JP2678545B2 - Casting mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a movable core pin made of a copper alloy and extending into a cavity formed between a fixed mold and a movable mold, and at least one of the fixed mold and the movable mold has the movable core pin. To a casting mold formed with a recess for forming a pad that is adjacent to the above and communicates with the cavity.

[0002]

2. Description of the Related Art As shown in FIG. 7, in a casting die having a movable core pin 04 extending into a cavity 03 defined between a fixed die 01 and a movable die 02, a product to be cast N
Of the fixed mold 01 adjacent to the movable core pin 04 in order to prevent the crack C from being generated in the vicinity of the movable core pin 04.
Is provided with a recessed portion 05 for forming a small portion that communicates with the cavity 03.

[0003]

However, in the copper alloy casting mold, when the molten metal flows from the cavity 03 into the padding forming recess 05, the padding forming recess 0 is formed.
The wall surface of the movable die 02 facing 5 is eroded to form the cavity portion 06.
Is formed. As a result, a protrusion is formed on the product by the molten metal that has flowed into the hollow portion 06, and this protrusion causes troubles such as cracking of the product when the mold is opened or damage to the extrusion pin.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to prevent erosion of a wall surface of a mold facing a recess for forming a flesh formed in a casting mold.

[0005]

To achieve the above object of the Invention The present invention comprises an extending moveable core pins in a cavity formed between the copper alloy of the fixed mold and the movable mold, before <br In a casting mold in which either one of a fixed mold and a movable mold is formed with a recess for forming a pad adjacent to the movable core pin and communicating with the cavity,
From the fixed mold and
The wall surface of the movable type that faces the concave portion for forming the paddle on the other side
There wherein the reinforcing member be prevented from being eroded, were allowed to face the front Symbol paddings forming recesses on the other of said fixed and movable mold Ke set <br/>.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings.

1 to 4 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a casting die, and FIG. 2 is 2-2 of FIG.
3 is an enlarged view of part 3 in FIG. 1, and FIG.
FIG. 4 is a sectional view taken along line 4.

As shown in FIGS. 1 and 2, a casting mold D
Is guided by a fixed mold body 2 having a fixed mold 1 and a pair of left and right guide pins 4, 5 having a movable mold 3, and can be moved toward and away from the fixed mold body 1 by a drive source (not shown). And a movable main body 6. Cavities 7 _L and 7 _R for molding a pair of left and right knuckles N _L and N _R of a vehicle, which is a product, between the molds 1 and 3 in a state where the fixed mold 1 and the movable mold 3 are clamped. , A gate 8 for molding a gate portion G integrally connected to the knuckles N _L and N _R.

A push plate 9 which is arranged on the rear surface of the fixed mold 1 so as to be movable back and forth by a drive source (not shown) slides on three guide holes 10, 10 and 11 formed in the fixed mold body 2 and the fixed mold 1. Two product extruding pins 12, 12 that freely penetrate and one gate extruding pin 13 are housed, and the product extruding pin 12,
The tip of 12 faces the cavities 7 _L and 7 _R, and the tip of the push pin 13 for the gate portion faces the gate 8.

On the other hand, the push plate 14 provided on the back surface of the movable die 3 so as to be movable back and forth by a drive source (not shown) is provided with three guide holes 15, 15; 16 formed in the movable die body 6 and the movable die 3. Two product extruding pins 17, 17 that slidably penetrate and one gate extruding pin 18 are housed, and the tips of the product extruding pins 17, 17 are on the product extruding pins 12, 12. The cavities 7 _L and 7 _R face each other, and the tip of the gate portion push-out pin 18 faces the gate 8 so as to face the gate portion push-out pin 13.

As is apparent from FIG. 1, the knuckle N _L ,
In order to form the first through hole H ₁ at the same time when N _R is molded, the movable core pin 19 that penetrates the movable mold 3 and can extend into each of the cavities 7 _L and 7 _R is provided. That is, the movable core pin support member 22 is fixed to the output rod 21 of the cylinder 20 provided on the upper surface of the movable die 3, and the movable core pin 19 is attached to the tip thereof. Movable core pin support member 22
Is slidably guided by a guide member 24 fixed to the movable die 3 with a bolt 23, and a guide rod 25 integrally provided with the movable core pin support member 22 slides on guide members 26, 26 provided on the cylinder 20. You will be guided freely.

In addition, when the knuckles N _L and N _R are formed, the second
The fixed mold 1 and the movable mold 3 are formed to simultaneously form the through holes H _2.
, A pair of fixed core pins 27, 28 extending into the cavities 7 _L , 7 _R are provided, respectively.

As shown in FIGS. 3 and 4, in the vicinity of the upper ends of the cavities 7 _L and 7 _R , that is, in the vicinity of the movable core pin 19, a portion 1 of the fixed mold 1 is cut away to form a padding forming recess 1. ₁
Is formed. The concave portion 1 ₁ for forming the paddle is the movable core pin 19
Is formed so as to surround the outer periphery of the movable mold 3 with a central angle of 180 °, and the upper surface thereof is defined by an iron reinforcing member 29 embedded in the movable mold 3. The reinforcing member 29 is embedded in the movable mold 3 so as to surround the outer periphery of the guide member 24 with a center angle of 180 °, and the padding forming recess 1 ₁
Exposed surface side of which it is formed in size to cover the complete該駄meat forming recess 1 _1.

Next, the operation of the embodiment of the present invention having the above construction will be described.

When the fixed die 1 and the movable die 3 are clamped,
The cylinder 20 is extended to drive the movable core pin 19 to each key.
Avity 7_L, 7_RPour the molten iron into it while projecting it inside.
When put in, the molten metal is formed between the molds 1 and 3.
Through the cavity 8 to the cavity 7_L, 7_RFlow into. Molten metal
When cooled and solidified, the cylinder 20 is contracted and driven to move the movable core piston.
And push out the push plate 14 on the movable mold 3 side.
Allow the product extrusion pins 17 and 17 and the gate extrusion pin
Knuckle N at 18_L, N_RAnd the gate part G is fixed type 1
The movable mold 3 is retracted while being pressed against. Then fixed type
The push plate 9 on the first side is moved forward to push out the product extruding pins 12, 12 and
Knuckle N with push pin 13 for gate and gate _L, N_RAnd
After pushing out the base portion G from the fixed mold 1, a robot (not shown)
Knuckle N by To_L, N_RAnd the casting of the gate part G
Remove from mold D. Thereby, the movable core pin 19
Formed through hole H₁And fixed core pins 27, 28
Second through hole H formed by_TwoWith and
Knuckle N with integrated gate G_L, N_RIs molded
It is.

Thus, in FIG. 3, each cavity 7 _L ,
Some of the molten metal flowing into 7 _R also flows into the paddings forming recess 1 _1, the knuckle N _L, the end two paddings portion N ₁ of N _R formed integrally, thereby knuckle N _L, N _The crack C (see FIG. 7) is prevented from occurring in the _R body. And
When the molten metal in the paddings forming recess 1 ₁ flows, spoiled since the reinforcing member 29 to the movable mold 3 facing the meat forming recess 1 ₁ is embedded, the cavity 06 is movable mold 3 is corroded (Figure 7) is prevented from occurring. As a result, the fixed mold 1 and the movable mold 3 are smoothly opened, and problems such as product cracking are prevented.

5 and 6 show a second embodiment of the present invention. The reinforcing members 29, 29 of this embodiment are larger than those of the first embodiment and reach the upper surface of the movable die 3. It is fixed to the movable die 3 by two bolts 30, 30. Thus, according to the second embodiment as well, it is possible to obtain the same effects as those of the first embodiment.

Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various design changes can be made.

For example, in the embodiment, the padding forming recess ₁₁ is formed on the fixed mold 1 side, but it may be formed on the movable mold 3 side. In this case, the reinforcing member 29 is the fixed mold 1.
Will be provided on the side. Further, the present invention is a knuckle N
It can be applied to casting of any product other than _L and N _R.

[0020]

As described above, according to the present invention, the copper alloy
Made in fixed and either the movable mold to form adjacent to the paddings forming recesses in the movable core pin, its other one,
Since a reinforcement member for preventing wall erosion that faces the recess for forming the flesh is provided, it is possible to reliably avoid the inconvenience of eroding the wall surface of the copper alloy mold facing the recess for forming the slab when the molten metal flows in. Can occur and troubles caused by the erosion will occur
To be prevented .

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a casting die.

FIG. 2 is a view taken along the line 2-2 of FIG.

FIG. 3 is an enlarged view of a part of FIG. 1;

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a diagram corresponding to FIG. 3 according to a second embodiment of the present invention.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

FIG. 7 is a partial sectional view of a conventional casting die.

[Explanation of symbols]

1 Fixed type 1 ₁ Recessed portion forming recess 3 Movable type 7 _L cavity 7 _R cavity 19 Movable core pin 29 Reinforcement member

Claims (1)

(57) [Claims] [Claim 1] with the copper alloy of the fixed mold (1) and movable mold (3) cavity formed between (7 _L, 7 _R) extendible movable core pin in (19), before Symbol fixed type (1) and movable mold (3) to either of said adjacent to the movable core pin (19) cavity (7 _L, 7 _R)
In a casting mold formed with a recess (1 ₁ ) for forming a flesh which communicates with a molten metal , the molten metal is formed from the cavity (7 _L , 7 _R ) to form the flesh.
When it flows into the recess (1 ₁ ) for use with the fixed mold (1)
One of the dynamic type (3) and the other _one of
Reinforcement member (2) that prevents the opposing wall surfaces from being eroded.
9), said fixed mold (1) and the other one on to face the front Symbol paddings forming recess (1 _1), characterized in that provided in the casting mold of the movable mold (3).