ARBURG - Lossburg
m&h Case Study ARBURG - Lossburg

Probing deep inside

Previously, contours deep inside workpieces could only be measured with special gauges. The modular 20.41 probe from m&h enables precision measuring to microns at almost any depth. ARBURG highly appreciate the production reliability brought by this probe.

For over 50 years, ARBURG has been a renowned name with a particularly good reputation amongst injection moulding machine manufacturers. About 1,700 employees working in Loßburg in the Black Forest, near Freudenstadt, are responsible for the company’s economic success in the global market. At this location, they manufacture using state-of-the-art machinery and a great deal of in-house know-how.

Fitting accuracy and best possible surfaces are the main criteria workpieces at ARBURG must meet. This is why many hydraulic cylinders and guideways are roller-burnished after bores have been machined. Large pressure cylinders have bores up to 500mm diameter to a depth up to 1,000mm. This is a huge amount of work for the tool producing the bore. Often the indexable insert chips before it reaches the bottom of the bore so the diameter is not completely bored to the correct dimensions. This then creates dangers for the expensive tool following it. For this reason, they check whether the bore is actually completely finished to nominal size after each boring operation. “Our working sequence comprises rough machining, finishing, measuring and roller-burnishing”, reports Stefan Seeger, the group leader responsible for the machining centres at ARBURG. This takes a few minutes. However, it saves expensive tools, prevents rejects and ensures a reliable production process.

The modular m&h 20.41 touch probe has a screwed-in micro probe in its body instead of the usual measuring mechanism. This can be removed allowing extensions to be attached in any combination. The micro measuring mechanism is then screwed into the end of these extensions. This way measuring rods of almost any length can be generated, ARBURG use a length of 500mm.

Through calibration at the beginning of batch manufacture, the required accuracy to maintain and measure a boring tolerance of only 10μm deep inside a bore is easily achieved. Because of the close tolerances of their workpieces, ARBURG also compensate after changing the rotational direction of the spindle.

The standard extensions of the m&h 20.41 touch probe have an outside diameter of only 25mm and are made of stainless steel. They are available with lengths of 30, 50, 100 and 200mm. In addition...

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m&h Inprocess Messtechnik GmbH
Am Langholz 11
DE-88289 Waldburg
Germany

Phone: +49 7529 9733-0
Fax:     +49 7529 9733-7

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