Chemnitz University of Technology Department of Mechanical Engineering Professorship of Plastics Engineering Prof. Michael Gehde

Transcription

1 Chemnitz University of Technology Department of Mechanical Engineering Professorship of Plastics Engineering Prof. Michael Gehde speaker: M.Sc. Karoline Hofmann 1 co-author: Prof. Dr.-Ing. Michael Gehde 1 1 Professorship of Plastics Engineering, Chemnitz University of Technology, Germany

2 JOINING POLYCARBONATE MANUFACTURING AND EVALUATION OF TRANSPARENT JOINTS USING AN INNOVATIVE OBJECTIVE TEST METHOD 1

3 [1] powerpoint contents 1. introduction 2. methodology 2.1 material 2.2 joining 2.3 test methods 3. results 4. conclusion 2

4 [2] bisphenola motivation characteristics applications problem solution Optical media 100 % Medical devices Building and Construction Electronic 100 % 80 % 80 % Automotive Domestic Appliances Leisure and Safety Other 75 % 65 % 60 % 50 % [3] Vetrotech Packaging 15 % unique non unique [4] Motorradland GmbH [5] Nexi 3

5 [6,7] Silatec GmbH motivation characteristics applications problem solution problem: large - scale laminated safety glass dimensional limitation of the extrusion [7] research aim: joining PC sheets good optical and mechanical properties restoring the transparency invisible connections finding a suitable test method [6] [6] 4

6 methodology material basic material tests (K.-F.-Titration, DSC, tensile-/bending test ) variation of heating time test mechanical and optical testing results mechanical results optical results 5

7 radiator distance joining pressure radiation power drying time 80 C heating time [s] 2 mm 4 mm s 12 mm [8] R. Dietz test results 6

8 stress [MPa] mechanical results PC 2 mm 160 bending stress [MPa] tensile stress [MPa] bending stress [MPa] tensile stress [MPa] heating time [s] test results 7

9 [10] Struers sample preparation [10] saw removal grinding and polishing finishing removing the specimen out of the center of the welded plates removal of the seam forming a flat and even surface stick the specimens to a cylindrical sample holder grinding and polishing in several steps repeat on other side finishing surface using a diamond suspension test results 8

10 optical tests utilized devices photography photoelasticity using a polariscope microscopy [10] Sony [11] Olympus test results 9

11 light intensity measurement laser 2. specimen 3. sample holder 4. micrometer 5. aperture 6. photoelectric cell M B new innovative test method enables qualitative and objective evaluation comparability of all samples detection of defects, joining dimensions and structural changes test results 10

12 current [A] results light intensity measurement PC interpretation of the results from the light intensity measurement reference (air) = 150,986 Ω 0,0331 A 0,035 0,03 0,025 0,02 0,015 0,01 0, ,5 3 4,5 6 7,5 9 10, ,5 15 M - measuring distance [mm] reference (air) t2_50 h = 50s t2_55 h = 55s t2_60 h = 60s test results 11

13 current [A] results light intensity measurement PC 2mm reference (air) t2_50 h = 50s t2_55 h = 55s 2_60 t h = 60s 0,035 0,03 0,025 0,02 0,015 0,01 t h =50s 4,92 mm 0, A 1 A 1 A 2 A measuring distance [mm] t h =55s 6,44 mm A 1 A 2 t h = 50 s 5,1 mm A 1 A 2 t h = 55 s 6,4 mm A 1 A 2 B 6,63 mm test results t h =60s 6,63 mm 12

14 conclusion mechanical results comparable to the basic material strength the higher the tested heating times, the better the results restoring the initial transparence is possible production of transparent connections is possible evaluating the transparency using a new and innovative test method correlation between the test methods test results conclusion 13

15 further investigations joining pressure cooling conditions radiator power heating time affected areas residual stresses validation of the new test method further parameter studies concepts for more efficient surface finishing test results conclusion 14

16 sources: [1] [2] [3] [4] [5] [6] [7] [8] Dietz, R. Aufbau der Infrarotschweißanlage, TU Chemnitz, 2016 [9] [10] [11] N. N.: Digitalkamera-Mikroskop / Polarisation / für AnalyseBX51, abgerufen am:

17 Thank you for your attention contact details: Chemnitz University of Technology M.Sc. Karoline Hofmann Mail: Phone: +49 (0) Web: 16