CN114351077A - Spraying and grinding process method for tungsten carbide on surface of polished rod of bolt part - Google Patents
Spraying and grinding process method for tungsten carbide on surface of polished rod of bolt part Download PDFInfo
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- CN114351077A CN114351077A CN202111471882.6A CN202111471882A CN114351077A CN 114351077 A CN114351077 A CN 114351077A CN 202111471882 A CN202111471882 A CN 202111471882A CN 114351077 A CN114351077 A CN 114351077A
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- Prior art keywords
- bolt
- grinding
- tungsten carbide
- spraying
- polished rod
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- 238000000034 method Methods 0.000 title claims abstract description 34
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 238000005507 spraying Methods 0.000 title claims abstract description 29
- 239000011248 coating agent Substances 0.000 claims abstract description 19
- 238000000576 coating method Methods 0.000 claims abstract description 19
- 230000003746 surface roughness Effects 0.000 claims abstract description 18
- 229910003460 diamond Inorganic materials 0.000 claims description 27
- 239000010432 diamond Substances 0.000 claims description 27
- 238000005422 blasting Methods 0.000 claims description 13
- 238000001125 extrusion Methods 0.000 claims description 8
- 238000005498 polishing Methods 0.000 claims description 8
- 238000005488 sandblasting Methods 0.000 claims description 8
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000006247 magnetic powder Substances 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052801 chlorine Inorganic materials 0.000 claims description 3
- 239000000460 chlorine Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010285 flame spraying Methods 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 3
- 229910001385 heavy metal Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000007689 inspection Methods 0.000 abstract description 2
- 239000006249 magnetic particle Substances 0.000 abstract 1
- 229910009043 WC-Co Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a spraying and grinding process method of tungsten carbide on the surface of a polished rod of a bolt part. The coating surface is rougher after the spraying, need carry out the grinding to the surface and guarantee, and surface quality and dimensional accuracy require, detects bolt surface roughness through the roughness meter at last, and the micrometer detects bolt polished rod diameter, detects whether there is stress on the polished rod surface through fluorescence magnetic particle inspection simultaneously. The invention not only ensures the strength of the bolt matrix, but also improves the wear resistance and fatigue performance of the surface of the bolt polished rod, obviously prolongs the service life of the bolt and reduces the use and maintenance cost. Tests prove that after the method is adopted, the surface roughness of the bolt can reach Ra0.2 mu m, the dimensional accuracy can be controlled at 6-level accuracy, and the fatigue life of the bolt can be prolonged by more than 30%.
Description
Technical Field
The invention relates to the technical field of metal machining, in particular to a tungsten carbide spraying and grinding process method for the surface of a polished rod of a bolt part.
Background
The helicopter rotor moving part is a core part of a helicopter, generates lift force, pulling force and operating force necessary for the flight of the helicopter, integrates multiple functions, and connecting bolts at key parts often bear high-frequency complex load during flight, are easy to wear or deform, so that the problems of short service life and low reliability of the bolts are caused. With the development requirement of a novel helicopter, the requirement of higher service life is provided for the connecting bolt at the key part of the rotor wing moving part, and in order to solve the problem of the wear resistance of the surface of the bolt and improve the service life, the WC-Co coating is thermally sprayed on the surface of the polished rod of the bolt, so that the process has the advantages of no hydrogen embrittlement, high binding force, good wear resistance, environmental protection and the like compared with the traditional chromium plating process (wear resistance requirement).
The WC-Co coating has high hardness, a diamond grinding wheel is generally adopted for grinding, the tungsten carbide coating on the surface of the bolt is ground according to stainless steel grinding experience parameters, the surface quality is poor after grinding, and through surface magnetic powder flaw detection, the existence of magnetic powder on the surface shows that tensile stress exists, and the tensile stress is harmful to the fatigue performance of the bolt, so that the fatigue performance of the bolt is reduced. In the traditional spraying process and grinding process, shot blasting is not carried out before the tungsten carbide is sprayed on the surface of the bolt polished rod, so that the strength of the bolt body is weak, and coarse grinding and fine grinding are not distinguished in the grinding process; and the corresponding grinding wheel, and the process parameters in the grinding process have great influence on the final grinding effect.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a tungsten carbide spraying and grinding process method for the surface of a polished rod of a bolt part, which can ensure the surface quality of a coating and the dimensional precision requirement of the polished rod, improve the wear resistance and fatigue performance of the surface of the bolt, reduce the use and maintenance cost of the bolt and ensure the flight safety.
The purpose of the invention is realized by adopting the following technical scheme:
a spraying and grinding process method of tungsten carbide on the surface of a polished rod of a bolt part comprises the following steps:
s1: grinding the surface of the bolt polished rod to a corresponding size to ensure that the roughness Ra0.8 mu m;
s2: shot blasting is carried out on the bolt polish rod, so that the fatigue strength of a bolt polish rod matrix is improved;
s3: the surface of the bolt polished rod is subjected to uniform sand blasting treatment, and tungsten carbide spraying is carried out within 2 hours after sand blasting, so that the binding force between a tungsten carbide coating and a matrix is improved;
s4: placing the bolt on supersonic flame spraying equipment, spraying fuel and oxygen through high pressure, burning outside the nozzle, axially feeding powder particles from the inner side of the nozzle by high-pressure gas, compressing and accelerating burning flame by compressed gas in an air hood outside the nozzle, and finally spraying the molten powder on the surface of an extrusion core rod;
s5: clamping the tungsten carbide sprayed bolt on an outer circular grinding machine, and roughly grinding a tungsten carbide area of the bolt by using a diamond grinding wheel to ensure that the surface roughness of the bolt reaches Ra0.6-Ra0.8 mu m and the grinding removal amount of a tungsten carbide coating is 0.13-0.15 mm;
s6: a diamond grinding wheel is adopted to carry out fine grinding on the bolt tungsten carbide area, the surface roughness after grinding reaches Ra0.3-Ra0.5 mu m, and the grinding quantity of the tungsten carbide coating is 0.04-0.06 mm;
s7: polishing the extrusion part of the tungsten carbide area by using a diamond polishing belt or diamond grinding paste, wherein the surface roughness reaches Ra0.1-Ra0.2 mu m, the polishing amount is 0.01mm, and the diameter of a polished rod reaches the final size requirement;
and S8, detecting the diameter, the surface roughness and the surface stress of the screw rod.
Preferably, the shot blasting intensity in the step S2 is 0.3 mmA-1 mmA, and the shot blasting time is 1-3 min/cm2。
Preferably, in step S5, the diamond grinding wheel has a grit number of 150# to 300#, and the grinding fluid is an oily grinding fluid free of chlorine, sulfur and heavy metals.
Preferably, the diamond wheel has a grit number of 800# to 1000# in step S6.
Preferably, the diamond grinding wheel is a resin bond diamond grinding wheel.
Preferably, the transverse moving speed of the carborundum belt in the step S5 is 10mm/S, and the pressure of the carborundum belt on the coating is 0.18 MPa-0.2 MPa.
Preferably, the transverse moving speed of the carborundum belt in the step S6 is 5mm/S, and the pressure of the carborundum belt on the coating is 0.15 MPa-0.18 MPa.
Preferably, the processing time of step S5 or S6 is generally 1min to 30 min.
Preferably, in step S8, a micrometer is used to measure whether the diameter of the bolt polish rod meets the size requirement, a roughness meter is used to measure whether the surface roughness of the bolt meets the roughness requirement, and a fluorescent magnetic powder inspection is used to measure whether the surface of the bolt polish rod has stress.
Compared with the prior art, the invention has the beneficial effects that:
the invention not only ensures the strength of the bolt matrix, but also improves the wear resistance and fatigue performance of the surface of the bolt polished rod, obviously prolongs the service life of the bolt and reduces the use and maintenance cost. Tests prove that after the method is adopted, the surface roughness of the bolt can reach Ra0.2 mu m, the dimensional accuracy can be controlled at 6-level accuracy, and the fatigue life of the bolt can be prolonged by more than 30%.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a diagram of the surface grinding dimension of a bolt polished rod;
FIG. 2 is a diagram of a shot blasting area of a bolt polish rod;
fig. 3 is a diagram of a tungsten carbide spray area.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood 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.
In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Grinding the surface of the bolt polished rod to meet the size requirement, and simultaneously ensuring the roughness Ra0.8 mu m as shown in figure 1; shot blasting is carried out on the bolt polish rod, and the shot blasting intensity is selected according to relevant standards, as shown in figure 2; carrying out uniform sand blasting treatment on the surface of the bolt polished rod, wherein missed blasting is not allowed, spraying must be carried out within 2 hours after sand blasting, if spraying is not carried out immediately after sand blasting treatment, parts must be wrapped by clean materials, the retention time before spraying exceeds 2 hours or the surface is polluted, and carrying out sand blasting treatment again; placing the bolt on a supersonic flame spraying device, spraying fuel and oxygen by high pressure, burning outside the nozzle, axially feeding powder particles from the inner side of the nozzle by high-pressure gas, compressing and accelerating burning flame by compressed gas in an air hood outside the nozzle, and finally spraying the molten powder on the surface of the extrusion core rod, wherein the spraying thickness is 0.5mm, and the required thickness of the coating is 0.3mm, as shown in figure 3; processing the extrusion core rod according to a typical process flow of rough machining, heat treatment and finish machining, wherein the structural size is determined according to the size of an actual extrusion hole; clamping the bolt sprayed with tungsten carbide on an outer circle grinding machine, firstly, roughly grinding a WC-Co area of the bolt by using a diamond grinding wheel with the grit number of 150# to 300# (the diamond grinding wheel is a resin bond diamond grinding wheel), wherein the transverse moving speed of the diamond grinding wheel is 10mm/s, the pressure of the diamond grinding wheel on a coating is 0.18MPa to 0.2MPa, and the processing time is generally 1min to 30 min. The grinding fluid is oily grinding fluid which does not contain chlorine, sulfur and heavy metals, the surface roughness reaches Ra0.6-Ra0.8 mu m after grinding, the grinding removal amount of a WC-Co coating is 0.13-0.15 mm, then a diamond grinding wheel with the grain number of 800-1000 # is adopted to carry out fine grinding on a bolt WC-Co area, the transverse moving speed of a diamond abrasive belt during treatment is 5mm/s, the pressure of the diamond abrasive belt on the coating is 0.15-0.18 MPa, and the treatment time is generally 1-30 min. After grinding, the surface roughness reaches Ra0.3-Ra0.5 μm, the grinding quantity of a WC-Co coating is 0.04-0.06 mm, finally, a WC-Co area extrusion part is polished by adopting a diamond polishing belt or diamond grinding paste, the surface roughness reaches Ra0.1-Ra0.2 μm, the polishing quantity is 0.01mm, and the diameter of a polished rod reaches the final size requirement; the micrometer is used for measuring whether the diameter of the bolt polish rod meets the size requirement or not, the roughness meter is used for detecting whether the surface roughness of the bolt meets the roughness requirement or not, and the fluorescent magnetic powder flaw detection is used for detecting whether the surface of the polish rod has stress or not. The process not only ensures the strength of the bolt matrix, but also improves the wear resistance and fatigue performance of the surface of the bolt polished rod, so that the service life of the bolt is obviously prolonged, and the use and maintenance cost is reduced. Tests prove that after the method is adopted, the surface roughness of the bolt can reach Ra0.2 mu m, the dimensional accuracy can be controlled at 6-level accuracy, and the fatigue life of the bolt can be prolonged by more than 30%.
Furthermore, the shot blasting intensity is 0.3 mmA-1 mmA, and the shot blasting time is 1-3 min/cm2。
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A spraying and grinding process method of tungsten carbide on the surface of a polished rod of a bolt part is characterized by comprising the following steps:
s1: grinding the surface of the bolt polished rod to a corresponding size to ensure that the roughness Ra0.8 mu m;
s2: shot blasting is carried out on the bolt polish rod;
s3: carrying out uniform sand blasting treatment on the surface of the bolt polished rod, and carrying out tungsten carbide spraying within 2 hours after sand blasting;
s4: placing the bolt on supersonic flame spraying equipment, spraying fuel and oxygen through high pressure, burning outside the nozzle, axially feeding powder particles from the inner side of the nozzle by high-pressure gas, compressing and accelerating burning flame by compressed gas in an air hood outside the nozzle, and finally spraying the molten powder on the surface of an extrusion core rod;
s5: clamping the tungsten carbide sprayed bolt on an outer circular grinding machine, and roughly grinding a tungsten carbide area of the bolt by using a diamond grinding wheel to ensure that the surface roughness of the bolt reaches Ra0.6-Ra0.8 mu m and the grinding removal amount of a tungsten carbide coating is 0.13-0.15 mm;
s6: a diamond grinding wheel is adopted to carry out fine grinding on the bolt tungsten carbide area, the surface roughness after grinding reaches Ra0.3-Ra0.5 mu m, and the grinding quantity of the tungsten carbide coating is 0.04-0.06 mm;
s7: polishing the extrusion part of the tungsten carbide area by using a diamond polishing belt or diamond grinding paste, wherein the surface roughness reaches Ra0.1-Ra0.2 mu m, the polishing amount is 0.01mm, and the diameter of a polished rod reaches the final size requirement;
and S8, detecting the diameter, the surface roughness and the surface stress of the screw rod.
2. The spraying and grinding process of tungsten carbide on the surface of the polished rod of the bolt part as claimed in claim 1, wherein: in the step S2, the shot blasting intensity is 0.3 mmA-1 mmA, and the shot blasting time is 1-3 min/cm2。
3. The spraying and grinding process of tungsten carbide on the surface of the polished rod of the bolt part as claimed in claim 1, wherein: in step S5, the diamond grinding wheel has a grit number of 150# to 300# and the grinding fluid is an oily grinding fluid without chlorine, sulfur and heavy metals.
4. The spraying and grinding process of tungsten carbide on the surface of the polished rod of the bolt part as claimed in claim 1, wherein: in step S6, the diamond grinding wheel has a grit number of 800# to 1000 #.
5. The spraying and grinding process of tungsten carbide on the surface of the polished rod of the bolt part as claimed in claim 3 or 4, wherein: the diamond grinding wheel is a resin bond diamond grinding wheel.
6. The spraying and grinding process of tungsten carbide on the surface of the polished rod of the bolt part as claimed in claim 1, wherein: the transverse moving speed of the carborundum belt is 10mm/S when the treatment of the step S5 is carried out, and the pressure of the carborundum belt to the coating is 0.18 MPa-0.2 MPa.
7. The spraying and grinding process of tungsten carbide on the surface of the polished rod of the bolt part as claimed in claim 1, wherein: the transverse moving speed of the carborundum belt is 5mm/S when the step S6 is processed, and the pressure of the carborundum belt on the coating is 0.15 MPa-0.18 MPa.
8. The spraying and grinding process of tungsten carbide on the surface of the polished rod of the bolt part as claimed in claim 6 or 7, wherein: the processing time of step S5 or S6 is 1min to 30 min.
9. The spraying and grinding process of tungsten carbide on the surface of the polished rod of the bolt part as claimed in claim 1, wherein: in the step S8, a micrometer is used for measuring whether the diameter of the bolt polish rod meets the size requirement, a roughness meter is used for detecting whether the surface roughness of the bolt meets the roughness requirement, and fluorescent magnetic powder flaw detection is used for detecting whether the surface of the bolt has stress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111471882.6A CN114351077A (en) | 2021-12-03 | 2021-12-03 | Spraying and grinding process method for tungsten carbide on surface of polished rod of bolt part |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111471882.6A CN114351077A (en) | 2021-12-03 | 2021-12-03 | Spraying and grinding process method for tungsten carbide on surface of polished rod of bolt part |
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| CN114351077A true CN114351077A (en) | 2022-04-15 |
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| CN202111471882.6A Pending CN114351077A (en) | 2021-12-03 | 2021-12-03 | Spraying and grinding process method for tungsten carbide on surface of polished rod of bolt part |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114683101A (en) * | 2022-04-29 | 2022-07-01 | 中国电子科技集团公司第十四研究所 | Forming method of fluid rotary joint rotating shaft |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110218963A (en) * | 2019-06-11 | 2019-09-10 | 江西昌河航空工业有限公司 | The wear-resisting extruding plug of one kind and processing technology |
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2021
- 2021-12-03 CN CN202111471882.6A patent/CN114351077A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110218963A (en) * | 2019-06-11 | 2019-09-10 | 江西昌河航空工业有限公司 | The wear-resisting extruding plug of one kind and processing technology |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114683101A (en) * | 2022-04-29 | 2022-07-01 | 中国电子科技集团公司第十四研究所 | Forming method of fluid rotary joint rotating shaft |
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