Injection molding device

Abstract

The utility model provides an injection molding device which can increase the pressure maintaining force during pressure maintaining even if the capacity of a motor is not increased. In the injection molding apparatus, a power transmission unit has: a rotating plate provided with a rotating shaft at an eccentric position; and a support part that supports the plunger, the support part being provided with a hole part through which the rotating shaft passes, the hole part extending in the moving direction of the plunger, the support part being rotated by the rotating plate so as to swing in the extending direction of the hole part, and the support part being rotated by the rotating plate when viewed from the direction of the rotating shaft at the end point in time of the delivery process. An angle formed by a straight line connecting the center of the rotating shaft and the center of the rotating plate and the moving direction of the plunger is larger than 90 degrees and smaller than 180 degrees, and the control part controls the rotating speed of the motor according to the angle in the feeding process.

Description

TECHNICAL FIELD

[0001] The utility model relates to an injection molding device. BACKGROUND

[0002] An injection molding device is known which injects a material that has been plasticized by a plasticizing section toward a cavity and is molded into a molded product by being solidified.

[0003] In, for example, Patent Literature 1, an injection molding machine having an injection control section is described, the injection control section having a cylinder, a plunger that moves within the cylinder, and a plunger drive section that drives the plunger.

[0004] In an injection molding machine like the one described above, after plasticized material is filled into a cavity, a load is applied to a motor of a plunger drive section during a holding pressure at which pressure to the plasticized material filled into the cavity is maintained. Thus, there are cases where the motor needs to be upsized.

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2021-104600 SUMMARY

[0006] One mode of the injection molding device according to the utility model relates to,

[0007] An injection molding device includes:

[0008] a plasticizing section that plasticizes a material to generate plasticized material;

[0009] a nozzle that is formed with a nozzle opening and that sends out the plasticized material from the nozzle opening;

[0010] a suction and delivery section that has a cylinder that communicates with the nozzle opening and that is connected to a flow passage through which the plasticized material flows, a plunger that reciprocally moves within the cylinder, a motor that drives the plunger, and a power transmission section that transmits power of the motor to the plunger;

[0011] a control section that controls the motor,

[0012] the control section implements a suction process and a delivery process,

[0013] in the suction process, the rotational speed of the motor is controlled, and the plasticized material is suctioned into the cylinder by moving the plunger in a direction away from the flow passage,

[0014] in the delivery process, the rotational speed of the motor is controlled, and the plasticized material in the cylinder is delivered toward the nozzle by moving the plunger in a direction toward the flow passage,

[0015] The power transmission portion has:

[0016] A rotating plate provided with a rotating shaft at an eccentric position;

[0017] A support portion formed with a hole portion through which the rotating shaft passes and supporting the plunger,

[0018] The hole portion extends in the moving direction of the plunger,

[0019] The support portion rotates through the rotating plate, thereby oscillating in the extending direction of the hole portion,

[0020] At the end time point of the delivery process, when viewed from the direction of the rotating shaft, the angle formed by the straight line connecting the rotating shaft and the center of the rotating plate and the moving direction of the plunger is greater than 90° and less than 180°,

[0021] The control portion controls the rotational speed of the motor according to the angle in the delivery process.

[0022] In one mode of the injection molding device according to the present application,

[0023] The plunger is composed of a plurality of components,

[0024] The plurality of components are detachable and arranged in the moving direction of the plunger.

[0025] In one mode of the injection molding device according to the present application,

[0026] The plunger is formed with a recess or a protrusion around it,

[0027] The control portion performs a process of making the recess or the protrusion formed on the plunger contact with an abutting portion in the moving direction of the plunger and detecting the length of the plunger by detecting the torque value of the motor.

[0028] In one mode of the injection molding device according to the present application,

[0029] The control portion performs a process of creating control data for controlling the rotational speed of the motor according to the detected length of the plunger or a process of selecting the control data from data stored in a storage portion.

[0030] In one mode of the injection molding device according to the present application,

[0031] The control section performs processing for displaying, on a display section, at least one of a maximum injection force, a maximum holding pressure, a maximum holding time, and a moving speed of the plunger corresponding to the length of the plunger.

[0032] In one mode of the injection molding device according to the present application,

[0033] The control section performs processing for displaying, on a display section, at least one of a maximum injection force, a maximum holding pressure, a maximum holding time, and a moving speed of the plunger corresponding to the length of the plunger.

[0034] In one mode of the injection molding device according to the present application,

[0035] The support section has a wall section provided between the rotating plate and the plunger and connected to the plunger,

[0036] The power transmission section has a force application section provided between the wall section and the rotating plate and applying force to the wall section in a direction toward the flow passage,

[0037] The nozzle has an opening and closing mechanism that opens and closes the nozzle opening,

[0038] The opening and closing mechanism is configured to open the nozzle opening when the pressure of the flow passage is greater than a predetermined pressure,

[0039] The force applied by the force application section is smaller than the reaction force of the plunger generated by the predetermined pressure.

[0040] In one mode of the injection molding device according to the present application,

[0041] The control section performs the suction processing while detecting the pressure of the flow passage,

[0042] At the end time point of the suction processing, the force applied by the force application section is greater than the reaction force of the plunger generated by the pressure of the flow passage. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 A side view of the injection molding device according to the present embodiment is schematically shown.

[0044] Figure 2 A cross-sectional view of the injection molding device according to the present embodiment is schematically shown.

[0045] Figure 3 A perspective view of a flat spiral member of the injection molding device according to the present embodiment is schematically shown.

[0046] Figure 4 Fig. 1 is a perspective view schematically showing a cylinder of an injection molding apparatus according to the present embodiment.

[0047] Figure 5 Fig. 2 is a perspective view schematically showing a suction delivery section of the injection molding apparatus according to the present embodiment.

[0048] Figure 6 Fig. 3 is a perspective view schematically showing the suction delivery section of the injection molding apparatus according to the present embodiment.

[0049] Figure 7 Fig. 4 is a sectional view schematically showing the suction delivery section of the injection molding apparatus according to the present embodiment.

[0050] Figure 8 Fig. 5 is a flowchart for explaining an operation of the injection molding apparatus according to the present embodiment.

[0051] Figure 9 Fig. 6 is a sectional view for explaining a delivery process of the injection molding apparatus according to the present embodiment.

[0052] Figure 10 Fig. 7 is a view for explaining the delivery process of the injection molding apparatus according to the present embodiment.

[0053] Figure 11 Fig. 8 is a perspective view schematically showing a plunger of an injection molding apparatus according to a first modification of the present embodiment.

[0054] Figure 12 Fig. 9 is a perspective view schematically showing a plunger of an injection molding apparatus according to a second modification of the present embodiment. DETAILED DESCRIPTION

[0055] Hereinafter, with respect to a preferred embodiment of the present application, a detailed description will be given using the accompanying drawings. Note that the following described embodiment is not intended to unduly limit the content of the present application recited in the claims. Furthermore, all the structures described below are not necessarily essential structural elements of the present application.

[0056] 1. Injection molding apparatus

[0057] 1.1. Overall structure

[0058] First, with respect to the injection molding apparatus according to the present embodiment, a description will be given while referring to the accompanying drawings. Figure 1 Fig. 1 is a side view schematically showing an injection molding apparatus 100 according to the present embodiment. Note that in the following description, the same reference numerals are used to denote the same components. Figure 1, an X-axis, a Y-axis, and a Z-axis are shown as three axes orthogonal to each other. The X-axis and the Y-axis directions are, for example, horizontal directions. The Z-axis direction is, for example, a vertical direction.

[0059] like Figure 1 As shown, the injection molding apparatus 100 includes a material supply unit 10 , an injection unit 20 , a mold unit 30 , a mold clamping unit 40 , and a control device 50 .

[0060] The material supply unit 10 supplies the raw material to the injection unit 20. The material supply unit 10 is composed of, for example, a hopper. The material supplied from the material supply unit 10 is in the form of, for example, granules or powder. The material supplied from the material supply unit 10 is, for example, acrylonitrile butadiene styrene (ABS) resin.

[0061] The injection unit 20 plasticizes the material supplied from the material supply unit 10 to form a plasticized material. Then, the injection unit 20 injects the plasticized material toward the mold unit 30.

[0062] The term "plasticization" encompasses melting and refers to the process of changing a solid material into a fluid state. Specifically, for materials that undergo a glass transition, plasticization occurs when the material temperature is raised to or above the glass transition point. For materials that do not undergo a glass transition, plasticization occurs when the material temperature is raised to or above the melting point.

[0063] A cavity having a shape corresponding to the molded product is formed in the mold section 30. Plasticized material injected from the injection section 20 flows into the cavity. The plasticized material is then cooled and solidified, thereby producing a molded product.

[0064] The mold clamping unit 40 opens and closes the mold unit 30. After the plasticized material is cooled and solidified, the mold clamping unit 40 opens the mold unit 30. As a result, the molded product is discharged to the outside.

[0065] The control device 50 is comprised of, for example, a computer having a processor, a main storage device, and an input / output interface for inputting and outputting signals to and from the outside. The control device 50 performs various functions by, for example, having the processor execute programs loaded into the main storage device. Specifically, the control device 50 controls the injection unit 20 and the mold clamping unit 40. Alternatively, the control device 50 may be comprised of a combination of multiple circuits rather than a computer.

[0066] 1.2. Specific structure

[0067] Figure 2 , schematically showing the injection molding device 100 Figure 1 The II-II line cross-sectional view. Figure 2As shown, the injection portion 20 has, for example, a plasticizing portion 60, a suction / discharge portion 70, and a nozzle 80.

[0068] The plasticizing portion 60 is configured to plasticize at least a portion of the material supplied from the material supply portion 10 and generate a plasticized material in a paste-like state having fluidity and introduce the plasticized material into the suction / discharge portion 70. The plasticizing portion 60 includes, for example, a screw housing 62, a drive motor 64, a flat screw 110, a cylinder 120, and a heater 130.

[0069] The screw housing 62 is a housing that houses the flat screw 110. The flat screw 110 is housed in a space surrounded by the screw housing 62 and the cylinder 120.

[0070] The drive motor 64 is connected to the screw housing 62. The drive motor 64 rotates the flat screw 110. The drive motor 64 is, for example, a servo motor. A shaft 66 of the drive motor 64 is connected to the flat screw 110. The drive motor 64 is controlled by the control portion 56 of the control device 50.

[0071] The flat screw 110 has a substantially cylindrical shape in which a size in a direction of a rotation axis R is smaller than a size in a direction orthogonal to the direction of the rotation axis R. In the illustrated example, the rotation axis R is parallel to the Y axis. The flat screw 110 is rotated about the rotation axis R by a torque generated by the drive motor 64. The flat screw 110 has, for example, a shaft surface 111 to which the shaft 66 is connected, a groove forming surface 112 on an opposite side to the shaft surface 111, and a connecting surface 113 that connects the shaft surface 111 and the groove forming surface 112. Here, Figure 3 is a perspective view schematically showing the flat screw 110. In addition, for convenience, in Figure 3 , a state in which the state shown in Figure 2 is reversed upside down is shown.

[0072] As shown in Figure 3As shown, a first groove 114 is formed on the groove formation surface 112 of the flat spiral 110. The first groove 114 has, for example, a central portion 115, a connecting portion 116, and a material introduction portion 117. The central portion 115 opposes a communication hole 126 formed on the barrel 120. The central portion 115 communicates with the communication hole 126. The connecting portion 116 connects the central portion 115 and the material introduction portion 117 together. In the illustrated example, the connecting portion 116 is formed in a spiral shape from the central portion 115 toward the outer periphery of the groove formation surface 112. The material introduction portion 117 is formed on the outer periphery of the groove formation surface 112. That is, the material introduction portion 117 is formed on the connecting surface 113 of the flat spiral 110. The material supplied from the material supply portion 10 is introduced from the material introduction portion 117 into the first groove 114, and is transported through the connecting portion 116 and the central portion 115 into the communication hole 126 formed on the barrel 120. In the illustrated example, two first grooves 114 are formed.

[0073] In addition, the number of the first grooves 114 is not particularly limited. Although not illustrated, the first grooves 114 can be formed three or more, or can be formed only one.

[0074] Further, although not illustrated, the plasticizing portion 60 can not have the flat spiral 110, but can have a long straight spiral having a spiral groove on a side surface. Also, the plasticizing portion 60 can plasticize the material by rotation of the straight spiral.

[0075] As shown, Figure 2 The barrel 120 is provided in opposition to the flat spiral 110. The barrel 120 has an opposing surface 122 that opposes the groove formation surface 112 of the flat spiral 110. The opposing surface 122 opposes the groove formation surface 112 in the Y-axis direction. On the center of the opposing surface 122, the communication hole 126 is formed. Here, Figure 4 A diagram schematically showing the barrel 120.

[0076] As shown, Figure 4 On the opposing surface 122 of the barrel 120, a second groove 124 and the communication hole 126 are formed. The second groove 124 is formed in plurality. Although six second grooves 124 are formed in the illustrated example, the number thereof is not particularly limited. The plurality of second grooves 124 are formed at the periphery of the communication hole 126 when viewed from the Y-axis direction. The second groove 124 has one end connected to the communication hole 126, and extends in a spiral shape from the communication hole 126 toward the outer periphery of the opposing surface 122. The second groove 124 has a function of guiding the plasticized material toward the communication hole 126. The communication hole 126 causes the plasticized material to flow out to the outside of the barrel 120.

[0077] Further, the shape of the second groove 124 is not particularly limited, and for example, it can be linear. Furthermore, one end of the second groove 124 can not be connected to the communication hole 126. Further, the second groove 124 can not be formed on the opposing face 122. However, if the effective guidance of the plasticized material into the communication hole 126 is taken into consideration, it is preferable that the second groove 124 be formed on the opposing face 122.

[0078] As shown in FIG. 1, a heater 130 is provided on the cylinder 120. The heater 130 heats the material supplied between the flat spiral 110 and the cylinder 120. The heater 130 heats the material supplied into the first groove 114. The heater 130 is controlled by the control section 56 of the control device 50. The plasticizing section 60 plasticizes the material by the flat spiral 110, the cylinder 120, and the heater 130, thereby generating plasticized material while transporting the material toward the communication hole 126, and causes the generated plasticized material to flow out from the communication hole 126 to the suction delivery section 70. Figure 2

[0079] The suction delivery section 70 has a cylinder 73 and a plunger 78. The suction delivery section 70 guides the plasticized material in the communication hole 126 into the cylinder 73 by moving the plunger 78 in the -X axis direction away from the communication hole 126, and measures the plasticized material in the cylinder 73. Then, the suction delivery section 70 injects the plasticized material in the cylinder 73 into the mold section 30 via a nozzle 80 by moving the plunger 78 in the +X axis direction toward the communication hole 126. Details of the suction delivery section 70 will be described later. Further, in FIG. 1, the suction delivery section 70 is illustrated in a simplified manner. Figure 2

[0080] On the nozzle 80, a nozzle hole 82 is formed. The nozzle hole 82 communicates with the communication hole 126. The nozzle hole 82 has a nozzle opening 84 that injects the plasticized material. The nozzle 80 delivers the plasticized material supplied from the plasticizing section 60 from the nozzle opening 84 toward the molding die 32 of the mold section 30. Specifically, the plasticized material measured in the cylinder 73 is delivered from the suction delivery section 70 to the nozzle hole 82 via the communication hole 126. Then, the plasticized material is injected from the nozzle opening 84 of the nozzle hole 82 to the mold section 30.

[0081] The nozzle hole 82 and the communication hole 126 constitute a flow path 140 for the plasticized material to flow. In the illustrated example, the length direction of the flow path 140 is the Y axis direction. The cylinder 73 is connected to the flow path 140. In the illustrated example, the cylinder 73 extends in the X axis direction.

[0082] As shown in FIG. 1, a heater 130 is provided on the cylinder 120. The heater 130 heats the material supplied between the flat spiral 110 and the cylinder 120. The heater 130 heats the material supplied into the first groove 114. The heater 130 is controlled by the control section 56 of the control device 50. The plasticizing section 60 plasticizes the material by the flat spiral 110, the cylinder 120, and the heater 130, thereby generating plasticized material while transporting the material toward the communication hole 126, and causes the generated plasticized material to flow out from the communication hole 126 to the suction delivery section 70. Figure 2 ​​As shown, the nozzle 80 has an opening and closing mechanism 86 that opens and closes the nozzle opening 84. The opening and closing mechanism 86 is configured to open the nozzle opening 84 when the pressure of the flow passage 140 is greater than a predetermined pressure (hereinafter, also referred to as "nozzle opening pressure"). The opening and closing mechanism 86 is configured by, for example, a valve or the like.

[0083] The mold section 30 has a molding mold 32. The molding mold 32 is a metal mold. The plasticized material that is sent to the nozzle hole 82 is injected from the nozzle hole 82 into a cavity 34 of the molding mold 32. Specifically, the molding mold 32 has a movable mold 36 and a fixed mold 38 that oppose each other, and has the cavity 34 between the movable mold 36 and the fixed mold 38. The cavity 34 is a space that corresponds to the shape of a molded product. The movable mold 36 and the fixed mold 38 are made of metal. Alternatively, the movable mold 36 and the fixed mold 38 can be made of ceramic or resin.

[0084] The mold closing section 40 has, for example, a mold driving section 42 and a ball screw section 44. The mold driving section 42 is configured by, for example, a motor, a gear, or the like. The mold driving section 42 is connected to the movable mold 36 via the ball screw section 44. The mold driving section 42 is controlled by a control section 56 of a control device 50. The ball screw section 44 transmits power generated by driving of the mold driving section 42 to the movable mold 36. The mold closing section 40 moves the movable mold 36 by using the mold driving section 42 and the ball screw section 44, and thereby performs opening and closing of the mold section 30.

[0085] The control device 50 has, for example, a storage section 52, a display section 54, and the control section 56.

[0086] The storage section 52 stores programs or data and the like that are used by the control section 56 to perform various calculation processes or control processes. Further, the storage section 52 is used as a work area of the control section 56. The storage section 52 is configured by, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), or the like.

[0087] The display section 54 displays various images in accordance with an instruction from the control section 56. The display section 54 is configured by, for example, an LCD (Liquid Crystal Display), an organic EL (Electroluminescence) display, an EPD (Electrophoretic Display), a touch panel type display, or the like.

[0088] The control section 56 implements various calculation processing or control processing, for example, in accordance with a program stored in the storage section 52. The control section 56 is configured by, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit), a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), or the like.

[0089] 1.3. Suction and delivery section

[0090] Figure 5 and Figure 6 is a perspective view schematically showing the suction and delivery section 70 of the injection molding device 100 according to the present embodiment. Figure 7 is a perspective view schematically showing the suction and delivery section 70 of the injection molding device 100 according to the present embodiment, Figure 5 is a VII-VII line sectional view of the suction and delivery section 70.

[0091] As shown in Figures 5 to 7 , the suction and delivery section 70 has, for example, a housing 72, a plunger 78, a motor 79, and a power transmission section 150. In Figure 5 , the internal structure of the housing 72 is shown by a broken line for convenience. In Figure 6 , the illustration of the housing 72 is omitted.

[0092] As shown in Figure 5 , the housing 72 has, for example, a substantially rectangular parallelepiped shape. The housing 72 houses the plunger 78 and the power transmission section 150. The housing 72 constitutes a cylinder 73. The cylinder 73 communicates with a nozzle opening 84 and is connected to a flow channel 140 through which a plasticizing material flows. The cylinder 73 extends in the -X axis direction from the flow channel 140, for example.

[0093] The plunger 78 reciprocates within the cylinder 73. In the illustrated example, the plunger 78 reciprocates within the cylinder 73 in the X axis direction. The +X axis direction is the direction in which the plunger 78 approaches the flow channel 140. The -X axis direction is the direction in which the plunger 78 departs from the flow channel 140. The plunger 78 is a rod-shaped member that extends in the X axis direction. The plunger 78 is configured by one member, for example.

[0094] The motor 79 drives the plunger 78 via the power transmission section 150. The type of the motor 79 is not particularly limited as long as it can drive the plunger 78. The motor 79 is controlled by the control section 56.

[0095] The power transmission portion 150 transmits the force of the motor 79 to the plunger 78. As Figure 6 and Figure 7 shown, the power transmission portion 150 has, for example, a rotation plate 152, a shaft 154, a support portion 156, and a force application portion 158.

[0096] As Figure 5 shown, the rotation plate 152 is disposed in the first opening portion 74 formed in the housing 72. The rotation plate 152 has, for example, a shape of a disc. The rotation plate 152 rotates around a rotation axis Q. In the example shown, the rotation axis Q is parallel to the Y axis. As Figure 7 shown, the rotation axis Q is disposed at a position eccentric to the rotation plate 152. That is, when viewed from the Y axis direction, the rotation axis Q is separated from the center O of the rotation plate 152.

[0097] The shaft 154 connects the rotation plate 152 and the motor 79. In the example shown, the shaft 154 is a rod-shaped member extending in the Y axis direction. The shaft 154 rotates around the rotation axis Q by driving of the motor 79. The rotation plate 152 rotates in conjunction with the rotation of the shaft 154. The rotation axis Q is a central axis of the shaft 154.

[0098] The support portion 156 supports the plunger 78. As Figure 6 and Figure 7 shown, the support portion 156 has a first wall portion 156a, a second wall portion 156b, a third wall portion 156c, and a fourth wall portion 156d.

[0099] The first wall portion 156a of the support portion 156 is disposed between the rotation plate 152 and the plunger 78. The plunger 78 is connected to the first wall portion 156a. As Figure 5 and Figure 7 shown, in the housing 72, a second opening portion 75 into which the first wall portion 156a is inserted is formed. The second opening portion 75 is located between the cylinder 73 and the first opening portion 74. The size of the second opening portion 75 in the direction orthogonal to the X axis direction is larger than the size of the cylinder 73 in the direction orthogonal to the X axis direction. Thus, the housing 72 has a stepped surface 76.

[0100] As Figure 6 and Figure 7 shown, the second wall portion 156b of the support portion 156 is disposed in opposition to the first wall portion 156a. The rotation plate 152 is disposed between the first wall portion 156a and the second wall portion 156b in the X axis direction. In the example shown, the second wall portion 156b is in contact with the side surface 153 of the rotation plate 152. Figure 7

[0101] ​The third wall portion 156c and the fourth wall portion 156d of the support portion 156 connect the first wall portion 156a and the second wall portion 156b. The rotation plate 152 is disposed between the third wall portion 156c and the fourth wall portion 156d in the Y-axis direction. As shown in FIG. 6, a hole portion 157 is formed in the third wall portion 156c. The hole portion 157 penetrates the third wall portion 156c in the Y-axis direction. The rotation shaft Q and the shaft 154 pass through the hole portion 157. The hole portion 157 extends in the X-axis direction. The support portion 156 is rotated by the rotation plate 152, and thus swings in the X-axis direction, which is the extending direction of the hole portion 157. The plunger 78 moves in the X-axis direction in conjunction with the swing of the support portion 156. Figure 6 As shown in FIG. 6, a hole portion 157 is formed in the third wall portion 156c. The hole portion 157 penetrates the third wall portion 156c in the Y-axis direction. The rotation shaft Q and the shaft 154 pass through the hole portion 157. The hole portion 157 extends in the X-axis direction. The support portion 156 is rotated by the rotation plate 152, and thus swings in the X-axis direction, which is the extending direction of the hole portion 157. The plunger 78 moves in the X-axis direction in conjunction with the swing of the support portion 156.

[0102] As shown in FIG. 6, a hole portion 157 is formed in the third wall portion 156c. The hole portion 157 penetrates the third wall portion 156c in the Y-axis direction. The rotation shaft Q and the shaft 154 pass through the hole portion 157. The hole portion 157 extends in the X-axis direction. The support portion 156 is rotated by the rotation plate 152, and thus swings in the X-axis direction, which is the extending direction of the hole portion 157. The plunger 78 moves in the X-axis direction in conjunction with the swing of the support portion 156. Figure 7 As shown in FIG. 6, a hole portion 157 is formed in the third wall portion 156c. The hole portion 157 penetrates the third wall portion 156c in the Y-axis direction. The rotation shaft Q and the shaft 154 pass through the hole portion 157. The hole portion 157 extends in the X-axis direction. The support portion 156 is rotated by the rotation plate 152, and thus swings in the X-axis direction, which is the extending direction of the hole portion 157. The plunger 78 moves in the X-axis direction in conjunction with the swing of the support portion 156.

[0103] The contact portion 158a of the urging portion 158 is rotated by the rotation plate 152, and thus moves in the +X-axis direction. Thus, the spring 158b contracts, and the urging portion 158 urges the first wall portion 156a in the +X-axis direction. The urging force generated by the urging portion 158 is smaller than the reaction force of the plunger 78 generated by the nozzle opening pressure. That is, in a case where the pressure of the flow passage 140 becomes the nozzle opening pressure, the urging portion 158 cannot move the first wall portion 156a in the +X-axis direction. The "urging force generated by the urging portion 158" refers to a force by which the urging portion 158 presses the first wall portion 156a in the +X-axis direction. The "reaction force of the plunger 78" refers to a force by which the plunger 78 is pressed in the -X-axis direction by the pressure of the flow passage 140.

[0104] 1.4. Action

[0105] Figure 8 is a flowchart for describing the action of the injection molding device 100. Specifically, Figure 8 is a flowchart for describing the processing of the control portion 56.

[0106] The user operates an unillustrated operation section and outputs a processing start signal for starting the processing to the control section 56. The processing start signal contains, for example, information related to the kind of the material stored in the material supply section 10 and information related to the size (hereinafter, also referred to simply as "length") of the plunger 78 in the X-axis direction. The operation section is constituted, for example, by a mouse, a keyboard, a touch panel, or the like. The control section 56 starts the processing upon receiving the processing start signal.

[0107] First, as step S1, the control section 56 implements a process of acquiring the length of the plunger 78. Specifically, the control section 56 acquires the length of the plunger 78 from the processing start signal. The length of the plunger 78 is set by the user. Figure 8

[0108] Next, as step S2, the control section 56 implements a process of selecting control data for controlling the rotational speed of the motor 79 from the data stored in the storage section 52 in accordance with the detected length of the plunger 78. The control data contains information related to the time series of the rotational speed of the motor 79. In the storage section 52, the control data is stored for each length of the plunger 78.

[0109] In addition, the control section 56 can create the control data in accordance with the detected length of the plunger 78 without reading out the control data from the storage section 52. For example, the control data can be created in accordance with the length of the plunger 78 based on information related to the time series of the rotational speed of the motor 79 stored in advance in the storage section 52 or the like.

[0110] Next, as step S3, the control section 56 implements a process of generating plasticized material. Specifically, the control section 56 controls the drive motor 64 and supplies the material between the flat spiral 110 and the cylinder 120, and controls the heater 130, thereby plasticizing the material to generate plasticized material.

[0111] Next, as step S4, the control section 56 implements a process of controlling the rotational speed of the motor 79 based on the control data and sucking the plasticized material into the cylinder 73 by moving the plunger 78 in the -X-axis direction. Thus, a predetermined amount of plasticized material is sucked into the cylinder 73.

[0112] The control section 56 implements the sucking process of step S4 while detecting the pressure of the flow channel 140. The control section 56 detects the pressure of the flow channel 140 while detecting the torque value of the motor 79, for example. Although not illustrated, the control section 56 can detect the pressure of the flow channel 140 based on an unillustrated pressure sensor provided on the flow channel 140. The control section 56 implements the sucking process so that the acting force of the urging section 158 is greater than the reaction force of the plunger 78 at the end point of the sucking process.​

[0113] Next, as step S5, the control section 56 implements control of the rotational speed of the motor 79 based on the control data, and performs the delivery process of delivering the plasticized material in the cylinder 73 toward the nozzle 80 by moving the plunger 78 in the +X-axis direction. Here, Figure 9 is a sectional view for explaining the delivery process. As Figure 9 indicated, the delivery process is divided into an A interval, a B interval, a C interval, and a D interval, for example. In the A interval to the D interval, the rotating plate 152 rotates in the S direction.

[0114] In the A interval, the acting force of the force applying section 158 is greater than the reaction force of the plunger 78. Therefore, the spring 158b of the force applying section 158 is not compressed, and the plunger 78 moves in the +X-axis direction. Although the pressure of the flow passage 140 becomes high by the movement of the plunger 78, the nozzle opening pressure is not reached.

[0115] In the B interval, the acting force of the force applying section 158 becomes equal to the reaction force of the plunger 78, and the movement of the plunger 78 in the +X-axis direction stops. The spring 158b of the force applying section 158 starts to be compressed.

[0116] In the C interval, in a state where the spring 158b is fully contracted, the plunger 78 moves again in the +X-axis direction. Although the pressure of the flow passage 140 becomes high by the movement of the plunger 78, the nozzle opening pressure is not reached.

[0117] In the D interval, further, the plunger 78 moves in the +X-axis direction, and the pressure of the flow passage 140 reaches the nozzle opening pressure. Thus, the plasticized material that is sucked into the cylinder 73 and metered in the sucking process is injected from the nozzle opening 84 toward the molding die 32. Then, the control section 56 ends the delivery process.

[0118] Here, Figure 10 is a view for explaining the delivery process, specifically, a view when viewed in the Y-axis direction. For convenience, in Figure 10 , the illustration of members other than the rotating plate 152 and the shaft 154 is omitted. In Figure 10 , the states of the C interval and the D interval are illustrated.

[0119] As Figure 10As illustrated, the angle θ changes in the delivery process. The angle θ is an angle that the first straight line Ll makes with the second straight line L2 when viewed from the Y-axis direction. The first straight line Ll is a straight line that links the rotation axis Q and the center O of the rotation plate 152. The second straight line L2 is a straight line that is parallel to the X-axis and passes through the rotation axis Q. The extension direction of the second straight line L2 is the moving direction of the plunger 78. The angle θ is smallest in the A interval and increases in the order of the B interval, the C interval, and the D interval. For example, in the A interval, the angle θ is greater than 0° and smaller than 90°.

[0120] The control section 56 controls the rotation speed of the motor 79 according to the angle θ in the delivery process. The control section 56 controls the rotation speed of the motor 79 according to the angle θ, for example, to fix the moving speed of the plunger 78 in the +X-axis direction in the C interval.

[0121] At the end time point of the delivery process, that is, the end time point of the D interval, the angle θ is greater than 90° and smaller than 180°, preferably, 100° or greater and 170° or less, more preferably, 110° or greater and 160° or less, further more preferably, 120° or greater and 150° or less. The control section 56 controls the motor 79 in such a way that the angle θ becomes greater than 90° and smaller than 180° at the end time point of the delivery process.

[0122] Next, as step S6, the control section 56 performs a process of displaying the changeable amount of the length of the plunger 78 on the display section 54 based on the time series data of the torque value of the motor 79 in the delivery process.

[0123] Specifically, the control section 56 stores the time series data of the torque value of the motor 79 in the delivery process in the storage section 52. Then, the control section 56 reads out the time series data from the storage section 52 after the delivery process ends, and compares the time series data with the control data of each length of the plunger 78 that is stored in the storage section 52 in advance. According to the comparison, the control section 56 determines the changeable amount of the length of the plunger 78, and displays the changeable amount on the display section 54. The "changeable amount of the length of the plunger 78" is the length of the plunger 78 that can perform the delivery process in a state where the load of the motor 79 is controlled to be equal to or less than a predetermined value.

[0124] Further, the control section 56 performs a process of calculating at least one of the maximum injection force, the maximum holding pressure, the longest holding time, and the moving speed of the plunger 78 corresponding to the length of the plunger 78 based on the time series data of the torque value of the motor 79 in the delivery process, and displays the calculated value on the display section 54.

[0125] Further, the "maximum injection force" is the largest force among the injection forces applied in the direction in which the molding die 32 is opened when the plasticized material is injected into the molding die 32. The "maximum holding pressure" is the largest force among the holding pressures applied to the plasticized material injected into the molding die 32. The "longest holding time" is the largest time among the holding times. The "moving speed of the plunger 78" is the moving speed of the plunger 78 in the X-axis direction. The display section 54 can also display the largest speed among the moving speeds of the plunger 78.

[0126] Next, as step S7, the control section 56 performs a process of applying a pressure to the plasticized material injected into the molding die 32 and performing a holding. The control section 56, for example, applies a pressure higher than the pressure of the flow channel 140 at the end time point of the delivery process to the plasticized material injected into the molding die 32. The closer the angle θ is to 180°, the more the load torque and the output of the motor 79 can be suppressed. Further, by suppressing the load torque and the output of the motor 79, it is also possible to extend the holding time. In the holding process, the moving speed of the plunger 78 in the +X-axis direction is smaller than that in the delivery process. In the holding process, the movement of the plunger 78 in the +X-axis direction can also be stopped. The control section 56 ends the holding process after a predetermined time elapses.

[0127] Then, the control section 56 ends the process. Further, the order of step S6 and step S7 is not particularly limited.

[0128] 1.5. Effects

[0129] In the injection molding apparatus 100, the power transmission section 150 has the rotation plate 152 in which the rotation shaft Q is provided at an eccentric position, and the support section 156 that supports the plunger 78 and is formed with the hole section 157 through which the rotation shaft Q passes. The hole section 157 extends in the moving direction of the plunger 78. The support section 156 rotates by the rotation plate 152 and thereby swings in the extending direction of the hole section 157, and at the end time point of the delivery process, the angle θ formed by the first straight line L1 connecting the rotation shaft Q and the center O of the rotation plate 152 and the moving direction of the plunger 78 is larger than 90° and smaller than 180° when viewed from the direction of the rotation shaft Q, and the control section 56 controls the rotation speed of the motor 79 according to the angle θ in the delivery process.

[0130] Therefore, in the injection molding apparatus 100, the pressing force of the plunger 78 in the +X-axis direction can be increased compared to the case where the angle θ is 90° or less. Therefore, even without upsizing the motor 79, it is possible to increase the holding pressure at the time of holding.

[0131] In the injection molding device 100, the control section 56 implements a process of creating control data for controlling the rotational speed of the motor 79 in accordance with the length of the plunger 78, or a process of selecting control data from among data stored in the storage section 52. Therefore, in the injection molding device 100, the suction process and the delivery process can be implemented based on control data corresponding to the length of the plunger 78.

[0132] In the injection molding device 100, the control section 56 implements a process of displaying the changeable amount of the length of the plunger 78 on the display section 54 based on the time-series data of the torque value of the motor 79 in the delivery process. Therefore, the user of the injection molding device 100 can know the changeable amount of the length of the plunger 78.

[0133] In the injection molding device 100, the control section 56 implements a process of displaying at least one of the maximum injection force, the maximum holding pressure, the longest holding time, and the moving speed of the plunger 78 corresponding to the length of the plunger 78 on the display section 54. Therefore, the user of the injection molding device 100 can know at least one of the maximum injection force, the maximum holding pressure, the longest holding time, and the moving speed of the plunger 78 corresponding to the length of the plunger 78.

[0134] In the injection molding device 100, the support section 156 has a first wall section 156a provided between the rotating plate 152 and the plunger 78 and connected to the plunger 78. The power transmission section 150 has a force application section 158 provided between the first wall section 156a and the rotating plate 152 and applying force to the first wall section 156a in a direction close to the flow channel 140. The nozzle 80 has an opening and closing mechanism 86 that opens and closes the nozzle opening 84. The opening and closing mechanism 86 is configured to open the nozzle opening 84 when the pressure of the flow channel 140 is greater than the nozzle opening pressure. The force generated by the force application section 158 is smaller than the reaction force of the plunger 78 generated by the nozzle opening pressure. Therefore, in the injection molding device 100, the acceleration of the motor 79 can be completed before the plasticized material is injected from the nozzle 80, and for example, the plunger 78 can be moved at a fixed speed. Thus, the average of the injection rate of the plasticized material can be achieved.

[0135] In the injection molding device 100, the control section 56 implements the suction process while detecting the pressure of the flow channel 140, and at the end time point of the suction process, the force of the force application section 158 is made greater than the reaction force of the plunger 78 generated by the pressure of the flow channel 140. Therefore, in the injection molding device 100, the delivery process can be started in a state in which the plunger 78 can be moved in the +X-axis direction by the force of the force application section 158.

[0136] 2. Modification of the injection molding device

[0137] 2.1. First Modification

[0138] Next, the injection molding apparatus relating to the first modification of the present embodiment will be described while referring to the drawings. Figure 11 FIG. 8 is a perspective view schematically showing the plunger 78 of the injection molding apparatus 200 relating to the first modification of the present embodiment.

[0139] Hereinafter, in the injection molding apparatus 200 relating to the first modification of the present embodiment, members having the same functions as the structural members of the injection molding apparatus 100 relating to the present embodiment described above are marked with the same reference numerals, and detailed description thereof will be omitted.

[0140] In the injection molding apparatus 100 described above, the plunger 78 is composed of one member.

[0141] In contrast, in the injection molding apparatus 200, the plunger 78 is composed of a plurality of members. In the illustrated example, the plunger 78 is composed of two members, a first member 178 and a second member 278.

[0142] The first member 178 constitutes the root portion of the plunger 78. The first member 178 is connected to the first wall portion 156a of the support portion 156, for example. The first member 178 has a protrusion portion 179 inserted into the second member. On the surface of the protrusion portion 179, an external thread is provided, for example.

[0143] The second member 278 constitutes the tip portion of the plunger 78. The second member 278 is connected to the first member 178. The first member 178 and the second member 278 are arranged in the moving direction of the plunger 78, that is, the X-axis direction. The second member 278 has an insertion hole 279 into which the protrusion portion 179 of the first member 178 is inserted. On the inner surface of the insertion hole 279, an internal thread that is screwed with the external thread of the protrusion portion 179 is provided, for example.

[0144] The first member 178 and the second member 278 are connected together in a detachable manner. For example, by screwing and unscrewing the external thread of the protrusion portion 179 and the internal thread of the insertion hole 279, the first member 178 and the second member 278 can be connected in a detachable manner.

[0145] In addition, although the example in which the plunger 78 is composed of two members is described above, the number of members that constitute the plunger 78 is not particularly limited. Although not illustrated, the plunger 78 can be composed of three or more members.

[0146] In the injection molding device 200, the plunger 78 is composed of a plurality of members, and the plurality of members are detachable and arranged in the moving direction of the plunger 78. Therefore, in the injection molding device 200, the length of the plunger 78 can be easily changed.

[0147] 2.2. Second Modified Example

[0148] Next, the injection molding device related to the second modified example of the present embodiment will be described with reference to the drawings. Figure 12 Fig. 8 is a perspective view schematically showing the plunger 78 of the injection molding device 300 related to the second modified example of the present embodiment.

[0149] Hereinafter, in the injection molding device 300 related to the second modified example of the present embodiment, members having the same functions as the structural members of the injection molding device 100 related to the above-described present embodiment are marked with the same reference numerals, and detailed description thereof will be omitted.

[0150] As with the injection molding device 200 described above, in the injection molding device 300, the plunger 78 has a first member 178 and a second member 278. The second member 278 is formed with a protrusion 302 around the periphery thereof. In the illustrated example, the protrusion 302 is formed around the second member 278 once. The protrusion 302 can also be formed integrally with the second member 278.

[0151] The control section 56 controls the motor 79 when the length of the plunger 78 is acquired, and brings the protrusion 302 into contact with the stepped surface 76 as the abutting portion located in the moving direction of the plunger 78. Then, the control section 56 detects the length of the plunger 78 by detecting the torque value of the motor 79. When the plunger 78 comes into contact with the stepped surface 76, the torque value of the motor 79 becomes large. Therefore, by making the position where the protrusion 302 is provided different depending on the length of the second member 278, the length of the plunger can be detected from the torque value.

[0152] In the injection molding device 300, the plunger 78 is formed with the protrusion 302 around the periphery thereof, and the control section 56 brings the protrusion 302 formed on the plunger 78 into contact with the abutting portion located in the moving direction of the plunger 78, and detects the length of the plunger 78 by detecting the torque value of the motor 79. Therefore, in the injection molding device 300, the length of the plunger 78 can be easily detected.

[0153] In addition, although not illustrated, the abutting portion with which the protrusion 302 comes into contact can also be provided in the -X-axis direction of the plunger 78.

[0154] Further, although not illustrated, a recess can also be formed on the second member 278, and the support portion 156 can be formed with a protrusion that engages with the recess as an abutting portion. Also, the length of the plunger 78 can be detected by bringing the surface of the second member 278 that defines the recess into contact with the protrusion.

[0155] 2.3. Third Modification

[0156] Next, an injection molding device according to a third modification of the present embodiment will be described. Hereinafter, in the injection molding device according to the third modification of the present embodiment, points different from the example of the injection molding device 100 according to the present embodiment described above will be described, and description will be omitted for points that are the same.

[0157] In the injection molding device 100 described above, the material supplied from the material supply portion 10 is ABS resin.

[0158] In contrast, in the injection molding device according to the third modification of the present embodiment, the material supplied from the material supply portion 10 is a material other than ABS resin or a material to which another component is added to ABS resin. With the injection molding device according to the present embodiment, since the holding pressure at the time of holding can be increased, the types of resins that can be handled can be increased.

[0159] As the material supplied from the material supply portion 10, various materials such as a material having thermoplasticity, a metal material, and a ceramic material can be cited as a main material. Here, the meaning of "main material" means a material that becomes the center of the shape of a molded product molded in the injection molding device, and means a material having a content rate of 50% or more in terms of mass percentage in the molded product. Among the materials described above, materials in which the main material is melted as a single body or materials in which a part of the components contained together with the main material is melted and formed into a paste-like material are included.

[0160] As the material having thermoplasticity, for example, a thermoplastic resin can be used. As the thermoplastic resin, for example, general-purpose engineering plastics, super engineering plastics can be cited.

[0161] As the general-purpose engineering plastics, for example, 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 can be cited.

[0162] As the super engineering plastics, for example, polysulfone (PSU), polyethersulfone (PES), polyphenylene sulfide (PPS), polyarylate (PAR), polyimide (PI), polyamide-imide (PAI), polyetherimide (PEI), polyether ether ketone (PEEK) can be exemplified.

[0163] In the material having thermoplasticity, in addition to the pigment or metal, ceramic, an additive such as wax, flame retardant, antioxidant, heat stabilizer, etc. can be mixed. The material having thermoplasticity is plasticized and converted to a molten state by the rotation of the flat spiral 110 and the heating of the heater 130 in the plasticizing section 60. Further, the plasticized material generated in such a manner is solidified by the decrease in temperature after being accumulated from the nozzle 80. It is preferable that the material having thermoplasticity is ejected from the nozzle 80 in a state of being heated to above the glass transition point thereof and completely molten.

[0164] In the plasticizing section 60, instead of the material having thermoplasticity described above, for example, a metal material can be used as a main material. In this case, it is preferable that a component that is molten at the time of generation of the plasticized material is mixed in a powder material in which the metal material is made into a powder and is put into the plasticizing section 60.

[0165] As the metal material, for example, a single metal of magnesium (Mg), iron (Fe), cobalt (Co), or chromium (Cr), aluminum (Al), titanium (Ti), copper (Cu), nickel (Ni), or an alloy containing one or more of these metals, or a maraging steel, stainless steel, cobalt-chromium-molybdenum, titanium alloy, nickel alloy, aluminum alloy, cobalt alloy, cobalt-chromium alloy can be exemplified.

[0166] In the plasticizing section 60, instead of the metal material described above, a ceramic material can be used as a main material. As the ceramic material, for example, an oxide ceramic such as silicon dioxide, titanium dioxide, aluminum oxide, zirconium oxide, or a non-oxide ceramic such as aluminum nitride, etc. can be exemplified.

[0167] The powder material of the metal material or the ceramic material supplied from the material supply section 10 can be a mixed material obtained by mixing a plurality of kinds of powder of a single metal or powder of an alloy, powder of a ceramic material. Further, the powder material of the metal material or the ceramic material can be coated with the thermoplastic resin described above or a thermoplastic resin other than the above. In this case, in the plasticizing section 60, the thermoplastic resin can also be molten to exhibit fluidity.

[0168] In the powder material of the metal material or the ceramic material supplied from the material supply part 10, for example, a solvent can also be added. As the solvent, for example, water; ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, and the like (poly)alkylene glycol monoalkyl ether; ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, and the like (acetate ester); benzene, toluene, xylene, and the like (aromatic hydrocarbon); methyl ethyl ketone, acetone, methyl isobutyl ketone, ethyl n-butyl ketone, diisopropyl ketone, acetylacetone, and the like (ketone); ethanol, propanol, butanol, and the like (alcohol); tetraalkylammonium acetate; dimethyl sulfoxide, diethyl sulfoxide, and the like (sulfoxide solvent); pyridine, γ-picoline, 2,6-lutidine, and the like (pyridine solvent); tetraalkylammonium acetate (for example, tetra-n-butylammonium acetate, and the like); a butyl carbitol acetate, and the like (ionic liquid); and the like can be listed.

[0169] Further, in the powder material of the metal material or the ceramic material supplied from the material supply part 10, for example, a binder can also be added. As the binder, for example, an acrylic resin, an epoxy resin, a silicone resin, a cellulose-based resin, or other synthetic resin, or PLA, PA, PPS, PEEK, or other thermoplastic resin can be listed.

[0170] The above-described embodiments and modified examples are one example, and are not limited to these cases. For example, each of the embodiments and each of the modified examples can be appropriately combined.

[0171] The utility model includes with the structure that the structure in the embodiment explained is essential same, for example, function, method and the structure of same, or purpose and effect same structure, or can realize same purpose's structure. In addition, the utility model includes the structure that the non-essential part of the structure explained in the embodiment is replaced and obtains. In addition, the utility model includes the structure that the structure explained in the embodiment plays the same role effect or can realize the same purpose. In addition, the utility model includes the structure that the structure explained in the embodiment is added to the structure of known technology.

[0172] From the above-described embodiments and modified examples, the following can be derived.

[0173] One mode of an injection molding apparatus includes:

[0174] a plasticizing section that plasticizes a material to generate a plasticized material;

[0175] a nozzle that is formed with a nozzle opening and that sends out the plasticized material from the nozzle opening;

[0176] a suction and delivery section having a cylinder communicating with the nozzle opening and connected to a flow channel through which the plasticized material flows, a plunger reciprocating in the cylinder, a motor driving the plunger, and a power transmission section transmitting power of the motor to the plunger;

[0177] a control section controlling the motor,

[0178] the control section performing a suction process and a delivery process,

[0179] in the suction process, a rotational speed of the motor is controlled, and the plasticized material is sucked into the cylinder by moving the plunger in a direction away from the flow channel,

[0180] in the delivery process, the rotational speed of the motor is controlled, and the plasticized material in the cylinder is delivered to the nozzle by moving the plunger in a direction close to the flow channel,

[0181] the power transmission section has:

[0182] a rotating plate provided with a rotating shaft at an eccentric position;

[0183] a support section formed with a hole section through which the rotating shaft passes and supporting the plunger,

[0184] the hole section extends in a moving direction of the plunger,

[0185] the support section rotates through the rotating plate, thereby swinging in an extending direction of the hole section,

[0186] at an end time point of the delivery process, an angle formed by a straight line connecting the rotating shaft and a center of the rotating plate when viewed from the rotating shaft direction and the moving direction of the plunger is greater than 90° and less than 180°,

[0187] the control section controls the rotational speed of the motor in the delivery process according to the angle.

[0188] According to the injection molding device, the holding pressure can be increased even without making the motor large in capacity.

[0189] In one mode of the injection molding device, the following mode can also be adopted, that is,

[0190] the plunger is composed of a plurality of components,

[0191] the plurality of components are detachable and arranged in the moving direction of the plunger.

[0192] According to the injection molding apparatus, it is possible to easily change the length of the plunger.

[0193] In one embodiment of the injection molding apparatus, the following configuration can be adopted.

[0194] The plunger has a recess or a protrusion formed around the plunger,

[0195] The control section performs a process of bringing the recess or the protrusion formed on the plunger into contact with the abutting portion in the moving direction of the plunger and detecting the length of the plunger by detecting the torque value of the motor.

[0196] According to the injection molding apparatus, it is possible to easily detect the length of the plunger.

[0197] In one embodiment of the injection molding apparatus, the following configuration can be adopted.

[0198] The control section performs a process of creating control data for controlling the rotational speed of the motor based on the detected length of the plunger or a process of selecting the control data from data stored in a storage section.

[0199] According to the injection molding apparatus, it is possible to perform the suction process and the delivery process based on the control data corresponding to the length of the plunger.

[0200] In one embodiment of the injection molding apparatus, the following configuration can be adopted.

[0201] The control section performs a process of displaying the changeable amount of the length of the plunger on the display section based on time-series data of the torque value of the motor in the delivery process.

[0202] According to the injection molding apparatus, the user can know the changeable amount of the length of the plunger.

[0203] In one embodiment of the injection molding apparatus, the following configuration can be adopted.

[0204] The control section performs a process of displaying at least one of the maximum injection force, the maximum holding pressure, the longest holding time, and the moving speed of the plunger corresponding to the length of the plunger on the display section.

[0205] According to the injection molding apparatus, the user can know at least one of the maximum injection force, the maximum holding pressure, the longest holding time, and the moving speed of the plunger corresponding to the length of the plunger.

[0206] In one mode of the injection molding apparatus, the following mode can also be employed, that is,

[0207] The support portion has a wall portion provided between the rotating plate and the plunger and connecting the plunger,

[0208] The power transmission portion has a force applying portion provided between the wall portion and the rotating plate and applying force to the wall portion in a direction approaching the flow passage,

[0209] The nozzle has an opening and closing mechanism that opens and closes the nozzle opening,

[0210] The opening and closing mechanism is configured to open the nozzle opening when the pressure of the flow passage is greater than a predetermined pressure,

[0211] The force generated by the force applying portion is smaller than the reaction force of the plunger generated by the predetermined pressure.

[0212] According to the injection molding apparatus, the average of the injection rate of the plasticized material can be achieved.

[0213] In one mode of the injection molding apparatus, the following mode can also be employed, that is,

[0214] The control portion performs the suction process while detecting the pressure of the flow passage,

[0215] At the end time point of the suction process, the force of the force applying portion is greater than the reaction force of the plunger generated by the pressure of the flow passage.

[0216] According to the injection molding apparatus, the delivery process can be started in a state in which the plunger can be moved by the force of the force applying portion.

[0217] Symbol explanation

[0218] 10…material supply section; 20…injection section; 30…mold section; 32…molding mold; 34…cavity; 36…movable mold; 38…stationary mold; 40…clamping section; 42…mold drive section; 44…ball screw section; 50…control device; 52…storage section; 54…display section; 56…control section; 60…plasticizing section; 62…screw housing; 64…drive motor; 66…shaft; 70…suction delivery section; 72…housing; 73…cylinder; 74…first opening section; 75…second opening section; 76…step surface; 78…plunger; 79…motor; 80…nozzle; 82…nozzle hole; 84…nozzle opening; 86…opening and closing mechanism; 100…injection molding device; 110…flat screw; 111…axial surface; 112…groove forming surface; 113…connecting surface; 114…first groove; 115…central portion; 116…connecting portion; 117…material introduction portion; 120…barrel; 122…opposing surface; 124…second groove; 126…communication hole; 130…heater; 140…flow channel; 150…power transmission section; 152…rotary plate; 153…side surface; 154…shaft; 156…support section; 156a…first wall portion; 156b…second wall portion; 156c…third wall portion; 156d…fourth wall portion; 157…hole portion; 158…force applying portion; 158a…contact portion; 158b…spring; 178…first member; 179…protruding portion; 200…injection molding device; 278…second member; 279…insertion hole; 300…injection molding device; 302…projection.

Claims

1. An injection molding device, characterized in that include: a plasticizing portion that plasticizes the material to produce a plasticized material; a nozzle formed with a nozzle opening and delivering the plasticized material from the nozzle opening; a suction and delivery portion comprising a cylinder communicating with the nozzle opening and connected to a flow channel for the plasticized material to flow, a plunger reciprocating in the cylinder, a motor driving the plunger, and a power transmission portion transmitting power from the motor to the plunger; a control unit, which controls the motor, The control unit performs suction processing and delivery processing, During the suction process, the rotation speed of the motor is controlled, and the plunger is moved in a direction away from the flow channel, thereby sucking the plasticized material into the cylinder. In the delivery process, the rotation speed of the motor is controlled, and the plunger is moved toward the flow channel to deliver the plasticized material in the cylinder toward the nozzle. The power transmission unit has: a rotating plate having a rotating shaft disposed at an eccentric position; a support portion having a hole through which the rotating shaft passes and supporting the plunger, The hole portion extends in the moving direction of the plunger, The support portion is rotated by the rotating plate, thereby swinging in the extending direction of the hole portion. At the end time point of the feeding process, when viewed from the direction of the rotation axis, the angle formed by the straight line connecting the rotation axis and the center of the rotation plate and the moving direction of the plunger is greater than 90° and less than 180°, The control unit controls the rotation speed of the motor according to the angle during the feeding process.

2. The injection molding device according to claim 1, wherein The plunger is composed of multiple parts. The plurality of components are detachable and arranged in the moving direction of the plunger.

3. The injection molding device according to claim 1, wherein The plunger is formed with a concave portion or a convex portion around it. The control unit performs a process of causing the concave portion or the convex portion formed on the plunger to contact an abutment portion located in the moving direction of the plunger and detecting a torque value of the motor to thereby detect the length of the plunger.

4. The injection molding device according to claim 3, wherein The control unit creates control data for controlling the rotational speed of the motor based on the detected length of the plunger, or selects the control data from data stored in a storage unit.

5. The injection molding device according to claim 1, wherein The control unit performs a process of displaying a changeable amount of the length of the plunger on a display unit based on time-series data of a torque value of the motor during the feeding process.

6. The injection molding device according to claim 1, wherein The control unit performs a process of causing a display unit to display at least one of a maximum injection force, a maximum holding pressure, a maximum holding time, and a moving speed of the plunger according to the length of the plunger.

7. The injection molding device according to any one of claims 1 to 6, characterized in that The support portion has a wall portion, which is provided between the rotating plate and the plunger and is connected to the plunger. The power transmission part includes a force applying part, which is provided between the wall part and the rotating plate and applies force to the wall part in a direction close to the flow channel. The nozzle has an opening and closing mechanism for opening and closing the nozzle opening. The opening and closing mechanism is configured to open the nozzle opening when the pressure in the flow path exceeds a predetermined pressure. The urging force generated by the urging portion is smaller than the reaction force of the plunger generated by the predetermined pressure.

8. The injection molding device according to claim 7, wherein The control unit performs the suction process while detecting the pressure of the flow channel. At the end time point of the suction process, the biasing force of the biasing portion is greater than the reaction force of the plunger generated by the pressure of the flow channel.

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