共查询到20条相似文献，搜索用时 15 毫秒
1.
Mohammad Ataei Reza Mikaiel Farhang Sereshki Narges Ghaysari 《Arabian Journal of Geosciences》2012,5(6):1289-1295
Performance prediction of diamond wire saws is important in the cost estimation and the planning of the stone quarries. An accurate estimation of sawability helps to make the planning of the rock cutting projects more efficient. In this paper, the performance prediction of diamond wire saws in cutting carbonate rocks was studied on 14 different carbonate rocks in stone quarries located in Iran. Rock samples were collected from the quarries for laboratory tests. Uniaxial compressive strength, Brazilian tensile strength, Schmidt hammer value, and Los Angeles abrasion were determined in the laboratory. Performance prediction was evaluated using simple and multiple regression analyses. Finally, a new model was proposed for predicting the production rate of diamond wire saw. It was concluded that the production rate of carbonate rock using diamond wire saw can reliably be estimated using the developed model. 相似文献
2.
S. Najmedin Almasi Raheb Bagherpour Reza Mikaeil Yilmaz Ozcelik Hamid Kalhori 《Geotechnical and Geological Engineering》2017,35(4):1311-1326
One of the key parameters that affect the selection of equipment and the cost estimation of dimension stone quarries is the rock cutting rate or production rate. In this study, the M5P tree algorithm is used to determine the relationship between the hard rock sawability and its factors especially the physical and mechanical characteristics of rock. To achieve the research goal, a variety of eleven types of hard dimension stone were selected and nine major physical and mechanical characteristics of rock including uniaxial compressive strength, Young’s modulus, Brazilian tensile strength, equivalent quarts content, grain size, Mohs hardness, point load test, density and P-wave velocity of these samples were evaluated. The cutting rate of diamond wire for all of the Workpiece was measured at different pullback amperage with a fully instrumented cutting platform in laboratory. All operational parameters of cutting process were entirely controlled. Thus, a database containing 99 datasets was provided and it has been used for analyses. The obtained results from the pruned and unpruned tree models showed a significant relationship between cutting rate and its factors. In the end, the results of M5P tree method were compared with statistical analyses (i.e., linear and nonlinear regression). The coefficient of determination be equal with 0.92, 0.86, 0.77 and 0.63 for unpruned tree, pruned tree, linear and nonlinear regression method respectively. This comparison showed that the both method of M5P tree technique have a better performance in predicting the cutting rate rather than the statistical regression methods. 相似文献
3.
The sawing rate is one of the most significant and effective parameters in extracting building stones via diamond wire sawing. This parameter designates the capability of diamond wire sawing for sawing different stones; in addition, the parameter gives rise to economical considerations for quarry designers. In this study, the existent relations between stone geotechnical parameters and the sawing rate of stones via diamond wire sawing were analyzed using regression and correlation coefficient as well as the collected data from Marmarit stone quarries. Moreover, we estimated the sawing rate of Marmarit using the dimensional stone rock mass rating (DSRMR); upon comparison of the data obtained from DSRMR our pre‐collected data on quarries, we did not gain satisfactory results from DSRMR, hence we used artificial neural network (ANN). The results showed that the percentage of Silica, the coefficient of water absorption, the uniaxial compressive strength (UCS), and abrasive hardness are the proper parameters for creating the ANN. Discontinuities have the least effects possible on diamond wire sawing. Having given the training possibility of the ANN, and its ability to evaluate relations among input parameters, the ANN, which was being trained with Marmarit's traits, was an accurate network for estimating diamond wire sawing in Marmarit quarries, although it could not generalize this network for other stones such as Chini and Crystal. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
4.
Deniz Tumac 《Rock Mechanics and Rock Engineering》2014,47(2):703-715
Shore hardness has been used to estimate several physical and mechanical properties of rocks over the last few decades. However, the number of researches correlating Shore hardness with rock cutting performance is quite limited. Also, rather limited researches have been carried out on predicting the performance of chain saw machines. This study differs from the previous investigations in the way that Shore hardness values (SH1, SH2, and deformation coefficient) are used to determine the field performance of chain saw machines. The measured Shore hardness values are correlated with the physical and mechanical properties of natural stone samples, cutting parameters (normal force, cutting force, and specific energy) obtained from linear cutting tests in unrelieved cutting mode, and areal net cutting rate of chain saw machines. Two empirical models developed previously are improved for the prediction of the areal net cutting rate of chain saw machines. The first model is based on a revised chain saw penetration index, which uses SH1, machine weight, and useful arm cutting depth as predictors. The second model is based on the power consumed for only cutting the stone, arm thickness, and specific energy as a function of the deformation coefficient. While cutting force has a strong relationship with Shore hardness values, the normal force has a weak or moderate correlation. Uniaxial compressive strength, Cerchar abrasivity index, and density can also be predicted by Shore hardness values. 相似文献
5.
J. Abdollahisharif E. Bakhtavar A. Alipour M. Mokhtarian 《Journal of the Geological Society of India》2012,80(3):420-428
In order to obtain minimum amount of ore wastage and maximum profitability in dimension stone quarries an optimal short-term production planning procedure has been established here according to the market demand. As the base of this procedure geological modelling has been first created and smoothing of ore-body boundaries was done. Then, an economical block model has been provided. In the next step, all probable shapes of minable-blocks were specified and their priorities in assignment were done according to desired size of the blocks by market demand. Finally, searching from a base sub-block was started in order to find the optimal plan. The procedure has been used for a dimension marble quarry located in northwest of Iran. It demonstrates a decrease about 26% of ore wastage and 21.3% of diamond wire assumption with comparing to the existent traditional procedure. 相似文献
6.
真空沉积渗覆法使金刚石表面形成金属碳化物过渡层和化学镀法使金刚石表面生成有良好湿润性的低熔点金刚石过镀层,改善粘结材料对金刚石的粘结状态,提高了粘结强度.通过采用相应的粘结材料和烧结工艺,将金属化金刚石成功地应用于石材切割锯片,取得了提高锯片效率30～100%,寿命延长20%以上的效果. 相似文献
7.
The Effects of Operational Parameters on a Mono-wire Cutting System: Efficiency in Marble Processing
Mono-wire block cutting machines that cut with a diamond wire can be used for squaring natural stone blocks and the slab-cutting process. The efficient use of these machines reduces operating costs by ensuring less diamond wire wear and longer wire life at high speeds. The high investment costs of these machines will lead to their efficient use and reduce production costs by increasing plant efficiency. Therefore, there is a need to investigate the cutting performance parameters of mono-wire cutting machines in terms of rock properties and operating parameters. This study aims to investigate the effects of the wire rotational speed (peripheral speed) and wire descending speed (cutting speed), which are the operating parameters of a mono-wire cutting machine, on unit wear and unit energy, which are the performance parameters in mono-wire cutting. By using the obtained results, cuttability charts for each natural stone were created on the basis of unit wear and unit energy values, cutting optimizations were performed, and the relationships between some physical and mechanical properties of rocks and the optimum cutting parameters obtained as a result of the optimization were investigated. 相似文献
8.
北京有大量采用房山大理岩制造的石质文物,这使得北京大理岩力学性质的研究对于科学指导文物保护和修复具有重要意义。但由于文物本体取样困难,难以获得其力学参数。因此本文对北京大理岩的物理、力学参数进行测试,通过建立物理参数和力学参数的回归方程,实现利用物理参数评价力学参数的目的。以北京大理岩中的青白石和汉白玉为研究对象,对8个边长为150 mm立方体试样进行施密特回弹测试,对40个Ф50 mm×100 mm的圆柱体试样进行里氏硬度、纵波波速测试和单轴压缩试验,得到了大理岩的回弹值、里氏硬度值、纵波波速与单轴抗压强度、弹性模量。分别以单轴抗压强度和弹性模量为因变量,选择单个或两个物理参数作为自变量建立回归方程。通过对比相关系数发现:（1）对于单个物理参数,单轴抗压强度与D探头里氏硬度值的相关性最好,而弹性模量与回弹值的相关性最好;（2）对于两个物理参数,单轴抗压强度（或弹性模量）都与回弹值和D探头里氏硬度值的组合相关性最好。 相似文献
9.
Prediction of specific energy of carbonate rock in industrial stones cutting process 总被引：2，自引：2，他引：0
Specific energy (SE) measurements of circular saws were conducted on 12 different carbonate rocks. Rock samples were collected from the factories for laboratory tests. Bulk density, apparent porosity, uniaxial compressive strength, Brazilian tensile strength, flexural strength, Schmidt rebound hardness, Shore hardness, point load strength index, Los Angeles abrasion values, and P-wave velocity values were determined in the laboratory. SE and rock properties were evaluated using simple regression analysis and empirical equations were developed. The equations were verified by statistical tests. Regression analysis showed that high correlations exist between SE and uniaxial compressive strength, Shore and Schmidt hardness, bulk density, apparent porosity, and flexural strength. It was found that the SE value of rocks in cutting process was highest for those rocks having the high density, compressive strength, flexural strength, Schmidt and Shore hardness, point load strength index, and P-wave velocity values. 相似文献
10.
It is often necessary to locate the original quarry which supplied the stone for a particular historical building. This stones could be used for future restoration work and for testing in the laboratory (artificial aging tests, physical properties determination, control of the efficacy of conservation treatments, etc.). Generally, reviewing historical documentation gives information about the geographical setting of quarries and location of the stones in the monument, but this information needs to be proved by field and laboratory studies. The comparative study of stone from quarries and monuments should basically include the following: (1) mineralogical and petrographical studies; (2) the chemical analysis of major, minor and trace elements; (3)stable isotopes determinations; (4) physical properties of quarry materials and unweathered building stone (water absorption, ultrasound transmission velocity, porosity and porous system, density, bulk density, compressive strength, etc.). This methodology was applied to Málaga Cathedral stones represented in the main façade, towers, and the western zone of the terrace, which, according to historical literature, came from Almayate (Miocene–Pliocene limestones) and Cerro Coronado (Permotriassic sandstone) in Málaga. The conclusion of the comparative study carried out on quarries and building stones was consistent with the information available from the historical documentation. 相似文献
11.
为减小孕镶金刚石切削工具的烧结温度对单晶金刚石性能的影响和改善切削工具胎体性能,降低烧结温度和优选胎体配方材料是很好的解决方法。在切削工具的胎体中加入适量纳米镍粉,通过对制备试样的硬度、强度和耐磨性测试及微观特征分析,综合评价该方法的可行性。结果表明：对于WC基胎体,含有纳米镍粉的胎体较不含纳米镍粉的胎体HRC提高11.9%,抗弯强度提高18.4%,耐磨性提高44.5%;对于Fe基胎体,含有纳米镍粉的胎体较不含纳米镍粉的胎体HRC提高19.5%,抗弯强度提高0.2%,耐磨性提高33.3%。既减小了温度对金刚石的影响,又提高了切削工具整体性能。 相似文献
12.
Fatih Bayram 《Arabian Journal of Geosciences》2013,6(11):4357-4362
Performance analysis of all systems used in industrial production is very important subject in terms of capturing the low production cost. This subject is also important for choosing production methods in natural stone processing. Circular sawing is a commonly used method in natural stone processing. The preliminary prediction of circular sawing performance is very useful for stone producers. In this study, the prediction of sawing performance from some index properties of stones was conducted. The unit wear on diamond segments was evaluated as performance criteria. The statistical analysis was carried out, and this performance parameter was predicted from some index properties including cone indenter hardness, Shore hardness, Böhme surface abrasion, and brittleness. The most suitable prediction equation derived from regression analysis was selected. It was determined that this equation was statistically reliable for prediction of unit wear for natural stone processing. 相似文献
13.
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
14.
R. Singh J. K. Singh T. N. Singh B. B. Dhar 《Geotechnical and Geological Engineering》1995,13(2):63-78
Summary A number of field and laboratory tests have been carried out on more than 15 coal seams of compressive strengths ranging from 19 MPa to 44 MPa to evolve methods which would help in the selection of suitable coaling machines for hard coal seams. The effect of physico-mechanical properties on cuttability were studied in the laboratory for all these coal seams to identify the relevant parameters affecting the specific energy of coal cuttability. These data were subjected to regression analysis to find the best fit for estimation of laboratory specific energy of coal samples on the basis of simple laboratory and field tests for the strength parameters. Field studies were also conducted over a large number of active mechanized coal faces to study in situ cuttability along with the geo-mining conditions of the site. The field and the laboratory data so generated were correlated and an attempt is made to establish a relationship for estimating the field specific energy for a particular capacity of coaling machines by considering the geo-mining domain of the field in totality. 相似文献
15.
为了提高钻进坚硬岩层的工作效率,将孕镶金刚石钻头胎体结构设计为栅格状,分析了栅格状孕镶金刚石钻头钻进岩层时的碎岩方式,并采用粉末冶金法制备Inconel 718和CoCrMo试样,通过分析不同烧结温度对两种胎体试样的硬度、耐磨性及抗弯强度的影响,确定了两种材料的最优烧结参数,并对其在该烧结温度下的力学性能进行对比分析。研究结果表明:Inconel 718和CoCrMo均具有较好的抗弯强度,满足钻进坚硬岩层对胎体抗弯强度的要求。Inconel 718的硬度比传统WC基胎体材料小,试样磨损量较大,适合用于地质灾害应急勘查等要求钻进速度快的极端情况;CoCrMo的硬度及耐磨性与传统WC基胎体接近,适合作为孕镶金刚石钻头的胎体材料。 相似文献
16.
Forestieri Giulia de Buergo Mónica Álvarez 《Geotechnical and Geological Engineering》2021,39(7):5021-5040
Mendicino calcarenite was once widely used in traditional constructions by Italy’s foremost stonemasons’ schools. This paper provides a complete physico-mechanical characterization in order to improve understanding of strength and durability properties and so apply that knowledge to conservation and new construction. Stone samples from three lithofacies are taken from the following quarries of Cosenza province: Scannelle in Malito; Cannataro in Carolei; Albanese in San Lucido. Samples are subjected to: X-ray diffraction, mercury intrusion porosimetry, ultrasonic pulse velocity, capillary water absorption, uniaxial compressive, flexural, point load tests with respect to the X, Y, Z axes. Malito samples exhibit creamy colour, better hydric behaviour, low open porosity, reduced water absorption capability, isotropic hydric behaviour, higher fossil abundance (both in number and size) than the lithofacies taken from Carolei and San Lucido, which exhibit whitish colour, greater strength and more homogeneous texture. The greater compactness of Carolei and San Lucido samples can be ascribed to homogeneity and low porosity and their better mechanical properties to textural features. Anisotropy plays an important role. Placing stone samples along the Z axis prevents water intrusion, and improves mechanical strength. Isotropy and compact and heterogeneous fabric in stones result in higher strength and lower water absorption.
相似文献17.
Monowire block cutting machines can be used for natural stone block squaring and slab cutting operations. The plants where the cutting operations are performed demand high product quality with minimum operational costs. The major parameters affecting the economy of the operation are the energy consumed and the wear induced on the diamond beads during the cutting operation. An efficient cutting operation can only be maintained by selecting proper cutting parameters. Therefore, cutting parameters should be clearly understood. Experimental studies and numerical modeling methods are significant in terms of identifying the energy consumption occurring during natural stone cutting with monowire. Experimental studies and numerical modeling using discrete element method were performed on Afyon White Marble. Experimental studies have been performed by using a specially designed, fully automatic monowire cutting machine, and numerical analyses were carried out by commercially available software called three-dimensional particle flow code (PFC3D). A discrete element model for the cutting operation was developed, and various numerical models were performed for different peripheral speeds and cutting speeds, while, at the same time, the actual cutting operations were being carried out in the laboratory. Finally, the data obtained from the experimental works were compared with the data from numerical modeling. A comparison indicates that the frictional energy values obtained by means of numerical modeling are in good agreement with the results of the laboratory measurements. This study clearly put forward the influences of effective parameters on monowire cutting operations in natural stone industry. Furthermore, it filled an important space in the literature about the use of monowire block squaring machines. 相似文献
18.
19.
镀膜金刚石工具中以Fe代Co的胎体配方的试验研究 总被引：1，自引：0，他引：1
从分析锯切对金刚石圆锯片胎体性能的要求出发,根据金属材料学的基本理论,确定了提高胎体机械性能的微量元素之后,试验研究了胎体主要成分ＷＣ、Ｆｅ／Ｎｉ、６６３－Ｃｕ;烧结工艺参数中的烧结温度和保温时间等５个因素对胎体综合指标的影响,所研制的胎体配方达到了锯切生产的要求 相似文献
20.
This paper presents an experimental study on the sawing of granitic rocks by circular diamond sawblades. The influence of the operating variables and rock properties on the specific energy were initially investigated and analyzed. To determine the most significant operating variables and rock properties influencing the specific energy, statistical analyses were then employed and the models were built for the estimation of specific energy depending on the operating variables and the rock properties. Moreover, the derived models were validated through statistical tests such as the determination coefficient, t-test, F-test, and residuals. The results indicated that the specific energy decreased with the decreasing of peripheral speed and the increasing of traverse speed, cutting depth, and flow rate of cooling fluid, respectively. It was concluded that, rather than the physico-mechanical properties, the mineralogical properties were the dominant rock properties affecting the specific energy. Additionally, the peripheral speed was statistically determined as the most significant operating variable affecting the specific energy. The peripheral speed was followed by the cutting depth, traverse speed, and flow rate of cooling fluid with respect to their level of significance on the specific energy. Furthermore, the model results revealed that the developed models have high potentials as a guidance for practical applications. 相似文献