Abstract: In order to realize the micromachining on local area of wires, a new grinding method was proposed. Through the force condition analysis of the deflected wires, the jacking force formula was deduced. The pressure distribution in contact area and cutting depth distribution of the grains were modeled respectively. Based on the relationship between the grinding positions and the jacking forces, a deflection adjusting method was proposed to realize the grinding processes of step wires and taper wires. In a selfassembled grinding platform, machine visual was taken as measurement method, fixedposition grinding and sweeping grinding experiments were conducted. The results of fixedposition grinding show that the wire profile in grinding area is parabolic after grinding. Shape evolution of wires suggests that the pressure distribution on contact area is parabolic initially and tends to be uniformed as the grinding goes on. The wire deflection has a critical impact on the material removal rate and the shape of the parabola. The results of the sweeping grinding show that step and taper wires may be obtained with different deflection adjusting parameters.

Key words: wire microgrinding, contact pressure, visual measurement;Contour shaping

摘要： 为实现细丝局部微加工，提出了一种新的细丝磨削方式。对磨削过程细丝弯曲进行受力分析，导出了磨具对细丝的顶压力计算公式，并分别建立了磨具与细丝接触区内的压力分布和磨粒切削深度分布模型；根据磨削位置与顶压力的关系，提出挠度调整方式来实现阶梯丝和锥度丝的磨削。在自制的磨削设备上，用机器视觉作为测量方法，进行细丝定点磨削和扫动磨削实验。定点磨削实验表明，细丝磨削后的轮廓为抛物线，其轮廓变化规律表明，磨削初期，接触区内压力呈抛物线分布，之后逐渐趋于均匀分布，而细丝挠度对材料去除率和抛物线形状起决定作用。扫动磨削实验表明，控制挠度调整的参数，设备可加工圆滑过渡的阶梯丝和锥度丝。

关键词: 细丝微磨削, 接触压力, 视觉测量, 轮廓成形