阅读说明：本技术 一种蜂窝芯体制备方法 (Preparation method of honeycomb core ) 是由 王程成 刘洋 琚明 王伟 任小琛 董文军 于 2021-09-01 设计创作，主要内容包括：本发明涉及一种蜂窝芯体制备方法,该方法包括以下步骤：S1、将毛料外形切割成条带；S2、将条带冲压成型波纹条带,并在波纹条带两端均冲压多个线切定位槽；S3、对波纹条带的宽度进行线切；S4、对钎料的尺寸进行加工；S5、对波纹条带进行预置钎料；S6、将波纹条带分层装配在装配工装内,装配过程中将钎料粘接剂涂抹在钎料的侧面；S7、在波纹条带两端分别装配定位销；S8、将多层装配好的波纹条带夹紧固定并置入钎焊炉中钎焊成型芯格体；S9、拆除钎焊工装检验芯格体各芯格直径；S10、将芯格体切割成蜂窝芯体。通过该方法能够保证六方芯格对边距的尺寸和芯格间距,能够避免钎料附着蜂窝壁,能够避免蜂窝芯格钎焊变形。(The invention relates to a preparation method of a honeycomb core, which comprises the following steps: s1, cutting the profile of the wool into strips; s2, punching the strip into a corrugated strip, and punching a plurality of linear cutting positioning grooves at two ends of the corrugated strip; s3, performing line cutting on the width of the corrugated strip; s4, processing the size of the brazing filler metal; s5, presetting brazing filler metal for the corrugated strip; s6, assembling the corrugated strips in an assembly tool in a layering manner, and smearing brazing filler metal adhesive on the side surfaces of brazing filler metal in the assembly process; s7, respectively assembling positioning pins at two ends of the corrugated strip; s8, clamping and fixing the multilayer assembled corrugated strips and placing the corrugated strips into a brazing furnace to braze and form a core lattice body; s9, disassembling the brazing tool to check the diameter of each core lattice of the core lattice body; and S10, cutting the core lattice into honeycomb cores. By the method, the size of the hexagonal core lattice edge-to-edge distance and the core lattice spacing can be ensured, the brazing filler metal can be prevented from adhering to the honeycomb wall, and the honeycomb core lattice can be prevented from being deformed during brazing.)

1. A preparation method of a honeycomb core is characterized by comprising the following steps: the preparation method comprises the following steps:

s1, cutting the blanks by a wire, and cutting the blanks into strips by a wire cutting machine;

s2, stamping the strip into a corrugated strip 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 the corrugated strip respectively;

s3, linearly cutting the corrugated strip, and positioning the corrugated strip on a linear cutting tool by using a linear cutting positioning groove to cut the width of the corrugated strip;

s4, processing the brazing filler metal, positioning the brazing filler metal blank on a tool by utilizing a brazing filler metal processing tool, and cutting the brazing filler metal raw material into strip-shaped brazing filler metal;

s5, solder is preset, a solder preset tool is positioned on the corrugated strip, a strip-shaped solder is preset on the convex surface of the corrugated strip by the solder preset tool, the strip-shaped solder is positioned by spot welding by an energy storage spot welding machine, and solder adhesives are coated on the upper surface and the lower surface of the positioned strip-shaped solder;

s6, assembling the corrugated strips, sequentially assembling the corrugated strips after the step S105 in an assembly tool, turning the corrugated strips with the even number of the layer number by 180 degrees during assembly, and connecting the raised surfaces of the corrugated strips 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;

s7, assembling positioning pins, and inserting the positioning pins into the hexagonal holes at the two ends of the hexagonal hole core grid body corresponding to the positioning holes arranged on the assembling tool;

s8, brazing the corrugated strip, detaching the assembly tool from the hexagonal hole core lattice body, clamping and fixing the hexagonal hole core lattice body by using the brazing tool, and placing the hexagonal hole core lattice body in a brazing furnace for vacuum brazing;

s9, checking; removing the brazing tool to inspect the diameter of each core grid of the hexagonal core grid;

and S10, cutting the hexagonal cell core lattice body into a cylindrical micro-pore diameter honeycomb body after brazing.

2. A method of making a honeycomb core in accordance with claim 1, wherein: in step S1, the cut strip has a length of 110mm and a width of 400 mm.

3. A method of making a honeycomb core in accordance with claim 1, wherein: in step S2, the diameter of the inscribed circle of the corrugation groove of the corrugation strip is 1.55mm, and the depth of the corrugation groove is 0.75 mm; the center distance between every two adjacent corrugated grooves of the corrugated strip 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.

4. A method of making a honeycomb core in accordance with claim 1, wherein: in step S3, the width of the corrugated strip after wire cutting is 50 mm.

5. A method of making a honeycomb core in accordance with claim 1, wherein: in step S4, 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 making a honeycomb core in accordance with claim 1, wherein: in step S5, two ends of the strip solder are welded on the convex surface of the corrugated strip, two spot welding points are 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 close to the two ends of the strip solder, and the end edge of the strip solder is 4 mm.

7. A method of making a honeycomb core in accordance with claim 1, wherein: in step S7, the positioning pin has a diameter of 1.55mm and a length of 10 mm.

8. A method of making a honeycomb core in accordance with claim 1, wherein: in step S8, 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 making a honeycomb core in accordance with claim 1, wherein: in step S10, the micro-pore honeycomb body has a total length of 63.5mm and a diameter of 33 mm.

Technical Field

The invention belongs to the technical field of aero-engines, and particularly relates to a honeycomb core body preparation method.

Background

The honeycomb core body is a main component of the fire retardant core, the fire retardant core is a main component of a safety protection device of an aircraft engine fuel system, and the fire retardant core has the main function of preventing flame spread of atomized fuel gas and combustible gas. Therefore, the quality of the honeycomb core preparation directly affects the safety level of the fuel system of the aircraft engine. The honeycomb core body has the following difficulties in the preparation process at present:

a) the wall thickness of the core lattice is only 0.1, so that the size of the hexagonal core lattice to the side distance of 1.5 +/-0.05 is not easy to guarantee;

b) the core grids are inevitably staggered in the assembly process, and the spacing between the core grids is difficult to guarantee;

c) redundant brazing filler metal is easy to adhere to the honeycomb wall in the honeycomb core body brazing process, so that the size of a core grid is reduced;

d) the straightness accuracy of the inscribed circle phi 1.5 +/-0.05 of the hexagonal core lattice is not easy to guarantee due to the brazing deformation of the honeycomb core lattice.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a honeycomb core body preparation method, by which the size of the edge distance of hexagonal core grids and the spacing between the core grids can be ensured, brazing filler metal can be prevented from being attached to the honeycomb wall, and the brazing deformation of the honeycomb core grids can be avoided.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a method for preparing a honeycomb core, comprising the steps of:

s1, cutting the blanks by a wire, and cutting the blanks into strips by a wire cutting machine;

s2, stamping the strip into a corrugated strip 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 the corrugated strip respectively;

s3, linearly cutting the corrugated strip, and positioning the corrugated strip on a linear cutting tool by using a linear cutting positioning groove to cut the width of the corrugated strip;

s4, processing the brazing filler metal, positioning the brazing filler metal blank on a tool by utilizing a brazing filler metal processing tool, and cutting the brazing filler metal raw material into strip-shaped brazing filler metal;

s5, solder is preset, a solder preset tool is positioned on the corrugated strip, a strip-shaped solder is preset on the convex surface of the corrugated strip by the solder preset tool, the strip-shaped solder is positioned by spot welding by an energy storage spot welding machine, and solder adhesives are coated on the upper surface and the lower surface of the positioned strip-shaped solder;

s6, assembling the corrugated strips, sequentially assembling the corrugated strips after the step S105 in an assembly tool, turning the corrugated strips with the even number of the layer number by 180 degrees during assembly, and connecting the raised surfaces of the corrugated strips 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;

s7, assembling positioning pins, and inserting the positioning pins into the hexagonal holes at the two ends of the hexagonal hole core grid body corresponding to the positioning holes arranged on the assembling tool;

s8, brazing the corrugated strip, detaching the assembly tool from the hexagonal hole core lattice body, clamping and fixing the hexagonal hole core lattice body by using the brazing tool, and placing the hexagonal hole core lattice body in a brazing furnace for vacuum brazing;

s9, checking; removing the brazing tool to inspect the diameter of each core grid of the hexagonal core grid;

and S10, cutting the hexagonal cell core lattice body into a cylindrical micro-pore diameter honeycomb body after brazing.

Preferably, in step S1, the cut strip has a length of 110mm and a width of 400 mm.

Preferably, in step S2, the diameter of the inscribed circle of the corrugation groove of the corrugated strip is 1.55mm, and the depth of the corrugation groove is 0.75 mm; the center distance between every two adjacent corrugated grooves of the corrugated strip 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 S3, the width of the corrugated strip after wire cutting is 50 mm.

Preferably, in step S4, 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 S5, two ends of the strip solder are welded to the raised surface of the corrugated strip, two spot welding points are set at two ends of the strip solder, the distance between the two spot welding points is 5mm, and a spot welding point at two ends of the strip solder, which is close to two ends of the strip solder, is 4mm from the end edge of the strip solder.

Preferably, in step S7, the positioning pin has a diameter of 1.55mm and a length of 10 mm.

Preferably, in step S8, the vacuum brazing is performed 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 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 S10, the micro-pore honeycomb has a total length of 63.5mm and a diameter of 33 mm.

The invention has the technical effects and advantages that:

1. according to the honeycomb core body preparation method provided by the invention, the plurality of line cutting positioning grooves are punched at the two ends of the corrugated strip when the corrugated strip is punched, and the corrugated strip is positioned on the line cutting tool by utilizing the line cutting positioning grooves when the width line cutting of the corrugated strip is carried out, so that the dislocation in the line cutting process of the corrugated strip can be avoided, and the line cutting precision is effectively improved.

2. According to the preparation method of the honeycomb core body, the brazing filler metal adhesive is coated on the upper surface and the lower surface of the strip-shaped brazing filler metal, and each layer of assembled corrugated strip is fixed by the brazing filler metal adhesive, so that the displacement of the corrugated strip can be effectively limited, and the brazing precision is improved.

3. According to the honeycomb core body preparation method provided by the invention, the corrugated strip is clamped and fixed by the brazing tool, so that the corrugated strip can be prevented from shifting during brazing, and the brazing precision is improved; through set up the locating pin at hexagonal hole core check body both ends, can guarantee the straightness accuracy in hexagonal hole and the interval precision between each core check when brazing, improved the quality of brazing effectively.

4. According to the preparation method of the honeycomb core body, the brazing filler metal is processed before the brazing filler metal is preset, the using amount of the brazing filler metal can be reasonably controlled, and the problem that the size of a core grid is reduced and the using requirement of a product is influenced due to the fact that redundant brazing filler metal is attached to the wall of the core grid in the brazing process is avoided.

Drawings

FIG. 1 is a schematic view of the present invention for making a shaped honeycomb core;

FIG. 2 is a schematic view of the present invention of a corrugated strip stamped using a stamping die;

FIG. 3 is a schematic illustration of the present invention in line cutting width of a corrugated strip;

FIG. 4 is a schematic view of the present invention for pre-brazing filler metal to corrugated strip;

FIG. 5 is a schematic view of the present invention assembling the ends of a corrugated strip with locating pins;

FIG. 6 is a schematic view of the present invention with the corrugated strip assembled into a brazing tool;

figure 7 is a schematic illustration of the present invention cutting a honeycomb core from a lattice.

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 method for preparing a honeycomb core includes the following steps:

and S1, cutting the blanks by using a wire cutting machine into strips.

The cut strip was 110mm in length and 400mm in width.

In specific implementation, the selected blank material is 0Cr18Nil0Ti0 stainless steel, and the thickness of the blank material is 0.1 mm.

S2, stamping the strip into a corrugated strip by adopting a stamping die with a stamping surface having a smooth finish of Ra0.8um, stamping a plurality of linear cutting positioning grooves at two ends of the corrugated strip respectively,

the diameter of an inscribed circle of a corrugated groove of the corrugated strip 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 strip is 2.9 mm.

The width of the line cutting positioning groove at two ends is 3.1mm, and the depth is 3 mm.

The distance between each line cutting positioning groove and the adjacent line cutting positioning groove is 5.7 mm.

In specific implementation, the polished finish degree of the stamping surface of the die is Ra0.8um, so that the phenomenon that the surface of a corrugated strip is indented in the stamping process to influence the surface quality of the corrugated strip is avoided.

And S3, wire-cutting the corrugated strip, and positioning the corrugated strip on a wire-cutting tool by using a wire-cutting positioning groove to cut the width of the corrugated strip.

The width of the corrugated strip after wire cutting is 50 mm.

When the honeycomb strip line cutting device is specifically implemented, the honeycomb strip is positioned on the line cutting tool by the line cutting positioning groove, dislocation in the honeycomb strip line cutting process can be avoided, and the line cutting precision is improved.

And S4, processing the brazing filler metal, positioning the brazing filler metal blank on a tool by utilizing a brazing filler metal processing tool, 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 processing method is specifically implemented, the brazing filler metal raw materials are cut into strip-shaped brazing filler metals, the using amount of the brazing filler metals can be reasonably controlled, the situation that the redundant brazing filler metals are attached to the wall of the core lattice in the brazing process, the size of the core lattice is reduced, and the processing precision is effectively improved.

And S5, solder is preset, a solder preset tool is positioned on the corrugated strip, the solder preset tool is used for presetting the strip-shaped solder on the convex surface of the corrugated strip, an energy storage spot welding machine is used for spot welding and positioning the strip-shaped solder, and solder adhesives are coated on the upper surface and the lower surface of the positioned strip-shaped solder.

Two ends of the strip-shaped brazing filler metal are welded on the convex surface of the corrugated strip, 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 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 strip is fixed by the brazing filler metal adhesive, so that the displacement of the corrugated strip can be effectively limited, and the brazing precision is improved.

And S6, assembling the corrugated strips, sequentially assembling the corrugated strips after the step S105 in an assembly tool, turning the corrugated strips with the even number of the layer number by 180 degrees during assembly, and connecting the raised surfaces of the corrugated strips turned by 180 degrees with the strip-shaped brazing filler metal on the raised surfaces of the lower layer to form the hexagonal hole core lattice.

And S7, assembling positioning pins, and inserting the positioning pins into the hexagonal holes at the two ends of the hexagonal hole core lattice body corresponding to the positioning holes formed in the assembling tool.

The diameter of the positioning pin is 1.55mm, and the length of the positioning pin is 10 mm.

During specific implementation, the positioning pins are arranged at the two ends of the hexagonal hole core lattice body, so that the spacing precision among the core lattices during multi-layer corrugated strip brazing can be effectively improved.

S8, brazing the corrugated strip, detaching the assembly tool from the hexagonal hole core lattice body, clamping and fixing the hexagonal hole core lattice body by using the brazing tool, and placing the hexagonal hole core lattice body in a brazing furnace for vacuum brazing.

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 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/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%。

S9, checking; and (4) removing the brazing tool from the hexagonal hole core lattice body to test the diameter of each core lattice of the hexagonal hole core lattice body.

In the specific implementation, the outer diameter of the hexagonal hole core grid is tested by adopting 0-150 calipers to be ∅ 33+0/-0.1, and the straightness of the hexagonal hole to the outer circle is tested by adopting a height gauge and a ∅ 1.45.45 gauge to be not more than 0.1.

S10, cutting the brazed hexagonal cell core 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.

Therefore, the method of the embodiment can ensure the size of the hexagonal core grid to the distance of 1.5 +/-0.05 and the core grid distance, can avoid the problem that the size of the core grid is reduced due to the fact that brazing filler metal is attached to the honeycomb wall, and can avoid the problem that the straightness of the inscribed circle phi 1.5 +/-0.05 of the hexagonal core grid is not easy to ensure due to the fact that the honeycomb core grid is deformed by brazing.

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.