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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
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
In recent years, we have witnessed a growing concern of manufacturers and retailers regarding the quality of the jewelry products. Closer attention is being paid to such issues as general aesthetic appearance, surface finish, color consistency, strength and overall durability of jewelry. Responding to the increasing quality requirements, we have made an attempt to develop some specific methods for testing the finished jewelry products including various chains, bangle bracelets, castings and components..... (1998) Complete Story
There is always pressure to reduce the cost of manufactured items and carat gold jewellery is no exception to this situation. In fact, it is only relatively recently (1997) that the economic and currency turmoil in countries like South Korea, Thailand, Malaysia and Indonesia had such an impact on the local gold price that, at times, gold jewellery sales effectively ceased altogether. In Indonesia, for example, at a time when the dollar gold price was falling, the gold price in the local currency increased by 90%. What, then, are some of the ways in which gold jewellery costs can be reduced? One approach is the use of mass production techniques to lower the unit manufacturing cost of items. Such techniques include the well-established chain making, stamping and investment casting, the more recent electroforming and the very recent powder metallurgy processes. These techniques are continually developing as equipment manufacturers make more advances and market their products more widely..... (2002) Complete Story
In a manufacturing environment, there are numerous pitfalls and problems that will conspire to prevent successful completion of a job. Some of these problems may be complex and involve highly technical investigations, explanations and resolutions; however, many are basic, avoidable mistakes that are easily remedied.... (2002) Complete Story
