| 摘要 |
目前在自動化的機械加工系統中，刀具狀態偵測系統扮演著極為重要的角色，當刀具於加工過程中發生磨耗或崩損時，即時的更換刀具，可有效的減少不良品的產生與提高產品品質與良率
本研究之目的在於開發成形刀刀具狀態偵測系統，針對成形刀之徑向切削力進行測量，以探討切削力之變化對應出刀具發生崩損之位置，進而找出相對應之閥值以建立刀具偵測系統．根據實驗結果可得知，同一把車刀之切削力訊號之重複性極高，但人為裝設刀具造成切削力會有些微的誤差．另外，成形刀具在經過多次的車削加工後，因為刀具的磨耗而造成切削力的增加．最後，根據實驗結果顯示當刀具崩損位置切入工件後其切削力明顯劇增，故切削力本身即可作為辨識刀具損壞之指標，目前可有效的辨別三個刀具崩損之位置，配合切削力之特徵趨勢與訊號自我比對系統，以達到辨識刀具微崩發生位置之目的，目前可偵測之缺口大小約為0.2mm．此系統可有效的達到刀具微崩發生位置之辨識．
關鍵字：刀具狀態偵測、微崩偵測
It is well
known that tool condition monitoring system plays an important
role in automatic machining system. By detecting, and thus
changing the worn tool in time, the loss due to defect products
can be greatly reduced and hence ensuring product quality and
reliability.
The purpose of this research is to develop a forming tool
condition detection and monitoring system for the tool breakage
during cutting process. The method is to set up the threshold of
cutting force signal for each feature of tool chipping by
measuring the radial cutting force. The experimental results
showed that cutting forces signal of the tool during the
continuous cutting process has high repeatability. However,
after resetting the same tool, the cutting force signal has a
little deviation comparing with the last cutting force signal
for man-made errors. Besides, after the tool has manufactured
many workpieces, the cutting force signal will increase for tool
wear is growing. Finally, the experiment result shows that the
cutting force signal increases sharply right after the tool
chipping zone was engaged into the workpieces. A rapid change in
cutting forces can itself be a good indicator to detect the tool
failure. According to the force features received, the tool
chipping detection and monitoring system, that has the capacity
to recognize the chipping position of cutting tool. Now, this
system can detect the dimension of the chipping zone is about
0.2mm. Experimental verification was conducted with a high
degree of success.
Key words: tool condition monitoring, tool chipping detecting.
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