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GVSU EGR 367 - EGR 367 Manufacturing Processes Lab

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EGR 367 Manufacturing Processes LabPlastics – Vacuum FormingJason ScholtenTim AdamsDate Completed: 3/21/00Date Reported: 3/24/00Table of ContentsTopic PageObjective 3Analysis of DataDiscussion of ResultsEGR 367 Manufacturing Processes LabPlastics – Vacuum FormingJason ScholtenTim AdamsLee GroenewegDate Completed: 3/21/00Date Reported: 3/24/00- 1 -Table of ContentsTopic PageCover Page 1Table of Contents 2Objective 3Procedure 3Data 3Analysis of Data 4Discussion of Experimental Results 5Overall Conclusions 5- 2 -Objective: To explore the process of vacuum forming, and determine the relationship between process parameters.Procedure: - Pre-heated the oven to 520 -F (use thermocouple to measure temperature in oven)- Cut plastic sheets (polyethylene) to correct size to fit in clamping mechanism- Determined amount of time (high and low time) to heat the plastic- Placed plastic sheet in oven for the determined amount of time - Pulled plastic sheet from oven, placed over the vacuum former, and started the cycle- Cut pieces down the center and measure the thickness at large and small radii.Data: Oven Temp -520oFForehead(largeradius)Mouth(smallradius)Time (sec.) t11 (in.) t21 (in.) t31 (in.) Avg. t1 (in.) t12 (in.) t22 (in.) t32 (in.) Avg. t2(in.)20 0.0150 0.0180 0.1700 0.0677 0.0160 0.0220 0.0220 0.020025 0.0190 0.1400 0.0160 0.0583 0.0150 0.0130 0.0160 0.014730 0.0170 0.0120 0.0170 0.0153 0.0340 0.0270 0.0310 0.0307Table 1: Data collected in lab from vacuum forming process- 3 -Analysis of DataGraph 1: Main effects for thickness vs. time for a large radiusGraph 2: Main effects for thickness vs. time for a small radius- 4 -Large Radius Sheet Thickness vs. Time in Oven for Vacuum Forming Process0.00000.01000.02000.03000.04000.05000.06000.07000.08000 10 20 30 40Time (sec)Thickness (in.)sheet thicknessSmall Radius Sheet Thickness vs. Time in Oven for Vacuum Forming Process0.00000.00500.01000.01500.02000.02500.03000.03500 10 20 30 40Time (sec)Sheet Thickness (in.)Sheet ThicknessDiscussion of ResultsThe graphs above show the effect of time in the oven on the thickness of the finished part. The first graph is for a large external radius which became thinner for longer times in the oven. The second graph is for a small internal radius. This thickness became larger as the time in the oven was increased. Overall Conclusions:The graphs shown above agree with what would be expected. The first graph is for an external radius where material would flow away as temperatures increase. The smaller radius was an internal radius where itwould be expected that material would flow into as the temperature increases, thus causing it to be thicker.- 5


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