YMT Limited Toolholding that’s fit for purpose
UK – More than a decade ago, Diebold introduced the ﬁrst contact-shrink unit. That was a milestone in modern shrink-fit technology and the company built on the lessons learned to develop inductive shrink units, chiller units, and integrated tool-settings systems.
It is easy to think of shrink-fit technology as a relatively new technique. However, open-flame heating has been used to shrink-fit parts together since before the industrial revolution. The ﬁrst documented application was to heat and then shrink iron rims onto wagon wheels.
This method was then applied to smaller items, such as heating rings or bearings onto shafts. Eventually, open-flame units were developed to heat shrink-fit chucks using carbide tooling. These systems, as well as the ubiquitous oxy-acetylene torch, remain in use in some workshops to this day.
Hot-air shrink units replace open-flame designs
For safety reasons, hot-air shrink units were offered as an alternative to the open-flame designs. The main drawback of hot air was the time required to heat a chuck sufficiently to change a cutting tool. It offered the opportunity to automate the process to some degree, but this didn’t compensate of the long cycle time.
In 1992, Tooling Innovations in California obtained a US patent for shrink-fit tooling, and for an inductive shrinking unit. The machine that was introduced was very powerful, but also very large. That unit developed high power in a relatively undeﬁned area, which resulted in overheating of the cutting tools.