The quality of the self-made ejector is better, but the processing cost is too high. Now, standard parts are generally used, and the quality is poor. If the gap between the ejector pin and the hole is too large, there will be leakage, but if the gap is too small, the ejector pin will be stuck due to the increase of mold temperature during injection. What's more dangerous is that sometimes the...

For large molds, due to the different filling rates in all directions, and the influence of the self-weight of the mold when the mold is installed, the moving and fixed molds are offset. The lateral deflection force will be applied to the guide pillar during injection. When the mold is opened, the surface of the guide pillar will be rough and damaged. In severe cases, the guide pillar will be...

Fixed-distance tensioning mechanisms such as swing hooks and hasps are generally used in fixed mold core pulling or some secondary demolding molds. Because such mechanisms are arranged in pairs on both sides of the mold, their actions must be synchronized, that is, When the mold is closed, it is buckled at the same time, and when the mold is opened to a certain position, the hook is released at...

The guide pillars mainly plays a guiding role in the mold to ensure that the molding surfaces of the core and the cavity do not touch each other under any circumstances, and the guide pillars cannot be used as a force-bearing part or a positioning part. In the following cases, when the injection is moved, the fixed mold will generate a huge lateral deflection force: (1) When the wall thickness...

When the mold is injected, the molten plastic in the mold cavity produces a huge back pressure, generally 600 ~ 1000 kg/cm2. Mold makers sometimes do not pay attention to this problem, and often change the original design size, or replace the moving template with low-strength steel plates. In the mold with ejector ejector, due to the large span between the seats on both sides, the template...

The cooling effect of the mold directly affects the quality and production efficiency of the product, such as poor cooling, large shrinkage of the product, or uneven shrinkage and deformation of the warped surface. On the other hand, the whole or part of the mold is overheated, so that the mold cannot be formed normally and production is stopped. The design and processing of the cooling system...

The structural form of the injection mold and the processing quality of the mold directly affect the quality and production efficiency of the plastic parts. Sometimes there might have such problems, for example, the injection molded part cannot drop off freely. The part is stuck on the gate. During the injection molding process, the gate sticks to the gate sleeve and is not easy to come out....

The drive and driving force of the injection mold processing movement (pressing force, mold clamping force, material drop weight, extrusion force, etc.) are provided by the power of the forming machine tool and equipment through the transmission mechanism. Electromechanical drive: such as punching machines, friction presses, roll forging machines, etc., are powered and rotated by electric...

When we EDM the mold, both the positive electrode and the negative electrode will be corroded by different degrees of electrode, even if the corrosion amount of the two electrodes of the same material is different, we will find that one electrode is more corroded than the other electrode. This phenomenon is usually called the polarity effect. If the two electrode materials are different, the...