1. The thickness of undercut shall be within the range specified by various specifications. If it is less than the minimum thickness, it is easy to produce cracks, wrinkles and other defects during the biting process. If the thickness is greater than the maximum thickness, because the thickness of the plate is proportional to the square, the obvious increase of bending force will cause abnormal damage to the forming roll, which will overload the transmission system and cause failure.

2. 咬口機的加工能力是根據普通鋼板的加工而設計的，常用的普通鋼板、鍍鋅鋼板和塑料復合鋼板具有良好的咬口成型性能。不銹鋼板的強度應高于普通鋼板，在使用不銹鋼板咬之前，要做成形試驗，以免使設備超負荷工作，造成過度磨損或機械事故。由于鋁板塑性差，易開裂咬口成型，施工前也要做成型試驗，同時，由于鋁板缺乏彈性，鋁板風道不能按鍵式咬口。

2. The processing capacity of the undercut machine is designed according to the processing of ordinary steel plate. The common ordinary steel plate, galvanized steel plate and plastic composite steel plate have good undercut forming performance. The strength of stainless steel plate shall be higher than that of ordinary steel plate. Before using stainless steel plate to bite, the forming test shall be carried out first to avoid overload of equipment and excessive wear or mechanical accident. Due to the poor plasticity of the aluminum plate, it is easy to crack and form the undercut. Before construction, it is also necessary to conduct the forming test. At the same time, due to the lack of elasticity of the aluminum plate, the aluminum plate air duct cannot be button type undercut.

3.板咬入部分的更小長度不小于300mm。否則,水平阻力引起的板咬太少接觸板和成型輥的摩擦力大于喂食板,導致板成型輥之間的滑移和加速形成的磨損輥的一部分。

3. The minimum length of the bite part of the plate shall not be less than 300 mm. Otherwise, the friction between the forming roll and the plate caused by the horizontal resistance is greater than that of the feeding plate, which leads to the slippage between the forming rolls and the accelerated formation of a part of the wear roll.

4. 使用前，進給導軌的調試應嚴格按照設備的調試要求進行，調整到規定的位置和尺寸后將進給導軌固定。如果進給導軌的實際位置小于規定的位置尺寸，則咬口不成形。如果它的尺寸大于規定的位置尺寸，則咬入的尺寸是超差的，因為進給過寬，導致兩塊板不能咬入或浪費材料;當進給鋼軌嚴重歪斜時，容易產生咬入寬度不均勻的偏差缺陷。

4. Before use, the feed guide rail shall be debugged in strict accordance with the debugging requirements of the equipment, and the feed guide rail shall be fixed after being adjusted to the specified position and size. If the actual position of the feed guide rail is less than the specified position size, the undercut will not be formed. If its size is larger than the specified position size, the bite size is out of tolerance, because the feed is too wide, resulting in two plates can not bite or waste materials; when the feed rail is seriously skewed, it is easy to produce deviation defects with uneven bite width.

5. 上、下成型輥徑向預留間隙的調整，不僅要求適當的松緊，而且要一致。如果預留間隙太小，喂食困難，即使強行進入，咬痕開裂嚴重;如果間隙過大，則會導致在成形輥中出現不規則的咬形或卡瓦。使用不銹鋼板或鋁板咬口時，徑向預留間隙應大于相同厚度的鋼板間隙調整，否則會造成設備過載或咬口開裂現象

5. The adjustment of the radial reserved clearance of the upper and lower forming rollers requires not only proper tightness, but also consistency. If the reserved gap is too small, feeding is difficult, even if forced entry, the bite marks will crack seriously; if the gap is too large, irregular bite or slip will appear in the forming roll. When stainless steel plate or aluminum plate is used for undercut, the reserved radial clearance shall be greater than the clearance adjustment of steel plate with the same thickness, otherwise the equipment will be overloaded or the undercut will crack