表面微织构硬质合金对桦木摩擦特性的影响

Effect of surface micro-texture cemented carbide on friction characteristics of birch

微织构是一种改进材料摩擦性能的有效措施。选取桦木为研究对象,在不同载荷和木材含水率条件下,研究了有无织构的硬质合金试样对桦木表面摩擦系数的影响。结果表明,在深度20μm、直径50μm和中心孔间距为150μm的硬质合金表面微织构情况下,其表面的浸润性优于平面,亲水性较强,其表面与桦木间的摩擦系数低于平面与桦木产生的摩擦系数。在木材含水率为40%、载荷为10 N的情况下,平面和微织构的平均摩擦系数分别为0.121和0.043,随着作用载荷的提高,摩擦系数也逐渐提高。合理的微织构形式可以有效降低木材与硬质合金间的摩擦系数。将织构技术应用到木材切削中,可以为木工刀具减磨技术研究提供一条新途径。

Micro-texture is a kind of effective measures to improve material friction performance. Birch（ Betula spp.）was selected as the cutting samples. Under the different loads and wood moisture contents,the influence of cemented carbide sample with or without texture on the friction coefficient of birch surface was studied. The results showed that,when the cutting depth,diameter and center hole spacing of micro-texture were 20 μm,50 μm and 150 μm,respectively,the wettability of the micro-texture surface was better than that of plane surface,with strong hydrophilic property. The coefficient of friction between the micro-texture surface and birch was lower than that between the plane surface and birch. In the case of 40% wood moisture content and 10 N loading,the average friction coefficient of plane and micro-texture was 0.121 and 0.043,respectively. With the increase of working load,the coefficient of friction between the surfaces increased. Reasonable micro-texture form can effectively reduce the friction coefficient between birch and cemented carbide. The friction performance was affected by the wood moisture content,applied load and other factors. The texture technology can be applied to wood cutting,aiming at exploring the mechanism of micro-texture antifriction and providing a newway for antifriction technology in the wood machining.