JP6238864B2 - Apparatus and method for synchronous control of mold and joining cylinder of hollow molding machine - Google Patents

Description

The present invention relates to a synchronous control apparatus and method for a mold of a hollow molding machine and a joining cylinder, and in particular, when hollow molding is performed by a mold composed of first and second mold parts with a built-in object in a parison. The present invention relates to a new improvement for holding a built-in object in the same position.

Conventionally, as one of the molding method according to a blow molding machine, not shown, there is a molding method for molding pinching a parison by remained clamping device was placed internals parison, built-in before the parison comes The mold is held open in the space between them.
Furthermore, while the mold was closed at each mold part, the position was maintained, and the built-in object and the parison were joined to each other.

Further, to the each mold section, as described below, the same bonding cylinder is provided in each mold portion, a portion wherein the bonding cylinder is attached, since within each mold section, the mold閉中the tip position of the joining rod of the joint cylinder was to be changed in accordance with the closing operation of the mold portions (moved in the closing direction).
Therefore, it is necessary to control the operation of the joining cylinder in synchronism with the mold closing operation of each mold part. However, as a result of investigating the prior art documents, the configuration in which the two-axis positioning synchronous control is performed by the normal positioning control method. Are disclosed in, for example, Patent Document 1 and Patent Document 2, but in a configuration in which a built-in object is provided in a parison and hollow molding is performed, no prior art document has been found as a result of investigation.

JP 2003-131712 A JP 2002-326140 A

Since the conventional hollow molding method is configured as described above, the following problems exist.
In other words, when performing hollow molding by closing the mold with the built-in object in the parison (so-called ship-in molding method), in the conventional configuration, the holding position of the built-in object is not stable and the mold is closed. The built-in objects could be damaged, and it was difficult to improve the yield.

The present invention has been made to solve the above problems, in particular, first without turning internals parison, when the hollow molded by the second mold section, the first, second gold To provide a synchronous control device and method for a die and a joining cylinder of a hollow molding machine that can stably mold without holding damage by holding a built-in object in a predetermined position by synchronously controlling the mold part and each joining cylinder. Objective.

According to the present invention, there is provided a synchronous control device for a mold and a joining cylinder of a hollow molding machine, wherein the parison is sandwiched and molded by a mold composed of first and second mold parts while a built-in object is placed in the parison from the crosshead. In the synchronous control device for the mold and joining cylinder of the hollow molding machine, a servo motor for opening and closing the mold for opening and closing the mold and a servo motor for entering and exiting the joining cylinder provided in the first mold part are provided. A joining cylinder, a joining rod that is provided in the joining cylinder and is in contact with and held by the built-in object, and is disposed so as to be freely accessible in and out of the first mold part, and the mold A controller for synchronously controlling the servo motor for opening and closing and the servo motor for entering and exiting the joining cylinder, and during the mold closing operation of the mold, the joining in the direction opposite to the mold closing operation. The position of the head is controlled synchronously by the control unit, a configuration was to hold the same position the leading position of the joining rod abuts the built-in as an absolute position and,
The joint cylinder servo motor is feedback controlled using a torque detection value obtained by detecting the torque of the joint cylinder servo motor, and a pressure sensor is provided at the tip of the joint rod. The rod tip pressure of the joining rod contacting the built-in object is detected, and the servo motor for entering and exiting the joining cylinder is feedback-controlled using the rod tip pressure, and the present invention According to the method of synchronous control between the mold and the joining cylinder of the hollow molding machine, the parison is sandwiched and molded by the mold composed of the first and second mold parts while the built-in object is put in the parison from the cross head. In a synchronous control method of a mold and a joining cylinder of a hollow molding machine, a mold opening / closing servo for opening and closing the mold And over motor, the bonding cylinder having a servo motor for joining the cylinder and out is provided in the first mold portion, the said first mold portion as well as contact with held in the built-in is provided on the bonding cylinder first 1. A mold for the mold, comprising: a joining rod which is disposed outside the mold part so as to freely enter and exit; and a control unit for synchronously controlling the servo motor for opening and closing the mold and the servo motor for entering and exiting the joining cylinder. During the closing operation, the position of the joining rod is synchronously controlled by the control unit in the direction opposite to the mold closing operation, and the tip position of the joining rod contacting the built-in object is held as the absolute position. Yes, and the feedback control of the servo motor for entering and exiting the joining cylinder using the torque detection value obtained by detecting the torque of the servo motor for entering and exiting the joining cylinder In addition, a pressure sensor is provided at the tip of the joining rod, detects the rod tip pressure of the joining rod that contacts the built-in object, and uses the rod tip pressure to enter and exit the joining cylinder. This is a method for feedback control of a servo motor.

Since the synchronous control apparatus and method for a die and a joining cylinder of a hollow molding machine according to the present invention are configured as described above, the following effects can be obtained.
That is, a synchronous control device for a mold and a joining cylinder of a hollow molding machine in which the parison is sandwiched and molded by a mold composed of first and second mold parts while a built-in object is put in the parison from the crosshead, and In the method, a mold opening / closing servo motor for opening and closing the first and second mold parts, and a joining cylinder provided in the first and second mold parts and having a joining cylinder in / out servo motor, wherein a junction rod disposed freely out in the first mold part in the first mold part outer, servomotors and for the mold opening and closing as well as contact with held in the built-in is provided on the bonding cylinder A controller for synchronously controlling the servo motor for entering and exiting the joining cylinder, and the position of the joining rod in a direction opposite to the mold closing operation during the mold closing operation of the first and second mold parts. The position of the built-in object provided in the parison is controlled by the control unit and is configured to hold the same position with the tip position of the joining rod contacting the built-in object as an absolute position. It is as it was at the beginning and can be stably molded without any damage.
In addition, by using the torque detection value obtained by detecting the torque of the servo motor for entering / exiting the joining cylinder, feedback control of the servo motor for entering / exiting the joining cylinder is performed, so that the synchronization control of the joining rod of the joining cylinder is performed with higher accuracy And the ship-in molding can be made more stable.
In addition, a pressure sensor is provided at the tip of the joining rod, detects the rod tip pressure of the joining rod contacting the built-in object, and uses the rod tip pressure to control the servo motor for entering and exiting the joining cylinder. By being configured to perform feedback control, the position of the tip end of the joining rod can be controlled with higher accuracy.

It is a block diagram which shows the synchronous control apparatus and method of the metal mold | die and joining cylinder of a hollow molding machine by this invention. It is a block diagram which shows the other form of the principal part of FIG. FIG. 2 is a process diagram in the case of performing ship-in hollow molding using the mold of FIG. 1. It is a block diagram which shows the other form of FIG. It is a block diagram which shows the electrical system at the time of using the pressure sensor of FIG.

The apparatus and method for synchronously controlling a mold and a joining cylinder of a hollow molding machine according to the present invention provides a method in which a joining rod of a joining cylinder is placed in a first position when hollow molding is performed by the first and second mold parts while a built-in object remains in the parison . 1. By retracting in accordance with the closing operation of the second mold part , the holding position of the built-in object is stabilized, and the yield of the ship-in type hollow molding is stabilized.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a synchronous control apparatus and method for a mold and a joining cylinder of a hollow molding machine according to the present invention will be described below with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a high-level control unit including a CPU 2 and a positioning unit 3, and a data command 4 including speed, position, acceleration / deceleration, etc. from the CPU 2 is input to the positioning unit 3. It is configured to be.

A mold opening / closing position command 3A from the positioning unit 3 is input to the first servo driver 5, and a mold opening / closing signal 5A from the first servo driver 5 is input to the mold opening / closing servo motor 6. .
A rotation detection signal 7A from a rotation detector 7 consisting of an encoder or the like provided in the mold opening / closing servo motor 6 is fed back to the first servo driver 5 and is moved along the mold opening / closing position command 3A. The operation of the servo motor 6 for opening and closing the mold is feedback-controlled , and the mold 10 including the first and second mold portions 10A and 10B shown in FIG. 3 (only the first mold portion 10A is shown in FIG. 3). The second mold part 10B having a shape and structure symmetrical to that of the first mold part 10A shown in the figure is provided on the left side).

In FIG. 3, only the right side of the first and second mold parts 10A and 10B is shown, but for example, the second mold located on the left side of the ship-in built-in object 11 made of a bracket or the like. mold portion 10B is composed of the same structure as the right side of the first mold portion 10 a, is configured so as to be able to mold clamping by sandwiching the internals 11 by clamping device (not shown), where Is omitted.

The joining cylinder position command 3B from the positioning unit 3 of the control unit 1 is input to the second servo driver 12, and the joining cylinder exit / entry signal 12A from the second servo driver 12 is sent to the joining cylinder exit / entry servo motor 13. Have been entered.
A rotation detection signal 14A from a rotation detector 14 composed of an encoder or the like provided in the servo motor 13 for entering / exiting the joining cylinder is fed back to the second servo driver 12, and the joining signal is sent along the joining cylinder position command 3B. The operation of the cylinder entrance / exit servomotor 13 is feedback-controlled so that the entry / exit operation including the reciprocating linear motion of the joining cylinder 15 having the joining rod 15A in the mold 10 shown in FIG. 3 can be performed. .

In FIG. 3, as described above, only the right side of the first and second mold parts 10A and 10B is shown, but the second mold part 10B located on the left side of the built-in object 11 is shown. right of the first mold portion 10 a in the same junction cylinder 15 is provided in the.

  The joining cylinder speed command 3B output from the positioning unit 3 theoretically holds the preset absolute position of the tip of the joining rod 15A if the configuration of FIG. 1 is operating normally. However, there is a case where the absolute position cannot be held by simple positioning control due to “deflection” of the joining rod 15A and “extension / contraction / swing of the built-in object 11”.

  Therefore, in order to avoid the above situation and hold the joining rod 15A in the absolute position, torque control during the servo operation shown in FIG. 2 and the joining rod by the pressure sensor 20 shown in FIGS. Two methods of pressure control using the tip pressure 20A can be employed.

Since the joining cylinder speed command 3B at the time of positioning of the joining rod 15A input from the control unit 1 to the second servo driver 12 is a preset speed + −α · + −β, As shown in FIG. 2, the torque of the servo motor 6 for entering / exiting the joining cylinder during the servo operation is monitored, and the detected current torque value _PT2 and the preset torque setting value _PT1 are expressed by the following equation (1). Comparison is made as in equation _(1), and α is obtained by using the deviation e _(t) as well-known PI (proportional integration) control.

  As shown in FIGS. 4 and 5, a pressure sensor 20 made of a load cell or the like is provided in the recess 11b formed in the one surface 11a of the built-in object 11, and the recess 11b The joining rod 15A that can freely enter and exit in the mold 10 is arranged along the direction of arrow A so that the pressure sensor 20 can be pressed by the tip portion 15Aa.

The connecting rod tip pressure 20 </ b> A from the pressure sensor 20 is configured to be input to the control unit 1 via the amplifier 21.
Accordingly, the connecting rod tip pressure 20A during the servo operation is monitored, and a pressure value P _P1 and a current current pressure value P _P2 that are arbitrarily set in advance are input to the control unit 1, The two values are compared and β is obtained as a well-known PI (proportional integration) control.

Next, the operation of the synchronous control apparatus and method for the mold and joining cylinder of the hollow molding machine according to the present invention will be described.
As shown in FIG. 4, the mold 10 is shown only on the right side, and the mold of the other second mold part 10B located on the left side of the built-in object 11 is not shown . The first and second mold parts 10A and 10B have the same structure in which the joining cylinder 15 having the joining rod 15A is provided, and the first and second mold parts 10A and 10B on both the left and right sides The built-in object 11 is held in a suspended state by the joining rod 15A.
Further, only one joining rod 15A is shown in the figure, but actually, it is held by eight joining rods 15A and is a molten parison (not shown) that hangs down from a well-known crosshead (not shown). 1), the built-in object 11 is arranged inside.

In the state described above, in the step (A) of FIG. 3, as shown in FIG. 1 , the left and right first and second mold parts 10 A and 10 B are sent by the mold opening / closing speed command 3 A from the control part 1. There is a mold opening state, in this state, joining the rod 15A of the joint cylinder 15 is in a state of completely being provided inside the first mold portion 10 a with are most retreated.
In the state described above, the built-in object 11 is held at a predetermined absolute position between the first and second mold parts 10A and 10B via a holding means (not shown).

In the state of the aforementioned FIG. 3 (A), the state in which the parison (not shown) is suspended from the crosshead on the outer periphery of the built-in 11, as shown in FIG. 3 (B), first, second mold portion 10 a, type closing operation of 10B is started, the joining cylinder 15 is advanced to move along the mold closing direction B of the first mold portion 10 a, the distal end portion 15Aa of the joint rod 15A is the built by engaging in the recess 11b of the object 11, the built-in 11 is positioned in a predetermined absolute position by the joining rod 15A from the first mold portion 10 a.

Next, in order to join the built-in object 11 and the parison, the first and second mold parts 10A and 10B are moved forward to each other. At this time, the first, the second mold portion 10 a, the distal end portion 15Aa of the junction rods 15A and to advance 10B will be pressing the internals 11, so that the absolute position of the built-in 11 moves.
Therefore, the mold closing operation of the second mold portion 10 B, the mold closing direction B described above to actuate the joint cylinder 15 in the reverse direction, to synchronously controls the position of the joint rod 15A by the control unit 1, The first and second mold portions 10A and 10B are held so that the tip end position of the tip end portion 15Aa of the joining rod 15A contacting the built-in object 11 is the absolute position and is held at the same position as shown in FIG. The movement of the joining rod 15A is controlled.

Further, as described above, the torque control in FIG. 2 and the pressure control in FIG. 5 are used in combination during the positioning control of the first and second mold parts 10A , 10B and the joining cylinder 15 as described above. The accuracy of positioning control for holding 11 at the absolute position can be greatly improved.

The gist of the synchronous control device and method for the mold and joining cylinder of the hollow molding machine according to the present invention is as follows.
That is, a synchronous control device for a mold and a joining cylinder of a hollow molding machine in which the parison is sandwiched and molded by the first and second mold parts 10A and 10B while the built-in object 11 is put in the parison from the crosshead, and In the method
A joining cylinder 15 having a die opening / closing servomotor 6 for opening and closing by the first and second mold parts 10A, 10B and a joining cylinder exit / entry servomotor 13 provided in the first mold part 10A. When the junction rods 15A disposed freely out in the first mold part 10A in the first mold portion 10 a out and holds in contact with the built-in 11 provided on the joining cylinder 15 And a control unit 1 for synchronously controlling the mold opening / closing servomotor 6 and the joining cylinder moving-in / out servomotor 13, and during the mold closing operation of the first and second mold parts 10A, 10B. The position of the joining rod 15A is synchronously controlled by the control unit 1 in the direction opposite to the mold closing operation, and the tip position of the joining rod 15A contacting the built-in object 11 is the same position as the absolute position. And the feedback control of the servo motor 13 for entering / exiting the connecting cylinder is performed using a torque detection value obtained by detecting the torque of the servo motor 13 for entering / exiting the connecting cylinder. In addition, as shown in FIG. 4, a pressure sensor 20 is provided at the tip 15Aa of the joining rod 15A to detect the rod tip pressure of the joining rod 15A that contacts the built-in object 11. And a configuration and method for feedback control of the servo motor 13 for entering and exiting the joining cylinder using the rod tip pressure.

The apparatus and method for synchronously controlling a mold and a joining cylinder of a hollow molding machine according to the present invention includes a first and a second method for molding a parison by holding a built-in object with a joining rod of a joining cylinder provided in the mold . By synchronously controlling the closing of the mold parts 10A and 10B and the retraction of the joining rod, the absolute positioning of the built-in object can be maintained and the yield of the ship-in hollow molded product can be improved.

1 Control unit 2 CPU
3 Positioning unit 3A Mold opening / closing speed command 3B Joining cylinder speed command 4 Data command 5 First servo dry 6 Mold opening / closing servo motor 7 Rotation detector 7A Rotation detection signal 10 Mold
10A 1st mold part
10B Second mold part 11 Built-in object 11a One surface 11b Recess 15 Joining cylinder 15A Joining rod 20 Pressure sensor 20A Joining rod tip part pressure

Claims (6)

A mold for a hollow molding machine in which the parison is sandwiched and molded by a mold (10) composed of first and second mold parts (10A, 10B) with the built-in object (11) inserted in the parison from the crosshead. In the synchronous control device for the mold and the joining cylinder,
A joint cylinder (6) for opening and closing the mold (10), and a joining cylinder having a servo motor (13) for entering and exiting the joining cylinder provided in the first mold part (10A) 15), and out at the first mold portion (10A) in the first mold portion (10 a) out and holds in contact with the internals (11) provided on the bonding cylinder (15) A joint rod (15A) disposed freely, and a control unit (1) for synchronously controlling the servo motor for opening and closing the mold (6) and the servo motor for entering and exiting the joining cylinder (13),
During the mold closing operation of the mold (10), the position of the joining rod (15A) is synchronously controlled by the control unit (1) in the direction opposite to the mold closing operation, and comes into contact with the built-in object (11). A device for synchronously controlling a mold and a joining cylinder of a hollow molding machine, wherein the joining rod (15A) is configured to hold the same position with an absolute position as a tip position.   2. The hollow according to claim 1, wherein the connecting cylinder in / out servo motor (13) is feedback-controlled using a torque detection value obtained by detecting the torque of the connecting cylinder in / out servo motor (13). Synchronous control device for mold and joining cylinder of molding machine.   A pressure sensor (20) is provided at the tip (15Aa) of the joining rod (15A), and detects the rod tip pressure of the joining rod (15A) contacting the built-in object (11). The synchronous control apparatus for a die and a joining cylinder of a hollow molding machine according to claim 2, wherein the servo motor (13) for entering and exiting the joining cylinder is feedback-controlled using a partial pressure. A mold for a hollow molding machine in which the parison is sandwiched and molded by a mold (10) composed of first and second mold parts (10A, 10B) with the built-in object (11) inserted in the parison from the crosshead. In the synchronous control method of the mold and the joining cylinder,
A joint cylinder (6) for opening and closing the mold (10), and a joining cylinder having a servo motor (13) for entering and exiting the joining cylinder provided in the first mold part (10A) 15), and out at the first mold portion (10A) in the first mold portion (10 a) out and holds in contact with the internals (11) provided on the bonding cylinder (15) Using a freely arranged joining rod (15A), and a control unit (1) for synchronously controlling the servo motor (6) for opening and closing the mold and the servo motor (13) for entering and exiting the joining cylinder,
During the mold closing operation of the mold (10), the position of the joining rod (15A) is synchronously controlled by the control unit (1) in the direction opposite to the mold closing operation, and comes into contact with the built-in object (11). A method for synchronously controlling a die and a joining cylinder of a hollow molding machine, wherein the tip position of the joining rod (15A) is held as an absolute position and held at the same position.   5. The gold for a hollow molding machine according to claim 4, wherein feedback control is performed on the servo motor for entering and exiting the joining cylinder using a torque detection value obtained by detecting the torque of the servo motor for entering and exiting the joining cylinder. Synchronous control method of mold and joining cylinder.   A pressure sensor (20) is provided at the tip (15Aa) of the joining rod (15A), and detects the rod tip pressure of the joining rod (15A) contacting the built-in object (11). 6. The method for synchronously controlling a die and a joining cylinder of a hollow molding machine according to claim 5, wherein feedback control is performed on the joining cylinder in / out servo motor (13) using a partial pressure.

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