First of all, we need to know that flash, also known as […]
First of all, we need to know that flash, also known as flash and flash, usually occurs in the open and closed positions of the mold. For example, the parting surface of the mold, the gap of the insert, the hole of the ejector, etc. If the overflow cannot be eliminated in time, it will cause part of the injection mold to collapse or even be damaged. In addition, the gap between the blades and the overflow of the thimble hole will cause the finished product to stick to the mold, thereby affecting the demolding process.
Factors leading to injection mold flash:
1. Improper adjustment of the mold clamping device or improper toggle mechanism of the injection molding machine will cause the mold to fail to achieve the required parallelism, resulting in a tight seal on one side of the mold and a firm seal on the other side, which is easy to overflow during the injection process.
2. The parallelism of the injection molding machine itself is problematic, and the uneven distribution of tie rods will also cause the mold to fail to close tightly and cause overflow.
3. The fixing ring of the injection molding machine is severely worn, the screws are too worn, the injection volume in the barrel is insufficient, and the cushion is too small, which may cause overflow.
4. Poor accuracy of the mold parting surface, deformation and warpage of the movable template (such as the middle plate), foreign objects on the parting surface and protruding sliding burrs around the mold base will cause the injection mold to overflow.
5. Unreasonable mold design. If the opening position of the mold cavity is offset too large, the unidirectional tension of the mold will be too large during the injection process, resulting in flash.