JPH07314121A - Method and device for composite casting of dissimilar metal using lost foam pattern casting method - Google Patents

Abstract

PURPOSE:To provide a method and a device for composite casting of dissimilar metals using a lost foam pattern casting method capable of two dimensions (plane) or three dimensions (cubic) of dissimilar metals in one process at a low cost. CONSTITUTION:A casting plan 1 where a composite stock of arbitrary metal is joined to a lost foam pattern made of a foamable resin, a sprue made of ceramics tube is faced to one side of the lost foam pattern part, and a riser made of heat insulating material is loaded on the upper surface, is placed in a flask 7 related to a three dimensional exciting device 8 and connected to a vacuum evacuating device 9, and the spread into the details of a mold made of a refractory 6 is promoted by providing the vibration in the X, Y, Z directions after being coated and embedded with the refractory 6. In the condition where the flask 7 is evacuated to the prescribed degree of vacuum, the substitute metal which is separately melted and controlled to an appropriate temperature is poured from the sprue made of ceramics, and the gas generated in the substitution process is discharged out of the flask through the riser. When the substitution of the lost foam pattern part is completed and the cooling is executed, the evacuation is stopped, and the sprue made of ceramics and the riser are cut.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite casting method for dissimilar metals using a vanishing model casting method, and its equipment, for example, a composite technology of a general cast iron material, aluminum, copper or their alloys, and a high-grade metal. Regarding

[0002]

2. Description of the Related Art Generally, in order to combine different kinds of metals, respective parts are manufactured from each metal and then joined by welding, brazing, pressure welding or the like. That is, each of them was once melted, rolled, drawn, etc., cooled, and then heated again to be joined. Therefore, the number of steps is increased and the energy loss is large, and it is extremely difficult to manufacture a complicated shape. According to the knowledge of the present inventors, a dissimilar metal is two-dimensional (plane) or three-dimensional (three-dimensional) in one process.
So far, there is no technology to combine at low cost.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of such a situation, and a new technique (plan, device, system) is added to the process of the vanishing model casting method that has been implemented so far. The present invention provides a method and an apparatus for inexpensively compounding different kinds of metals in a two-dimensional (plane) or three-dimensional (three-dimensional) state by incorporating them in one step.

[0004]

Means for Solving the Problems In order to achieve the above object, the present invention is to join a vanishing model made of expandable synthetic resin with an arbitrary metal-compositing material, and provide a pottery sprue on one side of the vanishing model. A casting method is produced by placing a feeder cylinder made of a heat insulating material on the upper surface while facing it (molding of a model). Then, this casting method is placed in a flask which is associated with a three-dimensional vibrating device and connected to a vacuum suction device, covered with a refractory and buried, and then vibrated with a predetermined strength and time in the X, Y and Z directions. Is added to promote the detailed spread of the refractory mold (mold completion). Then, in a state where the inside of the flask was depressurized to a predetermined degree of vacuum, a substitution metal separately melted and controlled at an appropriate casting temperature was poured into the mold through the porcelain sprue and the gas generated in the substitution process was pushed. It is discharged from the flask through the hot water tank, and the vacuum is released when the replacement of the disappearing model part is completed and cooling is completed. Finally, it is a composite casting method for dissimilar metals using the vanishing model casting method, which is obtained by cutting off the pottery tube and the feeder tube.

Further, an arbitrary metal composite material 2 is joined to a disappearing model 3 made of a foaming synthetic resin, a ceramic pipe spout 4 is faced to one side of the disappearing model 3, and a feeder cylinder made of a heat insulating material is provided on the upper surface. The casting method 1 including 5 mounted thereon, and the casting method 1 were placed in a stationary state, covered with a refractory material 6, buried, and further associated with a vibrating device 8 and a vacuum suction device 9 for imparting three-dimensional vibration. A composite of dissimilar metals using a vanishing model casting method, which is composed of a flask 7 and a product is obtained by pouring a replacement metal separately melted under a reduced pressure in the flask 7 and controlled to an appropriate casting temperature It is an apparatus used for carrying out the casting method.

[0006]

EXAMPLES A composite casting method for dissimilar metals using the vanishing model casting method of the present invention will be described below with reference to an apparatus used for carrying out the method. First, in FIG. 2, 1 is a casting method according to the present invention, in which an arbitrary metal composite material 2 is joined to a vanishing model 3 made of expanded polystyrene, and a pottery sprue 4 is faced to one side of the vanishing model 3. A feeder cylinder 5 made of a heat insulating material is placed on the upper surface of the vanishing model 3. In FIG. 1, reference numeral 7 is a flask for placing the casting method 1 in place, covering it with a refractory material 6 and burying it therein. The flask 7 is placed and fixed on an oscillating device 8 which gives three-dimensional vibration, and a vacuum suction device (vacuum pump). ) 9 is connected. That is, when the casting method 1 is placed in the flask 7 and covered with the refractory material 6 and buried therein, vibration of predetermined strength and time is applied in the X, Y and Z directions to spread the refractory material in detail. The mechanism is such that the inside of the flask 7 can be kept in a depressurized state by urging the vacuum suction device 9 to start. The flask 7 must be kept airtight, and therefore the upper surface is sealed with a seal 7a,
In the later pouring, the portion communicating with the pot 4 is melted and opened.

Then, a replacement metal, which is separately melted by a melting system (not shown) and controlled at an appropriate pouring temperature, is poured into the mold in a depressurized state through the above-mentioned pottery tube spout 4 and generated in the replacement process. The generated gas is discharged to the outside of the flask 7 through the feeder cylinder 5, and the vacuum is released when the replacement of the vanishing model portion 3 is completed and the cooling is completed. At the time of the pouring, the funnel 10 is inserted into the pouring port 4 of the pottery tube. Finally, the pottery bath 4 and the feeder cylinder 5 are cut off to obtain a composite casting product of a dissimilar metal having an integral structure. In FIG. 1, 11 is a machine frame, 12 is a vacuum pump constituting the vacuum suction device 9, and 1 is a vacuum pump.
3 is also a storage tank, 14 is a raw material hopper, 1
Reference numeral 5 is a molten metal carrying hoist, and 16 is a control device.

[0008]

[Experimental Example] Using the apparatus of the present invention, the following experiment was conducted in order to obtain a composite material of flake graphite cast iron and stainless steel.
First, as a casting method 1, stainless steel as a metal composite material 2 is joined to a vanishing model 3 made of expanded polystyrene, a pottery sprue 4 is faced to one side of the vanishing model 3, and a heat-resistant slush is placed on the upper surface of the vanishing model 3. -Place the tub (the feeder cylinder 5) (Fig. 2). Then, this casting method 1 is placed in a flask 7 shown in FIG. 1, covered with a refractory material 6 and buried therein, and then a three-dimensional vibration oscillating device 8 is operated to give a predetermined strength and time in the X, Y and Z directions. Vibration of the refractory material is prompted to spread the details of the mold of the refractory material, and then the vacuum suction device 9 is started to keep the inside of the flask 7 in a predetermined depressurized state. Then, the funnel 10 is inserted into the porcelain sprue spout 4 from above the upper surface sealing seal 7a which keeps the flask 7 airtight, and the seal 7a portion corresponding to the porcelain spout 4 is melted and opened by the subsequent pouring. Put it in a state where

Then, a flake graphite cast iron melted separately by a melting system (not shown) and controlled at an appropriate pouring temperature is poured into the mold in a depressurized state from the pottery gate 4 (this is done). It has been described above that the seal 7a corresponding to the pottery gate 4 is melted and opened). The gas generated in this replacement process is discharged to the outside of the flask 7 through the heat resistant sleeve (the feeder cylinder 5), and the vacuum is released when the replacement of the disappeared model portion 3 is completed and cooled. And finally, the pottery bath 4
Then, the feeder cylinder 5 is cut off to obtain a composite material of flake graphite cast iron and stainless steel having an integral structure.

The experimental results of this composite material are as follows. The composite material and the base material are almost completely bonded to each other and have no internal defects. Further, the structure changes depending on the casting temperature. When the casting temperature is high, the joining condition is good, and a fine compound is generated at the joint. The composite material (SUS420J2) itself is hardened and hardened.
The hardness shows the same tendency as the result of the tissue test. In other words, the joining base material (FC part) has a hard layer of about 300 μm, the composite material also hardens about 3000 μm, and the maximum hardness is 800 HV0.1.
That is all (Fig. 3). Regarding the shear load, both the coated type and the uncoated type did not break at the maximum load of 98,000 N of the equipment, and when compounded, the strength was much higher than that of the base material, and a shear strength of about 2 times or more can be expected (Fig. 5 , FIG. 6). In the split test, the maximum load and deflection of the composite part are about 2 to 4 times as strong as the base metal and about 2 to 3 times.
It has twice the deflection (Figs. 7 and 8). Furthermore, the fatigue limit (bending) improves dramatically when compounded, and the compounded part is about 570 N / mm ² and the base metal part is about 3 for both high temperature and low temperature casting.
The fatigue limit of 30 N / mm ² was improved by 1.5 to 1.7 times (Figs. 9 and 10). On the other hand, in the case of low temperature casting, only the joint portion is hardened, the FC portion immediately becomes the hardness of the base material, and the hardness of the composite material portion is slightly increased (Fig. 4). Further, in the splitting and fatigue tests, the shear load was lower than that of the base material, although the properties did not deteriorate so much.

[0011]

As described above, the present invention provides the following advantages. (A) The composite material and the base material (substitution metal) are bonded in a nearly perfect state due to the high casting temperature, and a fine compound is generated at the joint. The composite material itself is hardened and hardened. Since the upper mold and the lower mold are not separated, it is possible to form an integrated structure having no parting surface. As a result, burrs and penetration do not occur after complexing different kinds of metals, and the finishing process can be omitted, so that significant cost reduction can be expected. (B) Since it is compounded under reduced pressure, the gas content is reduced,
Protected from oxidation and contamination, it can be commercialized with only a relatively slight polishing. (C) Energy saving and resource saving and no cost increase because they are compounded by the melting energy of the substituted metal. (D) By using the vanishing model, it is possible to flexibly deal with complicated shapes, and there is a high degree of freedom in compounding two or more kinds of metals. (E) As a result of the effects of (a) to (d), highly practical metal-based composite materials are applied to various industries, particularly materials requiring heat resistance, corrosion resistance, and wear resistance, and fields requiring parts. Can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the device of the present invention.

FIG. 2 is a perspective view of a casting method according to the present invention.

FIG. 3 is a graph showing a hardness transition curve of a composite material.

FIG. 4 is a graph showing a hardness transition curve of a composite material.

FIG. 5 is a graph showing the results of a shear test of the composite part.

FIG. 6 is a graph showing the results of the shear test of the base material.

FIG. 7 is a graph showing the splitting test result of the composite part.

FIG. 8 is a graph showing the splitting test result of the base metal part.

FIG. 9 is a graph showing the fatigue test result of the composite part.

FIG. 10 is a graph showing a fatigue test result of a base metal part.

[Explanation of symbols]

 1 Casting plan 2 Arbitrary metal compounding material 3 Disappearance model part made of expandable synthetic resin 4 Pottery sprue gate 5 Riser 6 Refractory 7 Flask 8 Three-dimensional vibration device 9 Vacuum suction device

Claims (2)

[Claims] 1. An arbitrary metal composite material is joined to a vanishing model made of expandable synthetic resin, a pottery gate is exposed on one side of the vanishing model portion, and a feeder cylinder made of a heat insulating material is placed on the upper surface. Then, a casting method is manufactured, and the casting method is placed in a flask which is associated with a three-dimensional vibrating device and connected to a vacuum suction device, covered with a refractory material, and buried, and then in the X, Y, and Z directions. Propagating the mold details of the refractory by applying vibration of a predetermined strength and time, then, in a state where the inside of the flask is depressurized to a predetermined degree of vacuum, a substitution metal separately melted and controlled to an appropriate casting temperature. Is poured into the mold from the ceramic tube spout, the gas generated in the replacement process is discharged to the outside of the flask through the feeder cylinder, and the vacuum is released when the replacement of the disappeared model portion is completed and cooled, and finally Characterized by excising pottery baths and feeders A composite casting method for dissimilar metals using the vanishing model casting method. 2. A vanishing model portion (3) made of expandable synthetic resin.
An arbitrary metal composite material (2) is joined to the above, the pottery tube spout (4) is faced to one side of the vanishing model portion (3), and a feeder tube (5) made of a heat insulating material is placed on the upper surface. And a vacuum suction device (9) for placing a casting plan (1) on the casting plan (1), encasing the casting plan (1), covering and burying it with a refractory (6), and further applying three-dimensional vibration Disappearance model casting method, which comprises a flask (7) associated with the above, and obtains a product by pouring a replacement metal separately melted under a reduced pressure in the flask (7) and controlled to an appropriate casting temperature. An apparatus used for carrying out a composite casting method for dissimilar metals using a.