Pretreatment method of steel for ship construction

Abstract

The invention relates to the technical field of shipbuilding, and discloses a shipbuilding steel pretreatment method which comprises the following steps: checking steel, checking cleanliness, collecting various index data, integrating the data, and screening out unqualified steel; the surface of the steel is cleaned, dirt on the surface of the classified steel is removed, a flow production line for steel cleaning is built, workers wash the steel in advance through clear water, then the steel is polished, and next-step treatment is conducted after the surface of the steel is treated to be neat; the surface of the steel is derusted, the cleaned surface of the steel is derusted through a shot blasting procedure, the surface needs to be coated with a layer of anti-rust paint during derusting of the steel, a coating machine needs to be used for operation in the process, and the thickness of the anti-rust paint on the steel is set to range from 25 micrometers to 150 micrometers; and drying treatment is conducted on the steel, after water on the surface of the steel is wiped away, the surface of the steel is dried through a drying machine, and the antirust paint is fixed to the surface of the steel.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and more particularly to a method for pretreating steel materials for shipbuilding. Background Art

[0002] Shipbuilding is the manufacturing industry that builds or manufactures ships, usually on a slipway or dock in a specialized facility, a shipyard. Shipbuilding itself uses a wide range of technologies, from the hull to the engine, and steel pretreatment is a process that aims to improve the corrosion resistance and fatigue resistance of steel and extend its service life. Steel pretreatment mainly includes the steps of surface shot blasting and coating with a protective primer. Through this treatment, the corrosion resistance of mechanical products and metal components of steel is improved, while the process state of the steel surface is optimized, which is conducive to CNC cutting machine blanking and precision blanking. In addition, steel pretreatment can improve the efficiency of cleaning work, reduce labor intensity and pollution to the environment.

[0003] A large amount of steel is needed in the process of shipbuilding, and these steels need to be pretreated before being put into construction. In the existing pretreatment process of steel for shipbuilding, the surface of the steel needs to be cleaned, rusted and dried. However, even after pretreatment, some of the steel quality still does not meet the standards and needs to be reworked or replaced, which greatly reduces people's work efficiency. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a method for pretreating steel for shipbuilding, which has the advantage of more precise operation.

[0005] To achieve the above object, the present invention provides the following technical solution: A method for pretreating steel for shipbuilding, comprising the following steps:

[0006] S1: Inspect the steel, check its cleanliness, and collect data on various indicators. After integrating the data, filter out unqualified steel, separate qualified steel from unqualified steel, and then process the steel in the next step;

[0007] S2: Clean the steel surface, remove the surface dirt of the classified steel, set up a steel cleaning production line, workers pre-rinse with clean water, polish the steel, and clean the steel surface before proceeding to the next step;

[0008] S3: Remove rust from the steel surface. Use shot blasting to remove rust from the cleaned steel surface. When removing rust from the steel, a layer of anti-rust paint needs to be applied on the surface. A coating machine is required to operate this process. The thickness of the anti-rust paint on the steel is set to between 25 and 150 μm.

[0009] S4: Dry the steel. After wiping off the moisture on the surface of the steel, use a dryer to dry the surface of the steel to fix the anti-rust paint on the surface of the steel.

[0010] As a preferred technical solution of the present invention, the inspection of steel in S1 includes appearance inspection, size inspection, chemical composition analysis, mechanical property test and non-destructive testing; inspecting the appearance cracks and size requirements of the steel, detecting the chemical substances contained in the steel, and judging the corrosion resistance of the steel, while the mechanical property test detects the tensile strength, bending and hardness of the steel, and finally the internal structure of the steel is detected by non-destructive testing.

[0011] As a preferred technical solution of the present invention, the cleanliness inspection in S1 requires people to observe the surface of the steel material and select the subsequent cleaning method according to the cleanliness of the steel material, using manual flushing and mechanized cleaning respectively.

[0012] As a preferred technical solution of the present invention, the data collected in S1 include data on steel surface cleanliness, steel size, steel chemical composition, tensile strength and internal structure.

[0013] As a preferred technical solution of the present invention, after the unqualified steels are separated from the qualified steels in S1, the unqualified steels are replaced in advance.

[0014] As a preferred technical solution of the present invention, the cleaning of the steel surface in S2 includes cleaning dust, burrs and stains attached to the steel surface, and flushing with a water gun during the cleaning process; this facilitates improving the efficiency of people's cleaning of the steel surface.

[0015] As a preferred technical solution of the present invention, the surface dirt is removed in S2 by manual wiping, and the dust and stains attached to the surface of the steel are wiped clean before entering the next step, so as to prevent the cleanliness of the steel from affecting the quality of subsequent work.

[0016] As a preferred technical solution of the present invention, the grinding of the steel in S2 is specifically processed by a deburring machine, which deburrs multiple edges and corners of the steel and cleans the surface of the steel; this can improve subsequent processing of the steel.

[0017] As a preferred technical solution of the present invention, in S3, the rust on the steel surface is removed by using a shot blasting machine. After the surface of the steel is polished, the surface of the steel is rinsed again to ensure that the surface of the steel is always in a neat state before the rust inhibitor is applied.

[0018] As a preferred technical solution of the present invention, the steel is dried in S4 by using a dryer for 1 to 2 hours, and the steel is sterilized to prevent the microorganisms attached to the steel from accelerating the corrosion resistance of the steel and improve the service life of the steel.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: by inspecting the steel before pre-treatment, the initial data of the steel can be collected, unqualified steel can be screened out and separated from qualified steel, and the surface treatment, surface rust removal and drying treatment used in the pre-treatment of the steel, a coating of 25 to 150 μm on the surface of the steel is used to improve the corrosion resistance and wear resistance of the steel, and the steel is pre-treated through the processes of surface cleaning, rust removal and drying, which effectively improves the quality of the steel after pre-treatment, making it easier for people to better improve the construction quality during shipbuilding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall process of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figure 1 As shown, the present invention provides a method for pretreating steel for shipbuilding, comprising the following steps:

[0023] S1: Inspect the steel, check its cleanliness, and collect data on various indicators. After integrating the data, filter out unqualified steel, separate qualified steel from unqualified steel, and then process the steel in the next step;

[0024] S2: Clean the steel surface, remove the surface dirt of the classified steel, set up a steel cleaning production line, workers pre-rinse with clean water, polish the steel, and clean the steel surface before proceeding to the next step;

[0025] S3: Remove rust from the steel surface. Use shot blasting to remove rust from the cleaned steel surface. When removing rust from the steel, a layer of anti-rust paint needs to be applied on the surface. A coating machine is required to operate this process. The thickness of the anti-rust paint on the steel is set to between 25 and 150 μm.

[0026] S4: Dry the steel. After wiping off the moisture on the surface of the steel, use a dryer to dry the surface of the steel to fix the anti-rust paint on the surface of the steel.

[0027] Among them, the inspection of steel in S1 includes appearance inspection, size inspection, chemical composition analysis, mechanical property test and non-destructive testing; checking the appearance cracks and size requirements of steel, detecting the chemical substances contained in steel, judging the corrosion resistance of steel, and the mechanical property test tests the tensile strength, bending and hardness of steel, and finally the internal structure of steel is tested by non-destructive testing.

[0028] The cleanliness inspection in S1 requires people to observe the surface of the steel and select the subsequent cleaning method according to the cleanliness of the steel, which can be manual flushing or mechanized cleaning.

[0029] The various index data collected in S1 include data on steel surface cleanliness, steel size, steel chemical composition, tensile strength and internal structure.

[0030] Among them, after the unqualified steel and the qualified steel are separated in S1, the unqualified steel is replaced in advance.

[0031] Among them, the cleaning of the steel surface in S2 includes cleaning the dust, burrs and stains attached to the steel surface, and flushing with a water gun during the cleaning process, so as to improve the efficiency of people's cleaning of the steel surface.

[0032] Among them, the surface dirt is removed in S2 by manual wiping, and the dust and stains attached to the surface of the steel are wiped clean before entering the next step, so as to prevent the cleanliness of the steel from affecting the quality of subsequent work.

[0033] The grinding of the steel in S2 is specifically processed by a deburring machine, which deburrs multiple corners of the steel and cleans the surface of the steel, thereby improving the subsequent processing of the steel.

[0034] In the step S3, the rust on the steel surface is removed by using a shot blasting machine. After the surface of the steel is polished, the surface of the steel is rinsed again, so that the surface of the steel is always in a clean state before the rust inhibitor is applied.

[0035] In the step S4, the steel is dried by using a dryer for 1 to 2 hours, and the steel is sterilized to prevent the microorganisms attached to the steel from accelerating the corrosion resistance of the steel and improve the service life of the steel.

[0036] The working principle and use process of the present invention are as follows: people first inspect the steel, check the cleanliness of the steel, and use appearance inspection, size inspection, chemical composition analysis, mechanical property test and non-destructive testing to collect the appearance cracks and size requirements of the steel, detect the chemical substances contained in the steel, and judge the corrosion resistance of the steel. The mechanical property test detects the tensile strength, bending and hardness of the steel, and various index data of the internal structural integrity. After the data is integrated, unqualified steel is screened out, and qualified steel is separated from unqualified steel, and then the surface of the steel is cleaned. During the cleaning process, a water gun is used for flushing to remove the classified steel surface. Dirt is removed from the steel surface and several steel cleaning production lines are set up. Workers pre-rinse the steel with clean water, then polish it, clean the dust, burrs and stains attached to the steel surface and then remove rust from the steel surface. Shot blasting is used to remove rust from the cleaned steel surface. When removing rust from the steel, a layer of anti-rust paint needs to be applied on the surface. A coating machine needs to be used in this process, and the thickness of the anti-rust paint on the steel is set to between 25 and 150 μm. The steel is dried. After wiping off the moisture on the steel surface, a dryer is used to dry the steel surface for 1 to 2 hours until the anti-rust paint is fixed on the steel surface.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for pretreating steel for shipbuilding, characterized in that: The following steps are included: S1: Inspect the steel, check its cleanliness, and collect data on various indicators. After integrating the data, filter out unqualified steel, separate qualified steel from unqualified steel, and then process the steel in the next step; S2: Clean the steel surface, remove the surface dirt of the classified steel, set up a steel cleaning production line, workers pre-rinse with clean water, polish the steel, and clean the steel surface before proceeding to the next step; S3: Remove rust from the steel surface. Use shot blasting to remove rust from the cleaned steel surface. When removing rust from the steel, a layer of anti-rust paint needs to be applied on the surface. A coating machine is required to operate this process. The thickness of the anti-rust paint on the steel is set to between 25 and 150 μm. S4: Dry the steel. After wiping off the moisture on the surface of the steel, use a dryer to dry the surface of the steel to fix the anti-rust paint on the surface of the steel.

2. A method for pretreating steel for shipbuilding according to claim 1, characterized in that: The inspection of steel in S1 includes appearance inspection, size inspection, chemical composition analysis, mechanical property test and non-destructive testing; checking the appearance cracks and size requirements of steel, detecting the chemical substances contained in steel, judging the corrosion resistance of steel, and the mechanical property test tests the tensile strength, bending and hardness of steel, and finally the internal structure of steel is tested by non-destructive testing.

3. A method for pretreating steel for shipbuilding according to claim 1, characterized in that: The cleanliness inspection in S1 requires people to observe the surface of the steel material and select the subsequent cleaning method according to the cleanliness of the steel material, which can be manual flushing or mechanized cleaning.

4. A method for pretreating steel for shipbuilding according to claim 1, characterized in that: The various index data collected in S1 include data on steel surface cleanliness, steel size, steel chemical composition, tensile strength and internal structure.

5. A method for pretreating steel for shipbuilding according to claim 1, characterized in that: After the unqualified steel materials and the qualified steel materials are separated in S1, the unqualified steel materials are replaced in advance.

6. A method for pretreating steel for shipbuilding according to claim 1, characterized in that: In S2, the steel surface is cleaned to remove dust, burrs and stains attached to the steel surface, and a water gun is used to rinse the steel surface.

7. A method for pretreating steel for shipbuilding according to claim 1, characterized in that: In S2, the surface dirt is removed by manual wiping, and the dust and stains attached to the surface of the steel are wiped clean before entering the next step.

8. A method for pretreating steel for shipbuilding according to claim 1, characterized in that: The grinding of the steel in S2 is specifically performed by a deburring machine, which deburrs multiple edges and corners of the steel to clean the surface of the steel.

9. A method for pretreating steel for shipbuilding according to claim 1, characterized in that: In the above-mentioned S3, the rust on the surface of the steel material is removed by using a shot blasting machine. After the surface of the steel material is polished, the surface of the steel material is rinsed again.

10. A method for pretreating steel for shipbuilding according to claim 1, characterized in that: In S4, the steel is dried by using a dryer for 1 to 2 hours, and the steel is sterilized.

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