• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Casing Research

Extracts from this document...

Introduction

Casing Research PLYWOOD Plywood is a manufactured board. It is used to case speakers. Birch-faced ply is a light coloured, high-quality plywood that colour-stains and varnishes easily. CHIPBOARD Chipboard is also a manufactured board. It is cheap and will not warp or curl. Chipboard comes in two forms, plain and woodgrain, both of which are usually coated in plastic 'foil' or veneered to improve the finish and looks. MDF MDF (Medium Density Fibreboard) is another manufactured board. It used to fabricate boxes, and close-textured MDF is cut and sanded to make moulds for vacuum forming plastics. MDF must be glued using PVA carefully and precisely, and requires coating with paint many times to give a good finish, as it absorbs liquids readily. Mild Steel Mild steel can be found in many different forms. Sheet steel, for example, is made into casings and a variety of brackets an fixings. Bright drawn steel is made into round, square, tubular, angled and flat bar versions. Mild steel can be cut and shape into components that are to be permanently fixed to the product. ...read more.

Middle

Acrylic becomes malleable when heated and can be easily machined. It is also possible to cement pieces of acrylic together using methylene chloride glue. When polished, acrylic must be handled carefully as its surface dents and scratches easily. POLYSTYRENE Polystyrene comes in many forms. One such form is a thin sheet of polystyrene that is used in vacuum forming machines to fabricate a casing. It has a low melting point and is fairly weak, but unlike acrylic it is not brittle. Polystyrene is also an excellent insulator, minimising any chance of electrocution by the product. It can be cut and assembled rapidly, but it takes time, precision care and effort to manufacture a quality product casing. Plastic casings can be made in a variety of ways. Injection moulding is the most common method of manufacturing casings in industry. The machine makes a casing in three stages: Step 1: The mould is warmed and the thermoplastic substance is placed in the heating chamber. ...read more.

Conclusion

Step 2 A heating element is pulled across the top of the plastic sheet, heating it until it crinkles, then becomes taught again. Step 3 The platform is raised, and the mould is pushed into the plastic. Step 4 The air is then pumped out of the chamber, and air pressure (now greater than inside the machine) presses the sheet over the mould. Step 5 The sheet is removed from the machine (assisted using a taper, which angles all vertical sides of the casing). Excess plastic is trimmed from the casing. The mould is usually constructed from layers of MDF. It is solid because air pressure given no resistance can crush hollow moulds. If the mould is too far down, webbing (plastic sticking together in corners) occurs, not leaving enough plastic to give a full coating on the mould. The mould is smoothed to avoid bumps and lines on the casing. Air pockets are prevented by drilling holes in the mould, allowing excess air to flow into the vacuum. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Resistant Materials section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Resistant Materials essays

  1. Existing product research

    It has a size of 120cm x 60cm x 43cm. It is made from solid oak, just like the piece from before. They have used solid oak because, it suits this simple design best.

  2. EFFECT OF MOISTURE ON THE MECHANICAL PROPERTIES OF NYLON

    CONTROL OF FEED Control of feed involves control of the ratio of virgin to regrind resin of particle size, and of the level of the material in the hopper. Change in processing characteristics (melt viscosity due to change in mol.

  1. TASK: Turning a Mild Steel Bar.We were each given a mild steel bar to ...

    not all in one go as you had to be as accurate as possible, a margin of error was set at +/- 0.1mm. The micrometer was again used to find the diameter. At this time a lot of metal shavings, called swarf , maybe present around the bar, it is

  2. educational toy

    (person or group) when learning (What) The educational toy will be used ....... (describe where / when it will be used). The educational toy will describe how it will work. Homework Collect information about different educational toys similar to the one you will design. Back to top Objective 2 Task No 4 Objective 2 Time: 30

  1. We have been asked to redesign the conveyor belt system on a Cold Milling ...

    There also needed to be a idler close to the tail pulley because if the idler was after the feed chute too much material would fall back.

  2. Copper Research.

    3 = Minor injury 2 = Negligible 1 = None Likelihood 5 = Certainty 4= Probable 3 = Possible 2 = Remote 1 = Unlikely Rate = Severity x Likelihood 15 -> 25 Too dangerous, consider not doing activity; 12 -> 14 Activity possibly dangerous, but might be carried out

  1. Customer research.

    Most of the people I asked said recyclable material, which is very, environmental and health wise, good. So the products I will design will not affect anything or anyone and does not go against people's views about biodegradable and degradable materials and the environment.

  2. Aluminium is a lightweight, silvery metal.

    History Aluminium is never found in its metallic form in nature. It occurs as bauxite, a mixture of aluminium oxides, iron oxides and clay. Being so difficult to isolate, aluminium wasn't discovered until 1807, by Sir Humphry Davy (who also discovered potassium and sodium and invented the miner's safety lamp).

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work