JPH0247307B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention provides a method for forming a core at the open end of a centrifugal casting mold.
This invention relates to a core setter in a centrifugal casting machine for installing.

Structure of the conventional example and its problems When manufacturing a cast pipe by centrifugal casting, it is necessary to set a core for forming the inner surface of the socket of the pipe at the open end of a centrifugal casting mold. For this reason, conventionally, as shown in Japanese Patent Publication No. 49-18694, the core is held at the tip of an arm that moves toward and away from the open end of the centrifugal casting mold in the axial direction of the mold. The front lid is configured to support the lid, and when the front lid is attached to the mold, the front lid is cut into an arm and rotates at high speed together with the mold, and a centrifugal weight attachment is used to hold the front lid on the mold. A device equipped with a stop has been proposed. However, the locking device with a centrifugal force weight does not function unless the mold rotates and centrifugal force is applied. The drawback is that the lid cannot be held securely.

In order to overcome this drawback, a method has been proposed in which a magnet is used to temporarily hold the front cover when the mold is stopped, as shown in Japanese Patent Publication No. 52-894, for example. In this case as well, there is a problem in that the locking tool is not locked to the front cover when the mold is stopped, and temporary holding using a magnet is still insufficient.

OBJECT OF THE INVENTION Therefore, an object of the present invention is to enable the front cover to be held securely even when the mold is stopped.

Structure of the Invention In order to achieve the above object, the present invention includes an arm movable toward and away from the open end of a centrifugal casting mold in the axial direction of the mold, and a proximal end of the arm disposed along the arm. a pair of levers that are swingable around the arm in the direction of movement of the arm; a pair of annular supports that are provided facing each other at the tips of the levers and are biased away from each other; A rotary body extending in the mold axis direction that is penetrated between the bodies and supported by both supports by the urging force acting on both supports, and a rotary body provided at an end of the rotary body and capable of holding the core. and a front cover that can be fitted to the open end of the mold by movement of the arm; and a plurality of front covers provided around the open end of the mold, which rotate when the front cover is fitted to the open end. an engaging member that is biased to engage with and can hold the rotating body in the mold; and an engaging member that is attached to the tip of the lever and that comes into contact with the engaging member while the arm is moving to engage the rotating body. a pushing ring for retracting the member from a moving path of the rotating body; movement of the arm abuts a lever portion on a proximal end side of the pushing ring and swings the lever; The present invention includes a stopper that causes the supports to approach each other to separate the supports and the rotating body, and to separate the push ring from the engagement member.

Therefore, since the engaging member is biased to engage with the rotating body, the front cover can be held securely even when the mold is stopped, and the push ring can be used when the front cover is attached or removed. Since the engaging member can be retracted from the moving path of the rotating body by the action of Since it is attached to the lever and is interlocked with the above-mentioned connection and release operations, there is no need for a separate mechanism for operating the push ring, and the structure can be simplified and the number of parts can be reduced.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 2 and 3, reference numeral 1 denotes a horizontal centrifugal casting mold, which is capable of casting a cast iron pipe 2. As shown in FIG. Reference numeral 3 designates an arm, whose base end 4 is connected to a cylinder device 5, and is movable towards and away from the open end 6 of the mold in the mold axial direction (horizontal direction). Reference numeral 7 denotes a swing drive device for the arm 3, which is interlocked with the connecting shaft 8 portion between the cylinder device 5 and the base end portion 4, and rotates the connecting shaft 8 around its axis to rotate the tip of the arm 3. As shown in FIG. 3, it is configured to swing between a mold axis position 9 and a position 10 off the mold axis.

At the tip of the arm 3, there is a rotating body 11 in the mold axis direction.
A core 1 is provided at both ends of the rotating body 11.
a pair of front lids 1 that are attached to and detached from the open end 6 of the mold 1 by holding the front lid 2 and moving the arm 3 in the mold axial direction;
3A and 13B are provided. Further, the arm 3 is rotatable around its axis, and a rotation drive device (not shown) for this purpose is provided at the base end 4.

Next, the arm 3 and its surroundings will be explained in detail based on FIG. Reference numeral 14 denotes a cylindrical fixed arm body, within which a rotating shaft 15 is supported. A pair of levers 16A and 16B are provided on the outside of the arm body 14 in the moving direction of the arm 3, that is, in the mold axis direction.
The levers 16A, 16B are attached to a ring 17 rotatably fitted around the arm body 14 near the proximal end 4 of the arm 3.
8 are swingably connected. Lever 16A,
The swinging direction of 16B matches the moving direction of arm 3.

Annular supports 19A, 19B facing each other are fixed to the tips of each lever 16A, 16B,
Both supports 19A and 19B are concentrically engaged with openings at both ends of an annular body 20 attached to the tip of the rotating shaft 15 in the axial direction of the mold. That is, as shown in FIGS. 4 to 6,
Engagement protrusions 21 are formed at both ends of the annular body 20,
On the other hand, engagement protrusions 21 are provided on both supports 19A and 19B.
Other engaging protrusions 22A, 22B are formed to engage with the annular body 20 and the supports 19A, 19B.
and can be moved relative to each other in the axial direction within a certain range. A compression coil spring 23 is interposed between the supports 19A and 19B to urge the supports apart from each other.

The rotating body 11 includes a cylindrical portion 24 that passes through the insides of the supports 19A and 19B, and a cylindrical portion 2.
Front cover mounting plates 25A, 25 attached to both ends of 4
The front lids 13A, 13B are attached to the ends of the front lid attachment parts 25A, 25B. A pair of opposing tapered surfaces 26A and 26B are formed on the outer periphery of both ends of the cylindrical portion 24, and the supporting body 1
Other tapered surfaces 27A and 27B corresponding to the tapered surfaces 26A and 26B are formed on 9A and 19B. Therefore, the supports 19A and 19B are the springs 2
3, the tapered surfaces 26A, 27A and the tapered surfaces 26B, 27B are pressed against each other as shown in FIGS. 19B
It will be supported by

A plurality of engaging members 29 are provided in the circumferential direction around the periphery of the open end 6 of the mold 1 in the centrifugal casting machine 28 . As shown in FIGS. 4 to 6, each engaging member 29 is swingable around a pin 30, and is integrally formed with a centrifugal weight 31 that opens and opens as the mold 1 rotates. There is. Also, in Figure 1,
A torsion coil spring 32 is fitted around the pin 30 and urges the centrifugal weight 31 to open. An annular engagement ring 33 is provided at the base end position of the front lid attachment portions 25A, 25B, and each engagement member 29 includes:
An engagement protrusion 34 that can engage with the engagement ring 33 is integrally formed inside the pin 30.

At the tips of the levers 16A, 16B, push rings 35A, 35B are provided integrally with supports 19A, 19B. This push ring 35A, 35B
has a structure in which a protrusion is erected on the periphery of the disc, which contacts the centrifugal force weight 31 of the engagement member 29 to close the centrifugal force weight 31, thereby causing the engagement protrusion 34 to close. It is possible to separate it outward from the engagement ring 33.

Openings 36 are provided in the levers 16A and 16B on the proximal end 18 side of the push rings 35A and 35B.
A, 36B are formed, and stopper rings 37A, 37B are attached around the openings 36A, 36B. In FIG. 1, the stopper ring 37
There is a stopper 3 in the 28 part of the centrifugal casting machine corresponding to A.
8 is provided. This stopper 38 includes a first stopper bolt 40 that is attached to the centrifugal casting machine 28 and whose tip end 39 abuts the stopper ring 37A, and a first stopper bolt 40 that is attached to the tip of the first stopper bolt 40 and passes through the opening 36A to the arm body. 14, and a second stopper bolt 41 that comes into contact with the second stopper bolt 41. Note that the first stopper bolt 40 is
The amount of screwing out from the centrifugal casting machine 28 can be adjusted, and the position of contact with the stopper ring 37A can be adjusted. Also, the second stopper bolt 41
The amount of screwing out from the first stopper bolt 40 can be adjusted, and the position of contact with the arm body 14 can be adjusted.

In such a configuration, the front lid 1 with the core 12
3A to the mold 1, first rotate the rotating shaft 15 of the arm 3, and then rotate the supports 19A, 19B, the rotating body 11, the levers 16A, 16B, etc. together around the axis of the arm body 14. Move the front cover 13A
are opposed to the open end 6 of the mold 1. At this time, the arm 3 is made to correspond to the mold axis position 9 in FIG.

Next, the cylinder device 5 is operated to bring the arm 3 closer to the mold 1. Then, by appropriately adjusting the amount of screwing out of the first stopper bolt 40 from the centrifugal casting machine 28, before the stopper ring 37A comes into contact with the tip 39 of the first stopper bolt 40, as shown in FIG. The push ring 35A contacts the centrifugal weight 31 of the engagement member 29, and gradually closes the centrifugal weight 31 against the spring 32. Then, the engaging member 29 is rotated around the pin 30,
The engagement protrusion 34 is moved radially outward of the mold 1. As a result, the engaging protrusion 34 is attached to the front lid mounting portion 25A.
That is, the engagement ring 33 is retracted from the movement path of the engagement ring 33, and the engagement ring 33 passes through the engagement protrusion 34 position.

As described above, by appropriately setting the amount of screwing out of the first stopper bolt 40 from the centrifugal casting machine 28, the stopper ring 37A comes into contact with the tip 39 of the first stopper bolt 40 at this point, and the stopper ring 37 does not move any further. You will not be able to move. However, since arm 3 still continues to move, lever 16
The proximal end 18 of A further approaches the centrifugal caster 28. As a result, the push ring 35A provided at the tip end of the lever 16A begins to move away from the mold 1, as shown in FIG. As a result, as shown in FIG.
The engagement protrusion 34 of 9 engages with the engagement ring 33.
At the same time, the tapered surfaces 26A and 27A are separated from each other, and the rotating body 11 and the support body 19A are separated.

When arm 3 moves further, annular body 2
The engagement protrusion 21 of 0 is the engagement protrusion 22 of the support body 19B.
B, thereby causing the lever 16B to swing against the spring 23. As a result, the tapered surface 26
B and 27B are spaced apart from each other, and the rotating body 11 is also separated from the support body 19B. Thereafter, as shown in FIG. 1, the arm body 14 comes into contact with the second stopper bolt 41, and at this point the arm 3 stops moving. Then, the rotating body 11 is moved to the supports 19A, 19
The edge is completely cut off from B and the push ring 35A
is separated from the engaging member 29, and the front lid attachment part 25A is attached to the mold 1 by the engaging member 29, and the front lid 1 is attached to the mold 1 by the engaging member 29.
3A is held in the mold 1.

In this state, when the mold 1 is rotated at high speed and melt is poured into the mold 1, the front lid 13A is strongly held in the mold 1 by the action of the centrifugal weight 31 of the engaging member 29, and the thrust force of the molten metal is reduced. While being received, the cast iron pipe 2 is formed as shown in FIG.

Once the cast iron pipe 2 is formed, the arm 3 is moved away from the mold 1. Then, the front lid 13A is removed from the mold 1 by an operation opposite to that described above. Therefore, as shown in FIG. 3, the arm 3 is swung and moved to a position 10 away from the axis of the mold.
The arm 3 is then rotated around its axis to direct the front cover 13B upward. The front lid 13B is cooled and cleaned during the casting operation using the front lid 13A, and a new core 12 is attached to the front lid 13B, and the above-mentioned cycle is repeated. The cast iron pipe 2 is pulled out from the mold 1 while the core 12 is being attached and is transported out.

In addition, in the above, a pair of front lids 13A, 13B are provided at both ends of the rotating body 11, and both front lids 13 are provided by rotating the arm 3 around its axis.
Although the example uses A and 13B alternately,
The front cover may be provided only on one end side of the rotating body 11, and in that case, it is not necessary to rotate the arm 3 around its axis.

Effects of the Invention As described above, according to the present invention, since the engaging member is biased to engage with the rotating body, the front cover can be reliably held even when the mold is stopped. , and when the front cover is attached or detached, the engagement member can be retracted from the movement path of the rotating body by the action of the push ring, so the front cover can be attached or detached without any trouble, and the push ring is connected to the support body and the rotating body. Because it is attached to a lever for connecting and releasing the body and is linked to the above-mentioned connecting and releasing operations, there is no need for a separate mechanism to operate the push ring, resulting in a simple structure and a reduced number of parts. This makes it possible to reduce the

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a sectional view of a main part thereof, FIG. 2 is an overall plan view, FIG. 3 is a side view, and FIGS. 4 to 6 are explanatory views of the operation. DESCRIPTION OF SYMBOLS 1... Centrifugal casting mold, 3... Arm, 4... Base end, 6... Open end, 11... Rotating body, 12...
Core, 13A, 13B...Front lid, 16A, 16B
... Lever, 19A, 19B ... Support, 25
A, 25B...Front lid attachment part, 28...Centrifugal casting machine, 29...Engagement member, 31...Centrifugal weight, 35
A, 35B... Push ring, 38... Stopper,
40...First stopper bolt, 41...Second stopper bolt.

Claims (1)

[Claims] 1. An arm movable toward and away from the open end of a centrifugal casting mold in the axial direction of the mold; a pair of levers that are swingable in the direction of movement of the levers; a pair of annular supports that are provided opposite to each other at the tips of the levers and that are biased away from each other; a rotating body in the mold axis direction supported by both supports by the biasing force acting on both supports; a front cover that can be moved to fit into the opening end of the mold; and a plurality of front lids provided around the periphery of the opening end of the mold so as to engage with the rotating body when the front lid is fitted into the opening end. an engaging member that is biased and capable of holding the rotating body in the mold; and an engaging member that is attached to the tip of the lever and that comes into contact with the engaging member during movement of the arm so that the engaging member holds the rotating body in place. a pushing ring to be evacuated from the path; and movement of the arm abuts a lever portion on the proximal end side of the pushing ring to swing this lever, and the swinging of the lever causes the two supports to approach each other. A core setter for a centrifugal casting machine, comprising a stopper for separating the supporting body and the rotating body and for separating the pushing ring from the engaging member.