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    • 8. 发明申请
    • METHOD AND BENDING TOOL FOR BENDING PIPES OVER A MANDREL, AND BENDING TOOL
    • 方法和弯曲工具用于弯曲管子荆棘缠身工具的弯曲
    • WO2010025883A2
    • 2010-03-11
    • PCT/EP2009006301
    • 2009-09-01
    • UNI SIEGENENGEL BERNDCORDES STEFANMATHES CHRISTIAN
    • ENGEL BERNDCORDES STEFANMATHES CHRISTIAN
    • B21D7/02B21D7/022B21D9/07
    • B21D9/073
    • The invention relates to a method and a device for bending pipes (3) over a mandrel (6), in particular pipes having thin walls, on a rotary draw bending tool (1), which comprises a bending template (2), a slide rail (4) which is arranged above the pipe and which holds the pipe and the mandrel in position, and at least one upper, outer clamping jaw (7), which, rotating by a bending angle, presses the pipe (3) against the bending template (2). The invention also relates to a bending tool (1) and to a beading tool suitable for the method or for the bending tool. According to the method, in order to prevent the formation of folds, a tensile force applied to the pipe (3) during the bending process and therefore the trailing of pipe material in the bending zone on the inside (3b) of the pipe bend (3a) are retarded by at least one mandrel retaining means which can be placed against the mandrel shaft, wherein tensile stress is introduced at the pipe bend inner radius and the critical compressive stress leading to fold formation is no longer met.
    • 本发明涉及一种方法和用于在芯棒弯曲管件(3)(6),具有薄壁尤其管(1)上,其包括一个弯曲模板(2),设置在所述管滑动装置上方的旋转拉伸弯曲工具的装置( 4)保持在管和在位置折弯心轴,和至少一个上部外夹爪(7),该推压(由旋转管(3的弯曲角度)到弯曲模板2)。 此外,本发明涉及一种弯曲工具(1)和适用于该方法或用于弯曲工具卷边冲压。 为了防止皱纹的形成,所以建议在程序上,通过至少一个无业靠在弯曲心轴杆弯曲心轴夹持装置包括一个在弯曲过程中在管(3)所施加的拉伸力,从而管材料在弯曲区的狩猎上的内侧(图3b)的弯管(3 一)进行制动,其特征在于,在所述管的弯曲半径引入的拉伸应力,并且内导致皱纹临界压缩应力超过。