Specimen grinding / finishing machine

The fundamental requirement to receive correct results of sheet metal tensile testing is the specimen itself – correct dimensions, finished surface at the edges and correct preparation in general without influencing if mechanical properties of the tensile specimen.

Punching / blanking is the most effective and economical method of sample production if there is the possibility  to remove in fast and effective way the work-hardened zone / damage of edge of the specimen. The sheet metal tensile specimen PSM 2000 (well known since 1970) was re-designed to meet this requirement in a perfect and fast way. The use of the machine is as easy so also an unskilled worker is able to prepare high quality specimens after several minutes of training. The specimens will receive perfect parallelism in gage length (within parallelism of 0.02 mm). The grinding process takes less than 2 or 3 minutes (depending on the kind of specimens). The quality meets and accede the requirements of all testing norms and IDDRG international deep drawing research group.

The machine is under continuous improvement process and actually we are building the fifth generation. At this the grinding belt will receive the tension by a pneumatic system. This increases the comfort and also the reliability of parallelism of grinding.

PSM2000 the synonym for highest quality in sheet metal tensile specimen preparation

Suitable for blanked specimens and also specimen cut be laser, water jet, milling and others…

The machine is contents an industrial level of quality with a grinding belt of 2000 mm length. The grinding speed of the belt meets the required speed for grinding process on metal (30 m per second) and has an big surface of the grinding consumables (surface 2’000 mm in length x 100 mm in width = 200.000 mm²). For special requirements we are able to deliver special grinding belt with cooling function ore for special materials like titanium, stainless steel, carbon steel and more. Some of our customers are using also aluminium oxyd grinding paper to use this machine also for specimen grinding for spectral analyses (not to contaminate the metal with carbon from SiC-paper).

sheet metal tensile specimen is positioned (for demonstration) on the grinding belt. The grinding belt respectively the grinding head with pulley rollers are shaped like the tensile specimen (including the radius). Within on two minutes (including specimen loading) the damaged / cold hardened zone from punching will be removed by finishing with grinding paper. All influencing deformations and failure of specimen (like cold hardened zone from blanking, micro cracks, material compression, material deforming) will be removed completely.

These abrasive technology generates no heat. Because of the low temperatures (up to about 60 degrees C) the material characteristics are not influenced. To change the mechanical properties of the specimens a temperature of >120 degrees are required – fare away what grinding process will bring up.

For different specimen shapes different grinding heads (with different distances of pulley rollers) and different specimen holders are available. The exchange of this heads is possible in less than 2 minutes. Because of very special design now we are able to support also specimens with Lc of only 36 mm/ L0 of 30 mm (at radius 15 mm) can be finished.

Typical specimens shapes: A80 / A50 / ASTM A370 / JIS / A30