Cemented carbide drill bits are a tool for drilling through holes or blind holes in solid materials and expanding existing holes. Generally speaking, our common cemented carbide drill bits mainly include twist drills, flat drills, deep hole drills and nested drills. Although reamers and intermediate shafts cannot drill holes in solid materials, they are generally classified as drill bits.
So when we use cemented carbide drill bits, how should we operate and what should we pay attention to?
When machining with cemented carbide drill bits, it is not desirable that the chips are discharged in a long strip. Especially when processing tough materials, too long chips will cause chip jams and damage the tool. In this case, usually stop the feed and continue processing after chip removal. This method is called feeding in stages. In order to cut off the chips, a metal shim can be installed in the chip groove of the tungsten steel drill bit.
The standard hole depth is 5 times the diameter of the cemented carbide drill bits. If the tungsten steel blade is brazed on the shank, the depth can reach 7-8 times the diameter of cemented carbide drill bits. Of course, handling the chip is very important in that situation.
When the working surface is not flat, in order to prevent the blade from swaying and causing damage to the cutting edge, try to use a guide bushing so that the tungsten steel drill can cut into the processing material in a straight line.
The hole diameter of the cemented carbide drill bits is 20mm. When the hole depth is 12mm, a twist drill can be used. When the hole depth is 15mm, a long drill bit can be used. When the hole depth is 50mm, a barrel drill or a hole drilling tool can be used.