Specimen stamping presses are used to produce the most commonly implemented specimen shapes (shoulder specimen to DIN EN 10002, JIS Z 2201, ASTM E8, etc.) up to a thickness range of 8mm. The final shape of the specimen is stamped slightly over dimensioned (strain-hardening zone) and can then be simply and quickly ground down to size. The slow cutting speed and the optimized configuration of the die reduce the size of the strain-hardened zone to less than 10% of the specimen thickness.
The specimen grinding machine must not only remove this hardened zone, it must also guarantee the shape tolerances (parallelism in the test dimension) stipulated by the standards. | |
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