JPS62170600A - Production of cylindrical fiber molded body for reinforcement - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION A0 OBJECTS OF THE INVENTION (1) Industrial Field of Use The present invention relates to a method for manufacturing a reinforcing cylindrical fiber molded body used when reinforcing metal members or the like with fibers.

(2) Conventional technology Conventionally, this type of fiber molded article was produced by sealing the openings at both ends of a cylindrical mold with air permeability, and immersing the mold in an aqueous solution of a molding material containing reinforcing fibers and an inorganic binder. , a process of applying a suction action within the mold to make the molding material adhere to the outer peripheral surface of the mold to form a molded body material, a process of pressing the molded body material against the mold to adjust the shape of the molded body material , a process of opening both end openings of the mold and pulling the mold from the molded body material, a process of heating and drying the molded body material, and a process of firing the molded body material and partially bonding the reinforcing fibers with an inorganic binder. Manufactured through a process.

(3) Problems that the invention seeks to solve However,
As mentioned above, if the mold is pulled out from the molded body material before the molded body material is heated and dried, the molded body material will be deformed because the molded body contains a large amount of moisture and has poor shape retention. There is a problem in that the dimensional accuracy of the fiber molded body deteriorates.

An object of the present invention is to provide the manufacturing method capable of solving the above problems.

B1 Structure of the Invention (1) Means for Solving Problems The present invention consists of a cylindrical mold with a thin wall and air permeability so as to be completely disintegrated under high-temperature heating, and a rigid mold with a large number of ventilation holes in the peripheral wall. The mold and the hollow core are fitted with a hollow core having a diameter of 1.1 cm, and the openings at both ends of the mold and the hollow core are tightly sealed, and the mold and the hollow core are immersed in an aqueous solution of a molding material containing reinforcing fibers and an inorganic binder; forming a molded body material by applying a suction action within the hollow core to cause the molding material to adhere to the outer peripheral surface of the mold; pressing the molded body material against the mold; adjusting the shape of the mold; pulling out the hollow core from the mold; heating and drying the molded body material at a temperature lower than the collapse temperature of the mold; heating the mold to a temperature higher than the collapse temperature. The method is characterized by using the steps of: completely collapsing the molded body; and firing the molded body material and partially binding the reinforcing fibers with the inorganic binder.

(2) Function Since the mold is thin, the special molding material for molding the molded body material can be efficiently sucked, and the molding operation can be performed quickly.

Since a rigid hollow core is fitted into the mold, even if the mold is thin, it can be prevented from breaking during the molding and shaping process of the molded material.

After the hollow core is pulled out from the mold, the molded body material is heated and dried, so the mold is destroyed due to thermal expansion of the hollow core.
Moreover, the molded body material is not deformed. In this case, since the hollow core is pulled out from the mold and not from the molded body material, the shape of the molded body material is not changed when the hollow core is pulled out.

Since the mold is completely disintegrated by heating to a high temperature, the mold can be easily removed without deforming the molded body material, and the step of pulling out the mold can be omitted.

(3) Example Figure 1 shows a reinforcing cylindrical fiber molded article 1 obtained according to the present invention.
The fiber molded body 1 is made by partially bonding mixed short fibers of carbon fiber and alumina fiber as reinforcing fibers with silica sol, alumina sol, or a mixed sol thereof as an inorganic binder, and the matrix is It has countless voids that can be penetrated.

This fiber molded body 1 is used, for example, in order to obtain a fiber-reinforced composite cylinder sleeve by combining 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 2 (al), shell sand (grain size AFS35
) is used to form a cylindrical mold 2 having air permeability.

The mold 2 has an outer diameter of 75 mm, a thickness of about 2.5 mm, and a radial crushing strength of 40 kg/c+d. In addition, since the mold 2 is made of shell sand and has a thin wall,
It has the property of completely disintegrating when heated to a high temperature of 400°C.

As shown in Fig. 2 ([)], a hollow core CO having a plurality of annular grooves G opening on the outer surface of the circumferential wall and a large number of ventilation holes opening on the bottom surface of each annular groove G and the inner surface of the circumferential wall, respectively, is made of an aluminum alloy. Form more. This allows the hollow core CO
has rigidity. Further, the outer peripheral surface of the hollow core Co is provided with a draft angle of approximately 30 minutes.

As shown in FIG. 2 (C1), the hollow core Co is fitted into the mold 2.

FIG. 2 (As shown in (1), holders 38 and 3□ are glued to the openings at both ends of the mold 2 and the hollow core CO, respectively.
Attach with bolts, etc., and seal the openings.

As shown in Figure 2 (el), an aqueous solution 4 of a molding material containing mixed fibers of carbon fibers and alumina fibers and alumina sol.
The mold 2 and the hollow core CO are immersed in water, and the vacuum pump 5 applies suction to the inside of the hollow core Co to adhere the molding material to the outer peripheral surface of the mold 2 to a predetermined thickness. to form. In this case, since the mold 2 has a thin wall, the molding material can be suctioned efficiently, and the molding operation by the vacuum pump 5 only takes about one minute.

FIG. 2 (As shown in [1], the mold 2 and the hollow core C
O is placed in a pressure container 7 of a rubber press, pressurized air is supplied from an air pressure source 8 into the pressure container 7, and the molded body material 6 is applied to the outer peripheral surface of the mold 2 through the rubber 9 at a rate of lQkg/cI11. Pressing is applied with pressure, thereby adjusting the shape of the molded body material 6 and determining the density at the same time.

11" In the molding and shaping process of the molded body material 6,
Since the thin mold 2 is reinforced by the hollow core CO, it will not break.

As shown in Fig. 2 tg+, the mold 2 and the hollow core C
Remove both holders 31, 3□ from O.

As shown in FIG. 2fhl, the hollow core CO is pulled out from the mold 2. In this case, the hollow core CO is easily pulled out using the draft angle, and since no equivalent force is applied to the molded body material 6, the molded body material 6 is not deformed.

As shown in FIG. 2(1), the mold 2 is placed in a drying oven IO, and the molded body material 6 is subjected to a drying process at 120° C. for 1 hour to completely remove moisture.

As shown in FIG. 2(J), the mold 2 is placed in the firing furnace 11, and the mold 2 is subjected to a disintegration treatment at 350 to 400° C. for 1 hour. Due to this disintegration process, the mold 2 is completely disintegrated since it is thin.

Subsequently, the molded body material 6 is subjected to a firing treatment at 800°C for 1 hour. As a result, the mixed fibers are partially bonded by the alumina sol, and the fiber molded body 1 shown in FIG. 1 is obtained.

Note: 1. The hollow core can be omitted if the mold 2 is made thick (for example, 5I) so that the mold 2 has enough radial crushing strength to withstand the molding and shaping process. If the mold 2 is made thick in this way, the suction efficiency of the molding material will be reduced, the molding operation time for the molded body material will be longer, the amount of molding material will increase, and the mold will not be completely removed during the disintegration process. unable to collapse.

C0 Effects of the Invention According to the present invention, since the mold is formed with a thin wall, the special molding material for forming the molded body material can be efficiently sucked, and the molding operation can be performed quickly.

Furthermore, since a rigid hollow core is fitted into the mold, even if the mold is thin, it can be prevented from breaking during the molding and shaping process of the molded body material.

Furthermore, since the molded body material is heated and dried after the hollow core is pulled out of the mold, the mold will not be destroyed or the molded body material will not be deformed due to thermal expansion of the hollow core. In this case, since the hollow core is pulled out from the mold and not from the molded body material, the shape of the molded body material is not changed when the hollow core is pulled out.

Furthermore, the mold is heated to a high temperature and completely collapses, so
The mold can be easily removed without deforming the molded body material, and the step of pulling out the mold can be omitted.

Therefore, according to the present invention, fiber molded articles with good dimensional accuracy can be produced efficiently and at low cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a fiber molded product, and FIG. 2 is an explanatory diagram of the manufacturing process of the fiber molded product. Co: hollow core, tr: ventilation hole, 1: fiber molded body, 2: mold, 4: aqueous solution, 5: vacuum pump, 6: molded body material, 8... Air pressure source, 10
... Drying oven, 11... Firing oven procedural amendment (voluntary) February 1988 288 1. Indication of the case 1986 Patent Application No. 11612 2. Name of the invention Tubular fiber molding for reinforcement 3. Relationship with the case of the person making the amendment Patent applicant name (532) Honda Motor Co., Ltd. 4.
Agent 105 Telephone Tokyo 434-4151 5 “Claims” and “Detailed Description of the Invention” of the specification subject to amendment
Contents of amendment in column 18 The description in the "Claims" column of the specification is corrected as follows. A rigid hollow core with numerous ventilation holes in the peripheral wall is fitted into a thin-walled, breathable cylindrical mold that can completely collapse under high-temperature heating, and both ends of the mold and the hollow core are opened. immersing the mold and hollow core in an aqueous solution of a molding material containing reinforcing fibers and an inorganic binder;
forming a molded body material by applying a suction action within the hollow core to cause the molding material to adhere to the outer peripheral surface of the mold; pressing the molded body material against the mold; adjusting the shape of the mold; pulling out the hollow core from the mold; heating and drying the molded body material at a temperature lower than the collapse temperature of the mold; heating the mold to a temperature higher than the collapse temperature. A reinforcing cylindrical fiber molding characterized by using: a step of completely collapsing the molded material; and a step of firing the molded body material and partially binding the reinforcing fibers with the inorganic binder. How the body is manufactured. 2. On page 5, line 9 of the specification, the word "body" is corrected to "type."that's all

Claims (1)

[Claims] A rigid hollow core with numerous ventilation holes in the peripheral wall is fitted into a thin-walled, breathable cylindrical mold that can completely collapse under high-temperature heating, and openings at both ends of the mold and the hollow core are formed. and immersing the mold and hollow core in an aqueous solution of a molding material containing reinforcing fibers and an inorganic binder;
forming a molded body material by applying a suction action within the hollow core to cause the molding material to adhere to the outer peripheral surface of the mold; pressing the molded body material against the mold; a step of adjusting the shape of the hollow core; a step of pulling out the hollow core from the mold; a step of heating and drying the molded body material at a temperature lower than the collapse temperature of the mold; and a step of heating the mold to a temperature higher than the collapse temperature. A reinforcing cylindrical fiber molding characterized by using: a step of completely collapsing the molded body; and a step of firing the molded body material and partially bonding the reinforcing fibers with the inorganic binder. How the body is manufactured.