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一般鉄砂鑽头水口高度经过磨损低于80公厘时即不宜再用,必須要修理。过去我們修理时,多採用铜锯来鋸和氧气来烧割,这两种办法,不但在费用上不经济,且切出的水口往往不大标准,不能成为弧形。經我們研究改用鍛工燒切水口的方法后,經过两年多的实踐,效果尚好,对鑽头質量无影响,切出的水口也都达到規定标准,滿足了生产上的要求。现半情況介紹如下。工具和设备:(乃木刂)鉄砂鑽头水口用的工具,设备和制作都很簡单,人民公社里的铁业组(打鉄或机场里有人懂得紅爐性能者,便能制作使用。主要用的工具有:
Generally, the height of the nozzle of the boring bit is less than 80 mm. It should not be reused and must be repaired. In the past, we used copper saws and oxygen to burn and cut. These two methods are not only uneconomical in terms of cost, but also the cut-out nozzles are often not large enough to be curved. After we studied the method of changing the forging and cutting nozzles, after more than two years of practice, the effect was still good, and there was no effect on the quality of the drills. The cut-out nozzles also reached the required standards and met the production requirements. The current situation is described as follows. Tool and equipment: The tool, equipment and production for the nozzle of the sand boring bit are simple. The iron group in the people’s commune (the snoring or someone in the airport who understands the performance of the red kiln) can use it. The main tools used are: