JPS6144592B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a centrifugal casting machine for casting metal dentures and the like.

Generally, in the case of a centrifugal casting machine, a horizontal base is provided above a vertical rotating shaft, and a crucible holder and a crucible holder located outside the crucible holder are placed on one side of the base. In addition to attaching a mold, a weight for balance is attached to the other side, and when the base rotates, the molten metal in the crucible is poured into the mold by centrifugal force to perform casting.

The first object of this invention is to move the crucible holder outward in order to sandwich the mold between the crucible holder and a support block located on the outside of the crucible holder on one side of the horizontally provided base. In some cases, the balance weight provided on the other side of the base is also moved in conjunction with the movement of the crucible holder, so that the base is always centered around its rotation even when molds of different dimensions are installed. To provide a centrifugal casting machine that can automatically maintain balance.

A second object of the present invention is to move the crucible holder outward, clamp the casting between it and the support block, and attach the mold to the outside of the crucible holder, and then move the crucible holder to the moving mechanism portion of the crucible holder. To provide a centrifugal casting machine capable of preventing the mold from moving even slightly due to insufficient clamping force of the mold due to backlash or the like.

A third object of the present invention is to move the crucible holder outward, sandwich the mold between it and the support block, and install the mold, and then, during centrifugal rotation, move the crucible holder in the same direction as the centrifugal force acting on it. To provide a centrifugal casting machine which can prevent a mold from shifting with respect to a crucible holder during centrifugal casting by applying force to the crucible.

A fourth object of the present invention is to mount a base having a crucible holder on one side, a mold on the outside thereof, and a balance weight on the other side at right angles to a vertical axis of rotation. In other words, it is an object of the present invention to provide a centrifugal casting machine that can securely hold the base horizontally to prevent the base from tilting in a seesaw manner and achieve smooth centrifugal rotation.

The present invention will be described below based on the embodiments shown in the drawings. Reference numeral 1 is a rotating shaft rotated by a drive source, and the upper end of the rotating shaft 1 has a rectangular plane and an open bottom surface. A box-shaped frame 2 is supported so as to pass through the upper plate 3 from its lower surface.

Inside the frame 2, a pair of shafts 6 and 6' are provided parallel to each other, with one end extending horizontally through the left and right side plates 4 and 5 of the frame 2, and facing each other with the rotating shaft 1 in between. At the same time, threaded portions 6 _a and 6 _a ′ are provided at one end of each shaft 6 and 6 ′, and these threaded portions 6 _a and 6 _a ′ are provided with threads on the lower surface of the top plate 3 of the frame body 2 . A small gear 8, which is immovable and rotatable in the axial direction of the shaft by the attached mounting pieces 7, 7'.
The central screw holes 9, 9' of the parts 8' are screwed together.

On the other hand, the other end of a shaft 11 having a threaded portion 11 _a at one end is fixed to a fixed piece 10 fixed to the lower surface of the upper plate 3 of the frame 2, with the other end facing in the horizontal direction. The shaft 11 is rotatable, and
A large-diameter gear 12 that is screwed together with both the small-diameter gears 8, 8', and a screw hole 1 that is screwed with the threaded portion _11a .
3 and to which an operating rod 15 protruding from the elongated hole 14 of the top plate 3 is attached.
are provided for each.

A pair of support rods 19, 19', which are parallel to each other and whose other ends extend in a direction away from the rotating shaft 1, are fixed to the front and rear side plates 17, 18 of the frame 2 via set screws 20, Also support rod 19,1
A balance weight 21 is slidably attached to one end of the balance 9' through a hole 22 provided therein, and a side plate 23 is fitted with a screw 24 between its tips.
It is installed through.

Further, one end portion is supported in the hole 25 of the left side plate 4 of the frame body 2 and is located inside the frame body 2, and a threaded portion _29a provided at the other end portion is attached between the support rods 19 and 19'. A handle threaded shaft extends outward by threading into the central threaded hole 27 of the boss 26 press-fitted into the balance weight 21, and further passes through the side plate 23 and has a handle 28 for rotational drive at its tip. A gear 30 is provided at the rear end of the handle screw shaft 29 to mesh with the large gear 12.

The right side plate 5 of the frame 2 is wider in the front and back direction than the left side plate 4, and at both front and rear ends of the right side plate 5 are parallel to each other and extend horizontally to the right. A pair of guide shafts 33, 33' are provided to which the support block 32 of the mold 31 is mounted, and crucible supports 34, 3 are provided with both guide shafts 33, 33' slidably mounted respectively.
A crucible holder 36 having a crucible mounting hole 35 bored in the center is fixed between the crucibles 4', and the crucible holder 36 can move toward and away from the support block 32.

The right end portions of the pair of shafts 6, 6' extend through the right side plate 5, and are inserted into a cylindrical portion 38 protruding from a pressing plate 37 that can come into contact with the crucible receiver 36 via a spring 39. It is embedded.

Further, the frame 2 and the rotating shaft 1 are supported by the upper plate 3 of the frame 2, and these support the front and rear side plates 4, 5 of the frame 2 and the rotating shaft 1 at a position below the supporting part. They are connected by a through shaft 40 that extends through them and is perpendicular to the rotating shaft 1 . 41 is a high frequency heating coil.

When the handle screw shaft 29 is rotated using the handle 28, the balance weight ₂₁ is moved to both support rods 19, 19' and moves in the left-right direction, and the gear 30 provided at the right end of the handle screw shaft 29 inside the frame body 2 also rotates, so that a fixed part is attached to the lower surface of the top plate 3 of the frame body 2. The large-diameter gear 12 provided through the piece 10 and the shaft 11 and meshing with the gear 30 also rotates, and the mounting pieces 7,
The small gears 8, 8' whose movement in the left and right direction is regulated by 7' and are rotatably supported are also
Since they are meshed with the large diameter gear 12, they are rotated together. Therefore, these small diameter gears 8,
A pair of shafts 6, 6' are screwed into the central screw holes ₉ , 9' of 8' and threaded parts 6a, _6a ', and both ends of which pass through the left and right side plates 4, 5 of the frame 2. It will be moved left and right.

Also, a spring 39 is attached to the right end of the pair of shafts 6, 6'.
Since the press plate 37 attached via the handle 28 is in contact with the left side surface of the crucible holder 36, the mold 31 interposed between the support block 32 and the crucible holder 36 is moved by the rotating operation of the handle 28. By moving the pair of shafts 6, 6' to the right, the pressing plate 37
The crucible receiver 36 is also integrated with the guide shaft 33,
33' and clamps the mold 31 between it and the support block 32, and the balance weight 21 also moves to a predetermined position to maintain horizontal balance in the left and right positions around the rotation axis 1. is automatically obtained.

After the mold 31 is clamped between the support block 32 and the crucible holder 36, the handle shaft 2
9 is further rotated to press the spring 39 between the right ends of the pair of shafts 6, 6' and the pressing plate 37, and then the operating rod 15 protruding from the upper surface of the frame 2 is rotated. As a result, the rotating part 16 that is rotated as a unit moves to the right because its screw hole 13 is threadedly engaged with the threaded part 11 _a of the shaft 11, and the fixed part 10 is thereby moved to the right. The large-diameter gear 12, which is rotatable and located between them, is clamped and fixed.

Therefore, it is possible to prevent the clamping force of the mold from loosening due to external vibrations acting on the crucible receiver 36, etc. due to looseness that exists in the meshing portions of gears and threading portions of screws, thereby preventing the mold from being displaced. .

After attaching the mold 31 as described above and positioning the crucible in the crucible mounting hole 35 of the crucible receiver 35, the rotary shaft 1 is rotated to remove the crucible receiver 3.
6. When the mold 31 etc. are rotated in the horizontal direction, the top plate 3 of the frame 2 is supported by the rotating shaft 1, and the front and rear side plates 17, 18 of the frame 2 and the rotating shaft 1 are supported by the rotating shaft 1.
Since a through shaft 40 is provided that extends through the support block 32 on one side and the balance weight 21 on the other side can be maintained at the same vertical height. Thus, smooth horizontal rotation can be obtained.

As the molten metal in the crucible rotates, centrifugal force causes the molten metal to flow through the communication groove 4 provided in the crucible receiver 36.
During this casting operation, the shafts 6, 6' and the press plate 3
A spring 39 is interposed between the support block 32 and the support block 32, and the direction in which the crucible receiver 36 is biased by the spring 39 is the same as the direction in which the centrifugal force acts. Crucible receiver 3
5, and this clamping is further strengthened by the biasing force of the spring 39.

Furthermore, after the casting operation is completed, the rotating piece 16 is rotated by rotating the operating rod 15 to release the large diameter gear 12, allowing the handle 28 to rotate. This allows the pressure on the crucible holder 36 to be released, and then a new mold is installed and the casting operation is performed in the same manner as described above.

By configuring this invention as described above,
Since the balance weight is moved at the same time as the mold installation process, the balance weight can be placed in the correct position when the mold installation is complete, and even if molds of different dimensions are used, the balance weight will always be centered around the axis of rotation. The left and right weight balance can be maintained automatically, which eliminates the trouble of adjusting the position of the weight each time the mold is installed, which is effective for work efficiency, and the rotation of the operating rod By fixing the moving operation mechanism of the crucible holder, it is possible to prevent the communication groove of the crucible holder from being misaligned with the casting opening of the mold during casting work due to loss of clamping force of the mold due to external vibration. The frame body, which has a balance weight on one side and a crucible holder and a mold on the other end, is attached to a rotating drive shaft that extends perpendicularly to the frame body. On the other hand, by being supported at two points in the vertical direction, the frame body, which has a weight for balance, a crucible holder, and a mold in symmetrical positions, is prevented from tilting in the vertical direction, and is always kept horizontal. This allows the casting operation and centrifugal rotation to be carried out smoothly.Furthermore, since the spring that biases the crucible holder is biased in the same direction as the centrifugal force that acts during the casting operation, the crucible holder moves toward the mold. This has the advantage that the pressing contact force becomes even greater, which allows reliable casting work to be performed and a high-quality cast product to be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment, and FIG. 1 is a partially cutaway plan view, FIG. 2 is a longitudinal sectional front view, FIG. 3 is a cross-sectional plan view, and FIG. 4 is a view taken along the - line in FIG. 1. be. In the drawing, 1 is a rotating shaft, 2 is a frame, 6,
6' is a shaft, 8, 8' are small diameter gears, 10 is a fixed part,
11 is a threaded shaft, 11 _a is a threaded portion, 12 is a large diameter gear, 15 is an operating rod, 16 is a rotating piece, 19, 1
9' is a support rod, 21 is a weight, 28 is a handle, 2
9 is a handle screw shaft, 30 is a gear, 31 is a mold,
32 is a support block, 33, 33' are guide shafts, 3
6 is a crucible receiver, 37 is a pressing plate, 39 is a spring,
40 is a through shaft.

Claims (1)

[Scope of Claims] 1. A frame body which is rotated by a drive source and is attached to a vertical rotating shaft, and a support block fixed to one side of the frame body at a position outwardly away from the frame body;
The first block is located inwardly from the support block.
a crucible holder which is supported so as to be movable in the horizontal direction via guide means, and which clamps the mold between the crucible holder and the support block by the movement thereof; 2nd one at a distance
A balance weight supported movably in the horizontal direction via a guide means, and an actuation means that is rotated by a handle operation to move the weight in the horizontal direction, and the actuation means and the crucible receiver are connected to each other. A centrifugal casting machine characterized in that an interlocking mechanism for horizontally moving the crucible receiver by the operating means is provided between the two. 2. The centrifugal casting machine according to claim 1, wherein the frame body is integrally provided with side plates that hang down around four peripheries of a rectangular upper plate. 3. The first guide means consists of a pair of guide shafts extending horizontally outward in parallel, and a support block is attached between one end of the guide shafts, and the crucible holder is supported at an intermediate position so as to be movable in the axial direction of the guide shafts. A centrifugal casting machine according to claim 1, comprising: 4. A centrifugal casting machine as claimed in claim 1, wherein the second guide means comprises a pair of parallel horizontally outwardly extending support rods. 5. The centrifugal casting machine according to claim 1, wherein the operating means comprises a screw shaft rotatably supported at both ends, and a weight is screwed onto the screw shaft. 6 the first part in which the interlocking mechanism is rotated by the actuating means;
A gear, a second gear that meshes with the second gear, a pair of third gears that mesh with the second gear in the diametrical direction and are prevented from moving in the axial direction, and a central screw hole of the third gear, respectively. A centrifugal casting machine according to claim 1, comprising two parallel shafts that are screwed together and move in the axial direction. 7. A support block which is rotated by a drive source and is attached to a vertical rotating shaft, and which is fixed to one side of the frame at a position outwardly away from the frame;
The first block is located inwardly from the support block.
a crucible holder which is supported so as to be movable in the horizontal direction via guide means, and which clamps the mold between the crucible holder and the support block by the movement thereof; 2nd one at a distance
A balance weight supported movably in the horizontal direction via a guide means, and an actuation means that is rotated by a handle operation to move the weight in the horizontal direction, and the actuation means and the crucible receiver are connected to each other. A centrifugal casting machine characterized in that an interlocking mechanism for horizontally moving the crucible holder by the operating means is provided between the interlocking mechanism and a fixing means for fixing the interlocking function to the interlocking mechanism. 8 the first part in which the interlocking mechanism is rotated by the actuating means;
A gear, a second gear that meshes with the second gear, a pair of third gears that mesh with the second gear in the diametrical direction and are prevented from moving in the axial direction, and a central screw hole of the third gear, respectively. It consists of two parallel shafts that are screwed together and move in the axial direction, and the fixing means rotatably supports the second gear, a fixing piece fixed to one end of the shaft, and the other part of the shaft. Claim 1, comprising: a rotating piece threadedly connected to an end; and an operating rod that rotates the rotating piece to clamp the second gear between it and the fixed piece. The centrifugal casting machine according to item 7. 9. A support block which is rotated by a drive source and is attached to a vertical rotating shaft, and which is fixed to one side of the frame at a position outwardly away from the frame;
The first block is located inwardly from the support block.
a crucible holder which is supported so as to be movable in the horizontal direction via guide means, and which clamps the mold between the crucible holder and the support block by the movement thereof; 2nd one at a distance
A balance weight supported movably in the horizontal direction via a guide means, and an actuation means that is rotated by a handle operation to move the weight in the horizontal direction, and the actuation means and the crucible receiver are connected to each other. An interlocking mechanism for horizontally moving the crucible holder by the actuating means is provided between the crucible holder and the crucible holder is provided between the interlocking mechanism and the crucible holder to constantly press the crucible holder in the direction of the support block. 1. A centrifugal casting machine characterized by having a biasing means for biasing the casting machine. 10 The interlocking mechanism includes a first gear rotated by the actuating means, a second gear meshing with the first gear, and the second gear.
a pair of third gears that mesh with the gears in the diametrical direction and are prevented from moving in the axial direction;
A cylindrical part consisting of parallel shafts of the book, in which the biasing means fit the ends of the two shafts, a pressing plate in contact with the end of the crucible holder, and a spring interposed in the cylindrical part. A centrifugal casting machine according to claim 9, comprising: 11 The upper surface of the frame is fixed to the upper end of a vertical rotating shaft that is rotated by a drive source, and at both ends of a penetrating shaft that passes through the frame at a position lower than that and perpendicular to the rotating shaft. a support block supporting and fixed to one side of the frame at a position outwardly spaced therefrom; and a support block located inwardly of the support block and movable in the horizontal direction via a first guide means. a crucible holder which is supported by the support block and clamps the mold between the crucible holder and the support block when the crucible holder moves, and a second guide means is provided on the other side of the frame at a position outwardly away from the crucible holder. a balance weight supported so as to be movable in the horizontal direction; and an actuating means that is rotated by a handle operation to move the weight in the horizontal direction; A centrifugal casting machine characterized by being provided with an interlocking mechanism for horizontally moving a crucible receiver by an operating means.