本文關(guān)鍵詞： 模擬月巖 切削過(guò)程 熱傳遞機(jī)理 紅外熱像儀　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：為深入了解鉆進(jìn)過(guò)程中熱量的分布規(guī)律,本文對(duì)鉆頭切削模擬月巖的傳熱過(guò)程進(jìn)行分析,建立了鉆頭-月巖-巖屑的導(dǎo)熱微分方程組,找出影響鉆頭工作溫度的因素,得到了鉆頭切削過(guò)程中的溫度解析式和計(jì)算方法,然后分析鉆頭切削月巖過(guò)程的熱功轉(zhuǎn)換形式,得到熱量分配模式,進(jìn)行解析計(jì)算,代入經(jīng)驗(yàn)計(jì)算參數(shù),得到了有關(guān)鉆頭溫度的數(shù)學(xué)表達(dá)式,確定了鉆壓、轉(zhuǎn)速、給進(jìn)速度對(duì)鉆頭溫度的影響。為了簡(jiǎn)化計(jì)算,在鉆壓和轉(zhuǎn)速保持穩(wěn)定的情況下,得到鉆頭溫度和給進(jìn)速度的平方根是正比例關(guān)系。根據(jù)月巖的性質(zhì)參數(shù),本文在實(shí)驗(yàn)中所用的模擬月巖選擇為力學(xué)性質(zhì)和可鉆性等級(jí)與月巖基本一致的大理巖,通過(guò)實(shí)驗(yàn)對(duì)大理巖的力學(xué)參數(shù)進(jìn)行測(cè)試,利用vic-3d非接觸全場(chǎng)應(yīng)變測(cè)量系統(tǒng)對(duì)大理巖的彈性模量和泊松比進(jìn)行測(cè)量,vic-3d系統(tǒng)是一種數(shù)字圖像技術(shù),在實(shí)驗(yàn)中能夠得到被測(cè)試材料表面的應(yīng)變和位移的分布,能夠有效的得到巖石的彈性模量和泊松比,并且節(jié)約時(shí)間和成本。最后通過(guò)室內(nèi)模擬實(shí)驗(yàn),利用紅外熱像儀對(duì)半孔鉆進(jìn)過(guò)程進(jìn)行熱像圖形采集,得到模擬月巖鉆取采樣過(guò)程中熱量分布規(guī)律,通過(guò)對(duì)巖石的溫度場(chǎng)的分析描述,得到巖石溫度場(chǎng)的形狀特點(diǎn)為彈頭狀分布,并且靠近鉆頭的巖石溫度較高,遠(yuǎn)離鉆頭的巖石溫度向兩邊逐漸降低。通過(guò)對(duì)鉆頭溫度場(chǎng)的分析描述,得到鉆進(jìn)過(guò)程中鉆頭的溫度分布,隨著鉆進(jìn)過(guò)程的進(jìn)行,鉆頭的溫度在短暫的時(shí)間內(nèi)迅速升高,然后進(jìn)入穩(wěn)定狀態(tài),對(duì)穩(wěn)定狀態(tài)下的鉆頭溫度進(jìn)行分析,與計(jì)算結(jié)果進(jìn)行對(duì)比,驗(yàn)證鉆頭切削巖石的溫度和給進(jìn)速度的關(guān)系。
[Abstract]:In order to deeply understand the distribution of heat in drilling process, the heat transfer process of bit cutting simulated moon rock is analyzed in this paper, and the heat conduction differential equations of bit, moon rock and cuttings are set up, and the factors influencing the working temperature of bit are found out. The analytical formula and calculation method of temperature during bit cutting are obtained, and then the thermal power conversion form of bit cutting moon rock is analyzed, the heat distribution mode is obtained, the analytical calculation is carried out, and the experiential calculation parameters are added. The mathematical expression of bit temperature is obtained, and the influence of drilling pressure, rotating speed and feed velocity on bit temperature is determined. In order to simplify the calculation, while the drilling pressure and rotating speed remain stable, It is obtained that the square root of bit temperature and feed velocity is proportional. According to the property parameters of lunar rock, the simulated lunar rock used in this paper is chosen as marble with mechanical properties and drillability grade basically consistent with lunar rock. The measurement of elastic modulus and Poisson's ratio of marble by vic-3d non-contact full-field strain measurement system is a digital image technique. In the experiment, the strain and displacement distribution on the surface of the tested material can be obtained, the elastic modulus and Poisson's ratio of rock can be obtained effectively, and the time and cost can be saved. The thermal image of half-hole drilling process is collected by infrared thermal imager, and the heat distribution in the sampling process of simulated lunar rock drilling is obtained. By analyzing and describing the temperature field of rock, the shape characteristic of rock temperature field is warhead distribution. And the rock temperature near the bit is higher, and the rock temperature away from the bit gradually decreases to both sides. Through the analysis and description of the bit temperature field, the temperature distribution of the bit in the drilling process is obtained, with the drilling process going on, The temperature of the bit rises rapidly in a short time and then enters a stable state. The temperature of the bit in the stable state is analyzed and compared with the calculated results to verify the relationship between the temperature of the bit cutting the rock and the feeding velocity.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P184.5;P634

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本文編號(hào)：1496805