New-Technique Drilling with Modulated Rotation Spindle Machine

Abstract:

In drilling deep holes with small-diameter tools in particular, chip shape is a major problem along with tool rigidity. In this study, we developed a spindle machine that has regularly repeating acceleration and deceleration regions in each drill rotation (called modulated rotation) as a new drilling spidle machine that can improve chip discharge ability. For an analysis of the cutting mechanism based on the basic principles of this device and its drilling characteristics, holes were drilled in CFRP, and Ti alloy (Ti-6A1-4V) materials using a straight shank drill. The relationship between the torque and thrust of cutting resistance force was obtained to show the relationship between cutting chips shape and cutting force. The characteristics of drilling with the developed spindle device were evaluated in comparison with regular drilling methods. It was found that the torque with this device was reduced by about 10% compared with general drilling. Outstanding chip breakup was seen with Titanium alloys in particular, as a result of which chip discharge could be improved.

• Periodical: Advanced Materials Research (Volumes 816-817)
• Pages: 206-210
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.816-817.206
• Online since: September 2013
• Authors: Takashi Inoue, Masahiro Hagino, Yuuki Kurita, Kimitoshi Watanabe, Kazuya Ueda, Yasumitu Shimizu
• Keywords: Carbon Fiber Reinforced Polymer/Plastic (CFRP), Cutting Chip, Modulated Rotation, Spindle, Titanium Alloy

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