JPS5874263A - Pressure casting machine by high frequency melting - Google Patents

Abstract

PURPOSE:To facilitate insertion of molds without losing safety and anti-staining property by forming the mold into one body in the lower part of a crucible, containing the crucible part in a heating chamber and the mold part in a lower chamber and bringing the mold and the lower chamber into press contact with the heating chamber. CONSTITUTION:A mold cradle 12 and a housing 7 are located in the lowermost end and an exhaust fan is operated to discharge air through a connecting part 21 and to evacuate the inside of a heating chamber 4. A mold formed with a mold 3 in one body in the lower part of a crucible 2 is lifted from the cradle 12 and the projecting crucible 2 is inserted into the chamber 4 from below. The mold 3 is vacuum sucked to the opening part at the bottom end of the chamber 4. Thereafter, the cradle 12 is brought into pressure contact with the bottom of the mold 3 by operating a lower pneumatic driving mechanism; at the same time, the housing 7 is fitted to an annular cover 6' in press contact therewith. Therefore, the need for positioning of the mold 3 in the cradle 12 is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is a high-frequency melting method in which an alloy melted in a reduced pressure atmosphere or an argon gas atmosphere is cast into a mold placed in an atmospheric state by continuous pressurization of argon gas, etc. Concerning improvements to pressure casting machines.

, Lit has traditionally been used to cast dental prosthetic materials.
A casting machine as shown in the figure is used. This casting machine has a high-frequency induction coil (1
) in a convex-shaped airtight container with a crucible (2
A mold (3) integrally formed with the heating chamber (4) is housed as shown in the figure, and the shoulder of the mold (3) is pressed against the opening at the lower end of the heating chamber (4), thereby forming the heating chamber (4) and its lower chamber. (5) and airtight separation during casting.

After reducing the pressure in the upper and lower chambers to about 10-'' Torr.

The circular metal mass of the crucible (2) is melted by induction heating, and then an inert gas such as argon gas of about 5 atm is introduced into the heating chamber (4), and the gas pressure is used to melt the metal mass of the mold (31 It is configured to cast molten metal into a circle.

Therefore, the heating chamber (4) must be completely sealed at the shoulder of the mold (3), and the lower chamber (5) must be completely sealed.
) is made up of a fixed lid (6) and a vertically movable casing (
7) The mating surface must be completely sealed.

For this reason, the conventional casting machine uses, for example, the push-up blade of the lower compression coil spring (, 9) as shown in the figure. Body (7
) is pressed against the fixed lid (6),
Also, the push-up blade of the upper compression coil spring αe? 4 is the mold (
3) is brought into pressure contact with the lower end opening of the heating chamber (4).

and the outside of these heating chambers (4) and the outside of the lower chamber (5).

The outside of the drive mechanism is to ensure the safety of the equipment.

In order to prevent contamination from the outside atmosphere, the entire container is usually surrounded by a single enclosing case (father), leaving some viewing windows.

With the above conventional equipment, it is difficult to put the casting material into the crucible (2) of the mold, and it is also difficult to place the entire mold (3) into the heating chamber (4) by lowering the mounting table. mosquito:
From the outside 0 side 1 6 5': Also, the whole 0 case ((material)) gets in the way, and the mold 13) itself often changes its swelling dimensions, so it is difficult to center the mold with respect to the heating chamber. It has the disadvantage of being difficult.

This invention seeks to eliminate these drawbacks by making it extremely easy to center and insert the mold into the heating chamber.
The present invention also aims to provide a high-frequency melting and pressure casting machine that does not lose its overall safety and stain resistance.

That is, this invention has a mold in which a crucible is integrally molded in the upper protruding part and a mold air conditioning part is provided inside the lower base. The molds are placed in pressure contact with the lower opening of the heating chamber with a vertically movable mold holder; In a high-frequency melting and pressure casting machine, the heating chamber and the lower chamber are each independently depressurized or pressurized, and the heating chamber and the lower chamber are each independently depressurized or pressurized. , which is applied to a high-frequency melting and pressure casting machine in which the outer surface of the bottom surface of the heating chamber and the royal part consisting of a vertically movable casing are exposed to the outside, and other mechanical parts are covered with a casing. .

Next, the present invention will be explained by examples.

FIG. 2 is a longitudinal sectional view of the casting machine according to the embodiment, and FIG. 3 is a perspective view showing its external expansion. In the figure, the explanation of the same parts as in Figure 111 will be omitted. In the embodiment shown in Fig. Ii2, a pneumatic cylinder device is used for the vertical movement mechanism of the mold table @ and the vertical drive mechanism of the F chamber (5).

This point is not the gist of the invention.

The heating part (4) in which the crucible (2) is accommodated is made of 9 quartz glass I<b>s, and the upper end thereof is sealed with quartz glass to form a viewing window (11). The high-frequency induction coil (1) attached to the outside of (4) is connected to a high-frequency generator (not shown) and is cooled by cooling water circulating at a distance of 41 m +c outside the coil (1). .

The lower chamber (51) in which the mold (3) is housed is made up of an asbestos molded material upper cover (6) and an aluminum alloy annular cover (-) integrally connected thereto, which fits into the annular cover opening and moves up and down. It is formed from a casing (7).

Then, this upper cover (6) and the annular Jl tar form a fixed cover (6) for the housing (7).

The housing (7) is made of aluminum alloy, has an open bottom end, and is raised and lowered by a hydraulic cylinder mechanism (4). In addition, the mold holder 0 has a fluid pressure cylinder mechanism (
4) It is also raised and lowered in conjunction with the lever housing (7).

(To) LI is an intake/exhaust port connected to the air compressor via a switching valve, and 0m is an exhaust port for slowly lowering the large diameter piston rod.

Note that a pressure regulator is connected upstream of the intake/exhaust port (2) so that the air pressure inside the cylinder can be set to a desired pressure.

In addition, the lower end of the large diameter piston rod 11m is opened to a seal of 0 yen, and by introducing compressed air into this cylinder (13P), the large and small piston rods aω, (
to) are simultaneously driven in conjunction. in this case.

The small diameter piston rod a- moves upward faster than the large diameter piston rod, and when moving downward, the large diameter piston rod a- moves downward faster.

Nao, all, 1216 Ham Heat Chamber (41 To Royal Family (51
This is the connection part with the exhaust system that reduces the pressure to about 10-2 Torr, and the ca is about 51
This is an introduction part for pressurizing argon gas having a pressure of about 1 kg/cm"G, and @ is an introduction part for gas replacement argon gas having a pressure of about 1 kg/cm"G.

Next, Il is a housing that covers the upper heating chamber, and the lower bottom of the heating chamber is open and is provided with a window through which isαJ can be observed from outside the housing. This window (to) is li
As shown in Figure 3, it is also possible to incorporate a suitable reflector or the like and attach it to the front. (Foundation) is a lower chamber housing that covers the lower chamber housing (7) and the driving devices that drive the mold table @ up and down. The middle section between the upper and lower cabinets is supported by suitable supports and is open to the outside. Its outer shape is as shown in a perspective view in FIG.

1: Next, the operation and usage of the apparatus according to the present invention will be explained.

When setting the mold (3) in such a casting machine, conventionally, the mold (3) is placed on the mold cradle opening, the mold cradle opening is raised, and the crucible t21 is inserted into the heating chamber (41). However, the outer peripheral surface of the crucible (2) and the heating chamber (4)
) is extremely small, so when inserting the crucible (2) into the heating chamber (4).

Accurate positioning of the mold (3) at the mold cradle opening is required. However, the external shape of the mold (3) is irregular depending on the individual molds, and such irregular shapes are placed in the mold holder (
In 2), it is not easy to accurately position the mold pedestal 0 immediately below the heating chamber (4), and in particular, it is not possible to finely adjust the raising and lowering of the mold holder 0 manually. In such an apparatus, the crucible (2) is placed in a state where the mold (3) is placed on the mold pedestal a2.
) is extremely difficult to insert into the heating chamber (4).

Therefore, in the apparatus of this invention, the lutu (2) is set in the heating chamber (4) by the following method.

The heating chamber (4
). Then, insert your hand into the space (end) and hold the mold (3), lift it from the mold table @, and lower the crucible (2) directly into the heating chamber (4) with your hand as shown in Figure 2. Insert the mold (3) into the heating chamber (
4) Vacuum suction to the bottom opening.

In this case, the shoulder part of the mold (3) is loaded with a packing (2) made of asbestos material. Thereafter, the mold pedestal @ is brought into pressure contact with the bottom surface of the mold (3) by operating the lower pneumatic drive mechanism, and the housing (7) is fitted into the annular lid (61) and brought into pressure contact. (3) Precise positioning of the mold holder @ is no longer necessary.

The mold (3) can be easily set in a short time.

The space portion (2) is effective for these operations.

Since this invention is constructed as described above, regardless of the shape and dimensions of the mold, the crucible part, which is the convex protruding part, can be accurately centered in the heating chamber part and set quickly. This provides useful effects without compromising equipment safety or contamination resistance.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the main body part of an example of a conventional high-frequency melting and pressure casting machine, and FIG. 112 is a vertical cross-sectional view of an embodiment of the apparatus according to Jin's invention. FIG. 3 is a perspective view showing the outer shape of the device of this invention. (2)・・・Crucible (3)・・・Mold
(4)...Heating chamber (5)...Lower chamber (6)...Fixed lid (upper lid + ej and annular lid (6)
) (7)... Housing 0... Mold pedestal α
41. (151--Pistonropud(4)...
・Fluid pressure cylinder mechanism (To)...Lower case 6th...Lower case (To)...External open space 7゛,...-f Agent Patent attorney Master Manabu Kitamura, J1 1st Ri! i Figure 2 13M 34

Claims (1)

[Claims] 1. A mold in which a crucible is integrally formed in the upper protruding part and a mold air-conditioning part is provided inside the lower base, the crucible protruding part is placed in the heating chamber with the opening at the lower end, and the lower base is placed in the lower part adjacent to the heating chamber of the mold. The molds are housed in the respective chambers, and the molds are placed in pressure contact with the bottom opening of the heating chamber using a mold holder that is movable up and down; In a high-frequency melting and pressurizing casting machine, the machine is configured with a housing having a sealing part for the outer surface, and the heating chamber and the royal chamber are each independently depressurized or pressurized,
A high-frequency melting and pressure casting machine in which the outer surface of the bottom of the heating chamber and the lower chamber part, which is movable up and down and made up of a casing, are exposed to the outside, and other mechanical parts are covered with a casing.