瓦形磁体自动湿压模

<正> 瓦形磁体自动湿压摸是1985年我厂从国外引进先进永磁铁氧体生产成型设备PHI—100型自动压机的配套模具。该模具用于压制高性能瓦形磁体(见图1所示),一模多件,生产效率高,自动化程度高。模具采用腔式自动注料结构,浮动压制成型技术,结     

永磁铁氧体流道板式自动注料模具设计

针对现有永磁铁氧体料腔式自动注料模具存在的问题，设计了永磁铁氧体流道板式自动注料模具，并通过模腔进料口平衡值计算解决了1模多腔模具不同型腔成型零件毛坯的重量一致性问题。     

平板硫化机上使用的注胶式压模

<正> 当前橡胶的成型已经从压制转向注射成型。注射成型的优点是制件质量好。但暂不具备注射机注压的工艺条件下,运用柱塞式注射机的注压原理,利用现有的平板硫化机,用注胶式压模代替填胶式压模,可显著提高橡胶制品的内在质量,大大简化复杂的装料(胶)工艺程序,提高生产率。     

热固性塑料温流道注压成型工艺

热固性塑料温流道注压成型工艺是在70年代中期由欧、美、日等国首先开发和运用的一种热固性塑料成型工艺，汇集了注射成型工艺的高生产率、压制成型工艺的高质量和温流道注射成型工艺节料节电的优点，同时又将上述三种成型工艺原先的短处相互抵消了。它降低了对注塑机压力以及模具材质方面的要求，并且减少了热固性塑料制品加工投资，宜于大面积推广。     

树脂磨具的松散性成型料研究

普通树脂磨具多以酚醛树脂粉为结合剂、酚醛树脂液为润湿剂,成型料容易发粘。结块、松散性很差,尤其在炎热、多雨的夏季,往往难于刮料。近几年,在引进的全自动压机上,加料和刮料都是机械化自动操作,对树脂磨具成型料的松散性比人工操作提出了更高的要求,为此,我们用国产原料对树脂松散料进行了初步的探索。1导致树脂成型料不松散的原因和解决的途径1．1导致原因我们认为导致成型料不松散、容易结块的主要原因是酚醛树脂液中含有游离酚（其含量为20％左右）,游离酚能溶解一部分酚醛树脂粉,致使粘附在磨粒表面的干树脂粉发粘。此外…     

精铸模料的膏状压注和固态压注 --国外精铸技术进展述评(2)

由于模料液态压注存在体收缩率较大和制模周期长的缺点,自20世纪90年代以来,液态压注有"回归"到膏状压注的趋势.对于大型压蜡机,实现膏状压注的关键是设计制造性能稳定的膏状蜡制备和供给系统.固态压注技术近年已取得突破性进展,优点是模料体收缩率很小,蜡模无缩陷,压型设计、制造简化.     

基于FANUC机器人的鼓式刹车片成型生产线的设计与实现

主要介绍一种基于FANUC机器人的鼓式刹车片成型生产线的设计方案和实现过程。在现有成型工艺和设备的基础上,研究自动化实现方案。采用3台六轴机器人配合相应桁架、运动平台、运料小车及自动收料机,以实现胚料压制、胚料取出、坯料运送、吹屑清洁、喷脱模剂、冷坯放置、成品取出、自动收料等动作,从而实现整个成型生产的自动化。     

断路器转轴压注模设计

介绍了断路器转轴的结构特点和成型工艺难点,完成了压注模成型结构设计;分析了模具加料系统、模具隔热结构设计、模内切浇口结构设计、模具成型零件设计等。结果表明,保证了塑件的内在及外观质量,提高了模具压注效率和模具使用寿命,节约了能源。     

熔模铸造液态压注模料初探

近来国外在熔模铸造中越来越多地采用了液态模料。早在1969年苏联《》便曾载文指出,如用糊状压注模料时,蜡模表面光洁度最高可达6,铸件为5。如用液态压注模料,蜡模光洁度可达9以上,铸件可达7以上。 一、液态压注模料的成分、显微组织和性能 对模料显微组织的研究表明:研制液态压注模料的基本指导思想应是,以某种非晶质组元为溶剂,于熔融状态溶入一种或数种晶质组元,形成均质熔体。当冷却时,因溶解度降低,晶质组元析出,模料也随之凝固。所得模料的显微组织为非晶相的基体中     

制模工艺参数及计算机控制--国外精铸技术进展述评(3)

介绍国外先进的压蜡机对模料温度、压型温度、注蜡压力以及模料流速等工艺参数的控制技术.为准确控制模料温度应将温度传感器直接插入模料中;而控制压型型腔温度的最好办法是将压型与压板隔开,将热电偶安放在压型靠近型腔表面的位置.注蜡压力和模料流速应单独独立控制,而充型压力和压实压力也须分别加以控制.介绍了模料压注过程的计算机程序控制和计算机实时控制技术.     

漏斗式自动送料弯曲模设计

介绍了在通用冲床上使用的漏斗式自动送料弯曲模的结构形式、工作过程和设计要点。该模具采用漏斗式半自动送料装置,用于弯制各种V形、U形和弓形工件,适合大批量生产。     

双孔洞排布位置对C轴压缩镁单晶的影响研究

为探究双孔洞位置排布对于镁及镁合金塑性变形的影响,应用分子动力学方法模拟在300k下含不同排布位置的双孔洞镁单晶c轴压缩模型,结合三种模型的应力-应变曲线、势能曲线、径向分布函数和位错密度曲线,分析不同排布位置双孔洞镁单晶的压缩力学性能和结构演化过程。结果表明：双孔洞镁单晶在与加载方向平行时可承受的压应力峰值和势能峰值以及对应的应变程度最大;与加载方向垂直时次之,当与加载方向呈45°排布时最小,且与c轴呈90°排布的双孔洞镁单晶模型孔洞闭合速率最快。     

降低熟料溶出过程中碳碱浓度的方法

介绍了一种实现熟料低Na2Oc溶出的方法,通过在熟料溶出过程中添加一种化学添加剂,来抑制熟料溶出二次反应,改善赤泥沉降性能和压缩性能,提高氧化铝溶出率,从而减少粗液中的SiO2浓度,减轻了脱硅工序的负担,避免了碳碱在烧结法湿法系统的循环。     

Inner-product of strain rate vector through direction cosine in coordinates for disk forging

1Introduction Since friction over the surface of disk forging lowers the velocity at the surface,causing the center y=0to move faster with a resultant bulge as shown in Fig.1(a).Therefore,this velocity gradient from the surface to the interior brings abou…     

Performance characteristics of EZhou bentonite of Hubei province and its modification

Both the chemical compositions and performance characteristics of the bentonite raw ores in Ezhou area of Hubei province and Honghuoshan area of Liaoning province were compared and analyzed. The properties of these two kinds of bentonites were tested before and after Na+- and Li+-modification. The results show that the Ezhou bentonite ore possesses higher montmorillonite content than the Honghuoshan bentonite ore, but the Ezhou Na-bentonite has weaker castability (e.g. Wet compression strength and hot wet tensile strength) than the Honghuoshan Na-bentonite, while the performance of Ezhou Li-bentonite, such as colloid index, swelling value, swelling volume and mould coating performance, is equivalent to that of the Honghuoshan Na-bentonite.     

合金游动芯头模具型腔的设计

通过对TPA压机压制行程的分析,研究了游动芯头模具型腔成型区设计的特点,进行了主要参数的设计计算。     

Deformation behavior of an ordered B2 phase in Ti–25Al–25Zr alloy

The mechanical behavior of the B2 phase in alloy Ti–25Al–25Zr has been studied under compression. True stress–strain curve exhibits similar behavior to those of typical B2 intermetallics such as NiAl and FeAl. The alloy exhibits highest yield strength in comparison to those reported in other titanium based B2 alloys with around 2% plastic strain. The microstructural characterization of specimen after compression reveals that the B2 phase transforms to an orthorhombic martensitic phase during compression.     

Microstructure and thermal stability of sintered pure tungsten processed by multiple direction compression

Multiple direction compression (MDC) was conducted on sintered pure tungsten (99.9%, mass fraction) with different reductions at 1423 K. The microstructure, microhardness and thermal stability of the MDC-processed samples were studied by X-ray diffraction (XRD), electron backscattered diffraction (EBSD) and differential scanning calorimetry (DSC) compared with those of the initial sintered tungsten. The results show that the dislocation density increases significantly with the reduction of MDC, ranging from 3.08×10¹⁴ m^–2 for the initial sintered tungsten to 8.08×10¹⁴ m^–2 for the tungsten after MDC with the reduction of 50%. The average grain size decreases from 83.8 to 14.7 μm and the microhardness value increases from HV_0.2 417 to HV_0.2 521. The recrystallization temperature for the tungsten samples processed by MDC is approximately constant at around 1600 K. The MDC of sintered tungsten results in a decrease of grain size concurrent with an increase of uniformly distributed nucleation sites, which leads to the improvement of the thermal stability.     

Fine and Ultrafine Particle Characterization and Modeling in High-Speed Milling of 6061-T6 Aluminum Alloy

In this study, an experimental investigation was carried out on fine and ultrafine metallic dust emission during high-speed milling of 6061-T6 aluminum alloy in wet and dry conditions. Measurements of dust emission were conducted using a scanning mobility particle sizer spectrometer and an aerodynamic particle sizer spectrometer. These instruments were used to characterize particles in the micrometer and the nanometer size ranges. It was confirmed that the machining process produces nanoparticles as small as 10 nm and that the characteristics of the generated nanoparticles are not significantly influenced by the cutting conditions. The cutting forces and chip compression ratio were measured to validate the proposed dust generation model based on an energy approach. Good agreement was observed between the model and the experimental measurements for the investigated conditions. It was demonstrated that the majority of generated dust is caused by deformations in the primary shear zone. In addition, the percentage of generated dust is significantly influenced by deformation conditions in the chip formation zone. It was found that high cutting speeds could reduce the percentage of the generated particles during the milling process.