JP2017213839A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of securely recovering an injection material by a relatively simple constitution.SOLUTION: There is provided an injection molding machine, comprising: an injection cylinder for injecting a molding material; a fixation side platen to be fixed with the injection cylinder; a die holder mounted with a die molding the injection material injected from the injection cylinder into a prescribed shape; a die closing means energizing the die holder to the side of the fixation side platen and performing die closing; a pan arranged freely attachably between the confronted fixation side platen and the die holder and receiving the injection material injected from the injection cylinder at a prescribed position; a detection means for detecting whether the pan is arranged at the prescribed position or not; and a guiding means for guiding the pan between the fixation side platen and the die holder to the prescribed position.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an injection molding machine that injects a molding material.

  The injection molding machine is basically composed of an injection mechanism that kneads molten resin and injects it into a mold, and a mold clamping mechanism that can hold the mold fixed to the injection-molded part. As prepared. The injection mechanism section has an injection cylinder for heating and melting the resin inside. When replacing or discarding the molten resin in the injection cylinder, an operation called purging is performed. The remaining resin is discharged. In order to prevent the resin discharged by the purging from being scattered and to collect the resin, a purge tray is installed near the nozzle (see Patent Document 1).

Japanese Patent Laid-Open No. 8-300407

  In the above-mentioned Patent Document 1, a mechanism for collecting the purged resin is operated by a command from the molding machine, which requires a power source such as a motor, a slide mechanism for moving the tray, and the like, which is expensive. It is also necessary to secure the installation location. Therefore, the configuration is not suitable for a small injection molding machine.

  In the vertical injection molding machine, the purged resin is discharged into the mold opening / closing mechanism, so if the mold closing operation is performed as it is, the purged resin is sandwiched together with the tray, and the mold or There is a possibility of damaging the molding machine.

  The present invention provides a technique capable of reliably recovering an injection material with a relatively simple configuration.

  An injection molding machine according to the present invention includes an injection cylinder that injects a molding material, a fixed side platen to which the injection cylinder is fixed, and an injection material that is disposed to face the fixed side platen and is injected from the injection cylinder. Between a mold holder to which a mold to be molded into a predetermined shape is mounted, mold clamping means for urging the mold holder toward the fixed platen side and clamping the mold, and between the opposed fixed platen and the mold holder A receiving tray that is removably disposed on the receiving cylinder and receives the injection material injected from the injection cylinder at a predetermined position; detection means for detecting whether the receiving tray is disposed at the predetermined position; the fixed platen; Guidance means for guiding the tray until reaching the predetermined position between the mold holders.

  The present invention can realize an injection molding machine capable of reliably recovering an injection material with a relatively simple configuration.

The figure which partially fractured and showed the whole structure of the injection molding machine which concerns on one Embodiment of this invention. Sectional drawing which shows the internal structure of the principal part in the injection molding machine of FIG. Schematic which shows the saucer of the injection material in the injection molding machine of FIG. 1, and its periphery. The block diagram explaining the function of the injection molding machine of FIG. The flowchart figure which shows the purging process in the injection molding machine of FIG. The flowchart figure which shows the mold clamping process in the injection molding machine of FIG.

  Hereinafter, an embodiment of an injection molding machine according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a partially cutaway view showing the overall configuration of the injection molding machine in the present embodiment, and FIG. 2 shows the internal structure around the injection apparatus and the mold.

  The injection molding machine in the present embodiment plasticizes a resin material and injects the resin material into a cavity 2 in a mold formed between the fixed side mold plate 3a and the movable side mold plate 3b (material injection). Apparatus), a mold 3 (fixed side mold plate 3a and movable side mold plate 3b), and a mold clamping device.

  The injection apparatus according to the present embodiment includes a material supply unit that supplies a resin material (injection material) that is a raw material to be injected into the heating cylinder, and a plasticization injection unit that plasticizes and injects the resin material. In the material supply unit, the resin from the hopper that stores the resin material is supplied from the material supply port 24 to the resin supply path 22, and further, the feeder pin that slides in the resin supply path 22 by driving the material supply motor 25. 34 is sent to the heating cylinder 13 of the plasticizing injection part.

  The heating cylinder unit constituting the plasticizing injection unit includes a heating cylinder 13, tobeads 12a and 12b, an injection nozzle 10, lock nuts 14a and 14b, a band heater 16, a nozzle heater 15, a cylinder thermocouple 18, and a nozzle thermocouple 17. ing.

  The heating cylinder unit is attached so that the resin passage 20 and the resin supply passage 22 of the jacket 21 communicate with each other in a state in which the plunger 19 is fitted to the heating cylinder 13, and is pressed against the jacket 21 by the fixing member 23. Fixed.

  The plasticizing injection unit includes a plunger 19 slidably fitted to the heating cylinder 13 and a plunger driving unit for reciprocatingly driving the plunger 19. An injection nozzle 10 is formed at the tip of the heating cylinder 13 whose outer periphery is surrounded by the band heater 16.

  The plunger drive unit includes an injection motor 28, an injection ball nut 26a that is rotatably supported, and a ball screw shaft 26b that is screwed to the injection ball nut 26a. A driving sprocket is integrally connected to the injection motor 28, and an endless timing belt 27 is stretched between the driving sprocket and a driven sprocket provided integrally with the injection ball nut 26a.

  Therefore, the rotation of the injection motor 28 can be transmitted to the injection ball nut 26 a by the timing belt 27, and the plunger 19 connected to the ball screw shaft 26 b can be reciprocated in the heating cylinder 13.

  In addition, the heating cylinder 13 is connected to the jacket 21, and the upper portion of the heating cylinder 13 has a structure having a male screw part 42, and is fastened by lock nuts 14 a and 14 b whose inner surfaces have a female screw structure. Yes.

  Several nut holes (not shown) are provided on the side surfaces of the lock nuts 14a and 14b so that a rod-shaped one can be inserted and rotated easily. A wave spring 43 is sandwiched between the jacket 21 and the heating cylinder 13.

  With such a configuration, the heating cylinder 13 and the injection nozzle 10 can adjust their positions relative to the stationary platen 7 by rotating the lock nuts 14a and 14b.

  The mold clamping device in this embodiment includes an intermediate plate 6 to which the fixed side mold plate 3a is attached, a movable side platen 5 to which the movable side mold plate 3b facing the fixed side mold plate 3a is attached, and a mold driving unit. Have.

  A spool runner 1 is formed on the fixed-side template 3a, and a molded product-shaped cavity 2 is formed between the fixed-side template 3a and the movable-side template 3b. The cylindrical groove 37 (see FIG. 3, space portion) of the spool runner 1 serves as an escape for preventing interference with the fixed-side template 3a when the heating cylinder 13 is moved and adjusted as described above.

  The mold drive unit according to the present embodiment includes a mold clamping motor 29, a ball screw 30 for converting the rotational power of the mold clamping motor 29 to linear drive, and a gap between the ball screw 30 and the movable platen 5. And a toggle mechanism having two link arms 31 and 32 that are connected to drive the movable platen 5. The mold driving unit constitutes a mold clamping unit that generates a mold clamping force.

  A tie bar 36 slidably passes through the movable platen 5 and the intermediate plate 6, and is driven between a forward end that is a mold clamping position and a reverse end that is in a mold open state by driving a mold clamping motor 29. Can be reciprocated along the tie bar 36.

  When the mold clamping is completed, the movable platen 5 and the movable mold plate 3b are pressed against the fixed platen 7 with the intermediate plate 6 that fixes the fixed mold plate 3a interposed therebetween.

  Reference numeral 8 denotes a runner lock member, which is driven by a runner discharge drive unit 9 including a small motor to enter and exit the mold in a direction substantially perpendicular to the opening and closing direction of the mold to hold and discharge the runner.

  In the mold-clamping state of FIG. 2, it is a part of the contact surface with the fixed-side platen 7 in a state of being fitted into the runner lock member fitting groove formed in the intermediate plate 6 and the fixed-side mold plate 3a. The mold can be opened and closed without any problems.

  In the above-described configuration, after the mold clamping is completed, the resin (molten material) injected from the nozzle 10 passes through the spool runner 1 formed on the fixed-side mold plate 3a, and the fixed-side mold plate 3a and the movable-side mold plate 3b. Are filled into the cavity 2 formed, and a molded product is molded.

  After cooling the molded product, the mold clamping motor 29 is reversely rotated, and the movable platen 5 is lowered to perform mold opening. In the mold opening operation, the intermediate plate 6 and the movable platen 5 are separated from the fixed platen 7, and the intermediate plate 6 is retracted to a predetermined position and stopped, and the movable platen 5 is separated from the intermediate plate 6. In addition, the movable platen 5 and the intermediate plate 6 constitute, for example, a mold holder in which a mold is mounted and holds the mold in this embodiment.

  As the intermediate plate 6 is lowered, the spool runner 1 is separated from the nozzle 10 and the fixed-side template 3a and is fixed to the runner lock member 8. The runner lock member 8 is driven rightward in FIG. 1 by driving the runner discharge drive unit 9 to discharge the spool runner 1 out of the molding machine.

  As the movable platen 5 is lowered, the molded product is ejected from the movable mold plate 3b by the ejector pins 44 of the ejector mechanism 38 incorporated in the movable platen 5.

  Here, the mechanism and operation related to the purge tray 100, which is a characteristic part of the present embodiment, will be described.

  When purging, the mold clamping motor 29 is driven to a sufficient position so that the fixed platen (nozzle plate) 7 and the mold 3 (fixed side mold plate 3a) do not contact each other, and the movable platen 5 is lowered. Then, the purge tray 100 is installed in the space between the stationary platen 7 and the mold 3.

  Next, the injection unit including the injection nozzle 10 is heated, and the resin melted inside the injection unit 10 is discharged from the tip of the injection nozzle 10 to the purge tray 100 installed at the upper part of the mold 3 by the injection motor 20 ( Injection).

  Next, FIG. 3 shows a view of the installation state of the purge tray 100 in the present embodiment as viewed from above the molding machine. A guide means for the purge tray 100 for installing the purge tray 100 at a predetermined position (for example, a mounting position of the tray that can reliably receive the purged injection material) will be described.

  The purge tray 100 is installed at a predetermined position in such a manner as to be guided by the front, rear, left and right tie bars 36 and the intermediate plate 6. In order to guide more accurately, a guide mechanism such as a guide bush or a guide post may be used. That is, for example, in this embodiment, the diver 36 constitutes a guide member (guide member) that serves as a means for guiding the purge tray 100 to a predetermined position. However, the present invention is not limited to this. For example, the purge tray 100 may be guided by installing a member other than the diver 36 or by providing a guiding structure on another member.

  Next, a mechanism in which the purge tray 100 is interlocked and guided to a predetermined position by the operation of closing the safety door 150 will be described. The safety door 150 is configured to close by applying a force in the direction of the arrow. When the safety door 150 is completely closed, it comes into contact with the purge tray 100 and is pushed into a predetermined position.

  Thus, by closing the safety door 150, the purge tray 100 can be installed at a predetermined position. In order to install the purge tray 100 at the correct position, a receiver may be installed on the safety door side, or the shape of the safety door 150 itself may be changed.

  Next, a detection means for detecting the purge tray 100 will be described. A front sensor 114 and a rear sensor 115 are installed in the molding machine. The front sensor 114 is turned on when the purge tray 100 is installed. The rear sensor 115 is turned on when the purge tray 100 is installed at a predetermined position. The front sensor 114 or the rear sensor 115 is an example of a detecting unit that detects whether or not the purge tray 100 is installed at a predetermined position. An optical sensor or a detection method using a mechanical lever or the like may be used.

  If the rear sensor 115 is OFF and the front sensor 114 is ON, it means that the purge tray 100 is not installed at the correct position. If purging is performed in this state, the discharged resin may be scattered outside the purge tray 100. In such a case, the injection operation in the purging process is limited.

  In addition, when either or both of the front sensor 114 and the rear sensor 115 are ON, the purge tray 100 or the resin discharged by purging is a space between the nozzle plate 5 and the cassette type fixed side template 10. In such a case, the mold closing operation is limited.

  The front sensor 114 or the rear sensor 115 may use other detection means such as a mechanical switch. Further, if the purge tray 100 is not inserted correctly, the safety door will not be closed, or if the safety area sensor is shielded, the operation of the molding machine itself will be restricted, and the front sensor 114 will be omitted. It is also possible.

  Further, the rear sensor 115 can be shared with a runner discharge detection sensor used in the molding process.

  Next, FIG. 4 is a circuit block diagram of the injection molding machine in the present embodiment.

  In FIG. 4, a control device 100 for driving and controlling the injection molding machine includes an arithmetic processing CPU 105 serving as a control means, a ROM 102 for storing a control program and calculation data for the injection molding machine, and a temporary storage for the control program and calculation data. RAM 103 to be used, E2PRM 101 for storing each molding condition and molding frequency, servo amplifier 107 for driving servo motors for injection and mold clamping, FPGA 104 for controlling servo amplifier 107, runner holding means 15 and the like are driven. A motor driver 106 for controlling the motor, a band heater 110 for heating the injection cylinder 1, a ring heater 111 for heating the nozzle 4, a temperature sensor 112 for detecting the temperature of the injection cylinder 1, and a temperature of the nozzle 4 are detected. Temperature sensor 113 for the operator LCD108 having a touch panel function of the display device and the operation means for performing interface, and a switch 109 as an auxiliary operating means.

  In addition, the front sensor 114 and the rear sensor 115 for detecting the purge pan, which are characteristic portions of the present embodiment, are also connected to the FPGA 104. You may connect directly to CPU105.

  In the above configuration, the control apparatus 100 displays a menu screen or the like (not shown) on the LCD 108, and performs setting of molding conditions, purge operation, and molding operation. Since the molding conditions are appropriately adjusted depending on the material to be molded, the E2PROM 101 is configured to store the molding conditions. In this embodiment, microcomputer control is used, but other control means such as a sequencer may be used.

  Next, FIG. 5 is a flowchart at the start of the purging process of the injection molding machine in the present embodiment.

  The operation of the purging process, which is a characteristic part of this embodiment, will be described. When the operator performs a purging start command and a purging start command is issued (step S501), it is confirmed whether the front sensor 114 is ON (step S502).

  If it is OFF in step S502, it is considered that the purge tray 100 is not installed, and the process ends in error (S505).

  On the other hand, if it is ON in step S502, it is next checked whether the rear sensor 115 is ON (S503).

  If it is OFF in step S503, it is assumed that the purge tray 100 is not installed at the correct position, and the process ends in error (S505).

  If ON in step S503, purging is started (S504). Although the injection operation in the purging process has been described here, the same flow is performed for the injection operation in the manual operation.

  Next, FIG. 6 is a flowchart at the start of mold closing of the injection molding machine according to the present embodiment.

  Similarly, a mold closing operation which is a characteristic part of the present embodiment will be described. When the operator performs a mold closing start operation and a mold closing start command is issued (S601), it is confirmed whether the front sensor 114 is OFF (S602).

  Here, if it is ON in step S602, it is considered that the purge tray 100 remains in the molding machine, and the process ends in error (S605).

  On the other hand, if it is OFF in step S602, it is further confirmed whether the rear sensor 115 is also OFF (S603).

  If ON in step S603, the purge pan 100 is similarly regarded as remaining in the molding machine, and the process ends in error (S605).

  On the other hand, if it is OFF in step S603, mold closing is started (S604). Here, the mold closing operation in the manual operation has been described, but the same flow is performed for the mold closing operation in the molding operation.

  Further, since the purge tray 100 is not sandwiched from the mold opening position to the position where the movable platen 5 and the intermediate plate 6 are in contact with each other, the mold closing operation can always be performed.

  In addition, the present invention should be construed only from the matters described in the scope of the claims, and in the above-described embodiments, all the changes and modifications included in the concept of the present invention are other than those described. Is possible. That is, the matters in the above-described embodiments are not intended to limit the present invention, and can be arbitrarily changed according to the use and purpose, including configurations that are not directly related to the present invention.

  For example, according to the present invention, the apparatus includes a detecting unit that detects the presence or absence of a resin tray discharged by purging, and a guiding unit that guides the tray to a detection range of the detecting unit. In the case where the mold cannot be detected, the injection operation in the mold opening state is limited, and in the case where the tray is detected, the mold closing operation is limited.

  Further, the guiding means can be interlocked with an opening / closing operation of a safety door of the injection molding machine (opening / closing door of the mold mounting portion), and when the tray is not installed at a predetermined position, the safety device of the molding machine works. The operation of the molding machine can also be restricted, and the detection means can be used in common with the detection means for detecting the discharge of the runner in the molding process. It is possible to provide an injection molding machine that prevents scattering of the resin discarded in step 1 and prevents the resin and the tray from being caught.

  In the present invention, the detection unit includes: a detection unit that detects presence / absence of a tray of resin (injected material) discharged (injected) by purging; and a guide unit that guides the tray to a detection range of the detection unit. If the tray is not detected by the means, the injection operation in the mold open state may be limited, and if the tray is detected, the mold closing operation may be limited.

  Further, the guiding means can be interlocked with the opening / closing operation of the safety door of the injection molding machine, and when the tray is not installed at a predetermined position, the molding machine safety device works to limit the operation of the molding machine. The detection means can also be shared with the detection means for detecting the discharge of the runner in the molding process, thereby preventing scattering of the resin discarded by purging with an inexpensive and space-saving arrangement. In addition, it is possible to provide an injection molding machine that prevents the resin and the tray from being caught.

Claims (4)

An injection cylinder for injecting molding material;
A stationary platen to which the injection cylinder is fixed;
A mold holder that is disposed opposite to the fixed-side platen and is mounted with a mold that molds an injection material injected from the injection cylinder into a predetermined shape;
Mold clamping means for urging the mold holder toward the stationary platen and clamping the mold;
A tray that is removably disposed between the fixed platen and the mold holder facing each other, and that receives the injection material injected from the injection cylinder at a predetermined position;
Detecting means for detecting whether or not the tray is disposed at the predetermined position;
An injection molding machine comprising: guide means for guiding the tray until reaching the predetermined position between the fixed platen and the mold holder.   2. The injection molding machine according to claim 1, wherein an injection operation from the injection cylinder is limited until the detection unit detects that the tray is disposed at the predetermined position.   3. The injection molding machine according to claim 1, wherein when the detecting unit detects that the tray is disposed at the predetermined position, the mold clamping operation of the mold clamping unit is limited.   2. A safety door that opens and closes a mounting portion for mounting the mold on the mold holder, and the saucer is pressed toward the predetermined position by the safety door that is closed. 4. The injection molding machine according to any one of items 1 to 3.

Images