Testing the quality of injection molding precision parts is a key step to ensure product performance, stability and reliability. The following is a detailed explanation of the quality inspection of injection molding precision parts, covering the main inspection methods and key points:
1. Dimensional accuracy measurement
Method: Use precision measuring tools such as calipers, micrometers, height gauges, projectors, etc. to accurately measure the dimensions of injection molded parts.
Key points: Ensure that the main dimensions of the parts meet the requirements of the design drawings and the tolerance range meets the enterprise standard or industry standard.
2. Appearance quality inspection
Method: Visual inspection, hand touch, magnifying glass observation, etc.
Key points: The surface of the part should be smooth and flat, without defects such as scratches, dents, pores, impurities, etc. The edges should be cut neatly and without burrs. Pay special attention to checking whether the injection molded parts have common defects such as shrinkage and weld marks.
3. Material performance testing
Method: Tensile test, impact test, hardness test, heat deformation temperature test, etc.
Key points: Ensure that the performance of the injection molding material meets the design requirements, such as strength, hardness, toughness, thermal stability, etc. In addition, the quality of raw materials, such as color, impurities, etc., also needs to be tested.
4. Polarized lens detection method
Method: Use a polarized lens to detect the internal stress of transparent parts (such as PC parts).
Key points: Observe the sample through a polarized lens. The parts with stress are bright white, and the parts without stress are black. This method can help determine the stress concentration problems inside the product, the crystallinity problems of the plastic, and the molecular orientation problems.
5. Environmental protection test
Method: Detect the heavy metal content and plastic composition of the parts.
Key points: Ensure that the injection molded parts comply with relevant national environmental protection regulations and standards to avoid negative impacts on humans or the environment.
The quality of injection molding precision parts needs to be tested from multiple aspects, including dimensional accuracy, appearance quality, material properties, internal stress, and environmental protection. By adopting appropriate testing methods and tools, it can be ensured that the quality of injection molded parts meets the design requirements and usage standards, providing a strong guarantee for the stability and reliability of the product.
