JPH09323143A - Die device for die casting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die device capable of unnecessitating gate cutting work and making the gate small in size. SOLUTION: A nozzle body 11 and the die 20 are provided with a temp. adjustable heating means respectively. Since molten metal in the nozzle body 11 and the die 20 is held into easily fluidity state, the molten metal is passed through even a narrow gate part in the boundary between the runner gate part 22 and the product part 21 while holding good fluidity. In this result, the molten steel is smoothly charged in the die 20 and cooled and solidified. Thereafter, at the time of opening the die 20, the narrow gate part is broken and the runner gate part 22 and the product part 21 are separately taken out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die casting die apparatus capable of taking out a runner gate portion and a product portion of a molded product separated from each other when the mold is opened in sprueless injection molding of molten metal.

[0002]

2. Description of the Related Art FIG. 25 is a sectional view showing a general structure of a die casting machine. In FIG. 25, the machine nozzle 4 and the mold 7 of the die casting machine are about 1
It has an inclination of 0 degree, and the molten metal injection part 4a of the machine nozzle 4 has a molten metal surface 9 of the molten metal (molten metal 9) in the melting furnace 1.
It is arranged at a position higher than the height of a, and the molten metal injection part 4
It has a structure that prevents drooling from a.

When a product is formed by this die casting apparatus, first, a molten metal 9 melted in a melting furnace 1 is sent out by a plunger 3 reciprocating within a sleeve 2 and passes through a mechanical nozzle 4. Then, it is injected into the mold 7. The mold 7 includes a fixed plate 7a and a movable plate 7
b, and the molten metal injected from the mechanical nozzle 4 passes through the sprue bush 6 in the fixed plate 7a and is supplied to the product forming unit 8'formed by the fixed plate 7a and the movable plate 7b. The molten metal supplied to the product forming section 8 ′ is cooled by the mold 7 and solidified. After that, the movable plate 7b is moved in the direction of arrow A to open the mold 7,
The molded product 8 in which the product portion 8a, the gate portion 8b, the runner portion 8c, and the sprue portion 8d as shown in 7 are integrated is taken out.

The product portion 8a of the molded product 8 taken out becomes a product by being broken off from the gate portion 8b. At this time, if protrusion of the folded part of the product is not allowed, or if shape accuracy of the folded part of the product is required, file processing, cutting, etc. are applied to this part,
The shape is adjusted.

Further, as shown in FIG. 26, the sprue bush 6 in the die cast molding apparatus is cooled by the cooling water 31 circulating in the outer peripheral portion, and the sprue portion 8d due to insufficient cooling when the mold 7 is opened. It was designed to prevent premature disconnections. On the other hand, the mechanical nozzle 4
The outer peripheral portion was heated by the mechanical nozzle heater 5 so that the molten metal did not solidify in the mechanical nozzle 4. Further, the injection portion 4a of the mechanical nozzle 4 was set in a state of being pressed against the mechanical nozzle touch portion 6a of the sprue bush 6 so that the molten metal would not leak.

[0006]

In the above-mentioned conventional example, when the molded product 8 is taken out, the product portion 8a, the gate portion 8b, the runner portion 8c, and the sprue portion 8d are taken out in an integrated state. There is a problem that work such as gate folding for separating the gate portion 8b from the gate portion 8b is required.

If protrusion of the folded gate portion of the product is not allowed, or if the shape accuracy of the folded portion of the product is required, this portion is subjected to file processing or cutting to obtain the shape. Had to be prepared. In particular, since gate folding is generally performed manually, work efficiency is extremely poor.

In view of the above problems of the prior art, the present invention eliminates the need for gate folding work after molding if the product portion 8a and the runner portion 8c are separated when the die is opened in the die casting molding cycle. If the size can be reduced, the file processing and the cutting processing can be eliminated, and the cost can be reduced. An object of the present invention thus made is to provide a die casting die apparatus that does not require gate folding work and has a small gate.

[0009]

The die of the die casting die apparatus and the nozzle apparatus attached to the die according to the present invention are thermally insulated by a heat insulating material, and each has a heating means capable of adjusting the temperature. . Further, the temperature of the nozzle body in the nozzle device can maintain the melting temperature of the molten metal. Further, a constricted gate portion is provided at the boundary between the runner portion of the mold and the product portion. In such a mold apparatus, when the mold is opened, the narrowed gate portion is broken by the movement of the mold, and the product portion is separated from the runner portion at the gate portion.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In a die casting die apparatus according to the present invention, the nozzle apparatus and the die are heat-insulated and each has a heating means capable of adjusting the temperature. Therefore, the nozzle body can maintain the molten metal in a molten state, and the mold can be maintained at a mold temperature at which the molten metal easily flows when the molten metal is filled and solidifies in a short time after the molten metal is filled. In the mold device having such a structure, the molten metal in the nozzle body is kept in a molten state, and the mold temperature is kept in a state in which the molten metal easily flows. The molten metal passes through while maintaining good fluidity even at the gate portion which is greatly narrowed. As a result,
The molten metal is smoothly filled in the mold, and after it is cooled and solidified by the mold, when the mold opens, stress concentrates on this large constricted gate part and breaks from this part, and the runner part and product part Are taken out separately.

[0011]

FIG. 4 is a sectional view showing a first embodiment of a die casting mold of the present invention. FIG. 1 is a die casting machine shown in FIG. 4 mounted on a die casting machine to fill molten metal. It shows the state. The details of the nozzle section are shown in FIG.
14 to 14.

First, the structure of the nozzle portion will be described. FIG.
1 to 14, the nozzle plate 20a of the mold 20 is provided with a substantially cylindrical mounting hole 20d,
The nozzle body 11 is housed in the mounting hole 20d. The nozzle body 11 has a heat conductivity higher than that of heat-resistant steel or heat-resistant steel, for example, a heat conductivity of 0.25 cal / sec.
It is made of a tungsten alloy having a temperature of cm.degree. C. or more, and has a substantially cylindrical shape, and steps 11d and 1 are provided on the outer periphery near the tip 11a and the outer periphery near the mechanical nozzle touch portion 11c, respectively.
1e. That is, the central portion 11 of the nozzle body 11
The diameter b is set to be larger than that in the vicinity of the tip portion 11a and the mechanical nozzle touch portion 11c.

The heat insulating ring 12 is formed of a material having good heat resistance and low thermal conductivity, such as ceramics, and having a mechanical strength capable of withstanding pressing. The heat insulating ring 12 has a small diameter portion 12a that fits into the outflow side opening portion 20e of the mounting hole 20d, a large diameter portion 12b that abuts a step portion 20f provided inside the outflow side opening portion 20e, and this large diameter portion. And an annular recess 12c provided on the end surface of the portion 12b. Further, the inner diameter of the heat insulating ring 12 is
It is set so that it can be fitted onto the tip portion 11a of the nozzle body 11. This heat insulating ring 12 is, as shown in FIG.
The small diameter portion 12a is the mounting hole 20 of the nozzle plate 20a.
d is fitted in the outflow side opening 20e, and the large diameter portion 12b
Is a step portion 20f of the mounting hole 20d and a step portion 1 of the nozzle body 11.
It is installed so as to be sandwiched between 1d.

The heat-resistant gasket 14 is made of a soft material such as gold or copper, which has heat resistance to some extent, a metal O-ring such as a stainless O-ring, a metal C-ring such as a stainless C-ring, and the like. As shown in FIG. 14, it is formed to have a size that can be accommodated in the recess 12c and has a thickness that slightly protrudes from the recess 12c in the unpressed state.

The guide ring 13 has heat resistance, is fitted onto the nozzle body 11, and is positioned by being locked to the stepped portion 11e. The outer periphery of the guide ring 13 abuts the inner surface of the mounting hole 20d, and the nozzle It supports the main body 11 and positions the mechanical nozzle touch portion 11c at an appropriate position.
The guide ring 13 is fitted in the mounting hole 20d in a state of being slidable in the mounting hole 20d in the axial direction.

The back plate 15 is fixed to the nozzle plate 20a with screws 16 in order to prevent the nozzle body 11 and the guide ring 13 from falling out of the mounting hole 20d. The back plate 15 is provided with a hole 15a slightly larger than the outer diameter of the mechanical nozzle touch portion 11c of the nozzle body 11, and this hole 15a is provided.
The mechanical nozzle touch portion 11c of the nozzle main body 11 is set to slightly project from.

The heater 18 is attached to the outer peripheral portion of the nozzle body as a heating means for heating the nozzle body 11. The heater 18 has a temperature detection unit inside and controls the temperature of the nozzle body 11. Reference numeral 18a shown in FIG. 13 is a lead wire of the heater 18, which is connected to a temperature control device (not shown).

As shown in FIG. 14, when the mechanical nozzle touch portion 11c of the nozzle body 11 is not touching the mechanical nozzle, the heat resistant gasket 14 is not pressed and is not compressed. . Here, as shown in FIGS. 1 and 11, when the mechanical nozzle 4 touches the mechanical nozzle touch portion 11c of the nozzle body 11 and the nozzle body 11 is pressed by the mechanical nozzle 4, the heat-resistant gasket 14 becomes It is compressed between the heat insulating ring 12 and the nozzle body 11, and seals the molten metal so that it cannot pass through the gap 17 a between the heat insulating ring 12 and the nozzle body 11. Since the mold temperature is much lower than the temperature of the molten metal, when the molten metal comes into contact with the mold, it does not solidify and flow into the gap 17b between the heat insulating ring 12 and the mold. Therefore, even if no gasket is provided between them, the molten metal can be prevented from flowing in only by reducing the gap.

Further, as shown in FIGS. 15 to 17, a threaded portion 12e is provided on the inner peripheral surface of the heat insulating ring 12, and the threaded portion 12e is provided on the outer periphery of the nozzle body 11 near the tip 11a. Nozzle body 1 by screwing into
It may be fixed at 1. In this nozzle device, an annular recess 11g is provided on the stepped portion 11d of the nozzle body 11, and the heat resistant gasket 14 is housed therein. In the case of this structure, the gasket 14 between the heat resistant ring 12 and the nozzle body 11 can be compressed without being pressed by the nozzle touch. The nozzle body 1
1 is a stepped portion 20g provided in the mounting hole 20d, and a projecting portion 11h provided on the outer circumference of the nozzle body is sandwiched and supported by a guide ring 32 that is locked here and a guide ring 33 having the same diameter as this. ing.

Next, the structure of the mold 20 will be described. As shown in FIGS. 1 and 4, the mold 20 includes a nozzle plate 20a to which the nozzle device is attached, and a runner plate 20b that abuts the nozzle plate 20a.
Further, it is composed of a cavity plate 20c that abuts the runner plate 20b. As described above, the nozzle plate 20a is provided with the mounting hole 20d, and the nozzle device is mounted therein. Further, the push pin 25 is provided on the nozzle plate 20a.
Is provided with a through hole 20h for inserting the through hole 20h.
Are formed to have a truncated cone shape whose outer diameter is reduced. Further, the runner plate 20b has a concave mold runner flat surface portion 22a 'which is formed on the surface on the nozzle plate 20a side and communicates with the tip of the nozzle body 11 and the opening portion 20h of the through hole 20h, and this mold runner flat surface. A mold runner conical portion 22b 'having a conical shape communicating with the portion 22a', a constricted mold gate portion 22c 'at its tip, and a mold gate portion 22c' formed on the surface on the side of the cavity plate 20c. And a cup-shaped mold product portion 21 'which is in the form of a cup in this embodiment.
And In addition, the die runner plane portion 22
The mold runner portion is constituted by a'and the mold runner cone portion 22b '. Further, the cavity plate 20c is
Mold protrusion 21 that protrudes into the mold product portion 21 'of the runner plate 20b and forms the inner surface of the product in this embodiment.
a'and a through hole 26 'into which the push-out pin 26 for pushing the product out of the mold is inserted.

Further, as shown in FIGS. 9 and 10, the mold 20 is provided with a mold heater 23 as a heating means on its outer surface in order to secure the fluidity of the molten metal in the mold. The mold heater 23 is controlled by a temperature detector 24 attached to the mold 20 and a temperature controller (not shown).

Next, the steps in the case of performing die casting with the mold device having the above-mentioned structure will be described. First, when die casting is started in the state shown in FIGS. 1 and 4, the molten metal passes through the inside of the nozzle body 11 which is heated by the nozzle heater 18 and kept at a constant temperature, and the die runner flat surface portion 22a ′, Mold runner cone 22b '
And it passes through the narrowed mold gate part 22c 'and is filled in the mold product part 21'. The molten metal thus filled in the mold product portion 21 ′ of the mold 20 is cooled and solidified.

Thereafter, as shown in FIG. 5, the runner plate 20b and the cavity plate 20c move integrally in the direction of arrow A, and the space between the runner plate 20b and the nozzle plate 20a is opened. At this time, the constricted gate part 22c solidified in the constricted mold gate part 22c 'is broken by tensile stress, and the mold runner flat part 22a' is broken.
And, the runner gate portion 22 solidified in the die runner cone portion 22b 'remains in the nozzle plate 20a side. The runner gate portion 22 has a shape in which the solidified portion in the opening 20i of the through hole 20h of the nozzle plate 20a does not come off from the opening 20i. Therefore, the runner plate 20b and the cavity plate 20c have the same shape. It will remain on the nozzle plate 20a side during movement.

Further, as shown in FIG. 6, when the runner plate 20b and the cavity plate 20c are integrally moved further in the direction of arrow A and the push pin 25 is moved in the direction of arrow B, the runner gate portion 22 is It is pushed out from the nozzle plate 20a by the push-out pin 25.
Then, the runner gate portion 22 falls out of the mold due to its own weight.

Thereafter, as shown in FIG. 7, the cavity plate 20c moves in the direction of arrow A, and the space between the runner plate 20b and the cavity plate 20c is opened. Further, as shown in FIG. 8, the cavity plate 20c moves in the direction of arrow A and the push-out pin 26 moves in the direction of arrow C, so that the product portion 21 moves to the cavity plate 20c.
It is pushed out of the mold and falls out of the mold by its own weight.

As described above, the molded product is not taken out while the product portion and the runner gate portion are integrated as in the conventional example, but is separated and dropped separately. The dropped product portion 21 and the runner gate portion 22 are as shown in FIGS. 2 and 3, and the sprue portion as in the conventional example is not formed in the molded product, that is, the product portion 21.

As described above, when the molded product is taken out,
The temperature of the tip portion 11a of the nozzle body 11 is
The temperature of the central portion 11b of the nozzle is rapidly recovered to an appropriate temperature at which it can be molded, and heat is supplied by the nozzle heater 18 on the outer peripheral portion of the nozzle body 11. If a material having a high thermal conductivity is used for the nozzle body 11, it is possible to supply heat more rapidly.

FIG. 18 shows a mold device according to a second embodiment of the mold device of the present invention, in which the runner gate part 22 is located on the side surface of the product part 21. Shows. Also in this embodiment, the molding process is the same as that of the previous embodiment. That is, when die casting is started in the state shown in FIG. 18, the molten metal passes through the inside of the nozzle body 11 which is heated by the nozzle heater 18 and kept at a constant temperature, and the die runner flat portion 2
8a ', the die runner conical portion 28b', and the constricted die gate portion 28c 'are filled into the die product portion 27', and further cooled and solidified.

After that, as shown in FIG. 19, the runner plate 20b and the cavity plate 20c move integrally in the direction of arrow A, and the space between the runner plate 20b and the nozzle plate 20a is opened. At this time, the constricted gate portion 28c solidified in the constricted mold gate portion 28c '.
Is broken by pulling and shearing, and the mold runner flat portion 28
The a'and the runner gate portion 28 solidified in the die runner conical portion 28b 'remain on the nozzle plate 20a side. At this time, the runner cone 28b solidified in the mold runner cone 28b 'is
Mold runner cone 2
It is preferable to set the angle 8'of 8b 'to an angle close to 90 degrees. Further, the angle θ of the runner cone portion 28b is slightly larger than the angle θ ′ of the mold runner cone portion 28b ′ due to the deformation at the time of forced removal. In addition, the runner gate portion 28 is formed in the through hole 20 of the nozzle plate 20a.
The solidified portion in the opening 20i of h is the opening 20i.
Since the shape does not come off from i, it will remain on the nozzle plate 20a side when the runner plate 20b and the cavity plate 20c are moved.

Further, as shown in FIG. 20, when the runner plate 20b and the cavity plate 20c are integrally moved further in the direction of arrow A and the push pin 25 is moved in the direction of arrow B, the runner gate portion 22 is It is pushed out from the nozzle plate 20a by the push-out pin 25. Then, the runner gate portion 28 falls out of the mold due to its own weight.

Then, as shown in FIG. 21, the cavity plate 20c moves in the direction of arrow A, and the space between the runner plate 20b and the cavity plate 20c is opened.
Further, as shown in FIG. 22, the cavity plate 20
c moves in the direction of arrow A, the push pin 26 moves in the direction of arrow C, and the product portion 27 moves to the cavity plate 2
It is pushed out from 0c and falls out of the mold by its own weight.

As described above, as in the first embodiment, the molded product is not taken out while the product part and the runner gate part are integrated as in the conventional example, but is separated and separated. Will fall to. The dropped product portion 27 and runner gate portion 28 are as shown in FIGS. 23 and 24, and the product portion 27 does not have the sprue portion as in the conventional example.

[0033]

According to the present invention, the conventionally used sprue bush is abolished, and a hot nozzle that is heat-insulated from the mold and temperature-controlled is used to further maintain proper fluidity of the mold. Since the temperature is controlled at 1, the molten metal can be passed through the narrowed gate portion and filled into the product portion even if the narrowed gate portion is provided near the product portion. As a result, the constricted gate portion is broken by the opening of the mold, so that the work of cutting the gate, which is indispensable in the conventional method, can be eliminated. Further, since the gate can be made small, there is almost no remaining gate in the product part, and finishing work such as file working and cutting work is unnecessary.

Further, in the molding of small parts by the conventional apparatus, the sprue portion of the molded product occupies a large proportion, the product portion occupies a small proportion, and the quality of the product portion tends to be unstable. According to the invention, since the sprue portion is eliminated, extremely stable molding can be performed. Furthermore,
The amount of return material is reduced by the amount corresponding to the sprue portion, and the cost of remelting can be reduced. In the present invention, a runner cone is formed, but this runner cone can have a much smaller volume than the sprue, and the return material can be greatly reduced. is there.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a die casting die device according to a first embodiment of the present invention is attached to a die casting machine.

FIG. 2 is a cross-sectional view of a product portion molded by the die casting die device shown in FIG.

FIG. 3 is a side view of a runner gate portion formed by the die casting mold device shown in FIG.

FIG. 4 is a cross-sectional view showing only the die casting die device shown in FIG. 1.

5 is a cross-sectional view showing a state where a runner plate and a cavity plate of the die casting mold device shown in FIG. 4 are moved.

6 is a cross-sectional view showing a state where the push pin shown in FIG. 5 is moved.

7 is a cross-sectional view showing a state where the cavity plate shown in FIG. 6 is moved.

8 is a cross-sectional view showing a state where the push pin shown in FIG. 7 is moved.

9 is a front view of the die casting die unit shown in FIG. 4. FIG.

10 is a side view of the die casting mold device shown in FIG. 4. FIG.

FIG. 11 is an enlarged cross-sectional view of an essential part showing a state where the nozzle device shown in FIG. 1 is touching the nozzle.

12 is a rear view of the nozzle device shown in FIG. 11. FIG.

13 is a front view of the nozzle device shown in FIG.

FIG. 14 is an enlarged cross-sectional view of an essential part showing a state in which the nozzle device shown in FIG. 11 does not touch the nozzle.

FIG. 15 is an enlarged sectional view of an essential part showing a partially modified example of the nozzle device shown in FIG.

16 is a rear view of the nozzle device shown in FIG.

FIG. 17 is a front view of the nozzle device shown in FIG.

18 is a cross-sectional view showing a second embodiment of the die casting mold device shown in FIG.

FIG. 19 is a cross-sectional view showing a state where the runner plate and the cavity plate of the die casting mold device shown in FIG. 18 are moved.

20 is a cross-sectional view showing a state where the push pin shown in FIG. 19 is moved.

21 is a cross-sectional view showing a state where the cavity plate shown in FIG. 20 is moved.

22 is a cross-sectional view showing a state where the push pin shown in FIG. 21 is moved.

23 is a cross-sectional view of a product portion molded by the die casting die device shown in FIG.

FIG. 24 is a side view of a runner gate portion molded by the die casting mold device shown in FIG. 18.

FIG. 25 is a cross-sectional view showing a conventional die casting nozzle device.

26 is an enlarged cross-sectional view of the sprue bush shown in FIG. 25.

27 is a side view showing a molded product molded by the die casting nozzle device shown in FIG. 25. FIG.

[Explanation of symbols]

 1 Melting Furnace 2 Sleeve 3 Plunger 4 Mechanical Nozzle 5 Mechanical Nozzle Heater 6 Sprue Bushing 7 Mold 8 Molded Product 9 Molten Metal 11 Nozzle Body 12 Insulation Ring 13 Guide Ring 14 Insulation Gasket 15 Back Plate 18 Heater 20 Mold 20a Nozzle Plate 20b Runner plate 20c Cavity plate 21, 27 Product part 21 ', 27' Mold product part 22, 28 Runner gate part 22a, 28a Runner flat part 22b, 28b Runner conical part 22c, 28c Gate part 22a ', 28a' Mold Runner flat surface part 22b ', 28b' Mold runner cone part 22c ', 28c' Mold gate part 23 Mold heater 24 Temperature detector 25, 26 Extrusion pin

Claims (2)

[Claims] 1. A molten metal comprising: a mold having a temperature-adjustable heating means; and a temperature-adjustable heating means attached to the mold in a heat-insulating state via the mold and a heat insulating material. In a mold device equipped with a nozzle device that can be kept in a state, the narrowed gate part between the runner part and the product part provided in the molded product formed by this mold causes the mold to move when the mold is opened. A die-casting die device that can be taken apart by separating the runner gate part and the product part. 2. A nozzle plate to which a nozzle device having a heating means capable of adjusting temperature is attached in a heat-insulating state via a heat insulating material, and a mold runner portion which is in contact with the nozzle plate and communicates with the nozzle device. A runner plate having a mold product part communicating with the mold runner part, and a mold gate part constricted between the mold runner part and the mold product part, and a cavity contacting the runner plate. A die casting mold apparatus comprising: a plate; and heating means for adjusting the temperatures of the nozzle plate, the runner plate and the cavity plate.