本文選題：TC4鈦合金 + 高速走絲電火花線切割加工　； 參考：《中北大學(xué)》2017年碩士論文

【摘要】：電火花線切割加工是利用電極絲與工件之間的間歇性脈沖放電產(chǎn)生的能量對導(dǎo)電材料進(jìn)行去除的特種加工方法。由于其可加工各種具有復(fù)雜結(jié)構(gòu)、特殊要求的工件和難加工材料,因此被廣泛的應(yīng)用在航天、電子、民用等工業(yè)領(lǐng)域。但隨著科學(xué)技術(shù)的不斷進(jìn)步,對電火花線切割加工的要求也越來越高。將超聲加工與電火花線切割加工結(jié)合起來可以有效地提高加工效率、表面質(zhì)量,被國內(nèi)外許多專家學(xué)者關(guān)注。目前的研究大多是把超聲振動(dòng)裝置作用在電極絲上,但存在許多缺點(diǎn),比如:會(huì)影響到電極絲的加工精度;在錐度加工時(shí),超聲振動(dòng)裝置很難作用在電極絲上等,因此本文考慮將超聲振動(dòng)裝置作用在工件上,進(jìn)行試驗(yàn)研究。本文首先采用類比的方法對工件超聲振動(dòng)高速走絲電火花線切割復(fù)合加工進(jìn)行可行性分析,接著對超聲振動(dòng)裝置進(jìn)行設(shè)計(jì),主要對工件和裝置夾具進(jìn)行設(shè)計(jì),并將設(shè)計(jì)加工好的超聲振動(dòng)裝置安裝在DK-7720Z高速走絲電火花線切割機(jī)床上進(jìn)行調(diào)試、校驗(yàn)。其次進(jìn)行了TC4鈦合金常規(guī)高速走絲電火花線切割加工的試驗(yàn)研究,分析了電參數(shù),主要是電流、脈沖寬度、脈沖間隔對表面粗糙度、切割速度的影響順序和上述二個(gè)工藝指標(biāo)的最優(yōu)參數(shù)組。再次對TC4鈦合金進(jìn)行工件超聲振動(dòng)高速走絲電火花線切割復(fù)合加工,采用極差分析、方差分析、信噪比分析對試驗(yàn)數(shù)據(jù)進(jìn)行了研究。接著采用對比試驗(yàn)的方法,在相同工藝條件下,分別研究電極絲切割方向與超聲振動(dòng)方向水平、垂直及工件超聲振動(dòng)與無超聲振動(dòng)對上述兩個(gè)工藝指標(biāo)的影響,分析發(fā)現(xiàn):將超聲振動(dòng)作用在工件上以后,表面粗糙度明顯降低,且電極絲切割方向與超聲振動(dòng)方向水平可以獲得更好的表面粗糙度,而在切割速度方面,僅在某些電參數(shù)下明顯提高。然后就超聲振動(dòng)的引入對高速走絲電火花線切割加工工況的改善進(jìn)行了四個(gè)方面的分析。接著將電參數(shù)保持不變,改變超聲頻率和超聲振幅進(jìn)行了工件超聲振動(dòng)高速走絲電火花線切割復(fù)合加工試驗(yàn),發(fā)現(xiàn)只有加工能量和加工時(shí)間匹配得當(dāng),才可以既降低了表面粗糙度又提高了切割速度。最后基于BP神經(jīng)網(wǎng)絡(luò)對工件超聲振動(dòng)高速走絲電火花線切割復(fù)合加工進(jìn)行工藝預(yù)測模型的建立,通過仿真值與實(shí)際值的對比,驗(yàn)證了工藝預(yù)測模型具有強(qiáng)大的學(xué)習(xí)和泛化能力。
[Abstract]:WEDM is a special processing method for the removal of conductive materials by the energy generated by intermittent pulse discharge between the electrode wire and the workpiece. It is widely used in aerospace, electronic, civil and other industrial fields because of its processing of various complex structures, special requirements and hard working materials. With the continuous progress of science and technology, the demand for EDM machining is becoming higher and higher. Combining ultrasonic machining with EDM can effectively improve the machining efficiency and surface quality, which is concerned by many experts and scholars at home and abroad. Many shortcomings, such as: it will affect the machining precision of electrode wire; in taper machining, the ultrasonic vibration device is difficult to function on the electrode wire. Therefore, this paper consider the ultrasonic vibration device to act on the workpiece and carry out the experimental research. Firstly, the method of analogy is used to the ultrasonic vibration high speed wire EDM composite machining. The feasibility analysis is carried out, then the ultrasonic vibration device is designed, the main workpiece and device fixture are designed, and the designed ultrasonic vibration device is installed on the DK-7720Z high speed wire EDM machine tool, and the test is done. Secondly, the test of the TC4 titanium alloy conventional high speed wire EDM machining is carried out. The analysis of electrical parameters, such as electric parameters, mainly current, pulse width, pulse interval on surface roughness, cutting speed, and the best parameters of the above two technical indexes. The ultrasonic vibration high-speed wire EDM composite machining of TC4 titanium alloy was processed again, and the difference analysis, analysis of variance, and the signal to noise ratio were analyzed. The experimental data are studied. Then, under the same technological conditions, the influence of the direction of electrode wire cutting and the direction of ultrasonic vibration, the ultrasonic vibration of the workpiece and the non ultrasonic vibration on the above two technical indexes are studied under the same technological conditions. The results are as follows: after the ultrasonic vibration is acted on the workpiece, the surface is rough. A better surface roughness can be obtained by the direction of wire cutting and the direction of ultrasonic vibration. In the cutting speed, only some electrical parameters are improved obviously. Then four aspects of the improvement of the working conditions of high speed wire EDM are analyzed with the introduction of ultrasonic vibration. The ultrasonic vibration and ultrasonic vibration of the workpiece are changed and the ultrasonic vibration and ultrasonic vibration of the workpiece are changed. It is found that the surface roughness and the cutting speed can be improved only if the processing energy and the processing time match properly. Finally, the ultrasonic vibration of the workpiece is high speed wire based on the BP neural network. The process prediction model of spark wire cutting is established. Through the comparison of the simulation value and the actual value, it is proved that the process prediction model has a powerful learning and generalization ability.

【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG663;TG484

【參考文獻(xiàn)】

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本文編號：1836472