CN111593294A - High-performance shock absorber steel pipe and machining method thereof - Google Patents
High-performance shock absorber steel pipe and machining method thereof Download PDFInfo
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- 230000035939 shock Effects 0.000 title claims abstract description 74
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000003754 machining Methods 0.000 title description 6
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- 238000007254 oxidation reaction Methods 0.000 claims abstract description 23
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- 238000010622 cold drawing Methods 0.000 claims description 17
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- 239000012492 regenerant Substances 0.000 claims description 15
- 238000005096 rolling process Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
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- 238000003860 storage Methods 0.000 claims description 12
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- JOHZPMXAZQZXHR-UHFFFAOYSA-N pipemidic acid Chemical compound N1=C2N(CC)C=C(C(O)=O)C(=O)C2=CN=C1N1CCNCC1 JOHZPMXAZQZXHR-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/58—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions more than one element being applied in more than one step
-
- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/52—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions more than one element being applied in one step
Abstract
The invention relates to the technical field of shock absorber steel pipes, and provides a high-performance shock absorber steel pipe and a processing method thereof, wherein the high-performance shock absorber steel pipe comprises a low-carbon steel pipe; the diffusion layer is permeated on the surface of the low-carbon steel pipe, the white bright layer is permeated on the diffusion layer, and the oxidation film is permeated on the white bright layer. The invention overcomes the defects of the prior art, has reasonable design and compact structure, solves the problems of wear resistance, corrosion resistance and fatigue resistance of the prior damper steel pipe, is composed of a low-carbon steel pipe and a nitrogen-carbon-oxygen composite seeping layer through a simple process method, belongs to metallurgical bonding, and the nitrogen-carbon-oxygen composite seeping layer mainly comprises an oxide film with a spinel structure on the surface, a nitrogen-carbon compound layer and a diffusion layer.
Description
Technical Field
The invention relates to the technical field of shock absorber steel pipes, in particular to a high-performance shock absorber steel pipe and a machining method thereof.
Background
The shock absorber is a quick-wear part in the using process of an automobile, the working condition of the shock absorber affects the running stability and safety of the automobile, a shock absorber steel pipe (comprising a working cylinder and an oil storage cylinder) is an important part of the shock absorber, the quality of the steel pipe directly affects the use of the shock absorber, at present, most of the shock absorber steel pipe is made of low-carbon steel materials, and the processing method mainly comprises low-carbon steel pipe acid washing, cold drawing (finish rolling), pipe forming and cutting, surface rust prevention treatment or chromium plating treatment.
Along with market demands, the performance requirements on the steel pipe of the shock absorber are higher and higher, the performance of the common steel pipe of the shock absorber cannot meet the market demands, and the performance mainly refers to the corrosion resistance, the wear resistance and the fatigue resistance of the steel pipe.
The concrete points are as follows: 1. the surface hardness is low, the rigidity is insufficient, and the collision deformation is easy to occur during assembly or transportation. 2. The anticorrosive coating is easy to age or fall off under impact, and the function is failed due to rusting. 3. The service life is short, and the complex working condition environment cannot be dealt with.
Therefore, a high-performance shock absorber steel pipe and a machining method thereof are provided.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a high-performance shock absorber steel pipe and a processing method thereof, which overcome the defects of the prior art, have reasonable design and compact structure, and solve the problem of poor wear resistance and fatigue resistance of the existing shock absorber steel pipe.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
a high-performance shock absorber steel pipe and a processing method thereof are characterized by comprising a low-carbon steel pipe;
the diffusion layer is permeated on the surface of the low-carbon steel pipe, the bright white layer is permeated on the diffusion layer, and the oxidation film is permeated on the bright white layer.
Furthermore, a diffusion layer, a white bright layer and an oxide film are respectively infiltrated into the inner side and the outer side of the low-carbon steel pipe, the sum of the total thickness of the unilateral composite infiltration layer is 0.2-0.3 mm, and the thickness of the white bright layer is 12-20 um.
Further, the method comprises the following steps:
step one, cold drawing and finish rolling, namely, cold drawing the low-carbon steel pipe blank by a cold drawing machine and finish rolling by a finish rolling machine, and the low-carbon steel pipe with uniform thickness and size, stable surface and good smoothness can be obtained by the process.
And step two, forming cut pipes, and cutting the low-carbon steel pipes subjected to cold drawing and finish rolling in the step one through cutting equipment to obtain the low-carbon steel shock absorber steel pipes.
Step three, ultrasonic cleaning: putting the low-carbon steel damper steel pipe cut in the second step into a nitrogen-carbon-oxygen co-permeation tool, and carrying out ultrasonic cleaning to remove oil stains, wherein the cleaning water temperature is 50-60 ℃ and the cleaning time is 10-20 minutes;
step four, spray rinsing: carrying out circulating water pressurized spraying and rinsing on the low-carbon steel shock absorber steel pipe treated in the third step, wherein the spraying time is 5-10 minutes, and the rinsing time is 2-10 minutes;
step five, heating pretreatment: heating the low-carbon steel damper steel pipe treated in the fourth step for pretreatment, wherein the surface of the low-carbon steel damper steel pipe is heated to 360 +/-5 ℃ from normal temperature, the heating speed is 10-20 ℃/min, and the heat is preserved for 30-40 minutes;
sixthly, nitrocarburizing treatment: performing nitrocarburizing on the low-carbon steel damper steel pipe treated in the fifth step, adding a nitriding agent and a regenerating agent (the addition amount of the regenerating agent can accurately control the thickness of a composite carburized layer according to the weight of the low-carbon steel damper steel pipe), so as to obtain a white bright layer and a diffusion layer, wherein the co-carburizing temperature is 560-580 ℃, the co-carburizing time is 60-80 minutes, and the flow rate of dried compressed air is 0.1-0.3 MPa;
step seven, oxidation treatment: oxidizing the low-carbon steel damper steel pipe treated in the sixth step, adding an oxygen permeating agent, increasing the content of oxygen atoms on the surface of the low-carbon steel damper steel pipe matrix, forming an oxidation film, improving the corrosion potential, wherein the oxidation temperature is 420-440 ℃, and the oxidation time is 40-60 minutes;
step eight, impurity removal: cooling the low-carbon steel damper steel pipe treated in the step seven to normal temperature by using circulating water directly, and performing mechanical polishing to remove looseness and impurities;
step nine, distinguishing: and D, dividing the low-carbon steel shock absorber steel pipe processed in the step eight into two batches according to the technical requirements, the pipe wall thickness and the nitrogen-carbon-oxygen composite carburized layer depth, wherein one batch is a shock absorber working cylinder, and the other batch is a shock absorber oil storage cylinder.
Step ten, reoxidation: carrying out secondary pretreatment and oxygen permeation treatment on a batch of low-carbon steel damper steel pipes serving as the working cylinders of the dampers in the ninth step, and increasing the thickness of an oxide film and the depth of solid-solution oxygen atoms;
and step eleven, cleaning, spraying, drying, atomizing, coating oil and packaging the oil storage cylinder steel pipe processed in the step eight and the shock absorber working cylinder/shock absorber oil storage cylinder processed in the step ten.
Further, the formula of the nitriding agent comprises the following components in percentage by mass:
further, the regenerant formula comprises the following components in parts by mass:
further, the formula of the oxygen permeability agent comprises the following components in percentage by mass:
furthermore, the addition amount of the regenerant is 0.5-1.5% of the weight of each batch of the shock absorber steel pipe.
Furthermore, in the second step, a co-infiltration micro-deformation size needs to be reserved when the low-carbon steel pipe is cut, and the pre-deformation amount is 0.02-0.04 mm.
(III) advantageous effects
The embodiment of the invention provides a high-performance shock absorber steel pipe and a machining method thereof. The method has the following beneficial effects:
1. the invention provides a high-performance damper steel pipe which is composed of a low-carbon steel pipe and a nitrogen-carbon-oxygen composite permeable layer, belongs to metallurgical bonding, and mainly comprises a surface spinel structure (spinel structure Fe3O4) oxide film, a nitrogen-carbon compound layer and a diffusion layer.
2. The high-performance shock absorber steel pipe provided by the invention does not need passivation, rust prevention and surface chromium plating treatment any more, does not contain acid pickling passivation or chromium plating heavy metal pollution which pollutes the environment in the production process, and does not cause secondary heavy metal pollution in the use process.
3. The composite layer of the steel pipe material is a permeable layer, the peeling phenomenon and the peeling phenomenon cannot be generated, the composite permeable layer is uniform, the thickness of the damper steel is the same, the surface hardness of the damper steel is larger than 550HV, the thickness of the composite permeable layer is unilateral, the range can reach 0.2-0.3 mm, the corrosion resistance of a neutral salt spray test is over 144 hours, and the tensile strength of the damper steel pipe is improved by over 100MPa compared with that of a common damper steel pipe.
4. The surface treatment process can accurately control the quality of the seeping layer of the steel tube of the shock absorber, the addition amount of the regenerant is 0.5-1.5% of the weight of a workpiece for the steel tube of the shock absorber within a certain temperature range (560-580 ℃), the flow rate of the regenerant is 0.1-0.3 MPa by matching with the introduction of dried compressed air, and the white and bright layer of the surface seeping layer of the steel tube of the shock absorber, the total seeping layer is 0.20-0.30 mm, and the surface hardness is 500-650 Hv0.1, can be obtained.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
In the figure: low-carbon steel pipe 1, diffusion layer 2, bright layer 3, oxide film 4.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
The invention discloses a high-performance shock absorber steel pipe and a processing method thereof, and the high-performance shock absorber steel pipe and the processing method thereof are characterized by comprising a shock absorber low-carbon steel pipe 1 and other low-carbon alloy steel materials such as Q235D, 20 steel, 20Mn2 and the like, and the processing method is adopted: the nitrogen-carbon-oxygen co-permeation surface treatment process is used for manufacturing the high-performance shock absorber composite steel pipe similar to the composite steel pipe;
the low carbon steel pipe 1 is gone up to ooze and is had diffusion barrier 2, can improve bumper shock absorber steel pipe fatigue strength, it has bright layer 3 to ooze on diffusion barrier 2, bright layer 3 can the bumper shock absorber steel pipe improve hardness, wearability and corrosion resistance, bright layer 3 upper bag is oozed and is had oxide film 4, the composition spinel structure (Fe3O4) of oxide film 4, the purpose is to increase workpiece surface oxygen atom content and form oxide film 4, improve the corrosion potential, ooze the layer simultaneously stably, be difficult for the desquamation, and service life is prolonged.
In the embodiment, as shown in fig. 1, the sum of the thicknesses of the diffusion layer 2, the bright white layer 3 and the oxide film 4 on the surface of the low-carbon steel pipe 1 is 0.2-0.3 mm, the composite layer of the steel pipe material of the invention is a seeping layer, the peeling phenomenon and the peeling phenomenon are not generated, the composite seeping layer is uniform, the roundness is not changed, the surface hardness is greater than 550HV, the thickness of the composite seeping layer is a single-side range and can reach 0.2-0.3 mm, the corrosion resistance of a neutral salt spray test is over 144 hours, and the tensile strength of the steel pipe is improved by over 100Mpa compared with that of a common shock absorber steel pipe.
In this embodiment, a method for processing a high-performance shock absorber steel pipe includes the following steps:
step one, cold drawing finish rolling, namely, carrying out cold drawing finish rolling on the low-carbon steel billet by a cold drawing machine, and obtaining the low-carbon steel pipe with uniform thickness and size and good surface smoothness by the process.
And step two, forming a cut pipe, cutting the low-carbon steel pipe subjected to cold drawing and finish rolling in the step one through cutting equipment, reserving the micro-deformation size during co-permeation when the low-carbon steel pipe is cut, obtaining the low-carbon steel damper steel pipe, and reserving the deformation size and improving the precision due to the influence of the temperature and the permeation layer thickness generated during co-permeation when the low-carbon steel damper steel pipe is subjected to nitrogen carbon oxygen co-permeation so as to ensure the precision of the co-permeation of the low-carbon steel damper steel pipe, wherein the deformation reservation is 0.02-0.04 mm.
Step three, ultrasonic cleaning: putting the low-carbon steel damper steel pipe obtained in the second step into a nitrogen-carbon-oxygen co-permeation tool, and carrying out ultrasonic cleaning to remove oil stains, wherein the cleaning water temperature is 50-60 ℃, and the cleaning time is 10-20 minutes, so that oil stains and impurities attached to the workpiece are effectively removed, the follow-up steps are not influenced by the impurities, and the follow-up steps are also important steps influencing the appearance of the mass-produced product;
step four, spray rinsing: the low-carbon steel shock absorber steel pipe treated in the third step is subjected to circulating water pressurized spraying and rinsing, the spraying time is 5-10 minutes, the rinsing time is 2-10 minutes, the workpiece can be effectively cleaned by adopting a circulating water pressurized spraying mode, the water consumption is greatly reduced, the production cost is reduced, the circulating water treatment cost is also reduced, and the effect on the product is consistent with the purpose of the first step;
step five, heating pretreatment: heating the low-carbon steel damper steel pipe processed in the fourth step to be pretreated, wherein the surface of the low-carbon steel damper steel pipe is heated to 360 +/-5 ℃ from normal temperature, the heating speed is 10-20 ℃/min, the heat is preserved for 30-40 minutes, the workpiece is ensured to be gradually heated to 380 ℃ from the normal temperature, the thermal deformation is reduced, and the heat is preserved at 380 ℃ because the working cylinder is made of a low-carbon material and is a thin-walled part, and under the condition of the equipment in the process, the phenomenon that the penetration layer is loosened due to the fact that the temperature is too high and is easy to blacken easily is caused; the temperature is too low, which is not beneficial to the surface activation of the workpiece and influences the co-permeation quality;
sixthly, nitrocarburizing treatment: carrying out nitrogen-carbon-oxygen co-cementation on the low-carbon steel shock absorber steel pipe treated in the fifth step, adding a nitriding agent and a regenerating agent to obtain a white bright layer 3 and a diffusion layer 2, wherein the co-cementation temperature is 560-580 ℃, the co-cementation time is 60-80 minutes, the best special effect of the composite penetrating agent can be exerted by treatment at the temperature, the co-cementation time is greatly shortened, and the flow rate is 0.1-0.3 MPa by virtue of dried compressed air;
step seven, oxidation treatment: oxidizing the low-carbon steel damper steel pipe treated in the sixth step, adding an oxygen permeating agent, increasing the content of oxygen atoms on the surface of a white layer 3 and a diffusion layer 2 of the low-carbon steel damper steel pipe, forming an oxidation film 4, improving the corrosion potential, wherein the oxidation temperature is 420-440 ℃, the oxidation time is 40-60 minutes, according to the characteristics of the oxygen permeating agent, the melting point and the optimal oxidation temperature of each oxygen permeating agent are determined according to the types and components of raw materials of the oxygen permeating agent, the higher the temperature is, the stronger the oxidability is, but the high temperature is easy to damage the stability of the oxygen permeating agent, performing oxidation reaction after the seventh step to obtain a compact oxidation film 4 (spinel structure Fe3O4), a white layer 3(Fe 2-3N) and a nitrogen-carbon-oxygen solid solution layer, wherein the co-permeation layer is uniform, stable in structure, free of cracking, free of catalyst catalysis, and capable of oxidizing harmful substances of the nitrogen permeating agent within 15-20 minutes, the production efficiency is improved and the environment is not polluted;
step eight, impurity removal: cooling the low-carbon steel shock absorber steel pipe treated in the step seven to normal temperature by using circulating water directly, and performing shock polishing to remove looseness and impurities;
step nine, distinguishing: and D, dividing the low-carbon steel shock absorber steel pipe processed in the step eight into two batches according to the technical requirements, the pipe wall thickness and the infiltration layer thickness, wherein one batch is used as a shock absorber working cylinder, and the other batch is used as a shock absorber oil storage cylinder.
Step ten, reoxidation: pretreating and secondarily oxidizing a batch of low-carbon steel damper steel pipes serving as a damper working cylinder, and adding an oxygen permeating agent again to increase the depth of an oxidation film and a solid-solution oxygen atom;
and step eleven, cleaning, spraying, drying, atomizing, oiling and boxing the shock absorber working cylinder/shock absorber oil storage cylinder processed in the step eight and the step ten, saving labor cost, reducing consumption of consumables and improving the cleanliness of the shock absorber steel pipe.
In the embodiment, the nitriding agent mainly provides elements for nitrocarburizing and carbonitriding to permeate into a matrix, so as to form a compound and a solid solution, so that a workpiece has wear resistance and fatigue resistance and basic corrosion resistance, and the formula of the nitriding agent comprises the following components in percentage by mass:
in the embodiment, the regenerant is a regulator which is mainly used for regulating the activity and stability of the base agent and reducing harmful substances of the base agent, and the formula of the regenerant comprises the following components in percentage by mass:
in the embodiment, the oxygen permeating agent is an auxiliary agent and mainly provides oxygen elements, a face-centered cubic compact ferroferric oxide film and oxygen atoms are formed on a nitrocarbon compound layer for solid solution, the friction coefficient of the surface of a workpiece is reduced, the corrosion potential of the surface of a composite layer is improved, the oxygen content is increased, and the corrosion resistance is improved, and the oxygen permeating agent is prepared from the following components in percentage by mass:
in the embodiment, the addition amount of the regenerant is 1-2% of the weight of the oil storage cylinder of the shock absorber in each batch of treatment, the control precision of the bright layer can reach 1-3 um/10min and the control precision of the total infiltrated layer can reach 5-15 um/10min by controlling the addition amount of the regenerant, and meanwhile, the dry compressed air is adopted in a matching manner, the flow rate is 0.1-0.3 MPa, so that the bright layer 12-20 um, the total infiltrated layer 0.20-0.30 mm and the surface hardness is 500-650 Hv0.1.
Example 1
The machining method of the high-performance shock absorber steel pipe comprises the following steps:
step one, cold drawing finish rolling, namely, finish rolling the low-carbon steel pipe blank by a cold drawing machine through a cold drawing finishing mill, and obtaining the low-carbon steel pipe with uniform thickness and size and good surface smoothness through the process.
And step two, forming a cut pipe, cutting the low-carbon steel pipe subjected to cold drawing and finish rolling in the step one through cutting equipment, reserving the micro-deformation size during co-cementation when the low-carbon steel pipe is cut to obtain the low-carbon steel pipe 1 of the shock absorber, and reserving the deformation size to ensure the co-cementation precision of the low-carbon steel pipe 1 due to the influence of the temperature generated by the co-cementation and the thickness of a cementation layer when the low-carbon steel pipe 1 is subjected to nitrocarburizing, so that the precision is improved, and the deformation reservation quantity is 0.02-0.04 mm.
Step three, ultrasonic cleaning: the low-carbon steel pipe 1 is put into a nitrogen-carbon-oxygen co-permeation tool, the weight of the furnace is 200KG, ultrasonic cleaning is carried out to remove oil stains, the water temperature for cleaning is 55 ℃, and the time is 10 minutes;
step four, spray rinsing: pressurizing, spraying and rinsing the recirculated water after the treatment in the step three, wherein the spraying time is 5 minutes, and the rinsing time is 2 minutes;
step five, heating pretreatment: pretreating the damper steel pipe treated in the fourth step, heating the surface of the workpiece to 360 +/-5 ℃ from normal temperature, wherein the heating speed is 20 ℃/min, and keeping the temperature for 40 minutes;
sixthly, nitrocarburizing treatment: performing nitrogen-carbon-oxygen co-permeation on the shock absorber steel pipe treated in the fifth step to obtain a white bright layer 3 and a diffusion layer 2; the co-permeation temperature is 560 ℃, the addition amount of the regenerant is 1kg, the co-permeation time is 60 minutes, the flow rate of the dried compressed air is 0.1MPa,
step seven, oxidation treatment: oxidizing the workpiece treated in the step six, and adding an oxidizing agent; the oxidation temperature is 430 ℃, and the oxidation time is 40 minutes;
step eight, impurity removal: cooling the workpiece treated in the step seven to normal temperature by using circulating water directly, and performing vibration polishing to remove looseness and impurities; the grinding materials are high-alumina porcelain cylinders and balls with the diameter of 2mm, and the vibration polishing time is 10 minutes;
step nine, distinguishing: and (4) dividing the low-carbon steel pipe 1 treated in the step eight into two batches according to the technical requirements of the pipe wall thickness and the permeable layer thickness, wherein one batch is used as a working cylinder of the shock absorber, and the other batch is used as an oil storage cylinder of the shock absorber.
Step ten, reoxidation: pretreating and secondarily oxidizing a batch of low-carbon steel pipes 1 serving as working cylinders of the shock absorbers, adding an oxygen permeating agent again, and repairing damaged oxidation films and the depth of solid-dissolved oxygen atoms;
and step eleven, cleaning, spraying, drying, atomizing, oiling and packaging the low-carbon steel pipe 1 treated in the step eight and the step ten, saving labor cost, reducing consumption of consumables and improving the cleanliness of the shock absorber steel pipe.
Example 2
The difference from the example 1 is that the loading weight of the damper steel storage tube is 300KG, the addition amount of the regenerant is 1KG, the co-cementation temperature is 570 ℃, and the operation data of the other steps are the same.
Comparative example 1
The difference from example 1 is that the amount of the regenerant added is 1.5kg, the temperature of the co-permeation is 560 ℃, and the operational data of the other steps are the same.
Comparative example 2
The difference from the example 1 is that the loading weight of the damper steel tube is 300Kg, the addition amount of the regenerant is 1.5Kg, the co-cementation temperature is 570 ℃, and the operation data of the other steps are the same.
And (3) performance detection results:
according to different proportions of the charging weight of the workpiece and the addition amount of the regenerant, the damper steel pipe has different performances;
the results of the different properties of the damper steel pipe according to the different co-cementation temperatures are shown in the following table.
Salt spray test: the corrosion resistance of the workpiece can be detected.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A high-performance shock absorber steel pipe and a processing method thereof are characterized by comprising a low-carbon steel pipe;
the method is characterized in that: the diffusion layer is permeated on the surface of the low-carbon steel pipe, the bright white layer is permeated on the diffusion layer, and the oxidation film is permeated on the bright white layer.
2. The steel pipe for a high-performance shock absorber and the manufacturing method thereof according to claim 1, wherein: and the diffusion layer, the white layer and the oxide film are respectively infiltrated into the inner side and the outer side of the low-carbon steel pipe, the sum of the total thickness of the unilateral composite infiltrated layer is between 0.2 and 0.3mm, and the thickness of the white layer is between 12 and 20 microns.
3. A method for processing a steel pipe for a high-performance shock absorber according to claims 1-2, comprising the steps of:
step one, cold drawing and finish rolling, namely, cold drawing the low-carbon steel pipe blank by a cold drawing machine and finish rolling by a finish rolling machine, and the low-carbon steel pipe with uniform thickness and size, stable surface and good smoothness can be obtained by the process.
And step two, forming cut pipes, and cutting the low-carbon steel pipes subjected to cold drawing and finish rolling in the step one through cutting equipment to obtain the low-carbon steel shock absorber steel pipes.
Step three, ultrasonic cleaning: putting the low-carbon steel damper steel pipe cut in the second step into a nitrogen-carbon-oxygen co-permeation tool, and carrying out ultrasonic cleaning to remove oil stains, wherein the cleaning water temperature is 50-60 ℃ and the cleaning time is 10-20 minutes;
step four, spray rinsing: carrying out circulating water pressurized spraying and rinsing on the low-carbon steel shock absorber steel pipe treated in the third step, wherein the spraying time is 5-10 minutes, and the rinsing time is 2-10 minutes;
step five, heating pretreatment: heating the low-carbon steel damper steel pipe treated in the fourth step for pretreatment, wherein the surface of the low-carbon steel damper steel pipe is heated to 360 +/-5 ℃ from normal temperature, the heating speed is 10-20 ℃/min, and the heat is preserved for 30-40 minutes;
sixthly, nitrocarburizing treatment: carrying out nitrogen-carbon-oxygen co-cementation on the low-carbon steel damper steel pipe treated in the fifth step, adding a nitriding agent and a regenerating agent to obtain a white bright layer and a diffusion layer, wherein the co-cementation temperature is 560-580 ℃, the co-cementation time is 60-80 minutes, and introducing dried compressed air, and the flow rate is 0.1-0.3 MPa;
step seven, oxidation treatment: oxidizing the low-carbon steel damper steel pipe treated in the sixth step, adding an oxygen permeating agent, increasing the content of oxygen atoms on the surface of the low-carbon steel damper steel pipe matrix, forming an oxidation film, improving the corrosion potential, wherein the oxidation temperature is 420-440 ℃, and the oxidation time is 40-60 minutes;
step eight, impurity removal: cooling the low-carbon steel damper steel pipe treated in the step seven to normal temperature by using circulating water directly, and performing mechanical polishing to remove looseness and impurities;
step nine, distinguishing: and D, dividing the low-carbon steel shock absorber steel pipe processed in the step eight into two batches according to the technical requirements, the pipe wall thickness and the nitrogen-carbon-oxygen composite carburized layer depth, wherein one batch is a shock absorber working cylinder, and the other batch is a shock absorber oil storage cylinder.
Step ten, reoxidation: carrying out secondary pretreatment and oxygen permeation treatment on a batch of low-carbon steel damper steel pipes serving as the working cylinders of the dampers in the ninth step, and increasing the thickness of an oxide film and the depth of solid-solution oxygen atoms;
and step eleven, cleaning, spraying, drying, atomizing, coating oil and packaging the oil storage cylinder steel pipe processed in the step eight and the shock absorber working cylinder/shock absorber oil storage cylinder processed in the step ten.
4. The method for processing the steel pipe of the high-performance shock absorber according to claim 3, wherein: the formula of the nitriding agent comprises the following components in percentage by mass:
5. the method for processing the steel pipe of the high-performance shock absorber according to claim 3, wherein: the regenerant formula comprises the following components in parts by mass:
6. the method for processing the steel pipe of the high-performance shock absorber according to claim 3, wherein: the formula of the oxygen permeating agent comprises the following components in percentage by mass:
7. the method for processing the steel pipe of the high-performance shock absorber according to claim 3, wherein: the addition amount of the regenerant is 0.5-1.5% of the weight of each batch of the shock absorber steel pipe.
8. The method for processing the steel pipe of the high-performance shock absorber according to claim 3, wherein: and in the second step, the co-cementation micro-deformation size needs to be reserved when the low-carbon steel pipe is cut, and the pre-deformation amount is 0.02-0.04 mm.
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