JP5183972B2 - Injection molding production equipment - Google Patents

Description

  The present invention is manufactured by secondary injection of the same resin material as the lens portion into the butted portion in a state where the main body portion and the lens portion made of different resin materials manufactured in the primary injection process are butted against each other. The present invention belongs to the technical field of an apparatus for manufacturing an injection molded body such as a casing.

In general, when manufacturing such an injection-molded body, for example, when this is a casing, a main body part in which a different light source is injected and a light source is incorporated in a primary injection process, and a translucent lens part, After that, the manufactured body part and lens part are butted against each other, and a resin material is secondarily injected into the butted part and integrated, thereby producing an injection molded body as a casing. There are some (for example, Patent Documents 1 and 2). Now, as molds for manufacturing these, one is a fixed mold, the other is a movable mold, and the lens part in the case of primary injection is left on the fixed mold side, and the main body part is left on the movable mold. After moving away from the mold, the movable mold is moved parallel to the mold surface with respect to the fixed mold, and then the mold is aligned so that the main body portion and the lens portion face each other, and then the secondary injection is performed. In such a case, the first and second injection devices for injecting the resin material for the lens portion and the main body portion are provided on the fixed mold side for reasons such as assembly of the entire device and stabilization of the injection device. It will be.
In this case, the resin material of the main body portion remaining on the movable mold side may be integrated by secondary injection, and in such a case, as the injection flow path of the main body side resin material, the flow path for primary injection and It is necessary to form a flow path for secondary injection.
JP 2002-36289 A JP 2002-113743 A

  By the way, when forming an injection flow path of such a resin material, it is not difficult to route the injection flow path in the case of manufacturing a single casing in one manufacturing process. When two housings are to be manufactured at the same time in the manufacturing process, these injection channels are difficult due to the relationship with the injection channel for manufacturing the lens part. However, it is necessary to homogenize the product by making the injection pressure for producing the two casings constant, but it is difficult to design the injection flow path for this purpose, and here is the problem to be solved by the present invention. There is.

The present invention has been created in view of the above-described circumstances and has been created for the purpose of solving these problems. The invention of claim 1 is directed to first and second molds that move relative to each other. The mold surface for forming the secondary injection space for manufacturing the injection molded body by abutting and integrating the first and second components with the mold surface for the first and second parts formed in the injection process The first and second injection devices for injection-molding the first and second parts are provided on the first mold side, and the secondary injection is performed by injection from the second injection device In the production apparatus for an injection molded body configured as described above, when the mold surfaces are formed in pairs so that two injection molded bodies can be manufactured at the same time, from the injection position of the first injection apparatus to the first part The first injection flow path of the first resin material reaching the mold surface is sandwiched between both mold surfaces for the first part Formed between the mold surfaces for both the first parts, and the injection position of the second injection device is positioned closer to the mold surface for the second component than the injection position of the first injection device. The second injection flow path of the second resin material from the injection position passes through the main flow path to the second part mold surface and the outer sides of the first injection flow path to the secondary injection space. An apparatus for manufacturing an injection-molded article characterized by being branched into a flow path.
In a second aspect of the present invention, the pair of mold surfaces are arranged in a line-symmetrical position with respect to the symmetry line, and the first and second injection flow paths are formed in an object shape with respect to the symmetry line. The apparatus for manufacturing an injection-molded article according to claim 1, wherein:
According to a third aspect of the invention, there is provided the injection molded body manufacturing apparatus according to the first or second aspect, wherein the first mold is a fixed mold and the second mold is a movable mold.
The invention according to claim 4 is characterized in that the portion of the sub-flow path reaching the secondary injection space is formed outside the first part mold surface with respect to the symmetry line. It is a manufacturing apparatus of an injection-molded body.

According to the first aspect of the present invention, in the case of manufacturing two injection-molded bodies in one manufacturing process, secondary injection is performed using a resin material for manufacturing the second part remaining on the second mold side. Thus, the injection flow path of the second resin material when integrating the first and second parts can be simplified without interfering with the first injection flow path.
According to the invention of claim 2, each mold surface and injection flow path for producing two injection-molded bodies in one production process are arranged in line symmetry, so that a primary injection process, In the secondary injection process, the injection pressure is prevented from being different between the two molded bodies, and the molded bodies can be homogenized.
The invention according to claim 3 stabilizes the injection device itself by providing the first and second injection devices on the side of the stationary fixed mold that does not move, and the injection flow path from these. It will be possible.
By making it the invention of Claim 4, the sub-flow path which comprises a 2nd injection flow path can be made outside without considering a 1st injection flow path, and is stabilized.

  Next, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a casing, and the casing (corresponding to the “injection molded body” of the present invention) 1 is a lens portion (made of a translucent resin material typified by polycarbonate) ( 2) and a non-translucent resin material represented by polymethylmethacrylate (which is made non-translucent by inserting a filler such as carbon). The main body part (corresponding to the “second part” of the present invention) 3 and the light source 4 represented by a light bulb or a light-emitting diode, the terminal material 4a, and the like are brought into contact with each other in a state where the main body part 3 is incorporated. A resin material for forming the main body portion 3 in the space formed in the abutting portion (hereinafter, the resin material 5 for the main body portion 3 is referred to as a “second resin material”, and the resin material for the lens portion 2 is referred to as “first resin material”. The resin material "corresponds to the present invention.) And is integrated and manufactured. Hereinafter, parts such as a light source are not particularly necessary for explaining the present invention, and thus the description thereof is omitted. In addition, it is a well-known technique to form a film on the inner surface of the main body 3 in the process from the primary injection to the secondary injection to make a reflection surface. This is a primary and secondary injection process. The present invention can be implemented during this period, and the reference to this is also omitted.

  6 is a fixed mold (corresponding to the “first mold” of the present invention), 7 is a movable mold (corresponding to the “second mold” of the present invention), and the movable mold 7 is It is set so that the movement of moving away from and contacting the fixed mold 6 and the movement parallel to the mold surface can be performed by a driving means (not shown). And in this thing, the concave mold surface 6a for forming the outer surface (housing body surface) of the lens part 2 in the fixed mold 6, and the convex mold surface 6b for forming the inner surface of the main body part 3 A convex mold surface 6c for forming the secondary injection space S is formed. On the other hand, the movable mold 7 includes a convex mold surface 7a for forming the inner surface of the lens unit 2, a concave mold surface 7b for forming the outer surface (back surface of the casing) of the main body unit 3, and two A convex mold surface 7c for forming the next injection space S is formed.

  In this case, the fixed and movable molds 6 and 7 are aligned with the mold surfaces 6a and 7a, between the mold surfaces 6b and 7b, and between the mold surfaces 6c and 7c, and between the mold surfaces 6a and 7a. The second resin material and the first resin material are injected into the spaces formed between the mold surfaces 6b and 7b, respectively, to form the main body 3 and the lens portion 2 (see FIG. 2A). Thereafter, the movable mold 7 is moved so that the main body 2 remaining in the movable mold 7 is in contact with the lens section 2 remaining in the fixed mold 6, and the movable mold 7 is moved into the space S formed in the abutting section. One resin material is injected and integrated (see FIG. 2 (B)), whereby the housing 1 is manufactured by a series of mold movements and injection operations, but details thereof are omitted since they are already known. To do.

  Now, in the fixed and movable molds 6 and 7, a pair of corresponding mold surfaces 6a to 6c and 7a to 7c are symmetrical with respect to the symmetry line L in order to manufacture the two casings 1 at a time. They are formed in parallel. The necessary mold matching is executed in accordance with a series of mold movements. In this case, the first and second injection devices 8 and 9 for injecting the first and second resin materials are provided in the manifold 10 where the fixed mold 7 is provided, and the injection positions 8a and 9a are set. However, with regard to the arrangement of these injection positions 8a and 9a, the injection position 8a of the first injection device 8 is on the lens mold surface 7a side, and the injection position 9a of the second injection device 9 is the mold surface for the main body. 7b side, all are arranged at a position corresponding to the symmetry line L. Incidentally, these injection devices 8 and 9 are arranged close to each other, and thereby, consideration is given to enhancing energy efficiency for heating and melting the resin material.

  The first injection flow path 11 from the first injection device 8 formed in the manifold 10 reaches the position corresponding to the lens part side mold surface 6a along the symmetry line L in a state along the mold surface of the fixed mold. 11b is bent in a state perpendicular to the symmetry line L to reach the position corresponding to both lens part side mold surfaces 6a, and in this embodiment, the lens part side mold surface at the center position of the outer surface of the lens part 2 It is formed so as to be bent 11c so as to face 6a and to reach both lens part side mold surfaces 6a. That is, it is formed in a region sandwiched between both lens part side mold surfaces 6a.

  On the other hand, the second injection flow path 12 from the second injection device 9 formed in the manifold 10 is supplied to the main flow path 12a and the secondary injection space S for supplying to the lens part side gold surface 6b. The main flow path 12a is formed along the symmetry line L toward the main body side mold surface 6b. Each body part is bent at both sides in a state of being orthogonal to reach a position corresponding to the pair of body part side mold surfaces 6b, 12a-2, and in the present embodiment, at a position farthest from the lens part mold surface 6a of the body part 3. It is formed so as to be bent 12a-3 so as to face the mold surface 6b and to reach both main body side mold surfaces 6b.

  Further, the sub-flow channel 12b is formed in a state orthogonal to the symmetry line L at the front position reaching the first injection position 8a when the channel 12b-1 formed along the symmetry line L in the direction of the lens part side mold surface 6a. 12b-2 which bends on both sides to reach an outer position beyond the position corresponding to the pair of lens part side mold surfaces 6a, and is parallel to the symmetry line L while maintaining the outer position. The lens portion side mold surface 6a reaches a position corresponding to 12b-3, which is further bent toward both sides in a state along the symmetry line L, and is farthest from the body portion mold surface 6b in this embodiment. Bending 12b-5 to reach the lens portion side mold surface 6a so as to reach the secondary injection space S at the position closest to the position, reaches the position corresponding to the space S, and then bends 12b toward the space S from here. -6 is formed.

  In the embodiment of the present invention formed as described, two casings 1 are manufactured in a single manufacturing process in which primary and secondary injections are performed. In this case, fixed metal The injection flow path 11 from the first injection device 8 formed in the manifold 10 where the mold 7 is provided is between the lens surfaces 6a and 6a so as to be sandwiched between the lens surfaces 6a and 6a. The injection position 9a of the second injection device 9 is positioned closer to the main body mold surface 6b side than the injection position 8a of the first injection device 8, and the injection position 9a of the second injection device 9 is further formed. The second injection flow path 12 of the second resin material from the main flow path 12a reaching the main body part mold surface 7b and the secondary injection space S so as to pass through both outer sides of the first injection flow path 11 respectively. Branched to the secondary flow path 12b Therefore, the first and second injection flow passages 11 and 12 can be made independent flow passages in the manifold 10 without interfering with each other, and as a result, either one of them may interfere with each other. For example, the manifold 10 can be made thin so that the apparatus can be made compact.

  In addition, the lens part mold surfaces 6a and 6a, the body part mold surfaces 6b and 6b, and the secondary injection space forming mold surfaces 6c and 6c, which are formed in pairs, are based on the symmetry line L. And the first and second injection flow paths 11 and 12 are formed in a symmetrical manner with respect to the symmetry line L. As a result, the first and second injection flow paths 11 and 12 pass through the injection flow paths 11 and 12, respectively. The injection pressures of the first and second resin materials supplied to the corresponding mold surfaces are equal to the corresponding pair of mold surfaces. As a result, the injection pressure varies and the product quality varies. Generation | occurrence | production will be prevented and the high quality housing 1 can be manufactured.

  In addition, since the first and second injection devices 8 and 9 are incorporated in the manifold 10 on the fixed mold 7 side that does not move, the injection device 8 is provided as in the movable mold 8 that moves. , 9 itself will not move and lack stability.

  Further, the secondary flow path 12b provided for the secondary injection is formed so that the portion reaching the secondary injection space S is positioned outside the lens surface 6a, 6a with respect to the symmetry line L. The sub-channel 12b not only has no interference with the first injection channel 11, but is further away from the first injection channel 11, so that the melting temperature (injection temperature) of the first and second resin materials is increased. ) Are different from each other in height, it becomes difficult to be affected by the difference in temperature and stable injection can be performed.

  Of course, the present invention is not limited to the above-described embodiment, and the lens portion and the main body portion are reversely related, and the resin material on the lens portion side is secondarily injected. Of course, the injection molded body manufactured by primary injection and secondary injection is not limited to a casing.

It is sectional drawing of a housing. (A) (B) is a schematic sectional process drawing of a primary injection process and a secondary injection process. It is a plane circuit diagram of an injection channel. It is a schematic sectional drawing which shows the injection flow path of the resin material with which it fills at the time of primary injection. It is a schematic sectional drawing which shows the injection flow path of the resin material with which it fills at the time of secondary injection.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Lens part 3 Main body part 6 Fixed mold 6a-6c Mold surface 7 Movable mold 7a-7c Mold surface 8 1st injection apparatus 8a Injection position 9 2nd injection apparatus 9a Injection position 10 Manifold 11 1st injection flow Road 12 Second injection flow path 12a Main injection flow path 12b Sub injection flow path

Claims (4)

The first and second molds that are moved relative to each other, the first and second part mold surfaces formed in the primary injection process, and the first and second parts are butted together to form an injection molded body. And forming a mold surface that forms a space for secondary injection for manufacturing the first and second injection devices for injection molding the first and second parts on the first mold side, In the manufacturing apparatus of an injection molded body configured to execute the secondary injection by injection from the second injection device,
In forming each pair of the mold surfaces so that two injection molded bodies can be manufactured simultaneously,
The first injection flow path of the first resin material from the injection position of the first injection device to the mold surface for the first part is between the mold surfaces for the first parts so as to be sandwiched between the mold surfaces for the first parts. Forming
Position the injection position of the second injection device closer to the mold surface for the second part than the injection position of the first injection device,
The second injection path of the second resin material from the injection position of the second injection device passes through the main flow path leading to the mold surface for the second part and the outer sides of the first injection flow path, and the secondary injection. An apparatus for manufacturing an injection-molded body, wherein the apparatus is branched into sub-flow paths that respectively reach the working space.   Each of the pair of mold surfaces is arranged at a line-symmetrical position with respect to the symmetry line, and the first and second injection flow paths are formed in a target shape with respect to the symmetry line. The manufacturing apparatus of the injection molded body of Claim 1.   The apparatus for producing an injection-molded article according to claim 1 or 2, wherein the first mold is a fixed mold and the second mold is a movable mold.   4. The injection molded body manufacturing apparatus according to claim 2, wherein a portion of the sub-flow path reaching the secondary injection space is formed outside the first part mold surface with respect to the symmetry line.

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