CN114293135B - Oxynitriding composite strengthening treatment process for gas surface of piston rod of automobile shock absorber - Google Patents
Oxynitriding composite strengthening treatment process for gas surface of piston rod of automobile shock absorber Download PDFInfo
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- CN114293135B CN114293135B CN202110491451.XA CN202110491451A CN114293135B CN 114293135 B CN114293135 B CN 114293135B CN 202110491451 A CN202110491451 A CN 202110491451A CN 114293135 B CN114293135 B CN 114293135B
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 66
- 230000035939 shock Effects 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000002131 composite material Substances 0.000 title claims abstract description 19
- 238000005728 strengthening Methods 0.000 title claims abstract description 19
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 172
- 238000001816 cooling Methods 0.000 claims abstract description 87
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 86
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 86
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 86
- 238000010438 heat treatment Methods 0.000 claims abstract description 60
- 238000005121 nitriding Methods 0.000 claims abstract description 55
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 43
- 238000004140 cleaning Methods 0.000 claims abstract description 21
- 238000007599 discharging Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 230000001590 oxidative effect Effects 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 89
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 229910021529 ammonia Inorganic materials 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 36
- 230000003647 oxidation Effects 0.000 description 19
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 6
- 239000011651 chromium Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
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Abstract
The application discloses an oxynitriding composite strengthening treatment process for the gas surface of a piston rod of an automobile shock absorber, which comprises the following steps: the method comprises the steps of cleaning and deoiling a piston rod of an automobile shock absorber, placing the deoiled piston rod of the automobile shock absorber in a furnace, sealing, heating, introducing water vapor, pre-oxidizing, heating again, introducing ammonia and carbon dioxide, nitriding for the first time, cooling, introducing ammonia and carbon dioxide again, nitriding for the second time, cooling again, introducing water vapor, performing post-oxidation treatment, cooling the piston rod of the automobile shock absorber along with the furnace, and discharging the piston rod of the automobile shock absorber from the furnace for natural cooling. The application provides a method for processing a piston rod of an automobile shock absorber, which has the effects of improving mechanical properties, friction performance and corrosion resistance for the piston rod of the automobile shock absorber.
Description
Technical Field
The application relates to the technical field of automobile part manufacturing, in particular to an oxynitriding composite strengthening treatment process for the gas surface of a piston rod of an automobile shock absorber.
Background
The piston rod works in a sliding friction environment for a long time, and has certain requirements on the surface wear resistance. In the traditional chromium electroplating treatment, because the hardness gradient of a chromium layer and a matrix is large, after the chromium layer is subjected to the action of abnormal impact load, the coating is subjected to crack expansion and abrasive particle abrasion failure, so that oil leakage phenomenon is generated at a sealing part, early failure is generated, and related technical improvements such as a process or materials for strengthening the automobile shock absorber are urgently needed.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.
The present application has been made in view of the above-mentioned and/or existing problems occurring in the piston rod products of the prior art automotive shock absorbers.
Therefore, one of the purposes of the application is to overcome the defects of the existing automobile shock absorber piston rod products and provide an oxynitriding composite strengthening treatment process for the gas surface of the automobile shock absorber piston rod.
In order to solve the technical problems, according to one aspect of the present application, the following technical solutions are provided: an oxynitriding composite strengthening treatment process for the gas surface of a piston rod of an automobile shock absorber comprises the following steps: the method comprises the steps of cleaning and deoiling a piston rod of an automobile shock absorber, placing the deoiled piston rod of the automobile shock absorber in a furnace, sealing, heating, introducing water vapor, pre-oxidizing, heating again, introducing ammonia and carbon dioxide, nitriding for the first time, cooling, introducing ammonia and carbon dioxide again, nitriding for the second time, cooling again, introducing water vapor, performing post-oxidation treatment, cooling the piston rod of the automobile shock absorber along with the furnace, and discharging the piston rod of the automobile shock absorber from the furnace for natural cooling.
As a preferable scheme of the oxynitriding composite strengthening treatment process for the gas surface of the piston rod of the automobile shock absorber, the application comprises the following steps: the automobile shock absorber piston rod obtained by tapping and naturally cooling the automobile shock absorber piston rod comprises an effective nitriding layer of 340 mu m.
As a preferable scheme of the oxynitriding composite strengthening treatment process for the gas surface of the piston rod of the automobile shock absorber, the application comprises the following steps: the temperature was raised to 400 ℃.
As a preferable scheme of the oxynitriding composite strengthening treatment process for the gas surface of the piston rod of the automobile shock absorber, the application comprises the following steps: then the temperature is raised to 600 ℃.
As a preferable scheme of the oxynitriding composite strengthening treatment process for the gas surface of the piston rod of the automobile shock absorber, the application comprises the following steps: the nitriding treatment time is 210min.
As a preferable scheme of the oxynitriding composite strengthening treatment process for the gas surface of the piston rod of the automobile shock absorber, the application comprises the following steps: the second nitriding treatment time is 90min.
As a preferable scheme of the oxynitriding composite strengthening treatment process for the gas surface of the piston rod of the automobile shock absorber, the application comprises the following steps: the temperature was reduced to 565 ℃.
As a preferable scheme of the oxynitriding composite strengthening treatment process for the gas surface of the piston rod of the automobile shock absorber, the application comprises the following steps: then cooling to 500 ℃.
As a preferable scheme of the oxynitriding composite strengthening treatment process for the gas surface of the piston rod of the automobile shock absorber, the application comprises the following steps: the post-oxidation treatment time was 130min.
As a preferable scheme of the oxynitriding composite strengthening treatment process for the gas surface of the piston rod of the automobile shock absorber, the application comprises the following steps: and introducing nitrogen and carbon dioxide, wherein the flow ratio of the nitrogen to the carbon dioxide is 95:5.
As a preferable scheme of the oxynitriding composite strengthening treatment process for the gas surface of the piston rod of the automobile shock absorber, the application comprises the following steps: and then introducing nitrogen and carbon dioxide, wherein the flow ratio of the nitrogen to the carbon dioxide is 95:5.
The application provides a method for processing a piston rod of an automobile shock absorber, which has the effects of improving mechanical properties, friction performance and corrosion resistance for the piston rod of the automobile shock absorber.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is hardness and surface depth data for a finished automotive shock absorber piston rod manufactured in example 1.
Fig. 2 shows the wear rate of the finished piston rod of the automobile shock absorber after the processing of example 1.
Fig. 3 is a diagram of an apparatus used in the present application.
FIG. 4 is a graph showing the temperature and time variation of the present application.
FIG. 5 is a flow chart of the treatment process of the present application.
FIG. 6 is a cross-sectional micro-topography after treatment according to the present application.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will become more apparent, a more particular description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 50min, heating to 600 ℃, introducing ammonia and carbon dioxide (flow ratio of 95:5) gas to enable the reaction chamber to be filled with ammonia and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 565 ℃, introducing ammonia and carbon dioxide (flow ratio of 97:3) gas to enable the reaction chamber to be filled with ammonia and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 2
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 350 ℃, then introducing steam, performing pre-oxidation treatment for 50min, heating to 600 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 565 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 3
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 60min, heating to 600 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 565 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 4
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 40min, heating to 600 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 565 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 5
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 50min, heating to 650 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 565 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 6
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 50min, heating to 550 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 200min, cooling to 565 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 7
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 200min, heating to 600 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 565 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 8
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 50min, heating to 600 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 220min, cooling to 565 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 9
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 50min, heating to 600 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 580 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 10
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 50min, heating to 600 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 550 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 11
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 50min, heating to 600 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 565 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 80min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 12
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 50min, heating to 600 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 565 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 100min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 13
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 50min, heating to 600 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 565 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 490 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 14
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 50min, heating to 600 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 565 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 510 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 15
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 50min, heating to 600 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 565 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 120min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 16
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 50min, heating to 600 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 565 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 140min, cooling to 120 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 17
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 50min, heating to 600 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 565 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 100 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 18
Selecting a finished product of a piston rod of an automobile shock absorber, cleaning and deoiling, placing the finished product on a furnace table, covering an inner cover and a heating cover thereof, heating to 400 ℃, then introducing steam, performing pre-oxidation treatment for 50min, heating to 600 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 95:5) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing primary nitriding treatment for 210min, cooling to 565 ℃, introducing ammonia gas and carbon dioxide gas (flow ratio of 97:3) to enable the reaction chamber to be filled with ammonia gas and carbon dioxide gas, performing secondary nitriding treatment for 90min, cooling to 500 ℃, introducing steam, performing post-oxidation treatment for 130min, cooling to 140 ℃ in the furnace, discharging, and naturally cooling to room temperature.
Example 19
The finished automobile damper piston rod manufactured in example 1 was measured to be higher than the hardness of the matrix using a section microscope, and the measured hardness numbers are shown in fig. 1.
As can be seen from FIG. 1, the effective nitriding layer was 50HV above the hardness of the substrate, which was measured to be 380HV 0.1 The effective permeation layer formed was measured to be 340 μm, and the decrease in hardness gradient from the outside to the inside was gentle.
The finished product of the piston rod of the automobile shock absorber processed in the example 1 is subjected to a reciprocating ball disc dry friction and wear test by using a UMT-2 friction and wear tester of Bruce, germany, a GCr15 alloy ball with the diameter of 5mm is selected as a grinding pair, the load is 10N, the sliding speed is 40mm/s, the unidirectional sliding friction stroke is 5mm, and the measured friction performance data are shown in figure 2.
The piston rod of the automobile shock absorber processed in example 1 had a higher friction performance, an average friction coefficient of 0.53 under a load of 10N, and a wear rate of 3.6X10 -3 mm 3 /(N.m). The electrochemical corrosion potential was-0.391 mv. Coefficient of friction wear rate of chromium plating under 10N load of 0.591, 3.6X10 corrosion potential -3 mm 3 /(N.m) and-471 mv. Therefore, the process product has better performance.
The composite process adopted in the application comprises pre-oxidation, primary nitriding treatment, secondary nitriding treatment and post-oxidation treatment, and total 480 minutes are needed to complete nitriding operation, the effective nitriding layer after nitriding operation is 340 mu m, and compared with the conventional technical scheme in the prior art, the method has the advantage that the treatment time is greatly shortened when the primary nitriding treatment is adopted for 340 mu m.
The automobile shock absorber piston rod is used as a starting material for treatment, and the automobile shock absorber piston rod has the advantage that a finished product obtained by direct processing is directly used without further processing in treatment, so that the automobile shock absorber piston rod is convenient to process and use.
The gas pre-oxidation-two-stage nitriding-post-oxidation technology used in the application is directly applied to the automobile piston rod in the three-stage processing technology of the automobile piston rod, has the advantage of longer service time compared with the piston rod with the surface chromium plating treatment on the market, and has six times of economic benefit compared with the surface chromium plating technology.
It should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application, which is intended to be covered in the scope of the claims of the present application.
Claims (2)
1. An oxynitriding composite strengthening treatment process for the gas surface of a piston rod of an automobile shock absorber is characterized by comprising the following steps of: comprising the steps of (a) a step of,
cleaning and deoiling a piston rod of the automobile shock absorber, placing the deoiled piston rod of the automobile shock absorber in a furnace, sealing, heating, introducing water vapor, pre-oxidizing, heating again, introducing ammonia gas and carbon dioxide, nitriding for the first time, cooling, introducing ammonia gas and carbon dioxide again, nitriding for the second time, cooling again, introducing water vapor, post-oxidizing, cooling the piston rod of the automobile shock absorber along with the furnace, and discharging the piston rod of the automobile shock absorber from the furnace for natural cooling;
wherein the temperature is raised to 400 ℃; the temperature is raised to 600 ℃; the two-stage nitriding treatment time is 90min; the temperature is reduced to 565 ℃; the temperature is reduced to 500 ℃; the nitriding treatment time is 210min; the post-oxidation treatment time is 130min, and the flow ratio of nitrogen to carbon dioxide is 95:5 after the nitrogen to the carbon dioxide are introduced; and introducing nitrogen and carbon dioxide, wherein the flow ratio of the nitrogen to the carbon dioxide is 97:3.
2. The process for oxynitriding composite strengthening treatment of the gas surface of a piston rod of an automobile shock absorber according to claim 1, wherein the process comprises the following steps of: and the automobile shock absorber piston rod obtained by tapping and naturally cooling the automobile shock absorber piston rod comprises an effective nitriding layer of 340 mu m.
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| CN202110491451.XA CN114293135B (en) | 2021-05-06 | 2021-05-06 | Oxynitriding composite strengthening treatment process for gas surface of piston rod of automobile shock absorber |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101851736A (en) * | 2010-02-09 | 2010-10-06 | 刘伟 | Environment-friendly nitrogen-enriched layer rapid nitriding treatment method |
| WO2013054997A1 (en) * | 2011-10-13 | 2013-04-18 | 중앙대학교 산학협력단 | Corrosion resistant metal and metal-surface modification method for improving corrosion resistance using oxynitriding |
| CN106756760A (en) * | 2017-01-17 | 2017-05-31 | 重庆长安汽车股份有限公司 | A kind of automobile brake disc wear resistant processing method |
| CN108950469A (en) * | 2018-07-12 | 2018-12-07 | 通富热处理(昆山)有限公司 | The nitrocarburizing of piston lever of reducer for automobile-oxidation composite treatment process |
| CN110423980A (en) * | 2019-08-01 | 2019-11-08 | 通富热处理(昆山)有限公司 | Raising brake disc is anti-corrosion and the composite treatment process of wear-resisting property |
| CN112725724A (en) * | 2020-12-28 | 2021-04-30 | 厦门真冈热处理有限公司 | Nitriding method of inner gear ring of automobile gearbox |
-
2021
- 2021-05-06 CN CN202110491451.XA patent/CN114293135B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101851736A (en) * | 2010-02-09 | 2010-10-06 | 刘伟 | Environment-friendly nitrogen-enriched layer rapid nitriding treatment method |
| WO2013054997A1 (en) * | 2011-10-13 | 2013-04-18 | 중앙대학교 산학협력단 | Corrosion resistant metal and metal-surface modification method for improving corrosion resistance using oxynitriding |
| CN106756760A (en) * | 2017-01-17 | 2017-05-31 | 重庆长安汽车股份有限公司 | A kind of automobile brake disc wear resistant processing method |
| CN108950469A (en) * | 2018-07-12 | 2018-12-07 | 通富热处理(昆山)有限公司 | The nitrocarburizing of piston lever of reducer for automobile-oxidation composite treatment process |
| CN110423980A (en) * | 2019-08-01 | 2019-11-08 | 通富热处理(昆山)有限公司 | Raising brake disc is anti-corrosion and the composite treatment process of wear-resisting property |
| CN112725724A (en) * | 2020-12-28 | 2021-04-30 | 厦门真冈热处理有限公司 | Nitriding method of inner gear ring of automobile gearbox |
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