JP2008307713A - Processing method of irregular pattern on surface of mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a processing method of irregular patterns on the surface of a mold, which allows large reduction in time required for forming anti-corrosion film, in its turn, time required for forming the irregular patterns. <P>SOLUTION: This invention relates to the processing method of fine irregular patterns consisting of protruded and recessed parts on the surface of a mold, wherein the anti-corrosion film 34 is formed on the parts where the protruded parts of the irregular patterns is to be formed for the surface (inner bottom face 27 of a molded recessed part 22 in a movable mold 21) of the mold, exposed parts not coated with the anti-corrosion film 34 for the surface (inner bottom face 27) are corroded and removed by etching, and the anti-corrosion film 34 is dissolved and removed by washing. The anti-corrosion film 34 is formed by spraying a solvent 61 for forming the anti-corrosion film from nozzles 48 of an ink head 47 for ink-jetting, and attaching the solvent 61 to the parts where the protruded parts of the irregular patterns is to be formed for the surface (inner bottom face 27). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method of processing a fine uneven pattern such as a texture pattern on the surface of a mold.

  As one aspect of automobile interior parts, etc., there is one in which most of the surface is formed of a synthetic resin, and a fine uneven pattern such as a grain pattern or a wood grain pattern is expressed (reproduced) on the surface of the synthetic resin. . This concavo-convex pattern is formed together during resin molding of automobile interior parts. That is, when a mold having an uneven pattern on the surface is used and the cavity is filled with the molten resin, the uneven pattern on the mold surface is transferred to the molten resin. By this transfer, a concavo-convex pattern having a concavo-convex relationship opposite to the concavo-convex pattern of the mold is formed on the surface of the automobile interior product.

The concavo-convex pattern is roughly formed on the surface of the mold through the following steps 1 to 4.
Step 1: Oil, dust, etc. adhering to the surface of the mold are removed by washing.
Process 2: On the surface of a metal mold | die, anticorrosion processing is performed with respect to the place where the projection part of an uneven | corrugated pattern is to be formed. More specifically, a corrosion-resistant film that is not corroded by the etching solution and is soluble in the cleaning solution is formed at the same location.

  Step 3: On the surface of the mold, the exposed portion of the surface that is not covered with the corrosion-resistant film is removed by corrosion with an etching solution. On the surface of the mold, the portion removed by corrosion as described above becomes a concave portion having a concave and convex pattern.

Step 4: The above-mentioned corrosion-resistant film is dissolved and removed by the cleaning liquid, and this portion becomes a projection with an uneven pattern.
As a method for forming a corrosion-resistant film in the above step 2, a photosensitive type, a transfer type, and the like are known. For example, in the former method (photosensitive method), a resist (photosensitive agent having acid resistance) is applied to the mold surface. A pattern film having holes at positions corresponding to the projections of the concavo-convex pattern is prepared. When light is irradiated to the resist through the hole portion of the pattern film, the portion irradiated with light in the resist is exposed. Further, by washing with water, the unexposed portions of the resist are dissolved and removed to expose the mold surface, while the exposed portions remain on the mold surface as the corrosion-resistant film.

  In the latter method (transfer method), for example, as described in Patent Document 1, an acid-resistant resist that is soluble in a predetermined solvent is used, and a second resist pattern having an arbitrary pattern is printed on the transfer paper. Is done. A first resist pattern different from the second resist pattern is printed on the transfer paper using an acid resistant resist insoluble in a predetermined solvent. Then, the two resist patterns printed on the transfer paper are transferred to the mold surface.

In addition, when providing a height difference in an uneven | corrugated pattern, the process of the said process 1-process 4 is performed repeatedly.
JP-A-9-26397

  However, in the conventional method for processing a concavo-convex pattern, a large amount of time must be passed as described above, regardless of whether the method is a photosensitive type or a transfer type. What you need is the reality.

  In particular, when processing a concavo-convex pattern having a height difference, a series of processes from Step 1 to Step 4 including Step 2 consisting of the above-described many processes are repeated, so the time required for processing the concavo-convex pattern is long. It gets even longer.

  The present invention has been made in view of such circumstances, and its purpose is to provide a mold surface that can significantly reduce the time required to form a corrosion-resistant film, and thus the time required to form an uneven pattern. The object is to provide a method for processing an uneven pattern.

  In order to achieve the above object, the invention according to claim 1 is a method of processing a fine concavo-convex pattern consisting of protrusions and recesses on the surface of a mold, and the concavo-convex pattern on the surface of the mold. After the portion where the protrusions are to be formed is coated with a corrosion-resistant coating that has corrosion resistance and is soluble in the cleaning solution, the portion that is not coated with the corrosion-resistant coating on the surface is removed by corrosion with an etching solution, In the method for processing the concavo-convex pattern on the mold surface by dissolving and removing the corrosion-resistant film with the cleaning liquid, the corrosion-resistant film is formed from an inkjet nozzle when forming the corrosion-resistant film. The gist is to inject a solvent for use and to attach the solvent to a portion where the projections of the concavo-convex pattern are to be formed on the surface.

  Here, as the concavo-convex pattern, a wrinkle pattern, a so-called wrinkle pattern, which is seen on the surface of leather, is typical. ) Is also included in the uneven pattern.

  According to the above processing method, when a part of the surface of the mold (the place where the projections and recesses of the concavo-convex pattern are to be formed) is covered with the corrosion resistant film, the solvent is sprayed from the inkjet nozzle. This solvent adheres to the location where the projections and recesses on the surface of the mold are to be formed with high precision, and a corrosion-resistant film having a desired shape is formed at the same location. The said part is coat | covered with this corrosion-resistant film.

  Subsequently, on the surface of the mold, a portion exposed without being covered with the corrosion-resistant film is removed by corrosion with an etching solution to form a depression. At this time, the corrosion-resistant film protects the portion where the projections and recesses of the concavo-convex pattern are to be formed from corrosion by the etching solution. Concave and convex recesses are formed by the depressions on the mold surface. Thereafter, the corrosion-resistant film on the protrusion is dissolved and removed by the cleaning liquid. On the surface of the mold, the protrusions having the concavo-convex pattern are constituted by the portions where the corrosion-resistant coating is dissolved and removed. In this way, an uneven pattern is formed on the mold surface.

  In the above-described series of steps for processing the concavo-convex pattern, in order to form a corrosion-resistant film that conventionally required many treatments, in the invention according to claim 1, a solvent is jetted from an inkjet nozzle, and this is applied to the mold surface. It is only necessary to attach it to the part where the projections and depressions of the uneven pattern are to be formed. Therefore, the time required for forming the corrosion-resistant film can be shortened, and thus the overall time required for forming the uneven pattern can be greatly shortened.

  According to a second aspect of the present invention, in the first aspect of the invention, when the corrosion removal by the etching solution is performed, the etching solution is sprayed from an inkjet nozzle, and the etching solution is coated on the surface with the corrosion-resistant film. The main point is to attach it to the exposed part.

  According to the above processing method, the etching solution is ejected from the nozzle of the ink jet when removing the corrosion by the etching solution. This etching solution adheres to the exposed portions of the mold surface without being covered with the corrosion-resistant film. With this adhering etching solution, only the exposed portion of the mold surface is removed by corrosion to form a recess, thereby forming a recess having an uneven pattern.

  As described above, the corrosion removal by the etching solution can also be realized by spraying the etching solution from the inkjet nozzle. In addition to the time required for forming the corrosion-resistant film, the time required for removing the corrosion can be shortened, and the overall time required for forming the uneven pattern can be further reduced. In addition, since the etching solution is attached only to a portion related to the corrosion removal on the mold surface, that is, only to a necessary portion, there is an effect that unnecessary consumption of the etching solution can be suppressed.

  The invention described in claim 3 is characterized in that, in the invention described in claim 2, when the corrosion removal by the etching solution is performed, the etching solution is sprayed from a nozzle formed of a material having corrosion resistance to the etching solution. And

  According to the above processing method, when the corrosion solution is removed by the etching solution, the etching solution passes through the nozzle formed of the material having corrosion resistance against the etching solution. For this reason, the nozzle is less susceptible to corrosion by the etchant than when the nozzle is formed of a material different from such a material.

  The invention according to claim 4 changes the relative position of the mold with respect to the nozzle in the invention according to any one of claims 1 to 3 by displacing both the nozzle and the mold. Thus, the gist is to maintain a substantially constant distance from the nozzle to the surface of the mold, and to perform injection from the nozzle in this state.

  According to the above processing method, when the solvent (Claim 1) or the etching liquid (Claims 2 and 3) is ejected from the inkjet nozzle, the relative position of the mold with respect to the nozzle is changed. Thus, the distance from the nozzle to the surface of the mold is maintained substantially constant. For this reason, the solvent or the etching solution is always ejected from the nozzle located at a location that is separated from the mold surface by a substantially constant distance. As a result, the solvent or the etching solution can be reliably attached to the intended location even if the location to be processed with the uneven pattern on the mold surface is not a flat surface.

  Further, when changing the relative position, both the nozzle and the mold are displaced. Therefore, the relative position can be changed by slowly displacing the mold as compared with the case where the nozzle is fixed and only the mold is displaced. It becomes possible to attach a solvent or an etching solution to the surface with high accuracy not only for a small mold but also for a large mold.

  According to the processing method of the present invention, it is possible to form a corrosion-resistant film by a simple process such as spraying a solvent from an inkjet nozzle, greatly increasing the time required for forming the corrosion-resistant film, and hence the time required for forming the uneven pattern. Can be shortened.

(First embodiment)
Hereinafter, a first embodiment in which the present invention is embodied in a method of processing a fine concavo-convex pattern on a surface of a mold for molding an automobile interior product will be described with reference to FIGS.

  First, an automotive interior product molded by a mold will be described. The interior parts for automobiles are the interior parts that are attached to the vehicle. The interior surface of the design surface has an uneven pattern consisting of fine protrusions and recesses, such as a texture pattern (leather pattern), a wood grain pattern, and a satin pattern. It is what you have. For example, a console lid (cover for armrest, accessory case, etc.), a center console, an armrest, etc. correspond to this. Here, as shown in at least one of FIG. 1 and FIG. 2, a description will be given by taking as an example a console lid 11 in which a concavo-convex pattern 13 made of a texture pattern is provided on the upper surface 12. The upper surface 12 of the console lid 11 has a convex curved surface that slightly bulges upward so that the central portion in the width direction is the highest. The concavo-convex pattern 13 on the upper surface 12 includes a plurality of protrusions 14 and a plurality of recesses 15 that are about 40 to 80 μm lower than the top of the protrusion 14.

  The concavo-convex pattern 13 in the console lid 11 (i) imparts a three-dimensional texture to the upper surface 12 thereof, (ii) makes the upper surface 12 difficult to be scratched, or makes it inconspicuous even if scratched (iii) ) It is formed for the purpose of making the upper surface 12 difficult to slip.

  The console lid 11 is molded by an injection molding die 16 shown in FIG. The metal mold 16 includes a fixed mold 17 indicated by a two-dot chain line in FIG. 3 and a movable mold 21 indicated by a solid line in FIG. The movable mold 21 is provided so as to be movable in the vertical direction in FIG. 3, and is configured to contact the fixed mold 17 by moving upward and to be separated from the fixed mold 17 by moving downward. Yes. The fixed mold 17 and the movable mold 21 are all made of steel, zinc alloy, aluminum alloy or the like.

  The fixed mold 17 is provided with a molding protrusion 18, and the movable mold 21 is provided with a molding recess 22. When the movable mold 21 is in contact (clamping) with the fixed mold 17, the molding projection 18 enters the molding recess 22, and the console lid 11 is molded between the molding projection 18 and the molding recess 22. A cavity 23 is formed as a space for this purpose. When the cavity 23 is filled with a molten resin and cooled and cured, the desired console lid 11 is molded in an upside down manner with respect to FIG.

  Next, the molding recess 22 of the movable mold 21 will be described with reference to FIGS. 4 and 5, in order to specify the direction, the direction connecting the lower right portion and the upper left portion in FIGS. 4 and 5 is referred to as the “X direction”, and the upper right portion and the lower left portion are The direction connecting the two is called the “Y direction”, and the vertical direction is called the Z direction. The X direction and the Y direction are both aspects of the horizontal direction, and the Z direction is the vertical direction.

  The molding recess 22 is open on the upper surface 24 of the movable mold 21. The molding recess 22 is slightly longer in the X direction than in the Y direction and has a shallow shape in the Z direction. Both inner side surfaces 25, 25 in the Y direction of the molding recess 22 and both inner side surfaces 26, 26 in the X direction are configured by flat surfaces. On the other hand, the inner bottom surface 27 for forming the upper surface 12 of the console lid 11 in the molding recess 22 is deepest at the intermediate portion in the Y direction and becomes deeper as it approaches both inner side surfaces 25, 25 in the Y direction. A concave curved surface that swells slightly downward is formed so as to be shallow. The inner bottom surface 27 and the inner side surfaces 25, 26 of the molding recess 22 form part of the surface of the movable mold 21.

  On the inner bottom surface 27 of the molding recess 22, when the console lid 11 is injection-molded using the mold 16, a concavo-convex pattern 31 is provided to transfer the concavo-convex pattern 13 to the upper surface 12 of the console lid 11. Yes. As shown in FIGS. 2 and 10, the uneven pattern 31 includes a protrusion 32 for forming the recess 15 and a recess for forming the protrusion 14 in the uneven pattern 13 on the upper surface 12 of the console lid 11. 33 are provided in large numbers.

The concavo-convex pattern 31 is formed on the inner bottom surface 27 of the molding recess 22 in the movable die 21 through the following steps 1 to 4.
Step 1: As shown in FIG. 6, dirt components such as oils and fats adhering to the surface of the movable die 21 (at least the inner bottom surface 27 of the molding recess 22) are removed by degreasing cleaning. This treatment is performed to prevent the adhesion of the corrosion-resistant film 34 to the inner bottom surface 27 in step 2 described later from being deteriorated due to the dirt component. This step 1 includes not only cleaning with a cleaning liquid but also ancillary processing such as water washing and drying.

  Step 2: As shown in FIG. 7, the inner bottom surface 27 of the molding recess 22 is not corroded by the etching solution (has corrosion resistance) at the portion where the projection 32 of the concavo-convex pattern 31 is to be formed, and will be described later. A corrosion-resistant film 34 that is soluble in the cleaning liquid in step 4 is formed. This portion is covered with the corrosion-resistant coating 34.

  Step 3: As shown in FIG. 8, the portion of the inner bottom surface 27 of the molding recess 22 that is exposed without being covered with the corrosion-resistant coating 34 is corroded and removed by the etching solution to become a recess 35. As the etching solution, for example, when the movable mold 21 is formed of a steel material, nitric acid to which an additive is added is suitable. Further, when the movable mold 21 is formed of a copper-based or zinc-based metal material, a ferric chloride solution to which an additive is added is suitable as an etching solution. The corrosion removal by the etching solution can be performed, for example, by immersing the movable mold 21 in the etching solution and stirring.

  When removing the corrosion with the etching solution, as shown in FIG. 9, the corrosion-resistant film 34 protects the portion where the projections 32 of the concavo-convex pattern 31 are to be formed from the removal by the etching solution. Therefore, the portion of the inner bottom surface 27 of the molding recess 22 that is covered with the corrosion resistant film 34 remains without being removed by corrosion. And the recessed part 33 of the uneven | corrugated pattern 31 is comprised by the location used as the said hollow 35 in the inner bottom face 27 of the shaping | molding recessed part 22. FIG.

  Step 4: As shown in FIG. 10, the corrosion-resistant film 34 is dissolved and removed by the cleaning liquid. On the inner bottom surface 27, the portion dissolved and removed by the cleaning liquid as described above becomes the protrusion 32 of the concavo-convex pattern 31.

  In the series of steps described above, the contents of step 1, step 3 and step 4 are the same as in the prior art. In 1st Embodiment, the content of the process 2 differs greatly from the past. In carrying out this step 2, an apparatus 41 shown in FIGS. 4 and 5 is used.

  A gate-shaped frame 43 is erected on the table 42 of the apparatus 41. The frame 43 has a pair of columns 44 and 44 on the table 42 at locations spaced apart from each other in the Y direction. A first cross rail 45 is supported between both columns 44 and 44 on the frame 43. A first moving mechanism (not shown) that moves the first cross rail 45 in the Y direction (horizontal direction) relative to the frame 43 is provided between the frame 43 and the first cross rail 45.

  A second cross rail 46 is supported near the side of the first cross rail 45. Between the first and second cross rails 45, 46, a second moving mechanism (not shown) that moves the second cross rail 46 in the X direction (horizontal direction) relative to the first cross rail 45 is provided.

  Further, an ink head 47 for inkjet is supported on the second cross rail 46. A third moving mechanism (not shown) for moving the ink head 47 in the Z direction (vertical direction) relative to the second cross rail 46 is provided between the second cross rail 46 and the ink head 47.

  The ink head 47 has a solvent storage chamber (not shown) for storing the solvent for forming the corrosion-resistant film, and an opening of the solvent storage chamber, and a plurality of nozzles exposed on the bottom surface of the ink head 47. A group 48 (see FIG. 7) is provided. In the ink head 47, the piezoelectric element constituting the solvent storage wall is vibrated, and solvent droplets are ejected downward from each nozzle of the nozzle group 48. There are various methods for driving the nozzles in the ink head 47, such as a pressure pulse method and a charge control method. The operation of the ink head 47 (piezoelectric element) described above is controlled by a controller (not shown). A region where the solvent can be sprayed and attached from the nozzle group 48 at a time is narrower than the inner bottom surface 27 of the molding recess 22.

  In addition, each 1st-3rd moving mechanism mentioned above can be comprised by a motor, a ball screw, etc., for example. By operating each of these moving mechanisms, the ink head 47 can be linearly moved in the X direction, the Y direction, and the Z direction.

  A flat base 51 is fixed on the table 42. On the base 51, a pair of first bearings 52 and 52 are provided at locations separated from each other in the Y direction. A flat first rotating plate 53 is disposed between the first bearings 52 and 52. First shafts 54 and 54 are respectively fixed to both side surfaces of the first rotating plate 53 in the Y direction. In these first shafts 54 and 54, the first rotating plate 53 is connected to the first bearings. 52 and 52 are rotatably supported. One of the first shafts 54 and 54 is drivingly connected to a first motor 55 fixed on the base 51. By the first motor 55, it is possible to rotate the first rotation plate 53 around both the first shafts 54 and 54 and adjust the inclination thereof.

  On the first rotating plate 53, a pair of second bearings 56, 56 are provided at locations separated from each other in the X direction. A second rotating plate 57 is disposed between the second bearings 56 and 56. Second shafts 58 and 58 are fixed to both side surfaces of the second rotating plate 57 in the X direction, respectively. In these second shafts 58 and 58, the second rotating plate 57 is connected to the second bearings. 56 and 56 are rotatably supported. One of these second shafts 58 and 58 is drivingly connected to a second motor 59 fixed on the first rotating plate 53. By this second motor 59, it is possible to rotate the second rotating plate 57 around both the second shafts 58, 58 and adjust the inclination thereof.

A gripping device (not shown) is provided on the second rotating plate 57, and the movable die 21 is fixed to the second rotating plate 57 via the gripping device.
The device 41 further includes a control device (not shown) configured around a microcomputer. A control program for controlling each operation (position, speed, etc.) of the first to third moving mechanisms, the first motor 55, and the second motor 59 is stored in the memory of the control device. And a control apparatus controls the action | operation of each moving mechanism and the motors 55 and 59 according to this control program.

  In response to this control, the respective moving mechanisms and the motors 55 and 59 are operated, whereby the ink head 47 is moved in at least one of the X direction, the Y direction, and the Z direction when the solvent is ejected. Further, the movable mold 21 is rotated around at least one of the first shaft 54 and the second shaft 58. By these movement and rotation, the distance D (see FIG. 7) from the lower end of the nozzle group 48 to the inner bottom surface 27 of the molding recess 22 is maintained at a predetermined value. The predetermined value here is set to a value that does not cause the uneven pattern to blur or blur with respect to the distance D.

When performing step 2 using the apparatus 41, the movable mold 21 is mounted on the second rotating plate 57 so that the longitudinal direction thereof coincides with the X direction.
Next, since the inner bottom surface 27 of the movable mold 21 is a concave curved surface that slightly swells downward, the second motor 59 slowly rotates the second rotation plate 57 around the second shaft 58. Further, as shown in FIG. 7, the first mechanism adjusts the position of the ink head 47 in the Z direction by the third mechanism so that the distance D from the lower end of the nozzle group 48 to the inner bottom surface 27 becomes the predetermined value. The first cross rail 45 is moved in the Y direction by the mechanism. In this state, the solvent 61 for forming the corrosion-resistant film is sprayed downward from the nozzle group 48. The solvent 61 is made of a liquid that is not corroded by the etching solution and is soluble in the cleaning solution. The solvent 61 adheres to the location where the protrusions 32 of the concavo-convex pattern 31 are to be formed on the inner bottom surface 27 of the movable mold 21.

  Here, when the solvent 61 is injected, the relative position of the movable mold 21 with respect to the nozzle group 48 is changed as described above, so that the distance D from the lower end of the nozzle group 48 to the inner bottom surface 27 of the molding recess 22 is substantially reduced. Maintained constant. For this reason, the solvent 61 is always sprayed from the nozzle group 48 located at a position away from the inner bottom surface 27 of the molding recess 22 by a substantially constant distance D. As a result, the inner bottom surface 27 of the molding recess 22 is not flat (is a curved surface), but the solvent 61 is reliably attached to the intended location.

  When the solvent 61 adhering to the inner bottom surface 27 is dried, the corrosion-resistant film 34 is neatly formed in a desired shape on the portion where the projections 32 of the uneven pattern 31 are to be formed on the inner bottom surface 27 of the movable mold 21. As a result, the same portion is covered with the corrosion-resistant coating 34.

The process of spraying the solvent 61 from the nozzle group 48 while displacing the ink head 47 and the movable mold 21 may be performed a plurality of times until the corrosion-resistant film 34 has a predetermined thickness.
Then, when the corrosion-resistant film 34 is formed as described above, the process 2 is finished, and the process proceeds to the process 3 (corrosion removing process using an etching solution).

According to the first embodiment described in detail above, the following effects can be obtained.
(1) Unlike the prior art which requires a lot of processing for forming the corrosion resistant film 34, in the first embodiment, the solvent 61 is ejected from the nozzle group 48 of the ink head 47 in the ink jet, and the solvent 61 is moved. It is only necessary to attach the inner bottom surface 27 of the molding recess 22 in the mold 21 to the portion where the projection 32 of the concavo-convex pattern 31 is to be formed. For this reason, the time required for forming the corrosion-resistant film 34 can be shortened, and thus the overall time required for forming the uneven pattern 31 can be greatly shortened.

  (2) By changing the relative position of the movable die 21 with respect to the nozzle group 48, the distance D from the lower end of the nozzle group 48 to the inner bottom surface 27 of the molding recess 22 is maintained substantially constant. The solvent 61 is jetted. For this reason, although the part to which the concavo-convex pattern 31 is attached in the movable mold 21 is the inner bottom surface 27 curved in a concave shape so as to slightly swell downward, the solvent 61 can be reliably attached to the intended part.

  (3) When changing the relative position, as described in, for example, Japanese Patent Laid-Open No. 5-293955, it is conceivable that the ink head 47 is fixed and only the movable die 21 is displaced. In this case, when the movable mold 21 is small, the solvent 61 can be attached to the inner bottom surface 27 of the molding recess 22 with high accuracy. However, when the movable mold 21 is large, there is a limit to the displacement of the movable mold 21 at high speed with high accuracy. As a result, it becomes difficult to ensure the adhesion (printing) accuracy of the solvent 61 equivalent to that of the small movable mold 21.

  In this regard, in the first embodiment, both the ink head 47 and the movable mold 21 are displaced when the relative position is changed. Therefore, the relative position can be changed by slowly displacing the movable die 21 as compared with the case where the ink head 47 is fixed and only the movable die 21 is displaced. The solvent 61 can be attached with high accuracy not only to the small movable mold 21 but also to the large movable mold 21.

  (4) In the first embodiment, the case where the corrosion-resistant film 34 is formed only on the inner bottom surface 27 of the molding recess 22 has been described as an example. However, if the apparatus 41 is used, the inside of the molding recess 22 in addition to the inner bottom surface 27 is described. It is also possible to form a corrosion-resistant film 34 on the side surfaces 25 and 26. This is centered on two axes orthogonal to each other (the first shaft 54 and the second shaft 58), and the movable die 21 is rotated around these axes, and the ink head 47 is moved in the X-axis direction and the Y-axis direction. This is because the distance D from the nozzle group 48 to the inner side surfaces 25 and 26 can be maintained substantially constant by displacing in the Z-axis direction.

  Therefore, the solvent 61 is sprayed from the nozzle group 48 located at a position away from the inner surfaces 25 and 26 by a predetermined distance D, and for any portion of the target inner surfaces 25 and 26, The solvent 61 surely adheres to a portion that is to become the protrusion 32 of the uneven pattern 31.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG.
The second embodiment is different from the first embodiment using the ink jet only for the step 2 in that the corrosion removal by the etching solution in the step 3 is performed using the ink jet among the series of processes for the processing of the uneven pattern 31 described above. Is different.

  This step 3 is performed using at least an ink head 62 different from the ink head 47 used in step 2. For the components other than the ink head 62 of the apparatus 41, those used in step 2 may be used as they are. In this case, the ink head 47 is replaced with the ink head 62 when the process 2 is shifted to the process 3. Instead, when the step 3 is performed, another device (which uses the ink head 62) having substantially the same configuration as the device 41 used in the step 2 may be used. Regardless of which change is made, an ink head 62 in which a nozzle group 64 formed of a material having corrosion resistance to the etching solution is incorporated is used. As such a material, for example, inorganic materials such as ceramics and glass are suitable. Unlike the solvent, an etching solution 63 is stored in the solvent storage chamber of the ink head 62. In the ink head 62, the piezoelectric element constituting the solvent storage wall is vibrated, and droplets of the etching solution 63 are jetted downward from each nozzle.

The contents of step 3 are the same as those of step 2 except for the following two points.
Difference 1: The type of liquid ejected from the nozzle group 64 is changed from the solvent 61 to the etching solution 63.

  Difference 2: The portion of the inner bottom surface 27 of the molding recess 22 where the etching solution 63 is attached is exposed without being covered with the corrosion-resistant coating 34 on the inner bottom surface 27 from the portion where the projection 32 of the concavo-convex pattern 31 is to be formed. The point that replaces the part you are doing.

  Note that the point of maintaining the distance D from the nozzle group 64 to the inner bottom surface 27 at a predetermined value when the etching solution 63 is sprayed is the same as in Step 2. At this time, the first rotating plate 53 (movable mold 21) is rotated around the first shafts 54 and 54 through the control of the first motor 55. Through the control of the second motor 59, the second rotating plate 57 (movable mold 21) is rotated around the second shaft 58. Through each control of the first to third moving mechanisms, the movement of the first cross rail 45 in the Y direction, the movement of the second cross rail 46 in the X direction, and the position adjustment of the ink head 47 in the Z direction are performed.

  For this reason, the etching solution 63 is always sprayed from the nozzle group 64 located at a location away from the inner bottom surface 27 of the molding recess 22 by a substantially constant distance D. As a result, the etching solution 63 reliably adheres to the intended location of the molding recess 22 (inner bottom surface 27, inner surface 25, 26).

  At least the etching solution 63 adhering to the inner bottom surface 27 corrodes only the exposed portion of the inner bottom surface 27 that is not covered with the corrosion-resistant film 34, thereby forming a recess 35, and the recess 33 of the uneven pattern 31 is formed.

The process of ejecting the etching solution 63 from the nozzle group 64 while displacing the ink head 62 and the movable mold 21 may be performed a plurality of times until the recess 35 reaches a predetermined depth.
And if the hollow 35 is formed in the inner bottom face 27 as mentioned above, the process 3 will be complete | finished and it will transfer to the process 4 (cleaning process).

According to 2nd Embodiment explained in full detail above, the following effect is acquired in addition to (1)-(4) mentioned above.
(5) During the corrosion removal by the etching solution 63, the etching solution 63 is sprayed from the nozzle group 64 of the ink head 62, and the etching solution 63 is exposed without being covered with the corrosion resistant film 34 on the inner bottom surface 27 of the molding recess 22. It is made to adhere only to the location. For this reason, in addition to the time required for forming the corrosion-resistant film 34 described above, the time required for removing the corrosion by the etching solution 63 can also be reduced, and the overall time required for forming the uneven pattern 31 can be further reduced. Can do. Further, since it is only necessary to attach the etching solution 63 only to the portion related to the corrosion removal in the molding recess 22 of the movable die 21, that is, only the necessary portion, the unnecessary consumption of the etching solution 63 can be suppressed.

Note that the present invention can be embodied in another embodiment described below.
In changing the relative position of the movable mold 21 with respect to the nozzle groups 48 and 64, the ink heads 47 and 62 are moved only in the horizontal direction (X direction, Y direction), and the mold (movable mold 21) is moved in the vertical direction (Z Direction). Alternatively, the ink heads 47 and 62 may be moved only in the Y direction, and the mold (movable mold 21) may be moved in the X direction and the vertical direction (Z direction).

  The distance D from the nozzle groups 48 and 64 to the surface of the mold (the inner bottom surface 27 and the inner side surfaces 25 and 26 of the movable mold 21) does not necessarily have to be maintained at a strictly constant value (predetermined value). It may be kept substantially constant.

  The movable mold 21 has a posture different from that of the above embodiment, for example, the inner surface 26, 26 is parallel to the Y direction and the inner surface 25, 25 is parallel to the X direction. You may wear it.

The present invention can be applied to the case where the fine uneven pattern 31 is processed on the surface of the fixed mold 17 instead of or in addition to the movable mold 21.
The present invention can be widely applied to the case of processing a fine concavo-convex pattern in a mold for molding vehicle parts other than automobile interior parts and resin products used for applications other than vehicles.

In addition, the technical ideas that can be grasped from the respective embodiments will be described together with their effects.
(A) In the method of processing a concavo-convex pattern on the mold surface according to claim 4, the nozzle is linearly moved back and forth in the horizontal direction and the vertical direction, and the mold is rotated.

  In this way, the mold with respect to the nozzle is maintained while maintaining the distance from the nozzle to the surface of the mold substantially constant by the horizontal and vertical linear movements of the inkjet nozzle and the rotational movement of the mold. The relative position of can be changed reliably.

Sectional drawing of the console lid in 1st Embodiment which actualized this invention. Sectional drawing which expands and shows the uneven | corrugated pattern in the upper surface of a console lid. Sectional drawing which shows the metal mold | die used for shaping | molding of a console lid. The fragmentary perspective view which shows the apparatus used for formation of a corrosion-resistant film in the case of an uneven | corrugated pattern process. The fragmentary perspective view which expands and shows the A section in FIG. Sectional drawing which shows a movable mold | type after the process 1 was performed. Sectional drawing which shows the state in which a solvent is injected toward the inner bottom face of a shaping | molding recessed part from the nozzle of an inkjet. Sectional drawing which shows the state before the corrosion-resistant film | membrane is not formed but the location exposed by the inner bottom face of a shaping | molding recessed part is corroded. FIG. 9 is a cross-sectional view showing a state where the inner bottom surface is further removed by corrosion from FIG. 8. Sectional drawing which shows the state by which the corrosion-resistant film | membrane was melt | dissolved and removed from the inner bottom face by washing | cleaning. It is a figure which shows 2nd Embodiment which actualized this invention, and is sectional drawing which shows the state in which etching liquid is injected toward the inner bottom face of a shaping | molding recessed part in the case of implementation of the process 3. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 16 ... Metal mold | die, 21 ... Movable type | mold, 27 ... Inner bottom surface (it comprises some surface of a metal mold | die), 31 ... Concave and convex pattern, 32 ... Protrusion part, 33 ... Concave part, 34 ... Corrosion-resistant film, 48, 64 ... Nozzle Group, 61 ... solvent, 63 ... etchant, D ... distance.

Claims (4)

It is a method of processing a fine concavo-convex pattern consisting of protrusions and recesses on the surface of a mold,
Locations where the projections of the concavo-convex pattern are to be formed on the surface of the mold are coated with a corrosion-resistant coating that has corrosion resistance and is soluble in a cleaning solution, and the surface is not coated with the corrosion-resistant coating In the method for processing a concavo-convex pattern on the surface of a mold in which the concavo-convex pattern is formed on the surface by dissolving and removing the corrosion-resistant film with the cleaning liquid,
In forming the corrosion-resistant film, a solvent for forming the corrosion-resistant film is sprayed from an inkjet nozzle, and the solvent is attached to a portion where the projections of the concavo-convex pattern are to be formed on the surface. The method of processing the concavo-convex pattern on the mold surface. 2. The mold according to claim 1, wherein the etchant is ejected from an inkjet nozzle during corrosion removal with the etchant, and the etchant is attached to an exposed portion of the surface that is not covered with the corrosion-resistant film. Surface uneven pattern processing method. 3. The method for processing a concavo-convex pattern on a mold surface according to claim 2, wherein the etching solution is sprayed from a nozzle formed of a material having corrosion resistance to the etching solution when the corrosion is removed by the etching solution. By displacing both the nozzle and the mold and changing the relative position of the mold with respect to the nozzle, the distance from the nozzle to the surface of the mold is maintained substantially constant, and in this state the The uneven | corrugated pattern processing method of the metal mold | die surface as described in any one of Claims 1-3 which performs injection from a nozzle.

Images