JPH06238681A - Production releasing device for expansion molding die - Google Patents

Abstract

(57) [Summary] [Purpose] Automatically removes the foamed product from the mold without manual work by the operator. In a foam molding die including an upper die 12 and a lower die 11, and sometimes a core die, at least one of the upper die and the core die can project from a back surface side of the die to a molding surface side. At least one protruding pin 14, 17, 2
0 and 22 are provided, and the projecting pins are attached to the drive cylinder 15,
18, 21 and 23, each drive cylinder is connected to a pressure accumulating means via a directional switching valve, said directional switching valve being connected to a switching means for effecting its shift operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for releasing a product of a foam molding die, and more particularly, to a foam molding product as a product from a mold in an opened state by manual work by an operator. If it is possible to remove it automatically, it will be done.

[0002]

2. Description of the Related Art As a conventional general foaming mold, there is a mold illustrated in FIG. This is a foaming mold for molding a urethane foam seat back cushion of a passenger car separate seat. In the figure, 1 is a lower mold and 2 is an upper mold hinged to one side of the lower mold 1. 3 is a core mold which is hinged on the molding surface side of the upper mold 2 so as to be pivotable within a certain angle range.

When the seat back cushion is foam-molded by using such a molding die, the seat back cushion S as a product, as shown in the figure, has the core die 3 placed on the upper, lower, left and right sides thereof. Since the seat back cushion S is to be demolded from the direction, conventionally, when the seat back cushion S is released from the mold, the seat back cushion S is first manually opened by a worker under a mold open state as shown in FIG. The lower end tongue S1 of the back cushion S is peeled off from the core mold 3 as shown by the arrow in the figure, and then both side portions S2 of the seat back cushion S are also shown in the figure as shown in FIG. The seat back cushion S is peeled off from the core mold 3 as indicated by the arrow, and while maintaining this state.
It was common to lift the whole of the above in the upper direction of the core mold 3 and peel off the upper end portion of the seat back cushion S from the core mold 3.

[0004]

As described above, in the conventional foaming mold, the demolding of the foamed product requires the manual work of the operator, which significantly increases the man-hours. In addition, when the molded product is a urethane foam product as shown in the figure, the urethane foam is liable to tear during the demolding work immediately after the reaction, and the product is left, right, up and down as shown in the drawing. If the product has a bag-like shape that holds the core mold in a certain direction, it is more difficult to properly remove the product from the mold, and there are many factors that require skill in the work. There was also a problem. Furthermore, since this demolding work is performed in a work posture of a middle waist under a heated state of the mold, there is a problem that both working environment and conditions are bad.

The present invention has been made as a result of investigations aimed at solving such problems of conventional foam molding dies, and an object of the present invention is to remove a mold of a foam molded product by a work. (EN) Provided is an apparatus for removing a product of a foaming mold, which can be automatically performed without manual work of a person.

[0006]

According to another aspect of the present invention, there is provided a device for removing a product from a foaming mold, wherein at least one of the upper mold and the core mold is capable of projecting from the rear surface side of the mold toward the molding surface side. Providing a protruding pin of the book, the protruding pin,
A switching means which is connected to a return type drive cylinder, which drive cylinder is connected via a directional control valve to a pressure accumulating means, also for example an air tank, and each directional control valve causing its shift operation. Connected to.

Preferably, the directional control valve is a pilot operated switching valve, and the switching means is
Connected to the same or other accumulators as described above,
It consists of a mechanical switching valve that controls the supply and discharge of pilot pressure to the pilot operation switching valve.

[0008]

[Operation] With this product demolding device, after foam molding,
For example, when the mold opening operation of the molding die is completed, the mechanical switching valve as the switching means is operated to shift the pilot operation switching valve, so that the projecting pin is moved to the upper die and the core based on the action of the drive cylinder. It is possible to project at least one molding surface side of the mould, whereby the projecting pin, with its tip surface having a sufficient width, allows the molded product to be removed from the molding surface of the mould without fear of breaking it. Can always be peeled off properly.

Therefore, in this case, the required number of projecting pins corresponding to the shape and size of the foamed molded product are projected in the required order, so that the molded product requires manual work by the operator. Without the need for automatic demolding.

It should be noted that, here, the projecting operation of the plurality of projecting pins at the same time can be performed based on the operation of the respective drive cylinders corresponding to the projecting pins, as a matter of course, by operating only one drive cylinder. Can also be done.

By the way, in this demolding device, the directional switching valve is constituted by a pilot operation switching valve, and the switching means is connected to a pressure accumulating means to supply and discharge pilot pressure to the pilot operation switching valve. When the mechanical switching valve that controls the system is used, the entire system can be configured with pneumatic components, which improves heat resistance compared to the electrical system, simplifies the structure, and reduces equipment costs. It can be inexpensive.

Further, when the pressure accumulating means is attached to the foaming mold itself, routing of the pressure supply pipe line to the foaming mold which may pass through a heating furnace or the like is completely eliminated. It is also possible, at a specific point in the moving path of the foam mold, each directional control valve,
It is not necessary to install special pressure supply equipment for the operation of the drive cylinder or the like.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic line sectional view showing an embodiment of the present invention, and this foaming mold is also for molding a seat back cushion similar to that described in the conventional example.

This forming die comprises a lower die 11 and an upper die 12 having one side hinged thereto. The upper die 12 here is not only the original upper die portion 12a but also the conventional die. It also has a core-corresponding portion 12b corresponding to the core type described above.

Here, in the open position of the upper die 12 as shown in the drawing, the lower end of the core-corresponding portion 12b is
Under the guide of the sleeve 13 which is provided so as to project to the back surface side thereof, a projecting pin 14 which can project to the molding surface side of the core-corresponding portion 12b is arranged, and the projecting pin 14 is provided.
Is connected to a drive cylinder 15 attached to the upper die 12, and under the guidance of a sleeve 16 provided at the upper end of the core-corresponding portion 12b, which also projects toward the back side thereof,
Projecting pin 17 that can project from the back surface side to the molding surface side
And the rear end of its protruding pin 17 is connected to another drive cylinder 18, which is also mounted on the upper mold 12. Here, the length of the sleeves 13 and 16 is
It is preferable to select in proportion to the required length of the projecting pins 14 and 17 so that the smoothness of the projecting pins 14 and 17 guides the forward / backward movement.

Further, the original upper die portion 12 of the upper die 12
A projecting pin 20 guided by a sleeve 19 provided therein is provided in a, and the projecting pin 20 is connected to the drive cylinder 2
1, the pin 20 of which is also connected to the upper mold part 12a.
If it is possible to project from the back side of the to the molding surface side of it.

By the way, in the sectional view shown in FIG. 1, only three projecting pins 14, 17, 20 are shown, but the core-corresponding portion 12b should be embraced in the vertical and horizontal directions. In the case of molding the seat back cushion S having a different shape, it is preferable that the seat back cushion S is shown in a schematic diagram corresponding to its rear perspective view shown in FIG.
Two protruding pins 14 and 17 are provided, and one or two protruding pins 22 that are operated to move back and forth in the left-right direction in the drawing are provided. Here, as shown in FIG. 3, each protruding pin 22 is connected to the drive cylinder 23 in the same manner as other protruding pins.

FIG. 3 is a diagram exemplifying the operation circuits of the above-mentioned respective drive cylinders. Here, each of the drive cylinders 15, 18, and 21 is provided with a respective pilot operation switching valve P _1, P ₂ , P. ₃ is connected to an air tank T as an example of pressure accumulating means, and each of the pilot operation switching valves P _1, P ₂ and P ₃ is a mechanical switching valve M that controls the supply and discharge of pilot pressure to and from them. And the mechanical switching valve M is also connected to the air tank T via another pilot operation switching valve P ₄ .

Further, here, the respective protruding pins 14,
Corresponding to each of the 17 reverse limit positions and advance limit positions
Let's make each limiter parb L₁~ L_FourIs provided
These limiter valves L₁~ L_FourDepending on
This pilot operation switching valve P ₁~ P_FourSwitching timing
Controllable.

Further, here, the mechanical switching valve M is
It is also connected to a pilot operation switching valve P ₅ common to the two drive cylinders 23, and this pilot operation switching valve P ₅ is also connected to a limiter valve L ₅ provided corresponding to the advance limit position of the projecting pin 20. . Incidentally, reference numeral 24 in the drawing denotes an air timer which is arranged between the drive cylinder 21 and the pilot operation switching valve P ₃ and controls the advance timing of the projecting pin 20.

According to the operation circuit configured as described above, for example, the mechanical switching valve M is shifted from the position shown in the drawing in synchronism with the opening and closing of the upper and lower dies, so that the pressurized air in the air tank T is first urged. Is supplied to each of the pilot operation switching valves P _{1 and} P ₅ via the pilot operation switching valve P ₄ and the limiter valve L ₂ , whereby the projecting pins 14 and 22 are both advanced.

As a result, as shown in FIG. 4A, the lower tongue portion S ₁ of the seat back cushion S, which holds the core-corresponding portion 12b of the upper mold 12 from the lower side thereof,
The core-corresponding portion 12b is automatically and properly peeled off without fear of tearing, and the left and right side portions S ₂ (see FIG. 2) of the seat back cushion S are
The core-corresponding portion 12b is properly peeled off as if it were as shown in FIG.

When the protruding pin 14 reaches its advance limit position and the limiter valve L ₃ is shifted from the position shown, the pilot operation switching valve P ₄ is also shifted from the position shown, and the air tank T is pressurized. Air is supplied to the rod side chamber of the drive cylinder 15, and the protruding pin 14
Is retracted.

Next, when the projecting pin 14 reaches the retracted limit position and the limiter valve L ₁ is shifted to the position shown in the drawing again, the pressurized air in the air tank causes the switching valve P ₄ and its limiter valve L ₁ to move. Is then supplied to the pilot operated switching valves P ₂ and P ₃ , and both switching valves P ₂ and P ₃ are supplied.
Shift _2, P ₃ . As a result, the protruding pin 1
7 is immediately actuated, while the ejector pin 20 is actuated under the action of the air timer 24 after a certain time delay.

FIG. 4B shows the protruding state of the protruding pin 17.
It is a figure showing, and in this state, a seat back cushion
S is the upper end S of the protruding pin 22 when it is advanced.₃in
It is peeled off from the child equivalent part 12b,
The cushion S has an upper end S ₃And the core equivalent part 12b
Can be lifted to a position where it does not interfere.

On the other hand, in the projecting pin 20, the projecting pin 17 actuates the limiter valve L ₄ at its advance limit position, whereby the pilot operation switching valves P ₄ and P ₂ are sequentially shifted, and the projecting pin 20 projects. When the pin 17 is retracted, the pin 17 is advanced at the same timing. As a result, as shown in FIG. 4C, the seat back cushion S is separated from the core-corresponding portion 12b.

After the one seat back cushion S has been demolded as described above, each pilot is actuated based on the action of the limiter valve L ₅ which is actuated when the projecting pin 20 reaches the advance limit position. Operation switching valve P _3, P ₅
Are shifted to return each of the ejector pins 20 and 22 to the retracted limit position, which completes one operating cycle of each ejector pin.

Thus, according to this apparatus, the foam molded article, for example, the seat back cushion, can be automatically removed from the foam molding die without fear of damaging it.

In the present invention, it is needless to say that the disposition position of the projecting pins, the number of the projecting pins, and the operating order thereof can be appropriately determined according to the size and shape of the foam-molded product.

[0030]

As is apparent from the above description,
According to the present invention, in particular, at least one of the upper mold and the core mold is provided with at least one projecting pin driven by a cylinder, so that the foam molded article can be released from the mold by an operator. It can be performed quickly and automatically without requiring any work and without fear of damage to the foam-molded article.

[Brief description of drawings]

FIG. 1 is a schematic line sectional view showing an embodiment of the present invention.

FIG. 2 is a diagram showing a relative relationship between a seat back cushion and a protruding pin.

FIG. 3 is a diagram illustrating an operating circuit of a protruding pin.

FIG. 4 is a schematic cross-sectional view showing the action of a protruding pin.

FIG. 5 is a diagram showing a conventional example.

FIG. 6 is a diagram illustrating a conventional demolding process.

[Explanation of symbols]

11 lower mold 12 upper mold 12a upper mold portion 12b tang corresponding parts 13,16,19 sleeve 14,17,20,22 ejector pins 15,18,21,23 drive cylinder P ₁ to P ₅ pilot operation switching valve M Mechanical Valve T Air tank L _{1 to} L ₅ Limiter valve S Seat back cushion

Claims (2)

[Claims] 1. A foam molding die comprising an upper die and a lower die, and sometimes a core die, wherein at least one of the upper die and the core die is capable of projecting from a back surface side of the die to a molding surface side. At least one protruding pin is provided, the protruding pin is connected to a drive cylinder, and this drive cylinder is connected to a pressure accumulating means via a directional switching valve, and the directional switching valve causes its shift operation. A device for removing a product of a foaming mold which is connected to a switching means. 2. The mechanical switching valve, wherein the directional switching valve is a pilot operation switching valve, and the switching means is connected to a pressure accumulating means to control the supply and discharge of pilot pressure to and from the pilot operation switching valve. The product demolding device for a foam molding die according to claim 1, which is configured.