JPH11227011A - Ejection method of ejector of injection molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the ejection method of a novel ejector making the ejecting position of a molded product always constant without being affected by the shift or irreglarity of the opening position of a movable plate and capable of perfectly eliminating the taking-out trouble of a taking-out machine. SOLUTION: In the ejector 20 provided to a movable plate 12 and advancing an ejection member 22 at the opening position of the movable plate 12 to eject the molded product in a movable mold 13b, the ejection completing position based on a fixed plate 11 is preset with respect to the ejection member 22 and the position detector 25 based on the fixed plate 11 is provided to the ejection member 22 and the advance of the ejection member 22 is completed by the positional detection of the position detector 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for ejecting an ejector device for ejecting a molded product in a movable mold.

[0002]

2. Description of the Related Art As shown in FIG.
The movable plate 42 is advanced by the mold clamping cylinder device 43 to close the movable mold 44b with the fixed mold 44a provided on the fixed plate 41, and the molten resin material is injected to form a molded product. The movable platen 42 of the injection molding machine 40 is provided with an ejector device 45. After the molding is completed, the movable platen 42 is retracted to open the molding die 44, and by operating the hydraulic cylinder 46 of the ejector device 45, the projecting member 47 is formed. Is advanced by a predetermined distance, and the molded product in the movable mold 44b is protruded. Reference numeral 52 in the figure denotes a rack provided on the movable platen 42, and reference numeral 53 denotes a position detector such as an encoder for measuring the moving distance of the projecting member 47. The molded product protruding from the inside of the movable mold 44b is taken out of the mold by an attached take-out machine 48.

In this type of injection molding machine 40, the movable platen 42 (movable mold 44b) is provided with a rack 50 and a position detector 51 such as a potentiometer or an encoder as shown in FIG. The position control is performed by measuring the mold opening distance from the mold closing position,
A deviation of several mm (2 to 3 mm) may occur at the actual mold opening position. When a shift occurs in the mold opening position, the conventional ejector device 45 is configured such that the protruding member 47 advances a predetermined distance with respect to the movable platen 42 as described above. The protrusion position (that is, the take-out position of the take-out machine) fluctuates. Since the take-out machine 48 is installed at a fixed position of the molding machine 40, it cannot cope with the fluctuation of the take-out position, and trouble occurs in taking out the molded product.
Such a trouble at the time of removing the molded product may be a defect of the molded product in the case of a precision molded product such as an optical disc product, and must be avoided by all means.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above situation. In an injection molding machine, a molded product can be manufactured without being affected by a deviation or variation in a mold opening position of a movable platen. It is an object of the present invention to provide a new ejector device ejecting method in which an ejecting position is always fixed and a trouble in taking out the ejector can be completely eliminated.

[0005]

That is, according to the first aspect of the present invention, there is provided an ejector device provided on a movable plate, wherein a projecting member advances at a mold opening position to project a molded product in a movable mold. In the above, the projecting completion position with respect to the fixed plate is set in advance for the projecting member, and a position detector based on the fixed plate is provided in the projecting member, and the position of the projecting member is detected by detecting the position of the position detector. The present invention relates to a method of ejecting an ejector device of an injection molding machine, wherein the advance is completed.

According to a second aspect of the present invention, there is provided an ejector device which is provided on a movable platen so that a projecting member advances a predetermined moving distance at a mold opening position to project a molded product in a movable side mold. In the movable platen, a mold opening position based on a fixed platen is set in advance, and the movable platen is provided with a position detector based on the fixed platen, and the position detector detects an actual mold opening position of the movable platen. And the difference between the set mold opening position and the actual mold opening position is determined, and the value of the difference is added to or subtracted from the moving distance set for the projecting member, and the projecting member is moved forward. The present invention relates to a method for ejecting an ejector device of an injection molding machine, wherein a power distance is calculated and advance of the projecting member is completed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a plan view schematically showing an injection molding machine according to an embodiment of the present invention, FIG. 2 is a schematic view of a main part showing a projecting completion position of a projecting member in FIG. 1, and FIG. FIG. 4 is a plan view schematically showing an injection molding machine showing one embodiment of the present invention, and FIG. 4 is a schematic view of a main part showing a projecting completion position of a projecting member in FIG.

The injection molding machine 10 shown in FIGS.
, Reference numeral 11 denotes a fixed plate, 12 denotes a movable plate, 13 denotes a pair of molding dies, 13a denotes a fixed-side die, 13b denotes a movable-side die, 14 denotes a tie rod, and 15 denotes a movable plate 12 that moves forward and backward. The mold clamping cylinder 16 is a cylinder board.
Reference numeral 17 denotes a position detector such as an encoder provided on the movable platen 12, and 18 denotes an injection molding machine (here, the cylinder plate 16).
A rack 19 fixedly mounted on the injection molding machine (here, the fixed platen 11) is a molded product taking-out device fixedly mounted. Reference numeral 20 denotes an ejector device provided on the movable plate 12, reference numeral 21 denotes a hydraulic cylinder thereof, and reference numeral 22 denotes a hydraulic cylinder 21.
Is a protruding member for a molded product which is moved forward and backward by the operation.

First, the method of claim 1 will be described.
As shown in FIG. 1 and FIG. 2, the projecting method of the first aspect relates to the projecting member 22 of the ejector device 20.
A projecting completion position P based on the fixed platen 11 is set in advance, and a position detector 25 based on the fixed platen 11 is provided on the projecting member 22. 22 is completed.

That is, the ejector device 2 of this embodiment
0, as shown in FIG.
By moving along a rack 18 fixed to the cylinder board 16, the position of the fixed board 11 can be detected. In addition,
In this embodiment, the position of the fixed plate 11 is detected by a rack 18 fixed to the cylinder plate 16 for the convenience of the molding operation.
Needless to say, it may be provided to the user.

Referring to FIG. 2 in more detail,
(2A), (2B) and (2C) in FIG. 2 show different mold opening positions N, N1 and N2 of the movable platen 12. (2A) in the upper part of the figure is a state where the movable platen 12 has stopped at the predetermined mold opening position N. The projecting member 22 is located at the projecting completion position P at a distance k1 with respect to the predetermined fixed platen 11.
To complete the advance. In this case, specifically, the projecting member 2
The second position detector 25 stops at a predetermined position R of the rack 18.

The middle part (2B) of FIG. 2 shows a position N1 in which the movable platen 12 is closer to the fixed platen 11 in front of a predetermined mold opening position N.
In a stopped state. In the drawing, the state is exaggerated for convenience of explanation. In this state, movable plate 1
2 is stopped, the projecting member 22 remains at the projecting completion position P (the projecting member 22
The forward movement is completed at the position R) of the rack 18 of the position detector 25. Similarly, (2C) at the bottom of FIG. 2 shows a state where the movable platen 12 has stopped at a rear position N2 from a predetermined mold opening position N. This (2C) position is also exaggerated. This rear position N
2, when the movable platen 12 is stopped,
In No. 2, the forward movement is completed at a projecting completion position P (the position R of the rack 18 of the position detector 25 of the projecting member 22) with respect to the predetermined fixed board 11 as a reference.

As can be seen from the above description, this claim 1
In the present invention, the projecting member 22 of the ejector device 20
Is determined in advance with reference to the fixed platen 11, and regardless of the mold opening position of the movable platen 12, the unique position of the protruding member 22 is detected to control the protruding completion position. Thereby, the forward completion position P of the protruding member 22 of the ejector device 20 is fixed, so that the take-out position by the take-out device 19 does not change, and it is possible to eliminate all troubles in taking out.

Next, the method according to the second aspect of the present invention will be described. In this method, the advance completion position P of the projecting member 22 of the ejector device 20 is fixed by changing the software using the above-mentioned conventional device. Is what you can do. That is, as shown in FIGS. 3 and 4,
The ejector device according to claim 2, wherein the projecting member (22) is provided on the movable platen (12) to advance the molded product in the movable mold (13b) at a mold opening position by advancing a predetermined moving distance (S). 20. In the injection molding machine 10A of the present invention, a mold opening position M of the movable platen 12 with respect to the fixed platen 11 is set in advance, and the movable platen 12 has a position detector 1 with respect to the fixed platen 11.
7, the position detector 17 detects the actual mold opening positions M1, M2 of the movable platen and the difference g between the set mold opening position M and the actual mold opening positions M1, M2.
1, g2, and adding or subtracting the value of the difference to or from the moving distance S set for the protruding member 22,
The distances S1 and S2 to be advanced are calculated and the projecting member 2
2 is completed.

Referring to FIG. 4 in more detail,
(4A) in the upper part of FIG. 4 shows a state where the movable platen 12 has stopped at the predetermined mold opening position M. The protruding member 22 is configured to advance by a predetermined moving distance S at the mold opening position M and to complete the advance at a protruding completion position Q at a fixed distance k2 from the fixed platen 11. In this case, specifically, the rack 18a of the position detector 25 of the projecting member 22
At the predetermined position T.

The middle part (4B) of FIG. 4 shows a position M1 where the movable platen 12 is closer to the fixed platen 11 in front of a predetermined mold opening position M.
In a stopped state. It is to be noted that, in the figure, the state is shown in an exaggerated state for convenience of explanation, as in the above-described example. Here, the position detector 1 provided on the movable plate 12
7, the actual mold opening position M1 of the movable platen is detected, and the difference g1 (M1-M) between the set mold opening position M and the actual mold opening position M1 is obtained. Then, the value of the difference g1 is set to the moving distance S set for the protruding member 22.
Then, the distance S1 to which the protruding member 22 is to be advanced is calculated, and the advance of the protruding member 22 is completed. In the case where the movable platen 12 stops at the position M1 near the fixed platen 11 in front of the predetermined mold opening position M as in this example, the distance S1 to which the protruding member 22 should move forward is equal to the set forward distance S.
Is subtracted (S-g1). As a result, the projecting member 22 is positioned at the projecting completion position Q (the rack 18 of the position detector 25 of the projecting member 22) with respect to the predetermined fixed platen 11.
The advance is completed at a position T1).

On the other hand, (4C) at the bottom of FIG.
The movable platen 12 is stopped at a rear position M2 from a predetermined mold opening position M. This (4C) position is also exaggerated.
When the movable platen 12 stops at the rear position M2, similarly to the above, the set mold opening position M and the actual mold opening position M2
And the difference g2 (M−M2) is obtained. And movable plate 12
Is stopped at the rear position M2 from the predetermined mold opening position M, the value of the difference g2 is added to the moving distance S set for the protruding member 22, and the distance S1 ( S + g2) is calculated, and the forward movement of the protruding member 22 is completed. Also in this case, after all, the protruding member 22 completes its advance at the protruding completion position Q (the rack 18a position T2 of the position detector 25 of the protruding member 22) with respect to the predetermined fixed platen 11.

According to a second aspect of the present invention, as described above, the predetermined forward distance S of the protruding member 22 set on the basis of the movable platen 12 is set according to the actual stop position of the movable platen 12. The displacement g1 and g2 of the ejector device 20 are corrected, so that the forward completion position Q of the projecting member 22 of the ejector device 20 is fixed. The method according to the second aspect of the present invention has an advantage that it can be carried out by changing the control software using the apparatus and the instrument according to the conventional ejection method shown in FIG.

In the embodiments of the first and second aspects of the present invention, the rack 18 for detecting the position is provided on the cylinder board 16 and the position is measured based on the distance measured from the cylinder board 16. But this is rack 1
This is due to the convenience of the installation of the rack 18, which is troublesome in the molding operation when the 8 is installed on the fixed board 11 side. Since the distance between the fixed board 11 and the cylinder board 16 is constant, it is needless to say that the distance from the cylinder board 16 can be converted as a distance based on the fixed board 11.

[0020]

As shown and described above, according to the ejecting method of the ejector device of the present invention, the injection molding machine is not affected by the deviation or variation of the mold opening position of the movable plate, and the molded product is not affected. Keep the protrusion position constant,
It is possible to completely eliminate trouble in taking out the unloader.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing an injection molding machine according to an embodiment of the present invention.

FIG. 2 is a schematic view of a main part showing a projecting completion position of a projecting member of FIG. 1;

FIG. 3 is a plan view schematically showing an injection molding machine according to an embodiment of the present invention.

FIG. 4 is a schematic view of a main part showing a projecting completion position of a projecting member of FIG. 3;

FIG. 5 is a plan view schematically showing a conventional injection molding machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Injection molding machine 11 Fixed side mold 12 Movable side mold 13 Mold 16 Cylinder board 18 Rack 20 Ejector device 22 Projection member 25 Position detector P, Q Projection completion position N, N1, N2 Opening position R of movable plate The forward completion position of the protruding member M, M1, M2 The mold opening position of the movable plate T, T1, T2 The forward completion position of the protruding member

Claims (2)

[Claims] 1. An ejector device provided on a movable plate, wherein a protruding member moves forward at a mold opening position to protrude a molded product in a movable die, wherein a projecting completion position of the protruding member with respect to a fixed platen. And a position detector is provided on the protruding member with reference to a fixed platen, and the position of the position detector is detected to complete the advance of the protruding member. Ejecting method of ejector device. 2. An ejector device provided on a movable plate, wherein a protruding member advances at a predetermined moving distance at a mold opening position to project a molded product in a movable mold, wherein the movable plate is fixed. A mold opening position based on the board is set in advance, and the movable board is provided with a position detector based on the fixed board, and the position detector detects an actual mold opening position of the movable board and is set. The difference between the mold opening position and the actual mold opening position is obtained, and the value of the difference is added to or subtracted from the moving distance set for the projecting member to calculate a distance to which the projecting member is to be advanced, A method of ejecting an ejector device for an injection molding machine, wherein the advancement of the projecting member is completed.