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Developmental Study of Expert Systems for Die-Life Estimation in Hot Forging

热锻模具寿命估算专家系统的发展研究

基本信息

批准号：
61550099
负责人：
SAIKI Hiroyuki
金额：
$ 1.28万
依托单位：
KUMAMOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550099/
关键词：
Hot Forging Die Forging Die Life Estimation 熱軟化エキスパートシステム

项目摘要

The life of forging die in hot closed forging is mainly governed by the softening of the die surface. The precise estimation of the temperature field within the die is of essential importance to close tolerance forging of machine elements. The temperature field is controlled by the thermal contact and cooling conditions of the die surface, but the realistic or practical values of the thermal contact conductance of the die-orkpiece interface is not well known yet. In upset-forging process in workshop,therefore,seven thermocouples are used to measure the sub-surface temperatures during the forging run. The surface of the dies were cooled and lubricated with water, water-based lubricant and oil-based lubricant. And also, a specially designed die life testing apparatus was used to estimate the softening resistance of six kind of tool materials. The contact thermal conductance were estimated by comparing the temperatures in the die due to experimental and theoretical. On the bases of these data obtained, five programs to aid the estimation of die life are developed. These are:1)Automatic mesh generator for finite element analysis for 4- and 8- nodes quadrilateral element and 8-nodes hexahedron element.2)Program for solving heat conduction problems in the forging diewhich includes the estimation of softening state of the die.3)Program for solving thermal stress of forging die.4)Program for estimating the thermal conductance between die and workpiece.5)Three dimensional graphics to display the geometry of the forging dies and the distribution of the temperature, strain, stress, hardness etc.All programs are executed on a personal computer of NEC-9801-VM2 with NDP8087.

热闭式锻造中锻模的寿命主要受模具表面软化程度的影响。模具内温度场的精确估计对于机器元件的紧公差锻造至关重要。温度场由模具表面的热接触和冷却条件控制，但模具-工件界面的热接触传导的真实或实用值尚不清楚。因此，在车间镦锻过程中，需要使用七个热电偶来测量锻造过程中的亚表面温度。模具表面用水、水基润滑剂和油基润滑剂冷却和润滑。此外，还使用专门设计的模具寿命测试装置来评估六种刀具材料的抗软化性。通过比较实验和理论产生的模具温度来估计接触热导。根据获得的这些数据，开发了五个帮助估计模具寿命的程序。它们是：1) 用于 4 节点和 8 节点四边形单元以及 8 节点六面体单元有限元分析的自动网格生成器。2) 解决锻模热传导问题的程序，其中包括模具软化状态的估计。3) 求解锻模热应力的程序。4) 估计模具和工件之间热导率的程序。5) 用于显示热导率的三维图形。锻模的几何形状以及温度、应变、应力、硬度等的分布。所有程序都在带有NDP8087的NEC-9801-VM2个人计算机上执行。