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前言我厂生产的铜管乐器,就是各种不同尺寸的圆柱形、锥形薄壁铜管弯曲件加上活塞、“扬声器”的制作。铜管弯制是管乐器制作的一项重要工艺,以往加工弯管一般先在管内灌满填充材料——铅,然后用手板模或在弯管机上扳弯成各种弯曲半径的制件,再修整作圆、脱铅、锉圆、砂光,往返工序达30多道,均系繁重的手工操作。这样加工成的弯管制件质量低劣,外壁由于扳弯力的不匀,弯曲伸缩易破裂;内壁由于应力集中,件件有皱疤。
Preface I plant brass instruments, is a variety of different sizes of cylindrical, conical thin-walled copper tube bending with piston, “speaker” production. Brass pipe bending is an important process of making wind instruments. In the past, pipe bending pipes were usually filled with filler material, lead, and then bent into a variety of bending radius parts by hand plate bending or bending machine Trimming for the round, lead-free, filing round, sanding, from the process up to more than 30 Road, are heavy manual operation. This processed into the poor quality of the elbow parts, the outer wall due to uneven bending force, flexural expansion easy to crack; wall due to stress concentration, pieces of a scar.