JP2014168936A - Injection molding method, mold, and two-color molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for injection molding a two-color molded product, which prevents a primary molded product from being unintentionally detached from a cavity-side mold.SOLUTION: A two-color molded product 10 is injection molded with a mold 50 of which a pair of cavity-side molds 58A and 58B are fixed to a rotary member 56 rotatably disposed around a Y-axis extending between a primary core-side mold 52 and a secondary core-side mold 54. On this occasion, a hydraulic cylinder 70 disposed at each of the cavity-side molds 58A and 58B projects a plunger 72 into a primary space part C1 from a direction orthogonal to the mold opening/closing direction prior to molding of a primary molded product 12, so that the plunger 72 engages with the primary molded product 12. Consequently, when the primary core-side mold 52 and the cavity-side mold 58A are opened, the primary molded product 12 in a state held by the cavity-side mold 58A is detached from the primary core-side mold 52. The primary molded product 12 is kept in the state held by the cavity-side mold 58A, when the rotary member 56 rotates thereafter.

Description

  The present invention relates to a method, a mold, and a two-color molded product for injection molding a two-color molded product in which a secondary molded product is arranged around the primary molded product.

  Conventionally, as a method of injection molding, a method of injection molding a two-color molded product in which a secondary molded product is arranged around a primary molded product is known.

  In “Patent Document 1”, as a mold for performing such injection molding, a primary core side mold and a secondary core side mold, which are arranged at positions apart from each other, and these primary core side molds are disclosed. A rotating member arranged to be rotatable around an axis passing between the mold and the secondary core side mold, and a state in which the primary core side mold and the secondary core side mold can be clamped with respect to the rotating member And a pair of cavity-side molds fixed in the above.

  The injection molding of a two-color molded product using the mold described in “Patent Document 1” is performed as follows.

  That is, between the primary core side mold and the first cavity side mold in a state in which the primary core side mold and the secondary core side mold and the pair of cavity side molds are clamped. The first resin material is injected into the primary space portion to form the primary molded product, and then the primary core side mold and the secondary core side mold are opened, and the rotating member is After rotating 180 °, the primary core side mold and the secondary core side mold are clamped again to form a secondary formed between the secondary core side mold and the first cavity side mold. The secondary molded product is molded by injecting the second resin material into a portion other than the primary molded product in the space.

JP 2006-142805 A

  As described in “Patent Document 1”, using a mold configured to rotate a pair of cavity-side molds with respect to a primary core-side mold and a secondary core-side mold. If injection molding of a two-color molded product is performed, even if there is an undercut in the portion of the secondary molded product, by placing the slide core on the secondary core side mold side, The two-color molded product can be molded without any trouble.

  However, when such a mold is used to perform injection molding of a two-color molded product, there are the following problems.

  That is, since the primary molded product is to be attached to the primary core side mold by the shrinking action of the resin material injected into the primary space, the primary core side mold and the secondary core side mold are molded. There is a problem that it becomes difficult to maintain the state where the primary molded product is held in the cavity side mold when opened.

  Even if the primary molded product can be maintained in the cavity-side mold, the holding force is small, so the position of the primary molded product is shifted when the rotating member rotates, Depending on the mold structure, there is a problem that the primary molded product rotating together with the rotating member is detached from the cavity side mold by centrifugal force.

  The present invention has been made in view of such circumstances, and can be rotated around an axis passing between the primary core side mold and the secondary core side mold when injection molding a two-color molded product. Even when a mold in which a pair of cavity side molds are fixed to the rotating member arranged in the above is used, the primary molded product may be inadvertently detached from the cavity side mold. An object of the present invention is to provide an injection molding method, a mold, and a two-color molded product that can be prevented.

  The present invention is intended to achieve the above object by using a predetermined in / out mechanism.

That is, the injection molding method according to the present invention is:
A method of injection molding a two-color molded product in which a secondary molded product is arranged around a primary molded product,
The primary core side mold and the secondary core side mold, which are arranged at positions separated from each other, and the axis disposed between the primary core side mold and the secondary core side mold are rotatably arranged. A mold comprising: a rotating member; and a pair of cavity-side molds fixed to the rotating member and the primary core-side mold and the secondary core-side mold in a mold-clampable state. Use
First, the primary core side mold and the secondary core side mold and the pair of cavity side molds are clamped to contact the primary core side mold and the primary core side mold. Injecting the first resin material into the primary space formed between the first cavity side mold in contact with the first mold, and molding the primary molded product,
Next, the primary core side mold and the secondary core side mold and the pair of cavity side molds are opened, and the rotating member is rotated by 180 ° around the axis,
Next, the primary core side mold and the secondary core side mold and the pair of cavity side molds are clamped to form the secondary core side mold and the secondary core side mold. Injecting the second resin material into a portion other than the primary molded product in the secondary space formed between the first cavity side mold that is in contact with the first mold, and molding the secondary molded product, This completes the two-color molded product,
Next, the primary core side mold and the secondary core side mold and the pair of cavity side molds are opened to take out the two-color molded product,
At that time, in each of the cavity side molds, an in / out mechanism configured to project at least one protrusion in the primary space from a direction intersecting the mold opening / closing direction is arranged in advance.
Before forming the primary molded product, the protrusion protrudes into the primary space, and then after the rotating member is rotated until the two-color molded product is taken out from the secondary space. The protrusion is retracted.

In addition, the mold according to the present invention is
A mold for injection molding a two-color molded product in which a secondary molded product is arranged around the primary molded product,
A primary core side mold and a secondary core side mold, which are arranged at positions separated from each other;
A rotating member arranged to be rotatable around an axis passing between the primary core side mold and the secondary core side mold;
A pair of cavity side molds fixed to the rotating member in a state capable of being clamped to the primary core side mold and the secondary core side mold;
Each of these cavity side molds is formed between the primary core side mold and the first cavity side mold in contact with the primary core side mold from a direction intersecting the mold opening / closing direction. And a projecting and retracting mechanism configured to project the protruding portion into the primary space portion.

Furthermore, the two-color molded product according to the present invention is:
A two-color molded product in which a secondary molded product is arranged around the primary molded product,
At least one recess is formed on the outer peripheral surface of the primary molded product.

  In the present invention, the use of the two-color molded product is not particularly limited, and the specific configurations of the primary and secondary molded products are not particularly limited.

  If the “secondary molded product” is arranged around the primary molded product, it is not always necessary to arrange the secondary molded product over the entire circumference.

  The “mold opening / closing direction” means a direction in which the primary core side mold and the secondary core side mold and the pair of cavity side molds move relative to each other during mold clamping and mold opening. is there.

  The specific value of the intersecting angle is not particularly limited as long as the direction in which the “projection” projects is a direction intersecting the mold opening / closing direction.

  The specific value of the protrusion amount of the “protrusion” into the primary space is not particularly limited.

  The specific configuration of the “investment mechanism” is not particularly limited. For example, a hydraulic cylinder, an air cylinder, or the like can be employed, and a mechanism using a spring, an angular pin, or the like can also be employed.

  As shown in the above configuration, in the present invention, a pair of cavity side molds are fixed to a rotating member that is rotatably arranged around an axis passing between the primary core side mold and the secondary core side mold. The two-color molded product is injection-molded using the formed mold, but at that time, the primary space is formed before the primary molded product is molded by the protruding and retracting mechanism arranged in each cavity side mold. Since the protrusion protrudes from the secondary space part after the protrusion protrudes from the part, and after the rotating member is rotated until the two-color molded product is taken out, the following effects are obtained. Can be obtained.

  That is, the primary molded product tries to stick to the primary core side mold by the shrinking action of the resin material injected into the primary space, but the primary molded product has a direction intersecting the mold opening / closing direction. Since the projecting part is engaged, the primary molded product is released from the primary core side mold while being held by the cavity side mold when the primary core side mold and the cavity side mold are opened. Will be. Further, after that, even when centrifugal force acts on the primary molded product when the rotating member rotates, the primary molded product remains maintained in the cavity side mold. .

  As described above, according to the present invention, when a two-color molded product is injection-molded, a pair of rotating members are arranged so as to be rotatable around an axis passing between the primary core side mold and the secondary core side mold. Even when a mold having the cavity side mold fixed thereto is used, it is possible to prevent the primary molded product from being carelessly detached from the cavity side mold. And thereby, a two-color molded product can be molded without any trouble.

  In the above configuration, if a hydraulic cylinder configured to reciprocate the protrusion in the direction orthogonal to the mold opening / closing direction is used as the protrusion / distraction mechanism, the protrusion / disengagement operation of the protrusion can be easily performed. In addition, it is possible to ensure that the protrusion is engaged with the primary molded product.

  In the above configuration, the two-color molded product to be injection-molded is a translucent cover for a vehicle lamp, the primary molded product is composed of a transparent resin member, and the secondary molded product is an opaque resin. In the case of being composed of members, the primary molded product is relatively large and heavy, and therefore, the centrifugal force acting when the rotating member rotates is increased, and it is easy to separate from the cavity side mold. Therefore, it is particularly effective to adopt the configuration of the present invention.

Side sectional view which shows the metal mold | die used for the injection molding method which concerns on one Embodiment of this invention. Side sectional view showing a two-color molded product molded by the injection molding method Process diagram of the injection molding method (Part 1) Process diagram of the injection molding method (part 2) Process diagram of the injection molding method (part 3) Process diagram of the injection molding method (part 4) The same figure as FIG.6 (g) which shows the modification of the said embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a side sectional view showing a mold 50 used in an injection molding method according to an embodiment of the present invention. FIG. 2 is a side sectional view showing the two-color molded product 10 that is injection-molded by the injection molding method according to the present embodiment.

  First, the configuration of the two-color molded product 10 will be described.

  As shown in FIG. 2, the two-color molded product 10 is a translucent cover for a vehicle lamp such as a headlamp, and has a front surface portion 10A and a peripheral surface portion 10B extending rearward from the outer peripheral edge of the front surface portion 10A. And. At that time, a flange portion 10Ba extending from the rear end position toward the outer peripheral side and an annular projection portion 10Bb protruding rearward from the rear surface are formed on the peripheral surface portion 10B.

  The two-color molded product 10 has a configuration in which a secondary molded product 14 is arranged around the primary molded product 12. At that time, the primary molded product 12 is made of a transparent resin member, and the secondary molded product 14 is made of an opaque (specifically, black) resin member.

  These primary and secondary molded products 12 and 14 are configured to be partially overlapped with the primary molded product 12 positioned on the outer peripheral side in the peripheral surface portion 10B. At that time, the rear end surface 12c of the primary molded product 12 is located at an intermediate portion in the front-rear direction of the peripheral surface portion 10B. A plurality of recesses 12b are formed in the outer peripheral surface of the primary molded product 12 (that is, the outer surface of the peripheral surface portion 10B where the primary molded product 12 is located) (this will be described later). .

  Next, the configuration of the mold 50 will be described.

  As shown in FIG. 1, the mold 50 is configured as a so-called opposed type two-color molding mold.

  That is, the mold 50 includes a primary core side mold 52 and a secondary core side mold 54 that are disposed facing each other on the X axis extending in the horizontal direction, and the primary core side mold 52 and Between the secondary core-side molds 54, the rotating member 56 disposed so as to be rotatable around the Y axis extending perpendicularly to the X axis and fixed to the rotating member 56 in a back-to-back state with respect to the Y axis. A pair of cavity side molds 58A and 58B having the same shape, a movable plate 62 for supporting the primary core side mold 52, and a fixed plate 64 for supporting the secondary core side mold 54 are provided.

  At this time, the rotating member 56 can move in the X-axis direction with respect to the fixed platen 64, and the movable platen 62 can move in the X-axis direction with respect to the rotating member 56. . In FIG. 1, the direction of these relative movements is indicated by arrows.

  In the mold 50, the movable plate 62 supports the primary space C1 formed between the primary core-side mold 52 and the first cavity-side mold 58A that are in contact by clamping. A transparent resin material supplied from the heating cylinder 66 is injected, and a secondary space C2 is formed between the secondary core side mold 54 and the second cavity side mold 58B that are in contact with each other by clamping. In addition, a black resin material supplied from a heating cylinder 68 supported by the fixed plate 64 is injected.

  In this mold 50, hydraulic cylinders 70 are arranged at a plurality of locations on the respective cavity side molds 58A and 58B. At this time, the plurality of hydraulic cylinders 70 are arranged at predetermined intervals in the circumferential direction so that the plunger 72 faces the inner peripheral surface of each cavity-side mold 58A, 58B. As a result, each of the hydraulic cylinders 70 is configured such that the plunger 72 can protrude into the primary space C1 from the direction orthogonal to the X axis.

  Next, the injection molding method according to this embodiment will be described.

  3 to 6 are process diagrams showing this injection molding method.

  First, as shown in FIG. 3A, the primary core side mold 52 and the secondary core side mold 54 and the pair of cavity side molds 58A and 58B are clamped. At that time, the plunger 72 of each hydraulic cylinder 70 arranged in the cavity side mold 58A on the primary core side mold 52 side is protruded into the primary space C1. On the other hand, the plunger 72 of each hydraulic cylinder 70 disposed in the cavity side mold 58B on the secondary core side mold 54 side is set in a state of being retracted from the secondary space C2. In this state, as shown in FIG. 3B, the transparent resin material supplied from the heating cylinder 66 is injected into the primary space C1, and the primary molded product 12 is molded.

  The primary molded product 12 is in a state in which a plurality of plungers 72 are engaged from a direction orthogonal to the mold opening and closing direction. As shown in FIG. As a result, a plurality of recesses 12 b are formed on the outer peripheral surface 12 a of the primary molded product 12.

  Next, as shown in FIG. 4C, the primary core side mold 52 and the secondary core side mold 54 and the pair of cavity side molds 58A and 58B are opened. At this time, the primary molded product 12 tries to stick to the primary core side mold 52 by the shrinking action of the resin material injected into the primary space C1, and the primary molded product 12 includes a mold. Since the plunger 72 is engaged from the direction orthogonal to the opening / closing direction, when the primary core side mold 52 and the cavity side mold 58A are opened, the primary molded product 12 is held by the cavity side mold 58A. It leaves | separates from the primary core side metal mold | die 52 with being made. In this state, as shown in FIG. 4D, the rotating member 56 is rotated 180 ° around the Y axis. At this time, centrifugal force acts on the primary molded product 12 held by the rotating member 56, but since the plunger 72 is engaged with the primary molded product 12, it is held by the cavity side mold 58A. The state as it is is maintained.

  Next, as shown in FIG. 5E, the primary core side mold 52 and the secondary core side mold 54 and the pair of cavity side molds 58A and 58B are clamped. In this state, as shown in FIG. 5 (f), the black resin material supplied from the heating cylinder 68 is injected into a portion other than the primary molded product 12 in the secondary space C2 to form the secondary molded product. 14 is molded. Thus, the two-color molded product 10 in which the primary molded product 12 and the secondary molded product 14 are integrated is completed.

  Next, as shown in FIG. 6 (g), after the plunger 72 of each hydraulic cylinder 70 disposed in the cavity side mold 58A on the secondary core side mold 54 side is retracted from the secondary space C2, The primary core side mold 52 and the secondary core side mold 54 and the pair of cavity side molds 58A and 58B are opened. At this time, since the plunger 72 is not engaged with the primary molded product 12, the two-color molded product 10 is attached to the secondary core side mold 54 when the mold is opened. In this state, the two-color molded product 10 is taken out as shown in FIG. This extraction is performed by extruding the two-color molded product 10 attached to the secondary core side mold 54 with an unillustrated extrusion pin and gripping it with an unillustrated unloader.

  Next, the effect of this embodiment is demonstrated.

  In the present embodiment, a pair of cavity-side molds 58 </ b> A is disposed on a rotating member 56 that is rotatably arranged around the Y axis as an axis passing between the primary core-side mold 52 and the secondary core-side mold 54. The two-color molded product 10 is injection-molded using the mold 50 to which the 58B is fixed. At this time, the hydraulic cylinder 70 serving as a retracting mechanism disposed in each cavity-side mold 58A, 58B. Thus, before molding the primary molded product 12, the plunger 72 as the protrusion is protruded from the direction perpendicular to the mold opening / closing direction into the primary space C <b> 1, and then the rotating member 56 is rotated before the two colors. Since the plunger 72 is withdrawn from the secondary space C2 before the molded product 10 is taken out, the following operational effects can be obtained.

  That is, the primary molded product 12 tries to stick to the primary core side mold 52 by the shrinking action of the resin material injected into the primary space C1, and the primary molded product 12 has a mold opening / closing direction. Since the plunger 72 is engaged from the direction orthogonal to the primary mold side 52 and the cavity side mold 58A, the primary molded product 12 is held by the cavity side mold 58A when the mold is opened. It will be detached from the primary core side mold 52. Thereafter, when the rotating member 56 rotates, centrifugal force acts on the primary molded product 12, but the primary molded product 12 is maintained in the cavity-side mold 58 </ b> A.

  As described above, according to the present embodiment, when the two-color molded product 10 is injection-molded, it is disposed so as to be rotatable around the Y axis passing between the primary core side mold 52 and the secondary core side mold 54. Even when the mold 50 in which the pair of cavity side molds 58A and 58B is fixed to the rotating member 56 is used, the primary molded product 12 is inadvertently detached from the cavity side molds 58A and 58B. Can be prevented in advance. As a result, the two-color molded product 10 can be molded without any trouble.

  In particular, the mold 50 according to the present embodiment is configured as a two-color molding mold of an opposite type, and when the rotating member 56 rotates, the primary molded product 12 is detached from the cavity side mold 58A. Since the centrifugal force in the direction to act acts, it is extremely effective to adopt the configuration of this embodiment.

  Further, in the present embodiment, since the hydraulic cylinder 70 configured to reciprocate the plunger 72 in a direction orthogonal to the mold opening / closing direction is used as the protruding and retracting mechanism, the protruding and retracting operation of the plunger 72 is easy. And the engagement of the plunger 72 with the primary molded product 12 can be ensured.

  Further, in the present embodiment, the two-color molded product 10 to be subjected to injection molding is a translucent cover for a vehicular lamp, and the primary molded product 12 is formed of a transparent resin member and the secondary molded product. Since the product is made of an opaque resin member, the primary molded product 12 is relatively large and heavy. For this reason, the centrifugal force acting on the primary molded product 12 when the rotating member 56 rotates is increased, and the primary molded product 12 is easily detached from the cavity-side mold 58A. Therefore, it is particularly effective to adopt the configuration of this embodiment.

  By the way, the amount of protrusion of each plunger 72 into the primary space C1 is such that when the plunger 72 is engaged with the primary molded product 12 more reliably, the amount of protrusion is as a trace of the engagement. The concave portions 12b formed in the primary molded product 12 are deepened, and a paint such as a hard coat is easily collected. Therefore, the value of the protrusion amount is preferably set to about 0.1 to 1 mm, and more preferably set to about 0.3 to 0.7 mm.

  In the above embodiment, as shown in FIG. 6G, the plunger 72 is retracted before the secondary core side mold 54 and the cavity side mold 58A are opened. It is also possible to retract the plunger 72 after opening the core side mold 54 and the cavity side mold 58A. In this case, the two-color molded product 10 with the plunger 72 engaged with the portion of the primary molded product 12 is held in the cavity-side mold 58A, but then the plunger 72 is retracted. By doing so, the holding power of the two-color molded product 10 by the cavity side mold 58A becomes small, so that the two-color molded product 10 can be easily taken out.

  In the above embodiment, the hydraulic cylinders 70 are described as being disposed at a plurality of locations on each cavity-side mold 58A, 58B, but the configuration is such that the hydraulic cylinder 70 is disposed at only one location. In addition, depending on the shape of the primary molded product 12, it is possible to prevent separation from the cavity side mold 58A.

  In the above-described embodiment, the plunger 72 of each hydraulic cylinder 70 is configured to protrude into the primary space C1 from the direction orthogonal to the X axis, but the primary molded product 12 from the cavity side mold 58A As long as it is within a range where it is possible to prevent detachment, it is also possible to adopt a configuration that projects into the primary space C1 from a direction inclined with respect to a direction orthogonal to the X axis.

  In the above-described embodiment, the plunger 72 of each hydraulic cylinder 70 is configured to protrude into the primary space C1 on the front side of the position of the rear end surface 12c of the primary molded product 12. It is also possible to adopt a configuration that protrudes into the primary space C1 in such a manner that a part of the shape of the rear end surface 12c of the primary molded product 12 is formed.

  In the said embodiment, although the two-color molded product 10 used as the object of injection molding was demonstrated as what is a translucent cover of a vehicle lamp, it aimed at other resin molded products, such as a sunroof and a rear window, for example. Even in this case, the same effect as that of the above embodiment can be obtained.

  Next, a modification of the above embodiment will be described.

  FIG. 7 is a view similar to FIG. 6G, showing an outline of the injection molding method according to the present modification.

  As shown in the figure, also in this modification, the configuration of the two-color molded product 10 that is the object of injection molding is the same as that in the above embodiment, and the configuration of the mold 150 is also primary. The structure itself of the core side mold 152 and the secondary core side mold 154 and the pair of cavity side molds 158A and 158B is the same as that in the above embodiment, but the arrangement is different from that in the above embodiment. Yes.

  That is, this mold 150 is a so-called rotary type two-color molding mold, and the primary core side mold 152 and the secondary core side mold 154 are arranged upward at positions apart from each other, Between the primary core side mold 152 and the secondary core side mold 154, a pair of cavity side molds 158 </ b> A having the same shape are arranged on a rotating member 156 that is rotatably arranged around the Y axis extending in the vertical direction. 158B is arranged in a downward direction. The pair of cavity side molds 158A and 158B move in the vertical direction together with the rotating member 156, whereby the primary core side mold 152 and the secondary core side mold 154 and the pair of cavity side molds 158A, Mold clamping and mold opening with 158B are performed.

  Then, the primary molded product 12 is molded in a state where the plunger 172 of each hydraulic cylinder 170 arranged in the cavity side mold 158B on the primary core side mold 152 side protrudes into the primary space portion, Before the secondary core side mold 154 and the cavity side mold 158A are opened, the plungers 172 of the hydraulic cylinders 170 disposed in the cavity side mold 158A are retracted from the secondary space.

  Even in the case of adopting the configuration of this modified example, since the plunger 172 is engaged with the primary molded product 12 from the direction orthogonal to the mold opening / closing direction, the primary core side mold 152 and the cavity side mold are engaged. When the mold 158B is opened, the primary molded product 12 is detached from the primary core side mold 152 while being held by the cavity side mold 158B, and centrifugal force and impact force when the rotating member 156 is rotated. Thus, the primary molded product 12 is maintained in the cavity-side mold 158B without any positional deviation.

  Thus, also in this modification, the same operation effect as the above-mentioned embodiment can be obtained.

  In addition, the numerical value shown as a specification in the said embodiment and its modification is only an example, and of course, you may set these to a different value suitably.

  The invention of the present application is not limited to the configuration described in the above-described embodiment and its modifications, and a configuration with various other changes can be adopted.

DESCRIPTION OF SYMBOLS 10 Two-color molded product 10A Front surface part 10B Peripheral surface part 10Ba Flange part 10Bb Annular protrusion 12 Primary molded product 12a Outer peripheral surface 12b Recessed part 12c Rear end surface 14 Secondary molded product 50, 150 Mold 52, 152 Primary core side mold 54, 154 Secondary core side mold 56, 156 Rotating member 58A, 58B, 158A, 158B Cavity side mold 62 Movable plate 64 Fixed plate 66, 68 Heating cylinder 70, 170 Hydraulic cylinder (extruding mechanism)
72, 172 Plunger (protrusion)
C1 primary space C2 secondary space

Claims (5)

A method of injection molding a two-color molded product in which a secondary molded product is arranged around a primary molded product,
The primary core side mold and the secondary core side mold, which are arranged at positions separated from each other, and the axis disposed between the primary core side mold and the secondary core side mold are rotatably arranged. A mold comprising: a rotating member; and a pair of cavity-side molds fixed to the rotating member and the primary core-side mold and the secondary core-side mold in a mold-clampable state. Use
First, the primary core side mold and the secondary core side mold and the pair of cavity side molds are clamped to contact the primary core side mold and the primary core side mold. Injecting the first resin material into the primary space formed between the first cavity side mold in contact with the first mold, and molding the primary molded product,
Next, the primary core side mold and the secondary core side mold and the pair of cavity side molds are opened, and the rotating member is rotated by 180 ° around the axis,
Next, the primary core side mold and the secondary core side mold and the pair of cavity side molds are clamped to form the secondary core side mold and the secondary core side mold. Injecting the second resin material into a portion other than the primary molded product in the secondary space formed between the first cavity side mold that is in contact with the first mold, and molding the secondary molded product, This completes the two-color molded product,
Next, the primary core side mold and the secondary core side mold and the pair of cavity side molds are opened to take out the two-color molded product,
At that time, in each of the cavity side molds, an in / out mechanism configured to project at least one protrusion in the primary space from a direction intersecting the mold opening / closing direction is arranged in advance.
Before forming the primary molded product, the protrusion protrudes into the primary space, and then after the rotating member is rotated until the two-color molded product is taken out from the secondary space. An injection molding method, wherein the protrusion is retracted.   The injection molding method according to claim 1, wherein a hydraulic cylinder configured to reciprocate the protrusion in a direction orthogonal to the mold opening / closing direction is used as the intrusion mechanism.   The two-color molded product is a translucent cover for a vehicular lamp, the primary molded product is made of a transparent resin member, and the secondary molded product is made of an opaque resin member. The injection molding method according to claim 1 or 2, characterized in that A mold for injection molding a two-color molded product in which a secondary molded product is arranged around the primary molded product,
A primary core side mold and a secondary core side mold, which are arranged at positions separated from each other;
A rotating member arranged to be rotatable around an axis passing between the primary core side mold and the secondary core side mold;
A pair of cavity side molds fixed to the rotating member in a state capable of being clamped to the primary core side mold and the secondary core side mold;
Each of these cavity side molds is formed between the primary core side mold and the first cavity side mold in contact with the primary core side mold from a direction intersecting the mold opening / closing direction. And a projecting and retracting mechanism configured to project the projecting portion into the primary space portion. A two-color molded product in which a secondary molded product is arranged around the primary molded product,
A two-color molded product, wherein at least one recess is formed on the outer peripheral surface of the primary molded product.

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