JPH04747B2 - - Google Patents

Description

Detailed Description of the Invention A. Purpose of the Invention (1) Industrial Field of Application The present invention relates to a cylinder block made of a fiber-reinforced light alloy used in an engine, and in particular, to a cylinder block made of a fiber-reinforced light alloy used in an engine, in particular, a cylinder block made of a cylindrical fiber molded body and a light alloy matrix. The present invention relates to a method for manufacturing a fiber-reinforced composite comprising:

(2) Prior Art Conventionally, when manufacturing the cylinder block, a cylindrical fiber molded body and a metal core of a mold are fitted together, and the cylinder block material is pressure cast using the molten metal of the light alloy matrix. At the same time, the fiber molded body is filled with molten metal to obtain a fiber reinforced composite.

(3) Problems to be solved by the invention In order to easily fit the fiber molded body and the mandrel and to prevent damage to the fiber molded body due to the fitting operation, it is necessary to It is necessary to increase the amount.

However, with this configuration, a relatively large clearance is created between the mandrel and the fibrous molded body, so there is a risk that the fibrous molded body will be deformed and destroyed by the filling pressure of the molten metal during the casting process.

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

B. Structure of the Invention (1) Means for Solving Problems The present invention manufactures a fiber-reinforced light alloy cylinder block in which the cylinder bore is surrounded by a fiber-reinforced composite made of a cylindrical fiber molded body and a light alloy matrix. In doing so, fitting a reinforcing cylinder made of powdered refractories bonded with a thermosetting synthetic resin inside the fiber molded body and preheating the fiber molded body;
The fiber molded body and the metal core of the mold are fitted together through the reinforcing cylinder, and the cylinder block material is pressure cast using the molten metal of the light alloy matrix, and at the same time, the fiber molded body is filled with the molten metal. A step of obtaining the fiber-reinforced composite; and a step of subjecting the cylinder block material to solution treatment and then aging treatment, and during these treatments, thermally collapsing and removing the reinforcing tube. .

(2) Effect According to the above method, even if the fitting allowance between the mandrel and the reinforcing cylinder is made small, the fiber molded body can be brought into the fitted state with respect to the mandrel without damaging it. be able to.

This makes it possible to minimize the clearance between the mandrel and the fiber molded body, thereby preventing deformation of the fiber molded body due to the filling pressure of molten metal during the casting process and avoiding its destruction. .
Further, in this casting process, thermal damage to the reinforcing tube is avoided due to the heat resistance of the reinforcing tube and the cooling effect from the core metal.

Furthermore, the strength of the cylinder block can be increased by solution treatment and aging treatment. At the same time, the reinforcing tube can be naturally removed using the heat of the heat treatment, so there is no need to perform any special work to remove the reinforcing tube, and finishing of the cylinder bore becomes easy.

By using the above method, it is possible to obtain a high-strength light alloy cylinder block whose cylinder bore is reliably fiber-reinforced.

(3) Example Figures 1 to 3 show a fiber-reinforced aluminum alloy Siamese-type cylinder block S as a fiber-reinforced light alloy cylinder block obtained according to the present invention, and the cylinder block S consists of a plurality of cylinder blocks S arranged in series. , the illustrated example has four cylinder barrels 1 ₁ to 1 ₄
Siamese cylinder barrel 1 made by combining
, an outer wall 2 surrounding the Siamese cylinder barrel 1, and a crankcase 3 connected to the lower edge of the outer wall 2. The four cylinder bores in each of the cylinder barrels 1 ₁ to 1 ₄ are made of a fiber-reinforced composite Cf made of a cylindrical fiber molded body and an aluminum alloy matrix.

A water jacket 6 is formed between the Siamese cylinder barrel 1 and the outer wall portion 2, and the outer periphery of the Siamese cylinder barrel 1 is exposed to the water jacket 6. At the end of the water jacket 6 on the cylinder head side, the Siamese cylinder barrel 1 and the outer wall 2 are partially connected by a plurality of reinforcing deck parts 8, and the adjacent reinforcing deck parts 8 communicate with each other to the cylinder head side. It functions as a mouth 7. As a result, the cylinder block S is constructed into a closed deck type.

5 to 8 show a casting device for casting the cylinder block material Sm shown in FIG.
and the first and second side molds 10 ₁ , which are disposed below the upper mold 9 and are divided into left and right halves in FIGS. 5 and 6.
10 ₂ and the third half of the left and right halves in Figure 7.
and fourth side molds 10 ₃ , 10 ₄ and each side mold 10 ₁ to
It consists of a lower mold 11 on which a mold ₁₀₄ is slidably placed.

A mold clamping recess 12 is formed on the lower surface of the upper mold 9,
The recess 12 cooperates with the upper half of each side mold 10 ₁ to 10 ₄ to define a first cavity C ₁ for molding the Siamese cylinder barrel 1 and the outer wall 2 . A mold clamping protrusion 13 that fits into the recess 12 is provided protrudingly from the upper surface of each of the side molds 10 ₁ to 10 ₄ .

As shown in FIGS. 7 and 8, the lower mold 11 includes a sump 14 that receives molten aluminum alloy from a melting furnace (not shown), a hot water supply cylinder 15 that communicates with the sump 14, and a hot water supply cylinder 15 that communicates with the sump 14. A plunger 16 that slides on the cylinder 15, and a pair of runners 17 that branch into two from the sump 14 and extend in the longitudinal direction of the first cavity _C1 and over approximately the same length as the first cavity C1 are provided. . The lower mold 11 also has a molding block 18 projecting upward between the two runners 17, and the molding block 18 cooperates with the lower half of each side mold ₁₀₁ to ₁₀₄ to mold the crankcase 3. A second cavity _C2 is defined for the purpose. that cavity
The upper end of C ₂ communicates with the first cavity C ₁ , and the lower ends of both sides communicate with both runners 17 via a plurality of weirs 19 .

The molding block 18 includes four tall semi-cylindrical first molding parts ₁₈₁ formed at predetermined intervals;
Between adjacent first molded parts 18 ₁ and both outermost first molded parts 18 1
It consists _of a convex second molding part ₁₈₂ located outside the molding part 181, and each first molding part ₁₈₁ is for molding a rotation space 20 for a crank pin and a crank arm (FIGS. 2 and 3). The second molded part 18 ₂ is used for the bearing holder 2 of the crank journal.
1 (Figures 2 and 3). Each weir 19 is provided corresponding to each second forming part 18 ₂ so that the molten metal can be quickly injected into the larger capacity part of the second cavity C ₂ .

The runners 17 are arranged such that the cross-sectional area of both runners 17 gradually decreases from the water reservoir 14 side toward the runner tip 17a.
The bottom surface of 7 is formed in the shape of several steps ascending from the trough portion 14 side. Each rising portion 17c connected to each step portion 17b is formed diagonally so that the molten metal can be smoothly guided to each weir 19.

When the cross-sectional area of the runner 17 is reduced in stages in this way, a large amount of molten metal is injected into the second cavity _C2 through the weir 19 at a slow speed in the large cross-sectional area, and a small amount is injected in the small cross-sectional area. can be injected into the second cavity C ₂ through the weir 19 at a high speed, so that the molten metal in the cavity C ₂
The molten metal is injected into the runner 17 substantially uniformly over the entire length of the runner 17. Therefore, the molten metal does not cause turbulence within the cavity _C2 , and gases such as air are prevented from being drawn into the molten metal, thereby avoiding the formation of cavities. Further, since the molten metal injection work is performed efficiently, casting efficiency can be improved.

As shown in FIGS. 5 and 6, each first molding section 18
A positioning protrusion 22 for erecting a fiber molded body, which will be described later, is provided on the top surface of the holder ₁ , and a recess 23 is formed in the center of the positioning protrusion 22. In addition, positioning protrusions 22 are provided on the two first molded parts 18 ₁ located on both sides.
Through holes 24 passing through the first molded portion 18 ₁ are formed on both sides of the molded portion 18 1 , and a pair of temporary installation pins 25 are slid into the through holes 24 , respectively. These temporary installation pins 25 are used for temporary installation of a sand core for a water jacket, which will be described later. The lower ends of both temporary installation pins 25 are fixed to a mounting plate 26 disposed below the forming block 18. Two support rods 27 are inserted through the mounting plate 26, and a coil spring 28 is inserted between the lower part of each support rod 27 and the lower surface of the mounting plate 26.
will be reduced. When the mold is opened, the mounting plate 26 receives the elastic force of each coil spring 28 and supports each support rod 27.
The tip of each temporary installation pin 25 rises until it comes into contact with the stopper 27a at the tip, and as a result, the tip of each temporary installation pin 25 touches the first molded part 1.
8 _1Protrudes from the top surface. A recess 25a that engages with the lower edge of the sand core is formed on the tip end surface of each temporary installation pin 25.

In addition, in the two first molded parts 18 ₁ located on both sides,
A through hole 29 passing through the first molded portion 18 ₁ is formed at a bisecting position between both through holes 24 , and an operating pin 30 whose lower end is fixed to the mounting plate 26 is slid into the through hole 29 . When opening the mold, actuating pin 3
The tip of the pin 0 protrudes into the recess 23 and is pushed down by a mandrel, which will be described later, when the mold is closed, thereby causing both temporary installation pins 25 to be retracted from the top surface of the first molded part ₁₈₁ .

The first in the first and second side molds 10 ₁ , 10 ₂
Core holders 31 for actually installing sand cores are provided at two locations in the center of the wall defining the cavity _C1 . Each core holder 31 includes an engagement hole 31a for positioning the sand core, and a clamping surface 31b formed on the outer periphery of the opening to clamp the sand core.

A first cavity is placed in the mold clamping recess 12 of the upper mold 9.
A plurality of third cavities C ₃ for communicating with C ₁ to overflow the molten metal and a fourth cavity C ₄ for forming the communication port 7 are each opened,
Further, gas vent holes 32 and 33 are formed in the upper die 9, respectively, and communicate with the third cavity _C3 and the fourth cavity _C4 .

A closing pin 34 is attached to the gas vent holes 32 and 33,
35 are loosely inserted, and the closing pins 34,
The upper end portion of the mold 35 is fixed to a mounting plate 36 disposed above the upper mold 9.

Both cavities C ₃ of each gas vent hole 32, 33,
Small diameter portions 32a and 33a extending upward over a predetermined length from the communicating end with respect to _C4 are connected to each closing pin 3.
4, 35 and the third cavity C ₃
and the fourth cavity _C4 can be closed.

A hydraulic cylinder 3 is installed between the top surface of the upper die 9 and the mounting plate 36.
9 is interposed, and the mounting plate 36 is raised and lowered by the operation of the hydraulic cylinder 39, and the small diameter portions 32a, 33a are opened and closed by the respective closing pins 34, 35. 40 is a guide rod for the mounting plate 36.

On the ceiling surface of the mold clamping recess 12 in the upper mold 9, the axis line is placed upward, corresponding to each cylinder barrel 1 ₁ to _{1 4} .
A mandrel 41 facing downward is provided protrudingly, and each mandrel 41
A convex portion 41a that can fit into the concave portion 23 on the top surface of the first molded portion ₁₈₁ is provided on the lower end surface of the molded portion 181. Also, shinkin 41
has a very gentle draft.

9 and 10 show a sand core 59 for a water jacket, and the sand core 59 has four cylindrical portions 60 1 to 60 ₁ corresponding to the four cylinder barrels 1 ₁ to 1 ₄ of the cylinder block S. A core main body 61 which is provided with 60 ₄ and lacks the surrounding walls where the adjacent ones overlap each other, a communication port 7 that communicates the water jacket with the water jacket of the cylinder head, and a reinforcing deck part 8.
In order to form a plurality of protrusions 62 protruding from the upper end surface of the core body 61 and protrusions protruding from both outer surfaces of the two cylindrical parts 60 ₂ and 60 ₃ located in the middle of the core body 61, respectively. The baseboard 63 is made of Each baseboard 63 has a large diameter portion 63a integrated with the core body 61,
It is formed with a small diameter portion 63b protruding from the end surface thereof.

In FIG. 11, the cylindrical fiber molded body F is molded from a mixed fiber of carbon fiber and alumina fiber as reinforcing fibers, and its dimensions are, for example, an outer diameter of 82 mm, an inner diameter of 78 mm, and a height of 152 mm. Therefore, the wall thickness is as thin as 2 mm. In addition, the fiber volume fraction (Vf) is 24%. The fiber molded body F has an average diameter
Carbon fiber (short fiber) with an average length of 18μm and 0.8mm,
Alumina fibers (short fibers) with an average diameter of 3 to 4 μm and an average length of 0.5 mm are mixed at a ratio of 1:3, and silica sol is added to the mixed fibers as a binder. Using a sol-form molding material, suction adhesion molding is performed. It is formed by applying the law.

The suction adhesion molding method is a method in which a cylindrical mold with air permeability with both ends sealed is set upright in a tank containing the molding material, and a suction action is applied to the inside of the mold to coat the outer peripheral surface of the mold. This refers to a method of adsorbing the molding material.

The fiber molded body F molded by the above method is used after being released from the mold and subjected to a drying and firing process.
In this drying process, since the fiber molded body F is thin, heat distribution is good, and therefore the binder is uniformly dried over the entire body.

As shown in FIG. 11, a reinforcing tube T is fitted inside the fiber molded body F, thereby improving the handling of the thin and fragile fiber molded body F.

The reinforcing tube T is made by bonding a powdered refractory material such as zircon powder with a thermosetting synthetic resin such as a phenol resin, and is adapted to fit tightly with the fiber molded body F and the core metal 41.

The reinforcing tube T is manufactured as follows.

Water 50 Water-soluble phenolic resin (binder) 5Kg 5% aqueous solution of sodium dialkyl sulfosuccinate (wetting agent) 0.5Kg Antifoaming agent 0.1Kg are mixed, and this mixture is then mixed with 120Kg of zircon powder with a particle size of 10μm and a powder with a particle size of 1μm. Add 50Kg of zircon powder and mix thoroughly until the viscosity is 400~500cP
An alkaline slurry molding material is prepared.

This molding material is injected into a mold heated to 200 to 250°C and left for 2 minutes to harden the molding material and form the reinforcing tube T.

Next, the casting operation of the cylinder block material Sm by the casting apparatus using the fiber molded body F having the reinforcing tube T will be explained.

First, as shown in FIG. 5, the upper mold 9 is raised, and the opposing molds 10 ₁ , 10 ₂ ; 10 ₃ , 10 ₄
The molds are opened by moving them apart from each other. The hydraulic cylinder 39 on the upper mold 9 is operated to raise each closing pin 34, 35 via the mounting plate 36, and the upper openings of the small diameter portions 32a, 33a communicating with the third and fourth cavities _C3 , _C4 are opened. open. Furthermore, the plunger 16 in the hot water supply cylinder 15 is lowered.

After preheating the fiber molded body F to approximately 250°C, as shown in FIG.
8 Fits into the positioning protrusion 22 _{of 1} to form the fiber molded body F.
is installed upright in the first molding section ₁₈₁ .

Further, as shown in FIGS. 5 and 10, the lower edges of the cylindrical portions 60 ₁ and 60 ₄ on both sides of the sand core 59 are connected to the concave portions of the temporary installation pins 25 that protrude to the top surfaces of the first molded portions 18 ₁ on both sides. 25a to temporarily install the sand core 59. Each of the cylindrical portions 60 ₁ to 60 ₄ of the sand core 59 is arranged around the outer periphery of each fiber molded body F.

As shown in FIG. 6, the two-sided molds 10 ₁ and 10 ₂ are moved a predetermined distance in the direction in which they approach each other,
Each core holder 31 and each baseboard 63 are engaged and the sand core 5 is
9 books will be installed. That is, the sand core 59 is positioned by fitting the small diameter portion 63b of each baseboard 63 in the sand core 59 into the engagement hole 31a of each core receiver 31, and also aligning the cylinder barrel arrangement direction of each large diameter portion 63a. The sand core 59 is clamped by the clamping surfaces 31b of each core holder 31 by abutting the end surfaces parallel to the clamping surfaces 31b of each core holder 31. Further, the other double-sided molds 10 ₃ and 10 ₄ are also moved in the same manner.

Next, the upper die 9 is lowered, and the core metal 41 is attached to the reinforcing tube T.
The upper end surfaces of the fiber molded body F and reinforcing cylinder T abut against the ceiling surface of the recess 12, thereby positioning and fixing the fiber molded body F. In this case, even if the fitting allowance between the mandrel 41 and the reinforcing tube T is made small, the fiber molded body F will not be damaged.
It can be brought into a fitted state with respect to the mandrel 41.

The convex portion 41a of the mandrel 41 is the first molded portion 18.
_1, the actuating pin 30 fits into the recess 23 on the top surface.
is pushed down and each temporary installation pin 25 is retracted from the top surface of the first molded part ₁₈₁ . Further, each protrusion 62 of the sand core 59 is loosely inserted into each fourth cavity C ₄ , and the recess 12 of the upper mold 9 is inserted into the convex portion 1 of each side mold 10 ₁ to 10 ₄ .
3 and mold clamping is performed.

730 to 740℃ from the melting furnace to the sump 14 of the lower mold 11
molten aluminum alloy (for example, JIS ADC12) is supplied, and the plunger 16 is
m/sec, and as shown in Fig. 12, the molten metal is pumped from both runners ₁₇ through the weir 19 into the second cavity _C2 and the first cavity _C1 from both lower parts of the second cavity _C2 . inject. Gas such as air in both cavities C ₁ and C ₂ is pushed up by the molten metal and flows into the third and fourth cavities C ₃ and
It escapes above the upper mold 9 through gas vent holes 32 and 33 communicating with _C4 .

In this case, the bottom surface of the runners is formed in the shape of several steps ascending from the trough portion 14 side so that the cross-sectional area of both runners 17 gradually decreases toward the runner tip 17a as described above. As the plunger 16 rises, the molten metal is injected from both runners 17 through the weirs 19 into the second cavity C ₂ almost equally over its entire length from both lower parts.

Moreover, the small diameter portion 32a of the gas vent holes 32, 33,
Since the opening of 33a is narrow, the first and second
When molten metal is injected into the cavities C ₁ and C ₂ , back pressure is generated within the cavities C ₁ and C ₂ , and the back pressure acts equally on the entire surface of the molten metal. As a result, the molten metal surface is suppressed from undulating and rises substantially horizontally, thereby preventing gas from being entrained in the molten metal, and degassing efficiently, thereby avoiding the formation of cavities. Due to the back pressure, the first and second cavities C ₁ ,
As shown in FIG. 12, the injection pressure of the molten metal in C ₂ is a pressure p ₁ higher than atmospheric pressure, for example, 2 to 5 kg/
It becomes ^cm2 .

Furthermore, since the fibrous molded body F is preheated to the above temperature, the molten metal around the fibrous molded body F is kept warm, thereby preventing the molten metal from adhering to the fibrous molded body F.

When the molten metal is completely injected into the third and fourth cavities C ₃ and C ₄ , the hydraulic cylinder 39 on the upper mold 9
to lower the mounting plate 36 and close the closing pin 3.
4 and 35 close the small diameter portions 32a and 33a communicating with both cavities C ₃ and C ₄ .

Thereafter, the plunger 16 is raised at a speed of 0.14 to 0.18 m/sec to maintain the molten metal under a high pressure p ₂ exceeding the pressure p ₁ , that is, under a pressure of 400 kg/cm ² for a predetermined time to form a fiber-reinforced composite Cf. In addition, the molten metal is completely solidified under this high pressure to densify the structure of the aluminum alloy and improve its strength. In the process of increasing the pressure of the molten metal, the pressure of the molten metal is 5 to 20 kg/cm ²
The molten metal is filled into the fiber molded body F.

In this way, the filling pressure of molten metal is low, and the reinforcing tube T
Since the clearance between the fibrous molded body F and the mandrel 41 is small, deformation of the fibrous molded body F due to the filling pressure of the molten metal can be prevented and destruction thereof can be avoided. In this case, since the fiber molded body F is thin, filling with the molten metal is carried out efficiently and reliably, thereby making it possible to obtain a fiber-reinforced composite Cf free from casting defects such as microporosity. Further, in this casting process, thermal damage to the reinforcing tube T is avoided due to the heat resistance of the reinforcing tube T and the cooling effect from the core metal 41.

Since the sand core 59 is held in a precise position by the molds 10 ₁ and 10 ₂ on both sides through its respective baseboards 63, the sand core 59 is held in a precise position by the molds 10 1 and 10 2 on both sides, so that when pouring molten metal into the first cavity C ₁ and when pouring the molten metal into the first cavity C ₁ . When the molten metal inside is pressurized, the sand core 59 does not float or sag. Further, the end surface of the large diameter portion 63a of each baseboard 63 is the clamping surface 31 of the core receiver 31 in the double-sided types 10 ₁ and 10 _{2 .}
b, so that when the sand core 59 tends to swell, the deformation force is supported by each clamping surface 31b, which prevents the sand core 59 from deforming and causes the 4th circumference of each cylinder bore to expand. A Siamese cylinder barrel 1 having a uniform wall thickness is obtained.

When the mold is opened after the molten metal has solidified, the fourth
The cylinder block material Sm shown in the figure is obtained.

The cylinder block material Sm is subjected to solution treatment and then aging treatment to improve the overall strength of the material Sm.
In particular, it increases the hardness and improves the wear resistance of the fiber reinforced composite Cf.

This solution treatment is applied to cylinder block material Sm
is heated to 480-500°C, held at that temperature for 4-6 hours, and then cooled with water. In the aging treatment, the cylinder block material Sm is heated to 160 to 220°C, maintained at that temperature for 4 to 8 hours, and then cooled in a furnace.

Since the reinforcing tube T thermally collapses during the above process, the reinforcing tube T is naturally removed, and therefore the reinforcing tube T
No special work is required to remove it.

When the cylinder block material Sm is subjected to a grinding process to remove the protrusions 64 formed by the cooperation between the fourth cavities _C4 and the protrusions 62 of the sand core 59, the protrusions 62 form the communication ports 7. Furthermore, reinforcing deck portions 8 are formed between adjacent communication ports 7, and water jackets 6 are obtained by further removing sand. After that, by performing predetermined processing such as finishing the cylinder bore 4, the first
- As shown in FIG. 3, a cylinder block S is obtained in which the cylinder bore 4 is made of a cylindrical fiber-reinforced composite Cf. In this case, since the reinforcing tube T has already been removed, the cylinder bore 4 can be easily finished.

Note that the fiber molded body F may be molded from one type of reinforcing fiber. Furthermore, instead of the silica sol, it is also possible to use a single alumina sol or a mixture of silica sol and alumina sol.
Furthermore, a magnesium alloy or the like can also be used in addition to the aluminum alloy.

C Effect of the invention According to the invention, by using the reinforcing tube,
It is possible to provide a high-strength light alloy cylinder block in which the periphery of the cylinder bore is reliably reinforced with fibers while avoiding destruction of the fiber molded body during the fitting process with the mandrel and the casting process. In addition, since the reinforcing cylinder is removed naturally by using the heat generated during the heat treatment process of the cylinder block material, special work for removing the reinforcing cylinder is not required, and furthermore, finishing machining of the cylinder bore can be done easily. There are also some advantages.

[Brief explanation of drawings]

1 to 3 show a Siamese-type cylinder block obtained according to the present invention, FIG. 1 is a perspective view seen from above, FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG. A-a line sectional view, 3rd
The figure is a perspective view seen from below, and Figure 4 is a perspective view of the Siamese type cylinder block material seen from above.
Figure 5 is a longitudinal sectional front view of the casting machine when the mold is opened;
The figure is a longitudinal sectional front view of the casting machine when the mold is closed, Figure 7 is a sectional view taken along the line of Figure 6, Figure 8 is a sectional view taken along the line of Figure 7, and Figure 9 is a perspective view of the sand core seen from above. figure,
10 is a sectional view taken along the line shown in FIG. 9, FIG. 11 is a perspective view showing the relationship between the fiber molded body and the reinforcing tube, and FIG.
The figure is a graph showing the relationship between molten metal pressure and time. Cf...fiber reinforced composite, F...fiber molded body,
M...Mold, Sm...Siamese type cylinder block material, T...Reinforcement cylinder, 41...Mandrel.

Claims (1)

[Claims] 1. In manufacturing a fiber-reinforced light alloy cylinder block, which is constructed around the cylinder bore from a fiber-reinforced composite consisting of a cylindrical fiber molded body and a light alloy matrix, reinforcement is made by bonding powdered refractories with thermosetting synthetic resin. fitting a cylinder inside the fiber molded body and preheating the fiber molded body; fitting the fiber molded body and a metal core of a mold via the reinforcing cylinder, and heating the light alloy matrix; pressure-casting a cylinder block material using the molten metal; simultaneously filling the fiber molded body with the molten metal to obtain the fiber-reinforced composite; subjecting the cylinder block material to solution treatment and then aging treatment; a step of thermally collapsing and removing the reinforcing tube during the treatment;
A method for manufacturing a fiber-reinforced light alloy cylinder block, characterized by using the following.