The intermediate linear cutting machine (ILCM) is a machine designed to work on an intermediate scale between the full- and the small-scale. The reduced scale involves several advantages compared to full-scale tests, especially in terms of sample supplying and transportation. On the other hand, it has an impact on the testing conditions, resulting in a limitation of the cutting penetration and spacing during the test, as well as in a smaller disc cutter. This affects most of the results, which cannot be directly used for the on-site machine performance prediction. However, some experimental results provided in the literature show that the optimal spacing/penetration ratio is not significantly affected by the changes involved. On this basis, the results obtained from ILCM tests should provide reliable information about the optimal cutting conditions of a tunnel boring machine in massive rock mass. The work performed included the development of some improvements of the testing rig, as well as a modified ILCM testing procedure, according to the one typically used in standard LCM tests. The results provide information about the attitude of the tested lithotypes to mechanical excavation by means of disc tools, including the optimal cutting conditions. Additional work was developed in terms of detailed characterisation of the rock samples involved and assessment of the size distribution of the debris produced during the ILCM tests. Nevertheless, further tests are necessary, in order to assess the consistency of the experimental procedure employed and to investigate the scale effect.
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共查询到16条相似文献，搜索用时 781 毫秒
1.
西欧的超硬材料及制品技术 总被引：1，自引：0，他引：1
介绍了西欧超硬材料（ＰＣＤ,ＰＣＢＮ）锯片级人造金刚石单晶,超硬,刀具及其制造设备;金刚石制品;石材与石材加工机械,工器具等现状和发展方向,对我国超硬材料业的发展提出了建议。 相似文献
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钻井工程用超硬材料及钻头的发展 总被引：10，自引：0，他引：10
介绍了钻井工程用超硬复合材料（包括ＰＤＣ、ＰＣＢＮ、陶瓷和金刚石膜）的发展现状及前景;同时也介绍了以这些材料切削具的钻头制造及应用情况;指出金刚石膜合成技术的发展已使金刚石膜制造钻井工程用切削具成为可能。 相似文献
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根据Ｇｏｒｌａｎｄ强度理论中平均自由程与材料性能的关系,通过一系列的试验和回归分析,研究了ＰＣＢＮ的内部结构,成份组成与其抗压强度的磨耗比之间的关系,建立了ＣＢＮ粒度、结合剂掺入量与ＰＣＢＮ平均自由程、抗压强度、耐磨性之间的关系式,对提高ＰＣＢＮ的性能具有重要的指导价值。 相似文献
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介绍了ＰＣＢＮ的发展情况以及开发研究这种材料的意义，分析了其合成工艺中的几个关键技术问题及所采用的方法，并给出了对其性能进行了监测的方法。 相似文献
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立方氮化硼内其具有“三高”特性，而成为一种理想的硬磨料得以发展，着重介绍了立方氮化硼磨具和刀具及其推广应用，并阐述其技术的发展对机械加工技术的进步具有重要的意义。 相似文献
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国外自美国GE公司于七十年代首次合成聚晶金刚石复合片以来，聚晶金刚石及复合片的研制工艺水平又有了很大程度的提高，复合片品种形式增加了许多。本文将介绍美国、瑞典、英国、日本和苏联等国家的五种聚晶金刚石和十一种聚晶金刚石复合片及切削具的制造方法。一、五种聚晶金刚石1．硅合金浸渍的聚晶金刚石这种聚晶金刚石由美国Sii Megadiamond Inc，于1985年7月研制成功。它使用硅与Ⅷ族金属的混合粉末形式与已去掉触媒金属的聚晶金刚石一起放入六面顶或两面顶压机中制造而成。含硅混合物在高温高压 相似文献
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化学气相沉积（ＣＶＤ）金刚石薄膜的面市，为钻进岩石选用新型切削具开辟了新设计途径。其功能明显地表现在：（ａ）良好的均匀磨损机制；（ｂ）高温下钻进效果好；（ｃ）热导率高；（ｄ）与其他材质易于形成层状结构。用碳化钨钨钴硬合金片（ＴＣ）、热稳性聚晶（ＴＳＰ）、金刚石聚晶复合片（ＰＣＤ）制成的多层切削具，为设计制造新式钻头提供以下功效：（ａ）在硬而裂隙岩石中钻进能抗冲击载荷；（ｂ）可进行抗热设计以限制切削 相似文献
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我国钻探用金刚石聚晶材料的工艺研究 总被引：8，自引：0，他引：8
系统地阐述了我国钻探用金刚石聚晶材料（ＰＣＬ）的工艺研究方面的独到之处，特别是在确定影响ＰＣＤ耐磨性的主要工艺因素，以及如何提高、调整和控制耐磨性的工艺方法方面的研究成果。 相似文献
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从组合切削具将在岩石中产生预破碎区的论点出发,通过实验定量研究了预破碎区深度与掏槽刃切入深度的关系,得出了预破碎区有利于降低岩石强度及岩石破碎能耗的结论,并用生产试验结果进行了验证。提出了孕镶金刚石钻头钻进Ⅶ～Ⅷ级硬岩时仍存在预破碎区和切削、微切削破岩方式,以及预破碎区并非越大越好的学术观点。 相似文献
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我国正处于钢筋混凝土结构应用与发展的大规模新建与修复改造并重阶段。为对钢混结构进行局部或整体的拆除与修复改造,传统机械破碎与爆破拆除方式存在施工效率低、安全隐患大和环境污染严重等问题,而利用金刚石工具对其进行静力切割拆除的施工方法在近年来得到迅速发展。目前,在钢混结构拆除与修复改造施工中应用最多的金刚石工具为金刚石薄壁钻头、金刚石锯片和金刚石绳锯。本文对上述3类金刚石工具在钢混结构修复改造施工中的应用现状、钻进与锯切机理、制造技术和施工工艺等研究现状进行了总结与分析,在此基础上指出了其可能的研究趋势与发展方向。研究成果可为金刚石工具在工民建和部分特殊领域的广泛应用提供技术参考。 相似文献
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Cardu M. Rispoli A. Iabichino G. Oreste P. Vagnon F. 《Geotechnical and Geological Engineering》2021,39(5):3573-3597
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The process of cutting homogeneous soft material has been investigated extensively. However, there are not so many studies on cutting heterogeneous brittle material. In this paper, R‐T2D (Rock and Tool interaction), based on the rock failure process analysis model, is developed to simulate the fracture process in cutting heterogeneous brittle material. The simulated results reproduce the process involved in the fragmentation of rock or rock‐like material under mechanical tools: the build‐up of the stress field, the formation of the crushed zone, surface chipping, and the formation of the crater and subsurface cracks. Due to the inclusion of heterogeneity in the model, some new features in cutting brittle material are revealed. Firstly, macroscopic cracks sprout at the two edges of the cutter in a tensile mode. Then with the tensile cracks releasing the confining pressure, the rock in the initially high confining pressure zone is compressed into failure and the crushed zone gradually comes into being. The cracked zone near the crushed zone is always available, which makes the boundary of the crushed zone vague. Some cracks propagate to form chipping cracks and some dip into the rock to form subsurface cracks. The chipping cracks are mainly driven to propagate in a tensile mode or a mixed tensile and shear mode, following curvilinear paths, and finally intersect with the free surface to form chips. According to the simulated results, some qualitative and quantitative analyses are performed. It is found that the back rake angle of the cutter has an important effect on the cutting efficiency. Although the quantitative analysis needs more research work, it is not difficult to see the promise that the numerical method holds. It can be utilized to improve our understanding of tool–rock interaction and rock failure mechanisms under the action of mechanical tools, which, in turn, will be useful in assisting the design of fragmentation equipment and fragmentation operations. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
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