CN109778120A - Hydraulic valve rod and preparation method thereof - Google Patents
Hydraulic valve rod and preparation method thereof Download PDFInfo
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- CN109778120A CN109778120A CN201910193019.5A CN201910193019A CN109778120A CN 109778120 A CN109778120 A CN 109778120A CN 201910193019 A CN201910193019 A CN 201910193019A CN 109778120 A CN109778120 A CN 109778120A
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- coating
- valve rod
- hydraulic valve
- matrix
- valve stem
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- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000011248 coating agent Substances 0.000 claims abstract description 75
- 238000000576 coating method Methods 0.000 claims abstract description 75
- 239000000463 material Substances 0.000 claims abstract description 25
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000001771 vacuum deposition Methods 0.000 claims abstract description 16
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 13
- 239000011651 chromium Substances 0.000 claims abstract description 13
- 230000007704 transition Effects 0.000 claims abstract description 5
- 239000011159 matrix material Substances 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 19
- 238000000227 grinding Methods 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 6
- 238000005728 strengthening Methods 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000007733 ion plating Methods 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 21
- 230000007797 corrosion Effects 0.000 abstract description 13
- 239000000758 substrate Substances 0.000 abstract 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000005299 abrasion Methods 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 13
- 239000010410 layer Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000002131 composite material Substances 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005256 carbonitriding Methods 0.000 description 3
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
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Abstract
The invention discloses a hydraulic valve rod and a preparation method thereof, wherein the hydraulic valve rod comprises a substrate, wherein a first coating and a second coating are sequentially arranged on the surface of the substrate; the first coating is made of chromium, and the second coating is made of chromium nitride; the first coating has a hardness of 500-600HV and a thickness of 0.2-0.4 μm; the hardness of the second coating is 1500-2000HV, and the thickness is 1-3 μm; the first coating is positioned between the substrate and the second coating and is a transition layer; the mechanical property difference of the materials can be relieved, the binding force of the chromium nitride and the valve rod is improved, and the service life of the hydraulic valve rod is prolonged. The first coating and the second coating are strengthened by vacuum coating, and the hydraulic valve rod with high wear resistance, high corrosion resistance and friction reduction is provided, so that the problems that the hydraulic valve rod prepared by the prior art is easy to wear and corrode are solved.
Description
Technical field
The invention belongs to engineering machinery hydraulic components manufacturing technology field, it is related to a kind of hydraulic valve stem and its preparation side
Method, in particular to a kind of hydraulic valve stem with the high anti-corrosion antifriction performance of high abrasion and its preparation side based on vacuum coating technology
Method.
Background technique
Hydraulic valve stem is the core control element in hydraulic valve, and hydraulic valve is using valve rod in the intracorporal relative motion of valve come real
Now to pressure, flow and the control in direction.Hydraulic valve during the work time, constantly rubs between valve rod and valve body, and friction causes
Hydraulic valve stem surface abrasion；In the long-term use process of hydraulic valve stem, the moisture and acidic materials being mixed in hydraulic oil are to valve
It causes to corrode in bar surface；Abrasion and corrosion can all change the critical size and surface quality of valve rod, so that the internal leakage of hydraulic valve
Amount, which increases, even to fail, therefore hydraulic valve stem should be provided simultaneously with the performances such as high abrasion, high anti-corrosion, antifriction in use.
Currently, the hydraulic valve stem surface covering hardness manufactured using technologies such as electrodeposited chromium, high-frequency quenching, liquid carbonitridings
It is low, corrosion-resistant, corrosion resistance is insufficient, it is difficult to meet above-mentioned requirement.
The prior art has the disadvantage in that
(1) hydraulic valve stem is strengthened in plating: the hydraulic valve stem coating material of program manufacture is generally chromium and its composite material,
The hardness of electrocoat a maximum of about of 850HV, thickness are typically designed as 0.01-0.02mm.In use, due to frictional force compared with
Greatly, and electrocoat hardness is lower, and it is very fast in turn result in the hydraulic valve stem surface covering rate of wear.Meanwhile plating is due to electric current
" point effect " is easy to produce the burr for being difficult to remove, is easy to cause valve rod stuck.In addition, program environment friendly is poor,
Harm to the human body is larger.
(2) liquid carbonitriding strengthens hydraulic valve stem: intensive treatment is carried out to hydraulic valve stem using the program, it is obtained
About 20-30 μm of surface peening coating thickness, microhardness averagely about 800HV-850HV.Since coating hardness is insufficient, corrosion resistance
Can be general, service life is shorter.In addition, program manufacturing process is relatively complicated, process for making influence factor is more, coating
Quality control difficulty is big, and production efficiency is low, and disposably puts into larger.
(3) high-frequency quenching strengthens hydraulic valve stem: compared with other schemes, carrying out hydraulic valve stem surface peening using the program
When processing, the thickness averagely about 0.5mm-1.5mm, microhardness 450-550HV of obtained surface peening layer.Due to quench-hardened case compared with
Thin, hardness is insufficient, and hardened layer is relatively also easy to produce abrasion.In addition, the valve rod corrosion resistance of high-frequency quenching is very poor, quenching technical compares
Complexity is difficult to control.
Summary of the invention
Purpose: in order to overcome the deficiencies in the prior art, the present invention provides a kind of hydraulic valve stem and preparation method thereof,
The high anti-corrosion antifriction of the hydraulic valve stem high abrasion of preparation, on the one hand, hydraulic valve stem hardness with higher and wearability solve existing
The problems such as valve rod since surface hardness is insufficient, abrasion is very fast, the service life is shorter, is unable to satisfy requirement；On the other hand, valve rod has
There is high corrosion resistance, the erosion resisted be mixed with acidic materials in hydraulic oil for a long time can be supported；In addition, hydraulic valve stem surface peening layer
Also there is antifriction performance, the andfrictional conditions between stem surface and valve body mating surface can be improved, promote the working performance of hydraulic valve stem,
Prolong the service life.
Technical solution: in order to solve the above technical problems, the technical solution adopted by the present invention are as follows:
A kind of hydraulic valve stem, including matrix,
The surface of described matrix is disposed with first coating and second coating；
The material of the first coating is chromium, and the material of the second coating is chromium nitride；
The hardness of the first coating is 500-600HV, with a thickness of 0.2-0.4 μm；
The hardness of the second coating is 1500-2000HV, with a thickness of 1-3 μm；
The first coating is transition zone, can alleviate material mechanical performance difference between matrix and second coating, is promoted
The binding force of chromium nitride and valve rod, and then improve the service life of hydraulic valve stem.
The first coating is prepared by vacuum coating mode.
The second coating is prepared by vacuum coating mode.
Further, the preparation method of the hydraulic valve stem, comprising:
(1) it is machined and valve rod matrix is made；
(2) valve rod matrix is roughly ground；
(3) valve rod matrix is refined and is polished；Valve rod roughness reaches the roughness of design after the process, and in final ruler
The overall thickness H of strengthening layer is reserved on the basis of very little, does not need to post-process after plated film；
(4) after the fine grinding of valve rod matrix, polishing, valve rod matrix is surpassed respectively using petrolic solvent and alcohol respectively
Sound cleaning, removes the remaining impurity of valve rod matrix surface, then valve rod matrix is put into air dry oven, makes valve rod matrix table
The remaining organic solvent in face sufficiently volatilizees；
(5) first coating, second coating are successively prepared in valve rod matrix surface using arc ion plating (aip)；The first coating
Material be chromium, the material of the second coating is chromium nitride.
Vacuum coating technology is the key technology of surface peening engineering field, can be with by selecting the target of unlike material
The coating with different performances such as high rigidity, highly corrosion resistants is prepared, to be widely used in having Special use performance requirement zero
The manufacture of component.Currently, being existed using the hydraulic valve stem that vacuum coating technology manufacture has the performances such as high abrasion, high anti-corrosion, antifriction
The country there is no precedent.
Further, the preparation method of the hydraulic valve stem, which is characterized in that the hardness of the first coating is 500-
600HV, with a thickness of 0.2-0.4 μm.
Further, the preparation method of the hydraulic valve stem, which is characterized in that the hardness of the second coating is
1500-2000HV, with a thickness of 1-3 μm.
The utility model has the advantages that hydraulic valve stem provided by the invention and preparation method thereof, is prepared for high-performance on hydraulic valve stem surface
Coating has the comprehensive performances such as hardness, high abrasion, high anti-corrosion, antifriction, greatly meets its requirement, extend its use
Service life.It is had the advantage that in use process
(1) the Cr-CrN composite coating that the surface of provided hydraulic valve stem uses vacuum coating technology to prepare, coating layer thickness are only
1.2-3.4 μm, the strengthening layer thickness of opposite traditional handicraft preparation is thin, and performance boost amplitude is larger, and does not need to post-process.It can
The technical solutions such as replacing electroplating is strengthened, liquid carbonitriding is strengthened, do not generate burr, do not need to post-process, and environmentally friendly,
Have the characteristics that simple, efficient, environmentally protective.
(2) surface covering of provided hydraulic valve stem is a kind of composite coating, and wherein the chromium nitride on surface layer has high rigidity
And high abrasion, the abrasive wear resistance of coating can be promoted significantly, and middle layer is chromium, and it is poor can to alleviate material mechanical performance
It is different, the binding force of chromium nitride and valve rod is promoted, and then improve the service life of hydraulic valve stem.
(3) it is mainly chromium nitride ceramic material in the surface covering of provided hydraulic valve stem, there is stronger corrosion resistance
Can, therefore prepared hydraulic valve stem has stronger corrosion resistance.
(4) the chromium nitride material in the surface covering of provided hydraulic valve stem has lower coefficient of friction, can play
Good friction reducing effect.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the hydraulic valve stem surface covering of embodiment；
Fig. 2 is the flow chart of the hydraulic valve stem preparation method of embodiment.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the present invention and its application or make
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
It is not limited the scope of the invention up to formula and numerical value.Simultaneously, it should be appreciated that for ease of description, each portion shown in attached drawing
The size divided not is to draw according to actual proportionate relationship.For technology, side known to person of ordinary skill in the relevant
Method and equipment may be not discussed in detail, but in the appropriate case, and the technology, method and apparatus should be considered as authorizing explanation
A part of book.In shown here and discussion all examples, any occurrence should be construed as merely illustratively, and
Not by way of limitation.Therefore, the other examples of exemplary embodiment can have different values.It should also be noted that similar label
Similar terms are indicated in following attached drawing with letter, therefore, once it is defined in a certain Xiang Yi attached drawing, then subsequent attached
It does not need that it is further discussed in figure.
Embodiment 1
As shown in Figure 1, a kind of hydraulic valve stem, including matrix 1,
The surface of described matrix 1 is disposed with first coating 2 and second coating 3；
The material of the first coating 2 is chromium, and the material of the second coating 3 is chromium nitride；
The hardness of the first coating is 500-600HV, with a thickness of 0.2-0.4 μm；
The hardness of the second coating is 1500-2000HV, with a thickness of 1-3 μm；
The first coating 2 is transition zone, can alleviate material mechanical performance difference between matrix 1 and second coating 3,
The binding force of chromium nitride and valve rod is promoted, and then improves the service life of hydraulic valve stem.
The first coating 2 is prepared by vacuum coating mode.
The second coating 3 is prepared by vacuum coating mode.
Further, the preparation method of the hydraulic valve stem, comprising:
(1) it is machined and valve rod matrix 1 is made；
(2) valve rod matrix 1 is roughly ground；
(3) valve rod matrix 1 is refined and is polished；
(4) after the fine grinding of valve rod matrix 1, polishing, valve rod matrix is surpassed respectively using petrolic solvent and alcohol respectively
Sound cleaning, removes the remaining impurity of valve rod matrix surface, then valve rod matrix is put into air dry oven, makes valve rod matrix table
The remaining organic solvent in face sufficiently volatilizees；
(5) first coating 2, second coating 3 are successively prepared in valve rod matrix surface using arc ion plating (aip)；Described first applies
The material of layer is chromium, and the material of the second coating is chromium nitride.
Vacuum coating technology is the key technology of surface peening engineering field, can be with by selecting the target of unlike material
The coating with different performances such as high rigidity, highly corrosion resistants is prepared, to be widely used in having Special use performance requirement zero
The manufacture of component.Currently, being existed using the hydraulic valve stem that vacuum coating technology manufacture has the performances such as high abrasion, high anti-corrosion, antifriction
The country there is no precedent.
Further, the hardness of the first coating is 500-600HV, with a thickness of 0.2-0.4 μm.
Further, the hardness of the second coating is 1500-2000HV, with a thickness of 1-3 μm.
The invention discloses a kind of engineering machinery with the high anti-corrosion antifriction of high abrasion based on technique for vacuum coating manufacture
Hydraulic valve stem.
(1) plated film after surface fine grinding, polishing, does not need to post-process: hydraulic valve stem disclosed by the invention and conventional method system
There is different (as shown in Figure 2) in manufacturing procedure in standby valve rod, traditional processing method generally prepares strengthening layer after corase grinding, so
Extra size is removed using fine grinding, polishing afterwards, the size for reaching stem design requires and roughness.The present invention is in roughly grinding operation
Afterwards, directly valve rod is refined and is polished, reach the roughness of design, and subtract plating on the basis of periphery design size
The thickness H of film, since the roughness of matrix is inherited in vacuum coating, so valve rod does not need any post-processing after plated film.
(2) valve rod pre-processes: making respectively after valve rod fine grinding, polishing to meet the cleannes requirement of stem surface
Valve rod is cleaned by ultrasonic respectively with petrolic solvent and alcohol, the impurity such as the remaining metal fragment of removal stem surface, grease,
Then valve rod is put into air dry oven, the remaining organic solvent of stem surface is made sufficiently to volatilize.
(3) hydraulic valve stem surface covering design requirement: 1, being the requirement for meeting hydraulic valve stem, and devising has height hard
Degree, high-wear resistance, high-corrosion resistance coating.Coating is the chromium nitride coating prepared using arc ion plating (aip), nitrogen
Change the ceramic material that chromium is high rigidity, hardness is up to 1500-2000HV, and with a thickness of 1-3 μm, while chromium nitride coating is with lower
Coefficient of friction, can play a good anti-friction effect.2, stem material is softer, with chromium nitride in hardness and thermal expansion coefficient
There are bigger differences to establish chromium transition zone, hardness is to guarantee the binding force between chromium nitride and valve body between
500-600HV, with a thickness of 0.2-0.4 μm.3, coating is prepared based on vacuum coating technology and equipment, overall thickness H design
It is 1.2-3.4 μm.
Hydraulic valve stem surface provided by the invention is prepared for high-performance coating, has the advantage that in use process
(1) the surface covering thickness of provided hydraulic valve stem is only 1.2-3.4 μm, the strengthening layer thickness of opposite traditional handicraft preparation
Thin, performance boost amplitude is larger, and does not need to post-process.
(2) surface covering of provided hydraulic valve stem is a kind of composite coating, and wherein the chromium nitride on surface layer has high rigidity
And high abrasion, the abrasive wear resistance of coating can be promoted significantly, and middle layer is chromium, and it is poor can to alleviate material mechanical performance
It is different, the binding force of chromium nitride and valve rod is promoted, and then improve the service life of hydraulic valve stem.
(3) it is mainly chromium nitride ceramic material in the surface covering of provided hydraulic valve stem, there is stronger corrosion resistance
Can, therefore prepared hydraulic valve stem has stronger corrosion resistance.
(4) the chromium nitride material in the surface covering of provided hydraulic valve stem has lower coefficient of friction, can play
Good friction reducing effect.
In the description of the present application, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", "front", "rear",
The orientation or positional relationship of the instructions such as "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is based on attached drawing institute
The orientation or positional relationship shown is only the present invention and simplified description for ease of description, rather than indicates or imply signified device
Or element must have a particular orientation, construct and operate for specific orientation, thus should not be understood as in present invention protection
The limitation of appearance.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of hydraulic valve stem, including matrix, which is characterized in that
The surface of described matrix is disposed with first coating and second coating；
The material of the first coating is chromium, and the material of the second coating is chromium nitride；
The hardness of the first coating is 500-600HV, with a thickness of 0.2-0.4 μm；
The hardness of the second coating is 1500-2000HV, with a thickness of 1-3 μm；
The first coating is transition zone between matrix and second coating.
2. hydraulic valve stem according to claim 1, which is characterized in that the first coating is prepared by vacuum coating mode
It forms.
3. hydraulic valve stem according to claim 1, which is characterized in that the second coating passes through vacuum coating mode system
It is standby to form.
4. the preparation method of the described in any item hydraulic valve stems of claim 1-3 characterized by comprising
(1) it is machined and valve rod matrix is made；
(2) valve rod matrix is roughly ground；
(3) valve rod matrix is refined and is polished；Valve rod roughness reaches the roughness of design after the process, and in final ruler
The overall thickness H of strengthening layer is reserved on the basis of very little, does not need to post-process after plated film；
(4) after the fine grinding of valve rod matrix, polishing, valve rod matrix is surpassed respectively using petrolic solvent and alcohol respectively
Sound cleaning, removes the remaining impurity of valve rod matrix surface, then valve rod matrix is put into air dry oven, makes valve rod matrix table
The remaining organic solvent in face sufficiently volatilizees；
(5) first coating, second coating are successively prepared in valve rod matrix surface using arc ion plating (aip)；The first coating
Material be chromium, the material of the second coating is chromium nitride.
5. the preparation method of hydraulic valve stem according to claim 4, which is characterized in that the hardness of the first coating is
500-600HV, with a thickness of 0.2-0.4 μm.
6. the preparation method of hydraulic valve stem according to claim 4, which is characterized in that the hardness of the second coating is
1500-2000HV, with a thickness of 1-3 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910193019.5A CN109778120A (en) | 2019-03-14 | 2019-03-14 | Hydraulic valve rod and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910193019.5A CN109778120A (en) | 2019-03-14 | 2019-03-14 | Hydraulic valve rod and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109778120A true CN109778120A (en) | 2019-05-21 |
Family
ID=66489264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910193019.5A Pending CN109778120A (en) | 2019-03-14 | 2019-03-14 | Hydraulic valve rod and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109778120A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115302197A (en) * | 2022-07-29 | 2022-11-08 | 平高集团有限公司 | Valve rod manufacturing process and valve rod |
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|---|---|---|---|---|
| CN1784505A (en) * | 2003-03-10 | 2006-06-07 | 株式会社理研 | Nitrided valve lifter and producing method therefor |
| CN102268646A (en) * | 2011-06-21 | 2011-12-07 | 深圳开发磁记录股份有限公司 | Wear and corrosion resistant stainless steel gear and manufacturing method thereof |
| CN206986271U (en) * | 2017-04-07 | 2018-02-09 | 苏州星蓝纳米技术有限公司 | A kind of new CrN coatings |
| CN108698800A (en) * | 2016-02-16 | 2018-10-23 | 因温特奥股份公司 | The pulley and its manufacturing method with anti-friction coating for elevator |
| CN109023362A (en) * | 2018-07-09 | 2018-12-18 | 中国人民解放军空军勤务学院 | A kind of hydraulic valve stem surface impact-resistant abrasion-proof lubricates composite coating and preparation method thereof |
-
2019
- 2019-03-14 CN CN201910193019.5A patent/CN109778120A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1784505A (en) * | 2003-03-10 | 2006-06-07 | 株式会社理研 | Nitrided valve lifter and producing method therefor |
| CN102268646A (en) * | 2011-06-21 | 2011-12-07 | 深圳开发磁记录股份有限公司 | Wear and corrosion resistant stainless steel gear and manufacturing method thereof |
| CN108698800A (en) * | 2016-02-16 | 2018-10-23 | 因温特奥股份公司 | The pulley and its manufacturing method with anti-friction coating for elevator |
| CN206986271U (en) * | 2017-04-07 | 2018-02-09 | 苏州星蓝纳米技术有限公司 | A kind of new CrN coatings |
| CN109023362A (en) * | 2018-07-09 | 2018-12-18 | 中国人民解放军空军勤务学院 | A kind of hydraulic valve stem surface impact-resistant abrasion-proof lubricates composite coating and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115302197A (en) * | 2022-07-29 | 2022-11-08 | 平高集团有限公司 | Valve rod manufacturing process and valve rod |
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Application publication date: 20190521 |