塑料模现状及发展趋势

简要介绍了国内外塑料模现状、发展趋势、市场预测以及“九五”国家规划目标与对策。     

基于Pro/E的塑料模同步化设计系统研究

采用软件Wildfire5.0和EMX7.0构建了塑料模的同步化设计系统,阐述了模具分模档的构建、模架装配的构建、上模和下模及滑块装配的构建、模具的总装配,实现了多名设计工程师同步协同设计模具结构,缩短了塑料模的设计周期,有助于提高塑料模企业的竞争力。     

大型注射模的合模机构设计

大型注射模的合模机构设计成都电子机械高等专科学校（６１００３１）阎亚林塑料模合模机构的作用是保证动模与定模之间按照正确的方向和位置闭合。在中小型塑料模中，通常都是采用导柱导向机构即能达到这一要求。然而，对于成型具有深型腔结构特征的大型塑件的模具，若只...     

第八届国际模展模具水平评述

通过对第八届国际模具技术和设备展览会参展的多工位级进模及一般冲模、汽车大型覆盖件模具、塑料模、压铸模及模具标准件等的评述,介绍了国内外模具水平的现状及发展趋势。     

MoldFlow软件在下壳体模具设计及制造中的应用

详细阐述了MoldFlow技术的重要作用及地位,介绍了MPl分析模块的作用,通过应用MoldFlow／MPI软件对下壳体模具进行CAE综合分析,显示了MoldFlow技术在模具开发过程中对于优化塑料制品设计、优化塑料模设计和优化注射工艺参数等方面所起到的显著作用。     

从模具国家级新产品推荐看我国模具技术的发展

2004年12月1日至5日，中国模具工业协会技术委员会组织有关方面专家对2004年模具国家级新产品进行了评审和推荐。参加模具国家级新产品评审推荐的共有30家企业的52副模具，主要为塑料模、冲压模、压铸模和橡胶模等四大类。     

CAD/CAE/CAM技术在现代塑料模设计制造中的应用

介绍了CAD/CAE/CAM技术在现代塑料模设计与制造中的应用,采用CAD/CAE/CAM技术可提高模具产品的设计质量、缩短模具设计与制造周期、降低产品成本。还简要介绍了并行工程、逆向工程、知识工程在塑料模中的应用,展望了现代塑料模设计制造技术的发展。     

MoldFlow软件在下壳体模具设计及制造中的应用

详细阐述了MoldFlow技术的重要作用及地位,介绍了MPI分析模块的作用,通过应用MoldFlow/MPI软件对下壳体模具进行CAE综合分析,显示了MoldFlow技术在模具开发过程中对于优化塑料制品设计、优化塑料模设计和优化注射工艺参数等方面所起到的显著作用.     

直伞齿轮精锻模齿模的设计与制造

论述了直伞齿轮精锻模齿模的设计和制造方法,该设计和制造方法及相关公式不仅对锻模适用,也适用于塑料模和压铸模等其它型腔模齿形的设计与制造。     

塑料模CAE技术发展概况

CAD/CAM技术在塑料模设计制造领域的应用缩短了模具设计制造周期 ,提高了制造质量 ,但对如何获得优化的设计方案 ,保证模具的使用性能(可否成型、成型精度、成型效率等) ,CAD/CAM技术则显得无能为力。塑料模CAE技术的出现为优化模具设计方案 ,保证模具使用性能提供了新的途径。从技术及应用角度出发 ,系统地介绍了塑料模CAE技术的概况、内涵及发展趋势。     

石膏型青铜艺术铸造

针对铸铜艺术的特点对石膏型的特怀及配制进行了试验研究;举例介绍了石膏型艺术铸造的几种方法。     

Arc-sprayed steel-faced tooling

A process for building arc-sprayed steel-faced tooling is described. Strategies to create matched die sets for injection molding applications are presented, and the issues involving backing materials, spray con-ditions, and wear resistance are discussed. Examples of stainless steel tools built with this process demon-strate improved durability over more conventional sprayed zinc-faced tools.     

ZG340－640车轮铁模挂砂工艺

在ＺＧ３４０－６４０车轮铸造中，铁模挂砂是关键的工艺技术之一。简要介绍了原车轮生产工艺，主要铸造缺陷及热裂产生；提出了铁模挂砂生产全套工艺参数，并获得了满意的质量效果和显著的经济效益     

汽车模具的型面数控加工

介绍了与刀具运动轨迹生成技术有关的几个概念,重点讨论了各种刀具运动轨迹的生成方法。如单曲面刀具运动轨迹,多曲面连续加工刀具运动轨迹,清根加工刀具运动轨迹和五轴加工刀具运动轨迹的生成方法。     

双材质汽车冲压模具铸造工艺研究

采用双浇注系统对冲压模具凸模与模座结构分开浇注,获得凸模部分为球墨铸铁材质,模座部分为灰铸铁材质的一模两材质汽车冲压模具产品.这种工艺解决了模具全部使用球墨铸铁材质造成材料成本浪费及凸模与模座分体制造后期需要加工装配的模具设计难题.     

Reduction of greensand emissions by minimum 25%―Case study

This paper describes the development of an inorganic alternative to coal or coal replacement for bentonite bonded molds(greensand molding)and the realization in an operating foundry.Through a time period of 1.5 years,Cornponenta Foundry changed in many steps from a classical green sand system to a coal free system,based on ENVIBOND(R)developed in the GO-APIC project and further development as an S&B project.At Componenta Foundry,the percentage of casting defects or scrap did not increase.There was a tendency of an increase in stress(scabbing)defects and of a decrease in penetration defects.Benzene emission is reduced by40%,odor emission has lower values(not statistically proven).Visible is less smoke in the foundry,especially at the cooling line.The benefits for health and emissions are clearly seen.     

The application of thermal sprayed coatings for pig iron ingot molds

Molds made of gray cast iron for casting pig iron ingots are subjected to severe temperature fluctuations. The main life- limiting factor for mold damage is the formation of surface cracks arising from thermal fa-tigue. Various flame and plasma sprayed coatings were investigated to extend the life of these molds. Coating materials studied include plasma sprayed ceramic coatings with bond coats as well as flame sprayed oxidation- resistant alloy powders. The results of cyclic furnace tests from room temperature to 1100 °C in air, simulating the thermal cycle in casting, indicated that failure occurred along the interface between the bond coat and the gray iron substrate because of iron oxidation, and not at the interface between the ceramic top coat-ing and the bond coating for a superalloy substrate. The field test results indicated that plasma sprayed alumina coatings with 200 μm top coating thickness are the most promising materials for pig iron casting.     

High-speed five-axis milling of hardened tool steel

This paper investigates critical issues related to high-speed five-axis milling of hardened D2 tool steel (hardness HRc 63). A forging die cavity was designed to represent the typical features in dies and molds and to simulate several effects resulting from complex tool path generation. Cutting tool materials used were coated carbide for the roughing and semi-finishing processes and polycrystalline cubic boron nitride (PCBN) for the finishing process. The effects of complex tool paths on several critical machining issues such as chip morphology, cutting forces, tool wear mechanisms, tool life and surface integrity were also investigated. The main tool failure mode was chipping due to the machine tool dynamics. A five-axis analytical force model that includes the cutter location (CL) data file for computing the chip load has been developed. The effect of instantaneous tilt angle variation on the forces was also included. Verification of the force model has been performed and adopted as a basis for explaining the difficulties involved with high-speed five-axis milling of D2 tool steel.     

基于光固化原型的燃气轮机涡轮叶片整体式陶瓷铸型设计与制备

高质量的陶瓷铸型是精密铸造中获得燃气轮机涡轮叶片的基础,而传统的陶瓷铸型制备工艺存在型芯型壳组合的装配误差和无法制造叶片内部细小冲击孔的缺点。因此,提出了一种基于光固化原型的燃气轮机涡轮叶片整体式陶瓷铸型制备工艺。首先,在分析新工艺对光固化树脂原型功能要求的基础上,确定其结构组成;其次,利用ProCAST软件模拟了燃气轮机涡轮叶片浇注过程,避免了缩松缩孔缺陷的产生,完成了光固化树脂原型的详细设计;最后,制备出了整体式陶瓷铸型,并快速铸造出燃气轮机涡轮叶片。     

Mold manufacture with plasma spraying

A process has been developed to produce molds or tooling using a steel or chrome- plated steel model. The investigation examined the effect of coating and model materials, model temperature and spray angle on the coating separation from the model surface, coating delamination, and surface quality. A polished model disk was heated and then plasma sprayed with iron, nickel, Ni- Al, or Ni- Cr- B- Si. It was found that the minimum temperature to facilitate entire coating removal was lower for steel models and varied be tween 200 and 450 °C depending on the material. However, at higher temperatures the higher bond strength produced by oxidation on the steel resulted in significant coating pullout. A chrome- plated model, heated to 600 to 700 °C, is required to produce a defect- free coating. The effect of substrate angle on open porosity is most critical for the Ni- Cr- B- Si alloy and least important for Ni- Al coatings. The sur face roughness of the plasma- sprayed molds is comparable to the corresponding models, permitting good surface detail reproducibility. Several molds and tools were produced for use in the glass, rubber, and plastics industries.