H13钢滚刀刀圈磨损行为及磨损量预测方法研究

发布时间：2018-05-04 03:02

本文选题：盾构 + H13钢　；参考：《中南大学》2013年硕士论文

【摘要】：本文以盾构滚刀刀圈为研究对象,针对我国新一代盾构机降低滚刀磨损量的迫切要求,开展了滚刀刀圈摩擦磨损性能的研究。在盾构施工现场调研的基础上,分析了盾构滚刀的主要失效形式及失效机理。利用非线性有限元软件Abaqus研究了冲蚀速率、冲蚀角、磨粒粒径对刀圈材料(H13钢)冲蚀磨损行为及残余应力的影响；模拟了H13钢滚刀破岩过程,并结合Archard磨损量计算公式提出了滚刀刀圈磨损量预测方法。本文研究结果表明： 1、深圳地铁二号线2226标段施工过程中滚刀最主要的失效形式为刀圈正常磨损,占失效滚刀总数的85%。刀圈偏磨占失效滚刀总数的10%,刀圈断裂占4%。刀圈断裂的机制为脆性崩断,崩断的主要原因是：刀圈组织中存在带状组织及以VC为主的一次MC型碳化物(碳化物分布不均匀,平均尺寸5-20μm),使刀圈韧性降低。 2、500μm的磨粒(刚体)以相同速度先后2次冲蚀H13钢,单次冲蚀磨损率与冲蚀速度均满足指数关系。第1次冲蚀,指数值为2.46；第2次冲蚀,指数值达到2.68,升高9%。对于单磨粒冲蚀,冲蚀率随冲蚀角的增大先升高后降低,当冲蚀速度为75m/s、磨粒粒径为500μm时,最大冲蚀率为0.85mm3/g,对应的冲蚀角为60°。 3、磨粒(花岗岩)冲蚀后,H13钢表面的残余应力为压应力,残余应力值沿垂直于冲蚀面的方向先升高后降低。当冲蚀速度为75m/s、冲蚀角为60°、磨粒粒径为300μm时,残余应力在距表面64μm处达到最大值689MPa,在距表面223μm处,残余压应力转变成残余拉应力。 4、结合有限元方法及Archard磨损量计算公式,提出了滚刀刀圈磨损量的预测方法,预测结果中25号滚刀在中风化花岗片麻岩、微风化花岗片麻岩、凝灰质粉砂岩中破岩时磨损最严重部位的磨损速度分别为2.681×10-4mm/r、4.461×10-4mm/r、1.214×10-4mm/r,预测结果与现场统计结果及实验结果吻合较好。
[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.

【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TG711;TH117

【参考文献】