摘要
本研究為探討第四代自行研製的模內壓力感測器的缺失，並且加以改良設計新型的壓力感測器。在第四代壓力感測器中有二項缺點：第一，第四代壓力感測器乃是為了解決之前壓電晶體PZT(鋯鈦酸鉛)破裂問題，所以使用彈簧來保護PZT，彈簧選用乃是基於現有的商業彈簧設計尺寸，卻使得軸向頻率降至1.7kHz。低於射出成型機施加負載時作動頻寬約在2kHz。第二，一般射出成型機射出瞬間時間為0.001秒，但第四代壓力感測器受壓力作動後趨於穩定的時間為0.8秒。針對缺失，本研究重新設計壓電晶承體以及一彈性元件，在壓電晶承體材料方面改為絕緣性佳且剛性大的陶瓷。使用ANSYS軟體作結構力學的靜、動態分析，包括壓力感測器工作應力分析，模內壓力與電壓輸出之相應關係，自然頻率、振型及諧振響應分析。
並列摘要
This research is to confer the fourth generation of mold cavity pressure sensor’s shortcomings which was made by oneself, and a new pressure sensor is improved and designed. There are two shortcomings in the fourth generation of pressure sensor: First, in order to solve the PZT problem of crack, the fourth pressure sensor uses the spring to protect the PZT. The existing commercial spring causes the axial frequency to drop to 1.7 kHz which is lower than the injection molding machine’s frequency approximately in 2 kHz. Second, The injecting time of a general injection machines is lower than 0.001 second, but when the fourth pressure sensor was pressured, the time tends to stable is 0.8 second. To disappearances, in this study, we redesign the structure of piezocrystal and the elastic element. Utilize insulation of ceramics and rigidly is strong to as the piezocrystal structure. Use the ANSYS to do the static, dynamic analysis of pressure sensor, the relation that the pressure corresponds with what the voltage outputs in the mold, natural frequency, modal shape and transient analysis.