Weigh the tungsten steel drill bit and the ordinary drill bit or white steel drill bit in your hand. The tungsten steel drill bit is heavier. Grind it on an ordinary gray grinding wheel. The sparks of the tungsten steel drill bit are dark red and difficult to grind. The sparks of ordinary drill bits or white steel drill bits are brighter. Tungsten steel drill bits are brittle. If they fall from your hand, a piece of the cutting edge will break off, while other drill bits will not break off. Tungsten steel drill bits have a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, and corrosion resistance. In particular, its high hardness and wear resistance remain basically unchanged even at a temperature of 500°C, and it still has a high hardness at 1000°C.
Tungsten steel drill bit
Tungsten steel drill bits are tools used to drill through holes or blind holes in solid materials and expand existing holes. Generally, the common tungsten steel drill bits we have are twist drills, flat drills, center drills, deep hole drills, and trepanning drills. Although reamer and countersink cannot drill holes in solid materials, they are usually classified as drill bits. So how should we operate when using tungsten carbide drill bits and what should we pay attention to?
1. Chip handling:
When processing with tungsten carbide drill bits, it is not desirable for the chips to be discharged in a long strip. Especially when processing materials with relatively strong toughness, the chips will be blocked if they are too long, thus damaging the tool. In this case, the feed is generally stopped, and the chips are cleared before continuing the processing. This method is called staged feeding.
In order to cut off the chips, a metal gasket can be installed in the chip groove of the tungsten carbide drill bit.
2. Drill bit diameter and hole depth
The standard hole depth is 5 times the drill bit diameter. If it is a type of brazed tungsten carbide blade on the shank, the depth can reach 7-8 times the diameter of the tungsten carbide drill bit. Of course, in that case, chip handling is very important.
3. Use of guide sleeve
When the working surface is uneven, in order to prevent the tip from shaking and causing damage to the cutting edge, use a guide sleeve as much as possible so that the tungsten steel drill can cut into the processing material in a straight line.
4. Approximate standards for hole diameter, hole depth and tool selection
When the hole diameter is 20mm and the hole depth is 12mm, a twist drill can be used, when the hole depth is 15mm, a long drill bit can be used, and when the hole depth is 50mm, a barrel drill can be used, or the hole opening tool in the BTA tool can be used.
