發(fā)布時(shí)間：2018-03-05 21:11

  本文選題：軸承鋼　切入點(diǎn)：超聲空化　出處：《北京交通大學(xué)》2013年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：軸承潤(rùn)滑的目的主要是減小摩擦功耗、降低磨損率、冷卻、防塵、防銹以及吸振,軸承常用的潤(rùn)滑材料是潤(rùn)滑油和潤(rùn)滑脂,隨著對(duì)潤(rùn)滑要求的提高,目前潤(rùn)滑脂的應(yīng)用越來(lái)越廣泛。 為提高潤(rùn)滑脂的性能,常常要往潤(rùn)滑脂里加入各種添加劑,添加劑是潤(rùn)滑脂的核心技術(shù)之一。隨著固體添加劑的超細(xì)化發(fā)展,由于其表面張力大,在潤(rùn)滑脂生產(chǎn)過(guò)程中,容易產(chǎn)生聚集的問(wèn)題。 本論文用自行研制的超聲波分散儀,對(duì)自制添加有MoS2超細(xì)顆粒的鈣基潤(rùn)滑脂施加超聲波進(jìn)行超聲分散工藝的優(yōu)化,通過(guò)對(duì)機(jī)械攪拌、潤(rùn)滑脂稠化后的超聲處理和潤(rùn)滑脂基礎(chǔ)油階段的超聲處理三種分散工藝下的潤(rùn)滑脂圖片對(duì)比,并進(jìn)行對(duì)材料摩擦系數(shù)的測(cè)量和MOS2添加劑分散均勻性的表征,最終得出最佳工藝為潤(rùn)滑脂基礎(chǔ)油階段的超聲分散。 在最佳分散工藝下,分別測(cè)量不同超聲波分散功率對(duì)鈣基潤(rùn)滑脂性能的影響。通過(guò)對(duì)超聲波不同功率分散后潤(rùn)滑脂結(jié)構(gòu)的觀察、材料摩擦系數(shù)的測(cè)量、潤(rùn)滑脂粘度的測(cè)量及MoS2添加劑分散均勻性的表征,得出結(jié)論：在不同的超聲波分散功率作用下,摩擦系數(shù)隨著超聲波分散功率的增加而降低；超聲波分散功率的變化不會(huì)對(duì)潤(rùn)滑脂粘度產(chǎn)生影響；MoS2添加劑在潤(rùn)滑脂中的分散均勻性隨超聲波功率的增加有明顯提高。 最后結(jié)合滲氮軸承鋼材料進(jìn)行磨損表面的觀察和分析,在對(duì)滲氮軸承鋼材料的磨斑情況分析中發(fā)現(xiàn),摩擦形式主要為磨粒磨損,磨斑面積隨超聲波分散功率的增加呈現(xiàn)出遞減的趨勢(shì),基體形貌由最初的條紋狀分布發(fā)展到塊狀分布,并且面積也是越來(lái)越大。經(jīng)過(guò)往復(fù)磨損實(shí)驗(yàn)發(fā)現(xiàn)：軸承鋼材料的滲氮層沒(méi)有被突破,整體元素的峰值變化不大,只是N元素含量有所降低。潤(rùn)滑脂的減損效果隨超聲波功率的增加有了明顯的提高。 實(shí)驗(yàn)數(shù)據(jù)表明：該分散工藝簡(jiǎn)單實(shí)用,固體添加劑MoS2在鈣基潤(rùn)滑脂中的分散均勻性有明顯提高,經(jīng)過(guò)潤(rùn)滑脂基礎(chǔ)油階段的超聲波處理后粘度不會(huì)發(fā)生變化。用于潤(rùn)滑滲氮軸承鋼材料,其減磨減損性能有了較大的提高。
[Abstract]:The main purpose of bearing lubrication is to reduce friction power consumption, reduce wear rate, cooling, dust prevention, rust prevention and vibration absorption. The common lubricating materials for bearings are lubricating oil and grease, with the increase of lubrication requirements, At present, the application of grease is more and more extensive. In order to improve the performance of lubricating grease, it is often necessary to add a variety of additives to the grease, which is one of the core technologies of the grease. With the development of superfine solid additives, because of its large surface tension, in the process of grease production, The problem of gathering easily arises. In this paper, the ultrasonic dispersing process of calcium base grease added with MoS2 ultrafine particles was optimized by ultrasonic disperser, and the mechanical agitation was carried out. The pictures of lubricating grease after ultrasonic treatment and ultrasonic treatment in grease base oil stage were compared, and the friction coefficient of material was measured and the dispersion uniformity of MOS2 additive was characterized. Finally, the best process is ultrasonic dispersion of grease base oil. The effects of different ultrasonic dispersion power on the properties of calcium base grease were measured under the optimum dispersion technology. The friction coefficient of the material was measured by observing the structure of grease after the dispersion of different ultrasonic power. Measurement of grease viscosity and characterization of dispersion uniformity of MoS2 additive. It is concluded that the friction coefficient decreases with the increase of ultrasonic dispersion power under different ultrasonic dispersion power. The dispersion uniformity of MoS2 additive in grease increases with the increase of ultrasonic power. Finally, the wear surface of nitrided bearing steel is observed and analyzed. It is found that the main friction form is abrasive wear in the analysis of wear spot of nitriding bearing steel. With the increase of ultrasonic dispersion power, the wear spot area decreased, and the matrix morphology developed from the initial stripe distribution to the block distribution. Through the reciprocating wear experiments, it was found that the nitriding layer of the bearing steel material was not broken through, and the peak value of the whole element did not change much. However, the content of N element decreased, and the decreasing effect of grease increased with the increase of ultrasonic power. The experimental data show that the dispersing process is simple and practical, and the dispersion uniformity of solid additive MoS2 in calcium base grease is obviously improved. The viscosity will not change after ultrasonic treatment in the grease base oil stage, and the wear reduction and impairment performance of the material used for lubricating nitriding bearing steel has been greatly improved.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TH117.2

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