How are products shaped, and how does production scale change the chosen process?
Manufacturing processes for metals, polymers and timbers (casting, forming, moulding, machining, joining) and matching process to scale of production.
A CCEA A-Level Technology and Design answer on manufacturing processes for metals, polymers and timbers - casting, forming, injection and blow moulding, vacuum forming, machining and joining - and how the scale of production (one-off, batch, mass) decides the process.
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What this dot point is asking
CCEA wants you to describe the main manufacturing processes for metals, polymers and timbers, and to match a process to the scale of production (one-off, batch, mass). Injection moulding, vacuum forming and casting are favourite topics, alongside the economics of tooling versus volume.
The answer
Shaping processes by material
Scale of production
Tooling cost versus volume
Worked example: choosing a process for a product at two volumes
Examples in context
Example 1. Drinks bottles. PET bottles are blow-moulded by the billion: a preform is heated and inflated against a mould. The process is chosen for hollow shapes at massive volume, where tooling cost vanishes per bottle.
Example 2. A bespoke staircase. Made one-off by a joiner using machining, jointing and finishing by hand, because a single custom item cannot justify tooling, the opposite end of the scale-of-production spectrum.
Try this
Q1. Name the moulding process used to make a hollow plastic bottle. [1 mark]
- Cue. Blow moulding.
Q2. Explain why injection moulding is not economic for making just ten parts. [2 marks]
- Cue. The expensive mould (tooling) cost is divided over only ten parts, so the cost per part is very high; a low-tooling method would be cheaper.
Q3. Give one product suited to batch production and say why. [2 marks]
- Cue. For example a run of 500 chairs: a set quantity is needed, so tooling and set-up are shared across the batch and the line is then changed over.
Exam-style practice questions
Practice questions written in the style of CCEA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
CCEA 20196 marksDescribe the injection moulding process and explain why it is suited to high-volume production of plastic components.Show worked answer →
Injection moulding forms thermoplastic components. Plastic granules are fed from a hopper into a heated barrel where an Archimedean screw rotates, mixing and melting the polymer and conveying it forward. The screw then acts as a ram and injects the molten plastic under high pressure through a sprue into a closed, water-cooled two-part mould (die). The plastic cools and solidifies to the mould shape; the mould opens and ejector pins push the part out; the cycle repeats.
It suits high-volume production because: the cycle time is short (seconds) once running; the process is highly automated with little labour per part; it gives excellent repeatability and a good surface finish with fine detail; and although the mould (tooling) is very expensive, that cost is spread over a huge number of identical parts, so the cost per part becomes very low. This high tooling cost is exactly why it is only economic at large volumes.
Markers reward a correct sequence (hopper, heated barrel with screw, inject into cooled mould, eject) and the economic argument (high tooling cost amortised over many parts, fast automated cycle).
CCEA 20214 marksExplain the difference between one-off (job), batch and mass production, giving one product example of each.Show worked answer →
- One-off / job production
- a single, often bespoke item made to a specific requirement (e.g. a tailored wedding dress, a prototype, a bridge). Labour-intensive and costly per item, but flexible.
- Batch production
- a set quantity (a batch) of identical items is made, then the line is changed over for a different product (e.g. a run of 500 chairs, a print run of books). Tooling and labour costs are shared across the batch.
- Mass / continuous production
- very large quantities of standardised products made on a continuous line, often automated (e.g. drinks bottles, fasteners, cars). Lowest cost per unit but inflexible and high set-up cost.
Markers want the defining feature of each (single / set quantity with change-over / very large standardised) and a sensible example for each.
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Sources & how we know this
- CCEA GCE Technology and Design specification — CCEA (2016)