JPH0219746B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a die-casting device, and more particularly, to a die-casting device, when molten metal is injected into a mold, a duct serving as a passage and a plunger sleeve for pushing the molten metal into a cavity are provided. The present invention relates to a die-casting apparatus having an adapter provided therebetween and a heater disposed inside the adapter so that the molten material is not cooled during the pouring process.

A die-casting device that presses molten metal into a mold to produce a product uses a tubular duct to introduce the molten metal into a cavity. In other words, when the molten metal is taken into the main body of the die-casting device, such as a container or a furnace that stores the molten metal, the use of the duct allows the molten metal to move extremely smoothly and in a short time, so that it is difficult for the product to move. It is said that there is less contamination of foreign substances, gases, etc., and therefore high efficiency and high quality products can be obtained.

However, in this type of die-casting apparatus, the tip of the duct is configured to directly contact the low-temperature sleeve, so the relatively low-temperature sleeve absorbs heat from the molten metal, resulting in a low temperature. As a result, there is a risk that the molten metal will solidify inside the duct and adhere to the wall of the duct. In other words, the solidified material blocks the hole in the duct, causing an interruption in the operation of the die-casting equipment, which is an inconvenience in that a series of automated die-casting processes is stopped, even if only temporarily. There is. Moreover, in order to remove such stuck material from the duct, it is necessary to remove the relevant parts from the sleeve one by one, which is extremely cumbersome and requires manual labor. Furthermore, in order to avoid such inconveniences, if a preliminary operation is performed to preheat the die-casting equipment, the time required for this is extremely long. However, the problem was that the burden increased.

Due to the above-mentioned drawbacks, it has been pointed out that the conventional die-casting apparatus has the disadvantage that handling during the pouring process is extremely complicated.

Therefore, as a result of extensive research and efforts, the inventors of the present invention have developed a duct for guiding the melting material toward the mold, and a system for transporting the material sent from the duct toward the mold via a plunger. If an adapter is provided between the sleeve and a heater is provided inside the adapter, the heat of the heater will raise the adapter to a predetermined temperature.
Therefore, it has been found that the molten material conveyed from the duct is smoothly led out to the sleeve without solidifying at the tip of the duct, thereby eliminating the above-mentioned disadvantages.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a die-casting device having a simple structure and having an adapter capable of smoothly transporting molten material fed from a duct to a mold without solidifying it.

To achieve the above object, the present invention provides a die casting apparatus including a sleeve for feeding molten material through a plunger into a cavity defined in a mold, in which a hole is formed in one side of the sleeve. ,
An adapter is fitted into the hole via a cylindrical protrusion, a passage formed in the adapter is communicated with a duct extending from a container or a furnace, and a heater is installed inside the adapter. shall be.

Next, preferred embodiments of the die casting apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a movable plate constituting the die-casting device, and reference numeral 12 indicates a fixed plate. Movable plate 10
A movable mold 14 is fixed to the fixed plate 12, while a fixed mold 16 is fixed to the fixed plate 12. The movable mold 14 and the fixed mold 16 define a cavity 18 for obtaining a die-cast product when joined together. Therefore, a sleeve 20 is provided that passes through the fixed plate 12 and the fixed mold 16 and reaches the cavity 18. That is, the sleeve 2
One end of 0 faces the cavity 18, while
The other end of the sleeve 20 is exposed to the outside of the fixing plate 12. A thin wall portion 22 is formed at the other end of the sleeve 20, and a circular hole 24 is defined in the thin wall portion 22 (see FIG. 2). When forming the hole 24, as shown in FIG. 3, a taper 26 is formed that widens outward, and this portion is used as a shoulder 28.

Therefore, an adapter 30 that fits into the hole 24 and is interposed between the sleeve 20 and a duct, which will be described later, will be explained. As can be easily understood from FIG. 4, the adapter 30 has a rectangular parallelepiped body 3 having an inclined surface 32 and made of a material with high thermal conductivity.
4, and pedestals 36a, 36b, 36c and 36d are formed on the front portion 34a of the body 34 and spaced apart from each other by a predetermined distance. Furthermore, the pedestal 36
A cylindrical protrusion 38 facing into the hole 24 of the sleeve 20 is fixed between a, 36b and 36c, 36d. In this case, the outer diameter D of the cylindrical protrusion 38 is larger than its length L, preferably L/
Select so that D is 0.6 or less (see Figure 2). As can be easily understood from FIG. 1, the passage 40 formed by the cylindrical projection 38 reaches inside the body 34, bends from there, and reaches the inclined surface 32 side. A recess 42 having an arcuate cross section is formed in the inclined surface 32 . On the other hand, a hole 44 passing through the body 34 is formed in the side wall 34b of the body 34, and a first electric heater 46 is fitted into the hole 44. Furthermore, a hole 48 is similarly formed below the hole 44, and this hole 48 terminates at approximately the center of the body 34. A second electric heater 50 is fitted into the hole 48 .
Furthermore, a hole 54 is formed in the other side wall 34c of the body 34, and this hole 54 also terminates at a substantially central portion of the body 34. A third electric heater 56 is fitted into the hole 54 .

When the body 34 configured as described above is fitted with the cylindrical protrusion 38 into the hole 24, its tip portion coincides with the thin wall portion 22 of the sleeve 20, and the plunger 58 reciprocates within the sleeve 20. A passage 60 is formed for the pedestals 36a to 36d.
is in contact with the thin wall portion 22 . Moreover, according to the present invention, the tapered portion 26 at the shoulder portion 28 of the sleeve 20
, the pedestals 36a to 36d substantially remain in line contact with the tip of the tapered portion 26 of the thin portion 22. This is to prevent heat radiation.

Next, the duct 62 that engages with the adapter 30 configured as described above will be explained.

The duct 62 basically includes a cylindrical duct body 64 and an electric heater 66 wound around the cylindrical duct body 64. The tip of the duct body 64 is the adapter 30
The distal end itself is bulged into a spherical shape so as to engage with the recess 42 of the (see FIG. 1).

The present invention is basically constructed as described above, and its operation and effects will be explained next.

First, the movable plate 10 is displaced in the direction of arrow A via a mold clamping mechanism (not shown). As a result, the movable mold 14 joins with the fixed mold 16, and a cavity 18 is defined there. Therefore, the plunger 58
is placed on standby at the position shown in FIG. 1, and molten material 70 is fed to the duct 62 from a container or furnace (not shown). At this time, the heater 66 has already heated the duct body 64 to a temperature slightly higher than the melting point of the molten material, and the first electric heater 46, second electric heater 50, and third electric heater 56 of the adapter 30 are energized. Similarly to the above, this adapter 30 is also heated to a temperature slightly higher than the melting point of the molten material 70. Therefore, the molten material 70 is extremely smoothly led out from the duct body 64 toward the passage 60 in the sleeve 20 without being cooled and solidified. Then, when the plunger 58 is energized, the tip moves through the passageway 60 of the sleeve 20 and forces the molten material 70 into the cavity 18. In order to maintain the movable mold 14 and fixed mold 16 that define the cavity 18 at a considerably lower temperature than the molten material 70, the molten material 70 is formed into a predetermined product according to the shape of the cavity 18. It turns out. Next, the product obtained as a result of cooling in this manner is removed from the mold by displacing the movable plate 10 in the direction of arrow B.

Therefore, in the above configuration, the adapter 30 and the sleeve 20 are in contact only through the pedestals 36a to 36d and the side wall portion of the cylindrical protrusion 38.

That is, heat is conducted from the body 34 heated by the first electric heater 46, the second electric heater 50, and the third electric heater 56 to the lower temperature sleeve 20 only through the base and the cylindrical protrusion. will be carried out. Therefore, the amount of heat emitted by the adapter 30 can be minimized. This means that the adapter 30 can always maintain a temperature slightly higher than the melting point of the molten material and therefore there is no possibility of the molten material 70 introduced from the duct 62 solidifying in said adapter part. . Moreover, according to the present invention, as described above, the length L of the cylindrical protrusion 38 is set to the diameter D.
Since L/D is selected to be smaller than 0.6, in other words, the heat radiation in the non-contact portion between the adapter 30 and the sleeve 20 can be made extremely small. Therefore, the cylindrical protrusion 3
There is an advantage in that the temperature of the tip of 8 can be maintained at a predetermined value.

According to experiments, when the length L of the cylindrical protrusion 38 is larger than its diameter D, the outer circumferential temperature θ ₁ at the end of the cylindrical protrusion 38 and the inner circumferential temperature at the tip of the passage 40 of the cylindrical protrusion 38 The ratio θ ₂ /θ ₁ of θ ₂ has a value close to 1, and it is not easy to increase θ ₂ . On the other hand, when L is short, θ ₂ /θ ₁ becomes 2 to 3, making it relatively easy to increase θ ₂ . As shown in FIG. 7 with the ratio L/D of the length L of the cylindrical protrusion 38 and its diameter D on the horizontal axis and θ ₂ /θ ₁ on the vertical axis, when the value of L/D is around 0.6, θ ₂ /θ ₁ increases rapidly (see Figure 7). Therefore, for effective heating, it is necessary to set L/D to about 0.6, and in this case,
The adapter 30 may be made of commercially available heat-resistant steel.

According to the present invention, the molten material can be transported toward the mold with an extremely simple configuration as described above without solidifying during the transport. Furthermore, since the thermal radiation can be kept as low as possible in relation to the contacting sleeve, the molten material is also transferred smoothly, so that in particular electric heaters with a large amount of generation can be used, and also the adapter 30 There is no need to make the material itself from a material with particularly high thermal conductivity. That is, it is possible to obtain an adapter that has an extremely simple configuration, is suitable for miniaturization, and can be manufactured at low cost. For example, the total output of an electric heater is
In an example of a die-casting machine that handles 0.5KW aluminum alloy, the cylindrical protrusion of the adapter has the required temperature.
The time it takes to reach 600℃ is extremely short at 12 minutes.
Therefore, the preliminary operation time of the die casting apparatus can be shortened.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that various improvements and design changes can be made without departing from the gist of the present invention. It is.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing the correlation between the sleeve, adapter, and duct of the die-casting device according to the present invention, FIG. 2 is an enlarged vertical cross-sectional view of the joint portion of the sleeve and adapter shown in FIG. 1, and FIG. 1 is an enlarged cross-sectional view showing the joined state of the sleeve and adapter shown in FIG. 1, FIG. 4 is a partially omitted perspective view of the adapter, FIG. 5 is a plan view of the adapter shown in FIG. 4, and FIG.
7 is a sectional view taken along the - line in the figure, and FIG.
It is a graph showing the relationship between D and temperature θ ₂ /θ ₁ . 10...Movable plate, 12...Fixed plate, 14...Movable mold, 16...Fixed mold, 18
...Cavity, 20...Sleeve, 22...Thin wall part, 24...Hole part, 26...Tapered part, 28...
... piece, 30 ... adapter, 34 ... body, 3
6a to d...Pedestal, 38...Cylindrical protrusion, 40...
...passage, 42...recess, 44...hole, 46...
First electric heater, 48... hole, 50... second electric heater, 54... hole, 56... third electric heater, 58... plunger, 60... passage, 62...
...Duct, 64...Duct body, 66...Heater, 70...Melting material.

Claims (1)

[Scope of Claims] 1. A die casting device including a sleeve that feeds molten material to a cavity defined in a mold via a plunger, wherein a hole is formed in one side of the sleeve, and a hole is formed in the hole. fitting an adapter through a cylindrical protrusion and communicating a passage formed in the adapter with a duct extending from the container or furnace;
The die casting apparatus further comprises a heater installed inside the adapter. 2. In the device according to claim 1,
A die-casting device comprising: a pedestal for the adapter; the pedestal is brought into contact with a side of the sleeve to hold the adapter body between the sleeve and the duct. 3. In the device according to claim 2,
A die-casting device in which one side of the sleeve that holds the adapter is thinner than the remaining part. 4. A die-casting device according to claim 2 or 3, wherein the hole in the sleeve is tapered, and the pedestal is in point or line contact with the tapered part. 5. In the device according to any one of claims 1 to 4, the length L of the cylindrical protrusion in the axial direction is smaller than the length D of the outer diameter of the cylindrical protrusion. Die casting equipment of your choice. 6. In the device according to claim 5,
A die casting device in which the ratio of the length D of the diameter of the outer diameter portion to the length L in the axial direction of the cylindrical protrusion is selected to be 0.6 or less.