Dedicated drill design for reduction in burr and delamination during the drilling of composite materials

In the drilling of composite materials such as carbon fiber reinforced plastic, burrs and delamination occur during machining. This study proposed a design of a drill tool with a shape that suppresses burrs and delamination during the drilling of composite materials. The tool shape (tip, groove, land, etc.) is determined, and a nick shape that cuts off chips and reduces heat generation is adopted. A finite element analysis and an experimental evaluation involving 4600 holes were conducted. The maximum errors in the hole diameter and roundness were 15 μm and 0.016, respectively. Further, the maximum burr height was observed to be 80 μm or less, and delamination was not observed in the experiment.     

Simba采矿钻车的炮孔定位定向系统分析

采矿钻车是为回采矿石而进行钻孔作业的钻车。不同的采矿方法所要求炮孔的方向、孔径、孔深是各不相同的。根据所钻孔深的不同，我们将采矿钻车分为浅孔钻车与中深孔钻车两大类。浅孔采矿钻车所钻孔的直径一般不超过64mm．孔深不超过5～6m。国外浅孔采矿钻车一般采用万能式钻臂，和掘     

我国金属矿山采掘机械化总论

大力推行机械化的金属矿山为我院矿山机械研究提供了广阔的天地。因此，有必要在总结和检验我院矿山机械研究成果时，以本文为前奏，放眼拓宽到全国，从总体上，回顾矿山机械化在我国的历史进程，使我们能从正反两方面的经验和教训中获益，认识到该怎么做，不该怎么做；分析矿山机械化的现状，可以检验我们的科研工作在全国矿山机械化建设中占有多大的比重，了解到在“众人拾柴”之中，我们做了些什么，还有哪些没有做；提出当前矿山机械化工作中存在的问题和确定今后的主攻方向，实际上是论述“的”与“矢”的关系，使我们未来的科研工作更“有的放矢”，更显成效。     

中国大陆科学钻探CCSD-1井钻井液流变模式的选择与循环压力降

针对CCSD-1井的钻进方法、井身结构和泥浆体系,通过2000m取心钻进的实施情况和采集的钻井液性能检测数据,采用数理统计和回归分析的方法,优选了卡森流变模式,计算CCSD-1井不同井深的循环压降。结合现场的生产实际,分别测定了螺杆马达、液动潜孔锤和双管取心钻具的循环压降,最后,确定了钻井液循环通道各部分的压力分布。     

钻孔灌注桩质量施工初探

论述了钻孔灌注桩以其特有的优点被广泛应用，但由于其施工工艺的复杂及对水下混凝土的施工要求，应从钻孔灌注桩的施工及工序入手做好事前和事中控制，排除隐患，提高施工质量。     

告成煤矿一起钻场火灾的原因分析

对告成矿出现的一起钻场火灾原因进行了认真分析,阐述了所采取的主要防范措施.     

工业机器人

介绍了我国工程机械行业开展机器人化研究的现状,并对喷浆机器人、压路机器人、隧道凿岩机器人等的研究开发情况逐一进行了介绍。     

厚松散层钻探工艺技术

在厚松散层中进行钻孔施工较常规钻孔存在一些技术难题，按照常规方法达不到钻孔目的或者花费较大的人力和物力。本文通过分析松散层钻孔正常钻进的影响因素，采用正循环钻孔施工技术进行施工，提出钻孔防偏和纠偏措施，最后给出了厚松散层钻孔施工技术措施，对厚松散层钻探技术具有一定的指导意义。     

单2-支平8井优快钻井技术研究

单2-支平8井是胜利油田第一口大斜度垂向分支水平井,分支井眼的最大井斜达116度,通过优化钻井参数、井眼轨迹以及分支点窗口形态等配套技术使得该井在短短8天的时间内完钻,这对于大斜度分支水平井钻井有一定的指导和借鉴意义。     

Removal of contaminants from polluted drilling mud using supercritical carbon dioxide extraction

Liquid drilling fluid is often called drilling mud is heavy, viscous fluid mixtures use to carry rock cuttings to the surface and lubricate and cool the drill bit. During carrying cuttings they contaminated which not only reduce their functionality but also make them a hazardous and dangerous wastes which cannot be discharged anywhere without treatment. Due to this fact, in the present study, supercritical extraction process was used to remove contaminants from the drilling mud. Regarding this, effect of different parameters including extraction temperature (313–338 K) and pressure (100–200 bar), flow rate of CO₂ (0.05–0.36 cm³/s) and static time (20–130 min) on the removal of contaminations from drilling mud was examined using the design of experiment of changing one factor at a time. The obtained results revealed that the optimum operational conditions that lead to the highest removal degree of contaminations are temperature and pressure of 333 K and 180 bar, respectively, flow rate of lower than 0.1 cm³/s and the static time of 110 min. In addition, to examine the effect of the supercritical extraction on the crystalline structure modification and removal contaminations X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses were performed which confirmed the successful removal of contaminations from the drilling mud without significant crystalline modification.