公开(公告)号：US4621514A

公开(公告)日：1986-11-11

申请号：US650348

申请日：1984-09-13

Applicant: Fritz Dohmann ,  Peter Franz ,  Friedrich Klaas ,  Gunter Schulze

Inventor： Fritz Dohmann ,  Peter Franz ,  Friedrich Klaas ,  Gunter Schulze

IPC: B21K1/04 ,  B21K21/00 ,  B21K23/04 ,  H01R43/06 ,  B21D22/00

CPC classification number: H01R43/06 ,  B21K21/00 ,  B21K23/04 ,  Y10T29/49011

Abstract: To form a commutator segmental ring, an intermediate stage commutator ring (4) is formed from a flat strip (1) of commutator material which is bent into essentially cylindrical tubular shape to form a blank (2) having a gap or crack (3) adjacent the ends of the strip. The commutator ring, upon forming of the commutator, is severed into commutator segments. The gap or crack of the blank is aligned with a ridge or rib in a forming punch press to form a groove within the essentially cylindrical tubular blank (2) so that, when the intermediate stage commutator ring (4) is made, a cylindrical portion (5) already dimensioned for the intermediate segmental ring and a flange portion (6) are made, with a groove in alignment with the gap or crack obtained during cold-flowing of the metal in the press by the guidance afforded by the rib or ridge in the gap or crack of the cylindrical tubular blank. Preferably, the ridge or rib, defining the groove, extends in a plane which passes through the axis of the cylindrical portion (5) of the intermediate commutator ring (4) and extends radially therefrom through the center line of the groove. The apparatus includes multiple concentric punch, stamp and die elements to permit cold-flowing of the cylindrical tubular blank upon compression of the commutator metal which, typically, is copper.

Abstract translation: 为了形成换向器分段环，中间级换向器环（4）由换向器材料的扁平条（1）形成，该整流子材料弯曲成基本上为圆柱形的管状，以形成具有间隙或裂纹（3）的坯料（2） 邻近条带的端部。 换向器环在换向器形成时被切换成换向器段。 坯料的间隙或裂纹与成形冲压机中的脊或肋对齐，以在基本上圆柱形的管坯（2）内形成凹槽，使得当制成中间级换向器环（4）时，圆柱形部分 已经为中间节段环设置尺寸的凸缘部分（5）和凸缘部分（6），其中凹槽与通过肋条或凸条提供的引导在压力机内的金属冷流期间获得的间隙或裂缝对齐 在圆柱形管状坯料的间隙或裂缝中。 优选地，限定凹槽的脊或肋在穿过中间换向器环（4）的圆柱形部分（5）的轴线的平面中延伸并且从其径向延伸穿过凹槽的中心线。 该装置包括多个同心冲头，印模和模具元件，以在压缩换向器金属（通常为铜）时允许圆筒形管状坯件的冷流动。

公开(公告)号：US4008599A

公开(公告)日：1977-02-22

申请号：US617008

申请日：1975-09-26

Applicant: Fritz Dohmann

Inventor： Fritz Dohmann

IPC: B21J5/02 ,  B21J13/02 ,  B21K1/30 ,  B21D22/00 ,  B21D53/28

CPC classification number: B21K1/30 ,  Y10T29/49474

Abstract: A die with bevel gear-forming cavity, a punch and a sleeve-like counter punch are constructed for press-forming cylindrical blanks. The punch has a diameter about equal to the circle defined by the intersection of the pitch cone with the low diameter bottom of the die cavity. The counter punch has a frusto-conical projection reaching in the cavity and is held until the die cavity is filled underneath, whereafter the counter punch retracts at a declining speed to fill the remainder of the cavity by radial flow.

Abstract translation: 具有锥齿轮形成腔的模具，冲头和套筒状的反冲头被构造用于压制成形的圆柱形坯料。 冲头具有大约等于由锥形锥体与模腔的低直径底部相交的圆形的直径。 反冲头具有到达腔体的截头圆锥形突起并且被保持直到模腔在下面填充，之后反冲头以降低的速度缩回，以通过径向流量填充空腔的其余部分。