Material Choice & Selection
- Created by: mdonnell985
- Created on: 29-12-17 12:11
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- Material Choice & Selection
- Functional Requirements
- materials used in products should be perfectly suited to the function of the final product
- Properties include, hardness, righty, weight, flexibility, buoyancy, colour or texture, environment and stability
- Economic requirements
- Correct costing and forecasting is fundamental in the manufacture of a product, not only in cost but in working and processing
- costs incurred in the production of a product include time, labour costs, repair and servicing of machinery and electricity. new parts will require additional training for the workforce
- more expensive materials can be justified as they are easier to machine and process
- Manufacturing demands
- products are manufactured using different processes and at different scales of production dependant on consumer demand.
- Continuous , batch , mass , one-off
- products are manufactured using different processes and at different scales of production dependant on consumer demand.
- Material availability
- Wood: sheet , plank or dowel form
- Metal : sheet , plate , box section , tube, rod, wire coil
- Plastic : sheet, block , granules, rod
- Appropriate joining techniques
- Permanent, once this joint has been constructed it cannot be reversed without causing damage
- Welding joins two pieces of metal under heat, causes material to become molten and then a joining material is added to mix them before they solidify
- Brazing permanently joins metal such as copper and steel using an alloy made of copper and zinc
- soldering is similar to brazing but carried out at lower temperatures
- Riveting joins two pieces of metal using metal pins that are put through the sheets then hammered flat
- Adhesives join materials using glues, e.g PVA , contact adhesive and epoxy resin
- frame joints for joining wood, **** , halving, mortise and tenon , dovetail joint
- semi-permanent, can be disassembled without causing damage to materials
- Screws, nuts, bolts and washers used to hold two or more pieces of materials together
- Snap joints used for joining moulded plastic components
- Knock-down fittings join materials with screws, corner blocks used in self assembly or flat pack furniture
- Permanent, once this joint has been constructed it cannot be reversed without causing damage
- Functional Requirements
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