Injection molding apparatus

Abstract

The injection molding device provided by the present application can realize a simplified injection molding device, which comprises a first fixed mold dismounting part, a second fixed mold dismounting part, a first movable mold dismounting part, a first injection unit, a second injection unit, and a position changing part. The first fixed mold dismounting part can dismount the first fixed mold. The second fixed mold dismounting part can dismount the second fixed mold. The first movable mold dismounting part can dismount the first movable mold. The first injection unit injects a first molding material through a first gate opening of the first fixed mold. The second injection unit injects a second molding material through a second gate opening of the second fixed mold. The position changing part changes the position of the first movable mold dismounting part so that the first movable mold is located at a position opposite to the first fixed mold or the second fixed mold. The position changing part comprises a driving part, a rotating shaft part that rotates by the driving part, and a rotating disc connected with the rotating shaft part and provided with the first movable mold dismounting part. The rotating disc rotates around the rotating shaft of the rotating shaft part. A flow path for the medium to flow through the first movable mold is formed in the rotating shaft part.

Description

Technical Field

[0001] This invention relates to injection molding apparatus. Background Technology

[0002] An injection molding apparatus is known as follows: material plasticized by a plasticizing device is supplied to a cavity formed by a pair of molds and injected from a nozzle.

[0003] For example, Patent Document 1 describes a rotary injection molding machine comprising three injection units, three fixed molds, and three movable molds. In the rotary injection molding machine described in Patent Document 1, each movable mold is rotatably mounted on a rotary mounting plate and closes with each fixed mold, and a three-color molded article is formed by injecting molding material from the injection units.

[0004] Patent Document 1: Japanese Utility Model Publication No. 2-23390

[0005] In injection molding machines like those described above, it is sometimes necessary to cool the movable mold in order to cool the cavity after injection. However, in injection molding machines like those in Patent Document 1 that mold multi-color molded articles, since the movable mold rotates, the bending of the hose becomes complicated, for example, when water is circulated through the movable mold for cooling, thus making the device complex. Summary of the Invention

[0006] One aspect of the injection molding apparatus involved in this invention includes:

[0007] The first fixed mold assembly / disassembly part is capable of assembling and disassembling the first fixed mold;

[0008] The second fixed mold assembly / disassembly section is capable of assembling and disassembling the second fixed mold;

[0009] The first movable mold assembly / disassembly part is capable of assembling and disassembling the first movable mold, wherein the first movable mold is configured to be able to be assembled with the first fixed mold and the second fixed mold respectively;

[0010] The first injection unit injects the first molding material through the first gate opening of the first fixed mold;

[0011] The second injection unit injects the second molding material through the second gate opening of the second fixed mold; and

[0012] The position changing unit changes the position of the first movable mold assembly / disassembly unit so that the first movable mold is positioned opposite the first fixed mold or the second fixed mold.

[0013] The position changing unit has:

[0014] Drive unit;

[0015] The rotating shaft component rotates via the drive unit; and

[0016] A rotating disk is connected to the rotating shaft component and is provided with the first movable mold disassembly / reassembly part.

[0017] The rotating disk rotates around the rotation axis of the rotating shaft component.

[0018] A flow path for the medium to flow is formed in the rotating shaft component, which passes through the first movable mold. Attached Figure Description

[0019] Figure 1 This is a schematic perspective view of the injection molding apparatus according to this embodiment.

[0020] Figure 2 This is a schematic cross-sectional view of the injection molding apparatus according to this embodiment.

[0021] Figure 3 This is a schematic cross-sectional view of the first injection unit of the injection molding apparatus according to this embodiment.

[0022] Figure 4 This is a perspective view schematically showing the flat screw of the injection molding apparatus according to this embodiment.

[0023] Figure 5 This is a schematic diagram showing the rollers of the injection molding apparatus according to this embodiment.

[0024] Figure 6 This is a perspective view schematically showing the fixed mold unit of the injection molding apparatus according to this embodiment.

[0025] Figure 7 This is a perspective view schematically showing the movable mold unit of the injection molding apparatus according to this embodiment.

[0026] Figure 8 This is a perspective view schematically showing the movable mold unit of the injection molding apparatus according to this embodiment.

[0027] Figure 9 This is a flowchart illustrating the molded product generation process of the control unit of the injection molding apparatus according to this embodiment.

[0028] Figure 10 This is a schematic cross-sectional view of the rotating shaft component of the injection molding apparatus according to this embodiment.

[0029] Figure 11 This is a schematic diagram showing the rotating shaft component of the injection molding apparatus according to this embodiment.

[0030] Figure 12 This is a diagram illustrating the first mold flow path and the second mold flow path of the injection molding apparatus according to this embodiment.

[0031] Figure 13 This is a schematic cross-sectional view of the first injection unit of the injection molding apparatus according to a variation of this embodiment.

[0032] Explanation of reference numerals in the attached figures

[0033] 10…First injection unit, 12…Second injection unit, 20…Fixed mold unit, 30…Modible mold unit, 40…Mold closing section, 42…Mold closing platen, 44…Mold drive section, 46…Ball screw section, 48…Shim, 50…Control section, 60…Support platform, 62…Support rod, 64…Connecting rod, 66…Support rod, 100…Injection molding device, 110…Material supply section, 120…Plasticizing section, 122…Screw housing, 124…Screw drive section, 126…Shaft, 130…Flat screw, 130a…First part, 130b…Second part, 131…Main surface 132…groove forming surface, 133…side surface, 133a…first side surface, 133b…second side surface, 134…first groove, 135…central part, 136…connecting part, 137…material inlet, 140…roller, 142…opposing surface, 144…second groove, 146…connecting hole, 160…injection part, 162…cylinder, 164…plunger, 166…plunger drive part, 168…nozzle, 169…nozzle orifice, 200…injection molding device, 210…fixed plate, 220…first fixed mold assembly / disassembly part, 221…clamping part, 222…second fixed mold assembly / disassembly part 223…Clamping part, 230…First fixed mold, 230a…Nozzle insertion hole, 230b…First gate opening, 232…Second fixed mold, 232b…Second gate opening, 310…Modible plate, 312…Through hole, 320…First movable mold assembly / disassembly part, 321…Clamping part, 322…Second movable mold assembly / disassembly part, 323…Clamping part, 330…First movable mold, 332…Second movable mold, 340…Position changing part, 341…Belt, 342…Drive part, 343…Pulley, 344…Rotating shaft component, 346…Rotating disk, 348…Ejection structure, 349 …through hole, 350…frame, 402…side, 404…bottom, 410…flow path, 411…first axial flow path, 411a…medium inlet, 412…second axial flow path, 412a…medium outlet, 414…first mold flow path, 416…second mold flow path, 420…inflow channel, 422…outflow channel, 430…inflow pipe, 432…outflow pipe, 434…first connecting pipe, 436…second connecting pipe, 438…third connecting pipe, 441…first packing, 442…second packing, 443…third packing, 444…fourth packing, 445…fifth packing. Detailed Implementation

[0034] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the embodiments described below are not intended to unduly limit the scope of the invention as defined in the claims. Furthermore, not all of the components described below are necessarily essential elements of the present invention.

[0035] 1. Injection molding device

[0036] 1.1. Overall Composition

[0037] First, the injection molding apparatus according to this embodiment will be described with reference to the accompanying drawings. Figure 1 This is a schematic perspective view of the injection molding apparatus 100 according to this embodiment. Figure 2 This is a schematic cross-sectional view of the injection molding apparatus 100 according to this embodiment. It should be noted that... Figure 1 and Figure 2 In the diagram, the X-axis, Y-axis, and Z-axis are shown as three mutually orthogonal axes. The X-axis and Y-axis directions are, for example, horizontal. The Z-axis direction is, for example, vertical.

[0038] like Figure 1 and Figure 2 As shown, the injection molding apparatus 100 includes, for example, a first injection unit 10, a second injection unit 12, a fixed mold unit 20, a movable mold unit 30, a mold closing section 40, and a control section 50. It should be noted that, for ease of explanation, in... Figure 2 The first injection unit 10 is shown in a simplified form.

[0039] The injection molding apparatus 100 performs multi-color molding by sequentially injecting multiple molding materials to form molded articles. In the illustrated example, the injection molding apparatus 100 has two injection units 10 and 12, which use two different molding materials to perform multi-color molding. Multi-color molding is not limited to injection molding using molding materials of different colors, but also includes injection molding using molding materials of different kinds.

[0040] Specifically, firstly, a first molding material is injected from the first injection unit 10 into a cavity formed by the fixed mold unit 20 and the movable mold unit 30. Next, a second molding material is injected from the second injection unit 12 into the first molding material disposed within the cavity. Thus, a molded article composed of the first molding material and the second molding material can be manufactured.

[0041] The components of the injection molding apparatus 100 will now be described.

[0042] 1.2. Injection Unit

[0043] Figure 3 This is a schematic cross-sectional view of the first injection unit 10. (As shown) Figures 1-3 As shown, the first injection unit 10 includes, for example, a material supply section 110, a plasticizing section 120, and an injection section 160.

[0044] The material supply unit 110 supplies materials as raw materials to the plasticizing unit 120. The material supply unit 110 is, for example, composed of a hopper. Granular or powdered materials are supplied to the material supply unit 110.

[0045] The plasticizing section 120 is configured to plasticize the material supplied by the material supply section 110, generating a first molding material with a flowable paste-like consistency, and guiding it to the injection section 160. For example... Figure 3 As shown, the plasticizing section 120 includes, for example, a spiral housing 122, a spiral drive section 124, a flat screw 130, a roller 140, and a heating section 150.

[0046] It should be noted that plasticization includes the concept of melting, referring to the change from a solid to a fluid state. Specifically, in the case of materials undergoing a glass transition, plasticization refers to raising the material's temperature above the glass transition point. In the case of materials not undergoing a glass transition, plasticization refers to raising the material's temperature above its melting point.

[0047] The helical housing 122 is a frame that houses the flat screw 130. The flat screw 130 is housed within the space enclosed by the helical housing 122 and the roller 140.

[0048] A screw drive unit 124 is disposed in the screw housing 122. The screw drive unit 124 is, for example, constituted by a motor. The screw drive unit 124 rotates the flat screw 130. A shaft 126 connected to the screw drive unit 124 is connected to the flat screw 130. The screw drive unit 124 is controlled by the control unit 50. It should be noted that, although not shown, the shaft 126 and the flat screw 130 can also be connected by a speed reducer.

[0049] The flat screw 130 has a generally cylindrical shape, with its magnitude in the direction of the rotation axis R being smaller than the magnitude of the direction orthogonal to the rotation axis R. In the illustrated example, the rotation axis R is parallel to the Y-axis. The flat screw 130 rotates about the rotation axis R using the torque generated by the screw drive unit 124. The flat screw 130 has a main surface 131, a groove forming surface 132 opposite to the main surface 131, and a side surface 133 connecting the main surface 131 and the groove forming surface 132. Here, Figure 4 This is a schematic perspective view of the flat screw 130.

[0050] like Figure 4As shown, a first groove 134 is formed on the groove forming surface 132 of the flat screw 130. The first groove 134 has, for example, a central portion 135, a connecting portion 136, and a material inlet 137. The central portion 135 is opposite to a connecting hole 146 formed in the roller 140. The central portion 135 communicates with the connecting hole 146. The connecting portion 136 connects the central portion 135 and the material inlet 137. In the illustrated example, the connecting portion 136 is formed in a spiral shape from the central portion 135 toward the outer periphery of the groove forming surface 132. The material inlet 137 is formed on the outer periphery of the groove forming surface 132. That is, the material inlet 137 is formed on the side surface 133 of the flat screw 130. The material supplied by the material supply unit 110 is introduced into the first groove 134 from the material inlet 137, passes through the connecting portion 136 and the central portion 135, and is conveyed to the connecting hole 146 formed in the roller 140. In the example shown, two first slots 134 are formed.

[0051] It should be noted that there is no particular limitation on the number of the first slot 134. Although there is no illustration, the first slot 134 can be formed in more than three forms, or it can be formed in only one form.

[0052] like Figure 3 As shown, the roller 140 is positioned opposite the flat screw 130. The roller 140 has a facing surface 142 that faces the groove forming surface 132 of the flat screw 130. A connecting hole 146 is formed at the center of the facing surface 142. Here, Figure 5 This is a schematic diagram showing the roller 140.

[0053] like Figure 5 As shown, a second groove 144 and a connecting hole 146 are formed on the opposing surface 142 of the roller 140. Multiple second grooves 144 are formed. In the illustrated example, six second grooves 144 are formed; however, the number is not particularly limited. When viewed from the Y-axis direction, multiple second grooves 144 are formed around the connecting hole 146. One end of each second groove 144 connects to the connecting hole 146 and extends spirally from the connecting hole 146 toward the outer periphery of the opposing surface 142. The second groove 144 functions to guide the plasticized first molding material toward the connecting hole 146.

[0054] It should be noted that the shape of the second groove 144 is not particularly limited, and it can also be straight. Furthermore, one end of the second groove 144 may not be connected to the connecting hole 146. Also, the second groove 144 may not be formed on the opposing surface 142. However, if efficient guidance of the first molding material to the connecting hole 146 is desired, it is preferable that the second groove 144 is formed on the opposing surface 142.

[0055] like Figure 3As shown, a heating unit 150 is disposed on the roller 140. The heating unit 150 heats the material supplied between the flat screw 130 and the roller 140. The output of the heating unit 150 is controlled by the control unit 50. The plasticizing unit 120 conveys and heats the supplied material to the connecting hole 146 through the flat screw 130, the roller 140, and the heating unit 150 to generate a plasticized first molding material, which then flows out from the connecting hole 146 to the injection unit 160.

[0056] The injection unit 160 injects the first molding material generated by the plasticizing unit 120 into the movable mold unit 30. The injection unit 160 includes, for example, a cylinder 162, a plunger 164, a plunger drive unit 166, and a nozzle 168. The cylinder 162 is a generally cylindrical component connected to the connecting hole 146. The plunger 164 moves inside the cylinder 162. The plunger 164 is driven by the plunger drive unit 166, which consists of a motor, gears, etc. The plunger drive unit 166 is controlled by the control unit 50.

[0057] The injection unit 160 performs metering and injection operations by sliding the plunger 164 within the cylinder 162. The metering operation involves guiding the first molding material located in the connecting hole 146 into the cylinder 162 by moving the plunger 164 away from the +X axis, and metering it within the cylinder 162. The injection operation involves injecting the first molding material within the cylinder 162 into the movable mold unit 30 through the nozzle 168 by moving the plunger 164 towards the connecting hole 146 along the -X axis.

[0058] Nozzle 168 injects the first molding material into movable mold unit 30. A nozzle insertion hole 230a for inserting the nozzle 168 and a first gate opening 230b through which the first molding material injected from the nozzle 168 passes are formed in the first fixed mold 230 mounted on the fixed mold unit 20. A nozzle hole 169 communicating with the connecting hole 146 is formed on the nozzle 168. By performing the above-described metering and injection operations, the first molding material metered in cylinder 162 is conveyed to the nozzle hole 169 via the connecting hole 146. Furthermore, nozzle 168 injects the first molding material from the nozzle hole 169 through the first gate opening 230b. It should be noted that, for ease of explanation, in Figure 3 The illustration of the fixed module unit 20 has been simplified or omitted.

[0059] The material supply section 110 of the second injection unit 12 supplies a material different from the material supply section 110 of the first injection unit 10. The second injection unit 12 injects a second molding material different from the first molding material through the second gate opening 232b of the second fixed mold 232. The second injection unit 12 has a configuration that is substantially the same as that of the first injection unit 10. Therefore, its detailed description is omitted.

[0060] 1.3. Fixed Module Unit

[0061] Figure 6 This is a schematic perspective view of the fixed module unit 20. (Example) Figure 2 and Figure 6 As shown, the fixed mold unit 20 includes, for example, a fixed plate 210, a first fixed mold assembly / disassembly part 220, a second fixed mold assembly / disassembly part 222, and a force-applying component 240. It should be noted that, for ease of explanation, in... Figure 2 The illustrations of the first fixed mold 230 and the second fixed mold 232 are omitted in the text. Furthermore, for ease of explanation, in... Figure 6 The diagram of the force-applying component 240 is omitted in the text.

[0062] The fixing plate 210 has a generally plate-like shape. For example... Figure 2 As shown, the fixing plate 210 is fixed to the support platform 60 by the support rod 62. In the illustrated example, the first injection unit 10 and the second injection unit 12 are connected to the surface of the fixing plate 210 facing the -Y axis direction.

[0063] The first fixed mold assembly / disassembly part 220 and the second fixed mold assembly / disassembly part 222 are provided on the fixed plate 210. In the illustrated example, the fixed mold assembly / disassembly parts 220 and 222 are provided on the surface of the fixed plate 210 facing the +Y axis direction. The fixed mold assembly / disassembly parts 220 and 222 are arranged, for example, in the X-axis direction.

[0064] The first fixed mold assembly / disassembly section 220 is configured to allow for the assembly / disassembly of the first fixed mold 230. Figure 6 In the illustrated example, the first fixed mold assembly / disassembly unit 220 has a pair of clamping portions 221, which clamp the first fixed mold 230 to hold it in place. The second fixed mold assembly / disassembly unit 222 is configured to assemble and disassemble the second fixed mold 232. In the illustrated example, the second fixed mold assembly / disassembly unit 222 has a pair of clamping portions 223, which clamp the second fixed mold 232 to hold it in place.

[0065] The first fixed mold 230 is held by the first fixed mold disassembly part 220. A first gate opening 230b for injecting the first molding material is formed on the surface of the first fixed mold 230 facing the +Y axis direction. Furthermore, a recess (not shown) constituting a cavity is formed on the surface of the first fixed mold 230 facing the +Y axis direction.

[0066] The second fixed mold 232 is held by the second fixed mold disassembly part 222. A second gate opening 232b for injecting the second molding material is formed on the surface of the second fixed mold 232 facing the +Y axis direction. Furthermore, a recess (not shown) constituting a cavity is formed on the surface of the second fixed mold 232 facing the +Y axis direction. The materials of the fixed molds 230 and 232 are, for example, metal, ceramic, or resin.

[0067] like Figure 2 As shown, the force-applying component 240 is disposed on the fixed plate 210. When opening the mold after mold closing, the force-applying component 240 applies force to the rotating disk 346 of the movable mold unit 30 against the movable plate 310. In the illustrated example, when the movable mold unit 30 moves in the +Y axis direction after mold closing, the force-applying component 240 applies force to the rotating disk 346 against the movable plate 310. The force-applying component 240 is made of an elastic body. The force-applying component 240 can prevent the rotating disk 346 from remaining in the fixed mold unit 20 during mold opening.

[0068] It should be noted that "mold closing" refers to moving the movable mold unit 30 towards the fixed mold unit 20 so that the first fixed mold 230 comes into contact with the first movable mold 330 or the second movable mold 332. Furthermore, "mold opening" refers to moving the movable mold unit 30 away from the fixed mold unit 20 so that the first fixed mold 230 separates from the first movable mold 330 or the second movable mold 332.

[0069] 1.4. Movable module unit

[0070] Figure 7 This is a schematic perspective view of the movable module unit 30. (Example) Figure 2 and Figure 7 As shown, the movable mold unit 30 includes a movable plate 310, a first movable mold assembly / disassembly part 320, a second movable mold assembly / disassembly part 322, and a position changing part 340. It should be noted that, for ease of explanation, in... Figure 2 The illustrations of the first movable module 330 and the second movable module 332 are omitted in the text.

[0071] The movable plate 310 has a generally plate-like shape. For example... Figure 7 As shown, through holes 312 are formed at the four corners of the movable plate 310. Figure 1As shown, the connecting rod 64 passes through the through hole 312. The connecting rod 64 is connected to the fixed mold unit 20 and the mold closing part 40. The movable plate 310 can move in the Y-axis direction through the mold closing part 40.

[0072] A first movable mold assembly / disassembly part 320 and a second movable mold assembly / disassembly part 322 are provided on the rotary disk 346 of the position changing part 340. The first movable mold assembly / disassembly part 320 is configured to assemble and disassemble the first movable mold 330. Figure 7 In the illustrated example, the first movable mold assembly / disassembly part 320 has a pair of clamping parts 321, which clamp the first fixed mold 230 to hold it in place. The second movable mold assembly / disassembly part 322 is configured to assemble and disassemble the second movable mold 332. In the illustrated example, the second movable mold assembly / disassembly part 322 has a pair of clamping parts 323, which clamp the second movable mold 332 to hold it in place.

[0073] The first movable mold 330 is held by the first movable mold assembly / disassembly part 320. A recess (not shown) constituting a cavity is formed on the surface of the first movable mold 330 facing the -Y axis direction. The first movable mold 330 is configured to be able to engage with each of the first fixed mold 230 and the second fixed mold 232. That is, a cavity can be formed by the recesses formed in the first movable mold 330 and the first fixed mold 230, and a cavity can also be formed by the recesses formed in the first movable mold 330 and the second fixed mold 232.

[0074] The second movable mold 332 is held by the second movable mold assembly / disassembly part 322. A recess (not shown) forming a cavity is formed on the surface of the second movable mold 332 facing the -Y axis direction. The second movable mold 332 is configured to be able to engage with each of the first fixed mold 230 and the second fixed mold 232. That is, the cavity can be formed by the recesses formed in the second movable mold 332 and the first fixed mold 230, and the cavity can also be formed by the recesses formed in the second movable mold 332 and the second fixed mold 232. The movable molds 330 and 332 are made of materials such as metal, ceramic, or resin.

[0075] The position changing unit 340 is connected to the movable plate 310. The position changing unit 340 includes, for example, a drive unit 342, a rotating shaft component 344, a rotating disk 346, and a push-out structure 348. It should be noted that, for ease of explanation, in... Figure 2 The illustration of the derived structure 348 is omitted in the text.

[0076] The drive unit 342 rotates the rotating shaft component 344. The drive unit 342 is, for example, a motor. Figure 2In the example shown, the torque generated by the drive unit 342 is transmitted to the rotating shaft component 344 via the belt 341 and pulley 343.

[0077] The rotating shaft component 344 rotates via the drive unit 342. Here, Figure 8 This is a schematic perspective view showing the rotating shaft component 344 and the rotating disk 346. (See diagram below.) Figure 8 As shown, the rotating shaft component 344 is generally cylindrical in shape. The rotating shaft component 344 rotates about the rotating shaft Q. In the illustrated example, the direction of the rotating shaft Q is the Y-axis direction. Figure 2 As shown, the rotating shaft component 344 is held in place of the movable plate 310 in a manner that allows it to rotate via the pulley 343. It should be noted that the internal structure of the rotating shaft component 344 will be described later.

[0078] The rotating disk 346 is connected to the rotating shaft component 344. The rotating disk 346 is generally disc-shaped. As the rotating shaft component 344 rotates, the rotating disk 346 rotates about the rotation axis Q of the rotating shaft component 344. A first movable mold assembly / disassembly part 320 and a second movable mold assembly / disassembly part 322 are provided in the rotating disk 346. In the illustrated example, the movable mold assembly / disassembly parts 320 and 322 are located on the surface of the rotating disk 346 facing the -Y axis direction.

[0079] By rotating the rotary disk 346, the position changing unit 340 changes the position of the first movable mold assembly / disassembly unit 320 so that the first movable mold 330 is positioned opposite the first fixed mold 230 or the second fixed mold 232. Furthermore, the position changing unit 340 changes the position of the second movable mold assembly / disassembly unit 322 so that the second movable mold 332 is positioned opposite the first fixed mold 230 or the second fixed mold 232. Specifically, when the first movable mold 330 is positioned opposite the first fixed mold 230, the position changing unit 340 positions the second movable mold 332 opposite the second fixed mold 232; when the first movable mold 330 is positioned opposite the second fixed mold 232, the position changing unit 340 positions the second movable mold 332 opposite the first fixed mold 230.

[0080] like Figure 7 As shown, an ejection structure 348 is provided on the movable plate 310. The ejection structure 348 is a structure for removing a molded article formed by sequentially injecting a first molding material and a second molding material from the first movable mold 330 or the second movable mold 332. In the illustrated example, the ejection structure 348 is a pin that can move in the Y-axis direction via a drive unit (not shown). Through holes 349 are formed in the movable molds 330 and 332 through which the ejection structure 348 passes.

[0081] The ejection structure 348 is positioned opposite the second fixed mold 232. No ejection structure is provided opposite the first fixed mold 230. After the second molding material is injected through the second gate opening 232b of the second fixed mold 232, the ejection structure 348 moves along the -Y axis through the through hole 349, ejecting the molded product remaining in either the first movable mold 330 or the second movable mold 332.

[0082] 1.5. Mold closing section

[0083] The mold clamping part 40 causes the movable mold unit 30, which has a rotating shaft component 344 and a rotating disk 346, to move forward and backward in the injection direction. The drive unit 342 moves in conjunction with the rotating disk 346. The mold clamping part 40 moves the drive unit 342 in conjunction with the rotating shaft component 344. The injection direction is the direction from which the first molding material is injected from the first injection unit 10; in the illustrated example, this is the Y-axis direction. Figure 2 As shown, the mold closing part 40 includes, for example, a mold closing plate 42, a mold driving part 44, and a ball screw part 46.

[0084] The template 42 is fixed to the support platform 60 by the support rod 66. The template 42 is a generally plate-shaped component.

[0085] The mold drive unit 44 is connected to the mold assembly platen 42. The mold drive unit 44 is composed of, for example, a motor, gears, etc. The mold drive unit 44 is connected to the movable mold unit 30 via a ball screw unit 46. The drive of the mold drive unit 44 is controlled by the control unit 50. The ball screw unit 46 transmits the power generated by the drive of the mold drive unit 44 to the movable mold unit 30. The ball screw unit 46 can move relative to the mold assembly platen 42 in the Y-axis direction. The mold assembly unit 40 moves the movable mold unit 30 via the mold drive unit 44 and the ball screw unit 46, thereby performing mold closing and mold opening.

[0086] The output of the mold drive unit 44 is greater than the output of the plunger drive unit 166. Therefore, the mold closing unit 40 can reliably close the mold. If the output of the plunger drive unit 166 is greater than the output of the mold drive unit 44, there is a possibility that molding material may leak from the cavity. The output of the mold drive unit 44 is, for example, greater than the output of the screw drive unit 124.

[0087] It should be noted that the output of the spiral drive unit 124 of the first injection unit 10 and the output of the spiral drive unit 124 of the second injection unit 12 may be the same or different. Furthermore, the output of the plunger drive unit 166 of the first injection unit 10 and the output of the plunger drive unit 166 of the second injection unit 12 may be the same or different.

[0088] The ball screw portion 46 is connected to the frame 350 of the movable mold unit 30 via a shim 48. The ball screw portion 46, the shim 48, and the frame 350 do not rotate based on the drive of the drive unit 342 of the movable mold unit 30. A gap may be provided between the ball screw portion 46 and the rotating shaft component 344. A gap may also be provided between the frame 350 and the pulley 343. The frame 350 houses a portion of the rotating shaft component 344.

[0089] 1.6. Control Department

[0090] The control unit 50 is configured, for example, as a computer, which has a processor, main memory, and an input / output interface for inputting and outputting signals to and from the outside. The control unit 50 performs various functions, for example, by executing a program read from the main memory via the processor. Specifically, the control unit 50 controls the injection units 10 and 12, the movable mold unit 30, and the mold closing unit 40. It should be noted that the control unit 50 may also not be configured as a computer, but rather as a combination of multiple circuits. Here, Figure 9 This is a flowchart used to explain the processing of the control unit 50.

[0091] The user, for example, operates an operation unit (not shown) to output a processing start signal to the control unit 50 to begin processing. The operation unit is implemented, for example, by a mouse, keyboard, touch panel, etc. When the control unit 50 receives the processing start signal, it begins the molding process.

[0092] First, such as Figure 9 As shown, in step S1, the control unit 50 controls the mold closing unit 40 and the position changing unit 340 to bring the fixed molds 230 and 232 and the movable molds 330 and 332 to their initial positions (step S1). In the initial positions, the fixed molds 230 and 232 are separated from the movable molds 330 and 332, forming an open mold state. Furthermore, in the initial positions, the first fixed mold 230 is opposite the first movable mold 330, and the second fixed mold 232 is opposite the second movable mold 332.

[0093] Next, as step S2, the control unit 50 controls the mold closing unit 40 to move the movable molds 330 and 332 in the -Y axis direction, so that the first fixed mold 230 abuts against the first movable mold 330 and the second fixed mold 232 abuts against the second movable mold 332 to perform mold closing.

[0094] Next, as step S3, the control unit 50 controls the injection units 10 and 12 to inject the first molding material and the second molding material. Specifically, the control unit 50 controls the first injection unit 10 to inject the first molding material into the cavity formed by the first fixed mold 230 and the first movable mold 330. Moreover, the control unit 50 controls the second injection unit 12 to inject the second molding material into the cavity formed by the second fixed mold 232 and the second movable mold 332.

[0095] Next, as step S4, the control unit 50 controls the mold closing unit 40 to move the movable molds 330 and 332 in the +Y axis direction to open the mold. Simultaneously with mold opening, the control unit 50 controls the ejection structure 348 to eject the semi-finished product remaining in the second movable mold 332 and remove it from the second movable mold 332. This semi-finished product is only composed of the second molding material and is not a finished product. After ejecting the semi-finished product, the control unit 50 returns the ejection structure 348 to its initial position. A semi-finished product composed of the first molding material, which is a finished product, remains in the first movable mold 330.

[0096] Next, as step S5, the control unit 50 controls the position changing unit 340 to rotate the rotating disk 346, so that the first fixed mold 230 is positioned opposite the second movable mold 332, and the second fixed mold 232 is positioned opposite the first movable mold 330. For example, the control unit 50 controls the position changing unit 340 to rotate the rotating disk 346 180° around the rotation axis Q.

[0097] Next, as step S6, the control unit 50 controls the mold closing unit 40 to move the movable molds 330 and 332 in the -Y axis direction, so that the first fixed mold 230 abuts against the second movable mold 332, and the second fixed mold 232 abuts against the first movable mold 330, to perform mold closing.

[0098] Next, as step S7, the control unit 50 controls the injection units 10 and 12 to inject the first molding material and the second molding material. Specifically, the control unit 50 controls the first injection unit 10 to inject the first molding material into the cavity formed by the first fixed mold 230 and the second movable mold 332. Furthermore, the control unit 50 controls the second injection unit 12 to inject the second molding material into the cavity formed by the second fixed mold 232 and the first movable mold 330. A semi-finished product made of the first molding material injected in step S3 remains in the first movable mold 330. By injecting the second molding material into this semi-finished product, a molded article made of the first molding material and the second molding material can be formed.

[0099] Next, as step S8, the control unit 50 controls the mold closing unit 40 to move the movable molds 330 and 332 in the +Y axis direction to open the mold. While opening the mold, the control unit 50 controls the ejection structure 348 to eject the molded part remaining in the second movable mold 332 and remove it from the second movable mold 332.

[0100] Next, as step S9, the control unit 50 determines whether to end the molding process. For example, the control unit 50 determines whether a predetermined time has elapsed since the molding process started. If it is determined that the predetermined time has elapsed ("Yes" in step S9), the control unit 50 ends the molding process. If it is determined that the predetermined time has not elapsed ("No" in step S9), the control unit 50 returns the process to step S1.

[0101] Alternatively, as step S9, the control unit 50 determines whether the number of times the ejection structure 348 has been operated is greater than a predetermined number. If it is determined to be greater than the predetermined number (if "yes" in step S9), the control unit 50 ends the molding process. If it is determined not to be greater than the predetermined number (if "no" in step S9), the control unit 50 returns the process to step S1.

[0102] It should be noted that when the process returns to step S1, in the second and subsequent steps S3, the control unit 50 controls the second injection unit 12 to inject the second molding material into the semi-finished product made of the first molding material. Therefore, in the second and subsequent steps S4, the control unit 50 controls the ejection structure 348 to eject the molded product remaining in the second movable mold 332.

[0103] If the possibility of wasting the second molding material is taken into consideration, it is preferable not to inject the second molding material from the second injection unit 12 in the first step S3. However, if the program of the control unit 50 is to be simplified, it is preferable to inject the second molding material from the second injection unit 12 in the first step S3.

[0104] 1.7. Rotating Shaft Components

[0105] like Figure 2 As shown, a flow path 410 is formed in the rotating shaft component 344, passing through the first movable mold 330 and the second movable mold 332. The flow path 410 is configured to include a first axial flow path 411 and a second axial flow path 412. The first axial flow path 411 and the second axial flow path 412 are separate from each other. The axial flow paths 411 and 412 are formed from the side surface 402 of the rotating shaft component 344 to the bottom surface 404. In the illustrated example, the bottom surface 404 is the surface of the rotating shaft component 344 facing the -Y axis direction. A medium for cooling the movable molds 330 and 332 flows through the axial flow paths 411 and 412. Water can be an example of such a medium.

[0106] An inflow groove 420 and an outflow groove 422 are formed on the side surface 402 of the rotating shaft component 344. Here, Figure 10 This is a schematic cross-sectional view showing the vicinity of the inflow groove 420 and outflow groove 422 of the rotating shaft component 344. Figure 11 The diagram schematically shows the area near the inflow groove 420 and outflow groove 422 of the rotating shaft component 344.

[0107] like Figure 10 and Figure 11 As shown, the inflow channel 420 and the outflow channel 422 are separate from each other. The inflow channel 420 and the outflow channel 422 surround the side surface 402. In other words, the inflow channel 420 and the outflow channel 422 are formed on the side surface 402 in a manner that covers 360°.

[0108] The inflow channel 420 is connected to the medium inlet 411a of the first axial flow path 411. The medium inlet 411a is formed on the bottom surface of the inflow channel 420. The shape of the medium inlet 411a is, for example, circular. The outflow channel 422 is connected to the medium outlet 412a of the second axial flow path 412. The medium outlet 412a is formed on the bottom surface of the outflow channel 422. The shape of the medium outlet 412a is, for example, circular. The medium inlet 411a and the medium outlet 412a face opposite directions to each other.

[0109] like Figure 10 As shown, the inflow channel 420 is connected to the inflow pipe 430. The inflow pipe 430 passes through the frame 350. The inflow pipe 430 is connected to a pump (not shown), for example, to circulate the medium. The outflow channel 422 is connected to the outflow pipe 432. The outflow pipe 432 passes through the frame 350. The inflow pipe 430 and the outflow pipe 432 do not rotate with the rotation of the rotating shaft component 344. It should be noted that, for ease of explanation, in Figure 2 The diagrams of the inflow pipe 430 and the outflow pipe 432 are omitted. Furthermore, in... Figure 11 The diagrams of frame 350, inlet pipe 430, and outlet pipe 432 are omitted.

[0110] like Figure 10 and Figure 11As shown, packing materials 441, 442, 443, 444, and 445 are provided on the side 402 of the rotating shaft component 344. An inflow channel 420 is provided between the first packing material 441 and the second packing material 442. An outflow channel 422 is provided between the second packing material 442 and the third packing material 443. O-rings are used, for example, as packing materials 441, 442, and 443. Using packing materials 441 and 442 reduces the possibility of leakage of the medium flowing in the inflow channel 420 to the outside. Using packing materials 442 and 443 reduces the possibility of leakage of the medium flowing in the outflow channel 422 to the outside. A fourth packing material 444 is provided in the +Y axis direction of the first packing material 441. A fifth packing material 445 is provided in the -Y axis direction of the third packing material 443. Using packing materials 444 and 445 further reduces the possibility of medium leakage to the outside. The fillers 441, 442, 443, 444, and 445 rotate, for example, while abutting against the frame 350, as the rotating shaft component 344 rotates.

[0111] here, Figure 12 This is a diagram used to illustrate the first mold flow path 414 formed in the first movable mold 330 and the second mold flow path 416 formed in the second movable mold 332.

[0112] like Figure 12 As shown, when viewed from the Y-axis direction, the first mold flow path 414 is formed along the outer periphery of the first movable mold 330. The first mold flow path 414 is connected to the first axial flow path 411 via a first connecting pipe 434. When viewed from the Y-axis direction, the second mold flow path 416 is formed along the outer periphery of the second movable mold 332. The second mold flow path 416 is connected to the first mold flow path 414 via a second connecting pipe 436. Furthermore, the second mold flow path 416 is connected to the second axial flow path 412 via a third connecting pipe 438.

[0113] The medium passes sequentially through the rotating shaft component 344, the first movable mold 330, and the second movable mold 332, returning to the rotating shaft component 344. In the illustrated example, the medium passes sequentially through the inflow pipe 430, the inflow channel 420, the first axial flow path 411, the first connecting pipe 434, the first mold flow path 414, the second connecting pipe 436, the second mold flow path 416, the third connecting pipe 438, the second axial flow path 412, the outflow channel 422, and the outflow pipe 432. The first axial flow path 411, the first connecting pipe 434, the first mold flow path 414, the second connecting pipe 436, the second mold flow path 416, the third connecting pipe 438, and the second axial flow path 412 constitute the flow path 410. The medium flowing out of the outflow pipe 432 can either be cooled by a cooling structure (not shown) and returned to the inflow pipe 430, or it can be directly discarded. During the molding process in the control unit 50, the medium flows in the first axial flow path 411, etc.

[0114] It should be noted that, although not illustrated, flow paths for media flow are formed in the first fixed mold 230 and the second fixed mold 232. The flow paths formed in the first fixed mold 230 and the second fixed mold 232 are interconnected. The media flowing in the movable molds 330 and 332 are not discharged through the fixed molds 230 and 232.

[0115] 1.8. Effect

[0116] In the injection molding apparatus 100, the position changing unit 340 includes a drive unit 342, a rotating shaft member 344 that rotates via the drive unit 342, and a rotating disk 34 connected to the rotating shaft member 344 and provided with a first movable mold assembly / disassembly unit 320. The rotating disk 346 rotates about the rotating shaft member 344's rotation axis Q. A flow path 410 for the medium flowing through the first movable mold 330 is formed in the rotating shaft member 344. Therefore, in the injection molding apparatus 100, for example, compared to when a flexible tube for the medium flow is directly connected to the movable mold instead of having a flow path formed in the rotating shaft member, the apparatus can be simplified. For example, when the flexible tube is directly connected to the movable mold, the tube rotates with the rotation of the rotating shaft member, thus making the tube winding complex and the apparatus complicated. In addition, leakage may sometimes occur.

[0117] In the injection molding apparatus 100, an inflow groove 420 connected to and surrounding the medium inlet 411a of the flow path 410 is formed on the side 402 of the rotating shaft member 344, and an outflow groove 422 connected to and surrounding the side 402 of the flow path 410 is formed. The inflow groove 420 and the outflow groove 422 are separate from each other. Therefore, in the injection molding apparatus 100, the medium can flow into the flow path 410 without rotating the inflow pipe 430 with the rotation of the rotating shaft member 344, and the inflow pipe 430 allows the medium to flow into the inflow groove 420. Moreover, in the injection molding apparatus 100, the medium can flow out from the outflow groove 422 without rotating the outflow pipe 432 with the rotation of the rotating shaft member 344. This simplifies the apparatus.

[0118] The injection molding apparatus 100 includes a mold clamping section 40 that moves the rotating shaft member 344 forward and backward in the injection direction. The mold clamping section 40 is linked to the rotating shaft member 344 to move the drive unit 342. Therefore, in the injection molding apparatus 100, compared to when the mold clamping section is not linked to the rotating shaft member and the drive unit is not moved, the structure for transmitting the torque generated in the drive unit 342 to the rotating shaft member 344 can be simplified.

[0119] The injection molding apparatus 100 includes an ejection structure 348 located opposite the second fixed mold 232, but no ejection structure is provided at the location opposite the first fixed mold 230. Therefore, the injection molding apparatus 100 can be simplified compared to when an ejection structure is provided at the location opposite the first fixed mold 230.

[0120] It should be noted that, although not illustrated, ejection structures 348 can be provided at two locations: one opposite the first fixed mold 230 and the other opposite the second fixed mold 232. Furthermore, in the example described above, the ejection structure 348 was driven in conjunction with the movement of the movable molds 330 and 332 in the +Y axis direction. However, the ejection structure 348 can also be driven without being linked to the movement of the movable molds 330 and 332.

[0121] The injection molding apparatus 100 includes a second movable mold assembly / disassembly unit 322, which is detachable and configured to engage with the first fixed mold 230 and the second fixed mold 232 respectively. When the first movable mold 330 is positioned opposite the first fixed mold 230, a position changing unit 340 positions the second movable mold 332 opposite the second fixed mold 232. When the first movable mold 330 is positioned opposite the second fixed mold 232, the position changing unit 340 positions the second movable mold 332 opposite the first fixed mold 230. Therefore, in the injection molding apparatus 100, when a second molding material is injected from the second injection unit 12 into the first movable mold 330 via the second gate opening 232b of the second fixed mold 232, a first molding material can be injected from the first injection unit 10 into the second movable mold 332 via the first gate opening 230b of the first fixed mold 230. This can improve productivity in producing molded articles composed of a first molding material and a second molding material.

[0122] In the injection molding apparatus 100, the medium passes sequentially through the rotating shaft component 344, the first movable mold 330, and the second movable mold 332, and returns to the rotating shaft component 344. Therefore, in the injection molding apparatus 100, the two movable molds 330 and 332 can be cooled by a continuous flow path.

[0123] 1.9 The materials supplied

[0124] Materials supplied by the Materials Supply Department 110 include various materials that use thermoplastic materials, metallic materials, ceramic materials, etc., as the main material. Here, "main material" refers to the material that forms the core of the molded article's shape, and means a material that accounts for 50% or more by mass in the molded article. Among the aforementioned materials are materials in which these main materials are melted in monomer form, and materials in which a portion of the components contained together with the main materials are melted into a paste.

[0125] As a thermoplastic material, thermoplastic resins can be used, for example. Examples of thermoplastic resins include: acrylonitrile-butadiene-styrene (ABS) resin, polypropylene (PP), polyethylene (PE), polyacetal (POM), polyvinyl chloride (PVC), polyamide (PA), polylactic acid (PLA), polyphenylene sulfide (PPS), polycarbonate (PC), modified polyphenylene ether, polybutylene terephthalate, polyethylene terephthalate, and other general engineering plastics; and polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, polyimide, polyamide-imide, polyetherimide, polyetheretherketone (PEEK), and other engineering plastics.

[0126] Pigments, metals, ceramics, and other additives such as paraffin wax, flame retardants, antioxidants, and heat stabilizers can also be incorporated into thermoplastic materials. The thermoplastic material is plasticized and transformed into a molten state in the plasticizing section 120 by the rotation of the flat screw 130 and the heating section 150. Furthermore, the first forming material and the second molding material thus generated solidify due to the decrease in temperature after injection from the nozzle 168. Preferably, the thermoplastic material is injected from the nozzle 168 while heated above its glass transition point and completely molten.

[0127] In the plasticizing section 120, for example, a metal material may be used as the main material to replace the aforementioned thermoplastic material. In this case, it is preferable to mix the components molten during the generation of the first forming material and the second molding material into a powder material in which the metal material is powdered, and then add it to the plasticizing section 120.

[0128] As metallic materials, examples include single metals such as magnesium (Mg), iron (Fe), cobalt (Co), chromium (Cr), aluminum (Al), titanium (Ti), copper (Cu), and nickel (Ni), or alloys containing one or more of these metals, or maraging steel, stainless steel, cobalt-chromium-molybdenum alloys, titanium alloys, nickel alloys, aluminum alloys, cobalt alloys, and cobalt-chromium alloys.

[0129] In the plasticizing section 120, ceramic materials can be used as the main material to replace the aforementioned metal materials. Examples of ceramic materials include oxide ceramics such as silicon dioxide, titanium dioxide, alumina, and zirconium oxide, and non-oxide ceramics such as aluminum nitride.

[0130] The metal and ceramic powder materials supplied by the material supply unit 110 can also be mixtures of powders of various single metals, alloys, and ceramic materials. Furthermore, the metal and ceramic powder materials can be coated with, for example, the aforementioned thermoplastic resin or other thermoplastic resins. In this case, the thermoplastic resin can also melt and become fluid in the plasticizing unit 120.

[0131] In the powder materials of metal and ceramic materials supplied by Materials Supply Department 110, solvents may be added, for example. Examples of solvents include: water; (poly)alkylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, and propylene glycol monoethyl ether; acetates such as ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, and isobutyl acetate; aromatic hydrocarbons such as benzene, toluene, and xylene; ketones such as methyl ethyl ketone, acetone, methyl isobutyl ketone, ethyl-n-butyl ketone, diisopropyl ketone, and acetylacetone; alcohols such as ethanol, propanol, and butanol; tetraalkylammonium acetates; sulfoxide solvents such as dimethyl sulfoxide and diethyl sulfoxide; pyridine, γ-methylpyridine, and 2... , Pyridine solvents such as 6-dimethylpyridine; tetraalkylammonium acetate (e.g., tetrabutylammonium acetate); ionic liquids such as butylcarbidol acetate.

[0132] In addition, adhesives may be added to the powdered metal and ceramic materials supplied by the material supply unit 110. Examples of adhesives include acrylic resin, epoxy resin, silicone resin, cellulose resin, or other synthetic resins, or PLA, PA, PPS, PEEK, or other thermoplastic resins.

[0133] 2. Examples of variations in injection molding apparatus

[0134] Next, the injection molding apparatus according to a modified example of this embodiment will be described with reference to the accompanying drawings. Figure 13 This is a schematic cross-sectional view of the injection molding apparatus 200 according to a modified example of this embodiment. Hereinafter, the same reference numerals will be used to mark the components of the injection molding apparatus 200 according to the first modified example of this embodiment that have the same functions as the constituent components of the injection molding apparatus 100 according to this embodiment described above, and their detailed descriptions will be omitted.

[0135] like Figure 13 As shown, the flat screw 130 in the injection molding apparatus 200 has a first side 133a and a second side 133b, which is different from the injection molding apparatus 100 described above.

[0136] The flat screw 130 has, for example, a first portion 130a and a second portion 130b. The first portion 130a is located closer to the roller 140 than the second portion 130b. The first portion 130a is positioned between the roller 140 and the second portion 130b. For example, when viewed from the Y-axis direction, the first portion 130a is circular in shape. When viewed from the Y-axis direction, the center C1 of the first portion 130a is located on the rotation axis R. The first portion 130a has a groove forming surface 132 and a first side surface 133a intersecting the groove forming surface 132. In the illustrated example, the first side surface 133a is orthogonal to the groove forming surface 132. A material inlet 137 of a first groove 134 is formed on the first side surface 133a.

[0137] The second part 130b is located on the side of the first part 130a opposite to the roller 140. In the illustrated example, the second part 130b is located in the Y-axis direction relative to the first part 130a. The second part 130b is connected to the shaft 126. The second part 130b is connected to the first part 130a. For example, when viewed from the Y-axis direction, the shape of the second part 130b is circular. When viewed from the Y-axis direction, the center C2 of the second part 130b is located on the rotation axis R.

[0138] The second part 130b has a second side 133b. The second side 133b is farther from the roller 140 than the first side 133a. The distance between the second side 133b and the roller 140 is greater than the distance between the first side 133a and the roller 140.

[0139] When viewed from the Y-axis, the diameter D2 of the second part 130b is larger than the diameter D1 of the first part 130a. The distance L2 between the second side 133b and the spiral housing 122 is smaller than the distance L1 between the first side 133a and the spiral housing 122. Distance L1 is the shortest distance between the first side 133a and the spiral housing 122. Distance L2 is the shortest distance between the second side 133b and the spiral housing 122.

[0140] The first molding material injected by the first injection unit 10 is an elastomeric resin. Examples of elastomeric resins include polyurethane resin and silicone resin. The second molding material injected by the second injection unit 12 is a non-elastomeric resin. Examples of the second molding material are ABS resin, etc.

[0141] When the first molding material is an elastomeric resin and the second molding material is a non-elastomeric resin, the distance L2 between the second side 133b in the first injection unit 10 and the spiral housing 122 is less than the distance L2 between the second side 133b in the second injection unit 12 and the spiral housing 122.

[0142] Compared to non-elastomeric resins such as ABS resin, elastomeric resins are highly elastic and extensible, and lightweight. Therefore, when elastomeric resin penetrates between the flat screw and the screw housing, it is difficult to remove the infiltrated resin, and sometimes the resin can even reach the shaft, causing the flat screw to stop rotating.

[0143] To address the aforementioned issues, in the injection molding apparatus 200, the distance L2 between the second side 133b of the first injection unit 10 that processes the elastomeric resin and the spiral housing 122 is made smaller than the distance L2 between the second side 133b of the second injection unit 12 that does not process the elastomeric resin and the spiral housing 122. This reduces the likelihood of elastomeric resin intruding between the second portion 130b and the spiral housing 122.

[0144] It should be noted that the injection molding apparatus 200 can also be configured to allow for the assembly and disassembly of injection units 10 and 12 depending on the supplied material. Furthermore, the first injection unit 10 may inject a thermosetting resin, and the second injection unit 12 may inject a thermoplastic resin.

[0145] The above-described embodiments and modifications are examples and are not intended to limit the scope. For instance, the various embodiments and modifications can be appropriately combined.

[0146] This invention includes configurations that are substantially the same as those described in the embodiments, for example, configurations with the same function, method, and result, or configurations with the same purpose and effect. Furthermore, this invention includes configurations that replace non-essential parts of the configurations described in the embodiments. Furthermore, this invention includes configurations that achieve the same effect or purpose as the configurations described in the embodiments. Furthermore, this invention includes configurations that incorporate known techniques into the configurations described in the embodiments.

[0147] The following content can be derived from the above implementation method.

[0148] One method of injection molding apparatus includes:

[0149] The first fixed mold assembly / disassembly part is capable of assembling and disassembling the first fixed mold;

[0150] The second fixed mold assembly / disassembly section is capable of assembling and disassembling the second fixed mold;

[0151] The first movable mold assembly / disassembly part is capable of assembling and disassembling the first movable mold, wherein the first movable mold is configured to be able to be assembled with the first fixed mold and the second fixed mold respectively;

[0152] The first injection unit injects the first molding material through the first gate opening of the first fixed mold;

[0153] The second injection unit injects the second molding material through the second gate opening of the second fixed mold; and

[0154] The position changing unit changes the position of the first movable mold assembly / disassembly unit so that the first movable mold is positioned opposite the first fixed mold or the second fixed mold.

[0155] The position changing unit has:

[0156] Drive unit;

[0157] The rotating shaft component rotates via the drive unit; and

[0158] A rotating disk is connected to the rotating shaft component and is provided with the first movable mold disassembly / reassembly part.

[0159] The rotating disk rotates around the rotation axis of the rotating shaft component.

[0160] A flow path for the medium to flow is formed in the rotating shaft component, which passes through the first movable mold.

[0161] The injection molding apparatus can be simplified.

[0162] Alternatively, in one configuration of the injection molding apparatus,

[0163] On the side surface of the rotating shaft component, there is formed:

[0164] An inflow groove connected to the medium inlet of the flow path and surrounding the side; and

[0165] An outflow groove connected to the medium outlet of the flow path and surrounding the side surface.

[0166] The inflow channel and the outflow channel are separate from each other.

[0167] According to this injection molding apparatus, the medium can flow into the flow path without rotating the inlet pipe along with the rotating shaft component, and the inlet pipe allows the medium to flow into the inlet tank. Furthermore, the medium can flow out of the outlet tank without rotating the outlet pipe along with the rotating shaft component, and the outlet pipe allows the medium to flow out of the outlet tank.

[0168] Alternatively, one embodiment of the injection molding apparatus may include:

[0169] The mold closing section allows the rotating shaft component to move forward and backward in the injection direction.

[0170] The mold closing part is linked with the rotating shaft component to move the drive part.

[0171] According to this injection molding apparatus, the structure for transmitting torque generated in the drive unit to the rotating shaft component can be simplified.

[0172] Alternatively, one embodiment of the injection molding apparatus may include:

[0173] The ejection structure is positioned opposite the second fixed mold.

[0174] No ejection structure is provided at the position opposite to the first fixed mold.

[0175] The injection molding apparatus can be simplified.

[0176] Alternatively, one embodiment of the injection molding apparatus may include:

[0177] The second movable mold assembly / disassembly part is capable of assembling and disassembling the second movable mold. The second movable mold is configured to be able to be assembled and disassembled with both the first fixed mold and the second fixed mold.

[0178] The position change unit

[0179] When the first movable mold is positioned opposite the first fixed mold, the second movable mold is positioned opposite the second fixed mold.

[0180] When the first movable mold is positioned opposite the second fixed mold, the second movable mold is positioned opposite the first fixed mold.

[0181] According to this injection molding apparatus, the productivity of producing molded articles composed of a first molding material and a second molding material can be improved.

[0182] Alternatively, in one configuration of the injection molding apparatus,

[0183] The medium passes sequentially through the rotating shaft component, the first movable mold, and the second movable mold to return to the rotating shaft component.

[0184] According to this injection molding apparatus, two movable molds can be cooled through a continuous flow path.

[0185] Alternatively, in one configuration of the injection molding apparatus,

[0186] The first injection unit and the second injection unit have a plasticizing section for plasticizing the supplied material.

[0187] The plasticizing part has:

[0188] A flat screw with a grooved surface;

[0189] A roller having opposing surfaces facing the groove and having a communicating hole; and

[0190] Housing that houses the flat screw.

[0191] The flat screw has:

[0192] A first side surface intersects with the groove and has an inlet for introducing the material; and

[0193] The second side is further away from the roller than the first side.

[0194] The distance between the second side and the housing is less than the distance between the first side and the housing.

[0195] According to this injection molding apparatus, the possibility of the first molding material intruding between the second side and the shell can be reduced.

[0196] Alternatively, in one configuration of the injection molding apparatus,

[0197] The first molding material is an elastomer resin.

[0198] The second molding material is a non-elastomeric resin.

[0199] The distance between the second side of the first injection unit and the housing is less than the distance between the second side of the second injection unit and the housing.

[0200] According to this injection molding apparatus, the possibility of the first molding material, which is an elastomeric resin, intruding between the second side and the shell can be reduced.

Claims

1. An injection molding apparatus characterized by comprising: include: The first fixed mold assembly / disassembly part is capable of assembling and disassembling the first fixed mold; The second fixed mold assembly / disassembly section is capable of assembling and disassembling the second fixed mold; The first movable mold assembly / disassembly part is capable of assembling and disassembling the first movable mold, wherein the first movable mold is configured to be able to be assembled with the first fixed mold and the second fixed mold respectively; The first injection unit injects the first molding material through the first gate opening of the first fixed mold; The second injection unit injects the second molding material through the second gate opening of the second fixed mold; as well as The position changing unit changes the position of the first movable mold assembly / disassembly unit so that the first movable mold is positioned opposite the first fixed mold or the second fixed mold. The position changing unit has: Drive unit; The rotating shaft component rotates via the drive unit; A rotating disk, connected to the rotating shaft component, and provided with the first movable mold disassembly / removal part; and The second movable mold assembly / disassembly part is capable of assembling and disassembling the second movable mold. The second movable mold is configured to be able to be assembled and disassembled with both the first fixed mold and the second fixed mold. The rotating disk rotates around the rotation axis of the rotating shaft component. A flow path for the medium to flow is formed in the rotating shaft component, passing through the first movable mold. When the first movable mold is positioned opposite the first fixed mold, the position changing unit causes the second movable mold to be positioned opposite the second fixed mold. When the first movable mold is positioned opposite the second fixed mold, the position changing unit causes the second movable mold to be positioned opposite the first fixed mold. The medium passes sequentially through the rotating shaft component, the first movable mold, and the second movable mold, and returns to the rotating shaft component.

2. The injection molding apparatus according to claim 1, characterized in that, The following are formed on the side surface of the rotating shaft component: An inflow groove connected to the medium inlet of the flow path and surrounding the side; and An outflow groove connected to the medium outlet of the flow path and surrounding the side surface. The inflow channel and the outflow channel are separate from each other.

3. Injection molding apparatus according to claim 1 or 2, characterized in that include: The mold closing section allows the rotating shaft component to move forward and backward in the injection direction. The mold closing part is linked with the rotating shaft component to move the drive part.

4. The injection molding apparatus of claim 1, wherein include: The ejection structure is positioned opposite the second fixed mold. No ejection structure is provided at the position opposite to the first fixed mold.

5. The injection molding apparatus according to claim 1, characterized in that, The first injection unit and the second injection unit have a plasticizing section for plasticizing the supplied material. The plasticizing part has: A flat screw with a grooved surface; A roller having opposing surfaces facing the groove and having a communicating hole; and Housing that houses the flat screw. The flat screw has: A first side surface intersects with the groove and has an inlet for introducing the material; and The second side is further away from the roller than the first side. The distance between the second side and the housing is less than the distance between the first side and the housing.

6. The injection molding apparatus according to claim 5, characterized in that, The first molding material is an elastomer resin, The second molding material is a resin other than an elastomer resin, The distance between the second side surface in the first injection unit and the housing is smaller than the distance between the second side surface in the second injection unit and the housing.

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