Forming method

Abstract

To provide a molding method that can easily switch whether or not each part should be molded in a molding die; and a model component that is molded by the molding method.SOLUTION: There is provided a molding method for molding a molded product by selectively executing: a first molding step of molding a first molded product that is formed of a plurality of parts which are connected to a runner, by injecting a molding material into a molding die that is formed from a magnetic material; and a second molding step of molding a second molded product that does not include a part of the plurality of parts constituting the first molded product, by injecting a molding material into the molding die. The molding die includes a switch housing part for blocking or allowing inflow of the molding material into a predetermined portion of the molding die, which corresponds to a part of the plurality of parts, by attachment or detachment of a magnetic switch.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a moulding method and a model part. [Background technology]

[0002] Generally, molded products such as plastic models made of resin are constructed by connecting multiple parts to be assembled to a runner (see Patent Document 1). Although different combinations of parts are generally provided depending on the type and shape of the finished product that is to be made by assembling the parts, there are also variations of products that, although different in finished product, have common parts with only some parts being different. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-142578 A Summary of the Invention [Problem to be solved by the invention]

[0004] When molding parts for variant products like those mentioned above, it is possible to create a dedicated molding tool (metal mold) for each product. It is also possible to simply repurpose the original product's mold to mold parts that will not be used in the variant products. In the former case, costs are incurred to create additional molding tools just for some of the unnecessary parts, which is inefficient, while in the latter case, parts that will not be used in the variant products are molded, resulting in waste of molding material.

[0005] Therefore, there is a demand for a technology that allows for easy switching between molding and not molding each part in a molding die, thereby enabling molding of only the required common parts.

[0006] The present invention provides a molding method that allows easy switching between molding and not molding each part in a molding die, and a model part molded by the molding method. [Means for solving the problem]

[0007] The present invention is a molding method a first molding step of injecting a molding material into a mold formed of a magnetic material to mold a first molded product having a plurality of parts connected to a runner; a second molding step of injecting a molding material into the mold to mold a second molded product, the second molded product not including some of the parts constituting the first molded product; A molding method for molding a molded product by selectively carrying out the steps: the mold includes a switch accommodating portion for blocking or allowing the flow of the molding material into a predetermined portion of the mold corresponding to a part of the plurality of parts by attaching or detaching a magnetic switch; In the first molding step, since the magnetic switch is not attached to the switch accommodating portion, the molding material is allowed to flow in, and the first molded product including a part of the plurality of parts corresponding to the predetermined portion is formed; In the second molding process, a magnetic switch is attached to the switch accommodating portion, thereby blocking the flow of the molding material, and the second molded product is formed without including a portion of the multiple parts corresponding to the specified portion.

[0008] The model part is a model part including at least one molding connected to a second runner connected to a first runner, and has a spherical concave surface at at least one end of the first runner and the second runner. Effect of the Invention

[0009] According to the present invention, a model component can be molded by easily switching between molding and not molding each part in the molding die. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a cross-sectional view of a molding device according to an embodiment of the invention. [Diagram 2] (a) is an oblique view of the runner groove showing the state where the magnetic switch is not installed, (b) is a cross-sectional view in the state of (a), (c) is an oblique view of the runner groove showing the state where the magnetic switch is installed, and (d) is a cross-sectional view in the state of (c). [Diagram 3] FIG. 1(a) is a cross-sectional view of a mold showing the molding result when a magnetic switch is not attached, and FIG. 1(b) is a cross-sectional view of a mold showing the molding result when a magnetic switch is attached, and FIG. 1(c) is a diagram showing the relationship between the molded product and the magnetic switch in the molding result of (b). [Figure 4] 1A is a diagram showing an example of a mold 400 before the magnetic switch is applied, FIG. 1B is a diagram showing an example of a mold 400A after the magnetic switch is applied, and FIG. 1C is a diagram showing an example of a molded product 410A molded using 400 and 400A. [Diagram 5] FIG. 1A is a diagram showing an example of a molding die 400B partially equipped with a magnetic switch, and FIG. 1B is a diagram showing an example of a molded product 410B molded using 400B. [Figure 6] FIG. 4A is a diagram showing an example of a molding die 400C partially equipped with a magnetic switch, and FIG. 4B is a diagram showing an example of a molded product 410C molded using 400C. [Figure 7] FIG. 1A is a diagram showing an example of a molding die 400D partially equipped with a magnetic switch, and FIG. 1B is a diagram showing an example of a molded product 410D molded using 400D. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] 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 features among the multiple features described in the embodiments may be arbitrarily combined. In addition, the same reference numbers are used for the same or similar configurations, and duplicated descriptions are omitted.

[0012] In each drawing, the up, down, left and right directions relative to the paper surface are used as the up, down, left and right directions of the device in this embodiment when describing the present invention. In the embodiments described below, the present invention uses a resin material as an example of a molding material, but is not limited to this, and other materials (polystyrene, polyethylene, thermoplastic resins such as ABS, thermosetting resins, metals, etc.) can also be used.

[0013] A cross-sectional view of a molding device corresponding to an embodiment of the invention is shown in Figure 1. As shown in Figure 1, the molding device of this embodiment has a movable mold body 102 attached to the moving side of an injection device that injects molding material, and a fixed mold body 103 attached to the fixed side of the injection device. The movable mold body 102 and the fixed mold body 103 each have a groove formed therein through which the molding material flows.

[0014] The movable mold body 102 has a male mold attachment plate 107 to which a male mold 106 is attached, a fixed base 108 to which the male mold attachment plate 107 is fixed, a movable side attachment plate 109 to be attached to a molding material injection device, and a spacer 110 provided between the fixed base 108 and the movable side attachment plate 109. A cavity 111 is formed in the fixed base 108, and a movable push plate 112 is provided in the cavity 111. The push plate 112 is fixed to a pressing shaft 116 provided in openings 114 and 115 formed in the fixed base 108. In addition, a knockout pin 113 is formed in the push plate 112, which penetrates the male mold attachment plate 107 and the male mold 106. Here, the knockout pin 113 is formed so that the tip of the knockout pin 113 protrudes into the runner groove by moving the push plate 112.

[0015] The fixed mold body 103 has a fixed mounting plate 117 that is attached to the molding material injection device, a female mold mounting plate 119 to which a female mold 118 is attached, and a spacer 120 that is provided between the fixed mounting plate 117 and the female mold mounting plate 119.

[0016] Further, a space 105 into which the molding material flows is formed by grooves formed in the male mold 106 and the female mold 118. 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 the molding material to the cavity. Further, the runner groove is formed with switch accommodating portions 105a and 105b in which a magnetic switch 104 for controlling the supply of the molding material to a predetermined cavity can be mounted. The magnetic switch 104 can be configured as a spherical magnet, and the switch accommodating portions 105a and 105b have a concave surface (a hemispherical concave surface in this embodiment) corresponding to the shape of the magnetic switch 104 in order to attract the magnetic switch 104. A neodymium magnet can be used as the spherical magnet. The male mold 106 and the female mold 118 are formed from a magnetic material (for example, iron), and the magnetic switch 104 can be easily attracted to the switch accommodating portions 105a and 105b. In this embodiment, the case where both the male mold 106 and the female mold 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 using, for example, a neodymium magnet. In this embodiment, an example in which a spherical magnet is used as the magnetic switch 104 will be described, but this is not limited to this as long as it is possible to switch on and off the supply of molding material to the cavity by utilizing the magnetic attraction force to the male mold 106 or the female mold 118. For example, a cylindrical magnet may be used as the magnetic switch 104. In that case, a semi-cylindrical concave surface may be formed in the switch accommodating parts 105a and 105b to attract the magnetic switch 104.

[0017] In addition, in this embodiment, the runner groove may be a plurality of types of runner grooves with different widths, and each may be provided with a switch accommodating portion. Alternatively, the switch accommodating portion may be provided only in some of the plurality of types of runner grooves. In this embodiment, two types of runner grooves with different widths will be described. Specifically, there is a main runner groove having a first width (LW1) and a sub runner groove having a second width (LW2). LW1>LW2, and LW1 can be in the range of, for example, 7 to 12 mm, and LW2 can be in the range of, for example, 2 to 3 mm.

[0018] 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 secondary runner groove has an inner diameter SW2 larger than the width LW2 of the secondary runner groove. SW1>SW2, and 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, the inner diameter of the switch accommodating portion is larger for the first switch accommodating portion 105a than for the second switch accommodating portion 105b.

[0019] In this embodiment, the inner diameter of the switch accommodating portion is common to the same type of magnetic switch, for example, the inner diameter of the first switch accommodating portion 105a of the main runner groove is smaller than the length of the shortest main runner groove in the molding die used. Similarly, the inner diameter of the second switch accommodating portion 105b of the sub runner groove is smaller than the length of the shortest sub runner groove in the molding die used. This makes it possible to apply to any main runner groove and any sub runner groove.

[0020] In the molding apparatus shown in FIG. 1, after the molding material is poured into the molding space (cavity) for forming the runner groove and each part to form the molded product, the movable mold body 102 is separated from the fixed mold body 103, and the pressing plate 116 is pressed to move the push-out plate 112. At this time, the magnetic switch 104 remains on the male mold 106 side by being supported by the spherical concave surface of the end of the molded product, and the risk of the mold being damaged due to the magnetic switch 104 being accidentally removed can be reliably avoided. The magnetic switch 104 remaining on the male mold 106 can be collected by being attracted by a magnet having a strong magnetic force, such as a neodymium magnet. In addition, the knock-out pin 113 provided on the push-out plate 112 pushes out the molded product attached to the male mold 106 constituting the movable mold body 102, and the molded product can be easily removed. Note that FIG. 1 is a diagram showing an example of the structure of the molding apparatus, and the structure of the molding apparatus is not limited to that shown in FIG. 1, and various modifications are possible.

[0021] Next, the positional relationship between the magnetic switch 104 and the runner grooves 105a and 105b formed on the molding die will be described with reference to Fig. 2. 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 die 106 will be described, but the relationship between the second switch accommodating portion 105b and the sub runner groove on the male die 106, and the relationship when each runner groove is formed in the female die 118 are similar, so descriptions will be omitted.

[0022] First, FIG. 2(a) shows the male mold 106 in a state before the magnetic switch 104 is attached. The male mold 106 has a main runner groove 201 formed therein, and a recess 202 for attaching 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. 1. In the state shown in FIG. 2(a), the main runner groove 201 is not blocked by the magnetic switch 104, so the molding material supplied can flow over the recess 202 on the main runner groove 201. FIG. 2(b) is a cross-sectional view taken along the line AA in FIG. 2(a), 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.

[0023] 2(c) 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 comes into surface contact with the recess 202 having a corresponding inner surface and is adsorbed thereto. 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. 2(d) is a B-B cross-sectional view of FIG. 2(c), in which the magnetic switch 104 is adsorbed to the inner surface of the recess 202.

[0024] Next, the use of the magnetic switch 104 will be described with reference to Fig. 3. Fig. 3 shows an enlarged view of the dashed line portion 121 shown in Fig. 1, and shows an example of a state in which molding material is flowed into the runner grooves provided in the male die 106 and the female die 118. In Fig. 3, the relationship between the magnetic switch 104 and the second switch accommodating portion 105b in the sub-runner grooves formed in the male die 106 and the female die 118 will be described, but the relationship between the magnetic switch 104 and the first switch accommodating portion 105a formed in the main runner groove is similar in content, so description thereof will be omitted.

[0025] Fig. 3(a) shows a cross-sectional view of the second switch accommodating portion 105b when the magnetic switch 104 is not accommodated therein. Fig. 3(b) shows the second switch accommodating portion 105b when the magnetic switch 104 is accommodated therein, and the magnetic switch 104 cuts off the connection of the secondary runner groove.

[0026] In FIG. 3, the dashed line 303 is the boundary, and the left side of the dashed line 303 is the upstream side, and the molding material is supplied from the upstream side. On the right side of the dashed line 303, whether the inflow of the molding material is blocked or allowed is controlled depending on the presence or absence of the magnetic switch 104. In FIG. 3(a), the magnetic switch 104 is not accommodated in the second switch accommodating portion 105b, so the inflow of the molding material is allowed. Therefore, the molding 301 is molded beyond the area of ​​the second switch accommodating portion 105b. On the other hand, in FIG. 3(b), the magnetic switch 104 is accommodated in the second switch accommodating portion 105b, and the molding material that has flowed into the sub-runner groove collides with the side of the magnetic switch 104, and the inflow to the downstream side is blocked. In this way, the molding material is blocked by the magnetic switch 104, so the molding 302 is not molded beyond the magnetic switch 104.

[0027] Fig. 3(c) is a diagram showing the relationship between the molded article 302 and the magnetic switch 104 in the portion surrounded by the dotted line 304 in Fig. 3(b). The dotted line 305 indicates a part of the outline of the magnetic switch 104, and the molded article 302 is formed to have a spherical concave surface 306 that follows the outline 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 article remains when the male mold 106 and the female mold 118 are separated, and the magnetic switch 104 does not easily fall off.

[0028] Next, a method of molding a molded product by applying the above-mentioned magnetic switch 104 to a molding die will be described with reference to FIGS.

[0029] First, Fig. 4(a) shows an example of a molding die before application of the magnetic switch 104. The molding die 400 is a molding die having a plurality of molding spaces (cavities) 403a to 403e (hereinafter, for simplicity, referred to as "cavities 403") as part molding portions for forming a plurality of parts, and each cavity 403 is connected to a main runner groove 401 via a sub-runner groove 402. When molten molding material is injected from a molding material injection port 404, the molding material flows from the main runner groove 401 through the sub-runner groove 402 into the cavity 403. After all the cavities 403 are filled with the molding material, the molding material is cooled to produce a molded product.

[0030] Next, FIG. 4(b) shows an example of a molding die 400A provided with switch accommodating sections 405 and 406 for accommodating the magnetic switch 104 in the molding die 400. In the molding die 400A of FIG. 4(b), the first switch accommodating sections 405a to 405e are provided on the main runner groove 401. The second switch accommodating sections 406a to 406f are provided on the sub-runner groove 402. The first switch accommodating section 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 exclude a plurality of parts from the molding target collectively. Also, the second switch accommodating section 406 can be provided on all of the runner grooves directly connected to the target parts in order to control whether or not to mold each part. Here, the inner diameter of the first switch accommodating section 405 is larger than the inner diameter of the second switch accommodating section 406.

[0031] When the second switch accommodating portion 406 is applied to a secondary runner groove that molds a secondary runner connected to a main runner downstream of the main runner in which the first switch accommodating portion 405 is arranged, the first switch accommodating portion 405 can be used to exclude parts downstream of the main runner from the forming target, while the second switch accommodating portion 406 can be used individually to determine the forming target for each part. In addition, the position where the second switch accommodating portion 406 is arranged does not have to be the downstream side of the main runner in which the first switch accommodating portion 405 is arranged. When it is desired to exclude only a specific part from the forming target, it is sufficient to arrange only the second switch accommodating portion 406 without arranging the first switch accommodating portion 405. The molding die may include at least one of the first switch accommodating portion 405 and the second switch accommodating portion 406.

[0032] In the example of FIG. 4(b), second switch accommodating portions 406a to 406f are provided on the secondary runner groove 402 so as to surround the cavities 403a and 403e. This makes it possible to control whether or not the cavities 403a and 403e are molded individually. In addition, the second switch accommodating portion 406g is provided on a portion of the secondary runner 402 that is 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 molded.

[0033] In Fig. 4(b), the magnetic switch 104 is not attached to 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 dies 400 and 400A in Fig. 4(a) and Fig. 4(b) are substantially the same. Fig. 4(c) shows a molded product 410A obtained when the molding die 400A in Fig. 4(b) is used.

[0034] Molded product 410A is composed of main runner 411, sub runner 412, and parts 413a to 413e, and each of parts 413a to 413e has a shape corresponding to cavity 403a to 403e of mold 400 or the like. These parts 413a to 413e are connected to main runner 411 via sub runner 412. Also, main runner 411 is formed with a first spherical convex surface (spherical convex portion) corresponding to first switch accommodating portion 405, and sub runner is formed with a second spherical convex surface (spherical convex portion) corresponding to second switch accommodating portion 406. Here, the diameter of the first spherical convex surface is larger than the diameter of the second spherical convex surface.

[0035] Next, referring to Figures 5 to 7, an example will be described in which a magnetic switch 104 is attached to the first switch accommodating portion 405 and the second switch accommodating portion 406 to control whether or not to mold some or all of the parts contained in the molding 410A.

[0036] First, referring to FIG. 5, an example in which some parts included in the molded product 410A are not molded by mounting the magnetic switch 104 in the first switch housing portion 405 and the second switch housing portion 406 is described. FIG. 5(a) shows the mold 400B in which 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 in the first switch housing portions 405a, 405b, and 405c so as to cut off the connection (flow of the molded material) of the main runner groove 401. On the other hand, the magnetic switch 104 is not mounted in the first switch housing portion 405d in order to supply the molding material to the cavities 403d and 403e. However, if this is left as it is, the molding material will flow into the sub runner groove 402 for the cavity 403c that is connected to the main runner groove 401 in which the first switch housing portion 405d is provided. Therefore, the magnetic switch 104d is attached to the second switch housing portion 406g.

[0037] 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, and parts 413d and 413e, and parts 413a to 413c are not molded. At this time, the main runner 411 has an end (for example, an end indicated by reference number 501 in Fig. 5(b)) formed by cutting off the supply of molding material by the magnetic switch 104. The end is formed perpendicular to the plane (for example, a plane parallel to the front in Fig. 5) formed by the main runner 411 and the sub-runner 412, and has a spherical concave surface corresponding to the spherical surface of the magnetic switch 104.

[0038] Next, referring to FIG. 6, an example in which some parts included in the molded product 410 are not molded by mounting the magnetic switch 104 in the second switch housing portion 406 will be described. First, FIG. 6(a) shows the molding die 400C in which the magnetic switches 104a to 104f are mounted in the second switch housing 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 in the first switch housing portions 405a to 405e and the second switch housing portion 406g. This blocks the inflow of the molding material into the cavities 403a and 403e connected to the sub-runner groove 402 in which the second switch housing portions 406a to 406f are provided.

[0039] 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 the main runner 411, the sub-runner 412, and parts 413b to 413d, but does not include parts 413a and 413e. At this time, the sub-runner 412 has an end formed by cutting off the supply of molding material by the magnetic switch 104. In FIG. 6(b), end 601 and end 602 are formed on each of the two sub-runners 412 arranged in parallel. In addition, the end may be formed to face each other. The end is formed perpendicular to the plane formed by the main runner 411 and the sub-runner 412 (for example, a plane parallel to the front of FIG. 6), and has a spherical concave surface corresponding to the spherical surface of the magnetic switch 104.

[0040] Next, referring to FIG. 7, an example in which the magnetic switch 104 is attached to the first switch accommodating portion 405 to prevent the molding of the parts included in the molded product 410 will be described. First, FIG. 7(a) shows the molding die 400D in which the magnetic switches 104a to 104d are attached to the first switch accommodating portions 405a, 405b, 405d, and 405e so that the molding material does not flow into the cavities 403a to 403e. In this case, the magnetic switch 104 does not need to be attached to the other first switch accommodating portion 405c and the second switch accommodating portions 406a to 406g. As a result, the molding material does not flow downstream of each switch accommodating portion of the main runner groove 401 in which the first switch accommodating portions 405a, 405b, 405d, and 405e are provided, so that the inflow of the molding material into the cavities 403a to 403e is completely blocked.

[0041] The molding result using the molding die 400D shown in Fig. 7(a) is as shown in Fig. 7(b). In the molding 410D, no parts are included to the left of the molding material injection port 404. At this time, the main runner 411 has an end portion (e.g., the end portion indicated by reference number 701 in Fig. 7(b)) formed by cutting off the supply of molding material by the magnetic switch 104. The end portion is formed perpendicular to the plane (e.g., a plane parallel to the front surface in Fig. 7) formed by the main runner 411 and the sub runner 412, and has a spherical concave surface corresponding to the spherical surface of the magnetic switch 104.

[0042] In the above embodiment, by switching between using the molding die 400A in Fig. 4 and using any of the molding dies 400B to 400D in Fig. 5 to 7, it is possible to selectively execute a molding method using the molding apparatus 101. Here, while an original product is made using the molding die 400A, a variation product can also be made using any of the molding dies 400B to 400D.

[0043] According to the embodiment described above, by disposing the switch accommodating parts in the main runner groove and the sub runner groove included in the molding die, it is possible to control so that some of the multiple parts constituting the molded product are 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 die is replaced with another new part, it is possible to exclude the main part not used in the product from the molding target. In particular, according to this embodiment, since it is possible to switch between molding and not molding for each runner frame or each individual part by using a magnet switch, it is easy to deal with variation products, and it is possible to prevent parts not used in the variation products from being molded and wasting molding material. In addition, if such unnecessary parts are included in the molded product, it is necessary to notify the product purchaser that the parts are unnecessary, but in this embodiment, the parts are excluded from the molding target and are not included in the product, so such trouble can be omitted.

[0044] In this 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 mold used, but is smaller than the length of the shortest main runner groove in the mold used. The diameter SW2 of the second switch accommodating portion formed in the sub runner groove is larger than the width LW2 of the sub runner groove included in the mold used, but is smaller than the length of the shortest sub runner groove in the mold used. This makes it possible for the first switch accommodating portion to be applied to any main runner groove on the mold, and for the second switch accommodating portion to be applied to any sub runner groove on the mold.

[0045] Therefore, the first switch accommodating portion can be added later to a desired main runner groove of the mold, and the second switch accommodating portion can be added later to a desired sub-runner groove of the mold. In this case, the processing required to add the switch accommodating portion is, for example, simply forming a spherical concave surface on the surface of the mold with a drill, so that the amount of work can be kept to a minimum. The diameter of the switch accommodating portion can be set to match the size of an available magnetic switch, as long as it is smaller than the length of the shortest runner groove in the mold.

[0046] Therefore, when a variation product is planned, it can be added to the existing molding die as desired according to the shape of the product. Also, since the switch accommodating section has two states, that is, with or without the magnetic switch 104 attached, even if a part that is unnecessary for one variation product is attached and then the part becomes necessary for a further variation product, the same molding die can be reused simply by removing the magnetic switch using a magnet, so there is no disadvantage to adding a switch structure.

[0047] The invention is not limited to the above-described embodiment, and various modifications and variations are possible within the scope of the gist of the invention.

Claims

1. a first molding step of injecting a molding material into a metal mold to mold a first molded product having a plurality of parts connected to a runner; a second molding step of injecting a molding material into the mold to mold a second molded product, the second molded product not including some of the parts constituting the first molded product; A molding method for molding a molded product by selectively carrying out the steps: the mold includes a receiving portion for blocking or allowing the inflow of the molding material into a predetermined portion of the mold corresponding to a part of the plurality of parts by attaching or detaching a spherical member; in the first molding step, since no spherical member is attached to the accommodation portion, an inflow of the molding material is permitted, and the first molded product is formed, the first molded product including a part of the plurality of parts corresponding to the predetermined portion; In the second molding step, a spherical member is attached to the accommodation portion to block the inflow of the molding material, and the second molded product is formed without including a portion of the plurality of parts corresponding to the predetermined portion, A molding method, wherein the accommodating portion is formed on a surface of the mold that has a groove for molding the molded product, without penetrating the mold.

2. The accommodation portion is provided in a runner groove for forming the runner of the mold, The molding method described in claim 1, characterized in that in the second molding process, the flow of the molding material to the specified portion including the runner groove downstream of the accommodating portion in which the spherical member is attached is blocked.

3. The mold includes a plurality of part molding sections for molding the plurality of parts, a main runner groove for supplying the molding material to each of the plurality of part molding sections, and a sub-runner groove for connecting the main runner groove and the part molding sections and supplying the molding material from the main runner groove to the part molding sections. The molding method according to claim 2, characterized in that the accommodating portion includes at least one of a first accommodating portion provided in the main runner groove and a second accommodating portion provided in the sub-runner groove.

4. 4. The molding method according to claim 3, wherein a diameter of the first housing portion is larger than a diameter of the second housing portion.

5. The molding method according to claim 4, wherein the diameter of the second housing portion is smaller than the length of the shortest auxiliary runner groove of the mold.

6. 6. The molding method according to claim 4, wherein the second housing portion has a diameter of 4 mm.

7. The molding method according to any one of claims 3 to 6, wherein the second container portion is provided downstream of the first container portion.

8. The molding method according to any one of claims 3 to 7, characterized in that the second accommodating portion is provided in all of the auxiliary runner grooves connected to the part molding portion to which the inflow of the molding material is to be blocked.

9. 9. The molding method according to claim 1, wherein the spherical member is a spherical magnet, and the accommodation portion has a recess corresponding to the spherical shape of the spherical member.

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