CN112355567A - Method for repairing cracks of bogie of metallurgical railway diesel locomotive - Google Patents
Method for repairing cracks of bogie of metallurgical railway diesel locomotive Download PDFInfo
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- CN112355567A CN112355567A CN202011253709.4A CN202011253709A CN112355567A CN 112355567 A CN112355567 A CN 112355567A CN 202011253709 A CN202011253709 A CN 202011253709A CN 112355567 A CN112355567 A CN 112355567A
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- 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
- B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
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Abstract
The invention discloses a method for repairing cracks of a bogie of a metallurgical railway diesel locomotive, which comprises the following steps: A. under the condition of not dismantling the bogie frame, removing the paint surface and oil stains near the cracks of the frame body, and exposing the metal body at the cracks and the periphery; flaw detection is carried out on the crack in a magnetic powder flaw detection or dye flaw detection mode, and the extending path, the extending direction and the extending end point of the crack are determined; B. drilling a crack stop hole at the end point of the crack by using a drill bit, and preventing the crack from continuously developing and extending due to heating in the welding process; C. cutting a groove at the crack, processing the groove by adopting a carbon arc gouging, and then rapidly oxidizing and stripping the dissolved metal by using high-pressure air; D. welding cracks, namely fixing the cracks on the bottom surface of the frame body by using section welding and a welding reinforcement pull plate before welding, and welding the cracks on the beam plates on the two sides of the side beam of the frame body by using a section welding method; E. and polishing the welding line to be flat, and adding a reinforcing plate in the welding line area of the beam plates on the two sides. The invention can solve the problems that the existing locomotive bogie is easy to crack and difficult to repair.
Description
Technical Field
The invention relates to the technical field of steel manufacturing equipment manufacturing, in particular to a method for detecting and repairing cracks of a bogie of a metallurgical railway diesel locomotive.
Background
A diesel locomotive (locomotive for short) in a metallurgical enterprise is an essential standard rail transport tool in the production process of a ferrous metallurgical enterprise and is used for transporting railway transport operations such as raw fuel taking and delivering, blast furnace molten iron, steel outgoing and the like. The bogie is the running part of the locomotive and plays a decisive role in the dynamic performance and the running safety of the locomotive. The bogie frame of the locomotive is easy to crack due to the fact that the frame body of the bogie frame bears various working conditions of the locomotive during operation, vertical loads from the weight of the upper part of a locomotive body, forces during traction and braking of the locomotive, horizontal and transverse forces and centrifugal forces during passing through a curve and other factors. Particularly, the geographical position of a metallurgical enterprise is limited, the curve of a railway line is too large, and the side beam of the frame body is accepted to have crack diseases along with long-time application. After cracks appear, the frame body of the whole bogie needs to be completely disassembled, and then the whole bogie is detected and repaired one by one, and in addition, the complex overhaul and approval process needs 25 days at least, and the cost is quite high. A new maintenance method is urgently needed to quickly repair the bogie of the locomotive, improve the working efficiency and reduce the enterprise cost.
Disclosure of Invention
The invention aims to solve the problem of providing a method for overhauling cracks of a metallurgical railway internal combustion locomotive bogie, and aims to solve the problems that the existing locomotive bogie is easy to crack and difficult to repair.
In order to solve the problems, the technical scheme of the invention is as follows: the method for repairing the cracks of the bogie of the metallurgical railway diesel locomotive comprises the following steps:
A. under the condition of not dismantling the bogie frame, removing the paint surface and oil stains near the cracks of the frame body, and exposing the metal body at the cracks and the periphery; flaw detection is carried out on the crack in a magnetic powder flaw detection or dye flaw detection mode, and the extending path, the extending direction and the extending end point of the crack are determined;
B. drilling a crack stop hole at the end point of the crack by using a drill bit, and preventing the crack from continuously developing and extending due to heating in the welding process;
C. cutting a groove at the crack, processing the groove by adopting a carbon arc gouging, rapidly oxidizing and stripping the dissolved metal by using high-pressure air, and keeping the surface temperature of the crack between 40 ℃ and 45 ℃ all the time;
D. welding cracks, namely fixing the cracks on the bottom surface of the frame body by using section welding and a welding reinforcement pull plate before welding, and welding the cracks on the beam plates on the two sides of the side beam of the frame body by using a section welding method;
E. and polishing the welding line to be flat, and adding a reinforcing plate in the welding line area of the beam plates on the two sides.
In the above technical solution, a more specific solution may be: and C, cutting the groove at an angle of 45 degrees.
Further: and the groove treatment in the step C comprises the steps of firstly adopting a carbon arc air gouging to treat the groove, after the metal is dissolved by the carbon arc at high temperature, quickly oxidizing and stripping the dissolved metal by using high-pressure air, and keeping the surface temperature of the crack between 40 ℃ and 45 ℃ all the time so as not to generate excessive thermal deformation.
Further: the segment welds in step D were about 10 mm.
Further: and E, adding the reinforcing plate in the step E, and then derusting and spraying paint again on the welding repair part.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the method for repairing the cracks of the metallurgical railway diesel locomotive bogie is applied to the actual repair process of the locomotive bogie, the crack stop holes effectively prevent the cracks from expanding, the temperature of the groove processing line of the cracks is in a range, the excessive thermal deformation of the side beam plate of the frame body is avoided, and reinforcing plates are further added around the cracks according to the requirements of a welding process to ensure the integral rigidity of the frame body; the whole repairing process can be completed within 2 days by using the process, the application and popularization of the method for overhauling are greatly shortened, the shortage of railway vehicles is effectively relieved, and the process plays an active role in carrying out high-quality and high-efficiency molten iron taking and delivering operation, steel outgoing operation and raw fuel returning traction operation on the locomotives for metallurgical railways.
Drawings
FIG. 1 is a front view of an embodiment of the present invention;
fig. 2 is a top view of an embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in further detail with reference to the accompanying drawings:
the method for repairing the cracks of the bogie of the metallurgical railway diesel locomotive is adopted to repair four special bogies of the metallurgical railway locomotives, such as DF12 type 0190 locomotives, 0177 locomotives and the like shown in figures 1 and 2, and comprises the following steps:
A. disassembling parts such as a traction rod device, a second traction motor connecting lead, a brake cylinder air pipe and the like of the locomotive bogie, keeping the bogie body in a balanced state, and removing paint surfaces and oil stains near cracks of the bogie body 1 under the condition that the bogie body 1 is not disassembled to expose metal bodies at the cracks and the periphery; and (4) flaw detection is carried out on the crack by using a magnetic powder flaw detection or dye flaw detection mode, and the extending path, direction and end point of the crack are determined.
B. And drilling a crack stop hole by using a drill bit with the diameter of more than 14 at the crack end point to prevent the crack from continuously developing and extending due to the heating in the welding process. As the side beams of the frame body 1 belong to box beams, and the beam plates of the inner and outer side beams 1-1 are all cracked, crack-stopping holes need to be drilled at the crack terminal points of the beam plates of the inner and outer side beams 1-2.
C. And cutting a 45-degree groove at the crack to ensure the welding strength. For the treatment of the groove, firstly, a carbon arc air gouging is adopted to treat the groove, after the metal is dissolved by the carbon arc at high temperature, the dissolved metal is quickly oxidized and stripped by high-pressure air, and the temperature of the surface of the crack is always between 40 ℃ and 45 ℃, so that excessive thermal deformation cannot occur. (the gas cutting method for beveling the molten metal cannot be used, because the crack is long and belongs to a through crack, the frame body crack is heated to generate deformation in the gas cutting beveling process, the frame body is in danger of being scrapped due to overlarge deformation, and therefore the beveling cannot be processed by a high-temperature method in the crack beveling process).
D. The welding cracks are longer in crack extension of the bogie frame body, and beam plates (the inner side beam 1-2, the outer side beam 1-1 and the bottom side beam 1-3) on the inner side, the outer side and the bottom side are required to be welded and repaired, so that in order to prevent the frame body from being heated and deformed by a large amount of heat generated in the welding and repairing process, the surface cracks of the bottom side beam 1-3 of the frame body are firstly fixed by using a welding reinforcing pull plate by using a section welding method for about 10mm before welding so as to avoid stress dragging deformation generated when welding two sides, and the beam plate cracks on the two sides of the side beam of the frame body are firstly welded by using the section welding method, and finally the full-weld.
E. In order to ensure the integral rigidity requirement of the frame body, after the crack welding is finished, the welding line is polished to be flat, and a reinforcing plate with the thickness of 300 mm multiplied by 250mm multiplied by 12mm is added in the welding line area of the beam plates of the beams on the two sides; and re-assembling the corresponding disassembled parts, and re-derusting and painting the welding repair part, thereby finishing the repair process.
The method is used for overhauling the special direction frames of four metallurgical railway locomotives, such as DF12 type 0190 locomotives and 0177 locomotives, the result meets the technical requirements of the process, the locomotives run stably, an ideal effect is obtained, each locomotive finishes the repair work within 2 days, and the practical effects of time saving, high efficiency, cost reduction and efficiency improvement are achieved.
Claims (5)
1. A method for repairing cracks of a bogie of a metallurgical railway diesel locomotive is characterized by comprising the following steps:
A. under the condition of not dismantling the bogie frame, removing the paint surface and oil stains near the cracks of the frame body, and exposing the metal body at the cracks and the periphery; flaw detection is carried out on the crack in a magnetic powder flaw detection or dye flaw detection mode, and the extending path, the extending direction and the extending end point of the crack are determined;
B. drilling a crack stop hole at the end point of the crack by using a drill bit, and preventing the crack from continuously developing and extending due to heating in the welding process;
C. cutting a groove at the crack, processing the groove by adopting a carbon arc gouging, rapidly oxidizing and stripping the dissolved metal by using high-pressure air, and keeping the surface temperature of the crack between 40 ℃ and 45 ℃ all the time;
D. welding cracks, namely fixing the cracks on the bottom surface of the frame body by using section welding and a welding reinforcement pull plate before welding, and welding the cracks on the beam plates on the two sides of the side beam of the frame body by using a section welding method;
E. and polishing the welding line to be flat, and adding a reinforcing plate in the welding line area of the beam plates on the two sides.
2. The metallurgical railway diesel locomotive bogie crack repair method of claim 1, wherein: and C, cutting the groove at an angle of 45 degrees.
3. The metallurgical railway diesel locomotive bogie crack repair method of claim 2, wherein: and the groove treatment in the step C comprises the steps of firstly adopting a carbon arc air gouging to treat the groove, after the metal is dissolved by the carbon arc at high temperature, quickly oxidizing and stripping the dissolved metal by using high-pressure air, and keeping the surface temperature of the crack between 40 ℃ and 45 ℃ all the time so as not to generate excessive thermal deformation.
4. The metallurgical railway diesel locomotive bogie crack repair method according to any one of claims 1 to 3, wherein: the segment welds in step D were about 10 mm.
5. The metallurgical railway diesel locomotive bogie crack repair method of claim 4, wherein: and E, adding the reinforcing plate in the step E, and then derusting and spraying paint again on the welding repair part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011253709.4A CN112355567A (en) | 2020-11-11 | 2020-11-11 | Method for repairing cracks of bogie of metallurgical railway diesel locomotive |
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| CN106270925A (en) * | 2016-09-30 | 2017-01-04 | 中车南京浦镇车辆有限公司 | Sleeper beam welding Tracheal reconstruction technique |
| CN108161333A (en) * | 2017-12-29 | 2018-06-15 | 马钢(集团)控股有限公司 | A kind of welding repair method of Dump Truck Frame |
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| CN101053926A (en) * | 2007-05-31 | 2007-10-17 | 四川东风电机厂有限公司 | Axial-flow rotary propeller type water turbine runner blade crackle treating method |
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| CN105750814A (en) * | 2014-12-15 | 2016-07-13 | 重庆迅升机车配件有限公司 | Repairing technology for fusion welding joint deficiency |
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