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Retaining Ring

Retaining Ring. Injection Molding by Dayán Páez. Drawing. Schedule. Design: Oct. 9 th Dayán Páez and Alex Slocum 1 st generation mold: October 15 th Done on EZ-Trak due to broken lathe Optimization: November 8 th Production: December 1 st 2 nd generation: December 3 rd -9 th.

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Retaining Ring

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  1. Retaining Ring Injection Molding by Dayán Páez

  2. Drawing

  3. Schedule • Design: Oct. 9th • Dayán Páez and Alex Slocum • 1st generation mold: October 15th • Done on EZ-Trak due to broken lathe • Optimization: November 8th • Production: December 1st • 2nd generation: December 3rd-9th

  4. Optimization Order • Shot size • Hold time • Cool time Results • SS: 0.70 in • HT: 3 sec • CT: 3 sec “Cycle time” • 8 sec on automatic

  5. Process Details • Process capacity • Cp = .307 • Higher since actual tolerances spec range is greater than 0.005 in. • Cycle Time • 8 seconds, steady state • Number produced • 200 parts, of 5 distinct colors

  6. Conclusion • Rate: hard to increase without a bigger machine (2 at a time) • Flexibility • Geometry: limited • Cool time • Color: great • Cost: low due to small volume • Quality: can be increased through use of proper equipment (e.g. CNC Lathe)

  7. Clear Cover Thermoform by Dayán Páez

  8. Drawing

  9. Schedule • Design: Oct. 9th • Dayán Páez • Limitations • Letters on curved surface • Plastic thickness (0.030 in) • 1st generation mold: October 11th • Done on EZ-Trak due to broken lathe • 2nd generation (poor definition): Nov. 1st • Optimization: November 10th • Production: November 14th

  10. Optimization Criteria: visual quality Order • Form time • Varied between temperature and heat time. Results • Heat time: 30 sec • Form time: 15 sec • Temperature: 575 °F “Cycle time” • ~60 sec in steady state

  11. Process Details • Process capacity • Cp = 4.71 (!) • High due to flexibility in spec range. • Cycle Time • 60 seconds, steady state • Number produced • 100 parts at 1% error

  12. Conclusion • Rate: can best be increased by doing more at a time. • Flexibility • Plastic thickness: limited to ≤ 0.030 in • Cost: low due to small error rate • Quality: heavily dependent on operator

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