JPH09225615A - Casting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration of quality of a cast product caused by lubricator stayed into a gap between the end surface of a plunger sleeve and the end surface of a die sleeve. SOLUTION: In a casting device facing the die sleeve 50 to the plunger sleeve 34 supported with a sleeve holder 36 in the axial direction, elastic members 62 energizing the plunger sleeve 34 toward the die sleeve 50 are arranged between the sleeve holder 36 and the plunger sleeve 34. The end surface 35a of the plunger sleeve 34 and the end surface 52a of the die sleeve 50 are tightly adhered with the energizing force of the elastic members 62, and it can be prevented to accumulate the lubricator into the gap between the end surface 35a and the end surface 52a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting apparatus in which molten metal is pushed into a mold by a plunger, and more particularly to a casting apparatus for preventing quality deterioration of a cast product due to a lubricant that lubricates the plunger.

[0002]

2. Description of the Related Art FIG. 6 shows an example of a conventional casting apparatus using a high pressure casting method. The casting apparatus includes a casting machine body 2 and a mold 4, and the mold 4 is removable from the casting machine body 2. The mold 4 is replaced according to the type of cast product. On the casting machine body 2 side, a plunger 6 that can move forward and backward with respect to the mold 4 is provided. Plunger 6
It is slidably fitted in the plunger sleeve 8.
The flange portion of the plunger sleeve 8 is held by the sleeve holder 10. A die sleeve 12 is provided on the mold 4 side, and the die sleeve 12 is arranged so as to face the plunger sleeve 8 in the axial direction.

In the above casting apparatus, the molten metal 20 is supplied into the plunger sleeve 8 from a nozzle (not shown), and the molten metal 20 in the plunger sleeve 8 is injected into the plunger 6.
It is pushed into the mold 4 by. A plunger sleeve 8 and a die sleeve 1 are provided on the outer peripheral surface side of the plunger 6.
To prevent galling with 2, the lubricant is supplied for each shot (pouring).

[0004]

However, the above casting apparatus has the following problems. The plunger sleeve 8 and the die sleeve 12 are arranged in a state where the end faces 8a and 12a face each other, but if a gap S exists between the end faces 8a and 12a, the lubricating oil collects in the gap S. Molten metal 20
When the molten metal 20 and the lubricant in the gap S come into contact with each other at the time of pushing, the lubricant becomes a gas, and the bubbles are mixed in the cast product, which deteriorates the quality of the cast product. When the mold 4 is attached to the casting machine main body 2 side, a spacer (not shown) is inserted in the spacer adjusting portion 14 between the sleeve holder 10 and the plunger sleeve 8 to form a gap S considering the thermal expansion of the die sleeve 12. Although adjustment is performed, if the spacer is inserted too much, the sleeve holder 10 is deformed by the mold clamping force when the mold 4 is fixed to the casting machine body 2. Since the sleeve holder 10 cannot be easily replaced due to the structural relationship of the casting machine body 2, once the sleeve holder 10 is deformed, it becomes difficult to adjust the gap S by the spacer, and the sleeve holder 10 is used in a deformed state. If it continues, the amount of deformation will become larger and adjustment will be impossible.

An object of the present invention is to provide a casting apparatus capable of preventing the quality of a cast product from deteriorating due to the lubricating oil accumulated in the gap between the end surface of the plunger sleeve and the end surface of the die sleeve. .

[0006]

A casting apparatus according to the present invention that achieves the above object is as follows. (1) In a casting device in which a die sleeve and a plunger sleeve supported by a sleeve holder are axially opposed to each other, an elastic member is provided between the sleeve holder and the plunger sleeve. . (2) In a casting device in which a die sleeve and a plunger sleeve supported by a sleeve holder are axially opposed to each other, an end surface of the plunger sleeve opposed to the die sleeve is located radially outward from an inner peripheral surface of the sleeve. A casting apparatus having a relief groove extending radially outward from a position separated by a fixed amount.

In the casting apparatus of the above (1), since the plunger sleeve is biased toward the die sleeve by the elastic member, the end surface of the plunger sleeve and the end surface of the die sleeve can be brought into close contact with each other. Therefore, the lubricating oil is not accumulated between the end surface of the plunger sleeve and the end surface of the die sleeve, and the generation of gas due to the contact between the molten metal and the lubricant is prevented. Further, the die sleeve thermally expands toward the plunger sleeve due to the contact with the molten metal, but the expansion amount can be absorbed by the elastic deformation of the elastic member. Will also be possible.

In the casting apparatus of the above (2), the lubricating oil is collected in the gap between the end surface of the plunger sleeve and the end surface of the die sleeve, but the end surface of the plunger sleeve facing the die sleeve has a radial direction. Since the escape groove extending outward is provided, the lubricating oil accumulated in the gap can be discharged to the outside through the escape groove.

[0009]

1 and 2 show a first embodiment of the present invention.
FIG. 3 and FIG. 4 show a second embodiment of the present invention, and FIG. 5 shows a third embodiment of the present invention. Structural parts common to all the embodiments are given the same reference numerals in all the embodiments. First, a structure common to all embodiments will be described with reference to, for example, FIGS.

As shown in FIGS. 1 and 2, a casting device 25
Is composed of a casting machine body 30 and a mold 40.
The casting machine body 30 pushes the molten metal 20 into the mold 40. A mold 40 is detachably fixed to the casting machine body 30. The casting machine body 30 has a plunger 32 that can move forward and backward with respect to the mold 40. Plunger 3
2 is slidably fitted in the plunger sleeve 34. A flange portion 34a that bulges outward in the radial direction is formed on the upper portion of the plunger sleeve 34. The cylinder sleeve outer peripheral surface 34c of the plunger sleeve 34 is held by a sleeve holder 36 so as to be movable in the axial direction. The molten metal 20 from the nozzle 38 is supplied into the plunger sleeve 34 via the mouthpiece 37.

The mold 40 has an upper main mold 41, an intermediate mold 42, and a lower mold plate 43. Upper main mold 41 and intermediate mold 4
An upper mold 44, a horizontal mold 45, and a lower mold 46 are arranged between the two. The lower mold plate 43 is attached to the lower surface of the intermediate mold 42. The mold 40 includes an upper mold 44 and a horizontal mold 45.
The lower mold 46 and the lower mold 46 form a cavity 47. The mold 40 is provided with a die sleeve 50 that supplies the molten metal 20 to the cavity 47. Die sleeve 5
The lower end portion 51 of 0 is formed in a flange shape that bulges outward in the radial direction. The die sleeve 50 is held by the intermediate die 42 and the lower plate 43. The upper end of the plunger sleeve 34 and the lower end of the die sleeve 50 are
It is aligned. At the upper end portion of the plunger sleeve 34, a convex portion 35 protruding upward from the flange portion 34a is formed.
Are formed. A lower end portion 51 of the die sleeve 50 is formed with a concave portion 52 that can be fitted into the convex portion 35.
A step portion 36a is formed at a position facing the flange portion 34a of the sleeve holder 36.

Next, the structure peculiar to each embodiment of the present invention will be described. In the first embodiment of the present invention, as shown in FIGS. 1 and 2, the flange portion 34 of the plunger sleeve 34 is
On the lower surface side of "a", holding holes 6 are provided at a predetermined interval in the circumferential direction.
0 is formed. Ceiling surface of holding hole 60 and step 36
An elastic member 62 for urging the plunger sleeve 34 toward the die sleeve 50 is provided between the elastic member 62 and a.
The elastic member 62 is composed of, for example, a spring, but is not limited to this as long as it has a function of urging the plunger sleeve 34 toward the die sleeve 50. The spring may be a leaf spring, a disc spring, etc. other than the compression coil spring shown in FIG. Elastic member 6
2, one side of the outer peripheral portion is held by the inner peripheral surface of the holding hole 60. The elastic member 62 includes the plunger sleeve 34.
The end surface 35a of the convex portion is pressed against the end surface 52a of the concave portion 52 of the die sleeve 50 to bring the end surface 35a and the end surface 52b into close contact with each other.

In the second embodiment of the present invention, FIGS.
As shown in FIG. 5, a plurality of escape grooves 70 are formed at predetermined intervals in the circumferential direction on the upper end surface side of the plunger sleeve 34 facing the lower end of the die sleeve 50.
The escape groove 70 extends radially outward from the end surface 35a of the convex portion 35 toward the end surface 34b of the flange portion 34a. The escape groove 70 extends from the sleeve inner peripheral surface 34d to the outer peripheral surface of the flange portion 34a starting from a position separated by a predetermined amount in the radial outward direction. Inner peripheral surface of sleeve 34
The distance L between d and the starting point 70a of the escape groove 70 is set to, for example, 5 mm or more. The escape groove 70 has a starting point 7
The 0a side is down, and the terminal end 70b side extends horizontally. The end 70b of the escape groove 70 is formed by the lower mold plate 4
3 and the sleeve holder 36 are opened in a gap 48.

In the third embodiment of the present invention, as shown in FIG. 5, both the elastic member 62 shown in the first embodiment and the relief groove 70 shown in the second embodiment are provided. The structures and functions of the elastic member 62 and the escape groove 70 in this embodiment are as follows.
Since it is the same as the first and second embodiments, the same parts are designated by the same reference numerals as those in the first and second embodiments, and the description thereof is omitted.

Next, the operation of each of the above embodiments will be described. In the first embodiment, the casting mold 40 is used as the casting machine body 3
When it is attached to the position 0, the end of the plunger sleeve 34 and the end of the die sleeve 50 are aligned so as to face each other. In this state, since the convex portion 35 is fitted in the concave portion 52, the plunger sleeve 34 and the die sleeve 50 are centered. When the mold 40 is set at a predetermined position on the casting machine body 30, the casting mold 40 is clamped on the casting machine body 30. When the mold clamping of the mold 40 is completed,
The elastic member 62 elastically deforms in the compression direction. Therefore, the end surface 35a of the plunger sleeve 34 is pressed against the end surface 52a on the die sleeve 50 side by the elastic member 62,
The end face 35a and the end face 52a can be brought into close contact with each other.

During casting, the molten metal 20 is supplied from the nozzle 38 into the plunger sleeve 34 via the mouthpiece 37, and the molten metal 20 in the plunger sleeve 34 is pushed toward the cavity 47 by the plunger 32. When the molten metal 20 is pushed in by the plunger 32, lubricating oil (not shown) is supplied to the outer peripheral surface side of the plunger 32 in order to maintain good slidability with the plunger sleeve 34 and the die sleeve 50. Here, since the end surface 35a of the plunger sleeve 34 and the end surface 52a of the die sleeve 50 are in close contact with each other by the urging force of the elastic member 62, the lubricating oil will not collect between the end surface 35a and the end surface 52a. Therefore, the generation of gas due to the contact between the lubricating oil and the molten metal 20 is prevented, the gas does not form bubbles and is not mixed in the molten metal 20, and it is possible to prevent the quality deterioration of the cast product.

Further, the die sleeve 50 is thermally expanded by contact with the molten metal 20 and extends toward the plunger sleeve 34 side. However, since the plunger sleeve 34 is elastically supported by the elastic member 62, the thermal expansion of the die sleeve 50 is performed. The elastic deformation of the spring 62 can absorb the elongation due to Therefore, the end surface 35a and the end surface 52a
It is possible to prevent the sleeve holder 36 from being deformed due to thermal deformation of the die sleeve 50 while maintaining a close contact with the sleeve holder 36.

In the second embodiment, the casting machine body 3 of the casting mold 40 is used.
When the mold is clamped to 0, the flange portion 34a of the plunger sleeve 34 and the step portion 36a of the sleeve holder 36 are
A spacer (not shown) is inserted between the end surface 35a of the plunger sleeve 34 and the end surface 52a of the die sleeve 50, and the gap S is adjusted to a value in consideration of the thermal expansion of the die sleeve 50. . At the time of casting by pushing the molten metal 20 supplied into the plunger sleeve 34, the lubricating oil supplied to the outer peripheral surface side of the plunger 32 has an end surface 35a.
Although it collects in the gap S between the end face 52a and the end surface 52a, the lubricating oil that collects in the gap S is discharged to the outside through the escape groove 70, so that the generation of gas due to the contact between the molten metal 20 and the lubricating oil is suppressed. Is possible. Therefore, it is possible to prevent the gas from forming bubbles and being mixed in the molten metal 20, and it is possible to prevent deterioration of the quality of the cast product. Further, since the starting point 70a of the escape groove 70 is set at a position radially outward from the sleeve inner peripheral surface 34d by a predetermined amount, the molten metal 20 is prevented from flowing into the escape groove 70.

In the third embodiment, the spring 62 has the same effects as those of the first embodiment, and the following effects are obtained. When the mold 40 is clamped to the casting machine main body 30 side, the end surface 35a of the plunger sleeve 34 and the end surface 52a of the die sleeve 50 come into close contact with each other.
When the lubricating oil is attached to 52a, the attached lubricating oil is pushed out from between the end surfaces 35a and 52a. In this case, most of the lubricating oil that is pushed out is discharged to the outside through the escape groove 70, so that the lubricating oil hardly flows into the plunger sleeve 34, and the gas generated by the contact between the molten metal 20 and the lubricating oil is reduced. Occurrence is suppressed.

[0020]

According to the casting apparatus of claim 1, since the elastic member is provided between the sleeve holder supporting the plunger sleeve and the plunger sleeve, the end surface of the plunger sleeve and the end surface of the die sleeve are brought into close contact with each other. It is possible to prevent the lubricant from accumulating between the both end faces. Therefore, it is possible to prevent the generation of gas due to the contact between the molten metal and the lubricant, and it is possible to prevent the quality of the cast product from deteriorating. Further, the amount of thermal expansion of the die sleeve toward the plunger sleeve can be absorbed by the elastic deformation of the elastic member, so that the sleeve holder can be prevented from being deformed due to the thermal expansion of the die sleeve. According to the casting apparatus of claim 2, a relief groove extending outward in the radial direction is provided on an end surface of the plunger sleeve that faces the die sleeve, the starting point being a position separated by a predetermined amount outward in the radial direction from the inner peripheral surface of the sleeve. Therefore, the lubricating oil accumulated in the gap between the end surface of the plunger sleeve and the end surface of the die sleeve can be discharged to the outside through the escape groove. Therefore, generation of gas due to contact between the lubricating oil and the molten metal is suppressed, and deterioration of the quality of the cast product can be prevented.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of essential parts of a casting apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of the casting apparatus of FIG.

FIG. 3 is an enlarged cross-sectional view of a main part of a casting apparatus according to a second embodiment of the present invention.

FIG. 4 is a partially enlarged perspective view of the plunger sleeve in FIG.

FIG. 5 is an enlarged sectional view of an essential part of a casting apparatus according to a third embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a main part of a conventional casting apparatus.

[Explanation of symbols]

 30 Casting Machine Main Body 32 Plunger 34 Plunger Sleeve 35a End Face 36 Sleeve Holder 40 Mold 50 Die Sleeve 52a End Face 62 Elastic Member 70 Relief Groove

Front page continuation (72) Inventor Yuichi Suzuki, 5-4 Yonbancho, Chiyoda-ku, Tokyo, inside Topy Industries Ltd. (72) Inventor, Yushi Iwakura 5-9, Yonbancho, Chiyoda-ku, Tokyo Inside Topy Industries, Ltd. (72) Inventor Hisao Fukuda 9 Topy Kogyo Co., Ltd. 5-4 Yonbancho, Chiyoda-ku, Tokyo

Claims (2)

[Claims] 1. A casting apparatus in which a die sleeve and a plunger sleeve supported by a sleeve holder are axially opposed to each other, and an elastic member is provided between the sleeve holder and the plunger sleeve. Casting equipment. 2. A casting device in which a die sleeve and a plunger sleeve supported by a sleeve holder are axially opposed to each other, wherein an end surface of the plunger sleeve facing the die sleeve is radially outward from an inner peripheral surface of the sleeve. The casting apparatus is provided with a relief groove extending outward in the radial direction from a position separated by a predetermined amount as a starting point.