Grinders
Crankshaft machining with Junker and Zema
The two grinding machines Jucrank 6S 10-10 from Junker and Numerika G 1500 Plus from Zema deliver the best results in crankshaft machining as a machine line.
In this joint project, crankshafts with a length of 550 mm and a weight of 22 kg are ground. In the first step, the main and pin bearings are ground with CBN on the Jucrank 6S 10-10. The grinding process then moves on to the Numerika G 1500 Plus, where the flange and journals are machined with corundum.
For the first time, a table assembly from Junker is being integrated into the Numerika G series from Zema. This enables a clamping length of 1,200 mm, a center height of 170 mm as well as a rotation diameter of 280 mm and a workpiece weight of 150 kg. In addition, a double-end spindle and a B-axis are integrated into the Zema machine for crankshaft machining. This means that flanges and journals can be ground on this machine in just one clamping operation and not in two different operations and separate machines as was previously the case.
The use of the machine line not only reduces the acquisition costs, but also the space required. In addition, the concept offers maximum flexibility and cycle time. Flange and tenon can be ground with a profiled wheel in an angled plunge cut or with universal narrow wheels and multiple plunge cuts. The ideal solution for the customer's requirements, as they need both - maximum flexibility for small series and cycle time for the simulation of (pre-)series production.
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