Injection molding machine

Abstract

To provide an injection molding machine capable of more appropriately setting a temperature when melting a resin.SOLUTION: An injection molding machine includes: an injection device 10 that melts a resin material in a heating barrel 11 and injects the resin material from a nozzle 12; a plurality of heaters 15 that are arranged in the heating barrel 11 to heat the resin material; a temperature control part 117 that controls the temperature of each of the heaters 15 arranged in the heating barrel 11; a monitoring data acquisition part 113 that acquires monitoring data detected by the injection device 10 when the resin material is melted by the injection device 10; a molten state estimation part 115 that estimates a resin molten state, which is a molten state of the resin material in the heating barrel 11, based on the monitoring data acquired by the monitoring data acquisition part 113; and a temperature setting part 116 that sets the temperature for each heater 15 when the temperature control part 117 controls the temperature of the heater 15 based on the resin molten state estimated by the molten state estimation part 115.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an injection molding machine. [Background technology]

[0002] In an injection molding machine that performs molding by injecting molten resin into a mold, a heater is provided in a barrel that melts the resin inside in order to melt and plasticize the solid resin. When molding with an injection molding machine, the barrel is heated by the heater, and the resin is melted inside the barrel while controlling the temperature of the barrel. Conventional injection molding machines have multiple zones that control the temperature of the barrel from the upstream side to the downstream side of the barrel, and the temperature of the heater is controlled to control the temperature of the barrel for each control zone.

[0003] Of the multiple control zones, the control zone at the tip side where the nozzle that injects the molten resin inside the barrel is located has its set temperature set to a temperature close to the resin temperature during molding. This value is generally determined based on the recommended temperature for each resin or flow analysis. On the other hand, there are no specific specified or recommended values ​​for the temperature for the other control zones, so the temperature is generally set based on the experience of the operator who operates the injection molding machine, but the temperature setting needs to be changed depending on the type of resin and the molding cycle time.

[0004] As described above, the temperature setting of the control zones other than the control zone at the tip of the barrel largely depends on the experience of the operator, and therefore, if an inexperienced operator sets the temperature, it is considered that the appropriate temperature cannot be set. For this reason, some conventional injection molding machines are designed to allow appropriate temperature setting regardless of the operator's experience. For example, in the injection molding machine described in Patent Document 1, when the set temperature of the part corresponding to the part where the molten resin accumulates in front of the screw when the metering in the cylinder is completed is set, the set temperature of the other parts is calculated based on the molding conditions. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2007 / 105646 Summary of the Invention [Problem to be solved by the invention]

[0006] Here, the amount of heat received by the resin when the resin in the barrel is heated to melt it is not only the heat from the heater, but also the frictional heat of the resin in the barrel and the shear heat of the molten resin, etc., which account for a very large proportion. The amount of heat based on the movement of the resin in the barrel depends on the physical properties of the resin and the supply status of the pellets, which are the raw material, and therefore it is difficult to control the amount of heat based on the movement of the resin. If the temperature setting for melting the resin is not appropriate, molding defects will occur due to insufficient or excessive heat of the melted resin, which may cause unstable production.

[0007] For example, in Patent Document 1, the temperature settings of the control zones other than the control zone at the tip of the barrel are calculated based on the molding conditions, but because temperature disturbances during molding and frictional heat and shear heat of the resin inside the barrel are not taken into consideration, it becomes difficult to maintain a constant molten state of the resin.As such, conventional injection molding machines have room for improvement in terms of temperature settings for melting the resin inside the barrel.

[0008] The present invention has been made in view of the above, and has an object to provide an injection molding machine that can more appropriately set the temperature when melting a resin. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems and achieve the object, an injection molding machine according to the present invention includes an injection device that melts a resin material in a heated barrel having a screw disposed inside, and injects the resin material from the nozzle by moving the screw toward a side where a nozzle that injects the molten resin material is located, a plurality of heaters that are disposed in the longitudinal direction of the heated barrel and heat the resin material in the heated barrel, a temperature control unit that performs temperature control for each of the heaters, a plurality of which are disposed in the heated barrel, a monitoring data acquisition unit that acquires monitoring data detected by the injection device when the resin material is melted by the injection device, a melted state estimation unit that estimates a resin molten state, which is the molten state of the resin material in the heated barrel, based on the monitoring data acquired by the monitoring data acquisition unit, and a temperature setting unit that sets a temperature for each of the heaters when controlling the temperature of the heaters by the temperature control unit, based on the resin molten state estimated by the melted state estimation unit. Effect of the Invention

[0010] The injection molding machine according to the present invention has an advantage that the temperature can be set more appropriately when melting a resin. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram showing an example of the configuration of an injection molding machine according to an embodiment. [Diagram 2] FIG. 2 is a detailed view of the injection device shown in FIG. [Diagram 3] FIG. 3 is a detailed view of the heating barrel shown in FIG. [Figure 4] FIG. 4 is a detailed view of the check ring shown in FIG. [Diagram 5] FIG. 5 is an explanatory diagram of the control device shown in FIG. [Figure 6] FIG. 6 is a flow diagram showing a control procedure when molding is performed by the injection molding machine according to the embodiment. [Figure 7]FIG. 7 is a diagram showing the simulation results when the barrel temperature setting is automatically changed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of an injection molding machine according to the present disclosure will be described in detail with reference to the drawings. Note that the present invention is not limited to this embodiment. In addition, the components in the following embodiments include those that are replaceable and easily conceivable by a person skilled in the art, or those that are substantially the same.

[0013] [Embodiment] 1 is a schematic diagram showing a configuration example of an injection molding machine 1 according to an embodiment. In the following description, the up-down direction of the injection molding machine 1 in a normal use state is described as the up-down direction Z of the injection molding machine 1, the upper side of the injection molding machine 1 in a normal use state is described as the upper side of the injection molding machine 1, and the lower side of the injection molding machine 1 in a normal use state is described as the lower side of the injection molding machine 1. In the following description, the longitudinal direction Y of the injection molding machine 1 is also described as the longitudinal direction Y of each part having the injection molding machine 1, and the direction perpendicular to both the up-down direction Z and the longitudinal direction Y of the injection molding machine 1 is described as the width direction X of the injection molding machine 1.

[0014] <Injection molding machine 1> The injection molding machine 1 according to this embodiment has an injection unit 10 and a clamping unit 70, and the injection unit 10 and the clamping unit 70 are mounted on a frame 5 arranged at the lower end of the injection molding machine 1. The injection molding machine 1 melts a resin material into a plasticized material in the injection unit 10, and the plasticized material injected from the injection unit 10 is cooled and solidified by the clamping unit 70, thereby making it possible to manufacture various desired molded products.

[0015] The injection device 10 includes a heating barrel 11, a screw 20, a rotating mechanism 40, a forward / backward mechanism 50, and a propulsion mechanism 30. The heating barrel 11 is capable of heating and melting a resin material therein to form a plasticized material. The heating barrel 11 also includes a nozzle 12 at one end for injecting the plasticized material, and the other end is connected to a hopper 18 for feeding raw material. The screw 20 is disposed inside the heating barrel 11 and is capable of moving in the axial direction inside the heating barrel 11.

[0016] The rotation mechanism 40 is capable of introducing the resin material from the hopper 18 into the heating barrel 11 by rotating the screw 20 inside the heating barrel 11 .

[0017] The forward and backward movement mechanism 50 is capable of moving the screw 20 in the longitudinal direction Y within the heating barrel 11. In addition, the forward and backward movement mechanism 50 can extrude the resin material from the nozzle 12 by moving the screw 20 toward the nozzle 12 while the molten resin material is stored in the end portion of the heating barrel 11 where the nozzle 12 is located. This allows the resin material molten within the heating barrel 11 to be injected from the nozzle 12.

[0018] The mold clamping unit 70 has a fixed platen 71, a movable platen 72, a mold 75, a mold clamping drive mechanism 80, and an ejection mechanism 85. The fixed platen 71 is disposed on a frame 5 and fixed to the frame 5, and the movable platen 72 is disposed on the frame 5 on the opposite side of the fixed platen 71 from the side on which the injection unit 10 is located, and is disposed so as to be freely movable relative to the fixed platen 71.

[0019] The mold 75 has a cavity 75a filled with the resin material injected from the nozzle 12 of the heating barrel 11 of the injection device 10, and the resin material can be molded in the cavity 75a. The mold 75 for molding the resin material in this manner has a fixed mold 76 and a movable mold 77. The fixed mold 76 is attached to the surface of the fixed platen 71 on the side where the movable platen 72 is located, and the movable mold 77 is attached to the surface of the movable platen 72 on the side where the fixed platen 71 is located. The movable mold 77 attached to the movable platen 72 faces the fixed mold 76 attached to the fixed platen 71, and when the movable platen 72 approaches the fixed platen 71, it approaches the fixed mold 76 and is combined with the fixed mold 76.

[0020] The mold clamping drive mechanism 80 is capable of moving the movable platen 72 relative to the fixed platen 71, and by moving the movable platen 72 relative to the fixed platen 71, it is possible to close the movable mold 77 and the fixed mold 76, or to open the movable mold 77 and the fixed mold 76. In this embodiment, the mold clamping drive mechanism 80 includes a so-called toggle mechanism 81, which is capable of moving the movable platen 72 relative to the fixed platen 71.

[0021] The pushing mechanism 85 includes a pushing member 86 that pushes out the molded product that has been attached to the inner surface of the movable die 77 after molding, and enables the molded product to be removed from the movable die 77 after molding.

[0022] <Injection device 10> In the following description, the side where the mold clamping device 70 is located relative to the injection device 10 in the longitudinal direction Y will be referred to as the front or front side, and the side opposite the side where the mold clamping device 70 is located relative to the injection device 10 in the longitudinal direction Y will be referred to as the rear or rear side.

[0023] Fig. 2 is a detailed view of the injection device 10 shown in Fig. 1. The injection device 10 is disposed on the frame 5 via a propulsion mechanism 30. The propulsion mechanism 30 has a driving motor 31, and the driving force generated by the driving motor 31 enables the injection device 10 to move in the longitudinal direction Y relative to the frame 5.

[0024] The heating barrel 11 of the injection device 10 extends forward in the longitudinal direction Y, and a nozzle 12 is disposed at the tip, i.e., the front end of the heating barrel 11, in close contact with a mold 75 (see FIG. 1). More specifically, the heating barrel 11 is formed in a substantially cylindrical shape, and is disposed with its axial direction oriented along the longitudinal direction Y, and is provided with a heater 15 such as a band heater. This allows the heating barrel 11 to melt a resin material inside. In other words, the heating barrel 11 can increase the temperature of the heating barrel 11 by the heater 15, and the resin material inside can be heated and melted to become a molten resin, which is a plasticized material.

[0025] The screw 20 is disposed inside the heating barrel 11 and has a helical shape whose axial direction is along the axial direction of the heating barrel 11, that is, the screw 20 has a helical groove on the outer circumferential surface. Thus, the screw 20 formed in a helical shape is rotatable around the axial center in the heating barrel 11. Also, the screw 20 is movable in the axial direction of the rotation in the heating barrel 11. In other words, the screw 20 is disposed in the heating barrel 11 so that the central axis of the cylinder, which is the shape of the heating barrel 11, and the rotation axis of the screw 20 are approximately aligned, and the screw 20 is disposed so as to be movable in the axial direction of the heating barrel 11. The screw 20 rotatably disposed in the heating barrel 11 is capable of kneading the molten resin by rotating inside the heating barrel 11, and therefore the heating barrel 11 is a barrel capable of kneading the molten resin inside.

[0026] A hopper 18 is disposed at a position near the rear end of the heating barrel 11. The hopper 18 communicates with the inside of the heating barrel 11 and is capable of supplying pellets (not shown) which are granular resin material to the heating barrel 11.

[0027] The rotation mechanism 40 is disposed behind the heating barrel 11 in the longitudinal direction Y, and is capable of rotating the screw 20 disposed inside the heating barrel 11 about its central axis. The rotation mechanism 40 that rotates the screw 20 has a rotation mechanism main body 41, a driving motor 43, a transmission belt 45, and a pulley 46.

[0028] The driving motor 43 is disposed, for example, on the upper side of the rotation mechanism main body 41. The driving motor 43 has an encoder 44 that detects the rotation speed of the driving motor 43. The encoder 44 of the driving motor 43 can detect the rotation speed of the screw 20 via the rotation speed of the driving motor 43 when the resin material is melted in the heating barrel 11 or when the resin material is metered.

[0029] The pulley 46 is disposed in front of the rotation mechanism main body 41 and is disposed rotatably relative to the rotation mechanism main body 41 via a bearing 47. The pulley 46 is also connected to the drive shaft of the driving motor 43 via a transmission belt 45, so that the pulley 46 can rotate by the driving force of the driving motor 43 transmitted via the transmission belt 45. In this way, the pulley 46, which can rotate by the driving force transmitted from the driving motor 43, is fixed coaxially and integrally with the screw 20. In other words, the rear end side of the screw 20 in the longitudinal direction Y is connected to the pulley 46. As a result, the screw 20 disposed in the heating barrel 11 can rotate integrally with the pulley 46 by the driving force transmitted from the driving motor 43 to the pulley 46.

[0030] A forward / backward movement mechanism 50 is disposed behind the rotation mechanism main body 41 in the longitudinal direction Y. The forward / backward movement mechanism 50 is capable of moving the screw 20 disposed in the heating barrel 11 in the axial direction of the screw 20. That is, the screw 20 can be advanced or retreated in the longitudinal direction Y. More specifically, the forward / backward movement mechanism 50 has a driving motor 51, a transmission belt 53, a pulley 54, and a ball screw mechanism 56.

[0031] The driving motor 51 has an encoder 52 that detects the rotational position and rotational speed of the driving motor 51, and the drive shaft of the driving motor 51 is connected to a pulley 54 via a transmission belt 53. The encoder 52 of the driving motor 51 can detect the position in the moving direction of the screw 20 when the resin material is injected from the nozzle 12 of the heating barrel 11 via the rotational position of the driving motor 51. In addition, the encoder 52 of the driving motor 51 can detect the injection speed, which is the moving speed of the screw 20 when the resin material is injected from the nozzle 12 of the heating barrel 11, by detecting the rotational speed of the driving motor 51.

[0032] The pulley 54 is integrally connected to a screw portion 57 of a ball screw mechanism 56. The screw portion 57 of the ball screw mechanism 56 is disposed coaxially with the screw 20, and is also disposed coaxially with the pulley 46 of the rotation mechanism main body 41. The nut portion 58 of the ball screw mechanism 56 of the forward / rearward movement mechanism 50 is formed in a substantially cylindrical shape, and the screw portion 57 of the ball screw mechanism 56 is screwed into the nut portion 58.

[0033] A load cell 60 is disposed between the nut portion 58 of the ball screw mechanism 56 of the forward / rearward movement mechanism 50 and the rotation mechanism main body 41 of the rotation mechanism 40 in the longitudinal direction Y. The load cell 60 is disposed behind the rotation mechanism main body 41 of the rotation mechanism 40 and in front of the nut portion 58 of the ball screw mechanism 56 of the forward / rearward movement mechanism 50.

[0034] The load cell 60 is a load measuring device that measures a load applied in the axial direction, and is composed of a strain body and a strain sensor (both not shown) attached to the strain body. In this embodiment, the load cell 60 is arranged such that the axial direction is the longitudinal direction Y, and is formed in a substantially cylindrical shape that is flat in the longitudinal direction Y, and the inner diameter of the cylinder is larger than the outer diameter of the screw portion 57 of the ball screw mechanism 56 of the forward / reverse mechanism 50. The load cell 60 thus formed has a front surface in the longitudinal direction Y integrally fixed to the rotation mechanism main body 41 of the rotation mechanism 40, and a rear surface in the longitudinal direction Y integrally fixed to the nut portion 58 of the ball screw mechanism 56 of the forward / reverse mechanism 50.

[0035] The load cell 60 disposed between the rotation mechanism main body 41 of the rotation mechanism 40 and the nut portion 58 of the ball screw mechanism 56 of the forward / reverse mechanism 50 is capable of detecting a load acting in the longitudinal direction Y between the rotation mechanism main body 41 and the nut portion 58. The load cell 60 is capable of detecting the pressure acting on the screw 20 when the resin material is metered in the heating barrel 11 and the pressure acting on the screw 20 when the resin material is injected from the nozzle 12, by detecting the load acting between the rotation mechanism main body 41 and the nut portion 58.

[0036] Fig. 3 is a detailed view of the heating barrel 11 shown in Fig. 2. As shown in Fig. 3, the heating barrel 11 is formed in a substantially cylindrical shape, and a heater 15 such as a band heater is arranged on the outer circumferential surface. A plurality of heaters 15 are arranged in the longitudinal direction Y of the heating barrel 11, and it is possible to heat the resin material inside the heating barrel 11. The type and heating method of the heater 15 are not limited, and may be mica, ceramics, an IH heater, a radiant heat heater, a heater using a fluid as a heat medium, or the like.

[0037] The heaters 15 arranged in the longitudinal direction Y of the heating barrel 11 can each be independently controlled in temperature. Therefore, the heating barrel 11 has a plurality of control zones that can be independently controlled in temperature. Each control zone corresponds to one heater 15, and the plurality of control zones are arranged side by side in the longitudinal direction Y, just like the plurality of heaters 15.

[0038] In this embodiment, the control zones include four control zones H1, H2, H3, and H4, arranged from the side where the nozzle 12 is located to the side where the hopper 18 is located in the longitudinal direction Y of the heating barrel 11. That is, H1 is a control zone that controls the temperature of the tip, which is the end of the heating barrel 11 on the side where the nozzle 12 is located, and H4 is a control zone that controls the temperature of the position of the heating barrel 11 closest to the hopper 18, which is in front of the hopper 18.

[0039] The number of control zones set in the longitudinal direction Y of the heating barrel 11 may be other than four. That is, for example, three control zones may be set, or five or more control zones may be set.

[0040] Further, a cooling section 16 is disposed in the heating barrel 11. The cooling section 16 is disposed on the outer circumferential surface of the heating barrel 11 at a position where the hopper 18 is disposed in the longitudinal direction Y. That is, the cooling section 16 is disposed on the opposite side of the heater 15 from the side where the nozzle 12 is disposed in the longitudinal direction Y. A passage (not shown) through which a refrigerant such as cooling water flows is formed in the cooling section 16. The cooling section 16 is capable of cooling the vicinity of the hopper 18 in the longitudinal direction Y of the heating barrel 11 by flowing the refrigerant through the passage in the cooling section 16.

[0041] A control zone for controlling the temperature of the heating barrel 11 is also set at a position where the cooling unit 16 is disposed. The control zone set at the position where the cooling unit 16 is disposed is set as a HOP, which is a control zone for controlling the temperature of the inlet of the resin material in the heating barrel 11.

[0042] The nozzle 12, which is disposed at the front end of the heated barrel 11 in the longitudinal direction Y, is formed in a substantially cylindrical shape with an inner diameter smaller than that of the heated barrel 11, and is disposed so as to open to the front side in the longitudinal direction Y. A resin temperature sensor 13 and a resin pressure sensor 14 are disposed in the nozzle 12. The resin temperature sensor 13 is capable of detecting the temperature of the molten resin passing through the nozzle 12. The resin pressure sensor 14 is capable of detecting the pressure of the molten resin in the nozzle 12, and by detecting the pressure of the molten resin in the nozzle 12, it is possible to measure the resin pressure of the molten resin metered in the heated barrel 11.

[0043] The screw 20 disposed within the heating barrel 11 has a flight 21 that protrudes outward in the radial direction of the screw 20 and is formed in a spiral shape centered on the axis of the screw 20. As a result, the screw 20 has a spiral groove-like portion between adjacent revolution portions of the flight 21 that is formed in a spiral shape.

[0044] A check ring 25 is disposed in the screw 20 formed in this manner near the front end in the longitudinal direction Y. The check ring 25 is disposed in a groove 22 formed in the screw 20 near the front end in the longitudinal direction Y. The groove 22 has a groove width direction that is aligned with the axial direction of the screw 20, and is a groove formed around one revolution in the circumferential direction of the screw 20.

[0045] FIG. 4 is a detailed view of the check ring 25 shown in FIG. 3. The check ring 25 is formed in a substantially cylindrical shape and is disposed in the groove portion 22 of the screw 20 with its axis substantially coinciding with the axis of the screw 20. The check ring 25 formed in a substantially cylindrical shape has an outer diameter that is approximately the same as the inner diameter of the heating barrel 11 and is slightly smaller than the inner diameter of the heating barrel 11. The inner diameter of the check ring 25 is larger than the diameter of the groove bottom of the groove portion 22 of the screw 20, and a gap is formed between the inner peripheral surface of the check ring 25 and the groove bottom of the groove portion 22 of the screw 20. The width of the check ring 25 in the axial direction is smaller than the groove width of the groove portion 22 of the screw 20. For this reason, the check ring 25 is capable of moving in the groove width direction within the groove portion 22.

[0046] Further, the screw 20 is formed with a communication portion 24 that communicates between a portion forward of the groove portion 22 in the longitudinal direction Y and the inside of the groove portion 22. The communication portion 24 opens into a groove wall 23 on the front side of the groove portion 22 in the groove width direction.

[0047] The injection molding machine 1 also has a temperature disturbance sensor 200 that detects a temperature disturbance when the resin material is melted by the injection device 10. That is, the temperature disturbance sensor 200 is capable of detecting a temperature that may affect the melting of the resin material due to a factor other than the heater 15 when the resin material is melted and molded by the injection molding machine 1. In this embodiment, the temperature disturbance sensor 200 includes an outside air temperature sensor 201, a cooling water temperature sensor 202, an input resin temperature sensor 203, a barrel inner wall temperature sensor 204, and a heater vicinity temperature sensor 205.

[0048] Of these, the outside air temperature sensor 201 (see FIG. 2) is capable of detecting the temperature around the injection molding machine 1. The cooling water temperature sensor 202 (see FIG. 3) is provided in the cooling section 16 arranged in the heating barrel 11, and is capable of detecting the temperature of the refrigerant flowing in the cooling section 16, i.e., the temperature of the cooling water. The input resin temperature sensor 203 (see FIG. 3) is provided in the hopper 18 that supplies the resin material to the heating barrel 11, and is capable of detecting the temperature of the resin material before it is supplied to the heating barrel 11.

[0049] The barrel inner wall temperature sensor 204 (see FIG. 3) is disposed on the wall surface of the heating barrel 11 and exposed to the inner circumferential surface of the heating barrel 11, and is capable of detecting the temperature of the inner wall of the heating barrel 11. The heater vicinity temperature sensor 205 (see FIG. 3) is disposed in the vicinity of the heater 15 disposed in the heating barrel 11, and is capable of detecting the temperature in the vicinity of the heater 15.

[0050] The outside air temperature sensor 201, the cooling water temperature sensor 202, the input resin temperature sensor 203, the barrel inner wall temperature sensor 204, and the heater vicinity temperature sensor 205, which are provided as the temperature disturbance sensor 200, are all electrically connected to the control device 100, and the detection results can be transmitted to the control device 100.

[0051] <Control device 100> The injection molding machine 1 has a control device 100 that performs various controls of the injection molding machine 1, an input unit 150 through which an operator performs input operations to the injection molding machine 1, and a display unit 160 that displays various information. Both the input unit 150 and the display unit 160 are connected to the control device 100, and the input unit 150 transmits the input information to the control device 100. The display unit 160 displays the information transmitted from the control device 100. The input unit 150 and the display unit 160 may be configured separately, or may be formed integrally by being configured as a so-called touch panel type display.

[0052] The control device 100 is connected to various actuators such as a motor that serves as a power source for the operation of the injection molding machine 1, and various sensors that acquire information during the operation of the injection molding machine 1. This allows the control device 100 to control the injection molding machine 1 by transmitting control signals to the actuators of the injection molding machine 1 while acquiring information during the operation of the injection molding machine 1 using the sensors. The control device 100 is capable of controlling the pressure of the resin material in the mold 75, for example, by controlling the movement of the screw 20 when the molten resin material is injected from the nozzle 12 of the heating barrel 11.

[0053] Fig. 5 is an explanatory diagram of the control device 100 shown in Fig. 1. The control device 100 has a processing unit 110, a storage unit 130, and an input / output unit 140. The processing unit 110 has a CPU (Central Processing Unit) that performs arithmetic processing, and a RAM (Random Access Memory) and a ROM (Read Only Memory) that function as memories for storing various information. All or part of the functions of the processing unit 110 are realized by loading an application program held in the ROM into the RAM and executing it on the CPU, thereby reading and writing data in the RAM and the ROM.

[0054] The memory unit 130 is a storage device that is electrically connected to the processing unit 110 and stores information. When the control device 100 controls the injection molding machine 1, information acquired from the injection molding machine 1 by the processing unit 110 and information calculated by the processing unit 110 are stored in the memory unit 130, and the information stored in the memory unit 130 is called up by the processing unit 110 and used to control the injection molding machine 1.

[0055] In the present embodiment, the storage unit 130 stores information about the shape of the injection device 10. The information about the shape of the injection device 10 is used for control to melt the resin material in the heating barrel 11. Examples of the information about the shape of the injection device 10 stored in the storage unit 130 include the interval in the longitudinal direction Y of the flights 21 of the screw 20, the height of the flights 21 in the radial direction of the screw 20, the gradient of the height of the flights 21, which is the degree of change in the height of the flights 21 in the longitudinal direction Y, the inner diameter of the heating barrel 11, the gap between the inner peripheral surface of the heating barrel 11 and the flights 21, the helical angle of the flights 21 formed in a helical shape, the helical angle of the flights 21 on the inner peripheral surface of the heating barrel 11, and the length of the screw 20 in the longitudinal direction Y.

[0056] Each function realized by the processing unit 110 may be stored in advance as a program in the storage unit 130. In this case, the processing unit 110 executes each function by calling up the program stored in the storage unit 130 and executing operations according to the program in the processing unit 110. The storage unit 130 may be provided integrally with the control device 100, or may be configured to be detachable from the control device 100.

[0057] The input / output unit 140 is a so-called interface that inputs and outputs signals between the control device 100 and external devices. That is, various actuators and various sensors of the injection molding machine 1 connected to the control device 100, the input unit 150, and the display unit 160 are connected to the input / output unit 140. Examples of the actuators and various sensors connected to the input / output unit 140 include the heater 15 of the heating barrel 11 of the injection device 10, the driving motor 31 of the propulsion mechanism 30, the driving motor 43 and the encoder 44 of the rotation mechanism 40, the driving motor 51 and the encoder 52 of the forward / reverse mechanism 50, and the load cell 60. The processing unit 110 of the control device 100 transmits and receives signals between these external devices via the input / output unit 140.

[0058] The processing unit 110 functionally has a rotation control unit 111, a movement control unit 112, a monitoring data acquisition unit 113, a temperature disturbance acquisition unit 114, a molten state estimation unit 115, a temperature setting unit 116, and a temperature control unit 117.

[0059] Of these, the rotation control unit 111 is capable of controlling the rotation of the screw 20 by controlling the drive of the drive motor 43 of the rotation mechanism 40. When controlling the rotation of the screw 20, the rotation control unit 111 controls the drive of the drive motor 43 while detecting the rotation speed of the screw 20 based on the detection result of the rotation speed of the drive motor 43 by the encoder 44 of the drive motor 43. This enables the rotation control unit 111 to control the rotation of the screw 20 at a desired rotation speed.

[0060] The movement control unit 112 is capable of controlling the movement of the screw 20 in the longitudinal direction Y by controlling the drive motor 51 of the forward / reverse mechanism 50. When controlling the movement of the screw 20, the movement control unit 112 controls the drive of the drive motor 51 while detecting the position of the screw 20 in the longitudinal direction Y based on the detection results of the rotational position and rotational speed of the drive motor 51 by the encoder 52 of the drive motor 51. The movement control unit 112 also controls the drive of the drive motor 51 using the detection results of the load cell 60. That is, the load cell 60 can detect the pressure acting on the screw 20 when the resin material is measured in the heating barrel 11 or when the resin material is injected from the nozzle 12, so the movement control unit 112 also uses the detection results of the pressure acting on the screw 20 detected by the load cell 60 to control the drive of the drive motor 51. This enables the movement control unit 112 to control the movement of the screw 20 when metering the resin material in the heating barrel 11 and injecting the resin material, while detecting the pressure of the resin material.

[0061] The monitoring data acquisition unit 113 is capable of acquiring monitoring data detected by the injection device 10 when the resin material is melted by the injection device 10. Examples of the monitoring data acquired by the monitoring data acquisition unit 113 include metering time, metering torque, cycle time, screw retreat speed, screw rotation speed, heater power supply rate, resin temperature in the nozzle, resin pressure in the nozzle, current barrel temperature, current nozzle temperature, current below-hopper temperature, pressure holding switch pressure, maximum injection pressure, injection start position, minimum cushion position, and the like.

[0062] Of these monitoring data, the metering time is the metering time when the resin material is metered inside the heating barrel 11, and is obtained by acquiring the driving time of the driving motor 51 when the movement control unit 112 controls the driving motor 51 of the forward / reverse mechanism 50.

[0063] The metering torque is the rotational torque of the screw 20 when the resin material is metered in the heating barrel 11 while rotating the screw 20, and is obtained based on the current value of the driving motor 43 when the driving motor 43 of the rotation mechanism 40 is driven and controlled by the rotation control unit 111.

[0064] The cycle time is the time required for one cycle when the movement control unit 112 controls the movement of the screw 20 in the longitudinal direction Y by controlling the drive of the drive motor 51 of the forward / reverse mechanism 50 during injection molding in the injection molding machine 1, and is obtained from the movement control unit 112.

[0065] The screw retreat speed is obtained by acquiring the movement speed of the screw 20 backward in the longitudinal direction Y when the screw 20 is rotated in the heating barrel 11 and moved backward in the longitudinal direction Y during injection molding in the injection molding machine 1, and the resin material is sent to the front side of the screw 20 while melting the resin material. When acquiring the screw retreat speed in the monitoring data acquisition unit 113, the screw retreat speed is acquired based on the rotation speed of the driving motor 51 detected by the encoder 52 arranged on the driving motor 51 of the forward / reverse mechanism 50. Alternatively, the screw retreat speed may be acquired by calculating the value of the movement distance of the screw 20 backward in the longitudinal direction Y detected based on the detection result of the encoder 52 arranged on the driving motor 51 of the forward / reverse mechanism 50 and the above-mentioned metering time.

[0066] The screw rotation speed is obtained based on the rotation speed of the drive motor 43 by obtaining the detection result of the encoder 44 arranged on the drive motor 43 of the rotation mechanism 40 .

[0067] As described later, the heater power supply rate is the power supply rate for the heater 15 when the temperature control unit 117 controls the temperature of the heater 15 arranged in the heating barrel 11. That is, since the temperature control of the heating barrel 11 is performed by feedback control based on a PID (proportional-integral-derivative) control operation, when the monitoring data acquisition unit 113 acquires the heater power supply rate, the heater power supply rate based on the PID calculation result is acquired from the temperature control unit 117.

[0068] The resin temperature in the nozzle is obtained based on the detection result of a resin temperature sensor 13 arranged in the nozzle 12 arranged at the front end of the heating barrel 11, and is the temperature of the molten resin passing through the nozzle 12.

[0069] The resin pressure in the nozzle is obtained based on the detection result of a resin pressure sensor 14 arranged in the nozzle 12 arranged at the front end of the heating barrel 11, and is the pressure of the molten resin in the nozzle 12.

[0070] The current barrel temperature value is the current temperature at a certain point during one cycle relative to the set temperature of each control zone of the heater 15 of the heating barrel 11, and is obtained, for example, based on the detection result of a temperature sensor (not shown) provided for each heater 15 arranged in the heating barrel 11.

[0071] The current nozzle temperature value is the current temperature at a certain point during one cycle relative to the set temperature of the control zone of the heater 15 of the nozzle 12, and is obtained, for example, based on the detection result of a temperature sensor (not shown) provided on the heater 15 arranged in the nozzle 12.

[0072] The current value of the below-hopper temperature is the current temperature at a certain point during one cycle relative to the set temperature of the barrel temperature control zone located directly below the hopper 18 and within the cooling section 16, and is obtained based on the detection result of the cooling water temperature sensor 202 arranged in the cooling section 16.

[0073] The pressure holding switchover pressure is the resin pressure in the heating barrel 11 when control of the movement of the screw 20 by the encoder 52 attached to the driving motor 51 of the forward / reverse mechanism 50 is switched to control of the movement by the load cell 60 when the molten resin material is injected into the mold 75, and is obtained based on the detection result of the load cell 60 when the movement control is switched.

[0074] The maximum injection pressure is the maximum value of the resin pressure in the heating barrel 11 detected by the load cell 60 when the molten resin material is injected into the mold 75, and is obtained based on the detection result of the load cell 60.

[0075] The injection start position is the position of the screw 20 when the screw 20 starts moving forward when injecting molten resin material into the mold 75, and is obtained based on the detection results of the encoder 52 arranged on the drive motor 51 of the forward / reverse mechanism 50.

[0076] The minimum cushion position is the forward most position of the screw 20 when injecting molten resin material into the mold 75, and is obtained based on the detection results of the encoder 52 arranged on the drive motor 51 of the forward / reverse mechanism 50.

[0077] The monitoring data acquisition unit 113 acquires the monitoring data for each cycle when the injection molding machine 1 molds a molded product, and stores the data in the storage unit 130 of the control device 100.

[0078] The temperature disturbance acquisition unit 114 is capable of acquiring temperature disturbances from the temperature disturbance sensors 200. In this embodiment, the temperature disturbance sensors 200 include an outside air temperature sensor 201, a cooling water temperature sensor 202, an input resin temperature sensor 203, a barrel inner wall temperature sensor 204, and a heater vicinity temperature sensor 205, and the temperature disturbance acquisition unit 114 is capable of acquiring a plurality of types of temperature disturbances by acquiring the detection results of these temperature disturbance sensors 200. The temperature disturbance acquisition unit 114 acquires a plurality of types of temperature disturbances detected by the plurality of temperature disturbance sensors 200 for each cycle when a molded product is molded by the injection molding machine 1, and stores them in the memory unit 130 of the control device 100.

[0079] The molten state estimation unit 115 is capable of estimating a resin molten state, which is a molten state of the resin material in the heating barrel 11, based on the monitoring data acquired by the monitoring data acquisition unit 113.

[0080] The resin molten state referred to here is a value related to the amount of heat received by the resin material, and changes depending on the amount of heat received by the resin material. Examples of the resin molten state include the resin melting start position in the barrel, the resin temperature in the barrel, the resin pressure in the barrel, the resin melting speed in the barrel, and the molten resin viscosity.

[0081] Among these, the in-barrel resin melting start position is the position in the longitudinal direction Y of the portion where the solid resin material starts to melt in the heating barrel 11 when the resin material is melted in the heating barrel 11.

[0082] The resin temperature inside the barrel is the temperature of the resin material at an arbitrary position in the longitudinal direction Y inside the heating barrel 11.

[0083] The resin pressure inside the barrel is the pressure of the resin material at an arbitrary position in the longitudinal direction Y inside the heating barrel 11.

[0084] The resin melting speed in the barrel is the melting speed at which a solid resin material melts at an arbitrary position in the longitudinal direction Y inside the heating barrel 11.

[0085] The viscosity of the molten resin is the viscosity of the resin material molten inside the heating barrel 11 .

[0086] The molten state estimation unit 115 estimates the resin molten state based on the monitoring data acquired by the monitoring data acquisition unit 113. The molten state estimation unit 115 estimates the resin molten state from the monitoring data using a predetermined arithmetic expression. The arithmetic expression for estimating the resin molten state is predetermined and stored in the memory unit 130 of the control device 100.

[0087] Furthermore, in this embodiment, the molten state estimation unit 115 estimates the resin molten state using not only the monitoring data but also the temperature disturbance. That is, the molten state estimation unit 115 estimates the resin molten state based on the monitoring data acquired by the monitoring data acquisition unit 113 and the temperature disturbance acquired by the temperature disturbance acquisition unit 114. That is, the molten state estimation unit 115 estimates the resin molten state based on the monitoring data acquired by the monitoring data acquisition unit 113 and the temperature disturbance acquired by the temperature disturbance acquisition unit 114 using an arithmetic expression stored in the storage unit 130.

[0088] The temperature setting unit 116 sets the temperature of the heaters 15 when melting the resin material in the heating barrel 11, for each heater 15, based on the resin molten state estimated by the molten state estimation unit 115. In other words, a plurality of heaters 15 are arranged in the heating barrel 11, and the temperature setting unit 116 sets the temperature when controlling the temperatures of these plurality of heaters 15, for each heater 15, based on the resin molten state estimated by the molten state estimation unit 115. In other words, the temperature setting unit 116 is capable of setting the temperature for each of a plurality of control zones set in the heating barrel 11.

[0089] The temperature control unit 117 controls the temperature of each of the heaters 15 arranged in the heating barrel 11 based on the temperature setting performed for each heater 15 by the temperature setting unit 116. The temperature control unit 117 controls the temperature of each of the heaters 15 by feedback control based on a PID control operation.

[0090] <Action of injection molding machine 1> The injection molding machine 1 according to this embodiment includes the above-mentioned configuration, and its operation will be described below. The injection molding machine 1 performs one injection and molding operation as one cycle, and repeatedly executes this injection and molding operation cycle. Each cycle includes a plurality of processes for injecting the molding material and molding the product. Each cycle includes, for example, a mold closing process, a filling process, a pressure holding process, a measuring process, a mold opening process, and a removal process.

[0091] The mold closing process is a process in which the movable platen 72 of the mold clamping device 70 is moved in a direction approaching the fixed platen 71, thereby combining the movable mold 77 and the fixed mold 76 and forming a cavity 75a corresponding to the product shape between the movable mold 77 and the fixed mold 76.

[0092] The filling process is a process in which molten resin, which is a resin material melted by the heated barrel 11 of the injection device 10, is injected into a cavity 75a formed by a movable mold 77 and a fixed mold 76 attached to the mold clamping device 70.

[0093] The pressure holding process is a process in which the pressure of the molding resin, which is the resin material injected into the cavity 75a formed by the movable mold 77 and the fixed mold 76 attached to the mold clamping device 70, is maintained, and the process waits for a certain period of time until the molding resin becomes a molded product as its temperature drops and it solidifies.

[0094] The metering step is a step of feeding the resin material to be injected in the next cycle to the end side of the heating barrel 11 of the injection device 10 where the nozzle 12 is located, thereby preparing the resin material to be used in the next cycle.

[0095] The mold opening process is a process in which the movable platen 72 is moved away from the fixed platen 71 and the movable mold 77 is moved away from the fixed mold 76 in order to remove the molded product formed by the fixed mold 76 and the movable mold 77 attached to the mold clamping device 70.

[0096] The removal process is a process in which, after the movable die 77 is separated from the fixed die 76, the molded product attached to the movable die 77 is pushed out by the push-out member 86 of the push-out mechanism 85, thereby removing the molded product from the die 75.

[0097] When molding a molded product with the injection molding machine 1, these injection and molding operation cycles are repeatedly performed, and during this repeated cycle, the injection molding machine 1 continuously melts the resin material, which is supplied in a solid state into the heating barrel 11, within the heating barrel 11.

[0098] The resin material in the heating barrel 11 is melted by controlling the heaters 15 arranged in the heating barrel 11 with a temperature control unit 117 included in the processing unit 110 of the control device 100, and by causing the heaters 15 to generate heat, the temperature of the resin material in the heating barrel 11 is increased. At this time, the temperature control unit 117 controls the temperature of each of the heaters 15, of which a plurality are arranged in the heating barrel 11. As a result, the temperature control unit 117 controls the temperature for each control zone of the heating barrel 11, and adjusts the temperature at each position in the longitudinal direction Y of the heating barrel 11 to a temperature appropriate for that position.

[0099] Specifically, the temperature of the heating barrel 11 is controlled so that it increases from the side where the hopper 18 that supplies the solid resin material into the heating barrel 11 is located to the side where the nozzle 12 that injects the molten resin material out of the heating barrel 11 is located. As a result, the resin material that is supplied into the heating barrel 11 in the form of solid pellets is heated while being sent by the rotating screw 20 from the side where the hopper 18 is located in the longitudinal direction Y to the side where the nozzle 12 is located, and is melted while moving inside the heating barrel 11 to the side where the nozzle 12 is located.

[0100] In the heating barrel 11, the screw 20 rotating in this manner sends the resin material from the side where the hopper 18 is located to the side where the nozzle 12 is located, and the resin material is sent to the side where the nozzle 12 is located by the rotation of the screw 20 on which the flights 21 formed in a spiral are arranged. At that time, the resin material is kneaded by the flights 21 arranged on the screw 20 while being sent in the longitudinal direction Y in the heating barrel 11. For this reason, frictional heat due to friction between the resin materials and shear heat due to the shearing of the molten resin material are generated in the resin material, and the temperature of the resin material increases not only due to the heat generated by the heater 15 but also due to heat generated by the movement of the resin material.

[0101] The temperature of the resin material also rises due to shear heat of the resin material, and the amount of heat generated at that time also melts the resin material, but since the amount of heat generated by shear heat depends on the physical properties of the resin material and the supply status of the pellets, it is difficult to control the amount of heat generated by shear heat, etc. The temperature inside the heating barrel 11 is adjusted by controlling the heater 15, but if the temperature inside the heating barrel 11 is inappropriate for melting the resin material due to the influence of shear heat of the resin material, etc., there is a possibility that molding defects will occur and production will become unstable due to insufficient or excessive heat of the resin material to be melted.

[0102] In Patent Document 1, the temperature of zone Z4 closest to the nozzle of the heating cylinder main body is set by an operator inputting a set temperature, and the temperatures of the other zones Z3, Z2, and Z1 are calculated based on the molding conditions and set automatically. However, even if the set temperature of each zone is calculated based on the molding conditions, the shear heat generated by kneading the resin material with the screw 20 may change when the resin material is melted depending on the pellet supply situation, etc. For this reason, the actual temperature of the resin material may change from the desired temperature due to the influence of the shear heat, etc., and it may be difficult to maintain the temperature of the resin material at a temperature appropriate for melting the resin material.

[0103] In contrast, in the injection molding machine 1 according to this embodiment, the resin molten state is estimated based on monitoring data while the resin material is being melted to form a molded product, and the temperature of the heater 15 is set based on the estimated resin molten state. This makes it possible to maintain the temperature of the resin material at a temperature suitable for melting. Next, the temperature control of the heating barrel 11 in the injection molding machine 1 according to this embodiment will be described.

[0104] <Temperature control of heating barrel 11> In the injection molding machine 1 of the embodiment, the temperature setting of the tip of the heated barrel 11 is performed based on input from outside the injection device 10, and the temperature setting of positions other than the tip of the heated barrel 11 is automatically performed by the control device 100 based on monitoring data.

[0105] The temperature setting of the tip of the heating barrel 11, i.e., the temperature setting of the control zone H1 (see FIG. 3) in the heating barrel 11, is performed by an operator's input operation to the input / output unit 140. The temperature of the control zone H1 is acquired by the temperature setting unit 116 of the processing unit 110 of the control device 100 when the operator inputs, for example, a temperature recommended for the type of resin material to the input / output unit 140.

[0106] The temperature setting unit 116 sets the temperature input as the temperature of the control zone H1 as the temperature of the heater 15 arranged in the control zone H1. When the injection molding machine 1 is in operation, the temperature control unit 117 included in the processing unit 110 of the control device 100 controls the heater 15 arranged in the control zone H1 at the temperature set by the temperature setting unit 116, thereby controlling the temperature of the control zone H1.

[0107] On the other hand, the temperature setting of the parts other than the tip of the heating barrel 11, i.e., the temperature setting of the control zones H2 to H4 (see FIG. 3) in the heating barrel 11, is automatically set with an arbitrary temperature gradient when the temperature of the control zone H1 is set. In other words, when the temperature of the control zone H1 is set by an input operation by the operator, the temperature control unit 117 sets the temperatures of the control zones H2 to H4 with an arbitrary temperature gradient based on the set temperature of the control zone H1. In this case, the temperature gradient may be set by an input operation by the operator to the input / output unit 140, as in the case of the control zone H1, or the temperature gradient may be set in advance and stored in the storage unit 130, and the temperature setting of the control zones H2 to H4 may be performed using the temperature gradient stored in the storage unit 130.

[0108] After the temperature setting unit 116 sets the temperature of each control zone, the temperature of the heater 15 is controlled to the set temperature by the temperature control unit 117 of the processing unit 110 of the control device 100 while the injection molding machine 1 molds the molded product. The injection molding machine 1 produces molded products continuously by repeating the above-mentioned cycle.

[0109] In the control device 100 of the injection molding machine 1, while molding a molded product, the monitoring data acquisition unit 113 in the processing unit 110 acquires monitoring data, and the temperature disturbance acquisition unit 114 acquires temperature disturbance.

[0110] The monitoring data acquisition unit 113, which acquires monitoring data during operation of the injection molding machine 1, acquires, as monitoring data, for example, metering time, metering torque, cycle time, screw retreat speed, screw rotation speed, heater power supply rate, resin temperature in the nozzle, resin pressure in the nozzle, etc. Also, the temperature disturbance acquisition unit 114, which acquires temperature disturbance during operation of the injection molding machine 1, acquires, as temperature disturbance, for example, outside air temperature, cooling water temperature, input resin temperature, barrel inner wall temperature, temperature near the heater, etc.

[0111] After the monitoring data acquisition unit 113 acquires the monitoring data and the temperature disturbance acquisition unit 114 acquires the temperature disturbance, the melted state of the resin, which is the melted state of the resin material in the heating barrel 11, is estimated by the melted state estimation unit 115 of the processing unit 110 of the control device 100. The melted state estimation unit 115 estimates the resin melted state based on the monitoring data acquired by the monitoring data acquisition unit 113 and the temperature disturbance acquired by the temperature disturbance acquisition unit 114. Note that although some resin melted states can be estimated without using the temperature acquired by the temperature disturbance acquisition unit 114, it is preferable to use the temperature acquired by the temperature disturbance acquisition unit 114 since the accuracy of the estimation is improved by using the temperature acquired by the temperature disturbance acquisition unit 114.

[0112] The molten state estimation unit 115 acquires, as the molten state of the resin, for example, the position at which the resin melting starts inside the barrel, the resin temperature inside the barrel at an arbitrary position inside the heated barrel 11, the resin pressure inside the barrel at an arbitrary position inside the heated barrel 11, the resin melting speed inside the barrel at an arbitrary position inside the heated barrel 11, the viscosity of the molten resin, etc.

[0113] The melted state estimation unit 115 estimates these resin melted states from the monitoring data and temperature disturbances using a predetermined calculation formula stored in the storage unit 130. The calculation formula used to estimate the resin melted state is an application of the resin melting theory of extruders proposed by Tadmor to the injection molding machine 1. Of the resin melted states estimated by the melted state estimation unit 115, the resin melting start position in the barrel is estimated using, for example, the following formula (1).

[0114]

number

[0115] In formula (1), X is the solid bed width, which is the width in the longitudinal direction Y of the resin material in a solid state that enters between adjacent portions in the longitudinal direction Y at the same position in the circumferential direction of the screw 20 on the flight 21 of the screw 20. W is the interval between adjacent portions in the longitudinal direction Y at the same position in the circumferential direction of the screw 20 on the flight 21 of the screw 20. Ψ is a function of the melting speed of the resin material, and is represented by w in formula (4) described later. L It is (z).

[0116] H is the height of the flight 21 of the screw 20 in the radial direction of the screw 20. A is the gradient of the height of the flight 21, which is expressed by the height of each of the flights 21 at the upstream end and downstream end in the range in which the resin material is transported in the axial direction of the screw 20, and the distance between these in the axial direction of the screw 20. A Z is the gradient of the height of the flight 21 expressed as a distance in the axial direction of the screw 20.

[0117] In formula (1), monitoring data such as metering time, cycle time, screw retreat speed, heater current ratio, and metering torque are used from among the monitoring data acquired by the monitoring data acquisition unit 113. In addition, among the values ​​used in formula (1), the interval W of the flights 21 in the longitudinal direction Y, the height H of the flights 21, and the gradient A of the height of the flights 21 are used. Z The value stored in the storage unit 130 is used for Ψ in the formula (1). L (z), and in equation (4), w L Therefore, the formula (1) is a formula for estimating the resin melting start position in the barrel using the monitoring data acquired by the monitoring data acquisition unit 113 and the temperature disturbance acquired by the temperature disturbance acquisition unit 114.

[0118] The melting start position of the resin material in the barrel is the position where X / W<1 as a result of calculation using formula (1) indicates the melting start position of the resin material in the heating barrel 11. The melted state estimation unit 115 uses the melting start position of the resin material in the heating barrel 11 calculated in this manner as the resin melted state.

[0119] Among the resin molten state estimated by the molten state estimation unit 115, the resin pressure inside the barrel at an arbitrary position inside the heating barrel 11 is estimated by using, for example, the following formula (2).

[0120]

number

[0121] In formula (2), ΔP is the pressure change of the resin material from the position where the hopper 18 is located in the heating barrel 11. N is the rotation speed of the screw 20. D b is the inner diameter of the heating barrel 11. W is the distance between adjacent portions of the flights 21 of the screw 20 that are located at the same position in the circumferential direction of the screw 20 and are adjacent to each other in the longitudinal direction Y. δ f is a gap between the inner circumferential surface of the heating barrel 11 and the flight 21. H is the height of the flight 21 of the screw 20 in the radial direction of the screw 20.

[0122] K is the outlet coefficient. The outlet coefficient here is a shape representation of the pressure loss at the resin outlet, which is the flow path at the tip of the nozzle 12. F d is the shape factor of the drag flow. The shape factor of the drag flow here is the amount of reduction in the drag flow at the resin outlet expressed by the flow path shape. F p is the shape factor of the pressure flow. The shape factor of the pressure flow here is the amount of pressure flow reduction at the resin outlet expressed by the flow path shape. f Lis the leakage coefficient of the pressure flow. The leakage coefficient of the pressure flow here is a coefficient that represents the ratio of the amount of resin that flows back to the hopper 18 side from the gap between the outer periphery of the check ring 25 arranged on the screw 20 or the outer periphery of the flight 21 and the inner periphery of the heating barrel 11. b is the helix angle of the flight 21 on the inner peripheral surface of the heating barrel 11, and is the angle when the helix of the outer peripheral portion of the flight 21 of the screw 20 is projected onto the inner peripheral surface of the heating barrel 11. θ is the angle of the helix itself of the flight 21 of the screw 20. That is, when the flight 21 is viewed in the height direction of the flight 21, the helix angle θ of the flight 21 changes depending on the R processing of the portion that is the root of the flight 21. L is the length of the screw 20 in the longitudinal direction Y.

[0123] In formula (2), the rotation speed of the screw 20 is used from among the monitoring data acquired by the monitoring data acquisition unit 113. In addition, among the values ​​used in formula (2), the inner diameter D b the spacing W of the flights 21 in the longitudinal direction Y, and the gap δ between the inner circumferential surface of the heating barrel 11 and the flights 21. f , the height H of the flight 21, and the helical angle θ of the flight 21 projected onto the inner circumferential surface of the heating barrel 11. b For the helical angle θ of the flight 21, the value stored in the memory unit 130 is used.

[0124] Regarding the resin pressure inside the barrel, ΔP calculated by the formula (2) is estimated as the pressure of the resin material at an arbitrary position inside the heating barrel 11. The molten state estimation unit 115 uses the pressure of the resin material at an arbitrary position inside the heating barrel 11 calculated in this manner as the resin molten state.

[0125] Among the resin molten states estimated by the molten state estimation unit 115, the resin temperature inside the barrel at an arbitrary position inside the heating barrel 11 is estimated, for example, by using the following formula (3).

[0126]

number

[0127] In formula (3), ΔT is the temperature change of the resin material from the position where the hopper 18 is located in the heating barrel 11. p is the specific heat of the resin when the pressure of the resin material is constant. E v is the heat conversion ratio of kinetic energy. The heat conversion ratio of kinetic energy here is the ratio of kinetic energy that is converted into heat energy when the kinetic energy applied to molten resin is converted into two, resin deformation and heat energy. ρ is the density of the molten resin material. Q is the mass flow rate of the molten resin material, and is expressed by w in equation (4) described later. L It is calculated using (z).

[0128] In formula (3), monitoring data such as metering time, cycle time, screw retreat speed, heater current ratio, barrel temperature, and metering torque are used among the monitoring data acquired by the monitoring data acquisition unit 113. Also, Q in formula (3) is expressed by w L (z), and in equation (4), w is calculated using the temperature disturbance acquired by the temperature disturbance acquisition unit 114. L Therefore, the formula (3) is a formula for estimating the resin temperature in the barrel using the monitoring data acquired by the monitoring data acquisition unit 113 and the temperature disturbance acquired by the temperature disturbance acquisition unit 114.

[0129] Regarding the resin temperature inside the barrel, ΔT calculated by the formula (3) is estimated as the temperature of the resin material at an arbitrary position inside the heating barrel 11. The molten state estimation unit 115 uses the temperature of the resin material at an arbitrary position inside the heating barrel 11 calculated in this manner as the resin molten state.

[0130] Among the resin molten states estimated by the molten state estimation unit 115, the resin melting speed in the barrel at an arbitrary position in the heating barrel 11 is estimated by using, for example, the following formula (4).

[0131]

number

[0132] In equation (4), w L (z) is the melting speed of the resin in the heating barrel 11 at an arbitrary position in the barrel. bx is the groove crossing velocity component of the barrel section velocity. To explain the groove crossing velocity component of the barrel section velocity, since the flights 21 of the screw 20 are formed in a spiral shape, the flow path in the screw 20 through which the resin flows is inclined with respect to the rotation direction of the screw 20, but the groove crossing velocity component of the barrel section velocity refers to the speed when the rotation speed of the screw 20 is expanded in the groove width direction of the flow path through which the resin flows, that is, in the groove width direction of the grooves partitioned by the flights 21. j is the relative velocity between the heating barrel 11 and the solid bed which is the resin material in a solid state. X is the width of the solid bed. Θ ave is a dimensionless temperature. T b is at the temperature inside the heating barrel 11.

[0133] T m is the melting point of the resin material. s0 is the temperature of the solid resin material. m is the density of the molten resin material. m is the thermal conductivity of the molten resin. μ is the viscosity of the molten resin material. λ is the heat of fusion of the resin material. C s is the specific heat of the solid resin material. m is the specific heat of the molten resin material.

[0134] In formula (4), monitoring data such as metering time, cycle time, screw retreat speed, heater current ratio, barrel temperature, and metering torque are used among the monitoring data acquired by the monitoring data acquisition unit 113. In addition, among the values ​​used in formula (4), the temperature T bis detected by the barrel inner wall temperature sensor 204, acquired by the temperature disturbance acquisition unit 114, and stored in the storage unit 130. s0 is detected by the input resin temperature sensor 203, acquired by the temperature disturbance acquisition unit 114, and stored in the storage unit 130.

[0135] The molten state estimation unit 115 uses the thus calculated resin melting speed in the barrel at an arbitrary position in the heating barrel 11 as the resin molten state. That is, the molten state estimation unit 115 estimates the resin molten state based on the monitoring data acquired by the monitoring data acquisition unit 113 and the temperature disturbance acquired by the temperature disturbance acquisition unit 114.

[0136] The temperature setting unit 116 included in the control device 100 sets the temperature for each heater 15 based on the resin molten state estimated by the molten state estimation unit 115 in this manner.

[0137] The temperature setting of the heaters 15 performed by the temperature setting unit 116 based on the resin molten state is determined to be due to an excess, shortage, or instability of the amount of heat if the estimated resin molten state exceeds a threshold value, and the temperature is set for each heater 15 so that the resin molten state is within the threshold range.

[0138] The threshold value of the resin molten state is set as an upper limit and a lower limit for the value of the resin molten state when the amount of heat given to the resin material when melting in the heating barrel 11 is appropriate. For example, when the above-mentioned formula (1) for estimating the resin melting start position in the barrel, formula (2) for estimating the resin pressure in the barrel at an arbitrary position in the heating barrel 11, formula (3) for estimating the resin temperature in the barrel at an arbitrary position in the heating barrel 11, formula (4) for estimating the resin melting speed in the barrel at an arbitrary position in the heating barrel 11, or the like is used to estimate the resin molten state, the upper limit and the lower limit for the value calculated from these formulas when the amount of heat given to the resin material when melting in the heating barrel 11 is appropriate are set as the threshold value. That is, for example, if the values ​​calculated from these formulas are expressed as indexes with a value of 100 being the appropriate amount of heat given to the resin material when it is melted in the heating barrel 11, and the threshold value of the molten resin state is set to ±10% of the value when the amount of heat is appropriate, then when the index of the value calculated from the above formula is 90 or more and 110 or less, the value of the molten resin state is determined to be within the threshold range, and when the index is less than 90 or more than 110, the value of the molten resin state is determined to be outside the threshold range. The threshold values ​​of the molten resin state set in this manner are set in advance for each formula used to estimate the molten resin state, and are stored in the storage unit 130.

[0139] When the resin molten state estimated by the molten state estimation unit 115 exceeds the threshold value of the resin molten state set in this manner, the temperature setting unit 116 performs a back calculation of the resin molten state, thereby setting the temperature of the heater 15 so that the resin molten state falls within the range of the threshold value. That is, for example, when the resin molten state estimated using the above-mentioned formulas (1) to (4) exceeds the threshold value, the temperature setting unit 116 sets the temperature of the heater 15 so that the resin molten state falls within the range of the threshold value, by setting the monitoring data other than the barrel temperature as fixed values ​​and using the barrel temperature as a variable to perform a back calculation of the formula used to estimate the resin molten state, thereby calculating a barrel temperature at which the value of the resin molten state falls within the threshold value. Based on the barrel temperatures calculated in this manner, the temperature setting unit 116 sets the temperature for each heater 15 so that the calculated barrel temperature can be realized.

[0140] Furthermore, the temperature setting unit 116 sets the temperature of the heater 15 based not only on the resin molten state but also on monitoring data and temperature disturbance. The temperature setting of the heater 15 performed by the temperature setting unit 116 based on the monitoring data and temperature disturbance determines that the amount of heat is excessive, insufficient, or unstable when the monitoring data or temperature disturbance exceeds its respective threshold value. In this case, the temperature is set for each heater 15 so that the resin molten state is within the threshold range.

[0141] Whether or not the resin molten state, the monitoring data, and the temperature disturbance exceed the threshold value is determined for each cycle. The threshold values ​​for the resin molten state, the monitoring data, and the temperature disturbance are preset for each type of resin molten state, each type of monitoring data, and each type of temperature disturbance, and are stored in the storage unit 130.

[0142] The temperature control section 117 of the processing section 110 of the control device 100 controls each heater 15 at the temperature thus set, thereby controlling the temperature for each control zone. As a result, the temperature of each control zone of the heating barrel 11 is set appropriately for each control zone, and molding of the molded product continues with the right amount of heat for the resin material being neither too much nor too little.

[0143] Next, the control procedure when molding a molded product with the injection molding machine 1 while setting the temperature of the heating barrel 11 as described above will be described with reference to a flowchart. Fig. 6 is a flow diagram showing the control procedure when molding is performed with the injection molding machine 1 according to the embodiment. Note that the flowchart shown in Fig. 6 shows the control procedure when estimating the resin melting start position in the barrel as an example of the resin melting state estimated by the melting state estimation unit 115 of the processing unit 110 of the control device 100.

[0144] When molding a molded product with the injection molding machine 1, first, an operator inputs the temperature setting for the control zone H1 (step ST11). For the temperature setting for H1, for example, the operator inputs the recommended temperature for the material resin to be used through the input / output unit 140, and the temperature setting is stored in the storage unit 130.

[0145] Next, the temperature settings of the control zones other than H1 are automatically input (step ST12). The temperatures of the control zones other than H1 are set, for example, by the temperature setting unit 116 of the processing unit 110 of the control device 100 with the temperature of H1 as a reference, along a temperature gradient that is predetermined and stored in the storage unit 130. The temperatures of the control zones other than H1 that are set by the temperature setting unit 116 are input by being stored in the storage unit 130.

[0146] After the temperature settings for each control zone have been input, production of a molded product is started in the injection molding machine 1 (step ST13). That is, the resin material is melted in the heating barrel 11 while controlling the temperatures of the multiple heaters 15 by the temperature control unit 117 of the processing unit 110 of the control device 100 in accordance with the temperature settings for each control zone stored in the memory unit 130, thereby producing a molded product.

[0147] When production of a molded product is started by the injection molding machine 1, monitoring data and temperature disturbance during molding of the molded product by the injection molding machine 1 are acquired (step ST14). Monitoring data of the injection molding machine 1 during molding of the molded product is acquired by a monitoring data acquisition unit 113 possessed by the processing unit 110 of the control device 100, and stored in the memory unit 130. In addition, temperature disturbance during molding of the molded product is acquired by a temperature disturbance acquisition unit 114 possessed by the processing unit 110 of the control device 100, and stored in the memory unit 130.

[0148] After acquiring the monitoring data and the temperature disturbance, the resin melting start position in the barrel, which is the resin molten state, is calculated (step ST15). The resin melting start position in the barrel is calculated by the molten state estimation unit 115 of the processing unit 110 of the control device 100 based on the acquired monitoring data and the temperature disturbance. The resin melting start position in the barrel is calculated, for example, using the above-mentioned formula (1) which is stored in advance in the storage unit 130. The resin melting start position in the barrel calculated by the molten state estimation unit 115 is stored in the storage unit 130.

[0149] Next, it is determined whether the monitoring data, the temperature disturbance, and the resin melting start position in the barrel, which is the resin molten state, are within the thresholds (step ST16). This determination is performed by the temperature setting unit 116 of the processing unit 110 of the control device 100. The temperature setting unit 116 compares the monitoring data, the temperature disturbance, and the resin melting start position in the barrel, which is the resin molten state, with the thresholds set for each, and determines whether they are within the thresholds.

[0150] If it is determined by the temperature setting unit 116 that the monitoring data, the temperature disturbance, and the resin melting start position in the barrel are all within the thresholds (step ST16: Yes determination), production is continued (step ST17). That is, the injection molding machine 1 continues molding the molded product without changing the temperature setting when controlling the heater 15. The injection molding machine 1 acquires the monitoring data and the temperature disturbance while continuing the production of the molded product in this way (step ST14).

[0151] On the other hand, if the temperature setting unit 116 determines that at least one of the monitoring data, the temperature disturbance, and the resin melting start position in the barrel exceeds the threshold (step ST16: No determination), a barrel temperature setting other than H1 that keeps the resin melting start position in the barrel within the threshold is calculated (step ST18). In this case, the calculation of the barrel temperature setting other than H1 is performed by the temperature setting unit 116, by setting the temperature of a control zone other than H1 that can keep the resin melting start position in the barrel within the threshold, while taking into account the current resin melting start position in the barrel. As a result, the temperature setting unit 116 changes the temperature setting of at least one of the heaters 15 arranged in the control zone other than H1.

[0152] Once the temperature settings for the control zones other than H1 have been calculated, the barrel temperature settings other than H1 are automatically changed (step ST19). That is, the heaters 15 arranged in the control zones other than H1 are temperature-controlled by the temperature control unit 117 at the temperature settings calculated by the temperature setting unit 116. Once the barrel temperature settings other than H1 have been changed, production of molded products is continued at the changed temperature settings (step ST17).

[0153] In this way, the injection molding machine 1 of this embodiment calculates the resin molten state, such as the resin melting start position in the barrel, when molding a molded product, and when at least one of the monitoring data, temperature disturbance, and resin melting start position in the barrel exceeds a threshold value, the temperature settings of the control zones other than H1 are changed to adjust the temperature of the resin material to a temperature suitable for melting the resin material, thereby melting the resin material.

[0154] <Simulation of automatic barrel temperature setting change> Next, a description will be given of the simulation results when the barrel temperature setting is automatically changed according to the above-mentioned procedure. Fig. 7 is a diagram showing the simulation results when the barrel temperature setting is automatically changed. The simulation shown in Fig. 7 shows the simulation results when three control zones H1, H2, and H3 are set as the control zones, the size of the screw 20 is φ45 mm, polyethylene is used as the resin material, and the melted resin start position in the barrel is estimated as the melted resin state estimated by the melted state estimation unit 115.

[0155] In the simulation shown in Fig. 7, the temperature setting of control zone H1 is set to 200°C, and control zones H2 and H3 are set to H2 = 180°C and H3 = 160°C according to a temperature gradient based on H1, and continuous molding of molded products is started in this state. Note that in Fig. 7, HOP is the temperature of the inlet of the resin material in the heating barrel 11.

[0156] Furthermore, the simulation shown in Fig. 7 assumes that the temperature of the resin input at the start of molding is 80°C due to preheating, but the temperature of the resin input drops to 20°C from the 10th cycle onwards.

[0157] 7 is an example of a resin melting state calculated from monitoring data acquired from the injection molding machine 1 during molding of a molded product, and is the resin melting start position in the barrel. The melting start position is the distance in the longitudinal direction Y from the inlet for the resin material into the heating barrel 11, that is, the distance from the position of the hopper 18 toward the front in the longitudinal direction Y.

[0158] In the simulation results shown in Fig. 7, the amount of heat applied to the resin material in the heating barrel 11 decreases and the melting start position increases as the temperature of the charged resin decreases after the 10th cycle. That is, the resin material in the heating barrel 11 becomes difficult to melt due to the decrease in the temperature of the charged resin after the 10th cycle, and the melting start position moves to the downstream side, where the nozzle 12 is located, in the longitudinal direction Y. If molding of the molded product is continued in this state, there is concern that the melted state of the resin in the heating barrel 11 will change, causing problems such as a change in the metering time, generation of unmelted resin, and an increase in shear heat causing the temperature of the control zone H1 to exceed the set temperature and become uncontrolled.

[0159] When the melting start position exceeds the threshold value due to the movement of the melting start position downstream, the temperature setting unit 116 of the processing unit 110 of the control device 100 calculates barrel temperature settings other than H1 in order to return the melting start position to within the threshold value. In the simulation results shown in FIG. 7, the temperature setting unit 116 calculated the temperature settings of the control zones H2 and H3 as H2=182°C and H3=164°C. The new temperature settings of the control zones H2 and H3 were applied from the 19th cycle onwards, and the melting start position became smaller from the 19th cycle onwards. As a result, it was confirmed that the melting start position returned to its original position from the 19th cycle onwards when the new temperature settings of the control zones H2 and H3 were made.

[0160] As is clear from the above simulation results, when the resin molten state estimated by calculating the resin melting start position in the barrel or the like exceeds the threshold, the resin molten state in the heating barrel 11 can be kept constant by calculating a barrel temperature setting other than H1 at which the resin molten state falls within the threshold and changing the barrel temperature setting other than H1. This enables stable continuous molding even when disturbance such as a change in the input resin temperature occurs.

[0161] <Effects of the embodiment> In the injection molding machine 1 according to the above embodiment, the melted state estimation unit 115 estimates the resin melted state in the heating barrel 11 based on the monitoring data acquired by the monitoring data acquisition unit 113, and the temperature setting unit 116 sets the temperature of the heater 15 for each heater 15 based on the estimated resin melted state. As a result, even if shear heat or the like occurs in the resin material melting in the heating barrel 11 and the resin material receives a heat amount other than the heat amount of the heater 15, the temperature of the resin material in the heating barrel 11 can be set to a temperature at which the resin melted state is appropriate by setting the temperature of the heater 15 based on the estimated resin melted state. As a result, the temperature setting when melting the resin can be more appropriately performed, and molding defects due to insufficient or excessive heat of the melting resin material can be suppressed.

[0162] In addition, the apparatus includes a temperature disturbance acquisition unit 114 that acquires a temperature disturbance from the temperature disturbance sensor 200, and the melted state estimation unit 115 estimates the resin molten state based on the monitoring data acquired by the monitoring data acquisition unit 113 and the temperature disturbance acquired by the temperature disturbance acquisition unit 114, so that the resin molten state can be estimated with higher accuracy. This allows the temperature setting of the heater 15, which is performed based on the estimated resin molten state, to be performed with high accuracy taking the resin molten state into consideration. As a result, the temperature setting when melting the resin can be performed more appropriately.

[0163] Furthermore, the temperature setting unit 116 changes the temperature setting of the heater 15 when at least one of the monitoring data, the temperature disturbance, and the resin molten state exceeds a threshold value, so that in a situation where the resin molten state is inappropriate for molding a molded product, the temperature setting of the heater 15 is changed, thereby making it possible to make the resin molten state suitable for molding a molded product. As a result, the temperature setting when melting the resin can be made more appropriate.

[0164] Furthermore, since the melted state estimation unit 115 estimates the resin melted state from the monitoring data using a predetermined calculation formula, the resin melted state in the heating barrel 11 can be easily estimated with high accuracy. This allows the temperature of the heater 15 to be set with high accuracy based on the resin melted state, and the resin melted state can be made suitable for molding a molded product. As a result, the temperature can be set more appropriately when melting the resin.

[0165] In addition, the temperature setting unit 116 sets the temperature of the tip of the heating barrel 11 based on an input from outside the injection device 10, so that the temperature setting that serves as the reference for the temperature control of the multiple heaters 15 can be appropriately set. That is, since the temperature setting of the tip of the heating barrel 11 is the final target temperature of the resin material to be melted, by setting the temperature of the tip based on an input from outside, the final target temperature of the resin material can be easily and appropriately obtained regardless of the type and physical properties of the resin material. Therefore, the resin material in the heating barrel 11 can be appropriately melted regardless of the type and physical properties of the resin material. As a result, the temperature setting when melting the resin can be more appropriately set.

[0166] [Variations] In the above embodiment, the control zone H1 set at the tip of the heated barrel 11 does not include the nozzle 12, but the control zone H1 set at the tip of the heated barrel 11 may include the nozzle 12 or may only include the nozzle 12. That is, when the temperature setting unit 116 sets the temperature of the tip of the heated barrel 11 based on an input from outside the injection device 10, the temperature setting may be set for a range including the nozzle 12 or for only the nozzle 12.

[0167] In the above embodiment, when the temperature setting of H1, which is the control zone set at the tip of the heated barrel 11, is performed based on an input from outside the injection device 10, the temperature setting of H1 is performed by an input operation of the operator to the input / output unit 140, but the temperature setting of H1 may be performed by a method other than the input operation of the operator. For example, a flow analysis of the resin material may be performed using an application program that performs a flow analysis of the molten resin material in the cavity 75a of the mold 75, and the temperature setting of the control zone H1 set at the tip of the heated barrel 11 may be performed based on a temperature suitable for the temperature of the resin material at the tip of the heated barrel 11, which is derived from the flow analysis. [Explanation of symbols]

[0168] 1...injection molding machine, 5...frame, 10...injection device, 11...heating barrel, 12...nozzle, 13...resin temperature sensor, 14...resin pressure sensor, 15...heater, 16...cooling section, 18...hopper, 20...screw, 21...flight, 22...groove section, 23...groove wall, 24...connecting section, 25...check ring, 30...propulsion mechanism, 31...driving motor, 40...rotation mechanism, 41...rotation mechanism main body, 43...driving motor, 44...encoder, 45...transmission belt, 46...pulley, 47...bearing, 50...forward / reverse mechanism, 51...driving motor, 52...encoder, 53...transmission belt, 54...pulley, 56...ball screw mechanism, 57...screw section, 58...nut section, 60...load cell, 70...mold clamping device , 71... fixed platen, 72... movable platen, 75... mold, 75a... cavity, 76... fixed mold, 77... movable mold, 80... mold clamping drive mechanism, 81... toggle mechanism, 85... extrusion mechanism, 86... extrusion member, 100... control device, 110... processing unit, 111... rotation control unit, 112... movement control unit, 113... monitoring data acquisition unit, 114... temperature disturbance acquisition unit, 115... molten state estimation unit, 116... temperature setting unit, 117... temperature control unit, 130... memory unit, 140... input / output unit, 150... input unit, 160... display unit, 200... temperature disturbance sensor, 201... outside air temperature sensor, 202... cooling water temperature sensor, 203... input resin temperature sensor, 204... barrel inner wall temperature sensor, 205... heater vicinity temperature sensor

Claims

1. an injection device that melts a resin material in a heating barrel having a screw disposed inside, and injects the resin material from a nozzle by moving the screw toward a side where a nozzle for injecting the molten resin material is located; a heater arranged in a longitudinal direction of the heating barrel and configured to heat the resin material in the heating barrel; a temperature control unit that controls a temperature of each of the heaters arranged in the heating barrel; a monitoring data acquisition unit that acquires monitoring data detected by the injection device when the resin material is melted by the injection device; a molten state estimation unit that estimates a molten state of the resin material in the heating barrel based on the monitoring data acquired by the monitoring data acquisition unit; and a temperature setting unit that sets a temperature for each heater when the temperature control unit controls the temperature of the heater based on the resin molten state estimated by the molten state estimation unit; An injection molding machine comprising:

2. a temperature disturbance sensor for detecting a temperature disturbance occurring when the resin material is melted by the injection device; a temperature disturbance acquisition unit that acquires the temperature disturbance from the temperature disturbance sensor; Equipped with 2 . The injection molding machine according to claim 1 , wherein the molten state estimation unit estimates the molten state of the resin based on the monitoring data acquired by the monitoring data acquisition unit and the temperature disturbance acquired by the temperature disturbance acquisition unit.

3. 3. The injection molding machine according to claim 2, wherein the temperature setting unit changes the temperature setting of the heater when at least one of the monitoring data, the temperature disturbance, and the resin molten state exceeds a threshold value.

4. 3. The injection molding machine according to claim 1, wherein the molten state estimation unit estimates the molten state of the resin from the monitoring data using a predetermined arithmetic expression.

5. 3. The injection molding machine according to claim 1, wherein the temperature setting unit sets the temperature of the tip end of the heating barrel, which is an end on a side where the nozzle is located, based on an input from outside the injection device.

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