JP2022104257A - Injection molding machine - Google Patents

Abstract

To provide an injection molding machine that prevents dirt of an apparatus by a lubricant.SOLUTION: An injection molding machine is provided with a toggle support that is placed on a frame and supports a toggle mechanism. The toggle support has a support body and a leg part placed on a placement surface of the frame, for supporting the support body. The leg part has: a feed channel through which a lubricant is fed to a lubricated surface formed on a bottom surface; an accumulation part for accumulating the lubricant that lubricates the lubricated surface; and a suction channel through which the lubricant of the accumulation part is sucked. The accumulation part is in communication with the outside. Through the suction channel, air from the outside and the lubricant in the accumulation part are sucked.SELECTED DRAWING: Figure 3

Description

The present invention relates to an injection molding machine.

The fixed platen is fixed to the frame, the fixed platen and the toggle support are connected at intervals by tie bars arranged parallel to the mold opening / closing direction, and the legs of the toggle support are movable on the frame in the mold opening / closing direction. An injection molding machine having a structure to be mounted is known (Patent Document 1). In an injection molding machine having such a configuration, the tie bar extends according to the mold clamping force during mold clamping, so that the legs of the toggle support slide on the frame in the mold opening / closing direction.

Japanese Unexamined Patent Publication No. 2014-54748

By the way, when the lubricant is supplied to the sliding surface of the toggle support and the frame, the lubricant flowing out from the sliding surface collects under the legs of the toggle support. For this reason, in the conventional injection molding machine, the toggle support moves back and forth in the mold opening / closing direction, which causes the lubricant to scatter or drip, and the injection molding machine may be contaminated with the lubricant.

Therefore, an object of the present invention is to provide an injection molding machine that prevents the device from being contaminated by a lubricant.

The injection molding machine according to the embodiment is an injection molding machine that is mounted on a frame and includes a toggle support that supports a toggle mechanism, wherein the toggle support is a support main body and a mounting surface of the frame. The leg portion has a leg portion mounted on the support body and supports the support main body, and the leg portion has a supply path for supplying a lubricant to a lubricating surface formed on a bottom surface and a lubricant for lubricating the lubricating surface. It has an accumulating part and a suction path for sucking the lubricant of the accumulating part, the accumulating part is communicated with the outside, and the suction path has air from the outside and the lubricant of the accumulating part. And are sucked.

According to the present invention, it is possible to provide an injection molding machine that suitably lubricates a lubricated portion.

It is a figure which shows the state at the time of completion of the 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. It is a perspective view around the toggle support of an injection molding machine. It is the bottom view of the leg part of the toggle support. FIG. 3 is a sectional view taken along line AA of the legs of the toggle support. FIG. 3 is a sectional view taken along line BB of the legs and frame of the toggle support. It is a perspective view around the toggle support of an injection molding machine. It is a perspective view around the toggle support of an injection molding machine.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In each drawing, the same or corresponding configurations are designated by the same or corresponding reference numerals and the description thereof will be omitted.

FIG. 1 is a diagram showing a state at the time of completion of mold opening of the injection molding machine according to the embodiment. FIG. 2 is a diagram showing a state of the injection molding machine according to the embodiment at the time of mold clamping. In the present specification, the X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other. 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 a horizontal type, the X-axis direction is the mold opening / closing direction, and the Y-axis direction is the width direction of the injection molding machine 1. The negative side in the Y-axis direction is called the operation side, and the positive side in the Y-axis direction is called the non-operation side.

As shown in FIGS. 1 to 2, the injection molding machine 1 includes a mold clamping device 100 for opening and closing the mold device 800, an ejector device 200 for ejecting a molded product molded by the mold device 800, and a mold device 800. An injection device 300 for injecting a molding material into the mold device 800, a moving device 400 for advancing and retreating the injection device 300 with respect to the mold device 800, a control device 700 for controlling each component of the injection molding machine 1, and each of the injection molding machine 1. It has a frame 900 that supports the components. The frame 900 includes a mold clamping device frame 910 that supports the mold clamping device 100 and an injection device frame 920 that supports the injection device 300. The mold clamping device frame 910 and the injection device frame 920 are installed on the floor 2 via the leveling adjuster 930, respectively. 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.

(Molding device)
In the description of the mold clamping device 100, the moving direction of the movable platen 120 when the mold is closed (for example, the positive direction of the X axis) is defined as the front, and the moving direction of the movable platen 120 when the mold is opened (for example, the negative direction of the X axis) is described as the rear. do.

The mold clamping device 100 performs mold closing, boosting, mold clamping, depressurization, and mold opening of the mold device 800. The mold device 800 includes a fixed mold 810 and a movable mold 820.

The mold clamping device 100 is, for example, a horizontal type, and the mold opening / closing direction is the horizontal direction. The mold clamping device 100 includes a fixed platen 110 to which the fixed mold 810 is attached, a movable platen 120 to which the movable mold 820 is attached, a moving mechanism 102 for moving the movable platen 120 with respect to the fixed platen 110 in the mold opening / closing direction. Have.

The fixed platen 110 is fixed to the mold clamping device frame 910. The fixed mold 810 is attached to the surface of the fixed platen 110 facing the movable platen 120.

The movable platen 120 is movably arranged in the mold opening / closing direction with respect to the mold clamping device frame 910. A guide 101 for guiding the movable platen 120 is laid on the mold clamping device frame 910. The movable mold 820 is attached to the surface of the movable platen 120 facing the fixed platen 110.

The moving mechanism 102 advances and retracts the movable platen 120 with respect to the fixed platen 110 to close, pressurize, press the mold, depressurize, and open the mold device 800. The moving mechanism 102 moves the movable platen 120 in the mold opening / closing direction with respect to the toggle support 130 arranged at a distance from the fixed platen 110, the tie bar 140 connecting the fixed platen 110 and the toggle support 130, and the toggle support 130. A type that adjusts the distance between the fixed platen 110 and the toggle support 130, the toggle mechanism 150 that causes the toggle mechanism 150, the mold clamping motor 160 that operates the toggle mechanism 150, the motion conversion mechanism 170 that converts the rotational motion of the mold clamping motor 160 into linear motion, and the mold that adjusts the distance between the fixed platen 110 and the toggle support 130. It has a thickness adjusting mechanism 180.

The toggle support 130 is disposed at a distance from the fixed platen 110, and is movably mounted on the mold clamping device frame 910 in the mold opening / closing direction. The toggle support 130 may be movably arranged along a guide laid on the mold clamping device frame 910. The guide of the toggle support 130 may be the same as that of the guide 101 of the movable platen 120.

In the present embodiment, the fixed platen 110 is fixed to the mold clamping device frame 910, and the toggle support 130 is movably arranged with respect to the mold clamping device frame 910 in the mold opening / closing direction, but the toggle support 130 is molded. It may be fixed to the device frame 910 and the fixed platen 110 may be movably arranged with respect to the mold clamping device frame 910 in the mold opening / closing direction.

The tie bar 140 connects the fixed platen 110 and the toggle support 130 at intervals L in the mold opening / closing direction. A plurality of (for example, four) tie bars 140 may be used. The plurality of tie bars 140 are arranged parallel to the mold opening / closing direction and extend according to the mold clamping force. At least one tie bar 140 may be provided with a tie bar strain detector 141 for detecting the distortion of the tie bar 140. The tie bar strain detector 141 sends a signal indicating the detection result to the control device 700. The detection result of the tie bar strain detector 141 is used for detecting the mold clamping force and the like.

In the present embodiment, the tie bar strain detector 141 is used as the mold clamping force detector for detecting 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, and may be a piezoelectric type, a capacitive type, a hydraulic type, an electromagnetic type, or the like, and the mounting position thereof is not limited to the tie bar 140.

The toggle mechanism 150 is arranged between the movable platen 120 and the toggle support 130, and moves the movable platen 120 with respect to the toggle support 130 in the mold opening / closing direction. The toggle mechanism 150 includes a crosshead 151 that moves in the mold opening / closing direction, and a pair of links that bend and stretch due to the movement of the crosshead 151. Each of the pair of links has a first link 152 and a second link 153 that are flexibly connected by a pin or the like. The first link 152 is swingably attached to the movable platen 120 with a pin or the like. The second link 153 is swingably attached to the toggle support 130 with a pin or the like. The second link 153 is attached to the crosshead 151 via the third link 154. When the crosshead 151 is moved forward and backward with respect to the toggle support 130, the first link 152 and the second link 153 bend and stretch, and the movable platen 120 moves forward and backward with respect to the toggle support 130.

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 5, but it may be 4, and one end of the third link 154 is connected to the nodes of the first link 152 and the second link 153. May be done.

The mold clamping motor 160 is attached to the toggle support 130 and operates the toggle mechanism 150. The mold clamping motor 160 bends and stretches the first link 152 and the second link 153 by advancing and retreating the crosshead 151 with respect to the toggle support 130, and advances and retreats 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, a pulley, or the like.

The motion conversion mechanism 170 converts the rotational motion of the mold clamping motor 160 into a linear motion of the crosshead 151. The motion conversion mechanism 170 includes a screw shaft and a screw nut screwed onto the screw shaft. A ball or roller may be interposed between the screw shaft and the screw nut.

The mold clamping device 100 performs a mold closing step, a pressure increasing step, a mold clamping step, a depressurization step, a mold opening step, and the like under the control of the control device 700.

In the mold closing process, the movable platen 120 is advanced by driving the mold clamping motor 160 to advance the crosshead 151 to the mold closing completion position at the set moving speed, and the movable mold 820 is touched with the fixed mold 810. .. The position and moving speed of the crosshead 151 are detected by using, for example, a mold clamping motor encoder 161. The mold clamping motor encoder 161 detects the rotation of the mold clamping motor 160, and sends a signal indicating the detection result to the control device 700.

The crosshead position detector that detects the position of the crosshead 151 and the crosshead movement speed detector that detects the movement speed of the crosshead 151 are not limited to the mold clamping motor encoder 161 and general ones are used. can. Further, the movable platen position detector that detects the position of the movable platen 120 and the movable platen moving speed detector that detects the moving speed of the movable platen 120 are not limited to the mold clamping motor encoder 161 and general ones are used. can.

In the boosting step, the mold clamping force 160 is further driven to further advance the crosshead 151 from the mold closing completion position to the mold clamping position to generate a mold clamping force.

In the mold clamping step, the mold clamping motor 160 is driven to maintain the position of the crosshead 151 at the mold clamping position. In the mold clamping step, the mold clamping force generated in the pressurizing step is maintained. In the mold clamping step, a cavity space 801 (see FIG. 2) is formed between the movable mold 820 and the fixed mold 810, 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.

The number of cavity spaces 801 may be one or plural. In the latter case, a plurality of molded products can be obtained at the same time. The insert material may be arranged in a part of the cavity space 801 and the molding material may be filled in the other part of the cavity space 801. A molded product in which the insert material and the molding material are integrated can be obtained.

In the depressurization step, the mold clamping motor 160 is driven to retract the crosshead 151 from the mold clamping position to the mold opening start position, whereby the movable platen 120 is retracted and the mold clamping force is reduced. The mold opening start position and the mold closing completion position may be the same position.

In the mold opening process, the movable platen 120 is retracted by driving the mold clamping motor 160 to retract the crosshead 151 from the mold opening start position to the mold opening completion position at a set moving speed, and the movable mold 820 is fixed. Separate from the mold 810. After that, the ejector device 200 projects the molded product from the movable mold 820.

The setting conditions in the mold closing step, the pressurizing step, and the mold clamping step are collectively set as a series of setting conditions. For example, the moving speed and position (including the mold closing start position, the moving speed switching position, the mold closing completion position, and the mold clamping position) and the mold clamping force of the cross head 151 in the mold closing step and the pressurizing step are set as a series of setting conditions. As, it is set collectively. The mold closing start position, the moving speed switching position, the mold closing completion position, and the mold closing position are arranged in this order from the rear side to the front side, and represent the start point and the end point of the section in which the movement speed is set. The movement speed is set for each section. The movement speed switching position may be one or a plurality. The moving speed switching position does not have to be set. Only one of the mold clamping position and the mold clamping force may be set.

The setting conditions in the depressurization step and the mold opening step are also set in the same manner. For example, the moving speed and position (mold opening start position, moving speed switching position, and mold opening completion position) of the crosshead 151 in the depressurization step and the mold opening step are collectively set as a series of setting conditions. The mold opening start position, the movement 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 the end point of the section in which the movement speed is set. The movement speed is set for each section. The movement speed switching position may be one or a plurality. The moving speed switching position does not have to be set. The mold opening start position and the mold closing completion position may be the same position. Further, the mold opening completion position and the mold closing start position may be the same position.

Instead of the moving speed and position of the crosshead 151, the moving speed and position of the movable platen 120 may be set. Further, the mold clamping force may be set instead of the position of the crosshead (for example, the 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 the toggle magnification. The toggle magnification changes according to the angle θ 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 is maximized.

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

The mold clamping device 100 has a mold thickness adjusting mechanism 180. The mold thickness adjusting mechanism 180 adjusts the mold thickness by adjusting the distance L between the fixed platen 110 and the toggle support 130. The timing of mold thickness adjustment is, for example, from the end of the molding cycle to the start of the next molding cycle. The mold thickness adjusting mechanism 180 is screwed into, for example, a screw shaft 181 formed at the rear end of the tie bar 140, a screw nut 182 that is rotatably and irreversibly held by a toggle support 130, and a screw shaft 181. It has a mold thickness adjusting motor 183 for rotating the screw nut 182.

The screw shaft 181 and the screw nut 182 are provided for each tie bar 140. The rotational driving force of the mold thickness adjusting motor 183 may be transmitted to a plurality of screw nuts 182 via the rotational driving force transmission unit 185. Multiple screw nuts 182 can be rotated synchronously. By changing the transmission path of the rotation driving force transmission unit 185, it is possible to rotate the plurality of screw nuts 182 individually.

The rotational driving force transmission unit 185 is composed of, for example, a gear or the like. In this case, a driven gear is formed on the outer circumference of each screw nut 182, a drive gear is attached to the output shaft of the mold thickness adjusting motor 183, and a plurality of driven gears and an intermediate gear that meshes with the drive gear are located at the center of the toggle support 130. It is held rotatably. The rotary driving force transmission unit 185 may be composed of a belt, a pulley, or the like instead of the gear.

The operation of the mold thickness adjusting mechanism 180 is controlled by the control device 700. The control device 700 drives the mold thickness adjusting motor 183 to rotate the screw nut 182. As a result, the position of the toggle support 130 with respect to the tie bar 140 is adjusted, and the distance L between the fixed platen 110 and the toggle support 130 is adjusted. A plurality of mold thickness adjusting mechanisms may be used in combination.

The interval L is detected by using the mold thickness adjusting motor encoder 184. The mold thickness adjusting motor encoder 184 detects the rotation amount and the rotation direction of the mold thickness adjusting motor 183, and sends a signal indicating the detection result to the control device 700. The detection result of the mold thickness 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 that detects the position of the toggle support 130 and the interval detector that detects the interval L are not limited to the mold thickness adjustment motor encoder 184, and general ones can be used.

The mold clamping device 100 may have a mold temperature controller that adjusts the temperature of the mold device 800. The mold device 800 has a flow path of the temperature control medium inside the mold device 800. The mold temperature controller adjusts the temperature of the mold device 800 by adjusting the temperature of the temperature control medium supplied to the flow path of the mold device 800.

The mold clamping device 100 of the present 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 vertical.

The mold clamping device 100 of the present embodiment has a mold clamping motor 160 as a drive source, but may have a hydraulic cylinder instead of the mold clamping motor 160. Further, the mold clamping device 100 may have a linear motor for opening and closing the mold 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 (for example, the positive direction of the X axis) is set forward, and the moving direction of the movable platen 120 when the mold is opened (for example). The X-axis negative direction) will be described as the rear.

The ejector device 200 is attached to the movable platen 120 and moves forward and backward together with the movable platen 120. The ejector device 200 includes an ejector rod 210 that projects a molded product from the mold device 800, and a drive mechanism 220 that moves the ejector rod 210 in the moving direction (X-axis direction) of the movable platen 120.

The ejector rod 210 is freely arranged in the through hole of the movable platen 120. The front end of the ejector rod 210 comes into contact with the ejector plate 826 of the movable mold 820. The front end of the ejector rod 210 may or may not be connected to the ejector plate 826.

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

The ejector device 200 performs the ejection process under the control of the control device 700. In the ejection step, the ejector rod 210 is advanced from the standby position to the ejection position at a set moving speed to advance the ejector plate 826 and eject the molded product. After that, the ejector motor is driven to retract the ejector rod 210 at the set moving speed, and the ejector plate 826 is retracted to the original standby position.

The position and moving speed of the ejector rod 210 are detected by using, for example, an ejector motor encoder. The ejector motor encoder detects the rotation of the ejector motor and sends a signal indicating the detection result to the control device 700. The ejector rod position detector for detecting the position of the ejector rod 210 and the ejector rod moving speed detector for detecting the moving speed of the ejector rod 210 are not limited to the ejector motor encoder, 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 at the time of filling (for example, the negative direction of the X axis) is set to the front, and the moving direction of the screw 330 at the time of weighing. (For example, the X-axis positive direction) will be described as the rear.

The injection device 300 is installed on the slide base 301, and the slide base 301 is freely arranged with respect to the injection device frame 920. The injection device 300 is freely arranged 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 rotates, for example, a cylinder 310 for heating a molding material, a nozzle 320 provided at the front end of the cylinder 310, a screw 330 rotatably arranged in the cylinder 310, and a screw 330. It has a metering motor 340 for moving the screw 330, an injection motor 350 for moving the screw 330 forward and backward, and a load detector 360 for detecting the load transmitted between the injection motor 350 and the screw 330.

The cylinder 310 heats the molding material supplied internally from the supply port 311. The molding material includes, for example, a resin. The molding material is formed, for example, in the form of pellets 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 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 in front of the cooler 312.

The cylinder 310 is divided into a plurality of zones in the axial direction (for example, the X-axis direction) of the cylinder 310. A heater 313 and a temperature detector 314 are provided in each of the plurality of zones. The control device 700 controls the heater 313 so that the set temperature is set in each of the plurality of zones and the detection temperature of the temperature detector 314 becomes the set temperature.

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

The screw 330 is rotatably and rotatably arranged in the cylinder 310. Rotation of the screw 330 causes the molding material to be fed forward along the spiral groove of the screw 330. The molding material is gradually melted by the heat from the cylinder 310 while being fed forward. As the liquid molding material is fed in front of the screw 330 and accumulated in the front of the cylinder 310, the screw 330 is retracted. After that, when the screw 330 is advanced, the liquid molding material accumulated in front of the screw 330 is ejected from the nozzle 320 and filled in the mold apparatus 800.

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

When the backflow prevention ring 331 is advanced, the backflow prevention ring 331 is pushed backward by the pressure of the molding material in front of the screw 330, and is relative to the screw 330 up to the closing 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 backflow prevention ring 331 is pushed forward by the pressure of the molding material sent forward along the spiral groove of the screw 330 when the screw 330 is rotated, and the opening position opens the flow path of the molding material. Advance relative to screw 330 to (see FIG. 1). This feeds the molding material in front of the screw 330.

The backflow prevention ring 331 may be either a co-rotating type that rotates with the screw 330 or a non-co-rotating type that does not rotate with the screw 330.

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

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.

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 for converting the rotational 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 to the screw shaft. A ball, a roller, 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.

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.

The load detector 360 sends a 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, the pressure received by the screw 330 from the molding material, the back pressure on the screw 330, and the pressure acting on the molding material from the screw 330. It is used for pressure control and monitoring.

The pressure detector that detects the pressure of the molding material is not limited to the load detector 360, and a general one can be used. For example, a nozzle pressure sensor or a mold internal pressure sensor may be used. The nozzle pressure sensor is installed in the nozzle 320. The mold internal pressure sensor is installed inside the mold device 800.

The injection device 300 performs a weighing step, a filling step, a pressure holding step, and the like under the control of the control device 700. The filling process and the pressure holding process may be collectively referred to as an injection process.

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

In the weighing process, the injection motor 350 may be driven to apply a set back pressure to the screw 330 in order to limit the sudden retreat of the screw 330. The back pressure on the screw 330 is detected using, for example, a load detector 360. When the screw 330 retracts to the weighing completion position and a predetermined amount of molding material is accumulated in front of the screw 330, the weighing process is completed.

The position and rotation speed of the screw 330 in the weighing process are collectively set as a series of setting conditions. For example, the weighing start position, the rotation speed switching position, and the weighing completion position are set. These positions are arranged in this order from the front side to the rear side, and represent the start point and the end point of the section in which the rotation speed is set. The rotation speed is set for each section. The rotation speed switching position may be one or a plurality. The rotation speed switching position does not have to be set. In addition, back pressure is set for each section.

In the filling step, the injection motor 350 is driven to advance the screw 330 at a set moving speed, and the liquid molding material accumulated in front of the screw 330 is filled in the cavity space 801 in the mold apparatus 800. The position and moving speed of the screw 330 are detected by using, for example, an injection motor encoder 351. The injection motor encoder 351 detects the 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 pressure holding process (so-called V / P switching) is performed. The position where V / P switching is performed is also called the V / P switching position. The set moving speed of the screw 330 may be changed according to the position and time of the screw 330.

The position and moving speed of the screw 330 in the filling step are collectively set as a series of setting conditions. For example, a filling start position (also referred to as an “injection start position”), a moving speed switching position, and a V / P switching position are set. These positions are arranged in this order from the rear side to the front side, and represent the start point and the end point of the section in which the movement speed is set. The movement speed is set for each section. The movement speed switching position may be one or a plurality. The moving speed switching position does not have to be set.

The upper limit of the pressure of the screw 330 is set for each section in which the moving speed of the screw 330 is set. The pressure of the screw 330 is detected by the load detector 360. If the pressure of the screw 330 is equal to or less than the set pressure, the screw 330 is advanced at the set moving speed. On the other hand, when the pressure of the screw 330 exceeds the set pressure, the screw 330 is advanced at a movement speed slower than the set movement speed so that the pressure of the screw 330 becomes equal to or less than the set pressure for the purpose of mold protection.

After the position of the screw 330 reaches the V / P switching position in the filling step, the screw 330 may be temporarily stopped at the V / P switching position, and then 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 at a slow speed. Further, the screw position detector that detects the position of the screw 330 and the screw movement speed detector that detects the movement speed of the screw 330 are not limited to the injection motor encoder 351 and general ones can be used.

In the pressure holding step, the injection motor 350 is driven to push the screw 330 forward, and the pressure of the molding material (hereinafter, also referred to as “holding pressure”) at the front end portion of the screw 330 is maintained at a set pressure in the cylinder 310. The remaining molding material is pushed toward the mold device 800. The shortage of molding material due to cooling shrinkage in the mold apparatus 800 can be replenished. The holding pressure is detected using, for example, a load detector 360. The set value of the holding pressure may be changed according to the elapsed time from the start of the holding pressure step and the like. A plurality of holding pressures and holding times for holding the holding pressure in the holding pressure step may be set respectively, and may be collectively set as a series of setting conditions.

In the pressure holding step, the molding material in the cavity space 801 in the mold apparatus 800 is gradually cooled, and when the pressure holding step is completed, the inlet of the cavity space 801 is closed with the solidified molding material. This state is called a gate seal, and the backflow of the molding material from the cavity space 801 is prevented. After the pressure holding step, the cooling step is started. In the cooling step, the molding material in the cavity space 801 is solidified. A weighing step may be performed during the cooling step for the purpose of shortening the molding cycle time.

The injection device 300 of the present embodiment is an in-line screw system, but may be a pre-plastic system or the like. The pre-plastic injection device supplies the molded material melted in the plasticized cylinder to the injection cylinder, and injects the molding material from the injection cylinder into the mold device. In the plasticized cylinder, the screw is rotatably and irreversibly arranged, or the screw is rotatably and rotatably arranged. On the other hand, a plunger is arranged in the injection cylinder so as to be able to move forward and backward.

Further, the injection device 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 in the vertical direction. The mold clamping device combined with the vertical injection device 300 may be 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 at the time of filling (for example, the negative direction of the X axis) is set to the front, and the moving direction of the screw 330 at the time of weighing (for example, the positive direction of the X axis). Will be described as backward.

The moving device 400 advances and retreats the injection device 300 with respect to the mold device 800. Further, the moving device 400 presses the nozzle 320 against the mold device 800 to generate a 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.

The hydraulic pump 410 has a first port 411 and a second port 412. The hydraulic pump 410 is a pump that can rotate in both directions, and by switching the rotation direction of the motor 420, the 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 the hydraulic fluid from the tank and discharge the hydraulic fluid from either the first port 411 or the second port 412.

The motor 420 operates the hydraulic pump 410. The motor 420 drives the hydraulic pump 410 in the rotational direction and rotational torque according to the control signal from the control device 700. The motor 420 may be an electric motor or 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 to the injection device 300. The piston 432 divides 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. The piston rod 433 is fixed to the fixed 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 anterior chamber 435 via the first flow path 401, so that the injection device 300 is pushed forward. The injection device 300 is advanced and the nozzle 320 is pressed against the fixed mold 810. The anterior chamber 435 functions as a pressure chamber that generates a 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 via the second flow path 402, so that the injection device 300 is pushed backward. The injection device 300 is retracted and the nozzle 320 is separated from the fixed mold 810.

In the present embodiment, the moving device 400 includes the 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 motor into 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. 1 to 2. The control device 700 performs various controls by causing the CPU 701 to execute the program stored in the storage medium 702. Further, the control device 700 receives a signal from the outside through the input interface 703 and transmits the signal to the outside through the output interface 704.

The control device 700 repeatedly performs a weighing process, a mold closing process, a pressure increasing process, a mold clamping process, a filling process, a pressure holding process, a cooling process, a depressurization process, a mold opening process, a protrusion process, and the like to produce a molded product. Manufacture repeatedly. A series of operations for obtaining a molded product, for example, an operation from the start of a weighing process to the start of the next weighing process is also referred to as a "shot" or a "molding cycle". Further, the time required for one shot is also referred to as "molding cycle time" or "cycle time".

A single molding cycle has, for example, a weighing step, a mold closing step, a pressurizing step, a mold clamping step, a filling step, a pressure holding step, a cooling step, a depressurizing step, a mold opening step, and an ejection step in this order. The order here is the order of starting each process. The filling, holding, and cooling steps are performed during the mold clamping step. The start of the mold clamping step may coincide with the start of the filling step. Completion of the depressurization process coincides with the start of the mold opening process.

In addition, a plurality of steps may be performed at the same time for the purpose of shortening the molding cycle time. For example, the weighing step may be performed during the cooling step of the previous molding cycle or during the mold clamping step. In this case, the mold closing step may be performed at the beginning of the molding cycle. Further, the filling step may be started during the mold closing step. Further, the ejection process may be started during the mold opening process. If an on-off valve that opens and closes the flow path of the nozzle 320 is provided, the mold opening step may be started during the weighing step. This is because even if the mold opening process is started during the weighing process, the molding material does not leak from the nozzle 320 if the on-off valve closes the flow path of the nozzle 320.

In addition, one molding cycle has processes other than the weighing process, the mold closing process, the pressurizing process, the mold clamping process, the filling process, the pressure holding process, the cooling process, the depressurizing process, the mold opening process, and the ejection process. You may.

For example, a pre-weighing suckback step may be performed in which the screw 330 is retracted to a preset weighing start position after the completion of the pressure holding step and before the start of the weighing step. The pressure of the molding material accumulated in front of the screw 330 before the start of the weighing process can be reduced, and the screw 330 can be prevented from suddenly retreating at the start of the weighing process.

Further, after the completion of the weighing step and before the start of the filling step, a post-weighing suckback step may be performed in which the screw 330 is retracted to a preset filling start position (also referred to as an “injection start position”). The pressure of the molding material accumulated in front of the screw 330 before the start of the filling process can be reduced, and the leakage of the molding material from the nozzle 320 before the start of the filling process can be prevented.

The control device 700 is connected to an operation device 750 that accepts an input operation by a user and a display device 760 that displays a screen. The operating device 750 and the display device 760 may be composed of, for example, a touch panel 770 and may be integrated. The touch panel 770 as the display device 760 displays a screen under the control of the control device 700. On the screen of the touch panel 770, for example, information such as the setting of the injection molding machine 1 and the current state of the injection molding machine 1 may be displayed. Further, on the screen of the touch panel 770, for example, an operation unit such as a button for accepting an input operation by a user or an input field may be displayed. The touch panel 770 as the operation device 750 detects an input operation on the screen by the user and outputs a signal corresponding to the input operation to the control device 700. As a result, for example, the user can operate the operation unit provided on the screen while checking the information displayed on the screen to set the injection molding machine 1 (including inputting the set value) and the like. can. Further, by the user operating the operation unit provided on the screen, the injection molding machine 1 corresponding to the operation unit can be operated. The operation of the injection molding machine 1 may be, for example, the operation (including stopping) of the mold clamping device 100, the ejector device 200, the injection device 300, the moving device 400, and the like. Further, the operation of the injection molding machine 1 may be switching of the screen displayed on the touch panel 770 as the display device 760 or the like.

Although the operation device 750 and the display device 760 of the present embodiment have been described as being integrated as the touch panel 770, they may be provided independently. Further, a plurality of operating devices 750 may be provided. The operating device 750 and the display device 760 are arranged on the operating side (Y-axis negative direction) of the mold clamping device 100 (more specifically, the fixed platen 110).

<Lubrication structure at the legs of the toggle support>
Next, the lubrication structure between the leg 131 of the toggle support 130 and the frame 900 will be described with reference to FIGS. 3 to 6. FIG. 3 is a perspective view of the toggle support 130 of the injection molding machine 1. FIG. 4 is a bottom view of the leg 131 of the toggle support 130. FIG. 5 is a sectional view taken along line AA of the leg 131 of the toggle support 130. FIG. 6 is a sectional view taken along line BB of the leg 131 of the toggle support 130 and the frame 900. In FIG. 6, the flow of the lubricant is shown by a solid line, and the flow of air is shown by a broken line.

As described above, the fixed platen 110 is fixed to the frame 900. The toggle support 130 is connected to the fixed platen 110 via a tie bar 140 arranged parallel to the mold opening / closing direction. Further, as shown in FIG. 3, the leg 131 of the toggle support 130 is movably mounted on the mounting surface 901 of the frame 900 in the mold opening / closing direction.

Here, when the mold clamping force is generated by the toggle mechanism 150, the tie bar 140 extends according to the mold clamping force, and the toggle support 130 moves backward. Further, when the mold clamping force by the toggle mechanism 150 is released, the elongation of the tie bar 140 is restored and the toggle support 130 advances. As a result, the leg 131 of the toggle support 130 moves forward and backward in the mold opening / closing direction (X direction) and slides on the mounting surface 901 of the frame 900. Further, the bottom surface of the leg 131 of the toggle support 130 and the mounting surface 901 of the frame 900 serve as sliding surfaces. The injection molding machine 1 has a lubrication structure for lubricating the sliding surfaces of the leg 131 of the toggle support 130 and the frame 900.

The leg 131 is mounted on the mounting surface 901 of the frame 900 and supports the toggle support main body 132. The leg portion 131 has a supply passage 10, a lubrication surface 20, a storage portion 30, a gap forming portion 40, and a suction passage 50.

The supply path 10 supplies the lubricant to the lubricating surface 20 formed on the bottom surface of the leg 131. A supply path connection port 11 is provided on the side surface of the leg 131 of the toggle support 130. A supply path 12 that communicates from the supply path connection port 11 to the bottom surface of the leg portion 131 (the concave groove portion 13 described later) is provided. A concave groove portion 13 extending in the longitudinal direction is provided on the bottom surface of the leg portion 131 of the toggle support 130.

The supply path connection port 11 is shown as being provided on one end surface of the leg portion 131 in the longitudinal direction (mold opening / closing direction), but the present invention is not limited to this, and the leg portion 131 is not limited to this, and the leg portion 131 is provided in the lateral direction (operation). It may be provided on one end surface (/ counter-operation direction).

The lubrication surface 20 is a surface that comes into contact with the mounting surface 901 of the frame 900, and is a surface that slides on the mounting surface 901 as the toggle support 130 moves forward and backward. A lubricant is supplied from the supply path 10 between the lubricating surface 20 of the leg portion 131 and the mounting surface 901.

The storage unit 30 stores the lubricant that lubricated the lubricating surface 20. As shown in FIG. 3, the accumulating portion 30 is formed as an annular groove portion surrounding the concave groove portion 13 and the lubricating surface 20.

The gap forming portion 40 is formed on the outer side of the accumulating portion 30. When the leg portion 131 is mounted on the frame 900, the gap forming portion 40 forms a slight gap with the mounting surface 901. In other words, the storage portion 30 is open from the end portion of the bottom surface of the leg portion 131, and is formed so that air can flow into the storage portion 30 from the outer space. Further, the outer bottom surface of the leg portion 131 is formed higher than the lubricating surface 20. Further, the outer bottom surface of the leg portion 131 is formed with a notch portion through which air flows from the outer space to the storage portion 30.

The suction path 50 sucks the lubricant accumulated in the storage unit 30. A suction path connection port 51 is provided on the side surface of the leg 131 of the toggle support 130. A suction path 52 that communicates from the suction path connection port 51 to the bottom surface (accumulation portion 30) of the leg portion 131 is provided.

The suction path connection port 51 is shown as being provided on one end surface of the leg portion 131 in the longitudinal direction (mold opening / closing direction), but the present invention is not limited to this, and the leg portion 131 is not limited to this, and the leg portion 131 is provided in the lateral direction (operation). It may be provided on one end surface (/ counter-operation direction). Further, a plurality of suction path connection ports 51 and suction paths 52 may be provided. For example, the suction passage 52 may be provided in both the longitudinal direction (mold opening / closing direction) of the leg portion 131. As a result, when the toggle support 130 moves forward and backward in the mold opening / closing direction, the lubricant that has flowed into the accumulating portion 30 from the lubricating surface can be suitably recovered.

The suction path connection port 51 is connected to the inflow port of the separator 61 via a pipe. The separator 61 separates the air sucked from the accumulator 30 from the lubricant. The gas side port of the separator 61 is connected to the suction pump (suction portion) 62. The liquid (lubricant) side port of the separator 61 is connected to the pump 63. The pump 63 supplies the lubricant separated by the separator 61 to the tank 64. The tank 64 stores the lubricant. The tank 64 may be configured to be housed together with a lubricant that lubricates other lubricating portions. A supply pump (supply unit) 65 is arranged between the tank 64 and the supply path connection port 11. The supply pump 65 supplies the lubricant to the supply path connection port 11. As a result, the pump 63, the tank 64, and the supply pump 65 form a circulation portion that supplies the lubricant sucked through the suction path 50 to the supply path 10.

Next, the flow of the lubricant will be described. The lubricant supplied from the supply path connection port 11 flows through the supply path 12 and is supplied to the concave groove portion 13 as shown by the solid line arrow in FIG. Then, the lubricant supplied to the concave groove portion 13 lubricates the lubricating surface 20 and the mounting surface 901 and flows to the accumulating portion 30, so that the leg portion 131 of the toggle support 130 and the frame 900 slide. Lubricate the surface.

The suction pump 62 is formed of, for example, a blower. Due to the operation of the suction pump 62, the inside of the storage unit 30 has a negative pressure compared to the outside space. Therefore, an air flow from the outer space toward the storage portion 30 (see the broken line arrow in FIG. 6) is generated in the gap between the gap forming portion 40 and the mounting surface 901, and a sealing member or the like is generated in the gap forming portion 40. It is possible to prevent the lubricant from flowing out to the outer space through the gap forming portion 40 without using the above.

Then, the air flowing from the outer space into the storage portion 30 through the gap forming portion 40 is discharged together with the lubricant from the suction path 52 and the suction path connection port 51. In this way, the suction pump 62 sucks the air from the outside and the lubricant of the storage portion 30 through the suction path 50.

The air and the lubricant discharged from the suction path connection port 51 are separated by the separator 61. The separated air is sucked by the suction pump 62 and discharged to the outside of the machine.

The pump 63 sucks the lubricant separated by the separator 61. The lubricant separated by the separator 61 passes through a filter (not shown), is sucked by the pump 63, and is stored in the tank 64. The pump 63 may be equipped with a filter. The pump 63 is not essential and may not be provided.

The supply pump 65 supplies the lubricant stored in the tank 64 to the supply path 10 from the supply path connection port 11.

As described above, according to the injection molding machine 1 according to the present embodiment, the lubricating surface 20 can be lubricated and the lubricant can be recovered, so that the lubricant can be prevented from dripping or scattering, and the injection molding machine 1 can be prevented. Cleanability and maintainability are improved. In addition, it is possible to prevent the scattered lubricant from adhering to the molded product. Further, since the lubricant can be recovered, the lubricant can be reused and the running cost can be reduced.

Although the embodiment of the injection molding machine 1 has been described above, the present invention is not limited to the above-described embodiment and the like, and various modifications are made within the scope of the gist of the present invention described in the claims. , Improvement is possible.

FIG. 7 is a perspective view of the toggle support 130 of the injection molding machine 1. As shown in FIG. 7, the wiper 71 may be provided in the mold opening / closing direction of the leg 131. The wiper 71 comes into contact with the mounting surface 901 and wipes off the lubricant adhering to the mounting surface 901. This makes it possible to prevent the mounting surface 901 wet with the lubricant from being exposed to the outside when the toggle support 130 moves forward and backward.

FIG. 8 is a perspective view of the toggle support 130 of the injection molding machine 1. As shown in FIG. 8, the cover 72 may be provided in the mold opening / closing direction of the leg 131. The cover 72 is formed so as to extend in the mold opening / closing direction along the mounting surface 901. This makes it possible to prevent the mounting surface 901 wet with the lubricant from being exposed to the outside when the toggle support 130 moves forward and backward.

1 Injection molding machine 10 Supply path 11 Supply path connection port 12 Supply path 13 Concave groove 20 Lubrication surface 30 Accumulation section 40 Gap forming section 50 Suction path 51 Suction path connection port 52 Suction path 61 Separator 62 Suction pump (suction section)
63 Pump (circulation section)
64 Tank (circulation part)
65 Supply pump (supply section, circulation section)
71 Wiper (leakage prevention part)
72 Cover (exposure prevention part)
100 Mold clamping device 110 Fixed platen 120 Movable platen 130 Toggle support 131 Leg 132 Toggle support body 140 Tie bar 150 Toggle mechanism 900 Frame 901 Mounting surface

Claims (14)

An injection molding machine equipped with a toggle support that is mounted on a frame and supports a toggle mechanism.
The toggle support is
With the support body
It has legs that are mounted on the mounting surface of the frame and support the support body.
The legs
A supply path in which the lubricant is supplied to the lubricating surface formed on the bottom surface,
A storage unit that stores the lubricant that lubricated the lubricated surface, and
It has a suction path into which the lubricant of the accumulated portion is sucked, and has.
The storage unit is communicated with the outside and is communicated with the outside.
Air from the outside and the lubricant of the storage portion are sucked into the suction path.
Injection molding machine. The storage portion is formed on the bottom surface of the leg portion so as to surround the supply path.
The injection molding machine according to claim 1. The accumulation portion has an annular groove portion.
The injection molding machine according to claim 1 or 2. The storage portion is open from the end of the bottom surface of the leg portion.
The injection molding machine according to any one of claims 1 to 3. The outer bottom surface of the accumulation portion is higher than the lubrication surface.
The injection molding machine according to any one of claims 1 to 4. The outer bottom surface of the storage portion has a notch.
The injection molding machine according to any one of claims 1 to 5. The supply path is formed from the side surface of the leg toward the bottom surface of the leg.
The injection molding machine according to any one of claims 1 to 6. The suction path is formed from the storage portion toward the side surface of the leg portion.
The injection molding machine according to any one of claims 1 to 7. A plurality of the suction paths are provided.
The injection molding machine according to any one of claims 1 to 8. It has a suction portion that sucks air from the outside and the lubricant of the storage portion through the suction path.
The injection molding machine according to any one of claims 1 to 9. It has a separator that separates the lubricant from the air and lubricant sucked through the suction path.
The injection molding machine according to any one of claims 1 to 10. It has a circulation part that supplies the lubricant sucked through the suction path to the supply path.
The injection molding machine according to any one of claims 1 to 11. The leg has a leak-preventing portion at the end of the lower surface to prevent the lubricant from leaking to the outside.
The injection molding machine according to any one of claims 1 to 12. The leg portion has an exposure prevention portion that prevents the lubrication surface from being exposed.
The injection molding machine according to any one of claims 1 to 13.

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