CN109433550A - The tungsten carbide wear-resistant coating spraying process of oil cylinder - Google Patents
The tungsten carbide wear-resistant coating spraying process of oil cylinder Download PDFInfo
- Publication number
- CN109433550A CN109433550A CN201811547611.2A CN201811547611A CN109433550A CN 109433550 A CN109433550 A CN 109433550A CN 201811547611 A CN201811547611 A CN 201811547611A CN 109433550 A CN109433550 A CN 109433550A
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- oil cylinder
- turntable
- tungsten carbide
- matrix
- spraying process
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The present invention provides the tungsten carbide wear-resistant coating spraying process of oil cylinder, belongs to coating spraying field, the specific steps are step 1: preparation for the tungsten carbide wear-resistant coating spraying process of the oil cylinder；Step 2: bond coating is sprayed on oil cylinder；Step 3: bond coating on oil cylinder is removed；Step 4: oil cylinder matrix is purified, roughening treatment；Step 1: the surface of oil cylinder matrix is cleaned；Step 2: the outside to oil cylinder matrix carries out roughening treatment；Step 5: rotary spraying dedusting is carried out to oil cylinder matrix；Step 1: oil cylinder is placed on a spinstand；Step 2: using manually being rotated to turntable；Step 3: using supersonic spray coating equipment to its sprayed wc powder；It is dusted step 4: opening device for recovering powder in spraying process；Step 6: storage is completed.Present invention process is mature, can be avoided dust and falls to outside, and improves environment protecting, and work efficiency is high and can increase the hardness of oil cylinder matrix entirety.
Description
Technical field
The invention belongs to coating spraying technical field more particularly to the tungsten carbide wear-resistant coating spraying process of oil cylinder.
Background technique
Hydraulic cylinder is that hydraulic energy is changed into mechanical energy, the hydraulic of straight reciprocating motion (or pendulum motion) is done and executes member
Part.Its structure is simple, reliable operation.Deceleration device when realizing reciprocating motion, can be removed from it, and do not have drive gap,
Movement is steady, therefore is used widely in the hydraulic system of various machinery.Hydraulic cylinder power output and piston effective area and
The pressure difference on its both sides is directly proportional；Hydraulic cylinder substantially by cylinder barrel and cylinder cap, piston and piston rod, sealing device, buffer unit with
Exhaust apparatus composition.Depending on concrete application occasion, other devices are then essential for buffer unit and exhaust apparatus.
Hydraulic cylinder is the executive component in Hydraulic Power Transmission System, it is the energy converting means for hydraulic energy being converted into mechanical energy
It sets.Hydraulic motor is accomplished that continuous rotary moves, and what hydraulic cylinder was realized is then to move back and forth.The structural shape of hydraulic cylinder has
Piston cylinder, plunger case, oscillating cylinder three categories, piston cylinder and plunger case realize linear reciprocating motion, output speed and thrust, swing
Cylinder realizes reciprocally swinging, output angular velocity (revolving speed) and torque.Hydraulic cylinder, can be with two or more other than individually use
Ground combines or gets up to use with other Mechanism Combinations.To complete special function.Hydraulic cylinder structure is simple, reliable operation,
It is widely used in the hydraulic system of lathe.
The structure type of hydraulic cylinder is varied, classification method also there are many: linear reciprocation can be divided by motion mode
Campaign-styled and gyroscopic pendulum dynamic formula；Single-acting formula, double-acting type can be divided by by action of hydraulic force situation；It can be divided by structure type
Piston type, plunger type, multi-stage expansion are telescopic, pinion and-rack etc.；Pull rod, earrings, footing, hinged shaft can be divided by installation form
Deng；Pressing force grade can be divided into 16Mpa, 25Mpa, 31.5Mpa etc..
Prior art number of patent application CN201710128855.6 discloses a kind of wear-resistant coating spraying process, including step
It is rapid: to spray bond coating on matrix, and its turning is handled, guarantee that bond coating thickness is uniform；Eliminate bond coating stress；
Ceramic coated surface layer guarantees that spray distance is not less than 110mm；Above-mentioned spraying process passes through turning before ceramic coated surface layer
Mode makes bond coating each section consistency of thickness up and down, to avoid stress caused by thickness difference up and down excessive, then release is viscous
The stress for tying bottom avoids stress interaction between bottom and surface layer from influencing adhesion strength, finally, in ceramic coated surface layer
When, spray distance is not less than 110mm, to avoid interference of the other side to spray gun in double-layer structure, meanwhile, increase spraying away from
From on the one hand the variable quantity of spray angle can be reduced, using up spray angle can when spray gun is gradually moved into lower part from top
It can level off to 90 °, on the other hand can be effectively reduced spraying area temperature, prevent ceramic coating crackle.
But that there is effects of energy conservation and environmental protection is poor for existing oil cylinder spraying process, working efficiency is low and oil cylinder ontology
The problem of difference of hardness.
Therefore, the tungsten carbide wear-resistant coating spraying process of invention oil cylinder is very necessary.
Summary of the invention
In order to solve the above technical problem, the present invention provides the tungsten carbide wear-resistant coating spraying process of oil cylinder, existing to solve
The problem of that there is effects of energy conservation and environmental protection is poor for some oil cylinder spraying process, and working efficiency is low and the difference of hardness of oil cylinder ontology, oil
The tungsten carbide wear-resistant coating spraying process of cylinder specifically includes the following steps:
Step 1: preparation；
Step 1: arranging oil cylinder matrix, the oil cylinder matrix for choosing the required processing of processing is placed sequentially in the side of turntable；
Step 2: turntable is cleaned, manually the table top of turntable is cleaned using sponge brush；
Step 3: installation supersonic spray coating equipment and device for recovering powder, supersonic spray coating equipment and device for recovering powder point
Other bolt is mounted on the outside of turntable；
Step 2: spraying bond coating on oil cylinder, sprays bond coating on oil cylinder matrix using spray head；
Step 3: removing bond coating on oil cylinder, carries out turning to oil cylinder matrix, and guarantee that the thickness of oil cylinder matrix is uniform,
Bond coating on the upside of oil cylinder matrix is struck off simultaneously；
Step 4: oil cylinder matrix is purified, roughening treatment；
Step 1: the surface of oil cylinder matrix is cleaned, clast remaining on oil cylinder matrix is wiped using sponge brush；
Step 2: the outside to oil cylinder matrix carries out roughening treatment, in one layer of roughening agent of upper uniform smearing of oil cylinder pedestal；
Step 3: waiting to be painted, waited after smearing；
Step 5: rotary spraying dedusting is carried out to oil cylinder matrix；
Step 1: oil cylinder is placed on a spinstand, oil cylinder pedestal is installed in the upper middle position of turntable；
Step 2: using manually being rotated to turntable, makes manually to move turntable and be rotatably mounted on turntable
Oil cylinder pedestal；
Step 3: powering to supersonic spray coating equipment to its sprayed wc powder using supersonic spray coating equipment, making supersonic speed
Spraying equipment sprayed wc powder on oil cylinder pedestal in certain distance sprays 45 times to 55 times, the thickness of single spin
It is set as 0.01mm to 0.03mm, and tungsten carbide coating is 3 times to 5 times or more longer than the hard chrome plating wear-resistant time in practical applications；
It is dusted step 4: opening device for recovering powder in spraying process, gives device for recovering powder power supply, make it to spraying out
Extra tungsten-carbide powder is collected；
Step 6: completing storage, and the oil cylinder pedestal that spraying finishes is put into warehouse and is stored.
Preferably, in step 1, the first step, the diameter of the turntable is set as 180 centimetres to 220 centimetres；Institute
The upper middle position bolt for the turntable stated is equipped with four-jaw chuck；The turntable surrounding position also screw is installed
There is handle.
Preferably, in step 4, the 4th step, one layer of roughening agent thickness on the oil cylinder pedestal is set as 0.1mm
To 0.3mm.
Preferably, in step 5, third step, the certain distance is set as 90 centimetres to 110 centimetres.
Preferably, in step 5, third step, the certain distance is set as 90 centimetres to 100 centimetres.
Preferably, in step 5, third step, the spraying number is 50 times to 55 times.
Preferably, in step 5, third step, the spraying number is 50 times to 53 times.
Preferably, in step 5, third step, the thickness of the single spin is set as 0.015mm to 0.03mm.
Preferably, in step 5, third step, the thickness of the single spin is set as 0.02mm to 0.03mm.
Preferably, in step 5, third step, tungsten carbide coating is longer than the hard chrome plating wear-resistant time in the practical application
3 times to 4 times or more.
Preferably, in step 5, third step, tungsten carbide coating is longer than the hard chrome plating wear-resistant time in the practical application
3 times or more.
Preferably, in step 5, the 4th step, the device for recovering powder has exhaust fan, storage dirt bag and L-type mounting rack
Composition, the surrounding of turntable is arranged in the exhaust fan, and bolt is mounted on the top of L-type mounting rack；The storage dirt bag
It is socketed in the rear outside of exhaust fan；The outside of turntable is arranged in the L-type mounting rack, and in bolt installation over there.
Compared with prior art, the invention has the following beneficial effects: the carbine abrasion-proof paintings due to oil cylinder of the invention
Layer spraying process is widely used in coating spraying technical field.Present invention process is mature, can be avoided dust and falls to outside, and
Environment protecting is improved, work efficiency is high and can increase the hardness of oil cylinder matrix entirety.
Detailed description of the invention
Fig. 1 is the tungsten carbide wear-resistant coating spraying process flow chart of oil cylinder.
Fig. 2 is preparation flow chart.
Fig. 3 is purified to oil cylinder matrix, roughening treatment flow chart.
Fig. 4 is to carry out rotary spraying dedusting flow chart to oil cylinder matrix.
Specific embodiment
The present invention is described further below in conjunction with attached drawing:
In figure:
As shown in attached drawing 1 to attached drawing 4
The tungsten carbide wear-resistant coating spraying process of oil cylinder specifically includes the following steps:
S101: preparation；
S1011: arranging oil cylinder matrix, and the oil cylinder matrix for choosing the required processing of processing is placed sequentially in the side of turntable；
S1012: turntable is cleaned, and is manually cleaned using sponge brush to the table top of turntable；
S1013: installation supersonic spray coating equipment and device for recovering powder distinguish supersonic spray coating equipment and device for recovering powder
Bolt is mounted on the outside of turntable；
S102: spraying bond coating on oil cylinder, sprays bond coating on oil cylinder matrix using spray head；
S103: removing bond coating on oil cylinder, carries out turning to oil cylinder matrix, and guarantee that the thickness of oil cylinder matrix is uniform, together
When bond coating on the upside of oil cylinder matrix is struck off；
S104: oil cylinder matrix is purified, roughening treatment；
S401: the surface of oil cylinder matrix is cleaned, and is wiped using sponge brush clast remaining on oil cylinder matrix；
S402: roughening treatment is carried out to the outside of oil cylinder matrix, in one layer of roughening agent of upper uniform smearing of oil cylinder pedestal；
S403: waiting to be painted, is waited after smearing；
S105: rotary spraying dedusting is carried out to oil cylinder matrix；
S501: oil cylinder is placed on a spinstand, oil cylinder pedestal is installed in the upper middle position of turntable；
S502: using manually being rotated to turntable, make manually to move turntable and carry out the oil being rotatably mounted on turntable
Cylinder pedestal；
S503: it using supersonic spray coating equipment to its sprayed wc powder, powers to supersonic spray coating equipment, sprays supersonic speed
Automatic doubler surface glouer sprayed wc powder on oil cylinder pedestal in certain distance sprays 45 times to 55 times, and the thickness of single spin is set
It is set to 0.01mm to 0.03mm, and tungsten carbide coating is 3 times to 5 times or more longer than the hard chrome plating wear-resistant time in practical applications；
S504: device for recovering powder is opened in spraying process and is dusted, powers to device for recovering powder, keeps it more to spraying out
Remaining tungsten-carbide powder is collected；
S106: completing storage, and the oil cylinder pedestal that spraying finishes is put into warehouse and is stored.
In above-described embodiment, specifically, S1011, the diameter of the turntable is set as 180 centimetres extremely in S101
220 centimetres；The upper middle position bolt of the turntable is equipped with four-jaw chuck；The turntable surrounding position
Also screw is equipped with handle.
In above-described embodiment, specifically, in S104, S404, one layer of roughening agent thickness on the oil cylinder pedestal is set
0.1mm is set to 0.3mm.
In above-described embodiment, specifically, S503, the certain distance is set as 90 centimetres to 110 lis in S105
Rice.
In above-described embodiment, specifically, S503, the certain distance is set as 90 centimetres to 100 lis in S105
Rice.
In above-described embodiment, specifically, S503, the spraying number is 50 times to 55 times in S105.
In above-described embodiment, specifically, S503, the spraying number is 50 times to 53 times in S105.
In above-described embodiment, specifically, S503, the thickness of the single spin is set as 0.015mm extremely in S105
0.03mm。
In above-described embodiment, specifically, S503, the thickness of the single spin is set as 0.02mm extremely in S105
0.03mm。
In above-described embodiment, specifically, in S105, S503, tungsten carbide coating is than plating hard chrome in the practical application
3 times to 4 times of wear time length or more.
In above-described embodiment, specifically, in S105, S503, tungsten carbide coating is than plating hard chrome in the practical application
3 times of wear time length or more.
In above-described embodiment, specifically, in S105, S504, the device for recovering powder have exhaust fan, storage dirt bag and
L-type mounting rack composition, the surrounding of turntable is arranged in the exhaust fan, and bolt is mounted on the top of L-type mounting rack；It is described
Storage dirt bag be socketed in the rear outside of exhaust fan；The outside of turntable is arranged in the L-type mounting rack, and bolt is mounted on
On opposite.
Example is embodied
Embodiment 1: the oil cylinder matrix for choosing the required processing of processing is placed sequentially in the side of turntable, and the diameter of turntable is set
180 centimetres to 220 centimetres are set to, and upper middle position bolt is equipped with four-jaw chuck, while in surrounding position also spiral shell
Nail is equipped with handle, is manually cleaned using sponge brush to the table top of turntable, supersonic spray coating equipment and device for recovering powder
Bolt is mounted on the outside of turntable respectively, sprays bond coating on oil cylinder matrix using spray head, carries out vehicle to oil cylinder matrix
It cuts, and guarantees that the degree of oil cylinder matrix thickness is uniform, while bond coating on the upside of oil cylinder matrix being struck off, using sponge brush to oil cylinder base
Remaining clast is wiped on body, is that thickness is set as 0.1mm to 0.3mm in upper uniform smearing a layer thickness of oil cylinder pedestal
Roughening agent, waited after smearing, oil cylinder pedestal is installed in the upper middle position of turntable, makes manually to move rotation
Turntable carries out the oil cylinder pedestal being rotatably mounted on turntable, powers to supersonic spray coating equipment, supersonic spray coating equipment is made to exist
90 centimetres in 110 cm distances on oil cylinder pedestal sprayed wc powder, spray 45 times to 55 times, the thickness of single spin
It is set as 0.01mm to 0.03mm, and tungsten carbide coating is 3 times to 5 times or more longer than the hard chrome plating wear-resistant time in practical applications,
It powers to exhaust fan, extracts it to extra tungsten-carbide powder is sprayed out, and dust is drawn into storage dirt bag, will spray
The oil cylinder pedestal that painting finishes, which is put into warehouse, to be stored.
Embodiment 2: the oil cylinder matrix for choosing the required processing of processing is placed sequentially in the side of turntable, turntable it is straight
Diameter is set as 180 centimetres to 220 centimetres, and upper middle position bolt is equipped with four-jaw chuck, while in surrounding position
Also screw is equipped with handle, is manually cleaned using sponge brush to the table top of turntable, and supersonic spray coating equipment and dust are recycled
Bolt is mounted on the outside of turntable to device respectively, sprays bond coating on oil cylinder matrix using spray head, to oil cylinder matrix into
Driving is cut, and guarantees that the degree of oil cylinder matrix thickness is uniform, while bond coating on the upside of oil cylinder matrix being struck off, using sponge brush to oil
Remaining clast is wiped on cylinder matrix, is that thickness is set as 0.2mm extremely in upper uniform smearing a layer thickness of oil cylinder pedestal
The roughening agent of 0.3mm is waited after smearing, and oil cylinder pedestal is installed in the upper middle position of turntable, is made artificial
The oil cylinder pedestal that turntable be rotatably mounted on turntable is moved, powers to supersonic spray coating equipment, makes supersonic spray coating
Equipment sprayed wc powder on oil cylinder pedestal in 90 centimetres to 100 cm distances sprays 50 times to 55 times, single spin
Thickness be set as 0.015mm to 0.03mm, and tungsten carbide coating is 3 times to 4 longer than the hard chrome plating wear-resistant time in practical applications
Times or more, it powers to exhaust fan, extracts it to extra tungsten-carbide powder is sprayed out, and dust is drawn into storage dirt bag
It is interior, the oil cylinder pedestal that spraying finishes is put into warehouse and is stored.
Embodiment 3: the oil cylinder matrix for choosing the required processing of processing is placed sequentially in the side of turntable, turntable it is straight
Diameter is set as 180 centimetres to 220 centimetres, and upper middle position bolt is equipped with four-jaw chuck, while in surrounding position
Also screw is equipped with handle, is manually cleaned using sponge brush to the table top of turntable, and supersonic spray coating equipment and dust are recycled
Bolt is mounted on the outside of turntable to device respectively, sprays bond coating on oil cylinder matrix using spray head, to oil cylinder matrix into
Driving is cut, and guarantees that the degree of oil cylinder matrix thickness is uniform, while bond coating on the upside of oil cylinder matrix being struck off, using sponge brush to oil
Remaining clast is wiped on cylinder matrix, is that thickness is set as 0.2mm's in upper uniform smearing a layer thickness of oil cylinder pedestal
It is roughened agent, is waited after smearing, oil cylinder pedestal is installed in the upper middle position of turntable, makes manually to move rotation
Platform carries out the oil cylinder pedestal being rotatably mounted on turntable, powers to supersonic spray coating equipment, makes supersonic spray coating equipment 90
The interior sprayed wc powder on oil cylinder pedestal of cm distance, sprays 50 times to 53 times, the thickness of single spin is set as
0.02mm to 0.03mm, and 3 times longer than the hard chrome plating wear-resistant time of tungsten carbide coating or more in practical applications, it is supplied to exhaust fan
Electricity extracts it to extra tungsten-carbide powder is sprayed out, and dust is drawn into storage dirt bag, the oil that spraying is finished
Cylinder pedestal, which is put into warehouse, to be stored.
Using technical solutions according to the invention or those skilled in the art under the inspiration of technical solution of the present invention,
Similar technical solution is designed, and reaches above-mentioned technical effect, is to fall into protection scope of the present invention.
Claims (10)
1. the tungsten carbide wear-resistant coating spraying process of oil cylinder, which is characterized in that the tungsten carbide wear-resistant coating of this kind of oil cylinder sprays work
Skill specifically includes the following steps:
Step 1: preparation；
Step 1: arranging oil cylinder matrix, the oil cylinder matrix for choosing the required processing of processing is placed sequentially in the side of turntable；
Step 2: turntable is cleaned, manually the table top of turntable is cleaned using sponge brush；
Step 3: installation supersonic spray coating equipment and device for recovering powder, supersonic spray coating equipment and device for recovering powder point
Other bolt is mounted on the outside of turntable；
Step 2: spraying bond coating on oil cylinder, sprays bond coating on oil cylinder matrix using spray head；
Step 3: removing bond coating on oil cylinder, carries out turning to oil cylinder matrix, and guarantee that the thickness of oil cylinder matrix is uniform,
Bond coating on the upside of oil cylinder matrix is struck off simultaneously；
Step 4: oil cylinder matrix is purified, roughening treatment；
Step 1: the surface of oil cylinder matrix is cleaned, clast remaining on oil cylinder matrix is wiped using sponge brush；
Step 2: the outside to oil cylinder matrix carries out roughening treatment, in one layer of roughening agent of upper uniform smearing of oil cylinder pedestal；
Step 3: waiting to be painted, waited after smearing；
Step 5: rotary spraying dedusting is carried out to oil cylinder matrix；
Step 1: oil cylinder is placed on a spinstand, oil cylinder pedestal is installed in the upper middle position of turntable；
Step 2: using manually being rotated to turntable, makes manually to move turntable and be rotatably mounted on turntable
Oil cylinder pedestal；
Step 3: powering to supersonic spray coating equipment to its sprayed wc powder using supersonic spray coating equipment, making supersonic speed
Spraying equipment sprayed wc powder on oil cylinder pedestal in certain distance sprays 45 times to 55 times, the thickness of single spin
0.01mm is set as to 0.03mm；
It is dusted step 4: opening device for recovering powder in spraying process, gives device for recovering powder power supply, make it to spraying out
Extra tungsten-carbide powder is collected；
Step 6: completing storage, and the oil cylinder pedestal that spraying finishes is put into warehouse and is stored.
2. the tungsten carbide wear-resistant coating spraying process of oil cylinder as described in claim 1, which is characterized in that in step 1, the
One step, the diameter of the turntable are set as 180 centimetres to 220 centimetres；The upper middle position bolt of the turntable
Four-jaw chuck is installed；The turntable surrounding position also screw is equipped with handle.
3. the tungsten carbide wear-resistant coating spraying process of oil cylinder as described in claim 1, which is characterized in that in step 5, the
Three steps, the spraying number are 50 times to 55 times.
4. the tungsten carbide wear-resistant coating spraying process of oil cylinder as described in claim 1, which is characterized in that in step 5, the
Three steps, the spraying number are 50 times to 53 times.
5. the tungsten carbide wear-resistant coating spraying process of oil cylinder as described in claim 1, which is characterized in that in step 5, the
Three steps, the thickness of the single spin are set as 0.015mm to 0.03mm.
6. the tungsten carbide wear-resistant coating spraying process of oil cylinder as described in claim 1, which is characterized in that in step 5, the
Three steps, the thickness of the single spin are set as 0.02mm to 0.03mm.
7. the tungsten carbide wear-resistant coating spraying process of oil cylinder as described in claim 1, which is characterized in that in step 5, the
Three steps, tungsten carbide coating is 3 times to 4 times or more longer than the hard chrome plating wear-resistant time in the practical application.
8. the tungsten carbide wear-resistant coating spraying process of oil cylinder as described in claim 1, which is characterized in that in step 5, the
Three steps, 3 times longer than the hard chrome plating wear-resistant time of tungsten carbide coating or more in the practical application.
9. the tungsten carbide wear-resistant coating spraying process of oil cylinder as described in claim 1, which is characterized in that in step 5, the
Three steps, the certain distance are set as 90 centimetres to 100 centimetres.
10. the tungsten carbide wear-resistant coating spraying process of oil cylinder as described in claim 1, which is characterized in that in step 5, the
Four steps, the device for recovering powder are made of exhaust fan, storage dirt bag and L-type mounting rack, and the exhaust fan setting is rotating
The surrounding of platform, and bolt is mounted on the top of L-type mounting rack；The storage dirt bag is socketed in the rear outside of exhaust fan；It is described
L-type mounting rack the outside of turntable is set, and in bolt installation over there.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811547611.2A CN109433550A (en) | 2018-12-18 | 2018-12-18 | The tungsten carbide wear-resistant coating spraying process of oil cylinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811547611.2A CN109433550A (en) | 2018-12-18 | 2018-12-18 | The tungsten carbide wear-resistant coating spraying process of oil cylinder |
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ID=65558809
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Application publication date: 20190308 |