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排序方式: 共有123条查询结果,搜索用时 14 毫秒
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介绍了鲁中冶金矿山公司选矿厂设计和建设的全过程,以及从1985年9月建成投产至今的10年生产实践,表明该厂的建设前期准备工作及选矿流程设计是正确的,从而使该厂取得了较好的生产技术指标和经济效益。 相似文献
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A new mathematical model of the dressing of grinding wheels by diamond disc dresser is developed. It predicts the dressing forces between the diamond grits of a rotating disc dresser and the grits of an alumina grinding wheel. This model is based on the fracture of grits, the fracture of the bond and the contact forces between the dresser and grits. It considers the kinematical influences and in particular speed ratio of the dressing process. Also a Weibull distribution was used to predict the probability of bond fracture. Dressing forces are measured experimentally and are compared with those calculated from the new model. Theoretical results closely match with the experimental findings. The dressing forces generated from this model provide a basis for further prediction of wheel topography and the grinding process. 相似文献
55.
Dressing process model for vitrified bonded grinding wheels 总被引:1,自引:0,他引:1
B. Linke 《CIRP Annals》2008,57(1):345-348
A holistic dressing process model for vitrified bonded grinding wheels was designed. It regards the dressing process as a tribological system subjected to a complex load collective. The intensive analysis of the input variables and their impact on the system function led to new knowledge about the acting mechanisms. The model enables a qualitative prognosis of the grinding wheel topography, the dressing forces and the thermal dressing process load. 相似文献
56.
Eraldo Jannone da Silva João Fernando Gomes de Oliveira Bruno Barbosa Salles Ricardo Santoro Cardoso Vinicius Ricco Alves Reis 《CIRP Annals》2013,62(1):355-358
The functionalization of surfaces by introducing pre-engineered textures is a new requirement from industry. Surfaces more prone to promote micro-lubrication are being designed by engineers and incorporated into the components specification. The major challenge is to develop manufacturing methods able to produce these textures in a repeatable and economically viable way. The aim of this research work is to develop grinding strategies based on the method proposed in [1] for producing textured surfaces by grinding. The characteristics of the produced textures are measured and evaluated using new proposed parameters. The obtained results show the potential of this process solution for the production of micro pockets for hydrodynamic bearings application. 相似文献
57.
Cylindrical surfaces are increasingly utilized in various areas, and related high-efficiency and high-quality fabricating technologies are of great importance and significant benefit to modern industry. To provide fundamental knowledge for the bearing industry, studies have been conducted on the use of cast-iron-bonded cubic boron nitride (cBN) superabrasive wheels, based on electrolytic in-process dressing (ELID) technique for realizing high-efficiency grinding of steel cylindrical workpieces. Therefore, in this investigation, experiments were carried out on an ordinary cylindrical grinder with a hydrodynamic spindle, and straight type grinding wheels of different grit sizes were used. The effects of grit sizes on surface roughness as well as waviness, roundness, and surface stress were evaluated in both the traverse and plunge grinding modes. Comparison of ELID grinding with other processes was also carried out. Mirror surface grinding of different materials was achieved with the #4000 CIB-cBN wheel. ELID grinding was confirmed to induce compressive stress and to be more cost effective for small batch production of larger components when it works in the traverse mode. 相似文献
58.
Pei-Lum Tso Shuo-Young Ho 《The International Journal of Advanced Manufacturing Technology》2007,33(7-8):720-724
The primary consumables in the chemical mechanical polishing (CMP) process are the polishing pad and the slurry. Among those
consumables, the polishing pad significantly influences the stability of the process and the cost of consumables (CoC). Furthermore,
the small holes on the pad surface will be filled by the reactant from the CMP process, and the surface of the pad will deposit
hard glazing gradually. The glazing not only reduces the ability of absorbing slurry of the pad, but it also causes scratching
on the work piece. In order to maintain the stability of the CMP process and return to an ideal pad surface status, we must
condition the pad according to a regular time schedule. At the same time, if we use different pad conditioning factors, the
dressing rate of the CMP pad will be different. Most important of all, we have to decrease the pad material abrasion due to
the pad conditioning process. In conclusion, if we can understand the influence of the dressing rate and conditioning factors
effectively, it will be useful for maintaining CMP process stability, extending pad life, and reducing CoC and non-processing
time. 相似文献
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