JP2001269958A - Manufacturing method of resin molding and mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for easily manufacturing a large molding without needing a cramping device having large dimensions and the clamping work and application of pressure for material injection. SOLUTION: In a molding method using a thermosetting resin material, the thermosetting resin material is charged into a mold 1, mold registering is performed, and mold cramping is performed for molding not by the cramping press under an external pressure but by the decompression of the insides of the molds 1, 2 in order to manufacture the resin molding.

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.

[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.

[0004] In molding using fibers, since a fiber reinforcing material is set inside a molding die, there is a flow resistance of the injected resin, and the resin cannot be injected quickly unless the injection pressure is increased. In order to quickly inject, the mold must have strength to withstand high injection pressure. Also, if the injection pressure is lowered, there is a problem that it takes a long time to inject the resin material and the productivity is deteriorated.

Injecting resin into the clamped mold is difficult to balance the viscosity of the resin material, the pressing speed, etc., and when the rigidity of the mold is weak, the deformation of the mold due to external pressure can be reduced. If the material and the injection conditions are not balanced, there is a problem that unevenness occurs in the thickness of the molded product. The present invention has been made in view of the above circumstances, and has as its object to provide a method for manufacturing a resin molded body that can easily produce a large molded body without performing pressing by a large external pressure.

[0006]

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 charged into a molding die without applying pressure, the molds are aligned, and a mold clamping press by external pressure is not performed. And a method for producing a resin molded article which is molded by clamping the mold by reducing the pressure in the mold.

(2) In a molding method using a thermosetting resin material, the mold is matched, and the thermosetting resin material is put into the molding die without applying pressure, and the mold clamping press by external pressure is not performed. And a method for producing a resin molded body in which the inside of the mold is depressurized and molded by clamping.

(3) The reduced pressure is from 2.5 cmHg to 20 cmHg.
The method for producing a resin molded product according to any one of (1) and (2), which is performed in a range of cmHg.

(4) A step of setting the fiber reinforcing material in the female mold, a step of introducing the compounded resin into the female mold without applying pressure, and a step of arranging the male mold in the female mold and lightly clamping the mold. , The process of depressurizing the male and female molds,
A method for producing a resin molded article, comprising: a step of closing and curing and curing the pressure reducing holes.

(5) In molding a resin molded article, a step of setting a fiber reinforcing material in a female mold, a step of arranging a male mold and lightly clamping the mold, Injection molding, closing the material injection hole and reducing the pressure in the male and female molds, and closing and curing and curing the reduced pressure hole when the compounded resin overflows in the reduced pressure hole. How to make the body.

(6) It is composed of a combination of male and female molds. The female mold is configured to directly charge the compounded resin without pressure, and the male mold is directed outward from the mold mating surface inside the seal. A resin mold in which a pressure reducing hole is formed, and a pressure reducing means is connected to the pressure reducing hole.

(7) The male mold has a combination of male and female molds, and the male mold has a decompression hole formed from the mating surface inside the seal to the outside of the mold, and a decompression means is connected to the decompression hole. The male mold is a resin mold having a non-pressurized material injection hole that penetrates from the outside to the molding section.

(8) The seal is disposed opposite to each of the male and female molds, and the female seal has a concave part formed on the upper surface and is fitted in the female seal concave part (6). )
The resin mold according to any one of (7).

(9) The pressure-reducing means is from 2.5 cmHg to
The resin mold according to any one of (6) and (7), which is a low-pressure decompressor in a range of 20 cmHg.

[0016]

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) denotes a molding surface, (4) denotes a seal, (5) denotes a material injection hole, (6) denotes a pressure reducing hole, and (7) denotes a pressure reducing means.

A preformed fiber (8) in which a fiber reinforced material (glass fiber or the like) is formed in advance (a fiber reinforced mat cloth or the like without preforming) may be used in the molded portion of the female mold (1). ) Was set. The male mold (2) was lightly tightened on the female mold (1) until the seal (4) face was reached.
Then, the compounded resin was injected from the material injection hole (5) 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 (5), and when the compounded resin has completely entered the mold, the material injection hole (5) is formed. )
The pressure inside the molds (1) and (2) was reduced at a low pressure (2.5 cmHg to 20 cmHg) by a pressure reducing means (7) connected to the pressure reducing hole (6).

The air inside the molding dies (1) and (2) is depressurized while being slowly pulled down by the decompression means (7) to close the mold. Then, the pressure reducing hole (6) 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 seal (4) is in a floating state, so that the compounded resin is not pressurized through the material injection hole (5). However, they enter 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 formed from the mold mating surface (3) outward and upward, and the mold is clamped by reducing the pressure inside the molding dies (1) and (2). And preform fiber (7)
Air bubbles between the fibers are sucked out, 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.
Often wrapped around, the result led to frequent occurrence of defective products, but in the present invention, by reducing the pressure inside the molds (1) and (2), any fine bubbles between fibers,
It can be completely sucked out between the fibers.

[0025] Further, by reducing the pressure at a low pressure so as to be drawn at a speed lower than the flow speed of the compounded resin, the molding die is formed.
(1) The resin material is drawn uniformly without imposing a heavy burden on (2). 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 mold can be reduced.

In the conventional molding method, since 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, the male and female molds (1) and (2) Presses the resin material inside the mold, so that a large-scale mold clamping device and work as in the prior art are completely unnecessary.

In other words, much less force is required to pull the gas in the mold out under reduced pressure than to push a viscous fluid under a strong external pressure. Thereby, the equipment and the mold structure can be significantly simplified.

FIG. 3 is a vertical sectional front view of a molding die showing production of a deep tank or the like. First, in FIG. 3, the male mold (2) is removed, and the preform fiber (8) 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.

Thereafter, the male mold (2) is set and lightly tightened until the upper and lower seals (4) and (4) come into contact. The seal (4) of the female mold (1) has a recess formed on the upper surface, and the seal (4) of the male mold (2) is in close contact with the recess of the lower seal (4), and the contact area between the seals is small. As the size increases, the closeness is excellent, and the depressurizing action becomes effective quickly. When light pressure is applied to the molds (1) and (2), the mold is slowly closed by the negative pressure.

The pressure is reduced at a low pressure until the compounded resin comes out from the pressure reducing hole (6).
Close (6). As a result, since the molding dies (1) and (2) are tightly closed by the internal negative pressure, the outer periphery of the molding dies (1) and (2) does not float up and down so that no mold displacement occurs. Fix it.

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 immediately without pressure, as in a bucket or hose, so that the time for material injection is extremely short.

In addition, by adjusting the mold and reducing the pressure at a low pressure, the mold is naturally tightened and inevitably presses the resin, so that large-scale equipment and troublesome work are not required.

Although the above description has been given of the molding using the preform fiber, the present invention relates to an FRP type in which a fiber reinforced material (such as a cloth mat) is disposed in a molding die, and a 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.

[0035]

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

(1) In a molding method using a thermosetting resin material, a thermosetting resin material is put into a molding die without applying pressure, the molds are aligned, and a mold clamping press by external pressure is not performed. In addition, the method of manufacturing a resin molded body that is molded by clamping the mold by depressurization in the mold is capable of molding a large molded body with a low-pressure depressurizer and a simple molding die, so large equipment and complicated work are required. There is an effect that it can be easily implemented in a small factory without need.

(2) In a molding method using a thermosetting resin material, the mold is matched, and the thermosetting resin material is put into the molding die without pressure, and the mold clamping press by external pressure is not performed. In addition, the method of manufacturing a tree molded body molded by clamping the mold by applying reduced pressure in the mold does not require an external mold clamping device or material injection device requiring a strong pressure, and the thermosetting resin material is used. Can be injected into the mold without applying pressure, and there is an effect that molding can be easily performed by reducing the pressure in the mold.

(3) In the above (1) and (2), 2.5 cmH
g to 20 cmHg, the method for producing a resin molded body at a low pressure in a low pressure range is a low pressure.
In addition, since the pressure is low, a large rigidity is not required for the molding die, so that there is an effect that a lightweight and simple molding die can be used for molding a large product.

(4) A step of setting the fiber reinforcing material in the female mold, a step of introducing the compounded resin into the female mold without applying pressure, and a step of arranging the male mold in the female mold and lightly clamping the mold. , The process of depressurizing the male and female molds,
The method of manufacturing a resin molded body consisting of the step of closing and curing the resin under pressure reduction and curing is performed by simply feeding the compounded resin into the female mold set with the fiber reinforcing material without applying any pressure. Even if it is used, there is an effect that the compounded resin can be filled in a very short time. Next, since the mold is clamped by applying a low pressure, the bubbles between the fibers of the fiber reinforced material are completely sucked out, and the corners of the complicated shape can be completely and completely filled with the compounded resin. There is.

(5) 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 from the mold material injection hole without pressure. The method of manufacturing a resin molded body, which comprises a step of reducing the pressure in the male and female molds and a step of closing and curing and curing the reduced pressure hole when the compounded resin overflows in the reduced pressure hole, requires an extra space in the molding portion. Since the compounded resin is injected without pressure when it is vacant, the required amount of the compounded resin can be injected in a very short time, which has the effect of improving workability.

(6) It is composed of a combination of male and female molds. The female mold is configured to directly charge the compounded resin under no pressure, and the male mold is directed outward from the mating surface inside the seal. A molding die in which a decompression hole is formed and a decompression means is connected to the decompression hole has an effect that a compounded resin can be directly injected into a female mold without pressurization in a short time. In addition, there is an effect that the resin can be completely filled between the fibers and molded by simply reducing the pressure from the pressure reducing hole without requiring a large-scale mold clamping device or operation.

(7) The male mold has a combination of male and female molds, and the male mold has a decompression hole formed from the mating surface inside the seal to the outside of the mold, and a decompression means is connected to the decompression hole. The male mold has a non-pressurized material injection hole that penetrates from the outside to the molded part.The mold can be filled with the compounded resin in a short time without pressure. There is an effect that the resin can be completely and uniformly filled between the fibers and molded without requiring any apparatus or operation.

(8) The seal is provided to face each of the male and female molds, and the female seal has a concave seal formed on the upper surface and is fitted in the female seal fitting concave part (6). )
The resin mold described in any one of (7) has an effect that the contact area of the upper and lower seals is large, the adhesion is excellent, and the decompression action can be improved.

(9) In the method and the mold,
Since no pressure is used for charging the resin, the mold can be simplified, the cost of the mold can be reduced, and there is no need for a crane, etc. due to weight reduction, and there is no need for a large mold clamping device and work. There is an effect that a large compact can be easily manufactured even in a small factory without requiring equipment.

(10) Since no pressure is required for filling the resin, it is possible to charge the resin in a very short time and to ensure uniform filling of the resin even in a complicated shape. There is an effect that productivity can be improved. 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 type (2) Male type (3) Mold mating surface (4) Seal (5) Material injection hole (6) Pressure reducing hole (7) Pressure reducing means (8) 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

Claims (9)

[Claims] In a molding method using a thermosetting resin material, a thermosetting resin material is charged into a molding die without applying pressure, and the molds are aligned and a mold clamping press by external pressure is not performed. And a method for producing a resin molded article, wherein the molded article is clamped and molded by reducing the pressure in the mold. 2. In a molding method using a thermosetting resin material, a mold is set and a thermosetting resin material is charged into a molding die without applying pressure, and a mold clamping press by an external pressure is not performed. And a method for producing a resin molded article, wherein the molded article is clamped and molded by reducing the pressure in the mold. 3. The reduced pressure is 2.5 cmHg to 20 cm.
The method according to claim 1, wherein the method is performed at a low pressure in a range of Hg. 4. A step of setting a fiber reinforcement in a female mold,
A step of introducing the compounded resin into the female mold without pressure, a step of arranging the male mold on the female mold and lightly clamping the mold, a step of reducing the pressure in the male and female molds, and a overflow of the compounded resin in the pressure reducing holes. And a step of closing the pressure reducing hole at the time of curing and curing and curing the resin. 5. A step of setting a fiber reinforcement in a female mold,
A step of disposing a male mold and lightly clamping the mold, a step of injecting a compounded resin without pressure from a material injection hole of the mold, a step of closing the material injection hole and reducing the pressure in the male and female molds, And a step of closing and curing and curing the decompression holes when the compounded resin overflows. 6. A female / male type combination, wherein the female type is configured to directly charge the compounded resin without pressure, and the male type is
A resin molding die, characterized in that a decompression hole is formed from a mating surface inside the seal to the outside of the mold, and a decompression means is connected to the decompression hole. 7. A male and female type combination, wherein the male type has a decompression hole formed from the mating surface inside the seal to the outside of the die, and a decompression means is connected to the decompression hole. Types include
A resin molding die having a non-pressurized material injection hole penetrating from the outside to a molding portion. 8. The female seal is provided so as to face each of the male and female molds, and the female seal is 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 and 7. 9. The method according to claim 9, wherein the pressure reducing means is 2.5 cmHg to 20 cmHg.
The resin mold according to any one of claims 6 and 7, wherein the resin mold is a low-pressure decompressor in a range of cmHg.