Mechanical hydroforming with improved lubrication
    3.
    发明授权
    Mechanical hydroforming with improved lubrication 失效
    机械液压成型,改善润滑

    公开(公告)号:US06532784B1

    公开(公告)日:2003-03-18

    申请号:US09786404

    申请日:2001-04-02

    IPC分类号: B21D915

    摘要: A process of mechanical hydroforming, in which a hollow tube is caused to expand against the interior surface of a die that surrounds the tube by hydraulic pressure applied to a liquid that fills the interior of the tube, is improved by coating the part of the exterior surface of the tube that comes into contact with the die surface against which it expands with a wax that is solid at normal room temperature but can be maintained fully melted and in contact with air, without showing any visible evidence of decomposition, at a temperature that is at least 75 degrees C. Preferably, the wax is applied to the surface to be hydroformed by spraying from melt onto the surface while the latter is maintained above the melt temperature of the wax. Shortly after the wax has been thus applied to the surface, the wax is cooled until it solidifies. Most preferably, the wax is an “oxidized hydrocarbon” wax that is about 95% hydrocarbon and 5% straight chain carboxylic acids and contains a wide variety of molecular weights of both hydrocarbons and carboxylic acids.

    摘要翻译: 一种机械液压成型方法,其中使中空管通过施加到填充管内部的液体的液压而围绕管的模具的内表面膨胀,通过涂覆外部的一部分而得到改善 与模具表面接触的管的表面,其与其在正常室温下为固体的蜡膨胀,但是可以保持完全熔化并与空气接触,而不显示任何明显的分解迹象,温度在 至少为75摄氏度。优选地,蜡通过从熔体喷射到表面上而被施加到待加氢成形的表面上,同时将蜡保持在蜡的熔融温度以上。 在将蜡施加到表面之后不久,将蜡冷却直到其固化。 最优选地,蜡是约95%烃和5%直链羧酸的“氧化烃”蜡,并且含有各种各样的烃和羧酸的分子量。