3 Fundamentals of press design

122 Fundamentals of press design
However, the casting technician can only alloy and cool within restricted
limits, as elongation drops with increasing hardness. Due to this type
of metallurgical-technological operation, and because of their geometrical
shape, castings such as eccentric wheels are inevitably exposed to
high degrees of residual stress. As a result, stress relief annealing at 560 to
580 °C is an absolute necessity.
In the foundry, quality standards must be assured in order to avert the
risk of cracks and fractures in the castings. The marked tendency of the
material to form scale substantially impedes the production of components
made of GGG-70. The porosity risk therefore is addressed by feeding
and selective solidification. All components, naturally including also
large parts for press drive systems, are subject to highly stringent quality
controls, including ultrasound, X-ray, crack detection and hardness testing,
as well as testing of mechanical values using test-bar specimen, cast
together with produced component.
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