- 學位論文
高速帶鋸床於H型鋼切削性能研究
Study of Sawing Performance of High-speed Band Sawing Machine on H-beam
摘要
帶鋸床是近50年來陸續發展的機械切削技術，應用相當廣泛，例如：建築業、機械業、設備製造、汽車產業、航太特殊材料等等。帶鋸床為切削大型金屬工件最高效率的工作母機，有鋸切範圍大、鋸切成本低、材料損耗少、材料質變低等優點。 本研究量測帶鋸床鋸切振動、馬達電流及鋸切材料應變，來探討型鋼帶鋸床鋸弓傾斜角度對於鋸切之影響。因鋸臂為最靠近鋸切點之固定件，利用加速規黏貼於兩側鋸臂軸向與徑向量測鋸切時振動，了解鋸切過程中發生之振動行為。此外，因H型鋼切削時鋸帶接觸長度變化大，所以鋸切時振動較大，且因H型鋼之應力影響，會產生夾刀現象，所以將應變規黏貼於切縫兩側，建立應變量測系統來做材料應變量測。馬達為帶動鋸帶的主要動力，當鋸切阻力大時需較大電流來驅動馬達帶動鋸帶持續切削，藉由建立馬達量測系統監測馬達電流變化。利用調整切削率搭配適當之鋸帶速度，來研究切削率、鋸帶速度及鋸弓傾斜角度對振動、電流及應變之相關性。並利用ANSYS Workbench 來建立切削模型，觀察鋸帶的應力分佈以及張力變化，並與實際實驗結果進行比對分析。
並列摘要
Band sawing machine is a mechanical cutting technology, it has developed nearly 50 years. Application in many places, ex: The construction industry, Machinery and equipment manufacturing, Automotive industry, Aerospace specialty materials, etc. Band sawing machine is the most efficient cutter for large metal cutting, its advantages are less material loss, large cutting range, low cost, low material qualitative. In this study, we measurements with cutting vibration, motor current and H-beam strain. Discussion the effects of different bow saws for cutting angle of inclination. The saw arm is fixing member closest point of cutting. Use accelerometer adhesive on both sides saw arm axial and radial to measurement cutting vibration. Understanding the vibration behavior of the cutting process. In addition, Band saw contact length big change with cutting H-beam. So cutting vibration bigger. When band saw cutting, it will be clip because of H-beam stress effect. So the strain adhesive on materials. Establish immediate strain measurement system to measure strain. The main driving force of the motor to drive the saw band. Needs more current to drive the motor driven band saw continued cutting when the big resistance. Establishing motor measurement system to monitor motor current changes. Adjustments cutting rate and band saw speed to study correlation between vibration, motor current and H-beam strain. And use ANSYS Workbench set up cutting force model. Observe the stress distribution and the band saw tension changes and ratio on actual results.