JP2002144015A - Die casting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a drastic die casting apparatus with which a small size thin die casting product can be produced. SOLUTION: The die casting apparatus is peculiarly constituted of a die casting machine (B) having a die (1) for die casting and a die sleeve (26) incorporated in an engraving portion (19) formed in a fixed plate (20) fitted to a fixed die (1a) in the die (1) for die casting and arranging a molten metal receiving sprue (28) in the above engraving portion (19), and a melting furnace (2) having a crucible (40) for holding the molten metal, disposed so as to be approachable/ separatable to the die casting machine (B), a molten metal supplying pump (17) disposed in the crucible (40) and a runner tube (3) connected with a spouting hole (49b) of the molten metal supplying pump (17) at the one end (60) and connected so as to be able to position with the molten metal receiving sprue (28) of the die sleeve (26) in the die (1) for die casting at the other end (64) so as to supply the molten metal (5).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die-casting apparatus most suitable for producing ultra-small and ultra-thin die-cast products.

[0002]

2. Description of the Related Art Die-cast products have been widely used for various machine parts because metal products having complicated shapes can be mass-produced. In recent years, due to its excellent moldability, its application to small and thin die-casting products such as "mobile phone frames" and "digital camera bodies" has become active, and conventional die-casting equipment has become incompatible. Recently, there has been a demand for a die casting apparatus capable of handling small and thin die-cast products.

[0003] In addition to the high performance of products, the progress of price reductions of products due to recent globalization is putting pressure on labor cost reduction, which is putting on companies. With the depletion of skilled workers or the increase of unskilled foreign workers, there is a strong demand for ease of use and control of the equipment, and the cost performance of the entire die casting apparatus has been given more importance.

[0004]

It is an object of the present invention to develop an epoch-making die casting apparatus capable of coping with such a situation.

[0005]

According to a first aspect of the present invention, there is provided a die casting apparatus comprising: a die casting die (1); a die casting die (1);
It is housed in a dug portion (19) formed in a fixed die plate (20) for attaching the fixed die (1a) of (1), and a hot water port (28) is provided in the dug portion (19). Mold sleeve (26)
Die casting machine (B) having
A crucible (40) that can be placed close to and separated from (B) to hold the molten metal
And a hot water supply pump (17) installed in the crucible (40), and one end (60) thereof is connected to a pump discharge port (49b) of the hot water supply pump (17), and the other end (64) is a die casting mold ( 1) Mold sleeve (26)
And is connected to the receiving port (28) of the
And a melting furnace (2) having a runner tube (3) adapted to supply (5). "

A second aspect of the present invention is a die casting apparatus (A) which is one step further from the die casting apparatus (A) of the first aspect. The product take-out machine (T) for taking out the die-cast product (D) from is mounted on the die-cast machine (B). "

A third aspect of the present invention is a material metal supply apparatus for supplying a cold die cast metal (18) to a melting furnace (2) according to the number of product shots of a die casting machine (B). (F) is mounted on the melting furnace (2). "

[0008] Claim 4 relates to the control of the die casting apparatus (A) of Claim 1, wherein "the overall control of the die casting apparatus (A) is performed by the overall control unit (S) of the die casting machine (B). It is characterized by being aggregated.

According to this, the mold sleeve (26) is housed in the dug portion (19) formed in the fixed die plate (20), and the hot water port (28) is provided in the dug portion (19). Since it is provided, the mold sleeve of the conventional die casting machine (B ')
The length of the sleeve (L) can be greatly reduced compared to (26 '), and as described later, a high sleeve filling rate and high-speed injection can be achieved, and the flow of the molten metal (5) in the cavity becomes faster. As a result, the shortage of hot water can be resolved even with ultra-thin product (D).

As shown in FIG. 6, a mold sleeve (26 ') of a conventional die casting machine (B') has a nozzle portion (6 ') for supplying a molten metal (5') having a fixed die plate. (20 ') could not be inserted inside, so mold sleeve (26')
Is backward (L1 ') from the rear end (20a') of the fixed die plate (20 ')
And the molten metal (5 ′) was supplied from a hot water port (28 ′) formed in the protruding portion (L1 ′). Therefore, the mold sleeve (26 ') of the conventional die casting machine (B') is inevitably
Is longer than the sleeve length (L) of the present invention, and the molten metal depth (p ′) is smaller than the molten metal depth (P) of the present invention. Therefore, the sleeve filling rate of the conventional example is lower,
High-speed injection becomes impossible. Therefore, it becomes impossible to manufacture ultra-thin and small die-cast products.

Also, a melting furnace (2) and a hot water supply pump (17) disposed in the furnace, a runner pipe (3) for connecting the hot water supply pump (17) and the die casting mold (1), The equipment attached to the die casting machine (B), such as the raw metal supply device (F) attached to the melting furnace (2) and the product unloader (T) attached to the die casting machine (B), is the overall control unit of the die casting machine (B). Since the control is performed in a unified manner in (S), even the unskilled person can easily manage the present apparatus (A).

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. The die-casting apparatus (A) of the present invention is generally installed in a die-casting machine (B), a melting furnace (2) for melting a raw material metal and holding at a predetermined hot water temperature and a melting furnace (2).
Hot water supply pump (17) for feeding (5) and molten metal from melting furnace (2)
(5) Die casting hot water supply device (C) consisting of runner pipe (3) supplying die to die casting mold (1), and die casting metal ingot (18) supplied in ingot form to melting furnace (2) Transfer equipment
(F), a product take-out machine (T) for taking out the die-cast product (D) from the die-casting machine (B), and a conveyor (H) for transferring the taken-out die-cast product (D).

First, the outline of the die casting machine (B) will be described. A movable die plate (22) is reciprocally disposed on a tie bar (21) installed between a fixed die plate (20) and a tailstock (not shown).
(20) and the fixed die (1
a), the movable mold (1b) is mounted so that the mold can be opened and clamped. The fixed mold (1a) and the movable mold (1b) are provided with temperature sensors (23) and (24) and a mold heater (25), and adjust the temperature of the die casting mold (1). ing.

A mold sleeve (26) is provided from the fixed die plate (20) to the fixed mold (1a) and the movable mold (1b), and an injection piston (27) is reciprocally inserted. I have. On the upper surface of the mold sleeve (26), a hot water port (28) is opened. Further, the mold sleeve (26) is provided with a mold sleeve heater (29) and a temperature sensor (not shown) to control the temperature of the mold sleeve (26). A cooling pipe (30) is also provided on the mold sleeve (26).

The mold sleeve (26) is a fixed die plate.
It is housed in the dug portion (19) formed in (20), and the hot water port (28) is located in the dug portion (19). Therefore, as described above, the overall length (L) of the mold sleeve (26) is significantly shorter than that of the conventional mold sleeve (26 '). Therefore, the height (P) of the molten metal (5) filled from the bottom of the mold sleeve (26) is significantly larger in the mold sleeve (26) according to the present invention, and the sleeve filling rate is higher. Become. Therefore,
The exposed surface area per unit area of the molten metal (5) in the mold sleeve (26) is significantly smaller than in the conventional example, and oxidation of the molten metal (5) in the mold sleeve (26) is reduced. You. Moreover, since the length (L) of the mold sleeve (26) becomes shorter, if the forward speed of the injection piston (26) is the same, the injection is completed in a shorter time, so that the injection speed becomes higher. In addition, the flow speed of the molten metal in the cavity can be increased.

The total length (L) of the mold sleeve (26) is
It refers to the length from the back end of the mold sleeve (26) to the tip of the injection piston (27) located at the retreat limit. Of course, the present invention is not limited to this. The tip of the working piston (27) is set to be inside the end of the dug portion (19).

Also, the fixed die (1a) and the fixed die plate (2
0), a heat insulating layer (36) made of a heat insulating material is disposed to suppress heat conduction from the fixed mold (1a) to the fixed die plate (20), thereby reducing the inside of the cavity. The molten metal (5) injected and filled into the mold is prevented from being quickly taken away by the fixed mold (1a) and solidified. By doing so, it is possible to sufficiently supply hot water to the extremely narrow gap of the cavity forming the ultra-thin portion, and to cope with the thinning of the die-cast product (D) from the mold side.

Excavated part (19) of fixed die plate (20)
Not only the mold sleeve (26), but also the nozzle part (6) provided at the tip of the runner pipe (3) described later is formed in a size and shape that can be inserted into the fixed die plate (20). ing.

The melting furnace (2) is arranged to be reciprocally movable on rails (31) by wheels (35). The reciprocating movement of the melting furnace (2) is performed by rotating the moving handle (32) installed in the melting furnace (2) so as to mesh with the rail-shaped gear (33) arranged in parallel with the rail (31). The rotation is performed by rotating and stopping the rotating gear (34). The stop is performed by a brake device (not shown).
Do with.

In the melting furnace (2), a crucible (4) for holding a molten metal (5) is provided.
0) is formed, and a mounting base (42) is erected on the ceiling (41) of the crucible (40), and the mounting base (42) is for driving a hot water supply piston (57). Hot water supply cylinder (43) and rotary actuator (45) for driving switching valve (44)
And are attached. The hot water supply cylinder (43) is connected to a piston rod (57a) of the hot water supply piston (57) via a coupling (46). A hot water supply pump (17) for hot water supply is installed in the crucible (40), and the hot water supply piston
The (57) is inserted into a pump cylinder (48) installed on the ceiling (41) of the hot water supply pump (17).

A pump outlet (49a) provided at an end of a pump body (47) of the hot water supply pump (17) has a runner pipe (3) to be described later.
Connection end (60) of the pump cylinder (48)
Is in communication with A switching valve (44) for opening and closing the communication hole (49) is provided in a communication hole (49) between the connection end (60) of the runner pipe (3) and the pump cylinder portion (48), It is connected to the rotary actuator (45). The supply of the molten metal (5) to the pump cylinder part (48) is performed when the hot water supply piston (57) moves from the bottom dead center (lowest position) to the top dead center (top position). This is performed by sucking the molten metal (5) from the molten metal suction port (44a) of (44). When the communication hole (49) is closed, the molten metal suction port (44a) is connected to the communication hole (49a) on the pump cylinder (48) side and the crucible (40).
And the pump cylinder (4) of the molten metal (5) in the crucible (40)
8) Enable suction inside.

Further, the raw metal cold lump (18) such as an ingot is formed through a charging door (53) of a material charging section (52) provided on a ceiling (41). In addition, a partition plate that partitions the crucible (40) over substantially the entire width is provided on the ceiling (41) of the material charging section (52).
(54) is arranged so that it can be suspended and lifted up, and the crucible (40)
Is divided into a portion immediately below the material charging section (52) and a hot water supply side so that scum (not shown) generated in a portion immediately below the material charging section (52) does not flow into the hot water supply side. The temperature of the hot water in the crucible (40) is constantly monitored by the crucible thermometer (55). Further, a burner (not shown) is installed in the melting furnace (2) to melt the cold metal ingot (18) and maintain the hot water temperature. The inside of the melting furnace (2) is filled with an antioxidant gas (for example, a mixed gas of hexafluoride), and supplied from a gas supply pipe (56) provided in a ceiling (41).

The runner pipe (3) is composed of a die casting mold (1) and a melting furnace.
(2) and die (5) of the melting furnace (2)
For supplying to (1), for example, a stainless steel melt pipe (61) is inserted in the center, a heater (4) is wound around the pipe, and a heat insulating member (62) is further wound therearound. ing. The molten metal immersion side end of the molten metal pipe (61) has a convex hemispherical connection end.
(60) and the pump outlet (4
It is pressed and fitted into the concave hemispherical pivot seat (63) provided in 9b). The other end of the molten metal pipe (61) is a runner pipe (3)
Hot water supply nozzle (64) inserted through the nozzle (6) at the tip of
It is connected to the.

The runner pipe (3) is composed of a die casting mold (1) and a melting furnace.
(2) and die (5) of the melting furnace (2)
Since it is for supplying to (1), its shape is not particularly limited, but the vertical part (63) that passes through the ceiling part (41) of the melting furnace (2) and reaches the pivot seat (63) ( 65), vertical part (65)
The horizontal part (66) extending horizontally from the upper end of the horizontal part (66), the sloping part (67) extending diagonally upward from the tip of the horizontal part (66), and extending slightly downward from the sloping part (67) to the hot water supply nozzle (64) And a connection portion (68) for connection to the power supply.

The heater (4) of the runner pipe (3) is divided into three zones. As the first zone, a part of the sloping part (67) and a part of the horizontal part (66) following the skew part (67), that is, a range shown by (7) in FIG. 9 (this part is referred to as a hot water storage part (7)), Of the subsequent horizontal part (66) and most of the vertical part (65), the range reaching the melting furnace (2) (this part is called the intermediate part (13)) and the ceiling part of the melting furnace (2) ( 41) is divided into the lower part (this part is called the hot water suction part (12)),
Each zone (7) (12) (13) has a heater for hot water storage
(8), middle section heater section (15) and hot water section heater section (14)
In addition, temperature sensors (69), (70), and (71) are provided, and the temperature is independently controlled. Hot water storage
The size of (7) is 1-2 of the casting weight of the die-cast product (1)
(For example, when the weight of the die-cast product (D) is 100 to 150 g, the amount of hot water in the hot water storage section (7) is in the range of about 180 to 200 g).

The nozzle part (6) is a hot water supply nozzle (6) connected to a connection part (68) of the molten metal conduit (61) at the tip of the runner pipe (3).
4) penetrates obliquely, and a gas pipe (72) for supplying an inert gas such as nitrogen gas is connected to an upper end thereof. In addition, the nozzle section (6) is used alone for the nozzle section heater (1
1) and a temperature sensor (73) are provided.

The vertical part (65) of the molten metal conduit (61) is simply a ceiling part (4).
Since it is only inserted from 1) into the melting furnace (2) and pressed by its own weight on the pivot seat (63) and the connection end (60) rotates only thereabout, the molten metal conduit A support arm (16) for supporting (61) is installed on the ceiling (41). The support arm (16) has a support shaft (80) erected on the ceiling (41), one end of which is rotatably connected to the support shaft (80), and the other end supporting the support arm (16). Rotating arm (81)
It is composed of

In the melting furnace (2), the raw material supply device (F) attached to the melting furnace (2) stocks the die casting metal (18) supplied by the ingot and mounts it on the die casting machine (B). The die casting metal (18) is automatically supplied to the melting furnace (2) sequentially by the transfer conveyor (85) according to the command (the number of shots and / or the level of the molten metal level described later) from the overall control unit (S). It has become.

The die-casting machine (B) is provided with a product take-out machine (T) as required, so that the die-casting product (D) can be taken out from the die-casting machine (B) whose mold has been opened. I have. The removal method is generally a method in which a biscuit of a cooled and solidified die-cast product (D) is sandwiched and removed from the cavity. Further, a transfer device (H) is provided beside the product take-out machine (T), and the taken-out die-cast product (D) is sent out. In the transfer device (H), for example, a detection device for a die-cast product (D) is installed, and when the die-cast product (D) is sent to the transfer device (H), it is detected and operated. .
On the other hand, the product unloading machine (T) operates based on a command from the die casting machine (B).

As described above, the control of the die casting apparatus (A) is performed by the local controller (S1) of the die casting machine (B) in the present invention.
In 1), the control of the attached series of equipment is integrated and the overall control
As (S), the whole is controlled uniformly. That is, the charging of the die-cast metal (18) into the crucible (40) from the raw material supply device (F) installed as needed is performed by the melting furnace (2).
The number of shots is controlled, and when the set number of shots is reached, the die casting metal (18) is charged. At the same time, the molten metal level is also detected by the molten metal level detector (not shown), and when the molten metal level falls below the set height, the injection of the die casting metal (18) will be commanded. However, if there is a large discrepancy between the number of shots and the level difference, the alarm
(“Melting furnace abnormality” described later) will be issued.

The melting furnace (2) is provided with a hot water supply pump (17) and a runner pipe (3) connected thereto. The hot water supply piston (57) of the hot water supply pump (17) is operated. Switching valve (44) that opens and closes the hot water supply cylinder (43) and communication hole (49)
The hot water supply / suction operation of the rotary actuator (45) is also performed according to a command from the overall control unit (S).

Briefly describing the suction operation, when the switching valve (44) is rotated to close the communication hole (49),
The inside of the crucible (40) communicates with the communication hole (49a) on the pump cylinder (48) side.
(43) is operated to move the hot water supply piston (57) from bottom dead center (lowest position) to top dead center (top position).
The molten metal (5) in (40) is sucked into the pump cylinder (48).

The hot water supply operation is the reverse of the above. The switching valve (44) is reversed, and the hot water supply cylinder (43) is operated while the communication hole (49) is open, thereby causing the hot water supply piston (57) to die. When moving from the point (top position) to the bottom dead center (bottom position), the molten metal (5) in the pump cylinder (48) is pushed out to the communication hole (49) and passes through the runner pipe (3). It is supplied to the die casting mold (1). In addition, heater divided into three zones of runner pipe (3)
(4) The heater (11) of the nozzle section (6), etc. are also independently controlled by the overall control section.
The temperature is controlled by (S).

In addition, the overall control unit (S) of the die casting machine (B) includes a reciprocating operation and a reciprocating speed of the movable die plate (22) of the die casting die (1), a fixed die (1a) and a movable die ( Analysis of input data of the temperature sensors (23) and (24) of 1b), temperature control of the mold heaters (25) and (29) based on the data, injection piston (27)
And the operation timing of the take-out device (T) and the transfer device (H), as well as the control of all the die-casting machines (B) and their associated equipment.

The overall control unit (S) mounted on the die casting machine (B) has a display device (G) and an input device (N) having a numeric keypad. The input and correction of the set values, the display of various work states, and the like are uniformly performed through these.

[0036]

According to the present invention, there are provided a melting furnace and a hot water supply pump, a runner pipe, and, if necessary, an auxiliary equipment of a die casting machine such as a raw metal supply device and a product take-out machine attached to the melting furnace. Since the overall control unit of the die casting machine is controlled in a unified manner, even an unskilled person can easily manage the apparatus. Furthermore, since the sleeve length of the mold sleeve of the present apparatus is significantly shorter than in the past, a high sleeve filling rate and high-speed injection can be achieved, and an ultra-thin product can be manufactured.

[Brief description of the drawings]

FIG. 1 is a schematic front view of the apparatus of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a sectional view showing a state in which hot water supply to a mold sleeve of the apparatus of the present invention is completed.

FIG. 4 is a plan view showing a rotating state of a runner pipe of the apparatus of the present invention.

FIG. 5 is an enlarged sectional view of a runner tube portion of the apparatus of the present invention.

FIG. 6 is an enlarged sectional view of a conventional mold sleeve portion.

[Explanation of symbols]

 (1) Die casting mold (2) Melting furnace (3) Runner pipe (4) Heater (5) Molten metal (6) Nozzle part (7) Hot water storage part (8) Heater part for hot water storage part (13) Middle part (14 ) Hot water heater (15) Middle heater

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B22D 37/00 B22D 37/00 Z

Claims (4)

[Claims] (A) A die casting die and a fixed die plate for mounting a fixed die of the die casting die are housed in a dug portion formed in the die die, and a hot water inlet is provided in the dug portion. A die casting machine having a mold sleeve; and (b) a crucible for holding molten metal, which is installed so as to be able to approach and separate from the die casting machine, and a hot water supply pump installed in the crucible,
A runner pipe having one end connected to the pump discharge port of the hot water supply pump and the other end connected to the hot end port of the die sleeve of the die casting mold so as to be aligned with and capable of supplying molten metal; A die casting apparatus characterized by comprising a melting furnace. 2. The die casting machine according to claim 1, wherein the die casting machine is provided with a product take-out machine that interlocks with the die casting machine and takes out the die cast product from the die casting mold when the mold is opened. 3. The die casting apparatus according to claim 1, wherein a raw metal supply apparatus for supplying a die casting metal ingot to the melting furnace according to the number of product shots of the die casting machine is provided in the melting furnace. 4. The die casting apparatus according to claim 1, wherein control of the entire die casting apparatus is centralized in an overall control unit of the die casting machine.