成形工具转动数控渐进成形中摩擦热引起板料局部温度升高特性研究

项目名称： 成形工具转动数控渐进成形中摩擦热引起板料局部温度升高特性研究

项目编号： No.51205217

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 机械工程学科

项目作者： 王进

作者单位： 青岛理工大学

项目金额： 25万元

中文摘要： 成形工具转动数控渐进成形中，工具与板料间接触摩擦热可能会引起板料局部温度显著升高。合理利用这种特性有望实现多种镁合金和铝合金难加工轻金属材料在无需外加热源条件下进行温/热渐进成形。影响摩擦热引起板料局部温度升高的工艺参数众多，系统的研究尚未见报道。本项目拟对成形工具转动渐进成形中摩擦热引起板料局部温度升高特性展开实验和理论研究。借助正交试验设计，通过系统实验分析确定各工艺参数对板料局部温度升高的影响规律和影响程度；在此基础上，通过简化和假设，解析计算球头和平头两类工具成形时板料局部表面吸收的摩擦热，将摩擦热引起板料局部温度升高问题简化为有限厚度板第二类边界条件作用的二维瞬时热传导问题，通过求解热传导方程建立定量描述板料局部温度升高的解析数学模型，以实验和三维接触热-力耦合有限单元法数值模拟结果校验和修正该数学模型。以期为板料数控渐进成形中合理利用摩擦热奠定基础。

中文关键词： 工具转动渐进成形；摩擦热；温度升高；工艺参数；传热模型

英文摘要： The temperature rise of local sheet caused by the friction heat between forming tool and sheet may be noteworthy in rotational incremental forming. Difficult-to-form lightweight metal such as aluminium alloy and magnesium alloy can be formed in warm or hot inremental forming by using the fricition heat as heat source. There are many technical parameters affecting the temperature rise of local sheet that have not been sutdied in detail. This project will investigate the temperature rise of local sheet caused by the fricition heat in rotational incremental forming by using a series of experiments and theoretical model derivation. Based on orthogonal test design, the law and level that each technical parameter influences the temperature rise of local sheet will be obtained by experiments in detail. After computing the absorbed heat by local sheet in rotational incremental forming using two kinds of tools with flat end and hemispherical end, the temperature rise of local sheet will be simplified as a two dimension heat conduction problem of a finite thickness plate with the second type boundary condition. A mathematical model for computing the temperature rise of local sheet will be established by solving the heat conduction equation based on simplification and hypothesis. The model will be verified and revised by t

英文关键词： rotational incremental sheet forming；friction heat；temperature rise；forming parameter；heat transfer model