A spot welding fixture before girth welding for segmented welding and its use method

Abstract

A pre-spot welding fixture for ring welding for segmented welding and a method for using the same belong to the technical field of welding fixtures. The upper end of the bottom plate is provided with a plurality of supports and positioning blocks arranged alternately one by one, the upper end of the support is provided with a parts insertion hole, and the upper surface of the positioning block is provided with a parts-shaped groove. The positioning shaft and the angular shaft are connected to the support, and a washer is provided on the outside of the positioning shaft and the angular shaft, and the top end is screwed to the fixing nut, and the fixing nut presses the washer. One end of the pressure plate is hinged to one end of the upper surface of the positioning block, and the other end is sleeved on the outside of the middle of the threaded rod. The lower end of the threaded rod is hinged to the other end of the upper surface of the positioning block, and the upper end is screwed to the pressure plate nut, and the pressure plate nut is used to press the pressure plate. The present invention realizes the precise positioning of the welding single part, reduces the labor intensity of the operator, prevents compression deformation, avoids the problem of the fixture being unusable or over-positioning due to part deformation after welding, and the problem of the part being unable to be removed from the fixture due to deformation, and realizes the precise positioning and fixation between each single product.

Description

Technical Field

[0001] The invention relates to a spot welding fixture before girth welding for segmented welding and a use method thereof, belonging to the technical field of welding fixtures. Background Art

[0002] Conventional fixtures typically employ a uniform positioning and clamping method for parts with multiple weld locations, particularly those with strict dimensional and positional accuracy requirements between welded components. This approach ignores the structural specificities of these parts, resulting in insufficient positioning accuracy. Furthermore, inappropriate clamping methods often exacerbate part deformation.

[0003] During the welding process, parts are subject to high temperatures and are prone to thermal deformation. This not only affects the dimensional accuracy of the parts but can also make them difficult to remove from the fixture. To avoid damage to the parts during disassembly, the fixture must sometimes be destroyed, which undoubtedly increases production costs.

[0004] Even more seriously, after the parts have been welded in sections, deformation can easily cause the upper structure of the fixture to over-position during secondary clamping, preventing smooth installation of the parts. To ensure welding conditions are met, operators must frequently repair and maintain the fixture, which not only increases labor intensity, but also significantly wastes work hours and leads to increased repair costs. Summary of the Invention

[0005] In order to solve the problems existing in the background technology, the present invention provides a spot welding fixture before girth welding for segmented welding and a method for using the same.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a pre-spot welding fixture for girth welding for segmented welding, comprising a base plate, a support, a positioning block, a main nozzle fixing mechanism and a tube-type fixing mechanism; a plurality of supports and positioning blocks alternately arranged one by one are fixed on the upper end of the base plate along the direction of the part, a part insertion hole and a main nozzle fixing mechanism are provided on the upper end of each support, a part-forming groove is provided on the upper surface of each positioning block, and a tube-type fixing mechanism is provided on the upper end of the part-forming groove.

[0007] Each of the main nozzle fixing mechanisms includes a washer, a fixing nut, a positioning shaft and an angular shaft; the positioning shaft and the angular shaft are fixedly connected to the support, and the outer sides of the positioning shaft and the outer sides of the angular shaft are both equipped with washers, and the top ends of the positioning shaft and the top ends of the angular shaft are respectively screwed with corresponding fixing nuts, and the fixing nuts respectively press the corresponding washers.

[0008] Each of the tubular fixing mechanisms includes a pressure plate, a pressure plate nut and a threaded rod; one end of the pressure plate is hinged to one end of the upper surface of the positioning block, and the other end of the pressure plate is ring-sheathed on the outer side of the middle part of the vertically arranged threaded rod; the lower end of the threaded rod is hinged to the other end of the upper surface of the positioning block, and the upper end of the threaded rod is threadedly screwed to the pressure plate nut, and the pressure plate nut is used to tighten the pressure plate.

[0009] A method for using a spot welding fixture before girth welding for segmented welding according to the present invention comprises the following steps:

[0010] S1: Install all main nozzles into the corresponding supports and pre-tighten them with the corresponding fixing nuts;

[0011] S2: Install all the tube types into the corresponding part grooves of the positioning blocks, connect the two ends of each tube type to the corresponding main nozzles, and use the corresponding pressure plate nuts and pressure plates for pre-clamping;

[0012] S3: Adjust the connection status of the welding part between the pipe type and the corresponding main nozzle to be qualified;

[0013] S4: Tighten the fixing nut and the pressure plate nut to clamp;

[0014] S5: Spot welding is performed on welding position A, welding position C, welding position E, welding position G and welding position J;

[0015] S6: Remove all parts and perform circumferential welding on the spot welding positions described in S5;

[0016] S7: Remove the positioning block from the base plate;

[0017] S8: Re-fix and clamp all parts on the support;

[0018] S9: Spot welding is performed on welding position B, welding position D, welding position F and welding position H;

[0019] S10: Remove all parts and perform circumferential welding on the spot welding positions described in S9;

[0020] S11: Re-fix and clamp all parts on the support;

[0021] S12: Spot welding is performed on the welding position K;

[0022] S13: After all parts are removed, perform circumferential welding on welding position K.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention achieves more accurate positioning of welded parts by accurately calculating the position angle and size of each single part; at the same time, a clamping method that combines nut clamping and contoured pressure plate clamping is adopted, which not only simplifies the operation and reduces the labor intensity of the operator, but also prevents compression deformation and is more adaptable to the part structure; in addition, the fixture is designed with a detachable structure, which effectively avoids the problem of the fixture being unusable or over-positioning due to part deformation after welding, and the problem of parts being unable to be removed from the fixture due to deformation, thereby achieving precise positioning and fixation between each single product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 yes Figure 1 sectional expansion diagram of the profile;

[0027] Figure 3 It is a structural diagram of the base plate;

[0028] Figure 4 yes Figure 3 sectional expansion diagram of the profile;

[0029] Figure 5 It is a structural diagram of the support;

[0030] Figure 6 yes Figure 5 sectional view of

[0031] Figure 7 It is a structural diagram of a form of positioning block;

[0032] Figure 8 yes Figure 7 LL sectional expansion diagram;

[0033] Figure 9 yes Figure 8 MM cross-sectional view;

[0034] Figure 10 It is a structural diagram of another form of positioning block;

[0035] Figure 11 yes Figure 10 NN sectional expansion diagram;

[0036] Figure 12 yes Figure 11 PP cross-sectional view. DETAILED DESCRIPTION

[0037] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] A pre-spot welding fixture for girth welding for segmented welding comprises a base plate 1, a support 2, a positioning block 16, a main nozzle fixing mechanism, and a tube fixing mechanism. The base plate 1 is a form-fitting structure made of LY12 aluminum alloy, which reduces the overall weight of the fixture and facilitates turnover. The base plate 1 is provided with a handle 20 to facilitate the transportation of the fixture, making it more practical. The upper end of the base plate 1 is fixed with a plurality of supports 2 and positioning blocks 16, which are alternately arranged along the direction of the parts via corresponding cylindrical pins and screws. The positioning surface of the support 2 is used to position the main nozzle, and the positioning block 16 is a tube-fitting structure, and the form-fitting surface is used to position the tube. The support 2 at one end is provided with a positioning block avoidance. The support 2 and positioning block 16 are used to ensure the position of each welded product. The upper end of each support 2 is provided with a part insertion hole and a main nozzle fixing mechanism. The upper surface of each positioning block 16 is provided with a part-fitting groove, and the upper end of each part-fitting groove is provided with a tube fixing mechanism.

[0039] Each main nozzle fixing mechanism includes a washer 11, a fixing nut 12, a positioning shaft 13, and an angular shaft 14; the positioning shaft 13 and the angular shaft 14 are fixedly connected to the support 2 by corresponding screws, and the positioning shaft 13 and the angular shaft 14 cooperate with the contact surface of the support 2 as a centering and angular reference; the outer side of the positioning shaft 13 and the outer side of the angular shaft 14 are both covered with a washer 11, and the top of the positioning shaft 13 and the top of the angular shaft 14 are respectively screwed with the corresponding fixing nut 12, and the fixing nut 12 respectively presses the corresponding washer 11. The main nozzle is tightened with the fixing nut 12, which is easy to operate and convenient to disassemble, and the labor intensity of the operator is low. Since the welding positions of the parts are not identical, the positioning shafts 13 at different positions have the same structure but different sizes, and the angular shafts 14 at different positions have the same structure but different sizes.

[0040] Each of the tubular fixing mechanisms includes a pressure plate 8, a pressure plate nut 9, and a threaded rod 10; one end of the horizontally arranged pressure plate 8 is hinged to one end of the upper surface of the positioning block 16 via a corresponding cylindrical pin, and the other end of the pressure plate 8 is sleeved on the outside of the middle of the vertically arranged threaded rod 10. The lower end of the threaded rod 10 is hinged to the other end of the upper surface of the positioning block 16 via a corresponding cylindrical pin, and the upper end of the threaded rod 10 is threadedly connected to the pressure plate nut 9, and the pressure plate nut 9 is used to press the pressure plate 8. The tubular shape is pressed by the pressure plate 8 to prevent deformation of the tubular shape, and the pressing structure is a combination of the cylindrical pin, the pressure plate 8, the pressure plate nut 9, and the threaded rod 10. After the pressure plate nut 9 is removed, the pressure plate 8 and the threaded rod 10 can be rotated outward to avoid interference.

[0041] A method for using a spot welding fixture before girth welding for segmented welding according to the present invention comprises the following steps:

[0042] There are ten welding positions on the part. Due to the material and structure of the part, direct welding is prone to deformation, so it is designed to be welded in sections.

[0043] S1: Install all main nozzles onto the corresponding supports 2 and pre-tighten them using the corresponding fixing nuts 12;

[0044] S2: All tube types are respectively installed into the corresponding part-adaptive grooves of the positioning block 16, so that both ends of each tube type are connected to the corresponding main nozzle, and pre-clamped using the corresponding pressure plate nut 9 and pressure plate 8;

[0045] S3: Adjust the connection status of the welding part between the pipe type and the corresponding main nozzle to be qualified;

[0046] S4: Tighten the fixing nut 12 and the pressure plate nut 9 to clamp the structure to ensure complete fixation.

[0047] S5: Spot welding is performed on welding position A, welding position C, welding position E, welding position G and welding position J;

[0048] S6: Remove all parts and perform circumferential welding on the spot welding positions described in S5;

[0049] S7: At this time, after girth welding, the parts are deformed due to the welding temperature, which makes the positioning block tube easily over-positioned. In order to avoid over-positioning caused by re-assembly on the fixture, the positioning block 16 is removed from the base plate 1 before repeated clamping;

[0050] S8: Re-fix and clamp all parts on support 2;

[0051] S9: Spot welding is performed on welding position B, welding position D, welding position F and welding position H;

[0052] S10: Remove all parts and perform circumferential welding on the spot welding positions described in S9;

[0053] S11: Re-fix and clamp all parts on support 2;

[0054] S12: Spot welding is performed on the welding position K;

[0055] S13: After all parts are removed, perform circumferential welding on welding position K. After welding position K, there is no argon gas position for welding, so it is welded last.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0057] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for using a spot welding fixture before girth welding for segmented welding, the method being based on the spot welding fixture before girth welding, the spot welding fixture before girth welding comprising a base plate (1), a support (2), a positioning block (16), a main nozzle fixing mechanism and a tube type fixing mechanism; a plurality of supports (2) and positioning blocks (16) arranged alternately one by one are fixed to the upper end of the base plate (1) along the direction of the part, the upper end of each support (2) is provided with a part insertion hole and a main nozzle fixing mechanism, the upper surface of each positioning block (16) is provided with a part-adaptive groove, and the upper end of the part-adaptive groove is provided with a tube type fixing mechanism; the characteristics are: The method comprises the following steps: There are ten welding positions on the part, including welding position A, welding position B, welding position C, welding position D, welding position E, welding position F, welding position G, welding position H, welding position J and welding position K arranged in sequence; S1: Install all main nozzles into the corresponding supports (2) and pre-tighten them using the corresponding fixing nuts (12); S2: All the tube types are respectively installed into the corresponding part grooves of the positioning block (16), so that the two ends of each tube type are respectively connected to the corresponding main nozzle, and pre-clamped using the corresponding pressure plate nut (9) and pressure plate (8); S3: Adjust the connection status of the welding part between the pipe type and the corresponding main nozzle to be qualified; S4: Tighten the fixing nut (12) and the pressure plate nut (9) to clamp; S5: Spot welding is performed on welding position A, welding position C, welding position E, welding position G and welding position J; S6: Remove all parts and perform circumferential welding on the welding positions described in S5; S7: Remove the positioning block (16) from the base plate (1); S8: Re-fix and clamp all parts on the support (2); S9: Spot welding is performed on welding position B, welding position D, welding position F and welding position H; S10: Remove all parts and perform circumferential welding on the welding positions described in S9; S11: Re-fix and clamp all parts on the support (2); S12: Spot welding is performed on the welding position K; S13: After all parts are removed, perform circumferential welding on welding position K.

2. The method for using the pre-spot welding fixture for girth welding for segmented welding according to claim 1, characterized in that: Each main nozzle fixing mechanism includes a washer (11), a fixing nut (12), a positioning shaft (13) and an angular shaft (14); the positioning shaft (13) and the angular shaft (14) are fixedly connected to the support (2); the outer side of the positioning shaft (13) and the outer side of the angular shaft (14) are both covered with a washer (11); the top end of the positioning shaft (13) and the top end of the angular shaft (14) are respectively screwed to the corresponding fixing nut (12); and the fixing nut (12) respectively presses the corresponding washer (11).

3. The method for using the pre-spot welding fixture for girth welding for segmented welding according to claim 1, characterized in that: Each of the tubular fixing mechanisms comprises a pressure plate (8), a pressure plate nut (9) and a threaded rod (10); one end of the pressure plate (8) is hinged to one end of the upper surface of the positioning block (16), the other end of the pressure plate (8) is sleeved on the outside of the middle of the vertically arranged threaded rod (10), the lower end of the threaded rod (10) is hinged to the other end of the upper surface of the positioning block (16), the upper end of the threaded rod (10) is threadedly connected to the pressure plate nut (9), and the pressure plate nut (9) is used to press the pressure plate (8).

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