Tool Heat Shrink Technology: Your Advantages
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FAQ
Frequently asked questions
What temperature is the tool holder heated to during the shrinking process?
This depends on the geometry of the holder, the size of the clamping diameter and the taper size. While some standard holders have 4.5 degrees, slim holders have 3 degrees. Depending on the type, a different temperature from 150˚C to 350˚C is used when shrinking the holder.
What types of cutting materials can be used in shrink-fit holders for the shrink-fit process?
Steel, HSS, carbide, heavy metals, metal powder, shrink-fit extensions.
What is the required tolerance for the shank diameter of the cutting tool when using a shrink-fit tool holder?
The shank tolerance of the cutting tool must be h6 or h5.
Is it possible to monitor the service life of the tool holder and the number of shrink cycles of the tool holder?
With the ZOLLER »powerShrink« it is possible to monitor the heating cycles of the tool holder using a unique tool holder ID number, e.g. the ZOLLER »idChip« technology. Each cycle is monitored and registered in the »pilot« software.
What is the minimum and maximum heating time?
The heating time depends on the geometry of the tool holder and the clamping diameter. For small diameters, this takes 2 to 3 seconds, for large diameters 5 to 7 seconds.
What is the minimum and maximum cooling time?
ZOLLER offers two types of cooling systems: A non-contact cooling system with air cooling and cooling adapters. Depending on the tool diameter, the cooling time with cooling adapters is 60 to 120 seconds. With »zStream« air cooling, the process is called conditioning, in which the entire tool holder is cooled from the nose to the flange. The conditioning time here depends on the diameter of the holder and is 3 to 5 minutes.
Is an air-conditioned room required to install the »powerShrink« device?
An air-conditioned room is not required. The device can be installed in a dust-free area in the machine hall.
How does shrinking work and what kind of process takes place here?
The concept is simple. Each shrink tool holder is manufactured with an internal diameter that is slightly smaller than the shank diameter of the cutting tool. Using an induction device, the nose area of the tool holder is quickly heated to increase the internal diameter. At this point, the cutting tool can be inserted into the tool holder. The tool holder is then cooled and the diameter shrinks, exerting a force on the shank of the cutting tool to hold it precisely in position.
What is non-contact cooling and contact cooling?
When tool holders are shrunk without direct contact, the tool holder system is called non-contact cooling. This is done, for example, with the help of cooling adapters or air cooling.
If the tool holders are cooled with a liquid after heating, this process is called quenching. The service life of the holder is reduced and the holder rusts if the tool holder continues to be used with liquids directly on it. The cooling liquid becomes dirty after a short time and must be replaced, otherwise it collapses, smells strongly and contains harmful ingredients that are dangerous to human skin.
Is it possible to use the same shrink-fit machine for standard diameters from 3 to 32 mm and heavy-duty shrink-fit holders for diameters over 32 mm?
Yes, this is possible with the ZOLLER »powerShrink 600«, where the 14 kVA induction coil and the 22 kVA induction coil can be exchanged quickly and easily via the quick-change interface.
Is it possible to adjust the overall length of the tool after shrinking with the »powerShrink« machine?
Yes, with the »eQset« and »liteSet« adjustment systems it is possible to preset the overall length of the tool on the »powerShrink«.
