WO2021039261A1

WO2021039261A1 - Molding method and model part

Info

Publication number: WO2021039261A1
Application number: PCT/JP2020/029144
Authority: WO
Inventors: 博文岸山; 敏之脇田; 博貴中野
Original assignee: 株式会社バンダイ
Priority date: 2019-08-29
Filing date: 2020-07-29
Publication date: 2021-03-04
Also published as: JP6744467B1; CN111823511B; CN111823511A; CN114559611A; JP2021030704A

Abstract

[Problem] To provide a molding method in which a switch can easily be made between molding and not molding a part for each part in a molding die, and a model part which is molded by said molding method. [Solution] Provided is a molding method in which a molding is molded by the selective execution of: a first molding step of injecting a molding material into a molding die which is formed with a magnetic material and molding a first molding which is configured of a plurality of parts connected by runners; and a second molding step of injecting the molding material into the molding die and molding a second molding which does not include a portion of the plurality of parts which configure the first molding. The molding die comprises a switch housing part for blocking or allowing the inflow of the molding material into a prescribed portion of the molding die which corresponds to the portion of the plurality of parts by attachment or removal of a magnetic switch.

Description

Molding method and model parts

The present invention relates to a molding method and a model part.

Generally, a molded product such as a plastic model molded using a resin is configured by connecting a plurality of parts to be assembled to a runner (see Patent Document 1). It is common to provide different combinations of parts depending on the type and shape of the finished product that is completed by assembling the parts, but although some are different as finished products, the parts are common only with some differences. There are also variation products that have parts.

Japanese Unexamined Patent Publication No. 2006-142578

When molding parts for the above-mentioned variation products, it is also possible to make a dedicated molding mold (mold) for each product. It is also possible to use the mold of the original product as it is and mold it including parts that are not used in the variation product. The former is inefficient because it incurs the cost of making additional moldings only for some unnecessary parts, and the latter is inefficient because parts that are not used in variation products are molded and molded materials. Waste occurs.

Therefore, there is a demand for a technique that enables molding of only the necessary common parts by making it possible to easily switch whether or not to mold each part in the molding die.

The present invention provides a molding method that enables easy switching between molding and non-molding for each part in a molding mold, and a model part molded by the molding method.

The present invention is a molding method, in which a molding material is injected into a molding mold made of a magnetic material to form a first molded product in which a plurality of parts are connected to a runner. Step and the molding material is injected into the molding mold to mold a second molded product which is a second molded product and does not include a part of the plurality of parts constituting the first molded product. A molding method for selectively executing a second molding step and a molded product to mold a molded product, wherein the molding mold is a molding material for a predetermined portion of the molding mold corresponding to a part of the plurality of parts. A switch accommodating portion for blocking or allowing the inflow by attaching / detaching the magnetic switch is provided, and in the first molding step, the inflow of the molding material is permitted because the magnetic switch is not mounted on the switch accommodating portion. The first molded product including a part of the plurality of parts corresponding to the predetermined portion is formed, and in the second molding step, the molding is performed by mounting a magnetic switch on the switch accommodating portion. The inflow of the material is blocked to form the second molded product that does not include a portion of the plurality of parts corresponding to the predetermined portion.

Further, the model part is a model part including at least one molded product connected to the second runner connected to the first runner, and is at least one of the first runner and the second runner. It has a spherical concave surface at its end.

According to the present invention, it is possible to form a model part by easily switching whether or not to form each part in the molding die.

The figure which illustrates the cross section of the molding apparatus which concerns on embodiment of an invention. (A) is a perspective view of a runner groove showing a state in which a magnetic switch is not mounted, (b) is a cross-sectional view in the state of (a), and (c) is a perspective view of a runner groove showing a state in which a magnetic switch is mounted. The figure, (d) is a cross-sectional view in the state of (c). (A) is a molding result when the magnetic switch is not attached, (b) is a molding result when the magnetic switch is attached, and (c) is a molding result of (b). The figure which shows the relationship between a molded product and a magnetic switch in. (A) is a diagram showing an example of a molding die 400 before applying a magnetic switch, (b) is a diagram showing an example of a molding die 400A after applying a magnetic switch, and (c) is a diagram showing an example of a molding die 400A after applying a magnetic switch, and (c) is molded using 400 and 400A. The figure which shows an example of the molded product 410A. (A) is a diagram showing an example of a molding die 400B partially equipped with a magnetic switch, and (b) is a diagram showing an example of a molded product 410B molded using the 400B. (A) is a diagram showing an example of a molding die 400C partially equipped with a magnetic switch, and (b) is a diagram showing an example of a molded product 410C molded using the 400C. (A) is a diagram showing an example of a molding die 400D partially equipped with a magnetic switch, and (b) is a diagram showing an example of a molded product 410D molded using the 400D.

Hereinafter, exemplary embodiments of the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are essential to the invention. Two or more of the plurality of features described in the embodiments may be arbitrarily combined. In addition, the same or similar configuration will be given the same reference number, and duplicate description will be omitted.

In each figure, the vertical and horizontal directions with respect to the paper surface will be used as the vertical and horizontal directions of the device according to the present embodiment in the description in the text. The present invention exemplifies a resin material as a molding material in the embodiments described below, but the present invention is not limited to this, and other materials (thermoplastic resin such as polystyrene, polyethylene, ABS, thermosetting resin, metal, etc.) ) Is also applicable.

FIG. 1 shows a cross-sectional view of a molding apparatus corresponding to the embodiment of the invention. As shown in FIG. 1, the molding apparatus of this embodiment has a moving mold main body 102 attached to the moving side of the injection device for injecting a molding material, and a fixed mold main body 103 attached to the fixed side of the injection device. .. Grooves into which the molding material flows are formed in the moving mold main body 102 and the fixed mold main body 103, respectively.

The moving mold main body 102 includes a male mounting plate 107 for mounting the male mold 106, a fixing base 108 for fixing the male mounting plate 107, a moving side mounting plate 109 attached to the molding material injection device, and a fixing base 108. It has a spacer 110 provided between the moving side mounting plate 109 and the moving side mounting plate 109. A vacant room 111 is formed in the fixed base 108, and a movable extrusion plate 112 is provided in the vacant room 111. The extrusion plate 112 is fixed to a pressing shaft 116 provided in the

openings

114 and 115 formed in the fixing base 108. Further, the extrusion plate 112 is formed with a knockout pin 113 penetrating the male mounting plate 107 and the male 106. Here, by moving the extrusion plate 112, the tip of the knockout pin 113 is formed so as to protrude into the runner groove.

The fixed mold main body 103 is a spacer provided between the fixed mounting plate 117 attached to the molding material injection device, the female mold mounting plate 119 to which the female mold 118 is attached, and the fixed mounting plate 117 and the female mold mounting plate 119. It has 120 and.

Further, the grooves formed in the male mold 106 and the female mold 118 form a space 105 into which the molding material flows. The space 105 includes a molding space (cavity) as a part molding portion for forming a plurality of parts, and a runner groove for supplying a molding material to the cavity. Further, in the runner groove, switch accommodating

portions

105a and 105b to which a magnetic switch 104 for controlling the supply of the molding material to a predetermined cavity can be mounted are formed. The magnetic switch 104 can be configured as a spherical magnet, and the

switch accommodating portions

105a and 105b have a concave surface corresponding to the shape of the magnetic switch 104 for attracting the magnetic switch 104 (in this embodiment, a hemispherical concave surface). Has. A neodymium (neodymium) magnet can be used as the spherical magnet. The male type 106 and the female type 118 are formed of a magnetic material (for example, iron), and the magnetic switch 104 can be easily attracted to the

switch accommodating portions

105a and 105b. In the present embodiment, the case where both the male type 106 and the female type 118 are made of a magnetic material will be described, but only one of them may be made of a magnetic material. The attracted magnetic switch 104 can be removed by using, for example, a neodymium magnet or the like. In this embodiment, an example in which a spherical magnet is used as the magnetic switch 104 will be described, but the presence or absence of supply of the molding material to the cavity can be switched by utilizing the magnetic attraction force to the male type 106 or the female type 118. If it is possible, it is not limited to this. For example, a cylindrical magnet may be used as the magnetic switch 104. In that case, it is preferable to form a semi-cylindrical concave surface on the

switch accommodating portions

105a and 105b in order to attract the magnetic switch 104.

Further, in the present embodiment, the runner groove may be a plurality of types of runner grooves having different widths, and a switch accommodating portion may be provided for each. Alternatively, the switch accommodating portion may be provided only in a part of the plurality of types of runner grooves. In this embodiment, two types of runner grooves having different widths will be described. Specifically, there are a main runner groove having a first width (LW1) and a sub runner groove having a second width (LW2). LW1> LW2, LW1 can take a range of, for example, 7 to 12 mm, and LW2 can take a range of, for example, 2 to 3 mm.

The first switch accommodating portion 105a for the main runner groove has an inner diameter SW1 larger than the width LW1 of the main runner groove, and the second switch accommodating portion 105b for the sub runner groove has an inner diameter SW1 larger than the width LW2 of the sub runner groove. Also has a large inner diameter SW2. SW1> SW2, for example, SW1 can be in the range of 9 to 14 mm and SW2 can be in the range of 3 to 4 mm. Therefore, as for the inner diameter of the switch accommodating portion, the inner diameter of the first switch accommodating portion 105a is larger than the inner diameter of the second switch accommodating portion 105b.

In the present embodiment, the inner diameter of the switch accommodating portion is common to magnetic switches of the same type. For example, the inner diameter of the first switch accommodating portion 105a of the main runner groove is larger than the shortest length of the main runner groove in the molding die to be used. Is also a small value. Similarly, the inner diameter of the second switch accommodating portion 105b of the secondary runner groove is set to a value smaller than the shortest length of the secondary runner groove in the molding used. This makes it possible to apply to any main runner groove and sub runner groove.

In the molding apparatus shown in FIG. 1, after forming a molded product by flowing a molding material into a runner groove or a molding space (cavity) for forming each part, the moving mold main body 102 is separated from the fixed mold main body 103. , The pressing plate 116 is pressed to move the extrusion plate 112. At this time, the magnetic switch 104 is supported by the spherical concave surface at the end of the molded product and remains on the male mold 106 side, so that the risk of damaging the molding mold due to accidental removal can be reliably avoided. it can. The magnetic switch 104 remaining in the male type 106 can be recovered by attracting with a magnet having a strong magnetic force such as a neodymium magnet. Further, the knockout pin 113 provided on the extrusion plate 112 extrudes the molded product attached to the male mold 106 constituting the moving mold main body 102, and the molded product can be easily taken out. Note that FIG. 1 is a diagram showing the structure of the molding apparatus as an example, and the structure of the molding apparatus is not limited to that shown in FIG. 1, and various changes can be made.

Next, with reference to FIG. 2, the positional relationship between the magnetic switch 104 and the

runner grooves

105a and 105b formed on the molding die will be described. In FIG. 2, the relationship between the magnetic switch 104 and the first switch accommodating portion 105a of the main runner groove formed in the male mold 106 will be described, but the second switch accommodating portion 105b and the sub runner on the male mold 106 will be described. Since the contents of the relationship with the groove and the relationship when each runner groove is formed in the female mold 118 are the same, the description thereof will be omitted.

First, FIG. 2A shows a male type 106 in a state before the magnetic switch 104 is attached. A main runner groove 201 is formed in the male type 106, and a recess 202 for mounting the magnetic switch 104 is formed in the middle of the main runner groove 201. The recess 202 constitutes a part of the first switch accommodating portion 105a shown in FIG.
In the state shown in FIG. 2A, since the main runner groove 201 is not blocked by the magnetic switch 104, the supplied molding material can flow over the recess 202 and on the main runner groove 201. FIG. 2B is a cross-sectional view taken along the line AA of FIG. 2A, and the recess 202 has a spherical concave surface corresponding to the outer surface shape of the magnetic switch 104, which is a spherical member.

FIG. 2C shows an example of a state in which the magnetic switch 104 is attached to the recess 202. Since the magnetic switch 104 has a spherical shape, it contacts and attracts the concave portion 202 having the corresponding inner surface on the surface. As a result, the main runner groove 201 is disconnected by the magnetic switch 104, so that the molding material cannot flow beyond the magnetic switch 104. FIG. 2D is a cross-sectional view taken along the line BB of FIG. 2C, in which the magnetic switch 104 is attracted to the inner surface of the recess 202.

Next, a usage pattern of the magnetic switch 104 will be described with reference to FIG. FIG. 3 shows an enlarged view of the broken line portion 121 shown in FIG. 1 and shows an example of a state in which the molding material is poured into the runner grooves provided in the male mold 106 and the female mold 118. In FIG. 3, the relationship between the magnetic switch 104 and the second switch accommodating portion 105b in the auxiliary runner groove formed in the male type 106 and the female type 118 will be described, but the first switch formed in the main runner groove will be described. Since the contents of the relationship with the accommodating portion 105a are the same, the description thereof will be omitted.

FIG. 3A shows a cross-sectional view of a state in which the magnetic switch 104 is not accommodated in the second switch accommodating portion 105b. In FIG. 3B, the magnetic switch 104 is housed in the second switch housing portion 105b, and the connection of the sub-runner groove is cut off by the magnetic switch 104.

In FIG. 3, it is assumed that the left side of the alternate long and short dash line 303 is upstream from the alternate long and short dash line 303, and the molding material is supplied from the upstream side. On the right side of the alternate long and short dash line 303, the presence or absence of the magnetic switch 104 controls whether the inflow of the molding material is blocked or allowed. In FIG. 3A, since the magnetic switch 104 is not accommodated in the second switch accommodating portion 105b, the inflow of the molding material is allowed. Therefore, the molded product 301 is molded beyond the region of the second switch accommodating portion 105b. On the other hand, in FIG. 3B, the magnetic switch 104 is housed in the second switch housing portion 105b, and the molding material flowing into the sub-runner groove collides with the side surface of the magnetic switch 104 and is on the downstream side. The inflow to is blocked. Since the molding material is blocked by the magnetic switch 104 in this way, the molded product 302 is not molded beyond the magnetic switch 104.

FIG. 3C is a diagram showing the relationship between the molded product 302 and the magnetic switch 104 in the portion surrounded by the dotted line 304 in FIG. 3B. The dotted line 305 shows a part of the contour of the magnetic switch 104, and the molded product 302 is formed so as to have a spherical concave surface 306 along the contour 305. Since the magnetic switch 104 is supported by such a spherical concave surface 306, the position of the magnetic switch 104 is fixed in the male mold 106 in which the molded product remains when the male mold 106 and the female mold 118 are separated, and the position of the magnetic switch 104 is easily fixed. It will not fall out.

Next, a method of applying the above magnetic switch 104 to a molding die to form a molded product will be described with reference to FIGS. 4 to 7.

First, FIG. 4A shows an example of a molding die before applying the magnetic switch 104. The molding die 400 is a molding die having a plurality of molding spaces (cavities) 403a to 403e (hereinafter, referred to as “cavity 403” for simplicity) as part molding portions for forming a plurality of parts, and each cavity 403. Is connected to the main runner groove 401 via the sub runner groove 402. When the molten molding material is injected from the molding material injection port 404, the molding material flows from the main runner groove 401 into the cavity 403 via the sub runner groove 402. After the molding material is filled in all the cavities 403, a molded product can be produced by cooling.

Next, FIG. 4B shows an example of the molding die 400A provided with the switch accommodating portions 405 and 406 for accommodating the magnetic switch 104 in the molding die 400. In the molding die 400A of FIG. 4B, the first switch accommodating portions 405a to 405e are provided on the main runner groove 401. The second switch accommodating portions 406a to 406f are provided on the sub-runner groove 402. The first switch accommodating portion 405 can be provided on the main runner groove for molding the main runner connected to the sub runner connected to the parts when it is desired to collectively exclude a plurality of parts from the molding target. Further, the second switch accommodating portion 406 can be provided in all the runner grooves directly connected to the target part in order to control whether or not to mold each part. Here, the inner diameter of the first switch accommodating portion 405 is larger than the inner diameter of the second switch accommodating portion 406.

When the second switch accommodating portion 406 is applied to the sub-runner groove forming the sub-runner connected to the main runner on the downstream side of the main runner in which the first switch accommodating portion 405 is arranged, the first switch accommodating portion 406 is applied. By using the switch accommodating portion 405, the parts on the downstream side of the main runner can be excluded from the formation target, while the formation target is determined for each part by individually using the second switch accommodating portion 406. Can be done. Further, the position of the second switch accommodating portion 406 does not have to be on the downstream side of the main runner in which the first switch accommodating portion 405 is arranged. If it is desired to exclude only a specific part from the formation target, the first switch accommodating portion 405 may not be arranged, and only the second switch accommodating portion 406 may be arranged. The mold may include at least one of the first switch accommodating portion 405 and the second switch accommodating portion 406.

In the example of FIG. 4B, the second switch accommodating portions 406a to 406f are provided on the sub-runner groove 402 so as to surround the

cavities

403a and 403e. Thereby, it is possible to control whether or not the

cavities

403a and 403e are individually molded. Further, the second switch accommodating portion 406g is provided on a part of the sub-runner 402 connected to the cavity 403c. The second switch accommodating portion 406g is used together with the first switch accommodating portions 405a to 405c when the cavities 403a to 403c are not formed.

In FIG. 4B, the magnetic switch 104 is not mounted on the first switch accommodating portion 405 and the second switch accommodating portion 406, and the molding material is allowed to flow into the cavity 403. .. Therefore, the molding results using the

molding molds

400 and 400A of FIGS. 4 (a) and 4 (b) are substantially the same. FIG. 4C is a molded product 410A obtained when the molding mold 400A of FIG. 4B is used.

The molded product 410A is composed of a main runner 411, a sub runner 412, and parts 413a to 413e, and each part 413a to 413e has a shape corresponding to cavities 403a to 403e of the molding die 400 or the like. These parts 413a to 413e are connected to the main runner 411 via the sub runner 412. Further, the main runner 411 is formed with a first spherical convex surface (spherical convex portion) corresponding to the first switch accommodating portion 405, and the sub runner has a second spherical convex surface corresponding to the second switch accommodating portion 406. (Spherical convex portion) is formed. Here, the diameter of the first spherical convex surface is larger than the diameter of the second spherical convex surface.

Next, by mounting the magnetic switch 104 on the first switch accommodating portion 405 and the second switch accommodating portion 406 with reference to FIGS. 5 to 7, some or all of the parts included in the molded product 410A An example of controlling whether or not molding is performed will be described.

First, referring to FIG. 5, an example in which a magnetic switch 104 is attached to the first switch accommodating portion 405 and the second switch accommodating portion 406 so that some parts included in the molded product 410A are not molded. explain. FIG. 5A shows a molding die 400B when the magnetic switches 104a to 104d are arranged so that the molding material does not flow into the

cavities

403a, 403b, and 403c. At this time, the magnetic switches 104a to 104c are mounted on the first

switch accommodating portions

405a, 405b, and 405c so as to cut off the connection (flow of the molding member) of the main runner groove 401. On the other hand, the magnetic switch 104 is not mounted on the first switch accommodating portion 405d in order to supply the molding material to the

cavities

403d and 403e. However, if nothing is done, the molding material will flow into the secondary runner groove 402 for the cavity 403c connected to the main runner groove 401 provided with the first switch accommodating portion 405d. Therefore, a magnetic switch 104d is attached to the second switch accommodating portion 406g.

The molding result using the molding die 400B shown in FIG. 5 (a) is as shown in FIG. 5 (b). The molded product 410B is composed of a main runner 411, a sub runner 412,

parts

413d and 413e, and parts 413a to 413c are not molded. At this time, the main runner 411 has an end portion (for example, the end portion indicated by reference numeral 501 in FIG. 5B) formed by shutting off the supply of the molding material by the magnetic switch 104. The end is formed orthogonal to a plane formed by the main runner 411 and the sub-runner 412 (eg, a plane parallel to the front surface of FIG. 5) and has a spherical concave surface corresponding to the spherical surface of the magnetic switch 104.

Next, an example will be described in which a part of the parts included in the molded product 410 is not molded by mounting the magnetic switch 104 on the second switch accommodating portion 406 with reference to FIG. First, FIG. 6A shows a molding die 400C when the magnetic switches 104a to 104f are mounted on the second switch accommodating portions 406a to 406f so that the molding material does not flow into the

cavities

403a and 403e. At this time, the magnetic switch 104 is not mounted on the first switch accommodating portions 405a to 405e and the second switch accommodating portion 406g. As a result, the inflow of the molding material from the second switch accommodating portion 406a to the

cavities

403a and 403e connected to the sub-runner groove 402 provided with the 406f is blocked.

The molding result using the molding die 400C shown in FIG. 6 (a) is as shown in FIG. 6 (b). The molded product 410C is composed of a main runner 411, a sub runner 412, and parts 413b to 413d, and does not include

parts

413a and 413e. At this time, the sub-runner 412 has an end portion formed by shutting off the supply of the molding material by the magnetic switch 104. In FIG. 6B, an end portion 601 and an end portion 602 are formed on each of the two sub-runners 412 arranged in parallel. In addition to this, the ends may be formed so as to face each other. The end is formed orthogonal to a plane formed by the main runner 411 and the sub-runner 412 (eg, a plane parallel to the front surface of FIG. 6) and has a spherical concave surface corresponding to the spherical surface of the magnetic switch 104.

Next, an example will be described in which the parts included in the molded product 410 are not molded by mounting the magnetic switch 104 on the first switch accommodating portion 405 with reference to FIG. 7. First, FIG. 7A shows a molding die 400D when the magnetic switches 104a to 104d are mounted on the first

switch accommodating portions

405a, 405b, 405d and 405e so that the molding material does not flow into the cavities 403a to 403e. .. At this time, it is not necessary to mount the magnetic switch 104 on the other first switch accommodating portion 405c and the second switch accommodating portions 406a to 406g. As a result, the molding member does not flow downstream from each switch housing portion of the main runner groove 401 provided with the first

switch housing portions

405a, 405b, 405d and 405e, so that the molding material for the cavities 403a to 403e All inflows are blocked.

The molding result using the molding die 400D shown in FIG. 7 (a) is as shown in FIG. 7 (b). In the molded product 410D, no parts are included on the left side of the molded material injection port 404. At this time,
The main runner 411 has an end portion (for example, the end portion indicated by reference numeral 701 in FIG. 7B) formed by shutting off the supply of the molding material by the magnetic switch 104. The end is formed orthogonal to a plane formed by the main runner 411 and the sub-runner 412 (eg, a plane parallel to the front surface of FIG. 7) and has a spherical concave surface corresponding to the spherical surface of the magnetic switch 104.

In the above embodiment, the molding method using the molding apparatus 101 is selected by switching between the case of using the molding die 400A of FIG. 4 and the case of using any of the molding dies 400B to 400D of FIGS. 5 to 7. Can be executed. Here, the original product can be made using the molding die 400A, and the variation product can be made using any of the molding dies 400B to 400D.

According to the embodiment described above, by arranging the switch accommodating portions in the main runner groove and the sub runner groove included in the molding die, some parts of the plurality of parts constituting the molded product can be formed. It can be controlled to be excluded from the molding target individually or collectively. As a result, when a variation product is planned and one of the main parts included in the molding mold is replaced with another new part, the main part not used in the product can be excluded from the molding target. .. In particular, according to the present embodiment, by using a magnet switch, it is possible to switch between molding and non-molding in units of runner frames or individual parts, so that it is easy to deal with variation products and variation products. It is possible to prevent unused parts from being molded and waste of molding materials. Further, if such an unnecessary part is included in the molded product, it is necessary to notify the product purchaser that the part is unnecessary, but in the present embodiment, the part is excluded from the molding target. Since it is not included in the product, such trouble can be omitted.

Further, in the present embodiment, the diameter SW1 of the first switch accommodating portion formed in the main runner groove is larger than the width LW1 of the main runner groove included in the molding die used, but is the shortest main in the molding die used. The value is smaller than the length of the runner groove. Further, the diameter SW2 of the second switch accommodating portion formed in the secondary runner groove is larger than the width LW2 of the secondary runner groove included in the molding die used, but is larger than the shortest length of the secondary runner groove in the molding die used. Is also a small value. Thereby, the first switch accommodating portion can be applied to any main runner groove on the molding die, and the second switch accommodating portion can be applied to any sub runner groove on the molding die. It is possible to do.

Therefore, the first switch accommodating portion can be added later to the desired main runner groove of the molding die, and the second switch accommodating portion can be added later to the desired sub runner groove of the molding die. It is possible. At that time, the processing performed to add the switch accommodating portion is only to form a spherical concave surface on the surface of the mold by, for example, a drill, so that the work can be suppressed to the minimum necessary. The diameter of the switch accommodating portion can be set according to the size of the available magnetic switch as long as it is smaller than the length of the shortest runner groove in the molding die.

Therefore, when a variation product is planned, it can be arbitrarily added to the existing molding mold according to the form of the product. Further, since the switch accommodating portion has two states, that is, the magnetic switch 104 is attached or not attached. Therefore, it is an unnecessary part in a certain variation product, and after the magnetic switch is attached, a further variation product is provided. Even if the part is needed, the same molding mold can be reused simply by removing the magnetic switch using a magnet, so there is no disadvantage in adding a switch structure.

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

Claims

A first molding step of injecting a molding material into a molding mold made of a magnetic material to mold a first molded product composed of a plurality of parts connected to a runner, and a molding material into the molding mold. Is injected to form a second molded product, which is a second molded product and does not include a part of the plurality of parts constituting the first molded product. A molding method for molding a molded product, wherein the molding mold blocks the inflow of the molding material into a predetermined portion of the molding mold corresponding to a part of the plurality of parts by attaching / detaching a magnetic switch. Further, a switch accommodating portion for allowing is provided, and in the first molding step, the inflow of the molding material is permitted because the magnetic switch is not mounted on the switch accommodating portion, and the plurality of molding materials corresponding to the predetermined portion. The first molded product containing a part of the parts is formed, and in the second molding step, the inflow of the molding material is blocked by mounting the magnetic switch in the switch accommodating portion, and the above. A molding method characterized in that the second molded product that does not include a part of the plurality of parts corresponding to a predetermined portion is formed.
In the molding die, the switch accommodating portion is provided in the runner groove for forming the runner, and in the second molding step, the runner groove on the downstream side of the switch accommodating portion to which the magnetic switch is mounted. The molding method according to claim 1, wherein the inflow of the molding material into the predetermined portion including the above-mentioned predetermined portion is blocked.
The molding die includes a plurality of part molding portions for molding the plurality of parts, a main runner groove for supplying the molding material to each of the plurality of part molding portions, and the main runner groove and the part molding. The switch accommodating portion includes a sub-runner groove for connecting the portions and supplying the molding material from the main runner groove to the parts molding portion. The switch accommodating portion is a first switch accommodating portion provided in the main runner groove. The molding method according to claim 2, further comprising at least one of the second switch accommodating portion provided in the sub-runner groove.
The molding method according to claim 3, wherein the diameter of the first switch accommodating portion is larger than the diameter of the second switch accommodating portion.
The molding method according to claim 4, wherein the diameter of the second switch accommodating portion is smaller than the length of the shortest auxiliary runner groove of the molding die.
The molding method according to claim 4 or 5, wherein the diameter of the second switch accommodating portion is 4 mm.
The molding method according to any one of claims 3 to 6, wherein the second switch accommodating portion is provided on the downstream side of the first switch accommodating portion.
The second switch accommodating portion according to any one of claims 3 to 7, wherein the second switch accommodating portion is provided in all the auxiliary runner grooves connected to the part molding portion for blocking the inflow of the molding material. Molding method.
The molding method according to any one of claims 2 to 8, wherein the magnetic switch is a spherical magnet, and the switch accommodating portion has a recess corresponding to the spherical shape of the magnetic switch.
A model part containing at least one molded product connected to a second runner connected to the first runner, which is spherical at at least one end of the first runner and the second runner. A model part characterized by having a concave surface.
The model component according to claim 10, wherein the end portion is orthogonal to a plane composed of the first runner and the second runner.
The model component according to claim 10 or 11, wherein each of the runners of the same type arranged in parallel has the end portion.
When the first runner and the second runner each have the spherical concave surface, the diameter of the spherical concave surface formed on the first runner is larger than the diameter of the spherical concave surface formed on the second runner. The model part according to any one of claims 10 to 12, characterized in that it is large.
The model component according to any one of claims 10 to 13, wherein at least one of the first runner and the second runner has a spherical convex surface.
When the first runner and the second runner each have the spherical convex surface, the diameter of the spherical convex surface formed on the first runner is larger than the diameter of the spherical convex surface formed on the second runner. The model part according to claim 14, which is characterized by being large.