The function of the process tab is mainly to assist the casting of the grid, or to assist the manufacturing in the processes or operations such as coating, forming, drying, and handling. The reasonable design of the process lugs can not only ensure the consistency and stability of the quality of the product in the whole manufacturing process, but also greatly improve the production efficiency. Therefore, the process tabs are essential in the production process.
The design of the process tabs is based on the realization of functional requirements and the convenience of production as much as possible, and the weight of the fake tabs (all or part of the process tabs) should be reduced as much as possible, because the fake tabs do not enter the final product, and need to be If the weight is too large, the loss in the furnace will be more and the amount of contaminants may be increased. In addition to this consideration, the influence of the false tabs on the entire grid structure should also be considered, such as whether the shrinkage holes are increased, whether the air holes are increased, etc.
Good craftsmanship ear design is both practical and simple. As shown in Figure 1, the structure diagram of the process tabs of three large and small plates, the upper and lower double-row grids are connected with four pieces, and the plate tabs are close to the middle position. The function of adding small process tabs is to support the large process. Pole ear. During the formation, the raw electrode plate should be inserted into the formation groove, which is called a plug-in plate. When the plate is inserted, the electrode plate is dropped on the conductive bar of the formation groove by gravity. If there is no support from the small tab, the large tab will bend. . The connection between the small craft tab and the grid is made of a very thin small connection. After the electrode plate is formed, it is cut from the saw edge. The contact between the small craft tab and the electrode plate is small. It will fall off as soon as it is broken, and the burrs formed on the polar plate are very small, and it will be clean with a brush of the earphone. In the whole plate manufacturing process, the small dummy tabs play an important auxiliary role. The addition of the small electrode lugs is also beneficial to the casting of the grid, and this structure also makes the electroconductivity very good.
Figure 1-b shows the process connection structure of a single large plate. The feature of this structure is that the true tab is designed at the bottom to increase the uniform distribution of the current during formation. During formation, the current passes through the process small tab and The uniformity of the formation is obviously improved when the real electrode is used for power supply. Generally, the current of the large plate is large, and the distributed power supply is an important method. In addition, it is also possible to change the direction of the pole plate up and down and lift the real pole ear up. This structure does not distribute the current better than the structure shown in Figure 1-b. Others use real tabs as process tabs. This method turns the current into only the real tabs to supply electricity, and does not disperse the power supply, which will cause the current to be too concentrated, resulting in uneven formation of the plates. Figure 1-c shows the state of the three-layer and nine-piece connection process tabs. This structure is beneficial to the formation and production of each process. Generally, the width of the connecting bar under the large process tab is 5 mm, and the thickness is the same as that of the grid.
A large grid may be composed of one, two or more pieces, which requires the design of the slit, and the slit should be designed according to the requirements of the slicing machine. There may be large differences in the width, thickness and arrangement direction of the pole plate between the rolling and sawing type, and should be designed according to the specific conditions of the equipment. If the thickness of the saw blade used for slicing is 2.0 mm, it is appropriate to design the saw edge to 2.1 mm. If a rolling cutting machine is used, the cutting edge is generally designed to be 0.6 mm, and it can also be designed according to the technological requirements of the equipment.
