This is a chemical method that increases the hardness of the tool by putting the finished tool in a mixture of ammonia and steam and holding it at 540-560°c. High quality polished HSS bits are often white, and of course the rolled bits are also white to the smallest detail. First, how to determine the drill bit from the surface color? Today we will show you how to choose a high quality HSS drill bit. The substrate may be a chemical vapor deposited layer (TiN), or an ion implant of titanium, nitrogen, and carbon is physically applied above a certain depth, matrix or screw drill to form a layer of film. However, it also has the big drawback of low toughness and brittleness, in order to improve the hardness and wear resistance of the drill bit, 5-7 micron on hard titanium carbide (TiC) or titanium nitride of high speed steel. Inter-extrusion die can also be manufactured. HSS drills are mainly used to produce complex thin blades and impact resistant metal cutting tools, but they are suitable for high temperature bearings and cold casting such as turning tools, drill bits, hobs, machine saw blades and high demanding dies. These properties can be achieved by high-speed cutting with a special microstructure composed of a matrix of around 65 HRC even at high temperatures. HSS bits are a type of alloy bits made of HSS, which have excellent hardness, wear resistance, strength and toughness, heat resistance, corrosion resistance and other characteristics. High-speed steel (HSS) is a high carbon tool steel rich in tungsten and cobalt and rich in molybdenum, tungsten and vanadium. Some bits are made entirely of carbide alloys, while others have weld shanks, or drill shanks made of stainless steel, making each bit suitable for a particular machining. Carbide bits can be classified into solid carbide bits, carbide indexable bits, welded carbide bits, and carbide crown bits, depending on the manufacturing method. This drill not only has high hardness, but also excellent compressive strength and bending strength. The average particle size of the tungsten carbide phase is less than 1 micron. The hardness and strength of carbide drill bits are related not only to the content of tungsten carbide and cobalt, but also to the powder particles. Sinter forming of tungsten steel bit material is to press powder into blank, then put into sintering furnace to heat to a certain temperature (sintering temperature), maintain a certain time (insulation time), then cool And get the desired performance of tungsten. The grain size of the carbide component (or phase) is usually 0.2 to 10 microns, the binding metal is generally an iron group metal, and since cobalt and nickel are commonly used, tungsten cobalt alloy, tungsten nickel alloy, tungsten titanium cobalt There are alloys. Tungsten carbide, cobalt carbide, niobium carbide, titanium carbide and tantalum carbide are common constituents of tungsten steel. It usually contains 94% tungsten carbide, 6% cobalt, and 1% other metals (also called tungsten steel). High quality drill bits are generally made of carbide and high speed tool steel, but the former can cut XNUMX to XNUMX times faster than the latter.Ĭarbide drill bits are made as tungsten carbide powder and cobalt powder as matrix by pressing and sintering as their binder. Reamers and countersink drill bits cannot be used to drill holes in solid materials, but are traditionally considered drills. Commonly used drill bits mainly include spiral bits, flat bits, center bits, deep hole bits and bush bits. Drill bits are cutting tools with a circular cross section that create holes in alloy materials.
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