There are many names for bolts. Each person's name may be different. Some people call them screws. Some people call them bolt nails. Some people call them standard parts, and some people call them fasteners. Although there are so many names, the meanings are the same. They are all bolts. Bolts are a common term for fasteners. The principle of the bolt is to use the physics and mathematics principle of the object's bevel circular rotation and friction, and gradually fasten the tools of the artifact mechanism. Bolts are indispensable in everyday life and industrial manufacturing. Bolts are also called industrial rice. Extensive use of visible screws. Bolt scope of application are: electronic products, machinery products, digital products, electrical equipment, machinery and electrical machinery products. Ships, vehicles, hydraulic engineering, and even chemistry experiment is also useful to bolt. Anyway, over many places have used bolt. Special digital products such as precision bolts used above. DVD, camera, glasses, watches, electronics and other micro-bolts to use; TV, electrical products, musical instruments, furniture, etc. Generally bolt; as for engineering, construction, bridge, use large bolts, nuts; transportation equipment, aircraft, train, car Etc. are used for size bolts. Bolts have an important mission in the industry. As long as there is industry on the earth, the function of bolts is always important.
Bolt detection
Bolt detection is divided into two types: manual and machine. Labor is the most primitive and most commonly used consistent detection method. In order to minimize the outflow of defective products, general production company personnel conduct inspections by visually treating the packaged or shipped products to eliminate defective products (bad including dental injuries, mixed materials, rust, etc.).
Another way is automatic detection of the machine, mainly magnetic particle inspection.
Magnetic particle flaw detection is the use of the interaction between the leakage magnetic field at the bolt defect and the magnetic powder, and the magnetic permeability and the permeability of the steel against the possible defects of the bolt (such as crack, slag inclusion, mixing, etc.). These materials are discontinuous after magnetization. The magnetic field at the place will undergo a catastrophic change, forming a leakage magnetic field at the part of the magnetic flux leaking at the surface of the work piece, thereby attracting the magnetic powder to form a magnetic powder accumulation at the defect—a magnetic mark, and under proper lighting conditions, the position and shape of the defect will be revealed. The accumulation of these magnetic particles is observed and explained, and the purpose of rejecting defective products has been achieved.