Positioning welding clamp and method for circular mounting seat with lace

Abstract

The invention discloses a positioned welding clamp and method for a round mounting seat with laces, the positioned welding clamp comprises a positioning frame, a positioning block, a pressing plate, a nut and a cylindrical pin, the positioning frame is detachably connected with two reinforcing ribs on the two sides of the round mounting seat on an outer culvert 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 bulge for locking the mounting seat; the pressing plate and the positioning block are assembled on the same bolt, the pressing plate comprises a mounting seat lace positioning block and a second angular positioning hole, and a placing space for the circular mounting seat is formed between the pressing plate and the positioning block; the number of the nuts is two, one of the nuts is matched with the external thread on the surface of the protrusion for locking the mounting base, the other nut is matched with the bolt, and the pressing plate, the circular mounting base and the positioning block are located between the two nuts; and the cylindrical pin is inserted into the first angular positioning hole and the second angular positioning hole. The problem that the edge distance between a threaded bottom hole of a mounting base and a lace is not uniform due to radial deflection of the lace, low positioning welding efficiency and lace deflection is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of welding, and particularly relates to a positioning welding clamp and method for a circular mounting seat with lace. BACKGROUND

[0002] As Figure 1 is a schematic diagram of an aero-engine outer casing, the outer casing belongs to a titanium alloy thin-walled cylinder welding assembly, is an important load-bearing component for connecting various components and forming an air flow channel, generating thrust and transmitting load. There are seven circular mounting seat welds with lace on the outer casing, the weld shapes are all space saddle-shaped welds, there are reinforcing ribs on the upper and lower sides of the welds (the part diameter is greater than 700 mm, and the height is greater than 800 mm), and part of the mounting seat welds intersect with the horizontal reinforcing rib welds.

[0003] As Figure 7 is shown, the circular mounting seat has six laces at equal central angles in the circumferential direction of the end face, thread holes are processed between adjacent laces (a total of six), and the center position of the circular mounting seat is a center hole, Figure 7 the lower end outer contour of the E-E section is welded to the surface of the outer casing. When the circular mounting seat with lace is positioned, the lace angular direction of the mounting seat needs to be ensured to be consistent with Figure 1 the theoretical position, and the distance between the bottom hole and the laces on both sides needs to be ensured to be consistent when the outer casing is drilled with a thread bottom hole on the circular mounting seat. Since the part cylinder has poor rigidity, the thinnest wall thickness is only 0.65 mm, and the welding thickness is 1.2 mm, the part cylinder profile and the mounting seat profile cannot be used for positioning, and the mounting seat is close to the horizontal reinforcing rib of the cylinder. If a level gauge and other auxiliary calibration tools are used for lace angular direction calibration, only horizontal welding can be used, and the part size is large, so horizontal welding is mostly used during positioning welding. Therefore, when the circular mounting seat is positioned and welded by argon arc welding, the lace angular direction of the mounting seat needs to be repeatedly calibrated to prevent rotation, so that the distance between the thread bottom hole and the lace of the mounting seat is not uniform. SUMMARY

[0004] The application aims to provide a positioning welding clamp and method for a circular mounting seat with lace, realize welding positioning of the circular mounting seat with lace on a thin-walled outer casing with reinforcing ribs, prevent the lace angular direction of the circular mounting seat from deflecting during positioning welding, and solve the problems of low positioning welding efficiency of the circular mounting seat with lace and uneven distance between the thread bottom hole and the lace caused by lace deflection.

[0005] To achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0006] A positioning welding clamp for a circular mounting seat with lace, comprising:

[0007] A positioning frame is detachably connected to two reinforcing ribs distributed on both sides of the circular mounting seat with a border on the outer casing, and a first interval is left between the positioning frame and the outer casing, and a first angular positioning hole is formed on the positioning frame;

[0008] A positioning block is placed in the first interval, and the positioning block is connected to the positioning frame by a bolt, and the surface of the positioning block facing the positioning frame comprises a mounting seat supporting surface and a mounting seat locking protrusion, and the surface of the mounting seat locking protrusion has external threads;

[0009] A pressing plate is placed in the first interval and is assembled on the same bolt as the positioning block, and the surface of the pressing plate facing the positioning block comprises a mounting seat border positioning block, a second angular positioning hole penetrating the pressing plate, and a through hole corresponding to the mounting seat locking protrusion, and the pressing plate and the positioning block form a mounting space for the circular mounting seat with a border;

[0010] Two nuts are provided, one of which cooperates with the external threads on the surface of the mounting seat locking protrusion, and the other cooperates with the bolt, and the pressing plate, the circular mounting seat with a border and the positioning block are located between the two nuts;

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

[0012] As an option, the cross section of the positioning frame is in the shape of a door, comprising a long side across the circular mounting seat with a border and short sides at both ends of the long side connected to the reinforcing ribs, and the short sides are connected to the reinforcing ribs by bolts.

[0013] As an option:

[0014] The mounting seat supporting surface is an annular surface of the positioning block;

[0015] The mounting seat locking protrusion is a cylindrical body located in the inner ring of the mounting seat supporting surface, and the inner and outer diameters of the cylindrical body are smaller than the central hole of the circular mounting seat with a border, and the height of the cylindrical body is greater than the maximum thickness of the circular mounting seat with a border, and the surface of the cylindrical body has external threads.

[0016] As an option, the surface of the pressing plate facing the positioning block further comprises a positioning groove;

[0017] The surface of the positioning block facing the pressing plate has a positioning protrusion 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 an option, the mounting seat border positioning block on the surface of the pressing plate has two, and the positions of the two mounting seat border positioning blocks correspond to the positions of the two borders at both ends of the same radial line on the circular mounting seat with a border.

[0019] A method for tack welding a circular mounting seat with lace, wherein the circular mounting seat with lace is distributed on the circumferential surface of an outer casing, and the tack welding method comprises:

[0020] Taking the connecting line of two reinforcing ribs distributed on the circumferential surface of the outer casing and located on both sides of the circular mounting seat with lace as a reference, and the connecting line is parallel to the axial direction of the outer casing, an angular locating pin is set perpendicular to the connecting line and parallel to the radial direction of the outer casing. After the angular position of the circular mounting seat with lace is determined and limited by the angular locating pin, the circular mounting seat with lace is position-welded in a flat welding manner with the axial direction of the outer casing perpendicular to the horizontal direction.

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

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

[0023] Step 2: Place the lower end face of the circular mounting seat with lace (the end face corresponding to the outer casing surface) on the mounting seat support surface of the positioning block and make the mounting seat locking protrusion pass through the center hole of the circular mounting seat with lace. Install the pressure plate on the upper end face of the circular mounting seat with lace. On the one hand, ensure that the mounting seat locking protrusion passes through the through hole on the pressure plate. On the other hand, ensure that the mounting seat lace positioning block is embedded in the lace of the circular mounting seat with lace. Then take a nut and screw it into the external thread of the mounting seat locking protrusion to lock the pressure plate, the circular mounting seat with lace and the positioning block into one.

[0024] Step 3: Install the locked pressure plate, the circular mounting seat with lace, and the positioning block onto the bolts on the positioning frame. Then screw another nut into the bolt. Take a cylindrical pin and insert it into the first angular positioning hole and the second angular positioning hole at the same time.

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

[0026] Step 5: Adjust the two nuts and cylindrical pins on the bolt to adjust the welding gap and misalignment between the circular mounting base with lace and the outer casing. Start positioning welding after meeting the welding process requirements.

[0027] As an option, before step 1, the circular mounting seats with lace are grouped according to their distribution on the circumferential surface of the outer casing, and the same positioning frame is used to perform positioning welding on multiple circular mounting seats with lace distributed between two reinforcing ribs and located in the same axial section.

[0028] Compared with the prior art, the use of the positioning fixture of the present invention can solve the problem of positioning welding of the circular mounting seat 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 seat with lace, prevent the lace of the mounting seat from deflecting and affecting the processing of the threaded bottom hole of the mounting seat, and at the same time improve the efficiency of positioning welding of the circular mounting seat with lace. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the upper and lower halves of the outer casing;

[0030] Figure 2 This is the assembly drawing of the tack welding fixture;

[0031] Figure 3 for Figure 2 Middle AA cross-section;

[0032] Figure 4 for Figure 2 Middle BB cross-section;

[0033] Figure 5 for Figure 2 Middle CC cross-section;

[0034] Figure 6 This is the drawing of the pressure plate parts;

[0035] Figure 7 A schematic diagram of a circular mount with lace;

[0036] Figure 8 A three-dimensional diagram of the assembly of the tack welding fixture and the outer casing (cylindrical pins are not shown in the figure);

[0037] In the figure: 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. I-type 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 seat with lace, 24. second circular mounting seat with lace, 25. third circular mounting seat with lace, 26. fourth circular mounting seat with lace, 27. fifth circular mounting seat with lace. DETAILED DESCRIPTION

[0038] The application will be further described in conjunction with specific embodiments, but should not be understood as limiting the scope of the subject matter of the application to the following embodiments. Any modifications, replacements and changes made according to ordinary technical knowledge and common practice in the art without departing from the technical idea of the application are included in the scope of the application.

[0039] In the application, the positioning welding fixture calibrates the angular direction of the circular mounting seat with lace by the positional relationship between the lace shape of the circular mounting seat with lace and the horizontal reinforcing ribs on the outer containment casing (the reinforcing ribs are located in the horizontal plane perpendicular to the axis of the outer containment casing).

[0040] As shown in Figures 2 to 6 and Figure 8 , three types of positioning welding fixtures for the first circular mounting seat with lace 23, the second circular mounting seat with lace 24, the third circular mounting seat with lace 25, the fourth circular mounting seat with lace 26 and the fifth circular mounting seat with lace 27 on the outer containment casing in Figure 1 are designed in the embodiment, specifically including: the first positioning frame 1, the first positioning block 2 and the first pressing plate 3 are of one type, the second positioning frame 4, the second positioning block 5, the second pressing plate 6, the third positioning block 7 and the third pressing plate 8 are of the second type, the third positioning frame 9, the fourth positioning block 10, the fourth pressing plate 11, the fifth positioning block 12 and the fifth pressing plate 13 are of the third type, and are assembled with the I-shaped hexagonal nut 14, the first hexagonal head bolt 15, the hexagonal thin nut 16, the second hexagonal head bolt 17, the flat washer 18 and the cylindrical pin 19.

[0041] Among them:

[0042] The first positioning frame 1 (only one first angular positioning hole and one first hexagonal head bolt mounting hole), the second positioning frame 4 (two first angular positioning holes and two first hexagonal head bolt mounting holes) and the third positioning frame 9 (two first angular positioning holes and two first hexagonal head bolt mounting holes) fix the positioning welding fixture to the reinforcing ribs on the outer containment casing, the first positioning frame 1, the second positioning frame 4 and the third positioning frame 9 all adopt a door-shaped cross section, including a long side parallel to the axis of the outer containment casing, each end of the long side has a short side for connecting with the reinforcing rib, and the space formed by the long side and the short side is used for mounting the positioning welding fixture and the circular mounting seat with lace; the two short sides of the first positioning frame 1, the second positioning frame 4 and the third positioning frame 9 are mounted on the reinforcing rib by the second hexagonal head bolt 17 and the flat washer 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 play the role of supporting and fixing the circular mounting seat with lace, and lift the circular mounting seat with lace from the surface of the circular mounting seat with lace corresponding to 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 seat locking protrusions, and the surface of the mounting seat locking protrusion has external threads, which can be used with the hexagonal thin nut 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 a first angular positioning hole and a through hole for installing a first hexagonal head bolt 15.

[0044] The first pressing plate 3, the second pressing plate 6, the third pressing plate 8, the fourth pressing plate 11 and the fifth pressing plate 13 play the role of fixing and pressing the lace on the circular mounting seat with lace. Figure 6 , using the two mounting seat lace positioning blocks on it to match the outer contour Figure 7 The lace contour of the circular mounting seat with lace is fitted to achieve positioning. On the other hand, the circular mounting seat with lace is clamped between the pressure plate and the positioning block by correspondingly cooperating with 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 are also provided with through holes for convenient assembly on 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 are also provided with second angular positioning holes and positioning grooves (such as Figure 6 ), wherein the second angular positioning hole cooperates with the first angular positioning hole to determine the position of the cylindrical pin 19, and the positioning groove ensures the pressure plate and the positioning block (the positioning block is provided with a positioning protrusion, the positioning protrusion 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 cooperating with the outer contour of the positioning protrusion and the inner contour of the positioning groove. Figure 6 , the inner contour of the positioning groove is formed by two arcs and two parallel straight lines).

[0045] The cylindrical pin 19 plays the role of fixing the angular direction, and the cylindrical pin 19 is inserted into the second angular positioning hole and the first angular positioning hole at the same time.

[0046] The first hexagonal head bolt 15 is equipped with an I-type hexagonal nut 14, which is used to adjust the position of the circular mounting seat with lace relative to the outer casing, and further adjust the welding gap and misalignment during tack welding.

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

[0048] by Figure 4 Taking the BB cross-section view in the figure as an example, the tack welding method for the circular mounting seat with lace includes the following steps:

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

[0050] Step 2: Place the third circular mounting seat 25 with lace on the third positioning block 7, buckle the two mounting seat lace positioning blocks of the third pressing plate 8 into the lace of the third circular mounting seat 25 with lace, and tighten them with the hexagonal thin nut 16, so that the third circular mounting seat 25 with lace is pressed between the third pressing plate 8 and the third positioning block 7;

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

[0052] Step 4, repeat steps 2 and 3 to clamp the fourth circular mounting seat 26 with lace;

[0053] Step 5: Fix the second positioning frame 4 with the third circular mounting seat 25 with lace and the fourth circular mounting seat 26 with lace to the first reinforcing rib 20 and the second reinforcing rib 22 respectively using the second hexagonal head bolt 17 and the flat washer 18;

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

[0055] Step 7, repeat steps 1 to 6 to complete Figure 2 Positioning of the first lace circular mounting seat 23, the second lace circular mounting seat 24 and the fifth lace circular mounting seat 27 in the AA section view and the CC section view;

[0056] Step 8, using the flat welding method to assemble and position weld the first circular mounting seat with lace 23, the second circular mounting seat with lace 24, the third circular mounting seat with lace 25, the fourth circular mounting seat with lace 26 and the fifth circular mounting seat with lace 27.

[0057] The content not described in detail in the specification of the present application belongs to the prior art known to those skilled in the art. Although the above describes the specific embodiments of the present application in a descriptive manner, so that those skilled in the art can understand the present application, it should be clear that the present application is not limited to the scope of the specific embodiments, and for those skilled in the art, as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims, all the inventions utilizing the concept of the present application are included in the protection.

Claims

1. A tack-welding jig for positioning a circular mounting base with lace, characterized by, The positioning jig comprises: a positioning frame which is detachably connected to two reinforcing ribs distributed on both sides of the circular mounting seat with a border on the outer casing, and which leaves a first space between the positioning frame and the outer casing, and which has a first angular positioning hole on the positioning frame; a positioning block which is placed in the first space and which is connected to the positioning frame by a bolt, and which has a mounting seat supporting surface and a mounting seat locking protrusion on the surface of the positioning block facing the positioning frame, and which has external threads on the surface of the mounting seat locking protrusion; a pressing plate which is placed in the first space and which is assembled on the same bolt as the positioning block, and which has a mounting seat border positioning block, a second angular positioning hole penetrating the pressing plate, and a through hole corresponding to the mounting seat locking protrusion on the surface of the pressing plate facing the positioning block, and which forms a mounting space for the circular mounting seat with a border between the pressing plate and the positioning block; two nuts, one of which is matched with the external threads on the surface of the mounting seat locking protrusion, and the other of which is matched with the bolt, and the pressing plate, the circular mounting seat with a border, and the positioning block are located between the two nuts; a cylindrical pin which is inserted into the first angular positioning hole and the second angular positioning hole.

2. A tack-welding fixture for positioning a circular mounting base with lace, according to claim 1, characterized in that: The cross section of the positioning frame is in the shape of a door, which comprises a long side which crosses the circular mounting seat with a border, and short sides which are connected to the reinforcing ribs at both ends of the long side, and which are connected to the reinforcing ribs by bolts.

3. A tack-welding fixture for positioning a circular mounting base with lace, according to claim 1, characterized in that: The mounting seat supporting surface is an annular surface on the surface of the positioning block. The mounting seat locking protrusion is a cylindrical body which is located in the inner ring of the mounting seat supporting surface, and which has a smaller inner diameter and a larger height than the central hole of the circular mounting seat with a border, and which has external threads on the surface of the cylindrical body.

4. The tack-weld fixture for a circular mounting base with lace according to claim 1, characterized in that: The surface of the pressing plate facing the positioning block further comprises a positioning groove. The surface of the positioning block facing the pressing plate has a positioning protrusion which is matched with the positioning groove, and which is located between the mounting seat locking protrusion and the positioning block.

5. A tack-welding fixture for positioning a circular mounting base with lace, according to claim 1, characterized in that: The mounting seat border positioning block on the surface of the pressing plate has two, and the positions of the two mounting seat border positioning blocks correspond to the positions of the two borders at both ends of the same radial line on the circular mounting seat with a border.

6. A method of tack welding a laceworked circular mounting seat distributed on a circumferential surface of an outer canister, characterized in that, The positioning welding method comprises: a line connecting two reinforcing ribs which are distributed on the circumferential surface of the outer casing and which are located on both sides of the circular mounting seat with a border is taken as a reference, and the line is parallel to the axial direction of the outer casing, an angular positioning pin is arranged perpendicular to the line and parallel to the radial direction of the outer casing, and the angular positioning pin is used to determine and limit the angular position of the circular mounting seat with a border, and then the circular mounting seat with a border is positioned by flat welding in a manner that the axial direction of the outer casing is perpendicular to the horizontal direction.

7. A method of tack welding a circular mounting base with lace according to claim 6, characterized in that: The positioning jig of claim 1 is used, and the following steps are included: Step 1: installing a bolt on the positioning frame; Step 2: Place the lower end face of the circular mounting seat with lace on the mounting seat support surface of the positioning block and make the mounting seat locking protrusion pass through the center hole of the circular mounting seat with lace. Install the pressure plate on the upper end face of the circular mounting seat with lace. On the one hand, ensure that the mounting seat locking protrusion passes through the through hole on the pressure plate. On the other hand, ensure that the mounting seat lace positioning block is embedded in the lace of the circular mounting seat with lace. Then take a nut and screw it into the external thread of the mounting seat locking protrusion to lock the pressure plate, the circular mounting seat with lace and the positioning block into one. Step 3: Install the locked pressure plate, the circular mounting seat with lace, and the positioning block onto the bolts on the positioning frame. Then screw another nut into the bolt. Take a cylindrical pin and insert it into the first angular positioning hole and the second angular positioning hole at the same time. Step 4: Connect the two ends of the positioning frame to the two reinforcing ribs on both sides of the circular mounting base with lace; Step 5: Adjust the two nuts and cylindrical pins on the bolt to adjust the welding gap and misalignment between the circular mounting base with lace and the outer casing. Start positioning welding after meeting the welding process requirements.

8. A method of tack welding a circular mounting base with lace according to claim 7, characterized in that: Before step 1, the circular mounting seats with lace are grouped according to their distribution on the circumferential surface of the outer casing, and the same positioning frame is used to perform positioning welding on multiple circular mounting seats with lace distributed between two reinforcing ribs and located in the same axial section.

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