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| 1 | 基于随机碰撞的GCr15钢强化研磨表面粗糙度数值模拟显示文摘目的探索强化研磨工艺参数对表面粗糙度的影响规律。方法采用小球均布大球模型来模拟研磨粉附着在钢珠表面对工件的强化作用,基于Abaqus/Python建立强化研磨随机碰撞有限元模型,设置不同喷射速度、喷射角度、钢珠直径、喷射时间等工艺参数进行仿真模拟。运用Matlab提取靶材表面形貌,并基于此形貌,沿4种不同路径计算表面粗糙度,分析不同参数下表面粗糙度的变化规律。结果随喷射时间的增加,强化研磨表面粗糙度先增加,后趋于稳定。喷射角度θ为90°,钢珠直径D为0.8mm,喷射速度v分别为30、50、70 m/s条件下,随着喷射时间的增加,表面粗糙度增加至稳定后,分别在1~1.2、1.7~1.9、2~2.5μm波动;喷射速度v为50 m/s,钢珠直径D为0.8mm,喷射角度θ分别为30°、60°、90°条件下,随着喷射时间的增加,表面粗糙度增加至稳定后,分别在1.1~1.3、1.5~1.7、1.7~1.9μm波动;喷射速度v为50 m/s,喷射角度θ为90°,钢珠直径D分别为0.4、0.8、1.2 mm条件下,随着喷射时间的增加,表面粗糙度增加至稳定后,分别在0.7~0.8、1.7~1.9、2.4~2.6μm波动。经过试验验证,发现试验结果与仿真结果平均误差为8.15%。结论强化研磨随机碰撞有限元模型能可靠预测强化研磨工艺下工件的表面粗糙度,可为后续研究提供理论基础。 | 刘晓初 刘镇 梁忠伟 黄建枫 高伟林 萧金瑞 | 2021 | 表面技术2021，50，4： | 3 |
| 2 | 不同回火GCr15轴承钢切削性能的研究显示文摘对GCr15轴承钢在区间温度200℃~800℃实施淬回火试验,并运用AdvantEdge FEM切削仿真软件,通过改变切削参数的方法,对不同回火温度下的GCr15轴承钢进行切削过程模拟研究。结果表明:随着回火温度提高,GCr15轴承钢的硬度、强度都下降明显,塑性和冲击韧性呈上升趋势;淬回火工艺对轴承钢GCr15切削加工性能的改善明显,切削力和切削温度大幅降低;回火温度为700℃时的轴承钢具有较优的切削性能。 | 赵成喜 陈金萍 贾华 | 2019 | 工具技术2019，53，10： | 0 |
| 3 | A comprehensive review on residual stresses in turning显示文摘Residual stresses induced during turning processes can affect thequality and performance of machined products,depending on its direction and magnitude.Residual stresses can be highly detrimental as they can lead to creeping,fatigue,and stress corrosion cracking.The final state of residual stresses in a workpiece depends on its material as well as the cutting-tool configuration such as tool geometry/coating,cooling and wear conditions,and process parameters including the cutting speed,depth-ofcut and feed-rate.However,there have been disagreements in some literatures regarding influences of the abovementioned factors on residual stresses due to different cutting conditions,tool parameters and workpiece materials used in the specific investigations.This review paper categorizes different methods in experimental,numerical and analytical approaches employed for determining induced residual stresses and their relationships with cutting conditions in a turning process.Discussion is presented for the effects of different cutting conditions and parameters on the final residual stresses state. | Ammar H.Elsheikh S.Shanmugan T.Muthuramalingam Amrit Kumar Thakur F.A.Essa Ahmed Mohamed Mahmoud Ibrahim Ahmed O.Mosleh | 2022 | Advances in Manufacturing2022，10，2： | 0 |
| 4 | Failure Mechanisms and Structural Optimization of Shredder Hammer for Metal Scraps显示文摘Recycling retired cars can relieve the environmental pollution and resource waste efficiently.However,a few publications can be found on the failure mechanisms and optimization method of recycling equipment,shredders.Thus,the failure mechanisms and structural optimization of shredder hammers for retired cars are studied aiming improving shredding efficiency and reducing cost.Failure types of shredder hammer are studied theoretically,and it is found that wear failure and fatigue failure are the two main failure types of shredder hammer.The shredding process of metal scraps is analyzed by finite element method,and it can be divided into four stages based on the stress states:initial stage,collision stage,grinding stage and separation stage.It is proved that the shredding efficiency can be improved by increasing cutouts on the hammer head.Finally,it is determined that the hammer with two cutouts is the optimal structure for metal scraps,which can improve the shredding efficiency by 20% and lengthen the hammer life by 15%.This study provides scientific basis for the industry application and theoretical foundation for further research. | ZHOU Xianyan HU Zhili TAO Yijun QIN Xunpeng HUA Lin | 2016 | Chinese Journal of Mechanical Engineering2016，29，4： | 0 |
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