注塑模具型腔型芯自动生成软件的开发

介绍了注塑模具型腔及型芯自动生成计算机软件的开发方法,以塑料收缩率为依据,采用设计分析语言(DAL)、将三维塑料制品的线框尺寸直接换算成型腔以及型芯的线框尺寸。     

用AGM处理摩托车速度表面板

开发了注塑模具型腔及型芯自动生成软件，该软件基于美国ＣＡＬＭＡ公司的Ｐｒ－ｉｓｍＤＤＭ图形软件系统平台，以塑料的收缩率为依据，采用分析设计语言ＤＡＬ，将三维塑料制品的线框直接换算成型腔以及型芯的线框尺寸，实现了型腔／型芯的互相交换，并成功处理了摩托车速度表面板。     

自动生成模具型腔和型芯软件的开发和应用

开发了注塑模具型腔及型芯自动生成软件。该软件是基于Prism DDM图形软件系统平台,以塑料的收缩率为依据,采用分析设计语会DAL,将三维塑料制品的线框直接换算成型腔以及型芯的线框尺寸,实现了型腔/型芯的互相转换,并成功地处理了典型的实例。     

塑料套注塑成型模具的设计

从制件和所用原材料入手，分析了塑料套的成型工艺性．确定了分型面和型腔数目，完成了注射模具浇注系统的设计，以及型腔和型芯的尺寸设计和计算。通过模具设计、制造和调试，成功地实现了塑料套的注塑成型。     

计时器盒盖注射成型模具的设计

从制件和所用原材料分析入手，探讨了计时器盒盖的注射成型工艺，进行了型腔和型芯的尺寸计算与强度计算，以及注射模具浇注系统的设计。通过模具设计、制造和调试，成功地实现了计时器盒盖的成型，     

基于特征的注射模型芯型腔自动创建实现方法

提出基于特征的注射模具型芯型腔自动创建的实现方法。介绍特征技术及特征分型面的确定方法，给出利用分型面切割模具基体获得型芯型腔的关键技术，结合SolidWorks的API达到自动创建的目的。并给出以电话机零件注射模型芯型腔为例的自动创建过程。     

确定模具制造公差的方法

塑料制件模具的成型零件(型芯、型腔等)的尺寸与误差直接影响塑料制件的尺寸与误差。因此,在模具设计中,正确、合理地确定成型零件的尺寸与公差是一个相当重要的问题。     

同步皮带塑料齿轮模具设计

通过型腔和型芯组件的结构分析与设计,在满足塑料齿轮尺寸精度、位置精度要求的同时,将型腔组件分成四段,便于塑料齿轮型腔的加工和研磨抛光,以提高塑料齿轮的表面粗糙度和满足疲劳强度的要求。采用斜顶结构解决了塑料齿轮上钩爪结构侧向分离和脱模问题。     

塑料套注塑成型模具的设计

从制件和所用原材料入手,分析了塑料套的成型工艺性,确定了分型面和型腔数目,完成了注射模具浇注系统的设计,以及型腔和型芯的尺寸设计和计算。通过模具设计、制造和调试,成功地实现了塑料套的注塑成型。     

玻璃纤维增强制件注射成型过程的模具磨损原因及规律

玻璃纤维增强聚醚酰亚胺（PEI）薄壁制件注射成型过程中,易对模具型芯产生磨损,从而严重影响制件成型品质。以某型号手机听筒薄壁制件为例,根据生产实践分析了型芯表面的微观磨损特性,采用数值计算方法研究了型腔近壁面的熔体流动行为以及型芯表面材料的冲蚀破坏形式与磨损规律。结果表明,注塑过程中型芯表面材料发生冲蚀磨损形成月牙形凹槽,型腔近壁面上的熔体流速决定了月牙形凹槽的形貌和尺寸,玻璃纤维粒子的入射角和倾角决定了型芯表面材料的冲蚀破坏形式,冲蚀磨损量随着玻璃纤维粒子侧倾角的增大不断增加,随着入射速度的增大呈指数型增加。     

基于Moldflow的注塑模流道平衡与螺杆速度曲线关系分析

在不同体积型腔的模具流道设计中,利用MPI软件对组合型腔的熔体流动进行对比分析,得到能够使注射达到尽可能平衡的流道设计。此外,再辅以螺杆速度曲线的调节,最后利用分析出的比例值确定产品流道截面的尺寸,尽可能减小了塑件的缺陷。     

薄壁壳形塑料件精密注射模设计

介绍聚对苯二甲酸丁二酯(PBT)塑料保护罩精密注射模具的设计方法.塑料件采用一模四腔、潜伏式浇口的成型方案,将模具型腔、型芯镶块分割为多镶块拼接结构,改善了小尺寸高精度成型镶块的加工性,并使用框架式预应力锁紧的固定方法,解决多镶块拼接时镶块装配精度和刚度较低的问题;采用楔面定位结构来消除侧抽芯滑块配合间隙对侧抽芯镶决定...     

Visual observation and numerical studies of polymer foaming behavior of polypropylene/carbon dioxide system in a core‐back injection molding process

Thermoplastic foaming within a mold cavity was visualized as it was conducted in an 85‐ton core‐back injection‐molding machine. The core‐back molding process moved a section of the mold just after injecting a molten polymer into the cavity, quickly reducing the pressure to enhance the bubble nucleation. The foaming behavior during core‐back was observed directly through the glass windows of the mold. In the experiments, impact copolymer polypropylene was foamed with carbon dioxide. The effects of the gas concentration and the core‐back rate on bubble nucleation and growth were investigated. It was experimentally confirmed that the bubbles disappeared when the cavity was fully packed and that bubble nucleation occurred when the mold plate was moved and the cavity pressure dropped. Faster core‐back rates and higher gas concentrations increased the number of bubbles while decreasing their size. To analyze the experimental results, a bubble nucleation and growth model was employed that was based on batch foaming. The numerical results were a reasonable representation of the experiments, and this study demonstrated the applicability of the conventional free foaming model to the industrial core‐back molding process. Many aspects of the foaming in the core‐back molding aresimilar to the behaviors observed by batch foaming. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers     

Inertia and gravitational effects in extrusion dies for non-Newtonian fluids

An analysis is presented which allows the sheet or film die designer to estimate when inertial and gravitational effects are important. General theoretical equations are developed for end fed dies with arbitrary variation of the cavity cross sectional shape, cavity taper, slot length, and gap over the width. The method assumes viscous flow and a two dimensional approximation for the cavity flow. For fluid flow properties, it is assumed only that the apparent viscosity is a single valued function of the shear rate. In the important special case of constant die geometry and power law fluids, three dimensionless numbers plus the power law index are the parameters controlling the uniformity of flow from the die. Results are presented that illustrate when die orientations with respect to gravity and when fluid inertia are important. When they are not, simple expressions for die inlet pressure and uniformity index are given.     

用原塑料制件为模芯电铸注塑模型腔工艺

介绍了用原料塑料制件为模芯电铸注塑模腔的方法和工艺。用这种方法制造注塑模型腔，具有仿真度高，经济效益好，生产效率高的优点，是一种值得推广的制模方法。