Analysis of Deep Hole Bit Grinding Method
Deep-hole drills are divided into welded deep-hole drills and additive deep-hole drills. Deep-hole drills use internal chip removal. The blades of welded deep-hole drills can not be exchanged. The blades of machine-deepened deep-hole drills are interchangeable. The body of machine-deepened deep-hole drills can be used permanently and the blades can be replaced. Let's talk about the grinding method of deep hole drilling gun and drill tool.
1. The edge should be flattened with the grinding wheel surface.
Before grinding a deep hole drill, the main cutting edge of the deep hole drill and the grinding wheel surface should be placed on a horizontal plane, that is, when the edge contacts the grinding wheel surface, the whole edge should be grinded.
2. Deep-hole drill bit axis should be inclined 60 degrees from grinding wheel surface.
This angle is the front angle of the drill. The wrong angle at this time will directly affect the size of the top angle of the deep hole drill, the shape of the main cutting edge and the angle of the cross edge. This refers to the position relationship between the axis line of the bit and the surface of the grinding wheel. Take 60 degrees, and this angle is generally more accurate. Here we should pay attention to the relative horizontal position and angle position of drill before grinding. Both of them should be considered as a whole. We should not neglect the setting angle for the sake of flattening the edge or the flattening edge for the sake of flattening the edge.
3. Grinding back from the edge of deep hole drill bit
When the cutting edge touches the grinding wheel, it should be grinded backward from the main cutting edge, that is, the grinding wheel should be touched first from the cutting edge of the drill bit, and then grinded slowly down along the whole flank of the rear cutter. When deep hole drills are cut in, they can touch the grinding wheel lightly, grind a little bit first, observe the spark uniformity, adjust the pressure on hand in time, and pay attention to the cooling of the drills, so that they can not be grinded over-heat, causing discoloration of the edge and annealing of the edge. When it is found that the cutting edge temperature is high, the drill bit should be cooled in time.
4. The edge of deep hole drill should swing up and down, and the tail of the drill should not be warped.
This is a standard drill grinding action. The main cutting edge swings up and down on the grinding wheel, that is, the hand holding the front of the drill.