JPS582530Y2 - High frequency centrifugal casting equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a high-frequency centrifugal casting device that melts a metal material in a crucible using high-frequency induction heating and pours the melt into a mold using centrifugal force to cast dental materials, etc. .

In general, the casting section of a small centrifugal casting device for dental laboratories consists of a crucible (see Fig. 1a and b) into which the material to be melted is placed.
The crucible is composed of a mold holder 3 on which a mold 2 is placed, a rotating body 6 with a rotating arm 5 having a balance weight 4 attached to it for vibration prevention during rotation, and a heating mechanism that heats the crucible 1. There is.

In a high-frequency centrifugal casting apparatus using high-frequency induction heating as a heat source, a heating furnace body coil 7 that can be raised and lowered is used as a heating mechanism.

This heating furnace body coil 7 rises when the metal material is melted, covers the outer periphery of the crucible 1, and melts the metal material in the crucible 1 by passing a high frequency current therethrough.

When the metal material in the crucible 1 is completely melted, the heating crucible body coil 7 is lowered and the rotating arm 5 starts rotating at high speed.

Due to the centrifugal force caused by this rotation, the molten metal in the crucible 1 is injected into the mold 2 from the sprue of the crucible 1 and molded.

In such casting technology, it is considered an essential condition for producing a good cast product that the sprue of the crucible 1 and the spout of the mold 2 are fixed so that they match each other when the mold is inserted.

By the way, the mold 2 is usually made with a so-called investment agent, and its shape is determined by the outer circumference, outer diameter, height,
A variety of miscellaneous shapes are required due to manufacturing and specification issues such as the position of the pouring hole.

In conventional casting equipment, such a mold 2 is moved by a rotary arm 5.
Since the molds are set in the mold holder 3, if there are too many types of molds 2, a large number of mold holders 3 to match the molds 2 must be prepared, making the work cumbersome.
Ru.

Conventionally, in order to make the mold 2 uniform, a stainless steel outer frame ring 8 as shown in FIG. 2 is made, and a investing agent is poured into this ring 8 to form the prototype of the mold 2.

For this reason, considerable restrictions have been placed on the shape of the mold 2, such as having a round outer mold, dividing the outer diameter into several types in stages, and providing the pouring port 2a in the center of the round mold.

The present invention was developed in view of the above circumstances, and its purpose is to place a crucible and a mold on one side of a rotating body that is driven to rotate at high speed on a horizontal plane so as to balance the balance weight on the other side. In a high-frequency centrifugal casting device that melts a metal material placed in the crucible by induction heating of a heating coil, and pours the molten metal into the mold using centrifugal force for casting, one side of the rotating body two holding members facing each other in the radial direction are provided at the distal end, the holding member on the rotating shaft side is movable in the radial direction, and elastic means biases the holding member in the centrifugal direction; and locking means for regulating the movement width of the holding member is provided on the rotating body, and the crucible is supported on the rotating body so as to be able to move toward and away from the mold. An object of the present invention is to provide a high-frequency centrifugal casting device that can freely set molds with different external shapes by bringing the crucible into contact with a mold by centrifugal force accompanying the rotation of the crucible and pouring molten metal into the mold.

Hereinafter, the present invention will be described in detail with reference to illustrated embodiments.

3a and b, 10 is a rotating body whose center is supported by a rotating shaft 11, and this rotating body 10 has a crucible 12 and a mold 13 disposed on one side, and a balance attached to the other side. It is balanced with weight 14.

The rotating body 10 is supported in parallel to the arm part 15a of the U-shaped rotating arm 15 (161, 16).
z extends, and a mold support mechanism, which will be described later, is provided between these support shafts t161 and 162.

The mold support mechanism consists of two front and rear presser plates 171 and 17z provided between the support shafts 161 and 162, and the front presser plate 171 is used for the support shirts N6t and 162.
The lower end is slidably provided on the rear presser plate 172.
It extends in the direction to form a fall prevention part 17a, and is always biased in the direction of the rear presser plate 17°, that is, in the centrifugal direction, by springs 18 disposed on the support shafts 16i and 16z.

On the other hand, the rear presser plate 172 is the support shirt) 16i,
16z is fixed to the tip via a screw 19.

These front and rear presser plates 17. , 172 are provided with insulators 20 on opposing surfaces thereof, and the mold 13 is held between them by the biasing force of the swing ring 18.

Lock fingers 21 are attached to both sides of the front holding plate 171 facing forward, and are attached to the tip hook portion 22a of a lock handle 22 rotatably supported on the side surface of the arm portion 15a of the rotary arm 15. engaged.

This lock handle 22 is U-shaped with a handle 22b1 in the center and the hooks 22a at both ends, and one end of an L-shaped arm 23 attached to both ends can be rotated via a pivot support 24. It is pivoted on.

The lock handle 22 is rotated about the pivot support 24, so that the hook portion 22a is rotated around the lock finger 2.
1, and pulls the front presser plate 171 against the biasing force of the spring 18, so that the front and rear presser plates 171
．． 172 to separate them from each other.

Note that an opening (not shown) is formed in the center of the front presser plate 171, and the casting opening of the mold 13 is arranged to align with the opening.

On the other hand, a swing support 2 is provided at the tip of one side of the arm portion 15a.
5, and a swing arm 2 is rotatably attached to this swing support 25.
6 is disposed, and the crucible 1 is placed at the tip of the rotating arm 26.
A crucible holder 27 for placing the crucible 2 is fixed thereon.

The position of the crucible stand 27 is determined so that the orbit of the crucible 12 and the position of the mold 13 coincide with each other.

That is, the crucible 12 is located so as to pass on a line connecting the rotating shaft 11 of the rotating arm 15 and the center of the mold 13, and at a position where the arm portion 15a and the rotating arm 26 are perpendicular to each other. The distance between the sprue of the crucible 12 and the spout of the mold 13 is set to a predetermined distance.

Reference numeral 28 denotes a cylindrical heating furnace coil disposed around the outer periphery of the crucible 12. This furnace coil 28 is connected to a high frequency power source (not shown) and heats the metal material inside the crucible 12 by induction.

Further, the furnace body coil 28 is equipped with a lifting mechanism (not shown), and is lowered simultaneously with the melting of the metal material.

Note that the rotating shaft 11 is supported by a support 29 and connected to a drive mechanism (not shown), and the rotating shaft 11 is
It rotates at high speed.

Next, the operation of the high frequency centrifugal casting apparatus having the above configuration will be explained.

First, hold the lock handle 22 by the handle 22b and pull it upward.

Then, the L-shaped arm 23 rotates about the pivot support 24 as shown by the solid line arrow in the figure, and the hook portion 22a of the lock handle 22 rotates while attaching the lock finger 21 to the spring 18 as shown by the arrow in the figure. Pull while resisting the force.

That is, the lock finger 21 converts the circular arc movement of the tip of the lock handle 22 into a linear movement.

As a result, the front and rear presser plates 171 and 172 are separated from each other.

Next, the mold 13 is positioned between the presser plates 171 and 172', and the lock handle 22 is lowered as indicated by the dotted arrow in the figure.

As a result, the front presser plate 171 is pushed as shown by the dotted arrow by the biasing force of the spring 18, and clamps the mold 13 together with the rear presser plate 172.

Then, the power to the furnace body coil 28 is turned on, and the metal material is melted by induction heating.

At the same time as the metal material is melted, the furnace body coil 28 is lowered, and the drive mechanism is immediately operated to drive the rotating body 10 in the direction of the arrow in the figure.

At this time, centrifugal force acts on the front holding plate 171 in addition to the biasing force of the spring 18, so that the mold 13 is reliably held.

At the same time as the rotating body 10 rotates at a high speed, the crucible mounting table 27 is also swung around the pivot support 25 by centrifugal force.

As a result, the crucible 12 moves in the direction of the arrow and the mold 1
3, molten metal is poured into the mold 13 by centrifugal force, and dental products etc. are cast.

Next, when the casting is completed, the lock needle 22 is pulled up again and the lock finger 21 is pulled in the direction of the arrow to separate the holding plates 171 and 172 and take out the mold 13.

As described above, according to the high frequency centrifugal casting apparatus of the present invention, the mold is held separately from the crucible by the two holding members that can be moved into and out of contact with each other, so a mold holder is not required, and Since support is possible regardless of the external shape of the mold, it can also be applied to molds of different sizes.

Furthermore, the crucible is supported by a rotating body so as to be able to move toward and away from the mold, and the crucible is brought into contact with the mold by the centrifugal force caused by the rotation of the rotating body, so that molten metal is poured. Pouring of molten metal is performed smoothly.

Furthermore, since the biasing force of the spring for moving the holding plate on the rotating shaft side is made to coincide with the direction of the centrifugal force, the mold can be sufficiently clamped even if the elastic force of the spring is weak.

Regardless of where the casting spout is formed in the mold, the casting spout can be set at a predetermined position by adjusting the mounting position of the mold when the mold is held between the holding plates.

[Brief explanation of the drawing]

Figures 1a and b show a conventional high-frequency centrifugal casting device, where a is a plan view, b is a front view, Figure 2 is a perspective view showing a part of the mold holder in Figure 1, and Figure 3 atb is a main body. A high-frequency centrifugal casting device according to an embodiment of the invention is shown, a is a plan view, and b is a top view.
is a front view. 10... Rotating body, 11... Rotating shaft, 12...
・Crucible, 13...Mold, 14...Balance weight, 1
5... Rotating arm, 161, 162... Support shaft, 171° 172... Pressing plate, 18... Spring, 21... Lock finger, 22... Lock-
・Handle, 24° 25... Rotating support, 27... Crucible mounting stand, 28... Furnace body coil for heating.

Claims (1)

[Scope of utility model registration request] The crucible 12. l
=- and a mold 13 are arranged, the metal material placed in the crucible 12 is melted by induction heating of the heating coil 7, and the molten metal is poured into the mold 13 by centrifugal force for casting. In the apparatus, two holding members 171 and 172 are provided at one end of the rotating body 10 and are opposed to each other in the radial direction, and of the holding members 171 and 172, the holding member 171 on the rotating shaft side is moved in the radial direction. The rotating body 10 is provided with an elastic means 18 for biasing the holding member 171 in the centrifugal direction and a locking means for regulating the movement width of the holding member 17.0, and the crucible 12 is placed in the mold 1.
The crucible 12 is brought into contact with the mold 13 by the centrifugal force generated by the rotation of the rotor 100, and melted. A high-frequency centrifugal casting device characterized by pouring metal.