With the innovative JUCRANK 8 Platform from JUNKER, even very large workpieces with a length of up to 4.8 meters and a peripheral diameter of 470 mm can be machined with ease. Thanks to CBN technology and synchronous grinding spindles, crankshafts can be ground in record time, to a perfect standard of surface quality and with maximum flexibility – machining can already be carried out on just one crankshaft.
Whether it is generator construction, ship building, railway transport, or construction machines – when it comes to machining of large crankshafts, axles or drive shafts, it is all about maximum precision and top quality. With the new Platform 8, JUNKER has provided the ideal prerequisites for JUCRANK-type grinding ma-chines to achieve excellent results, even on oversized workpieces with a maximum weight of 1,000 kg.
Pre and finish grinding can be performed in a single clamping set-up as well as measurement in a grinding-measurement cycle.
The measured data is stored in the machine and can then be evaluated as required.
Thanks to the synchronized C-axes which are directly driven via torque motors, the JUCRANK 8 Platform offers impressively high precision and optimum torque rigidity. At the same time, the directly driven grinding spindles with structure-borne sound sensor and dynamic balancing system ensure extremely quiet running.
Automatic logging and archiving of all process data ensures seamless tracking of the technology.
Flanges and journals can now be ground in a single clamping set-up, as well as main and pin bearings. Thus, the following can be machined on crankshafts using the JUCRANK oscillation grinding machines:
Through the use of two synchronous grinding spindles with narrow CBN grinding wheels, both main and pin bearings can be machined in a single clamping set-up – despite differences in width and different workpiece radii. The JUCRANK 8 series comes in three versions: 8S, 8L, and 8XL. All of which impress with maximum flexibility, the ultimate in productivity and top quality.
Thanks to an adjusting axis, the oscillation grinding method is even more flexible: It swivels the grinding spindle in the micron range during grinding. In this way, the main and pin bearing can be given their own profile shape. Taper correction of bearing positions also helps ensure individually improved production quality. What is more, a defined crowning on the bearing positions can be created with interpolation using the aid of a narrow grinding wheel.
Flanges and journals can now be ground in a single clamping set-up, as well as main and pin bearings.
The JUCRANK takes care of all grinding operations on crankshafts in a single clamping set-up.
It swivels the grinding spindle in the micron range during grinding. In this way, the main and pin bearing can be given their own profile shape.