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刀具涂层原理及可行性分析

发布时间:2013-08-08

   根据金属切削原理,在正常切削时,刀具的磨损主要包括以下几种:后刀面磨损;前刀面磨损,即月牙洼磨损;前后刀面同时磨损。

    刀具涂层是指在强度和韧性较好的硬质合金或高速钢(HSS)基体表面上,利用气相沉积方法涂覆一薄层耐磨性好的难熔金属或非金属化合物,涂层作为一个化学屏障和热屏障,减少了刀具与工件间的扩散和化学反应,从而减少了月牙洼磨损。涂层刀具具有表面硬度高、耐磨性好、化学性能稳定、耐热耐氧化、摩擦因数小和热导率低等特性。如图为欧瑞康巴尔查斯(OerlikonBalzers)所做的涂层刀具与未涂层刀具的切削状况示意图。  

    未涂层刀具与涂层刀具切削微观示意图

    未涂层刀具,因摩擦系数大等原因存在严重的积屑瘤

涂层后的刀具,摩擦系数小,无明显积屑瘤

    物理气相沉积(PVD)是一种物理气相反应生长法。沉积过程是在真空或低气压气体放电条件下,即在低温等离子体中进行的。涂层的物质源是固态物质,经过“蒸发或溅射”后,在工件表面生成与基材性能完全不同的新的固态物质涂层。PVD涂层材料主要为TiN,TiCN,CrN,TiAlN,AlTiN,AlCrN,WC/C,DLC和金刚石等成份,不同的应用领域,需选用不同的涂层材料。涂层的厚度通常只有几个微米,硬度却是钢铁的2到5倍。欧瑞康巴尔查斯(OerlikonBalzers)涂层公司发明了用铬元素取代钛元素的涂层技术,并于2004年推出了商品名为“BalinitAlcorna”的单层AlCrN涂层。AlCrN涂层的高红硬性使其在极高的热负荷下仍可保持性能稳定,在高速切削、干式(或准干式)切削加工条件应用试验证明性能优异,涂层的高硬度和抗磨损性使得可切削材料硬度达到HRC70。

    贯通轴产品材料为49CrMo4,热处理技术要求为:感应淬火效硬化层深度5-7mm,表面硬度50-55HRC,心部为调质组织,硬度要求35-40HRC。从理论上分析完全可以应用该涂层刀具切削热后贯通轴。

    选用花键滚刀,在经欧瑞康巴尔查斯(OerlikonBalzers)涂层后,进行工艺试验。工艺方法为:热前磨外圆C—滚花键D——热后C处校直——热后滚花键B,将原滚花键工序转移至热后进行加工。

    在原来切削参数不变(S=250r/minF=13m/min)的情况下,加工噪音明显降低。对加工出产品进行了质量跟踪,将任意抽检10件贯通轴花键跳动及M值变动量,从记录数据可以看出,应用涂层刀具热后滚切贯通轴加工精度完全符合图纸要求,该精度要求可以取消偏离。M值变动量减小后提高了与凸缘装配后侧隙变动量,从而提高了装配精度。



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