JPH0637067B2 - Synthetic resin molding equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a synthetic resin molding apparatus, and more specifically, a series of processes such as mold clamping, injection of resin liquid, waiting for curing of foamed resin liquid, and then taking out of product. The present invention relates to a synthetic resin molding device that can achieve high production efficiency by consolidating the steps of.

BACKGROUND OF THE INVENTION Generally, a molding process of a resin product by injecting a resin liquid into a molding die to obtain a molded product includes a plurality of steps as described below. That is, for example, a step of setting a skin material on a molding die composed of a male die and a female die, closing the male die and the female die, a step of injecting a resin liquid into the molding die, and opening the molding die. It is a process of taking out the molded product.

By the way, since it takes about several minutes for the resin liquid to be cured after being poured into the molding die, the time during that time becomes a loss time. Therefore, an attempt has been made to improve productivity by connecting a processing station where each step is performed by a conveyor and sequentially advancing the steps while conveying a large number of molds. However, for resin products, for example,
There are large-sized products such as instrument panels for automobiles, the molding dies used for molding such resin products are expensive, and the number of molding dies has to be naturally limited due to the product cost. In such a case, two molding dies are prepared, and a shuttle type in which they are alternately reciprocated is dealt with (Japanese Patent Laid-Open No. 59-2293).
There is a limit to the reduction of cycle time.

On the other hand, shortening the time required for work 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 described above, the work of incorporating the mounting brackets and ducts into the male mold to form the site for storing and installing the instruments, and the setting of the skin material with the grain pattern on the surface to the female mold The work to do is required before mold clamping. At this time,
Since the male and female product molding surfaces face each other, there is a disadvantage that the working posture is bad and the production efficiency is not improved so much.

In the prior art, for example, there is one in which a die holder to which a mold is fixed is swingable (Japanese Patent Laid-Open No. 58-38417).
However, the workability has not been improved because the mold tilt angle is insufficient and the upper and lower mold tilt directions are the same.

[Object of the Invention] The present invention has been made in order to overcome the above-mentioned inconveniences, and includes a station for performing mold clamping, mold opening, and other associated operations, a station for injecting a resin liquid, and a resin The mold is configured to be sequentially fed between the stations waiting for curing, and at the stations where mold clamping and mold opening are performed, the upper mold and lower mold that make up the mold are reversed in opposite directions. It is an object of the present invention to provide a synthetic resin molding apparatus capable of shortening the cycle time and improving workability, and achieving high efficiency of the molding process of a resin product, by making it possible.

[Means for Achieving the Object] In order to achieve the above object, the present invention provides a first station having a mechanism for clamping an upper die and a lower die for a molding die, and the die clamping. A second station equipped with a mechanism for injecting a resin liquid into the molding die, and a third station for waiting for curing of the injected resin liquid,
In the synthetic resin molding device in which the first to third stations are connected in a loop shape via a conveying means, and the molding die is movably arranged between the respective stations, the first station is constituted. The mold and the lower mold are held by a support shaft, and are configured to be rotatable in different directions via the support shaft when the mold is opened.

[Embodiment] Next, a preferred embodiment of the synthetic resin molding apparatus according to the present invention will be given and described in detail below with reference to the accompanying drawings.

FIG. 1 is a plan view showing the arrangement relationship of each station constituting the synthetic resin molding device 10 according to the present embodiment. That is, the synthetic resin molding apparatus 10 is the first station 1
It is composed of four work stations, that is, a second station 14, a third station 16, and a fourth station 18.
Further, at least three molding dies 20 are provided in the synthetic resin molding device 10 and are sequentially fed between the first to fourth stations 12, 14, 16 and 18 which are connected to each other in a loop shape by a conveying means. Predetermined work for these molds 20 is performed at each work station while moving to.

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

First, the configuration will be described in order from the first station 12. The first station 12 includes a base 24, and a reversing table 25 that is rotatable in the arrow direction in FIGS. 1 and 2 is pivotally supported on the base 24. The reversing table 25 is supported via supporting shafts 26a and 26b, and a piston rod 27a of a reversing cylinder 27 is connected to the reversing table 25 as shown in FIG. In this case, the reversing table 25 can be reversed by 45 ° by extending the piston rod 27a of the reversing cylinder 27 (see FIG. 5).

Further, in the reversing table 25, the molding die 20 is placed via a dolly 28 serving as a conveying means. The carriage 28 is configured to be able to travel along rails 30a and 30b extending to a second station 14 connected to the first station 12 via a carrier 29. That is, a rod 34 extending from a traveling cylinder 32 having a stroke length corresponding to the traveling distance of the truck disposed in the second station 14 is connected to one end of the truck 28. The reversing table 25 is provided at its end with locator pins 36a and 36b which project from the upper surface of the reversing table 25 and are fitted to the bottom surface of the molding die 20 to position the locator pins 36a and 36b. As shown by the broken line in FIG. 5, it is operated by driving the cylinder. Similar locator pins 38a and 38b are also arranged on the truck 28.

Then, in FIGS. 2 and 4, the first station 12 is shown.
At, a press device 40 for clamping and opening the molding die 20 placed on the carriage 28 is shown. The press device 40 includes columns 42a to 42d that are erected on the base 24.
It includes a fixed platen 44 located at the top of the base plate and a ram 46 which is located below the fixed platen 44 and can move up and down. The stationary platen 44 is provided with hydraulic cylinders 48a and 48b for moving the ram 46 up and down. The piston rods 50a and 50b of the hydraulic cylinders 48a and 48b are rams.
Connected with 46. In addition, the ram 46 is provided with a holding frame 52 that holds the upper die 21 of the forming die 20 and moves up and down integrally with the ram 46. The holding frame 52 is rotatably supported by a support shaft 54. In this case, the pinion gear 56 is attached to one end of the support shaft 54.
A rack member that is axially mounted and meshes with this pinion gear 56.
58 is connected to the cylinder 60. Thus, the cylinder 60
The rack member 58, which is linearly displaced under the driving action of the above, converts the operation into a rotational operation through the pinion gear 56, and as can be understood from FIG. 5, the lower die 22 is placed on the reversing table.
The holding frame 52 can be inverted by 120 ° in the direction of arrow C, which is opposite to the direction in which the 25 rolls over. As shown in FIG. 4, clampers 62a to 62d, which are clamping means for fixing the upper die 21 to the holding frame 52, are provided at the lower end of the holding frame 52 at four positions. . The clampers 62a to 62d are configured so that a dog that engages with a flange portion on the upper portion of the lower die 22 is moved in and out by driving the cylinder.

Next, the second station 14 will be described. Locator pins 66a and 66b are provided on the upper surface of the base 64 of the second station 14 to engage with the carriage 28 and position the carriage. Further, a pump unit 72 for injecting the resin liquid into the molding die 20 is installed on the mounting base 70 supported by the columns 68a and 68b provided upright on the base 64. The injection head 74 constituting the pump unit 72 is connected to the tip of the piston rod 78 of the cylinder 76 fixed to the mounting base 70.

Next, in FIG. 1, the third station 16 and the fourth station 18 have substantially the same process, that is, the molding die 20.
The process of curing the foamed resin injected into the container is performed. Since this curing process takes a longer time than the process performed in the first station 12 and the second station 14, two stations are used at all times. Put the two molds 20 on standby.

Between the third station 16 and the second station 14, the rails 82a and 82b laid on the carrier 80 are mounted on the mold.
20 is movably connected, and a towing carriage 84 as a transfer means of the molding die 20 travels between the third station 16 and the second station 14.

First, a base 86 of the third station 16 and a guide rail 88a for guiding the towing carriage 84 on the upper surface of the carrier 80,
88b is laid. Therefore, in the tow truck 84, as shown in FIG. 3, a main body 94 is provided with a traveling motor 96 as a drive source, and a pinion 98 attached to the rotary shaft of the traveling motor 96. Engages with a rack 100 extending parallel to the guide rails 88a, 88b. Also, the main body 94
Is provided with a connection mechanism with the molding die 00. That is, substantially, this connecting mechanism is composed of a cylinder 104 for inserting and removing the pin 102 that engages with the engaging plate 101 fixed to the lower part of the lower mold 22.

Next, at the third station 16 and the fourth station 18, a roller conveyor 110 is provided as a conveying means for transferring the molding die 20. That is, the rotation of the motor 112 arranged on one end side of the third station 16 is transmitted via the chain 116 to the conveying rollers 114 arranged to be rotatable in large numbers at predetermined intervals.

The fourth station 18 has the same structure as the third station 14. In this case, the fourth station 18
The base 120 of the first station 12 and the base 24 of the first station 12 are connected by a carrier 122, and the mold 20 is moved from the fourth station 18 to the first station 12 along rails 124a and 124b laid on the carrier 122. You can move.
Note that, as with the third station 16, the towing carriage 126 that pulls the forming die 20 as the conveying means is the guide rails 128a and 128b.
It is provided so as to be movable along. This tow truck 126
Is a rack 130 that extends parallel to the guide rails 128a and 128b.
The pinion that meshes with the rotator freely rotates and has the same structure as the tow truck 84 provided at the third station 16. Therefore, corresponding components are designated by the same reference numerals and their description is omitted. Is omitted.

Note that, immediately above the fourth station 18, as shown in FIG. 4, a work platform 132 on which workers are arranged is provided.

The synthetic resin molding apparatus according to the present embodiment is basically configured as described above, and its operation and effect will be described next.

First, the operation of each station will be sequentially described in relation to the steps performed in the first to fourth stations 12, 14, 16, and 18.

As shown in FIG. 5, at the start of the step of molding the instrument panel as a synthetic resin product for the lower die 22, the lower die 22 placed on the reversing table 25 at the first station 12 is placed on the horizontal plane. The upper mold 21 is in a state of being tilted at an angle of 45 °, while the upper mold 21 is inverted in a direction opposite to that of the lower mold 22. Then, the workers are assigned to the upper mold 21 and the lower mold 22 one by one, and in this case, the worker E sets various metal fittings, which are components of the instrument panel, on the cavity molding surface of the upper mold 21, The worker F performs a work of mounting a synthetic leather skin material similar to genuine leather on the surface of the lower mold 22.

In the present embodiment, an instrument panel is integrally formed by using urethane foam as a core material and integrally forming a mounting metal fitting for instruments and a duct for forming a box for storing an object.

For such preparatory work, the lower mold 22 and the upper mold 21 are exactly the workers E,
Since F is inclined so that the work posture is easy for F, the work can be efficiently performed. Further, since the upper mold 21 and the lower mold 22 are reversed in the reverse direction, it is possible to arrange a worker for each of the upper mold 21 and the lower mold 22 to share the work,
Work time can be shortened.

After the above work is completed, the piston rod 27a of the reversing cylinder 27 retracts, the reversing table 25 tilts in the direction of arrow B, and the lower die 22 becomes horizontal. With respect to the lower die 21 held by the ram 46 of the pressing device 40 via the holding frame 52, the rack member 58 connected to the cylinder 60 is also displaced upward. Since the rack member 58 meshes with the pinion gear 56 attached to the support shaft 54 on which the holding frame 52 is supported, an upper mold integrated with the holding frame 52 is formed.
21 turns 120 ° in the direction of arrow D and becomes horizontal.

Next, the ram 46 is lowered to fit the upper mold 21 to the lower mold 22. In this case, the piston rods 50a, 50b of the hydraulic cylinders 48a, 48b extend and the ram 46 descends. As a result, the mold clamping state shown in FIG.
To disconnect the upper mold 21 from the clampers 62a to 62a.
The dog of d releases from the flange part of the upper mold 21. In addition, the locator pins 36a, 36 that were engaged with the bottom surface of the lower mold 22.
b is removed, while the locator pins 38a, 38b provided on the carriage 28 engage with the bottom surface of the lower mold 22. This allows
The carriage 28 is in a state in which the mold 20 can be transported.

Then, the carriage 28 is transferred to the second station 14. That is, in FIG. 1 and FIG. 2, the rod 34 of the traveling cylinder 32 provided in the second station 14 is retracted into the cylinder 32, and the dolly 28 connected to the rod 34 forms the forming die 20. While still on, move to the second station 14 along the rails 30a and 30b. The molding die 20 thus moved to the second station 14 stops at a predetermined position, and then the locator pin 66 provided at two locations on the base 64.
The a and 66b are latched on the bottom surface of the lower die 22, and the molding die 20 is positioned.

Subsequently, the pump unit 72 shown in FIG. 2 is operated to supply a foamed resin, for example, a resin liquid of hard urethane foam to the molding die 20.
Inject into. In this case, the injection head 74 is displaced downward under the driving action of the cylinder 76, and the injection head 74 is fitted into the sprue (not shown) of the upper die 21. After that, the injection head 74
The resin liquid is injected into a cavity (not shown) defined in the molding die 20 via the.

When the injection of the resin liquid is completed, the piston rod 78 of the cylinder 76 retreats and the injection head 74 rises, and the molding die 20 moves to the third position.
Move to station 16. In this case, the tow truck 84 conveys the mold 20 to the third station 16 as follows. First, at the second station 14, the locator pin
When the 66a and 66b are removed from the bottom surface of the lower die 22, the molding die 20 becomes movable. Then, as shown in FIG. 3, the tow truck 84 originally located at the position indicated by the chain double-dashed line
Is self-propelled to the position indicated by the solid line. That is, when the motor 96 is driven and the pinion 98 that meshes with the rack 100 rotates, the tow truck 84 moves by itself. Then, the tow truck 84 stops at a predetermined connection position with the molding die 20, and the cylinder
104 is biased so that the pin 102 latches to the engaging plate 101 on the molding die 20 side. After that, the motor 96 in the tow truck 84
Is driven so as to rotate in the reverse direction, and the molding die 20 is conveyed to the third station 16. After that, the molding die 20 is in a state of waiting for the foamed resin to cure. The mold 20 is the third
As a result of moving to the station 16, the trolley 28 that has become an empty vehicle is driven again by the driving cylinder 32 to the first station.
I will return to 12.

Mold from 3rd station 16 to 4th station 18
When transferring 20, the roller conveyor 110 is driven. The molding die 20 is transferred to the fourth station 18 by transmitting the rotation of the motor 112, which is the drive source of the roller conveyor 110, to each of the conveying rollers 114 via the chain 116.

Mold 4 from 4th station 18 to 4th station 18
The operation of the towing truck 126 for transferring the vehicle is exactly the same as the operation of the towing truck 84 described above, and therefore, the description thereof will be omitted. In this way, the molding die 20 in which the resin liquid has hardened by standing by at the third station 16 and the fourth station 18 returns to the first station 12 again, where the mold is opened and the instrument panel, which is a molded product, is taken out. Is done.

When the molding die 20 arrives at the first station 12, the locator pins 36a and 36b of the reversing table 25 are latched to the bottom surface of the lower die 22 in FIG. As a result, the molding die 20 is positioned with respect to the reversing table 25, and movement of the molding die 20 when the reversing table 25 is tilted is prevented, as will be described later.

Next, in the press device 40, the hydraulic cylinders 48a, 48b
The ram 46 is lowered under the driving action of the ram 46, and the holding frame 52 integrated with the ram 46 and the upper die 21 are connected. In this case, the holding frame 52
The dogs of the clampers 62a to 62d provided on the above are engaged with the flange portion of the upper die 21. As a result, after the holding frame 52 and the upper die 21 are connected, the hydraulic cylinders 48a and 48b are driven to raise the ram 46. Then, as shown in FIG. 5, the rack member 58 connected to the cylinder 60 is displaced downward, and the holding frame 52 is centered on the support shaft 54 to which the pinion gear 56 is attached.
The upper mold 21, which is integral with, rotates 120 ° in the direction of arrow C.

On the other hand, in the lower die 22 on the reversing table 25, the piston rod 27a of the reversing cylinder 27 extends, and the reversing table 25 connected to the piston rod 27a has the support shaft 26.
Around the a and 26b as fulcrums, it rotates 45 ° in the direction of arrow A opposite to the upper mold 21.

After the upper mold 21 and the lower mold 22 are inverted in this way, the workers E and F arranged on the sides to be inverted respectively perform the work of taking out the molded product, and when the work is completed, the above-mentioned procedure for starting the process is restarted. Perform the preparatory work.

Although the operation of each station has been described above, in actual operation, the three molding dies 20 provided in the synthetic resin molding apparatus 10 are basically the first station 12, the third station
Located at Station 16 and Fourth Station 18. Then, the three molding dies 20 are rotated in a progressive manner so that a continuous process is performed. That is, the molding die 20 clamped at the first station 12 is secondarily moved by the carriage 28.
At the station 14, resin liquid is injected. On the other hand, since the first station 12 is vacated by the movement of the molding die 20,
Mold 20 waiting at station 18 is pulled by trolley 126
While being conveyed to the first station 12 by means of the roller conveyor 110, another mold 20 waiting at the third station 16 is conveyed to the fourth station 18 by means of the roller conveyor 110. The molding die 20 conveyed to the second station 14 is injected with the resin liquid, and then is moved to the third station 16 by a towing truck 84.
Is transported by. In this way, an efficient molding process is performed so as not to cause idle time for the three molds 20.

[Effects of the Invention] As described above, according to the present invention, mold clamping of the respective molds,
The first to third stations for injecting the resin liquid and waiting for the curing of the resin liquid are configured to be movable by the conveying means, and the resin liquid of the other molds is injected during the curing time of one mold to perform the molding. In a synthetic resin molding device that streamlines the process, especially when the mold is opened in the first station, the postures of the upper mold and the lower mold are changed to different directions via the support shaft to improve the workability of the operator. Efficiently removes or mounts parts and improves overall work efficiency.

Also, at the first station, the upper mold and the lower mold are reversed,
Moreover, since the reversing direction is configured to be the opposite direction, the work such as mounting the parts on the upper mold and the lower mold and taking out the molded product can be simultaneously performed by the work shared by the two workers. Since various other tasks can be performed in a comfortable posture, there is an advantage that workability is good and efficiency is high.

Although the present invention has been described with reference to the preferred embodiment, the present invention is not limited to this embodiment,
It goes without saying that various improvements and design changes can be made without departing from the scope of the present invention.

[Brief description of drawings]

FIG. 1 is a plan view showing an arrangement relationship of stations forming a synthetic resin molding apparatus according to the present invention, and FIG. 2 is a first view constituting a synthetic resin molding apparatus according to the present invention.
A side view of the station and the second station, and FIG. 3 is a second side view of the synthetic resin molding apparatus according to the present invention.
A side view of the station and the third station, and FIG. 4 is a fourth view of the synthetic resin molding apparatus according to the present invention.
FIG. 5 is a side view of the station and the first station, in which the mold is in a clamped state, and FIG. 5 is a side view showing a condition when the mold is opened in FIG. 10 …… Synthetic resin molding machine 12, 14, 16, 18 …… Station 20 …… Molding die, 25 …… Reversing table 26a, 26b …… Spindle, 27 …… Reversing cylinder 28 …… Truck, 32 …… Traveling cylinder 40 …… Pressing device, 44 …… Fixing plate 46 …… Ram, 48a, 48b …… Hydraulic cylinder 52 …… Holding frame, 56 …… Pinion gear 58 …… Rack member, 72 …… Pump unit 84 …… Traction dolly, 96 …… Traveling motor 98 …… Pinion, 100 …… Rack 110 …… Roller conveyor

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-54-146874 (JP, A) JP-A-57-72832 (JP, A) JP-A-63-212519 JP, A)

Claims (6)

[Claims] 1. A first station having a mechanism for clamping an upper mold and a lower mold for a mold, and a second station having a mechanism for injecting a resin liquid into the mold that has been clamped. And a third station that waits for the injected resin liquid to cure, and these first to third stations are connected in a loop through a conveying means, and the molding is performed between the respective stations. In a synthetic resin molding apparatus in which a mold is movably arranged, an upper mold and a lower mold that compose the first station are held by a support shaft, and are rotatable in different directions when the mold is opened via the support shaft. 1. A synthetic resin molding device, characterized in that 2. The synthetic resin molding apparatus according to claim 1, wherein the lower die is placed on a reversing table, and the reversing table is rotatably supported by a support shaft. 3. The synthetic resin molding apparatus according to claim 1, wherein the upper die is held by a holding frame, and the holding frame is rotatably supported by a support shaft. 4. The apparatus according to claim 3, wherein a rack connected to a drive source provided on the ram is meshed with a pinion gear attached to a support shaft of the holding frame, and the rack is linearly displaced by the drive source. A synthetic resin molding device characterized in that an upper mold integrated with a holding frame is rotated by a predetermined angle. 5. The synthetic resin molding apparatus according to claim 3 or 4, wherein the holding frame is configured to rotate at least 90 ° or more with respect to a horizontal plane. 6. The apparatus according to claim 2, wherein a lower die is placed on the reversing table via a carriage that conveys the forming die to the second station, and the reversing table is placed on a horizontal plane under the driving action of the cylinder. The synthetic resin molding device is characterized in that it is rotatable at least 30 ° or more.