JPH08170127A - Production of fiber reinforced metallic cylindrical body - Google Patents

Abstract

PURPOSE: To produce a fiber reinforced metallic cylindrical body which is large in diameter and thin by hot isostatic molding. CONSTITUTION: Plural layers of fiber reinforced metallic blanks 7 which consist of sheet-like preforms consisting of reinforcing fibers of a silicon carbide system and aluminum alloys and in which the orientation angles of the reinforcing fibers have an angle to reinforce an axial direction and an angle to reinforce a circumferential direction are tightly fitted and laminated by butting both marginal surfaces of the respective layers to the inside surface of a cylindrical outer mandrel 4 in such a manner that there are no clearances of the respective layers. This outer mandrel 4 is inserted into a case 2 for hermetic sealing and spacers 5 are inserted to both ends. An inner mandrel 3 is inserted coaxially into the outer mandrel 4 and, thereafter, the case 2 for hermetic sealing and the spacers 5 as well as the spacers 5 and the inner mandrel 3 are welded to form a molding jig 1. This process for production comprises maintaining a vacuum state in the space in this molding jig 1, then pressurizing and heating the molding jib by a hot isostatic molding device under prescribed conditions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a fiber reinforced metal-based cylindrical body which is produced by hot isostatic pressing and has high dimensional accuracy and high quality.

[0002] Conventionally, as a method for producing a fiber-reinforced metal-based cylindrical body, for example, a hot isostatic pressing method as described in Japanese Patent Publication No. 3-13943 discloses a cylindrical outer capsule and inner capsule made of metal. Using a capsule device consisting of, place a fiber reinforced metal material in which reinforcing fiber is impregnated with a base metal between the outer capsule and the inner capsule, close both end faces of the capsule device, and eliminate the air inside the capsule device. After making a vacuum state by pressurizing and heating from the outside, the inner capsule swells and the fiber reinforced metal material is compressed and molded.

However, since the fiber-reinforced metal cylinder obtained by the hot isostatic pressing method has a large volume shrinkage of the fiber-reinforced metal material at the time of molding, the orientation angle of the reinforcing fibers having a diameter of 50 to 60 mm ( The angle of the unidirectional fiber put in the base material with respect to the horizontal axis. The fiber direction is 0 degrees in the axial direction and 90 degrees in the direction perpendicular to the axis.
Call it how many times. ) Is limited to those close to the axial direction.
If the diameter is larger than that and the orientation angle is + 45 °, −45 °, 90 ° or the like close to the direction perpendicular to the axis, the reinforcing fiber may be broken and the desired strength may not be secured.

Therefore, the applicant has filed Japanese Patent Application No.
-41304, a sheet-shaped fiber-reinforced metal material composed of a reinforcing fiber having an orientation angle of 0 degree of chemically vapor-deposited silicon carbide fiber and an aluminum alloy is wrapped around a cylindrical inner mandrel one by one with one end layer wrapped around a predetermined layer. After stacking the numbers, cover the cylindrical outer mandrel and insert it into the cylindrical sealing case. Side closures are inserted into both ends of the inner mandrel and the case for sealing, and both ends are sealed by welding to form a molding jig. The air inside is sealed and evacuated to remove the vacuum, and the molding jig placed in a vacuum state is placed in the hot isostatic molding machine and heated under pressure under specified conditions, and the fiber reinforced metal material is expanded by the expansion of the inner mandrel. A core material is formed by compressing and making the inner diameter of the outer mandrel the finished size. After that, in order to strengthen the circumferential direction,
A filament is wound around the core material by a filament winding method so that the orientation angle is 90 degrees, and an aluminum alloy is plasma sprayed on the core to fix the reinforcing fiber to form a surface layer. Small in size, large diameter (diameter 100-150 mm) and thin (1-
2mm) fiber-reinforced metal-based cylindrical body molding technology is proposed.

[0005]

The fiber-reinforced metal material as described above does not have the adhesive force of the prepreg of the fiber-reinforced plastic and has a strong elasticity, and it is not easy to wind it around the inner mandrel, Since it is also difficult to fix the above state, the layers do not adhere to each other and a gap is created between the layers. Further, since the length of each layer of the fiber-reinforced metal material to be laminated is made based on the length calculated from the peripheral length after molding, as shown in FIG. 6, the fiber-reinforced metal wound around the inner mandrel 3 is laminated. In the metal material 7, the edges a are overlapped with each other and the gap is further increased. Therefore, it is necessary to increase the distance between the inner mandrel and the outer mandrel, and when the inner diameter of the outer mandrel is the finished size, it is necessary to reduce the outer shape of the inner mandrel considerably. Therefore, the volumetric shrinkage during hot isostatic pressing becomes large, and the bonding between the layers becomes non-uniform.
The overlapped portion of the end portion a remains and causes variation in the plate thickness of the cylindrical body, which causes quality deterioration.

In an attempt to form a cylindrical body reinforced in the axial direction and the circumferential direction in one step, the orientation angle of the reinforcing fibers is 0 degree for strengthening the axial direction and 90 degrees for strengthening the circumferential direction, +45 degrees,
When the fiber-reinforced metal materials of -45 degrees and the like are laminated together, the gap further increases, and the reinforcing fibers are broken due to abrupt volume contraction during hot isostatic pressing, so molding in one step is difficult.

Therefore, an object of the present invention is to reduce the gap between the layers of the fiber-reinforced metal material laminated between the inner mandrel and the outer mandrel, and to reduce the volume shrinkage ratio during hot isostatic pressing, A thin-walled cylindrical body having a large diameter (100 to 150 mm in diameter) that is uniformly joined without breakage of the reinforcing fiber is provided, and the orientation angle of the reinforcing fiber is 0 degree.
It is an object of the present invention to provide a manufacturing method capable of laminating together fiber-reinforced metal materials of 90 degrees, +45 degrees, -45 degrees and the like and molding them in one step by hot isostatic pressing.

[0008]

In order to achieve the above-mentioned object, the present invention is directed to a sheet-like preform material in which chemical vapor-deposited silicon carbide-based reinforcing fibers are aligned and whose base material is an aluminum alloy. A first step of cutting a plurality of rectangular fiber-reinforced metal materials (7) each having a predetermined orientation angle, and each of the fiber-reinforced metal materials (7) in a cylindrical outer mandrel (4). The outer mandrel and the second step of stacking both edge surfaces (8) on the circumference so that the respective edge surfaces (8) of the fiber-reinforced metal materials (7) do not overlap each other. (4) is inserted into the sealing case (2), spacers (5) are fixedly attached to both inner ends of the sealing case (2), and an inner mandrel (3) is the same as the outer mandrel (4). On the axis Inserted into the inner peripheral surface of the laminated fiber-reinforced metal material (7) and weld the sealing case (2) and the spacer (5) and the spacer (5) and the inner mandrel (3), A third step of forming a molding jig (1) in which the inner space surrounded by the sealing case (2), the spacer (5) and the inner mandrel (3) is sealed, and the spacer (5) After the air in the internal space is removed from the provided vacuuming pipe (6), the molding jig (1) is placed in a hot isostatic molding apparatus, and the heating temperature is set to 600 to 620 degrees Celsius and pressurization is performed. Pressure is 50k
The present invention is characterized in that a fiber-reinforced metal-based cylindrical body is formed by a fourth step of heating under pressure under the condition of g / cm2 to 150 kg / cm2.

[0009]

According to the method of the present invention, since the fiber-reinforced metal material has elasticity, when the fiber-reinforced metal material is rolled into a cylindrical shape and inserted into the cylinder of the outer mandrel, the fiber-reinforced metal material becomes elastic. As it spreads outwards and is pressed against the inner peripheral surface of the outer mandrel, the layers are adhered to each other and stacked in sequence without any circumferential deviation.Because the edges do not overlap, there is no gap between the layers, resulting in even contact. As a result, a dense laminate of the fiber-reinforced metal material can be obtained, and since the laminate is hot isostatically pressed, the volume shrinkage is small and an unreasonable force for breaking the reinforcing fiber is not applied. Moreover, since the density of each layer is uniform and the layers are compressed uniformly, a cylinder having a high roundness can be obtained. Further, since the number of layers that can be laminated can be increased, it becomes possible to perform hot isostatic pressing in which fiber-reinforced metal materials having different orientation angles of reinforcing fibers are also laminated. Further, since the outer diameter of the inner mandrel can be increased, the molding pressure also decreases.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a molding jig 1 in which a fiber reinforced metal material 7 is laminated on a fiber reinforced metal material 7 which is attached to a hot isostatic molding apparatus and heated and pressed by a hot isostatic molding apparatus.
FIG. 2 shows a cross section of the molding jig 1. The molding jig 1 has an inner mandrel 3 arranged coaxially inside the sealing case 2, an outer mandrel 4, and spacers 5 fixedly attached to both ends between the inner mandrel 3 and the outer mandrel 4. However, the inner mandrel 3 is made of metal or a metal foil obtained by thin-working steel or the like, and the outer mandrel 4 is made of steel or the like formed in the outer diameter dimension of a cylindrical body whose inner diameter is the finish dimension. In addition, the cylinder is divided into two for easy removal. Spacer 5
Is made of steel or the like, and is provided with a vacuuming pipe 6 for evacuating the internal space of the molding jig. FIG.
Is a fiber-reinforced metal material 7a having an orientation angle of the reinforcing fiber of 0 degree.
The fiber-reinforced metal cylinder 10a formed by stacking layers is shown in FIG.
Is a fiber reinforced molded by laminating four layers of a fiber reinforced metal material 7a having a reinforcing fiber orientation angle of 0 degrees on the inside and four layers of a fiber reinforced metal material 7b having a reinforcing fiber orientation angle of 90 degrees on the outside. The metal-based cylindrical body 10b.

Here, the fiber-reinforced metal material 7 is a sheet formed by thermally spraying a chemically vapor-deposited silicon carbide-based reinforcing fiber on a drum (not shown) with an orientation angle of 90 degrees and spraying an aluminum alloy. It is made by cutting from a sheet-shaped fiber-reinforced metal preform material according to the required orientation angle.

In the first step of the present invention, as shown in FIG. 3 and FIG. 4, for example, as shown in FIG. 3 and FIG. And the fiber-reinforced metal material 7 is cut out into a rectangular shape when expanded from the sheet-shaped fiber-reinforced metal preform material, but the set orientation angle (0 degree, 90 degree) with respect to the side in the axial direction is set. , +45 degrees, -45 degrees, etc.), and using the inner diameter of the outer mandrel 4 as the finished dimension, calculate the perimeter of each layer after forming the cylindrical body, and cut as the length of the side in the circumferential direction. The fiber-reinforced metal material 7 is made.

In the next second step, the outer mandrel 4 divided into two parts is put together and temporarily fixed by a fastening tool such as a band or a ring, and the fiber reinforced metal material 7 is set in the order set from the outer layer of the cylindrical body. Are rolled into a cylindrical shape, inserted into the cylinder of the outer mandrel 4 and brought into close contact with each other, and are sequentially laminated. At this time, as shown in FIG. 5, the edge surfaces 8 of the fiber-reinforced metal material 7 are abutted with each other, and the abutting portions 9 of the layers are not in the same position. When the layers are brought into close contact with each other and the edge surfaces 8 overlap each other, the excess end portions are cut off so as to be in a butted state.

By the third step, the outer mandrel 4 laminated with the fiber-reinforced metal material 7 is inserted into the sealing case 2 while removing the tightening tool, and the spacers 5 are inserted into both inner ends of the sealing case 2. Swivel and insert the inner mandrel 3. Next, the molding case 1 is formed by welding the entire circumference of the sealing case 2 and the spacer 5 and the entire circumference of the spacer 5 and the inner mandrel 3 to seal the internal space between the sealing case 2 and the inner mandrel 3. It If the sealing case 2, the spacer 5 and the inner mandrel 3 are made of the same material, the welding work is easy and the welding can be surely performed.

In the fourth step, the evacuation pipe 6 provided on the spacer 5 is connected to a vacuum suction device (not shown) so that the air in the internal space has a degree of vacuum of 1 × 10 −2.
Eliminate until about torr. Then, in a vacuum state, the molding jig 1 is arranged and mounted inside a hot isostatic molding machine (not shown), and the temperature is 600 ° C. to 6 ° C.
20 degrees, pressure 50kg / cm2 ~ 150kg / cm2,
If the holding time is set to 30 minutes as a reference, the aluminum alloy as the base material does not melt and flow, and the fiber-reinforced metal-based cylindrical body 10 is formed without deterioration or breakage of the reinforcing fibers.

Then, the molded fiber-reinforced metal-based cylindrical body 10 is taken out from the molding jig 1. First, the welded portions of the sealing case 2, the spacer 5, and the spacer 5 and the inner mandrel 3 are cut off, The spacer 5 is removed from the sealing case 2, the outer mandrel 4, the cylindrical body 10 and the inner mandrel 3 are extracted together, the outer mandrel 4 divided into two is removed, and then the inner mandrel 3 is removed from the cylindrical body 10. However, since the cylindrical body 10 and the inner mandrel 3 are not in close contact with each other due to the difference in thermal expansion of the materials, the inner mandrel 3 can be easily removed from the cylindrical body 10 by making a cut in the inner mandrel 3 with a band saw or the like. .

Here, according to the above manufacturing method, the outer mandrel 4 has an inner diameter of 130 mm and an axial length of 250.
As shown in FIG. 3, when the fiber-reinforced metal material 7a in which the orientation angle of the reinforcing fiber is 0 degree is laminated in 8 layers,
As shown in FIG. 4, a fiber-reinforced metal-based cylindrical body in which four layers of fiber-reinforced metal material 7a having an orientation angle of 0 degrees are laminated on the inside and four layers of fiber-reinforced metal material 7b having an orientation angle of 90 degrees are laminated on the outside. An example of manufacturing 10 will be described.

When the outer mandrel 4 made of steel having an inner diameter of 130 mm is combined and fixed, as shown in FIG. 5, when the fiber reinforced metal material 7a having an orientation angle of 0 degrees has eight layers, the fiber reinforced metal material is Each layer of 7a is rolled into a cylindrical shape and inserted into the tube of the outer mandrel 4, and pressed toward the inner peripheral surface to be in close contact with each other to sequentially stack 8 layers. When four layers of the fiber-reinforced metal material 7 having the orientation angle of 0 degree and the orientation angle of 90 degrees are alternately laminated by four layers, first, the layer of the fiber-reinforced metal material 7a having the orientation angle of 0 degree is rolled into a cylindrical shape and the outer mandrel is formed. Inserted in the cylinder of No. 4 and pressed against the inner peripheral surface to be in close contact, then the fiber-reinforced metal material 7b having an orientation angle of 90 degrees is laminated, and thereafter, 8 layers of 4 layers are alternately laminated. It should be noted that it is fundamental to stack layers having different orientation angles alternately, but it is desirable to make them symmetrical with respect to the center line in the thickness direction. For example, in the case of the present application, 0 degrees, 90 degrees, 0 degrees, 90 degrees, 90 degrees, 0 degrees, 9 degrees from the inside.
It may be 0 degree or 0 degree.

Incidentally, according to the conventional method as shown in FIG.
The outer diameter of the inner mandrel 3 to be inserted into the outer mandrel 4 having an inner diameter of 130 mm wound by 8 layers around the inner mandrel 3 needs to be smaller than 110 mm, whereas according to the present invention, the orientation angle is as shown in FIG. 0
The outer diameter of the insertable inner mandrel 3 was 121 mm when eight layers of the fiber-reinforced metal material 7a were laminated. The volume occupied by the fiber-reinforced gold material 7 and the gap between the inner mandrel 3 and the outer mandrel 4 at this stage was reduced by 53% in the present invention. Since the outer diameter of the inner mandrel 3 can be increased, the molding pressure can be reduced.

Next, the outer mandrel 4 on which the fiber-reinforced gold material 7 is laminated is inserted into the sealing case 2, the spacers 5 are inserted on both sides inside the sealing case 2, and the inner mandrel 3 is inserted. . Next, the entire circumferences of the sealing case 2 and the spacer 5, and the spacer 5 and the inner mandrel 3 are welded to completely seal the internal space between the sealing case 2 and the inner mandrel 3 to form the molding jig 1. Form. Then, the air in the internal space is removed from the evacuation pipe 6 until the degree of vacuum reaches 1 × 10 −2 torr. Then, the molding jig 1 is heated at a temperature of 600 ° C. and a pressure of 50 k by a hot isostatic molding device (not shown).
Molding was completed by holding at g / cm @ 2 for 30 minutes.

The fiber-reinforced metal cylinder 10 taken out from the molding jig has the orientation angles of the reinforcing fibers of 0 degree and 90 even when eight layers of the fiber-reinforced metal material 7 having the orientation angle of the reinforcing fibers of 0 degree are laminated. In the case where four layers of each fiber-reinforced metal material 7 are laminated, the fiber-reinforced metal-based cylindrical body 10 having an outer diameter of 130 mm and a wall thickness of 1.6 mm can be obtained, and deformation and variation in plate thickness can be obtained. In addition, the dimensional accuracy was excellent, the fiber did not deteriorate or break, and the strength was the same as the theoretical value. The dimensional accuracy and quality were stable.

[0022]

As described above, according to the present invention, there is no overlap between the layers of the fiber-reinforced metal material and there is almost no gap, and the layers are evenly adhered to each other and hot isostatic pressure is applied. Since it is molded, volumetric shrinkage during molding is reduced, there is no deformation or variation in plate thickness, there is no deterioration or breakage of the fiber, and a high-quality fiber-reinforced metal cylindrical body with high roundness is stable. Can be manufactured. In addition, it was impossible in the past to obtain a thick and thin fiber by hot isostatic pressing by simultaneously laminating fiber reinforced metal materials with an orientation angle of reinforcing fiber that strengthens the axial direction and an angle that strengthens the circumferential direction. It is possible to manufacture a reinforced metal element cylindrical body and improve the efficiency of the molding work.

[0023]

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a molding jig for producing a fiber-reinforced metal-based cylindrical body according to the present invention.

FIG. 2 is a cross-sectional view of a molding jig for manufacturing a fiber-reinforced metal-based cylindrical body according to the present invention.

FIG. 3 is a part of an outline drawing and a cross-sectional view of a fiber-reinforced metal-based cylindrical body manufactured by laminating fiber-reinforced metal materials having a reinforcing fiber orientation angle of 0 ° according to the present invention.

FIG. 4 is a part of an outline view and a cross-sectional view of a fiber-reinforced metal-based cylindrical body manufactured by laminating reinforcing metal materials having reinforcing fiber orientation angles of 0 ° and 90 ° according to the present invention.

FIG. 5 is a view showing a state in which a fiber-reinforced metal material is being laminated on the outer mandrel of the molding jig according to the present invention.

FIG. 6 is a view showing a state in which a fiber-reinforced metal material is laminated on an inner mandrel of a molding jig by a conventional method.

[Explanation of symbols]

 1 Molding jig 2 Sealing case 3 Inner mandrel 4 Outer mandrel 5 Spacer 6 Vacuum suction pipe 7 Fiber reinforced metal material

Claims (2)

[Claims] 1. A rectangular fiber-reinforced metal having a plurality of layers each having a predetermined orientation angle in a fiber direction from a sheet-like preform material in which chemically vapor-deposited silicon carbide-based reinforcing fibers are aligned and whose base material is an aluminum alloy. In the first step of cutting the material (7), both edge surfaces (8) of the respective fiber reinforced metal materials (7) are butted against the inner circumference of the cylindrical outer mandrel (4), and Fiber-reinforced metal materials (7)
Second step of stacking so that the positions of the butted edge surfaces (8) do not overlap each other, and the outer mandrel (4) is inserted into the sealing case (2), and the sealing case (2) is inserted.
Spacers (5) are attached to both inner ends of the fiber, and the inner mandrel (3) is attached to the inner peripheral surface of the laminated fiber reinforced metal material (7) with the same axis as the outer mandrel (4). Then, the sealing case (2) and the spacer (5) and the spacer (5) and the inner mandrel (3) are welded to each other to weld the sealing case (2), the spacer (5) and the inner mandrel (3). The third step of forming a molding jig (1) in which the inner space surrounded by is sealed, and after removing the air in the inner space from the evacuation pipe (6) provided in the spacer (5), A method for producing a fiber-reinforced metal-based cylindrical body, characterized in that the molding jig (1) is arranged in a hot isostatic molding apparatus and is molded by a fourth step of heating under pressure under a predetermined condition. 2. The predetermined conditions in hot isostatic pressing are characterized in that the heating temperature is 600 ° C. to 620 ° C. and the pressurizing pressure is 50 kg / cm 2 to 150 kg / cm 2. The method for producing a fiber-reinforced metal-based cylindrical body according to.