Industrial plastic parts that are subjected to long-term pressure should avoid deformation or cracking. First of all, we need to start with material selection. Different plastics have significant differences in creep resistance. Materials with good pressure resistance should be preferred, such as reinforced nylon and polycarbonate. Under continuous pressure, the molecular structure of these materials is more stable and not prone to slow deformation. At the same time, according to the pressure and environmental conditions, reinforced plastics with glass fiber or carbon fiber can be selected to improve the overall anti-deformation ability through the support of the fiber, reducing the risk of cracking from the source.
Reasonable structural design is crucial to the pressure resistance of industrial plastic parts. The stress-bearing parts of industrial plastic parts should avoid sharp angles or sudden changes in thickness. These places are prone to stress concentration and cracks appear first under long-term pressure. The rounded corner transition method can be used to disperse the stress in a larger range, while appropriately increasing the thickness of the stress-bearing surface, or designing a reinforcing rib structure to enhance local strength. For industrial plastic parts with holes, the area around the holes should be thickened to prevent the edges of the holes from becoming weak points and ensure that the pressure can be evenly transmitted to the entire industrial plastic parts.
The control of the processing technology directly affects the intrinsic quality of industrial plastic parts. During injection molding, it is necessary to ensure that the plastic melt fully fills the mold cavity to avoid bubbles or looseness inside due to lack of material. These defects will become the starting point of cracking under pressure. During the cooling process, the cooling rate should be controlled to prevent the internal stress of the industrial plastic parts due to uneven cooling. When the internal stress accumulates to a certain extent, it will cause deformation or cracking under long-term pressure. If necessary, the molded industrial plastic parts can be annealed to release internal stress and improve dimensional stability.
The temperature and humidity of the use environment need to be strictly controlled. The mechanical properties of most plastics will change with temperature. High temperature will soften the plastic, reduce its pressure resistance, and make it more easily deformed under long-term pressure; while low temperature may cause the plastic to become brittle, reduce toughness, and increase the risk of cracking. At the same time, a humid environment may cause some plastics to hydrolyze, destroy the molecular structure, and weaken the strength. Therefore, according to the material characteristics of industrial plastic parts, the temperature and humidity of the use environment should be controlled within a suitable range to avoid extreme conditions that accelerate the failure of industrial plastic parts.
Regular maintenance and inspection are the key to extending the life of industrial plastic parts. During long-term use, dirt and impurities on the surface of industrial plastic parts should be cleaned regularly to prevent impurities from causing wear on the surface of industrial plastic parts under pressure, thereby causing stress concentration. At the same time, observe whether industrial plastic parts have slight deformation or cracks. If early damage is found, take repair measures in time, such as using special glue to repair small cracks, or replace unevenly stressed parts to prevent damage from expanding under continuous pressure.
The matching accuracy during the assembly process will also affect the pressure resistance of industrial plastic parts. When industrial plastic parts are connected with other components, the matching clearance should be reasonable to avoid interference fit, which will cause pre-tightening stress in industrial plastic parts during assembly. After superimposing the pressure during work, it is easy to exceed the bearing limit of the material. Elastic gaskets or buffer structures can be used at the connection parts to reduce the additional stress transmitted by other industrial plastic parts, ensure that industrial plastic parts only bear the pressure within the design range, and avoid deformation or cracking due to additional force.
Regular performance testing of industrial plastic parts helps to find problems in advance. Through pressure resistance tests simulating actual working conditions, the deformation of industrial plastic parts under continuous pressure is observed and their remaining service life is evaluated. If obvious creep or tiny cracks are found in industrial plastic parts, they should be replaced in time even if they have not affected normal work, to avoid sudden failure under critical working conditions. At the same time, according to the test results, the stress characteristics of industrial plastic parts during use are summarized to provide a basis for subsequent design improvements and continuously optimize the pressure resistance of industrial plastic parts.
