JPH02196611A - Molding device for synthetic resin - Google Patents

Abstract

PURPOSE:To rotationally transfer at least three sets of molding dies in order and to shorten the time of a cycle by aggregating a molding process of foamed resin to three stages and also providing the stations correspondent to the respective stages. CONSTITUTION:A molding die 20 mold-clamped in a first station 12 is carried to a second station 14 by a dolly 28 and resin liquid is introduced thereinto. On the other hand, the first station 12 is made vacant by transfer of the molding die 20 and therefore the molding die 20 remaining on standby in a fourth station 18 is carried to the first station 12 by a traction dolly 126. The other molding die 20 remaining on standby in a third station 16 is carried to the fourth station 18 by a roller conveyor 110. Resin liquid is introduced into the molding die 20 after carried to the second station 14 and thereafter carried to the third station 16 by a traction dolly 84. In such a way, an efficient molding process is performed so that idle time is not caused with respect to three sets of molding dies 20.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a synthetic resin molding device, and in particular, the layer details include mold clamping, injection of resin liquid, waiting for the foamed resin liquid to harden, and then taking out the product. The present invention relates to a synthetic resin molding device that integrates a series of processes and thereby makes it possible to achieve high production efficiency.

[Background of the Invention] Generally, the process of molding a resin product, in which a molded product is obtained by injecting a resin liquid into a mold, includes a plurality of steps as described below. That is, for example, the process includes a step of setting a skin material in a mold consisting of a male mold and a female mold, closing the male mold and female mold, a step of injecting a resin liquid into the mold, and a step of opening the mold. This is the process of removing the molded product.

By the way, since it takes several minutes for the resin liquid to harden after it is injected into the mold, the time during that time becomes loss time. Therefore, attempts have been made to improve productivity by connecting processing stations where each process is performed with a conveyor and sequentially proceeding with the process while conveying a large number of molds. However, resin products include, for example,
There are large products such as automobile instrument panels, and the molds used to mold such resin products are expensive, and the number of molds must be limited due to product cost. In such a case, two molds are prepared and a shuttle type is used in which these molds are moved back and forth alternately (Japanese Patent Application Laid-open No. 59-2
29325), there is a limit to the shortening of cycle time.

On the other hand, reducing the time required for operations associated with mold clamping and mold opening is also an essential factor for improving efficiency. In particular, in the case of molding the instrument panel mentioned above, there is the work of assembling the mounting brackets and ducts into the male mold to form the area where the instruments will be housed, and setting the skin material with a textured surface onto the female mold. This work is required before mold clamping.

At this time, since the product molding surfaces of the male and female molds face each other, there is a problem in that the working posture is poor and the production efficiency is not improved much.

In the prior art, for example, there is a device in which a guide holder to which a mold is fixed is configured to be swingable (Japanese Patent Application Laid-open No. 58-3
(Refer to Publication No. 8417), the inclination angle of the mold is insufficient,
Furthermore, since the tilting directions of the upper and lower molds are the same, workability has not been improved.

[Object of the Invention] The present invention has been made to overcome the above-mentioned disadvantages, and includes a station where mold clamping, mold opening, and other incidental operations are performed, a station where resin liquid is injected, and a station where resin liquid is injected. The mold is configured so that it is transported sequentially between stations where it waits for curing, and at the stations where mold clamping, mold opening, etc. are performed, the upper and lower molds that make up the mold are each reversed in opposite directions. It is an object of the present invention to provide a synthetic resin molding apparatus that can shorten cycle time and improve workability by making it possible to achieve high efficiency in the process of molding resin products.

[Means for Achieving the Object] In order to achieve the above-mentioned object, the present invention includes injection of resin liquid, curing of the resin liquid, and removal of the molded product after clamping a mold consisting of an upper mold and a lower mold. A synthetic resin molding apparatus for molding a molded product of a desired shape by performing a series of steps up to It consists of a second station equipped with a resin liquid injection device into the tightened mold, and a third station that waits for the injected resin liquid to harden. The invention is characterized in that at least three or more molds are connected in a loop shape and are rotatably movable between the respective stations.

[Embodiments] Next, preferred embodiments of the synthetic resin molding apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a plan view showing the arrangement of stations configuring a synthetic resin molding apparatus 10 according to this embodiment. That is, this synthetic resin molding apparatus 10 includes a first station 12, a second station 14, and a JR3 station 1.
6. Consists of four work stations: 4th station 18.

Further, the synthetic resin molding apparatus 10 is equipped with at least three molds 20, and these first to fourth stations 12, 14, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20 are connected in a loop via conveyance means.
These molds 2 are moved sequentially between 16 and 18.
A predetermined operation for 0 is performed at each work station.

Here, to explain the structure of the mold 20, the mold 20 consists of an upper mold 21 and a lower mold 22. A resin liquid injection head, which will be described later, is inserted into the upper mold 21, and the upper mold 21 and the lower mold The resin liquid is injected into a cavity defined inside by the product molding surface of the mold 22. In this embodiment, this mold 20 is used to mold an instrument panel, which is an interior part of an automobile.

First, the configuration of the first station 12 will be explained in order. The first station 12 includes a base 24;
A reversing table 25, which is rotatable in the direction of the arrow in FIGS. 1 and 2, is pivotally supported on the base 24. The reversing table 25 is supported via support shafts 26a and 26b, and as shown in FIG.
are concatenated. In this case, by extending the piston rod 27a of the reversing cylinder 27, the reversing table 2
5 is configured to be able to be rotated by 45 degrees (see FIG. 5).

Further, on the reversing table 25, the mold 20 is placed via a cart 28 serving as a conveyance means.

This trolley 28 is transferred to the first station 1 via a transport platform 29.
The vehicle is configured to be able to travel along rails 30a and 30b extending to the second station 14 connected to the station 2. That is, on one end side of this truck 28, there is a rod 34 extending from a traveling cylinder 32 having a stroke length corresponding to the travel distance of the truck disposed at the second station 14.
are concatenated.

The reversing table 25 is provided with locator pins 36a and 36b that protrude from its upper surface and fit into the bottom surface of the mold 20 to position it. As shown by the broken line in FIG. 5, it is operated by driving the cylinder. Similar locator pins 38a, 38b are also provided on truck 28.

2 and 4, the first station 1
2 shows a press device 40 for clamping and opening the mold 20 placed on a trolley 28. The press device 40 includes a fixed platen 44 located at the top of columns 42a to 42d erected on the base 24, and a ram 46 located below the fixed platen 44 and movable up and down.

The fixed platen 44 has a hydraulic cylinder 48 that raises and lowers the ram 46.
a, 48b are provided, and these hydraulic cylinders 48a, 48
The piston rods 50a and 50b of b are connected to the ram 46. Further, the ram 46 is provided with a holding frame 52 that holds the upper die 21 of the mold 20 and moves it up and down integrally with the ram 46. The holding frame 52 is rotatably supported by a support shaft 54. In this case, a pinion gear 56 is pivotally attached to one end of the support shaft 54, and a rack member 58 that meshes with the pinion gear 56 is connected to the cylinder 6o. In this way, the rack member 58, which is linearly displaced under the driving action of the cylinder 60, converts its movement into a rotational movement via the pinion gear 56, and as can be understood from FIG. 5, the lower die 22 is placed on it. Arrow C opposite to the overturning direction of the reversing table 25
The structure is such that the holding frame 52 can be reversed by 120° in the direction. Note that the lower end of the holding frame 52 has a fourth
As shown in the figure, clampers 62a to 62, which are clamping means for fixing the upper die 21 to the holding frame 52,
2d are arranged at four locations.

The clampers 62a to 62d are configured to move a dog into and out of engagement with the flange portion of the upper part of the lower die 22 by cylinder drive.

Next, the second station 14 will be explained.

A trolley 28 is mounted on the upper surface of the base 64 of the second station 14.
a locator pin 66a that engages with and positions the trolley;
, 66b are provided. Further, a pump unit 72 for injecting resin liquid into the mold 20 is installed on a mounting base 70 supported by columns 68 a and 68 b erected on the base 64 . An injection head 74 constituting this pump unit 72 is a cylinder 7 fixed to a mounting base 70.
It is connected to the tip of the piston rod 78 of No. 6.

Next, in FIG. 1, the third station 16 and the fourth station 18 perform substantially the same process, that is, the process of curing the foamed resin injected into the mold 20. is the first station 12,
Since the time required is longer than the process performed at the second station 14, there are two stations, and two molds 20 are always on standby.

Between the third station 16 and the second station 14, rails 82a and 82b are laid on the conveyor table 80.
A mold 20 is movably connected to the top of the mold 2.
A towing trolley 84 serving as a transport means for transporting 0 runs between the third station 16 and the second station 140.

First, the base 86 of the third station 16 and the carrier 8
Guide rails g3a and 88b for guiding the towing cart 84 are laid on the upper surface of the 0. Therefore, the tow truck 84
As shown in FIG. 3, the main body 94 is provided with a travel motor 96 as a drive source, and a pinion 98 attached to the rotating shaft of this travel motor 96 is connected to the guide rail 88a188b. It meshes with a rack 100 extending in parallel. Further, the main body portion 94 is provided with a connection mechanism with the mold 20. That is, this coupling mechanism is substantially comprised of a cylinder 104 for moving the bin 102 in and out, which engages an engagement plate 101 fixed below the lower die 22.

Next, at the third station 16 and the fourth station 1B, a roller conveyor 110 is provided as a conveyance means for conveying the mold 20. That is, the rotation of a motor 112 disposed at one end of the third station 16 is transmitted via a chain 116 to a number of transport rollers 114 disposed at predetermined intervals so as to be freely removable.

The fourth station 18 is constructed similarly to the third station 14. In this case, the base 120 of the fourth station 18 and the base 24 of the first station 12 are connected by a conveyor table 122, and this conveyor table 120 is connected to the base 24 of the first station 12.
The mold 20 can be moved from the fourth station 18 to the first station 12 along rails 124a, 124b laid down on the mold 22. Note that, similarly to the third station 16, a traction cart 126 for pulling the mold 20 as a conveying means is provided so as to be movable along guide rails 128a and 128b. This tow truck 126
The binion that engages with the rack 130 extending parallel to the guide rails 128a and 128b rotates and moves freely, and has the same structure as the towing cart 84 disposed at the third station 16, and therefore has a corresponding one. Components will be given the same reference numerals and their explanation will be omitted.

Note that, directly above the fourth station 18, as shown in FIG. 4, a work platform 132 on which a worker is placed is provided.

The synthetic resin molding apparatus according to this embodiment is basically constructed as described above, and its operation and effects will be explained next.

First, the first to fourth stations 12.14.16.1
The function of each station will be explained in turn in relation to the process performed in step 8.

As shown in FIG. 5, at the start of the process of molding an instrument panel as a synthetic resin product using the lower mold 22, the lower mold 22, which is placed on the reversing table 25 at the first station 12, is placed on a horizontal surface. The upper die 21 is tilted at 45°, and the upper die 21 is inverted in the opposite direction to the lower die 22. Then, one worker is assigned to the upper mold 21 and the lower mold 22, and in this case, the worker E sets various metal fittings that are components of the instrument panel on the cavity molding surface of the upper mold 21, Worker F places a synthetic leather skin material similar to real leather on the surface of the lower mold 2.
2. Perform the work of attaching it to 2.

In this embodiment, an instrument panel is formed using foamed urethane foam as a core material and integrally includes mounting fittings for instruments and ducts for forming boxes for storing objects.

Such preparatory work is carried out because the lower mold 22 and upper mold 21 are tilted so that the working posture is comfortable for the worker ESF.
Executed efficiently. In addition, since the upper mold 21 and the lower mold 22 are reversed in the opposite direction, the upper mold 21 and the lower mold 2
Regarding 2, it is possible to assign one worker at a time to share the work, and the work time can be shortened.

After the above operations are completed, the piston rod 27a of the reversing cylinder 27 retreats, the reversing table 25 tilts in the direction of arrow B, and the lower die 22 becomes horizontal.

Regarding the lower die 21 held by the ram 46 of the press device 40 via the holding frame 52, the rack member 58 connected to the cylinder 60 is also displaced upward. This rack member 58 meshes with a pinion gear 56 attached to a support shaft 54 on which the holding frame 52 is supported, so that the upper die 58 which is integral with the holding frame 52
1 rotates 120 degrees in the direction of the arrow and becomes horizontal.

Next, the ram 46 is lowered and the upper mold 21 is moved against the lower mold 22.
mate. In this case, the hydraulic cylinders 48a, 48b
The pistons 07 and 50a and 50b extend and the ram 46 descends. As a result, the mold is closed as shown in Figure 4,
Thereafter, the dogs of the clampers 62a to 62d are released from the flange portion of the upper mold 21 to release the connection between the holding frame 52 and the upper mold 21. Further, the locator pins 36a and 36b that were engaged with the bottom surface of the lower mold 22 are pulled out, while the locator pins 38a and 38b provided on the carriage 28 are engaged with the bottom surface of the lower mold 22. Thereby, the trolley 28 is in a state where it can transport the mold 20.

Then, the trolley 28 is transferred to the second station 14. That is, in FIGS. 1 and 2, the traveling cylinder 320 rod 34 provided at the second station 14 is retracted into the cylinder 32, and this rod 3
The trolley 28 connected to the mold 4 moves along the rails 30a and 30b to the second station 14 with the mold 20 on it. The mold 20 that has moved to the second station 14 in this way stops at a predetermined position, and then moves to the base 64.
The locating turbines 66a and 66b provided at two locations in the lower mold 22
The mold 20 is positioned by latching onto the bottom surface of the mold 20.

Subsequently, the pump unit 72 shown in FIG. 2 is operated to inject a resin liquid of foamed resin, for example, hard foamed urethane, into the mold 20. In this case, the injection head 74 is displaced downward under the driving action of the cylinder 76, and the injection head 74 is moved downwardly under the driving action of the cylinder 76.
is fitted onto a sprue (not shown) of the upper die 21. After that,
A resin liquid is injected into a not-illustrated cavity defined within the mold 20 via the injection pad 74 .

When injection of the resin liquid is finished, the piston rod 78 of the cylinder 76 moves back, the injection head 74 rises, and the mold 2
0 moves to the third station 16.

In this case, the tow truck 84 transports the mold 20 to the third station 16 in the following manner. First, at the second station 14, the locator bin 66a166b comes off the bottom surface of the lower mold 22, so that the mold 20 becomes movable. Then, as shown in FIG. 3, the tow truck 84, which was initially located at the position indicated by the two-dot chain line, moves by itself to the position indicated by the solid line. That is, the motor 96 is driven and the pinion 98 that meshes with the rack 100 rotates, so that the tow truck 84 is self-propelled. Then, the traction cart 84 stops at a predetermined connection position with the mold 20, the cylinder 104 is biased, and the pin 102 latches to the engagement plate 101 on the mold 20 side. Thereafter, the motor 96 is driven to rotate in the opposite direction in the tow truck 84, and the mold 2
0 to the third station 16. Thereafter, the mold 20 is in a state of waiting for the foamed resin to harden.

Note that, as a result of the mold 20 moving to the third station 16, the cart 28, which has become empty, returns to the first station 12 again by the drive of the traveling cylinder 32.

When transferring the mold 20 from the third station 16 to the fourth station 18, the roller conveyor 110 is driven. Motor 11 that is a driving source for roller conveyor 110
2 rotations to each conveying roller 114 via a chain 116.
The mold 20 is transferred to the fourth station 18.

The operation of the towing truck 126 for transferring the mold 20 from the fourth station 18 to the fourth station 18 is exactly the same as the operation of the towing truck 84 described above, and therefore, the explanation thereof will be omitted. In this way, the third station 16.
The mold 20 whose resin liquid has hardened by waiting at the 14 station 18 returns to the first station 12, where the mold is opened and the molded instrument panel is taken out.

When the mold 20 arrives at the first station 12, the fourth
In the figure, the locator pin 36a of the inversion table 25,
36b latches to the bottom surface of the lower mold 22. As a result, the mold 20 is positioned with respect to the reversing table 25, and as will be described later, the mold 20 is prevented from moving when the reversing table 25 is tilted.

Next, in the press device 40, a hydraulic cylinder 48a,
The ram 46 is lowered under the driving action of the ram 48b.
6 and an integral holding frame 52 and the upper mold 21 are connected. In this case, the clampers 62a to 62 provided on the holding frame 52
The dog d is engaged with the 7-run part of the upper die 21. After the holding frame 52 and the upper mold 21 are thus connected, the hydraulic cylinders 43a and 48b are driven and the ram 46 is raised. Then, as shown in FIG. 5, the rack member 58 connected to the cylinder 60 is displaced downward, and the pinion gear 56
The upper mold 21, which is integral with the holding frame 52, rotates 120 degrees in the direction of arrow C around the support shaft 54 to which the holding frame 52 is attached.

On the other hand, regarding the lower mold 22 on the inversion table 25,
The piston rod 27a of the reversing cylinder 27 extends,
Inversion table 2 connected to this piston rod 27a
5 rotates 45 degrees in the six directions of arrows opposite to the upper mold 21 using the support shafts 26a and 26b as fulcrums.

After the upper die 21 and the lower die 22 are inverted in this way, workers E and F, who are placed on the sides to which they are inverted, respectively, perform work to take out the molded product, and once that work is completed, the above-mentioned steps are taken to start the process again. Perform various preparatory work.

The functions of each station have been explained above, but in actual operation, the three molds 20 installed in the synthetic resin molding apparatus 10 are, in principle, located at the first station 12.
, the third station 16, and the fourth station 18. Then, the three molds 20 are rotated in order to proceed with the continuous process. That is, the mold 20 that has been clamped at the first station 12 is injected with resin liquid at the second station 14 by the cart 28. On the other hand, since the first station 12 becomes vacant due to the movement of the mold 20, the mold 20 that was waiting at the fourth station 18 is transported to the first station 12 by the tow truck 126, and the mold 20 is transported to the third station 12 by the tow truck 126.
Another mold 20 waiting on the roller conveyor 110
It is conveyed to the fourth station 18 by. The mold 20 transported to the second station 14 is injected with resin liquid, and then transported to the third station 16 by a towing cart 84. In this way, an efficient molding process is performed so that no idle time occurs for the three molds 20.

[Effects of the Invention] As described above, according to the present invention, the foamed resin molding process is integrated into three processes, and stations corresponding to each process are provided.

That is, a first station that performs a process consisting of mounting the component to the mold, clamping the mold, and removing the molded product;
A second station for injecting the foamed resin liquid and a third station for curing the injected resin liquid are provided, and the processes at each station are integrated.
By sequentially rotating at least three molds, cycle time can be shortened, and in particular, two third stations are provided to wait for the curing of molded products that require a long time. The process is further made more efficient by constantly waiting for the two molds to cure their molded products at this station.

Also, at the first station, the upper mold and lower mold are reversed,
Moreover, since the structure is configured so that the reversal direction is opposite, two workers can simultaneously carry out tasks such as mounting parts on the upper mold and lower mold and taking out the molded product. Other tasks can also be performed in a comfortable posture, which has the advantage of improving work efficiency and efficiency.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments.
Of course, various improvements and changes in design are possible without departing from the gist of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the arrangement of the respective stations constituting the synthetic resin molding apparatus according to the present invention, and FIG.
A side view of the station and the second station, FIG.
A side view of the station and the third station, FIG. 4 is a side view of the station and the third station, and FIG.
5 is a side view of the station and the first station, with the mold in a closed state; FIG. 5 is a side view of the mold shown in FIG. 4 when the mold is opened; FIG. 10...Synthetic resin molding device 12.14.16.18...Station 20...
Molding mold 25... Inversion table 26a, 26b
...Spindle 27...Reversing cylinder 28...Dolly 32...Travelling cylinder 40...Press device 44...Fixed plate 46...Ram 4
8a, 48b...Hydraulic cylinder 52...Holding frame
56... Pinion gear 58... Rack member
72...Pump unit 84...Tow truck 9
6... Travel motor 98... Pinion 100-
Rack 110...roller conveyor

Claims (8)

[Claims] (1) After clamping the mold consisting of an upper mold and a lower mold, a series of steps are carried out including injection of resin liquid, hardening of the resin liquid, and removal of the molded product to mold the molded product in the desired shape. A synthetic resin molding apparatus comprising: a first station equipped with a device for raising and lowering an upper mold to open and close the mold; and a second station equipped with a resin liquid injection device into the clamped mold. , and a third station that waits for the injected resin liquid to harden.These first to third stations are connected in a loop via a conveying means, and at least three or more molds are placed in each station. A synthetic resin molding device characterized by being configured so that it can be rotated freely between the two locations. (2) In the apparatus according to claim 1, the apparatus of the first station is rotatably supported on a base via a support shaft, and is rotated by an inversion table on which the lower mold is placed and a ram which can be raised and lowered. A synthetic resin molding device characterized by having a holding frame which is freely pivoted via a support shaft and holds an upper mold. (3) The apparatus according to claim 2, wherein the holding frame for holding the upper mold and the reversing table on which the lower mold is placed are configured to be reversible to predetermined working positions in opposite directions. Resin molding equipment. (4) In the device according to claim 2, the pinion gear attached to the support shaft of the holding frame is engaged with a rack connected to a drive source provided on the ram, and the rack is linearly displaced by the drive source, so that the holding frame is A synthetic resin molding device characterized by rotating an upper mold integrated with a predetermined angle. (5) The synthetic resin molding apparatus according to claim 4, wherein the holding frame is configured to rotate at least 90 degrees or more with respect to a horizontal plane. (6) In the apparatus according to claim 2, a lower mold is placed on the reversing table via a cart for transporting the mold to the second station, and the reversing table is moved against a horizontal plane under the driving action of a cylinder. A synthetic resin molding device characterized in that it is configured to be rotatable by at least 30 degrees. (7) The synthetic resin molding apparatus according to claim 1, wherein the third station is comprised of two stations in order to substantially keep two molds on standby. (8) The apparatus according to any one of claims 1 to 7, characterized in that the mold is moved between the second station and the third station and between the third station and the first station by a self-propelled traction means. Synthetic resin molding equipment.