C - Chemistry – Metallurgy – 22 – F
Patent
C - Chemistry, Metallurgy
22
F
148/10
C22F 1/08 (2006.01)
Patent
CA 1176959
ABSTRACT OF THE DISCLOSURE A process is provided for the forming of articles from leaded bronzes of copper alloy base having a lead content of at least 4% and which pro- cess includes cold working, in the forming of pro- ducts or articles, and specifically the forming of bearings. Basically, the process of this invention comprises the forming of stock by chill casting tech- niques and the subsequent alternate steps of cold working and annealing the chill cast stock of pre- determined configuration in forming of a substanti- ally finished product or article having predetermined dimensions and configurations. The alloy is first chill cast into stock of predetermined configuration and is then subjected to cold working to effect a pre- determined dimensional reduction in forming of the de- sired article. Annealing is accomplished between cold working operations which may include more than one pass through the cold working apparatus to obtain a predeter- mined reduction prior to an annealing operation. Also, the chill cast stock may be subjected to an annealing operation prior to the first cold working operations. Utilization of this process results in enhancement of the grain structure of these materials which are initi- ally formed by chill casting procedures as well as ef- fecting a significant increase in the tensile strength and hardness properties of such materials.
367892
Chill James L.
Granger Everett H.
Taylor Harry H.
Marion Bronze Co.
Smart & Biggar
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