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脉冲通风法治理“U”型工作面上隅角瓦斯积聚的理论及技术探讨 总被引:5,自引:0,他引:5
针对生产现场出现的“U”型采煤工作面上隅角瓦斯积聚问题 ,科学地分析了其形成的原因及目前解决上隅角瓦斯积聚的常用方法 ,提出了旋转脉冲法解决此问题的新途径 ,并进行了详细的理论分析。通过现场实验 ,验证了用旋转脉冲法解决上隅角瓦斯积聚是有效的、可行的。 相似文献
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《Journal of Manufacturing Processes》2014,16(2):329-334
This paper presents a novel 3D finite element model for the radial forging process with consideration of mandrel. As different with the previous works, the proposed model captures more accurately the features of the radial forging process. The proposed model is validated. With the proposed model, a comprehensive analysis of the deformation for the tube is presented. The contributions of the present work are: (1) a full 3D finite element model which captures more features of the radial forging process than the models in literature, (2) a proof that a full 3D finite element model is needed, (3) a proof of the effectiveness of the spring bar in stabilizing the contact between the hammer die and work-piece, and (4) the spindle speed has little effect on forging load. Finally, this model can be well used for the analysis and comprehensive understanding of the radial forging process and optimization of the process in future. 相似文献
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此文对工程铲车斗齿套的锻造成形方案进行了定性分析,详细地讨论了锻造成形楔形孔薄壁件的方法,并确定了合理的成形工艺、设备选择和工艺流程。此文作者的研究和实践对解决楔形孔薄壁件的锻造成形问题具有普遍的指导意义。 相似文献