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Introduction to Deep Hole Processing : Deep-hole machining (hole depth to hole diameter ratio > 5) has a very important position in machining field, accounting for over 40% of the machined hole amount. As science and technology develop, high-strength, high-hardness, high -value and harder-to-machine new deep-hole parts emerge successively; requirements for machining depth, precision and efficiency are promoted continuously for work pieces, making deep-hole machining the key process and difficult point in machining process. For process system rigidity, chip removal, cooling and lubrication issues, it’s harder and harder for to fulfill the requirements for precision, efficiency, and material in deep-hole machining or even cannot meet the requirements by traditional machining method. Therefore, a specific drilling technique is needed for supporting such deep-hole machining.
Definition of Deep Hole : Deep hole processing falls into deep hole and shallow hole types: The generally specified ratio of hole depth L to hole diameter d is greater than 5, namely hole L/d ﹥5 deep hole; hole L/d ﹤5 is shallow hole and that L/d ﹥100 super deep hole.
Deep Hole Drilling : A number of machine tool installation methods can be adopted for deep-hole drilling: work piece rotating with cutter feeding movement; fixed work piece with cutter rotating and feeding; work piece rotating with cutter reverse rotating and feeding. The specific installation method depends on work piece characteristics and the hole to be machined.
