Pre-circumferential-welding spot welding clamp for segmented welding and using method of pre-circumferential-welding spot welding clamp

Abstract

The invention discloses a pre-girth-welding spot welding clamp for segmented welding and a using method thereof, and belongs to the technical field of welding clamps. A plurality of supports and positioning blocks are alternately arranged at the upper end of the bottom plate one by one, part inserting holes are formed in the upper ends of the supports, and part shape-following grooves are formed in the upper surfaces of the positioning blocks. The positioning shaft and the angular shaft are connected with the support, gaskets are arranged outside the positioning shaft and the angular shaft, the top ends of the positioning shaft and the angular shaft are screwed with fixing nuts, and the fixing nuts press the gaskets. 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 connected with the pressing plate nut in a screwed mode. According to the invention, the precise positioning of a welded single piece is realized, the labor intensity of an operator is reduced, the compression deformation is prevented, the problems that the clamp cannot be used or is over-positioned due to the deformation of a part after welding and the part cannot be detached from the clamp due to the deformation are solved, and the precise positioning and fixing of each single piece of product are realized.

Description

Technical Field

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

[0002] In the prior art, for parts with multiple welding positions, especially special-shaped parts with strict dimensional position accuracy requirements between welded parts, traditional fixtures usually adopt a unified positioning and clamping method, which ignores the particularity of the structure of special-shaped parts and leads to insufficient positioning accuracy. In addition, unreasonable clamping methods often aggravate the deformation problem of parts.

[0003] During the welding process, the parts are affected by high temperature welding and are prone to thermal deformation, which not only affects the dimensional accuracy of the parts, but also may make it difficult to disassemble the parts in the fixture. In order to avoid damage to the parts during the disassembly process, the fixture sometimes has to be destroyed, which undoubtedly increases the production cost.

[0004] What is more serious is that after the parts are welded in sections, due to the influence of deformation, the upper structure of the fixture is prone to over-positioning during the secondary clamping, making it impossible to install the parts smoothly. In order to ensure that the welding conditions are met, the operator has to frequently repair and maintain the fixture, which not only increases the labor intensity, but also seriously wastes working hours and leads to an increase in repair costs. Summary of the invention

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

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a pre-spot welding fixture for ring 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 arranged alternately one by one are fixed in sequence 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-adapting 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-adapting 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 nut threads, 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 ring welding for segment welding according to the present invention comprises the following steps:

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

[0011] S2: All the tube types are respectively installed into the corresponding part-adaptive grooves of the positioning blocks, so that the two ends of each tube type are respectively connected to the corresponding main nozzles, and the corresponding pressing plate nuts and pressing plates are used for pre-clamping;

[0012] S3: Adjust the connection state 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 and fixing welding position A, welding position C, welding position E, welding position G and welding position J;

[0015] S6: Remove all parts and perform ring 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 and fixing welding position B, welding position D, welding position F and welding position H;

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

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

[0021] S12: Spot welding the welding position K;

[0022] S13: After all parts are removed, circumferential welding is performed 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 individual parts by accurately calculating the position angle and size of each individual part; at the same time, a clamping method combining nut clamping and conformal pressure plate clamping is adopted, which not only simplifies the operation and reduces the labor intensity of the operator, but also prevents clamping 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 accurate positioning and fixation between each individual product. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 2 yes Figure 1 The expanded view of the profile;

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

[0028] Figure 4 yes Figure 3 The expanded view of the profile;

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

[0030] Figure 6 yes Figure 5 A cross-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] Fig. 9 yes Figure 8 MM cross-sectional view;

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

[0035] Fig.11 yes Fig.10 NN section expansion diagram;

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

[0037] The technical solution 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 of 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 ring welding for segmented welding includes a base plate 1, a support 2, a positioning block 16, a main nozzle fixing mechanism and a tube type fixing mechanism; the base plate 1 is a conforming structure, and the base plate 1 is made of LY12 aluminum alloy, which reduces the overall weight of the fixture and facilitates turnover. A handle 20 is provided on the base plate 1 to facilitate the transportation of the fixture, which is more practical. The upper end of the base plate 1 is fixed with a plurality of supports 2 and positioning blocks 16 arranged alternately one by one along the direction of the parts through corresponding cylindrical pins and screws in sequence. The positioning surface of the support 2 is used for positioning the main nozzle, and the positioning block 16 is a conforming tube type structure, and the conforming surface is used for tube type positioning. The support 2 at one end is provided with a positioning block avoidance. The support 2 and the positioning block 16 are used to ensure the position of each single piece of the welding product. The upper end of each support 2 is provided with a part insertion hole and a main nozzle fixing mechanism, and the upper surface of each positioning block 16 is provided with a part conforming groove, and the upper end of the part conforming groove is provided with a tube type fixing mechanism.

[0039] Each of the main nozzle fixing mechanisms 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 equipped 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 presses the corresponding washer 11. The main nozzle is tightened by the fixing nut 12, which is easy to operate and disassemble, and the labor intensity of the operator is low. Since the welding positions of the parts are not the same structure, 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 tube-type fixing mechanisms includes a pressing plate 8, a pressing plate nut 9 and a threaded rod 10; one end of the horizontally arranged pressing plate 8 is hinged to one end of the upper surface of the positioning block 16 through a corresponding cylindrical pin, and the other end of the pressing plate 8 is sleeved on the outer side 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 through a corresponding cylindrical pin, and the upper end of the threaded rod 10 is threadedly screwed to the pressing plate nut 9, and the pressing plate nut 9 is used to press the pressing plate 8. The tube type is pressed by a pressing plate 8 that follows the shape to prevent the tube type from being deformed, and the pressing part structure is a cylindrical pin, a pressing plate 8, a pressing plate nut 9, and a threaded rod 10. After the pressing plate nut 9 is removed, the pressing plate 8 and the threaded rod 10 can be rotated outward to avoid interference.

[0041] A method for using a spot welding fixture before ring welding for segment 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 into corresponding supports 2 respectively and pre-tighten them with corresponding fixing nuts 12;

[0044] S2: All the tubes are respectively installed into the corresponding part-adapting grooves of the positioning block 16, so that the two ends of each tube are respectively connected to the corresponding main nozzle, and the corresponding pressing plate nut 9 and pressing plate 8 are used for pre-clamping;

[0045] S3: Adjust the connection state 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, so that the structure is completely fixed;

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

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

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

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

[0051] S9: Spot welding and fixing welding position B, welding position D, welding position F and welding position H;

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

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

[0054] S12: Spot welding the welding position K;

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

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

[0057] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description 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 may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A spot welding fixture for segmental welding, characterized in that: The invention comprises a bottom plate (1), a support (2), a positioning block (16), a main nozzle fixing mechanism and a tube type fixing mechanism; the upper end of the bottom plate (1) is fixed with a plurality of supports (2) and positioning blocks (16) arranged alternately one by one in sequence along the direction of the parts, the upper end of each support (2) is provided with a parts insertion hole and a main nozzle fixing mechanism, the upper surface of each positioning block (16) is provided with a parts-adaptive groove, and the upper end of the parts-adaptive groove is provided with a tube type fixing mechanism.

2. The spot welding fixture before girth welding for segment welding according to claim 1 is characterized in that: Each of the main nozzle fixing mechanisms comprises 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 provided with a washer (11); the top end of the positioning shaft (13) and the top end of the angular shaft (14) are respectively threadedly connected to the corresponding fixing nut (12); and the fixing nut (12) respectively presses the corresponding washer (11).

3. The pre-spot welding fixture for girth welding for segment 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 outer side of the middle part 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).

4. A method for using the pre-spot welding fixture for segmental welding according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: S1: Install all main nozzles into corresponding supports (2) respectively and pre-tighten them using corresponding fixing nuts (12); S2: All the tubes are respectively installed into the corresponding part-adapting grooves of the positioning blocks (16), so that both ends of each tube are respectively connected to the corresponding main nozzles, and are pre-clamped using the corresponding pressure plate nuts (9) and pressure plates (8); S3: Adjust the connection state 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 to fix welding position A, welding position C, welding position E, welding position G and welding position J; S6: Remove all parts and perform ring welding on the spot welding positions described in S5; S7: removing the positioning block (16) from the base plate (1); S8: re-fix and clamp all parts on the support (2); S9: Spot-welding and fixing welding position B, welding position D, welding position F and welding position H; S10: Remove all parts and perform ring welding on the spot welding positions described in S9; S11: re-fix and clamp all parts on the support (2); S12: Spot welding the welding position K; S13: After all parts are removed, circumferential welding is performed on welding position K.

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