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Cylindrical Grinding Machine for Rotor Shaft Manufacturing

JUNKER offers the JUMAT 6L, an improved solution for rotor shaft manufacturing. JUNKER simplified the processes and developed a flexible grinding machine concept that provides increased quality with in-process measuring of all critical dimensions, including form scanning and automatic shape correction.

Sullair LLC (Michigan City, IN), a JUNKER customer since 2011, recently changed its finishing process. In the past, the process required multiple grinding machine set-ups to finish a shaft. Diameters and faces of the shaft were ground on the JUNKER QUICKPOINT prior to grinding the compressor flutes on form grinding machines.

Now with the JUMAT 6L, all of this is done in one set-up and on one machine. For faster changeovers and greater control over process quality, the in-process measuring systems measures key features and automatically adjusts the process to produce the highest quality without operator intervention. JUNKER developed the capability to measure the complex compressor flute profile and correct the dressing path to dress the CBN wheels complete automatically.

"The correction is essential since tool pressure varies depending on the contact zone of the shape," said a company spokesperson. "It is necessary to apply a wheel with an incorrect shape to make a perfect part. The JUNKER grinding machine masters this with ease. For optimum accuracy, the machine produces parts with a total lead variation of +/- 3 microns and a profile accuracy of less than 6 microns."

For the different flute shapes and for rough and finish grinding, the machine is equipped with a wheel changer. The machine programs call up the correct wheels and manage their life span. If a wheel has reached the end of its life, the controller requests a new wheel and alerts the production manager to purchase a new one. The parts are presented to the machine on a conveyor with an autonomy of a full shift. Parts are loaded into the machine by an internal gantry system.

For more information contact:

Erwin Junker Machinery, Inc.

2541 Technology Drive, #410

Elgin, IL 60124


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