Method of producing steel wire shots conforming to PSPC with quenching crushing method

Abstract

A method of producing steel wire shots conforming to PSPC (Performance Standard for Protective Coatings) with a quenching crushing method comprises the following steps: (1), waste steel wire is heated into 800 to 850 DEG C and then is quickly placed in cold water to be quenched; (2), the quenched steel wire is placed on a crusher to be subjected into primary crushing; (3), the primary crushed steel wire is placed on a grinder to be subjected into secondary crushing, and the pitch length of the crushed steel wire is below 3 mm; (4), the secondary crushed steel wire is placed on a flinger to be flung for three to five minutes, steel shots with the steel wire diameter less than 0.2 mm are sieved out, the rest is flung and crushed repeatedly, the ratio of diameters to lengths of qualified finished steel wire shots after screening is 1 to 1, and the surfaces of the qualified finished steel wire shots are silvery and have no rusty stain or impurities; (5), the screened and qualified steel wire shots are subjected to heat treatment; and (6), tempered steel wire shots obtained in the step (5) are placed in a hexangular drum for removing acute angles and burrs and quenching oxide skin. The method has the advantages of simple process, feasibility, high surface cleanliness and good fluidity; moreover, the produced metal abrasives are uniform and identical in granularity.

Description

Technical field: [0001] The invention belongs to a manufacturing process of metal abrasives, in particular to a production process of metal abrasives that meets the requirements of the new international shipbuilding and painting standard PSPC. Background technique: [0002] With the development of the international shipbuilding industry, the international shipbuilding industry has put forward higher requirements for coating technology, requiring the diameter of metal abrasives to be reduced from 1.5-1.2mm to less than 1.0mm, in order to improve the surface finish of steel and reduce the thickness of paint , Increase the paint adhesion and cleanliness, reduce the resistance of the ship's navigation, and improve the service life of the ship. [0003] At present, the metal abrasives used in the shipbuilding industry are mainly divided into two categories. One type is called cast steel shot, which is atomized and cooled into beads by molten steel in a pool. The metallographic p...

AI Technical Summary

Problems solved by technology

[0006] The PSPC standard stipulates that the abrasive diameter is between 1.0mm and 0.5mm. The new problems for the abrasive manufacturing industry are: ① It is difficult to achieve both small abrasive particles and increased service life for cast steel shot; steel wire cut shot It has a long service life, but how can it meet the PSPC standard requirements? The steel wire shot is cut with a disc flying knife. The thinner the steel wire, the worse the shape of the finished product, such as the more defective products such as long joints, slopes, and hooks.

②Contradiction between service life and fluidity

The steel wire cut shot imported from South Korea strictly meets the 1:1 standard. Because it is also cut by a flying knife, its fluidity cannot meet the sandblasting requirements.

The ratio of diameter to segment length of domestic steel cut shot is at least about 1:2-1:5, and its fluidity cannot meet the requirements of use. It is also impossible to completely replace cast steel shot with it.

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