CN110814291A

CN110814291A - Assembly structure of burner blank and production method thereof

Info

Publication number: CN110814291A
Application number: CN201911347338.3A
Authority: CN
Inventors: 易刚亮
Original assignee: Y & J Industries Co Ltd
Current assignee: Y & J Industries Co Ltd
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-02-21

Abstract

The invention relates to an assembly structure of a burner blank and a production method of the burner blank, belonging to the technical field of silica sol precision casting. The side face of each blade is provided with the window, so that the sand spraying and the shell mold drying in the shell manufacturing process are facilitated, the sand cleaning of the internal runner of each blade in the post-treatment process is facilitated, and the problems possibly occurring in two key processes of shell manufacturing and sand cleaning in the silica sol casting process are solved. The ceramic core is not used in the casting process, so that the instability of the casting quality caused by the instability of the ceramic core is avoided, the product percent of pass is improved, the production efficiency is improved, and the production cost is reduced to a great extent. The invention designs the special groove for preventing the inner cavity from generating welding beading, and ensures the surface quality of the inner cavity. The invention adopts a sectional wax injection recombination mode and a production process of sectional casting and welding after casting, thereby greatly reducing the processing difficulty and the production cost.

Description

Assembly structure of burner blank and production method thereof

Technical Field

The invention relates to an assembly structure of a burner blank and a production method of the burner blank, belonging to the technical field of silica sol precision casting.

Background

A blank product of an industrial combustor is a hollow and thin-wall part and comprises 1 main cylinder and 8 blades, wherein the main cylinder is of a cylinder structure with an opening at the top and a closed bottom end, and the blades are arranged in the peripheral direction of the main cylinder at intervals and are fixedly connected with the main cylinder to form an integral structure; the blade is internally provided with a cavity structure which is communicated with the inner cavity of the main cylinder

The wall thickness of the part is 6mm at least, the width of a flow passage in the blade is 12mm, and the external dimension is 560mm multiplied by 305 mm; the product is made of CK-20 high-temperature resistant stainless steel, and the weight of the product is about 26 kilograms; the product required 100% test gas pressure, 100psi pressure, no leakage was allowed. The product appearance is shown in figure 1:

the existing process adopts silica sol precision casting, and the common method adopts a process scheme that integral casting is adopted and a ceramic core (a high-strength refractory material) is required under an inner cavity.

The key casting process comprises the following steps:

1) the ceramic core is purchased from a foundry, and the foundry usually purchases the ceramic core through a professional manufacturer, and the ceramic core manufacturer needs to open a special ceramic core mold to produce the ceramic core, and fig. 2 is a schematic three-dimensional structure diagram of the ceramic core (1 in 8 ceramic cores).

2) Wax injection: and injecting the molten wax into a product mold through a high-pressure wax injector, cooling the high-temperature wax to form a wax mold, and fixing the ceramic core in the wax mold.

3) Preparing a shell: and covering a plurality of layers of sand and a binder on the surface of the wax mould.

4) Wax loss: after the shell mold is solidified, the wax mold is melted by high-temperature water, and finally only the shell mold and the ceramic core in the inner cavity are left.

5) And (5) shell mold roasting.

6) And smelting molten steel.

7) Pouring: and casting the smelted molten steel into the prepared shell mold.

8) And after the casting is finished, carrying out post-process treatment.

However, the prior art has two problems:

first, the strength and diffusivity of the ceramic core are two contradictory properties and are not stable. If the strength of the ceramic core is too high, the diffusivity of the ceramic core is poor, and the later-stage inner cavity is difficult to remove sand (the technical requirement of the product is that the inner cavity is not allowed to have a little sand sticking); if the strength of the ceramic core is too low, the diffusivity of the ceramic core is better, the later sand removal is easier, but the ceramic core with low strength is easily broken by high-temperature molten steel during casting, and the whole product is scrapped. Therefore, in any case, the product is unqualified, and the product rejection rate is high;

secondly, each product needs a ceramic core, and the cost of the ceramic core is very high, which directly increases the product cost.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the utility model provides an assembly structure of combustor blank to solve the difficult problem of ceramic core clearance when the present casting is processed, reduce manufacturing cost simultaneously.

The technical scheme adopted by the invention for solving the technical problems is as follows: the assembly structure of the burner blank comprises a main cylinder and a plurality of blades, wherein the main cylinder is of a cylinder structure with an opening at the top and a closed bottom end, and the blades are arranged in the peripheral direction of the main cylinder at intervals and are fixedly connected with the main cylinder to form an integral structure; the blade is internally provided with a cavity structure, the cavity structure is communicated with the inner cavity of the main cylinder body, the side surface of each blade is provided with a blade opening communicated with the cavity structure, the main cylinder body, the blades and the blade openings are of an integral structure formed by casting, the blade openings are provided with cover plates, the cover plates correspond to the blade openings one by one, the circumferential direction of the cover plates and the inner walls of the blade openings form welding grooves, and the cover plates and the inner walls are connected into the integral structure by welding.

Further, the method comprises the following steps: the cover plate is an integrally formed casting and is made of the same material as the main cylinder and the blades.

Further, the method comprises the following steps: the welding groove structure between the cover plate and the blade opening is that the side wall of the blade opening is provided with a bulge at the inner end part, the circumferential end surface of the cover plate is provided with a notch for accommodating the bulge, the bulge and the notch form a clamping and positioning structure, and the outer end part of the side wall of the blade opening and the circumferential end surface of the cover plate are assembled to form a V-shaped groove.

Further, the method comprises the following steps: after the protrusion and the notch form a clamping and positioning structure, the inner surface of the cover plate and the cavity wall of the blade form a smooth and continuous plane or curved surface.

Further, the method comprises the following steps: and forming a welding seam at the V-shaped groove, wherein the outer end face of the welding seam is higher than the outer end face of the V-shaped groove so as to form machining allowance.

Correspondingly, the invention also provides a production method of the burner blank, the burner blank is implemented by adopting the assembling structure, and the production method comprises the following steps: setting the integral structure formed by the main cylinder, the blades and the blade openings as a casting A, and casting to obtain the casting A; processing to obtain a cover plate; and welding the cover plate at the opening position of the blade on the casting A to obtain a burner blank.

The casting processing of the casting A comprises the following steps:

step one, taking a casting A as a target product, and manufacturing a wax mold A; the wax pattern A is prepared by the following steps: manufacturing a wax mold B by taking the main cylinder body as a target product; taking a single blade with a blade opening as a target product, and manufacturing a wax mold C; positioning and assembling the wax mold B and the plurality of wax molds C, and connecting the wax molds B and the plurality of wax molds C into a whole at the connecting parts of the wax molds B and the plurality of wax molds C in a hot melting mode to obtain a wax mold A;

step two, transferring the wax mold A to a shell making process;

step three, wax loss;

step four, roasting the shell mold;

step five, smelting and pouring molten steel;

and sixthly, performing sand cleaning and shot blasting treatment on the cast blank after pouring to obtain a casting A.

Further, the method comprises the following steps: the side wall of the wax mould B is provided with a wax mould positioning groove, the wax mould C is provided with a wax mould positioning boss matched with the wax mould positioning groove, and the wax mould positioning groove and the wax mould positioning boss form a wax mould clamping and positioning structure.

The positioning and assembling of the wax mold B and the wax mold C are realized through the following tools: the tool comprises a positioning base and a limiting plate, wherein first positioning clamping grooves corresponding to the wax molds C one by one are arranged on the upper surface of the positioning base, and second positioning clamping grooves corresponding to the wax molds B are also arranged on the upper surface of the positioning base; positioning and mounting the wax mold B and the multiple wax molds C on the upper surface of the positioning base; the limiting plate is arranged in the peripheral direction of an integral structure formed by the wax mould B and the wax mould C, and the limiting plate is in contact with the outer end part of the wax mould C. The preferable arrangement mode of the limiting plate is as follows: the two limiting plates are symmetrically arranged, the two limiting plates are combined to form a hoop structure, and the two limiting plates are connected at the end positions through bolts. And after the wax mold A is manufactured in a thermal fusion mode, disassembling the tool.

Further, the method comprises the following steps: the cover plate is an integrally formed casting and is made of the same material as the main cylinder and the blades; the casting of the cover plate comprises the following steps: manufacturing a wax mold D by taking the single cover plate as a target product; transferring the wax mold D to a shell making process; wax loss; shell mold roasting; smelting and pouring molten steel; and (4) performing sand cleaning and shot blasting treatment on the cast blank after casting to obtain the cover plate.

Further, the method comprises the following steps: the welding groove structure between the cover plate and the blade opening is that a bulge is arranged at the inner end part of the side wall of the blade opening, a notch for accommodating the bulge is arranged on the circumferential end surface of the cover plate, the bulge and the notch form a clamping and positioning structure, and the outer end part of the side wall of the blade opening and the circumferential end surface of the cover plate are assembled to form a V-shaped groove; forming a welding seam at the V-shaped groove, wherein the outer end face of the welding seam is higher than the outer end face of the V-shaped groove so as to form machining allowance; and after welding is finished, polishing the welding seam to enable the outer surface to be flat.

The invention has the beneficial effects that: according to the production implementation process, the invention solves the problem of sand removal in casting of hollow and thin-wall parts, can meet the quality requirement and reduce the cost. The method comprises the following specific steps:

firstly, a ceramic core is not used in the casting process, so that the instability of the quality of a casting caused by the instability of the ceramic core is avoided, the qualification rate of a product is improved, and the production efficiency is improved.

And secondly, the production cost is reduced. The process does not relate to the use of a ceramic core any more, and the production cost is greatly reduced.

Thirdly, the side face of each blade is provided with a window, so that sand spreading and shell mold drying in the shell manufacturing process are facilitated, sand cleaning of a flow passage in the blade in the post-treatment process is facilitated, and the problems possibly occurring in two key processes of shell manufacturing and sand cleaning in the silica sol casting process are solved.

Fourthly, a special groove for preventing the inner cavity from generating welding beading is designed in the process, and the surface quality of the inner cavity is ensured.

Through practice, the invention is successfully applied to the production of certain industrial combustor products, and obtains better economic benefit.

Drawings

FIG. 1 is a schematic product form construction of a prior art burner blank;

FIG. 2 is a schematic representation of a three-dimensional structure of a ceramic core according to the prior art;

FIG. 3 is a schematic product configuration of casting A of the present invention;

FIG. 4 is a schematic view of a welding groove structure between a cover plate and a blade opening in the present invention;

FIG. 5 is a front view of a wax pattern B of the present invention;

FIG. 6 is a sectional view of a wax pattern B of the present invention;

FIG. 7 is a three-dimensional structural view of a wax pattern C in the present invention;

FIG. 8 is a three-dimensional structural view of a wax pattern D in the present invention;

FIG. 9 is a schematic view showing the assembly of a wax pattern B and a wax pattern C into a wax pattern A according to the present invention;

FIG. 10 is a three-dimensional block diagram of a positioning base of the present invention;

FIG. 11 is a three-dimensional block diagram of a limiting plate according to the invention;

fig. 12 is a schematic view of the tool structure of the present invention when the wax pattern B and the wax pattern C are positioned and assembled.

Labeled as: 1-main cylinder body, 2-blade, 3-blade opening, 31-bulge, 4-cover plate, 100-wax pattern A, 101-wax pattern B, 102-wax pattern C, 103-wax pattern positioning groove, 104-wax pattern positioning boss, 105-wax pattern D, 201-positioning base, 202-limiting plate, 203-first positioning clamping groove, 204-second positioning clamping groove and 205-central positioning groove.

Detailed Description

The invention is further explained below with reference to the drawings and examples.

As shown in fig. 3 and 4, the burner blank of the present invention adopts a split structure, and then is assembled into a whole, and the specific assembly structure is: the blade type wind power generator comprises a main cylinder body 1 and a plurality of blades 2, wherein the main cylinder body 1 is of a cylinder structure with an opening at the top and a closed bottom end, and the blades 2 are arranged in the peripheral direction of the main cylinder body 1 at intervals and fixedly connected with the main cylinder body 1 to form an integral structure; the blades 2 are internally provided with cavity structures which are communicated with the inner cavity of the main cylinder body 1, the side surface of each blade 2 is provided with a blade opening 3 communicated with the cavity structure, the main cylinder body 1, the blades 2 and the blade openings 3 are of an integral structure formed by casting, the integral structure formed by the main cylinder body 1, the blades 2 and the blade openings 3 is set to be a casting A, and the appearance structure of the casting A is shown in figure 3. The blade opening 3 is respectively provided with a cover plate 4, the cover plates 4 correspond to the blade openings 3 one by one, a welding groove is formed between the circumferential direction of the cover plates 4 and the inner wall of the blade openings 3, and the cover plates and the inner wall are connected into an integral structure through welding.

As shown in fig. 4, the welding groove structure between the cover plate 4 and the blade opening 3 is specially designed, and the structure is specifically that a protrusion 31 is arranged at the inner end part of the side wall of the blade opening 3, a notch for accommodating the protrusion 31 is arranged on the circumferential end surface of the cover plate 4, the protrusion 31 and the notch form a clamping and positioning structure, and the outer end part of the side wall of the blade opening 3 and the circumferential end surface of the cover plate 4 are assembled to form a V-shaped groove. During welding, the structure of the bulge 31 can prevent molten liquid formed by welding materials from flowing into the inner cavity to form welding beading, and the surface quality of the inner cavity is ensured. In order to ensure the integral performance of the inner cavity structure, after the protrusion 31 and the notch form a clamping and positioning structure, the inner surface of the cover plate 4 and the inner wall of the cavity of the blade 2 form a smooth and continuous plane or curved surface. During welding, a welding seam is formed at the V-shaped groove, the outer end face of the welding seam is higher than the outer end face of the V-shaped groove, so that machining allowance is formed, and after welding is completed, polishing is performed at the welding seam, so that the outer surface is smooth, and the outer surface quality of a product is effectively guaranteed.

The cover plate 4 can be formed by various machining methods in the prior art or other different materials, but in order to ensure the overall performance of the product and save the production cost, the cover plate 4 in the invention is an integrally formed casting and is made of the same material as the main cylinder body 1 and the blades 2. In addition, when the welding groove structure is adopted, the cover plate 4 and the notches at the circumferential end face positions thereof can be integrally cast and molded; similarly, the projections 31 at the positions of the side walls of the blade opening 3 may be integrally cast with the casting a. The positions of the blade openings 3 on the blades 2 may be arranged on different sides or on the same side, but for convenience of manufacturing, the blade openings 3 of each blade 2 are preferably arranged on the same side, and taking the embodiment shown in fig. 3 as an example, the blade openings 3 are all arranged on the left side of the blade 2. The blades 2 should be uniformly distributed, that is, the blades 2 are uniformly spaced in the peripheral direction of the main cylinder 1, in accordance with the structural performance of the final burner product.

When the burner blank piece is implemented by adopting the assembling structure, the burner blank piece comprises the following steps: setting the integral structure formed by the main cylinder 1, the blades 2 and the blade openings 3 as a casting A, and performing casting processing to obtain the casting A; processing to obtain a cover plate 4; and welding the cover plate 4 at the position of the blade opening 3 on the casting A to obtain a burner blank.

The casting processing of the casting A comprises the following steps:

step one, taking a casting A as a target product, and manufacturing a wax mold A100;

as shown in fig. 5 to 7, and 9 to 12, the wax pattern a100 is manufactured as follows: taking the main cylinder 1 as a target product, and manufacturing a wax mold B101; taking a single blade 2 with a blade opening 3 as a target product, and manufacturing a wax mold C102; positioning and assembling the wax mold B101 and the plurality of wax molds C102, and connecting the wax molds B and C102 into a whole at the connecting part of the wax molds B and C in a thermal fusion manner to obtain a wax mold A100;

step two, transferring the wax mould A100 to a shell making process;

step three, wax loss;

step four, roasting the shell mold;

step five, smelting and pouring molten steel;

To facilitate the positioning connection of wax pattern B101 and wax pattern C102: wax matrix locating slot 103 has been arranged to the lateral wall of wax matrix B101, and wax matrix C102 is provided with the wax matrix location boss 104 with wax matrix locating slot 103 looks adaptation, constitutes wax matrix block location structure through wax matrix locating slot 103 and wax matrix location boss 104. This wax matrix block location structure can play the connection location effect.

In order to facilitate positioning and assembling of the wax patterns B101 and C102, the wax patterns are fixed in advance by the following tools before being connected in a thermal fusion manner: the tool comprises a positioning base 201 and a limiting plate 202, wherein first positioning clamping grooves 203 corresponding to the wax molds C102 one by one are formed in the upper surface of the positioning base 201, and second positioning clamping grooves 204 corresponding to the wax molds B101 are formed in the upper surface of the positioning base 201; positioning and mounting the wax pattern B101 and the multiple wax patterns C102 on the upper surface of the positioning base 201; the stopper plate 202 is arranged in the circumferential direction of the integrated structure of the wax pattern B101 and the wax pattern C102, and the stopper plate 202 is in contact with the outer end portion of the wax pattern C102. The preferable arrangement of the limiting plate 202 is as follows: the two limiting plates 202 are symmetrically arranged, the two limiting plates 202 are combined to form a hoop structure, and the two limiting plates 202 are connected at the end positions through bolts. After the wax pattern a100 is manufactured in a thermal fusion manner, the tool is disassembled. In addition, for positioning in assembly, a center positioning groove 205 is further disposed on the upper surface of the positioning base 201.

When the cover plate 4 is integrally formed by casting, the casting process comprises the following steps: as shown in fig. 8, a wax pattern D105 is manufactured with the single cover plate 4 as a target product; transferring the wax mold D105 to a shell making process; wax loss; shell mold roasting; smelting and pouring molten steel; and (4) performing sand cleaning and shot blasting treatment on the cast blank after casting to obtain the cover plate 4.

The preferred embodiment:

the invention is applied to the production of blank products of certain industrial burners, and the overall structure and the size of the products are the same as those introduced in the background technology. The invention is characterized in that the side surface of each blade 2 is provided with a blade opening 3 communicated with the cavity structure, the main cylinder 1, the blades 2 and the blade openings 3 are of an integral structure formed by casting, the integral structure formed by the main cylinder 1, the blades 2 and the blade openings 3 is set as a casting A, and the appearance structure of the casting A is shown in figure 3. The blade opening 3 is respectively provided with a cover plate 4, the cover plates 4 correspond to the blade openings 3 one by one, a welding groove is formed between the circumferential direction of the cover plates 4 and the inner wall of the blade openings 3, and the cover plates and the inner wall are connected into an integral structure through welding. The welding groove structure is shown in fig. 4.

During production, the invention is realized by the following steps:

step one, taking a casting A as a target product, and manufacturing a wax mold A100; manufacturing a wax mold D105 by taking the single cover plate 4 as a target product;

the wax pattern a100 is prepared as follows: taking the main cylinder 1 as a target product, and manufacturing a wax mold B101; taking a single blade 2 with a blade opening 3 as a target product, and manufacturing a wax mold C102; positioning and assembling the wax mold B101 and the plurality of wax molds C102, and connecting the wax molds B and C102 into a whole at the connecting part of the wax molds B and C in a thermal fusion manner to obtain a wax mold A100;

step two, respectively transferring the wax mold A100 and the wax mold D105 to a shell making process;

step three, wax loss;

step four, roasting the shell mold;

step five, smelting and pouring molten steel;

step six, respectively carrying out sand cleaning and shot blasting treatment on the cast blank after pouring to obtain a casting A and a cover plate casting;

and step seven, welding the casting A and the cover plate casting, and polishing the machining allowance of the welding line to be flat after welding to obtain a burner blank. And then the subsequent process is carried out.

The wax mould can be manufactured by adopting a conventional injection moulding process without arranging a ceramic core. In addition, the shell making process, the dewaxing process, the shell mold roasting process, the molten steel smelting process and the pouring process are all conventional processes, and reference can be made to the description of the background technology, and the description is omitted here.

The key point of the invention is that the production process of adopting the mode of sectional wax injection recombination, adopting the sectional casting and welding after the casting is finished greatly reduces the processing difficulty and the production cost.

Claims

1. The assembling structure of the burner blank comprises a main cylinder body (1) and a plurality of blades (2), wherein the main cylinder body (1) is of a cylinder structure with an open top and a closed bottom, and the blades (2) are arranged in the peripheral direction of the main cylinder body (1) at intervals and are fixedly connected with the main cylinder body (1) to form an integral structure; blade (2) inside has the cavity structure to this cavity structure is linked together with the inner chamber of main cylinder body (1), its characterized in that: the side of each blade (2) is provided with a blade opening (3) communicated with a cavity structure of the blade, the main cylinder body (1), the blades (2) and the blade openings (3) are of an integral structure formed by casting, the blade openings (3) are provided with cover plates (4), the cover plates (4) correspond to the blade openings (3) one by one, welding grooves are formed between the circumferential direction of the cover plates (4) and the inner walls of the blade openings (3), and the cover plates and the inner walls are connected into the integral structure by welding.

2. The assembling structure of burner blanks as recited in claim 1, wherein: the cover plate (4) is an integrally formed casting and is made of the same material as the main cylinder body (1) and the blades (2).

3. The assembling structure of a burner blank as set forth in claim 1 or 2, wherein: the welding groove structure between the cover plate (4) and the blade opening (3) is characterized in that a protrusion (31) is arranged at the inner end part of the side wall of the blade opening (3), a notch for accommodating the protrusion (31) is formed in the circumferential end face of the cover plate (4), the protrusion (31) and the notch form a clamping and positioning structure, and the outer end part of the side wall of the blade opening (3) and the circumferential end face of the cover plate (4) are assembled to form a V-shaped groove.

4. The assembling structure of burner blanks as recited in claim 3, wherein: after the protrusion (31) and the notch form a clamping and positioning structure, the inner surface of the cover plate (4) and the cavity wall of the blade (2) form a smooth and continuous plane or curved surface.

5. The assembling structure of burner blanks as recited in claim 3, wherein: and forming a welding seam at the V-shaped groove, wherein the outer end face of the welding seam is higher than the outer end face of the V-shaped groove so as to form machining allowance.

6. A method for producing a burner blank, characterized by using the assembling structure of a burner blank according to any one of claims 1, 3 and 4, and comprising the steps of:

setting the integral structure consisting of the main cylinder body (1), the blades (2) and the blade openings (3) as a casting A, and casting to obtain the casting A; processing to obtain a cover plate (4); welding a cover plate (4) at the position of a blade opening (3) on the casting A to obtain a burner blank;

the casting processing of the casting A comprises the following steps:

step one, taking a casting A as a target product, and manufacturing a wax mold A (100); the wax pattern a (100) is produced as follows: manufacturing a wax mold B (101) by taking the main cylinder body (1) as a target product; manufacturing a wax mould C (102) by taking a single blade (2) with a blade opening (3) as a target product; positioning and assembling a wax pattern B (101) and a plurality of wax patterns C (102), and connecting the wax patterns B and C into a whole at the connecting part of the wax patterns B and C in a thermal fusion manner to obtain a wax pattern A (100);

step two, transferring the wax mould A (100) to a shell making process;

step three, wax loss;

step four, roasting the shell mold;

step five, smelting and pouring molten steel;

7. The production method of a burner blank as set forth in claim 6, characterized in that: the side wall of the wax mould B (101) is provided with a wax mould positioning groove (103), the wax mould C (102) is provided with a wax mould positioning boss (104) matched with the wax mould positioning groove (103), and a wax mould clamping and positioning structure is formed by the wax mould positioning groove (103) and the wax mould positioning boss (104);

the positioning and assembling of the wax mold B (101) and the wax mold C (102) are realized through the following tools: the tool comprises a positioning base (201) and a limiting plate (202), wherein first positioning clamping grooves (203) corresponding to the wax molds C (102) one by one are formed in the upper surface of the positioning base (201), and second positioning clamping grooves (204) corresponding to the wax molds B (101) are formed in the upper surface of the positioning base (201); positioning and mounting a wax mould B (101) and a plurality of wax moulds C (102) on the upper surface of a positioning base (201); the limiting plate (202) is arranged in the peripheral direction of an integral structure formed by the wax mould B (101) and the wax mould C (102), and the limiting plate (202) is in contact with the outer end part of the wax mould C (102);

after the wax pattern A (100) is manufactured in a thermal fusion mode, the tool is disassembled.

8. The production method of a burner blank as set forth in claim 7, characterized in that: the two limiting plates (202) are symmetrically arranged, the two limiting plates (202) are combined to form a hoop structure, and the two limiting plates (202) are connected at the end positions through bolts.

9. The production method of a burner blank as set forth in any of claims 6 to 8, characterized in that: the cover plate (4) is an integrally formed casting and is made of the same material as the main cylinder body (1) and the blades (2); the casting of the cover plate (4) comprises the following steps: manufacturing a wax mold D (105) by taking the single cover plate (4) as a target product; transferring the wax mold D (105) to a shell making process; wax loss; shell mold roasting; smelting and pouring molten steel; and (4) performing sand cleaning and shot blasting treatment on the cast blank after pouring to obtain the cover plate (4).

10. The production method of a burner blank as set forth in any of claims 6 to 8, characterized in that: the welding groove structure between the cover plate (4) and the blade opening (3) is characterized in that a protrusion (31) is arranged at the inner end part of the side wall of the blade opening (3), a notch for accommodating the protrusion (31) is arranged on the circumferential end surface of the cover plate (4), the protrusion (31) and the notch form a clamping and positioning structure, and the outer end part of the side wall of the blade opening (3) and the circumferential end surface of the cover plate (4) are assembled to form a V-shaped groove; forming a welding seam at the V-shaped groove, wherein the outer end face of the welding seam is higher than the outer end face of the V-shaped groove so as to form machining allowance; and after welding is finished, polishing the welding seam to enable the outer surface to be flat.