CN117734131A - Injection molding machine - Google Patents

Abstract

The present invention relates to an injection molding machine, and provides a technique for suppressing malfunction of the injection molding machine. The injection molding machine is provided with: a driving section; a driven part driven by the driving part; a detector provided in the driving unit, for detecting a driving state of the driven unit and outputting a detection signal; and a control device for receiving the detection signal and controlling the driving of the driving part. The detector has a 1 st memory, and the control device has a 2 nd memory storing information common to the 1 st memory. When the common information is not identical in the 1 st memory and the 2 nd memory, the control device limits the driving of the driving unit.

Description

Injection molding machine

Technical Field

The present application claims priority based on japanese patent application No. 2022-148920 filed on day 20 of 9 of 2022. The entire contents of this japanese application are incorporated by reference into the present specification.

The present invention relates to an injection molding machine.

Background

The injection molding machine described in patent document 1 includes a driving unit, a driven unit driven by the driving unit, a detector provided in the driving unit and detecting a driving condition of the driven unit and outputting a detection signal, and a control device controlling driving of the driving unit based on the detection signal from the detector. The driving unit is, for example, a motor, and the detector is, for example, an encoder for detecting rotation of the motor.

The detector has a 1 st memory and the control device has a 2 nd memory. The 1 st memory and the 2 nd memory store common information. Thus, when at least one of the detector and the control device is replaced, the common information can be compared or rewritten.

The control device performs the above comparison when the power supply of the injection molding machine is turned on. When the common information is inconsistent, the control device performs control of notifying by the alarm and control of displaying inconsistent contents on the display.

Patent document 1: japanese patent No. 4005922

When the common information is not identical in the 1 st memory and the 2 nd memory, at least one of the detector and the control device has erroneous information. If the driving unit is driven based on the erroneous information, malfunction may occur.

Disclosure of Invention

One embodiment of the present invention provides a technique for suppressing malfunction of an injection molding machine.

An injection molding machine according to an aspect of the present invention includes a driving unit, a driven unit driven by the driving unit, a detector provided in the driving unit and detecting a driving condition of the driven unit and outputting a detection signal, and a control device that receives the detection signal and controls driving of the driving unit. The detector has a 1 st memory, and the control device has a 2 nd memory storing information common to the 1 st memory. When the common information is not identical in the 1 st memory and the 2 nd memory, the control device limits the driving of the driving unit.

ADVANTAGEOUS EFFECTS OF INVENTION

According to one aspect of the present invention, when the common information is not identical in the 1 st memory and the 2 nd memory, the driving of the driving unit is restricted. This can suppress malfunction due to erroneous information.

Drawings

Fig. 1 is a diagram showing a state at the end of mold opening of an injection molding machine according to one embodiment.

Fig. 2 is a diagram showing a state at the time of mold closing of the injection molding machine according to the embodiment.

Fig. 3 is a diagram showing an example of a feedback control system.

Fig. 4 is a diagram showing an example of a combination of a motor, a driven part, and an encoder.

Fig. 5 is a diagram showing an example of adjustment of the magnetic pole position of the motor.

Fig. 6 is a diagram showing an example of processing performed by the control device according to the embodiment.

Fig. 7 is a diagram showing an example of information to be compared at the time of normal operation.

Fig. 8 is a diagram showing an example of information to be compared when the encoder and the control device are newly manufactured or replaced at the same time.

Fig. 9 is a diagram showing an example of information compared when only the encoder is replaced.

Fig. 10 is a diagram showing an example of information compared when only the control device is replaced.

Description of symbols

10-injection molding machine, 20-motor (driving part), 30-driven part, 40-encoder (detector), 41-1 st memory, 70-control device, 71-2 nd memory.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding structures may be denoted by the same reference numerals, and description thereof may be omitted.

(injection Molding machine)

Fig. 1 is a diagram showing a state at the end of mold opening of an injection molding machine according to one embodiment. Fig. 2 is a diagram showing a state at the time of mold closing of the injection molding machine according to the embodiment. In the present specification, the X-axis direction, the Y-axis direction, and the Z-axis direction are directions perpendicular to each other. The X-axis direction and the Y-axis direction represent horizontal directions, and the Z-axis direction represents vertical directions. When the mold clamping device 100 is horizontal, the X-axis direction is the mold opening/closing direction, and the Y-axis direction is the width direction of the injection molding machine 10. The negative side in the Y-axis direction is referred to as the operation side, and the positive side in the Y-axis direction is referred to as the opposite side to the operation side.

As shown in fig. 1 to 2, the injection molding machine 10 includes: a mold clamping device 100 for opening and closing the mold device 800; an ejector 200 for ejecting the molded article molded by the mold device 800; an injection device 300 injecting a molding material to the mold device 800; a moving device 400 for advancing and retreating the injection device 300 with respect to the mold device 800; a control device 700 for controlling the respective constituent elements of the injection molding machine 10; and a frame 900 for supporting the components of the injection molding machine 10. The frame 900 includes a clamping device frame 910 that supports the clamping device 100 and an injection device frame 920 that supports the injection device 300. The mold clamping device frame 910 and the injection device frame 920 are respectively provided on the bottom plate 2 via horizontal adjustment casters 930. The control device 700 is disposed in the internal space of the injection device frame 920. The following describes the respective constituent elements of the injection molding machine 10.

(mold clamping device)

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

The mold clamping device 100 performs mold closing, pressure increasing, mold clamping, pressure releasing, and mold opening of the mold device 800. The mold apparatus 800 includes a stationary mold 810 and a movable mold 820.

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

The stationary platen 110 is fixed relative to the clamp frame 910. A stationary mold 810 is mounted on a surface of the stationary platen 110 opposite to the movable platen 120.

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

The moving mechanism 102 performs mold closing, pressure increasing, mold closing, pressure releasing, and mold opening of the mold apparatus 800 by advancing and retracting the movable platen 120 relative to the fixed platen 110. The moving mechanism 102 includes a toggle base 130 disposed at a distance from the fixed platen 110, a link 140 connecting the fixed platen 110 and the toggle base 130, a toggle mechanism 150 moving the movable platen 120 relative to the toggle base 130 in the mold opening/closing direction, a mold clamping motor 160 operating the toggle mechanism 150, a motion conversion mechanism 170 converting the rotational motion of the mold clamping motor 160 into a linear motion, and a mold thickness adjustment mechanism 180 adjusting the distance between the fixed platen 110 and the toggle base 130.

The toggle seat 130 is disposed at a distance from the fixed platen 110, and is mounted on the clamping device frame 910 so as to be movable in the mold opening/closing direction. The toggle mount 130 may be configured to be movable along a guide provided on the clamp frame 910. The guide of the toggle seat 130 may be common to the guide 101 of the movable platen 120.

In the present embodiment, the stationary platen 110 is fixed to the clamping device frame 910, and the toggle mount 130 is disposed so as to be movable in the mold opening and closing direction with respect to the clamping device frame 910, but the toggle mount 130 may be fixed to the clamping device frame 910, and the stationary platen 110 may be disposed so as to be movable in the mold opening and closing direction with respect to the clamping device frame 910.

The connecting rod 140 connects the fixed platen 110 and the toggle base 130 with a space L therebetween in the mold opening and closing direction. Multiple (e.g., 4) connecting rods 140 may be used. The plurality of tie bars 140 are arranged parallel to the mold opening and closing direction and extend according to the mold clamping force. A link strain detector 141 detecting strain of the link 140 may be provided on at least 1 link 140. The link strain detector 141 transmits a signal indicating the detection result to the control device 700. The detection result of the tie bar strain detector 141 is used for detection of the clamping force or the like.

In the present embodiment, the tie bar strain detector 141 is used as a mold clamping force detector for detecting a mold clamping force, but the present invention is not limited thereto. The mold clamping force detector is not limited to the strain gauge type, but 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 base 130, and moves the movable platen 120 with respect to the toggle base 130 in the mold opening and closing direction. The toggle mechanism 150 has a crosshead 151 that moves in the mold opening and closing direction, and a pair of link groups that are bent and extended by the movement of the crosshead 151. The pair of link groups includes a 1 st link 152 and a 2 nd link 153, which are connected to each other by a pin or the like so as to be freely bendable. The 1 st link 152 is attached to the movable platen 120 by a pin or the like so as to be swingable. The 2 nd link 153 is attached to the toggle base 130 by a pin or the like so as to be swingable. The 2 nd link 153 is attached to the crosshead 151 via the 3 rd link 154. When the crosshead 151 is advanced and retracted relative to the toggle mount 130, the 1 st link 152 and the 2 nd link 153 are extended and retracted to advance and retract the movable platen 120 relative to the toggle mount 130.

The structure of the toggle mechanism 150 is not limited to the structure shown in fig. 1 and 2. For example, in fig. 1 and 2, the number of nodes of each link group is 5, but may be 4, or one end of the 3 rd link 154 may be connected to the node of the 1 st link 152 and the 2 nd link 153.

The clamp motor 160 is mounted to the toggle mount 130 and operates the toggle mechanism 150. The clamp motor 160 advances and retreats the crosshead 151 with respect to the toggle mount 130, and stretches the 1 st link 152 and the 2 nd link 153 to advance and retreat the movable platen 120 with respect to the toggle mount 130. The mold clamping motor 160 is directly connected to the motion conversion mechanism 170, but may be connected to the motion conversion mechanism 170 via a belt, pulley, or the like.

The motion conversion mechanism 170 converts the rotational motion of the clamp motor 160 into a linear motion of the crosshead 151. The motion conversion mechanism 170 includes a screw shaft and a screw nut screwed with the screw shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.

The mold clamping device 100 performs a mold closing process, a pressure increasing process, a mold clamping process, a pressure releasing process, a mold opening process, 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 end position at a set movement speed so that the movable mold 820 is brought into contact with the fixed mold 810. For example, the position and the moving speed of the crosshead 151 are detected using a clamp motor encoder 161 or the like. The clamp motor encoder 161 detects the rotation of the clamp motor 160, and transmits a signal indicating the detection result to the control device 700.

The crosshead position detector for detecting the position of the crosshead 151 and the crosshead moving speed detector for detecting the moving speed of the crosshead 151 are not limited to the clamp motor encoder 161, and a conventional detector may be used. The movable platen position detector for detecting the position of the movable platen 120 and the movable platen moving speed detector for detecting the moving speed of the movable platen 120 are not limited to the mold clamping motor encoder 161, and a conventional detector may be used.

In the pressure increasing step, the clamping motor 160 is further driven to further advance the crosshead 151 from the mold closing end position to the clamping position, thereby generating clamping force.

In the mold clamping step, the mold clamping motor 160 is driven to maintain the position of the crosshead 151 at the mold clamping position. In the mold clamping step, the mold clamping force generated in the pressure increasing step is maintained. In the mold clamping step, a cavity space 801 (see fig. 2) is formed between the movable mold 820 and the fixed mold 810, and the injection device 300 fills the cavity space 801 with a liquid molding material. The filled molding material is cured, thereby obtaining a molded article.

The number of cavity spaces 801 may be 1 or more. In the latter case, a plurality of molded articles can be obtained at the same time. An insert may be disposed in a portion of the cavity space 801 and another portion of the cavity space 801 may be filled with molding material. A molded article in which the insert and the molding material are integrated can be obtained.

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

In the mold opening step, the movable platen 120 is retracted by driving the mold clamping motor 160 to retract the crosshead 151 from the mold opening start position to the mold opening end position at a set movement speed, so that the movable mold 820 is separated from the fixed mold 810. Then, the ejector 200 ejects the molded article from the mold 820.

The setting conditions in the mold closing step, the pressure increasing step, and the mold closing step are set in a unified manner as a series of setting conditions. For example, the moving speed, the position (including the mold closing start position, the moving speed switching position, the mold closing end position, and the mold clamping position) and the mold clamping force of the crosshead 151 in the mold closing step and the pressure increasing step are set in a unified manner as a series of setting conditions. The mold closing start position, the moving speed switching position, the mold closing end position, and the mold closing position are arranged in this order from the rear side to the front side, and indicate the start point and the end point of the section in which the moving speed is set. The movement speed is set for each section. The number of the movement speed switching positions may be 1 or plural. The moving speed switching position may not be set. Only one of the mold clamping position and the mold clamping force may be set.

The conditions for setting in the decompression step and the mold opening step are set in the same manner. For example, the moving speed and the position (the mold opening start position, the moving speed switching position, and the mold opening end position) of the crosshead 151 in the decompression step and the mold opening step are set in a unified manner as a series of setting conditions. The mold opening start position, the movement speed switching position, and the mold opening end position are arranged in this order from the front side to the rear side, and indicate the start point and the end point of the section in which the movement speed is set. The movement speed is set for each section. The number of the movement speed switching positions may be 1 or plural. The moving speed switching position may not be set. The mold opening start position and the mold closing end position may be the same position. The mold opening end position and the mold closing start position may be the same position.

In addition, instead of the moving speed, position, etc. of the crosshead 151, the moving speed, position, etc. of the movable platen 120 may be set. In addition, the clamping force may be set instead of the position of the crosshead (for example, the clamping position) and the position of the movable platen.

However, the toggle mechanism 150 amplifies the driving force of the clamp motor 160 and transmits it to the movable platen 120. Its magnification is also called toggle magnification. The toggle magnification changes according to an angle θ (hereinafter, also referred to as "link angle θ") formed by the 1 st link 152 and the 2 nd link 153. The link angle θ is obtained from the position of the crosshead 151. When the link angle θ is 180 °, the toggle magnification becomes maximum.

When the thickness of the mold device 800 changes due to replacement of the mold device 800, temperature change of the mold device 800, or the like, mold thickness adjustment is performed to obtain a predetermined clamping force at the time of clamping. In the die thickness adjustment, for example, the distance L between the fixed platen 110 and the toggle base 130 is adjusted so that the link angle θ of the toggle mechanism 150 becomes a predetermined angle at the time of contact of the movable die 820 with the die in contact with the fixed die 810.

The mold clamping device 100 has a mold thickness adjusting mechanism 180. The die thickness adjustment mechanism 180 adjusts the distance L between the fixed platen 110 and the toggle base 130, thereby performing die thickness adjustment. The timing of the mold thickness adjustment is performed, for example, during a period from the end of the molding cycle to the start of the next molding cycle. The die thickness adjusting mechanism 180 includes, for example: a screw shaft 181 formed at a rear end portion of the connection rod 140; a screw nut 182 rotatably held in the toggle seat 130 and being non-retractable; and a die thickness adjusting motor 183 for rotating a screw nut 182 screwed to the screw shaft 181.

A screw shaft 181 and a screw nut 182 are provided for each of the connection rods 140. The rotational driving force of the die thickness adjusting motor 183 may be transmitted to the plurality of lead screw nuts 182 via the rotational driving force transmitting portion 185. A plurality of lead screw nuts 182 can be rotated synchronously. Further, by changing the transmission path of the rotational driving force transmission unit 185, the plurality of lead screw nuts 182 can be rotated individually.

The rotational driving force transmitting portion 185 is constituted by a gear or the like, for example. At this time, driven gears are formed on the outer periphery of each screw nut 182, a driving gear is mounted on the output shaft of the die thickness adjusting motor 183, and an intermediate gear engaged with the driven gears and the driving gear is rotatably held at the center portion of the toggle seat 130. In addition, the rotational driving force transmitting portion 185 may be formed of a belt, a pulley, or the like instead of the gear.

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

The interval L is detected using a die thickness adjustment motor encoder 184. The die thickness adjustment motor encoder 184 detects the rotation amount and rotation direction of the die thickness adjustment motor 183, and transmits a signal indicating the detection result to the control device 700. The detection result of the die thickness adjustment motor encoder 184 is used for monitoring and controlling the position and the interval L of the toggle seat 130. The toggle seat position detector for detecting the position of the toggle seat 130 and the interval detector for detecting the interval L are not limited to the die thickness adjusting motor encoder 184, and a conventional detector may be used.

The mold clamping device 100 may have a mold temperature regulator that regulates the temperature of the mold device 800. The die device 800 has a flow path for the temperature control medium therein. The mold temperature regulator regulates the temperature of the temperature regulating medium supplied to the flow path of the mold device 800, thereby regulating the temperature of the mold device 800.

The mold clamping device 100 of the present embodiment is a horizontal mold opening/closing direction, but may be a vertical mold opening/closing direction.

The mold clamping device 100 of the present embodiment includes the mold clamping motor 160 as a driving unit, but may include a hydraulic cylinder instead of the mold clamping motor 160. The mold clamping device 100 may include a linear motor for mold opening and closing, or may include an electromagnet for mold clamping.

(ejector device)

In the description of the ejector 200, the moving direction (for example, the positive X-axis direction) of the movable platen 120 during mold closing is set to the front, and the moving direction (for example, the negative X-axis direction) of the movable platen 120 during mold opening is set to the rear, similarly to the description of the mold clamping device 100 and the like.

The ejector 200 is attached to the movable platen 120 and advances and retreats together with the movable platen 120. The ejector 200 includes: an ejector rod 210 ejecting the molded article from the mold device 800; and a driving mechanism 220 for moving the ejector rod 210 in the moving direction (X-axis direction) of the movable platen 120.

The ejector rod 210 is disposed so as to be movable in and out of the through hole of the movable platen 120. The front end of the ejector rod 210 contacts the ejector plate 826 of the movable mold 820. The tip end of the ejector rod 210 may or may not be connected to the ejector plate 826.

The driving mechanism 220 includes, for example, an ejector motor and a motion conversion mechanism that converts rotational motion of the ejector motor into linear motion of the ejector rod 210. The motion conversion mechanism comprises a screw shaft and a screw nut screwed with the screw shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.

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

The position and moving speed of the ejector rod 210 are detected, for example, using an ejector motor encoder. The ejector motor encoder detects the rotation of the ejector motor and transmits a signal indicating the detection result to the control device 700. The ejector rod position detector that detects the position of the ejector rod 210 and the ejector rod movement speed detector that detects the movement speed of the ejector rod 210 are not limited to the ejector motor encoder, and a conventional detector may be used.

(injection device)

In the description of the injection device 300, the direction of movement of the screw 330 (for example, the negative X-axis direction) during filling is set to the front, and the direction of movement of the screw 330 (for example, the positive X-axis direction) during metering is set to the rear, unlike the description of the mold clamping device 100 and the description of the ejector 200.

The injection device 300 is provided on the slide base 301, and the slide base 301 is disposed so as to be movable relative to the injection device frame 920. The injection device 300 is disposed so as to be movable in and out of the mold device 800. The injection device 300 is in contact with the mold device 800 and fills the cavity space 801 in the mold device 800 with molding material. The injection device 300 includes, for example, a cylinder 310 for heating a molding material, a nozzle 320 provided at a distal end portion of the cylinder 310, a screw 330 rotatably disposed in the cylinder 310, a metering motor 340 for rotating the screw 330, an injection motor 350 for advancing and retreating the screw 330, and a load detector 360 for detecting a load transmitted between the injection motor 350 and the screw 330.

The cylinder 310 heats the molding material supplied from the supply port 311 to the inside. The molding material includes, for example, a resin or the like. The molding material is formed into, for example, a pellet shape, and is supplied in a solid state to the supply port 311. 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 block 310. A 1 st heater 313 such as a belt heater and a 1 st 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 regions along an axial direction (e.g., an X-axis direction) of the cylinder 310. The 1 st heater 313 and the 1 st temperature detector 314 are provided in each of the plurality of regions. The control device 700 controls the 1 st heater 313 so that the temperature detected by the 1 st temperature detector 314 becomes the set temperature.

The nozzle 320 is provided at the front end of the cylinder 310, and presses the die device 800. A 2 nd heater 323 and a 2 nd temperature detector 324 are provided on the outer periphery of the nozzle 320. The control device 700 controls the 2 nd heater 323 so that the detected temperature of the nozzle 320 becomes the set temperature.

The screw 330 is rotatably disposed in the cylinder 310 and is movable forward and backward. When the screw 330 is rotated, the molding material is conveyed forward along the spiral groove of the screw 330. The molding material is gradually melted by heat from the cylinder 310 while being conveyed forward. As the molding material in the liquid state is conveyed to the front of the screw 330 and accumulated in the front of the cylinder 310, the screw 330 is retracted. Then, when the screw 330 is advanced, the liquid molding material accumulated in front of the screw 330 is injected from the nozzle 320 and filled in the mold device 800.

The check ring 331 is attached to the front of the screw 330 so as to be movable forward and backward, and the check ring 331 serves as a check valve to prevent the molding material from flowing backward from the front of the screw 330 when the screw 330 is pushed forward.

When the screw 330 is advanced, the check ring 331 is pushed rearward by the pressure of the molding material in front of the screw 330, and retreats relatively to the screw 330 to a closed position (see fig. 2) blocking the flow path of the molding material. This prevents the molding material accumulated in front of the screw 330 from flowing backward.

On the other hand, when the screw 330 is rotated, the check ring 331 is pushed forward by the pressure of the molding material conveyed forward along the spiral groove of the screw 330, and relatively advances to the open position (refer to fig. 1) for opening the flow path of the molding material with respect to the screw 330. Thereby, the molding material is conveyed to the front of the screw 330.

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

In addition, the injection device 300 may have a driving source that advances and retreats the check ring 331 with respect to the screw 330 between the open position and the closed position.

The metering motor 340 rotates the screw 330. The driving source for rotating the screw 330 is not limited to the metering motor 340, and may be, for example, a hydraulic pump.

Injection motor 350 advances and retracts screw 330. A motion conversion mechanism or the like for converting the rotational motion of injection motor 350 into the linear motion of screw 330 is provided between injection motor 350 and screw 330. The motion conversion mechanism includes, for example, a screw shaft and a screw nut screwed to the screw shaft. Balls, rollers, etc. may be provided between the screw shaft and the screw nut. The driving source for advancing and retreating the screw 330 is not limited to the injection motor 350, and may be, for example, a hydraulic cylinder or the like.

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

The load detector 360 transmits a signal of the detected load to the control device 700. The load detected by the load detector 360 is converted into a pressure acting between the screw 330 and the molding material, and is used for controlling and monitoring the back pressure of the screw 330 and the pressure acting on the molding material from the screw 330, etc. by the pressure received by the screw 330 from the molding material.

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

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

In the metering step, the metering motor 340 is driven to rotate the screw 330 at a set rotational speed, and the molding material is conveyed forward along the spiral groove of the screw 330. Thereby, the molding material is gradually melted. As the molding material in the liquid state is conveyed to the front of the screw 330 and accumulated in the front of the cylinder 310, the screw 330 is retracted. The rotational speed of screw 330 is detected, for example, using a metering motor encoder 341. The metering motor encoder 341 detects the rotation of the metering motor 340 and transmits a signal indicating the detection result to the control device 700. The screw rotation speed detector for detecting the rotation speed of the screw 330 is not limited to the metering motor encoder 341, and a conventional detector can be used.

In the metering step, injection motor 350 may be driven to apply a set back pressure to screw 330 in order to limit rapid retraction of screw 330. The back pressure on the screw 330 is detected, for example, using a load detector 360. When the screw 330 is retracted to the metering end position and a predetermined amount of molding material is accumulated in front of the screw 330, the metering process ends.

The position and rotation speed of the screw 330 in the metering step are set uniformly as a series of setting conditions. For example, a measurement start position, a rotation speed switching position, and a measurement end position are set. These positions are arranged in order from the front side to the rear side, and indicate the start point and the end point of the section in which the rotational speed is set. The rotational speed is set for each section. The number of rotational speed switching positions may be 1 or a plurality of rotational speed switching positions. The rotational speed switching position may not be set. Back pressure is set for each section.

In the filling step, the injection motor 350 is driven to advance the screw 330 at a set moving speed, and the cavity space 801 in the mold apparatus 800 is filled with the liquid molding material stored in front of the screw 330. The position and moving speed of the screw 330 are detected, for example, using the injection motor encoder 351. The injection motor encoder 351 detects the rotation of the injection motor 350 and transmits a signal indicating the detection result thereof to the control device 700. When the position of the screw 330 reaches the set position, the filling process is switched to the pressure maintaining process (so-called V/P switching). The position where the V/P switch is performed is also referred to as a V/P switch position. The set moving speed of the screw 330 may be changed according to the position, time, etc. of the screw 330.

The position and the moving speed of the screw 330 in the filling process are set uniformly as a series of setting conditions. For example, a filling start position (also referred to as an "injection start position"), a moving speed switching position, and a V/P switching position are set. These positions are arranged in this order from the rear side to the front side, and indicate the start point and the end point of the section in which the movement speed is set. The movement speed is set for each section. The number of the movement speed switching positions may be 1 or plural. The moving speed switching position may not be set.

The upper limit value of the pressure of the screw 330 is set for each section in which the moving speed of the screw 330 is set. The pressure of the screw 330 is detected by a load detector 360. When the pressure of the screw 330 is below the set pressure, the screw 330 advances at the set moving speed. On the other hand, when the pressure of the screw 330 exceeds the set pressure, the screw 330 is advanced at a movement speed slower than the set movement speed so that the pressure of the screw 330 becomes equal to or lower than the set pressure in order to protect the mold.

In the filling step, after the position of the screw 330 reaches the V/P switching position, the screw 330 may be suspended at the V/P switching position and then V/P switching may be performed. Instead of stopping the screw 330, the screw 330 may be advanced at a slight speed or retracted at a slight speed immediately before the V/P switching. The screw position detector for detecting the position of the screw 330 and the screw movement speed detector for detecting the movement speed of the screw 330 are not limited to the injection motor encoder 351, and a conventional detector may be used.

In the pressure maintaining step, the injection motor 350 is driven to push the screw 330 forward, and the pressure of the molding material at the tip end portion of the screw 330 (hereinafter, also referred to as "holding pressure") is maintained at a set pressure, so that the molding material remaining in the cylinder 310 is pushed to the mold device 800. An insufficient amount of molding material due to cooling shrinkage in the mold device 800 can be replenished. The holding pressure is detected, for example, using a load detector 360. The set value of the holding pressure may be changed according to the elapsed time from the start of the pressure-maintaining process. The holding pressure and the holding time for holding the holding pressure in the plurality of holding pressure steps may be set individually or may be set collectively as a series of setting conditions.

In the pressure maintaining step, the molding material in the cavity space 801 in the mold device 800 is gradually cooled, and at the end of the pressure maintaining step, the inlet of the cavity space 801 is blocked by the solidified molding material. This state is called gate sealing, and prevents backflow of molding material from the cavity space 801. After the pressure maintaining process, a cooling process is started. In the cooling step, solidification of the molding material in the cavity space 801 is performed. The metering step may be performed in the cooling step in order to shorten the molding cycle time.

The injection device 300 of the present embodiment is of a coaxial screw type, but may be of a pre-molding type or the like. The injection device of the pre-molding method supplies the molding material melted in the plasticizing cylinder to the injection cylinder, and injects the molding material from the injection cylinder into the mold device. In the plasticizing cylinder, the screw is rotatably disposed so as not to advance and retreat, or the screw is rotatably disposed so as to advance and retreat. On the other hand, in the injection cylinder, the plunger is disposed so as to be movable forward and backward.

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 vertical. The mold clamping device combined with the vertical injection device 300 may be either vertical or horizontal. Similarly, the mold clamping device combined with the horizontal injection device 300 may be either horizontal or vertical.

(Mobile device)

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

The movement device 400 advances and retracts the injection device 300 relative to the mold device 800. The moving device 400 presses the nozzle 320 against the die device 800 to generate a nozzle contact pressure. The traveling apparatus 400 includes a hydraulic pump 410, a motor 420 as a driving source, a hydraulic cylinder 430 as a hydraulic actuator, and the like.

The hydraulic pump 410 has a 1 st port 411 and a 2 nd port 412. The hydraulic pump 410 is a pump capable of rotating in both directions, and generates hydraulic pressure by switching the rotation direction of the motor 420 so that a working fluid (for example, oil) is sucked from one of the 1 st port 411 and the 2 nd port 412 and discharged from the other port. The hydraulic pump 410 may suck the working fluid from the tank and discharge the working fluid from any one of the 1 st port 411 and the 2 nd port 412.

The motor 420 operates the hydraulic pump 410. The motor 420 drives the hydraulic pump 410 by a rotation direction and a torque corresponding to a control signal from the control device 700. The motor 420 may be an electric motor or an electric servo motor.

Hydraulic cylinder 430 has a cylinder body 431, a piston 432, and a piston rod 433. Cylinder body 431 is fixed relative to injection device 300. Piston 432 divides the interior of cylinder body 431 into a front chamber 435 that is a 1 st chamber and a rear chamber 436 that is a 2 nd chamber. The piston rod 433 is fixed with respect to the fixed platen 110.

The front chamber 435 of the hydraulic cylinder 430 is connected to the 1 st port 411 of the hydraulic pump 410 via the 1 st flow path 401. The working fluid discharged from the 1 st port 411 is supplied to the front chamber 435 via the 1 st flow path 401, and the injection device 300 is pushed forward. The injection device 300 is advanced and the nozzle 320 is pressed against the stationary mold 810. The front chamber 435 functions as a pressure chamber that generates a nozzle contact pressure of the nozzle 320 by the pressure of the working fluid supplied from the hydraulic pump 410.

On the other hand, the rear chamber 436 of the hydraulic cylinder 430 is connected to the 2 nd port 412 of the hydraulic pump 410 via the 2 nd flow path 402. The working fluid discharged from the 2 nd port 412 is supplied to the rear chamber 436 of the hydraulic cylinder 430 via the 2 nd flow path 402, whereby the injection device 300 is pushed rearward. The injection device 300 is retracted and the nozzle 320 is separated from the stationary mold 810.

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

(control device)

As shown in fig. 1 to 2, the control device 700 is configured by a computer, for example, and includes a CPU (Central Processing Unit: central processing unit) 701, a storage medium 702 such as a memory, an input interface 703, and an output interface 704. The control device 700 performs various controls by causing the CPU701 to execute a program stored in the storage medium 702. The control device 700 receives a signal from the outside through the input interface 703 and transmits a signal to the outside through the output interface 704.

The control device 700 repeatedly performs a metering process, a mold closing process, a pressure increasing process, a mold closing process, a filling process, a pressure maintaining process, a cooling process, a pressure releasing process, a mold opening process, an ejection process, and the like, to thereby repeatedly manufacture a molded product. A series of operations for obtaining a molded product, for example, an operation from the start of a metering process to the start of the next metering process is also referred to as "injection" or "molding cycle". The time required for one shot is also referred to as "molding cycle time" or "cycle time".

The one-shot molding cycle includes, for example, a metering step, a mold closing step, a pressure increasing step, a mold closing step, a filling step, a pressure maintaining step, a cooling step, a pressure releasing step, a mold opening step, and an ejection step in this order. The sequence here is the sequence in which the respective steps are started. The filling step, the pressure maintaining step and the cooling step are performed during the mold closing step. The start of the mold clamping process may be coincident with the start of the filling process. The end of the decompression step corresponds to the start of the mold opening step.

In addition, a plurality of steps may be performed simultaneously for the purpose of shortening the molding cycle time. For example, the metering step may be performed in the cooling step of the previous molding cycle, or may be performed during the mold clamping step. In this case, the mold closing step may be performed at the beginning of the molding cycle. The filling process may be started in the mold closing process. The ejection step may be started in the mold opening step. When an opening/closing valve for opening/closing the flow path of the nozzle 320 is provided, the mold opening process may be started in the metering process. Even if the mold opening process is started in the metering process, the molding material does not leak from the nozzle 320 as long as the opening/closing valve closes the flow path of the nozzle 320.

The one-shot molding cycle may include steps other than the metering step, the mold closing step, the pressure increasing step, the mold closing step, the filling step, the pressure maintaining step, the cooling step, the pressure releasing step, the mold opening step, and the ejection step.

For example, the pre-metering suck-back step of retracting the screw 330 to a preset metering start position may be performed after the end of the pressure maintaining step and before the start of the metering step. The pressure of the molding material stored in front of the screw 330 can be reduced before the start of the metering process, and the screw 330 can be prevented from rapidly backing up when the metering process is started.

After the completion of the metering step and before the start of the filling step, the post-metering suck-back step of retracting the screw 330 to a preset filling start position (also referred to as "injection start position") may be performed. The pressure of the molding material stored in front of the screw 330 can be reduced before the start of the filling process, and leakage of the molding material from the nozzle 320 can be prevented before the start of the filling process.

The control device 700 is connected to an operation device 750 that receives an input operation from a user and a display device 760 that displays a screen. The operation device 750 and the display device 760 are constituted by, for example, a touch panel 770, and may be integrated. The touch panel 770 as the display device 760 displays a screen under the control of the control device 700. Information such as the setting of the injection molding machine 10, the current state of the injection molding machine 10, and the like may be displayed on the screen of the touch panel 770. Further, an operation unit such as a button or an input field for receiving an input operation by a user may be displayed on the screen of the touch panel 770. The touch panel 770 as the operation device 750 detects an input operation of a user on a screen, and outputs a signal corresponding to the input operation to the control device 700. Thus, for example, the user can perform setting (including input of a set value) of the injection molding machine 10 by operating the operation unit provided on the screen while checking information displayed on the screen. The user can operate the operation unit provided on the screen, and thereby operate the injection molding machine 10 corresponding to the operation unit. The operation of the injection molding machine 10 may be, for example, the operations (including stopping) of the mold clamping device 100, the ejector 200, the injection device 300, the moving device 400, and the like. The operation of the injection molding machine 10 may be, for example, switching of a screen displayed on the touch panel 770 as the display device 760.

The operation device 750 and the display device 760 according to the present embodiment are integrated into the touch panel 770, but may be provided independently. Further, a plurality of operation devices 750 may be provided. The operation device 750 and the display device 760 are disposed on the operation side (Y-axis negative direction) of the mold clamping device 100 (more specifically, the stationary platen 110).

(details of the control device)

An example of a feedback control system will be described with reference to fig. 3. The injection molding machine 10 includes, for example, a motor 20, a driven portion 30 driven by the motor 20, an encoder 40 that detects rotation of the motor 20 and outputs a detection signal, and a control device 70 that controls the motor 20 based on the detection signal from the encoder 40. The motor 20 is an example of a driving unit. The encoder 40 is an example of a detector that detects the driving condition of the driven portion 30.

Fig. 4 illustrates a combination of the motor 20, the driven portion 30, and the encoder 40. The combination of example 1 includes a metering motor 340, a screw 330, and a metering motor encoder 341. The combination of example 2 includes an injection motor 350, a screw 330, and an injection motor encoder 351. The combination of example 3 includes a clamp motor 160, a crosshead 151, and a clamp motor encoder 161. Although not shown, the movable platen 120 may be used instead of the cross head 151. The combination of example 4 includes an ejector motor, ejector rod 210, and ejector motor encoder.

The encoder 40 detects the rotation speed or the rotation amount of the output shaft of the motor 20. The detection signal from the encoder 40 is input to the control device 70 via the interface circuit 80. The control device 70 corresponds to the control device 700 shown in fig. 1 and 2. The control device 70 controls the motor 20 via the inverter 90. Inverter 90 supplies an alternating current to motor 20.

The encoder 40 has a 1 st memory 41. The 1 st memory 41 is, for example, a part of a single chip microcomputer. The 1 st memory 41 stores, for example, detector information of the encoder 40, magnetic pole position information of the motor 20, and origin position information of the motor 20. The detector information of the encoder 40 is written in the 1 st memory 41 before the encoder 40 is mounted on the motor 20. On the other hand, although details will be described later, the magnetic pole position information of the motor 20 and the origin position information of the motor 20 are written in the 1 st memory 41 after the encoder 40 is mounted on the motor 20.

The detector information of the encoder 40 includes, for example, "model number", "serial number", and "version number". Whether or not the encoder 40 of the standard model is mounted can be grasped from the "model". Even if the "model" is the same, the software stored in the control device 70 may be updated for improvement of the detection method or the like. In this case, if the "serial number" or "version number" is stored, the software optimal for the encoder 40 can be stored in the control device 70.

The magnetic pole position information of the motor 20 is used to drive the motor 20. As shown in fig. 5, the magnetic pole position of the motor 20 is, for example, a magnetic pole position (for example, an N-pole position) of the rotor 22 of the motor 20 with respect to a reference point (for example, U-phase) of the stator 21 of the motor 20. The magnetic pole position is the magnet position. By grasping the magnetic pole position of the motor 20, a current of an appropriate phase can be supplied to the motor 20, and the motor 20 can be appropriately driven, so that malfunction of the motor 20 can be prevented. In particular, when the motor 20 is a synchronous motor, it is important to grasp the magnetic pole position of the motor 20.

The origin position information of the motor 20 is used to control the position of the driven portion 30. When the driven portion 30 is the screw 330, for example, a mechanical advance limit position of the screw 330 is used as an origin position of the motor 20. The current position of the screw 330 can be grasped by detecting the rotation amount of the motor 20 from the origin position of the motor 20 by the encoder 40. By grasping the position of the screw 330, malfunction of the screw 330 can be prevented.

The 1 st memory 41 may store molding machine information. The molding machine information is information for identifying the injection molding machine 10. Typically, a plurality of injection molding machines 10 are provided in one factory. In this case, it is preferable to monitor a plurality of injection molding machines 10 in a centralized manner. To centrally monitor multiple injection molding machines 10, molding machine information is used to identify multiple injection molding machines 10. The molding machine information is stored in the 1 st memory 41 together with the magnetic pole position information and the origin position information after the encoder 40 is mounted on the motor 20.

The data writing to the 1 st memory 41 can be performed by a known technique, but in the present embodiment, the data writing is performed using the control device 70 and the operation device 750 (see fig. 1 and 2). The control device 70 writes the molding machine information and the like in the 1 st memory 41 in response to an input to the operation device 750. The control device 70 performs not only data writing to the 1 st memory 41 but also data reading from the 1 st memory 41. Therefore, the control device 70 is connected to the 1 st memory 41 through the dedicated line 50. In addition, the dedicated line 50 may not be used, and data writing and data reading may be performed via the interface circuit 80.

The molding machine information includes, for example, "equipment number" assigned to each injection molding machine 10 and "installation position" of the encoder 40 in the injection molding machine 10. The "equipment number" is a number inherent to each injection molding machine 10. Since the same device number does not exist, individual discrimination can be reliably performed. The "equipment number" may also include the serial name of the injection molding machine 10. When a plurality of encoders of the same model are used in one injection molding machine, the "set position" is used to discriminate them. The "installation position" may be entered by a symbol such as "RT", "IJ", "MD" or "EJ". "RT" indicates that "set position" is metering motor 340, "IJ" indicates that "set position" is injection motor 350, "MD" indicates that "set position" is clamp motor 160, "EJ" indicates that "set position" is ejection motor.

The molding machine information may include "plasticizing capacity" and "mold clamping capacity". A disorder (data corruption) of information stored in the 1 st memory 41 or the 2 nd memory 71 may occur due to unexpected trouble or the like. By storing "plasticizing capacity" or "mold clamping capacity" as molding machine information, more data can be compared when comparing data in the 1 st memory 41 and the 2 nd memory 71.

The control device 70 has a 2 nd memory 71. The 2 nd memory 71 stores information common to the 1 st memory 41. For example, the 2 nd memory 71 stores detector information, magnetic pole position information, origin position information, and molding machine information. The molding machine information is stored in the 2 nd memory 71 of the control device 70 at the stage of manufacturing the injection molding machine 10. The detector information, the magnetic pole position information, and the origin position information are stored in the 2 nd memory 71 after the encoder 40 is mounted on the motor 20.

The details will be described later, but the control device 70 compares common information (for example, detector information, magnetic pole position information, origin position information, and molding machine information) stored in the 1 st memory 41 and the 2 nd memory 71 when the power of the injection molding machine 10 is turned on. When the common information is not identical, at least one of the encoder 40 and the control device 70 has erroneous information.

When the common information is not identical, the control device 70 limits the driving of the motor 20. Limiting the drive of the motor 20 includes, for example, limiting the output of the motor 20 so that at least one of the speed (e.g., rotational speed), thrust (e.g., torque), and supply current of the motor 20 exceeds a threshold. The threshold value is set so that, for example, even if malfunction occurs, the components (for example, the driven portion 30) of the injection molding machine 10 are not damaged.

As described above, when the common information is not identical, the control device 70 restricts the driving of the motor 20. This can suppress malfunction based on the error information, and can reduce the influence due to the malfunction. The control device 70 preferably restricts the driving of the motor 20 until the common information is identical, and releases the restriction of the driving of the motor 20 if the common information is identical.

Next, an example of the processing of the control device 70 will be described with reference to fig. 6 to 10. The process shown in fig. 6 is performed when the power of the injection molding machine 10 is turned on. First, the control device 70 compares the common information stored in the 1 st memory 41 and the 2 nd memory 71, and determines whether or not the common information matches (step S101). The common information to be compared includes, for example, detector information, magnetic pole position information, origin position information, and molding machine information.

As shown in fig. 7, the common information is generally identical (step S101, "yes"). At this time, the control device 70 normally starts the injection molding machine 10 (step S102). When the injection molding machine 10 is normally started, the driving of the motor 20 is not limited and molded articles can be manufactured. When the driving of the motor 20 is not limited, the driving of the motor 20 is performed according to a preset set value.

As shown in fig. 8, when the injection molding machine 10 is newly manufactured or both the encoder 40 and the control device 70 are replaced, only the detector information is written in the 1 st memory 41, and only the molding machine information is written in the 2 nd memory 71. At this time, all of the detector information, the magnetic pole position information, the origin position information, and the molding machine information are inconsistent.

As shown in fig. 9, when only the encoder 40 is replaced without replacing the control device 70, only the detector information is written in the 1 st memory 41. In addition to the molding machine information, the 2 nd memory 71 is written with detector information, magnetic pole position information, and origin position information related to the encoder 40 before replacement. At this time, all of the detector information, the magnetic pole position information, the origin position information, and the molding machine information are inconsistent.

As shown in fig. 10, when only the control device 70 is replaced without replacing the encoder 40, the detector information, the magnetic pole position information, the origin position information, and the molding machine information are written in the 1 st memory 41. These pieces of information are pieces of information that need not be updated. On the other hand, molding machine information is written in the 2 nd memory 71. In the 1 st memory 41 and the 2 nd memory 71, the detector information, the magnetic pole position information, and the origin position information do not match, but only the molding machine information matches.

As is clear from fig. 8 to 10, when the encoder 40 is replaced, only when the control device 70 is replaced, and when the encoder is newly manufactured or replaced, it can be determined whether or not each information is written in the 1 st memory 41 and the 2 nd memory 71.

If the common information does not match (no in step S101), at least one of the encoder 40 and the control device 70 has erroneous information. At this time, control device 70 restricts driving of motor 20 (step S103). This can suppress malfunction based on the error information, and can reduce the influence of the malfunction.

Next, the control device 70 determines whether adjustment of the motor 20 is required (step S104). The adjustment of the motor 20 includes, for example, origin position detection of the motor 20 and magnetic pole position detection of the motor 20. Adjustment of the motor 20 is required when the injection molding machine 10 is newly manufactured (see fig. 8), when the encoder 40 and the control device 70 are simultaneously replaced (see fig. 8), and when only the encoder 40 is replaced (see fig. 9).

When only the control device 70 is replaced (refer to fig. 10), no adjustment of the motor 20 is required. This is because the magnetic pole position information and origin position information written in the 1 st memory 41 need not be updated. In addition, when a disorder (data corruption) occurs in information other than the magnetic pole position information and the origin position information, adjustment of the motor 20 is not required.

When adjustment of the motor 20 is not necessary (no in step S104), the control device 70 updates data of at least one of the 1 st memory 41 and the 2 nd memory 71 (step S106). For example, when only the control device 70 is replaced (refer to fig. 10), the control device 70 reads the detector information, the magnetic pole position information, and the origin position information from the 1 st memory 41 and writes them in the 2 nd memory 71. When a scramble occurs, correct data is read from one of the memories (for example, the 1 st memory 41), and incorrect data stored in the other memory (for example, the 2 nd memory 71) is rewritten with the correct data.

On the other hand, when adjustment of the motor 20 is necessary (yes in step S104), the control device 70 issues a notification prompting the operator to adjust the motor 20 via the display device 760 or the like. Then, the control device 70 adjusts the motor 20 according to the input operation of the operator in the operation device 750 (step S105). As described above, the adjustment of the motor 20 includes, for example, the detection of the magnetic pole position of the motor 20 and the detection of the origin position of the motor 20.

As shown in fig. 5, in the magnetic pole position detection of the motor 20, the control device 70 supplies a current (i.e., a dc current) fixed to a predetermined phase to the U-phase, the V-phase, and the W-phase. The phases differ by, for example, 120 °. The rotor 22 is rotated and stopped by the supply of the direct current so that the magnetic pole position (for example, N-pole position) of the rotor 22 coincides with the reference point (for example, U-phase) of the stator 21. In this state, the control device 70 detects the rotation angle of the output shaft of the motor 20 through the encoder 40, thereby detecting the magnetic pole position of the motor 20.

Although not shown, in the origin position detection of the motor 20, the control device 70 moves the driven portion 30 (for example, the screw 330) to a mechanical movement limit (for example, a forward limit position) by the motor 20. The movement limit is determined by, for example, a stroke of a motion conversion mechanism such as a ball screw. The motion conversion mechanism converts the rotational motion of the motor 20 into linear motion of the driven portion 30. The movement limit may be, for example, a position where the screw 330 abuts against the nozzle 320. In this state, the control device 70 detects the rotation angle of the output shaft of the motor 20 by the encoder 40, thereby detecting the origin position of the motor 20.

The detection of the magnetic pole position of the motor 20 and the detection of the origin position of the motor 20 are performed in a state where the driving of the motor 20 is restricted, for example, in a state where the supply current to the motor 20 is restricted to be equal to or less than a threshold value (for example, equal to or less than 20% of the maximum current). This can suppress malfunction.

The detection of the magnetic pole position of the motor 20 is performed prior to the detection of the origin position of the motor 20. This is because, by grasping the magnetic pole position of the motor 20, it is possible to supply a current of an appropriate phase to the motor 20 and to appropriately drive the motor 20.

Then, the operator inputs the origin position and the magnetic pole position detected in step S105 to the operation device 750. Next, the control device 70 writes the origin position and the magnetic pole position detected in step S105 in the 1 st memory 41 and the 2 nd memory 71 according to the input operation of the operator, and updates the data in the 1 st memory 41 and the 2 nd memory 71 (step S106).

In addition, the operator may input the origin position or the magnetic pole position without using a numerical value. When the origin position or the magnetic pole position is detected, the control device 70 may automatically (or according to a button operation by an operator) write the origin position or the magnetic pole position in the 1 st memory 41 and the 2 nd memory 71.

In step S106, information other than the magnetic pole position information and the origin position information may be updated. For example, when the injection molding machine 10 is newly manufactured (refer to fig. 8), when the encoder 40 and the control device 70 are simultaneously replaced (refer to fig. 8), and when only the encoder 40 is replaced (refer to fig. 9), the control device 70 reads the detector information from the 1 st memory 41 and writes it in the 2 nd memory 71, and reads the molding machine information from the 2 nd memory 71 and writes it in the 1 st memory 41.

After step S106, control device 70 compares the common information stored in 1 st memory 41 and 2 nd memory 71 again, and determines whether or not the common information matches (step S107). Since the data update implementation is completed, the common information is generally consistent. However, if communication interference or the like occurs during data update, the common information does not match.

When the common information does not match (no in step S107), the control device 70 again executes the processing of step S103 and subsequent steps. On the other hand, when the common information matches (yes in step S107), control device 70 releases the restriction of the drive of motor 20 (step S108), and starts injection molding machine 10 normally (step S102).

According to the present embodiment, the encoder 40 has the 1 st memory 41, and the control device 70 has the 2 nd memory 71. The 1 st memory 41 and the 2 nd memory 71 store common information. Thus, when at least one of the encoder 40 and the control device 70 is replaced, the common information can be compared or rewritten.

Further, according to the present embodiment, when the power supply of the injection molding machine 10 is turned on, the common information is compared, and if the common information does not match, the driving of the motor 20 is restricted. In this state, the magnetic pole position is detected, the magnetic pole position is adjusted, or the like. By restricting the driving of the motor 20, malfunction can be suppressed.

In addition, according to the present embodiment, when only the control device 70 is replaced without replacing the encoder 40, magnetic pole position information and the like are written in the 1 st memory 41. This information is information that does not need to be updated, and is read from the 1 st memory 41 and written to the 2 nd memory 71. Thus, detection of the magnetic pole position or the like is not required, and maintenance becomes easy.

The embodiments of the injection molding machine according to the present invention have been described above, but the present invention is not limited to the above embodiments and the like. Various changes, modifications, substitutions, additions, deletions and combinations can be made within the scope described in the claims. These are, of course, within the technical scope of the present invention.

Claims (4)

1. An injection molding machine is provided with:

a driving section;

a driven part driven by the driving part;

a detector provided in the driving unit, for detecting a driving state of the driven unit and outputting a detection signal; and

A control device for receiving the detection signal and controlling the driving of the driving part,

the detector has a 1 st memory, the control device has a 2 nd memory storing information common to the 1 st memory,

when the common information is not identical in the 1 st memory and the 2 nd memory, the control device restricts driving of the driving unit.

2. The injection molding machine according to claim 1, wherein,

the driving part includes a motor, the detector includes an encoder that detects rotation of the motor,

the common information includes a magnetic pole position of the motor.

3. The injection molding machine according to claim 1 or 2, wherein,

the driving part comprises a motor and is provided with a driving part,

when the common information is not identical in the 1 st memory and the 2 nd memory, the control device detects the magnetic pole position of the motor or adjusts the magnetic pole position of the motor.

4. The injection molding machine according to claim 1 or 2, wherein,

the driving part comprises a motor and is provided with a driving part,

when the common information is not identical in the 1 st memory and the 2 nd memory, the control device notifies the operator to adjust the magnetic pole position of the motor.