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分析了车灯产品在生产过程中产生缺陷的原因,运用Moldflow进行熔接线、翘曲和冷却系统的模拟。根据模拟结果,优化了产品,避免了缺陷的产生。通过总结生产实践经验,在生产工艺、产品设计及模具设计各方面提出解决车灯产品的缺陷方法,有效地减少了产品缺陷,提高了产品质量和生产效率。 相似文献
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《中国铸造装备与技术》2017,(2)
阐述了中车齐齐哈尔车辆有限公司通过对传统铸造自硬砂造型生产系统的研究,分析其存在的问题及瓶颈环节,研制出两种新型的铸造造型生产系统,并在实际生产中进行了应用,大幅提高了铸造造型生产系统的生产效率,提高了产品品质,并在一定程度上降低了设备购置费用和产品的生产成本。 相似文献
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针对大型定子的多层硅钢片焊接,采用2 000 W光纤激光器配合机器人进行焊接系统设计。焊接系统主要由机器人、焊接接头组件、夹具组件、变位机等部分组成。为防止产品在激光焊接过程中产生变形,设计了专业夹具对产品进行横向及纵向夹紧。由于产品直径较大(直径780 mm),设计变位机带动产品转动,同时配合机器人焊接,提高焊接效率。实际生产验证结果表明,该系统生产的产品达到要求,且生产效率大于1 pcs/min。 相似文献
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电视机前壳气体辅助注射模设计 总被引:4,自引:3,他引:1
分析了电视机前壳塑件的成型工艺,阐述了电视机前壳注射模结构设计要点与工作过程,通过采用气体辅助注射成型工艺,解决和消除产品表面缩痕问题,提高模具的使用寿命和缩短产品生产成型周期,提高生产效率。 相似文献
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为降低高速轴向柱塞的空化程度,以某型号轴向柱塞泵为例,利用Pumplinx软件搭建CFD仿真模型,探究不同转速与不同吸油口压力对泵空化程度的影响,并结合MATLAB软件对离散的仿真结果进行拟合,得到转速、吸油口压力与吸油效率的变化规律曲线。研究结果表明:当柱塞腔内气体体积达到12% 以上,柱塞泵吸油效率下降甚至无法吸油;通过提高吸油口压力可以有效降低柱塞腔的空化程度,提高柱塞泵吸油效率;为了保证泵在5 000~6 000 r/min下能够正常吸油且有较高的吸油效率,可以使吸油口压力值介于0.25~0.30 MPa之间,此时柱塞腔空化程度和吸油效率均达到相对稳定。 相似文献
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胞状AlCu5Mn合金泡沫的压缩性能和能量吸收特性 总被引:2,自引:0,他引:2
用熔体发泡法制备孔隙率为51.5%~90.5%、孔结构均匀的胞状铝合金(AlCu5Mn),研究其孔结构、压缩性能、能量吸收能力、能量吸收效率和吸能性能.结果表明:胞状铝合金孔结构由高孔隙率(88.8%)时的大孔径、多边形孔向低孔隙率(62.5%)时的小孔径、球形孔孔结构过渡,其压缩应力(σ)-应变(ε)曲线具有线性变形阶段、屈服平台阶段和致密化阶段三个部分,由线性变形阶段进入屈服平台阶段所对应的ε_s值介于2%~9%之间;屈服强度σ_s~*随着孔隙率的增大而下降,在孔隙率相同的条件下,胞状铝合金的力学性能优于胞状铝和多孔铝合金,其比刚度高于钢;当应变为定值时,胞状铝合金单位体积和单位质量的压缩吸能能力(C和C_m)都随着孔隙率的升高而降低,但是孔隙率在73.5%~82.1%范围内时,其C_m与ε的关系几乎不随孔隙率的改变而改变;对于孔隙率为51.5%~90.5%的胞状铝合金,它们的吸能效率的峰值都大于80%.胞状铝合金的C-σ和C_m-σ关系可以表征其吸能性能,从而可以根据实际工况选择作为减振吸能材料的胞状铝合金的最佳孔结构. 相似文献
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真空渗流法制备泡沫铝及其动态力学性能的研究 总被引:2,自引:0,他引:2
以真空渗流法制备陶瓷中空球泡沫铝,研究了应变率对吸能量和吸能效率的影响、相对密度对屈服强度的影响,并与普通泡沫铝进行比较。结果表明,工艺简单可行,所制备的泡沫铝的动态压缩应力-应变曲线只有弹性变形区和塑性变形区;随应变率的增大,屈服强度和吸能效率变化规律不明显,吸能量增大;随相对密度的增大,屈服强度增大,吸能量增大,吸能效率也增大;动态压缩时两种泡沫铝的吸能效率均较高,最大吸能效率大于0.9,是良好的吸能材料。 相似文献
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The isoxazolidines: a new class of corrosion inhibitors of mild steel in acidic medium 总被引:2,自引:0,他引:2
The cycloaddition of the cyclic nitrone-1-pyrroline-1-oxide with a variety of alkenes, phenyl isocyanate and phenyl isothiocyanate afforded a multitude of cycloaddition products (isoxazolidines). One of the cycloadducts on reaction with benzyl and propargyl chloride gave quaternary ammonium salts. All these new isoxazolidines are tested for corrosion inhibition of mild steel in 1 M HCl at 60 °C by gravimetric and electrochemical methods.The inhibition efficiency of this class of compounds are determined for the first time. All compounds have shown excellent corrosion inhibition efficiency (IE%) in acidic solution; IE% in the range 86.7-99.5 are measured by the gravimetric method. Comparable results were obtained by the electrochemical method using Tafel plots for the inhibition efficiency of some of the selected synthesized compounds. 相似文献
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Oswald N.C. Uwakweh Vinod S. Agarwala 《Journal of Materials Engineering and Performance》2008,17(4):561-565
Room temperature hydrogen charging by cathodic polarization of cold rolled AISI 321SS austenitic stainless steel in appropriate
electrolytic medium leads to its decomposition to structural defects and a ferromagnetic α′-martensitic phase. The degree
of decomposition, and hence the resulting products depends on hydrogen charging time with martensitic transformation yielding
up to 14-22% martensite for charging periods of 30 and 96 h, respectively. Based on M?ssbauer spectroscopy measurements, the
magnetically split portion of the spectra corresponding to the α′-martensite phase was resolved in terms of one Fe-site with
internal magnetic field in the range of 260-265 ± 10 kOe. Both the uncharged and retained (after hydrogen charging) austenitic
phases were resolved similarly at ambient and sub-ambient cryogenic temperatures. The austenitic phase in both the uncharged
and charged states remained stable from ambient down to 4.2 K, where they exhibited singlet broadening suggesting weakly ferro/antifero-magnetic
ordering. 相似文献
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M. Morioka 《CIRP Annals》2010,59(1):9-12
In manufacturing, where the wages of operators are high and the availability of expert operators remains limited, it is proving impossible to improve the efficiency of cell production assembly systems. Even novice operators are asked to achieve high levels of productivity and reliability with a diverse range of products. To satisfy this demand, the authors have developed a new cell production assembly system with human-robot cooperation. This system consists of three key technologies; parts feeding by double manipulators on a mobile base, production process information support for the operator, and safety management for cooperation between the operator and the robot. 相似文献
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H. W. Paxton I. J. Bear 《JOM Journal of the Minerals, Metals and Materials Society》1955,7(9):989-994
Studies have been made of the method of propagation of yield in iron single crystals in the range of 205° to 295°K by microscopic and X-ray techniques. The results show yielding in two stages, of which the second corresponds closely to the Lüders extension in polycrystalline iron. 相似文献
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对采用白云石作为发泡剂、SiC作为增粘剂制备的泡沫镁合金进行了微观表征和压缩测试,考察了SiC加入量对泡沫镁合金压缩性能和吸能性能的影响。结果表明,白云石作为发泡剂,在泡沫镁合金制备过程中并不能完全分解,未分解白云石及其分解和反应产物在孔壁处基本均匀分布,在内孔边缘局部聚集;增粘剂SiC在泡沫镁合金中以颗粒物的形式存在,主要聚集于内孔边缘及孔壁组织晶界位置。SiC含量在5%~20%内时,随着SiC加入量的增加,泡沫镁合金的密度、压缩平台应力和单位体积内吸收的能量均呈现出先减小后增大的趋势,转折点SiC含量为10%。在应变量为0~1内,泡沫镁合金的能量吸收效率随着应变量的增加先迅速升高,随后在一定范围内波动,最后迅速下降,波动范围为0.1~0.6。SiC加入量对泡沫镁合金能量吸收效率的影响规律不明显。 相似文献