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综述了硬车削加工中不同超硬刀具材料的物理性能和切削性能,阐述了它们在不同领域应用的特点。指出采用超硬刀具进行硬车削是一种高效、洁净的工艺方法,具有广泛的应用前景。 相似文献
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超硬刀具在加工硬脆难加工材料中的应用 总被引:13,自引:0,他引:13
一、前言某些机器零件采用了难加工材料制造,其中包括一些高硬度的脆性材料。在这个加工领域中,超硬刀具能够发挥很大的作用。除天然金刚石外,人造金刚石在近年来已得到了更为广泛的应用。人造金刚石是以石墨为原料,加入催化剂,经过高温、高压制成单晶金刚石细粉,可用作磨料。再用金刚石细粉加入粘结剂,经过又一次高温、高压工艺,从而可以制成聚晶金刚石刀片或其它制品。用类似的工艺,亦可制成以硬质合金作为基底的金刚石复合刀片(PCD)。另一种最新的方法,是用化学气相沉积(CVD)工艺,在硬质合金或陶瓷刀片上涂覆一层金刚… 相似文献
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李雷 《世界制造技术与装备市场》2004,(4):72-72
由于环保问题越来越受到重视,所以,为满足排污要求和减少能源消耗,人们重新考虑金属切削工艺并更具环保意识。目前出现了旨在减少能源消耗而新开发的产品,主要是减少了刀具接触时问。这包括采用高速、断续切削的刀具替代了连续切削的刀具,如普通车刀。这是因为前者要求较少的切削力和功率。 相似文献
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PCD是指将金刚石微粉(粒度为微米级)与少量的金属粉末(如Co等)混合后在高温(1400℃)、高压(几个GPa)下烧结而成的聚晶体。市场上作为商品供应的PCD复合片,是由0.5~0.7mm厚的聚晶金刚石层在高温高压下使其牢固地和硬质合金衬底结合的一种超硬复合材料。它既具备高硬度、高耐磨性,又兼有硬质 相似文献
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超硬刀具材料的发展与应用 总被引:5,自引:0,他引:5
对立方氮化硼和金刚石等超硬刀具材料的发展过程、种类、性能、制造方法和应用范围作了全面介绍 ,同时介绍了近来发明的新型超硬刀具材料———氮化碳 (CxNy) ,并通过切削试验对几种超硬刀具材料的切削性能进行了比较分析。 相似文献
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超硬刀具材料的发展与应用 总被引:1,自引:0,他引:1
超硬刀具材料是国际上70年代发展起来的一种先进刀具材料,它具有工效高、耐用度大和加工质量好等特点,过去主要用于精加工,近几年来由于改进了人造超硬刀具材料的生产工艺,控制了原料纯度和晶粒尺寸,采用了复合材料等,应用范围日益扩大,除适用于一般精加工和半精加工外,还可用于冲击负荷下粗加工,被国际上公认为可作为90年代提高生产率最有希望的刀具材料之一。本文着重介绍近几年来正在迅速发展的超硬刀具材料的现状及特性,希望对于我国进一步研究和推广这类先进刀具材料有一定参考价值。 相似文献
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超硬刀具在汽车制造中的应用第一汽车集团公司工艺研究所(长春130011)魏德成前言随着我国汽车工业的发展,汽车制造技术日新月异,新材料、新技术及新工艺层出不穷,加工尺寸精度的提高,表面粗糙度的降低以及进口机床刀具国产化等问题都亟待解决。然而,现有普通... 相似文献
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Dry machining of aluminum alloys is known to be one of the most difficult metal cutting operations. The issues involved are that without use of cutting fluids, these materials severely adhere to the tool surface and form a built-up edge due to their low melting point and high ductility, leading to deterioration of the surface integrity of the workpiece and tool failure. To overcome this problem, the present study proposes a novel strategy for removing the adhesion layer from the tool surface and recovering the cutting tool performance without detaching the cutting tool from the machine tool, namely, an on-machine tool resharpening process. To achieve efficient removal of the aluminum adhesion layer from the tool surface, the phenomenon of liquid metal embrittlement (LME), which is defined as a brittle fracture, or loss in ductility, of a ductile material in the presence of a liquid metal is employed. A series of experiments using a WC-Co cemented carbide tool and liquid gallium showed that the newly developed strategy employing LME is highly effective in removing the adhesion layer without damage to the tool substrate and has great potential for addressing the issues related to the dry machining of aluminum alloys. 相似文献
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通过对活塞的外圆面进行数学建模,使其曲面网格化,编制活塞加工专用软件。为了提高精度及效率,应用静压主轴单元及全闭环高频响伺服系统进行控制。 相似文献
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This paper presents experimental results concerning the machinability of the titanium alloy Ti17 with and without high-pressure water jet assistance (HPWJA) using uncoated WC/Co tools. For this purpose, the influence of the cutting speed and the water jet pressure on the evolution of tool wear and cutting forces have been investigated. The cutting speed has been varied between 50 m/min and 100 m/min and the water jet pressure has been varied from 50 bar to 250 bar. The optimum water jet pressure has been determined, leading to an increase in tool life of approximately 9 times. Compared to conventional lubrication, an increase of about 30% in productivity can be obtained. 相似文献
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Elliptical vibration cutting with single-crystalline diamond tools is applied to mirror surface machining of high-alloy steels such as cold work die steels and high-speed tool steels with a hardness of more than 60 HRC. Although practical mirror surface machining of hardened die steels such as Stavax (modified AISI 420) with a hardness of 53 HRC has been realized with the elliptical vibration cutting, lives of single-crystalline diamond tools are not sufficiently long in machining of some high-alloy steels, that may be caused by a large amount of alloy elements. In order to clarify the influence of the alloy elements on the diamond tool damage, the elliptical vibration cutting experiments are conducted on six kinds of high-alloy steels and four kinds of pure metals which are the same as the alloy elements. Mechanical properties of the alloy steels, i.e. difference in hardness between carbides and matrices, and the number of small carbides, are measured, and their influence on the micro-chippings are investigated. The chemical states of the alloy elements in high-alloy steels are analyzed using an X-ray diffraction (XRD) and an electron probe micro analyzer (EPMA), and their influence on the tool wear is discussed. Based on the investigation, a mirror surface machining of DC53, which has a high hardness of 62.2 HRC and the best machinability in the tested high-alloy steels, is demonstrated, and a mirror surface with a roughness of Rt 0.05 μm is obtained successfully. 相似文献
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朱从容 《中国制造业信息化》2001,30(2):65-66
说明了PCBN刀具的性能特点、制造方法和应用领域 ,并介绍了PCBN刀具在淬硬钢、表面硬化合金、冷硬铸铁、珠光体灰口铸铁材料切削加工中的实际应用情况。 相似文献