First, the classification and characteristics of screws
There are many different types of screws in production and use, which can be divided into the following categories according to different characteristics and uses:
1. Wood screws: mainly used to fix objects in wood to avoid cracks and other problems on wood. Generally, a straight or cross head is used, and special head design can also be carried out according to needs.
2. Metal screws: In use, it is necessary to select the material according to the fixed material. For example, copper screws are used to fix circuit boards or electrical appliances, because copper has good electrical conductivity; Stainless steel screws are used to fix external wall mounting materials, etc., because stainless steel has corrosion resistance.
3. Machine screws: usually made of carbon steel, used for the connection and fixing of the machine.
Second, screw selection requirements
When choosing screws, the following aspects should be considered:
1. Material: Choose screws that are the same or harder than the fixed material to ensure stable fixing.
2. Head type: Select materials according to the needs of decoration, such as button head fixing is to lock a board on the wood, countersunk screws can be embedded in the material, and the surface is flush with the surface of the material.
3. Diameter and length: should be selected according to the size of the fixed body and the thickness of the material. Choosing too large screws will make the material fragile and easy to break, and choosing too small will make the fixing unstable.
Three, the basic requirements of screw use
The following requirements should be noted when using screws:
1. Use the right screwdriver to ensure the correct control of the force, and there will be no sliding or jamming.
2. Adding a certain degree of lubricant can reduce the loss caused by friction.
3. After fixing the screws, they should be checked for firmness, which can be tested using force detection tools to ensure the safety of fixing.
In short, it is very important to choose screws that are suitable for different places. Choose according to different materials, and take the most appropriate fixing method to ensure safe fixing.
