Deep hole drilling methods, main steps using a deep hole drilling gun, operating specifications for deep hole drilling machines

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With the advent of the technological era, deep hole drilling is still widely used in many professions. Especially when it comes to deep hole drilling, if it continues to be carried out according to traditional methods, it is likely that little progress will be made. Deep hole drills are usually made of high-speed steel or cemented carbide, and the chip removal systems for each deep hole drill are designed based on its size. It has a professional orientation as well as a centering effect. The oscillations during cutting also vary for each type. As a new type of machining process that emerged after World War II, deep hole drilling plays an increasingly important role in the development of the national economy. It features high machining efficiency, easy replacement of cutting tools, long service life for the tool bodies, and low costs associated with tool consumption. Our deep hole drilling processes are divided into the following methods: 1. Solid drilling method, used for processing blank materials without holes. 2. The boring method is used to improve the accuracy of the hole and reduce the roughness of its inner and outer surfaces. 3. The material-saving drilling method involves using a hollow drill bit to drill, and a core rod can be removed after processing. Deep hole drilling tools employ different machining methods according to various requirements during processing, thereby improving accuracy through technological advancements and enhancing the quality of the products. Deep hole drills are classified into two types based on the chip removal method: external chip removal and internal chip removal. Drills with external chip removal include gun drills, deep-hole flat drills, and deep-hole twist drills; those with internal chip removal are divided into three types based on the processing system used: BTA deep-hole drills, ejector drills, and DF deep-hole drills. What are the main steps involved in using a deep hole drilling gun? A deep hole drilling gun is a drill bit designed specifically for drilling deep holes. In machining, holes with a ratio of hole depth to hole diameter greater than 6 are generally referred to as deep holes. During deep hole drilling, heat dissipation and chip removal are difficult, and due to the slender shape of the drill shaft, its rigidity is low, making it prone to bending and vibration. Usually, pressure cooling systems are relied on to address cooling and chip removal issues. The biggest feature of the deep-hole drilling gun is its use of a special drill bit, which not only serves as a guide during operation but also prevents high-pressure coolant from leaking. It is primarily composed of systems such as the bed, spindle box, chip collector, oil feeder, drill pipe box, workpiece holder, and drill pipe holder. So what is the first step in using a deep hole drilling gun? 1. First, drill a guide hole in the workpiece with a precision of +0.001 inch (0.0254 mm)/-0, at a depth equal to half the diameter of the drill bit; note that the diameter of this hole must not be smaller than the diameter of the drill bit. 2. Ensure that the drill bit is firmly locked in the clamping sleeve and securely connected to the spindle; at the same time, align the cutting center line. Connect the cutting coolant reservoir to the nozzle and attach it to the machine tool. 3. Insert the top of the drill bit into the guide sleeve or guide hole, but be careful not to let the top touch the bottom of the guide sleeve or guide hole. 4. Open the sliding or two-layer valves, adjust the atomized mixture to the appropriate condition, and select the right feed speed and rotation speed. Operating specifications for deep hole drilling machines: 1. The voltage instability of the power supply for deep hole drilling machines shall not exceed 5%; the voltage and frequency indicated on the motor rating plate of the machine must match those of the power supply. Otherwise, the motor must not be started. 2. Before starting the deep hole drilling machine, check whether the oil level in the lubricants for the slide table guides and the feed spindle is at the center of the oil gauge. If the oil level is below the lower limit, add oil until it reaches the middle of the oil gauge. 3. For lubricating oil, when drilling deep holes, only oils that meet the specifications outlined in the machine tool’s manual, or oils with chemical properties similar to those specified, may be used. 4. The cooling oil tank is designed as two separate sections, with only the level of the clean oil being allowed to be higher than that of the dirty oil, in order to prevent the dirty oil from entering the clean oil tank. The level of the cooling oil can be checked once a week through a control window located on the side of the dirty oil tank; it must remain above the mark indicated on the glass, to prevent the oil pump from drawing in air and thus losing its functionality. It is necessary to see the liquid level through the glass at the top; otherwise, it is difficult to ensure circulation. 5. When replacing the V-belt on the spindle with a new one, it is necessary to ensure an adequate tension to prevent the belt from sagging, overheating, or causing noise or vibration during operation; if any such issues are observed, the belt should be tightened again. After working for one hour, the belt should be tightened again to compensate for its initial stretching and slipping out of place. Every 40 hours of operation, check the tension of the belt and tighten it from the beginning. 6. Check whether the clamping cone is positioned appropriately; all parts to be clamped should make full contact, with no gaps. The spring supports the drill sleeve, and it is necessary to ensure that the drill sleeve is in contact with the workpiece, otherwise there is a risk of the drill bit breaking. 7. When replacing the drill sleeve or bit, before starting drilling, carefully check whether the gap between the replaced drill sleeve and its support, as well as between the bit and the drill sleeve, is appropriate. 8. During operation, the cooling equipment should be cleaned several times a day: turn off the pump, turn the handwheel to clean the oil filter (do this not while drilling), and open the drain valve to flush out the sediment. After cleaning up, press the “Cool Down Defect Removal” button. Get ready for filtering. Restore the oil level in the cleaning oil compartment to the operating oil level. To prevent the filtering elements and wipers from becoming clogged, which could damage the function of the filter. 9. The selection of parameters such as cutting parameters affects both the quality and efficiency of machining, as well as safe production. To select the cutting parameters, coolant pressure and flow rate, as well as the parameters related to the drilling diameter appropriately, it is necessary to use the three sets of graphical parameters provided in the machine tool manual. The feed rate for drilling should be as low as possible, below the parameters given by the curve. The lifespan of the cutting tool, the quality of drilling, and the working speed are determined through practical experience after completing a complete processing cycle, with improvements made accordingly. 10. When the drilling operation is malfunctioning or defects occur, press the “Quick Reset” button to interrupt drilling and perform a quick reset. Then the drill bit retracts from the hole. 11. The “Emergency Stop” button can be pressed only in critical situations involving a deep hole drilling machine to halt drilling. Pressing the “urgent interruption” button may cause the drill bit to get stuck or cracked. 12. When performing routine maintenance on the machine tool, such as replacing drills, belts, gears, or cleaning deep-hole drilling machines, ensure that the power switch of the machine tool is turned off and that the main control switch is set to the “0” position. 13. The repair and replacement of parts in the electrical system must be carried out by skilled and authorized personnel. 14. For the initial operations and those upon completion of work on a deep-hole drilling machine, it is necessary to follow the operating procedures specified in the machine’s manual. Korea DAEYANG Machinery Co., Ltd. specializes in the supply of deep hole drilling machines, Trochoweld drill bits and drilling accessories. Phone: 18930829701. Products include deep hole drills, deep hole drilling machines, drill bits, deep hole machining equipment, Trochoweld tools, deep hole drilling and boring machines, grinding machine repairs, CNC multi-axis/vane/triaxial/ring die/BTA deep hole drilling machines, drill sleeves, support sleeves, fixtures, drill bits, boring machines, honing machines, and more.