Optimizing injection speed control of injection molding machines: a key strategy to avoid defects
In today’s competitive manufacturing market, product quality is one of the key factors for business success. Injection molding is a kind of processing method widely used in the production of various plastic products, and its production efficiency and product quality are directly related to the profitability and market competitiveness of enterprises. In the process of injection molding, the control of injection speed plays a vital role in ensuring product quality and avoiding defects. We will explore in depth how to optimize the injection molding process by setting the appropriate injection speed, in order to provide valuable reference and guidance for enterprises.
First, the impact of injection speed on product quality
The injection speed of the injection molding machine refers to the speed at which the screw advances and the molten plastic is injected into the mold. This speed has a direct impact on product quality. If the injection speed is too fast, the flow of plastic melt in the mold cavity will become unstable, which will easily lead to defects such as short shot, bubble, burning, etc. If the injection speed is too slow, the plastic melt in the mold cavity cooling time is too long, will lead to product shrinkage, deformation and other defects. Therefore, setting the right injection speed is crucial to avoid these defects.
Second, how to set the appropriate injection speed
1、Set the injection speed according to the product structure and material characteristics
Different product structures and material properties require different injection speeds. Generally speaking, for thin-walled products with complex shapes, a higher injection speed is required to ensure that the plastic melt can fully fill the mold cavity; For products with thick walls and simple shapes, the injection speed can be appropriately reduced to avoid defects such as bubbles and burning. In addition, the fluidity of different materials is also different, and the injection speed needs to be adjusted according to the actual situation.
2、Set injection speed according to mold temperature and melt temperature
Mold temperature and melt temperature are also important factors affecting the injection speed. Generally speaking, the higher the mold temperature, the better the fluidity of the plastic melt, and the injection speed can be appropriately increased; The higher the melt temperature, the lower the viscosity of the plastic melt, and it is also necessary to appropriately increase the injection speed to ensure that the melt can fully fill the mold cavity. However, too high mold temperature and melt temperature can also easily lead to product shrinkage, deformation and other defects, so it is necessary to set the injection speed reasonably under the premise of ensuring product quality.
3、Set the injection speed according to injection pressure and holding pressure
Injection pressure and holding pressure are also important factors affecting injection speed. Generally speaking, the higher the injection pressure, the faster the flow speed of the plastic melt in the mold cavity, and the injection speed can be appropriately reduced to avoid defects such as bubbles and burning; The higher the holding pressure, the longer the cooling time of the plastic melt in the mold cavity, and the injection speed needs to be appropriately reduced to avoid defects such as shrinkage and deformation of the product. Therefore, it is necessary to reasonably set the injection pressure and holding pressure as well as the matching injection speed under the premise of ensuring product quality.
Third,Practice cases of optimizing injection speed control
Taking a plastic products factory as an example, some defects such as bubbles and burning were found in the production process of the factory. After analysis, they found that the root of the problem was improper control of injection speed. Therefore, the technicians of the factory re-set the injection speed according to the factors such as product structure and material characteristics, mold temperature and melt temperature, injection pressure and pressure holding pressure, and carried out many tests and adjustments. In the end, they successfully solved the product quality problem and improved the production efficiency and product quality level.
Fouth,Conclusion and Prospect
It can be seen from the discussion in this paper that setting an appropriate injection speed is very important to avoid defects in the injection molding process. In the actual production process, the enterprise should set the appropriate injection speed according to the comprehensive consideration of product structure, material characteristics, mold temperature and melt temperature, injection pressure and pressure holding pressure. At the same time, enterprises should also continue to explore and practice new technologies and methods to optimize the injection molding process to improve product quality and production efficiency. Looking forward to the future, with the continuous development and progress of science and technology, we believe that we will have more new technologies and methods to optimize the injection molding process to inject new vitality and momentum into the development of manufacturing.
