JPH0211964Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hot chamber die casting machine. Specifically, in a hot chamber die casting machine in which the fixed mold is urged toward the nozzle to prevent leakage of molten metal from the joint surface between the fixed mold and the nozzle, there is a method for preventing deformation of the gooseneck due to the urging force. Regarding equipment.

[Prior art] The conventional hot chamber die-casting machine
As shown in the figure. In the figure, a holding furnace 11 is made up of a box-shaped frame 12 and a plurality of layers of ceramic boards 13 made of calcium phosphate or the like laminated on its inner surface. A lid 16 having a heater 15 for keeping the molten metal 14 warm is placed thereon.

The base end of a gooseneck 18 whose inner surface is lined with a melt-resistant aluminum material 17 is inserted into a hole drilled at approximately the center of the bottom of the holding furnace 11, and the base end of the gooseneck is secured to the frame by a bolt 19 inserted into a flange 18A. 12. The outer circumference of the base end of the gooseneck 18 and the ceramic board 1
3 and between the flange 18A and the frame 12, sealing materials 20 and 21 are interposed, respectively. Incidentally, the end face of the gooseneck 18 is substantially flush with the upper surface of the inner ceramic board 13.

A gasket 22 is attached to the end face of the goose neck 18.
A plunger sleeve 23 made of melt-resistant aluminum ceramic is disposed through the plunger sleeve 23. The plunger sleeve 23 is attached to a bracket 25 on a frame 24 attached to a die-casting machine main body (not shown).
is vertically supported within the holding furnace 11 via the
A plunger hole 23A communicates with the molten metal passage of the goose neck 18 at the center and a holding furnace 11 at the outer peripheral surface.
Each plunger has a plurality of suction ports 23B for sucking the molten metal 14 therein into the plunger hole 23A.

Plunger hole 23A of plunger sleeve 23
A plunger tip 26 having a plunger rod 27 is housed in the plunger so as to be slidable vertically. The tip of the plunger rod 27 is connected via a coupling 28 to a piston rod 30 of an injection cylinder 29, which is supported vertically on the bracket 25. Here, the plunger sleeve 23, the plunger tip 26, and the injection cylinder 29 constitute a pump body 38.

On the other hand, one end of the nozzle 31 abuts against the fixed mold 32 and the other end of the nozzle 31 abuts the tip of the gooseneck 18 . Therefore, when the plunger tip 26 is raised by driving the injection cylinder 29, the molten metal 14 in the holding furnace 11 is transferred to the plunger sleeve 23.
is sucked into the plunger hole 23A from the suction port 23B. Eventually, when the plunger tip 26 descends after reaching the top dead center, the molten metal 14 in the plunger hole 23A passes from the nozzle 31 through the molten metal passage of the goose neck 18 and is formed between the fixed mold 32 and a movable mold (not shown). Injected into the cavity.

At this time, there is a risk that the molten metal 14 may leak from the joint surface between the nozzle 31 and the fixed mold 32, so in order to prevent this, the fixed base 33 to which the fixing fitting 32 is attached is connected to the nozzle 31 using the nozzle touch hydraulic cylinder 34. It is biased in the direction. Then, since the biasing force generated by the nozzle touch acts on the tip of the gooseneck 18 through the nozzle 31, the problem remains that the gooseneck 18 is deformed.

In order to prevent this, a stopper that receives the urging force from the nozzle touch may be provided at the tip of the gooseneck 18. However, if the stopper is of a fixed type, the gooseneck 18 may be damaged due to temperature changes in the molten metal, etc.
cannot cope with expansion and contraction. So, goose net 1
A backstop hydraulic cylinder 35 is provided between the tip of the gooseneck 8 and the frame 24, and is controlled by a pilot check valve 36 and a 4-port 2-position electromagnetic switching valve 37 to reduce the biasing force exerted by the nozzle touch on the tip of the gooseneck 18. It is structured to accept it.

[Problems to be solved by the invention] In the structure shown in FIG. 4, a hydraulic cylinder 35, a pilot check valve 36 and a
Since the port 2-position electromagnetic switching valve 37 is required, the structure is complicated.

In addition, the backstopper hydraulic cylinder 35 must be installed in a narrow space between the gooseneck 18 and the frame 24, making the work difficult and requiring cooling of the equipment during the work due to the high temperature of the surrounding area. .

The purpose of the present invention is to solve these problems and to provide a hot chamber die-casting machine that has a simple structure, allows the gooseneck to expand and contract due to temperature changes, and prevents the gooseneck from deforming due to the biasing force of the nozzle touch. It is about providing.

[Means for Solving the Problems] Therefore, in the present invention, a pump body is provided in a holding furnace for storing molten metal for sucking the molten metal and discharging it to a gooseneck, and one end is attached to a fixed mold at the tip of the gooseneck. In a hot chamber die casting machine in which the other end of the abutting nozzle is abutted and the stationary mold is biased toward the nozzle, the tip of the gooseneck is inserted through a gap to the tip of the gooseneck. A fixed block having a pressure receiving surface that receives a biasing force acting on the block is fixed, a wedge-shaped movable piece is provided between the pressure receiving surface of the fixed block and the tip of the gooseneck, and the wedge surface of this movable piece is connected to the pressure receiving surface and the tip of the gooseneck. It is characterized by the provision of a spring that constantly biases the movable piece in the direction of contact with the tip of the gooseneck.

[Function] Therefore, when the tip of the gooseneck extends, for example, toward the nozzle due to the heat of the molten metal, the movable piece moves by that amount due to the spring, and the wedge surface of the movable piece comes into contact with the corresponding surfaces of the gooseneck and the fixed block. As a result, the movable piece and the fixed block can reliably receive the urging force from the nozzle touch. Therefore, it is possible to prevent the gooseneck from deforming while allowing the gooseneck to expand and contract due to temperature changes.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. In addition, in the following explanation, the same reference numerals are given to the parts that have the same functions as in Fig. 4.
Omit or simplify the explanation.

FIG. 1 shows this embodiment. In this embodiment, a wedge-shaped backstop mechanism 41 is provided in place of the backstop hydraulic cylinder 35, pilot check valve 36, and 4-port 2-position electromagnetic switching valve 37 shown in FIG.

The backstop mechanism 41 is connected to the frame 24.
The surface facing the back surface of the tip of the gooseneck 18 (the surface opposite to the nozzle 31) through a gap is a pressure receiving surface 42A that is substantially orthogonal to the urging direction of the nozzle touch hydraulic cylinder 34. A block 42, a guide shaft 43 vertically screwed onto the upper surface of the fixed block 2, a wedge-shaped movable piece 44 provided so as to be movable up and down in the vertical direction along this guide shaft 43, and this movable piece 44. The wedge surfaces 44A and 44B are constituted by a spring 45 that constantly biases the movable piece 42 in a direction in which it contacts the pressure receiving surface 42A and the back surface of the tip of the gooseneck 18.

One wedge surface 44A of the movable piece 44 facing the fixed block 41 is formed on a vertical surface that contacts the pressure receiving surface 42A of the fixed block 42. Also,
The other wedge surface 44B of the movable piece 44, which faces the back surface of the tip end of the gooseneck 18, is formed as an inclined surface that slopes toward the nozzle 31 as it goes upward. The other wedge surface 44B is in contact with an abutment surface 18B formed on the rear surface of the tip of the gooseneck 18 in a slightly inclined shape with respect to the pressure receiving surface 42A.

Therefore, the heat of the molten metal 14 causes the gooseneck 18 to
When the tip of the movable piece 44 extends and moves to the left in FIG. Therefore, the force of the nozzle touch by the hydraulic cylinder 34 is transferred to the movable piece 4.
4 and the fixing block 42, it is possible to prevent the gooseneck 18 from deforming while allowing the gooseneck 18 to expand and contract due to temperature changes.

Furthermore, compared to the conventional one, since the hydraulic cylinder 35, pilot check valve 36, and 4-port 2-position electromagnetic switching valve 37 are not required, the structure is simple and inexpensive.

Furthermore, even in a narrow space, it is only necessary to fix the fixing block 42 there, so the work can be done quickly and easily.

In the above embodiment, the pressure receiving surface 42A of the fixed block 42 is formed into a vertical surface substantially perpendicular to the urging direction of the nozzle touch hydraulic cylinder 34, but it may also be configured as shown in FIGS. 2 and 3, for example. It's okay. This is the pressure receiving surface 52 of the fixed block 52.
A is an inclined surface that is inclined with respect to the urging direction of the nozzle touch hydraulic cylinder 34, and the contact surface 18A of the gooseneck 18 is a vertical surface that is substantially perpendicular to the urging direction of the nozzle touch hydraulic cylinder 34. , wedge surfaces 54A, 5 of the movable piece 54
4B has an inclined surface and a vertical surface that are in contact with the pressure receiving surface 52A and the contact surface 52A. just,
In this case, the movable piece 54 is used instead of the guide shaft.
Guide piece 52B for vertically movably guiding the
are integrally formed on both sides of the fixed block 52.

Further, the pump body 33 is not limited to the structure described in the above embodiment, and the structure of the holding furnace 11
Any device may be used as long as it can suck in the molten metal 14 inside and discharge it into the molten metal passage of the gooseneck 18.

In the above embodiment, the base end of the gooseneck 18 is fixed to the holding furnace 11, but the plunger sleeve 23 is fixed inside the holding furnace 11, and the lower end of this plunger sleeve 23 is made to protrude from the bottom surface of the holding furnace 11. A structure may be employed in which the base end of the gooseneck 18 is connected to the lower end.

[Effects of the invention] As described above, according to the invention, the gooseneck can expand and contract due to temperature changes with a simple structure, and
It is possible to reliably receive the force from the nozzle touch and prevent deformation of the gooseneck.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the hot chamber die casting machine of the present invention, Fig. 2 is a view showing the backstop mechanism, Fig. 3 is a sectional view showing a part thereof, and Fig. 4 is a sectional view of a conventional hot chamber die casting machine. FIG. 1 is a cross-sectional view showing a chamber die-casting machine. 11... Holding furnace, 14... Molten metal, 18... Gooseneck, 23... Plunger sleeve, 26...
... Plunger tip, 29 ... Injection cylinder, 3
1... Nozzle, 32... Fixed mold, 34... Hydraulic cylinder for nozzle touch, 38... Pump body,
41, 51...Backstop mechanism, 42, 52
... Fixed block, 42A, 52A ... Pressure receiving surface,
44, 54...Movable piece, 44A, 44B, 54
A, 54B... Wedge surface, 45, 55... Spring,
18B...Abutment surface.

Claims (1)

[Scope of utility model registration request] A pump body for sucking the molten metal and discharging it to a gooseneck is provided in a holding furnace for storing molten metal, and the other end of a nozzle, one end of which is in contact with the fixed mold, is brought into contact with the tip of the gooseneck, and the other end of the nozzle is brought into contact with the tip of the gooseneck. In the hot chamber die casting machine, a fixing block having a pressure-receiving surface that receives a biasing force acting on the tip of the gooseneck through a gap is fixed to the tip of the gooseneck. A wedge-shaped movable piece is provided between the pressure-receiving surface of the fixed block and the tip of the gooseneck, and a spring constantly biases the movable piece in a direction in which the wedge surface of the movable piece is in contact with the pressure-receiving surface and the tip of the gooseneck. A hot chamber die casting machine characterized by: