JPH01275106A - Mechanical mold opening stop positioning device - Google Patents

Abstract

PURPOSE:To set up simply the mold opening stop position of a movable plate in a short time, by converting the setup value of the mold opening stop position of a movable plate into the stop position in the mold opening direction of a mold clamping cylinder when it is inputted, and by controlling a stopper moving means to move it so that said rod stops at said stop position. CONSTITUTION:In order to stop a movable plate 5 at a predetermined mold opening stop position, the setup value of of the mold opening stop position of a movable plate 5 is inputted into the mold opening stop position setup section 27, and in a conversion circuit 28 the setup value becomes the value converted to the stop position in the mold opening direction of the rod 8 of a mold clamping cylinder 7. In this case, the movement of a stopper 11 is read by a encoder 23 and the stop position of the rod 8 of the mold clamping cylinder 7 is calculated from the movement of the stopper 11 with a control circuit 29. In this manner, as the rod 8 of the mold clamping cylinder 7 moves in the mold opening direction during the mold opening of the movable plate 5, the rod 8 stops at the stop position calculated with the conversion circuit and the mold opening position of the movable plate 5 becomes the same as the setup value.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a mechanical mold for mechanically setting a mold opening stop position in an injection molding machine or a die casting machine having a toggle type mold clamping mechanism. This invention relates to an open/stop position setting device.

[Prior Art] Generally, an injection molding machine having a toggle-type mold clamping mechanism has a toggle link connected to a rod of a mold clamping cylinder.
By expanding and contracting the rod of the mold clamping cylinder, the movable platen moves toward and away from the fixed platen, thereby opening and closing the mold provided between the movable platen and the fixed platen.

As a device for setting the mold opening stop position of the movable platen, there are electrical or mechanical devices.

Electric devices electrically detect the mold opening stop position of the movable plate using a limit switch or encoder, etc., and electrically switch the control valve that controls the mold clamping cylinder to control the movement of the rod of the mold clamping cylinder. This stops the movable platen at a predetermined mold opening stop position. However, due to the delayed response of the control valve, etc., the stopping position of the rod deviates, and there is a drawback that the rod cannot be reliably stopped at the specified mold opening stopping position. Therefore, a mechanical device is used to ensure that the movable platen is stopped at a designated stop position.

In a mechanical device, a threaded rod-shaped stopper is provided in a mold-clamping cylinder, and by applying the tip of the stopper to the piston of the mold-opening cylinder, the movement of the rod of the mold-clamping cylinder is stopped. This is to stop the moving board. To set the mold opening stop position, the movable plate is moved to the set position, and the operator turns the stopper so that the tip of the stopper hits the piston of the mold clamping cylinder.

Then, the position of the stopper is determined by the feel of the hand when it hits.

[Problems to be Solved by the Invention] However, in the mechanical mold opening stop position setting device described above, the position of the stopper is determined by the touch of the hand, so it is difficult to accurately set the position of the stopper. Therefore, there was a problem in that it was necessary to check the contact between the stopper and the piston many times in order to set it accurately.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a mechanical mold opening stop position setting device that can easily set the mold opening stop position of a movable platen in a short time.

[Means for Solving the Problems] The present invention has been made to achieve the above object, and includes a stopper moving means for moving a stopper to change the stopping position of the rod of the mold clamping cylinder in the mold opening direction. , when the set value of the mold opening stop position of the movable plate is input, the set value is converted to the stop position of the rod of the mold clamping cylinder in the mold opening direction, and the said rod is stopped at this converted stop position. and a control device that controls the stopper moving means to move the stopper.

[Operation] In the present invention, when the set value of the mold opening stop position of the movable platen is input into the control device, the set value is converted into the stop position of the rod of the mold clamping cylinder in the mold opening direction. Then, the control device operates the stopper moving means to move the stopper so that the rod of the mold clamping cylinder stops at this converted stop position.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In FIG. 1, ■ is a bed of an injection molding machine, and a fixed platen 2 is fixed on this bed l. Further, a support plate 3 is provided on the bed l, facing the fixed plate 2. The fixed platen 2 and the support plate 3 are connected by four tie bars 4, and a movable plate 5 is attached between the fixed plate 2 and the support plate 3 so as to be slidable on the tie bars 4. There is. The movable platen 5 is connected to the support plate 3 and the rod 8 of the mold clamping cylinder 7 via a toggle link 6.

The mold clamping cylinder 7 is attached to the support plate 3, and by expanding and contracting its rod 8, the movable plate 5 is moved in the direction toward and away from the fixed plate 2, and the space between the movable plate 5 and the fixed plate 2 is moved. The mold K provided in the mold K is opened and closed. Further, as shown in FIG. 2, the pad cover 9 of the mold clamping cylinder 7 is provided with an oil filler port 9a, and a through hole 9b is formed in the shaft center portion. A stopper 11 is inserted into the cylinder tube 10 of the mold clamping cylinder 7 through this through hole 9b. The stopper 11 is formed into a rod shape, and has an enlarged diameter portion +1a formed at its tip that fits into the inner peripheral surface of the cylinder tube 10, and a through hole of the head cover 9 at the base end side of the enlarged diameter portion 11a. A cylindrical portion 11b that fits into the cylindrical portion 9b is formed, and a rod-shaped portion 11c having a reduced diameter is formed on the base end side of the cylindrical portion 11b.
A male threaded portion lid with an enlarged diameter is formed on the proximal end side of c. Further, a hole 11e is formed in the cylindrical portion 11b and the enlarged diameter portion +1a, and the hole 11e communicates from the outer periphery of the cylindrical portion 11b to the distal end surface of the enlarged diameter portion 11a, so that the oil supplied from the oil filler port 9°a can flow into the cylindrical portion 11b and the enlarged diameter portion +1a. It flows to the head side of the piston 12 through the hole 11e. Furthermore, a groove IIf extending in the axial direction is formed on the outer periphery of the cylindrical portion 11b. A cover 13 whose tip end is fixed to the head cover 9 is provided around the stopper 11. A guide bolt 14 whose tip end is inserted into the groove 11f of the stopper I+ is screwed into the cover 13. Also, stopper 1
1 is connected to a hydraulic motor I6 via a coupling 15. The coupling 15 is formed in a cylindrical shape, and has a threaded hole 15a screwed into the male threaded portion lid of the stator bar 11 at the axial center on the distal end side, and a hydraulic motor at the axial center on the proximal end side. A hole 15b is formed which is connected to the 16 output shafts 16a via a key. Further, a ring 18 is fitted onto the outer periphery of the coupling 15 via a key 17, and an electromagnetic brake 19 is provided on the outside of the ring 18. The electromagnetic brake 19 has a main body fixed to the proximal end surface of the cover 13, and normally tightens the ring 18 to stop the rotation of the coupling 15.

Further, a coupling cover 20 is fixed to the base end side of the main body of one electromagnetic brake. The hydraulic motor 16 is fixed to a plate 2 (2) attached to the base end surface of the coupling cover 20. Further, the hydraulic motor 16 is formed in a double-shaft type, and the output shaft +6a
An encoder 23 is connected to the output shaft 16b on the opposite side via a coupling 22. This encoder 23
is the temporary 25 fixed to the temporary 21 by the connecting member 24.
is fixed. Further, the hydraulic motor 16 and the electromagnetic brake 19 are controlled by a control device 26 as shown in FIG.
It is now controlled by. Control device 26
A conversion circuit 28 converts the set value of the mold opening stop position of the movable platen 5 inputted to the mold opening stop position setting unit 27 into a stop position of the rod 8 of the mold clamping cylinder 7 in the mold opening direction, and this conversion value. The control circuit 29 controls the hydraulic motor 16 and the electromagnetic brake 19 based on the following. Conversion circuit 2
8 is a rod 8 of the mold clamping cylinder 7, as shown in FIG.
The relationship between the position X in the mold opening direction of When the set value of the opening stop position is input, the set value is converted into the stop position of the rod 8 of the mold clamping knob 7 in the mold opening direction. Control circuit 2
9 is the stopper 1 according to the data from the encoder 23.
Calculate the stop position of the piston 12, that is, the rod 8 that contacts the tip end surface of the piston 12, and compare this stop position of the rod 8 with the stop position of the rod 8 converted by the conversion circuit 28. If the two do not match, calculate the stop position of the rod 8. , control valve 30 until both match.
The hydraulic motor 16 is controlled to rotate the hydraulic motor 16 and move the stopper II. Furthermore, when the stop position of the rod 8 obtained from the encoder 23 becomes equal to the stop position of the rod 8 converted by the conversion circuit, the control circuit 29 stops the rotation of the hydraulic motor 16 and controls the electromagnetic brake 19. The rotation of the coupling 15 is restrained by controlling the rotation of the coupling 15. Next, the operation of the device configured as described above will be explained.

In order to stop the movable platen 5 at a predetermined mold opening stop position, first, a setting value of the mold opening stop position of the movable platen 5 is input into the mold opening stop position setting section 27. Then, the conversion circuit 28 converts the set value into the stop position of the rod 8 of the mold clamping cylinder 7 in the mold opening direction. And encoder 23
If the stop position of the rod 8 obtained from the calculation is different from the above converted value, the control circuit 29 operates the control valve 30 to rotate the hydraulic motor 16. Then, the coupling 15 rotates, and the screw hole +5 of the coupling 15 is rotated.
The stopper 11 screwed into the stopper a is guided by the guide bolt 14 and moves in the axial direction.

At this time, the amount of movement of the stopper 11 is read by the encoder 23, and further, the control circuit 29 calculates the stop position of the rod 8 of the mold clamping cylinder 7 from the amount of movement of the stopper 11. When the calculated stop position matches the value converted by the conversion circuit 28, the control circuit 29 commands the control valve 3.
0 stops, the rotation of the hydraulic motor 16 stops, and the electromagnetic brake 19 tightens the ring 19, causing the coupling 15 to stop moving. As a result, when the rod 8 of the mold clamping cylinder 7 moves in the mold opening direction when the movable platen 5 opens the mold, the conversion circuit converts the rod 8 at the stop position.
stops, and the mold opening stop position of the movable platen 5 becomes the set value.

In the device configured as described above, the mold opening stop position of the movable platen 5 can be set simply by inputting the setting value of the mold opening stop position of the movable platen 5 to the mold opening stop position setting section 27. Therefore, the mold opening stop position can be easily set in a short time. Further, unlike the conventional method, the mold opening stop position is not set by human senses, so the mold opening stop position can be set accurately. Furthermore, since there is no need to rely on manual labor to set the mold opening/stop position, mold setup work can be automated, and factories equipped with injection molding machines can be
It is effective in creating a curing system).

In the above embodiment, the stopper 11 is moved by the hydraulic motor 16, but the stopper may be moved by an electric motor or the like.

[Effects of the Invention] As explained above, according to the present invention, the mold opening stop position can be set simply by inputting the setting value of the mold opening stop position of the movable plate. You can easily configure settings in a short time.

In addition, since the operator does not have to manually set the mold opening stop position as in the past, it is possible to accurately set the mold opening stop position.

Furthermore, since settings do not require manual intervention, mold setup work can be automated, which is effective, for example, in converting a factory equipped with injection molding machines to FMS.

[Brief explanation of the drawing]

1 to 3 are diagrams showing one embodiment of the present invention, in which FIG. 1 is a side view of the main parts of an injection molding machine, FIG. 2 is a sectional view of the main parts of the mold opening stop position setting device, FIG. 3 is a diagram showing the relationship between the position of the rod of the mold clamping cylinder in the mold opening direction and the mold opening position of the movable platen. 2...Fixed plate, 5...Moveable plate, 6...
...Toggle link, 7...Mold clamping cylinder, 8
...Rod, tt...Stopper, 16
・・・・・・Hydraulic motor (stopper moving means), 26・
...Control device, K...Mold.

Claims (1)

[Scope of Claims] A mold clamping cylinder that moves a movable platen in a direction toward and away from a fixed platen via a toggle link when a rod is expanded or contracted, and opens and closes a mold between the movable platen and the fixed platen; In this mechanical mold opening stop position setting device, the mold clamping cylinder is provided with a stopper that regulates the stop position of the rod in the mold opening direction, and the stopper is moved to stop the rod of the mold clamping cylinder in the mold opening direction. When a set value of a stopper moving means for changing the position and a mold opening stop position of the movable plate is input, the set value is converted into a stop position of a rod of a mold clamping cylinder in the mold opening direction,
A mechanical mold opening stop position setting device comprising: a control device that controls the stopper moving means to move the stopper so that the rod stops at the converted stop position.