Sunday, November 09, 2008

Neutral Links Bars & Terminal blocks

Neutral Links Bars & Terminal blocks are used as an accessory in Panel Boards & Electrical Board in Industries like Electrical, Electronics & Telecommunications. It is a considered as a backbone in Building Circuit Protections such as MCB, Switchgears, Circuit breaker, RCD etc. Panel Board (Distribution Board) comprising of copper bus bars, brass neutral links, and earth links to facilitate effective distribution of current. It incorporates safety devices such as MCBs, ELCBs and Isolators, which serves to protect the installation. Brass Neutral Link/Bar & Terminals are very crucial components in every application of its nature. It plays major role in Isolation of Electric equipment & clearing faulty downstream, by means of Switchgear and preventing short circuit & protecting electric circuit from damage caused by overload, in the form of Circuit breaker & so on. Because we understand this criticality, we are committed to deliver high class royal quality Brass Neutrals Links & Terminals as per International Standards & Specifications,

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Sunday, November 02, 2008

Brass Casting

Brass Casting, as the name suggests, involves the use of brass as the molten metal. Metal Casting can be carried out by the way of sand casting only. Sand casting can be defined as a 'cast part' produced by formation of a mold from a mixture of sand and pouring the casting liquid (mostly molten metal) into mold. Then the air-cooling of the mold takes place. After the solidification of metal, the removal of mold takes place. The metal used here is brass. It is a known fact that brass is an alloy of copper and zinc. Hence, to be precise, the molten metal consists of two elements.

Sand molding consists of two types- 'Green sand' molding and 'air set' molding. The first one consists of a blend of moisture, clay, silica sand and other additives. The second one makes use of dry sand bonded to all the above materials except moist clay, by the way of using an adhesive, which is fast curing.

At times, there is a placing of a temporary plug (in the mold cavity) to enable the formation of a channel to pour the fluid which is to be molded. The molds of the second type, i.e. the air-set molds result in the formation of a 2-part mold. The two parts are bottom and top. The tamping-down of the sand mixture takes place as it gets added. Many a times, the final assembly of the mold is vibrated to get the sand compacted and get the unwanted voids filled. Then the molten alloy (brass) gets poured into mold. After the solidification and cooling of brass, the separation of casting from sand mold takes place. Normally, such molds are one-time usable.

Patterns: A designer or an engineer provides the design of the object to be produced. On the basis of this design, a pattern is built by an efficient pattern maker by the use of plastic, metal, or wood. Polystyrene can also be used. The DIY Metal Casting would get contracted during solidification. Non-uniformity can also result out of this. Therefore, the size of the pattern should be a bit larger as compared to the final product. 'Contraction Allowance' is the name given to this difference. Brass enters the mold cavity through a runner system including sprue and other feeders.

Divyang A. Pandya