發(fā)布時(shí)間：2018-05-29 19:59

  本文選題：鈦合金 + 微細(xì)電火花加工　； 參考：《南京航空航天大學(xué)》2011年碩士論文

【摘要】：本課題來(lái)源于基金項(xiàng)目:NSFC-廣東省聯(lián)合基金重點(diǎn)項(xiàng)目(U0934004)、教育部“新世紀(jì)優(yōu)秀人才支持計(jì)劃”項(xiàng)目(NCET-10-0068)、教育部博士點(diǎn)基金博導(dǎo)類項(xiàng)目(20093218110026)、江蘇省自然科學(xué)基金重點(diǎn)項(xiàng)目(BK2010074)、流體傳動(dòng)及控制國(guó)家重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金項(xiàng)目(GZKF201009)、機(jī)械傳動(dòng)國(guó)家重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金項(xiàng)目(SKLMTKFKT201005)。 本文利用微細(xì)電火花切割技術(shù)和微細(xì)電火花成形技術(shù)在鈦合金表面制備了溝槽、網(wǎng)紋微結(jié)構(gòu);利用激光打標(biāo)技術(shù)在鈦合金表面和超聲電機(jī)定子表面制備了凹坑型陣列;采用增強(qiáng)型磁控陰極電弧鍍膜沉積系統(tǒng)在鈦合金微結(jié)構(gòu)表面分別制備了CrN和DLC薄膜。最后在載荷為3N,滑移速度為0.4m/s時(shí),將微結(jié)構(gòu)表面、微結(jié)構(gòu)/薄膜表面在去離子水環(huán)境下與Si3N4小球?qū)δ?研究其摩擦學(xué)特性。同時(shí)初步研究了制備凹坑微結(jié)構(gòu)的超聲電機(jī)定子表面的摩擦學(xué)特性。本文獲得的主要工作和結(jié)論如下: 一、通過(guò)不同面積率的正方形和菱形微結(jié)構(gòu)的摩擦學(xué)特性研究發(fā)現(xiàn),寬度為0.2mm的正方形和菱形微結(jié)構(gòu)表面在面積率為30%時(shí),顯示出比較好的減摩特性,寬度為0.25mm的正方形和菱形微結(jié)構(gòu)表面在面積率為10%時(shí)顯示出較好的減摩特性。通過(guò)溝槽微結(jié)構(gòu)表面的正交試驗(yàn)可以得出:面積率對(duì)溝槽微結(jié)構(gòu)的摩擦學(xué)特性影響最大,溝槽的深度影響最小。凹坑微結(jié)構(gòu)表面的正交試驗(yàn)結(jié)果表明凹坑的直徑對(duì)摩擦因數(shù)影響最大,而凹坑陣列的面積率是凹坑微結(jié)構(gòu)表面的磨損量和小球磨損率的主要因素。通過(guò)網(wǎng)紋微結(jié)構(gòu)的正交試驗(yàn),可以得出寬度是影響網(wǎng)紋微結(jié)構(gòu)表面的穩(wěn)態(tài)摩擦因數(shù)的主要因素,在網(wǎng)紋角度為45度,間寬比為10時(shí)取得最優(yōu)效果。 二、微結(jié)構(gòu)/CrN薄膜改性表面摩擦因數(shù)的跑合期加長(zhǎng),溝槽、網(wǎng)紋微結(jié)構(gòu)/CrN薄膜改性的穩(wěn)態(tài)摩擦因數(shù)和所對(duì)應(yīng)的小球磨損率都要低于或接近于光滑CrN薄膜表面,而凹坑微結(jié)構(gòu)/CrN薄膜改性表面的穩(wěn)態(tài)摩擦因數(shù)和小球磨損率要高于光滑CrN薄膜表面。溝槽、網(wǎng)紋微結(jié)構(gòu)/DLC薄膜改性表面的摩擦因數(shù)跑合期要比凹坑微結(jié)構(gòu)/DLC薄膜改性表面的要短,隨著滑移距離的增加,三種微結(jié)構(gòu)/DLC薄膜改性表面的穩(wěn)態(tài)摩擦因數(shù)都要低于或接近于光滑DLC薄膜表面,摩擦因數(shù)隨著微結(jié)構(gòu)寬度的增加而降低。沉積DLC薄膜之后,小球的磨損率相比光滑DLC表面有所增加。 三、在超聲電機(jī)定子頭表面制備了凹坑微結(jié)構(gòu),并通過(guò)試驗(yàn)獲得定轉(zhuǎn)子之間的摩擦學(xué)特性。直徑為0.15mm的凹坑表面的摩擦因數(shù)最低,穩(wěn)態(tài)摩擦因數(shù)在0.45左右,有微結(jié)構(gòu)的表面相對(duì)于光滑表面,磨損量要低一些,直徑為0.15mm的凹坑表面磨損降低了3倍左右。
[Abstract]:This topic comes from the fund project: NSFC- Guangdong Province Joint Foundation key Project U0934004, Ministry of Education "New Century Outstanding Talent support Program" project NCET-10-0068, Ministry of Education Ph.D. Program Ph.D. Program Project 20093218110026, Jiangsu Natural Science Foundation key Project BK2010074. The open fund project of the State key Laboratory for fluid Transmission and Control is GZKF201009, and the State key Laboratory of Mechanical Transmission is SKLMTKFKT201005. In this paper, micro-EDM and micro-EDM are used to fabricate grooves and mesh microstructures on the surface of titanium alloy, laser marking technology is used to fabricate concave array on the surface of titanium alloy and stator of ultrasonic motor. CrN and DLC thin films were deposited on the microstructure of titanium alloy by enhanced magnetron cathode arc deposition system. Finally, when the load is 3N and the slip velocity is 0.4m/s, the tribological properties of the microstructural surface, the microstructure / thin film surface, and the Si3N4 pellet in deionized water environment are studied. At the same time, the tribological characteristics of the stator surface of the ultrasonic motor fabricated with pit microstructures are studied. The main work and conclusions obtained in this paper are as follows: First, by studying the tribological properties of square and diamond microstructures with different area rates, it is found that the square and rhombus microstructures with width of 0.2mm show better antifriction characteristics when the area ratio is 30. The square and rhombic microstructures with a width of 0.25mm show good antifriction properties when the area ratio is 10. The results of orthogonal experiments show that the area ratio has the greatest influence on the tribological properties of the grooves, and the depth of the grooves has the least effect on the tribological properties of the grooves. The results of orthogonal test show that the diameter of the pit has the greatest influence on the friction coefficient, and the area ratio of the concave array is the main factor of the wear rate of the surface and the wear rate of the ball. Through the orthogonal test of the mesh microstructure, it can be concluded that the width is the main factor affecting the steady friction coefficient of the mesh microstructure surface. The optimum effect is obtained when the mesh angle is 45 degrees and the ratio between width and width is 10:00. Secondly, the running time of the surface friction coefficient of the modified CRN film is lengthened, the steady friction coefficient of the modified CRN film and the wear rate of the corresponding ball are all lower than or close to the smooth surface of the CrN film, and the stable friction coefficient of the modified CRN film and the wear rate of the corresponding ball are lower than or close to that of the smooth CrN film surface. On the other hand, the steady friction coefficient and wear rate of the modified surface of crater microstructure / CRN film are higher than that of smooth CrN film. The friction coefficient of the modified surface of the grooves / mesh microstructures / DLC films is shorter than that of the surface modified by the concave microstructures / DLC films, and with the increase of the slip distance, The steady-state friction coefficient of the modified surface of three kinds of microstructures / DLC films is lower than or close to that of smooth DLC films, and the friction coefficient decreases with the increase of microstructure width. After deposition of DLC film, the wear rate of the ball is higher than that of smooth DLC surface. Thirdly, the pit microstructure was prepared on the stator head surface of ultrasonic motor, and the tribological characteristics between stator and rotor were obtained by experiments. The friction coefficient of the pit surface with diameter of 0.15mm is the lowest, the steady friction coefficient is about 0.45, the wear amount of the surface with microstructure is lower than that of the smooth surface, and the wear of the surface of the pit with diameter of 0.15mm is 3 times lower than that of the smooth surface.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH117.1

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