热膨胀误差对飞行器装配中互换协调的影响及其排除方法

论述了飞行器装配中产生的两种热膨胀误差是影响其互换、协调性的主要因素 ,并提出了排除其影响的简单。

人造富矿软化区间的测定装置

本文针对在进行人造富矿高温荷重软化性能测定中的高温膨胀误差问题,提出了自动补偿的方法,从而能较准确地测定出矿样软化收缩量的实际数值,并能通过xy记录仪自动画出收缩率与温度函数曲线。本装置除用于钢铁冶金外,也适用于耐火材料工业等部门,测量各种材料的高温荷重软化性能,测量精度为0.5%。

Improvement of machining quality of copper-plated roll mold by controlling temperature variation

Micro prism film used in LCD industry can be manufactured by roll to roll method with copper-plated roll mold. As copper-plated roll mold is getting larger, pitch error is getting severer. The pitch error drops the quality of micro prism film. The main cause of the pitch error was investigated during machining large roll mold whose machined length was 1 200 mm. The temperature of machining system was elevated during machining roll mold, and this elevation induced thermal expansion of the system. The temperature variation around the roll mold also made thermal expansion of the roll mold. The amount of thermal expansion had strong relationship to the amount of pitch error. Therefore, the roll mold was machined after warming-up of machining system and precise temperature controller around copper-plated roll mold was installed, which minimized the temperature variation. Finally, precise micro prism patterns without pitch error were machined on the large roll mold.

飞机装配互换协调性影响因素分析

分析表明，飞机装配过程中产生的两类热膨胀误差是严重影响飞机装配互换、协调性的主要客观原因。而我国过去生产的机种结构设计不够合理，对各协调尺寸在形成过程中可能产生的累积误差缺乏分析估算，对其工件对接、配合结构缺少足够的调整补偿量，以致协调准确度要求过高，则是主观上的主要原因。同时分析了欧美各国消除热膨胀误差对飞机互换、协调影响综合解决办法的效果。