JPS6277167A - Centrifugal casting device - Google Patents

Abstract

PURPOSE:To obtain an ideal initial speed of centrifugal casting and to make a device compact over the entire part by using a melting furnace for a casting material and separating the same from a rotating arm, thereby reducing the driving power of a driving source and the load of the rotating arm. CONSTITUTION:A crucible 41 for casting is installed to a crucible holder 4 on one end side of the rotating arm 2 and a casting mold 51 is held on the centrifugal side of the crucible 41 in tight contact therewith by a casting mold holding part 5. A melting material for casting is melted in the melting furnace 6 for the casting material equipped to the outside of the rotating locus of the arm 2 and the molten material is accepted in the crucible 41. The arm 2 is rotated around the axial center of a revolving driving shaft 1 to pour the material in the crucible 41 into the mold 51 by centrifugal force by which said material is cast. A balance weight 5 provided on the other end side of the arm 2 is properly shifted and adjusted in the axial direction of the arm 2 in order to balance the weights of the respective members including the crucible 41 for casting, the mold 51, etc.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is an apparatus for centrifugally casting metal materials, glass materials, etc., and more specifically, it is particularly suitable for centrifugally casting artificial dental crowns and other dental components. related to equipment.

(Prior Art) Conventionally, centrifugal casting apparatuses have often been used to cast dental prosthesis and restoration parts using metal or glass materials. Such a centrifugal casting device holds a casting crucible at one end of a rotating arm, puts casting material into the crucible, heats and melts it using a torch, high frequency, arc melting, etc., and rotates the rotating arm. A device that uses centrifugal force to inject molten casting material into a mold connected to a crucible and cast it, or a melting furnace is installed surrounding the crucible, and during casting, the melting furnace is used together with a rotating arm. For example, there is a device that can also rotate.

(Problem to be solved by the invention) However, among the above casting devices, in the case of the former.

It is difficult to adjust the temperature of the heating means, and in the case of torch heating in particular, the appropriate melting temperature of the casting material must be determined by visual inspection.In addition, in the case of high-frequency heating or arc melting, the equipment is large-scale, making it difficult to control the temperature. Detection also has to be done optically, which tends to result in large temperature measurement errors. - In the latter case, accurate measuring means can be installed for temperature detection and the equipment is compact, but the melting furnace rotates with the rotary arm even though it is not directly involved in casting. The drive source (for example, an electric motor) to rotate these all at once requires a considerable amount of power, and a large moment is also applied to the rotating arm, so a thick and robust one must be used. In addition, in the case of centrifugal casting, it is desirable to reach the required rotational speed instantly after the rotation starts, but if a heavy melting furnace is installed at one end of the rotating arm, the load is large. However, it is extremely difficult to obtain the ideal initial speed. ...There were other problems.

(Object of the Invention) The present invention has been made in view of the above, and uses a melting furnace that can be temperature-adjusted and made compact as a heating furnace for melting casting materials, and also separates the melting furnace from the rotating arm. By rotating only the rotary arm, the power of the drive source is reduced, an ideal initial speed is obtained, and the entire device is made more compact.

(Means for Solving the Problems) The structure of the present invention for achieving the above object will be explained based on the attached embodiment diagrams. Fig. 1 is a perspective view showing an embodiment of the device of the present invention, Fig. 2 is a cross-sectional view taken along the vertical line ■-■ in Fig. 1, and Fig. 4 is a cross-sectional view taken along the vertical line taken along the line ■-■ in Fig. 1. Figures (a), (b), (c), and (d) are schematic process diagrams showing the procedure for melting and casting using the same apparatus, and Figure 5 is an exploded perspective view of the main parts of another embodiment.
FIG. 6 is a sectional view taken along the line VI--VI in FIG. That is,
The centrifugal casting apparatus of the present invention includes a rotary drive shaft 1 and a rotary drive shaft 1.
a rotary arm 2 that is attached to the tip of the drive @1 and rotates around the axis of the drive @1 by its driving force; and a balance weight 3 that is freely adjustable along the axial direction at one end of the rotary arm 2. , a crucible holder 4 for holding a casting crucible 41 that receives the melted material M for casting provided on the other end side of the rotating arm 2, and an SSS body holder connected to the centrifugal side of the crucible holder 4. 5, a casting material melting furnace 6 equipped to exist outside the rotation trajectory of the rotary arm 2 at least when the rotary arm 2 rotates; The gist is that the molten material M for casting melted in the melting furnace 6 is injected into the mold 51 held in the mold holder 5.

In the figure, 7 is a casing that houses the rotational drive means of the rotary arm 2 or control system equipment, 8 is an operation panel, and 9
A safety cover is hinged to the side of the casing 7 and is provided to cover the rotating parts during operation. The rotary arm 2 is mounted in a T-shape at the tip of the drive shaft 1, and the drive shaft 1 is driven by the driving force of an electric motor (not shown) installed in the casing 7, or by the outer periphery of the drive shaft 1. It rotates around its axis due to the elastic force of the spring 11 (see FIG. 3) fitted in the sleeve.

(Function) In the centrifugal casting apparatus of the present invention having the above configuration, the crucible 41 for casting is installed in the crucible holder 4, and the mold 51 is held in the mold holder 5 closely on the centrifugal side of the crucible 41. If the crucible 41 receives the melted material M for casting heated and melted by the melting furnace 6, and the rotary arm 2 is rotated around the axis of the drive shaft 1, the melted material M for casting inside the crucible 41 will be moved by centrifugal force. It is poured into a mold 51 and cast. At this time, in order to balance the weight of each member on the casting side (crucible 41, mold 51, etc.), the balance weight 3 is appropriately shifted in the axial direction of the rotary arm 2 for adjustment.

Therefore, since the load applied to the rotating arm 2 is only this casting side member and the balance weight 3, the power of the drive source for driving these can be small, and moreover, the required rotation speed can be reached at the same time as rotation starts. This allows the above-mentioned casting to be performed efficiently. Furthermore, since the casting material is heated and melted in the melting furnace 6, by combining this with appropriate temperature detection means, control means, etc., it is possible to easily set an appropriate temperature for each casting material.

(Example) Examples will be described below.

(Example-1) Figures 1 to 4 show an example in which a melting furnace 6 is installed in close proximity to the crucible holder 4 in a stopped state, and the molten material M for casting heated and melted in the melting furnace 6 is By tilting the melting furnace 6, it is transferred to the casting crucible 41, and the rotating arm 2
As described above, the material is injected into the mold 51 and cast. The casting crucible 41 has a shoe-like shape and receives the casting melt material M melted in the melting furnace 6, and has a pore 41 communicating with the cavity 511 of the mold 51 on its centrifugal side.
1 is drilled. The melting furnace 6 has a heat-resistant furnace core tube 61 in the center and a heating resistor 62 wrapped around it.
It is installed in the casing 7 so as to be tiltable toward the crucible holder 4 side.

A finger-shaped melting crucible 63 is fitted into the furnace core tube 61, and a casting material (ingot) m is inserted into the melting crucible 63.
is dissolved. Reference numeral 64 denotes a lid that covers the upper opening of the melting crucible 63, and is opened in conjunction with this when the melting furnace 6 is tilted. Also 631
A crucible holder is secured to the mouth edge of the melting crucible 63, and is designed to prevent the melting crucible 63 from falling out even when the melting furnace 6 is tilted by the elasticity of a leaf spring 632. Reference numeral 65 denotes a heat pair '6 for detecting the temperature inside the melting furnace 6, which is connected to a temperature control device (not shown) in the operation panel 8. A coil spring 11 is fitted around the drive shaft 1, and the spring 11 is charged up by an electric motor (not shown) or the like, and its restoring elasticity causes the rotation arm 2 to move.
rotates in the direction of arrow a.

A series of operations of each of the constituent members described above are programmed within the operation panel 8 and are automatically performed by operating buttons on the surface of the operation panel 8. This procedure will be briefly described in FIGS. 4(a) to (d).

[Figure 4 (a)]; Casting crucible 4 is placed in crucible holder 4.
1 and the molds 51 are respectively set in the mold holder 5, and the operation panel 8
Press the start button. This causes the melting furnace 6 to enter a preheat state.

[Figure 4 (b)]; When the second operation button (for example, named crucible key) on the operation panel 8 is pressed, the lid 6
4 opens and the melting furnace 6 tilts approximately 45 degrees.

When the melting crucible 63 containing the casting material m is inserted into the core tube 61 of the melting furnace 6 and the second operation button is pressed again, the melting furnace 6 and the lid 64 return to their original positions. The temperature in the melting furnace 6 is kept at the melting temperature, and the coil spring 11 is charged up.

[Fig. 4 (C)]; When the third operation button (for example, the casting key) on the operation panel 8 is pressed after covering the rotating part on the front with the cover 9, the melting furnace 6 will be rotated at an angle of about 135 degrees. The melting material M for casting is poured into the casting crucible 41, and the melting furnace 6 returns to its original position.

[Fig. 4 (d)]; Immediately after the melting furnace 6 returns to the outside of the rotation trajectory of the rotary arm 2, the rotary arm 2 rotates, casting is performed, and after the casting is completed, the rotary arm 2 stops at the initial position,
The state shown in FIG. 4(a) is returned (it is convenient to notify by a buzzer or the like), and another casting is performed by the above operation again.

In this way, a series of operations is performed by button operation, and since it requires less power and the entire device is compact, it is extremely advantageous in terms of space when installed in a dentist or the like. Furthermore, by programming the melting temperature, mooring time, etc. in advance according to the casting material, the operator can extremely easily carry out a series of operations from melting to casting with simple button operations.

(Example-2) Figures 5 and 6 show a unit 60.6 with two melting furnaces 6.
The rotating arm 2 is vertically oriented in a stopped state, and the mold 51 and the furnace core tube 61 into which the finger-shaped casting crucible 41 is inserted are placed along the rotating arm 2. The crucible holder 4 and the mold holder 5 are fixedly attached to the furnace core tube 61, and the two-divided units 60 and 60 surround the furnace core tube 61, and the casting material m placed in the crucible 41 is melted. When the casting material m is melted, the melting furnace 6 is moved in sections (retracted out of the rotation trajectory of the rotary arm 2), and the rotary arm 2 is rotated in the direction of the arrow. The melted material M (m) passes through the opening into the mold 5 through the cavity 511 due to centrifugal force.
1 and cast. Other parts are listed in 1 above.
This is similar to the embodiment. Also, these series of operations are
As in the first embodiment, it can be programmed to be automatically performed by button operation in association with various control devices in the operation panel.

It is best to use a platinum alloy as the heating resistor for the melting furnace 6.

(Effects of the Invention) As described above, the centrifugal casting apparatus of the present invention uses a melting furnace that can adjust the temperature and be compact to melt the casting material, so it is extremely easy to set the appropriate melting temperature. can be,
A series of operations from melting to casting can be performed automatically by programming in advance. also,
During casting, the melting furnace is located outside the rotating locus of the rotating arm and does not take part in casting, so the load on the rotating arm and its power source is small, making the entire device extremely compact. It can be made into something. Furthermore, due to the low load on the rotary arm due to the fact that the melting furnace does not rotate, the rotary arm quickly reaches the required rotational speed desired for casting upon start-up, and centrifugal casting is carried out quickly and efficiently.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the device of the present invention, Fig. 2 is a cross-sectional view taken along the vertical line - - ■ in Fig. 1, Fig. 3 is a cross-sectional view taken along the mm-m green ribbon in Fig. 1, and Fig. 4 (a), (b), (c), and (d) are schematic process diagrams showing the procedure for melting and casting using the same equipment.5. Figure 5 is an exploded perspective view of the main parts of another embodiment. Figure 6 is V in Figure 5
There is a sectional view taken along the line I-VI. (Explanation of symbols) 1... Drive shaft, 2... Rotating arm, 3
... Balance weight, 4... Crucible holder, 41... Casting crucible, 5... Mold holding part,
51... Mold, 6... Melting furnace, 60.
...Melting furnace unit. one or more one

Claims (1)

[Claims] 1. A rotary drive shaft, a rotary arm that is attached to the tip of the drive shaft and rotates around the axis of the drive shaft by the driving force, and a rotary arm that is attached to one end of the rotary arm. A balance weight that is adjustable along the axial direction, a crucible holder provided at the other end of the rotary arm for holding a casting crucible that receives molten material for casting, and a centrifugal support for the crucible holder. It consists of a mold holding part connected to the side, and a casting material melting furnace equipped to exist outside the rotation trajectory of the rotary arm at least when the rotary arm rotates. A centrifugal casting apparatus configured to inject and cast a molten material for casting melted by the melting furnace in the crucible into a mold held by the mold holder. 2. The melting furnace includes a removable melting crucible and is installed outside the rotation trajectory of the rotary arm, and the melted material for casting heated and melted in the melting crucible in the melting furnace is held in the crucible holder. 2. The casting apparatus according to claim 1, wherein the casting apparatus is moved to a casting crucible in which the caster is placed and cast by rotating a post-rotating arm. 3. The melting furnace is of a removable split type that surrounds the crucible holder, and the melting furnace heats and melts the casting material in the casting crucible held in the crucible holder, and divides the melting furnace into a rotary arm. 2. The casting apparatus according to claim 1, wherein the rotary arm is rotated to perform casting after being retreated from the rotation locus.