TiAlN涂层铣刀铣削9SiCr钢切削性能试验研究

采用TiAlN涂层刀具,对合金工具钢9SiCr的高速铣削加工性能进行试验研究,分析铣削速度对铣削力、表面粗糙 度、表面形貌、切屑变形和刀具的磨损的影响。并获得能够保证对其进行高效高精度加工的合理工艺参数。     

可复用工艺设计中的零件信息模型

可复用工艺设计是我国加速企业信息化进程,提高CAPP系统开发效率的重要环节。分析零件特征及特征之间 的关系,建立零件综合信息模型,将工艺知识面向设计过程重新组合,服务于可复用工艺设计的各个子任务,对于解决工 艺系统客户化工作量大、充分提高工艺知识的可复用性有很好的理论价值和现实意义。     

铣头自动交换技术在A/C轴双摆角铣头中的应用

针对A/C轴双摆角铣头的结构特点,研究了A轴自动交换过程中的A轴自动交换原理、对接元件的对接过程、对接元件的过定位问题以及A轴与铣头库的定位问题。通过对样机试制与实验验证,充分证明了该技术的合理性。     

Detection process approach of tool wear in high speed milling

The cutting tool wear degrades the quality of the product in the manufacturing process, for this reason an on-line monitoring of the cutting tool wear level is very necessary to prevent any deterioration. Unfortunately there is no direct manner to measure the cutting tool wear on-line. Consequently we must adopt an indirect method where wear will be estimated from the measurement of one or more physical parameters appearing during the machining process such as the cutting force, the vibrations, or the acoustic emission, etc. The main objective of this work is to establish a relationship between the acquired signals variation and the tool wear in high speed milling process; so an experimental setup was carried out using a horizontal high speed milling machine. Thus, the cutting forces were measured by means of a dynamometer whereas; the tool wear was measured in an off-line manner using a binocular microscope. Furthermore, we analysed cutting force signatures during milling operation throughout the tool life. This analysis was based on both temporal and frequential signal processing techniques in order to extract the relevant indicators of cutting tool state. Our results have shown that the variation of the variance and the first harmonic amplitudes were linked to the flank wear evolution. These parameters show the best behavior of the tool wear state while providing relevant information of this later.     

试验设计在热处理生产中的应用

对5CrMnMo退火工艺进行试验设计,并通过一系列实验得出大量数据,对数据进行正确分析后,结合实际生产条件,选出最优工艺参数,并进行推广运用,获得了可观的经济效益。     

基于DSM的产品设计过程建模研究

良好的过程模型是产品开发成功的关键。设计结构矩阵(DSM,DesignStructureMatrix)以任务信息依赖为中心,突出任务执行次序,为产品设计提供了一种有效的过程建模方法。这里在介绍设计任务间的依赖关系、DSM、设计迭代的基础上,以二级同轴减速器轴系模块的设计为例,详细描述了任务分解、设计结构矩阵的构建和优化、交互型活动解耦等过程,并给出了基于设计结构矩阵的过程模型。最后对设计结构矩阵提出了若干扩展意见。     

面向工艺的特征设计与集成技术研究

针对CAD/CAPP系统直接集成所存在的困难,提出了在三维环境下,面向工艺的特征设计与CAD/CAPP集成方案;分析了集成过程中特征的分类与定义、面向工艺过程的特征设计方法、特征模型与CAPP系统中工序模型的关联、特征信息与工艺信息的关联等关键技术;给出了在此集成系统下的应用实例。该方法为CAD/CAPP系统的集成提供了一种有效的途径。     

FANUC Cs轮廓控制在功能头定位中的应用

论述了FANUC系统的Cs轮廓控制在功能头定位中的优点及应用实例.     

Active suppression of chatter in peripheral milling. Part II. Application of fuzzy control

In this paper, a feasibility study is conducted where fuzzy logic control is investigated to actively vary spindle speed modulation parameters for chatter suppression. A justification for using fuzzy control is given, as well as a brief synopsis of the fuzzy inferencing mechanism. Proportional and proportional-integral fuzzy control algorithms are developed. The set point in these controllers is established from experimental observations and measurements of the machined surfaces. Controller performance is tested by simulating changes in the axial depth of cut from a stable depth to 20% and 50% beyond the stable limit for constant speed cutting. It was found that both controllers were able to regulate the vibration in the milling process, however, the proportional-integral controller generally exhibited more desirable performance characteristics.     

多齿圆周铣削残留面积高度研究

提出了一种非简化的多齿圆周铣削几何运动模型,该模型考虑进给速度对刀齿运动轨迹的影响,发现在多齿圆周铣削中存在残留面积的现象,并推导出计算残留面积高度的公式,公式表明多齿圆周铣削的残留面积高度与刀具齿数、每齿进给量和刀具半径有关;然后以残留面积高度公式为基础,利用Visual C++(MFC)为平台开发出计算和辅助分析残留面积高度的系统;最后采用Matlab仿真软件验证非简化模型的合理性和在多齿圆周铣削中存在残留面积.     

Hydrodock拉钉自锁原理及其在铣头自动交换技术中的应用

研究了Hydrodock拉钉的工作原理,计算了拉钉松开状态正行程与拉紧状态反行程的机械效率,并求解出松开状态正行程与拉紧状态反行程的自锁条件,分析了Hydrodock拉钉在铣头自动交换技术应用中的技术要点。     

基于QFD及TRIZ的概念设计过程研究

提出了由用户需求建立质量功能布置 (QFD)中的第一个质量屋 (HOQ) ,经功能分析建立第二个HOQ ,由其中敏感矩阵的负相关项确定设计冲突及其类型 ,在发明问题解决理论 (TRIZ)中选择冲突解决原理并解决技术冲突或物理冲突的概念设计过程。为了方便功能分析 ,提出了功能的一种汉语表达方式。通过一个工程实例验证了上述概念设计过程     

现场型过程仪表校验仪的设计及应用

本文较为详细的说明了现场型过程仪表校验仪硬件及软件的设计方法，特别讨论了设计现场型校验仪所采用的低功耗设计和面板校验仪所采用的低功耗设计和面板校准技术。     

Geometry-oriented knowledge-based system for preliminary process design of cold-forged parts

This paper presents an integrated architecture of a geometry-oriented knowledge-based process-design system (GEOPDE) for multistage cold forging of solid and hollow parts. It deals with the unit processes of upsetting, forward extrusion, backward extrusion and with combinations of these processes. By using the notion of group technology, the forging processes and forging part geometries are classified. With Prolog as the building tool, the inherited backward chaining reasoning was used for solving the deduction problems. The formation approach, such as “generate and test” and backtracking control strategy, was also employed for generating weighted alternative process plans. Using design rules, empirical formulae and material properties as integrated knowledge, the billet dimensions and the forging sequences are generated automatically once the product dimensions are given by the user. The developed system is a prototype expert system for the preliminary process design of cold-forged products for the forging industry.     

Application of smart passive damping system using MR damper to highway bridge structure

Magnetorheological (i.e., MR) dampers are one of the most prospective semiactive control devices for civil engineering applications to earthquake hazard mitigation, because they have many advantages such as small power requirement, reliability, and low price to manufacture. A smart passive system based on an MR damper system without including a power supply, controller, and sensors consists of an MR damper and an electromagnetic induction (i.e., EMI) system that uses a permanent magnet and a coil. The electromotive force induced by movement of a structure can control MR damper effectively without any external power supply and control algorithm. This smart passive control system is implemented to verify the effectiveness for seismic protection of benchmark structural control problem for the seismically excited highway bridge, which is based on the newly constructed 91/5 highway over-crossing in Southern California. The results of the numerical simulations show that the presented control system can be beneficial in reducing seismic responses of benchmark bridge structure.     

A computational system for process design of injection moulding: Combining blackboard-based expert system and case-based reasoning approach

The process design of injection moulding involves the selection of the injection moulding machine, mould design, production scheduling, cost estimation, and determination of injection moulding parameters. Expert system approaches have been attempted to derive the process solution for injection moulding in the past few years. However, this approach has been found to be incapable of determining the injection moulding parameters owing to the difficulty in setting the moulding parameters. In addition, the existing expert systems for process design lack the proper architecture for organising a heterogeneous knowledge source. In this paper, the combination of a blackboard-based expert system and case-based reasoning approach is introduced to make up the deficiencies of the existing expert-system approach to the process design, from which a computational system for process design of injection moulding, named CSPD, was developed and described. CSPD first derives the process solution including the selection of injection moulding machine and mould base, tooling cost, and processing cost estimation, and production scheduling based on the blackboard-based expert-system approach. It is then followed by the determination of the injection moulding parameters based on the case-based reasoning approach and the previously derived partial solution.     

轿车后盖内板拉深工艺设计

以轿车后盖内板为例,分析轿车内覆盖件拉深工艺设计的要点,并结合有限元模拟方法对后盖内板拉深成形进行评价和优化,实冲结果验证了设计的准确性.     

磨削长纤维材料用精密砂光片的线性磨点模型

针对目前长纤维生物质材料磨削和砂光工具的需求以及早期磨点数学模型的不足,建立了用于磨削长纤维生物质材料的精密砂光片中磨点的线性数学模型。详细描述了砂光盘片磨点基本单元中母点数量确定的方法、给出了母点坐标的最佳线性方程组、介绍了基本单元的组成和获取过程以及基本单元的拓展和拼接方式,最后对磨点形状、切削刃、排屑功能和占空比进行了初步设计。该研究对开发我国生物质材料及长纤维固体材料表面磨光和砂光技术具有较好的参考价值。     

薄板等离子弧三维成形的工艺方法

平面薄板的等离子弧成形提出了一种有效实用的工艺方法.方法的重要特征是它首先计算成形一个特定形状所需要的应变场,利用应变场矢量和扫描路径方向垂直的关系设计扫描路径.等离子弧热参数通过应变场与等离子弧功率和扫描速度的关系确定.此方法在成形两种不同双曲形状上的有效性已经被仿真和试验所验证.     

A computational system for process design of injection moulding: Combining a blackboard-based expert system and a case-based reasoning approach

Process design of injection moulding involves the selection of the injection moulding machine, mould design, production scheduling, cost estimation, and determination of injection moulding parameters. An expert system approach has been used to derive the process solution for injection moulding over the past few years. However, this approach is found to be incapable of determining the injection moulding parameters owing to the fragile nature of the knowledge for setting the moulding parameters. In addition, the existing expert systems for process design lack proper architecture for organising heterogeneous knowledge sources. In this paper, the combination of a blackboard-based expert system and a case-based reasoning approach is introduced to eliminate the deficiency of the existing expert-system approach to process design, from which a computational system for the process design of injection moulding, named CSPD, has been developed. CSPD first derives the process solution including the selection of the injection moulding machine and the mould base, tooling cost, processing cost estimation, and production scheduling based on the blackboard-based expert-system approach. It is then followed by the determination of the injection moulding parameters based on the case-based reasoning approach and the previously derived partial solution.