COLD HOBBING INSTEAD OF SPARK EROSION

By replacing metal-cutting or erosion procedures with our cold hobbing process, we can significantly reduce your costs in the manufacture of dies.

The comparison of manufacturing costs between erosion machining and the cold hobbing process, only takes into consideration the inner mould of the dies for tools with 18, 48 and 96 cavities. In regard to the surface quality of the two processes, the surface No. 24 according to Charmilles Technologies VDI 3400 was selected in the erosion process. Even a tool with 18 cavities revealed a significant difference in costs.

A hob manufactured as a single piece is needed to form the internal mould of the die. This relatively expensive cost must then be calculated as an additional surcharge on the die. This supplementary cost for the hob, already pays for itself in a tool with 18 cavities. But a tool with 48 or even with 96 cavities pays back this extra cost numerous times over. Compared to the sinker EDM, a large number of dies can be pressed using cold hobbing.

The following production steps have been taken into account to establish the manufacture costs of both methods:

In addition to the cost savings and more efficient production time, all the dies have an improved surface quality and increased durability without any reworking (additional costs).