If you are wondering a setup technician or molder is good enough or not, and want to make sure. What will you do? You can try with these 20 basic questions which are suggested by WJT Associates. They will be very useful for you.
1. Explain why you set the mold at full open to that distance?
2. Explain why did you set the ejector plate at that speed to actuate at that position?
3. Explain setting the logic behind your setting the clamp speeds - clamp depressurization, slow open, fast open, open slow down, full open, fast close, slow close and clamp-up.
4. Explain how you set the clamp pressure.
5. Explain how you set the fill speed.
6. Explain the procedure for setting the fill pressure.
7. Explain how you determine the switchover point from fill to pack.
8. Explain how you determine the packing pressure.
9. Explain how you determine the packing time.
10. Explain what determines when you open the mold up to eject the part. (Wrong answer: "When it's cool enough")
11. Explain how the cushion is determined.
12. Explain how to determine the screw speed/back pressure?
13. Explain how to determine the settings on the melt temperature controls. (Wrong answer: "I set them all at 400F and when I measured the melt temperature it was 400F)
14. Explain how every technician who measures the melt temperature will get the same reading.
15. Explain how with a mold with more than eight circuits per side the waterlines will be hooked up the same way as now.
16. Explain where you get the setting for the waterline's temperature. (Wrong answer: “We’re using tower water.”)
17. Explain how you know you are getting optimal flow through the water system. (Wrong answer: “We got her wide open.”
18. Explain how you can put the mold into a larger (or smaller) machine next time based on the settings you have now, and NOT have to start up from scratch trying to find the same conditions for the plastic on the new machine?
19. Explain how you know the molding machine is the adequate for the size of the shot? (Wrong answer: "We're running it there aren't we?")
20. Explain how you know the machine is capable of producing a repeatable process? (Wrong answers: (1)"It's making good parts isn't it?" (2) "We have a scrap allowance that covers it.")
After these questions and their answer, you might evaluate their skill and knowledge.
Source: http://wjtassociates.com/site/wp-content/uploads/2013/11/20-questions.pdf
No comments:
Post a Comment