Large curvature titanium alloy sawtooth belt plate assembly manufacturing fixture and method

Abstract

The present application belongs to the technical field of metal material machining, and specifically relates to a large-curvature titanium alloy sawtooth belt plate combined manufacturing clamp and method. The clamp is a split clamp, comprising a bottom plate, a right-end belt plate scribing block, a left-end belt plate scribing block, a right positioning pin, a left positioning pin and a drilling mechanism. The present application uses a set of split and restored multifunctional combined clamp to replace independent scribing clamps, assembly clamps, combined state scribing clamps and contour inspection clamps in the production process of sawtooth feature belt plate assembly assembly and welding, thereby avoiding multiple sets of manufacturing tooling according to part positioning transmission error and tooling manufacturing error. With the aid of the separable feature of the combined clamp at the weld position, the weld joint assembly precision can be further improved, and the repair coordination difficulty can be reduced. Finally, high-precision combined manufacturing of large-curvature belt plates can be realized, the weld position has high contour precision and coordination precision, and the present application has strong application value for the combined assembly and machining of curved thin-walled sheet metal parts.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal material machining, and relates to a method for manufacturing a large-curvature titanium alloy serrated strip assembly, in particular to a fixture and method for manufacturing a large-curvature titanium alloy serrated strip assembly. Background Art

[0002] Titanium alloy materials are often used in the manufacture of aircraft structural parts. They have the advantages of high temperature resistance, corrosion resistance, and low specific gravity. Especially in the field of high-performance fighter jet manufacturing, the amount of titanium alloy parts and materials used can directly reflect their level of advancement.

[0003] Titanium alloy parts in fighter aircraft structures are primarily concentrated in the rear fuselage. Typical sheet metal parts include skins, straps, mouth frames, bulkheads, and stringers. These are gradually assembled and connected through riveting and welding to form the aircraft's monocoque structure. Currently, titanium alloy sheet metal manufacturing is limited by the width of the raw material rolled sheet, making it impossible to process larger parts in one go. Welding is often required.

[0004] The thin-walled, serrated titanium alloy strip is located on the inner surface of the skin, adhered to the outer skin, and used to connect the segmented butt skins. Influenced by the curvature of the aircraft's exterior, the overall structure is semi-circular, with local reinforcement dimples evenly distributed. Because the local reinforcement dimples are all normal protrusions, the outermost reinforcement dimples at both ends have local closed-angle structures. Forming in one go is impossible with a single stamping direction, further requiring the highly curvatured strip to be manufactured through separate welding.

[0005] The problem of the reinforcement dimples being unable to be formed in one go when splitting a large curvature strip plate can be eliminated, and single-piece molding can be achieved using a conventional plate width. However, during the butt welding process, problems such as weld misalignment, difficulty in aligning offset reinforcement dimples, and significant cumulative deformation due to errors in transferring multiple tooling datums are common. Therefore, an efficient and high-precision combined manufacturing method is needed. Summary of the Invention

[0006] To overcome the aforementioned technical problems, the present invention provides a novel combined process method that utilizes a single, detachable, integrated fixture to achieve both single-item part manufacturing and the combined manufacturing of strip-plate assemblies. By simultaneously defining the outer contours of individual parts and assemblies, as well as the weld seam edges, on a single fixture, this method avoids errors in hole positioning and assembly coordination across multiple tooling components, ultimately enabling the precise assembly of high-curvature serrated strip-plate assemblies.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] The large curvature titanium alloy serrated strip assembly manufacturing fixture is a split fixture, including a base plate 1, a right end strip plate marking block 2, a left end strip plate marking block 3, a right positioning pin 4, a left positioning pin 5 and a drilling mechanism 6; the base plate 1 is provided with a plurality of pin through-holes, and the right end strip plate marking block 2 and the left end strip plate marking block 3 are respectively installed on the base plate 1 through the right positioning pin 4 and the left positioning pin 5; the large curvature titanium alloy serrated strip to be manufactured is divided into two pieces, the right end strip plate b and the left end strip plate a; the right end strip plate marking block 2 and the left end strip plate marking block 3 are respectively installed on the base plate 1 through the right positioning pin 4 and the left positioning pin 5 The upper surface profile is respectively the same as the profile of the right end strip plate b and the left end strip plate a; the right end strip plate marking block 2 and the left end strip plate marking block 3 are installed on the base plate 1 separately or simultaneously according to the requirements of the manufacturing process; when the right end strip plate marking block 2 and the left end strip plate marking block are installed on the base plate 1 at the same time, the inner edges of the right end strip plate marking block 2 and the left end strip plate marking block 3 contact each other, and the upper surface profile formed after alignment is the same as the profile of the complete strip plate, and the outline after combination is the same as the outline of the complete strip plate.

[0009] The outer end of the right end plate marking block 2 is provided with a drilling mechanism 6, and two drilling mechanisms 6 are provided on both sides of the inner end; the outer end of the left end plate marking block 3 is provided with a drilling mechanism 6, and two drilling mechanisms 6 are provided on both sides of the inner end.

[0010] The drilling mechanism 6 includes a base 6.1, a flip drill jig 6.2 and a pin 6.3; the base 6.1 is installed on the right-end plate-marking block 2 or the left-end plate-marking block 3; the flip drill jig 6.2 is installed on the base 6.1 by an axial plug-in method, so that the flip drill jig 6.2 rotates in the middle of the fork ear of the base 6.1 and is fixed by the pin 6.3.

[0011] The combined manufacturing method of large curvature titanium alloy serrated strip plate adopts the above-mentioned fixture, and the specific steps are as follows:

[0012] Step 1: Remove the right-side plate marking block 2 and the drilling mechanism 6 thereon from the base plate 1, and retain the left-side plate marking block 3 and the drilling mechanism 6 thereon, with the weld edge outline of the left-side plate marking block 3 exposed for marking;

[0013] Step 2: Take out the latch 6.3 of the drilling mechanism 6 on the left end strip plate marking block 3, rotate and open the flip drilling jig 6.2, at this time the upper surface of the left end strip plate marking block 3 is in an open state, place the formed left end strip plate a rough material on the left end strip plate marking block 3, and position it according to the corresponding reinforcement groove on the left end strip plate marking block 3, press the left end strip plate a rough material to make it fit and fix it on the upper surface of the left end strip plate marking block 3;

[0014] Step 3: Rotate the flip drill jig 6.2 on the left-end strip plate marking block 3 to the upper surface of the left-end strip plate a rough material, install the latch 6.3, fix it, and drill a hole with a drilling tool. Insert a positioning pin of corresponding diameter into the hole, fix the left-end strip plate a rough material, and mark the weld position line on the back of the left-end strip plate a rough material according to the welding edge contour of the left-end strip plate marking block 3. Remove the latch 6.3 again and rotate open the flip drill jig 6.2, and remove the marked left-end strip plate a rough material.

[0015] Step 4: Remove the left-end plate marking block 3 and the drilling mechanism 6 thereon from the base plate 1, and then install the right-end plate marking block 2 and the drilling mechanism 6 thereon on the base plate 1, with the weld edge outline of the right-end plate marking block 2 exposed for marking;

[0016] Step 5. Take out the latch 6.3 of the drilling mechanism 6 on the right-end strip plate marking block 2, rotate and open the flip drilling jig 6.2. At this time, the upper surface of the right-end strip plate marking block 2 is in an open state. Place the formed right-end strip plate b rough material on the right-end strip plate marking block 2, and position it according to the corresponding reinforcement groove on the left-end strip plate marking block 3. Press the right-end strip plate b rough material so that it fits and is fixed on the upper surface of the right-end strip plate marking block 2;

[0017] Step 6. Rotate the flip drill jig 6.2 on the right-end strip plate marking block 2 to the upper surface of the right-end strip plate b rough material, install the latch 6.3, fix it, and drill a hole with a drilling tool. Insert a positioning pin of corresponding diameter into the hole, fix the right-end strip plate b rough material, and mark the weld position line on the back of the right-end strip plate b rough material according to the welding edge contour of the right-end strip plate marking block 2. Remove the latch 6.3 again and rotate to open the flip drill jig 6.2, and remove the marked right-end strip plate b rough material.

[0018] Step 7: After marking, the left end strip a and the right end strip b are turned over, and the welding edge strips are laser cut according to the markings. The edge oxide layer is filed and removed. The surfaces of the strips are pickled to remove attached impurities and oil stains.

[0019] Step 8: Align the weld seams of the left-end strip a and the right-end strip b processed in step 7 and weld them together to form an integrated strip;

[0020] Step 9: Grind and polish the weld surface of the integrated strip blank until there is no protruding material on the weld, perform vacuum heat treatment annealing on the integrated strip blank, and correct welding deformation at the same time;

[0021] Step 10: Install and reset the right-end strip plate marking block 2 and the left-end strip plate marking block 3 at the same time, remove the latch 6.3, rotate and open the flip drill jig 6.2, and then fix the integrated strip plate rough material after heat treatment and correction on the upper surfaces of the right-end strip plate marking block 2 and the left-end strip plate marking block 3, and mark the integrated strip plate contour shape on the back of the strip plate according to the contour of the marking blocks;

[0022] Step 11: Turn over the scribed integral strip blank, laser cut the strip shape according to the scribed lines, and file the cut edges to remove burrs;

[0023] Step 12: Install the cut integrated strip again on the right strip marking block 2 and the left strip marking block 3, and use the corresponding reinforcement grooves on the surface for positioning. At this time, check the serrated profile of the strip to finally obtain a large curvature serrated strip.

[0024] The beneficial effects of the present invention are as follows: by using the process technology of the present invention, a set of separable, restorable multifunctional combined fixtures is used to replace independent marking fixtures, assembly fixtures, combined marking fixtures, and external contour inspection fixtures in the assembly and welding production process of serrated feature strip plate components, thereby avoiding the transmission errors of positioning of multiple sets of manufacturing tooling and tooling manufacturing errors. With the help of the separable feature of the combined fixture at the weld position, the accuracy of weld matching and assembly can be further improved, and the difficulty of repair and coordination can be reduced. Ultimately, high-precision combined manufacturing of large curvature strip plates can be achieved, and the accuracy and coordination accuracy of the weld position and the outer contour of the component are high, which has strong application value for the combined assembly processing of curved thin-walled sheet metal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of a large curvature titanium alloy serrated strip plate;

[0026] Figure 2 This is a schematic diagram of a large curvature zigzag strip plate in use on the manufacturing fixture of the present invention;

[0027] Figure 3 It is a schematic diagram of the detection state of the small end strip on the manufacturing fixture of the present invention;

[0028] Figure 4 It is a schematic diagram of the testing state of the large end strip on the manufacturing fixture of the present invention;

[0029] Figure 5 A schematic diagram of the assembled state of the manufacturing fixture of the invention;

[0030] Figure 6 Schematic diagram of the drilling mechanism on the invented manufacturing fixture.

[0031] In the figure: 1 bottom plate; 2 right end strip plate marking block; 3 left end strip plate marking block; 4 right positioning pin; 5 left positioning pin; 6 drilling mechanism; 6.1 base; 6.2 flip drilling jig; 6.3 pin; a left end strip plate; b right end strip plate. DETAILED DESCRIPTION

[0032] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and technical solutions.

[0033] like Figure 1 As shown, according to the requirements of actual processing conditions, the large curvature titanium alloy serrated strip plate to be manufactured is divided into two pieces: the right end strip plate b and the left end strip plate a.

[0034] like Figure 2 As shown, the large curvature titanium alloy serrated strip assembly manufacturing fixture of the present invention is a split fixture, including a base plate 1, a right end strip plate marking block 2, a left end strip plate marking block 3, a right positioning pin 4, a left positioning pin 5 and a drilling mechanism 6. The bottom plate 1 is used to support and carry other components of the upper fixture and the strip plate raw material; the right end strip plate marking block 2 is used to position and mark the right end strip plate b, and its profile is the same as the surface of the right end strip plate b, with 3 convex features, and the outer edge contour is the final strip plate shape contour. It is positioned with the bottom plate 1 through three right positioning pins 4 and is fixed by gravity; the left end strip plate marking block 3 is used to position and mark the left end strip plate a, and its profile is the same as the surface of the left end strip plate a, with 2 convex features, and the outer edge contour is the final strip plate shape contour. It is positioned with the bottom plate 1 through three left positioning pins 5 and is fixed by gravity; the right end strip plate marking block 2 and the left end strip plate marking block 3 are respectively CNC-machined into the bottom plane, welding mating surface and other profiles, and are placed flat on the bottom plate 1 by gravity. After being positioned with positioning pins, they are completely fitted and docked at the strip plate weld position to form a complete combined strip plate profile and profile.

[0035] The outer end of the right end plate marking block 2 is provided with a drilling mechanism 6, and two drilling mechanisms 6 are provided on both sides of the inner end; the outer end of the left end plate marking block 3 is provided with a drilling mechanism 6, and two drilling mechanisms 6 are provided on both sides of the inner end.

[0036] like Figure 6As shown, the drilling mechanism 6 is a universal module, including a base 6.1, a flip drill jig 6.2 and a latch 6.3; taking the right-end plate-belt marking block 2 as an example, the base 6.1 and the right-end plate-belt marking block 2 are connected by 2 pins and 2 screws, which can ensure positioning and tight installation. The flip drill jig 6.2 and the base 6.1 are axially plugged, so that the flip drill jig 6.2 can rotate in the middle of the fork ear of the base 6.1. When not in use, it is rotated to the outside of the marking block carcass without affecting the use of internal marking. When in use, it is flipped to the upper surface of the carcass and fixed with the latch 6.3 through the flip drill jig 6.2 and the fork ear holes of the base 6.1, that is, the axial position of the spatial positioning hole is finally obtained, and a pneumatic or electric drill can be used for drilling.

[0037] The right end strip b and the left end strip a are formed separately and then welded together to form a whole. The single strip is manufactured using a hot forming process and uses expanded raw materials with compensation allowances. When making the left end strip a, if Figure 3 As shown, the right end strip plate marking block 2 and the right positioning pin 4 are removed and only the left end strip plate marking block 3 is retained. After forming, the left end strip plate a is positioned by matching the two reinforcing dimples with the two convex features of the left end strip plate marking block 3, and then the drilling mechanism 6 on the left end strip plate marking block 3 is used to make three positioning holes and mark the position line of the welding edge; when making the right end strip plate b, as shown Figure 4 As shown, the left end strip plate marking block 3 and the left positioning pin 5 are removed and only the right end strip plate marking block 2 is retained. After forming, the strip plate b raw material is positioned by matching the three reinforcing recesses with the three convex features on the right end strip plate marking block 2, and then the drilling mechanism 6 on the right end strip plate marking block 2 is used to make three positioning holes and mark the position line of the welding edge; in this way, the same welding line can be obtained on the same set of fixtures.

[0038] The right-end strip b and the left-end strip a are cut at the welding edges using other special fixtures respectively, and positioning transfer is no longer required, and they can be cut directly according to the marking. Since the same set of marking fixtures are used, the coordination accuracy between the right-end strip b and the left-end strip a is greatly improved, avoiding the accumulation of tooling manufacturing errors caused by independent marking, and reducing the difficulty of welding combination repair.

[0039] After the single-sided strip is formed, it is positioned on the marking block using the convex hull feature, and positioning holes are made using three drilling mechanisms. This can be used for positioning and coordination during rough cutting of the edge allowance, as well as positioning and coordination on the butt welding fixture after the welding edge is cut according to the marking. This can achieve a batch production mode of one-time positioning and welding during welding, with high precision and efficiency.

[0040] like Figure 5As shown, after the right-end strip marking block 2 and the left-end strip marking block 3 are positioned and assembled at the same time, their edge contours constitute the overall sawtooth outer contour of the strip, which can realize the overall marking after the strip is welded, and use the positioning holes to accurately cut the sawtooth shape, and the position accuracy of the weld position relative to the outer contour of the component is relatively high, so it is easier to ensure the positioning accuracy.

[0041] The specific steps of the combined manufacturing method of the large curvature titanium alloy serrated strip plate using the above-mentioned fixture are as follows:

[0042] Step 1: Figure 3 As shown, the right positioning pin 4 is removed, and the right end plate marking block 2 together with the drilling mechanism 6 thereon is removed from the base plate 1, leaving only the left end plate marking block 3 and the left positioning pin 5, with the welded edge contour exposed and available for marking;

[0043] Step 2: Figure 3 As shown, remove the latch 6.3, rotate and open the flip jig 6.2, and the upper surface of the left end strip plate marking block 3 is in an open state. At this time, place the formed left end strip plate a on the upper molded surface of the marking block 3, and position it according to the two internal reinforcement grooves, and press the entire part to fit and fix it;

[0044] Step 3: Rotate the flip drill jig 6.2 to the upper surface of the left end strip a rough material and install the latch 6.3. After fixing it, use the drilling tool to drill three positioning holes in sequence, insert the positioning pins of corresponding diameters, fix the left end strip a rough material and mark the weld position line on the back of the left end strip a rough material according to the welding edge contour of the left end strip marking block 3. Remove the latch 6.3 again and rotate to open the flip drill jig 6.2, and remove the left end strip a rough material;

[0045] Step 4: Figure 4 As shown, the left positioning pin 5 is removed, and the left end plate marking block 3 together with the drilling mechanism 6 thereon is removed from the base plate 1, leaving only the right end plate marking block 2, with its weld edge outline exposed and available for marking;

[0046] Step 5: Figure 4 As shown, remove the latch 6.3, rotate and open the flip jig 6.2, and the upper surface of the right end plate marking block 2 is in an open state. At this time, place the formed right end plate b rough material on the upper molded surface of the right end plate marking block, position it according to the three internal reinforcement grooves, and press the entire part to fit and fix it;

[0047] Step 6. Rotate the flip drill jig 6.2 to the upper surface of the right-end strip plate b rough material and install the latch 6.3. After fixing it, use the drilling tool to drill holes in sequence, drill three positioning holes, insert the positioning pins of corresponding diameters, fix the rough material and mark the weld position line on the back of the right-end strip plate b rough material according to the welding edge contour of the right-end strip plate marking block 2. Remove the latch 6.3 again and rotate to open the flip drill jig 6.2, and remove the right-end strip plate b rough material;

[0048] Step 7: Turn over the right-end strip b and the left-end strip a, respectively use a universal clamping fixture to laser cut the welding edge strips according to the marking line, file and remove the edge oxide layer, and perform surface pickling treatment on the strips to remove attached impurities, oil stains, etc.

[0049] Step 8: Use a special welding fixture to position the strip a and strip b according to the three positioning holes, align the welds and weld them together to connect the right end strip b rough material and the left end strip a rough material into an integrated structure;

[0050] Step 9: After welding, grind and polish the weld surface until there is no protruding material on the weld. Perform vacuum heat treatment annealing on the assembled whole strip plate, clamp it with a heat treatment fixture, and position it with 6 locating pins. At the same time, correct the welding deformation.

[0051] Step 10: Figure 5 As shown, the right-end strip plate marking block 2 and the left-end strip plate marking block 3 are simultaneously installed and reset to form a whole. The latch 6.3 is removed, and the flip drill jig 6.2 is rotated to open. Then, the heat-treated and corrected whole strip plate is positioned on the upper surface of the fixture according to the 6 positioning pins and fixed. The overall strip plate contour is marked on the back of the strip plate according to the contour of the marking blocks.

[0052] Step 11: Turn over the integrated strip sheet, use a cutting fixture to laser cut the component shape according to the marking line, and file the cut edge to remove burrs;

[0053] Step 12: Figure 2 As shown, the cut integral composite strip is mounted on the fixture again and positioned using five reinforced recessed surfaces. At this time, the serrated profile of the strip is inspected, and a large curvature serrated strip is finally obtained.

Claims

1. A method for manufacturing a large curvature titanium alloy serrated strip assembly, characterized in that: The large curvature titanium alloy serrated strip assembly manufacturing method is realized by using a large curvature titanium alloy serrated strip assembly manufacturing fixture. The large curvature titanium alloy serrated strip assembly manufacturing fixture is a split fixture, including a base plate (1), a right end strip plate marking block (2), a left end strip plate marking block (3), a right positioning pin (4), a left positioning pin (5) and a drilling mechanism (6); the base plate (1) is provided with a plurality of pin through-holes, and the right end strip plate marking block (2) and the left end strip plate marking block (3) are respectively installed on the base plate (1) through the right positioning pin (4) and the left positioning pin (5); the large curvature titanium alloy serrated strip to be manufactured is divided into two parts: the right end strip plate (b) and the left end strip plate (a). Block; the upper surface profiles of the right-end strip plate marking block (2) and the left-end strip plate marking block (3) are respectively the same as the profiles of the right-end strip plate (b) and the left-end strip plate (a); the right-end strip plate marking block (2) and the left-end strip plate marking block (3) are installed on the bottom plate (1) separately or simultaneously according to the requirements of the manufacturing process; when the right-end strip plate marking block (2) and the left-end strip plate marking block are installed on the bottom plate (1) at the same time, the inner edges of the right-end strip plate marking block (2) and the left-end strip plate marking block (3) contact each other, and the upper surface profile formed after the alignment is the same as the profile of the complete strip plate, and the outline after the combination is the same as the outline of the complete strip plate; The outer end of the right end plate marking block (2) is provided with a drilling mechanism (6), and two drilling mechanisms (6) are provided on both sides of the inner end; the outer end of the left end plate marking block (3) is provided with a drilling mechanism (6), and two drilling mechanisms (6) are provided on both sides of the inner end; The drilling mechanism (6) comprises a base (6.1), a flip drilling jig (6.2) and a latch (6.3); the base (6.1) is mounted on the right-end plate-marking block (2) or the left-end plate-marking block (3); the flip drilling jig (6.2) is mounted on the base (6.1) by means of an axial plug-in connection, so that the flip drilling jig (6.2) rotates in the middle of the fork ear of the base (6.1) and is fixed by the latch (6.3); The method described herein comprises the following specific steps: Step 1: Remove the right-end plate marking block (2) and the drilling mechanism (6) thereon from the bottom plate (1), retain the left-end plate marking block (3) and the drilling mechanism (6) thereon, and expose the weld edge contour of the left-end plate marking block (3) for marking; Step 2: Take out the pin (6.3) of the drilling mechanism (6) on the left end strip plate marking block (3), rotate and open the flip drilling jig (6.2), at this time the upper surface of the left end strip plate marking block (3) is in an open state, place the formed left end strip plate (a) rough material on the left end strip plate marking block (3), and position it according to the corresponding reinforcement groove on the left end strip plate marking block (3), press the left end strip plate (a) rough material so that it fits and is fixed on the upper surface of the left end strip plate marking block (3); Step 3: Rotate the flip drill jig (6.2) on the left end strip plate marking block (3) to the upper surface of the left end strip plate (a) rough material, install the pin (6.3), fix the rear drilling tool to make a hole, insert a positioning pin of corresponding diameter into the hole, fix the left end strip plate (a) rough material and mark the weld position line on the back of the left end strip plate (a) rough material according to the welding edge contour of the left end strip plate marking block (3), remove the pin (6.3) again and rotate to open the flip drill jig (6.2), and remove the marked left end strip plate (a) rough material; Step 4: Remove the left-end plate marking block (3) and the drilling mechanism (6) thereon from the base plate (1), and then install the right-end plate marking block (2) and the drilling mechanism (6) thereon on the base plate (1), with the weld edge contour of the right-end plate marking block (2) exposed for marking; Step 5. Take out the pin (6.3) of the drilling mechanism (6) on the right end strip plate marking block (2), rotate and open the flip drilling jig (6.2), at this time the upper surface of the right end strip plate marking block (2) is in an open state, place the formed right end strip plate (b) rough material on the right end strip plate marking block (2), and position it according to the corresponding reinforcement groove on the left end strip plate marking block (3), press the right end strip plate (b) rough material so that it fits and is fixed on the upper surface of the right end strip plate marking block (2); Step 6: Rotate the flip drill jig (6.2) on the right-end strip plate marking block (2) to the upper surface of the right-end strip plate (b) rough material, install the pin (6.3), fix the rear drilling tool to make a hole, insert a positioning pin of corresponding diameter into the hole, fix the right-end strip plate (b) rough material and mark the weld position line on the back of the right-end strip plate (b) rough material according to the welding edge contour of the right-end strip plate marking block (2), remove the pin (6.3) again and rotate to open the flip drill jig (6.2), and remove the marked right-end strip plate (b) rough material; Step 7: After the marking, the left end strip (a) and the right end strip (b) are turned over, and the welding edge strips are laser cut according to the markings. The edge oxide layer is filed and removed. The surfaces of the strips are pickled to remove attached impurities and oil stains. Step 8: Align the weld seams of the left-end strip plate (a) and the right-end strip plate (b) processed in step 7 and weld them together to form an integrated strip plate. Step 9: Grind and polish the weld surface of the integrated strip blank until there is no protruding material on the weld, perform vacuum heat treatment annealing on the integrated strip blank, and correct welding deformation at the same time; Step 10: Install and reset the right-end strip plate marking block (2) and the left-end strip plate marking block (3) at the same time, remove the latch (6.3), rotate and open the flip drill jig (6.2), and then fix the integrated strip plate rough material after heat treatment correction on the upper surface of the right-end strip plate marking block (2) and the left-end strip plate marking block (3), and mark the integrated strip plate contour shape on the back of the strip plate according to the contour of the marking block; Step 11: Turn over the scribed integral strip blank, laser cut the strip shape according to the scribed lines, and file the cut edges to remove burrs; Step 12: Install the cut integrated strip again on the right strip marking block (2) and the left strip marking block (3), and use the corresponding reinforcement grooves on the surface for positioning. At this time, the serrated profile of the strip is inspected to finally obtain a large curvature serrated strip.

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