首页 > casting
全部论文
电力论文   |   建筑论文  |  机械论文  |  化工论文  |  石油论文  |  冶金论文  |  矿产论文  |  材料论文  |  电子论文  |  航空航天论文  |  通信论文  |  计算机论文  |  水利论文  |  地质论文  |  铁道论文  |  汽车论文  |  管理论文  |  农业论文  |  食品论文  |  医学论文  |  海洋论文  |  船舶论文
  • GB/T 23301-2009汽车车轮用铸造铝合金Casting aluminum alloy for automobile wheels

    本标准为首次制定。<br>本标准规定了汽车车轮用铸造铝合金的技术要求与检验规则。<br>本标准适用于车轮金属型铸造用铸造铝合金。摩托车车轮用的铸造铝合金也可参照本标准使用。...

    2022-06-09 10:22:08浏览:1 castingaluminum铝合金

    查看
  • GB/T 15117-1994铜合金压铸件Copper alloy die castings

    本标准规定了铜合金压铸件的技术要求、质量保证、试验方法和检验规则、交货条件等。本标准适用于铜合金压铸件。...

    2022-06-06 09:06:46浏览:1 合金castingcastings

    查看
  • GB/T 4678.15-2021压铸模 零件 第15部分:垫块Die casting dies. Components. Part 15: Spacer blocks

    GB/T 4678.15-2021压铸模 零件 第15部分:垫块Die casting dies. Components. Part 15: Spacer blocks...

    2022-03-22 15:21:36浏览:9 componentscomponentcasting

    查看
  • Virtual Mold Technique in Thermal Stress Analysis during Casting Process

    It is important to analyse the casting product and the mold at the same time considering thermal contraction of the casting and thermal expansion of the mold. The analysis considering contact of the casting and the mold induces the precise prediction of stress distribution and the defect such as hot tearing. But it is difficult to generate FEM mesh for the interface of the casting and the mold. Moreover the mesh for the mold domain spends lots of computational time and memory for the analysis due to a number of meshes. Consequently we proposed the virtual mold technique which only uses mesh of the casting part for thermal stress analysis in casting process. The spring bar element in virtual mold technique is used to consider the contact of the casting and the mold. In general, a volume of the mold is much bigger than that of casting part, so the proposed technique decreases the number of mesh and saves the computational memory and time greatly. In this study, the proposed technique was verified by the comparison with the traditional contact technique on a specimen. And the proposed technique gave satisfactory results....

    2020-11-22 17:58:37浏览:22 castingprocessthermalstressAnalysisvirtualmold

    查看
  • Lab experiments on the innovative rapid thick strip casting process

    Rapid thick strip casting (RTSC) by Anton Hulek,Inventmetall(R),is an innovative concept for the production of hot stops with a final as-cast thickness of about 25 mm before rolling.The innovation of the mechanism consists in a vertical mould performing a caterpillar motion.This moving mould has an unconventional parallelogram-shaped cross-section.The conventional rectangular shape is formed in the shaping machine,which is placed straight below the mould.Further elements of the technology are state-of-the-art.For the investigation of this new casting system theoretical calculations were complemented with practical experiments.The investigation focused mainly on two key aspects:the characteristics of the mould and the shaping process.For the practical analysis a static mould with three pairs of elements in laboratory scale was developed and commissioned by the Dept.of Ferrous Metallurgy @RWTH Aachen University.The shaping experiments were carried out in model scale with two different materials and in variable boundary conditions.The results of these experiments delivered important mechanical as well as thermal informations about the casting system....

    2020-11-22 17:58:37浏览:23 continuouscastingRapidSolidificationstripmetalmouldsnear-net-shape

    查看
  • Effect of vacuum on solidification process and microstructure of LFC magnesium alloy

    Lost foam casting (LFC) is regarded as a cost-effective, environment-friendly vital option to the conventional casting process for production of near-net shape castings with high quality. Effect of vacuum on the solidification process and microstructure of LFC magnesium alloy were explored. The results indicate that vacuum plays a very important role in the heat transfer during mould filling and solidification periods, it increases the cooling rate of the filling melt, but greatly decreases the cooling rate of the casting during solidification period, and the solidification time of the casting is greater than that without vacuum. The microstructure of LFC magnesium alloy is rather coarse. Compared with that without vacuum, the microstructure of the LFC magnesium alloy under vacuum is more refined and has less precipitated β-phase, which is formed at the grain boundry and around the Al-Mn compound particle....

    2020-11-22 17:58:37浏览:26 magnesiumalloyLostfoamcastingvacuumSolidificationprocessmicrostructure

    查看
  • Numerical simulation of mould filling process for pressure plate and valve handle in LFC

    In lost foam casting (LFC),the distribution of polymer beads during the bead filling process is not uniform,and the collision between polymer beads determines the distribution of two-phase flow of gas and solid.The interaction between the gas and solid phases reveals as coupling effect of the force that gas exerts on particles or vice versa,or that among particles.The gas-solid flow in filling process is nonlinearity,which makes the coupling effect an essential point to carry out a simulation properly.Therefore,information of each particle's motion is important for acquiring the law of filling process.In bead filling process,compressed air is pressed into mold cavity,and discharged from gas vent,creating a pressure difference between outer and inner space near the gas vent.This pressure difference directly changes the spatial distribution and motion trace of gas and solid phases.In this paper,Discrete Element Method (DEM) and Computational Fluid Dynamics (CFD) are employed to simulate the fluid dynamic character based on Newton's Third Law of Motion.The simulation results of some casting products such as pressure plate and valve handle are compared with the result obtained from practical experiment in order to test the feasibility of DEM.The comparison shows that this DEM method can be a very promising tool in the mould filling simulation of beads' movement....

    2020-11-11 22:33:38浏览:37 Lostfoamcastingbeadfillingprocesstwo-phaseflownumericalsimulation

    查看
  • Process Optimization for AZ91 Mg-alloy Low-pressure EPC Process

    The influence of a key process variable on the mold filling characteristics of AZ91 Mg-alloy was studied in the low pressure EPC process.The applied flow quantity of insert gas from 1 to 5 m3/h associated with the pressurizing rate in the low pressure EPC casting process was considered for rectangle and L-shape plate casting. The experimental results show that there is an optimal flow quantity of insert gas for good mold filling characteristics in AZ91 Mg-alloy low-pressure EPC process. The optimal flow quantity of insert gas for the specimens is 3 to 4 m3/h. Either less or higher than the optimal flow quantity of insert gas would lead to misrun defects or folds, blisters and porosity defects. The practice of hub casting confirmed that the low-pressure EPC process with an optimal processing variable exemplified as 4 m3/h gas flow quantity was capable of producing complicated magnesium castings without misrun defects....

    2020-11-11 22:33:38浏览:33 magnesiumalloylow-pressurecastingexpandablepatternprocess

    查看
  • Vacuum-sealed casting process under pressure

    A new casting method, the vacuum-sealed mold casting under pressure, has been developed, and thin wall iron castings with high precision and smooth surface have been produced successfully with this casting method. The experimental results show that the liquid iron has a very excellent filling ability because a high negative pressure is formed in the mold cavity during filling process. The vacuum-sealed mold under pressure has very high compressive strength greater than 650 kPa, which is 3-4 times as high as that of the molds produced by high-pressure molding process or vacuum-sealed molding process....

    2020-11-11 22:33:38浏览:19 castingprocessvacuum-sealedmoldpressure

    查看
  • Continuous squeeze casting process by mass production

    Squeeze casting has become the most competitive casting process in the automotive industry because of its many advantages over high pressure die casting (HPDC). Many squeeze casting R & D and small amount volume making have been implemented around the world, but the mass production control still exists problem. SPX Contech squeeze casting process P2000 successfully achieved the goal of mass production; it includes lower metal turbulence, less gas entrapment, minimum volumetric shrinkage, and thus less porosity. Like other casting processes, however, the quality of squeeze castings is still sensitive to process control and gate and runner design. Casting defects can form in both die-filling and metal solidification phases. The occurrence of casting defects is directly attributed to improper adjustment or lack of control of process parameters including metal filling velocity, temperature, dwell time, cooling pattern, casting design, and etc. This paper presents examples using P2000 techniques to improve part quality in the following areas: runner & gate design, casting & runner layout in the die, squeeze pin application, high thermal conductivityinserts, cooling/heating systems, spray & lubricant techniques,and part stress calculation from shrinkage or displacement prediction after stress relief....

    2020-11-10 09:33:08浏览:20 squeezecastingdieprocess

    查看
  • Application of the gel casting process in iron powder metallurgy

    The effects of various gel casting process parameters such as the dispersant and solid loading on the rheology of Fe slurries, molding, and sintering behaviors were studied. The relationship between solid loading and viscidity in the process of iron base powder metallurgy was researched to obtain better microstructure and properties. The results showed that the viscosity of Fe slurries is obviously reduced with the increase of the dispersant. The suitable parameters are as follows: the solid loading is 61% and sintering temperature is 1180℃. Iron parts with relatively high density and better properties were obtained by the gel casting process....

    2020-11-10 09:33:08浏览:20 gelcastingFepowdermetallurgyrheology

    查看
  • Design of process parameters for direct squeeze casting

    On the basis of the analysis of solidification interval and temperature distribution of components manufactured by the squeeze casting method, formulas for calculating the solidification interval and compaction pressure were deduced according to the principal request that the compaction pressure should be equal to or greater than the plastic deformation resistance of the forming component when solidification ended. The solidification interval was proven to be associated with many factors, such as weight of the component, specific heat of the alloy, latent heat, pouring temperature, component temperature at the end of solidification and heat-transfer coefficients. The compaction pressure was related to the strain rate, deformation temperature, and dimension of the de-forming component. The solidification interval and compaction pressure calculated by the formulas deduced in this article were adopted in the production of 45 steel bidirectional chapiter valves, and components with excellent performance were manufactured....

    2020-11-10 09:33:08浏览:25 squeezecastingSolidificationtimetemperaturedistributioncompactionpressure

    查看
  • Calculation of Solidification Process of Continuous Cast Bar

    In this paper, it presents the results of calculation of solidification process of copper continuous cast bar by cross section size 120 mm×70 mm with application of ProCast 2010 software. The estimation of mould design effect on solidification process of continuos copper cast bar is completed at various speeds of casting. Profiles of liquid metal cavities and temperature allocations in the cast bar at various casting speeds are defined. The analysis of received liquid metal cavity profiles shows that a new mold construction allows significantly decrease of the length of the liquid metal cavity during continuous copper casting at HAZELETT? casting machine and the increase of maximum casting speed from 10 to 11 m/min. Adequacy of the results of copper continuous cast bar solidification process calculation is confirmed by the experimental data....

    2020-11-10 09:33:08浏览:39 continuouscastingcopperCASTbarwatercoolingmoldliquidmetalcavityheat

    查看
  • Improvement in mechanical properties of hypereutectic Al-Si-Cu alloys through sono-solidiifed slurry

    For the wider applications, it is necessary to improve the ductility as wel as the strength and wear-resistance of hypereutectic Al-Si-Cu aloys, which are typical light-weight wear-resistant materials. An increase in the amounts of primary silicon particles causes the modiifed wear-resistance of hypereutectic Al-Si-Cu aloys, but leads to the poor strength and ductility. It is known that dual phase steels composed of hetero-structure have succeeded in bringing contradictory mechanical properties of high strength and ductility concurrently. In order to apply the idea of hetero-structure to hypereutectic Al-Si-Cu alloys for the achievement of high strength and ductility along with wear resistance, ultrasonic irradiation of the molten metal during the solidiifcation, which is caled sono-solidiifcation, was carried out from its molten state to just above the eutectic temperature. The sono-solidiifed Al-17Si-4Cu aloy is composed of hetero-structure, which are, hard primary silicon particles, soft non-equilibriuma-Al phase and the eutectic region. Rheo-casting was performed at just above the eutectic temperature with sono-solidiifed slurry to shape a disk specimen. After the rheo-casting with modiifed sono-solidiifed slurry held for 45 s at 570 oC, the quantitative optical microscope observation exhibits that the microstructure is composed of 18area% of hard primary silicon particles and 57area% of softa-Al phase. In contrast, there exist only 5 area% of primary silicon particles and noa-Al phase in rheo-cast specimen with normaly solidiifed slurry. Hence the tensile tests of T6 treated rheo-cast specimens with modified sono-solidified slurry exhibit improved strength and 5% of elongation, regardless of having more than 3 times higher amounts of primary silicon particles compared to that of rheo-cast specimen with normaly solidiifed slurry....

    2020-11-03 10:30:25浏览:31 semisolidcastingslurryultrasonicvibrationsono-solidiifcation

    查看
  • Progress in the application of cold gas dynamic spraying to repairing continuous casting molds

    A new continuous casting mold repairing method-cold gas dynamic spraying(CGDS)is introduced.The study investigates the advantages of the CGDS process regarding repairing operation,such as convenient,in-situ repairation,little heat delivery,microstructural and dimensional stability and other special applications.Microstructure and mechanical properties of the copper alloy coating,nickel coating,ceramic composite coating,and their interface to the substrates,which are usually used in repairing operation have been researched by means of optical microscopy(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and micro-hardness tests.Experimental results have demonstrated the relative density of the copper alloy coating is as high as 98.7%,and that no obvious diflference Can be observed between the CrZrCu substrate and the Cu alloy coating in terms of microstmctures;thus the interface is quite difficult to be identified.The bonding strength and micro-hardness of the Cu alloy coating reach up to 37 MPa and 310 HV0. 2,respectively.The interface between the copper alloy coating and the nickel coating is either zigzag or wave shaped,and the cohesion is relatively good.As-sprayed nickel coating is dominated by severely deformed particles,and the relative density is up to 98.5%.Complete recrystallization occurred after annealing at 900℃ for one hour,while its micro-hardness remains as high as 124.1HV0.2. All these results have indicated that CGDS is a promising technology for repairing the continuous casting mold and that its future development is prosperous as well....

    2020-09-15 12:28:59浏览:34 coldgasdynamicspraying(CGDS)continuouscastingmoldrepairingcoating

    查看
  • Water Modeling of Twin-Roll Strip Casting

    Twin-roll strip casting is regarded as a prospective technology of near net shape continuous casting. The fluid flow field and level fluctuation in the pool have a strong influence not only on composition and temperature homogeneity of pool, but also on the strip quality. A 1∶1 water model of a twin-roll strip caster was set up based on the criteria of Froude number and Reynold number similarity. The level fluctuation was measured. The influence of pool depth, casting speed and feeding system configuration on level fluctuation in the pool was studied. The experimental results provided a basis for the optimization of feeding system and process parameters....

    2020-07-08 08:49:41浏览:24 twin-rollstripcastinglevelfluctuationwatermodeling

    查看
  • Dynamic Water Modeling and Application of Billet Continuous Casting

    The continuous casting process is used for solidifying molten steel into semi-finished steel. The technology of secondary cooling is extremely important for output of the casting machine and billet quality. A dynamic water model was introduced, including solidification model in the secondary cooling, feedforward control strategy based on continuous temperature measurement in tundish, and feedback control strategy based on surface temperature measurement. The mathematical model of solidification process was developed according to the principle of solidification, and the solidification model was validated by measuring billet shell thickness through shooting nail and sulfur print. Primary water distribution was calculated by the solidification model according to procedure parameters, and it was adjusted by the other two control strategies online. The model was applied on some caster and billet quality was obviously improved, indicating that the dynamic water model is better than conventional ones....

    2020-07-08 08:49:41浏览:17 billetcontinuouscastingsecondarycoolingwatermodelquality

    查看

能化大数据平台 ©2010-2022 All Rights Reserved.  
沪ICP备14007155号-3 网站地图 化工热词旧版本
关于我们| 会员说明| 广告合作| 联系我们| 免责声明| 投稿须知|

能源化工大数据平台-煤化工网二维码
在线客服
服务邮箱

服务邮箱

cnmhg168@163.com

微信咨询
微信
返回顶部
X我的网站名称

截屏,微信识别二维码

微信号:anquanhun

(点击微信号复制,添加好友)

  打开微信

微信号已复制,请打开微信添加咨询详情!
[!--page.stats--]