The technology and application of water-guided laser processing are reviewed in detail in this paper.Firstly,the characteristics of water-guided laser are introduced,and the formation mechanism of water-beam fiber is analyzed.According to the different processing methods,different application fields such as punching,cutting and grooving are introduced.Finally,in view of the shortcomings of the existing technology,its development trend is forecasted.
In this paper,Dynaform finite element simulation and forming experiment are used to study the expansion performance of AZ31 magnesium alloy thin-walled tube under constant temperature condition of hot oil,and a suitable technology for hot oil expansion of magnesium alloy thin-walled tube is explored.The results show that under the condition of pipe thickness of 2 mm and pushing head force of 4 kN,the forming temperature of 200℃can obtain the formed parts with small fracture tendency,good forming state and diameter of 29.1 mm.The simulation results are in good agreement with the experimental results.
The combination of high-pressure CO2 and cutting can significantly improve the processing performance of difficult-to-machine materials,which is a new green processing technology,and its process equipment needs to be developed urgently.Based on the TRIZ theory,material-filed analysis,conflict theory,cutting,effect and other tools,combined with resource analysis,small man method and goldfish method,from the perspective of high pressure CO2 cooling lubrication process development and device design,the formation of high pressure classification utilization,self-cooling buffer tank process and device,internal cooling tool,cutting force regulation and other solutions.Overall,it improves cooling and lubrication efficiency and reduces energy consumption and costs.After comprehensive evaluation to form a solution,integration and formation of a number of patents.The research has certain reference significance for the development and implementation of CO2 cooling processing technology,as well as the innovative design and optimization of mechanical devices.
In order to study the effects of different annealing regimes on the mechanical properties and microstructure of 5754 alloy,optical microscopy,transmission electron microscopy(TEM)and tensile test are used to analyze the alloy in detail.The results show that the annealing temperature affects the mechanical properties of 5754 aluminum alloy.When the annealing temperature increases from 270℃to 300℃,the microstructure of 5754 aluminum alloy cold-rolled sheet changes from fibrous to equiaemic.5754 aluminum alloy cold-rolled sheet bending angle increases with the increase of annealing temperature.
Taking a nonferrous metal processing plant as an example,this paper analyzes the properties of different underlying surfaces of industrial plants,and adopts a variety of low impact development facilities(LID)to compile a sponge city special planning and design that conforms to the actual conditions of industrial plants.This can not only meet the requirements of industrial production and use,but also realize the cross-peak discharge of rainwater,reduce the drainage pressure of the rainwater pipe network,and rationallly use rainwater resources to save water for industrial enterprises,which has a reference significance for the special planning and design of sponge cities in similar industrial plants.
In this paper,the mechanism of intergranular corrosion of 5xxx aluminum alloy and its influencing factors are briefly described.The research progress of intergranular corrosion of 5xxx aluminum alloy is introduced from the aspects of alloy composition,β-phase precipitation conditions(such as stabilization treatment,sensitization treatment,cold deformation,etc.),which provides a theoretical basis for improving and improving the resistance to intergranular corrosion of 5xxx aluminum alloy.
In this paper,the differences between continuous casting and rolling and continuous casting and direct rolling production processes are compared.The results show that the continuous casting and rolling production process has the characteristics of high alloying temperature,excessive high pass,tight production rhythm and difficult melt purification.The flux in aluminum alloy additive can be divided into exothermic flux and non-exothermic flux.Continuous casting and rolling is more suitable for using non-exothermic flux to ensure the quality of melt,and continuous casting and rolling is more suitable for using exothermic flux to ensure the full yield.
In this paper,the as-cast aluminum ingot is cryogenic treated at-196℃.The microstructure and properties of aluminum ingot before and after cryogenic place are analyzed by metallographic microscope,microhardness tester and eddy current conductance meter,and the appropriate cryogenic process parameters are obtained.The results show that cryogenic treatment can refine the grain and improve the density,microhardness and conductivity of aluminum ingot.The best cryogenic process of the material is cryogenic time 24h,single cryogenic,or cryogenic time 2h,3times cryogenic.Under the optimal process,the grain size is reduced by 35.3%and 44.1%respectively.Under the optimal cryogenic time,the density,microhardness and electrical conductivity of the material are increased by 10.3%,49.1%and 8.9%respectively.Under the optimal cryogenic frequency,the above parameters are increased by 10.4%,36.9%and 8.3%,respectively.Short-time multiple cryogenic treatment process can be used to cryogenic treatment of materials.
In this paper,the various problems of aluminum alloy composition transfer in the process of flat ingot production are studied,and the best transfer process is found by studying the transfer sequence of aluminum alloy of 1xxx,3xxx,5xxx and 8xxx series,furnace washing dilution,on-line box composition transition,special alloy casting transfer casting process,etc.
In this paper,a resign and casting process is developed according to the structural characteristics of magnesium alloy automobile bracket,and the casting is successfully produced through experiments,and the design method of resign sand casting process for magnesium alloy parts is mastered.
In this paper,a set of prediction method of tensile bending springback of 2024 alloy extruded profile is established by combining numerical simulation and experiment.By drawing the trajectory of the stretch bending machine in the movement process,the displacement curve of the stretch bending chuck is set up with the point coordinates,and the finite element model of the stretch bending process is established.By comparing the numerical simulation results with the actual test values,it is found that the numerical simulation error value is about 6%,which verifies the reliability of this method.The numerical simulation can predict the stretching-bending rebound of 2024 alloy profiles,which can greatly reduce the actual production test and save a lot of manpower and material resources.At the same time,the numerical simulation results also show the change of the overall stress distribution of 2024 alloy profiles during the tensile bending process.The observation shows that the stress distribution of the profile is uniform only in the pre stretching stage during the whole process of tensile bending;In the coating stage and even the supplementary drawing stage,the stress distribution of the profile is also different due to different shape variables,but in the whole coating process,the maximum stress always appears at the position where the profile is tangent to the die.After unloading,residual stress still exists in the profiles.
In this paper,the influence of water quenching and cold deformation on the evolution of residual stress of a large flange forging of 7050 aluminum alloy for aviation was studied by using finite element method.The results show that the water entry mode will significantly change the temperature gradient distribution of the edge forging and affect the residual stress during heat treatment.The non-uniformity of temperature distribution and residual stress of heat treatment can be reduced to the greatest extent by using the way of the top of the bar entering water first.The residual stress of heat treatment can be effectively reduced by cold deformation of the quenched aluminum alloy edge forging,and the tensile compression composite deformation with constant velocity loading of the forging using T7454 process has the best effect on residual deformation.The research will provide guidance for heat treatment process optimization and dimensional stability improvement of large aluminum alloy aviation forgings.
This paper introduces the problems in the use and maintenance of the old server in the control system of aluminum strip mill and the hyperfusion technology,and finally uses the hyperfusion virtualization fault-tolerant technology to transform and replace it,and obtains a good use effect,which can provide reference for the solution of such problems in the same industry.
Aiming at the problem of abnormal damage signals in the twin-crystal probe ultrasonic detection of zirconium alloy profile fins without defects detected by X-ray and with qualified physical and chemical properties,this paper compares the twin-crystal probe ultrasonic detection method with the water immersion focusing probe ultrasonic detection method,and compares the tissue in different states with the ultrasonic detection results.A nondestructive testing method for determining the qualify of zirconium alloy profile fins is proposed.
This paper mainly introduces the role and advantages of fluorine-free nickel-free medium temperature sealing agent in the anodic oxidation process of aluminum alloy as a sealing agent for aluminum oxide film.In the production of industrial profiles,the suitable sealing conditions of fluorine-free nickel-free medium temperature sealing agent are verified and discussed by the detection methods of phosphorus chromic acid leaching and sodium molybdate phosphate corrosion loss.
文章简要阐述了Al-Mg-Si铝合金锻造制品裂纹缺陷产生的原因,分别从宏观形貌、微观组织和微区表面成分进行检测分析.结果发现,裂纹主要是由以Al为主的氧化皮和非金属夹杂造成的,夹杂的存在割裂了基体连续性.产生原因可能是非金属夹杂物或氧化皮在铝合金铸造过程中混入,夹杂物和含Si相在随后的加工变形过程中破碎,导致在基体内产生裂纹缺陷.
文章定义了UBC料的含义,介绍了UBC料回收的现状及意义,并根据UBC料的特点,提出了其保级再生的目标;通过分析UBC料的预处理、脱漆、配料和熔炼铸造这几个关键工艺,指出了其保级再生的关键控制点.
文章就铜线材拉丝液起泡沫的原因、危害和解决方案进行了分析,对拉丝液的使用和维护做了阐述;指出企业应加大对拉丝液的监控力度,以保证拉制铜线材的质量和拉丝生产设备的健康运行.
文章分析了冷轧C19400 铜合金板带残余应力与材料内部微观组织之间的关系,通过SEM、EDS、EBSD、XRD等实验方法研究了基体及析出相的组织结构.结果表明,冷轧C19400 铜合金板带中Fe(C)及 Fe(C、P)固溶体析出相与基体结合力较大,随着C、P元素含量的增高,析出相与基体结合力减弱,极易从基体中脱落,使内部孔隙率增加,板带内部残余应力增加.通过控制C、P、Fe元素的含量,改善材料微观组织,可以降低板带内部残余应力,提高产品性能.
