模具零件电镀失效机理分析及控制方法研究

针对电镀后模具零件型面出现开裂的问题,介绍了模具零件电镀的工作原理,并从模具结构强度、母材金相组织、模具热处理工艺及电镀过程的氢脆控制等方面剖析了模具零件开裂失效的机理。在此基础上,提出了优化铸件合金配比、电镀前模具零件型面裂纹检测与修复等改进措施并开展工程试验。试验结果表明,通过采取以上措施,避免了模具零件电镀裂纹的产生并延长模具铬层的使用寿命,可为提升模具零件电镀质量与汽车覆盖件成形质量提供借鉴。     

参数化成组技术在模具CAD系统中的应用

针对模具零件的特征,运用成组技术对模具零件进行了分析,并用人工智能语言编写了模具零件的参数化程序,运用参数化成组技术设计了模具CAD系统。     

屏蔽罩级进模设计

分析了屏蔽罩零件的成形工艺,介绍了零件排样、模具结构设计和模具关键零件的详细结构设计。模具结构可靠,设计合理,能保证生产零件的质量,满足大批量生产要求。     

锥形卡环多工位级进模设计

介绍了锥形卡环的成形工艺、零件排样和模具结构,对模具主要零件结构设计要点进行了阐述。模具结构紧凑、合理,生产的零件质量良好。     

无声链链板级进模设计

分析了链板的冲裁工艺,介绍了零件排样、模具结构、模具工作过程及模具关键零件的设计,经生产实践证明:模具结构合理,生产效率高,操作简便,能够满足零件质量和生产的需要。     

模具行业飞速发展的机遇

<正>1模具行业概述模具是用来成形零件的工具,这一工具由各种零件组装而成,不同的模具由不同的零件组成。它主要通过所成形材料物理状态的改变来实现零件外形的加工。按所成形零件的材料不同,模具可分为金属模具和非金属模具。金属模具又分为:铸造模具(有     

DG按钮套拉伸级进模设计

通过对DG按钮套零件的拉伸工艺进行分析 ,确定了该零件冲压工艺流程 ,同时对模具结构、模具工作过程和模具关键零件的设计要点进行了介绍。     

打印机弹片级进模设计

介绍了弹片零件的成形工艺、排样设计和模具结构设计,模具主要工作零件为镶拼结构,重点介绍了模具弯曲部分的结构,采用浮顶块将零件抬起,通过斜楔滑块机构完成零件的弯曲,解决了零件45°角成形困难的问题。     

一种导轨形零件翻边成形模具

介绍了一种导轨形零件两侧同步翻边成形的模具结构。该模具结构能够一次性完成零件从平板料片到导轨形零件的加工。利用这种模具结构可以使翻边刀块在向下运动的过程中做一定弧度的旋转,从而在一序模具上完成零件成形加工内容,降低了模具的成本以及零件的生产成本,同时能够保证零件的加工精度。     

参数化成组成技术在模具CAD系统中的应用

针对模具零件的特征，运用成组技术对模具零件进行了分析，并用人工智能语言编写了模具零件的参数化程序，运用参数化组技术设备了模具CAD系统。     

An intelligent approach to inspection qualification

In safety critical components, the capability of an inspection may need to be demonstrated by an independent process of inspection qualification (IQ). Due to the skill level of the manpower involved, IQ is both costly and time consuming. Therefore, an approach that can aid the production of the required documentation would be beneficial. This paper presents a practical example in the form of a case study, which demonstrates how an intelligent approach to IQ, utilising smart software operating within the context of a non-destructive testing Workbench, can be used to evaluate the capability of an ultrasonic inspection. This is accomplished using four interactive software tools which include: a beam-coverage analyser, a worst-case defect search engine, a flaw modelling expert system and a case-based reasoning system to retrieve previously measured data. This paper discusses the motivation for such an approach and the benefits it provides.     

Influence of an aerated/anoxic transient phase on the long-term corrosion of iron

This paper deals with the influence of an aerated/anoxic transient phase on the corrosion of ferrous matters. Actually in the context of radioactive waste disposal, metallic components could be exposed to fluctuating environmental conditions that could change the corrosion mechanisms and influence the corrosion rates. Archaeological analogues corroded in an aerated soil were exposed to an aerated/anoxic transient in an isotopic labeled solution. The corrosion mechanism in anoxic conditions does not seem to be influenced by the pre-existing thick corrosion layer formed in an aerated environment and the estimated corrosion rate is of few micrometres per year.     

Construction,Representation, and the Embodiment of Knowledge,Meaning, and Symbols in Neural Structures: Towards an Alternative Understanding of Knowledge Representation and Philosophy of Science

In this paper an alternative concept and understanding of knowledge representation in neural networks is presented. It is based on the assumption that (natural or artificial) neural structures are responsible for the generation of an organism's behavior which is in interaction with its environment. This requires a completely new interpretation of neural systems as knowledge representing devices. The concepts of constructivism second-order cybernetics, embodiment of knowledge and functional fitness play an important role in this context. The idea of an structural isomorphism between the environment and representing structures will be given up in favor of a more sophisticated epistemological concept and constructive relation. As an implication knowledge becomes system relative and ‘private’— an alternative understanding of language, symbols, communication, etc., which is based on these epistemological and neuroscientific ideas will be discussed.     

Infrared thermographic investigation of railway track ballast

A theoretical study was undertaken to determine if infrared thermography is an appropriate method to identify the condition of railway track ballast. Within this study the optimal conditions for an infrared survey were established.A laboratory experiment was undertaken to identify clean and spent ballast using an infrared camera. By cooling the ballast and watching it heat up to room temperature over time a difference in the rate of heat transfer between the two types of ballast was observed.A field trial of the infrared camera was undertaken over an operational track as part of the work within a normal track maintenance possession. The field trial identified an area of dirty ballast within a section of clean ballast and the findings were also confirmed by using ground penetrating radar and a trial pit. The laboratory and fieldwork are described in detail and sample infrared images as well as visual images of the same area are given — along with calculated values for the emissivity.The findings proved that it is possible to calibrate an infrared camera so that it can determine the condition of the ballast. Also from the success of the field trial it was shown that infrared thermography is a suitable method of identifying the condition of ballast on an operational track     

Conversion of energy under conditions of electroisothermal convection

The physical aspects of the conversion of electric energy into mechanical energy (an EHD pump) and mechanical energy into electric energy (an EHD generator) are described. Examples of the practical design of such converters are given: an EHD pump at an “electric wind” in a poor conducting liquid; an EHD wind generator; an EHD flowmeter generator; a Kelvin generator. The obtained results can be used as a basis for the development and design of working EHD energy converters.     

谈工业控制电气伺服驱动技术及其发展

交流伺服系统作为现代工业生产设备的重要驱动源之一,是工业自动化不可缺少的基础技术。作为工业控制装置的重要功能部件,伺服驱动装置的特性一直是影响其性能的重要指标。本文阐述了伺服驱动系统的基本概念、分类及其特性;步进电机和交流伺服电机的使用性能;以及伺服驱动产品在工业生产中的应用状况;同时指出了伺服控制系统逐渐成为工业设备的重要驱动源及伺服驱动系统的发展方向。     

Effect of eccentricity of twist drill and candle stick drill on delamination in drilling composite materials

Drilling is the most frequently employed operation of secondary machining for fiber-reinforced materials owing to the need for structure joining. Delamination is one of the serious concerns during drilling. Practical experience shows that an eccentric twist drill or an eccentric candle stick drill can degrade the quality of the fiber reinforced material. Comprehensive delamination models for the delamination induced by an eccentric twist drill and an eccentric candle stick drill in the drilling of composite materials have been constructed in the present study. For an eccentric twist drill and an eccentric candle stick drill, the critical thrust force that will produce delamination decreases with increasing point eccentricity ξ. The results agree with industrial experience. The need for control of drill eccentricity during drill regrinding has been proved analytically by the proposed models.     

Relationship between half-cell potential and corrosion level of rebar in concrete

This work studies the influence of various parameters, such as temperature and humidity, fly ash content and chloride concentration, on the relationship between half-cell potential and the corrosion level of rebar in concrete. Results show that the half-cell potential decreases with an increase in temperature under the same corrosion level of rebar, and half-cell potential decreases with an increase in corrosion level of rebar under the same temperature. The half-cell potential decreases with an increase in chloride concentration and increases with an increase in fly ash content when fly ash content is lower than 50% under the same corrosion level of rebar, and the half-cell potential decreases with an increase in the corrosion level of rebar under the same chloride concentration and fly ash content.     

2000MW级风电行星架大型铸钢件的铸造工艺优化设计

分析了2000MW级风电行星架大型铸钢件铸造生产过程中出现的缩孔缺陷的成因.提出了消除该类缺陷的几种主要工艺措施和方法:浇注位置的合理选择、浇注系统的优化设计、冒口系统的改进、冷铁的优化设置、浇注工艺的改进等措施.通过采用这些措施,有效地消除了铸件的缩孔缺陷.     

汽车内分型模具设计分析

结合某汽车后左右饰条分析了内分型模结构,斜顶块与镶件的运用解决了分型线的问题,批量生产后证明模具结构可靠,动作平稳,脱模顺畅,产品外观得到有效保证,达到了最初设计的效果。