Tag Archive for Wire EDM

TEMSA purchases a new CMM Mitutyo Crysta Apex S

TEMSA has purchased a new coordinate-measuring machine Mitutoyo Crysta Apex S to be used exclusively by the erosion and HSC departments. This new acquisition is aimed to improve the pre-setting of the tools to be processed there, since EDM, Wire EDM and HSC are the most important among the manufacturing processes in TEMSA.

The increasing relevance of TEMSA in the powder metallurgical market and the rising complexity of the tools for cold forming makes necessary to apply thorough controls even between intermediate processes. Thus, together with our EROWA system high reliable and standardized measurements will be performed in a very fast and agile way.

The Mitutyo Crysta Apex S is a high precision device (in the range of 1.7µm) and is able to correct temperature variations between 16° and 26°. In addition to point-to-point measurement, the MPP-310Q and Mitutoyo Laser probes provide a contact/non-contact scanning function.

This device, together with the last acquisitions accomplished during the last 2 years have completely renovated the most important department in TEMSA – Erosions and HSC – in each of its machines. This prepares TEMSA to respond with high flexibility and quality to the most challenging markets and clients.

CMM Mitutyo Crysta Apex S

Hexalobular dies with reduction problems

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.

Reduction in a Hexalobular die TEMSA

Reduction in a Hexalobular die TEMSA