JP2791903B2 - Mold clamping force control device for toggle mold clamping device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling a mold clamping force by controlling a position of a toggle head in a toggle mold clamping apparatus.

[Prior art] Conventionally, as a mold clamping force control device of a toggle-type mold clamping device, there has been a device that adjusts a cross-head driving amount based on a position where a fixed side and a movable side of a mold are in contact with each other as a reference (zero). Are known.

[Problems to be Solved by the Invention] However, this type of conventional mold clamping force control device is limited to a change in mold clamping force caused by a temperature change of a mold and a tie bar and a wear of a connecting member of a toggle support and a tie bar. There is a problem that the control accuracy of the mold clamping force is poor because it cannot be handled.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mold clamping force control device of a toggle-type mold clamping device having good control of mold clamping force.

Means for Solving the Problems The present invention provides a crosshead position detecting means for detecting a position of a crosshead, a crosshead position control means for controlling a crosshead driving means, and a target value of a mold clamping force. And a mold clamping force detecting means for detecting a mold clamping force by detecting a displacement of the toggle arm, wherein the crosshead position control means is provided by the mold clamping force setting means. The command value of the position of the crosshead is determined by comparing the target value of the mold clamping force with the detected value of the mold clamping force detected by the mold clamping force detecting means. Are compared to calculate the corrected command value by correcting the command value of the position of the crosshead, and control the position of the crosshead based on the corrected command value.

[Operation] The present invention compares the detected value of the clamping force detected by the clamping force detecting means for detecting the clamping force by detecting the displacement of the toggle arm with a target value to determine the command value for the position of the crosshead. Then, the command value of the crosshead position is corrected by calculating the corrected command value by comparing the command value with the value detected by the crosshead position detecting means, and the position of the crosshead is calculated based on the corrected command value. Can be controlled.

Example Next, an example of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a mold. The mold 1 has a fixed mold 2 and a movable mold 3. The fixed mold 2 is fixed to a fixed platen 4. The movable mold 3 is fixed to a movable platen 5.

Two tie bars 6 and 7 are fixed to the fixed platen 4. The movable platen 5 is provided on the tie bars 6 and 7 so as to be movable. A toggle support 8 is fixed to the other ends of the tie bars 6 and 7.

A crosshead 9 is arranged between the movable platen 5 and the toggle support 8. The crosshead 9 is fixed to a drive shaft 10a of a crosshead driving device 10.
Toggle arms 11a are provided at both ends of the crosshead 9, respectively.
11b is provided rotatably.

Two toggle arms 1 are provided at the rotating end of the toggle arm 11a.
1c and 11d are provided rotatably. Toggle arm 11c
Is connected to the movable platen 5. On the other hand, the end of the toggle arm 11d is connected to the toggle support 8. Two toggle arms 11e and 11f are also rotatably provided at the rotation end of the toggle arm 11b. Toggle arm 1
The end of 1e is connected to the movable platen 5. On the other hand, the end of the toggle arm 11f is connected to the toggle support 8.

When the crosshead 9 is moved by operating the crosshead driving device 10, the moving force of the crosshead 9 is changed to the toggle arms 11a, 11b, 11c,
It is transmitted to the movable platen 8 via 11d, 11e, 11f, and the movable platen 8 is moved.

A mold clamping force detector 12 is provided on the toggle arm 11c. The mold clamping force detector 12 detects the displacement of the toggle arm 11c and detects the pressure contact force between the fixed mold 2 and the movable mold 3, that is, the mold clamping force.

The value of the mold clamping force detected by the mold clamping force detector 12 is given to the comparator 14 via the amplifier 13. The amplifier 13 is connected to an amplifier zero adjuster 15. A mold clamping force setting device 16 is connected to another input terminal of the comparator 14. The mold clamping force setting device 16 gives a target value of the mold clamping force to the comparator 14. The comparator 14 compares the target value of the mold clamping force with the detected value of the mold clamping force detected by the mold clamping force detector 12.

The output of the comparator 14 is provided to a command value generator 17. The command value generator 17 receives the output of the comparator 14 and generates a command value for commanding the position of the crosshead 9. Command value generator 17
Is supplied to a comparator 18. The position of the crosshead 9 is detected by a crosshead position detector 19. The detection value of the crosshead position detector 19 is given to the comparator 18.

The comparator 18 compares the command value from the command value generator 17 with the detection value from the crosshead position detector 19. Comparator 18
Is supplied to a compensator 20. The compensator 20 corrects the command value and supplies the corrected command value to the crosshead drive device 10 via the amplifier 21. This crosshead drive
Numeral 10 controls the position of the crosshead 9 based on the correction command value.

[Effect of the Invention] In the present invention, the detected value of the mold clamping force detecting means for detecting the mold clamping force on the toggle arm corresponds to a change in the mold clamping force caused by a temperature change of the mold and the diver, and Since the position of the crosshead is controlled by comparing the detection value of the mold clamping force detection means with the target value, the control accuracy of the mold clamping force is good.

[Brief description of the drawings]

FIG. 1 is a view showing a configuration of a mold clamping force control device of a toggle type mold clamping device according to the present invention. 2 ... fixed mold, 3 ... movable mold, 9 ... crosshead, 10
…… Cross head drive device, 12 …… Mold clamping force detector, 14 ……
Comparator, 16 …… Clamping force setting device, 17 …… Command value generator, 19…
… Crosshead position detector, 20 …… Compensator.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G05D 15/00-15/01 G05D 17/00-17/02 B22D 17/26 B29C 33/22-33 / 24 B29C 45/64-45/67

Claims (1)

(57) [Claims] 1. Crosshead position detecting means for detecting a position of a crosshead, crosshead position controlling means for controlling a crosshead driving means, mold clamping force setting means for giving a target value of the clamping force to the crosshead position detecting means, Mold-clamping-force detecting means for detecting a mold-clamping force by detecting displacement of a toggle arm, wherein the crosshead position control means comprises: The command value of the position of the crosshead is determined by comparing the value of the mold clamping force detected by the mold clamping force detecting means, and the value of the crosshead is determined by comparing the command value with the value detected by the crosshead position detecting means. A mold clamping force control device for a toggle-type mold clamping device, wherein a corrected command value is calculated by correcting a position command value, and the position of the crosshead is controlled based on the corrected command value.