JP2000309037A - Mold attaching device for injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold attaching device not applying unreasonable force to a mold locating device when a movable mold is closed while corrected in axial shift by the mold locating device, not loading the mold locating device with distortion acting on the movable mold and enabling the automatic alignment of the movable mold. SOLUTION: A mold attaching device is equipped with equilibrium guide means 40, 50 (50a, 50b) for applying pre-load to an aligning surface plate 31 to which a movable mold 2 is attached to support the plate 31 at an aligning position and a position display means 70 displaying the position of the aligning surface plate 31 and, especially, an equilibrium adjusting device 60 is added to at least a lower vertical equilibrium means 50b. The aligning surface plate 31 is guided by a horizontal and vertical guide means to be supported by an equilibrium means. The aligning surface plate 31 consists of first and second aligning surface plates and these aligning surface plates are supported by the equilibrium means to be guided by the guide means. A position detecting means and an automatic vertical equilibrium control means are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold mounting apparatus for mounting a mold of an injection molding machine, and more particularly to centering the center of a movable mold with the center of a fixed mold and moving the center of the center of the movable mold. The present invention relates to a mold mounting apparatus for an injection molding machine that preloads a movable mold as much as possible and holds the movable mold in an equilibrium state.

[0002]

2. Description of the Related Art A mold clamping device of an injection molding machine includes at least a fixed platen for attaching a fixed mold and a movable platen for attaching a movable mold. The movable platen advances and retracts, that is, opens and closes with respect to the fixed platen. The mold is opened and closed and the mold is closed. Then, a resin material is filled from an injection device into a cavity formed between the closed movable mold and the fixed mold to form a molded product.

When a molding operation is started, a resin material melted at a high temperature is injected into a mold every molding cycle, and the mold temperature rises. Therefore, the mold itself is cooled by circulating cooling water through the mold (temperature control), and an insulating plate is inserted between the mold and the platen to stabilize the temperature of the mold itself and the platen. Is usually performed. But,
The temperatures of the platen and the mold are different between the state when the mold is mounted and the state after the start of operation, and since the temperatures of the two change over time, the centers of the two shift. This misalignment is caused by a difference in the amount of thermal displacement due to a difference in the structure or material of the platen or the mold, but also occurs when the ambient temperature changes. As described above, in the mold clamping device, the center position of the platen or the mold is often slightly misaligned.

In order to correct a slight misalignment of the mold, a mold positioning device is usually built in the mold.
The mold positioning device is, for example, one in which a guide pin is implanted on the movable mold side and a guide bush is inserted into a fixed mold, or one in which a tapered guide convex portion and a concave portion are provided. It is. By inserting and positioning such mold positioning devices, the molds are closed with their centers aligned. However, if the molding operation is continued while correcting the misalignment as described above in a state where the mold is firmly fixed to the platen, for example, in the case of the combination of the guide pin and the guide bush, the guide pin is always attached to the guide bush. As a result, the guide pin and the guide bush are worn early. As a result, the mold positioning device for the movable mold and the fixed mold becomes loose, the centers of both molds are misaligned, and the centers of two opposing surfaces of the molded article are misaligned. This greatly deteriorates the quality of a precision molded product, for example, a fine connector or lens to be precisely molded.

[0005] Japanese Utility Model Publication No. 5-19145 discloses that a convex portion is formed on a mold installation surface of a molding machine and a concave portion is formed on a mold so that the center of a movable mold thermally expands with reference to the center of a movable platen. A mold positioning device has been proposed in which a protrusion and a recess are provided so as to coincide with and intersect with the center of the mold. According to this, since the mold thermally expands with reference to the center of the platen, misalignment does not occur between the movable platen and the movable mold. In addition, Japanese Patent Application Laid-Open No.
No. 0914 proposes a mold positioning mechanism for a similar purpose, in which a movable mold thermally expands with reference to the center of a movable platen.

Japanese Patent Laid-Open Publication No. Hei 1-204708 discloses that one cavity block is centered on the basis of another cavity block, and when the centering is corrected and centering is performed, a relative position is determined in the vicinity of the position. 2. Description of the Related Art There has been proposed a molding die capable of being displaced. The cavity block is pressed against the cavity block base with a desired pressing force by a set bolt containing a spring, and is movably fixed to the cavity block base by the surface friction force generated by the pressing force.

[0007]

However, in the former configuration, since the center of the mold is immovably positioned at the center of the platen, when the movable platen is misaligned with respect to the fixed platen, the movable mold is displaced. The same misalignment occurs between the mold and the fixed mold, and an excessive force is applied to the mold positioning device. This misalignment of the platen often occurs, particularly in a horizontal clamping device. This is because the horizontal mold clamping device has a different mounting structure of the fixed platen and the movable platen with respect to the machine base, and therefore has different thermal expansion amounts based on the machine base.
Further, even in the rotary type vertical mold clamping device, the platen side which rotates around the rotary shaft thermally expands in one direction with respect to the shaft. Therefore, particularly in such a mold clamping device, there is a problem that the guide pin and the guide bush are worn as described above, and the mold misalignment due to this is inevitable.

[0008] The latter configuration is also to be adopted in a vertical mold clamping device and is difficult to adopt in a horizontal mold clamping device. In the horizontal mold clamping device, the surface friction force between the cavity block and the cavity block base is set to be equal to or greater than the weight of the cavity block so that the cavity block is not displaced by its own weight during opening and closing of the mold. , The set bolts must be tightened. In addition, when the cavity block is misaligned, there is no restoring means for restoring the misalignment to the original position. For this reason, the tightening force of the set bolt must be increased with a margin, and the surface friction force must be equal to or greater than the weight of the cavity block. As a result, when one of the cavity blocks is positioned and moved by the other cavity block, this large force is required, and this force acts on the positioning member, and an excessive force is applied to the positioning member.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and by supporting a movable mold at a pre-aligned position in an equilibrium state and supporting the movable mold, the movable mold is small near the centering position. A mold mounting device for an injection molding machine that is held movably by an external force and prevents an excessive force from being generated in the mold positioning device when the movable mold is closed while correcting misalignment by the mold positioning device. The purpose is to provide. It is another object of the present invention to provide a mold mounting device for an injection molding machine that prevents an excessive force from being generated in a mold positioning device even if a twist is applied to the movable mold when the movable mold is closed. Still another object of the present invention is to provide a mold mounting device for an injection molding machine in which a movable mold is automatically centered.

[0010]

In order to achieve the above-mentioned object, a mold mounting device for an injection molding machine according to claim 1 is positioned on a fixed mold (11) by a mold positioning device (20). In a mold mounting device of an injection molding machine for mounting a movable mold (12) to a movable platen (2), an aligning face plate (31) for mounting a movable mold (12);
(32) and (33) are replaced with centering springs (42) and (14)
2), (242), (52), (152), (25)
2) and (301) are characterized in that they are pre-pressed and supported in equilibrium in the horizontal and vertical directions.

According to a second aspect of the present invention, there is provided a mold mounting apparatus for an injection molding machine, wherein a movable mold (12) positioned on a fixed mold (11) by a mold positioning apparatus (20) is moved to a movable platen (11). In the mold mounting device of the injection molding machine to be mounted on 2), the centering face plate (3) on which the movable die (12) is mounted.
Horizontal equilibrium guide means (40) for movably guiding 1) on the mold mounting surface of the movable platen (2), and preloading and supporting the equilibrium state from both sides in the horizontal direction by means of an aligning spring (42). And guide the aligning face plate (31) movably on the mold mounting surface of the movable platen (2),
A vertical balance guide means (50) for vertically preloading and supporting the centering spring (52) in an equilibrium state from above and below, and two positions for displaying the horizontal and vertical positions of the centering face plate (31). Display means (70).

According to a third aspect of the present invention, the movable mold (12) positioned on the fixed mold (11) by the mold positioning device (20) includes a movable platen (12). In the mold mounting device of the injection molding machine to be mounted on 2), the centering face plate (3) on which the movable die (12) is mounted.
1) for guiding the movable platen (2) horizontally and vertically on the mold mounting surface of the movable platen (2), and the centering face plate in the horizontal direction by the centering spring (142). A horizontal balancing means (140) for preloading and supporting in an equilibrium state from both sides;
52) vertical equilibrium means (150) for vertically preloading and supporting equilibrium from above and below in the vertical direction, and an aligning face plate (31)
Position display means (170) for displaying horizontal and vertical positions with respect to the movable platen (2).
And the following.

According to a fourth aspect of the present invention, there is provided a mold mounting device for an injection molding machine, wherein a movable mold (12) positioned on a fixed mold (11) by a mold positioning device (20) is moved to a movable platen (11). A first aligning face plate (32) to which a movable mold (12) is attached while being guided so as to be movable in one of a horizontal direction and a vertical direction, in a mold attaching device of an injection molding machine attached to 2); A second aligning face plate (33) interposed between the centering plate (32) and the movable platen (2) and guided movably in a direction orthogonal to the moving direction of the first aligning face plate (32); Guide means (280) for movably guiding the first aligning face plate (32) and the second aligning face plate (33) on the mold mounting surface of the movable platen (2), and the first aligning face plate (3).
2) The first balancing means (240) for preloading and supporting the two sides in an equilibrium state only in one horizontal or vertical direction by the centering spring (242), and the second centering face plate (33). A second equilibrium means (250) for preloading and supporting equilibrium from both sides in a direction orthogonal to the moving direction of the first centering face plate (32) by a spring (252);
And (2) two position display means (270) for displaying the horizontal and vertical positions.

According to a fifth aspect of the present invention, there is provided a mold mounting device for an injection molding machine according to the second or fourth aspect of the present invention, wherein at least a vertically lower balancing means (50b) is provided. Or (150b) or (250
b) is provided with a balance adjusting means (60) or (160) or (260) for adjusting the spring force of the centering spring (52b) or (152b) or (252b).

According to a sixth aspect of the present invention, there is provided the mold mounting apparatus for an injection molding machine according to any one of the second to fourth aspects, wherein at least the vertical position display means (70) or ( 170) or (270), a position detecting means (290) for detecting the position of the centering face plate (31) or (32) is provided, and the balance adjusting means (6) is provided.
0), (160) and (260), an automatic vertical balance control means (300) for automatically adjusting the spring force of the centering spring (301) based on the position data measured by the position detection means (290). It is characterized by having. Note that the reference numerals in parentheses described above are for convenience of indicating elements corresponding to the drawings, and the present description does not limit the present invention to the description examples on the drawings.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The mold mounting apparatus of the present invention guides an aligning face plate on which a movable mold is mounted on a movable platen by a guide means and supports the centering plate by a balancing means, or has a dual function. The centering face plate is pre-pressed and supported in an equilibrium state at a pre-centered centering position by supporting the centering plate by means of a balanced guide means, and the movable mold is held movably with a small external force near the centering position. Is what you do.

A mold mounting apparatus according to a first embodiment of the present invention will be described with reference to FIGS. 2 shows an example employed in a horizontal mold clamping device. FIG. 1 is a side view partially showing a state in which the mold mounting device and the mold are mounted on the mold clamping device. FIG. 2 is a left side view of the mold mounting device and the mold of FIG. FIG. 3 is a plan view of FIG. 1 as viewed from above. FIG. 4 is a detailed view of the vertical balance guiding means and the balance adjusting means described below, and FIG. 5 is a detailed view of the position display means.

The mold clamping device includes a fixed platen 1 as shown in FIG.
And a movable platen 2. The movable platen 2 is guided by a tie bar 3, and is opened and closed with respect to the fixed platen 1 by a mold clamping device (not shown) so that the movable platen 2 can be clamped. The mold 10 has various configurations depending on the molded product, but a mold having the simplest two plates, that is, a mold having a fixed mold 11 and a movable mold 12 is exemplified. The fixed mold 11 is attached to a fixed mold mounting plate 13 having a locate ring 15, and the movable mold 12 is
It is mounted on the movable mold mounting plate 14. The mold positioning device 20 includes a guide pin 21 and a guide bush 22. Closed movable mold 12 and fixed mold 1
3, a cavity 18 is formed, and the cavity 18 is filled with molten resin from an injection device (not shown) via a spool bush 16 and a runner 17. Then, the cooled molded product and the runner are ejected by the ejector 19 after the mold is opened. In addition,
Normally, a heat insulating plate is mounted between the centering face plate 31 and the movable mold mounting plate 14, but is not shown.

The centering face plate 31 is a flat plate having a size on which the movable mold mounting plate 14 can be mounted.
A tap hole 31b for attaching a mold is formed in 1a in the same manner as the mold attaching surface of the conventional movable platen 2. Further, at least two positions of the aligning face plate 31 are provided with bolt holes 31c of the lock bolts 39 for temporarily fixing the aligning face plate 31 to the movable platen 2, so that the hole diameter is sufficiently larger than the bolt diameter of the lock bolt 39. Is formed. Lock bolt 39
Is inserted, the centering face plate 31 can be moved with respect to the movable platen 2.

On the mold mounting surface 2a of the movable platen 2, horizontal equilibrium guide means 40 are arranged on the left and right sides so as to surround the centering face plate 31, and on the upper side, a vertical equilibrium guide means 50a similar to the horizontal equilibrium guide means 40 is provided. Are arranged, and the vertical balance guide means 50b is arranged on the lower side.

The vertical equilibrium guide means 50a and 50b are provided in FIG.
As shown in FIG. 5, at least a bracket 51 formed on the mold mounting surface of the movable platen 2 and having an L-shaped cross section, and an aligning spring 52 mounted between the bracket and the aligning face plate 31 are provided. Have. The tongue piece 51a of the bracket 51 movably holds the aligning face plate 31 on the movable platen 2 in a state where there is almost no gap (a gap of about 0.01 mm). Then, the bracket 51 is arranged with a gap at least equal to the thermal expansion allowance with respect to the centering face plate 31 so that the bracket 51 and the centering face plate 31 do not interfere with each other even when thermally expanded. . A counterbore 51c is formed in the base 51b of the bracket 51 to stably accommodate the centering spring 52 and to allow a sufficient amount of shrinkage of the centering spring 52. This counterbore 5
1c is formed to have a diameter sufficiently larger than the centering spring 52.

Each of the centering springs 52 is a compression coil spring having the same spring constant. Of course, the centering face plate 31
In order to balance with the total weight of the movable mold 12 and the like,
The spring constant of the lower centering spring 52 can be increased. This spring is designated as 52b. Further, a balance adjusting means 60 for adjusting the pressing force of the centering spring 52b is incorporated in the lower vertical balance guide means 50b. The balance adjusting means 60 includes at least a push bolt 61 screwed into the bracket 51 and a seat plate 62. By adjusting the screwing amount of the push bolt 61, the centering spring is adjusted via the seat plate 62. The preload of the centering spring 52b against the centering face plate 31 is adjusted by adjusting the shrinkage margin of the centering spring 52b. 63 is a lock nut of the push bolt. With such a configuration, the centering face plate 31
Is preloaded from above and below by the centering springs 52 and 52b,
Particularly, the lower aligning spring 52b presses the movable mold 12 and the aligning face plate 31 excessively by an amount corresponding to the total weight of the movable mold 12 and the like, and the movable mold 12 is pre-loaded on the movable platen 2 in an equilibrium state. Supported. In a normal vertical mold clamping device other than the rotary vertical mold clamping device described above, the equilibrium adjusting means 60 may not be provided. This is because there is no need to balance the spring force with the own weight of the mold or the like as in the horizontal mold clamping device.
However, even in the case of a vertical mold clamping device, this is incorporated in the balance guide means 50 on one side, and the centering spring 52
May be configured so that the pressing force can be finely adjusted.

As shown in FIG. 3, the horizontal balance guide means 40 is constructed similarly to the vertical balance guide means 50, and includes a bracket 41 and an aligning spring 42 mounted between the bracket 41 and the aligning face plate 31. At least. The spring constants of the centering springs 42 of the horizontal balance guide means 40 on both sides are equal. However, the balance adjusting means 60 is not attached. With such a configuration, the centering face plate 31 is pre-pressed and supported in an equilibrium state on the movable platen 2 from the left and right sides, and the movable mold 12 is held at the center position. Usually, the balance adjusting means 60 is not required in the horizontal direction,
This may be incorporated in any one of the horizontal balance guide means 40 so that the preload of the one-sided centering spring 42 can be finely adjusted.

As described above, the centering face plate 31 is connected to the centering spring 4.
2 and / or 52 are pre-loaded in equilibrium from both sides, so that when the movable mold 12 is corrected for misalignment by the mold positioning device 20, the mold positioning device 20
The force borne by the vehicle is small. When the misalignment is corrected, the centering face plate 31 also moves, and the shrinkage or expansion allowance of the two centering springs symmetrically positioned around the centering face plate 31 changes. At this time, a restoring force for restoring the centering spring to the equilibrium position is applied. This restoring force is calculated by calculating the difference between the preload obtained by integrating the spring constant of each of the aligning springs and the shrinkage allowance at the time of initial mounting, and the spring allowance of each of the aligning springs and the shrinkage allowance or elongation allowance due to the above correction. However, since the spring force of the centering spring is adjusted in advance to be in an equilibrium state, and the difference in the preload of the former is almost zero, only the sum of the restoring force of the latter is eventually obtained. Becomes Moreover, since the amount of shrinkage or expansion of the spring due to the misalignment is very small, this restoring force is much smaller than the spring force necessary to balance the total weight of the centering face plate 31, the mold 10, and the like. Things.

As shown in FIGS. 2 and 5, the movable platen 2
One position indicating means 70 is provided on each of the vertical center line and the horizontal center line of the mold mounting surface. This position display means includes, for example, a length measuring device such as a dial gauge 71,
It comprises a bracket 72 for fixing this to the movable platen 2 side, and the tracing stylus 71a of the dial gauge 71 is arranged so as to abut on the end face of the centering face plate 31, and the position of the centering face plate 31 with respect to the movable platen 2 is displayed on the display unit. Is displayed. In the case where the display means 70 is not provided, the position of the centering face plate 31 or the movable mold 12 can be confirmed by attaching a dial gauge held by the user to the movable platen 2.

The mold 10 is mounted and aligned in the mold mounting apparatus having the above-described configuration as follows. The mold 10 has a fixed mold 11 and a movable mold 12 closed in advance, and the mold positioning device 20 aligns the two.
The centering face plate 31 is previously supported on the movable platen 2 by the horizontal balance guide means 40 and the vertical balance guide means 50a, 50b, and the centering state is confirmed by the position display means 70, and the centering state is achieved. Is temporarily fixed by a lock bolt 39. First, the mold 10 is attached.
Fix the locate ring 15 on the fixed mold 11 side to the fixed platen 1
The mold is closed in a state where it is aligned with the hole 1a, and the movable mold 12 side is attached to the centering face plate 31 at the same position. Next, when the lock bolt 39 of the centering face plate 31 is loosened,
The aligning face plate 31 is lowered by the total weight of the aligning face plate 31 and the mold and the like, and the display position of the vertical position display means 70 changes. The lowered misalignment amount is read, and the push bolt 61 of the balance adjusting means 60 is pushed up to reduce the misalignment amount by 0.1.
The spring force of the centering spring 52b is temporarily adjusted to be within about mm. Next, this adjustment is further continued while the mold 10 is opened, and the mold 10 is completely opened (the position of the guide pin 2).
The approximate adjustment is completed at the position where 1 has been completely removed, and the lock bolt 39 is removed. Then, the mold 10 is opened and closed several times, and fine adjustment is repeated, and the centering operation is completed so that the amount of misalignment of the position display means 70 falls within about 0.1 mm. Needless to say, if this readjustment is performed a predetermined number of times after the start of the molding operation, the centering adjustment can be performed more accurately.

The adjustment of the push bolt 61 described above can also be performed as follows. Since the spring constant of the centering spring 52b is selected in advance in consideration of the weight of the centering face plate 31 and the movable mold 12 that can be attached, the amount of rotation of the push bolt 61 and the centering spring 52b corresponding thereto are selected. The relationship with the spring force due to the shrinkage allowance is obtained in advance. Therefore, when the weight of the movable mold 12 to be attached is known, the push bolt 61 is screwed with a rotation amount according to the weight when the mold is opened.

Thus, the movable mold 12 which has been pre-aligned
Is pre-pressed in an equilibrium state from up, down, left and right by the spring force of the centering springs 52, 52b, is held at the centering position, is movable near the centering position with a relatively small force, and The centering position is not restricted by the center position of the movable platen 2. Therefore, when the center of the movable platen 2 and the center of the fixed platen 1 are slightly displaced, no excessive force is applied to the guide pin 21 and the guide bush 22 for correcting the misalignment, and these may be unnecessarily worn. Absent. Further, even if the center of the movable mold 12 is slightly misaligned during the operation such as opening and closing of the mold, the centering face plate 31 is restored by the restoring force of the centering spring. Return to nature.

Next, a mold mounting apparatus according to a second embodiment of the present invention will be described with reference to FIGS. 6 is a front view corresponding to FIG. 2, FIG. 7 is a side view of the balancing means and the position display means described below, which are arranged in the vertical direction, and FIG. 8 is a detailed view of the horizontal vertical guide means shown in a partial cross section. FIG. 9 is a side view of the balance means and the position display means arranged in the horizontal direction, and FIG. 10 is a detailed view of the balance means and the balance adjustment means arranged in the vertical direction.

As shown in FIGS. 6 and 8, the centering face plate 31 is supported by the horizontal vertical guide means 180 as follows. The horizontal / vertical guide means 180 includes a vertical positioning pin 1
81, a horizontal positioning pin 182, and a movable block 183, which are arranged above and below the centering face plate 31. Vertical positioning pins 181 are vertically implanted at both upper and lower end faces of the centering face plate 31, and horizontal positioning pins 182 are fixed to the bracket 151. And the vertical positioning pin 1
A movable block 183 into which the 81 and the horizontal positioning pin 182 are inserted in a state of being orthogonal at the twist position is movably arranged between the pins 181 and 182.
As a result, the centering face plate 31 is guided such that a gap between the centering face plate 31 and the movable platen 2 is about 0.01 mm. Of course, it is preferable to insert a metal bush or a ball bush into the movable block 183 so that the pins 181 and 182 move smoothly. Note that the horizontal / vertical guide means 180 is not limited to the illustrated configuration, and may be arranged such that the horizontal direction and the vertical direction are switched.

In the mold mounting apparatus of the second embodiment, the movable block 183 can be moved in the horizontal direction by the horizontal positioning pin 182, and the vertical positioning pin 181, ie, the centering face plate 31 is vertically moved by the movable block 183. It can move in any direction. Thus, the centering face plate 31 is guided on the movable platen 2 so as to be simultaneously movable in both the horizontal direction and the vertical direction without being restricted by the center position of the movable platen 2. In addition, even if the mold is twisted when the mold is closed, the horizontal and vertical guide means 180 can support this load. This is because the centering face plate 31 is simultaneously supported in the horizontal direction and the vertical direction by the positioning pins 181 and 182 and the movable block 183. Since the horizontal and vertical guide means 180 is arranged at a position away from the center of the centering face plate 31, this load does not become excessive.

As shown in FIGS. 9 and 10, the centering face plate 31 is provided with a horizontal balancing means 140 and vertical balancing means 150a and 150a.
0b, it is preloaded and supported in an equilibrium state as in the first embodiment. Each balancing means has a bracket 141 or 151 and an aligning spring 142 or 152 (152b), and supports the aligning face plate 31 in a horizontal direction and a vertical direction. Each bracket 141, 151 does not have a tongue piece like 51a, but is merely a centering spring 142, 152 (1
52b).
The balance adjusting means 160 similar to that of the first embodiment is incorporated in at least the lower vertical balancing means 150b. Also, one of the brackets 141 of the horizontal balancing means 140 and one of the brackets 151 of the vertical balancing means 150 are provided with the same position display means 170 as in the first embodiment. For these details and their effects,
Since the embodiment is equivalent to the embodiment, the corresponding reference numerals in the 100's are assigned and the detailed description thereof is omitted. In addition, as mentioned above, it is the same that the normal vertical clamping device does not need the balance adjusting means 60.

The mold 10 is the first in such a mold mounting apparatus.
It is mounted, aligned and held as in the embodiment. Thereby, not only the same operation and effect as in the first embodiment can be obtained, but also the following operation and effect can be obtained. For example, when the mold 10 is not symmetrical in terms of weight to the left or right, or when the mold temperature control piping or the like (not shown) is biased to one side, the twist is likely to occur when the mold is opened and closed, as described above. In addition, the twist is not applied to the positioning pins 181 and 182 and is not applied to the guide pin 21 and the bush 22.

Next, a mold mounting apparatus according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 11 shows FIG.
FIG. 12 is a detailed view of a vertically arranged balancing means, balance adjusting means and position display means described below, FIG. 13 is a detailed view of a guide means, and FIG. 14 is a horizontal view thereof. FIG. 4 is a detailed view of the balanced means and the position display means.

In this embodiment, as shown in FIGS. 11 and 12, the centering face plate is composed of a first centering face plate 32 and a second centering face plate 33. The first centering face plate 32 is a face plate to which a movable mold is attached, and the second centering face plate 33 is a face plate interposed between the first centering face plate 32 and the movable platen 2.
The first centering face plate 32 is located at a symmetrical position on the horizontal center line.
The long hole 32a is formed, and the second long hole 33a is formed at a symmetrical position on the vertical center line of the second centering face plate 33.
The first cam follower 34 is fixed to the upper surface of the second centering face plate 33 at a position where the first cam follower 34 fits in the first elongated hole 32a, and the second cam follower 35 is fitted to the upper surface of the movable platen 2 in the second elongated hole 33a. It is fixed to. Thus,
The first and second centering face plates 32 and 33 are movably guided by the first and second cam followers 34 and 35 in the direction of the respective long holes without play. Of course, the horizontal direction and the vertical direction may be switched. In addition, the guide is not limited to the combination of the long hole and the cam follower, but is guided in the horizontal direction and the vertical direction by the combination of the convex guide and the concave groove, that is, the guide including the combination of the key, the key groove, and the presence / absence groove. It may have a structure.

The outer diameters of the first and second centering face plates 32 and 33 are formed to have substantially the same dimensions.
3 has a substantially L-shaped cross section as shown in FIG.
1 are attached at least one at a time to the top and bottom. The tongue pieces 281a of these brackets are first and second in a state where there is almost no gap (a gap of about 0.01 mm).
Are movably pressed on the movable platen 2. In order to prevent interference between the holding member 281 and the first and second centering face plates 32 and 33, the holding member is attached at a position having a gap at least equal to the thermal expansion. Of course, the same is true even when the holding metal 281 is attached not to the top and bottom but to the left and right. Thus, the first cam follower 34 can move the first centering face plate 32 horizontally on the second centering face plate 33.
The second aligning face plate 33 is moved by the movable platen 2
It is guided by the second cam follower 35 so as to be movable in the vertical direction above, and these are pressed by holding metal fittings 281. Thus, the movable mold 12 can move without being restricted by the center position of the movable platen 2. In addition, when the mold receives a twist, the twist is applied to the cam follower. Therefore, the guide means 280 of the present embodiment is constituted by the long holes 32a, 33a of the first and second centering face plates 32, 33, the guide represented by the cam followers 34, 35, and the holding metal fitting 281.

These aligning face plates 32 and 33 are shown in FIG.
As shown in FIG. 14, the preload is maintained in an equilibrium state by an equilibrium unit having an aligning spring similar to that of the second embodiment, and is supported. That is, the first centering face plate 32 is
As a result, the second centering face plate 33 is moved to the second balancing means 250a,
250b. In the present embodiment, the first balancing means 240 is moved horizontally, and the second balancing means 250a, 25
0b is the one that is supported in the vertical direction. Each of the brackets 241 and 251 constituting these balancing means 240, 250a and 250b is similar to the second embodiment,
It is formed into a block that merely supports the centering springs 242, 252 (252b). Further, at least the lower vertical balancing means 250b incorporates the same balancing means 260 as in the first embodiment. Bracket 24
Position display means 270 similar to that of the first embodiment is provided on one of the first and the second 251. Since these details are the same as in the first embodiment, the corresponding 200
A reference number is attached to the series, and the detailed description is omitted. In addition, even in this configuration, when adopted in a normal vertical mold clamping device,
As in the other embodiments, the balance adjusting means 60 may not be provided.

The mold 10 is mounted, aligned and supported on such a mold mounting apparatus as in the first embodiment.
Thus, not only the same operation and effect as in the first embodiment can be obtained, but also the following operation and effect can be obtained.
Since the first centering face plate 32 and the second centering face plate 33 are supported and guided by the cam followers 34 and 35, the twist is not directly borne by the guide pin 21.

In the mold mounting apparatus of the first to third embodiments described above, at least the lower vertical balance adjusting means 60, 160, and 260 are replaced by automatic vertical balance control means described below. 300 can be employed. In this case, the vertical position display means 70, 170,
270 is replaced by position detecting means 290. FIG.
5 to 17 show the case where these are adopted in the second embodiment. FIG. 15 is a side view of the position detecting means, FIG. 16 is a front view of the position detecting means, and FIG. 17 is a detailed view of the automatic vertical balance control means. It is.

As shown in FIGS. 15 and 16, the position detecting means 290 has a displacement detecting sensor 292 attached to a bracket 291 corresponding to the bracket 141 or 151, for example. The displacement sensor 292 detects the position of the centering face plate 31 with respect to the movable platen 2,
It is a known optical or ultrasonic non-contact type sensor, or a contact type sensor that detects a measurement element by bringing the probe into contact with the end surface of the movable mold 12 or the centering face plate. In the figure, an optical reflection type is illustrated.

As shown in FIG. 17, the automatic vertical balance control means 300 includes at least the vertical lower balance means 15.
0b, and is provided in a bracket 302 corresponding to the bracket 151. The automatic vertical balance control means 300 includes an aligning spring 301 mounted on the bracket 302, a pressing member 303 capable of pressing the spring, and a ball screw 30 for moving the pressing member 303.
4. Ball screw nut 305 and servo motor 306
And the servo motor 306 attached to the base 311
And the pulley 30 transmitting this rotation to the ball screw 304.
7, 308 and a timing belt 309. The ball screw 304 is supported by a bearing 310 housed in a housing 312, the pressing member 303 is fixed integrally with the ball screw nut 305, and is prevented from rotating by a key or pin (not shown). ing. Thus, the servo motor 3
06 is converted into the movement of the ball screw nut 305, that is, the movement of the pressing member 303, so that the centering spring 301 is moved.
Of the centering face plate 31 is adjusted. The servo motor 306 has a brake. Of course, it is also possible to employ these on one side of the horizontal balancing means 40, 140, 240 so that the spring force of the centering springs 42, 142, 242 can be finely adjusted.

The alignment of the mold is automatically performed by the mold mounting apparatus having the above-described configuration as follows. First, the closed mold is set on the mold clamping device and attached to the centering face plate 31, and the position of the centering face plate is detected and stored as a reference position. At this time, a predetermined preload is applied to the upper and lower centering springs 152 and 301 when the centering face plate 31 is centered. Next, similarly to the first embodiment, the centering face plate 3 when the lock bolt 39 is removed and the mold is opened.
1 is detected. Then, a deviation between the detected position and the reference position is calculated by a controller (not shown). When the deviation exceeds a predetermined range, that is, when the centering face plate 31 is misaligned by a predetermined amount or more, the servomotor 306 is moved. Is rotated to move the pressing member 303, and the centering spring 301 is moved.
Is adjusted to correct the misalignment of the centering face plate 31.
By performing this adjustment during several mold opening and closing operations,
The preload of the lower aligning spring 301 is adjusted to a spring force obtained by adding the total weight of the movable mold 12 and the like and the aligning face plate 31 to the preload of the upper aligning spring 152 to be in an equilibrium state. Of course, the left and right preloads are in an equilibrium state as described above. Thus, the movable mold 12 is aligned with the fixed mold 11. The automatic control of the centering adjustment by the automatic vertical balance control means 300 may be executed not only when the mold is set first but also every predetermined number of shots.
If the deviation exceeds a predetermined value, an alarm can be issued.

In this embodiment as well, the same operation and effects as those of the first to third embodiments can be obtained, and the movable mold 12 is automatically centered with respect to the fixed mold 11.

[0044]

According to the above-described mold mounting apparatus of the present invention,
The aligning face plate on which the movable mold is mounted is preloaded and supported in an equilibrium state from above, below, left and right by the aligning spring of the balancing means at the aligning position, and is not restrained by the center of the movable platen near the aligning position. Since the movable die is closed while being corrected for misalignment by the die positioning device, no excessive force is applied to the die positioning device because it is held movably with a small external force. In addition, when the mold mounting device includes the position display means, the position of the centering face plate with respect to the movable platen can be easily confirmed.

When the centering face plate is preloaded and supported by the balancing means in an equilibrium state and guided by the horizontal vertical guide means, the movable mold is supported so as to be movable by a small external force, and the torsion is prevented. Even if it is received, this twist is borne by the horizontal vertical guide means, so that no excessive force is applied to the mold positioning device. Similarly, when the aligning face plate is composed of the first aligning face plate and the second aligning face plate and these aligning face plates are supported by the guide means, similarly, no excessive force is applied to the mold positioning device. .

In particular, in the case of a mold mounting device for a horizontal mold clamping device, when the mold mounting device incorporates at least the lower vertical balancing means with the balance adjusting means, the preload of the lower centering spring is reduced. Can be easily balanced with the preload of the upper centering spring and the total weight of the movable mold and the like and the centering face plate.

Also, a mold mounting device for a horizontal mold clamping device, in which an automatic vertical balance control means and a position detection means are incorporated in place of the vertical balance means and the position display means, so that the movable mold is fixed. Since the mold is automatically centered, it is possible to continue unmanned and long-time operation without worrying about the above-mentioned trouble.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a mold attaching device and a mold according to a first embodiment are attached to a mold clamping device in a partial cross section.

FIG. 2 is a front view of the mold mounting device and the mold of FIG. 1 as viewed from the left side.

FIG. 3 is a plan view of FIG. 1 as viewed from above.

FIG. 4 is a detailed view of the vertical balance guiding means and the balance adjusting means of the first embodiment.

FIG. 5 is a detailed view of a position display unit according to the first embodiment.

FIG. 6 is a front view of the second embodiment, corresponding to FIG.

FIG. 7 is a side view of a vertical balance unit and a position display unit according to a second embodiment.

FIG. 8 is a detailed view of the horizontal and vertical guide means shown in a partial cross section of the second embodiment.

FIG. 9 is a side view of the horizontal balance unit and the position display unit of the second embodiment.

FIG. 10 is a detailed view of the vertical balance means and the balance adjustment means of the second embodiment.

FIG. 11 is a front view of a third embodiment, corresponding to FIG. 2;

FIG. 12 is a detailed view of a vertical balance unit, a balance adjustment unit, and a position display unit of the third embodiment.

FIG. 13 is a detailed view of the guide means of the third embodiment.

FIG. 14 is a detailed view of a horizontal balance unit and a position display unit of the third embodiment.

FIG. 15 is a side view of the position detecting means when employed in the second embodiment.

[Explanation of symbols]

FIG. 16 is a front view of a position detecting unit when adopted in the second embodiment.

FIG. 17 is a detailed view of an automatic vertical balance control means when adopted in the second embodiment.

[Description of Signs] 2 movable platen 10 mold 11 fixed mold 12 movable mold 20 mold positioning device 31 aligning face plate 32 first aligning face plate 33 second aligning face plate 40 horizontal balance guide means 140 horizontal balance means 240 First balancing means 42, 142, 242 Aligning spring 50 Vertical balancing guiding means 150 Vertical balancing means 250 Second balancing means 52, 152, 252 Aligning spring 52b, 152b, 252b Lower aligning spring 60, 160, 260 Balancing Adjusting means 70, 170, 270 Position display means 180 Horizontal and vertical guide means 280 Guide means 290 Position detection means 300 Automatic vertical balance control means 301 Alignment spring of automatic vertical balance control means

Claims (6)

[Claims] 1. A mold mounting device for an injection molding machine for mounting a movable mold positioned on a fixed mold by a built-in mold positioning device to a movable platen, wherein an aligning face plate for attaching the movable mold is provided. A mold mounting device for an injection molding machine, which is preloaded and supported in equilibrium in a horizontal direction and a vertical direction by an aligning spring. 2. A mold mounting apparatus for an injection molding machine for mounting a movable mold positioned on a fixed mold by a built-in mold positioning device on a movable platen, wherein an aligning face plate on which the movable mold is mounted is mounted. Horizontal equilibrium guide means for movably guiding the movable platen on the mold mounting surface, preloading and supporting the movable platen in the equilibrium state from both sides in the horizontal direction in the horizontal direction, and Vertical equilibrium guide means for movably guiding on the mold mounting surface, and preloading and supporting in a balanced state in the vertical direction from above and below by a centering spring, and display the horizontal and vertical positions of the centering face plate. Two position indicating means,
A mold mounting device for an injection molding machine, comprising: 3. A mold mounting device of an injection molding machine for mounting a movable mold positioned on a fixed mold by a built-in mold positioning device on a movable platen, wherein an aligning face plate on which the movable mold is mounted is mounted. Horizontal and vertical guide means for movably guiding the movable platen in the horizontal and vertical directions on the mold mounting surface, and the aligning face plate is preloaded and supported in an equilibrium state from both sides in the horizontal direction by an aligning spring. Horizontal balancing means, vertical balancing means for preloading and supporting the centering face plate in a balanced state in the vertical direction from above and below by a centering spring, and two positions for displaying the horizontal and vertical positions of the centering face plate. And a position indicating means. 4. A mold mounting device of an injection molding machine for mounting a movable mold positioned on a fixed mold by a built-in mold positioning device on a movable platen so as to be movable in one of a horizontal direction and a vertical direction. A first aligning face plate to be guided and to which the movable mold is attached, and a first aligning face plate interposed between the first aligning face plate and the movable platen;
A second centering face plate guided movably in a direction perpendicular to the moving direction of the centering face plate, and the first centering face plate and the second centering face plate movable on a mold mounting surface of the movable platen. Guiding means for guiding, first balancing means for preloading and supporting the first centering face plate in one of horizontal and vertical directions from both sides by a centering spring in a balanced state, and adjusting the second centering face plate. Second balancing means for preloading and supporting both sides of the first aligning face plate in an equilibrium state in a direction orthogonal to the direction of movement of the first aligning face plate, and indicating the horizontal and vertical positions of the first aligning face plate; A mold mounting device for an injection molding machine, comprising: two position indicating means. 5. The balance adjusting means according to claim 2, wherein at least the vertically lower balancing means is capable of adjusting the spring force of the centering spring. A mold mounting device for an injection molding machine, comprising: 6. The mold mounting device for an injection molding machine according to claim 2, further comprising: a position detecting means for detecting a position of the centering face plate, in place of at least the vertical position indicating means, A mold mounting unit for an injection molding machine, comprising: an automatic vertical balance control unit that automatically adjusts a spring force of an alignment spring based on position data measured by the position detection unit, instead of the balance adjustment unit. apparatus.