In the automotive manufacturing industry, the performance of the auto mold directly affects the quality of the parts and production efficiency. Among them, mold sticking is a common and difficult to solve technical problem. Mold sticking not only causes surface defects of parts, affects the appearance and function of the product, but also may cause mold damage and increase the subsequent maintenance and replacement costs. Therefore, in-depth research on the causes of mold sticking and its solutions is crucial to improving production efficiency and product quality.

The causes of mold sticking are complex and diverse, mainly including factors such as excessive mold surface roughness, insufficient lubrication, improper temperature control, strong adhesion of plastic materials, and unreasonable molding process parameter settings. When dealing with mold sticking problems, scientific solutions must be taken from mold design, material selection, process control, lubrication management, and mold maintenance to ensure the smooth progress of the production process and the steady improvement of product quality.

In the mold design process, scientific structural design and surface treatment are the basis for preventing mold sticking. During the design process, the area of ​​direct contact between the mold and the plastic material should be minimized, and a reasonable mold parting surface design should be adopted to ensure that the mold parting line is smooth and has no sharp angles or dead corners, so as to avoid mold sticking caused by stress concentration and local overheating. In addition, the mold surface should be designed with reasonable exhaust grooves and exhaust holes to ensure that the gas can be discharged smoothly during the molding process, thereby reducing the problem of sticking caused by gas retention. In terms of surface treatment, high-quality polishing technology is used to make the mold surface achieve a mirror effect, reduce the surface roughness, and thus reduce the adhesion between the plastic and the mold. For parts areas that are prone to sticking, you can consider applying a layer of anti-sticking coating on the mold surface or using special anti-sticking materials to further reduce the probability of adhesion.

Material selection is one of the key factors in solving the problem of sticking. When selecting mold materials, mold steel or alloy materials with low adhesion, high temperature resistance and wear resistance should be given priority, and their thermal conductivity and corrosion resistance should also be paid attention to. For plastic materials, suitable lubricants or release agents should be selected according to the characteristics of the mold material to ensure that it has excellent lubrication and heat resistance. In practical applications, it is particularly important to select a release agent that meets the process requirements. High-quality release agents can form a thin film on the mold surface, effectively reducing the direct contact between the plastic and the mold, thereby reducing the incidence of sticking. When using, be sure to ensure that the release agent is evenly applied to avoid uneven coating or missing areas, so as not to affect the demolding effect.

Lubrication management is one of the important measures to control mold sticking. During the injection molding process, the reasonable application of lubricants can significantly reduce the friction coefficient between the mold and the plastic, thereby reducing the adhesion phenomenon. The selection of lubricants should be based on the specific requirements of the plastic material and mold process, and select lubricants with good high temperature resistance, stable lubrication performance and no effect on the quality of the parts. The lubricant should be applied evenly to avoid local excessive thickness or thinness to ensure the continuity and stability of the lubricating layer. During the production process, regularly check the effect of the lubricant, replenish or replace it in time to maintain the continuity of the lubrication effect. In addition, reasonable adjustment of molding temperature, pressure and cooling speed can also effectively reduce the risk of mold sticking and avoid adhesion problems caused by overheating or overcooling of the mold surface.