一种大型砂芯磨芯机的设计

一种大型砂芯磨芯机的设计温立新张爱兰李历生（山东济南市：２５００６３济南柴油机厂）主题词：砂芯磨芯机设计在铸造生产过程中，有些砂芯是由两个或多个砂芯合装而成。因在砂芯制造过程中产生误差或因烘干而产生变形，其接合面的精度（主要指平面度）较差，常使铸件（...     

冷芯盒活块抽出机构的设计

冷芯盒活块抽出机构的设计姚永年（上海市：２００４３２上海柴油机股份有限公司）主题词：芯盒活块抽出机构设计上海柴油机股份有限公司铸造厂气缸盖水道砂芯（夹层砂芯），原采用手工油砂造芯。由于砂芯形状复杂，操作比较困难，生产率较低；同时砂芯需经烘干硬化，变形...     

铝合金框架铸造砂芯的分块成型设计

以某铝合金框架为例,依据复杂铸件铸造砂芯分块设计的简单分块原则,结合框架的结构和材料,以及砂芯的制造特点,论述了基于Pro/E的铸造砂芯分块成型设计过程,总结了行之有效的方法和经验.结果表明,采用Pro/E软件辅助设计,可提高铸造砂芯的设计效率,并为分块砂芯的模具和成型设计提供依据.     

弯管接头的砂芯设计

本文通过分析弯管接头的结构，提出了几种砂芯的设计方法，解决了砂芯在铸型中定位的问题，并给出了Ｔ型双承弯管的最小弯曲半径的求解方程式。     

砂芯自动修芯系统的设计与实现

针对现有砂芯制作工艺流程中人工修芯生产效率低、砂芯外形一致性差的问题,设计了一种自动砂芯修芯系统.基于双针浮动打磨技术和工业机器人技术设计了打磨机构,实现对砂芯坯缝线的去除.设计了带有弹簧定位夹紧机构的工装板,以实现砂芯阵列的定位与夹紧.设计了倍速链机构,以直线循环方式实现工装板在各个工位的流转与顶升定位.测试结果表明...     

吹气硬化法芯盒工装设计

介绍了用于吹气硬化法的典型液压换向阀阀芯砂芯的芯盒设计方法。由于选用芯盒材料、采用自动扎通气孔及安排射砂与吹气排气道的恰当，制出了优质合格砂芯。     

吹气硬化法芯盒工装设计

介绍了用于吹气硬化法的典型液压换向阀阀芯砂芯的芯盒设计方法。由于选用芯盒材料、采用自动扎通气孔及安排射砂与吹气排气道的恰当，制出了优质合格砂芯。     

增压器中间壳砂芯三向顶出制芯工艺优化

增压器中间壳砂芯结构复杂,按照常规设计,一次性分型开模无法制出砂芯。采用三向顶出技术,优化了砂芯分型工艺;同时增加螺纹钢作芯骨,防止了因中间壳中轴孔段细长而发生轴孔段砂芯断裂的问题。     

3D打印的气缸盖砂芯

介绍了3D打印的某型柴油机气缸盖铸件砂芯的设计。采用3D打印的砂芯,替代传统的组芯方式,将关键砂芯做成1个整芯。有效避免了铸件因多个砂芯配合的累积误差导致的尺寸不合格,同时降低浇注过程中砂芯晃动导致呛火的概率。     

砂芯无框工艺在自动化生产中的应用

介绍了砂芯无框工艺在气缸盖砂芯自动化生产中的应用,进行了以下工艺设计:(1)将夹具统一设计成左右夹持的方式,增加一个支撑力把砂芯撑起;(2)采用顶针定位,在顶针上安装可拆卸的定位销板;(3)下芯后夹具要退让出来,需要配合的砂芯做出退让的空间。生产结果显示:取消了水套芯的边框,突破了机器人只能夹持砂芯边框的问题,有效降低了生产成本,成功解决了高效生产与高成本的矛盾,但对砂芯与外型配合的精度有一定要求。     

GPU based numerical simulation of core shooting process

Core shooting process is the most widely used technique to make sand cores and it plays an important role in the quality of sand cores. Although numerical simulation can hopefully optimize the core shooting process, research on numerical simulation of the core shooting process is very limited. Based on a two-fluid model (TFM) and a kinetic-friction constitutive correlation, a program for 3D numerical simulation of the core shooting process has been developed and achieved good agreements with in-situ experiments. To match the needs of engineering applications, a graphics processing unit (GPU) has also been used to improve the calculation efficiency. The parallel algorithm based on the Compute Unified Device Architecture (CUDA) platform can significantly decrease computing time by multi-threaded GPU. In this work, the program accelerated by CUDA parallelization method was developed and the accuracy of the calculations was ensured by comparing with in-situ experimental results photographed by a high-speed camera. The design and optimization of the parallel algorithm were discussed. The simulation result of a sand core test-piece indicated the improvement of the calculation efficiency by GPU. The developed program has also been validated by in-situ experiments with a transparent core-box, a high-speed camera, and a pressure measuring system. The computing time of the parallel program was reduced by nearly 95% while the simulation result was still quite consistent with experimental data. The GPU parallelization method can successfully solve the problem of low computational efficiency of the 3D sand shooting simulation program, and thus the developed GPU program is appropriate for engineering applications.     

THE DEVELOPMENT OF A MICROCOMPUTER PROGRAM FOR THE THREE-DIMENSIONAL NON-LINEAR FEM

This paper presents a microcomputer program system for the three-dimensional non-linear finite element method (FEM), which is developed for applications in mining engineering, such as excavation, filling, caving, damming, etc. Our attention is focused on some of the key aspects of the programing techniques for an applicable microcomputer program, such as the structure of the program, data processing in the core, communication between the core and mass storage, input and output systems, etc. In the last part of this paper, two test examples are presented verifying the computational accuracy of this programing system and illustrating its applicability in practical engineering.     

基于AT89S52单片机的普通机床数控化改造

本文以AT89S52单片机为控制核心,介绍了一种两坐标轴联动的经济型数控机床改造方案.该方案以步进电动机作为机床伺服系统,并说明了数控系统的硬件组成框图与主要模块以及步进电动机的输出控制程序等.     

浅谈眼镜架模芯数控编程

基于MasterCAMX4软件,在眼镜架模芯数控编程时,对边界设定的几种情况作具体分析,为广大数控编程师提供了很好的建议。     

一种比例换向阀先导级用高速开关阀运动特性分析

为研究一种用于比例换向阀先导级的高速开关阀运动特性,通过编写UDF程序控制流体力、弹簧力和电磁力共同作用下的阀芯运动;通过动网格技术实现阀的流固耦合仿真,并获取阀芯精确的运动情况以及瞬态流场的变化。结果表明：编写的UDF程序能够精确地模拟实际工作时的阀芯运动状态,获得阀的开启时间为1.8 ms。该研究方法能够获得高速开关阀精确的运动特性,为高速开关阀产品的优化提供指导。     

基于PowerMILL的数控加工技术在塑料模具制造中的应用

介绍了利用DELCAM在软件编制吹风机外壳模具数控加工程序的过程,并介绍了PowerMILL软件中的一些加工策略。分析了模具型芯的加工工艺,并探讨了DELCAM软件中PowerMILL模组的应用。     

摩托车制动器拖滞力矩检测系统的研究与应用

利用PLC作为核心控制器,触摸屏为上位机,设计了摩托车制动器拖滞力矩检测控制系统。详细分析了该系统的机械结构和工作原理、PLC程序控制流程和工控组态软件的设计,实现了对摩托车制动器拖滞力矩的准确检测和装配线上工作质量的控制,同时为新产品的开发提供有效的检测数据,使产品的技术参数指标达到更高的要求。     

Diagnostic technique for laser micromachining of multi-layer thin films

Excimer laser micromachining was a key process for producing features by removing parts of some photoresist layers. One hurdle was that the lower substrate layer was easily attacked or damaged in laser ablation of the upper photoresist layer. To overcome this, a real-time monitoring scheme of laser micromachining process was proposed on the basis of taking acoustic emissions arising from pulsed laser–material interaction as feedback signals and employing a diagnostic program. It was showed that extracted features (e.g. the RMS values) from sensor signals were indicative of the process. In particular, the feature values tended to have an abrupt change when laser beam approached the interface of consecutive two layers. Relying on this characteristic, we proposed a fuzzy expert system as the core part of the diagnostic program. The effectiveness of the program was verified with tests.     

基于复合建模的生产设备寿命周期管理系统研发

以某制造型企业生产设备管理研发需求为背景,在对设备整个寿命周期管理现状进行详细调研和分析的基础上,识别其核心业务流程,并根据企业实际情况进行业务流程再造,应用复合建模技术进行了系统建模,并采用分层设计和可视化编程技术开发了系统程序。测试结果表明:采用该系统实现了对生产设备整个寿命周期的管理。     

落地扇前盖注射模型芯型腔的数控编程与电极设计

详细介绍落地扇前盖注射模型芯型腔的数控编程方法与数控加工工艺过程,及相关电极的设计制造。通过实例分析总结具有复杂曲面的模具数控加工策略。