Have you encountered these questions when using drill bits: How are they made? About drill bit materials and their characteristics? Then let's learn more about it together.
The process of drill bit
1. According to the diameter and total length of the designed drill bit, you can choose the alloy bar cutting machine or use the wire cutting equipment for the fixed-length processing.
2. For the fixed length cut bar stock, the two end face flush can be realized on the manual tool grinder.
3. Chamfering or punching the ground end face of the alloy bar stock to prepare for grinding the outer diameter and shank of the drill bit, depending on whether the external grinding jig is used with a positive or negative center.
4. The outer diameter of the drill bit, the outer diameter of the shank and the outer diameter of the hollow part are processed on a high precision cylindrical grinding machine to ensure the cylindricity of the outer diameter, the circular runout and the surface finish.
5. In order to improve the processing efficiency on the CNC grinder, the drill tip part of the drill bit can be chamfered before the alloy bar is put on the CNC grinder, for example, the 140° drill tip angle can be roughly ground to 142° when chamfering.
6. After cleaning the chamfered alloy bar stock, transfer it to the CNC grinder process and process all parts of the drill bit on the five-axis CNC grinder.
7. If it is necessary to improve the chip groove and outer round finish of the drill, it can be polished with a wool wheel and abrasive before or after the 5th step, but in this case, the drill needs to be processed in more steps.
8. Laser engrave the drill bit with the company logo and drill size.

9. The marked drill bits are packed and shipped to a professional tool coating company for coating.

Processing problems of drill bits

1. When machining the outer part of the drill bit on the cylindrical grinding machine, you need to pay attention to the failure of the fixture and provide sufficient cooling to the alloy bar stock during machining, and keep a good habit of measuring the outer diameter size of the drill tip.

2. When machining the drill on the CNC grinding machine, try to separate the rough and finish machining in two steps when programming to avoid the existence of potential thermal cracks caused by too much grinding, which will affect the tool life.

3. Use reasonably designed material trays for tool handling to avoid damage to the cutting edge caused by knocking the tools against each other.
4. Use oil stone to open the edge of the diamond grinding wheel which has become black in grinding in time.

Material of drill bit
1. High-speed steel. High-speed steel (HSS) is a kind of tool steel with high hardness, high wear resistance and high heat resistance, also known as high-speed tool steel or sharp steel, commonly known as white steel. HSS tool is a tougher than ordinary tools, easier to cut tools, HSS has better toughness, strength, heat resistance than carbon tool steel, cutting speed than carbon tool steel (iron-carbon alloy) is much higher, so named HSS; and carbide just better than the performance of HSS, cutting speed can be increased by 2-3 times.
2. Cemented carbide. The main component of the drill material is tungsten carbide and cobalt, which accounts for 99% of all components and 1% of other metals, so it is called tungsten steel (cemented carbide). Tungsten steel is a sintered composite material that contains at least one metal carbide composition. Tungsten carbide, cobalt carbide, niobium carbide, titanium carbide, and tantalum carbide are common components of tungsten steel. The grain size of the carbide component is typically in the range of 0.2-10 microns, and the carbide grains are bonded together using a metal binder. The bonding metal is generally an iron group metal, commonly cobalt or nickel. Thus there are tungsten-cobalt alloys, tungsten-nickel alloys and tungsten-titanium-cobalt alloys. Sinter forming of tungsten steel drill bit material is to press the powder into a billet, then into the sintering furnace heated to a certain temperature (sintering temperature) and kept for a certain time (holding time), and then cooled down to get the tungsten steel material with the required properties.

VIDO is a manufacturer of professional tools, producing a wide variety of professional tools, including chainsaws, vacuum cleaners, drills and various other items. We have a wide variety of products and export overseas, which have been recognized by everyone. If you are interested in our company's products, you are welcome to contact our company.