目前国内外生产的钢琴中,弦轴板不少是由5层厚度相同的色木板,纹理垂直交叉粘合的;因最上层和最下层受力最大,纹理与受力方向一致。这种结构的弦轴板,应该说设计是比较合理的。然而,由于木材本身存在着不均匀性,有的还存在病态缺陷,因此在我们的钢琴维修工作中,仍然时常会遇到一些弦轴松动、音律调不上去的情况。卸下弦轴后,则会看到这些轴孔不同程度地发生变形(被压扁),孔壁(扁圆的长轴方向)上出现细小的裂纹。为此,我们设想一种由不等厚的色木板合成的弦轴板,并相信它在音准稳定性方面优于上述弦轴板。 At present, piano produced at home and abroad, a lot of chord plate by the thickness of the same five layers of wood, vertical cross-bonded texture; the uppermost and the lower most stress, texture and stress the same direction. This structure of the chord plate, it should be said that the design is more reasonable. However, due to the inherent inhomogeneity of the wood itself and the existence of morbid defects, it is still often encountered in our piano repair work where the strings are loose and the temperament can not be adjusted. After removing the pegs, you will see these pegs deform to some extent (crushed) and small cracks appear in the hole walls (oblate long axis). For this reason, we envisaged a chord plate made of wood of unequal thickness and believed that it is superior to the above-mentioned chord plate in pitch stability.