模具工作零件常用表面强化技术

综合介绍各种模具表面改性或涂覆镀层的强化方法,除传统的渗合金元素法外,还介绍了电化学沉积、放电表面处理、激光表面强化等新技术。分析了各种方法的特点以及最终取得的综合效益。     

表面强化技术与模具寿命

综述了现代表面工程系统中表面强化技术，介绍了该技术在模具延寿领域的应用，建议加速这些技术在模具领域的应用研究。     

模具表面强化技术及其应用

阐述了模具表面强化技术的发展概况及其对模具使用寿命的重要作用，重点介绍了形变强化、TD处理、激光强化、覆层强化及离子注入等模具表面强化新技术及应用。     

模具表面强化技术及其应用

阐述了模具表面强化技术的发展概况及其对模具使用寿命的重要作用，重点介绍了形变强化、TD处理、激光强化、覆层强化及离子注入等模具表面强化新技术及应用。     

模具表面强化技术的应用与模具寿命

在指出模具表面强化的重要意义的同时，介绍了多种对模具表面进行改性或涂覆镀层的强化方法，以及最终取得的综合效益。     

模具表面强化技术及其应用

阐述了模具表面强化技术的发展概况及其对模具使用寿命的重要作用，重点介绍了形变强化，TD处理，激光强化，履层强化及离子注入等模具表面强化新技术及应用。     

模具表面强化新技术的应用和发展

在指出模具表面强化技术的重要意义的同时,从热喷涂、离子注入、激光表面强化、气相沉积、稀土元素、纳米表面工程等几方面介绍了提高模具使用寿命的表面强化新技术。     

表面强化技术在模具型腔的应用

介绍了国内外模具型腔面表面强化技术的方法、特点和达到的目的 ,同时还介绍了模具型腔面的工况以及表面强化的机理和发展方向。     

模具表面强化与修复技术的研究

将复合刷镀技术作为一种表面强化与修复的手段应用于热冲模具。对复合刷镀的操作工艺及合理参数选择作了探索，配制了复合刷镀液。经实验测试和生产使用，证明镀层具有硬度高、耐磨性好、红硬性高等特点，是提高热冲模具寿命、降低生产成本的重要途径。     

激光模具表面强化的应用研究

介绍了激光表面非熔凝加工的特点及应用、国内外激光表面非熔凝加工的发展与研究现状,以及激光模具表面强化存在的问题及今后的研究方向。     

Laser surface hardening of martensitic stainless steel hollow parts

This paper deals with numerical simulation and experimental validation of laser heat treatment of an industrial axisymmetric hollow mechanical part by means of a strategy based on helical tracks. This component, made of AISI 420B martensitic stainless steel, features a low wall thickness and, according to this, it is not easily treatable by means of laser surface hardening. The work carried out was aimed at demonstrating that numerical simulation allows a drastic reduction of the experimental activity and that it makes possible to prove a very high sensitivity of the results to process parameters variation.     

Age-hardening of surface aged hardening alloy

1　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｄｏｕｂｌｅｇｌｏｗｐｌａｓｍａｓｕｒｆａｃｅａｌｌｏｙｉｎｇｔｅｃｈ ｎｉｑｕｅ(Ｘｕ Ｔｅｃｐｒｏｃｅｓｓ)ｗａｓｉｎｖｅｎｔｅｄｂｙＸＵ[1,2 ] .ＴｈｅｓｕｒｆａｃｅａｇｉｎｇａｌｌｏｙｏｆＦｅ Ｃｏ Ｗ Ｍｏｗａｓｆｏｒｍｅｄｏｎｓｕｒｆａｃｅｏｆｔｈｅｉｎｇｏｔｉｒｏｎｂｙｔｈｉｓｔｅｃｈｎｉｑｕｅ[3] ,ｗｈｉｃｈｐｏｓｓｅｓｓｅｓｖｅｒｙｓｔｒｏｎｇａｂｉｌｉｔｉｅｓｏｆａｇｅ ｈａｒｄｅｎｉｎｇａｎｄｔｅｍｐｅｒｓｏｆｔｅｎｉｎｇｒｅｓｉｓｔａｎｃｅ[4 ] .Ｂｅ…     

激光强化技术在拉深模的应用

通过具体的实例,不仅阐述了使用激光强化技术解决拉深模具压边圈拉伤问题,而且通过模具材料及热处理的选择,进行激光强化处理,改变模具压边圈传统的制造工艺,并对模具的加工手段、方法、材料的选用等方面进行深入的探讨和研究.本文还阐述了激光强化处理的性能特点.模具采用激光强化技术后在使用寿命、降低废品率方面都有明显效果,数套模具验证结论显示了激光强化技术在模具应用的广泛前景.     

激光表面强化和再制造技术的研究与应用进展

激光表面技术是一种先进的表面工程技术,已越来越多地应用到工业生产中,许多关键基础部件由于采用激光强化与再制造技术实现了高性能低成本制造,并改造了传统制造方法。从材料、工艺与装备对当今国内外对激光表面强化与再制造技术的研究现状做了系统阐述,分析了存在的几个难点并提出解决途径。详细介绍了国内外激光表面技术工业应用情况,深入分析了该技术领域的发展趋势与现今所面临的挑战。     

Numerical evaluation of the reflectivity coefficient in laser surface hardening simulation

This paper reports the results concerning the simulation of a laser surface hardening process of a cylindrical surface. In particular it focuses on the problems related to the definition of the physical parameter values necessary in order to achieve an accurate and reliable simulation. The strict dependency of laser process simulation results on the physical parameters describing the target material is, in fact, a well known matter, especially considering that the values of these parameters change during the process dependently on temperature and time. Moreover in laser surface hardening this problem is even more important because melting of the target material should be avoided, surface roughness plays an important role and, sometimes, the surface is coated with absorbent layers. These factors increase the complexity of the simulations and make the evaluation of the physical parameters more difficult and critical. The results presented in this paper are obtained on AISI420B steel, coated with graphite and treated with a direct diode laser. Considering the above mentioned conditions, a plausible temperature dependent reflectivity coefficient was evaluated and its robustness was investigated. This reflectivity coefficient can be used with a good approximation for the simulation of laser hardening treatments of many carbon steels.     

Laser surface hardening of austenitic stainless steel

For the purpose of studying the possibilities of increasing the wear resistance, keeping a high level of corrosion strength, austenitic stainless steel specimens mainly containing 19.2%Cr and 9.4%Ni were two-step surface alloyed using added materials (AMs) with hard particles of carbides (WC), nitrides (TiN), and borides (TiB₂). The simultaneous melting of AM and surface layer was performed by a CO₂ continuous wave laser on a numerically controlled X-Y table. On these specimens, the microstructural characteristics, microhardness, and depth of the molten zone were determined, which allowed definition of the AM with the best hardening effect. The research continued by two-step laser surface alloying of the same base material with different effective AM quantities. The specimens were processed by continuous wave laser radiation, by multiple-pass with 35% overlap. The alloyed layers were described by light optical microscopy, x-ray diffractometry, flash spectrometry, and hardness measurement. The conditions to obtain compact surface layers with 2.5 to 3 times higher hardness than the base material were determined.     

300M钢表面强化后应变硬化特性的表征

为获得300M钢强化处理后的应变硬（软）化特性,对表面强化处理后的300M钢试样进行表面一定深度的残余应力测试和显微硬度测量。300M钢喷丸表层-基体的显微硬度变化趋势表明其应变硬化特性,且表面强化层的应变硬(软)化特性只能由显微硬度的梯度变化表征,半高宽则由于强化层位错密度不均匀、镶嵌块尺寸变化、塑性应变幅差异等原因表现出不同的变化趋势。     

对齿轮表面硬化热处理物理冶金因素的评述

为了提高齿轮的承载能力和使用寿命,普遍采用表面硬化热处理工艺,以得到高的表面硬度（强度）和良好的心部韧性,从而获得强韧结合的综合力学性能。显然,要研究齿轮的强度,首先就应当研究硬化层及心部的强度特性及其影响因素。本文就齿轮渗碳、渗氮及感应淬火的硬化层、心部基体及过渡区的物理冶金因素与齿轮的服役条件、受力状况及热处理工艺的关系进行了分析,并提出一些改进建议。     

汽车覆盖件模具非标准零件的成组技术研究

介绍了汽车覆盖件模具非标准零件的成组研究方法,利用excel软件的编程功能进行筛选,并利用UG软件进行点位绘制,生成星空图,在众多的规格中找到最常用规格,并以此进行设计和备料,减少了模具非标准零件规格,体现了成组设计的思想,较为集中的零件规格有利于模具的生产制造和管理,并降低模具制造成本。