CN117464327B - Method for prolonging fatigue life of hydrogen delivery pipe of 6061 aluminum alloy hydrogenation gun - Google Patents
Method for prolonging fatigue life of hydrogen delivery pipe of 6061 aluminum alloy hydrogenation gun Download PDFInfo
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- CN117464327B CN117464327B CN202311795254.2A CN202311795254A CN117464327B CN 117464327 B CN117464327 B CN 117464327B CN 202311795254 A CN202311795254 A CN 202311795254A CN 117464327 B CN117464327 B CN 117464327B
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- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 87
- 239000001257 hydrogen Substances 0.000 title claims abstract description 87
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 229910001094 6061 aluminium alloy Inorganic materials 0.000 title claims abstract description 28
- 238000005984 hydrogenation reaction Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005728 strengthening Methods 0.000 claims abstract description 18
- 230000003746 surface roughness Effects 0.000 claims abstract description 18
- 238000005553 drilling Methods 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims description 6
- 150000002431 hydrogen Chemical class 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000004807 localization Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
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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
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention aims to provide a method for prolonging the fatigue life of a 6061 aluminum alloy hydrogenation gun hydrogen delivery pipe, which belongs to the technical field of aluminum alloy part manufacturing, and the method adopts a deep hole drilling mode to drill holes in 6061 aluminum alloy bars, wherein the inner diameter of the drilled holes is 5.0-12.0% smaller than that of a finished product. Processing an inner hole of the hydrogen conveying pipe to a blank size by adopting a deep hole drill, and then carrying out driving excircle on the outer wall of the hydrogen conveying pipe to a finished product size, wherein the surface roughness of the inner hole is controlled to be 0.8-1.2 mu m; and (3) carrying out hydraulic strengthening treatment on the inner wall of the drilled aluminum alloy pipe, and finally reaming and honing to the size of a finished product. The method can improve the fatigue life of the hydrogen pipe of the 6061 aluminum alloy hydrogenation gun by 1.5-2 times, and reduce the production cost of the hydrogenation gun.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy part manufacturing, and particularly relates to a method for prolonging the fatigue life of a hydrogen delivery pipe of a 6061 aluminum alloy hydrogenation gun.
Background
In recent two years, the state ministry of China outsources a number of policies that strongly support the development of fuel cell automobiles. The development of the hydrogen energy fuel cell is not separated from the construction of infrastructure such as a hydrogen adding station, and the hydrogen adding device such as a hydrogen adding gun matched with the hydrogen adding station is required to be in the same quantity if the construction scale of the hydrogen adding station is huge in the future. At present, domestic 35 MPa hydrogenation equipment is gradually subjected to localization at present, and mass production is realized by individual enterprises; and 70MPa hydrogenation equipment is completely dependent on import, so that the research and development and localization of 70MPa hydrogenation guns are critical problems to be solved urgently.
The fatigue life of the hydrogen delivery pipe is critical to the service life of the 70MPa hydrogenation gun, so the selection of the hydrogen delivery pipe material is critical. At present, the hydrogen storage metal materials at home and abroad are usually materials with low hydrogen embrittlement sensitivity, such as Cr-Mo steel, 316L stainless steel, 6061 aluminum alloy and the like. However, in order to improve the one-hand operability of the hydrogenation gun, the material of the hydrogenation gun hydrogen delivery pipe is usually subjected to weight reduction by selecting 6061 aluminum alloy. However, 6061 aluminum alloy can affect the hydrogen delivery tube life due to lower strength and fatigue life compared to cr—mo steel and 316L stainless steel. The current preparation process of the hydrogen transmission pipe comprises drilling, reaming and honing, wherein the roughness value after drilling is 0.8-1.2 mu m, the roughness value after honing is reduced to 0.6-1.0 mu m, and the service life is also influenced by poor finish. Therefore, how to improve the fatigue life of 6061 aluminum alloy hydrogen delivery pipe is a technical problem to be solved.
Disclosure of Invention
The invention aims to provide a method for prolonging the fatigue life of a hydrogen delivery pipe of a 6061 aluminum alloy hydrogenation gun, so that the fatigue life of the hydrogen delivery pipe is prolonged, and the service life of the hydrogenation gun is prolonged.
The invention adopts the following technical scheme:
a method for improving fatigue life of a hydrogen delivery pipe of a 6061 aluminum alloy hydrogenation gun comprises the following steps:
firstly, drilling holes on 6061 aluminum alloy bars by adopting a deep hole drilling mode to obtain a hydrogen transmission pipe, turning the outer circle of the outer wall of the hydrogen transmission pipe to a specified outer diameter, wherein the inner diameter of a drilled blank is 5.0-12.0% smaller than the inner diameter of a finished product, and the surface roughness of an inner hole is controlled to be 0.8-1.2 mu m;
secondly, carrying out inner wall strengthening treatment on the hydrogen conveying pipe drilled in the first step, wherein the strengthening treatment is to clamp and seal two ends of the hydrogen conveying pipe, insert a core rod with a hole into the hydrogen conveying pipe, then apply hydraulic pressure to the inner wall of the hydrogen conveying pipe through the core rod for strengthening, and the surface roughness of an inner hole after strengthening is 0.4-0.8 mu m;
and thirdly, reaming the hydrogen delivery pipe with the reinforced inner wall in the second step, wherein the inner diameter of the reamed hydrogen delivery pipe is 0.5-1% smaller than the inner diameter of a finished product, honing the reamed hydrogen delivery pipe to the inner diameter of the finished product, and the surface roughness of the honed inner hole is not more than 0.4 mu m.
In the first step, the outer diameter of the 6061 aluminum alloy bar is 14-22 mm.
The inner diameter of the finished product in the first step is 4-8mm.
When the inner diameter of the finished product is 4-6mm in the first step, the inner diameter of a drilled blank is 8.0-12.0% smaller than the inner diameter of the finished product; and in the first step, when the inner diameter of the finished product is 6-8mm, the inner diameter of a blank of the drilled hole is 5.0-8.0% smaller than the inner diameter of the finished product.
And in the first step, when the inner diameter of the finished product is 4-6mm, applying hydraulic pressure to the inner wall of the hydrogen delivery pipe by using a hollow core rod for strengthening, wherein the hydraulic pressure is 260-290 MPa.
And in the first step, when the inner diameter of the finished product is 6-8mm, hydraulic pressure is applied to the inner wall of the hydrogen delivery pipe by using a hollow core rod for strengthening, wherein the hydraulic pressure is 230-260 MPa.
And in the third step, the surface roughness of the inner hole after honing is 0.2-0.4 mu m.
According to the invention, different hydraulic pressures are selected to strengthen the inner hole according to the size of the designed aperture, so that certain residual compressive stress can be formed on the inner walls of different apertures, and the fatigue life of the part with the hole is prolonged.
The beneficial effects of the invention are as follows:
the invention provides a method for prolonging the fatigue life of a hydrogen delivery pipe of a 6061 aluminum alloy hydrogenation gun. The method of the invention is that the roughness of the inner wall of the deep hole drill of the hydrogen delivery pipe is controlled within the range of 0.8-1.2 mu m, then the inner hole of the hydrogen delivery pipe is prestressed by a hydraulic mode, so that the inner wall is plastically deformed while the outer wall still keeps certain elastic deformation, and the inner wall keeps prestress (residual compressive stress) after unloading, thereby improving the bearing capacity of the hydrogen delivery pipe and further improving the fatigue performance of the pipe fitting. The strength of the matrix 6061 aluminum alloy of the hydrogen delivery pipe is gradually reduced from the inner wall to the outer wall after the prestress loading, so that an outer-toughness inner-strength gradient structure is formed, and the safety of the hydrogen delivery pipe can be improved. After the inner wall is prestressed and loaded, the surface morphology of the material is changed and strain hardening is carried out, the roughness value is reduced from 0.8-1.2 mu m to 0.4-0.8 mu m, then the finished product size is obtained through reaming and honing, meanwhile, the roughness value is reduced to 0.2-0.4 mu m, and the fatigue performance of the hydrogen transmission pipe is improved through roughness improvement. In conclusion, the fatigue performance of the hydrogen delivery pipe is synergistically improved by forming residual compressive stress, constructing the external tough internal strong tissue and improving the roughness of the inner hole, the service life of the hydrogenation gun is prolonged, and the use cost is reduced.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The method of the present invention will be described in further detail with reference to specific examples. It is to be understood that the following examples are illustrative only and are not to be construed as limiting the scope of the invention. All techniques implemented based on the above description of the invention are intended to be included within the scope of the invention.
The experimental methods used in the following examples are all conventional methods unless otherwise specified; the reagents, materials, etc. used in the examples described below are commercially available unless otherwise specified.
Example 1
The diameter of the inner hole finished product of the hydrogen conveying pipe is 8mm, and the preparation method comprises the following steps:
(1) Deep hole drill
Drilling the 6061 aluminum alloy bar, wherein the inner diameter size of the drilled hole is 5.0% smaller than the size of the finished product, and the surface roughness of the inner hole is 0.8 mu m;
(2) Inner hole reinforcement
And (3) applying hydraulic pressure to the inner wall of the hydrogen delivery pipe by using the hollow core rod for strengthening, wherein the hydraulic pressure is 230MPa.
(3) Reaming and honing
And (3) reaming the reinforced hydrogen conveying pipe, wherein the reaming size is 0.5% smaller than the finished product size, and honing the reinforced hydrogen conveying pipe to the finished product size.
Comparative example 1
The diameter of the inner hole finished product of the hydrogen conveying pipe is 8mm, and the preparation method comprises the following steps:
(1) And (3) drilling the 6061 aluminum alloy bar, wherein the inner diameter size of the drilled hole is 1.0% smaller than the size of the finished product, and the surface roughness of the inner hole is 0.8 mu m.
(2) Reaming and honing
And reaming the drilled hydrogen conveying pipe, wherein the reaming size is 0.5% smaller than the finished product size, and honing the drilled hydrogen conveying pipe to the finished product size.
Example 2
The diameter of the inner hole finished product of the hydrogen conveying pipe is 8mm, and the preparation method comprises the following steps:
(1) Deep hole drill
Drilling the 6061 aluminum alloy bar, wherein the inner diameter size of the drilled hole is 8.0% smaller than the size of the finished product, and the surface roughness of the inner hole is 1.2 mu m;
(2) Inner hole reinforcement
And (3) applying hydraulic pressure to the inner wall of the hydrogen conveying pipe by using the hollow core rod for strengthening, wherein the hydraulic pressure is 250MPa.
(3) Reaming and honing
And (3) reaming the reinforced hydrogen conveying pipe, wherein the reaming size is 1.0% smaller than the finished product size, and honing the reinforced hydrogen conveying pipe to the finished product size.
Comparative example 2
The diameter of the inner hole finished product of the hydrogen conveying pipe is 8mm, and the preparation method comprises the following steps:
(1) And (3) drilling the 6061 aluminum alloy bar, wherein the inner diameter size of the drilled hole is 1.5% smaller than the size of the finished product, and the surface roughness of the inner hole is 1.2 mu m.
(2) Reaming and honing
And reaming the drilled hydrogen conveying pipe, wherein the reaming size is 1.0% smaller than the finished product size, and honing the drilled hydrogen conveying pipe to the finished product size.
Example 3
The diameter of the inner hole finished product of the hydrogen conveying pipe is 4mm, and the preparation method comprises the following steps:
(1) Deep hole drill
And (3) drilling the 6061 aluminum alloy bar, wherein the inner diameter size of the drilled hole is 8.0% smaller than the size of the finished product, and the surface roughness of the inner hole is 0.8 mu m.
(2) Inner hole reinforcement
And (3) applying hydraulic pressure to the inner wall of the hydrogen conveying pipe by using the hollow core rod for strengthening, wherein the hydraulic pressure is 270MPa.
(3) Reaming and honing
And (3) reaming the reinforced hydrogen conveying pipe, wherein the reaming size is 0.5% smaller than the finished product size, and honing the reinforced hydrogen conveying pipe to the finished product size.
Comparative example 3
The diameter of the inner hole finished product of the hydrogen conveying pipe is 4mm, and the preparation method comprises the following steps:
(1) And (3) drilling the 6061 aluminum alloy bar, wherein the inner diameter size of the drilled hole is 1% smaller than the size of the finished product, and the surface roughness of the inner hole is 0.8 mu m.
(2) Reaming and honing
And reaming the drilled hydrogen conveying pipe, wherein the reaming size is 1.0% smaller than the finished product size, and honing the drilled hydrogen conveying pipe to the finished product size.
Example 4
The diameter of the inner hole finished product of the hydrogen conveying pipe is 4mm, and the preparation method comprises the following steps:
(1) Deep hole drill
And (3) drilling the 6061 aluminum alloy bar, wherein the inner diameter size of the drilled hole is 12.0% smaller than the size of a finished product, and the surface roughness of the inner hole is 1.2 mu m.
(2) Inner hole reinforcement
The hollow core rod is adopted to apply hydraulic pressure to the inner wall of the hydrogen conveying pipe for strengthening, and the hydraulic pressure is 290MPa.
(3) Reaming and honing
And (3) reaming the reinforced hydrogen conveying pipe, wherein the reaming size is 1.0% smaller than the finished product size, and honing the reinforced hydrogen conveying pipe to the finished product size.
Comparative example 4
(1) And (3) drilling the 6061 aluminum alloy bar, wherein the inner diameter size of the drilled hole is 1.5% smaller than the size of the finished product, and the surface roughness of the inner hole is 1.2 mu m.
(2) Reaming and honing
And reaming the drilled hydrogen conveying pipe, wherein the reaming size is 1.0% smaller than the finished product size, and honing the drilled hydrogen conveying pipe to the finished product size.
Table 1 shows that the method of the invention can improve the surface roughness of the hydrogen pipe as compared with the method without the invention; table 2 shows the effect of the hydrogen pipe prepared by the invention compared with the room temperature fatigue life of the hydrogen pipe prepared by the invention, and the fatigue life of the hydrogen pipe after strengthening is improved by 1.5-2 times.
Table 1 comparison of parameters of examples 1-4 and comparative examples 1-4
Table 2 comparison of room temperature fatigue life for examples 1-4 and comparative examples 1-4
Claims (2)
1. A method for improving the fatigue life of a hydrogen delivery pipe of a 6061 aluminum alloy hydrogenation gun is characterized by comprising the following steps: the method comprises the following steps:
firstly, drilling holes on 6061 aluminum alloy bars by adopting a deep hole drilling mode to obtain a hydrogen transmission pipe, turning the outer circle of the outer wall of the hydrogen transmission pipe to a specified outer diameter, wherein the inner diameter of a drilled blank is 5.0-12.0% smaller than the inner diameter of a finished product, and the surface roughness of an inner hole is controlled to be 0.8-1.2 mu m;
secondly, carrying out inner wall strengthening treatment on the hydrogen conveying pipe drilled in the first step, wherein the strengthening treatment is to clamp and seal two ends of the hydrogen conveying pipe, insert a core rod with a hole into the hydrogen conveying pipe, then apply hydraulic pressure to the inner wall of the hydrogen conveying pipe through the core rod for strengthening, and the surface roughness of an inner hole after strengthening is 0.4-0.8 mu m;
thirdly, reaming the hydrogen delivery pipe with the reinforced inner wall in the second step, wherein the inner diameter of the reamed hydrogen delivery pipe is 0.5-1% smaller than the inner diameter of a finished product, honing the reamed hydrogen delivery pipe to the inner diameter of the finished product, and the surface roughness of the honed inner hole is not more than 0.4 mu m;
the outer diameter of the 6061 aluminum alloy bar stock in the first step is 14-22 mm;
the inner diameter of the finished product in the first step is 4-8mm;
when the inner diameter of the finished product is 4-6mm in the first step, the inner diameter of a drilled blank is 8.0-12.0% smaller than the inner diameter of the finished product, hydraulic pressure is applied to the inner wall of the hydrogen delivery pipe by using a hollow core rod for strengthening, and the hydraulic pressure is 260-290 MPa; and in the first step, when the inner diameter of the finished product is 6-8mm, the inner diameter of a blank of the drilled hole is 5.0-8.0% smaller than the inner diameter of the finished product, and a hollow core rod is adopted to apply hydraulic pressure to the inner wall of the hydrogen delivery pipe for strengthening, wherein the hydraulic pressure is 230-260 MPa.
2. The method for improving the fatigue life of the hydrogen delivery pipe of the 6061 aluminum alloy hydrogenation gun according to claim 1, wherein the method comprises the following steps: and in the third step, the surface roughness of the inner hole after honing is 0.2-0.4 mu m.
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| 喷丸对2024铝合金试样表面质量及疲劳拉伸性能的影响;王帅;王建明;董国振;;材料保护;20180215(02);第73-77页 * |
| 喷丸强化对新型7055-T7751铝合金疲劳性能的影响;李鹏;刘道新;关艳英;成书民;赵远兴;曹亮;李欢;;机械工程材料;20150120(01);第86-89、93页 * |
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| CN117464327A (en) | 2024-01-30 |
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