本文選題：電解加工 + 電液束　； 參考：《大連理工大學(xué)》2015年碩士論文

【摘要】：電液束加工是利用噴射電解液作為“陰極化”的工具,沖擊加工區(qū)域,使金屬發(fā)生陽(yáng)極溶解而被去除。電液束加工適合加工尺度在0.1 mm～1.0mm的微結(jié)構(gòu),并得到廣泛應(yīng)用。論文在總結(jié)了微小孔的加工方法、微小孔再鑄層去除方法及電液束加工技術(shù)的基礎(chǔ)上,建立了電液束加工去除微小孔再鑄層的裝置,分析了電液束加工去除微小孔再鑄層時(shí),其加工區(qū)域的流場(chǎng)和電場(chǎng)分布特性,開(kāi)展了各加工參數(shù)對(duì)去除3J21合金、GH4169高溫合金的微小孔再鑄層的影響規(guī)律試驗(yàn),主要工作內(nèi)容如下：基于三軸數(shù)控平臺(tái)搭建了電液束加工微小孔再鑄層的試驗(yàn)裝置,主要設(shè)計(jì)了供液過(guò)濾循環(huán)系統(tǒng)、噴射系統(tǒng)、保壓夾具裝置及對(duì)刀裝置。設(shè)計(jì)輔助對(duì)刀電極的干對(duì)刀裝置,以保證電液束加工去除微小孔試驗(yàn)具有較高的對(duì)刀精度。運(yùn)用仿真軟件對(duì)電液束加工的噴嘴射流的特性進(jìn)行了分析,研究了不同長(zhǎng)徑比結(jié)構(gòu)噴嘴的軸線上射流的速度情況,優(yōu)化設(shè)計(jì)合理的噴嘴結(jié)構(gòu)；對(duì)加工區(qū)域的流場(chǎng)分布進(jìn)行仿真,并分析電液束加工區(qū)域的電場(chǎng)分布特性,優(yōu)化選擇合適的加工條件。通過(guò)電液束加工去除微小孔再鑄層試驗(yàn),重點(diǎn)研究了噴嘴口徑、加工電壓、電解液壓力、加工間隙和電解液組分對(duì)再鑄層去除的影響規(guī)律,通過(guò)試驗(yàn)分析,加工3J21合金時(shí)較優(yōu)的加工工藝參數(shù)為：加工電壓為300 V左右,電解液壓力為0.3 MPa,加工間隙為0mm。開(kāi)展了高溫合金GH4169電火花加工微小孔再鑄層的去除試驗(yàn),得到較優(yōu)加工工藝參數(shù)為：加工電壓為200V左右,電解液壓力為0.4MPa,加工間隙為0mm。分析了電火花再鑄層去除后的孔壁質(zhì)量,結(jié)果顯示,通過(guò)電液束加工去除微小孔再鑄層,可明顯去除微小孔內(nèi)的再鑄層,并提高其表面質(zhì)量。上述研究證明,采用電液束加工法去除微小孔再鑄層具有可行性。
[Abstract]:Electro-hydraulic beam machining (EHM) is a tool of "cathotization" by jet electrolyte, which impinges the processing area and causes the metal to dissolve and be removed. Electro-hydraulic beam machining is suitable for machining microstructures of 0. 1 mm~1.0mm and is widely used. On the basis of summarizing the machining method of micro-hole, the removal method of micro-hole re-casting layer and the technology of electro-hydraulic beam machining, a device for removing micro-hole re-casting layer by electro-hydraulic beam machining is established, and the removal of micro-hole re-casting layer by electro-hydraulic beam machining is analyzed. The characteristics of flow field and electric field distribution in the machining area were studied. The effect of various processing parameters on the micropore recasting layer of 3J21 alloy GGH4169 superalloy was studied. The main work is as follows: based on the three-axis numerical control platform, the test device of electro-hydraulic beam machining micro-hole recasting layer is built, and the liquid supply filter circulation system, jet system, pressure holding fixture and cutter adjusting device are designed. In order to ensure the high precision of machining and removing tiny holes by electro-hydraulic beam, a dry tool alignment device with auxiliary tool electrode was designed. The characteristics of nozzle jet produced by electro hydraulic beam are analyzed by using simulation software. The velocity of jet on the axis of nozzle with different aspect ratio is studied, the reasonable nozzle structure is optimized and the flow field distribution in machining area is simulated. The electric field distribution in the electrohydraulic beam machining area is analyzed, and the suitable processing conditions are optimized. The influence of nozzle diameter, machining voltage, electrolyte pressure, machining gap and electrolyte composition on the removal of recast layer was studied by electrohydraulic beam machining. The optimum processing parameters of 3J21 alloy are as follows: the processing voltage is about 300V, the electrolyte pressure is 0.3 MPA, and the machining gap is 0 mm. The removal test of micro-hole recast layer in GH4169 EDM of superalloy was carried out. The optimum processing parameters were obtained as follows: the processing voltage is about 200V, the electrolyte pressure is 0.4MPa, and the machining gap is 0mmm. The quality of the hole wall after the removal of the EDM layer is analyzed. The results show that the surface quality of the recast layer in the micro-hole can be obviously removed and the surface quality can be improved by the removal of the micro-hole re-cast layer by electro-hydraulic beam machining. The above research proves that it is feasible to remove the recast layer of tiny hole by electrohydraulic beam processing.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG662

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本文編號(hào)：1927979