How are products shaped by bending material or by melting and reforming it?
Deforming and reforming processes: shaping by deforming material (line bending, vacuum forming, press forming, laminating) and by reforming it from a liquid or molten state (casting, injection moulding, blow moulding), and matching the process to the material and quantity.
A focused answer to OCR GCSE Design and Technology J310 on deforming and reforming processes: shaping by bending material and by melting and reforming it, and matching the process to the material and quantity.
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What this dot point is asking
OCR J310 groups further manufacturing processes as deforming (shaping a solid material) and reforming (melting and reforming it). You need to explain the difference, give examples, and match a process to the material and quantity. In the written exam this is tested by distinguishing the two and by explaining why a moulding process suits mass production.
Deforming processes
Deforming keeps the material solid, so the process relies on the material being able to bend or stretch (thermoplastics when warm, ductile metals).
Reforming processes
Reforming needs a mould (tooling), which is expensive to make, so it pays off only over large quantities, where each part is then made fast and cheaply.
Try this
Q1. State whether vacuum forming is a deforming or a reforming process. [1 mark]
- Cue. Deforming (the sheet is softened and shaped while still solid, not melted).
Q2. Give one reason injection moulding suits mass production. [1 mark]
- Cue. Once the mould is made, each part is fast, identical and very cheap, so the cost per unit is low at volume.
Exam-style practice questions
Practice questions written in the style of OCR exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
OCR J310/01 20184 marksExplain the difference between a deforming process and a reforming process, giving one example of each.Show worked answer →
A 4-mark question: marks for each process explained and exemplified.
A deforming process changes the shape of a material without melting it, usually by force and sometimes heat to soften it, while it stays solid, for example line bending (strip-heating) acrylic to fold it, or vacuum forming a heated sheet over a mould.
A reforming process melts or liquefies the material and forms it in a mould, where it sets into the new shape, for example injection moulding molten polymer into a mould, or casting molten metal.
Markers reward: deforming shapes the solid (with force, maybe heat) and reforming melts then sets in a mould, each with a correct example. Swapping the examples, or saying both melt, loses marks.
OCR J310/01 20214 marksExplain why injection moulding is suitable for making large quantities of a plastic product such as a bottle cap.Show worked answer →
A 4-mark Explain wants the process linked to high-volume production.
Injection moulding forces molten polymer into a metal mould under pressure, where it cools and sets into the exact shape, then the mould opens and ejects the part. Once the mould (the expensive tooling) is made, each cap is produced very fast, identically and with little waste, and the cycle repeats automatically, so the cost per cap is very low at high volume.
The trade-off markers like to see: the mould is costly to make, so injection moulding only pays off over large quantities; it would be far too expensive for a one-off. Markers reward: molten polymer into a mould, fast identical repeats, low cost per unit at volume, and the high tooling cost. A bare "it is quick" caps the mark.
Related dot points
- Wastage and addition processes: shaping by removing material (sawing, drilling, turning, milling, laser cutting) and by joining material together (adhesives, mechanical fixings, welding, soldering), and choosing the right process for a material.
A focused answer to OCR GCSE Design and Technology J310 on wastage and addition processes: shaping by removing material and by joining material together, and matching the process to the material.
- Scales of production: one-off (bespoke), batch, mass and continuous production, the features and trade-offs of each, and how the scale influences process choice, cost and the use of CAM.
A focused answer to OCR GCSE Design and Technology J310 on scales of production: one-off, batch, mass and continuous production, their features and trade-offs, and how scale drives process and cost.
- Polymers: thermoforming (thermoplastic) and thermosetting polymers, the difference between them, their physical and working properties, common examples, and typical uses.
A focused answer to OCR GCSE Design and Technology J310 on polymers: thermoforming and thermosetting plastics, the difference between them, their properties, common examples and typical uses.
- Metals: ferrous metals, non-ferrous metals and alloys, the difference between them, their physical and working properties, common examples, and typical uses.
A focused answer to OCR GCSE Design and Technology J310 on metals: ferrous metals, non-ferrous metals and alloys, the difference between them, their properties, common examples and typical uses.
- Quality control and accuracy: tolerances and how to read them, quality control checks during production, and using jigs, templates, patterns and CAM to ensure accuracy and consistency in batch and mass production.
A focused answer to OCR GCSE Design and Technology J310 on quality control and accuracy: tolerances and how to read them, quality checks, and using jigs, templates and CAM for consistency.
Sources & how we know this
- OCR GCSE (9-1) Design and Technology (J310) specification — OCR (2017)