The structural design of plastic products is a key link to ensure product quality, function and aesthetics. During the design process, many factors need to be considered, including glue thickness, reinforcement ribs, demoulding slope, fillet, etc., to meet the structural strength, appearance requirements and production efficiency of the product. This article will introduce the key points of plastic product structural design in detail and provide comprehensive guidance for designers.

Key points of plastic product structural design
Glue thickness (glue position):

The glue thickness of plastic products is usually between 0.80-3.00mm, thicker for large products and thinner for small products.
The glue position needs to be uniform to avoid sudden changes to ensure that the product does not shrink and can be fully glued.
Reinforcement ribs (bone position):

Reinforcement ribs can increase product strength and prevent deformation. The thickness is usually 0.5-0.7 times the overall glue thickness.
Ribs with larger heights need to be sloped to reduce demoulding resistance.
Demolding slope:

The demoulding slope is usually 1-5 degrees to ensure that the product can be demoulded smoothly without affecting the use function.
The front mold inclination of the product is usually 0.5 degrees larger than the rear mold so that the product can be left in the rear mold when the mold is opened.
Fillet (R angle):

Plastic products are usually rounded at the edges, and the minimum R is usually greater than 0.3mm to reduce stress concentration and facilitate demolding.
Hole:

It is best to make the hole into a regular round hole to avoid complex special-shaped holes.
The hole diameter should not be too small, and the ratio of hole depth to hole diameter should not be too large to ensure that the mold core is not easy to break or deform.
Boss (BOSS):

Bosses are used for shaft-hole matching or self-tapping screw assembly. When the height is large, cross ribs need to be added. The matching clearance is usually 0.05-0.10mm on one side.
Insert:

When designing with inserts, consider the positioning of the insert in the mold and the firmness of the connection with the molding part to avoid glue leakage.
Product surface texture:

Surface texture includes smooth surface, spark pattern, etched surface and engraved surface. The depth and number of textures affect the demolding resistance.
Text:

Surface text can be convex or concave. Concave text is easy to realize, while concave text needs to be made into a convex core.
Thread:

The thread precision requirement on plastic parts is not high, and a special thread removal mechanism is required.
Support surface:

The support surface usually does not use the entire surface, but is made into bosses, convex points, and ribs separately to avoid deformation and warping of plastic products.
Assembly form:

Including ultrasonic wire bonding, self-tapping screw assembly, hook-buckle assembly and BOSS shaft-hole assembly, each with its own advantages and disadvantages.
Tooth mouth:

The tooth mouth is usually made at the mating contact surface, with a depth of about 0.8-2.5mm, and a 0.1mm gap is left on the side.
Aesthetic line:

Aesthetic line is usually made at the mating surface, and the width is usually 0.2-1.0mm.
Surface treatment method:

Including spraying, silk screen printing, hot stamping, printing, electroplating, engraving, etching, polishing, adding color, etc.
Commonly used metal materials:

Including stainless steel, copper alloy, spring steel, aluminum alloy, zinc alloy.
Rust prevention methods for metal materials:

Including electroplating, anti-rust oil coating, and anti-rust paint spraying.

Conclusion
Plastic product structural design is a comprehensive project that requires comprehensive consideration of product functionality, aesthetics, production efficiency, and cost. Through careful design, it can be ensured that plastic products have good appearance and reliable performance while meeting the use requirements.