CN115216765B - Method for preparing high-hardness wear-resistant coating by laser cladding of agricultural machinery cutting tool - Google Patents
Method for preparing high-hardness wear-resistant coating by laser cladding of agricultural machinery cutting tool Download PDFInfo
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- CN115216765B CN115216765B CN202210909777.4A CN202210909777A CN115216765B CN 115216765 B CN115216765 B CN 115216765B CN 202210909777 A CN202210909777 A CN 202210909777A CN 115216765 B CN115216765 B CN 115216765B
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- 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
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/25—Direct deposition of metal particles, e.g. direct metal deposition [DMD] or laser engineered net shaping [LENS]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/38—Process control to achieve specific product aspects, e.g. surface smoothness, density, porosity or hollow structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- 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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- Manufacturing & Machinery (AREA)
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Automation & Control Theory (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention relates to the technical field of laser additive manufacturing, and provides a method for preparing a high-hardness wear-resistant coating by laser cladding of an agricultural machine cutting tool, which comprises the following steps: stacking a plurality of agricultural machine cutting tools to be processed, and clamping and restraining to form a cutting tool stacking body; placing the blade stack on a substrate with the first processing face facing upward as a cladding surface; adopting multi-pass additive printing to print 2 cladding layers on a first processing surface to form a first coating structure with a triangular structure, wherein the thickness of the first coating structure is changed in a gradient manner; turning the cutting tool stack by 90 degrees, and enabling a second processing surface to face upwards to serve as a cladding surface; adopting multi-pass additive printing to form 1 layer of cladding layer on a second processing surface to form a second coating structure with a triangular structure, wherein the thickness of the second coating structure is changed in a gradient manner; finally, the back gap of the agricultural machine cutting tool is impacted by the pneumatic impact shovel, and the agricultural machine cutting tool is separated. According to the invention, assembly line production is realized in a batch clamping mode, the problem of cracking caused by large heat input quantity of a cladding layer prepared by a single cutter is solved, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field, in particular to a novel energy-saving environment-friendly energy-saving.
Background
Agricultural implements are a major concern in modern agricultural development. The development of the agricultural machine cutting tool is a powerful driving force for promoting the progress of the agricultural machine, and is a primary task for improving the development of agriculture. At present, research and application of new technology and new technology for improving the agricultural machinery cutting tool are being made at home and abroad. Grass blades of mowers, agricultural subsoilers, ploughshares, rotary cultivator blades, mini-tiller blades, agricultural harvester cutters and the like in agricultural machinery. The main failure mode of the agricultural tool is abrasion due to the contact of soil, sand, fragments and the like.
At present, the surfacing technology is the most commonly used technology for improving the wear resistance of the agricultural machine cutting tool at the present stage, but has the problems of large heat affected zone, easy deformation of a workpiece and the like, so that the surfacing technology has a critical effect on the thickness and the surface shape of the agricultural machine part, and particularly aims at processing and modifying the slightly flat cutting tool, and the problems of deformation, internal cracking and the like caused by thermal stress are easy to generate.
Disclosure of Invention
The invention aims to provide a simple and efficient method for preparing a high-hardness wear-resistant cladding layer by laser cladding of an agricultural tool, which can realize automatic industrial production, has high cladding forming precision, high surface flatness of the cladding layer, meets the use requirement, does not need post treatment, reduces the production cost, shortens the processing period and provides a processing scheme for solving the production problem of the agricultural tool with high performance at low cost and high efficiency.
According to a first aspect of the invention, a method for preparing a high-hardness wear-resistant coating by laser cladding of an agricultural tool is provided, which comprises the following steps:
stacking a plurality of agricultural machine cutting tools to be processed, and clamping and restraining the agricultural machine cutting tools through a tool to form a cutting tool stacking body; the coating processing surface of each agricultural tool is a long-side working surface and a tool top surface directly connected with the long-side working surface, the long-side working surfaces of a plurality of tools are stacked to form a first processing surface of a tool stacking body through stacking the agricultural tools, the top surfaces of the plurality of tools are stacked to form a second processing surface of the tool stacking body, and the first processing surface is adjacent to the second processing surface;
placing the blade stack on a substrate with the first processing face facing upward as a cladding surface;
planning a cladding track, a laser scanning process and a powder feeding process on a first processing surface according to the long-side working surfaces of the agricultural machinery cutting tools, carrying out laser cladding material increase in a protective gas environment according to the cladding track, the laser scanning process and the powder feeding process, and printing 2 cladding layers on the long-side working surfaces of the agricultural machinery cutting tools in a multi-pass material increase mode to form a first coating structure of a triangular structure, wherein the thickness of the first coating structure is changed in a gradient manner; one thicker side of the first coating structure is positioned at the end surface adjacent to the second processing surface, so that a supporting structure for preparing the second coating structure on the second processing surface is formed;
turning the cutting tool stack by 90 degrees, and enabling a second processing surface to face upwards to serve as a cladding surface;
planning a cladding track, a laser scanning process and a powder feeding process on a second processing surface according to the shape of the top surfaces of the cutting tools of the agricultural machinery, carrying out laser cladding material increase in a protective gas environment according to the cladding track, the laser scanning process and the powder feeding process, printing 1 cladding layer on the top surfaces of the cutting tools of the agricultural machinery in a multi-pass material increase mode, and forming a second coating structure of a triangular structure, wherein the thickness gradient of the second coating structure is changed; the thicker side of the second coating structure is positioned at the end surface adjacent to the first processing surface;
and (3) impacting the back gaps of the agricultural machinery cutting tools through a pneumatic impact shovel to separate each agricultural machinery cutting tool.
As an alternative embodiment, in the first coating structure of the triangular body structure, the maximum thickness of the coating is 3mm, the minimum thickness is 0.15mm, and the length is 50mm; the cladding pass is 20;
the laser scanning process comprises the following steps: the laser power is 1300W-2000W, the laser beam adopts a round light spot, the diameter of the light spot is 5mm, the scanning line speed is 10-30mm/s, the lap joint rate is 50%, and the argon protection flow is 40-50ml/min;
the powder feeding process comprises 20 times of powder feeding, wherein the powder feeding amount is in continuous gradient change trend.
As an alternative embodiment, in the second coating structure of the triangular body structure, the maximum thickness of the coating is 1.5mm, the minimum thickness is 0.15mm, and the length is 25mm; the cladding pass is 10.
The laser scanning process comprises the following steps: the laser power is 1300W-2000W, the laser beam adopts a round light spot, the diameter of the light spot is 5mm, the scanning line speed is 10-30mm/s, the lap joint rate is 50%, and the argon protection flow is 40-50ml/min;
the powder feeding process comprises 10 times of powder feeding, wherein the powder feeding amount is in continuous gradient change trend.
According to a second aspect of the object of the invention, a high-hardness wear-resistant coating structure for the surface of an agricultural tool prepared by the method is also provided.
According to the technical scheme, the laser cladding preparation method for the high-hardness wear-resistant coating on the surface of the agricultural machinery cutting tool provided by the invention realizes the production line production in a batch clamping mode, solves the problem of cracking caused by large heat input quantity of a cladding layer prepared by a single cutter, improves the production efficiency, realizes the preparation of the gradient wear-resistant coating by adjusting the powder feeding quantity to match the thickness of the cladding layer with proper thickness, reduces the post-treatment procedures, improves the production efficiency and shortens the production period.
It should be understood that all combinations of the foregoing concepts, as well as additional concepts described in more detail below, may be considered a part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent. In addition, all combinations of claimed subject matter are considered part of the disclosed inventive subject matter.
The foregoing and other aspects, embodiments, and features of the present teachings will be more fully understood from the following description, taken together with the accompanying drawings. Other additional aspects of the invention, such as features and/or advantages of the exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the embodiments according to the teachings of the invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic diagram of a laser cladding preparation system for a high-hardness wear-resistant coating on a surface of an agricultural implement according to an embodiment of the invention.
Fig. 2 is a schematic illustration of a high hardness wear resistant coating prepared on the surface of an agricultural implement in accordance with an embodiment of the present invention.
Fig. 3 is a schematic view of a process for preparing a high hardness wear resistant coating on the surface of an agricultural implement in accordance with an embodiment of the present invention.
Fig. 4 is a schematic view of the physical structure of an agricultural implement according to an embodiment of the present invention.
Fig. 5 is a schematic view of the physical structure of a cutting tool stack formed by vertically stacking cutting tools of an agricultural machine according to an embodiment of the present invention.
Fig. 6 is a schematic illustration of laser cladding additive processing of a blade stack in accordance with an embodiment of the present invention.
Fig. 7 is a schematic illustration of a surface preparation coating structure for a blade tool stack according to an embodiment of the present invention.
Figure 8 is a schematic illustration of a coating structure prepared on a single agricultural implement surface after the agricultural implements of the implement stack of the present invention are separated.
Detailed Description
For a better understanding of the technical content of the present invention, specific examples are set forth below, along with the accompanying drawings.
Aspects of the invention are described in this disclosure with reference to the drawings, in which are shown a number of illustrative embodiments. The embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, may be implemented in any of a number of ways, as the disclosed concepts and embodiments are not limited to any implementation. Additionally, some aspects of the disclosure may be used alone or in any suitable combination with other aspects of the disclosure.
The system for preparing the high-hardness wear-resistant coating on the surface of the agricultural machinery cutting tool shown in fig. 1 comprises a laser cladding head 1, a control cabinet 3, a cladding processing control system 4 and a carrier gas type powder feeder 5. In fig. 1, 10 shows a single agricultural implement, and a plurality of agricultural implements are stacked vertically together to form a single implement stack 100, as shown in fig. 5 and 6.
In alternative embodiments, the number of stacks may be determined by the shape and size of the agricultural implement, typically 3-10 stacks are selected to form a working surface suitable for additive manufacturing processing. In an embodiment of the present invention, stacking is performed using the cutting tools of 5 corn harvesters as an example.
The laser cladding head 1 is arranged on the mechanical arm, and the control cabinet 3 is used for controlling the movement of the mechanical arm according to a control signal of the PLC control system 4, so that the laser cladding head is controlled to move according to a preset track to perform laser cladding material adding processing.
The carrier gas type powder feeder 5 adopts argon gas, is controlled by the cladding processing control system 4, feeds powder to a powder feeding nozzle below the laser cladding head 1, and feeds powder to the surface of the cutting tool stack 100.
The cladding process control system 4 may be implemented using an industrial grade PLC control system.
In connection with the examples shown in fig. 2-8, a flat structured blade for use with a corn harvester is illustrated, and typically the agricultural implement has a rectangular parallelepiped-like flat structure including two working surfaces, a narrower long side working surface and a blade top surface adjacent thereto, as shown in fig. 2, 3, and 4.
In the embodiment of the present invention, the agricultural tools 10 are vertically stacked to form an integral tool stack 100, and as shown in fig. 5 and 6, the coating structure is prepared by cladding the corresponding surfaces of the tool stack 100, i.e., the processing surfaces formed by the plurality of long-side working surfaces and the plurality of tool top surfaces.
The first coating structure may be first clad on the processing surface corresponding to the long-side working surface, and the edge of the first coating structure is flush with the processing surface corresponding to the top surface of the cutting tool, so that the first coating structure forms a supporting structure when the second coating structure is prepared on the processing surface corresponding to the top surface of the cutting tool.
We describe more specifically the process of the method for preparing high hardness wear resistant coatings by laser cladding on the surface of an agricultural implement in combination with a specific example, which specifically comprises the following steps, as shown in figures 3, 5, 6, 7:
stacking a plurality of agricultural machine cutting tools 10 to be processed, and clamping and restraining through a tool, for example, clamping and restraining through a plane vice, so as to form a cutting tool stack 100; the coating processing surface of each agricultural tool is a long-side working surface and a tool top surface directly connected with the long-side working surface, and the long-side working surfaces of a plurality of tools are stacked to form a first processing surface of a tool stack body through stacking the agricultural tools, as shown in fig. 5, the top surfaces of the plurality of tools are stacked to form a second processing surface of the tool stack body, and the first processing surface is adjacent to the second processing surface;
placing the blade stack 100 on a substrate with the first working face up as a cladding surface, as shown in fig. 3;
planning a cladding track, a laser scanning process and a powder feeding process on a first processing surface according to the long-side working surfaces of the agricultural machinery cutting tools, performing laser cladding material increase in a protective gas environment according to the cladding track, the laser scanning process and the powder feeding process, and printing 2 cladding layers on the long-side working surfaces of the agricultural machinery cutting tools in a multi-pass material increase mode to form a first coating structure 101 with a triangular structure, wherein the thickness of the first coating structure is changed in a gradient manner; the thicker side of the first coating structure is positioned at the end surface adjacent to the second processing surface, so that a supporting structure for preparing the second coating structure on the second processing surface is formed; wherein, the cladding powder is Ni-based WC composite material;
turning the blade stack 100 90 ° with the second working face up as a cladding surface;
planning a cladding track, a laser scanning process and a powder feeding process on a second processing surface according to the shape of the top surfaces of the cutting tools of the agricultural machinery, carrying out laser cladding material increase in a protective gas environment according to the cladding track, the laser scanning process and the powder feeding process, printing 1 layer of cladding layer on the top surfaces of the cutting tools of the agricultural machinery in a multi-pass material increase mode to form a second coating structure 102 with a triangular structure, wherein the thickness of the second coating structure is changed in a gradient manner; the thicker side of the second coating structure is positioned at the end surface adjacent to the first processing surface; wherein, the cladding powder is Ni-based WC composite material; as shown in fig. 7, a schematic representation of the preparation of the resulting coating structure on both surfaces of the blade stack;
each agricultural implement is separated by impacting the rear gap of the agricultural implement with a pneumatic impact shovel to obtain a single agricultural implement with a surface prepared with a highly wear resistant coating, as shown in fig. 8.
It will be appreciated that the coating structure is prepared on two adjacent surfaces of the blade stack, no coating is prepared on the other 2 surfaces opposite the two surfaces, there is a gap between the blades, and therefore in embodiments of the invention the separation of the blades is achieved by the pneumatic impact of the blade against the agricultural blade back gap.
The laser cladding processing adopts multi-nozzle coaxial carrier gas powder feeding, for example, four-way powder feeding, and the atmosphere of protective gas and the carrier gas of powder feeding in the cladding processing process are argon.
In the laser cladding additive process of the first coating structure 101 and the second coating structure, as shown in fig. 5 and 6, a laser cladding track adopts a reciprocating mode.
For example, in the laser cladding and material adding process of the first coating structure 101, each pass of laser cladding sequentially spans the long-side working surfaces of the agricultural machine cutting tools, after finishing the processing of the long-side working surfaces of all the agricultural machine cutting tools stacked under the pass, the laser cladding head rotates 180 degrees to perform the processing of the next pass, wherein the lap joint rate of the adjacent passes is 40% -50%.
In the laser cladding and material adding process of the second coating structure 102, each pass of laser cladding sequentially spans the top surfaces of the cutting tools of the agricultural machinery cutting tools, after finishing the processing of the top surfaces of all the cutting tools of the agricultural machinery cutting tools stacked under the pass, the laser cladding head rotates 180 degrees to process the next pass, wherein the overlap ratio of the adjacent passes is 40% -50%.
In particular, according to the structure of the solvent cutting tool, the thickness of the cladding layer shows a gradient change trend in the laser cladding material adding process of the first coating structure 101 and the second coating structure 102, so that a triangular structure is formed.
In an alternative embodiment, the thickness of the cladding layer is 1.5mm when the powder feeding amount is 2.0r/min through practical test. The gradient change of the thickness of the cladding layer is realized by controlling the gradient change of the powder feeding amount.
Taking a cutting tool with a flat structure as an example, which is used by a corn harvester, in a first coating structure 101 with a triangular structure, the maximum thickness of a coating is 3mm, the minimum thickness is 0.15mm, and the length is 50mm; the cladding pass is 20.
The laser scanning process comprises the following steps: the laser power is 1300W-2000W, the laser beam adopts a round light spot, the diameter of the light spot is 5mm, the scanning line speed is 10-30mm/s, the lap joint rate is 50%, and the argon protection flow is 40-50ml/min.
The 1 st cladding layer is numbered 1, the powder feeding amount is 0.1r/min, and the 20 th cladding layer is numbered 20 by pushing the powder feeding amount to be 2.0r/min.
The powder feeding process is planned as follows:
the powder feeding process comprises 20-pass powder feeding, wherein the powder feeding amount is in continuous gradient change trend.
In the second coating structure 102 of the triangular body structure, the maximum thickness of the coating is 1.5mm, the minimum thickness is 0.15mm, and the length is 25mm; the cladding pass is 10.
The laser scanning process comprises the following steps: the laser power is 1300W-2000W, the laser beam adopts a round light spot, the diameter of the light spot is 5mm, the scanning line speed is 10-30mm/s, the lap joint rate is 50%, and the argon protection flow is 40-50ml/min.
The powder feeding process is planned as follows:
the powder feeding process comprises 10-pass powder feeding, wherein the powder feeding amount is in continuous gradient change trend.
In other embodiments, the powder delivery amount can be adjusted and determined based on the coating thickness requirements and the line speed values.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.
Claims (5)
1. The method for preparing the high-hardness wear-resistant coating by laser cladding of the agricultural tool is characterized by comprising the following steps of:
stacking a plurality of agricultural machine cutting tools to be processed, and clamping and restraining the agricultural machine cutting tools through a tool to form a cutting tool stacking body; the coating processing surface of each agricultural tool is a long-side working surface and a tool top surface directly connected with the long-side working surface, the long-side working surfaces of a plurality of tools are stacked to form a first processing surface of a tool stacking body through stacking the agricultural tools, the top surfaces of the plurality of tools are stacked to form a second processing surface of the tool stacking body, and the first processing surface is adjacent to the second processing surface;
placing the blade stack on a substrate with the first processing face facing upward as a cladding surface;
planning a cladding track, a laser scanning process and a powder feeding process on a first processing surface according to the long-side working surfaces of the agricultural machinery cutting tools, carrying out laser cladding material increase in a protective gas environment according to the cladding track, the laser scanning process and the powder feeding process, and printing 2 cladding layers on the long-side working surfaces of the agricultural machinery cutting tools in a multi-pass material increase mode to form a first coating structure of a triangular structure, wherein the thickness of the first coating structure is changed in a gradient manner; one thicker side of the first coating structure is positioned at the end surface adjacent to the second processing surface, so that a supporting structure for preparing the second coating structure on the second processing surface is formed;
turning the cutting tool stack by 90 degrees, and enabling a second processing surface to face upwards to serve as a cladding surface;
planning a cladding track, a laser scanning process and a powder feeding process on a second processing surface according to the shape of the top surfaces of the cutting tools of the agricultural machinery, carrying out laser cladding material increase in a protective gas environment according to the cladding track, the laser scanning process and the powder feeding process, printing 1 cladding layer on the top surfaces of the cutting tools of the agricultural machinery in a multi-pass material increase mode, and forming a second coating structure of a triangular structure, wherein the thickness gradient of the second coating structure is changed; the thicker side of the second coating structure is positioned at the end surface adjacent to the first processing surface;
the back gaps of the agricultural machinery cutting tools are impacted through the pneumatic impact shovel, and each agricultural machinery cutting tool is separated;
in the laser cladding and material adding process of the first coating structure, each pass of laser cladding sequentially spans the long-side working face of the agricultural machine cutting tool, after the long-side working faces of all the agricultural machine cutting tools stacked under the pass are processed, the laser cladding head rotates 180 degrees to process the next pass, wherein the lap joint rate of the adjacent passes is 40% -50%;
in the laser cladding and material adding process of the second coating structure, each pass of laser cladding sequentially spans the top surfaces of the cutting tools of the agricultural machinery cutting tools, after finishing the processing of the top surfaces of all the cutting tools of the agricultural machinery cutting tools stacked under the pass, the laser cladding head rotates 180 degrees to process the next pass, wherein the lap joint rate of the adjacent passes is 40% -50%;
in the laser cladding material adding process of the first coating structure and the second coating structure, the thickness of the cladding layer shows gradient change trend, so that a triangular structure is formed;
in the first coating structure of the triangular body structure, the maximum thickness of the coating is 3mm, the minimum thickness is 0.15mm, and the length is 50mm; the cladding pass is 20;
the laser scanning process comprises the following steps: the laser power is 1300W-2000W, the laser beam adopts a round light spot, the diameter of the light spot is 5mm, the scanning line speed is 10-30mm/s, the lap joint rate is 50%, and the argon protection flow is 40-50ml/min;
the powder feeding process is planned as follows:
the powder feeding process comprises 20-pass powder feeding, wherein the powder feeding amount is in a continuous gradient change trend;
in the second coating structure of the triangular body structure, the maximum thickness of the coating is 1.5mm, the minimum thickness is 0.15mm, and the length is 25mm; the cladding pass is 10;
the laser scanning process comprises the following steps: the laser power is 1300W-2000W, the laser beam adopts a round light spot, the diameter of the light spot is 5mm, the scanning line speed is 10-30mm/s, the lap joint rate is 50%, and the argon protection flow is 40-50ml/min;
the powder feeding process is planned as follows:
the powder feeding process comprises 10-pass powder feeding, wherein the powder feeding amount is in continuous gradient change trend.
2. The method for preparing the high-hardness wear-resistant coating by laser cladding of the agricultural cutting tool according to claim 1, wherein a laser cladding track adopts a reciprocating mode in the laser cladding material adding process of the first coating structure and the second coating structure.
3. The method for preparing the high-hardness wear-resistant coating by laser cladding of the agricultural cutting tool according to claim 1, wherein the gradient change of the thickness of the cladding layer is realized by controlling the gradient change of the powder feeding amount.
4. The method for preparing the high-hardness wear-resistant coating by laser cladding of the agricultural cutting tool according to claim 1, wherein the cladding powder is Ni-based WC composite material in the laser cladding material adding process of the first coating structure and the second coating structure.
5. A high hardness wear resistant coating structure on the surface of an agricultural implement made according to the method of any one of claims 1-4.
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| CN112981393A (en) * | 2021-02-02 | 2021-06-18 | 泉州市双滢新材料科技有限公司 | Gradient hard coating cutter and preparation method thereof |
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