Turning Shrink-Fit on its Side

Haimer has developed a new oriented shrink-fit machine to speed and simplify cutter changes.

Article From: 9/13/2012 Modern Machine Shop, ,

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Haimer’s horizontally oriented shrink-fit machine is designed to simplify tool changes for small HSK toolholders used for micromachining.

Toolholders with HSK interfaces are said to be the best option for micromachining applications. That’s primarily because the toolholder’s hollow-shank design enables its taper to maintain full contact with the spindle as the spindle expands, while a consistent Z-axis tool length is maintained via the face contact provided by the toolholder. Haimer, located in Booth W-1464, has developed a new oriented shrink-fit machine to speed and simplify cutter changes using these toolholders. Unlike most, however, this device is horizontally oriented.

 

The Power Clamp Nano shrink-fit machine supports solid carbide and HSS tools in diameters ranging from 3 to 16 mm. Horizontal orientation is a distinguishing design element of this compact new shrink-fit machine. The company found that it is easier to insert and remove small-diameter tools horizontally rather than vertically, because it can be difficult to access tiny tools using vertical shrink-fit machines.

 

The heating coil used in the Power Clamp Nano was developed specifically for micro-shrink-fit toolholders, too, with their characteristic slim profiles and small nose diameters. With typical inductive coils, there is a considerable distance from the inside of the coil to the outside nose diameter of a small toolholder. Consequently, efficiently opening the bore of the toolholder without damaging it by overheating requires accessories. In addition, conventional inductive coils aren’t well-suited for use with non-magnetic, stainless steel toolholders. However, the Power Clamp Nano’s appropriately sized 13-kW coil can effectively heat standard small toolholders as well as stainless steel versions without the need for additional accessories and without damaging the toolholders. Complete heating takes 2 seconds, while the machine’s air-cooling unit cools the toolholder in less than 1 minute, the company says.

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