基于复合喷雾冷却的高速车削GH4169刀具磨损及表面粗糙度的研究
发布时间：2019-03-19 07:53
【摘要】：高温合金具有优良的热强性能、热稳定性、耐腐蚀性和良好的工艺性,是制造火箭发动机热端部件的关键材料,在原子能、能源动力、交通运输、石油化工和海水作业等方面也得到了广泛的应用。同时它也是一种典型的难加工材料,在加工过程中存在切削温度高、加工硬化严重、刀具磨损严重、生产效率低的缺点,在很大程度上制约了高温合金的应用。高速切削技术具有切削力小、工件热变形小、材料去除率高的优点,目前已经应用于高温合金的切削加工中。与传统切削相比,高速切削虽然大幅提高了加工效率,但在实际的加工过程中仍然有很多问题需要解决。其中,切削液的大量使用,不仅提高了生成成本而且对环境的污染严重。因此,寻找一种代替切削液的高效冷却润滑方法是亟待解决的关键问题。为了实现高温合金的绿色、高效制造,本论文采用复合喷雾冷却技术对GH4169高温合金进行高速车削加工,对加工过程中各个参数下的刀具磨损形态进行了分析研究,通过对比试验的方法研究了复合喷雾参数对刀具磨损量的影响规律。采用正交试验的方法研究了主要参数(水量V、油量Q、低温气体温度T)对表面粗糙度的影响。结果表明:采用复合喷雾冷却润滑技术高速切削GH4169时片状剥落是最主要的前刀面磨损形态,后刀面的主要磨损形式是沟槽磨损;随着油量Q的增大,刀具磨损量逐渐减小;随着水量V的增大,刀具磨损量先减小后逐渐增大;随着低温气体温度T的降低,刀具磨损量先逐渐增大后减小;已加工表面粗糙度的值随着油量的增大逐渐减小;随着水量的增大先减小后逐渐增大,其中当水量为25ml/h时,粗糙度的值最小为0.67um;随着低温气体温度的降低先增大后减小,其中当低温气体温度为-55℃时,粗糙度的值最小为0.596um;影响已加工表面粗糙度的主次因素为:低温气体的温度T油量Q水量V;使已加工表面粗糙度的值达到最小的最优参数配合为:油量7ml/h、水量25ml/h、低温气体的温度-55℃;加工过程中有两类纹理产生,与加工过程中刀具磨损和振动的产生有关。
[Abstract]:Superalloys, with excellent thermal properties, thermal stability, corrosion resistance and good technological properties, are the key materials for manufacturing hot-end components of rocket engines in atomic energy, energy power, transportation, and so on. Petrochemical and seawater operations have also been widely used. At the same time, it is also a typical difficult-to-work material, which has the disadvantages of high cutting temperature, serious work hardening, serious tool wear and low production efficiency, which restricts the application of superalloy to a great extent. High-speed cutting technology has the advantages of small cutting force, small hot deformation and high material removal rate, so it has been applied in the cutting of superalloy at present. Compared with traditional cutting, high-speed cutting has greatly improved the machining efficiency, but there are still many problems to be solved in the actual machining process. The mass use of cutting fluid not only increases the production cost, but also pollutes the environment seriously. Therefore, the key problem to be solved is to find an efficient cooling lubrication method instead of cutting fluid. In order to realize the green and high efficiency manufacture of superalloy, the high-speed turning of GH4169 superalloy was carried out by using compound spray cooling technology, and the tool wear morphology under each parameter in the process of machining was analyzed and studied in this paper. The influence of composite spray parameters on tool wear was studied by means of comparative test. The influence of main parameters (water quantity V, oil quantity Q, low temperature gas temperature T) on surface roughness was studied by orthogonal test. The results show that flake spalling is the most important wear form in high speed cutting of GH4169, and groove wear is the main wear form of back tool face, and the wear amount of tool decreases gradually with the increase of oil quantity Q, and the wear loss of cutting tool decreases with the increase of oil quantity Q, and the wear rate of cutting tool decreases with the increase of oil quantity Q. With the increase of water volume V, the tool wear first decreases and then increases gradually, and with the decrease of low temperature gas temperature T, the tool wear first increases and then decreases, and the value of machined surface roughness decreases with the increase of oil quantity. With the increase of water content, the roughness decreases first and then increases gradually. When the water quantity is 25ml/h, the minimum roughness is 0.67um. When the temperature of low temperature gas is-55 鈩，
本文编号：2443329
[Abstract]:Superalloys, with excellent thermal properties, thermal stability, corrosion resistance and good technological properties, are the key materials for manufacturing hot-end components of rocket engines in atomic energy, energy power, transportation, and so on. Petrochemical and seawater operations have also been widely used. At the same time, it is also a typical difficult-to-work material, which has the disadvantages of high cutting temperature, serious work hardening, serious tool wear and low production efficiency, which restricts the application of superalloy to a great extent. High-speed cutting technology has the advantages of small cutting force, small hot deformation and high material removal rate, so it has been applied in the cutting of superalloy at present. Compared with traditional cutting, high-speed cutting has greatly improved the machining efficiency, but there are still many problems to be solved in the actual machining process. The mass use of cutting fluid not only increases the production cost, but also pollutes the environment seriously. Therefore, the key problem to be solved is to find an efficient cooling lubrication method instead of cutting fluid. In order to realize the green and high efficiency manufacture of superalloy, the high-speed turning of GH4169 superalloy was carried out by using compound spray cooling technology, and the tool wear morphology under each parameter in the process of machining was analyzed and studied in this paper. The influence of composite spray parameters on tool wear was studied by means of comparative test. The influence of main parameters (water quantity V, oil quantity Q, low temperature gas temperature T) on surface roughness was studied by orthogonal test. The results show that flake spalling is the most important wear form in high speed cutting of GH4169, and groove wear is the main wear form of back tool face, and the wear amount of tool decreases gradually with the increase of oil quantity Q, and the wear loss of cutting tool decreases with the increase of oil quantity Q, and the wear rate of cutting tool decreases with the increase of oil quantity Q. With the increase of water volume V, the tool wear first decreases and then increases gradually, and with the decrease of low temperature gas temperature T, the tool wear first increases and then decreases, and the value of machined surface roughness decreases with the increase of oil quantity. With the increase of water content, the roughness decreases first and then increases gradually. When the water quantity is 25ml/h, the minimum roughness is 0.67um. When the temperature of low temperature gas is-55 鈩，
本文编号：2443329
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