目前大多數商用加工驗證軟體如Vericut、UG NX等，需製作CNC控制器的模擬器來模擬工具機的運動指令並以此做為加工模擬的基礎。此做法需耗費額外成本因應各種不同控制器製作模擬器，且其模擬結果易有誤差。對此本文發展一套開放式虛擬工具機系統可透過網路與CNC控制器通訊，獲取加工路徑資料並進行模擬。
此方法只需製作資料收集器即可應用於各種類型之控制器，大幅減少製作控制器模擬器的成本，且因指令來自真實控制器，因此模擬的結果不會有運動指令上的誤差，可達到更精確的模擬預測效果。此外開放式架構之虛擬工具機具有可擴充性，使用者可取得現有模組的資訊自行設計新的功能模組，達到加值的效果。
本文亦針對控制器之後加減速規劃所產生的輪廓誤差進行改善，提出一套流程，根據由控制器獲取之路徑資料進行分析，可找出轉角及圓弧之誤差，並依推導出的公式計算適合的進給率，將誤差減至目標值內，其必要資訊皆可從控制器取得。
最後，本文以鞋模及輪圈加工範例測試本文發展之開放式虛擬工具機系統，並比較控制器模擬器與真實控制器的模擬結果。以手機殼加工做為圓弧及轉角誤差改善的範例，比較改善前後之圓弧及轉角誤差。

Most commercial software for machining verification, such as Vericut and UG NX, requires a computer numerical control (CNC) controller simulator to generate motion commands for machining simulation. However, making a controller simulator takes a lot of work and this approach can lead to inaccurate machining simulation.
Therefore, in this research, an open virtual machine tool system is developed, which can access the tool path data from a CNC controller via network communication and apply these data to simulate machining. The proposed method can be applied to various types of controller and only requires making a connector, lowering the cost of making a controller simulator. Because the motion commands are from a real controller, there is no error in the motion commands in the simulation, increasing accuracy. In addition, the open architecture virtual machine tool is extendible. Users can access the information of existing modules and design new application modules.
This research also modifies the feedrate to reduce contour error due to acceleration and deceleration control after interpolation (ADCAI). The proposed method analyzes the tool path data from the controller and finds arc and corner errors. It then calculates the appropriate feedrate for reducing the errors to the target. All required data can be accessed from the controller.
Finally, a shoe mold machining process and a wheel rim machining process are taken as case studies to test the performance of the proposed virtual machine tool. The simulation results are compared with the results obtained using a controller simulator. A phone case machining process is used to test the improvement. The results with and without improvement are compared.

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