JPH0219768B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing cold-curing resin products. Conventionally, in the production of cold-setting resin products, a mold release agent is applied to the surface of the product cavity of a mold, the mold is closed to define the product cavity, and the product cavity is injected and filled with liquid cold-setting resin. After the resin has hardened, the mold is opened, the molded product is taken out, burrs are removed from the molded product, and the molded product is colored and painted. However, this conventional manufacturing method requires the use of expensive metal molds and resin molds, which increases product production costs.Moreover, it is necessary to prevent the liquid resin in the product cavity from leaking from the mating surfaces of the molds. There were problems such as the need for a clamping device that clamps the mold with a large force.

The present invention was made to solve the above problems, and its purpose is to have a molded product that can be molded using inexpensive wooden molds or plaster molds, has high strength, and does not require a clamping device for the mold. An object of the present invention is to provide a method for manufacturing a room temperature curable resin product. Hereinafter, embodiments of the present invention will be described in detail based on the drawings. First, the case where a product cavity is defined using a horizontally split mold consisting of an upper mold U and a lower mold W will be explained based on FIGS. 1 to 7.
Reference numeral 1 denotes a master mold in the form of a wooden mold or a plaster mold, in which a recess 2 having a shape substantially the same as a part of the outer shape of the cold-setting resin product is formed on the upper surface, and a hollow chamber 3 is provided in the lower part. Then, on the outside of the recess 2 on the upper surface of the master mold 1, a first V with a depth of 0.5 to 2.0 mm is formed in the shape of a closed curve and extends along the contour of the recess 2.
A second V-shaped groove 5 having a depth of 0.5 to 2.0 mm, which is located outside the first V-shaped groove 4 and has a closed curve shape and extends along the periphery of the master mold 1, is carved. It is set up. In addition, the recess 2 and the first and first
The upper surface of the master mold 1 including the surfaces of the 2V-shaped grooves 4 and 5 is communicated with a hollow chamber 3 via suction holes 6 and 6, and the hollow chamber 3 is communicated with a vacuum pump (not shown) via a ventilation pipe 7. It is connected. Reference numerals 8 and 9 are cylindrical holders that hold a resin injection tube 15 and a communication tube 16, which will be described later, and the resin injection tube 15 and communication tube 16 can be inserted into these holders, respectively, even if the inner surface is covered with a molded film 10, which will be described later. It has a large inner diameter. 10 is a flexible but non-permeable molded film made of synthetic resin such as polyethylene, polypropylene, polystyrene, vinyl chloride, vinylidene chloride, polyamide, polycarbonate, ionomer, polyvinyl alcohol, ethylene-vinyl acetate copolymer, etc. There are those made from synthetic resins such as ethylene-vinyl acetate copolymer and styrene-butadiene copolymer. Reference numeral 11 denotes a frame, and air-permeable intake pipes 12, 12 are installed in the space of the frame 11. It is connected to a vacuum pump (not shown). 1
3 is a non-permeable shielding membrane, which can be made of plastic, rubber, metal, or paper. Particulate matter 14 includes inorganic particles such as metal powder, glass powder, sand, and other inorganic compound powders, and organic particles such as wood powder and plastic powder. The necessary properties of this particulate material 14 are that it has good filling properties, and furthermore, when the room-temperature curing resin generates heat during curing or needs to be heated to a certain extent during molding, it has sufficient resistance to these temperatures. It is to have heat resistance so as to obtain. Further, the particle size of the particulate matter 14 may be about 10 μm to 3 mm, but care must be taken because the smoothness of the surface of the molded product is affected by the particle size. If the particle size is small, the smoothness of the surface of the molded product and the transferability of fine uneven patterns will be improved, but the particulate matter 14 will be difficult to handle and will generate dust, which will worsen the environment.
On the other hand, the opposite phenomenon will occur with coarse particles, and generally particles with a diameter of about 50 to 600 μm are preferable.
Reference numeral 15 denotes a resin injection pipe for injecting liquid room-temperature hardening resin into the product cavity, and may be made of metal, plastic, glass, or the like. Reference numeral 16 denotes a communication pipe that communicates the inside of the product cavity with the atmosphere, and may be made of metal, plastic, glass, or the like. Reference numeral 17 denotes a resin curable at room temperature, such as polyurethane, unsaturated polyester, acrylic, epoxy, polyamide, etc. Synthetic rubbers such as silicone and polysulfide may be used instead of these resins.

Therefore, a method of manufacturing a room temperature curable resin product using a horizontally split mold will be described. The holders 8 and 9 are set at predetermined positions on the recess 2 of the master mold 1. In this case, when setting it on an inclined surface like the holder 9, it is fixed with a weak adhesive so that it can be separated from the recess 2 when released from the mold. Next, a vacuum pump (not shown) is operated to reduce the pressure in the hollow chamber 3 of the master mold 1 by suction, thereby applying suction to the upper surface of the master mold 1 including the surfaces of the recess 2 and the first and second V-shaped grooves 4 and 5. , followed by a molded film 10 made of thermoplastic synthetic resin softened by heating.
When the molded film 10 is placed on the upper surface of the master mold 1, the molded film 10 is attracted to the upper surface of the master mold 1 and the surfaces of the holders 8 and 9 while being stretched by suction. Next, after inserting the resin injection pipe 15 and the communication pipe 16 into the holders 8 and 9, respectively, the frame 11 is placed on the upper surface of the master mold 1 to which the molded film 10 has been adsorbed, and the frame 11 and the molded film 1 are
Particulate matter 14 is injected and filled into the space formed by the master mold 1 and the frame 11 while vibrating, and then the shielding film 13 is covered on the upper surfaces of the frame 11 and the particulate matter 14. to cover the upper end opening of the frame body 11. In this case, when the upper ends of the resin injection pipe 15 and the communication pipe 16 are penetrated through the shielding film 13,
The shielding film 13 is tightly attached to each outer surface of the resin injection tube 15 and the communication tube 16 (see FIG. 4). Next, by driving a vacuum pump (not shown), the space constituted by the frame 11, the molded film 10, and the shielding film 13 and containing the particulate matter 14 is suctioned and depressurized through the suction pipes 12, 12, and the particulate matter is removed. The substance 14 is solidified by the action of atmospheric pressure. Next, the master mold 1 is removed by stopping the drive of the vacuum pump (not shown).
The suction action to the upper surface is stopped to release the adsorption state of the molding film 10 to the upper surface of the master mold 1, and then the frame 11 that solidifies and holds the particulate matter 14 is separated from the master mold 1 and raised. Then, as shown in FIG. 2, an upper mold U for molding the room temperature curable resin into a molded product can be obtained. Next, as shown in FIGS. 6 and 7, the molded film 10 located on the lower end surfaces of the resin injection tube 15 and the communication tube 16 is removed by appropriate means such as cutting, to open their lower ends, and , two closed curved first and second V-shaped protrusions 1 formed by first and second V-shaped grooves 4 and 5.
On the formed film 10 surface surrounded by 8a and 18b,
A large number of ventilation holes 19, 19 are bored with a needle, a drill, or the like. In addition, the size of the ventilation holes 19, 19 is 0.2
~5.0mm is fine, but if it is too small, you will have to increase the number, and if it is too large, particulate matter 14 will be discharged and air will leak more, so 0.5~1.0mm
is optimal. Next, this upper mold U is placed on the upper surface of a separately formed lower mold W in a mold-aligned manner. In addition,
The lower mold W, which is molded separately, includes the injection pipe 15, the communication pipe 16, and the first and second V-shaped protrusions 1 of the upper mold U.
Although there is nothing corresponding to 8a and 18b, the other parts have the same structure as the upper mold U. That is, the particulate matter 34 is solidified and held in the space surrounded by the frame 31, the molded film 30, and the shielding film 33. As shown in FIG. 3, a product cavity 20 is defined in the upper and lower molds U and W that have been matched in this way, and at the same time, a first mold cavity 20 is defined.
The second V-shaped protrusions 18a and 18b closely contact the upper surface of the lower mold W, and an annular hollow chamber 21 is defined around the outer periphery of the product cavity 20. By the way, this hollow chamber 2
1 is suctioned through the ventilation holes 19 and the pressure is reduced, so a force equal to the cross-sectional area of the hollow chamber 21 multiplied by the atmospheric pressure acts on the upper mold U, and therefore,
The upper mold U is pressed by the lower mold W, the hollow chamber 21 is crushed, and the close contact between the upper mold U and the lower mold W causes the ventilation hole 1
It is strongly acted by the suction action from 9 and 19. Product cavity 2 defined in this way
When a liquid room-temperature curable resin 17 is injected into 0 through the resin injection pipe 15 under atmospheric pressure or pressurization,
The room-temperature curable resin 17 is filled into the product cavity 20 while discharging the air inside the product cavity 20 from the communication pipe 16. Room temperature curable resin 1
After the reaction curing in step 7, the drive of the vacuum pump (not shown) is stopped to stop the suction action on the frames 11 and 31, and then the shielding films 13 and 33 are removed and the frame 1 is removed.
Particulate matter 14, 34 is discharged from 1, 31,
Subsequently, when the frame 11 is separated from the frame 31 and lifted up, the molded product having the room temperature curable resin 17 cured and the molded films 10 and 30 attached to its surface can be taken out. From this molded product, molded film 10,3
A desired cold-curable resin product can be obtained by peeling off the resin and removing unnecessary items such as the holders 8 and 9, the resin injection tube 15 and the communication tube 16.

In addition, if a color or an uneven pattern is required on the surface of the molded product, the molded films 10 and 30 should be colored or have an uneven pattern.
0.30, remove the excess portion and leave it attached to the molded product. Alternatively, a fibrous reinforcing material formed by forming fibers such as glass fiber or carbon fiber into a cross or mat shape may be charged into the product cavity 20 in advance and the room temperature curing resin 16 may be injected into the product cavity 20, or the fibrous reinforcing material may be injected into the product cavity 20. It may be cut into short pieces and mixed into the room temperature curing resin 16 in advance. Furthermore, in place of the intake pipes 12, 32, the frames 11, 31 have small holes in which a permeable material such as a wire mesh is stretched in the wall member of a hollow chamber (not shown) formed in the frames 11, 31. A hollow chamber may be provided with a ventilated wall member, such as provided. In addition, the first and second V-shaped protrusions 18a and 18b, the ventilation hole 19
Each of these may be provided in either one of the upper mold U and the lower mold W. Furthermore, the protrusions 18a, 1
The same effect can be obtained even if 8b is formed to have a semicircular or U-shaped cross section.

Next, the case of manufacturing a room temperature curable resin product using a vertically split type mold will be explained based on FIGS. 8 to 10. 61 is a forming film 10 and a shielding film 13
This is a mold holding member that solidifies and holds the particulate matter 14, and has the shape of a box cut in half.
A hollow chamber 62 is formed in the side wall and the bottom wall of the mold holding member 61, and each inner surface of the side wall of the mold holding member 61 has a large number of holes through which only air can pass by extending a wire mesh 63. It communicates with the hollow chamber 62 through the small holes 64, 64. In addition, the mold holding member 6
A flexible but non-ventilated diaphragm 65 is attached to the inner surface of the back wall of the mold holding member 6.
A chamber 6 defined by the back wall of 1 and a diaphragm 65
1a is a plurality of communication holes 67, 67 bored in the back wall.
It is communicated with the atmosphere through.

Therefore, to explain a method of manufacturing a room temperature curable resin product using a vertically split type mold, first, one side of the vertically split type mold is molded. That is, the molded film 10 is adsorbed onto the surface of a master mold (not shown) having the same structure and function as the master mold 1 in the same manner as in the embodiment described above, and then the mold holding member 61 is brought into contact with the molded film 10. , the space formed by the mold holding member 61 and the diaphragm 65 is filled with particulate matter 14, and then the upper surface of the mold holding member 61 and the particulate matter 14 is covered with the shielding film 13, and the upper end opening of the mold holding member 61 is closed. shield the area, then
The mold holding member 61 is driven by a vacuum pump (not shown).
After vacuuming and reducing the pressure in the space containing the particulate matter 14, which solidifies the particulate matter 14, the particulate matter 14 is transferred to the surface of the master mold (not shown) of the molded film 10 by stopping the drive of a vacuum pump (not shown). When the adsorption state of is released and the master mold is separated,
One half of the mold for molding a room-temperature curable resin product having the surface shown in FIG. 8 can be obtained. Next, ventilation holes 6 are formed in the surface of the molded film 10 surrounded by the V-shaped projections 68 formed on the outside of the product cavity portion 66.
9 and 69, and then, when this mold is fitted to a separately molded mold for manufacturing cold-curing resin products and brought into contact with each other, hollow chambers are also formed on the mating surfaces of these molds. (not shown) is defined, and a force equal to the vertical cross-sectional area of this hollow multiplied by atmospheric pressure also acts on the mold holding member 61, thereby clamping the mold holding members 61, 61. Next, the liquid room temperature curable resin 17 is injected through the resin injection port 70 under atmospheric pressure or pressurization, and thereafter the same steps as described above are performed to obtain a desired room temperature curable resin product.

Note that the V-shaped protrusion 68 of the mold in this embodiment does not completely surround the product cavity 66 and is formed into an endless double wall; Letter-shaped protrusion 1
This has the same effect as 8a and 18b.
Further, each of the V-shaped protrusion 68 and the ventilation hole 69 may be molded into one of two corresponding molds.

As is clear from the above description, according to the present invention, a mold can be accurately formed using an inexpensive wooden mold or plaster mold without using an expensive metal mold or resin mold.
Moreover, the molds can be brought into contact with each other with great force to prevent the resin from leaking in the product cavity without using a special clamping device.
It has excellent effects such as easy coloring and patterning of products.

[Brief explanation of drawings]

1 to 3 are longitudinal cross-sectional views of main parts of the first embodiment of the present invention, FIG. 4 is an enlarged view of section A in FIG. 1, FIG. 5 is an enlarged view of section B in FIG. 1, and FIG. The figure is an enlarged view of section C in FIG. 3, FIG. 7 is an enlarged view of section D in FIG. 3, FIG. 8 is a front view of the main parts of the second embodiment, and FIG.
E sectional view and FIG. 10 are FF sectional views of FIG. 8. 1: master mold, 2: recess, 4, 5: V-shaped groove, 10: molded film, 11: frame, 12: intake pipe,
13: Shielding film, 14: Particulate matter, 17: Room temperature curable resin, 18a, 18b: V-shaped groove, 19: Communication hole, 20: Product cavity, 21: Hollow chamber, 3
0: Molded film, 31: Frame, 33: Shielding film, 61:
Mold holding member, 64: Small hole, 68: V-shaped groove, 6
9: Ventilation hole.

Claims (1)

[Claims] 1. After adsorbing the molding film to the surface of a master mold on which grooves are carved to form an area surrounding the mold part, a frame body or a mold holding member equipped with an air intake means is brought into contact with the surface of the master mold to fill the space. After filling the space with particulate matter, a shielding film is placed over the frame or mold holding member and the particulate matter to shield the upper end opening of the frame or mold holding member, and the space is filled with particulate matter. solidifying the particulate matter by suctioning and depressurizing the space configured by the frame or the mold holding member, the molding film, and the shielding film and containing the particulate matter through the suction means;
After the adsorption state of the molding film to the surface of the master mold is released, the frame body or the mold holding member is separated from the master mold to mold a mold, and a mold is formed at a position corresponding to the area in the molding film or separately molded. A large number of communication holes are bored at positions corresponding to the areas in another mold, and this mold is matched with the other separately molded mold and abutted against each other to define a product cavity. A method for manufacturing a room temperature curable resin product, comprising: injecting a liquid room temperature curable resin into a cavity of the product.