In Hexalobular dies, also called Torx-type dies, we have sometimes found tool designs where the material could not completely fill the calibrating zone down to the desired depth and, consequently, some remained out of it.
When the reduction percentage of the wire in the calibrating zone is equal or higher than 30%, then the wire has a natural tendency to expand itself lengthswise just like a cork in a bottle, meaning that it tends to spring out.
As it is seen in the drawing, this problem can occur when the reduction in the die is not guided. Therefore, if we add a small guide of about 1 mm depth before the hexalobular reduction, the material will not expand lengthwise and thanks to the crosswise pressure, we will force it to enter into the calibrating zone down to the desired depth.
For this kind of dies, having a reduction and an hexalobular profile, TEMSA recommends the TEM4F quality, as this is the carbide quality having the best combination of resilience and hardness required for this application.