Injection Moulding Technology

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Injection Moulding Technology. Part 3. Quality. Session aim. To improve the delegates understanding of quality issues, relating to injection moulding and how the process can be optimised and monitored. Session objectives. By the end of the session you will be able to:. - PowerPoint PPT Presentation

Transcript of Injection Moulding Technology

No Slide TitleCoWC 0410
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To improve the delegates understanding of quality issues, relating to injection moulding and how the process can be optimised and monitored.
Session aim
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By the end of the session you will be able to:
Calculate Cm and Cmk values.
Explain how weight can be used to monitor
the process.
Session objectives
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Injection Moulding Technology - Part 3
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Injection Moulding Technology - Part 3
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Quality tools
process conditions. e.g. L8 – 7 variables with 2 levels.
DoE (Design of Experiments)
Step-by-step approach to identify all possible failures in a design, manufacturing or assembly process.
FMEA (Failure Mode & Effects Analysis)
SPC (Statistical Process Control)
improve performance.
Explain how weight can be used to monitor the process.
Injection Moulding Technology - Part 3
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3. Potential effects of the failure – High scrap rate
4. Potential causes of the failure – Worn/damaged check ring
5. Current process controls – None
6. Recommended actions – a) Barrel tolerances +/- 100C. b) Monitor cushion position
c) Visual check every 6 months (Abrasive polymers)
PC & GF grades
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developing and understanding patterns.
machine cycle.
the data.
Explain how weight can be used to monitor the process.
Injection Moulding Technology - Part 3
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Terminology
Bottom
Limit
Top
Limit
x
x
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Measured sizes
Case study
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= 99.9997%
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x
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Machine capability
Cm = Measure of the variation present, in relation to the available tolerance.
Total tolerance
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High capability
6 x Sigma 0.4
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Low capability
6 x Sigma 1.6
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Target
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to the available tolerance, combined
targeting of the set-up.
3 x Sigma
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3 x 0.035 (Sigma)
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