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Spiral air duct is a thin pipe with spiral undercut made of metal strip material roll. It is round without welding. It is often used for air supply and fresh air gas flow transportation to replace the white iron pipe in the past. At present, in the market, stainless steel materials are more favored by the market. The main reason is that most people should understand the characteristics of stainless steel. It is not easy to rust and corrode. But the material with this characteristic will inevitably encounter the difficulty of cutting

1.切割力大，切割溫度高。本實用新型材料強度大，切削時切向應力大，塑性變形大，因而切削力大。另外，材料的導熱性很差，導致切削溫度升高，高溫往往集中于刀刃附近較窄的區域，從而加速其磨損。

1. Large cutting force and high cutting temperature. The utility model has the advantages of high material strength, large tangential stress and large plastic deformation during cutting, so the cutting force is large. In addition, the thermal conductivity of the material is very poor, resulting in the increase of cutting temperature. The high temperature is often concentrated in the narrow area near the blade, so as to accelerate its wear.

2.不銹鋼風管加工硬化嚴重。奧氏體不銹鋼及部分高溫合金不銹鋼均為奧氏體組織，切削時易發生加工硬化，加工硬化傾向于高出普通碳鋼數倍，刀具在加工硬化區域內切削，壽命縮短。

2. Severe work hardening of stainless steel air duct. Austenitic stainless steel and some high-temperature alloy stainless steel are austenitic structure, which is prone to work hardening during cutting. The work hardening tends to be several times higher than that of ordinary carbon steel. The service life of the tool is shortened when cutting in the work hardening area.

3.容易粘刀。對于奧氏體不銹鋼和馬氏體不銹鋼，都有切屑強韌、切削溫度很高的特點。強力韌性的切屑流經前刀面時，會出現粘合、熔焊等粘刀現象，影響加工配件表面粗糙度。

3. It is easy to stick the knife. Both austenitic stainless steel and martensitic stainless steel have the characteristics of strong and tough chip and high cutting temperature. When strong and tough chips flow through the rake face, there will be adhesion, fusion welding and other adhesion phenomena, which will affect the surface roughness of machined accessories.

4.刀具磨損會加速。以上物料普遍含有高熔點，塑性大，切削溫度高，使其磨損加速，磨刀、換刀頻繁，從而影響生產效率，提高其使用成本。以降低切割線速度、進給量為主。使用特殊的不銹鋼或高溫合金加工刀具，鉆、攻絲或內冷較好。

4. Tool wear will accelerate. The above materials generally contain high melting point, large plasticity and high cutting temperature, which accelerate their wear and frequently grind and change knives, thus affecting the production efficiency and improving their use cost. Mainly to reduce the cutting line speed and feed rate. Using special stainless steel or superalloy cutting tools, drilling, tapping or internal cooling is better.