Movable pressure plate

Abstract

The present invention provides a movable platen capable of improving workability. The movable platen includes: a platen main body; and a pair of legs connected to the platen main body and having sliders connected to the lower surface thereof. One of the legs has a positioning portion on the lower surface, and the positioning portion protrudes downward for positioning the turning direction of the slider. The other leg has a protruding portion on the lower surface, and the protruding portion protrudes to the same position as the lower surface of the positioning portion.

Description

Technical Field

[0001] The present invention relates to a movable platen of a mold clamping device. Background Art

[0002] An injection molding machine equipped with a mold clamping device for moving a movable platen is known.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2001-121593

[0006] However, improvement in workability is required during the assembly or maintenance of the mold clamping device. Summary of the Invention

[0007] Therefore, an object of the present invention is to provide a movable platen that improves workability.

[0008] The movable platen according to one aspect of the embodiment includes: a platen main body; and a pair of legs connected to the platen main body, and a slider is connected to the lower surface. One of the legs has a positioning portion on the lower surface, and the positioning portion protrudes downward for positioning the turning direction of the slider. The other leg has a protruding portion on the lower surface, and the protruding portion protrudes to the same position as the lower surface of the positioning portion.

[0009] Advantages of the Invention

[0010] According to the present invention, a movable platen that improves workability can be provided. Brief Description of the Drawings

[0011] Figure 1 It is a view showing a state at the end of mold opening of an injection molding machine according to one embodiment.

[0012] Figure 2 It is a view showing a state during mold clamping of an injection molding machine according to one embodiment.

[0013] Figure 3 It is a front view of the movable platen.

[0014] Figure 4 It is a side view of the movable platen.

[0015] Figure 5 It is an enlarged view of one leg of the movable platen.

[0016] Figure 6 It is an enlarged view of the other leg of the movable platen.

[0017] Description of Reference Numerals

[0018] 1 Injection molding machine

[0019] 11 Positioning part

[0020] 12 Bolt support part

[0021] 13 Bolt

[0022] 14 Bolt

[0023] 21 Protrusion

[0024] 100 Mold clamping device

[0025] 101 Guide part

[0026] 105 Sliding part

[0027] 106 Bolt

[0028] 120 Movable platen

[0029] 121 Mold mounting part

[0030] 121a Notch

[0031] 122 Support part

[0032] 123 Toggle pin connection part

[0033] 124A, 124B Legs

[0034] 124A1, 124B1 Feet

[0035] 124A2, 124B2 First leg

[0036] 124A3, 124B3 Second leg

[0037] 124A4 Stop bolt mounting part

[0038] 140 Connecting rod

[0039] S1 Lower surface (lower surface of one leg)

[0040] S2 Side surface

[0041] S3 Side surface

[0042] S4 Lower surface (lower surface of the other leg)

[0043] S5 Side surface

[0044] S6 Side surface

[0045] S11 Lower surface (lower surface of the positioning part)

[0046] S12 Lower surface (side surface of the bolt support part)

[0047] Lower surface of S21 (lower surface of the protrusion) Detailed implementation mode

[0048] Hereinafter, the mode for implementing the present invention will be described with reference to the accompanying drawings. In each drawing, the same or corresponding structures are denoted by the same or corresponding reference numerals and description thereof is omitted.

[0049] <Injection molding machine 1>

[0050] First, use Figure 1 and Figure 2 to describe the injection molding machine 1. Figure 1 is a diagram showing the state of the injection molding machine at the end of mold opening in one embodiment. Figure 2 is a diagram showing the state of the injection molding machine during mold clamping in one embodiment. In this specification, the X-axis direction, the Y-axis direction, and the Z-axis direction are mutually perpendicular directions. The X-axis direction and the 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 1. 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.

[0051] As Figures 1 - 2 shown, the injection molding machine 1 has: a mold clamping device 100 for opening and closing the mold device 800; an ejection device 200 for ejecting the molded product molded in the mold device 800; an injection device 300 for injecting a molding material into the mold device 800; a moving device 400 for moving the injection device 300 forward and backward relative to the mold device 800; a control device 700 for controlling each component of the injection molding machine 1; and a frame 900 for supporting each component of the injection molding machine 1. The frame 900 includes a mold clamping device frame 910 for supporting the mold clamping device 100 and an injection device frame 920 for supporting the injection device 300. The mold clamping device frame 910 and the injection device frame 920 are respectively provided on the floor 2 via leveling regulators 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 1 will be described.

[0052] (Mold clamping device)

[0053] 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.

[0054] 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.

[0055] The mold clamping device 100 is horizontal, for example, and the mold opening and closing direction is the horizontal direction. The mold clamping device 100 has a fixed platen 110 for mounting the stationary 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.

[0056] The fixed platen 110 is fixed relative to the mold clamping device frame 910. The stationary mold 810 is mounted on the surface of the fixed platen 110 facing the movable platen 120.

[0057] 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. The movable mold 820 is mounted on the surface of the movable platen 120 facing the fixed platen 110.

[0058] The moving mechanism 102 performs mold closing, pressure boosting, mold clamping, pressure release, and mold opening of the mold device 800 by moving the movable platen 120 forward and backward relative to the fixed platen 110. 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 for moving the movable platen 120 relative to the toggle seat 130 in the mold opening and closing direction, a mold clamping motor 160 for operating the toggle mechanism 150, a motion conversion mechanism 170 for converting the rotational motion of the mold clamping motor 160 into a linear motion, and a mold thickness adjustment mechanism 180 for adjusting the interval between the fixed platen 110 and the toggle seat 130.

[0059] 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 a 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.

[0060] 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.

[0061] The connecting rod 140 connects and fixes the fixed platen 110 and the toggle seat 130 with a gap L in the mold opening and closing direction. Multiple (e.g., 4) connecting rods 140 can be used. The multiple connecting rods 140 are arranged parallel to the mold opening and closing direction and extend according to the 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 detecting the clamping force, etc.

[0062] In addition, in the present embodiment, the connecting rod strain detector 141 is used as the clamping force detector for detecting the clamping force, but the present invention is not limited thereto. The clamping force detector is not limited to the strain type, and can also be piezoelectric, capacitive, hydraulic, electromagnetic, etc., and its installation position is not limited to the connecting rod 140.

[0063] The toggle mechanism 150 is disposed between the movable platen 120 and the toggle seat 130, and moves the movable platen 120 relative to the toggle seat 130 in the mold opening and closing direction. The toggle mechanism 150 has a crosshead 151 that moves in the mold opening and closing direction and a pair of link groups that flex and extend by the movement of the crosshead 151. Each of the pair of link groups has 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 seat 130. The second link 153 is mounted on the crosshead 151 via a third link 154. If the crosshead 151 is advanced and retracted relative to the toggle seat 130, the first link 152 and the second link 153 flex and extend to advance and retract the movable platen 120 relative to the toggle seat 130.

[0064] 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.

[0065] The clamping motor 160 is mounted on the toggle seat 130 and operates the toggle mechanism 150. The clamping motor 160 advances and retracts the crosshead 151 relative to the toggle seat 130, causing the first link 152 and the second link 153 to flex and extend, so as to advance and retract the movable platen 120 relative to the toggle seat 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, etc.

[0066] The motion conversion mechanism 170 converts the rotational motion of the mold 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. Ball or roller can be interposed between the lead screw shaft and the lead screw nut.

[0067] Under the control of the control device 700, the mold clamping device 100 performs operations such as a mold closing process, a pressure boosting process, a mold clamping process, a pressure releasing process, and a mold opening process.

[0068] In the mold closing process, by driving the mold clamping motor 160, the crosshead 151 advances to the mold closing end position at a set moving speed, and the movable platen 120 advances to bring the moving mold 820 into contact with the stationary mold 810. For example, a mold clamping motor encoder 161 etc. is used to detect the position and moving speed of the crosshead 151. The mold clamping motor encoder 161 detects the rotation of the mold clamping motor 160 and sends a signal representing the detection result to the control device 700.

[0069] 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 mold 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 mold clamping motor encoder 161, and conventional detectors can be used.

[0070] In the pressure boosting process, the mold clamping motor 160 is further driven to make the crosshead 151 advance from the mold closing end position to the mold clamping position, thereby generating a mold clamping force.

[0071] In the mold clamping process, the mold 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 pressure 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. By curing the filled molding material, a molded product is obtained.

[0072] The number of cavity spaces 801 can be one or multiple. 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 other part of the cavity space 801 is filled with a molding material. A molded product in which the insert and the molding material are integrated can be obtained.

[0073] In the pressure releasing process, by driving the mold clamping motor 160, the crosshead 151 retreats from the mold clamping position to the mold opening start position, and the movable platen 120 retreats to reduce the mold clamping force. The mold opening start position and the mold closing end position can be the same position.

[0074] In the mold opening process, the crosshead 151 is driven by the mold closing motor 160 to retreat from the mold opening start position to the mold opening end position at a set moving speed, and the movable platen 120 is retreated 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.

[0075] The set conditions in the mold closing process, the pressure boosting process, and the mold clamping process are uniformly set as a series of set conditions. For example, the moving speed, position (including the mold closing start position, the moving speed switching position, the mold closing end position, and the mold clamping position), and the mold clamping force of the crosshead 151 in the mold closing process and the pressure boosting process are uniformly set as a series of set conditions. The mold closing start position, the moving speed switching position, the mold closing end position, and the mold clamping position are arranged in sequence from the rear to the front, and represent the starting point and the ending point of the interval where the set moving speed is indicated. The moving speed is set for each interval. The moving speed switching position can be one or more. The moving speed switching position may not be set. Only either the mold clamping position or the mold clamping force may be set.

[0076] The set conditions in the pressure releasing process and the mold opening process are also set in the same manner. For example, the moving speed, position (the mold opening start position, the moving speed switching position, and the mold opening end position) of the crosshead 151 in the pressure releasing process and the mold opening process are uniformly set as a series of set conditions. The mold opening start position, the moving speed switching position, and the mold opening end position are arranged in sequence from the front to the rear, and represent the starting point and the ending point of the interval where the set moving speed is indicated. The moving speed is set for each interval. The moving speed switching position can be one or more. The moving speed switching position may not be set. The mold opening start position and the mold closing end position may be the same position. Also, the mold opening end position and the mold closing start position may be the same position.

[0077] In addition, instead of the moving speed, position, etc. of the crosshead 151, the moving speed, position, etc. of the movable platen 120 may 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 may be set.

[0078] However, the toggle mechanism 150 amplifies the driving force of the mold closing motor 160 and transmits it to the movable platen 120. Its magnification ratio is also referred to as 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 referred to as the "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.

[0079] 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., the mold thickness is adjusted to obtain a specified 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.

[0080] The mold clamping device 100 is provided with a mold thickness adjustment mechanism 180. The mold thickness adjustment mechanism 180 adjusts the interval L between the fixed platen 110 and the toggle seat 130, thereby adjusting the mold thickness. In addition, regarding the timing of the 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 adjustment mechanism 180, for example, includes: a lead screw shaft 181 formed at the rear end of the connecting rod 140; a lead screw nut 182 that is rotatably held and non-advancing / retreating in the toggle seat 130; and a mold thickness adjustment motor 183 that rotates the lead screw nut 182 screwed with the lead screw shaft 181.

[0081] 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 adjustment motor 183 can be transmitted to a plurality of lead screw nuts 182 via a rotational driving force transmission unit 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 unit 185, the plurality of lead screw nuts 182 can be rotated individually.

[0082] The rotational driving force transmission unit 185 is constituted by, for example, gears or the like. At this time, driven gears are formed on the outer circumferences of the respective lead screw nuts 182, a driving gear is mounted on the output shaft of the mold thickness adjustment motor 183, and an intermediate gear that meshes with the plurality of driven gears and the driving gear is rotatably held at the center of the toggle seat 130. In addition, instead of gears, the rotational driving force transmission unit 185 can also be constituted by a belt, pulleys, or the like.

[0083] The operation of the mold thickness adjustment mechanism 180 is controlled by the control device 700. The control device 700 drives the mold thickness adjustment 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 adjustment mechanisms can be used in combination.

[0084] The interval L is detected using the die thickness adjustment motor encoder 184. The die thickness adjustment motor encoder 184 detects the amount of rotation and the direction of rotation of the die thickness adjustment motor 183, and sends a signal representing the detection result to the control device 700. The detection result of the die thickness adjustment 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 die thickness adjustment motor encoder 184, and conventional detectors can be used.

[0085] The mold clamping device 100 may have 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.

[0086] In addition, the mold clamping device 100 of the present embodiment is a horizontal type with the mold opening and closing direction being the horizontal direction, but it can also be a vertical type with the mold opening and closing direction being the up and down direction.

[0087] In addition, the mold clamping device 100 of the present embodiment has a mold clamping motor 160 as a driving part, but it can also have a hydraulic cylinder instead of the mold clamping motor 160. And the mold clamping device 100 has a linear motor for mold opening and closing, and it can also have an electromagnet for mold clamping.

[0088] (Ejector device)

[0089] 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 direction of the X axis) is set as the front, and the moving direction of the movable platen 120 at the time of mold opening (for example, the negative direction of the X axis) is set as the rear for the description.

[0090] The ejector device 200 is installed on the movable platen 120 and moves forward and backward together with the movable platen 120. The ejector device 200 has: an ejector rod 210 for ejecting the molded product from the mold device 800; and a drive mechanism 220 for moving the ejector rod 210 in the moving direction (X axis direction) of the movable platen 120.

[0091] The ejector rod 210 is configured to be able to advance and retreat 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 may or may not be connected to the ejector plate 826.

[0092] The drive mechanism 220 has, for example, an ejector motor and a motion conversion mechanism for converting 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 screwed onto the lead screw shaft. A ball or a roller may be interposed between the lead screw shaft and the lead screw nut.

[0093] The ejection device 200 performs an ejection process under the control of the control device 700. In the ejection process, the ejection rod 210 advances from the standby position to the ejection position at a set moving speed, causing the ejection plate 826 to advance to eject the molded product. Then, the ejection motor is driven to cause the ejection rod 210 to retreat at a set moving speed, causing the ejection plate 826 to retreat to the original standby position.

[0094] For example, an ejection motor encoder is used to detect the position and moving speed of the ejection rod 210. The ejection motor encoder detects the rotation of the ejection motor and sends a signal representing the detection result to the control device 700. In addition, the ejection rod position detector for detecting the position of the ejection rod 210 and the ejection rod moving speed detector for detecting the moving speed of the ejection rod 210 are not limited to the ejection motor encoder, and conventional detectors can be used.

[0095] (Injection device)

[0096] In the description of the injection device 300, different from the description of the 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 description.

[0097] The injection device 300 is provided on the slide base 301, and the slide base 301 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 includes, 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 advancing and retreating the screw 330; and a load detector 360 for detecting the load transmitted between the injection motor 350 and the screw 330.

[0098] 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 into, for example, granular form 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 in front of the cooler 312.

[0099] The cylinder block 310 is divided into a plurality of regions along the axial direction of the cylinder block 310 (for example, the X-axis direction). Heaters 313 and temperature detectors 314 are respectively provided in the plurality of regions. Set temperatures are respectively set for the plurality of regions, and the control device 700 controls the heaters 313 so that the detected temperature of the temperature detectors 314 becomes the set temperature.

[0100] The nozzle 320 is provided at the front end of the cylinder block 310 and presses the mold device 800. Heaters 313 and temperature detectors 314 are provided on the outer periphery of the nozzle 320. The control device 700 controls the heaters 313 so that the detected temperature of the nozzle 320 becomes the set temperature.

[0101] The screw 330 is configured to be rotatable and reciprocable within the cylinder block 310. If the screw 330 is rotated, the molding material is conveyed forward along the spiral grooves of the screw 330. As the molding material is conveyed forward, it is gradually melted by the heat from the cylinder block 310. As the liquid molding material is conveyed to the front of the screw 330 and accumulates in the front part of the cylinder block 310, the screw 330 retreats. Then, if the screw 330 is advanced, the liquid molding material accumulated in front of the screw 330 is injected from the nozzle 320 and filled into the mold device 800.

[0102] The check ring 331 is mounted at the front of the screw 330 so as to be reciprocable, and the check ring 331 functions 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.

[0103] When the screw 330 is advanced, the check ring 331 is pushed backward by the pressure of the molding material in front of the screw 330 and relatively retreats with respect to the screw 330 to a closed position where the flow path of the molding material is blocked (refer to Figure 2 ). Thereby, the molding material accumulated in front of the screw 330 is prevented from flowing backward.

[0104] On the other hand, when the screw 330 is rotated, the check ring 331 is pushed forward by the pressure of the molding material conveyed forward along the spiral 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 ). Thereby, the molding material is conveyed to the front of the screw 330.

[0105] 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.

[0106] In addition, the injection device 300 may have a drive source for moving the check ring 331 relative to the screw 330 between the open position and the closed position.

[0107] 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 may be, for example, a hydraulic pump or the like.

[0108] The injection motor 350 moves the screw 330 forward and backward. A motion conversion mechanism or the like that converts 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 that engages with the lead screw shaft. A ball or a roller or the like may be provided between the lead screw shaft and the lead screw nut. The drive source for moving the screw 330 forward and backward is not limited to the injection motor 350 and may be, for example, a hydraulic cylinder or the like.

[0109] 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 in the load transmission path between the injection motor 350 and the screw 330 and detects the load acting on the load detector 360.

[0110] 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 receives from the molding material, the back pressure on the screw 330, and the pressure acting on the molding material from the screw 330, etc.

[0111] 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 at the nozzle 320. The in-mold pressure sensor is provided inside the mold device 800.

[0112] The injection device 300 performs a metering process, a filling process, a holding pressure process, etc. under the control of the control device 700. The filling process and the holding pressure process may be collectively referred to as an injection process.

[0113] 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 grooves 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 block 310, the screw 330 moves backward. For example, a metering motor encoder 341 is used to detect the rotational speed of the screw 330. The metering motor encoder 341 detects the rotation of the metering motor 340 and sends the signal indicating the detection result to the control device 700. In addition, the screw rotational speed detector for detecting the rotational speed of the screw 330 is not limited to the metering motor encoder 341, and a conventional detector can be used.

[0114] In the metering process, in order to limit the sharp backward movement of the screw 330, the injection motor 350 can be driven to apply a set back pressure to the screw 330. For example, a 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 is accumulated in front of the screw 330, the metering process ends.

[0115] The position and rotation speed of the screw 330 in the metering process are uniformly set as a series of set 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 starting point and the ending point of the interval where the set rotation speed is located. The rotation speed is set for each interval. The rotation speed switching position can be one or more. The rotation speed switching position can be not set. Also, the back pressure is set for each interval.

[0116] 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, an 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.

[0117] The position and moving speed of the screw 330 in the filling process are uniformly set as a series of set 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 starting point and the ending point of the interval where the set moving speed is located. 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 be not set.

[0118] The upper limit value of the pressure of the screw 330 is set for each interval where the moving speed of the screw 330 is set. 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.

[0119] 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 can be performed. Immediately before the V / P switching, instead of stopping the screw 330, the screw 330 can also be advanced or retracted at a very low speed. 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.

[0120] In the holding pressure process, the injection motor 350 is driven to push the screw 330 forward, and the pressure of the molding material at the front end of the screw 330 (hereinafter, also referred to as "holding pressure".) is maintained at a set pressure, and the molding material remaining in the cylinder 310 is pushed toward the mold device 800. The insufficient amount of molding material due to cooling shrinkage in the mold device 800 can be supplemented. For example, the 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.

[0121] 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.

[0122] In addition, the injection device 300 of the present embodiment is of 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.

[0123] Moreover, the injection device 300 of the present embodiment is a horizontal type with the axial direction of the cylinder 310 being the horizontal direction, but it can also be a vertical type with the axial direction of the cylinder 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.

[0124] (Moving device)

[0125] In the description of the mobile device 400, similar to the description of the injection device 300, the moving direction of the screw 330 during filling (e.g., the negative X-axis direction) is set as the front, and the moving direction of the screw 330 during metering (e.g., the positive X-axis direction) is set as the rear for the description.

[0126] The mobile device 400 moves the injection device 300 forward and backward relative to the mold device 800. Also, 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 drive source, and a hydraulic cylinder 430 as a hydraulic actuator, etc.

[0127] The hydraulic pump 410 has a first port 411 and a second port 412. The hydraulic pump 410 is a pump that can rotate bidirectionally. By switching the rotation direction of the motor 420, it sucks the working fluid (e.g., oil) from either the first port 411 or the second port 412 and discharges it from the other port to generate hydraulic pressure. Additionally, the hydraulic pump 410 can also suck the working fluid from the tank and discharge the working fluid from either the first port 411 or the second port 412.

[0128] The motor 420 operates the hydraulic pump 410. The motor 420 drives the hydraulic pump 410 with a rotation direction and rotation torque corresponding to the control signal from the control device 700. The motor 420 can be an electric motor or an electric servo motor.

[0129] 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 the first chamber and a rear chamber 436 as the second chamber. The piston rod 433 is fixed relative to the fixed platen 110.

[0130] 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.

[0131] 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.

[0132] In addition, 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 the linear motion of the injection device 300 may be used.

[0133] (Control device)

[0134] 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 the program stored in the storage medium 702. In addition, 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.

[0135] 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". In addition, the time required for one injection is also referred to as "molding cycle time" or "cycle time".

[0136] One molding cycle, for example, sequentially includes 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. 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.

[0137] 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. In this case, it can be set that the mold closing process is performed at the beginning of the molding cycle. And 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 will not leak from the nozzle 320.

[0138] In addition, a single molding cycle may have processes other than 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.

[0139] For example, before the pressure holding process ends and before the metering process starts, a pre-metering backflow process of retracting the screw 330 to a preset metering start position can be performed. 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.

[0140] Also, after the metering process ends and before the filling process starts, a post-metering backflow process of retracting the screw 330 to a preset filling start position (also referred to as an "injection start position") can be performed. 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 molding material from leaking from the nozzle 320 before the filling process starts.

[0141] The control device 700 is connected to the operation device 750 that receives the input operation 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 1 and the current state of the injection molding machine 1 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 operation 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 operation of the user on the screen and outputs a signal corresponding to the input operation 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 setting (including input of set values) of the injection molding machine 1, etc. Also, by the user operating the operation parts provided on the screen, the user can perform the actions of the injection molding machine 1 corresponding to the operation parts. In addition, the actions of the injection molding machine 1 can be, for example, the actions (including stopping) of the mold clamping device 100, the ejection device 200, the injection device 300, the moving device 400, etc. Also, the actions of the injection molding machine 1 can be the switching of the screen displayed on the touch panel 770 as the display device 760, etc.

[0142] 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-axis direction) of the mold clamping device 100 (more specifically, the fixed platen 110).

[0143] <Movable platen>

[0144] Next, use Figure 3 and Figure 4 to further explain the movable platen 120. Figure 3 is the front view of the movable platen 120. Figure 4 is the side view of the movable platen 120. In addition, in the following description, the left - right direction of observing the movable platen 120 from the front is also referred to as the operation direction and the direction opposite to the operation direction (reverse operation direction) (±Y direction). In addition, the front - rear direction of observing the movable platen 120 from the front is also referred to as the sliding direction (±X direction). In addition, the upward direction of observing the movable platen 120 from the front is also referred to as the vertical direction (+Z direction).

[0145] The movable platen 120 has a mold mounting portion 121, a support portion 122, a toggle pin connecting portion 123, and a pair of legs 124A, 124B. In addition, the mold mounting portion 121 and the support portion 122 supported by the pair of legs 124A, 124B are also referred to as the movable platen main body.

[0146] The mold mounting portion 121 has a moving mold 820 mounted on its surface. Notches 121a for the connecting rod 140 to pass through are provided at the four corners of the mold mounting portion 121.

[0147] The support portion 122 is provided at the center of the back surface of the mold mounting portion 121. The support portion 122 has a substantially square tube shape with an opening at the rear (-X direction). The driving mechanism 220 of the ejecting device 200 is disposed within the support portion 122.

[0148] The toggle pin connecting portion 123 is provided on the support portion 122. The toggle pin connecting portion 123 is connected to the first link 152 via a connecting pin. The clamping force from the clamping device 100 is transmitted to the center of the back surface side of the mold mounting portion 121 via the toggle pin connecting portion 123 and the support portion 122.

[0149] The leg 124A has a foot portion 124A1 on which a slider 105 is mounted, a first leg portion 124A2 extending vertically from the foot portion 124A1, and a second leg portion 124A3 connecting from the first leg portion 124A2 to the center in the height direction of the support portion 122.

[0150] The foot portion 124A1 is a component with the sliding direction (X direction) as the length direction, as Figure 4As shown, when viewed from the front, it is formed in a "C" shape that is open at the bottom. Additionally, on the lower surface side of the leg portion 124A1, sliders 105 that move along the guide member 101 are installed on one side in the longitudinal direction (+X direction) and the other side in the longitudinal direction (-X direction). Further, a through-hole (not shown) that penetrates from the upper surface of the leg portion 124A1 toward the lower surface of the leg portion 124A1 ( Figure 5 the lower surface S1 described later) is formed in the leg portion 124A1, and the slider 105 is fixed to the leg portion 124A1 by a bolt 106 inserted through the through-hole. Additionally, regarding the leg portion 124A1, use Figure 5 will be described later.

[0151] The first leg portion 124A2 is a member that vertically extends from approximately the center in the long side direction of the leg portion 124A1. The second leg portion 124A3 is a member that extends obliquely from the upper end of the first leg portion 124A2 toward the support portion 122. The second leg portion 124A3 is connected to the support portion 122 at a position approximately in the center in the height direction of the support portion 122. In other words, as Figure 3 shown, when viewed from the surface side of the mold mounting portion 121, the second leg portion 124A3 extends obliquely downward to the left.

[0152] Similarly, the leg portion 124B has a leg portion 124B1 on which the slider 105 is installed, a first leg portion 124B2 that vertically extends from the leg portion 124B1, and a second leg portion 124B3 that is connected to the center in the height direction of the support portion 122 from the first leg portion 124B2.

[0153] The leg portion 124B1 is a member with the sliding direction (X direction) as the longitudinal direction. As Figure 4 shown, when viewed from the front, it is formed in an "L" shape that is open at the bottom and on the right side. Additionally, on the lower surface side of the leg portion 124B1, sliders 105 that move along the guide member 101 are installed on one side in the longitudinal direction (+X direction) and the other side in the longitudinal direction (-X direction). Further, a through-hole (not shown) that penetrates from the upper surface of the leg portion 124B1 toward the lower surface of the leg portion 124B1 ( Figure 6 the lower surface S4 described later) is formed in the leg portion 124B1, and the slider 105 is fixed to the leg portion 124B1 by a bolt 106 inserted through the through-hole. Additionally, regarding the leg portion 124B1, use Figure 6 will be described later.

[0154] The first leg portion 124B2 is a member that vertically extends from approximately the center in the long side direction of the leg portion 124B1. The second leg portion 124B3 is a member that extends obliquely from the upper end of the first leg portion 124B2 toward the support portion 122. The second leg portion 124B3 is connected to the support portion 122 at a position approximately in the center in the height direction of the support portion 122. In other words, asFigure 3 As shown, when viewed from the surface side of the mold mounting portion 121, the second leg portion 124B3 extends obliquely downward to the right.

[0155] Accordingly, the leg portions 124A1 and 124B1 are disposed at positions outside the connecting rod 140 in the operation direction and the direction opposite to the operation direction. In addition, the leg portions 124A1 and 124B1 are disposed at positions outside the platen main body (mold mounting portion 121, support portion 122) in the operation direction and the direction opposite to the operation direction.

[0156] In addition, a stopper bolt mounting portion 124A4 for mounting a stopper bolt (not shown) for stopping the movement of the movable platen 120 is provided on one leg portion 124A. By locking the stopper bolt, the movable platen 120 cannot move.

[0157] In this way, the mold mounting portion 121 and the support portion 122 of the movable platen 120 are supported at positions in the center in the height direction by the leg portions 124A and 124B. Here, the heat of the mold device 800 is transferred from the mold mounting portion 121, the support portion 122 provided at the center of the back surface of the mold mounting portion 121, the leg portions 124A and 124B extending from the center in the height direction of the support portion 122, and the leg portions 124A1 and 124B1 to the mold clamping device frame 910. Accordingly, compared with a movable platen in which the leg portion is directly connected below the mold mounting portion, it is possible to suppress the temperature of the mold device 800 mounted on the mold mounting portion 121 from becoming asymmetric in the vertical direction.

[0158] Next, use Figure 5 and Figure 6 to further illustrate the leg portions 124A1 and 124B1.

[0159] Figure 5 is an enlarged view of one leg portion 124A1 of the movable platen 120. When viewed from the front, the leg portion 124A1 has a "U" shape that is open downward.

[0160] The lower surface S1 of the leg portion 124A1 abuts against the upper surface of the slider 105. In addition, the lower surface S1 that contacts the slider 105 becomes a machined surface with excellent accuracy.

[0161] In the direction opposite to the operation direction on the lower surface S1 of the leg portion 124A1 ( Figure 5On one side (the right side), there is a positioning portion 11 that protrudes downward from the lower surface S1 for positioning the slider 105 fixed to the foot portion 124A1 in the operating direction and the direction opposite to the operating direction. The positioning portion 11 is a member with the sliding direction (X direction) as the length direction and is formed at a position below the lower surface S1 of the foot portion 124A1. That is, the lower surface S11 of the positioning portion 11 is formed at a position below the lower surface S1 of the foot portion 124A1. Additionally, the operating direction of the positioning portion 11 ( Figure 5 The side surface S2 on the left side) is the surface that abuts against the slider 105. When fixing the slider 105 to the foot portion 124A1, by making the side surface on the side opposite to the operating direction ( Figure 5 The right side) of the slider 105 abut against the side surface S2 of the positioning portion 11, the positioning of the slider 105 in the operating direction and the direction opposite to the operating direction is performed. Additionally, the side surface S2 that contacts the slider 105 becomes a machined surface with excellent precision.

[0162] On the operating direction ( Figure 5 The left side) side of the lower surface S1 of the foot portion 124A1, there is a bolt support portion 12 that protrudes downward from the lower surface S1. The bolt support portion 12 is a member with the sliding direction (X direction) as the length direction and is formed at a position below the lower surface S1 of the foot portion 124A1. That is, the lower surface S12 of the bolt support portion 12 is formed at a position below the lower surface S1 of the foot portion 124A1.

[0163] Additionally, a bolt hole (not shown) that penetrates from the side surface on the operating direction ( Figure 5 The left side) to the side surface in the direction opposite to the operating direction ( Figure 5 The right side) is formed in the bolt support portion 12. A bolt 13 for pressing the slider 105 against the side surface S2 of the positioning portion 11 is screwed into this bolt hole. Additionally, the width between the side surface S2 of the positioning portion 11 and the side surface S3 of the bolt support portion 12 is formed to be slightly wider than the width of the slider 105.

[0164] By rotating the bolt 13, the front end of the bolt 13 protrudes from the side surface S3 in the direction opposite to the operating direction ( Figure 5 The right side) and presses the side surface of the slider 105. Thereby, the slider 105 is pressed against the side surface S2 of the positioning portion 11, and the positioning of the slider 105 is performed. Additionally, as Figure 5 shown, in the state where the positioning of the slider 105 has been performed, there is a gap between the side surface S3 of the bolt support portion 12 and the slider 105.

[0165] Additionally, an adjustment gasket (not shown) can be inserted between the positioning portion 11 and the slider 105. Additionally, a portion is formed in the positioning portion 11 from the direction opposite to the operating direction ( Figure 5The side facing the operation direction (on the right side of Figure 5 A bolt hole (not shown) that penetrates the side surface S2 on the left side of. When inserting an adjusting spacer between the positioning portion 11 and the sliding member 105 in this bolt hole, a bolt 14 is screwed in to form a gap between the side surface S2 of the positioning portion 11 and the sliding member 105.

[0166] In a state where the bolt 13 is loosened and the front end of the bolt 13 is separated from the side surface of the sliding member 105, by rotating the bolt 14, the front end of the bolt 14 protrudes from the side surface S2 toward the operation direction ( Figure 5 on the left side of) and presses the side surface of the sliding member 105. As a result, the sliding member 105 separates from the side surface S2 of the positioning portion 11, and a gap into which a spacer can be inserted can be formed between the side surface S2 of the positioning portion 11 and the sliding member 105. Then, the front end of the bolt 14 is buried in the side surface S2, a spacer is inserted into the gap, and the sliding member 105 is pressed toward the side surface S2 of the positioning portion 11 by the bolt 13, thereby performing positioning in a state where the spacer is inserted.

[0167] And, after performing positioning in the operation direction and the direction opposite to the operation direction, the sliding member 105 and the leg portion 124A1 are fixed by a bolt 106. In addition, a through hole (not shown) provided in the leg portion 124A1 for inserting the bolt 106 is formed with a hole having a diameter larger than the shaft diameter of the bolt 106 so that positioning adjustment can be performed.

[0168] In addition, the lower surface S11 of the positioning portion 11 and the lower surface S12 of the bolt support portion 12 protrude to the same position.

[0169] In addition, the side surface of the positioning portion 11 in the direction opposite to the operation direction ( Figure 5 on the right side of) protrudes in the direction opposite to the operation direction compared to the side surface of the leg portion 124A1 in the direction opposite to the operation direction. As a result, the thickness of the positioning portion 11 in the operation direction and the direction opposite to the operation direction becomes thicker.

[0170] In addition, the side surface of the bolt support portion 12 in the operation direction ( Figure 5 on the left side of) may also protrude in the operation direction compared to the side surface of the leg portion 124A1 in the operation direction. As a result, the thickness of the bolt support portion 12 in the operation direction and the direction opposite to the operation direction can be made thicker.

[0171] Figure 6 is an enlarged view of another leg portion 124B1 of the movable pressure plate 120. The leg portion 124B1 has an "L" shape that is open at the bottom and on the right side when viewed from the front.

[0172] The lower surface S4 of the leg portion 124B1 abuts against the upper surface of the sliding member 105. In addition, the lower surface S4 in contact with the sliding member 105 becomes a machined surface with excellent accuracy.

[0173] On the side (left side in the Figure 6 operation direction) of the lower surface S4 of the foot portion 124B1, there is a protruding portion 21 that protrudes downward from the lower surface S4. The protruding portion 21 is a member with the sliding direction (X direction) as the length direction, and is formed at a position below the lower surface S4 of the foot portion 124B1. That is, the lower surface S21 of the protruding portion 21 is formed at a position below the lower surface S1 of the foot portion 124A1. In addition, the lower surface S21 of the protruding portion 21 protrudes downward to the same position as the lower surface S11 of the positioning portion 11 and / or the lower surface S12 of the bolt support portion 12. That is, the lower surface S21 of the protruding portion 21 protrudes to the same position as the lower surface S11 of the positioning portion 11 and / or the lower surface S12 of the bolt support portion 12 (refer to Figure 3 the dashed line).

[0174] In addition, on the side of the protruding portion 21 opposite to the operation direction ( Figure 6 right side), there is a stepped portion between the side surface and the lower surface S4 of the foot portion 124B1. That is, the side surface of the protruding portion 21 on the side where the slider 105 is provided has a stepped portion composed of the side surface S5 and the side surface S6. The lower surface S4 in contact with the upper surface of the slider 105 and the side surface S5 continuous with the lower surface S4 are machined surfaces with excellent precision. On the other hand, the side surface S6 is formed in a direction farther from the slider 105 than the side surface S5, and the precision may not be improved. By forming the step of the side surface S5 and the side surface S6, the area of the machined surface with good precision can be reduced.

[0175] In addition, the protruding portion 21 is provided on the center side of the movable platen 120 of the lower surface S4 of the foot portion 124B1. That is, the protruding portion 21 protruding from the lower surface S4 of the foot portion 124B1 is provided at a position closer to the center of the movable platen 120 than the slider 105 in the operation direction and the direction opposite to the operation direction. Thereby, the width of the movable platen 120 can be suppressed.

[0176] After the slider 105 and the foot portion 124B1 are positioned in the operation direction and the direction opposite to the operation direction on the side of the foot portion 124A1, they are fixed by a bolt 106. In addition, a through hole (not shown) provided on the foot portion 124B1 for inserting the bolt 106 is formed with a hole having a diameter larger than the shaft diameter of the bolt 106 so that positioning adjustment can be performed. In addition, as Figure 6 shown, in the state where the slider 105 is positioned, there is a gap between the side surfaces S5, S6 of the protruding portion 21 and the slider 105.

[0177] With such a structure, the movable platen 120 can stand on its own with the lower surface S11 and the lower surface S21 grounded in the state of the movable platen 120 alone before the sliding member 105 and the like are installed. Thus, the movable platen 120 can be placed and made to stand on its own without using spacers or the like for adjusting the height of the left and right legs 124A and 124B. For example, in the assembly operation and maintenance operation of the movable platen 120, the movable platen 120 can be placed on the ground and made to stand on its own, so that the workability can be improved. In addition, when additional processing is performed on the movable platen 120, it can be placed on the workbench and made to stand on its own, so that the workability can be improved.

[0178] As described above, the embodiments of the injection molding machine and the like have been described, but the present invention is not limited to the above embodiments and the like, and various modifications and improvements can be made within the scope of the gist of the present invention described in the claims.

[0179] The protruding portion 21 may also be arranged symmetrically with respect to the center line of the positioning portion 11 and the movable platen 120. Thus, when the movable platen 120 is placed, it can stand more stably.

[0180] In addition, the protruding portion 21 may also be provided at a position closer to the outside of the movable platen 120 than the sliding member 105 in the operation direction and the direction opposite to the operation direction.

[0181] In addition, a plurality of protruding portions 21 may be provided. For example, in the operation direction and the direction opposite to the operation direction, they may also be provided at positions closer to the center side and the outside of the movable platen 120 than the sliding member 105. In other words, when viewed from the front, the leg portion 124B1 may also have a "U" shape.

Claims

1. A movable platen, comprising: a platen main body; and a pair of legs connected to the platen main body and having sliders connected to the lower surface. One of the legs has a positioning portion and a bolt support portion on the lower surface. The positioning portion and the bolt support portion are arranged to sandwich the slider in the operation direction and the reverse operation direction of the slider and protrude downward. A bolt hole penetrating from the side surface in the operation direction to the side surface in the reverse operation direction is formed in the bolt support portion. A bolt for pressing the slider against the side surface of the positioning portion is screwed into the bolt hole. This positioning portion protrudes downward for positioning the slider in the reverse operation direction. The other leg has a protruding portion on the lower surface, and the protruding portion protrudes to the same position as the lower surface of the positioning portion. The positioning portion is in surface contact with the surface of the slider in the reverse operation direction. There is a gap between the protruding portion and the slider connected to the other leg.

2. A movable platen, comprising: a platen main body; and a pair of legs connected to the platen main body and having sliders mounted on the lower surface. One of the legs has a positioning portion and a bolt support portion on the lower surface. The positioning portion and the bolt support portion are arranged to sandwich the slider in the operation direction and the reverse operation direction of the slider and protrude downward. A bolt hole penetrating from the side surface in the operation direction to the side surface in the reverse operation direction is formed in the bolt support portion. A bolt for pressing the slider against the side surface of the positioning portion is screwed into the bolt hole. This positioning portion protrudes downward for positioning the slider in the reverse operation direction. The other leg has a protruding portion on the lower surface, and the protruding portion protrudes to the same position as the lower surface of the positioning portion. The positioning portion is in surface contact with the surface of the slider in the reverse operation direction. There is a stepped portion between the side surface of the protruding portion and the lower surface of the other leg.

3. The movable platen according to claim 1 or 2, wherein The protruding portion and the positioning portion are symmetrically arranged with respect to the center line of the movable platen.

4. The movable platen according to claim 1 or 2, wherein The protruding portion is provided on the center side of the lower surface of the other leg of the movable platen.

5. The movable platen according to claim 1 or 2, wherein A plurality of the protruding portions are provided on the lower surface of the other leg.

6. The movable platen according to claim 5, wherein A plurality of the protruding portions are provided with the slider connected to the lower surface of the other leg therebetween.

7. The movable platen according to claim 1 or 2, wherein The legs are connected to the side surfaces of the platen main body.

8. The movable platen according to claim 1 or 2, wherein The legs have feet for connecting the sliders, The feet are arranged at positions outside the platen main body in the reverse operation direction.

Images