How to design the draft angle of the mold?

author: Universe plastic

2024-05-06

What is mold draft angle?

The mold draft angle refers to the relative movement angle of each part of the mold during the opening and closing process of the mold. This angle has an important impact on product quality and production efficiency.

If the draft angle is too large, the product may be deformed or damaged; if the draft angle is too small, the product may be difficult to demould, or even get stuck in the mold and cannot be removed.

Draft angle design

In practical applications, the determination of the draft angle needs to consider multiple factors, such as the shape, size, material, etc. of the product. It affects the manufacturing and use of the mold. The following are some suggestions on the design of the mold draft angle:

1. Understand the importance of draft angle

Draft angle refers to the angle between the part of the mold used for drafting and the normal line of the mold parting surface. This angle is critical to the mold ejection process because it determines how easily the parts in the mold can be ejected.

2. Design according to product shape

For products with complex shapes, structures, and sizes, a larger draft angle needs to be used to ensure product quality; while for simple products, the draft angle can be appropriately reduced to improve production efficiency.

3. Pay attention to the uniformity of draft angle

Uniformity of draft angle is also very important. Uneven draft angles may make mold making and product forming more difficult. Therefore, sudden changes in draft angle and sharp angles should be avoided as much as possible.

4. Follow production usage methods

The design of the draft angle should be consistent with the demoulding direction to ensure that the product can be smoothly removed from the mold.

5.Design according to mold type

Different mold types and production processes may also have an impact on the draft angle. For example, hot runner molds usually require a larger draft angle to facilitate plastic flow and filling; while cold runner molds can be reduced by reducing the draft angle. Reduce plastic usage and lower costs.

6. Designed according to injection molding materials

The draft angle should be appropriately adjusted based on product material factors to ensure smooth demoulding without affecting product quality.

Summarize

Mold draft angle design is a process that requires experience and skills, and needs to be appropriately adjusted according to the specific mold design and product requirements.

When designing and manufacturing molds, various factors should be fully considered and appropriate draft angles should be selected to ensure product quality and production efficiency.

CNC machining mold manufacturing process

EDM processing: injection mold