The surface inspection of Hexagon Flange Bolt is divided into two types, one is the inspection after the screw is produced without electroplating, and the other is the inspection after the screw is electroplated, that is to say, the inspection after the screw is hardened and the surface of the screw is processed. . After the screws are produced, before they are plated, we inspect the dimensions and tolerances of the screws. See if it meets national standards or customer requirements. After the surface treatment of the screws, the electroplated screws are inspected, mainly to inspect the color of the electroplating and whether there are broken screws. In this way, when we deliver the screws to the customer, the customer can pass the customs smoothly when the customer receives the goods. Inspection after screw processing:
1. Appearance quality requirements
The appearance of screws is inspected from the appearance, plating layer and other aspects.
Second, the inspection of the thickness of the screw coating
1. Measuring tool method
The amount used includes micrometer, vernier caliper, plug gauge and so on.
2. Magnetic method
The magnetic method to measure the thickness of the coating layer is a non-destructive measurement of the non-magnetic coating layer on the magnetic substrate with a magnetic thickness gauge.
3. Microscopy
The microscopy method is called the metallographic method, which is to magnify the etched fasteners on a metallographic microscope with a micrometer eyepiece to measure the thickness of the coating on the section.
4. Timing sap flow method
The Threaded Rods And Eye Bolts timing liquid flow method uses a solution that can dissolve the coating to flow onto the partial surface of the coating, and calculate the thickness of the coating according to the time required for the partial coating to dissolve. There are also plating spot method, anode dissolution coulometric method and so on.