注射模斜推杆抽芯脱模机构的设计

介绍了斜推杆抽芯机构的工作原理、类型和设计要点,以某电子产品的上盖成型为例,巧妙采用斜推杆抽芯机构完成内、外倒扣的成型和抽芯,避免侧向分型,简化了模具结构。介绍了注射模工作过程和设计要点,模具结构设计合理,生产的塑件质量稳定。     

考虑误差的注射模参数化建模方法研究

以注射模内模镶拼结构尺寸链为研究对象,将封闭环尺寸设置为参数,用ANSYS中的APDL语言进行参数化建模,分析不同封闭环尺寸下镶拼结构装配应力的变化,整个过程用命令流完成。因此只要修改参数值即可完成整个模型的应力变化分析。同时提出一种模具尺寸误差分析方法和思路。     

斜推杆式嵌件注射模设计

以某新品继电器的底座部分为例,介绍了一种新颖的斜推杆式嵌件注射模。使该模具结构简化,利用斜推杆机构,代替传统的侧向抽芯机构,大幅度减小模具尺寸,使模具适合在现有的小型立式注塑机上生产,不仅为公司节约了新购设备的资金,而且大大缩短了新产品开发周期。     

《塑料注射模抽芯机构图册》

随着高分子材料科学的进步,各种具有优越性能的工程塑料已逐步得到应用.由这些高性能塑料成型的制品已应用到航空、航天、汽车、家电、电子、建筑、水利灌溉、家居艮用等国民经济各个领域,其成型制品的结构越来越复杂,质量也不断提高。目前采用注射成型工艺生产的塑料制品总量约占整个塑料制品总量的40%,而注射成型中注射模的作用是极具重要的,所以,注射模设计的质量直接影响着塑料制品的生产效率、质量及成本。     

斜齿轮塑件注射模的脱模机构设计

分析了塑料斜齿轮的传动优点和工艺特点，介绍了斜齿轮塑件注射成型模具的齿形型腔旋转式和斜齿轮塑件旋转式两类脱模机构设计。     

斜齿塑件三次脱模机构的注射模

<正> 1 模具结构及动作原理 图1为螺旋角10°左旋的斜齿塑件、由于上齿盘有两螺钉沉孔,给抽芯带来了麻烦,故模具设计成件13与件15的两块组合滑块(见图2),将件13套入件15,以30°的斜向T形槽相联接。开模时,斜导柱4作用于件15,作水平运动,与之联接的件13在水平方向因受挡块12的限制,通过T形槽的作用,只能沿斜槽垂直方向作下滑运动,(理论上是水平和垂直的复合运动。)待抽完沉孔型芯时,件15上的拉销5起作用,带动13与15一起作水平抽拔、直到不妨碍下齿盘     

基于Open GRIP对注射模推杆进行二次开发

运用Open GRIP语言对注射模推杆进行二次开发,阐述了推杆的设计要点、参数化设计的过程及应用实例分析,针对推杆标准件的系列化特点,输入相关设计参数,即可快速完成推杆的实体建模。参数化设计程序协助设计人员进行设计计算及实体建模,减少设计工作中一些重复性劳动,对轴套类零件的参数化设计具有一定的参考价值。     

文件盒注射模设计与制造

分析了扁平型全封闭式圆形盒体类塑料制品的结构特点,介绍了在内圆表面不留模具镶件镶拼痕的前提下的模内成型、分型和二次内抽芯脱模的模具典型结构设计及其制造要点。     

汽车轮盖注射模斜顶机构优化设计

通过对汽车轮盖产品结构特点分析,提出了2种新型斜顶机构,并对斜顶机构的设计方案、工作过程、加工工艺、使用效果进行了详细的阐述,充分体现了这2种斜顶机构的优越性。经过生产验证,这2种斜顶机构设计合理,动作可靠,模具使用寿命长,塑件质量稳定,完全达到技术要求。     

塑料注射模斜推抽芯机构的设计

注射模的顶出机构种类很多，如：顶杆顶出机构、顶板顶出机构、顶管顶出机构、顶块顶出机构、斜顶顶出机构等。内部抽芯可以用滑块抽芯、空间足够的用油缸抽芯、斜推抽芯等。本介绍了不同结构的斜顶出抽芯机构在塑料注射模中的应用。     

成型塑件无推杆印推出结构及注射模设计

以注射模中实现成型塑件上无推杆印的推出结构作为研究对象,通过模具结构优化并采用滑块结构减少对成型塑件的抱紧力,有助于塑件脱模,并不会在成型塑件上留下推杆印,满足成型塑件的质量要求。     

Young's modulus measurement and study of the relationship between mechanical properties and microstructure of air plasma sprayed alloy 625

The present study is a continuation of the previous research on fabrication of sandwich structures suitable for high temperature applications. The overall performance of sandwich constructions depends on the material properties of skin and core, and their geometrical characteristics. The sandwich structure consisting of a Ni alloy foam covered by alloy 625 is expected to be a good candidate for high temperature applications. Amongst various methods of applying alloy 625 skin on the foam core, thermal spray techniques are the most promising for the rapid deposition of thick sections on the both sides of the foam structure. Microstructural characteristics of alloy 625 coatings on Ni alloy foam have been previously reported. The objective of this investigation was to characterize the mechanical behavior of air plasma sprayed (APS) alloy 625 coatings deposited on Ni alloy foam. The results of tensile tests performed on the free standing as-sprayed and heat treated alloy 625 coating samples are reported. Furthermore this paper examines the available models relating the microstructure to the elastic modulus, E, of the coatings to predict mechanical behavior of alloy 625 coating. Finally, numerical results from finite element analyses performed on the coatings are presented in this study. Comparison between the results of the tensile tests, theoretical models, and numerical simulations obtained from finite element methods will help us to understand microstructural basis of the mechanical characteristics of alloy 625 coating structure.     

芯管间隙对JAC590Y高强钢矩形管绕弯成形质量的影响

为了判断JAC590Y高强钢矩形管180°绕弯时芯棒与管坯之间的间隙大小对弯管成形质量的影响,基于Dynaform软件对4种芯管间隙下JAC590Y高强钢薄壁矩形管的绕弯成形分别进行了模拟,得出了不同芯管间隙值下弯管的主要畸变参数。结果表明:在芯管间隙处于一定范围内时,弯管的宽度扩展率受芯管间隙值的影响很小,而中面高度缩减率会随着芯管间隙的增大而变大;弯管上最大的壁厚减薄率出现于紧邻距芯棒最远芯头的横截面上顶板与两侧板的交角处,选取较大的芯管间隙有助于降低弯管的最大壁厚减薄率;JAC590Y高强钢薄壁矩形管180°绕弯成形时芯管间隙率的合理范围为0. 01~0. 025。     

SMC模压成型热性能参数测定与温度场数值模拟

依据不饱和聚酯树脂(SMC)模压成型热分析理论,建立了模压成型温度场数学模型,通过差示扫描量热法(DSC)实验分析,确定了SMC的固化反应动力学参数。运用有限元分析与实验研究相结合的方法,研究了SMC模压成型过程中温度变化情况及温度场对模压成型的影响特点,对SMC模压成型工艺制度的确立提供了理论指导和依据。     

NIDDM 大鼠骨骼肌组织GLUT 4 mRNA表达及其与胰岛素分泌关系的实验研究

目的 观察非胰岛素依赖型糖尿病(NIDDM)大鼠骨骼肌葡萄糖转运体4(glucose transporter 4,GLUT4)mRNA 表达及其与胰岛素分泌的关系。方法 制备NIDDM大鼠模型,用Northern blot方法测定骨骼肌组织中GLUT4mRNA表达量;放射免疫法测定血清胰岛素含量;免疫组化法观察胰岛胰岛素阳性β细胞。结果 NIDDM大鼠骨骼肌GLUT4mRNA表达显著低下,仅为对照组的45%(P<0.01);其空腹基础胰岛素水平正常,但葡萄糖耐量试验胰岛素水平较对照组明显降低,2 h 胰岛素分泌有延迟现象;免疫组化实验NIDDM大鼠胰岛体积减少一半以上,胰岛素阳性β细胞数量明显减少。结论 NIDDM大鼠骨骼肌GLUT4mRNA表达量低下,该反应与体内胰岛素分泌水平呈现一定的正相关性。;     

Temperature field analysis and its application in hot continuous rolling of Inconel 718 superalloy

A coupled thermo-mechanical model containing metal flow and temperature field for calculating temperature variation has been developed on fourteen-pass hot continu-ous rolling of round rod for Inconel 718 alloy using 3D elastic-plastic finite element method(FEM).The temperature of characteristic analysis points in the intermedi-ate cross-section of the workpiece has been simulated at initial temperature ranging from 960 to 1000 °C and initial velocity in range of 0.15-0.55 m·s-1.Based on fi-nite element ana...     

Developments in investment casting process—A review

Investment casting has been used to manufacture weapons, jewellery and art castings during the ancient civilization. Today, its applications include jewellery/art castings, turbine blades and many more industrial/scientific components. The present paper reviews various investigations made by researchers in different stages of investment casting and highlights their importance. The paper initially highlights the investigations made on pattern wax properties, effects of blending, additives and fillers. Different ways through which pattern properties (like surface finish, dimensional accuracy, etc.) could be enhanced by properly controlling the injection processing parameters are thoroughly discussed. The paper also looks into the investigations made to enhance the strength, surface finish, etc. of ceramic shell for ferrous alloys/non-ferrous alloys as well as superalloys in investment casting. Investigations made on incorporation of nylon fibers and polymer additions confirm that a ceramic shell reinforced with nylon fibers attains additional permeability compared to the one with polymer additions.