汽车防撞杆焊接工作站研制

主要介绍了汽车防撞杆焊接工作站的组成部分和焊接原理,实现了防撞杆焊接过程的定位精准、焊接质量的改善和生产效率的提升,极大地满足了客户需求。     

侧面碰撞车门防撞杆的失效与焊缝布置优化

介绍车型侧面碰撞试验,并对试验过程中防撞杆开裂的问题开展系列检测与分析,如外观观察、金相组织分析、断口分析以及三点弯曲试验等,最终查明零件失效的根本原因并提出整改方案。结果表明:防撞杆材料为高强度焊管,经过淬火+低温回火后材料组织敏感性较高;防撞杆在与支架进行二氧化碳保护焊接过程中受到焊接热的影响,进而导致焊管局部材料组织发生转变、力学性能遭到弱化,侧面碰撞时从薄弱区发生开裂。通过改变防撞杆与支架的焊缝布置方式,由周向焊接更改为纵向焊接,来减轻焊接热的影响,后续零件已经顺利通过碰撞试验。     

一体压铸工艺为机床产业带来新机遇

正一体化压铸是对传统汽车制造工艺(冲压+焊接)的颠覆,其在成本、效率、加工质量等方面拥有巨大优势,未来在新能源汽车领域有望快速渗透。一体化压铸成型后,需要配套相应机床进行压铸件的毛刺与毛边等的切削,若考虑该工艺用于整车加工,根据测算,中国年产800万辆新能源汽车对应机床(以龙门为主)总需求在440亿元左右,年均为88亿元。预计从2022年开始,随着其他新能源汽车厂商逐步跟进推动一体压铸工艺,相关机床需求将迎来爆发。     

汽车减振器储油缸三枪同步焊接机床设计

汽车后减振器贮油缸总成有三条焊缝,针对这种特殊结构,研制了三枪同步焊接机床。该机床采用PLC控制,三台焊机同时工作,不同焊接时段采用不同的焊接规范,且缸底焊接时焊枪自动变位,实现了三条焊缝的同时自动焊接,保证了焊缝质量,提高了生产效益。     

钢圈环缝双枪自动焊接机床的设计

GQH-S型钢圈环缝双枪自动焊接机床是河南机电高等专科学校根据汽车钢圈焊接的要求自行研制的环缝自动焊接设备,主要用于型钢钢圈的内、外环缝焊接。采用可编程逻辑控制器(PLC)作为系统的中心逻辑控制单元,采用触摸屏作为人机对话窗口。专用机床工作时,双枪同时施焊,焊缝质量良好,效率大幅提高。     

汽车传动轴专用焊接设备的研制

为解决汽车传动轴制造过程中的焊接质量和焊接效率问题,开发了基于PLC控制的汽车传动轴专用焊接设备.结合该设备技术要求、主要参数、工作原理和汽车传动轴焊接工艺要求,给出了其控制系统的硬件设计、软件设计流程和PLC梯形图程序.该汽车传动轴专用焊接设备能够通过控制系统对焊接过程进行实时控制,保证焊接后传动轴达到预定的质量要求...     

大型复杂构件数控焊接机床的设计与分析

针对大型复杂构件焊接及其加工技术要求,介绍了一款双摆轴五轴联动数控焊接机床的设计与分析,包括机床总体设计,各进给轴设计以及机床结构有限元分析,为大行程空间复杂构件数控焊接机床研制提供了可靠的技术支持.     

基于TRIO和PLC双控制器的船舶焊接机器人运动控制系统设计

针对现阶段船舶制造业焊接工艺的自动化加工水平普遍不高、人工焊接成本较高、效率低下、质量参差不齐的现状,设计出一种基于嵌入式运动控制器TRIO和PLC的龙门架式八轴焊接机器人运动控制系统。通过控制器TRIO驱动机器人八轴联动,实现了大尺寸大曲率船体板材的自动化焊接,PLC保证了系统运行的正确逻辑、各种电气信号的控制和采集。两个控制器之间通过RS232自由口协议实现稳定双向串行通信。试验证明,该焊接运动控制系统大大提高了焊接效率和质量,降低了工人劳动强度,有较强的应用和推广价值。     

基于伺服电机的焊机进给系统

电阻单面凸焊作为一种重要的焊接工艺方法,已广泛应用于航空、航天、汽车制造、电子技术等工业领域。为了实现对电阻单面凸焊进给系统的精确控制,提高电阻单面凸焊的生产效率、减轻工人的劳动强度及确保工人的生命安全,以STM32系列单片机为控制器,将伺服电机用于焊接机床的进给系统,合理的设计系统的软件和硬件,以期方便而又稳定地控制机床进给,实现焊接机床的自动化。介绍了该控制系统的总体方案、系统硬件构成和软件总体框图。     

微型汽车传动轴轴管叉双头相位摩擦焊机的研制

研究设计了一种用于微型汽车传动轴轴管叉焊接的双头相位摩擦焊机。该焊机可一次装夹同时完成轴管叉焊接总成的2道焊缝,实现了轴管叉焊接总成的装配焊接,在保证轴管叉精度和质量的前提下,大大提高了生产效率,降低了生产成本。并且比现有的焊接工艺节约能源,清洁环境,绿色环保。     

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.     

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.     

The Mirror with Patterns of Auspicious Animals and Grapes——Exquisite cast mirror and the technology of surface tin-enrichment by rubbing-in and infiltration of tin-rich powder

<正>Bronze mirrors were used by the Chinese people before the introduction of the glass mirror.Only after it was replaced by the glass mirror did the bronze mirror gradually retreat from people's lives.Different styles of bronze mirrors were made in different historical periods,particularly in the Warring States Period,the Han and Tang Dynasties,which were the three peaks of the development of bronze mirror arts in ancient China.The casting techniques were exquisite.The surface of the bronze mirror was smooth and bright enough to reflect one's image,and there were scarcely any casting defects on the mirror surface.On the back of the bronze mirror,there were rich depictions of Arts and Humanities,and the ornamentations were also     

The 9th China International Diecasting Congress & Exhibition

The 9th China International Diecasting Congress ＆ Exhibition was held on July 22-24, 2014 at Shanghai New International Expc Centre. This exhibition was the most successful over the years, with over 6890 visitors and 155 exhibitors, and the exhibition area increased by 30% from 9,500 square meters in 2012 to 12340 square meters. Die casting enterprises from a total of 24 countries and regions, including China mainland, Chinese Taiwan and Hong Kong, South Korea, Japan, Germany, India, Thailand, Malaysia, the United States, Russia, Australia, Iran, Ukraine, Brazil, Colombia, Singapore, Austria, Canada, Croatia, France, Turkey, United Kingdom, Vietnam, attended the congress and exhibition.     

Introduction of the Fluid Control Engineering Institute of Kunming University of Science and Technology

正The Fluid Control Engineering Institute of Kunming University of Science and Technology was set up in 1996.The researches of institute concentrate on electro-hydraulic(pneumatic)servo/proportional control and hydromechatronics.The Institute is committed to research and development of electro-hydraulic control of high-end technical equipment in ferrous metallurgy refining produc-     

RARE METALS Volume Contents

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Antimony Induced Crystallization of Amorphous Silicon

Antimony induced crystallization of PVD (physics vapor deposition) amorphous silicon can be observed on sapphire substrates. Very large crystalline regions up to several tens of micrometers can be formed. The Si diffraction patterns of the area of crystallization can be observed with TEM (transmission electron microscopy). Only a few and much smaller crystals of the order of 1μm were formed when the antimony layer was deposited by MBE (molecular beam epitaxy) compared with a layer formed by thermal evaporation. The use of high vacuum is essential in order to observe any Sb induced crystallization at all. In addition it is necessary to take measures to limit the evaporation of the antimony.     

A CUMULATIVE FATIGUE DAMAGE RULE UNDER THE ALTERNATIVE OF CORROSION OR CYCLIC LOADING

Fatigue damage increases with the applied loading cycles in a cumulative manner and the material deteriorates with the corrosion time. A cumulative fatigue damage rule under the alternative of corrosion or cyclic loading was proposed. The specimens of aluminum alloy LY12-CZ soaked in corrosive liquid for different times were tested under the constant amplitude cyclic loading to obtain S-N curves. The test was carried out to verify the proposed cumulative fatigue damage rule under the different combinations among corrosion time, loading level, and the cycle numbers. It was shown that the predicted residual fatigue lives showed a good agreement with the experimental results and the proposed rule was simple and can be easily adopted.