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Saarstahl, a producer of rods and semi-finished parts for the automotive, construction, energy, aerospace and mechanical-engineering industries, has purchased a VSC 400DS turn/grind centre from EMAG.

The machine is being used to combine turn/grind machining of carbide roll rings and carry out measuring operations.

By means of an integrated measuring system, the workpieces are measured between manufacturing steps and the tools checked indirectly.

The diameter on the carbide ring is collected with a probe system, compared with the target data and then turned to the correct diameter.

If the diameter is finished, the calibre position and depth are measured, then re-measured after pre-turning, turned to size and then the dimensions should be accurate.

The carbide ring has two calibres and can be mounted on both sides.

Each front side must be the same distance to the centre line of the calibre, otherwise there will be an offset.

The calibres of the carbide rings work with wires of 8.5-25mm with a tolerance of +/-0.15mm.

To collect the precise position of the calibres, trigger contacts must be carried out on the complex geometries.

The staff defined a correction value for each calibre, incorporated it into the measurement and checked the values offline at the measuring station.

A design engineer from EMAG suggested Blum-Novotest’s TC76 probe system.

The system was developed to measure workpieces and tools in turning and grinding machines.

Uwe Fischer, sales engineer at Blum-Novotest, said: ’Inside the TC76 is the Shark 360 measuring mechanism with a face gear – this guarantees precise trigger contacts and forces in all directions.

’The probe has precise non-lobing touch characteristics, even for measurements with torsion forces on the mechanism.’ Another advantage is the no-wear trigger-signal generation of the Blum probe.

The TC76 generates an optoelectronic signal by shading a miniature light barrier on the inside of the probe and not according to the tripod principle.

Since being integrated into the turn-grinding centre, the Blum probe system takes reliable measurements.

The values are repeatable and random checks of the carbide rings are performed.

The considerably higher measuring speed with the Blum probe reduced the measuring process time by 40 per cent.

The probe checks the tools indirectly via workpiece measurement, so that the manual intermediate measurements are now automated.

With the previous machining centre, the carbide ring had to be taken from the machine and measured offline, reset and re-machined.

With the new EMAG machine, the complete ring can be turned in one setting.

If a cutting plate has wear and the probe displays that the tolerance is exceeded, the turn-grinding machine compensates this wear automatically and turns to the correct size.

Measurement is carried out before the final cut and the tool is corrected correspondingly.

Blum-Novotest GmbH is recognized as a developer of leading-edge measurement and testing technology, with some 40 years of experience as partner for the worldwide machine tool, automotive and aircraft industries.

The business develops and produces tactile and optical measuring systems for workpiece measurement and tool setting applications in machine tools. Alongside this, Blum develops and manufactures production line integrated measuring and testing solutions.

In addition to the modern, fast growing manufacturing sites near Ravensburg (Germany, BW) and Willich (Germany, NRW) Blum has sales & service subsidiaries in Bordeaux, Como, Birmingham, Cincinnati, Los Angeles, Japan, Taiwan, Korea, Singapore and Shanghai.

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