There are two kinds of screw surface inspection, one is the inspection before the plating of screws after production, the other is the inspection after the plating of screws, that is to say, the inspection after the hardening of screws and the treatment of screws surface. After the screws are produced and before plating, we check the dimensions, tolerances and other aspects of the screws. See if it meets national standards or customer requirements. After the surface treatment of screws, we have plated the good screws for inspection, mainly to check the color of plating and whether there is a bad screw, etc. In this way, when we send screw goods to customers, customers can successfully pass the customs when receiving goods. Inspection after screw treatment:
First, appearance quality requirements
The appearance of the screw is inspected from the appearance, electroplating and other aspects.
Two, screw coating thickness inspection
1, measuring tool method
The dosage has 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 meter.
3. Microscope method
The microscope method is called metallographic method, which is to measure the thickness of the coating on the section by enlarging the etched fastener on a metallographic microscope with a micromeasuring eyepiece.
4. Timed liquid flow method
The timed liquid flow method is used to make the solution of the coating dissolved on the local surface of the coating, according to the time required for the local coating to dissolve, to calculate the thickness of the coating. There are coating drop method, anode dissolved Coulomb method.
These methods are to test the screw, if you need to welcome the call!
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