JP2523668Y2 - Ceramic pump for hot chamber die casting machine injection - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic pump for injection of a hot chamber die casting machine, such as molten aluminum, for obtaining the ceramic pump having excellent durability at low cost, and furthermore, metal leakage and pressure loss at the time of injection. It is an object of the present invention to provide a ceramic pump without any problem.

[0002]

2. Description of the Related Art A ceramic pump for injection of a hot chamber die casting machine for aluminum is disclosed in, for example, Shokai 6
There is a technique as proposed in Japanese Patent Application Laid-Open No. 3-184656. That is, the sleeve and the gooseneck are made of different and different materials and are connected by mechanical means. The gooseneck has a structure in which ceramics are cast in cast iron.

In the above publication, the holding furnace has a structure in which the holding furnace is lined with a plurality of layers of ceramic members of an iron frame, in which molten aluminum is stored and kept warm by a heater. Insert the tip of a gooseneck lined with a melt-resistant aluminum material on the inner surface of the drilled hole, and connect the tip of the gooseneck to the frame with a bolt inserted into the flange of the gooseneck, between the base outer periphery of the gooseneck and the ceramic member and It has been proposed to interpose a sealing material between the flange and the frame, and to dispose a sleeve made of a fusion-resistant aluminum ceramic via a packing on the end face of the gooseneck base end.

The sleeve is vertically fixed to a holding furnace by a bracket attached to a machine body, a plunger is inserted into the sleeve, and connected to a hydraulic piston rod via a coupling. That is, when the plunger descends and passes through the metal inflow hole, the metal in the sleeve is pressurized, is injected into the mold by the nozzle through the melt passage of the gooseneck, and is cast.

The ceramics used in the interior of the gooseneck cast iron have low mechanical strength but are resistant to molten aluminum and have good workability.
It has been proposed to use aluminum titanate as shown in FIG.

[0006]

In the above publications, the sleeve and the gooseneck are made of completely different materials, and are connected by mechanical means. The gooseneck is a runner through which the molten metal flows, and is one of the important structures that receives the squeezing pressure from the mold as the mounting pressure and transmits the mounting pressure to the frame body through the gooseneck itself. Since high strength and high toughness at high temperatures are required for the material, a single ceramic has a large problem in toughness, and a complicated structure has to be adopted.

Further, in the above-mentioned conventional type, in order to effectively use the plunger stroke in the sleeve, the gooseneck has a complicated shape to be mounted from below the holding furnace, and is, for example, silicon nitride which is considered to be most stable in molten aluminum. In the case of manufacturing with such a method, processing becomes impossible, or even if processing is possible, processing cost is remarkably increased, and since the shape is complicated, there is no sufficient reliability in strength.

The above-described Japanese Utility Model Application Laid-Open No. 63-184656 also has the following problems. 1) Manufacturing instability due to ceramic breakage during gooseneck casting. 2) Increased cost due to the addition of the gooseneck casting process. 3) Leakage of metal from the connection due to the gooseneck, sleeve, and holding furnace being completely different materials. 4) Pressure loss due to the gooseneck having at least two right angles.

[0009]

According to the present invention, as a result of studying to solve the technical problems in the prior art as described above, the shape and material of the injection cylinder are specified. A preferred solution has been obtained and is as follows.

A hot chamber characterized in that a straight injection cylinder is provided at an angle of 13 to 25 degrees from a horizontal plane with respect to a horizontal plane from a base of a main cylinder having a plunger and within a range of a molten metal level in a melting and holding furnace. Ceramic pump for die casting machine injection.

[0011]

The molten metal surface of the holding furnace is provided by providing a straight injection cylinder part at an angle of 13 to 25 degrees from the horizontal plane with respect to the horizontal plane from the base of the main cylinder having the plunger and within the height range of the molten metal surface in the melting furnace. With this relationship, a sufficient injection capacity can be obtained. In addition, the shape of the injection cylinder is simplified, and a stable pump that can withstand the mounting pressure with the mold sufficiently and has a small pressure loss is obtained.
Furthermore, a relatively compact and favorable casting into the mold can be performed.

The angle of the linear injection cylinder from the base of the main cylinder is 1
If it is less than 3 mm, the length of the injection cylinder becomes abnormally long.
If it exceeds 5 °, the length becomes extremely short, and in any case, a preferable molten metal injection cannot be performed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention as described above will be described. FIG. 1 shows the general relationship of a hot chamber injection unit in which a pump according to the present invention is set in a holding furnace. . That is, a melting and holding furnace 1 for melting an amyl alloy and maintaining the same at a constant temperature is installed on a gantry 2, and the gantry 2 is provided with an electric heater 3 and a mold 4
Is attached to the die plate 5 and is in contact with the nozzle 11 of the injection cylinder 10a. The pressure between the die 4 and the nozzle 11 is obtained by tightening and pressing the gantry 2 and the die plate 5 with the clamp 6.

The above-mentioned tightening pressure is applied to the nozzle 11
Through the injection cylinder 10a, which is a so-called gooseneck,
It is transmitted to a main cylinder 10 which is a so-called sleeve, and finally received by a gantry 2 via a melting furnace and holding furnace 1. 1, the main cylinder 10 and the injection cylinder 10a are integrally formed, set in the molten aluminum 15 stored in the melting furnace 1, and held by bolts 14 by a fixing base 13 connected to the gantry 2. It is accurately fixed to the bottom of the melting furnace 1 from above.

A plunger 9 is inserted into the main cylinder 10 and is connected to the hydraulic piston 7 via a coupling 8. When the hydraulic piston 7 lowers, the plunger 9 lowers, and the molten metal in the main cylinder 10 15 is pressurized and injected into the mold 4 from the injection cylinder 10a and the nozzle 11 to perform casting. The connection between the nozzle 11 and the injection cylinder 10a is made densely via the packing 12, and the holes 17 formed on the side surfaces of the main cylinder 10 allow the molten metal 15 to flow into and out of the main cylinder 10.

The details of the main cylinder 10 and the injection cylinder 10a constituting the pump of the present invention are separately shown in FIG. That is, the main cylinder 10 and the injection cylinder 10a in FIG. 2 are all the same ceramic (for example, silicon nitride).
And are integrally formed. Injection cylinder 10
The angle a is set in a range of 13 to 25 degrees with respect to the bottom surface of the main cylinder 10.

Further, the injection cylinder 10a protrudes linearly from the side surface of the main cylinder 10. The pump formed in this way is simple in shape and is the most desirable form. The height of the molten metal surface in the melting and holding furnace in which the pump is installed reaches the vicinity of the end of the nozzle hole of the injection cylinder 10a as shown in FIGS. It is necessary to supply hot water into the nozzle and to prevent outside air from entering the nozzle. However, the height of the molten metal cannot be higher than the end of the nozzle hole. Injection cylinder 1
The height and the angle of the molten metal surface determine the height level of the molten metal surface, and the main cylinder 10
Of the plunger to determine the height of the plunger required to inject the molten metal in the main cylinder 10 during casting and to maintain the molten metal under pressure for a certain period of time during casting.

Therefore, in order to take a sufficient plunger stroke, the length of the injection cylinder 10a or the angle must be increased. If the size becomes unnecessarily large and the angle is increased, the injection cylinder 10a and the main cylinder 10
The hardening of the ceramic powder at the connection portion with the ceramic powder is not sufficiently performed, so that the forming process becomes difficult, and cracks and the like frequently occur during firing, making it difficult to manufacture a stable ceramic pump.

Taking these relationships into consideration, it is preferable that the linear injection cylinder 10a having the above-described angle range is a preferable configuration in terms of manufacturing, use, and handling, including many practical examination results. It was confirmed that the plunger speed at the time of holding the plunger pressurized to the molten metal should be 50 mm / sec or less in the case of the present invention as described above. Based on this, the required stroke of the plunger was obtained. The length and angle of the injection cylinder were determined.

In other words, the above-described process effectively satisfies the efficient size of the melting and holding furnace, the moldability of the injection cylinder, the strength of the connection between the main cylinder and the injection cylinder, etc., and facilitates the molding. And the processing cost can be greatly reduced. In addition, the plunger stroke can be appropriately obtained, the molten metal does not leak during pressurization, and stable operation can be performed. Further, the quality of the product can be sufficiently improved by reducing the pressure loss in the injection cylinder 10a.

According to the present invention, instead of integrally molding the main cylinder 10 and the injection cylinder 10a as shown in FIG.
Can be connected using a packing. That is, by doing so, the stress at the connecting portion between the main cylinder 10 and the injection cylinder 10a can be further reduced, the strength can be improved, and the production can be simplified. By forming a step portion 10b at the connection portion and interposing a packing 10c, an effective connection with sufficient sealing performance is obtained, and it is also possible to appropriately replace when any one is damaged. Becomes

The present invention can be used not only for molten aluminum but also as a ceramic pump for injection of a hot metal die casting machine for other molten metals such as zinc and magnesium.

[0023]

[Effects of the Invention] According to the present invention as described above, the durability is excellent, the mechanical strength is large enough to withstand the tightening and crimping force with the mold, and the pressure loss is small and there is no metal leakage. This is a device which is industrially large in effect because it can provide a simple hot chamber die casting machine ceramic pump for injection at low cost and easily and can operate a preferable hot chamber die casting machine.

[Brief description of the drawings]

FIG. 1 is a sectional view of a ceramic pump according to the present invention and a hot chamber die casting machine using the same.

FIG. 2 is a sectional view of a main part of the ceramic pump in FIG.

FIG. 3 is a cross-sectional view of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Melting and holding furnace 2 Stand 3 Electric heater 4 Die 5 Die plate 6 Clamp 7 Hydraulic piston 8 Coupling 9 Plunger 10 Main cylinder 10a Injection cylinder 11 Nozzle 12 Packing 13 Fixed table 14 Bolt 15 Molten 17 hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Masato Saito 1-34-1 Kambara, Kambara-cho, Anbara-gun, Shizuoka Prefecture Inside Nikkei Giken Co., Ltd. 34-1 Nikkei Giken Co., Ltd. (72) Inventor Toshiyuki Kawai 1-34-1 Kambara-cho, Kambara-cho, Anbara-gun, Shizuoka Prefecture 1-34-1 Kambara, Nikkei Giken Co., Ltd. 6-1-1, Fujimi-shi, Pioneer Co., Ltd. (72) Inventor Keiichi Okada 6-1-1, Fujimi, Tsurugashima-shi, Saitama Pref. References JP-A-56-9054 (JP, A) JP-A-2-241650 (JP, A) JP-A-44-18913 (JP, Y1) JP-A-63-38069 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] The present invention is characterized in that a straight injection cylinder is provided at an inclination of 13 to 25 ° from a horizontal plane with respect to a horizontal plane from a main cylinder base having a plunger and within a range of a molten metal surface level in a melting and holding furnace. Ceramic pump for hot chamber die casting machine injection.