​​​​​​​Injection mold design: bevels and chamfers

In injection mold design, bevels and chamfers are two very important design elements. They can help solve common problems during the molding and demoulding process, improving product quality and production efficiency.

The following is what Universe Plastics engineers share about the role and experience of bevels and chamfers in injection mold design:

Mold bevel function and design

Bevel angle is the inclination angle of the mold cavity surface relative to the mold parting line. The function of the bevel is to help the mold open better and the product to be demoulded, so as to avoid damage to the product during the demoulding process.

Design:

1. The generally recommended minimum bevel angle is 1° to 2°. For complex structures or deep cavity products, the bevel angle can be larger.

2. Ensure that all vertical surfaces have consistent bevel angles to avoid uneven demoulding.

3. Both the inner wall and the outer wall need to be designed with bevel angles. The bevel angle of the inner wall is usually larger than the bevel angle of the outer wall.

Mold chamfering function and design

Chamfering is a method of flattening or rounding sharp edges of molds. The function of chamfering is to reduce stress concentration and prevent mold cracking and damage.

Design:

1. The size of the chamfer should be designed according to the thickness and purpose of the product, usually 0.5mm to 2mm.

2. It can be a simple 45° angle, or it can be a rounded corner or arc chamfer, designed according to actual needs.

3. All parts where stress concentration may occur, such as screw holes, edges, joints, etc., must be chamfered.