JPH0857623A - Structure for sealing die - Google Patents

Abstract

PURPOSE: To prevent the entrapment of the air and to improve the cast quality by arranging a second sealant continuously making a round around a slide part. CONSTITUTION: A die is formed with a fixed die 1, movable die 2 and slide die 3. These dies 1, 2, 3 are closed to form a cavity 4 for casting. A projecting part 7 in the fixed die 1 and a recessed part 8 in the movable die 2 are formed and a through-hole 9 for inserting the slide part 10 of the slide die 3 is formed in the projecting part 7. A first sealant 5 making a round around the cavity 4 through contacting surface of the projecting and the recessed parts 7, 8 between both dies 1, 2 is arranged. The second sealant 6 continuously making a round around the slide part 10 of a slide core between the slide surface 7a of the projecting part and the slide surface 3a faced to the projecting part of the slide die is arranged. The sealing property is improved by action of the first and the second sealants 5, 6. By this method, the inner part of the die can be made to be high vacuum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die-to-die seal structure of a die including a fixed die, a movable die and a slide die.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
A mold structure including a movable mold 12 and a slide mold 13 is known (for example, Japanese Patent Laid-Open No. 60-92058).
In order to improve the casting quality, it is desired to suppress the entrainment of molten metal in air. For that purpose, it is conceivable to seal the space between the molds with a seal material 15 to reduce the pressure and vacuum of the casting cavity 14 in the mold.

[0003]

However, the following problems occur when the seal structure is applied to the conventional mold structure. As shown in FIG. 2, the sealing material 1 is provided at the portion where the three molds of the fixed mold 11, the movable mold 12, and the slide mold 13 intersect.
5 cannot make one round around the cavity 14, and it is difficult to evacuate the cavity 14. As shown in FIG. 2, even if the ends of the seal material 15 between the fixed die 11 and the movable die 12 are abutted against the seal material 16 around the slide die 13 to form the same point, the slide die 13 Since the moving direction of is a direction in which the end of the seal material 15 between the fixed mold 11 and the movable mold 12 is pushed to escape from the seal material 16, airtightness cannot be secured after the seal material 15 is deformed and escapes. The decompression of the cavity 14 is insufficient. When the sealing material 15 between the fixed die 11 and the movable die 12 is made to go around the cavity 14 once, a part of the sealing material 15 is located on the sliding surface of the slide die 13, and the sealing material 15 is slidable. It will be damaged when sliding 13. It is desirable that the sealing materials 15 and 16 be used by being crimped when the mold is moved back and forth, and not used on the slide surface. An object of the present invention is to provide a mold sealing structure in which a sealing material can continuously make one round around a cavity and which is used at a pressure bonding surface between molds.

[0004]

MEANS FOR SOLVING THE PROBLEMS The mold seal structure of the present invention for achieving the above object is as follows. A seal structure between a mold and a mold, which includes a fixed mold, a movable mold that moves forward and backward to and from the fixed mold, and a slide mold that moves in a direction intersecting the moving direction of the movable mold. That is, a convex portion protruding in the advancing and retracting direction of the movable die is formed on one of the fixed die and the movable die, and a concave portion having a shape having a male and female relationship with the convex portion is formed on the other, and the convex portion is formed on the convex portion. A protrusion that extends in the direction of movement of the slide mold and has a through hole for slidably inserting the slide part of the slide mold, expands outward from the slide part in the slide mold, and is opposed to at least the side surface of the protrusion so as to be movable back and forth. A first seal member is provided between the fixed mold and the movable mold, the first seal member passing through the contact surface between the convex portion and the concave portion and continuously making one round around the cavity, and at least the convex portion. Side surface of the slide type convex section Between the surface, providing the second sealing material one round continuously around the sliding portion of the slide core,
Mold seal structure.

[0005]

In the mold seal structure of the present invention, the convex portion is provided on one of the fixed die and the movable die, and the through hole for slidably inserting the slide die is formed in this convex portion. By passing the contact surface between the convex portion and the concave portion, continuous 1 around the cavity without interfering with the slide mold.
It can be made to circulate, and a complete seal can be provided between the fixed mold and the movable mold. In addition, since the slide type is provided with the convex facing side surface that extends outward from the slide portion and at least faces the side surface of the convex portion so as to be able to move forward and backward, the second sealing material is provided at least on the convex side surface and the sliding type convex facing side surface. When it is provided between the slide mold and the fixed mold, it is possible to make one round around the slide part continuously, and it is possible to completely seal between the slide mold and the fixed mold or the movable mold. Since neither the first seal material nor the second seal material is exposed on the surface on which the slide mold slides and is used by being crimped between the molds, the seal material has high reliability and durability. .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a mold seal structure according to an embodiment of the present invention. The mold includes a fixed mold 1, a movable mold 2 that can move back and forth with respect to the fixed mold 1, and a slide mold 3 that can move in a direction intersecting the moving direction of the movable mold 2. The fixed die 1, the movable die 2 and the slide die 3 form a casting cavity 4 inside the die when the die is closed, and a molten metal (for example, an aluminum alloy molten metal) is poured into the cavity 4 and solidified. By doing so, the product is cast. The product is opened and removed from the mold. Molten metal is cavity 4
When air is entrained in the molten metal and solidified as it is, it forms cavities and causes casting defects, but in order to suppress them, it is desirable to reduce the pressure of the cavity 4 during the pouring to make it vacuum. For that purpose, it is necessary to seal the spaces between the molds so that the cavity 4 can be depressurized. However, it is necessary to use a seal material that is continuous over the entire length in order to bring the seal property close to perfectness, and it is necessary to use the seal material for the pressure bonding surface between the molds and not for the slide surface. is there.

For this reason, a convex portion 7 protruding toward the other is formed on one of the fixed die 1 and the movable die 2, and a concave portion 8 for receiving the convex portion 7 is formed on the other in a shape relationship between the convex portion 7 and the male and female.
Are formed. The illustrated example shows a case where the convex portion 7 is formed on the fixed mold 1. A through hole 9 extending in the moving direction of the slide die 3 is formed in the convex portion 7, and the slide portion 10 of the slide die 3 is slidably inserted into the through hole 9. The outer shape of the convex portion 7 is a trapezoid, and when the movable mold is closed, the facing surfaces 7a and 8a of the convex portion 7 and the concave portion 8 are crimped without sliding.

The slide die 3 extends outward from the slide portion 10 inserted into the through hole 9 of the convex portion 7 and the end of the slide portion 10 on the side far from the cavity 4, and at least the cavity 4 of the convex portion 7. The side surface 7b on the side farther from (the side surface 7b of the convex portion and the side surface of the fixed die in the illustrated example) has a side surface 3a facing the convex portion that is movable back and forth. In the illustrated example, the convex facing side surface 3 a is bent at a right angle from the slide portion 10 and extends outward. When the slide die 3 is slid toward the convex portion 7, the convex-facing side surface 3a is pressed against the convex side surface 7b without sliding.

A first seal material 5 is provided between the fixed die 1 and the movable die 2. The first sealing material 5 makes one continuous turn around the cavity 4, and passes through the facing surfaces 7 a and 8 a where the convex portion 7 and the concave portion 8 are in contact with each other on the way. More specifically, the first sealing material 5 passes around the cavity 4 through the pressure bonding surfaces of the fixed mold 1 and the movable mold 2, and passes through the contact surfaces 7a, 8a of the convex portion 7 and the concave portion on the way. Thus, the cavity 4 is continuously turned around once. All the surfaces through which the first sealing material 5 passes are compression surfaces, not sliding surfaces. Therefore, when the mold is closed, the first seal material 5 is compressed between the fixed mold 1 and the movable mold 2 to completely seal between the fixed mold 1 and the movable mold 2.

A second jeal material 6 is provided between the slide die 3 and the fixed die 1 and the movable die 2. The second sealing material 6 is provided at least between the side surface 7b of the convex portion 7 (the convex side surface 7b and the fixed mold side surface in the illustrated example) and the convex facing side surface 3a of the slide die 3. The second seal member 6 continuously makes one turn around the slide portion 10 of the slide die 3. The surface through which the second sealing material 6 passes is a crimping surface,
Not a sliding surface. Therefore, when the slide die 3 is slid to the mold closing side, the second sealing material 6 is compressed between at least the side surface 7b of the convex portion 7 and the convex portion facing side surface 3a of the slide die 3, and Fixed type 1, movable type 2
Completely seal the space.

Next, the operation will be described. The movable die 2 is closed with the fixed die 1, and the slide die 3 is slid to close the die. At this time, the cavity 4 is completely sealed by the first seal material 5 and the second seal material 6. Next, the cavity 4 is evacuated by depressurizing it with a vacuum pump (not shown). In this state, molten metal is poured into the cavity 4. After the molten metal is solidified, the mold is opened and the product is taken out. This completes one cycle. After that, continuous casting is performed by repeating the above.

In the above, since the first sealing material 5 and the second sealing material 6 are continuous sealing materials and have no cuts or abutting portions, high sealing performance and high vacuum can be obtained. As a result, entrainment of air during pouring is suppressed, and casting quality is improved. Further, since both the first sealing material 5 and the second sealing material 6 are used in such a form that they are compressed between the mold surfaces and are not used for the slide surface, the sealing performance is high and the durability is high without being damaged. . In addition, since the through hole 9 is provided in the convex portion 7 and the slide portion 10 of the slide mold 3 is inserted therein, the above-mentioned first seal material 5 and second seal material 6 are formed.
In addition to enabling a one-round continuous structure, the through hole 9 can also be used as a guide for the slide of the slide mold 3, so that the mold closing motion can be smoothed and the slide positioning can be facilitated.
As described above, by improving the sealing property, it is not necessary to perform double or triple sealing, and the mold using the double or triple sealing structure can be made compact and simple.

[0013]

According to the present invention, the mold is provided with the convex portion and the through hole is provided therein so that the slide portion of the slide mold can be inserted. Therefore, the first seal material and the second seal material are respectively inserted. Since a one-round continuous structure can be adopted and the sealing property is improved, the inside of the mold can be made to have a high vacuum, air can be prevented from being entrained, and the casting quality can be improved. Also,
Both the first sealing material and the second sealing material can be used by compression, and the sealing property and durability are high.

[Brief description of drawings]

FIG. 1 is a perspective view of a mold to which a mold sealing structure according to an embodiment of the present invention is applied.

FIG. 2 is a perspective view of a mold when a seal structure is applied to a conventional mold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed type 2 Movable type 3 Sliding type 3a Convex portion facing side surface 4 Cavity 5 First sealing material 6 Second sealing material 7 Convex portion 7b Convex side surface 8 Recessed portion 9 Through hole 10 Sliding portion

Claims (1)

[Claims] 1. A mold comprising a fixed mold, a movable mold that is moved forward and backward by the fixed mold, and a slide mold that is moved in a direction intersecting the forward and backward movement direction of the movable mold. A seal structure between molds, in which one of the fixed mold and the movable mold is formed with a convex portion projecting in the advancing and retracting direction of the movable mold, and the other is formed with a concave portion having a shape having a male and female relationship with the convex portion. , A through-hole is formed in the convex portion so as to slidably insert the slide portion of the slide die, and the slide die extends outward from the slide portion and can be moved back and forth at least on the side surface of the convex portion. And a first sealing material that makes one round around the cavity through the contact surface between the convex portion and the concave portion between the fixed mold and the movable mold. , At least the side surface of the convex portion and the slide Between the mold protrusion opposite sides of the around the sliding portion of the slide core is continuously provided with a second sealing material 1 lap, mold seal structure, characterized in that.