Eight rules for designing molds in injection molding plants


  Injection Molding is a versatile process that ca […]


Injection Molding is a versatile process that can be applied to almost any product. Injection molding is an injection molding factory that manufactures parts according to industry standards. There are several basic guidelines to consider.

First, the maximum wall thickness.

The wall thickness components are directly proportional to match the components to the required cooling time. By reducing the maximum thickness of the component wall, the effects of these two factors can be reduced, thereby reducing cycle time and thereby reducing production costs. If the walls of your parts are too thick or inconsistent, the problem may involve sinking and warping, resulting in scrap and expensive redesigns, ensuring that the wall thickness matches the machine.

Second, the corner.

The problem in a mold, the angle is not always flush, it is almost impossible to force the plastic product to have a perfect angle, the result will appear messy and amateur, not to mention the strength of the parts may be greatly reduced, so all corners To maximize the aesthetics and durability.

Third, the draft.

The draft is a small angle, usually one or two degrees perpendicular to the dividing line, applied to the face on the mold, which will easily remove the piece from the injection mold, not applied to the draft in the injection molding plant design, will This means that the injection molding machine will not operate the automatic injection system.

Fourth, the ribs.

The ribs are part of the structural elements of the mould and are used for overall stability control. They are thin-walled protrusions that extend vertically from the wall or plane. Adding ribs instead of thicker walls provides greater structural support.

Fifth, the boss.

Bosses usually accept hollow cylindrical protrusions designed with screws or other matching parts to ensure that these are connected by one of the walls to the wall or add ribs, meaning that the bulge will remain and accept the fixing, it is designed to have no effect.

Sixth, the outer bottom cut.

The cavity half protrudes or dents on the outside of the mold, which can cause problems when the mold separates the parts, and adjust your parting line to accommodate this.

Seventh, the internal undercut.

Similar to the outer undercut, the raised or recessed mold is half of the inner core.

Eighth, thread.

If your mold contains a thread, always arrange it for vertical parting, which will ensure that the vulnerable thread is not damaged. If possible, don't have a thread in your design. Simplifying your design will reduce the chance of a mess.