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在用于透烧的感应加热线圈中,都要装有耐火衬管,目的是将工件与线圈隔开,起到绝缘、绝热的作用。以往的衬管,大多是由耐火陶瓷材料烧结制成,使用时要在外面包上耐火绝热材料(多采用石棉布)。这种衬管有两个缺点:一是质脆,强度低,因而寿命短。特别在加热长工件时,往往难于保证直度,损坏量更大。如在锻造、热处理感应加热抽油杆时,杆长7～8m,稍有弯曲,就会将衬管撞坏。二是径粗(即管壁厚),使得工件与线圈的间隙较大,影响电效率。按某些资料介绍的方法,采用
In the induction heating coil for firing through, are equipped with a refractory lining pipe, the purpose is to separate the workpiece and the coil, play the role of insulation, thermal insulation. Previous liner, mostly made of sintered refractory ceramic material, the use of fire-resistant insulation materials to be wrapped in the outside (more use of asbestos cloth). This liner has two disadvantages: First, crisp, low strength, and thus short life. Especially in the heating of long workpieces, it is often difficult to ensure straightness, the greater the amount of damage. As in the forging, heat treatment induction heating rod, the rod length 7 ~ 8m, a slight bend, it will crash the liner. The second is coarse diameter (ie, wall thickness), making the gap between the workpiece and the coil larger, affecting the electrical efficiency. According to some information on the introduction of the method used