How are materials shaped and formed into products, and which process suits which material and scale?
The shaping and forming processes for polymers (injection moulding, blow moulding, vacuum forming, extrusion, rotational moulding), metals (casting, forging, die casting) and timber (laminating, steam bending), and how the process suits the material, the form and the scale of production.
A focused answer to Eduqas A-Level Product Design on shaping and forming processes: injection moulding, blow moulding, vacuum forming, extrusion and rotational moulding for polymers, casting and forging for metals, and laminating and steam bending for timber, with the material and scale each suits.
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What this dot point is asking
Eduqas wants you to know the main shaping and forming processes for polymers, metals and timber, and to explain how the process suits the material, the form and the scale of production. Processes are where a material becomes a product, so questions reward matching the right process to the job and justifying it by cost and volume.
Forming polymers: moulding and forming
Forming metals: casting and forging
Forming timber: laminating and bending
Matching process to material, form and scale
The right process depends on three things: the material (a thermoplastic can be injection moulded, a thermoset cannot be remelted, a metal is cast or forged, timber is laminated or bent), the form (hollow favours blow or rotational moulding, a long constant section favours extrusion, a solid detailed part favours injection moulding or die casting), and the scale of production (high-tooling-cost processes such as injection moulding and die casting only pay off over large volumes, while sand casting and one-off lamination suit low volumes). A strong answer names the process and justifies it by all three, because that is how Eduqas awards application marks.
Exam-style practice questions
Practice questions written in the style of WJEC Eduqas exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Eduqas 20194 marksExplain why injection moulding is suited to mass production of a plastic product, but is not suited to making a one-off prototype.Show worked answer →
A Component 1 short-answer question. Marks for the mass-production strengths and the one-off weakness.
Injection moulding forces molten thermoplastic into a steel mould under high pressure; once the mould is made, each part is produced in seconds, identically, with little waste and a good finish, so the high cost of the mould is spread over thousands of parts, giving a very low cost per part. That makes it ideal for mass production.
It is unsuited to a one-off because the mould (tooling) is very expensive and slow to make, so for a single part the cost per part would be enormous. Award marks for the link between tooling cost and the number of parts. A common dropped mark is not mentioning the mould cost.
Eduqas 20216 marksA company makes hollow plastic bottles and solid plastic crates. Discuss which moulding process suits each, and explain why the process matches the form. Refer to the processes by name.Show worked answer →
A Component 1 extended question marked by levels of response. Reward matching process to form, with named processes.
Hollow bottles suit blow moulding: a tube of molten plastic (a parison) is inflated against a mould by air, giving a thin-walled hollow shape, ideal for bottles. (Large hollow items such as tanks suit rotational moulding.) Solid, open crates suit injection moulding: molten plastic is forced into a closed mould to form a solid, detailed shape in seconds, ideal for rigid, repeatable parts at high volume.
A top answer explains that the process matches the form (blow moulding makes hollow, injection moulding makes solid detailed parts), considers scale and cost, and reaches a clear conclusion that the form of the product, not just the material, decides the process.
Related dot points
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A focused answer to Eduqas A-Level Product Design on wasting and addition processes: sawing, drilling, milling, turning and laser and water-jet cutting that remove material, and welding, brazing, soldering, adhesives, mechanical fixings and 3D printing that join or build up material, with their uses and trade-offs.
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- The classification of materials: papers and boards, natural and manufactured timbers, ferrous and non-ferrous metals and alloys, thermoplastic and thermosetting polymers, elastomers and composites, with named examples and typical product uses.
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- Selecting materials by balancing function, aesthetics, cost, manufacture, availability and environment, and the standard stock forms (sheet, bar, rod, tube, extrusion, section, granules, powder, wire) that materials are supplied in and how stock form affects waste and cost.
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Sources & how we know this
- Eduqas A Level Design and Technology specification (Product Design) — Eduqas (2017)