钛合金小孔电火花加工有限元仿真研究

摘要/Abstract

摘要：

为有效地预测钛合金材料电火花小孔加工的体积去除率，利用有限元法建立了单脉冲电火花加工钛合金小孔的数学模型。模型考虑了诸多因素：高斯热源模型、能量分配率、随放电时间变化的放电半径以及熔融潜热。应用生死单元法模拟出去除体积形貌图，然后计算出单脉冲去除体积。采用K1C高速小孔机加工钛合金小孔，记录加工时间，利用称重法得出加工前后重量，从而算出单脉冲体积去除率。验证实验得出，实际加工单脉冲体积去除率和模拟结果的误差小于10%，结果表明，仿真模型可较准确地预测体积去除率，为指导电火花加工钛合金小孔提供了依据。

关键词: 电火花加工, 钛合金小孔, 数学模型, 体积去除率

Abstract:

In order to predict volume removal rate of small-hole on titanium alloy drilled by EDM efficiently, a mathematical model of single-pulse on drilling small-hole on titanium alloy was developed with the application of finite element simulation. The model utilized several important parameters such as Gaussian heat source model，percentage distribution of the heat input among workpiece, spark radius with the discharge time and latent heat of melting . The picture of removed volume was simulated with the method of elements with birth and death. Then the volume removal rate was calculated finally. An experiment of drilling small-hole on titanium was carried out on K1C high-speed machining, time was recorded. Weighing method was applied to get the weigh before and after EDM. Then, the volume removal rate by single-pulse was calculated. Compared simulation and experimental results, the error is less than 10%. The model has the preferable prediction precision on volume removal rate by EDM. Consultation is provided to guide small-hole on titanium alloy drilled by EDM.

Key words: electrical discharge machining(EDM), small-hole on titanium alloy, mathematical model, volume removal rate

中图分类号:

TG66

王续跃, 胡辉, 梁延德, 徐文骥. 钛合金小孔电火花加工有限元仿真研究[J]. 中国机械工程, 2013, 24(13): 1738-1742,1748.

WANG Xu-Ti, HU Hui, LIANG Yan-De, XU Wen-Ji. Finite Element Simulation of Small-hole on Titanium Alloy Drilled by EDM[J]. China Mechanical Engineering, 2013, 24(13): 1738-1742,1748.

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