Screws Classification and Quality Inspection Method

25/set/2019 12:04:06 fifa 19 Contatta l'autore

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Screws are a common fastener that is widely used in machinery, appliances, and buildings. Screws can be divided into the following types according to their names:

Machine screws, self-tapping screws, wallboard nails, fiberboard nails, wood screws, hexagonal wood screws, non-leaving screws, combination screws, micro screws, furniture screws, electronic screws


According to the head type, they can be divided into :

1. hexagon head 2. hexagon head with flange 3. square head 4. T head (hammerhead) 5. mushroom head(truss head) 6. The head of the neck 7. The round head 8. The pan head 9. The countersunk head (flat head) 10. The semi-sunk head raised countersunk head (oval)


According to the groove type, they can be divided into:

1. One word 2. Inner triangle 3. Inner corner Quartet 4. Cross 5. Rice word 6. Flower shape 7. Plum shape 8. Flower shape 9. Special shape 10. Hexagon. provides a variety of screws applied for different industries, the product will be manufactured according to the customers requirements. 


How to perform quality inspection on screws?

First of all, the screw detection should start from the wire of the screw. The quality of the precision screw is directly related to the wire that produces the screw. The screws that open the good screws and wires are more beautiful. What screw head burst, what thread is not good. Good screw wire will generally not find this situation.


The second is the detection of the head forming of the screw. In the forming of the screw, the mold of the production screw is first detected. Have a good mold to make a good screw product. It is the machine inspection of the production screws, which is conducive to safe and smooth production. The shape of the formed screw is checked to see if there is any burr, and the length of the forming screw is detected. See if these size lengths meet the national standard or the specific requirements of the customer.


The third is the detection of the screw fangs. Of course, the screw is the first to be the tooth plate. Good teeth should be able to pass the stop gauge. Pass the rules and regulations. There is also the detection of the thread pitch of the teeth. It must also meet the national standards for screws or customer requirements.


Finally, the color of the plated screws and the salt spray test are tested. Look at the color of the screws that are plated back. How smooth is the surface of the screw? The salt spray test will detect the rust time of the screw or the number of hours of salt spray screw will rust. After that, the screw shipment was tested. The method is to pick out the unqualified screws. Give the best quality screws to the customer. Guarantee the quality of the screws.

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