1. According to the force bearing mode of the connection: divided into ordinary and hinged holes.
2. According to the shape of the head: there are hexagonal head, round head, square head, countersunk head and so on. Among them, the hexagonal head is the most commonly used. Generally, countersunk heads are used where connections are required.
3. According to the tooth type of the thread, it is divided into two types: coarse tooth and fine tooth. The coarse tooth type is not displayed in the logo of the bolt.
4. Ordinary bolts can be divided into three grades: A, B, and C according to the manufacturing accuracy. Grades A and B are refined bolts, and grade C is rough bolts.
Function: Used to fasten two parts with through holes. It is a tool that uses the physical and mathematical principles of the oblique circular rotation and friction of the object to tighten the device parts step by step.
Extended information
Bolt detection
There are two types of bolt detection: manual and machine. Manual is the most primitive and most commonly used consistent detection method. In order to minimize the outflow of defective products, the personnel of the general production enterprise visually inspect the packaged or shipped products to eliminate defective products (defects include tooth damage, mixed materials, rust, etc.).
Another way is fully automatic inspection by machine, mainly magnetic particle inspection. Magnetic particle flaw detection is to use the interaction between the leakage magnetic field at the defect of the bolt and the magnetic powder, aiming at the difference between the magnetic permeability of the possible defects of the bolt (such as cracks, slag inclusions, mixed materials, etc.) and the magnetic permeability of steel. After magnetization, these materials are discontinuous The magnetic field at the place will change,
Leakage magnetic field is generated on the surface of the workpiece where part of the magnetic flux leakage is formed, thereby attracting magnetic powder to form magnetic powder accumulation at the defect-magnetic marks, under appropriate lighting conditions, showing the position and shape of the defect, and observing and explaining the accumulation of these magnetic particles , has achieved the purpose of eliminating defective products.
Classification and function of bolts
2023 01/31