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How to select: Selecting the Right Tool is Key to Tool Performance
The single stress ring followed by the double stress ring is today the most commonly used prestressing tool system. However, in many cases these simple prestressing tools would not be sufficient to give the required die support in terms of compressive stress and stiffness. The overall tool performance, including better service life of the die insert and the prestressing tool itself, would usually benefit significantly from an optimized tool design including the selection of prestressing system and level of interference fit. The figure below provides an overview table of different prestressing tool systems and can serve a guideline for the selection of tool system. Advanced tool systems as STRECON® Vari-Fit and STRECON® Dyna-Fit are offered as separated solutions. |
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Pre-stressing of the Die Insert
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Winding Core of Steel
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Winding Core of Tungsten Carbide
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Radial pre-stressing
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The die is prestressed in radial direction by means of compressive stress distribution on the outer diameter of the die (i.e. reduced tangential stresses in the die). The system is designed for longitudinal die and ring cracks.
Tool systems available:
STRECON® Basic Container, single ring, double ring
STRECON® LEAN Container (available now for individual design and order at www.strecon.com/online ordering)
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In addition to radial prestressing, the tool system has a higher stiffness due to the carbide inner ring/winding core. The stiffness reduces the stress-strain behaviour of the die, resulting also in less die deflection during process load. (approx. 30%). The system is designed for longitudinal die cracks, dies with complex geometry and sharp corners, and for high precision applications.
Tool systems available:
STRECON® E+ Container
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Radial and axial pre-stressing
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In addition to the radial prestressing, the die is prestressed in axial direction. The 2-directional die support is ensured during tool assembly. The system is designed for transverse and horizontal die cracking, and split-die tool designs.
Tool systems available:
STRECON® Axi-Fit Container. Single ring and double ring system with axial pre-stressing feature
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In addition to radial and axial prestressing, the tool system has a higher stiffness that reduces the stress-strain behaviour of the die, resulting also in less die deflection during process load. The system is designed for complex die geometry and tool designs suffering from transverse and horizontal die cracking, split-die tool designs, and for high precision applications.
Tool systems available:
STRECON® E+ Axi-Fit Container
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