JP2023164010A - Die component, molding die, and method for molding molded article - Google Patents

Abstract

To provide a die component that enables a sprue bushing part to be detached from the die.SOLUTION: A die component is disposed in a molding die 20 including a first die 106 and a second die 118, the molding die used for injecting a molding material into an internal cavity and producing a molded article corresponding to the shape of the cavity. The die component is disposed on a side surface of the molding die orthogonal to a contact surface between the first die and the second die and comprises a first die component 200a attached to the first die and a second die component 200b attached to the second die. The first die component and the second die component are each provided with a through-hole which allows the passage of an attachment member for attaching the first die component and the second die component to the molding die.SELECTED DRAWING: Figure 2

Description

The present invention relates to a mold component, a molding die, and a method for molding a molded article.

There is a plastic model that is generally called "colored plastic" and is molded using a technique in which multiple colored plastics are poured into one runner and several colored plastics are simultaneously molded within a frame using a molding machine called a multicolored molding machine. (See Non-Patent Document 1).

GUNDAM WORLD ENCYCLOPEDIA "Iropla" http://www.gudamer.sakura.ne.jp/wiki/wiki.cgi/GUNDAM?page=%BF%A7%A5%D7%A5%E9

In order to mold ``colored plastic,'' plastic materials of different colors must be injected into a mold. At this time, the sprue bushing portion into which the plastic material is injected may be formed by carving it into the side surface of the mold using a general-purpose milling machine. Such a sprue bushing part may be crushed by the impact when plastic material is injected, and in that case, troubles such as resin leakage occur. In order to re-form the bushing portion, it is necessary to remove the mold from the molding machine and re-carve the crushed sprue bushing portion using a general-purpose milling machine, and the repair work requires a considerable amount of time. A sprue bushing with replaceable parts has also been proposed, but it cannot be used on the dividing surface of a mold.

In contrast, the present invention provides a mold component whose sprue bushing is removable from the mold, and also provides a mold for molding and a method for molding a molded product using the mold component. purpose.

The present invention that solves the above problems is a mold component,
A mold disposed in a molding mold consisting of a first mold and a second mold for injecting a molding material into an internal cavity to produce a molded product corresponding to the shape of the cavity. It is a part,
disposed on a side surface of the molding die perpendicular to the contact surface between the first mold and the second mold,
a first mold component attached to the first mold;
a second mold component attached to the second mold,
A recess is formed in each contact surface that contacts each other when the first mold part and the second mold part are arranged in the molding die, and the recess is a part of the first mold part. forming a first opening for injecting the molding material into the mold when the mold component and the second mold component are placed in the mold;
A through hole is formed in each of the first mold component and the second mold component, through which a mounting member for mounting on the molding die passes.

The present invention provides a sprue bushing part as a mold part that is removable from the mold, and also provides a molding die and a method for molding a molded product using the mold part, thereby improving work efficiency. be able to.

1 is a diagram illustrating a cross section of a molding device according to an embodiment. (A) is a perspective view of the appearance of a molding die 20 according to an embodiment, and (B) is a plan view thereof. (A) and (B) are perspective views showing an example of the appearance of the front and back surfaces of a mold component 200 of a molding die according to an embodiment, and (C) is a contact surface of the mold component 200. (D) is a cross-sectional view showing an example of the cross-sectional structure of the mold component 200 along the BB' plane. (A) is a diagram showing an example of the configuration of the attachment part of the mold component 200 in the molding die 20, and (B) is a diagram showing an example of the configuration of the contact surface of the male die 106 of the molding die 20. . (A) is a cross-sectional view showing an example of the cross-sectional structure in the AA' plane with the mold component 200 attached to the molding die 20, and (B) is a cross-sectional view showing the screw 203 in the cross-sectional view of (A). A diagram showing a removed state, (C) is a diagram showing an example of the structure of the screw 203. The figure which shows an example of the structure of the cavity in the molding die 20.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the claimed invention, and not all combinations of features described in the embodiments are essential to the invention. Two or more features among the plurality of features described in the embodiments may be arbitrarily combined. In addition, the same or similar configurations are given the same reference numerals, and duplicate explanations will be omitted. In addition, in each figure, the up, down, left, right, front and back directions with respect to the paper surface will be used as the up, down, left, right, front and back directions of the component (or parts) in this embodiment in the description in the text. Although the present invention assumes a resin material as the molding material in the embodiments described below, it is not limited to this, and other materials (thermoplastic resins such as polystyrene, polyethylene, ABS, thermosetting resins, metals, etc.) may be used. ) is also applicable.

FIG. 1 shows a sectional view of a molding apparatus 10 according to an embodiment of the invention. As shown in FIG. 1, the molding device 10 of this embodiment includes a movable mold body 102 that is attached to the movable side of a molding material injection device (not shown) that injects molding material, and a movable mold body 102 that is attached to the fixed side of the molding material injection device. It has a fixed mold body 103. Runner grooves into which the molding material flows are formed in the movable mold body 102 and the fixed mold body 103, respectively.

The movable mold main body 102 includes a male mold mounting plate 107 to which the male mold 106 is attached, a fixed base 108 to which the male mold mounting plate 107 is fixed, a movable side mounting plate 109 to be attached to the molding material injection device, and a fixed base 108. A spacer 110 is provided between the moving side mounting plate 109 and the moving side mounting plate 109. The male die 106 and the male die mounting plate 107 may be configured integrally or may be configured independently as separate bodies. A cavity 111 is formed in the fixed base 108, and a movable push-out plate 112 is provided within the cavity 111. The pushing plate 112 is fixed to a pressing shaft 116 provided in openings 114 and 115 formed in the fixed base 108 and the movable mounting plate 109. Further, a knockout pin 113 is formed on the extrusion plate 112 and passes through the male die mounting plate 107 and the male die 106 . Here, by moving the push-out plate 112, the tip of the knockout pin 113 is formed to protrude into the runner groove.

The fixed mold body 103 includes a fixed mounting plate 117 that is attached to the molding material injection device, a female mounting plate 119 that is attached to the female mold 118, and a spacer provided between the fixed mounting plate 117 and the female mounting plate 119. 120. The female mold 118 and the female mold mounting plate 119 may be configured integrally, or may be configured independently as separate bodies. A sprue bush 104 for injecting molten molding material from a molding injection device is attached to the fixed mold body 103. The sprue bush 104 passes through the fixed mounting plate 117 and extends to the female mold 118, and a sprue 105 is formed therein to serve as a supply channel for molten resin. The sprue 105 communicates with runner grooves formed in the female mold 118 and the male mold 106, and the molding material flows into the cavities formed in the female mold 118 and the male mold 106 through this runner groove. .

In FIG. 1, only the sprue bush 104 provided on the fixed mold body 103 side is shown for explanation, but in the configuration corresponding to this embodiment, the movable mold body 102 and the fixed mold body 103 are connected. An additional sprue bush corresponding to this embodiment is provided on the contact surface.

In the molding apparatus 10 shown in FIG. 1, after forming a molded product by flowing molding material into molding spaces (cavities) for forming runner grooves and each part, a movable mold body 102 is moved from a fixed mold body 103. When the push-out plate 112 is moved by pressing the pressing shaft 116, the knockout pin 113 provided on the push-out plate 112 pushes out the molded product attached to the male mold 106 that constitutes the movable mold body 102, and the molded product is removed. Can be taken out easily. Note that FIG. 1 is a diagram showing the structure of the molding device 10 as an example, and the structure of the molding device 10 is not limited to that shown in FIG. 1, and various changes are possible.

Next, with reference to FIG. 2, an example of the configuration of the male die 106 and the female die 118 corresponding to this embodiment will be described. Here, the explanation will be given assuming that the male mold 106 and the male mounting plate 107, and the female mold 118 and the female mounting plate 119 are each integrally constructed. That is, the molding material injection device can be attached directly to the side surfaces of the male die 106 and the female die 118. In FIG. 2, the male die 106 and the female die 118 are collectively referred to as a molding die 20.

FIG. 2(A) is a perspective view showing an example of the appearance of the molding die 20. FIG. FIG. 2(B) is a plan view of the appearance of the molding die 20 viewed from the female mold 118 side. A sprue bush 104 is formed on the surface of the female mold 118 on the fixed mounting plate 117 side of the molding die 20 . Further, on four side surfaces of the molding die 20, mold parts 200 as replacement parts are arranged, which can function as a sprue bush for injecting molten molding material from a molding injection device. The side surface is perpendicular to the contact surface (the surface opposite to the surface on which the sprue bushing 104 is formed) where the male die 106 and the female die 118 connect to each other.

The mold component 200 includes a mold component 200a fixed to the male mold 106 side and a mold component 200b fixed to the female mold 118 side. Each mold component 200 has an opening 201 formed at the center of a recess 202 formed in the shape of a hemispherical cap so as to be in close contact with the tip of an injection nozzle of a molding agent injection device. The opening 201 is connected to a molding space (cavity) inside the mold, and allows molding material to flow therein to form a molded product. Moreover, the mold component 200 is screwed at four places using screws 203 as attachment members for attaching the mold component 200 to the molding die 20, and is attached to the molding die 20. Fixed.

As shown in FIG. 2(B), the mold component 200 can be placed at any position on the side surface of the molding die 20. Also, it is not necessary to arrange mold parts on either side. The mold component 200 is arranged to protrude from the side surface of the molding die 20 by a predetermined thickness. This is to make it easier to remove the mold component 200 from the mold, and to maintain strength by ensuring the thickness of the mold component 200. For example, half of the thickness of the mold component 200 may protrude beyond the side surface of the molding die 20.

FIG. 3 is a diagram showing the appearance of the mold component 200. The mold part 200 can be manufactured, for example, from carbon steel S50C for machine structures. 3(A) is a perspective view showing an example of the appearance of the front surface of the mold component 200, and FIG. 3(B) is a perspective view showing an example of the appearance of the back surface of the mold component 200. FIG. 3(C) is a diagram showing an example of the structure of the contact surface of the mold component 200a with the mold component 200b, and FIG. 3(D) is a cross section of the mold component 200 taken along the line BB'. It is a perspective view showing an example of a structure. Openings 204a and 204b are formed in the surfaces of the mold parts 200a and 200b, respectively. Furthermore, openings 205a and 205b are formed on the back surfaces of the mold parts 200a and 200b, respectively. As shown in FIG. 3(D), the opening 205a is connected to the opening 204a, the opening 205b is connected to the opening 204b, and passes through the inside of the mold component 200. The diameter of the opening 205 is smaller than the diameter of the opening 204. Note that although the opening 204 is not threaded, the opening 205 is threaded. However, the thread formed in the opening 205 does not fit into the screw 203 and does not function to fix the screw 203. Instead, the threads in opening 205 can be utilized for removal if mold part 200 is damaged.

Further, when the mold component 200a is placed in the molding die together with the mold component 200b, a recess 201a shown in FIG. 3(C) is formed on the contact surface 206a that contacts the mold component 200b. . The recess 201a forms the opening 201 by combining the mold component 200a and the mold component 200b (bringing them into contact at the contact surface 206) together with the recess 201b formed in the contact surface 206b (not shown) of the mold component 200b. . The opening 201 is formed to penetrate the mold component 200. At this time, the mold parts 200a and 200b have a plane-symmetric configuration with respect to the contact surface 206.

The mold parts 200a and 200b can each have a length L of about 50 mm, a width W of 15 mm, and a thickness D of 10 mm, for example. Note that the size of the mold component 200 is not limited to this value, and may be any size. Each of the mold parts 200a and 200b has rounded corners. This is to ensure a gap between the mold component 200 and the recess on the molding die 20 side to which the mold component 200 is mounted, and to allow a tool or the like to be inserted when the mold component 200 is removed.

Next, with reference to FIG. 4, the configuration of the molding die 20 side that accommodates the die component 200 will be described. FIG. 4(A) is a perspective view showing a schematic structure of the mold component 200 and the surrounding area of the molding mold 20. As shown in FIG. Moreover, FIG. 4(B) is a diagram showing an example of the structure of the contact surface of the male mold 106 with the female mold 118.

A recess 400 for accommodating the mold component 200 is formed in the molding die 20 . The recess 400 consists of a recess 400a on the male mold 106 side and a recess 400b on the female mold 118 side. The recess 400 has an opening 401 that is continuous with (connects with) the opening 201 of the mold component 200, and an opening 402 that is formed with a screw thread that fits with the screw 203 for fixing the mold component 200. are arranged in each of the male mold 106 and the female mold 118.

Further, as shown in FIG. 4(B), a recess 401a is formed in a contact surface 403a where the male mold 106 contacts the female mold 118. The recess 401a forms the opening 401 by combining the male mold 106 and the female mold 118 (bringing them into contact at the contact surface 403) together with a recess 401b formed in a contact surface 403b (not shown) of the female mold 118. The opening 401 is connected to a molding space (cavity) formed inside the molding die 20.

Next, with reference to FIG. 5, a method for fixing the mold component 200 to the molding die 20 will be described. FIG. 5A is a cross-sectional view showing an example of a cross-sectional structure taken along the line AA' in FIG. 2. FIG. Note that FIG. 5A shows an enlarged view of the screw 203 and its vicinity. FIG. 5(B) shows a state in which the screw 203 is removed in the cross-sectional view of FIG. 5(A). FIG. 5C shows an example of the structure of the screw 203. As shown in FIG. 5(C), the screw 203 includes a head 203h and a threaded portion 203s. The threaded portion 203s has a first portion (n1) in which no thread is formed and a second portion (n2) in which a thread is formed. The screw 203 has a so-called "half screw" structure. Among these, the length of the first portion n1 corresponds to the depth of the opening 205a, and the length of the second portion n2 corresponds to the depth of the opening 402.

The opening 402 has a thread (female thread) that corresponds to the thread (male thread) formed on the second portion n2 of the screw 203, and the thread (female thread) of the opening 402 and the thread The screw 203 can be fixed to the molding die 20 by fitting the screw thread (male screw) in the second portion n2 of the screw 203. At this time, the head 203h of the screw 203 presses the bottom of the opening 204 (corresponding to the difference in diameter between the opening 204 and the opening 205) downward, so that the screw 203 moves the mold component 200 into the mold 20. can be fixed to.

In this embodiment, for example, the thread (male thread) of the second portion n2 of the screw 203 and the thread (female thread) of the opening 402 may be a metric thread according to JIS B0205:2001, or a metric thread according to ISO 724:1993 ( It can be an M5 screw defined by ISO general-purpose metric screw threads (Basic dimensions). Furthermore, the thread (female thread) formed in the opening 205 can be, for example, an M6 thread. However, the above M5 and M6 screw threads are shown as examples only, and are not limited to these as long as the diameter of the female thread of the opening 205 is larger than the diameter of the female thread of the opening 402. .

In this manner, in this embodiment, the screw 203 does not fit into the openings 204 and 205 formed in the mold component 200, but only into the opening 402 formed on the mold side. The thread on the opening 205 side can be used to remove the mold component 200 when the mold component 200 is damaged. For example, even if the mold component 200 is stuck to the recess 400 of the molding die 20 and cannot be easily removed even though the screw 203 is removed, the thread of the opening 205 (for example, M6) Insert the screw corresponding to The mold part 200 can be lifted up (jacked up). In this embodiment, an example has been described in which a screw thread for auxiliary work (jacking) is provided on the opening 205 side, but the present invention is not limited to this, and there may be a case where a thread is not provided on the opening 205 side. Also good.

Further, as shown in FIG. 5A, when the mold component 200 is placed in the molding die 20, the contact surface 206 of the mold component 200 and the contact surface 403 of the male mold 106 and the female mold 118 is continuous.

Next, an example of the structure of the mold in the molding die 20 corresponding to this embodiment will be described with reference to FIG. 6. FIG. 6 shows a configuration in which molding is performed by injecting molding materials of different colors from the center and each of the four sides of the molding die 20.

The molding die 60 has a plurality of molding injection ports 600A to 600E, the molding injection port 600A corresponds to the sprue bushing 104, and the molding injection ports 600B to E correspond to the mold parts 200 in FIG. Each corresponds to a sprue bush. The molding die 60 is a mold having a plurality of molding spaces (cavities) 602 as part molding parts for forming a plurality of parts, and each cavity 602 is connected to a main runner groove 603 via a sub-runner groove 604. is connected to. When molten molding material is injected from the molding material injection port 600A or the like, the molding material flows from the main runner groove 603 to the cavity 602 via the sub-runner groove 604. After all cavities 602 are filled with the molding material, a molded article can be produced by cooling.

Here, each cavity 602 is associated with one of the molding injection ports 600, for example, the cavity 602 surrounded by a dotted line 601A is associated with the molding injection port 600A. Similarly, the cavity 602 surrounded by the dotted line 601B is the molding injection port 600B, the cavity 602 surrounded by the dotted line 601C is the molding injection port 600C, and the cavity 602 surrounded by the dotted line 601D is the molding injection port 600D, and the cavity 602 surrounded by the dotted line 601D is the molding injection port 600D, Cavities 602 surrounded by 601E are respectively associated with mold injection ports 600E.

Although not shown in FIG. 6, switches are arranged in the main runner groove 603 and the sub-runner groove 604 to dam the flow of the molding material so that the molding material does not flow into other cavities. Thereby, the molding material flowing from the molding injection port 600 can fill only the cavity 602 associated with the molding injection port 600.

In the molding method using the molding die 60 corresponding to this embodiment, the molding material is injected from the opening 105 of the sprue bushing 104 on the main nozzle side of the injection molding machine, and a plurality of parts are connected to the runner. A first molding step of molding a molded product consisting of a plurality of parts connected to a runner by injecting molding material from the opening 201 of the mold part 200 on the sub-nozzle side of the injection molding machine. and a second molding step of molding a molded article.

According to the molding die corresponding to the above embodiment, the sprue bushing, which has been directly carved into the die, can be replaced as the die component 200. As a result, even in the event of a problem during mass production molding, the only work required to deal with it is to replace the mold part 200, thereby avoiding the work of getting on and off the mold or making corrections, thereby significantly improving work efficiency. Specifically, even if multiple mold parts 200 are replaced, it takes less than 10 minutes, compared to the time required (2 to 3 hours) when sprue bushings are carved directly into the mold. This can save you a lot of time.

<Summary of embodiments>
The above embodiments at least disclose the following mold components, molding molds, and methods for molding a molded article.

(1) Placed in a molding die consisting of a first mold and a second mold for injecting a molding material into an internal cavity to produce a molded article corresponding to the shape of the cavity. A mold part,
disposed on a side surface of the molding die perpendicular to the contact surface between the first mold and the second mold,
a first mold component attached to the first mold;
a second mold component attached to the second mold,
A recess is formed in each contact surface that contacts each other when the first mold part and the second mold part are arranged in the molding die, and the recess is a part of the first mold part. forming a first opening for injecting the molding material into the mold when the mold component and the second mold component are placed in the mold;
A mold component, wherein each of the first mold component and the second mold component is formed with a through hole through which a mounting member for mounting on the molding die passes.

(2) A second screw thread different from a first screw thread formed on the mounting member is formed in the through hole, and the through hole is configured not to fit with the mounting member. The mold part described in (1).

(3) The first mold component and the second mold component are mutually exclusive when the first mold component and the second mold component are placed in the molding die. The mold component according to (1) or (2), which has a planar symmetrical configuration with respect to the contact surface.

(4) The first mold component and the second mold component are, when the first mold component and the second mold component are placed in the molding die,
a first contact surface of the first mold component and a second contact surface of the second mold component,
The first contact surface is continuous with a surface where the first mold contacts the second mold,
The mold component according to any one of (1) to (3), wherein the second contact surface is continuous with a surface where the second mold contacts the first mold.

(5) The first mold component is configured to be able to be placed in a first recess formed in the first mold,
The second mold component is configured to be able to be placed in a second recess formed in the second mold,
When the first mold component and the second mold component are arranged in the first recess and the second recess, respectively, the first mold component and the second mold component At least a portion of the mold component protrudes from a surface of the first mold in which the first recess is formed and a surface of the second mold in which the second recess is formed. The mold part according to any one of (1) to (4).

(6) The mounting member is configured as a half screw,
The mold component according to any one of (1) to (5), which fits only with the mold when the mold component is coupled to the mold.

(7) The mold component according to any one of (1) to (6), wherein an inner diameter of the through hole is larger than an inner diameter of a coupling hole of the molding die that is coupled to the mounting member.

(8) A molding mold comprising the mold component according to any one of (1) to (7),
comprising a first mold and a second mold,
A second opening for injecting the molding material into the molding mold is provided on a surface of the first mold parallel to a contact surface between the first mold and the second mold. , mold for molding.

(9) the first mold has a first recess that at least partially accommodates the first mold component;
the second mold has a second recess that at least partially accommodates the second mold component;
The first recess has a first screw hole for fixing the first mold component while being at least partially accommodated in the first recess, and the first screw hole has a , a third thread is formed to correspond to the first thread formed on the mounting member and to fit with the mounting member;
The second recess has a second screw hole for fixing the second mold component while being at least partially accommodated in the second recess, and the second screw hole has a second screw hole. , The molding die according to (8), wherein the third screw thread is formed to correspond to the first screw thread and fit with the mounting member.

(10) A recess is formed in each contact surface where the first mold and the second mold contact each other, and the recess is a contact surface between the first mold and the second mold. is connected and when the mold part is placed, the third opening is continuous with the first opening and is for injecting the molding material into the cavity in the molding mold. The molding die according to (9).

(11) Molding material is injected into the mold according to any one of (8) to (10) through the second opening, and a plurality of parts are connected to a runner to form a mold. a first molding step of molding the object;
a second molding step of injecting a molding material into the molding die from the first opening to mold a molded product in which a plurality of parts are connected to a runner;
A method of forming a molded article, including:

The invention is not limited to the above-described embodiments, and various modifications and changes can be made within the scope of the invention.

Claims (11)

A mold disposed in a molding mold consisting of a first mold and a second mold for injecting a molding material into an internal cavity to produce a molded product corresponding to the shape of the cavity. It is a part,
disposed on a side surface of the molding die perpendicular to the contact surface between the first mold and the second mold,
a first mold component attached to the first mold;
a second mold component attached to the second mold,
A recess is formed in each contact surface that contacts each other when the first mold part and the second mold part are arranged in the molding die, and the recess is a part of the first mold part. forming a first opening for injecting the molding material into the mold when the mold component and the second mold component are placed in the mold;
A mold component, wherein each of the first mold component and the second mold component is formed with a through hole through which a mounting member for mounting on the molding die passes. A second screw thread different from a first screw thread formed on the mounting member is formed in the through hole, and the through hole is configured not to fit with the mounting member. The mold part described in item 1. The first mold component and the second mold component are in contact with each other when the first mold component and the second mold component are placed in the molding die. The mold component according to claim 1, having a plane-symmetric configuration with respect to a plane. The first mold component and the second mold component are, when the first mold component and the second mold component are placed in the molding die,
a first contact surface of the first mold component and a second contact surface of the second mold component,
The first contact surface is continuous with a surface where the first mold contacts the second mold,
The mold component according to claim 1, wherein the second contact surface is continuous with a surface where the second mold contacts the first mold. The first mold component is configured to be able to be placed in a first recess formed in the first mold,
The second mold component is configured to be able to be placed in a second recess formed in the second mold,
When the first mold component and the second mold component are arranged in the first recess and the second recess, respectively, the first mold component and the second mold component At least a portion of the mold component protrudes from a surface of the first mold in which the first recess is formed and a surface of the second mold in which the second recess is formed. The mold component according to claim 1. the mounting member is configured as a half-thread;
The mold component according to claim 1, wherein when the mold component is coupled to the mold, the mold component fits only with the mold. The mold component according to claim 1, wherein the inner diameter of the through hole is larger than the inner diameter of a coupling hole of the mold for coupling with the mounting member. A molding die comprising the mold component according to any one of claims 1 to 7,
comprising a first mold and a second mold,
A second opening for injecting the molding material into the molding mold is provided on a surface of the first mold parallel to a contact surface between the first mold and the second mold. , mold for molding. the first mold has a first recess that at least partially accommodates the first mold component;
the second mold has a second recess that at least partially accommodates the second mold component;
The first recess has a first screw hole for fixing the first mold component while being at least partially accommodated in the first recess, and the first screw hole has a , a third thread is formed to correspond to the first thread formed on the mounting member and to fit with the mounting member;
The second recess has a second screw hole for fixing the second mold component while being at least partially accommodated in the second recess, and the second screw hole has a second screw hole. 9. The molding die according to claim 8, wherein the third screw thread is formed to correspond to the first screw thread and fit with the mounting member. A recess is formed in each contact surface where the first mold and the second mold contact each other, and the recess is the contact surface between the first mold and the second mold. , forming a third opening that is continuous with the first opening and for injecting the molding material into the cavity in the molding die when the mold part is placed. The mold for molding described in . A first molding step of injecting a molding material from the second opening into the molding die according to claim 8 to mold a molded product in which a plurality of parts are connected to a runner;
a second molding step of injecting a molding material into the molding die from the first opening to mold a molded product in which a plurality of parts are connected to a runner;
A method of forming a molded article, including:

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