KR970004368B1 - Painting method with a ship block - Google Patents

Abstract

None.

Description

Painting method of hull block

1 is an overall process diagram showing an embodiment of the present invention.

2 is a block diagram showing step A of FIG.

3 is a temperature distribution diagram of a steel sheet and a coating film by high frequency baking and near infrared baking in FIG.

4 is a block diagram of a conventional wire schematic drying process.

* Description of the symbols for the main parts of the drawings *

1: treated steel sheet (precision steel sheet) 1a: chemical film treatment

2: electrostatic coating powder 3: suction nozzle

4: left part of painting 5: electrostatic coating powder on fine steel plate

6: high frequency baking 7: predetermined shape on precision steel plate

8: cutting 9: intermediate assembly

10: control 11: pickling secondary bottom treatment

12: 2nd painting 13: total assembly

14: shipboard mounting 15: welding assembly

16: base treatment by pickling 17: heating baking before coating

18: liquid immersion powder coating 19: far infrared baking

Conventionally, ships are typically constructed through various main processes, as shown in FIG.

That is, ① steel sheet used on ship is first surface treated by ② short blast, ③ ③ shot blast coating is applied, then ④ steel sheet cutting and bending are processed, and then ⑤ block assembly Is done. At that time, secondary surface treatment, block coating, and unit coating are performed, and (6) secondary surface treatment, interior coating, and bottom and bottom shell coating are carried out in the designing construction.

Looking at the above main process by painting work ③ After the entire anti-corrosion painting of shop primer, after one anti-corrosion coating, ⑤ Block painting and unit painting in block assembly, ⑥ Second surface in design work Treatment, inboard painting, and bottom and bottom plating are carried out.

However, during the welding work in the ⑤ block assembly process and ⑥ design work after the shop primer coating, the shop primer damaged during the cutting and bending of the steel plate must be treated and painted after welding. Therefore, a great cost is required. In addition, since this kind of work is heavy labor, dangerous and dirty work, in the future ship construction work, it is reasonable to justify this point and to secure the workers and reduce the cost. It is said to be a problem. The same holds true for ships, bridges and offshore structures.

The present invention has been proposed in view of such circumstances, and the coating of an economic hull block diagram capable of energy saving, manpower saving, air shortening and cost reduction by improving working environment, securing work safety and reducing labor. It is an object to provide a method.

Therefore, according to the first invention of the present invention, the electrostatic coating powder is uniformly distributed on both surfaces of the steel plate subjected to shop primer coating or image coating treatment after the shot blasting or pickling treatment, respectively. After removing the unnecessary part of the coating powder through the suction nozzle which moves by NC control, the baking process of high frequency baking the scattering electrostatic coating powder on the said steel plate as both sides, and the steel plate which completed this baking process are used for NC control. An intermediate assembly block step of forming an intermediate assembly block by welding a relational steel plate to a part of unpainted part after cutting into a predetermined shape by a predetermined shape, and a counterpart block step of welding a plurality of the intermediate assembly blocks together to form a counterpart block. And, after the second base block is subjected to a second base treatment by pickling, the second block is applied to the second block to form a total assembled block. It characterized by comprising a process.

Next, according to the second aspect of the present invention, a plurality of short-formed steel sheets formed by cutting and marking a steel plate subjected to shop primer coating or an image coating treatment after shot blasting or pickling treatment by NC control are suitably used. Welding assembly process of forming the required cross-section steel to form a cross section, electrostatic coating powder dispersion process of uniformly distributing electrostatic coating powder on the entire surface of the required cross-section steel after pickling, and electrostatic coating on the required cross-section steel Partial unpainting process to remove the unnecessary parts of the powder through the suction nozzle moving by NC control or to leave without painting in advance by masking, high frequency baking of the remaining electrostatic coating powder on the required cross section steel, and preheating the coating It is characterized by consisting of a baking step of baking or fluid immersion powder coating.

In addition, the third invention of the present invention is to carry out far-infrared baking or near-infrared baking of the residual electrostatic coating powder of the required cross section steel instead of the high frequency baking process of the electrostatic coating powder in the hull block coating method of the second invention of the present invention. It is characterized by.

The fourth invention of the present invention is an infrared baking of the residual electrostatic coating powder on the required cross section steel material with high frequency baking of the electrostatic coating powder in the coating method of the hull block of the second invention of the present invention. It is done.

According to the first invention of the present invention, as shown in step A of FIG. 1, the shot blasted or pickled steel sheet is subjected to shop primer coating or chemical conversion coating, followed by electrostatic coating powder. The electrostatic coating powder of each part of the cut | disconnected part, the weld part, and the bend part performed uniformly is spread | distributed uniformly in the following process, and it removes selectively with a suction nozzle by NC control. In this way, the remaining electrostatic coating powder on the precision steel sheet is baked into a predetermined shape on the precision steel sheet by high frequency baking, and is cut into a predetermined shape by NC control, and the contrasting granules are subjected to intermediate cooking by attaching code numbers and the like. Then, the pickling is subjected to a secondary bottom treatment, where the first unpainted portion is removed by pickling, and after high-performance coating by the secondary coating, it is assembled.

According to the second invention of the present invention, as shown in step B of FIG. 1, the treated steel sheet subjected to shop primer coating or chemical conversion coating according to the first invention of the present invention is cut by NC control and is given a code number. After welding, after assembling, dispersing the base and electrostatic coating powder by pickling, the electrostatic coating powder of the unnecessary part is selectively removed by NC control or marking, and after completion of baking by high frequency baking, the intermediate assembly The subsequent step is carried out in accordance with step A above.

Therefore, it is suitable also for medium and small pasting assembling and painting, such as a crude material and a straight pipe.

According to the third invention of the present invention, as shown in step C of FIG. 1, the treated steel sheet subjected to shop primer coating or chemical conversion coating according to the first invention of the present invention is cut by NC control and assigned a code number. After welding, after assembling, pickling, and after pickling, the electrostatic coating powder is selectively removed by NC control or marking, and then the infrared or near infrared baking is performed. Therefore, it is suitable for assembling and painting a molding material, a design product, and a release pipe.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings, in which FIG. 1 is a whole process diagram and FIG. 2 is a block diagram showing process A of FIG.

In FIG. 1, the present invention is composed of a steel plate NC uncoated precoat process shown in the frustrated half, a block coating process in the upper right half, and a lead coating process in the lower right half. , Step A indicates the method of the first invention of the present invention, Step B indicates the step of the second invention of the present invention, and Step C indicates the method of the third invention of the present invention. In addition, the forehand coating process is known.

First, the process A will be described. This is a basic process, and the shot blasting or pickling treatment steel plate 21 is uniformly subjected to the shop primer coating or the image coating treatment 1a, and then the electrostatic coating powder 2 is uniformly formed. The electrostatic coating powders scattered and applied to the cut portions, the weld portions, and the bent portions in the subsequent steps are selectively removed by the suction nozzles 3 by NC control in advance, that is, partly unpainted portions 4. . In this way, the electrostatic coating powder 5 on the precision steel sheet is baked into the predetermined shape 7 on the precision steel plate by the high frequency baking 6, and is cut into the predetermined shape 7 by NC control (8). At the same time, the code number and the like are marked, and the intermediate granules (9) are used to form the contrasting granules (10), and the pickling secondary base treatment (11) is performed. After cleansing, high performance coating is carried out by the secondary coating 12, and the whole tank 13 is carried out.

After the total assembly 13, this is carried out by the ship-mounted body 14 according to the conventional method, and after that, according to the conventional method, it leads to completion and delivery after block joint coating, finishing coating, and the like.

In this basic step A, first, the process of removing the unnecessary powder by the electrostatic coating powder 2 and the NC control, and eventually the part of the unpainted portion 4 are applied to both surfaces, thereby providing the following effects.

① It is unsanitary and dirty. The work is hard. The image of the conventional coating work, such as being unhealthy, can be eliminated.

② By the use of NC control, there is a significant energy saving and manpower saving effect through full automation.

③ It is solvent-free and the electrostatic coating powder is recovered and reused for 90% or more, so almost no waste of the coating powder.

Next, the high frequency baking 6 of the electrostatic coating powder 2 has the following effects.

① Fully automated, can greatly save manpower and energy.

② The quality of coating is improved by high-performance paint such as epoxy.

(3) According to the high frequency baking, it is possible to mainly heat the baking surface of the steel sheet by heating it from the surface of the steel sheet, that is, the back surface of the coating film, as indicated by the solid line in FIG. 3 (A) by the skin effect. The powder coating does not contain bubbles and is energy-saving by high temperature and short baking.

Further, in the intermediate assembly 9 and the counterpart 10 processes, during cutting, assembly and welding by NC control, the coating film is less likely to receive mechanical and thermal damage.

In addition, high frequency baking can save energy by heating for a short time, and since the back surface of a coating film is heated at that time, in the case of extremely short heating of a thick film, as shown in FIG. It is conceivable that the same temperature distribution would result in uneven heating in the thickness direction. On the other hand, since far-infrared heating is heated from the surface side of a coating film, it becomes temperature distribution as shown in FIG. 3 (B), and uses this and high frequency baking together, and shows temperature distribution as shown in FIG. 3 (C). And uniform heating can be performed in the film direction.

Moreover, according to preheating of coating, the coating side can be heated before spraying, and a coating film can be baked by spraying or flowing-immersion (immersing in air-painted paint) by electrostatic lamps. Some unpainted in this case should be removed after masking or construction. When it has not reached complete curing, it is heated again later.

In addition, in the pickling secondary base treatment step, the following effects are obtained.

① It can save a lot of manpower for full automation.

② Pickling can be used to treat some unpainted parts with low cost, and the recovery rate of acid reaches over 90%.

③ The quality is greatly improved by the base treatment by pickling. Finally, the secondary coating has the following effects.

① It is relatively easy to save manpower by robot because the coating point is limited to linear shape.

② The coating process is shortened by the normal temperature quick drying method.

③ Coating quality is improved by high performance paint such as urethane.

Next, the intermediate assembly of the slightly complicated shape structure is painted by the process B in FIG. That is, at the beginning of step A, the processed steel sheet 1 which has been subjected to shop primer coating or chemical conversion coating 1a is cut (8) by NC control as indicated in step B, and is given a code number, and welded and assembled. (15) After the base treatment (6) by pickling and electrostatic coating powder (2), after the dispersion, the electrostatic coating powder of the unnecessary portion is selectively removed (3) by NC control or masking, and then the high frequency baking (6) The baking is terminated by the above step, and the subsequent step is performed in accordance with the step A in the intermediate assembly 9.

Therefore, this process B is also suitable for small and medium pasting granulation, such as a roughening and straight pipe | tube, and painting. In that case, the heating baking 17 and the fluid immersion powder coating 18 before coating may be employ | adopted instead of the high frequency baking 6. As shown in FIG.

In addition, as shown in the process C of FIG. 1, the small granular material or the like, the processed steel sheet 1 which has been subjected to shop primer coating or image coating 1a at the beginning of the process A, is cut by NC control in the process C ( 8) At the same time, the code number is given, and after welding assembly 15, after pickling, 16, the electrostatic coating powder is dispersed, and then the electrostatic coating powder of unnecessary parts is selectively removed by NC control or masking. After that, the far-infrared baking (19) is carried out.

In far-infrared baking and near-infrared baking, since a coating part is mainly heated widely, even if it is a thing of a slightly complicated shape, effective baking can be performed.

Therefore, this process C is suitable for assembling and painting a design product and a release tube other than a small granulated material.

In that case, the pre-heating baking 17 and the fluid immersion powder coating 18 may be employ | adopted instead of near-infrared baking.

In short, according to the first invention of the present invention, after the shot blasting or pickling treatment, the electrostatic coating powder is uniformly distributed on both sides of the steel plate subjected to shop primer coating or chemical conversion coating, respectively, After removing the unneeded portion through the suction nozzle moving by NC control, the baking process of high frequency baking both sides of the scattering electrostatic coating powder on the steel sheet, and the steel sheet after the baking process were cut into a predetermined shape by NC control. Thereafter, an intermediate assembly block step of forming an intermediate assembly block by welding a relational steel plate to a part of the unpainted portion, and a counterpart block step of welding a plurality of the intermediate assembly blocks to form a counterpart block, and the counterpart assembly After the block is subjected to the second base treatment by pickling, the second block is applied to the control block to form a total assembly block. Economical hull block that can save energy, reduce manpower or shorten air and cost by improving working environment, securing working safety and reducing labor in forming small and medium-sized blocks with simple structure by cutting precision steel plate into simple shape Since coating methods, such as these, are obtained, this invention is extremely advantageous industrially.

According to the second invention of the present invention, a cross-sectional steel required by appropriately squeezing a plurality of short-formed steel sheets formed by cutting and marking a steel sheet subjected to shop primer coating or chemical conversion treatment after shot blasting or pickling treatment, by NC control. Welding assembling process to form the surface, electrostatic coating powder dispersing process to uniformly distribute the electrostatic coating powder on the entire surface after pickling the required cross-section steel, and the need for electrostatic coating powder on the required cross-section steel High frequency baking, pre-heating baking or flow immersion of the part of the uncoated portion which is removed through the suction nozzle moving by the NC control or left without pre-painting by masking, and the remaining electrostatic coating powder on the required cross-section steel Short steel sheet obtained by cutting a steel sheet into a number of rectangles by a baking process of powder coating. The present invention is to obtain a coating method of economical hull block such as energy saving manpower saving or air shortening and cost reduction by improving the working environment, securing work safety and reducing labor, which is very effective in forming small and medium blocks. Is extremely beneficial to the industry.

According to the third invention of the present invention, the current electrostatic coating powder on the sectional steel material is far-infrared baking or near-infrared baking instead of the high frequency baking process of the electrostatic coating powder in the hull block coating method of the second invention of the present invention. , Energy saving, manpower saving, air saving and cost saving are possible by improving working environment, securing working safety and reducing labor, which is very effective in forming small and medium blocks made of deformed steel sheets cut into finely shaped steel plate. The present invention is extremely advantageous industrially since a coating method such as an economic hull block is obtained.

According to the fourth invention of the present invention, electrostatic baking is carried out by infrared baking of the required electrostatic coating powder on the sectional steel material together with the high frequency baking of the electrostatic coating powder in the coating method of the hull block of the second invention of the present invention. Energy saving by improving working environment, securing work safety and reducing labor, which is very effective in forming small and medium blocks made of deformed steel sheets in which the fine steel sheet is cut into a slightly complicated shape by uniformly heating the powder coating in the film direction. In addition, the present invention is extremely advantageous industrially because it obtains a coating method such as an economic hull block capable of reducing manpower and reducing air and reducing costs.

Claims (4)

After shot blasting or pickling treatment, the electrostatic coating powder is uniformly distributed on both surfaces of the steel plate subjected to shop primer coating or image coating treatment, and the unnecessary portion of the scattering electrostatic coating powder on the steel sheet is subjected to NC control. After the removal of the suction nozzle moving through the plate, the baking process of high frequency baking of the scattering electrostatic coating powder on the steel plate and the steel plate after the baking process are cut into a predetermined shape by NC control, An intermediate assembly block step of forming an intermediate assembly block by welding a relational steel plate to a coated portion, a counterpart block step of welding a plurality of the intermediate assembly blocks together to form a counterpart block, and the counterpart block for pickling After the secondary base treatment by means of the secondary block is applied to the secondary block is a total assembly block step of forming a control block, characterized in that Application methods such as hull block. The steel sheet which has been subjected to shop primer coating or image coating treatment after shot blasting or pickling treatment is suitably assembled with a plurality of short-formed steel sheets formed by cutting and marking by NC control to form a required cross-sectional steel material. The welding assembly process, the electrostatic coating powder dispersing process of uniformly distributing the electrostatic coating powder on the entire surface of the required cross section steel under acid cleaning, and the unnecessary portion of the electrostatic coating powder on the required cross section steel for NC control. Some uncoated process to remove through the suction nozzle moving through or uncoated by masking, and high-frequency baking of residual electrostatic coating powder on the required cross-section steel, and baking process for pre-heating baking or fluid immersion powder coating Painting method of the hull block, characterized in that consisting of. Infrared baking or near-infrared baking of the residual electrostatic coating powder on the required cross-section steel in place of the high frequency baking process of the electrostatic coating powder in the coating method of the hull block or the like according to claim 2 Way. A method of coating a hull block or the like, wherein the electrostatic coating powder in the coating method of the hull block or the like of claim 2 is subjected to infrared baking at the same time as the residual electrostatic coating powder on the required cross section steel.