JP2022107765A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine comprising a cooling mechanism exhibiting an excellent cooling property with a simple structure.

SOLUTION: There is provided an injection molding machine 10 including at least an injection device 300 and a mold clamping device 100. At least either one of the injection device 300 and the mold clamping device 100 comprises movable members driven by driving sources 350, 160, and the movable members comprise fins.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to an injection molding machine.

2. Description of the Related Art Conventionally, the movable members forming an injection molding machine are cooled by an air-cooling fan or the like in order to cool the heat generated during their operation. However, there is a limit to the space in which the air cooling fan can be installed inside the injection molding machine, and there is also the problem that the number of parts increases due to the required power source, wiring, and the like. Therefore, the heat generated by the AC servomotor is cooled by placing a cover around the injection device driven by the AC servomotor, fixing the pipe and heat radiation fins to the cover, and flowing a cooling fluid through the pipe. , an electric injection molding machine that dissipates heat has been proposed (see, for example, Patent Document 1).

Japanese Utility Model Laid-Open No. 3-59820

However, in the electric injection molding machine described in Patent Document 1, since the cooling fluid is flowed to cool the housing, it is necessary to arrange facilities and pipes for water supply and drainage in various lines. can be complicated. In addition, since the heat-generating movable member is not directly cooled, there is room for improvement in cooling performance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an injection molding machine having a simple structure and a cooling mechanism with excellent cooling performance.

In order to achieve the above object, an injection molding machine according to one aspect of the present invention is an injection molding machine comprising at least an injection device and a mold clamping device,
At least one of the injection device and the mold clamping device has a movable member driven by a drive source, and the movable member has a fin.

According to one aspect of the present invention, it is possible to provide an injection molding machine having a cooling mechanism with a simple configuration and excellent cooling performance.

It is a figure which shows the state at the time of completion of mold opening of the injection molding machine which concerns on one Embodiment. It is a figure which shows the state at the time of mold clamping of the injection molding machine which concerns on one Embodiment. FIG. 4 is a diagram showing a state before the screw shaft moves in the ball screw mechanism, which is a movable member having cooling performance, according to the first embodiment; (a) is a diagram showing a ball screw of the ball screw mechanism according to the first embodiment, and (b) is a diagram showing a modification of the ball screw. FIG. 5 is a diagram showing a state after the screw shaft has moved in the ball screw mechanism, which is a movable member having cooling performance, according to the first embodiment; It is a figure showing the 1st modification of the ball screw mechanism concerning a 1st embodiment. It is a figure which shows the 2nd modification of the ball screw mechanism which concerns on 1st Embodiment. It is a figure showing the 3rd modification of the ball screw mechanism concerning a 1st embodiment. It is a figure which shows the ball screw mechanism which is a movable member which has the cooling performance which concerns on 2nd Embodiment. FIG. 10 is a diagram showing another application example of the ball screw mechanism, which is a movable member having cooling performance, according to the second embodiment;

Hereinafter, an injection device according to an embodiment will be described with reference to the accompanying drawings. In addition, in the present specification and drawings, substantially the same components may be denoted by the same reference numerals, thereby omitting duplicate descriptions.

[Injection molding machine according to the embodiment]
First, with reference to FIGS. 1 and 2, the schematic configuration of the entire injection molding machine according to the embodiment will be described. 1 and 2, the X direction, Y direction, and Z direction are directions perpendicular to each other. Specifically, the X and Y directions are horizontal, and the Z direction is vertical. The X direction is the same direction as the moving direction of the movable platen 120 and the injection device 300 of the injection molding machine 10 and the mold opening/closing direction, and the Y direction is the width direction of the injection molding machine 10 . When the mold clamping device 100 is of a horizontal type, the X direction is the mold opening/closing direction, and the Y direction is the width direction of the injection molding machine 10 .

(Overall configuration of injection molding machine)
FIG. 1 is a diagram showing a state of the injection molding machine according to the embodiment when mold opening is completed, and FIG. 2 is a diagram showing a state of the injection molding machine according to the embodiment when the molds are closed. 1 and 2, the X, Y and Z directions are perpendicular to each other. The X and Y directions represent horizontal directions, and the Z direction represents vertical directions. When the mold clamping device 100 is of a horizontal type, the X direction is the mold opening/closing direction, and the Y direction is the width direction of the injection molding machine 10 . As shown in FIGS. 1 and 2, the injection molding machine 10 has a mold clamping device 100, an ejector device 200, an injection device 300, a moving device 400, a control device 700, and a frame 900. Each component of the injection molding machine 10 will be described below.

(mold clamping device)
In the description of the mold clamping device 100, the moving direction of the movable platen 120 when the mold is closed (the right direction in FIGS. 1 and 2) is defined as the front, and the moving direction of the movable platen 120 when the mold is opened (the left direction in FIGS. 1 and 2). direction) is described as backward.

The mold clamping device 100 performs mold closing, mold clamping, and mold opening of the mold device 800 . The mold clamping device 100 is of a horizontal type, for example, and the mold opening/closing direction is horizontal. The mold clamping device 100 has a stationary platen 110 , a movable platen 120 , a toggle support 130 , tie bars 140 , a toggle mechanism 150 , a mold clamping motor 160 , a motion converting mechanism 170 and a mold thickness adjusting mechanism 180 .

Stationary platen 110 is fixed relative to frame 900 . A stationary mold 810 is attached to the surface of the stationary platen 110 facing the movable platen 120 .

The movable platen 120 is movable relative to the frame 900 in the mold opening/closing direction. A guide 101 for guiding the movable platen 120 is laid on the frame 900 . A movable die 820 is attached to the surface of the movable platen 120 facing the fixed platen 110 .

Mold closing, mold clamping, and mold opening are performed by moving the movable platen 120 back and forth with respect to the stationary platen 110 . A mold device 800 is composed of a fixed mold 810 and a movable mold 820 .

The toggle support 130 is connected to the stationary platen 110 with a gap therebetween and is mounted on the frame 900 so as to be movable in the mold opening/closing direction. Note that the toggle support 130 may be movable along a guide laid on the frame 900 . The guides of the toggle support 130 may be common with the guides 101 of the movable platen 120 .

In this embodiment, the stationary platen 110 is fixed to the frame 900, and the toggle support 130 is movable relative to the frame 900 in the mold opening/closing direction. 110 may be movable relative to the frame 900 in the mold opening/closing direction.

The tie bar 140 connects the stationary platen 110 and the toggle support 130 with a gap L in the mold opening/closing direction. A plurality of (for example, four) tie bars 140 may be used. Each tie bar 140 is parallel to the mold opening/closing direction and extends according to the mold clamping force. At least one tie bar 140 may be provided with a tie bar strain detector 141 that detects strain of the tie bar 140 . Tie-bar distortion detector 141 sends a signal indicating the detection result to control device 700 . The detection result of the tie bar strain detector 141 is used for detection of mold clamping force and the like.

In this embodiment, the tie bar strain detector 141 is used as a mold clamping force detector that detects the mold clamping force, but the present invention is not limited to this. The mold clamping force detector is not limited to the strain gauge type, but may be of piezoelectric type, capacitive type, hydraulic type, electromagnetic type, etc., and its mounting position is not limited to the tie bar 140 either.

The toggle mechanism 150 is arranged between the movable platen 120 and the toggle support 130 and moves the movable platen 120 relative to the toggle support 130 in the mold opening/closing direction. The toggle mechanism 150 is composed of a crosshead 151, a pair of link groups, and the like. Each link group has a first link 152 and a second link 153 that are connected with a pin or the like so as to be bendable and stretchable. The first link 152 is swingably attached to the movable platen 120 with a pin or the like, and the second link 153 is swingably attached to the toggle support 130 with a pin or the like. A second link 153 is attached to the crosshead 151 via a third link 154 . When the crosshead 151 advances and retreats with respect to the toggle support 130 , the first link 152 and the second link 153 bend and stretch, and the movable platen 120 advances and retreats with respect to the toggle support 130 .

Note that the configuration of the toggle mechanism 150 is not limited to the configuration shown in FIGS. 1 and 2 . For example, in FIGS. 1 and 2, the number of nodes in each link group is five, but the number may be four, and one end of the third link 154 is coupled to the node between the first link 152 and the second link 153. may be

The mold clamping motor 160 is attached to the toggle support 130 and operates the toggle mechanism 150 . The mold clamping motor 160 advances and retreats the crosshead 151 with respect to the toggle support 130 , thereby bending and stretching the first link 152 and the second link 153 to advance and retreat the movable platen 120 with respect to the toggle support 130 . The mold clamping motor 160 is directly connected to the motion conversion mechanism 170, but may be connected to the motion conversion mechanism 170 via a belt, pulley, or the like.

The motion conversion mechanism 170 converts rotary motion of the mold clamping motor 160 into linear motion of the crosshead 151 . The motion converting mechanism 170 includes a threaded shaft 171 and a threaded nut 172 screwed onto the threaded shaft 171 . Balls or rollers may be interposed between the screw shaft 171 and the screw nut 172 .

The mold clamping device 100 performs a mold closing process, a mold clamping process, a mold opening process, etc. under the control of the control device 700 .

In the mold closing process, the mold clamping motor 160 is driven to advance the crosshead 151 at a set speed to the mold closing completion position, thereby advancing the movable platen 120 and bringing the movable mold 820 into contact with the fixed mold 810 . The position and speed of the crosshead 151 are detected using, for example, a mold clamping motor encoder 161 or the like. The mold clamping motor encoder 161 detects rotation of the mold clamping motor 160 and sends a signal indicating the detection result to the control device 700 . The crosshead position detector for detecting the position of the crosshead 151 and the crosshead speed detector for detecting the speed of the crosshead 151 are not limited to the mold clamping motor encoder 161, and general ones can be used. Further, the movable platen position detector for detecting the position of the movable platen 120 and the movable platen speed detector for detecting the speed of the movable platen 120 are not limited to the mold clamping motor encoder 161, and general ones can be used.

In the mold clamping process, the mold clamping motor 160 is further driven to further advance the crosshead 151 from the mold closing completion position to the mold clamping position, thereby generating a mold clamping force. A cavity space 801 (see FIG. 2) is formed between the movable mold 820 and the fixed mold 810 during mold clamping, and the injection device 300 fills the cavity space 801 with a liquid molding material. A molded product is obtained by solidifying the filled molding material. A plurality of cavity spaces 801 may be provided, in which case a plurality of molded products can be obtained at the same time.

In the mold opening process, the mold clamping motor 160 is driven to retract the crosshead 151 at a set speed to the mold opening completion position, thereby retracting the movable platen 120 and separating the movable mold 820 from the fixed mold 810 . After that, the ejector device 200 ejects the molded product from the movable mold 820 .

The setting conditions in the mold closing process and the mold clamping process are collectively set as a series of setting conditions. For example, the speed and position of the crosshead 151 in the mold closing process and the mold clamping process (including the mold closing start position, speed switching position, mold closing completion position, and mold clamping position), and the mold clamping force are set as a series of setting conditions. , are set together. The mold closing start position, speed switching position, mold closing completion position, and mold clamping position are arranged in this order from the rear side to the front side, and represent the start point and end point of the section in which the speed is set. A speed is set for each section. The number of speed switching positions may be one or plural. The speed switching position may not be set. Only one of the mold clamping position and the mold clamping force may be set.

The setting conditions in the mold opening process are also set in the same manner. For example, the speed and position of the crosshead 151 (including the mold opening start position, speed switching position, and mold opening completion position) in the mold opening process are collectively set as a series of setting conditions. The mold opening start position, the speed switching position, and the mold opening completion position are arranged in this order from the front side to the rear side, and represent the start point and end point of the section in which the speed is set. A speed is set for each section. The number of speed switching positions may be one or plural. The speed switching position may not be set. The mold opening start position and the mold closing position may be the same position. Also, the mold opening completion position and the mold closing start position may be the same position.

Incidentally, instead of the speed and position of the crosshead 151, the speed and position of the movable platen 120 may be set. Also, the mold clamping force may be set instead of the position of the crosshead (for example, mold clamping position) or the position of the movable platen.

By the way, the toggle mechanism 150 amplifies the driving force of the mold clamping motor 160 and transmits it to the movable platen 120 . The amplification factor is also called toggle factor. The toggle magnification changes according to the angle θ formed between the first link 152 and the second link 153 (hereinafter also referred to as “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 magnification becomes maximum.

When the thickness of the mold apparatus 800 changes due to replacement of the mold apparatus 800 or temperature change of the mold apparatus 800, mold thickness adjustment is performed so that a predetermined mold clamping force can be obtained during mold clamping. In the mold thickness adjustment, for example, the distance L between the fixed platen 110 and the toggle support 130 is adjusted so that the link angle θ of the toggle mechanism 150 becomes a predetermined angle when the movable mold 820 touches the fixed mold 810 . to adjust.

The mold clamping device 100 has a mold thickness adjustment mechanism 180 that adjusts the mold thickness by adjusting the distance L between the stationary platen 110 and the toggle support 130 . The mold thickness adjusting mechanism 180 rotates a threaded shaft 181 formed at the rear end of the tie bar 140, a threaded nut 182 rotatably held by the toggle support 130, and a threaded nut 182 screwed onto the threaded shaft 181. and a mold thickness adjusting motor 183 .

A threaded shaft 181 and a threaded nut 182 are provided for each tie bar 140 . Rotation of the mold thickness adjustment motor 183 may be transmitted to the plurality of screw nuts 182 via the rotation transmission portion 185 . Multiple screw nuts 182 can be rotated synchronously. By changing the transmission path of the rotation transmission part 185, it is also possible to rotate the plurality of screw nuts 182 individually.

The rotation transmission part 185 is configured by, for example, a gear. In this case, a passive gear is formed on the outer circumference of each screw nut 182, a driving gear is attached to the output shaft of the mold thickness adjusting motor 183, and an intermediate gear meshing with the plurality of passive gears and the driving gear is formed in the central portion of the toggle support 130. rotatably held. Incidentally, the rotation transmission part 185 may be configured by a belt, a pulley, or the like instead of the gear.

The operation of the mold thickness adjusting mechanism 180 is controlled by the controller 700 . The control device 700 drives the mold thickness adjustment motor 183 to rotate the screw nut 182, thereby adjusting the position of the toggle support 130 that rotatably holds the screw nut 182 with respect to the fixed platen 110. The distance L from the toggle support 130 is adjusted.

In this embodiment, the screw nut 182 is rotatably held on the toggle support 130, and the tie bar 140 on which the screw shaft 181 is formed is fixed on the fixed platen 110, but the present invention is not limited to this.

For example, screw nut 182 may be rotatably retained to stationary platen 110 and tie bar 140 may be fixed to toggle support 130 . In this case, the gap L can be adjusted by rotating the screw nut 182 .

Also, a screw nut 182 may be fixed to the toggle support 130 to hold the tie bar 140 rotatably relative to the stationary platen 110 . In this case, the interval L can be adjusted by rotating the tie bar 140 .

Furthermore, a screw nut 182 may be fixed to the stationary platen 110 to hold the tie bar 140 rotatably relative to the toggle support 130 . In this case, the interval L can be adjusted by rotating the tie bar 140 .

The interval L is detected using the mold thickness adjusting motor encoder 184 . The mold thickness adjusting motor encoder 184 detects the amount and direction of rotation 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 adjustment motor encoder 184 is used for monitoring and controlling the position and interval L of the toggle support 130 . The toggle support position detector for detecting the position of the toggle support 130 and the gap detector for detecting the gap L are not limited to the mold thickness adjusting motor encoder 184, and general ones can be used.

The mold thickness adjusting mechanism 180 adjusts the interval L by rotating one of a screw shaft 181 and a screw nut 182 that are screwed together. A plurality of mold thickness adjusting mechanisms 180 may be used, and a plurality of mold thickness adjusting motors 183 may be used.

Incidentally, the mold thickness adjusting mechanism 180 of this embodiment has a threaded shaft 181 formed on the tie bar 140 and a threaded nut 182 screwed onto the threaded shaft 181 in order to adjust the interval L, but the present invention does not include this. is not limited to

For example, the mold thickness adjustment mechanism 180 may have a tie bar temperature adjuster that adjusts the temperature of the tie bars 140 . A tie-bar temperature controller is attached to each tie-bar 140 and adjusts the temperature of the plurality of tie-bars 140 in cooperation. The higher the temperature of the tie bars 140, the longer the tie bars 140 due to thermal expansion, and the larger the interval L becomes. The temperature of multiple tie bars 140 can also be adjusted independently.

The tie-bar temperature controller includes a heater such as a heater, and adjusts the temperature of the tie-bar 140 by heating. The tie bar temperature adjuster may include a cooler such as a water cooling jacket, and adjust the temperature of tie bar 140 by cooling. A tie bar temperature controller may include both a heater and a cooler.

The mold clamping device 100 of this embodiment is a horizontal type in which the mold opening/closing direction is horizontal, but may be a vertical type in which the mold opening/closing direction is a vertical direction. A vertical mold clamping device includes a lower platen, an upper platen, a toggle support, tie bars, a toggle mechanism, a mold clamping motor, and the like. One of the lower platen and the upper platen is used as a fixed platen and the other as a movable platen. A lower mold is attached to the lower platen, and an upper mold is attached to the upper platen. A mold device is composed of the lower mold and the upper mold. The lower mold may be attached to the lower platen via a rotary table. The toggle support is arranged below the lower platen and connected to the upper platen via tie bars. The tie bar connects the upper platen and the toggle support at intervals in the mold opening/closing direction. The toggle mechanism is arranged between the toggle support and the lower platen to raise and lower the movable platen. A mold clamp motor operates a toggle mechanism. When the mold clamping device is of vertical type, the number of tie bars is usually three. The number of tie bars is not particularly limited.

Although the mold clamping device 100 of this embodiment has the mold clamping motor 160 as a drive source, the mold clamping motor 160 may be replaced by a hydraulic cylinder. Further, the mold clamping device 100 may have a linear motor for mold opening and closing and an electromagnet for mold clamping.

(ejector device)
In the description of the ejector device 200, as in the description of the mold clamping device 100, the moving direction of the movable platen 120 when the mold is closed (the right direction in FIGS. The direction (the left direction in FIGS. 1 and 2) will be described as the rear.

The ejector device 200 ejects the molded product from the mold device 800. As shown in FIG. The ejector device 200 has an ejector motor 210, a motion converting mechanism 220, an ejector rod 230, and the like.

Ejector motor 210 is attached to movable platen 120 . The ejector motor 210 is directly connected to the motion conversion mechanism 220, but may be connected to the motion conversion mechanism 220 via a belt, pulley, or the like.

The motion conversion mechanism 220 converts rotary motion of the ejector motor 210 into linear motion of the ejector rod 230 . Motion converting mechanism 220 includes a threaded shaft and a threaded nut that screws onto the threaded shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.

The ejector rod 230 can move back and forth through the through hole of the movable platen 120 . A front end portion of the ejector rod 230 contacts a movable member 830 that is disposed inside the movable mold 820 so as to be able to move back and forth. The front end of ejector rod 230 may or may not be connected to movable member 830 .

The ejector device 200 performs an ejection process under the control of the control device 700 . In the ejection process, the ejector motor 210 is driven to advance the ejector rod 230 from the standby position to the ejection position at a set speed, thereby advancing the movable member 830 and ejecting the molded product. After that, the ejector motor 210 is driven to retract the ejector rod 230 at the set speed, and the movable member 830 is retracted to the original standby position. The position and speed of the ejector rod 230 are detected using the ejector motor encoder 211, for example. The ejector motor encoder 211 detects rotation of the ejector motor 210 and sends a signal indicating the detection result to the control device 700 . Note that the ejector rod position detector for detecting the position of the ejector rod 230 and the ejector rod speed detector for detecting the speed of the ejector rod 230 are not limited to the ejector motor encoder 211, and general ones can be used.

(Injection device)
In the description of the injection device 300, unlike the description of the mold clamping device 100 and the description of the ejector device 200, the moving direction of the screw 330 during filling (the left direction in FIGS. 1 and 2) is assumed to be forward, and the screw 330 The moving direction of (rightward direction in FIGS. 1 and 2) is defined as the rearward direction.

The injection device 300 is installed on a slide base 301 that can move back and forth with respect to the frame 900 and can move back and forth with respect to the mold device 800 . The injection device 300 touches the mold device 800 and fills the cavity space 801 in the mold device 800 with the molding material. The injection device 300 has, for example, a cylinder 310, a nozzle 320, a screw 330, a metering motor 340, an injection motor 350, a pressure detector 360, and the like.

The cylinder 310 heats the molding material supplied inside from the supply port 311 . The molding material includes, for example, resin. The molding material is formed into, for example, a pellet shape and supplied to the supply port 311 in a solid state. A supply port 311 is formed in the rear portion of the cylinder 310 . A cooler 312 such as a water-cooled cylinder is provided on the outer circumference of the rear portion 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 ahead of the cooler 312 .

The cylinder 310 is divided into a plurality of zones in the axial direction of the cylinder 310 (horizontal direction in FIGS. 1 and 2). A heater 313 and a temperature detector 314 are provided in each zone. The controller 700 controls the heater 313 so that the temperature detected by the temperature detector 314 becomes the set temperature for each zone.

A nozzle 320 is provided at the front end of the cylinder 310 and pressed against the mold device 800 . A heater 313 and a temperature detector 314 are provided around the nozzle 320 . The controller 700 controls the heater 313 so that the detected temperature of the nozzle 320 becomes the set temperature.

The screw 330 is arranged in the cylinder 310 so as to be rotatable and advanceable. When the screw 330 is rotated, the molding material is sent forward along the helical groove of the screw 330 . The molding material is gradually melted by the heat from the cylinder 310 while being fed forward. The screw 330 is retracted as liquid molding material is fed forward of the screw 330 and accumulated at the front of the cylinder 310 . After that, when the screw 330 is advanced, the liquid molding material accumulated in front of the screw 330 is injected from the nozzle 320 and filled in the mold device 800 .

A backflow prevention ring 331 is movably attached to the front portion of the screw 330 as a backflow prevention valve that prevents backflow of the molding material from the front to the rear of the screw 330 when the screw 330 is pushed forward.

The anti-backflow ring 331 is pushed backward by the pressure of the molding material in front of the screw 330 when the screw 330 is advanced, and is relatively to the screw 330 until it reaches a closed position (see FIG. 2) that blocks the flow path of the molding material. fall back. This prevents the molding material accumulated in front of the screw 330 from flowing backward.

On the other hand, the anti-backflow ring 331 is pushed forward by the pressure of the molding material sent forward along the helical groove of the screw 330 when the screw 330 is rotated, and is in an open position where the flow path of the molding material is opened. (see FIG. 1) relative to the screw 330. Thereby, the molding material is sent forward of the screw 330 .

The anti-backflow ring 331 may 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 .

The injection device 300 may have a drive source for advancing and retracting the backflow prevention ring 331 with respect to the screw 330 between the open position and the closed position.

Metering motor 340 rotates 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.

The injection motor 350 advances and retreats the screw 330 . Between the injection motor 350 and the screw 330, a motion conversion mechanism or the like that converts the rotary motion of the injection motor 350 into the linear motion of the screw 330 is provided. The motion conversion mechanism has, for example, a screw shaft and a screw nut screwed onto the screw shaft. Balls, rollers, or the like may be provided between the screw shaft and the screw nut. The drive source for advancing and retreating the screw 330 is not limited to the injection motor 350, and may be, for example, a hydraulic cylinder.

Pressure detector 360 detects the pressure transmitted between injection motor 350 and screw 330 . A pressure detector 360 is provided in a force transmission path between the injection motor 350 and the screw 330 to detect the pressure acting on the pressure detector 360 .

Pressure detector 360 sends a signal indicating the detection result to controller 700 . The detection result of the pressure detector 360 is used for controlling and monitoring the pressure that the screw 330 receives from the molding material, the back pressure against the screw 330, the pressure that the screw 330 acts on the molding material, and the like.

The injection device 300 performs a weighing process, a filling process, a holding pressure process, etc. under the control of the control device 700 .

In the weighing process, the weighing motor 340 is driven to rotate the screw 330 at a set number of revolutions, and the molding material is fed forward along the helical groove of the screw 330 . Along with this, the molding material is gradually melted. The screw 330 is retracted as liquid molding material is fed forward of the screw 330 and accumulated at the front of the cylinder 310 . The number of rotations of the screw 330 is detected using a metering motor encoder 341, for example. Weighing motor encoder 341 detects the rotation of weighing motor 340 and sends a signal indicating the detection result to control device 700 . Incidentally, the screw rotation speed detector for detecting the rotation speed of the screw 330 is not limited to the weighing motor encoder 341, and a general one can be used.

During the metering process, the injection motor 350 may be driven to apply a set back pressure to the screw 330 to limit its rapid retraction. The back pressure on screw 330 is detected using pressure detector 360, for example. Pressure detector 360 sends a signal indicating the detection result to controller 700 . The metering process is completed when the screw 330 is retracted to the metering completion position and a predetermined amount of molding material is accumulated in front of the screw 330 .

In the filling process, the injection motor 350 is driven to advance the screw 330 at a set 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 . The position and speed of the screw 330 are detected using an injection motor encoder 351, for example. The injection motor encoder 351 detects rotation of the injection motor 350 and sends a signal indicating the detection result to the control device 700 . When the position of the screw 330 reaches the set position, switching from the filling process to the holding pressure process (so-called V/P switching) is performed. A position at which V/P switching is performed is also called a V/P switching position. The set speed of the screw 330 may be changed according to the position of the screw 330, time, and the like.

After the position of the screw 330 reaches the set position in the filling process, the screw 330 may be temporarily stopped at the set position, and then the V/P switching may be performed. Immediately before the V/P switching, instead of stopping the screw 330, the screw 330 may be moved forward or backward slowly. Moreover, the screw position detector for detecting the position of the screw 330 and the screw speed detector for detecting the speed of the screw 330 are not limited to the injection motor encoder 351, and general ones can be used.

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 the set pressure. The remaining molding material is pushed toward the mold device 800 . A shortage of molding material due to cooling shrinkage in the mold apparatus 800 can be replenished. The holding pressure is detected using a pressure detector 360, for example. Pressure detector 360 sends a signal indicating the detection result to controller 700 . The set value of the holding pressure may be changed according to the elapsed time from the start of the holding pressure process.

In the holding pressure process, the molding material in the cavity space 801 inside the mold apparatus 800 is gradually cooled, and when the holding pressure process is completed, the entrance of the cavity space 801 is closed with the solidified molding material. This state is called a gate seal, and prevents the molding material from flowing back from the cavity space 801 . After the holding pressure process, the cooling process is started. In the cooling process, the molding material inside the cavity space 801 is solidified. A weighing step may be performed during the cooling step to reduce molding cycle time.

Although the injection device 300 of this embodiment is of the in-line screw type, it may be of a pre-plastic type or the like. A pre-plastic injection apparatus supplies molding material melted in a plasticizing cylinder to an injection cylinder, and injects the molding material from the injection cylinder into a mold apparatus. A screw is arranged rotatably or rotatably and forwards and backwards within the plasticizing cylinder, and a plunger is arranged movably forwards and backwards within the injection cylinder.

Further, the injection apparatus 300 of the present embodiment is a horizontal type in which the axial direction of the cylinder 310 is horizontal, but may be a vertical type in which the axial direction of the cylinder 310 is vertical. The mold clamping device combined with the vertical injection device 300 may be either vertical or horizontal. Similarly, the mold clamping device combined with the horizontal injection device 300 may be horizontal or vertical.

(moving device)
In the description of the moving device 400, as in the description of the injection device 300, the moving direction of the screw 330 during filling (the left direction in FIGS. The right direction in FIG. 2) will be described as the rear.

The moving device 400 moves the injection device 300 forward and backward with respect to the mold device 800 . Further, the moving device 400 presses the nozzle 320 against the mold device 800 to generate nozzle touch pressure. The moving device 400 includes a hydraulic pump 410, a motor 420 as a drive source, a hydraulic cylinder 430 as a hydraulic actuator, and the like.

Hydraulic pump 410 has a first port 411 and a second port 412 . The hydraulic pump 410 is a bi-directional rotatable pump, and by switching the rotation direction of the motor 420, hydraulic fluid (for example, oil) is sucked from one of the first port 411 and the second port 412 and discharged from the other. to generate hydraulic pressure. The hydraulic pump 410 can also suck working fluid from the tank and discharge the working fluid from either the first port 411 or the second port 412 .

Motor 420 operates hydraulic pump 410 . Motor 420 drives hydraulic pump 410 with a rotational direction and a rotational torque according to a control signal from control device 700 . Motor 420 may be an electric motor or may be an electric servomotor.

The hydraulic cylinder 430 has a cylinder body 431 , a piston 432 and a piston rod 433 . The cylinder body 431 is fixed with respect to the injection device 300 . The piston 432 partitions the inside of the cylinder body 431 into a front chamber 435 as a first chamber and a rear chamber 436 as a second chamber. Piston rod 433 is fixed relative to stationary platen 110 .

The front chamber 435 of the hydraulic cylinder 430 is connected to the first port 411 of the hydraulic pump 410 via the first flow path 401 . The hydraulic fluid discharged from the first port 411 is supplied to the front chamber 435 through the first flow path 401, thereby pushing the injection device 300 forward. The injection device 300 is advanced and the nozzle 320 is pressed against the stationary mold 810 . The front chamber 435 functions as a pressure chamber that generates nozzle touch pressure of the nozzle 320 by the pressure of the hydraulic fluid supplied from the hydraulic pump 410 .

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 the second flow path 402 . The hydraulic fluid discharged from the second port 412 is supplied to the rear chamber 436 of the hydraulic cylinder 430 through the second flow path 402, thereby pushing the injection device 300 rearward. The injection device 300 is retracted and the nozzle 320 is separated from the stationary mold 810 .

Although the moving device 400 includes the hydraulic cylinder 430 in this embodiment, the present invention is not limited to this. For example, instead of the hydraulic cylinder 430, an electric motor and a motion conversion mechanism that converts the rotary motion of the electric motor to the linear motion of the injection device 300 may be used.

(Control device)
The control device 700 is composed of, for example, a computer, and has a CPU (Central Processing Unit) 701, a storage medium 702 such as a memory, an input interface 703, and an output interface 704, as shown in FIGS. The control device 700 performs various controls by causing the CPU 701 to execute programs stored in the storage medium 702 . The control device 700 also receives signals from the outside through an input interface 703 and transmits signals to the outside through an output interface 704 .

The control device 700 repeatedly manufactures a molded product by repeatedly performing a mold closing process, a mold clamping process, a mold opening process, and the like. Further, the control device 700 performs a weighing process, a filling process, a holding pressure process, etc. between the mold clamping processes. A series of operations for obtaining a molded product, for example, the operation from the start of the weighing process to the start of the next weighing process, is also called "shot" or "molding cycle". The time required for one shot is also called "molding cycle time".

One molding cycle has, for example, a weighing process, a mold closing process, a mold clamping process, a filling process, a holding pressure process, a cooling process, a mold opening process, and an ejecting process in this order. The order here is the order of the start of each step. The filling process, holding pressure process, and cooling process are performed from the start of the mold clamping process to the end of the mold clamping process. The end of the mold closing process coincides with the start of the mold opening process. In addition, in order to shorten the molding cycle time, a plurality of steps may be performed at the same time. For example, the metering step may occur during the cooling step of the previous molding cycle, in which case the mold closing step may occur at the beginning of the molding cycle. The filling process may also be initiated during the mold closing process. Also, the ejecting process may be initiated during the mold opening process. If an on-off valve for opening and closing the flow path of the nozzle 320 is provided, the mold opening process may be initiated during the metering process. This is because the molding material does not leak from the nozzle 320 as long as the on-off valve closes the flow path of the nozzle 320 even if the mold opening process is started during the metering process.

The control device 700 is connected to an operation device 750 and a display device 760 . The operation device 750 receives input operations by the user and outputs signals corresponding to the input operations to the control device 700 . The display device 760 displays an operation screen corresponding to an input operation on the operation device 750 under the control of the control device 700 .

The operation screen is used for setting the injection molding machine 10 and the like. A plurality of operation screens are prepared and displayed by switching or displayed in an overlapping manner. The user sets the injection molding machine 10 (including input of set values) by operating the operation device 750 while viewing the operation screen displayed on the display device 760 .

The operation device 750 and the display device 760 may be configured by, for example, a touch panel and integrated. Although the operation device 750 and the display device 760 of this embodiment are integrated, they may be provided independently. Also, a plurality of operating devices 750 may be provided.

[Movable member having cooling performance according to the first embodiment]
Next, various embodiments of a movable member that is driven by a drive source and has a cooling performance among constituent members of each device that constitutes the injection molding machine 10 shown in FIGS. 1 and 2 will be described. . First, the movable member having cooling performance according to the first embodiment will be described with reference to FIGS. 3 to 5. FIG. FIG. 3 is a diagram showing a state before the screw shaft moves in the ball screw mechanism, which is a movable member having cooling performance, according to the first embodiment. FIG. 4(a) is a diagram showing a ball screw of the ball screw mechanism according to the first embodiment, and FIG. 4(b) is a diagram showing a modification of the ball screw. FIG. 5 is a diagram showing a state after the screw shaft has moved in the ball screw mechanism, which is a movable member having cooling performance, according to the first embodiment.

Hereinafter, with respect to the driving of the movable member, "rotation" includes rotation of less than one rotation in addition to rotation of one rotation or more. Further, the direction of rotation includes both clockwise and counterclockwise rotation when the rotating movable member is viewed from the front. In addition, "movement" means that a screw nut, a screw shaft, etc. moves forward or backward in the axial direction. included. In addition to moving in one axial direction, it also includes moving in two axial directions (advancing and retreating).

FIG. 3 shows the motion conversion mechanism 170 of the toggle mechanism 150 forming the mold clamping device 100. As shown in FIG. The motion conversion mechanism 170 shown in FIG. 3 converts the rotary motion of the mold clamping motor 160 as a drive source into linear motion of the crosshead 151 . The motion conversion mechanism 170 is a ball screw mechanism having a screw shaft 171 and a screw nut 172 screwed onto the screw shaft 171 . A screw nut 172 is fixed to the ball bearing mechanism 163. In the motion conversion mechanism 170, the rotation of the rotor 162 constituting the mold clamping motor 160 causes the ball bearing mechanism 163 and the screw nut 172 to move in the Q direction integrally with the rotor 162. rotate to That is, the screw nut 172 forming the motion converting mechanism 170 does not move but only rotates with respect to the mold clamping motor 160 and the toggle support 130 which are drive sources.

On the other hand, the screw shaft 171 forming the motion conversion mechanism 170 moves linearly in the X direction according to the rotation of the screw nut 172 in the Q direction. This movement of the screw shaft 171 also causes the crosshead 151 to move (linearly move) in the X direction. By moving the crosshead 151 in the X direction, a link group consisting of a third link 154, a second link 153, and a first link 152, which are connected by pins or the like so as to be bendable and stretchable, is moved, and the toggle support 130 is moved. The movable platen 120 is moved in the mold opening/closing direction.

As shown in FIGS. 3, 4(a), (b), and 5, on the side surface of the tip side of the screw shaft 171 forming the motion converting mechanism 170, there are spaced apart in the axial direction of the screw shaft 171, A plurality of flat fins 174 are attached.

Further, as shown in FIGS. 3 and 4A, a plurality of flat plate-like fins 173 are attached to the screw nut 172 at intervals in the Q direction (the circumferential direction of the screw nut 172), which is the direction of rotation. It is

FIG. 4(b) shows a modification of the fins attached to the screw nut 172. As shown in FIG. The modified fins 173A are spiral fins that are spaced around the screw nut 172 .

As shown in FIGS. 4A and 4B, the screw shaft 171 has fins 174 on the side surface on the end side, so that the fins 174 are cooled by the outside air, and the screw shaft 171 is cooled through the fins 174. can. Furthermore, by moving the screw shaft 171 in the X direction, the fins 174 and the screw shaft 171 are cooled by the outside air in a process in which the outside air meanders through the plurality of fins 174 in the R1 direction. The meandering outside air is also provided to the lead screw nut 173 located downstream of the meandering outside air, and cools the lead screw nut 173 .

In particular, since a plurality of fins 174 are mounted at intervals in the X direction, which is the moving direction of the screw shaft 171, the above-described meandering of the outside air can be easily generated when the screw shaft 171 moves, and the cooling performance is improved. becomes higher.

On the other hand, as shown in FIG. 4( a ), by having the fins 173 on the outer peripheral surface of the screw nut 172 , the fins 173 are cooled by the outside air, and the screw nut 172 can be cooled via the fins 173 . Furthermore, by rotating the screw nut 172 in the Q direction, the fins 173 and the screw nut 172 are cooled by the outside air in the process in which the outside air meanders through the plurality of fins 173 in the R2 direction.

In particular, since a plurality of fins 173 are mounted at intervals in the Q direction (circumferential direction), which is the rotational direction of the screw nut 172, the meandering of the outside air described above occurs when the screw nut 172 rotates. It is easy to use and has high cooling performance.

In addition, as shown in FIG. 4B, when the screw nut 172 has spiral fins 173A, the rotation of the screw nut 172 in the Q direction causes the outside air to flow into the spiral of the plurality of spiral fins 173A. The fin 173 and the screw nut 172 are cooled by the outside air in the process of flowing in the R3 direction. In particular, since the fins 173A have a spiral shape, the outside air flows more smoothly, and more outside air can be supplied to the screw nut 172, thereby improving the cooling performance.

The fins 174 may be formed integrally with the screw shaft 171, or may be formed separately from the screw shaft 171 and then assembled by fitting or the like. Further, the fins 173 may be molded integrally with the screw nut 172, or may be molded separately and then fixed by adhesion or the like.

In this way, by mounting the fins 174, 173, 173A on both the screw shaft 171 and the screw nut 172 forming the motion conversion mechanism 170, which are driven by the rotation of the mold clamping motor 160, which is a drive source, the drive The screw shaft 171 and the screw nut 172, which generate heat during the operation, can be cooled by their own rotation and movement. Further, both the screw shaft 171 and the screw nut 171 have a simple structure having fins 174, 173, and 173A, respectively, and since the screw shaft 171 and the screw nut 171, which are movable members, are directly cooled, the cooling performance is improved. get better. Although illustration is omitted, for example, only the screw nut 172 may have the fins 173 and 173A, and the screw shaft 171 may not have the fins 174. A motion conversion mechanism may be employed.

[First Modification of Ball Screw Mechanism According to First Embodiment]
Next, a first modification of the ball screw mechanism according to the first embodiment will be described with reference to FIG. FIG. 6 is a diagram showing a first modification of the ball screw mechanism according to the first embodiment.

A ball screw mechanism 170A shown in FIG. 6 has a housing 175 made of metal or resin. The housing 175 is fixed to the toggle support 130 by bolting, welding, bonding, or the like.

A screw nut 172 that rotates in the Q direction without moving is housed inside the housing 175 . An opening 175a is formed in the end surface of the housing 175 opposite to the mold clamping motor 160, and the screw shaft 171 is disposed through the opening 175a so as to be movable in the X direction. Grease or the like is provided to the screw shaft 171 and the screw nut 172 for maintenance, but the rotation of the screw nut 172 may cause the grease to scatter around. By surrounding the screw nut 172 with the housing 175 as in the illustrated example, it is possible to suppress the grease from scattering around.

The presence of the housing 175 suppresses the grease from scattering, while making it easier for the heat generated by the rotating screw nut 172 and the moving screw shaft 171 to accumulate inside the housing 175 . However, since the screw nut 172 has a plurality of fins 173 spaced apart in the Q direction, which is the rotational direction, each fin 173 is cooled by, for example, the outside air taken in from the opening 175a. to cool the screw nut 172 . Moreover, the screw shaft 171 can also be cooled by the cooled screw nut 172 . Furthermore, the presence of the cooled fins 173 inside the housing 175 can suppress heat build-up inside the housing 175 .

[Second Modification of Ball Screw Mechanism According to First Embodiment]
Next, a second modification of the ball screw mechanism according to the first embodiment will be described with reference to FIG. FIG. 7 is a diagram showing a second modification of the ball screw mechanism according to the first embodiment.

A ball screw mechanism 170B shown in FIG. 7 also has a housing 175 made of metal or resin, like the ball screw mechanism 170A shown in FIG. The housing 175 shown in FIG. 7 has fins 176 on the inner surface facing the screw nut 172 which is housed.

The cross-sectional shape of the housing 175, specifically, the cross-sectional shape formed when the housing 175 is cut in the direction orthogonal to the screw shaft 171, can be of various shapes such as a circle and a rectangle including a square. When the housing 175 has a circular cross-sectional shape, a plurality of flat plate-like fins 176 are mounted inside the circle at intervals in the circumferential direction. Further, even when the housing 175 has a rectangular cross-sectional shape, a plurality of flat plate-like fins 176 are mounted inside the four side surfaces of the rectangle at intervals in the circumferential direction over the four side surfaces. The fins 176 may have a curved surface shape instead of a flat plate shape, and may have a spiral shape as shown in FIG. 4B, for example.

By having a plurality of fins 176 on the inner surface of the housing 175, the airflow generated by the fins 173 on the outer circumference of the screw nut 172 due to the rotation of the screw nut 172 is directed to the fins 176 on the inner surface of the housing 175. A convection can be generated by the collision of the air currents. The convection generated within the housing 175 in this manner can effectively cool the entire screw nut 172 and the entire screw shaft 171 within the housing 175 .

[Third Modification of Ball Screw Mechanism According to First Embodiment]
Next, a third modification of the ball screw mechanism according to the first embodiment will be described with reference to FIG. FIG. 8 is a diagram showing a third modification of the ball screw mechanism according to the first embodiment.

The ball screw mechanism 170C shown in FIG. 8 also has a metal or resin housing 175, similar to the ball screw mechanism 170B shown in FIG. is doing. In the ball screw mechanism 170C, in addition to the fins 176 formed on the inner surface of the housing 175, a plurality of fins 177 are also formed on the outer surface.

The plurality of fins 177 formed on the outer surface may be provided at positions corresponding to the plurality of fins 176 on the inner surface, or may be arranged in a staggered manner relative to the plurality of fins 176 on the inner surface. .

In addition to having a plurality of fins 176 on the inner surface of the housing 175, a plurality of fins 177 are provided on the outer surface, so that the fins 177 on the outer surface absorb cold heat cooled by the outside air to the fins on the inner surface. 176 to cool the fins 176 . Inside the housing 175, the rotation of the screw nut 172 causes the airflow generated by the fins 173 on the outside of the screw nut 172 to collide with the fins 176 on the inner surface of the housing 175, and the collision of the airflow generates gas convection. can be made At this time, the gas collides with the fins 176 that are cooled by the transmission of cold heat, so that the cooled gas can be caused to convect within the housing 175 . Therefore, the convection of this cooled gas makes it possible to cool the entire screw nut 172 and the entire screw shaft 171 inside the housing 175 more effectively.

[Ball screw mechanism as a movable member having cooling performance according to the second embodiment]
Next, a ball screw mechanism, which is a movable member having cooling performance according to a second embodiment, will be described with reference to FIG. FIG. 9 is a diagram showing a ball screw mechanism, which is a movable member having cooling performance, according to the second embodiment.

In a ball screw mechanism 170D shown in FIG. 9, a screw shaft 171A is rotatably fixed to a rotor 162 that constitutes a mold clamping motor 160. As shown in FIG. A ball bearing mechanism 163 is attached to the toggle support 130, and the screw shaft 171A is rotatably inserted through the ball bearing mechanism 163. As shown in FIG.

In the ball screw mechanism 170D, unlike the ball screw mechanisms 170 to 170C, the rotation of the rotor 162 constituting the mold clamping motor 160 causes the ball bearing mechanism 163 and the screw shaft 171A to rotate together with the rotor 162 in the Q direction. That is, the screw shaft 171A forming the motion converting mechanism 170D does not move but only rotates with respect to the mold clamping motor 160 and the toggle support 130, which are drive sources.

On the other hand, the screw nut 172A forming the motion conversion mechanism 170D moves linearly in the X direction according to the rotation of the screw shaft 171A in the Q direction. A crosshead 151 is attached to the screw nut 172A. The movement of the screw nut 172A also causes the crosshead 151 to move (linearly move) in the X direction. By moving the crosshead 151 in the X direction, a link group consisting of a third link 154, a second link 153, and a first link 152, which are connected by pins or the like so as to be bendable and stretchable, is moved, and the toggle support 130 is moved. The movable platen 120 is moved in the mold opening/closing direction.

In the ball screw mechanism 170D, since the screw nut 172A is a movable member that moves, a plurality of disk-shaped fins 173B are attached to the outer periphery of the screw nut 172A at intervals in the movement direction (X direction). .

On the other hand, since the screw shaft 171A is a movable member that rotates without moving, a plurality of flat plate-like fins 174A are formed on the end side surface of the screw shaft 171A at intervals in the circumferential direction of the screw shaft 171A. is installed.

Since a plurality of fins 173B are mounted at intervals in the X direction, which is the movement direction of the screw nut 172A, meandering of outside air can be easily generated when the screw nut 172A moves, and cooling performance is improved.

On the other hand, since a plurality of fins 174A are mounted at intervals in the Q direction (circumferential direction), which is the rotational direction of the screw shaft 171A, meandering of outside air can easily occur when the screw shaft 171A rotates, thereby cooling the screw shaft 171A. Better performance.

Although illustration is omitted, the motion conversion mechanism in which the screw nut 172A moves as shown in FIG. 9 may also have a housing large enough to cover the range in which the screw nut 172A moves.

[Another application example of the ball screw mechanism according to the second embodiment]
Next, another application example of the ball screw mechanism according to the second embodiment will be described with reference to FIG. FIG. 10 is a diagram showing another application example of the ball screw mechanism according to the second embodiment.

A ball screw mechanism 370 shown in FIG. 10 is applied to an injection device 300 that constitutes the injection molding machine 10 .

First, the configuration of the injection device 300 will be described. In the injection device 300, four guide shafts 383 are installed between an injection table 381 and an injection drive table 382. The guide shafts 383 have a front slider 384 and a rear slider 385 separate from the front slider 384. , are slidably arranged. In addition, the form which does not comprise the rear slider 385 may be sufficient.

The front slider 384 is formed in a cylindrical shape having a hollow inside, and a screw coupling 387 is rotatably supported by a bearing 386 disposed in this hollow. is provided with a servomotor 340 for weighing.

A toothed driven pulley 388 is attached to the front end of the screw coupling 387, a toothed drive pulley 390 is attached to the rotor shaft 389 of the servomotor 340, and a timing is provided between the toothed driven pulley 388 and the toothed drive pulley 390. A belt 391 is stretched to form a rotation transmission mechanism.

On the other hand, the rear end of the cylinder 310 is attached to the front end surface of the injection table 381 . The cylinder 310 has a supply port 311 made up of a hopper at its rear part, and a screw 330 is inserted therein. The back pressure against screw 330 is detected using pressure detector 360 . The pressure detector 360 may be attached with a screw nut.

A front end of a screw nut 372 forming the ball screw mechanism 370 is fixed to the rear end surface of the rear slider 385 . That is, the screw nut 372 is attached to the rear end surface of the rear slider 385 , and the front slider 384 and the rear slider 385 move integrally according to the movement of the screw nut 372 .

On the other hand, the injection drive table 382 has a hollow inside, and a bearing mechanism 393 arranged in this hollow supports the rear end shaft portion of the ball screw 371 forming the ball screw mechanism 370 so as to rotate freely. do.

The injection device 300 is installed on a slide base 301 that can move back and forth in the X direction with respect to the frame 900 . By driving the injection motor 350, which is a drive source, the screw shaft 371 forming the ball screw mechanism 370 rotates in the Q direction, and the screw nut 372 is moved forward and backward in accordance with the rotation of the screw shaft 371. , the front slider 384 and the rear slider 385 move together.

A plurality of disk-shaped fins 373 are attached to the outer periphery of the moving screw nut 372 at intervals in the circumferential direction. A plurality of fins 373 are mounted at intervals in the X direction, which is the direction in which the screw nut 372 moves. becomes higher.

It should be noted that other embodiments may be possible in which other constituent elements are combined with the configurations listed in the above embodiments, and the present invention is not limited to the configurations shown here. . This point can be changed without departing from the gist of the present invention, and can be determined appropriately according to the application form. For example, the illustrated example shows an example in which fins are attached to the movable members of the ball screw mechanisms of the mold clamping device 100 and the injection device 300 that form the injection molding machine 10 . However, it is possible to attach fins to all other movable members forming the injection molding machine 10 . The movable members include the movable platen 120 forming the mold clamping device 100, the crosshead 151 and each link forming the toggle mechanism 150, the movable mold 820 forming the mold device 800, and the movement forming the ejector device 200. A conversion mechanism 220, an ejector rod 230, a cylinder 310 forming an injection device 300, and the like are included.

10 injection molding machine 100 mold clamping device 130 toggle support 150 toggle mechanism 160 mold clamping motor (driving source)
170, 170A, 170B motion conversion mechanism (ball screw mechanism)
170C, 170D motion conversion mechanism (ball screw mechanism)
171, 171A screw shaft (movable member)
172 screw nut (movable member)
173, 173A, 173B Fins 174, 174A Fin 175 Housing 176, 177 Fin 300 Injection device 350 Injection motor (driving source)
370 motion conversion mechanism (ball screw mechanism)

Hereinafter, an injection molding machine according to an embodiment will be described with reference to the accompanying drawings. In the present specification and drawings, substantially the same constituent elements may be given the same reference numerals to omit redundant description.

In addition, as shown in FIG. 4B, when the screw nut 172 has spiral fins 173A, the rotation of the screw nut 172 in the Q direction causes the outside air to flow into the spiral of the plurality of spiral fins 173A. The fin 173A and the screw nut 172 are cooled by the outside air in the process of flowing in the R3 direction. In particular, since the fins 173A have a spiral shape, the outside air flows more smoothly, and more outside air can be supplied to the screw nut 172, thereby improving the cooling performance.

In this way, by mounting fins 174, 173, and 173A on both the screw shaft 171 and the screw nut 172 forming the motion conversion mechanism 170, which are driven by the rotation of the mold clamping motor 160, which is a drive source, the drive The screw shaft 171 and the screw nut 172, which generate heat during the operation, can be cooled by their own rotation and movement. Further, both the screw shaft 171 and the screw nut 172 have a simple structure having fins 174, 173, and 173A, respectively, and since the screw shaft 171 and the screw nut 172 , which are movable members, are directly cooled, the cooling performance is improved. get better. Although illustration is omitted, for example, only the screw nut 172 may have the fins 173 and 173A, and the screw shaft 171 may not have the fins 174. A motion conversion mechanism may be employed.

On the other hand, the injection drive table 382 has a hollow inside, and a bearing mechanism 393 arranged in this hollow supports the rear end shaft portion of the screw shaft 371 forming the ball screw mechanism 370 so as to rotate freely. do.

10 injection molding machine 100 mold clamping device 130 toggle support 150 toggle mechanism 160 mold clamping motor (driving source)
170, 170A, 170B motion conversion mechanism (ball screw mechanism)
170C, 170D motion conversion mechanism (ball screw mechanism)
171, 171A screw shaft (movable member)
172 , 172A screw nut (movable member)
173, 173A, 173B Fins 174, 174A Fin 175 Housing 176, 177 Fin 300 Injection device 350 Injection motor (driving source)
370 motion conversion mechanism (ball screw mechanism)

Claims (4)

An injection molding machine comprising at least an injection device and a mold clamping device,
An injection molding machine, wherein at least one of the injection device and the mold clamping device includes a movable member driven by a drive source, and the movable member has a fin. 2. The injection molding machine according to claim 1, wherein said movable member is a screw nut or a screw shaft forming a ball screw mechanism. 3. The injection molding machine according to claim 2, wherein at least part of said ball screw mechanism is housed in a housing, and said housing has fins on an inner surface facing said ball screw mechanism. 4. The injection molding machine according to claim 2, wherein said ball screw mechanism is configured such that said screw nut rotates without moving and said screw shaft moves.

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