列管式换热器广泛地应用于化工、制盐、电力等部门。它是将换热管穿过钻孔的管板,折流板而固定于桶体内的。根据换热器换热面积的不同,管板和折流板的孔数少则几十个,多则上千个。这些孔分布于两块管板和折流板上,要求装管时均能顺利通过,孔的精度要求较高,是换热器制造中的一个关键环节。目前,通常采用的钻孔方法是将管板和折流板重叠在一起,进行整体钻孔,但是用这种方法加工孔费时费力、精度得不到保证,固定板与管子之间不能紧密配 Tubular heat exchangers are widely used in chemical, salt, electricity and other departments. It is the heat transfer tube through the drilling tube plate, baffle and fixed in the barrel. Heat exchangers according to the different heat exchange area, the number of tubes and baffles of the hole less than dozens, as many as thousands. These holes are distributed on two tube plates and baffles, which can pass smoothly when the tubes are required to be installed, and the precision of the holes is high, which is a key link in the manufacture of heat exchangers. At present, the commonly used drilling method is that the tube plate and the baffle are overlapped to be drilled integrally, but the holes are difficult and time-consuming to be processed by this method, and the fixing plate and the tube can not be closely matched