本文選題：盾構(gòu) + H13鋼�。� 參考：《中南大學(xué)》2013年碩士論文

【摘要】：本文以盾構(gòu)滾刀刀圈為研究對象,針對我國新一代盾構(gòu)機降低滾刀磨損量的迫切要求,開展了滾刀刀圈摩擦磨損性能的研究。在盾構(gòu)施工現(xiàn)場調(diào)研的基礎(chǔ)上,分析了盾構(gòu)滾刀的主要失效形式及失效機理。利用非線性有限元軟件Abaqus研究了沖蝕速率、沖蝕角、磨粒粒徑對刀圈材料(H13鋼)沖蝕磨損行為及殘余應(yīng)力的影響；模擬了H13鋼滾刀破巖過程,并結(jié)合Archard磨損量計算公式提出了滾刀刀圈磨損量預(yù)測方法。本文研究結(jié)果表明： 1、深圳地鐵二號線2226標段施工過程中滾刀最主要的失效形式為刀圈正常磨損,占失效滾刀總數(shù)的85%。刀圈偏磨占失效滾刀總數(shù)的10%,刀圈斷裂占4%。刀圈斷裂的機制為脆性崩斷,崩斷的主要原因是：刀圈組織中存在帶狀組織及以VC為主的一次MC型碳化物(碳化物分布不均勻,平均尺寸5-20μm),使刀圈韌性降低。 2、500μm的磨粒(剛體)以相同速度先后2次沖蝕H13鋼,單次沖蝕磨損率與沖蝕速度均滿足指數(shù)關(guān)系。第1次沖蝕,指數(shù)值為2.46；第2次沖蝕,指數(shù)值達到2.68,升高9%。對于單磨粒沖蝕,沖蝕率隨沖蝕角的增大先升高后降低,當沖蝕速度為75m/s、磨粒粒徑為500μm時,最大沖蝕率為0.85mm3/g,對應(yīng)的沖蝕角為60°。 3、磨粒(花崗巖)沖蝕后,H13鋼表面的殘余應(yīng)力為壓應(yīng)力,殘余應(yīng)力值沿垂直于沖蝕面的方向先升高后降低。當沖蝕速度為75m/s、沖蝕角為60°、磨粒粒徑為300μm時,殘余應(yīng)力在距表面64μm處達到最大值689MPa,在距表面223μm處,殘余壓應(yīng)力轉(zhuǎn)變成殘余拉應(yīng)力。 4、結(jié)合有限元方法及Archard磨損量計算公式,提出了滾刀刀圈磨損量的預(yù)測方法,預(yù)測結(jié)果中25號滾刀在中風(fēng)化花崗片麻巖、微風(fēng)化花崗片麻巖、凝灰質(zhì)粉砂巖中破巖時磨損最嚴重部位的磨損速度分別為2.681×10-4mm/r、4.461×10-4mm/r、1.214×10-4mm/r,預(yù)測結(jié)果與現(xiàn)場統(tǒng)計結(jié)果及實驗結(jié)果吻合較好。
[Abstract]:In this paper, the research object of this paper is to study the friction and wear properties of the hob ring in order to reduce the wear of the hob in the new generation of the shield machine in China. On the basis of the field investigation of the shield construction, the main failure forms and the failure mechanism of the shield hob are analyzed. The nonlinear finite element software Abaqus is used to study the failure mechanism. The impact of erosion rate, erosion angle and abrasive particle diameter on the erosion wear behavior and residual stress of the tool ring material (H13 steel), the rock breaking process of H13 steel hob was simulated, and the prediction method of the wear quantity of the hob ring was put forward with the calculation formula of the Archard wear quantity. The results of this paper showed that:
1, the main failure form of the hob in the construction process of Shenzhen metro line two line 2226 is the normal wear of the knife ring, which accounts for 10% of the total number of failure hobs, which accounts for the total number of invalid hobs, and the mechanism of the fracture of the 4%. cutter ring is brittle avalanche. The main reason for the breakage is that there are banded tissue in the knives and the main VC in the knives. A MC type carbide (uneven distribution of carbide, average size of 5-20 micron m) reduces the toughness of the tool ring.
The 2500 mu m abrasive (rigid body) has eroded H13 steel at the same speed and 2 times successively. The single erosion wear rate and the erosion speed satisfy the exponential relationship. The first erosion, the index value is 2.46, the second erosion, the index value reaches 2.68, the 9%. is increased to the single abrasive erosion, and the erosion rate increases first and then decreases with the increase of the erosion angle, when the erosion speed is 75m/s, abrasive grain When the particle size is 500 m, the maximum erosion rate is 0.85mm3/g, and the corresponding erosion angle is 60 degrees.
3, after abrasive (granite) erosion, the residual stress on the surface of H13 steel is pressure stress. The residual stress value rises first and then decreases along the vertical direction of the erosion surface. When the erosion velocity is 75m/s, the erosion angle is 60 degrees and the abrasive particle diameter is 300 u m, the residual stress reaches the maximum value 689MPa at the distance to the surface 64 mu m, and the residual compressive stress is changed into the residual stress at 223 mu m from the surface. Residual tensile stress.
4, combining the finite element method and the Archard wear calculation formula, the prediction method for the wear of the hob ring is put forward. The wear velocity of the 25 hob in the medium weathered granite gneiss, the weathered granite gneiss and the tuffaceous siltstone is 2.681 * 10-4mm/r, 4.461 x 10-4mm/r, 1.214 x 10-4m, respectively. M/r, the predicted results are in good agreement with the field statistics and experimental results.

【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TG711;TH117

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