钢琴弦轴折断后,通常是将折断滞留部分以强力砸进弦轴板枕木中。显而易见,这对枕木强度及其他弦轴与轴孔的有效配合会产生不良影响。金伟同志采用的在弦轴中心钻孔,引起发热膨胀使钻头咬住弦轴的拔出方法,也存在两个缺点:一是强力钻削时易导致钻头折断;二是仅靠钻头与轴的摩擦力,有时难以拔出配合很牢固的断轴。 After the break of the piano string shaft, the broken part of the stay is usually smashed into the sleeper of the chord plate by force. Obviously, this has an adverse effect on the strength of the sleepers and on the effective cooperation of other pegs and shaft holes. Comrade Jin Wei used to drill in the center of the string axis, causing the thermal expansion of the drill bit to bite the string axis pull-out method, there are two disadvantages: First, strong drilling easily lead to the drill broken; second only by bit and shaft The friction, it is sometimes difficult to pull out with a strong broken shaft.