JP4264148B2 - Method and apparatus for pre-makeup of indefinite curved surface workpiece - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pretreatment for performing cosmetics such as painting and printing on the surface of a resin molded product, and particularly when the resin molded product has an indefinite curved surface and is molded in a relatively large size. The present invention also relates to a novel pre-treatment method for makeup that can dramatically improve the adhesion of paints and coatings by uniformly irradiating the surface with ultraviolet rays.
[0002]
BACKGROUND OF THE INVENTION
For example, for automobile parts, bumpers are molded as relatively large molded products such as polycarbonate (PC) or acrylonitrile butadiene styrene resin (ABS resin). Recently, however, other than this, front fenders, rear fenders, or door panels are also used. There is a movement to make a surface decoration such as painting or printing on the molded product. These new members are often molded from resin materials such as polycarbonate (PC), polybutylene terephthalate (PBT), or polycarbonate / polybutylene terephthalate (PC / PBT). In many cases, the adhesion of paints and coatings is not good, and molded products using resin materials with poor paints and coatings have been pre-treated by irradiating with ultraviolet rays. It was generalized.
[0003]
However, when the molded product, that is, the workpiece constitutes the body of an automobile as described above, in addition to being molded in a relatively large size, an indefinite curved surface having a different curvature radius is formed at various parts of the product. In some cases, it is difficult to uniformly irradiate the surface of ultraviolet rays. In other words, the conventional irradiation form normally has an indefinite curved surface because the workpiece is hidden in the tunnel-shaped irradiation chamber while irradiating ultraviolet rays from the upper part or the side part of the irradiation chamber formed in a tunnel shape, In addition, in a workpiece or the like formed in a relatively large size, the irradiation distance, the irradiation angle, and the like cannot always be kept constant, and it may be difficult to perform uniform irradiation as a whole.
[0004]
In particular, when the design elements include complicated patterns, gradations, and the like due to diversification of user's tastes recently, the above-mentioned problems appear more remarkably. That is, in order to meet such a design requirement at a reasonable cost, manual painting is not often performed, and curved surface printing using an automated apparatus is suitable. Although this method has already been put to practical use in many fields, it is complicated because the transfer film on which the design pattern is printed is suspended in the transfer tank, and the workpiece is pressed against it and transferred by hydraulic pressure. It was difficult to adhere the transfer ink to a curved surface or a portion where the hydraulic pressure is difficult to be applied. For this reason, in this type of hydraulic transfer method, pretreatment such as ultraviolet irradiation as described above is performed on the workpiece for the purpose of improving the adhesion of the transfer ink. However, as described above, when the workpiece surface forms a complicated three-dimensional shape, there is a portion that is difficult to be irradiated by a simple irradiation tunnel, that is, a portion that is difficult to adhere to the transfer ink. It was necessary to deal with preprocessing.
[0005]
[Technical issues for which development was attempted]
The present invention has been made in view of such a background, and is a stage prior to performing makeup such as painting or printing on a resin molded product having an indefinite curved surface and molded in a relatively large size. Thus, the present inventors have attempted to develop a novel pre-treatment method for makeup that can dramatically improve the adhesion of paints and coatings by uniformly irradiating the surface with ultraviolet rays.
[0006]
[Means for Solving the Problems]
That is, the method for pretreatment of indefinite curved surface workpiece according to claim 1 performs pretreatment by ultraviolet irradiation prior to performing makeup on a workpiece (W) formed from an appropriate resin material so as to have an indefinite curved surface. In the way to do
The ultraviolet irradiation keeps the irradiation distance between the light source unit (41) and the workpiece (W) that irradiates ultraviolet rays substantially constant, and the relative moving speed between the light source unit (41) and the workpiece (W) is also almost constant. It is characterized by irradiating ultraviolet rays from the normal direction of the irradiation action part in the workpiece (W) while maintaining a constant state .
According to this invention, during irradiation with ultraviolet rays , the irradiation distance and moving speed between the light source unit and the work are maintained, and since the irradiation is performed from the normal direction of the irradiation action part , the work has an indefinite curved surface, And even if it is formed in a comparatively large size, it is possible to uniformly irradiate the workpiece surface with ultraviolet rays. Moreover, not only the form which fixes a workpiece | work and moves a light source unit but various irradiation forms, such as the form which fixes a light source unit and moves a workpiece | work, can be taken.
[0007]
In addition to the requirement described in claim 1, the ultraviolet light irradiation is applied to the workpiece (W) set in a fixed state by the light source unit (41). It is characterized by being performed while moving along the surface of the workpiece (W) .
According to the present invention, a specific structure for uniformly irradiating the work surface with ultraviolet rays is made possible.
[0008]
Furthermore makeup pretreatment method indeterminate curved workpiece according to claim 3, wherein, in addition to the requirements of claim 1, wherein the ultraviolet irradiation, to set to a fixed state by the light source unit (41), the workpiece (W) Is performed while appropriately moving three-dimensionally.
According to the present invention, a specific structure for uniformly irradiating the work surface with ultraviolet rays is made possible.
[0009]
According to a fourth aspect of the present invention, in addition to the requirements of the first, second, or third aspect , the makeup is a hydraulic transfer.
According to the present invention, a complicated transfer pattern can be more stably printed even on a work forming a complicated three-dimensional curved surface.
[0010]
In addition, the pre-decoration processing device for an indefinite curved surface workpiece according to claim 5 is a light source unit that irradiates ultraviolet rays prior to performing makeup on a workpiece (W) formed from an appropriate resin material so as to have an indefinite curved surface. (41) and an irradiation chamber (3) in which the light source unit (41) is installed, and an apparatus for irradiating the work (W) with ultraviolet rays in the stage before makeup,
Said light source unit (41), together with the irradiation distance between the workpiece (W) is maintained substantially constant, with the relative movement speed is maintained substantially constant between the workpiece (W), the workpiece (W) The workpiece (W) is irradiated with ultraviolet rays from the normal line direction of the irradiation action portion in FIG.
According to the present invention, the irradiation distance and the moving speed between the light source unit and the workpiece are maintained during the ultraviolet irradiation, and the irradiation is performed from substantially the normal direction of the irradiation surface, so that the workpiece has an indefinite curved surface, and Even if it is formed in a relatively large size, it is possible to uniformly irradiate the workpiece surface with ultraviolet rays. Moreover, not only the form which fixes a workpiece | work and moves a light source unit but various irradiation forms, such as the form which fixes a light source unit and moves a workpiece | work, can be taken.
[0011]
The cosmetic pretreatment apparatus indeterminate curved workpiece according to claim 6, wherein, in addition to the requirements of claim 5, wherein said light source unit (41), along the surface of the set to a fixed state by the work (W) move It is characterized by irradiating with ultraviolet rays.
According to the present invention, a specific structure for uniformly irradiating the work surface with ultraviolet rays is made possible.
[0012]
The cosmetic pretreatment apparatus indeterminate curved workpiece according to claim 7, wherein, in addition to the requirements of claim 5, wherein said workpiece (W), compared configured light source unit in a fixed state (41), suitably three-dimensional It is characterized by receiving ultraviolet irradiation while moving.
According to the present invention, a specific structure for uniformly irradiating the work surface with ultraviolet rays is made possible.
[0013]
In addition to the requirements of claim 5, 6 or 7 , the makeup pretreatment apparatus for an indefinite curved surface workpiece according to claim 8 is characterized in that the makeup is hydraulic transfer.
According to the present invention, a complicated transfer pattern can be more stably printed even on a work forming a complicated three-dimensional curved surface.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below based on the illustrated embodiments. In the description, the makeup pretreatment apparatus 1 that implements the makeup pretreatment method for an indefinite curved surface workpiece will be described first, and then the makeup pretreatment method will be described while explaining the operation mode of the apparatus.
The makeup pretreatment device 1 is applied to the workpiece W in order to improve the adhesion of the paint and the coating film on the surface of the workpiece W formed from an appropriate resin material before applying makeup such as painting or printing on the surface. Irradiates ultraviolet rays. As an example, as shown in FIG. 1, this apparatus includes a conveying device 2 connected from the makeup pretreatment device 1 to the makeup process, an irradiation chamber 3 where ultraviolet irradiation is performed, and irradiation that substantially irradiates ultraviolet rays. The device 4 is provided. For the workpiece W processed by the present invention, for example, a relatively large molded product having a complicated indefinite curved surface with different radii of curvature in various parts such as a front fender, a rear fender or a front bumper of an automobile is suitable. However, it is of course possible that the radius of curvature is stable on the workpiece surface, or that the workpiece W itself is relatively small. As the molding material, polycarbonate (PC), polybutylene terephthalate (PBT), polycarbonate / polybutylene terephthalate (PC / PBT), acrylonitrile butadiene styrene resin (ABS resin), nylon, or the like is applied. Each component will be described below.
[0015]
First, the transport device 2 will be described. This is for conveying the workpiece W from the pretreatment process toward the makeup process, and as an example, holds the workpiece W with a hanger conveyor 21 provided so as to connect the respective processes as shown in FIGS. The work holding member 22 is provided below the hanger conveyor 21 and includes a hooking member 23 for hooking the work holding member 22.
The hanger conveyor 21 includes a rail 24 laid above each process and wheels 25 that roll on the rail 24.
[0016]
The work holding member 22 has a holding portion 27 formed at an appropriate position with respect to a frame mold 26 formed in a rectangular frame shape. In this case, for example, if an attachment hole Wh or the like for the vehicle body or the like is formed in advance in the workpiece W, a configuration in which the holding portion 27 is fitted into the attachment hole Wh to hold the workpiece W is possible. Since the frame body 26 is formed exclusively for each workpiece W having a different shape, a shape detection plate for performing an irradiation operation in accordance with a different surface shape for each workpiece W held. 28 is provided. As shown in FIGS. 2 and 3, for example, each of the workpieces W having different surface shapes has a detection hole 28a opened in an appropriate position pattern. This hole position pattern is formed by a phototube, a proximity switch, or the like. It is sensed and different surface shapes are recognized. Incidentally, in FIG. 2, for the workpiece W positioned on the transfer direction traveling side, two detection holes 28 a are opened at the center of the shape detection plate 28, and for the workpiece W positioned on the other rear side, the shape detection plate Detection holes 28 a are opened at both ends of the 28.
[0017]
As an example, a plurality of the latching members 23 are provided below the wheel 25 so as to have an appropriate interval. Each of the latching members 23 is planarly formed and latches the frame mold body 26 of the workpiece holding member 22. A hook-shaped latching portion 29 is provided. In addition to the form which suspends and conveys the workpiece | work W in this way, the conveying apparatus 2 can take the form etc. which place the workpiece | work W on a roller conveyor, and convey it, for example.
[0018]
Next, the irradiation chamber 3 will be described. This is a portion that irradiates the decorative surface of the workpiece W that has been conveyed with ultraviolet rays. As an example, as shown in FIG. 1, a substantial irradiation space 31, a shutter 32, and an exhaust duct 33 are provided. It is made up of. The irradiation chamber 3 is formed by bending a substantial irradiation space 31, that is, a portion where the irradiation device 4 is disposed in a key shape to prevent direct leakage of ultraviolet rays from the irradiation chamber 3. The shutter 32 is provided and the inside is sealed. Further, the inner wall of the irradiation chamber 3 is painted black to prevent leakage due to irregular reflection of ultraviolet rays. The exhaust duct 33 exhausts ozone generated by ultraviolet rays. In this embodiment, the irradiation chamber 3 is formed in a sealed state by the shutter 32 or the like, but it is not always necessary to form the irradiation chamber 3 in a sealed state.
[0019]
Next, the irradiation apparatus 4 will be described. This comprises a light source unit 41 for irradiating ultraviolet rays and an articulated manipulator 42 that holds the light source unit 41 at the tip and moves it freely along the workpiece surface.
As an example, the light source unit 41 includes a mercury lamp 43 as a light source, a reflector 44 that reflects light emitted from the mercury lamp 43 toward the workpiece W, and a quartz glass 45 that transmits only ultraviolet rays. It consists of. In this embodiment, for the purpose of obtaining the maximum ultraviolet energy, a high-pressure mercury lamp is applied to the mercury lamp 43, and the light emitted radially from the mercury lamp 43 is collected on the reflector 44 at almost one point (focal point). An elliptical parabolic shape that can be illuminated is applied, but besides this, a low-pressure mercury lamp or the like is applied to the light source, and a reflector 44 that reflects the radially emitted light as parallel rays is applied. It is possible. Further, the light source unit 41 is cooled by being filtered air blown from the back surface of the reflector 44 during ultraviolet irradiation.
[0020]
As shown in FIG. 4 as an example, the manipulator 42 includes a horizontally installed base 46, a support column 47 connected to the base 46, a support unit 47 connected to the support unit 47, and the light source unit at the other end. And an arm portion 48 for holding 41. If the three axes orthogonal to each other, that is, the X axis, the Y axis, and the Z axis are set as shown in the figure, the above-described members of the base portion 46, the column portion 47, and the arm portion 48 can rotate in the three-axis direction as a whole. By being configured, the light source unit 41 is moved to an arbitrary position while maintaining a substantially constant interval with respect to the workpiece W, and irradiation is performed from a substantially normal direction of the irradiation action surface. Incidentally, in this embodiment, the support column 47 is composed of two support columns (reference numerals 47A and 47B are assigned from the closest to the base 46), and the support column 47 is rotatable about the Z axis (horizontal). The support column 47B and the arm part 48 are supported rotatably about the X axis, and the light source unit 41 is supported rotatably about the X axis and the Y axis. Yes.
[0021]
Next, an example of the makeup process performed in the latter stage of the makeup pretreatment process will be schematically described. In this process, a so-called hydraulic transfer method is applied. This method floats a transfer film coated with transfer ink on the liquid surface of a transfer tank in which an appropriate liquid is stored, and from above. The work W that has been subjected to the pretreatment is pressed, and transfer ink is printed on the surface of the work W by hydraulic pressure. The makeup is not limited to such a hydraulic pressure transfer method, and various makeups such as painting performed by applying a spray gun for spraying paint in a mist form are possible.
[0022]
Next, the makeup pretreatment method of the present invention will be described while explaining the operation mode of the makeup pretreatment apparatus 1 configured as described above.
(1) Transport of work First, prior to substantial ultraviolet irradiation, the work W is transported to the irradiation chamber 3. At this time, the workpiece W is held by the workpiece holding member 22 by, for example, fitting the holding portion 27 into the mounting hole Wh, and the workpiece holding member 22 is formed integrally with the wheel 25 below the hanger conveyor 21. It is latched by the latching member 23 and conveyed to the irradiation chamber 3 along the rail 24. In this embodiment, the work W is hung on the hanger conveyor 21 via the work holding member 22 between the latching member 23 and the work W. This is because the work W is transferred in the subsequent hydraulic transfer. When immersed in a tank, the workpiece W together with the workpiece holding member 22 can be removed from the hanger conveyor 21. However, for example, if painting can be performed by applying a spray gun or the like without removing the workpiece W from the hanger conveyor 21, a mode in which the workpiece W is directly suspended from the hanger conveyor 21 without applying the workpiece holding member 22 can be adopted.
[0023]
(2) Preparation for ultraviolet irradiation When the workpiece W is transported to the irradiation chamber 3, specifically, to the irradiation space 31 in which the irradiation device 4 is installed, the transport of the workpiece W is temporarily stopped and the shutter 32 at the entrance / exit of the irradiation chamber 3 is stopped. Is closed and sealed. The irradiation space 31 is bent in a key shape, and the inner wall of the irradiation chamber 3 is painted black to prevent direct leakage from the irradiation chamber 3 or leakage due to irregular reflection.
[0024]
(3) Ultraviolet irradiation After completing such preparation, ultraviolet rays are irradiated to the workpiece W. At that time, the light source unit 41 is moved to an arbitrary position by the manipulator 42 so as to maintain a substantially constant distance from the surface of the workpiece W and to maintain a substantially constant speed as shown in FIG. At the same time, the light source unit 41 is set so as to irradiate the irradiation surface of the workpiece W substantially from the normal direction. In order to control the irradiation distance substantially constant, for example, after moving the workpiece W to an appropriate position in the irradiation space 31, the manipulator 42 is remotely operated on the spot, and the workpiece W is separated from the surface of the workpiece W by a certain distance. While setting a plurality of plot points, the position data is sequentially stored, a smooth curve connecting almost all stored plot points is determined, and the irradiation unit 41 is moved along the curve to irradiate ultraviolet rays. Is to do. Accordingly, in the embodiment shown in FIG. 5, the workpiece W is irradiated with ultraviolet rays in a substantially vertical direction. However, for example, other forms such as irradiation with ultraviolet rays in various directions such as the horizontal direction can be adopted.
[0025]
In this embodiment, the workpiece W is temporarily stopped and only the light source unit 41 is moved to perform ultraviolet irradiation. For example, when the light source unit 41 is fixed and passes through the irradiation space 31. The workpiece W can be appropriately moved three-dimensionally with respect to the light source unit 41. Alternatively, the workpiece W is set so as to continue to move linearly along the rail 24, and the light source unit 41 is appropriately A configuration in which the workpiece W and the light source unit 41 are both moved is also possible. At that time, in any form, the relative irradiation distance and irradiation speed between the light source unit 41 and the workpiece W are maintained substantially constant, and ultraviolet rays are irradiated from the normal direction of the irradiation action surface .
Thereafter, the workpiece W that has been irradiated with ultraviolet rays is conveyed to a makeup process, and makeup such as painting or printing is applied to the surface.
[0026]
【The invention's effect】
First, according to the first or fifth aspect of the invention, during irradiation with ultraviolet rays, the irradiation distance and moving speed between the light source unit 41 and the workpiece W are maintained, and irradiation is performed from a direction substantially normal to the irradiation action portion. Even if the workpiece W has an indefinite curved surface and is formed in a relatively large size, it is possible to uniformly irradiate the workpiece surface with ultraviolet rays. Moreover, not only the form which fixes the workpiece | work W and moves the light source unit 41 but various irradiation forms, such as the form which fixes the light source unit 41 and moves the workpiece | work W, can be taken.
[0027]
According to the invention of claim 2, 3, 6 or 7 , a specific structure for uniformly irradiating the work surface with ultraviolet rays is made possible.
[0028]
According to the invention described in claim 4 or 8 , a complicated transfer pattern can be printed more stably even on the workpiece W forming a complicated three-dimensional curved surface.
[Brief description of the drawings]
FIG. 1 is a plan view showing a state in which a makeup pretreatment apparatus of the present invention is incorporated in a preceding stage of a hydraulic pressure transfer process, and a perspective view showing an irradiation apparatus.
FIG. 2 is an explanatory view showing a transport device.
FIG. 3 is an explanatory diagram illustrating a state in which a workpiece is attached to the transfer device.
FIG. 4 is a perspective view showing an irradiation apparatus.
FIG. 5 is an explanatory diagram showing an irradiation mode of ultraviolet rays on a workpiece.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Makeup pretreatment apparatus 2 Conveyance apparatus 3 Irradiation chamber 4 Irradiation apparatus 21 Hanger conveyor 22 Work holding member 23 Hanging member 24 Rail 25 Wheel 26 Frame type body 27 Holding part 28 Shape detection plate 28a Detection hole 29 Hanging part 31 Irradiation space 32 Shutter 33 Exhaust Duct 41 Light Source Unit 42 Manipulator 43 Mercury Lamp 44 Reflector 45 Quartz Glass 46 Base 47 Column 47A Column 47B Column 48 Arm Unit W Work Wh Mounting Hole

Claims (8)

For a work (W) formed from an appropriate resin material so as to have an indefinite curved surface, prior to applying makeup, a method of performing pretreatment by ultraviolet irradiation,
The ultraviolet irradiation keeps the irradiation distance between the light source unit (41) and the workpiece (W) that irradiates ultraviolet rays substantially constant, and the relative moving speed between the light source unit (41) and the workpiece (W) is also almost constant. A makeup pretreatment method for an indefinite curved surface workpiece, wherein ultraviolet rays are irradiated from the normal direction of the irradiation action portion of the workpiece (W) in a state of being maintained constant . The ultraviolet irradiation, to set in the fixed state the workpiece (W), indeterminate curved workpiece according to claim 1, wherein the light source unit (41) is characterized by being performed while moving along the workpiece (W) surface Makeup pretreatment method. The said ultraviolet irradiation is performed before makeup | decoration of the indefinite curved surface workpiece | work of the said workpiece | work (W) suitably moving three-dimensionally with respect to the light source unit (41) set to the fixed state. Processing method. The makeup, makeup pretreatment method indeterminate curved workpiece according to claim 1, 2 or 3, wherein the a liquid pressure transfer. A light source unit (41) that irradiates ultraviolet rays prior to performing makeup on a workpiece (W) formed from an appropriate resin material so as to have an indefinite curved surface, and an irradiation chamber in which the light source unit (41) is installed (3) In a device that irradiates the work (W) with ultraviolet rays at the stage before makeup,
Said light source unit (41), together with the irradiation distance between the workpiece (W) is maintained substantially constant, with the relative movement speed is maintained substantially constant between the workpiece (W), the workpiece (W) An apparatus for pre-decorating a surface of an indefinite curved surface , wherein the workpiece (W) is irradiated with ultraviolet rays from the normal direction of the irradiation action portion in the case. The makeup pretreatment apparatus for an indefinite curved surface workpiece according to claim 5, wherein the light source unit (41) irradiates ultraviolet rays while moving along the surface of the workpiece (W) set in a fixed state. 6. The pre-makeup process for an indefinite curved surface workpiece according to claim 5, wherein the workpiece (W) is irradiated with ultraviolet rays while appropriately moving three-dimensionally with respect to the light source unit (41) set in a fixed state. apparatus. 8. The makeup pretreatment apparatus for an indefinite curved surface workpiece according to claim 5, 6 or 7 , wherein the makeup is hydraulic pressure transfer.

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