JP6435168B2 - Resin molded product, injection mold and method of manufacturing injection mold - Google Patents

Description

  The present invention belongs to the technical field of, for example, a resin molded product having a code composed of a matrix type two-dimensional code, an injection mold for molding the resin molded product, and a method for manufacturing the injection mold.

  2. Description of the Related Art Conventionally, there is a case where a seal on which a code composed of a matrix type two-dimensional code or the like for identifying a part is affixed to a resin molded product such as an automobile part. However, in the case of the method of sticking the seal, an operation of sticking the seal to each component is required after the molding of the component, resulting in an increase in work man-hours.

  Therefore, for example, as disclosed in Patent Document 1, a method of obtaining a resin molded product having a code by forming a code on the resin molded product at the same time by a mold when molding the resin molded product is known. ing. In Patent Document 1, two types of regions having different smoothness are formed in a resin molded product, so that the reader can distinguish between the two types of regions.

Japanese Patent No. 3707800

  By the way, in Patent Document 1, two types of regions having different smoothness formed on a resin molded product can be distinguished by a code reading device, whereby a region where a code is formed is distinguished from other regions. It is thought that can be made clear. However, even if the region where the code is formed can be clearly distinguished as in Patent Document 1, in the end, exactly what pattern the code formed in the region is, And it must be easy to recognize.

  This invention is made | formed in view of this point, The place made into the objective is to enable it to recognize correctly and easily the code | symbol simultaneously formed at the time of shaping | molding of a resin molded product.

The first invention is
In the resin molded product (1) having the code forming surface (11) on which the code (14) read by the reading device is formed,
The code (14) is a projection (12) protruding from the code formation surface (11) and a plane portion (13) composed of a surface other than the projections (12, 12) on the code formation surface (11). And consists of
The code forming surface (11) has a frame-shaped region (11a) surrounding the convex portion (12) and the planar portion (13), and the frame-shaped region (11a) and the planar portion (13). Is a mirror surface,
The width of the frame-type region (11a) is set to be equal to or greater than the width of the convex portion (12),
The outer surface (12a, 12b) of the convex portion (12) is matte-treated.

  According to this configuration, the flat surface portion constituting the code is a mirror surface, and the convex portion is in a dull state. Therefore, when the reading device reads, the difference between the flat surface portion and the convex portion is clearly determined by the reading device. It becomes easier to distinguish, and the code can be recognized accurately and easily.

The second invention, reference numeral (14) injection mold for molding a resin molded article (1) having a code forming surface is formed (11) to be read by the read-device (20),
The injection mold (20) includes an upper mold (21) and a lower mold (22) that open and close, a convex portion (12) that protrudes from the code forming surface (11), and a code forming surface (11). the convex portion (12) flat portion other than the (13) and de-configured code (14) has a code mold (23) for molding the above resin molded article (1),
The code molding die (23) is separated from the lower die (22) and supported by the lower die (22), and the opening and closing directions of the upper die (21) and the lower die (22) It consists of a slide type that slides in the intersecting direction,
A concave molding surface (24) for molding the convex portion (12) and a flat surface portion (13) for molding the convex portion (12) on the surface facing the lower die (22) of the code molding die (23). A flat molding surface (25) is formed,
The surface facing the lower mold (22) in the code mold (23) has a frame mold region surrounding the concave mold surface (24) and the flat mold surface (25), and the frame mold region And the flat molding surface (25) is a mirror surface,
The width of the frame region is set to be equal to or greater than the width of the convex portion (12),
The concave molding surface (24) is characterized by being matted.

  According to this structure, the code | symbol comprised by the plane part and the convex part is simultaneously formed in this resin molded product at the time of shaping | molding of a resin molded product. And since the flat part of the code becomes a mirror surface and the convex part has a dull state, the difference between the flat part and the convex part can be clearly distinguished by the reading apparatus when reading with the reading apparatus, and the code is easy Will be recognized.

In addition , when the surface on which the code is formed in the resin molded product is a surface extending in a direction intersecting with the opening / closing direction of the injection mold, by sliding the code molding die before demolding, The code is not damaged and a clear code can be obtained .

  According to the first invention, since the flat surface portion constituting the code is mirror-finished and the outer surface of the convex portion is matted, the code formed at the time of molding the resin molded product is accurately and easily read by the reading device. Can be recognized.

In addition , the code forming surface has a frame-type region surrounding the convex portion and the flat portion, the frame-type region is mirror-finished, and the width of the frame-type region is set to be equal to or greater than the width of the convex portion. It can be recognized more easily.

According to the second invention, a resin molded product that can be easily recognized by the reading device as in the first invention can be obtained.

In addition , since the code mold is configured by a slide mold that slides in a direction intersecting with the opening / closing direction of the injection mold, the surface on which the code is formed in the resin molded product intersects with the opening / closing direction of the injection mold. A clear code can be obtained when the surface extends in a straight line .

It is a side view of the resin molded product which concerns on embodiment. It is the elements on larger scale of the II-II line in FIG. It is sectional drawing of the injection mold which shape | molded the resin molded product. It is sectional drawing which expands and shows the code | molding mold vicinity of an injection mold. It is an expanded sectional view which shows the manufacturing method of a code shaping | molding die, (a) is a masking process, (b) is an etching process, (c) is a masking removal process, (d) is a blasting process, (e) is a mirror surface finishing process. Respectively.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a side view of a resin molded product 1 according to an embodiment of the present invention. The resin molded product 1 can include, for example, automobile parts, parts for electric devices, various containers, and the like, and includes a code 14 made of a matrix type two-dimensional code or a bar code read by a reading device (not shown). Yes. Reference numeral 14 indicates, for example, the product number or material of the resin molded product 1, and is formed simultaneously with the molding of the resin molded product 1 in this embodiment. As the reading device, an optical reading device that has been generally used can be used.

  The resin molded product 1 is injection-molded using an injection mold 20 as shown in FIG. 3 and has a hollow shape. As shown in FIG. 1, the side plate portion 10 of the resin molded product 1 extends in the vertical direction and has a code forming surface 11 on which a code 14 is formed. In this embodiment, the area surrounded by the substantially square quadrilateral A in FIG. The part where the code forming surface 11 is provided is not limited to the side plate portion 10 of the resin molded product 1, and can be provided at any part of the resin molded product 1, for example, provided on the bottom or inner surface of the resin molded product 1. Also good.

Reference numeral 14 includes a plurality of convex portions 12 protruding from the code forming surface 11 and a flat surface portion 13. In addition, the convex part 12 may be one. In FIG. 1, the convex portion 12 is shown in black, and the flat portion 13 is shown in white.
In the case of a matrix type two-dimensional code, the convex portion 12 includes a small square shape and a rectangular shape as shown in FIG. 1, and various patterns are configured depending on the arrangement of the convex portions 12. A surface between the convex portion 12 and the convex portion 12 on the code forming surface 11 becomes a flat portion 13.

  As shown in FIG. 2, the convex part 12 has a rectangular cross section. A front end surface (outer surface) 12 a in the protruding direction of the convex portion 12 extends in the same direction as the side plate portion 10. An outer peripheral surface (outer surface) 12 b of the convex portion 12 extends in a direction orthogonal to the side plate portion 10. The front end surface 12a and the outer peripheral surface 12b of the convex portion 12 are matted. That is, the tip surface 12a and the outer peripheral surface 12b of the convex part 12 are shape | molded so that it may become the range of arithmetic mean roughness Ra1.10. The tip surface 12a and the outer peripheral surface 12b of the convex portion 12 are preferably molded so as to have Ra 1.16.

  The flat surface portion 13 has a mirror finish. That is, the flat portion 13 is formed so that Ra is 0.1 or less. Ra 0.09 may be sufficient as the roughness of the plane part 13, for example, the range of Ra0.1-0.09 is preferable.

  Further, as shown in FIG. 2, the height of the convex portion 12, that is, the dimension H from the flat portion 13 to the tip surface 12 a of the convex portion 12 is set to 50 μm. The dimension H can be set in the range of 40 μm to 70 μm, for example. This dimension H is a dimension after molding of the resin molded product 1.

  As shown in FIG. 1, the code forming surface 11 has a frame region 11 a that surrounds the convex portion 12 and the flat portion 13. In this embodiment, the frame-type region 11a has a square frame shape, and the surface of the code forming surface 11 other than the convex portion 12 and the plane portion 13 is the frame-type region 11a. The frame-type region 11 a is a mirror surface like the flat portion 13. The width W1 of the frame region 11a is set to be equal to or larger than the width W2 of the convex portion 12. The width W2 is the width of the convex portion 12 positioned on the outer peripheral side of the code forming surface 11, and is the length of one side in the case of the square convex portion 12, and the length of the short side in the case of the rectangular convex portion 12. Become.

  Next, the structure of the injection mold 20 for molding the resin molded product having the reference numeral 14 will be described with reference to FIGS. As shown in FIG. 3, the injection mold 20 includes an upper mold 21, a lower mold 22, and a code mold 23. Although not shown, the upper die 21 is moved in a direction (vertical direction) in contact with and separated from the lower die 22 by a die driving device so as to open and close. That is, the opening / closing direction of the injection mold 20 is the vertical direction. The opening / closing direction of the injection molding die 20 may be a horizontal direction. In this case, the injection molding die 20 shown in FIG. 3 may be rotated 90 ° left or right.

  The molding surface 21a of the upper mold 21 is for molding the inner surface of the resin molded product 1 and protrudes downward. The molding surface 22a of the lower mold 22 is for molding the outer surface of the resin molded product 1, and is recessed so that the molding surface 21a of the upper mold 21 can be inserted. The lower mold 22 is formed with a through hole 22b that penetrates the lower mold 22 in the horizontal direction. The formation position of the through hole 22b is a part where the code 14 of the resin molded product 1 is formed. A code molding die 23 is inserted into the through hole 22b. The code molding die 23 is for molding the code 14 into the resin molded product 1 and is configured as a slide mold that slides in the direction in which the through hole 22b extends. Therefore, the code mold 23 slides in a direction intersecting with the opening / closing direction of the injection mold 20. The code forming die 23 is driven by a die driving device (not shown).

  On the surface facing the inside of the lower mold 22 in the code molding die 23, as shown in a partially enlarged view in FIG. 4, a concave molding surface 24 for molding the convex portion 12 of the reference numeral 14 and a plane portion of the reference numeral 14 A flat molding surface 25 for molding 13 is formed. The concave molding surface 24 includes a bottom surface 24a for molding the tip surface 12a of the convex portion 12 and an inner peripheral surface 24b for molding the outer peripheral surface 12b of the convex portion 12. The bottom surface 24a and the inner peripheral surface 24b are matted. The matte treatment of the bottom surface 24 a and the inner peripheral surface 24 b is for matting the convex portion 12 as described above. Therefore, the surface roughness of the bottom surface 24 a and the inner peripheral surface 24 b is the outer surface of the convex portion 12. Is the same. In this embodiment, the bottom surface 24a and the inner peripheral surface 24b of the concave molding surface 24 are matted by blasting (for example, sandblasting).

  The flat molding surface 25 becomes a mirror surface by performing mirror finishing. The mirror surface of the flat molding surface 25 is for making the flat surface portion 13 denoted by reference numeral 14 a mirror surface, and therefore the surface roughness of the flat molding surface 25 is the same as that of the flat surface portion 13. In this embodiment, the flat molding surface 25 is polished to be a mirror surface.

  Next, a method for manufacturing the injection mold 20 will be described. The upper mold 21 and the lower mold 22 are manufactured in the same manner as a general mold manufacturing method. The manufacturing method of the code mold 23 is as shown in FIG. 5. First, as shown in FIG. 5A, a masking member M is attached to the surface of the code mold 23 facing the lower mold 22 to perform a masking process. I do. This process is a masking process. The masking member M is a sheet-like member made of a material that is not dissolved by an etching solution used in an etching process described later. The masking member M is formed so as to mask the part C that becomes the flat molding surface 25 and expose the part B that becomes the concave molding surface 24.

  The etching process is performed in a state where the portion C to be the flat molding surface 25 is masked by the masking member M and the portion B (shown in FIG. 5A) to be the concave molding surface 24 is exposed. This process is an etching process. In this etching step, only a portion B that becomes the concave molding surface 24 is dissolved using a known etching solution. Thereby, as shown in FIG.5 (b), the concave molding surface 24 of the predetermined depth which can shape | mold the convex part 12 of the code | symbol 14 mentioned above is obtained.

  Next, the masking member M is removed from the code forming die 23 as shown in FIG. 5C, and then blasting is performed as shown in FIG. This process is a blast process. In this blasting process, the blasting process is performed so that the portion C to be the concave molding surface 24 and the flat molding surface 25 has a roughness in the range of Ra 1.10 to 1.17. Granules (sand) used in the blast treatment preferably have a particle size of about 0.5 mm, but are not limited to this, and as a granule that can achieve a roughness in the range of Ra 1.10 to 1.17. For example, sand, glass beads, iron particles, aluminum alloy particles, or the like can be used. In the blasting process, the entire surface roughness of the portion C that becomes the concave molding surface 24 and the flat molding surface 25 becomes rough. In this embodiment, the surface roughness is roughened by blasting, but the method of roughening the surface roughness is not limited to blasting, and for example, a method of polishing with an abrasive having a large particle size may be used. Further, the surface may be roughened by electric discharge machining or laser machining.

  Thereafter, as shown in FIG. 5 (e), the part C to be the flat molding surface 25 is mirror-finished by a mirror-finishing polishing apparatus (not shown). This process is a mirror finishing process. In the mirror finishing step, polishing is performed so that the roughness of the finished surface is in the range of Ra 0.1 to 0.09.

  By performing the above steps in order, a matted concave molding surface 24 and a mirror-like flat molding surface 25 are obtained. Outside the range where the concave molding surface 24 and the flat molding surface 25 are formed in the code molding die 23, it is mirror-finished in the same manner as the flat molding surface 25, and the frame region 11 a of the code forming surface 11 is molded. ing.

  Next, the case where the resin molded product 1 is shape | molded with the injection mold 20 comprised as mentioned above is demonstrated. First, the upper die 21 and the lower die 22 are closed, and a cavity (not shown) is formed between the upper die 21 and the lower die 22. At this time, the code mold 23 is moved forward so that the surface of the code mold 23 facing the lower mold 22 is flush with the inner surface of the lower mold 22.

  Then, a molten resin material is injected into a cavity between the upper mold 21 and the lower mold 22 from a cylinder of an injection molding machine (not shown). The molten resin material is molded by the molding surface 21 a of the upper mold 21 and the molding surface 22 a of the lower mold 22, and the code 14 is simultaneously molded by the concave molding surface 24 and the flat molding surface 25 of the code molding die 23. At this time, the frame region 11 a of the code forming surface 11 is also simultaneously formed by the code forming die 23. The color of the molten resin material is, for example, black, but is not limited thereto, and may be other than black.

  After the resin material is solidified, the code mold 23 is moved backward and the upper mold 21 is moved upward, and then the resin molded product 1 is removed. The timing for retracting the code molding die 23 and the timing for moving the upper die 21 upward may be the same, or either one may be accelerated.

  A reference numeral 14 is formed on the side plate portion 10 of the resin molded product 1 obtained as described above. The front end surface 12a and the outer peripheral surface 12b of the convex portion 12 constituting the reference numeral 14 are matted, and the flat surface portion 13 constituting the reference numeral 14 is a mirror surface. The difference from the section 13 is easily clearly distinguished by the reading device. Thereby, the code | symbol 14 can be recognized correctly and easily.

  Further, the code forming surface 11 has a frame-type region 11a surrounding the convex portion 12 and the flat portion 13, the frame-type region 11a is mirror-finished, and the width W1 of the frame-type region 11a is set to the width W2 of the convex portion 12. Since it set above, the code | symbol 14 can be recognized still more easily.

  In this embodiment, the code forming surface 11 of the resin molded product 1 is a surface extending in a direction intersecting with the opening / closing direction of the injection mold 20. Since the code forming die 23 is constituted by a slide die that slides in the direction in which the opening and closing direction of the die 20 intersects (direction perpendicular to the code forming surface 11), the code 14 is not damaged at the time of demolding, and the clear code 14 can be obtained.

  Further, when the code mold 23 of the injection mold 20 is manufactured, the code mold 23 can be easily obtained by performing masking, etching, blasting, and mirror finishing.

  When manufacturing the code mold 23 of the injection mold 20, instead of the masking and etching processes, an electric discharge process or a laser process is performed to form a concave mold surface 24 having a predetermined depth, and then a blast process or a mirror surface is performed. Finishing can also be performed.

  The above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the present invention can be used as a resin molded product such as an automobile part.

DESCRIPTION OF SYMBOLS 1 Resin molded product 11 Code | symbol formation surface 12 Convex part 12a Tip surface (outer surface)
12b Outer peripheral surface (outer surface)
13 Flat portion 14 Reference numeral 20 Injection mold 23 Reference mold 24 Recessed molding surface 25 Flat molding surface

Claims (2)

In the resin molded product (1) having the code forming surface (11) on which the code (14) read by the reading device is formed,
The code (14) includes a convex portion (12) protruding from the code forming surface (11) and a plane portion (13) including a surface other than the convex portion (12) in the code forming surface (11). Configured,
The code forming surface (11) has a frame-shaped region (11a) surrounding the convex portion (12) and the planar portion (13), and the frame-shaped region (11a) and the planar portion (13). Is a mirror surface,
The width of the frame-type region (11a) is set to be equal to or greater than the width of the convex portion (12),
The resin molded product (1), wherein the outer surfaces (12a, 12b) of the convex portion (12) are matted. In an injection mold (20) for molding a resin molded product (1) having a code forming surface (11) on which a code (14) read by a reading device is formed,
The injection mold (20) includes an upper mold (21) and a lower mold (22) that open and close, a convex portion (12) that protrudes from the code forming surface (11), and a code forming surface (11). the convex portion (12) flat portion other than the (13) and de-configured code (14) has a code mold (23) for molding the above resin molded article (1),
The code molding die (23) is separated from the lower die (22) and supported by the lower die (22), and the opening and closing directions of the upper die (21) and the lower die (22) It consists of a slide type that slides in the intersecting direction,
A concave molding surface (24) for molding the convex portion (12) and a flat surface portion (13) for molding the convex portion (12) on the surface facing the lower die (22) of the code molding die (23). A flat molding surface (25) is formed,
The surface facing the lower mold (22) in the code mold (23) has a frame mold region surrounding the concave mold surface (24) and the flat mold surface (25), and the frame mold region And the flat molding surface (25) is a mirror surface,
The width of the frame region is set to be equal to or greater than the width of the convex portion (12),
An injection mold (20), wherein the concave molding surface (24) is matted.

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