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

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

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

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)

Clear Cover Thermoform by Dayán Páez

Drawing

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

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

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

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