共查询到18条相似文献,搜索用时 156 毫秒
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针对TC4钛合金切削加工过程中刀具易磨损、加工效率低等问题,以干冰为冷却媒介对TC4钛合金进行大进给铣削加工,以提高TC4钛合金的切削加工效率,降低刀具磨损。研究了不同冷却方式下的TC4钛合金大进给铣削过程中铣削速度对刀具耐用度的影响规律和干冰低温冷却方式下刀刃形状和刀具材质对刀具耐用度的影响;分析了干冰低温冷却方式下的不同铣刀刀具的磨损特征,明晰了干冰低温冷却大进给铣削TC4钛合金时的刀具磨损机理。研究结果表明,干冰低温冷却可以抑制大进给铣削时的刀具磨损,提高刀具耐用度。此外,圆弧刃三角形刀片比四边形刀片更适合高速大进给铣削。 相似文献
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钛合金是一种难加工材料,主要是因切削区温升过高,刀具磨损严重,影响加工表面质量。为了降低切削区温度,提高钛合金的高速切削加工性,采用低温喷雾射流冷却技术,对TC4进行高速铣削加工性能试验。结果表明:相对于低温冷风和MQL,低温喷雾射流冷却具有更强的导热冷却作用,能有效地降低切削温度、减少刀具磨损、改善加工表面粗糙度及切削加工性。用水作为喷雾冷却介质,无毒害作用,是一种绿色制造技术,具有良好的发展前景。 相似文献
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为了有效降低切削区温度,提高TC4的高速切削加工性,采用低温喷雾射流冷却技术,对TC4高速铣削加工性能进行试验。结果表明:相对于低温冷风和MQL,低温喷雾射流冷却具有更强的导热冷却作用,能有效地降低切削温度、减少刀具磨损、减小加工表面粗糙度值,改善切削加工性。由于用水作为喷雾冷却介质,无毒害作用,是一种绿色制造技术,具有良好的发展前景。 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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低温氮气射流对钛合金高速铣削加工性能的影响 总被引:7,自引:0,他引:7
在钛合金的高速切削过程中,切削区温度很高,加速了刀具的磨损,限制了切削速度的进一步提高。为降低切削区温度、防止刀具的氧化磨损,提出在低温氮气射流条件下进行钛合金的高速铣削加工。在干铣削、浇注切削液、常温氮气油雾、低温氮气射流和低温氮气射流结合微量润滑等冷却润滑条件下进行了钛合金的高速铣削对比试验。试验结果表明,低温氮气射流结合微量润滑能够最有效地降低铣削力,抑制刀具磨损。借助扫描电镜的检测手段,研究了不同冷却润滑条件下刀具的失效形式。指出在低温氮气射流条件下高速铣削钛合金时,只要热裂纹的形成与扩展未引起刀具的崩刃及刀面的剥落,进一步降低低温氮气的温度将提高刀具的使用寿命。 相似文献
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钛合金是一种典型的难加工材料,其热传导率低,切削过程温升大而易加剧刀具磨损。本文通过对TC4钛合金的车削试验,研究了在干切削和复合喷雾冷却条件下切削温度随切削速度、切削深度和进给量的变化情况。结果表明:切削温度随着切削速度、切削深度和进给量的增大而增大;采用复合喷雾冷却技术可在TC4钛合金车削过程中取得较好的冷却效果,切削温度明显低于干切削条件下的切削温度。 相似文献
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AbstractFor titanium alloy at high cutting speed, the severe tool wear will ineluctably take place diminishing the available tool life because of the high instantaneous temperature rise. Especially the WC-Co material in carbide tool will be reacted with the oxygen element in the air and generate oxide, and the tool oxidation wear is inevitable. In milling Ti–6Al–4V alloy operations, this article presents the first comprehensive investigation on the oxidation wear effect of cryogenic cooling on carbide tool compared with the conventional cooling. Based on the Gibbs free energy of the chemical reaction, the machining characteristics of the oxidation reactions were analyzed in detail. A series of machining testes were executed adopting controllable cryogenic cooling milling system. The surface and cross-section morphology and phase composition characteristics of tool were measured by SEM and XRD measuring equipments, as well as the oxidation wear mechanism of tool in cryogenic cooling. The results show that the thermal oxidation degree of the elements of WC-Co is higher in the conventional cooling processing. After cryogenic cooling intervention, oxidation reactions in tool are reduced significantly. Even the most probable reaction is disappeared, and the oxidation degree is decreased. When the temperature drops to 180 K, it has the best cooling effect. In cryogenic, the effective binding of WC crystal particle to the adhesive phase Co is a major factor for inhabiting oxidation wear of tool. The investigations indicate that the cryogenic cooling method can effectively inhibit the oxidation effect of carbide tool in milling titanium alloy process, and it improves the resist oxidation ability of tool. 相似文献
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将低温喷雾射流冷却技术应用到TC4钛合金的车削加工中,以纯净水和低温气体的喷雾射流为冷却介质的冷却技术,与低温冷风和常规浇注两种冷却方式在相同实验条件下进行对比.试验结果表明,低温喷雾射流的冷却效果优于低温冷风和常规浇注冷却下的冷却效果,这对于改善钛合金等难加工材料的切削性能有着重要的意义. 相似文献
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Qi Shi Liang Li Ning He Wei Zhao Xiaoli Liu 《The International Journal of Advanced Manufacturing Technology》2013,64(1-4):49-54
In this paper, a number of experiments were carried out to study the machinability of a new damage-tolerant titanium alloy (TC21). Firstly, the effects of milling parameters, tool material, and tool wear on cutting forces were investigated. Secondly, the effects of milling parameters and tool wear on cutting temperature were studied. Finally, the effect of tool material on tool life was explored. Results showed that cutting force, cutting temperature, and tool life were greatly influenced by milling parameters, tool material, and tool wear. Thus, cutting tool matching with proper milling parameters should be carefully chosen to satisfying the tool life in actual production. 相似文献
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Muhammad Jamil Ning He Liang Li Asif Iqbal Mozammel Mia 《Machining Science and Technology》2013,17(6):1022-1046
AbstractTitanium, a difficult-to-cut material, consumes higher time and cost in removing material by machining to produce parts. Machining of Ti alloys has got serious attention owing to its reactive nature with tool materials at elevated temperature that aggravates tool wear. Reportedly, effective and efficient cooling and lubrication at the tool–work interface can ameliorate the machinability of Ti-alloys. In this perspective, this article interrogates the underlying mechanism of critical responses such as surface roughness, temperature, tool life and machining cost under dry, minimum quantity lubrication (MQL) and cryogenic liquid nitrogen (LN2) modes. The effect of cutting speeds and feed rates on such responses have been considered as a function of cooling strategy to standardize the cooling technique as the best alternative for machining. Cryogenic cooling seems to be preponderant regarding machining cost, temperature, surface roughness and tool life in hard turning of a–b titanium alloy. The feasibility of cryogenic cooling was investigated using the iso-response technique in comparison with dry and MQL-assisted hard turning. Experimental results revealed longer tool life and lower machining cost under cryogenic condition followed by MQL and dry machining. Moreover, cryogenic LN2 has been identified as an appropriate alternative to reduce the temperature and surface roughness. On contrary, dry turning evoked a high-temperature and rapid tool wear. In a nutshell, cryogenic assisted hard turning has acceded as a sustainable strategy from an environmental and economic perspective. 相似文献