CN114515936A - Bearing fretting wear treatment method - Google Patents
Bearing fretting wear treatment method Download PDFInfo
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- CN114515936A CN114515936A CN202210212557.6A CN202210212557A CN114515936A CN 114515936 A CN114515936 A CN 114515936A CN 202210212557 A CN202210212557 A CN 202210212557A CN 114515936 A CN114515936 A CN 114515936A
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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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D5/00—Heat treatments of cast-iron
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
Abstract
The embodiment of the application discloses a bearing fretting wear processing method, which is used for solving the problem of wear of a contact surface between a bearing support and a spherical cushion block. The method of the embodiment of the application comprises the following steps: roughly machining the bearing support to enable the size of the contact surface of the bearing support to meet a first preset size and the contact surface of the bearing support to meet a first surface roughness, wherein the first preset size comprises the machining allowance of the contact surface of the bearing support; cleaning the surface of the contact surface of the bearing support after rough machining to remove surface attachments of the contact surface of the bearing support; performing finish machining on the contact surface of the bearing support after surface cleaning so that the ball diameter size of the contact surface of the bearing support meets a second preset size; and polishing the contact surface of the bearing support after finish machining so as to enable the contact surface of the bearing support to reach a second surface roughness.
Description
Technical Field
The embodiment of the application relates to the field of bearing abrasion treatment, in particular to a bearing fretting abrasion treatment method.
Background
A turbine is a thermal turbine which takes steam as a working medium and converts the heat energy of the steam into mechanical work, a shaft system of a supercritical steam turbine generator unit is composed of a high-pressure rotor, a medium-pressure rotor, two low-pressure rotors, a generator rotor, an exciter rotor and 8 supporting bearings, the medium-pressure cylinder and 2 low-pressure cylinders respectively only have one supporting bearing, namely 4 rotors of the steam turbine generator unit are supported by 5 bearings. The 5 support bearings are all specially optimized bag type bearings and are respectively located in the 5 floor type bearing seats.
In the existing domestic set, some sets have different-degree shafting vibration problems, and some sets are even further deteriorated, so that the safe and stable operation of the sets is seriously influenced. The steam turbine overhaul period is generally set to 12 years, but 6 months of present some steam turbines just need overhaul, not only have accident potential, and passive maintenance also can greatly increase the cost of overhaul.
In the overhaul of the unit, the bearing is found to have a common wear condition, namely fretting wear is generated on the part of the contact surface of the bearing support and the contact surface of the spherical cushion block, wherein the bearing support is generally made of nodular cast iron, and the spherical cushion block is generally made of low alloy steel. The contact surface wear not only affects the shafting elevation, but also increases the clearance between the contact surfaces along with the continuous increase of the wear loss, and causes the deterioration of shafting vibration. If the shape of the damaged bearing support or the damaged spherical cushion block is recovered according to the original design scheme, similar damage still occurs again after the operation for about half a year, but the new design scheme used by the current manufacturing plant has certain risk without experimental certification. Therefore, a method for effectively solving the abrasion between the bearing support and the spherical cushion block needs to be found.
Disclosure of Invention
The embodiment of the application provides a bearing fretting wear processing method, which is used for solving the problem of wear of a contact surface between a bearing support and a spherical cushion block.
According to a first aspect of the embodiments of the present application, there is provided a bearing fretting wear processing method, for processing a bearing bracket, the method including:
roughly machining the bearing support to enable the size of the contact surface of the bearing support to meet a first preset size and the contact surface of the bearing support to meet a first surface roughness, wherein the first preset size comprises the machining allowance of the contact surface of the bearing support;
cleaning the surface of the contact surface of the bearing support after rough machining to remove surface attachments of the contact surface of the bearing support;
performing finish machining on the contact surface of the bearing support after surface cleaning so as to enable the spherical diameter size of the contact surface of the bearing support to meet a second preset size;
and polishing the contact surface of the bearing support after finish machining so as to enable the contact surface of the bearing support to reach a second surface roughness.
Optionally, before rough machining the bearing bracket, the method further comprises:
and processing the contact surface of the bearing support by adopting a laser cladding method.
Optionally, before the surface cleaning is performed on the contact surface of the bearing support after rough machining, the method further comprises:
And roughly machining the non-contact surface of the bearing support so that the size of the non-contact surface of the bearing support meets a third preset size.
Optionally, after polishing the finished bearing support contact surface, the method further comprises:
and carrying out contact inspection on the contact surface of the bearing support.
Optionally, the contact checking the contact surface of the bearing support comprises:
carrying out flaw detection on the contact surface of the bearing support to detect whether the contact surface of the bearing support has defects;
if the contact surface of the bearing support has no defects, detecting whether the contact uniformity or the contact area of the contact surface of the bearing support meets preset conditions by adopting a red lead pressing method;
if the contact uniformity and the contact area of the contact surface of the bearing support meet the preset conditions, ending the processing flow;
and if the contact uniformity or the contact area of the contact surface of the bearing support does not meet the preset conditions, returning to the step of polishing the contact surface of the bearing support after finish machining.
According to the embodiment, the contact surface of the bearing support is treated by adopting a laser cladding method, so that the crack defects are avoided as much as possible, the wear resistance of the contact surface is improved, and the wear of the bearing support is effectively reduced.
According to a second aspect of the embodiments of the present application, there is provided a method for treating fretting wear of a bearing, the method including:
Roughly machining the spherical cushion block to enable the size of the contact surface of the spherical cushion block to meet a fourth preset size and the contact surface of the spherical cushion block to meet third surface roughness, wherein the fourth preset size comprises machining allowance of the contact surface of the spherical cushion block;
carrying out surface cleaning on the roughly machined spherical cushion block contact surface to remove surface attachments of the spherical cushion block contact surface;
performing finish machining on the contact surface of the spherical cushion block subjected to surface cleaning to enable the spherical diameter size of the contact surface of the spherical cushion block to meet a fifth preset size;
and polishing the contact surface of the spherical cushion block after finish machining so as to enable the contact surface of the spherical cushion block to reach a fourth surface roughness.
Optionally, before the rough machining of the spherical pad block, the method further includes:
and processing the contact surface of the spherical cushion block by adopting a laser quenching method.
Optionally, before the surface cleaning is performed on the contact surface of the roughly machined spherical cushion block, the method further includes:
and roughly machining the non-contact surface of the spherical cushion block so that the size of the non-contact surface of the spherical cushion block meets a sixth preset size.
Optionally, after polishing the contact surface of the spherical pad after finishing, the method further comprises:
and (5) carrying out contact inspection on the contact surface of the spherical cushion block.
Optionally, the performing a contact check on the spherical pad contact surface comprises:
carrying out flaw detection on the contact surface of the spherical cushion block to detect whether the contact surface of the spherical cushion block has defects or not;
if the contact surface of the spherical cushion block has no defects, detecting whether the contact uniformity or the contact area of the contact surface of the spherical cushion block meets preset conditions by adopting a red lead pressing method;
if the contact uniformity and the contact area of the contact surface of the spherical cushion block meet the preset conditions, ending the processing flow;
and if the contact uniformity or the contact area of the contact surface of the spherical cushion block does not meet the preset conditions, polishing the contact surface of the spherical cushion block after finish machining.
In the embodiment, the contact surface of the spherical cushion block is treated by adopting a laser quenching method, so that the crack defects are avoided as much as possible, the wear resistance of the contact surface is improved, and the wear of the spherical cushion block is effectively reduced.
According to the technical scheme, the embodiment of the application has the following advantages:
the invention solves the fretting wear problem between the bearing support and the spherical cushion block of the steam turbine, and designs a treatment process and a surface treatment process. The contact surface of the bearing support is processed by adopting a laser cladding method, and the contact surface of the spherical cushion block is processed by adopting a laser quenching method. Practice proves that the method can effectively inhibit fretting wear of the contact surfaces of the bearing support and the spherical cushion block, prolong the overhaul period and improve the overall safety of equipment. In addition, the bearing support is made of nodular cast iron, and the laser cladding mode is selected, so that the surface strength and the wear resistance are improved, and the advantage of the mechanical property of a nodular cast iron matrix is kept.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art according to these drawings.
FIG. 1 is a schematic representation of a steam turbine shafting according to an embodiment of the present application;
FIG. 2 is a schematic view of a bearing support according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a spherical spacer according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an embodiment of a method for treating fretting wear of a bearing according to an embodiment of the present application;
FIG. 5 is a schematic view of another embodiment of the bearing fretting wear treatment method according to the embodiment of the present application.
Wherein the reference numerals are:
101. a bearing support; 102. a bearing support contact surface; 103. a spherical cushion block; 104. a spherical pad contact surface.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless explicitly stated or limited otherwise; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, fig. 1 is a schematic view of a steam turbine shaft system according to an embodiment of the present application.
The steam turbine is a thermal turbine which takes steam as a working medium and converts the heat energy of the steam into mechanical work, and has the characteristics of high rotating speed, high efficiency, safe and reliable operation and the like. The existing shaft system of a supercritical steam turbine generator unit is composed of a high pressure rotor (HP), a medium pressure rotor (IP), two low pressure rotors (LP), a generator rotor (GE), an exciter rotor (EX) and 8 support bearings (#1 to # 8). The middle pressure cylinder and the 2 low pressure cylinders respectively only have one supporting bearing, namely parts #1, #2 and #3, namely 4 rotors of the steam turbine set are supported by 5 bearings, and specifically, the 4 rotors are respectively a high pressure rotor, a middle pressure rotor, a low pressure No. 1 rotor and a low pressure No. 2 rotor; the 5 bearings are #1, #2, #3, #4 and #5 bearings, respectively. The 5 support bearings are all specially optimized bag type bearings and are respectively located in the 5 floor type bearing seats. The #1 bearing is a bag bearing, is a special form of an elliptical bearing, and has higher bearing capacity compared with a conventional tilting pad bearing.
It should be understood that the "|" symbol in fig. 1 at the junction of two bearings indicates the boundary between the two bearings and also indicates the structure where there is a flange connection. It can also be understood that the working medium described above generally represents a medium substance for realizing the interconversion between the thermal energy and the mechanical energy, and the turbine described above generally represents a machine for converting the energy contained in the fluid medium into the mechanical work, which may be called a turbine, and will not be described in detail later.
In the generator set put into operation in China at present, the problem of shafting vibration of different degrees partially occurs, and some of the problems are even further worsened, so that the stable operation of the generator set is seriously influenced. According to the design demand, general steam turbine overhaul cycle is 12 years, however, about half a year just need overhaul at present, and this kind of condition not only has accident potential, and passive maintenance also can greatly increase the cost of overhaul.
Referring to fig. 2 and 3, fig. 2 is a schematic structural diagram of a bearing bracket according to an embodiment of the present disclosure, and fig. 3 is a schematic structural diagram of a spherical spacer according to an embodiment of the present disclosure.
During maintenance, it is often found that the #1 bearing in fig. 1 has common wear conditions, i.e., fretting wear is locally generated on the bearing bracket contact surface 102 and the spherical pad contact surface 104. Wherein, the bearing bracket 101 is made of nodular cast iron, and the spherical cushion block 103 is made of low alloy steel. It can be understood that, the design materials of the bearing support 101 and the spherical cushion block 103 are not limited, and the design materials of the bearing support 101 and the spherical cushion block 103 may be other materials, for convenience of understanding and description, the design materials of the bearing support 101 described later are all nodular cast iron, the design materials of the spherical cushion block 103 are all low alloy steel, and the details are not described later.
The bearing bracket 101 functions to support the bearing while restricting the displacement of the bearing. At present, a brand new design structure is recommended to be selected by a manufacturer, and certain risks exist without a large amount of actual verification. Therefore, a method capable of effectively solving the problem of abrasion of the bearing bush support and the spherical cushion block is required to be found. Therefore, the embodiment of the application provides a bearing fretting wear processing method, which is used for solving the problem of wear of a contact surface of a bearing support and a spherical cushion block.
It should be understood that the contact surface described in the embodiment of the present application is a contact surface between the bearing bracket and the spherical spacer, and details thereof are not described later.
Referring to fig. 4, fig. 4 is a schematic view illustrating an embodiment of a method for treating fretting wear of a bearing according to an embodiment of the present application, for treating a bearing bracket, including steps 401 and 406.
401. And carrying out process test on the bearing support.
Firstly, determining to process the contact surface of the bearing support by adopting a laser cladding method, and then carrying out a process test on the bearing support. It can be understood that the laser cladding technology is a process method which is used for placing selected coating materials on the surface of a coated substrate in different filling modes, melting a thin layer of the coating materials on the surface of the substrate simultaneously through laser irradiation, and forming a surface coating which has extremely low dilution degree and is metallurgically combined with the substrate material after rapid solidification, thereby obviously improving the wear resistance, corrosion resistance, heat resistance, oxidation resistance, electrical appliance characteristics and the like of the surface of the substrate material.
It is also understood that other methods may be used to treat the contact surface of the bearing support, such as carburizing, sulfurizing, laser quenching, etc., and the bearing support treatment method is not limited herein, only because the nodular cast iron used in the bearing support has the characteristics of non-uniform structure, high carbon content, and many impurity elements. If the bearing support is subjected to carburization, nitridation and other treatments, the bearing support is easy to deform and can crack. If a laser quenching process is adopted, the problem of local ablation of the surface is easy to occur due to the nonuniformity of tissues, so that the purpose of improving the surface hardness and the wear resistance can be achieved by adopting a laser cladding method for forming metallurgy with a matrix and combining the advantages of nickel-based powder. For convenience of description, the processing mode of the bearing support is not described in the following.
After the laser cladding method is determined, the single component which has the same structure and material as the bearing support and is in a heat treatment state can be selected and subjected to a process test, and the single component can not be a final product without difficulty.
Then, the 5 factors are changed according to the orthogonal method, and the scheme with the best effect is preferred. Specifically, according to the orthogonal method, the following factors are preferably selected from the influencing factors such as laser power, laser scanning speed, the number of cladding layers, surface hardness and cladding layer depth: metallurgical bonding of the cladding layer and the substrate, no crack defects between the cladding layer and the substrate, and surface hardness of 280 +/-30 Brinell Hardness (HB). When the optimal solution is determined, the optimal solution is applied to the treatment of the contact surface of the bearing support.
Specifically, the bearing support laser cladding specific process comprises the following steps: the cladding layer is 1 layer, and thickness 0.5 ~ 0.8mm, and laser power is 1.6kW, and laser scanning speed is 400mm/min, and facula diameter 3mm send the powder to be 3.2r/min, and cladding temperature is the normal temperature, simultaneously, adopts the sclerometer to detect cladding layer surface hardness, and the hardness needs to satisfy 280 HB 30. It can be understood that the present embodiment does not limit the numerical values of the specific parameters in the laser cladding process scheme, and the specific numerical value described is only a specific implementation manner of the present embodiment, which is not described in detail later.
It is also understood that the welding powder is fed simultaneously when the laser cladding method is used. Specifically, the synchronous welding powder feeding refers to an operation process of directly conveying laser cladding powder into a light spot by using an air-borne powder feeder, and forming a cladding layer along with the movement of the light spot on the surface of a workpiece. The method for realizing synchronous powder feeding specifically comprises the steps of feeding powder in a lateral mode and feeding powder in a coaxial mode. The embodiment does not limit the powder feeding manner, and other methods may be used for feeding powder, and are not limited herein. It is understood that compared with the preset powder feeding mode, the synchronous powder feeding can well realize gas protection, so that the performance of the cladding powder is not influenced by elements such as oxygen, nitrogen and the like in the air. It can be understood that the welding powder described above uses Ni20A as the powder, i.e. a Ni-B-Si alloy powder with low hardness, which has good self-fluxing property, wettability and spray weldability, and the spray coating has good corrosion resistance, wear resistance, impact resistance, high-temperature oxidation resistance and good machinability.
402. And (5) roughly machining the contact surface of the bearing support.
After the contact surface of the bearing support is treated by adopting a laser cladding method, the bearing support is roughly machined according to a design drawing, and except the contact surface of the bearing support, other machining surfaces of the bearing support, namely the non-contact surface of the bearing support, are machined to a preset size and a preset surface roughness. Specifically, the length of the non-contact surface of the bearing support is 375mm, the width is 200mm, and the height is 95 mm. It should be understood that, in this embodiment, the size of the non-contact surface of the bearing bracket is not limited, and the size of the non-contact surface of the bearing bracket may also be other values, which are not limited herein.
It should be noted that when the non-contact surface of the bearing bracket is roughly processed according to the design drawing, at least 0.1mm of processing allowance needs to be reserved for the contact surface of the bearing bracket and the contact surface of the spherical cushion block, and meanwhile, the surface roughness of the contact surface of the bearing bracket needs to be processed to Ra1.6. It can be understood that, in this embodiment, the numerical values of the specific parameters in the machining allowance and the surface roughness are not limited, and the specific numerical value described is only a specific implementation manner of this embodiment, and is not described in detail later. It should also be understood that when the bearing support is processed by the laser cladding method, the size of the spherical diameter of the contact surface of the bearing support changes, so that a processing allowance needs to be reserved.
Therefore, it can be easily understood that the rough machining described in the above can be understood as machining the whole structure of the bearing support so as to meet the size design requirement of the original bearing support. It can also be understood that after rough machining of the bearing support, the dimensions and surface roughness of other machined surfaces, except the bearing support contact surface, meet the design requirements.
It should be further understood that, since the present embodiment only makes substantial changes on the contact surface of the bearing bracket, the non-contact surface of the bearing bracket is not described again, and is not described again in the following.
403. And carrying out surface treatment on the contact surface of the bearing support.
And carrying out surface treatment on the contact surface of the bearing support after rough machining. Specifically, the contact surface of the bearing support is firstly subjected to surface cleaning to remove large solid particles attached to the contact surface of the bearing support. Then, firstly using absolute ethyl alcohol, then using acetone to wipe the contact surface, removing attachments such as surface oil stains and the like, and finally waiting for the acetone to naturally volatilize, and drying the surface.
It can be understood that the contact surface described in this embodiment is a contact surface of the bearing bracket, that is, a contact surface between the bearing bracket and the spherical spacer, for convenience of description, the following description only describes the contact surface, and no further description is provided herein.
It is also understood that the present embodiment is not limited to the wipe on the contact surface, and the wipe may be other liquids, and is not limited thereto.
404. And carrying out finish machining on the contact surface of the bearing support.
And performing finish machining on the contact surface of the bearing support subjected to surface treatment. Specifically, the contact surface of the bearing support is finely processed so that the spherical diameter size of the contact surface of the bearing support meets the spherical diameter phi 660+0.08mm, which means a sphere diameter of 660mm and a positive deviation of 0.08 mm. It will be understood that the ball diameter of the contact surface of the bearing bracket corresponds to the ball diameter of the contact surface of the spherical spacer. The positive deviation parameter is the tolerance of part processing, is a deviation value, and is also the qualified range of product size in the design drawing. When the height of the bearing support needs to be adjusted, a stainless steel backing plate is arranged below the bearing support, and the height of the center of the bearing is adjusted by adjusting the thickness of the stainless steel backing plate.
It can be understood that, in this embodiment, the numerical value of the specific parameter of the spherical diameter size of the contact surface of the bearing support is not limited, and the specific numerical value described is only a specific implementation manner of this embodiment, and is not described again in the following.
Thus, it will be understood that the finishing described above may be understood as machining the bearing support contact surface to meet the dimensional design requirements of the original bearing support contact surface. It can also be understood that the finish machining only aims at the contact surface of the bearing support, and the ball diameter size and the surface roughness of the contact surface of the bearing support after the finish machining meet the design requirements.
405. And polishing the contact surface of the bearing support.
And polishing the contact surface of the bearing support after finish machining. Specifically, the contact surface of the bearing support is firstly ground, and then the contact surface of the bearing support is polished, so that the surface roughness of the contact surface of the bearing support reaches Ra0.6, and meanwhile, rust can also be removed. It can be understood that, in this embodiment, the value of the specific parameter in the surface roughness of the contact surface of the bearing support is not limited, and the specific value described is only a specific implementation manner of this embodiment, and is not described again in the following.
406. And carrying out contact inspection on the contact surface of the bearing support.
And carrying out contact inspection on the polished contact surface of the bearing support. Specifically, the contact surface of the bearing support is subjected to penetrant inspection to determine whether the surface has obvious defects such as pores or cracks.
If the surface has defects such as air holes or cracks, repeating the step 405, and continuously grinding the contact surface of the bearing support;
if the surface has no defects such as obvious pores or cracks, whether the contact surface of the bearing support and the contact surface of the spherical cushion block are uniformly contacted or not is detected by a red lead pressing method, and whether the contact area between the contact surface of the bearing support and the contact surface of the spherical cushion block is larger than 80 percent or not is detected, namely the contact surface of the bearing support and the contact surface of the spherical cushion block are polished and then are pressed oppositely.
If the contact surface is uniformly contacted and the contact area is larger than 80%, the above-mentioned flow is ended.
If the contact surface is not uniform or the contact area is not greater than 80%, step 405 is repeated and the grinding of the contact surface of the bearing support is continued.
It can be understood that the present embodiment does not limit the specific numerical value of the contact area, and the specific numerical value described is only one of the preferred solutions, which is not described in detail later.
According to the embodiment, the contact surface of the bearing support is treated by adopting a laser cladding method, so that the crack defects are avoided as much as possible, the wear resistance of the contact surface is improved, and the wear of the bearing support is effectively reduced. Meanwhile, the bracket is made of nodular cast iron, and the laser cladding mode is selected, so that the surface strength and the wear resistance are improved, and the advantage of the mechanical property of a nodular cast iron matrix is kept.
Referring to fig. 5, fig. 5 is a schematic view illustrating another embodiment of a method for treating fretting wear of a bearing according to an embodiment of the present application, for treating a spherical spacer, including steps 501 and 506.
501. The spherical cushion blocks were subjected to a process test.
Firstly, determining to process the contact surface of the spherical cushion block by a laser quenching method. It will be appreciated that laser quenching is a quenching technique in which the surface of a material is hardened by heating the surface of the material above the transformation point using a laser and as the material cools itself, the austenite transforms to martensite.
It will also be appreciated that other methods may be used to treat the contact surface of the spherical pad, such as carburizing, nitriding, carbonitriding, and the like, and the method of treating the spherical pad is not limited herein. Meanwhile, the low alloy steel material adopted by the spherical cushion block has simple manufacturing process, less material impurities and enough impact toughness. The design aim is to ensure the strength of the material, and the spherical cushion block is made of low alloy steel because the spherical cushion block needs to have enough impact toughness.
It should also be understood that when the laser quenching method is used to treat the contact surface of the spherical cushion block, the graphite powder blackening treatment and argon side-blowing protection are carried out on the surface of the spherical cushion block. It is understood that the graphite powder has a good light absorption effect, and can reduce the reflection intensity of reflected light. It can be easily understood that when the contact surface of the spherical cushion block is processed by adopting a laser quenching mode, a layer of graphite powder is fully paved on the contact surface of the spherical cushion block, and the surface hardness of the contact surface of the spherical cushion block can be changed through the property of the light absorption effect of the graphite powder. It is also understood that the increase in surface hardness is primarily obtained by changes in surface temperature and rate of decrease in temperature.
After the laser quenching method is determined, a sample plate with the same structure and material as the spherical cushion block and an individual part in a heat treatment state are selected and subjected to a process test, so that the individual part can not be a final product.
Then, the 3 factors are varied according to the orthogonal method, and the most effective scheme is preferred. Specifically, according to the orthogonal method, the following factors are preferably selected from the influencing factors such as laser power, laser scanning speed and surface hardness: no surface crack defects and surface hardness of 320 +/-30 HB. When the optimal scheme is determined, the optimal scheme is applied to the treatment of the contact surface of the spherical cushion block.
Specifically, the laser quenching process of the spherical cushion block comprises the following steps: the laser power is 4.5kW, the laser scanning speed is 3m/min, and meanwhile, the hardness of the surface is detected by a hardness tester, and the hardness meets 320 +/-30 HB. It can be understood that the present embodiment does not limit the numerical values of the specific parameters in the laser quenching process scheme, and the specific numerical value described is only a specific implementation manner of the present embodiment, which is not described in detail later.
502. And (4) roughly processing the contact surface of the spherical cushion block.
After the contact surface of the spherical cushion block is processed by adopting a laser quenching method, the spherical cushion block is roughly processed according to a design drawing, and other processing surfaces of the spherical cushion block, namely the non-contact surface of the spherical cushion block, except the contact surface of the spherical cushion block are processed to a preset size and a preset surface roughness. Specifically, the length of the non-contact surface of the spherical cushion block is 395mm, the width is 79mm, and the height is 100 mm. It is understood that the size of the non-contact surface of the spherical spacer block is not limited in this embodiment, and the size of the non-contact surface of the spherical spacer block may also be other values, which are not limited herein.
It should be noted that when the non-contact surface of the spherical cushion block is roughly processed according to the design drawing, at least 0.1mm of processing allowance needs to be reserved for the contact surface of the spherical cushion block and the contact surface of the bearing support, and meanwhile, the surface roughness of the contact surface of the spherical cushion block needs to be processed to Ra1.6. It can be understood that, in this embodiment, the numerical values of the specific parameters in the machining allowance and the surface roughness are not limited, and the specific numerical value described is only a specific implementation manner of this embodiment, and is not described in detail later. It should also be understood that when the spherical pad is processed by the laser quenching method, the spherical diameter of the contact surface of the spherical pad changes, so that a processing allowance needs to be reserved.
Therefore, it can be easily understood that the rough machining described in the above can be understood as machining the whole structure of the spherical cushion block so as to meet the size design requirement of the original spherical cushion block. It can also be understood that after the spherical cushion block is roughly machined, the sizes and the surface roughness of other machined surfaces except the contact surface of the spherical cushion block meet the design requirements.
It should be further understood that, since the present embodiment only makes substantial changes on the contact surface of the spherical spacer block, the non-contact surface of the spherical spacer block is not described in the following, and further description thereof is not repeated in the following.
503. And carrying out surface treatment on the contact surface of the spherical cushion block.
And carrying out surface treatment on the contact surface of the roughly processed spherical cushion block. Specifically, the contact surface of the spherical cushion block is firstly subjected to surface cleaning to remove large solid particles attached to the contact surface of the spherical cushion block. Then, firstly using absolute ethyl alcohol, then using acetone to wipe the contact surface, removing attachments such as surface oil stains and the like, and finally waiting for the acetone to naturally volatilize, and drying the surface.
It can be understood that the contact surface described in this embodiment is a contact surface of the spherical pad block, that is, a contact surface between the spherical pad block and the spherical pad block, for convenience of description, the following description only describes the contact surface, and the description thereof is not repeated herein.
It is also understood that the present embodiment is not limited to the wipe contacting the surface, and the wipe may be other liquids, and is not limited thereto.
504. And (5) performing finish machining on the contact surface of the spherical cushion block.
And performing finish machining on the contact surface of the spherical cushion block subjected to surface treatment. Specifically, the contact surface of the spherical cushion block is finely processed so that the size of the spherical diameter of the contact surface of the spherical cushion block meets the spherical diameter
Indicating a sphere diameter of 660mm and a negative deviation of 0.08mm or 0.16 mm. It will be appreciated that the ball diameter of the contact surface of the spherical spacer now corresponds to the ball diameter of the contact surface of the bearing bracket. The negative deviation parameter is the tolerance of part processing, is a deviation value and is also the qualified range of product size in the design drawing. . Can be used for It is to be understood that, in this embodiment, the value of the specific parameter of the spherical diameter size of the contact surface of the spherical cushion block is not limited, and the specific value described is only a specific implementation manner of this embodiment, and is not described in detail later.
Thus, it will be understood that the finishing described above may be understood as machining the spherical pad interface to meet the dimensional design requirements of the original spherical pad interface. . The method can also be understood that the finish machining only aims at the contact surface of the spherical cushion block, and the spherical diameter size and the surface roughness of the contact surface of the spherical cushion block after the finish machining meet the design requirements.
505. And polishing the contact surface of the spherical cushion block.
And polishing the contact surface of the spherical cushion block after finish machining. Specifically, the contact surface of the spherical cushion block is firstly ground and then polished so as to achieve the surface roughness of the contact surface of the spherical cushion block, and meanwhile, rust can also be removed. It can be understood that, in this embodiment, the value of the specific parameter in the surface roughness of the contact surface of the spherical spacer is not limited, and the specific value described is only a specific implementation manner of this embodiment, which is not described again in the following.
506. And (5) carrying out contact inspection on the contact surface of the spherical cushion block.
And (5) carrying out contact inspection on the contact surface of the polished spherical cushion block. Specifically, the contact surface of the spherical cushion block is subjected to penetration flaw detection, and whether the surface has obvious defects such as air holes or cracks or not is determined.
If the surface has defects such as air holes or cracks, repeating the step 505, and continuously grinding the contact surface of the spherical cushion block;
if the surface has no defects such as obvious pores or cracks, a red lead pressing method is used for detecting whether the contact surface of the spherical cushion block and the contact surface of the spherical cushion block are uniformly contacted and whether the contact area between the contact surface of the spherical cushion block and the contact surface of the spherical cushion block is more than 80 percent, namely the contact surface of the bearing support and the contact surface of the spherical cushion block are polished and then are pressed oppositely.
If the contact surface is uniformly contacted and the contact area is larger than 80%, the above-mentioned flow is ended.
If the contact surface contact is not uniform or the contact area is not greater than 80%, the step 505 is repeated to continue grinding the contact surface of the spherical pad.
It can be understood that the present embodiment does not limit the specific value of the contact area, and the specific value described is only one of the preferred solutions, which is not described in detail later.
The embodiment adopts the laser quenching method to process the contact surface of the spherical cushion block, thereby avoiding the occurrence of crack defects as much as possible, improving the wear resistance of the contact surface and further effectively reducing the wear of the spherical cushion block. Practice proves that the method can effectively inhibit fretting wear of the contact surface of the bearing support and the contact surface of the spherical cushion block, prolong the overhaul period and improve the overall safety of equipment.
Therefore, the problem of fretting wear between the bearing support and the spherical cushion block of the steam turbine is solved, and a treatment process and a surface treatment process are designed. The contact surface of the bearing support is processed by adopting a laser cladding method, and the contact surface of the spherical cushion block is processed by adopting a laser quenching method. Practice proves that the method can effectively inhibit fretting wear of the contact surfaces of the bearing support and the spherical cushion block, prolong the overhaul period and improve the overall safety of equipment. In addition, the bearing support is made of nodular cast iron, and the laser cladding mode is selected, so that the surface strength and the wear resistance are improved, and the advantage of the mechanical property of a nodular cast iron matrix is kept.
The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same.
Claims (10)
1. A method of treating fretting wear of a bearing, for treating a bearing support, the method comprising:
roughly machining the bearing support to enable the size of a contact surface of the bearing support to meet a first preset size and the size of the contact surface of the bearing support to meet a first surface roughness, wherein the first preset size comprises machining allowance of the contact surface of the bearing support;
Carrying out surface cleaning on the contact surface of the bearing support after rough machining so as to remove surface attachments of the contact surface of the bearing support;
performing finish machining on the contact surface of the bearing support after surface cleaning so that the ball diameter size of the contact surface of the bearing support meets a second preset size;
and polishing the contact surface of the bearing support after finish machining so as to enable the contact surface of the bearing support to reach a second surface roughness.
2. The method of managing bearing fretting wear according to claim 1, wherein prior to roughing the bearing support, the method comprises:
and processing the contact surface of the bearing support by adopting a laser cladding method.
3. The method of treating fretting wear in bearings of claim 1, wherein prior to surface cleaning the rough bearing bracket contact surface, the method further comprises:
and roughly machining the non-contact surface of the bearing support so that the size of the non-contact surface of the bearing support meets the third preset size.
4. The method of treating fretting wear of a bearing according to claim 1, wherein after polishing the finished bearing bracket contact surface, the method further comprises:
And carrying out contact inspection on the contact surface of the bearing support.
5. The method of claim 4, wherein the contact inspection of the bearing bracket contact surface comprises:
carrying out flaw detection on the contact surface of the bearing support to detect whether the contact surface of the bearing support has defects or not;
if the contact surface of the bearing support is not defective, detecting whether the contact uniformity or the contact area of the contact surface of the bearing support meets preset conditions by using a red lead pressing method;
if the contact uniformity and the contact area of the contact surface of the bearing support meet preset conditions, ending the processing flow;
and if the contact uniformity or the contact area of the contact surface of the bearing support does not meet the preset conditions, returning to the step of polishing the contact surface of the bearing support after finish machining.
6. A method of treating fretting wear of a bearing for treating a spherical pad, the method comprising:
roughly machining the spherical cushion block to enable the size of a contact surface of the spherical cushion block to meet a fourth preset size and the contact surface of the spherical cushion block to meet a third surface roughness, wherein the fourth preset size comprises machining allowance of the contact surface of the spherical cushion block;
Carrying out surface cleaning on the roughly machined spherical cushion block contact surface to remove surface attachments of the spherical cushion block contact surface;
performing finish machining on the contact surface of the spherical cushion block subjected to surface cleaning to enable the spherical diameter size of the contact surface of the spherical cushion block to meet a fifth preset size;
and polishing the contact surface of the spherical cushion block after finish machining so as to enable the contact surface of the spherical cushion block to reach a fourth surface roughness.
7. The method of managing bearing fretting wear of claim 6, wherein prior to roughing the spherical pad, the method further comprises:
and processing the contact surface of the spherical cushion block by adopting a laser quenching method.
8. The method of claim 6, wherein prior to surface cleaning the roughened spherical pad contacting surface, the method further comprises:
and roughly machining the non-contact surface of the spherical cushion block so that the size of the non-contact surface of the spherical cushion block meets the sixth preset size.
9. The method of claim 6, wherein after polishing the finished spherical pad contact surface, the method further comprises:
And carrying out contact inspection on the contact surface of the spherical cushion block.
10. The method for treating bearing fretting wear according to claim 9, wherein the step of performing a contact check on the contact surface of the spherical pad comprises:
carrying out flaw detection on the contact surface of the spherical cushion block to detect whether the contact surface of the spherical cushion block has defects or not;
if the contact surface of the spherical cushion block has no defect, detecting whether the contact uniformity or the contact area of the contact surface of the spherical cushion block meets preset conditions by adopting a red lead pressing method;
if the contact uniformity and the contact area of the contact surface of the spherical cushion block meet the preset conditions, ending the processing flow;
and if the contact uniformity or the contact area of the contact surface of the spherical cushion block does not meet the preset condition, returning to the step of polishing the contact surface of the spherical cushion block after finish machining.
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| CN202210212557.6A CN114515936A (en) | 2022-03-04 | 2022-03-04 | Bearing fretting wear treatment method |
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|---|---|---|---|---|
| CN102031519A (en) * | 2011-01-12 | 2011-04-27 | 唐山瑞兆激光技术机械修复有限公司 | Laser repair method for abraded centrifugal fan bearing block |
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| JP2018172721A (en) * | 2017-03-31 | 2018-11-08 | Ntn株式会社 | Manufacturing method of mechanical part |
| CN112522480A (en) * | 2020-10-19 | 2021-03-19 | 珠海飞马传动机械有限公司 | Novel heat treatment process method for bearing quenching |
| CN113997011A (en) * | 2021-09-28 | 2022-02-01 | 华润电力湖北有限公司 | Method for inhibiting corrosion damage of elliptical bush bearing of steam turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102031519A (en) * | 2011-01-12 | 2011-04-27 | 唐山瑞兆激光技术机械修复有限公司 | Laser repair method for abraded centrifugal fan bearing block |
| JP2018172721A (en) * | 2017-03-31 | 2018-11-08 | Ntn株式会社 | Manufacturing method of mechanical part |
| CN107723700A (en) * | 2017-08-23 | 2018-02-23 | 韩传怀 | A kind of restorative procedure to run out bearing |
| CN112522480A (en) * | 2020-10-19 | 2021-03-19 | 珠海飞马传动机械有限公司 | Novel heat treatment process method for bearing quenching |
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