CN108050131A - A kind of cylinder piston rod and its manufacturing method - Google Patents
A kind of cylinder piston rod and its manufacturing method Download PDFInfo
- Publication number
- CN108050131A CN108050131A CN201711415167.4A CN201711415167A CN108050131A CN 108050131 A CN108050131 A CN 108050131A CN 201711415167 A CN201711415167 A CN 201711415167A CN 108050131 A CN108050131 A CN 108050131A
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- CN
- China
- Prior art keywords
- piston rod
- layer
- cylinder piston
- nitriding
- main body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1485—Special measures for cooling or heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2215/00—Fluid-actuated devices for displacing a member from one position to another
- F15B2215/30—Constructional details thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
A kind of cylinder piston rod that the present invention designs,Including cylinder piston rod main body,Further include the strengthening layer for being arranged on cylinder piston rod body surfaces,Strengthening layer includes nitriding steel layer,It is arranged on the nitriding layer of nitrided steel layer surface and the composite coating being attached to outside nitriding layer,Composite coating includes at least protective layer and lubricant layer,The material of piston rod is used as by 40Cr the 20CrMnTi quenched and tempered steel of screening,It can ensure better plasticity and toughness,During piston rod reciprocal impact,With the more preferably service life,Piston rod one layer of nitrated steel of outer layer covers and carry out Nitrizing Treatment,It can either ensure the intensity and hardness requirement of piston rod outer surface,Cost can also be reduced as far as possible,Reduce energy consumption,To reach the optimal performance of piston rod,The lubricant layer being conveniently replaceable,It can either ensure the lubricant effect of outer surface of piston,The replacement passively alarmed can ensure the service life of cylinder,The service life of piston rod is greatly improved by simply replacing lubricant layer.
Description
Technical field
The present invention relates to a kind of cylinder piston rod design field more particularly to a kind of cylinder piston rod and its manufacturers
Method.
Background technology
At present, the structure of pneumatic cylinder piston rod is provided only with anti-gas-leak design and wearability design, in the mistake of assembling pneumatic cylinder
Cheng Zhong can smear one layer of lube layer, in pneumatic cylinder inboard wall of cylinder block by lubricating oil piston in the process of reciprocating
The frictional heat generated between piston and cylinder inner wall is reduced, piston and anti-gas-leak structure are avoided damage to, to extend making for pneumatic cylinder
With the service life, but the service life of piston rod then needs to carry out surface Hardening Treatment can to ensure the service life of piston rod.
Patent publication No. is that the patent of invention composite coating piston rod of CN103775634B and its manufacturing method disclose one
Kind composite coating piston rod and its manufacturing method, are related to air compressor piston-rod field, provide a kind of with high surface hardness
Composite coating piston rod and its manufacturing method.Composite coating piston rod includes piston rod main body, and piston rod body surfaces are to ooze
Nitrogen layer, nitriding layer are attached with composite coating outside, and composite coating is followed successively by metal back layer, hard coat and solid lubrication from inside to outside
Surface layer makes piston rod surface possess the advantages that high rigidity, high-wearing feature and low-friction coefficient, while each coating is firmly combined with, no
It is easy to fall off, greatly improve piston rod service life.
A kind of cylinder piston rod and its manufacturing method that the present invention designs are directed to documents, have by core design
Good plasticity and toughness have been taken into account while the quenched and tempered steel of good comprehensive mechanical property, has been used integrally compared in documents
For the 38CrMoAl nitrated steels of formula, cost reduction, then while ensure case hardness and intensity, the plasticity toughness of core is excellent
In documents so that there are many cylinder piston rod overall qualities progress, have good positive effect.
The content of the invention
A kind of cylinder piston rod that the present invention designs, including cylinder piston rod main body, it is characterised in that：It further includes and is arranged on
The strengthening layer of the cylinder piston rod body surfaces, the strengthening layer include nitriding steel layer, are arranged on the nitrided steel layer surface
Nitriding layer and the composite coating that is attached to outside the nitriding layer, the composite coating include at least protective layer and lubrication
Layer.
Multi-functional material reinforcing layer has outwards been sequentially formed from the cylinder piston rod main body as a result, has formd inside
Plasticity toughness is high, appearance surface intensity cylinder piston rod with high hardness, improves quality and the service life of cylinder piston rod, by by institute
The strengthening layer for stating nitriding steel layer progress Nitrizing Treatment formation surface protects the cylinder piston rod main body, the protective layer
Design play crucial effect for the anti-corrosion protection for a long time in the cylinder piston rod of cylinder interior, lubricant layer can reduce
The formation of heat avoids the loss of energy, and what is finally wanted is the service life for extending cylinder piston rod.
As a preference of the present invention, the cylinder piston rod material of main part is 45,40Cr, 20CrMnTi and 20MnTiB etc..
As a result, the material of quenched and tempered steel have good comprehensive mechanical property, larger working stress can be born, prevent by
The damage caused by the accidental causes such as unexpected overload, No. 45 steel and 40Cr steel are at low cost but meet requirement, 20CrMnTi
With 20MnTi plasticity and good toughness, metallicity is strong, can be as the selection scheme of the present invention.
As a preference of the present invention, the nitrided steel layer material is 38CrMoAl, thickness is more than or equal to 1mm.
Thereby, it is possible to ensure Nitrizing Treatment to need thickness.
As a preference of the present invention, the protective layer material is that at least the metal layer containing Cr, Si and Ni, thickness are
200nm~300nm。
The presence of Cr, Si and Ni can ensure corrosion resistance and hardness of the piston rod in cylinder interior as a result,.
As a preference of the present invention, further include the cylinder piston being connected with described cylinder piston rod main body one end.
As the preferred of this practicality, the lubricant layer include be opened in the lubricant layer outer round surface oil outlet and with institute
The oil storage tank of oil outlet connection is stated, the lubricant layer is socketed on the cylinder piston.
The lubricant layer is wear-resistant material as a result, and the lubricant layer is socketed on the cylinder piston, when the oil storage tank
Interior lubrication oil consumption totally after, the frictional force of the lubricant layer and cylinder inner wall increase, frictional dissipation increases, and carries out replacement institute
Lubricant layer is stated, is so cycled, ensures that the service life of cylinder entirety lengthens, it can be cost-effective.
Another technical problem to be solved by the present invention is that：A kind of cylinder piston rod manufacturing method is provided.
In order to solve the above problem the technical solution adopted is that：A kind of cylinder piston rod manufacturing method includes the following steps：
A, progress blanking, forging, normalizing, roughing, quenched or quenching twice add lonneal, finishing and finishing operations,
Complete the processing of the cylinder piston rod body shape；
B, the cylinder piston rod body surfaces are carried out with one layer of nitriding steel layer of cast；
C, the cylinder piston rod main body that the nitriding steel layer is connected with to surface carries out surface carburization processing so that described
Nitriding steel layer outer surface forms nitriding layer；
D, using vapour deposition process the nitriding layer surface attachment is caused to have the protective layer；
E, it is socketed the lubricant layer in the piston of the cylinder piston rod main body.
As a preference of the present invention, in step B, the cylinder piston rod main body is put into casting mold, carries out high temperature
Nitrided steel liquid castable.
As a preference of the present invention, in step B, Ni, V, Ti, W and Si element are added in before cast in nitrided steel, reinforcing is oozed
Nitrogen effect.
As a preference of the present invention, in step C, Nitrizing Treatment method is gas nitriding processing, nitriding temperature for 520 DEG C ~
Between 580 DEG C, for soaking time between 70h ~ 100h, the nitrided case depth is 0.4mm ~ 0.6mm.
The invention has the advantages that：
A kind of cylinder piston rod provided by the invention and its manufacturing method are made by 40Cr the 20CrMnTi quenched and tempered steel of screening
It for the material of piston rod, can ensure better plasticity and toughness, during piston rod reciprocal impact, have more preferably
Service life, piston rod one layer of nitrated steel of outer layer covers and carry out Nitrizing Treatment, can either ensure the strong of piston rod outer surface
Degree and hardness requirement, additionally it is possible to reduce cost as far as possible, energy consumption be reduced, to reach the optimal performance of piston rod, in nitriding layer
Outside Vapor deposition is high by quenching degree such as Cr, Si and Ni and alloying element that anti-corrosion capability is strong, improve piston rod and working
Anti-corrosion capability in the process ensures its service life, and Ni and Si make its solution strengthening, and the addition of Cr and Cu can be in surface shapes
Into fine and close protective oxide layer, metal surface and corrosive medium are separated, so as to greatly improve the corrosion resistance of piston rod,
The lubricant layer being conveniently replaceable, can either ensure the lubricant effect of outer surface of piston, and the replacement passively alarmed can ensure gas
The service life of cylinder greatly improves the service life of piston rod by simply replacing lubricant layer.
Below by drawings and examples, technical scheme is described in further detail.
Description of the drawings
Fig. 1 is a kind of structure diagram of cylinder piston rod of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with attached drawing.
As shown in Figure 1, a kind of cylinder piston rod that the present invention designs, including cylinder piston rod main body 1, it is characterised in that：
The strengthening layer 2 for being arranged on 1 surface of cylinder piston rod main body is further included, the strengthening layer 2 includes nitriding steel layer 21, is arranged on
The nitriding layer 22 on 21 surface of nitriding steel layer and the composite coating 3 being attached to outside the nitriding layer 22, the compound painting
Layer 3 includes at least protective layer 31 and lubricant layer 32, and outwards multi-functional material has been sequentially formed from the cylinder piston rod main body 1
Strengthening layer, it is high to form internal plasticity toughness, appearance surface intensity cylinder piston rod with high hardness, improves the matter of cylinder piston rod
Amount and service life form the strengthening layer on surface to the cylinder piston rod main body by the way that the nitriding steel layer 21 is carried out Nitrizing Treatment
1 is protected, and the design of the protective layer 31 plays pass for the anti-corrosion protection for a long time in the cylinder piston rod of cylinder interior
The effect of key, lubricant layer 32 can reduce the formation of heat, avoid the loss of energy, and what is finally wanted is to extend cylinder piston rod
Service life, 1 material of cylinder piston rod main body are 45,40Cr, 20CrMnTi and 20MnTiB etc., and the material of quenched and tempered steel is with good
Good comprehensive mechanical property, can bear larger working stress, prevent damage caused by due to the accidental causes such as overloading suddenly,
No. 45 steel and 40Cr steel are at low cost but meet requirement, 20CrMnTi and 20MnTi plasticity and good toughness, metallicity is strong,
Can be as the selection scheme of the present invention, 21 material of nitriding steel layer is 38CrMoAl, and thickness is more than or equal to 1mm, can
Ensure Nitrizing Treatment needs thickness, and 31 material of protective layer is that at least the metal layer containing Cr, Si and Ni, thickness are
The presence of 200nm ~ 300nm, Cr, Si and Ni can ensure corrosion resistance and hardness of the piston rod in cylinder interior, further include
The cylinder piston 4 being connected with described 1 one end of cylinder piston rod main body, the lubricant layer 32 include being opened in outside the lubricant layer 32
The oil outlet 321 of circular surfaces and the oil storage tank 322 being connected with the oil outlet, the lubricant layer 32 are socketed in the cylinder piston
On 4, the lubricant layer 32 is wear-resistant material, and the lubricant layer 32 is socketed on the cylinder piston 4, when the oil storage tank 322
Interior lubrication oil consumption totally after, the frictional force of the lubricant layer 32 and cylinder inner wall increases, and frictional dissipation increases, and is replaced
The lubricant layer 32 so cycles, and ensures that the service life of cylinder entirety lengthens, can be cost-effective.
Another technical problem to be solved by the present invention is that：A kind of cylinder piston rod manufacturing method is provided.
In order to solve the above problem the technical solution adopted is that：A kind of cylinder piston rod manufacturing method includes the following steps：
A, progress blanking, forging, normalizing, roughing, quenched or quenching twice add lonneal, finishing and finishing operations,
Complete the processing of 1 shape of cylinder piston rod main body；
B, one layer of nitriding steel layer 21 of cast is carried out to 1 surface of cylinder piston rod main body；
C, the cylinder piston rod main body 1 that the nitriding steel layer 21 is connected with to surface carries out surface carburization processing so that institute
It states 21 outer surface of nitriding steel layer and forms nitriding layer 22；
D, using vapour deposition process 22 surface attachment of nitriding layer is caused to have the protective layer 2；
E, it is socketed the lubricant layer 32 in the piston of the cylinder piston rod main body 1.
In step B, the cylinder piston rod main body 1 is put into casting mold, carries out the nitrided steel liquid castable of high temperature.
In step B, Ni, V, Ti, W and Si element are added in before cast in nitrided steel, strengthens nitrogenizing effect.
In step C, Nitrizing Treatment method is handled for gas nitriding, between nitriding temperature is 520 DEG C ~ 580 DEG C, soaking time
Between 70h ~ 100h, 22 thickness of nitriding layer is 0.4mm ~ 0.6mm.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the design of the present invention
It is defined with scope.On the premise of design concept of the present invention is not departed from, ordinary people in the field is to the technical side of the present invention
The all variations and modifications that case is made, should all drop into protection scope of the present invention, the claimed technology contents of the present invention,
Through all recording in detail in the claims.
Claims (10)
1. a kind of cylinder piston rod, including cylinder piston rod main body（1）, it is characterised in that：It further includes and is arranged on the cylinder work
Stopper rod body（1）The strengthening layer on surface（2）, the strengthening layer（2）Including nitriding steel layer（21）, be arranged on the nitriding steel layer
（21）The nitriding layer on surface（22）And it is attached to the nitriding layer（22）External composite coating（3）, the composite coating（3）
Including at least protective layer（31）And lubricant layer（32）.
2. a kind of cylinder piston rod according to claim 1, it is characterised in that：The cylinder piston rod main body（1）Material
For 45,40Cr, 20CrMnTi and 20MnTiB etc..
3. a kind of cylinder piston rod according to claim 1, it is characterised in that：The nitriding steel layer（21）Material is
38CrMoAl, thickness are more than or equal to 1mm.
4. a kind of cylinder piston rod according to claim 1, it is characterised in that：The protective layer（31）Material is at least to contain
There are the metal layer of Cr, Si and Ni, thickness is 200nm ~ 300nm.
5. a kind of cylinder piston rod according to claim 1, it is characterised in that：It further includes and the cylinder piston rod main body
（1）The cylinder piston of one end connection（4）.
6. according to a kind of cylinder piston rod described in claim 1 and 5, it is characterised in that：The lubricant layer（32）Including opening up
In the lubricant layer（32）The oil outlet of outer round surface（321）The oil storage tank being connected with the oil outlet（322）, the lubrication
Layer（32）It is socketed in the cylinder piston（4）On.
7. a kind of cylinder piston rod manufacturing method, including at least following steps：
Progress blanking, forging, normalizing, roughing, quenched or quenching twice add lonneal, finishing and finishing operations, complete
Into the cylinder piston rod main body（1）The processing of shape；
To the cylinder piston rod main body（1）Surface carries out one layer of nitriding steel layer of cast（21）；
The nitriding steel layer is connected with to surface（21）The cylinder piston rod main body（1）Carry out surface carburization processing so that
The nitriding steel layer（21）Outer surface forms nitriding layer（22）.
8. a kind of cylinder piston rod manufacturing method according to claim 6, it is characterised in that：In step B, by the cylinder
Piston rod main body（1）It is put into casting mold, carries out the nitrided steel liquid castable of high temperature.
9. a kind of cylinder piston rod manufacturing method according to claim 6, it is characterised in that：In step B, oozed before cast
Ni, V, Ti, W and Si element are added in nitrogen steel, strengthens nitrogenizing effect.
10. a kind of cylinder piston rod manufacturing method according to claim 6, it is characterised in that：In step C, Nitrizing Treatment
Method is handled for gas nitriding, and between nitriding temperature is 520 DEG C ~ 580 DEG C, soaking time is between 70h ~ 100h, the nitriding
Layer（22）Thickness is 0.4mm ~ 0.6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711415167.4A CN108050131A (en) | 2017-12-25 | 2017-12-25 | A kind of cylinder piston rod and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711415167.4A CN108050131A (en) | 2017-12-25 | 2017-12-25 | A kind of cylinder piston rod and its manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108050131A true CN108050131A (en) | 2018-05-18 |
Family
ID=62130951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711415167.4A Pending CN108050131A (en) | 2017-12-25 | 2017-12-25 | A kind of cylinder piston rod and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108050131A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2895027Y (en) * | 2005-11-24 | 2007-05-02 | 徐明良 | Bimetallic charging basket |
| US20090255400A1 (en) * | 2008-04-14 | 2009-10-15 | Polygon Company | Hybrid Piston Rod |
| JP2010037616A (en) * | 2008-08-07 | 2010-02-18 | Air Water Inc | Surface treatment method for steel, steel obtained thereby and die |
| CN102286726A (en) * | 2011-07-21 | 2011-12-21 | 中国第一汽车股份有限公司 | Surface wear-resistance coating applied to automobile ordinary carbon steel movement friction pair |
| CN102384266A (en) * | 2011-10-21 | 2012-03-21 | 贵阳白云高原紧固件有限公司 | Multifunctional crown block piston rod |
| CN103775634A (en) * | 2014-02-21 | 2014-05-07 | 四川金星压缩机制造有限公司 | Composite coating piston rod and manufacturing method thereof |
| CN204942521U (en) * | 2015-06-30 | 2016-01-06 | 浙江飞挺机械有限公司 | A kind of oil cylinder piston |
| CN105234638A (en) * | 2015-11-11 | 2016-01-13 | 鲁一军 | Piston rod processing technology |
-
2017
- 2017-12-25 CN CN201711415167.4A patent/CN108050131A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2895027Y (en) * | 2005-11-24 | 2007-05-02 | 徐明良 | Bimetallic charging basket |
| US20090255400A1 (en) * | 2008-04-14 | 2009-10-15 | Polygon Company | Hybrid Piston Rod |
| JP2010037616A (en) * | 2008-08-07 | 2010-02-18 | Air Water Inc | Surface treatment method for steel, steel obtained thereby and die |
| CN102286726A (en) * | 2011-07-21 | 2011-12-21 | 中国第一汽车股份有限公司 | Surface wear-resistance coating applied to automobile ordinary carbon steel movement friction pair |
| CN102384266A (en) * | 2011-10-21 | 2012-03-21 | 贵阳白云高原紧固件有限公司 | Multifunctional crown block piston rod |
| CN103775634A (en) * | 2014-02-21 | 2014-05-07 | 四川金星压缩机制造有限公司 | Composite coating piston rod and manufacturing method thereof |
| CN204942521U (en) * | 2015-06-30 | 2016-01-06 | 浙江飞挺机械有限公司 | A kind of oil cylinder piston |
| CN105234638A (en) * | 2015-11-11 | 2016-01-13 | 鲁一军 | Piston rod processing technology |
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Application publication date: 20180518 |
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| RJ01 | Rejection of invention patent application after publication |