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Metal Casting Technologies : September 2006
68 www.metals.rala.com.au Summarising the scope of the characteristics of the most widely used resin processes in the world Chemically bonded sand systems are used worldwide. In looking at the world wide automotive sector where high hourly production from a single pattern is required, green sand seemed to be the obvious method, otherwise resin bonded processes accounted for the majority of castings. However, there are several types of casting which are considered to be ideally produced in green sand which are today more usually produced in the No Bake Process. Finned body electric motor castings (see Weg Motores - Brasil photos) and cast iron motor blocks (see core assembly photos at Caterpillar) are produced using chemically bonded moulds which permit considerable flexibility and allow easy pattern modifications. In addition such dimensional accuracy to minimize machining. Exceptional mould rigidity allows the size of the running systems to be kept to the minimum (especially with SG iron) and the increased mechanical resistance of the mould permits modern moulding plant to deliver mass production (up to 70 small moulds per hour with dimensions about 1000 x 1000mm) of moulds of differing dimensions at the same time. In the case of steel castings, No Bake has practically no competition. There are a handful of foundries using less dependable processes (shell process, green sand). The No Bake Process Casting produced in No-Bake at Weg Motores - Brasil ADVERTISING PROMOTION Article submitted by Impianti Macchine Fonderia (IMF srl) Italy Casting pick-up by Automa from Shake-out at Weg Motores - Brasil