本文關(guān)鍵詞：螺旋型取芯鉆頭巖石鉆進(jìn)負(fù)載特性研究　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 月面鉆取采樣 巖石 螺旋型鉆頭 布齒設(shè)計 切削負(fù)載

【摘要】：我國探月工程三期任務(wù),擬通過鉆取采樣裝置獲取深度為兩米的月壤樣品。取芯鉆具是實現(xiàn)鉆進(jìn)和樣品收集的核心功能部件,由鉆頭、鉆桿和取芯機構(gòu)等組成。為了成功獲取月球樣品,需要鉆具對小尺度月壤和隨機分布的月巖具有可靠的鉆進(jìn)能力和取芯能力。本文以螺旋構(gòu)型的鉆頭基體為研究對象,利用理論研究、數(shù)值模擬和實驗驗證等手段,開展螺旋型鉆頭的切削齒布齒設(shè)計研究,以提高螺旋構(gòu)型鉆頭對巖石的鉆進(jìn)能力。以巖石破碎力學(xué)為理論基礎(chǔ),基于巖石莫爾失效準(zhǔn)則,建立了巖石單齒壓入和單齒切削力學(xué)模型,為切削過程切削齒負(fù)載特性計算提供了理論依據(jù)。在此基礎(chǔ)上,研制了單齒切削實驗臺,開展了大理巖切削的單因素實驗、正交實驗,驗證了切削齒前角、后角、齒寬,以及切削深度、切削速度對切削負(fù)載的影響規(guī)律。依據(jù)理論模型和實驗數(shù)據(jù),開展了切削齒結(jié)構(gòu)參數(shù)、鉆進(jìn)規(guī)程參數(shù)對巖石切削負(fù)載影響的顯著性分析,為單切削齒空間結(jié)構(gòu)參數(shù)設(shè)計以及螺旋型鉆頭的布齒設(shè)計奠定了基礎(chǔ)。應(yīng)用顯式動力分析有限元軟件LS-DYNA,開展了單切削齒與巖石相互作用數(shù)值模擬和仿真研究。建立了正前角、零前角、負(fù)前角切削模型,仿真模擬了切削力作用下巖石內(nèi)部應(yīng)力分布情況以及巖石的破碎形式。建立了切削齒直線切削以及回轉(zhuǎn)切削模型,獲得了同等規(guī)程參數(shù)條件下的巖石切削負(fù)載,建立了直線切削與回轉(zhuǎn)切削負(fù)載特性之間的聯(lián)系。以螺旋型鉆頭為基體,開展了單切削齒和整體鉆頭多切削齒回轉(zhuǎn)切削力學(xué)建模研究,提出了各切削齒等切削量布齒設(shè)計準(zhǔn)則,形成了螺旋型鉆頭基體布齒的優(yōu)化設(shè)計方法。依據(jù)理論分析、實驗研究以及仿真模擬的結(jié)果,開展了單切削齒空間結(jié)構(gòu)參數(shù)設(shè)計。研制了螺旋形鉆頭試驗件,對比驗證了切削布齒軌跡、切削齒數(shù)量、螺旋翼頭數(shù)對切削負(fù)載特性的影響。本文形成的螺旋型鉆頭基體切削齒的布齒設(shè)計方法,繼承了螺旋型鉆頭對月壤取芯率高的技術(shù)優(yōu)勢,提升了該構(gòu)型鉆頭對巖石的鉆進(jìn)能力。對探月三期取芯鉆具的優(yōu)化設(shè)計提供了技術(shù)支持。
[Abstract]:In the third phase of China's lunar exploration project, the lunar soil samples with a depth of two meters are to be obtained by drilling and sampling device. The core function component of drilling and sample collection is cored drilling tool, which is made up of drill bits. In order to obtain the lunar samples successfully. It is necessary for drilling tools to have reliable drilling ability and coring ability for small scale lunar soil and random distribution of lunar rock. In this paper, the helical configuration of the bit matrix is taken as the research object, and the theoretical study is used. By means of numerical simulation and experimental verification, the design of cutting tooth arrangement of spiral bit is carried out in order to improve the drilling ability of helical configuration bit to rock, which is based on rock crushing mechanics. Based on the failure criterion of rock moire, the model of rock single tooth indentation and single tooth cutting force is established, which provides a theoretical basis for the calculation of cutting tooth load characteristics. On this basis, a single tooth cutting experiment bench is developed. The single factor experiment and orthogonal experiment of marble cutting were carried out to verify the influence of cutting tooth front angle, rear angle, tooth width, cutting depth and cutting speed on cutting load, according to the theoretical model and experimental data. The influence of cutting tooth structure parameters and drilling rules parameters on rock cutting load is analyzed. It lays a foundation for the design of spatial structure parameters of single cutting teeth and the design of spiral bit. The explicit dynamic analysis finite element software LS-DYNA is used. Numerical simulation and simulation study on the interaction between single cutting tooth and rock are carried out. The cutting models of positive anterior angle, zero anterior angle and negative anterior angle are established. Under the action of cutting force, the stress distribution inside the rock and the form of rock breakage are simulated, and the cutting load of rock under the same specification parameters is obtained by establishing the cutting tooth straight line cutting and rotary cutting model. The relationship between the load characteristics of linear cutting and rotary cutting is established. Based on the helical bit, the rotary cutting force modeling of single cutting teeth and integral bit multi-cutting teeth is carried out. The optimum design method of spiral bit matrix tooth placement is formed according to the theoretical analysis, experimental research and simulation results. The design of spatial structure parameters of single cutting teeth was carried out, and the experimental piece of helical bit was developed, and the track of cutting teeth and the number of cutting teeth were compared and verified. The influence of the number of helical wing heads on the cutting load characteristics. The design method of the helical bit base cutting teeth in this paper inherits the technical advantage of the helical bit to the high core rate of lunar soil. It improves the drilling ability of the configuration bit to rock and provides technical support for the optimization design of the core drilling tool in the third phase of lunar exploration.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P634;P184.5

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