WCA July 2013

Four types of furnace

Wuxi Xinrun Industrial Furnaces offer four types of gas open fire heating furnaces for annealing steel wire. The main features of the furnaces include high heating efficiency, patented pre- mixed combustion technology, high speed convection burners, branded main control components, and user-friendly and safe function designed to facilitate on-site operation and maintenance. The whole furnace is of counter-flow open fire type. The furnace body is combined in several sections. Each heating section is relatively independent, but also affects the others.  The furnace temperature and heating atmosphere can be set according to the requirements of heat treatment process, and re-oxidation of wires can be efficiently avoided.

❍ ❍ Counter-flow open type furnace from Wuxi Xinrun

The temperature and heating atmosphere of each section of the furnace can be controlled independently, using the technology of pre-mixed gas heating. The gas and air will be pre-mixed to the required ratio by the mixer before going into the nozzle for burning. The high-speed heated atmosphere ejecting into the furnace cavity would produce gaseous circulation. The structure is designed so that the temperature of the heating section will keep stable and without partial overheating. As the burning is inside the nozzles, there is no visible fire inside the furnace cavity.

The de-carbonisation and oxidation of wires can effectively be avoided when the temperature and heating atmosphere are set according to the technical process requirements. The supply of gas is controlled by a pressure relief valve, safety shut-off valve and diffusion valve. This system will only work when the pressure of air and gas is stable. Only when the pressure of air/gas and the electricity supply are all stable will the gas supply be used. Wuxi Xinrun Industrial Furnace Co Ltd – China Website : www.wx-xinrun.com.cn

Electroplating made easy

• Collecting pipes feed the working basins; the bath is pumped from the storage tank located below by vertical pumps • Preferably using insoluble anodes and a separate dissolution tank • Covers with counterweight systems and aspiration caps are ideal for containment of fumes • PLC-based control system with touch screen panel for control of the elements of the line and for the automatic calculation and supply of intensity for the coating thickness in function of the speed and wire diameter • Before entering the plating section, the wire needs to be perfectly clean, free of any soap residuals and oxide coming from the previous drawing and heat treatment process in order to have a perfect adhesion of the metal on the steel. In particular, Sirio Wire supplies very efficient electrolytic H 2 SO 4 pickling baths. Sirio Wire Srl – Italy Website : www.siriowire.com

Electroplating is the process of using electrical current to coat an electri- cally conductive object, in the case of Sirio Wire, steel wire, with a relatively thin layer of metal. The primary application of electro- plating deposits a layer of a metal having some desired property, in particular, in corrosion protection or lubricity on the steel wire surface. The wire works as cathode in a conductive solution. The anode can be the metal to be deposited itself or insoluble anodes usually made of activated titanium. A rectifier supplies a direct current to the cathode causing the metal ions in the solution to lose their charge and plate out on the wire. As the electrical current flows through the circuit, the anode slowly dissolves and replenishes the ions in the bath

or, in the case of insoluble anodes, the metal to be plated must be periodically replenished in the bath itself or in a separate dissolution tank as they are drawn out of the solution. Sirio Wire electroplating lines have the following features: • Lines are composed of a set of polypropylene working basins and a set of tanks, made of polypropylene welded plates ❍ ❍ Electro-galvanising line from Sirio Wire

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Wire & Cable ASIA – July/August 2013