JPH0289549A - Injection pump for molten aluminum - Google Patents

Abstract

PURPOSE:To obtain an injection pump for molten aluminum having strong, difficult-to-break and easy maintenance by separately arranging the injection pump body, which is fitted with an injection sleeve of ceramic-made, etc., reinforced by a metal sleeve, from a molten metal holding furnace. CONSTITUTION:Ceramic or graphite-made insert 22 is cast in and a goose-neck pot 31 inserting the ceramic-made injection sleeve 23 pre-pressed with metal sleeve 24 at outer circumference into center hole part 20a is arranged as positioning on a supporting frame set 11a through a key 13. On the injection sleeve 23, molten metal basin 26 is positioned with a key 14 and fitted with a pushing plate 15 through a pushing sleeve 28. The molten Al is introduced into the above molten metal basin 26 from the molten metal holding furnace separately arranged from the above constituted injection pump 10 and further, introduced into the injection sleeve 23 through a T-shape flowing hole 33a of a plunger tip 33. This mold Al is injected into a die apparatus 2 from the above insert 22 through a molten metal flow passage 21 and a nozzle 3 by descending the plunger tip 33 with a hydraulic cylinder 30.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an injection pump for a hot die casting machine that is resistant to molten aluminum.

[Prior Art] A conventional molten aluminum injection pump for a hot chamber type tie casting machine will be described with reference to the drawings.

FIG. 3 is a cross-sectional view showing the configuration of the injection pump of a hot chamber die-casting machine. It is designed to supply.

A gooseneck 5 having a molten metal flow path for supplying molten aluminum from the molten metal insulating furnace 4 to the mold device 2 through the nozzle 3 is fixed to the bottom of the molten metal insulating furnace 4.
An injection sleeve 6 is mounted on top of the injection sleeve 6 by being pressed by a holding member 7, and a plunger tip 8 is fitted into the sleeve to form a pump, which is moved up and down by a hydraulic cylinder 9 connected to the upper part of the sleeve. The molten metal lO in the molten metal insulating furnace 4 is injected into the mold device 2 at high pressure.

[Problems to be Solved by the Invention] As described above, in order to inject molten aluminum into the mold device of a die-casting machine, it is necessary to provide a hole in the bottom wall of the molten metal insulating furnace.
It is now possible to do this by installing a gooseneck pot.

However, molten aluminum is subject to severe erosion, and for example, when a gooseneck pot reaches the end of its life and must be replaced, the machine must be stopped for a long time. In addition, the injection sleeve made of ceramics that is resistant to molten aluminum has low tensile strength, so if a foreign object gets caught between the injection plunger and the injection sleeve, the injection sleeve will be damaged, and it will take a long time to replace it. The machine had to be stopped between poems, which caused major problems in terms of production costs and safety.

This invention was made in view of these points, and by providing the pump separately from the molten metal insulating furnace, it is possible to perform maintenance such as replacing parts without touching the molten metal insulating furnace. Another object of the present invention is to provide a molten aluminum injection pump which is strengthened by backing up and reinforcing the ceramic injection sleeve with metal to reduce the probability of brittle fracture.

[Means for Solving the Problems] The present invention includes a gooseneck pot made of cast iron or heat-resistant steel in which a ceramic or carbon insert is cast into a molten metal flow path, and a fitting hole is bored in the center of the gooseneck pot. A cylindrical metal sleeve is fitted around the outer periphery of the ceramic injection sleeve, which is pre-compressed between it and the fitting hole of the gooseneck pot, and this injection sleeve is pressed, and at the same time, the molten metal reservoir formed of the ceramic fiber laminate is pressed. a cylindrical presser sleeve, a heating means for heating the gooseneck pot and maintaining its temperature, a constant melt level holding means for supplying molten metal to the molten metal reservoir and keeping it at a constant level, and an upper part of the gooseneck pot. A plurality of key grooves intersecting on the center line of the injection sleeve are provided on the surface and the bottom surface, and an alignment means is provided between the frame for supporting the key made of a heat insulating material, and the key groove is inserted into the injection sleeve. This is an injection pump for molten aluminum consisting of a ceramic injection plunger.

Further, in the injection pump for molten aluminum, the plunger tip of the injection plunger has a single-shaped inflow hole through which the molten metal flows, at the upper limit position of the injection plunger.

[Function] By providing the pump body and the molten metal heat retention furnace separately, parts can be replaced without touching the furnace body. In addition, the outside of the ceramic injection sleeve is backed up with a metal sleeve to reduce the probability of brittle fracture of the ceramic injection sleeve, making it possible to provide a safe injection pump for molten aluminum.

Furthermore, the center of the pump body and the center of the plunger tip can be easily aligned by providing radial key grooves on the upper and lower surfaces of the pump body and inserting and fixing keys.

[Example] The present invention will be described in detail below based on one drawing. Figure 1 shows I of Figure 2, which shows the configuration of an injection pump for molten aluminum.
A sectional view taken along line -I, and FIG. 2 is a front view showing the overall appearance of the injection pump for molten aluminum.

The injection pump IO is formed of a gooseneck pot 20 made of cast iron or heat-resistant steel, as shown in FIG.
a, and a small-diameter gooseneck pot-shaped molten metal channel 21 that communicates with this hole 20a and the lower part via a step 20b.
The molten metal channel 21 is connected to the mold device 2 of the die-casting machine via the nozzle 3 at the upper left side. The molten metal flow path 21 is formed by inserting a ceramic or graphite insert 22 into the gooseneck pot 20, making the gooseneck pot 20 resistant to molten aluminum and preventing it from being corroded by the molten aluminum. .

An injection sleeve 23 made of ceramics is inserted onto the stepped portion 20b of the gooseneck pot 20 with a metal sleeve 24 made of steel fitted around its outer periphery. Therefore, injection sleeve 2
3 is a gooseneck pot 2 due to its simple configuration without side holes.
0 through the cylindrical metal sleeve 24, and is reinforced and installed in a preloaded state.

On the upper end surface of this metal sleeve 24, there is a molten metal reservoir 2 made of heat-resistant aluminum molten metal, which is formed from a laminated ceramic fiber material with a large diameter at the top and has an integral molten metal supply pipe 26a on the right side.
6 is placed, and the lower end surface of the presser sleeve 28 presses and fixes the upper end surface of the injection sleeve 23 and the bottom of the molten metal reservoir 26 together. The upper part of this presser sleeve 28 is attached and fixed to the presser plate 15. A communication hole 28a is provided in the lower side wall of the presser sleeve 28, so that the inside and outside communicate with each other to form a molten aluminum pool. Further, a molten metal level sensor 35 attached to the suppression plate 15 is provided above the molten metal pool, and a footbath level control means for supplying molten aluminum from a molten metal insulating furnace (not shown) so as to keep the molten metal level in the molten metal pool constant. is connected to the controller.

An electric heater 31 is installed on the outer periphery of the gooseneck pot 20.
A cover 32 made of a heat insulating material is provided to cover the body to keep it warm.

” Inside the bipedal injection sleeve 23 is a single-shaped molten metal inflow hole 33.
The plunger tip 33 formed with a is fitted, and its upper part becomes conical, and the ball bearing 33b at the tip is connected to the coupling 3.
4 to an injection cylinder 30 operated by hydraulic pressure or the like provided on the upper support frame 11, and is driven to move up and down. At the upper limit position of the plunger tip 33, the molten aluminum in the molten metal reservoir 26 is formed to easily flow into the injection sleeve 23.

The injection pump 10 for molten aluminum configured as described above is as follows:
As shown in FIG. 2, it is placed on a pedestal 11a provided at the center of an immovable support frame 11 via a heat insulating mat 12. At this time, the above gooseneck pot 20
radially on the bottom wall and the pedestal 11a, for example, vertically.
Key grooves are drilled in the horizontal cross direction at corresponding positions, and keys 13 made of heat-resistant material are fitted into these grooves, positioned, and placed.

Further, in the upper part, key grooves are bored in the radial direction on the lower surface of the pressing plate 15 and the upper part of the gooseneck pot 20, and a key 14 made of a heat insulating material such as ceramics is similarly fitted into this key groove. or positioning and a line is carried out. Also,
Protrusions 15a are also provided on the left and right sides of this pressing plate 15,
The key 14 is also fitted between the key groove 11b provided in the immovable support frame 11 and positioned.

Note that a key groove may be provided in place of the projection 15a, and a key may be fitted therein. A tie rod 16 is inserted into both ends of this suppression plate 15, and a spring 17 and a nut 1 are inserted.
The support frame 11 is
is fixed to the pedestal 11a.

Therefore, the center of the injection pump IO, that is, the center of the ceramic injection sleeve 23 and the center of the injection plunger 33 fitted therein, are positioned by the keys 13 and 14 provided on the upper and lower surfaces to maintain the center position. is formed.

Next, the operation of the molten aluminum injection pump configured as described above will be explained. In Fig. 1, injection pump 1
0 is connected via a nozzle 3 to a mold device 2 fixed to a die plate of a left die casting machine (not shown). On the other hand, a molten metal insulating furnace (not shown) is installed on the right side, and a molten metal supply pipe 26a integrally provided in the upper molten metal reservoir 26 communicates with this molten metal insulating furnace via a joint or the like. and,
The molten aluminum in the molten metal insulating furnace is brought to a constant height by the molten metal reservoir 26 using an electromagnetic pump or the like, as determined by the molten metal level sensor 35. That is, it is supplied in a constant amount.

Then, by operating the injection cylinder 30, the molten aluminum in the injection sleeve 23 passes through the gooseneck-shaped molten metal channel 21 and is injected into the mold device 2 through the nozzle 3 at high pressure.

Therefore, the gooseneck pot 2o made of cast iron or heat-resistant steel, which is the main body of this injection pump 1O, is strong because it is inserted with ceramic or graphite material to prevent it from being corroded by molten aluminum. In particular, the injection sleeve 23 made of ceramics is the gooseneck pot 2.
The gooseneck pot 20 is reinforced with a metal sleeve 24 between the gooseneck pot 20 and the gooseneck pot 20, which is made of molten aluminum to be liquid-tight and corrosion-resistant.

The injection pump 1o is installed between the die plate of the die-casting machine and the molten metal insulating furnace, and is configured such that the injection pump 10 itself can be removed and replaced for maintenance.

[Effects of the Invention] As explained above, the injection pump for molten aluminum of the present invention has a metal sleeve that preloads and reinforces the outer periphery of the ceramic injection sleeve.

In order to prevent the molten aluminum from flowing into the metal sleeve, the bottom surface of the ceramic fiber molten pool is pressed against the ceramic injection sleeve. Therefore, it is possible to form a strong pump for molten aluminum.

In addition, in order to maintain the center of the pump body, which is also the center of the ceramic sleeve, and the center of the plunger tip, radial key grooves are provided on the top and bottom surfaces of the pump body, and the insulation key is inserted. You can easily get 6 out of this.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the configuration of an injection pump for molten aluminum showing an embodiment of the present invention, Fig. 2 is a front view of the molten aluminum injection pump, and Fig. 3 is a
FIG. 1 is a cross-sectional view showing the configuration of a conventional hot chamber die-casting machine. 10... Injection pump 11... Support frame 13.14... Key 15... Suppressing plate 16... Tie rod 20... Gooseneck pot 21... Molten metal flow path 22... Insert 23... ... Injection sleeve 26 ... Molten metal reservoir 30 ... Hydraulic cylinder 33 ... Plunger tip 35 ... Constant molten metal level sensor Fig. 1

Claims (1)

[Claims] 1. An injection pump that pumps molten aluminum includes a gooseneck pot made of cast iron or heat-resistant steel with a ceramic or carbon insert cast into the molten metal flow path, and a hole bored in the center of the gooseneck pot. A cylindrical metal sleeve is fitted around the outer periphery of the ceramic injection sleeve, which is preloaded with the gooseneck pot, and this injection sleeve is pressed, as well as a molten metal reservoir made of ceramic fiber laminated material. a cylindrical holding sleeve; a heating means for heating the gooseneck pot and maintaining the temperature; a constant level holding means for supplying molten metal to the molten metal reservoir and maintaining it at a constant level; and an upper surface of the gooseneck pot. and a plurality of keyways intersecting on the center line of the injection sleeve on the bottom surface,
An injection pump for molten aluminum, comprising an alignment means disposed between a frame supporting a key made of a heat insulating material, and a ceramic injection plunger inserted into the injection sleeve. 2. The injection pump for molten aluminum according to claim 1, wherein the plunger tip of the injection plunger is provided with a T-shaped inflow hole through which the molten metal flows at the upper limit position of the injection plunger.