CN114135576A - Main bearing of heading machine and machining method of main bearing outer ring assembly - Google Patents
Main bearing of heading machine and machining method of main bearing outer ring assembly Download PDFInfo
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- CN114135576A CN114135576A CN202111515649.3A CN202111515649A CN114135576A CN 114135576 A CN114135576 A CN 114135576A CN 202111515649 A CN202111515649 A CN 202111515649A CN 114135576 A CN114135576 A CN 114135576A
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- outer ring
- hole
- pin shaft
- assembly
- roller
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- 238000003754 machining Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 12
- 238000010791 quenching Methods 0.000 claims abstract description 4
- 230000000171 quenching effect Effects 0.000 claims abstract description 4
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000004381 surface treatment Methods 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 3
- 238000005496 tempering Methods 0.000 claims description 3
- 239000006249 magnetic particle Substances 0.000 claims description 2
- 238000003672 processing method Methods 0.000 abstract description 4
- 238000010008 shearing Methods 0.000 abstract description 2
- 230000005641 tunneling Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/50—Other types of ball or roller bearings
- F16C19/505—Other types of ball or roller bearings with the diameter of the rolling elements of one row differing from the diameter of those of another row
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/60—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/64—Special methods of manufacture
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention provides a main bearing of a heading machine, which comprises an outer ring assembly, an inner ring assembly and a roller assembly. The processing method of the main bearing outer ring assembly comprises the following steps: the inner and outer surfaces of the first outer ring and the second outer ring are processed, and then quenching areas of the first outer ring and the second outer ring are quenched; processing a threaded hole in the first outer ring and a third mounting hole in the second outer ring; the threaded hole of the first outer ring and the third mounting hole of the second outer ring are connected with each other through a bolt, and then a pin shaft hole is machined; and after the first outer ring and the second outer ring are accurately positioned and connected through the pin shaft, a first mounting hole and a second mounting hole are processed. According to the invention, the outer ring assembly is processed through the steps, so that the occurrence of step shearing of the main driving connecting bolt between the contact surfaces of the first mounting hole and the second mounting hole during the assembly of the outer ring assembly is avoided, the perpendicularity and the processing precision between the first mounting hole and the second mounting hole are effectively ensured, and the assembly precision during the repeated disassembly and assembly of the main bearing of the heading machine is ensured.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a main bearing of a heading machine and a machining method of an outer ring assembly of the main bearing.
Background
In the heading machine, the main bearing is used as the heart of the full-face tunnel heading machine and bears the main load in the operation process of the heading machine. The main drive of the heading machine is arranged on a shield body of the heading machine, the main bearing is arranged in the middle of the main drive, and the outer ring of the main bearing and the main drive are firmly fixed by a connecting bolt which passes through a connecting through hole of the main bearing between the main drive and the main bearing; the weight of silt in the cutter head and the tunneling process of the shield tunneling machine is transmitted to the inner ring of the main bearing through the main driving flange, and the roller assembly bears the running load of the tunneling machine, so that the machining precision of the connecting through hole in the main bearing has great significance on the connecting bolt of the main drive and the performance of the main drive.
At present, the assembly method of the mounting through hole on the main bearing adopts split processing, and the method can easily cause that the connecting through hole can not ensure the coaxiality of the outer ring of the main bearing when the outer ring is assembled due to the positioning error of a machine tool, the abrasion of a cutter and the like, so that the perpendicularity of the outer ring connecting through hole is deviated when the outer ring is assembled due to the step. However, when the heading machine is heading under a severe working condition, the connecting through holes cannot guarantee that the coaxiality of the connecting through holes can shear the main driving connecting bolt during the assembly of the outer ring, the stress working condition of the main driving connecting bolt is deteriorated, and the risk that the main driving connecting bolt is cut off by the assembling steps between the mounting holes exists.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a main bearing of a heading machine and a processing method of an outer ring assembly of the main bearing, aiming at ensuring the verticality among mounting holes of an outer ring of the main bearing, improving the processing efficiency of the mounting holes and avoiding the occurrence of step shearing of connecting bolts among the mounting holes during assembly.
In order to achieve the aim, the invention provides a main bearing of a heading machine, which comprises an outer ring assembly, an inner ring assembly and a roller assembly; the outer ring assembly comprises a first outer ring and a second outer ring which are arranged in parallel along the same central axis; the first outer ring is provided with a first connecting hole, a first mounting hole, a threaded hole and a first pin shaft hole, and the first connecting hole is arranged in a penetrating manner along the central axis of the first outer ring; the first mounting hole, the threaded hole and the first pin shaft hole are all provided with a plurality of first mounting holes distributed along the central axis of the first outer ring; the second outer ring is provided with a second connecting hole, a second mounting hole, a third mounting hole and a second pin shaft hole, and the second connecting hole is arranged in a penetrating manner along the central axis of the second outer ring; the second mounting hole, the third mounting hole and the second pin shaft hole are all provided with a plurality of pins distributed along the central axis of the second outer ring and are respectively arranged in one-to-one correspondence with the first mounting hole, the threaded hole and the first pin shaft hole; the first connecting hole and the second connecting hole form a mounting cavity for mounting a roller assembly and an inner ring, and the roller assembly is arranged between the outer ring assembly and the inner ring.
Optionally, the first pin shaft hole and the second pin shaft hole are both provided with a conical structure.
Optionally, the shape of the contact part of the inner wall surface of the first connection hole and the inner ring and the shape of the contact part of the inner wall surface of the second connection hole and the inner ring are matched.
Optionally, the roller assembly includes a main pushing roller, an auxiliary pushing roller and a radial roller, and an outer surface of the main pushing roller is simultaneously in contact with an inner wall of the first outer ring and an outer wall of the inner ring; the outer surface of the auxiliary pushing roller is simultaneously in contact with the inner wall of the second outer ring and the outer wall of the inner ring; the outer surface of the radial roller is simultaneously in contact with the inner wall of the first outer ring and the outer wall of the inner ring, and one end surface of the radial roller is aligned with the contact surfaces of the first outer ring and the second outer ring; the central axes of the main pushing roller and the auxiliary pushing roller are arranged in parallel, and the central axis of the radial roller is perpendicular to the central axis of the main pushing roller.
The invention also provides a processing method of the main bearing outer ring assembly, which comprises the following steps:
1) processing the outer surface of the first outer ring, the outer surface of the second outer ring, the first connecting hole and the second connecting hole respectively;
2) respectively processing a first connecting hole threaded hole of the first outer ring and a second connecting hole through hole of the second outer ring;
3) connecting the threaded hole and the third mounting hole with each other by using a connecting bolt;
4) processing a first pin shaft hole of the first outer ring and a second pin shaft hole of the second outer ring;
5) connecting the first pin shaft hole and the second pin shaft hole with each other by using a pin shaft;
6) and processing a first mounting hole of the first outer ring and a second mounting hole of the second outer ring.
Optionally, the outer surface of the first outer ring and the outer surface of the second outer ring are machined in a rough machining mode, a surface treatment mode and a finish machining mode.
Optionally, the surface treatment includes quenching, tempering and magnetic particle inspection of the contact part of the first outer ring and the roller assembly and the contact part of the second outer ring and the roller assembly.
Optionally, when the first connecting hole and the second connecting hole are machined, a mode of machining from one end of the first outer ring to the direction of the second outer ring is adopted.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the main bearing of the heading machine, the outer ring assembly is of a combined structure of the first outer ring and the second outer ring, so that the main bearing is convenient to assemble (the first outer ring, the main push roller assembly, the inner ring, the radial roller assembly and the auxiliary push roller assembly are assembled first, and then the second outer ring is assembled, so that the installation difficulty is reduced).
(2) According to the processing method of the main bearing outer ring assembly, after other parts (the outer surface, the inner surface, the threaded hole and the third mounting hole) of the outer ring are processed, the first outer ring and the second outer ring are mutually locked and connected through the connecting bolt, and then the first pin shaft hole and the second pin shaft hole are processed, so that the first pin shaft hole and the second pin shaft hole can be effectively guaranteed to be on the same axis when being repeatedly disassembled and assembled; the first outer ring and the second outer ring are accurately positioned and connected through the pin shaft, and then the first mounting hole and the second mounting hole are machined, so that the first mounting hole and the second mounting hole can be effectively guaranteed to be on the same axis when the first mounting hole and the second mounting hole are repeatedly disassembled and assembled; the occurrence that the main driving connecting bolt is sheared by a step between the contact surfaces of the first mounting hole and the second mounting hole when the outer ring assembly is assembled is avoided, the verticality and the machining precision between the first mounting hole and the second mounting hole are effectively guaranteed, the stress working condition of the main driving connecting bolt is improved, the working performance of the main driving of the tunneling machine is improved, and the assembling precision of the main bearing of the tunneling machine during repeated disassembly and assembly is guaranteed.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic cross-sectional view of a main bearing of a heading machine along a first mounting hole and a second mounting hole to a central axis according to an embodiment of the invention;
FIG. 2 is a schematic cross-sectional view of a main bearing of the heading machine along a threaded hole and a third mounting hole to a central axis according to an embodiment of the invention;
figure 3 is a schematic cross-sectional view of a main bearing of the heading machine along a first pin shaft hole, a second pin shaft hole and a central axis in an embodiment of the invention.
Wherein:
1. the outer lane subassembly, 1.1, first outer lane, 1.1.1, first mounting hole, 1.1.2, screw hole, 1.1.3, first round pin shaft hole, 1.2, second outer lane, 1.2.1, second mounting hole, 1.2.2, third mounting hole, 1.2.3, second round pin shaft hole, 2, inner circle, 3, roller subassembly, 3.1, mainly push away the roller, 3.2, assist and push away the roller, 3.3, radial roller.
Detailed Description
In order to make the aforementioned objects, features, advantages, and the like of the present invention more clearly understandable, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the drawings of the present invention are simplified and are not to precise scale, and are provided for convenience and clarity in assisting the description of the embodiments of the present invention; the several references in this disclosure are not limited to the particular numbers in the examples of the figures; the directions or positional relationships indicated by ' front ' middle, ' rear ' left ', right ', upper ', lower ', top ', bottom ', middle ', etc. in the present invention are based on the directions or positional relationships shown in the drawings of the present invention, and do not indicate or imply that the devices or components referred to must have a specific direction, nor should be construed as limiting the present invention.
Example (b):
referring to fig. 1 to 3, the main bearing of the heading machine provided by the invention comprises an outer ring assembly 1, an inner ring 2 and a roller assembly 3;
the outer ring assembly 1 comprises a first outer ring 1.1 and a second outer ring 1.2 which are arranged up and down, a first connecting hole, a first mounting hole 1.1.1, a threaded hole 1.1.2 and a first pin shaft hole 1.1.3 are arranged on the first outer ring 1.1, a second connecting hole, a second mounting hole 1.2.1, a third mounting hole 1.2.2 and a second pin shaft hole 1.2.3 are arranged on the second outer ring 1.2, the first connecting hole penetrates through the central axis of the first outer ring 1.1, the second connecting hole penetrates through the central axis of the second outer ring 1.2, and the first mounting hole 1.1.1, the threaded hole 1.1.2 and the first pin shaft hole 1.1.3 are all provided with a plurality of connecting holes distributed along the central axis of the first outer ring 1.1 and are all located outside the first connecting hole; the second mounting hole 1.2.1, the third mounting hole 1.2.2 and the second pin shaft hole 1.2.3 are all provided with a plurality of pins distributed along the central axis of the second outer ring 1.2 and are all positioned outside the second connecting hole; the plurality of first mounting holes 1.1.1 and the plurality of second mounting holes 1.2.1 are arranged in a one-to-one correspondence manner, the plurality of threaded holes 1.1.2 and the plurality of third mounting holes 1.2.2 are arranged in a one-to-one correspondence manner, the plurality of first pin hole holes 1.1.3 and the plurality of second pin hole holes 1.2.3 are arranged in a one-to-one correspondence manner, the plurality of first mounting holes 1.1.1 and the plurality of second mounting holes 1.2.1 are used for being connected with the heading machine, the plurality of threaded holes 1.1.2 and the plurality of third mounting holes 1.2.2 are connected with each other through a plurality of connecting bolts, and the plurality of first pin hole holes 1.1.3 and the plurality of second pin hole holes 1.2.3 are connected with each other through a plurality of pin shafts;
the inner ring 2 is arranged in the first connecting hole and the second connecting hole, and a roller assembly 3 is further arranged between the outer wall of the inner ring 2 and the inner walls of the first connecting hole and the second connecting hole.
Preferably, the roller assembly 3 includes a main push roller 3.1, an auxiliary push roller 3.2 and a radial roller 3.3, the main push roller 3.1 is arranged between the first outer ring 1.1 and the inner ring 2, the auxiliary push roller 3.2 is arranged between the second outer ring 1.2 and the inner ring 2, the radial roller 3.3 is arranged between the inner ring 2 and the first outer ring 1.1, and one end of the radial roller is in contact with the end surface of the second outer ring 1.2, and the central axis of the radial roller 3.3 is perpendicular to the central axis of the main push roller 3.1 and the central axis of the auxiliary push roller 3.2.
Preferably, the first pin shaft hole 1.1.3 and the second pin shaft hole 1.2.3 are both provided with a conical structure.
Preferably, the cross sections of the first connecting hole and the second connecting hole are consistent with the cross section of the mutual matching part of the inner ring 2.
A machining method of a main bearing outer ring assembly comprises the following specific steps:
1) respectively roughly machining the inner and outer surfaces (the inner and outer surfaces comprise the outer surface of the first outer ring, the outer surface of the second outer ring, the first connecting hole and the second connecting hole) of the first outer ring and the second outer ring;
2) respectively carrying out quenching treatment, tempering treatment and magnetic powder inspection treatment on the part of the first outer ring in contact with the roller assembly and the part of the second outer ring in contact with the roller assembly in sequence;
3) finish machining is respectively carried out on the inner surface and the outer surface of the first outer ring and the second outer ring, and the contact surfaces of the first outer ring and the second outer ring can be completely and tightly attached;
4) respectively processing a threaded hole of the first outer ring and a third mounting hole of the second outer ring, and processing bottom holes of a first pin shaft hole of the first outer ring and a second pin shaft hole of the second outer ring;
5) the threaded hole and the third mounting hole are connected through a connecting bolt to realize the connection of the first outer ring and the second outer ring to form an outer ring assembly, and the outer ring assembly is placed on processing equipment to carry out finish machining on the first pin shaft hole and the second pin shaft hole so as to ensure the coaxiality and the accuracy consistency of the first pin shaft hole and the second pin shaft hole; meanwhile, other parts (such as threaded holes and the like) can be processed one by one according to the structure of the outer ring assembly;
6) the first mounting hole and the second mounting hole are processed after the first pin shaft hole and the second pin shaft hole are connected through the pin shaft, so that the coaxiality and the accuracy consistency of the first mounting hole and the second mounting hole are ensured;
7) and (4) removing the pin shaft and the connecting bolt, and respectively carrying out deburring treatment on the first outer ring and the second outer ring.
Preferably, when the first mounting hole and the second mounting hole are drilled, the hole is drilled from one end of the first outer ring to the direction of the second outer ring, so as to prevent the mutual deviation of the first outer ring and the second outer ring (because the connecting bolt and the pin shaft are both connected from the direction of the second outer ring to the first outer ring, when the first mounting hole and the second mounting hole are drilled, the hole is drilled from one end of the first outer ring to the direction of the second outer ring, which is beneficial to the relative stability between the first outer ring and the second outer ring).
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A main bearing of a heading machine is characterized by comprising an outer ring assembly, an inner ring assembly and a roller assembly;
the outer ring assembly comprises a first outer ring and a second outer ring which are arranged in parallel along the same central axis; the first outer ring is provided with a first connecting hole, a first mounting hole, a threaded hole and a first pin shaft hole, and the first connecting hole is arranged in a penetrating manner along the central axis of the first outer ring; the first mounting hole, the threaded hole and the first pin shaft hole are all provided with a plurality of first mounting holes distributed along the central axis of the first outer ring; the second outer ring is provided with a second connecting hole, a second mounting hole, a third mounting hole and a second pin shaft hole, and the second connecting hole is arranged in a penetrating manner along the central axis of the second outer ring; the second mounting hole, the third mounting hole and the second pin shaft hole are all provided with a plurality of pins distributed along the central axis of the second outer ring and are respectively arranged in one-to-one correspondence with the first mounting hole, the threaded hole and the first pin shaft hole;
the first connecting hole and the second connecting hole form a mounting cavity for mounting a roller assembly and an inner ring, and the roller assembly is arranged between the outer ring assembly and the inner ring.
2. The main bearing of claim 1, wherein the first and second pin shaft bores are each provided as a tapered configuration.
3. The main bearing of the boring machine according to claim 2, wherein a contact portion where the inner wall surface of the first connecting hole contacts the inner ring and a contact portion where the inner wall surface of the second connecting hole contacts the inner ring match the shape of a contact surface of the inner ring.
4. The main bearing of the heading machine of claim 3, wherein the roller assembly comprises a main thrust roller, an auxiliary thrust roller and a radial roller, wherein the outer surface of the main thrust roller is simultaneously in contact with the inner wall of the first outer ring and the outer wall of the inner ring; the outer surface of the auxiliary pushing roller is simultaneously in contact with the inner wall of the second outer ring and the outer wall of the inner ring; the outer surface of the radial roller is simultaneously in contact with the inner wall of the first outer ring and the outer wall of the inner ring, and one end face of the radial roller is in contact with the end face of the second outer ring;
the central axes of the main pushing roller and the auxiliary pushing roller are arranged in parallel, and the central axis of the radial roller is perpendicular to the central axis of the main pushing roller.
5. A machining method of the main bearing outer ring assembly is characterized by comprising the following steps:
1) processing the outer surface of the first outer ring, the outer surface of the second outer ring, the first connecting hole and the second connecting hole respectively;
2) respectively processing a first connecting hole threaded hole of the first outer ring and a second connecting hole through hole of the second outer ring;
3) connecting the threaded hole and the third mounting hole with each other by using a connecting bolt;
4) processing a first pin shaft hole of the first outer ring and a second pin shaft hole of the second outer ring;
5) connecting the first pin shaft hole and the second pin shaft hole with each other by using a pin shaft;
6) and processing a first mounting hole of the first outer ring and a second mounting hole of the second outer ring.
6. The method of assembling of claim 5, wherein the outer surface of the first outer ring and the outer surface of the second outer ring are machined by rough machining, surface treatment, and finish machining.
7. The assembling method according to claim 6, wherein the surface treatment includes quenching treatment, tempering treatment and magnetic particle inspection treatment of a portion where the first outer ring is in contact with the roller assembly and a portion where the second outer ring is in contact with the roller assembly.
8. The assembling method according to claim 6, wherein the first and second mounting holes are machined in a direction from one end of the first outer ring toward the second outer ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111515649.3A CN114135576B (en) | 2021-12-13 | 2021-12-13 | Main bearing of heading machine and processing method of main bearing outer ring assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111515649.3A CN114135576B (en) | 2021-12-13 | 2021-12-13 | Main bearing of heading machine and processing method of main bearing outer ring assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114135576A true CN114135576A (en) | 2022-03-04 |
| CN114135576B CN114135576B (en) | 2023-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111515649.3A Active CN114135576B (en) | 2021-12-13 | 2021-12-13 | Main bearing of heading machine and processing method of main bearing outer ring assembly |
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| CN (1) | CN114135576B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962459A (en) * | 2022-06-30 | 2022-08-30 | 中国铁建股份有限公司 | Tunneling machine main bearing and matching processing method of outer ring raceway surface and thin-wall ring piece of tunneling machine main bearing |
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Cited By (2)
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| CN114962459A (en) * | 2022-06-30 | 2022-08-30 | 中国铁建股份有限公司 | Tunneling machine main bearing and matching processing method of outer ring raceway surface and thin-wall ring piece of tunneling machine main bearing |
| CN114962459B (en) * | 2022-06-30 | 2023-12-15 | 中国铁建股份有限公司 | Main bearing of heading machine and matching processing method of outer ring raceway surface of main bearing of heading machine and thin-wall ring piece |
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