JPH0751271B2 - Molten metal forging method and equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in a molten metal forging method and apparatus for applying a pressure to the molten metal in a molding die to cast a high quality casting.

[0002]

2. Description of the Related Art As a typical existing molten metal forging method and apparatus, as shown in FIG. 5, a movable mold B is arranged so as to be vertically moved by a mold clamping cylinder C with respect to a fixed mold A, The movable mold B is moved upward to open the mold, and the injection chip E in the injection sleeve D is lowered by the injection cylinder F, and further in the injection sleeve D above the injection chip E, or in some cases, as a fixed mold. After pouring the molten metal into the mold of
The movable mold B is lowered by the mold clamping cylinder C to move both molds A,
B is clamped, the injection tip E is moved upward by the injection cylinder F, the molten metal in the injection sleeve D is filled in the cavity G, and strong pressure is applied to perform the molten metal forging.

Further, a hot water supply port is opened in the sleeve wall above the lowest position of the injection tip E in the injection sleeve D,
A means has also been proposed in which a predetermined amount of hot water is injected into the injection sleeve D above the injection tip D by the action of an electromagnetic pump, and then the steps after the mold clamping are performed.

In the molten metal forging method and apparatus as shown in FIG. 5, firstly, the molten metal is cast from bottom to top, and secondly, the movable mold and the fixed mold are arranged at fixed positions in the vertical direction. I have a problem with that.

That is, since the first casting is performed from the bottom to the top, the mold release agent is easily accumulated in the lower fixed mold A and the injection sleeve D, and the hot water is supplied from the injection tip E into the cavity G. There is a problem that it takes a relatively long time to inject hot water to the water.

Further, since the second molding die is arranged at a fixed position in the vertical direction, there is a problem that the setting direction of the placing core is restricted.

[0007]

DISCLOSURE OF THE INVENTION In view of the problems of the above-mentioned conventional typical molten metal forging method and apparatus, the present invention is directed to casting from the upper side to the lower side, and a quick and reliable sprue immediately after pouring. A mold of a movable mold at a position where it can be sealed and sprayed with a mold release agent that does not cause accumulation in the lower mold, selection of a free set core setting position, product removal by self-weight drop, etc. An object of the present invention is to provide a molten metal forging method and an apparatus that can perform opening.

[0008]

In order to solve the above-mentioned problems, in the invention of claim 1, the molten metal is poured from above into a molding recess of a molding mold in which a movable mold and a fixed mold are clamped.
Immediately after sliding the slide block on the gate of the mold for receiving pressure on the melt pressure, at least in two positions sandwiching the gate, crimping it to the outer surface of the mold on the pressure side for melt pressure to seal the gate,
The floor of the molten metal forging machine main body to which the movable mold and its driving mechanism, the fixed mold, the drive mechanism of the slide block, and the molten metal pressurizing mechanism in the molding recess are fixed while pressuring the molten metal in the molding recess. In addition, a means for rotating the fixed machine frame around a rotation axis to an inclined position which is a predetermined product take-out position, stopping the molten metal pressurization and opening the mold after stopping at the position is adopted.

Further, in the second aspect of the present invention, there is further provided means for stopping the rotation of the molten metal forging machine main body at a position suitable for the work such as spraying the release agent into the molding die and setting the placing core. Added.

In order to realize the above means smoothly, in the invention of claim 3, a molten metal forging device is provided with a lower mold as a movable mold, a lifting drive device therefor, and an upper mold as a fixed mold. The forging machine main body is supported by a rotary shaft located in any of the planes between the horizontal plane and the plane intersecting with the horizontal plane, and has a vertical position as a molten metal pouring position and an inclined position as a preparatory work position. The movable mold is provided with a pressure pin facing the molding recess and a pressure drive device for the movable mold, and the fixed mold has a gate that communicates with the molding recess from the top surface. A slide block that traverses the sprue and a drive device therefor are installed between the top surface portion and the molding recess, and a sprue intermediate portion that forms a part of the sprue is formed in the slide block. And the slide block is Reciprocating sliding is possible between two positions, a spout opening position where the spout intermediate part matches the spout, and a closing position where the spout and the spout intermediate part are closed to close the spout, and a fixed mold. When the slide block occupies the closed position at at least two positions sandwiching the sprue middle part between the upper wall of the slide block sliding hole and the top wall of the slide block, a strong pressure is generated in the slide block toward the forming recess. The engaging step portion is formed.

[0011]

[Operation] The lifting and lowering device, which is a mold clamping cylinder, is operated to clamp the fixed mold and the movable mold, and the mold is guided to an upper position including the vertical position, and the slide block is placed at the gate opening position and fixed. The molten metal is poured into the gate of the mold from above by a ladle, and then the slide block is slid to the closed position.

When the slide block occupies the closed position,
The slide block is brought into close contact with the lower wall of the slide block sliding hole of the fixed die, which is the molten metal pressure receiving side die, while the gate is closed by the engagement of the slide block sliding hole and the engaging step portion of the block. Leakage of hot water from the middle part is prevented.

Next, the pressure pin is advanced toward the molding recess by the operation of the pressure drive device, and pressure is applied to the molten metal in the molding recess.

When the pressurizing pin is operated, the molten metal forging machine main body is rotated from the vertical position, which is the molten metal injection position, to the inclined position, which is the preparatory work position, about the rotation axis.

After the time required for the molten metal to solidify has elapsed, the pressure of the pressure pin is released and the mold is opened.

The tilt position at which the body of the molten metal forging machine is rotated is selected to be a position suitable for preparation work such as taking out products, cleaning the molding die, spraying the release agent, and setting the stationary core. Therefore, these workability is improved.

After the completion of the various preparatory work, the molten metal forging machine body is again rotated to the vertical position which is the molten metal pouring position, and the above work is repeated.

[0018]

1 to 4 show an example of an embodiment of the invention of claim 3, in which the structure of the molten metal forging device is explained while referring to the drawings of the inventions of claims 1 and 2. Clarify the structure of the method.

In FIG. 1, a molten metal forging machine main body 1 is provided with a lower die as a movable die 2, a die clamping cylinder as an ascending / descending drive device 3 and an upper die as a fixed die 4.

The molten metal forging machine main body 1 is fixed to a machine frame 5 fixed on the floor side by a rotatable shaft 6 which is rotatable.

In the illustrated example, the rotary shaft 6 is arranged in a horizontal plane, but the arrangement direction thereof is inclined in any plane between the horizontal plane and a plane oblique to the horizontal plane. May be provided.

In the illustrated example, a sprocket wheel 7 is fixed to the rotary shaft 6 and a drive motor 8 fixed to the machine frame 5.
Sprocket wheel 10 fixed to the output shaft 9 of the
The chain 11 is stretched between the and, and the molten metal forging machine body 1 is rotated as described above.

As will be described later, the turning range of the molten metal forging machine main body 1 is a vertical position where the main body is located in a vertical plane, which is the position where the molten metal is injected into the molding die, and is rotated by a predetermined angle from the vertical position. It is set between two positions, that is, a tilt position which is a preparation work position.

The movable mold 2 has a pressure pin 13 facing the molding recess 12 and a pressure cylinder 15 as a pressure drive device 14.
And a pressure piston 16 are incorporated. In the figure, the supply / discharge mechanism for the pressurized fluid is omitted.

The fixed mold 4 is provided with a spout 19 for injecting molten metal, which communicates with the molding recess 18 from the top surface portion 17.

Further, in the fixed mold 4, a slide block sliding hole 20 which crosses the sprue 19 and is parallel to the top surface portion 17 is provided between the top surface portion 17 and the molding concave portion 18. The slide block 21 is reciprocally slidably inserted into the drive cylinder and is connected to a drive cylinder that is a drive device 22.

The slide block 21 is provided with a sprue 19
1 is formed, and the slide block 21 has, as shown in FIG. 1, a spout opening position in which the sprue intermediate part 23 matches the sprue 19 and communicates the sprue 19 in series. As shown in FIG. 2, the sprue middle part 23
And the sprue 19 and the closed position where the sprue 19 is closed by the drive device 22.

The upper wall 2 of the slide block sliding hole 20
4, the driving device 22 side occupies a high position, and the step portion 2 is diagonally downward.
5, the intermediate portion 26 is connected to the slightly lower intermediate portion 26, and the intermediate portion 26 is connected to the opening end by a step portion 27 that is obliquely downward. In the illustrated example, the step portion 25 and the step portion 27 sandwich the sprue 19 before and after 2
It is provided in the position.

When the closed position is occupied, the top wall 28 of the slide block 21 engages with the step portion 25 and the step portion 27 of the slide block sliding hole 20 and receives a strong pressure toward the molding recess 18. Inclined step portions 29 and 30 are formed.

The above-mentioned steps 25 and 27 and the inclined steps 29 and 3
The lower surface 31 of the slide block 21 is brought into close contact with the lower wall 32 of the slide block sliding hole 20 of the fixed die 4, which is the molten metal pressure receiving side die, by the engagement with 0 and the pushing force of the drive device 22, and slides. The molten metal is prevented from leaking into the block sliding hole 20.

The method according to the invention of claims 1 and 2 is carried out as follows by the molten metal forging device shown in FIG.

As shown in FIG. 1, a molten metal forging machine body 1
Is set to a vertical position as a molten metal pouring position, and a movable mold 2 and a fixed mold 4 are driven by an elevation drive position 3 as a mold clamping cylinder.
And die are tightly attached to each other, the slide block 21 is set to the spout opening position, and the sprue 19 communicating with the molding recesses 12 and 18 is formed.
The molten metal is poured from the helldle 33.

Next, as shown in FIG. 2, the slide block 21 is slid to the closed position for closing the sprue 19 by the drive unit 22, and the step portions 25 and 27 and the inclined step portions 29 and 3 are moved.
The sprue 19 is sealed by engaging with 0.

At this stage, the drive motor 8 is operated to rotate from the vertical position, which is the molten metal pouring position, to the inclined position, which is the preparatory work position, and the pressurizing drive device 14 is also operated.
Pressure is applied to the molten metal in the molding recesses 12 and 18 by the pressure pin 13.

In FIG. 3, the pressurizing piston 16 of the pressurizing drive unit 14 is raised by a height H, and the pressurizing pin 13 pressurizes the molten metal in the forming recesses 12 and 18 with pressure. The machine body 1 is in a state just before the start of rotation.

The molten metal forging machine main body 1 is rotated to an inclined position which is a preparation work position and stopped, and after the required time for solidification of the molten metal elapses, the pressing pin 13 is lowered by the pressing drive device 14 to release the pressing force. Then, the movable mold 2 is lowered by the lifting drive device 3 as a mold clamping cylinder to open the mold.

FIG. 4 shows a state in which the molten metal forging machine main body 1 is rotated from the vertical position by an angle of 90 degrees to occupy a horizontal preparatory work position, that is, an inclined position, and the movable mold 2 occupies the lowermost position. ing.

From the state shown in FIG. 3, the pressurizing piston 16 of the pressurizing drive device 14 is lifted again, and the product 34
Is extruded from the molding recess 13 of the movable mold 2 and spontaneously falls by its own weight, and the product removal is completed.

Next, the slide block 21 is returned to the sprue opening position, the movable mold 2 and the fixed mold 4 are cleaned, the release agent is applied, and the set core is set. The main body 1 is returned to the vertical position shown in FIG. 1 again, and the molten metal injection operation is repeated.

In the embodiment described above, with the molten metal forging machine main body 1 occupying the inclined position which is the preparatory work position, the product is taken out, the molding die is cleaned, the release agent is applied, the set core is set, etc. However, the so-called preparatory work from the removal position of the product and the cleaning of the molding die to the setting of the placing core is performed by turning the molten metal forging machine main body to the inclined position which is the second preparatory work position with good workability. It is the invention of claim 2 that is performed by moving.

In the illustrated example, the rotary shaft 6 is horizontally arranged. However, when the rotary shaft is arranged so as to be inclined with respect to the horizontal plane, the molten metal flows into the molding concave portion of the molding die obliquely upward. It is carried out from, and the degassing becomes good. That is, the rotation axis may be located in any plane between the horizontal plane and the plane oblique to the horizontal plane.

In the case of the illustrated embodiment, the molten metal forging machine is stopped at a vertical position, which is a molten metal pouring position, to be poured, and pressure is applied by a pressure pin while rotating to a tilt position, which is a preparatory work position. However, it is needless to say that this may be performed by pouring the molten metal, closing the gate with the slide block, and pressurizing with the pressure pin while rotating from the vertical position to the inclined position.

Further, in the illustrated embodiment, the turning angle from the vertical position to the inclined position of the molten metal forging machine main body is 90 degrees, but the turning angle is not limited to 90 degrees.

Further, in the illustrated embodiment, the product is taken out at the inclined position which is the preparatory work position by spontaneously dropping the product by its own weight, but it may be positively carried out by attaching another pushing cylinder. .

The rotating device of the molten metal forging machine main body 1 is not limited to the one shown in the drawing, and any device can be used, and an engaging structure for generating a strong pressure on the slide block 21 toward the forming recess. Is not limited to the illustrated example.

[0046]

According to the first aspect of the present invention, the molten metal can be supplied into the molding concave portion of the molding die which has been clamped in advance by flowing downward, and the gate can be closed only by sliding the slide block. Since it can be performed immediately after pouring, the pouring and sealing of the sprue can be performed quickly, and work efficiency is significantly improved.

Further, since the molten metal forging machine main body is rotated to a convenient inclined position for taking out the product, the product can be taken out by a natural drop, and the working time can be shortened.

Since the molding die is clamped in advance, it is possible to immediately close the sprue and pressurize the hot water in the molding recess after pouring.
In addition to the fact that the temperature drop is small and the molten metal can be directly injected into the molding concave portion or the molten metal pool in the vicinity thereof, the entrainment of the solidified layer can be reduced.

According to the second aspect of the present invention, the preparation work such as cleaning of the molding die, application of the release agent, and setting of the set core is performed by placing the molten metal forging machine main body at a position convenient for these various operations. Since it can be rotated and performed at an inclined position, the release agent does not accumulate in the molding die, and the degree of freedom in the placement of the placing core is increased, and the workability can be significantly improved.

According to the invention of claim 3, the inventions of claims 1 and 2 can be implemented with a relatively simple mechanism, a product take-out machine is not required, and an increase in incidental equipment and an increase in installation area are small. In addition to being able to do so, there is an effect that the work efficiency can be remarkably improved.

Further, since it is not necessary to provide a molten metal pool at the bottom of the molten metal forging machine, there is an effect that the design restrictions on cooling facilities such as equipment and products can be eliminated.

Since the sprue opens above the molding recess, and the pressure pin facing the molding recess is arranged at a position opposite to the sprue,
Since the sprue can be exposed by exposing the sprue to the outside, it also has an effect of preventing a decrease in hot water temperature during pouring.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view showing a state immediately before pouring molten metal in an example of implementing the invention of claim 3;

FIG. 2 is a vertical sectional front view showing the spout closed state of the one shown in FIG.

FIG. 3 is a vertical cross-sectional front view showing a state in which pressure is applied to a molding recess from the state shown in FIG.

FIG. 4 is a cross-sectional plan view showing a state where the one shown in FIG. 1 is rotated to an inclined position which is a work preparation position and the mold is opened.

FIG. 5 is a vertical sectional front view of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molten metal forging machine main body 2 Movable die 3 Elevating drive device 4 Fixed die 6 Rotating shaft 12,18 Forming concave portion 13 Pressing pin 14 Pressurizing drive device 17 Top surface portion 19 Gate 20 Sliding block sliding hole 21 Sliding block 22 Drive device 23 Gate intermediate part 24 Upper wall 25, 27 Step part forming an engaging part 28 Top wall 29, 30 Inclined step part forming an engaging part

Claims (3)

[Claims] 1. A molten metal is poured from above into a molding concave portion of a molding die in which a movable die and a fixed die are clamped in advance, and immediately a slide block is slid to close the gate of the die for receiving the melt pressure. Then, at least at two positions sandwiching the gate, the molten metal pressure receiving side mold is pressure-bonded to the outer surface of the mold to seal the gate, and then the movable mold and its driving mechanism are pressed while pressurizing the melt in the molding recess.
The fixed die, the drive mechanism of the slide block, and the molten metal forging machine main body to which the pressurizing mechanism of the molten metal in the forming recess is fixed, and the tilt that is the predetermined product take-out position around the rotation axis of the machine frame fixed to the floor side. A molten metal forging method, which comprises rotating to a position, stopping the pressing to the position, and then stopping the pressing of the molten metal and opening the mold. 2. The rotation of the molten metal forging machine main body is stopped at a position suitable for operations such as spraying a mold release agent into a molding die, setting a set core, and the like. Molten metal forging method. 3. A molten metal forging machine main body to which a lower mold which is a movable mold, an elevating and lowering drive device for the movable mold, and an upper mold which is a fixed mold are mounted is located between a horizontal plane and a plane oblique to the horizontal plane. The vertical position, which is a molten metal pouring position, and the tilt position, which is a preparatory work position, are supported by a rotary shaft located in the plane.
The movable mold includes a pressure pin facing the molding concave portion and a pressure drive device for the pressure pin.
The fixed mold is provided with a sprue communicating from the top surface portion to the molding recess, and a slide block that traverses the sprue and a driving device for the slide block are installed between the top surface portion and the molding recess. The slide block is formed with a sprue intermediate part forming a part of the sprue, and the slide block is
While being reciprocally slidable between two positions, a spout opening position in which the spout intermediate part matches the spout, and a closed position in which the spout and the spout intermediate part are closed to close the sprue,
When the slide block occupies the closed position in at least two positions sandwiching the sprue middle part between the upper wall of the slide block sliding hole of the fixed mold and the top wall of the slide block,
A molten metal forging device in which an engaging step portion for generating a strong pressure toward a forming recess is formed in a slide block.