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How To Drill Stainless Steel Sheet

Aug 11, 2021

How to drill stainless steel sheet

  1. Stainless steel sheet drilling is currently mainly divided into manual drilling, hydraulic and electric semi-automatic drilling.

  2. The hydraulic drilling speed is relatively fast, the drilling effect is beautiful, and it is smooth and free of burrs.

  3. Adjustable speed hand electric drills can also be drilled into stainless steel sheets, the key is what kind of drill bit to use, you can buy an alloy drill bit.

Twist drills are often used to drill stainless steel sheet workpieces. For hardened stainless steel sheets, cemented carbide drills can be used, and ultra-hard high-speed steel or ultra-fine grained carbide drills can be used when conditions permit. When drilling, the torque and axial force are large, the chips are easy to stick, not easy to break and chip removal is difficult, the work hardening is intensified, the corners of the drill are easy to wear, and the poor rigidity of the drill is easy to produce vibration. Therefore, the drill is required to grind the chip flutes, sharpen the chisel edge to reduce the axial force, and sharpen the double apex angle to improve the heat dissipation conditions.

When drilling stainless steel sheets, it is often found that the drill bit is easy to wear and break, the hole surface is rough, sometimes deep grooves can not be eliminated; the hole diameter is too large, the hole shape is not round, or inclined to one side. Pay attention to the following items during operation:

  1. The geometry must be sharpened correctly, and the two cutting edges must be symmetrical. If the back angle of the drill bit is too large, it will produce the phenomenon of "cutting the knife", causing chattering, and making the drilled hole take on a polygonal shape. The chisel edge should be sharpened to reduce the axial force of the hole.

  2. The drill bit must be installed upright, keep the drill bit sharp, and sharpen it in time after being blunt.

  3. Reasonably choose the geometric parameters of the drill bit and the amount of drilling. According to the drilling depth requirement, the length of the drill bit should be shortened as much as possible, and the thickness of the drill core should be increased to increase rigidity. When using high-speed steel drills, the cutting speed should not be too high to prevent the burning of the blade. The feed amount should not be too large to prevent the drill bit from aggravating or causing the hole to have deviated. The feed amount should be appropriately adjusted when cutting in and out.

  4. Adequate cooling and lubrication. The cutting fluid is generally vulcanized oil. The flow rate should not be less than 5~8 L/min. The cooling should not be stopped midway. When the diameter is large, internal cooling should be used as much as possible.

  5. Pay attention to the drilling process and observe the chip discharge status in time. If the chips are found to be disorderly wound, immediately return the tool for inspection to prevent the chip from clogging. Attention should also be paid to the sound of the machine tool. If an abnormality is found, the tool should be withdrawn in time, and the drill should not be allowed to stay on the drilling surface to prevent the hardening of the drilling surface from intensifying.