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| [377] Causes and Prevention of Defects in Wrought Alloys |
Much of the recent literature on defects that occur in jewelry manufacture is focused on those occurring in lost wax investment casting, However, defects can also occur during casting of ingot and its fabrication into sheet, tube, wire and rod as well as their onward fabrication into jewelry components by processes such as stamping and forging. These defects, along with their causes and prevention, are
briefly reviewed in this article.... (2002)
 Complete Story |
| Show me more articles from: [The World Gold Council]|[Mark F. Grimwade] |
| Releated Categories:[Metals]|[Jewelry Mass Production] |
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| [961] Causes and Prevention of Defects in Wrought Alloys |
Much of the recent literature on defects that occur in jewellery manufacture is focused on those occurring in lost wax investment casting. However, defects can also occur during casting of ingot and its fabrication into sheet, tube, wire and rod as well as their onward fabrication into jewellery components by processes such as stamping and forging. These defects, along with their causes and prevention, are briefly reviewed in this article, although those defects occurring in the die-striking of findings are described elsewhere in this issue....
(2002)
Complete Story |
| Show me more articles from: [The World Gold Council]|[Mark F. Grimwade] |
| Releated Categories:[Jewelry Mass Production]|[Metallurgy]|[Casting Troubleshooting] |
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| [351] Cold forging of karat gold findings |
Cold forging in the karat gold jewelry industry has sometimes been referred to as stamping, coining and die striking. This process has been used throughout history in the making of coins and medals as well as jewelry. Cold forging basics will always be the same as they were during antiquity; however, the fine points are constantly being refined. The process is simply described as forming a finding by using extreme force to drive raw material into a shaped cavity in a steel block. While it may sound simple, there are many subtle conditions that will effect the outcome.... (2002)
Complete Story |
| Show me more articles from: [The World Gold Council]|[Fred Klotz] |
| Releated Categories:[Die Forming] |
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| [1018] Colored Gold Alloys |
From ancient times, gold has been used mostly in decorative items, and the colour of gold plays an important role in this application field. Different methods have been developed to objectively characterize the colour. This paper describes the CIELAB system, which has gained acceptance as an effective way to assess colour. The different coloured gold alloys known today are also described, with emphasis on the relationship between their metallurgy and their colour.... (2012)
Complete Story |
| Show me more articles from: [The World Gold Council]|[Cristian Cretu and Elma Van Der Lingen] |
| Releated Categories:[Metallurgy] |
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| [641] Colored Karat Golds for Investment Casting |
In modern melting and casting technology, the need for products able to front competition in the field of quality and price encourages the development of new alloys that can guarantee better performance. Most significant innovations have taken place in alloys for investment casting, to improve the quality of castings. Additions of many elements to gold alloys have been experimented, but only a few of them appear to be sufficiently effective and easy to use. In this paper, we describe work carried out to examine technical and practical performances of some yellow 18 carat gold with additions aiming chiefly at improving alloy castability. Alloys of different composition have been tested and the effects of the different alloying additions have been compared, in order to find the addition elements that show better performance and able to give a true improvement of the quality level of the castings.... (2001)
Complete Story |
| Show me more articles from: [The World Gold Council]|[Damiano Zito] |
| Releated Categories:[Metallurgy] |
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