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  本文選題：低溫冷風納米粒子射流微量潤滑　切入點：低溫納米流體　出處：《湘潭大學》2017年碩士論文

【摘要】：磨削加工能獲得較好的表面精度,提高表面質量,是不可或缺的精加工工藝。但由于砂輪表面磨粒與工件接觸時,通常是負前角切削,因此磨削加工中的磨削溫度和磨削力都大于其他加工形式。面對磨削加工中的磨削熱和磨削力,現(xiàn)在廣泛的應用澆注式潤滑冷卻方式,但是由于澆注式潤滑冷卻方式,在高速高載加工中的冷卻潤滑性能并不突出,且磨削液的大量使用會造成環(huán)境的污染和加工成本的提高,所以提出了綠色磨削加工方式。干磨削和低溫冷風微量潤滑技術雖然可以滿足環(huán)保的要求,但是其潤滑冷卻效果不理想,難以獲得較好的工件表面質量。提出了低溫冷風納米粒子射流微量潤滑技術,綜合了低溫冷風和納米粒子射流潤滑技術的優(yōu)點,通過在低溫磨削液中添加納米顆粒,不僅提高了磨削液的換熱性能,降低磨削區(qū)的磨削溫度,同時由于納米顆粒的自身物理特性和磨削溫度的下降,進一步增強了磨削液的潤滑性能。本文的主要工作包括如下幾個方面:1、運用了“二步法”,將納米二硫化鉬顆粒添加到植物性的低溫磨削液中,制備了不同質量分數(shù)的低溫納米流體,通過靜置一段時間后,測量流體頂部的漸變層高度來評估不同納米粒子質量分數(shù)下的低溫納米流體的懸浮穩(wěn)定性。2、對制備的8中不同質量分數(shù)的低溫納米流體進行了基于淬硬軸承鋼GCr15材料的濕式往復摩擦磨損實驗,通過測量摩擦磨損過程中的摩擦系數(shù),磨損后的溝槽形貌和對磨鋼球的磨斑大小來表征不同質量分數(shù)的低溫納米流體的潤滑性能,得出了其中潤滑性能最優(yōu)的一個質量分數(shù)。3、基于干磨削、澆注式磨削、低溫冷風微量潤滑磨削和低溫冷風納米粒子射流微量潤滑磨削四種不同的磨削工況對淬硬軸承鋼材料進行了磨削加工實驗,通過衡量不同磨削參數(shù)下的法向磨削力、比磨削能和磨削溫度,來評估不同的潤滑冷卻方式在不同的磨削參數(shù)下的適應性,針對低溫冷風納米粒子射流微量潤滑技術,得到一個較優(yōu)的磨削參數(shù)。摩擦磨損實驗結果表明,低溫納米流體能有效的降低摩擦系數(shù),減小工件和和鋼球的磨損;對淬硬軸承鋼的磨削試驗結果來看,低溫納米粒子射流微量潤滑技術可以有效的降低磨削過程中的磨削力和磨削溫度,提高表面質量,尤其是在高速重載的條件下,其優(yōu)越的冷卻潤滑性能更加突出。
[Abstract]:Grinding can obtain better surface precision and improve surface quality, which is an indispensable finishing process. However, when grinding wheel surface abrasive particles are in contact with workpiece, it is usually cutting at negative front angle. Therefore, the grinding temperature and force in grinding process are higher than other machining forms. Facing the grinding heat and force in grinding machining, it is widely used in pouring lubricating cooling mode, but because of pouring lubricating cooling mode, The cooling and lubricating performance in high speed and high load machining is not outstanding, and the extensive use of grinding fluid will cause environmental pollution and increase the processing cost. Therefore, the green grinding processing method is put forward. Although dry grinding and low temperature cold air micro lubrication technology can meet the requirements of environmental protection, its lubricating and cooling effect is not ideal. It is difficult to obtain good surface quality of workpiece. This paper puts forward the micro lubrication technology of low temperature cold air nanoparticle jet, which synthesizes the advantages of low temperature cold air and nano particle jet lubrication technology, by adding nanometer particles to the low temperature grinding fluid. It not only improves the heat transfer performance of the grinding fluid and reduces the grinding temperature in the grinding area, but also reduces the physical properties of the nanoparticles and the grinding temperature. The lubricity of grinding fluid is further enhanced. The main work of this paper includes the following aspects: 1. By using "two-step method", the nano-molybdenum disulfide particles are added to the low temperature grinding fluid of plant properties. Low temperature nanofluids with different mass fractions were prepared. The gradient layer height at the top of the fluid was measured to evaluate the suspension stability of low-temperature nano-fluids with different mass fraction of nano-particles. 8 low-temperature nano-fluids with different mass fractions were prepared based on hardened bearing steel GCr15. Wet reciprocating friction and Wear experiment of Materials, The lubrication properties of low temperature nanofluids with different mass fractions were characterized by measuring friction coefficient, groove morphology and wear spot size of steel ball during friction and wear. A mass fraction of which has the best lubricity. 3, which is based on dry grinding, pouring grinding, Four different grinding conditions, low temperature cold air micro lubrication grinding and low temperature cold air nano particle jet micro lubrication grinding, are carried out on grinding of hardened bearing steel material. The normal grinding force under different grinding parameters is measured. Specific grinding energy and grinding temperature are used to evaluate the adaptability of different lubricating cooling methods under different grinding parameters. A better grinding parameter is obtained. The results of friction and wear experiments show that the low temperature nano-fluid can effectively reduce the friction coefficient and the wear of workpiece and ball. Low-temperature nano-particle jet micro-lubrication technology can effectively reduce the grinding force and grinding temperature, improve the surface quality, especially under the condition of high speed and heavy load, its superior cooling lubrication performance is more outstanding.
【學位授予單位】：湘潭大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG580.15

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本文編號：1696507