Fixing fixture and welding method for clamp spot welding

Abstract

The present invention provides a fixing fixture and welding method for clamp spot welding, comprising a positioning block and a clamping block, wherein the positioning block is provided with a positioning groove and a positioning hole, and the positioning hole is connected to the positioning groove; an opening is formed at one end of the positioning groove, and an end baffle is provided at the other end of the positioning groove, the positioning groove accommodates a steel strip, and one end of the steel strip is inserted into the end baffle, the clamping block and the positioning block are detachably fastened and cooperate to clamp the steel strip; a second baffle is also provided on the positioning block, and the support is detachably fastened to the second baffle, and the welding surface of the support extends from the positioning hole to the positioning groove and fits with the steel strip. By tightening the steel strip and the support, there is no gap between the products after assembly, and splashing is avoided. At the same time, test pieces are used to verify the process parameters, thereby ensuring the stability of the welding parameters and the welding equipment, and improving the stability and consistency of the product welding quality. At the same time, the two parts are effectively fixed, and only one person is required to complete the welding of the product, which has a simple structure, convenient operation, and is fast.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary welding devices, and in particular to a fixing fixture and a welding method for clamp spot welding. Background Art

[0002] The cabin of aerospace products is fixed with clamps, which are assembled in the grooves on the surface of the cabin. Figure 1 As shown, the clamp consists of a steel strip, a support and a stud bolt. When in use, the stud bolt is inserted into the threaded hole of the support and the tightness is controlled by the stud bolt.

[0003] Currently, clamp assembly requires high alignment accuracy for the threaded holes in the supports at both ends of the clamp, as well as the accuracy of the supports' same-side and circumferential offsets relative to the center of the steel strip. Improper assembly can cause the steel strip to twist during stud assembly. Furthermore, high quality is required at the connection between the support and the steel strip. The steel strip and support are formed using resistance spot welding. If the welding gap and process parameters are not appropriately selected, the resistance of the lap joint increases, leading to spatter and poor weld quality, which can easily cause product failure.

[0004] The existing Chinese patent application document with publication number CN215091312U discloses a clamp ear welding positioning tool, including a base, a platform and an adjustment component. A welding component is installed on the base, and a platform is provided on the base. The platform is used to place the clamp ear. A limit part is provided on the platform. The limit part limits the position of the welding part. The adjustment component is provided between the base and the platform. The adjustment component is used to move the platform relative to the base, so that the welding component is aligned with the welding position of the clamp ear in the limit part for welding.

[0005] The welding positioning tooling in the prior art is difficult to ensure welding accuracy and consistency of clamp assembly, and there is room for improvement. Summary of the Invention

[0006] In view of the defects in the prior art, the object of the present invention is to provide a fixing fixture and a welding method for clamp spot welding.

[0007] According to the present invention, a fixing tool for spot welding of a clamp is provided, comprising a positioning block and a clamping block, wherein the positioning block is provided with a positioning groove and a positioning hole, and the positioning hole is connected to the positioning groove; an opening is formed at one end of the positioning groove, and an end face baffle is provided at the other end of the positioning groove, the positioning groove accommodates a steel strip, and one end of the steel strip is inserted into the end face baffle, the clamping block and the positioning block are detachably fastened and cooperate to clamp the steel strip; a second baffle is also provided on the positioning block, the support is detachably fastened and connected to the second baffle, and the welding surface of the support extends from the positioning hole to the positioning groove and fits the steel strip.

[0008] Preferably, the width of the positioning groove is 0.1 mm, which is a tolerance on the width of the steel strip; and the depth of the positioning groove is 0.1 mm less than the thickness of the steel strip.

[0009] Preferably, the end baffle and the positioning groove are perpendicular to each other, and a blocking groove is provided on the end baffle, the blocking groove is connected to the positioning groove, and the thickness of the blocking groove allows the steel strip to be inserted.

[0010] Preferably, the second baffle is perpendicular to the positioning groove, the end baffle is perpendicular to the positioning groove, and the contact surface between the second baffle and the support and the side surface of the end baffle close to the positioning groove are coplanar.

[0011] Preferably, the dimensional accuracy error of the width and end surface verticality of the steel strip and the support is no more than 0.1 mm.

[0012] Preferably, a bolt through hole is provided on the second baffle, the vertical surface of the support is in contact with the second baffle, and a vertical threaded hole is provided on the vertical surface of the support. The bolt is screwed into the bolt through hole and the vertical threaded hole in sequence, and the bolt does not protrude from the end face of the vertical threaded hole.

[0013] Preferably, the positioning block is provided with a bolt hole, and the pressing block is provided with a through hole, and the bolt passes through the through hole and is screwed into the bolt hole.

[0014] According to the present invention, a welding method for spot welding of a clamp is provided, and the welding method comprises the following steps:

[0015] S1. Pre-treat the steel strip and support;

[0016] S2. Install one end of the pretreated steel strip and the support into the fixed tooling;

[0017] S3. Use a test piece with the same thickness as the product for welding;

[0018] S4. Install the other end of the pretreated steel strip and the support into the fixed tooling;

[0019] S5. Use a test piece with the same thickness as the product for welding;

[0020] S6. Remove fixed tooling;

[0021] S7, grinding the protrusions of the welding points;

[0022] S8. Bend the steel strip and connect the two supports with stud bolts.

[0023] Preferably, in step S1, the steel strip and the support are pickled for 30-90 seconds. After pickling, the acid remaining on the parts is washed with clean water, and the parts are blown dry with compressed air.

[0024] Preferably, for step S2, first place the steel strip in the positioning groove, insert the end face of the steel strip into the end face baffle, use the clamping block to press the steel strip, and at the same time ensure that the through hole on the clamping block is aligned with the bolt hole on the positioning block, screw in the fastener and tighten it, and the fastener thread is left-handed; then, flip the tooling to the other side, place the support into the positioning hole of the positioning block, ensure that the vertical surface of the support is close to the second baffle, and screw the bolt from the back of the second baffle through the bolt through hole and into the bolt hole of the support.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. This invention secures the steel band and the support tightly, eliminating gaps between the products after assembly and preventing spatter. Test pieces are used to verify process parameters, ensuring the stability of welding parameters and equipment, and improving the stability and consistency of product welding quality. The effective fixation of the two parts allows only one person to complete the welding of the product. The simple structure and easy operation ensure rapid and accurate clamping and positioning, ensuring the consistency of the assembly of the clamp steel band and the support, ensuring the position accuracy of the support, and improving processing efficiency, effectively ensuring product quality and progress.

[0027] 2. The present invention controls the precision requirements of the assembly position by setting notches and blocks on the tooling and adopting an integrated processing method, thereby ensuring the same-side offset and circumferential offset requirements of the clamp steel strip and the support.

[0028] 3. The present invention facilitates the installation and removal of parts by switching the fastener between the tightened and loosened states. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0030] Figure 1 This is a schematic diagram mainly showing the overall structure of the clamp product of the present invention;

[0031] Figure 2 This is a schematic diagram of the assembly of the support and the steel belt in the welding state of the product of the present invention;

[0032] Figure 3 This is the main view of the three-dimensional structure of the fixed tooling of the present invention;

[0033] Figure 4 This is a top view of the three-dimensional structure of the fixed tooling mainly embodied in the present invention;

[0034] Figure 5 This is a schematic diagram of the three-dimensional structure of the positioning block mainly embodied in the present invention;

[0035] Figure 6This is a schematic diagram of the three-dimensional structure of the compression block mainly embodied in the present invention.

[0036] As shown in the figure:

[0037] Steel belt 1 end baffle 32

[0038] Steel belt side 11 positioning hole 33

[0039] Steel strip end face 12 Second baffle 34

[0040] Support 2 Bolt through hole 35

[0041] Support side 21 bolt hole 36

[0042] Support end face 22 Pressing block 4

[0043] Positioning block 3 Pressing block end face 41

[0044] Positioning groove 31 through hole 42 DETAILED DESCRIPTION

[0045] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0046] Example 1

[0047] The clamps in this application are as follows Figure 1 and Figure 2 The above-mentioned structure includes a steel strip 1 and a support 2. The support 2 is distributed on both sides of the length direction of the steel strip 1. The distance deviation between the support side 21 and the steel strip side 11 is required to be no more than 0.2 mm, and the distance deviation between the support end face 22 and the steel strip end face 12 is required to be no more than 0.2 mm.

[0048] like Figure 3 、 Figure 4 、 Figure 5 as well as Figure 6As shown, a fixing fixture and welding method for clamp spot welding provided by the present invention includes a positioning block 3 and a clamping block 4. The positioning block 3 is provided with a positioning groove 31 and a positioning hole 33, and the positioning hole 33 is connected to the positioning groove 31. One end of the positioning groove 31 forms an opening, and the other end of the positioning groove 31 is provided with an end baffle 32. The positioning groove 31 accommodates the steel strip 1, and one end of the steel strip 1 passes into the end baffle 32. The clamping block 4 is detachably fastened to the positioning block 3 and cooperates to clamp the steel strip 1. The positioning block 3 is also provided with a second baffle 34. The support 2 is detachably fastened to the second baffle 34, and the welding surface of the support 2 extends from the positioning hole 33 to the positioning groove 31 and is in contact with the steel strip 1.

[0049] Specifically, the positioning block 3 includes a positioning groove 31, an end baffle 32, a positioning hole 33, a second baffle 34, a bolt through hole 35, and a bolt hole 36. The positioning groove 31, the end baffle 32, the positioning hole 33, the second baffle 34, the bolt through hole 35, and the bolt hole 36 are integrally machined parts, with a positioning accuracy of no more than 0.1 mm.

[0050] The positioning groove 31 and end plate 32 are used to secure the position of the steel strip 1. The width of the positioning groove 31 is within a 0.1mm tolerance on the width of the steel strip 1; its depth is 0.1mm less than the thickness of the steel strip 1. The end plate 32 and positioning groove 31 are perpendicular to each other. A blocking slot is provided on the end plate 32, connecting to the positioning groove 31 and thick enough to allow the steel strip 1 to be inserted. Furthermore, the width and perpendicularity of the clamp steel strip 1 and the support 2 must be within 0.1mm to ensure accurate assembly of the steel strip 1.

[0051] More specifically, the steel strip 1 is placed in the positioning slot 31, with the end face 12 of the steel strip inserted into the blocking slot of the end face baffle 32, ensuring that the flat surface, end face, and side face of the steel strip 1 are in close contact with the fixture. The strip is then secured with a clamping block 4. The positioning block 3 is provided with bolt holes 36, and the clamping block 4 is provided with through holes 42. Bolts pass through through holes 42 and are threaded into bolt holes 36. The clamping block end face 41 presses against the steel strip 1, and bolts are inserted into through holes 42 and secured to bolt holes 36.

[0052] The positioning hole 33 and the second baffle 34 are used to define the position of the support 2. The second baffle 34 is perpendicular to the positioning groove 31, and the end baffle 32 is perpendicular to the positioning groove 31. The contact surface between the second baffle 34 and the support 2 and the side surface of the end baffle 32 close to the positioning groove 31 are coplanar. A bolt through hole 35 is provided on the second baffle 34. The vertical surface of the support 2 is in contact with the second baffle 34. The vertical surface of the support 2 is provided with a vertical threaded hole. The bolt is screwed into the bolt through hole 35 and the vertical threaded hole in sequence, and the bolt does not protrude from the end surface of the vertical threaded hole. In actual installation, the support 2 is placed in the positioning hole 33, and the vertical surface of the support 2 is close to the second baffle 34. Then, the bolt is passed through the bolt through hole 35 and the vertical threaded hole of the support 2 to fix it. Note that the bolt cannot protrude from the end surface of the vertical threaded hole of the support 2. Tighten it with the nut to ensure the consistency of the position of the support 2.

[0053] This method ensures the positional accuracy of both the support 2 and the steel strip 1, while also ensuring that the bottom surface of the support 2 is in close contact with the upper surface of the clamp steel strip 1. This ensures that there is no gap during the spot welding process, avoids defects such as spot welding spatter, and ensures reliable product welding quality. Furthermore, after the support 2 is fixed, the welding surface of the support 2 should be higher than the horizontal plane of the tooling to facilitate spot welding operations.

[0054] Specifically, the second baffle 34 serves as the reference plane of the vertical surface of the support 2, the center of the bolt through hole 35 coincides with the center of the vertical threaded hole, and the end baffle 32 serves as the reference plane of the steel strip end surface 12. Through tooling design, the horizontal distance between the end baffle 32 and the baffle of the support 2 is fixed, that is, by setting the depth of the blocking groove, to ensure the consistency of the distance between the vertical surface of the steel strip 1 and the support 2.

[0055] The present invention also provides a welding method for spot welding a clamp, the welding method comprising the following steps:

[0056] S1. Pre-treat the steel strip 1 and the support 2. Specifically, with respect to step S1, pickling is performed on the steel strip 1 and the support 2, wherein the pickling time is 30-90 seconds, and after pickling, the acid solution remaining on the parts is washed off with clean water, and the parts are blown dry with compressed air.

[0057] S2. Install one end of the pre-treated steel strip 1 and the support 2 into the fixed fixture. Specifically, first place the steel strip 1 in the positioning groove 31, insert the steel strip end face 12 into the end face baffle 32, use the clamping block 4 to press the steel strip 1, and at the same time ensure that the through hole 42 on the clamping block 4 is aligned with the bolt hole 36 on the positioning block 3, screw in the fastener and tighten it, with the fastener thread direction being left-handed; then, flip the fixture to the other side, place the support 2 into the positioning hole 33 of the positioning block 3, ensure that the vertical surface of the support 2 is close to the second baffle 34, and screw the bolt from the back of the second baffle 34 through the through hole 42 and into the bolt hole 36 of the support 2.

[0058] S3. Use a test piece of the same thickness as the product for welding. Specifically, perform spot welding on a fixed spot welding machine with a welding pressure of 0.25-0.3 MPa, a welding current of 24-28 kA, and a hold time of 40 ms. Remove the test piece, ensuring that any remaining welds or holes in the sheet are no less than 2.8 mm. Use the same parameters as the test piece to weld the product, for a total of two welds.

[0059] S4: Install the other end of the pre-treated steel strip 1 and the support 2 into the fixed fixture. The installation steps are the same as step S2.

[0060] S5. Use a test piece with the same thickness as the product for welding, using the same welding parameters as in step S3.

[0061] S6. Remove the fixed tooling.

[0062] S7. Grind the protrusions of the solder joints. Use a diamond grinding head to grind the protrusions of the solder joints.

[0063] S8. Bend the steel strip 1 and connect the two supports 2 with stud bolts.

[0064] It is important to note that the supports 2 at both ends of the steel band of this application can be welded simultaneously or separately. The technical solution of this application, by providing notches and blocks on the tooling and adopting an integrated processing method, can ensure that the same-side offset and circumferential offset requirements of both the steel band 1 and the supports 2 of the clamp are met.

[0065] The switching of fasteners between tightened and loosened states facilitates the installation and removal of parts.

[0066] The support 2 and the steel strip 1 can be effectively fixed by the limited groove and fasteners, facilitating the welding of the clamp. At the same time, the two parts are effectively fixed, and only one person is required to complete the welding of the product. The structure is simple and easy to operate, ensuring fast and accurate clamping and positioning, ensuring the consistency of the assembly of the clamp steel strip 1 and the support 2, ensuring the position accuracy of the support 2, and improving processing efficiency, effectively ensuring product quality and progress. The clamp spot welding method fixes the steel strip 1 and the support 2 tightly, leaving no gap between the products after assembly, avoiding spatter. At the same time, the process parameters are verified by test pieces, ensuring the stability of the welding parameters and welding equipment, which can improve the stability and consistency of the product welding quality.

[0067] Variation Example 1

[0068] Based on the first embodiment, the present invention further provides a welding method for clamp spot welding, comprising:

[0069] Step 1, pickling the steel strip 1 and the support 2;

[0070] The pickling time is 30-90s. After pickling, the acid remaining on the parts is washed off with clean water, and the parts are blown dry with compressed air.

[0071] Step 2: Place the steel strip 1 in the positioning groove 31 of the steel strip 1, with the end face 12 of the steel strip in contact with the baffle of the end face 12 of the steel strip, press the steel strip 1 with the pressing block 4, and ensure that the through hole 42 on the pressing block 4 is aligned with the threaded hole on the positioning block 3, screw in the fastener and tighten it, with the fastener thread direction being left-handed;

[0072] Step 3, flip the tooling to the other side, place the support 2 into the positioning hole 33, ensure that the vertical surface of the support 2 is close to the second baffle 34, screw the bolt from the back of the second baffle 34 through the bolt hole 35 and screw it into the vertical threaded hole of the support 2.

[0073] Step 4: Use a test piece with the same thickness as the product for welding. The test piece is welded on a fixed spot welding device with a welding pressure of 0.25 MPa, a welding current of 24 KA, and a holding time of 40 ms.

[0074] Step 5: Tear off the test piece. The residual solder joints or holes in the sheet must be no less than 2.8 mm.

[0075] Step 6: Weld the product using the same parameters as the test piece, welding two points in total.

[0076] Step 7: Remove the spot welding fixture.

[0077] Step 8: Use a diamond grinding head to grind the protrusions of the solder joints.

[0078] Variation 2

[0079] Based on the first embodiment, the present invention further provides a welding method for clamp spot welding, comprising:

[0080] Step 1, pickling the steel strip 1 and the support 2;

[0081] The pickling time is 30-90s. After pickling, the acid remaining on the parts is washed off with clean water, and the parts are blown dry with compressed air.

[0082] Step 2, place the steel strip 1 in the positioning groove 31 of the steel strip 1, and the end face 12 of the steel strip abuts against the baffle of the end face 12 of the steel strip, press the steel strip 1 with the clamping block 4, and at the same time ensure that the through hole 42 on the clamping block 4 is aligned with the threaded hole on the positioning block 3, screw in the fastener and tighten it, and the fastener thread is left-handed.

[0083] Step 3, flip the tooling to the other side, place the support 2 into the positioning hole 33, ensure that the vertical surface of the support 2 is close to the second baffle 34, screw the bolt from the back of the second baffle 34 through the bolt hole 35 and screw it into the vertical threaded hole of the support 2.

[0084] Step 4: Use a test piece with the same thickness as the product for welding. The test piece is welded on a fixed spot welding device with a welding pressure of 0.3 MPa, a welding current of 28 KA, and a holding time of 40 ms.

[0085] Step 5: Tear off the test piece. The residual solder joints or holes in the sheet must be no less than 2.8 mm.

[0086] Step 6: Weld the product using the same parameters as the test piece, welding two points in total.

[0087] Step 7: Remove the spot welding fixture.

[0088] Step 8: Use a diamond grinding head to grind the protrusions of the solder joints.

[0089] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0090] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A fixture for spot welding of clamps, characterized in that: It comprises a positioning block (3) and a pressing block (4), wherein the positioning block (3) is provided with a positioning groove (31) and a positioning hole (33), and the positioning hole (33) is communicated with the positioning groove (31); One end of the positioning groove (31) forms an opening, and the other end of the positioning groove (31) is provided with an end face baffle (32). The positioning groove (31) accommodates the steel strip (1), and one end of the steel strip (1) passes through the end face baffle (32). The pressing block (4) and the positioning block (3) are detachably fastened and connected and cooperate to clamp the steel strip (1). A second baffle (34) is also provided on the positioning block (3), the support (2) and the second baffle (34) are detachably fastened together, and the welding surface of the support (2) extends from the positioning hole (33) to the positioning groove (31) and fits with the steel strip (1).

2. The fixing fixture for clamp spot welding according to claim 1, characterized in that: The width of the positioning groove (31) is 0.1 mm, which is a tolerance of the width of the steel strip (1); The depth of the positioning groove (31) is less than the thickness of the steel strip (1) by 0.1 mm.

3. The fixing fixture for clamp spot welding according to claim 1, characterized in that: The end baffle (32) and the positioning groove (31) are perpendicular to each other. A blocking groove is provided on the end baffle (32), and the blocking groove is connected to the positioning groove (31). The thickness of the blocking groove allows the steel strip (1) to be inserted.

4. The fixing fixture and welding method for clamp spot welding according to claim 1, characterized in that: The second baffle (34) is perpendicular to the positioning groove (31), the end baffle (32) is perpendicular to the positioning groove (31), and the contact surface between the second baffle (34) and the support (2) and the side surface of the end baffle (32) close to the positioning groove (31) are coplanar.

5. The fixing fixture for clamp spot welding according to claim 1, characterized in that: The dimensional accuracy errors of the width and end face verticality of the steel strip (1) and the support (2) are no more than 0.1 mm.

6. The fixing fixture for clamp spot welding according to claim 1, characterized in that: The second baffle (34) is provided with a bolt through hole (35), the vertical surface of the support (2) is in contact with the second baffle (34), the vertical surface of the support (2) is provided with a vertical threaded hole, the bolt is screwed into the bolt through hole (35) and the vertical threaded hole in sequence, and the bolt does not protrude from the end surface of the vertical threaded hole.

7. The fixing fixture for clamp spot welding according to claim 1, characterized in that: The positioning block (3) is provided with a bolt hole (36), and the pressing block (4) is provided with a through hole (42). The bolt passes through the through hole (42) and is screwed into the bolt hole (36).

8. A welding method for spot welding of a clamp, characterized in that: Using the fixing fixture for clamp spot welding according to any one of claims 1 to 7, the welding method includes the following steps: S1, pre-treating the steel strip (1) and the support (2); S2, placing one end of the pre-treated steel strip (1) and the support (2) into a fixed fixture; S3. Use a test piece with the same thickness as the product for welding; S4, placing the other end of the pretreated steel strip (1) and the support (2) into a fixed fixture; S5. Use a test piece with the same thickness as the product for welding; S6. Remove fixed tooling; S7, grinding the protrusions of the welding points; S8, bend the steel strip (1) and connect the two supports (2) using stud bolts.

9. The welding method for clamp spot welding according to claim 8, characterized in that: In step S1, the steel strip (1) and the support (2) are pickled, wherein the pickling time is 30-90 seconds. After pickling, the acid liquid remaining on the parts is washed off with clean water, and the parts are blown dry with compressed air.

10. The method for spot welding a clamp according to claim 8, wherein: With respect to step S2, firstly, the steel strip (1) is placed in the positioning groove (31), the end face (12) of the steel strip is inserted into the end face baffle (32), and the steel strip (1) is pressed by the pressing block (4), while ensuring that the through hole (42) on the pressing block (4) is aligned with the bolt hole (36) on the positioning block (3), and the fastener is screwed in and tightened, and the thread of the fastener is left-handed; Afterwards, flip the tooling to the other side, place the support (2) into the positioning hole (33) of the positioning block (3), ensure that the vertical surface of the support (2) is close to the second baffle (34), and screw the bolt from the back of the second baffle (34) through the bolt through hole (35) and screw it into the bolt hole (36) of the support (2).

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