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  本文選題：滑動摩擦　切入點：粘著磨損　出處：《華中科技大學(xué)》2011年碩士論文

【摘要】：滾動轉(zhuǎn)子式壓縮機止推軸承長期處于重載、高速、高溫等惡劣工作環(huán)境中,其潤滑狀況及摩擦磨損特性將直接影響到壓縮機的運行性能與使用壽命。因此,研究其摩擦磨損特性對保障壓縮機的正常運轉(zhuǎn)具有非常重要的意義。 本文以提高滾動轉(zhuǎn)子式壓縮機止推軸承耐磨性、降低摩擦功耗為研究目標。首先,從理論上分析了影響摩擦副磨損量和摩擦功耗的各主要因素�；诮�(jīng)典的粘著磨損模型,建立了邊界潤滑狀態(tài)下滾動轉(zhuǎn)子式壓縮機止推軸承磨損量和摩擦功耗數(shù)值分析模型。模型中考慮了載荷、轉(zhuǎn)速、止推面半徑等影響因素。通過數(shù)值模擬計算,對比分析了這些因素對滾動轉(zhuǎn)子式壓縮機止推軸承磨損量和摩擦功耗的影響。在此基礎(chǔ)上,采用Visual C++編制了滾動轉(zhuǎn)子式壓縮機止推軸承摩擦磨損性能分析軟件。軟件具有友好的操作界面,可以方便用戶使用。 在完成理論建模與分析的基礎(chǔ)上,開展了滾動轉(zhuǎn)子式壓縮機止推軸承摩擦磨損性能的實驗研究。通過正交實驗、定載變速與定速變載實驗測取了不同工況下試件的磨損量和摩擦功耗等實驗數(shù)據(jù)。對比分析了載荷、轉(zhuǎn)速、止推面半徑等外摩擦條件對試件磨損量和摩擦系數(shù)的影響,并根據(jù)實驗測試結(jié)果修正了理論模型中的參數(shù)值,提高了模型的準確性。 通過對止推軸承摩擦磨損理論分析與實驗測試結(jié)果的對比分析表明,理論模型計算值與實驗值比較吻合,驗證了理論模型的正確性與準確性。通過正交實驗研究表明,載荷是影響磨損量的最重要外摩擦因素;潤滑油種類是影響摩擦系數(shù)的最重要因素。通過實驗數(shù)據(jù)的分析表明,在相同條件下磨損量隨著載荷的增加而增大,當(dāng)載荷到達一定值時,磨損量急劇增加。在一定轉(zhuǎn)速范圍內(nèi),磨損量隨著轉(zhuǎn)速的增加而減小,減小到一定值后趨于平穩(wěn)。對模擬真機實驗結(jié)果的分析表明,摩擦功耗隨止推面半徑的增大先增大后減少;隨著載荷和轉(zhuǎn)速的增大而增大并都成正比關(guān)系。通過對對磨試樣摩擦表面的顯微觀察,進一步驗證壓縮機止推軸承磨損機理主要是粘著磨損。
[Abstract]:The rolling rotor type compressor thrust bearing is in the heavy load, high speed and high temperature working environment for a long time, its lubrication condition and friction and wear characteristic will directly affect the compressor's running performance and service life.Therefore, it is very important to study its friction and wear characteristics to ensure the normal operation of compressor.The purpose of this paper is to improve the wear resistance and reduce the friction power of thrust bearing of rolling rotor compressor.Firstly, the main factors affecting the wear and friction power consumption of friction pairs are analyzed theoretically.Based on the classical adhesive wear model, a numerical analysis model of wear and friction power consumption of thrust bearing of rolling rotor compressor under boundary lubrication is established.Factors such as load, speed and thrust radius are considered in the model.The effects of these factors on wear and friction power consumption of thrust bearing of rolling rotor compressor are compared and analyzed by numerical simulation.On this basis, the friction and wear performance analysis software of thrust bearing of rolling rotor compressor is programmed by Visual C.The software has a friendly operating interface and can be easily used by users.On the basis of theoretical modeling and analysis, the friction and wear performance of thrust bearing of rolling rotor compressor is studied experimentally.The experimental data of wear and friction power consumption of specimens under different working conditions were measured by orthogonal experiment, constant load change experiment and constant speed variable load experiment.The effects of external friction conditions such as load, rotation speed and thrust surface radius on the wear and friction coefficient of the specimen are compared and analyzed. The parameters in the theoretical model are corrected according to the experimental results, and the accuracy of the model is improved.The comparison between the theoretical analysis and the experimental results of friction and wear of thrust bearing shows that the calculated value of the theoretical model is in good agreement with the experimental value, which verifies the correctness and accuracy of the theoretical model.The orthogonal experiment shows that the load is the most important external friction factor affecting the wear rate and the type of lubricating oil is the most important factor affecting the friction coefficient.The analysis of experimental data shows that the wear amount increases with the increase of load under the same condition, and increases sharply when the load reaches a certain value.In a certain range of rotational speed, the wear amount decreases with the increase of rotational speed, and tends to be stable after decreasing to a certain value.The analysis of the experimental results shows that the friction power consumption increases firstly and then decreases with the increase of the thrust radius, and increases with the increase of load and speed.The wear mechanism of compressor thrust bearing is mainly adhesive wear through microscopic observation of friction surface of grinding sample.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH45

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