JPH022523Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present application relates to a centrifugal casting machine used for casting small volume metals such as dental crowns.

Conventional technology Conventionally, a crucible and a mold were installed at one end of a horizontal rotating table installed on a rotating shaft, and a balancer was installed at the other end, and the rotating shaft was rotated at high speed.
A centrifugal casting machine for casting, for example, a dental metal crown by flowing metal melted in a crucible into a mold by centrifugal force is known, for example, in Japanese Utility Model Application Publication No. 55-177967.

Problems that the invention aims to solve However, according to the conventional centrifugal casting machine mentioned above,
The mold side is fixed, the crucible side is slidable, and the receiving plate with the crucible is slid toward the mold by centrifugal force during casting, so that the inflow of the crucible and the inflow hole of the mold are correctly aligned. Not only is alignment extremely difficult, but the collision force generated when the crucible receiving plate slides due to centrifugal force and is received by a stopper, etc., may impede the flow of molten metal or damage the fragile crucible. It has the following disadvantages.

Means for Solving the Problems Therefore, in order to eliminate the inconveniences of the conventional ones, the present application provides a tube that extends rearward and has a flange at the rear end on both sides of a horizontal substrate that is horizontally rotated by a drive source. The shafts are mounted parallel to each other, and both sides of a crucible receiving plate having crucible mounting holes are slidably provided on the shafts, and both sides of a front clamping plate of a pair of clamping plates that clamp the mold are slidably attached to the shafts. A rear clamping plate is installed between the rear ends of the pair of tube shafts by penetrating the slide arms and facing the front clamping plate, and between the front ends of the slide arms, a horizontal plate protrudes horizontally from the front end of the horizontal board. A supporting metal fitting is installed which moves in cooperation with the axial direction by rotation of a fastener screwed into the provided screw shaft, and further between both sides of the crucible receiving plate and both sides of the front clamping plate, It is characterized by interposing a spring that elastically fixes them in opposite positions in a loaded state.

When the fastener is rotated, the fastener and the support fittings that cooperate with it move in the axial direction of the screw shaft, and the rear part of the fastener, which is attached to both ends of the support fittings via slide arms, moves in the axial direction of the screw shaft. The clamping plate also moves in the same direction to change the facing distance from the front clamping plate, and by rotating the fastener, the mold can be clamped between the pair of front and rear clamping plates.

In the present application, the more the rear clamping plate is moved in the direction of the front clamping plate by the rotating operation of the fastener, the more the springs interposed between both ends of the crucible receiving plate and both ends of the front clamping plate are moved. has strong elasticity, and due to this elasticity, the mold is strongly clamped by the front and rear front clamping plates.Moreover, the biasing direction of the spring coincides with the direction of action of the centrifugal force generated by high-speed rotation, so that the mold is rotated. There is no risk that the mold will fluctuate erratically during driving.

Note that when the rotating shaft is rotated at high speed while holding the mold, the molten metal in the crucible will
The centrifugal force causes the material to flow into the mold through the communication groove, and casting is performed.

Embodiment The present invention will be explained below based on an embodiment shown in the drawings. Holes 3, 3' are formed on both sides of a flat T-shaped horizontal substrate 2, which is horizontally attached to the upper end of a rotating shaft 1. are drilled respectively, and each hole 3,
Inside 3' is a hollow tube shaft 5, which has an enlarged flange 4, 4' at one end and is threaded at the other end.
5' is located, and the horizontal board 2 is held between the front and rear two nuts 6 and 6 and 6' and 6' which are screwed together with this threaded part, and the two screws are attached to the horizontal board 2. The tube shafts 5, 5' are mounted parallel to each other, and between the enlarged flanges 4, 4' of both tube shafts 5, 5' and the nuts 6, 6' of the enlarged flanges 4, 4', respectively. The mounting pieces 7, 7' are slidably fitted, and the springs 8, 8' are interposed in a loaded state, and the springs 8, 8' are expanded between the tube shafts 5, 5'. A front clamping plate 9 is installed which is pressed against the flanges 4 and 4', and a crucible mounting hole 10 is provided in the mounting pieces 7 and 7' to fit and hold the crucible B in the center position.
A crucible support plate 11 provided with a crucible is supported in a horizontal state via screws 12.

Further, a long slide arm 1 is inserted into the hollows of both the tube shafts 5, 5' and extends therethrough.
3 and 13' are respectively located, and a rear clamping plate 14 is located between one end of both slide arms 13 and 13' so as to face the front clamping plate 9 installed between the tube shafts 5 and 5'. is installed via a nut 20, and between the other ends of both tube shafts 5 and 5' is a fastener having a through hole 15 in the center and a screw hole coaxial with the through hole 15. A support fitting 17 to which a fitting 16 is rotatably attached is installed via a nut 21. A through hole 15 of the support metal fitting 17 is inserted into the center of the tip of the horizontal board 2, and the fastener 16 is screwed to extend in the opposite direction to the front and rear clamping plates 9, 14, and a balance plate is provided at the free end. The base end of a screw shaft 19 onto which the weight 18 is screwed is fixed.

The front clamping plate 9 and the rear clamping plate 14 have opposing surfaces a and b that are parallel to each other and are inclined in the horizontal direction at a predetermined angle with respect to the direction of movement. A communication groove 9' is formed in the center thereof, and an axis n' passes through the center of the crucible mounting hole 10 provided in the crucible receiving plate 11 and passes through the center line of the communication groove 9' of the front clamping plate 9. is inclined by a predetermined angle θ with respect to the axis n passing through the rotation center point p of the rotation shaft 1,
The crucible mounting hole 10 is provided offset from the center of the crucible receiving plate 11 in the direction of rotational movement.

That is, the inclined surfaces a and b of the front and rear holding plates 9 and 14
The center line of the communicating groove 9' and the center of the crucible mounting hole 10 are located on the axis n' that is substantially perpendicular to the axis n'.

Reference numeral 22 in the figure is a mechanism unit that moves up and down the high-frequency heating coil 6 that surrounds the outer periphery of the crucible B held by the crucible mounting hole 10 from below.

Therefore, the fastener 16 provided on the support fitting 17
When the screw shaft 19 is rotated, the screw shaft 19 is screwed into the fastener 16, so that the fastener 16 and the support fitting 17 move in the axial direction of the screw shaft 19. Further, at both ends of the support fitting 17, horizontal substrates 2
and a tube shaft 5 connecting both ends of the front clamping plate 9,
Slide arm 13, 1 passing through 5' in the middle part
3' is attached by a nut 21,
Since a rear clamping plate 14 is installed between the other ends of the slide arms 13 and 13', the rear clamping plate 14 comes into contact with the front clamping plate 9 by rotating the fastener 16. If the mold A is placed between them, the pair of front and rear clamping plates 9, 14
It can be sandwiched between

In addition, as mentioned above, the pair of front and rear clamping plates 9, 14
Since the opposing surfaces a and b are inclined at a predetermined angle θ with respect to the axis n passing through the center of rotation, the casting path of the mold is also on the axis n'. and is on the central axis n' of the communication groove 9' provided in the front clamping plate 9, so that the molten metal flowing into the mold from the crucible due to the centrifugal force flows correctly into the deep part of the mold.

Further, since the front clamping plate 9 is always urged toward the rear clamping plate 14 by the spring 8 wound around the tube shafts 5 and 5', the rear clamping plate 14 is moved to the front clamping plate 9 by the fastener 16. The more the mold moves to the side, the stronger the elasticity is, and the mold is held between the pair of holding plates 9 and 14, and the direction in which the spring 8 urges the front holding part 9 is the direction in which the centrifugal force generated by high-speed rotation acts. , it is possible to reliably prevent the mold from being displaced from its normal holding state during rotational driving.

In addition, in the above embodiment, the crucible mounting hole 10
A preferred embodiment has been shown in which the axis n' passing through the center of the communication groove 9' and the center of the communication groove 9' is inclined by a predetermined angle θ with respect to the axis n passing through the center of rotation. 9 and the rear clamping plate 14 may be perpendicular to the axis passing through the center of rotation, and the screw shaft 19 has a threaded portion only at the portion where it is screwed into the fastener 16. As shown in FIG. 3, a threaded rod 22'' with a handle is screwed into the cutout position of the main body 22' having a cut-circular shape as shown in FIG. By rotating the main body 2
Of course, it is also possible to use a weight 22 whose inner diameter is reduced.

Effects of the invention As described above, according to this invention, the crucible receiving plate and the front clamping plate that clamps the mold are fixed, and the rear clamping plate is slidable in the axial direction. This not only allows for correct alignment between the crucible and the inflow hole of the mold, but also eliminates the risk of the crucible receiving plate sliding due to centrifugal force and interfering with the flow of molten metal or damaging the crucible. Since springs are interposed between both sides of the receiving plate and both sides of the front clamping plate to elastically fix them in opposing positions, it is possible to ensure the normal clamping state of the mold and also to prevent excessive forces acting on the mold. It has the advantage of being able to alleviate the clamping force and eliminate damage to the mold, and furthermore, the rear clamping plate can be brought into contact with and separated from the front clamping plate by simply rotating the fastener. The installation and removal of the mold can be done easily and quickly, resulting in good workability, and unlike conventional mold installation, which takes time, the heated mold loses heat before it is centrifugally rotated, resulting in high quality. It has the advantage of being able to improve defects that make it difficult to obtain cast products.

[Brief explanation of drawings]

The drawings show an embodiment, and FIG. 1 is a front view, FIG. 2 is a plan view, and FIG. 3 is a diagram showing another embodiment of the weight. In the drawing, 1 is a rotating shaft, 2 is a horizontal substrate,
5, 5' are tube shafts, 7, 7' are mounting pieces, 8 is a spring, 9 is a front clamping plate, 10 is a crucible mounting hole, 11
Crucible receiving plate, 13, 13' are slide arms,
14 is a rear clamping plate, 16 is a fastener, 17 is a supporting metal fitting, 8 and 22 are weights, 19 is a screw shaft, and 9' is a communication groove.

Claims (1)

[Scope of utility model registration request] Tube shafts extending rearward and having a flange at the rear end are attached in parallel to both sides of a horizontal substrate that is horizontally rotated by a drive source, and are attached to both sides of a crucible receiving plate having crucible mounting holes. , the front clamping plate is slidably provided with both sides of the front clamping plate of a pair of clamping plates that clamp the mold, and the front clamping plate is provided with a slide arm passing through each of the pair of tube shafts and between the rear end portions of the front clamping plate. A rear clamping plate is installed opposite to the slide arm, and between the front ends of the slide arm, the screw shaft protrudes horizontally from the front end of the horizontal board and a fastener is screwed into the screw shaft, which cooperates in the axial direction by rotating. The present invention is characterized in that a supporting metal fitting that moves is attached, and furthermore, springs are interposed between both sides of the crucible receiving plate and both sides of the front clamping plate to elastically fix them in opposite positions in a loaded state. Centrifugal casting machine.