JP3899228B2 - Die casting equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a die casting apparatus that is optimal for the manufacture of ultra-small and ultra-thin die-cast products.
[0002]
[Prior art]
Die-cast products have been widely used for various machine parts because they can mass-produce metal products with complex shapes. In recent years, because of its excellent formability, it has been actively applied to small thin die-cast products such as “mobile phone frames” and “digital camera bodies”, and it cannot be used with conventional die casting equipment. Recently, there has been a demand for a die casting apparatus that can handle a small thin die casting product.
[0003]
In addition to the high performance of products, the recent progress in product price reduction due to globalization has been a pressing force on companies, which has been a pressure to reduce labor costs. The demand for ease of use and manageability of equipment due to depletion or an increase in the number of unskilled foreign workers has been put out strongly, and the cost performance of the entire die casting equipment has been more emphasized.
[0004]
[Problems to be solved by the invention]
The development of an innovative die casting apparatus capable of coping with such a situation is a problem to be solved by the present invention.
[0005]
[Means for Solving the Problems]
The die-casting device (A) of “claim 1” has “(a) a die-casting die (1) having a moving die (1b) and a fixed die (1a) and the moving die (1b) attached thereto. A movable die plate (22) and a digging portion (19), the fixed die plate (20) to which the fixed mold (1a) is attached, and the digging portion (19) are housed in the digging A die casting machine (B) having a mold sleeve (26) provided with a hot water inlet (28) in a portion (19) , (b) a melting furnace for melting a raw metal and holding it at a predetermined hot water temperature ( and 2) is installed in the furnace (2) within the melting furnace and (2) of the molten metal (5) hot water supply pump for feeding the (17), between the hot water supply pump (17) and the mold sleeve (26) Die-casting hot water supply device (C) consisting of the arranged runner pipe (3) , (c) stocking the die-cast metal (18) supplied by the ingot, and transferring the die-cast metal (18) to the conveyor (85) Sequentially, the melting furnace (2) Raw material metal feeder for feeding (F), and linked in (d) of the die casting machine (B), the die-casting die during mold opening (1) taking out the die casting product (D) from the product take-out machine and a (T) A die casting apparatus for supplying molten metal in a melting furnace (2) from a hot water supply pump (17) to a die casting mold (1) through a runner pipe (3) and a mold sleeve (26) , the raw material introduction of die-cast metal (18) from the metal delivery system (F) is managed by the product number of shots, the number of products shot reaches the number of shots on of die-cast metal (18) is performed, at the same time molten metal surface The height is also detected by the molten metal level detecting device, and when the molten metal level falls below the set height, the injection of the die-cast metal (18) is commanded ”.
[0007]
“Claim 2 ” is a step further than this. “The control of a series of devices attached to the die casting machine (B) such as the raw metal supply device (F) and the product take-out machine (T) is integrated. The entire die casting machine (B) is controlled in a unified manner ”.
[0009]
According to this, the mold sleeve (26) is stored in the digging portion (19) formed in the fixed die plate (20), and the hot water inlet (28) is provided in the digging portion (19). Therefore, the sleeve length (L) can be significantly shortened compared to the mold sleeve (26 ') of the conventional die casting machine (B'), and high sleeve filling rate and high speed injection are possible as will be described later. The flow of the molten metal (5) in the cavity becomes faster, and the lack of hot water is solved even in the ultra-thin product (D).
[0010]
As shown in FIG. 6, the die sleeve (26 ′) of the conventional die casting machine (B ′) has a nozzle portion (6 ′) for supplying molten metal (5 ′) having a fixed die plate (20 ′). ) The mold sleeve (26 ′) protrudes backward (L1 ′) from the rear end (20a ′) of the fixed die plate (20 ′) because it could not be inserted into the fixed die plate (20 ′). The molten metal (5 ′) was supplied from the hot water inlet (28 ′) formed in L1 ′). Therefore, the sleeve length (L ′) of the mold sleeve (26 ′) of the conventional die casting machine (B ′) is necessarily longer than the sleeve length (L) of the present invention, and the molten metal depth (p ′) is It becomes shallower than the molten metal depth (P) of the present invention. Therefore, the sleeve filling rate is lower in the conventional example, and high-speed injection becomes impossible. Therefore, it becomes impossible to manufacture ultra-thin and small die-cast products.
[0011]
Also, a melting furnace (2) and a hot water pump (17) disposed in the furnace, a hot water pipe (3) connecting the hot water pump (17) and the die casting mold (1), and a melting furnace as required The equipment attached to the die casting machine (B), such as the raw material metal supply device (F) attached to (2) and the product take-out machine (T) attached to the die casting machine (B), is the overall control part (S) of the die casting machine (B). Therefore, even an unskilled person can easily manage the apparatus (A).
[0012]
DETAILED DESCRIPTION OF THE INVENTION
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) and a melting furnace (2) for melting a raw metal and holding it at a predetermined hot water temperature. ), A die casting hot water supply device (C) comprising a hot water supply pump (17) and a runner pipe (3) for supplying molten metal (5) from the melting furnace (2) to the die casting mold (1), melting furnace (2 ) In which the die-cast metal cold block (18) supplied in ingot form is fed, the product removal machine (T) for taking out the die-cast product (D) from the die-casting machine (B), and the die-casting taken out Consists of a conveyor (H) for transferring the product (D).
[0013]
First, an 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 tail stock (not shown), and moves with the fixed die plate (20). A fixed mold (1a) and a movable mold (1b) are mounted on the mold mounting surface of the die plate (22) 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) to adjust the temperature of the die casting mold (1). ing.
[0014]
A mold sleeve (26) is disposed from the fixed die plate (20) to the fixed mold (1a) and the movable mold (1b), and an injection piston (27) is reciprocally inserted. A hot water inlet (28) is provided on the upper surface of the mold sleeve (26). Further, the mold sleeve (26) is provided with a mold sleeve heater (29) and a temperature sensor (not shown) to adjust the temperature of the mold sleeve (26). The mold sleeve (26) is also provided with a cooling pipe (30).
[0015]
The mold sleeve (26) is housed in a dug portion (19) formed in the fixed die plate (20), and the hot water inlet (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 filled molten metal (5) in the mold sleeve (26) is significantly smaller than that of the conventional example, and the oxidized molten metal (5) in the molded sleeve (26) is oxidized. Is reduced. Moreover, since the length (L) of the mold sleeve (26) is shortened, if the forward speed of the injection piston (26) is the same, the injection is completed in a shorter time, so the injection speed is increased accordingly. The flow rate of hot water in the cavity can be increased.
[0016]
The total length (L) of the mold sleeve (26) refers to the length from the back end of the mold sleeve (26) to the tip of the injection piston (27) located in the retreat limit, and of course this is not the only limit. In this embodiment, the tip of the injection piston (27) positioned at the retreat limit is set so as to be inside the end of the dug portion (19).
[0017]
Also, a heat insulating layer (36) made of a heat insulating material is disposed between the fixed mold (1a) and the fixed die plate (20), and the fixed mold (1a) to the fixed die plate (20). Thus, the molten metal (5) injected and filled in the cavity is prevented from rapidly depriving the fixed mold (1a) of heat and solidifying. By doing so, it was possible to sufficiently supply hot water to the extremely narrow gap of the cavity forming the ultra-thin part, and to cope with the thinning of the die cast product (D) from the mold side.
[0018]
The digging part (19) of the fixed die plate (20) is not only the mold sleeve (26), but also the nozzle part (6) provided at the tip of the runner pipe (3) described later is a fixed die plate ( 20) It is formed in a size and shape that can enter.
[0019]
The melting furnace (2) is disposed on the rail (31) by a wheel (35) so as to be reciprocally movable. The reciprocating movement of the melting furnace (2) meshes with the rail-shaped gear (33) arranged in parallel with the rail (31) by rotating the moving handle (32) installed in the melting furnace (2). This is done by rotating and stopping the rotating gear (34). The stopping is performed by a brake device (not shown).
[0020]
A crucible (40) for holding the molten metal (5) is formed in the melting furnace (2), and a mounting base (42) is erected on the ceiling (41) of the crucible (40), A hot water supply cylinder (43) for driving the hot water supply piston (57) and a rotary actuator (45) for driving the switching valve (44) are attached to the mounting base (42). The hot water supply cylinder (43) is connected to the piston rod (57a) of the hot water supply piston (57) through a coupling (46). In the crucible (40), a hot water supply pump (17) for hot water supply is installed, and the hot water supply piston (57) is a pump cylinder part (on the ceiling part (41) of the hot water pump (17)) ( 48) is inserted.
[0021]
The pump discharge port (49a) provided at the end of the pump body (47) of the hot water supply pump (17) is connected to a connection end (60) of the runner pipe (3) described later, and the pump cylinder ( 48). A switching valve (44) for opening and closing the communication hole (49) is disposed in the communication hole (49) between the connection end (60) of the runner pipe (3) and the pump cylinder part (48). The rotary actuator (45) is connected. The molten metal (5) is supplied to the pump cylinder part (48) when the hot water supply piston (57) moves from the bottom dead center (bottom position) to the top dead center (top position). It is performed by sucking the molten metal (5) from the molten metal inlet (44a) of 44). When the communication hole (49) is closed, the molten metal suction port (44a) communicates with the communication hole (49a) on the pump cylinder (48) side and the crucible (40), and the pump cylinder of the molten metal (5) in the crucible (40). (48) Allows suction into.
[0022]
Further, for example, the raw metal cold agglomerates (18) such as ingots are performed through the charging door (53) of the material charging part (52) provided on the ceiling (41). In addition, a partition plate (54) for partitioning the crucible (40) over substantially the entire width is disposed on the ceiling portion (41) of the material charging section (52) so as to be able to be suspended and flipped up. It is divided into a part immediately below the material charging part (52) and a hot water supply side so that scum (not shown) generated in the part immediately below the material charging part (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). In addition, a burner (not shown) is installed in the melting furnace (2) to melt the input raw material metal cold block (18), maintain the hot water temperature, and the like. The melting furnace (2) is filled with an antioxidant gas (eg, hexafluoride mixed gas), and is supplied from a gas supply pipe (56) provided in the ceiling (41).
[0023]
The runner pipe (3) connects the die casting mold (1) and the melting furnace (2) and supplies the molten metal (5) of the melting furnace (2) to the die casting mold (1). For example, a molten metal conduit (61) made of stainless steel is inserted, and a heater (4) is wound around it, and a heat insulating member (62) is wound around the heater (4). The molten metal immersion side end of the molten metal conduit (61) has a convex hemispherical connection end (60), and a concave hemispherical pivot seat (63) provided at the pump discharge port (49b) of the pump body (47). ). The other end of the molten metal conduit (61) is connected to a hot water supply nozzle (64) inserted through the nozzle portion (6) at the tip of the runner pipe (3).
[0024]
The runner pipe (3) is for connecting the die casting mold (1) and the melting furnace (2) to supply the molten metal (5) of the melting furnace (2) to the die casting mold (1). The shape is not particularly limited, but it extends horizontally from the upper end of the vertical portion (65), which reaches the pivot seat (63) through the ceiling (41) of the melting furnace (2). The horizontal part (66) extending to the slope, the skewed part (67) extending obliquely upward from the tip of the horizontal part (66), and extending slightly downward from the skewed part (67) and connected to the hot water supply nozzle (64) Part (68).
[0025]
The heater (4) of the runner pipe (3) is divided into three zones. As the first zone, a skewed portion (67) and a part of the horizontal portion (66) subsequent thereto, that is, a range indicated by (7) in FIG. 9 (this portion is referred to as a hot water storage portion (7)) Of the horizontal part (66) and the vertical part (65) that follow it, the range to the melting furnace (2) (this part is referred to as the intermediate part (13)) and the ceiling part of the melting furnace (2) ( 41) is divided into lower parts (this part is referred to as a hot-water absorption part (12)), and in each zone (7), (12) and (13), a heater part for hot water storage part (8) and a heater for intermediate part The heater part (15), the hot water suction part (14), and the temperature sensors (69), (70), (71) are provided, and the temperature is controlled independently of each other. The size of the hot water storage section (7) is 1 to 2 times 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 hot water volume of the hot water storage section (7) is 180 to 200 g. Degree range).
[0026]
The nozzle part (6) is the tip of the runner pipe (3), and the hot water supply nozzle (64) connected to the connection part (68) of the molten metal conduit (61) penetrates diagonally, A gas pipe (72) for supplying an inert gas such as nitrogen gas is connected. The nozzle section (6) is independently provided with a nozzle section heater (11) and a temperature sensor (73).
[0027]
The vertical portion (65) of the molten metal conduit (61) is simply inserted into the melting furnace (2) from the ceiling portion (41), pressed against the pivot seat (63) by its own weight, and the connection end (60 ) Is only rotated, a support arm (16) for supporting the molten metal conduit (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 attached to the support shaft (80), and the other end that supports the support arm (16). And a rotating arm part (81).
[0028]
In the melting furnace (2), the raw material supply device (F) attached to the melting furnace (2) stocks the die-cast metal (18) supplied by the ingot and is mounted on the die-casting machine (B). Die-cast metal (18) is automatically supplied to the melting furnace (2) sequentially by the transfer conveyor (85) according to a command from the overall control unit (S) (number of shots and / or molten metal height described later). ing.
[0029]
The die casting machine (B) is provided with a product take-out machine (T) as necessary, and the die-cast product (D) is taken out from the die-casting machine (B) that has been opened. In general, the take-out method is a method in which a biscuit of the die-cast product (D) that has been cooled and solidified is sandwiched and taken out from the cavity. Further, a transfer device (H) is installed beside the product take-out machine (T), and the taken-out die cast product (D) is sent out. For example, a detection device for a die-cast product (D) is installed in the transport device (H), and when the die-cast product (D) is sent to the transport device (H), this is detected and activated. . On the other hand, the product take-out machine (T) is operated based on a command from the die casting machine (B).
[0030]
As described above, in the control of the die casting apparatus (A), in the present invention, the control of the attached series of apparatuses is integrated into the local control section (S11) of the die casting machine (B), and the entire control section (S) is controlled as a whole. Control is unified. That is, the introduction of the die-cast metal (18) into the crucible (40) from the raw material supply device (F) installed as needed is controlled by the number of product shots , and when the set number of shots is reached, the die-cast metal (18) is input. At the same time, the molten metal surface height is also detected by a molten metal surface height detection device (not shown), and when the molten metal surface height falls below the set height , the injection of die casting metal (18) will be commanded. However, if there is a large discrepancy between the number of shots and the molten metal surface height, an alarm (such as “melting furnace abnormality” to be described later) such as a molten metal leak will be issued.
[0031]
The melting furnace (2) has a hot water supply pump (17) and a runner pipe (3) connected to the hot water supply pump (17). Hot water supply / suction operation of the switching valve (44) and the rotary actuator (45) for opening and closing the cylinder (43) and the communication hole (49) is also performed according to a command from the overall control unit (S).
[0032]
Briefly describing the suction operation, when the switching valve (44) is rotated to close the communication hole (49), the inside of the crucible (40) and the communication hole (49a) on the pump cylinder (48) side are separated. When the hot water supply cylinder (43) is operated in this state and the hot water supply piston (57) is moved from the bottom dead center (bottom position) to the top dead center (top position) Then, the molten metal (5) in the crucible (40) is sucked into the pump cylinder (48).
[0033]
The hot water supply operation is the opposite: the switching valve (44) is reversed, the hot water supply cylinder (43) is operated with the communication hole (49) open, and the hot water supply piston (57) is at the top dead center (maximum dead center). When moved from the upper 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) to die cast die. Supplied to (1). In addition, the heater (4) divided into the three zones of the runner pipe (3), the heater (11) of the nozzle part (6), etc., are independently temperature controlled by the overall control part (S). Yes.
[0034]
In addition, the overall control unit (S) of the die casting machine (B) is used for the reciprocating operation and the reciprocating speed of the moving die plate (22) of the die casting die (1), the fixed die (1a) and the moving die (1b). Analysis of input data of temperature sensors (23) and (24), temperature adjustment of mold heaters (25) and (29) based on the data, injection speed and operation timing of injection piston (27), take-out device as described above (T) and control of the operation timing of the transfer device (H) and other controls related to all die casting machines (B) and their associated equipment.
[0035]
In addition, 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, and is set to the overall control unit (S). Input, correction, and display of various work states are performed uniformly through these.
[0036]
【The invention's effect】
In the present invention, a die casting machine attached equipment such as a melting furnace, a hot water supply pump disposed in the furnace, a runner pipe, and a raw material metal supply device attached to the melting furnace and a product take-out machine are controlled as a whole. Since this is controlled uniformly by the unit, 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 the conventional one, a high sleeve filling rate and high-speed injection are possible, making it possible to manufacture ultra-thin products.
[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 cross-sectional view of a hot water supply to a mold sleeve of the apparatus of the present invention. FIG. 5 is an enlarged sectional view of a runner pipe portion of the apparatus of the present invention. FIG. 6 is an enlarged sectional view of a conventional mold sleeve portion.
(1) Die casting mold
(2) Melting furnace
(3) Yudo pipe
(4) Heater
(5) Molten metal
(6) Nozzle part
(7) Hot water storage
(8) Heater for hot water storage
(13) Intermediate part
(14) Hot water heater part
(15) Intermediate heater

Claims (2)

(a) a die casting mold having a moving mold and a fixed mold, a moving die plate to which the moving mold is attached, a fixed die plate having a digging portion to which the fixed mold is attached , and the digging A die-casting machine having a mold sleeve housed in a sunk portion and provided with a hot water inlet in the digging portion ; (b) a melting furnace for melting a raw metal and holding it at a predetermined hot water temperature; and a melting furnace is installed within a hot water supply pump for feeding the molten metal in the melting furnace, die casting water heater consisting of arranged with a runner between the hot water supply pump and the mold sleeve, a die-cast metal supplied in (c) ingot stock, and die-the die-cast metal sequentially by the transport conveyor, the automatic supplying raw material metal feeder to the melting furnace, and interlocked in (d) of the die casting machine, from the die-casting die during the mold opening And a product take-out machine to take out the bets products, the molten metal melting furnace to a die casting apparatus for supplying a die-casting die via a runner and a mold sleeve from the hot water supply pump,
The casting of the die-cast metal from the raw metal supply device is controlled by the number of product shots. When the number of product shots reaches the set number of shots, the casting of the die-cast metal is performed, and at the same time, the molten metal surface height is detected. A die casting apparatus characterized in that when a molten metal level is detected by the apparatus and the molten metal surface level is equal to or lower than a set height, the injection of die casting metal is commanded. The control of the raw material metal feeder and product series of devices annexed to the die casting machine of the take-out machine such as aggregate, according to claim 1, characterized in that so as to uniformly control the whole of the die casting machine Die casting device.

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