What Are the Points of Attention of Deep Hole Drills When Drilling?

1. Deep hole machining is in a closed or semi-closed state, so it is not possible to directly observe the cutting of the tool.

2. Cutting heat is not easy to spread. In the general cutting process, 80% of the cutting heat is taken away by chips, and deep hole drilling is only 40%, the proportion of cutting heat is larger, diffusion is late, easy to overheat, the knife temperature can reach 600 degrees, must take a mandatory and effective cooling method.

3. Chips are not easily discharged. Due to the deep hole, the route through which the chips pass is long, which is prone to blockages, causing the drill to collapse. Therefore, the length and shape of the chips are controlled and mandatory chip removal is carried out.

4. The rigidity of the process system is poor. Due to the size of the aperture, the long diameter of the hole is relatively large, the drill pipe is thin and long, the rigidity is poor, easy to produce vibration, drilling is easy to go, so the support guide is extremely important.

In order to guide the drill into the drill correctly, the method of machining the guide hole on the workpiece or using the guide sleeve is used, the former is used for single-piece machining and the latter is used for mass production. The deep hole drilling error is caused by the gap between the drill bit and the guide sleeve (guide hole), and increases with the increase of axial force. The effect of the gap between the guide sleeve and the drill bit on the drill error. At the beginning of drilling, radial force will guide the drill bit guide block pressure to the guide sleeve hole wall, because there is a gap between the two, the center of the drill bit relative to the workpiece swing center offset, when the drillout aperture is less than the drill bit diameter. When the guide block starts to enter the processed hole, under the action of the slightly smaller hole wall in diameter, the outer edge is squeezed outward, so that the center of the drill bit is offset in the opposite direction of the workpiece swing center, so that the aperture expands, and the guide hole wall squeezes friction, so that the drilling torque increases rapidly.