Method and apparatus for evaluating the hardening of chemically

Details Method and apparatus for evaluating the hardening of chemically Method and apparatus for evaluating the hardening of chemically

1988-09-08

1989-12-26

Noland, Tom

Measuring and testing

Hardness

By penetrator or indentor

G01N 348

Patent

active

048889822

ABSTRACT:
To ascertain when individual foundry molds and cores, bonded by a chemical method, have reached the requisition hardness, or still have the requisite hardness, a probe is pushed into the mold or core with a predetermined force, then withdrawn, and after a time interval it is pushed into a fresh point on the mold or core. This is repeated a number of times, each time in a different place, until the penetration is less than a predetermined value, indicating that the requisite hardness has been reached. Apparatus for doing this automatically can be portable and may signal by lamp and/or sound when the hardness has reached the required value. It may be modified to check whether the hardness of a core or mold made some time earlier has fallen below a given minimum value.

REFERENCES:
patent: 2509692 (1950-05-01), Miller
patent: 4059990 (1977-11-01), Glover et al.
patent: 4331026 (1982-05-01), Howard et al.

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