JP3449287B2 - Semi-molten metal production equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die-casting machine for a semi-molten metal in a solid-liquid coexisting state in which a liquid phase metal in a molten state and a solid phase metal in a solid state are mixed. Injection sleeve is loaded and cast, so-called semi-molten metal production apparatus in the so-called rheocasting method, in particular, a plurality of molten cups are arranged at positions where the upper surface of the rotary table is divided at equal intervals, and the rotary table is provided for each casting shot. While rotating by a certain angle, each work such as pouring, cooling and heating is sequentially performed at each work station, and the target molding temperature range in which the molten metal in the melt cup at the final work station is in a solid-liquid coexisting state. Related to a rotary table type semi-molten metal production system that adjusts the temperature so that it is contained within To temperature adjusted to fall within a temperature range, to a semi-molten metal production apparatus by injecting air so as to cool the molten metal in the molten metal cup on the outer peripheral surface of the molten metal cup by the cooling unit. 2. Description of the Related Art The rheocasting method enables casting with less casting defects and a shorter molding cycle as compared with the conventional casting method. It is indispensable to manage finely and uniformly. In other words, the rheocast casting method is a casting method in which the suitability of the semi-molten metal production equipment has a close effect on the casting performance, and the semi-molten metal production equipment has a spherical shape while uniformly cooling the molten metal poured into the holding container. It is required to stably generate fine crystals close to the above and adjust the solid phase ratio to a predetermined value. For this reason, various semi-molten metal production apparatuses have been studied. For example, Japanese Patent Application Laid-Open No.
While rotating the rotary table by a certain angle for each casting shot, each work of cooling and heating is performed sequentially at each work station, and the target molding where the molten metal in the melt cup at the final work station is in a solid-liquid coexistence state There is disclosed a rotary table type semi-molten metal manufacturing apparatus that adjusts the temperature so as to fall within a temperature range. [0004] In the rotary table type semi-molten metal manufacturing apparatus described above, the molten metal is stored in the molten metal cup by a cooling unit having a fluid ejection hole for injecting air toward the outer peripheral surface of the molten metal cup. The molten metal is cooled, but air is ejected from the fluid ejection hole of the optimal height according to the size of the molten cup, the amount of molten metal stored in the molten cup, and the type of molten alloy, and the inside of the molten metal cup is cooled. It is important to cool the molten metal stored in the furnace as uniformly as possible.
In the conventional rotary table type semi-solid metal production equipment,
The cooling unit was provided with a large number of fluid outlets, and air piping was connected to the fluid outlet of the optimal height selected as appropriate from among them. In addition to spending a great deal of time and effort in the work of attaching and detaching the pipe, the quality of the cast product often deteriorates due to a mistake in the connection of the air piping system. [0005] In order to solve the problems of such a conventional semi-molten metal production apparatus, in the present invention, a liquid phase metal in a molten state and a solid phase metal in a solid state are mixed. A semi-solid metal producing apparatus for producing a semi-solid metal in a solid-liquid coexistence state, and a rotary table for sequentially rotating a plurality of divided work stations by a fixed angle for each casting shot, and an upper surface of the rotary table. A plurality of melt cups arranged at positions to be equally spaced,
A cup lid having an opening concave portion on a lower end surface side capable of closing an upper end portion of the molten metal cup into which the molten metal has been poured by the hot water supply device, and a plurality of ejection holes for ejecting a cooling fluid toward an outer peripheral surface of the molten metal cup. A cooling unit composed of a plurality of nozzle bars extending downward, elevating means capable of elevating the cooling unit, and a cooling fluid supplied to the cooling unit, which can be instantaneously attached and detached. A cooling distribution stand connected to an air supply source via a hose by a detachable joint, and an inner side connected at one end to the cooling distribution stand and the other end located in the same horizontal plane of a plurality of nozzle bars constituting the cooling unit. A plurality of sets of cooling pipes which are branched and connected to a plurality of fluid ejection holes drilled are provided. Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 6 relate to an embodiment of the present invention, FIG. 1 is a plan view of a semi-molten metal production apparatus, FIG. 2 is a front view of the semi-molten metal production apparatus, and FIG. FIG. 4 is a front view of a cooling device during cooling, FIG. 5 is a front view of a cooling air pipe for supplying air to the cooling device, and FIG. -A
FIG. 7 is a plan view of the cooling air pipe as viewed from the arrow side, and FIG. 7 is a plan view of the cooling air pipe as viewed from the arrow bb side in FIG. As shown in FIG. 2, the semi-solid metal production apparatus 100 is roughly divided into eight working stations (A, B, C, D, E, F, G, H in FIG. 1). ) Is sequentially rotated clockwise by ８ rotation for each casting shot, and is horizontally and rotatably provided so as to be able to stop at a predetermined position, and at equal intervals on the rotary table 1. A table unit 80 mainly including the molten metal cup 23 disposed therein, and C, D, and
The cooling device 40 disposed above the table unit 80 over five work stations E, F, and G
And a heating unit 60 disposed at a work station indicated by H in FIG. 1. Each work such as pouring, cooling, and heating is sequentially performed at each work station.
Molten metal cup 23 at the work station indicated by A in FIG.
The temperature is adjusted so that the molten metal in the inside falls within a target molding temperature range where solid-liquid coexistence occurs. First, the detailed configuration of the table unit 80 of the semi-molten metal manufacturing apparatus 100 will be described. As shown in FIG. 2, the table unit 80 has a main frame 7 and a column 8 erected on the floor by foundation bolts.
A base plate 4 is horizontally disposed via a bracket 6, and above the base plate 4, a disk-shaped rotary table 1 rotated and driven by a table rotating device 3.
Are provided horizontally and rotatably. Further, as shown in FIG. 3, a cup-shaped molten metal cup 23 into which molten metal is poured by a hot water supply device (not shown) and the molten metal cup 23 are provided at respective positions where the concentric circle on the upper surface of the rotary table 11 is divided into eight at equal intervals. Cup seat 2 arranged below
A cylindrical cup holder 22 having a notch in its body for disposing the fluid ejected from the cooling device 40 is provided while the inner peripheral surface of the cup 4 is loaded and positioned. Next, the configuration of the cooling device 40 will be described in detail. The cooling device 40 includes C, D, E, F, and G in FIG.
A total of five cooling units (4
0c, 40d, 40e, 40f, and 40g), and each of the cooling units has a cup lid 2 having a concave portion 26a opened on the lower end surface side as shown in FIG.
6 are provided, and three nozzle bars 41 having a number of fluid ejection holes directed inward are provided vertically. An upper frame 9 is mounted horizontally on the upper end surfaces of the main frame 7 and the support columns 8, and a first portion for driving the cooling device 40 up and down is provided at the center of the upper frame 9.
, An air cylinder 42 is disposed downward. Each cooling unit is provided with a bracket 4 engaged with a tip of a piston rod 42a of the air cylinder 42.
3 is connected to a horizontal portion of a bracket 44 having an L-shaped cross section. A guide rail 45 is provided on the back surface of the vertical portion of the bracket 44, and the linear bearing 46 fixed vertically to the upper frame 9 shown in FIG. Is engaged. By expansion and contraction of the air cylinder 42,
The cooling unit provided at the outer end of the horizontal portion of the bracket 44 closes the cup holder 22 (FIG. 4).
Can be moved up and down between the remote position (FIG. 2). Next, the configuration of a cooling air pipe for supplying compressed air to the fluid ejection hole will be described. As shown in FIG. 7, three fluid ejection holes 41a drilled in the same horizontal plane of the nozzle bar 41 are connected to each other by a cooling pipe 51, and the side of the cooling pipe 51 opposite to the nozzle bar 41 as shown in FIG. It is connected to a cooling distribution stand 52. Six such cooling pipes 51 are provided for each cooling unit, and each cooling pipe 51 has an optimum height (Ea, Eb, Ec, and Ec in FIG. 5) in advance according to the actual condition of the casting. E
e, Eh, and Ei) out of a large number of fluid ejection holes 41a respectively drilled in the same horizontal plane.
The fluid ejection holes 41a are connected to each other, and are connected to the cooling distribution stand 52 via piping joints indicated by Ea, Eb, Ec, Ee, Eh, and Ei in FIG. On the other hand, the cooling distribution stand 52 includes the Ea,
An air passage communicating with piping joints indicated by Eb, Ec, Ee, Eh, and Ei is respectively formed, and a detachable joint which can be instantaneously attached to and detached from one end of the air passage which is opened on the upper surface of the cooling distribution stand 52. (Male) 55 are provided respectively. Further, the cooling air supplied from an air supply source (not shown) is branched into two systems by an air passage formed in the cooling distribution block 54 as shown in FIG.
Each of the branched air passages is connected via a cooling hose 53, a flow control valve 57, and a detachable joint (female) 56 which can be instantaneously attached and detached.
55 is freely connectable. On the other hand, a detachable joint (male) 58 for stopping and placing the unused cooling hose 53 is provided separately from the detachable joint (male) 55, and the air passage following the detachable joint (male) 58 has a dead end. It has become. Next, the configuration of the heating unit 60 will be described in detail. As shown in FIG. 2, a heating unit 60 provided at a work station indicated by H in FIG. 1 includes a cup lid 28 having a concave portion 28a opened on the lower end surface side, and moves the cup lid 28 up and down. An air cylinder 62, which is a third elevating means, is disposed upward on the upper surface of the upper frame 9, and an adapter rod 63 is provided at an end of the piston rod 62a of the air cylinder 62 via an upward bracket 66. A bush 65 that is connected and guides the lifting and lowering of the adapter rod 63 is disposed on the upper surface of the upper frame 9. A high-frequency heating device 61 having a heating coil 61a wound so that the cup lid 28 can move up and down the central space.
Are disposed on the main frame 7 via a horizontal bracket 66. On the other hand, an air cylinder 72, which is a second elevating means for driving the cup seat 24 and the molten metal cup 23 up and down, is disposed downward on the side surface of the main frame 7, and a tip of a piston rod 72a of the air cylinder 72 is provided. Is connected to an adapter rod 73 via a lateral bracket 76, and a bush 77 for guiding the lifting and lowering of the adapter rod 73 is provided on the lower surface of the base plate 4. A guide rail 75 fixed to the main frame 7 in a vertical direction and a linear belling 74 disposed on the bracket 76 are engaged so as not to be detached when sliding up and down. An outline of the operation of the apparatus 100 for producing semi-solid metal configured as described above will be described. At a work station indicated by B in FIG. 1, a predetermined amount of molten metal is poured into the molten metal cup 23 by a hot water supply device (not shown), and the table rotating device 3 is driven for each casting shot to drive the turntable 1. 1/8 turn, C, D, in FIG.
While sequentially moving the molten metal cup 23 to each of the work stations indicated by E, F, G, and H, the cooling device 40 removes the molten metal in the molten metal cup 23 at each of the work stations indicated by C, D, E, F, and G. At the work station indicated by H in FIG. 1, high-frequency induction heating is performed by the heating unit 60 to adjust the temperature of the molten metal in the molten metal cup 23 to generate fine and uniform crystals, thereby obtaining a predetermined solid phase ratio. And transfers the semi-molten metal to a robot (not shown) at a work station indicated by A in FIG. Next, the operation of the cooling unit 40 when cooling the molten metal in the molten metal cup 1 will be described. As shown in FIG. 2, from the state where the cooling device 40 is standing by at the ascending limit position, the rotary table 1 is rotated by １ ／ and the cup holders 22 arranged at equal intervals on the rotary table 1 are provided. After moving and positioning the cup 23 and the cup seat 24 at predetermined positions of the respective work stations, when the air cylinder 42 is driven to lower the cooling device 40, as shown in FIG. Cover the upper end surface of each molten metal cup 23. Place the upper end of the molten metal cup 23 on the cup lid 2
6, the compressed air adjusted to a predetermined flow rate is ejected from a fluid ejection hole drilled in each nozzle bar 41 toward the outer peripheral surface of the inner molten metal cup 23, and stored in the molten metal cup 23. Although the molten metal is cooled, the upper end surface of the molten metal cup 23 is closed by the cup lid 26 during the cooling, so that the heat is not distributed only to the molten metal on the molten metal side, and the entire molten metal is uniform. It is designed to be cooled.
It is desirable to use a ceramic having excellent heat resistance and heat retention as a material of the cup lid 26. With the change of the cast product, the molten metal cup 23
When the size of the molten metal, the amount of molten metal stored in the molten metal cup 23 and the type of molten alloy are changed, air is ejected from the fluid injection hole having the optimum height for uniformly cooling the molten metal stored in the molten metal cup 23. Ea, Eb, Ec,
One or two desired cooling pipes 51 are selected from the cooling pipes 51 provided at the heights indicated by Ee, Eh, and Ei, and the cooling hose 53 is connected. At this time, the cooling hose 53 not connected to the cooling pipe 51 is connected to a detachable joint (male) 5 having a dead end in the air passage.
By connecting to 8, the cooling hose 53 can be prevented from wobbling when the cooling unit 40 moves up and down. In addition, each cooling pipe 51 has three fluid ejection holes 41.
In addition to being branched and connected to a, a connection joint between the cooling hose 53 and each cooling pipe 51 employs a detachable joint which can be instantaneously attached and detached. The work of rearranging can be performed quickly and reliably. Next, the operation of the heating unit 60 when heating the molten metal in the molten metal cup 1 will be described. FIG.
As shown in FIG. 7, the rotary table 1 is moved from the state where the cup lid 28 stands by at the upper limit position and the adapter rod 73 stands by at the lower limit position, and
After rotating and moving and positioning the cup holder 22, the molten metal cup 23 and the cup seat 24 arranged at equal intervals on the rotary table 1 to predetermined positions of the respective work stations, the air cylinder 62 is driven. When the cup lid 28 is moved down, the recess 28a of the cup lid 28 is
Covers the upper end surface of the molten metal cup 23. When the air cylinder 72 is driven to raise the adapter rod 73 from a state in which the upper end surface of the molten metal cup 23 is closed with the concave portion 28a of the cup lid 28, the engaging portion 73a at the upper end of the adapter rod 73 is brought into contact with the cup. The molten metal cup 2 is attached to a recess formed in the center of the lower end of the receiving seat 24 by the cup lid 28 and the adapter rod 73.
3 and the cup seat 24 are sandwiched.
From this state, the air cylinder 72 and the air cylinder 62 are further synchronized and driven to move upward, and the molten metal cup 23 and the cup receiving seat 24 are pulled out above the cup holder 22, and then the cup lid 28, the molten metal cup 23 and The cup seat 24 is held inside the heating coil 61a of the high-frequency heating device 61, and high-frequency induction heating is performed so that the entire semi-molten metal in the molten metal cup 23 has a temperature optimum for rheocast casting. After the entire semi-molten metal in the molten metal cup 23 was subjected to high-frequency induction heating until the temperature reached an optimum temperature for rheocasting, the molten metal cup 23 and the cup seat 24 were held between the cup lid 28 and the adapter rod 73. The lifting actuator 72 and the air cylinder 62 remain
Are driven in synchronization with each other, and the molten metal cup 23 and the cup seat 24 are again mounted in the cup holder 22.
The original state shown in FIG. 2 is restored. As a feature of the high-frequency induction heating, the edge and the edge of the semi-molten metal which is relatively low in temperature are heated more than the central part, so that the effect of making the temperature distribution of the entire semi-molten metal uniform can be obtained. It is desirable to use ceramics that are excellent in heat resistance and heat retention and do not hinder high-frequency induction heating as the material of the molten metal cup 23, the cup seat 24, and the cup lid 28. In the description of the configuration and operation of the above embodiment, the semi-molten metal production apparatus 100 having eight work stations in total and five of these work stations as cooling work stations has been described. However, the present invention is not limited to this, and it is possible to provide a semi-molten metal manufacturing apparatus in which the total number of work stations and the number of cooling work stations are different from those of the present embodiment. As described above, the present invention exerts the following excellent effects. (1) By connecting a cooling hose to one or two desired cooling pipes, a fluid having an optimum height according to the size of the molten metal cup, the amount of molten metal stored in the molten metal cup, and the type of molten metal alloy Air is blown out from the blowout hole, and the molten metal stored in the molten metal cup can be cooled uniformly. (2) Since each cooling pipe is branched and connected to three fluid ejection holes, the number of attachment / detachment points when replacing the air piping system with the change of the casting product is reduced to 1/3 of the conventional one. In addition, since a connection joint between the cooling hose and each cooling pipe is provided with a detachable joint that can be instantaneously attached and detached, the work of changing the air piping system can be performed quickly and reliably.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a semi-molten metal manufacturing apparatus according to an embodiment of the present invention. FIG. 2 is a front view of a semi-solid metal manufacturing apparatus according to an embodiment of the present invention. FIG. 3 is a plan view of the table unit as viewed from the side of arrow c-c in FIG. 2; FIG. 4 is a front view of the cooling device during cooling according to the embodiment of the present invention. FIG. 5 is a front view of a cooling air pipe for supplying air to the cooling device according to the embodiment of the present invention. FIG. 6 is a plan view of a cooling air pipe viewed from the side of arrow aa in FIG. 4; FIG. 7 is a plan view of a cooling air pipe viewed from the side of arrow bb in FIG. 4; [Description of Signs] 1 Rotary table 3 Table rotating device 4 Base plate 5 Bracket 6 Bracket 7 Main frame 8 Support 9 Upper frame 22 Cup holder 23 Melt cup 24 Cup seat 26 Cup lid 26a Recess 28 Cup lid 28a Recess 40 Cooling device 40c Cooling unit 40d Cooling unit 40e Cooling unit 40f Cooling unit 40g Cooling unit 41 Nozzle bar 42 Air cylinder (first lifting / lowering means) 42a Piston rod 43 Bracket 44 Bracket 45 Guide rail 46 Linear bearing 50 Cooling air pipe 51 Cooling pipe 52 Cooling distribution Stand 53 Cooling hose 54 Cooling distribution block 55 Detachable joint (male) 56 Detachable joint (female) 57 Flow control valve 58 Detachable joint (male) 60 Heating unit 61 High frequency Heating device 61a Heating coil 62 Air cylinder (third elevating means) 62a Piston rod 63 Elevating shaft 65 Bush 66 Bracket 67 Bracket 72 Air cylinder (second elevating means) 72a Piston rod 73 Adapter rod 73a Engagement part 74 Linear bearing 75 guide rail 76 bracket 77 bush 100 semi-solid metal production equipment

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B22D 17/30 B22D 41/005

Claims (1)

(1) A semi-molten metal production apparatus for producing a semi-molten metal in a solid-liquid coexistence state in which a liquid phase metal in a molten state and a solid phase metal in a solid state are mixed. A rotary table for sequentially rotating a plurality of working stations by a fixed angle for each casting shot; a plurality of molten metal cups arranged at positions dividing the upper surface of the rotary table at equal intervals; The apparatus has a cup lid having an opening concave portion on a lower end surface side capable of closing an upper end portion of the molten metal cup into which the molten metal has been poured, and a plurality of ejection holes for ejecting a cooling fluid toward an outer peripheral surface of the molten metal cup. A cooling unit composed of a plurality of nozzle bars extending downward; elevating means capable of moving the cooling unit up and down; and relaying the cooling fluid supplied to the cooling unit to be instantaneously removable. A cooling distribution stand connected to the air supply source via a hose by a detachable joint, one end of which is connected to the cooling distribution stand, and the other end of which is located in the same horizontal plane of a plurality of nozzle bars constituting the cooling unit. A semi-molten metal manufacturing apparatus, comprising a plurality of sets of cooling pipes which are branched and connected to a plurality of fluid ejection holes drilled inside.