The selection of inspection fixtures should be based on the shape and size of the workpiece; for example, select a suitable fixture for a square workpiece.
Inspect the fixture for any external damage, such as wear or deformation of the grippers. New fixtures must undergo accuracy testing before use; deviations must be within the specified range. Ensure the fixture is securely installed on the equipment, and that the bolt tightening torque is standardized. For large fixtures, multiple people should work together to ensure accurate installation. After installation, adjust the clamping force; different workpieces require different amounts. During adjustment, observe the fixture's movement for smoothness and any abnormal noises or jamming. Clean the fixture surface and locating surfaces to prevent debris from affecting clamping accuracy. Before clamping the workpiece, determine the correct positioning datum to ensure machining accuracy.
Workpieces should be placed stably during clamping, avoiding tilting or suspension. Control the clamping force carefully during clamping; excessive force can deform and damage the workpiece. The clamping force should be evenly distributed to prevent excessive localized stress on the workpiece. Thin-walled workpieces require special handling, using soft materials for protection. After clamping, double-check the workpiece position to ensure it meets machining requirements. Monitor the fixture's condition during machining; stop the machine immediately if any loosening occurs. For long-term machining, periodically check the fixture's accuracy and adjust as needed. If abnormal vibration of the fixture is detected during machining, stop operation immediately. Select appropriate jaw materials for clamping workpieces of different materials. For precision machining fixtures, perform regular precision calibration and maintenance.
When using inspection fixtures in high-temperature environments, their thermal stability must be considered. Fixtures should be cleaned promptly after use to remove chips, oil, and other impurities. Appropriate tools should be used during cleaning to avoid damaging the fixture surface. After cleaning, apply rust-preventive oil to critical parts of the fixture to prevent rusting. Fixtures should be stored in a dry, well-ventilated place to prevent moisture and rust. Large fixtures should be properly supported to prevent deformation and damage. Fix fixtures of different sizes for easy retrieval and use. Fixtures should be clearly labeled with their specifications, model, and purpose. Regularly conduct inventory checks to confirm the completeness of stored fixtures. Unused fixtures must be thoroughly inspected before reuse; only those that pass inspection can be used.
Regularly inspect vulnerable parts of inspection fixtures and replace them promptly if wear exceeds limits. Choose reliable brands when purchasing inspection fixtures to ensure performance. Inspect newly delivered inspection fixtures to verify specifications and parameters. Personnel using inspection fixtures must undergo professional training and master operating procedures. Operators must strictly follow procedures and avoid violations. Maintain a usage record form for inspection fixtures, documenting usage and maintenance information. Record inspection fixture malfunctions in detail, analyze causes, and develop countermeasures. Report fixture malfunctions promptly and never operate a malfunctioning fixture. Test repaired inspection fixtures before use. Conduct regular performance evaluations of inspection fixtures for optimization and improvement. Establish fixture files, recording the entire process from purchase to disposal.
Strictly adhere to the above inspection fixture usage procedures and precautions. Ensure fixtures serve production and processing safely, efficiently, and accurately.
