1．板材下料后在軋口之前，必須用倒角機或剪刀進行倒角工作。
1. after the blanking of the sheet, the chamfering machine must be operated with a chamfering machine or scissors.
2．劃線要據風管的不同尺寸形狀和規格分別進行，同時對同一段風管要完整進行，防止劃線錯孔和下料的多少有誤。
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．金屬薄鋼板制作的風管用咬口連接、鉚釘連接、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．板材剪切依據劃線的階段不同，分別進行，同時必須進行下料的復核，以免有誤。按劃線形狀用機械剪刀和手工剪刀進行剪切。
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. 剪切時，手嚴禁伸入機械壓板空隙中，上刀架不準放置工具等物品，調整板料時，腳不能放在踏板機上，使用固定式震動剪兩手要扶穩鋼板，手離刀口不得小于5cm，用力均勻適當。
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．咬口寬度和留量根據板材厚度而定
6. the width and quantity of the bite are determined according to the thickness of the sheet
7．焊接時必須焊縫均勻，無裂紋及加渣現象；鉚釘連接時，鉚釘中心先垂直于板面，鉚釘頭把材材壓緊，使板縫密合并排列整齊、均勻。板材之間鉚接，一般中間可不加墊料，設計規定時，遵循設計。
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．咬口時手指距滾輪護殼不小于50mm，手不準放在咬口機軌道上扶穩板料。
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，咬口后的板料將畫好的折方線放在折方機上，置于下模的中心線，操作時，使機械上刀片中心線與下模中心線重合，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．折方時應互相配合并與折方機保持一定距離，以免被翻轉的鋼板或配件碰傷。
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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