CN115506445B - Blade plate protection assembly and preparation method thereof - Google Patents
Blade plate protection assembly and preparation method thereof Download PDFInfo
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- CN115506445B CN115506445B CN202211083033.8A CN202211083033A CN115506445B CN 115506445 B CN115506445 B CN 115506445B CN 202211083033 A CN202211083033 A CN 202211083033A CN 115506445 B CN115506445 B CN 115506445B
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
- E02F9/2883—Wear elements for buckets or implements in general
-
- 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")
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
- E02F9/2808—Teeth
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
- E02F9/2808—Teeth
- E02F9/2816—Mountings therefor
- E02F9/2833—Retaining means, e.g. pins
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
- E02F9/2808—Teeth
- E02F9/285—Teeth characterised by the material used
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
- E02F9/2808—Teeth
- E02F9/2858—Teeth characterised by shape
Abstract
The invention discloses a blade protection assembly and a preparation method thereof, wherein the blade protection assembly comprises a supporting guide part wrapping the outer edge of a blade, a nose part arranged at one end of the supporting guide part far away from the blade and a blade connecting part arranged at one end of the supporting guide part close to the blade, the whole protection assembly is of a bilateral symmetry structure, the supporting guide part is of a C-shaped structure, the thickness of the upper side and the lower side of the supporting guide part along the direction close to the blade is gradually thinned, the width of the supporting guide part is gradually narrowed, the left side and the right side of the supporting guide part are of discontinuous curved surfaces, and the nose part is of a trapezoid structure with a tip protruding along the direction far away from the blade. The blade plate protection component has strong penetrating power and small resistance, can obviously reduce the friction force of the blade plate in the moment of entering materials and in the construction process, improves the working efficiency of earth and stone equipment, and can guide the materials, thereby protecting the tooth seat weld joint, reducing the abrasion probability of the blade plate, having good toughness of a matrix and high surface hardness, enhancing the abrasion resistance and prolonging the service life of the blade plate.
Description
Technical Field
The invention belongs to the technical field of earth and stone working equipment, and particularly relates to a blade plate protection assembly and a preparation method thereof.
Background
The excavator and the loader are used as earth and stone working equipment and have irreplaceable functions in building, mining, water conservancy, petroleum and national defense construction. The bucket is a core part in the earth-rock mechanical working device, and directly interacts with materials (soil, sediment, rock, ore and the like) in the excavating process, so that larger impact load and frictional resistance are born. Particularly the blade at the edge of the bucket is most susceptible to wear, corrosion and even cracking, which shortens the remaining life of the product and reduces the operating efficiency of the equipment. Therefore, a protection device is needed to be added at the blade plate to avoid the early failure of the product.
Most of the prior art adopts a mode of simply wrapping the edge of the blade plate at the interval of the bucket teeth, thereby isolating the main blade plate and the materials and playing a role of reducing the abrasion of the blade plate. The current blade protection assembly is usually prepared by casting and other methods, and then microstructure and mechanical properties of the blade protection assembly are improved by heat treatment. As an invention patent "bucket edge protection system" (CN 105593440 a), an edge protection segment of an edge protection system for a ground engaging implement of an earth working machine is disclosed.
The problems existing in the prior art are as follows: 1. the prior art only has the effect of substantially increasing the cross-sectional area of the bucket tooth by simply wrapping the blade edges at the spacing of the bucket teeth so that the drag is substantially increased at the point during the digging process. 2. The prior art only considers the protection effect on the blade plate, and has no function of protecting the tooth seat weld joint and guiding materials. 3. The prior art surfaces are typically cast surfaces, which are relatively smooth, resulting in fewer voids between the component and the material during operation, which also increases the chances of adhesion between the material and the component surface, and increases frictional resistance. 4. In the prior art, the microstructure is usually tempered sorbite, the whole toughness is good, a certain impact can be born, the surface hardness is low, the service life is short under the working condition of severe abrasion, and the protection effect on the main blade is obviously reduced.
Disclosure of Invention
The invention aims to overcome the defects, and provides the blade plate protection assembly and the preparation method thereof, wherein the blade plate protection assembly has strong penetrating power and small resistance, can obviously reduce the friction force of the blade plate in the moment of entering materials and in the construction process, improves the working efficiency of earth-rock equipment, and can guide the materials, thereby protecting the tooth seat weld joint, reducing the abrasion probability of the blade plate, ensuring good toughness of a substrate, improving the abrasion resistance and prolonging the service life of the blade plate.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the blade plate protection assembly comprises a supporting guide part wrapping the outer edge of the blade plate, a nose part arranged at one end of the supporting guide part far away from the blade plate, and a blade plate connecting part arranged at one end of the supporting guide part near the blade plate, wherein the whole protection assembly is of a bilateral symmetry structure,
the supporting and guiding part is of a C-shaped structure, the thickness of the upper side and the lower side along the direction close to the blade plate is gradually thinned, the width is gradually narrowed, the left side and the right side are discontinuous curved surfaces,
the nose is a trapezoid structure with a tip protruding along the direction away from the blade, the upper surface of the nose is a concave arc-shaped surface, the lower surface of the nose is a downward inclined plane, and the two sides of the nose are inclined planes.
Further, the upper part of one end of the supporting flow guiding part far away from the blade plate is provided with a protruding part, and the flow guiding effect is further improved by combining the shape structure of other parts.
Further, the included angle between the lower surface of the nose part and the horizontal plane is 15-45 degrees. The nose is firstly contacted with the material during operation, and a specific angle is formed between the nose and the material when the nose enters the material, so that the penetrating force is enhanced, and the friction resistance is reduced.
Furthermore, the blade plate connecting part can be arranged on the upper part or the lower part of the supporting and guiding part close to the blade plate, and can be connected with the blade plate in a welding mode or in a bolt or pin type.
Further, the upper part and the two sides of the outer surface of the supporting and guiding part above the nose part are covered with wear-resistant coatings, so that the wear resistance of the assembly is improved.
Further, the wear-resistant coating can be a bionic structure coating, the whole is in a stepped ripple shape by adopting a surface coating alloy coating based on the shape of the surface of the ripple clams. The thickness, the corrugation distance and the direction of the wear-resistant coating can be adjusted according to different working conditions (soil, sediment, rock, ore and the like).
Further, the wear-resistant coating comprises Fe55 alloy powder, ni55 alloy powder, niWC2 alloy powder or Co-based powder.
The stepped ripple structure of the wear-resistant coating reduces the probability of direct contact between materials and the surface of the component, and obviously increases the wear resistance of the surface through the strengthening effect of the alloy coating, so that the advantages of the wear resistance of the materials and the shape wear resistance are integrated.
Further, the blade plate protection component is made of 30CrMnSi hot rolled steel, ZG30CrMnSiMo cast steel, ZG30CrNiMo cast steel or ZG30Cr2Si2MnMo cast steel, and can be selected according to different material properties under different working conditions.
The invention also provides a preparation method of the blade plate protection assembly, which comprises the following steps:
forging or casting a blank according to structural features of the protective component;
heat treating the blank: heating the cast blank to 830-860 ℃, preserving heat for 1.5-3 h, discharging, air cooling to below 100 ℃, heating the blank to 840-860 ℃, preserving heat for 2-3 h, quenching, cooling, preserving heat for 1h at 450-500 ℃, tempering, cooling to 180-250 ℃ along with furnace, and discharging;
and for forging blanks, firstly adopting residual temperature quenching and cooling, carrying out tempering at 450-500 ℃ for 1h, and discharging after cooling to 180-250 ℃ along with furnace cooling.
Further, the making of the blank includes:
the protection component is made of 30CrMnSi hot rolled steel material, and a blank is manufactured through a die forging method;
the protection component is made of ZG30CrMnSiMo cast steel, ZG30CrNiMo cast steel or ZG30Cr2Si2MnMo cast steel, and a blank is manufactured through a lost foam casting method.
Further, the blank may be surface treated by sand blasting, shot blasting, or the like, prior to the heat treatment of the blank.
Further, the quenching cooling can be performed by adopting quenching liquid with the concentration of 6-10% PAG, and oil quenching can also be performed.
Further, the preparation method further comprises the step of preparing the wear-resistant coating by adopting a plasma arc spray welding (PTA), laser cladding or thermal spraying method after the blank is subjected to heat treatment.
Further, before the heat-treated blank is used for preparing the wear-resistant coating, the surface of the heat-treated blank needs to be cleaned by sand blasting, shot blasting and other methods.
Further, the blank with the wear-resistant coating can be covered with asbestos or put in plant ash, aluminum silicate and the like for slow cooling.
The protection component prepared by the method can be coated and sprayed according to the requirements of customers, and then is connected with the main blade plate component according to the use conditions, and is connected to the blade plate between the adjacent tooth seats by adopting welding, bolts or pins.
Compared with the prior art, the invention has the beneficial effects that:
according to the blade plate protection assembly, the sharp nose is arranged, so that the penetrating force at the moment of contact with materials is enhanced, the resistance is reduced, the friction force at the moment of the blade plate entering the materials and in the construction process can be obviously reduced, and the working efficiency of earth and stone equipment is improved; through the structural arrangement of the supporting flow guiding part, a flow guiding effect is generated on the materials, the contact track of the materials and the components is optimized, and the abrasion probability of the blade plate and the tooth seat weld joint is reduced.
By arranging the wear-resistant coating, the friction resistance is reduced, the wear resistance is enhanced, and the service life of the component is prolonged.
The blade plate protection component disclosed by the invention has the advantages of good toughness of a matrix, high surface hardness, stable combination of the matrix and a coating interface, remarkably improved overall wear resistance and impact resistance, and greatly prolonged service life of the blade plate.
The blade plate protection component has wide application working conditions and greatly improves the application range of the product.
The blade plate protection component has the advantages of simple production process, easy processing, low cost and convenient popularization.
Drawings
Fig. 1 is a schematic perspective view of a blade protection assembly according to embodiment 1 of the present invention;
fig. 2 is a schematic side view of a blade protection assembly according to embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of the wear-resistant coating according to examples 2 to 4;
FIG. 4 is a schematic diagram showing a connection mode between the blade guard assembly and the blade according to the present invention;
FIG. 5 is an overall microstructure of the blade guard assembly of example 1;
FIG. 6 is an overall microstructure of the blade guard assembly of example 2;
FIG. 7 is a microstructure of the wear resistant coating described in example 2;
FIG. 8 is a microstructure of the wear resistant coating described in example 3;
fig. 9 is a microstructure of the wear resistant coating described in example 4.
In the figure: 1-a protection component, 11-a nose part, 12-a supporting guide part, 13-a blade plate connecting part and 14-a wear-resistant coating; 2-tooth holder; 3-blade plate.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings and specific examples.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
Example 1
The embodiment provides a blade plate protection assembly, which is mainly applicable to soil working conditions and is formed by casting ZG30CrMnSiMo components, and has the structure shown in fig. 1 and 2, and comprises a supporting guide part 12 wrapping the outer edge of a blade plate 3, a nose part 11 arranged at the front end of the supporting guide part 12 (in the embodiment of the invention, one end far away from the blade plate 3 is taken as the front end, the other direction is taken as the rear end, and the follow-up meaning is the same and is not repeated), and a blade plate connecting part 13 arranged at the rear end of the supporting guide part 12, wherein the whole protection assembly 1 is in a bilateral symmetry structure, the supporting guide part 12 is in a C-shaped structure, the upper side and the lower side both show a front low, a rear high, a front wide and a rear narrow change, the left side and the right side are discontinuous curved surfaces, and the upper part of the front end is provided with a protruding part; the nose 11 is of a trapezoid structure with front tip and rear width, the upper surface is an inward concave arc surface, the lower surface is a downward inclined plane, the included angle between the lower surface and the horizontal plane is 30 degrees, and the two sides of the nose are inclined planes.
The preparation method of the blade protection assembly in the embodiment comprises the following steps:
(1) Casting the blank according to the structure shown in fig. 1 and 2, wherein the casting component content is as follows: 0.28% -0.32%, si:1.10% -1.3%, mn:0.90% -1.1%, S is less than or equal to 0.015%, P is less than or equal to 0.015%, cr:1.00% -1.20%, mo:0.35% -0.55%, and the balance being Fe; and smelting twice by adopting an arc furnace and an AOD refining furnace, and casting and forming.
(2) Primary surface treatment: and after the casting blank is cooled, adopting a sand blasting method to clean the surface.
(3) And (3) heat treatment: heating the blank to 860 ℃, preserving heat for 2 hours, discharging, air-cooling to room temperature, heating the blank to 860 ℃, preserving heat for 2 hours, quenching and cooling by adopting 6% PAG quenching liquid, tempering at 500 ℃, preserving heat for 1 hour, air-cooling, tempering at 180 ℃ and preserving heat for 1 hour, tempering, and discharging after cooling to 180 ℃ along with the furnace.
(4) Secondary surface treatment: and cleaning the oxidized scale after heat treatment by sand blasting on the furnace cooling sample.
(5) Coating: and (3) paint spraying and coating are carried out on the cleaned sample, so that the preparation of the blade protection assembly is completed.
The blade plate connecting part 13 of the protection component 1 is connected with the blade plate 3 in a bolt fixing mode, and one protection component 1 is installed between every two adjacent tooth holders 2, as shown in fig. 4.
The blade protection assembly prepared in this embodiment has good overall performance, the hardness is 36-38 hrc, and the microstructure is tempered sorbite, as shown in fig. 5.
Example 2
The embodiment provides a blade plate protection assembly, which is mainly suitable for working conditions such as silt, adopts a 30CrMnSi hot-rolled steel die forging blank, and has the structure that on the basis of the embodiment 1, a wear-resistant coating 14 is added above and on two sides of the outer surface of a supporting guide part 12, as shown in fig. 3, the wear-resistant coating 14 is a bionic structure coating which is based on the shape of the surface of a corrugated clam body and is in a stepped corrugated shape as a whole, and the wear-resistant coating 14 in the embodiment is prepared by adopting Fe55 self-fluxing alloy powder.
The preparation method of the blade protection assembly in the embodiment comprises the following steps:
(1) And (3) blanking: punching a hot-rolled round steel 30CrMnSi blank into a bar stock with a proper size, wherein the 30CrMnSi blank comprises the following components in percentage by weight: 0.28% -0.32%, si:0.95% -1.05%, mn:1.04% -1.10%, S is less than or equal to 0.015%, P is less than or equal to 0.015%, cr:1.05% -1.10%, mo:0.10% -0.20%, al:0.08% -0.12% and the balance of Fe.
(2) Induction heating: and carrying out induction heating on the blanked bar stock.
(3) Blank die forging and forming: and carrying out die forging forming, trimming and punching on the whole heated bar according to the structure shown in fig. 1 and 2.
(4) And (3) heat treatment: and (3) carrying out residual quenching on the forged blank, wherein the cooling liquid is 6% PAG quenching liquid, then tempering is carried out at 450 ℃, the heat preservation time is 1h, and cooling to 250 ℃ along with the furnace and discharging.
(5) Pre-welding treatment: and cleaning the oxidized scale after heat treatment by sand blasting on the furnace cooling sample.
(6) Spray welding of the wear-resistant coating: the Fe55 alloy powder is selected, and the main component content is as follows: 1.1% -1.2%, si:4.0% -4.5%, ni:11.5% -13.0%, B3.0% -3.5%, cr:15% -17%, mo:4.0% -5.0%, and the balance being Fe; powder spray welding is carried out at the position shown in fig. 3 by adopting a PTA mode, the spray welding thickness is 3-4 mm, the corrugated layer spacing is 8mm and 10mm alternately, and the included angle between the two side surfacing layers and the middle surfacing layer is 30-35 degrees.
(7) Cooling and coating: and covering the welded blank with asbestos, slowly cooling for about 6 hours, and then spraying paint and coating to finish the preparation of the blade protection component.
The blade plate connecting part 13 of the protection component 1 is connected with the blade plate 3 in a welding mode, and one protection component 1 is installed between every two adjacent tooth holders 2, as shown in fig. 4.
The matrix of the blade protection component prepared by the embodiment has good comprehensive performance, the hardness is 36-38 HRC, and the microstructure is tempered sorbite, as shown in fig. 6; the hardness of the Fe-based wear-resistant coating 14 is 55-57 HRC, and the microstructure is shown in FIG. 7.
Example 3
The embodiment provides a blade protection assembly, which is mainly applicable to working conditions such as coal seam ore, and is formed by casting ZG30CrNiMo components, and the structure is that on the basis of the embodiment 1, a wear-resistant coating 14 is added above and on two sides of the outer surface of a supporting and guiding part 12, as shown in fig. 3, the wear-resistant coating 14 is a bionic structure coating which is based on the shape of a corrugated clam body surface and is in a stepped corrugated shape as a whole, and the wear-resistant coating 14 in the embodiment is prepared by adopting Ni55 self-fluxing alloy powder.
The preparation method of the blade protection assembly in the embodiment comprises the following steps:
(1) Casting the blank according to the structure shown in fig. 1 and 2, wherein the casting component content is as follows: 0.30% -0.35%, si:0.65% -0.75%, mn:0.85% -0.95%, S is less than or equal to 0.015%, P is less than or equal to 0.015%, cr:1.25% -1.35%, mo:0.30% -0.40%, ni:0.30 to 0.40 percent of Al:0.08% -0.12% and the balance of Fe.
(2) Surface treatment: and after the casting blank is cooled, adopting a sand blasting method to clean the surface.
(3) And (3) heat treatment: heating the blank to 860 ℃, preserving heat for 2h, discharging, air-cooling to 80 ℃, heating the blank to 860 ℃, preserving heat for 2h, quenching and cooling by adopting 8% PAG quenching liquid, tempering at 500 ℃ and preserving heat for 1h, and discharging after cooling to 200 ℃ along with furnace.
(4) Pre-welding treatment: and cleaning the oxidized scale after heat treatment by sand blasting on the furnace cooling sample.
(5) Spray welding of the wear-resistant coating: ni55 alloy powder is selected, and the main component content is C:0.75% -0.95%, si: 4.0-4.5%, fe less than or equal to 14.0%, B3.5-4.5%, cr:16% -17%, cu:3.0% -4.0%, mo:3.0% -4.0% and the balance of Ni; powder spray welding is carried out at the position shown in fig. 3 by adopting a PTA mode, the spray welding thickness is 3mm, the corrugated layer spacing is 10mm, and the included angle between the two opposite welding layers and the middle surfacing layer is 30-35 degrees.
(6) Cooling and coating: and (3) slowly cooling the welded blank in plant ash for about 4 hours, and then spraying paint and coating to finish the preparation of the blade plate protection assembly.
The blade plate connecting part 13 of the protection component 1 is connected with the blade plate 3 in a welding mode, and one protection component 1 is installed between every two adjacent tooth holders 2, as shown in fig. 4.
The matrix structure and performance index of the blade protection assembly prepared in this example are substantially identical to those of example 2; the hardness of the Ni-based wear-resistant coating 14 is 55-56 HRC, and the microstructure is shown in FIG. 8.
Example 4
The embodiment provides a blade plate protection assembly, which is mainly suitable for rock working conditions and is cast by adopting ZG30CrNiMo components, and the structure is that on the basis of the embodiment 1, a wear-resistant coating 14 is added above and on two sides of the outer surface of a supporting guide part 12, as shown in fig. 3, the wear-resistant coating 14 is a bionic structure coating which is based on the shape of the surface of a corrugated clam body and is in a stepped corrugated shape as a whole, and the wear-resistant coating 14 in the embodiment is prepared by adopting NiWC2 alloy powder.
The preparation method of the blade protection assembly in the embodiment comprises the following steps:
(1) Casting the blank according to the structure shown in fig. 1 and 2, wherein the casting component content is as follows: 0.30% -0.35%, si:0.65% -0.75%, mn:0.85% -0.95%, S is less than or equal to 0.015%, P is less than or equal to 0.015%, cr:1.25% -1.35%, mo:0.30% -0.40%, ni:0.30 to 0.40 percent of Al:0.08% -0.12% and the balance of Fe.
(2) Surface treatment: and after the casting blank is cooled, adopting a sand blasting method to clean the surface.
(3) And (3) heat treatment: heating the blank to 860 ℃, preserving heat for 2h, discharging, air-cooling to 80 ℃, heating the blank to 860 ℃, preserving heat for 2h, quenching and cooling by adopting 8% PAG quenching liquid, tempering at 500 ℃ and preserving heat for 1h, and discharging after cooling to 200 ℃ along with furnace.
(4) Pre-welding treatment: and cleaning the oxidized scale after heat treatment by sand blasting on the furnace cooling sample.
(5) And (3) cladding a wear-resistant coating: niWC2 alloy powder is selected, and the main component content is as follows: 0.8%, si:4.5 percent of Fe less than or equal to 15.0 percent, 3.5 percent of B and Cr:16%, mo:3.0%, WC:20% of Ni and the balance of Ni; powder cladding is carried out at the position shown in fig. 3 by adopting a laser cladding mode, the cladding thickness is 1mm, the corrugated layer spacing is 5mm, and the included angle between the two opposite welding layers and the middle surfacing layer is 30-35 degrees.
(6) Cooling and coating: and (3) placing the blank after cladding into plant ash, slowly cooling for about 4 hours, and then spraying paint and coating to finish the preparation of the blade protection component.
The blade plate connecting part 13 of the protection component 1 is connected with the blade plate 3 in a welding mode, and one protection component 1 is installed between every two adjacent tooth holders 2, as shown in fig. 4.
The matrix structure and performance index of the blade protection assembly prepared in this example are basically consistent with those of example 1; the NiWC2 wear-resistant coating 14 has an average hardness of 60HRC, a hard phase WC hardness of 70HRC, and a microstructure as shown in FIG. 9.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described, and these modifications and variations should also be considered as being within the scope of the invention.
Claims (7)
1. A blade protection component is characterized by comprising a supporting guide part wrapping the outer edge of a blade, a nose part arranged at one end of the supporting guide part far away from the blade and a blade connecting part arranged at one end of the supporting guide part close to the blade, wherein the whole protection component is in a bilateral symmetry structure,
the supporting and guiding part is of a C-shaped structure, the thickness of the upper side and the lower side along the direction close to the blade plate is gradually thinned, the width is gradually narrowed, the left side and the right side are discontinuous curved surfaces,
the nose part is of a trapezoid structure with a tip protruding in the direction away from the blade plate, the upper surface of the nose part is a concave arc-shaped surface, the lower surface of the nose part is a downward inclined plane, and the two sides of the nose part are inclined planes;
the upper part of one end of the supporting flow guiding part, which is far away from the blade plate, is provided with a protruding part;
the upper part and the two sides of the outer surface of the supporting and guiding part above the nose part are covered with a wear-resistant coating which is in a stepped ripple shape.
2. The blade guard assembly of claim 1, wherein the lower surface of the nose portion is angled from 15 ° to 45 ° from horizontal.
3. The blade guard assembly of claim 1, wherein the wear resistant coating is comprised of Fe55 alloy powder, ni55 alloy powder, niWC2 alloy powder or Co-based powder.
4. The blade guard assembly of claim 1, wherein the blade guard assembly is made of 30CrMnSi hot rolled steel, ZG30CrMnSiMo cast steel, ZG30CrNiMo cast steel, or ZG30Cr2Si2MnMo cast steel.
5. A method of making a blade guard assembly according to any one of claims 1 to 4, comprising:
forging or casting a blank according to structural features of the protective component;
heat treating the blank: for casting the blank, heating to 830-860 ℃, preserving heat for 1.5-3 h, discharging, air cooling to below 100 ℃, heating the blank to 840-860 ℃, preserving heat for 2-3 h, quenching, cooling, preserving heat for 1h at 450-500 ℃, tempering, cooling to 180-250 ℃ along with furnace, and discharging;
and for forging blanks, firstly adopting residual temperature quenching and cooling, carrying out tempering at 450-500 ℃ for 1h, and discharging after cooling to 180-250 ℃ along with furnace cooling.
6. The method of manufacturing a blade guard assembly according to claim 5, wherein forging or casting a blank according to structural features of the guard assembly comprises:
the protection component is made of 30CrMnSi hot rolled steel, and a blank is forged by a die forging method;
the protection component is made of ZG30CrMnSiMo cast steel, ZG30CrNiMo cast steel or ZG30Cr2Si2MnMo cast steel, and a blank is cast by a lost foam casting method.
7. The method of claim 5, further comprising preparing the wear resistant coating by plasma arc spray welding, laser cladding, or thermal spraying after heat treating the blank.
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| CN202211083033.8A CN115506445B (en) | 2022-09-06 | 2022-09-06 | Blade plate protection assembly and preparation method thereof |
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| CN202211083033.8A CN115506445B (en) | 2022-09-06 | 2022-09-06 | Blade plate protection assembly and preparation method thereof |
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|---|---|
| CN115506445A (en) | 2022-12-23 |
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