Product category:
Mechanical fasteners, fixing and joining, and equipment
News Release from: Arnold Umformtechnik | Subject: Strux screws - captive fasteners
Edited by the Manufacturingtalk Editorial
Team on 20 February 2004
Captive fasteners can replace welding
screws
Captive fasteners, which are pressed into formed sheet metal parts, provide a sheet metal component ready for installation and are a very reliable alternative to conventional welding screws.
Arnold Strux screws are captive fasteners which are pressed into formed sheet metal parts providing a sheet metal component ready for installation Therefore, Arnold Strux is a very reliable alternative to conventional welding screws, riveted or pressed-in bolts
This article was originally published on Manufacturingtalk on 20 Feb 2004 at 8.00am (UK)
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High ejection forces and high torsion moments are typical for pressed-in Arnold Strux screws.
Function mode - Arnold-Strux is fed through the prepunched sheets into the die-plate (platen) positioned below it.
During the the press-in process the press-in screw is first centred by the calibration collar.
With continued axial movement of the Strux screw the hole in the sheet is widened by the calibration collar.
With continued progress the Torx locking feature is pressed into the sheet.
This involves a displacement of the material into the annular groove.
High load-carrying capacity of connection The sheet material displaced into the annular groove in combination with the special contour of the calibration collar on the annular groove side produces very high ejection strength.
From this a very high resistance results against axial loading (e.g impact on the screw end during assembly).
During the pressing-in process there is also metal pressed into the free spaces of the Torx locking feature.
This ensures the very high resistance against rotation of the Arnold Strux screw.
Normally, this resistance against rotation depends only on the shear strength and thickness of the metal sheet.
Arnold-Strux an economical alternative * Normal presses can be used * Fully automatic work flow possible by using suitable feeding system * High productivity possible by simultaneous presing of several Strux screws and short cycle times * Arnold Strux can be made also with self-locking Powerlok theard In recent years Arnold Umformtechnik from Germany has become the development partner for joining technology.
The company's motto is "Solutions which connect".
Well-known car manufacturers and electrical industries are among our partners.
At present, over 400 employees produce more than 13 million fastening elements every day.
Arnold is a member of the Wuerth Group.
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