| Summary: | 博士 === 國立彰化師範大學 === 電機工程學系 === 102 === This dissertation deal with the straightness deviation compensation for a ram-type spindle, which is to ensures that the accuracy of the straightness retained within an acceptable requirement while the ram is moving in the full travel. This research utilize hydraulic force to pull the ram structure to resist the falling accuracy, which is to raise the deviation caused by the weight of ram and gravity while ram stretching out of the support bracket. To ensure the tolerance while the ram reciprocates forth and back, the deviation of straightness accuracy of ram falling still meet the requirement of international accuracy standard, while the spindle performs the application of boring or facing.
This dissertation applied the simulation by FEM and analyzed the performance of the mechanical structure of ram. According to the data base of the analyst, the compensation device for straightness tolerance control applied. In addition, a suitable hydraulic device is selected, and the electrical compensation device is developed. The simulation for the compensation device was done by Pspice software which is to confirm the applicability for ram straightness tolerance control. The experiment is done by checking the straightness of ram movement, face cutting and ball bar test. Then the testing piece was measured by 3D coordinate measuring machine which is to verify the dynamic accuracy under the compensation condition. The experiment discovered that the average value of accuracy is 31 μm under the machining condition without compensation device applied. After activating the ram compensation device, the result showed the average value of accuracy is 2 μm, which shows a great improvement of the accuracy for 29 μm. This finding revealed that the compensation device can promote the straightness accuracy and enhance machining capability for milling and boring accuracy. The research approved the applicability of ram type boring spindle. The machine is applicable to get into the high end international market.
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