Aero-engine pipeline coating method based on stainless steel band

Abstract

The invention discloses an aero-engine pipeline coating method based on a stainless steel band, and belongs to the technical field of aero-engine part manufacturing. Determining a pipeline coating area; a self-made stainless steel lining is mounted on the pipeline; the wrapping area is wrapped with heat insulation cotton felt, and the end of the heat insulation cotton felt is inserted into a stainless steel lining; the heat insulation cotton felt is wound and wrapped with a glass fiber tape, and the glass fiber tape is inserted into the stainless steel lining; the glass fiber tape is coated with a knurled stainless steel tape, and the end of the knurled stainless steel tape is coated outside the stainless steel lining; hoops are installed outside the knurled stainless steel band at intervals, and the knurled stainless steel band, the glass fiber band and the heat insulation cotton felt are pressed and fixed to the pipeline through the hoops; the annular wrapping closed seam between the end of the knurled stainless steel band and the stainless steel lining is fixed through spot welding. By the adoption of the pipeline wrapping device, the glass fiber tape and the heat insulation cotton felt can be protected through the stainless steel tape, the appearance quality of the wrapped pipeline can be improved, and the wrapping efficiency is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of manufacturing parts of aero engines, and particularly relates to a method for wrapping an aero engine pipeline based on a stainless steel strip. Background Art

[0002] Currently, in order to improve the heat insulation performance of an aero engine pipeline, the common practice is to first wrap heat insulation felt around the outside of the pipeline, then wind and wrap a glass fiber tape around the outside of the heat insulation felt, and finally paint the outer surface of the glass fiber tape.

[0003] However, the above traditional method for wrapping an aero engine pipeline has the following deficiencies: ①, the glass fiber tape and the heat insulation felt lack protection; ②, the appearance quality after wrapping the pipeline is relatively poor. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the present invention provides a method for wrapping an aero engine pipeline based on a stainless steel strip, which can not only provide protection for the glass fiber tape and the heat insulation felt through the stainless steel strip, but also improve the appearance quality after wrapping the pipeline, and at the same time has the characteristics of high wrapping efficiency.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A method for wrapping an aero engine pipeline based on a stainless steel strip, comprising the following steps: Step 1: Prepare the raw materials for pipeline wrapping, including heat insulation felt, glass fiber tape, stainless steel bushing, knurled stainless steel strip and clamp; among them, the stainless steel bushing and the knurled stainless steel strip are self-made parts; Step 2: Determine the wrapping area on the pipeline by scribing; Step 3: Position and sleeved the stainless steel bushing onto the pipeline at the scribed position, and the annular limiting groove of the stainless steel bushing faces the wrapping area; Step 4: Complete the wrapping of the heat insulation felt on the pipeline in the wrapping area, and insert the end of the heat insulation felt into the annular limiting groove of the stainless steel bushing for fixation; Step 5: Wind and wrap the glass fiber tape around the outside of the heat insulation felt, and insert the end of the glass fiber tape into the annular limiting groove of the stainless steel bushing for fixation; Step 6: Complete the wrapping of the knurled stainless steel strip around the outside of the glass fiber tape, and the end part of the knurled stainless steel strip is simultaneously wrapped around the outside of the stainless steel bushing; Step 7: Install clamps at intervals on the outside of the knurled stainless steel strip, and use the clamps to press and fix the knurled stainless steel strip, the glass fiber tape and the heat insulation felt on the pipeline; Step 8: Fix the annular wrapping closed joint between the end of the knurled stainless steel strip and the stainless steel bushing by spot welding, and at this time, the wrapping work of the pipeline is completed.

[0006] When the knurled stainless steel strip wraps the pipeline along the circumferential direction, the overlapping width of the two edges of the knurled stainless steel strip is not less than 5 mm.

[0007] The stainless steel bushing is made of a stainless steel circular sheet by a die pressing process.

[0008] The stainless steel circular sheet is equipped with a die forming mold for the stainless steel bushing.

[0009] The die forming mold for the stainless steel bushing includes a lower die, a middle die and an upper die; the lower die adopts a cylindrical structure, the middle die adopts a stepped cylindrical structure, the lower die is coaxially sleeved outside the middle die, and a forming cavity for the stainless steel bushing is formed between the lower die and the middle die; the upper die adopts a cylindrical structure and is used in cooperation with the forming cavity for the stainless steel bushing.

[0010] The knurled stainless steel strip is made of an unknurled stainless steel strip by a rolling process.

[0011] The unknurled stainless steel strip is equipped with a rolling device for the knurled stainless steel strip.

[0012] The rolling device for the knurled stainless steel strip includes a base, a first support seat, a second support seat, a driving knurling roller, a driven knurling roller, a rocking handle, a first limiting baffle and a second limiting baffle; the first support seat and the second support seat are vertically and fixedly installed side by side on the base; the driving knurling roller is horizontally arranged between the first support seat and the second support seat, and both ends of the wheel shaft of the driving knurling roller are rotatably connected to the first support seat and the second support seat through bearings respectively; the rocking handle is fixedly connected to one end of the wheel shaft of the driving knurling roller; the driven knurling roller is located above the driving knurling roller and is horizontally arranged between the first support seat and the second support seat, the driven knurling roller is parallel to the driving knurling roller, and both ends of the wheel shaft of the driven knurling roller are rotatably connected to the first support seat and the second support seat through bearings respectively; a knurling forming gap is formed between the driving knurling roller and the driven knurling roller; the first limiting baffle is horizontally provided with a first pair of parallel long slots, the first pair of parallel long slots are provided with a first pair of parallel fastening and guiding limit screws, and the first limiting baffle is connected to the first support seat through the first pair of parallel fastening and guiding limit screws; the second limiting baffle is horizontally provided with a second pair of parallel long slots, the second pair of parallel long slots are provided with a second pair of parallel fastening and guiding limit screws, and the second limiting baffle is connected to the second support seat through the second pair of parallel fastening and guiding limit screws.

[0013] The beneficial effects of the present invention: The method for wrapping an aeroengine pipeline based on a stainless steel strip according to the present invention can not only provide protection for the fiberglass tape and the heat insulation cotton felt by the stainless steel strip, but also improve the appearance quality of the wrapped pipeline, and at the same time has the characteristics of high wrapping efficiency. Brief Description of the Drawings

[0014] Figure 1 It is the rendering of the pipeline coating after the pipeline coating method of the present invention based on a stainless steel strip; Figure 2 is Figure 1 the A-A cross-sectional view in Figure 3 It is the schematic diagram of the structure before the mold closing of the die for pressing and forming the stainless steel bushing of the present invention; Figure 4 It is the schematic diagram of the structure after the mold closing of the die for pressing and forming the stainless steel bushing of the present invention; Figure 5 It is the schematic diagram of the structure of the knurled stainless steel strip rolling forming device of the present invention; In the figure, 1 - pipeline, 2 - heat insulation cotton felt, 3 - glass fiber tape, 4 - stainless steel bushing, 5 - knurled stainless steel strip, 6 - clamp, 7 - stainless steel circular ring piece, 8 - lower die, 9 - middle die, 10 - upper die, 11 - stainless steel bushing forming cavity, 12 - base, 13 - first support seat, 14 - second support seat, 15 - active knurling roller, 16 - driven knurling roller, 17 - crank handle, 18 - first limit baffle, 19 - second limit baffle, 20 - first parallel double long slots, 21 - first parallel double fastening guiding and limiting screws, 22 - second parallel double long slots, 23 - second parallel double fastening guiding and limiting screws. Detailed Description of the Invention

[0015] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0016] A pipeline coating method for an aeroengine based on a stainless steel strip includes the following steps: Step 1: Prepare the raw materials for coating the pipeline 1, including heat insulation cotton felt 2, glass fiber tape 3, stainless steel bushing 4, knurled stainless steel strip 5 and clamp 6; among them, the stainless steel bushing 4 and the knurled stainless steel strip 5 are self-made parts; Step 2: Determine the coating area on the pipeline 1 by scribing; Step 3: Position and sleeve the stainless steel bushing 4 onto the pipeline 1 at the scribed position, and the annular limiting groove of the stainless steel bushing 4 faces the coating area; Step 4: Complete the coating of the heat insulation cotton felt 2 on the pipeline 1 in the coating area, and insert the end of the heat insulation cotton felt 2 into the annular limiting groove of the stainless steel bushing 4 for fixation; Step 5: Wind and wrap the glass fiber tape 3 outside the heat insulation cotton felt 2, and insert the end of the glass fiber tape 3 into the annular limiting groove of the stainless steel bushing 4 for fixation; Step Six: Wrap the knurled stainless steel strip 5 outside the fiberglass tape 3, and the end part of the knurled stainless steel strip 5 is also wrapped outside the stainless steel bushing 4; Step Seven: Install the clamps 6 at intervals outside the knurled stainless steel strip 5, and use the clamps 6 to press and fix the knurled stainless steel strip 5, the fiberglass tape 3 and the heat insulation felt 2 on the pipeline 1; Step Eight: Fix the annular wrapped closed joint between the end of the knurled stainless steel strip 5 and the stainless steel bushing 4 by spot welding. At this time, the wrapping work of the pipeline 1 is completed, and the effect drawing after wrapping the pipeline 1 is as Figure 1 、 2 shown.

[0017] When the knurled stainless steel strip 5 wraps the pipeline 1 along the circumferential direction, the overlapping width of the two edges of the knurled stainless steel strip 5 is not less than 5 mm.

[0018] The stainless steel bushing 4 is made of a stainless steel circular ring sheet 7 by a die pressing process.

[0019] The stainless steel circular ring sheet 7 is equipped with a die for forming the stainless steel bushing.

[0020] As Figure 3 、 4 shown, the die for forming the stainless steel bushing includes a lower die 8, a middle die 9 and an upper die 10; the lower die 8 adopts a cylindrical structure, the middle die 9 adopts a stepped cylindrical structure, the lower die 8 is coaxially sleeved outside the middle die 9, and a stainless steel bushing forming cavity 11 is formed between the lower die 8 and the middle die 9; the upper die 10 adopts a cylindrical structure and is used in cooperation with the stainless steel bushing forming cavity 11.

[0021] Specifically, first, put the stainless steel circular ring sheet 7 on the middle die 9 until the stainless steel circular ring sheet 7 covers directly above the stainless steel bushing forming cavity 11. Then, control the upper die 10 to descend until the upper die 10 presses the stainless steel circular ring sheet 7 into the stainless steel bushing forming cavity 11. Finally, press the stainless steel circular ring sheet 7 into the stainless steel bushing 4, and then lift the upper die 10 to take out the formed stainless steel bushing 4 from the stainless steel bushing forming cavity 11.

[0022] The knurled stainless steel strip 5 is made of a non-knurled stainless steel strip by a rolling forming process.

[0023] The non-knurled stainless steel strip is equipped with a rolling forming device for the knurled stainless steel strip.

[0024] As Figure 5As shown in the figure, the knurled stainless steel strip rolling and forming device includes a base 12, a first support seat 13, a second support seat 14, a driving knurling roller 15, a driven knurling roller 16, a hand crank 17, a first limit baffle 18 and a second limit baffle 19. The first support seat 13 and the second support seat 14 are fixedly installed vertically side by side on the base 12. The driving knurling roller 15 is horizontally arranged between the first support seat 13 and the second support seat 14, and both ends of the axle of the driving knurling roller 15 are rotatably connected to the first support seat 13 and the second support seat 14 respectively through bearings. The hand crank 17 is fixedly connected to one end of the axle of the driving knurling roller 15. The driven knurling roller 16 is located above the driving knurling roller 15 and is horizontally arranged between the first support seat 13 and the second support seat 14. The driven knurling roller 16 is distributed in parallel with the driving knurling roller 15, and both ends of the axle of the driven knurling roller 16 are rotatably connected to the first support seat 13 and the second support seat 14 respectively through bearings. A knurling forming gap is formed between the driving knurling roller 15 and the driven knurling roller 16. The first limit baffle 18 is horizontally provided with a first pair of parallel long strip holes 20, and the first pair of parallel long strip holes 20 are provided with a first pair of parallel double fastening and guiding limit screws 21. The first limit baffle 18 is connected to the first support seat 13 through the first pair of parallel double fastening and guiding limit screws 21. The second limit baffle 19 is horizontally provided with a second pair of parallel long strip holes 22, and the second pair of parallel long strip holes 22 are provided with a second pair of parallel double fastening and guiding limit screws 23. The second limit baffle 19 is connected to the second support seat 14 through the second pair of parallel double fastening and guiding limit screws 23.

[0025] Specifically, pull out an appropriate length of non-knurled stainless steel strip from the purchased stainless steel strip coil. First, cut the length of the initial non-knurled stainless steel strip according to the length of the covering area on the pipeline 1. Then, cut the width of the initial non-knurled stainless steel strip according to the diameter of the pipeline 1 and the overlapping width of the two side edges of the knurled stainless steel strip 5 during covering. Subsequently, insert one end of the cut non-knurled stainless steel strip into the knurling forming gap between the driving knurling roller 15 and the driven knurling roller 16. Then, adjust the distance between the first limit baffle 18 and the second limit baffle 19 so that the first limit baffle 18 and the second limit baffle 19 limit the non-knurled stainless steel strip in the width direction. Finally, rotate the hand crank 17 to drive the driving knurling roller 15 to rotate. Drive the non-knurled stainless steel strip to pass through the knurling forming gap through the rotating driving knurling roller 15. At this time, the driven knurling roller 16 rotates as a follower. When the non-knurled stainless steel strip passes through the knurling forming gap, knurling patterns will be formed on the surface of the steel strip. The existence of the knurling patterns can prevent the knurled stainless steel strip 5 from collapsing after covering and ensure the fastening degree of covering. When the non-knurled stainless steel strip completely passes through the knurling forming gap, the production of the knurled stainless steel strip 5 is completed.

[0026] The solutions in the embodiments are not intended to limit the protection scope of the present invention. Any equivalent implementation or modification without departing from the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for covering an aeroengine pipeline based on a stainless steel strip, characterized in that It includes the following steps: Step 1: Prepare the raw materials for pipeline coating, including heat insulation cotton felt, fiberglass tape, stainless steel bushing, knurled stainless steel tape and clamp; among them, the stainless steel bushing and the knurled stainless steel tape are self-made parts; Step 2: Determine the coating area on the pipeline by scribing; Step 3: Position and sleeve the stainless steel bushing onto the pipeline at the scribed position, and the annular limiting groove of the stainless steel bushing faces the coating area; Step 4: Complete the coating of the heat insulation cotton felt on the pipeline in the coating area, and insert the end of the heat insulation cotton felt into the annular limiting groove of the stainless steel bushing for fixation; Step 5: Wrap the fiberglass tape around the outside of the heat insulation cotton felt, and insert the end of the fiberglass tape into the annular limiting groove of the stainless steel bushing for fixation; Step 6: Complete the coating of the knurled stainless steel tape on the outside of the fiberglass tape, and the end part of the knurled stainless steel tape is simultaneously coated on the outside of the stainless steel bushing; Step 7: Install the clamps at intervals on the outside of the knurled stainless steel tape, and use the clamps to press and fix the knurled stainless steel tape, fiberglass tape and heat insulation cotton felt on the pipeline; Step 8: Fix the annular coating closing joint between the end of the knurled stainless steel tape and the stainless steel bushing by spot welding, and at this time the coating work of the pipeline is completed.

2. A method for covering an aeroengine pipeline based on a stainless steel strip according to claim 1, characterized in that: When the knurled stainless steel tape wraps the pipeline in the circumferential direction, the overlapping width of the two edges of the knurled stainless steel tape is not less than 5 mm.

3. A method for coating an aero-engine pipeline based on a stainless steel strip according to claim 1, characterized in that: The stainless steel bushing is made of a stainless steel circular ring by a die pressing process.

4. A method for coating an aero-engine pipeline based on a stainless steel strip according to claim 3, characterized in that: The stainless steel circular ring is equipped with a die for forming the stainless steel bushing.

5. A method for coating an aeroengine pipeline based on a stainless steel strip according to claim 4, characterized in that: The die for forming the stainless steel bushing includes a lower die, a middle die and an upper die; the lower die adopts a cylindrical structure, the middle die adopts a stepped cylindrical structure, the lower die is coaxially sleeved outside the middle die, and a stainless steel bushing forming cavity is formed between the lower die and the middle die; the upper die adopts a cylindrical structure and is used in cooperation with the stainless steel bushing forming cavity.

6. A method for covering an aero-engine pipeline based on a stainless steel strip according to claim 1, characterized in that: The knurled stainless steel tape is made of a non-knurled stainless steel tape by a rolling process.

7. A method for coating an aero-engine pipeline based on a stainless steel strip according to claim 6, characterized in that: The non-knurled stainless steel tape is equipped with a device for rolling and forming the knurled stainless steel tape.

8. A method for coating an aeroengine pipeline based on a stainless steel strip according to claim 7, characterized in that: The knurled stainless steel strip rolling and forming device comprises a base, a first support seat, a second support seat, a driving knurling roller, a driven knurling roller, a hand crank, a first limit baffle and a second limit baffle; the first support seat and the second support seat are fixedly installed vertically side by side on the base; the driving knurling roller is horizontally arranged between the first support seat and the second support seat, and both ends of the axle of the driving knurling roller are rotatably connected to the first support seat and the second support seat respectively through bearings; the hand crank is fixedly connected to one end of the axle of the driving knurling roller; the driven knurling roller is located above the driving knurling roller and is horizontally arranged between the first support seat and the second support seat, the driven knurling roller and the driving knurling roller are distributed in parallel, and both ends of the axle of the driven knurling roller are rotatably connected to the first support seat and the second support seat respectively through bearings; a knurling forming gap is formed between the driving knurling roller and the driven knurling roller; the first limit baffle is horizontally provided with a first pair of parallel long strip holes, the first pair of parallel long strip holes are provided with a first pair of parallel double fastening guiding and limiting screws, and the first limit baffle is connected to the first support seat through the first pair of parallel double fastening guiding and limiting screws; the second limit baffle is horizontally provided with a second pair of parallel long strip holes, the second pair of parallel long strip holes are provided with a second pair of parallel double fastening guiding and limiting screws, and the second limit baffle is connected to the second support seat through the second pair of parallel double fastening guiding and limiting screws.

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