A method for grinding and cleaning casting slab surface defects
A cleaning method and casting billet technology, which are applied in the field of casting billet production, can solve the problems that the casting billet cannot meet the rolling requirements, product rejection, etc., and achieve the effects of improving metal yield, fast cleaning speed and reducing production cost.
Active Publication Date: 2020-03-31
福建三钢闽光股份有限公司
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AI Technical Summary
Problems solved by technology
[0004] The invention provides a method for grinding and cleaning the surface defects of the casting slab to solve the problems that the casting slab cannot meet the rolling requirements or even directly reject the product due to the surface defects of the casting slab
Method used
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Experimental program
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Effect test
Embodiment Construction
[0019] A grinding and cleaning method for surface defects of a cast slab, including preparation before cleaning, purging observation ports, marking defect positions, fish scale peeling and grinding, and surface quality verification. The specific steps are as follows:
[0020] Preparation before cleaning: Before each operation, the operator needs to check the flame cleaning gun, medium pressure and connecting leather tube to ensure that the flame cleaning gun is not clogged and melted and that the connecting leather tube is not damaged or leaked. The oxygen pressure during operation is 1.0~1.4 MPa, the gas pressure is 0.4-0.8MPa. Ensure the safety and cleaning effect during the cleaning operation through the preparation before cleaning.
[0021] Purge observation port: Before purging the observation port, the operator first ignites the flame cleaning gun. Rotate the gas adjustment knob of the flame cleaning gun to the fully open state, then rotate the preheating oxygen adjustm...
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Abstract
The invention relates to a casting blank surface defect repair grinding cleaning method which comprises the steps of preparing before cleaning, purging a porthole, marking the defect position, carrying out peeling and repair grinding in a scale type and checking surface quality. Operating personnel use a flame cleaning gun to purge the surface porthole of a to-be-repair ground and checked castingblank; and after purging the porthole, the operating personnel check and confirm the under-the-skin quality of the casting blank at the area of the surface porthole, mark the found defect position andcarry out S-type walking scale type peeling and repair grinding on the casting blank surface on the defect position to eliminate the surface defect on the surface of the casting blank so as to ensurethat a non-defective product is transferred to the next working procedure. With adoption of the casting blank surface defect repair grinding cleaning method, the defect cleaning operation on the surface of the casting blank can be finished in a fast, high-quality and efficient manner, the surface defect of the casting blank is eliminated, the casting blank quality is improved, the casting blank can meet the rolling requirement to prevent generation of a waste product, and the metal yield is increased to further reduce the production cost.
Description
technical field [0001] The invention relates to the technical field of casting slab production, in particular to a grinding and cleaning method for surface defects of a casting slab. Background technique [0002] During the production process of slab continuous casting, some inevitable surface defects such as horizontal and vertical cracks, subcutaneous pinholes, scratches and depressions will appear on the surface of the slab, especially when there are unsteady conditions such as casting speed fluctuations or Especially in the production of microalloy steels such as niobium vanadium titanium, the surface defects of the slab are particularly prominent. [0003] Normally, the cast slab will produce iron oxide scale with a thickness of 1-1.5mm in the heating furnace, and the surface defects within this range can be removed together with the phosphorus removal water to remove the iron oxide scale. However, if the surface defects that are not within this range are not dealt wit...
Claims
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IPC IPC(8): B23K7/06
CPCB23K7/06
Inventor 郑永平陈重赟王龙飞
Owner 福建三钢闽光股份有限公司