RB/SPF of Superplastic Aluminum Alloy Sheets by GAS GENERANTS

气体发生器超塑性铝合金板的 RB/SPF

基本信息

批准号：
10650717
负责人：
OSAWA Hiroaki
金额：
$ 1.66万
依托单位：
Hosei University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650717/
关键词：
Gass Generant Superplasticity Aluminum Alloy RB SPF Truss Structure ハニカム構造

项目摘要

Superplastic forming of aluminum alloy sheets was tentatively carried out, in which instead of using inert gas or air gas blowing, dilational work of inert gas during increasing temperature is utilized. Inert gas can be obtained by thermal decomposition of some chemical substances, so called GAS GENERANTS. Conventional forming apparatus for superplastic blow forming may be simplified and therefore cost down by applying this idea actually. Improvement of working conditions are also brought about at the same time. SuperPlastic Forming/Diffusion Bonding (SPF/DB) is known as a very effective way of forming, especially in USA for making hollow structural components of air plane's body structure. Feasibility of actual forming of superplastic aluminum alloy sheets by using GAS GENERANT and of making hollow structural component such as truss structure by not DB but Roll Bonding (Roll Bonding) were explored.Detailed experimental examination reveals that some problems that must be solved would be occurred ;1. Selection of materials of STOP OFF added GAS GENERANT and best volume fraction of each drug.2. Pressure in the formed sheet during cooling down happens to go down to very low value, less than atmospheric pressure. In this case, if the thickness of formed part is very thin, a kind of buckling would be occfurred. The problem is how to protect this.3. Bonding strength between two sheets after roll bonding must be maintained high enough.4. Precise rolling process is also needed for avoiding the distortions of pattern printed.Warm rolling machine was newly introduced for examining and solving these items and the optimum combination of skin and core materials was selected in the beginning. Surface treatment before roll bonding was improved as well. Finally formed components through this process that seems to be suitable actual use were obtained successfully.

尝试进行铝合金板的超塑性成形，其中不使用惰性气体或空气吹气，而是利用惰性气体在升温过程中的膨胀功。某些化学物质热分解可得到惰性气体，故称为气体发生器。通过实际应用这一想法，可以简化用于超塑性吹塑成型的传统成型设备，从而降低成本。同时也带来了工作条件的改善。超塑成型/扩散粘合（SPF/DB）被认为是一种非常有效的成型方法，特别是在美国用于制造飞机机身结构的中空结构部件。探讨了使用气体发生剂实际成形超塑性铝合金板材以及不采用DB而是采用滚压接合（Roll Bonding）制造桁架结构等空心结构部件的可行性。详细的实验检验表明，会出现一些必须解决的问题;1. STOP OFF添加气体发生剂的材料选择及各药物的最佳体积分数。 2．在冷却过程中，成形片材中的压力恰好降至非常低的值，小于大气压。在这种情况下，如果成型件的厚度很薄，就会出现一种屈曲。问题是如何保护this.3。滚压后两片材之间的粘合强度必须保持足够高。4．为了避免印刷图案的变形，还需要精确的滚压工艺。为了检查和解决这些问题，新引进了温滚压机，并从一开始就选择了皮芯材料的最佳组合。辊压粘合前的表面处理也得到了改进。最终通过这个过程成功获得了看起来适合实际使用的成型组件。