The flat drill is the simplest hole machining tool. Our factory is solving the blockage of the cylinder casting tube; the hard alloy deep hole flat drill made of the flat drill structure has good performance and obtains remarkable processing effect. Due to the inlaid casting method, the pipeline is cast into the cylinder, the pipe joints are many, the welding process is complicated, and due to the welding quality problem of the cast pipe, the molten iron penetrates into the pipe during casting, and the core sand is condensed together to cause the pipe to be blocked. Need to process drilling.