Hydraulic Clamping Tools

Gear Grinding

Hydraulic clamping mandrels for bore parts
The opposite drawing illustrates a clamping mandrel for clamping multiple gears during gear grinding. The gears are first aligned outside the machine in a pre-alignment station and clamped on the mandrel. Clamping pressure is initiated radially by hand or via an electrical or pneumatic screwing device. Subsequently, the prepared Königdorn® mandrel is placed into the gear grinding machine. A taper
mount in the tool spindle will ensure
the required run-out accuracy of
0.003 mm.


The opposite drawing illustrates a clamping mandrel for automatic workpiece loading within the machine. The Königdorn® mandrel is mounted firmly on the tool spindle and the clamping pressure is initiated via machine hydraulics. The mandrel itself has a built-in pressure transducer which generates appropriate clamping for the clamping diameter in question. A handling system places the workpiece on an eccentric lead-in situated in front of the clamping surface. The loading onto the clamping surface takes place through a sliding sleeve located on the tailstock.

An integrated operation indicator increases the operating safety, as it allows the operator to check the state of operation and the mandrel condition.

Hydraulic clamping chucks
for shaft parts
With geared shaft parts the bearing seat is frequently used as a clamping location (opposite drawing). The workpieces are manually placed on a study rest. The workpiece is loaded via a headstock sleeve and the tailstock center. The clamping force is generated via axially initiated hydraulic pressure. A pressure transducer in the chuck guarantees the necessary clamping pressure.

A frequent application during gear grinding is the mandrel-chuck clamping alternative. The hydraulic clamping mandrel, which has been prepared and clamped with the workpiece outside the machine, is placed on prisms in the machine and loaded between centers (opposite drawing). Clamping pressure is initiated via machine hydraulics.

A special application is the clamping of a pinion with two shaft stubs which are simultaneously used as bearing seats (opposite drawing). Two independent clamping cycles are manually actuated. The entire mandrel with workpiece will then again be clamped in the chuck of the machine.

Hydraulic clamping mandrels
for workpieces with geared
and smooth bore

Königdorn® mandrel with two clamping locations and externally geared clamping bushing for the mounting of workpieces to be ground as a helical gear (opposite drawing).

Through both clamping locations optimal centering is achieved on the entire workpiece length. Mounting between center and collet chuck, initiation of clamping force is radial by hand. Run-out accuracy: 0.005 mm.

Hydraulic clamping mandrel, mounted on a quick change chuck with integrated pressure transducer (opposite drawing). Centering of the clamping mandrel takes place via a clamping bushing in the base adaptor.

Clamping pressure is initiated radially by hand. The clamping mandrel is clamped via machine hydraulics.

Various workpiece diameters can be clamped on the mandrel via slotted intermediate bushings. Run-out accuracy: 0.003 mm.

Workpiece and diamond dressing
wheel clamping on one Königdorn®

Workpiece and diamond dressing wheel clamping on one Königdorn® device. With this combination Königdorn® mandrel and chuck, a hollow shank shaft and the diamond dressing wheel are simultaneously clamped. If desired, the mandrel can be braced via a tailstock center. A special mounting taper makes a run-out of 0.003 mm possible.

Hydraulic Königdorn® device for mounting workpiece, workpiece stop, and diamond dressing wheel. Dressing wheel and workpiece stop are clamped manually. Workpiece clamping takes place via the piston rod of the machine hydraulics. An additional mechanical clamping pressure control increases the operational safety of this clamping system.
Run-out accuracy: 0.003 mm.