仿生金刚石钻头非光滑表面优化研究

Optimization research on non-smooth surface of bionic diamond bit

对仿生单元的直径和排列方式进行研究,探求合理的非光滑表面形态。通过加工四个仿生试样并进行磨耗比测试,实验结果显示:仿生试样B2和B3明显高于B1和B4,其中B3仿生试样最高,比B2高出2%,由此可知,最佳的仿生单元直径为2.0mm;然后加工小口径仿生金刚石钻头,将数个2.0mm仿生单元材料均匀排布于钻头底唇面上,并进行钻进试验,结果显示:仿生单元在合理范围内排布时,仿生金刚石钻头具有较高的钻进效率和较长的使用寿命,否则其性能并不比普通钻头优越。由实验可知,仿生单元均匀排布时,径向角度为24°和30°的仿生单元排布方式比较合理,明显提高了仿生金刚石钻头性能。

The bionic unit diameter and arrangement are researched to probe into the optimal bionic non-smooth surface shape. Four bionic samples were designed and manufactured. After sintering, the abrasion ratios of the four bionic samples are tested . Results show that the abrasion ratio of B2 and B3 are higher than that of B1 and B4, and the abrasion ratio of B3 is highest, 2% higher than that of B2. It is concluded that the optimal diameter of bionic unit is 2.0 mm. Then such bionic units are prepared and arranged on the crown of drilling bits, with which drilling tests are made. Results show that property of bionic units does not show advantages, such as higher drilling efficiency and longer work life, over the normal ones unless they are arranged in a reasonable range. For example, when the radial angle is 24° or 30°, performance of the bits is largely enhanced.