透明制品注射模的研究与应用

以冰箱透明抽屉为例,介绍了透明抽屉注射模的典型成型机构以及冷却系统、浇注系统设计的关键点。结合此类制品在生产中出现的问题,对塑件做了有效的设计改良方案,分析了典型的成型机构,阐明了各机构的结构特点及应用条件。通过优化透明制品注射模的冷却系统及浇注系统,可有效保证制品质量、提高生产效率,降低模具费用。     

应用Taguchi实验设计法最小化ABS注塑制品翘曲变形量

运用Taguchi DOE技术研究了工艺参数对丙烯腈-丁二烯-苯乙烯共聚物(ABS)注塑制品翘曲变形的影响,并获得优化的工艺参数以使制品的翘曲变形量最小。文中以碱性蓄电池盖为例,利用L9(34)正交矩阵进行实验,并采用标准变量分析法(ANOVA)对熔体温度、注射时间、冷却时间、保压压力等工艺参数对制品翘曲变形的影响程度进行了研究,结果表明,在所选工艺参数中,保压压力和熔体温度对翘曲变形的影响程度最大。     

热流道注射有机玻璃盖

<正> 录音机磁带盒盖,一般是由ABS盖和有机玻璃观察片组成.需用两套塑压模,经两次注射,一次组装。而整体的有机玻璃磁带盒盖(图1)中间观察窗同样是透明的,只用一套塑压模一次注塑成形。我们试验了热     

大型收录机中框塑料模的设计与制造

<正> 一、中框塑件的特征分析与 技术要求 中框塑件是SL-302型收录机中最大的一个零件。其外形尺寸长×宽×高为529×285×85,四周壁厚为4 mm,材料为ABS工程塑料。制品重达825克。该制品为框架式,中间由若干条“T”型筋联接。在筋上及内侧壁上分布着30个高低不同的锥形凸     

ABS液压系统抗冲击性能研究与仿真分析

传统ABS液压系统工作时存在明显的振动与噪声,研究分析了ABS液压系统振动机制,提出用伺服阀代替普通换向阀,利用MATLAB／Simulink建立基于压力反馈的PID控制结合门限值控制的ABS控制器,实现了ABS液压系统流量的连续调节与控制。建立了ABS系统AMESim模型,通过数据接口嵌入ABS控制器,实现联合仿真。分析了原ABS系统与改进后的ABS系统的压力冲击、活塞位移、速度、加速度等曲线特征,并进行了对比。试验结果表明：改进后的ABS液压系统对压力波动的抑制很好,抗冲击性能明显提高。     

介绍一种定模斜滑块机构

<正> 我厂设计制造了BQ—9收录机主机壳体模具,制品外形尺寸为250×240×145,四周壁厚为4mm,材料ABS,重量约600克。该件尺寸和位置精度要求高,且四周均有侧孔和凸凹筋槽等,结构较为复杂。 在模具结构设计时,我们设计了一种比     

托盘注塑模的设计

<正> 图1为铅酸蓄电池防爆罩托盘,制品属薄壁圆盘形,上部为组装部分,内有凸缘上口,外有均布的12条半圆竖筋,便于拧紧;下部为螺纹,底部有19个通气小孔。材质为ABS,黑色。现将托盘注塑模设计中的有关问题简介如下:     

简易高矩形壳注射模

<正> 一、概述 我厂生产的蓄电池壳是一个高矩形制品(136×180×411),材料为ABS,要求表面色泽均匀,外观整洁,四周壁厚均匀。 根据要求,在设计模具选定注射机时,要XS—2y—3000克以上的注射机方能生产,     

延伸喷嘴的一种改进设计

<正> 本厂生产的华意电冰箱上夹架模具,制品材料ABS,制品厂要求不能在制品正面进料,因此模具设计时,采用了上、下模反向,反面进料的结构。这样的设计使得进料口长度达360mm,采用普通的直接进料方式已无法解决,决定选用延伸喷嘴。但以往延伸喷嘴的应用,曾遇到进料口处温度难以     

椭圆护罩注塑模设计

图1为某电机塑料护罩零件图,材料为ABS(丙烯腈-丁二烯-苯乙烯共聚物)。该零件属于中等批量生产,未注公差采取MT5级精度。该制品虽然形状较简单,但其横截面呈中空椭圆形,内外都需要采用侧分型和侧抽芯机构,而且要保证侧抽的顺序进行及合模时成型零件的回位。     

MF和EDT表面对汽车铝板的成形性能影响试验

汽车铝板常见的两种表面形貌MF表面和EDT表面对汽车铝板的性能尤其是冲压成形性能影响较大。选取力学性能接近的具有MF和EDT两种表面形貌的各2种6016汽车铝板,系统研究了表面形貌对6016汽车铝板表面性能和成形性能的影响规律。试验结果表明:EDT铝板的表面粗糙度是MF铝板的2.5~4倍;EDT铝板比MF铝板有更高的成形极限FLD_0;MF和EDT两种铝板的表面摩擦系数、弯曲性能和拉深性能相近。     

Mechanism of Activation of Polymer Surfaces by Mixed Stannous Chloride/Palladium Chloride Catalysts

Mixed stannous chloride/palladium chloride catalysts are often used to activate etched ABS surfaces prior to electroless nickel or copper deposition. Little is known of the nature or activation mechanism of the catalyst. The nature of the catalyst was investigated using nephelometry and electron diffraction. No evidence for the existence of colloidal metallic palladium was found. The active component of the catalyst is thought to be a complex chloride of tin (II) and palladium (II). The major species present on the ABS surface at each step of the pretreatment cycle were identified using electron diffraction. A mechanism of activation was proposed involving hydrolysis of an adsorbed chloride complex within the ABS surface. On subsequent treatment with ammonium bifluoride accelerator, a surface redox reaction is presumed to occur between the hydrolised species forming active palladium nuclei: Sn (II) + Pd (II) = Sn(IV) + Pd (0). The process variables were also investigated. It was found that immersion times in all pretreatment solutions including rinses had a direct influence on induction period.     

透明塑料罩壳注射模设计

对透明塑料罩壳注射模结构，采用点浇口进料。模具定模型腔镶件采用了双层循环冷却方式，动模型芯镶件采用了并行隔片循环冷却方式，模具注射成型后能充分冷却，既缩短了成型周期，又提高了产品质量。     

透明锅盖注射模设计

对透明锅盖塑件进行了成型工艺分析,针对塑件结构特点和透明度要求,合理地设计了模具的浇注系统、冷却系统和斜导柱抽芯机构等,对推板、推杆二次推出机构进行了重点介绍。实践证明,模具结构合理、动作可靠、塑件质量满足设计要求。     

Moldflow在汽车置物箱翘曲变形分析中的应用

利用Moldflow的MPI/Warp分析模块对汽车置物箱进行模拟,预测其成型后的翘曲变形,通过正交试验法对塑件成型工艺参数进行优化。结果表明:当材料为Teijin TN_3813BL PC+ABS,保压压力为注射压力的95%,模具温度65℃,熔体温度270℃时,塑件翘曲变形最小,影响塑件翘曲变形的主要因素为材料的性能,其次为熔体温度、保压压力和模具温度。     

Comparison Between Structures and Properties of ABS Nanocomposites Derived from Two Different Kinds of OMT

In the present work, the hexadecyl triphenyl phosphonium bromide (P16) and cetyl pyridium chloride (CPC) were used to modify montmorillonite (MMT) based on the structural characteristic of the engineering thermoplastic acrylonitrile-butadiene-styrene copolymer (ABS) and the principle of “like dissolves like”, and then used to prepare the ABS/organic-modified montmorillonite (OMT) nanocomposites by melt-intercalation method. The influences of two different kinds of OMT on the structures and properties of the ABS nanocomposites were characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution electron microscopy (HREM), thermogravimetric analyses (TGA), Cone calorimetry and dynamic mechanical analyses (DMA), respectively. The increased basal spacing showed that ABS intercalated into the gallery of the OMT. The morphology indicated that the OMT dispersed well in the ABS resin and the intercalated structure for ABS/OMT-P16 nanocomposites and intercalated-exfoliated structure for ABS/OMT-CPC nanocomposites were respectively formed. The TGA results revealed that onset temperature of thermal degradation and charred residue at 700 °C of the ABS nanocomposites was remarkably enhanced compared to the pure ABS. It was also found from the Cone calorimetry tests that the peak of heat release rate (PHRR) decreased significantly, contributing to the reduced flammability. The DMA measurements indicated that the loading of silicate clays improved the storage modulus of the ABS resin. The partial exfoliation of the OMT-CPC within ABS nanocomposites was advantageous to increasing thermal stability properties, decreasing flammability properties, and improving mechanical properties.     

Rapid method to determine suitability of ABS plastics for metallisation

In this study, the metallisation of acrylonitrile–butadiene–styrene (ABS) plastics has been investigated. The adhesion of the metallic layer on ABS was studied by the cross-cut test. Raman spectroscopy was used to evaluate the components of ABS plastics. The results indicate that Raman spectroscopy can be applied for rapid determination of suitability of ABS plastics for metallisation.     

碳酸氢钠中和法制备拟薄水铝石

利用NaHCO3溶液与铝酸钠溶液进行酸碱中和反应来制备拟薄水铝石,结合二氧化碳气体沉淀和酸碱中和法的特点,制备的产品具有孔径集中,粘结性能好,胶溶好,在稀酸溶液中形成高浓度的透明胶体的特性。可用于FCC作催化剂粘结剂,和涂敷用氧化铝以及高级纸张的涂料等。