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Bolt inspection methods

Bolts: mechanical parts, with cylindrical nuts with threaded fasteners. A type of fastener consisting of a head and a screw (cylindrical body with external threads) is to be fitted with a nut for fastening the connection of two parts with through-holes. This type of connection is called bolting. Such as the nut from the bolt on the spin down, and can make the two parts apart, so the bolt connection is a removable connection. Bolt inspection can be divided into two kinds of artificial and machine, the following Chinese fastener network for you respectively detailed.

Artificial is the most primitive is the most common use of consistent detection. In order to minimize the outflow of non-performing goods, the general production staff by visual means of packaging or shipping products to be tested to exclude defective products (including tooth injury, blending, rust, etc.).

The other ways for the machine automatic detection, mainly magnetic particle testing.

Magnetic particle inspection is the use of bolt defects in the magnetic field and magnetic leakage interaction, for the possible existence of bolt defects (such as cracks, slag, mixture, etc.) permeability and steel permeability difference, these materials are not continuous magnetization The magnetic field at the part of the magnetic flux leakage will occur at the surface of the workpiece leakage magnetic field generated to attract the formation of magnetic defects in the formation of magnetic powder defects – magnetic marks in the appropriate light conditions, showing defects in the location and shape, The accumulation of these magnetic powder to observe and explain, has reached the purpose of removing bad products.

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