CN113857773A - Method for forming fire retardant core structure - Google Patents
Method for forming fire retardant core structure Download PDFInfo
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- CN113857773A CN113857773A CN202111020341.1A CN202111020341A CN113857773A CN 113857773 A CN113857773 A CN 113857773A CN 202111020341 A CN202111020341 A CN 202111020341A CN 113857773 A CN113857773 A CN 113857773A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/24—Heat or noise insulation
- F02C7/25—Fire protection or prevention
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
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Abstract
The invention relates to a method for forming a fire retardant core structure, which comprises the following steps: step one, preparing a micro-pore diameter honeycomb body of a fire retardant core structure; step two, processing the skin of the fire retardant core structure; and step three, assembling and welding the micro-aperture honeycomb body and the skin to form a fire retardant core structure. The fire retardant core structure formed by the method is simple, and the produced product has high precision and good quality and is not easy to damage, thereby meeting the production requirement of the fire retardant core structure and the precision requirement and the use requirement of the product.
Description
Technical Field
The invention belongs to the technical field of aero-engines, and particularly relates to a method for forming a fire retardant core structure.
Background
The fire retardant core structure is a safety device of a fuel system of a certain type of aircraft engine and mainly has the functions of a high-pressure fuel gas jet passage and fuel oil of a high-temperature fuel gas backfire ignition oil circuit. The fire retardant core structure consists of a honeycomb body formed by hexagonal micro-pore-diameter holes with the wall thickness of 0.1mm and the pore diameter of 1.5mm and a skin with the material thickness of 0.5mm, and the prepared honeycomb body requires smooth inner wall of the hexagonal micro-pore-diameter holes, uniform and straight hexagonal pore diameters and no deformation or cracking at the high temperature of 1000 ℃. At present, the existing manufacturing process methods of the fire retardant core structure comprise machining forming, precision casting forming and 3D printing forming. However, the following problems arise with these manufacturing processes:
1. the micro-aperture honeycomb body formed by mechanical processing has long processing period, an electroerosion layer on the surface of a hexagonal hole of the micro-aperture honeycomb body cannot be removed, and cracks generated by surface electroerosion are easy to damage when high-speed airflow passes through the surface for a long time, so that the whole product is scrapped.
2. The hexagonal micro-aperture honeycomb body is formed by precision casting, the surface smoothness of the hexagonal holes and the straightness of the hexagonal holes can not meet the requirements, and the precision requirement of the product can not be met.
3. The hexagonal micro-aperture honeycomb body is printed and formed by 3D printing, and a cavity and ablation exist in the local part of the honeycomb wall, so that the use requirement of the fire retardant core structure cannot be met.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for forming a fire retardant core structure, the fire retardant core structure is simple to form by using the method, the produced product has high precision and good quality, is not easy to damage, and meets the production requirements of the fire retardant core structure and the precision requirements and the use requirements of the product.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method of forming a fire barrier core structure, the method comprising the steps of:
step one, preparing micro-aperture honeycomb body of fire retardant core
S101, cutting the appearance of the blank into strips, stamping the strips into corrugated plates by adopting a stamping die with a stamping surface with the smooth finish of Ra0.8um, and stamping a plurality of linear cutting positioning grooves at two ends of each corrugated plate;
s102, positioning the corrugated plate on a line cutting tool by using a line cutting positioning groove to cut the width of the corrugated plate on the line cutting tool;
s103, assembling corrugated plates in the tool layer by adopting a heat treatment tool for fixing, and putting the corrugated plates into a vacuum furnace for heat treatment and shaping;
s104, positioning the brazing filler metal blank on a brazing filler metal processing tool by utilizing the brazing filler metal processing tool, and cutting the brazing filler metal raw material into strip-shaped brazing filler metal;
s105, positioning a brazing filler metal presetting tool on a corrugated plate, presetting strip-shaped brazing filler metal on the convex surface of the corrugated plate by using the brazing filler metal presetting tool, positioning the strip-shaped brazing filler metal in a spot welding mode by using an energy storage spot welding machine, and smearing brazing filler metal bonding agents on the upper surface and the lower surface of the positioned strip-shaped brazing filler metal;
s106, sequentially assembling the corrugated plates which are subjected to the step S105 in an assembly tool, turning the corrugated plates with the even number of the layer number by 180 degrees during assembly, and connecting the convex surfaces of the corrugated plates which are turned by 180 degrees with the strip-shaped brazing filler metal on the convex surfaces of the lower layer to form a hexagonal hole core lattice body; inserting a positioning pin into a hexagonal hole at two ends of the hexagonal hole core lattice body corresponding to a positioning hole formed in an assembly tool;
s107, removing the assembly tool from the hexagonal hole core lattice body, clamping and fixing the hexagonal hole core lattice body by using a brazing tool, and placing the hexagonal hole core lattice body in a brazing furnace for vacuum brazing;
s108, cutting the brazed hexagonal cell core lattice into a cylindrical micro-aperture honeycomb body; the total length of the micro-aperture honeycomb body is 63.5mm, and the diameter of the micro-aperture honeycomb body is 33mm;
step two, processing the skin of the fire retardant core structure
S201, turning the outer diameter of the skin with the aperture of 33mm by adopting turning, turning the outer circle size of the skin to 38mm, and reserving a finish turning allowance;
step three, assembling and welding the micro-aperture honeycomb body and the skin into a fire retardant core structure
S301, paving brazing filler metal on the whole inner side face of the skin, and adopting an energy storage electric welding machine to spot-weld the brazing filler metal; sleeving the micro-aperture honeycomb body in the skin, enabling one end of the micro-aperture honeycomb body to be flush with one end of the skin, and putting the micro-aperture honeycomb body into a brazing furnace for vacuum brazing to obtain a fire retardant core structure blank;
s302, putting the fire retardant core structure blank into a heating furnace, heating to 100 ℃, filling filler into the end, not flush, of the skin of the fire retardant core structure blank and the micro-aperture honeycomb body, and compacting the filler;
s303, performing finish turning on the outer circle of the skin of the fire retardant core structure blank after the step S302 is completed, and reserving a chuck for linear cutting at one end with the filler;
s304, heating the fire retardant core structure blank subjected to the step S303 to 100 ℃, and removing the filler; the part of the skin, which exceeds the micro-aperture honeycomb body, is subjected to linear cutting along the end face of the micro-aperture honeycomb body by using a linear cutting machine tool clamping linear cutting chuck;
s305, carrying out clamp repairing and polishing on the fire retardant core structure blank subjected to the step S304 to grind the outer diameter and the end surface of the fire retardant core structure blank, and cleaning and removing redundant ablates in the fire retardant core structure blank to obtain the fire retardant core structure.
Preferably, in step S101, the length of the cut strip board is 110mm, and the width of the cut strip board is 400 mm; the diameter of an inscribed circle of a corrugated groove of the corrugated plate is 1.55mm, and the depth of the corrugated groove is 0.75 mm; the center distance between every two adjacent corrugated grooves of the corrugated plates is 2.9 mm; the width and the depth of the plurality of linear cutting positioning grooves at the two ends are both 3.1mm and 3mm respectively; the distance between each line cutting positioning groove and the adjacent line cutting positioning groove is 5.7 mm.
Preferably, in step S102, the width of the corrugated plate after the wire cutting is 50 mm.
Preferably, in step S103, the heat treatment is divided into vacuum pumping, heating and cooling procedures;
wherein, the vacuum pumping is cold state vacuum pumping, so that the vacuum degree in the furnace reaches 2 multiplied by 10-2PerPa, working vacuum degree of 5X 10-2Pa; the heating procedure is that the mixture is heated to 1000-1050 ℃ at the speed of 240 ℃/h; carrying out heat treatment at 1000-1050 ℃ for 20 min; the cooling procedure is that high-purity gas is filled into the furnace after the furnace is cooled to 650 ℃ in vacuum, so that the pressure in the furnace reaches 8 multiplied by 104After the pressure is/Pa, starting a fan to cool to 65 ℃ and discharging.
Preferably, in step S104, the brazing filler metal blank is BNi2 foil brazing filler metal with a thickness of 0.05 mm; the width of the strip-shaped brazing filler metal is 1.2mm, and the length of the strip-shaped brazing filler metal is 80 mm.
Preferably, in step S105, two ends of the strip-shaped brazing filler metal are welded on the convex surface of the corrugated plate, two spot welding points are set at the two ends respectively, the distance between the two spot welding points is 5mm, and a spot welding point at each end close to each of the two ends of the strip-shaped brazing filler metal is 4mm from the end edge of the strip-shaped brazing filler metal.
Preferably, in step S106, the positioning pin has a diameter of 1.55mm and a length of 10 mm.
Preferably, in step S107, the vacuum brazing is performed by vacuum pumping, heating and cooling processes,
wherein, the vacuum pumping is cold state vacuum pumping, so that the vacuum degree in the furnace reaches 2 multiplied by 10-2PerPa, working vacuum degree of 5X 10-2Pa; the heating procedure is that the mixture is heated to 900 ℃ at the speed of 300 ℃/h and is kept for 60 min; heating to 1010-1050 ℃ at the speed of 360 ℃/h for brazing; brazing is carried out at 1010-1050 ℃ for 10 min; the cooling procedure is that high-purity gas is filled into the furnace after the furnace is cooled to 600 ℃ in vacuum, so that the pressure in the furnace reaches 8 multiplied by 104After the pressure is/Pa, starting a fan to cool to 65 ℃ and discharging.
Preferably, in step S303, the size of the finish turning is 4mm, and the length of the reserved wire cutting chuck is 12 mm.
Preferably, in step S304, the total length of the wire-cut firestop core structure blank is 63.5 mm.
The invention has the technical effects and advantages that:
1. according to the forming method of the fire retardant core structure, the micro-aperture honeycomb body is formed by brazing the corrugated plates, so that the processing period of the micro-aperture honeycomb body can be greatly shortened, the problem that cracks are easily generated on the surface of a hexagonal hole due to electro-corrosion is solved, the problem that holes and ablation holes are generated on the local honeycomb wall is solved, and the service life and the use requirements of the product are improved.
2. According to the forming method of the fire retardant core structure, the corrugated plates forming the micro-aperture honeycomb body are formed by stamping the battens, and the stamping surface of the stamping die is high in smoothness, so that the smoothness of the surface of the hexagonal hole and the straightness of the hexagonal hole can meet the precision requirement of a product.
3. According to the forming method of the fire retardant core structure, the plurality of line cutting positioning grooves are punched at the two ends of the corrugated plate when the corrugated plate is punched, and the corrugated plate is positioned on the line cutting tool by the line cutting positioning grooves when the width line cutting of the corrugated plate is carried out, so that the dislocation in the line cutting process of the corrugated plate can be avoided, and the line cutting precision is effectively improved.
4. According to the forming method of the fire retardant core structure, after the strip-shaped brazing filler metal is spot-welded on the convex surface of the corrugated plate, the adhesive is coated on the upper surface and the lower surface of the strip-shaped brazing filler metal, the corrugated plate assembled on each layer can be fixed by the brazing filler metal adhesive, the displacement of the corrugated plate is limited, and the brazing precision of the corrugated plate is improved.
5. According to the method for forming the fire retardant core structure, the positioning pins are inserted into the two ends of the assembled hexagonal hole core grids, so that the straightness of the hexagonal hole and the spacing precision among the core grids during brazing can be guaranteed, and the brazing quality is effectively improved.
6. According to the method for forming the fire retardant core structure, the skin is thin in wall thickness and poor in strength, the cylindricity of the micro-aperture honeycomb blank is easily damaged during machining, and the filler is filled in one end of the micro-aperture honeycomb blank, so that the strength of the micro-aperture honeycomb blank can be enhanced, and the cylindricity of the micro-aperture honeycomb blank can be guaranteed.
7. According to the method for forming the fire retardant core structure, the line cutting chuck is reserved at one end of the micro-aperture honeycomb blank, and is clamped on a line cutting machine tool when the total length of the micro-aperture honeycomb blank is cut linearly, so that the phenomenon that the surface of the micro-aperture honeycomb blank is indented and the quality of the micro-aperture honeycomb blank is damaged can be effectively avoided.
Drawings
FIG. 1 is a schematic structural view of a shaped firestop core structure of the present invention;
FIG. 2 is a schematic view of the present invention for stamping a corrugated plate using a stamping die;
FIG. 3 is a schematic view of the present invention showing the line width of corrugated board;
FIG. 4 is a schematic view of the present invention utilizing a heat treatment tool to clamp corrugated sheets;
FIG. 5 is a schematic view showing the pre-arrangement of brazing filler metal to corrugated plates according to the present invention;
FIG. 6 is a schematic view of the present invention illustrating the assembly of corrugated board into an assembly fixture;
FIG. 7 is a schematic view of the present invention showing both ends of a corrugated plate fitted with positioning pins;
FIG. 8 is a schematic view of the present invention assembled a corrugated sheet into a brazing tool;
FIG. 9 is a schematic representation of the present invention of wire cutting a core lattice into a honeycomb of micro pore size;
FIG. 10 is a schematic view of the present invention illustrating the assembly of a micro-pore honeycomb body with a skin;
FIG. 11 is a schematic view of the present invention using a lathe to finish turn the outer diameter of the skin;
FIG. 12 is a schematic drawing of the present invention utilizing a wire cutting machine to cut a firestop core structure blank overall length.
Reference numbers in the figures: 1. a micro-pore honeycomb body; 2. and (4) covering the skin.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are given in conjunction with the accompanying drawings.
Referring to fig. 1, a fire barrier core structure comprising a micro-pore size honeycomb core 1 and a skin 2 is formed by a method comprising the steps of:
step one, preparing a micro-aperture honeycomb body of a fire retardant core;
step two, preparing a skin with a micro-aperture honeycomb structure;
and step three, assembling and welding the micro-aperture honeycomb body and the skin to form a fire retardant core structure.
Wherein the preparation of the micro-pore honeycomb body of the fire retardant core in the first step comprises the following steps:
s101, cutting the appearance of the blank into strips, stamping the strips into corrugated plates by adopting a stamping die with a stamping surface having a smooth finish of Ra0.8um, and stamping a plurality of linear cutting positioning grooves at two ends of each corrugated plate.
In the specific implementation, three-dimensional modeling is carried out by using computer three-dimensional software, the micro-pore honeycomb body is simulated and unfolded, the overall dimension of the micro-pore honeycomb body is determined by calculation, the stainless steel with the material of 0Cr18Nil0Ti0 as the wool material is selected, and the thickness of the material is 0.1 mm.
Referring to fig. 2, the strip plate has a cut length of 110mm and a width of 400 mm; the diameter of an inscribed circle of a corrugated groove of the corrugated plate is 1.55mm, and the depth of the corrugated groove is 0.75 mm; the center distance between every two adjacent corrugated grooves of the corrugated plates is 2.9 mm; the width and the depth of the plurality of linear cutting positioning grooves at the two ends are both 3.1mm and 3mm respectively; the distance between each line cutting positioning groove and the adjacent line cutting positioning groove is 5.7 mm.
During specific implementation, the polishing degree required by the surface of the stamping die is Ra0.8um, so that indentation on the surface of the corrugated plate in the stamping process can be avoided, and the surface quality of the corrugated plate is influenced.
S102, referring to fig. 3, the corrugated plate is positioned on the line cutting tool by using the line cutting positioning grooves to be cut into the width, and the width line of the corrugated plate is cut into 50 mm.
When concrete implementation, utilize the line of punching press to cut the constant head tank and fix a position honeycomb strip line cutting on the line cutting frock, can avoid honeycomb strip line cutting in-process dislocation to appear, improved the line and cut the precision.
And S103, as shown in figure 4, assembling the corrugated plates in the tool layer by adopting a heat treatment tool for fixing, and putting the corrugated plates into a vacuum furnace for heat treatment and shaping.
In specific implementation, the heat treatment is carried out by vacuum pumping, heating and cooling procedures;
wherein, the vacuum pumping is cold state vacuum pumping, so that the vacuum degree in the furnace reaches 2 multiplied by 10-2PerPa, working vacuum degree of 5X 10-2Pa; the heating procedure is that the mixture is heated to 1000-1050 ℃ at the speed of 240 ℃/h; carrying out heat treatment at 1000-1050 ℃ for 20 min; the cooling procedure is that high-purity gas is filled into the furnace after the furnace is cooled to 650 ℃ in vacuum, so that the pressure in the furnace reaches 8 multiplied by 104after/Pa, starting a fan to cool to 65 ℃ and discharging, wherein Ar of the high-purity gas is more than or equal to 99.999 percent or N2≥99.999%。
And S104, positioning the brazing filler metal blank on a tooling by utilizing a brazing filler metal processing tooling, and cutting the brazing filler metal raw material into strip-shaped brazing filler metal.
The brazing filler metal rough material is BNi2 foil brazing filler metal with the thickness of 0.05 mm; the width of the strip-shaped brazing filler metal is 1.2mm, and the length of the strip-shaped brazing filler metal is 80 mm.
When the brazing filler metal machining device is specifically implemented, the brazing filler metal is machined, the using amount of the brazing filler metal can be reasonably controlled, the situation that the size of a core grid is reduced due to the fact that redundant brazing filler metal is attached to the wall of the core grid in the brazing process is avoided, and machining precision is effectively improved.
And S105, referring to fig. 5, positioning a brazing filler metal presetting tool on the corrugated plate, presetting strip-shaped brazing filler metal on the convex surface of the corrugated plate by using the brazing filler metal presetting tool, performing spot welding positioning on the strip-shaped brazing filler metal by using an energy storage spot welding machine, and smearing brazing filler metal adhesives on the upper surface and the lower surface of the positioned strip-shaped brazing filler metal.
Two ends of the strip-shaped brazing filler metal are welded on the raised surface of the corrugated plate, two spot welding points are respectively set at the two ends, the distance between the two spot welding points is 5mm, and the distance between one spot welding point at the two ends, which is respectively close to the two ends of the strip-shaped brazing filler metal, and the end edge of the strip-shaped brazing filler metal is 4 mm.
When the corrugated plate brazing method is specifically implemented, the brazing filler metal adhesive is coated on the upper surface and the lower surface of the brazing filler metal, and each layer of assembled corrugated plate is fixed by the brazing filler metal adhesive, so that the displacement of the corrugated plate can be effectively limited, and the brazing precision is improved.
S106, as shown in the figures 6 and 7, sequentially assembling the corrugated plates which are subjected to the step S105 in an assembly tool, turning the corrugated plates with the even number of the layer number by 180 degrees during assembly, and connecting the raised surfaces of the corrugated plates which are turned by 180 degrees with the strip-shaped brazing filler metal on the raised surfaces of the lower layer to form a hexagonal-hole core lattice body; and inserting positioning pins into the hexagonal holes at two ends of the hexagonal hole core lattice body corresponding to the positioning holes formed in the assembly tool.
The diameter of the positioning pin is 1.55mm, and the length of the positioning pin is 10 mm.
During concrete implementation, the positioning pins are arranged at the two ends of the hexagonal hole core grids, so that the spacing precision among the core grids during brazing of the multi-layer corrugated plate can be effectively improved.
S107, as shown in the figure 8, the assembling tool is detached from the hexagonal hole core lattice body, the hexagonal hole core lattice body is clamped and fixed by the brazing tool, and the hexagonal hole core lattice body is placed in a brazing furnace for vacuum brazing.
In specific implementation, the vacuum brazing is carried out by vacuum pumping, heating and cooling procedures;
wherein, the vacuum pumping is cold state vacuum pumping, so that the vacuum degree in the furnace reaches 2 multiplied by 10-2PerPa, working vacuum degree of 5X 10-2Pa; the heating procedure is that the mixture is heated to 900 ℃ at the speed of 300 ℃/h and is kept for 60 min; heating at a rate of 360 ℃/h toBrazing at 1010-1050 ℃; brazing is carried out at 1010-1050 ℃ for 10 min; the cooling procedure is that high-purity gas is filled into the furnace after the furnace is cooled to 600 ℃ in vacuum, so that the pressure in the furnace reaches 8 multiplied by 104after/Pa, starting a fan to cool to 65 ℃ and discharging, wherein Ar of the high-purity gas is more than or equal to 99.999 percent or N2≥99.999%。
And S108, as shown in FIG. 9, cutting the brazed hexagonal cell lattice into a cylindrical micro-pore honeycomb body, wherein the total length of the micro-pore honeycomb body after wire cutting is 63.5mm, and the diameter of the micro-pore honeycomb body after wire cutting is 33 mm.
Step two, processing the skin of the micro-aperture honeycomb structure
S201, turning the outer diameter of the skin with the aperture of 33mm by adopting turning machining, turning the outer circle size of the skin to 38mm, and reserving a finish turning allowance.
Step three, assembling and welding the micro-aperture honeycomb body and the skin into a fire retardant core structure
S301, referring to fig. 11, paving brazing filler metal on the whole inner side surface of the skin, and adopting an energy storage electric welding machine to spot weld the brazing filler metal; and sleeving the micro-pore honeycomb body in the skin, leveling one end of the micro-pore honeycomb body with one end of the skin, and putting the micro-pore honeycomb body into a brazing furnace for vacuum brazing to obtain a fire retardant core structure blank.
In specific implementation, the brazing filler metal is made of a nickel-based foil.
S302, the fire retardant core structure blank is placed into a heating furnace to be heated to 100 ℃, filler is filled into the end, not flush, of the skin of the fire retardant core structure blank and the micro-aperture honeycomb body, and the filler is compacted.
During specific implementation, as the wall thickness of the skin is only 0.5mm, the strength is poor, the cylindricity of the micro-aperture honeycomb structure blank is easy to damage during machining, and a low-melting-point filler is filled at one end of the micro-aperture honeycomb structure blank, so that the strength can be enhanced, and the cylindricity is ensured.
And S303, referring to FIG. 11, performing finish turning on the outer circle of the skin of the fire retardant core structure blank after the step S302 is completed, and reserving a clamp for wire cutting at one end with the filler, wherein the size of the finish turning is 4mm, and the length of the reserved clamp for wire cutting is 12 mm.
When the device is specifically implemented, the line cutting chuck is reserved, so that the phenomenon that the surface of the micro-aperture honeycomb structure is indented to damage the quality of the micro-aperture honeycomb structure can be avoided when the line cutting chuck is cut.
S304, see fig. 12, heating the firestop core structure blank from which step S303 is completed to 100 ℃, and removing the filler; and (3) utilizing a wire cutting machine to clamp a wire cutting chuck to perform wire cutting on the part of the skin, which exceeds the micro-aperture honeycomb body, along the end face of the micro-aperture honeycomb body, wherein the total length of the fire retardant core structure blank subjected to the wire cutting is 63.5 mm.
S305, carrying out clamp repairing and polishing on the fire retardant core structure blank subjected to the step S304 to grind the outer diameter and the end surface of the fire retardant core structure blank, and cleaning and removing redundant ablates in the fire retardant core structure blank to obtain the fire retardant core structure.
Therefore, the fire retardant core structure formed by the method of the embodiment is simple to form, and the produced product is high in precision, good in quality and not easy to damage, and meets the production requirements of the fire retardant core structure and the precision requirements and use requirements of the product.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (10)
1. A method for forming a fire retardant core structure is characterized by comprising the following steps: the method comprises the following steps:
step one, preparing micro-aperture honeycomb body of fire retardant core
S101, cutting the appearance of the blank into strips, stamping the strips into corrugated plates by adopting a stamping die with a stamping surface with the smooth finish of Ra0.8um, and stamping a plurality of linear cutting positioning grooves at two ends of each corrugated plate;
s102, positioning the corrugated plate on a line cutting tool by using a line cutting positioning groove to cut the width of the corrugated plate on the line cutting tool;
s103, assembling corrugated plates in the tool layer by adopting a heat treatment tool for fixing, and putting the corrugated plates into a vacuum furnace for heat treatment and shaping;
s104, positioning the brazing filler metal blank on a brazing filler metal processing tool by utilizing the brazing filler metal processing tool, and cutting the brazing filler metal raw material into strip-shaped brazing filler metal;
s105, positioning a brazing filler metal presetting tool on a corrugated plate, presetting strip-shaped brazing filler metal on the convex surface of the corrugated plate by using the brazing filler metal presetting tool, positioning the strip-shaped brazing filler metal in a spot welding mode by using an energy storage spot welding machine, and smearing brazing filler metal bonding agents on the upper surface and the lower surface of the positioned strip-shaped brazing filler metal;
s106, sequentially assembling the corrugated plates which are subjected to the step S105 in an assembly tool, turning the corrugated plates with the even number of the layer number by 180 degrees during assembly, and connecting the convex surfaces of the corrugated plates which are turned by 180 degrees with the strip-shaped brazing filler metal on the convex surfaces of the lower layer to form a hexagonal hole core lattice body; inserting a positioning pin into a hexagonal hole at two ends of the hexagonal hole core lattice body corresponding to a positioning hole formed in an assembly tool;
s107, removing the assembly tool from the hexagonal hole core lattice body, clamping and fixing the hexagonal hole core lattice body by using a brazing tool, and placing the hexagonal hole core lattice body in a brazing furnace for vacuum brazing;
s108, cutting the brazed hexagonal cell core lattice into a cylindrical micro-pore diameter honeycomb body, wherein the total length of the micro-pore diameter honeycomb body is 63.5mm, and the diameter of the micro-pore diameter honeycomb body is 33mm;
step two, processing the skin of the fire retardant core structure
S201, turning the outer diameter of the skin with the aperture of 33mm by adopting turning, turning the outer circle size of the skin to 38mm, and reserving a finish turning allowance;
step three, assembling and welding the micro-aperture honeycomb body and the skin into a fire retardant core structure
S301, paving brazing filler metal on the whole inner side face of the skin, and adopting an energy storage electric welding machine to spot-weld the brazing filler metal; sleeving the micro-aperture honeycomb body in the skin, enabling one end of the micro-aperture honeycomb body to be flush with one end of the skin, and putting the micro-aperture honeycomb body into a brazing furnace for vacuum brazing to obtain a fire retardant core structure blank;
s302, putting the fire retardant core structure blank into a heating furnace, heating to 100 ℃, filling filler into the end, not flush, of the skin of the fire retardant core structure blank and the micro-aperture honeycomb body, and compacting the filler;
s303, performing finish turning on the outer circle of the skin of the fire retardant core structure blank after the step S302 is completed, and reserving a chuck for linear cutting at one end with the filler;
s304, heating the fire retardant core structure blank subjected to the step S303 to 100 ℃, and removing the filler; the part of the skin, which exceeds the micro-aperture honeycomb body, is subjected to linear cutting along the end face of the micro-aperture honeycomb body by using a linear cutting machine tool clamping linear cutting chuck;
s305, carrying out clamp repairing and polishing on the fire retardant core structure blank subjected to the step S304 to grind the outer diameter and the end surface of the fire retardant core structure blank, and cleaning and removing redundant ablates in the fire retardant core structure blank to obtain the fire retardant core structure.
2. A method of forming a fire barrier core structure as claimed in claim 1, wherein: in step S101, the length of the cut strip board is 110mm, and the width of the cut strip board is 400 mm; the diameter of an inscribed circle of a corrugated groove of the corrugated plate is 1.55mm, and the depth of the corrugated groove is 0.75 mm; the center distance between every two adjacent corrugated grooves of the corrugated plates is 2.9 mm; the width and the depth of the plurality of linear cutting positioning grooves at the two ends are both 3.1mm and 3mm respectively; the distance between each line cutting positioning groove and the adjacent line cutting positioning groove is 5.7 mm.
3. A method of forming a fire barrier core structure as claimed in claim 1, wherein: in step S102, the width of the corrugated plate after wire cutting is 50 mm.
4. A method of forming a fire barrier core structure as claimed in claim 1, wherein: in step S103, the heat treatment is performed by vacuum pumping, heating and cooling;
wherein, the vacuum pumping is cold state vacuum pumping, so that the vacuum degree in the furnace reaches 2 multiplied by 10-2PerPa, working vacuum degree of 5X 10-2Pa; the heating procedure is that the mixture is heated to 1000-1050 ℃ at the speed of 240 ℃/h; carrying out heat treatment at 1000-1050 ℃ for 20 min; the cooling procedure is that high-purity gas is filled into the furnace after the furnace is cooled to 650 ℃ in vacuum, so that the pressure in the furnace reaches 8 multiplied by 104after/Pa, starting a fan to cool to 65 ℃ and discharging。
5. A method of forming a fire barrier core structure as claimed in claim 1, wherein: in the step S104, the brazing filler metal blank is BNi2 foil brazing filler metal with the thickness of 0.05 mm; the width of the strip-shaped brazing filler metal is 1.2mm, and the length of the strip-shaped brazing filler metal is 80 mm.
6. A method of forming a fire barrier core structure as claimed in claim 1, wherein: in step S105, two ends of the strip-shaped brazing filler metal are welded on the convex surface of the corrugated plate, two spot welding points are set at the two ends respectively, the distance between the two spot welding points is 5mm, and the distance between one spot welding point at the two ends, which is close to the two ends of the strip-shaped brazing filler metal, and the end edge of the strip-shaped brazing filler metal is 4 mm.
7. A method of forming a fire barrier core structure as claimed in claim 1, wherein: in step S106, the positioning pin has a diameter of 1.55mm and a length of 10 mm.
8. A method of forming a fire barrier core structure as claimed in claim 1, wherein: in step S107, the vacuum brazing is divided into vacuum pumping, heating and cooling procedures,
wherein, the vacuum pumping is cold state vacuum pumping, so that the vacuum degree in the furnace reaches 2 multiplied by 10-2PerPa, working vacuum degree of 5X 10-2Pa; the heating procedure is that the mixture is heated to 900 ℃ at the speed of 300 ℃/h and is kept for 60 min; heating to 1010-1050 ℃ at the speed of 360 ℃/h for brazing; brazing is carried out at 1010-1050 ℃ for 10 min; the cooling procedure is that high-purity gas is filled into the furnace after the furnace is cooled to 600 ℃ in vacuum, so that the pressure in the furnace reaches 8 multiplied by 104After the pressure is/Pa, starting a fan to cool to 65 ℃ and discharging.
9. A method of forming a fire barrier core structure as claimed in claim 1, wherein: in step S303, the size of the finish turning is 4mm, and the length of the reserved wire cutting chuck is 12 mm.
10. A method of forming a fire barrier core structure as claimed in claim 1, wherein: in step S304, the total length of the wire cut firestop core structure blank is 63.5 mm.
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| JP2001047164A (en) * | 1999-08-03 | 2001-02-20 | Showa Aircraft Ind Co Ltd | Production of metal honeycomb |
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| CN112846648A (en) * | 2020-12-21 | 2021-05-28 | 苏州贝芯蜂窝科技有限公司 | Production process of high-strength honeycomb core |
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| JP2001047164A (en) * | 1999-08-03 | 2001-02-20 | Showa Aircraft Ind Co Ltd | Production of metal honeycomb |
| CN102226655A (en) * | 2011-05-11 | 2011-10-26 | 林志辉 | Honeycomb-bundle tubular heat exchanger and manufacturing process thereof |
| CN109175569A (en) * | 2018-11-08 | 2019-01-11 | 中国航空制造技术研究院 | A kind of preparation method of metal honeycomb core body |
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