简易侧边翻孔模

<正> 1 制件的工艺分析 图1所示某汽车油泵的吸油腔,08Al材料,厚度为0.8mm。该制件?22.2_0~(0.05)mm和?22_0~(0.05)mm尺寸要求严,?7.85_0~(0.1)mm又属于侧边翻孔,在工艺以及模具方面都具有     

薄钛板的多沟槽铣削

北京化工机械厂在生产从日本引进的离子膜电解槽过程中,主要难点是阳极板的多沟槽铣削加工。阳极板为工业纯钛(TA1),其尺寸为1060mm(长)x310mm(宽)×1mm(厚),板上有宽0.5~(±0.1)mm,深0.3~(±0.1)mm,间距0.5mm的沟槽180条,需用180片铣刀(铣刀     

陶瓷金属复合耐磨材料的制备、组织及性能

将颗粒粒径0.8~3mm的ZrO2增韧Al2O3陶瓷颗粒(ZTA)与自制粘结剂混合均匀后填充至消失模蜂窝状空隙中,采用真空负压一体浇注高铬铸铁金属液铸渗陶瓷颗粒,浇注温度1380~1450℃,制备了陶瓷金属复合耐磨材料。结果表明:ZTA颗粒由粒度0.8~1.2mm、1.8~2.2mm和2.6~3.0mm的颗粒按照1:3:1的体积比例均匀混合构成;ZTA与高铬金属基体界面结合紧密,无缩松、裂纹等缺陷,未因高温金属液体的冲刷发生溃散和漂移;陶瓷金属复合层厚度可达35mm;陶瓷金属复合耐磨材料的耐磨性是高铬铸铁材料耐磨性的2~6倍。     

日本轻金属公司扩大高精N-FLAT铝厚板生产

<正>据日刊《Nalk Reprt》2012年第3期报道,日本轻金属公司(NLM)开发出一种商品名称为"N-FLAT"高精度铝合金(2017.5052、6061)厚板,主要用于制造液晶及半导体制造设备,其板材厚度4.0~100.0mm,主导合金5052,厚度偏差±0.8%~1.0%,厚4.0~12.0mm板材的平直度为0.5mm/m,厚12.0~30.0mm板材的平直度为0.4mm/m,均比一般工业用板材的尺寸偏差严格得多,可供应的板材大小为1000~     

大断面铜包铝棒坯立式连铸成形工艺参数对连铸复合过程影响的数值模拟

以100mm×100mm大断面铜包铝棒坯为对象,建立棒坯连铸复合成形的数值模型,确定模型的边界条件,并通过设计的实验验证数值模型边界条件的准确性。基于验证的边界条件,采用ProCast软件对铜包铝棒坯立式连铸复合成形过程的稳态温度场进行数值模拟,得到了各工艺参数对连铸过程的影响规律,给出了工艺参数的调控策略和合理范围。结果表明,制备100mm×100mm大断面铜包铝铸坯的合理工艺参数范围为:在保持铜液温度1250℃的条件下,铝液铸造温度为760~790℃;一冷水流量为1600~2000L/h;二冷水流量为900~1100 L/h;二冷水距结晶器石墨套出口距离为20 mm;拉坯速度为80~100mm/min。     

大连三高集团有限公司与番禺珠江钢管(连云港)有限公司签订高频直缝焊管生产线供货合同

<正>大连三高集团有限公司(简称三高集团)与番禺珠江钢管(连云港)有限公司于2011年4月11日在广州市签订了Φ711mm(28in)HFW直缝焊管生产线供货合同并正式生效。该Φ711mm HFW生产线的产品规格为:圆管Φ245~711mm×5~25mm,方矩管200mm×200~550mm×550mm,生产周期12个月。该生产线采用了具有三高集团自主知识产权的焊管成型技术,即开口成型部分采用空弯成型与全排辊成型相结合的成型     

特形瓷件陶瓷热压注模的设计

<正> 1 瓷件分析 从图1可知,该零件有它的特殊性。从外形看,3—25±0.1mm精度要求较高,必须分别垂直于内等边三角形各顶角之角平分线(即φ15_0~(+0.1)mm之中心线),各对应面相互平行且等距。3—4.5_0~(+0.05)mm与厚度25+0.1mm要求对称且平行。从内形看,     

绿泥石的球磨特性及其破裂参数

在相同的球磨条件下,对4种窄粒级的绿泥石进行实验室分批湿式球磨试验。结果表明:4种粒级绿泥石的磨矿动力学都遵循一阶磨矿动力学,球磨0.25~0.5 mm的绿泥石时获得最大的破碎速率函数Si=0.35 min~(-1),正常的破碎粒级范围应该小于0.5 mm;在较短的磨矿时间内,0.25~0.5 mm绿泥石的细粒级产出具有明显的零阶产出特征;采用G-H算法获得0.25~0.5 mm粒级绿泥石的累积破碎分布函数Bij,利用磨矿总体平衡动力学模型,对粒级为0.25~0.5 mm的绿泥石进行球磨模拟仿真计算,试验结果与模拟仿真结果高度一致。     

退火温度对TA1冷轧钛板组织与性能的影响

研究退火温度(550~710℃)对厚度0.5和1.0 mm的TA1冷轧钛板的显微组织及力学性能的影响,结果表明,当退火温度较高时,力学性能受退火温度变化影响较小;应将显微组织和晶粒大小作为重点因素来确定退火工艺;对于0.5 mm、1.0 mm的TA1冷轧钛板,适宜退火温度应分别控制在630~670℃、610~650℃。     

450mm热带生产线技术改造中采用的新技术

介绍了近两年来唐山不锈钢有限责任公司通过采用多项创新技术,将450mm热轧带钢生产线成功改造成为600mm新型3/4连轧生产线,产品范围由232~355mm×1·8~8·0mm扩大至232~520mm×1·8~8·0mm。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

THERMODYNAMICS STUDY ON THE DECOMPOSITION OF CHROMITE WITH KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

INFLUENCE OF HEAT TREATMENT ON DAMPING BEHAVIOUR OF THE MAGNESIUM WROUGHT ALLOY AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.     

An Easy Way to Quantify the Adhesion Energy of Nanostructured Cu/X(X=Cr,Ta,Mo,Nb,Zr) Multilayer Films Adherent to Polyimide Substrates

An approach based on film buckling under simple uniaxial tensile testing was utilized in this paper to quantitatively estimate the interfacial energy of the nanostructured multilayer films(NMFs) adherent to flexible substrates. The interfacial energies of polyimide-supported NMFs are determined to be *5.0 J/m2 for Cu/Cr, *4.1 J/m2 for Cu/Ta,*2.8 J/m2 for Cu/Mo, *1.1 J/m2 for Cu/Nb, and *1.2 J/m2 for Cu/Zr NMFs. Furthermore, a linear relationship between the adhesion energy and the interfacial shear strength is clearly demonstrated for the Cu-based NMFs, which is highly indicative of the applicability and reliability of the modified models.     

High-Speed Friction Stir Welding of SiC_p/Al–Mg–Si–Cu Composite

A 17 vol% SiCp/Al–Mg–Si–Cu composite plate with a thickness of 3 mm was successfully friction stir welded(FSWed) at a very high welding speed of 2000 mm/min for the first time. Microstructural observation indicated that the coarsening of the precipitates was greatly inhibited in the heat-affected zone of the FSW joint at high welding speed, due to the significantly reduced peak temperature and duration at high temperature. Therefore, prominent enhancement of the hardness was achieved at the lowest hardness zone of the FSW joint at this high welding speed, which was similar to that of the nugget zone. Furthermore, the ultimate tensile strength of the joint was as high as 369 MPa, which was much higher than that obtained at low welding speed of 100 mm/min(298 MPa). This study provides an effective method to weld aluminum matrix composite with superior quality and high welding efficiency.     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.