christopherseiler

Original title: Dry goods, the relationship between geometric angle of twist drill and sharpening accuracy Source: Mechanical Professor Geometric angle of twist drill: 1. Vertex angle 2 Φ It is the angle between the projections of the two main cutting edges in the midplane. The smaller the vertex angle is, the longer the main cutting edge is, the load on the unit cutting edge is reduce main cutting edge of a twist drill is the angle between the projection of the main cutting edge on the base plane of the point and the drilling feed direction. Due to the different base planes of each point on the main cutting edge of the twist drill, the main deflection angle of each point also changes accordingly. After the twist drill is ground to a vertex angle of 2Φ, the main cutting angle of each point is determined, DHD Drill bit , and the relationship between them is tan = tanΦcos (2-2). The end face cutting edge inclination angle of the selected point is the included angle between the projection of the main cutting edge in the end face and the base surface of the point. Expand the full text Because the absolute value of the edge inclination angle of each point on the cutting edge gradually increases from the outer edge to the drill center, the main deflection angle of each point on the cutting edge is also large at the outer edge and small at the drill center. 5. Angle of chisel edge The chisel edge is a section of cutting edge perpendicular to the axis on the end face of the twist drill, andwhich is easy for students to master. Pithy formula 1 and pithy formula 2 both refer to the relative position of the drill bit before sharpening. The two should be considered as a whole. Do not neglect to set the bevel angle in order to level the cutting edge, or neglect to level the cutting edge in order to set the oblique axis. These mistakes are often made in actual use. The drill bit is now in the correct position and ready to contact the grinding wheel. Pithy formula 3: "Grind the back from the blade to the back." This refers to the slow sharpening from the cutting edge of the drill bit along the entire back. This facilitates heat dissipation and sharpening. On the basis of stabilizing and consolidating the first and second pithy formulas, the drill bit can gently contact the grinding wheel at this time for a small amount of sharpening. When sharpening, observe the uniformity of sparks, adjust the pressure in time, and pay attention to the cooling of the drill bit. When you start sharpening again after cooling, you should continue to set the position of the first and second pithy formulas, which is often difficult to grasp at the beginning of learning, and often change the correctness of its position involuntarily. Pithy formula 4: "Swing up and down and don't warp your tail." This action is also very important in the process of drill sharpening. Some students often change "swinging up and down" into "rotating up and down" when sharpening,dhd drill bit, which destroys the other main edge of the drill. At the same time, the tail of the drill bit should not be higher than the horizontal center line of the grinding wheel, otherwise the cutting edge will be blunt and can not be cut. Return to Sohu to see more Responsible Editor:. wt-dthtools.com