The distance tensioning mechanism fails

The fixed distance tensioning mechanism such as the swing hook and the buckle is generally used in the mold of the fixed mold core or some secondary demoulding. Since the mechanism is arranged in pairs on both sides of the mold, the action requirements must be synchronized, that is, The mold is clamped at the same time, and the mold is opened to a certain position and unhooked at the same time. Once the synchronization is lost, it will inevitably cause the template of the pulled mold to be skewed and damaged. The parts of these mechanisms have higher rigidity and wear resistance, the adjustment is also difficult, the life of the mechanism is short, and the use of other mechanisms can be avoided.

In the case where the pumping force is relatively small, the spring can be used to push the fixed mold. When the core pulling force is relatively large, the core can be slid when the moving mold is retracted, and the structure of the splitting is performed after the core pulling operation is performed. A hydraulic cylinder can be used for core pulling on the mold. The skew pin slider core pulling mechanism is damaged. Most of the problems that occur in such institutions are that they are not processed and the materials used are too small. There are two main problems.

The angle of inclination of the skew pin A is large, and the advantage is that a relatively large core distance can be produced in a shorter mold opening stroke. However, when the excessive inclination angle A is adopted, when the extraction force F is a certain value, the bending force P=F/COSA received by the oblique pin during the core pulling process is also larger, and the skew pin deformation and the oblique hole wear are prone to occur. At the same time, the oblique pin produces an upward thrust on the slider N=FTGA, which increases the positive pressure of the slider on the guide surface in the guide groove, thereby increasing the frictional resistance when the slider slides. It is easy to cause slipping and the guide groove is worn out. According to experience, the inclination A should not be greater than 25