Design of inner horizontal plate and outer sowing plate of packaging steel belt

Design of inner horizontal plate and outer sowing plate of packaging steel belt
　　 The inner and outer templates supporting and securing the steel belt blade must also have a certain strength and hardness to avoid splitting and large compression deformation when subjected to force. In addition, it is also required to be easy to saw and machine; it must have good moisture resistance and not easily deform during use. At present, the template materials used in the steel belt die are birch laminate and rigid polyvinyl board. Because the strength of birch laminates is much higher than that of rigid polyvinyl plates, the former is generally used for conventional and sample steel strip dies, and the latter is often used for cutter-type steel strip dies. The thickness of the template is directly proportional to the thickness of the punched part. The greater the thickness of the punched part, the greater the thickness of the template used. The thickness of the template should adopt standardized specifications as much as possible. The mechanical properties of these two template materials are shown in Table 4-6.
The 　　 formwork becomes the inner formwork and the outer formwork after sawing. The shape of the inner template should be consistent with the inner shape of the blade of the steel belt. The minimum groove edge distance between the knife groove and the edge of the template cannot be too small, otherwise it may split at this place during the punching process. For small steel strip die, the minimum slot edge distance should not be less than 50 mm, and large steel strip die should not be less than 100 mm. In order to make the blade of the steel belt firmly tighten when it is pressed into the template, and it is not easy to loosen during use, the interference of the blade thickness of the steel belt to the groove should be about 0.2 mm; The amount remains at 0.08-0.12 mm. If the amount of interference is too small, it is easy to loosen; if the amount of interference is too large, it is difficult for the pressed steel strip to remain vertical, and the outer formwork will cause prestress and reduce the strength of the outer formwork.