对QJ系列减速器的分析应用

本文介绍ＱＪ系列减速器的结构形式、技术参数以及系列的特点。对技术参数、制造工艺及精度等进行了分析，并与ＪＺＱ型减速器进行了对比，说明新系列的合理性、可靠性及先进性。     

21世纪以来贝氏体钢的研究开发与应用

介绍了21世纪以来国内外贝氏体钢研究开发的现状,分类介绍了Mo-B系列,Mn-B系列,Si-Mn-Mo准贝氏体钢系列,低碳、超低碳贝氏体钢系列,贝氏体复相钢系列等,以及相关钢种在生产领域中的研制开发与应用.     

热过载继电器热双系统的制作工艺与设计分析

本文以JR2 0系列热过载继电器为例 ,对热过载继电器热双系统的设计作了初步分析 ,指出了在制作过程中应注意的问题 ,介绍了提高产品质量的方法。主要包括主双金属片的布置、热双系统的热量利用率 ,以及焊接、热处理工艺等。本文虽仅以JR2 0系列热过载继电器为例 ,但对于 3UA、JRS2等系列热过载继电器同样具有借鉴意义     

数字化系列砂箱的设计和制作

介绍了系列砂箱的特点,详细阐述了三维数字化系列砂箱的设计和制作方法,运用SolidWorks软件设计了三维砂箱的参数化模板,通过系列砂箱设计表设定的数据,以线性阵列的形式对砂箱模板中箱带、加强筋等特征进行叠加重合或展开,解决了砂箱局部特征数量不同的问题,建立了系列砂箱标准件库,对砂箱进行了优化设计,提高了砂箱刚度。通过三维砂箱仿真模拟,有助于砂箱仓库的合理摆放,调控生产现场砂箱存放空间,优化生产计划安排。     

Mo含量对耐火建筑钢组织及性能的影响

采用金相显微镜、扫描电镜、透射电镜、万能试验机和冲击试验等法表征了耐火钢的组织和性能。结果表明,0.18Mo+B系列耐火钢主要为等轴或块状铁素体和小岛组成,先共析铁素体含量较少;0.30Mo系列耐火钢组织主要为大量等轴或块状先共析铁素体。0.18Mo+B系列耐火钢室温强度高于0.36 Mo,韧性低于0.36Mo。Nb元素对耐火钢强化效果优于V元素,V元素对耐火钢的韧性提高影响较大。     

合锻四个产品通过省级科技鉴定

2006年10月29日，安徽省科技厅主持对合锻开发的YH61—630快速热挤压液压机、YH25车门包边液压机及自动换模系列、YH73系列热压成型液压机、RZU1000快速深拉伸液压机系列项目进行了省级科技成果暨新产品鉴定。鉴定委员会的7名专家首先听取了产品研制报告、产品检验报告和用户意见报告等，并分组进行了资料审查。     

正泰电器科技创新结硕果 “N”系列产品——NM8系列塑料外壳式断路器

正泰电器坚持走自主创新的道路,取得了丰硕的成果,陆续成功地开发了NB1系列小型断路器、NRE8系列电子式过载继电器、NM6、NM8系列塑壳式断路器、NA1、NA8智能型万能式断路器等一批具有国际先进水平的＂N＂系列新产品,这些新产品都拥有自主知识产权，形成了正泰电器自己的产品特色，提升了正泰电器市场竞争能力，使正泰逐步走向中高端市场。     

QR32系列履带式抛丸清理机

QR32系列履带式抛丸清理机适用于小型铸件、锻件等表面清理.文章介绍了QR32系列履带式抛丸清理机的工作原理、技术参数、结构组成与结构特点.QR32系列履带式抛丸清理机具有结构合理、耗能小、清理效果好等优点,适用于不同的生产规模,既可单机使用,也可多台联用.     

多系列铝合金电弧增材制造技术研究进展

电弧增材制造技术适用于铝合金大型复杂构件的一体化成形制造，当前国内外学者已针对不同系列的铝合金进行了大量研究。梳理了近年来铝合金电弧增材制造技术的相关研究，总结了针对Al-Cu、Al-Mg、Al-Si、Al-Cu-Mg、Al-Mg-Si和Al-Zn-Mg-Cu多个系列铝合金的电弧增材研究进展，包括各系列铝合金的组织性能特点、成形效果等方面的研究成果。介绍了铝合金电弧增材制造中常见的组织缺陷，如电弧增材铝合金组织中的孔洞、热裂纹等，以及采用合适的工艺参数和合金设计等解决办法。通过对不同系列铝合金的增材现状和组织缺陷的分析，为铝合金电弧增材制造技术的进一步发展提供了有益的参考。     

自控远红外焊条烘干箱常见故障及排除

一、前言焊接生产中使用的烘干箱品种很多,常见的有101系列、202系列、YHX系列、DH系列、ZYH系列等。其中101、202系列是利用电阻丝的加热作用工作的,而后几个系列的烘干箱则     

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.     

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.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

Using Finite Element and Contour Method to Evaluate Residual Stress in Thick Ti-6Al-4V Alloy Welded by Electron Beam Welding

This work was to reveal the residual stress profile in electron beam welded Ti-6Al-4V alloy plates(50 mm thick) by using finite element and contour measurement methods.A three-dimensional finite element model of 50-mmthick titanium component was proposed,in which a column–cone combined heat source model was used to simulate the temperature field and a thermo-elastic–plastic model to analyze residual stress in a weld joint based on ABAQUS software.Considering the uncertainty of welding simulation,the computation was calibrated by experimental data of contour measurement method.Both test and simulated results show that residual stresses on the surface and inside the weld zone are significantly different and present a narrow and large gradient feature in the weld joint.The peak tensile stress exceeds the yield strength of base materials inside weld,which are distinctly different from residual stress of the thin Ti-6Al-4V alloy plates presented in references before.     

Microstructures and Tensile Properties of Ultrafine-Grained Ni–(1–3.5) wt% SiC_(NP) Composites Prepared by a Powder Metallurgy Route

Silicon carbide nanoparticle-reinforced nickel-based composites(Ni–Si CNP),with a Si CNPcontent ranged from1 to 3.5 wt%,were prepared using mechanical alloying and spark plasma sintering.In addition,unreinforced pure nickel samples were also prepared for comparative purposes.To characterize the microstructural properties of both the unreinforced pure nickel and the Ni–Si CNPcomposites transmission electron microscopy(TEM) was used,while their mechanical behavior was investigated using the Vickers pyramid method for hardness measurements and a universal tensile testing machine for tensile tests.TEM results showed an array of dislocation lines decorated in the sintered pure nickel sample,whereas,for the Ni–Si CNPcomposites,the presence of nano-dispersed Si CNPand twinning crystals was observed.These homogeneously distributed Si CNPwere found located either within the matrix,between twins or on grain boundaries.For the Ni–Si CNPcomposites,coerced coarsening of the Si CNPassembly occurred with increasing Si CNPcontent.Furthermore,the grain sizes of the Ni–Si CNPcomposites were much finer than that of the unreinforced pure nickel,which was considered to be due to the composite ball milling process.In all cases,the Ni–Si CNPcomposites showed higher strengths and hardness values than the unreinforced pure nickel,likely due to a combination of dispersion strengthening(Orowan effects) and particle strengthening(Hall–Petch effects).For the Ni–Si CNPcomposites,the strength increased initially and then decreased as a function of Si CNPcontent,whereas their elongation percentages decreased linearly.Compared to all materials tested,the Ni–Si CNPcomposite containing 1.5% Si C was found more superior considering both their strength and plastic properties.     

Directional Growth of Tin Crystals Controlled by Combined Solute Concentration Gradient Field and Static Magnetic Field

A new method was introduced to achieve directional growth of Sn crystals. Microstructures in liquid(Pb)/liquid(Sn) diffusion couples were investigated under various static magnetic fields. Results show that the β-Sn crystals mainly reveal an irregular dendritic morphology without or with a relatively low static magnetic field(B0.3 T). When the magnetic field is increased to 0.5 T, the β-Sn dendrites close to the final stage of growth begin to show some directional character. With a further increase in the magnetic field to a higher level(0.8–5 T), the β-Sn dendrites have an enhanced directional growth character, but the dendrites show a certain deflection. As the magnetic field is increased to 12 T, the directional growth of the β-Sn dendrites in the center of the couple is severely destroyed. The mechanism of the directional growth of the β-Sn crystals and the deflection of the β-Sn crystals with the application of static magnetic field was tentatively discussed.     

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.