Method and apparatus for manufacturing molded products

Abstract

The present invention provides a method for manufacturing molded products and a manufacturing apparatus that can suppress damage to the molded products. [Solution] The ejection mechanism 50 ejects the molded product during the mold opening operation.

Description

Technical Field

[0001] The present invention relates to a method and an apparatus for manufacturing a molded product.

Background Art

[0002] In an injection molding machine, when taking out the molded product from the mold after molding, the molded product may be pushed out by a movable mold ejector rod.

[0003] Patent Document 1 discloses a method in which an ejector pin for pushing out a molded product is provided, a hole portion communicating with a cavity and a flow path communicating with the hole portion are formed, and the ejector pin moves by the pressure from the working fluid supplied to the hole portion through the flow path to push out and take out the molded product. In the method of Patent Document 1, after molding the molded product and opening the mold, the ejector pin is driven to push out and take out the molded product.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the method of Patent Document 1, during mold opening or while the mold is being opened, the molded product may not be held by the mold on the desired side, and may be damaged by the action of unnecessary forces.

[0006] Therefore, the present invention provides a method and an apparatus for manufacturing a molded product that can suppress damage to the molded product during mold opening.

Means for Solving the Problems

[0007] Therefore, the present invention provides a method for manufacturing a molded article, comprising: a mold closing step of closing a first mold and a second mold to form a space inside the closed mold; an injection step of injecting molten resin into the space to form a molded article; a mold opening step of opening the first mold and the second mold; and an ejection step of using an ejection mechanism provided in either the first mold or the second mold to eject the molded article toward the other mold, thereby holding the molded article in the other mold, wherein the ejection step is performed while the mold opening step is being carried out. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a method for manufacturing molded articles and a manufacturing apparatus that can suppress damage to molded articles during mold opening. [Brief explanation of the drawing]

[0009] [Figure 1] This is a diagram showing a conventional injection molding machine. [Figure 2] This diagram shows the state after mold opening in a conventional injection molding machine. [Figure 3] This is an exploded perspective view of a print head, including a single molded part consisting of three components. [Figure 4] This diagram shows the manufacturing process for a one-piece molded product consisting of three parts, in chronological order. [Figure 5] This diagram shows the molding process for molded products in order of steps. [Figure 6] This is a diagram showing a modified example. [Figure 7] This diagram shows the molding process for molded products in order of steps. [Figure 8] This is a diagram showing a modified example. [Modes for carrying out the invention]

[0010] (First embodiment) A first embodiment of the present invention will be described below with reference to the drawings.

[0011] Figure 1 is a schematic diagram of an injection molding machine 100 equipped with an ejector mechanism. The injection molding machine 100 comprises a first mold 02 and a second mold 03, the first mold 02 being connected to a first injection unit 05 and a second injection unit 06. The second mold 03 is equipped with an ejector rod 04 and an ejector pin 07. With the first mold 02 and the second mold 03 closed, resin is ejected from the first injection unit 05 or the second injection unit 06 to form a molded product 15 in the cavity. Figure 1 shows the state after the mold has been opened after the molded product 15 has been formed. If the mold is opened normally, the molded product 15 will separate from the first mold 02 and be held in the second mold 03. After such mold opening, the molded product 15 is removed from the second mold 03 by pushing the ejector pin 07 in the Y direction.

[0012] Figure 2 shows an example of what happens when normal mold opening does not occur after resin molding is performed in the injection molding machine 100 shown in Figure 1. Note that the injection unit is omitted in Figure 2. Figure 2(a) shows a state in which the molded product 15 is not held by the second mold 03 but moves along with the first mold 02 (hereinafter referred to as "taken") and separates from the second mold 03. In the first mold 02, proper holding force is not obtained, so the posture of the molded product 15 is also disrupted. Figure 2(b) shows a state in which the molded product 15 is held in the cavity of the second mold 03, but is taken by the first mold 02 during mold opening and its posture is disrupted in the second mold 03.

[0013] Thus, during mold opening, the molded product 15 may not detach properly from the mold. In particular, if the shape of the molded product 15 is complex or the size is large, the risk of "getting stuck" increases, and the molded product becomes difficult to hold in the desired position in the mold. If the position of the molded product 15 is disrupted due to getting stuck during mold opening, the molded product may be partially damaged.

[0014] FIG. 3 is an exploded perspective view of a print head 30 that can be adopted in the present embodiment. In the present embodiment, an integrally molded product 18 that constitutes a part of the print head 30 is formed by three resin molded parts. The integrally molded product 18 is formed by joining a first molded product 19, a second molded product 20, and a third molded product 21 with molten resin. The third molded product 21 has a complex shape on its side surface, and when molding, a slide mechanism (slide part) in which a piece is provided slidably in the cavity of the mold is required.

[0015] FIGS. 4(a) to (c) are diagrams showing the manufacturing process of the integrally molded product 18 composed of three parts in the present embodiment. In the first step shown in FIG. 4(a), the first mold 02 and the second mold 03 are closed, and the first molded product 19, the second molded product 20, and the third molded product 21 are molded at three different positions. After molding the first molded product 19, the second molded product 20, and the third molded product 21, the first mold 02 and the second mold 03 are opened. Note that this is only an example, and the first molded product 19, the second molded product 20, and the third molded product 21 may be molded at any timing as long as they are before being joined together.

[0016] In the state of mold opening from the first step, the first molded product 19 is held by the first mold 02, the second molded product 20 is held by the second mold 03, and the third molded product 21 is held by the second mold 03. In that state, the second mold 03 is moved in the mold surface direction (Z direction) with respect to the first mold 02 so that the first molded product 19 and the second molded product 20 face each other. Thereafter, in the second step shown in FIG. 4(b), the first mold 02 and the second mold 03 are closed, and molten resin is poured into a space part (not shown) formed by combining the first molded product 19 and the second molded product 20. As a result, the first molded product 19 and the second molded product 20 are joined, and the first intermediate molded product 32 is molded. After molding the first intermediate molded product 32, the first mold 02 and the second mold 03 are opened.

[0017] In the state of mold opening from the second process, the first intermediate molded product 32 is held by the first mold 02, and the third molded product 21 is held by the second mold 03. Then, as shown in the upper figure of Fig. 4(c), the second mold 03 is moved in the Z direction with respect to the first mold 02 so that the first intermediate molded product 32 held by the first mold 02 and the third molded product 21 held by the second mold 03 face each other. Further, in the third process shown in the lower figure of Fig. 4(c), the first mold 02 and the second mold 03 are closed, and molten resin is poured into the space portion (not shown) formed by combining the first intermediate molded product 32 and the third molded product 21. Thereby, the first intermediate molded product 32 and the third molded product 21 are joined, and the integrally molded product 18 is molded. After the integrally molded product 18 is molded, the first mold 02 and the second mold 03 are opened. At this time, the integrally molded product 18 is held on the side of the second mold 03. Then, the integrally molded product 18 is taken out of the mold.

[0018] Incidentally, the third molded product 21 may be molded in the second process. Regarding the molding timing of the molded product, there are pros and cons. The longer the time from molding to integral molding, the better it can be cooled, so the molded product is less likely to deform when the molten resin is poured. Therefore, it is easy to prevent leakage to unintended parts. However, if the time from molding to integral molding is long, the adhesion between the molded product and the molten resin may decrease. Therefore, it is desirable to determine the molding timing of the molded product according to the material combination, molding conditions, etc.

[0019] Also, the means for moving the molded products to the opposing positions is not limited. In Fig. 4, the second mold 03 is moved laterally to make them face each other, but the mold may be rotated and moved to face each other, or the molded product may be gripped by a robot arm or the like and moved to the opposing position. As explained above, in the manufacturing process of molded products using the injection molding machine 100, it is required that each molded product be held in the desired mold when the mold is opened. However, in the mold opening process, if the shape of the molded parts is complex or the size is large, unnecessary force may be applied to the molded product, causing it to become "trapped," and there is a concern that the molded product will not be held in the desired mold in the correct position. Therefore, this embodiment provides a method for ensuring that each part is held in the correct position and in the correct position during the mold opening process.

[0020] Figure 5 shows the molding process for a molded product that can be used in this embodiment. In the figure, the Y direction indicates the direction of closing or opening the mold between the first mold 02 and the second mold 03, and the Z direction indicates the direction in which the second mold 03 can move parallel to the mold surface of the first mold 02. The method shown in Figure 5 can be used in the first step of Figure 4, specifically in the part where the second molded product 20 and the third molded product 21 are formed. That is, the molded product 15 described below can be considered as either the second molded product 20 or the third molded product 21. In this embodiment, the first mold 02, which is a fixed mold, is equipped with an ejection mechanism 50 for removing the molded product 15 after molding. The ejection mechanism 50 operates during the mold opening operation and ejects the molded product 15 toward the second mold 03. By leaving the molded product 15 in the second mold 03, which is a movable mold, the ejection mechanism 50 can prevent damage to the molded product 15 without disrupting its posture. The timing of the ejection by the ejection mechanism 50 can be anytime during the mold opening operation (while the mold is moving). The mold opening operation and the ejection operation of the molded product 15 by the ejection mechanism 50 may start simultaneously, or the ejection operation may start after the mold opening operation has started. Figure 5 shows an example in which the molded product 15 is ejected by the ejection mechanism 50 simultaneously with the mold opening.

[0021] The ejection mechanism 50 comprises a pressurizing mechanism 36 having a pressurizing section 10, and an ejection section 11 provided with a return pin 09 and an ejector pin 08. The ejection section 11 is connected to a piston 34 of the pressurizing mechanism 36 by a connect rod 35.

[0022] By introducing fluid into the pressurized section 10 via the inlet 12 and discharging the fluid from the vent 13, the piston 34 can be moved in the -Y direction, thereby moving the protruding section 11 in the -Y direction. Alternatively, by discharging fluid from the pressurized section 10 via the inlet 12 and introducing fluid from the vent 13, the piston 34 can be moved in the +Y direction, thereby moving the protruding section 11 in the +Y direction.

[0023] Methods for moving the ejector section 11 could include using a spring, actuator, etc. However, if a spring is used, the operation would be limited to ejecting the molded product in conjunction with the mold opening. When multiple molded products are combined in the mold, such as in-mold molding assembly, some molded products should be ejected when the mold opens, while others should not, in order to face each other. Therefore, if a spring is used to eject the molded product every time the mold opens, it becomes difficult to face each other during in-mold molding assembly. Furthermore, if an actuator is used, it would increase the size of the mold itself, which in turn increases the size and cost of the molding machine, making it unsuitable as a solution. In this embodiment, the fluid used is air, and air is introduced into the pressurizing section 10 at an arbitrary timing during mold opening to eject the molded product 15.

[0024] The molding process in this embodiment will be described below in order of steps.

[0025] As shown in Figure 5(a), the first mold 02 and the second mold 03 are closed to create a space 01 by the cavity inside the mold. At this time, no air flows into the pressurizing section 10, so the pressurizing mechanism 36 does not move. Subsequently, as shown in Figure 5(b), molten resin is injected into the space 01 from an injection unit (not shown) to form a molded product 15. At this time, air flows into the pressurizing section 10 through the inlet 12. This causes the connect rod 35 to move and press the ejector section 11 in the -Y direction. However, since the tip of the return pin 09 provided on the ejector section 11 is in contact with the closed second mold 03, the ejector section 11 does not eject the molded product 15 in the -Y direction.

[0026] When the second mold 03 is moved and the mold opening begins, as shown in Figure 5(c), the protruding part 11 and ejector pin 08, which are held under pressure, are pushed out in the -Y direction in conjunction with the mold opening operation, pushing out the molded product 15. At this time, the return pin 09 is in contact with the second mold 03, so that the molded product 15 can be ejected at the same speed as the mold opening speed. This allows the mold opening to proceed while the molded product 15 remains in the second mold 03, preventing the molded product 15 from being "taken" by the first mold 02. After that, as shown in Figure 5(d), the mold opening is completed with the molded product 15 still held in the second mold 03, and the molded product 15 is removed from the mold by a removal robot or the like.

[0027] Next, as shown in Figure 5(e), the second mold 03 is moved to close the mold. As the mold closes, the return pin 09 is pushed by the second mold 03, causing the protruding portion 11 to move in the +Y direction. Along with this movement, the air in the pressurized section 10 flows out through the inlet 12. After that, as shown in Figure 5(f), the closing of the second mold 03 is completed, and the retraction of the protruding portion 11 via the return pin 09 is also completed.

[0028] The above example shows the ejection of the molded product 15 by the ejection mechanism 50 simultaneously with the opening of the mold. However, it is also possible to operate without ejection occurring simultaneously with the opening of the mold. For example, in the timing before the mold opens shown in Figure 5(b), air may not be introduced from the inlet 12, and air may be introduced from the inlet 12 after the mold opening has started, as shown in Figure 5(c). This results in the ejection by the ejection mechanism 50 occurring later than the start of the mold opening. In other words, when the mold opening starts, the end of the return pin is separated from the second mold 03 that moves with the mold opening.

[0029] In Figure 5(c), the mold is adjusted so that the molded product 15 remains in the second mold 03 without ejection, thereby retaining the molded product 15 in the second mold 03. However, in Figure 5(c), the molded product 15 attempts to leave the fixed first mold 02, but may be caught by the first mold 02 while it is in the process of leaving. In this case, ejection is performed by the ejection mechanism 50 at the moment the molded product 15 is in the process of leaving. Ejection by the ejection mechanism 50 eliminates the first mold 02 from holding onto the molded product, and as the second mold 03 moves, the molded product 15 leaves the first mold 02 and is retained in the second mold 03. This helps to suppress damage to the molded product 15.

[0030] Furthermore, as in the conventional method, the mold can be opened while leaving the product in the first mold 02, and then the molded product 15 can be ejected and removed by controlling the ejection timing of the ejection mechanism 50.

[0031] In this way, by changing the timing of air flowing into the pressurizing section 10 through the inlet 12, the ejection timing of the ejection mechanism 50 can be controlled, making it possible to remove the molded product without damage.

[0032] The molding method described above is achieved by the control unit of the molding apparatus controlling the first mold, the second mold, and the ejection mechanism.

[0033] (modified version) Figure 6 shows a modified example of this embodiment. In this modified example, in-mold molding assembly is performed, and multiple components, namely the first molded product 16 and the second molded product 17, are joined with molten resin to form an integral molded product 22. Then, in order to leave the integral molded product 22 in the second mold 03 after joining, an ejection operation is performed by the ejector part 11 and the ejector pin 08 in conjunction with the mold opening operation. This makes it possible to leave the integral molded product 22 in the second mold 03 without damaging the joint or disrupting its posture. The method shown in Figure 6 can be used in the third step of Figure 4 where the integrally molded product 18 is formed. In other words, the integrally molded product 22 described below can be considered as the integrally molded product 18.

[0034] Figure 6(a) shows the state in which the first molded product 16 held in the first mold 02 and the second molded product 17 held in the second mold 03 are facing each other and the molds are closed. Molten resin is injected from an injection unit (not shown) into the space (not shown) formed by combining the first molded product 16 and the second molded product 17. This joins the first molded product 16 and the second molded product 17 to form an integral molded product 22. At this time, air is introduced into the pressurizing section 10 through the inlet 12 to pressurize the ejector section 11 in the -Y direction. Pressurizing the ejector section 11 applies a force in the direction that pushes the ejector section 11 out, but since the tip of the return pin 09 is in contact with the second mold 03, the ejector section 11 does not eject the molded product 15 while the first mold 02 and the second mold 03 are closed.

[0035] When the mold opening is initiated by moving the second mold 03, as shown in Figure 6(b), the protruding part 11 and ejector pin 08, which are held under pressure, are pushed out in the -Y direction in conjunction with the mold opening operation of the second mold 03, pushing out the integrally molded product 22. At this time, the return pin 09 is in contact with the second mold 03, so that the molded product 15 can be ejected at the same speed as the mold opening speed. This allows the mold to be opened while the integrally molded product 22 is held in the second mold 03. As a result, damage to the joint of the integrally molded product 22 and "getting stuck" can be prevented. After that, as shown in Figure 6(c), the mold opening is completed with the integrally molded product 22 held in the second mold 03, and the integrally molded product 18 is removed from the mold by a removal robot or the like.

[0036] Next, as shown in Figure 6(d), the second mold 03 is moved in the +Y direction to close the mold. As the mold closes, the return pin 09 is pushed by the second mold 03, and the protruding portion 11 moves in the +Y direction. Along with this movement, the air in the pressurized section 10 flows out through the inlet 12. After that, as shown in Figure 6(e), the closing of the second mold 03 is completed, and the retraction of the protruding portion 11 via the return pin 09 is also completed.

[0037] In this way, by providing the ejection mechanism 50 to the fixed mold, the first mold 02, the molded product can be stably held in the movable mold, the second mold 03, when the mold opens. As a result, damage to the molded product can be suppressed.

[0038] (Second embodiment) A second embodiment of the present invention will be described below with reference to the drawings. Since the basic configuration of this embodiment is the same as that of the first embodiment, only the characteristic configurations will be described below.

[0039] Figure 7 shows the molding process for the molded product in this embodiment. The method shown in Figure 7 can be used in the first step of Figure 4, specifically in the part where the first molded product 19 is formed. That is, the molded product 15 described below can be considered as the first molded product 19. In this embodiment, the second mold 03, which is a movable mold, is equipped with an ejection mechanism 50 for removing the molded product 15 after molding. The configuration of the ejection mechanism 50 is the same as in the first embodiment. In this embodiment, in order to leave the molded product 15 in the first mold 02, which is a fixed mold, the ejection mechanism 50 ejects the molded product 15 during the mold opening operation. By leaving the molded product 15 in the first mold 02, which is a fixed mold, damage to the molded product 15 can be suppressed without disrupting its posture. The timing of the ejection by the ejection mechanism 50 can be anytime during the mold opening operation (while the mold is moving). The mold opening operation and the ejection operation of the molded product 15 by the ejection mechanism 50 may be started simultaneously, or the ejection operation may be started after the mold opening operation has started. Figure 7 shows an example in which the molded product 15 is ejected by the ejection mechanism 50 at the same time as the mold opening.

[0040] The molding process in this embodiment will be described below in order of steps.

[0041] As shown in Figure 7(a), the first mold 02 and the second mold 03 are closed to create a space 01. At this time, no air flows into the pressurizing section 10, so the pressurizing mechanism 36 does not move. Subsequently, as shown in Figure 7(b), molten resin is injected into the space 01 from an injection unit (not shown) to form a molded product 15. At this time, air flows into the pressurizing section 10 through the inlet 12. As a result, the connect rod 35 moves and presses the ejector portion 11 in the +Y direction. However, since the tip of the return pin 09 provided on the ejector portion 11 is in contact with the closed first mold 02, the ejector portion 11 does not eject the molded product 15 in the +Y direction.

[0042] When the mold opening is initiated by moving the second mold 03 in the -Y direction, as shown in Figure 7(c), the protruding part 11 and ejector pin 08, which are held under pressure, are pushed out in the +Y direction in conjunction with the opening operation of the second mold 03, pushing out the molded product 15. At this time, the return pin 09 is in contact with the first mold 02, so that the molded product 15 can be ejected at the same speed as the mold opening speed. In other words, the return pin 09 is in contact with the first mold 02 when the movement of the second mold 03 begins. This allows the mold to open while the molded product 15 is held in the first mold 02, preventing the molded product 15 from being "taken" by the second mold 03. After that, as shown in Figure 7(d), the opening of the second mold 03 is completed with the first mold 02 holding the molded product 15, and the molded product 15 is removed from the mold by a removal robot or the like.

[0043] Next, as shown in Figure 7(e), the second mold 03 is moved in the +Y direction to begin mold closing. At this time, the end of the return pin 09 comes into contact with the first mold 02, causing the protruding portion 11 and the ejector pin 08 to be pressed in the -Y direction and retract in the -Y direction within the second mold 03. After that, as shown in Figure 7(f), the first mold 02 and the second mold 03 come into contact, completing the mold closing.

[0044] (modified version) Figure 8 shows a modified example of this embodiment. In this modified example, in-mold molding assembly is performed, and the first molded product 16 and the second molded product 17 are joined with molten resin to form an integral molded product 22. After joining, in order to leave the integral molded product 22 in the first mold 02, an ejection operation is performed by the ejector part 11 and the ejector pin 08 in conjunction with the mold opening operation. This makes it possible to leave the integral molded product 18 in the first mold 02 without damaging the joint or disrupting its posture. The method shown in Figure 8 can be used in the second step of Figure 4, specifically in the part where the first intermediate molded product 32 is formed. That is, the integral molded product 22 described below can be considered as the first intermediate molded product 32.

[0045] Figure 8(a) shows the state in which the first molded product 16 held in the first mold 02 and the second molded product 17 held in the second mold 03 are facing each other and the molds are closed. Molten resin is injected from an injection unit (not shown) into the space (not shown) formed by combining the first molded product 16 and the second molded product 17. This joins the first molded product 16 and the second molded product 17 to form an integral molded product 22. At this time, air flows into the pressurizing section 10 through the inlet 12, and the ejector section 11 is pressed in the +Y direction. When the ejector section 11 is pressed, a force is applied in the direction that pushes the ejector section 11 out, but because the tip of the return pin 09 is in contact with the second mold 03, the ejector section 11 does not eject the molded product 15 while the first mold 02 and the second mold 03 are closed.

[0046] When the second mold 03 starts to open, as shown in Figure 8(b), the protruding part 11 and ejector pin 08, which are held under pressure, are pushed out in the +Y direction in conjunction with the opening operation of the second mold 03, pushing out the integrally molded product 22. At this time, the return pin 09 is in contact with the first mold 02, so that the molded product 15 can be ejected at the same speed as the mold opening speed. This allows the mold to open while the integrally molded product 22 is held in the first mold 02. As a result, damage to the joint of the integrally molded product 22 and "getting stuck" can be prevented. After that, as shown in Figure 8(c), the opening of the second mold 03 is completed with the integrally molded product 22 still held in the first mold 02, and the integrally molded product 22 is removed from the mold by a removal robot or the like.

[0047] Next, as shown in Figure 8(d), the second mold 03 is moved to close the mold. As the mold closes, the return pin 09 contacts and pushes against the first mold 02, causing the protruding portion 11 to move in the -Y direction. Along with this movement, the air in the pressurized section 10 flows out through the inlet 12. After that, as shown in Figure 8(e), the closing of the second mold 03 is completed, and the retraction of the protruding portion 11 via the return pin 09 is also completed.

[0048] In this way, the ejection mechanism performs an ejection operation while the mold opening operation is taking place. Furthermore, the ejection mechanism 50 only needs to be provided in either the first mold 02 or the second mold 03, and the ejection by the ejection mechanism 50 holds the molded product in the other mold. This helps to suppress damage to the molded product. In the above explanation, the manufacturing process of the integrally molded product 18 for the print head 30, as described in Figure 4, was used as an example, but the present invention is not limited to the above configuration. In resin molding, it is also acceptable to simply mold a single molded product. In any case, the present invention will function effectively as long as the configuration includes a step of injecting molten resin into two closed molds to mold a part, and a step of opening these two molds.

[0049] This embodiment includes the following methods and configurations.

[0050] (Method 1) A mold closing process in which the first mold and the second mold are closed to form a space inside the closed mold, An injection process in which molten resin is injected into the aforementioned space to form a molded product, A mold opening step in which the first mold and the second mold are opened, An ejection step in which the molded product is ejected toward the other mold by an ejection mechanism provided in either the first mold or the second mold, thereby holding the molded product in the other mold, It has, A method for manufacturing a molded product, characterized in that the ejection step is performed while the mold opening step is being carried out.

[0051] (Method 2) The method for manufacturing a molded product according to Method 1, wherein in the ejection step, a fluid is introduced into the pressurized portion of the ejection mechanism, causing the ejection portion of the ejection mechanism to move and eject the molded product.

[0052] (Method 3) The method for manufacturing a molded article according to Method 2, wherein the ejection step is started simultaneously with the start of the mold opening step.

[0053] (Method 4) The method for manufacturing a molded product according to method 3, wherein in the ejection step, the molded product is ejected by the force held by the pressurizing section.

[0054] (Method 5) A method for manufacturing a molded article according to any one of methods 2 to 4, wherein the fluid is air.

[0055] (Method 6) A method for manufacturing a molded article according to any one of methods 2 to 5, wherein the molded article is ejected by an ejector pin having the ejector portion in the ejection step.

[0056] (Method 7) A method for manufacturing a molded article according to method 3 or 4, wherein when the mold opening process begins, the end of the return pin of the protruding portion is in contact with the other mold which is separated.

[0057] (Method 8) The method for manufacturing a molded product according to Method 2, wherein when the mold opening process begins, the end of the return pin of the protruding portion is separated from the other mold that is separated.

[0058] (Method 9) The mold closing step and the mold opening step are performed by the second mold moving relative to the first mold. The ejection mechanism is provided in the first mold, and the method for manufacturing a molded article is as described in any one of methods 1 to 8.

[0059] (Method 10) The mold closing step and the mold opening step are performed by the second mold moving relative to the first mold. The ejection mechanism is provided in the second mold, and the method for manufacturing a molded article is as described in any one of methods 1 to 8.

[0060] (Method 11) A method for manufacturing a molded article according to any one of methods 1 to 10, wherein the injection step involves joining a first member held by the first mold and a second member held by the second mold using injected molten resin.

[0061] (Composition 1) First mold and Second mold and An ejection mechanism provided in either the first mold or the second mold for ejecting the molded product formed by the first mold and the second mold, A control unit that controls the opening operation of the first mold and the second mold, the closing operation of the first mold and the second mold, and the ejection operation of the ejection mechanism, A molding apparatus equipped with, The manufacturing apparatus is characterized in that the control unit performs the ejection operation while the mold opening operation is being performed. [Explanation of Symbols]

[0062] 01 Space section 02 First Mold 03 Second mold 09 Return Pin 10 Pressurized section 11. Protruding part 18 Integrally molded product 50 Protrusion mechanism

Claims

1. A mold closing process in which the first mold and the second mold are closed to form a space inside the closed mold, An injection process in which molten resin is injected into the aforementioned space to form a molded product, A mold opening step in which the first mold and the second mold are opened, An ejection step in which the molded product is ejected toward the other mold by an ejection mechanism provided in either the first mold or the second mold, thereby holding the molded product in the other mold, It has, A method for manufacturing a molded product, characterized in that the ejection step is performed while the mold opening step is being carried out.

2. The method for manufacturing a molded product according to claim 1, wherein in the ejection step, a fluid is introduced into the pressurized portion of the ejection mechanism, causing the ejection portion of the ejection mechanism to move and eject the molded product.

3. The method for manufacturing a molded article according to claim 2, wherein the ejection step is started simultaneously with the start of the mold opening step.

4. The method for manufacturing a molded product according to claim 3, wherein in the ejection step, the molded product is ejected by the force held by the pressurizing section.

5. The method for manufacturing a molded article according to claim 2, wherein the fluid is air.

6. The method for manufacturing a molded article according to claim 2, wherein in the ejection step, the molded article is ejected by an ejector pin having the ejector portion.

7. The method for manufacturing a molded article according to claim 4, wherein when the mold opening process begins, the end of the return pin of the protruding portion is in contact with the other mold which is separated.

8. The method for manufacturing a molded article according to claim 2, wherein when the mold opening process begins, the end of the return pin of the protruding portion is separated from the other mold that is separated.

9. The mold closing step and the mold opening step are performed by the second mold moving relative to the first mold. The method for manufacturing a molded product according to claim 1, wherein the ejection mechanism is provided in the first mold.

10. The mold closing step and the mold opening step are performed by the second mold moving relative to the first mold. The method for manufacturing a molded article according to claim 1, wherein the ejection mechanism is provided in the second mold.

11. The method for manufacturing a molded article according to claim 1, wherein in the injection step, the first member held by the first mold and the second member held by the second mold are joined by the injected molten resin.

12. First mold and Second mold and An ejection mechanism provided in either the first mold or the second mold for ejecting the molded product formed by the first mold and the second mold, A control unit that controls the opening operation of the first mold and the second mold, the closing operation of the first mold and the second mold, and the ejection operation of the ejection mechanism, A molding apparatus equipped with, The manufacturing apparatus is characterized in that the control unit performs the ejection operation while the mold opening operation is being performed.

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