Emuge-werk Richard Glimpel Gmbh & Co Kg Fabrik Fur Prazisionswerkzeuge

Emuge-werk Richard Glimpel Gmbh & Co. Kg Fabrik Für Praäzisionswerkzeuge

Thomas Berschneider

Helmut Glimpel

Dietmar Hechtle

Thomas A Zeus

Jurgen Fenzel

Jürgen Fenzel

Thomas Zeus

A thread former for the chipless production of a thread has a plurality of pressing lands, which are each arranged at predefined separation angles (T) along a shaping curve. Each separation angle (T) is smaller than or equal to a predefined maximum separation angle (T). For nominal thread former diameters (Da) between 6 mm and 20 mm, the maximum separation angle (T) is determined such that the following condition: T=sin((a&#xd7;ND+b&#xd7;ND+c)&#xd7;2&#xd7;&#x3c0;); is met for i) 6&#x2264;ND&#x3c;10 where a=&#x2212;0.0008, b=0.00705, c=0.1325, y=2; ii) 10&#x2264;ND&#x3c;12 where a=1.7924/(2&#xd7;&#x3c0;), b=0, c=0, y=&#x2212;0.408; or iii) 12&#x2264;ND&#x2264;20 where a=0.751/(2&#xd7;&#x3c0;), b=0, c=0, y=&#x2212;0.104; wherein Tis the maximum separation angle and ND is the amount of the nominal thread former diameter (Da) measured in millimeters.

Thread former and method for producing a thread

This invention relates to a screw tap which is rotatable about a rotational axis and has a number of thread-cutting teeth, which respectively have a radially outer tip cutter and are disposed mutually offset, with a predefined thread pitch, in an arrangement running spirally or helically around the rotational axis. In a lead region adjoining one end of the screw tap axially to the rotational axis, the maximum radial distance of the tip cutters of the thread-cutting teeth from the rotational axis increases with increasing axial distance of the tip cutters from one end of the screw tap according to a predefined radial distance function. At least some of the thread-cutting teeth in the lead region, at least in the region of the tip cutters, respectively have a defined cutter rounding between tool face and tool flank.

Screw tap and method for the production of a screw tap

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Weigendorf, Germany

Thomas Berschneider