Improvement of micro-deep drawability by using punch surface with micro-ridges

[[abstract]]產品日漸小型化，使得微小杯型深引伸零件需求日漸增多，跟其他製程比較起來，精微引伸具有高量產性、高效率、低成本等優點，因此成為極重要的生產製造技術。由於薄板材料會降低引伸成形性，造成微小杯型深引伸零件成形困難。本研究目的係藉由沖頭表面微凸脊(Micro Ridges)以提升微小深引伸成形性。其概念係藉由沖頭表面接近鼻端之微凸脊，分散沖頭對板材的引伸力，並延遲板材破裂。本研究首先以帽型圓杯內徑3 3 mm、凸緣外徑4 2 mm、板厚0 2 mm、深度2 1 mm之黃銅零件為載具；接著設計沖頭表面微凸脊，並以DEFORM 2D 軟體模擬沖頭有/無微凸脊的成形性，利用田口法探討沖頭表面微凸脊之最佳幾何尺寸；而後，設計與製作引伸模具，透過實驗來驗證分析結果；最後，板材經熱處理退火製程使材料具有不同晶粒尺寸，再進行引伸率實驗，比較有/無微凸脊沖頭之極限引伸率(LDR)，藉以了解沖頭表面微凸脊 對板材在不同晶粒尺寸下之成形性變化。本研究結果顯示，DEFORM 2D軟體可準確的模擬具有微凸脊沖頭的帽型黃銅載具微小深引伸過程，沖頭表面有微凸脊較無微凸脊增加引伸力約3%，沖頭表面具有微凸脊提升成形深度100%以上。載具深引伸製程驗證研究結果，沖頭表面有微凸脊較無微凸脊增加引伸力約4%，沖頭表面具有微凸脊提升成形深度100%以上。經由LDR方法實驗得知，沖頭表面具有微凸脊對於不同晶粒尺寸材料平均可增加極限引伸率10 8%。[[abstract]]Because of product miniaturization demand for cups created by deep drawing has increased However because thin sheet materials exhibit poor deep drawing formability using deep drawing on micro/meso cups is rather difficult In this study punch with microridges on surface were used to enhance deep drawing formability The concept was based on the observation that punch with microridges near the punch nose could disperse the drawing forces of punch on sheet materials and delay the cracking of sheet materials In this study cylindrical cups composed of copper alloy were used as the speciman At first punch with microridges were designed and the DEFORM 2D software was used for analyzing the difference in the formability of deep drawing by using punch between with and without microridges Meanwhile Taguchi method was used to find the optimal structure of the micro ridges Secondly drawing dies were designed and produced and a confirmation experiment was conducted to verify the results of the analysis The study results of cylindrical cups indicated that DEFORM 2D software can be used to simulate the effect of microridges on deep drawability accurately A comparison between the two punch surface types revealed that punch with microridges on surface exhibited a slightly increased drawing force (4%) compared with those without microridges Concurrently the effect of punch with microridges increased forming height by at least 100% A study of different grain size on drawability with microridges on punch has also beeb carried out in this research Punch with microridges will increase the LDR more than 10% in average for different grain siz

具四連桿機構之浮動式複動鍛造成形模組

[[abstract]]本創作係有關於一種具四連桿機構之浮動式複動鍛造成形模組,其包含有一上模座,一與上模座上、下對應設置之下模座,一設於上模座上之上衝頭,一設置於下模座上之下衝頭,一設置於下模座下方之浮動基板,一位於上、下模座間之承座,一滑設於承座上之分裂模座,以及連設分裂模座與上模座之四連桿機構等構件；當上模座往下模座進行合模時,該上模座可藉助四連桿機構的連動,使各個分裂模往合模方向推移,產生分裂模座的合模動作,再利用浮動基板的設置,又使分裂模座連同承座往下移動，以完成鍛料之複動化鍛造成形,而能使本創作具有完全密閉鍛造之功效者

DEVICE FOR MEASURING THE FRICTION COEFFICIENT

[[abstract]]一種摩擦係數測試裝置包括：一基座；一對磨板，設置在該基座上，且該對磨板包括一承載面；一框架，圍繞在該基座及該對磨板的周圍，呈現一口字型；一加壓單元，穿過該框架；一非接觸支撐力，形成在該框架與該基座之間用以使該框架與該基座之間保持間隙；一第一力量計，設置在該加壓單元下方；一第二力量計，其一端用以連接該物件；以及一驅動單元，設置在該基座上，並連接該第二力量計之另一端，用以拉動該第二力量計、該物件及該框架

DEVICE FOR MEASURING THE FRICTION COEFFICIENT

[[abstract]]一種摩擦係數測試裝置包括：一基座；一對磨板，設置在該基座上，且該對磨板包括一承載面；一框架，圍繞在該基座及該對磨板的周圍，呈現一口字型；一加壓單元，穿過該框架；一非接觸支撐力，形成在該框架與該基座之間用以使該框架與該基座之間保持間隙；一第一力量計，設置在該加壓單元下方；一第二力量計，其一端用以連接該物件；以及一驅動單元，設置在該基座上，並連接該第二力量計之另一端，用以拉動該第二力量計、該物件及該框架