Injection ram control

Details Injection ram control Injection ram control

B - Operations, Transporting

22

D

22/49

B22D 18/00 (2006.01) B22D 17/32 (2006.01)

Patent

CA 1129622

- 15 - ABSTRACT OF THE DISCLOSURE In a casting machine using an injection ram, the ram movements are measured accurately and reliably in spite of adverse ambient conditions by a special sensing arrange- ment located inside the hydraulic drive cylinder which drives the ram. A sonic energy pulse is generated in a waveguide near the hydraulic piston. This pulse propagates along the waveguide to a transducer at the cylinder wall. The time required for this pulse propagation corresponds to the posi- tion of the piston and hence of the injection ram.

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