CN116638258A - Internal thread repairing process for normal-pressure tool changing tool cylinder mounting seat of oversized-diameter shield cutterhead - Google Patents
Internal thread repairing process for normal-pressure tool changing tool cylinder mounting seat of oversized-diameter shield cutterhead Download PDFInfo
- Publication number
- CN116638258A CN116638258A CN202310333417.9A CN202310333417A CN116638258A CN 116638258 A CN116638258 A CN 116638258A CN 202310333417 A CN202310333417 A CN 202310333417A CN 116638258 A CN116638258 A CN 116638258A
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- Prior art keywords
- thread
- reaming
- thread sleeve
- screw hole
- sleeve
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010276 construction Methods 0.000 claims abstract description 16
- 238000005498 polishing Methods 0.000 claims abstract description 8
- 238000010079 rubber tapping Methods 0.000 claims abstract description 8
- 238000003754 machining Methods 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims description 20
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- VNTLIPZTSJSULJ-UHFFFAOYSA-N chromium molybdenum Chemical compound [Cr].[Mo] VNTLIPZTSJSULJ-UHFFFAOYSA-N 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 208000032544 Cicatrix Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000010730 cutting oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 231100000241 scar Toxicity 0.000 description 1
- 230000037387 scars Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012207 thread-locking agent Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Ceramic Products (AREA)
Abstract
The invention relates to an internal thread repairing process for an ultra-large diameter shield cutterhead normal-pressure tool changing tool cylinder mounting seat, which comprises the following steps: machining the damaged screw hole to form a reaming hole, and tapping the reaming hole by adopting a screw tap; screwing the thread sleeve into the reaming by adopting a special tool; the reaming is welded with the outer surface of the thread bush; polishing to enable the end part of the thread sleeve to be flush with the tool apron frame. The beneficial effects of the invention are as follows: the thread sleeve is pre-machined through a numerical control machine tool and only needs to be screwed into the reaming, so that the influence of external factors is small, the downtime of the shield machine is greatly reduced, and the construction period is saved; because the internal thread of the thread sleeve is the same as the original thread of the damaged screw hole in size, the effect of replacing the damaged screw hole is achieved, and the matching use of the original components of the tool apron is ensured.
Description
Technical Field
The invention belongs to the technical field of shield construction, and particularly relates to an internal thread repairing process for a normal-pressure tool changing tool cylinder mounting seat of a super-large-diameter shield cutterhead.
Background
In the construction process of modern urban subways and highway tunnels, a shield construction method is commonly used. The shield construction method has the advantages of small disturbance to the bottom layer, high construction speed, high mechanization degree and the like, but for certain special engineering conditions, because the soil layer condition is complex, abnormal abrasion is easily caused to the shield cutter, frequent replacement of the cutter is required, the conditions of cutter seat thread slipping and the like are easily caused, and the operation of the shield machine is influenced.
At present, for the problem of screw hole slipping of a shield cutter holder, an overall replacement scheme is generally adopted, the overall replacement price is higher, the overall cost control of projects is affected, the purchasing and mounting processes are longer, and the influence on the construction period is larger.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an internal thread repairing process for an installation seat of a normal-pressure tool changing tool cylinder of a super-large-diameter shield cutterhead.
The process for repairing the internal threads of the normal-pressure tool changing tool cylinder mounting seat of the oversized-diameter shield cutterhead comprises a tool apron frame and a thread sleeve, wherein the tool apron frame is provided with original screw holes of a tool apron in a circumferential direction, and the original screw holes of the tool apron comprise damaged screw holes;
the thread bush is hollow, the outer surface of the thread bush is provided with thread bush external threads, and the inner surface of the thread bush is provided with thread bush internal threads; a reaming is arranged at the damaged screw hole, and threads matched with the external threads of the thread sleeve are arranged in the reaming; the thread sleeve is arranged in the reaming through the external thread of the thread sleeve, and the internal thread of the thread sleeve is the same as the thread of the original screw hole of the tool apron;
there are also special tools for screwing the threaded sleeve into the counterbore.
As preferable: the special tool comprises a bolt and an auxiliary nut, wherein the bolt is matched with the internal threads of the threaded sleeve, and the auxiliary nut is fixed on the threaded section of the bolt; when the thread sleeve is screwed into the reaming, the front end of the bolt stretches into the thread sleeve, and the end part of the thread sleeve is abutted against the auxiliary nut.
As preferable: the reaming inlet end of the damaged screw hole is provided with a bevel, and the angle of the bevel is 40-60 degrees; and the reaming is welded with the thread sleeve at the groove.
As preferable: the end of the thread sleeve is flush with the tool apron frame.
As preferable: the range of the reaming includes the damaged screw hole, and the reaming is the same as the shaft of the damaged screw hole, and the reaming size is larger than the size of the damaged screw hole.
The construction method of the ultra-large diameter shield cutterhead normal pressure tool changing barrel mounting seat internal thread repairing process comprises the following steps:
step one, reaming construction: machining the damaged screw hole to form a reaming, tapping the reaming by adopting a screw tap, and machining a groove at the reaming inlet;
step two, installing a threaded sleeve: screwing the thread sleeve into the reaming by adopting a special tool, screwing the front end of the bolt into the thread sleeve until the end part of the thread sleeve is abutted against the auxiliary nut, and screwing the thread sleeve into the reaming by the bolt;
step three, welding and reinforcing: welding at the groove, and welding and connecting the reaming with the outer surface of the thread sleeve;
step four, polishing: and polishing the part of the threaded sleeve, which is higher than the tool apron frame, so that the end part of the threaded sleeve is flush with the tool apron frame.
Preferably, before the thread bush is installed, thread glue is smeared at the front end of the thread bush; and after the thread sleeve is screwed into the reaming, tapping correction is carried out on the internal thread of the thread sleeve through the tap.
The beneficial effects of the invention are as follows:
1) Compared with the whole replacement of the tool apron frame, the tool apron internal thread repairing method has low material and labor cost and better economic benefit.
2) The method for repairing the internal thread of the tool apron has short construction time, the thread sleeve is pre-machined by a numerical control machine tool and only needs to be screwed into the reaming, the influence of external factors is small, the downtime of the shield machine is greatly reduced, and the construction period is saved.
3) After the damaged screw hole of the tool apron is repaired, the internal thread of the thread sleeve is the same as the original thread size of the damaged screw hole, so that the damaged screw hole is replaced, and the matching use of original components of the tool apron is ensured.
Drawings
FIG. 1 is a view of a shield cutter holder;
FIG. 2 is a thread bushing;
FIG. 3 is a schematic view of the internal and external threads of a threaded sleeve;
fig. 4 is a schematic view of a threaded sleeve installation.
Reference numerals illustrate: the tool apron comprises a tool apron frame 1, an original screw hole 2 of the tool apron, a thread bush 3, a thread bush external thread 31, a thread bush internal thread 32, a bolt 4 and an auxiliary nut 5.
Detailed Description
The invention is further described below with reference to examples. The following examples are presented only to aid in the understanding of the invention. It should be noted that it will be apparent to those skilled in the art that modifications can be made to the present invention without departing from the principles of the invention, and such modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Example 1
As an embodiment, as shown in fig. 1 to 4, the process for repairing the internal threads of the normal-pressure tool changing cylinder mounting seat of the oversized-diameter shield cutterhead comprises a tool apron frame 1 and a thread sleeve 3, wherein the tool apron frame 1 is provided with original screw holes 2 of a tool apron in a circumferential direction, and the original screw holes 2 of the tool apron comprise damaged screw holes;
as shown in fig. 2 and 3, the thread bush 3 is hollow, the outer surface of the thread bush 3 is provided with thread bush external threads 31, and the inner surface of the thread bush 3 is provided with thread bush internal threads 32.
The damaged screw hole is processed to form a reaming, the reaming range comprises the damaged screw hole, the reaming is the same as the shaft of the damaged screw hole, the reaming size is larger than the damaged screw hole, and threads matched with the external threads 31 of the thread sleeve are arranged in the reaming. The reaming inlet end of the damaged screw hole is provided with a bevel, and the angle of the bevel is 40-60 degrees.
The thread bush 3 is arranged in the reaming through the thread bush external thread 31, the reaming is in welded connection with the thread bush 3 at the groove, and the end part of the thread bush 3 is flush with the tool apron frame 1.
The internal thread 32 of the thread sleeve is the same as the thread of the original screw hole 2 of the tool apron; the thread sleeve 3 can completely replace the original damaged screw hole after being screwed into the reaming.
As shown in fig. 4, there is also a special tooling for screwing the threaded sleeve 3 into the counterbore. The special tool comprises a bolt 4 and an auxiliary nut 5, wherein the bolt 4 is matched with the internal threads 32 of the thread bush, and the auxiliary nut 5 is fixed on the thread section of the bolt 4; when the thread bush 3 is screwed into the reaming, the front end of the bolt 4 stretches into the thread bush 3, the end part of the thread bush 3 is abutted against the auxiliary nut 5, the auxiliary nut 5 plays a limiting role, and at the moment, the bolt 4 can be rotated to enable the thread bush 3 to synchronously rotate and be screwed into the reaming.
Example two
As another embodiment, the construction method of the internal thread repairing process of the normal-pressure tool changing tool holder mounting seat of the oversized-diameter shield cutterhead in the first embodiment comprises the following steps:
step one, reaming construction: firstly, installing a magnetic drill at a position corresponding to a damaged screw hole, in order to ensure the safety of constructors, a power socket used by the magnetic drill must be matched with a power plug of the magnetic drill, a leakage protector must be installed at the power supply leading-in side, the magnetic drill is safely adsorbed on a workpiece, the installation position of the magnetic drill is finely adjusted, the concentricity of the axis of the magnetic drill and the damaged screw hole is ensured to be less than or equal to 0.2mm, the verticality is ensured to be less than or equal to 0.2mm, then the damaged screw hole is cleaned, and the parameters of the damaged screw hole in the embodiment are thatThe damaged screw hole is expanded to +.>Forming a reaming, wherein cutting oil must be used in the drilling process, and an aqueous solution must not be used in order to ensure the drilling quality; after reaming, tapping the reaming by adopting a screw tap to form M36 x 2 threads, and inserting a nose cone in the tapping process of the screw tap to enable the center line of the screw tap to be consistent with the center line of a drilled hole. The two hands uniformly rotate and slightly press to feed the tap, so that the tap does not need to be pressed after feeding; reversing about 45 ° to sever the chip once per tap rotation to avoid clogging; in order to facilitate subsequent welding operation, a mechanical method is adopted to process a groove at the reaming inlet, and the groove angle is 40-60 degrees.
Step two, installing a threaded sleeve: adopting a high-strength chromium-molybdenum steel hot rolled bar or a forged blank to prefabricate a thread bush 3, wherein the hardness of the thread bush 3 is HRC42-45 after quenching-tempering-normalizing heat treatment, the parameters of the external thread 31 of the thread bush 3 special for numerical control machine tool processing are M36 x 2mm, and the internal thread 32 of the thread bush is M30 x 3.5mm; thoroughly cleaning the internal threaded hole with the reamed and tapped holes and the standby thread bush before installing the thread bush 3, removing residues and oil stains, and smearing the Altai 234 thread adhesive at the front end of the thread bush in advance before installing the thread bush; screwing the thread sleeve 3 into the reaming by adopting a special tool, screwing the front end of the bolt 4 into the thread sleeve 3 until the end part of the thread sleeve 3 is abutted against the auxiliary nut 5, and screwing the thread sleeve 3 into the reaming by the bolt 4, wherein the moment is 320N/M; after the sleeve 3 is screwed into the reamer, the internal thread 32 of the sleeve is tapped by a tap.
Step three, welding and reinforcing: welding at the groove, and welding and connecting the reaming with the outer surface of the thread sleeve 3; the outer part and the groove of the threaded sleeve 3 are welded by adopting a chromium-molybdenum steel welding wire TIG, the welding piece is preheated for 3-5 seconds at the beginning part of the welding piece after arc ignition, and the wire feeding is started after a molten pool is formed; during welding, the welding gun angle of the welding wire is proper, the welding wire is fed uniformly, the full welding seam is ensured, threads inside the threaded sleeve cannot be damaged, the dye penetration flaw detection is ensured on the welding seam, and the flaw detection area and the stain chemical substances such as oxide skin, greasy dirt and the like on the upper adjacent area within the range of 25mm, which affect the penetration agent, are thoroughly cleaned, so that the flaw detection effect is ensured.
Step four, polishing: after the welding quality is detected to be qualified, manually polishing the part of the threaded sleeve 3, which is higher than the tool apron frame 1, wherein the surface can be polished by adopting an angle grinder and selecting a rough grinding wheel surface to polish the surface without scars, and then polishing the detail by using a louver; the flatness is ensured to be less than or equal to 0.05mm, the roughness is ensured to be less than or equal to Ra1.6, and the quality of threads is ensured to enable the end part of the thread sleeve 3 to be flush with the tool apron frame 1; and finally, tapping and trimming the repaired internal threaded hole by adopting the tap of M30.
If the original screw hole 2 of the tool holder is of other sizes, the size of the external screw thread 31 of the screw sleeve can be determined by self under the condition of ensuring the strength of the screw sleeve 3, and the size of the internal screw thread 32 of the screw sleeve is matched with the original screw hole 2 of the tool holder.
Claims (7)
1. The process for repairing the internal threads of the mounting seat of the normal-pressure tool changing cylinder of the oversized-diameter shield cutterhead is characterized by comprising the following steps of: the tool apron comprises a tool apron frame (1) and a thread sleeve (3), wherein the tool apron frame (1) is provided with an original screw hole (2) of the tool apron in a circumferential direction, and the original screw hole (2) of the tool apron comprises a damaged screw hole;
the thread sleeve (3) is hollow, the outer surface of the thread sleeve (3) is provided with thread sleeve external threads (31), and the inner surface of the thread sleeve (3) is provided with thread sleeve internal threads (32); a reaming is arranged at the damaged screw hole, and threads matched with the external threads (31) of the thread sleeve are arranged in the reaming; the thread sleeve (3) is arranged in the reaming through a thread sleeve external thread (31), and a thread sleeve internal thread (32) is the same as the thread of the original screw hole (2) of the tool apron;
there is also a special tooling for screwing the threaded sleeve (3) into the counterbore.
2. The process for repairing the internal threads of the mounting seat of the normal-pressure tool changing cylinder of the oversized-diameter shield cutter head, disclosed by claim 1, is characterized in that: the special tool comprises a bolt (4) and an auxiliary nut (5), wherein the bolt (4) is matched with an internal thread (32) of a thread sleeve, and the auxiliary nut (5) is fixed on a thread section of the bolt (4); when the thread sleeve (3) is screwed into the reaming, the front end of the bolt (4) stretches into the thread sleeve (3), and the end part of the thread sleeve (3) is abutted against the auxiliary nut (5).
3. The process for repairing the internal threads of the mounting seat of the normal-pressure tool changing cylinder of the oversized-diameter shield cutter head, disclosed by claim 1, is characterized in that: the reaming inlet end of the damaged screw hole is provided with a bevel, and the angle of the bevel is 40-60 degrees; the reaming is welded with the thread sleeve (3) at the groove.
4. The process for repairing the internal threads of the mounting seat of the normal-pressure tool changing cylinder of the oversized-diameter shield cutter head, disclosed by claim 1, is characterized in that: the end of the thread sleeve (3) is flush with the tool apron frame (1).
5. The process for repairing the internal threads of the mounting seat of the normal-pressure tool changing cylinder of the oversized-diameter shield cutter head, disclosed by claim 1, is characterized in that: the range of the reaming includes the damaged screw hole, and the reaming is the same as the shaft of the damaged screw hole, and the reaming size is larger than the size of the damaged screw hole.
6. The construction method of the ultra-large diameter shield cutter head normal pressure tool changing tool cylinder mounting seat internal thread repairing process according to any one of claims 1 to 5, which is characterized by comprising the following steps:
step one, reaming construction: machining the damaged screw hole to form a reaming, tapping the reaming by adopting a screw tap, and machining a groove at the reaming inlet;
step two, installing a threaded sleeve: screwing the thread sleeve (3) into the reaming by adopting a special tool, screwing the front end of the bolt (4) into the thread sleeve (3) until the end part of the thread sleeve (3) is abutted against the bolt (4), and screwing the thread sleeve (3) into the reaming by the bolt (4);
step three, welding and reinforcing: welding at the groove, and welding and connecting the reaming with the outer surface of the thread sleeve (3);
step four, polishing: and polishing the part of the threaded sleeve (3) higher than the tool apron frame (1) to enable the end part of the threaded sleeve (3) to be flush with the tool apron frame (1).
7. The construction method of the ultra-large diameter shield cutterhead normal pressure tool changing tool cylinder mounting seat internal thread repairing process according to claim 5 is characterized in that before the thread bush (3) is mounted, thread glue is smeared at the front end of the thread bush (3); after the thread sleeve (3) is screwed into the reaming, tapping correction is carried out on the internal thread (32) of the thread sleeve through a tap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310333417.9A CN116638258A (en) | 2023-03-31 | 2023-03-31 | Internal thread repairing process for normal-pressure tool changing tool cylinder mounting seat of oversized-diameter shield cutterhead |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310333417.9A CN116638258A (en) | 2023-03-31 | 2023-03-31 | Internal thread repairing process for normal-pressure tool changing tool cylinder mounting seat of oversized-diameter shield cutterhead |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116638258A true CN116638258A (en) | 2023-08-25 |
Family
ID=87623579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310333417.9A Pending CN116638258A (en) | 2023-03-31 | 2023-03-31 | Internal thread repairing process for normal-pressure tool changing tool cylinder mounting seat of oversized-diameter shield cutterhead |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116638258A (en) |
-
2023
- 2023-03-31 CN CN202310333417.9A patent/CN116638258A/en active Pending
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