JPH0635037B2 - Hot water supply method for injection sleeve of casting machine - Google Patents

Description

Detailed Description of the Invention A. OBJECTS OF THE INVENTION (1) Industrial field of application The present invention relates to a casting machine, and in particular to a vertically movable upper mold; a cavity having an upward opening for defining a casting molding cavity in cooperation with the upper mold. A lower mold having; an injection sleeve provided on the lower mold with its axis oriented in the vertical direction to inject the molten metal into the cavity from below the cavity; and to supply the molten metal into the injection sleeve. The present invention relates to a method for supplying hot water to an injection sleeve of a casting machine including a hot water supply passage provided in a lower mold.

(2) Conventional Technology Conventionally, when hot water is supplied to the injection sleeve, the upper mold located at the mold opening position is lowered, and the upper mold is used to close the opening of the cavity to hold the upper mold at the mold closing position. Then, the molten metal is supplied to the injection sleeve through the hot water supply passage, and then the hot water supply passage is closed.

(3) Problems to be Solved by the Invention As described above, the reason for supplying the molten metal after closing the mold is to prevent an improper running due to a decrease in the temperature of the molten metal by moving to the injection step immediately after supplying the molten metal. However, if the molten metal is supplied while the mold is closed, the gas generated by the reaction between the mold release agent applied to the inner peripheral surface of the injection sleeve and the molten metal, and the gas such as steam in the injection sleeve will be sufficiently discharged. There is a problem in that the gas cannot be discharged, and as a result, the gas is entrained in the molten metal in the injection process, causing casting defects such as voids.

Further, if the mold closing work and the molten metal supply work are performed separately, there is a problem that the casting work is inefficient and the productivity of the casting is poor.

In view of the above, it is an object of the present invention to provide the hot water supply method capable of improving the casting work efficiency and sufficiently discharging the gas generated in the injection sleeve.

B. Configuration of the Invention (1) Means for Solving the Problems The present invention includes a first step of lowering the upper mold in a mold opening position and supplying molten metal to the injection sleeve through the hot water supply passage; Immediately before the upper die closes the opening of the void, a second step of temporarily stopping the upper die and completing the supply of the molten metal to the injection sleeve; and a state in which the hot water supply passage is open to the atmosphere. A third step of closing the opening of the void by the upper mold to hold the upper mold in the mold closing position; and a fourth step of closing the hot water supply passage;
Are carried out in this order.

(2) Operation According to the above method, the mold closing work and the molten metal supply work proceed at the same time, and the mold closing is completed following the completion of the supply of the melt to the injection sleeve. As a result, it is possible to improve the efficiency of casting work and improve the productivity of castings.

Further, since the opening of the void is open from the start of the supply of the molten metal to the injection sleeve to immediately after the completion of the injection, the gas generated in the injection sleeve is efficiently discharged from the opening through the void. After the completion of the molten metal in the injection sleeve, the gas in the injection sleeve is discharged through the hot water supply passage because the hot water supply passage is open to the atmosphere when the opening of the cavity is closed by the upper mold.

This makes it possible to prevent the occurrence of casting defects caused by the gas.

(3) Examples FIGS. 1 to 4 show an aluminum alloy-made Siamese type cylinder block S as a casting, and the cylinder block S is a plurality of cylinder barrels 1 ₁ to 1 ₄ arranged in series. It comprises a Siamese cylinder barrel 1 which is connected to each other, an outer wall portion 2 which surrounds the Siamese cylinder barrel 1, and a crankcase 3 which is connected to the lower edges of the Siamese cylinder barrel 1 and the outer wall portion 2. Each cylinder barrel 1 ₁ to 1 ₄ cast iron sleeve 5 defining a cylinder bore 4 to have been cast Guruma.

A water jacket 6 facing the outer circumference of the Siamese cylinder barrel 1 is formed between the Siamese cylinder barrel 1 and the outer wall portion 2. At the end portion of the water jacket 6 on the cylinder head side, the Siamese cylinder barrel 1 and the outer wall portion 2 are partially connected by a plurality of reinforcing deck portions 7, and the adjacent reinforcing deck portions 7 are connected to the cylinder head side. Functions as mouth 8. As a result, the cylinder block S
Is a closed deck type.

5 to 7 show a casting machine for casting the cylinder block S. The casting machine comprises an upper mold 9 which can be raised and lowered, and a lower mold 10 arranged below the upper mold 9. ing.

The upper mold 9 has a mold closing recess 11 opening on the lower surface thereof, and four mandrels 12 projecting downward on the ceiling surface of the recess 11, and each mandrel 12 is fitted into each sleeve 5. .

The lower die 10 includes a fixed block 13 and the fixed block 1
Four movable blocks 15 provided on the upper surface of 3 and having a mold closing convex portion 14 capable of fitting with the mold closing concave portion 11 of the upper mold 9.
₁ to 15 ₄ . They movable block 15 ₁
15 _{4 15} 1 that _opposed, 15 2; ₁₅ 3, 1
5 ₄ is slidably disposed on the fixed block 13 so as to approach and separate from each other.

In the fixed block 13, a concave portion 16 that opens upward, an injection sleeve 17 that communicates with a lower opening of the concave portion 16 with its axis oriented in the vertical direction, two runners 18 that extend from the concave portion 16, and each runner 18 Multiple gates 19 that branch off
And a hot water supply passage 20 opening to the inner peripheral surface of the recess 16. An injection plunger 21 is slidably fitted to the injection sleeve 17, and a closed plunger 23 which is moved forward and backward by a hydraulic cylinder 22 is slidably fitted to the hot water supply passage 20. An upward hot water supply port 24 is provided at an intermediate portion of the hot water supply passage 20, and a hopper 25 is attached to the hot water supply port 24.

Next, the work of casting the cylinder block S by the casting machine will be described.

[Hot water supply process]

As shown in FIG. 6, in the lower mold 10, four sleeves 5 are erected on the fixed block 13, and a sand core 26 for a water jacket is arranged on the outer periphery of each sleeve 5. The injection plunger 21 is in the lowered position,
A mold release agent is applied to the inner peripheral surface of the injection sleeve 17 at the upper part. Further, the closed plunger 23 is in the retracted position and opens the hot water supply port 24.

Movable blocks 15 ₁ and 15 ₂ that face each other; 15 ₃ and 15
₄ are slid on the fixed block 13 in the direction of approaching each other and held in the mold closing position, and a pair of movable blocks 15 ₁ and 15 ₂ facing each other have a core receptacle 27 and a sand core 26 skirting board 28.
To engage and hold the sand core 26 immovably.

As a result, the lower mold 10 is formed with a space Sp that cooperates with the upper mold 9 to define a cylinder block forming cavity.
Each gate 19 communicates with the lower part of the space Sp. The space Sp has an upward opening O that is defined by the upper inner edge of the entire movable block ₁₅ 1-15 _4.

Simultaneously with the lowering of the upper die 9 located at the die open position shown by the chain line in FIG. Supply to the top of the injection sleeve 17. Each mandrel 12 is fitted into each sleeve 5 by the lowering of the upper die 9.

In the injection sleeve 17, a gas is generated by the reaction between the molten metal and the release agent, and steam is generated by heating the inside of the injection sleeve 17. The gases are generated by each runner 18, each gate 19 and It is efficiently discharged from the opening O through the void Sp to the outside.

As shown by the solid line in FIG. 6, immediately before the upper die 9 closes the opening O of the void Sp, the upper die 9 is temporarily stopped, and during that time, the supply of the molten metal to the injection sleeve 17 is completed. Immediately after the completion of the molten metal supply, the opening O of the void Sp is open,
The gas generated in the injection sleeve 17 is efficiently discharged to the outside similarly to the above.

Fitted a recess 11 closed the mold upper mold 9 is again lowered to the mold closing protrusion 14 of the movable blocks 15 ₁ to 15 _4, thereby the upper mold 9 to close the opening O of the cavity Sp Hold in mold closing position.

In this state, the hot water supply passage 20 is connected to the hot water supply port 24 and the hopper 2.
Since it is open to the atmosphere through 5, the gas generated in the injection sleeve is efficiently discharged from the hopper 25 to the outside through the hot water supply passage 20.

By holding the upper mold 9 in the mold closing position, the cylinder block molding cavity C is defined by the upper mold 9 and the lower mold 10 as shown in FIG. That Cavity C
Is the cylinder barrel forming area C ₁ between the core 12 and the sand core 26, the sand core 26 and all the movable blocks 15 ₁ to 15.
₄ upper half between the outer wall portion forming region _{C 2,} as well as made of the crankcase forming region _{C 3} between the total movable block ₁₅ 1-15 ₄ lower half and the fixed block 13.

The hydraulic cylinder 22 is operated to move the closing plunger 23 forward so that the tip end surface of the closing plunger 23 faces the recess 16 to close the hot water supply passage 20.

According to the above method, the mold closing work and the molten metal supply work proceed at the same time, and the mold closing is completed following the completion of the supply of the molten metal to the injection sleeve 17, so that the hot water supply work time is shortened.

[Injection process]

The injection plunger 21 is raised to bring the molten metal into each runner 18,
After being injected into the cavity C through each gate 19, a high pressure is applied to the molten metal in the cavity C by the injection plunger 21, and the molten metal is completely solidified under the high pressure to obtain the cylinder block S. In the meantime, the molten metal is welded to each sleeve 5, and the deformation of each sleeve 5 under high pressure is prevented by each core 12.

After the mold is opened, the sand core 26 is removed from the cylinder block S to obtain the water jacket 6.

As described above, since the gas generated in the injection sleeve 17 is efficiently discharged to the outside, the cylinder block S obtained through the above process does not show any casting defect due to the gas. Further, since the casting work is made more efficient by shortening the hot water supply work time, the productivity of the cylinder block S can be improved.

The present invention is also applicable to casting of castings other than the cylinder block.

C. EFFECTS OF THE INVENTION According to the present invention, the mold closing work and the molten metal supply work are carried out at the same time, and the mold closing is completed following the completion of the supply of the molten metal to the injection sleeve, so that the hot water supply work time is shortened. It is possible to improve the efficiency of casting work and improve the productivity of castings.

In addition, the gas generated in the injection sleeve is efficiently discharged through the opening of the void from the start of the molten metal supply to immediately after its completion, and through the hot water supply passage after the mold is closed. Can be prevented.

[Brief description of drawings]

1 to 4 show a cylinder block, FIG. 1 is a perspective view seen from above, FIG. 2 is a sectional view taken along line II-II of FIG.
3 is a sectional view taken along line III-III in FIG. 2, and FIG. 4 is IV- in FIG.
IV line sectional view, FIG. 5 is a plan view of the lower die of the casting machine, and FIG. 6 is a vertical sectional view of the upper die stop state of the casting machine.
It corresponds to the sectional view taken along the line VI-VI of FIG. 7, and FIG. 7 is a longitudinal sectional view of the mold closed state of the casting machine, corresponding to the sectional view taken along the line VII-VII of FIG. C ... Cavity, O ... Opening, S ... Cylinder block as casting, Sp ... Void, 9 ... Upper mold, 10 ...
… Lower mold, 17 …… Injection sleeve, 20… Hot water supply passage

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Publication No. 52-27106 (JP, B2) Japanese Publication No. 58-54907 (JP, B2) Japanese Publication No. 58-54906 (JP, B2) Actual Publication 57- 3645 (JP, Y2)

Claims (1)

[Claims] 1. A vertically movable upper die (9); a cavity having an upward opening (O) for defining a casting molding cavity (C) in cooperation with the upper die (9). A lower mold (10) having Sp); an injection sleeve provided on the lower mold (10) with its axis oriented in the vertical direction in order to inject the molten metal into the cavity (C) from below the cavity (C). (1
7) and; a hot water supply passage (20) provided in the lower mold (10) for supplying molten metal into the injection sleeve (17);
When hot water is supplied to the injection sleeve (17) of the casting machine equipped with, the upper mold (9) in the mold open position is lowered and the molten metal is supplied to the injection sleeve (17) through the hot water supply passage (20). A first step of supplying; immediately before the upper mold (9) closes the opening (O) of the void (Sp), the upper mold (9) is temporarily stopped and the injection sleeve (17) A second step of completing the supply of the molten metal to the); the opening (O) of the void (Sp) by the upper mold (9) with the hot water supply passage (20) being open to the atmosphere.
The third step of closing the upper mold (9) in the mold closing position; and the fourth step of closing the hot water supply passage (20).
The method for supplying hot water to the injection sleeve of a casting machine is characterized in that