WO2012039385A1 - 溶接ビード切削装置および蒸気タービンのラジアルピン抜取方法 - Google Patents
溶接ビード切削装置および蒸気タービンのラジアルピン抜取方法 Download PDFInfo
- Publication number
- WO2012039385A1 WO2012039385A1 PCT/JP2011/071351 JP2011071351W WO2012039385A1 WO 2012039385 A1 WO2012039385 A1 WO 2012039385A1 JP 2011071351 W JP2011071351 W JP 2011071351W WO 2012039385 A1 WO2012039385 A1 WO 2012039385A1
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- WIPO (PCT)
- Prior art keywords
- cutting
- pin
- weld bead
- radial
- radial pin
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
- B23C3/02—Milling surfaces of revolution
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/08—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for flash removal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
- B24B23/026—Fluid driven
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/08—Portable grinding machines designed for fastening on workpieces or other parts of particular section, e.g. for grinding commutators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/0084—Other grinding machines or devices the grinding wheel support being angularly adjustable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/06—Grinders for cutting-off
- B24B27/0616—Grinders for cutting-off using a tool turning around the workpiece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/06—Grinders for cutting-off
- B24B27/0675—Grinders for cutting-off methods therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/06—Grinders for cutting-off
- B24B27/08—Grinders for cutting-off being portable
- B24B27/085—Stands therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/18—Wheels of special form
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/28—Supporting or mounting arrangements, e.g. for turbine casing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/001—Turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/28—Supporting or mounting arrangements, e.g. for turbine casing
- F01D25/285—Temporary support structures, e.g. for testing, assembling, installing, repairing; Assembly methods using such structures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/005—Repairing methods or devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49229—Prime mover or fluid pump making
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/02—Other than completely through work thickness
Definitions
- the present invention provides welding for cutting a weld bead formed on the outer periphery of the other end of a pin having one end inserted into a hole formed in the structure and the other end protruding from the surface of the structure.
- the present invention relates to a bead cutting device and a radial pin extracting method of a steam turbine using the bead cutting device.
- pins have been used in various applications such as connecting and fixing machine parts to each other, but in some cases, pins are welded to machine parts to prevent them from coming off.
- one end of the pin is inserted into a hole formed in the structure as a mechanical part, the other end of the pin is projected from the surface of the structure, and a weld bead is placed on the outer periphery of the other end. Provide. Thereby, the welding bead prevents the pin from coming off.
- a pin fixed to a structure with a weld bead in this way it is used for positioning a blade ring, a dummy ring or an inner casing with respect to the turbine casing in a steam turbine of a nuclear power plant, a thermal power plant, etc. And radial pins.
- Patent Document 1 describes a radial pin for setting positions of a turbine rotor and a blade ring or a dummy ring.
- the radial pin generally protrudes partly from the outer surface of the turbine casing, and a weld bead is formed on the outer periphery of this portion to form a turbine casing. It is fixed to.
- the radial pin when carrying out periodic inspections and remodeling work of the steam turbine, the radial pin may be pulled out and the steam turbine may be disassembled. In this case, it is necessary to remove the weld bead provided on the outer periphery of the radial pin. Conventionally, the weld bead is removed by the following method.
- FIG. 7 is a view showing a state in which the weld bead provided on the outer periphery of the radial pin is removed, (a) shows the entire turbine casing, and (b) shows the periphery of the radial pin (A in FIG. 7 (a)). (Shown area) is enlarged.
- the dedicated machine 50 is installed on the floor F via the machine mount 52, the turbine casing 1 is lifted with a crane, and moved to a predetermined position. 50 on top. At this stage, the dedicated machine 50 is mounted with a large-diameter drill 54A for drilling.
- the radial pin 2 is inserted into a through hole 3 provided in the turbine casing 1, and part of the radial pin 2 protrudes from the outer surface of the turbine casing 1, and a weld bead 4 (see FIG. 7B) is formed on this protruding portion. Is formed.
- the large-diameter hole 5 is formed in the radial pin 2 from the inside of the turbine casing 1 by the large-diameter drill 54A of the dedicated machine 50.
- the large diameter drill 54A is replaced with the small diameter drill 54B, and the through hole 6 is formed by the small diameter drill 54B.
- the two-stage drilling operation using the large-diameter drill 54A and the small-diameter drill 54B is performed by using the large-diameter hole 5 as a guide so that the turbine casing 1 is not damaged. This is to prevent the center position from shifting.
- the cutter body 56 is mounted on the dedicated machine 50, the cutter body 56 is inserted into the through hole 6 from the inside of the turbine casing 1, and the cutting blade 57 is attached to the outer peripheral surface of the cutter body 56.
- the weld bead 4 is cut.
- FIG. 7A shows the upper half of the half-structured vehicle compartment as the turbine compartment 1, but when the turbine compartment 1 is the lower half of the compartment, the compartment is divided horizontally.
- a base plate is laid over the surface, and a dedicated machine 50 is installed on the base plate via a machine mounting base 52, and the weld bead 4 is cut in the same procedure as in the upper half of the passenger compartment.
- the present invention has been made in view of the above-described circumstances. In addition to being able to cut a weld bead without forming a through-hole in a pin and having a low possibility of scratching a structure, work efficiency is good. It is another object of the present invention to provide a lightweight weld bead cutting device and a radial pin extracting method for a steam turbine using the same.
- the weld bead cutting device has a weld bead formed on the outer periphery of the other end of the pin, one end of which is inserted into a hole formed in the structure, and the other end projects from the surface of the structure.
- a cutting device for cutting the weld bead formed on the outer periphery of the pin, and the other end of the pin movably along the outer periphery of the pin And a supporting means for supporting on the end face of the section.
- this weld bead cutting device there is provided support means for supporting the cutting means for cutting the weld bead on the end face (end face of the other end) of the pin protruding from the surface of the structure so as to be movable along the outer periphery of the pin. Therefore, the weld bead can be cut without forming a through hole in the pin, and the working efficiency can be greatly improved. In addition, since no through-hole is formed in the pin, the possibility of scratching the structure can be reduced, and the torque of the weld bead cutting device can be small, so a lightweight configuration using, for example, an air grinder may be used. it can.
- the support means includes a support shaft that is erected on an end surface of the other end of the pin, a connection member that connects the cutting means to the support shaft, and the connection member. It is preferable to include a bearing that is supported so as to be rotatable around the support shaft.
- the cutting means is rotated around the support shaft along with the connecting member, and the cutting means is smoothly moved along the outer periphery of the pin. Can be moved to. Thereby, it becomes easy to cut the weld bead formed on the outer periphery of the pin without damaging the structure.
- the support shaft is screwed into a screw hole drilled as a substantially circular concentric circle having a cross section of the pin on an end surface of the other end of the pin. .
- the column shaft is screwed into the screw hole formed as a substantially concentric circle having a circular cross section of the pin on the end surface (end surface of the other end) where the pin protrudes from the surface of the structure.
- the cutting means has a cutting blade for cutting the weld bead on the distal end side in the longitudinal direction, and an angle formed by the longitudinal direction of the cutting means with respect to the support shaft is 0 degree or more. You may attach the said cutting means to the said connection member so that it may become 60 degrees or less. In this case, it is preferable to provide an angle adjusting means for adjusting an angle formed by the longitudinal direction of the cutting means with respect to the support shaft.
- the angle formed by the longitudinal direction of the cutting means with respect to the support shaft is 0 degrees or more and 60 degrees or less, the cutting operation of the weld bead by the cutting blade of the cutting means can be easily performed. Further, by providing the angle adjusting means, the cutting means can always be brought into contact with the weld bead at an appropriate angle according to the progress of the cutting operation of the weld bead.
- the weld bead cutting device preferably further includes radial position adjusting means for adjusting the position of the cutting means in the radial direction of the pin. Moreover, it is preferable that the said weld bead cutting device is further equipped with the axial direction position adjustment means which adjusts the position of the said cutting means in the axial direction of the said pin.
- the radial position adjusting means for adjusting the position of the cutting means in the radial direction of the pin or the axial position adjusting means for adjusting the position of the cutting means in the axial direction of the pin, cutting of the weld bead is performed. Depending on the progress of the operation, the cutting means can always be brought into contact with the weld bead at an appropriate position.
- the structure is a turbine casing of a steam turbine
- the pin is a radial for positioning a blade ring, a dummy ring or an inner casing of the steam turbine with respect to the turbine casing. It may be a pin.
- a method for extracting a radial pin of a steam turbine according to the present invention is used to position a blade ring, a dummy ring, or an inner casing of a steam turbine with respect to a turbine casing, and has one end in a hole formed in the turbine casing.
- the above-described weld bead cutting device is configured to insert the radial pin fixed to the turbine casing by forming a weld bead on the outer periphery of the protruding portion while the other end protrudes from the outer surface of the turbine casing.
- a step of attaching the cutting means to the end face of the other end of the radial pin via the support means, and moving the cutting means along the outer periphery of the radial pin A step of cutting the weld bead, and a step of extracting the radial pin from the turbine casing after cutting the weld bead. That.
- the cutting means is attached to the end face (end face of the other end) of the pin protruding from the surface of the turbine casing through the support means, and the cutting means is moved along the outer periphery of the radial pin.
- the welding bead is cut, the operation of forming the through hole in the radial pin can be omitted, and the working efficiency can be greatly improved.
- the through hole is not formed in the radial pin, it is possible to reduce the possibility of scratching the turbine casing (particularly, the through hole for attaching the radial pin), and the welding bead cutting device may have a small torque. It can be set as the lightweight structure using an air grinder. Further, since the radial pin is not broken, it can be reused.
- the turbine casing when the turbine casing is the upper half of the casing, the turbine casing (the upper half of the casing) is lifted with a crane, and a dedicated machine installed on the floor in advance.
- a through hole was made in the radial pin from the inside of the vehicle interior, and the weld bead was cut with a cutting blade inserted into the through hole.
- use a crane to lift and reverse the turbine compartment (the upper half of the compartment) and install the machine to shift the position of the dedicated machine to the next radial pin to be removed. It was necessary to move the platform and dedicated machine.
- the cutting means is attached to the end face of the pin protruding from the surface of the turbine casing (the end face of the other end) via the supporting means to cut the weld bead. Since it did in this way, since it can work from the outside of a turbine casing, it is not necessary to lift a turbine casing (upper half part of a casing) with a crane, and to cover on a special machine like usual. Further, as described above, the welding bead cutting device according to the present invention is lightweight and can be carried. Therefore, when shifting to the next radial pin sampling operation, the welding bead cutting device is moved to the position of the next radial pin to be extracted. It is sufficient to carry it to the end, and it is not necessary to lift and reverse the turbine casing (the upper half of the casing), move the machine mounting base and dedicated machine using a crane.
- the cutting means has a cutting blade for cutting the weld bead on the front end side in the longitudinal direction, and in the step of cutting the weld bead, the longitudinal direction of the cutting means is set to the support shaft. After roughly cutting the weld bead while moving the cutting means toward the radially inner side of the radial pin in a state of being substantially parallel to the radial pin, the longitudinal direction of the cutting means was inclined with respect to the support shaft. It is preferable to scrape off the weld bead in a state.
- the longitudinal direction of the cutting means is By scraping the weld bead while tilting it to the support shaft, the weld bead can be removed quickly and with high accuracy.
- the cutting means for cutting the weld bead is provided with the support means for supporting the end face of the pin (end face of the other end) protruding from the surface of the structure so as to be movable along the outer periphery of the pin.
- the weld bead can be cut without forming a through hole in the pin, and the working efficiency can be greatly improved.
- no through-hole is formed in the pin, not only can the possibility of scratching the structure be reduced, but the torque of the weld bead cutting device may be small, so a lightweight configuration using, for example, an air grinder should be adopted. Can do.
- FIG. 1 is a cross-sectional view showing a configuration example of a weld bead cutting device.
- FIG. 2 is a cross-sectional view showing another example of the weld bead cutting device shown in FIG.
- the weld bead for cutting the weld bead 4 of the radial pin 2 used for positioning the interior structure (blade ring, dummy ring or internal casing) 7 of the steam turbine with respect to the turbine casing 1 is described below.
- the welding bead cutting apparatus of the present invention is not limited to this example, and a welding bead of a pin partially protruding from the surface of the structure and having a welding bead formed on the outer periphery of the protruding portion is described. It can be widely applied to a cutting device.
- one end 2 ⁇ / b> A of the radial pin 2 is inserted into a through hole 3 formed in the turbine casing 1 and provided in a vehicle interior structure (blade ring, dummy ring, or internal casing) 7. Is engaged with the recess 8.
- the other end 2B of the radial pin 2 protrudes from the outer surface of the turbine casing 1 and a weld bead 4 is formed on the outer periphery thereof.
- the radial pin 2 is fixed to the turbine casing 1 by the weld bead 4.
- the weld bead 4 in the steam turbine also serves to seal the interior space of the turbine casing 1 and prevent passage of fluid (steam or air) between the inside and outside of the turbine casing 1 through the through hole 3. .
- a welding bead cutting device 10 shown in FIG. 1 includes a cutting part (cutting means) 12 for cutting the weld bead 4 formed on the outer periphery of the radial pin 2 and a support part (supporting means) for supporting the cutting part 12 on the radial pin 2. ) 20.
- the cutting part 12 has a cutting blade 14 for cutting the weld bead 4 on the distal end side in the longitudinal direction, and for example, an air grinder driven by factory air or the like can be used.
- the support portion 20 that supports the cutting portion 12 includes a support shaft 22 erected on the end surface 2C of the other end 2B of the radial pin 2, a connection member 24 that connects the cutting portion 12 to the support shaft 22, and a connection member 24. And a fitting member 28 that fits with the other end 2B of the radial pin 2.
- the support shaft 22 passes through the connecting member 24 and the fitting member 28, and is screwed into the screw hole 9 provided in the end surface 2C of the other end 2B of the radial pin 2.
- the screw hole 9 is preferably formed in the end surface 2C as a circular substantially concentric circle that forms a cross section of the radial pin 2.
- the connecting member 24 incorporates a screw feed mechanism (radial position adjusting means) 30 so that the position of the cutting portion 12 (cutting blade 14) in the radial direction of the radial pin 2 can be adjusted. Thereby, according to the progress of the cutting operation of the weld bead 4, the cutting blade 14 of the cutting part 12 can always be brought into contact with the weld bead 4 at an appropriate position.
- the screw feed mechanism 30 includes a handle 32 attached to the end, a feed screw 34 extending along the radial direction of the radial pin 2, and a feed nut 36 to which the cutting part 12 is attached.
- the feed screw 34 is supported by the coupling member 24 by a bearing (not shown) so that it can rotate with the handle 32.
- this screw feed mechanism 30 when torque is input to the feed screw 34 via the handle 32, the cutting portion 12 moves together with the feed nut 36 in the radial direction of the radial pin 2 as the feed screw 34 rotates (see FIG. ("Cutting part moving direction" indicated by 1)).
- the bearing 26 is provided between the connecting member 24 and the fitting member 28, and supports the connecting member 24 so that the connecting member 24 can rotate around the support shaft 22 with respect to the fitting member 28.
- the fitting member 28 is fitted to the other end 2B of the radial pin 2, the fitting member 28 is basically immovable when the connecting member 24 rotates.
- the other end 2B of the radial pin 2 is a polygon (for example, a hexagon) centered on the axial direction of the radial pin 2, and the fitting member 28 has a recess 29 having a shape corresponding to the polygon.
- the fitting member 28 is locked by the other end 2B of the radial pin 2.
- the cutting part 12 is turned around the support shaft 22 together with the connecting member 24 to perform cutting.
- the cutting blade 14 of the part 12 can be smoothly moved along the outer periphery of the radial pin 2. Thereby, it becomes easy to cut the weld bead 4 formed on the outer periphery of the radial pin 2 without damaging the turbine casing 1.
- the cutting portion 12 is mounted on the connecting member 24 so that the longitudinal direction thereof is along the axial direction of the radial pin 2 (the axial direction of the support shaft 22).
- the cutting portion 12 may be attached to the connecting member 24 in a state where it is inclined with respect to the axial direction of the radial pin 2 (the axial direction of the support shaft 22).
- the weld bead cutting device 60 shown in FIG. 2 has the same configuration as the weld bead cutting device 10 of FIG. 1 except for the mounting mode (angle) of the cutting portion 12, it is common to the weld bead cutting device 10. Elements are denoted by the same reference numerals and description thereof is omitted.
- the angle ⁇ (see FIG. 2) formed by the longitudinal direction of the cutting portion 12 and the axial direction of the support shaft 22 is not less than 0 degrees and not more than 60 degrees.
- the angle ⁇ formed by the longitudinal direction of the cutting portion 12 and the axial direction of the support shaft 22 is 0 degree.
- FIG. 3 is a view showing a state where the radial pin 2 of the steam turbine is extracted.
- FIG. 4 is an enlarged view showing the periphery of the weld bead 4 at each stage of FIG.
- the weld bead cutting device 10 is mounted on the end surface 2 ⁇ / b> C of the other end 2 ⁇ / b> B of the radial pin 2.
- the connecting member 24, the fitting member 28, and the bearing 26 are assembled, and the cutting portion 12 is attached to the connecting member 24 in advance.
- the other end 2 ⁇ / b> B of the radial pin 2 is fitted into the recess 29 of the fitting member 28.
- the support shaft 22 is inserted into a through hole (not shown) provided in the connecting member 24 and the fitting member 28 and screwed into the screw hole 9 provided in the other end 2B of the radial pin 2.
- the radial pin is moved while moving the cutting portion 12 inward in the radial direction of the radial pin 2 (in the direction of the arrow in FIG. 4) in a state where the longitudinal direction of the cutting portion 12 is substantially parallel to the support shaft 22.
- the cutting part 12 (cutting blade 14) is circulated along the outer periphery of 2 to roughly cut the weld bead 4. As a result, most of the weld bead 4 is removed, but the weld bead 4 that has entered the gap between the through hole 3 of the turbine casing 1 and the other end 2B of the radial pin 2 remains without being removed.
- the weld bead cutting device 60 is mounted on the end surface 2 ⁇ / b> C of the other end 2 ⁇ / b> B of the radial pin 2 instead of the weld bead cutting device 10.
- a specific mounting procedure is the same as that of the weld bead cutting device 10. Then, in a state where the longitudinal direction of the cutting portion 12 is inclined with respect to the support shaft 22, the cutting portion 12 (cutting blade 14) is circulated along the outer periphery of the radial pin 2 and the remaining weld bead 4 is scraped off.
- the weld bead cutting device 10 while moving the cutting part 12 toward the radially inner side of the radial pin 2 in a state where the longitudinal direction of the cutting part 12 is substantially parallel to the support shaft 22.
- the weld bead 4 is scraped off with the weld bead cutting device 60 in a state where the longitudinal direction of the cutting portion 12 is inclined to the support shaft 22, thereby quickly and accurately removing the weld bead 4. Can be done.
- the radial pin 2 from which the weld bead 4 has been completely removed is hit with a hammer or the like to be extracted from the through hole 3 of the turbine casing 1, and a screw hole provided in the end surface 2 ⁇ / b> C of the other end 2 ⁇ / b> B of the radial pin 2. 9 is used to attach a hook, and the radial pin 2 is lifted by a crane. In this way, the radial pin 2 is extracted from the through hole 3 of the turbine casing 1.
- the weld bead cutting devices 10 and 60 of the present embodiment have the cutting portion 12 that cuts the weld bead 4 formed on the outer periphery of the radial pin 2, and the cutting portion 12 that is the outer periphery of the radial pin 2.
- a support portion 20 that is supported on the end surface 2C of the other end portion 2B of the radial pin 2 so as to be movable along
- the support part 20 has the support
- a bearing 26 that supports the shaft 22 so as to be rotatable around the shaft 22.
- the end surface 2C (the other end 2B) of the radial pin 2 is movable along the outer periphery of the radial pin 2 so that the cutting portion 12 (the cutting blade 14) that cuts the weld bead 4 can be moved. Since the support portion 20 is provided to be supported on the end face), the weld bead 4 can be cut without forming a through hole in the radial pin 2, and the working efficiency can be greatly improved.
- the weld bead cutting device 10 is mounted on the end surface 2C of the other end 2B of the radial pin 2, and the radial pin is in a state where the longitudinal direction of the cutting portion 12 is substantially parallel to the support shaft 22.
- the weld bead cutting device 60 is replaced with the end face 2 ⁇ / b> C of the other end 2 ⁇ / b> B of the radial pin 2 in place of the weld bead cutting device 10.
- the weld bead 4 is scraped off while the longitudinal direction of the cutting portion 12 is tilted with respect to the support shaft 22, and the radial pin 2 from which the weld bead 4 has been removed is finally removed from the through hole 3 of the turbine casing 1.
- the radial pin extraction method has been described.
- the weld bead cutting devices 10 and 60 are used to support the end face 2C (end face of the other end 2B) of the radial pin 2 protruding from the outer surface of the turbine casing 1 via the support portion 20. Since the cutting part 12 is attached and the weld bead 4 is cut, the work can be performed from the outside of the turbine casing 1. Further, since the weld bead cutting devices 10 and 60 are lightweight and can be carried, when the next radial pin 2 is extracted, the weld bead cutting devices 10 and 60 are moved to the position of the next radial pin 2 to be extracted. It is sufficient to carry it, and it is not necessary to lift and reverse the turbine casing 1 and move the machine mounting base and dedicated machine using a crane.
- the example in which the cutting portion 12 is supported on the end surface 2C of the radial pin 2 by the support portion 20 including the support shaft 22, the coupling member 24, the bearing 26, and the fitting member 28 has been described.
- the support portion for supporting the is not limited to this example, and various configurations can be adopted as follows.
- FIG. 5 is a cross-sectional view showing a configuration of a weld bead cutting device according to a modification. Since the weld bead cutting device 70 shown in the figure is the same as the weld bead cutting device 10 described in the first embodiment except for the configuration of the support portion that supports the cutting portion 12, it is common to the weld bead cutting device 10. The same reference numerals are assigned to the elements to be described, and the description thereof is omitted.
- the support portion 72 of the weld bead cutting device 70 is provided on the outer periphery of the support shaft 22 erected on the end surface 2 ⁇ / b> C of the other end 2 ⁇ / b> B of the radial pin 2 and along the support shaft 22.
- the cutting blade 14 of the cutting portion 12 can be smoothly moved along the outer periphery of the radial pin 2 in the same manner as the support portion 20 described in the above embodiment.
- the support part that supports the cutting part 12 has any configuration as long as the cutting part 12 can be supported on the end surface 2C of the radial pin 2 so as to be movable along the outer periphery of the radial pin 2.
- a slide bearing may be used instead of the bearing 26, or the bearing 26 itself may be omitted.
- the bearing 26 is omitted, either one of the circular concave portion and the convex portion is provided on the member that does not perform the circular motion, and the other member is provided on the member that performs the circular motion, and the concave portion and the convex portion of both the members are fitted.
- the orbiting motion is restricted, and the cutting portion 12 can be appropriately orbited along a predetermined trajectory.
- the cutting part Angle adjusting means for adjusting the angle formed by the longitudinal direction of the column 12 with respect to the support shaft 22 and axial position adjusting means for adjusting the position of the cutting portion 12 in the axial direction of the support shaft 22 may be provided.
- FIG. 6 is a cross-sectional view showing a configuration example of the angle adjusting means and the axial position adjusting means.
- a cutting portion holder 82 is attached to the feed nut 36 of the screw feed mechanism 30 via a receiving plate 80.
- the cutting part holder 82 has the cutting part 12 in a circular hole formed by arranging the first plate part 82A and the second plate part 82B each having a semicircular groove so that the semicircular grooves face each other.
- the cutting part 12 is fixed by being clamped and tightened with a pair of bolts (axial position adjusting means) 84. Further, the cutting part holder 82 is fixed to the receiving plate 80 by bolts 84.
- the receiving plate 80 is fixed to the feed nut 36 by bolts (angle adjusting means) 86.
- the receiving plate 80 is rotated around the bolt 86 by a desired angle, the bolt 86 is tightened, and the cutting portion holder 82 and the cutting portion 12 are attached to the receiving plate 80, so that the cutting portion
- the angle formed by the longitudinal direction of 12 with respect to the support shaft 22 can be adjusted.
- the cutting portion 12 is moved by a desired amount along the longitudinal direction in the state where the bolt 84 is loosened, the cutting portion 12 (the cutting blade 14) in the axial direction of the column shaft 22 is tightened by tightening the bolt 84. Can be adjusted.
- the cutting part 12 can always be brought into contact with the weld bead 4 at an appropriate angle and position. Moreover, if it comprises so that the angle which the longitudinal direction of the cutting part 12 makes with respect to the support
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Abstract
Description
はじめに、図7(a)に示すように、機械取付台52を介して専用機械50をフロアF上に設置しておき、タービン車室1をクレーンで吊り上げ、所定の位置まで移動させて専用機械50の上にかぶせる。なお、この段階では、専用機械50には穿孔用の大径ドリル54Aが装着されている。一方、ラジアルピン2は、タービン車室1に設けられた貫通穴3に挿入され、一部がタービン車室1の外表面から突出し、この突出部に溶接ビード4(図7(b)参照)が形成されている。
タービン車室1を専用機械50上にかぶせた状態で、図7(b)に示すように、専用機械50の大径ドリル54Aによってタービン車室1の内側からラジアルピン2に大径孔5を形成した後、大径ドリル54Aを小径ドリル54Bに交換し、小径ドリル54Bによって貫通孔6を形成する。ここで、大径ドリル54A及び小径ドリル54Bを用いた2段階の穿孔作業を行うのは、タービン車室1に傷が付かないように、大径孔5をガイドとして利用して貫通孔6のセンタ位置のずれを防止するためである。
この後、カッタ本体56を専用機械50に装着し、このカッタ本体56をタービン車室1の内側から貫通孔6に挿入し、カッタ本体56の外周面に切削刃57を取り付けて、専用機械50によりカッタ本体56を回転させることで、溶接ビード4の切削を行う。
また、ラジアルピン2に大径孔5及び貫通孔6を形成するために大トルクが必要であり、電動モータを搭載した大型の専用機械50を使用せざるを得なかった。このため、専用機械50の位置をずらす際、専用機械50自体をクレーンで吊り上げて移動させる必要があった。
また、ピンに貫通孔を形成しないので、構造物に傷を付ける可能性を低減できるとともに、溶接ビード切削装置のトルクは小さくても足りるから、例えばエアグラインダを用いた軽量の構成とすることができる。
この場合、前記切削手段の長手方向が前記支柱軸に対してなす角度を調節する角度調節手段を備えることが好ましい。
また上記溶接ビード切削装置は、前記ピンの軸方向における前記切削手段の位置を調節する軸方向位置調節手段をさらに備えることが好ましい。
また、ラジアルピンに貫通孔を形成しないので、タービン車室(特にラジアルピン取付用の貫通穴)に傷を付ける可能性を低減できるとともに、溶接ビード切削装置のトルクは小さくても足りるから、例えばエアグラインダを用いた軽量の構成とすることができる。また、ラジアルピンが破断されないことから、その再利用を図ることも可能である。
一方、タービン車室が車室下半部である場合、車室下半部の水平分割面上に台板を架け渡して、この台板上に機械取付台を介して専用機械を設置して、車室上半部の場合と同様の手順で溶接ビードの切削を行うとともに、次のラジアルピンの抜取作業に移行する際、専用機械をクレーンで吊り上げて次の抜取対象のラジアルピンの位置まで移動させる必要があった。
また上述のように、本発明に係る溶接ビード切削装置は軽量で持ち運びが可能であるから、次のラジアルピンの抜取作業に移行する際、溶接ビード切削装置を次の抜取対象のラジアルピンの位置まで持ち運べば足り、クレーンを用いた、タービン車室(車室上半部)の吊り上げ・反転、機械取付台及び専用機械の移動等は行う必要がない。
また、ピンに貫通孔を形成しないので、構造物に傷を付ける可能性を低減できるだけでなく、溶接ビード切削装置のトルクは小さくても足りるから、例えばエアグラインダを用いた軽量の構成とすることができる。
なお、以下では、蒸気タービンの車室内構造物(翼環、ダミー環又は内部車室)7をタービン車室1に対して位置決めするために用いられるラジアルピン2の溶接ビード4を切削する溶接ビード切削装置について説明するが、本発明の溶接ビード切削装置は、この例に限定されず、構造物の表面から一部が突出し、この突出部の外周に溶接ビードが形成されたピンの溶接ビードを切削する装置に広く適用することができる。
なお、嵌合部材28は、ラジアルピン2の他端部2Bに嵌合しているから、連結部材24の周回運動時において基本的に不動である。具体的には、ラジアルピン2の他端部2Bは、ラジアルピン2の軸方向を中心とする多角形(例えば六角形)であり、嵌合部材28はこの多角形に対応する形状の凹部29を有しており、嵌合部材28はラジアルピン2の他端部2Bによって係止されている。
具体的には、図1に示すように、連結部材24、嵌合部材28及びベアリング26を組み立てておき、連結部材24に切削部12を予め装着しておく。そして、嵌合部材28の凹部29にラジアルピン2の他端部2Bを嵌合させる。この状態で、連結部材24及び嵌合部材28に設けられた貫通孔(不図示)に支柱軸22を挿通し、ラジアルピン2の他端部2Bに設けられたねじ穴9に螺着する。
そして、切削部12の長手方向を支柱軸22に対して傾けた状態で、ラジアルピン2の外周に沿って切削部12(切削刃14)を周回させて残りの溶接ビード4を削り取る。
また、ラジアルピン2に貫通孔を形成しないので、タービン車室1(具体的には貫通穴3)に傷を付ける可能性を低減できるとともに、溶接ビード切削装置10,60の切削部12のトルクは小さくても足りるから、例えばエアグラインダを用いた軽量の構成とすることができる。
また溶接ビード切削装置10,60は軽量で持ち運びが可能であるから、次のラジアルピン2の抜取作業に移行する際、溶接ビード切削装置10,60を次の抜取対象のラジアルピン2の位置まで持ち運べば足り、クレーンを用いた、タービン車室1の吊り上げ・反転、機械取付台及び専用機械の移動等は行う必要がない。
また、ボルト84を緩めた状態で、切削部12をその長手方向に沿って所望量だけ移動させた後、ボルト84を締付けることで、支柱軸22の軸方向における切削部12(切削刃14)の位置を調節することができる。
Claims (10)
- 構造物に形成された穴に一端部が挿入され、前記構造物の表面から他端部が突出するピンの該他端部の外周に形成された溶接ビードを切削するための切削装置であって、
前記ピンの外周に形成された前記溶接ビードを切削する切削手段と、
前記切削手段を、前記ピンの外周に沿って移動自在に前記ピンの前記他端部の端面に支持する支持手段とを備えることを特徴とする溶接ビード切削装置。 - 前記支持手段は、
前記ピンの前記他端部の端面に立設される支柱軸と、
前記切削手段を前記支柱軸に連結する連結部材と、
前記連結部材を、前記支柱軸を中心として周回自在に支持するベアリングとを含むことを特徴とする請求項1に記載の溶接ビード切削装置。 - 前記支柱軸は、前記ピンの前記他端部の端面に、前記ピンの断面をなす円形状の略同心円として穿設されたねじ穴に螺着されていることを特徴とする請求項2に記載の溶接ビード切削装置。
- 前記切削手段は、その長手方向の先端側に前記溶接ビードを切削する切削刃を有し、
前記切削手段の長手方向が前記支柱軸に対してなす角度が0度以上60度以下となるように、前記切削手段は前記連結部材に取り付けられていることを特徴とする請求項2又は3に記載の溶接ビード切削装置。 - 前記切削手段の長手方向が前記支柱軸に対してなす角度を調節する角度調節手段をさらに備えることを特徴とする請求項4に記載の溶接ビード切削装置。
- 前記ピンの径方向における前記切削手段の位置を調節する径方向位置調節手段をさらに備えることを特徴とする請求項1乃至5のいずれか一項に記載の溶接ビード切削装置。
- 前記ピンの軸方向における前記切削手段の位置を調節する軸方向位置調節手段をさらに備えることを特徴とする請求項1乃至6のいずれか一項に記載の溶接ビード切削装置。
- 前記構造物は、蒸気タービンのタービン車室であり、
前記ピンは、蒸気タービンの翼環、ダミー環又は内部車室を前記タービン車室に対して位置決めするためのラジアルピンであることを特徴とする請求項1乃至7のいずれか一項に記載の溶接ビード切削装置。 - 蒸気タービンの翼環、ダミー環又は内部車室をタービン車室に対して位置決めするために用いられ、前記タービン車室に形成された穴に一端部が挿入され、前記タービン車室の外表面から他端部が突出すると共に該突出した部位の外周に溶接ビードを形成することで前記タービン車室に固着したラジアルピンを請求項1に記載の溶接ビード切削装置を用いて抜き取る方法であって、
前記支持手段を介して、前記ラジアルピンの前記他端部の端面に前記切削手段を取り付ける工程と、
前記ラジアルピンの外周に沿って前記切削手段を移動させながら、前記溶接ビードを切削する工程と、
前記溶接ビードを切削した後、前記ラジアルピンを前記タービン車室から抜き取る工程とを備えることを特徴とする蒸気タービンのラジアルピン抜取方法。 - 前記切削手段は、その長手方向の先端側に前記溶接ビードを切削する切削刃を有し、
前記溶接ビードを切削する工程では、前記切削手段の長手方向を前記支柱軸に対して略平行とした状態で前記ラジアルピンの径方向内方に向けて前記切削手段を移動させながら前記溶接ビードを荒削りした後、前記切削手段の長手方向を前記支柱軸に対して傾けた状態で前記溶接ビードを削り取ることを特徴とする請求項9に記載の蒸気タービンのラジアルピン抜取方法。
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EP20110826830 EP2565390A4 (en) | 2010-09-24 | 2011-09-20 | WELDING CUTTING DEVICE AND METHOD FOR EXTRACTION OF RADIAL PENCILS FROM A STEAM TURBINE |
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CN201552315U (zh) * | 2009-11-24 | 2010-08-18 | 安徽淮化股份有限公司 | 一种现场拆除大规格螺栓的专用工具 |
-
2010
- 2010-09-24 JP JP2010214415A patent/JP5524005B2/ja not_active Expired - Fee Related
-
2011
- 2011-09-20 CN CN201180032306.XA patent/CN102971496B/zh not_active Expired - Fee Related
- 2011-09-20 EP EP20110826830 patent/EP2565390A4/en not_active Withdrawn
- 2011-09-20 KR KR1020127034121A patent/KR101459206B1/ko not_active IP Right Cessation
- 2011-09-20 WO PCT/JP2011/071351 patent/WO2012039385A1/ja active Application Filing
- 2011-09-21 US US13/238,609 patent/US9126272B2/en not_active Expired - Fee Related
Patent Citations (4)
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JPS56142894U (ja) * | 1980-03-21 | 1981-10-28 | ||
JPS6117104U (ja) | 1984-07-04 | 1986-01-31 | 三菱重工業株式会社 | タ−ビンロ−タと翼環等との位置設定ラジアルピン |
JPH0256520U (ja) * | 1988-10-18 | 1990-04-24 | ||
JPH04201053A (ja) * | 1990-11-28 | 1992-07-22 | Hitachi Ltd | 研削装置 |
Non-Patent Citations (1)
Title |
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See also references of EP2565390A4 * |
Also Published As
Publication number | Publication date |
---|---|
US9126272B2 (en) | 2015-09-08 |
KR20130023285A (ko) | 2013-03-07 |
EP2565390A1 (en) | 2013-03-06 |
CN102971496A (zh) | 2013-03-13 |
US20120073132A1 (en) | 2012-03-29 |
CN102971496B (zh) | 2015-04-01 |
JP2012067703A (ja) | 2012-04-05 |
EP2565390A4 (en) | 2014-12-24 |
JP5524005B2 (ja) | 2014-06-18 |
KR101459206B1 (ko) | 2014-11-07 |
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