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.
Integrated measurement
Pre and finish grinding can be performed in a single clamping set-up as well as measurement in a grinding-measurement cycle.
- Diameter
- Circularity (automatic circularity correction and sector circularity)
- Element width
- Taper
- Runout
- Concentric running measuring
- Throw
- Angle
The measured data is stored in the machine and can then be evaluated as required.
Extremely quiet running
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.
Logging the measuring data
Automatic logging and archiving of all process data ensures seamless tracking of the technology.
Complete machining of main and pin bearings as well as flanges and journals in a single camping set-up
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:
- Main and pin bearings (cylindrical, concave, convex)
- Thrust bearings
- Flanges
- Journals
- Plane surfaces
- Radii
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.
Bearing parallelism and ball shape can be varied thanks to adjusting axis
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.
