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含碳含硅较高的中锰铸钢是一种可用于制造锤头的耐磨铸钢,破碎白云石时,此种钢制作的锤头的单耗为7.1g/t,而高锰钢制作的锤头单耗为17.4g/t。中锰耐磨铸钢属脆性材料,在非强烈冲击条件下使用,是高锰钢耐磨性的2.45倍,适用于破碎中低硬度的矿石。文中介绍了中锰铸钢的成分、生产工艺、热处理过程和机械性能。 相似文献
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Static indentation and unloading response of sandwich beams 总被引:1,自引:0,他引:1
This paper deals with analysis of foam core sandwich beams subject to static indentation and subsequent unloading (removal of load). Sandwich beams are assumed continuously supported by a rigid platen to eliminate global bending. An analytical model is presented assuming an elastic-perfectly plastic compressive behaviour of the foam core. An elastic part of indentation response is described using the Winkler foundation model. Upon removal of the load, an elastic unloading response of the foam core is assumed. Also, finite element (FE) analysis of static indentation and unloading of sandwich beams is performed using the FE code ABAQUS. The foam core is modelled using the crushable foam material model. To obtain input data for the analytical model and to calibrate the crushable foam model in FE analysis, the response of the foam core is experimentally characterized in uniaxial compression, up to densification, with subsequent unloading and tension until tensile fracture. Both models can predict load–displacement response of sandwich beams under static indentation and a residual dent magnitude in the face sheet after unloading along with residual strain levels in the foam core at the unloaded equilibrium state. The analytical and FE analyses are experimentally verified through static indentation tests of composite sandwich beams with two different foam cores. The load–displacement response, size of a crushed core zone and the depth of a residual dent are measured in the testing. A digital speckle photography technique is also used in the indentation tests in order to measure the strain levels in the crushed core zone. The experimental results are in good agreement with the analytical and FE analyses. 相似文献
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焦家金矿破碎机腔型改造的实践 总被引:4,自引:0,他引:4
介绍了焦家金矿颚式破碎机、标准圆锥破碎机和短头圆锥破碎机的腔型改造 ,使最终破碎产品中 - 1 4mm ( 2 5mm以下均为圆孔筛粒度 )含量从 73 2 8%增加到80 1 0 % ,使磨矿能力提高了 5 73% ,实现了多碎少磨 ;同时 ,颚式破碎机和短头圆锥破碎机衬板寿命延长到原来的 1 5~ 2 0倍。 相似文献
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金属矿山地下开采中能耗的30%~60%与岩体破碎有关,因此,诱导地压自行破岩逐渐成为矿业届研究的热点。诱导冒落法和自然崩落法是目前最具代表性的利用诱导破岩的采矿方法。介绍了两者的发展现状和工艺特点,分析了诱导破岩机理和诱导破岩方法称谓的合理性,揭示了采准工程量大、开采风险高的工艺特点和认知程度低及理论研究不深入是诱导破岩采矿法得不到推广应用的主要原因,并指出诱导条件下矿岩时空演化规律、出矿管理对冒落速度和冒落部位的调控作用、冒落块度的控制技术以及丰富多元化的研究手段是发展诱导冒落法亟需解决的关键问题。对解决诱导冒落法目前存在的问题、完善诱导破岩理论,具有重要指引作用。 相似文献
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HP700型圆锥破碎机具有优良的性能,增大了偏心距,加快了轴转速,采用曲线型(非阻塞型)破碎腔,从而在破碎腔内只需较低破碎力,在调军台选厂的初步实践达到了较好的效果。 相似文献
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Breaking and disintegrating of biomass compacts while they are being dried in superheated steam (SS) is a common problem observed during the initial stage of SS drying. The present work investigated the moisture and temperature changes, volume and density variation, crushing resistance, and tensile strength of single cylindrical compacts produced from wet distiller's spent grain (WDG) under SS drying conditions. The wet compacts were dried in SS at 110, 130, and 150°C with SS velocities of 0.9, 1.1, and 1.4 m/s. For a specific temperature and velocity, the compacts were exposed to SS for time periods of 5, 120, 300, and 600 s and the changes in physical properties were analyzed. An increase in a percentage increase in volume by 78–130% and a decrease in density by 51–61% were observed as a result of drying the compact in SS. The results obtained from the study were compared with hot-air dried compacts for 600 s, indicating that SS drying had a substantial role in stimulating the relaxation of stresses stored in the compacts as compared with a convection hot-air drying process. 相似文献
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《Journal of the European Ceramic Society》2014,34(5):1341-1351
Carbon steel fibre reinforced lightweight aggregates (LWA) were produced in a pilot scale rotary kiln. Narrow size fractions as well as not-sieved (as received) material were investigated according to European standards with a main focus on strength and density and compared to a reference material without fibres. Depending on the size of the pellets a fraction of the fibres oxidized during firing. A strength increase proportional to the amount of non-oxidized fibres within the pellet was observed. The crushing resistance for as received fibre reinforced pellets (bulk density 452 kg/m3) was 3.0 MPa corresponding to an increase in strength of 140%. The enhanced strength was also confirmed by the single pellet compression test. 相似文献