JPH0677960U - Cooling device for vertical casting sleeve - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a cooling device for a vertical casting sleeve, which prevents abnormal deformation and galling of the casting sleeve and ensures long-term continuous stable operation reliably and easily. [Structure] A plurality of cooling jackets are provided on the outer periphery of a vertical casting sleeve, and the cooling jacket has a cooling capacity so that the temperature of the casting sleeve becomes uniform in the axial direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cooling device for a vertical casting sleeve of a die casting machine.

[0002]

[Prior art]

 FIG. 3 is an enlarged vertical sectional view showing barrel deformation of a conventional casting sleeve. Conventionally, many die casting machines have the same mold clamping direction and injection direction, but in recent years, horizontal mold clamping and vertical casting in which molten metal is injected from below into a mold that has been horizontally clamped. Type die casting machine has been developed. This type of die-casting machine has a short length of molten metal in the casting sleeve before injection, which reduces the temperature drop of molten metal, and the contact area between molten metal and air or the mixture of molten metal and air during injection. There are many advantages such as a small amount of cavities caused by gas in the casting sleeve and effective pressure transmission due to the injection plunger facing the cavity when filling is completed. Have

[0003]

[Problems to be solved by the device]

 By the way, in the casting operation of the die casting machine with the above structure, the product obtained by solidifying the molten metal injected into the mold cavity is pushed out from the mold cavity after the mold is opened. The casting sleeve 48 is cooled until the next injection. However, if the molten metal is fed into the casting sleeve before injection by the conventional structure in which the outer circumferential portion of the casting sleeve 48 in the axial direction is divided into a plurality of sections or a cooling jacket is provided in a single section, the pouring is not possible. Although the temperature rise of the casting sleeve 48 is prevented to some extent by the thermal diffusion of the molten metal from the upper opening side of the sleeve 48 and the lower side engaged with the plunger tip 50, the molten metal is prevented in the central region of the casting sleeve 48. Since the heat diffusion of the molten metal is prevented by the heat storage of, the uneven distribution of temperature in the casting sleeve 48 as shown in Fig. 3 causes the casting sleeve 48 to be barrel-shaped deformed (medium blistering). The molten metal is inserted between the deformed casting sleeve 48 and the plunger tip 50, and galling occurs between the casting sleeve 48 and the plunger tip 50, which prevents a smooth injection operation. Long-term continuous stable operation was difficult to.

The present invention focuses on the above-mentioned conventional problems, and provides a cooling device for a vertical casting sleeve that prevents abnormal deformation and galling of the casting sleeve and ensures long-term continuous stable operation easily and reliably. Is to provide.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the cooling device for a vertical casting sleeve according to the present invention is a vertical casting sleeve in which a molten metal is cast into a cavity of a mold which is clamped from directly below. The cooling jacket is divided into a plurality of parts on the outer peripheral portion in the axial direction of the casting sleeve, and the cooling jacket has a cooling capacity so that the temperature of the casting sleeve becomes uniform in the axial direction.

[0006]

[Action]

 According to the above configuration, a plurality of cooling jackets for preventing the temperature rise of the casting sleeve are provided in the casting sleeve axial direction, and the cooling jacket is provided in the casting sleeve area where the heat loss due to the molten metal is the smallest. It is possible to prevent the barrel-shaped deformation of the casting sleeve by making the partition volume of the largest and allowing a large amount of cooling water to pass.

[0007]

【Example】

 Hereinafter, a specific embodiment of a cooling device for a vertical casting sleeve according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a vertical sectional view showing an embodiment of a cooling device for a vertical casting sleeve according to the present invention, and FIG. 2 is a vertical sectional view of a horizontal die clamping, vertical casting die casting machine embodying the present invention. . In the figure, the 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 the floor surface. A cylinder platen (not shown) is provided at the other end of the machine base 24 so as to face the fixed platen 25. The fixed platen 25 and the cylinder platen are connected at their four corners by columns 27 fixed by nuts 26. Has been done.

Reference numeral 28 denotes a movable plate having a column 27 fitted therein so as to face the fixed plate 25, and is formed on the slide plate 24 a of the machine base 24 so as to be movable in the perspective direction with respect to the fixed plate 25. A toggle mechanism 29 connects the cylinder platen (not shown). Reference numeral 30 denotes a key 31 provided horizontally on the fixed platen 25, which is restricted from moving in the vertical direction, and positioned vertically at the center of the fixed platen 25 in the direction perpendicular to the paper surface. It is a fixed mold. The reference numeral 32 designates a movable mold which is mounted on the movable platen 28 with its key 33 restricted in vertical movement, and the molds 30 and 32 can be opened and closed horizontally with the dividing surface 34 as a boundary. Is joined to. 39 is a product extruding device for extruding the cast product from the cavity 35.

On the other hand, the vertical casting unit 23 is provided with four tie rods 40 whose upper ends are screwed into the screw holes provided in the horizontal member 25 a of the fixed platen 25 and which hang down. It passes through between both support members 24b and is engaged in the pit 41 provided under the floor. 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, a sleeve frame 49 having a casting sleeve 48 attached to the upper end thereof, and a plunger slidably provided in the casting sleeve 48. It comprises a tip 50 and a plunger 52 that connects the plunger tip 50 to the piston rod of the injection cylinder 47.

In the sleeve frame 49, there is a docking ram that is slidably provided in a cylinder hole (not shown), and the pressure oil is introduced into the cylinder hole through a vertical hole in the docking ram to move it to the position shown in the figure. Is configured to rise from. The upper end of the casting sleeve 48 is joined to the fixed sleeves 38 and 38a fitted in the vertical holes 37 provided in the lower surface split surfaces 34 of the molds 30 and 32 by the rise of the sleeve frame 49. Is configured. Reference numeral 36 is a constricted portion provided on the vertical hole portion 37, and reference numeral 25b is a cored bar L ring which is fixed to the horizontal member 25a of the fixed platen 25 and guides the casting sleeve 48.

Reference numeral 55 denotes a clevis-type tilting cylinder that tilts the entire injection device 45 for pouring, and the tilting cylinder 55 is mounted on a bracket 56 provided integrally with the connecting member 42b of the frame 42 and bearings. It is rotatably supported via a piston rod 57, and 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. The whole 45 is configured to be upright and tilted between the solid line position (upright position) and the chain line position (hot water supply position) in FIG. Reference numeral 60 denotes a ladle for supplying the molten metal to the casting sleeve 48, and 70 denotes a flexible water conduit.

Next, a cooling device for a vertical casting sleeve according to the present invention will be described with reference to FIG. A cooling jacket 62 (42a, 62b, 62c) divided into, for example, three sections is attached to the outer peripheral portion of the casting sleeve 48, and cooling water is supplied to the respective cooling jackets 62a, 62b, 62c from the same cooling pump. It is possible to pass water. Regarding the size of the compartment volume of the cooling jacket 62, the outer diameter of the cooling jacket 62 is the same for all the compartments, and only the length of the casting sleeve 48 in the axial direction is changed. Considering that the axial direction of the casting sleeve 48 is equally divided into an upper region I, a central region II and a lower region II I, an upper region having a molten metal-free upper end opening is formed. The partition volume of the cooling jacket 62a attached to I is the smallest, and therefore the amount of cooling water supplied from the cooling water supply port 65 of the cooling jacket 62a is the smallest.

Further, since a part of the heat amount of the molten metal is radiated by heat transfer from the plunger tip 50 and the plunger 52 side having a cooling water passage (not shown) inside, it is attached to the lower region III. The partition volume of the cooling jacket 62c is configured to be larger than that of the cooling jacket 62a, and the amount of cooling water supplied from the cooling water supply port 66 of the cooling jacket 62c becomes larger than that of the cooling jacket 62a. There is. Further, in the entire length of the casting sleeve 48, the cooling jacket 62b is configured so that the partition volume of the cooling jacket 62b attached to the central area II where the molten metal is retained inside and the heat radiation is the smallest is the largest, and the cooling of the cooling jacket 62b is performed. The flow rate of the cooling water supplied from the water supply port 67 is larger than that of the other cooling jackets 62a and 62c.

With the above-described structure in which the casting sleeve 48 such as the cooling jacket 62 is provided with the volume distribution partitioned in the axial direction, the casting sleeve 48 is melted by the molten metal supplied from the ladle 60. The temperature distribution in the axial direction becomes smaller in the order of central part region II> lower part region III, upper part region I, so that the exaggerated dimensional difference (barrel shape) in the axial direction of the casting sleeve 48 due to the so-called conventional temperature difference. (Deformation) is prevented, the diameter of the casting sleeve 48 can be kept substantially the same over the entire length of the casting sleeve 48, and the molten metal can be cast smoothly.

The operation of the die casting machine configured as above will be described. First, supply of cooling water to the cooling jacket 62 (62a, 62b, 62c) is started, and water is passed therethrough. 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 to the rod end side of the tilt cylinder 55 to allow the piston rod 57 to move. When is retracted, the entire injection device 45 tilts to the chain line position about the tilt shaft 42d. Then, after injecting the molten metal into the casting sleeve 48 by the ladle 60 of the water heater, pressure oil is introduced to the head end side of the tilting cylinder 55 and the injection device 45 is rotated. Stops in an upright position.

Prior to this, on the one hand, the movable platen 28 is advanced by the mold clamping cylinder via the toggle mechanism 29, and the mold clamping of both the molds 30 and 32 is completed, so that the cylinder hole and the injection cylinder are By simultaneously feeding oil to the nozzle 47, the sleeve frame 49 moves up while leaving the dockinggram in the molten metal holding state in which the plunger 52 has been lowered in the casting sleeve 48, and the casting sleeve 48 has a vertical hole portion. It is inserted into 37 and pressed against the lower end surfaces of the fixed sleeves 38, 38a. Then, when the oil is further sent 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 the pressure oil is drained from the cylinder hole to feed the oil to the rod end side of the injection cylinder 47 to lower the plunger tip 50, the plunger 52, the sleeve frame 49, etc. After separating the casting sleeve 48 from the molds 30, 32, the mold clamping cylinder is operated to open the mold, and the product is taken out from the movable mold 32 by using the product take-out device 39, thereby completing one cycle. .

In the present invention, the size of the cooling jacket 62 (62a, 62b, 62c) is changed so that the temperature of the casting sleeve 48 becomes uniform in the axial direction. By controlling the amount of water, the temperature can be controlled more easily and the desired temperature can be maintained.

[0020]

[Effect of device]

 As is clear from the above description, the present invention provides a vertical casting sleeve in which the molten metal is cast into the cavity of a mold which is clamped from directly below. A plurality of cooling jackets are provided on the outer peripheral portion in the axial direction, and the cooling ability of the cooling jacket is provided so that the temperature of the casting sleeve becomes uniform in the axial direction. When pouring is carried out, exaggeration of the portion of the casting sleeve where the molten metal is present can be prevented and the temperature distribution in the axial direction of the casting sleeve can be eliminated. It will not be scratched and damaged, improving durability.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a cooling device for a vertical casting sleeve according to the present invention.

FIG. 2 is a vertical sectional view of a horizontal die clamping, vertical casting die casting machine embodying the present invention.

FIG. 3 is an enlarged vertical sectional view showing barrel deformation of a conventional casting sleeve.

[Explanation of Codes] 21 Die casting machine 22 Horizontal mold clamping unit 23 Vertical casting unit 25 Fixed plate 28 Movable plate 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 70 Flexible water conduit

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29C 45/78 7365-4F

Claims (1)

[Scope of utility model registration request] 1. A vertical casting sleeve in which a molten metal is cast into a cavity of a mold which is clamped from directly below the cavity, wherein a plurality of cooling sleeves are provided on an outer peripheral portion in the axial direction of the casting sleeve. A cooling device for a vertical casting sleeve, comprising a jacket and having a cooling capacity of a cooling jacket so that the temperature of the casting sleeve becomes uniform in the axial direction.