Today, Xiaobian shares the basic knowledge of a screw. Screws are one of the essential parts in daily life. What basic knowledge do we need to know? Let's take a look at it together. First, the relevant terms of the screw 1, the difference between screws, nuts, nuts, bolts, screws, studs: the standard is that there are no screws and nuts. Screws are commonly known as "screws" with external threads. 2. The shape of the nut is usually hexagonal, and the inner hole is internal thread. It is used to match the bolt and close the relevant parts. The nut is a common name and the standard should be called "nut". 3. The head of the bolt is generally hexagonal and the stem has external threads. The screw is small, the head has a flat head, a crosshead, etc., and the stem has external threads. 4, the stud should be called "double stud", both ends have external threads, the middle is usually a polished rod. The long end of the thread is used to connect to the deep hole and the short one is connected to the nut. 5. Common English expression: Screw / Bolt / Fastener (screw / screw) (bolt) (fastener) 6. Definition of Thread: Thread is a shape with a uniform spiral on the outer or inner surface of the solid. Second, the role of thread 1. Fastening and connection: Suitable for most screw products at this stage. 2, transmission (displacement effect): such as QC check the size of the micrometer. 3, sealing effect: such as the connection and sealing of the pipeline. Third, the history of the development of thread Machine thread: Before assembly, the hole is drilled and tapped on the assembly. The inner teeth of the tapped teeth are the same as the outer teeth of the screw, and assembled with a small torque. Self-tapping thread: Drill holes in the assembly before assembly, without the need to tap the inner teeth, assemble with a large torque. Self-drilling thread: Used directly on the assembly, the screw drilling and tapping is formed once. Fourth, the way of processing screws 1. Turning, the material is brought to the desired shape by removing the material. Advantages: high processing precision, no mold limitation; insufficient: high production cost and slow processing speed. 2. Forging, which is deformed by external force to achieve the desired shape. Advantages: fast production speed, low cost, suitable for mass production; insufficient: forming is limited by mold, and the cost of mold for complex products is high. 3. Cold heading: It is a process in which the metal wire is not heated, and the mold is pressed and deformed by means of an external force. The cold heading process is only one type of forging process. Five, the basic configuration of the screw To understand screw bolts, you must first know their type, characteristics and functions: A: drive system B: head C: tooth joint joint D: Import and Attack Department Mechanical tooth screw Self-tapping screw Screw head type Screw tooth type The above is what today is. Aluminum Coil is a kind of mental product which is disposed rolling and bengding angle. Aluminum coil is widly used.The alloys are 1seiries, 3series, 5series and 8series.The thickness of the Aluminium Coil is from 0.2mm to 200mm.The width are from 500mm to 2200mm.The internal diameters are 508mm,405mm,305mm,150mm and 75mm. We can also produce aluminium products according to customers' verious special demands.The aluminium coil is used in package,electronic products, machinery,buildings and so on. Aluminum Coil Aluminum Coil,Mill Finish Aluminum Coil,Aluminum Coil For Roofing,Prepainted Aluminium Coil Henan Everwin Trade Co., Ltd. , https://www.ewaluminium.com
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