DIN 933 bolt inspection is divided into manual and ma […]
DIN 933 bolt inspection is divided into manual and machine. Manual is the most primitive and most commonly used consistent detection method. To reduce the outflow of defective products as much as possible, the general production personnel inspects the packaged or shipped products visually to eliminate defective products (defectives include dental injuries, mixed materials, rust, etc.).
The other method is automatic detection of the machine, mainly magnetic particle inspection.
Magnetic particle inspection is based on the interaction between magnetic field leakage and magnetic particles at the defects of DIN 933 bolts. For the defects of DIN 933 bolts (such as cracks, slag inclusions, mixtures, etc.), the difference between the magnetic permeability and the magnetic permeability of steel. The magnetic field at the discontinuities of these materials will change variably, and a leakage magnetic field is generated on the surface of the workpiece at the part where the magnetic flux leaks, thereby attracting the magnetic powder to form a magnetic powder accumulation at the defect-magnetic marks. Under appropriate lighting conditions, the defect location appears And shape, observing and explaining the accumulation of these magnetic powders has achieved the purpose of eliminating defective products.