Tap (TAP) has the following several common surface treatment, one is the oxidation treatment (tap surface rust), two nitrogen treatment (usually said, three is nitriding) of Ti coating (TIN), four titanium aluminum nitride processing

1, oxidation treatment:

This kind of processing is to tap on the 500-550 of steam heating 30-60 minutes, resulting in tap surface Fe3O4 (rust), this is a kind of oxidation, the oxide film thickness range of 1-3 microns, the porous film, to maintain cutting oil to reduce friction heat, and prevent the surface melting the role of general use for tapping operation stainless viscous material is strong on.

2, nitriding treatment:

This kind of treatment is the wind grass will tap on 500-550 degrees, the addition of nitrogen, heat 30-90 minutes, can get reliable smooth and uniform surface hardness and stability, hardness of nitride layer mainly depends on time and temperature, improve the surface hardness of nitrided tap, enhanced wear resistance, improved the high temperature heat resistance of tap, tap, good cutting performance by nitriding surface hardness, tap will increase to about 1300HV, about 64HRC to the hardness of the matrix, thermosetting resin, gray cast iron, Aluminum Alloy die-casting parts, from the shape of cutting, flake, granular chip very effective. So the use of common tap nitriding (but rarely used screw tap), but can not adapt to the processing of steel, otherwise there is danger of tipping.

3, Ti coating:

Is a kind of titanium nitride, titanium coating material is mainly through physical vapor deposition method, at 500 degrees and tap preheating is generated on the surface of negative pressure effect of fine solid titanium nitride (TIN) coating, TIN coating is golden yellow, and the tap matrix adhesion is very good, the surface hardness 2000HV, layer thickness of 1-3um, and has the following characteristics:

Improve the surface hardness, improve the wear resistance, reduce friction coefficient, anti bonding, and improve the heat resistance.

4. Aluminum nitride coating:

This is a V coating, coating with almost TIN, thickness of 3-6um, the surface hardness of 3000HV, viscous resistance and wear resistance of the coating is much better than TIN, more adaptable, such as stainless steel for hard cutting materials, alloy steel, Quenched and tempered steel, the cutting effect of alloy tool steel has good advantages. It is in high speed, high dilution conditions, to fully demonstrate its superiority, the surface treatment of wire tapping a great impact, the same material, the same silk attack, but life is apparent, especially stainless steel reaction is more intense, such as: white silk attacking 316 stainless material when tapping tapping times around several times or dozens of times, but once an oxidation treatment, tap to attack the hundreds of times; such as Ti treatment, early life will reach thousands of times, visible surface treatment in certain degree. An inestimable role. Of course, different materials are not the same, for aluminum, tapping just make a heat treatment at the Department of teeth (nitriding) is very good, do not effect other surface treatment will be better, so screw surface treatment can not be generalized, according to different materials in tapping.

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