Machine clip-deep hole drilled flat blades and knives body composition, there are two structural types, namely quick change and indexable type.
　　Quick change on the support surface is flat diamond cutter milled notch, and the match ends flat drill groove, with screws, simple structure, easy accessibility, reliable, it is currently one of the most widely used structure. Quick flat diamond blade made of high-speed steel or carbide. Currently indexable drill flat range of φ19-φ88mm, both ends of the blades are formed with a cutting edge, end wear, for the other side to use. When clamping, the use of blade center hole positioning. In the drill on both sides of the system out of the bottom corner after the match with the blade support surface, behind the bottom there is a small groove width of 2mm, forcing time slot with screws knife blade deformation and pinch the blade. Indexable insert drill flat shape. Modified blade geometry. Points flutes and quick-change blade the same, but the cutting edge blade parallel to the base surface, no blade angle. The blades vice posterior horn αo = 0o, using cylindrical surface to enhance orientation. Blade material of high cobalt high speed steel, or titanium nitride coating blades, knives high durability.
　　Carbide drilling machine clip flat higher speeds and productivity. The general scope of the use of φ20-φ65mm. This structure is drilled flat blades, drill support blocks and components. As a result of the support block, drill pipe manufacturing simplicity, technology is good. The rear end of the boss and the blade bearing blocks match together into the drill slot with screws. Blade replacement is simple and convenient.
　　For larger aperture (d0> 100mm) deep hole machining, can use another fabricated flat carbide drill. The main structure of the drill blade after the top wire. Blade, wedge. Positioning sliding pin, twist drill, the cutter body and the knife body and other components, which consist of upper and lower cutter knife specific body, clamping and positioning of the blades from the action. Cutting portion is a combination of the two tools together, the central part of the installation of an ordinary twist drill, centering mainly from the drilling and completion of part of the work. Interchangeable with standard carbide blade inserts, drilling and completion of major work, after the blade wear, can be adjusted through the top wire and wedge blades protruding amount of the blade resharpening.
　　This assembly Carbide flat drills have the following characteristics:
　　(1) As a result of carbide inserts, thus allowing for higher speed cutting and high productivity.
　　(2) Since the center drill to begin cutting, so-centering effect, and can reduce the blade to bear axial force, improve the working conditions of the blade.
　　(3) the use of the wrong tooth blade arranged to ensure reliable points crumbs, small chips easily formed, Chip smooth, while the radial force on the cutting edge can be obtained more reasonable balance, heat better conditions.
　　(4) to neutral good, because the two main cutting edge from radial plane, the cutting is formed with the center drill not in the same plane of a three-dimensional conical surface of three point circle structure to ensure a neutral tool.
　　In addition to the straight groove in the form of drill pipe, there is a spiral groove in the form of drill pipe. Drill pipe and drill pipe with pipe guide blocks, which are mainly used in the form of drill length to diameter ratio (L / d0) large deep processing.
　　When the flat by drilling holes, using external chip form, but by the drill cuttings interference, difficult to drain freely. Therefore, in the vertical drilling machine use flat, even through the coolant, can only process a shallow hole. For horizontal machining, drilling depth increases, the pressure of the cooling fluid should also be increased accordingly, while also grind breaker sets, curling the chips break into the chip in the form of easy-to-discharged.