Injection molding mold and injection molding system

Abstract

The invention provides a mold for injection molding and an injection molding system. An injection molding mold is provided with: a first mold in which an ingate opening is formed; and a second mold that moves in the mold opening direction by mold opening, the second mold being provided with: a third mold; a fourth mold disposed between the third and first molds in the mold opening direction; and a fifth mold that is disposed between the fourth mold and the first mold in the mold opening direction and that forms a cavity from the third and fourth molds, the fourth mold having a channel, the fifth mold having a first through-hole, the first mold having a recess in a surface facing the second mold, the fifth mold being disposed in the recess when the mold is closed, and the fifth mold being disposed in the recess when the mold is closed. A groove penetrating downward in the vertical direction is formed in at least one of an opposing surface of at least one of the third and fourth molds, an opposing surface of at least one of the fourth and fifth molds, an opposing surface of at least one of the fifth and first molds, and an opposing surface of at least one of the fourth and first molds.

Description

Technical Field

[0001] The present disclosure relates to a mold for injection molding and an injection molding system. Background Art

[0002] For example, Patent Document 1 discloses a metal powder injection molding mold having a plurality of gates for introducing a metal powder injection molding material into a cavity and a runner connecting a sprue and the gates.

[0003] When a mold for injection molding is clamped, if a used molding material or the like is sandwiched between two different molds, there is a problem that the molds cannot be properly contacted with each other, resulting in a molding defect.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2013-204122 Summary of the invention

[0005] According to a first aspect of the present disclosure, a mold for injection molding is provided. The mold for injection molding has a plurality of molds and forms a cavity that specifies the shape of a product, and the mold for injection molding comprises: a first mold, which forms an ingrate opening for a molding material to flow in; a second mold, which moves in a direction away from the first mold and in a direction perpendicular to a vertical direction, i.e., a mold opening direction, by opening the mold, and the second mold comprises: a third mold; a fourth mold, which is arranged between the third mold and the first mold in the mold opening direction; a fifth mold, which is arranged between the fourth mold and the first mold in the mold opening direction, and the cavity is formed by the third mold and the fourth mold, and the fourth mold comprises a channel for the molding material to pass from the ingrate opening toward the cavity, and the fifth mold comprises a channel for the molding material to pass from the ingrate opening toward the channel. The first mold has a recessed portion on a surface opposite to the second mold, and the fifth mold is arranged in the recessed portion when the molds are closed. Through the mold opening, a space is formed between the third mold and the fourth mold, between the fourth mold and the fifth mold, between the fifth mold and the first mold, and between the fourth mold and the first mold in the mold opening direction. A groove penetrating downward in the vertical direction is formed on at least any one of the opposing surfaces of at least one of the third mold and the fourth mold, at least any one of the opposing surfaces of at least one of the fourth mold and the fifth mold, at least any one of the opposing surfaces of at least one of the fifth mold and the first mold, and at least any one of the opposing surfaces of at least one of the fourth mold and the first mold.

[0006] According to a second aspect of the present disclosure, an injection molding system is provided. The injection molding system comprises an injection molding mold of the above aspect and an open gate nozzle for injecting the molding material, the molding material comprises metal powder, the fifth mold comprises a second through hole connected to the channel, the first mold comprises a support portion, the support portion is inserted into the second through hole and supports the molding material filled in the channel, the support portion comprises a third portion having a first value of a cross-sectional area perpendicular to the mold opening direction and a fourth portion having a second value of a cross-sectional area smaller than the first value, the third portion being formed on the top side of the fourth portion.

[0007] According to a third aspect of the present disclosure, an injection molding system is provided. The injection molding system comprises: an injection molding device, which comprises the injection molding mold of the above aspect and a nozzle for injecting the molding material; a base for installing the injection molding device; a storage portion, which is arranged below the base and stores the discarded molding material, and a discard hole leading to the storage portion is formed on the base at a position corresponding to the bottom of the groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A side view of a mold for injection molding.

[0009] Figure 2 A side view of a mold for injection molding.

[0010] Figure 3 It is a cross-sectional view of the injection molding mold in a direction perpendicular to the vertical direction and the mold opening direction.

[0011] Figure 4 It is a cross-sectional view of the injection molding mold in a direction perpendicular to the vertical direction and the mold opening direction.

[0012] Figure 5 This figure shows a product molded using an injection molding mold and the shape of a runner.

[0013] Figure 6 It is a side view of the surface of the first mold facing the second mold.

[0014] Figure 7 This is a side view of the surface of the fifth mold that is opposite to the fourth mold.

[0015] Figure 8 It is a side view of the first mold and the fifth mold in a state where the fifth mold is arranged in the recessed portion of the first mold.

[0016] Fig. 9 It is a side view of the surface of the fifth mold which is opposite to the first mold.

[0017] Fig.10 It is a figure which shows an example of the 1st mold|die which does not form a groove in the surface which opposes a 4th mold|die.

[0018] Fig.11 It is a figure which shows an example of the 1st mold|die which does not form a groove in the surface which opposes a 4th mold|die.

[0019] Fig.12 It is a side view of the surface of the fifth mold in the second embodiment that faces the first mold.

[0020] Fig.13 It is an explanatory diagram showing a schematic configuration of an injection molding system in a third embodiment.

[0021] Fig.14 It is a perspective view of the support portion in the third embodiment.

[0022] Fig.15 It is a cross-sectional view showing the schematic structure of the injection unit.

[0023] Fig.16 This is a perspective view showing the schematic structure of a flat screw.

[0024] Fig.17 This is a schematic plan view of the barrel.

[0025] Fig.18 This is an explanatory diagram showing the schematic structure of the fixing part and the mold clamping part.

[0026] Fig.19 It is an explanatory diagram showing a schematic configuration of an injection molding system in a fourth embodiment. DETAILED DESCRIPTION

[0027] A. First Implementation Method:

[0028] Figure 1 as well as Figure 2 It is a side view of the mold 100 for injection molding. Figure 3 as well as Figure 4 2 is a cross-sectional view of the injection molding mold 100 in a direction perpendicular to the vertical direction and the mold opening direction described later. Figure 1 as well as Figure 3 FIG. 1 shows a state where all molds of the injection molding mold 100 are closed. Figure 2 as well as Figure 4 , all molds included in the injection molding mold 100 are shown in the open state. Figures 1 to 4 , arrows indicating mutually orthogonal X, Y, and Z directions are shown. The X direction and the Y direction are directions parallel to the horizontal plane. The Z direction is a direction parallel to the vertical direction. Figures 1 to 4The X, Y, and Z directions in the figure indicate the same directions as the X, Y, and Z directions in other drawings. When determining the direction, the direction indicated by the arrow mark, i.e., the positive direction, is set to "+", and the direction opposite to the direction indicated by the arrow mark, i.e., the negative direction, is set to "-", and both positive and negative symbols are used in the direction mark.

[0029] The injection molding mold 100 includes a first mold 10 and a second mold 20. The second mold 20 moves in the mold opening direction by the mold opening of the injection molding mold 100. Here, the mold opening direction refers to the direction away from the first mold 10, and is a direction perpendicular to the vertical direction. In addition, the direction opposite to the mold opening direction is also referred to as the mold closing direction. In this embodiment, the mold opening direction is the -X direction, and the mold closing direction is the +X direction.

[0030] The second mold 20 includes a third mold 30, a fourth mold 40, and a fifth mold 50. The fourth mold 40 is disposed between the third mold 30 and the first mold 10 in the mold opening direction. The fifth mold 50 is disposed between the fourth mold 40 and the first mold 10 in the mold opening direction. By closing the mold 100 for injection molding, as shown in FIG. Figure 3 As shown in the figure, the third mold 30 is in contact with the fourth mold 40, the fourth mold 40 is in contact with the fifth mold 50, the fifth mold 50 is in contact with the first mold 10, and the fourth mold 40 is in contact with the first mold 10. By opening the mold 100 for injection molding, as shown in FIG. Figure 4 As shown, in the mold opening direction, spaces are formed between the third mold 30 and the fourth mold 40 , between the fourth mold 40 and the fifth mold 50 , between the fifth mold 50 and the first mold 10 , and between the fourth mold 40 and the first mold 10 .

[0031] The first mold 10 and the fourth mold 40 are connected by a first connection member 61 fixed to the first mold 10 in such a manner that the first mold 10 and the fourth mold 40 are separated by a predetermined distance by opening the mold. The third mold 30 and the fourth mold 40 are connected by a second connection member 62 in such a manner that the third mold 30 and the fourth mold 40 are separated by a predetermined distance by opening the mold. The first mold 10 and the fifth mold 50 are connected by a third connection member 63 fixed to the first mold 10 in such a manner that the first mold 10 and the fifth mold 50 are separated by a predetermined distance by opening the mold.

[0032] The first mold 10 includes an ingrate opening 11, a recess 12, and a support portion 13. The ingrate opening 11 is a hole that penetrates the first mold 10 in the mold opening direction. When a product is molded using the injection molding mold 100, a molding material flows into the ingrate opening 11. The recess 12 and the support portion 13 are described below. In addition, the product is also referred to as a molded product.

[0033] like Figure 3 As shown, when the injection molding mold 100 is clamped, a cavity Cv defining the shape of the product is formed by the third mold 30 and the fourth mold 40. The cavity Cv is a space having a shape corresponding to the shape of the product.

[0034] The fourth mold 40 has a channel 41 for the molding material to pass from the ingate opening 11 of the first mold 10 toward the cavity Cv. The molding material flowing from the ingate opening 11 fills the channel 41 and the cavity Cv. In this specification, the molding material filled in the channel 41 and solidified is also referred to as a runner. Figure 5 , an example of the shape of a product 901 and a runner 902 molded using the injection molding die 100 is shown.

[0035] The fifth mold 50 includes a first through hole 51 and a second through hole 52 which penetrate the fifth mold 50 in the mold opening direction. The first through hole 51 is a hole for the molding material to pass from the ingate opening 11 toward the channel 41. The second through hole 52 is a hole connected to the channel 41 when the fourth mold 40 and the fifth mold 50 are in contact.

[0036] The support portion 13 is a columnar component protruding from the first mold 10 in the mold opening direction. In the present embodiment, the cross-sectional area of ​​the support portion 13 perpendicular to the mold opening direction is fixed regardless of the position on the support portion 13. The support portion 13 is inserted into the second through hole 52 of the fifth mold 50, and supports the molding material filled in the channel 41 of the fourth mold 40. That is, the support portion 13 supports the runner 902. The support portion 13 is provided on the first mold 10 in such a manner that the top end of the support portion 13 is located in the channel 41 when the injection molding mold 100 is closed, and the top end of the support portion 13 is housed inside the second through hole 52 when the injection molding mold 100 is opened.

[0037] In the mold opening of the injection molding mold 100, first, the third mold 30 and the fourth mold 40 are integrally moved relative to the first mold 10 in the mold opening direction. When the first mold 10 and the fourth mold 40 are separated by a predetermined distance, the movement of the third mold 30 and the fourth mold 40 in the mold opening direction is stopped by the first connecting member 61. At this time, the runner 902 remains on the first mold 10 side due to being supported by the support portion 13. Thus, the runner 902 is separated from the product 901. Next, in a state where the fourth mold 40 is stationary, the third mold 30 moves relative to the fourth mold 40 in the mold opening direction. When the third mold 30 and the fourth mold 40 are separated by a predetermined distance, the movement of the third mold 30 in the mold opening direction is stopped by the second connecting member 62. In a state where a space is formed between the third mold 30 and the fourth mold 40, the ejector pin 35 moves in the mold closing direction, thereby removing the product 901 from the injection molding mold 100. Finally, the fifth mold 50 moves relative to the first mold 10 in the mold opening direction. When the fifth mold 50 and the first mold 10 are separated by a predetermined distance, the movement of the fifth mold 50 in the mold opening direction is stopped by the third connecting member 63. Thus, the support portion 13 is accommodated in the second through hole 52 of the fifth mold 50, and the runner 902 is removed from the injection molding mold 100.

[0038] Figure 6 2 is a side view of the surface of the first mold 10 facing the second mold 20. Figure 6 As shown, in the first mold 10, a recess 12 is formed on the surface opposite to the second mold 20. On the surface of the first mold 10 opposite to the fourth mold 40, a groove 14 is formed below the ingrate opening 11 and passes through in the vertical direction downward. The groove 14 is formed below the recess 12. In the present embodiment, the recess 12 and the groove 14 are formed as one body. In addition, the recess 12 and the groove 14 may not be formed as one body.

[0039] Figure 7 It is a side view of the surface of the fifth mold 50 facing the fourth mold 40 . Figure 8 1 is a side view of the first mold 10 and the fifth mold 50 in a state where the fifth mold 50 is arranged in the recessed portion 12 of the first mold 10. The fifth mold 50 is arranged in the recessed portion 12 when the molds are closed.

[0040] Fig. 9: is a side view of the surface of the fifth mold 50 facing the first mold 10. A groove 53 is formed on the surface of the fifth mold 50 facing the first mold 10, which passes through from the first through hole 51 toward the vertical direction downward. The groove 53 has a shape in which the width in the direction perpendicular to the vertical direction and the mold opening direction widens as it tends to the vertical direction downward. Specifically, the width of the groove 53 in the Y direction widens as it tends to the vertical direction downward. Fig. 9 In the example shown, a conical groove 53 is formed on the surface of the fifth mold 50 that is opposite to the first mold 10. In addition, the width of the groove 53 at the lowest end in the vertical direction is smaller than the width of the fifth mold 50 in the direction perpendicular to the vertical direction and the mold opening direction. Specifically, the width of the groove 53 at the lowest end in the vertical direction in the Y direction is smaller than the width of the fifth mold 50 in the Y direction. In addition, the groove 53 has a first portion 54 and a second portion 55. The second portion 55 is a portion located below the first portion 54. As shown in FIG. Figure 3 as well as Figure 4 As shown, the depth of the first portion 54 in the mold opening direction is shallower than the depth of the second portion 55 in the mold opening direction. Specifically, the depth of the first portion 54 in the -X direction is shallower than the depth of the second portion 55 in the -X direction.

[0041] According to the injection molding mold 100 in the first embodiment described above, the groove 14 penetrating downward in the vertical direction is formed on the surface of the first mold 10 facing the fourth mold 40. Therefore, when the injection molding mold 100 is closed, the portion of the first mold 10 where the groove 14 is formed does not contact the fourth mold 40. Fig.10 as well as Fig.11 , an example of a first mold 10a in which the groove 14 is not formed on the surface opposite to the fourth mold 40 is shown. In the case where the groove 14 is not formed on the first mold 10a, when the used molding material or the like is attached to the surface opposite to the fourth mold 40 below the recess 12, the first mold 10a and the fourth mold 40 may not contact each other correctly, resulting in poor molding. In the case where the groove 14 is formed in the first mold 10 as in the present embodiment, the first mold 10 and the fourth mold 40 can be brought into correct contact even if the used molding material or the like is attached to the groove 14. Therefore, the possibility of the used molding material or the like being sandwiched between the two molds can be reduced, thereby reducing the possibility of poor molding.

[0042] Furthermore, in the present embodiment, a groove 53 penetrating downward in the vertical direction is formed on the surface of the fifth mold 50 that faces the first mold 10. Therefore, when the injection molding mold 100 is clamped, the portion of the fifth mold 50 where the groove 53 is formed does not contact the first mold 10. Therefore, even if the used molding material or the like is attached to the groove 53, the first mold 10 and the fifth mold 50 can be brought into correct contact. Therefore, the possibility of the used molding material or the like being sandwiched between the first mold 10 and the fifth mold 50 can be reduced, thereby reducing the possibility of molding defects.

[0043] When the injection molding die 100 is used to mold the product 901, since the molding material passes through the first through hole 51 of the fifth die 50, the used molding material is likely to adhere to the lower part of the first through hole 51. In the present embodiment, a groove 53 is formed on the surface of the fifth die 50 that is opposite to the first die 10, and passes through the first through hole 51 in the vertical direction downward. Therefore, the possibility of the used molding material being sandwiched between the first die 10 and the fifth die 50 can be further reduced.

[0044] When the product 901 is molded using the injection molding mold 100, since the molding material passes through the ingrate opening 11 of the first mold 10, the used molding material is likely to adhere to the lower part of the ingrate opening 11. Fig.10 as well as Fig.11 As shown, when the groove 14 is not formed on the first mold 10a, the used molding material accumulated in the recess 12 becomes easy to be sandwiched between the first mold 10a and the fifth mold 50. In this embodiment, a groove 14 is formed on the surface of the first mold 10 that is opposite to the fourth mold 40, and passes through in the vertical direction downward at a position lower than the inner runner opening 11. Therefore, the possibility of the used molding material being sandwiched between the first mold 10 and the fourth mold 40 can be further reduced. In addition, the used molding material generated between the first mold 10 and the fifth mold 50 becomes easy to fall downward, so that the used molding material can be suppressed from accumulating in the recess 12. As a result, the possibility of the used molding material being sandwiched between the first mold 10 and the fifth mold 50 can be reduced.

[0045] Used molding materials tend to accumulate at the bottom of the mold. In the present embodiment, the groove 53 formed on the surface of the fifth mold 50 opposite to the first mold 10 has a shape in which the width in the direction perpendicular to the vertical direction and the mold opening direction widens as it tends to be downward in the vertical direction. Therefore, the possibility of used molding materials being sandwiched between the first mold 10 and the fifth mold 50 can be further reduced. In addition, compared with the case where the groove 53 is formed as a whole below the first through hole 51 on the surface of the fifth mold 50 opposite to the first mold 10, since the contact area between the first mold 10 and the fifth mold 50 is larger, the area that withstands the pressure applied to the first mold 10 and the fifth mold 50 when the molds are closed can be increased.

[0046] Furthermore, in the present embodiment, the width of the lowest end in the vertical direction of the groove 53 formed on the surface of the fifth mold 50 that faces the first mold 10 is smaller than the width of the fifth mold 50 in the direction perpendicular to the vertical direction and the mold opening direction. Therefore, compared with the case where the width of the lowest end in the vertical direction of the groove 53 is equal to the width of the fifth mold 50 in the direction perpendicular to the vertical direction and the mold opening direction, the area that receives the pressure applied to the first mold 10 and the fifth mold 50 during mold closing can be increased.

[0047] As described above, the used molding material tends to accumulate at the lower part of the mold. In the present embodiment, since the groove 53 formed on the surface of the fifth mold 50 facing the first mold 10 has the first part 54 and the second part 55 located below the first part 54, and the depth of the second part 55 in the mold opening direction is deeper than the depth of the first part 54 in the mold opening direction, the possibility of the used molding material being sandwiched between the first mold 10 and the fifth mold 50 can be further reduced. In addition, the thickness of the fifth mold 50 in the mold opening direction corresponding to the first part 54 can be prevented from becoming too thin.

[0048] B. Second Implementation Method:

[0049] Fig.12 1 is a side view of the surface of the fifth mold 50b in the second embodiment facing the first mold 10. In the second embodiment, the fifth mold 50b further includes a cooling unit 70 and an air vent 80. The structure of each part of the injection molding mold 100b other than the fifth mold 50b is the same as that of the first embodiment.

[0050] The cooling unit 70 cools the fifth mold 50b. In the present embodiment, the cooling unit 70 is a refrigerant flow channel through which a refrigerant flows. The refrigerant is, for example, water. The refrigerant flows in the refrigerant flow channel, thereby cooling the fifth mold 50b. The cooling unit 70 is provided in the fifth mold 50b in such a manner that the cooling capacity for the portion where the groove 53 is formed is higher than the cooling capacity for the portion where the groove 53 is not formed. In the present embodiment, as shown in FIG. Fig.12 As shown, the refrigerant flow paths are denser in the portion where the grooves 53 are formed than in the portion where the grooves 53 are not formed. In addition, the cooling part 70 may be other than the refrigerant flow path as long as it can cool the mold where the grooves are formed.

[0051] The air vent 80 is a hole provided on the surface of the fifth mold 50b facing the other molds. In the present embodiment, the air vent 80 is provided at a portion of the surface of the fifth mold 50b facing the first mold 10 where the groove 53 is not formed. The air vent 80 is connected to the hole 81 provided on the upper surface of the fifth mold 50b. In the state where the injection molding mold 100b is opened, air is supplied from the hole 81 provided on the upper surface of the fifth mold 50b toward the air vent 80, thereby removing the used molding material and the like attached to the surface of the fifth mold 50b facing the first mold 10 and the surface of the first mold 10 facing the fifth mold 50b. In addition, the air vent 80 may also be provided at a portion of the surface of the fifth mold 50b facing the first mold 10 where the groove 53 is formed. In addition, the hole 81 may also be provided not on the upper surface of the fifth mold 50b, but on the bottom surface of the fifth mold 50b or the side surface not facing the other molds.

[0052] According to the injection molding mold 100b in the second embodiment described above, the fifth mold 50b includes a cooling unit 70, and the cooling unit 70 is provided so that the cooling capacity for the portion where the groove 53 is formed is higher than the cooling capacity for the portion where the groove 53 is not formed. The portion where the groove 53 is formed becomes a heat insulating portion where the first mold 10 and the fifth mold 50b do not contact. Therefore, the heat insulating portion can be cooled more than the portion where the first mold 10 and the fifth mold 50b contact.

[0053] In addition, in the present embodiment, the fifth mold 50b is provided with an air supply port 80. By blowing air from the air supply port 80, it becomes easy to remove the used molding material and the like attached to the surface of the fifth mold 50b facing the first mold 10 and the surface of the first mold 10 facing the fifth mold 50b. Therefore, the possibility of the used molding material and the like being sandwiched between the first mold 10 and the fifth mold 50b can be further reduced.

[0054] C. Third Implementation Method:

[0055] Fig.13 This is an explanatory diagram showing the schematic structure of the injection molding system 200 in the third embodiment. The injection molding system 200 includes an injection molding mold 100c, an injection unit 210, a fixing portion 220, a clamping portion 230, and a control portion 240. The injection unit 210, the fixing portion 220, and the clamping portion 230 are fixed to a base 201. The injection unit 210, the fixing portion 220, and the clamping portion 230 are arranged in a horizontal direction. The injection molding mold 100c is mounted on the fixing portion 220. The control portion 240 is accommodated in the base 201. The injection molding system 200 molds a product by injecting a molding material from the injection unit 210 into the injection molding mold 100c mounted on the fixing portion 220.

[0056] Regarding the injection molding mold 100c of this embodiment, the shape of the support portion 13c of the first mold 10c is different from the shape of the support portion 13 of the first embodiment and the second embodiment. The structure of each part of the injection molding mold 100c other than the support portion 13c is the same as the injection molding mold 100 in the first embodiment or the injection molding mold 100b in the second embodiment.

[0057] Fig.14 It is a three-dimensional view of the support portion 13c in the third embodiment. The support portion 13c has a third portion 15 and a fourth portion 16. The third portion 15 is a portion whose cross-sectional area perpendicular to the mold opening direction is a first value. The fourth portion 16 is a portion whose cross-sectional area perpendicular to the mold opening direction is a second value, and the second value is a value smaller than the first value. The third portion 15 is formed on the top end side of the support portion 13c than the fourth portion 16. Specifically, the third portion 15 is formed on the -X direction side than the fourth portion 16. Since the support portion 13c has the third portion 15 and the fourth portion 16, compared with the case where the cross-sectional area of ​​the support portion 13 perpendicular to the mold opening direction is fixed regardless of the position on the support portion 13, it is more difficult for the support portion 13c to detach from the runner 902 when the mold is opened.

[0058] Fig.13 The control unit 240 shown is composed of a computer having one or more processors, a memory, and an input / output interface for inputting and outputting signals with the outside. The control unit 240 executes programs and commands loaded on the main storage device through the processor, thereby performing various functions such as the function of performing the processing of molding the molded product. In addition, the control unit 240 can also be realized by a structure combining multiple circuits for realizing at least part of each function instead of being composed of a computer.

[0059] A hopper 205 for storing materials for the molded product is connected to the injection unit 210. The injection unit 210 plasticizes at least a portion of the material supplied from the hopper 205 to generate a molding material, and injects the molding material into a cavity Cv formed in the injection molding mold 100c. "Plasticization" is a concept that includes melting, and refers to the transformation from a solid to a fluid state. Specifically, in the case of a material that undergoes a glass transition, plasticization refers to a transformation in which the temperature of the material is above the glass transition point. In the case of a material that does not undergo a glass transition, plasticization refers to a transformation in which the temperature of the material is above the melting point. In addition, the supply of material to the injection unit 210 is not limited to the hopper 205, and can also be carried out, for example, via a pipe that pressure-feeds the material.

[0060] A granular material including metal powder and a binder is stored in the hopper 205. As the metal powder, a single metal of magnesium (Mg), iron (Fe), cobalt (Co), chromium (Cr), aluminum (Al), titanium (Ti), copper (Cu), and nickel (Ni) or a powder containing two or more of these metals, or an alloy containing two or more of these metals can be used. Examples of the above-mentioned alloys include maraging steel, cobalt-chromium-molybdenum alloy, titanium alloy, nickel alloy, aluminum alloy, cobalt alloy, cobalt-chromium alloy, etc. The binder includes a resin and a wax. As the resin, an acrylic resin, an epoxy resin, a silicone resin, a cellulose resin or other synthetic resin, or a thermoplastic resin such as PLA (polylactic acid), PA (polyamide), PPS (polyphenylene sulfide), and PEEK (polyetheretherketone) can be used.

[0061] Fig.15 2 is a cross-sectional view showing a schematic structure of the injection unit 210. The injection unit 210 includes a plasticizing section 310, a suction and delivery section 350, and a nozzle 360.

[0062] The plasticizing section 310 plasticizes at least a portion of the material supplied from the hopper 205 to generate a molding material. The plasticizing section 310 includes a flat screw 320, a barrel 330, and a heater 340. The flat screw 320 is housed in a screw housing 311. The flat screw 320 is also called a rotor or simply a screw. The flat screw 320 is driven to rotate in the screw housing 311 around the rotation axis RX by driving the motor 312. In this embodiment, the direction of the rotation axis RX is along the X direction. A connecting hole 331 is formed at the center of the barrel 330. The connecting hole 331 forms at least a portion of a flow channel 370 for the molding material to flow. A syringe 351 described later is connected to the connecting hole 331. In the connecting hole 331, a one-way valve 332 is provided at an upstream portion of the syringe 351. The rotation of the flat screw 320 by the driving motor 312 and the heating by the heater 340 are controlled by the control part 240 .

[0063] Fig.16 The flat screw 320 is a three-dimensional diagram showing the schematic structure of the flat screw 320. The flat screw 320 has a generally cylindrical shape in which the height along the direction of the central axis is smaller than the diameter. A spiral groove 323 centered on the central portion 322 is formed on the groove forming surface 321 of the flat screw 320 that is opposite to the barrel 330. The groove 323 is connected to a material input port 324 formed on the side of the flat screw 320. The material supplied from the hopper 205 is supplied to the groove 323 through the material input port 324. The groove 323 is formed by being separated by the convex strip portion 325. Although in Fig.16 , an example of three grooves 323 is shown, but the number of grooves 323 may be one, or more than two. In addition, the grooves 323 are not limited to the spiral shape, but may be spiral or involute curve, or may be an arc extending from the central portion 322 toward the periphery.

[0064] Fig.17 3 is a schematic plan view of a barrel 330. The barrel 330 has an opposing surface 333 that is opposed to the groove-forming surface 321 of the flat screw 320. A connecting hole 331 is formed at the center of the opposing surface 333. A plurality of guide grooves 334 are formed on the opposing surface 333, which are connected to the connecting hole 331 and extend spirally from the connecting hole 331 toward the periphery. The material supplied to the groove 323 of the flat screw 320 is plasticized between the flat screw 320 and the barrel 330 by the rotation of the flat screw 320 and the heating of the heater 340. At the same time, the material flows along the groove 323 and the guide groove 334 by the rotation of the flat screw 320 and is guided to the central portion 322 of the flat screw 320. The material flowing into the central portion 322 flows out from the connecting hole 331 provided at the center of the barrel 330 to the suction delivery portion 350. In addition, the guide groove 334 may not be provided on the barrel 330. In addition, the guide groove 334 may not be connected to the communication hole 331 .

[0065] like Fig.15As shown, the suction delivery unit 350 includes a syringe 351, a plunger 352, and a plunger driving unit 353. The suction delivery unit 350 has a function of injecting the molding material in the syringe 351 into the cavity Cv of the injection molding mold 100c. The suction delivery unit 350 controls the injection amount, injection speed, and injection pressure of the molding material from the nozzle 360 ​​under the control of the control unit 240. The syringe 351 is a roughly cylindrical component connected to the connecting hole 331 of the barrel 330, and has a plunger 352 inside. The plunger 352 slides inside the syringe 351 and presses the molding material in the syringe 351 to the nozzle 360 ​​provided in the injection unit 210. As a result, the molding material is injected from the nozzle 360 ​​to the injection molding mold 100c. The plunger 352 is driven by the plunger driving unit 353 composed of a motor.

[0066] The nozzle 360 ​​injects the molding material into the injection molding mold 100 c. The nozzle 360 ​​is configured as an open gate type nozzle. The tip of the nozzle 360 ​​is located in the gate opening 11 of the injection molding mold 100 c mounted on the fixing portion 220 .

[0067] Fig.18 This is an explanatory diagram showing the schematic structure of the fixed portion 220 and the clamping portion 230. The fixed portion 220 is configured to be able to install and remove the injection molding mold 100c. The fixed portion 220 includes a fixed plate 221 and a movable plate 222. The fixed plate 221 is fixed to one end of a connecting rod 223 extending in the horizontal direction in a manner that its plate surface is parallel to the vertical direction. The movable plate 222 is arranged opposite to the fixed plate 221 on the -X direction side of the fixed plate 221 in a manner that its plate surface is parallel to the vertical direction. The movable plate 222 is configured to be movable along the direction in which the connecting rod 223 extends. The first mold 10c of the injection molding mold 100c is mounted on the fixed plate 221, and the third mold 30 of the injection molding mold 100c is mounted on the movable plate 222.

[0068] The mold clamping unit 230 opens and closes the injection molding mold 100c mounted on the fixed unit 220. The mold clamping unit 230 drives a motor (not shown) under the control of the control unit 240 to rotate the ball screw 231 and move the movable plate 222 coupled to the ball screw 231 along the connecting rod 223. The movable plate 222 moves along the connecting rod 223, thereby closing and opening the injection molding mold 100c mounted on the fixed unit 220. The movable plate 222 moves in the +X direction, so that the second mold 20 moves in a direction close to the first mold 10c, and the injection molding mold 100c is closed. The movable plate 222 moves in the -X direction, so that the second mold 20 moves in a direction away from the first mold 10c, and the injection molding mold 100c is opened.

[0069] According to the injection molding system 200 in the third embodiment described above, the support portion 13c of the first mold 10c has a third portion 15 whose cross-sectional area perpendicular to the mold opening direction is a first value and a fourth portion 16 whose cross-sectional area perpendicular to the mold opening direction is a second value which is a value smaller than the first value, and the third portion 15 is formed on the top end side of the support portion 13c than the fourth portion 16. Therefore, compared with a case where the cross-sectional area perpendicular to the mold opening direction of the support portion 13 is fixed regardless of the position on the support portion 13, it is more difficult for the support portion 13c to detach from the runner 902 during mold opening, and the molding material is easily scattered when the support portion 13c detaches from the runner 902. In addition, in this embodiment, since the molding material contains metal powder, the metal powder is easily scattered during the molding of the product 901. The molding material and metal powder that are scattered in this way may sometimes adhere to the injection molding mold 100c.

[0070] In this embodiment, similarly to the first embodiment, a groove 14 penetrating downward in the vertical direction is formed on the surface of the first die 10c facing the fourth die 40. Therefore, even if the scattered molding material or metal powder adheres to the groove 14, the first die 10c and the fourth die 40 can be brought into contact with each other accurately. Therefore, the possibility of used molding material being sandwiched between the first die 10c and the fourth die 40 can be reduced, thereby reducing the possibility of molding defects.

[0071] Furthermore, in the present embodiment, a groove 53 penetrating downward in the vertical direction is formed on the surface of the fifth mold 50 that faces the first mold 10c. Therefore, even if the scattered molding material or metal powder adheres to the groove 53, the first mold 10c and the fifth mold 50 can be properly contacted. Therefore, the possibility of used molding material being sandwiched between the first mold 10c and the fifth mold 50 can be reduced, thereby reducing the possibility of molding defects.

[0072] In addition, in the present embodiment, since the nozzle 360 ​​is an open gate type nozzle, even when the injection of the molding material from the nozzle 360 ​​is stopped in the state where the injection molding mold 100c is open, the molding material may sometimes drip from the front end of the nozzle 360 ​​to the injection molding mold 100c. In the present embodiment, a groove 14 penetrating downward in the vertical direction is formed on the surface of the first mold 10c facing the fourth mold 40, and a groove 53 penetrating downward in the vertical direction is formed on the surface of the fifth mold 50 facing the first mold 10c. Therefore, even when the molding material drips from the front end of the nozzle 360 ​​to between the first mold 10c and the fifth mold 50, the dripping molding material is easy to fall below the first mold 10c and the fifth mold 50, and is difficult to accumulate between the first mold 10c and the fifth mold 50. Therefore, the possibility of the molding material dripping from the nozzle 360 ​​being sandwiched between the first mold 10c and the fifth mold 50 can be reduced, and the possibility of molding failure can be reduced.

[0073] D. Fourth Implementation Method:

[0074] Fig.19 4 is an explanatory diagram showing a schematic structure of an injection molding system 400 in a fourth embodiment. The injection molding system 400 includes an injection molding device 410, a base 420, and a storage unit 430. The injection molding device 410 is disposed on the base 420. The storage unit 430 is disposed below the injection molding device 410 and the base 420.

[0075] The injection molding device 410 includes an injection molding mold 100, an injection unit 210, a fixing portion 220, a clamping portion 230, and a control portion 240 (not shown). The structure of the injection molding mold 100 in the fourth embodiment is the same as the injection molding mold 100 in the first embodiment. In addition, the structure of the injection molding mold 100 in the fourth embodiment may be the same as the injection molding mold 100b in the second embodiment or the injection molding mold 100c in the third embodiment. The structures of the injection unit 210, the fixing portion 220, the clamping portion 230, and the control portion 240 are the same as those in the third embodiment. In addition, in the present embodiment, the nozzle 360 ​​provided in the injection unit 210 may be a valve gate instead of an open gate type.

[0076] A discard hole 421 is formed on the base 420 at a position corresponding to the groove 14 formed on the first mold 10 of the injection molding mold 100 mounted on the injection molding device 410 and the groove 53 formed on the fifth mold 50. The discard hole 421 is a hole that passes through the base 420 in the vertical direction. The discard hole 421 is formed on the base 420 so as to lead to the storage portion 430.

[0077] The storage section 430 stores the discarded molding material. The storage section 430 is a box-shaped structure with an opening at the top, and is arranged below the discard hole 421. In the storage section 430, the used molding material generated between the first mold 10 and the fifth mold 50, the molding material hanging from the front end of the nozzle 360, etc. are stored. In addition, the storage section 430 can be a magnetic pad, a magnetic sheet, etc., or a suction pump, etc. In addition, the discard hole 421 can be not formed on the base 420, and the storage section 430 can be arranged on the base 420.

[0078] According to the injection molding system 400 in the fourth embodiment described above, a discard hole 421 is formed on the base 420 below the groove 14 and the groove 53 formed on the injection molding mold 100, and a storage portion 430 is arranged below the discard hole 421. Therefore, the molding material falling downward from the groove 14 or the groove 53 can be easily recovered.

[0079] E. Other implementation methods:

[0080] (E-1) In the above-mentioned embodiment, a groove 14 penetrating downward in the vertical direction is formed on the surface of the first mold 10 that is opposite to the fourth mold 40. In addition, a groove 53 penetrating downward in the vertical direction is formed on the surface of the fifth mold 50 that is opposite to the first mold 10. In contrast, it is sufficient that a groove penetrating downward in the vertical direction is formed on at least any one of the following opposing surfaces, that is, at least any one of the opposing surfaces between the third mold 30 and the fourth mold 40, at least any one of the opposing surfaces between the fourth mold 40 and the fifth mold 50, at least any one of the opposing surfaces between the fifth mold 50 and the first mold 10, and at least any one of the opposing surfaces between the fourth mold 40 and the first mold 10.

[0081] (E-2) In the above embodiment, the groove 53 penetrating from the first through hole 51 toward the vertical downward direction is formed on the surface of the fifth mold 50 facing the first mold 10. In contrast, it is also possible that, in addition to the groove 53, a groove penetrating from the first through hole 51 toward the vertical upward direction is formed on the surface of the fifth mold 50 facing the first mold 10 in a manner symmetrical to the groove 53 with respect to the first through hole 51.

[0082] (E-3) In the above embodiment, the groove 53 formed in the fifth mold 50 has a shape in which the width in the direction perpendicular to the vertical direction and the mold opening direction becomes wider as it goes downward in the vertical direction. In contrast, the groove 53 may be configured so that the width in the direction perpendicular to the vertical direction and the mold opening direction does not change as it goes downward in the vertical direction.

[0083] (E-4) In the above embodiment, the width of the groove 53 at the bottom end in the vertical direction is smaller than the width of the fifth mold 50 in the direction perpendicular to the vertical direction and the mold opening direction. In contrast, the width of the groove 53 at the bottom end in the vertical direction may be equal to the width of the fifth mold 50 in the direction perpendicular to the vertical direction and the mold opening direction.

[0084] (E-5) In the above embodiment, the groove 53 includes the first portion 54 and the second portion 55, and the depth of the first portion 54 in the mold opening direction is shallower than the depth of the second portion 55 in the mold opening direction. In contrast, the depth of the first portion 54 in the mold opening direction and the depth of the second portion 55 in the mold opening direction may be equal. That is, the depth of the groove 53 in the mold opening direction may be fixed regardless of the position.

[0085] (E-6) In the above embodiment, the groove 53 has a shape in which the width in the direction perpendicular to the vertical direction and the mold opening direction becomes wider as it goes downward in the vertical direction. In addition, the width of the groove 53 at the lowest end in the vertical direction is smaller than the width of the fifth mold 50 in the direction perpendicular to the vertical direction and the mold opening direction. In addition, the groove 53 has a first portion 54 and a second portion 55, and the depth of the first portion 54 in the mold opening direction is shallower than the depth of the second portion 55 in the mold opening direction. In contrast, it is not limited to the groove 53, and the groove formed on the surface of the first mold 10 facing the fifth mold 50, the surface of the first mold 10 facing the fourth mold 40, the surface of the fourth mold 40 facing the first mold 10, the surface of the third mold 30 facing the fourth mold 40, the surface of the fourth mold 40 facing the third mold 30, the surface of the fourth mold 40 facing the fifth mold 50, or the surface of the fifth mold 50 facing the fourth mold 40 may have the above characteristics.

[0086] (E-7) In the first embodiment, the cross-sectional area of ​​the support portion 13 perpendicular to the mold opening direction is constant regardless of the position on the support portion 13. In contrast, the support portion 13 in the first embodiment may have the same structure as the support portion 13c in the third embodiment.

[0087] (E-8) In the second embodiment, the cooling unit 70 is provided on the fifth mold 50. In contrast, the cooling unit 70 is not limited to being provided on the fifth mold 50, and may be provided on a mold having a groove penetrating downward in the vertical direction.

[0088] F. Other methods:

[0089] The present disclosure is not limited to the above-mentioned embodiments, and can be implemented in various ways without departing from the scope of the present disclosure. For example, the present disclosure can also be implemented in the following ways. In order to solve part or all of the problems of the present disclosure, or to achieve part or all of the effects of the present disclosure, the technical features in the above-mentioned embodiments corresponding to the technical features in the various methods described below can be appropriately replaced or combined. In addition, if the technical feature is not described as a necessary technical feature in this specification, it can be appropriately deleted.

[0090] (1) According to one embodiment of the present disclosure, a mold for injection molding is provided. The mold for injection molding has a plurality of molds and forms a cavity that defines the shape of a product, and the mold for injection molding includes: a first mold that forms an ingrate opening for a molding material to flow in; a second mold that moves in a direction away from the first mold and in a direction perpendicular to a vertical direction, i.e., a mold opening direction, by mold opening, and the second mold includes: a third mold; a fourth mold that is disposed between the third mold and the first mold in the mold opening direction; a fifth mold that is disposed between the fourth mold and the first mold in the mold opening direction, and the cavity is formed by the third mold and the fourth mold, and the fourth mold includes a channel for the molding material to pass from the ingrate opening toward the cavity, and the fifth mold includes a channel for the molding material to pass from the ingrate toward the channel. The first mold has a recessed portion on a surface opposite to the second mold through the first through hole, and the fifth mold is arranged in the recessed portion when the molds are closed. Through the mold opening, a space is formed between the third mold and the fourth mold, between the fourth mold and the fifth mold, between the fifth mold and the first mold, and between the fourth mold and the first mold in the mold opening direction, and a groove penetrating downward in the vertical direction is formed on at least any one of the opposing surfaces of at least one of the third mold and the fourth mold, at least any one of the opposing surfaces of at least one of the fourth mold and the fifth mold, at least any one of the opposing surfaces of at least one of the fifth mold and the first mold, and at least any one of the opposing surfaces of at least one of the fourth mold and the first mold.

[0091] According to this mode, even if the used molding material is attached to the groove, the mold having the groove and the mold having the surface opposite to the surface having the groove can be correctly contacted. Therefore, the possibility of the used molding material being sandwiched between the two molds can be reduced, thereby reducing the possibility of molding defects.

[0092] (2) In the above aspect, the groove penetrating from the first through hole toward a vertically downward direction may be formed on the surface of the fifth die facing the first die.

[0093] According to this aspect, the first mold and the fifth mold can be brought into contact with each other accurately. Therefore, the possibility of used molding material being sandwiched between the first mold and the fifth mold can be reduced, thereby reducing the possibility of molding defects.

[0094] (3) In the above aspect, the groove penetrating in a vertically downward direction may be formed on a surface of the first mold that faces the fourth mold below the opening of the ingates.

[0095] According to this aspect, the first mold and the fourth mold can be brought into contact with each other accurately, so that the possibility of used molding material being sandwiched between the first mold and the fourth mold can be reduced, thereby reducing the possibility of molding defects.

[0096] (4) In the above aspect, the groove may have a shape in which the width in a direction perpendicular to the vertical direction and the mold opening direction becomes wider as it goes downward in the vertical direction.

[0097] According to such an aspect, it is possible to increase the area that receives the pressure applied between the mold having the groove formed therein and the mold having the surface facing the surface having the groove formed therein when the injection molding mold is clamped.

[0098] (5) In the above aspect, the width of the groove at the lowest end in the vertical direction may be smaller than the width of the mold in which the groove is formed in a direction perpendicular to the vertical direction and the mold opening direction.

[0099] According to this method, when the mold for injection molding is closed, the area that withstands the pressure applied between the mold having the groove and the mold having a surface opposite to the surface having the groove can be increased compared to the case where the width of the lowest end of the groove in the vertical direction is equal to the width of the mold having the groove in the direction perpendicular to the vertical direction and the mold opening direction.

[0100] (6) In the above aspect, the groove may include a first portion and a second portion located below the first portion, and a depth of the first portion in the mold opening direction may be shallower than a depth of the second portion in the mold opening direction.

[0101] Used molding materials and the like tend to accumulate under the mold. According to this aspect, since the depth of the second portion in the mold opening direction is deeper than the depth of the first portion in the mold opening direction, the possibility of used molding materials and the like being sandwiched between the two molds can be further reduced. In addition, the thickness of the mold corresponding to the first portion in the mold opening direction can be prevented from becoming too thin.

[0102] (7) In the above aspect, the mold having the groove formed therein may include a cooling unit for cooling the mold having the groove formed therein, and the cooling capacity of the cooling unit for the portion having the groove formed therein may be higher than the cooling capacity of the cooling unit for the portion not having the groove formed therein.

[0103] According to such an aspect, the portion where the groove is formed can be cooled more than the portion where the groove is not formed.

[0104] (8) In the above method, it can also be set that at least one of the opposing surfaces between the third mold and the fourth mold, at least one of the opposing surfaces between the fourth mold and the fifth mold, at least one of the opposing surfaces between the fifth mold and the first mold, and at least one of the opposing surfaces between the fourth mold and the first mold has an air supply port.

[0105] According to this mode, by blowing air from the air outlet, it is easy to remove the used molding material adhering to the facing surface of the third mold and the fourth mold, the facing surface of the fourth mold and the fifth mold, the facing surface of the fifth mold and the first mold, or the facing surface of the fourth mold and the first mold. Therefore, the possibility of the used molding material being sandwiched between the two molds can be reduced.

[0106] (9) According to one embodiment of the present disclosure, an injection molding system is provided. The injection molding system comprises the above-described injection molding mold and an open gate nozzle for injecting the molding material, wherein the molding material includes metal powder, the fifth mold comprises a second through hole connected to the channel, the first mold comprises a support portion, the support portion is inserted into the second through hole and supports the molding material filled in the channel, the support portion comprises a third portion having a first value of cross-sectional area perpendicular to the mold opening direction and a fourth portion having a second value of cross-sectional area smaller than the first value, and the third portion is formed on the tip side of the fourth portion.

[0107] According to this mode, even if the used molding material, scattered metal powder, etc. are attached to the groove, the mold having the groove and the mold having the surface opposite to the surface having the groove can be correctly contacted. In addition, even if the molding material falls from the nozzle to the injection molding mold, the falling molding material is unlikely to accumulate between the mold having the groove and the mold having the surface opposite to the surface having the groove. Therefore, the possibility of the used molding material being sandwiched between the two molds can be reduced, thereby reducing the possibility of poor molding.

[0108] (10) According to one embodiment of the present disclosure, an injection molding system is provided. The injection molding system comprises: an injection molding device, which comprises the injection molding mold of the embodiment and a nozzle for injecting the molding material; a base for installing the injection molding device; a storage portion, which is arranged below the base and stores the discarded molding material, and a discard hole leading to the storage portion is formed on the base at a position corresponding to the bottom of the groove.

[0109] According to such an aspect, the used molding material and the like dropped from the trough can be easily collected.

[0110] Explanation of symbols

[0111] 10, 10a, 10c…first mold; 11…ingate opening; 12…recess; 13, 13c…supporting portion; 14…groove; 15…third portion; 16…fourth portion; 20…second mold; 30…third mold; 35…ejector pin; 40…fourth mold; 41…channel; 50, 50b…fifth mold; 51…first through hole; 52…second through hole; 53…groove; 54…first portion; 55…second portion; 61…first connecting member; 62…second connecting member; 63…third connecting member; 70…cooling portion; 80…air outlet; 81…hole; 100, 100b, 100c…mold for injection molding; 200…injection molding system; 201…base; 205…hopper; 210…injection unit; 220…fixing portion; 221…fixing plate; 222…movable plate; 223 …connecting rod; 230…mold clamping part; 231…ball screw; 240…control part; 310…plasticizing part; 311…screw housing; 312…driving motor; 320…flat screw; 321…groove forming surface; 322…central part; 323…groove; 324…material inlet; 325…convex strip; 330…barrel; 331…connecting hole; 332…check valve; 333…opposing surface; 334… Guide groove; 335…central portion; 340…heater; 350…suction and delivery portion; 351…syringe cylinder; 352…plunger; 353…plunger driving portion; 360…nozzle; 370…runner; 400…injection molding system; 410…injection molding device; 420…base; 421…waste hole; 430…storage portion; 901…product; 902…cross runner; Cv…cavity; RX…rotating axis.

Claims

1. A mold for injection molding, comprising a plurality of molds and a cavity defining a shape of a product, The injection molding mold comprises: A first mold is formed with an ingate opening for the molding material to flow in; The second mold moves in a direction away from the first mold and perpendicular to the vertical direction, that is, in a mold opening direction, by mold opening. The second mold comprises: The third mold; a fourth mold, which is arranged between the third mold and the first mold in the mold opening direction; A fifth mold is arranged between the fourth mold and the first mold in the mold opening direction, The cavity is formed by the third mold and the fourth mold, The fourth mold includes a passage for the molding material to pass from the ingate opening toward the cavity. The fifth mold includes a first through hole extending from the ingate opening toward the channel for allowing the molding material to pass through. The first mold has a recessed portion on a surface facing the second mold. The fifth mold is arranged in the concave portion during mold closing. By the mold opening, a space is formed between the third mold and the fourth mold, between the fourth mold and the fifth mold, between the fifth mold and the first mold, and between the fourth mold and the first mold in the mold opening direction. A groove extending downward in a vertical direction is formed on at least any one of the opposing surfaces between the third mold and the fourth mold, at least any one of the opposing surfaces between the fourth mold and the fifth mold, at least any one of the opposing surfaces between the fifth mold and the first mold, and at least any one of the opposing surfaces between the fourth mold and the first mold.

2. The injection molding mold according to claim 1, wherein: The groove penetrating from the first through hole toward vertically downward is formed on the surface of the fifth die facing the first die.

3. The injection molding mold according to claim 2, wherein: The groove penetrating downward in the vertical direction is formed on the surface of the first mold that faces the fourth mold at a position below the ingate opening.

4. The injection molding mold according to claim 1, wherein: The groove has a shape in which the width in the direction perpendicular to the vertical direction and the mold opening direction becomes wider as it goes downward in the vertical direction.

5. The injection molding mold according to claim 4, wherein: The width of the groove at the lowest end in the vertical direction is smaller than the width of the mold in which the groove is formed in a direction perpendicular to the vertical direction and the mold opening direction.

6. The injection molding mold according to claim 4, wherein: The groove has a first portion and a second portion located below the first portion. A depth of the first portion in the mold opening direction is shallower than a depth of the second portion in the mold opening direction.

7. The injection molding mold according to claim 1, wherein: The mold having the groove formed therein includes a cooling unit for cooling the mold having the groove formed therein. The cooling capacity of the cooling unit for the portion where the groove is formed is higher than the cooling capacity of the cooling unit for the portion where the groove is not formed.

8. The injection molding mold according to claim 1, wherein: There is an air supply port on at least any one of the opposing surfaces between the third mold and the fourth mold, at least any one of the opposing surfaces between the fourth mold and the fifth mold, at least any one of the opposing surfaces between the fifth mold and the first mold, and at least any one of the opposing surfaces between the fourth mold and the first mold.

9. An injection molding system comprising the injection molding mold according to claim 1 and an open gate nozzle for injecting the molding material, The molding material comprises metal powder, The fifth mold has a second through hole communicating with the channel, The first mold includes a support portion, the support portion is inserted into the second through hole and supports the molding material filled in the channel. The support portion includes a third portion having a first value of a cross-sectional area perpendicular to the mold opening direction and a fourth portion having a second value of the cross-sectional area smaller than the first value, and the third portion is formed on the tip side of the fourth portion.

10. An injection molding system comprising: An injection molding device comprising the injection molding mold according to claim 1 and a nozzle for injecting the molding material; A base, which is used to set the injection molding device; A storage portion is disposed below the base and stores the discarded molding material. A discard hole leading to the storage portion is formed on the base at a position corresponding to the lower side of the groove.

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