Coating dryer and coating drying method

Abstract

To provide a coating dryer that does not require waste liquid treatment, has low energy loss, and can ensure stable coating quality while shortening product lead time.SOLUTION: A coating dryer includes: a heating and washing part that blows hot air onto a formed steel component to clean and heat it; a coating drying part that dries the coated surface while applying a rust-proof coating to the steel component after it has been heated to 60-120°C in the heating and washing part; and a cooling part that cools the steel component after it has been coated with a rust-proof coating, using cooling air at room temperature.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a coating drying device for drying coating on metal products, and more particularly to an apparatus for drying anti-rust coating. [Background technology]

[0002] Anti-rust coating is applied to chassis parts of an automobile, such as a drive shaft, etc. Fig. 4 is a flow diagram showing an example of processes before and after the anti-rust coating in the manufacturing process of chassis parts of an automobile.

[0003] Before applying anti-rust coating, a cleaning process is required to clean the molded product. This is to wash away oil from the molding process and magnetic detection fluid that adheres to the product during inspection, and water, hot water, or cleaning fluid is generally used in the cleaning process. Various proposals have been made so far regarding the process of cleaning the adhered oil and magnetic detection fluid. For example, Patent Document 1 discloses a cleaning device that can provide sufficient cleaning effect while also minimizing heat loss and reducing energy consumption.

[0004] After the washed processed products are dried, they are coated with an anti-rust paint. The paint is then dried naturally or with hot air, cooled, and assembled into the main body, before proceeding to the inspection process. If there are any defects such as peeling paint during the inspection process, they are repaired before being shipped. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2004-8929 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, according to the above process, in order to ensure the quality of the coating, it is necessary to completely remove the moisture before the anti-rust coating, which results in a lot of energy waste and requires waste liquid treatment after cleaning.

[0007] In addition, after the anti-rust coating is applied, it takes time for the paint to dry (in some cases it can take several hours), which lengthens the production lead time. Also, if the process is continued when the paint is not sufficiently dry, there is a problem that the paint is more likely to peel off in later processes.

[0008] Furthermore, heat is sometimes applied to dry the anti-rust coating, and in that case, the processed product needs to be cooled to room temperature before it can be sent to the next process, which creates the problem of large energy losses. Also, because the quality of the coating is affected by external factors such as temperature and humidity, there is also the problem that the coating quality becomes unstable due to seasonal and weather fluctuations.

[0009] Therefore, the present invention has been made in consideration of the above-mentioned problems, and has an object to provide a coating drying apparatus which does not require waste liquid treatment, has little energy loss, shortens production lead time, and ensures stable coating quality. [Means for solving the problem]

[0010] In order to solve the above problems, the paint drying apparatus of the present invention is characterized by comprising a heating and cleaning section that blows hot air onto formed iron parts to clean and heat the iron parts, a paint drying section that applies an anti-rust coating to the cleaned iron parts heated to 60°C to 120°C in the heating and cleaning section while drying the painted surface, and a cooling section that cools the iron parts after the anti-rust coating with room temperature cooling air.

[0011] According to this, since the molded processed products are washed with hot air, no waste liquid is generated, and since the anti-rust coating is applied to the processed products in a warmed state, the coated surface can be dried quickly, thereby realizing a coating drying device which shortens production lead time, reduces energy loss, and can obtain metal products with stable coating quality.

[0012] Here, the heating and cleaning section preferably includes a temperature adjusting section that detects the temperature of the iron parts and adjusts the temperature and amount of hot air blown out so as to prevent the iron parts from being overheated.

[0013] The present invention can also be configured as a paint drying method comprising a heating and cleaning process in which hot air is blown onto a molded iron part to clean and heat the iron part, a paint drying process in which an anti-rust paint is applied to the cleaned iron part heated to 60°C to 120°C in the heating and cleaning process while drying the painted surface, and a cooling process in which the iron part after the anti-rust paint is cooled with cooling air at room temperature. Effect of the Invention

[0014] As described above, the coating drying apparatus according to the present invention does not require waste liquid treatment, reduces energy loss, shortens production lead times, and ensures stable coating quality. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a flow diagram showing an example of a process before and after anti-rust coating by the coating drying device according to the present embodiment. [Diagram 2] 13A and 13B are diagrams illustrating an example of blowing hot air onto a component. [Diagram 3] 13A and 13B are diagrams illustrating another example of blowing hot air onto a component. [Figure 4] FIG. 1 is a flow diagram showing an example of a conventional process before and after anti-rust coating. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0017] The paint drying apparatus of this embodiment is an apparatus for applying anti-rust paint to iron metal parts (iron parts), mainly automobile suspension parts such as drive shafts (hereinafter referred to as "parts"), and then drying them.

[0018] The paint drying equipment is equipped with a heating and cleaning section that blows hot air onto parts before painting to heat them and clean them, an air blowing section that blows air to adjust the temperature to a suitable temperature for painting (cool) and clean the parts, a paint drying section that dries the painted surface while applying an anti-rust coating, a cooling section that cools the parts after painting, and a transport section that transports them between these sections.

[0019] FIG. 1 is a flow diagram showing an example of a process before and after anti-rust coating using a coating drying device.

[0020] The conveying section of the paint drying apparatus carries the molded parts into the heating section within the apparatus.

[0021] The heating section blows hot air onto the parts to heat them and clean off the machining oil and magnetic detection fluid adhering to the parts. The hot air blown here is at 400°C to 700°C, which is the temperature range required to break down the oil. If the temperature is lower than this range, the cleaning effect decreases, and if it is too high, the parts become too hot and this can change the quality of the subsequent product, so the above temperature range is used.

[0022] When applying hot air, it is necessary to do so from a distance of 50 mm or more. If it is placed too close, the parts may overheat and become too hot, which may result in deterioration of their quality.

[0023] When heating with hot air, the hot air supplied to the parts can be efficiently heated by optimizing the nozzle from which the hot air is blown depending on the shape and size of the parts.

[0024] FIG. 2 is a diagram showing an example of blowing hot air onto a component.

[0025] In the case of part 1 having a cylindrical shape with a hollowed-out section inside as shown in FIG. 2, it is preferable to position hot air nozzle 3 not only directly to the side or above to the side, but also so that hot air 5 can be blown out from below to heat the inside of part 1.

[0026] Furthermore, as shown in FIG. 3, in the case of a part 2 shaped like a pipe, it is preferable to use a hot air nozzle 4 formed by cutting slits into a rectangular box so that hot air 6 can be blown out widely.

[0027] The use of hot air for heating in the heating section makes it easier to control the temperature. Specifically, the temperature is detected by a thermocouple installed at the tip of the hot air generator that generates the hot air or a radiation thermometer that directly measures the temperature of the parts, and the temperature and amount of hot air blown out is adjusted to prevent the parts from being overheated, thereby controlling the temperature. In addition, it is preferable to install an emergency heater so that the temperature can be raised to the specified temperature even if the device temporarily stops due to a problem throughout the entire process.

[0028] The parts heated by hot air in the heating section are cleaned in the air blowing section by blowing off moisture and other adhering thereto with air, and are cooled for the next process. Here, the parts are temperature-controlled to a temperature of 60°C to 120°C prior to the next process of anti-rust painting. In other words, if the part temperature exceeds 120°C, it is cooled with air in the air blowing section. Although this is a rare phenomenon, if the part temperature is below 60°C, it is sufficient to increase the part temperature by maintaining the residual heat in the heating section or blowing new hot air without cooling with air in the air blowing section.

[0029] By heating the parts to 60°C to 120°C before applying the anti-rust coating to the painted parts and applying the anti-rust coating in that state, the paint adheres well and the painted surface dries faster, significantly shortening the drying time of the painted surface. If the anti-rust coating is applied when the part temperature is below 60°C, the drying time of the painted surface will be longer, and if the anti-rust coating is applied when the part temperature exceeds 120°C, the paint quality will decrease, so it is preferable to set the part temperature to 60°C to 120°C.

[0030] After the anti-rust coating, the parts are transported to the cooling process in the cooling section. In the cooling section, a blower cools the parts to a temperature (80°C or less) that allows them to be transported to the next process in a specified time (e.g., 30 minutes). At this time, the painted parts other than the painted surface that was quickly dried during the anti-rust coating (e.g., the inside of the part) are also dried at the same time. The cooling air from the blower is at room temperature, but if the cooling time is too fast, the painted surface may crack or the drying may be insufficient, and if the cooling time is too slow, energy loss may increase or the area occupied by the equipment may become large, so it is preferable to adjust the amount of cooling air so that the cooling time is appropriate.

[0031] The paint drying apparatus thus constructed blows hot air onto molded parts to heat and wash them, and applies anti-rust coating to the preheated parts, thereby improving the adhesion of paint to the parts and speeding up the drying of the painted surface. In this case, no cleaning liquid is used, making waste liquid treatment unnecessary. In addition, by significantly shortening the drying time of the painted surface, the parts can be cooled to room temperature with room temperature cooling air, reducing energy loss, and the paint is less susceptible to external factors such as outside temperature and humidity that have a significant effect on the paint, ensuring stable paint quality regardless of seasonal and climatic changes. Thus, a paint drying apparatus is realized that does not require waste liquid treatment, has little energy loss, shortens production lead time, and ensures stable paint quality.

[0032] The above describes the paint drying apparatus according to the present invention based on an embodiment, but the present invention is not limited to this. Various design changes are possible as long as the object of the present invention can be achieved and the gist of the invention is not deviated from, and all of these are included within the scope of the present invention. [Industrial Applicability]

[0033] The paint drying apparatus according to the present invention is useful as a paint drying apparatus for drying paint on metal products, and is particularly suitable as a paint drying apparatus for drying anti-rust paint on automobile parts. [Explanation of symbols]

[0034] 1,2 Parts 3,4 Hot air nozzle 5,6 hot air

Claims

1. a heating and cleaning unit that blows hot air onto the molded iron parts to clean and heat the iron parts; The heating and cleaning section heats the steel parts to 60℃-120℃, and then applies anti-rust paint to the steel parts while drying the painted surface. A cooling section is provided to cool the iron parts after the anti-rust coating with room temperature cooling air. A coating drying device characterized by the above.

2. The heating and cleaning unit includes: Equipped with a temperature adjustment unit that detects the temperature of the iron parts and adjusts the temperature and amount of hot air blown out so that the iron parts do not overheat.

2. The coating drying apparatus according to claim 1.

3. a heating and cleaning process in which hot air is blown onto the molded iron parts to clean and heat the iron parts; In the heating and cleaning process, the iron parts are heated to 60℃ to 120℃, and then anti-rust paint is applied to them while the painted surface is dried in the paint drying process. and a cooling process in which the iron parts after the anti-rust coating are cooled with cooling air at room temperature. A coating drying method comprising the steps of:

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