共查询到18条相似文献,搜索用时 121 毫秒
1.
2.
对基于间隙平均电压检测法的放电间隙状态检测进行了理论分析,经Pspice电路仿真模拟电压检测过程,验证了间隙平均电压检测法应用于伺服控制信号电压检测的可行性,并在此基础上,对电火花成型加工脉冲电源电参数的选择提出了几点选择标准。 相似文献
3.
对基于间隙平均电压检测法的放电间隙状态检测进行了理论分析,经Pspice电路仿真模拟电压检测过程,验证了间隙平均电压检测法应用于伺服控制信号电压检测的可行性,并在此基础上,对电火花成型加工脉冲电源电参数的选择提出了几点选择标准. 相似文献
4.
5.
为了解决超短脉冲激光数控加工中激光参数与加工速度等参数不匹配导致的加工宽度与加工深度过大或过小的问题,分别从作用机理推导、加工工艺参数内在规律探寻角度建立了基于激光参数及加工速度表示的加工宽度和加工深度表达式,进而建立超短脉冲激光器加工工艺参数求解模型。在基于UMAC的开放式数控系统基础上,针对加工速度匀速和变速两种情况,分别给出了超短脉冲激光器加工工艺参数自适应及生效的技术方案。通过仿真实验,验证了超短脉冲激光器加工工艺参数求解模型的预测性能,其对数控情境下超短脉冲激光器加工工艺参数自适应的相关研究工作,以及提高加工工艺实验效率、降低成本等均具有参考价值。 相似文献
6.
以电火花磨削蜂窝环(GH3536)为试验对象,设计出L16(44)正交表。采用灰色关联分析方法研究峰值电流、峰值电压、脉冲宽度、脉冲间隔四个主要电加工参数对加工速度的影响关系,基于GM(1,N)多变量灰色模型及人工神经网络原理建立电火花磨削蜂窝环的加工速度预测模型,并在MATLAB环境下进行仿真,得出模型在样本参数范围内的绝对均值误差为0.53%,在样本参数外的绝对均值误差为6.74%。结果表明该模型能映射出电火花磨削蜂窝环的工艺规律并能成功预测出其加工速度,为电火花磨削蜂窝环工艺参数的选择提供了参考和依据,具有实用意义。 相似文献
7.
8.
《制造技术与机床》2018,(12)
快速伺服刀架固有的动态特性是影响面形精度的主要因素,为了定量研究伺服刀架动态性能对面形精度的影响,分析了快速伺服车削特性,提出以系统的观点来进行虚拟加工并给出了快刀虚拟加工流程和参数优化选择流程,伺服刀架的闭环动态辨识模型对于数据模型的响应即为虚拟加工面形。介绍了基于MATLAB的数据模型生成及动态辨识模型获取方法,在此基础上,进行了实例仿真。仿真结果表明:伺服刀架的动态特性使得加工面形存在一定幅值衰减和相位滞后,不同加工参数下的幅值衰减和相位滞后差别较大。定量分析结果有助于加工参数的优化选择,为下一步研究超精密快速车削的工艺优化,以及精密高效加工提供指导和依据。 相似文献
9.
10.
11.
M. Y. Ali A. S. Ong 《The International Journal of Advanced Manufacturing Technology》2006,27(5-6):501-508
In the present research, wire electrical discharge machining (WEDM) of γ titanium aluminide is studied. Selection of optimum
machining parameter combinations for obtaining higher cutting efficiency and accuracy is a challenging task in WEDM due to
the presence of a large number of process variables and complicated stochastic process mechanisms. In general, no perfect
combination exists that can simultaneously result in both the best cutting speed and the best surface finish quality. This
paper presents an attempt to develop an appropriate machining strategy for a maximum process criteria yield. A feed-forward
back-propagation neural network is developed to model the machining process. The three most important parameters – cutting
speed, surface roughness and wire offset – have been considered as measures of the process performance. The model is capable
of predicting the response parameters as a function of six different control parameters, i.e. pulse on time, pulse off time,
peak current, wire tension, dielectric flow rate and servo reference voltage. Experimental results demonstrate that the machining
model is suitable and the optimisation strategy satisfies practical requirements. 相似文献
12.
Silicon carbide (SiC) ceramics have been widely used in modern industry. However, the manufacture of SiC ceramics is not an efficient process. This paper proposes a new technology of machining SiC ceramics with electrical discharge milling and mechanical grinding compound method. The compound process employs the pulse generator used in electrical discharge machining, and uses a water-based emulsion as the machining fluid. It is able to effectively machine a large surface area on SiC ceramics with a good surface quality. In this paper, the effects of pulse duration, pulse interval, peak voltage, peak current and feed rate of the workpiece on the process performance parameters, such as material removal rate, relative electrode wear ratio and surface roughness, have been investigated. A L25 orthogonal array based on Taguchi method is adopted, and the experimental data are statistically evaluated by analysis of variance and stepwise regression. The significant machining parameters, the optimal combination levels of machining parameters, and the mathematical models associated with the process performance are obtained. In addition, the workpiece surface microstructure is examined with a scanning electron microscope and an energy dispersive spectrometer. 相似文献
13.
基于人工神经网络的电火花加工工艺建模方法研究 总被引:3,自引:3,他引:0
电火花加工是一个受多参数影响的复杂随机过程,很难建立一个适当的机理模型。用神经网络技术以铜加工SKD-Ⅱ为例建立了电火花加工工艺模型,并依据工艺样本中各参数数据的不同特点采用了不同的预处理方法,测试表明效果较好,所建模型能精确地预测出给定条件下的加工工艺参数,反映了该机床的加工工艺规律。另外,采用石墨加工SKD-Ⅱ工艺数据验证了该方法的通用性及有效性。 相似文献
14.
Chengrang Li Zhidong Liu Laijiu Fang Hongwei Pan Mingbo Qiu 《The International Journal of Advanced Manufacturing Technology》2018,95(5-8):1805-1818
High-speed wire electrical discharge machining (WEDM-HS) of materials of super-high thickness (more than 1000 mm) is a challenging problem. First, sufficient energy is required to maintain the inter-electrode normal discharge. Next, there must be adequate inter-electrode dielectric fluid. Third, in order to generate a smooth cut surface, it is necessary to suppress the vibration of the wire electrode to reduce vibration lines on the cutting surface. To better understand these challenges, the energy and the flow of the medium between two electrodes were analyzed, allowing the establishment of a relevant model. The results indicated that for super-high-thickness machining, the pulse energy must be adequate to compensate for the energy consumed in the molybdenum wire and inter-electrode working liquid. In addition, the running speed of the wire electrode should be improved to ensure that there is a sufficiently high flow rate of the dielectric fluid. The servo control mode of the existing machine tools and dielectric fluid were improved and then a process experiment was performed. The experimental results show that the process can be carried out efficiently and stably and the workpiece surface can be cut smoothly using the improved working liquid and servo control mode. 相似文献
15.
16.
L. Tang Y. F. Guo 《The International Journal of Advanced Manufacturing Technology》2014,70(5-8):1369-1376
S-03 is a novel special stainless steel, which is widely used in precision aerospace parts and electrical discharge machining technology has the merit of high-accuracy machining. This paper aims to combine gray relational analysis and orthogonal experimental to optimize electrical discharge high-accuracy machining parameters. The four process parameters of gap voltage, peak discharge current, pulse width, and pulse interval are required to optimize in the fewest experiment times. The material removal rate and surface roughness are the objective parameters. The experiment were carried out based on Taguchi L9 orthogonal array, then we carried out the gray relational analysis to optimize the multi-objective machining parameter, finally, we verified the results through a confirmation experiment. The sequence of machining parameters from primary to secondary are as follows: discharge current 7A, pulse interval 100 μs, pulse width 50 μs, and gap voltage 70 V. Using the above machining parameters, we can obtain good surface roughness Ra1.7 μm, and material removal rate 13.3 mm3/min. The machined work piece almost has no surface modification layer. The results show that combining orthogonal experiment and gray relational analysis can further optimize machining parameters, the material removal rate increased by 23.8 %, and the surface roughness almost has no change. 相似文献
17.
Ko-Ta Chiang 《The International Journal of Advanced Manufacturing Technology》2008,37(5-6):523-533
Electric discharge machining (EDM) has achieved remarkable success in the manufacture of conductive ceramic materials for
the modern metal industry. Mathematical models are proposed for the modeling and analysis of the effects of machining parameters
on the performance characteristics in the EDM process of Al2O3+TiC mixed ceramic which are developed using the response surface methodology (RSM) to explain the influences of four machining
parameters (the discharge current, pulse on time, duty factor and open discharge voltage) on the performance characteristics
of the material removal rate (MRR), electrode wear ratio (EWR), and surface roughness (SR). The experiment plan adopts the
centered central composite design (CCD). The separable influence of individual machining parameters and the interaction between
these parameters are also investigated by using analysis of variance (ANOVA). This study highlights the development of mathematical
models for investigating the influences of machining parameters on performance characteristics and the proposed mathematical
models in this study have proven to fit and predict values of performance characteristics close to those readings recorded
experimentally with a 95% confidence interval. Results show that the main two significant factors on the value of the material
removal rate (MRR) are the discharge current and the duty factor. The discharge current and the pulse on time also have statistical
significance on both the value of the electrode wear ratio (EWR) and the surface roughness (SR). 相似文献
18.
Fuzhu Han Jun Jiang Dingwen Yu 《The International Journal of Advanced Manufacturing Technology》2007,34(5-6):538-546
Surface roughness is significant to the finish cut of wire electrical discharge machining (WEDM). This paper describes the
influence of the machining parameters (including pulse duration, discharge current, sustained pulse time, pulse interval time,
polarity effect, material and dielectric) on surface roughness in the finish cut of WEDM. Experiments proved that the surface
roughness can be improved by decreasing both pulse duration and discharge current. When the pulse energy per discharge is
constant, short pulses and long pulses will result in the same surface roughness but dissimilar surface morphology and different
material removal rates. The removal rate when a short pulse duration is used is much higher than when the pulse duration is
long. Moreover, from the single discharge experiments, we found that a long pulse duration combined with a low peak value
could not produce craters on the workpiece surface any more when the pulse energy was reduced to a certain value. However,
the condition of short pulse duration with high peak value still could produce clear craters on the workpiece surface. This
indicates that a short pulse duration combined with a high peak value can generate better surface roughness, which cannot
be achieved with long pulses. In the study, it was also found that reversed polarity machining with the appropriate pulse
energy can improve the machined surface roughness somewhat better compared with normal polarity in finish machining, but some
copper from the wire electrode is accreted on the machined surface. 相似文献