1．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。
1. after the blanking of the sheet, the chamfering machine must be operated with a chamfering machine or scissors.
2．划线要据风管的不同尺寸形状和规格分别进行，同时对同一段风管要完整进行，防止划线错孔和下料的多少有误。
2., the line shall be carried out according to the different sizes, shapes and specifications of the air duct. At the same time, the same section of the wind pipe shall be carried out in a complete way to prevent the marking of the wrong holes and materials.
3．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。
3. 、 the different methods of wind connection, bite connection, rivet connection and welding produced by metal sheet.
4．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和手工剪刀进行剪切。
4. plate cutting according to the different stages of the line, respectively, and must be reviewed at the same time, so as to avoid errors. Cut by mechanical scissors and hand scissors according to the crossed shapes.
5. 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。
5. when the shear plate gap into mechanical hand is allowed to be placed on the turret, tools and other items, the adjustment sheet, the foot pedal can not be placed in the machine, the use of fixed shear vibration to hands hold the hand from the edge of plate, not less than 5cm, the appropriate uniform force.
6．咬口宽度和留量根据板材厚度而定
6. the width and quantity of the bite are determined according to the thickness of the sheet
7．焊接时必须焊缝均匀，无裂纹及加渣现象；铆钉连接时，铆钉中心先垂直于板面，铆钉头把材材压紧，使板缝密合并排列整齐、均匀。板材之间铆接，一般中间可不加垫料，设计规定时，遵循设计。
7. welding weld must be uniform, no crack and slag phenomenon; rivets, rivet center first perpendicular to the surface of the wood pressing rivet head, the seams are closely combined in order and uniform. Between the plate riveting, generally may not add the padding in the middle, when the design stipulation, follows the design.
8．咬口时手指距滚轮护壳不小于50mm，手不准放在咬口机轨道上扶稳板料。
8., when the mouth, fingers from the roller shell is not less than 50mm, hands are not allowed in the mouth of the machine to track the stability of the plate.
9，咬口后的板料将画好的折方线放在折方机上，置于下模的中心线，操作时，使机械上刀片中心线与下模中心线重合，折成所需要的角度。
9, after the bite of the plate, will draw a good square line on the folding square machine, placed in the center line of the lower die, when the operation, so that the mechanical blade center line and the lower die centerline coincide, fold into the required angle.
10．折方时应互相配合并与折方机保持一定距离，以免被翻转的钢板或配件碰伤。
The 0% off sides should cooperate with each other and keep a certain distance with the folding machine so as not to be upset by the overturned steel plate or fittings.
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