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Screw method for forming a screw thread

一种螺钉、螺纹的技术，应用在螺钉领域，能够解决显示材料减弱等问题，达到小磨损的效果

Active Publication Date: 2013-01-02
HILTI AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although two material projections are squeezed together in a form-locking manner, a gap is thus left between them from the closed fold in some cases, showing a weakening of the material

Method used

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  • Screw method for forming a screw thread
  • Screw method for forming a screw thread
  • Screw method for forming a screw thread

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] exist figure 1 A device 10 is schematically shown in FIG. 2 for rolling the thread of a screw in a substantially cylindrical screw base body 12 . The device basically comprises two dies 14 , 16 which each have a roll surface 18 or 20 . The rolling surfaces 18 , 20 are aligned parallel to one another and each have a profile 22 or 24 . Here, the first die 14 is fixedly arranged, and the second die 16 can move linearly parallel to its rolling surface 20 along a rolling direction W and parallel to the first rolling surface 18 .

[0021] To form the thread, the base body 12 is positioned between the two dies 14 , 16 and the second die 16 is subsequently moved in the rolling direction W. Here, the base body 12 is rotated between the two dies 14 , 16 in a direction of rotation D, wherein a thread line is formed circumferentially in the base body 12 by a plurality of successive formations 22 , 24 . Each profile changes in height, geometry and position with increasing rolling...

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PUM

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Abstract

In the case of a screw having at least one thread (26) that is formed by a rolling process, especially a flat-die rolling process, whereby the thread (26) consists of two ridges of material (28a, 28b) which are shaped from a blank (12) by means of cold-forming during the rolling process in such a way that the thread has a closing crease (32) where the ridges of material (28a, 28b) meet each other, it is provided that the closing crease (32) is situated in the area of a flank (30a, 30b) of the thread (26).

Description

technical field [0001] The invention relates to a screw comprising at least one thread thread produced by a rolling process, in particular a flat thread rolling process, wherein the thread thread is formed from a base body by cold forming in the rolling process through two The formed material projections come together in such a way that the thread has a closed crease at which the material projections meet one above the other. The invention also relates to a method for producing a thread comprising at least one thread thread on the outer peripheral surface of an essentially cylindrical base body by rolling, in particular flatten rolling. [0002] The invention particularly relates to self-tapping screws. Background technique [0003] For producing threads on screws, so-called flat-thread rolling methods are known. In this method, an essentially cylindrical base body to be processed is positioned between two formed dies and subsequently moved linearly relative to each other....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B25/06B21H3/06
CPCB21H3/06F16B25/0026F16B25/0047
Inventor F·罗森克兰茨C·阿奇莱特纳
Owner HILTI AG