JP2002036257A - Method and mold for manufacturing resin molded object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for simply and easily molding a large molded object without requring a large-sized mold clamping device or work and requiring pressure in the injection of a material. SOLUTION: In a molding method using a thermosetting resin material, the thermosetting resin material is charged in the molding part 1a of mating molds 1 and 2 without being pressurized not only to mate the molds but also to reduce the pressure in the gap between inner and outer double seals 4 and 5 arranged between the opposed surfaces of the mating surface 3 of the outer peripheral edge part of the molding part 1a to clamp the molds. By this method, the resin molded object is manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a resin molded product and a molding die, and more particularly to a molding method using a thermosetting resin material without using an external strong press. The present invention relates to a method for producing a resin molded article that can be molded and a molding die.

[0002]

2. Description of the Related Art Conventionally, in the process of manufacturing a resin molded body using a thermosetting resin material, a male and female mold is pressed by applying pressure from a large device from outside the molding die. I have. Further, after the male and female molds are clamped with a clamp or an air bag, the resin material is injected into the mold under a large pressure. Also, a proposal is made in which a resin material is introduced into a molding die without applying pressure, and the mold is clamped by reducing the pressure in the mold without performing a mold clamping press by an external pressure (Japanese Patent Application No. 20-163).
00-086834) has also been made by the present applicant.

[0003]

The above-described press using an external pressure requires a press machine, and a large pressurizing device is required to press the compounded resin having a high viscosity by applying an external pressure. A robust mold is required, and the equipment and the mold are very expensive. In particular, in order to manufacture a large product, a crane is required for moving a robust and heavy mold, and there is a difficulty that workability deteriorates.

In molding using a fiber reinforcing material, since the fiber reinforcing material is set inside the mold, there is a flow resistance of the injected resin, and if the material injection pressure is not increased, the compounded resin can be injected quickly. Can not. To inject quickly,
Molds must have strength to withstand high injection pressures. Also, if the injection pressure is reduced, there is a problem that it takes a long time to inject the compound resin material and the productivity is deteriorated.

Pressing a compounded resin material into a clamped mold is difficult to balance the viscosity, pressurization speed, etc. of the compounded resin material, and when the rigidity of the mold is weak, molding is performed by external pressure. If the mold is deformed and the material and the injection conditions are not balanced, there is a problem that the thickness of the molded product becomes uneven.

Further, in the method of reducing the pressure in the molding die, there is also a problem that the charged compounded resin material moves in a reduced pressure direction. The present invention, in view of those circumstances,
It is an object of the present invention to provide a method for manufacturing a resin molded body and a mold that can easily produce a large molded body without performing pressing by externally large pressure.

[0007]

The present invention employs the following technical means in order to solve the above problems and achieve the object. The term "preform fiber" as used herein refers to a fiber which has been molded in advance into a shape to be molded by spraying a fiber reinforcing material (glass, carbon or other fiber) together with a resin onto a mold surface, or by manually attaching it. . The compounded resin refers to a soft candy resin in which various materials necessary and sufficient for FRP molding and other moldings are compounded. The specific contents of the invention are as follows.

(1) In a molding method using a thermosetting resin material, a thermosetting resin material is introduced into a molding portion of a mating die without applying pressure, the molds are aligned, and an outer peripheral edge portion of the molding portion is formed. A method for producing a resin molded body, which is formed between inner and outer double seals, which is disposed between facing surfaces of a mold, and is formed by clamping and molding.

(2) In a molding method using a thermosetting resin material, the mating die is set, and the thermosetting resin material is charged into the molding die without applying pressure, so that the outer peripheral edge of the molding portion is formed. A method for producing a resin molded body, which is formed between inner and outer double seals disposed between two facing surfaces of a mating surface of a part, thereby clamping and molding the resin molded body.

(3) A fiber reinforced material is set in the female mold, and the compounded resin material is injected into the female mold without pressure, and the male mold is arranged in the female mold and lightly clamped to form the female and male molds. A method for producing a resin molded body, wherein the molded body is clamped and molded by reducing the pressure inside the inner and outer double seals disposed between the facing surfaces of the mold outside the molded part.

(4) a step of setting the fiber reinforcing material in the female mold, a step of arranging the male mold and lightly clamping the mold, and a step of injecting the compounded resin without pressure from the mold material injection holes; Closing the material injection holes and depressurizing and clamping the mold between the inner and outer double seals disposed between the facing surfaces of the male and female molds outside the molding part. A method for producing a resin molded article.

(5) The reduced pressure is from 1.5 cmHg to 20 cmHg.
The method for producing a resin molded article according to any one of (1) and (2), wherein the method is performed at a low pressure in a range of cmHg.

(6) A double-sided seal is provided between the facing faces of the male and female molds at the outer peripheral edge of the molded part of the male and female molds. A decompression hole is formed so as to communicate between the inner and outer double seals from the outside, and a decompression means is connected to the depressurization hole to perform depressurization between the inner and outer double seals to perform mold clamping. A resin mold configured as described above.

(7) The female mold is configured to directly charge the compounded resin without pressure, and the male mold has a material drawing hole from the mold mating surface inside the inner and outer double seals to the outside of the mold. The resin molding die according to (6), wherein the material drawing means is formed and a material drawing means is connected to the material drawing hole.

(8) The male mold has a combination of male and female molds, and the male mold has a material drawing hole formed outwardly from the mold mating surface inside the inner and outer double seals. The resin mold according to (6), wherein a pulling means is connected, and the male mold is formed with a non-pressurized material injection hole penetrating from the outside to the molding part.

(9) The inner and outer double seals are disposed so as to face the male and female molds respectively, and the female seals are formed by fitting the seals having recesses formed on the upper surface into the female seal fitting recesses. (6) The resin mold according to any one of (7) to (7).

(10) The pressure reducing means is 1.5 cmHg ~
The resin mold according to any one of (6) to (8), which is a low-pressure decompressor in a range of 20 cmHg.

[0018]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional front view of a molding die, and FIG.
FIG. 2 is a longitudinal sectional front view of a closed mold.

The molds (1) and (2) are composed of a female mold (1) and a male mold (2). In the figure, reference numeral (3) indicates a mating surface, (4) and (5) indicate inner and outer double seals, (6) indicates a pressure reducing hole, (7) indicates a pressure reducing means, and (8).
Denotes a material injection hole, (9) denotes a material drawing hole, and (10) denotes a material drawing means.

A preform fiber (11) in which a fiber reinforcing material (glass fiber or the like) is preliminarily formed in a molding portion (1a) of the female mold (1).
(It is also possible to use a fiber reinforced mat or cloth without preforming.) This female type (1)
The male mold (2) was lightly tightened on the surface until the inner and outer double seals (4) and (5) came into contact. Then, the compounded resin was injected from the material injection hole (8) without pressure.

In this case, a theoretical amount of the compounded resin required for the molded body is put into a funnel above the material injection hole (8), and when the compounded resin has completely entered the molding die, the material injection hole (8) is formed. By closing the mouth of 8), by the decompression means (7) connected to the decompression hole (6),
Mold at low pressure (1.5cmHg ~ 20cmHg) (1) (2)
The inner and outer double seal (4) between the facing surfaces of the mold mating surface (3)
(5) The inside pressure was reduced.

The inside air between the inner and outer double seals (4) and (5) is depressurized by the decompression means (7) while slowly pulling the mold to close the mold, and the inner and outer double seals (4) and (5) are crushed. And
When the compounded resin emerged from the material drawing hole (9), the material drawing hole (9) was closed, and the outer peripheries of the male and female molds (1) and (2) were fixed (see FIG. 2).

By curing in this state with the mold clamped, the compounded resin was cured, and a shallow box-shaped resin molded product (not shown) was completed.

As can be clearly understood from FIG. 1, the male mold (2) supported by the inner and outer double seals (4) and (5) is in a floating state. ) And without pressure, it enters into the forming part (1a) of the molds (1) and (2) without resistance. Therefore, in the production of any large-sized molded product having a side exceeding 2 meters, the required amount of material can be filled in the molding dies (1) and (2) in a very short time.

Next, the decompression hole (6) is provided with a double inner and outer seal (4).
(5) is formed from the mating surface (3) between the outside and upward, and by reducing the pressure between the inner and outer double seals (4) (5), the male and female molds (1) ( The mold is clamped in 2), and the air bubbles between the fibers of the preform fiber (11) are pushed out from the material drawing hole (9), and the compounded resin permeates completely between the fibers.

That is, in the conventional molding method, since the compounded resin is injected by a strong external pressure, small bubbles between the fibers are trapped between the fibers as they are, and the resin flows.
They often wrap around, which resulted in more rejects.

However, according to the present invention, the mold can be completely clamped by reducing the pressure between the inner and outer double seals (4) and (5) of the matched molds (1) and (2). Therefore, in the compound resin pressed by the approach of the male and female molds (1) and (2), any fine bubbles between the fibers can be completely extruded from between the fibers.

The forming part (1a) is depressurized by a drawing means (10) such as a pressure reducing machine through a drawing hole (9) at a low pressure so as to be drawn at a speed lower than the flow speed of the compounded resin. By
A large load is not applied to the molds (1) and (2), and the compounded resin material is uniformly drawn and enters the molding section (1a). Therefore, since it is not necessary to increase the strength of the molds (1) and (2), the cost of the mold is significantly reduced. Naturally, the weight of the molds (1) and (2) can be reduced.

In the conventional molding method, the compounded resin is injected under pressure. If the mold clamping of the male and female molds (1) and (2) is not firmly performed, the mold will be misaligned. Although large equipment and work were required, such as using airbags and airbags, in the present invention, by reducing the pressure between the inner and outer double seals of the matched molds (1) and (2) at low pressure, Since the male and female molds (1) and (2) are close to each other and clamped, and the compound resin material inside the mold is pressed, the mold clamping can be completed completely and speedily with an extremely small decompression force.

As a result, the conventional large-scale mold clamping device and work are completely unnecessary. In other words, pulling the gas inside the mold under reduced pressure is much smaller than pushing a viscous fluid such as a compounded resin into the mold under a strong external pressure. No problem. Thereby, the equipment and the mold structure can be significantly simplified.

FIG. 3 is a vertical sectional front view of a molding die showing the production of a deep tank or the like. The same members as those in all the examples are denoted by the same reference numerals, and description thereof will be omitted. First, in FIG. 3, the male mold (2) is removed, and the preform fiber (11) is set in the molded portion of the female mold (1). Thereafter, a theoretical amount of a compounded resin required for molding the molded body is poured into the female mold (1) so as to be poured without pressure.

Then, the male mold (2) is set and lightly tightened until the upper and lower seals (4), (4), (5) and (5) come into contact. Female mold
The inner and outer double seals (4) and (5) of (1) have concave portions formed on the upper surface, and the inner and outer double seals (4) and (5) of the male mold (2) correspond to the lower inner and outer double seals. The seals (4) and (5) are in close contact with the recesses, and the contact area between the upper and lower seals is large, so that close contact is excellent,
The decompression effect becomes effective quickly. When the inside and outside of the double seals (4) and (5) are lightly depressurized by the pressure reducer (7), the male and female molds (1) and (2) are slowly clamped by the negative pressure.

Until the compound resin comes out from the material drawing hole (9),
The molding portion (1a) is depressurized at a low pressure by the material drawing means (10), and when the compounded resin comes out of the material drawing hole (9), the pressure reducing hole (9) is closed. As a result, the molding dies (1) and (2) are tightly closed by the internal negative pressure between the inner and outer double seals (4) and (5). ) Fix the outer circumference of (2) so that it does not float up and down.

Thus, if cured, the mold (1)
The compounded resin in (2) is cured to form a deep tank-shaped molded body (not shown). As described above, even with a large molded body having a side exceeding 2 meters, a large external material injection pressure is not applied to the molding dies (1) and (2). In time, the mold cost burden can be reduced. Naturally, with the reduction in the weight of the mold, no large-scale equipment for work is required, and workability is improved.

In the method of the present invention, as described above, the compounded resin is not pressed into the mold by applying an external pressure.
In the extreme case, the material can be put into the mold directly without pressure, as in the case of water with a bucket or a hose, so that the time for material injection is extremely short.

In addition, by matching the molds and depressurizing the small area between the inner and outer double seals at a low pressure,
Since the mold can be clamped in a short time and with a small force, and the compounded resin in the mold is inevitably pressed, large-scale equipment and troublesome work are not required.

Although the description has been given of the molding using the preform fiber, the present invention relates to the FRP type in which the fiber reinforced material (such as a cloth mat) is disposed in a molding die, and the fiber reinforced material. It can be applied to all the moldings that do not use the thermosetting resin material. That is, for example, molding of artificial proxy stone, urethane injection molding, and the like can also be performed without resin injection under pressure and molding without a mold pressing machine.

[0038]

The present invention configured as described above has the following excellent effects.

(1) According to the first aspect of the present invention, a thermosetting resin material is introduced into a molding portion of a mating die without pressure.
After mold matching, the mold is clamped and molded by reducing the pressure between the inner and outer double seals disposed between the facing surfaces of the mold at the outer peripheral edge of the molded part. The mold can be clamped by reducing the pressure with a reduced pressure. As a result, a large compact can be molded with a small low-pressure decompressor and a simple molding die without using a mold clamping press by external pressure, and without requiring large-scale equipment and complicated work, There is an effect that can be easily implemented. In addition, there is an effect that a load of decompression is not applied to the mold.

(2) According to the second aspect of the present invention, the thermosetting resin material is introduced into the molding die without applying pressure, and the thermosetting resin material is disposed between the facing surfaces of the molding surface of the outer peripheral edge of the molding portion. Because the mold is clamped and formed by reducing the pressure between the inner and outer double seals, an external mold clamping device or material injection device requiring strong pressure is required without using a mold clamping press by external pressure. It is possible to form a large compact with a small low-pressure decompressor and a simple mold without the need for large-scale equipment and complicated work, and it can be easily implemented in a small factory. is there.

(3) According to the third aspect of the present invention, a fiber reinforced material is set in a female mold, and a compounded resin material is charged into the female mold without applying pressure. By reducing the pressure between the inner and outer double seals disposed between the facing surfaces of the mold, the mold is clamped and molded, so that the compounded resin can be filled in a very short time. . In addition, since the mold is clamped by reducing the pressure at a low pressure, the bubbles between the fibers of the fiber reinforcing material are also completely extruded, so that the compounded resin can be uniformly and completely filled even in the corners of the complicated shape, It has the effect of improving quality.

(4) According to a fourth aspect of the present invention, a fiber reinforced material is set in a female mold, the compounded resin is injected without pressure from the material injection hole of the molding die, and the material injection hole is closed. At the time when an extra space is available in the molded part to reduce the pressure between the inner and outer double seals disposed between the facing surfaces of the male and female molded parts on the outer periphery of the molded part Thus, the compounded resin can be injected without pressure, and the required amount of the compounded resin can be injected in a very short time, which has the effect of improving workability.

(5) The invention as set forth in claim 5 is characterized in that 1.5c
Since the pressure is reduced at a low pressure in the range of mHg to 20 cmHg,
As the pressure reducer, a small pressure generator is sufficient, and the burden on equipment costs is small, and there is an effect that no burden is imposed on the mold.

(6) The invention according to claim 6 is characterized in that a double inner and outer seal is provided at the outer peripheral edge of the male and female molded part,
The resin mold is designed to clamp the mold by reducing the pressure between the heavy seals, so no large mechanical equipment is required for mold clamping, and the burden on the mold due to pressure is small. Can be As a result, the workability is excellent, and there is an effect that a large molded product can be easily manufactured by a small number of people in a small factory.

(7) The invention according to claim 7 has the effect that the compounded resin can be directly introduced into the female mold without pressurization in a short time. Further, by merely reducing the pressure between the inner and outer double seals, there is an effect that the compounded resin can be completely filled between the fibers and molded without requiring a large-scale mold clamping device or operation.

(8) According to the eighth aspect of the present invention, since the compounded resin can be filled in a short time without applying pressure, and the mold is clamped by reducing the pressure between the inner and outer double seals, a large mold clamping is achieved. There is an effect that the compounded resin can be completely uniformly filled between the fibers and molded without requiring any equipment or operation.

(9) According to the ninth aspect of the present invention, when the pressure inside the inner and outer double seals is reduced, the area of close contact between the upper and lower seals is widened, and the effect of reducing the pressure can be enhanced.

(10) The invention as set forth in claim 10 is characterized in that:
By using a low-pressure decompressor in the range of cmHg to 20 cmHg, mold clamping can be speeded up, and there is an effect that large-scale mechanical facilities required for mold clamping and complicated work are not required. At the same time, the burden of the mold on the negative pressure is light, and the weight of the mold can be reduced.

(11) In the method and the molding die of the present invention, pressure is not used for clamping and charging the compounded resin.
The molding die can be simplified, the cost of the molding can be reduced, and large moldings are not required, such as no need for cranes due to weight reduction, no large-scale mold clamping devices, and no large-scale equipment. Can be easily manufactured even in a small factory.

(12) Since no pressure is required for filling the compounded resin, it is possible to charge the compounded resin in an extremely short time and to uniformly fill the compounded resin even in a complicated shape. This has the effect of significantly shortening and improving the productivity. At the same time, the quality of the product is improved on average.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a molding die.

FIG. 2 is a vertical sectional front view showing a state in which a mold is clamped.

FIG. 3 is a vertical sectional front view of a molding die showing a second embodiment.

[Explanation of symbols]

 (1) Female mold (1a) Molded part (2) Male mold (3) Mold mating surface (4) (5) Double seal inside and outside (6) Pressure reducing hole (7) Pressure reducing means (8) Material injection hole (9 ) Pulling hole (10) Pulling means (11) Preform fiber (fiber reinforced material)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29K 105: 08 B29K 105: 08 F term (Reference) 4F202 AA36 AD16 AM03 AM28 AR02 CA01 CB01 CB11 CK86 CL40 CP01 CP04 CP06 CQ01 4F204 AA36 AD16 AM03 AM28 AR02 EA03 EA04 EB01 EB11 EF01 EF27 EK01 EK09

Claims (10)

[Claims] In a molding method using a thermosetting resin material, a thermosetting resin material is charged into a molding portion of a mating die without applying pressure, and the molds are aligned and the outer peripheral edge of the molding portion is formed. A method for manufacturing a resin molded body, characterized in that a mold is clamped and molded by reducing the pressure between inner and outer double seals disposed between facing surfaces of a mold. 2. A molding method using a thermosetting resin material, wherein a matching die is set, and a thermosetting resin material is charged into the molding die without applying pressure. A method for producing a resin molded body, characterized in that the pressure is reduced between the inner and outer double seals disposed between the facing surfaces of the mold and the mold is clamped and molded. 3. A fiber reinforced material is set in the female mold, and the compounded resin material is charged into the female mold without pressure, and the male mold is arranged in the female mold and lightly clamped. A method for producing a resin molded product, comprising: performing mold-clamping and molding by reducing the pressure between inner and outer double seals disposed between facing surfaces of a molding surface of a molded portion outer peripheral edge. 4. A step of setting a fiber reinforcement in a female mold,
A step of disposing the male mold and lightly clamping the mold, a step of injecting the compounded resin without pressure from the material injection hole of the mold, and a step of closing the material injection hole and forming the male and female mold mating surfaces outside the molding portion. A process of reducing the pressure between the inner and outer double seals disposed between the facing surfaces and clamping the mold. 5. The reduced pressure is 1.5 cmHg to 20 cm.
The method for producing a resin molded product according to any one of claims 1 to 4, wherein the method is performed at a low pressure in a range of Hg. 6. A male / female mold combination, wherein an inner / outer double seal is disposed between opposing mating surfaces at an outer peripheral edge of a molded part of the male / female mold. A decompression hole is formed so as to communicate with the inside of the inner and outer double seals from outside, and a decompression means is connected to the depressurization hole to perform depressurization between the inner and outer double seals to perform mold clamping. A resin mold having the above-mentioned configuration. 7. The female mold is configured to directly charge the compounded resin without pressure, and the male mold has a material drawing hole formed from the mold mating surface inside the inner and outer double seals to the mold outer side. The resin molding die according to claim 6, wherein a material drawing means is connected to the material drawing hole. 8. A male and female type combination, wherein the male type has a material drawing hole formed outwardly from the mold mating surface inside the inner and outer double seals, and the material drawing hole is formed in the material drawing hole. 7. The resin molding die according to claim 6, wherein means is connected, and the male die is formed with a non-pressurized material injection hole penetrating from the outside to the molding portion. 9. The double inner and outer seals are disposed opposite to each other in the male and female molds, and the female seals are formed by fitting a seal having a concave portion on the upper surface into a female seal fitting concave portion. The resin mold according to any one of claims 6 to 7, wherein: 10. The pressure reducing means is 1.5 cmHg to 20 cmHg.
The resin mold according to any one of claims 6 to 9, which is a low-pressure decompressor in a range of cmHg.