JP2905018B2 - Mold mounting method in vertical rotary molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting a die in a vertical rotary molding machine, and more particularly to a method for forming a vertical rotary molding machine on which two upper dies and two lower dies are mounted, even when using large upper and lower dies. The present invention relates to a method for mounting a mold in a vertical rotary molding machine that can easily perform mounting and removing of a mold without requiring an increase in the size of the machine itself.

[0002]

2. Description of the Related Art Conventionally, as one type of molding machine used for multicolor molding of resin products, a fixed plate and a movable plate arranged above the fixed plate and driven to approach / separate in a vertical direction. At the same time, a rotary platen is provided on a surface of the movable plate facing the fixed platen, and two upper dies mounted on the rotary platen and two lower dies mounted on the fixed platen are simultaneously pressed together. The vertical rotary molding machine of the type
Are known.

In such a rotary molding machine, generally, an injection cylinder for filling a resin material into a molding cavity formed by each upper and lower mold is provided.
Since the lower die is disposed on both sides of the lower die in the arrangement direction of the fixed plate, the mounting and removing operations of the die are performed, for example, as disclosed in Japanese Patent Publication No. 3-8407.
The dies are inserted into or taken out of the fixed platen in a state parallel to the traveling direction by a carriage that is moved in a direction in which the injection cylinders are not arranged, that is, in a direction perpendicular to the arrangement direction of the dies. It is done by doing.

However, in recent years, with the diversification and complexity of product shapes or the increase in the size of a core cylinder mounted on a mold, a mold having a large outer dimension has been used as a mold for a rotary molding machine. Therefore, according to the method disclosed in the above publication, when trying to insert the mold on the fixed plate in a state of being parallel to the traveling direction, the die is movable upright at the four corners of the fixed plate. The width of the dies arranged in parallel is larger than the width of the front end of the tie rods (table stays) that guide the board in the vertical direction, so that the dies cannot be inserted and removed from the fixed plate. There were cases.

[0005]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to increase the size of a molding machine used even when a large upper and lower mold is used. It is an object of the present invention to provide a method for mounting a mold in a vertical rotary molding machine that can easily perform mounting and dismounting of a mold without requiring the above.

[0006]

In order to solve the above-mentioned problem, a feature of the present invention is to fix the movable platen which is disposed above the fixed plate so as to be opposed to the fixed platen and driven to approach / separate from the fixed platen. A rotating surface plate is provided on the surface facing the plate, and the two upper dies mounted on the rotating surface plate and the two lower dies mounted on the fixed platen are simultaneously pressed together,
A vertical mold in which two injection cylinders are arranged on both sides in the arrangement direction of the lower mold in the fixed platen, and molding cavities formed by the clamped upper and lower molds are each filled with a predetermined resin material. In rotary molding machines,
When mounting each of the two upper dies and the lower dies on the rotary platen and the fixed platen, (a) the rotary platen is positioned to be separated upward from the fixed platen, and 90 in the circumferential direction from the regular corresponding position
And (b) superimposing the two upper dies and the lower dies on the fixed platen in a direction perpendicular to the direction in which the two injection cylinders are arranged. (C) moving the movable plate closer to the fixed plate side while inserting the upper die and the lower die overlapped with each other, A step of bringing the rotary platen into contact with the two upper molds inserted and arranged thereon, and fixing the two upper molds at regular positions with respect to the rotary platen; and (d) the movable platen. Moving away from the fixed platen, the two upper dies fixed to the rotary platen and the two lower dies fastened to each of the upper dies, lifting up and separating from the fixed platen, (E) rotating the rotating platen in the circumferential direction with respect to the fixed platen; And pairwise swirled 90 °, a step allowed to position to the normal position corresponding to said stationary platen,
(F) moving the movable plate closer to the fixed plate,
Contacting the two lower dies supported by the rotary platen with the fixed platen, and fixing the two lower dies in proper positions with respect to the fixed platen; And a step of releasing the fastening between the lower mold and the lower mold.

[0007]

In the method of the present invention, first, two superimposed upper and lower dies are arranged in series in the advancing direction, and the upper and lower dies are circumferentially moved 90 degrees from a regular fixed position with respect to the fixed platen. ° In a state shifted, it will be inserted and positioned on the fixed board, after such insertion, both upper molds will be fixed to the rotating platen provided on the movable board, and both upper and lower molds will be lifted integrally, After being rotated by 90 ° in the circumferential direction so as to be at a regular position with respect to the fixed board, each lower mold is fixed to the fixed board.

Therefore, in such a method, the upper and lower dies are arranged in series in the traveling direction from the front ends of the tie rods erected at the four corners of the fixed board and inserted on the fixed board. Therefore, if the front and rear dies have the same width as the outer dimensions of the upper and lower dies, the two upper and lower dies can be simultaneously inserted on the fixed platen.

Therefore, even when a large mold is used,
The mounting and dismounting of the mold can be easily performed without requiring an increase in the size of the vertical rotary molding machine in order to secure the width of the tie rod.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 and 2 schematically show a specific example of a vertical rotary molding machine suitably used in carrying out the method of the present invention. In these figures, 1
Reference numeral 0 denotes a movable plate, which is disposed between a lower plate 12 as a fixed plate and an upper plate (not shown), and is guided by four tie rods 14 interconnecting the four corners of the upper and lower plates. By being moved up and down by a mold opening / closing cylinder (not shown) provided on the upper platen side, the lower platen 12 can be moved toward and away from the lower platen 12.

On the lower surface of the movable platen 10, a disk-shaped rotary platen 16 is attached so as to be rotatable around the center line so as to face the lower platen 12 below.
The rotary platen 16 is rotationally controlled by a servo motor 18 provided on the movable platen 10 by an arbitrary angle around the center line.

Further, two mold mounting positions are set on the lower surface of the rotary platen 16 and the upper surface of the lower plate 12 opposed thereto, respectively. , Four mold clampers 20 are provided. Then, upper molds 22 to be described later are attached to the two mold attachment positions set on the lower surface of the rotary platen 16 by the mold clamper 20, while the lower platen 1 is attached.
Lower molds 24 to be described later are respectively attached to two mold attachment positions set on the upper surface of the second mold 2.

As shown in FIG. 3, the mold clamper 20 has a structure in which a cylinder is formed by a housing 26, and a locking rod 28 as a piston is disposed inside the cylinder. It has been. The locking rod 28 is normally protruded from the housing 26 by a coil spring 30 as shown by an imaginary line, while supplying oil into the cylinder chamber through a port 32, thereby As described above, the locking rod 28 is stored in the retracted position. That is, the mounting plates of the upper and lower dies 22, 24 can be pressed and locked to the rotary platen 16 and the lower plate 12 by the locking rods 28 of the die clamper 20.

The two upper dies 22, 22 and the lower dies 24, 2 fixed to the rotary platen 16 and the lower plate 12, respectively.
4, the movable platen 10 is driven toward the lower platen 12 by a pressing cylinder (not shown) arranged on the upper platen side while the rotary platen 16 is positioned at a corresponding rotation position with respect to the lower platen 12. As a result, the mold is clamped.

Further, although not explicitly shown in the drawings,
Two injection cylinders are arranged on both sides of the lower plate 12 in the arrangement direction of the molds (both vertical sides of the lower plate 12 in FIG. 1), and the injection cylinders are clamped by these injection cylinders. A predetermined resin material is injected and filled into a cavity formed in the upper and lower molds.

On the other hand, on the upper surface of the lower platen 12, as shown in FIG. 1, two groove rails 34, 34 are arranged in the arrangement direction of the mold mounting positions (that is, in the facing direction of the injection cylinder, not shown). ) Extends parallel to the direction perpendicular to
Is formed. And these groove rails 34, 34
Along one side of the lower platen 12 (the one side on which the injection cylinder is not disposed) where the mold is opened.
Are provided.

The mold transfer device 36 includes a base 37 having a rectangular frame structure, and guide rails 38, 38 extending over substantially the entire length in the longitudinal direction are provided on the upper surface of the base 37. The groove rail 34 provided on the board 12 is provided in a direction perpendicular to the groove rail 34. And those guide rails 38, 38
A substantially rectangular flat carriage 40 is provided so as to be movable upward. The movable carriage 40 is moved on the guide rails 38 by a hydraulic cylinder (not shown).
7 is reciprocated in the longitudinal direction, that is, at right angles to the groove rail 34 provided on the lower platen 12.

Further, on the upper surface of the movable carriage 40,
Two groove rails 42 extending in a direction perpendicular to the moving direction on both sides in the moving direction.
Are provided. Then, when the movable carriage 40 is positioned at the one movable end shown in FIG. 1 or at the opposite movable end, each one of the groove rails 42, 42 is provided.
Are connected to the groove rails 34 formed on the lower platen 12.

Further, on the movable carriage 40, two sets of dies 4 are mounted on the two sets of the two groove rails 42, 42, and are respectively composed of upper and lower dies 22, 24.
Two mold-equipped vehicles 4 that simultaneously carry and transport 4,44
6, 46 are placed. That is, these mold mounted vehicles 46, 46 are reciprocated integrally with each other in accordance with the reciprocating motion of the movable vehicle 40, and when the movable vehicle 40 is positioned at one of the movable ends, one of the movable vehicles 40, 46 is moved. Are connected to the groove rails 34, 34 provided on the lower platen 12, so that the grooved rails 42, 4 provided on the lower platen 12 can be used.
2 and 34, 34 so as to be reciprocated between the movable carriage 40 and the lower board 12.

As shown in FIGS. 4 and 5, the mold mounting vehicle 46 has a substantially ladder-like frame shape as a whole, and further has a downwardly extending portion on both sides in the width direction. Protruding legs 48, 48 are provided integrally. As shown in FIG. 6 and FIG. 7, the two legs 48 have a hollow portion 50 opening downward.
Are formed, and four wheel bogies 52 are accommodated and arranged in the respective hollow portions 50, and each of the four wheel bogies 52 is provided with a plurality of coil springs 54 interposed between the die bogies 46. In the state of being urged in the separating direction, the mold loading vehicle 46
It is mounted so as to be relatively displaceable in the vertical direction by guide rods 56, 56 projecting downward from the upper side. In the figure, reference numeral 57 denotes a mold positioning pin protruding from the upper surface of the mold mounting vehicle 46, and 58 denotes a coil spring interposed between the mold mounting vehicle 46 and the wheel carriage 52. Reference numeral 54 denotes a positioning pin.

That is, the die mounting vehicle 46 is supported by a total of eight wheel vehicles 52, and each wheel vehicle 52
The wheels 60, 60 mounted on the groove rails 42, 4
2 and 34, 34. Further, when a load larger than the upper part is applied, the die mounted vehicle 46 is displaced downward against the urging force of the coil spring 54, so that the lower surfaces of the two leg portions 48, 48 directly contact the lower plate. 12 and is supported, so that input of an excessive load to the wheel bogie 52 is prevented.

Further, the above-described mold mounting vehicle 46 is reciprocally driven by a driving means such as a hydraulic cylinder (not shown). In this embodiment, the output of the driving means is the intermediate carriage 62. The movement stroke of the mold mounting vehicle 46 can be advantageously ensured by the transmission to the mold mounting vehicle 46. That is, as shown in FIG. 8, the intermediate bogie 62 is disposed in a state of being housed inside the die mounting vehicle 46, and is mounted on the movable bogie 40 by the wheels 64. It is possible to reciprocate in the direction of movement 46. Further, sprockets 66, 68 are provided at both ends in the movement direction of the intermediate bogie 62, and both end portions 70, 7 are provided with respect to both sprockets 66, 68, respectively.
0 is a movable carriage 40 located between the sprockets 66 and 68.
A transmission chain 72 fixed thereon is wound around the transmission chain 72, and an intermediate portion of the transmission chain 72 is fixed to a connecting plate 74 provided on the mold loading wheel 46.

When the intermediate carriage 62 is moved by a driving means (not shown), the intermediate carriage 6
The mold-mounted vehicle 46 can be driven with a stroke obtained by adding the amount of rotation of the transmission chain 72 accompanying the movement of the intermediate carriage 62 to the amount of movement of itself 2.

Next, in a vertical rotary molding machine equipped with the mold transfer device 36 having the above-described structure, the mold 44 is used.
The method of mounting the will be described in detail.

First, as indicated by phantom lines in FIGS. 1 and 2, two sets of upper and lower dies 44 are placed on the dies loading vehicle 46 of the dies transport device 36. However, there, these molds 44 are connected to the mold-equipped vehicle 4.
6 are arranged in series in the moving direction of the rotary molding machine, that is, the direction in which the mold is inserted into the lower plate 12 of the rotary molding machine, and are placed.
The two dies 44 are positioned with high precision by positioning pins 57 provided on the die loading wheel 46.

Then, as shown in FIG. 9, the mold loading vehicle 46 is moved and guided on the lower plate 12, so that the dies 44, 44 mounted thereon are movable with the lower plate 12. Guide between the panel 10. In addition, lower board 1
In the molds 44, 44 inserted and arranged on the upper surface 2, the molds 44 are located 9
Since it is shifted by 0 ° (see FIG. 12), it is impossible to clamp both dies 44, 44 to the lower plate 12 as it is.

Further, as described above, prior to or after the insertion of the dies 44, 44 onto the lower plate 12, each of the dies 44 is inserted.
Upper and lower dies 22, 24 are fastened to each other. In the fastening device for the upper and lower dies 22, 24, for example, as shown in FIG. 10, an air cylinder 76 is mounted on the upper die 22, and a locking rod 78 driven by the air cylinder 76 is provided.
Is inserted and locked in a locking hole 80 provided in the lower mold 24 side.

Further, the lower plate 1 of the dies 44, 44
Prior to or after insertion into the upper part, the rotary platen 16 of the rotary molding machine is rotated by the servomotor 18 so that the rotary platen 16 is moved 90 degrees in the circumferential direction from the corresponding position with respect to the lower platen 12. Deviate by only °.

As described above, by rotating the rotating platen 16 by 90 ° in the circumferential direction from the corresponding position with respect to the lower platen 12, the metal provided on the rotating platen 16 as shown in FIG. The mold clampers 20 are respectively inserted on the lower plate 12 and are relatively positioned with respect to the molds 44, 44 which are positioned at 90 ° in the circumferential direction from a regular mounting position on the lower plate 12. They are opposed to each other with the positional relationship of the regular mounting position.

Thereafter, the mold closing operation is performed by the mold opening / closing cylinder, the movable platen 10 is moved to the lower platen 12 side, and the rotary platen 16 is brought into contact with the upper dies 22, 22 of both dies 44,44. Let it. That is, by such an operation, the upper dies 22, 22 are brought into contact with the regular die mounting positions on the rotary platen 16, respectively.

Further, the movable platen 10 is driven to the lower platen 12 side by a pressing cylinder (not shown), and the rotary platen 16 is pressed against the upper dies 22 and 22. The upper molds 22 are fixed to the lower surface of the rotary platen 16 by 20. The pressing operation of the rotary platen 16 against the upper dies 22, 22 is for ensuring the upper die locking operation by the mold clamper 20, and the pressing operation of about 1/2 of the normal pressing force is performed. Applying force is sufficient. In addition, when the pressing force acts, the die-mounted vehicle 46
However, as described above, the abutment directly comes into contact with the lower platen 12, thereby preventing damage to the wheel bogie 52 and the like in the mold mounting vehicle 46.

Next, as shown in FIG. 11, the mold opening operation is performed by the mold opening / closing cylinder, the movable platen 10 is moved to the upper platen side, and the rotary platen 1 on which the upper dies 22, 22 are fixed.
6 is lifted away from the lower plate 12. That is, by such an operation, the dies 44, 44 composed of the upper and lower dies 22, 24 fastened to each other are integrally hung on the rotary platen 16 and separated from the lower plate 12.

After suspending both molds 44, 44,
The mold loading vehicle 46 is moved backward to the movable carriage 40 side and removed from the lower platen 12, while the rotary platen 16 is moved in the circumferential direction by the servomotor 18 as shown in FIG.
By rotating by 0 °, the rotating platen 16 is guided to the proper corresponding position with respect to the lower platen 12 and positioned. That is, by such an operation, the dies 44 and 4 suspended on the rotary platen 16 are formed.
The four lower dies 24, 24 are respectively opposed to regular die mounting positions on the lower plate 12.

Thereafter, the mold closing operation is performed again by the mold opening / closing cylinder, and the movable platen 10 is moved to the lower platen 12 side.
The lower dies 24 of the two molds 44 suspended from the rotary platen 16 are brought into contact with the lower plate 12. That is, by such an operation, the two lower molds 24, 24 are brought into contact with the regular mold mounting positions on the lower board 12, respectively.

Further, the movable platen 1 is
0 is driven toward the lower platen 12 to perform a mold clamping operation.
4 is fixed to the upper surface of the lower panel 12. The mold clamping operation is for ensuring the lower mold locking operation by the mold clamper 20, and is generally performed by applying a regular mold clamping force.

Then, by releasing the fastening between the upper and lower dies 22, 24, the two upper and lower dies 22, 24 are mounted on the rotary molding machine as shown in FIG. Work is complete.

The upper and lower molds 2 from the rotary molding machine are used.
The removal operation of the molds 2 and 24 can be performed by repeating the same operation through the steps opposite to the mold mounting operation, and furthermore, the mold removing operation and the mounting operation are continuously performed. By repeating the process, the mold replacement operation is performed.

Accordingly, in such a mold mounting method, when the two dies 44, 44 are inserted into the lower plate 12, the two dies 44, 44 are connected in series in the insertion direction. When the width of the tie rods 14, 14 as insertion holes is only the width of a single mold 44, both dies 44, 44 are simultaneously inserted on the lower platen 12. , Lower plate 12 and rotary platen 1 of rotary molding machine
6 can be attached.

In addition, in this method of mounting the mold, the conventionally used vertical rotary molding machine can be used as it is, so that it can be carried out extremely easily and at low cost. It is.

Therefore, according to such a method, even if a large die having a dimension larger than the opening interval of the tie rods 14 as insertion holes in the parallel state is mounted, the tie rods 14, 14 are not required. It is possible to easily cope with this without increasing the size of the rotary molding machine itself to increase the frontage interval.

Although the embodiment of the present invention has been described in detail, this is a literal example, and the present invention is not construed as being limited to such a specific example.

For example, in the above-described embodiment, a servo motor is employed as a driving means for rotating the rotary platen 16, but a conventional indexing machine or the like may be used instead.

Further, in the present invention, a driving mechanism and a guide means for the die transfer device 36 employed for inserting the die onto the lower plate 12 of the rotary molding machine, or a moving mechanism of the die mounting vehicle 46. The specific structure such as is not limited to that of the above embodiment.

Further, the specific structure of the vertical rotary molding machine for carrying out the present invention and the upper and lower mold fastening devices are not limited to those of the above-described embodiment.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements and the like can be implemented in an embodiment,
It goes without saying that all such embodiments are included within the scope of the present invention, without departing from the spirit of the present invention.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view showing a specific example of a vertical rotary molding machine and a mold transfer device used for carrying out a mold mounting method according to the present invention.

FIG. 2 is a front view of the vertical rotary molding machine and the mold transfer device shown in FIG.

FIG. 3 is a longitudinal sectional view showing a mold clamper used in the vertical rotary molding machine shown in FIG.

FIG. 4 is a plan view showing a mold mounting vehicle used in the mold transfer device shown in FIG. 1;

FIG. 5 is a right side view in FIG.

6 is an enlarged view of a section taken along line VI-VI in FIG. 4;

FIG. 7 is an enlarged view of a VII-VII section in FIG. 4;

FIG. 8 is an enlarged cross-sectional view of a main part for describing a driving mechanism of a die-mounted vehicle in the die transfer device shown in FIG. 1;

FIG. 9 is a process chart for explaining a mold mounting operation according to the present invention using the vertical rotary molding machine and the mold conveying device shown in FIG. 1;

FIG. 10 is an explanatory sectional view showing a specific example of a fastening device for an upper die and a lower die.

FIG. 11 is another process diagram for explaining the mold mounting operation according to the present invention.

FIG. 12 is still another process diagram for explaining a mold mounting operation according to the present invention.

FIG. 13 is still another process diagram for explaining a mold mounting operation according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Movable board 12 Lower board 14 Tie rod 16 Rotation surface plate 18 Servo motor 20 Die clamper 22 Upper die 24 Lower die 36 Die transfer device 40 Moving carriage 44 Die 46 Die mounting vehicle 78 Lock rod 80 Lock hole

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-143823 (JP, A) JP-A-2-22019 (JP, A) JP-A-57-77542 (JP, A) 65761 (JP, U) Jiko 38407 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B29C 45/04-45/06 B29C 45/26 B29C 33/30- 33/36

Claims (1)

(57) [Claims] 1. A rotary platen is provided on a surface of a movable plate that is opposed to a fixed platen and is driven to approach / separate from the fixed platen, and is attached to the rotary platen. While the two upper dies and the two lower dies mounted on the fixed platen are simultaneously pressed together, two injection cylinders are arranged on both sides of the fixed platen in the arrangement direction of the lower die, In a vertical rotary molding machine in which the molding cavities formed by the clamped upper and lower dies are each filled with a predetermined resin material, the two upper dies and the lower dies are each rotated by the rotary platen and A step of positioning the rotating platen upwardly away from the fixed platen when mounting it on the fixed platen, and rotating the rotary platen by 90 ° in a circumferential direction relative to a regular corresponding position with respect to the fixed platen; And before Each of the two upper dies and the lower dies are overlapped with each other, and the two injection cylinders are inserted in a direction perpendicular to the direction in which the two injection cylinders are arranged, and are arranged in series on the fixed platen with respect to the traveling direction. Fastening the upper mold and the lower mold that have been superimposed on each other, and moving the movable plate closer to the fixed plate, and moving the movable plate to the two upper dies inserted and arranged on the fixed plate. Abutting the plates, fixing the two upper dies at a regular position with respect to the rotary platen, and moving the movable plate away from the fixed platen and fixing the movable platen to the rotary platen. Lifting the two upper dies and the two lower dies fastened to the respective upper dies from the fixed plate, and separating the rotary platen from the fixed plate in a circumferential direction by 90 degrees; Rotate to the correct position corresponding to the fixed platen Placing the movable platen closer to the fixed platen side so that two lower dies supported by the rotary platen abut on the fixed platen, and the two lower dies are fixed to the fixed platen. And fixing the upper die and the lower die to each other, and releasing the fastening of the upper die and the lower die relative to each other.