The Four Characteristics of Precision Injection Mold Processing and the Main Factors Influencing Mold Processing Accuracy
The most important aspect of precision mold processing is precision, so the size requirements for the workpiece are very high, with errors around+-0.005. Moreover, many precision molds cannot have slopes during production. It is precisely because of the operability and controllability during processing that the entire process can proceed smoothly. Below, we will explain the characteristics of precision mold processing.
1. When wear-resistant raw materials undergo plastic deformation in the concave mold of an injection mold, they circulate and roll along the surface of the mold cavity, causing severe friction between the mold cavity surface and the blank, thereby rendering the grinding tool ineffective due to damage. Therefore, the corrosion resistance of materials is one of the most fundamental and important characteristics of molds. The strength of precision mold processing is the main factor affecting wear resistance. Generally speaking, the higher the strength of mold parts, the lower the wear rate, and the higher the wear resistance. In addition, wear resistance is also related to the type, total amount, shape, size, and distribution of carbides in the material.
2. Strong ductility. Most mold shell operation standards are extremely extreme, and some often withstand large impact loads, which can lead to brittle fracture. In order to avoid sudden brittle fracture of mold parts during operation, high-precision metal molds must have high hardness and ductility. The key to the ductility of precision mold processing is the carbon content, grain size, and structure of the raw materials – precision mold manufacturing.
3. Fatigue cracking characteristics: Fatigue fracture is usually caused by the long-term effect of cyclic stress in the working part of the mold, and its types include small kinetic energy repeated impact fatigue fracture. The key to the fatigue cracking characteristics of the mold shell is its compressive strength, ductility, strength, and the composition of impurities in its raw materials.
4. When the working temperature of the mold shell is high, the strength and hardness will decrease, leading to initial damage or plastic deformation failure of the mold shell. Therefore, precision hardware mold steel should have high quenching resistance reliability to ensure that the mold shell has high strength and compressive strength at room temperature.
The Four Characteristics of Precision Injection Mold Processing and the Main Factors Influencing Mold Processing Accuracy
Mold processing designers must have rich experience in design and injection molding. For precision mold processing, it is necessary to consider the relationship between these factors and injection molding conditions and their apparent factors, such as injection pressure, cavity pressure and filling speed, injection melt temperature and mold temperature, mold structure and gate type and distribution, and discuss the effects of gate area, wall thickness, filler content in plastic, plastic crystallinity and orientation.
The influence of the above factors also varies with plastic materials or other molding conditions such as temperature, humidity, continuous crystallization, and molding machines. In the study of technical factors affecting mold processing, molds are the key to obtaining precision plastic products that better meet the requirements of teaching quality management. The design of molds and the rationality of mold structure design enterprises will directly affect the quality of plastic products.
Because the injection molding process is the transformation of plastic from solid (powder or particles) to liquid (melt) to solid (product). Precision mold processing, from particles to melt, and then from melt to product, through the effects of temperature, flow field, and density field in the middle. Under the joint action of these fields, different plastics (thermosetting or thermoplastic, crystalline or amorphous, reinforced or non reinforced, etc.) are formed.
Having different polymer structures and rheological properties. All factors that affect the above “field” will definitely affect the physical and mechanical properties, size, shape, accuracy, and appearance quality of plastic products. Due to process factors, polymers, structural morphology, and the combination of plastic materials, the finished mold can be displayed. As long as the mold processing master can familiarize themselves with the previous connections of these materials and add specific processing techniques and drawings, a mold can be made.
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