JP2002336954A - Cylinder liner enveloped casting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylinder liner enveloped casting method capable of improving the anchoring effect of an outer circumferential part of a cylinder liner and miniaturizing a cylinder block. SOLUTION: This cylinder liner enveloped casting method comprises a step of manufacturing an aluminum-based composite billet, a step of forming the aluminum-based composite billet into a cylinder and forming a rib on an outer surface of the cylinder, a drawing step of compressing the rib from tip sides thereof to form an undercut shape at the root of the rib, a cutting step of cutting a drawn member to form a cylinder liner, and a casting step of setting the cylinder liner in a mold of the cylinder block and pouring the molten metal therein. Since the rib is compressed from the tip side to form the undercut shape at the root in the drawing step, the stress is not concentrated at a corner of the root, and cracks of the root part can be prevented. Since the rib is compressed, the rib is reduced in height, and the cylinder liners can be brought close to each other accordingly, and the cylinder block can be miniaturized thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cast-molding a cylinder liner.

[0002]

2. Description of the Related Art A cylinder block as shown in the following figure is an example of a cylinder liner cast in an engine. Next, the method of cast-molding the cylinder liner will be described with reference to the following drawings. FIG. 20 is an explanatory diagram of a conventional method of cast-in forming a cylinder liner. First, the cylinder liner 10
1 are formed, and then the cylinder liners 101 are set in a mold (not shown) separated by a cylinder pitch P, and then die-cast into the mold. The cylinder block 103 in which the cylinder liners 101 are cast in the cylinder portion 102 can be obtained by filling the molten metal with the machine. By casting the cylinder liner 101 in this way, the wear resistance of the cylinder can be improved.

[0003]

However, when the cylinder pitch of the cylinder block 103 is set to P and the cylinder liner 101 is cast-in, the casting thickness between the cylinder liner 101 and the adjacent cylinder liner 101 becomes T2. And it was difficult to secure the strength between the cylinder liners 101.
In this case, there has been a demand for a cylinder liner capable of improving an anchoring effect, securing a casting wall thickness, and reducing the size of a cylinder block while following a convex portion on the outer surface of the cylinder liner.

It is an object of the present invention to provide a cylinder liner cast-in molding method capable of improving the anchor effect of the outer peripheral portion of the cylinder liner and reducing the size of the cylinder block.

[0005]

Means for Solving the Problems To achieve the above object, a first aspect of the present invention is to place an aluminum alloy and magnesium or a magnesium source in a furnace together with a porous formed body made of an oxide-based ceramic. The process of reducing oxide-based ceramics by the action of aluminum and infiltrating the molten aluminum alloy into the porosity of the oxide-based ceramics to produce an aluminum-based composite billet, and extruding the aluminum-based composite billet into a cylinder by pressing and pressing At the same time, an extrusion step of forming a rib on the outer surface of the cylinder, and a drawing step of finishing the extruded material after extrusion with a drawing device, compressing the rib from the tip side and forming an undercut shape at the root of the rib, Cut the drawn material to a specified length after drawing to form an aluminum matrix composite cylinder liner That to the cutting step, a casting step of pouring by setting the cylinder liner into the mold of the cylinder block, characterized in that it consists of.

At the same time as the billet is formed into a cylinder in the extrusion process, the rib is formed on the outer surface of the cylinder, thereby forming the rib into the first stage shape. In the drawing step, the rib of the extruded material is compressed from the tip side to form an undercut shape at the root of the rib, so that stress is not concentrated at a corner of approximately 90 ° of the root, and there is no risk of cracking from the root. . Further, since the rib of the extruded material is compressed from the tip side to form an undercut shape at the root of the rib, the anchor effect of the cylinder liner is improved. Further, the ribs are lowered, and the cylinder liners can be brought closer to each other, and the cylinder block becomes smaller.

According to a second aspect of the present invention, when the cross-sectional area of the rib after the extrusion step is S1 and the cross-sectional area of the rib after the drawing step is S2, (S1−S2) / S1 is 5 to 12% in percentage. It is characterized by setting. If it is less than 5%, the inner diameter after drawing may be too large or conversely too small, and the variation in inner diameter after drawing is large. If it exceeds 12%, cracks tend to occur at the root of the rib after the drawing step. As a result, the lower limit is set to 5% from the viewpoint of the inner diameter accuracy after drawing, and the upper limit is set to 12% from the viewpoint of measures against cracks at the root of the rib after the drawing process.

According to a third aspect, when the height of the rib after the drawing step is Lh and the width of the tip of the rib is Lw, Lh <L.
w. The height Lh of the rib is L
Since h <Lw is set, the height of the ribs is small, and the cylinder liners can be closer to each other by that much,
The cylinder block becomes smaller.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a flowchart of a method for cast-injection molding of a cylinder liner according to the present invention, where ST indicates steps. ST01: An aluminum-based composite billet is manufactured by infiltrating an aluminum alloy into an oxide-based ceramic molded body. ST02: Extrude a billet to produce an extruded material in which a rib is formed on the outer surface of a cylinder. ST03: While extracting the extruded material, the rib is compressed to produce a drawn material having an undercut shape. ST04: Cut the drawn material to form a cylinder liner. ST05: The cylinder liner is set in the mold of the cylinder block and poured. Next, ST01 to ST05 will be specifically described.

FIG. 2 is a schematic structural view of an aluminum-based composite material manufacturing apparatus according to the present invention. The aluminum-based composite material manufacturing apparatus 10 includes an atmosphere furnace 11, a heating device 12 attached to the atmosphere furnace 11, A gas supply device 13 for supplying an inert gas to the atmosphere furnace 11 and a vacuum pump 14 for reducing the pressure in the atmosphere furnace 11 are provided. 15 and 16 are crucibles (crucibles). Specifically, the heating device 12 includes, for example, a control device 21, a temperature sensor 22, and a heating coil 23, and the gas supply device 13 includes an argon gas (Ar) 2
4 and a cylinder 27 of nitrogen gas (N ₂ ) 26.
And a pipe 28 for supplying the gas of the cylinders 25 and 27 to the atmosphere furnace 11, and a pressure gauge 29 provided on the pipe 28.
Consists of

The crucible 15 is a container for storing porous alumina (Al ₂ O ₃ ) 31 and an aluminum alloy 41 which are oxide ceramics, and the crucible 16 is a container for storing magnesium (Mg) 42. The aluminum alloy 41 is, for example, A6061. Magnesium (M
g) 42 may be a magnesium alloy.

FIGS. 3 (a) to 3 (d) are diagrams showing the procedure for producing the aluminum-based composite billet according to the present invention.
(C) schematically shows the process up to penetration. (A): First, an aluminum alloy 41 and magnesium (Mg) 42 are placed in a furnace together with alumina (Al ₂ O ₃ ) 31 which is an oxide ceramic. Specifically, alumina 31 is placed in crucible 15, aluminum alloy 41 is placed on alumina 31, and magnesium 4 is placed in crucible 16.
Insert 2.

Next, the inside of the atmosphere furnace 11 is evacuated to remove oxygen in the atmosphere furnace 11, and when a certain degree of vacuum is reached, the vacuum pump 14 is stopped and argon gas (Ar) 24 is supplied to the atmosphere furnace 11. Is supplied as shown by the arrow, and the heating coil 2
At 3, the heating of the porous alumina 31, the aluminum alloy 41 and the magnesium 42 is started as indicated by the arrow.

The temperature in the atmosphere furnace 11 is raised (automatically) while being detected by the temperature sensor 22. A predetermined temperature (for example, about 7
In the process of reaching 50 ° C. to about 900 ° C.), the aluminum alloy 41 melts. At the same time, magnesium (Mg) 42
Evaporates as indicated by the arrow. At that time, since the inside of the atmosphere furnace 11 is under the atmosphere of the argon gas (Ar) 24, the aluminum alloy 41 and the magnesium (Mg) 42 are not oxidized.

(B): Next, the inside of the atmosphere furnace 11 is pressurized,
Alumina (Al ₂ O ₃ ) 3 by the action of magnesium nitride 44
1 is reduced, and a molten metal of the aluminum alloy 41 is infiltrated into the porosity of the alumina 31 to produce an aluminum-based composite billet 45. Specifically, pressurization (for example, while supplying nitrogen gas (N ₂ ) 26 to the atmosphere furnace 11 as shown by arrows)
Atmospheric pressure + about 0.5 kg / cm ² ), and the atmosphere in the atmosphere furnace 11 is replaced with nitrogen gas (N ₂ ) 26.

When the atmosphere in the atmosphere furnace 11 is changed to an atmosphere of nitrogen gas (N ₂ ) 26, the nitrogen gas 26 contains magnesium (M ₂ ).
g) reacting with 42 and magnesium nitride (Mg ₃ N ₂ ) 44
Generate This magnesium nitride 44 is made of alumina (A
Since l ₂ O ₃ ) 31 is reduced, the alumina 31 has good wettability. As a result, the molten metal of the aluminum alloy 41 permeates into the porosity of the alumina 31. Aluminum alloy 41
Solidifies to complete the aluminum-based composite billet 45. In the infiltration process, if the inside of the atmosphere furnace 11 is placed under a pressurized atmosphere, the infiltration becomes faster, and the aluminum-based composite billet 45 can be manufactured in a short time. The pressure in the atmosphere furnace 11 is reduced by the vacuum pump 14, and the permeation can be performed in a short time even under a reduced-pressure nitrogen atmosphere.

(C): Aluminum-based composite billet 4
5 (hereinafter abbreviated as “billet 45”) is made of alumina 31 which is an oxide ceramic and aluminum alloy 4
1 is a composite material having excellent moldability and easy plastic deformation. (D): Finally, the billet 45 is cut to a predetermined size by an NC (numerical control) lathe 46. The dimensions are tailored to the downstream extrusion press.

FIG. 4 is an explanatory diagram of a billet homogenizing process according to the present invention. Next, the billet 45 is homogenized. In this homogenization process, the billet 45 is placed in the first heating furnace 5.
1 and heats for a long time at a high temperature by the first heat source 52. For example, the heating temperature is 510 ° C. to 530 ° C.
C and the holding time are set to 7 to 9 hours. By this step, components that are non-uniform, such as coarse intermetallic compounds generated in the aluminum-based composite material, can be homogenized to improve workability and mechanical properties.

FIG. 5 is a first explanatory view of the extrusion step according to the present invention. Subsequently, the billet 45 is annealed. In this annealing, the billet 45 is put into the second heating furnace 53, and the billet 45 is heated by the second heat source 54 for a desired temperature and time. As a standard at that time, the heating temperature is set to 300 ° C. or more, and the holding time is set to 1 hour or more. By this step, the billet 45 can be efficiently heated in advance, and the workability of extrusion can be improved.

FIG. 6 is a second explanatory view of the extrusion step according to the present invention. Next, the heated billet 45 is extruded. The billet 45 is inserted into a container 56 of a pre-heated extruder press 55 and extruded by a ram 57 to thereby form a die 5.
It is formed into an extruded material 61 by passing between 8 and the mandrel 59.

FIG. 7 is a perspective view of an extruded material according to the present invention. The extruded material 61 extruded by the extrusion press 55 is
2 and a plurality of ribs 63 formed on the outer surface of the cylinder 62.
It is long.

FIG. 8 is a view taken along the line 8-8 in FIG. The rib 63 is integrally formed radially from the outer surface of the cylinder 62 at a pitch angle θ. The height of the rib 63 is set to H, the thickness is set to t, and the cross-sectional area of the rib 63 is set to S1. Reference numeral 64 denotes a root portion of the rib 63, and reference numeral 65 denotes a tip portion of the rib 63. D1 indicates the inner diameter of the cylinder 62 after the extrusion.

FIG. 9 is an explanatory view of the solution treatment of the extruded material according to the present invention, and shows an example. Subsequently, the extruded material 6
1 is subjected to solution treatment. This solution treatment is a treatment in which the extruded material 61 is continuously put into a horizontal heating furnace 66 after being extruded, heated for a desired temperature and time, and then rapidly cooled. For example, the heating temperature is 510 ° C. to 530 ° C. , Retention time is 2
The solution treatment is performed in about an hour, and immediately thereafter, the solution is put into water in a water tank 67 and rapidly cooled. The equipment such as the horizontal heating furnace 66 and the water tank 67 is merely an example, and the equipment may be a vertical type, water may be set at a constant temperature, or a refrigerant other than water may be used.

FIGS. 10A and 10B are first explanatory views of the drawing step according to the present invention. (A): First, a grip portion is formed. Specifically, the extruded material 61 is provided with an aluminum tube 71.
As shown by the arrow. The aluminum tube 71 is a tube having an outer diameter d1 slightly smaller than the inner diameter D1 of the extruded material 61. Du indicates the outer diameter. (B) shows that the aluminum tube 71 was inserted up to the end face of the extruded material 61.

FIGS. 11 (a) to 11 (d) are second explanatory views of the drawing step according to the present invention. FIG. 11 (b) is a view taken in the direction of arrow b in FIG. 11 (a), and FIG. FIG. 4 is a sectional view taken along line dd. (A): The extruded material 61 is set on the press machine 72,
A predetermined range L1 (for example, 200 to 300 m from the end face)
m) is reduced in diameter.

(B): The die 73 is operated as indicated by the arrow (rotary forging: rotary swaging), and the die 7 is moved along with the aluminum pipe 71 in a predetermined range of the extruded material 61.
Press with 3 to make a small bite.

(C): The grip 74 is reduced in diameter (pre-attached)
By doing so, it is a part that can be passed through the hole of the drawing die. In the extruded material 61 and the aluminum tube 71,
A large stress is applied by the pressing force of the die, and the plastic deformation occurs. Since the aluminum tube 71 has good moldability, the aluminum pipe 71 presses the inner peripheral surface of the extruded material 61 as shown by the arrow while following the deformation of the extruded material 61 and resisting the pressing force of the die by elasticity.

(D): In the grip portion 74, the extruded material 61
The aluminum tube 71 is closely attached to the inner peripheral surface of the extruded material 61.
Is pressed as shown by an arrow, a compressive stress is generated in the surface layer on the inner surface of the extruded material 61, and the extruded material 6 is plastically deformed.
1 can be prevented from cracking.

FIGS. 12A and 12B are third explanatory views of the drawing step according to the present invention. (A): After the grip 74 is passed through the die 76 of the drawing device 75 (in the direction of the white arrow), the grip 77 is attached to the grip 74. Subsequently, the plug 7 is inserted into the extruded material 61.
Insert 8 as indicated by the arrow. Since the grip portion 74 is thickened by the aluminum tube 71, the tensile stress is reduced,
Cracking is less likely to occur during pulling.

(B): The gripper 77 is pulled, and the extruded material 6
1 is formed into a drawn material 81. Specifically, the grip 7
By pulling 7 as indicated by a white arrow, the inner and outer diameters of the extruded material 61 are given accuracy by passing between the die 76 and the plug 78, and the rib 63 is formed into an undercut shape. The molding will be described in detail with reference to the following drawings.

FIGS. 13 (a) and 13 (b) show one of FIG. 12 (b).
FIG. 13 is a sectional view taken along line 3-13. (A) shows the cross section of the drawn material 81, the inner diameter of which is finished to D2, and the sixteen ribs 63 are compressed from the tip side as shown by arrows to form inverted trapezoidal ribs 82, which are ribs after the drawing process. Indicates that you have done.

FIG. 4B is a detailed view of a portion b of FIG. 4A, showing an inverted trapezoidal rib 82. The inverted trapezoidal rib 82 is formed by compressing the two-dot chain line rib 63 from the tip side as shown by the arrow to form an undercut shape at the roots 64, 64 of the rib 63, and the height of the inverted trapezoidal rib 82 is Lh. When the width of the tip 83 of the inverted trapezoidal rib 82 is Lw, Lh <Lw is set. At that time, without applying a restraining force to the root portions 64, 64 so as to reduce the width of the root portion 64, the cylinder 6 as shown by an arrow
2 plastically deforms by the force of compressing in the center direction.

The cross-sectional reduction rate of the inverted trapezoidal rib 82 is 5 to 5.
It was set in the range of 12%. Here, the section reduction rate is Ra,
Assuming that the cross-sectional area of the rib 63 is S1 and the cross-sectional area of the rib after the drawing step, that is, the cross-sectional area of the inverted trapezoidal rib 82 is S2, the cross-sectional reduction rate Ra can be determined by the following equation. Ra (%) = [(S1−S2) / S1] × 100

FIG. 14 is a graph showing the relationship between the cross-sectional reduction rate and the inner diameter according to the present invention, wherein the horizontal axis is the cross-sectional reduction rate Ra, and the vertical axis is ΔD = Db-D3. Here, Db is the standard value of the internal diameter, D3 is the actual measured value of the internal diameter, and ΔD is the difference between the standard value of the internal diameter and the actual measured value. + Α is an allowable upper limit, and −α is an allowable lower limit.

When the cross-sectional reduction rate Ra is less than 5%, the inner diameter may increase as the value exceeds the allowable upper limit + α or decrease to near the allowable lower limit −α, and the variation in the inner diameter is large and the accuracy is not stable. If the cross-sectional reduction rate Ra exceeds 12%, cracks are likely to occur at the root 64 of the inverted trapezoidal rib 82. As a result, the lower limit is set to 5% from the viewpoint of the inner diameter accuracy of the drawn material 81, and the upper limit is set to 12% from the viewpoint of preventing the base 64 of the inverted trapezoidal rib 82 from cracking.

In the pulling-out step, the rib 63 formed by extrusion is compressed as shown by the arrow, while the root portion 64 is compressed.
Is plastically deformed without restraining the corners, stress concentration does not occur at the corners of approximately 90 °, and cracking of the root portion 64 can be prevented. In addition, since the ribs 63 formed by extrusion are plastically deformed without restraining the corners of the root portion 64 while compressing as shown by the arrows, stress concentration does not occur at approximately 90 ° corners, and the accuracy of the inner diameter is improved. Can be.

FIG. 15 is an explanatory view of an artificial age hardening treatment of a drawn material according to the present invention, and shows an example. In this artificial age hardening treatment, the drawn material 81 is placed in a third heating furnace 84, heated at a desired temperature for a desired time, and air-cooled. For example, the heating temperature is set to 170 ° C. to 180 ° C., and the holding time is set to about 8 hours.

FIG. 16 is an explanatory view of the cutting step according to the present invention. The drawn material 81 after the drawing is cut into a predetermined length Ls by a cutter 85 to form a cylinder liner 86 of an aluminum-based composite material. At this time, the end faces 87, 87 of the cylinder liner 86 are cut and finished at the same time.

FIG. 17 is an explanatory view of a casting process according to the present invention. Finally, the cylinder liners 86 are set in the mold 88 of the cylinder block and poured. In particular,
First, the cylinder liners 86 are connected to the liner support members 91.
And the liner support members 91.
By setting the cylinder liners 86... In the cast-in material attaching portions 92.

Subsequently, the molten metal is poured into the mold 88. in this case,
The molten aluminum alloy in the sleeve 94 of the die casting machine 93 to which the mold 88 is attached is filled into the cavity 95 of the mold 88 at a predetermined pressure. Aluminum alloy, for example,
JIS-ADC1 which is a kind of Al-Si-Cu alloy
2 is used. After the molten aluminum alloy has solidified, the cylinder block is taken out.

FIG. 18 is a perspective view of a cylinder block according to the present invention. The cylinder block 96 is a part of a water-cooled in-line four-cylinder engine, in which cylinder liners 86 are cast in a cylinder part 96a, and has a water jacket part 96b outside the cylinder part 96a. 96c ~
Reference numeral 96f indicates first to fourth cylinders.

FIG. 19 is a view taken along line 19-19 of FIG. In the cylinder block 96, the cylinder pitch was set to P as in the related art and was constant. in this way,
According to the method of the present invention, the height of the inverted trapezoidal rib 82 is Lh, the width of the tip 83 is Lw, and Lh is Lh.
<Lw, even if the cylinder pitch is P, the casting wall thickness between the cylinder liners 86.
The casting thickness can be increased more than the conventional casting thickness T2 between the cylinder liners, and the strength can be ensured. Therefore, the size of the cylinder block 96 can be reduced.

In addition, since the cylinder liners 86 are formed with the inverted trapezoidal ribs 82 and the cylinder liners 86 are formed by the cast-in method of the present invention, the undercut base portion is formed. At 64 ..., the molten aluminum alloy solidifies and the anchor effect can be improved.

Although the number of the ribs 63 in FIG. 8 shown in the embodiment of the present invention is set to 16, the number is not limited to 16. When the height of the rib after the drawing step is Lh and the width of the tip of the rib is Lw, Lh <Lw is set, but the invention is not limited to Lh <Lw. Although the cylinder liner is used for a water-cooled in-line four-cylinder, the engine is not limited to the in-line four-cylinder.

[0045]

According to the present invention, the following effects are exhibited by the above configuration. In claim 1, an aluminum alloy and a magnesium or magnesium generating source are placed in a furnace together with a porous formed body made of an oxide ceramic, and the oxide ceramic is reduced by the action of magnesium nitride. A step of manufacturing an aluminum-based composite billet by infiltrating a molten metal of aluminum alloy into a porous body, and an extrusion step of forming the aluminum-based composite billet into a cylinder by an extrusion press and simultaneously forming a rib on the outer surface of the cylinder, The extruded material after extrusion is finished with a drawing device, the rib is compressed from the tip side to form an undercut shape at the root of the rib, and the drawn material after drawing is cut into a predetermined length to form an aluminum base. A cutting process to form a composite cylinder liner, and a cylinder liner A casting step of pouring is set in a mold, made, at the same time shaping the billet into a tubular in an extrusion process, by molding the ribs on the outer surface of the tube, forming a rib in the shape of the first stage.

In the drawing step, the rib of the extruded material is compressed from the tip side to form an undercut shape at the root of the rib, so that stress is not concentrated at approximately 90 ° corners of the root and a crack may be formed from the root. There is no. Further, since the rib of the extruded material is compressed from the tip side to form an undercut shape at the root of the rib, the anchor effect of the cylinder liner can be improved. Further, the ribs are lowered, and the cylinder liners can be brought closer to each other, and the cylinder block can be reduced in size.

In the second aspect, when the cross-sectional area of the rib after the extrusion step is S1 and the cross-sectional area of the rib after the drawing step is S2, (S1-S2) / S1 is 5 to 12% in percentage.
Set to. If it is less than 5%, the inner diameter after drawing may be too large or conversely too small, and the variation in inner diameter after drawing is large. If it exceeds 12%, cracks tend to occur at the root of the rib after the drawing step. As a result, the lower limit is set to 5% from the viewpoint of the inner diameter accuracy after drawing, and the upper limit is set to 12% from the viewpoint of measures against cracks at the root of the rib after the drawing process. Therefore, the undercut shape can be formed at the root of the rib, and the accuracy of the inner diameter can be ensured.

According to the third aspect, when the height of the rib after the drawing step is Lh and the width of the tip of the rib is Lw, Lh <Lh
Since it is set to Lw, the height of the rib is small, so that the cylinder liners can be closer to each other, and the size of the cylinder block can be further reduced.

[Brief description of the drawings]

FIG. 1 is a flowchart of a cast-in molding method for a cylinder liner according to the present invention.

FIG. 2 is a schematic structural diagram of an apparatus for manufacturing an aluminum-based composite material according to the present invention.

FIG. 3 is a manufacturing procedure diagram of the aluminum-based composite billet according to the present invention.

FIG. 4 is an explanatory diagram of a billet homogenization process according to the present invention.

FIG. 5 is a first explanatory view of an extrusion process according to the present invention.

FIG. 6 is a second explanatory diagram of the extrusion process according to the present invention.

FIG. 7 is a perspective view of an extruded material according to the present invention.

8 is a view taken along the line 8-8 in FIG. 7;

FIG. 9 is an explanatory view of a solution treatment of an extruded material according to the present invention.

FIG. 10 is a first explanatory view of a drawing step according to the present invention.

FIG. 11 is a second explanatory view of the drawing step according to the present invention.

FIG. 12 is a third explanatory view of the drawing step according to the present invention.

FIG. 13 is a sectional view taken along line 13-13 of FIG.

FIG. 14 is a graph showing the relationship between the cross-sectional reduction rate and the inner diameter according to the present invention.

FIG. 15 is an explanatory view of an artificial age hardening treatment of a drawn material according to the present invention.

FIG. 16 is an explanatory view of a cutting step according to the present invention.

FIG. 17 is an explanatory view of a casting process according to the present invention.

FIG. 18 is a perspective view of a cylinder block according to the present invention.

FIG. 19 is a view taken in the direction of arrows 19-19 in FIG. 18;

FIG. 20 is an illustration of a conventional cylinder liner cast-in molding method.

[Explanation of symbols]

11: furnace (atmosphere furnace), 31: oxide ceramics (porous alumina), 41: aluminum alloy, 42 ...
Magnesium, 44: magnesium nitride, 45: aluminum-based composite billet, 55: extrusion press, 61:
Extruded material, 62 ... cylinder, 63 ... rib, 64 ... root, 65
... A tip, 75 ... Pull-out device, 81 ... Pull-out material, 82 ...
Rib (inverted trapezoidal rib) after drawing process, 86: cylinder liner, 88: cylinder block mold, 96: cylinder block, Ls: predetermined length.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B21C 23/10 B21C 23/10 4K020 B21J 5/00 B21J 5/00 D 5/06 5/06 B B21K 3 / 02 B21K 3/02 B22D 19/00 B22D 19/00 EG C22B 5/04 C22B 5/04 21/02 21/02 C22C 1/00 C22C 1/00 J S 1/202 501 1/02 501Z 503 503J 49/06 49/06 F02F 1/00 F02F 1/00 CEK (72) Inventor advantageous Sugaya 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. (72) Inventor Takashi Kato Saitama 1-10-1 Shin-Sayama, Sayama-shi Honda Engineering Co., Ltd. (72) Inventor Ryuji Echigo 1-10-1 Shin-Sayama, Sayama-shi, Saitama Within Aling Co., Ltd. (72) Inventor Satoshi Matsuura 1-10-1, Shinsayama, Sayama City, Saitama F-term (reference) in Honda Engineering Co., Ltd. 3G024 AA25 AA26 AA28 BA04 BA05 FA03 FA06 FA14 GA03 GA13 HA07 HA10 4E029 AA06 DA04 JA02 4E087 BA04 CA22 DB01 DB24 HA64 4E096 EA05 EA17 4K001 AA02 BA05 DA05 DA10 HA03 HA07 4K020 AA21 AC01 AC02 BB21 BB26 BC01

Claims (3)

[Claims] 1. An aluminum alloy and a magnesium or magnesium source are placed in a furnace together with a porous formed body made of an oxide ceramic, and the oxide ceramic is reduced by the action of magnesium nitride. A step of manufacturing an aluminum-based composite billet by infiltrating a molten aluminum alloy into a porous body; and an extrusion step of simultaneously forming the aluminum-based composite billet into a cylinder by an extrusion press and forming a rib on the outer surface of the cylinder. A finishing step of extruding the extruded material with a drawing device, compressing the rib from the tip side to form an undercut shape at the root of the rib, and cutting the drawn material after the drawing to a predetermined length. A cutting step of forming a cylinder liner of the aluminum-based composite material by using Cast molding method of the cylinder liner, wherein a casting step of pouring is set in a mold of cylinder block, in that it consists of. 2. The cross-sectional area of the rib after the extrusion step is S
1. The cylinder liner casting according to claim 1, wherein (S1−S2) / S1 is set to 5 to 12% in percentage, where S2 is the cross-sectional area of the rib after the drawing step. Wrap molding method. 3. The height of the rib after the drawing step is Lh,
2. The method according to claim 1, wherein Lh <Lw, where Lw is the width of the tip of the rib.