Table of contents
3QLCLM
Edition: 04/2014
18
4.3 Function of the power chuck
4.3.1
General information:
The power chuck is actuated through a standard hydraulic cylinder with monitoring of chucking stroke, by
using machine hydraulics or a separately provides hydraulic unit.
Depending on the type of work pieces to be machined, the following are used:
Partly open chuck
a hydraulic actuating cylinder
e.g. Type
OKRJ
...
or
Open chuck
a hydraulic hollow cylinder
e.g. Type
OKHJ
...
.
In some cases, hydraulic cylinder of
type PZRAJ or PZHAMJ is used.
The power chuck, fixed to the spindle head of a lathe, is actuated axially through a hydraulic clamping
cylinder and has the function to generate a gripping force to hold the work piece to be clamped through
the axial force generated by the clamping cylinder.
The pressure at the clamping cylinder must be adjusted such that the max.
permissible actuation force of the power chuck is not exceeded.
The axial actuation force of the clamping cylinder, which is spread on the actuator surface through
pressure, is transferred to the corresponding wedge guides of the master jaw through the wedge surfaces
laid out in the chuck actuator and these wedge guides wedge into each other during the clamping process.
The corresponding gripping force builds up radially on the work piece through the top jaws.
Clamping force at the chuck actuator causes jaw stroke to the inside (outside clamping). Compressive
force at the chuck actuator causes jaw stroke to the outside (inside clamping of hollow work pieces). The
power chuck type 3QLCLM is equally suitable for both clamping devices.
The monitoring of the clamping path is done through radially arranged limit switch on the clamping
cylinder.
Partly open chuck
Open chuck