JP4090196B2 - Core setter in centrifugal casting equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a core setter in a centrifugal casting apparatus.
[0002]
[Prior art]
A centrifugal casting apparatus is known in which a cast iron pipe is centrifugally cast by supplying molten metal to a casting machine having a horizontal metal frame that rotates at high speed around an axis. In this type of centrifugal casting apparatus, a sand core, that is, a core is attached to the casting machine during casting in order to finish the inner peripheral surface of the receiving port formed at one end of the tube into a desired shape. This core is supported by a core setter with a movable arm structure, and is transported from the core receiving position outside the machine to the position of the tube receiving portion in the centrifugal casting machine, and is attached to the forming portion of the tube receiving port. Is done.
[0003]
On the other hand, as a centrifugal casting apparatus, two centrifugal casting machines are provided side by side, and by allowing molten metal to be supplied to these two centrifugal casting machines at the same time, two pipes can be cast simultaneously. A centrifugal casting apparatus provided with a so-called double centrifugal caster is known. In the centrifugal casting apparatus provided with this double-type centrifugal casting machine, a core setter is provided for each casting machine, and each core setter is individually controlled and operated so that each core is individually controlled. Is attached and detached.
[0004]
[Problems to be solved by the invention]
However, the core setter of the arm structure is a heavy structure because the core is supported by the cantilever structure. In addition, each core setter provided corresponding to each of the two centrifugal casting machines oscillates independently, and the mounting direction of the core differs for each core setter due to restrictions on the placement of the casting machine. Therefore, two control devices and two drive devices are required.
[0005]
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve such a technical problem and to make the core setter of a centrifugal casting apparatus light in weight and having a simple configuration of control means and drive means.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the present invention provides a centrifugal casting apparatus in which two centrifugal casting machines for centrifugally casting a tube are provided side by side, and a core is mounted on a tube receiving portion forming part of each centrifugal casting machine. First and second core holding devices are provided corresponding to the centrifugal casting machines, respectively, and the first and second core holding devices are connected to each other, so that the core receiving position outside the machine is provided. And the position of the tube receiving portion forming portion in each centrifugal casting machine are configured to be integrally movable, and the first and second core holding devices are provided for the tube receiving port in each centrifugal casting machine. When the core is attached to the forming portion, the core is configured to be movable relative to each other along the axial direction of the centrifugal casting machine.
[0007]
With such a configuration, by connecting the core holding devices provided corresponding to each centrifugal casting machine to each other, the rigidity can be improved, and the weight can be reduced. Since the core holding device is configured so as to be movable integrally, it is possible to easily synchronize both of them, and therefore, it is possible to easily configure the control means and the drive means. In addition, since both core holding devices are configured to be movable relative to each other along the axial direction of the centrifugal casting machine when the core is mounted on the tube receiving port forming portion in each centrifugal casting machine, By absorbing the difference in thermal expansion of the metal frame in the machine, the core can be securely attached to each casting machine.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In the centrifugal casting apparatus shown in FIGS. 3 to 5, reference numerals 11 and 12 denote a pair of centrifugal casting machines, which are provided on the casting carriage 13 and each have a horizontal metal frame that rotates at high speed. Reference numeral 14 denotes a tube receiving portion in each of the centrifugal casting machines 11 and 12. Corresponding to the tube receptacle forming portions 14 and 14 in the centrifugal casting machines 11 and 12, a core setter 15 is provided.
[0009]
Specifically, the pair of side walls 16 and 16 of the casting carriage 13 are provided with mounting plates 17 and 17, respectively, and each mounting plate 17 has a cylinder device 18 that expands and contracts in the axial direction of the casting machines 11 and 12. Each is provided. A movable frame 19 is connected to the telescopic end of each cylinder device 18 at a position on the side of the casting machines 11 and 12. In addition, a pair of guide bars 20, 20 arranged along the axial direction of the casting machines 11, 12 is provided on the side of each cylinder device 18, and these guide bars 20, 20 are respectively attached by support members 21. The plate 17 is slidably supported. The tip of each guide bar 20 is fixed to the moving frame 19. Therefore, each moving frame 19 is configured to reciprocate along the axial direction of the casting machines 11 and 12 while being guided by the guide bar 20 when the cylinder device 18 expands and contracts.
[0010]
First rotary actuators 24 and 24 having horizontal rotation axes perpendicular to the rotation axes of the casting machines 11 and 12 are attached to the distal ends of the moving frames 19, respectively. And the base end part of the turning arms 25 and 25 is attached to the rotating shaft of each rotary actuator 24 and 24, respectively. These turning arms 25 and 25 can turn in a range of about 270 degrees, for example, by the rotation of the rotary actuators 24 and 24.
[0011]
Second rotary actuators 26 and 26 having rotation axes in the same direction as the first rotary actuators 24 and 24 are attached to the distal ends of the respective swing arms 25. Then, core holding devices 27 and 28 corresponding to the centrifugal casting machines 11 and 12 are attached to the rotation shafts of the second rotary actuators 26 and 26, respectively. These core holding devices 27 and 28 can be swung in a range of about 90 degrees, for example, by the rotation of the rotary actuators 26 and 26.
[0012]
The core holding devices 27 and 28 are connected to each other by a connecting device 29 provided in the axial direction of the rotary actuators 26 and 26. The pair of first rotary actuators 24, 24 are controlled to rotate in synchronization with each other, and the pair of second rotary actuators 26, 26 are also controlled to rotate in synchronization with each other. That is, the core holding device 27 and the core holding device 28 are controlled so as to always take the same posture regardless of the rotation of the first and second rotary actuators 24, 24, 26, and 26, and are thus controlled. In addition, they are connected to each other by a connecting device 29.
[0013]
FIG. 6 shows the detailed structure of each core holding device 27, 28. That is, the core holding devices 27 and 28 have a base end cylinder part 32 and a front end cylinder part 33 that constitute a telescopic casing 31, and the base end cylinder part 32 is connected to the second rotary actuator 26. It has become. Compression coil springs 34 are provided between the proximal cylindrical portion 32 and the distal cylindrical portion 33 at a plurality of positions in the circumferential direction. Reference numerals 35 and 36 denote positioning pins, which are respectively attached to the proximal end cylindrical portion 32 and the distal end cylindrical portion 33, and are fitted into one end side and the other end side of the compression coil spring 34, whereby the compression coil spring 34 is inserted. It is configured to be positioned at a predetermined position. By the action of the compression coil spring 34 positioned in this way, the distal end tubular portion 33 in the casing 31 and the proximal end tubular portion 32 connected to the second rotary actuator 26 are pressed in directions away from each other.
[0014]
A journal ball bearing 37 is provided inside the proximal end cylindrical portion 32, and a self-aligning roller bearing 38 is provided inside the distal end cylindrical portion 33. A hollow core support shaft 39 is rotatably supported by the casing 31 by these bearings 37 and 38. Specifically, in the proximal end cylindrical portion 32, the outer peripheral tapered surface 41 of the first ring 40 fixed to the outer periphery of the support shaft 39 is supported by the inner periphery of the bearing 37 and is more distal than the first ring 40. The support shaft 39 is supported by the bearing 37 of the proximal end cylindrical portion 32 in a state in contact with the inner peripheral tapered surface 43 of the second ring 42 provided at a position close to the cylindrical portion 33. That is, the inner peripheral taper surface 43 of the second ring supported on the inner periphery of the bearing 37 is the outer peripheral taper surface of the first ring 40 fixed to the core support shaft 39 by the action of the compression coil spring 34. 41 is pressed and supported in a centered state.
[0015]
A core support member 44 is provided at the tip of a protruding portion 44 that protrudes from the casing 31 toward the centrifugal casting machines 11 and 12 in the core support shaft 39, and a core 45 is attached to the core support member 44.
[0016]
As shown in FIGS. 1 and 2, in the connecting device 29, one core holding device 27 is provided with a thick plate-like first connecting member 47 protruding toward the other core holding device 28. The other core holding device 28 is provided with a box-shaped second connecting member 48 that protrudes in a direction toward the core holding device 27 and has a protruding end opened. 49 is the opening.
[0017]
The front end of the first connecting member 47 enters the second connecting member 48 through the opening 49, and the guide plate 50 is attached to the front end of the entering portion. The guide plate 50 is attached to the first connecting member 47 in a state of being arranged in the vertical direction, whereby the first vertical surface 51 facing the one core holding device 27 and the other core holding. And a second vertical surface 52 facing the device 28.
[0018]
The second connecting member 48 is provided with a plurality of pairs of guide rollers 53 and 53. These guide rollers 53, 53 are in contact with the first vertical surface 51 and the second vertical surface 52 at positions above and below the first connecting member 47, so that guides are provided at these positions. The plate 50 is sandwiched without substantial gaps, and the guide plate 50 is also sandwiched in the same manner at two portions spaced apart in the axial direction of the casting machines 11 and 12 at these positions. That is, as shown in the figure, four pairs of guide rollers 53 are provided.
[0019]
Both the upper surface and the lower surface of the guide plate 50 are configured as a sliding surface 54, and the second connecting member 48 is provided with contact plates 55, 55 in contact with the sliding surface 54.
[0020]
As described above, the plurality of pairs of guide rollers 53 and 53 in the second connecting member 48 of the core holding device 28 sandwich the guide plate 50 in the first connecting member 47 of the core holding device 27 without substantial gaps. And a pair of contact plates 55, 55 in the second connecting member 48 sandwich the guide plate 50 from above and below, so that one core holding device 27 and the other core holding device are arranged. 28, relative to each other along the axial direction of the centrifugal casting machines 11, 12 in a state of being connected without substantial gaps in the vertical direction and the horizontal direction perpendicular to the axial direction of the centrifugal casting machines 11, 12. It is configured to be movable.
[0021]
In this way, the swivel arms 25, 25, the core holding devices 27, 28, and the connecting device 29 form an integral gate-shaped structure, and this structure is swung by the first rotary actuators 24, 24. As a result of this swiveling, the portal structure or core holding device 27, 28 is connected to the outside core receiving position 56 shown in FIG. 4 and the tube receiving port of the centrifugal casting machines 11, 12. It is comprised so that it can rock | fluctuate integrally between the formation parts 14 and 14. FIG.
[0022]
3 and 4, 58 is a chuck device, which is used for chucking a tube cast inside the centrifugal casters 11 and 12 when the tube is pulled out. The chuck device 58 is configured to be able to swing in the vertical direction, so that when the core holding devices 27 and 28 swing toward the core receiving position 56 outside the machine as described above, that is, centrifugal casting. When the tube receptacle forming portions 14 and 14 in the machines 11 and 12 are separated from each other, the tube receptacle forming portions 14 and 14 in the centrifugal casting machines 11 and 12 are used instead of the core holding devices 27 and 28. 14 is configured to be able to be positioned correspondingly.
[0023]
In such a configuration, when casting the pipe, first, the pivoting arms 25 and 25 are pivoted by the first rotary actuators 24 and 24, whereby the core holding devices 27 and 28 are received as shown in FIG. Move integrally toward the position 56. At the core receiving position 56, the cores 45 and 45 are attached to the core support members 44 and 44 of the core holding devices 27 and 28 by a robot device (not shown) or the like. At this time, since each core holding device 27, 28 moves integrally as described above and takes the same posture, for example, the core support of both core holding devices 27, 28 can be easily performed by only one robot device. The cores 45 and 45 can be attached to the members 44 and 44.
[0024]
If the cores 45 and 45 are mounted, the cores 45 and 45 are opposed to the centrifugal casting machines 11 and 12 by turning the turning arms 25 and 25 in the reverse direction by the first rotary actuators 24 and 24. At this time, the core holding devices 27 and 28 are integrally swung by the second rotary actuators 26 and 26 so that the cores of the cores 45 and 45 coincide with the shafts of the centrifugal casting machines 11 and 12. Let them adjust.
[0025]
Next, the cylinder devices 18 and 18 are operated in the contraction direction, and the moving frame 19 is moved in a direction approaching the centrifugal casting machines 11 and 12 while being guided by the guide bars 20 and 20. As a result, the cores 45 and 45 held by the holding devices 27 and 28 are inserted into the tube receptacle forming portions 14 and 14 in the centrifugal casting machines 11 and 12, and the cores are pressed by the pressing force of the cylinder devices 18 and 18. The supporting member 44 is held by the tube receiving portion forming portions 14 and 14. At this time, even if the positions of the tube receptacle forming portions 14 and 14 along the axial center direction of the centrifugal casting apparatuses 11 and 12 are slightly different, the holding devices 27 and 28 are The cylinder castings 18 and 18 can move independently of each other in the axial direction of the centrifugal casting apparatuses 11 and 12, so that each of the centrifugal casting machines 11 and 12 is accurately positioned in the axial direction. It will be mounted on the centrifugal casting machines 11 and 12.
[0026]
In this state, the metal frames of the centrifugal casting apparatuses 11 and 12 are rotated at high speed, and the molten metal is supplied to the inside thereof. At this time, the core support member 44 and the core support shaft of the core 45 and the core holding apparatuses 27 and 28 are supplied. 43 rotates at high speed integrally with the metal frame. At this time, if the cylinder devices 18 and 18 are slightly shortened, the proximal end cylindrical portions 32 of the core holding devices 27 and 28 connected to the cylinder device 18 by the moving frame 19 and the swing arm 25 are Based on the fact that 33 is held by the metal frame via the bearing 38, the core support shaft 39 and the core support member 44, the direction is approached to the distal end cylindrical portion 33 against the force of the spring 34. Then, the inner peripheral tapered surface 43 of the second ring 42 is separated from the outer peripheral tapered surface 41 of the first ring 40, and the core support shaft 39 is supported only by the thrust self-aligning roller bearing 38 in the coupling device 29. become. As a result, even when the metal frames of the centrifugal casting machines 11 and 12 and the core holding devices 27 and 28 do not coincide with each other, the core support shaft 39 and the core 45 are adjusted with respect to the metal frame. It is possible to stably rotate at a high speed in the centered state. For this reason, even when a metal frame has a bend, for example, this can be reliably absorbed.
[0027]
When molten metal is supplied to the centrifugal casting machines 11 and 12, each metal frame is thermally expanded by the heat, but the amount of thermal expansion is slightly different. That is, there is a difference in elongation between the two metal frames. However, at this time, the holding devices 27 and 28 can move in the axial direction of the centrifugal casting devices 11 and 12 based on the force of the cylinder devices 18 and 18 or against the force of the cylinder devices 18 and 18 independently of each other. Therefore, the difference in the elongation of the metal frame can be absorbed, and therefore, the set failure of the cores 45 and 45 and the occurrence of the hot water leaking from the core 45 can be surely prevented.
[0028]
If the pipe is centrifugally cast, the cores 45 and 45 are pulled out from the metal frames of the centrifugal casters 11 and 12 by extending the cylinder devices 18 and 18 to the maximum and moving the frame 19. At this time, most of the cores 45 and 45 are crushed, but after pulling out, the second rotary actuators 26 and 26 are operated to displace the core holding devices 27 and 28 downward as shown in FIG. Then, the sand remaining in the core holding devices 27 and 28 is dropped and discharged.
[0029]
Subsequently, the first rotary actuators 24, 24 are actuated to pivot the arms 25, 25, and the second rotary actuators 26, 26 are also actuated to direct the core holding devices 27, 28 toward the core receiving position 56. And move together so as to have a predetermined posture.
[0030]
Thus, when the core holding devices 27 and 28 are moved, they are moved integrally, so that they can be easily synchronized with each other. Therefore, the actuators 24, 24, 26 and 26 and their control means are simply configured. be able to. The core holding devices 27 and 28 are connected to each other by the connecting device 29 without a substantial gap, and thus the rigidity can be increased. Moreover, the weight can be reduced by increasing the rigidity. Further, as described above, since the above movement is an operation at the extension limit of the cylinder devices 18 and 18, it can be operated in a stable state.
[0031]
When the core holding devices 27 and 28 move or retract toward the core receiving position 56, the chuck device 58 is swung to face the tube receiving portion forming portions 14 and 14 of the centrifugal casting machines 11 and 12, and the chuck A device 58 chucks the tube that is cast inside the metal frame. When the casting carriage 13 is moved away from the chuck device 58 in this state, the cast tube can be pulled out from the centrifugal casting machines 11 and 12. After drawing, the tube is taken out of the machine and the chuck device 58 is returned to its original position to prepare for the next casting cycle. When the core holding devices 27 and 28 are retracted to the core receiving position 56, the metal frames of the centrifugal casting machines 11 and 12 can be easily replaced in that state.
[0032]
【The invention's effect】
As described above, according to the present invention, in a centrifugal casting apparatus in which two centrifugal casting machines for centrifugally casting a tube are provided side by side, a core is attached to a tube receiving port forming portion in each centrifugal casting machine. The first and second core holding devices are provided corresponding to the centrifugal casting machines, respectively, and the first and second core holding devices are connected to each other so that the core receiving position outside the machine is The first and second core holding devices are formed so as to be integrally movable between the positions of the tube receiving portion forming portions in the centrifugal casting machines, and the first and second core holding devices are formed in the centrifugal receiving portions. When the core is attached to the part, it is configured to be relatively movable along the axial direction of the centrifugal casting machine. Connecting them together improves their rigidity. It is possible to reduce the weight of the two core holding devices, and the two core holding devices can be moved integrally. Therefore, both the control means and the driving means can be easily adjusted. Can be configured. In addition, since both core holding devices are configured to be movable relative to each other along the axial direction of the centrifugal casting machine when the core is mounted on the tube receiving portion of each centrifugal casting machine, each casting By absorbing the difference in thermal expansion of the metal frame in the machine, the core can be securely attached to each casting machine.
[Brief description of the drawings]
FIG. 1 is a plan view of a main part of a core setter in a centrifugal casting apparatus according to an embodiment of the present invention.
FIG. 2 is a side view of the part shown in FIG.
FIG. 3 is an overall plan view of a core setter in the centrifugal casting apparatus.
4 is a front view of the portion shown in FIG. 3;
FIG. 5 is a side view of the part shown in FIG. 4;
FIG. 6 is a detailed sectional view of a core holding device used for a core setter in the centrifugal casting apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Centrifugal casting machine 12 Centrifugal casting machine 14 Tube receiving part formation 27 Core holding device 28 Core holding device 29 Connecting device 45 Core 56 Core receiving position

Claims (1)

1st and 2nd core holding | maintenance for attaching a core to the formation part of the pipe socket in each centrifugal casting machine in the centrifugal casting apparatus provided with two centrifugal casting machines for centrifugally casting a pipe An apparatus is provided corresponding to each of these centrifugal casting machines, and the first and second core holding devices are connected to each other, so that the core receiving position outside the machine and the tube receiving port in each centrifugal casting machine The first and second core holding devices are configured so that they can be moved integrally with each other when the core is mounted on the tube receiving port forming portion of each centrifugal casting machine. A core setter in a centrifugal casting apparatus, wherein the core setter is configured to be movable relative to each other along the axial direction of the centrifugal casting machine.

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