JP3136092B2 - Mold for variable size molding of plastic concrete casting formwork made of glass fiber composite material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding a plastic formwork (hereinafter referred to as a plastic control panel) used for concrete casting for building construction or civil engineering construction. More specifically, the mold is filled with a thermoplastic synthetic resin using glass fiber as a composite material,
Also, the present invention relates to a molding die for a plastic control panel using a glass fiber as a composite material in which the dimensions of a long direction (X-axis) frame can be variously changed.

[0002]

2. Description of the Related Art Conventionally, a concrete casting form (concrete panel) used for building construction or civil engineering construction has been mainly made of wood. And
As the concrete panel, there is used one obtained by sawing raw wood into a thick plate and assembling it, or one obtained by processing veneer as a thick plate and assembling it.

However, wooden ones deteriorate due to repetition of expansion and contraction due to water absorption and drying at the time of placing concrete, and have a useful life of 7 to 8 times.

Further, when the concrete panel is disassembled after the concrete is solidified, the wooden concrete panel is not easily separated from the concrete, and the concrete surface or debris may adhere to the wooden concrete panel. Was.

[0005] Therefore, at the time of re-use, it is necessary to remove concrete pieces adhering with a metal spatula or the like. Further, in order to improve the peeling of the concrete panel from the concrete, an oil is applied to the surface of the concrete panel. It was necessary to perform an operation such as applying an adhesive.

Further, as described above, since the service life of wooden concrete panels is short-lived, concrete panels are produced in large quantities, and the amount of wood used for the panels is enormous. The volume is constantly expanding. As a result, the jungle is desertified in Japan, as is the case with people all over the world.

Under such circumstances, with the guidance of the government, the conversion of concrete panels to resin has been promoted, and manufacturers have begun development by repeating trial and error. The current situation is that it is increasing.

[0008] When concrete is poured into a formwork, such as a building or civil engineering construction, to which the produced plastic control panels are connected, heat of hydration is generated due to the hydration reaction of cement, and the formwork is heated to 60 ° C. Reaches even more. As a result, the plastic control panel is softened by the influence of the influence and thermal expansion occurs, so that the mold is bent.

Further, since a large lateral pressure of the concrete is applied to the plastic control panel, its deflection is transferred to the solidified concrete surface, and irregularities due to the deflection are generated on the concrete surface.

In order to prevent the occurrence of irregular irregularities on the concrete surface, calcium carbonate powder is used as a composite material in PP (polypropylene) resin, or the thickness of the resin is increased. However, for this reason, the weight of the plastic control panel itself becomes too heavy and the rigidity increases, but the impact resistance is reduced on the contrary, and no satisfactory results are obtained.

From these trials and errors, in order to obtain a lightweight plastic control panel that satisfies mechanical strength and thermal strength, it can be realized by using glass fiber as a composite material with PP resin. The result of the experiment became clear.

It has been found that by using glass fiber as a composite material, it is possible to obtain a light weight plastic control panel which satisfies mechanical strength and thermal strength, but the price is lower than that of a wooden concrete panel. It is expensive.

However, the plastic control panel can withstand several tens of uses, which is incomparable with a wooden concrete panel in terms of the number of service life. Also, not only that,
After the concrete is cast and the concrete is solidified, it can be easily peeled off and dismantled from the concrete, and unlike the wooden concrete panel, the concrete surface and debris do not adhere to the plastic control panel.

[0014] With this, when the plastic control panel is reused, there is no need to remove the concrete pieces from the plastic control panel since the concrete pieces do not adhere to the surface. is there.

[0015] Since it can withstand several tens of uses and there is no need to remove concrete pieces, ten or more plastic control panels are connected as one large frame, and this large frame is used for building 1 Carry out concrete work for floors. Next, taking advantage of the good removability of the plastic control panel, this large frame is peeled off from the solidified concrete surface without being dismantled, pulled up to the floor with a crane, and used one after another as a concrete placing frame on the floor. By repeating these operations, there is an advantage that the labor cost required for building a high-rise building can be significantly reduced.

Furthermore, since the surface of the plastic control panel is directly transferred to the concrete surface, if the surface is finished as a mirror surface of glass, the surface of the concrete wall which has been cast and solidified is like a mirror surface of glass. No finishing work is required.

If a decorative material such as a wallpaper or cloth can be directly covered or painted without performing the overpainting as described above, the construction cost can be further reduced.

However, even sink marks formed on the surface of the plastic control panel during molding are transferred to the concrete. Therefore, even if the finished wall is covered with wallpaper or painted, depending on the viewing angle, the sink mark of the plastic control panel transferred to the concrete looks more exaggerated by the action of light. Therefore, there is a demand for a molded product in which a sink mark does not appear on the surface of the plastic control panel.

The sink mark appearing on the surface of the plastic control panel becomes difficult to be formed if the rib structure forming the plastic control panel is made as thin as possible. Therefore, the structure of the plastic control panel can be maintained even if the rib structure is made thin. Can be solved.

Further, what is more troublesome than the sink mark on the surface of the plastic control panel is that there is a lot of water leakage from the connecting portion of the plastic control panels at the time of placing concrete. If there is a lot of water leakage at this part, the connection part of the plastic control panels becomes a rough sandy surface, which is more ugly than the sink mark. Therefore, how to minimize water leakage from these connecting parts has been a major problem.

In order to solve this water leakage, the outer frame forming the four sides of the plastic control panel having a frame height of about 70 mm has conventionally been connected in a butt shape over the entire surface of about 70 mm. With a butt-shaped connection over the entire surface, it is difficult to obtain a highly accurate connecting portion. For this reason, a small area close to the surface of the plastic control panel provides a highly accurate butting shape, so that there is no gap, so that the outer surface of the four-sided frame of the plastic control panel has a thickness of 1 mm and a width that is continuous with the plastic control panel surface. A belt-like projection of 10 to 12 mm is formed.

By connecting the plastic control panels with a special connection fitting (not shown), only the series of band-shaped projections serve as a high-precision mating surface, and water leakage from these connection portions is minimized. Can be stopped.

Further, the purpose of use of the building is condominium,
The heights of concrete walls formed by plastic control panels vary widely, such as shops, offices, hotels, and the like. However, the size of a wooden concrete panel used in a conventional concrete casting formwork is 600 mm.
Standard dimensions of mm × 1,800 mm are determined. For this reason, a mold having a standard size has been cut with a saw in accordance with the height of the indoor wall, and the cut product has been used or added to a standard size.

Also, plasticized plastic control panels were cut with an electric saw and used in the same manner as wooden panels.

In such a method of using the formwork, the effort for eliminating the sink mark and preventing water leakage from the panel combination part (eliminating the sand-like roughness on the concrete surface) becomes completely meaningless.

Therefore, a non-standard-sized plastic control panel to be added to the standard-sized plastic control panel is, similarly to the standard product, equivalent to a standard product having the same band-like projections forming a continuous surface with the surface of the plastic control panel on the outer surface of the four-sided frame. Good quality is desired. And a convenient thing is desired as a concrete panel.

In a meeting with a user's contractor, the length in the short Y-axis direction is 600 mm, and the length in the long X-axis direction is 900 mm, from the minimum dimension of 600 mm.
1,200,1,500,1,800, the maximum size of 2,
Six types of 100 mm are required.

In order to mold these six types of plastic control panels, usually six molds are required.

Among them, the die having a size of 1,800 mm is a conventional standard size, so that a maker can sufficiently amortize the die manufacturing cost. However, the molds of the remaining five dimensions have no compensation for the product purchase of each user,
There is no prospect of amortization of mold manufacturing costs.

However, in order to increase the sales of the plastic control panel, and thus to promote the growth of the plastic control panel industry, it is not possible to leave it as it is, and to make the mold production under the burden of the plastic control panel manufacturer. Has to be done.

[0031]

The use of glass fiber as a composite material to form a large-sized resin molded article is a challenge. This is because there is a limit in the flow length of the resin when the molten thermoplastic synthetic resin is injected by the injection molding method. So, like a plastic control panel, 600mm ×
It has a large area such as 1,800 mm, 4 to 5 mm
In order to form a product having a thickness, a multipoint gate having a pin point is necessary, and molding is impossible unless a mold structure having gates from 6 to 8 locations is used.

When a resin is formed using a glass fiber as a composite material using such a pinpoint gate, there is a problem that if the molding is continued for one week, the gate diameter becomes large due to the abrasion of the gate. . Therefore, when the molded product is released from the mold, the gate cannot be cut, the gate tip peels off, or cracks occur on the gate tip surface, and a molded product that can be used cannot be obtained. there were.

Since injection molding using glass fiber as a composite material is impossible as described above, the only other molding method is press molding or injection compression molding, but all of these require a press mold structure. It is essential.

In order to obtain a beautiful surface of the plastic control panel according to the user's needs by these methods, it is necessary to prevent water leakage from the connecting portions of the plastic control panels. For this purpose, it is necessary to provide a band-shaped projection on the outer surface of the four-sided frame of the plastic control panel so as to be continuous with the surface of the plastic control panel. As a result, there is a disadvantage that the molded product cannot be released.

These will be described with reference to the drawings. Conventionally, there is a structure shown in FIGS. 1 and 2 in a mold structure used for a normal press molding die. In the case of FIG. 1, vertical burrs are generated in a fitting portion 90 between the upper mold 9 and the lower mold 10. It is difficult to perform the finishing operation without leaving traces of the burr finish on the vertical burr, and it is impossible to adopt this mold structure.

Further, in order to prevent water leakage from the connecting portion between the plastic control panels, belt-like projections 91 are formed on the four sides of the outer frame continuous with the surface of the plastic control panel, as shown in FIG. Vertical burrs are generated on the upper surface of the panel. Therefore, it is extremely difficult to perform a finishing operation so as not to leave traces of this mold structure and burr finish, and it is impossible to adopt this mold structure.

When this is replaced with the mold structure shown in FIG. 2, vertical burrs are generated in the fitting portion 93. However, since the vertical burrs are on the rear side of the plastic control panel, the vertical burrs can be finished. There is no problem even if something goes wrong. However, when the band-shaped projection 91 is formed on the outer surface of the four-sided frame continuous with the surface of the plastic control panel, the corner of the upper mold 9 for forming the band-shaped projection 91 has an undercut shape, and the product cannot be released. Therefore, it is impossible to adopt the mold structure shown in FIG.

FIG. 4 shows a mold structure used for ordinary injection molding, which is used for injection compression molding.
Since the upper mold 94 floats at the time of injection from the lower mold 101, the molten resin at that time is injected into the parting line 9 of the mold.
There is a risk of spillage from 5. In addition, it is impossible to suppress the resin outflow due to the flow velocity at the time of pressurization, and it is impossible to eliminate the sink mark due to the loss of pressurization pressure, so it is impossible to adopt this mold structure. .

Further, as shown in FIG. 4, it is impossible to use the mold structure shown in FIG. 4 for injection molding because glass fiber cannot be used as a composite material.

Further, when the parting line 95 in FIG. 4 is replaced with a parting shape line 951 indicated by a dotted line, the outflow of the molten resin from the parting line 951 can be prevented, and the part can be used as a mold for injection compression molding. However, since the thickness of the band-shaped projection 91 is about 1 mm, the thickness of this portion of the lower mold becomes 1 mm, and the strength is insufficient, so that it is impossible to adopt such a mold structure.

In order not to leave any trace of the mold on the surface of the plastic control panel, which is one of the objects of the present invention, the present invention uses a nozzle port through a direct gate from a point on the back side of the plastic control panel. This is to supply a molten thermoplastic synthetic resin.

As described above, this supply cannot be realized by conventional injection molding or injection compression molding. Thus, the nineteenth patent of the inventor of the present invention is
No. 31933 (Japanese Patent Publication No. 6-51331). The upper and lower parts of the present invention in which a molten thermoplastic synthetic resin from a large-capacity injection molding mechanism using an extruder is mounted on a mold clamping mechanism of Japanese Patent Application No. 7-253281. It is supplied to the cavity space of a closed mold composed of a mold to form a plastic control panel.

The reason for choosing these is that the plastic control panel is supplied from one injection port on the back side to the cavity space of the closed mold composed of the upper and lower molds and is filled with the high pressure of the usual injection molding machine. This is because it is impossible to flow. This flow is impossible because even if the molten thermoplastic synthetic resin is injected with an ultra-high injection pressure, cooling of the thermoplastic synthetic resin starts due to heat exchange with the mold at the same time as the injection, increasing the viscosity. This is because the flow length is limited because of the large resistance.

Further, at the time of being supplied from the gate to the cavity space of the closed mold constituted by the upper and lower molds,
This is probably because the resin spreads and the injection pressure is dispersed.

To reduce the flow resistance of the resin, there are means such as keeping the mold temperature high or increasing the thickness of the product so as not to cool the molten resin. There is no means. Moreover, even if the product has a large area and requires strength, such as a plastic control panel,
At the maximum thickness of the plastic control panel, the wall thickness is less than 5 mm. Increasing the product thickness causes the occurrence of sync marks,
The weight of the plastic control panel increases, which is against the demand for weight reduction.

The method of forming the plastic control panel, which has these various difficulties, and is economical depends on how much the flow resistance of the molten resin is reduced.

Then, as described above, the upper and lower dies according to the present invention are mounted on the vertical clamping mechanism of the descending mold by the large-capacity injection molding mechanism using the extruder. Then, the nozzle is brought to the center of the upper surface of the lower mold in the upper and lower molds installed, and the measured molten resin is injected into the upper surface of the lower mold in a mountain shape. Let
A mold clamping pressure is applied between the upper and lower molds.

In this large-capacity injection molding mechanism, a forklift pallet having an area larger than the area of the plastic control panel can be formed with a mold clamping force of about 1/10 of that of the injection molding machine. Molding is possible with a molding cycle that is not inferior.

This is because, among the mountain-shaped molten resin injected onto the upper surface of the lower mold, the lower mold that is cooled to increase the molding cycle in order to maintain economy is affected by the thermal effect of the lower mold. Is only its bottom. Therefore, when the upper mold descends and is subjected to mold clamping pressure, the flow of the molten resin in a mountain shape is performed. At this time, the circular outer circumference on the bottom surface of the mountain shape is entirely a film gate (flash gate). Serve the role of. And the flow speed is a high speed that is incomparable with the flow speed of conventional injection molding, the thermal effect on the mold during the flow is reduced, and the molten resin can be applied to thin parts that cannot be injection-molded. This is because filling becomes possible.

However, the molding method of injecting the molten resin in the shape of a mountain at the center of the upper surface of the lower mold does not apply to molded products such as pallets for forklifts, which do not require the surface appearance of the molded products. It is suitable.

However, in the case of a molded article such as a plastic control panel that requires the same aesthetic appearance as an injection molded article, a molding method of injecting a molten resin into the center of the upper surface of the lower mold in a mountain shape is appropriate. There is a disadvantage that it is not.

When the nozzle is brought to the center of the upper surface of the lower mold and the molten resin is injected, the molten resin from the nozzle is supplied in a spiral shape like a snake with a coil. Therefore, the air adhering around the molten resin supplied with the nozzle thickness is clamped and compressed together with the molten resin. When the molten resin flows, the air compressed and clamped together with the molten resin is entrained between the molten resins, and when solidified, a silver mark is formed on the surface of the resin (the air entering the resin is stretched and the surface is stretched). This is due to the appearance of silver linear traces on the surface.

Since this large-capacity injection molding mechanism is a large-sized molding machine, the nozzle port is brought to the center of the upper surface of the lower mold, and the operation of inserting and removing the nozzle port from the center is performed. The time is long, during which time the mold closes and pressurizing operation is not possible. For this reason, the surface temperature of the injected mountain-shaped molten resin decreases, and the temperature difference between the center and the surface that has flowed due to the pressure appears as a difference during mold transfer, and the difference appears as a pattern. There are characteristics that should be said.

In general, in order to mold a molded article having not only this property but also a perfect appearance to the thermoplastic synthetic resin, the surfaces constituting the mold cavity (for example, the lower surface of the upper mold and the upper surface of the lower mold) are formed. On both sides of (1), there is a characteristic that molding cannot be performed unless fluidized while contacting.

Therefore, the operation time for inserting and removing the nozzle port from the center between the upper and lower molds due to the large size of the apparatus itself becomes a problem. It is fixed to the lower part of the center.

However, in the structure in which the nozzle is fixed to the mold, the nozzle portion needs to be heated, and the molded article needs to be cooled. There is a problem that it is required, the mold structure becomes complicated, and the production cost becomes high.

However, this problem has a great merit that a molded article which cannot be molded by a conventional injection molding machine can be molded, and a large molded article which requires more aesthetics and which has higher added value can be molded. It is insignificant by comparison.

As a molding method, a large-capacity injection mechanism using the extruder and a mold clamping mechanism provided with a special hydraulic circuit are disclosed in Japanese Patent Application No. 7-253281 (injection compression for thermoplastic resin molding). The molding machine will be described.

In general, it is common sense that even in a cooled mold, if the product thickness to be molded (the height of the cavity space of the opposed mold) is large, the flow resistance of the molten resin is small and the flow distance is long. It is. However, according to the injection compression molding machine of the present invention, the cavity space between the dies becomes large due to the floating of the upper dies only when the injection of the measured molten resin is completed by the injection pressure at the time of injection even for a thin molded product. ,
The molten resin has low flow resistance, flows even at a low injection pressure, and a predetermined amount can be injected into the cavity. At the same time as the completion of this injection, if the mold opening pressure is applied while closing the nozzle port to prevent backflow, the mold is pressed as much as the mold floats, and the molten resin that has finished flowing in the cavity is It is compressed to a predetermined size, and a molded product excellent in appearance can be obtained.

The floating of the upper molds of the closed upper and lower molds is completed when the closing of the upper and lower molds mounted on the mold clamping mechanism is completed.
The mold-clamping forward hydraulic circuit is switched to neutral, and the forward-side oil supply port of the mold-clamping cylinder is connected to the drain circuit to make it into a pressureless state. Then, by supplying the molten resin from the nozzle port to the closed cavity space between the upper and lower molds, the cavity space is expanded by injection pressure.

In this floating operation, the weight of the lower mold clamping portion and the upper die for forming the plastic control panel is about 7 to 8 tons, but the molten resin pressure supplied from the nozzle port is injected at 100 kg / cm ² . If the area is about 200 cm ² , the push-up force is calculated to be about 15 to 20 tons.

The upper die floats due to this pushing force, and further rises by the molten resin continuously injected, thereby increasing the area of the molten resin.

By using the above-mentioned molding method, when a plastic control panel is formed from a resin in which glass fibers are mixed as a composite material, the back surface of the plastic control panel comes into contact with the lower mold. Therefore, even if a nozzle port having a hole diameter of 20 to 30 mmφ is provided directly in the center of the lower surface of the lower mold,
No trace appears on the surface of the plastic control panel.

The fact that the diameter of the nozzle opening is large means that the nozzle opening is less worn by the glass fiber.
Even if there is abrasion, it does not affect the removal of the molded product, indicating that this molding method is a molding method having great merit.

This injection compression molding method is closer to press molding than injection molding, so that the mold structure naturally does not generate burrs due to press pressure, and even if burrs do occur, the finishing operation is performed. It is designed to be generated in an easy place. In addition, burrs are generated in places where there is no hindrance to the use of the molded product, regardless of whether the manual work is good or bad.

Also, in order to be able to mold a plastic control panel of six different sizes with a single mold, the lower mold is the back surface of the plastic control panel. It is permissible to perform the replacement work and assemble, and the line of the connecting portion of each block appears.

However, the upper mold cavity plate, which is the surface of the plastic control panel, is required to be free from any mold processing marks like a mirror surface of glass. For that purpose, the upper mold cannot be divided into each block like the lower mold, and six types of upper mold cavity plates are required, and there is a drawback that the mold manufacturing cost is relatively high. .

In addition, the replacement of the upper mold cavity plate requires replacement of the lower mold cavity block. The dimensional tolerance of the lower mold cavity block appears as a cumulative error due to the replacement, and Position adjustment is required, and there is a problem that a long time is required for the rearrangement work.

It is an object of the present invention to provide a dimensionally variable molding die for a plastic control panel using a glass fiber as a composite material, which can form six types of plastic control panels with a single-sided die with as little expense as possible. I do.

It is another object of the present invention to provide a mold for variable-size molding of a plastic control panel using a glass fiber as a composite material that does not leave any trace of the metal mold on the surface of the plastic control panel.

That is, in order to leave no trace of the mold on the surface of the plastic control panel, a dimensionally variable molding of the plastic control panel using a glass fiber as a composite material which can be formed by a direct gate from one point on the back side of the plastic control panel. The purpose is to provide a mold.

Further, on the outer surface of the four-sided frame of the plastic control panel,
In forming band-shaped projections that are continuous with the surface of the plastic control panel, dimensional variable molding of plastic control panels made of glass fiber composite material, so that no undercut occurs at any corner of the upper mold and the lower mold. It is an object to provide a mold.

It is another object of the present invention to provide a mold for variable-size molding of a plastic control panel using glass fiber as a composite material, in which the molds can be easily changed.

[0074]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a mold for variable-size molding of a plastic concrete casting mold using glass fiber as a composite material according to the present invention is completed. At this point, the mold closing forward hydraulic circuit directional switching valve is switched to neutral to connect the forward-side oil supply port of the mold closing cylinder to the drain circuit, and the mold closing forward hydraulic circuit is brought into a non-pressure state. By supplying molten resin with glass fiber composite material in the mold,
The movable mold is retracted, and after the set amount of the molten resin has been filled in the cavity space of the mold, the mold clamping forward hydraulic circuit direction switching valve is switched to the forward side to clamp the mold at high pressure. In the mold for forming a plastic concrete casting mold using a mechanism, the upper mold on the movable side has a fixed mold structure in which the short and long dimensions are fixed. The lower mold on the side has a fixed type in the short dimension and a reconfigurable mold structure in which the dimension is variable only in the long dimension, and the outer surface of the four-sided frame in the plastic concrete casting mold to be molded. In order to form a band-shaped projection continuous with the surface of the mold, a long-direction band-shaped projection forming portion and a long-side direction corner of the upper mold and a short-side direction corner of the lower mold, respectively. The fact that the short side direction strip-shaped projections were formed And butterflies.

[0075]

[0076]

[0077]

[0078]

Further, according to the present invention, the mold for variable-size molding of a plastic concrete casting mold using a glass fiber as a composite material is a long-direction lower mold and a short-form lower mold of the fixed-side lower mold. In the lower mold frame in the dimensional direction, a shielding frame block for preventing the molten resin from flowing out at the time of injection of the molten resin into the mold and at the time of pressurization is provided by being inserted, respectively, and the elasticity of the spring, or The method is characterized in that the shielding frame block is operated in a state of being strongly adhered to the upper mold by using a fluid pressure.

[0080]

[0081]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. In the following description, for the sake of simplicity of the description, "plastic concrete casting mold using glass fiber as a composite material" is referred to as "plastic control panel". Further, "a mold for variable-size molding of a plastic concrete casting mold (placon panel) using glass fiber as a composite material" is simply referred to as "molding mold".

FIGS. 1 to 3 schematically show upper and lower molds used in conventional press molding, and FIG. 4 schematically shows upper and lower molds used in conventional injection molding. It is.

FIG. 5 is a schematic view of a plastic control panel formed by using the molding die of the present invention as viewed from the back side. 6 and 7 show the cross-sectional structures at the corners in the long direction (X-axis) and the short direction (Y-axis) of the molding die of the present invention, respectively.

FIGS. 8 and 9 show details of a nozzle provided at the center of the rear surface of the plastic control panel.

In the plastic control panel 1, the dimension in the short direction is 600 mm and the dimension in the long direction is 1,800 mm, but here, the dimension in the long direction can be up to 2,100 mm according to the user's needs. It is. In the plastic control panel 1, the thickness of only the four-sided frames 11, 11, 12, and 12 constituting the short and long dimension side walls is increased. In the long direction, ribs 14 slightly thinner than the thickness of the side wall are arranged at regular intervals, and in the short direction, ribs 13 which are thinner than the long ribs 14 are arranged at regular intervals. I'm making it.

According to the user's request, the dimension in the longitudinal direction is 600, 900, 1, 200, 1, 500,
1,800, 2,100mm and 300mm increments,
The longitudinal dimension of 2,100mm is divided into 14 equal parts and 150mm ×
One block is 600 mm. Then, the four-sided frames 11, 1 constituting the short and long side walls of the plastic control panel 1
The cavity spaces 2 for forming the ribs 13, 14 provided at regular intervals in the short and long directions in the short and long directions are all formed in the cavity block 31 of the lower mold 3.

The cavity block 31 of the lower mold 3
In order to equip the lower surface of the center part with the nozzle port 5, a 300 mm cavity block 3C of 150 mm is always fixed to the center of the pressure receiving plate (not shown) of the lower mold 3 for center distribution.

Then, a 150 mm cavity block 3A is connected before and after the 300 mm cavity block 3C fixed to the center of the pressure receiving plate of the lower mold 3. As a result, the lower mold 3 having a longitudinal dimension of 600 mm is formed. One side wall of the cavity block 3A forms a rectangular frame 11 in the short direction of the plastic control panel 1, and the other side wall forms a rib 14 of the plastic control panel 1.

Also, when molding the plastic control panel 1 of any size, the 300 mm cavity block 3 is required.
C is mounted on the pressure receiving plate of the lower mold 3 with a 150 mm cavity block 3B constituting ribs 13 and 14 in the short and long directions between C and the 150 mm cavity block 3A.

The fixing and connection are performed by using the form and form of the resin pallet for compression molding and the method of fixing and connecting the variable-size mold structure disclosed in Japanese Patent Application No. 7-146529 of the present inventor. It is.

As shown in FIG. 6, on both sides (long side) of the upper mold cavity plate 41 in the short dimension direction of the upper mold 4, a long dimension upper mold frame 42 having the same length as the cavity plate 41. Are fixed with bolts 43. Then, on the lower inner surface of the long-side upper mold frame 42 on both sides, a long-direction band-shaped protrusion forming portion 44 projecting inward from the end of the upper mold cavity plate 41 side is formed. Then, the lower surface of the long dimension upper mold frame 42 is inserted into the projecting portion 331 formed inside the upper end of the long dimension lower mold frame 33 and the projecting portion is inserted into the long direction lower mold frame 33. 331 and the shielding frame block 6 protruding up and down freely.

As shown in FIG. 7, on both sides (short sides) of the upper mold cavity plate 41 in the longitudinal direction, the short band-shaped protrusions having the same height as the long band-shaped protrusion forming portions 44 are formed. The shielding frame block 6 having the molded portion 45 is formed to have a length equal to the width of the plastic control panel 1 in the short direction, and is fitted into a groove 321 formed above the lower mold frame 32 in the short direction. It is brought into contact with the lower surface of the mold cavity plate 41. The short direction band-shaped projection forming portion 45 is integrally formed on the upper surface of the shielding frame block 6 on the short direction lower mold frame 32 side.

Then, these elongated direction band-shaped projection forming portions 4 are formed.
As shown in FIGS. 6 and 7, the inner surfaces of the lower mold 4 and the shorter-direction band-shaped protrusion forming portion 45 are respectively connected to the lower direction mold 33 and the shorter direction lower mold 32 by the lower mold 3. Retreat about 1mm outward from the inner surface. In this manner, when the molten resin is supplied and molded, the long-direction band-shaped projections 46 and the short-direction band-shaped projections 34 that are continuous with the surface of the plastic control panel 1 are formed.

The shielding frame block 6 is formed to have the same length as the short-direction lower mold frame 32 and the long-direction lower mold frame 33, and is supplied from the nozzle port 5 in close contact with the upper mold 4. Prevents molten resin from flowing out.

A projecting portion 61 as a stopper is formed on the upper inside of the shielding frame block 6, and the shielding frame block 6 has a hook shape.

As shown in FIG. 6, a protruding portion 331 is formed on the inner side of the upper end of the lower mold frame 33 in the longitudinal direction of the lower mold 3, and a hook-shaped portion is formed at the center of the lower mold frame 33 in the longitudinal direction. Is provided with a fitting groove 332 into which the shielding frame block 6 is vertically movable. The shielding frame blocks 6 are inserted into the fitting grooves 332, and ten or more strong compression coil springs 7 are interposed at equal intervals between the bottom surface 333 of each fitting groove 332 and the bottom surface 62 of the shielding frame block 6. Let it.

Furthermore, bolts 335 are inserted into dozens of bolt holes 334 provided from the lower end surface of the lower mold frame 33 in the longitudinal direction to the bottom surface 333 of the fitting groove 332.
Pass the compression coil spring 7 through the end of the
Screw holes 6 drilled on the lower surface of the shielding frame block 6
Screw into 3.

Then, the shielding frame block 6 is pushed up by the elasticity of the compression coil spring 7 from the longitudinal lower mold frame 33,
The upper surface of the shielding frame block 6 is pressed against the lower surface of the upper mold frame 42 in the longitudinal direction of the upper mold 4. Even if the upper mold 4 floats due to the injection of the molten resin, the shielding frame block 6 floats integrally with the upper mold 4, thereby preventing the molten resin from flowing to the outside when flowing. .

Note that instead of the compression coil spring 7,
When the molten resin is supplied using a pneumatic cylinder or a hydraulic cylinder (both not shown), the fitting groove 33 is used.
The bottom surface 62 of the shielding frame block 6 may be lifted from the bottom surface 333 of the second.

The head 336 of the bolt 335 is hooked on the bolt hole 334, and serves as a stopper for preventing the shielding frame block 6 from being pulled out above the lower mold frame 33 in the longitudinal direction by the elastic force of the compression coil spring 7. work.

On the other hand, the short band-shaped projection forming portions 45 of the shielding frame blocks 6 on both sides in the long direction (short side) are also shielded so as to have the same height as the long band-shaped projection forming portions 44. It is formed integrally on the upper surface of the frame block 6. Then, on the upper surface of the short-direction lower mold frame 32, a similar insertion hole 332 for inserting the shielding frame block 6 is formed, and the shielding frame block 6 is inserted into the insertion hole 332. Like the both sides in the short side direction (long side side), it is possible to move up and down.

At this time, the upper surface of the short-direction band-shaped projection forming portion 45 is pressed in close contact with the lower surface of the upper die cavity plate 41 of the upper die 4. As a result, even if the upper mold 4 floats due to the injection of the molten resin, the short-direction band-shaped projection forming portion 45 formed integrally with the shielding frame block 6 floats integrally with the upper mold 4. This prevents the molten resin from flowing out when flowing.

For the upper mold 4, the dimension of the upper mold cavity plate 41 in the longitudinal direction is set to the maximum dimension of 2, 1
By manufacturing so as to be compatible with 00 mm, it is possible to cope with molding of all sizes without performing any assembling work on the upper mold.

[0104]

Further, since the cavity blocks are divided into the cavity blocks 3A at both ends, the cavity block 3C at the center, and the cavity block 3B at the center, the mold assembling work can be simplified and the working time can be shortened. Has the effect.

FIGS. 8 and 9 show the details of the nozzle port 5, and the nozzle 5 is inserted into the center cavity block 3C.
1 is formed, and the nozzle port 5 is opened at the tip of the nozzle 51, and is opened and closed by a valve rod 52 which can be advanced and retracted by a hydraulic cylinder (not shown). FIG. 8 shows a state in which the valve rod 52 is retracted by the hydraulic cylinder and the nozzle port 5 is opened, and the cavity formed by the upper and lower molds 4 and 3 in which the molten resin from the large-capacity injection mechanism is closed. It is supplied to the space 2.

At the time of supplying the molten resin to the cavity 2, the upper die 4 rises due to the correlation between the flow pressure and the flow resistance of the molten resin, thereby increasing the flow area of the molten resin. Then, the injection for the weighing is completed.

When receiving the filling completion signal, the valve rod 52 advances by the hydraulic cylinder, closes the nozzle port 5 and stops as shown in FIG.

When the nozzle port 5 is closed, a nozzle port closing signal is received, a mold clamping force is applied to the floating upper mold 4, and the molten resin is instantaneously filled into the cavity space 2. It cools down. During this set cooling time, the mold clamping force continues to apply pressure in order to suppress the generation of a sync mark. A beautiful plastic control panel 1 is obtained.

As described above, according to the present invention, as can be seen from the structure of the upper and lower molds, even if the belt-shaped projections are formed in a four-sided frame that is continuous with the surface of the plastic control panel, there is no problem in releasing the molded product. No problem. Also, for the upper mold floating during injection,
The shielding frame block is brought into close contact with the upper mold frame or the upper mold cavity block in the longitudinal direction by a pushing force (or using a fluid pressure such as hydraulic pressure, pneumatic pressure or the like) due to a strong spring elasticity. And since it is a structure which floats with an upper metallic mold, even if a molten resin gives a shock to a shielding frame block with strong fluid pressure, it does not flow outside.

Further, when the pressurization by the upper and lower dies is completed, as shown in FIG.
When it floats with the projection 3 of the lower mold frame 33 in the longitudinal direction.
The resin that has entered the gap 8 between the base 31 and the upper mold frame 42 also receives a pressurized tonnage with a small area of the protruding portion 331 on the inner side. It is a degree that remains as an extremely thin burr. Similarly, as shown in FIG. 7, when the short-direction band-shaped protrusion forming portion 45 floats together with the upper mold 4, the projecting portion 322 of the short-direction lower mold frame 32 and the short-direction band-shaped protrusion forming portion 45 The resin which has entered the gap 8A receives the pressurized tonnage in the small area of the protruding portion 322 on the inner side, so that even if horizontal burrs are generated, the thickness of the resin remains as an extremely thin horizontal flash.

Therefore, the finishing operation can be performed with, for example, a cutter knife, and even if the operation is unsatisfactory, there is no problem in use.

[0113]

According to the present invention, the use of the mold for variable-size molding of a plastic control panel of the present invention makes it possible to form a plastic control panel using glass fiber as a composite material, which cannot be formed by conventional injection molding or injection compression molding. Molding became possible.

Further, the molding of the plastic control panel made of a thermoplastic synthetic resin using glass fiber as a composite material does not cause abrasion of the mold, and various plastic control panels respond to the user's needs, and the user pays for the mold amortization. It can be supplied without.

Further, by using the mold for variable-size molding of the plastic control panel of the present invention, it is possible to drastically reduce the cost of the construction and civil engineering industry, which has a great ripple effect on this kind of industry.

By using the mold for variable-size molding of the plastic control panel of the present invention, plastic control panels using glass fibers of various sizes as composite materials can be supplied at a low cost, and the demand for large quantities of wood for wooden concrete panels can be suppressed. Can greatly contribute to the protection of the global environment.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing upper and lower dies used in conventional press forming, without a belt-like projection continuous with a surface of a plastic control panel.

FIG. 2 is a cross-sectional view schematically showing upper and lower dies used in conventional press molding, and has a band-shaped projection continuous with the surface of a plastic control panel.

FIG. 3 is a cross-sectional view schematically showing upper and lower dies used in conventional press molding, which have band-shaped projections continuous with the surface of a plastic control panel, and have a mold structure different from that of FIG. is there.

FIG. 4 is a cross-sectional view schematically showing upper and lower molds used for conventional injection molding.

FIG. 5 is a schematic perspective view of the plastic control panel formed according to the present invention as viewed from the back surface.

FIG. 6 is a cross-sectional view of a corner in a longitudinal direction (X-axis) of a molding die of the present invention.

FIG. 7 is a sectional view of a corner in a short direction (Y axis) of a molding die of the present invention.

FIG. 8 is a cross-sectional view showing details of a nozzle portion provided in a center portion of a rear surface of the plastic control panel when a nozzle port is opened.

FIG. 9 is a cross-sectional view showing details of a nozzle portion provided at the center of the rear surface of the plastic control panel when the nozzle port is closed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Plastic control panel (Plastic concrete casting formwork) 11, 12 Four-sided frame (of plastic control panel) 13, 14 Rib (of plastic control panel) 2 Cavity space 3 Lower mold 31 Cavity block 32 Short dimension lower mold 321 Groove 322 Projecting portion 33 Longer lower mold frame 331 Projecting portion 332 Fitting groove 333 Bottom surface 334 Bolt hole 335 Bolt 336 Head 34 Short band-like projection (of plastic control panel) 3A, 3B, 3C Cavity block 4 Upper metal Mold 41 Upper mold cavity plate 42 Long direction upper mold frame 43 Bolt 44 Long direction band-shaped protrusion forming portion 45 Short direction band-shaped protrusion forming portion 46 Long direction direction band-shaped protrusion (of plastic control panel) 5 Nozzle port 51 Nozzle 52 Valve stem 6 Shielding frame block 61 Projecting portion 62 Bottom surface 7 Compression coil spring 8, 8A Between

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 45/00-45/84 B29C 33/00-33/76

Claims (2)

(57) [Claims] When the mold closing of the mold is completed, the forward switching oil supply port of the mold closing cylinder is connected to the drain circuit by switching the direction switching valve of the mold closing forward hydraulic circuit to neutral. To a pressureless state, and by supplying a molten resin using glass fiber as a composite material into the closed mold, the movable mold is retracted, and a set amount of the molten resin is set in the cavity space of the mold. After filling is completed
A mold for forming a concrete concrete casting mold using a mold clamping mechanism that clamps the mold at a high pressure by switching the direction of the mold clamping forward hydraulic circuit direction switching valve to the forward side.
Therefore, the upper mold on the movable side must be dimensioned in the short and long directions.
Each mold has a fixed mold structure, while the lower mold on the fixed side has the short dimension fixed.
In addition to having a reconfigurable mold structure with variable dimensions only in the direction, the plastic concrete casting
A belt-like projection continuous with the surface of the formwork on the outer surface of the square frame
In order to be able to mold, the upper mold long-side direction corners and the
At the corner of the short side direction of the lower mold, a long direction band-shaped projection is formed.
A dimensionally variable molding die for a plastic concrete casting mold using glass fiber as a composite, characterized by forming a shaped portion and a short-side direction band-shaped projection forming portion . 2. The lower mold in the longitudinal direction of the lower mold on the fixed side.
On the frame and the short dimension lower mold frame, shielding frame blocks are inserted and provided to prevent the molten resin from flowing out during injection of the molten resin into the mold and during pressurization. 2. The plastic concrete casting using a glass fiber as a composite material according to claim 1, wherein the shielding frame block is operated in a state of being strongly adhered to the upper mold using elasticity or fluid pressure. Mold for variable-size molding of molds.