JP2020049894A - Manufacturing method of two-color molding - Google Patents

Abstract

To suppress the occurrence of burrs at molding of a secondary resin part.SOLUTION: In a primary molding process, a primary resin part 11 is molded by using a primary resin material 17. In a subsequent secondary molding process, a common metal mold 35 in a state where the primary resin part 11 is held is moved from a position facing a primary metal mold 34 to a position facing a secondary metal mold 42. By mold closing of a secondary molding metal mold 41, a secondary cavity 43 is formed among the common metal mold 35, the primary resin part 11 and the secondary metal mold 42. By charging a secondary resin material 25 in the secondary cavity 43 via a secondary gate 44, a secondary resin part being in contact with the primary resin part 11 is molded. The secondary metal mold 42 has a protrusion part extending in the mold closing direction. When mold closing of the secondary molding metal mold 41, the common metal mold 35 approaches the secondary metal mold 42 while the protrusion part bites a portion being the periphery of the secondary cavity 43 out of the primary resin part 11.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a method for manufacturing a two-color molded product obtained by integrally molding a primary resin portion made of a primary resin material and a secondary resin portion made of a secondary resin material.

  A two-color molded product obtained by integrally molding a primary resin portion and a secondary resin portion made of different types of resin materials is generally a fixed mold, as described in Patent Document 1, for example. Molding is performed using one type of two-color molding die having a movable die and a moving core.

  That is, by closing the two-color molding die, a primary cavity is formed between the fixed die, the movable die, and the movable core. The primary resin portion is molded by filling the primary cavity with the primary resin material.

  Next, by moving (moving back) the movable core, a secondary cavity is formed between the fixed mold, the movable mold, the movable core, and the primary resin portion. In other words, the space vacated by the movement (retreat) of the moving core becomes a secondary cavity. By filling the secondary resin material into the secondary cavity, the secondary resin part in contact with the primary resin part is formed. In this way, a two-color molded product including the primary resin part and the secondary resin part is obtained.

  The above manufacturing method cannot be applied to a two-color molded product in which the primary resin portion has an undercut shape in the moving direction of the moving core. This is because the portion having the undercut shape hinders the movement of the moving core.

Therefore, for example, as described in Patent Literature 2, a manufacturing method is employed in which the two-color molded article is formed without using a moving core.
In this manufacturing method, a primary mold having a common mold and a primary mold, and a secondary mold having the common mold and the secondary mold are used. Then, the two-color molded product is molded by sequentially performing the primary molding process and the secondary molding process.

  In the primary molding step, a primary cavity is formed between the common mold and the primary mold by closing the primary mold. By filling the primary cavity with the primary resin material, the primary resin portion is formed.

  In the secondary molding step, the primary molding die and the secondary molding die are both opened, and the common mold holding the primary resin portion is moved from the position facing the primary mold to the position facing the secondary mold. Moved to By closing the secondary mold, a secondary cavity is formed between the common mold, the primary resin part, and the secondary mold. By filling the secondary resin material into the secondary cavity, the secondary resin part in contact with the primary resin part is formed.

Patent No. 3033410 JP-A-2005-49595

  However, in the latter method of manufacturing a two-color molded product, in the secondary molding step, the primary molding die and the secondary molding die are opened, and the common mold holding the primary resin portion is the primary die. The primary resin part is removed from the primary mold by being separated from the primary mold. After the common mold held in the primary resin part is moved from the position facing the primary mold to the position facing the secondary mold, when closing the mold of the secondary molding mold, the primary resin part is held. When the common mold approaches the secondary mold, the primary resin portion is arranged (set) in the secondary mold, and a secondary cavity is formed.

  During the period from when the primary resin part is removed from the primary mold to when it is arranged in the secondary mold, the primary resin part may contract or deform. In addition, when the primary resin part is arranged in the secondary mold, there is a possibility that a positional shift may occur. Then, when the primary resin portion contracted or deformed in this way is placed in the secondary mold or a position shift occurs, between the secondary mold and the primary resin portion, the secondary cavity A gap is likely to occur at a location adjacent to the outside. If the secondary cavity is filled with the secondary resin material in a state where the gap is generated, a part of the secondary resin material enters the gap. When the secondary resin material that has entered the gap is cured, burrs may be generated.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method of manufacturing a two-color molded product that can suppress occurrence of burrs during molding of a secondary resin portion. It is in.

  A method of manufacturing a two-color molded product that solves the above-described problem, using a primary mold having a common mold and a primary mold, and a secondary molding mold having the common mold and a secondary mold, A method for manufacturing a two-color molded product obtained by integrally molding a primary resin part made of a primary resin material and a secondary resin part made of a secondary resin material, wherein the primary molding die is closed. A primary molding step of filling the primary resin material into a primary cavity formed between the primary mold and the common mold to mold the primary resin portion; and a primary molding die and the secondary molding die. The mold is opened together, and after moving the common mold holding the primary resin portion from a position facing the primary mold to a position facing the secondary mold, the primary molding is performed. By closing the mold and the secondary molding mold, the common mold, A secondary cavity is formed between the primary resin part and the secondary mold, and the secondary resin material is filled in the secondary cavity from a secondary gate, and the secondary cavity is in contact with the primary resin part. And a secondary molding step of molding a secondary resin part. In the secondary molding step, a mold having a ridge extending in a mold closing direction is used as the secondary mold, and a mold of the secondary mold is used. At the time of closing, the common mold is made to approach the secondary mold while making the ridge portion bite into a portion of the primary resin portion around the secondary cavity.

  According to the above manufacturing method, in the primary molding step, when closing the primary molding die, the primary resin material is filled in the primary cavity formed between the primary die and the common die to form the primary resin part. Is done.

  In the secondary molding step, the primary molding die and the secondary molding die are both opened, so that the common mold holding the primary resin part is separated from the primary mold, and the primary resin part is separated from the primary mold. Removed from the mold.

  The common mold holding the primary resin portion is moved from a position facing the primary mold to a position facing the secondary mold. Thereafter, the primary molding die and the secondary molding die are closed, so that the primary resin portion is arranged (set) on the secondary die. Also, a secondary cavity is formed between the common mold, the primary resin part, and the secondary mold. The secondary resin material is filled into the secondary cavity from the secondary gate, and the secondary resin portion in contact with the primary resin portion is formed.

  Here, during the period from when the primary resin portion is removed from the primary mold to when it is disposed in the secondary mold, the primary resin portion may contract or deform. When the primary resin part is arranged in the secondary mold, there is a possibility that a positional shift may occur. When the primary resin part contracted or deformed as described above is placed in the secondary mold or a positional shift occurs, the primary resin part is located between the secondary mold and the primary resin part and outside the secondary cavity. Gaps are likely to be generated at locations adjacent to. In this state, when the secondary resin material is filled into the secondary cavity from the secondary gate, a part of the secondary resin material tries to enter the gap.

  However, in the secondary molding step, a secondary mold having a ridge extending in the mold closing direction is used. Then, when closing the mold of the secondary molding die, the common mold is used while the protrusion is being cut into a portion of the primary resin portion around the secondary cavity (while the primary resin portion is being deformed). Closed to the mold. The portion where the ridge portion has cut into the primary resin portion has no gap, and prevents the secondary resin material from flowing out (leaking) out of the secondary cavity. Therefore, the phenomenon that the secondary resin material enters the gap and is hardened to generate burrs is less likely to occur.

In the method for manufacturing a two-color molded product, in the primary molding step, it is preferable that the primary resin portion is molded using the primary resin material that is harder than the secondary resin material.
According to the above manufacturing method, in the primary molding step, the primary cavity between the primary mold and the common mold is filled with the primary resin material harder than the secondary resin material, and A hard primary resin part is molded.

  In the secondary molding step, the secondary mold formed between the common mold, the primary resin part and the secondary mold is filled with a secondary resin material softer than the primary resin material, and the primary resin part is filled in the secondary cavity. A secondary resin part that is in contact with and softer than the primary resin part is formed.

  In the secondary molding step, when the secondary molding die is closed, the hard ridges in the secondary die bite into the primary resin portion which is harder than the secondary resin portion (the primary resin portion). The common mold is brought closer to the secondary mold (while deforming the part). The portion where the ridge portion has cut into the primary resin portion has no gap, and prevents the secondary resin material from flowing out (leaking) out of the secondary cavity. The hard primary resin portion is not easily deformed even when the high pressure of the secondary resin material acts. The gap between the primary resin portion and the ridge portion is maintained without any gap, so that the secondary resin material does not easily flow out (leak).

  In the method for manufacturing a two-color molded article, in the secondary molding step, the secondary mold may be one in which the ridge portions are provided at locations facing each other across the secondary gate. Is preferred.

  Here, in the secondary molding step, when the secondary resin material in the molten state is filled in the secondary cavity, the pressure of the secondary resin material in the secondary cavity is such that the secondary resin material flows into the secondary cavity. It is highest at the secondary gate at the entrance.

  In this regard, according to the above-described manufacturing method, when the secondary molding die is closed in the secondary molding step, the ridges provided at opposing positions with the secondary gate interposed therebetween are primarily bonded. The common mold is made to approach the secondary mold while biting into the resin part. The portion where both ridges have cut into the primary resin portion has no gap.

  Therefore, when the secondary resin material in a molten state under high pressure is filled in the secondary cavity, the phenomenon that the secondary resin material flows out (leaks) to the outside of the secondary cavity is prevented by the two ridges. Therefore, the phenomenon in which the secondary resin material enters the gap and is hardened to generate burrs is more effectively suppressed.

In the method for manufacturing a two-color molded product, in the secondary molding step, it is preferable that the ridge portion is cut into the primary resin portion by a depth of 0.03 mm to 0.4 mm.
According to the above manufacturing method, in the secondary molding step, when the secondary molding die is closed, the ridge portion is made to bite into the primary resin portion by a depth of 0.03 mm to 0.4 mm. While the common mold is brought closer to the secondary mold.

  The digging depth of the ridge portion with respect to the primary resin portion is set to 0.03 mm or more, so that the primary resin portion is removed from the primary mold until the primary resin portion is disposed in the secondary mold. Even if the part shrinks and deforms or the primary resin part is displaced when it is placed on the secondary mold, the place where the ridge bites into the primary resin part has no gap. . This has the effect of preventing the secondary resin material from flowing out (leaking) out of the secondary cavity.

  In addition, by setting the bite depth to 0.4 mm or less, in addition to the above-mentioned effects, the effect of smoothly closing the mold of the secondary molding die and the influence on the shape of the primary resin portion are obtained. The effect of making it difficult to exert is obtained.

  The method for producing a two-color molded article is preferably applied when producing a duct quarter vent of an automobile as a two-color molded article.

  According to the method for manufacturing a two-color molded product, it is possible to suppress the occurrence of burrs during molding of the secondary resin portion.

Sectional drawing of the two-color molded article in one Embodiment. FIG. 2 is a sectional view taken along line 2-2 of FIG. 1. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the manufacturing apparatus and manufacturing method of the two-color molded article in one Embodiment, Comprising: Schematic sectional drawing which shows the state in which the primary molding die and the secondary molding die were both opened. FIG. 4 is a sectional view taken along line 4-4 of FIG. 3. FIG. 5 is a sectional view taken along line 5-5 of FIG. 3. FIG. 1 is a schematic cross-sectional view showing a state where both a primary molding die and a secondary molding die in one embodiment are closed. FIG. 7 is a schematic cross-sectional view showing a state where a primary resin material is filled in a primary cavity in FIG. 6 to form a primary resin portion. FIG. 2 is a schematic cross-sectional view showing a state in which a primary molding die and a secondary molding die in a state where a primary resin portion is held by a common die in one embodiment and a secondary molding die are opened. FIG. 4 is a schematic cross-sectional view showing a state in which a common mold holding a primary resin part according to one embodiment has been rotationally moved to a position facing a secondary mold of a secondary molding mold. FIG. 2 is a schematic cross-sectional view showing a state in which the primary molding die and the secondary molding die holding the primary resin portion by the common die are both closed in one embodiment. FIG. 11 is a sectional view taken along line 11-11 of FIG. 10. (A) is a sectional view taken along line 12a-12a in FIG. 13, and (b) is a partial sectional view showing a part of FIG. 12 (a) in an enlarged manner. FIG. 4 is a schematic cross-sectional view showing a state in which a primary resin material is filled in a primary cavity to form a primary resin portion, and a secondary resin material is filled in a secondary cavity in the embodiment. FIG. 1 is a schematic cross-sectional view showing a state where both a primary molding die and a secondary molding die in one embodiment are opened.

Hereinafter, an embodiment of a method of manufacturing a two-color molded product will be described with reference to the drawings.
<About the two-color molded product 10>
First, a two-color molded product manufactured by the manufacturing method of the present embodiment will be described.

  As the two-color molded product, for example, a duct quarter vent for ventilating the interior of the vehicle interior while suppressing intrusion of dust and the like from the outside is suitable.In the present embodiment, the duct quarter vent is formed of two colors. It is a molded product.

  FIG. 1 shows a schematic configuration of the two-color molded product (duct quarter vent) 10. FIG. 2 shows a cross-sectional structure taken along line 2-2 in FIG. As shown in FIGS. 1 and 2, the two-color molded product 10 is configured by integrally molding a primary resin part 11 and a secondary resin part 21.

  The primary resin portion 11 is entirely formed of a primary resin material 17 and constitutes a skeleton portion of the two-color molded product 10. As the primary resin material 17, a hard resin material such as polypropylene (PP) is used. In addition, polypropylene with filler (PPF) may be used as the primary resin material 17 to increase the rigidity of the primary resin portion 11.

The primary resin portion 11 includes a tubular portion 12 and a plurality of ribs 15 and a flange portion 16 formed integrally with the tubular portion 12.
The tubular portion 12 extends along a drive shaft 31 of the manufacturing apparatus 30 described later, and has a tubular shape such as a square tubular shape with both ends opened. At a plurality of locations in the circumferential direction of the cylindrical portion 12, concave portions 13 that open on the outer peripheral surface of the cylindrical portion 12 are formed.

  The plurality of ribs 15 are arranged in a direction perpendicular to the paper surface in a state of being separated from each other in a parallel manner at one open portion (upper portion in FIG. 1) of the tubular portion 12. In FIG. 1, only one rib 15 is shown. Each rib 15 extends in the left-right direction in FIG. 1 and is connected to the tubular portion 12 at both ends.

The flange portion 16 is formed over the entire circumference of the tubular portion 12 so as to protrude outward from the outer peripheral surface of the tubular portion 12, and has an annular shape such as a square annular shape.
On the other hand, the secondary resin portion 21 is entirely formed of a type different from the primary resin material 17, in this embodiment, a secondary resin material 25 that is softer than the primary resin material 17. As the secondary resin material 25, for example, TPO (olefin-based thermoplastic elastomer) is used.

  The secondary resin portion 21 includes a flange portion 22, an elastic protrusion 23 and a vertical wall portion 24 formed integrally with the flange portion 22. The flange portion 22, like the flange portion 16 of the primary resin portion 11, is formed over the entire circumference of the cylindrical portion 12 so as to protrude outward from the outer peripheral surface of the cylindrical portion 12. The flange portion 22 has an annular shape such as a square annular shape, and is overlapped with the flange portion 16 of the primary resin portion 11 in a direction along the drive shaft 31.

  The elastic protruding portion 23 is formed over the entire circumference of the flange portion 22 so as to protrude obliquely outward from the outer peripheral surface of the flange portion 22, and has an annular shape such as a square annular shape. The elastic protrusion 23 is formed such that the thickness decreases as the distance from the flange 22 increases.

  The vertical wall portions 24 are provided at a plurality of locations in the circumferential direction of the tubular portion 12 and enter the corresponding recesses 13. One (upper in FIG. 1) end of each vertical wall portion 24 is connected to the flange portion 22.

  Push marks 14 extending in the direction along the drive shaft 31 remain at two places in the cylindrical portion 12 that sandwich each vertical wall portion 24 from both sides in the circumferential direction of the cylindrical portion 12. These indentation marks 14 are formed by the protrusions 45 biting into the primary resin portion 11 when the secondary molding die 41 is clamped in molding the secondary resin portion 21. Details will be described later.

<About the manufacturing apparatus 30>
Next, a manufacturing apparatus 30 used for manufacturing the two-color molded article 10 will be described with reference to FIG.

  The manufacturing apparatus 30 is for molding two two-color molded articles 10 having the same shape at different timings. In the manufacturing apparatus 30, a molding cycle of the preceding two-color molded article 10 is started, and a molding cycle of the subsequent two-color molded article 10 is started later.

  The manufacturing apparatus 30 includes a drive shaft 31 rotatably and reciprocally movable in an axial direction (vertical direction in FIG. 3), and a mounting plate fixed to one end (lower side in FIG. 3) of the drive shaft 31. 32, a primary molding die 33 for molding the primary resin portion 11, and a secondary molding die 41 for molding the secondary resin portion 21.

  The primary molding die 33 includes a primary die 34 (see FIG. 4) that forms a fixed die, and two common dies 35 and 36 that form a movable die. Further, the secondary molding die 41 includes a secondary die 42 (see FIG. 5) that constitutes a fixed die, and the two common dies 35 and 36 described above.

The primary mold 34 and the secondary mold 42 are formed in shapes different from each other, and are immovably arranged in a state where they are arranged in the radial direction of the drive shaft 31.
The two common molds 35 and 36 are formed in the same shape. Both common molds 35 and 36 constitute a part of the primary molding mold 33 and also constitute a part of the secondary molding mold 41.

  The two common molds 35 and 36 are fixed to the mounting plate 32 in a state of being arranged in the radial direction of the drive shaft 31. Then, as shown in FIG. 3, one common mold 35 can be opposed to the primary mold 34 and the other common mold 36 can be opposed to the secondary mold 42. Further, as shown in FIG. 9, by rotating the drive shaft 31 together with the mounting plate 32, the other common mold 36 is opposed to the primary mold 34, and the one common mold 35 is It is possible to face the mold 42.

  Further, by moving the drive shaft 31 together with the mounting plate 32 and the two common molds 35 and 36 toward the side closer to the primary mold 34 and the secondary mold 42 in the direction along the drive shaft 31, the primary It is possible to close the molding dies 33 and the secondary molding dies 41 in a state where both are synchronized (see FIGS. 6 and 10).

  Further, by moving the drive shaft 31 together with the mounting plate 32 and the two common molds 35 and 36 in a direction along the drive shaft 31 to a side away from the primary mold 34 and the secondary mold 42, the primary shaft is moved. It is possible to open the mold in a state where the molding die 33 and the secondary molding die 41 are both synchronized (see FIGS. 3, 8, and 14).

  The closing and opening of the primary molding die 33 may be performed by moving the common dies 35 and 36, which do not hold the primary resin portion 11, toward and away from the primary die 34. (See FIGS. 3, 6, 9, and 10). The closing and opening of the primary molding die 33 include the case where the common dies 35 and 36 holding the primary resin portion 11 are moved toward and away from the primary die 34. (See FIGS. 7, 8, 13, and 14).

  In closing and opening the secondary molding die 41, the common dies 35 and 36, which do not hold any of the primary resin part 11 and the secondary resin part 21, approach the secondary die 42. And cases in which they are separated from each other (see FIGS. 3, 6, 7, and 8). Further, in closing and opening the mold of the secondary molding die 41, the common dies 35, 36 holding at least the primary resin portion 11 of the primary resin portion 11 and the secondary resin portion 21 are connected to the secondary mold 42. , And the case where the distance is approached and separated from the distance (see FIGS. 9, 10, 13, and 14).

  As shown in FIGS. 6 and 10, when the common molds 35 and 36, which do not hold the primary resin portion 11, approach the primary mold 34, and when the primary molding mold 33 is closed, A primary cavity 37 which is a space for molding the primary resin portion 11 is formed between the common molds 35 and 36 and the primary mold 34. As shown in FIG. 6, primary gates 38 which are entrances of the primary resin material 17 into the primary cavity 37 are provided at a plurality of locations facing the primary cavity 37 in the common molds 35 and 36. Each of the primary gates 38 is set at a position where the rib 15 (see FIGS. 1 and 7) of the primary resin portion 11 is formed in the common molds 35 and 36.

  Further, as shown in FIGS. 9 and 10, when the common mold 35 (36) holding the primary resin portion 11 approaches the secondary mold 42, the secondary molding mold 41 is closed. Then, a secondary cavity 43 which is a space for molding the secondary resin portion 21 is formed between the primary resin portion 11, the common mold 35 (36), and the secondary mold 42. As shown in FIGS. 10, 11, and 12 (a), a plurality of locations facing the secondary cavity 43 in the secondary mold 42 are entrances of the secondary resin material 25 into the secondary cavity 43. A secondary gate 44 is provided. Each secondary gate 44 is set in the secondary mold 42 at a position where each vertical wall portion 24 of the secondary resin portion 21 is molded, more specifically, at a central portion in the circumferential direction of the cylindrical portion 12.

  Further, as shown in FIGS. 5 and 11, the secondary mold 42 includes a plurality of ridges 45 extending along the drive shaft 31. Here, the term “plurality” means twice the number of the concave portions 13 in the primary resin portion 11. In other words, two protrusions 45 are provided for each recess 13. The two projecting ridges 45 for each of the recesses 13 are provided at positions where the recesses 13 are sandwiched from both sides in the circumferential direction of the cylindrical portion 12 in the primary resin portion 11. In other words, two ridges 45 for each recess 13 are provided at locations facing each other with each secondary gate 44 interposed therebetween.

  As shown in FIGS. 12A and 12B, each ridge 45 has a semicircular cross-sectional shape. Each ridge 45 is desirably provided at a position close to the recess 13. In the present embodiment, the distance D1 between each ridge 45 and the recess 13 is set to 0.2 mm.

  Assuming that the width of each protrusion 45 in the circumferential direction of the cylindrical portion 12 is a width W1, the width W1 is set to 0.6 mm in the present embodiment. Further, the protruding length L1 of each ridge 45 from the secondary mold 42 is desirably 0.03 mm to 0.4 mm, and is set to 0.4 mm in the present embodiment.

<About the manufacturing method of the two-color molded article 10>
Next, as an operation of the present embodiment, a method of manufacturing a plurality of two-color molded products 10 at different timings using the manufacturing apparatus 30 will be described together with effects.

  The molding cycle of each two-color molded article 10 includes a primary molding step and a secondary molding step. The molding cycle of the subsequent two-color molded article 10 is started in the middle of the molding cycle of the preceding two-color molded article 10. Therefore, in the present embodiment, a description will be given mainly of a molding cycle of the preceding two-color molded article 10.

<Primary molding process>
The primary molding step is a step of molding the primary resin portion 11 with the primary resin material 17 using the primary molding die 33.

  The primary molding step is started in a state where both the primary molding die 33 and the secondary die 42 are opened as shown in FIG. In this state, the common mold 35 is separated from the primary mold 34 upward in FIG. 3, and the common mold 36 is separated from the secondary mold 42 upward in FIG.

  As shown by a two-dot chain line arrow A in FIG. 3, the drive shaft 31 is attached to the primary mold 34 and the secondary mold 42 together with the mounting plate 32 and the common dies 35 and 36 (see FIG. 3). As a result, the primary molding die 33 and the secondary molding die 41 are both closed as shown in FIG. In the primary mold 33, a primary cavity 37 is formed between the primary mold 34 and the common mold 35.

  The primary resin material 17 in a molten state is filled in the primary cavity 37 from primary gates 38 provided at a plurality of locations facing the primary cavity 37 in the common mold 35. As shown in FIG. 7, by curing the primary resin material 17 in the primary cavity 37, the primary resin portion 11 harder than the secondary resin portion 21 is formed.

<Secondary molding process>
In FIG. 7, as indicated by a two-dot chain line arrow B, the drive shaft 31 is attached to the mounting plate 32 and both the common molds 35 and 36 and is separated from the primary mold 34 and the secondary mold 42 (FIG. 8, the primary molding die 33 and the secondary molding die 41 are both opened as shown in FIG. 8. The opening of the primary molding die 33 is performed by moving the common die 35 holding the primary resin portion 11 to the side away from the primary die 34 (upper side in FIG. 8). By this mold opening, the primary resin part 11 is removed from the primary mold 34.

  Next, the mounting plate 32 on which the common molds 35 and 36 are mounted is rotated about the drive shaft 31 as indicated by a two-dot chain line arrow C. By this rotation, the common mold 35 is moved from a position facing the primary mold 34 (FIG. 8) to a position facing the secondary mold 42 (FIG. 9). Further, the common mold 36 is moved from the position facing the secondary mold 42 (FIG. 8) to the position facing the primary mold 34 (FIG. 9), and the state is the same as that of FIG. In the primary molding die 33, a cycle for manufacturing the subsequent two-color molded product 10 is started.

  Subsequently, as shown by a two-dot chain line arrow D in FIG. 9, the drive shaft 31 accompanies the primary mold 34 and the secondary mold 42 together with the mounting plate 32 and both common molds 36 and 35 (see FIG. 9). By moving to the lower side of FIG. 9, the primary molding die 33 and the secondary molding die 41 are closed. By closing the mold, the primary resin portion 11 is arranged (set) on the secondary mold 42 as shown in FIG. In the primary molding die 33, a primary cavity 37 for molding the primary resin portion 11 in the subsequent two-color molded product 10 is formed between the primary die 34 and the common die 36. In the secondary molding die 41, a secondary cavity 43 is formed between the primary resin part 11, the common die 35, and the secondary die 42.

  The secondary resin material 25 in a molten state is filled in the secondary cavity 43 through secondary gates 44 provided at a plurality of locations facing the secondary cavity 43 in the secondary mold 42. As shown in FIG. 13, when the secondary resin material 25 is cured in the secondary cavity 43, the secondary resin material 25 contacts the primary resin portion 11 at the flange portion 22 and the vertical wall portion 24 and is softer than the primary resin portion 11. Is molded integrally with the primary resin portion 11.

  Further, as shown in FIG. 10, the primary resin material 17 in a molten state is filled in the primary cavity 37 through primary gates 38 provided at a plurality of locations facing the primary cavity 37 in the common mold 36. As shown in FIG. 13, by curing the primary resin material 17 in the primary cavity 37, the primary resin portion 11 in the subsequent two-color molded product 10 is molded.

  Here, during the period from when the primary resin portion 11 is removed from the primary mold 34 as shown in FIG. 8 to when it is arranged (set) in the secondary mold 42 as shown in FIG. There is a possibility that the resin portion 11 contracts or deforms. Further, when the primary resin portion 11 is disposed on the secondary mold 42, there is a possibility that a positional shift may occur. When the primary resin portion 11 contracted or deformed as described above is placed on the secondary mold 42 or a positional displacement occurs, the secondary resin 42 is located between the secondary mold 42 and the A gap is likely to occur at a location adjacent to the outside of the next cavity 43. In this state, when the secondary resin material 25 is filled in the secondary cavity 43 through the secondary gate 44, a part of the secondary resin material 25 tries to enter the gap.

  However, in the secondary molding step, as shown in FIG. 9, as the secondary mold 42, in the mold closing direction, that is, in the direction along the drive shaft 31, the common mold 35 (36) is the secondary mold 42. The one having a protruding portion 45 extending in a direction approaching is used.

  When the secondary molding die 41 is closed, the hard protruding ridges 45 are placed on the portion of the primary resin portion 11 that is harder than the secondary resin portion 21 and around the secondary cavity 43. While biting (while deforming the primary resin portion 11), the common mold 35 is made to approach the secondary mold 42 as shown by a two-dot chain line arrow E in FIG.

  As shown in FIGS. 12A and 12B, the portion where each ridge 45 cuts into the primary resin portion 11 has no gap between the ridge 45 and the same resin portion 11. This prevents the secondary resin material 25 from leaking out of the secondary cavity 43. The hard primary resin portion 11 is not easily deformed even when a high pressure of the secondary resin material 25 acts. The gap between the primary resin portion 11 and the ridge portion 45 is maintained with a small gap, so that the secondary resin material 25 does not easily flow out (leak). Therefore, it is possible to prevent the secondary resin material 25 from entering the gap and hardening to generate burrs.

  In particular, as shown in FIGS. 11 and 12A, in the secondary molding step, when the secondary resin material 25 in the molten state is filled in the secondary cavity 43, the secondary resin in the secondary cavity 43 is not filled. The pressure of the material 25 is highest at the secondary gate 44, which is the entrance where the secondary resin material 25 flows into the secondary cavity 43.

  In this regard, according to the manufacturing method of the present embodiment, when the secondary molding die 41 is closed in the secondary molding step, the protrusion provided at the position opposed to each other with the secondary gate 44 interposed therebetween. The common mold 35 is made to approach the secondary mold 42 while the ridge 45 cuts into the primary resin part 11 (see FIG. 9). The portion where the two ridges 45 cut into the primary resin portion 11 has no gap.

  For this reason, when the secondary resin material 25 in a molten state with a high pressure is filled in the secondary cavity 43, a phenomenon that the secondary resin material 25 flows out (leaks) to the outside of the secondary cavity 43 is prevented by the projections 45. Therefore, the above-mentioned phenomenon in which the secondary resin material 25 enters the gap and cures to generate burrs can be more effectively suppressed.

  Also, in the secondary molding step, when the secondary molding die 41 is closed, as shown in FIG. The common mold 35 is made to approach the secondary mold 42 while being bitten by the same amount as the protrusion length L1 of the 45 from the secondary mold 42, that is, a depth of 0.03 mm to 0.4 mm ( 9 and 10).

  The biting depth of each ridge 45 into the primary resin portion 11 is 0.03 mm or more. From this, during the period from when the primary resin part 11 is removed from the primary mold 34 to when it is disposed on the secondary mold 42, the primary resin part 11 contracts and deforms, or the primary resin part 11 Even if a positional shift occurs when the protrusions 45 are arranged in the mold 42, the places where the ridges 45 bite into the primary resin portion 11 have no gap. Therefore, an effect of preventing the secondary resin material 25 from flowing out (leakage) out of the secondary cavity 43 can be obtained.

  Further, since the bite depth is 0.4 mm or less, the above-described effects can be obtained, and the secondary molding die 41 can be smoothly closed. In addition, the shape of the primary resin portion 11 can be hardly affected.

  Then, as shown by a two-dot chain line arrow F in FIG. 13, the drive shaft 31 is attached to the mounting plate 32 and both the common molds 36 and 35, and is separated from the primary mold 34 and the secondary mold 42 (see FIG. 13). 13, the primary molding die 33 and the secondary molding die 41 are opened as shown in FIG.

  The opening of the primary molding die 33 is such that the common die 36 holding the primary resin portion 11 in the subsequent two-color molded product 10 moves to the side (upper side in FIG. 14) away from the primary die 34. Made by By this mold opening, the primary resin part 11 is removed from the primary mold 34. The primary molding die 33 is in the same state as in FIG. 8 described above.

  As shown in FIG. 14, the secondary mold 41 is opened toward the side (upper side in FIG. 14) where the common mold 35 holding the preceding two-color molded product 10 is separated from the secondary mold 42. This is done by moving. Thereafter, the cycle of manufacturing the preceding two-color molded article 10 is completed by removing the two-color molded article 10 from the common mold 35.

  Thereafter, the manufacturing apparatus 30 operates in the same manner as the operation for molding the preceding two-color molded article 10 described with reference to FIGS. The color molded product 10 is formed.

The above embodiment can be implemented as a modified example in which this is changed as follows.
-The primary resin part 11 may be formed with the primary resin material 17 of a kind different from the said embodiment. Similarly, the secondary resin portion 21 may be formed of a secondary resin material 25 of a type different from the above embodiment.

The secondary resin portion 21 may be formed of a hard secondary resin material 25 similarly to the primary resin material 17 provided that the secondary resin portion 21 is of a different type from the primary resin material 17.
-The cross-sectional shape of each ridge 45 may be changed to a shape different from a semicircle.

  When moving the common molds 35 and 36 from the position facing the primary mold 34 to a position facing the secondary mold 42, or moving the latter from the latter position to the former position, It may be performed by an operation different from rotation.

  The method of manufacturing a two-color molded article is a manufacturing method that includes an operation of removing the primary resin portion 11 from the primary mold 34 and disposing (set) it in the secondary mold 42 in the secondary molding step. For example, it can be widely applied to the production of a two-color molded product different from the duct quarter vent.

  10: two-color molded product, 11: primary resin part, 17: primary resin material, 21: secondary resin part, 25: secondary resin material, 33: primary molding die, 34: primary die, 35, 36 ... Common mold, 37: Primary cavity, 41: Secondary molding mold, 42: Secondary mold, 43: Secondary cavity, 44: Secondary gate, 45: Protrusion.

Claims (5)

A primary resin mold comprising a common mold and a primary mold, and a secondary molding mold comprising the common mold and a secondary mold, a primary resin portion made of a primary resin material, and a secondary resin material. A method for producing a two-color molded product formed integrally with a secondary resin part consisting of
Upon closing the mold of the primary molding die, a primary molding step of molding the primary resin portion by filling the primary resin material into a primary cavity formed between the primary mold and the common mold,
The primary molding die and the secondary molding die are both opened, and the common mold in a state where the primary resin portion is held is opposed to the secondary mold from a position opposed to the primary mold. After moving to the position where the primary mold and the secondary mold are closed, a secondary cavity is formed between the common mold, the primary resin portion, and the secondary mold. A secondary molding step of filling the secondary cavity with the secondary resin material from a secondary gate and molding the secondary resin portion in a state of being in contact with the primary resin portion, In the step, as the secondary mold, a mold having a ridge extending in a mold closing direction is used, and at the time of closing the mold of the secondary molding mold, the ridge is included in the primary resin part. The common mold is moved forward while biting into a location around the secondary cavity. Method for producing a two-color molded article to be close to the secondary mold.   The method for manufacturing a two-color molded product according to claim 1, wherein in the primary molding step, the primary resin portion is molded using the primary resin material that is harder than the secondary resin material.   3. The two-color molding according to claim 1, wherein in the secondary molding step, a mold provided with the ridge portion at a position facing each other across the secondary gate is used as the secondary mold. 4. Product manufacturing method.   4. The production of the two-color molded product according to claim 1, wherein in the secondary molding step, the ridge portion is made to bite into the primary resin portion by a depth of 0.03 mm to 0.4 mm. 5. Method.   The method for producing a two-color molded product according to any one of claims 1 to 4, wherein the two-color molded product is a duct quarter vent of an automobile.