Do You Know The Reason Why The Drill Sleeve Is Not Durable On The Gantry CNC Drilling Machine?

BOSM gantry CNC drilling and milling machine is mainly composed of bed worktable, movable gantry, movable saddle, drilling and milling power head, automatic lubrication device and protection device, circulating cooling device, digital control system, electrical system and so on. With rolling line rail pair support and guidance, precision lead screw pair drive, the machine tool has high positioning accuracy and repeat positioning accuracy. It is used for high-efficiency cnc drilling of workpieces with thicknesses within the effective range, such as flat plates, flanges, discs, and rings.

CNC Drill through holes and blind holes can be realized on single material parts and composite materials. The machining process of the machine tool is digitally controlled, and the operation is very convenient. It can realize automation, high precision, multiple varieties and mass production.

So we found that the drill sleeve is not durable when using it. What is the reason? We together look!

1. The size of the inner hole is accurate, and the smaller the tolerance, the better, which can restrain the swing of the drill. The drill bit tolerance is increased by 0.01MM, and the product error is increased by 0.05MM, so the drill sleeve size must be μ-level to ensure the desired accuracy to a large extent.

2. The smoothness of the inner hole, the lighter the inner hole, the smaller the friction, the more obviously the life of the drill can be improved. The holes cut by the slow-moving wire seem to be bright. Because it is electric discharge machining, small spark holes will be left on the surface, which is also a killer of friction drills.

3. The concentricity of the inner hole and the outer hole, the concentricity is not high, the processing accuracy is also low, and the cumulative error will increase.

4. The hardness of the drill sleeve should not be too hard or too soft. Some drill sleeves are made of alloy, with high hardness and long life, but the damage to the drill tip is also great, just like an egg hitting a stone. The cost of cutting tools every month is staggering. A drill sleeve that is too soft has a short life and cannot guarantee long-term accuracy. Therefore, it is ideal to keep the hardness of the drill sleeve at about 60 degrees.


Post time: Nov-24-2021

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