Screw is a tool to fasten the objects and parts step by step by using the physics and mathematical principles of the object's oblique circular rotation and friction force. Screw is a common term for fastener. Screws are indispensable industrial necessities in daily life: such as cameras, glasses, clocks, electronic and other small screws; General screws for television, electrical products, musical instruments, furniture, etc; As for engineering, construction and bridge, large screws and nuts are used; Transportation equipment, aircraft, tramcar, automobile, etc. are used together with screws of size. Screws have an important task in industry. As long as there is industry on the earth, the function of screws is always important. Screw is a common invention in people's production and life for thousands of years. According to the application field, it is the first invention of human beings.
Non standard screw refers to the screw manufactured according to the unified industrial standards and specifications promulgated by the state, but designed and manufactured by itself according to its own use needs. The specification adopted by non-standard screws is not within the national standard, and the appearance or performance is not in the national equipment product catalog, and it is special size, and is generally used in the application of less parts!
Non standard screw processing process:
Non standard screw is an nonstandard screw. It appears because some machines or household appliances are used on it, and it is different from the ordinary screw processing process. Many non-standard screws can not be directly driven out by screw machines. They must be processed by lathe, machine tool and other machines, so the processing process will be much more than the general screws. Of course, after the non-standard screw is processed, its electroplating method is similar to that of ordinary plating.
Common screw processing process:
Equipped with standard die and heavy head, the machine can be directly made, the processing process is relatively simple, if there are mold and punch, the direct feeding can be punched out, then the wire rubbing and electroplating, and can be delivered after finishing.
Screw is used in many industries in our life, the main function is to connect two pieces together, play a role of fastening! Non standard screws occupy most of them, while ordinary screws occupy a small part!
