This allows manufacturers to achieve their manufacturing tolerances and production requirements reliably, accurately, and efficiently.ĭeep hole drilling is generally performed on dedicated deep hole drilling machines which are manufactured and assembled to optimize the processes for straightness and efficiency. Advances in technology allow CNC machining centers, equipped with high pressure, through-spindle coolant, to be capable of gundrilling up to a limited depth-to-diameter ratio. Deep hole drilling is used in a variety of materials from aluminum to super-alloys, and is capable of achieving tight diameter control, straightness, and superior surface finish into workpieces.ĭeep hole drilling processes work by using special tools and setups to deliver high pressure coolant, evacuate chips cleanly, and achieve depth-to-diameter holes into metal beyond what a common CNC machine can reach. Deep hole drilling into metal has a range of applications across several industries, with its origins tracing back to the need for straighter, more accurate gun barrels, and expanding as other industries integrated deep hole drilling processes to improve their own applications.ĭeep hole drilling consists of BTA drilling and gun drilling, with additional processes designed for specific tolerance objectives and generally performed on BTA-style deep hole drilling machines. Cutting speed and feed speed have a great influence on machining quality, and the cutting fluid pressure mainly affects the surface roughness.A deep hole is defined by its depth-to-diameter ratio (D:d), and typically holes greater than 10:1 are considered deep holes. The shape and position accuracy of the entrance end is higher than that of the exit end, but the surface quality is the opposite. The results show that the cutting force decreases with the increase of cutting speed, and increases with the increase of feed speed the error between the theoretical and actual value is less than 10%. A numerical model of cutting force is established based on the mechanism of gun drill, and then the finite element simulation and processing test are carried out. In this paper, 42CrMo high strength steel is selected as the workpiece material. JO - International Journal of Precision Engineering and ManufacturingĪB - There are a lot of problems in the processing of deep hole gun drilling of high strength steel, such as difficulty in selecting machining parameters, unknown influence mechanism of machining parameters on drilling force, drilling temperature and machining quality. T2 - International Journal of Precision Engineering and Manufacturing TI - Research on Deep-Hole Drilling of High-Strength Steel Using Slender Gun Dril
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