JPH0219770B2 - - 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 room-temperature-setting resin products, a product cavity is defined by fitting molds, resin molds, or split molds of a mold molded into a frame, and a liquid room-temperature-curing resin is poured into the product cavity. After the resin is injected and filled and the resin is cured by reaction, the mold is opened to take out the molded product, and the molded product is deburred and colored. However, in this conventional manufacturing method, it is necessary to use expensive metal molds, resin molds, or frames as molds, which increases the production cost of the product.Moreover, the liquid resin in the product cavity leaks from the mating surface of the mold. There were problems such as the need for a clamping device to clamp the mold with great force to prevent leakage.

The present invention was made in order to solve the above problems, and its purpose is to use a cold-curing resin that can be molded using an inexpensive wooden mold or plaster mold, and that does not require a clamping device for the mold. Our goal is to provide a method for manufacturing products. Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Reference numeral 1 denotes a master mold made of wood or plaster, on the upper surface of which a mold part 2 having a shape almost identical to a part of the external shape of the cold-setting resin product is formed, and in the lower part a hollow mold part 2 that is connected to a vacuum pump (not shown). Room 3 is provided. On the outside of the mold part 2 on the upper surface of the master mold 1, there are two closed curved first and second V-shaped grooves 4 and 5 extending along the contour of the mold part 2.
are carved at appropriate intervals (see Figure 1). Further, the upper surface of the master mold 1, including the surfaces of the mold part 2 and the first and second V-shaped grooves 4 and 5, is communicated with the hollow chamber 3 through suction holes 6 and 6 (see FIG. 2). Further, a bulky part 7 having an appropriate height is integrally formed on the entire periphery of the upper surface of the master mold 1, and on the upper surface of the bulky part 7 there are notches 18, 18 in which an intake pipe mechanism 20, which will be described later, is set. ,19,
19 is formed. 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 polyethylene, polypropylene, polystyrene, vinyl chloride, vinylidene chloride, polyamide, polycarbonate,
Those made from synthetic resins such as ionomers, polyvinyl alcohol, and ethylene-vinyl acetate copolymers;
Some are made from synthetic resins such as styrene-butadiene copolymer. Reference numeral 13 denotes a non-breathable shielding membrane, which may 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 the particle size is 50~
Something around 600μ is good. 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. Reference numeral 20 denotes an intake pipe mechanism which is connected to a vacuum pump (not shown) through a flexible hose (not shown), and is configured as shown in FIG. 3. That is, two long tubes 21, 21 arranged at the same interval as the interval between the notches 19, 19 of the master mold 1.
Both ends of the two short tubes 22, 22 are connected to the long tube 2.
The long tubes 21, 21 and the short tubes 22, 22 have a large number of small holes 23, 23, 24, 24 transparent in their bodies. At the same time, wire meshes 25 and 26 are wrapped around the small hole 2.
3 and 24 are long tubes 2 through which only air can pass.
The ends of the tubes 1 and 21 are all airtightly closed except for the part communicating with the vacuum pump, and the long tubes 21 and 2
1 has a handle member 27 which is oriented outward and is spaced at the same distance as the notch portions 18, 18 of the master mold 1;
27 is fixed in place.

Next, a method for manufacturing a room temperature curable resin product will be described. The holders 8 and 9 are set at predetermined positions on the mold part 2 of the master mold 1. In this case, when it is set on an inclined surface like the holder 9, it is fixed with a weak adhesive so that it can be separated from the mold section 2 when it is released. Next, a vacuum pump (not shown) is activated to suck and reduce the pressure inside the hollow chamber 3 of the master mold 1, thereby removing the master mold 1 including the surface of the mold part 2.
When suction is applied to the upper surface and the molded film 10 made of a thermoplastic synthetic resin softened by heating is then placed on the upper surface of the master mold 1, the molded film 10 is suctioned and stretched and covers the upper surface of the master mold 1 and the holders 8, 9. adsorbed to the surface. Next, the long pipe 21 and handle members 27, 27 of the intake pipe mechanism 20 are inserted into the notches 19, 19, 18, 18 of the master mold 1, respectively, and the intake pipe mechanism 20 is placed inside the hollow part 7 of the master mold 1. After setting, particulate matter 14 is injected and filled into the hollow part 7 while vibrating the master mold 1, and then a shielding film 13 is covered on the upper surface of the hollow part 7 and the particulate matter 14, and the upper end of the hollow part 7 is filled. Cover openings. In this case, the resin injection pipe 15 and the communication pipe 16
When the upper ends of the shielding film 13 are penetrated, the shielding film 1
3 is closely attached to each outer surface of the resin injection tube 15 and the communication tube 16 (see FIG. 6). Next, a vacuum pump (not shown) is driven to move the inside of the forming film 10 and shielding film 13 surrounding the particulate matter 14 into the intake pipe mechanism 2.
When the pressure is reduced by suction through 0, the particulate matter 14
is solidified by the action of atmospheric pressure. Then,
By stopping the drive of the vacuum pump (not shown), the suction action to the upper surface of the master mold 1 is stopped, the adsorption state of the molded film 10 to the upper surface of the master mold 1 is released, and then the intake pipe mechanism 20 is separated from the bracket part 7. An upper mold U for manufacturing a room temperature curable product is formed by raising the mold. Next, the molded film 10 located on the lower end surfaces of the resin injection pipe 15 and the communication pipe 16 is removed by appropriate means such as fusing to open their lower ends, and the first and second V-shaped grooves 4, 5 formed by two closed curved first and second V-shaped protrusions 51, 5.
A large number of ventilation holes 53, 53 are bored in the surface of the molded film 10 surrounded by 2 using a needle, a drill, or the like. In addition,
The size of the ventilation holes 53, 53 may be 0.2 to 5.0 mm; if it is too small, the number of ventilation holes 53, 53 must be increased, and if it is too large, particulate matter 14 may be discharged or air may leak. 0.5 to 1.0 as it increases
A range of mm is optimal. Next, as shown in FIG. 8, this upper mold U is placed on the upper surface of a separately molded lower mold W in a mold-aligned manner. Note that the separately molded lower mold W includes the injection pipe 15 and the communication pipe 1 of the upper mold U.
There is nothing corresponding to 6, but the other structure is the same as that of the upper mold U. That is, the molded film 30
and the shielding film 33, and the intake mechanism 4
The particulate matter 34 is solidified and held in the space whose pressure is reduced by zero. As shown in FIG. 8, a product cavity is defined in the upper and lower molds U and W that are assembled in this way, and at the same time, the first and second V-shaped protrusions 51 and 52 are formed on the upper surface of the lower mold W. The close contact defines an annular hollow chamber 54 around the outer periphery of the product cavity. By the way, this hollow chamber 54
Since the inside is sucked through the ventilation holes 53 and the pressure is reduced, a force equal to the cross-sectional area of the hollow chamber 54 multiplied by the atmospheric pressure acts on the upper mold U, and therefore the upper mold U is lowered. The hollow chamber 54 is crushed by being pressed by the mold W,
Furthermore, the close contact between the upper mold U and the lower mold W is caused by the ventilation holes 53,
It is strongly acted by the suction action from 53. When the liquid room temperature curable resin 17 is injected into the product cavity thus defined through the resin injection pipe 15 under atmospheric pressure or under pressure, the room temperature curable resin 17 communicates with the air in the product cavity. tube 16
It fills the product cavity while being discharged from the tank. After the room temperature curing resin 17 is cured by reaction, the vacuum pump (not shown) is stopped to stop the suction action on the intake pipe mechanisms 20 and 40, and then the shielding film 1 is removed.
When parts 3 and 33 are removed, the particulate matter 9 and 29 fall, and a molded product and an intake pipe are formed by hardening the room-temperature curing resin 11 and adhering molded films 10 and 30 to the surface of the air intake pipe mechanism 40. The mechanism 20 remains. Excess molded films 10 and 30 are peeled off from this molded product, and the holders 8 and 9, resin injection pipe 15, and communication pipe 1 are removed.
By removing unnecessary substances such as No. 6, a desired cold-curing resin product can be obtained.

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. In addition, 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 in advance and the room temperature curing resin 17 may be injected, or the fibrous reinforcing material may be cut. Alternatively, the resin may be mixed into the room-temperature curable resin 17 in advance. Furthermore, first and second V-shaped protrusions 51, 52,
Each of the ventilation holes 53, 53 may be provided in either one of the upper mold U and the lower mold W. Furthermore, the same effect can be obtained even if the protrusions 51 and 52 are formed to have a semicircular or U-shaped cross section.

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, resin mold, or frame. 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, and furthermore, it has excellent features such as making it easy to color and pattern the product. be effective.

[Brief explanation of drawings]

FIG. 1 is a plan view of a master mold used in the implementation of the present invention, FIG. 2 is a sectional view taken from A to A in FIG. 1, and FIG. 3 is a plan view of the intake pipe mechanism used in the implementation of the present invention.
4 is a longitudinal sectional view of the explanatory diagram of the present invention, FIG. 5 is an enlarged view of section B in FIG. 4, FIG. 6 is an enlarged view of section C in FIG. 4, and FIG. 7 is an enlarged view of section D in FIG. 4. FIG. 8 is a longitudinal cross-sectional view of an explanatory view of the present invention. 1: master mold, 2: mold part, 4, 5: V-shaped groove, 7: bracket part, 10, 30: molding film, 13,
33: Shielding film, 14, 34: Particulate matter, 20,
40: Intake pipe mechanism.

Claims (1)

[Scope of Claims] 1. A molded film is adsorbed onto the upper surface of a master mold, which has a raised part surrounding the mold part and has a required height, and an intake pipe mechanism is set in the said raised part, and then the particulate form is A substance is filled, a shielding film is placed over the upper surface of the enclosure and the particulate matter to shield the upper end opening of the enclosure, and the space is configured by the forming film and the shielding film and contains the particulate matter. is sucked and depressurized through the intake pipe mechanism to solidify the particulate matter, and after releasing the adsorption state of the molded film to the surface of the master mold, the intake pipe mechanism is separated from the master mold and a resin injection port is attached. A mold is molded, the mold is fitted to another mold molded separately, and abuts each other to define a product cavity, and a room-temperature hardening liquid is poured into the product cavity through the resin injection port. 1. A method for producing a room-temperature curable resin product, which comprises injecting a thermosetting resin. 2. A molded film is adsorbed onto the upper surface of a master mold, which has a groove forming an area surrounding the mold part, and a bulky part extending to surround the groove at an appropriate interval and having a required height. , after setting the intake pipe mechanism inside the bulky part, filling it with particulate matter;
A shielding film is placed over the upper surface of the shielding part and the particulate matter to shield the upper end opening of the shielding part, and the space formed by the molding film and the shielding film and containing the particulate matter is guided through the intake pipe mechanism. After the particulate matter is solidified by suction and reduced pressure through a vacuum cleaner and the adsorption state of the molding film on the surface of the master mold is released, the intake pipe mechanism is separated from the master mold to form a mold with a resin injection port. , at a position corresponding to the area in the molding film or in the molding film of another molding mold molded separately, the molding mold is matched with another molding mold molded separately 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 the product cavity through the resin injection port.