What is a deep understanding of injection mold processing
Injection mold processing, but there is a planning principle: it is necessary to ensure that the ratio of the surface area of the runner to its volume is minimized, that is, when the length of the runner is certain, the ratio of the surface area or side area of the runner to its cross-sectional area is required to be the smallest. There are many types of runners, which vary with the structure of plastics and molds. Commonly used types are round, semi-circular, rectangular, trapezoidal, U-shaped, and regular hexagon.
The basic principles of injection mold processing planning: 1. When conditions permit, the cross-sectional area of the runner should be as small as possible, and the length should be as short as possible. 2. When the runner is long, a cold slug hole should be set at the end to contain the cold material and prevent air from entering , And the cold slug hole is generally set with a pulling rod to facilitate the release of the glue channel. 3. In a multi-cavity mold, the runners should be as consistent as possible and the length should be as short as possible. The cross-sectional area of the main runner should be larger than the cross-sectional area of the runners. The sum of the area, 4. The surface does not need to be too smooth (Ra=1.6), which is good for heat preservation. 5. If there are more runners, you should consider adding a split cone to prevent the molten plastic from directly impacting the cavity. Prevent the plastic from turning sharply and make the plastic transition smoothly.
6. The runner is generally distributed in a balanced way, and in special cases, an unbalanced method can be used. It requires that each cavity is filled with glue at the same time, compactly placed, and the process is short to reduce the size of the mold. 7. The runner should be smaller when planning. Dimension, so that there is a correction margin after mold trial.