JP3352844B2 - Vertical die casting machine and casting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical die casting machine for injecting molten metal into a mold cavity from directly below and a casting method.

[0002]

2. Description of the Related Art Conventionally, for example, when casting aluminum wheels for automobiles by a squeeze die casting method,
As described in Japanese Patent Publication No. 3-4297, a fixed die as a lower die is cast using a device which is set on a fixed platen whose upper surface is entirely flush. However, generally, due to the structure of the aluminum wheel, the gate diameter must be smaller than the casting sleeve diameter. In addition, in casting, it is often better to make the gate diameter smaller than the casting sleeve diameter in order to prevent the layer solidified on the inner surface of the casting sleeve from flowing into the gate.

In this case, since the riser portion (also called a biscuit) of the pouring port cannot be projected upward after casting, a center pin having a diameter slightly smaller than the gate diameter is projected from the upper side into the gate. It was also considered to cut out the feeder part and take it out. In addition, it is necessary to spray the release agent on the riser part of the lower mold from the lower part of the gate, and to reduce the oxide and solidified layer of the molten metal generated in the casting sleeve to reduce the defective rate. It has been found empirically that the use of wire mesh is effective.

For this reason, in such a vertical die casting machine, (1) a gate spray device for spraying a gate from below, (2) a wire mesh mounting device, and more preferably (3) a dropping chute of a cut biscuit. , Must be mounted under the lower mold, but conventionally, the lower mold was moved to a position different from the injection position.

[0005]

That is, in the prior art, the lower die was placed on another table on the upper surface of the fixed plate and moved to perform the above-mentioned work, so that the moving time was reduced. However, the cycle time becomes longer, the space of the device is required more, and the cost is higher.

In order to shorten the cycle time of the machine, to reduce the space of the apparatus and to reduce the cost, a gate spray apparatus for spraying a gate from below without mounting a lower mold on a fixed plate and moving it. , (2) It is necessary to be able to attach the wire mesh mounting device to the lower part of the lower mold.
A cut chute for discharging the biscuit may be provided below the lower mold as needed.

[0007]

In order to solve these problems, the present inventor improved the shape of a fixed platen on which a fixed die as a lower die is mounted. In the present invention, a casting sleeve is removably provided from below in a fixed mold attached to a fixed platen, and a casting sleeve in which an injection plunger is slidably inserted therein is disposed laterally below the fixed mold. In a vertically movable die-casting machine, a notch hole vertically penetrating the fixing plate is provided from the center of the fixing plate to both side ends, and the upper surface of the connecting portion, which is the side end, is cut out by the notch. Lowering than the fixed mold mounting surfaces provided on both sides of the hole in the direction perpendicular to the side end, the casting sleeve can be supplied with hot water inside the center and one of the side ends in the notch hole. And a gate spraying device or a wire mesh mounting device is provided so as to be laterally movable between the central portion and the inside of the other of the side ends.

In the above-mentioned apparatus, an injection device having a casting sleeve mounted on an upper portion is provided so as to be tiltable about a lower end side as a center of rotation. A chute for discharging biscuits was attached.

[0009]

When the casting sleeve is moved to a position on the inside of one of the side ends where hot water can be supplied while the fixed mold is still mounted on the fixed platen, the gate spray device or the wire mesh mounting device is moved to the center. The gate is sprayed from below to the fixed mold to install the gate spray or wire mesh, and then the gate spray device or the wire mesh mounting device is moved to the inside of the other of the side ends. The sleeve is moved to the center and docked to the lower part of the fixed mold to perform a casting operation.

[0010] An injection device having a casting sleeve mounted on the upper portion is provided so as to be tiltable about the lower end side as a center of rotation, and a chute for discharging a biscuit after casting is provided on a side surface opposite to the tilting direction of the injection device. Using a vertical die-casting machine equipped with a fin, the casting sleeve is moved to a position where hot water can be supplied inside one of the side ends, and the gate spray device or wire mesh mounting device is moved to the center. Then, before the gate spray or the wire mesh is attached to the fixed mold from below, the biscuit at the lower part of the fixed mold may be pushed down and slid on the chute to take out.

[0011]

Next, the present invention will be described with reference to an embodiment shown in FIGS. FIG. 1 shows one embodiment of a vertical clamping vertical casting type die casting machine, wherein 1 is a horizontal fixed plate, 2 is a fixed die which is also a lower die mounted on the upper surface of the fixed plate 1, and 3 is a fixed die. A movable platen that moves up and down, 4 is a movable mold that is also an upper mold attached to the lower surface of the movable platen 3 via a backup plate 4a, 5 is a cylinder platen, 6 is a cylinder for moving the movable platen 3 up and down, 7 Is a column, 7a is a column nut, and 8 is a cavity formed between the fixed mold 2 and the movable mold 4.

Reference numeral 9 denotes a casting sleeve, which is provided at the lower center of the fixed mold 2 and which is detachably provided from below, for inserting a molten metal 10;
1 is a plunger tip slidably provided in the casting sleeve 9 up and down, 12 is a plunger, 13 is an injection cylinder,
A frame 14 is provided above the injection cylinder 13 so as to be vertically movable by the operation of the cylinder 15.
A casting sleeve 9 is attached to the upper end of 4.

The lower end of the injection cylinder 13 is mounted on a fixed frame 16 via a horizontal shaft 17 and includes a casting sleeve 9, a plunger tip 11, a plunger 12, an injection cylinder 13, a frame 14, a cylinder 15, and the like. The injection device 18 is provided so as to be swingable about the horizontal shaft 17. The fixed frame 16 is fixed to the lower surface of the fixed platen 1 by several rods 19. Injection device 18
The cylinder for oscillating is, for example,
As shown in Japanese Patent Publication No. 21414 and Japanese Patent Publication No. 58-29182, they are publicly known and are not shown.

The fixed platen 1 on which the fixed mold 2 is mounted has, for example, a structure as shown in FIGS. As shown in FIGS. 2 to 4, a substantially rectangular cutout hole 20 vertically penetrating the fixed plate 1 is provided in the fixed plate 1 having a substantially rectangular planar outer shape. To the side end portions 1b on both sides in the longitudinal direction, and the upper surface 1c of the connecting portion, which is the side end portion 1b, is provided on both sides in a direction perpendicular to the side end portion 1b side of the notch hole 20 in each rectangular shape. It was lower by H than the fixed mold mounting surface 1d. The length of the fixed mold mounting surface 1d in the side end portion 1b side was shorter than the length of the cutout hole 20 in the longitudinal direction. The fixing plate 1 having such a structure is formed by the notch hole 20.
This is to make it easier to supply hot water to the casting sleeve 9 and to attach a gate spray or a wire net, which will be described later, by making good use of. In this case, the H does not necessarily have to be the same on the left and right, and may have a dimension sufficient for each operation to be sufficiently performed.

FIG. 5 shows the structure of the mold part in detail. A casting sleeve 9 having a plunger tip 11 and an upper portion of the plunger 12 therein is provided at the lower end of the fixed mold 2 so as to be detachable from below.
The gate 21 is provided between the two. The diameter of the gate 21 is smaller than the inner diameter of the casting sleeve 9. Generally, an oxide film is generated on the surface of the molten metal 10 in the casting sleeve 9, and the portion along the side wall of the casting sleeve 9 is cooled quickly, so that the chill layer 22 is generated by solidification. . If both of them are mixed into the cavity 8 as a large lump, that part becomes a defect, resulting in poor casting.

In order to prevent this defect, the diameter of the gate 21 is made smaller than the inner diameter of the casting sleeve 9 and most of the chill layer and the oxide film are collected on the gate entrance end face 23 of the fixed mold 2 and the inside of the gate 21 and Do not mix into the cavity 8. Further, by installing a wire net 24 in the gate 21, a large lump of chill layer and oxide film are prevented, and a small chill layer and oxide film are re-dissolved and diffused to obtain a high quality cast product.

Reference numeral 25 denotes a center pin, which is also called an "acurad pin". Reference numeral 26 in FIG. 1 denotes a cylinder, and the center pin 25 is, for example, as shown in Japanese Patent Publication No. 3-4297. In order to separate the portion or the biscuit portion from the product, it is slightly smaller than the inner diameter of the gate 21.

In the notch hole 20 of the fixed platen 1, the casting sleeve 9 is provided so as to be movable laterally between the central portion 1a and one of the side ends 1b where hot water can be supplied. The gate spray device 27 and the wire mesh mounting device 28 are provided so as to be movable in the lateral direction between the central portion 1a and the other inside of the side end portion 1b. Reference numerals 27a and 28b denote laterally movable arms having a gate spray device 27 and a wire mesh mounting device 28 attached to their distal ends, respectively.

FIG. 2 shows a position at which hot water can be supplied to the casting sleeve 9, M a standby position for retracting the gate spray device 27, and N a standby position for retracting the wire netting device 28. FIG.
The middle and arrow indicate the gate spray device 27 and the wire mesh mounting device 28.
Indicates the direction of movement of.

As shown in FIG. 1, a chute 29 is attached to the side of the injection device opposite to the direction in which the injection device is tilted, so that the biscuit 33 after casting can be discharged outside when dropped. The chute 29 is inclined, and the biscuit 33 dropped from the lower part of the fixed mold falls on the chute 29 and slides down in a state where the injection device is tilted. Numeral 30 denotes a thin guard plate attached to the upper part of the chute 29 so as to prevent the spray liquid, aluminum pieces and the like from dropping onto the injection device 18 and hitting the main body of the injection device 18.

Next, the operation of this embodiment will be described. First, as shown in FIG. 6, after the injection device 18 is tilted and the mold is opened, the product 31 obtained by casting in the previous cycle is taken out and attached to the tip of the arm 27a which can move in the lateral direction. The gate spray device 27 is moved to the center 1a, and the gate 21 is sprayed with a release agent from below. At this time, since the chute 29 and the guard plate 30 are located below, the main body of the injection device 18 is less likely to be stained by the release agent.

When the release spraying is completed, the gate spray device 27 is retracted to the position M, and as shown in FIG. 7, the wire mesh mounting device 28 is alternately moved to the central portion 1a by the action of the arm 28a, and the gate 21 is moved. The wire net 24 is attached to the. FIG. 5 shows the mounting state of the wire netting 24.
When the wire netting 24 is completed, the wire netting device 28 is retracted to the N position. Next, as shown in FIG. 8, the molten metal 10 is supplied from the ladle 32 into the casting sleeve 9 at the L position. During this time, mold clamping is completed.

When the hot water supply is completed, the injection device 18 is set up vertically, the cylinder 15 is operated to raise the frame 14 and the casting sleeve 9, and the casting sleeve 9 is docked at the center of the lower end of the fixed mold 2. When the docking is completed, as shown in FIG. 1, the molten metal 10 is pushed up by the action of the injection cylinder 13 and the plunger tip 11, passes through the gate 21 containing the wire mesh 24, and is filled into the cavity 8 and pressurized. .

When the pressurization and cooling are completed, as shown in FIG.
As a result, the biscuit 33 as the feeder is cut off,
Be dropped. The dropped biscuit 33 is placed in the injection device 18
Is dropped and slid down on the chute 29 attached to the side of the, and is discharged to the outside. On the other hand, the mold is opened and the product 31
And complete one cycle. Next, the operation described above with reference to FIG. 6 starts, and thereafter, the above operation is repeated.

In the above-described embodiment, an example is shown in which both the gate spray device 27 and the wire netting device 28 are used. However, this does not necessarily mean that both must always be used. , Or only one of them can be used.

[0026]

According to the present invention, as described in the claims, a notch hole vertically penetrating the fixing plate is provided from the center of the fixing plate to both side end portions, and the side end portion is formed. The upper surface of the connecting portion is lower than the fixed mold mounting surfaces provided on both sides in a direction perpendicular to the side end portion side of the notch hole. It is provided so as to be movable laterally between hot water supply positions inside one of the ends, and a gate spray device or a wire mesh mounting device is provided laterally between the central portion and the other inside of the side end. Since it is movably provided, the hot water supply operation, the gate spray operation, and the wire mesh installation operation can be performed at the same position without any trouble without moving the fixed mold as the lower mold laterally.

Further, since the connecting portion at the side end of the fixed plate is made lower than the fixed die mounting surface, all operations can be performed while the fixed die is mounted on the fixed plate. There is no need for a table to move the mold laterally, so the space is small and the manufacturing cost is low. In addition, since the lateral movement time for the lower mold is not required, the cycle time is shortened and the productivity is improved.

Also, by mounting a biscuit discharging chute on the side of the tilting injection device, the biscuit cut and dropped by the center pin from the lower part of the fixed mold falls onto the chute without colliding with the injection cylinder. , Is discharged.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, showing a state during injection filling.

FIG. 2 is a plan view showing one embodiment of the fixed plate of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a longitudinal sectional view showing one embodiment of a mold part and a casting part of the present invention.

FIG. 6 is a longitudinal sectional view showing a state of taking out a product and spraying a mold gate according to the present invention.

FIG. 7 is a longitudinal sectional view showing a state where a wire net is attached according to the present invention.

FIG. 8 is a longitudinal sectional view showing a hot water supply state according to the present invention.

FIG. 9 is a longitudinal sectional view showing a biscuit cutting and discharging state according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed board 1a Central part 1b Side end part (connection part) 1c Upper surface of side end 1d Fixed die mounting surface 2 Fixed die (lower die) 3 Movable plate 4 Movable die 8 Cavity 9 Casting sleeve 11 Plunger Tip 13 Injection cylinder 18 Injection device 20 Notch hole 21 Gate 24 Wire mesh 25 Center pin 27 Gate spray device 28 Wire mesh mounting device 29 Chute 33 Biscuit

Claims (4)

(57) [Claims] A casting sleeve is detachably provided from below on a fixed mold attached to a fixed platen, and a casting sleeve having an injection plunger slidably inserted therein is horizontally mounted below the fixed mold. In a movable vertical die casting machine,
A notch hole vertically penetrating the fixing plate is provided from the center of the fixing plate to both side end portions, and the upper surface of the connecting portion, which is the side end portion, is perpendicular to the side end portion side of the notch hole. Lower than the fixed mold mounting surface provided on both sides, the casting sleeve can be moved laterally between the central part and one of the side ends inside the notch hole where hot water can be supplied. In addition to
A vertical die-casting machine provided with a gate spray device or a wire mesh mounting device so as to be able to move laterally between a central portion and the inside of the other side end. 2. An injection device having a casting sleeve mounted on an upper portion thereof is provided so as to be tiltable about a lower end side as a rotation center, and a biscuit discharge after casting is provided on a side surface of the injection device opposite to the tilting direction. The vertical die casting machine according to claim 1, wherein the chute is mounted. 3. A casting die sleeve is provided on a fixed die attached to a fixed platen so as to be detachable from below, and a casting sleeve slidably loaded with an injection plunger therein is horizontally inserted below the fixed die. In a movable vertical die casting machine,
A notch hole vertically penetrating the fixing plate is provided from the center of the fixing plate to both side end portions, and the upper surface of the connecting portion, which is the side end portion, is perpendicular to the side end portion side of the notch hole. Lower than the fixed mold mounting surfaces provided on both sides, the casting sleeve can be moved laterally between the central part and one of the side ends inside the notch hole where hot water can be supplied. In addition to
Using a vertical die casting machine provided with a gate spray device or a wire mesh mounting device so as to be able to move laterally between the center and the other inside of the side end, with the fixed die attached to the fixed platen When the casting sleeve is moved to a position where hot water can be supplied inside one of the side end portions, the gate spray device or the wire mesh mounting device is moved to the center portion so that the gate spray device is moved downward from the fixed mold. When the gate spraying device or the wire mesh mounting device is moved to the inside of the other of the side ends, the hot-water-supplied casting sleeve is moved to the center and docked to the lower part of the fixed mold. A casting method in a vertical die casting machine that performs a casting operation. 4. An injection device having a casting sleeve mounted on an upper portion thereof is provided so as to be tiltable about a lower end side as a rotation center, and is used for discharging a biscuit after casting on a side surface opposite to the tilting direction of the injection device. When the casting sleeve is moved to a position where hot water can be supplied inside one of the side ends, using a vertical die casting machine with a chute attached, and a gate spray device or a wire mesh mounting device is mounted at the center. Claims wherein, before being moved and a gate spray or a wire mesh is attached to the fixed mold from below, a biscuit at a lower portion of the fixed mold is dropped downward and slid on the chute to take out. A casting method in the vertical die casting machine according to claim 3.