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基于混流生产的农机制造物料配送期量优化研究
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作者 王保森 吕锋 张雷雷 《物流科技》 2024年第13期1-5,共5页
针对传统物料配送方式难以满足农机制造混流生产的问题,提出多品种小批量的物料配送期量优化方法,解决农机制造商仓储中心向线边配送物料过程中存在的配送总成本高、线边库存大、配送不及时等问题。以配送总成本、AGV配送小车装载空置... 针对传统物料配送方式难以满足农机制造混流生产的问题,提出多品种小批量的物料配送期量优化方法,解决农机制造商仓储中心向线边配送物料过程中存在的配送总成本高、线边库存大、配送不及时等问题。以配送总成本、AGV配送小车装载空置率为优化目标,构建了多目标、多频次、小批量物料配送期量优化模型。根据模型决策变量的特征,设计了改进种群初始化生成方法和改进收敛因子的多目标灰狼优化算法,提高了算法寻优和收敛能力。实例验证了模型和算法的可行性和有效性。研究结果表明:较优化前,总配送成本减少21.3%,平均配送间隔期缩短23.4%,减少了库存积压和浪费,实现了多品种物料配送期量优化,有效降低了配送总成本。 展开更多
关键词 农机制造 混流生产 配送期量 线边配送 多目标灰狼优化算法
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Effect of inoculating addition on machinability of gray cast iron 被引量:4
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作者 任凤章 李锋军 +2 位作者 刘伟明 马战红 田保红 《Journal of Rare Earths》 SCIE EI CAS CSCD 2009年第2期294-299,共6页
Gray cast irons were inoculated with FeSi75+RE and FeSi75+Sr inoculants. The changes of apex angle of the drills before and after being used were used to evaluate machinability of gray cast irons. Effect of FeSi75+... Gray cast irons were inoculated with FeSi75+RE and FeSi75+Sr inoculants. The changes of apex angle of the drills before and after being used were used to evaluate machinability of gray cast irons. Effect of FeSi75+RE and FeSi75+Sr inoculants on mechanical properties, machinability and sensibility of gray cast iron used in cylinder block were investigated. Experimental results showed that gray cast iron treated with 60%FeSi75+40% RE inoculants exhibited tensile strength consistently at about 295 MPa along with good hardness and improved metallurgical quality. While gray cast iron inoculated with 20%FeSi75+80% Sr inoculants exhibited the best machinability, the lowest cross-section sensibility and the least microhardness difference. The tool flank wear of the drill increased correspondingly with the increase of the microhardness difference of the matrix, indicating the great effect of homogeneity of the matrix on the machinability of gray cast iron. 展开更多
关键词 gray cast iron compound inoculants MACHINABILITY rnicrohardness difference cross-section sensibility HOMOGENEITY rare earths
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Application of complex inoculants in improving the processability of grey cast iron for cylinder blocks 被引量:1
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作者 LIU Wei-ming REN Feng-zhang +2 位作者 LI Feng-jun LIU Ping TIAN Bao-hong 《China Foundry》 SCIE CAS 2006年第2期96-101,共6页
Effect of several complex inoculants on mechanical properties, process-ability and sensibility of grey cast iron used in cylinder block were investigated. The experimental results showed that the grey cast iron treate... Effect of several complex inoculants on mechanical properties, process-ability and sensibility of grey cast iron used in cylinder block were investigated. The experimental results showed that the grey cast iron treated with 60%FeSi75+40%RE complex inoculants has tensile strength consistently at about 295 MPa along with good hardness and improved metallurgy quality. While the grey cast iron inoculated with 20%FeSi75+80%Sr compound inoculants has the best process-ability, the lowest cross-section sensibility and the least microhardness difference. The wear amount of the drill increases correspondingly with the increase of the microhardness difference of matrix structure, indicating the great effect of homogeneousness of matrix structure in the grey cast iron on the machinability of the grey cast iron. 展开更多
关键词 cylinder block process-ability GREY CAST iron compound INOCULANTS
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Effect of nitrogen addition on microstructure and erosion-corrosion behavior of stainless steel in acidic slurry 被引量:1
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作者 Li Ping Cai Qi zhou Wei Bo kang Li Feng jun 《China Foundry》 SCIE CAS 2009年第3期197-201,共5页
Effect of nitrogen content on the microstructure and erosion-corrosion (E-C) behavior of stainless steel (containing about 25% Cr, 5%-6% Ni, and 1%-2% Mo) was investigated by using optical microscope(OM), potentiodyna... Effect of nitrogen content on the microstructure and erosion-corrosion (E-C) behavior of stainless steel (containing about 25% Cr, 5%-6% Ni, and 1%-2% Mo) was investigated by using optical microscope(OM), potentiodynamic polarization curve and immersion method, a self-made rotating disk apparatus and scanning electron microscopy (SEM) and so on. The results show that with the increase of nitrogen content from 0 (no adding) to 0.485 wt.%, the Cr(eq)/Ni(eq) ratio of the tested materials decreases from 4.14 to 1.23 and the ferrite volume percentage of the steel tested linearly decreases approximately from 90% to 10%. The effect of nitrogen content on polarization behavior of the studied steel was not significant. All the passive current densities (I(p)) and pure corrosion rates (V(c)) of the different N content specimens in the acidic solution (slurry containing 0.1 M H(2)SO(4)+0.06% Cl(-)+0.4% F(-), the simplified zinc hydrometallurgy slurry) are too low and nearly negligible. Whereas the pure erosion rates (V(e)) of the four scenarios of the steels tested (N content, wt.%: N1, no adding; N2, 0.143%; N3, 0.289%; N4, 0485%, respectively) are much higher than their V(c) values. The V(e) values of the tested steels are in the order of N4 > N1 > N3 > N2, at the same time, the total weight loss rates (V(t)) follow the order of N4 > N1 > N3 > N2, too. N2 steel consisting of approximately equal volume fractions of ferrite (alpha) and austenite (gamma) exhibits the most excellent E-C resistance and erosion resistance, while the stainless steels possessing the big difference between alpha phase and gamma phase, such as N1 steel nearly possessing single ferrite or N4 steel nearly possessing single austenite, show poorer E-C resistance and erosion resistance. 展开更多
关键词 nitrogen MICROSTRUCTURE erosion-corrosion (E-C) duplex stainless steels
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Study on Engine Speed Controling System of Industrial Bulldozer
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作者 冯开林 陶明 +2 位作者 杨为民 王世明 陈康宁 《成组技术与生产现代化》 2003年第2期49-52,共4页
The functional range of actiyator of diesel engine used in bulldozer was limited when the load of bulldozer was heavy, inconstancy and in the condition of fine working. For this reason the engine rotary speed controll... The functional range of actiyator of diesel engine used in bulldozer was limited when the load of bulldozer was heavy, inconstancy and in the condition of fine working. For this reason the engine rotary speed controlling system consisted of digital controller and proportional actuator was applied; to meet the needs of high controlling precision requirement the online system identification for the engine rotary speed controlling system was carry out;Based on the result of system identification the control parameter PID was optimized. Test study proved that this engine speed controlling method have an excellent speed controlling performance. 展开更多
关键词 工业推土机 发动机 速度控制系统 PID控制 优化 在线系统辨识
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Multi-Source Underwater DOA Estimation Using PSO-BP Neural Network Based on High-Order Cumulant Optimization
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作者 Haihua Chen Jingyao Zhang +3 位作者 Bin Jiang Xuerong Cui Rongrong Zhou Yucheng Zhang 《China Communications》 SCIE CSCD 2023年第12期212-229,共18页
Due to the complex and changeable environment under water,the performance of traditional DOA estimation algorithms based on mathematical model,such as MUSIC,ESPRIT,etc.,degrades greatly or even some mistakes can be ma... Due to the complex and changeable environment under water,the performance of traditional DOA estimation algorithms based on mathematical model,such as MUSIC,ESPRIT,etc.,degrades greatly or even some mistakes can be made because of the mismatch between algorithm model and actual environment model.In addition,the neural network has the ability of generalization and mapping,it can consider the noise,transmission channel inconsistency and other factors of the objective environment.Therefore,this paper utilizes Back Propagation(BP)neural network as the basic framework of underwater DOA estimation.Furthermore,in order to improve the performance of DOA estimation of BP neural network,the following three improvements are proposed.(1)Aiming at the problem that the weight and threshold of traditional BP neural network converge slowly and easily fall into the local optimal value in the iterative process,PSO-BP-NN based on optimized particle swarm optimization(PSO)algorithm is proposed.(2)The Higher-order cumulant of the received signal is utilized to establish the training model.(3)A BP neural network training method for arbitrary number of sources is proposed.Finally,the effectiveness of the proposed algorithm is proved by comparing with the state-of-the-art algorithms and MUSIC algorithm. 展开更多
关键词 gaussian colored noise higher-order cumulant multiple sources particle swarm optimization(PSO)algorithm PSO-BP neural network
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基于CAE分析的铝合金基座压铸工艺优化设计 被引量:5
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作者 李平 魏建华 +1 位作者 李锋军 赵俊岩 《铸造》 CAS CSCD 北大核心 2018年第5期420-423,共4页
在铝合金基座压铸件开发过程中,利用华铸CAE软件对设计的压铸工艺方案进行充型模拟分析及优化。结果表明,原始方案一个内浇口的金属液充型方式易导致铸件型腔底部和顶部圆筒处出现卷气和夹渣等现象。增设一条辅助内浇口的优化方案充型... 在铝合金基座压铸件开发过程中,利用华铸CAE软件对设计的压铸工艺方案进行充型模拟分析及优化。结果表明,原始方案一个内浇口的金属液充型方式易导致铸件型腔底部和顶部圆筒处出现卷气和夹渣等现象。增设一条辅助内浇口的优化方案充型过程较为合理,可以避免铸件底部和顶部圆筒处出现卷气和夹渣等缺陷。实际生产中铸件的合格率在98%以上。 展开更多
关键词 华铸CAE 铝合金基座 压铸工艺 优化设计
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高硅固溶强化球墨铸铁的试制 被引量:2
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作者 吕乐华 张杰琼 +5 位作者 范随长 许海铎 郭亚辉 王世杰 张毅 蔚磊磊 《铸造技术》 CAS 2021年第9期777-779,共3页
开展了高硅固溶强化球铁的试验试制。结果表明,在其他条件一致的情况下,当硅含量小于3.82%时,材料强度只能达到牌号QT500-14的指标;当硅含量达到4.28%后,材料强度达到牌号QT600-10的指标,并完成了铸件的试制,性能满足牌号QT600-10要求。
关键词 固溶强化 硅含量 材料强度 QT600-10
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铝合金支架压铸浇注溢流系统设计 被引量:2
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作者 李平 宋一辰 +1 位作者 赵俊岩 李锋军 《铸造》 CAS CSCD 北大核心 2018年第7期598-602,共5页
根据铝合金支架压铸件的结构特点,对其进行了浇注溢流系统设计。利用华铸CAE软件模拟了铸件充型和凝固过程,基于模拟结果,在中间增加一条较小的浇道,并在型腔底座最后充型部位附近模体上加开窄小溢流槽。优化工艺生产的支架铸件缺陷明... 根据铝合金支架压铸件的结构特点,对其进行了浇注溢流系统设计。利用华铸CAE软件模拟了铸件充型和凝固过程,基于模拟结果,在中间增加一条较小的浇道,并在型腔底座最后充型部位附近模体上加开窄小溢流槽。优化工艺生产的支架铸件缺陷明显减少,浇注溢流系统的优化设计取得了较好效果。 展开更多
关键词 支架压铸件 浇注溢流系统 数值模拟 铸造缺陷
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一种新型变质剂在灰铸铁中的应用
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作者 吕乐华 许海铎 +2 位作者 张杰琼 郭亚辉 范随长 《铸造技术》 CAS 2021年第7期598-600,共3页
针对缸体强度提高所引起的成本增加、收缩倾向增大等问题,开发了一种新型变质剂来代替部分高熔点稳定碳化物的合金元素。通过性能试验和铸件试验,新型变质剂在保证铸件力学性能的前提下可降低铸件生产成本和收缩倾向。
关键词 变质剂 成本 收缩倾向 力学性能
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不同类别铸铁件石墨畸变的差异
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作者 程俊伟 《现代铸铁》 CAS 2019年第4期41-45,共5页
介绍了不同类别铸铁件石墨形态产生畸变的差异,重点分析了原材料带入的微量元素的影响,并提出了不同类别铸铁件防止石墨畸变的措施,得出以下结论:(1)灰铸铁件的石墨畸变主要与铁液中微量元素Pb有关;(2)球墨铸铁件和蠕墨铸铁件产生石墨... 介绍了不同类别铸铁件石墨形态产生畸变的差异,重点分析了原材料带入的微量元素的影响,并提出了不同类别铸铁件防止石墨畸变的措施,得出以下结论:(1)灰铸铁件的石墨畸变主要与铁液中微量元素Pb有关;(2)球墨铸铁件和蠕墨铸铁件产生石墨畸变的因素相对较多,包括化学成分、温度、壁厚、原材料、球化和孕育处理工艺等;(3)Ti虽然能够扩大蠕墨铸铁件的蠕化处理范围,但对于高蠕化率的铸件,Ti有促进形成片状石墨的风险;(4)采用高纯生铁或生产合成铸铁,可以大量减少原材料带入铁液中的微量元素,延缓球墨铸铁、蠕墨铸铁件产生石墨畸变的时间。 展开更多
关键词 铸铁件 石墨畸变 因素
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人群拥挤碰撞训练系统设计
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作者 刘海生 刘晓雯 +2 位作者 苏海龙 韩丽 韩亚丽 《唐山学院学报》 2022年第3期25-28,53,共5页
人群聚集常见于各类公共场所或大型活动现场,发生碰撞事故的风险随人群拥挤程度的增加而增大。为提升保安等相关人员在人群拥挤碰撞情况下自我防护及引导疏散和实施营救的能力,从而降低拥挤碰撞事故风险,开发了一套供保安等相关人员训... 人群聚集常见于各类公共场所或大型活动现场,发生碰撞事故的风险随人群拥挤程度的增加而增大。为提升保安等相关人员在人群拥挤碰撞情况下自我防护及引导疏散和实施营救的能力,从而降低拥挤碰撞事故风险,开发了一套供保安等相关人员训练使用的人群拥挤碰撞训练系统,通过近似真实地模拟人群拥挤碰撞的不同状态,研究得出不同状态下的碰撞规律。实验证明仿真结果具有合理性。 展开更多
关键词 拥挤碰撞事故 训练系统 拟人沙袋
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铸态高强度高塑性珠光体球墨铸铁的生产(1) 被引量:18
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作者 巩济民 曾艺成 《现代铸铁》 CAS 2021年第2期9-12,共4页
介绍了铸态高强度高塑性珠光体球墨铸铁的定义、特点、国内外研发情况及技术难点,详细阐述了生产此种球墨铸铁的要求以及应该采取的措施。最后指出:要想生产出铸态高强度高塑性珠光体球墨铸铁,需要在生产优质球墨铸铁的基础上,根据牌号... 介绍了铸态高强度高塑性珠光体球墨铸铁的定义、特点、国内外研发情况及技术难点,详细阐述了生产此种球墨铸铁的要求以及应该采取的措施。最后指出:要想生产出铸态高强度高塑性珠光体球墨铸铁,需要在生产优质球墨铸铁的基础上,根据牌号要求和铸件特点,确定基体组织中的铁素体体积分数,再在化学成分设计、铁液净化、合金化、铸型冷却速度等方面采取有效的强化措施,最终保证性能要求。除此之外,建议企业在质量管理上下功夫,确保生产出质量稳定、用户满意的铸件,并且与相关设计部门合作,对铸件的结构进行优化和铸件集成,这样轻量化的效果会更加明显。 展开更多
关键词 球墨铸铁 铸态 高强度 高塑性
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20CrMnTi钢拖拉机动力输出轴的断裂失效分析 被引量:5
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作者 李欣然 李英 +2 位作者 宋一辰 李平 李锋军 《铸造技术》 CAS 2020年第11期1074-1076,共3页
某拖拉机在田间旋耕作业时,其动力输出轴发生断裂现象。通过断口形貌、化学成分、金相组织与硬度等方面进行综合分析,以探索动力输出轴失效原因。结果表明,动力输出轴的化学成分、金相组织和硬度均符合技术要求,断口中有少量夹杂物;断... 某拖拉机在田间旋耕作业时,其动力输出轴发生断裂现象。通过断口形貌、化学成分、金相组织与硬度等方面进行综合分析,以探索动力输出轴失效原因。结果表明,动力输出轴的化学成分、金相组织和硬度均符合技术要求,断口中有少量夹杂物;断裂位置为轴头花键和齿轮之间的变径光轴处,断口形貌呈现棘轮花样,为多源扭转疲劳断裂;裂纹源沿台阶方式在轴断面扩展,在交变扭转载荷的反复作用下,由于应力集中而导致断裂。 展开更多
关键词 拖拉机 20CRMNTI钢 动力输出轴 断裂失效分析
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铸态高强度高塑性珠光体球墨铸铁的生产(2) 被引量:10
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作者 巩济民 曾艺成 《现代铸铁》 CAS 2021年第3期9-13,共5页
介绍了铸态高强度高塑性珠光体球墨铸铁的定义、特点、国内外研发情况及技术难点,详细阐述了生产此种球墨铸铁的要求以及应该采取的措施。最后指出:要想生产出铸态高强度高塑性珠光体球墨铸铁,需要在生产优质球墨铸铁的基础上,根据牌号... 介绍了铸态高强度高塑性珠光体球墨铸铁的定义、特点、国内外研发情况及技术难点,详细阐述了生产此种球墨铸铁的要求以及应该采取的措施。最后指出:要想生产出铸态高强度高塑性珠光体球墨铸铁,需要在生产优质球墨铸铁的基础上,根据牌号要求和铸件特点,确定基体组织中的铁素体体积分数,再在化学成分设计、铁液净化、合金化、铸型冷却速度等方面采取有效的强化措施,最终保证性能要求。除此之外,建议企业在质量管理上下功夫,确保生产出质量稳定、用户满意的铸件,并且与相关设计部门合作,对铸件的结构进行优化和铸件集成,这样轻量化的效果会更加明显。 展开更多
关键词 球墨铸铁 铸态 高强度 高塑性
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Fracture analysis of chilled cast iron camshaft 被引量:2
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作者 Li Ping Li Fengjun +1 位作者 Cai Anke Wei Bokang 《China Foundry》 SCIE CAS 2009年第2期104-108,共5页
The fracture of a camshaft made of chilled cast iron, installed in a home-made Fukang car, happened only after running over a distance of 6,200 km. The fractured camshaft was received to conduct a series of failure an... The fracture of a camshaft made of chilled cast iron, installed in a home-made Fukang car, happened only after running over a distance of 6,200 km. The fractured camshaft was received to conduct a series of failure analyses using visual inspection, SEM observation of fracture section, microstructure analysis, chemical composition analysis and hardness examination and so on, while those of CKD camshaft made by Citroen Company in France was also simultaneously analyzed to compare the difference between them. The results showed that the fracture of the camshaft mainly results from white section in macrostructure and Ledeburite in microstructure; the crack in the fractured camshaft should be recognized to initiate at the boundary of coarser needle-like carbide and matrix, and then propagate through the transverse section. At the same tide, the casting defects such as dendritic shrinkage, accumulated inclusion and initiated crack and abnormal external force might stimulate the fracture of camshaft as well. Based on failure analysis, some measures have been employed, and as a result, the fracture of home-made camshafts has been effectively prevented. 展开更多
关键词 CAMSHAFT CAR chilled cast iron FRACTURE LEDEBURITE
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消失模球铁半轴壳体缩孔缺陷的分析与克服
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作者 于继峰 李宗亮 +2 位作者 何帅伟 轩世成 都永杰 《成组技术与生产现代化》 2022年第2期51-53,共3页
为了解决消失模铸造方式生产球铁半轴壳体过程中出现的缩孔缺陷,对生产过程中球铁半轴壳体的生产工艺进行改进。采用合理的顶浇工艺,实现以浇代冒在消失模铸造生产球铁半轴壳体上的应用,有效解决缩孔问题,显著地提升了球铁半轴壳体的成... 为了解决消失模铸造方式生产球铁半轴壳体过程中出现的缩孔缺陷,对生产过程中球铁半轴壳体的生产工艺进行改进。采用合理的顶浇工艺,实现以浇代冒在消失模铸造生产球铁半轴壳体上的应用,有效解决缩孔问题,显著地提升了球铁半轴壳体的成品率。 展开更多
关键词 球墨铸铁 缩孔 消失模铸造
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机械传动机构的改造方案及探讨
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作者 岳振峰 谢鹏鹏 仝锐博 《农业技术与装备》 2020年第1期5-6,共2页
文章介绍了卧式刨台镗工作台丝杠机构、拖拉机底盘磨合试验台离合机构的维修实例。通过改变传动受力点的位置或在原结构上进行扩容的方式,以达到快速修复成线设备,降低设备修理复杂程度,节约修理时间保证生产节拍的良好效果。
关键词 生产线设备 结构改进 应急替代改造
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Investigation on Normal Dynamic Contact Characteristics of Mechanical Interface of Machine Tools
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作者 Zhiqiang Gao Weiping Fu +3 位作者 Wen Wang Shuangqi Wang Dongya Zhang Zhifei Xue 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2021年第1期104-123,共20页
The dynamic contact characteristics of mechanical interface significantly impact the performance of machine tools.The static contact behaviors of mechanical interface have been studied.However,most mechanical interfac... The dynamic contact characteristics of mechanical interface significantly impact the performance of machine tools.The static contact behaviors of mechanical interface have been studied.However,most mechanical interfaces are exposed to dynamic load.It is necessary to study the dynamic contact characteristics of mechanical interface.A normal dynamic microcosmic contact model is built using the statistical method,and the interactional effects of adjacent asperities are considered.The influences of the normal preload,vibrational frequency and displacement amplitude on normal contact stiffness and damping of mechanical interface are revealed.The predicted contact stiffness and damping of mechanical interface are verified by a series of simulations and experiments. 展开更多
关键词 Dynamic STIFFNESS DAMPING Asperity interaction EXPERIMENT
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基于CAE分析的过滤器底座压铸工艺优化设计 被引量:1
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作者 李平 李英 李锋军 《特种铸造及有色合金》 CAS 北大核心 2019年第8期870-872,共3页
根据过滤器底座压铸件的结构特点,进行了压铸工艺设计。利用Pro/E软件对过滤器底座进行实体造型,应用华铸CAE软件模拟了铸件的充型过程。结果表明,初始方案单浇口的金属液充型方式容易造成铸件法兰盘左下角出现卷气和夹杂物缺陷。增加... 根据过滤器底座压铸件的结构特点,进行了压铸工艺设计。利用Pro/E软件对过滤器底座进行实体造型,应用华铸CAE软件模拟了铸件的充型过程。结果表明,初始方案单浇口的金属液充型方式容易造成铸件法兰盘左下角出现卷气和夹杂物缺陷。增加辅助浇口使充型过程更加平稳、均匀,铸件缺陷得到有效控制。用优化工艺方案进行生产,发现过滤器底座铸件的气孔和夹渣缺陷减少,验证了模拟结果的正确性。 展开更多
关键词 过滤器底座 压铸工艺 CAE模拟 优化设计
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