JPH1110314A - Device and method for producing light alloy composite member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently exhaust the air in pores in compositing member at the time of compositing without using a vacuum pump, etc., and to surely make the composite by arranging an interposing part of the compositing member and an exhaust passage of the air in the compositing member on the jointing surface part of a mold impregnating molten light alloy into the pores in the compositing member held in a cavity demarcated with the mold jointing. SOLUTION: Both mold jointing surfaces 12a, 13a are arranged in a annular form over almost the whole body of the compositing member 22 so as to correspond to the compositing member 22. On these mold jointing surface parts 12a, 13a, the mold jointing surfaces 12b, 13b mutually abutted with the mold jointing of each side mold 12 and an upper mold 13, are arranged and the interposing parts 12c, 13c for fixing and holding the compositing member 22 by interposing in the upper and the lower directions at the inner peripheral side of each mold jointing surface 12b, 13b. Further, the air exhaust passages 30, 30... for exhausting the air existing in the pores in the compositing member 22 at the time of compositing, are arranged at the outer peripheral side while connecting with the interposing parts 12c, 13c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for manufacturing a light alloy composite member, and more particularly to a method for manufacturing a light alloy molten metal in a pore of the composite member while holding the composite member having pores in a mold. , So that the molten metal and the member to be composited are composited.

[0002]

2. Description of the Related Art In general, light alloys such as aluminum alloys are lightweight and have good thermal conductivity, so they are often used in automobile engine parts and the like, but have the drawback of inferior strength and wear resistance. . Therefore, in order to strengthen only the parts where strength and wear resistance are required, for example, Japanese Patent Publication No. 2-307
As disclosed in Japanese Patent Publication No. 90-90 and Japanese Patent Publication No. 2-62776, a method of partially complexing a metal such as nickel or a fiber thereof, or a reinforcing material composed of ceramic fibers or particles is known. In this method, a composite member having pores therein is prepared in advance using the reinforcing material, and the composite member is formed by a high-pressure casting method in which a high pressure is applied to a molten aluminum alloy by a pressure punch, a plunger, or the like. The molten metal is impregnated in the pores to composite the member to be composited with the aluminum alloy.

However, in the above method, if air remains in the pores of the composite member, the molten metal is not completely impregnated in the pores, and a sound light alloy composite member cannot be obtained. In addition, it is required that the air existing in the pores of the composite member be satisfactorily discharged when the composite member is composited.

Therefore, conventionally, for example, Japanese Patent Publication No. 3-5061
As shown in Japanese Patent Publication No. 8 (1994), an air vent is provided in a portion of the mold that comes into contact with the member to be combined, and through this air vent, a vacuum pump is used to suction-fix the member to be combined into the mold, pour molten metal, and solidify. It has been proposed that the molten metal and the member to be composited be satisfactorily compounded by sucking air in the product cavity and the member to be composited.

[0005]

However, in the above proposed example, although a sound light alloy composite member can be obtained, a manufacturing apparatus for the light alloy composite member becomes large because a vacuum pump is required. At the same time, the cost is greatly increased.

On the other hand, if the air vent is simply provided in the mold, the position of the air vent is likely to be restricted due to the structure of the mold and the like, and air remains in a part of the member to be composited, and the air in the composite portion of the light alloy composite member. In some cases, defects or the like may occur due to entrainment, and there is a problem that stable composite formation cannot be performed stably.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to impregnate a light-alloy molten metal into a member to be composited as described above to combine the molten metal and the member to be composited. In addition, by devising the structure of the mold, it is possible to discharge the air in the pores of the compounded member well and to ensure the compounding when the molten metal and the compounded member are combined, without using a vacuum pump or the like. Is to do it.

[0008]

In order to attain the above object, according to the present invention, both mold mating surfaces of a mold are provided over substantially the entirety of a composite member so as to correspond to the composite member.
A clamping portion for clamping and holding the member to be composited by the mold matching of the mold, and a continuous arrangement of the clamping portion and the air in the member to be composited when the molten metal and the member to be composited are combined. And an air discharge passage for discharging air.

More specifically, according to the first aspect of the present invention, a product cavity is defined between the two dies by being matched with each other, and the composite member having pores is fixedly held in the product cavity. It is assumed that an apparatus for manufacturing a light alloy composite member is provided, which includes a mold capable of being filled with a molten alloy, and impregnates the molten metal into pores of the composite member to composite the molten metal and the composite member.

[0010] The two mold mating surfaces of the mold are provided over substantially the entirety of the complexed member so as to correspond to the complexed member. A holding portion for holding and holding the composite member in a fixed manner, and an air discharge passage which is disposed continuously with the holding portion and discharges air in the composite member when the molten metal and the composite member are combined. Shall be

Thus, the air discharge passage can be easily provided in any part of the mold-matching surface of the mold by cutting the mold-matching surface or the like. Since the composite member is set substantially along the entire member so as to extend substantially along the member, the air discharge passage can be set so that air in the pores of the composite member can be uniformly discharged. In addition, since the air discharge passage is provided continuously to the holding portion, one end of the air discharge passage can be substantially brought into contact with the member to be composited, and the air in the pores can be easily discharged. it can. For this reason, even if a vacuum pump is not used, the air in the pores of the composite member can be discharged without leaving a part thereof, and the molten metal can be completely impregnated in the pores. In addition, since the member to be combined is held by the holding portion, the member to be combined can be directly fixed and held by both types without providing a holding pin or the like. Therefore, while ensuring the holding of the composite member,
The molten metal and the composite member can be satisfactorily compounded, and the quality of the composite part of the light alloy composite member can be improved.

According to a second aspect of the present invention, in the first aspect of the present invention, a pressurizing means for pressurizing the molten metal and the composite member when the composite member is combined is provided.

According to the present invention, the molten metal can be reliably impregnated into the pores of the composite member while the air in the pores of the composite member is discharged by pressurization. Therefore, a more sound light alloy composite member can be obtained.

According to a third aspect of the present invention, in the second aspect, a sealing means for substantially sealing the product cavity of the mold or a pouring space into the product cavity in a state where the molten metal is filled in the product cavity. The pressurizing means is configured to pressurize the molten metal in the product cavity with gas in a state where the pouring space or the product cavity is sealed by the sealing means.

[0015] Since the molten metal and the composite member can be composited at a considerably lower pressure than in the high-pressure casting method, the manufacturing apparatus of the light alloy composite member can be simplified and downsized. In addition, even if the opening area of the air exhaust passage is increased, the pressure applied to the molten metal is low, so that after the air is exhausted, the molten metal enters the air exhaust passage and solidifies immediately, and the solidified molten air The exhaust passage is completely closed. Therefore, the air exhaust passage does not need to be set long so that the molten metal does not blow out to the outside, and the air can be satisfactorily exhausted while the manufacturing apparatus is further downsized. Therefore, the composite of the molten metal and the member to be composited can be reliably performed by a simple manufacturing apparatus.

According to a fourth aspect of the present invention, in the third aspect of the present invention, both the mating surfaces of the composite member and the mold are formed in a ring shape, and a plurality of air discharge passages are formed in a circle on the mold mating surface of the mold. Provided at substantially equal intervals in the circumferential direction, the pressurizing means is configured to blow gas into the product cavity from a position substantially on the center line of the composite member in the mold to press the molten metal in the product cavity. Shall be

In this way, the air in the pores of the composite member is uniformly discharged from the center of the composite member toward the outer periphery, so that no air remains in the composite member. . As a result, a defect or the like due to the entrainment of air does not occur in the composite portion of the light alloy composite member, and good composite can be always performed. Therefore, the quality of the composite part of the light alloy composite member can be stably improved.

According to a fifth aspect of the present invention, in the third or fourth aspect, the sealing means is configured to close a gate of the mold.

Thus, the pouring space or the inside of the product cavity can be easily sealed by closing the gate of the mold with the lid member or the like. Therefore, a specific configuration of the simple sealing means can be easily obtained.

According to a sixth aspect of the present invention, a light alloy melt is filled in a product cavity defined between both molds by mold matching in a mold while a composite member having pores is fixed and held. The invention is a method of manufacturing a light alloy composite member in which the molten metal and the composite member are composited by impregnating the composite into the pores of the composite member.

In the present invention, both mold mating surfaces of the mold are set over substantially the entirety of the complexed member so as to correspond to the complexed member. After the composite member is sandwiched and fixedly held by the mold mating surface portion, the molten metal is filled in the product cavity, and then the molten metal is discharged from the mold mating surface portion of the mold while discharging air in the composite member. And the composite member is composited. Thus, the same function and effect as the first aspect can be obtained.

According to a seventh aspect of the present invention, in the sixth aspect of the invention, the molten metal and the member to be composited are composited by pressing the molten metal. By doing so, the same operation and effect as those of the second aspect can be obtained.

According to an eighth aspect of the present invention, in the invention of the seventh aspect, after filling the molten metal into the product cavity, the product cavity of the mold or a space for pouring the product into the product cavity is substantially sealed. The molten metal in the cavity is pressurized by gas. Thus, claim 3
The same operation and effect as described above can be obtained.

According to a ninth aspect of the present invention, in the invention of the eighth aspect, both the mold mating surfaces of the member to be combined and the mold are formed in a ring shape, and the mold mating surfaces of the mold with respect to the entire circumferential direction. A gas is blown into the product cavity from a position substantially on the center line of the composite member while the air in the composite member is discharged so as to be even, so that the molten metal in the product cavity is pressurized. With this,
The same function and effect as the fourth aspect can be obtained.

According to a tenth aspect of the present invention, in the invention of the eighth or ninth aspect, the pouring space or the inside of the product cavity is sealed by closing the gate of the mold. According to this invention, the same function and effect as those of the fifth aspect can be obtained.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an apparatus A for manufacturing a light alloy composite member according to an embodiment of the present invention. This apparatus A is for manufacturing a piston 1 for an automobile engine as shown in FIG. It is. A top ring groove 3 for fitting a top ring, a secondary ring groove 4 for fitting a secondary ring, and an oil ring for fitting an oil ring on the outer peripheral portion in the upper part of the piston 1 in order from the top. Oil ring grooves 5 are formed. The piston 1 is made of an aluminum alloy (eg, AC8A defined in JIS H5202) as a light alloy, and only the periphery of the top ring groove 3 is made of the aluminum alloy and the nickel-chromium alloy. This is an aluminum-based alloy composite member having a composite portion 6 composited with a reinforcing material. In FIG. 5, reference numeral 7 denotes a piston pin insertion hole for inserting a piston pin for connecting the piston 1 and the connecting rod.
Reference numeral 8 denotes a ring-shaped cooling oil passage formed inside the piston 1 inside the composite portion 6.

Before the composite portion 6 of the piston 1 is composited with the aluminum-based alloy, as shown in FIG.
It has porosity (porosity of 80 to 95%, that is, volume ratio of 5-2
0%) The composite member 22 is formed of a ring-shaped porous metal body, and the pores of the composite member 22 are impregnated with an aluminum-based alloy. Note that the composite member 22 has an outer diameter larger than the outer diameter of the piston 1 and a groove corresponding to the top ring groove 3 is not formed on an outer peripheral portion thereof. Casting 9 in which composite member 22 and aluminum-based alloy are composited by A
(See FIG. 7)
It has a predetermined piston shape.

The manufacturing apparatus A is divided into two side molds 12 which are substantially symmetrical with respect to each of the mold mating surfaces 12a.
12 and the two side molds 12, 12 are mating surfaces 1.
The mold 11 includes a substantially cylindrical upper mold 13 and a middle mold 14 respectively inserted into the upper mold insertion hole 18 and the middle mold insertion hole 19 having a circular cross section formed in a state where they are matched in 2e. I have. The two side molds 12, 12 are matched with each other at the matching surfaces 12e, and the upper mold 13 and the middle mold 14 are completely inserted into the upper mold insertion holes 18 and the middle mold insertion holes 19, respectively. The space defined by the dies 12 to 14 is a product cavity 15 having substantially the same shape as the piston 1 (the casting 9 before cutting), and the molten aluminum 4 in the product cavity 15 is formed.
3 (see FIGS. 8 and 9), and the casting 9 is cast. The upper mold 13 and the middle mold 14 are configured to be slidable in the vertical direction, and the side molds 12 and 12 are slidable by a hydraulic cylinder (not shown) in a direction (perpendicular to the plane of FIG. 1) perpendicular to the respective mating surfaces 12e. And
When the casting is completed, the dies 12 to 14 are slid (opened) in a direction away from each other. FIG.
Reference numeral 17 denotes a cast pin for forming the piston pin insertion hole 7.

The bottom surface of the upper die insertion hole 18 in each side die 12 of the mold 11 has a surface 12a for mating with the upper die 13.
However, a lower surface of the upper die 13 is formed with a die mating surface 13a with each side die 12. The two mating surfaces 12a and 13a are set in a ring shape over substantially the entirety of the composite member 22 so as to correspond to the composite member 22, and the both mating surfaces 12a and 13a have Molding surfaces 12b and 13b that are in contact with each other by molding of the side molds 12 and the upper mold 13 are provided, respectively.
Further, the composite member 22 is provided on the inner peripheral side of each of the molding surfaces 12b and 13b.
12c, 13 for vertically holding and fixing the
c are provided respectively. That is, the holding portion 12c of each side mold 12 is formed so as to be recessed by substantially the same thickness as the composite member 22 below the mating surface 12b so that the outer peripheral surface of the composite member 22 is substantially fitted. On the other hand, the holding portion 13c of the upper mold 13 is formed on the same surface as the mating surface 13b. Each of the side molds 12 and the upper mold 13 is formed by the holding portions 12c and 13c.
When the molds are combined at b and 13b, the outer peripheral portion of the composite member 22 is vertically held and fixedly held.

A ring-shaped concave portion 12 d is formed on the outer peripheral side of the mold mating surface 12 b of each of the side dies 12, and the outer peripheral side surface in the concave portion 12 d is continuous with the inner peripheral surface of the upper die insertion hole 18. Is formed. On the other hand, a protrusion 13d is provided on the outer peripheral side of the upper surface 13 of the upper mold 13 so as to be protruded from the outer surface of the upper surface 13b. Is formed. Then, the inner peripheral side surface of the projection 13d is fitted to the outer peripheral side surface of the concave portion 12d of each of the side dies 12, whereby the upper die 13 is inserted into the upper die insertion holes 18 in both side dies 12, 12. The positioning in the radial direction is performed.

The holding surfaces 12a, 13a of the side dies 12 and the upper dies 13 are respectively provided on the holding portions 12a, 13a.
c, 13c and air existing in the pores of the composite member 22 when the melt 43 and the composite member 22 are composited as described later (the product cavity 1).
Eight air discharge passages 3 for discharging air (including air in 5)
, 0, 30,... Are provided. That is, as shown in detail in FIG. 3 and FIG.
b and a plurality of notches 12f, 12f,... which are cut out so as to extend in a radial direction and a vertical direction with a substantially constant width, respectively, on the inner peripheral side surface of the concave portion 12d. When each side mold 12 and the upper mold 13 are mated, each side mold 1 is formed by the notch 12f.
2 and a gap formed between the upper mold 13. The eight air discharge passages 30, 30,... Are provided at substantially equal intervals in the circumferential direction, so that the air in the pores is substantially uniformly discharged from each air discharge passage 30 to the composite member 22. It is supposed to be.

The air discharged from each of the air discharge passages 30 is supplied to the bottom surface and the outer peripheral side surface (the inner peripheral surface of the upper die insertion hole 18) of the concave portion 12d of each side die 12 and the protrusion 13d of the upper die 13.
Is discharged to the outside of the mold 11 from a gap between the lower surface and the outer peripheral side surface (the outer peripheral surface of the upper mold 13). Also,
After the air is discharged, the molten metal 43 enters each of the air discharge passages 30. Immediately after entering, the molten metal 43 cools and solidifies, and the respective air discharge passages 30 are sealed.

A ring-shaped salt core 23 for forming the cooling oil passage 8 can be held in the product cavity 15 of the mold 11. That is, a projection (not shown) is provided on the upper surface of the middle mold 14 so as to fit into a vertical through-hole (not shown) provided in the salt core 23, and this projection allows the salt core to be inserted. 23 is held at a position immediately inside the composite member 22.

A tapered surface for filling the aluminum alloy melt 43 into the mold 11 on the side of the upper mold insertion hole 18 on the upper side of the upper mold insertion hole 18 is formed on each of the mating surfaces 12 e of the both side molds 12, 12 of the mold 11. And a runner 2 connecting the spout 26 and the lower part of the product cavity 15
7 (pouring space). This bath 27
After extending downward from the sprue 26 with a circular cross section, it is bent at a substantially right angle toward the product cavity 15, extends horizontally, and is connected to the product cavity 15.

After filling the molten metal 43 into the product cavity 15 as described later, the gate 26 is covered with a closing member 37 slidable by a hydraulic cylinder (not shown) in the vertical direction above the gate 26. It has become. The closing member 37 has a taper surface having substantially the same shape as the taper surface of the sprue 26 at the lower part thereof, and the sprue 26 is completely closed by fitting the lower part thereof to the upper part of the sprue 26. At this time, the runner 27 or the inside of the product cavity 15 is in a substantially sealed state. That is, each of the air discharge passages 3
However, since the respective air discharge passages 30 are sealed with the molten metal 43 solidified as described above, the gate 26 is closed by the closing member 37 so that the runner 27 is closed. Alternatively, the inside of the product cavity 15 can be regarded as being sealed. Further, even if there is another place where the air in the runner 27 or the product cavity 15 leaks to the outside, the molten metal 4
3 is pressurized by air, the pressure required to completely impregnate the melt 43 into the pores of the composite member 22 is secured. Therefore, the closing member 37 constitutes a sealing means for substantially sealing the runner 27 or the product cavity 15 with the molten metal 43 filled in the product cavity 15.

In a substantially central portion of the lower portion of the upper mold 13 of the mold 11, a conical feeder space 1 having a diameter decreasing upward is formed.
3e is formed up to near the upper surface of the upper die 13. One end of a pipe 38 communicating with the feeder space 13e is connected to a substantially central portion of the upper portion of the upper die 13. The other end of the pipe 38 is connected to a pressurized air source (not shown) for producing factory air having a pressure in the range of 0.049 to 2.94 MPa (particularly preferably in the range of 0.049 to 0.98 MPa). )
It is connected to the. Then, with the runner 27 or the inside of the product cavity 15 sealed with the closing member 37,
Factory air is supplied from the pressurized air source to the feeder space 13e above the product cavity 15, and presses the molten metal 43 from the feeder space 13e. As a result, factory air (gas) is blown into the product cavity 15 from a position substantially on the center line of the composite member 22 by the pipe 38 and the pressurized air source, and the molten metal 43 in the product cavity 15 is blown.
Pressurizing means 39 configured to pressurize is provided. The molten metal 43 is combined with the composite member 22 by pressurizing the molten metal 43.

The pressure of the factory air is 0.049MP.
If it is smaller than a, it is difficult to satisfactorily combine the molten metal 43 and the composite member 22, while if it is larger than 2.94 MPa, the air discharge passages 30 and the two-sided molds 1 are used.
The molten metal 43 is formed from the gap between the respective mating surfaces 12e between
It is necessary to set each air discharge passage 30 to be long or to increase the mold clamping force in order to prevent the air from blowing out, so that the range is 0.049 to 2.94 MPa.

A method of manufacturing the piston 1 using the light alloy composite member manufacturing apparatus A having the above configuration will be described. First, while the upper die 13 and the closing member 37 of the mold 11 are slid upward, the composite member 22 is substantially fitted into the concave holding portion 12c of each side die 12, and the salt core 23 is moved to the middle die 13. To the projection. Then, upper mold 1
3 is inserted into the upper die insertion hole 18 so that the mating surface 13b is brought into contact with the mating surface 12b of each side mold 12. At this time, the inner peripheral side surface of the protruding portion 13 d located on the outer peripheral side with respect to the molding surface 13 b of the upper mold 13 is the molding surface 1 of each side mold 12.
The upper die 13 is fitted to the outer peripheral side surface of the concave portion 12d located on the outer peripheral side than 2b, and the upper die 13 is positioned in the radial direction with respect to the upper die insertion hole 18. Further, the composite member 22 is sandwiched and fixedly held by the sandwiching portions 12c and 13c of the side molds 12 and the upper mold 13.

Then, as shown in FIG. 8, the molten metal 43 of the aluminum alloy is
Or after being fed into the product cavity 15, the closing member 3
7 is slid down to close the gate 26 with its closing member 37.
Close with. At this time, as described above, the runner 27 or the inside of the product cavity 15 is in a substantially sealed state.

Subsequently, as shown in FIG. 9, factory air is supplied from the pressurized air source to the feeder space 13e above the product cavity 15 through the pipe 38 to supply the product cavity 15
The molten metal 43 inside is pressurized. Due to the pressurization, the molten metal 43 is impregnated into the pores of the composite member 22 while extruding the air that originally exists in the pores, and the molten metal 43 and the composite member 22 are composited. Then, the air pushed out by the molten metal 43 is applied to each air discharge passage 30 and each side mold 1.
It is discharged to the outside of the mold 11 through a gap between the bottom surface and the outer peripheral side surface of the second concave portion 12d and the lower surface and the outer peripheral side surface of the protrusion 13d of the upper die 13.

At this time, since each of the air discharge passages 30 is provided continuously to the holding portions 12c and 13c in each of the side molds 12 and the upper mold 13, one end of each of the air discharge passages 30 is connected to the composite member 22. And the air in the pores can be easily discharged. In addition, factory air is blown into the product cavity 15 from a position substantially on the center line of the ring-shaped composite member 22 to press the molten metal 43 in the product cavity 15, and a plurality of air discharge passages are provided. Are formed at substantially equal intervals in the circumferential direction, so that the air in the pores of the composite member 22 is uniformly discharged from the center of the composite member 22 toward the outer periphery. No air remains in the composite member 22. As a result, the composite of the molten metal 43 and the composite member 22 can always be satisfactorily performed, and the composite section 6 of the piston 1 does not have defects caused by air entrainment.

After the air in the pores of the composite member 22 is exhausted, the molten metal 43 enters each of the air discharge passages 30, and immediately thereafter, the molten metal 43 cools and solidifies, and the molten metal 43 flows through the respective air discharge passages 30. Sealing is performed, and the inside of the runner 27 or the product cavity 15 is sealed.

Next, after pressurizing the molten metal 43 as it is for a while, the pressurization is stopped and the molten metal 43 is cooled and solidified. Thereafter, the closing member 37 is slid upward, and the upper mold 13, the middle mold 14, and both side molds 12, 12 are formed.
Are respectively slid to open the mold, and the cast product 9 is taken out of the mold 11. At this time, as shown in FIG. 7, in the casting 9, the top ring groove 3, the secondary ring groove 4, and the oil ring groove 5 were not formed, and the outer peripheral portion of the composite member 22 protruded from the periphery. In state. After subjecting the casting 9 to the T6 heat treatment, a mechanical cutting process is performed. That is, the entire outer peripheral portion of the casting 9 and the upper protruding portion formed by the feeder space 13e are cut,
Thereafter, the top ring groove 3, the secondary ring groove 4, and the oil ring groove 5 are formed by cutting. Further, a hole is drilled from the lower side of the casting 9 to the location of the salt core 23, and water is supplied to the hole to dissolve the salt core in the water, thereby forming the cooling oil passage 8. Thus, the piston 1 having the composite portion 6 around the top ring groove 3 is completed.

Therefore, in the above embodiment, the mold 11
Both molds 12a of both side mold 12 and upper mold 13
13a is set in a ring shape over substantially the entirety of the compounded member 22 so as to correspond to the ring-shaped compounded member 22, and each of the side dies 12 and the upper die is provided on the matching surface portions 12a and 13a. 13, holding portions 12c, 13c for holding and holding the composite member 22 in a fixed manner, and are disposed continuously to the holding portions 12c, 13c, and are used to combine the molten metal 43 and the composite member 22 when the composite member 22 is combined. A plurality of air discharge passages 30, 30, ... for discharging the air in 22 are provided,
The air discharge passages 30 are set at equal intervals in the circumferential direction so that air in the pores of the composite member 22 can be uniformly discharged, so that the molten metal 43 and the composite member 22 can be stably and favorably formed. It can be compounded. In addition, since each air discharge passage 30 only has a cutout in the mating surface 12b of each side mold 12, it can be easily provided at any position in the circumferential direction in both mold mating surfaces 12a and 13a. Therefore, the air in the pores of the composite member 22 can be completely discharged with a simple configuration without using a vacuum pump. Further, since the composite member 22 is sandwiched by the clamping portions 12c, 13c of the side dies 12 and the upper mold 13, the composite member 22 is directly held by the two dies 12, 13 without providing a holding pin or the like. Can be fixedly held.
Therefore, while securely fixing and holding the composite member 22,
The molten metal 43 and the composite member 22 can be easily completely composited, and the quality of the composite portion 6 of the piston 1 can be stably improved.

Further, since the pressurizing means 39 is configured to press the molten metal 43 in the runner 27 or the product cavity 15 with factory air, the high-pressure casting method (29.4 MPa) is used.
), The molten metal 43 and the composite member 22 can be combined at a considerably low pressure of 0.049 to 2.94 MPa, and the manufacturing apparatus A can be simplified and downsized. Moreover, even if the opening area of each air exhaust passage 30 is increased, the pressure applied to the molten metal 43 is low, so that after the air in the pores of the composite member 22 has been exhausted, the molten metal flows into each air exhaust passage 30. Even if it enters, it solidifies immediately and the molten metal 43
Does not blow out from each air exhaust passage 30.
For this reason, it is not necessary to set each air exhaust passage 30 to be long, and it is possible to further reduce the size of the manufacturing apparatus A,
Air in the pores can be satisfactorily exhausted. Therefore, the manufacturing apparatus can be further simplified.

In the above embodiment, the pipe 38 from the pressurized air source is connected to the upper die 13 to press the molten metal 43 from the feeder space 13e above the product cavity 15, but the gate 26 is closed. The pipe 38 is attached to the closing member 37 to be closed.
May be connected to pressurize the molten metal 43 from the side of the runner 27. Even in this case, since the molten metal 43 has the same pressure in any part, the same operation and effect as in the above embodiment can be obtained. However, in practice, it is more desirable to press the molten metal 43 from the feeder space 13e as in the above-described embodiment, because the pressure of the molten metal 43 is hardly lost when the pressure is applied from the vicinity of the composite member 22. .

Although the molten metal 43 is pressurized by the factory air, the present invention can be applied to a case where a high pressure is applied to the molten metal 43 by a punch or a plunger as in a high pressure casting method.

Further, in the above embodiment, the composite member 2
Although 2 is a porous metal body made of a nickel-chromium alloy, the present invention is not limited to this, and may be an inorganic porous body or a molded body made of metal fibers, ceramic fibers, or particles.

The base material of the piston 1 is
The present invention can be applied to other light alloys such as a magnesium alloy in the case of manufacturing another component made of a light alloy composite member.

[0050]

As described above, according to the first or sixth aspect of the present invention, a product cavity is defined between the two dies by being matched, and a composite member having pores in the product cavity is formed. An apparatus for manufacturing a light alloy composite member, comprising a mold capable of being filled with a light alloy melt in a fixed and held state, wherein the melt is impregnated into the pores of the composite member to combine the melt and the composite member. On the other hand, both mold mating surfaces of the mold are provided over substantially the entirety of the complexed member so as to correspond to the complexed member, and the complexed member is clamped and fixedly held on the mold matching surface by mold matching of the mold. A holding portion to be held by the holding portion and an air discharge passage that is disposed continuously to the holding portion and that discharges air in the member to be combined when the molten metal and the member to be combined are combined. Of molten metal Can be carried out satisfactorily composite of the composite member, it is possible to improve of the quality in the composite portion of the light alloy composite member.

According to the second or seventh aspect of the present invention, when the molten metal and the member to be composited are combined with each other, a pressurizing means for pressurizing the molten metal is provided, so that a lighter light alloy composite member can be obtained. it can.

According to the third or eighth aspect of the present invention, there is provided a sealing means for substantially sealing the product cavity of the mold or a pouring space into the product cavity in a state where the molten metal is filled in the product cavity. The means is configured such that the molten metal in the product cavity is pressurized with gas while the pouring space or the inside of the product cavity is sealed by the sealing means, so that the molten metal and the composite member can be combined by a simple manufacturing apparatus. Can be ensured.

According to the fourth or ninth aspect of the present invention, the mold mating surfaces of the member to be combined and the mold are formed in a ring shape, and a plurality of air discharge passages are formed in the mold mating surfaces of the mold in a circumferential direction. By providing the pressurizing means at equal intervals and by pressurizing the molten metal in the product cavity by blowing gas into the product cavity from a position substantially on the center line of the composite member in the mold, It is possible to stably improve the quality of the composite part of the member.

According to the fifth or tenth aspect of the present invention, since the sealing means is configured to close the gate of the mold, a specific structure of the simple sealing means can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an apparatus for manufacturing a light alloy composite member according to an embodiment of the present invention.

FIG. 2 is a top view of a double-sided die showing a die mating surface portion with the upper die.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a front view showing a main part of an automobile engine piston.

FIG. 6 is a perspective view showing a composite member.

FIG. 7 is a cross-sectional view showing a main part of a casting immediately after casting by a manufacturing apparatus.

FIG. 8 is a diagram corresponding to FIG. 1, showing a state in which the molten metal is being fed from the gate to the runner or the product cavity.

FIG. 9 is a view corresponding to FIG. 1, showing a state in which the molten metal in the product cavity is pressurized by closing the gate with a closing member.

[Explanation of symbols]

Reference Signs List A Manufacturing apparatus for light alloy composite member 1 Piston for automobile engine (aluminum alloy composite member) 6 Composite part 11 Mold 12 Side mold 12a, 13a Mold matching surface part 12c, 13c Clamping part 13 Upper mold 15 Product cavity 22 Coated member 26 Gate 27 Runner (pouring space) 30 Air discharge passage 37 Closure member (sealing means) 38 Pipe 39 Pressurizing means 43 Molten metal

Claims (10)

[Claims] 1. A mold which can be filled with a light alloy melt in a state where a product cavity is defined between both dies by being matched, and a composite member having pores is fixed and held in the product cavity. In the apparatus for manufacturing a light alloy composite member, in which the molten metal is impregnated into pores of the composite member to composite the molten metal and the composite member, both mold mating surfaces of the mold correspond to the composite member. The composite member is provided over substantially the entirety of the member to be composited, and a clamping portion for clamping and fixing and holding the composite member by mold matching of the mold is provided on the mold matching surface portion. An apparatus for manufacturing a light alloy composite member, comprising: an air discharge passage arranged to discharge air in the composite member when the molten metal and the composite member are combined. 2. A light alloy composite member manufacturing apparatus according to claim 1, further comprising a pressurizing means for pressurizing the molten metal and a composite member when the composite material is combined. Manufacturing equipment. 3. The apparatus for manufacturing a light alloy composite member according to claim 2, wherein the molten metal is filled in the product cavity, and the product cavity of the mold or a pouring space into the product cavity is substantially sealed. A light alloy composite, wherein the pressurizing means is configured to pressurize the molten metal in the product cavity with a gas while the pouring space or the product cavity is sealed by the sealing means. Equipment for manufacturing components. 4. The apparatus for manufacturing a light alloy composite member according to claim 3, wherein both the mating surfaces of the composite member and the mold are formed in a ring shape, and a plurality of air discharge passages are formed in the mold mating surfaces of the mold. The pressurizing means is configured to blow gas into the product cavity from a position substantially on the center line of the composite member in the mold to press the molten metal in the product cavity. An apparatus for manufacturing a light alloy composite member, comprising: 5. The apparatus for manufacturing a light alloy composite member according to claim 3, wherein the sealing means is configured to close a gate of the mold. 6. A light alloy melt is filled in a product cavity defined between both molds by mold matching in a mold while a composite member having pores is fixed and held, and the molten metal is mixed with the composite member. In the method for producing a light alloy composite member in which the molten metal and the composite member are composited by impregnating into the pores, substantially the entirety of the composite member is formed so that both mold mating surfaces of the mold correspond to the composite member. After the composite member is sandwiched and fixed and held by the mold mating surface portion of the mold at the time of the mold matching, the molten metal is filled in the product cavity. A method for manufacturing a light alloy composite member, wherein the molten metal and the composite member are composited while discharging air in the composite member from the mold fitting surface. 7. The method for producing a light alloy composite member according to claim 6, wherein the molten metal and the member to be composited are composited by pressurizing the molten metal. 8. The method for producing a light alloy composite member according to claim 7, wherein after filling the molten metal into the product cavity, the product cavity of the mold or a pouring space into the product cavity is substantially sealed. And a method of manufacturing a light alloy composite member, wherein the molten metal in the product cavity is pressurized by gas. 9. The method for manufacturing a light alloy composite member according to claim 8, wherein both the mold mating surfaces of the member to be compounded and the mold are formed in a ring shape, and the mold mating surfaces of the mold are entirely formed in the circumferential direction. Gas is blown into the product cavity from a position substantially on the center line of the compounded member in the mold while the air in the compounded member is discharged so as to be even with respect to the molten metal, and the molten metal in the product cavity is pressurized. A method for producing a light alloy composite member. 10. The method of manufacturing a light alloy composite member according to claim 8, wherein a pouring space or a product cavity is sealed by closing a mold gate. Production method.