JPH0428770B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Purpose of the invention (1) Industrial field of application The present invention relates to a rubber press molding method for reinforcing cylindrical fiber molded bodies used when reinforcing metal members etc. with fibers, in particular, A cylindrical support body to which a molded material made of reinforcing fibers and an inorganic binder is adhered to its outer peripheral surface is installed in a rubber cylinder, and the molded material is pressed against the support body through the rubber cylinder to form fibers. The present invention relates to a molding method and a rubber press molding apparatus for molding a fiber body and determining the fiber volume fraction of the fiber molded body.

(2) Prior Art Conventionally, in this type of molding method, gas pressure such as air or hydraulic pressure is applied to a pressurizing chamber surrounding a rubber cylinder when pressing a molded body material.

(3) Problems to be Solved by the Invention However, the volume of gases, oils, etc. changes significantly depending on temperature, and as a result, the gas pressure and oil pressure acting on the rubber tube become unstable, resulting in changes in the shape and fiber volume ratio of the fiber molded product. In addition, when using hydraulic pressure, the rubber cylinder is corroded by the oil, so
There is a problem that its durability is impaired and its service life is short.

An object of the present invention is to provide the rubber press molding method and rubber press molding apparatus that can solve the above problems.

B. Structure of the Invention (1) Means for Solving the Problems The present invention provides a cylindrical support body with a molded body material made of reinforcing fibers and an inorganic binder adhered to the outer peripheral surface thereof, which is installed inside a rubber cylinder. In a rubber press molding method in which a fiber molded body is formed by pressing the molded body material against the support body through the rubber tube and the fiber volume percentage of the fiber molded body is determined, when the molded body material is pressed, the In the pressurized chamber surrounding the rubber tube,
The method is characterized in that a volume of water corresponding to the target fiber volume ratio is supplied.

Further, the rubber press molding apparatus for reinforcing cylindrical fiber molded bodies according to the present invention includes a rubber cylinder having a cylindrical support body to which a molded body material made of reinforcing fibers and an inorganic binder is attached to the outer peripheral surface. disposed within the container to define a pressurized chamber between the inner circumferential surface of the pressure-resistant container and the outer circumferential surface of the rubber cylinder, and to press the molded resistant material against the support body via the rubber cylinder; A water pump for supplying water to the pressurizing chamber is connected to the body pressure container, and the water pump is configured to supply water in a volume corresponding to a target fiber volume ratio of the fiber molded article to the pressurizing chamber. The pump is characterized by comprising a control means for controlling the pump.

(2) Effects According to the rubber press molding method, the fiber volume fraction of the fiber molded product is determined by the volume of water supplied to the pressurizing chamber, so the volume change of water due to temperature is small, and fiber molding is possible. Variations in body shape and fiber volume fraction can be suppressed. Furthermore, since the pressure medium is water, the durability of the rubber tube can be improved and its lifespan can be extended.

According to the rubber press molding apparatus, the molding method can be carried out easily and stably.

(3) Example Figure 1 shows a reinforcing cylindrical fiber molded body 1, and the fiber molded body 1 has a length of 50 to 50 mm as a reinforcing fiber.
It is made by partially bonding 500 μm alumina-silica fibers with alumina sol as an inorganic binder, and has countless voids into which the matrix can penetrate.

This fiber molded body 1 is used, for example, in order to obtain a fiber-reinforced composite cylinder sleeve by combining it with an aluminum alloy matrix when casting an aluminum alloy cylinder block.

Next, a method for manufacturing the fiber molded body 1 will be explained with reference to FIG.

As shown in Figure 2a, shell sand (grain size
A mold 2 as a cylindrical support having air permeability is formed using AFS35). Since the mold 2 is made of shell sand, it has the property of collapsing when heated to a high temperature of 350 to 400°C.

As shown in FIG. 2b, holders 3 ₁ and 3 ₂ are attached to the openings at both ends of the mold 2 by bonding, bolting, etc., and the openings are sealed.

As shown in FIG. 2c, the mold 2 is immersed in an aqueous solution 4 of a molding material containing alumina-silica fibers and alumina sol, and a vacuum pump 5 applies suction into the mold 2 through the suction hole _3a of the holder 31. The molding material is applied to the outer peripheral surface of the mold 2 to a predetermined thickness to form a molded body material 6.

As shown in FIG. 2d, the mold 2 is placed in a pressure-resistant container 7 of a rubber press molding apparatus R to be described later, and the molded body material 6 is pressed against the outer peripheral surface of the mold 2, whereby the fiber molded body 1 As soon as the molding is completed, the fiber volume fraction is determined.

As shown in FIG. 2e, both holders 3 ₁ and 3 ₂ are removed from the mold 2.

As shown in FIG. 2f, the mold 2 is placed in a drying oven 8, and the fiber molded body 1 is subjected to a drying process at 120° C. for 1 hour to evaporate and remove moisture.

As shown in FIG. 2g, the mold 2 is placed in a firing furnace 9, and the mold 2 is subjected to a disintegration treatment at 350 to 400° C. for 1 hour. This collapse process completely collapses the mold 2.

As shown in FIG.
The alumina-silica fibers are partially bonded to each other by the alumina sol.

FIG. 3 shows the rubber press molding apparatus R and the molding process of the fiber molded body 1.

The pressure container 7 of the rubber press device R includes a cylindrical body 10 having an inner circumferential surface having a concave arc shape in cross section;
It has a bottom plate 11 attached to the cylindrical body 10 in order to close the lower opening of the cylindrical body 10, and a cover plate 12 which is detachably attached to the upper opening of the cylindrical body 10. Rubber tube 1 inside pressure container 7
3 is arranged, the lower end bead part 13a is sandwiched between the cylinder 10 and the bottom plate 11, and the upper end bead part 13b is sandwiched between the cylinder 10 and the annular presser plate 14.
caught in between. Thereby, a pressurizing chamber A is defined between the outer circumferential surface of the rubber cylinder 13 and the inner circumferential surface of the cylinder body 10.

The communication hole 10a formed in the cylinder 10 is connected to the pipe 15.
₁ to the water pump 16 and also the bottom plate 1
An intake hole 11a formed in the rubber cylinder 13 and communicating with the inside of the rubber cylinder 13 is connected to a vacuum pump 17. 12a is a ventilation hole formed in the cover plate 12, which communicates the inside of the rubber cylinder 13 with the atmosphere.

The water pump 16 has a piston 18 slidably fitted into a cylindrical body 16a, and a water storage chamber communicating with the pressurizing chamber A is provided between the piston 18 and one end plate 16b of the cylindrical body 16a. B is defined.

A hydraulic cylinder 19 for operating the water pump 16 is disposed in the vicinity of the water pump 16, and a piston 21 that is slidably fitted into the cylinder body 20 of the hydraulic cylinder 19 is connected to the hydraulic cylinder 19 located on the side of the water pump 16. 1 hydraulic chamber C ₁ and a 2nd hydraulic chamber C ₂ on the opposite side
It is divided into The pistons 18 and 21 of the water pump 16 and the hydraulic cylinder 19 are connected to the piston rod 2.
Connected by 2.

The first and second hydraulic chambers C ₁ and C ₂ are connected to piping 15 ₂ ,
One of the two pipes 15 _{4 and} 15 5 connected to the switching valve 23 via the switching valve 23 and extending from the switching valve 23, one _{15 4 is} connected directly to the oil tank 24, and the other 1
5 ₅ is an oil pump 25 that operates the hydraulic cylinder 19
The oil tank 24 is connected to the oil tank 24 through the respective oil tanks. In one pipe 15 ₅ , the discharge side of the oil pump 25 and the oil tank 24 are connected to the pipe 1 having a relief valve 26 .
Connected by 5 ₆ .

An operator 27 is attached to the intermediate portion of the piston rod 22, and first and second limit switches S ₁ and S ₂ whose actuators protrude in the movement path of the operator 27 move the first limit switch S ₁ to the water pump 16. They are placed on the sides at predetermined intervals.

When the operating element 27 is moved via the hydraulic cylinder 19 by the drive of the oil pump 25 from the contact position with the second limit switch _S2 , indicated by the chain line, to the contact position with the first limit switch _S1 , indicated by the solid line, the first limit switch
The drive of the oil pump 25 is stopped by a limit switch _S1 .

The movement of the operator 27 in this manner
Since this is the process of supplying water to the pressurizing chamber A to reduce the volume of the water storage chamber B, the volume of water supplied to the pressurizing chamber A changes depending on the position of the first limit switch _S1 . .

On the other hand, in the pressurizing chamber A, the molded body material 6 is pressed against the mold 2 through the rubber tube 13 by the water supplied there, so that the volume of water in the pressurizing chamber A causes the fibers to be The fiber volume fraction of the molded body 1 is determined.

Therefore, the operator 27 and the first limit switch _S1 operate the water pump 19 so as to supply water in a volume corresponding to the target fiber volume ratio to the pressurizing chamber A.
This constitutes a control means for controlling.

In addition, the hydraulic cylinder 1 is driven by the oil pump 25.
9, when the operator 27 moves from the contact position with the first limit switch _S1 , indicated by the solid line, to the contact position with the second limit switch _S2 , indicated by the chain line, the second limit switch _S2 controls the oil pump 25. The drive is now stopped.

The movement of the operator 27 in this manner
Since this is the process of discharging water from the pressurizing chamber A to expand the volume of the water storage chamber B, the volume of water discharged from the pressurizing chamber A changes depending on the position of the second limit switch _S2 . In this embodiment, by selecting the placement position of the second limit switch _S2 , the water in the pressurizing chamber A is reduced to almost zero, and the rubber cylinder 13 is suctioned and adhered to the inner peripheral surface of the cylinder body 10. There is.

Although the electric circuit including the first and second limit switches S ₁ , S ₂ , the oil pump 25, etc. is omitted in the figure, the electric circuit includes the operator 27 that connects the first and second limit switches S ₁ , S _{2 , etc.} The oil pump 25 is configured to be able to be driven again even when the oil pump 25 is in contact with the oil pump 25.

The rubber cylinder 13 is formed to have a diameter smaller than that of the mold 2 in its free state, and therefore, the upper and lower end bead portions 13b and 13a of the rubber cylinder 13 are attached to the cylinder body 10 in an enlarged diameter state. It is being

Fiber molded product 1 produced by the rubber press molding device
The molding operation is carried out as follows.

Before work, the operator 27 is in the first limit switch _S1 position as shown in FIG. 3a,
When water is being supplied to the pressurizing chamber A, the switching valve 23 communicates the oil pump 25 with the first hydraulic chamber C ₁ of the hydraulic cylinder 19 and communicates the second hydraulic chamber C ₂ with the oil tank 24 . Then, the oil pump 25 is driven to supply oil to the first hydraulic chamber _C1 . As a result, the piston 21 of the hydraulic cylinder 19 slides to reduce the volume of the second hydraulic chamber _C2 , and the piston 18 of the water pump 16 slides to expand the water storage chamber B, causing the pressurizing chamber Water A is returned to the water pump 16, and when the operator 27 contacts the second limit switch _S2 , the oil pump 25 stops driving.

In this state, the water in the pressurizing chamber A has been discharged as shown in FIG.
is sucked radially outward and adheres to the inner circumferential surface of the cylinder 10, so that the rubber cylinder 13 has expanded to a larger diameter than the mold 2.

Remove the lid plate 12 and remove the mold 2 holding the molded body material 6
Stand the holder 3 ₁ on the bottom plate 11 with the holder 3 1 facing down, install it inside the rubber tube 13 , close the lid plate 12 again, and sandwich the mold 2 between it and the bottom plate 11 via the holders 3 ₁ and 3 ₂ . do. At that time, the intake hole _3a of the holder 31
is aligned with the intake hole 11a of the bottom plate 11.

As shown in FIG. 3c, the vacuum pump 17 is activated to apply suction to the mold 2, and the switching valve
3 communicates the oil pump 25 with the second hydraulic chamber C ₂ and communicates the first hydraulic chamber C ₁ with the oil tank 24 . Next, the oil pump 25 is driven to supply oil to the second hydraulic chamber _C2 . As a result, the piston 21 of the hydraulic cylinder 19 slides to reduce the volume of the first hydraulic chamber _C1 , so the piston 18 of the water pump 16 slides to reduce the water storage chamber B to accommodate the water therein. Water from chamber B is supplied to pressurizing chamber A, and when the operator 27 comes into contact with the first limit switch _S1 , the oil pump 25 stops driving.

The molded body material 6 is pressed against the mold 2 through the rubber cylinder 13 by water supplied to the pressurizing chamber A, so that the fiber molded body 1 is molded and its fiber volume fraction is determined. This fiber volume ratio corresponds to the volume of water supplied to the pressurizing chamber A.

If the fiber volume fraction of the fiber molded body 1 is determined based on the volume of water supplied to the pressurizing chamber A in this way, the shape of the fiber molded body 1 and the fiber volume fraction can be determined partly because the volume change of water due to temperature is small. Variations can be suppressed. Furthermore, since the pressure medium is water, the durability of the rubber tube 13 can be improved and its lifespan can be extended.

Further, since the molded fiber body 1 is formed while reducing the diameter of the rubber cylinder 13, wrinkles do not occur in the rubber cylinder 13, and therefore the outer peripheral surface of the molded fiber body 1 becomes smooth.

After molding, with the vacuum pump 17 in operation, the water in the pressurizing chamber A is discharged as shown in FIG. Attach it to the surface.

When the rubber tube 13 is separated from the fiber molded body 1, the fiber molded body 1 is attracted to the mold 2 and adheres thereto, so that some of the alumina-silica fibers and alumina sol on the outer periphery of the fiber molded body 1 are removed. will not adhere to the rubber cylinder 13 and be taken away, and even if the fiber molded body 1 is thin, a part of it will not peel off from the mold 2 and be taken away by the rubber cylinder 13. As a result, a healthy fiber molded body 1
can be obtained.

Figure 4 shows molded body material 6 with an inner diameter of 80 mm and an outer diameter of
The relationship between the volume of water in the pressurizing chamber A and the fiber volume fraction of the fiber molded body 1 is shown when a fiber molded body 1 having a length of 84 mm, a length of 150 mm, and a fiber volume fraction of 6 to 7% is used.

For example, when obtaining a fiber molded body 1 with a fiber volume ratio of 10%, the volume of water in the pressurizing chamber A is set to 85.3 cm ³ . The volume of water corresponding to a fiber volume ratio of 10% is calculated as follows:
81 cm ³ , but the spring back after molding is 5%.
Since there is a certain amount, take this into account and set the volume of water as described above. In this case, the molding pressure acting on the molded body material 6 is 6 to 8 kg/cm ² .

Furthermore, when the fiber volume percentage of the fiber molded body 1 is set to 20%, the corresponding volume of water is 220.6 cm ³
The molding pressure at this time is 16 to 19 kg/cm ² .

Figure 5 shows a conventional example in which gas is used as the pressure medium for the rubber tube. For example, when a fiber molded article is molded with the gas pressure set at 18 kg/cm ² , the fiber volume fraction is 19 to 23 The variation is shown in the range of %.

C. Effects of the Invention According to the rubber press molding method according to the present invention, the fiber volume fraction of the fiber molded body is determined by the volume of water supplied to the pressurizing chamber, so the volume change of water due to temperature may be small. This makes it possible to suppress variations in the shape and fiber volume fraction of the fiber molded body.
Furthermore, since it is a pressure medium, it is possible to improve the durability of the rubber cylinder and extend its life.

According to the rubber press molding apparatus, the molding method can be carried out easily and stably.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a fiber molded product, Fig. 2 is an explanatory diagram of the manufacturing process of the fiber molded product, Fig. 3 is an explanatory diagram of the rubber press molding device and the molding process of the fiber molded product, and Fig. 4 is an explanatory diagram of the molding process of the fiber molded product.
The figure is a graph showing the relationship between water volume and fiber volume percentage, and FIG. 5 is a graph showing the relationship between gas pressure and fiber volume percentage. A...pressure chamber, R...rubber press molding device,
S ₁ ... first limit switch constituting the molding means, 1 ... fiber molded object, 2 ... mold as a cylindrical support, 6 ... molded object material, 7 ... pressure-resistant container,
13...Rubber tube, 16...Water pump, 27...
An operator that constitutes a control means.

Claims (1)

[Scope of Claims] 1. A cylindrical support having a molded material made of reinforcing fibers and an inorganic binder adhered to its outer peripheral surface is installed in a rubber cylinder, and the molded material is passed through the rubber cylinder to the support. In the rubber press molding method in which a fiber molded body is formed by pressing the fiber molded body and the fiber volume percentage of the fiber molded body is determined, when the molded body material is pressed, a target and A rubber press molding method for a reinforcing cylindrical fiber molded article, characterized in that water is supplied in a volume corresponding to the fiber volume ratio. 2. A rubber cylinder having a cylindrical support to which a molded material made of reinforcing fibers and an inorganic binder is attached to the outer peripheral surface is disposed in a pressure-resistant container, and the inner peripheral surface of the pressure-resistant container and the outer periphery of the rubber cylinder are arranged. A water pump for supplying water to the pressurizing chamber is connected to the pressure vessel in order to define a pressurizing chamber between the pressurizing chamber and the pressurizing chamber, and to press the molded body material against the support body through the rubber tube. , a reinforcing tube comprising a control means for controlling the water pump so as to supply water in a volume corresponding to a target fiber volume ratio of the fiber molded body to the pressurizing chamber. Rubber press molding equipment for shaped fiber molded bodies.