钛合金Ti6Al4V高速磨削试验研究

Experimental Studies for High Speed Grinding of Titanium Alloy Ti6Al4V

为实现难加工材料钛合金的高效磨削,进一步发挥高速磨削的潜力,开展了钛合金Ti6Al4V高速磨削工艺试验研究,对磨削过程的磨削力、磨削比能以及磨削温度随单颗磨粒最大切屑厚度agmax的变化特征进行了分析。研究结果表明:不同砂轮线速度vs条件下,磨削力、磨削比能及磨削温度三者随单颗磨粒最大切屑厚度agmax变化的特征曲线略有不同,具体表现为,单颗磨粒最大切屑厚度agmax一定条件下,磨削力及磨削比能随着磨削速度的提高呈减小趋势,磨削温度则呈上升趋势,同时钎焊CBN砂轮的磨削力、磨削比能低于陶瓷结合剂及电镀CBN砂轮的磨削力、磨削比能,因此,利用钎焊CBN砂轮磨料有序排布的优势,选择合理的单颗磨粒最大切屑厚度,可在提高砂轮线速度的同时提高进给速度,从而提高磨削效率,实现钛合金的高速高效磨削。

In order to search the efficiency way to grind the difficult to cut material titanium alloy , and to further improve the potentiality of high-speed grinding ,the high speed grinding tests of titanium alloy Ti6Al4V were systematically conducted ,the variation characteristics of the grinding forces , grinding specific energy and grinding temperature were analyzed when the undeformed chip thickness altered .The experimental results reveals that the characteristic curves of the grinding forces ,grinding specific energy and grinding temperature are different under a variety of the maximum undeformed chips thickness agmax .It practically embodies that when the agmax is constant ,the forces and specific energy decrease slightly while the grinding speed vs rises ,whereas the grinding temperature increases , meanwhile the grinding force and specific energy for brazed CBN wheel is less than that for ceramic bond CBN wheel and electroplated CBN wheel .These phenomena indicate the brazed CBN grinding wheel is the best choice owing to regular distribution abrasives on its surface with adopting the reason‐able agmax ,it means that the grinding speed is increased in proportion to the increases of workpiece vw , thus it is benefit to improve the high speed grinding productivity of titanium alloy Ti6Al4V .