CN116334620A - High-speed laser cladding method for drill rod of rotary drilling rig - Google Patents
High-speed laser cladding method for drill rod of rotary drilling rig Download PDFInfo
- Publication number
- CN116334620A CN116334620A CN202310344174.9A CN202310344174A CN116334620A CN 116334620 A CN116334620 A CN 116334620A CN 202310344174 A CN202310344174 A CN 202310344174A CN 116334620 A CN116334620 A CN 116334620A
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- China
- Prior art keywords
- drill rod
- drilling rig
- rotary drilling
- cladding
- laser cladding
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- 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.)
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- 238000004372 laser cladding Methods 0.000 title claims abstract description 40
- 238000005553 drilling Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005253 cladding Methods 0.000 claims abstract description 35
- 238000000576 coating method Methods 0.000 claims abstract description 29
- 239000011248 coating agent Substances 0.000 claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 21
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 239000011159 matrix material Substances 0.000 claims abstract description 15
- 238000007781 pre-processing Methods 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 5
- 238000005422 blasting Methods 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- 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
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a high-speed laser cladding method for a drill rod of a rotary drilling rig, which comprises the following steps of: step 1, preprocessing the surface of a substrate to be clad; step 2, preparing cladding powder; step 3, laser cladding: the powder is intersected and melted with the laser above the matrix to form a cladding coating on the surface of the matrix; step 4: the matrix is welded on the drill rod of the rotary drilling rig. The invention solves the problems of high cost, quick failure and easy cracking of the drill rod of the existing rotary drilling rig, and the high-speed laser cladding method has little influence on the surface tissue of the matrix, thereby greatly prolonging the service life of the drill rod.
Description
Technical Field
The invention relates to the field of piling machinery equipment, in particular to a telescopic drill rod of a rotary drilling rig, and especially relates to a high-speed laser cladding method for the drill rod of the rotary drilling rig.
Background
The drill rod of the rotary drilling rig is a main working device of the rotary drilling rig, in the construction process, the rotary drilling rig transmits torque and pressurizing force through a power head and a pressure-bearing locking block and a key bar on the drill rod, so that the function of pressurizing, rotating and taking soil is realized, the power head can be worn with the pressure-bearing locking block, the key bar and other stress components of the drill rod during drilling, the wearing speed is increased during hard rock working conditions, the pipe body of the drill rod is easily cracked or even broken by extrusion force due to wearing failure of the pressure-bearing locking block and the key bar, the maintenance of the drill rod can cause larger economic loss, project construction period is influenced, the requirement for ultra-large-diameter ultra-deep piles in China is increased, and the requirement for high reliability of the drill rod is also provided.
At present, the measure for enhancing the wear resistance of the drill rod is mainly to use high-strength wear-resistant plate for heat treatment to enhance the hardness, the mode has higher cost, the hardness is limited by raw materials and welding performance, the hardness often cannot meet the requirements, and a low-cost high-wear-resistant solution is not available in the current market.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a technique that is less costly, does not affect welding, and can greatly improve wear resistance.
The invention provides a high-speed laser cladding method for a drill rod of a rotary drilling rig, which is specifically to prepare high-wear-resistant coating materials such as Ni base, fe base and the like, cladding a wear-resistant belt on the surface of a stress member of the drill rod by adopting the high-speed laser cladding method, welding the stress member of the drill rod after cladding on the drill rod, improving the wear resistance and the service life of the drill rod, and comprises the following steps:
a high-speed laser cladding method for a drill rod of a rotary drilling rig comprises the following steps:
step 4: and welding the matrix on a drill rod of the rotary drilling rig.
Preferably, the matrix is one or more of a pressure-bearing locking block, a driving key or a key bar of a drill rod of the rotary drilling rig.
Preferably, after the 3 substrates are clad, the clad parts are welded on the drill rod of the rotary drilling rig uniformly in circumference after cladding, the clad coatings of the pressure-bearing locking blocks and the driving keys are positioned on the same surface, and the clad coatings of the key bars are uniformly distributed in circumference so as to uniformly stress the drill rod.
Preferably, in step 1, the substrate is heat-treated in advance to enhance the hardness of the substrate.
Preferably, the pretreatment cleans the surface by shot blasting or mechanical sanding.
Preferably, the cladding powder is a highly wear resistant coating material.
Preferably, the laser cladding equipment adopts a fiber laser, the power is 3000-4000W, the powder feeding speed is 8-12r/min, and the linear speed is 60-70mm/s.
Preferably, the thickness of the cladding coating after cladding is 3+/-0.5 mm, and the hardness is more than or equal to 60HRC.
The invention has the following advantages:
the invention relates to a method for reinforcing a rotary drilling rig drill rod by high-speed laser cladding, which ensures that powder is converged with laser above a workpiece by the high-speed laser cladding, and greatly shortens the powder melting time, so that the cladding efficiency is improved in a multiplied way, the thermal influence of a coating cladding on the surface of a substrate on the substrate is less, the surface appearance of the coating is smoother, and the stress of the substrate in the working process is facilitated. The method for reinforcing the drill rod of the rotary drilling rig by high-speed laser cladding is applied to non-welding areas of the base bodies such as the pressure-bearing locking blocks and the key bars of the drill rod, does not influence subsequent welding of the base bodies, has low cost compared with the method for changing the materials of the base bodies, has better short-term abrasion resistance effect than the former, and greatly improves early-stage excessively rapid abrasion.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic view of a rotary drilling rig drill pipe;
FIG. 2 is a schematic view of a drill rod pressure-bearing lock block of the rotary drilling rig;
FIG. 3 is a schematic diagram of the stressed surface of the pressure-bearing lock block after cladding;
FIGS. 4-5 are graphs of hardness partition test results;
fig. 6-7 are wear resistance improvement tests based on pin disc wear tests.
In the figure: 1-drill rod of rotary drilling rig, 2-drill rod pressure-bearing locking block, 3-surface to be clad and 4-cladding coating.
Description of the embodiments
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
A high-speed laser cladding method for a drill rod of a rotary drilling rig comprises the following steps:
and 1, preprocessing the surface of a substrate (to-be-clad piece). Specifically, the hardness of the matrix is enhanced by heat treatment. The surface is purified by shot blasting or mechanical sanding.
And 2, preparing cladding powder. The cladding powder is a high wear-resistant coating material such as Ni-based, fe-based and the like.
The laser cladding equipment adopts an optical fiber laser with the power of 3000-4000W, the powder feeding speed of 8-12r/min and the linear speed of 60-70mm/s.
The thickness of the cladding coating after cladding is 3+/-0.5 mm, and the hardness is more than or equal to 60HRC.
Step 4: and welding the matrix on a drill rod of the rotary drilling rig. The matrix is one or more of a pressure-bearing locking block, a driving key or a key bar of the drill rod of the rotary drilling rig.
After the 3 substrates are clad, the clad parts are welded on the drill rod of the rotary drilling rig uniformly in circumference after cladding, the clad coatings of the circumferentially distributed pressure-bearing locking blocks and the driving keys are positioned on the same surface, and the clad coatings of the key bars are uniformly distributed in circumference so as to uniformly stress the drill rod.
Examples
A process for carrying out laser cladding on a stressed surface of a drill rod pressure-bearing locking block 2 of a rotary drilling rig comprises the following steps:
and 1, polishing the surface 3 to be clad of the drill rod pressure-bearing locking block 2 to be processed by using sand paper or a polishing machine, and removing the adherents and oxides on the surface.
And 2, preparing cladding powder, and loading the required alloy powder into a powder feeder of laser cladding equipment, wherein the alloy powder is iron-based alloy or nickel-based alloy.
And 3, installing the drill rod pressure-bearing locking block 2 to be clad on a processing machine tool for ultrahigh-speed laser cladding, and clamping by using a chuck tool.
And 4, setting laser cladding processing parameters, wherein the laser spot diameter of ultra-high-speed laser cladding is 0.8mm, the laser power is 3000-4000W, the powder feeding speed is 8-12r/min, the linear speed is 60-70mm/s, cladding can be performed in a plurality of layers, a cladding path program is compiled, and a processing head of laser cladding equipment is regulated, so that the processing head is positioned at the starting point of a cladding program setting path.
And 5, starting laser cladding equipment to finish cladding of the first layer of coating along the stressed surface of the drill rod pressure-bearing locking block 2, wherein a unidirectional arc track is adopted as a laser cladding track, and the thickness of a single-layer coating after cladding is about 0.7mm as shown in fig. 3.
And 6, lifting the ultrahigh-speed laser cladding processing head by 2mm, moving to a starting point position, keeping other laser cladding process parameters unchanged, cladding a second layer of coating, repeating the steps until the thickness of the coating reaches 3mm, and stopping cladding.
And 7, naturally cooling the welded drill rod pressure-bearing locking block 2 to room temperature.
And 8, welding the welded drill rod pressure-bearing locking block 2 on the drill rod of the rotary drilling rig to realize the improvement of the wear resistance of the stressed member of the drill rod.
Through tests, the depth of the thermal influence of the cladding coating 4 on the substrate is less than 1mm, the surface of the coating is better in molding, the coating structure is fine, the compactness is good, almost no cracks are generated, and through field use verification, the wear resistance is improved by nearly 10 times compared with the drill rod pressure-bearing locking block 2 without the cladding coating 4. As shown in fig. 4-5, a hardness partition test result diagram is shown; as shown in fig. 6 to 7, the abrasion resistance improvement test pictures based on the pin disc abrasion test. Wherein WC refers to a coating.
It is to be understood that the foregoing detailed description of the invention is merely illustrative of the invention and is not limited to the embodiments of the invention. It will be understood by those of ordinary skill in the art that the present invention may be modified or substituted for elements thereof to achieve the same technical effects; as long as the use requirement is met, the invention is within the protection scope of the invention.
Claims (8)
1. A high-speed laser cladding method for a drill rod of a rotary drilling rig is characterized by comprising the following steps of: the method comprises the following steps:
step 1, preprocessing the surface of a substrate;
step 2, preparing cladding powder;
step 3, performing laser cladding based on laser cladding equipment: the powder is intersected and melted with the laser above the matrix to form a cladding coating on the surface of the matrix;
step 4: and welding the matrix on a drill rod of the rotary drilling rig.
2. The high-speed laser cladding method for the drill rod of the rotary drilling rig according to claim 1, wherein the method comprises the following steps: the matrix is one or more of a pressure-bearing locking block, a driving key or a key bar of the drill rod of the rotary drilling rig.
3. The high-speed laser cladding method for the drill rod of the rotary drilling rig according to claim 2, wherein the method comprises the following steps: after the 3 substrates are clad, the clad parts are welded on the drill rod of the rotary drilling rig uniformly in circumference after cladding, the clad coatings of the pressure-bearing locking blocks and the driving keys are positioned on the same surface in circumference, and the surfaces of the clad coatings of the key bars are uniformly distributed in circumference so that the drill rod is uniformly stressed.
4. The high-speed laser cladding method for the drill rod of the rotary drilling rig according to claim 2, wherein the method comprises the following steps: in step 1, the substrate is heat-treated in advance to enhance the hardness of the substrate.
5. The high-speed laser cladding method for the drill rod of the rotary drilling rig according to claim 1, wherein the method comprises the following steps: the pretreatment is to purify the surface by shot blasting or mechanical sanding.
6. The high-speed laser cladding method for the drill rod of the rotary drilling rig according to claim 1, wherein the method comprises the following steps: the cladding powder is a high wear-resistant coating material.
7. The high-speed laser cladding method for the drill rod of the rotary drilling rig according to claim 1, wherein the method comprises the following steps: the laser cladding equipment adopts an optical fiber laser, the power is 3000-4000W, the powder feeding speed is 8-12r/min, and the linear speed is 60-70mm/s.
8. The high-speed laser cladding method for the drill rod of the rotary drilling rig according to claim 1, wherein the method comprises the following steps: the thickness of the cladding coating after cladding is 3+/-0.5 mm, and the hardness is more than or equal to 60HRC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310344174.9A CN116334620A (en) | 2023-04-03 | 2023-04-03 | High-speed laser cladding method for drill rod of rotary drilling rig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310344174.9A CN116334620A (en) | 2023-04-03 | 2023-04-03 | High-speed laser cladding method for drill rod of rotary drilling rig |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116334620A true CN116334620A (en) | 2023-06-27 |
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ID=86877130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310344174.9A Pending CN116334620A (en) | 2023-04-03 | 2023-04-03 | High-speed laser cladding method for drill rod of rotary drilling rig |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116334620A (en) |
-
2023
- 2023-04-03 CN CN202310344174.9A patent/CN116334620A/en active Pending
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