Revealing the core technology of high-performance injection molds
Publish Time: 2025-04-05
In today's era of booming manufacturing, high-performance injection molds are the core equipment for the production of plastic products. Their performance and quality directly affect the quality and production efficiency of the final product. In-depth analysis of the core technology of high-performance injection molds is of vital importance to promoting the innovative development of the plastic products industry.Mold design: Laying the foundation for high performanceMold design is the soul of high-performance injection molds, and many factors need to be considered comprehensively. The mold structure is carefully conceived based on factors such as product geometry, wall thickness, demoulding slope, and gate position. Taking the design of automobile bumper molds as an example, the bumper has a complex shape and large size. It is necessary to design a reasonable parting surface to ensure smooth opening and closing of the mold. At the same time, the gate position must be accurately determined to ensure that the plastic melt can fill the cavity evenly and quickly.The design of the cooling system is also extremely critical. It plays a decisive role in controlling the cooling rate of plastic parts and shortening the molding cycle. Designers should carefully layout the cooling water channel to ensure uniform cooling, avoid warping or internal stress in plastic parts, and ensure the dimensional stability and appearance quality of the product. Reasonable cooling system design can make the molded plastic products demold after reaching a certain rigidity, thus avoiding deformation under external force.Material selection: guarantee mold performanceThe selection of mold materials needs to comprehensively consider wear resistance, corrosion resistance and thermal stability. Commonly used materials include steel, aluminum alloy and copper alloy. Different materials vary in cost, processing difficulty and service life. For example, for products with large production batches and high requirements for mold life, high-hardness and high-wear-resistant mold steels such as H13 and S136 are usually selected. This kind of steel can withstand high-intensity production pressure, reduce mold wear and extend the service life of the mold.For some small molds with low precision requirements, aluminum alloy may be a good choice. It has the advantages of light weight and easy processing, which can reduce the manufacturing cost of the mold to a certain extent.Processing and manufacturing: achieve high-precision moldingModern mold processing technologies such as CNC milling, EDM and laser cutting provide strong support for high-precision mold manufacturing. In the rough machining stage, most of the excess is removed by cutting and other methods to lay the foundation for the subsequent finishing. In the finishing stage, the mold parts must be processed to the dimensional accuracy and surface roughness required by the design. For example, EDM is often used to process those complex-shaped cavities, which can meet the strict accuracy requirements of high-performance injection molds.The heat treatment link should not be ignored. It can improve the hardness, strength and other properties of mold parts and make the mold more durable. For example, after proper heat treatment, the hardness and wear resistance of mold steel will be significantly improved, and it can better withstand the high pressure and friction during the injection molding process.Surface treatment: improving mold qualityThe treatment of the mold surface is crucial to improving the wear resistance, corrosion resistance and demolding performance of the mold. Common surface treatment technologies include plating, spraying and polishing. Polishing can make the mold surface achieve a high degree of finish, reduce the flow resistance of the plastic melt on the mold surface, facilitate the demolding of plastic products, and improve the surface quality of the products.Controlling the Ra value of the mold surface roughness also has a direct impact on optimizing the appearance quality of plastic parts and reducing demolding resistance. Generally speaking, the smaller the surface roughness, the better the surface quality of the plastic product and the easier it is to demold.Testing and verification: ensuring mold stabilityAfter the mold is processed, it must undergo a series of rigorous tests to verify its various functions and performances. These tests cover multiple aspects such as the mold's filling capacity, cooling efficiency, and ejection function. Through mold trial and subsequent optimization, problems in mold design and processing can be discovered and solved in a timely manner, thereby ensuring the stability and reliability of the mold.For example, during the mold trial, if it is found that the plastic product has problems such as insufficient filling and air marks on the surface, it is necessary to adjust and optimize the mold's pouring system, exhaust system, etc. until a plastic product that meets the requirements is produced.The core process of high-performance injection molds is a complex and systematic project involving mold design, material selection, processing and manufacturing, surface treatment, testing and verification, and other links. Only by striving for excellence in each link can high-performance injection molds be created, providing strong support for the development of the plastic products industry.
