A thin-wall sheet metal welding piece welding seam turning clamp and method

Abstract

The present application belongs to the technical field of thin-walled part processing, and discloses a welding seam turning clamp and method for thin-walled sheet metal welding parts. The clamp comprises a base, a profiled positioning ring coaxially arranged on the base and used for supporting and positioning the outer side surface of the sheet metal part, and a profiled pressing ring coaxially connected to the profiled positioning ring and used for supporting and positioning the inner side surface of the sheet metal part. After the profiled positioning ring and the profiled pressing ring are connected and clamp the sheet metal part, the sheet metal part, the base, the profiled positioning ring and the profiled pressing ring are coaxial, the profiled pressing ring is located on one side of the honeycomb seat of the sheet metal part and exposes the welding lap on the honeycomb seat. The present application can correct the deformation position when turning the ring-shaped electron beam welding seam of the thin-walled sheet metal welding part, so as to reduce the whole jump of the part and meet the processing requirements.

Description

Technical Field

[0001] This invention belongs to the field of thin-walled parts processing technology, specifically relating to a welding seam turning fixture and method for thin-walled sheet metal welded parts. Background Technology

[0002] Thin-walled sheet metal parts generally exhibit significant inherent irregular deformation, which can lead to secondary deformation when welded to other machined parts. To meet assembly positioning requirements before electron beam welding, specific types of process welding stops must be pre-installed at the welding locations on the machined parts to position the thin-walled sheet metal parts. Since these welding stops are not part of the product design, they must be removed after electron beam welding. For example... Figure 1 The thin-walled casing shown is a thin-walled sheet metal part, mainly comprising a rear housing 7-1 and a honeycomb base 7-2, wherein, as Figure 2 As shown, the rear housing 7-1 includes a rear housing annular segment 7-1-1 and a rear housing flared segment 7-1-2, the small end of the rear housing flared segment 7-1-2 being coaxially connected to one end of the rear housing annular segment 7-1-1; as Figure 1 As shown, the honeycomb base 7-2 includes a frustum section 7-2-1 and a cylindrical section 7-2-2. The larger end of the frustum section 7-2-1 is connected to one end of the cylindrical section 7-2-2, and the smaller end of the frustum section 7-2-1 is connected to the larger end of the rear housing horn section 7-1-2. Figure 3 As shown, the small end of the frustum section 7-2-1 is provided with a welding stop 9. The welding stop 9 has a welding shoulder 9-1 on the inner side (left side) of the small end of the frustum section 7-2-1. After the frustum section 7-2-1 and the rear housing horn section 7-1-2 are welded at the weld area 8, the welding shoulder 9-1 needs to be removed, and the connection between the small end of the frustum section 7-2-1 and the rear housing horn section 7-1-2 needs to be machined flat. When machining the annular electron beam weld of the thin-walled sheet metal welded part (i.e., sheet metal part 7), the ellipse of the welded part is often too large after welding, and there is even a problem of severe local deformation. This causes the circumferential runout of the weld area to be too large, making it impossible to remove all the process welding stops on the lathe. A large number of welding stops remain and can only be removed by manual grinding, which is inefficient and results in poor product quality. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention aims to provide a machining fixture and method for weld seams of thin-walled sheet metal welded parts. The present invention can correct deformed parts during the machining of annular electron beam weld seams of thin-walled sheet metal welded parts (such as thin-walled casings), thereby reducing the overall circumferential runout of the parts and meeting the processing requirements.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A welding seam turning fixture for thin-walled sheet metal welded parts includes a base. A conformal positioning ring for supporting and positioning the outer side of the sheet metal part is coaxially provided on the base. A conformal pressure ring for supporting and positioning the inner side of the sheet metal part is coaxially connected to the conformal positioning ring. When the conformal positioning ring and the conformal pressure ring are connected and clamp the sheet metal part, the sheet metal part, the base, the conformal positioning ring and the conformal pressure ring are coaxial. The conformal pressure ring is located on one side of the honeycomb seat of the sheet metal part and exposes the welding shoulder on the honeycomb seat.

[0006] Preferably, the conformal positioning ring is circumferentially threaded with a plurality of adjusting screws, which are evenly distributed in the circumferential direction of the conformal positioning ring, and the ends of the adjusting screws can contact the rear housing of the sheet metal part.

[0007] Preferably, the end of the adjusting screw can contact the rear housing horn section of the rear housing.

[0008] Preferably, the conformal positioning ring is circular, and the end of the conformal positioning ring is detachably connected to the base by fastening screws; the base is provided with a circular positioning shoulder for center positioning of the end of the conformal positioning ring, and the inner wall of the conformal positioning ring and the outer wall of the positioning shoulder are in clearance fit; when the conformal positioning ring is connected to the base, the positioning shoulder extends into the inner cavity of the conformal positioning ring.

[0009] Preferably, the inner wall of the conformal positioning ring is provided with a cylindrical positioning section for positioning the outer wall of the rear housing ring section of the sheet metal part and a frustum positioning surface for positioning the outer side of the frustum section.

[0010] The inner wall of the cylindrical positioning section and the outer wall of the annular section of the rear housing are in clearance fit; the apex angle of the cone corresponding to the inner wall of the frustum positioning surface is the same as the apex angle of the cone corresponding to the outer wall of the frustum section. When the conformal positioning ring and the conformal pressure ring are connected and clamp the sheet metal part, the inner wall of the frustum positioning surface and the outer wall of the frustum section are in contact.

[0011] Preferably, the conformal positioning ring has an annular groove between the cylindrical positioning section and the frustum positioning surface. When the conformal positioning ring is connected to the conformal pressure ring and clamps the sheet metal part, the weld shoulder is located at the position opposite to the opening of the annular groove.

[0012] Preferably, the conformal pressure ring and the conformal positioning ring are detachably fixedly connected by clamping screws. When the conformal positioning ring and the conformal pressure ring are connected and clamp the sheet metal part, the end of one end of the conformal pressure ring contacts the inner wall of the frustum section of the honeycomb seat and clamps the frustum section with the frustum positioning surface.

[0013] Preferably, the outer side of the base is provided with an alignment groove for alignment when the base is installed on the machine tool.

[0014] The present invention also provides a method for machining the weld seam of a thin-walled sheet metal welded part, the method using the weld seam machining fixture for thin-walled sheet metal welded parts described above, the method comprising:

[0015] The base of the welding seam turning fixture for thin-walled sheet metal welded parts is clamped on the machine tool;

[0016] The alignment of the outer circle of the base with the point of alignment should be within 0.02mm;

[0017] Install the sheet metal part onto the weld seam turning fixture of the thin-walled sheet metal welded part, so that the conformal positioning ring supports and positions the outer side of the sheet metal part, the conformal pressure ring supports and positions the inner side of the sheet metal part, and the conformal positioning ring and the conformal pressure ring are connected and clamp the sheet metal part.

[0018] After the sheet metal part is clamped, the weld shoulder on the sheet metal part is machined off.

[0019] Preferably, the conformal positioning ring is circumferentially threaded with a plurality of adjusting screws, which are evenly distributed in the circumferential direction of the conformal positioning ring, and the ends of the adjusting screws can contact the rear housing of the sheet metal part.

[0020] When installing sheet metal parts onto the weld seam turning fixture of thin-walled sheet metal welded parts, the shape of the sheet metal parts is adjusted by adjusting the adjusting screws so that the surface runout at the weld seam is within the allowable range, and then the weld shoulder is turned off.

[0021] The present invention has the following beneficial effects:

[0022] In this invention, a weld seam turning fixture for thin-walled sheet metal welded parts allows the base to be mounted on a machine tool, thus connecting the entire weld seam turning fixture to the machine tool. A conformal positioning ring supports and positions the outer surface of the sheet metal part, while a conformal pressure ring supports and positions the inner surface. This improves the overall shape and rigidity of the sheet metal part after clamping, enabling shape correction for sheet metal parts (such as thin-walled housings) and increasing their concentricity. This allows for turning on a lathe, removing weld shoulders. Compared to existing technologies, this fixture effectively solves the problems of low efficiency, difficulty in guaranteeing dimensional accuracy, and instability when removing weld shoulders through manual grinding. Attached Figure Description

[0023] Figure 1 This is a longitudinal section view (one-side cross-section) of the thin-walled casing.

[0024] Figure 2 This is a longitudinal section (one-side cross-section) of the rear housing of the thin-walled casing;

[0025] Figure 3 for Figure 1 Enlarged schematic diagram of the middle section (I);

[0026] Figure 4 This is a schematic diagram of the main sectional view of the weld seam turning fixture for thin-walled sheet metal welded parts in an embodiment of the present invention;

[0027] Figure 5 yes Figure 4 Enlarged schematic diagram of part A in the image (before welding shoulder cutting);

[0028] Figure 6 yes Figure 4 Enlarged schematic diagram of part A (after welding shoulder cutting);

[0029] Figure 7 yes Figure 2 Top view.

[0030] In the diagram, 1-base, 1-1-alignment groove, 1-2-positioning shoulder, 2-fastening screw, 3-conformal positioning ring, 3-1-cylindrical positioning section, 3-2-frustum positioning surface, 4-clamping screw, 5-conformal pressure ring, 6-adjusting screw, 7-sheet metal part, 7-1-rear housing, 7-1-1-rear housing annular section, 7-1-2-rear housing flared section, 7-2-honeycomb seat, 7-2-1-frustum section, 7-2-2-cylindrical section, 7-3-annular groove, 8-weld area, 9-weld stop, 9-1-weld shoulder, 9-2-surface after machining off the weld shoulder. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0032] Reference Figure 4 and Figure 7 , combined Figures 1-3This embodiment of the weld seam turning fixture for thin-walled sheet metal welded parts includes a base 1. A conformal positioning ring 3, coaxially mounted on the base 1, supports and positions the outer side of the sheet metal part 7. A conformal pressure ring 5, coaxially connected to the conformal positioning ring 3, supports and positions the inner side of the sheet metal part 7. When the conformal positioning ring 3 and the conformal pressure ring 5 are connected and clamp the sheet metal part 7, the sheet metal part 7, base 1, conformal positioning ring 3, and conformal pressure ring 5 are coaxial. The conformal pressure ring 5 is located on one side of the honeycomb seat 7-2 of the sheet metal part 7, exposing the weld shoulder 9-1 on the honeycomb seat 7-2. The weld seam turning fixture for thin-walled sheet metal welded parts with the above structure can clamp the sheet metal part 7 (i.e., the thin-walled housing) to which the weld shoulder 9-1 is to be removed, while also ensuring that the weld shoulder 9-1 is exposed in a position convenient for turning (see...). Figures 4-6 and combined Figure 3 ).

[0033] Reference Figures 4-6 The method for machining weld seams using the weld seam machining fixture for thin-walled sheet metal welded parts described in the above embodiments includes the following steps:

[0034] Step 1: Mount the base 1 of the weld seam turning fixture for thin-walled sheet metal welded parts onto the machine tool;

[0035] Step 2: Align the outer circle of base 1 with the points within 0.02mm to ensure the coaxiality of the entire fixture with the lathe;

[0036] Step 3: Install the sheet metal part 7 onto the weld seam turning fixture of the thin-walled sheet metal welded part. Specifically, first remove the conformal pressure ring 5 from the conformal positioning ring 3, then insert one end of the rear housing 7-1 of the sheet metal part 7 into the inner cavity of the conformal positioning ring 3, so that the rear housing 7-1 fits against the inner side of the conformal positioning ring 3, so that the conformal positioning ring 3 supports and positions the outer side of the sheet metal part 7. Then, install the conformal pressure ring 5 onto the conformal positioning ring 3, so that the lower end of the conformal pressure ring 5 abuts against the inner side of the honeycomb seat 7-2 of the sheet metal part 7. Then, tighten the conformal pressure ring 5 and the conformal positioning ring 3, so as to achieve the positioning and clamping of the sheet metal part 7 by the conformal positioning ring 3 and the conformal pressure ring 5.

[0037] Step 4: After clamping sheet metal part 7, machine off the weld shoulder 9-1 on sheet metal part 7. (See attached image) Figures 4-6 and Figure 1 During turning, the cutting tool extends into the inner cavity of the sheet metal part 7 from one side of the cylindrical section 7-2-2 of the honeycomb seat 7-2 (from... Figures 4-6 Looking from above, the cutting tool extends into the inner cavity of the sheet metal part 7 from top to bottom. Then, the weld shoulder 9-1 is removed with the cutting tool. The surface after removing the weld shoulder is as follows: Figure 6 As shown.

[0038] As a preferred embodiment of the present invention, based on the above embodiments, see [link to previous document]. Figure 4 and Figure 7In this embodiment, a plurality of adjusting screws 6 are threadedly connected to the circumferentially of the conformal positioning ring 3. The plurality of adjusting screws 6 are evenly distributed in the circumferential direction of the conformal positioning ring 3, and the ends of the adjusting screws 6 can contact the rear housing 7-1 of the sheet metal part 7. See [reference needed]. Figure 4 At this time, the end of the adjusting screw 6 is just below the contact point between the conformal pressure ring 5 and the sheet metal part 7. The head of these adjusting screws 6 pushes against the housing 7-1, thereby adjusting the shape of the sheet metal part 7. In other words, these adjusting screws 6 can make the outline of the sheet metal part 7 more rounded, and at the same time further improve the rigidity of the sheet metal part 7 at the outer periphery where these adjusting screw 6 support points are located, which is more conducive to the turning of the weld shoulder 9-1 on a lathe.

[0039] As a further improvement to the above embodiment, in this embodiment, when setting the adjusting screw 6, the end of the adjusting screw 6 should be as close as possible to the weld stop. This is more conducive to improving the rigidity of the sheet metal part 7 at the outer periphery where these adjusting screw 6 support points are located, and thus more conducive to the turning of the weld shoulder 9-1 using a lathe. For those skilled in the art, the contact position between the adjusting screw 6 and the sheet metal part 7 can be determined according to the specific structure and form of the weld stop 9, and the present invention does not impose specific limitations.

[0040] As a further improvement to the above embodiments, in this embodiment, reference is made to... Figure 3 Since the rear housing horn section 7-1-2 has relatively low stiffness due to dimensional changes and is prone to deformation, this embodiment sets the adjusting screw 6 at its end so that it can contact the rear housing horn section 7-1-2 of the rear housing 7-1. This is beneficial to improve the stiffness of the rear housing horn section 7-1-2, and thus more beneficial to the turning of the weld shoulder 9-1 on a lathe.

[0041] As a preferred embodiment of the above-described solution of the present invention, such as Figures 4-6 As shown, in this embodiment, the conformal positioning ring 3 is circular, and its end is detachably connected to the base 1 by fastening screws 2. This facilitates the removal of welding shoulders 9-1 of sheet metal parts 7 of different specifications by setting conformal positioning rings 3 of different specifications, thus improving the applicability of the fixture of the present invention. The base 1 is provided with a circular positioning shoulder 1-2 for center positioning of the end of the conformal positioning ring 3. The inner wall of the conformal positioning ring 3 and the outer wall of the positioning shoulder 1-2 are in clearance fit. When the conformal positioning ring 3 is connected to the base 1, the positioning shoulder 1-2 extends into the inner cavity of the conformal positioning ring 3. By setting the positioning shoulder 1-2, the coaxiality between the base 1 and the conformal positioning ring 3 during installation can be ensured.

[0042] As a preferred embodiment of the above-described solution of the present invention, such as Figures 4-6As shown, in this embodiment, the inner wall of the conformal positioning ring 3 is provided with a cylindrical positioning section 3-1 for positioning the outer wall of the rear housing annular segment 7-1-1 of the sheet metal part 7 and a frustum positioning surface 3-2 for positioning the outer side of the frustum segment 7-2-1. The inner wall of the cylindrical positioning section 3-1 and the outer wall of the rear housing annular segment 7-1-1 are in clearance fit, so the cylindrical positioning section 3-1 is used to accurately position the rear housing annular segment 7-1-1, ensuring the coaxiality of the rear housing annular segment 7-1-1 and the conformal positioning ring 3. The apex angle of the cone corresponding to the inner wall of the frustum positioning surface 3-2 is the same as the apex angle of the cone corresponding to the outer wall of the frustum segment 7-2-1. When the conformal positioning ring 3 is connected to the conformal pressure ring 5 and clamps the sheet metal part 7, the inner wall of the frustum positioning surface 3-2 and the outer wall of the frustum segment 7-2-1 are in contact, thus ensuring the effective support of the frustum segment 7-2-1 by the conformal positioning ring 3. This embodiment, through a reasonable structural design, provides multi-point and surface support for the sheet metal part 7 when the conformal positioning ring 3 and conformal pressure ring 5 are used for positioning and clamping. This ensures the rigidity of the entire sheet metal part 7 when it is machined on a lathe to weld the shoulder 9-1, thereby guaranteeing the dimensions of the sheet metal part 7 after cutting.

[0043] As a preferred embodiment of the above-described solution of the present invention, such as Figures 4-6 As shown, in this embodiment, an annular groove 7-3 is provided on the conformal positioning ring 3 between the cylindrical positioning section 3-1 and the frustum positioning surface 3-2. When the conformal positioning ring 3 is connected to the conformal pressure ring 5 and clamps the sheet metal part 7, the welding shoulder 9-1 is located opposite to the opening of the annular groove 7-3. If the inner wall of the conformal positioning ring 3 is in close contact with the sheet metal part 7 near the weld area 8, the vibration will be transmitted to the conformal positioning ring 3 and the base 1 when the cutting tool cuts the welding shoulder 9-1 due to the poor concentricity at the welding shoulder 9-1 and the relatively thin and rigid sheet metal part 7. During processing, the sheet metal part 7 is prone to irregular jumping, which makes the flatness and size of the part after cutting the welding shoulder 9-1 less than ideal, and the surface needs to be manually repaired. Therefore, this embodiment provides the aforementioned annular groove 7-3. Due to the presence of the annular groove 7-3, the sheet metal part 7 is suspended at the welding shoulder 9-1, providing a certain degree of vibration isolation. Even if vibration occurs during machining, it will be quickly absorbed and eliminated. Simultaneously, since localized heat is generated at the cutting position during cutting, and because the sheet metal part 7 has a relatively thin wall, this heat will generate thermal stress inside the sheet metal part 7, causing deformation. Therefore, this invention can also blow cold air into the annular groove 7-3 to cool the cutting area, preventing localized overheating and deformation of the sheet metal part 7. In this case, the annular groove 7-3 acts as a cooling groove.

[0044] As a preferred embodiment of the above-described solution of the present invention, such as Figures 4-6As shown, in this embodiment, the conformal pressure ring 5 and the conformal positioning ring 3 are detachably fixedly connected by the clamping screw 4. When the conformal positioning ring 3 and the conformal pressure ring 5 are connected and clamp the sheet metal part 7, one end of the conformal pressure ring 5 contacts the inner wall of the frustum section 7-2-1 of the honeycomb seat 7-2 and clamps the frustum section 7-2-1 with the frustum positioning surface 3-2. The clamping screw 4 can realize the detachable connection between the conformal pressure ring 5 and the conformal positioning ring 3, ensuring the normal assembly and disassembly of the sheet metal part 7. At the same time, it can also control the clamping force on the sheet metal part 7, so that the sheet metal part 7 is clamped in a stable state without being damaged.

[0045] As a preferred embodiment of the above-described solution of the present invention, such as Figures 4-6 As shown, in this embodiment, the outer side of the base 1 is provided with an alignment groove 1-1 for alignment when the base 1 is installed on the machine tool. By setting the alignment groove 1-1, it is beneficial to ensure the coaxiality of the axis of the base 1 with the lathe spindle after the fixture of the present invention is clamped on the lathe, and further ensures the coaxiality of the sheet metal part 7, the conformal positioning ring 3 and the conformal pressure ring 5 with the lathe spindle.

[0046] As a preferred embodiment of the above-described solution of the present invention, such as Figure 7 As shown, in this embodiment, 16 M16 threaded through holes are evenly opened circumferentially on the sidewall of the conformal positioning ring 3. The adjusting screw 6 is connected through these threaded through holes, which are opened radially along the conformal positioning ring 3. 12 M16 threaded holes are evenly opened circumferentially on the top of the conformal positioning ring 3. These threaded holes are used to connect with the clamping screw 4.

[0047] As can be seen from the above scheme, the advantages of the present invention are: since the positioning surface of the conforming positioning ring and the conforming pressure ring of the weld seam turning fixture of the thin-walled sheet metal welded part are both consistent with the theoretical surface of the thin-walled sheet metal part 7, when the thin-walled sheet metal part is placed between the conforming positioning ring and the conforming pressure ring, when the clamping screw is tightened, the conforming positioning surface of the conforming pressure ring will press the thin-walled sheet metal part tightly against the conforming positioning surface of the conforming positioning ring. At this time, the conforming pressure ring and the conforming surface of the conforming positioning ring are equivalent to the female mold and the male mold of the mold, which play a role in correcting and eliminating the overall surface deformation of the thin-walled sheet metal part.

[0048] The adjusting screw installed on the side of the positioning ring can also be used to locally correct the local deformation of the thin-walled sheet metal part, thereby controlling the runout of the weld area of ​​the thin-walled sheet metal part within the allowable range of turning, and maximizing the turning removal of the weld shoulder.

[0049] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Those skilled in the art, upon considering the specification and practicing the invention disclosed herein, will readily conceive of other embodiments of the invention. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be considered as part of the content disclosed in this invention and are all within the protection scope of this invention.

Claims

1. A thin-walled sheet metal welded part weld turning fixture, characterized by, Includes a base (1), on which a conformal positioning ring (3) is coaxially provided to support and position the outer side of the sheet metal part (7), and a conformal pressure ring (5) is coaxially connected to the conformal positioning ring (3) to support and position the inner side of the sheet metal part (7). When the conformal positioning ring (3) and the conformal pressure ring (5) are connected and clamp the sheet metal part (7), the sheet metal part (7), the base (1), the conformal positioning ring (3) and the conformal pressure ring (5) are coaxial. The conformal pressure ring (5) is located on one side of the honeycomb seat (7-2) of the sheet metal part (7) and exposes the welding shoulder (9-1) on the honeycomb seat (7-2). The conformal positioning ring (3) is connected to a plurality of adjusting screws (6) in the circumferential thread. The plurality of adjusting screws (6) are evenly distributed in the circumferential direction of the conformal positioning ring (3). The ends of the adjusting screws (6) can contact the rear housing (7-1) of the sheet metal part (7). The end of the adjusting screw (6) can contact the rear housing horn section (7-1-2) of the rear housing (7-1).

2. The weld bead turning jig for a thin-walled sheet metal welded member according to claim 1, characterized by The conformal positioning ring (3) is circular. The end of the conformal positioning ring (3) is detachably connected to the base (1) by fastening screws (2). The base (1) is provided with a circular positioning shoulder (1-2) for center positioning of the end of the conformal positioning ring (3). The inner wall of the conformal positioning ring (3) and the outer wall of the positioning shoulder (1-2) are in clearance fit. When the conformal positioning ring (3) is connected to the base (1), the positioning shoulder (1-2) extends into the inner cavity of the conformal positioning ring (3).

3. A weld bead turning jig for thin-walled sheet metal welded parts according to claim 2, characterized in that The inner wall of the conformal positioning ring (3) is provided with a cylindrical positioning section (3-1) for positioning the outer wall of the rear shell annular section (7-1-1) of the sheet metal part (7) and a frustum positioning surface (3-2) for positioning the outer side of the frustum section (7-2-1). Among them, the inner wall of the cylindrical positioning section (3-1) and the outer wall of the rear shell annular section (7-1-1) are in clearance fit; the apex angle of the cone corresponding to the inner wall of the frustum positioning surface (3-2) is the same as the apex angle of the cone corresponding to the outer wall of the frustum section (7-2-1). When the conformal positioning ring (3) and the conformal pressure ring (5) are connected and clamp the sheet metal part (7), the inner wall of the frustum positioning surface (3-2) and the outer wall of the frustum section (7-2-1) are in contact.

4. A weld seam turning fixture for thin-walled sheet metal welded parts according to claim 3, characterized in that, An annular groove (7-3) is provided on the conformal positioning ring (3) between the cylindrical positioning section (3-1) and the frustum positioning surface (3-2). When the conformal positioning ring (3) is connected to the conformal pressure ring (5) and clamps the sheet metal part (7), the welded shoulder (9-1) is located at the position opposite to the opening of the annular groove (7-3).

5. A weld seam turning fixture for thin-walled sheet metal welded parts according to claim 3, characterized in that, The conformal pressure ring (5) and the conformal positioning ring (3) are detachably fixedly connected by the clamping screw (4). When the conformal positioning ring (3) and the conformal pressure ring (5) are connected and clamp the sheet metal part (7), one end of the conformal pressure ring (5) contacts the inner wall of the frustum section (7-2-1) of the honeycomb seat (7-2) and clamps the frustum section (7-2-1) with the frustum positioning surface (3-2).

6. A weld seam turning fixture for thin-walled sheet metal welded parts according to claim 1, characterized in that, The outer side of the base (1) is provided with a aligning groove (1-1) for aligning the base (1) when it is installed on the machine tool.

7. A method for machining the weld seam of a thin-walled sheet metal welded part, characterized in that, This method employs the weld seam turning fixture for thin-walled sheet metal welded parts as described in any one of claims 1-6, and the method includes: The base (1) of the welding seam turning fixture for thin-walled sheet metal welded parts is clamped on the machine tool; Align the base (1) so that the outer circle of the point is within 0.02mm; Install the sheet metal part (7) onto the weld seam turning fixture of the thin-walled sheet metal welded part, so that the conformal positioning ring (3) supports and positions the outer side of the sheet metal part (7), the conformal pressure ring (5) supports and positions the inner side of the sheet metal part (7), and the conformal positioning ring (3) and the conformal pressure ring (5) are connected and clamp the sheet metal part (7). After clamping the sheet metal part (7), the weld shoulder (9-1) on the sheet metal part (7) is machined off.

8. The method for machining the weld seam of a thin-walled sheet metal weldment according to claim 7, characterized in that, The conformal positioning ring (3) is connected to a plurality of adjusting screws (6) in the circumferential thread. The plurality of adjusting screws (6) are evenly distributed in the circumferential direction of the conformal positioning ring (3). The ends of the adjusting screws (6) can contact the rear housing (7-1) of the sheet metal part (7). When the sheet metal part (7) is installed on the weld seam turning fixture of the thin-walled sheet metal welded part, the shape of the sheet metal part (7) is adjusted by adjusting the adjusting screw (6) so that the surface runout at the weld seam is within the allowable range, and then the weld shoulder (9-1) is turned off.

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