The Twist Drill Bit is a commonly used drilling tool with simple structure. Grinding the drill edge is very important for workpiece processing, but it is not easy to grind it properly. The key lies in mastering the methods and techniques of blade grinding. With the mastery of these methods and the experience of multiple blade grinding, one can effectively grasp the grinding scale of the drill bit. First, before drilling, first place the main cutting edge of the Easy Twist Drill Bit Tool on a horizontal plane with the grinding wheel surface, which means that when the blade contacts the grinding wheel surface, the entire blade must be ground. This is the first step in the relative position between the drill bit and the grinding wheel. Once the position is set, slowly lean against the grinding wheel surface. Second, if the angle is not correct, the sharp angle of the High Speed Steel Twist Drill Bits will directly affect the size of the top angle, the shape of the main cutting edge, and the oblique angle of the transverse edge. It refers to the positional relationship between the axis of the drill bit and the surface of the grinding wheel, which can be seen accurately at an angle of 60 °. Here, it is important to pay attention to the relative horizontal and angular positions of the drill bit before grinding. Both should be considered comprehensively, and do not neglect to adjust the angle or adjust the blade to adjust the angle.
Third, after the cutting edge contacts the grinding wheel, it should be ground from the main cutting edge to the back face, that is, starting from the cutting edge of Precision Twist Drill Bits to contact the grinding wheel first, and then slowly grinding down the entire back face. When the drill bit is cut in, it can gently touch the grinding wheel. First, perform a small amount of edge grinding, and pay attention to the uniformity of the spark. Adjust the pressure on the hand in a timely manner, and also pay attention to the cooling of the drill bit. Do not let it grind too much, causing discoloration of the edge, and even annealing of the edge. When the temperature of the cutting edge is found to be high, the drill bit should be cooled in a timely manner. Fourth, this is a standard drill bit grinding action, where the main cutting edge swings up and down on the grinding wheel, meaning that the hand holding the front of the drill bit should evenly swing the drill bit up and down on the grinding wheel surface. The hand holding the handle cannot swing, and it is also necessary to prevent the rear handle from tilting upwards, that is, the tail of the drill bit cannot be raised above the horizontal centerline of the grinding wheel, otherwise it will make the cutting edge blunt and unable to cut. This is the most crucial step, and whether the drill bit is ground well or not is closely related to it. When the grinding is almost done, start from the edge of the blade and gently rub against the back corner to make the back of the blade smoother. Fifth, after grinding one edge, grind the other edge, ensuring that the edge is in the middle of the drill axis and the edges on both sides are symmetrical. Experienced masters will observe the symmetry of the drill tip in front of the bright light and slowly polish it. The back angle of the cutting edge of the drill is generally 10 °~14 °. The back angle is too large, the cutting edge is too thin, and the vibration is severe during drilling. The orifice is triangular or Pentagon, and the chips are needle shaped; The back angle is small, and the axial force during drilling is large, making it difficult to cut in. The cutting force increases, resulting in a large temperature rise and severe heating of the drill bit, making it even impossible to drill. The back angle grinding is suitable, with the sharp point centered and the two edges symmetrical. During drilling, the drill bit removes chips quickly and without vibration, and the aperture will not expand.
Sixth, after grinding the two edges, pay attention to sharpening the tip of the drill bit for larger diameters. After grinding the two edges of the drill bit, there will be a plane at the tip of the two edges, which affects the center positioning of the drill bit. It is necessary to chamfer the angle behind the edge and grind the plane of the tip as small as possible. The method is to erect the drill bit, align it with the angle of the grinding wheel, and at the root behind the blade, pour a small groove towards the blade tip. This is also an important point for the centering of the drill bit and the ease of cutting. Be careful not to grind the chamfer of the cutting edge onto the main cutting edge, as this will cause the front angle of the main cutting edge to be too large and directly affect the drilling process.
There is no fixed method for grinding drill bits, and it is necessary to accumulate experience in practical operation, compare, observe, repeatedly test and explore, and add some intuition to better grind the drill bit.
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