A fixture and method for assembling a bow frame for a special-shaped heat insulation screen

Abstract

A fixture and method for assembling a profiled heat shield with a bow frame. The rivet holes on the heat shield are not machined yet. Bottom holes are first machined at the locations of the rivet holes on the end and middle bow frames. The heat shield is mounted on the fixture and supported by end and middle blocks, so that the end of the heat shield abuts against the block. A positioning pin is inserted into a through hole of the heat shield, and the heat shield is positioned by a tightening pin. Simultaneously, the end of a positioning rod is inserted into the bow frame positioning hole of the end bow frame to fix the end bow frame. The middle bow frame is positioned by a flap and a transverse column on the flap being clamped to the bow frame notch of the middle bow frame. The end and middle bow frames are compressed by a tightening screw, and the heat shield can be compressed together. The present invention can quickly clamp and position parts, control the position of the heat shield and bow frame, and meet subsequent assembly requirements.

Description

Technical Field

[0001] The present invention relates to the field of welding of aerospace engine parts, and in particular to a fixture and a method for assembling a bow frame of a heat shield with a special-shaped surface. Background Art

[0002] The parts to be processed in the present invention are Figure 1 、 Figure 2 The profiled heat shield shown is composed of a heat shield 101 and multiple brackets riveted together using rivets 106. The brackets are used to connect to the casing. The brackets include end brackets 102 positioned at either end of the heat shield 101 and multiple middle brackets 103 positioned between the two end brackets 102. Each end bracket 102 is provided with a bracket positioning hole 104, and each middle bracket 103 is provided with a bend 108. A bracket notch 105 is formed between the two bends 108. The heat shield 101 is provided with a row of through holes 107.

[0003] The aforementioned irregularly shaped heat shield makes it difficult to maintain the correct positioning of the holes on the bow during assembly, hindering subsequent assembly. The irregular and thin-walled profile of this type of heat shield results in poor conformity between the heat shield 101 and the bow during molding, making it difficult to align the two parts. Furthermore, the misaligned rivet hole datums produced by each component make it difficult to align the holes, hindering riveting. After riveting, the connecting holes on the bow are difficult to maintain in position, resulting in problems with subsequent assembly with the receiver. Summary of the Invention

[0004] The main purpose of the present invention is to provide a fixture and method for assembling a bow frame of a special-shaped heat insulation screen, so as to ensure the consistency of riveting and the position accuracy of the holes on the bow frame, and to solve the above technical problems.

[0005] To achieve the above-mentioned object, the present invention proposes a fixture for assembling a bow frame for a special-shaped heat insulation screen, comprising: a base; end blocks arranged at positions near both ends of the base; a plurality of middle blocks arranged at the base; the positions of the end blocks and the middle blocks are consistent with the positions of the assembly bow frame, and the top profile is consistent with the inner profile of the heat insulation screen; a stopper is provided on the outer surface of one of the end blocks, and a positioning pin is provided on the bottom profile of the end block; an end support is provided at the outer position of the end block, and the end support is fixed to the base; a A positioning rod is provided, and the end of the positioning rod is used to be inserted into the bow frame positioning hole of the end bow frame and fix the end bow frame; a tightening pin is provided on the end support away from the stop block; side supports are respectively provided at both ends of the end block and the middle block, and the side supports are fixed on the base; a flap is installed on the side support through a rotating shaft, a locking structure is provided on the side support for locking the flap, and a clamping screw is provided on the flap for clamping the bow frame; a transverse column is provided on the end of the flap corresponding to the middle block away from the rotating shaft, and the transverse column is used to clamp on the bow frame slot.

[0006] Preferably, the locking structure includes a locking beam and a waist-shaped groove on the flap, the locking beam is connected to the side support through a screw, and the screw is passed through the waist-shaped groove.

[0007] Preferably, when the locking beam is parallel to the waist-shaped groove and the flap rotates around the rotation axis, the locking beam can pass through the waist-shaped groove.

[0008] Preferably, hanging rings are provided at the four corners of the base; and a handle rod is provided at the head of the clamping screw.

[0009] Preferably, a sliding portion is provided on the positioning rod, the sliding portion slidingly cooperates with the end support, and a longitudinal groove is provided on the sliding portion; a set screw is provided on the end support, and when the set screw is tightened, the set screw abuts against the longitudinal groove.

[0010] Preferably, a tangent plane is provided on the cylindrical surface of the positioning rod located outside the end support, and the tangent plane is in the same angular direction as the longitudinal groove.

[0011] Preferably, one end of the positioning rod is provided with an insertion portion and a screw portion, and the insertion portion is used to be inserted into the bow frame positioning hole of the end bow frame; the diameter of the insertion portion is smaller than the rod body of the positioning rod to form a limiting step, and a locking nut is provided on the screw portion for locking the end bow frame.

[0012] The fixture for assembling a bow frame for a special-shaped heat insulation screen as described in claim 1 is characterized in that a limit stop ring is provided on the positioning rod and a hanging hole is provided on the positioning rod.

[0013] Preferably, the flatness of the upper stop surface of the stop block is 0.02-0.06; one of the side surfaces of the flap corresponding to the middle block is set as a positioning stop surface to limit the upper bending portion of the middle bow frame.

[0014] On the other hand, the present invention also provides a method for assembling a bow frame of a heat shield with a special-shaped surface, using the above-mentioned fixture, comprising the following steps:

[0015] Step S1: The rivet holes on the heat shield are not processed yet, and bottom holes are first processed at the rivet hole positions on the end arch frame and the middle arch frame;

[0016] Step S2: Install the heat shield on the fixture and support it with the end blocks and the middle blocks so that the end of the heat shield abuts against the stop block. Insert a positioning pin into a through hole of the heat shield and tighten the locking pin.

[0017] Step S3: Assemble the end frames and the middle frame in sequence, insert the end of the positioning rod into the frame positioning hole of the end frame and fix the end frame; flip the flap and clamp it to the frame notch of the middle frame using the transverse column; lock the flap with the locking structure; tighten the clamping screw to compress the end frame and the middle frame;

[0018] Step S4: Using argon arc welding to position the bow frame, each bow frame is staggered left and right, and 6 to 10 points are positioned on one side;

[0019] Step S5: Remove the parts and use a radial drill to drill the bottom hole on the bow frame to the required size of the rivet hole;

[0020] Step S6: After drilling, polish and remove the positioning welding points and burrs;

[0021] Step S7: Riveting is performed using a riveting machine.

[0022] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0023] (1) In the present invention, the rivet holes on the heat shield are not processed yet, and bottom holes are first processed at the positions of the rivet holes on the end frame and the middle frame. The heat shield is mounted on the fixture provided by the present invention, and supported by the end block and the middle block, so that the end of the heat shield is against the block, and a positioning pin is inserted into a through hole of the heat shield, and the heat shield can be positioned by the top pin. At the same time, the end of the positioning rod is inserted into the frame positioning hole of the end frame and the end frame is fixed. The middle frame is positioned by the flip plate and the horizontal column on the flip plate being clamped on the frame slot of the middle frame. The heat shield can be compressed together with the compression screw while the end frame and the middle frame are compressed. The present invention can quickly clamp and position the parts, control the position of the heat shield and the frame, and ensure the subsequent assembly requirements.

[0024] (2) The fixture provided by the present invention is used to ensure that the heat insulation screen and the bow frame are assembled according to the theoretical position, and then argon arc welding is used for positioning to ensure that the heat insulation screen and the bow frame are not offset. The rivet holes on the heat insulation screen are not processed first, and the holes on the bow frame are used for matching drilling to ensure the consistency of riveting and the position of the holes on the bow frame.

[0025] (3) The method of assembling the bow frame of the present invention can be used to match the heat shield parts with special-shaped surfaces, ensure the consistency of the rivet holes, and prevent the shear force caused by the misalignment of the rivet holes; BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0027] Figure 1 This is a front view of the heat shield part with a special-shaped surface to be processed by the present invention;

[0028] Figure 2 for Figure 1 Cross-sectional view along BB;

[0029] Figure 3 A top view of a fixture for assembling a bow frame for a heat shield with a special-shaped surface provided by the present invention;

[0030] Figure 4 A three-dimensional structural diagram of a fixture for assembling a bow frame for a heat shield with a special-shaped surface provided by the present invention;

[0031] Figure 5 A three-dimensional structural diagram of the fixture for mounting the bow frame of the special-shaped heat insulation screen provided by the present invention from another direction;

[0032] Figure 6 for Figure 3 Cross-sectional view along CC;

[0033] Figure 7 for Figure 3 Cross-sectional view along DD;

[0034] Figure 8 Schematic diagram of the structure of the positioning rod in the present invention;

[0035] Figure 9 for Figure 8 Cross-sectional view along EE.

[0036] Explanation of the accompanying numbers: 1. Base; 2. End block; 3. Middle block; 4. Positioning rod; 401. Sliding part; 402. Longitudinal groove; 403. Set screw; 404. Insertion part; 405. Screw part; 406. Limiting ring; 407. Cutting plane; 408. Hanging hole; 5. Block; 6. Horizontal column; 7. Waist groove; 8. End support; 9. Side support; 10. Flap; 11. Clamping screw; 12. Positioning pin; 13. Clamping pin; 14. Lifting ring; 15. Locking beam; 16. Handle bar; 101. Heat insulation screen; 102. End bow frame; 103. Middle bow frame; 104. Bow frame positioning hole; 105. Bow frame slot; 106. Rivet; 107. Through hole; 108. Bending part. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] Combine Figure 1 、 Figure 2 The present invention illustrates a heat shield component with a special profile. This component consists of a heat shield 101 and multiple brackets riveted together using rivets 106. The brackets are used to connect to the casing. The brackets include end brackets 102 positioned at either end of the heat shield 101 and multiple middle brackets 103 positioned between the two end brackets 102. Specifically, in this embodiment, there are two middle brackets 103. Each end bracket 102 is provided with a bracket positioning hole 104. The two plates on the middle brackets 103 are connected by a bend 108. A bracket notch 105 is formed between the two bends 108. A row of through-holes 107 is provided in the heat shield 101.

[0040] Combine Figures 3 to 7As shown, a fixture for assembling a bow frame for a profiled heat shield provided by the present invention comprises: a base 1; end blocks 2 arranged on the base 1 near both ends; a plurality of middle blocks 3 arranged on the base 1; the positions of the end blocks 2 and the middle blocks 3 are consistent with the positions of the assembly bow frame, and the top profile is consistent with the inner profile of the heat shield 101; a stopper 5 is provided on the outer surface of one of the end blocks 2, and a positioning pin 12 is provided on the bottom profile of the end block 2; an end support 8 is provided at the outer position of the end block 2, and the end support 8 is fixed to the base 1; a positioning rod 4 is provided on the end support 8 for positioning The end of the rod 4 is used to be inserted into the bow frame positioning hole 104 of the end bow frame 102 and fix the end bow frame 102; a tightening pin 13 is provided on the end support 8 away from the stop block 5; side supports 9 are respectively provided at both ends of the end block 2 and the middle block 3, and the side supports 9 are fixed on the base 1; a flap 10 is installed on the side support 9 through a rotating shaft, and a locking structure is provided on the side support 9 for locking the flap 10, and a clamping screw 11 is provided on the flap 10 for clamping the bow frame; a transverse column 6 is provided on the end of the flap 10 corresponding to the middle block 3 away from the rotating shaft, and the transverse column 6 is used to be clamped on the bow frame slot 105.

[0041] In this embodiment, the locking structure includes a locking beam 15 and a waist-shaped groove 7 on the flap 10. The locking beam 15 is connected to the side support 9 by a screw, and the screw is inserted into the waist-shaped groove 7. Furthermore, when the locking beam 15 is parallel to the waist-shaped groove 7 and the flap 10 rotates about the rotation axis, the locking beam 15 can pass through the waist-shaped groove 7.

[0042] In this embodiment, lifting rings 14 are provided at the four corners of the base 1 to facilitate lifting the entire clamp; a handle rod 16 is provided at the head of the clamping screw 11 to facilitate tightening the clamping screw 11.

[0043] In this embodiment, the positioning rod 4 is provided with a sliding portion 401 that slidably engages with the end support 8. A longitudinal groove 402 is provided on the sliding portion 401. A set screw 403 is provided on the end support 8. When the set screw 403 is tightened, it abuts against the longitudinal groove 402. The sliding portion 401 and the end support 8 facilitate adjustment of the axial position of the positioning rod 4.

[0044] Furthermore, a tangent plane 407 is provided on the cylindrical surface of the positioning rod 4 outside the end support 8, and the tangent plane 407 is at the same angular direction as the longitudinal groove 402. The provision of the tangent plane 407 facilitates indicating the angular direction of the longitudinal groove 402. That is, when the normal direction of the tangent plane 407 is vertically upward, the normal direction of the longitudinal groove 402 is also vertically upward, facilitating the tightening of the set screw 403.

[0045] Combine Figure 8 、 Figure 9 As shown, one end of the positioning rod 4 is provided with an insertion portion 404 and a screw portion 405, and the insertion portion 404 is used to be inserted into the bow frame positioning hole 104 of the end bow frame 102; the diameter of the insertion portion 404 is smaller than the rod body of the positioning rod 4 to form a limiting step, and a locking nut is provided on the screw portion 405 for locking the end bow frame 102.

[0046] Positioning rod 4 is provided with a limit ring 406 and a hanging hole 408. The limit ring 406 is used to limit the axial position of positioning rod 4 when inserted into end support 8, preventing damage to end bracket 102 caused by excessive insertion. The hanging hole 408 facilitates the centralized management of positioning rods 4 by allowing them to be hung up using wire threaded through the hanging hole 408 after removal.

[0047] In this embodiment, the flatness of the stop surface of the stop block 5 is 0.02-0.06.

[0048] Combine Figure 4 As shown, one of the side surfaces of the flap 10 corresponding to the middle mold block 3 is set as a positioning stop surface to limit the upper bending portion 108 of the middle bow frame 103. By using the side surface of the flap 10 as the low-level bending portion 108 for positioning, the position of the middle bow frame 103 can be further limited.

[0049] This embodiment also provides a method for assembling a bow frame of a heat shield with a special-shaped surface, using the above-mentioned fixture, including the following steps:

[0050] Step S1: The rivet holes on the heat shield 101 are not processed yet, and bottom holes with a diameter of 1.5 mm are first processed at the rivet hole positions on the end brackets 102 and the middle brackets 103;

[0051] Step S2: Install the heat shield 101 on the fixture and support it with the end blocks 2 and the middle blocks 3 so that the end of the heat shield 101 abuts against the stop block 5. Insert the positioning pin 12 into a through hole 107 of the heat shield 101 for positioning, and tighten the locking pin 13.

[0052] Step S3: Assemble the end frame 102 and the middle frame 103 in sequence, insert the end of the positioning rod 4 into the frame positioning hole 104 of the end frame 102 to fix the end frame 102; flip the flap 10 and clamp it to the frame notch 105 of the middle frame 103 using the transverse column 6; lock the flap 10 with the locking structure; tighten the clamping screw 11 to compress the end frame 102 and the middle frame 103;

[0053] Step S4: Position the bow frame using argon arc welding, with each bow frame staggered left and right, with 6 to 10 points positioned on one side; welding parameters are: welding current 20-30A, argon gas flow rate: 6-10L / min for the front side, 4-8L / min for the back side, and tungsten electrode diameter Φ2mm;

[0054] Step S5: Remove the parts and use a radial drill to drill the bottom hole of Φ1.5mm on the bow frame to the required size of rivet hole Φ2.7mm;

[0055] Step S6: After drilling, polish and remove the positioning welding points and burrs;

[0056] Step S7: Riveting is performed using a riveting machine.

[0057] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A method for assembling a bow frame for a special-shaped heat insulation screen, characterized in that: The bow frame includes end bow frames (102) arranged at both ends of the heat insulation screen (101), and a plurality of middle bow frames (103) arranged between the two end bow frames (102). Each end bow frame (102) is provided with a bow frame positioning hole (104), each middle bow frame (103) is provided with a bending portion (108), and a bow frame notch (105) is formed between the two bending portions (108). A row of through holes (107) is provided on the heat insulation screen (101); the fixture used includes: A base (1); end mold blocks (2) arranged on the base (1) near both ends; and a plurality of middle mold blocks (3) arranged on the base (1); the positions of the end mold blocks (2) and the middle mold blocks (3) are consistent with the positions of the assembly bow, and the top mold surface is consistent with the inner mold surface of the heat insulation screen (101); A stopper (5) is provided on the outer surface of one of the end blocks (2), and a positioning pin (12) is provided on the bottom surface of the end block (2); an end support (8) is provided at the outer position of the end block (2), and the end support (8) is fixed on the base (1); a positioning rod (4) is provided on the end support (8), and the end of the positioning rod (4) is used to be inserted into the frame positioning hole (104) of the end frame (102) and fix the end frame (102); a tightening pin (13) is provided on the end support (8) away from the stopper (5); Side supports (9) are respectively provided at both ends of the end mold block (2) and the middle mold block (3), and the side supports (9) are fixed on the base (1); a flap (10) is installed on the side support (9) via a rotating shaft, a locking structure is provided on the side support (9) for locking the flap (10), and a clamping screw (11) is provided on the flap (10) for clamping the bow frame; A transverse column (6) is provided on the end of the flap (10) at the corresponding position of the middle mold block (3) away from the rotating shaft, and the transverse column (6) is used to be clamped on the bow frame notch (105); The method comprises the following steps: Step S1: The rivet holes on the heat shield (101) are not processed first, and bottom holes are first processed at the rivet hole positions on the end brackets (102) and the middle brackets (103); Step S2: The heat shield (101) is mounted on the fixture and supported by the end mold block (2) and the middle mold block (3) so that the end of the heat shield (101) abuts against the stop block (5), a positioning pin (12) is inserted into a through hole (107) of the heat shield (101), and the tightening pin (13) is tightened; Step S3: assemble the end frame (102) and the middle frame (103) in sequence, insert the end of the positioning rod (4) into the frame positioning hole (104) of the end frame (102) and fix the end frame (102); turn over the flap (10), and clamp it on the frame notch (105) of the middle frame (103) using the transverse column (6); lock the flap (10) with a locking structure; tighten the clamping screw (11) to compress the end frame (102) and the middle frame (103); Step S4: Using argon arc welding to position the bow frame, each bow frame is staggered left and right, and 6 to 10 points are positioned on one side; Step S5: Remove the parts and use a radial drill to drill the bottom hole on the bow frame to the required size of the rivet hole; Step S6: After drilling, polish and remove the positioning welding points and burrs; Step S7: Riveting is performed using a riveting machine.

2. The method for assembling a bow frame of a heat shield with a special-shaped surface according to claim 1, characterized in that: The locking structure includes a locking beam (15) and a waist-shaped groove (7) on the flap (10). The locking beam (15) is connected to the side support (9) through a screw rod, and the screw rod is inserted into the waist-shaped groove (7).

3. The method for assembling a profiled heat shield with a bow as claimed in claim 2, characterized in that: When the locking beam (15) is parallel to the waist-shaped groove (7), and the flap (10) rotates around the rotation axis, the locking beam (15) can pass through the waist-shaped groove (7).

4. The method for assembling a bow frame of a heat shield with a special-shaped surface according to claim 1, characterized in that: Hanging rings (14) are provided at the four corners of the base (1); and a handle bar (16) is provided at the head of the clamping screw (11).

5. The method for assembling a bow frame of a special-shaped heat insulation screen according to claim 1, characterized in that: A sliding portion (401) is provided on the positioning rod (4), and the sliding portion (401) is slidably matched with the end support (8). A longitudinal groove (402) is provided on the sliding portion (401); a set screw (403) is provided on the end support (8), and when the set screw (403) is tightened, the set screw (403) abuts against the longitudinal groove (402).

6. The method for assembling a bow frame of a heat shield with a special-shaped surface according to claim 5, characterized in that: A tangent plane (407) is provided on the cylindrical surface of the positioning rod (4) outside the end support (8), and the tangent plane (407) is in the same angular direction as the longitudinal groove (402).

7. The method for assembling a bow frame of a heat shield with a special-shaped surface according to claim 1, characterized in that: An insertion portion (404) and a screw portion (405) are provided at one end of the positioning rod (4); the insertion portion (404) is used to be inserted into the frame positioning hole (104) of the end frame (102); the diameter of the insertion portion (404) is smaller than the rod body of the positioning rod (4) to form a limiting step; a locking nut is provided on the screw portion (405) for locking the end frame (102).

8. The method for assembling a bow frame of a heat shield with a special-shaped surface according to claim 1, characterized in that: A limited stop ring (406) is provided on the positioning rod (4), and a hanging hole (408) is provided on the positioning rod (4).

9. The method for assembling a bow frame of a heat shield with a special-shaped surface according to claim 1, characterized in that: The flatness of the upper stop surface of the stop block (5) is 0.02-0.06; one side surface of the flap (10) corresponding to the middle block (3) is set as a positioning stop surface to limit the upper bending portion (108) of the middle bow frame (103).

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