JP2021016880A - Die casting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die casting apparatus capable of suppressing mixing of a lubricating gas into a cast product. A die casting apparatus 1 according to the present invention includes a sleeve 10 having a molten metal injection port 11 and a molten metal supply port 12, an extrusion member (for example, a plunger tip 14), and an air supply mechanism. The sleeve 10 is arranged between the molten metal injection port 11 and the molten metal supply port 12, and has a lid 13 that can be opened and closed at a predetermined timing. The air supply mechanism is a mechanism in which an air supply port 16 is arranged between the lid 13 and the molten metal supply port 12, and air is supplied from the air supply port 16 to the inside of the sleeve 10 with the lid 13 open. After introducing the molten metal C and the lubricant L from the molten metal injection port 11, the die casting apparatus 1 supplies air from the air supply port 16 to the inside of the sleeve 10 with the lid 13 open, and then closes the lid 13. The molten metal C is supplied to the mold from the molten metal supply port 12 by the extrusion member. [Selection diagram] Fig. 1

Description

The present invention relates to a die casting apparatus.

Patent Document 1 describes a die casting apparatus having a sleeve. The sleeve described in Patent Document 1 is provided on a part of an inner wall surface forming an internal space of a sleeve body having a molten metal injection port into which a molten metal is injected and a molten metal extrusion port that opens at the tip and pushes out the molten metal. A degassing groove leading to the inlet is engraved.

Japanese Unexamined Patent Publication No. 2008-114235

However, in the die casting apparatus described in Patent Document 1, the lubricating gas generated for ensuring lubricity is difficult to be discharged from the molten metal injection port, and may be mixed into the inside of the casting product.

Therefore, an object of the present invention is to provide a die casting apparatus capable of suppressing the mixing of lubricating gas into the inside of a casting product.

The die casting apparatus according to one aspect of the present invention for achieving the above object includes a sleeve having a molten metal injection port and a molten metal supply port, an extrusion member, and an air supply mechanism. The sleeve is arranged between the molten metal injection port and the molten metal supply port, and has a lid that can be opened and closed at a predetermined timing. The air supply mechanism is a mechanism in which an air supply port is arranged between the lid and the molten metal supply port, and air is supplied from the air supply port to the inside of the sleeve with the lid open. In the die casting apparatus, after introducing the molten metal and the lubricant from the molten metal injection port, air is supplied from the air supply port to the inside of the sleeve with the lid open, and the lid is closed before the extrusion. The molten metal is supplied to the mold from the molten metal supply port by the member.

The die casting apparatus according to this aspect includes a sleeve having a lid and a mechanism for supplying air from the opened lid. Therefore, according to the die casting apparatus according to this aspect, the discharge of the lubricating gas generated by the lubricant and the molten metal from the molten metal injection port can be promoted by the supplied air, and the lubricating gas is supplied to the casting product. It is possible to suppress mixing.

According to the present invention, it is possible to provide a die casting apparatus capable of suppressing the mixing of lubricating gas into the inside of a casting product.

It is schematic cross-sectional view which shows the state of the hot water supply process in an example of the die casting casting apparatus which concerns on one Embodiment of this invention. It is a schematic cross-sectional view which shows the state of the vicinity of a lid in the die casting apparatus of FIG. It is schematic cross-sectional view which shows the state at the time of the initial operation of the extrusion process in the die casting casting apparatus of FIG. FIG. 3 is a schematic cross-sectional view showing a state of the die casting apparatus of FIG. 3 as viewed from the IV-IV direction. It is a schematic cross-sectional view which shows the state in the middle of the extrusion process in the die casting casting apparatus of FIG. It is the schematic sectional drawing which shows the state of the hot water supply process in the die casting apparatus which concerns on a comparative example. 6 is a schematic cross-sectional view showing a state at the time of initial operation of an extrusion process in the die casting apparatus of FIG. 6 is a schematic cross-sectional view showing a state during an extrusion process in the die casting apparatus of FIG.

Hereinafter, the die casting apparatus according to the embodiment of the present invention will be described with reference to the drawings. First, an example of the die casting apparatus according to the present embodiment will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view showing an example of a die casting apparatus according to the present embodiment, and is a diagram showing a state of a hot water supply process. In addition, in FIG. 1 and FIGS. 2, 3 and 5 to 8 described later, hatching showing a cross section of the plunger rod and the plunger tip is omitted for convenience.

As illustrated in FIG. 1, the die casting apparatus 1 according to the present embodiment includes a sleeve 10 and an extrusion member for extruding a casting material.

The sleeve 10 can be a tubular member (cylinder member) that serves as an operating path for the extruded member (including a transfer path for the casting material), but the cross-sectional shape thereof does not matter. The sleeve 10 has a molten metal injection port 11 and a molten metal supply port 12.

The molten metal injection port 11 is an opening for injecting a liquid casting material (molten metal) C, and the lubricant L is also introduced from here. The molten metal injection port 11 can also be referred to as a sprue or a molten metal introduction port. The molten metal supply port 12 is an opening for supplying the molten metal C to the mold side by pushing the molten metal C toward the mold (not shown) by the extrusion member, and can also be referred to as a molten metal extrusion port.

Further, the shape of the mold (fixed mold, movable mold, shape of the runner portion) does not matter, that is, the shape of the casting does not matter. The casting referred to here may include a biscuit portion that is finally separated from the casting product. Further, examples of the casting material (that is, the material of the casting) include, but are not limited to, aluminum alloys, zinc alloys, magnesium alloys, copper alloys, lead alloys, tin alloys and the like.

The extruded member will be described below by taking the plunger tip 14 as an example. The plunger tip 14 is provided at the tip of the plunger rod 15 and has an outer shape that matches the inner shape of the sleeve 10. By moving the plunger rod 15 in the left-right direction (forward and reverse directions) in FIG. 1, the plunger tip 14 can be moved in the forward direction and the reverse direction in the sleeve 10. That is, the plunger tip 14 can move forward or backward in the sleeve 10 by the power transmitted via the plunger rod 15.

Further, in the die casting apparatus 1, a fixed mold and a movable mold (not shown) can be arranged as dies on the left side (the molten metal supply port 12 side) of the sleeve 10 in FIG. The fixed mold forms a mold together with the movable mold, and the runner portion is formed by the fixed mold and the movable mold.

Although not shown, the die casting apparatus 1 includes a mechanism for moving the movable mold, a mechanism for moving the plunger rod 15 (forward movement and reverse movement), and a control unit (not shown) for controlling them. be able to. It should be noted that any of these movable mechanisms may be used. The movable mechanism of the plunger rod 15 can be, for example, a movable mechanism by hydraulic control such as a hydraulic cylinder.

The plunger tip 14, the plunger tip 14 and the plunger rod 15 can be referred to as an injection piston, and the sleeve 10 can also be referred to as a plunger sleeve. The injection plunger pump is composed of the sleeve 10, the plunger tip 14, the plunger rod 15, the movable mechanism of the plunger rod 15, and the like.

The sleeve 10 in this embodiment has the following lid 13. Here, the lid 13 is arranged between the molten metal injection port 11 and the molten metal supply port 12, and is a member that can be opened and closed at a predetermined timing. Since the molten metal supply port 12 serves as a supply port for the molten metal C to the mold, it can be said that the lid 13 can be arranged between the molten metal injection port 11 and the mold.

The shape of the lid 13 may be any shape. Further, any opening / closing mechanism for the main body of the sleeve 10 of the lid 13 may be used. The opening / closing mechanism is, for example, a mechanism for opening and closing the lid 13 by rotating the lid 13 around the hinge portion by rotatably joining the lid 13 and the main body side of the sleeve 10 to form a hinge portion. You may. Further, the opening / closing mechanism may be, for example, a shutter-type opening / closing mechanism. Further, the opening / closing control can be performed by the control from the above-mentioned control unit.

The preferable shape of the lid 13 will be described with reference to FIG. FIG. 2 is a schematic cross-sectional view showing a state of the vicinity of the lid 13 in the die casting apparatus 1 of FIG. As shown in FIG. 2, the bottom surface portion of the lid 13 has a step on the outer peripheral side (step of distance D) with respect to the inner wall of the main body of the sleeve 10 so that the plunger tip 14 does not come into contact even if it moves in the direction of the white arrow. It is preferable to add (exemplified in). Here, the bottom surface portion of the lid 13 refers to a portion that forms a part of the inner wall of the sleeve 10 when the lid 13 is closed. As a result, it is possible to prevent the plunger tip 14 from being bitten by the lid 13.

Further, the die casting apparatus 1 according to the present embodiment includes an air supply mechanism. In this air supply mechanism, the air supply mechanism is such that an air supply port 16 such as an air nozzle is arranged between the lid 13 and the molten metal supply port 12, and the air is supplied with the lid 13 open (that is, through the opening 17). It is a mechanism for supplying air from the mouth 16 to the inside of the sleeve 10. The air supply mechanism may be provided as a part of the sleeve 10, but the present invention is not limited to this, and the air supply mechanism may be provided in the die casting apparatus 1.

The casting process in the die casting apparatus 1 as described above will be described with reference to FIGS. 3 to 5. FIG. 3 is a schematic cross-sectional view showing a state at the time of initial operation of the extrusion process in the die casting apparatus 1 of FIG. 1, and FIG. 4 is a schematic cross section showing a state of the die casting apparatus 1 of FIG. 3 as viewed from the IV-IV direction. It is a figure. FIG. 5 is a schematic cross-sectional view showing a state during the extrusion process in the die casting apparatus 1 of FIG.

The die casting apparatus 1 according to the present embodiment introduces the molten metal C and the lubricant L from the molten metal injection port 11 as illustrated in FIG. The lubricant L can be a liquid or a powder. By introducing the molten metal C and the lubricant L, the lubricant L reacts with the molten metal C, and a lubricating gas G for lubricating the sleeve 10 is generated. The molten metal C is introduced after the lubricant L is introduced. As a result, the lubricant L serves as a cushion when the molten metal C is introduced, and damage caused by direct contact of the molten metal C with the inner wall of the sleeve 10 can be mitigated. By adhering the generated lubricating gas G to the inner wall of the sleeve 10, the inner wall of the sleeve 10 can be made lubricated and the plunger tip 14 can be prevented from being bitten.

After the molten metal C and the lubricant L are introduced, the die casting apparatus 1 supplies air from the air supply port 16 to the inside of the sleeve 10 with the lid 13 open as illustrated in FIGS. 3 and 4. The air supply may be started after the lid 13 is opened, but it can also be started before the lid 13 is opened (closed state). In that case, the lid 13 may be opened after the supply is started.

The air can flow along the lid 13 by hitting the lid 13 and introduced into the sleeve 10 through the opening 17, as shown by the flow illustrated by the thick arrow in FIG. 3, whereby the molten metal injection port 11 can be introduced. Lubricating gas G can be discharged from. That is, in the present embodiment, the lubricating gas G can be discharged to the outside of the sleeve 10 by flowing air using the lid 13 and the molten metal injection port 11.

After that, as illustrated in FIG. 5, the die casting apparatus 1 closes the lid 13 and then supplies the molten metal C to the mold from the molten metal supply port 12 by the extrusion member. The method of this supply is not limited, but this supply can be performed by moving the plunger rod 15 together with the plunger tip 14 in the direction of the white arrow in FIG. 5 (that is, moving it forward). At the time of this supply, for example, after the inside of the sleeve 10 on the mold side and the molten metal injection port 11 are blocked by the forward operation of the plunger tip 14, depressurization in the mold is started to suck the molten metal. Can be done.

Here, in order to explain the effect of the present embodiment, the die casting apparatus according to the comparative example will be described with reference to FIGS. 6 to 8. FIG. 6 is a schematic cross-sectional view showing a state of a hot water supply process in the die casting apparatus according to the comparative example. Further, FIG. 7 is a schematic cross-sectional view showing a state at the time of initial operation of the extrusion process in the die casting apparatus of FIG. 6, and FIG. 8 is a schematic cross-sectional view showing a state in the middle of the extrusion process in the die casting apparatus of FIG. is there.

As shown in FIG. 6, the die casting apparatus 100 according to the comparative example includes a sleeve 110, a plunger tip 114, and a plunger rod 115. The sleeve 110 has a molten metal injection port 111 and a molten metal supply port 112, but does not have a lid 13.

In the die casting apparatus 100, after the molten metal C and the lubricant L are introduced from the molten metal injection port 111 as shown in FIG. 6, a part of the lubricating gas G is discharged from the molten metal injection port 111 as shown in FIG. Will be done. However, as shown in FIG. 7, in the die casting apparatus 100, the amount of the lubricating gas G discharged is smaller than that in the case of FIG. 3 in the present embodiment, and a large amount of the lubricating gas G remains inside the sleeve 110. It becomes.

After that, the die casting apparatus 100 supplies the molten metal C to the mold from the molten metal supply port 112 by the plunger tip 114 as illustrated in FIG. This supply can be made by moving the plunger rod 115 together with the plunger tip 114 in the direction of the white arrow in FIG. 8 (that is, moving it forward). At the time of this supply, depressurization (suction of air in the mold) in the mold is started after the inside of the sleeve 110 on the mold side and the molten metal injection port 111 are shut off by the forward operation of the plunger tip 114. By doing so, a part of the molten metal is also pulled.

However, as described above, since the molten metal C is supplied to the mold with a large amount of the lubricating gas G remaining inside the sleeve 110, the lubricating gas G is involved in the casting product (that is, the wax component is involved), and the quality is improved. If it deteriorates and becomes out of specification, disposal loss will occur.

On the other hand, the die casting apparatus 1 according to the present embodiment includes a mechanism for opening the lid 13 arranged on the sleeve 10 and directly supplying air from the opening portion, and the excess lubricating gas is supplied by such air supply. G can be released to the outside of the sleeve 10.

Therefore, according to the die casting apparatus 1, the discharge of the lubricating gas G from the molten metal injection port 11 can be promptly promoted by the supply air, and the lubricating gas G is released on the sleeve 10 when the molten metal C is supplied to the mold. It is possible to suppress the state of remaining inside. That is, according to the die casting apparatus 1, it is possible to suppress the residual of excess lubricating gas G in the sleeve 10 in the state of FIG. 5, and the lubricating gas G is mixed (engaged) in the casting product. Can be suppressed as compared with, for example, a comparative example. Therefore, in the die casting apparatus 1, the quality of the cast product can be improved as compared with, for example, a comparative example, and the occurrence of waste loss can be reduced.

Further, in the present embodiment, the lubricity and the discharge property are controlled by adjusting the air flow rate, the angle when the lid 13 is opened, the air discharge time, and the like to improve the discharge efficiency or the lubricity. You can also do it. Further, in the present embodiment, since the lubricating gas G is discharged to the outside of the sleeve 10, the inside of the sleeve 10 becomes hygienic, the lubricating oil does not drip, and the product quality deteriorates and the quality varies. It can be prevented from occurring. Further, since the die casting apparatus 1 according to the present embodiment is only provided with a mechanism for structurally supplying air and a lid, it is possible to obtain the above-mentioned effects at low cost without requiring a complicated mechanism. it can.

Here, the effect on the technique described in Patent Document 1 in the present embodiment will be supplementarily described. In the technique described in Patent Document 1, since the groove is carved on the wall surface of the sleeve and the size is limited, the lubricating gas is difficult to be discharged from the molten metal injection port and may be mixed into the inside of the casting product. There is. Further, in the technique described in Patent Document 1, when the casting material is inserted into this groove and solidified, the die casting apparatus may be damaged due to interference with the plunger tip when the plunger tip is moved forward or backward. There is sex. Furthermore, if such solidification occurs in part, the volume for storing the lubricating gas may become smaller, making it more difficult for the lubricating gas to be discharged, and the amount of the lubricating gas entrained inside the product increases. There is a possibility that the quality will vary widely. Further, in the technique described in Patent Document 1, when lubricating gas is accumulated in the groove, the lubricant adheres to the upper part of the sleeve as the casting is continued, so that not only the upper part of the sleeve becomes unsanitary but also the upper part thereof becomes unsanitary. If the lubricant drips, it may get mixed into the inside of the next casting product. For this reason as well, the technique described in Patent Document 1 is concerned about product quality deterioration and further quality variation.

In the above, an example of the die casting apparatus according to the present embodiment has been described, but the shape and structure are not limited. For example, the die casting apparatus has been described with an example of using one plunger pump installed sideways, but the number of the die casting apparatus may be a plurality. Further, the die casting apparatus according to the present embodiment is not limited to using a plunger pump, and a piston pump or the like can also be used. In the case of a piston pump, the extrusion member illustrated by the plunger tip 14 corresponds to an injection piston, and the cylinder illustrated by the sleeve 10 corresponds to an injection cylinder.

Although the present embodiment has been described above, the above-described embodiment has the following features.
That is, the die casting apparatus 1 according to the above embodiment includes a sleeve 10 having a molten metal injection port 11 and a molten metal supply port 12, an extrusion member (for example, a plunger tip 14), and an air supply mechanism. The sleeve 10 is arranged between the molten metal injection port 11 and the molten metal supply port 12, and has a lid 13 that can be opened and closed at a predetermined timing. The air supply mechanism is a mechanism in which an air supply port 16 is arranged between the lid 13 and the molten metal supply port 12, and air is supplied from the air supply port 16 to the inside of the sleeve 10 with the lid 13 open. After introducing the molten metal C and the lubricant L from the molten metal injection port 11, the die casting apparatus 1 supplies air from the air supply port 16 to the inside of the sleeve 10 with the lid 13 open, and then closes the lid 13. The molten metal C is supplied to the mold from the molten metal supply port 12 by the extrusion member.

In the above die casting apparatus 1, the sleeve 10 has a lid 13 and has a mechanism for supplying air from the opened lid 13. Therefore, according to the above-mentioned die casting apparatus 1, the discharge of the lubricating gas G generated by the lubricant L and the molten metal C from the molten metal injection port 11 can be promoted by the supplied air, and the cast product has lubricity. It is possible to suppress the mixing of gas G.

1 Die-cast casting equipment 10 Sleeve 11 Molten metal injection port 12 Molten metal supply port 13 Lid 14 Plunger tip 15 Plunger rod 16 Air supply port 17 Opening C Molten metal D Step distance G Lubricating gas L Lubricant

Claims (1)

A sleeve having a molten metal injection port and a molten metal supply port, an extrusion member, and an air supply mechanism are provided.
The sleeve is arranged between the molten metal injection port and the molten metal supply port, and has a lid that can be opened and closed at a predetermined timing.
The air supply mechanism is a mechanism in which an air supply port is arranged between the lid and the molten metal supply port, and air is supplied from the air supply port to the inside of the sleeve with the lid open.
After introducing the molten metal and the lubricant from the molten metal injection port, air is supplied from the air supply port to the inside of the sleeve with the lid open, and after the lid is closed, the molten metal supply port is used by the extrusion member. Supply molten metal to the mold from
Die casting equipment.

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