Injection molding parts processing must see! Reinforcement structure design tips

In the injection molding parts processing production process, the reasonable design of the reinforcement structure is essential to improve the strength, stiffness and dimensional stability of the product. In this article, we will introduce in detail how to design the reinforcing bar structure in the injection molding parts processing, in order to achieve the goal of optimizing product performance.

1. Function and role of reinforcement

Reinforcement is a kind of support structure added inside the plastic part, which can effectively improve the overall rigidity and load-bearing capacity of the product. Its role is mainly manifested in the following: firstly, it enhances the ability of the part to resist deformation by increasing the thickness of the local material; secondly, as part of the flow channel, it helps the filling and cooling of the molten plastic material; thirdly, it can evenly distribute the stress and reduce the risk of cracks or fractures caused by the concentration of the force.

2. Design principles

When designing reinforcement bars, the following basic principles should be followed: make sure that the reinforcement bars are reasonably laid out and do not hinder the function and use of the plastic parts; keep the thickness of the reinforcement bars moderate in order to avoid shrinkage and warping phenomena; the position and angle of the bars should be conducive to the flow and shrinkage of the plastic material. At the same time, considering the production efficiency and cost control, the design of reinforcement should also simplify the mold structure and reduce the difficulty of mold manufacturing.

3. Structural design points

When designing the structure of reinforcement, the following points should be noted: first, the height and width of the bar should be compatible with the wall thickness to avoid excessive internal stress; second, the direction of the bar is usually the same as the main direction of force to provide the best support; again, the cross or convergence of the bar should be designed as a staggered arrangement, to prevent the formation of a weak point; lastly, for large or complex parts, the trapezoidal or wave-shaped reinforcement bar can be used to improve the overall load-bearing capacity. to improve the overall bearing capacity.

4. Layout strategy of reinforcement

The layout of the reinforcement needs to consider the shape and functional requirements of the part. Generally speaking, the reinforcement should not affect the appearance of the part and the mating surface, and should not be installed in the parts that are easy to cause stress concentration. In addition, in order to balance the differences in anisotropy and shrinkage, a symmetric or circular symmetric layout can be adopted. Where possible, the naturally formed ribbed plate structure can also be utilized instead of the traditional reinforcement to obtain better mechanical properties.

5. Material selection and process adjustment

Different plastic materials may have different design requirements for reinforcement due to differences in their physical properties. For example, glass fiber reinforced materials have higher rigidity, so thinner reinforcement can be designed; while some easily shrinkable materials need to increase the thickness of the reinforcement appropriately. In terms of processing, defects due to improper reinforcement design can be reduced by optimizing injection parameters, mold temperature and holding time.