JP2006314939A - Automatic coating method and automatic coating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic coating method which can improve coating efficiency and productivity in batch coating a plurality of circumferentially, continuously rotating objects to be coated with a spray gun, and an automatic coating apparatus. <P>SOLUTION: In this automatic coating method, when the plurality of objects to be coated are circumferentially arranged while directing coating surfaces inward, they are continuously rotated, and the objects to be coated sequentially passing through a coating position are batch-spray coated, the spray gun is sprayed while directing outside of the center of the rotation. The objects to be coated are continuously rotated to the right and left, and are sprayed in the respective rotations. The objects to be coated are also autorotated if necessary. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a technique for increasing production capacity by automatic coating when a relatively small amount of an object to be coated is continuously coated in large quantities.

In the field of automatic painting due to the improvement of productivity, there is always a need for improvements to efficiently coat a large number of objects to be continuously coated. In many cases, spray coating is performed, and therefore, it is necessary to improve coating scattering prevention and coating efficiency.

Various automatic coating methods are used depending on various conditions such as an object to be coated, paint, required quality, and coating film performance. When painting a large amount of relatively small objects that can be held in many methods, place a large number of objects to be placed side by side on a net, and apply a painting robot or reciprocating means from the top. Generally, a method of painting in a batch using an automatic painting apparatus provided is generally employed. This method is called flat automatic coating and can increase productivity, but there is waste in terms of coating application efficiency, and there is room for improvement in terms of coating cost and environment.

Similarly, a method of hanging the objects to be coated on a hanger and painting them together is generally used, but has the same problem as described above. On the other hand, as a method of increasing production efficiency and reducing coating costs, a large number of workpiece holders are arranged around the circumference, and this holder is rotated to rotate the workpiece on the circumference with a spray gun. Spindle coating is effective for spraying and painting the workpieces that pass through the coating position one after another.

A large number of rotating objects are regarded as one large object and are applied in batches. This painting method is mainly used in conjunction with a painting robot to apply a large number of the same object at a time and make it uniform. Developed as a method for obtaining paint quality, as seen in Japanese Patent Application Laid-Open No. 2004-33887, it is widely used for mass-produced products such as automobile parts and home appliances as well as information related products such as mobile phones and digital cameras. .

This coating method is implemented based on the idea that a large number of objects to be rotated are regarded as one cylindrical object to be coated, and an average number of objects to be coated are efficiently averaged. Usually, a spray gun is sprayed from the outside. It is done in In this coating method, depending on the shape of the object to be coated, the side part cannot be painted unless the spray gun spray direction is directed to the side part. In such a case, the spray center is directed toward the outer side of the rotation. The side surfaces are coated and then sprayed in the other outward direction to coat both side surfaces.

The spray gun spray direction may be moved by a painting robot or the like, and the two spray guns are set in advance so as to spray the outer sides of a number of objects to be rotated in advance. Also good. As another method, it is possible to have a structure that rotates the object itself, but if the cost of equipment increases or the shape of the object becomes complicated, the uniformity of the surface of the object cannot be maintained. There is a problem such as being limited to the object to be painted similar in shape.

JP 2004-33887 A Japanese Patent Laying-Open No. 2005-13384

As described above, spindle coating that automatically coats a large number of objects that rotate circumferentially as a single object is highly productive and has a great effect on large quantities of the same product. Although there is a major feature in reducing the cost of painting, painting with a spray gun prevents the scattering of paint by the spraying method, further improving the coating efficiency and leaving room for improving productivity. Yes. The present invention provides a new and improved automatic coating that provides even greater benefits depending on the article being coated.

Place a large number of objects to be coated on the holder where the objects are to be placed, with the paint surface facing inward, and rotate this holder to paint a number of objects that rotate continuously. In the automatic coating method, a spray gun to be sprayed is arranged on the center side of a number of rotating objects to be sprayed, and sprayed outward from the rotation center side of the holder.

Furthermore, the holder for placing the object to be painted is rotated to the left and right as necessary, and the shape of the object to be painted is obtained by painting with a spray gun directed to the side of the object to be painted at each rotation. It is made to correspond.

Many objects to be coated on the circumference of the holder are painted one after another by a spray gun, but in order to paint each side of each object, the outer side of the rotation, that is, in the tangential direction Although it is inevitable that the paint scatters outside the object to be painted, it is placed at the center of the many objects to be rotated, and the outer part of the holder rotates outside the center of rotation. According to the means for spraying toward, it is directed to the object to be rotated at all times, and the ratio of scattering can be reduced.

In addition, as the coating efficiency increases, the coating time can be shortened and productivity is improved. In particular, if the shape of the coated surface of the object to be painted is the shape shown in Fig. 2 with the inner surface, the effect is significant. This reduces the environmental pollution caused by the reduction of the coating, and improves the painting efficiency, so that the finishing quality can be maintained and the productivity can be improved even if the painting time is shortened.

FIG. 1 is a schematic diagram illustrating an embodiment of the present invention, and shows a state in which a spray gun 2 mounted on a painting robot 1 is arranged on the center side of an object to be coated and sprayed onto an outer object 3 to be coated. The painting robot 1 is a playback type painting robot having an articulated arm, and a reproduction operation is performed according to a program taught in advance.

A large number of objects 3 to be coated are arranged on the circumference of the holder 4, and in this example, eight pieces are held and arranged by the hangers 5. The holder 4 is rotated by a suitable rotating means, and the object to be coated is continuously rotated on the circumference. The spray gun is located inside this rotation, sprays one after another on the object to be rotated around it, and paints one holder at a time.

The size and interval of the objects to be coated arranged on the circumference are selected according to the necessary location for coating in consideration of the positional relationship with the spray gun. When it is necessary to coat the outer surface of the object to be coated, it is necessary to provide a sufficient distance between them so that the spray can reach the surface sufficiently. There is no particular limitation on the number of objects to be placed on the circumference, but a sufficient spray space must be maintained when a spray gun is placed inside.

The positional relationship between the object to be coated 3 and the spray gun 2 varies depending on the shape of the painted surface of the object to be painted, and is stored in the painting robot. When the inner surface of an object to be coated as shown in FIG. 2 is painted, it may be possible only by spraying from the center, but depending on the situation of the side, the spray gun 2 is positioned at 2A and one inner side 3A is further applied, and the spray gun 2 is set to the position 2B, and one inner side surface 3B is painted. The position and spray direction of the spray gun are set according to the shape of the object to be coated, and desirable conditions are selected by test coating. In the case of a painting robot, these conditions are taught and reproduced repeatedly.

In addition, since the object to be coated rotating on the circumference is coated while moving in a state of passing through the spray region, the moving direction of the coating surface with respect to the spray direction, that is, the rotating direction affects the coating. That is, the rotation efficiency can be improved by setting the rotation direction to a direction in which the surface to be coated approaches the spray gun.

As an embodiment that is normally used, as shown in FIG. 3, areas are provided in which the rotation direction of the holder that rotates the object to be coated is reversed, and the entire coating is completed by passing through both areas. The That is, the operation of the holder is set so that the object to be coated rotates in the X region and rotates counterclockwise in the Y region. As a result, painting is performed aiming at one outer surface in the X region, and painting aiming at the other outer surface in the Y region, and the position and spraying conditions of the spray gun are set so as to achieve uniform coating as a whole. It is decided.

By spraying from the inside of the rotation in this way, the amount of spray particles directed to the object to be coated is limited compared to the case of being sprayed from the outside, and the amount applied to the object to be coated is promoted. The

Usually, when painting is performed on the inner and outer surfaces, painting in a separate process is common, but in the case of painting with the same paint, productivity can be increased by rotating the object to be coated. In this case, it is possible to provide a structure in which a hanger itself holding the object to be coated is provided with a roller for rotation and automatically rotates at the coating position by utilizing the rotational movement of the holder.

Outline diagram for explaining the implementation state of the present invention Schematic diagram showing the relationship between the object to be coated with the spindle of the present invention and the spray gun. Schematic showing the relationship between the rotation of the object of spindle painting of the present invention and the spray gun

Explanation of symbols

1 Coating robot 2, 2A, 2B Spray gun 3 Object 3A, 3B Internal side surface 4 Holder 5 Hanger

Claims (2)

A large number of objects to be coated are arranged in a circle on the holder on which the objects are to be placed, the holder is continuously rotated, and a large number of these rotating objects to be coated are applied together in one holder. In the automatic coating method, the coating surface of the object to be coated is placed on the holder with the coating surface facing inward, and the spray gun mounted on the automatic coating apparatus is placed inside the rotating many objects to be coated. Automatic painting method that sprays on the object to be painted. The coating method according to claim 1, wherein the holder on which the object to be coated is rotated rotates left and right, respectively, and performs coating at each rotation.

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