JP2022066388A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine capable of reducing a chance of collision of an ejector rod to a mold tool.

SOLUTION: An injection molding machine includes: an ejector rod for ejecting a molding out; a crosshead to which the ejector rod is attached; and a control unit configured to control a progress or a retreat of the ejector rod. The control unit includes: a storage part configured to store first information on the attachment of the ejector rod to the crosshead; an acquisition part configured to acquire second information on the attachment of the ejector rod to the crosshead; and a collation part configured to collate the first information stored in the storage part and the second information acquired at the acquisition part. The first information is provided at the mold tool device as identification information. The storage part stores the identification information read and sent by a reader.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to an injection molding machine.

The injection molding machine includes a mold clamping device and an injection device. The mold clamping device closes, molds and opens the mold, and the injection device applies holding pressure to the mold after injecting a liquid molding material into the cavity space formed in the mold. While solidifying. After the mold clamping device opens the mold, the ejector rod attached to the ejector device projects the movable member in the mold through the through hole of the mold. The cured resin solidified in the cavity space is pushed down from the mold by the movable member projected (advanced) by the ejector rod, and is recovered as a molded product.

The mold clamping device of an injection molding machine has a pair of platens for mounting a mold. As a method of attaching the mold to the platen, a method of fastening the mold to the platen with a bolt, or attaching a magnet clamp to the fixed surface of the platen and using the magnetic force of the magnet clamp to use the magnetic force of the magnet clamp to mount the main surface of the magnet clamp (mold mounting surface). ) Has a method of attaching a mold. In particular, when the mold is attached to the platen using a magnet clamp, the mold can be attached or detached by generating or erasing the magnetic force on the mold mounting surface of the magnet clamp, so that the mold can be easily replaced. Can be done.

When the mold is replaced, the place to be fixed to the platen of the mold generally changes depending on the structure of the mold. Therefore, when the mold is replaced, the mold must be accurately attached to the platen before using the injection molding machine.

Therefore, for example, in Patent Document 1, a bolt position-related information recognizing means for recognizing a bolt mounting position for each mounting object of an injection molding machine, a bolt mounting position recognized by the bolt position-related information recognizing means, or a bolt. An injection molding system having a bolt position storage means for storing the mounting position and the phase of the bolt has been proposed. In the injection molding system, the bolt attachment / detachment means attaches / detaches the bolt to / from the attached object based on the attachment position of the bolt stored in the bolt position storage means, or the attachment position of the bolt and the phase of the bolt.

Japanese Unexamined Patent Publication No. 2017-80929

However, Cited Document 1 does not describe confirming the mounting position of the ejector rod to be mounted on the ejector device and the number of required ejector rods. When the mold is replaced, the mounting position and number of ejector rods also differ because the mounting position of the ejector rod and the number of required ejector rods also depend on the structure of the mold.

In order to eject the molded product, the ejector rod transmits the power of ejection to the movable member in the mold through the through hole of the mold, so that the ejector rod is installed in the wrong position in the injection molding machine. When used with the ejector rod attached, the ejector rod may collide with the mold. In addition, the ejector rod may be deformed by colliding with the mold.

In particular, when the mold is fixed to the platen using a magnet clamp, when the ejector rod collides with the mold, the ejector rod may push out the mold and the mold may fall. Also, if the length of the ejector rod is different or the ejector rod attached to the crosshead is loosely attached, if the mold is attached to the injection molding machine and used, when the ejector rod collides with the movable member in the mold. The direction of the ejector rod may change due to the impact of. As a result, the ejector rod may collide with a through hole such as a mold, and the mold may fall.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an injection molding machine capable of reducing the collision of an ejector rod with a mold.

In order to solve the above problems, according to one aspect of the present invention,
An ejector rod for sticking out the molded product,
The crosshead to which the ejector rod is attached and
It has a control device for controlling the advance and retreat of the ejector rod, and has.
The control device is
A storage unit that stores the first information regarding the attachment of the ejector rod to the crosshead, and
An acquisition unit that acquires second information regarding the attachment of the ejector rod to the crosshead, and
A collation unit that collates the first information stored in the storage unit with the second information acquired by the acquisition unit, and
Have,
The first information is provided in the mold apparatus as identification information, and is provided.
The storage unit is provided with an injection molding machine that stores the identification information read and sent by the reader.

According to one aspect of the present invention, there is provided an injection molding machine capable of reducing the collision of the ejector rod with the mold.

It is a figure which shows the state at the time of completion of the mold opening of the injection molding machine by one Embodiment. It is a figure which shows the state at the time of mold clamping of the injection molding machine by one Embodiment. It is a figure which shows the state in the standby state of the ejector device by one Embodiment. It is a figure which shows the state at the time of sticking out the molded article of the ejector device by one Embodiment. It is a figure which shows the main surface of the movable platen side of a crosshead. It is a figure which shows the component of the control device by one Embodiment by the functional block. It is a figure which shows an example of the hole position information of the through hole of a movable mold. It is a figure which shows an example of the position of the through hole of a movable platen. It is a figure which shows an example of the position of the through hole of a magnet clamp. It is a flowchart explaining the method of confirming the attachment state of an ejector rod. It is a figure which shows an example of the state when the ejector rod attached to a crosshead through a through hole of a movable platen and a magnet clamp is seen from the movable mold side. It is a figure which shows another example of the state when the ejector rod attached to a crosshead through a through hole of a movable platen and a magnet clamp is seen from the movable mold side. It is a partially enlarged sectional view which shows an example of the ejector rod in the state which a pressure sensor is attached. It is a figure seen from the I-I direction in FIG. It is a side view which shows an example of the ejector device equipped with a camera. It is a side view which shows an example of the ejector apparatus which attached the laser irradiation apparatus.

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

(Injection molding machine)
FIG. 1 is a diagram showing a state at the time of completion of mold opening of an injection molding machine according to an embodiment. FIG. 2 is a diagram showing a state at the time of mold clamping of the injection molding machine according to the embodiment. In FIGS. 1 and 2, the X, Y, and Z directions are perpendicular to each other. The X and Y directions represent the horizontal direction, and the Z direction represents the vertical direction. When the mold clamping device 100 is 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 includes 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. Hereinafter, each component of the injection molding machine 10 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 (right direction in FIGS. 1 and 2) is the front, and the moving direction of the movable platen 120 when the mold is opened (left in the middle of FIGS. 1 and 2). Direction) will be described as backward.

The mold clamping device 100 closes, molds, and opens the mold of the mold device 800. 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, a movable platen 120, a toggle support 130, a tie bar 140, a toggle mechanism 150, a mold clamping motor 160, a motion conversion mechanism 170, and a mold thickness adjusting mechanism 180.

The fixed platen 110 is fixed to the frame 900. The fixed mold 810 is attached to the surface of the fixed platen 110 facing the movable platen 120.

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

By advancing and retreating the movable platen 120 with respect to the fixed platen 110, mold closing, mold clamping, and mold opening are performed. The mold device 800 is composed of the fixed mold 810 and the movable mold 820.

The toggle support 130 is connected to the fixed platen 110 at intervals and is movably mounted on the frame 900 in the mold opening / closing direction. The toggle support 130 may be movable along a guide laid on the frame 900. 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 frame 900 and the toggle support 130 is movable in the mold opening / closing direction with respect to the frame 900, but the toggle support 130 is fixed to the frame 900 and the fixed platen. The 110 may be movable in the mold opening / closing direction with respect to the frame 900.

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. 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 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 disposed 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 is composed of a crosshead 151, a pair of links, and the like. Each link group 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, and 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 retracting the crosshead 151 with respect to the toggle support 130, and advances and retracts 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 171 and a screw nut 172 screwed onto the screw shaft 171. A ball or roller may be interposed between the screw shaft 171 and the screw nut 172.

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

In the mold closing step, 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 a set speed, and the movable mold 820 is touched with the fixed mold 810. The position and 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 speed detector that detects 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 step, the mold clamping force is generated by further driving the mold clamping motor 160 to further advance the crosshead 151 from the mold closing completion position to the mold clamping position. At the time of mold clamping, 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 plural, in which case a plurality of molded articles can be obtained at the same time.

In the mold opening step, the movable platen 120 is retracted and the movable mold 820 is separated from the fixed mold 810 by driving the mold clamping motor 160 to retract the crosshead 151 to the mold opening completion position at a set speed. After that, the ejector device 200 projects 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 (including the mold closing start position, speed switching position, mold closing completion position, and mold clamping position) and the mold clamping force in the mold closing process and the mold clamping process are set as a series of setting conditions. , Set together. The mold closing start position, speed switching position, mold closing completion position, and 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 speed is set. The speed is set for each section. The speed switching position may be one or a plurality. The 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 mold opening process are also set in the same manner. For example, the speed and position (including the mold opening start position, the speed switching position, and the mold opening completion position) of the crosshead 151 in the mold opening process are collectively set as a series of setting conditions. The mold opening start position, speed switching position, and 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 speed is set. The speed is set for each section. The speed switching position may be one or a plurality. The speed switching position does not have to be set. The mold opening start position and the mold clamping 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 speed and position of the crosshead 151, the 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 that adjusts the mold thickness by adjusting the distance L between the fixed platen 110 and the toggle support 130. The mold thickness adjusting mechanism 180 rotates a screw shaft 181 formed at the rear end of the tie bar 140, a screw nut 182 rotatably held by the toggle support 130, and a screw nut 182 screwed to the screw shaft 181. It has a mold thickness adjusting motor 183.

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

The rotation transmission unit 185 is composed of, for example, a gear or the like. In this case, a passive 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 passive 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 rotation 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, thereby adjusting the position of the toggle support 130 that holds the screw nut 182 rotatably with respect to the fixed platen 110, and the fixed platen 110. Adjust the distance L from the toggle support 130.

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

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

Further, the screw nut 182 may be fixed to the toggle support 130, and the tie bar 140 may be rotatably held to the fixed platen 110. In this case, the interval L can be adjusted by rotating the tie bar 140.

Furthermore, the screw nut 182 may be fixed to the fixed platen 110 and the tie bar 140 may be rotatably held 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 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 thickness adjusting mechanism 180 adjusts the interval L by rotating one of the screw shaft 181 and the screw nut 182 that are screwed together. A plurality of mold thickness adjusting mechanisms 180 may be used, or a plurality of mold thickness adjusting motors 183 may be used.

The mold thickness adjusting mechanism 180 of the present embodiment has a screw shaft 181 formed on the tie bar 140 and a screw nut 182 screwed to the screw shaft 181 in order to adjust the spacing L. Not limited to.

For example, the mold thickness adjusting mechanism 180 may have a tie bar temperature controller that adjusts the temperature of the tie bar 140. The tie bar temperature controller is attached to each tie bar 140 and adjusts the temperature of a plurality of tie bars 140 in cooperation with each other. The higher the temperature of the tie bar 140, the longer the tie bar 140 is due to thermal expansion, and the larger the interval L is. The temperature of the plurality of tie bars 140 can 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 controller includes a cooler such as a water-cooled jacket, and the temperature of the tie bar 140 may be adjusted by cooling. The tie bar temperature controller may include both a heater and a cooler.

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 vertical mold clamping device includes a lower platen, an upper platen, a toggle support, a tie bar, 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 one is used 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 a lower mold and an upper mold. The lower mold may be attached to the lower platen via a rotary table. The toggle support is located below the lower platen and is connected to the upper platen via a tie bar. The tie bar connects the upper platen and the toggle support at intervals in the mold opening / closing direction. The toggle mechanism is disposed between the toggle support and the lower platen to raise and lower the movable platen. The mold clamping motor operates the toggle mechanism. When the mold clamping device is vertical, the number of tie bars is usually three. The number of tie bars is not particularly limited.

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 (right direction in FIGS. 1 and 2) is set to the front, and the movement of the movable platen 120 when the mold is opened. The direction (left direction in FIGS. 1 and 2) will be described as the rear.

The ejector device 200 projects a molded product from the mold device 800. The ejector device 200 includes an ejector motor 210, a motion conversion mechanism 220, an ejector rod 230, and the like.

The ejector motor 210 is attached to the movable platen 120. Although the details will be described later, the ejector motor 210 is connected to the motion conversion mechanism 220 via a belt, a pulley, or the like.

The motion conversion mechanism 220 converts the rotational motion of the ejector motor 210 into a linear motion of the ejector rod 230. The motion conversion mechanism 220 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 rod 230 is free to move forward and backward in the through hole of the movable platen 120. The front end portion of the ejector rod 230 comes into contact with the movable member 830 which is movably arranged inside the movable mold 820. The front end portion of the ejector rod 230 may or may not be connected to the movable member 830.

The ejector device 200 performs the ejection process under the control of the control device 700.

In the ejection step, the ejector motor 210 is driven to advance the ejector rod 230 from the standby position to the ejection position at a set speed, whereby the movable member 830 is advanced and the molded product is ejected. After that, the ejector motor 210 is driven to retract the ejector rod 230 at a 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 by using, for example, the ejector motor encoder 211. The ejector motor encoder 211 detects the rotation of the ejector motor 210, and sends a signal indicating the detection result to the control device 700. The ejector rod position detector that detects the position of the ejector rod 230 and the ejector rod speed detector that detects 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 (left direction in FIGS. 1 and 2) is set to the front, and the screw 330 during weighing is set forward. The moving direction of (the right direction in FIGS. 1 and 2) will be described as the rear.

The injection device 300 is installed on a slide base 301 that can be moved forward and backward with respect to the frame 900, and can be moved forward and backward 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 includes, for example, a cylinder 310, a nozzle 320, a screw 330, a measuring motor 340, an injection motor 350, a pressure detector 360, and the like.

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 of the cylinder 310 (left-right direction in FIGS. 1 and 2). A heater 313 and a temperature detector 314 are provided in each zone. The control device 700 controls the heater 313 so that the detection temperature of the temperature detector 314 becomes the set temperature for each zone.

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

The pressure detector 360 sends a signal indicating the detection result to the control device 700. The detection result of the pressure detector 360 is used for controlling and monitoring the pressure received by the screw 330 from the molding material, the back pressure on the screw 330, the pressure acting on the molding material from the screw 330, and the like.

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.

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 pressure detector 360. The pressure detector 360 sends a signal indicating the detection result to the control device 700. 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.

In the filling step, 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 in the cavity space 801 in the mold apparatus 800. The position and speed of the screw 330 are detected 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 speed of the screw 330 may be changed according to the position and time of the screw 330.

After the position of the screw 330 reaches the set position in the filling step, the screw 330 may be temporarily stopped at the set 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 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 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 pressure detector 360. The pressure detector 360 sends a signal indicating the detection result to the control device 700. 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.

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 prevents backflow of the molding material from the cavity space 801. 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 to reduce 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. A screw is rotatably or rotatably and rotatably arranged in the plastic cylinder, and a plunger is rotatably arranged in the injection cylinder.

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 (left direction in FIGS. 1 and 2) is set to the front, and the moving direction of the screw 330 at the time of weighing (FIGS. 1 and 2). (To the right in FIG. 2) will be described as the rear.

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 manufactures a molded product by repeatedly performing a mold closing step, a mold clamping step, a mold opening step, and the like. Further, the control device 700 performs a weighing step, a filling step, a pressure holding step, and the like during the mold clamping step. 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".

A single molding cycle has, for example, a weighing step, a mold closing step, a molding step, a filling step, a pressure holding step, a cooling step, a mold opening step, and a protrusion step in this order. The order here is the order of starting each process. The filling step, the pressure holding step, and the cooling step are performed from the start of the mold clamping step to the end of the mold clamping step. The end of the mold clamping 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 weighing step may be performed during the cooling step of the previous molding cycle, in which 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.

The control device 700 is connected to the operation device 750 and the display device 760. The operation device 750 receives an input operation by the user and outputs a signal corresponding to the input operation to the control device 700. The display device 760 displays an operation screen corresponding to an input operation in 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. Multiple operation screens are prepared, and they can be switched and displayed or displayed in layers. The user sets the injection molding machine 10 (including input of a set value) by operating the operation device 750 while looking at the operation screen displayed on the display device 760.

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

(Details of ejector device)
FIG. 3 is a diagram showing a standby state of the ejector device according to the embodiment. FIG. 4 is a diagram showing a state of the ejector device when the molded product is projected according to the embodiment.

The ejector device 200 is attached to the movable platen 120. The movable platen 120 has a movable platen main body portion 121 to which the movable mold 820 is attached, and a movable platen link attaching portion 125 to which the pin of the first link 152 is attached. The movable platen main body portion 121 and the movable platen link mounting portion 125 may be integrally formed by casting or the like.

The movable platen main body portion 121 has a plate-shaped portion formed in a substantially rectangular shape when viewed in the opening / closing direction of the mold. Notches may be formed along the tie bar 140 at the four corners of the plate. Instead of the notch, a through hole through which the tie bar 140 is inserted may be formed. The plate-shaped portion has a plurality of through holes 122 through which the ejector rod 230 is inserted. The number and arrangement of the through holes 122 provided in the movable platen 120 are determined by standards such as JIS (Japanese Industrial Standards). The number and arrangement of the through holes 122 vary depending on the size of the movable platen 120 and the like.

In addition to the plate-shaped portion, the movable platen main body portion 121 may further have a cylindrical portion that protrudes rearward from the outer peripheral edge portion of the plate-shaped portion. The tubular portion is formed in a square frame shape in the direction of opening and closing the mold, and forms a space inside for accommodating at least a part of the ejector device 200.

The movable platen link mounting portion 125 is provided on, for example, a pair of upper and lower surfaces (rear surface) facing the toggle support 130 in the movable platen main body portion 121. A through hole is formed at the tip of each movable platen link mounting portion 125, and a pin is inserted through the through hole so that the first link 152 can swing freely to the movable platen link mounting portion 125 via the pin. Can be installed.

As shown in FIGS. 3 and 4, the ejector device 200 includes, for example, an ejector motor 210, a motion conversion mechanism 220, an ejector rod 230, a crosshead 240, a magnet clamp 250, and a proximity sensor 260 which is a detection unit.

The ejector motor 210 is fixed to the movable platen 120. The rotational motion of the ejector motor 210 is transmitted to the motion conversion mechanism 220 via the belt or pulley, but may be directly transmitted to the motion conversion mechanism 220.

The motion conversion mechanism 220 converts the rotational motion of the ejector motor 210 into a linear motion of the crosshead 240. The linear motion of the crosshead 240 is transmitted to the ejector rod 230.

The motion conversion mechanism 220 has a screw shaft 221 and a screw nut 222 screwed onto the screw shaft 221. A ball or roller may be interposed between the screw shaft 221 and the screw nut 222. The screw shaft 221 penetrates the mounting plate 223 provided behind the movable platen main body 121 at a predetermined distance from the movable platen main body 121, and is fixed to the crosshead 240 at the front end portion. On the other hand, the screw nut 222 is held rotatably and immovably by the mounting plate 223.

When the ejector motor 210 is driven to rotate the screw nut 222, the screw shaft 221 and the crosshead 240 move forward and backward. The arrangement of the screw shaft 221 and the screw nut 222 is not particularly limited. For example, the screw shaft 221 may be held rotatably and immovably on the mounting plate 223, and the screw nut 222 may be fixed to the crosshead 240. In this case, when the ejector motor 210 is driven to rotate the screw shaft 221, the screw nut 222 and the crosshead 240 move forward and backward.

The crosshead 240 is free to move forward and backward along a guide rod 241 bridged between the mounting plate 223 and the movable platen main body 121. A plurality of guide rods 241 may be provided in order to prevent the crosshead 240 from rotating. The guide rod 241 may be cantilevered and supported by either the mounting plate 223 or the movable platen main body 121.

The ejector rod 230 is attached to the attachment portion 240a provided on the main surface of the crosshead 240 on the movable platen main body portion 121 side. A screw hole is formed in the mounting portion 240a, and the rear end portion of the ejector rod 230 serves as a screw shaft. The ejector rod 230 is attached by screwing the rear end portion to the attachment portion 240a. The ejector rod 230 is allowed to move forward and backward in a through hole 122 that penetrates the movable platen 120 (more specifically, the movable platen main body 121) in the front-rear direction, and is moved forward and backward as the crosshead 240 moves forward and backward. The number of ejector rods 230 is two in FIGS. 3 and 4, but may be one or three or more.

The front end portion of the ejector rod 230 passes through the through hole 820a of the movable mold 820 and comes into contact with the movable member 830 which is movably arranged inside the movable mold 820. The front end portion of the ejector rod 230 is not connected to the movable member 830, but may be connected to the movable member 830. When the front end portion of the ejector rod 230 is connected to the movable member 830, the spring 840 may be omitted.

The axial direction of the ejector rod 230 and the axial direction of the hole axis of the through hole 820a are the X-axis directions (left-right directions in FIGS. 1 to 4). The hole axis of the through hole 820a is substantially on the same straight line as the straight line extending in the axial direction of the ejector rod 230. The same straight line is not limited to the fact that the hole axis of the through hole 820a is exactly the same straight line as the straight line extending in the axial direction of the ejector rod 230, and a deviation of about an error is allowed.

When the ejector motor 210 is driven to advance the ejector rod 230, the movable member 830 advances and the molded product is projected from the movable mold 820.

The magnet clamp 250 is a plate-shaped member, and is provided on the main surface of the movable platen main body 121 on the fixed platen 110 side. The magnet clamp 250 has a plurality of magnets inside the magnet clamp 250 that generate a magnetic force for mounting the movable mold 820 on a main surface (mold mounting surface) for mounting the movable mold 820. As the magnet, an electromagnet or the like is used. The magnet clamp 250 can generate a magnetic force on the mold mounting surface or eliminate the magnetic force by supplying an electric current from an external power source to the magnet in the magnet clamp 250 when the movable mold 820 is mounted and released. By generating or erasing the magnetic force, the magnet clamp 250 can mount the movable mold 820 on the mold mounting surface and release the fixing.

The magnet clamp 250 has a through hole 250a on the same straight line as the hole axis of the through hole 122 of the movable platen 120. The number and arrangement of through holes 250a are similar to the number and arrangement of through holes 122.

The proximity sensor 260 is provided on the main surface of the crosshead 240 on the movable platen main body 121 side. As shown in FIG. 5, the proximity sensor 260 is provided in the vicinity of the mounting portion 240a of the ejector rod 230. The proximity sensor 260 is provided on the main surface of the crosshead 240 on the movable platen 120 side so that the proximity sensor 260 does not come into contact with the ejector rod 230 when the ejector rod 230 is attached to the attachment portion 240a.

When the ejector rod 230 is attached to the attachment portion 240a, the proximity sensor 260 detects the ejector rod 230 and transmits a detection signal to the control device 700. By providing the proximity sensor 260 in the vicinity of each mounting portion 240a, it is possible to confirm whether or not the ejector rod 230 is mounted on each mounting portion 240a. Thereby, the position where the ejector rod 230 is attached to the crosshead 240 can be detected. The detection signal is not limited to the case where the ejector rod 230 is detected, and may be transmitted to the control device 700 when the ejector rod 230 is not attached to the attachment portion 240a. The control device 700 can confirm that the ejector rod 230 is not attached by receiving the detection signal from the attachment portion 240a to which the ejector rod 230 is not attached. Therefore, the control device 700 can detect the position where the ejector rod 230 is attached to the crosshead 240.

As the proximity sensor 260, various types such as an optical sensor or a magnetic sensor can be adopted.

Instead of the non-contact type proximity sensor 260, a contact type switch may be used.

The mold device 800 has a fixed mold 810 attached to the fixed platen 110 and a movable mold 820 attached to the movable platen 120. As shown in FIG. 3, a cavity space 801 is formed between the fixed mold 810 and the movable mold 820 at the time of mold clamping. The molding material 2 reaches the cavity space 801 via the sprue 811 formed on the fixed mold 810, the runner 812 branched at the end of the sprue 811, and the gate 813 provided at the end of the runner 812.

The mold device 800 has a movable member 830 that is freely arranged inside the movable mold 820. As shown in FIG. 3, the movable member 830 has a plate-shaped ejector plate 831 perpendicular to the front-rear direction and a rod-shaped ejector pin 832 extending forward from the ejector plate 831.

The ejector plate 831 is pushed forward by the ejector rod 230 arranged behind the ejector plate 831. Further, the ejector plate 831 is pushed backward by the spring 840 arranged in front of the ejector plate 831.

The ejector pin 832 extends forward from the ejector plate 831 and penetrates the movable mold 820. As shown in FIG. 3, the molding material 2 flowing through the runner 812 is attached to and solidified at the front end portion of the ejector pin 832. The ejector pin 832 is used for projecting the molding material 2 solidified by the runner 812.

The control device 700 controls the advance / retreat of the ejector rod. After opening the mold device 800, the control device 700 advances the ejector rod 230 to the protruding position shown in FIG. As a result, the movable member 830 is advanced, and the molded product is projected from the movable mold 820. After that, the control device 700 retracts the ejector rod 230 from the through hole 820a of the movable mold 820 and the through hole 250a of the magnet clamp 250. Then, the control device 700 retracts the ejector rod 230 until the front end portion of the ejector rod 230 is located behind the front surface of the movable platen main body portion 121. As a result, the ejector rod 230 retracts to the standby position shown in FIG.

When the ejector rod 230 is advanced to the protruding position shown in FIG. 4, the ejector rod 230 protrudes forward from the front surface of the movable platen main body 121 and is inserted into the through hole 250a of the magnet clamp 250 and the through hole 820a of the movable mold 820. Will be done. The front end of the ejector rod 230 inserted into the through hole 820a hits the ejector plate 831 and advances the ejector pin 832.

FIG. 6 is a diagram showing components of a control device according to an embodiment as functional blocks. Each functional block shown in FIG. 6 is conceptual and does not necessarily have to be physically configured as shown. All or part of each functional block can be functionally or physically distributed / integrated in any unit. Each processing function performed in each function block may be realized by a program executed by a CPU in whole or in an arbitrary part, or may be realized as hardware by wired logic.

The control device 700 includes a storage unit 711, an acquisition unit 712, a collation unit 713, and a stop unit 714, and can control the advance and retreat of the ejector rod 230.

The storage unit 711 stores information regarding the attachment of the ejector rod 230 to the crosshead 240. The information includes mold information such as hole position information 711A for each mold device 800 and the length of the ejector rod 230.

The mold information can be recognized, for example, by reading identification information such as a two-dimensional code attached to the outside of the mold device 800 with a reader and sending it to the control device 700.

The hole position information 711A includes information defining the position of the through hole 820a of the movable mold 820 when the movable mold 820 is attached to the movable platen 12.

FIG. 7 shows an example of the hole position information of the through hole 820a of the movable mold 820 stored in the hole position information 711A. As shown in FIG. 7, the positions of the through holes 820a of the movable mold 820 are recorded as H1 and H2 in the hole position information 711A.

The acquisition unit 712 acquires information regarding the attachment of the ejector rod 230 to the crosshead 240. The information includes mounting information including mounting position information of the ejector rod 230. The mounting information includes information on the length of the ejector rod 230 and the like in addition to the mounting position information of the ejector rod 230. The mounting position information is information regarding the mounting position of the ejector rod 230 mounted on the mounting portion 240a, and in the present embodiment, the mounting position information can be acquired from the detection signal of the proximity sensor 260. The acquisition unit 712 acquires the detection signal transmitted from the proximity sensor 260 as the mounting position information of the ejector rod 230.

The collation unit 713 collates the information stored in the storage unit 711 with the information acquired by the acquisition unit 712. In the present embodiment, the collation unit 713 has information on the position where the ejector rod 230 is attached (hole position information 711A) stored in the storage unit 711, and the information on the attachment position of the ejector rod 230 acquired by the acquisition unit 712. It is collated with the mounting information including the information (mounting position information of the ejector rod 230). The position where the ejector rod 230 is attached is a first attachment portion arranged at a position on the same straight line as the hole axis of the through hole 820a of the movable mold 820 whose position is defined by the hole position information 711A. In the present embodiment, the collating portion 713 is based on the hole position information 711A and the mounting position information, and the ejector rod 230 is attached to the first mounting portion of the mounting portion 240a of the crosshead 240 where the ejector rod 230 is mounted. Make sure that is installed.

Further, the collating unit 713 collates the information of the position where the ejector rod 230 is not attached stored in the storage unit 711 with the information of the mounting position of the ejector rod 230 acquired by the acquiring unit 712. The position where the ejector rod 230 cannot be attached is a second attachment portion arranged at a position deviated from the straight line of the hole axis of the through hole 820a of the movable mold 820 whose position is defined by the hole position information 711A. In the present embodiment, the collating unit 713 confirms that the ejector rod 230 is not attached to the second attachment portion of the attachment portion 240a of the crosshead 240, which is a position where the ejector rod 230 cannot be attached.

Since the first mounting portion is arranged on the same straight line as the hole axis of the through hole 820a of the crosshead 240, the ejector rod 230 should be mounted in the mounting portion 240a of the crosshead 240. ..

Since the second mounting portion is arranged at a position deviated from the straight line of the hole axis of the through hole 820a of the crosshead 240, the position of the mounting portion 240a of the crosshead 240 where the ejector rod 230 should not be mounted. It is in.

The ejector rod 230 is passed through a through hole in which the hole axis of each of the through hole 122 of the movable platen 120 and the through hole 250a of the magnet clamp 250 is arranged on the same straight line as the first mounting portion or the second mounting portion. , Is mounted on the mounting portion 240a of the crosshead 240.

The number and arrangement of the through holes 122 of the movable platen 120 are determined by standards such as JIS. The number and arrangement of the through holes 250a of the magnet clamp 250 are the same as the number and arrangement of the through holes 122, and the through holes 250a are arranged in the magnet clamp 250 on the same straight line as the hole axis of the through holes 122. The through hole 122 and the through hole 250a are aligned with the mounting portion 240a of the crosshead 240 in the axial direction of the ejector rod 230. On the other hand, the through hole 820a of the movable mold 820 is on the same straight line as the hole axis of the through hole 122 and the through hole 250a, but the number of the through holes 820a is smaller than the number of the through holes 122 and the through holes 250a.

Therefore, the mounting portion 240a of the crosshead 240 is located at a position to be mounted on the straight line of the hole axis of the through hole 820a of the movable mold 820 and at a position deviated from the straight line of the hole axis of the through hole 820a. It will be in a position that should not be installed. The position to be mounted is the position of the first mounting portion, and the position not to be mounted is the position of the second mounting portion.

An example of the position of the through hole 122 of the movable platen 120 is shown in FIG. 8, and an example of the position of the through hole 250a of the magnet clamp 250 is shown in FIG. As shown in FIG. 8, the through holes 122 of the movable platen 120 are provided at the positions of PH1 to PH5, and as shown in FIG. 9, the through holes 250a of the magnet clamp 250 are provided at the positions of PM1 to PM5. Suppose you are. It is assumed that the through hole 820a of the movable mold 820 whose position is defined by the hole position information 711A is the position of H1 and H2 shown in FIG. 7. At this time, the through holes 122 of the movable platen 120 arranged on the same straight line as the hole axes of the through holes 820a at the positions of H1 and H2 become PH1 and PH3, and the through holes 250a of the magnet clamp 250 are PM1 and It becomes PM3.

Therefore, when the ejector rod 230 is attached to the crosshead 240 through the through hole 122 at the positions of PH1 and PH3 and the through hole 250a at the positions of PM1 and PM3, the ejector rod 230 is attached to the first attachment portion. It will be. On the other hand, when the ejector rod 230 is attached to the crosshead 240 through the through holes 122 at the positions of PH2, PH4, and PH5 and the through holes 250a at the positions of PM2, PM4, and PM5, the ejector rod 230 is attached to the crosshead 240. 2 It will be mounted on the mounting part.

The state of the ejector rod 230 when viewed from the movable mold 820 in the forward / backward direction of the ejector rod 230 can be displayed on the display device 760. When it is determined that the ejector rods 230 are attached to all the first attachment portions of the attachment portions 240a, the control device 700 may display an OK mark on the screen of the display device 760. When the control device 700 determines that the ejector rod 230 is attached to any of the second attachment portions of the attachment portions 240a, the control device 700 displays an NG mark on the screen of the display device 760 or makes a sound. The worker may be notified by generating it.

When the collating portion 713 determines that the ejector rod 230 is installed in the second mounting portion, the stop portion 714 penetrates the ejector rod 230 through the through hole 122 of the movable platen 120 and the through hole 250a of the magnet clamp 250. Keep it in the same state. Then, the ejector rod 230 has a function of pushing the front end portion forward of the movable platen main body portion 121 and stopping the ejector rod 230 so as not to move backward. Since the ejector rod 230 is stopped so that the front end portion of the ejector rod 230 protrudes forward from the movable platen main body portion 121 and does not move rearward, the ejector rod 230 can be removed by turning the ejector rod 230. Therefore, when the ejector rod 230 is attached to the second attachment portion of the attachment portions 240a of the crosshead 240, the attachment position of the ejector rod 230 can be changed from the second attachment portion to the first attachment portion.

(How to check the mounting status of the ejector rod 230)
Next, when the mold device 800 attached to the injection molding machine 10 is replaced by using the injection molding machine 10, the ejector rod 230 is attached when the ejector rod 230 attached to the crosshead 240 is replaced. A method for confirming the state will be described with reference to FIG. FIG. 10 is a flowchart illustrating a method of confirming the mounting state of the ejector rod 230. In the description of FIG. 10, the mold device 800 that is already attached to the mold clamping device 100 of the injection molding machine 10 and is removed is referred to as a previous mold device, and is a mold newly attached to the mold clamping device 100. The device 800 is referred to as the following mold device.

When the previous mold device 800 is removed from the mold clamping device 100 and the next mold device 800 is attached, first, the front mold device 800 is removed. Then, with the front mold device 800 removed, the ejector motor 210 is driven to advance the crosshead 240 (step S11). The ejector rod 230 already attached to the crosshead 240 passes through the through hole 122 of the movable platen main body 121 and the through hole 250a of the magnet clamp 250, and projects forward from the through hole 250a of the magnet clamp 250. The front mold device 800 has already been removed, and the front end of the ejector rod 230 projects forward of the movable platen body 121. Therefore, the ejector rod 230 attached to the crosshead 240 can be manually removed from the attachment portion 240a by a worker and taken out from the crosshead 240.

Subsequently, the control device 700 acquires the mold conditions of the next mold device 800, and acquires the hole position information 711A from the obtained mold conditions (step S12). The mold condition is acquired by the control device 700 by reading identification information such as a two-dimensional code attached to the outside of the next mold device 800 with a reader and transmitting the identification information to the control device 700.

Subsequently, the ejector rod 230 attached to the attachment portion 240a of the ejector rod 230 provided on the main surface of the advanced crosshead 240 on the movable platen main body 121 side is removed. Then, among the mounting portions 240a, the rear end portion of the ejector rod 230 is screwed into the mounting portion 240a at the position corresponding to the through hole 820a of the movable mold 820 of the next mold device 800, and the mounting portion 240a is formed. The position of the ejector rod 230 to be attached to is changed (step S13).

Subsequently, the control device 700 acquires the mounting information including the mounting position information of the ejector rod 230. As described above, the mounting information includes mounting position information of the ejector rod 230, information regarding the length of the ejector rod 230, and the like. The mounting position information is information regarding the mounting position of the ejector rod 230 mounted on the mounting portion 240a. In the present embodiment, the control device 700 receives the detection signal transmitted from the proximity sensor 260 installed in the vicinity of the mounting portion 240a of the crosshead 240. The control device 700 acquires the mounting position information of the ejector rod 230 based on the detection signal transmitted from the proximity sensor 260 (step S14).

Subsequently, the control device 700 collates the hole position information 711A with the mounting information of the ejector rod 230 acquired by the acquisition unit 712 (step S15). The control device 700 verifies whether all the ejector rods 230 attached to the crosshead 240 are attached to the first attachment portion or the second attachment portion of the crosshead 240.

As described above, the number and arrangement of the through holes 122 of the movable platen 120 and the through holes 250a of the magnet clamp 250 are the same, and the hole axis of the through hole 122 and the hole axis of the through hole 250a are on the same straight line. Yes, it is located at the mounting portion 240a of the crosshead 240. On the other hand, the through holes 820a of the movable mold 820 are arranged on the same straight line as the hole axes of the through holes 122 and the through holes 250a, but the number of the through holes 820a is larger than the number of the through holes 122 and the through holes 250a. There are few. Therefore, the mounting portion 240a of the crosshead 240 is either a first mounting portion or a second mounting portion.

The control device 700 confirms whether or not the ejector rod 230 is attached to all the first attachment portions of the attachment portions 240a of the crosshead 240 (step S16).

For example, it is assumed that the through holes 820a of the movable mold 820 are located at two positions, H1 and H2 shown in FIG. 7. In this case, the through hole 122 of the movable platen 120, which is on the same straight line as the hole axis of the through hole 820a at the positions of H1 and H2 shown in FIG. 7, becomes the position of PH1 and PH3 shown in FIG. 8, and the magnet clamp 250. The through hole 250a of the above is the position of PM1 and PM3 shown in FIG.

FIG. 11 shows a state in which the ejector rod 230 inserted into the through hole 122 and the through hole 250a and attached to the mounting portion 240a is viewed from the movable mold 820 side in the forward / backward direction of the ejector rod 230. As shown in FIG. 11, it is assumed that the ejector rod 230 is inserted into PM1 and PM3, PH1 (see FIG. 8) and PH3 (see FIG. 8), and attached to the attachment portion 240a. In this case, the control device 700 determines that the ejector rod 230 is attached at the first attachment portion of the attachment portions 240a of the crosshead 240. Even if the following mold device 800 is attached to the injection molding machine 10 and the ejector rod 230 is advanced toward the movable mold 820, the ejector rod 230 does not collide with the movable mold 820.

On the other hand, the through hole 122 of the movable platen 120 arranged at a position deviated from the hole axis of the through hole 820a at the positions of H1 and H2 shown in FIG. 7 is the position of PH2, PH4, and PH5 shown in FIG. Become. Similarly, the through hole 250a of the magnet clamp 250, which is arranged at a position deviated from the hole axis of the through hole 820a at the positions of H1 and H2 shown in FIG. 7, is the position of PM2, PM4, and PM5 shown in FIG. Will be.

FIG. 12 shows a state in which the ejector rod 230 inserted into the through hole 122 and the through hole 250a and attached to the mounting portion 240a is viewed from the movable mold 820 side in the forward / backward direction of the ejector rod 230. As shown in FIG. 12, it is assumed that the ejector rod 230 is inserted into PM4 and PH4 (see FIG. 7) and PM5 and PH5 (see FIG. 7) and attached to the attachment portion 240a. In this case, the control device 700 determines that the ejector rod 230 is attached at the second attachment portion of the attachment portions 240a of the crosshead 240. When the following mold device 800 is attached to the injection molding machine 10 and the ejector rod 230 is advanced toward the movable mold 820, the ejector rod 230 collides with the movable mold 820.

As shown in FIGS. 11 and 12, the state of the ejector rod 230 when viewed from the movable mold 820 in the forward / backward view of the ejector rod 230 can be displayed on the display device 760. As shown in FIG. 11, the display device 760 can display an OK mark on the screen when it is determined that the ejector rods 230 are attached to all the first attachment portions of the attachment portions 240a. As shown in FIG. 12, the display device 760 can display an NG mark on the screen when it is determined that the ejector rod 230 is attached to any of the second attachment portions of the attachment portions 240a.

In step S16, when the control device 700 determines that the ejector rods 230 are attached to all the first attachment portions of the attachment portions 240a, the control device 700 determines that all the attachment portions 240a are attached to the ejector rods 230. It is confirmed whether the ejector rod 230 is attached to the second attachment portion (step S17).

In step S17, when the control device 700 determines that the ejector rods 230 are not attached to all the second attachment portions of the attachment portions 240a, the control device 700 drives the ejector motor 210 to retract the crosshead 240. Let me. Since the ejector rod 230 is attached to the crosshead 240, the ejector rod 230 retracts in accordance with the retracting of the crosshead 240. The control device 700 retracts the ejector rod 230 from the through hole 820a of the movable mold 820 and the through hole 250a of the magnet clamp 250. Then, the ejector rod 230 is retracted to a position where the front end portion of the ejector rod 230 is located behind the front surface of the movable platen main body portion 121 (step S18).

After that, the next mold device 800 is attached to the mold clamping device 100.

On the other hand, if the control device 700 determines in step S16 that the ejector rods 230 are not attached to all the first attachment portions of the attachment portions 240a, the control device 700 does not drive the ejector motor 210. In this way, the stopped state of the crosshead 240 is maintained. Then, the ejector rod 230 is maintained in a state of penetrating the through hole 122 of the movable platen 120 and the through hole 250a of the magnet clamp 250. Then, the front end portion of the ejector rod 230 is projected forward of the movable platen main body portion 121, and the ejector rod 230 is maintained in a stopped state so as not to move rearward (step S19).

In step S17, it is assumed that the control device 700 determines that the ejector rod 230 is attached to any of the second attachment portions of the attachment portions 240a. In this case, the control device 700 similarly prevents the ejector motor 210 from being driven, maintains the stopped state of the crosshead 240, and maintains the stopped state of the ejector rod 230 (step S19).

In FIG. 10, in step S13, the ejector rod 230 already attached to the crosshead 240 is removed and another ejector rod 230 is replaced with the crosshead 240. However, in step S13, when the ejector rod 230 is not attached to the crosshead 240, it is only necessary to attach a new ejector rod 230 to the crosshead 240.

In FIG. 10, the step of acquiring the hole position information 711A (step S12) is performed after the step of advancing the crosshead 240 (step S11), but the order is not limited to this. Step S12 may be before step S11, after the step of acquiring the mounting information of the ejector rod 230 (step S13), or after the step of acquiring the mounting information of the ejector rod 230 (step S14). ..

In the injection molding machine 10 having the above configuration, the ejector rod 230 attached to the crosshead 240 is the same as the through hole 820a of the movable mold 820 when the mold device 800 is attached to the crosshead 240. It can be confirmed whether or not it is mounted by the first mounting portion arranged on the wire. Therefore, when the mold device 800 is replaced and the next mold device 800 is attached to the injection molding machine 10 for use, even if the ejector rod 230 advances to the movable mold 820 side, the ejector rod 230 can be moved to the movable mold. It can be passed through the through hole 820a of the 820. As a result, it is possible to reduce the collision of the ejector rod 230 with the movable mold 820.

Therefore, in the injection molding machine 10, the ejector rod 230 pushes out the movable mold 820, so that the movable mold 820 can be prevented from being separated from the magnet clamp 250 and the movable mold 820 can be prevented from falling from the magnet clamp 250. Further, it is possible to reduce the possibility that the ejector rod 230 collides with the movable mold 820 and is deformed.

(Transformation and improvement)
Although the embodiments of the injection molding machine have been described above, the present invention is not limited to the above embodiments and the like, and various modifications and variations are made within the scope of the gist of the present invention described in the claims. Improvement is possible.

In the present embodiment, the proximity sensor 260 is used as the detection unit to detect the mounting position as information regarding the mounting of the ejector rod 230, but the present invention is not limited to this. For example, a pressure sensor may be used as the detection unit to detect the looseness of the ejector rod 230 in the mounting portion 240a of the crosshead 240 as information regarding the mounting of the ejector rod 230. 13 and 14 show an example of a state in which the pressure sensor is applied to the ejector rod 230 as the detection unit. FIG. 13 is a partially enlarged cross-sectional view showing an example of the ejector rod 230 in a state where the pressure sensor is attached, and FIG. 14 is a view seen from the I-I direction in FIG. As shown in FIGS. 13 and 14, the pressure sensor 270 is formed in a ring shape and has a gap with the rear end portion 230a on the outer peripheral surface of the rear end portion 230a of the ejector rod 230 inserted into the mounting portion 240a. It is provided. The pressure sensor 270 is installed in a state of being sandwiched between the surface of the crosshead 240 and the main body 230b of the ejector rod 230.

The pressure sensor 270 detects the contact pressure between the surface of the crosshead 240 and the main body 230b of the ejector rod 230, and transmits a detection signal to the control device 700. By providing the pressure sensor 270 on each ejector rod 230, the control device 700 can confirm the tightening condition of each ejector rod 230 to the mounting portion 240a. As a result, the control device 700 can measure the looseness of each ejector rod 230 at the mounting portion 240a. When the control device 700 determines that the mounting portion 240a of any of the ejector rods 230 is loose, the control device 700 displays a mark on the screen of the display device 760, generates a sound, or the like to generate an operator. May be notified to. In this case, the worker re-tightens the ejector rod 230 loosely attached to the attachment portion 240a.

Further, the control device 700 detects the position of each ejector rod 230 in addition to the looseness in the attachment portion 240a of the ejector rod 230 as information regarding the attachment of the ejector rod 230 from the detection signals of the respective pressure sensors 270. You can also. In this case, the control device 700 collates the hole position information 711A with the detection signal of the pressure sensor 270, and similarly to the above, all the ejector rods 230 have the first mounting portion of the crosshead 240 and the second. Check which of the mounting parts it is mounted on. When the control device 700 determines that the ejector rod 230 is attached to any of the second attachment portions of the attachment portions 240a, the control device 700 displays a mark on the screen of the display device 760, for example, by a worker or the like. May be notified to. In this case, the worker reattaches the ejector rod 230.

As the pressure sensor 270, for example, a semiconductor pressure sensor utilizing the piezoresistive effect can be used. Although the pressure sensor 270 is formed in a ring shape, it does not have to be in a ring shape.

In the present embodiment, an image pickup device may be used instead of the proximity sensor 260 as a detection unit for detecting the position of the ejector rod 230. FIG. 15 shows an example of a state in which the image pickup device is applied to the ejector device 200 as the detection unit. FIG. 15 is a side view showing an example of an ejector device 200 equipped with an image pickup device. As shown in FIG. 15, an image pickup device 280 is provided at the upper end of the fixed platen 110 so that the entire surface of the main surface of the magnet clamp 250 on the fixed platen 110 side can be photographed. The image pickup apparatus 280 photographs the entire surface of the fixed platen 110 side, and transmits the captured image to the control device 700. Since it can be confirmed from the image taken by the image pickup apparatus 280 that the ejector rod 230 is attached to each attachment portion 240a, the control device 700 can acquire the attachment position information of the ejector rod 230.

The control device 700 collates the hole position information 711A with the image taken by the image pickup device 280 as the mounting position information. When the control device 700 determines that the ejector rods 230 are attached to all the first attachment portions of the attachment portions 240a, the control device 700 may display an OK mark on the screen of the display device 760. When the control device 700 determines that the ejector rod 230 is attached to any of the second mounting portions, the control device 700 works by displaying an NG mark on the screen of the display device 760 or generating a sound. You may notify the member. In this case, the worker reattaches the ejector rod 230.

Specifically, as the image pickup apparatus 280, a camera or the like can be used.

Further, the control device 700 may analyze and acquire the length of the ejector rod 230 as information regarding mounting using the image taken by the image pickup device 280. In this case, the control device 700 determines the length of the ejector rod 230 stored as mold information in the storage unit 711 and the length of the ejector rod 230 acquired from the image taken by the image pickup device 280 as information regarding mounting. Match. Then, when the control device 700 determines that the lengths of all the ejector rods 230 acquired as the information regarding the mounting are the same as the lengths of the ejector rods 230 stored in the storage unit 711, the display device 700 determines. The OK mark may be displayed on the screen of 760. On the other hand, when the control device 700 determines that the length of any of the ejector rods 230 acquired as the information regarding the mounting is different from the length of the ejector rod 230 stored in the storage unit 711, the same as above is performed. In addition, the worker reattaches the ejector rod 230 by notifying the worker or the like by displaying a mark on the screen of the display device 760 or the like.

In the present embodiment, a laser irradiation device may be used instead of the proximity sensor 260 as the detection unit for detecting the position of the ejector rod 230. FIG. 16 shows an example of a state in which the laser irradiation device is applied to the ejector device 200 as the detection unit. FIG. 16 is a side view showing an example of an ejector device 200 equipped with a laser irradiation device. As shown in FIG. 16, the laser irradiation device 290 is provided on the surface of the fixed platen 110 facing the movable platen 120. In the laser irradiation device 290, the irradiation direction of the laser beam 291 emitted from the laser irradiation device 290 is the same as the hole axis of the through hole 820a of the movable mold 820 when the movable mold 820 is attached to the mold clamping device 100. Install in a straight position.

The laser irradiation device 290 irradiates the laser light 291 from the laser irradiation device 290 toward the main surface side of the magnet clamp 250, and measures the time for the irradiated laser light 291 to return to the laser irradiation device 290. The laser irradiation device 290 transmits the detection result to the control device 700.

When the laser light 291 emitted from the laser irradiation device 290 is irradiated toward the front end portion of the ejector rod 230, the laser light 291 is reflected by the front end portion of the ejector rod 230 and returns to the laser irradiation device 290 side. come.

It is assumed that the laser beam 291 is irradiated toward the through hole 250a into which the ejector rod 230 is not inserted. In this case, the laser beam 291 passes through the through hole 250a of the magnet clamp 250 and the through hole 122 of the movable platen 120, is reflected by the mounting portion 240a of the crosshead 240, and returns to the laser irradiation device 290 side.

When the laser beam 291 is irradiated toward a position where the through hole 250a of the magnet clamp 250 does not exist, the laser beam 291 is reflected by the surface of the magnet clamp 250 and returns to the laser irradiation device 290 side.

Since the control device 700 can measure the return time for the laser light 291 emitted from each laser irradiation device 290 to return to the laser irradiation device 290 and detect the position where the ejector rod 230 is attached to the crosshead 240. , The control device 700 can acquire the mounting position information of the ejector rod 230. The control device 700 collates the hole position information 711A with the position of the ejector rod 230 detected as the mounting position information. Then, when the control device 700 determines that the ejector rods 230 are attached to all the first attachment portions of the attachment portions 240a, the control device 700 may display an OK mark on the screen of the display device 760. .. On the other hand, when the control device 700 determines that the ejector rod 230 is attached to any of the second attachment portions of the attachment portions 240a, the control device 700 may notify the worker or the like in the same manner as described above. In this case, the worker reattaches the ejector rod 230.

Further, the control device 700 may acquire the length of the ejector rod 230 as information regarding mounting from the return time of the laser beam 291. In this case, the control device 700 collates the length of the ejector rod 230 stored as mold information in the storage unit 711 with the length of the ejector rod 230 acquired from the return time of the laser beam 291 as mounting information. Then, when the control device 700 determines that the lengths of all the ejector rods 230 acquired as the mounting information are the same as the lengths of the ejector rods 230 stored in the storage unit 711, the same as above. In addition, the OK mark may be displayed on the screen of the display device 760. On the other hand, when the control device 700 determines that the length of any of the ejector rods 230 acquired as the mounting information is different from the length of the ejector rod 230 stored in the storage unit 711, the same as above is performed. The worker reattaches the ejector rod 230 by notifying the worker or the like by displaying a mark on the screen of the display device 760 or the like.

In this embodiment, only the proximity sensor 260 is used as the detection unit, but the proximity sensor 260, the pressure sensor 270 shown in FIGS. 13 and 14, the image pickup device 280 shown in FIG. 15, and the laser irradiation device 290 shown in FIG. 16 Any one or more may be combined.

The ejector device 200 includes a magnet clamp 250, and the movable mold 820 is attached to the movable platen 120 by using the magnet clamp 250. However, the ejector device 200 does not include the magnet clamp 250, and the movable mold 820 may be attached to the movable platen 120 with screws or the like.

The ejector device 200 of the above embodiment is attached to the movable platen 120, but may be attached to the fixed platen 110.

Further, when the mold clamping device 100 is a vertical type, the ejector device 200 may be attached to the lower platen. The lower platen may be a movable platen or a fixed platen as described above.

10 Injection molding machine 100 Mold clamping device 120 Movable platen 121 Movable platen body 122, 250a, 820a Through hole 200 Ejector device 230 Ejector rod 240 Cross head 240a Mounting position 250 Magnet clamp 260 Proximity sensor 270 Pressure sensor 280 Imaging device 290 Laser irradiation Device 800 Mold device 820 Movable mold

Claims (3)

An ejector rod for sticking out the molded product,
The crosshead to which the ejector rod is attached and
It has a control device for controlling the advance and retreat of the ejector rod, and has.
The control device is
A storage unit that stores the first information regarding the attachment of the ejector rod to the crosshead, and
An acquisition unit that acquires second information regarding the attachment of the ejector rod to the crosshead, and
A collation unit that collates the first information stored in the storage unit with the second information acquired by the acquisition unit, and
Have,
The first information is provided in the mold apparatus as identification information, and is provided.
The storage unit is an injection molding machine that stores the identification information read and sent by a reader. The first aspect of the present invention, wherein the collation unit collates the information of the position where the ejector rod is attached stored in the storage unit with the information of the attachment position of the ejector rod acquired by the acquisition unit. Injection molding machine. The collating unit 1 or 2 collates the information of the position where the ejector rod is not attached stored in the storage unit with the information of the mounting position of the ejector rod acquired by the acquiring unit. The injection molding machine described in.

Images