 模具壳体的内腔充满细胞陶瓷结节和热固性树脂的混合物，以形成具有相互间隙空隙的相对刚性的多孔填料。 毛细管连接到分离箱中的公共管道。 空腔由一层树脂材料密封，其中具有流体入口和出口连接。 如此形成的模具适用于真空，挤压或吹塑成型工艺。