模具的表面处理技术

本文介绍了模具表面处理技术固体硼氮共渗的渗剂、工艺参数、共渗后的组织与性能及其在模具上的应用。固体硼氮共渗剂由供硼剂、供氮剂,活化剂、填充剂组成,工艺简单,便于实施,是一种可获得渗层性能好的化学热处理方法。通过固体硼氮共渗使模具表面获得了可靠稳定的硼氮共渗层,渗层由硼化物层（Fe2B、FeB）和过渡层组成,渗后可获得高硬度的硼化物层,渗层具有高的耐磨性、良好的耐热、耐蚀性。硼氮共渗技术应用任摸具的制造上可使模具的使用寿命大幅度提高。     

耐火材料成型模具的气体碳氮共渗

介绍了气体碳氮共渗技术的基本原理、基本过程和在耐火材料成型模具热处理中的应用,并分析了应用过程中可能出现的问题和解决措施。气体碳氮共渗工艺不但延长了耐火材料模具的使用寿命,而且降低了对环境的污染。虽然目前气体碳氮共渗技术的设备及其自动控制水平较高,但是关键阶段还需人工控制,因此,需要操作工人严格执行工艺规程,出现问题及时进行补救。     

轮胎模具低温气体碳氮共渗微变形技术的应用及其试验

通过对轮胎活络模具分别作传统氮化工艺技术和低温气体碳氮共渗微变形工艺技术的试验研究,获得了大量试验数据,证明了低温气体碳氮共渗微变形工艺技术不但能明显提高模具的表面硬度、耐磨性和抗腐蚀性能,尤其其废品率由15%～20%降低到5%,能耗降低20%～30%。这一工艺技术符合当今的＂低碳＂技术要求,在行业上具有广泛的应用前景。     

碳化钨硬质合金制备技术研究进展

碳化钨硬质合金具有极高的硬度和优良的耐磨性,被广泛应用于钻头、工具、模具、针头、刀具等需要耐磨损和特种加工的行业.本文详细论述了硬质合金的研究进展;重点总结了碳化钨粉体制备和硬质合金烧结技术;最后列举了碳化钨硬质合金的应用领域和发展前景.     

降低耐火制品模具费用的途径

降低耐火制品模具费用的途径ＩＹＧ硬质合金板块不同规格的ＹＧ硬质合金板块（见表１）的生产，以及合金板块与基模镶嵌、粘结技术已被成功应用，是用于大批量生产标准型或简单异型制品的高寿命模具材料。一次可生产砖坯３７～３９万块，是碳素钢模具的８０倍。如果镶嵌、...     

模具用硬质合金断裂原因及改进

模具用硬质合金断裂原因及改进西北耐火材料厂丁继军，余林山我厂用硬质合金（ＹＧ１５）取代Ａ３钢制造常规模具，但硬质合金镶片在应用过程中常出现断裂现象。原因是多方面的，主要有两个，一是基体不平，一是粘结质量不好。为此，由技术高的工人加工，以保证基体的平直...     

专利文摘

液压硫化机模具支承装置;轮胎模具五元共渗表面强化处理设备;改良的注塑机;塑料正压成型机;熔体泵挤出机.     

塑料模具表面粗糙度变化机理及影响因素分析

高温高压下塑料颗粒对模具表面的冲蚀,引起模具表面粗糙度发生变化,是造成塑料模具失效的重要原因。针对这个原因,分析了塑料模具表面粗糙度的变化机理;总结了影响塑料模具表面粗糙度变化的因素,主要包括冲蚀速率、冲蚀角度和塑料颗粒的形状与硬度;指出可以通过粒子注入技术、激光熔覆技术、碳氮共渗等技术来降低塑料模具表面粗糙度。     

碳氮共渗法强化模具的应用研究

研究了在碳氦共渗法强化模具过程中形成热扩散化学热涂层组织的规律性。     

钢结硬质合金在瓷粉料干压成型模具中的应用

文章分析了钢结硬质合金GW50的热处理工艺。提出采用ELID精密镜面磨削技术代替原来的传统磨削工艺。对钢结硬质合金模具进行精密磨削。使其能够满足产品质量要求,并提高了劳动生产率。     

SHS-produced Fe-(TiMo)C master alloy for reinforcement of manganese steel

Some steels and alloys, such as the austenite of Hadfield-type manganese steels, are very ductile, tough, and deformable, so that the industrial parts made of these materials often suffer marked geometric deformations during their service life. The problem can be resolved by reinforcing the austenitic matrix with hard, microscopically dispersed ceramic particles such as TiC. Titanium monocarbide, TiC, very hard and stable at room/high temperatures, can be readily fabricated by SHS from elementary Ti-C powders as raw materials. However, these ceramic products are prone to coalescence and have poor wettability in a molten bath, so that the product yield and subsequent property improvement are very low. These drawbacks have been overcome by synthesizing the Fe-(TiMo)C master alloy, that is, (TiMo)C complex carbide particles embedded into a metallic (Fe) matrix, which will significantly improve the mechanical properties of final product. Another goal of this work is substituting expensive raw materials (titanium, molybdenum, and iron powders) by low-cost FeTi and FeMo alloys. The results showed that manganese steels can be successfully reinforced with particles of the SHS-produced master alloy. It has been proved that the use of FeTi and FeMo for the synthesis of master alloy not only satisfies all technical requirements but also significantly reduces the production cost, thus satisfying rigorous economical needs.     

硬铝合金化学镀镍耐蚀机理

通过对铝合金组织，化学镀镍各溶液成分，化学镀镍镀层性质，铝合金化学镀镍工艺的分析，找出了影响铝合金化学镀镍耐蚀性的关键因素是镀层厚度和孔隙率，铝合金基体状态，前处理工艺，化学镀镍工艺参数，溶液成分，镀后处理等均会影响镀层的孔隙率，所以对铝合金化学镀镍耐蚀性等级要求高的行业在使用该工艺时要控制全过程工艺要点，否则就达不到预期的目的。     

复杂造型PMMA系列把手通用热流道模具模型研究

针对透明复杂造型聚甲基丙烯酸甲酯把手系列产品,提出采用热流道模具代替冷流道模具注射成型,共用热流道系统,对模架、镶件和铍铜型芯冷却装置等进行模块化组合,建立了把手系列产品的热流道注射成型模具的通用结构模型,满足把手系列产品品种多、表面质量要求高、价格低、成型周期短等要求。并选择一种典型把手进行热流道模具注射成型工艺CAE分析和生产验证,结果符合实际生产要求。     

Failure mechanism of the Y2O3 doped BaZrO3/Al2O3 composite ceramic mould during directional solidification of TiAl-Based alloys

Directional solidification of Ti–46Al–8Nb (at.%) intermetallic in the Y₂O₃ doped BaZrO₃/Al₂O₃ composite ceramic mould was carried out using Bridgman apparatus. To increase the success rate of Ti–46Al–8Nb single crystals preparation and improve the quality of the ingots, the failure mechanism of the mould in directional solidification experiments was evaluated. Nucleation and propagation of cracks in the moulds were investigated by tracing each key process of the experiment, the effect of pores in the mould on the target alloy was revealed by studying the mould/metal interface. The results show that the macrocracks in the facecoat of the mould would lead to the leakage of the alloy melt. Furthermore, the alloy melt would infiltrate into the mould through large-size pores, which would increase the oxygen content of the target alloy, and also form inclusions containing O, Zr, Si and Y elements in the alloy ingot.     

氨基磺酸盐镀液在结晶器铜板电镀中的应用

简介了结晶器在板坯连铸中的应用,以连铸机结晶器表面处理为例,概述了氨基磺酸盐电镀Ni、Ni-Fe合金和Co-Ni合金镀层。镀层内应力小且硬度适中,镀厚性好。与裸Cr-Zr-Cu板相比,提高结晶器寿命2倍以上。合金镀层的综合性能比Ni镀层更高,将得到越来越广泛的应用。     

多注射头集成电路(IC)塑封模具的研制

针对传统单、双注射头塑封模具存在的流道长不易注满型腔,塑封料需要预热,更换模盒麻烦等缺陷,设计开发出一种新型的多注射头塑封模具,并以电子产品PC817为例,重点介绍了塑封模具总体结构、模盒、注射系统和注射板平衡设计的技术要点。     

Morphological study of the structure developed during the polymerization of a series of segmented polyurethanes

The morphology developed during the polymerization of a series of linear polyurethanes ranging from 10–77% by wt. hard segment has been characterized by a variety of techniques. The polyurethanes were batch reacted using poly (propylene oxide) endcapped with poly(ethylene oxide) as the polyol, 4,4′-diphenylmethane diisocyanate and 1,4-butanediol. Hard segment-rich globules and two types of hard segment spherulites have been observed. The size and number of these microstructures depends on cross-sectional location in the mould and hard segment content. A possible polymerization scheme to account for the complex sample morphology is discussed. The importance of these structures on the mechanical properties is illustrated.     

稻壳综合利用前景展望

据实验及近期文献介绍,本文详实地阐述了以稻壳为主要原料的四种化工及高科技产品的制造过程。并从原料来源、加工过程的难易程度、可制得的产品种类及其应用范围、经济效益等方面展望了稻壳综合利用的前景。     

A Tunable Nanoimprint System to Create New Features

Fabrication of different patterns based on the same nanoimprint mould is very attractive due to the time and cost consumption of fabricating hard mould. This paper demonstrates a tunable photo‐curing nanoimprint system to create new features based on the same polydimethylsiloxane (PDMS) mould and a Ti‐containing resist synthesized by titanium (IV) ethoxide and 2‐(methacryloyloxy)ethyl acetoacetate. The resist exhibits very high oxygen RIE resistance and is able to take the place of traditional polysiloxance based resists to fabricate high‐aspect‐ratio patterns. The resist also has a low shrinkage (about 2.45%) and a high Young’s modulus of 10.85 GPa after photo‐curing. High polarity contrast of PDMS and Ti‐resist makes the release process freely and PDMS mould can be directly used without further anti‐stick treatment. A number of new features are imprinted into Ti‐resist based on the same PDMS mould by controlling the deformation and the stretched PDMS mould can be repeatedly used after relaxation.     

代硬铬镍基合金镀层的研究进展

为了实现清洁生产,改善生态环境,针对电镀行业中严重污染环境的六价硬铬电镀工艺,广大电镀工作者致力于代硬铬工艺的开发,其中电沉积合金镀层技术将是未来比较理想的代铬工艺.文中综述了近几年来国内外代铬镀层的最新研究进展.重点探讨了几类代铬合金镀层的工艺及耐磨、耐蚀等性能,并指出了目前存在的问题及今后的研究方向.