Deep hole
Machining is a kind of machining field dominated by cutting tools designed specifically for existing applications. Many different industries involve deep hole machining. Nowadays, the success in this field is usually based on mixed use standards and special tool components, which have the experience of designing special deep hole machining tools. These tools are equipped with long and high precision tool shank, and have support function and integrated reamer. Combined with the latest cutting edge groove and blade material, as well as efficient coolant and chip control, the required high quality can be obtained at the highest penetration rate and machining safety. (1)Key points of deep hole machining operation: the coaxiality of the centerline of spindle and tool guide sleeve, tool rod support sleeve and workpiece support sleeve should meet the requirements; the cutting fluid system should be smooth and normal; there should be no central hole on the workpiece's processing end surface, and the drilling on the inclined surface should be avoided; the chip shape should be kept normal and straight strip cutting should be avoided. Chips: High speed machining of through holes, when the drill is about to penetrate, should slow down or stop the machine to prevent damage to the drill. (2)Cutting fluid for deep hole machining: In the process of deep hole machining, a large amount of cutting heat will be generated, which is not easy to diffuse. It is necessary to provide sufficient cutting fluid to lubricate and cool cutting tools. Generally, 1:100 emulsifier or extreme pressure emulsifier is selected; when high machining accuracy and surface quality are needed or tough materials are processed, extreme pressure emulsifier or high concentration extreme pressure emulsifier are selected. The motion viscosity of cutting oil is usually 10-20 cm 2/s (40 ℃), and the flow rate of cutting fluid is 15-18 m/s when the machining diameter is small. Low cutting oil, high precision deep hole machining, can choose cutting oil ratio of 40% extreme pressure vulcanized oil + 40% kerosene + 20% chlorinated paraffin. (3)Cautions for the use of deep hole drills: A.The end face of the workpiece is perpendicular to the axis of the workpiece to ensure the reliability of the end face seal. B.Pre-drilling a shallow hole in the workpiece hole position before formal machining, which can play a guiding and centering role when drilling. C.In order to ensure the service life of the tool, it is better to use automatic tool-walking. D.In case of wear and tear of the guide elements in the injector and the support of the activity center, they should be replaced in time so as not to affect the drilling accuracy.
