JPS582534Y2 - Hot chamber die casting machine nozzle - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a nozzle for a hot chamber die-casting machine.

In hot chamber die casting equipment, molten metal in a melting furnace installed close to the die casting machine is injected into the mold cavity of the die casting machine in the required amount using an injection pump whose lower part is immersed in the molten metal. By,
Die-cast molding surface can be changed.

To explain the outline of the hot chamber type die-casting device with reference to FIG. A pump body 6 is movably inserted into the molten metal (hereinafter referred to as molten metal) 5 at 4 and attached to a tie bar 24 protruding from the center of the side surface of the fixed die plate 1, and is fitted with a bracket 20, a collar 26, a spring 27, and a nut 28.
It is fixed to the frame 25, which is pushed to the left in the figure, through the frame 25, and its lower part is immersed.

A predetermined tightening force is applied between the fixed mold 2 and the pump main body 6, so that the nozzle tip 15 and the nozzle 16 are held between them.

Reference numeral 7 denotes a push stand attached to the pump body 6, and a cylinder 8 is attached to the pump body 6 via the push stand 7.

At the tip of the piston rod 10 of the cast cylinder 9 attached to the frame 25, a plunger shaft 12 is attached to the tip of the plunger shaft 12, which is fitted with a plunger tip 13 that slides inside the cylinder 8 fitted into the pump body 6. 11. Attach via the pedestal 22.

As the piston rod 10 of the casting cylinder 9 descends, the plunger tip 13 descends.
Pressurizing chamber 1 of pump body 6 provided below cylinder 8
The molten metal 5 of No. 4 is pressed, and the nozzle tip 15 and the nozzle 16
It is cast into the fixed mold 2 through the.

Next, when the plunger tip 13 rises and returns to the position shown in FIG. It flows through the cylinder 8 and into the pressurizing chamber 14 and waits for the next operation.

In the hot chamber type die-casting apparatus configured in this way, the stationary die 2 needs to rapidly cool the press-fitted molten metal 5, and as shown in FIG.
Cooling water is passed through.

If the temperature of the nozzle 16 is low, the molten metal 5 passing through the nozzle 16 will solidify in the passage 21 and block the passage 21, so the nozzle 16 is constantly heated by a gas burner (not shown).

In particular, since the temperature of the fixed mold 2 is low, the end 23 of the nozzle 16
In this case, a large amount of heat flows out in the direction of arrow A, and the temperature of the end portion 23 of the nozzle 16 decreases, so the position shown by arrow B is strongly heated with a gas burner (not shown).

For this reason, the temperature at the tip of the end 23 of the nozzle 16 does not rise that much due to contact with the fixed mold 2, but the temperature rises at the part of the end 23 farther from the fixed mold 2, and the molten metal 5 that comes into contact with it causes the passage of the nozzle 16 to rise. 21 suffered from erosion as shown by the broken line 29, and the life of the nozzle 16 was extremely short.

The present invention has been developed in consideration of these points, and provides a nozzle for a hot chamber die-casting machine in which corrosion-resistant ceramic or carbonaceous pipes are inserted into the passages of the nozzle that are subject to erosion by the molten metal, thereby drastically reducing the erosion of the nozzle by the molten metal. The details of the present invention will be explained below with reference to the drawings.

As shown in FIG. 3, when a corrosion-resistant ceramic or carbonaceous pipe 31 is extended to the end surface of the nozzle 32, the pipe 31 is brittle, and the broken line 31 is caused by defects in the machining of the nozzle 32, defects during assembly, and damage during operation. Pipe 3 at position
There are many cases where part of 1 is missing.

On the other hand, the thin-walled tip 34 of the nozzle 32 is strongly cooled by the fixed die 2 and its temperature drops, so that the tip 34 blocks the passage of the molten metal 5.

Furthermore, as shown in Fig. 4, when the diameter of the pipe 31 is increased, the molten metal 5 press-fitted into the fixed mold 2 solidifies and becomes a product due to the missing part of the pipe 31 at the position of the broken line 38 as shown in the figure. When the product is pulled out to the left in the figure, it is stopped by the end 36 of the fixed mold 2, which causes many problems such as difficulty in ejecting the product.

Therefore, in the present invention, the diameter D1 of the passage 21 of the pipe 31 is made smaller than the hole diameter D2 of the fixed die 2, as shown in FIG.
It is designed to prevent coagulation that occurs around 9.

The ratio of Dl and D2 used here is 1:1, 5 to 2.
．． It is about 0.

As explained above, the present invention can provide significant benefits such as extending the life of the nozzle and simplifying its handling, reducing the downtime of the die-casting machine and reducing the number of workers.

[Brief explanation of drawings]

Figure 1 is a structural diagram of an injection pump for a hot chamber die-casting machine, Figure 2 is an enlarged cross-sectional view of the nozzle button in Figure 1 and the nozzle of the present invention, and Figures 3 and 4 show the structure of other nozzles. It is a partially enlarged sectional view shown. 2...Fixed type, 16.32...Nozzle, 21...
Passage, 31... Pipe, 33.38... Broken line, 34
... Point, 36... End, 39... Outlet end.

Claims (1)

[Scope of utility model registration request] A method of installing a corrosion-resistant ceramic or carbonaceous pipe on the nozzle of a hot chamber die-casting machine so as not to expose the end surface that contacts the mold, and using the inner hole of the pipe as a passage for the molten metal. The nozzle of the hot chamber type die-casting machine.