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首页> 外文期刊>Materials and Manufacturing Processes >Influence of Tool Coating, Tool Material, and Cutting Speed on the Machinability of Low-Leaded Brass Alloys in Turning
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Influence of Tool Coating, Tool Material, and Cutting Speed on the Machinability of Low-Leaded Brass Alloys in Turning

机译：刀具涂层，刀具材料和切削速度对车削低铅黄铜合金的切削性能的影响

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摘要

The influence of tool coating and material on the machinability of low-leaded brass alloys (Pb<0.2%) was analyzed in external turning. Carbide tools with various coatings as well as polycrystalline diamond (PCD) tools were applied. As workpiece materials, three low-leaded brass alloys CuZn38As, CuZn42, and CuZn21Si3P were used. Their machining behavior was compared to the leaded (Pb<3.32%) brass CuZn39Pb3. CuZn38As showed the worst machinability in terms of process forces, chip formation, and workpiece quality. This is due to the high volume fraction of -phase with face-centered cubic lattice structure. The machining problems were reduced by the use of tool coatings, in particular by a diamond-like carbon coating. The latter is characterized by high hardness, diamond-like cubic-crystalline lattice structure, and low chemical affinity to brass, which reduced friction in the secondary shear zone. CuZn42 exhibited an improved machinability compared to CuZn38As due to the lower volume fraction of -phase. The positive influence of the tool coating was similar to CuZn38As. Main machining problem of CuZn21Si3P is tool wear because of the hard silicon-rich -phase. In tool life tests, PCD showed higher performance than uncoated and coated carbide tools due to its high abrasive wear resistance and low adhesion tendency.
机译：在外部车削中分析了工具涂层和材料对低铅黄铜合金（Pb <0.2％）的可切削性的影响。使用了具有各种涂层的硬质合金刀具以及多晶金刚石（PCD）工具。作为工件材料，使用了三种低铅黄铜合金CuZn38As，CuZn42和CuZn21Si3P。将其加工性能与含铅（Pb <3.32％）黄铜CuZn39Pb3进行了比较。 CuZn38As在加工力，切屑形成和工件质量方面表现出最差的切削性。这是由于具有面心立方晶格结构的相的高体积分数。通过使用工具涂层，特别是通过类金刚石碳涂层，减少了加工问题。后者的特点是高硬度，类金刚石立方晶格结构和对黄铜的低化学亲和力，从而减少了次级剪切区的摩擦。由于Cu相的体积分数较低，因此与CuZn38As相比，CuZn42具有改善的可加工性。工具涂层的积极影响与CuZn38As相似。由于硬质富硅相，CuZn21Si3P的主要加工问题是刀具磨损。在刀具寿命测试中，由于PCD具有较高的耐磨性和较低的附着力，因此其性能优于未涂层和涂层的硬质合金刀具。

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