High quality bolt products will undergo testing and verification, and only after testing and verification can the unqualified parts of the product be detected, so as to better improve it. Only in this way can we provide customers with high-quality products and win the favor of users! What verification tests are typically conducted for high-quality screws? The test items for high-quality screws include requirements for appearance, size, performance, purity, etc. What inspection tools are required?
Appearance inspection is generally visual, and color card comparison is required if there are color requirements. The size can be inspected with micrometer, plug gauge, vernier caliper, anime, projector, height gauge, depth gauge and other inspection tools. The thickness of the coating layer is a non-destructive measurement of the non magnetic coating layer on a magnetic substrate using a magnetic thickness gauge. Microscopic method, also known as metallographic method, is to magnify the etched fastener on a metallographic microscope with a micrometer eyepiece to measure the thickness of the plating layer on the section. The timed liquid flow method uses a solution that can dissolve the coating to flow onto a local surface of the coating, and calculates the thickness of the coating based on the time required for the local coating to dissolve. There are also plating droplet method, anode dissolution coulomb method, and so on.
The inspection of the adhesion strength of screw plating is to evaluate the adhesion between the plating layer and the base metal. There are many methods, usually the following: friction polishing test, file method test, scratch method, bending test, thermal shock test, and extrusion method. There are several methods for testing the corrosion resistance of high-quality screw coatings. The methods for testing the corrosion resistance of coatings include atmospheric explosion test, neutral salt spray test (NSS test), acetate spray test (ASS test), copper accelerated acetate spray test (CASS test), corrosion paste corrosion test (CORR test), solution drop corrosion test, immersion test, and immersion corrosion test. The best plan for selecting debris is to use a CCD optical separator for full inspection.
In short, the inspection of high-quality screws should be comprehensive and detailed, which is the only way to ensure the qualified rate of the product. Of course, the specific requirements and use environment depend on the product. After all, excessive testing can directly lead to increased costs and easily lead to excessive quality.