CNC Knowledge: Introduction to “Deep Hole Drill”

Treatment characteristics of the drill with deep holes:
1. The tool rod is limited by the opening diameter, with a small diameter and a long length, resulting in poor rigidity and low resistance. deep hole.
2. When drilling and bore holes, it is difficult to enter the coolant in the cutting area without special devices, which reduces the sustainability of the tool and is also difficult to remove the fleas.

3. During the treatment of deep holes, you cannot directly observe the cut of the tool. A counter (is oil pressure and electricity meter) Is the cutting process normal?
4. To eliminate fleas, reliable means must be used to cut the chips and control the length and shape of the chips to facilitate smooth withdrawal and prevent the clogging of fleas.
5. In order to ensure that the deep holes are carried out smoothly during the processing process and respect the required treatment quality, the chip withdrawal (outside) of the tool, the guidance device and tool support and high pressure cooling and the lubrication device must be added.
Generally, the depth of the hole is more than 5 times the diameter of the hole, which is called deep hole. Elimination of smooth fleas, iron shavings must become thin stripes and run straight.
The forest grinding method can be used with a relatively simple grinding method:
1. The angle of the drilling blade is increased to 130-140 degrees to increase the thickness of the chip and change the direction of the discharge of the chip (the direction of the discharge of the chip is perpendicular to the blade)
2. Croving the horizontal blade to reduce the axial cutting tool and at the same time, the cutting edge produces an angle of fold near the drilling core to facilitate the separation of the fleas.
4. Insert 1 mm and 45 degrees at the exterior corner of the blade to reduce wear and improve the finish.
5. The drilling speed is slightly lower and the input volume must be greater, so that the chips are thicker and unloaded in strips.
6. The coolant nozzle should be inwards to the hole and the coolant enters the cutting area.
Questions and solutions frequently asked modify
The surface of the hole is rough
1. Flea bondage: Reduce the cutting speed; avoid cracks;
2. Bad coaxiality: Adjust the coaxiality between the machine-tool pin and the drilling sleeve; Use an appropriate drill sleeve diameter.
3. The cutting speed is too low, the quantity of power is too large or uneven: use the appropriate quantity of cut.
4. The geometry of the tool is inappropriate: modify the geometric angle of the point and the shape of the guide block
The orifice is in the shape of a horn
Bad coaxiality: Adjust the coaxiality of the pin-tool, the drilling sleeve and the support sleeve; Use the appropriate handle diameter to replace the drilling sleeve with excessive wear over time.

Break Drill Bit
1. The breaking of the chip is not good and the chip cannot be deposited: modify the size of the circuit breaker to avoid being too long or too shallow; fluid; Use parts with a uniform material structure.
2. The quantity of power is too large, too small or unequal: use the appropriate quantity of cut.
3. Excessive wear of the forest: regularly replace the forest to avoid excessive wear.
4. Inappropriate cutting fluid: Choose an appropriate cutting fluid and improve the filtration conditions.
Low life of drill bit
1. The cutting speed is too high or too low, and the quantity of power is too large: use the appropriate quantity of cut.
2. The forest is inappropriate: modify the material of the tool;
3. Inappropriate cutting fluid: switch to a cutting fluid with extremely extreme pressure;
other
Chips in the shape of the band: the geometry of the circuit breaker is inappropriate; advanced geometry is inappropriate; ;
The chips are too small: the circuit breaker is too short or too deep;
Too many chips: the circuit breaker of the chip is too long or too shallow;