JP5412084B2 - Molding machine - Google Patents

Description

  The present invention relates to a molding machine such as an injection molding machine and a die casting machine, and more particularly to a centering means for a fixed mold and a movable mold mounted on a molding machine body.

  The fixed side mold and the movable side mold mounted on the molding machine main body start molding work in order to obtain high-quality molded products and to prevent the mold from being destroyed by preventing interference between the molds. Previously, it is necessary to center with high accuracy. Conventionally, as a mold centering means in a molding machine, one of a fixed side mold and a movable side mold is attached to a temporary clamp device provided with a resilient member, and a convex formed on the opposing surface of each mold. It is known that both the mold and the recess are fitted to the enamel to perform centering of both molds, and thereafter, the mold attached to the temporary clamping device is fully clamped (see, for example, Patent Document 1). ). Further, as another example, an X− that can adjust the position of the movable die in the XY direction in a plane perpendicular to the advancing / retreating direction between the movable die plate and the movable die attached to the movable die plate. A device provided with a Y feed mechanism is also known (for example, see Patent Document 2).

The molding machine is provided with a plurality of fixed molds corresponding to a plurality of movable molds mounted on the rotary table, and a plurality of molds corresponding to each pair of the movable molds and the fixed molds. There is a so-called multicolor molding machine provided with an injection unit (for example, see Patent Document 3). Also for this multicolor molding machine, it is necessary to center each movable mold and fixed mold.
JP-A-5-245903 JP 2008-246783 A JP 2008-55625 A

  However, since the centering means for the fixed side mold and the movable side mold described in Patent Documents 1 and 2 are equipped with special equipment for centering that is not directly related to the production of the molded product, the cost of the molding machine is increased. There is a problem of doing. Such inconvenience is particularly noticeable in a multicolor molding machine having a plurality of pairs of movable side molds and fixed side molds.

  The present invention has been made in view of the problems of the prior art, and its object is to easily center the fixed side mold and the movable side mold without providing any special equipment. An object of the present invention is to provide a molding machine capable of performing with high accuracy.

In order to achieve this object, the present invention achieves a mold thickness adjusting mechanism for adjusting a setting position of a tail stock with respect to a fixed die plate by rotationally driving a mold thickness adjusting motor, and a mold clamping servo motor. By rotating and driving the movable die plate relative to the fixed die plate, a fixed mold fixed to the fixed die plate by a mold mounting bolt, and the mold mounting bolt A movable side mold fixed to the movable die plate, and a controller for controlling the driving of the mold thickness adjusting motor and the mold clamping servo motor, the butted surfaces of the fixed side mold and the movable side mold The centering protrusion and the centering recess for fitting the centering projection are formed opposite to each other, and the controller includes centering of the fixed side mold and the movable side mold. Centering number in performing the work, centering mold opening amount, is set mold thickness retraction amount and mold clamping force during centering is, the controller, when the mold centering mode is activated, the controls the driving of the servo motor for clamping to the rear advancing the movable die plate centering mold opening amount, the type thickness adjusting to proceed back to the tail stock before Symbol type thickness retraction amount After controlling the driving of the motor, the position of the mold clamping servo motor at the time of the centering is obtained while controlling the driving of the servo motor for clamping so that the movable die plate is advanced by the opening amount of the centering mold By controlling the drive of the mold thickness adjusting motor so as to advance the tailstock until the tailstock is set, the setting position of the tailstock capable of generating the mold clamping force at the time of molding is determined. Before the centering mold open And the configuration of repeated driving of the servo motor for clamping to forward and backward the movable die plate.

  According to such a configuration, the centering operation of the fixed side mold and the movable side mold is executed only by controlling the drive of the mold thickness adjusting motor and the mold clamping servo motor, so that it is directly involved in the production of the molded product. There is no need to provide special equipment for centering. In addition, after determining the tailstock setting position, the centering operation is performed by repeating the forward and backward movement of the movable die plate several times, so that the fixed and movable side molds, which are heavy objects, are centered. While being able to perform reliably, the excessive load to the centering protrusion and the centering recessed part can be prevented.

  Secondly, in the molding machine having the above-described configuration, the centering mold opening amount and the mold thickness retraction amount are set such that the sum thereof is smaller than the height of the centering protrusion. I made it.

  According to this configuration, even when the movable die plate is retracted as much as possible during the centering operation, the fitting between the centering protrusion and the centering recess is maintained. Centering can be performed reliably.

  The molding machine of the present invention does not need to be equipped with a special equipment for centering that does not directly relate to the production of a molded product when performing the centering operation of the fixed side mold and the movable side mold. Can be provided at low cost. In addition, after determining the tailstock setting position, the centering operation is performed by repeating the forward and backward movement of the movable die plate several times, so that the fixed and movable side molds, which are heavy objects, are centered. In addition to being able to perform reliably, excessive force does not act on the centering protrusion and the centering recess, and the centering operation can be performed safely and reliably.

  First, a first embodiment of a molding machine according to the present invention will be described with reference to FIGS. The molding machine according to the first embodiment is a so-called single-color molding machine provided with only one pair of molds. FIG. 1 is a main part configuration diagram of the molding machine according to the first embodiment, and FIG. FIG. 3 is a diagram showing a screen configuration during the centering operation displayed on the display device, and FIG. 4 is a flowchart showing the procedure of the centering operation executed by the controller. FIG.

  As shown in FIG. 1, the molding machine of this example has a fixed die plate 2 and a tail stock 3 fixed to each other at a predetermined interval, and both ends fixed to the fixed die plate 2 and the tail stock 3. Four tie bars 4, a movable die plate 5 that is guided by the tie bars 4 to move back and forth between the fixed die plate 2 and the tail stock 3, and a toggle link mechanism 6 that connects the tail stock 3 and the movable die plate 5. A mold clamping servomotor 7 and a mold thickness adjusting motor 8 mounted on the tailstock 3, and a first encoder 9 and a second encoder 10 for detecting the rotation amount and rotation direction of each of the motors 7 and 8; The ball screw mechanism 11 that converts the rotational movement of the mold clamping servomotor 7 into a linear movement and transmits it to the toggle link mechanism 6, the mold clamping servomotor 7 and the mold thickness adjusting mode. 8 mounted on the fixed die plate 2, a controller 13 for controlling the driving of the motor 8, a motor driver 14 for outputting driving signals of the servo motor 7 for mold clamping and the motor 8 for adjusting the mold thickness according to the command signal from the controller 13. In addition, a mold clamping device including a fixed mold 15 and a movable mold 16 mounted on the movable die plate 5 is provided. In addition, about the injection device mounted in a molding machine, since it is not the summary of this invention and is a matter which belongs to well-known, description is abbreviate | omitted.

  One end of each tie bar 4 is fixed to the fixed die plate 2. In addition, a screw is formed at the other end of each tie bar 4, and a mold thickness adjusting nut 20 is screwed into the screw. The mold thickness adjusting nut 20 is attached to the tail stock 3 so as to be rotatable and not movable back and forth, and is connected to a large gear (not shown) driven by the mold thickness adjusting motor 8. Therefore, when the mold thickness adjusting motor 8 is rotationally driven, the mold thickness adjusting nut 20 is rotationally driven through a large gear (not shown), and the tailstock 3 can be moved in the front-rear direction.

  As shown in FIG. 1, the toggle link mechanism 6 includes a B link 21 whose one end is rotatably connected to the tailstock 3, and one end which is rotatably connected to the movable die plate 5. An A link 22 that is pin-coupled so that its end side rotates relative to the other end side of the B link 21, a cross head 23 that receives the driving force of the mold clamping servo motor 7 via the ball screw mechanism 11, and one end Is connected to the cross head 23 so as to be pivotable, and the other end side is composed of a C link 24 which is pin-coupled so as to be rotated relative to an intermediate portion of the B link 21. The toggle link mechanism 6 of this example is a link mechanism having a five-point pivot structure having an A link 22, a B link 21, and a C link 24, but the gist of the present invention is limited to this. However, it is of course possible to provide other types of toggle link mechanisms.

  When the toggle link mechanism 6 drives the mold clamping servo motor 7 and advances the cross head 23 to the fixed die plate 2 side via the ball screw mechanism 11, the A link 22 and the B link 21 as shown in FIG. And the movable die plate 5 advances to the fixed die plate 2 side, and the fixed side die 15 and the movable side die 16 are clamped. As a result, a required mold cavity 25 is formed between the fixed side mold 15 and the movable side mold 16, so that the molding material can be injected into the mold cavity 25 by an injection device (not shown). . In this state, when the mold clamping servomotor 7 is driven and the crosshead 23 is moved backward to the tail stock 3 side via the ball screw mechanism 11, the A link 22 and the B link 21 are folded to move the movable die plate. 5 retracts toward the tail stock 3 side, and the fixed side mold 15 and the movable side mold 16 are opened. Thereby, the molded product can be taken out.

  As shown in FIG. 1, the controller 13 takes in the output signal s1 of the first encoder 9 and the output signal s2 of the second encoder 10, and sends the command signal s3 of the mold clamping servomotor 7 to the motor driver 14 in accordance with this. And a motor control circuit 31 and a CPU 32 that output a command signal s4 of the mold thickness adjusting motor 8, a parameter necessary for centering the mold, and a display / setting unit 33 that displays the set parameter, The storage unit 34 includes a ROM and a RAM for storing data and programs necessary for centering the mold. The motor driver 14 outputs drive signals s5 and s6 corresponding to the command signals s3 and s4 output from the controller 13 to the mold clamping servomotor 7 and the mold thickness adjusting motor 8, respectively.

  As shown in FIG. 2, the abutting surfaces (mold mirror surfaces) of the fixed side mold 15 and the movable side mold 16 have centering protrusions 41 and centering recesses for fitting them at the four corners. 42 is formed oppositely. These dies 15 and 16 are combined in a state where the centering protrusion 41 is fitted in the centering recess 42 before being mounted on the molding machine 1, and the fixed die plate 2 and the movable die plate are respectively combined. 5 is fastened by a plurality of mold fastening bolts (not shown). The assemblies of the die plates 2 and 5 and the dies 15 and 16 are integrated by a die-opening plate (not shown). The die-opening plate includes the die plates 2 and 5 and the dies. After the assembly of the molds 15 and 16 is mounted on the molding machine 1, it is removed. In the example of FIG. 2, a centering protrusion 41 is formed on the fixed mold 15 and a centering recess 42 is formed on the movable mold 16, but conversely, the fixed mold 15 Alternatively, the centering recess 42 may be formed on the movable die 16 and the centering protrusion 41 may be formed on the movable side mold 16. Further, the centering protrusion 41 and the centering recess 42 can be formed on the fixed side mold 15 and the movable side mold 16.

  When the display / setting unit 33 is operated to select centering of the mold, the display / setting unit 33 displays a screen shown in FIG. In this state, the user operates the display / setting unit 33 again, and the mold clamping force setting field 51, the centering mold clamping force setting field 52, the centering number setting field 53, the centering mold opening amount setting field 54, the mold thickness. In the advance amount setting field 55 and the mold thickness retraction amount setting field 56, the mold clamping force A, the centering mold clamping force B, the number of centering times C, the centering mold opening amount D, the mold thickness advance amount E, and the mold thickness retraction amount, respectively. Set F. Thereafter, when the user presses the mold centering button 57 of the display / setting unit 33 twice, the centering flow shown in FIG. 4 is executed.

  Hereinafter, the centering flow of the molding machine executed by the controller 13 will be described with reference to FIG. When executing the centering flow of the molding machine, the mold temperature is raised to a predetermined temperature, the mold fastening bolts are loosened, and the molds 15 and 16 are directed to the die plates 2 and 5 to some extent. The clamping force is adjusted so that it can be moved to.

  When the user presses the mold centering button 57 of the display / setting means 33 twice, the mold centering mode is activated (step S1), and the mold clamping servo motor 7 is driven in the opening direction to align the centering mold. The movable mold 16 is opened by the centering mold opening amount D (3 mm in the example of FIG. 3) set in the opening amount setting field 54, and the mold thickness adjusting motor 8 is driven in the backward direction, The tail stock 3 is retracted by the mold thickness retraction amount F (3 mm in the example of FIG. 3) set in the mold thickness retraction amount setting field 56 (step S2). As a result, no mold clamping force is applied between the fixed mold 15 and the movable mold 16. The sum of the centering mold opening amount D and the mold thickness retraction amount F is set to be smaller than the height H of the centering protrusion 41. Thereby, even when step S2 is completed, the centering protrusion 41 does not fall off from the centering recess 42, and the centering operation of this example can be performed smoothly.

  Next, the mold clamping servomotor 7 is driven in the closing direction to close the movable die 16 by the centering die opening amount D set in the centering die opening amount setting column 54 and to adjust the die thickness. The motor 8 is driven in the forward direction to advance the tail stock 3 to a position where the fixed side mold 15 and the movable side mold 16 touch (Step S3). Thereafter, the mold clamping servomotor 7 is driven again in the opening direction to open the movable-side mold 16 by the centering mold opening amount D set in the centering mold opening amount setting field 54, and the mold. When the thickness adjusting motor 8 is driven in the forward direction, the clamping force during centering becomes the centering clamping force B set in the centering clamping force setting field 52 (10 kN in the example of FIG. 3). The tail stock 3 is advanced to the position (step S4). As a result, the tailstock 3 is positioned at a position where the predetermined mold clamping force A set in the mold clamping force setting column 51 is obtained in the next mold clamping process. The tailstock 3 is fixed to the molding machine 1 at this position.

  Next, mold clamping (step S5) performed by driving the mold clamping servomotor 7 in the closing direction and mold opening (step S6) performed by driving the mold clamping servomotor 7 in the opening direction are performed. The fixed-side mold 15 and the movable-side mold 16 are centered by repeating the centering count C set in the centering count setting field 53. As described above, if the mold clamping and mold opening are repeated a plurality of times after the setting position of the tail stock 3 is determined, an unreasonable force acts on the stationary mold 15 and the movable mold 16 which are heavy objects. Therefore, the centering can be reliably performed, and the centering protrusion 41 and the centering recess 42 can be prevented from being damaged.

  After repeating mold clamping and mold opening a plurality of times, the mold clamping servo motor 7 is driven in the closing direction to perform mold clamping (step S7), and a message “Centering complete” is displayed on the display / setting means 33. Display (step S8). After confirming this message, the user firmly fastens the fixed die 15 to the fixed die plate 2 and firmly fastens the movable die 16 to the movable die plate 5. Thereby, the centering operation | work of the metal mold | dies 15 and 16 is complete | finished.

  The molding machine of this example executes the centering operation of the fixed side mold 15 and the movable side mold 16 only by controlling the driving of the mold clamping servo motor 7 and the mold thickness adjusting motor 8. There is no need to provide special equipment for centering that is not directly related to the manufacture of the product, and a molding machine having a centering function can be manufactured at low cost.

  Next, a second embodiment of the molding machine according to the present invention will be described with reference to FIGS. The molding machine according to the second embodiment is a so-called multicolor molding machine provided with a plurality of pairs of molds, FIG. 5 is a front view of a rotary table provided in the molding machine according to the second embodiment, and FIG. It is a flowchart which shows the procedure of the centering operation | work performed.

  As shown in FIG. 5, a rotary table 61 is rotatably attached to the movable die plate 5 in the multicolor molding machine, and a plurality (two in the example of FIG. 5) of the rotary table 61 are movable. Side molds 16a and 16b are attached. The rotary table 61 is intermittently rotated at predetermined angles (180 degrees in this example) via a belt 63 by a table rotating servo motor 62. Further, the same number of fixed side molds are attached to a fixed die plate (not shown) at positions facing the movable side molds 16a and 16b.

  The centering of each mold in the multicolor molding machine is executed according to the flow shown in FIG. As is clear from this figure, the centering of each mold in the multicolor molding machine is centered when the rotary table 61 is set to the first position, and the rotary table 61 is set to the second position. When the centering operation in the case of setting to the B-side is completed, after the centering operation on the A-side is completed, the rotary table 61 is rotated by a predetermined angle and the centering operation on the B-side is executed. The procedure of the centering operation on each surface is the same as that of the monochromatic molding machine shown in FIG.

  In the above-described embodiment, the centering operation is performed for both the fixed mold 15 and the movable mold 16 with the mold fastening bolts loosened, but one of the molds is fastened with the mold. The centering operation can be performed in a state where the bolt is firmly fixed to the die plate with a bolt and only the mold fastening bolt of the other mold is loosened.

It is a principal part block diagram of the molding machine which concerns on 1st Embodiment. It is explanatory drawing of the centering protrusion and centering recessed part which are formed in the surface of a metal mold | die. It is a figure which shows the screen structure at the time of the centering operation | work displayed on a display apparatus. It is a flowchart which shows the procedure of the centering operation | work of the molding machine which concerns on 1st Embodiment. It is a front view of the turntable with which the molding machine which concerns on 2nd Embodiment is equipped. It is a flowchart which shows the procedure of the centering operation | work of the molding machine which concerns on 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molding machine 2 Fixed die plate 3 Tail stock 4 Tie bar 5 Movable die plate 6 Toggle link mechanism 7 Mold clamping servo motor 8 Mold thickness adjusting motor 9, 10 Encoder 11, 12 Ball screw mechanism 13 Controller 14 Motor driver 15 Fixed side metal Mold 16 Movable mold 31 Motor control circuit 32 CPU
33 Display / setting means 34 Storage means 41 Centering protrusion 42 Centering recess 51 Mold clamping force setting field 52 Centering mold clamping force setting field 53 Centering frequency setting field 54 Centering mold opening amount setting field 55 Mold thickness advance amount setting Field 56 Type thickness retraction amount setting field 61 Rotary table 62 Servo motor for table rotation

Claims (2)

A mold thickness adjusting mechanism for adjusting the setting position of the tail stock with respect to the fixed die plate by rotating the mold thickness adjusting motor, and a movable die plate for the fixed die plate by rotating the servo motor for clamping. A mold clamping device for moving forward and backward, a fixed mold fixed to the fixed die plate by a mold mounting bolt, a movable mold fixed to the movable die plate by a mold mounting bolt, and the mold A controller for controlling the driving of the thickness adjusting motor and the mold clamping servomotor,
A centering protrusion and a centering recess for fitting it are formed opposite to each other on the abutting surfaces of the fixed side mold and the movable side mold, and
The controller sets the number of times of centering when performing the centering operation of the fixed side mold and the movable side mold, the opening amount of the centering die, the amount of mold thickness retraction, and the clamping force at the time of centering. And
Wherein the controller, when the mold centering mode is activated, controls the driving of the servo motor for clamping to advance the rear of the movable die plate by the centering mold opening amount, before Symbol type thickness retracted after controlling the driving of the mold thickness adjusting motor so as to advance the rear of the tail stock in an amount, the drive of the servomotors for clamping to advance the movable die plate by the centering mold opening amount The tail capable of generating a mold clamping force during molding by controlling the drive of the mold thickness adjusting motor so as to advance the tail stock to a position where the mold clamping force at the centering can be obtained. A stock setting position is determined, and thereafter, the mold clamping servo motor is repeatedly driven so that the movable die plate moves forward and backward by the centering die opening amount by the centering number of times. Machine.   2. The molding machine according to claim 1, wherein the opening amount of the centering die and the retraction amount of the die thickness are set so that a sum thereof is smaller than a height of the centering protrusion.

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