Carbide Drill Bits
Carbide drill bits are the among the hardest and most expensive in the industry. Carbides and tungsten carbide are a very hard materials with the ability to drill into almost every material but still maintaining an edge longer than other drill bits. Carbides are usually only found in tipped tools due to their brittleness and cost. Small pieces are brazed or screwed onto the end of a bit.
Sometimes however, solid carbide drills are available for use in certain industries for example PCB drills (printed circuit boards) where many holes are needed. The boards are made of fiberglass which is extremely abrasive and would ruin most other bits, so solid carbide tungsten twist bits are used, providing a longer life.
Drill bits undergo high stress and the constant rotation creates friction and therefore heat. This makes the bit a little duller after every use and the continual cycle of heating and cooling eventually compromises the internal structure of the bit.
Regular non-carbide bits wear out and break very quickly. Coated bits such as titanium carbide or titanium nitride coatings raise the lifespan of a bit. They will stay sharper and last longer and are the strongest bits available for domestic use. When drilling very hard and dense materials such as stainless steel, carbide bits are able to take the strain where most other bits would break. A carbide bit will last up to 24 times longer than a regular drill bit meaning they are an economical option for carpentry and furniture building where hard materials are used.
To lengthen the life span of the bit, using a lubricant can help when drilling dense material. It cools the drill bit as it drills and avoids excessive heat which can reduce the lifespan of the drill bit. Also do not press too hard when drilling as this will dull the bit. It can seem like this is helping, but it is important to allow the drill bit to do the work.
When drilling at high speeds, carbide and also ceramic tools are needed. While they may not be as tough at high speed as other materials, they have greater heat and wear resistance. Choosing the right coolant is paramount as different materials being drilled have different properties. With some the cooling effect is critical and with others, lubricity is needed.
Solid tungsten carbide, high-temperature grade is the most common material used for high speed drills. Chatter can sometimes be a problem but there are different grades of carbide and using a finer grade at high speed is key, such as a grain size of 0.5 microns compared to the more standard 2.5 microns. Finer grain carbide tools keep their toughness while resisting wear and tear at the same time.
Some solid carbide bits have a tough core made from two grades of cemented carbide sintered together. The core is also high strength grade and used for low speed center performance. For high speeds, wear resistant, low grade is used.
Companies that supply drill bits and accessories include Makita, Hilti and Irwin. Along with carbide drill bits, there are many other types and styles catering for different jobs on the market including long and short bits, glass and metal, ceramic, flexible, step drill bits, tile drill bits and brad point bits.
Carbide drill bits provide industries with a versatile material used for low and high speeds, industrially as well as in the home.
Tagged with: Brittleness • Carbide Bits • Carbide Drill Bits • Carbide Drills • Carbides • Ceramic Tools • Continual Cycle • Dense Material • Dense Materials • Drill Bit • Economical Option • Excessive Heat • Furniture Building • Hard Materials • Life Span • Solid Carbide • Tipped Tools • Titanium Carbide • Titanium Nitride • Tungsten Carbide
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