JPH081058Y2 - Mold changing device for rotary injection molding machine - Google Patents

Description

[Detailed description of the device]

[0001]

The present invention relates to a metal mold for a rotary injection molding machine in which a plurality of molds are placed on a rotary table and the molds are sequentially injection-molded as the rotary table rotates. The present invention relates to a mold exchanging device.

[0002]

2. Description of the Related Art As such a rotary injection molding machine, a machine described in, for example, Japanese Patent Application Laid-Open No. 2-165922 is known. This is because the mold is detachably mounted by a clamp on each of a plurality of seating surfaces provided on the rotary table that is intermittently indexed and rotated at a predetermined angle, and the mold is associated with the rotation of the rotary table. The mold clamping / injecting, station mold changing station, cooling station, and mold opening station are arranged in sequence according to the rotation position of the machine, and efficient injection molding work can be performed by effectively utilizing the narrow space. The purpose is to do.

Among these mold rotating positions, at a position corresponding to the mold changing station, a mold changing table and a pull pusher which are flush with the rotary table and a plurality of molds are stored in advance. A mold exchanging device including a storage box is provided. When exchanging the mold located at the mold exchange station with this mold exchanging device, first release the clamp fixing and transfer the mold from the seating surface of the rotary table to the mold exchanging table. Then, the mold is stored in the storage box by another pull pusher.

Next, the storage box is moved to transfer a new mold for injection molding onto a mold exchanging table,
This is sent to the seating surface of the rotary table and fixed with a clamp. As described above, in the mold exchanging device having the above-described configuration, when the mold needs to be exchanged when changing the type of the molded product, the mold is exchanged while the rotation of the rotary table is stopped. It is attempting to change the setup of the mold substantially within the molding cycle.

[0005]

By the way, in order to replace the mold within a short period of time when the rotation of the rotary table is stopped, the seating surface of the rotary table is replaced with the mold exchanging table. The transfer of molds and the transfer of new molds from the mold change table to the seating surface of the rotary table must be extremely smooth. Therefore, it is desirable that the mold is set so that it can move as easily as possible from the seating surface.

On the other hand, however, when the mold is set so as to be easily moved from the seating surface, the rotary table is rotated, the mold is clamped at the mold clamping / injection station, or the mold opening station is used, despite the fixation by the clamp. There is a problem that the position of the die is displaced due to the opening of the die. In particular, in the mold clamping / injection station, an extremely large mold clamping force acts on the mold, so that even if the rotary table slightly tilts, the component force of this mold clamping force largely acts in the horizontal direction. . Since this may increase the displacement of the mold and hinder smooth molding work, from the viewpoint of seating stability of the mold, each mold being molded should be placed on the seating surface as much as possible. It is desirable to install it so that it does not move easily.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve such conflicting problems at the same time, and a mold change table is provided at a position corresponding to the mold change position. On the die exchange table, a pedestal for holding the die is formed on the pedestal surface of the die exchange table that is continuous with the seating surface of the die on the rotary table, and the die is provided between the pedestal and the seating surface. While a transfer means for transferring the sheet is attached, a plurality of rollers capable of projecting and retracting from the seating surface are arranged on the seating surface so as to extend from the seating surface toward the pedestal side of the mold exchanging table. It is what

[0008]

According to the mold exchanging device having such a structure, at the time of exchanging the mold, the rollers can be projected from the seating surface at the mold exchanging position, so that the die can be transferred very smoothly. Becomes On the other hand, when the die is not replaced, the roller is retracted below the seating surface of the rotary table, so that the die can be brought into close contact with the seating surface and stably placed. As a result, it is possible to prevent the mold from being displaced due to the rotation of the rotary table and the mold clamping force that acts at the mold clamping / injection station, and to continuously perform smooth and accurate molding work, while maintaining the mold replacement. In this case, it is possible to transfer the mold from the seating surface to the mold change table easily and in a short time, and even if the rotary table has a short rotation stop time, the mold can be easily accommodated within the molding cycle. It becomes possible to perform setup change.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show the entire structure of a rotary injection molding machine according to the present embodiment. This rotary injection molding machine is composed of an injection device 1, a molding device 2 and a mold exchanging device 3. Has been done. However,
The mold exchanging device 3 is omitted in FIGS. 1 and 2. The injection device 1 is a well-known device that injects plasticized resin raw material into the heating cylinder 11 from a nozzle 12 at the tip of the heating cylinder 11 with a screw or a plunger.
It is installed on the mold 3 and can move back and forth with respect to the molding device 2.

The molding device 2 is disposed above a rotary table 22 which is inserted through a central shaft 21 provided upright on a base G and is supported horizontally, and a position of the rotary table 22 facing the injection device 1. The mold clamping device 23 is generally composed of a mold clamping device 23 and a mold opening device 24 which is arranged on the opposite side of the center shaft 21. Then, of the board surface on the rotary table 22, a portion located directly below the mold clamping device 23, that is, a portion facing the injection device 1 is defined as a mold clamping / injection station S1. The cooling station S2, the mold opening station S3, and the mold changing station S4 are provided every 90 degrees along the direction (counterclockwise direction in FIG. 2).

The rotary table 22 includes the central shaft 2
1 is externally fitted via a bearing or the like, and the lower surface thereof is supported by contacting with a roller on a support column 25 which is erected on a base G around the central axis 21, and is supported around the central axis 21. It is supposed to be rotatable in the horizontal plane. On the lower surface of the rotary table 22, there is provided a movable disk 26 that rotates coaxially and integrally with the rotary table 22 and has a gear formed on the outer periphery thereof. A drive device 28 having a meshing drive gear 27 is provided. This drive 2
8 is a rotary table 2 by a proximity switch or the like.
A control device (not shown) having an indexing mechanism for indexing the rotational position of No. 2 is connected, and the rotary table 22 is intermittently operated by receiving a signal from the control device and moving or stopping the drive device. It is driven to rotate at a constant angle (90 ° in this embodiment), and is positioned and stopped at a predetermined rotation position.

In this embodiment, the mold K placed on the rotary table 22 is divided into an upper mold K1 and a lower mold K2.
Each of the stations S1 to S4 is divided.
The lower mold K2 is positioned corresponding to the position of the lower mold K2 by being guided by the guide pins 31 protruding from the upper surface of the rotary table 22. The flange F of the lower mold K2 is clamped and fixed by the clampers 32, which are arranged toward the lower mold K2. In this embodiment, a portion of the board surface on the rotary table 22 surrounded by the guide pins 31 ... And the clampers 32 ... Is the seating surface 33 on which the mold K is placed. Reference numeral 34 in the drawing denotes a coupler for supplying cooling water to each mold or draining the supplied cooling water from each mold. Further, a hook 35 is provided on a portion located on the outer peripheral side of the lower die rotary table 22.
Is provided.

On the other hand, the mold clamping device 23 provided in the mold clamping / injection station S1 has two support shafts 41, 41 so as to form a substantially equilateral triangle in plan view together with the central shaft 21.
Is arranged, and a press device 43 is attached to the center of a substrate 42 provided so as to bridge the central shaft 21 and the support shafts 41, 41. This press device 43 is a well-known device that raises and lowers a ram 44 by hydraulic pressure. A movable plate 45 is attached to the lower end of the ram 44 so as to face the rotary table 22, and the ram 44 is lowered. The mold is clamped by pressing the mold between the movable plate 45 and the rotary table 22.

Further, in the mold opening device 24 provided in the mold opening station S3, a lifting hydraulic cylinder 53 is provided on a top plate 52 supported by four columns 51, and the lifting hydraulic cylinder 53 is provided. A support plate 54 is attached to the lower end of the support plate 54 so as to face the rotary table 22, and further a clamp 55 that clamps the upper die K1 of the die K is attached to the lower surface of the support plate 54. Here, reference numeral 56 is provided vertically on the upper surface of the support plate 54, and
Is a rod-shaped guide member that is inserted into the insertion hole of and guides the support plate 54. In this mold opening device 24, a rod-shaped piece at the tip of the hydraulic cylinder 57b for insertion horizontally provided on the top plate is inserted into a long hole of a rod-shaped member 57a provided upright on the upper surface of the support plate, and the top plate is inserted. And a fall prevention device 57 for preventing the upper mold from falling is additionally provided.

At the mold changing station S4 of the rotary table 22, a mold changing device 3 as shown in FIGS. 3 and 4 is provided. However, in FIG. 4, the other stations S1 to S3, the injection device 1, the mold clamping device 23, the mold opening device 24, etc. are omitted. The mold exchanging device 3 includes a mold exchanging table 61 disposed to face the mold exchanging station S4 and a lift roller 62 embedded in the seating surface 33 of the rotary table 22.
And a hydraulic drive system 63 for retracting the lift roller 62
It is composed of and.

The mold changing table 61 is installed on a pair of parallel rails 64 arranged on the floor along the tangential direction of the rotary table 22 in a plan view, and is reciprocally movable in the tangential direction. ing. As shown in FIG. 3, the upper surface of the mold exchanging table 61 is substantially flush with the upper surface of the rotary table 22, and is a pedestal surface 65 continuous with the seating surface 33 positioned at the mold exchanging station S4. ing.
On this pedestal surface 65, there are provided two guide rollers 66 for guiding the lower mold K2 of the mold K to be replaced and two rollers 67, 67 for sliding the lower mold K2 in two rows, respectively.
The mold K, which has been transferred from the seating surface 33 located at the mold exchanging station S4, is once held or is newly provided.
A pedestal 68 for holding the mold K placed on the No. 3 is formed. Further, a pull pusher 69 is disposed between the guide rollers 66 ... And the roller 67 so as to be capable of reciprocating toward the seating surface 33 side, and in the present embodiment, the pedestal surface 65 and the seating surface 65. It constitutes a transfer means for transferring the molds to and from 33. In this embodiment, two pedestals 68 are formed on the pedestal surface 65 of the mold exchanging table 61, and therefore, two sets of pull pushers 69 as transfer means are arranged in parallel on the pedestal surface 65. Has been done.

On the other hand, as shown in FIGS. 5 to 7, the lift roller 62 on the rotary table 22 side has two rows of grooves 33a formed in the seating surface 33 along a direction parallel to the radial direction of the rotary table 22. A pair of roller supporting members 71 movably arranged in the inside and a plurality of roller supporting members 71 are rotatably supported by a supporting shaft 71a orthogonal to the longitudinal direction of the roller supporting members 71 and arranged along the longitudinal direction. Each of the roller supporting members 71 is connected to a plurality of hydraulic cylinders 72 fixed to the groove 33a of the seating surface 33. The roller support member 7 is connected to the drive system 63 by a pipe P and supplies hydraulic oil to the hydraulic cylinder 72 from the hydraulic drive system 63 to pressurize the hydraulic cylinder 72.
1 rises, the rollers 70 ... Project from the seating surface 33, and when the supply of hydraulic oil to the hydraulic cylinder 72 is stopped, the spring mounted inside the hydraulic cylinder 72 causes
The roller support member 71 descends so that the roller 70 is retracted from the seating surface 33. On the outer peripheral side of the rotary table 22, the seating surface 33 is provided with a stepped portion 73 which is formed lower than the protruding height of the roller 70 and higher than the seating surface 33.
As for the die K placed on No. 3, the outer edge of the flange F of the lower die K2 is engaged with the stepped portion 73, so that the radial movement of the rotary table 22 is restricted. There is. Further, 71b is each groove 33 of the seating surface 33.
A stopper fixed to the outer end portion of a holds the movement of the roller support member 71 in the longitudinal direction.

Here, the hydraulic drive system 63 includes a piping system provided for each seating surface 33 in the rotary table 22 and at least one set of piping system provided outside the molding machine, as shown in FIG. Are connected by a coupler 74. The coupler 74 includes a coupler 74 A arranged near each seating surface 33 so as to face the peripheral edge of the rotary table 22, and a column 75 outside the rotary table 22.
Seating surface 3 which is arranged above and is located at the mold changing station S4 when the rotation of the rotary table 22 is stopped.
The coupler 7 provided so as to face the coupler 74A of No. 3
4B and. And when changing the mold,
The coupler 74B on the column 75 is projected toward the rotary table 22 by hydraulic operation or the like,
The socket 76 of B is fitted in the plug 77 of the coupler 75A on the rotary table 22 side so that both of the above piping systems are connected. In this embodiment, three sets of sockets 76 ... And plugs 77 ... Are fitted in the coupler 74 to connect a total of three piping systems. One of these piping systems is connected. The system is used for the hydraulic cylinder 72 of the lift roller 62, and the other two systems are used for wearing and releasing the clamper 32.

In the rotary type injection molding machine having such a structure, at the time of molding, the mold K is first placed on each seating surface 33 of the rotary table 22 and fixed by the clamper 32, and then the rotary table 22 is driven. While rotating intermittently by 28, in the mold clamping / injection station S1, the mold K is clamped by the mold clamping device 23 and the molten resin is injected into the mold by the injection device 1, and this melting is performed in the cooling station S2. A resin is cooled and solidified to form a molded product. Further, at the mold opening station S3, after the upper mold K1 is clamped by the clamper 55 of the support plate 54 of the mold opening device 24, the support plate 54 is lifted together with the upper mold K1 to open the mold, and the molded product is taken out. The support plate 54 and the upper mold K1 are lowered to close the mold. As described above, according to the rotary injection molding machine configured as described above, the rotary table 2
While rotating 2 intermittently, the rotary table 2
By performing a predetermined work in each station S1 to S4 during the rotation stop time of 2, it is possible to continuously perform a series of molding work.

In such a rotary type injection molding machine, the mold K (hereinafter,
It is referred to as an exchanged die 81. ) Is replaced with a mold K (hereinafter referred to as a replacement mold 82) to be used for a new molding operation, first, as shown in FIG.
The exchange mold 82 is placed on one of the pedestals 68, 68, and the mold exchange table 61 is positioned so that the other pedestal 68 faces the mold exchange station S4. Then, when the exchanged mold 81 from which the molded product has been taken out at the mold opening station S3 is positioned at the mold replacement station S4, the coupler 74B on the support column 75 is projected toward the rotary table 22 and the coupler 74 is fixed. The hydraulic drive system 63 of the mold exchanging device 3 is connected.

Next, hydraulic oil is supplied to the piping system for releasing the tight fitting of the clamper 32 to release the tight fitting of the lower die of the die 81 to be replaced, and the hydraulic oil is fed to the piping system for the lift roller 62 hydraulic cylinder 72. To raise the roller support members 71, 71. As a result, the rollers 70 mounted on the roller support member 71 project from the seating surface 33 to float the exchangeable mold 81, and the exchangeable mold 81 is in the direction in which the rollers 70 are arranged, that is, the rotary table 22. Can be moved in the radial direction. Therefore, the pull pusher 69 attached to the other pedestal 68 is moved to the rotary table 22 side, and the hook 3 of the lower die K2 of the exchangeable die 81.
The die 81 to be exchanged is transferred from the seating surface 33 of the rotary table 22 to the other pedestal 68 of the die exchange table 61 by hooking it on the carriage 5 and pulling it away from the rotary table 22.

In this way, the exchanged die 81 has the other base 68.
After the transfer, the mold changing table 61 is moved along the rail 64 so that the one pedestal 68 faces the mold changing station S4. Then, the exchange mold 82 placed on the one pedestal 68 is pushed toward the seating surface 33 side by the pull pusher 69 attached to the one pedestal 68, so that the exchange mold 82 is moved to the mold exchange table 61. From one pedestal 68 on the rotary table 2
It is transferred to the second seating surface 33 and is guided and positioned by the guide pins 31 ... Arranged around the seating surface 33. At this time, the cooling water supply / drainage coupler 34 is connected. Here, when the supply of hydraulic oil to the pipe system for raising the lift roller 62 is stopped, the rod of the hydraulic cylinder 72 is lowered by the built-in spring, and the replacement mold 82
And the roller support member 71 descends due to its own weight, and with this, each roller 70 retracts from the seating surface 33,
The lower surface of the flange F of the lower mold K2 of the replacement mold 82 is in close contact with the seating surface 33, and the movement of the replacement mold 82 is suppressed. Then the clamper 32
By supplying hydraulic oil to the narrow-fitting piping to narrowly attach the lower mold K2, the replacement mold 82 is firmly held on the seating surface 33 and the mold replacement is completed. Since this end is detected by the pressure switch PS provided in the narrow-wearing pipe, the coupler 74B on the support 75 is retracted and removed by this detection signal, the rotary table 22 rotates, and the exchange mold 82 is clamped. -By being positioned at the injection station S1, molding in the next step is performed.

As described above, according to the mold exchanging device 3 having the above-described structure, the mold K is brought into close contact with the seating surface 33 during injection molding and its movement is suppressed, and at the time of exchanging the mold, the roller 7 is used.
By moving 0 ... From the seating surface 33, the mold K can be moved very easily. This makes it possible to carry out and carry in the mold K in a shorter time, sufficiently correspond to the short rotation stop time of the rotary table 22, and substantially stop the molding operation without interruption. In addition, the dies can be exchanged within the molding cycle, and the work efficiency can be improved. Also, on the other hand,
Since the movement of the mold K is restricted during molding, the mold K can be stably placed on the seating surface 33, and the rotary table 22 can be mounted.
It is possible to effectively prevent the displacement of the mold K due to the rotation of the mold, the mold clamping force of the mold clamping device 23, and the like, and it is possible to perform accurate and reliable molding work.

Further, in this embodiment, as described above, the seating surface 3
The stepped portion 73 is formed on the outer peripheral side of the rotary table 22 of No. 3 and the movement of the die K is prevented by engaging the stepped portion 73 with the outer edge of the lower die K2 of the die K. It is possible to more reliably prevent the mold K from shifting. Since the height of the stepped portion 73 is set lower than the height when the lift roller 62 projects, the movement of the die K at the time of exchanging the die is not hindered by this.

[0025]

As described above, according to the present invention, the mold exchanging table is provided at the position corresponding to the mold exchanging position, and the die is held on the pedestal surface of the mold exchanging table connected to the seating surface of the rotary table. While forming a pedestal for forming a pedestal and providing a transfer means for transferring a mold between the pedestal and the seating surface, the seating surface is provided with a plurality of rollers capable of projecting and retracting from the seating surface. Since it is arranged so that the surface faces the pedestal side of the mold exchange table, the mold can be moved extremely smoothly by protruding the roller from the seating surface during mold replacement, and the mold can be moved in a short time. It becomes possible to change the mold. Also, during the injection molding work, the above-mentioned roller is retracted into the seating surface, so that the mold is firmly placed in close contact with the seating surface, and its movement and misalignment are suppressed, so accurate and reliable molding work is possible. It can be carried out.

[Brief description of drawings]

1 is a side view showing the configuration of a rotary injection molding machine according to the present invention.

FIG. 2 is a plan view of the rotary injection molding machine shown in FIG.

FIG. 3 is a front view of the rotary injection molding machine shown in FIG. 1 viewed from the mold opening device 24 side.

FIG. 4 is a plan view of a mold changing station S4 portion showing an embodiment of the present invention.

5 is an enlarged plan view of a seating surface portion of the embodiment shown in FIG.

6 is a diagram viewed from the X direction in FIG. 5.

7 is a sectional view taken along line YY in FIG.

8 is a hydraulic system diagram of a hydraulic drive system 63 of the embodiment shown in FIG.

[Explanation of symbols]

 1 Injection Device 2 Molding Device 3 Mold Exchange Device 22 Rotary Table 23 Mold Clamping Device 24 Mold Opening Device 28 Drive Device 31 Guide Pin 32 Clamper 33 Seating Surface 61 Mold Exchange Table 62 Lift Roller 63 Hydraulic Drive System 65 Base Surface 68 Pedestal 69 Pull pusher (transfer means) 70 Roller 71 Roller support member 73 Stepped portion 74 Coupler K, 81, 82 Mold S1 Mold clamping / injection station S2 Cooling station S3 Mold opening station S4 Mold exchange station

Claims (1)

[Scope of utility model registration request] 1. A rotating position of a mold, which is detachably mounted on a seating surface provided on a rotary table that rotates intermittently at a predetermined angle, in association with intermittent rotation of the rotary table. A mold exchanging device in a rotary injection molding machine for exchanging at a predetermined die exchanging position, wherein a die exchanging table is provided at a position corresponding to the die exchanging position. A pedestal for holding the mold is formed on the pedestal surface of the mold exchanging table connected to the seating surface, and a transfer means for transferring the mold between the pedestal and the seating surface is attached. On the other hand, on the seating surface, a plurality of rollers capable of projecting and retracting from the seating surface are arranged so as to extend from the seating surface toward the pedestal side of the mold exchanging table. Mold changing device in molding machine