JP2001293547A - Die casting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize thin casting from a viewpoint temperature by preventing the temperature-drop of a metallic mold sleeve through fixing the metallic mold sleeve only to the metallic mold and separating it from a fixed die plate. SOLUTION: In a fitting structure of the metallic mold sleeve (4) disposed between the fixed die plate (1) and the fixed metallic mold (2) and with a piston (6) inserted thereto reciprocatively movably, the metallic mold sleeve (4) is fixed to the fixed metallic mold (2) and the fixed die plate side end part (4b) of the metallic mold sleeve (4) is disposed in the fixed die plate (1) through a heat-insulating layer (11).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a metal (Al, Mg, Zn, etc.)
The present invention relates to a die casting machine which is particularly excellent in thin die casting.

[0002]

2. Description of the Related Art Recently, with the spread of information terminal devices such as notebook personal computers, palm personal computers, and mobile phones, their size and weight have been reduced at a geometric speed. For metal die-cast products used in these small and lightweight terminal devices, thin and sound components which have never been considered before have been required.

[0003] In order to mold such a particularly thin-walled die-cast product, a conventional die-casting machine could not be used at all. This is because, as shown in FIGS. 8 and 9, a conventional die casting machine includes a mold sleeve (54a) in which a hot water supply sleeve (54) is mounted in a fixed mold (52), and a fixed die plate (51). It is composed of two members of a machine sleeve (54b) arranged in a, and a hot water supply port (55) is drilled in a protruding portion (54c) of the machine sleeve (54b) from the fixed die plate (51),
Metal hot water nozzle (5
From 8), the molten metal (60) was supplied to the hot water supply sleeve (54).

When the wall thickness is large, such as a conventional die-cast product, the amount of molten metal is large, so that even if the entire length of the hot water supply sleeve (54) is long, the molten metal filling rate is sufficiently large and the injection speed is not so high. The temperature drop of the molten metal in the hot water supply sleeve (54) is also small. However, if the demand for thinning is increasing, and the use of new materials such as Mg is required for die casting,
Reduction of the filling rate of the molten metal in the hot water supply sleeve (54), demand for higher speed injection, lowering of the temperature of the molten metal in the hot water supply sleeve (54), etc.
A broad response is required. In particular, a decrease in the temperature of the molten metal in the hot water supply sleeve (54) causes hot water wrinkles and poor running of the molten metal, and a new material such as Mg causes a fatal problem of thinning.

The conventional hot water supply sleeve (54) is divided into two members, a mold sleeve (54a) and a machine sleeve (54b), as described above, each of which is a fixed mold (52) and a fixed die plate (51). ), The heat transmitted from the fixed mold (52) held at a predetermined high temperature to the hot water supply sleeve (54) escapes to the cold fixed die plate (51), and the hot water supply sleeve (54) The temperature tends to be lower than the temperature of the mold (52), and the temperature of the molten metal (60) supplied to the hot water supply sleeve (54) also tends to decrease accordingly.

[0006]

The problem to be solved by the present invention is as follows.
By fixing or contacting the mold sleeve only to the mold side and cutting off the edge from the fixed die plate side, the temperature of the mold sleeve is prevented from dropping, which contributes to the realization of a thinner wall in terms of temperature. .

[0007]

According to a first aspect of the present invention, there is provided a die casting machine (A) comprising (a) a fixed die plate (1) and a fixed mold (2); A die casting machine (A) disposed in a communication hole (3) formed in communication with each other, and a piston (6) is reciprocally inserted into a mold sleeve (4), (b) ) Mold sleeve (4) is fixed mold
The fixed die plate side end (4b) of the mold sleeve (4), which is fixed in contact with (2) and is separated from the fixed die plate (1) through the heat insulating layer (11). I do.

[0008] A die casting machine according to claim 2
(A) is a second embodiment of the present invention, wherein (a) a fixed die plate
A communication hole formed so as to communicate with (1) and the fixed mold (2).
A die casting machine (A) disposed in (3), in which a piston (6) is reciprocally inserted, and (b) a mold sleeve (4) is fixed to a fixed mold (2). And mold sleeve (4)
The fixed die plate side end (4b) is disposed in the fixed die plate (1) via the heat insulating layer (11).

Claim 3 is an example of the heat insulating layer (11) according to claim 1 or 2, wherein the heat insulating layer (11) is provided between the mold sleeve (4) and the fixed die plate (1). The gap (11a) is provided.

[0010] Claim 4 is a heat insulating layer according to claim 1.
(11) Another example is characterized in that the heat insulating layer (11) is constituted by a heat insulating material (11b) provided between the mold sleeve (4) and the fixed die plate (1). .

In each of these embodiments, the mold sleeve (4) is cut off from the fixed die plate (1) by a heat insulating layer (11) such as a gap (11a) or a heat insulating material (11b). And the heat transmitted from the fixed mold (2) stays in the mold sleeve (4),
It is kept at almost the same temperature as the fixed mold (2). As a result, the temperature of the molten metal (10) supplied to the mold sleeve (4) can be avoided, and it is possible to cope with thinning and die-casting of a new material such as Mg.

Here, as the mold sleeve (4), FIG.
5 to 7 which are clamped and fixed between the fixed die plate (1) and the fixed mold (2), and the fixed mold (2) as shown in FIGS.
And is cut off from the fixed die plate (1) by a gap (11a) or a heat insulating layer (11) such as a heat insulating material (11b).

According to a fifth aspect of the present invention, there is provided the die casting machine according to any one of the first to fourth aspects, wherein the fixed die plate (1) and the fixed mold (2) are insulated by a heat insulating material (11). Has been done. "
This makes it difficult for heat to be transferred from the fixed die (2), which is maintained at a predetermined temperature, to the fixed die plate (1), which has a lower temperature. ) Can be prevented from lowering.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. 1 to 4 show a first embodiment, in which a fixed die plate is used.
A fixed mold (2) is fixed to (1). Fixed die plate
(1) and the fixed mold (2) on the fixed side
(3) is formed, and the mold side end (4
a) is fitted into the communication hole (3a) on the fixed mold (2) side, is exposed on the parting surface (2a) side of the fixed mold (2) on the fixed side, and is opposite to the die plate side. The end (4b) is fitted in the communication hole (3b) of the fixed die plate (1), and the piston (6) is disposed at the die plate side end (4b) so as to be able to reciprocate.

The mold sleeve (4) is a cylindrical one having an outer flange (14) provided on the outer periphery thereof, and the outer flange (14) portion is recessed on the back surface of the fixed mold (2). The mounting recess (15a) and the mounting recess (15b) recessed on the mold mounting surface (1a) of the fixed die plate (1) are fitted through a heat insulating material (11b) into the mounting recess (15b). Type
By fixing (2) to the fixed die plate (1) with a fastener such as a bolt, it is clamped and fixed between the mounting concave steps (15a) (15b). And the fixed die plate of the fixed mold (2)
Positioning with respect to (1) is performed by a mold sleeve (4) which is sandwiched and fixed between the mounting concave steps (15a) (15b).

In the case of this embodiment, a heat insulating material (11b) is provided between the fixed die plate (1) and the rear surface of the outer flange (14) and the die plate side end (4b) of the mold sleeve (4). ) Are provided and are thermally cut off from each other. This prevents the transfer of heat from the mold sleeve (4) to the fixed die plate (1).

Also, in the case of the present embodiment, since the aim is to manufacture a thin-walled die-cast product, if the structure of the mold sleeve (4) is slightly touched, the length (L) of the hot water supply portion becomes larger than in the conventional case. Very short. That is, in this embodiment, the die plate side end (4b) of the mold sleeve (4) is located in the communication hole (3b) of the fixed die plate (1) unlike the conventional example of FIG. I have. (Although not shown, of course, if the die plate side end (4b) is cut off from the fixed die plate (1), the die plate side end (4b) will be fixed die plate as in the conventional example. It may project from (1) or the communication hole (3
It may be the same as b). Also, the hot water supply port (5) formed in the mold sleeve (4) is located in the fixed die plate (1) or in the communication hole (3a) on the fixed mold (2) side as shown in FIG. And
In addition, the tip of the piston (6) substantially coincides with the hot water supply port (5), and this position is the retreat limit.

In this case, for example, a hot water supply means (8) such as a hot water supply nozzle enters the fixed die plate (1) and
(5), the slot (7a) for storing the hot water supply means (8) must be fixed die plate.
It is drilled in (1), and this part becomes a space (7) for hot water supply means insertion. The hot water supply means insertion space (7) is formed so as to be continuous with the communication hole (3b). The hot water supply means insertion space (7) may be penetrated so as to open to the mold mounting surface (1a) like a long hole (7a), but the hot water supply means does not open to the mold mounting surface (1a).
You may just dig into the depth where (8) can be stored.

Next, the operation of the first embodiment will be described. As shown in FIG. 1, the piston (6) is located at the retreat limit, and in this state, the molten metal (1) such as Al, Mg, Zn or the like is placed in the mold sleeve (4).
0) is supplied from the molten metal nozzle (8). Since the length (L) of the hot water supply part of the mold sleeve (4) is sufficiently shorter than the conventional one, if the same hot water supply amount is used, the sleeve filling rate will be higher than in the conventional example, and the contact area with the outside air And the amount of oxidation of the molten metal (10) also decreases. In this embodiment, the mold sleeve (4) is thermally cut off from the fixed die plate (1) due to the presence of the heat insulating material (11b).
(1) There is no heat deprived. Meanwhile, fixed mold (2)
Since heat is supplied to the mold sleeve (4) by heat conduction, the mold sleeve (4) is maintained at substantially the mold temperature, and the molten metal (10)
There is almost no concern about temperature drop. Incidentally, the inner diameter of the mold sleeve (4) may be increased in order to further shorten the injection stroke (L).

When the supply of the molten metal (10) is completed, the piston (6)
Is extruded and the molten metal (10) in the mold sleeve (4) is injected into the mold cavity (9). Injected molten metal (10)
Is atomized with the air in the mold sleeve (4) and filled into the mold cavity (9), but the air entering the mold cavity (9) together with the molten metal (10) is It is released to the outside from 2a) and hardly remains in the product.

At this time, as described above, since the length (L) of the hot water supply portion of the mold sleeve (4) is very short as compared with the conventional example,
The injection stroke can be shortened, and injection filling can be completed in a shorter time than before. In other words, the viscosity of the molten metal (10) is kept low because there is almost no temperature drop, and injection can be performed with the molten metal temperature kept at the mold temperature at a much higher pressure than in the past. Mold cavity with thin wall (9)
The molten metal (10) can be pushed inside. After injection filling, the pressure is increased to obtain a riser effect, and the piston (6) cools it while applying further high pressure to the filling metal.The mold is cooled where the filling metal in the mold cavity (9) solidifies. Open, then return the piston (6) to the retreat limit and remove the die cast product from the mold cavity (9). As a result of synergistic effects of the present embodiment described above, mass production with novel materials such as ultra-thin die-cast products and Mg, which could not be achieved conventionally, has become possible.

In the second embodiment, as shown in FIG. 5, the outer flange (14) of the mold sleeve (4) is attached to the mounting concave step (15a) recessed on the back surface of the fixed mold (2). In this example, the die plate side end (4b) is fitted into the communication hole (3b) of the fixed die plate (1) via a heat insulating material (11b). In this case, the positioning of the fixed mold (2) is performed by, for example, positioning protrusions (1) protruding from the mold mounting surface (1a) of the fixed die plate (1).
Positioning recess (2b) formed on the back of fixed mold (2) in b)
(And vice versa) and fixed with a fastener (not shown). Since the operation in this case is the same as that of the first embodiment, the description is omitted to avoid complication.

FIG. 6 shows a modified example of FIG. 5 in which the outer flange (14) of the mold sleeve (4) is attached to the mounting recessed step (15a) recessed on the back surface of the fixed mold (2). This is an example in which it is fitted and bolted, and the die plate side end (4b) is inserted into the communication hole (3b) of the fixed die plate (1) with a gap (11a) provided. Gap (11
a) also acts as a kind of heat insulation layer (11),
The description is omitted in the same way as in the embodiment, in order to avoid complication.

FIG. 7 shows a modified example of FIG. 6, in which the mold sleeve (4) is fitted into the fixed mold (2) and completely separated from the fixed die plate (1) as described above. In this case, the operation is the same as that of the second embodiment, and a description thereof will be omitted to avoid complication.

In addition, a heat insulating material (11c) may be provided between the fixed mold (2) and the fixed die plate (1) in FIGS. The edge of the fixed die plate (1) is thermally cut off so that heat is not conducted, and the temperature of the fixed mold (2) and the mold sleeve (4) is maintained at a predetermined temperature.

[0026]

According to the present invention, since the mold sleeve is fixed only to the mold side and the edge is cut off by the fixed die plate side and the heat insulating layer, the fixed die plate is conventionally taken away by heat conduction. Heat is no longer taken away, while heat is transmitted from the mold side, so that the mold sleeve is kept at almost the mold temperature, and the temperature of the molten metal supplied to the mold sleeve decreases. Is prevented. Then, the molten metal that has been die-cast in this state enters a very narrow cavity space, which can contribute to the realization of a thinner wall.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of a mold sleeve portion of a die casting machine according to the present invention.

FIG. 2 is a sectional view of FIG. 1 at the time of injection filling;

FIG. 3 is a plan sectional view of FIG. 1;

FIG. 4 is a sectional view of the mold sleeve side of FIG. 1;

FIG. 5 is a sectional view of a second embodiment of a mold sleeve portion of the die casting machine according to the present invention.

FIG. 6 is a sectional view of a modification of FIG. 5;

FIG. 7 is a sectional view of a further modification of FIG. 5;

FIG. 8 is a sectional view of a conventional example.

FIG. 9 is a sectional view of a mold sleeve portion of a conventional example.

[Explanation of symbols]

 (1) Fixed die plate (2) Mold (3) Communication hole (4) Mold sleeve (5) Hot water supply port (6) Piston (7) Space for hot water supply means insertion (11) Heat insulation layer

Claims (5)

[Claims] 1. A die casting machine which is disposed in a communication hole formed in communication with a fixed die plate and a fixed mold and in which a piston is reciprocally inserted into a mold sleeve. A die casting machine characterized in that a fixed die plate is fixed in contact with a fixed die, and an end of the die sleeve side of the die sleeve is separated from the fixed die plate via a heat insulating layer. 2. A die casting machine which is disposed in a communication hole formed in communication with a fixed die plate and a fixed die and in which a piston is reciprocally inserted into the die sleeve. Is disposed in contact with the fixed die, and the end of the die sleeve on the fixed die plate side is disposed in the fixed die plate via a heat insulating layer. 3. A die casting machine, wherein the heat insulating layer according to claim 1 is a gap provided between a mold sleeve and a fixed die plate. 4. A die casting machine, wherein the heat insulating layer according to claim 1 is formed of a heat insulating material provided between a mold sleeve and a fixed die plate. 5. The die casting machine according to claim 1, wherein the fixed die plate and the fixed mold are insulated by a heat insulating material.