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    • 3. 发明授权
    • One-piece hollow camshafts and process for producing same
    • 一体式中空凸轮轴及其制造方法
    • US5960660A
    • 1999-10-05
    • US111760
    • 1998-07-08
    • Friedrich KlaasHelmut Bogel
    • Friedrich KlaasHelmut Bogel
    • F01L1/04B21D26/02B21D53/84F01L1/047F16H53/00F16H53/02B21D22/10
    • B21D53/845F01L1/047F16H53/025Y10T29/49293Y10T29/49945Y10T74/2101
    • The invention relates to a hollow camshaft consisting of a metal or metal alloy or plastic which can be cold-formed and heat-treated and has a fiber flow parallel to the exterior contours of the camshaft, and to a method for producing it comprising the steps of:Placing a pipe outlet element and filling it with fluid;Sealing at least the pipe section to be widened;Applying an internal high pressure suitable for widening the pipe section to produce an intermediate product pre-form, wherein, while the internal high pressure is applied, the hollow pipe is compressed against a movable die in the direction of its long axis in such a way that accumulations of material occur at approximately those places where it is intended to create cams;Shaping the intermediate product pre-form into a shape corresponding to a final camshaft shape by means of the internal high pressure shaping method, so that cams are shaped at the desired locations;If necessary, finishing the cams by heat-treatment.
    • 本发明涉及一种由金属或金属合金或塑料组成的空心凸轮轴,其可以被冷成形和热处理并且具有平行于凸轮轴的外部轮廓的纤维流,并且涉及一种生产它的方法,包括步骤 放置管道出口元件并用流体填充; 密封至少要加宽的管段; 施加适合于加宽管段的内部高压以产生中间产品预成型件,其中,当施加内部高压时,中空管以这种方式沿其长轴方向压靠在可动模具上 材料的积聚发生在大约在那里要制造凸轮的地方; 通过内部高压成形方法将中间产品预成型件形成对应于最终凸轮轴形状的形状,使得凸轮在期望的位置成形; 如有必要,通过热处理完成凸轮。
    • 4. 发明授权
    • One-piece hollow camshafts and process for producing same
    • 一体式中空凸轮轴及其制造方法
    • US5850695A
    • 1998-12-22
    • US648072
    • 1996-07-12
    • Friedrich KlaasHelmut Bogel
    • Friedrich KlaasHelmut Bogel
    • F01L1/04B21D26/02B21D53/84F01L1/047F16H53/00F16H53/02C21C7/04
    • B21D53/845F01L1/047F16H53/025Y10T29/49293Y10T29/49945Y10T74/2101
    • A method for producing a hollow camshaft comprising i) forming a camshaft preform by providing a hollow metal pipe, expanding the hollow pipe at spaced longitudinal locations by applying pressurized fluid internally to the hollow pipe, axially compressing the hollow pipe during the expanding step to accumulate metal at the spaced longitudinal locations, the expanding and compressing steps forming a camshaft preform having cam preforms of associated predetermined widths in a longitudinal pipe direction; and ii) forming a final camshaft from the camshaft preform by axially compressing the camshaft preform while applying the pressurized fluid to reduce the predetermined widths of the cam preforms while shaping the camshaft preforms into the final camshaft, the final camshaft having cams of relatively smaller widths in the longitudinal direction than the predetermined widths of the cam preforms.
    • PCT No.PCT / DE94 / 01218 Sec。 371日期:1996年7月12日 102(e)日期1996年7月12日PCT 1994年10月14日PCT PCT。 公开号WO95 / 14851 日期1996年6月1日制造中空凸轮轴的方法,包括:i)通过设置中空金属管来形成凸轮轴预制件,通过在中空管内部施加加压流体,在间隔开的纵向位置膨胀中空管, 在间隔开的纵向位置上积累金属的膨胀步骤,所述膨胀和压缩步骤形成凸轮轴预制件,所述凸轮轴预制件具有在纵向管道方向上具有相关联的预定宽度的凸轮预制件; 以及ii)通过在施加所述加压流体的同时轴向压缩所述凸轮轴预制件来形成所述凸轮轴预制件的最终凸轮轴,以在将所述凸轮轴预制件成形为最终凸轮轴的同时将所述凸轮预制件的预定宽度减小,所述最终凸轮轴具有相对较小宽度的凸轮 在纵向方向上比凸轮预制件的预定宽度。