1、划线要据风管的不同尺寸形状和规格分别进行，同时对一段风管要完整进行，防止划线错孔和下料的多少有误。

1, the drawing line should be carried out according to the different sizes and specifications of the wind pipe, while a section of the wind pipe should be carried out completely to prevent the error of the wrong hole and the material.

2、板材剪切依据划线的阶段不同，分别进行，同时必须进行下料的复核，以免有误。按划线形状用机械剪刀进行剪切。

2, plate shearing is carried out according to the different stages of scribing. Meanwhile, the review of blanking must be carried out, so as not to be mistaken. Cut by mechanical scissors according to the shape of the line.

3、剪切时，手严禁伸入机械压板空隙中，上刀架不准放置工具等物品，调整板料时，脚不能放在踏板机上，使用固定式震动剪两手要扶稳钢板，手离刀口不得小于5cm，用力均匀适当。

3, when cutting, the hand is strictly prohibited into the mechanical plate gap, the upper tool holder is not allowed to place tools and other articles. When the plate is adjusted, the foot can not be placed on the pedal machine, and the fixed type vibration shears should be used to support the stable steel plate. The hand should not be less than 5cm, and the force is even and appropriate.

4、板材下料后在轧口之前，必须用倒角机或剪刀进行倒角工作。

4, after the cutting is finished, the chamfering machine or scissors must be used for chamfering.

5、金属薄钢板制作的风管用咬口连接、铆钉连接、焊接等不同方法。

5, different ways to make wind pipes, such as bite connection, rivet connection and welding.