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BTEC FIRST DIPLOMA ENGINEERING unit 22

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Introduction

Unit 22 casting and moulding Pass 1 identify a method of producing molten material safety for a given scale of casting or moulding production Steel and aluminium are the metals most commonly sand cast and the process is ideally suited for manufacture. The advantages of sand casting include enabling components to be made easily and cheaply Sand casting patterns are traditionally made from woos such as yellow pine. Patterns can be single piece flat backed or split depending on the shape of the finishing casting flat backed patterns contain all the detail on one side and are the simplest patterns to cast After taken out any remaining sand still attached to the casting is removed by shot blasting Unit 22 casting and moulding Pass 2 There are ...read more.

Middle

Remove the pattern. 4. Fill the mold cavity with molten metal. 5. Allow the metal to cool. 6. Break away the sand mold and remove the casting. Investment casting Investment casting is when beeswax formed the pattern, to today's high-technology waxes, refractory materials and specialist alloys, the castings allow the production of components with accuracy, repeatability, versatility and integrity in a variety of metals and high-performance alloys Unit - 22 casting and moulding Pass 4 - describe the process of investing casting when used safely to manufacture a given component Investment casting is an industrial process based on and also called lost wax casting, one of the oldest known metal-forming techniques. ...read more.

Conclusion

It is generally more expensive per unit than die casting or sand casting but with lower equipment cost. It can produce complicated shapes that would be difficult or impossible with die casting, yet like that process, it requires little surface finishing and only minor machining Produce a master pattern: An artist or mold-maker creates an original pattern from wax, clay, wood, plastic, steel, or another material. Mold making: A mold, known as the master die, is made of the master pattern. The master pattern may be made from a low-melting-point metal, steel or wood. If a steel pattern was created then a low-melting-point metal may be cast directly from the master pattern. Rubber molds can also be cast directly from the master pattern. The first step may also be skipped if the master die is machined directly into steel. Anthony Collins ...read more.

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