How to optimize the structural design of roto-molding furniture molds to improve durability?

During the roto-molding process, the mold needs to withstand huge pressure from the plastic melt and thermal stress caused by temperature changes. These forces produce complex stress distribution inside the mold. If the design is not appropriate, it is easy to cause the mold to break or deform. Therefore, understanding the stress conditions of the mold is the first step in durability design.

Mold designers need to use advanced computer-aided design (CAD) and computer-aided engineering (CAE) tools to perform accurate stress analysis on the mold. These tools can simulate various forces in the roto-molding process and help designers identify potential stress concentration areas, so as to carry out targeted optimization in the design stage.

After understanding the stress conditions of the mold, how to reasonably distribute stress and avoid stress concentration becomes the key to improving the durability of the mold. This requires mold designers to make a series of fine adjustments in structural design.
Wall thickness design: The wall thickness of the mold is an important factor affecting its strength and stability. If the wall thickness is too thin, the mold is easy to break when under pressure; if the wall thickness is too thick, the weight of the mold will increase, the manufacturing cost will increase, and it will also be unfavorable for the uniform transfer of heat. Therefore, designers need to reasonably determine the wall thickness according to the specific purpose and stress conditions of the mold to ensure that the mold achieves the best balance between strength and stability.
Rib layout: Ribs are important structural elements in the mold to improve strength and rigidity. By reasonably arranging the ribs, the stress inside the mold can be effectively dispersed to avoid stress concentration. Designers need to carefully plan the position, quantity and shape of the ribs according to the shape and stress characteristics of the mold to ensure that the mold can withstand huge pressure and temperature changes during the rotational molding process.
Demolding slope design: Demolding slope is an easily overlooked but crucial detail in mold design. Reasonable demolding slope can ensure that the product can be smoothly removed from the mold after the rotational molding is completed, avoiding unnecessary damage to the mold. Designers need to accurately calculate the demolding slope according to the shape and size of the product and the characteristics of the mold material to ensure that the mold maintains good demolding performance during long-term use.

In the structural design of roto-molded furniture molds, the manufacturing process is also a factor that cannot be ignored. The synergy of design and manufacturing can ensure that the mold achieves the best performance and durability during the manufacturing process.
Material selection: The choice of mold material has a decisive influence on its durability. High-quality materials, such as aluminum alloy or stainless steel, have excellent corrosion resistance, wear resistance and high strength, and are the first choice for rotomolding furniture molds. Designers need to choose suitable materials according to the specific purpose and stress conditions of the mold to ensure that the mold maintains good performance during long-term use.
Manufacturing process optimization: In the mold manufacturing process, the use of advanced CNC machine tool processing technology and precise mold detection technology can ensure that every detail of the mold meets the design requirements. These technologies can significantly improve the manufacturing accuracy and surface quality of the mold, thereby further improving its durability.
Heat treatment process: Heat treatment is one of the important means to improve the durability of the mold. Through a reasonable heat treatment process, the microstructure of the mold material can be improved, and its hardness and wear resistance can be improved. Designers need to work closely with the manufacturing team to ensure that the heat treatment process matches the mold design to achieve the best durability effect.