Processing tool and processing method

Abstract

To provide a processing tool which is simply constituted and which can bring a polishing surface into contact with an object surface by a uniform force, and a processing method.SOLUTION: A processing tool comprises a polishing part 210 and a traction part 220. The polishing part 210 has an outer peripheral surface 211a in which a second axis L2 is set as a center axis and which adapts to a shape of a valve seat 112a. The outer peripheral surface 211a includes a polishing surface for polishing the valve seat 112a. The traction part 220 is constituted to pull a central position of the polishing part 210 in a prescribed direction in a state in which the outer peripheral surface 211a of the polishing part 210 faces the valve seat 112a.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to processing tools and processing methods. [Background technology]

[0002] For example, in a valve that cuts off a fluid, the adhesion between the valve body and the valve seat is important. Therefore, in order to improve the adhesion, lapping (grinding) is sometimes performed on the valve seat using a processing tool (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-242518 Summary of the Invention [Problem to be solved by the invention]

[0004] Although different from the method described in Patent Document 1, in conventional methods, a jig that supports centering was installed in order to align the center of the polishing tool. For this reason, a process was required to remove the jig once and then reinstall it every time maintenance work was performed on the polishing surface of the polishing tool (e.g., replacing sandpaper), which took time for the maintenance work. In addition, in this conventional method, the polishing tool is pressed against the valve seat by human force, which makes the polishing tool prone to misalignment or tipping. If the polishing tool becomes misaligned or tipping, it becomes difficult to press the polishing surface of the polishing tool against the valve seat with uniform force, and the polishing surface becomes uneven, which can cause problems with the lapping finish.

[0005] In addition, the method described in Patent Document 1 uses large-scale equipment, and therefore the installation of the equipment may require complicated steps.

[0006] The present disclosure has been made in consideration of the above circumstances, and aims to provide a processing tool and processing method having a simple configuration that can bring an abrasive surface into contact with a target surface with a uniform force. [Means for solving the problem]

[0007] In order to solve the above problems, the processing tool and processing method of the present disclosure employ the following means. A processing tool according to one embodiment of the present disclosure is a processing tool for processing an inner surface having an inner diameter that decreases in a predetermined direction along a first axis, the processing tool comprising a grinding unit and a pulling unit, the grinding unit having an outer peripheral surface that has a second axis as a central axis and that conforms to a shape of the inner peripheral surface, the outer peripheral surface including a grinding surface that grinds the inner peripheral surface, and the pulling unit configured to pull a center position of the grinding unit in the predetermined direction with the outer peripheral surface of the grinding unit facing the inner peripheral surface.

[0008] Moreover, a processing method according to one aspect of the present disclosure is a processing method using the above-mentioned processing tool, and includes a traction step and a rotation step, in which the traction part traction the polishing part in the predetermined direction, and in which the rotation step rotates the polishing part around the second axis. Effect of the Invention

[0009] According to the present disclosure, it is possible to provide a processing tool and a processing method having a simple configuration that can bring an abrasive surface into contact with a target surface with a uniform force. [Brief description of the drawings]

[0010] [Figure 1] 1 is a partially cutaway perspective cross-sectional view of a steam valve to be processed by a processing tool according to an embodiment of the present disclosure. FIG. [Diagram 2] 1 is a longitudinal sectional view of a steam valve to be processed by a processing tool according to an embodiment of the present disclosure. FIG. [Diagram 3] FIG. 1 is a longitudinal cross-sectional view of a steam valve with a processing tool installed according to one embodiment of the present disclosure (without wires). [Figure 4]FIG. 1 is a longitudinal cross-sectional view of a steam valve with a processing tool installed according to one embodiment of the present disclosure (with wires). [Diagram 5] FIG. 2 is a side view of a processing tool according to one embodiment of the present disclosure. [Figure 6] FIG. 13 is a front view of a traction portion of a processing tool according to one embodiment of the present disclosure. [Figure 7] FIG. 13 is a front view of a traction portion of a processing tool according to one embodiment of the present disclosure. [Figure 8] FIG. 13 is a front view of a traction portion of a processing tool according to one embodiment of the present disclosure. [Figure 9] FIG. 13 is a front view of a traction portion of a processing tool according to one embodiment of the present disclosure. [Figure 10] FIG. 13 is a front view of a traction portion of a processing tool according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] <Steam valves> The steam valve 100 is a valve that is installed, for example, at the steam intake of a steam turbine and serves to allow or stop the passage of steam. As shown in FIGS. 1 and 2, the steam valve 100 includes a first casing 110, a second casing 120, and a valve portion .

[0012] The first casing 110 is a member that defines a first valve chamber 111 and a communication flow passage 112 therein.

[0013] The first valve chamber 111 is a space into which steam supplied from the outside is introduced via a steam inlet 113 formed in the first casing 110 . The first valve chest 111 is a space that is also used as a working space for wrapping, which will be described later.

[0014] The communication passage 112 is a passage for guiding the steam that has flowed into the first valve chest 111 to a second valve chest 121, which will be described later. The communicating passage 112 extends along the first axis L1, and has a circular cross section in a plane substantially perpendicular to the first axis L1 (a cross section relative to the first axis L1). That is, the communicating passage 112 has a cylindrical inner circumferential surface with the first axis L1 as the central axis. An inlet portion of this inner circumferential surface (an inlet portion of the communicating passage 112) is made to be a valve seat 112a. Here, the inlet portion of the communicating passage 112 can be referred to as a portion of the communicating passage 112 adjacent to the first valve chamber 111, a boundary portion of the communicating passage 112 with the first valve chamber 111, or a connection portion of the communicating passage 112 with the first valve chamber 111.

[0015] The valve seat 112a is a surface that receives a valve body 131 of the valve portion 130, which will be described later. The valve seat 112a has an inner diameter that decreases in a predetermined direction along the first axis L1. That is, the valve seat 112a narrows in a predetermined direction along the first axis L1. Here, the predetermined direction coincides with a direction from the first valve chamber 111 to the communication passage 112 on the first axis L1 (main steam flow direction). In the case of FIG. 2, the first axis L1 is along the left-right direction, and the predetermined direction is a direction from right to left along the first axis L1. The left-right direction in FIG. 2 coincides with, for example, the actual horizontal direction, but this is merely an example and does not limit the attitude of the steam valve 100. The shape of the valve seat 112a may be any shape as long as the inner diameter is reduced, and may be, for example, tapered, may have rounded corners so as to be convex, may have rounded corners so as to be concave, or may be a combination of these.

[0016] An opening 114 is formed in the upper portion of the first casing 110. The surface of the first casing 110 around the opening 114 is a flange surface 115. A lid 140 is attached to the flange surface 115. The lid 140 is fastened to the first casing 110 by, for example, bolts. In order to attach the lid 140, the flange surface 115 is machined to have a flat surface.

[0017] The second casing 120 is a member that defines a second valve chamber 121 therein. The second casing 120 is provided downstream of the first casing 110 in the mainstream direction of steam, and is connected to the first casing 110. In detail, the second casing 120 is connected to a portion of the first casing 110 that defines the outlet portion of the communication flow passage 112.

[0018] The second valve chest 121 is a space to which the steam that has flowed into the first valve chest 111 is guided via the communication passage 112 . The second valve chest 121 is a space that is also used as a working space for wrapping, which will be described later.

[0019] An opening 124 is formed in the upper portion of the second casing 120 . The surface of the second casing 120 around the opening 124 is a flange surface 125. A lid 150 is attached to the flange surface 125. The lid 150 is fastened to the second casing 120 by, for example, bolts. In order to attach the lid 150, the flange surface 125 is machined to have a flat surface.

[0020] The valve portion 130 is a mechanism for allowing steam to flow from the first valve chamber 111 to the communicating passage 112 or blocking the flow of steam by opening or closing the inlet (opening) of the communicating passage 112. The valve portion 130 includes a valve body 131 and an arm 132 .

[0021] The valve element 131 is a component that actually opens and closes the inlet of the communication flow passage 112 . The valve body 131 has a disc shape that is curved so as to be convex toward the first valve chamber 111. The valve body 131 has an outer peripheral surface 131a that approximately matches the shape of the valve seat 112a (the inner peripheral surface of the inlet portion of the communicating flow path 112), and is configured to be in close contact with the valve seat 112a. More precisely, the valve seat 112a is lapped by a processing tool 200 described below so that the shape of the valve seat 112a approximately matches the shape of the outer peripheral surface 131a of the valve body 131. Here, approximately matching means "a shape precision to the extent that the surface (outer peripheral surface 131a) and the surface (valve seat 112a) can be brought into complete contact" or "a shape precision to the extent that the flow of steam is appropriately blocked by contact between the surface (outer peripheral surface 131a) and the surface (valve seat 112a) / function as a stop valve is performed." It should be noted that the valve body 131 only needs to have an outer circumferential surface 131a that matches the shape of the valve seat 112a, and the shape of the portions other than the outer circumferential surface 131a is not particularly limited.

[0022] The arm 132 is a component that is driven by a drive source (actuator) not shown, and that supports the valve body 131 and moves the valve body 131 between an open position and a closed position. Here, the open position is the position indicated by the dotted line in Fig. 2, where the outer circumferential surface 131a of the valve disc 131 is not in close contact with the valve seat 112a. On the other hand, the closed position is the position indicated by the solid line in Fig. 2, where the outer circumferential surface 131a of the valve disc 131 is in close contact with the valve seat 112a. When the valve disc 131 is in the open position, steam flows from the first valve chamber 111 toward the communicating passage 112. On the other hand, when the valve disc 131 is in the closed position, steam flowing from the first valve chamber 111 toward the communicating passage 112 is blocked.

[0023] <About processing tools> As shown in FIGS. 3 and 4, the processing tool 200 is a tool for lapping the valve seat 112a formed in the first casing 110. As shown in FIGS. 3 to 5, the processing tool 200 includes an abrasive portion 210 and a traction portion 220.

[0024] <<About the polishing department>> The polishing section 210 is a section that actually polishes the valve seat 112a. The grinding unit 210 has a grinding unit body 211 and an omnidirectional eyebolt 212 (connector).

[0025] The grinding portion main body 211 is a disc-shaped component with the second axis L2 as its central axis. The polishing body 211 has an outer circumferential surface 211a. The outer diameter of the outer peripheral surface 211a decreases in a predetermined direction along the second axis L2, and its shape matches the shape of the valve seat 112a. Here, matching includes "a state in which the shape of the outer peripheral surface 211a approximately matches the shape of the valve seat 112a" and "a state in which the shapes can be made approximately the same by wrapping (for example, a state in which the shapes match macroscopically, but surface roughness or waviness remains microscopically)." The outer peripheral surface 211a includes a polishing surface that actually comes into contact with the valve seat 112a and polishes the valve seat 112a. The polishing surface may be formed over the entire circumference of the outer peripheral surface 211a, or may be formed on a part of the outer peripheral surface 211a. Examples of the polishing surface include sandpaper or diamond paper attached to the outer peripheral surface 211a. The shape of the outer circumferential surface 211a of the grinding part body 211 approximately matches the shape of the outer circumferential surface 131a of the valve body 131, and by grinding the valve seat 112a with the outer circumferential surface 211a of the grinding part body 211, the shape of the valve seat 112a approximately matches the shape of the outer circumferential surface 131a of the valve body 131. In other words, the shape that serves as the master in processing is the shape of the outer circumferential surface 211a of the grinding part body 211.

[0026] An omnidirectional eyebolt 212 is attached to the center of the polishing unit body 211 . The omnidirectional eyebolt 212 is attached so as to face the second casing 120 when the valve seat 112a is machined. The omnidirectional eyebolt 212 has a bolt portion 212a and a ring portion 212b. The bolt portion 212a is fixed (fastened) to the grinder body 211 and does not move relative to the grinder body 211. Although the ring portion 212b is connected to the bolt portion 212a, it is rotatable about the second axis L2 relative to the bolt portion 212a. In other words, the ring portion 212b is also rotatable about the second axis L2 relative to the grinding portion main body 211.

[0027] <<About the towing part>> As shown in Figures 4 and 5, the traction portion 220 is a part that imparts a force to the grinding portion 210 to bring the outer surface 211a of the grinding portion main body 211 into contact with the valve seat 112a of the first casing 110 by pulling the grinding portion 210 in a predetermined direction. The traction unit 220 includes a wire 221 (a cord-like member), a traction mechanism 230, and a pulley 222 (a hanging device).

[0028] The wire 221 is a deformable, elongated part for transmitting the force generated by the traction mechanism 230 to the polishing unit 210 (the force that tractionally pulls the polishing unit 210 in a predetermined direction; hereinafter, also simply referred to as the “traction force”). The wire 221 connects the grinder 210 and the traction mechanism 230. In detail, the wire 221 has a first end 221a and a second end 221b, the first end 221a being fastened to a ring 233a of the traction mechanism 230 (see FIG. 8), and the second end 221b being fastened to a ring portion 212b of the omnidirectional eyebolt 212 (see FIG. 5). The wire 221 is merely an example, and any deformable, elongated part such as a rope or chain can be used as the cord-like body. In any case, the material of the cord-like body is not particularly limited as long as it can withstand the tension generated by the pulling force.

[0029] The traction mechanism 230 is a mechanism that generates a traction force and applies the traction force to the wire 221 . The traction mechanism 230 is installed in the second casing 120 of the steam valve 100 . As shown in Figures 5 and 6, the traction mechanism 230 has a frame 231, a base plate 232, a movable plate 233, a pushing portion 234, at least one (e.g., two) gas springs 235 (first loading means), and at least one (e.g., two) spring load applying portions 236 (second loading means).

[0030] The frame 231 is a structure having a substantially rectangular portion, and includes two frame shafts 231a (231a1, 231a2), a fixing plate 231b, and a fixing plate 231c. The frame shaft 231a is a rod-shaped part extending in the up-down direction in Fig. 5 and Fig. 6. The shape of the frame shaft 231a is not limited to a round rod shape, and may be, for example, a square rod shape. The direction in which the frame shaft 231a extends is an example for explanation, and does not limit the actual posture of the processing tool 200. The fixed plate 231b is a plate-shaped component extending in a direction (left-right direction in FIG. 6) substantially perpendicular to the direction in which the frame shaft 231a extends. The fixed plate 231b connects the upper part of the frame shaft 231a1 and the upper part of the frame shaft 231a2. The fixed plate 231c is a plate-like component that is parallel to the fixed plate 231b. The fixed plate 231c connects the lower portion of the frame shaft 231a1 and the lower portion of the frame shaft 231a2.

[0031] The base plate 232 is a plate-shaped component extending in a direction (left-right direction in FIG. 6) substantially perpendicular to the direction in which the frame shaft 231a extends. The base plate 232 is also a component for installing the traction mechanism 230 in the second casing 120. The base plate 232 is located between the fixed plate 231b and the fixed plate 231c, the frame shaft 231a is inserted through the base plate 232, and the base plate 232 is fixed to the frame shaft 231a. Therefore, the base plate 232 does not move relative to the frame shaft 231a (frame 231). The base plate 232 is installed and fixed to the flange surface 125 of the second casing 120. This results in the traction mechanism 230 being installed in the second casing 120. At this time, since the flange surface 125 is flat, the base plate 232 can be stably installed. In addition, the base plate 232 can be fixed with a bolt (not shown) using the bolt hole 125a provided in the flange surface 125. Note that the flange surface 125 and the bolt hole 125a are structures that are originally used when attaching the lid 150 to the second casing 120.

[0032] The movable plate 233 is a plate-shaped component that is parallel to the base plate 232 . The movable plate 233 is located between the fixed plate 231b and the base plate 232, and the frame shaft 231a is inserted through the movable plate 233 but is not fixed to the frame shaft 231a. Therefore, the movable plate 233 is slidable relative to the frame shaft 231a (frame 231) along the direction in which the frame shaft 231a extends. A ring 233a is provided on the lower surface of the movable plate 233 to which the second end 221b of the wire 221 is fastened.

[0033] The pushing portion 234 is a mechanism capable of pushing the movable plate 233 toward the base plate 232 . The pushing portion 234 is provided above the movable plate 233 . The pushing portion 234 has a pushing shaft 234a and a handle 234b provided at the upper end of the pushing shaft 234a. The pushing shaft 234a is a round bar-shaped part with a screw thread formed on its outer circumferential surface, and is fitted into a screw hole formed in the fixed plate 231b of the frame 231. By gripping the handle 234b and turning the pushing shaft 234a, the pushing shaft 234a can be moved relative to the fixed plate 231b. The moving direction of the pushing shaft 234a is the same as the extending direction of the frame shaft 231a. At this time, since the lower end of the pushing shaft 234a is in contact with the movable plate 233, the moving of the pushing shaft 234a toward the base plate 232 can push the movable plate 233 toward the base plate 232.

[0034] The gas spring 235 is a component that applies a force to the movable plate 233 in a direction in which the movable plate 233 moves away from the base plate 232 . The gas spring 235 has a tube 235a and a rod 235b that extends from the tube 235a and moves forward and backward relative to the tube 235a. The gas spring 235 is provided between the base plate 232 and the movable plate 233 , with the tube 235 a fixed to the base plate 232 and the rod 235 b fixed to the movable plate 233 . When the rod 235b is pushed into the tube 235a, the gas spring 235 generates a reaction force in a direction in which the rod 235b protrudes from the tube 235a (in a direction in which the rod 235b returns to its original position). The generated reaction force is constant regardless of the amount by which the rod 235b is pushed in. In the traction mechanism 230 of this embodiment, the reaction force of the gas spring 235 is utilized to apply a force to the movable plate 233 in a direction in which the movable plate 233 moves away from the base plate 232. It should be noted that gas spring 235 is just one example, and any part that generates a constant force when the distance between base plate 232 and movable plate 233 is within a predetermined range can be used as the first loading means.

[0035] The spring load applying portion 236 is a portion that applies a force to the movable plate 233 in a direction that pushes the movable plate 233 , to which a force from the gas spring 235 is applied, toward the base plate 232 . The spring loaded portion 236 includes a threaded shaft 236a, a nut 236b, and a coil spring 236c. The threaded shaft 236a is a rod-shaped part having a screw thread formed on its outer circumferential surface and extending in the same direction as the frame shaft 231a, with its lower end fixed to the base plate 232 and its upper end protruding from the movable plate 233. At this time, the threaded shaft 236a is inserted through the movable plate 233 but is not fixed to the threaded shaft 236a. Therefore, the movable plate 233 is slidable relative to the threaded shaft 236a along the direction in which the threaded shaft 236a extends. The nut 236 b is fitted onto the portion of the threaded shaft 236 a that protrudes from the movable plate 233 . The coil spring 236c is provided to wind around the portion of the threaded shaft 236a between the movable plate 233 and the nut 236b.

[0036] In the spring load applying portion 236 configured as above, when the nut 236b is rotated in a predetermined direction, the nut 236b approaches the movable plate 233. When the nut 236b approaches the movable plate 233, the coil spring 236c is eventually compressed. As a result, a restoring force is generated by the coil spring 236c. The magnitude of this restoring force can be adjusted by the amount of compression of the coil spring 236c. In the traction mechanism 230 of the present embodiment, a force in a direction pushing the movable plate 233 towards the base plate 232 is applied to the movable plate 233 by utilizing the restoring force of the coil spring 236c. It should be noted that the spring load applying portion 236 is just one example, and any part capable of applying an adjustable force to the movable plate 233 can be used as the second loading means.

[0037] The pulley 222 is a component around which the wire 221 is hung. As shown in FIG. As shown in FIG. 6, the pulley 222 is located between the fixed plate 231c and the base plate 232, and is supported by the frame shaft 231a. The pulley 222 is movable relative to the frame 231. Examples of the direction in which the pulley 222 is movable include the direction in which the frame shaft 231a extends and / or a direction approximately perpendicular to that direction (for example, the direction in which the fixed plate 231c extends). The pulley 222 may be supported by a portion other than the frame shaft 231a. The number of the pulleys 222 may be more than one.

[0038] <About the use of processing tools> The processing tool 200 is used, for example, as follows. As shown in FIGS. 3 and 6, the base plate 232 of the traction mechanism 230 is fixed to the flange surface 125 of the second casing 120 with bolts (not shown). Then, as shown in FIG. 7, handle 234b of pusher 234 is turned to move movable plate 233 in a direction in which movable plate 233 approaches base plate 232, and a reaction force (a constant force) is generated by gas spring 235. Furthermore, the position of the nut 236b of the spring load applying portion 236 is adjusted so that no restoring force is generated by the coil spring 236c.

[0039] In addition, the grinding part 210 is supported so that the outer circumferential surface 211 a of the grinding part main body 211 is in contact with the valve seat 112 a of the first casing 110 . At this time, the outer circumferential surface 211a does not need to be in close contact with the valve seat 112a, and the outer circumferential surface 211a does not need to be pressed against the valve seat 112a.

[0040] 4, 5, and 8, the traction mechanism 230 and the polishing unit 210 are connected by the wire 221. In detail, the first end 221a of the wire 221 is fastened to the ring 233a of the movable plate 233, the middle portion of the wire 221 (the portion between the first end 221a and the second end 221b) is hung on the pulley 222 to bend the wire 221 by approximately 90 degrees, and the second end 221b of the wire 221 is fastened to the ring portion 212b of the omnidirectional eyebolt 212. At this time, no tension caused by the traction mechanism 230 is generated in the wire 221 .

[0041] It is preferable that the portion of the wire 221 from the pulley 222 to the omnidirectional eyebolt 212 be parallel to the first axis L1. This is to allow a traction force to be efficiently applied to the grinding unit body 211 in the traction process described below. Therefore, the pulley 222 may be moved relative to the frame 231 so that the position of the pulley 222 approximately coincides with the position of the omnidirectional eyebolt 212 in the direction perpendicular to the first axis L1.

[0042] Next, as shown in FIG. 9, the handle 234b of the pushing portion 234 is rotated in the opposite direction to the previous rotation to move the movable plate 233 in the direction away from the base plate 232. At this time, the wire 221 is set to a length that generates tension while the movable plate 233 is being returned. In other words, the wire 221 is set to a length that generates tension before the movable plate 233 is completely returned to its original position (a position where no reaction force is generated by the gas spring 235). Furthermore, the position of the nut 236b of the spring load applying portion 236 is adjusted so that no restoring force is generated by the coil spring 236c. In this state, only the reaction force of the gas spring 235 is transmitted to the grinding unit 210 via the wire 221. The grinding unit body 211 of the grinding unit 210 is pulled in a predetermined direction by the force transmitted via the wire 221. As a result, the outer circumferential surface 211a of the grinding unit body 211 is pressed against the valve seat 112a.

[0043] Next, as shown in FIG. 10, the nut 236b is turned to compress the coil spring 236c, causing the coil spring 236c to generate a restoring force. When the movable plate 233 is used as a reference, the restoring force of the coil spring 236c acts against the reaction force of the gas spring 235. Therefore, when the restoring force of the coil spring 236c is generated, the movable plate 233 is pushed slightly toward the base plate 232. Then, the wire 221 is loosened by the amount of movement of the movable plate 233, and the tension generated in the wire 221 is reduced. In other words, the traction force transmitted by the wire 221 is reduced. By utilizing this, the amount of compression of the coil spring 236c can be adjusted to adjust the traction force transmitted to the grinding body 211 via the wire 221. This allows the outer circumferential surface 211a of the grinding body 211 to be pressed against the valve seat 112a with an appropriate force.

[0044] As described above, the process of generating a strong tension in the wire 221 by the reaction force of the gas spring 235 and then reducing the tension by the restoring force of the coil spring 236c to pull the grinding unit body 211 with an appropriate pulling force is called the "pulling process." This pulling process is performed by, for example, an operator. If the traction force is too weak, the grinding unit body 211 may tilt. If the traction force is too weak, grinding does not proceed (grinding is difficult) in the rotation process described below. If the traction force is too strong, it becomes difficult to rotate the grinding unit body 211 around the second axis L2 in the rotation process described below.

[0045] After the pulling step, the grinding unit body 211 is rotated around the second axis L2 from the side of the first valve chamber 111. This step is called the “rotating step.” The rotating step is performed, for example, by an operator. As a result, the polishing unit body 211 rotates with the outer circumferential surface 211a pressed against the valve seat 112a, so that the valve seat 112a is polished by the polishing surface included in the outer circumferential surface 211a. At this time, since the wire 221 and the grinding unit body 211 are connected by the omnidirectional eyebolt 212, the wire 221 will not be twisted even if the grinding unit body 211 rotates.

[0046] The above-mentioned rotating process is characterized in that the polishing portion body 211 is automatically centered with respect to the valve seat 112a. The alignment will be described in detail below.

[0047] The valve seat 112a has an inner diameter that decreases in a predetermined direction along the first axis L1. The outer diameter of the outer peripheral surface 211a of the grinding unit body 211 decreases in a predetermined direction along the second axis L2, and the shape of the outer peripheral surface 211a is adapted to the shape of the valve seat 112a. When the grinder body 211 having such a shape is pulled in a predetermined direction, the outer peripheral surface 211a of the grinder body 211 faces and contacts the valve seat 112a. At this time, since a traction force is applied to the center position of the grinder body 211, the traction force is uniformly distributed on the outer peripheral surface 211a of the grinder body 211.

[0048] In this state, by rotating the grinder body 211 about the second axis L2, the grinder body 211 moves in the radial direction relative to the valve seat 112a so that the outer circumferential surface 211a of the grinder body 211 fits onto the valve seat 112a. As a result, the second axis L2, which is the central axis of the polishing portion main body 211, coincides with the first axis L1, which is the central axis of the valve seat 112a, and the centers are automatically aligned.

[0049] By rotating the polishing body 211 while pulling the center position of the polishing body 211 in the centered state, lapping is performed with the outer peripheral surface 211a of the polishing body 211 in contact with the valve seat 112a with uniform force. As a result, the valve seat 112a is polished evenly by the outer circumferential surface 211a of the polishing portion main body 211.

[0050] According to this embodiment, the following effects are obtained.

[0051] The inner diameter of the valve seat 112a decreases in a predetermined direction, and the outer peripheral surface 211a of the polishing unit body 211 conforms to the shape of the valve seat 112a. In addition, the central position of the polishing unit body 211 is pulled in a predetermined direction by the towing unit 220 with the outer peripheral surface 211a of the polishing unit body 211 facing the valve seat 112a. Therefore, when the pulled polishing unit body 211 is rotated around the second axis L2, the polishing unit body 211 moves relative to the valve seat 112a and is automatically centered so that the outer peripheral surface 211a of the polishing unit body 211 fits into the valve seat 112a. Therefore, when the grinder body 211 is pulled, the outer peripheral surface 211a (specifically, the grinding surface) comes into contact with the valve seat 112a with a uniform force. If the grinder body 211 is rotated around the second axis L2 in this state, the valve seat 112a is ground uniformly by the outer peripheral surface 211a of the grinder body 211.

[0052] In addition, the simple configuration of the shape of the valve seat 112a, the outer peripheral surface 211a of the polishing part body 211 that fits that shape, and the polishing part body 211 whose central position is pulled allows the polishing part body 211 to be automatically centered with respect to the valve seat 112a.

[0053] In addition, since the omnidirectional eyebolt 212 connects the grinding unit body 211 to the wire 221 so as to be rotatable about the second axis L2, only the grinding unit body 211 can be rotated about the second axis L2 without causing any twisting in the wire 221.

[0054] In addition, the tension generated in the wire 221 can be adjusted by the combination of the gas spring 235 and the spring load applying portion 236 .

[0055] Furthermore, since the wire 221 is bent by the pulley 222, the degree of freedom in arranging the position of the first end 221a of the wire 221 connected to the traction mechanism 230 increases.

[0056] In addition, since the pulley 222 is movable, the position of the first end 221a and / or the second end 221b of the wire 221 can be adjusted.

[0057] <Modification> So far, we have used the lapping process of the valve seat 112a of the steam valve 100 as an example, but the processing tool 200 and processing method disclosed herein can also be applied to other structures having an inner surface whose inner diameter decreases in a specified direction. An example of another structure is a welding groove provided at the end of a pipe or the like when the pipe is butt-welded. In this case, the processing tool 200 can process or correct the groove surface.

[0058] The processing tool and processing method according to one embodiment of the present disclosure described above can be understood, for example, as follows.

[0059] A processing tool (200) according to a first aspect of the present disclosure is a processing tool (200) for processing an inner circumferential surface (112a) having a first axis (L1) as a central axis and an inner diameter that decreases in a predetermined direction along the first axis (L1), and includes a grinding unit (210) and a pulling unit (220), wherein the grinding unit (210) has an outer circumferential surface (211a) having a second axis (L2) as a central axis and conforming to a shape of the inner circumferential surface (112a), the outer circumferential surface (211a) includes a grinding surface that grinds the inner circumferential surface (112a), and the pulling unit (220) is configured to pull a center position of the grinding unit (210) in the predetermined direction with the outer circumferential surface (211a) of the grinding unit (210) facing the inner circumferential surface (112a).

[0060] According to the processing tool (200) of this embodiment, the inner diameter of the inner circumferential surface (112a) decreases in a predetermined direction, the outer circumferential surface (211a) of the grinding portion (210) fits the shape of the inner circumferential surface (112a), and the central position of the grinding portion (210) is pulled in a predetermined direction by the pulling portion (220) with the outer circumferential surface (211a) of the grinding portion (210) facing the inner circumferential surface (112a). Therefore, when the pulled grinding portion (210) is rotated around the second axis (L2), the grinding portion (210) moves relative to the inner circumferential surface (112a) so that the outer circumferential surface (211a) of the grinding portion (210) fits into the inner circumferential surface (112a), and is automatically centered. Therefore, when the grinding part (210) is pulled, the outer peripheral surface (211a) (specifically, the grinding surface) of the grinding part (210) comes into contact with the inner peripheral surface (112a) with a uniform force. When the grinding part (210) is rotated around the second axis line (L2) in this state, the inner peripheral surface (112a) is uniformly ground by the outer peripheral surface (211a) of the grinding part (210). In addition, the simple configuration of the shape of the inner circumferential surface (112a), the outer circumferential surface (211a) of the grinding portion (210) that fits the shape, and the grinding portion (210) that is pulled to its central position enables the grinding portion (210) to be automatically centered with respect to the inner circumferential surface (112a).

[0061] In the processing tool (200) according to the second aspect of the present disclosure, in the first aspect, the polishing section (210) has a polishing section main body (211) including the outer circumferential surface (211a), and a connecting device (212) provided on the polishing section main body (211) and to which the towing section (220) is connected, and the connecting device (212) connects the polishing section main body (211) to the towing section (220) so as to be freely rotatable around the second axis (L2).

[0062] According to the processing tool (200) of this embodiment, the connecting device (212) connects the grinding body (211) to the traction part (220) so as to be freely rotatable around the second axis (L2), so that only the grinding body (211) can be rotated around the second axis (L2) without moving the traction part (220).

[0063] In the second aspect of the processing tool (200) according to the third aspect of the present disclosure, the traction section (220) has a cord-like body (221) connected to the connecting device (212) and transmitting a traction force to the polishing section main body (211), and a traction mechanism (230) that imparts a force to the cord-like body (221) to pull the polishing section main body (211).

[0064] The processing tool (200) of this embodiment has a cord-like body (221) that transmits a pulling force to the polishing body (211), and a pulling mechanism (230) that imparts a pulling force to the polishing body (211) to the cord-like body (221). Therefore, even if the pulling mechanism (230) is installed in a location away from the polishing body (211) (for example, a location where the pulling mechanism (230) can be easily installed stably), the pulling force can be transmitted to the polishing body (211) via the cord-like body (221). The cord-like body (221) may be, for example, a rope or a chain.

[0065] In the processing tool (200) according to the fourth aspect of the present disclosure, in the third aspect, the traction mechanism (230) has a first loading means (235) that applies a force to the cord-like body (221) to pull the polishing portion main body (211) in the predetermined direction, and a second loading means (236) that applies a force to the cord-like body (221) to release the tension generated in the cord-like body (221) by the first loading means (235).

[0066] According to the processing tool (200) of this embodiment, the traction mechanism (230) has a first loading means (235) that applies a force to the cord-like body (221) to pull the polishing section main body (211) in a predetermined direction, and a second loading means (236) that applies a force to the cord-like body (221) to relax the tension generated in the cord-like body (221) by the first loading means (235). Therefore, the tension generated in the cord-like body (221) can be adjusted by combining the first loading means (235) and the second loading means (236).

[0067] In the processing tool (200) according to the fifth aspect of the present disclosure, in the third or fourth aspect, the cord-like body (221) has a first end (221a) and a second end (221b), the first end (221a) of the cord-like body (221) is connected to the traction mechanism (230), the second end (221b) of the cord-like body (221) is connected to the connector (212) of the polishing section (210), the traction section (220) has at least one hanger (222) hung on a portion of the cord-like body (221) between the first end (221a) and the second end (221b), and the cord-like body (221) is bent by the hanger (222).

[0068] According to the processing tool (200) of this embodiment, the cord-like body (221) is bent by the hanging device (222), so that the degree of freedom in arranging the position of the first end (221a) of the cord-like body (221) connected to the traction mechanism (230) is increased.

[0069] A sixth aspect of the present disclosure relates to a processing tool (200) of the fifth aspect, in which the hanger (222) is movable.

[0070] According to the processing tool (200) of this embodiment, the hanging tool (222) is movable, so that the position of the first end (221a) and / or the second end (221b) of the cord-like body (221) can be adjusted.

[0071] A processing method according to a seventh aspect of the present disclosure is a processing method using the processing tool (200) described in the first aspect, and includes a pulling step and a rotating step, in which the pulling part (220) pulls the grinding part (210) in the predetermined direction, and in which the rotating step rotates the grinding part (210) around the second axis (L2).

[0072] In the processing method according to an eighth aspect of the present disclosure, in the seventh aspect, in the rotating step, the polishing part (210) is rotated from the side opposite to the side being pulled by the pulling part (220). [Explanation of symbols]

[0073] 100 Steam valve 110 First casing 111 1st valve chamber 112 Connecting flow path 112a Valve seat (inner surface) 113 Steam inlet 114 Aperture 115 Flange surface 120 Second casing 121 2nd valve chamber 124 Aperture 125 Flange surface 125a bolt hole 130 Valve section 131 Valve body 131a Outer surface 132 Arm 140 Lid (for first casing) 150 Lid (for second casing) 200 Processing tools 210 Polishing section 211 Grinding unit body 211a Outer surface 212 Omnidirectional eye bolt (connector) 212a Bolt section 212b Ring section 220 Traction section 221 Wire 221a 1st end 221b 2nd end 222 Pulley (hanging device) 230 Traction mechanism 231 Frames 231a(231a1) Frame shaft 231a(231a2) Frame shaft 231b Fixing plate 231c Fixing plate 232 Base Plate 233 Movable Plate 233a Ring 234 Push-in section 234a Push-in shaft 234b Handle 235 Gas spring (first load means) 235a tube 235b Rod 236 Spring load loading section (second loading means) 236a Threaded Shaft 236b Nut 236c Coil spring L1 First axis (axis of valve seat) L2 Second axis (axis of processing tool (grinding part))

Claims

1. A processing tool for processing an inner circumferential surface having a first axis as a central axis and an inner diameter that decreases in a predetermined direction along the first axis, A polishing section; A towing section; Equipped with the polishing portion has an outer circumferential surface that matches a shape of the inner circumferential surface and has a second axis as a central axis; the outer circumferential surface includes a polishing surface that polishes the inner circumferential surface, The pulling portion is configured to pull the center position of the polishing portion in the predetermined direction with the outer circumferential surface of the polishing portion facing the inner circumferential surface. Processing equipment.

2. The polishing unit includes: A polishing unit body including the outer circumferential surface, and A connector provided on the grinding unit body and to which the towing unit is connected having The connector connects the grinding unit body to the towing unit so as to be rotatable about the second axis.

2. The processing tool of claim 1.

3. The traction unit includes: A cord-like body that is connected to the connector and transmits a pulling force to the polishing unit body; and A pulling mechanism that applies a force to the cord-like body to pull the polishing unit body. Possesses The processing tool according to claim 2.

4. The traction mechanism includes: a first loading means for applying a force to the cord-like body that pulls the polishing unit body in the predetermined direction; and a second load means for applying a force to the cord to release the tension generated by the first load means to the cord; Possesses The processing tool according to claim 3.

5. The cord has a first end and a second end, The first end of the cord is connected to the traction mechanism, The second end of the cord-like body is connected to the connector of the polishing part, The towing portion has at least one hanging tool that is hung on a portion of the cord-like body between the first end and the second end, The cord-like body is bent by the hanging tool.

5. The processing tool according to claim 3 or 4.

6. The hanger is movable.

6. The processing tool according to claim 5.

7. A processing method using the processing tool according to claim 1, The towing process, The rotation process, Including, In the pulling step, the grinding unit is pulled in the predetermined direction by the pulling unit, In the rotating step, the grinding unit is rotated around the second axis. Processing method.

8. In the rotating step, the polishing unit is rotated from the side opposite to the side being pulled by the pulling unit. The processing method according to claim 7.

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