CN114932466A - Method and tool for polishing inner hole of stainless steel elbow for small-angle small-caliber nuclear power - Google Patents
Method and tool for polishing inner hole of stainless steel elbow for small-angle small-caliber nuclear power Download PDFInfo
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- CN114932466A CN114932466A CN202210635545.4A CN202210635545A CN114932466A CN 114932466 A CN114932466 A CN 114932466A CN 202210635545 A CN202210635545 A CN 202210635545A CN 114932466 A CN114932466 A CN 114932466A
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- 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
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
- B24B5/40—Single-purpose machines or devices for grinding tubes internally
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- 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
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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- 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
- B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
- B24B29/02—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces
- B24B29/04—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces for rotationally symmetrical workpieces, e.g. ball-, cylinder- or cone-shaped workpieces
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- 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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/067—Work supports, e.g. adjustable steadies radially supporting workpieces
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- 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
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
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- 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
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/003—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving acoustic means
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- 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
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/02—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
- B24B49/04—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent involving measurement of the workpiece at the place of grinding during grinding operation
- B24B49/045—Specially adapted gauging instruments
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- 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
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention discloses a method and a tool for polishing inner holes of small-angle small-caliber nuclear power stainless steel bent pipes, and solves the problem that the existing stainless steel bent pipes with high strength, large diameter and thick wall are difficult to polish. The grinding tool comprises a grinding machine, a connecting rod, a handle and a power device, wherein the connecting rod, the handle and the power device are sequentially connected with the grinding machine, the power device is used for driving the grinding machine, a supporting disk is sleeved on the connecting rod through a universal ball joint bearing, a plurality of supporting holes are uniformly formed in the supporting disk, and supporting rods are inserted in the supporting holes. The invention relates to a method for polishing an inner hole of a small-angle small-caliber nuclear power stainless steel bent pipe. The method has the advantages of simple process, easy operation, convenient polishing of the inner hole of the stainless steel elbow for small-angle small-caliber nuclear power, high surface quality of the processed inner hole, and suitability for the inner hole of the stainless steel elbow with different bending angles. The tool has the advantages of simple structure, easy disassembly and assembly and maintenance, flexibility and good adaptability.
Description
Technical Field
The invention relates to the field of bent pipe machining, in particular to a method and a tool for polishing an inner hole of a small-angle small-caliber nuclear power stainless steel bent pipe.
Background
The high-strength, large-diameter and thick-wall stainless steel bent pipe is an important part of industrial equipment, and particularly has wide application in the fields of petrochemical industry and nuclear power. The existing pipe bending process mainly comprises press bending, push bending, wrap bending and the like, and the pipe blank bent by adopting the pipe bending process schemes can not avoid large bidirectional pressure stress in the pipe bending section, so that the pipe bending section and the wall thickness are uneven, and even the inner arc section has wrinkling phenomena. According to the design requirements of pipelines, the wall thickness of the pipeline is required to be higher, and the inner wall of the pipeline is required to be smooth. To meet these requirements, the inner bore of the pipe must be machined a second time after the pipe is bent. But the method of machining the inner hole is difficult to realize, and particularly for the small-diameter small-angle elbow with the inner hole diameter of less than 300mm and the bending angle of less than 120 degrees.
. The main reasons for this are: the straight pipe sections on the left side and the right side of the elbow are longer, generally more than 2000mm, the cutter bar cantilever is too long and the cutter bar is restricted by the inner wall of the elbow, and the inner hole processing of the elbow area can not be finished. Only manual grinding can be adopted.
The difficulty of manual polishing is adopted: (1) after the pipe is bent, the straight pipe sections on the left side and the right side are longer and larger than 2000mm, the diameter of an inner hole of the bent pipe is smaller than 300, and the depth can not be reached by a common pneumatic grinding machine. (2) With the angle of the bent pipe becoming smaller, the grinding difficulty is increased, and a vision blind area exists in the inner arc area of the bent pipe (as shown in figures 1 and 4). (3) When the angle of the bent pipe is less than 120 degrees, the bent pipe area is difficult to visually check. (4) The requirement on the surface quality of the inner hole of the bent pipe is high, the requirements that the wall thickness is uniform, the wall thickness difference is controlled within 1mm, and the surface roughness is Ra3.2 are met, and the requirement on the surface processing of the inner hole of the stainless steel bent pipe is difficult to meet due to the fact that the secondary damage is easily caused to the surface of the bent pipe during manual operation.
Disclosure of Invention
The invention aims to solve the technical problems and provides the method for polishing the inner hole of the small-angle small-caliber nuclear power stainless steel elbow, which is simple in process, easy to operate, capable of conveniently polishing the inner hole of the small-angle small-caliber nuclear power stainless steel elbow, high in surface quality of the machined inner hole and suitable for different bending angles.
The invention also provides a small-angle small-caliber polishing tool for the inner hole of the stainless steel elbow for nuclear power, which is used in the polishing method.
The invention discloses a polishing tool for inner holes of small-angle small-caliber stainless steel bent pipes for nuclear power, which comprises a polisher, a connecting rod, a handle and a power device for driving the polisher, wherein the connecting rod, the handle and the power device are sequentially connected with the polisher, a supporting disk is sleeved on the connecting rod through a universal ball joint bearing, a plurality of supporting holes are uniformly formed in the supporting disk, and supporting rods are inserted in the supporting holes.
The thickness of the supporting disc is 0-30mm greater than that of the universal ball joint bearing.
The clearance between the supporting disc and the pipe wall is controlled between 0.5mm and 1 mm.
The sander, the connecting rod, the handle and the power device are detachably connected.
The supporting disc and the supporting rod are made of nylon or bakelite.
The power device is an air compressor, the polisher is a pneumatic polisher, and a power outlet of the air compressor is communicated with the pneumatic polisher through a hollow handle and a connecting rod.
And a joint is further connected between the grinding machine and the connecting rod, and a ratchet mechanism is arranged on the joint.
And a joint can be detachably connected between the grinding machine and the connecting rod.
The invention discloses a method for polishing an inner hole of a stainless steel elbow with a small angle and a small caliber for nuclear power, which comprises the following steps of sequentially polishing an outer arc area and an inner arc blind area of an inner hole of an elbow:
wherein, the outer circular arc area is polished by the following steps:
A1) placing an inner hole sight glass at one end of the stainless steel bent pipe, and adjusting the position of the inner hole sight glass until the surface of the workpiece to be polished can be clearly seen;
A2) coarse grinding: extending the grinding tool for the inner hole of the bent pipe according to any one of claims 1 to 5 from one end of the inner hole of the stainless steel bent pipe into the bent pipe section, and starting the grinding machine to perform rough grinding on the outer circular arc area of the inner hole to half of the bent pipe section; meanwhile, the polishing position of the grinding head is adjusted through monitoring of an inner hole sight glass, the polishing machine is turned off after coarse grinding is finished, and a bent pipe inner hole polishing tool is withdrawn;
A3) fine grinding: replacing a grinding head of a grinding machine of the grinding tool for the inner hole of the bent pipe with a fine grinding head, stretching into the bent pipe section again, starting the grinding machine to polish the outer circular arc area of the inner hole to a half of the bent pipe section; and simultaneously, the polishing position of the polishing device is adjusted through monitoring of the inner hole sight glass, the wall thickness of the pipeline is controlled by using a wall thickness measuring instrument, the polishing machine is turned off after polishing is finished, and the polishing tool of the inner hole of the bent pipe is withdrawn.
A4) Polishing: replacing a grinding head of a grinding machine of the grinding tool for the inner hole of the bent pipe with a polishing grinding head, extending into the bent pipe section again, starting the grinding machine to polish the outer circular arc area of the inner hole to a half of the bent pipe section; and simultaneously, the polishing position of the polishing device is adjusted through monitoring of the inner hole sight glass, the wall thickness of the pipeline is controlled by using a wall thickness measuring instrument, the polishing machine is turned off after polishing and polishing are finished, and the polishing tool of the inner hole of the bent pipe is withdrawn.
The inner arc blind area is polished by the following steps:
B1) coarse grinding: extending the elbow inner hole grinding tool according to claim 7 or 8 into the elbow section from one end of the stainless steel elbow inner hole, starting the grinding machine to perform rough grinding on the inner arc blind area of the inner hole, and performing rough grinding to half of the elbow section; meanwhile, the polishing position of the grinding head is adjusted through monitoring of the inner hole sight glass, the inclination angle of the polishing machine and the connecting rod is adjusted through a ratchet mechanism on the joint, so that the grinding head can completely contact the inner wall of the inner arc blind area of the inner hole of the bent pipe, the polishing machine is turned off after coarse grinding is finished, and the bent pipe inner hole polishing tool is withdrawn;
B2) fine grinding: replacing a grinding head of a grinding machine of the grinding tool for the inner hole of the bent pipe with a fine grinding head, extending one end of the inner hole of the bent pipe of the workpiece into the bent pipe section of the workpiece, starting the grinding machine to polish the inner arc blind area to a half of the bent pipe section; meanwhile, the polishing position of the polishing device is adjusted through monitoring of an inner hole sight glass, the wall thickness of the pipeline is controlled through a wall thickness difference measuring instrument, the inclination angle of the polishing machine and a connecting rod is adjusted through a ratchet mechanism on a joint, so that a grinding head can completely contact the inner wall of an inner arc blind area of an inner hole of the bent pipe, the polishing machine is turned off after polishing is completed, and a bent pipe inner hole polishing tool is withdrawn;
B3) polishing: replacing a grinding head of a grinding machine of the grinding tool for the inner hole of the bent pipe with a polishing grinding head, extending one end of the inner hole of the bent pipe of the workpiece into the bent pipe section of the workpiece, starting the grinding machine to polish the inner arc blind area to a half of the bent pipe section; meanwhile, the polishing position of the polishing device is adjusted through monitoring of the inner hole sight glass, the inclination angle of the polishing machine and the connecting rod is adjusted through a ratchet mechanism on the joint, so that the polishing head can completely contact the inner wall of the inner arc blind area of the inner hole of the bent pipe, the polishing machine is turned off after polishing and polishing are finished, and the bent pipe inner hole polishing tool is withdrawn;
after the steps are completed, the stainless steel elbow is turned, the steps of polishing the outer circular arc area and polishing the inner circular arc blind area of the inner hole of the elbow are repeated, and the other half of the inner hole of the stainless steel elbow is polished.
In the step of polishing the outer circular arc area, in A2), assembling a brown corundum grinding wheel on a grinding head of the polishing machine; A3) in the middle, a grinding head of the grinding machine is provided with a hundred-impeller grinding head with the granularity of 80-120; A4) in the middle, a grinding head of the grinding machine is provided with a 320-granularity abrasive belt;
in the step of polishing the inner arc blind area, B1), assembling a brown corundum grinding wheel on a grinding head of the polishing machine; B2) in the middle, a grinding head of the grinding machine is provided with a hundred-impeller grinding head with the granularity of 80-120. B3) In the middle, a grinding head of the grinding machine is provided with a 320-granularity abrasive belt;
has the beneficial effects that:
1) according to the polishing tool, a connecting rod is sleeved with a supporting disk through a universal ball joint bearing, the supporting disk is supported on the hole wall of an inner hole of a stainless steel bent pipe, the connecting rod symmetrically swings on two sides of the supporting disk through a universal shaft, and the lengths of two sides of the supporting disk are connected through controlling the mounting position of the supporting disk, so that the purposes of labor saving and convenience in operation can be achieved by ingeniously utilizing the lever principle;
2) the thickness of supporting disk should not be too thick, otherwise be difficult to provide the sufficient angle space of bracing piece, therefore the inventor is in when reducing the thickness of supporting disk evenly open on the supporting disk has a plurality of supported holes, the sufficient holding power is assisted for the supporting disk to the bracing piece cartridge bracing piece in the supported hole, utilizes the bracing piece to provide for the supporting disk, and the bracing piece is the line contact with the contact of becoming the inside pipe wall, when guaranteeing to support intensity, has also given the sufficient activity space of bracing piece, satisfies the demand of different angles of polishing, connects the rotation that the pole can carry out arbitrary direction in the hole, carries out the circumference and polishes, has improved the precision of polishing greatly. Preferably supporting disk and bracing piece adopt nylon or bakelite to make, avoid rigid material direct action to lead to the secondary damage to the hole wall in the hole.
3) Preferably, the gap between the supporting disc and the pipe wall is controlled to be 0.5-1 mm, the thickness of the supporting disc is 0-30mm larger than that of the universal ball joint bearing, and the length of the supporting rod is preferably 300 mm. The shortest distance between the supporting hole and the edge of the supporting disk is 5-10 mm.
4) The invention adopts a dividing area to polish based on whether the outer circular arc area is visible or not, the dividing area is divided into an outer circular arc area and an inner circular arc blind area, and a polishing tool without a joint is adopted when the outer circular arc area is polished; in the inner arc blind area, because the bent angle of the inner arc blind area exceeds the visual angle, the grinding tool with the joint is adopted in a matching way, and because the ratchet mechanism is arranged on the joint, the turning angle of the joint can be adjusted through the ratchet device, so that the requirement of the contact angle between the grinding machine and the stainless steel bent pipe can be met in the inner arc blind area.
5) In the method, the surface quality of the inner hole of the bent pipe is ensured by the detection means of the wall thickness measuring instrument and the ultrasonic flaw detector.
6) The tool has the advantages of simple structure, convenient use, time and labor saving, flexible disassembly of each part, easy operation, convenience and rapidness for polishing the inner hole of the stainless steel elbow for nuclear power, and is particularly suitable for small-caliber small-angle elbows with the diameters of the inner holes of the elbows being less than 300mm and the bending angles of the elbows being less than 120 degrees. The method of the invention has the advantages of high surface quality and uniform wall thickness of the inner hole after processing, meets the processing requirements on the surface of the inner hole, and is suitable for stainless steel bent pipes with longer straight pipe sections and different bending angles.
Drawings
Fig. 1 is a schematic structural view of a stainless steel elbow.
FIG. 2 is a schematic view of the outer circular arc polishing state of the present invention.
FIG. 3 is a schematic view of the polishing state of the inner arc dead zone of the present invention.
Fig. 4 is a top view of the support tray.
Wherein: 1-stainless steel bent pipe, 11-outer circular arc area, 12-inner circular arc blind area, 2-bent pipe inner hole grinding tool, 21-grinding head, 22-grinding machine, 23-joint, 24-supporting rod, 25-supporting disk, 26-universal ball joint bearing, 27-connecting rod, 28-handle, 29-switch, 30-air compressor, 31-supporting hole and 3-inner hole sight glass.
Detailed Description
The tool of the present invention is further explained below with reference to the accompanying drawings:
referring to fig. 2 and 3, the grinding tool 2 for grinding the inner hole of the elbow pipe comprises a joint 23, a connecting rod 27, a handle 28 and a power device for driving the grinding machine 22, which are sequentially connected with the grinding machine 22, in this embodiment, the grinding machine 22 is a pneumatic grinding machine, the power device is an air compressor 30, and when the pneumatic grinding is adopted, a power outlet of the air compressor 30 is communicated with the pneumatic grinding machine 22 through the hollow handle 28, the connecting rod 27, the joint 23 and the pneumatic grinding machine 22 so as to drive the pneumatic grinding machine 22 to work.
Those skilled in the art can also select electric or other power modes as desired.
The connecting rod 27 is sleeved with a supporting disk 25 through a universal ball joint bearing 26, a plurality of supporting holes 31 are uniformly formed in the supporting disk 25, and the supporting rod 24 is inserted in the supporting holes 31.
Preferably, the thickness of the supporting disk 25 is 0-30mm greater than that of the universal ball joint bearing. The diameter of the supporting disk 25 is slightly smaller than the aperture, and the gap is controlled to be 0.5 mm-1 mm. The shortest distance between the support hole 31 and the support hole of the support plate 25 and the edge of the support plate is 5-10mm, and the support plate 25 and the support rod 24 are preferably made of nylon or bakelite materials, so that certain support strength can be ensured, and the damage to the inner wall surface can be avoided.
The sander 22, the connector 23, the extension rod 27, the handle 28 and the air compressor 30 are all detachably connected (e.g., screwed or clamped), and can be installed, maintained or repaired as required. And, when polishing different areas, the joint 23 can be installed or not installed according to the needs (the joint 23 is not installed when polishing the outer arc zone 5, the joint 23 needs to be installed when polishing the inner arc dead zone 4, and the polisher 22 is made to be in front).
In the method, a stainless steel bent pipe 1 is placed on a marking platform, and an outer arc area 11 (equivalent to an outer arc section of the bent pipe) and an inner arc blind area 12 (equivalent to an inner arc section of the bent pipe) of an inner hole of the bent pipe are sequentially polished:
wherein, the outer circular arc area is polished by the following steps:
A1) an inner hole sight glass 3 with a universal head is placed at one end of the stainless steel bent pipe 1, and the position of the inner hole sight glass 3 is adjusted until the surface of a workpiece to be polished (namely an outer circular arc area 5 of an inner hole) can be clearly seen;
A2) coarse grinding: extending a bent pipe inner hole grinding tool 2 (see fig. 2) without a joint 23 into the bent pipe section from one end of the inner hole of the stainless steel bent pipe 1, starting a grinding machine 22 to perform rough grinding on the outer arc area 11 of the inner hole, and performing rough grinding to half of the bent pipe section; meanwhile, flaw detection can be carried out by matching with a phased array ultrasonic flaw detector, so that the defects of inner hole folding and wrinkling are completely removed. Meanwhile, the polishing position of the polishing head 12 is adjusted by monitoring the bore sight glass 3, the polishing machine 22 is turned off after coarse grinding is finished, and the elbow bore polishing tool 2 is withdrawn; the grinding head 21 adopts a brown corundum grinding wheel, and can remove wrinkles, oxide skin and burrs on the surface of an inner hole of the bent pipe section.
A3) Fine grinding: replacing the grinding head of the grinding machine 22 of the grinding tool 2 for the inner hole of the bent pipe with a fine grinding head, extending into the bent pipe section again, starting the grinding machine 22 to polish the outer circular arc area 11 of the inner hole to a half of the bent pipe section; meanwhile, the wall thickness of the pipeline is controlled by a wall thickness difference measuring instrument, the polishing position of the polishing device is adjusted by monitoring the inner hole sight glass 3, the polishing machine 22 is turned off after polishing, and the elbow inner hole polishing tool 1 is withdrawn. The grinding head 21 is a hundred-impeller grinding head with the granularity of 80-120, and can be used for finely grinding an inner hole and adjusting the wall thickness of a pipeline.
A4) Polishing: replacing the grinding head of the grinding machine 22 of the grinding tool 2 for the inner hole of the bent pipe with a polishing grinding head, extending into the bent pipe section again, starting the grinding machine 22 to polish the outer circular arc area 11 of the inner hole to a half of the bent pipe section; meanwhile, the polishing position of the polishing device is adjusted by monitoring the inner hole sight glass 3, the polishing machine 22 is turned off after polishing and polishing are finished, and the elbow inner hole polishing tool 1 is withdrawn. The grinding head 21 adopts a 320-granularity abrasive belt, so that the roughness of the ground surface can be improved, and the inner hole can be polished.
The inner arc blind area is polished by the following steps:
B1) coarse grinding: extending a grinding tool 2 for the inner hole of the bent pipe provided with a joint 23 from one end of a hole 1 in the stainless steel bent pipe into the bent pipe section, starting a grinding machine 22 to perform rough grinding on an inner arc blind area 11 of the inner hole, and performing rough grinding to half of the bent pipe section; simultaneously still can cooperate and detect through phased array ultrasonic flaw detector detecting of detecting a flaw, ensure that the hole internal folding and the defect of corrugating are got rid of completely. Meanwhile, the polishing position of the grinding head 21 is adjusted through monitoring of the inner bore sight glass 3, the inclination angle of the polishing machine 22 and the connecting rod 27 is adjusted through a ratchet mechanism on the joint 23, so that the grinding head 21 can completely contact the inner wall of the inner arc blind zone 12 of the inner bore of the elbow, the polishing machine 22 is turned off after coarse polishing is completed, and the elbow inner bore polishing tool 1 is withdrawn; the grinding head 12 is made of a brown corundum grinding wheel, and can remove wrinkles, oxide skin and burrs on the surface of an inner hole of the bent pipe section.
B2) Fine grinding: replacing the grinding head 21 of the grinding machine 22 of the elbow inner hole grinding tool 1 (provided with a joint 23, see fig. 3) with a polishing grinding head, extending into the elbow section from one end of the elbow inner hole of the workpiece, starting the grinding machine 22 to polish the inner arc blind area 11 to a half of the elbow section; controlling the wall thickness of the pipeline by a wall thickness difference measuring instrument, adjusting the polishing position of the polishing device by monitoring an inner hole sight glass, adjusting the inclination angle of the polishing machine 22 and the connecting rod 23 by a ratchet mechanism on the joint 23, enabling the grinding head 21 to be in complete contact with the inner wall of the inner arc blind area 11 of the inner hole of the elbow, turning off the polishing machine 22 after polishing and polishing are finished, and withdrawing the elbow inner hole polishing tool 2; the grinding head 21 is a hundred-impeller grinding head with the granularity of 80-120, so that the roughness of the ground surface can be improved, and the wall thickness of the pipeline can be adjusted.
B3) Polishing: replacing the grinding head 21 of the grinding machine 22 of the elbow inner hole grinding tool 1 (provided with a joint 23, see fig. 3) with a polishing grinding head, extending into the elbow section from one end of the elbow inner hole of the workpiece, starting the grinding machine 22 to polish the inner arc blind area 11 to half of the elbow section; meanwhile, the polishing position of the polishing device is adjusted through monitoring of the inner hole sight glass, the inclination angle of the polishing machine 22 and the connecting rod 23 is adjusted through a ratchet mechanism on the joint 23, so that the polishing head 21 can completely contact the inner wall of the inner arc blind area 11 of the inner hole of the bent pipe, the polishing machine 22 is turned off after polishing and polishing are finished, and the bent pipe inner hole polishing tool 2 is withdrawn; the grinding head 21 adopts a 320-granularity abrasive belt, so that the roughness of the ground surface can be improved, and the inner hole can be polished.
After the steps are completed, the stainless steel elbow 1 is turned, the steps of polishing the outer arc area 11 and polishing the inner arc blind area 12 of the inner hole of the elbow are repeated, and the polishing of the other half of the inner hole of the stainless steel elbow 1 is completed.
The surface quality of the inner hole of the stainless steel elbow pipe machined by the method meets the machining requirement of the Ra3.2 surface, and the method is particularly suitable for the stainless steel elbow pipe with a straight pipe section of more than 2000mm, an elbow pipe inner hole diameter of less than 300mm and a bending angle of less than 120 degrees. The wall thickness can be controlled to be uniform, and the wall thickness difference is ensured to be within 1 mm.
Claims (10)
1. The utility model provides a small-angle minor-caliber stainless steel bent pipe inner bore grinding tool for nuclear power, includes the polisher, its characterized in that still includes the power device who connects gradually with the polisher and connect pole, handle and be used for driving the polisher, connect the pole and go up through universal ball joint bearing cover and be equipped with the supporting disk, evenly open on the supporting disk has a plurality of supported holes, the bracing piece is equipped with in the interpolation of supported hole.
2. The small-angle small-caliber grinding tool for the inner hole of the stainless steel elbow for nuclear power as claimed in claim 1, wherein the thickness of the support disc is 0-30mm greater than that of the universal ball joint bearing.
3. The small-angle small-caliber grinding tool for the inner hole of the stainless steel elbow for nuclear power as claimed in claim 1, wherein the gap between the supporting disc and the pipe wall is controlled to be 0.5 mm-1 mm.
4. The small-angle small-caliber grinding tool for the inner hole of the stainless steel elbow for nuclear power as claimed in claim 1, wherein the grinding machine, the connecting rod, the handle and the power device are detachably connected.
5. The small-angle small-caliber nuclear power stainless steel elbow inner hole grinding tool as claimed in claim 1, wherein the supporting disc and the supporting rod are made of nylon or bakelite.
6. The small-angle small-caliber grinding tool for the inner hole of the stainless steel elbow for nuclear power as claimed in claim 1, wherein the power device is an air compressor, the grinding machine is a pneumatic grinding machine, and a power outlet of the air compressor is communicated with the pneumatic grinding machine through a hollow handle, a connecting rod and the pneumatic grinding machine.
7. The small-angle small-caliber nuclear power stainless steel elbow inner hole grinding tool as claimed in any one of claims 1-6, wherein a joint is further connected between the grinding machine and the connecting rod, and a ratchet mechanism is arranged on the joint.
8. The small-angle small-caliber nuclear power stainless steel elbow inner hole grinding tool as claimed in claim 7, wherein a joint is detachably connected between the grinding machine and the connecting rod.
9. A method for polishing an inner hole of a small-angle small-caliber nuclear power stainless steel bent pipe is characterized by sequentially polishing an outer arc area and an inner arc blind area of an inner hole of the bent pipe:
wherein, the outer circular arc area is polished by the following steps:
A1) putting an inner hole sight glass into one end of the stainless steel bent pipe, and adjusting the position of the inner hole sight glass until the surface of the workpiece to be polished can be clearly seen;
A2) coarse grinding: extending the grinding tool for the inner hole of the bent pipe according to any one of claims 1 to 5 from one end of the inner hole of the stainless steel bent pipe into the bent pipe section, and starting the grinding machine to perform rough grinding on the outer circular arc area of the inner hole to half of the bent pipe section; meanwhile, the polishing position of the grinding head is adjusted through monitoring of an inner hole sight glass, the polishing machine is turned off after coarse grinding is finished, and a bent pipe inner hole polishing tool is withdrawn;
A3) fine grinding: replacing a grinding head of a grinding machine of the grinding tool for the inner hole of the bent pipe with a fine grinding head, stretching into the bent pipe section again, starting the grinding machine to polish the outer circular arc area of the inner hole to a half of the bent pipe section; meanwhile, the polishing position of the polishing device is adjusted through monitoring of an inner bore sight glass, the wall thickness of the pipeline is controlled by using a wall thickness measuring instrument, the polishing machine is turned off after polishing is finished, and a polishing tool of an inner bore of the bent pipe is withdrawn;
A4) polishing: replacing a grinding head of a grinding machine of the grinding tool for the inner hole of the bent pipe with a polishing grinding head, extending into the bent pipe section again, starting the grinding machine to polish the outer circular arc area of the inner hole to a half of the bent pipe section; meanwhile, the polishing position of the polishing device is adjusted through monitoring of the inner hole sight glass, the polishing machine is turned off after polishing and polishing are finished, and a polishing tool of the inner hole of the bent pipe is withdrawn.
The inner arc blind area is polished by the following steps:
B1) coarse grinding: extending the elbow inner hole grinding tool according to claim 7 or 8 into the elbow section from one end of the stainless steel elbow inner hole, starting the grinding machine to perform rough grinding on the inner arc blind area of the inner hole, and performing rough grinding to half of the elbow section; meanwhile, the polishing position of the polishing head is adjusted through monitoring of the inner hole sight glass, the inclination angle of the polishing machine and the connecting rod is adjusted through a ratchet mechanism on the joint, so that the polishing head can completely contact the inner wall of an inner arc blind area of the inner hole of the bent pipe, the polishing machine is turned off after coarse grinding is finished, and a bent pipe inner hole polishing tool is withdrawn;
B2) fine grinding: replacing a grinding head of a grinding machine of the grinding tool for the inner hole of the bent pipe with a fine grinding head, extending one end of the inner hole of the bent pipe of the workpiece into the bent pipe section of the workpiece, starting the grinding machine to polish the inner arc blind area to a half of the bent pipe section; meanwhile, the polishing position of the polishing device is adjusted through monitoring of an inner hole sight glass, the wall thickness of the pipeline is controlled through a wall thickness measuring instrument, the inclination angle of the polishing machine and a connecting rod is adjusted through a ratchet mechanism on a joint, so that a grinding head can completely contact the inner wall of an inner arc blind area of an inner hole of the bent pipe, the polishing machine is turned off after polishing is completed, and a bent pipe inner hole polishing tool is withdrawn;
B3) polishing: replacing a grinding head of a grinding machine of the grinding tool for the inner hole of the bent pipe with a polishing grinding head, extending one end of the inner hole of the bent pipe of the workpiece into the bent pipe section of the workpiece, starting the grinding machine to polish the inner arc blind area until half of the bent pipe section is ground; meanwhile, the polishing position of the polishing device is adjusted through monitoring of the inner hole sight glass, the inclination angle of the polishing machine and the connecting rod is adjusted through a ratchet mechanism on the joint, so that the polishing head can completely contact the inner wall of the inner arc blind area of the inner hole of the bent pipe, the polishing machine is turned off after polishing and polishing are finished, and the bent pipe inner hole polishing tool is withdrawn;
and after the steps are finished, turning the stainless steel elbow, repeating the steps of polishing the outer arc area and polishing the inner arc blind area of the inner hole of the elbow, and finishing the polishing of the other half of the inner hole of the stainless steel elbow.
10. The method for polishing the inner hole of the small-angle small-caliber nuclear power stainless steel bent pipe according to claim 9,
in the external circular arc polishing step, in A2), assembling a brown corundum grinding wheel on a grinding head of the polishing machine; A3) in the middle, a grinding head of the grinding machine is assembled with a hundred-impeller grinding head with the granularity of 80-120; A4) in the middle, a grinding head of the grinding machine is provided with a 320-granularity abrasive belt;
in the step of polishing the inner arc blind area, B1), assembling a brown corundum grinding wheel on a grinding head of the polishing machine; B2) in the middle, a grinding head of the grinding machine is provided with a hundred-impeller grinding head with the granularity of 80-120; B3) in the middle, a grinding head of the grinding machine is provided with a 320-granularity abrasive belt.
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| CN202210635545.4A CN114932466A (en) | 2022-06-06 | 2022-06-06 | Method and tool for polishing inner hole of stainless steel elbow for small-angle small-caliber nuclear power |
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| CN202210635545.4A CN114932466A (en) | 2022-06-06 | 2022-06-06 | Method and tool for polishing inner hole of stainless steel elbow for small-angle small-caliber nuclear power |
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