1. Related terms of screws
●The difference between screws, screws, bolts and fasteners.
●Common English expressions: Screw; Bolt; Fastener.
● Definition of thread: Thread is a shape with a uniform spiral protrusion on the outer or inner surface of a solid.
2. The role of thread
●Tightening and connection: suitable for most screw products at this stage.
●Transmission function (displacement effect): such as a micrometer for QC to check the size.
●Sealing effect: such as the connection sealing of the pipeline.
3. Processing method of screws
●Turning: Turn the material to the desired shape by removing the material.
Advantages: high processing accuracy, no mold restrictions.
Insufficient: high production cost and slow processing speed.
●Forging: Forging material by external force to deform it to achieve the desired shape.
Advantages: fast production speed, low cost, suitable for mass production.
Insufficient: The forming is limited by the mold, and the mold cost of complex products is high.
4. Cold heading process
●Cold heading: It is the process of squeezing and deforming the metal wire rod by external force without heating the metal wire.
●The cold heading process is only one type of forging process.
5. Commonly used raw materials for manufacturing screws
●Metal and non-metal.
●Metal: iron Fe, copper Cu, aluminum AI.
● Iron: Carbon Steel, Alloy Steel, Stainless Steel.
●The form of raw materials (wire and bar).
●Processing technology of raw materials.
●Current sources of metal materials: Japan/Korea, Taiwan, Mainland China.