Plastic and nonmetallic article shaping or treating: processes – Treating shaped or solid article – By a temperature change
Patent
1998-07-13
2000-05-02
Fiorilla, Christopher A.
Plastic and nonmetallic article shaping or treating: processes
Treating shaped or solid article
By a temperature change
264348, B29B 1700
Patent
active
060569115
ABSTRACT:
A method of thermally treating a preform element, of the kind having a facing table of polycrystalline diamond bonded to a substrate of cemented tungsten carbide, is disclosed. The steps of the method are: (a) heating the element to a soaking temperature of about 600.degree. C., (b) maintaining the temperature of the element at that temperature for two to three hours, and (c) cooling the element to ambient temperature. These steps are preferably then followed by a flash heating cycle. These steps are: (d) heating the element to a temperature in the range of 750-850.degree. C., (e) maintaining the temperature of the element at that temperature for about four seconds, and (f) cooling the element to ambient temperature. This thermal treatment relieves residual stresses in the element in order to reduce the risk of cracking or delamination of the element in use.
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patent: 5523121 (1996-06-01), Anthony et al.
patent: 5614140 (1997-03-01), Pinneo
patent: 5626909 (1997-05-01), Iacovangelo
Camco International (UK) Limited
Daly Jeffery E.
Fiorilla Christopher A.
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