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前言为了解决精铸的(无)小余量叶片加工榫头部位问题,需采用精密定位方法。据了解国外有的发动机的一级涡轮空心叶片是使用低熔点塑料定位,二级实心叶片使用低熔点合金(镉、铋、铅等)定位。经我们试验,国产的一些熔融范围较低的塑料以及松香、虫胶等材料强度低,熔融时的流动性差,不能作为定位材料。低熔点合金(镉、铋、铅等)易引起叶片腐蚀损坏,而且有毒,不宜采用。后来发现含结晶水的一些结晶体(俗称矾的一类物质)既具有一定的强度,又有较低的熔点,可以作为定位材料。通过进一步筛选,最后确定采用单组份的化学纯硫酸铝钾KAl(SO_4)_2·12H_2O作为K5叶片精密定位材料。
Preface In order to solve the casting (no) small margin blade processing tenon parts, need to use precision positioning method. It is understood that some foreign engines have a hollow turbine blades using low melting plastic positioning, two solid blades using low melting point alloy (cadmium, bismuth, lead, etc.) positioning. After our test, some of the domestic low-melting plastic and rosin, shellac and other materials, low strength, poor melt flow, can not be used as a positioning material. Low melting point alloys (cadmium, bismuth, lead, etc.) can easily lead to blade erosion damage, and toxic, should not be used. Later found that some crystals containing water crystals (commonly known as alum a class of material) both have a certain intensity, but also a lower melting point, can be used as a positioning material. Through further screening, the chemical composition of pure KAl (SO 4) 2 · 12H 2 O was determined to be a K5 precision positioning material.