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电火花加工硬质合金模具的研究 总被引:2,自引:0,他引:2
胡黄卿 《稀有金属与硬质合金》2000,(1):9-14
对电火花加工硬质合金模具的电参数选择进行了实验研究,对工具电极材料和尺寸计算进行了探讨,分析了影响电火花加工的因素和电火花加工对硬质合金模具寿命的影响,简述了葬送3复杂的工具电极加工应用CAD/CAM来完成和复杂表腔的模具可采用数控电火花加工。 相似文献
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钨电极加工变形组织研究 总被引:1,自引:0,他引:1
对钍钨电极、单元稀土钨电极和多元稀土钨电极的3个典型状态(再结晶退火态、202旋锻、成品)的显微组织进行观察,探讨钨电极在加工过程中组织演变规律。结果表明:在加工过程中,三种电极显微组织均随加工程度的增加逐步纤维化,但第二相的行为却各有特点。钍钨电极第二相颗粒细小,变形能力较差;单元稀土钨电极的第二相颗粒略大,变形能力较强;多元稀土钨电极第二相颗粒最大,变形能力差。在现有的工艺条件下,钍钨电极和单元稀土钨电极的加工性能优于多元稀土钨电极,第二相尺寸大小和变形能力对钨电极的加工性能具有重要影响。 相似文献
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对碳纤维复合材料的超声辅助磨削工艺特性进行试验研究,首先进行超声振幅与工件表面质量影响关系的单因素试验,然后对工具粒度、进给速度、磨削深度和主轴转速与工件表面质量的影响关系进行正交试验分析,最后对优化的加工参数进行试验验证。采用优化的工艺参数组合进行树脂基碳纤维复合材料加工,显著提高了工件的表面质量。 相似文献
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本文阐述了电蚀加工用易切削电极材料的研制。该种新型电极材料具有良好的强度、硬度,较高的软化温度,优良的切削加工性,均大大优于紫铜电极材料。 相似文献
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以炭/炭复合材料飞机机轮刹车盘为例,介绍了冼俄复合材料坯体的组成及机械特性、表面质量要求。根据该材料的特性和产品要求。制定了产品最终机加工磨削加工方案。同时,采用周边固定法。对工件的受力情况作了分析,对用此种固定法磨削加工的产品质量作了评价,结果表明,此种磨削工艺完全满足生产的要求。 相似文献
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Electrical discharge machining (EDM) is a well-established machining option for manufacturing geometrically complex or hard material parts that are extremely difficult-to-machine by conventional machining processes. In this research work, investigations were carried out on the machining of AISI D2 tool steel under conventional EDM and cryogenically cooled EDM process (CCEDM). The input process parameter such as current (Ip), pulse on time (Ton) and gap voltage (V) were investigated and the output responses like electrode wear ratio, metal removal rate and surface roughness were explored. Experiments were conducted using L18 orthogonal array in EDM machine. Experimental results showed reductions in the electrode wear of 16% over CCEDM process. A grey relational analysis was used to solve the EDM process with multi performance characteristics to optimize EDM parameters. 相似文献
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浅谈如何提高机械加工精度 总被引:2,自引:0,他引:2
在机械加工过程中,如何减少各种因素对加工精度的影响,如何使工件达到质量要求,就成为加工前必须要考虑的事情,也就是要对影响机械加工精度的因素进行分析。 相似文献
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现如今,我国机械加工行业在不断发展,市场对零件加工精度的要求也在不断提高。为了满足各类市场需求,要提升加工工艺,了解影响零件精度的主要原因,并采取有效的误差控制措施,进而出产更多合格产品。本文主要就机械加工工艺对金属零件加工精度的影响进行了相关的阐述和分析。 相似文献
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D. D. Himbeault R. A. Varin K. Piekarski 《Metallurgical and Materials Transactions A》1988,19(8):2109-2113
An attempt was made to coat graphite fibers with tungsten carbide. Solid and liquid copper were used as a diffusion medium
for tungsten to migrate to the surface of the graphite fibers at elevated temperature to form carbides. It was found that
it is possible to electroplate Cu-1 pct W alloy on graphite fibers. It was established that this alloy contained tungsten
in atomic dispersion. It was fur-ther discovered that tungsten was not in an equilibrium condition in copper and upon heat
treatment formed fine precipitates instead of diffusing to the surface of the fiber to form tungsten carbide. However, it
was also found that tungsten has a certain solubility in liquid copper and thus it was possible to obtain carbide coatings
on graphite fibers by using liquid copper as a transfer agent for tungsten. 相似文献
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薄壁铝筒零件由于壁薄、刚性差,加工中容易出现变形、振刀现象,加工质量难以保证。本文通过对零件夹具进行优化设计,满足了零件设计要求,为薄壁类零件的加工提供了一种可靠方法。 相似文献
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对碳纤维复合材料超声辅助磨削表面质量进行工艺试验研究,分析复合材料表面质量评价方法,在不同加工参数下进行磨削试验,研究超声辅助磨削的去除机理和碎屑形貌.结果表明:超声辅助磨削比普通磨削加工工件的表面粗糙度值降低约10%~30%,同时超声辅助磨削形成的加工表面更加平整,一致性更好,更容易形成好的表面质量. 相似文献
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简介计算机辅助设计和数控加工等数字技术在机械制造中的应用。金隆铜业有限公司是国内大型中外合资铜冶炼企业,其生产技术、生产设备在国内铜冶炼行业都处于领先地位,大量运用先进的数字化技术加工、制作设备备件,在提高了备件的精确度和加工周期的同时,通过改善加工方式大幅提升了备件质量,降低了备件费用。并利用数字化技术为部分重点设备建立了数字化图纸档案,为今后的零部件制作、设备升级改造等工作提供了数字化保证。 相似文献
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Bülent Ekmekci Oktay Elkoca Abdulkadir Erden 《Metallurgical and Materials Transactions B》2005,36(1):117-124
The violent nature of the electric discharge machining (EDM) process leads to a unique structure on the surface of a machined
part. In this study, the influence of electrode material and type of dielectric liquid on the surface integrity of plastic
mold steel samples is investigated. The results have shown that regardless of the tool electrode and the dielectric liquid,
the white layer is formed on machined surfaces. This layer is composed of cementite (Fe3C) and martensite distributed in retained austenite matrix forming dendritic structures, due to rapid solidification of the
molten metal, if carbon-based dielectric liquid is used. The intensity of cracking increases at high pulse durations and low
pulse currents. Cracks on the EDM surfaces have been found to follow the pitting arrangements with closed loops and to cross
perpendicularly with radial cracks and continue to propagate when another discharge takes place in the neighborhood. The amount
of retained austenite phase and the intensity of microcracks have found to be much less in the white layer of the samples
machined in de-ionized water dielectric liquid. The number of globule appendages attached to the surface increased when a
carbon-based tool electrode material or a dielectric liquid was used during machining. 相似文献