Coating process of motorcycle fuel tank

Abstract

The invention relates to the technical field of coating, and discloses a motorcycle fuel tank coating process which comprises the following steps: step 1, workpiece pretreatment; step 2, spraying primer; 3, gloss oil is sprayed; step 4, spraying finish paint; step 5, finishing paint treatment; step 6, polishing treatment; by adding the gloss oil spraying process between the primer and the finish paint, the surface of the primer coating of the motorcycle fuel tank can be smoother and flatter through the leveling property of a gloss oil paint film, an excellent base layer is provided for spraying the finish paint, and it is guaranteed that the surface of a finished motorcycle fuel tank is smooth and flatter; after finishing paint spraying is completed, finishing paint coating treatment is conducted, the finishing paint can be effectively protected, the glossiness and durability of the finishing paint can be improved, the mechanical arm and the electrostatic coating machine are organically matched with manpower, the electrostatic spraying and painting efficiency is high, waste is little, and therefore energy consumption is greatly reduced, paint consumption is reduced, and the hazardous waste generation amount is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of coating, in particular to a coating process for a motorcycle fuel tank. Background Art

[0002] In the current assembly line production, the coating qualification rate has always been an important problem that troubles manufacturers. In the coating construction, after the topcoat is sprayed, there are pits, sand marks, particles, pinholes and other defects on the surface of the topcoat. After spraying the topcoat and baking it off the line, the coating defects, that is, the defects on the surface of the topcoat, exist under the surface topcoat varnish layer. It is impossible to eliminate the defects through polishing and other repair methods, and the surface quality requirements cannot be met and rework is required, which greatly reduces production efficiency and significantly increases production costs. Summary of the invention

[0003] The purpose of the invention is to provide a coating process for a motorcycle fuel tank, wherein the surface of a motorcycle fuel tank workpiece blank is smoother and flatter, an excellent base layer is provided for spraying topcoat, and the surface of a motorcycle fuel tank finished product is ensured to be smooth and flat.

[0004] In order to achieve the above object, the present invention provides a coating process for a motorcycle fuel tank, comprising the following steps:

[0005] Step 1: Workpiece pretreatment;

[0006] Step 2: spray primer;

[0007] Step 3, spray varnish;

[0008] Step 4: Spray topcoat;

[0009] Step 5, finishing varnish treatment;

[0010] Step 6: Polishing.

[0011] As a preferred solution of the present invention, the specific steps in step 1 include: hot water washing, pre-degreasing, degreasing, first water washing, second water washing, surface conditioning, phosphating, third water washing, fourth water washing, pure water washing, and drying.

[0012] As a preferred embodiment of the present invention, the specific steps in step 2 include: spraying the first gray primer, drying the first gray primer, scraping the first atomic putty, polishing the first atomic putty layer, spraying the second gray primer, drying the second gray primer, scraping the second atomic putty, polishing the second atomic putty layer, primer pretreatment, spraying two-component gray primer, and drying the gray primer.

[0013] As a preferred solution of the present invention, the specific steps of primer pretreatment are: clean the workpiece surface with gasoline, then smooth the defects with sandpaper, then wipe the workpiece surface with a sticky cloth, and blow dust on the workpiece surface through an air pipe.

[0014] As a preferred solution of the present invention, the specific steps in step 3 include: spraying the first varnish, spraying the second varnish, and drying the varnish.

[0015] As a preferred solution of the present invention, the varnish in step 3 is dual-curing varnish.

[0016] As a preferred solution of the present invention, the specific steps in step 4 include: spraying the first topcoat, spraying the second topcoat, drying the topcoat, spraying the color varnish, and drying.

[0017] As a preferred solution of the present invention, the specific steps in step 5 include: spraying a first finishing varnish, spraying a second finishing varnish, and drying the finishing varnish, and the finishing varnish is a dual-curing varnish.

[0018] As a preferred solution of the present invention, the specific steps in step 6 include: one polishing, one inspection, two polishing, and two inspections.

[0019] As a preferred solution of the present invention, a pretreatment operation is performed before performing step 3, step 4 and step 5. The specific steps of the pretreatment operation are: rubbing gasoline on the surface of the workpiece to clean it, then using sandpaper to smooth the defects, and then using a sticky cloth to wipe the surface of the workpiece clean, and blowing dust on the surface of the workpiece through the air pipe.

[0020] Compared with the prior art, the coating process of a motorcycle fuel tank in the embodiment of the present invention has the following beneficial effects:

[0021] The present invention adds a varnish spraying process between the two-component grey base and the topcoat, which not only facilitates the identification of quality defects on the grey base, but also makes the grey base of the motorcycle fuel tank smoother and flatter through the leveling property of the varnish film, provides an excellent base for spraying the topcoat, and ensures that the surface of the finished motorcycle fuel tank is smooth and flat; after the topcoat is sprayed, a varnish treatment is performed, which can effectively protect the topcoat and improve the gloss and durability of the fuel tank. DETAILED DESCRIPTION

[0022] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] A coating process for a motorcycle fuel tank according to a preferred embodiment of the present invention comprises the following steps:

[0024] Step 1: Workpiece pretreatment;

[0025] Step 2: Electrostatic spraying of primer;

[0026] Step 3, spray varnish;

[0027] Step 4: Electrostatic spraying of topcoat;

[0028] Step 5, finishing varnish treatment;

[0029] Step 6: Polishing.

[0030] Exemplarily, the specific steps in step 1 include: hot water washing, pre-degreasing, degreasing, first water washing, second water washing, surface conditioning, phosphating, third water washing, fourth water washing, pure water washing, and drying. Hot water washing to remove obvious debris on the workpiece; pre-degreasing to remove most of the oil and debris on the workpiece; degreasing to completely remove the oil and debris on the workpiece; the first water washing to remove most of the degreasing agent on the workpiece; the second water washing to completely remove the degreasing agent on the workpiece; surface conditioning to change the microscopic state of the metal surface, so that it forms a fine, uniform and dense phosphating salt film during the phosphating process to improve the phosphating quality; phosphating to enhance the bonding force between the coating film and the workpiece, improve the adhesion and corrosion resistance of the coating; the third water washing to clean the phosphating liquid remaining on the surface of the workpiece; the fourth water washing to completely remove the phosphating liquid remaining on the surface of the workpiece, pure water washing to wash away the impurities attached to the surface of the workpiece, and reduce the influence of dust and other pollutants on the adhesion of subsequent coatings; drying to ensure that the surface of the workpiece is dry to provide a water-free surface for subsequent processes; ensure that the primer can stably adhere to the workpiece when the primer is sprayed later. Before performing step 1, first inspect the inner cavity and surface of the workpiece, and remove the workpieces that are yellow, rusty, have obvious pits, and have oxide scales on the welding parts.

[0031] Exemplarily, the specific steps in step 2 include: spraying the first gray primer by an electrostatic coating machine and then manually touching up the paint to ensure the uniformity of the gray primer, drying the first gray primer, scraping the first atomic putty, polishing the first atomic putty layer after the atomic putty is dried, spraying the second gray primer by an electrostatic coating machine, drying the second gray primer, scraping the second atomic putty, polishing the second atomic putty layer after the atomic putty is dried, primer pretreatment, spraying two-component gray primer by an electrostatic coating machine and then manually touching up the paint, and drying the gray primer; gray primer and two-component gray primer can improve the adhesion of the topcoat and increase the fullness of the topcoat, and scraping the atomic putty can fill and modify the pits, gaps, holes and other defects on the surface of the workpiece, and the surface of the workpiece can be effectively smoothed and even by alternating the gray primer and the atomic putty for multiple times.

[0032] Exemplarily, the specific steps of primer pretreatment are: clean the workpiece surface with gasoline, then smooth the defects with sandpaper, wipe the workpiece surface with a sticky cloth, and blow dust on the workpiece surface through an air pipe, which effectively improves the coating quality of the two-component primer.

[0033] Exemplarily, the specific steps in step 3 include: electrostatically spraying the first varnish through a robot, electrostatically spraying the second varnish through a robot, and drying the varnish. The varnish is specifically a dual-curing varnish to ensure that the varnish has a good leveling effect. The use of a robot for electrostatic spraying can reduce dead angles in spraying, while ensuring good uniformity in spraying, providing a workpiece with a smooth surface for subsequent topcoat spraying operations, and ensuring good flatness of the surface of the finished motorcycle fuel tank.

[0034] Exemplarily, the specific steps in step 4 include: electrostatically spraying the first topcoat by a robot, electrostatically spraying the second topcoat by a robot, drying the topcoat, spraying the chromatic varnish, and drying the chromatic varnish. The use of a robot for electrostatic spraying can reduce dead angles in spraying, while ensuring good uniformity in spraying, and ensuring the integrity, uniformity, durability and enhanced adhesion of the topcoat coating.

[0035] Exemplarily, the specific steps in step 5 include: electrostatically spraying the first topcoat by a robot, electrostatically spraying the second topcoat by a robot, and drying the topcoat. The topcoat is a double-curing varnish. Electrostatic spraying by a robot can reduce dead angles in spraying, while ensuring good uniformity in spraying, effectively protecting the topcoat, and improving the overall gloss and wear resistance of the motorcycle fuel tank.

[0036] Exemplarily, the specific steps in step 6 include: one polishing, one inspection, two polishing, and two inspections. The polishing operation can make the paint surface smoother and brighter.

[0037] Exemplarily, a pretreatment operation is performed before performing step 3, step 4 and step 5. The specific steps of the pretreatment operation are: clean the surface of the workpiece with gasoline, then smooth the defects with sandpaper, then wipe the surface of the workpiece with a sticky cloth, and blow dust on the surface of the workpiece through an air pipe to ensure the cleanliness of the workpiece surface so that the paint can adhere better.

[0038] In summary, the present invention can not only identify quality defects on the gray primer and repair defects in advance to ensure the smooth surface of the primer by adding a varnish spraying process between the two-component gray primer and the topcoat, but also make the motorcycle fuel tank primer smoother and flatter through the leveling property of the varnish film, thereby providing an excellent base layer for spraying the topcoat and ensuring the smoothness of the surface of the finished motorcycle fuel tank; after the topcoat is sprayed, a varnish treatment is performed to effectively protect the topcoat and improve the gloss and durability of the fuel tank; electrostatic spray painting has high efficiency and less waste, thereby reducing costs. The present invention adopts a manipulator, an electrostatic coating machine and manual labor in an organic manner, and the electrostatic spray painting has high efficiency and less waste, thereby leading to a significant reduction in energy consumption and a reduction in the amount of paint consumed.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A coating process for a motorcycle fuel tank, characterized in that: The following steps are involved: Step 1: Workpiece pretreatment; Step 2: spray primer; Step 3, spray varnish; Step 4: Spray topcoat; Step 5, finishing varnish treatment; Step 6: Polishing.

2. The coating process for a motorcycle fuel tank according to claim 1, characterized in that: The specific steps in step 1 include: hot water washing, pre-degreasing, degreasing, first water washing, second water washing, surface conditioning, phosphating, third water washing, fourth water washing, pure water washing, and drying.

3. The motorcycle fuel tank coating process according to claim 1, characterized in that: The specific steps in step 2 include: spraying the first gray primer, drying the first gray primer, scraping the first atomic putty, polishing the first atomic putty layer, spraying the second gray primer, drying the second gray primer, scraping the second atomic putty, polishing the second atomic putty layer, primer pretreatment, spraying two-component gray primer, and drying the gray primer.

4. The coating process for a motorcycle fuel tank as claimed in claim 3, characterized in that: The specific steps of primer pretreatment are: clean the surface of the workpiece with gasoline, then smooth it with sandpaper at the defects, wipe the surface of the workpiece with a sticky cloth, and blow dust on the surface of the workpiece through the air pipe.

5. The coating process for a motorcycle fuel tank according to claim 1, characterized in that: The specific steps in step 3 include: spraying the first varnish, spraying the second varnish, and drying the varnish.

6. The coating process for a motorcycle fuel tank as claimed in claim 5, characterized in that: The varnish in step 3 is dual-curing varnish.

7. The coating process for a motorcycle fuel tank according to claim 1, characterized in that: The specific steps in step 4 include: spraying the first topcoat, spraying the second topcoat, drying the topcoat, spraying the color varnish, and drying.

8. The motorcycle fuel tank coating process according to claim 1, characterized in that: The specific steps in step 5 include: spraying the first finishing varnish, spraying the second finishing varnish, and drying the finishing varnish, and the finishing varnish is a dual-curing varnish.

9. The motorcycle fuel tank coating process according to claim 1, characterized in that: The specific steps in step 6 include: primary polishing, primary inspection, secondary polishing, and secondary inspection.

10. The motorcycle fuel tank coating process according to claim 1, characterized in that: Before performing step 3, step 4 and step 5, a pretreatment operation is first performed. The specific steps of the pretreatment operation are: rub gasoline on the surface of the workpiece to clean it, then use sandpaper to smooth the defects, then use a sticky cloth to wipe the surface of the workpiece clean, and blow dust on the surface of the workpiece through the air pipe.