JP2002153963A - Core setter in centrifugal casting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a cycle time for casting a tube by quickly performing the fitting and the taking-out of a core to a metallic mold in a centrifugal casting apparatus. SOLUTION: A core setter 23 for fitting the core 5 for forming the inner peripheral surface of the tube having a receiving hole at the one end into the metallic mold 1 for centrifugally casting this tube, is provided with a core ring 24 holding the core 5 and a setter part 25 which supports this core ring 24 and can approach or separate to the tube receiving hole forming part of the metallic mold 1. This setter part 25 is constituted so that the core ring 24 is connectably/releasably and freely rotatably supported on the setter part 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a core setter for a centrifugal casting machine.

[0002]

2. Description of the Related Art FIG. 9 shows a known apparatus for centrifugally casting ductile iron pipes. here,
Reference numeral 1 denotes a centrifugal casting frame which is supported on a driven roller 2 in a horizontal direction so that it can rotate around its axis 3 at a high speed. In general, the ductile cast iron pipe has a receiving port having a larger diameter than the pipe body at one end, and accordingly, the metal frame 1 also has a receiving port having a larger diameter than the other portion at one end thereof. A part 4 is provided.

Further, the inner peripheral surface of a receiving port of a ductile cast iron pipe generally has a complicated shape. In order to form the inner peripheral surface of such a receiving port, a sand core as shown in FIG. That is, the core 5 is used. The core 5 is formed in a cylindrical shape, and has an uneven portion 6 on its outer periphery for forming an inner periphery of the receiving port. And this core 5
Is supported by the core ring 7 by being fitted into the core ring 7 of the core setter, and is inserted into the socket forming portion 4 of the metal frame 1 by mounting the core ring 7 on the metal frame 1. And are set concentrically. The core ring 7 supporting the core 5 is attached to a setter part (not shown) of the core setter, and the core 5 is inserted into the socket forming part 4 by moving the setter part toward the metal frame 1. It is configured so that it can be set.

[0004] As a method for setting the core ring 7 in the socket forming section 4 of the metal frame 1, the core ring 7 is pressed against the socket forming section 4 by hydraulic pressure, or the core ring 7 is formed with a hook by the hook. Some are fixed to the part 4. After the setting, the setter section is separated from the coring 7 and away from the metal frame 1, so that the rotation operation of the metal frame 1 is not hindered.

Then, the metal frame 1 on which the core 5 is set is rotated at high speed around the axis 3 by the rollers 2, and in this state, the molten metal 8 is supplied into the metal frame 1 as shown in the figure. As a result, a tube in which the inner periphery of the receiving port 9 is formed in a predetermined shape by the core 5 is centrifugally cast. After the casting is completed, the setter portion approaches the metal frame 1 to receive the core ring 7, and the core ring 7 is moved away from the metal frame, whereby the core is removed from the formed cast iron tube.

[0006]

However, in such a conventional configuration, the core ring 7 supporting the core 5 is moved from the setter to the metal frame 1 while the metal frame 1 is stopped without rotating. After casting, after the rotation of the metal frame 1 is completely stopped, the setter portion is moved closer to the metal frame 1 to remove the core ring 7 from the metal frame. Must be received before the start of rotation of the metal frame 1 and after the complete stop.

More specifically, as a method for setting the core 5 on the metal frame 1, there are a method of pressing with the hydraulic pressure and a method of fixing with the hook as described above. Vibration is likely to occur and abnormalities such as cracking of the core are likely to occur. Therefore, although the core 5 can be attached and detached even while the metal frame 1 is rotating, actually, the rotation of the metal frame 1 is stopped or at a very low speed. It has to be removed during rotation. In the case of fixing with a hook, the opening and closing operation of the hook cannot be performed unless the rotation of the metal frame 1 is completely stopped.

That is, conventionally, as shown in FIG. 10, if the previous casting tube was pulled out of the metal frame 1 in step 100, the metal frame 1 was rotated as shown in step 101,
As shown in step 102, a predetermined coating is applied to the inner surface of the metal frame 1, and when this coating operation is completed, the rotation of the metal frame 1 is temporarily stopped as shown in step 103. Then, with the metal frame 1 stopped rotating, the core 5 is set on the metal frame 1 as shown in step 104. Then, step 105
As shown in (1), the metal frame 1 is rotated again, and as shown in step 106, the molten metal is supplied to cast the pipe. Next, after stopping the rotation of the metal frame 1 as shown in step 107, the core 5 is removed from the metal frame 1 as shown in step 108, and finally the cast tube is removed as shown in step 109. Pulled out from frame 1.

For this reason, conventionally, it takes a considerable time to attach the core 5 to the metal frame 1 and detach the core 5 from the metal frame 1, and as a result, a cycle for casting one cast iron pipe is required. There is a technical problem that the time is long.

Accordingly, the present invention solves such a technical problem, and enables quick attachment and detachment of a core to and from a metal frame of a centrifugal casting apparatus, thereby shortening a cycle time for casting a pipe. The purpose is to be able to.

[0011]

According to the present invention, a core for forming an inner peripheral surface of a tube having a socket at one end is mounted on a metal frame for centrifugally casting the tube. A core setter for causing a core ring to hold the core, and a setter portion that can support or close the core ring and move closer to or away from the tube receiving portion forming portion of the metal frame, The setter section is configured to connect and release the core ring to the setter section and to rotatably support the core ring.

With such a configuration, since the setter portion rotatably supports the core ring, it is possible to set the core on the metal frame and rotate the metal frame when the metal frame is rotating. While it is possible, the rotating core can be removed from the metal frame when the metal frame has not completely stopped rotating, so there is no need to wait for the metal frame to stop rotating, The cycle time for manufacturing a cast iron tube can be reduced.

Further, according to the present invention, a core for forming an inner peripheral surface of a receiving port at one end of a pipe is mounted on a core setter having the above-described structure, and the core setter is held close to a metal frame to hold the core. After setting the core ring rotatably supported by the setter part on the rotating metal frame and hanging it around, move the setter part away from the metal frame to release the core ring from this setter part and cast Bring the setter part closer to the rotating metal frame after completion, support and connect the core ring rotating integrally with the metal frame in a rotating state by this setter part, and keep this setter part away from the metal frame This causes the coring to be released from the metal frame.

[0014] In this way, similarly, when the metal frame is rotating, the core can be set and rotated around the metal frame, and the state where the metal frame has not completely stopped rotating can be achieved. Sometimes, the rotating core can be removed from the metal frame, so that no waiting time is required for the metal frame to stop rotating, and the cycle time for the production of cast iron tubes can be reduced.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes a centrifugally cast metal frame, and 4 denotes a receiving port forming portion, which have the same structure as that shown in FIG. Receptacle forming section 4 in this metal frame 1
The lock device 11 is provided at a plurality of positions along the circumferential direction in the portion of the open end. Each lock device 1
1 has a lock lever 13 whose center is rotatably supported by a support shaft 12 in the tangential direction of the metal frame 1, and a weight 15 is attached to one end 14 of the lock lever 13. A lock claw 17 is formed at the tip of the other end 16 of the lock lever 13. The lock claw 17
It is provided so as to protrude from the metal frame 1 in the axial direction.

The lock lever 13 is arranged such that the weight 15, that is, the one end 14, swings radially outward away from the metal frame 1 by centrifugal force acting on the weight 15 when the metal frame 1 rotates. It is rotatable around the support shaft 12. At this time, the other end 1 of the lock lever 13
6, ie, the lock pawl 17 swings radially inward toward the metal frame 1. The lock lever 13 swings radially outward in a direction in which the weight 15 or one end 14 is separated from the metal frame 1 by a torsion coil spring 18 provided around the support shaft 12, and the lock claw 17 or other end 16 Is applied in a direction in which it swings inward in the radial direction approaching the metal frame 1.

The lock claw 17 has a first inclined surface 20 in a direction approaching the center of the metal frame 1 as the metal frame 1 is approached.
And a second inclined surface 21 extending away from the center of the metal frame 1 as it approaches the metal frame 1.
Is formed at a position farther from the metal frame 1 than the second inclined surface 21 is. In a state where the lock lever 13 is held in the above-mentioned swinging posture by the torsion coil spring 18 as shown in FIG. 1, the first inclined surface 20 is relatively inclined with respect to the central axis of the metal frame 1. Is loose,
Conversely, the second inclined surface 21 is formed such that the inclination is relatively steep.

In FIG. 1, reference numeral 23 denotes a core setter, which has a core ring 24 for holding the core 5 in a state of being fitted in the cylindrical core 5 and a setter portion 25 for supporting the core ring 24. .

The setter section 25 has an arm 26 arranged in a direction orthogonal to the axis of the metal frame 1 and a cylindrical section 27 provided at the tip of the arm 26. The arm 26 is
It is possible to move in the direction of the axis of the metal frame 1 to approach or move away from the metal frame 1. The cylindrical part 27 is the metal frame 1
A ring body 28 is rotatably supported by a bearing 29 on the outer periphery of the front end on the side of the metal frame 1. On the outer periphery of the tip of the ring body 28,
A tapered tapered surface 30 is formed. Cylindrical part 27
Is provided with a clamp device 31. The clamp device 31 is formed by a cylinder device.
And a clamp claw 32 that opens and closes in the radial direction.

The core ring 24 is configured to be attachable to the metal frame 1 and holds a core 5.
It has an outer fitting portion 34 that can be put on the ring body 28 of the setter portion 25 and a cylindrical insertion portion 35 that can be inserted into the cylindrical portion 27 of the setter portion 25. A ring body 37 is rotatably supported by a bearing 36 at the distal end of the insertion section 35. A flange 3 that can be axially engaged with the outer periphery of the distal end of the ring body 37 by the clamp claw 32 of the clamp device 31.
8 are formed.

A flange 39 is formed on the outer periphery of the outer fitting portion 34. A first tapered surface 40 is formed on the outer periphery of an end of the flange 39 on the side of the metal frame 1, and a second tapered surface 4 is formed on the outer periphery of an end on the opposite side.
1 is formed. A tapered surface 42 that is externally fitted to the tapered surface 30 of the ring body 28 is formed on the inner periphery of the outer fitting portion 34.

In such a configuration, when casting a pipe, as shown in FIG. 1, the core ring 24 holding the core 5 is set in the setter portion 25 at a position away from the metal frame 1 in advance. Keep it. At this time, the tapered surface 42 of the outer fitting portion 34 is
By covering the tapered surface 30 of No. 8, the core ring 24 becomes
It is set concentrically with the setter section 25. At this time, the clamp device 31 of the setter portion 25 is closed and the clamp claw 32 is moved to the ring body 3 of the core ring 24.
7 to the flange 38.

In this state, since the clamp pawl 32 is engaged with the ring body 37 of the core ring 24,
It is connected to the setter section 25, and is setter 2 by a bearing 29 and a bearing 36.
5 is rotatable. That is, the ring body 3
7 is fixed to the clamp device 31 because it is engaged with the clamp claw 32.
Is rotatable with respect to the insertion portion 35 of the core ring 2.
Reference numeral 4 is concentrically connected to the setter portion 25 so as to be rotatable with respect to the setter portion 25.

In this state, the setter section 25 is moved in a direction approaching the metal frame 1 as shown in FIG. Then, as shown in FIG.
The lock claw 1 of the lock lever 13 whose tapered surface 40 is held in a predetermined posture by the spring 18 in the metal frame 1
7, the first inclined surface 20 having a relatively gentle inclination is pushed outward to displace the other end 16 of the lock lever 13, that is, the lock claw 17 in the opening direction. Thereby, the flange 39 can pass through the position of the lock claw 17.

When the flange 39 passes, as shown in FIG. 3, the lock claw 17 swings in the closing direction again by the force of the spring 18 and the second inclined surface 21 is moved to the second position of the flange 39.
Is pressed. At this time, the coring 24
Is mounted on the metal frame 1 with the core holding portion 33 in contact with the metal frame 1. Also, at this time, the second
Since the inclined surface 21 is relatively steep, the force of the spring 18 acts to firmly press the flange 39, that is, the core ring 24 in the direction of the metal frame 1.

Further, since the core ring 24 and the core 5 are mounted on the metal frame 1 in this manner, when the metal frame 1 is rotating without being completely stopped, the bearing 2
While being rotatably supported by the setter unit 25 by the components 9 and 36, the unit 9 rotates integrally with the metal frame 1 by swiveling. Moreover, since the metal ring 1 is rotatably supported by the setter portion 25 by the bearings 29 and 36, the core ring 24, that is, the core 25 is mounted on the metal frame 1 without any trouble when the metal frame 1 is rotating. Can be done.

When the core ring 24 has been mounted on the metal frame 1, the clamp claws 32 are indicated by phantom lines in FIG.
Is opened to release the state where the ring body 37 is clamped, and in this state, the setter portion 25 is moved in a direction away from the metal frame by the arm 26 as shown in FIG. Then, the core 5 and the core ring 24 remain in the metal frame 1 while being held by the lock claws 17, and only the setter portion 25 moves away from the metal frame 1.

At this time, even if the high speed rotation of the metal frame 1 for centrifugal casting is started without waiting for the setter portion 25 to move away from the metal frame 1, or before the setter portion 25 starts moving. Even when the high-speed rotation of the metal frame 1 is started, no problem arises because the setter portion 25 and the core ring 24 can freely rotate with each other by the bearings 29 and 36. Therefore, the high-speed rotation of the metal frame 1 can be started at an early stage, and the cycle time for manufacturing the cast iron pipe can be shortened.

The mold 1 is, for example, 1000 rpm.
By performing the rotation at a high speed, a large centrifugal force acts on the weight 15 of the lock lever 13, and the lock claw 17 presses the coring 24 with a strong force via the steep slope 21,
As a result, the core ring 24 and the core 5 are securely mounted on the metal frame 1, and under this state, the molten metal 43 is supplied into the metal frame 1 as shown in FIG. The molten metal 43 is cooled by the mold 1 and solidified, whereby a cast iron pipe is manufactured. At this time, since the setter portion 25 is separated from the core ring 24, that is, the metal frame 1, there is an advantage that vibrations and the like when the mold 1 rotates at a high speed are not transmitted.

When the melt 43 has solidified, the setter 25
To the frame 1 again. Then, as shown in FIG. 6, the ring body 28 enters the inside of the outer fitting portion 34 of the core ring 24, and the tapered surfaces 30, 42 come into contact with each other. With the metal frame 1 not yet stopped, the ring 2
When the ring 8 is inserted into the inside of the outer fitting portion 34, the ring 28 is thereby twisted.
Is supported by the bearing 29, no rotational force is transmitted to the cylindrical portion 27 and the arm 26, so that no problem occurs.

When the ring body 28 enters the inside of the outer fitting portion 34 of the core ring 24 as described above, the clamp device 31 is closed to move the clamp claws 32.
The ring body 37 is clamped by the above, and the clamp claw 32 can be engaged with the flange 38. At this time, the rotation of the ring body 37 is stopped by being clamped. However, since the ring body 37 is rotatably supported by the insertion portion 35 by the bearing 36, the rotational force from the insertion portion 35 is transmitted. Therefore, no problems arise as well.

As described above, even when the metal frame 1 has not stopped rotating after centrifugal casting, the setter portion 25 can be connected to the coring 24, and the metal frame 1
Since there is no need to wait for the rotation of the metal frame 1 to completely stop, it is possible to contribute to shortening of the cycle time as in the case of starting the rotation of the metal frame 1.

When the setter portion 25 is connected to the core ring 24, regardless of whether the metal frame 1 is rotating or not.
The arm 26 moves the core setter 23 in a direction away from the metal frame 1. Then, the second tapered surface 41 of the flange 39 of the core ring 24 presses the second inclined surface 21 of the lock claw 17, and becomes smaller due to the force of the spring 18 and a decrease in the rotation speed of the metal frame 1 after centrifugal casting. By opening the lock pawl 17 against the centrifugal force of the weight 15, the core 5 and the core setter 23 are separated from the mold 1 as shown in FIG.

Specifically, when the rotational speed of the metal frame 1 decreases to a certain degree, for example, about 600 rpm, the core 5 and the core setter 23 can be separated from the mold 1 at that point. Therefore, the core 5 and the core setter 23 can be detached from the mold 1 while cooling the tube while rotating the metal frame 1 after casting. Setter 23
The pipe can be pulled out without detaching the pipe, and the work efficiency can be improved.

FIG. 8 shows a flow of a casting method according to the present invention. That is, if the previous casting tube was pulled out of the metal frame 1 in step 80, the rotation of the metal frame 1 is started as shown in step 81, and a predetermined coating is applied to the inner surface of the metal frame 1 as shown in step 82. When the coating operation is completed, the core 5 is set as shown in step 83 without stopping the rotation of the metal frame 1. Then, the metal frame 1 is rotated at a high speed to perform casting as shown in step 84. Thereafter, in a state where the metal frame 1 is still rotating, the core 5 is removed as shown in step 85, and thereafter, the rotation of the metal frame 1 is stopped as shown in step 86, and the process proceeds to step 87. The thus cast tube is pulled out of the metal frame 1.

[0036]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a centrifugal casting apparatus for casting a tube having a diameter of 250 mm and a length of 5 m, the cycle time for casting a single tube is 45 seconds in the conventional method. The method of the present invention requires only 30 seconds, and can reduce the time by 15 seconds.

[0037]

As described above, according to the present invention, the core setter moves the core ring that holds the core and the core ring toward and away from the tube receiving portion forming portion of the metal frame while supporting the core ring. Since the setter portion is configured to connect and releasably support and rotatably support the core ring with respect to the setter portion, the setter portion is provided. Since the core ring is rotatably supported, the core can be set and rotated around the metal frame while the metal frame is rotating, and the metal frame completely stops rotating. The rotating core can be removed from the frame when it is not present, which eliminates the waiting time for the frame to stop rotating and reduces the cycle time for the production of cast iron tubes. It is possible.

[Brief description of the drawings]

FIG. 1 is a sectional view of a core setter of a centrifugal casting apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view showing the next operation stage of FIG. 1 by the core setter.

FIG. 3 is a sectional view showing a next operation stage of FIG. 2 by the core setter.

FIG. 4 is a sectional view showing the next operation stage of FIG. 3 by the core setter.

FIG. 5 is a sectional view showing the next operation stage of FIG. 4 by the core setter.

FIG. 6 is a sectional view showing the next operation stage of FIG. 5 by the core setter.

FIG. 7 is a sectional view showing the next operation stage of FIG. 6 by the core setter.

FIG. 8 is a flowchart of a centrifugal casting method according to the present invention.

FIG. 9 is a sectional view of a core setter of a conventional centrifugal casting device.

FIG. 10 is a flowchart of a conventional centrifugal casting method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Centrifugal casting metal frame 4 Port forming part 5 Core 23 Core setter 24 Coring 25 Setter part 29 Bearing 31 Clamping device 36 Bearing

Claims (2)

[Claims] 1. A core setter for mounting a core for forming an inner peripheral surface of a receiving port at one end of a tube to a metal frame for centrifugally casting the tube, the core holding the core. A ring, and a setter portion which supports the core ring and can be moved closer to or away from the tube receiving portion forming portion of the metal frame, and the setter portion has the core ring with respect to the setter portion. A core setter for a centrifugal casting apparatus, wherein the core setter is configured so as to freely and freely connect and rotatably support the core. 2. A core for forming an inner peripheral surface of a receiving port at one end of a pipe is attached to the core setter according to claim 1,
By bringing the core setter closer to the metal frame, the core ring holding the core and rotatably supported by the setter portion is set on the rotating metal frame and rotated, and then the setter portion is moved to the metal frame. Release the coring from the setter part by moving away from the setter part, bring the setter part closer to the rotating metal frame after casting, and support the core ring rotating integrally with the metal frame in a rotating state by this setter part A core ring in the centrifugal casting apparatus, wherein the core ring is detached from the metal frame by moving the setter portion away from the metal frame.