A continuous jet descaling process for cold metal sheets and strips

Abstract

The invention relates to a continuous cold-state metal plate strip jet descaling technology. The technology includes the processes of shot blasting and pre-descaling, mixed jet descaling, high-pressure water washing, and wiping and drying. The technology is characterized in that the shot blasting and pre-descaling process (H1) comprises at least one centrifugal shot blasting unit (1); centrifugal wheels (11) are arranged on the upper side and the lower side of a metal plate strip (13) in each centrifugal shot blasting unit (1); the centrifugal wheels (11) rotate at a high speed to drive inside sandy hard particles (abrasive) (12) to be shot towards the two lateral surfaces of the metal plate strip (13) at a certain centrifugal speed so as to strip and loosen scales on the two lateral surfaces of the metal plate strip (13); the mixed jet descaling process (12) comprises at least one high-pressure mixed jet descaling unit (2); the high-pressure water washing process (H3) comprises at least one high-pressure pure water washing unit (3). A completely acidless green descaling mode is adopted to perform effective treatment on the upper surface and the lower surface of the metal plate strip with the scales, and a treatment effect of a next process is ensured not to be affected completely.

Description

technical field [0001] The invention relates to the field of surface treatment of metal strips. Specifically, the invention relates to a continuous jet descaling process for cold metal strips. The continuous jet descaling process for cold metal strips is mainly used to achieve Continuous descaling is carried out on the entire surface of the strip, while ensuring that the scales on the front and back of the metal strip after jet descaling have no residue, and the surface roughness meets the process requirements, and at the same time ensure that the front and back can always be dry and clean to enter the next one step process. Background technique [0002] During the hot rolling or heat treatment process of metal materials, a dense covering composed of metal oxides will be formed on the surface, commonly known as "scale skin". The existence of this scale skin can cause the impact as follows to further processing: [0003] On the one hand, the cracks on the surface of the mat...

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Problems solved by technology

However, this method also has the above problems. Therefore, this method not only cannot effectively remove the embedding of hard particles, but also has a low stabilization effect, which may easily cause some surfaces to not be cleaned.

[0009] By consulting relevant patents, it is also found that foreign countries, especially Japan, Germany and other developed countries of metallurgical technology, although they have proposed numerous patents or patent application technologies related to continuous jet, brushing and descaling technology, such as Japan JP06108277A discloses the technology of continuous cold rolling On-line descaling process using combination of acid spray and brush roller, Japan JP55034688A discloses a combined PV rolling descaling-mixed abrasive high-pressure jet descaling method, Japan JP57142710A, JP57068217A, Japan JP59097711A, and Canadian TMW company After 2001, a series of cleaning technologies for steel plate surface scales US20080108281 (A1), US20080182486 (A1) and US20090227184 (A1) were disclosed. In addition, patents or patent applications such as US5388602, Japanese patents JP05092231A, JP09085329A and JP2002102915 Technical solution, but there is still room for improvement in the treatment effectiveness of the metal plate surface after jet descaling

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