Industrial designLesson 2 of 3 in the course Prototyping and manufacturing

Injection Moulding: Process, Tooling, Advanced Methods, and Production

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Injection moulding is a widely used way to manufacture repeated, precisely shaped parts. This lesson introduces the basic idea, the materials it can process, and why it is especially useful for making large quantities of products.

In injection moulding, material is heated until it can flow, then forced into a shaped cavity inside a mould. The material cools or chemically hardens, taking on the cavity's shape. The mould opens and the finished part is removed.

All flashcards

What is injection moulding?
A manufacturing process in which material is injected into a mould cavity and solidifies or cures into its shape.
Why is injection moulding suited to high-volume production?
Repeated parts can be made with the same tooling, spreading the initial mould cost across a large production run.
What is two-shot moulding?
A process that injects two or more materials successively during one moulding cycle.
What can gas-assisted injection moulding achieve?
It can produce complex or hollow components and may reduce material use and cooling time for suitable designs.
How can injection moulding simulation help engineers?
It predicts filling, packing, cooling, and deformation to evaluate designs before a production mould is made.

Quiz questions

  1. Which unit of an injection moulding machine holds the mould halves closed against injection pressure?Answer: The clamp unit
  2. In injection moulding, what does the term shot mean?Answer: The measured amount of material prepared for one moulding cycle
  3. Why must clamp force be sufficient for a mould’s projected area and injection pressure?Answer: To keep the mould closed while material is being injected
  4. In decoupled moulding, when does the machine typically switch from velocity-controlled filling to pressure-controlled packing?Answer: When the cavity is nearly full
  5. What is the purpose of adding draft to moulded part surfaces parallel to the mould’s opening direction?Answer: To reduce friction and help the part release from the mould

Based on the Wikipedia article Injection moulding, licensed CC BY-SA 4.0. Adapted into a summary, flashcards and quizzes.

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