变压器硅钢片下料半自动线

在“工业学大庆”的群众运动中,我厂广大职工坚持学理论、抓路线,大搞技术革新和技术革命,自制了多刀滚剪机,与剪板机组合使用实现了变压器硅钢片开卷、切断、送料、滚剪、理料电控半自动流水线(见图1),解决了硅钢片卷料下料的问题。     

先进开卷落料线的工艺规划设计

开卷落料线是一种适用于汽车、钢板配送等行业高档外饰卷板的板材加工设备。本文通过对开卷落料线各模块功能分析,论述了开卷落料线建线中的开卷输送系统设计、主要加工设备选用、堆垛装置设计等。开卷落料线的工艺规划设计应该充分考虑铝合金板材的应用。分析结果表明,钢铝混合开卷落料线的工艺规划设计可以满足未来生产线的发展需要,同时可以大大降低企业设备投资及生产区域面积。     

MASTERDRIVE MC在开卷剪切生产线位置控制中的应用

本文介绍了开卷线伺服系统的特点及西门子MASTERDR IVE MC应用于开卷线控制时的要点。     

开卷线计算机监控系统软件设计

1　概述本监控系统是为某生产厂3Ｘ1600开卷-校平-剪切-堆垛生产线而设计的(简称开卷线-Ｄ单元),是车间ＦＭＳ生产线中央控制机(简称-Ｘ单元)不可分割的组成部分。完成开卷线的监控、数据管理及立体化仓库(简称-Ｃ单元)和中央机Ｘ的通讯功能。主要完成:(1)加工方式设置。可设置Ｄ、Ｄ+Ｘ、Ｄ+Ｃ+Ｘ三种加工方式。(2)开卷线数据库管理。完成系统的订货、登录及统计功能并对开卷线的进出货进行统一管理。(3)完成开卷线的监控及生产调度。监控开卷线的运行状态;编制开卷线的自动手动加工循环程序;将Ｘ指令实时下发给开卷线的ＰＬＣ控制器控制开…     

开卷线落料模结构设计

简述了开卷线的设备布置,详细介绍了开卷线落料模结构的设计方法及其注意事项,叙述了模具工作过程,可为类似制件的模具设计提供参考。     

视觉检测系统在开卷线中的运用

开卷校平剪切生产线市场需求大,客户通常购买开卷线自主开料,自由度高,能够满足自身钣金加工产线的多规格材料需求,有利于保障生产材料安全,降低生产成本,提高生产效率,是钣金加工行业的重要组成部分。将开卷线打造成原材料到成品的自动化生产线能够提高产品竞争力,提高产线价值,但是如何保证成品能够达到精度要求是一个无法回避的问题。本文介绍了视觉检测系统在提高开卷自动化产线成品精度中的运用。     

开卷矫平生产线中开卷机的电机功率计算

开卷机是板材数控开卷矫平线中的重要部件,其电机功率的选取至关重要。本文主要介绍了开卷机的电机功率计算方法及最终选型。     

开卷线中剪板机结构形式探讨

分析了开卷线对剪板机的使用要求。提出了适合开卷线中定尺剪切和切头剪切的机械剪板机和液压剪板机的结构形式,并进行了受力分析。     

开卷落料模设计

介绍了开卷落料模与开卷落料线压力机之间的关系,同时还详细介绍了开卷落料模上的主要装置,对每个装置进行详细地介绍与分析,以及在制造开卷落料模时需注意的事项。     

济南二机床集团自主品牌高档开卷落料线出口国际市场

近日，济南二机床集团公司为印度CAPARO公司提供的BL-3x1850高档开卷落料线在通过国内的验收后发往用户所在地。据悉，这是济南二机床公司拥有完全自主知识产权、自主研发制造、自营出口的首条高档开卷落料线，也是国产高档开卷落料线首次出口，标志着国产自动化板材加工设备已经得到国际市场认可，打破了国外企业在这一领域的垄断地位。     

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.     

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.     

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.     

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.