A tack-welding fixture and method for positioning a circular mounting base with lace

Abstract

The application discloses a positioning welding clamp and method for a circular mounting seat with lace, and the positioning welding clamp comprises a positioning frame, a positioning block, a pressing plate, nuts and a cylindrical pin, the positioning frame is detachably connected with two reinforcing ribs on both sides of a circular mounting seat on an outer containment casing, and a first angular positioning hole is formed in the positioning frame; the positioning block is connected with the positioning frame through a bolt and is provided with a protrusion for locking the mounting seat; the pressing plate is assembled with the positioning block on the same bolt, the pressing plate comprises a mounting seat lace positioning block and a second angular positioning hole, and a placing space of the circular mounting seat is formed between the pressing plate and the positioning block; the nuts are two, one of the nuts is matched with external threads on the surface of the protrusion for locking the mounting seat, and the other nut is matched with the bolt, and the pressing plate, the circular mounting seat and the positioning block are arranged between the two nuts; and the cylindrical pin is inserted into the first angular positioning hole and the second angular positioning hole. The application solves the problems of angular deflection of the lace, low positioning welding efficiency and uneven distance between a thread bottom hole of the mounting seat and the lace caused by deflection of the lace.

Description

Technical Field

[0001] This invention belongs to the field of welding technology, specifically relating to a positioning welding fixture and method for a circular mounting base with decorative trim. Background Technology

[0002] like Figure 1 This is a schematic diagram of the outer bypass casing of an aero-engine. The outer bypass casing is a thin-walled cylindrical welded assembly made of titanium alloy. It is a crucial load-bearing component that connects various parts, forms an airflow channel, generates thrust, and transmits loads. The outer bypass casing has seven circular mounting seat welds with decorative edges. All welds are spatial saddle-shaped welds, with reinforcing ribs on the upper and lower sides (parts with a diameter greater than 700mm and a height greater than 800mm). Some mounting seat welds intersect with the horizontal reinforcing rib welds.

[0003] like Figure 7 The diagram shows the structure of a circular mounting base with decorative lace trim. The end face of the circular mounting base has six decorative lace trims evenly distributed at equal central angles. Threaded holes (a total of six) are machined between adjacent decorative trims. The center of the circular mounting base is a central hole. Figure 7 The lower outer contour of the EE section is welded to the surface of the outer casing. When tack welding the circular mounting base with decorative trim, ensure that the angular direction of the trim is aligned with... Figure 1 Theoretically, the positions must be consistent to ensure that the distance between the threaded bottom hole and the decorative edge on both sides of the outer casing is consistent when drilling the threaded bottom hole on the circular mounting base. Due to the poor rigidity of the part's cylinder, with a minimum wall thickness of only 0.65mm and a weld thickness of 1.2mm, it is impossible to position it by the profile of the part's cylinder and the profile of the mounting base. Furthermore, the mounting base is close to the horizontal reinforcing rib of the cylinder. If auxiliary calibration tools such as a level are used for angular calibration of the decorative edge, only horizontal welding can be used. However, the part is relatively large, and flat welding is mostly used for tack welding. Therefore, when argon arc welding the circular mounting base for tack welding, repeated calibration is required to ensure that the decorative edge of the mounting base does not rotate, so as to avoid uneven distance between the threaded bottom hole and the decorative edge on the mounting base. Summary of the Invention

[0004] This invention aims to provide a positioning welding fixture and method for a circular mounting base with lace trim, enabling the welding positioning of the circular mounting base with lace trim on a thin-walled outer casing with reinforcing ribs, preventing the lace trim angle from deflecting during positioning welding, and solving the problems of low positioning welding efficiency and uneven distance between the mounting base thread bottom hole and the lace trim edge caused by lace trim deflection.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A positioning welding fixture for a circular mounting base with decorative trim, comprising:

[0007] The positioning frame spans the circular mounting base with lace trim on the outer duct casing and is detachably connected to two reinforcing ribs distributed on both sides of the circular mounting base with lace trim. A first gap is left between the positioning frame and the outer duct casing, and a first angular positioning hole is opened on the positioning frame.

[0008] The positioning block is placed in the first interval and is connected to the positioning frame by bolts. The surface of the positioning block facing the positioning frame includes a mounting base support surface and a mounting base locking protrusion. The surface of the mounting base locking protrusion has external threads.

[0009] The pressure plate is placed in the first interval and is assembled on the same bolt as the positioning block. The surface of the pressure plate facing the positioning block includes a mounting base lace positioning block, a second angular positioning hole penetrating the pressure plate, and a through hole for locking the corresponding mounting base protrusion. A placement space for a circular mounting base with lace is formed between the pressure plate and the positioning block.

[0010] Nuts, there are two nuts, one of which engages with the external thread of the raised surface of the mounting base for locking, and the other engages with the bolt. A pressure plate, a circular mounting base with lace trim, and a positioning block are located between the two nuts.

[0011] A cylindrical pin, which is inserted into a first angular positioning hole and a second angular positioning hole.

[0012] As one embodiment, the positioning frame has a gate-shaped cross-section, including a long side that spans a circular mounting base with a decorative edge and short sides that are connected to reinforcing ribs at both ends of the long side, with the short sides connected to the reinforcing ribs by bolts.

[0013] As one solution:

[0014] The mounting base support surface is an annular surface of the positioning block surface;

[0015] The mounting base locking protrusion is a cylinder located in the inner ring of the mounting base support surface, with an outer diameter smaller than the center hole of the circular mounting base with lace trim, and the height of the cylinder is greater than the maximum thickness of the circular mounting base with lace trim. The surface of the cylinder has external threads.

[0016] As one option, the surface of the pressure plate facing the positioning block also includes a positioning groove;

[0017] The positioning block has a positioning protrusion on the surface facing the pressure plate, which forms a positioning fit with the positioning groove, and the positioning protrusion is located between the mounting seat locking protrusion and the positioning block.

[0018] As one option, the mounting base lace positioning blocks on the surface of the pressure plate are two in number, and the positions of the two mounting base lace positioning blocks correspond to the positions of the two lace edges at both ends of the same radial line on the circular mounting base with lace.

[0019] A method for tack welding of a circular mounting base with decorative trim, wherein the circular mounting bases with decorative trim are distributed on the circumferential surface of the outer bypass casing, and the tack welding method includes:

[0020] Using the line connecting two reinforcing ribs distributed on the circumferential surface of the outer duct casing and located on both sides of the circular mounting base with lace trim as a reference, and with the line parallel to the axial direction of the outer duct casing, an angular locating pin is set perpendicular to the line and parallel to the radial direction of the outer duct casing. The angular position of the circular mounting base with lace trim is determined and restricted by the angular locating pin, and then the circular mounting base with lace trim is tack welded by a flat welding method with the axial direction of the outer duct casing perpendicular to the horizontal direction.

[0021] Furthermore, the aforementioned method for locating and welding the circular mounting base with lace trim uses the aforementioned locating and welding fixture and includes the following steps:

[0022] Step 1: Install bolts on the positioning bracket;

[0023] Step 2: Place the lower end face of the lace-trimmed circular mounting base (the side facing the outer casing surface) on the mounting base support surface of the positioning block, ensuring that the mounting base locking protrusion passes through the center hole of the lace-trimmed circular mounting base. Install the pressure plate on the upper end face of the lace-trimmed circular mounting base, ensuring that the mounting base locking protrusion passes through the through hole on the pressure plate and that the mounting base lace-trimmed positioning block is embedded in the lace of the lace-trimmed circular mounting base. Then, take a nut and screw it into the external thread of the mounting base locking protrusion to lock the pressure plate, the lace-trimmed circular mounting base, and the positioning block into one unit.

[0024] Step 3: Insert the locked pressure plate, the round mounting base with lace trim, and the positioning block into the bolt on the positioning frame, then screw another nut into the bolt, and insert a cylindrical pin into the first angular positioning hole and the second angular positioning hole simultaneously.

[0025] Step 4: Connect both ends of the positioning bracket to the two reinforcing ribs on both sides of the round mounting base with lace trim;

[0026] Step 5: Adjust the two nuts and cylindrical pins on the bolt to adjust the welding gap and misalignment between the lace-trimmed circular mounting base and the outer casing. Once the welding process requirements are met, begin tack welding.

[0027] As an alternative, prior to step 1, the circular mounting bases with lace trim are grouped according to their distribution on the circumferential surface of the outer casing. For multiple circular mounting bases with lace trim that are distributed between two reinforcing ribs and located in the same axial section, the same positioning frame is used for positioning welding.

[0028] Compared with the prior art, the positioning fixture of the present invention can solve the problem of positioning welding of the circular mounting base with lace on the outer casing. The positioning fixture and positioning welding method of the present invention facilitate the calibration of the angular position of the circular mounting base with lace, prevent the lace of the mounting base from deflecting and affecting the machining of the threaded bottom hole of the mounting base, and at the same time improve the positioning welding efficiency of the circular mounting base with lace. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the upper / lower half of the outer bypass casing;

[0030] Figure 2 Assembly drawing for locating welding fixture;

[0031] Figure 3 for Figure 2 AA section diagram;

[0032] Figure 4 for Figure 2 Middle BB section view;

[0033] Figure 5 for Figure 2 C-section view;

[0034] Figure 6 Drawing of the pressure plate component;

[0035] Figure 7 A schematic diagram of a circular mounting base with lace trim;

[0036] Figure 8 A 3D view of the assembly of the locating welding fixture and the outer casing (cylindrical pins are not shown in the figure);

[0037] In the diagram: 1. First positioning frame, 2. First positioning block, 3. First pressure plate, 4. Second positioning frame, 5. Second positioning block, 6. Second pressure plate, 7. Third positioning block, 8. Third pressure plate, 9. Third positioning frame, 10. Fourth positioning block, 11. Fourth pressure plate, 12. Fifth positioning block, 13. Fifth pressure plate, 14. Type I hexagonal nut, 15. First hexagonal head bolt, 16. Hexagonal thin nut, 17. Second hexagonal head bolt, 18. Flat washer, 19. Cylindrical pin, 20. First horizontal reinforcing rib, 21. Second horizontal reinforcing rib, 22. Third horizontal reinforcing rib, 23. First circular mounting base with lace trim, 24. Second circular mounting base with lace trim, 25. Third circular mounting base with lace trim, 26. Fourth circular mounting base with lace trim, 27. Fifth circular mounting base with lace trim. Detailed Implementation

[0038] The present invention will be further described below with reference to specific embodiments, but it should not be construed as limiting the scope of the subject matter of the present invention to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0039] In this invention, the positioning welding fixture uses the lace-shaped circular mounting base and the positional relationship between the lace shape and the multiple horizontal reinforcing ribs on the outer casing (the reinforcing ribs are located in a horizontal plane perpendicular to the axis of the outer casing) to calibrate the angular orientation of the lace-shaped circular mounting base.

[0040] like Figures 2-6 as well as Figure 8 As shown, for Figure 1 The first circular mounting base 23, the second circular mounting base 24, the third circular mounting base 25, the fourth circular mounting base 26, and the fifth circular mounting base 27 with lace trim are distributed at different positions on the inner and outer casings. In this embodiment, three specifications of positioning welding fixtures for the circular mounting bases with lace trim are designed. Specifically, the first positioning frame 1, the first positioning block 2, and the first pressure plate 3 are of one specification; the second positioning frame 4, the second positioning block 5, the second pressure plate 6, the third positioning block 7, and the third pressure plate 8 are of a second specification; and the third positioning frame 9, the fourth positioning block 10, the fourth pressure plate 11, the fifth positioning block 12, and the fifth pressure plate 13 are of a third specification. They are assembled with type I hexagonal nuts 14, first hexagonal head bolts 15, hexagonal thin nuts 16, second hexagonal head bolts 17, flat washers 18, and cylindrical pins 19.

[0041] in:

[0042] The first positioning frame 1 (with only one first angular positioning hole and one first hexagonal head bolt mounting hole), the second positioning frame 4 (with two first angular positioning holes and two first hexagonal head bolt mounting holes), and the third positioning frame 9 (with two first angular positioning holes and two first hexagonal head bolt mounting holes) serve to fix the positioning welding fixture to the reinforcing rib on the outer duct casing. The first positioning frame 1, the second positioning frame 4, and the third positioning frame 9 all adopt a portal cross-section, including a long side parallel to the axial direction of the outer duct casing, and a short side at each end of the long side for connecting with the reinforcing rib. The space formed by the long side and the short side is used for the positioning welding fixture to be installed with the circular mounting base with a decorative edge. The two short sides of the first positioning frame 1, the second positioning frame 4, and the third positioning frame 9 are installed on the reinforcing rib using second hexagonal head bolts 17 and flat washers 18.

[0043] The first positioning block 2, the second positioning block 5, the third positioning block 7, the fourth positioning block 10, and the fifth positioning block 12 serve to support and fix the circular mounting base with lace trim. They lift the circular mounting base with lace trim from the surface of the side of the outer casing. The first positioning block 2, the second positioning block 5, the third positioning block 7, the fourth positioning block 10, and the fifth positioning block 12 have cylindrical mounting base locking protrusions. The surface of the mounting base locking protrusions has external threads, which can be used with hexagonal thin nuts 16 to press the pressure plate onto the positioning block. The first positioning block 2, the second positioning block 5, the third positioning block 7, the fourth positioning block 10, and the fifth positioning block 12 also have first angular positioning holes and through holes for installing first hexagonal head bolts 15.

[0044] The first pressure plate 3, the second pressure plate 6, the third pressure plate 8, the fourth pressure plate 11, and the fifth pressure plate 13 serve to fix and press the lace trim on the circular mounting base with the lace trim, such as... Figure 6 The two mounting bases on it are designed to fit the outline of the decorative positioning blocks. Figure 7 The circular mounting base with decorative trim is positioned by fitting its trim contour. On the other hand, it is clamped between the pressure plate and the positioning blocks by correspondingly engaging the first positioning block 2, the second positioning block 5, the third positioning block 7, the fourth positioning block 10, and the fifth positioning block 12. The first pressure plate 3, the second pressure plate 6, the third pressure plate 8, the fourth pressure plate 11, and the fifth pressure plate 13 also have through holes for easy assembly onto the first hexagonal head bolt 15. The first pressure plate 3, the second pressure plate 6, the third pressure plate 8, the fourth pressure plate 11, and the fifth pressure plate 13 also have second angular positioning holes and positioning grooves (such as...). Figure 6 The second angular positioning hole mates with the first angular positioning hole to determine the position of the cylindrical pin 19, while the positioning groove ensures the positioning of the pressure plate and the positioning block (the positioning block is provided with a positioning protrusion, which is located on the surface of the positioning block, and the mounting seat locking protrusion is located on the surface of the positioning protrusion, and the positioning is achieved by the outer contour of the positioning protrusion mates with the inner contour of the positioning groove). Figure 6 In the assembly position, the inner contour of the positioning groove is formed by two circular arcs and two parallel straight lines.

[0045] The cylindrical pin 19 serves to fix the angular direction, and the cylindrical pin 19 is inserted into both the second angular positioning hole and the first angular positioning hole.

[0046] The first hexagonal head bolt 15 is fitted with a type I hexagonal nut 14, which is used to adjust the position of the lace-trimmed circular mounting base relative to the outer casing, thereby adjusting the welding gap and misalignment during tack welding.

[0047] like Figure 2As shown, the first circular mounting base with lace trim 23, the second circular mounting base with lace trim 24, the third circular mounting base with lace trim 25, the fourth circular mounting base with lace trim 26, and the fifth circular mounting base with lace trim 27 are distributed at three different cross-sectional positions on the outer casing, including the AA section, the BB section, and the CC section. For the three cross-sections, the first positioning frame 1, the second positioning frame 4, and the third positioning frame 9 are used for positioning welding, respectively.

[0048] by Figure 4 Taking the BB section view as an example, the tack welding method for the circular mounting base with lace trim includes the following steps:

[0049] Step 1: Place the outer casing vertically (axis perpendicular to the horizontal plane) and screw the two first hexagonal head bolts 15 into the threaded holes (first hexagonal head bolt mounting holes) of the second positioning bracket 4;

[0050] Step 2: Place the third decorative circular mounting base 25 on the third positioning block 7, and fasten the two decorative positioning blocks of the mounting base 8 inside the decorative edge of the third decorative circular mounting base 25. Tighten with hexagonal thin nuts 16 to press the third decorative circular mounting base 25 between the third pressure plate 8 and the third positioning block 7.

[0051] Step 3: Pass the first hexagonal head bolt 15 through the third pressure plate 8 and the third positioning block 7, and fix it with an I-type hexagonal nut 14 on the first hexagonal head bolt 15 on one side of the third positioning block 7. Then insert the cylindrical pin 19 into the second angular positioning hole and the first angular positioning hole on the third pressure plate 8 and the second positioning frame 4.

[0052] Step 4, repeat steps 2-3 to clamp the fourth round mounting base 26 with lace trim;

[0053] Step 5: Fix the second positioning frame 4, which has the third round mounting base 25 with lace trim and the fourth round mounting base 26 with lace trim, to the first reinforcing rib 20 and the second reinforcing rib 22 respectively with the second hexagonal head bolt 17 and the flat washer 18.

[0054] Step 6: Adjust the type I hexagonal nut 14, hexagonal thin nut 16, and cylindrical pin 19 to ensure that the welding gap and misalignment between the third scalloped circular mounting base 25 and the fourth scalloped circular mounting base 26 and the outer casing body meet the welding process requirements. The clamping result is as follows: Figure 8 As shown;

[0055] Step 7: Repeat steps 1-6 to complete. Figure 2 Positioning of the first circular mounting base 23 with lace trim, the second circular mounting base 24 with lace trim, and the fifth circular mounting base 27 with lace trim in the AA section view and the CC section view;

[0056] Step 8: The first circular mounting base with decorative trim 23, the second circular mounting base with decorative trim 24, the third circular mounting base with decorative trim 25, the fourth circular mounting base with decorative trim 26 and the fifth circular mounting base with decorative trim 27 are assembled and positioned by flat welding.

[0057] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A method for locating and welding a circular mounting base with lace trim, wherein the circular mounting bases with lace trim are distributed on the circumferential surface of the outer casing, characterized in that, The tack welding fixtures used include: The positioning frame spans the circular mounting base with lace trim on the outer duct casing and is detachably connected to two reinforcing ribs distributed on both sides of the circular mounting base with lace trim. A first gap is left between the positioning frame and the outer duct casing, and a first angular positioning hole is opened on the positioning frame. The positioning block is placed in the first interval and is connected to the positioning frame by bolts. The surface of the positioning block facing the positioning frame includes a mounting base support surface and a mounting base locking protrusion. The surface of the mounting base locking protrusion has external threads. The pressure plate is placed in the first interval and is assembled on the same bolt as the positioning block. The surface of the pressure plate facing the positioning block includes a mounting base lace positioning block, a second angular positioning hole penetrating the pressure plate, and a through hole for locking the corresponding mounting base protrusion. A space for placing a circular mounting base with lace is formed between the pressure plate and the positioning block. Nuts, there are two nuts, one of which engages with the external thread of the raised surface of the mounting base for locking, and the other engages with the bolt. A pressure plate, a circular mounting base with lace trim, and a positioning block are located between the two nuts. A cylindrical pin, which is inserted into a first angular positioning hole and a second angular positioning hole; The mounting base support surface is an annular surface of the positioning block surface; The mounting base locking protrusion is a cylinder located in the inner ring of the mounting base support surface, with an outer diameter smaller than the center hole of the circular mounting base with lace trim, and the height of the cylinder is greater than the maximum thickness of the circular mounting base with lace trim. The surface of the cylinder has external threads. The surface of the pressure plate facing the positioning block also includes a positioning groove; The positioning block has a positioning protrusion on the surface facing the pressure plate that forms a positioning fit with the positioning groove, and the positioning protrusion is located between the mounting seat locking protrusion and the positioning block. Tack welding methods include: Using the line connecting two reinforcing ribs distributed on the circumferential surface of the outer duct casing and located on both sides of the circular mounting base with lace trim as a reference, and with this line parallel to the axial direction of the outer duct casing, an angular locating pin is set perpendicular to this line and parallel to the radial direction of the outer duct casing. The angular position of the circular mounting base with lace trim is then determined and restricted by this angular locating pin. Finally, the circular mounting base with lace trim is tack welded using a flat welding method perpendicular to the horizontal direction of the outer duct casing. The specific steps include: Step 1: Install bolts on the positioning bracket; Step 2: Place the lower end face of the lace-trimmed circular mounting base on the mounting base support surface of the positioning block, and ensure that the mounting base locking protrusion passes through the center hole of the lace-trimmed circular mounting base. Install the pressure plate on the upper end face of the lace-trimmed circular mounting base. On the one hand, ensure that the mounting base locking protrusion passes through the through hole on the pressure plate, and on the other hand, ensure that the mounting base lace-trimmed positioning block is embedded in the lace of the lace-trimmed circular mounting base. Then, take a nut and screw it into the external thread of the mounting base locking protrusion to lock the pressure plate, the lace-trimmed circular mounting base and the positioning block into one piece. Step 3: Insert the locked pressure plate, the round mounting base with lace trim, and the positioning block into the bolt on the positioning frame, then screw another nut into the bolt, and insert a cylindrical pin into the first angular positioning hole and the second angular positioning hole simultaneously. Step 4: Connect both ends of the positioning bracket to the two reinforcing ribs on both sides of the round mounting base with lace trim; Step 5: Adjust the two nuts and cylindrical pins on the bolt to adjust the welding gap and misalignment between the lace-trimmed circular mounting base and the outer casing. Once the welding process requirements are met, begin tack welding.

2. The positioning welding method for a circular mounting base with lace trim according to claim 1, characterized in that: Before step 1, the circular mounting seats with lace trim are grouped according to their distribution on the circumferential surface of the outer casing. For multiple circular mounting seats with lace trim that are distributed between two reinforcing ribs and located in the same axial section, the same positioning frame is used for positioning welding.

3. The positioning welding method for a circular mounting base with lace trim according to claim 1, characterized in that: The positioning frame has a gate-shaped cross-section, including a long side that spans a circular mounting base with a decorative edge and short sides that are connected to reinforcing ribs at both ends of the long side. The short sides are connected to the reinforcing ribs by bolts.

4. The positioning welding method for a circular mounting base with lace trim according to claim 1, characterized in that: There are two mounting bracket positioning blocks on the surface of the pressure plate. The positions of the two mounting bracket positioning blocks correspond to the positions of the two lace edges at both ends of the same radial line on the circular mounting bracket with lace.

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