JP2784087B2 - Casting equipment for fiber reinforced metal cylinder blocks - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fiber reinforced metal cylinder block casting apparatus formed by casting a fiber reinforced metal sleeve into a cylinder block.

(Prior Art) Conventionally, as disclosed in JP-A-62-161457 and JP-A-62-81247, a casting device for a fiber-reinforced metal cylinder block is provided with a cavity corresponding to the upper shape of the cylinder block. An upper die having a concave portion on the upper side, a side die having a cavity corresponding to the side shape of the cylinder block, and a cavity having a cavity corresponding to the lower shape of the cylinder block, and an aluminum alloy or the like in each cavity. And a lower mold having a runner for injecting the molten metal under pressure. The upper die is provided with a plurality of gas vent holes communicating with the concave portions. The gas vent hole is provided with a gas vent pin inserted therein, and a plurality of grooves formed in the outer surface of the gas vent pin in the longitudinal direction, between the gas vent hole and the inner peripheral surface of the gas vent hole. A gas vent passage is formed. As a result, air or the like remaining in the cavity when the molten metal is injected into the cavity passes through the degassing passage and escapes to the outside. At this time, since the cross-sectional area of the degassing passage is formed small by the degassing pin, pressure leakage during pressure casting is suppressed. The insert supporting portion formed on the upper die is provided with a bore insert that projects into the cavity and corresponds to the internal shape of the cylinder block. A fiber-reinforced metal sleeve made of, for example, silicon nitride fiber and an aluminum alloy is inserted into the bore insert.

As a result, the cavity of each mold is filled with the molten metal, and the fiber-reinforced metal cylinder block in which the fiber-reinforced metal sleeve is cast on the inner surface of the bore of the cylinder block is cast. At this time, the air gathered in the concave portion of the upper die is dispersed from the tip of the degassing pin and is released from the degassing hole, thereby preventing the air inside the cavity from remaining and the nest or the like after the molten metal is solidified. Is prevented from occurring.

However, when the molten metal is injected into the cavity, the air in the fiber-reinforced metal sleeve is difficult to escape, and a large amount of air may remain in the sleeve and impede the permeation of the molten metal. For this reason, not only does the melt flow into the sleeve not become uniform, but also the weldability between the melt and the sleeve is reduced, and the quality of the fiber-reinforced metal cylinder block is not stable.

(Problems to be Solved by the Invention) The present invention solves such inconvenience and improves the quality by forcibly removing air in the fiber-reinforced metal sleeve and promoting the penetration of the molten metal into the sleeve. It is an object of the present invention to provide an apparatus for casting a fiber-reinforced metal cylinder block that can be used.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an upper mold for forming a cavity corresponding to an upper shape of a cylinder block, and a side for forming a cavity corresponding to a side shape of the cylinder block. A mold, a lower mold having cavities corresponding to the lower shape of the cylinder block and having a runner for injecting a molten metal into each cavity under pressure, and supported by an insert supporting portion provided on the upper mold. A bore insert corresponding to the internal shape of the cylinder block provided to protrude into a cavity formed by the upper mold, the side mold, and the lower mold, and a fiber-reinforced metal sleeve is mounted on the bore insert. In a fiber reinforced metal cylinder block casting apparatus for supporting and casting the fiber reinforced metal sleeve into the bore inner surface of the cylinder block, the fiber reinforced metal is inserted into the bore insert. When the sleeve made of fiber is supported, a vent hole is provided for connecting the upper side of the fiber-reinforced metal sleeve to the outside, and the air inside the cavity is forcibly connected to the vent hole to force the air in the cavity from the top of the sleeve made of metal. A forced aspirator, which is provided with an air compressor, an intake nozzle, and an exhaust port.The aspirator is provided with the gas vent hole connected to the intake nozzle. An opening / closing valve for shutting off ventilation is provided at an exhaust port of the aspirator.

(Function) When the molten metal is pressure-injected into the cavity formed by the upper die having the bore insert provided with the fiber-reinforced metal sleeve and the side die and the lower die by the means, the fiber reinforcement is simultaneously performed. The forced exhaust means forcibly exhausts the air in the cavity, particularly in the fiber-reinforced metal sleeve and its vicinity from the upper part of the metal sleeve through the vent hole. This prevents the air from remaining in and around the fiber-reinforced metal sleeve and promotes the permeation of the molten metal.

Also, the forced exhaust means is constituted by an aspirator, the gas vent hole is connected to the intake nozzle, and an opening / closing valve for shutting off the ventilation is provided at the exhaust port, thereby simplifying the structure and eliminating air in the cavity. And air can easily be injected into the cavity. That is, when removing the air in the cavity, the on-off valve of the exhaust port is opened, and an airflow toward the exhaust port is generated by the compressor. This allows
The air in the cavity is forcibly removed from the intake nozzle via the vent hole, and is discharged from the exhaust port.

Further, when air is injected in the direction of the cavity, for example, when removing molten metal that has entered the gas vent hole and solidified, the on-off valve of the exhaust port is closed. At this time, air is forcibly sent to the gas vent hole to discharge solidified molten metal present in the gas vent hole.

(Example) An example of the present invention will be described with reference to the drawings.

 FIG. 1 is an explanatory sectional view of the present embodiment.

The present embodiment is a casting apparatus for casting a fiber reinforced metal cylinder block in which a fiber reinforced metal sleeve is cast on the inner surface of a cylinder.

1 is an upper die for forming a cavity 1a corresponding to the upper shape of the cylinder block cast by the present embodiment.
Is a side mold that forms a cavity 2a corresponding to the side shape of the cylinder block, and 3 is a cavity that forms a cavity 3a corresponding to the lower shape of the cylinder block.
A lower mold 5 having a runner 4 for pressure-injecting a molten metal of an aluminum alloy, which is a material of a cylinder block, into 1a, 2a, 3a, and a bore mold 5 supported by a nest support 6 provided on the upper mold 1 Child, 7
Is a forced exhaust device for forcibly removing air in the cavities 1a, 2a, 3a.

As shown in FIG. 1, the bore insert 5 supports a fiber-reinforced metal sleeve 8 made of silicon nitride fiber and an aluminum alloy. In addition, each cavity 1a, 2a, 3a
A sand core 9 for forming a water jacket of the cylinder block is provided in the space formed by the side mold 2.

 Next, each part will be described in detail.

The bore insert 5 is formed in a substantially cylindrical shape, and a flange-shaped engaging portion 10 for engaging the insert grip portion 6 of the upper mold 1 is formed at an upper portion thereof. A groove 11 is formed over the entire periphery of the portion below the locking portion 10 and in contact with the upper mold 1, and a portion of the part below the groove 11 and in contact with the upper mold 1 is formed around the entire periphery. A plurality of ventilation grooves 12 are formed at equal intervals and communicate with the concave groove 11 and the cavities 1a, 2a, 3a. A cylindrical fiber-reinforced metal sleeve 8 is supported at a portion protruding from each cavity 1a, 2a, 3a below the ventilation groove 12. The ventilation groove 12 forms a gas vent hole with the inner surface of the nesting support 6 of the upper die 1. As a result, the air in each of the cavities 1a, 2a, 3a can be discharged from directly above the fiber-reinforced metal sleeve 8 supported by the bore insert 5.

Further, the concave groove 11 is connected to the forced exhaust device 7 through a first illustrated ventilation hole 13 formed in the upper die 1.

As shown in FIG. 1, the forced elimination device 7 is constituted by an aspirator including an air compressor 14, an intake nozzle 15, and an exhaust port 16. An opening / closing valve 17 for shutting off ventilation is provided at an exhaust port 16 of the aspirator. The on-off valve 17 is formed in a disk shape corresponding to the inner diameter of the exhaust port 16, and is rotatably supported by a support shaft 18 provided on the wall surface of the exhaust port 16. Rotated. On the other hand, the concave groove 11 provided in the bore insert 5 is connected to an intake nozzle 15 of the aspirator through a vent hole 13, and the compressor 14 generates an airflow toward the exhaust port 16 by the compressor 14. By opening and closing the on-off valve 17, the direction of the airflow passing through the intake nozzle 15 can be changed. That is, when the on-off valve 17 is opened as shown by the phantom line in FIG. 1, an airflow flowing outward from the outlet 16 generates an airflow toward the outlet 16 at the intake nozzle 15, Via the concave groove 11 of the bore insert 5 and each ventilation groove 12, the cavities 1a, 2a,
The air in 3a is forcibly removed and discharged from the exhaust port 16. When the on-off valve 17 is closed, the airflow generated by the compressor 14 is prevented from being discharged from the outlet 16 and flows from the intake nozzle 15 into the cavities 1a, 2a, 3a.

Next, the casting of the cylinder block by the thus-configured first embodiment of the present invention will be described.

First, a molten aluminum alloy is injected under pressure from the runner 4 of the lower mold 3. At the same time, the on-off valve 17 is opened, and the compressor 14 of the forced exhaust device 7 generates an airflow in the direction of the exhaust port 16. At this time, the cavity
The air in 1a, 2a, and 3a is forcibly removed by the exhaust of the forced exhaust device 7, and in particular, a plurality of the ventilation grooves 12 are provided at equal intervals on the upper portion of the fiber-reinforced metal sleeve 8. As a result, the air inside the fiber reinforced metal sleeve 8 and the air in the vicinity thereof are forcibly and uniformly eliminated. This prevents the air from remaining inside the fiber reinforced metal sleeve 8 and promotes the permeation of the molten metal into the fiber reinforced metal sleeve 8, thereby preventing cavities and the like from being generated. , 2a and 3a are uniformly filled with the molten metal.

Thereafter, the molten metal in the cavities 1a, 2a, 3a solidifies to form a cylinder block. When the molten metal that has entered the ventilation groove 12 and solidified is removed, the on-off valve 17 of the forced exhaust device 7 is rotated to close the exhaust port 16.
At this time, the airflow generated by the compressor is pumped from the intake nozzle 15 toward the ventilation groove 12. This makes it possible to easily remove the molten metal that has solidified in the state where the ventilation groove 12 has been clogged.

(Effects of the Invention) As is clear from the above, in the present invention, the air in the cavity is forcibly discharged to the outside by the forcible exhaust means from the upper part of the fiber-reinforced metal sleeve through the gas vent hole. . Thereby, the circulation of the molten metal into the cavity can be promoted. And by providing the gas vent hole at a position directly above the fiber-reinforced metal sleeve,
The air inside the fiber reinforced metal sleeve and the vicinity thereof is forcibly removed, so that the occurrence of nests or the like due to the remaining air in the fiber reinforced metal sleeve can be prevented, and the permeation of the molten metal can be promoted.

Further, since the on-off valve is provided at the exhaust port of the aspirator provided in the forcible exhaust means of the present invention, the on-off valve can be opened and the air in the cavity can be eliminated through the gas vent hole, With the on-off valve closed, air can be pumped into the vent hole. As a result, not only can the on-off valve be opened to forcibly remove air in the cavity and the fiber-reinforced metal sleeve, but also by closing the on-off valve, the gas enters the gas vent hole and solidifies. The molten metal can be easily and quickly removed.

Therefore, according to the present invention, a fiber-reinforced metal cylinder block capable of improving the quality by forcibly removing air in the fiber-reinforced metal sleeve and promoting the penetration of the molten metal into the sleeve is provided. A casting device can be provided.

[Brief description of the drawings]

 FIG. 1 is an explanatory sectional view of the present embodiment. DESCRIPTION OF SYMBOLS 1 ... Upper mold 2 ... Side mold 3 ... Lower mold 1a, 2a, 3a ... Cavity 4 ... Runner 5 ... Bore insert 6 ... Insert support part 7 ... Forced exhaust device (forced exhaust) Means) 8: Fiber-reinforced metal sleeve 12: Vent groove (gas vent hole) 14: Air compressor 15: Intake nozzle 16: Exhaust port 17: On-off valve

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Taichi Mitsuo 1-10-1, Shinsayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. (56) References JP-A-62-282760 (JP, A) Hei 1-258858 (JP, A) JP-A-60-99468 (JP, A) JP-A-63-242458 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B22D 17 / 00 B22D 17/22 B22D 19/08 F02F 1/00

Claims (1)

(57) [Claims] An upper die forming a cavity corresponding to an upper shape of a cylinder block, a side die forming a cavity corresponding to a side shape of the cylinder block, and a cavity corresponding to a lower shape of the cylinder block. A lower mold having a runner formed and having a runner for injecting a molten metal into each cavity under pressure; and a cavity formed by the upper mold, the side mold, and the lower mold supported by a nest support portion provided on the upper mold. And a bore insert corresponding to the internal shape of the cylinder block protruding from the cylinder block. A fiber-reinforced metal sleeve is mounted on the bore insert and supported, and the fiber reinforcement is attached to the bore inner surface of the cylinder block. In a fiber reinforced metal cylinder block casting apparatus for casting a metal sleeve, when the fiber reinforced metal sleeve is supported in the bore insert, the fiber reinforced metal three A gas vent hole communicating the upper side of the fiber with the outside, and forced exhaust means connected to the gas vent hole for forcibly removing air in the cavity from the upper portion of the fiber reinforced metal sleeve, The means includes an aspirator including an air compressor, an intake nozzle, and an exhaust port, is provided with the gas vent hole connected to the intake nozzle of the aspirator, and an opening / closing valve that shuts off ventilation at the exhaust port of the aspirator. A cylinder block made of fiber-reinforced metal.