Accurately identifying the causes of failure requires a multi-dimensional analysis. The key steps are as follows:
1. Macroscopic Morphology Analysis
First, observe the appearance of the failed
Medical Equipment Micro Screws, recording the failure location (e.g., cutting edges, fillets, cavities) and failure mode (wear, cracks, deformation). For example: The direction of wear marks can determine the direction of friction; The initiation point and direction of cracks can infer the location of stress concentration (e.g., a crack starting at a fillet may indicate a design flaw); The degree of plastic deformation can preliminarily determine the load magnitude or material strength.
2. Microstructure Inspection
Use a metallographic microscope to observe the microstructure changes of the Medical Equipment
Micro Screws material: The microscopic fracture surface of fatigue fracture usually has clear fatigue striations, confirming fatigue failure; Abrasive marks on the wear surface can determine the wear type (e.g., abrasive wear, adhesive wear); Check for heat treatment defects such as decarburization layers, coarse grains, and abnormal martensite structure.
3. Mechanical Property Verification: Hardness tests (Rockwell hardness, Vickers hardness) are used to check if the surface hardness of the Medical Equipment Micro Screws meets design requirements; impact tests are used to evaluate the material's toughness (e.g., low impact toughness can lead to chipping); tensile tests are used to verify the material's yield strength and tensile strength.
4. Process Parameter Retrospective Analysis: Key parameters in the production process are analyzed: Stability of tensile pressure and speed; Type, dosage, and replacement frequency of lubricant; Whether the thickness and hardness of the workpiece material meet requirements; Equipment accuracy and debugging status (e.g., centering accuracy).
