為提高大直徑圓柱齒輪精度，一般使用成形砂輪研磨加工，現有的成形砂輪磨齒機為五軸CNC同動，可實施包含修砂、磨削和線上量測三種工序。此類機台運動較為複雜，精密度高且價格昂貴，一旦撞機，不僅工件報廢，夾治具撞傷，嚴重者則可能造成機械損壞，其維修費用非常高。為防撞機，一般在加工前會執行空跑以測試NC路徑是否正確，由於工序較為複雜，所需的測試時間長，此時機台無法投入生產因而影響生產效率。有鑑於此，本研究建立三維虛擬實境之模擬系統，以方便使用者模擬規劃之NC路徑。此模擬系統不僅可以節省機台空跑的時間，並可避免撞機發生。
本研究利用Visual Basic 2008做為開發平台，以OpenGL圖形庫為三維圖形顯示基礎，研發成形砂輪磨齒機之三維虛擬實境NC路徑模擬與碰撞檢測系統。建立之模擬系統主要分為三大部份(1)NC碼轉譯功能、(2)三維體素(Voxel)建立功能以及(3)碰撞檢測功能。

In order to improve the precision of the cylindrical gear with large-size diameter, the cylindrical gear is grinding by profile grinding wheel. There are three processes of existing simultaneous five-axis CNC gear profile grinding machine, which including dressing, grinding, and on-machine measurement. The motion of this machine is more complicated, and its precision and price are high. Once the collision of machine happens, the workpiece is declared no longer useable and the clamping fixture is damaged. Critically, the charge of the repair for the damage of machine is expensive. In order to avoid the collision of machine, dry run is implemented to test whether the NC path is correct or not before actual manufacturing. Because of the complicated process, it needs to take long time for testing. At this time, the machine is idle and the production efficiency is reduced. Having this in mind, we develop the 3-D virtual reality simulation system in this study to easily simulate the NC path which the user had planned. It’s not only saves the time for dry run, but also avoids the collision of machine.
We use Visual basic 2008 as the developing platform in this study, and the 3-D graphical library of OpenGL as the foundation of graph showing to develop the 3-D virtual reality NC path simulation and collision detection system. The simulation system is divided into three parts: (1) the complier of NC code, (2) the building of 3-D volume pixel, and (3) the detection of collision.

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