JPH05286001A - Method and device for confirming advancing limit position of protruding plate in mold in electrically-driven injection molding machine - Google Patents

Abstract

PURPOSE:To prevent damage to a mold due to setting mistake of an operator and thereby greatly relieve work of the operator by storing in a control device a stop position where a protruding plate in a mold stops advancing. CONSTITUTION:A protruding plate 7 in a movable side mold 4 is advanced by driving a motor 11 at a low speed so that an advancing limit position of the plate 7 can be confirmed. When an advancing limit position automatic setting switch 33 is depressed at a mold open completion position after a mold 4 is mounted, the motor 11 is turned forwardly at a low speed and low torque. And when the plate 7 contacts the inner surface of the mold and reaches an advancing limit position, changes in output of a rotation detector 10 does not occur and hence it is detected that the motor 11 has stopped. After confirming the stop position of the plate 7, a position several millimeters in advance of said stop position, i.e., a position a proper distance in advance of the stop position, is stored in a control device 31 as an advancing limit position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for confirming a protrusion advance limit position of a protrusion plate in a mold in an electric injection molding machine, and more particularly to a new improvement for automatically storing the protrusion advance limit position. ..

[0002]

2. Description of the Related Art Conventionally, as a method for confirming the projection forward limit position of a projecting plate in a mold in this type of electric injection molding machine, generally, with the mold opened, the motor is operated at low speed and low torque. While driving and visually confirming, the ejector rod advances the in-mold projecting plate to determine an appropriate position (minus a few millimeters from the time of contact) before the in-mold projecting plate contacts the inner surface of the mold, The controller set that value as the protrusion forward limit position.

[0003]

Since the conventional method for confirming the protruding forward limit position of the in-mold projecting plate in the electric injection molding machine is configured as described above, the following problems exist. In other words, the operator must closely observe the movement of the die, and if he accidentally performs work with high torque, the die will be damaged, making it extremely difficult for the operator. It was a lot of work.

The present invention has been made to solve the above problems, and in particular, the protrusion advance limit of the protrusion plate in the mold in the electric injection molding machine that automatically stores the protrusion advance limit position. It is an object to provide a position confirmation method and device.

[0005]

According to the method for confirming the protrusion advance limit position of the in-mold protruding plate in the electric injection molding machine according to the present invention, the in-mold protruding plate in the movable side mold is advanced by the low speed driving of the electric motor. In the method of confirming the projection forward limit of the projection plate inside the mold in the electric injection molding machine for confirming the projection forward limit position of the projection plate inside the mold, the stop position at which the forward movement of the projection plate inside the mold is stopped. This is a method of storing in the control device.

More specifically, it is a method of storing a front position, which is an appropriate amount before the stop position, as a protrusion forward limit position in the control device.

The in-mold protruding plate in the electric injection molding machine is arranged so that the in-mold protruding plate in the movable-side mold is moved forward by low-speed driving of the electric motor and the protruding forward limit position of the in-mold protruding plate is confirmed. The protrusion forward limit position confirmation device includes a rotation detector provided on the electric motor and a control device connected to the electric motor and the rotation detector.

[0008]

In the method and apparatus for confirming the protrusion advance limit position of the protrusion plate in the mold in the electric injection molding machine according to the present invention, when the protrusion advance limit position automatic setting switch is pressed at the mold opening completion position after mounting the mold. , When the electric motor operates at the low speed and low torque (pressure) on the forward side and the projecting plate inside the mold contacts the inner surface of the mold and reaches the projecting forward limit position, the output of the rotation detector changes when the motor stops. It is detected when it disappears.

After confirming the stop position of the in-mold projecting plate, a minus several millimeters from this stop position, that is, a front position which is an appropriate amount before, is stored in the control device as the protrusion forward limit position. Therefore, the protruding forward limit position is displayed by the display unit and the in-mold protruding plate is automatically stopped at this position, so that damage to the mold or the like due to a setting error or the like can be prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a method and apparatus for confirming the projection forward limit position of a projection plate in a mold in an electric injection molding machine according to the present invention will be described in detail below with reference to the drawings. 1 and 2 show a device for confirming a protruding forward limit position of a protruding plate in a mold in an electric injection molding machine according to the present invention. FIG. 1 is an overall configuration diagram, and FIG. 2 shows an operation of a main part of FIG. FIG.

In FIG. 1 and FIG. 2, the reference numeral 1 designates a fixed plate having a fixed mold 2 and the fixed plate 1
4 tie bars 3 provided on the (only two shown in the figure)
The movable platen 5 having the movable mold 4 is configured to be reciprocally movable in the direction of arrow A.

A plurality of eject pins 6 are provided in the movable mold 4 so as to be able to move in and out, and each of these eject pins 6 is located inside a recess 4a formed in the movable mold 4. A spring member 8 made of a spring is planted in the projecting plate 7, and at the outer peripheral position of each eject pin 6 and between the projecting plate 7 inside the mold and the mold inner surface 6a of the movable side mold 4. It is installed.

The mounting member 9 provided on the outer side portion 5a of the movable plate 5 is provided with an electric motor 11 composed of a servo motor having a rotation detector 10 composed of a rotary encoder or the like, and a side face 5b of the movable plate 5 is provided. Is four guide bars 12
A casing 13 is provided via (only two are disclosed in the drawing).

A first ball nut 15 is rotatably mounted on the casing 13 via a bearing 14, and the first ball nut 15 is rotatably mounted on the casing 13.
A belt 18 is provided between the ball nut 15 and the pulley 17 provided on the rotary shaft 16 of the electric motor 11.

The first ball screw shaft 19 screwed on the ball nut 15 is provided movably through the guide rods 12 and has an ejector rod 21 for ejector plate 2.
0, the ejector rod 21 is configured to penetrate the through hole 5c of the movable plate 5 and come into contact with the in-mold projecting plate 7.

A fixed body 22 is fixed to an end portion 3a of each tie bar 3, and a shaft body 23 provided on the fixed body 22 is fixed.
To the second ball screw shaft 2 through the second ball nut 24.
5 is provided so that it can freely move in and out. A transmission belt 29 is provided between a pulley 26 provided on one end 25 a of the second ball screw shaft 25 and a pulley 28 of a mold clamping motor 27 provided on the fixed body 22.

The other end 25b of the second ball screw shaft 25 is connected to a mold clamping mechanism 30 connected to the movable plate 5, and the rotation of the mold clamping motor 27 causes the second ball screw shaft 25 to move in and out. The movable platen 5 can be reciprocated in the direction of arrow A via the mold clamping mechanism 30.

The electric motor 11 and the rotation detector 10 are connected to a control unit 31 having a storage unit 32, and the control unit 31 is provided with a display unit 34 having a protrusion forward limit position automatic setting switch 33. ..

Next, a description will be given of the case of actually confirming the protruding forward limit position of the in-mold projecting plate in the above-mentioned configuration. First, after the respective molds 2 and 4 are mounted, the motor 11 is driven at a low speed and low torque (pressure) by pressing the protrusion forward limit position automatic setting switch 33 of the setting display section 34 in the mold opening completion state shown in FIG. To start rotating. The rotation of this electric motor 11 is
Driving pulley 17, belt 18, and driven pulley 15a
The ball nut 15 is rotated through the ball nut 15, and the rotation of the ball nut 15 causes the first ball screw shaft 19 to start moving forward (to the right in FIG. 1).

After that, when the ejector plate 20 and the ejector rod 21 move forward in the same direction and push the in-mold projecting plate 7 in the same direction, each eject pin 6 is moved outside the movable mold 4 as shown in FIG. Begins to stick out. When the in-mould projecting plate 7 compresses each spring member 8 and makes close contact with the inner surface 6a of the mold, the electric motor 11 becomes unrotatable, and the in-mould projecting plate 7 comes to the stop position and the pulse from the rotation detector 10 is reached. Since the rotation detection signal 10a composed of a signal is lost, this state is stored in the storage unit 32 of the control device 31 as the stop position.

After that, the electric motor 11 is rotated in the reverse direction to store in the storage section 32 a frontward position which is an appropriate amount before the stop position, that is, a protruding forward limit position which is minus a few millimeters (retracted) from the stop position, and is set and displayed. 34 is displayed.

Therefore, after the projection forward limit position is stored and displayed, even when the in-mold projecting plate 7 is advanced through the electric motor 11 to set the projection forward limit position, The setting exceeding the protrusion forward limit position is restricted by the storage unit 32 in the control device 31, and safe operation can be performed.

[0023]

Since the method and apparatus for confirming the protruding forward limit position of the in-mold protruding plate in the electric injection molding machine according to the present invention is configured as described above, the following effects can be obtained. That is, it is possible to automatically set the protrusion forward limit position of the protrusion plate in the mold by operating the electric motor at low speed and low torque (pressure), so that a mold damage accident due to an operator's setting mistake, etc. Not only can it be prevented, the conventional visual setting work becomes unnecessary,
The work of the operator can be greatly reduced.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a protrusion forward limit position confirmation device of a protrusion plate in a mold in an electric injection molding machine according to the present invention.

FIG. 2 is a cross-sectional view showing a main part of FIG.

[Explanation of symbols]

 4 Movable mold 7 Projecting plate in mold 10 Rotation detector 11 Electric motor 31 Controller

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29C 45/84 7365-4F

Claims (3)

[Claims] 1. A movable-side mold by low-speed driving of an electric motor (11)
(4) The in-mold protruding plate (7) is moved forward to advance the in-mold protruding plate.
(7) in the projection forward limit position confirmation method of the in-mold protruding plate in the electric injection molding machine to confirm the protruding forward limit position, the stop position where the advance of the in-mold protruding plate (7) has stopped A method for confirming a protrusion advance limit position of a protrusion plate in a mold in an electric injection molding machine, which is stored in a control device (31). 2. A mold for an electric injection molding machine according to claim 1, wherein a front position that is an appropriate amount before the stop position is stored in the control device (31) as the protrusion advance limit position. How to confirm the protruding forward limit position of the protruding plate. 3. A mold which is movable by low speed driving of an electric motor (11)
(4) The in-mold protruding plate (7) is moved forward to advance the in-mold protruding plate.
(7) In the projection forward limit position confirmation device of the in-mold projecting plate in the electric injection molding machine for confirming the projection forward limit position, the rotation detector (10) provided in the electric motor (11)
And a controller (31) connected to the electric motor (11) and the rotation detector (10), and detects the stop position of the in-mold protruding plate (7) by the rotation detector (10). A device for confirming the protruding forward limit position of a protruding plate in a mold in an electric injection molding machine, characterized in that