JP2574195Y2 - Temperature control device for vertical casting sleeve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device for a vertical casting sleeve of a die casting machine.

[0002]

2. Description of the Related Art Conventionally, many die casting machines have the same mold clamping direction and injection direction. In recent years, however, a horizontal mold has been used in which molten metal is injected from below into a horizontally clamped mold. Tightening and vertical casting type die casting machines have been developed. This type of die-casting machine has the advantage that the length of the molten metal in the casting sleeve before injection is short and the temperature of the molten metal does not drop so much. There are many advantages, such as the small amount of cavities caused by gas in the casting sleeve and the effective transmission of pressure by the injection plunger facing the cavity when filling is completed. Have.

[0003]

[Problem to be Solved by the Invention] By the way, in the casting operation of the die casting machine having the above-described structure, the product obtained by solidifying the molten metal cast into the mold cavity is opened after the mold is opened. After being extruded from the mold cavity, the casting sleeve is cooled by a cooling jacket provided on the outer periphery in the axial direction of the casting sleeve until the next casting. Subsequently, when a molten metal of an aluminum alloy having a temperature of, for example, 650 to 800 ° C. is poured into the casting sleeve, a temperature distribution occurs in the axial direction of the casting sleeve. Heating and cooling are performed under severe conditions, such as passing cooling water through the cooling jacket to prevent the resin from being deformed into a drum shape due to resin dimensional differences, so the life of the casting sleeve is extremely short There was a drawback.

SUMMARY OF THE INVENTION The present invention is directed to a temperature control apparatus for a vertical casting sleeve, which focuses on the above-mentioned conventional problems and minimizes the temperature difference between the rise and fall of the casting sleeve to extend the life of the casting sleeve. It is.

[0005]

In order to achieve the above object, a temperature control device for a vertical casting sleeve according to the present invention casts molten metal into a cavity of a clamped mold from directly below. Vertical casting sleeve as described above,
A plurality of cooling jackets and a plurality of heating heaters are alternately arranged on an outer peripheral portion in the axial direction of the casting sleeve.

[0006]

According to the above construction, between the casting of the molten metal into the mold cavity and the next casting, the cooling water flows through the cooling jacket attached to the outer peripheral portion of the casting sleeve, and the casting sleeve cools down. The temperature of the casting sleeve is kept constant so that the temperature of the casting sleeve does not drop too much by energizing the heater so as not to overheat.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vertical casting sleeve temperature control device according to the present invention.

FIG. 1 is a longitudinal sectional view showing an embodiment of a temperature control device for a vertical casting sleeve according to the present invention, and FIG. 2 is a longitudinal sectional view of a horizontal clamping and vertical casting die casting machine embodying the present invention. is there. In the figure, a die casting machine 21 includes a horizontal mold clamping unit 22 and a vertical casting unit 23, and the entire horizontal mold clamping unit 22 is fixed on a machine base 24 fixed on a floor surface. At the other end of the machine base 24, a cylinder platen (not shown) is provided so as to face the fixed platen 25. The fixed platen 25 and the cylinder platen are connected at four corners by columns 27 fixed by nuts 26. ing.

Reference numeral 28 denotes a movable plate on which a column 27 is fitted so as to face the fixed plate 25. The movable plate 28 is formed on a slide plate 24a of the machine base 24 so as to be movable in the direction of the distance to and from the fixed plate 25. A toggle plate 29 is connected to a cylinder platen that is not used. Reference numeral 30 denotes a key 31 provided in the horizontal direction on the fixed platen 25, the movement of which is restricted in the vertical direction, and a key 31a provided vertically in the center of the fixed platen 25 for positioning in the direction perpendicular to the paper surface. It is a fixed mold. Reference numeral 32 denotes a movable die which is controlled by a movable platen 28 by a key 33 so as to be prevented from moving in the vertical direction. The two dies 30 and 32 can be freely opened and closed in a horizontal direction with a dividing surface 34 as a boundary. Is joined to. Reference numeral 39 denotes a product extruder for extruding a cast product from inside the cavity 35.

On the other hand, the vertical casting unit 23 comprises a fixed plate 25
Are provided with four tie rods 40 whose upper ends are screwed into the screw holes provided in the horizontal member 25a, and which hang down. The tie rods 40 pass between the two support members 24b of the machine base 24 and are provided below the floor surface. It is in the pit 41. Reference numeral 42 indicates a frame. The injection device 45 is tiltably supported by the frame 42 and the tilt shaft 43. That is, the injection device 45 includes an injection cylinder 47 having a rod-side block 46 having a plunger hole, and a sleeve frame 4 having a casting sleeve 48 attached to the upper end.
9. The plunger tip 50 slidably provided in the casting sleeve 48, and the plunger tip 50 is
And a plunger 52 connected to the piston rod.

Further, a docking ram slidably provided in a cylinder hole (not shown) is provided in the sleeve frame 49, and pressurized oil is introduced into the cylinder hole through a vertical hole in the docking ram to move from a position shown in the drawing. It is configured to rise. The upper end of the casting sleeve 48 is raised by the rise of the sleeve frame 49 so that the mold 30,
The lower sleeve 32 is configured to be joined to the fixing sleeves 38 and 38a fitted in the vertical holes 37 provided in the lower surface 34 of the lower surface. Reference numeral 36 denotes a constricted portion provided on the vertical hole 37, and reference numeral 25b denotes a core metal L fixed to the horizontal member 25a of the fixed plate 25 and guiding the casting sleeve 48.
It is a ring.

Reference numeral 55 denotes a clevis-type tilt cylinder for tilting the entire injection device 45 for pouring. The tilt cylinder 55 is mounted on a bracket 56 provided integrally with the connecting member 42b of the frame 42 via a bearing. The working end of the piston rod 57 is pivotally attached to the connecting plate 59 of the injection cylinder 47 by a pin 58, and the piston rod 57 is advanced and retracted by pressure oil.
The entire injection device 45 is configured to be upright and tilted between a solid line position (upright position) and a chain line position (hot water supply position) in FIG. Reference numeral 60 denotes a ladle for pouring molten metal into the casting sleeve 48, and reference numeral 70 denotes a flexible water pipe.

Next, the temperature control device of the vertical casting sleeve of the present invention will be described with reference to FIG. For example, the cooling jacket 62 divided into three sections is provided on the outer peripheral portion of the casting sleeve 48.
(62a, 62b, 62c) are attached, and each cooling jacket 62a, 62b, 6
It is configured such that cooling water can flow through 2c. The cooling jacket 62 has the same volume as the outer diameter of the cooling jacket 62 for all the sections and the same length as the axial direction of the casting sleeve 48 in the casting jacket 48.
2a, 62b, and 62c have the same volume. On the other hand, a plurality of cooling jackets 62 (62a, 6
2b, 62c), the casting sleeve 4 is cooled by passing water through the cooling jacket 62.
Heaters 69 are arranged alternately with the cooling jacket 62 on the outer peripheral portion in the axial direction of the casting sleeve 48 so as not to be overcooled, so that the temperature can be raised to a desired temperature by energizing the heater 69. ing.

The operation of the die casting machine configured as described above will be described. First, the cooling jacket 62 (62
a, 62b, 62c), the supply of the cooling water is started, and the water is passed through. When the sleeve frame 49 and the plunger 52 are lowered as shown in FIG. 2 and the injection device 45 is upright, pressure oil is introduced into the rod end side of the tilting cylinder 55 to retract the piston rod 57. Then, the entire injection device 45 is tilted to the dashed line position about the tilt axis 42d. Therefore, after injecting the molten metal into the casting sleeve 48 by the ladle 60 of the hot water supply device, the tilt cylinder 5
When the injection device 45 is rotated by introducing pressure oil to the head end side of No. 5, the injection device 45 stops in the upright posture.

Prior to this, on the one hand, the movable platen 28 has advanced through the toggle mechanism 29 by the mold clamping cylinder.
Since the mold clamping of both molds 30 and 32 has been completed, oil is simultaneously supplied to the cylinder hole and the injection cylinder 47,
The sleeve frame 49 ascends while leaving the docking ram with the plunger 52 lowered in the casting sleeve 48 while holding the molten metal.
And is pressed against the lower end surfaces of the fixed sleeves 38 and 38a. Then, when the oil is further fed to the injection cylinder 47, the plunger 52 and the plunger tip 50 rise, and the molten metal is lifted.

After the injection is completed, the molten metal is solidified and cooled, and pressure oil is extracted from the cylinder hole and fed to the rod end side of the injection cylinder 47 so that the plunger tip 50 and the plunger 5
2. After lowering the sleeve frame 49 and the like to separate the casting sleeve 48 from the molds 30 and 32, the mold clamping cylinder is operated to open the mold, and the product is moved to the movable mold using the product take-out device 39. One cycle ends by removing from 32.

Here, the temperature control of the casting sleeve 48 will be described in detail. First, the cooling jacket 62 (62a, 6
2b, 62c), the supply of cooling water is started, and water is passed. Next, the molten metal of the aluminum alloy having a temperature of, for example, 650 to 750 ° C. is poured into the casting sleeve 48 with the ladle 60 of the above-described hot water supply device while being tilted to the dashed line position shown in FIG. As a result, the temperature of the casting sleeve 48 rises, and a portion of the entire length of the casting sleeve 48 where the molten metal is present rises to 300 ° C. or more. After pouring the molten metal into the casting sleeve 48, the injection device 45 is set upright and the molten metal in the casting sleeve 48 is filled into the mold cavity 35.

When the filling of the molten metal into the mold cavity 35 is completed (or after a short time has elapsed), the heater 69 (69a, 69a,
69b, 69c) to start heating the outer peripheral surface of the casting sleeve 48. For this reason, a rapid temperature drop is prevented by only passing water through the cooling jacket 62, and a gradual temperature drop is performed. In this state, the flow of water through the cooling jacket 62 is stopped when the temperature of the inner wall of the casting sleeve 48 drops to about 200 ° C., a temperature gradient that can be predicted based on past empirical rules. However, at this point, the heating of the casting sleeve 48 by the heater 69 is continued, and the final inner wall temperature of the casting sleeve 48 is set to about 20
The temperature is set to 0 ° C. This is because when the lubricant is sprayed on the inner wall surface of the casting sleeve 48 by a lubricant spraying device (not shown) before the molten metal for the next shot is poured into the casting sleeve 48 in the next cycle. Sleeve 4
For example, if the inner wall temperature of No. 8 is about 250 ° C., the lubricant hardly adheres to the inner wall surface of the casting sleeve 48, so that the final inner wall temperature is set to about 200 ° C.

In this manner, one cycle time from the pouring of the casting sleeve 48 to the re-pouring for the next shot, that is, in the state where the mold closing is completed, the casting sleeve 48 is tilted at the tilted position. Pouring → Upright posture of casting sleeve 48 →
Filling the mold cavity 35 with molten metal → cooling and solidification → mold opening →
While the product unloading device → the mold closing is performed, on the other hand, the mold cavity 35 is kept in the upright posture of the casting sleeve 48.
After filling the molten metal, the cycle time of one cycle until the casting sleeve 48 is tilted again and the molten metal is poured is usually, for example, 3 to 4 minutes. The cooling is repeated every cycle.

[0020]

[Effect of the invention] As is clear from the above description,
The vertical casting sleeve temperature control device according to the present invention is a vertical casting sleeve for casting a molten metal into a cavity of a closed mold from directly below the cavity. By alternately arranging a plurality of cooling jackets and a plurality of heating heaters on the outer peripheral portion in the direction, the heat history of the casting sleeve is reduced, and the life of the casting sleeve is greatly extended.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a temperature control device for a vertical casting sleeve according to the present invention.

FIG. 2 is a longitudinal sectional view of a horizontal mold clamping and vertical casting type die casting machine embodying the present invention.

DESCRIPTION OF SYMBOLS 21 Die-casting machine 22 Horizontal mold clamping unit 23 Vertical casting unit 25 Fixed platen 28 Movable platen 30 Fixed mold 32 Movable mold 40 Tie rod 45 Injection device 48 Casting sleeve 50 Plunger tip 52 Plunger 62 (62a, 62b) , 62c) Cooling jacket 65, 66, 67 Cooling water supply port 69 (69a, 69b, 69c) Heater 70 Flexible water pipe

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B22D 17/12 B22D 17/20 B29C 45/62 B29C 45/74 B29C 45/78

Claims (1)

(57) [Scope of request for utility model registration] 1. A vertical casting sleeve in which a molten metal is cast into a cavity of a clamped mold from directly below the cavity, and a plurality of cooling sections defined on an outer peripheral portion in an axial direction of the casting sleeve. A temperature control device for a vertical casting sleeve, wherein a jacket and a plurality of heaters are alternately arranged.