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The fact that we have our own annealing furnace is very beneficial. We are able to control the increase and decrease of temperature during the annealing process; residual stresses are thus reduced. During the under cooling process casting stress can lead to problems which may ultimately beget distortion in the casting. Our precise control of this process allows us to circumvent potential distortions.
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| Casting stresses can be categorized according to their cause: thermal load, stress variance, and contraction stress. |
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(1) Thermal Load.
Issues with thermal load result in an unevenness of the casting wall. The unevenness means that various parts coll at differing rates resulting in a non-uniform casting. The ideal prevention method of thermal load stress requires a minimization of temperature differences along the casting.
(2) Stress Variance
Individual locations along the casting may receive stresses at erratic times which leads to an overall irregularity.
(3) Contraction Stress
Contraction stress, also known as mechanical stress, is stress related to a mechanical hindrance. Contraction stress typically is temporary as the stress will dissipate on its own. Because casting strength is lower at high temperatures, it is possible for the stress level to surpass the strength of the casting eventually leading to a crack.
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