共查询到18条相似文献,搜索用时 125 毫秒
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为了研究冷却润滑条件及切削参数对TC4钛合金的切削力和表面粗糙度的影响,分别开展CMQL、冷风、浇注式冷却润滑条件的TC4钛合金高速切削实验、四种不同润滑环境的粗/半精/精加工实验以及CMQL条件下TC4钛合金正交切削试验,通过单因素分析和正交试验法研究冷却润滑条件及切削参数对切削加工性的影响。研究表明:CMQL冷却润滑条件可在TC4钛合金高速切削时有效降低切削阻力和改善表面粗糙度,并在高速精车削阶段体现出降低切削阻力的优势。考虑CMQL条件下高速精车TC4钛合金加工效率,最佳参数组合为较高的切削速度、较小的精加工余量和合适范围内较大的进给量。 相似文献
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《机械制造与自动化》2017,(6)
为了减少试验次数、提高效率,通过建立基于JC材料本构模型和绝热剪切失效准则的二维切削仿真模型,运用有限元ABAQUS软件在试验前对钛合金TC4进行高速切削模拟。对比均匀和正交两种设计方法在揭示切削参数对表面粗糙度影响规律中的优缺点,为试验研究优选一种设计方法,同时也揭示仿真中切削速度、进给量和轴向切削深度3个切削参数在高速切削条件下对表面粗糙度的影响规律,为试验加工研究切削参数对表面粗糙度的影响规律奠定基础。 相似文献
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通过响应面分析法(RSM)对超声振动辅助金刚石线锯切割SiC单晶体的工艺参数进行分析和优化。采用中心组合设计实验,考察线锯速度、工件进给速度、工件转速和超声波振幅这4个因素对SiC单晶片表面粗糙度值的影响,建立了SiC单晶片表面粗糙度的响应模型,进行响应面分析,采用满意度函数(DFM)确定了切割SiC单晶体的最佳工艺参数,验证试验表明该模型能实现相应的硬脆材料切割过程的表面粗糙度预测。 相似文献
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□ This article presents a method for machining micro-flow channels on dies for precise and effective mass production of metallic bipolar plates of proton exchange membrane fuel cells (PEMFCs). To find an effective method for machining micro-flow channels on dies of metallic bipolar plates, machining experiments are conducted on micro-flow channels using a micro-scale milling process under various machining conditions. Machining variables are axial depth of cut, feed per tooth, supply/non-supply of cold wind, and single-tool/multi-tool cutting processes. The machining process is monitored by acquiring cutting force signals and acoustic emission signals while conducting the experiments. Surface conditions of machined micro-flow channels are analyzed. In this study, a cold-wind process is better than other processes in terms of burr generation and surface roughness. A cold-wind process with multi-tool process has a particularly better surface quality than the other processes. 相似文献
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车床利用不同类型的刀具加工回转体外表面 ,刀具移动的速度和主轴转动的速度是影响转体表面加工精度和粗糙度的主要因素。即使在正常控制状态下 ,零件表面仍然出现异常波纹。分析和判断异常波纹的产生原理 ,就可有效地排除异常波纹 ,从而保障加工零件的表面粗糙度 相似文献
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Burnishing is a cold working surface treatment process in which plastic deformation of surface irregularities occurs by exerting pressure through a very hard and a very smooth roller or ball on a surface to generate a uniform and work‐hardened surface. This treatment occurs generally after the machining process. In this study, a new combined machining/burnishing tool is designed and is fabricated. This tool allows for generating simultaneously the machining (turning) and the burnishing of the cylindrical surface using a turning machine. First, turned surfaces at different conditions, sketches, finishing and half finishing were performed using only the cutting tool. The evolutions of a surface roughness parameter and the technological time relative to every test condition have been investigated. Second, using the combined machining/burnishing tool at coarse conditions, the evolutions of the surface roughness and the technological time have been also investigated. A comparison among the parameters obtained under different machining conditions and those obtained using the combined machining/burnishing tool has been carried out. Moreover, the analyses of the layers obtained on the combined machined/burnished surface have shown that the burnishing process induces compressive residual stresses on the subsurface treated specimens. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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针对钛合金难加工特点,将液氮作为冷却介质直接喷向切削区进行钛合金TC4低温车削加工,测量其切削力、表面粗糙度和刀具磨损,并与干切削在相同实验条件下对比,分析低温切削对钛合金的影响。实验结果表明:低温切削钛合金,主切削力有所增大,但进给方向力减小,刀具磨损状况与表面质量得到改善,断屑相对容易。 相似文献
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针对超声辅助加工在工件表面形成微刻划表面可以提高高强铝合金表面的微结构性能的现象,进行了单激励旋转超声纵扭复合铣削表面微观结构的试验,基于水接触角理论和纵扭铣削运动学理论分析了加工参数对水接触角的影响;搭建了单激励超声纵扭铣削试验平台,采用正交试验法研究了不同加工参数对表面粗糙度、铣削力以及表面润湿性能的影响。结果表明:超声振幅为4μm时表面质量最佳,切削速度和进给量与表面粗糙度和水接触角呈正相关的关系;超声加工方式下的表面水接触角较普通方式更大,而在超声加工时低振幅加工比高振幅加工的表面水接触角大,当转速达到一定值时,高振幅和低振幅所加工的表面水接触角差别不大。合适的加工参数条件下超声纵扭加工方式可以降低加工表面的粗糙度,改变表面的润湿性。 相似文献
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Application of Taguchi and response surface methodologies for surface roughness in machining glass fiber reinforced plastics by PCD tooling 总被引:1,自引:1,他引:0
This paper discusses the use of Taguchi and response surface methodologies for minimizing the surface roughness in machining
glass fiber reinforced (GFRP) plastics with a polycrystalline diamond (PCD) tool. The experiments have been conducted using
Taguchi’s experimental design technique. The cutting parameters used are cutting speed, feed and depth of cut. The effect
of cutting parameters on surface roughness is evaluated and the optimum cutting condition for minimizing the surface roughness
is determined. A second-order model has been established between the cutting parameters and surface roughness using response
surface methodology. The experimental results reveal that the most significant machining parameter for surface roughness is
feed followed by cutting speed. The predicted values and measured values are fairly close, which indicates that the developed
model can be effectively used to predict the surface roughness in the machining of GFRP composites. The predicted values are
confirmed by using validation experiments. 相似文献