Injection molding machine

Abstract

The present invention provides a technique capable of improving the positional accuracy of the nozzle of an injection device. An injection molding machine includes an injection device and a guiding portion. The injection device includes a nozzle for injecting a molding material into a mold device. The guiding portion guides the injection device in a direction in which the nozzle contacts and separates from the mold device.

Description

Technical Field

[0001] This application claims priority based on Japanese Patent Application No. 2021-052166 filed on March 25, 2021. The entire contents of the Japanese application are incorporated herein by reference.

[0002] The present invention relates to an injection molding machine. Background Art

[0003] The injection molding mechanism of Patent Document 1 is configured such that the injection unit main body can be adjusted in a manner that eliminates a slight deviation between the mold centering hole and the nozzle and enables accurate centering. When adjusting the axis of the nozzle in the vertical direction, after loosening all the fixing bolts at the four corners of the base of the injection unit main body, the injection unit main body is raised or lowered. And when adjusting in the horizontal direction, the fixing bolts are set in a temporarily tightened state, and the horizontal adjustment bolts are rotated to press the base of the injection unit main body from the left and right directions. If the centering in the vertical and horizontal directions is completed, the base of the injection unit main body is fixed to the brake by the fixing bolts. The brakes are respectively provided at the front and rear of the lower surface of the base, and slide on the sliding surfaces formed on the upper surface of the base (injection seat) of the injection device. Guide rails that sandwich and guide the brakes from both sides are provided on the sliding surfaces.

[0004] Patent Document 1: Japanese Unexamined Patent Publication No. 11-932

[0005] In Patent Document 1, the base or the guide rail of the injection device functions as a guide for the injection unit main body. There are components such as brakes between the guide and the injection unit main body. Sometimes, due to the accumulation of errors generated during the processing of the components, the positional accuracy of the nozzle decreases. Summary of the Invention

[0006] One aspect of the present invention provides a technique for improving the positional accuracy of the nozzle of an injection device.

[0007] The injection molding machine according to one aspect of the present invention includes an injection device and a guide portion. The injection device includes a nozzle that injects a molding material into a mold device. The guide portion guides the injection device in a direction in which the nozzle contacts and separates from the mold device.

[0008] Advantages of the Invention

[0009] According to one aspect of the present invention, by directly guiding the injection device by the guide portion, it is possible to suppress the accumulation of errors generated during the processing of the components. Therefore, the positional accuracy of the nozzle can be improved. Brief Description of the Drawings

[0010] Figure 1 It is a diagram showing a state at the end of mold opening of an injection molding machine according to one embodiment.

[0011] Figure 2 This is a diagram showing the state during mold clamping of an injection molding machine according to an embodiment.

[0012] Figure 3 This is a perspective view showing a guiding portion of an injection device according to an embodiment.

[0013] Figure 4 This is a partial cross-sectional view showing an injection device and a guiding portion according to an embodiment.

[0014] Figure 5 This is a top view showing an example of a horizontal position adjusting portion.

[0015] Figure 6 This is a top view showing a modified example of a horizontal position adjusting portion.

[0016] Figure 7 This is a top view showing another modified example of a horizontal position adjusting portion.

[0017] Figure 8 This is a front view showing an example of a vertical position adjusting portion.

[0018] Figure 9 This is a front view showing a modified example of a vertical position adjusting portion.

[0019] Figure 10 This is a front view showing an example of a movement restricting portion.

[0020] Figure 11 This is a front view showing a modified example of a movement restricting portion.

[0021] In the figure: 10 - injection molding machine, 310 - cylinder block, 320 - nozzle, 370 - guiding portion, 800 - mold device. Detailed Embodiment

[0022] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in each drawing, the same reference numerals may be assigned to the same structures and the description thereof may be omitted.

[0023] (Injection Molding Machine)

[0024] Figure 1 This is a diagram showing the state at the end of mold opening of an injection molding machine according to an embodiment. Figure 2This is a diagram showing the state of the injection molding machine during mold clamping according to an embodiment. In this specification, the X-axis direction, Y-axis direction, and Z-axis direction are perpendicular to each other. The X-axis direction and Y-axis direction represent the horizontal direction, and the Z-axis direction represents the vertical direction. When the mold clamping device 100 is horizontal, the X-axis direction is the mold opening and closing direction, and the Y-axis direction is the width direction of the injection molding machine 10. The negative side of the Y-axis direction is called the operation side, and the positive side of the Y-axis direction is called the opposite side of the operation side.

[0025] As Figures 1 - 2 shown, the injection molding machine 10 has: a mold clamping device 100, a mold opening and closing device 800; an ejection device 200 that ejects the molded product formed by the mold device 800; an injection device 300 that injects a molding material into the mold device 800; a moving device 400 that moves the injection device 300 relative to the mold device 800; a control device 700 that controls each component of the injection molding machine 10; and a frame 900 that supports each component of the injection molding machine 10. The frame 900 includes: a mold clamping device frame 910 that supports the mold clamping device 100; and an injection device frame 920 that supports the injection device 300. The mold clamping device frame 910 and the injection device frame 920 are respectively provided on the bottom plate 2 via a horizontal adjuster 930. The control device 700 is arranged in the internal space of the injection device frame 920. Hereinafter, each component of the injection molding machine 10 will be described.

[0026] (Mold clamping device)

[0027] In the description of the mold clamping device 100, the moving direction of the movable platen 120 during mold closing (for example, the positive X-axis direction) is set as the front, and the moving direction of the movable platen 120 during mold opening (for example, the negative X-axis direction) is set as the rear for description.

[0028] The mold clamping device 100 performs mold closing, pressure boosting, mold clamping, pressure release, and mold opening of the mold device 800. The mold device 800 includes a fixed mold 810 and a movable mold 820.

[0029] The mold clamping device 100 is, for example, horizontal, and the mold opening and closing direction is horizontal. The mold clamping device 100 has a fixed platen 110 for mounting the fixed mold 810, a movable platen 120 for mounting the movable mold 820, and a moving mechanism 102 for moving the movable platen 120 relative to the fixed platen 110 in the mold opening and closing direction.

[0030] The fixed platen 110 is fixed relative to the mold clamping device frame 910. The fixed mold 810 is mounted on the surface of the fixed platen 110 facing the movable platen 120.

[0031] The movable platen 120 is configured to be movable relative to the mold clamping device frame 910 in the mold opening and closing direction. A guide member 101 for guiding the movable platen 120 is laid on the mold clamping device frame 910. A movable mold 820 is mounted on the surface of the movable platen 120 facing the fixed platen 110.

[0032] The moving mechanism 102 advances and retracts the movable platen 120 relative to the fixed platen 110 to perform mold closing, pressure boosting, mold clamping, pressure release, and mold opening of the mold device 800. The moving mechanism 102 has a toggle seat 130 disposed at an interval from the fixed platen 110, a connecting rod 140 connecting the fixed platen 110 and the toggle seat 130, a toggle mechanism 150 that moves the movable platen 120 relative to the toggle seat 130 in the mold opening and closing direction, a mold clamping motor 160 that operates the toggle mechanism 150, a motion conversion mechanism 170 that converts the rotational motion of the mold clamping motor 160 into a linear motion, and a mold thickness adjustment mechanism 180 that adjusts the interval between the fixed platen 110 and the toggle seat 130.

[0033] The toggle seat 130 is disposed at an interval from the fixed platen 110 and is placed on the mold clamping device frame 910 so as to be movable in the mold opening and closing direction. In addition, the toggle seat 130 can be configured to be movable along the guide member laid on the mold clamping device frame 910. The guide member of the toggle seat 130 can be common with the guide member 101 of the movable platen 120.

[0034] In addition, in the present embodiment, the fixed platen 110 is fixed relative to the mold clamping device frame 910, and the toggle seat 130 is configured to be movable relative to the mold clamping device frame 910 in the mold opening and closing direction. However, it is also possible that the toggle seat 130 is fixed relative to the mold clamping device frame 910, and the fixed platen 110 is configured to be movable relative to the mold clamping device frame 910 in the mold opening and closing direction.

[0035] The connecting rod 140 connects the fixed platen 110 and the toggle seat 130 at an interval L in the mold opening and closing direction. A plurality of (for example, four) connecting rods 140 can be used. The plurality of connecting rods 140 are configured to be parallel to the mold opening and closing direction and extend according to the mold clamping force. A connecting rod strain detector 141 for detecting the strain of the connecting rod 140 can be provided on at least one connecting rod 140. The connecting rod strain detector 141 sends a signal representing its detection result to the control device 700. The detection result of the connecting rod strain detector 141 is used for the detection of the mold clamping force and the like.

[0036] In addition, in the present embodiment, the connecting rod strain detector 141 is used as the mold clamping force detector for detecting the mold clamping force. However, the present invention is not limited thereto. The mold clamping force detector is not limited to a strain gauge type, and can also be a piezoelectric type, a capacitive type, a hydraulic type, an electromagnetic type, etc., and its installation position is not limited to the connecting rod 140.

[0037] The toggle mechanism 150 is disposed between the movable platen 120 and the toggle base 130, and causes the movable platen 120 to move relative to the toggle base 130 in the die opening and closing direction. The toggle mechanism 150 has a crosshead 151 that moves in the die opening and closing direction and a pair of link groups that flex and extend by the movement of the crosshead 151. The pair of link groups each have a first link 152 and a second link 153 that are connected by pins or the like to be freely flexed and extended. The first link 152 is mounted by pins or the like to be swingable relative to the movable platen 120. The second link 153 is mounted by pins or the like to be swingable relative to the toggle base 130. The second link 153 is mounted to the crosshead 151 via a third link 154. If the crosshead 151 is advanced and retracted relative to the toggle base 130, the first link 152 and the second link 153 flex and extend, causing the movable platen 120 to advance and retract relative to the toggle base 130.

[0038] In addition, the structure of the toggle mechanism 150 is not limited to Figure 1 and Figure 2 the structure shown. For example, in Figure 1 and Figure 2 the number of nodes of each link group is 5, but it can be 4, or one end of the third link 154 can be joined to the node of the first link 152 and the second link 153.

[0039] The clamping motor 160 is mounted on the toggle base 130 and operates the toggle mechanism 150. The clamping motor 160 causes the crosshead 151 to advance and retract relative to the toggle base 130, causing the first link 152 and the second link 153 to flex and extend, causing the movable platen 120 to advance and retract relative to the toggle base 130. The clamping motor 160 is directly connected to the motion conversion mechanism 170, but it can also be connected to the motion conversion mechanism 170 via a belt, a pulley, or the like.

[0040] The motion conversion mechanism 170 converts the rotational motion of the clamping motor 160 into the linear motion of the crosshead 151. The motion conversion mechanism 170 includes a lead screw shaft and a lead screw nut that is screwed onto the lead screw shaft. A ball or a roller can be interposed between the lead screw shaft and the lead screw nut.

[0041] The clamping device 100 performs a mold closing process, a pressure boosting process, a clamping process, a pressure releasing process, a mold opening process, etc. under the control of the control device 700.

[0042] In the mold closing process, the crosshead 151 is advanced to the mold closing end position at a set moving speed by driving the clamping motor 160, causing the movable platen 120 to advance so that the moving die 820 contacts the fixed die 810. For example, a clamping motor encoder 161 or the like is used to detect the position and moving speed of the crosshead 151. The clamping motor encoder 161 detects the rotation of the clamping motor 160 and sends a signal representing the detection result to the control device 700.

[0043] In addition, the crosshead position detector for detecting the position of the crosshead 151 and the crosshead moving speed detector for detecting the moving speed of the crosshead 151 are not limited to the clamping motor encoder 161, and conventional detectors can be used. Also, the movable platen position detector for detecting the position of the movable platen 120 and the movable platen moving speed detector for detecting the moving speed of the movable platen 120 are not limited to the clamping motor encoder 161, and conventional detectors can be used.

[0044] In the boosting process, the clamping motor 160 is further driven to move the crosshead 151 forward from the mold closing end position to the mold clamping position, thereby generating a mold clamping force.

[0045] In the mold clamping process, the clamping motor 160 is driven to maintain the position of the crosshead 151 at the mold clamping position. In the mold clamping process, the mold clamping force generated in the boosting process is maintained. In the mold clamping process, a cavity space 801 is formed between the moving mold 820 and the stationary mold 810 (refer to Figure 2 ), and the injection device 300 fills the cavity space 801 with a liquid molding material. The filled molding material is cured, thereby obtaining a molded product.

[0046] The number of the cavity spaces 801 can be one or more. In the latter case, multiple molded products can be obtained simultaneously. Inserts can be arranged in a part of the cavity space 801, and the cavity space 801 is filled with a molding material in another part. A molded product in which the inserts and the molding material are integrated can be obtained.

[0047] In the pressure release process, the crosshead 151 is retracted from the mold clamping position to the mold opening start position by driving the clamping motor 160, and the movable platen 120 is retracted to reduce the mold clamping force. The mold opening start position and the mold closing end position can be the same position.

[0048] In the mold opening process, the crosshead 151 is retracted from the mold opening start position to the mold opening end position at a set moving speed by driving the clamping motor 160, and the movable platen 120 is retracted to separate the moving mold 820 from the stationary mold 810. Then, the ejector device 200 ejects the molded product from the moving mold 820.

[0049] The setting conditions in the mold closing process, pressure boosting process, and mold clamping process are uniformly set as a series of setting conditions. For example, the moving speed, position of the crosshead 151 (including the mold closing start position, moving speed switching position, mold closing end position, and mold clamping position) in the mold closing process and pressure boosting process, and the mold clamping force are uniformly set as a series of setting conditions. The mold closing start position, moving speed switching position, mold closing end position, and mold clamping position are arranged in sequence from the rear to the front, and represent the start and end points of the intervals where the moving speed is set. The moving speed is set for each interval. The moving speed switching position can be one or multiple. The moving speed switching position can be not set. Only either the mold clamping position or the mold clamping force can be set.

[0050] The setting conditions in the pressure release process and mold opening process are also set in the same way. For example, the moving speed, position of the crosshead 151 (mold opening start position, moving speed switching position, and mold opening end position) in the pressure release process and mold opening process are uniformly set as a series of setting conditions. The mold opening start position, moving speed switching position, and mold opening end position are arranged in sequence from the front to the rear, and represent the start and end points of the intervals where the moving speed is set. The moving speed is set for each interval. The moving speed switching position can be one or multiple. The moving speed switching position can be not set. The mold opening start position and the mold closing end position can be the same position. Also, the mold opening end position and the mold closing start position can be the same position.

[0051] In addition, instead of the moving speed, position, etc. of the crosshead 151, the moving speed, position, etc. of the movable platen 120 can also be set. Also, instead of the position of the crosshead (such as the mold clamping position) and the position of the movable platen, the mold clamping force can be set.

[0052] However, the toggle mechanism 150 amplifies the driving force of the mold clamping motor 160 and transmits it to the movable platen 120. Its magnification ratio is also called the toggle ratio. The toggle ratio changes according to the angle θ formed by the first link 152 and the second link 153 (hereinafter, also called "link angle θ"). The link angle θ is obtained from the position of the crosshead 151. When the link angle θ is 180°, the toggle ratio becomes the maximum.

[0053] When the thickness of the mold device 800 changes due to replacement of the mold device 800, temperature change of the mold device 800, etc., mold thickness adjustment is performed to obtain a specified mold clamping force during mold clamping. In the mold thickness adjustment, for example, the interval L between the fixed platen 110 and the toggle seat 130 is adjusted so that the link angle θ of the toggle mechanism 150 becomes a specified angle at the moment when the moving mold 820 contacts the stationary mold 810.

[0054] The mold clamping device 100 is provided with a mold thickness adjusting mechanism 180. The mold thickness adjusting mechanism 180 adjusts the interval L between the fixed platen 110 and the toggle seat 130, thereby performing mold thickness adjustment. In addition, regarding the timing of mold thickness adjustment, for example, it is performed during the period from the end of the molding cycle to the start of the next molding cycle. The mold thickness adjusting mechanism 180 has, for example: a lead screw shaft 181 formed at the rear end of the connecting rod 140; a lead screw nut 182 that is rotatably held in the toggle seat 130 and cannot move forward or backward; and a mold thickness adjusting motor 183 that rotates the lead screw nut 182 screwed with the lead screw shaft 181.

[0055] The lead screw shaft 181 and the lead screw nut 182 are provided for each connecting rod 140. The rotational driving force of the mold thickness adjusting motor 183 can be transmitted to the plurality of lead screw nuts 182 via the rotational driving force transmission part 185. The plurality of lead screw nuts 182 can be rotated synchronously. In addition, by changing the transmission path of the rotational driving force transmission part 185, the plurality of lead screw nuts 182 can also be rotated individually.

[0056] The rotational driving force transmission part 185 is constituted by, for example, gears or the like. At this time, driven gears are formed on the outer periphery of each lead screw nut 182, a driving gear is mounted on the output shaft of the mold thickness adjusting motor 183, and an intermediate gear that meshes with the plurality of driven gears and the driving gear is rotatably held at the central part of the toggle seat 130. In addition, instead of gears, the rotational driving force transmission part 185 can also be constituted by a belt, a pulley, or the like.

[0057] The operation of the mold thickness adjusting mechanism 180 is controlled by the control device 700. The control device 700 drives the mold thickness adjusting motor 183 to rotate the lead screw nut 182. As a result, the position of the toggle seat 130 relative to the connecting rod 140 is adjusted, and the interval L between the fixed platen 110 and the toggle seat 130 is adjusted. In addition, a plurality of mold thickness adjusting mechanisms can be used in combination.

[0058] The interval L is detected using the mold thickness adjusting motor encoder 184. The mold thickness adjusting motor encoder 184 detects the rotation amount and rotation direction of the mold thickness adjusting motor 183, and sends a signal indicating the detection result to the control device 700. The detection result of the mold thickness adjusting motor encoder 184 is used to monitor and control the position of the toggle seat 130 and the interval L. In addition, the toggle seat position detector for detecting the position of the toggle seat 130 and the interval detector for detecting the interval L are not limited to the mold thickness adjusting motor encoder 184, and conventional detectors can be used.

[0059] The mold clamping device 100 may be provided with a mold temperature regulator for adjusting the temperature of the mold device 800. The mold device 800 has a flow path for a temperature regulating medium inside it. The mold temperature regulator adjusts the temperature of the temperature regulating medium supplied to the flow path of the mold device 800, thereby adjusting the temperature of the mold device 800.

[0060] In addition, the mold clamping device 100 of the present embodiment is a horizontal type with the mold opening and closing direction being horizontal, but it can also be a vertical type with the mold opening and closing direction being vertical and horizontal.

[0061] In addition, the mold clamping device 100 of the present embodiment has a mold clamping motor 160 as a driving unit, but it can also have a hydraulic cylinder instead of the mold clamping motor 160. Moreover, the mold clamping device 100 has a linear motor for mold opening and closing, and it can also have an electromagnet for mold clamping.

[0062] (Ejector device)

[0063] In the description of the ejector device 200, similar to the description of the mold clamping device 100, the moving direction of the movable platen 120 at the time of mold closing (for example, the positive X-axis direction) is set as the front, and the moving direction of the movable platen 120 at the time of mold opening (for example, the negative X-axis direction) is set as the rear for the description.

[0064] The ejector device 200 is installed on the movable platen 120 and advances and retreats together with the movable platen 120. The ejector device 200 has: an ejector rod 210 that ejects the molded product from the mold device 800; and a drive mechanism 220 that moves the ejector rod 210 in the moving direction (X-axis direction) of the movable platen 120.

[0065] The ejector rod 210 is configured to be able to advance and retreat freely in the through-hole of the movable platen 120. The front end of the ejector rod 210 contacts the ejector plate 826 of the moving mold 820. The front end of the ejector rod 210 can be connected to the ejector plate 826 or can be not connected thereto.

[0066] The drive mechanism 220 has, for example, an ejector motor and a motion conversion mechanism that converts the rotational motion of the ejector motor into the linear motion of the ejector rod 210. The motion conversion mechanism includes a lead screw shaft and a lead screw nut that is screwed onto the lead screw shaft. A ball or a roller can be interposed between the lead screw shaft and the lead screw nut.

[0067] The ejector device 200 performs an ejection process under the control of the control device 700. In the ejection process, the ejector rod 210 is advanced from the standby position to the ejection position at a set moving speed, causing the ejector plate 826 to advance to eject the molded product. Then, the ejector motor is driven to cause the ejector rod 210 to retreat at a set moving speed, causing the ejector plate 826 to retreat to the original standby position.

[0068] For example, an ejector motor encoder is used to detect the position and moving speed of the ejector rod 210. The ejector motor encoder detects the rotation of the ejector motor and sends a signal representing the detection result to the control device 700. In addition, the ejector rod position detector that detects the position of the ejector rod 210 and the ejector rod moving speed detector that detects the moving speed of the ejector rod 210 are not limited to the ejector motor encoder, and conventional detectors can be used.

[0069] (Injection device)

[0070] In the description of the injection device 300, different from the description of the mold clamping device 100 and the ejection device 200, the moving direction of the screw 330 during filling (for example, the negative X-axis direction) is set as the front, and the moving direction of the screw 330 during metering (for example, the positive X-axis direction) is set as the rear for the description.

[0071] The injection device 300 is configured to be retractable relative to the injection device frame 920. The injection device 300 is configured to be retractable relative to the mold device 800. The injection device 300 contacts the mold device 800 and fills the cavity space 801 in the mold device 800 with a molding material. The injection device 300 has, for example, a cylinder 310 for heating the molding material, a nozzle 320 provided at the front end of the cylinder 310, a screw 330 configured to be retractable and rotatable within the cylinder 310, a metering motor 340 for rotating the screw 330, an injection motor 350 for moving the screw 330 forward and backward, and a load detector 360 for detecting the load transmitted between the injection motor 350 and the screw 330.

[0072] The cylinder 310 heats the molding material supplied to the inside from the supply port 311. The molding material includes, for example, resin and the like. The molding material is formed, for example, in a granular shape and is supplied to the supply port 311 in a solid state. The supply port 311 is formed at the rear of the cylinder 310. A cooler 312 such as a water-cooled cylinder is provided on the outer periphery of the rear part of the cylinder 310. A heater 313 such as a band heater and a temperature detector 314 are provided on the outer periphery of the cylinder 310 further forward than the cooler 312.

[0073] The cylinder 310 is divided into a plurality of regions along the axial direction of the cylinder 310 (for example, the X-axis direction). Heaters 313 and temperature detectors 314 are provided in the plurality of regions respectively. Set temperatures are set for the plurality of regions respectively, and the control device 700 controls the heater 313 so that the detected temperature of the temperature detector 314 becomes the set temperature.

[0074] The nozzle 320 is provided at the front end of the cylinder 310 and presses against the mold device 800. A heater 313 and a temperature detector 314 are provided on the outer periphery of the nozzle 320. The control device 700 controls the heater 313 so that the detected temperature of the nozzle 320 becomes the set temperature.

[0075] The screw 330 is configured to be rotatable and axially movable within the cylinder 310. When the screw 330 rotates, the molding material is conveyed forward along the helical grooves of the screw 330. As the molding material is conveyed forward, it is gradually melted by the heat from the cylinder 310. As the liquid molding material is conveyed to the front of the screw 330 and accumulates in the front portion of the cylinder 310, the screw 330 retracts. Then, when the screw 330 advances, the liquid molding material accumulated in front of the screw 330 is injected from the nozzle 320 and fills the mold device 800.

[0076] The check ring 331 is axially movably mounted at the front portion of the screw 330, and the check ring 331 serves as a check valve to prevent the molding material from flowing backward from the front of the screw 330 to the rear when the screw 330 is pushed forward.

[0077] When the screw 330 advances, the check ring 331 is pushed backward by the pressure of the molding material in front of the screw 330 and relatively retracts with respect to the screw 330 to a closed position where the flow path of the molding material is blocked (refer to Figure 2 ). Thus, the molding material accumulated in front of the screw 330 is prevented from flowing backward.

[0078] On the other hand, when the screw 330 rotates, the check ring 331 is pushed forward by the pressure of the molding material conveyed forward along the helical grooves of the screw 330 and relatively advances with respect to the screw 330 to an open position where the flow path of the molding material is opened (refer to Figure 1 ). Thus, the molding material is conveyed to the front of the screw 330.

[0079] The check ring 331 can be either a co-rotating type that rotates together with the screw 330 or a non-co-rotating type that does not rotate together with the screw 330.

[0080] In addition, the injection device 300 can have a drive source for moving the check ring 331 relative to the screw 330 between the open position and the closed position.

[0081] The metering motor 340 rotates the screw 330. The drive source for rotating the screw 330 is not limited to the metering motor 340, and for example, it can be a hydraulic pump or the like.

[0082] The injection motor 350 moves the screw 330 axially. A motion conversion mechanism or the like for converting the rotational motion of the injection motor 350 into the linear motion of the screw 330 is provided between the injection motor 350 and the screw 330. The motion conversion mechanism, for example, has a lead screw shaft and a lead screw nut screwed to the lead screw shaft. A ball or a roller or the like can be provided between the lead screw shaft and the lead screw nut. The drive source for moving the screw 330 axially is not limited to the injection motor 350, and for example, it can be a hydraulic cylinder or the like.

[0083] The load detector 360 detects the load transmitted between the injection motor 350 and the screw 330. The detected load is converted into pressure by the control device 700. The load detector 360 is provided on the load transmission path between the injection motor 350 and the screw 330 and detects the load acting on the load detector 360.

[0084] The load detector 360 sends the signal of the detected load to the control device 700. The load detected by the load detector 360 is converted into the pressure acting between the screw 330 and the molding material and is used to control and monitor the pressure that the screw 330 bears from the molding material, the back pressure on the screw 330, and the pressure acting on the molding material from the screw 330, etc.

[0085] In addition, the pressure detector for detecting the pressure of the molding material is not limited to the load detector 360, and a conventional detector can be used. For example, a nozzle pressure sensor or an in-mold pressure sensor can be used. The nozzle pressure sensor is provided on the nozzle 320. The in-mold pressure sensor is provided inside the mold device 800.

[0086] The injection device 300 performs metering process, filling process, holding pressure process, etc. under the control of the control device 700. The filling process and the holding pressure process can be collectively referred to as the injection process.

[0087] In the metering process, the metering motor 340 is driven to rotate the screw 330 at a set speed, and the molding material is conveyed forward along the spiral groove of the screw 330. Along with this, the molding material is gradually melted. As the liquid molding material is conveyed to the front of the screw 330 and accumulates in the front part of the cylinder 310, the screw 330 retreats. For example, the metering motor encoder 341 is used to detect the rotation speed of the screw 330. The metering motor encoder 341 detects the rotation of the metering motor 340 and sends the signal representing the detection result to the control device 700. In addition, the screw rotation speed detector for detecting the rotation speed of the screw 330 is not limited to the metering motor encoder 341, and a conventional detector can be used.

[0088] In the metering process, in order to limit the sharp retreat of the screw 330, the injection motor 350 can be driven to apply a set back pressure to the screw 330. For example, the load detector 360 is used to detect the back pressure on the screw 330. When the screw 330 retreats to the metering end position and a specified amount of molding material accumulates in front of the screw 330, the metering process ends.

[0089] The position and rotation speed of the screw 330 in the metering process are uniformly set as a series of setting conditions. For example, the metering start position, the rotation speed switching position, and the metering end position are set. These positions are arranged in sequence from the front side to the rear side, and represent the start point and end point of the interval of the set rotation speed. The rotation speed is set for each interval. The rotation speed switching position can be one or more. The rotation speed switching position can also not be set. Moreover, the back pressure is set for each interval.

[0090] In the filling process, the injection motor 350 is driven to make the screw 330 advance at a set moving speed, and the liquid molding material accumulated in front of the screw 330 is filled into the cavity space 801 in the mold device 800. For example, the injection motor encoder 351 is used to detect the position and moving speed of the screw 330. The injection motor encoder 351 detects the rotation of the injection motor 350 and sends a signal representing the detection result to the control device 700. When the position of the screw 330 reaches the set position, the switching from the filling process to the holding pressure process (so-called V / P switching) is performed. The position where the V / P switching is performed is also called the V / P switching position. The set moving speed of the screw 330 can be changed according to the position, time, etc. of the screw 330.

[0091] The position and moving speed of the screw 330 in the filling process are uniformly set as a series of setting conditions. For example, the filling start position (also called the "injection start position".), the moving speed switching position, and the V / P switching position are set. These positions are arranged in sequence from the rear side to the front side, and represent the start point and end point of the interval of the set moving speed. The moving speed is set for each interval. The moving speed switching position can be one or more. The moving speed switching position can also not be set.

[0092] The upper limit value of the pressure of the screw 330 is set for each interval of the set moving speed of the screw 330. The pressure of the screw 330 is detected by the load detector 360. When the pressure of the screw 330 is below the set pressure, the screw 330 advances at the set moving speed. On the other hand, when the pressure of the screw 330 exceeds the set pressure, for the purpose of protecting the mold, the screw 330 advances at a moving speed slower than the set moving speed so that the pressure of the screw 330 becomes below the set pressure.

[0093] In addition, in the filling process, after the position of the screw 330 reaches the V / P switching position, the screw 330 can be paused at the V / P switching position and then the V / P switching is performed. Just before the V / P switching, instead of the stop of the screw 330, the screw 330 can also perform a micro-speed forward or micro-speed backward. Moreover, the screw position detector for detecting the position of the screw 330 and the screw moving speed detector for detecting the moving speed of the screw 330 are not limited to the injection motor encoder 351, and conventional detectors can be used.

[0094] In the holding pressure process, the driving injection motor 350 pushes the screw 330 forward, maintains the pressure of the molding material at the front end of the screw 330 (hereinafter, also referred to as "holding pressure") at a set pressure, and pushes the remaining molding material in the cylinder block 310 toward the mold device 800. It is possible to supplement the insufficient amount of molding material in the mold device 800 due to cooling shrinkage. For example, a load detector 360 is used to detect the holding pressure. The set value of the holding pressure can be changed according to the elapsed time since the start of the holding pressure process and the like. The holding pressure and the holding time for maintaining the holding pressure in multiple holding pressure processes can be set separately, or can be uniformly set as a series of setting conditions.

[0095] In the holding pressure process, the molding material in the cavity space 801 in the mold device 800 is gradually cooled, and at the end of the holding pressure process, the inlet of the cavity space 801 is blocked by the solidified molding material. This state is called gate sealing, which can prevent the reverse flow of the molding material from the cavity space 801. After the holding pressure process, the cooling process starts. In the cooling process, the molding material in the cavity space 801 is solidified. For the purpose of shortening the molding cycle time, the metering process can be performed in the cooling process.

[0096] In addition, the injection device 300 of the present embodiment is a coaxial screw type, but it can also be a screw pre-plasticizing type or the like. The injection device of the screw pre-plasticizing type supplies the molding material melted in the plasticizing cylinder to the injection cylinder and injects the molding material from the injection cylinder into the mold device. In the plasticizing cylinder, the screw is configured to be rotatable and non-retractable, or the screw is configured to be rotatable and retractable. On the other hand, in the injection cylinder, the plunger is configured to be retractable.

[0097] Moreover, the injection device 300 of the present embodiment is a horizontal type with the axial direction of the cylinder block 310 being the horizontal direction, but it can also be a vertical type with the axial direction of the cylinder block 310 being the up and down direction. The mold clamping device combined with the vertical injection device 300 can be vertical or horizontal. Similarly, the mold clamping device combined with the horizontal injection device 300 can be horizontal or vertical.

[0098] (Moving device)

[0099] In the description of the moving device 400, similar to the description of the injection device 300, the moving direction of the screw 330 during filling (for example, the negative X-axis direction) is set as the front, and the moving direction of the screw 330 during metering (for example, the positive X-axis direction) is set as the rear for the description.

[0100] The mobile device 400 moves the injection device 300 forward and backward relative to the mold device 800. Moreover, the mobile device 400 presses the nozzle 320 against the mold device 800 to generate a nozzle contact pressure. The mobile device 400 includes a hydraulic pump 410, a motor 420 as a driving source, and a hydraulic cylinder 430 as a hydraulic actuator, etc.

[0101] The hydraulic pump 410 has a first port 411 and a second port 412. The hydraulic pump 410 is a bidirectional rotary pump that sucks a working fluid (such as oil) from either the first port 411 or the second port 412 and discharges it from the other port by switching the rotation direction of the motor 420 to generate hydraulic pressure. Additionally, the hydraulic pump 410 can also suck the working fluid from a tank and discharge the working fluid from either the first port 411 or the second port 412.

[0102] The motor 420 operates the hydraulic pump 410. The motor 420 drives the hydraulic pump 410 with a rotation direction and a rotational torque corresponding to a control signal from the control device 700. The motor 420 can be an electric motor or an electric servo motor.

[0103] The hydraulic cylinder 430 has a cylinder body 431, a piston 432, and a piston rod 433. The cylinder body 431 is fixed relative to the injection device 300. The piston 432 divides the interior of the cylinder body 431 into a front chamber 435 as a first chamber and a rear chamber 436 as a second chamber. The piston rod 433 is fixed relative to the fixed platen 110.

[0104] The front chamber 435 of the hydraulic cylinder 430 is connected to the first port 411 of the hydraulic pump 410 via a first flow path 401. The working fluid discharged from the first port 411 is supplied to the front chamber 435 via the first flow path 401, whereby the injection device 300 is pushed forward. The injection device 300 advances and the nozzle 320 is pressed against the fixed mold 810. The front chamber 435 functions as a pressure chamber that generates the nozzle contact pressure of the nozzle 320 by the pressure of the working fluid supplied from the hydraulic pump 410.

[0105] On the other hand, the rear chamber 436 of the hydraulic cylinder 430 is connected to the second port 412 of the hydraulic pump 410 via a second flow path 402. The working fluid discharged from the second port 412 is supplied to the rear chamber 436 of the hydraulic cylinder 430 via the second flow path 402, whereby the injection device 300 is pushed backward. The injection device 300 retreats and the nozzle 320 separates from the fixed mold 810.

[0106] Moreover, in the present embodiment, the mobile device 400 includes a hydraulic cylinder 430, but the present invention is not limited thereto. For example, instead of the hydraulic cylinder 430, an electric motor and a motion conversion mechanism that converts the rotational motion of the electric motor into a linear motion of the injection device 300 can also be used.

[0107] (Control device)

[0108] The control device 700 is constituted by a computer, for example, as Figures 1 - 2 shown, it has a CPU (Central Processing Unit), a storage medium 702 such as a memory, an input interface 703, and an output interface 704. The control device 700 performs various controls by causing the CPU 701 to execute a program stored in the storage medium 702. Further, the control device 700 receives signals from the outside through the input interface 703 and sends signals to the outside through the output interface 704.

[0109] The control device 700 repeatedly manufactures molded products by repeatedly performing a metering process, a mold closing process, a pressure boosting process, a mold clamping process, a filling process, a pressure holding process, a cooling process, a pressure releasing process, a mold opening process, and an ejection process. A series of actions for obtaining a molded product, for example, the actions from the metering process to before the start of the next metering process are also referred to as "injection" or "molding cycle". Further, the time required for one injection is also referred to as "molding cycle time" or "cycle time".

[0110] One molding cycle has, for example, a metering process, a mold closing process, a pressure boosting process, a mold clamping process, a filling process, a pressure holding process, a cooling process, a pressure releasing process, a mold opening process, and an ejection process in sequence. The order here is the order in which each process starts. The filling process, the pressure holding process, and the cooling process are performed during the mold clamping process. It is also possible to make the start of the mold clamping process coincide with the start of the filling process. The end of the pressure releasing process coincides with the start of the mold opening process.

[0111] In addition, for the purpose of shortening the molding cycle time, multiple processes can be performed simultaneously. For example, the metering process can be performed during the cooling process of the previous molding cycle or during the mold clamping process. At this time, it can be set that the mold closing process is performed at the beginning of the molding cycle. Further, the filling process can start during the mold closing process. And the ejection process can start during the mold opening process. When an on-off valve for setting the flow path of the on-off nozzle 320 is provided, the mold opening process can start during the metering process. Because even if the mold opening process starts during the metering process, as long as the on-off valve closes the flow path of the nozzle 320, the molding material does not leak from the nozzle 320.

[0112] In addition, one molding cycle can have processes other than the metering process, the mold closing process, the pressure boosting process, the mold clamping process, the filling process, the pressure holding process, the cooling process, the pressure releasing process, the mold opening process, and the ejection process.

[0113] For example, a pre-metering backflow process of retracting the screw 330 to a preset metering start position can be performed after the pressure holding process ends and before the metering process starts. It is possible to reduce the pressure of the molding material accumulated in front of the screw 330 before the metering process starts, and it is possible to prevent the screw 330 from rapidly retracting when the metering process starts.

[0114] Also, a post-metering backflow process of retracting the screw 330 to a preset filling start position (also referred to as "injection start position") can be performed after the metering process ends and before the filling process starts. It is possible to reduce the pressure of the molding material accumulated in front of the screw 330 before the filling process starts, and it is possible to prevent the leakage of the molding material from the nozzle 320 before the filling process starts.

[0115] The control device 700 is connected to the operation device 750 that receives the input operations of the user and the display device 760 of the display screen. The operation device 750 and the display device 760 are constituted by a touch panel 770, for example, and can be integrated. The touch panel 770 as the display device 760 displays a screen under the control of the control device 700. Information such as the settings of the injection molding machine 10 and the current state of the injection molding machine 10 can be displayed on the screen of the touch panel 770, for example. Also, operation parts such as buttons and input fields for receiving the input operations of the user can be displayed on the screen of the touch panel 770, for example. The touch panel 770 as the operation device 750 detects the input operations of the user on the screen and outputs a signal corresponding to the input operations to the control device 700. Thus, for example, the user can operate the operation parts provided on the screen while confirming the information displayed on the screen, and perform the settings (including input of set values) of the injection molding machine 10, etc. Also, when the user operates the operation parts provided on the screen, the user can perform the actions of the injection molding machine 10 corresponding to the operation parts. In addition, the actions of the injection molding machine 10 can be, for example, the actions (including stopping) of the mold clamping device 100, the ejector device 200, the injection device 300, the moving device 400, etc. Also, the actions of the injection molding machine 10 can be the switching of the screen displayed on the touch panel 770 as the display device 760, etc.

[0116] In addition, the case where the operation device 750 and the display device 760 of the present embodiment are integrated into the touch panel 770 has been described, but they can also be provided independently. Also, a plurality of operation devices 750 can be provided. The operation device 750 and the display device 760 are arranged on the operation side (negative Y direction) of the mold clamping device 100 (more specifically, the fixed platen 110).

[0117] (The guiding part for guiding the injection device)

[0118] Figure 3It is a perspective view showing a guiding portion 370 that guides an injection device 300 according to an embodiment. Figure 4 It is a partial cross-sectional view showing the injection device 300 and the guiding portion 370 according to an embodiment. In the description of the injection device 300 and the guiding portion 370, the direction in which the nozzle 320 approaches the mold device 800 (for example, the negative X-axis direction) is defined as the front, and the direction in which the nozzle 320 separates from the mold device 800 (for example, the positive X-axis direction) is defined as the rear for explanation.

[0119] As Figure 4 shown, the injection device 300 includes a cylinder 310 that heats a molding material and a nozzle 320 provided at the front end of the cylinder 310. The nozzle 320 presses against the mold device 800 and injects the molding material into the mold device 800. The injection device 300 can move in the direction in which the nozzle 320 contacts and separates from the mold device 800 (for example, the X-axis direction).

[0120] The injection device 300 includes an injection frame 301 for mounting the cylinder 310. The injection frame 301 has, for example, a first flange 302 for mounting the rear end of the cylinder 310. The first flange 302 includes a first mounting portion 302a for mounting the rear end of the cylinder 310.

[0121] The injection frame 301 has a second flange 303 provided behind the first flange 302. The second flange 303 includes, for example, a second mounting portion 303a for mounting the injection motor 350. The driving force of the injection motor 350 is transmitted to the screw 330 through a drive shaft (not shown). The drive shaft includes a ball screw or the like. The drive shaft passes through a second through-hole 303b that penetrates the second mounting portion 303a in the front-rear direction (refer to Figure 3 ) and a first through-hole 302b that penetrates the first mounting portion 302a in the front-rear direction, and is connected to the screw 330.

[0122] The guiding portion 370 guides the injection device 300 in the direction in which the nozzle 320 contacts and separates from the mold device 800. The guiding portion 370 contacts the injection device 300. By directly guiding the injection device 300 through the guiding portion 370, the accumulation of errors generated during machining of components can be suppressed. Therefore, the positional accuracy of the nozzle 320 can be improved. Specifically, for example, the height accuracy can be improved. And, by directly guiding the injection device 300 through the guiding portion 370, the number of components can be reduced, and thus weight reduction can be achieved. And, by reducing the number of components, cost reduction can be achieved.

[0123] As Figure 3As shown, the guiding portion 370 contacts, for example, the first flange 302 of the injection frame 301 and guides the first flange 302. The first flange 302 includes a first sliding portion 302c that slides along the guiding portion 370. A first guiding hole 302d for inserting a guide rod 373 described later is formed in the first sliding portion 302c.

[0124] A plurality of first sliding portions 302c are provided corresponding to the plurality of guide rods 373. The plurality of first sliding portions 302c are, for example, arranged at intervals in the Y-axis direction on the lower surface of the first mounting portion 302a. A notch is formed between the plurality of first sliding portions 302c, so that the injection frame 301 can be lightened.

[0125] Further, the guiding portion 370 contacts, for example, the second flange 303 of the injection frame 301 and guides the second flange 303. The second flange 303 includes a second sliding portion 303c that slides along the guiding portion 370. A second guiding hole 303d for inserting the guide rod 373 described later is formed in the second sliding portion 303c.

[0126] A plurality of second sliding portions 303c are provided corresponding to the plurality of guide rods 373. The plurality of second sliding portions 303c are, for example, arranged at intervals in the Y-axis direction on the lower surface of the second mounting portion 303a. A notch is formed between the plurality of second sliding portions 303c, so that the injection frame 301 can be lightened.

[0127] The guiding portion 370 has, for example, a first guiding block 371, a second guiding block 372 arranged at an interval from the first guiding block 371, and a guide rod 373 connecting the first guiding block 371 and the second guiding block 372.

[0128] The first guiding block 371 is fixed to the injection device frame 920 by bolts 374 or the like. Similarly, the second guiding block 372 is fixed to the injection device frame 920 by bolts 375 or the like.

[0129] The first guiding block 371 and the second guiding block 372 support, for example, the guide rod 373. The guide rod 373 is, for example, installed between the first guiding block 371 and the second guiding block 372 and a gap is formed between the guide rod 373 and the upper surface of the injection device frame 920.

[0130] The length direction of the guide rod 373 is the X-axis direction. The front end of the guide rod 373 is fixed to the first guiding block 371 by bolts 376 or the like. On the other hand, the rear end of the guide rod 373 is fixed to the second guiding block 372 by bolts 377 or the like.

[0131] The guide rod 373 includes, for example, a round bar 373a extending in the X-axis direction. The round bar 373a is inserted through the first guide hole 302d and the second guide hole 303d of the injection frame 301. By guiding the injection frame 301 with the round bar 373a, the load can be evenly dispersed along the circumferential direction of the round bar 373a.

[0132] As Figure 4 shown, the guide rod 373 may include a semi-cylindrical notch 373b at the front end of the round bar 373a. The notch 373b has a rectangular horizontal plane 373c and a semi-circular vertical plane 373d. The round bar 373a can be stably fixed to the first guide block 371 through the horizontal plane 373c.

[0133] The first guide block 371 is, for example, a rectangular parallelepiped extending in the Y-axis direction. The first guide block 371 may include rectangular parallelepiped-shaped notches 371a at both ends in the Y-axis direction. The notches 371a have a rectangular horizontal plane 371b and a rectangular vertical plane 371c. The front end of the guide rod 373 is fixed above the horizontal plane 371b of the notch 371a.

[0134] Furthermore, the guide rod 373 may include a semi-cylindrical notch 373e at the rear end of the round bar 373a. The notch 373e has a rectangular horizontal plane 373f and a semi-circular vertical plane 373g. The round bar 373a can be stably fixed to the second guide block 372 through the horizontal plane 373f.

[0135] The second guide block 372 is, for example, a rectangular parallelepiped extending in the Y-axis direction. The second guide block 372 may include rectangular parallelepiped-shaped notches 372a at both ends in the Y-axis direction. The notches 372a have a rectangular horizontal plane 372b and a rectangular vertical plane 372c. The rear end of the guide rod 373 is fixed above the horizontal plane 372b of the notch 372a.

[0136] In addition, the guide rod 373 is installed between the first guide block 371 and the second guide block 372 and is supported so as to be separated from the injection device frame 920, but it may also be in contact with the injection device frame 920. That is, the guide rod 373 may be a linear guide rail or may be slidably placed on the injection device frame 920.

[0137] When the guide rod 373 is slidably placed on the injection device frame 920, the first guide block 371 and the second guide block 372 may also be used. This is because the first guide block 371 and the second guide block 372 are longer in the Y-axis direction than the guide rod 373 and have less deformation when pressed in the Y-axis direction by a position adjusting portion described later.

[0138] Next, referring to Figure 3 and Figure 5A position adjusting unit that adjusts the position of the guiding unit 370 will be described. The position adjusting unit adjusts the position of the guiding unit 370 in a direction (for example, the Y-axis direction or the Z-axis direction) perpendicular to the guiding direction (for example, the X-axis direction) of the guiding unit 370. Figure 5 It is a top view showing an example of a horizontal position adjusting unit.

[0139] Figure 5 The shown position adjusting unit is a horizontal position adjusting unit 380 that adjusts the Y-axis direction position of the guiding unit 370. The horizontal position adjusting unit 380 adjusts the Y-axis direction position of the nozzle 320 by adjusting the Y-axis direction position of the guiding unit 370. It is possible to align the discharge port of the nozzle 320 with the injection port of the injection molding material of the mold device 800 in the Y-axis direction.

[0140] The horizontal position adjusting unit 380 can move the guiding unit 370 together with the injection device 300 in the Y-axis direction. Therefore, it is possible to maintain the guiding direction of the guiding unit 370 (the direction in which the nozzle 320 comes into contact and separates) and the axial direction of the nozzle 320 in the same direction. Therefore, the nozzle 320 can be pressed straight against the mold device 800 along the axial direction of the nozzle 320, thereby reducing the load applied to the nozzle 320.

[0141] The horizontal position adjusting unit 380 includes, for example, a fixed block 381 fixed to the injection device frame 920 and a bolt 382 that adjusts the distance between the fixed block 381 and the guiding unit 370. By adjusting the distance between the fixed block 381 and the guiding unit 370 with the bolt 382, the Y-axis direction position of the nozzle 320 can be adjusted.

[0142] The bolt 382 is, for example, a fastening bolt and is screwed into a threaded hole of the fixed block 381, protrudes from the fixed block 381, and presses the guiding unit 370 with its front end. Two sets of the fixed block 381 and the bolt 382 can be provided with the guiding unit 370 interposed therebetween. It is possible to press the guiding unit 370 in two directions in the Y-axis direction.

[0143] The bolt 382 abuts, for example, against the Y-axis direction end face of the first guiding block 371, but it can also abut against the Y-axis direction end face of the second guiding block 372. Both the first guiding block 371 and the second guiding block 372 are longer in the Y-axis direction than the guide rod 373 and have a smaller deformation when pressed in the Y-axis direction.

[0144] When adjusting the Y-axis direction position of the nozzle 320, for example, first, the bolts 374 and 375 are loosened and the fixing of the guiding unit 370 to the injection device frame 920 is released. After the fixing is released, the bolts 374 and 375 can be slowly screwed into the threaded holes of the injection device frame 920. Due to the clearance (side clearance) between the bolts 374 and 375 and the threaded holes, the guiding unit 370 can move.

[0145] Next, rotate the bolt 382 of the horizontal position adjustment unit 380 to press the guide unit 370 in the Y-axis direction. The guide unit 370 can be moved in the Y-axis direction, and thus the nozzle 320 can be moved in the Y-axis direction. Its movement range is determined, for example, by the clearance between the bolts 374 and 375 and the screw holes.

[0146] Finally, tighten the bolts 374 and 375 to fix the guide unit 370 relative to the injection device frame 920.

[0147] In addition, instead of the bolt 382, the horizontal position adjustment unit 380 may include a cylinder block. The cylinder block is, for example, a pneumatic cylinder or a hydraulic cylinder. If the guide unit 370 is pressed in the Y-axis direction by the cylinder block, the guide unit 370 can be moved in the Y-axis direction, and thus the nozzle 320 can be moved in the Y-axis direction.

[0148] Next, refer to Figure 6 to describe a modified example of the horizontal position adjustment unit 380. As Figure 6 shown, the horizontal position adjustment unit 380 may include a rotary pin 383 provided on the injection device frame 920. The guide unit 370 rotates around the rotary pin 383. Thereby, the nozzle 320 can be moved in the Y-axis direction.

[0149] As Figure 6 shown, the rotary pin 383 is, for example, provided at the center in the Y-axis direction of the second guide block 372. By tightening the bolt 382 to press the first guide block 371 in the Y-axis direction, the guide unit 370 rotates around the rotary pin 383. At this time, the bolt 375 for fixing the second guide block 372 to the injection device frame 920 is not required.

[0150] In addition, the rotary pin 383 may be provided at the center in the Y-axis direction of the first guide block 371. At this time, by tightening the bolt 382 to press the second guide block 372 in the Y-axis direction, the guide unit 370 rotates around the rotary pin 383. At this time, the bolt 374 for fixing the first guide block 371 to the injection device frame 920 is not required.

[0151] Next, refer to Figure 7 to describe another modified example of the horizontal position adjustment unit 380. As Figure 7 shown, the horizontal position adjustment unit 380 may include a fastening bolt 382 and a traction bolt 384. The traction bolt 384 is inserted through the through hole of the fixed block 381 and screwed into the screw hole of the first guide block 371 to shorten the interval between the fixed block 381 and the first guide block 371.

[0152] As Figure 7 shown, the fastening bolt 382 and the traction bolt 384 can be held by a common fixed block 381. The number of fixed blocks 381 can be reduced. InFigure 7 In this case, the fastening bolt 382 and the traction bolt 384 push and pull the first guide block 371, but they can also push and pull the second guide block 372.

[0153] In addition, the fixing block 381 and a reference block (not shown) can also be arranged with the guide portion 370 therebetween in the Y-axis direction. The reference block abuts against the end surface in the Y-axis direction of the first guide block 371 or the second guide block 372, and determines the reference position of the guide portion 370.

[0154] Moreover, the traction bolt 384 can be arranged on both sides in the Y-axis direction of the guide portion 370. At this time, the fixing blocks 381 are arranged on both sides in the Y-axis direction of the guide portion 370. Further, the traction bolt 384 can be used in combination with Figure 6 the rotary pin 383 as shown.

[0155] Next, Figure 8 is a front view showing an example of a vertical position adjusting portion. The vertical position adjusting portion 385 adjusts the Z-axis direction position of the nozzle 320 by adjusting the Z-axis direction position of the guide portion 370. The discharge port of the nozzle 320 can be aligned with the injection port of the injection molding material of the mold device 800 in the Z-axis direction.

[0156] The vertical position adjusting portion 385 moves the guide portion 370 and the injection device 300 as a set in the Y-axis direction. Therefore, the guiding direction of the guide portion 370 (the direction in which the nozzle 320 contacts and separates) and the axial direction of the nozzle 320 can be maintained in the same direction. Accordingly, the nozzle 320 can be pressed straight against the mold device 800 along the axial direction of the nozzle 320, and thus the load applied to the nozzle 320 can be reduced.

[0157] The vertical position adjusting portion 385 includes, for example, a bolt 386 that adjusts the distance between the injection device frame 920 and the guide portion 370. By adjusting the distance between the injection device frame 920 and the guide portion 370 with the bolt 386, the Z-axis direction position of the nozzle 320 can be adjusted.

[0158] The bolt 386 is, for example, a fastening bolt, and is screwed into a screw hole of the first guide block 371, protrudes from the lower surface of the first guide block 371, and presses the upper surface of the injection device frame 920 with its front end. A plurality of bolts 386 can be arranged at intervals in the Y-axis direction along the first guide block 371.

[0159] The bolt 386 can be screwed into a screw hole of the second guide block 372, can also protrude from the lower surface of the second guide block 372, and presses the upper surface of the injection device frame 920 with its front end. A plurality of bolts 386 can be arranged at intervals in the Y-axis direction along the second guide block 372.

[0160] When adjusting the Z-axis direction position of the adjustment nozzle 320, for example, first, loosen bolts 374 and 375 and release the fixation of the guide portion 370 relative to the injection device frame 920. After releasing the fixation, bolts 374 and 375 can be slowly screwed into the screw holes of the injection device frame 920. As long as the clearance between the heads of bolts 374 and 375 and the upper surface of the injection device frame 920 is greater than the thickness of the guide portion 370, the guide portion 370 can move up and down.

[0161] Next, rotate the bolt 386 of the vertical direction position adjustment portion 385, and while pressing the upper surface of the injection device frame 920 with the lower end of the bolt 386, lift the guide portion 370 through the bolt 386. In addition, the guide portion 370 can also be lowered. When lowering the guide portion 370, it is not necessary to first loosen bolts 374 and 375. The movable range of the guide portion 370 in the Z-axis direction is determined by, for example, the lengths of bolts 374 and 375.

[0162] Finally, tighten bolts 374 and 375 to fix the guide portion 370 relative to the injection device frame 920.

[0163] In addition, instead of the bolt 386, the vertical direction position adjustment portion 385 may include a cylinder body. The cylinder body is, for example, a pneumatic cylinder or a hydraulic cylinder. As long as the guide portion 370 is pressed in the Z-axis direction through the cylinder body, the guide portion 370 can be moved in the Z-axis direction, and further, the nozzle 320 can be moved in the Y-axis direction.

[0164] Next, refer to Figure 9 and describe a modified example of the vertical direction position adjustment portion 385. As Figure 9 shown, the vertical direction position adjustment portion 385 may include a gasket 387 sandwiched between the guide portion 370 and the injection device frame 920. By adjusting the thickness or the number of sheets of the gasket 387, the Z-axis direction position of the guide portion 370 can be adjusted, and the Z-axis direction position of the nozzle 320 can also be adjusted.

[0165] The gasket 387 and Figure 8 the bolt 386 shown can be used in combination. For example, a clearance can be formed between the guide portion 370 and the injection device frame 920 through the bolt 386, and the gasket 387 can be inserted into the formed clearance.

[0166] Next, refer to Figure 10The movement restricting portion 390 will be described. The injection molding machine 10 may include a movement restricting portion 390 that restricts the movement of the injection device 300 in the guiding direction (e.g., the X-axis direction) of the restricting guiding portion 370. For example, during the transportation of the injection molding machine 10, the injection device 300 can be fixed by the movement restricting portion 390. After the transportation of the injection molding machine 10 is completed, the movement restricting portion 390 is disassembled, and the movement restriction of the injection device 300 is released.

[0167] The movement restricting portion 390 may, for example, have a connecting member 391 that connects the second guiding block 372 and the injection device 300 so that the distance in the X-axis direction can be changed. By making the distance in the X-axis direction between the second guiding block 372 and the injection device 300 variable, even if the length of the cylinder block 310 changes due to a change in the screw 330 or the like, the injection device 300 can be fixed at an appropriate position.

[0168] The connecting member 391 connects, for example, the second guiding block 372 and the second flange 303 of the injection device 300 so that the distance in the X-axis direction can be changed. The connecting member 391 has, for example, a threaded rod 392 extending in the X-axis direction, a connecting block 393 provided at one end in the length direction of the threaded rod 392, and a nut 394 provided at the other end in the length direction of the threaded rod 392. The threaded rod 392 is inserted through a through hole 372d (refer to Figure 3 ) that penetrates the second guiding block 372 in the front-rear direction. The nut 394 is screwed onto the rear end of the threaded rod 392.

[0169] The connecting block 393 is fixed to the second flange 303 by bolts or the like. The connecting block 393 and the second flange 303 may be integrated. On the other hand, the nut 394 is clamped and fixed by the second guiding block 372 and a nut pressing plate 395. The nut pressing plate 395 is fixed to the second guiding block 372 by bolts 396 or the like. The bolts 396 are, for example, symmetrically arranged with respect to the threaded rod 392 and are screwed into screw holes 372e of the second guiding block 372 (refer to Figure 3 ).

[0170] When restricting the movement of the injection device 300 in the X-axis direction by the movement restricting portion 390, for example, first, the connecting block 393 is fixed to the second flange 303. Then, the nut 394 is installed at the rear end of the threaded rod 392 extending rearward from the connecting block 393. Then, the nut 394 is rotated so that the nut 394 abuts against the second guiding block 372. Then, the nut 394 is clamped and fixed by the second guiding block 372 and the nut pressing plate 395. Thus, the movement of the injection device 300 in both directions in the X-axis direction can be restricted. In addition, the release of the movement restriction of the injection device 300 is performed in the reverse order, so the description is omitted.

[0171] Although not shown, the connecting member 391 can connect the first guide block 371 and the first flange 302 of the injection device 300 so that the distance in the X-axis direction can be changed. At this time, the threaded rod 392 is inserted through a through hole (not shown) that penetrates the first guide block 371 in the front-rear direction. At this time, the nut 394 is screwed onto the front end of the threaded rod 392. The connecting block 393 is fixed to the first flange 302 by bolts or the like. On the other hand, the nut 394 is clamped and fixed by the first guide block 371 and the nut pressing plate 395. The nut pressing plate 395 is fixed to the first guide block 371 by bolts 396 or the like. The bolts 396 are symmetrically arranged with respect to the threaded rod 392, for example, and are screwed into a screw hole (not shown) of the first guide block 371.

[0172] Next, refer to Figure 11 to describe a modified example of the movement restricting portion 390. As Figure 11 shown, the movement restricting portion 390 may have a connecting member 397 that connects the injection device 300 and the injection device frame 920. The connecting member 397 includes, for example, a connecting plate 398 and bolts 399A and 399B.

[0173] The connecting plate 398 has an L shape and includes a horizontal plate 398a and a vertical plate 398b. The horizontal plate 398a abuts against the upper surface of the injection device frame 920, for example. On the other hand, the vertical plate 398b abuts against the front surface of the first flange 302 of the injection frame 301, for example. In addition, the vertical plate 398b may abut against the rear surface of the first flange 302 or the front surface or the rear surface of the second flange 303.

[0174] The bolt 399A is inserted through a through hole that penetrates the vertical plate 398b in the horizontal direction and is screwed into a screw hole of the first flange 302. On the other hand, the bolt 399B is inserted into a through hole that penetrates the horizontal plate 398a in the vertical direction and is screwed into a screw hole 921 formed on the upper surface of the injection device frame 920. Thereby, the movement of the injection device 300 can be restricted. When releasing the movement restriction, the connecting member 397 can be disassembled.

[0175] A plurality of screw holes 921 can be formed at intervals in the X-axis direction on the upper surface of the injection device frame 920. By changing the position of the screw hole 921 into which the bolt 399B is screwed, the fixed position of the injection device 300 can be changed.

[0176] When using Figure 10 the connecting member 391 shown and when using Figure 11 the connecting member 397 shown, there is no need to process the injection device frame 920. On the other hand, when using Figure 11 the connecting member 397 shown, the connecting structure can be simplified.

[0177] The above describes the embodiments of the injection molding machine according to the present invention, but the present invention is not limited to the above embodiments and the like. Within the scope described in the technical solution, various changes, corrections, substitutions, additions, deletions, and combinations can be made. Of course, these also fall within the technical scope of the present invention.

Claims

1. An injection molding machine, comprising: An injection device including a nozzle for injecting a molding material into a mold device; A guiding portion for guiding the injection device in a direction in which the nozzle contacts and separates from the mold device; and A position adjusting portion for adjusting the position of the guiding portion in a direction perpendicular to the guiding direction of the guiding portion, The guiding portion has a first guiding block, a second guiding block spaced apart from the first guiding block, and a guide rod connecting the first guiding block and the second guiding block, The guide rod guides the injection device, The position adjusting portion Comprises: A horizontal position adjusting portion for adjusting the horizontal position of one guiding block in a direction perpendicular to the guiding direction; and a rotary pin provided at the center of the other guiding block, The guiding portion rotates about the rotary pin.

2. The injection molding machine according to claim 1, Wherein, The injection device has a cylinder for heating the molding material, the nozzle provided at one end of the cylinder, and a flange mounted at the other end of the cylinder, The flange includes a sliding portion that moves along the guiding portion.

3. The injection molding machine according to claim 1, Wherein, The position adjusting portion includes a fixing block fixed to a frame supporting the injection device and a bolt or a cylinder for adjusting the distance between the fixing block and the guiding portion.

4. The injection molding machine according to claim 1, Wherein, The position adjusting portion includes a bolt or a cylinder for adjusting the distance between a frame supporting the injection device and the guiding portion.

5. The injection molding machine according to claim 1, comprising: A movement restricting portion for restricting the movement of the injection device in the guiding direction of the guiding portion.

6. The injection molding machine according to claim 5, Wherein, The movement restricting portion has a connecting member that connects the first guiding block or the second guiding block to the injection device and can change the distance in the guiding direction of the guiding portion.

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