本文選題：表面織構(gòu) + 溝槽��； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：兩個接觸的物體在發(fā)生相對運動時會引起界面的摩擦磨損,界面的摩擦磨損是影響各種裝備正常安全服役問題的關(guān)鍵要素,有效地調(diào)控界面摩擦及磨損有助于提高設(shè)備運行的可靠性、延長使用壽命以及節(jié)約能源和原材料。界面摩擦磨損受到溫度、濕度、相對滑動速度、表面粗糙度、法向載荷、磨屑顆粒以及表面形貌等諸多因素的影響。表面經(jīng)織構(gòu)化處理后能夠有效地改變表面的幾何形貌,引起了摩擦界面接觸狀態(tài)的變化,從而對界面摩擦學(xué)特性有著重要的影響作用。但是關(guān)于織構(gòu)表面是如何影響界面的摩擦學(xué)特性,即影響機理方面的研究相對較少。因此,開展織構(gòu)表面是如何影響界面的摩擦學(xué)特性的研究工作具有重要的意義,為織構(gòu)表面的優(yōu)化設(shè)計提供了重要的理論依據(jù)。本文在盤試樣表面加工出具有不同寬度的溝槽型織構(gòu)表面和單根溝槽表面試樣,在球-面/面-面兩種不同的接觸模式下首先分別考察了溝槽型織構(gòu)表面對界面摩擦學(xué)特性的影響,然后再利用單根溝槽表面試樣深入研究了溝槽的存在對界面摩擦力學(xué)特性和動態(tài)特性的影響,從而揭示了溝槽型織構(gòu)表面對界面摩擦學(xué)特性的影響機理。主要結(jié)論如下:1、在本研究所選試樣幾何參數(shù)及試驗條件下,無論球-面接觸還是面-面接觸,經(jīng)溝槽織構(gòu)化表面處理的盤試樣均能顯著地改變界面的摩擦學(xué)特性,且特定尺寸參數(shù)的溝槽型織構(gòu)表面能夠在一定程度上降低界面的摩擦系數(shù)。2、溝槽的存在改變了摩擦界面的接觸狀態(tài),從而引起了界面的法向位移和力信號產(chǎn)生突變,且隨著溝槽寬度的增大,溝槽對界面接觸狀態(tài)的影響越明顯,界面法向位移和法向力信號的變化亦越明顯。但接觸方式的不同,溝槽對界面接觸狀態(tài)的影響存在一定的差異:在球-面接觸中,溝槽的存在主要打斷了界面的連續(xù)接觸,從而導(dǎo)致了界面法向位移、力信號的變化;在面-面接觸中,溝槽的存在主要改變了界面的接觸面積,導(dǎo)致界面上接觸應(yīng)力的分布發(fā)生了轉(zhuǎn)移,從而使得界面的力信號發(fā)生變化。3、溝槽棱邊對摩擦界面存在刮擦的作用,能夠起到清理界面磨屑的作用,從而減輕了磨屑對界面的負面影響,進而改善了界面的摩擦學(xué)特性,但具有特定寬度的溝槽型織構(gòu)表面才能有效地改善界面的摩擦學(xué)特性。在球-面接觸中,隨著溝槽寬度增大,溝槽棱邊對摩擦界面的刮擦作用將逐漸演變成強烈的撞擊作用,從而加劇了界面的磨損;在面-面接觸中,隨著溝槽寬度的增大,界面力信號的變化越明顯和溝槽棱邊對界面的刮擦作用越強烈,這可能會加劇對摩副的磨損。因此,需合理的設(shè)計溝槽的尺寸參數(shù),才能充分的發(fā)揮溝槽型織構(gòu)表面對界面的影響作用,進而改善摩擦界面的摩擦學(xué)特性。
[Abstract]:The friction and wear of two contact objects will cause the friction and wear of the interface when they are in relative motion. The friction and wear of the interface is the key factor that affects the normal and safe service of all kinds of equipment. The effective control of interface friction and wear can improve the reliability of the equipment, prolong the service life and save energy and raw materials. Interface friction and wear are affected by temperature humidity relative sliding velocity surface roughness normal load debris particles and surface morphology. After texture treatment, the surface geometry can be changed effectively, which leads to the change of the contact state of the friction interface, which has an important effect on the tribological properties of the interface. However, there are few studies on how the texture surface affects the tribological properties of the interface, that is, the influence mechanism. Therefore, it is of great significance to study how the texture surface affects the tribological properties of the interface, which provides an important theoretical basis for the optimal design of the texture surface. In this paper, grooved texture surfaces with different widths and single grooves surface samples were machined on the surface of disk specimens. The influence of grooved texture surface on the tribological properties of the interface was investigated in two different contact modes. Then, the influence of grooves on the tribological and dynamic properties of the interface was studied by using the single groove surface specimen, and the influence mechanism of the grooved texture surface on the tribological properties of the interface was revealed. The main conclusions are as follows: 1. Under the geometric parameters and experimental conditions, the tribological properties of the interface can be significantly changed by the groove-textured surface treated disk specimen, regardless of the spherical contact or the surface-to-surface contact. And the surface of grooved texture with specific dimension parameters can reduce the friction coefficient of interface to a certain extent. The existence of groove changes the contact state of friction interface, which causes the abrupt change of normal displacement and force signal of interface. With the increase of groove width, the influence of groove on interface contact state is more obvious, and the change of interface normal displacement and normal force signal is more obvious. However, the influence of grooves on the interface contact states is different with different contact modes: in the spherical and surface contact, the existence of grooves mainly interrupts the continuous contact of the interface, which leads to the change of the normal displacement and the force signal of the interface; The existence of grooves mainly changes the contact area of the interface, which leads to the transfer of the contact stress distribution on the interface, which makes the force signal of the interface change .3. the groove edges scratch the friction interface. It can clean up the debris of the interface, thus reduce the negative effect of the debris on the interface, and then improve the tribological properties of the interface. However, the surface of the groove texture with specific width can effectively improve the tribological properties of the interface. In ball-surface contact, with the width of groove increasing, the scratching action of groove edge on the friction interface will gradually evolve into a strong impact action, thus exacerbating the wear of the interface, and in the face surface contact, with the increase of groove width, The more obvious the change of the interface force signal and the stronger the scratching effect of the groove edge on the interface, the more serious the wear of the friction pair may be. Therefore, it is necessary to design the dimension parameters of the grooves reasonably in order to give full play to the effect of the groove texture surface on the interface, and then improve the tribological characteristics of the friction interface.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH117

【參考文獻】

相關(guān)期刊論文 前10條

1 張旭;蔡振兵;趙磊;張祖川;朱e，

本文編號：1867211