What is Draft Angle in Plastic Injection Mold Design?
Draft angle is the angle between the parting surface of the mold cavity and the parting surface of the mold. In the injection molding process, the design of the draft angle directly affects the demolding effect of the mold. A reasonable draft angle can ensure that the molded part is smoothly ejected from the mold, reduce the defect rate, and improve production efficiency.
Basic Principles of Draft Angle Design：
The draft angle should be greater than 0°, generally between 1° and 5°.
The size of the draft angle should be comprehensively considered based on the shape, size, material, wall thickness, surface texture, and other factors of the molded part.
For complex molded parts, a multi-draft angle design can be used, that is, different draft angles are set in various parts to adapt to different demolding requirements.
Precautions for Draft Angle Design：
The draft angle should be uniform and consistent, and avoid local sharp corners or grooves.
The draft angle should be consistent with the demolding direction of the molded part.
The draft angle should consider the shrinkage of the molded part.
The draft angle should be as large as possible under the premise of not affecting the appearance and performance of the molded part.
Correctly designing the draft angle is an important part of plastic mold design. A reasonable draft angle can improve the production efficiency and product quality of the mold.
