The continuous development of science and technology has driven the progress of all walks of life. In terms of machinery, the deep hole drills produced are widely used. In deep hole processing, deep hole drilling machine is an essential mechanical product. What are the characteristics of deep hole drilling machine?

1. Limited by the hole diameter, the cutter bar has small diameter and large length, resulting in poor rigidity and low strength. It is easy to generate vibration, ripple and taper during cutting, which will affect the straightness and surface roughness of deep holes.

2. When drilling and reaming, it is difficult to input the cooling lubricant into the cutting area without using special devices, which reduces the tool durability and makes chip removal difficult.

3. In the process of deep hole processing, it is not allowed to directly observe the cutting condition of the tool, but only to judge whether the cutting process is normal by working experience to listen to the sound of cutting, look at the chips, touch the vibration and workpiece temperature, and watch the instrument (oil pressure gauge and electric meter).

4. It is difficult to remove chips. Reliable means must be used to break chips and control the length and shape of chips to facilitate smooth removal and prevent chip blockage.

5. In order to ensure the smooth processing of deep holes and meet the required processing quality, the internal (external) chip removal device, tool guide and support device and high-pressure cooling and lubrication device should be added.

Generally, a hole with a depth of more than 3-5 times of the hole diameter is called a deep hole. Its difficulty lies in the fact that fried dough twist drills can be used to remove chips and cool holes with a relatively small hole depth. In order to remove chips smoothly, iron chips should be channeled straight out in thin strips and bring out smaller chips. At the same time, coolant is easy to enter. A relatively simple grinding method can be used to grind drill bits.

1. The included angle of the drilling edge is increased to 130-140 degrees to increase the chip thickness and change the direction of chip discharge (the direction of chip discharge is perpendicular to the edge)

2. Grind the horizontal edge to reduce the axial cutting tool, and at the same time, the cutting edge will produce a corner near the drill core to facilitate chip separation.

3. If the drilling diameter is large, the chip separating groove can be grinded on one side of the cutting edge, which should be wider to balance the cutting force of the two cutting edges. If the diameter is large, the chip separating groove can be grinded on the two cutting edges.

4. Make an angle of 1mm and 45 degrees at the outer corner of the cutting edge to reduce wear and improve the finish.

5. The drilling speed is slightly lower, and the feed rate should be larger, so that the chips are thickened and discharged in strips.

6. The coolant nozzle of the deep hole drill shall face the hole inwards to facilitate the coolant entering the cutting area,

When the hole diameter ratio is more than 8 times larger than the batch size, it should be drilled on a special deep hole drilling machine, which is very effective. I have tried to produce 45 # steel with lathe spindle diameter of 32 and length of about 850mm in only 13 minutes.