JP4412520B2 - Molten metal injection equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of an apparatus for melting metal and pouring molten metal into a mold in a precision casting machine used for dentistry and the like.
[0002]
[Prior art]
FIG. 4 shows the structure of a conventional apparatus, and the conventional structure will be described with reference to FIG. 4a is a side sectional view and FIG. 4b is a plan view. The A side shows a state where a crucible described later is closed, and the B side shows a state where the crucible is opened. It is composed of a melting chamber 1 and a casting chamber 2 and is sealed with an O-ring 20, and is sealed with a chamber cover (not shown) on the melting chamber 1 to depressurize or pressurize them. And the sight glass is inserted in the upper part. The molten metal in the crucible is dropped into the sprue 2a and further cast into the mold 7 by pressurizing with an inert gas. Generally, an alloy used for this type of precision casting has a quantity of several grams. A small amount of tens of grams. Therefore, the crucible 10 is divided into two parts, that is, a crucible piece 10a and 10b. The crucible 10 is formed by pressing the outer peripheral upper surface of the flange 11 of the crucible with the tip 22 of the crucible opening / closing body 21 so that the divided surfaces 15 coincide with each other. , Contains the metal to be melted. When the high frequency power supplied to the high frequency coil 19 melts the molten metal by induction heating and drops the molten metal from the crucible bottom 12, the crucible is opened with the following structure. In order for the front end 22 of the crucible opening / closing body to release the pressure, first, the whole is U-shaped, and the width from the wide restraining portion 30a of the opening / closing arm 30 that can slide horizontally on the crucible support 18 is increased. By sliding the open / close arm to the narrow open portion 30b and utilizing the component force, the spring 28 advances the flange fixing portion 23 inward and pushes the flange outer edge. The crucible with the flange outer edge pushed is opened from the crucible bottom 12 in a wedge shape with the upper end of the dividing surface as a fulcrum by the action of the lever, and the molten metal is about to fall instantly.
[0003]
[Problems to be solved by the invention]
When there is a large amount of molten metal, when the molten metal is pressurized with an inert gas for pressure casting, the sudden melting of the molten metal strongly collides with the inner wall of the crucible, causing turbulent flow, and the molten metal is scattered on top. To do. The scattered metal fine powder adheres and becomes dirty on the lower surface of the observation window glass for direct observation or sensor detection provided on the chamber cover sealed on the melting chamber 1 surrounding the crucible 10 and the high frequency coil 19. There was a drawback that the crucible could not be monitored. In addition, since the crucible opening / closing body is switched between vertical rotation and reciprocation by the component force of the arm width change part, there is a problem that the engagement part is heavily worn and troubles such as catching are likely to occur. It was. It is an object of the present invention to provide a molten metal injection apparatus that eliminates these disadvantages.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, a pair of crucibles are formed in the upper part of the flange and a pair of crucibles provided with flanges on the outside of the edge of the opening of each divided part in the shape of a container opened upward. A melting chamber sealed with a chamber cover that houses a notch portion that forms an inverted triangle when the pair of crucible dividing surfaces are closed and a high-frequency coil that surrounds the crucible in a cylindrical shape and is provided with a viewing window on the top surface; A casting chamber containing a mold into which the molten metal flowing out from the bottom of the crucible is poured, and a fixed support for supporting the flange of the crucible in the melting chamber with the lower surface of the flange of the crucible as a support point ; a horizontal portion that is biased in a direction to closing constraining the crucible in contact with the pair of crucible by the force of the spring, the horizontal portion, a vertical portion for tilting about an axis to form the tip is pressed down A movable support, a rod that presses the vertical portion of the movable support when moved in the horizontal direction, and tilts the horizontal portion of the movable support against the force of the spring, and drives the rod Rod driving means for moving the rod in the horizontal direction by the rod driving means and pressing the vertical portion of the movable support so that the horizontal portion of the movable support is When the crucible is released by inclining against the crucible, the movable support is supported with the support point of the fixed support suspended from the crucible and the top of the inverted triangle of the notch as a fulcrum. is configured to open by the displacement of said crucible own weight depending on the bottom wedge, the crucible is set taking into the crucible to be melted metal while restraining closure, open wedge-shaped the crucible from the bottom In the state In the molten metal injection apparatus for injecting the molten metal in the crucible into the mold, the apparatus includes a flange pressing tool having a wedge-shaped convex portion corresponding to the notch, and when the molten metal is injected into the mold, When the tool is pulled up from the upper surface of the crucible and the metal to be melted is set in the crucible, the flange pressing member is pressed from above the crucible flange, and the wedge-shaped convex portion of the flange pressing tool is fitted into the notch. The crucible was guided to an appropriate position. Therefore, when the flange holder presses the upper surface of the crucible from above, the flange slides on the flat surface, finely adjusts the horizontal surface, guides it to an appropriate position, and serves as an automatic return device for the crucible position after the molten metal flows out. It was possible to have a function.
[0005]
With respect to the second aspect, the horizontal portion of the movable support is disposed at a position where it abuts immediately below the flange of the crucible.
[0006]
With respect to the third aspect, the pair of movable supports abut on the lower side surface of the crucible, and the crucible is constrained by the force of the spring so as not to open in a wedge shape from the bottom. When the rod is driven by a force that opposes the spring of the movable support, the contact is retracted on the lower side of the crucible and the restraint is released. Since the crucible tends to return to the free position with the support portion suspended by the fixed support as a fulcrum, the flange surface can be tilted on both sides to the retracted position of the movable support and can be opened from the crucible bottom.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a side view obtained by rotating the side view of FIG. 1 by 90 degrees. In FIG. 1, the A side shows a state where the crucible is closed, and the B side shows a state of the movable support body where the crucible is opened. The C side of FIG. 2 shows the state of the movable support body in which the crucible is open, and the D side of FIG. 2 shows the state of the movable support body in which the crucible is closed. The melting chamber 1 for heating the crucible 10 is combined with the casting chamber 2 and sealed with an O-ring 20. In the upper part of the melting chamber 1, a pair of convex fixed support bodies 3 are provided from a crucible support frame 18 opened in a wide-mouth shape, and the crucible 10 is suspended from the lower surface of the flange 11 of the crucible. . Above the melting chamber 1, a chamber cover 8 having a viewing window glass 9 is sealed with an O-ring 26 and sealed. A lower part of the melting chamber 1 is provided with a shape in which a high-frequency coil 19 surrounds the crucible 10. When high-frequency power for heating is supplied to the high-frequency coil 19, the metal to be melted in the crucible 10 is heated and melted. As shown in FIG. 2, the crucible 10 includes a crucible piece 10 a and a crucible piece 10 b that are vertically divided from the dividing surface 15. A pair of movable support bodies 4 that support the flange portion 13 of the crucible 10 are provided on the same plane as the pair of fixed support bodies 3 at substantially orthogonal positions. The shape of the movable support 4 is a shape obtained by bending a seesaw. The movable support 4 is composed of a horizontal portion and a vertical portion. When the rod 6 presses the vertical portion, the horizontal portion of the movable support becomes the force of the spring 5 indicated by an arrow. Since the tip of the crucible 10 is tilted so that the tip is pushed down, the restrained state of the lower portion 13 of the flange 10 of the crucible 10 is released, and the crucible is in the state of B side in FIG. 1 (C side in FIG. 2). When the pressing of the rod 6 is released, the force of the spring 5 overcomes and the movable support body returns to the horizontal state from the inclination and puts the crucible flange immediately below 13 in a restrained state as shown in the state of the A side.
[0008]
The rod driving means 61 is an electromagnet, and presses the rod 6 directly connected to the movable iron core 62 of the electromagnet in the arrow direction on the B side. However, when the current value energized to the coil of the electromagnet is lowered, the spring force overcomes the electromagnet and A The rod 6 returns to the original side. In this way, the state in which the force of the spring 5 returns the horizontal portion of the movable support 4 to the original state closes the crucible piece 10a and the crucible piece 10b, but energizes the coil of the electromagnet of the rod driving means 61 and When the rod 6 is pressed so as to overcome the force, the movable support 4 tilts in the direction in which the crucible 10 is released from restraint. Even if the rod driving means 61 is an air cylinder, the same function is exhibited, which is effective.
[0009]
Next, the relationship between the opening and closing of the crucible 10 and the molten metal will be described. With the crucible piece 10a and the crucible piece 10b being closed by the force of the spring 5, the metal to be melted is put into the crucible 10 and the chamber cover 8 Is closed, the air in the melting chamber 1 and the casting chamber 2 is replaced with an inert gas, and high frequency power is supplied to the high frequency coil 19 to heat and melt the metal to be melted. Next, in order to overcome the force of the spring 5 and press the rod 6, the electromagnet of the rod driving means is energized, and the tip of the horizontal portion of the movable support 4 is inclined downward, and the force that presses the flange directly below the crucible 10. When released, the molten metal gravity and the dead weight of the crucible 10 open a wedge shape from the lower part 12 of the crucible and the molten metal falls from the lower part 12 of the crucible and passes through the gate 2a of the casting chamber 2. It is cast with a mold 7. The driving means 61 is balanced with the force of the spring 5 so that the opening speed of the lower part 12 of the crucible becomes gentle so that the molten metal falls at this time and the turbulent flow does not occur in the crucible. Increase or decrease the value of current flowing through the electromagnet. This allows the crucible to be opened and closed freely.
[0010]
In the present invention, as shown in FIG. 2, a flange pressing member 31 is provided so as to have a function as an automatic return device for the crucible position after the molten metal has flowed out. The flange retainer 31 having a wedge-shaped convex shape corresponding to the wedge-shaped notch of the flange is pulled up above the upper surface of the crucible when dropping the molten metal, but the molten metal is set in the crucible. When pressing, hold the crucible flange from above as shown by the arrow in FIG. At this time, the wedge-shaped convex portion serves as a guide, and the flange slides on the plane, finely adjusts on the horizontal plane and fits into the notch, and guides the crucible 10 to an appropriate position. In the above description, as shown in FIGS. 1 and 2, the crucible is set at a position where the notch portion 14 of the crucible is directly above the movable support 4.
[0011]
According to a third aspect of the present invention, the movable support is disposed so that the contact portion of the movable support body with the crucible is the lower side surface of the crucible. A restrained state in which the crucible pieces 10a and 10b are closed and integrated and supported by sandwiching the crucible pieces 10a and 10b from a pair of opposing positions, and a non-restrained state in which the crucible is released in a wedge shape from the lower part by releasing the support at the abutting and retreating position. This is realized by the position of the rod 6.
[0012]
【The invention's effect】
Since the bottom opening of the crucible can be freely opened and closed while adjusting the amount of molten metal falling, the molten metal falls from the bottom of the crucible in the container-like vertically divided crucible opened upward. When we did this, we were able to slow down the fall to such an extent that the molten metal did not scatter up to the sight glass provided above. Furthermore, the wear at the engagement portion caused by the switching of the vertical rotation and reciprocation by the component force of the arm width change portion, such as a crucible opening / closing body for opening the crucible bottom, has been conventionally performed. However, it was possible to solve this problem with a simple and clear crucible opening / closing structure. According to the present invention, since electrical control can be performed as described above, it is possible to eliminate the occurrence of conventional window glass fouling, adjust the degree of opening while recognizing the inside of the crucible, and eliminate casting defects. In conjunction with the crucible recognition, the heating power can be controlled, contributing to energy saving. In addition, the cause of wear and catching of the conventional crucible opening / closing body is eliminated, and the reliability and maintenance during operation are greatly improved, resulting in an economical device, which has great industrial value.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing the structure of a molten metal injection apparatus showing an embodiment of the present invention.
FIG. 2 is a side view of FIG.
FIG. 3 is a longitudinal sectional view of a molten metal injection apparatus showing another embodiment of the present invention.
FIG. 4 shows the structure of a conventional molten metal injection apparatus, in which a is a longitudinal sectional view and b is a plan view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Melting chamber 2 Casting chamber 2a Gate 3 Fixed support body 4 Movable support body 5 Spring 6 Rod 61 Rod drive means 7 Mold 8 Chamber cover 9 Viewing window glass 10 Crucible 10a Crucible piece 10b Crucible piece 11 Flange 12 Crucible bottom 13 Flange just below the flange 14 Notch 15 Dividing surface 18 Crucible support frame 19 High-frequency coil 20 O-ring 26 O-ring 31 Flange retainer 62 Movable iron core

Claims (3)

The upper part of the container is opened vertically, and the whole is divided vertically. A pair of crucibles with flanges on the outer edges of the openings of the divided parts, and the pair of crucible dividing surfaces formed on the flanges are closed. A melting chamber sealed with a chamber cover in which a cutout portion that forms an inverted triangle and a high-frequency coil that surrounds the crucible in a cylindrical shape and a viewing window glass is provided on the upper surface, and a molten metal that flows out from the bottom of the crucible A casting chamber containing a mold into which is injected, a fixed support body for supporting the crucible flange in a suspended manner in the melting chamber with the lower surface of the crucible flange as a supporting point ;
A movable part comprising a horizontal part that is in contact with the pair of crucibles by the force of a spring and is biased in a direction in which the crucibles are closed and restrained, and a vertical part that inclines the horizontal part around the axis so that the tip is pushed down. A support;
A rod that presses the vertical portion of the movable support when moved in the horizontal direction, and tilts the horizontal portion of the movable support against the force of the spring;
Rod driving means for driving the rod;
By moving the rod in the horizontal direction by the rod driving means and pressing the vertical portion of the movable support, the horizontal portion of the movable support is inclined against the force of the spring and the crucible when releasing the restraint, in a state in which the supporting point of the fixed support is suspended the crucible, as a fulcrum inverted triangle bottom apex of the notch, the crucible in accordance with the amount of displacement of the movable support It is configured to open in a wedge shape from the bottom by its own weight ,
Put the metal to be melted in the crucible with the crucible closed and constrained,
In the molten metal injection apparatus for injecting the molten metal in the crucible into the mold with the crucible opened in a wedge shape from the bottom,
A flange pressing tool having a wedge-shaped convex portion corresponding to the notch,
When injecting the molten metal into the mold, the flange pressing tool is pulled up from the upper surface of the crucible,
When the metal to be melted is set in the crucible, the flange pressing member is pressed from above the crucible flange, and the wedge-shaped convex portion of the flange pressing member is fitted into the notch so that the crucible is in an appropriate position. A molten metal injection device characterized by guiding . The molten metal injecting apparatus according to claim 1, wherein the horizontal portion of the movable support body is disposed at a position where the horizontal portion abuts directly below a flange of the crucible . Melting metal injection device according to claim 1, wherein the horizontal portion of the movable support is characterized in that it is disposed at a position abutting the lower side surface of the crucible.

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