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Efficient corundum grinding of large workpieces

The new NUMERIKA GH 3500 2W corundum grinding machine from the JUNKER Group simultaneously grinds large workpieces (such as axle beams, rotors or shafts) with two wheel heads. This set-up reduces cycle times by more than half, making this sturdy, low-maintenance machine an excellent choice for producing high quantities.

With the NUMERIKA series from ZEMA, the JUNKER Group offers economical and reliable cylindrical grinding machines with corundum. This range now extends to include the NUMERIKA GH 3500 2W, a machine with two wheel heads each with their own cross slide. In comparison to the one-wheelhead machine, in which the workpiece is turned and ground manually using two clamping operations, simultaneous grinding of the workpiece reduces the total cycle time by more than half. The ability to carry out the complete grinding process in a single clamping set-up also raises quality. These features combined with a high level of automation are ideal for users who mainly machine high quantities of large workpieces.

Powerful XL machine

The new NUMERIKA grinds workpieces up to 350 kilograms, or even up to 1000 kg on the optional KARGO platform. The largest version has a clamping length of up to 3000 millimeters, a two-sided grinding length of 780 millimeters and a peripheral diameter of up to 650 millimeters. The large grinding wheel sets with a maximum diameter of up to 915 millimeters and correspondingly longer service life result in longer tool lives.

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Compact design

Despite its power, the NUMERIKA GH 3500 2W impresses with its deliberately compact design, which also ensures the possibility of loading the machine from above in facilities with ceilings less than five meters high. On request, the JUNKER Group can also equip the machine with fully automatic loading and unloading systems to ensure smooth production.

 

 

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Low maintenance thanks to hydrostatic technology

The NUMERIKA is extremely low maintenance thanks to the proven ZEMA hydrostatic technology. Both the workpiece and wheel head spindles are mounted on hydrostatic bearings, and the X and Z-axes of the cross slide rests are hydrostatic as well. A fine layer of oil enables virtually perfect spindle rotation with constant shaft centering and uniform, jolt-free and precise movement of the cross slide rest.

The lack of metal-to-metal contact during this process requires less energy for the drive and reduce wear. At the same time, the hydraulic medium provides permanent cooling and acts as an excellent vibration damper.

Easy handling and operation

Each of the two work heads are driven with the same power. This feature increases the torque transmission and quickly brings heavy workpieces to high speeds. In addition, supporting steadies balance longer workpieces, ensuring faster grinding with better quality.

With the NUMERIKA GH 3500 2W, ZEMA meets the highest quality and efficient production requirements. The torsionally rigid machine bed also helps to deliver perfect grinding results. The machine is also quite easy to use: the user-friendly control system offers all required input screens for precise grinding and outstanding surface quality.

A ZEMA machine with JUNKER services

As part of the JUNKER Group, ZEMA has JUNKER’s global sales and service network at its disposal, which has impressed discerning manufacturers for years. Expert service technicians look after every machine, and, if necessary, provide immediate assistance around the world, 24/7.

 

 

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