Flat wire welding workpiece tension test fixture and test method

Abstract

The invention provides a flat wire welding workpiece tension test fixture and test method.The flat wire welding workpiece tension test fixture comprises an upper supporting plate, a lower supporting plate and a connecting piece, the lower supporting plate is provided with a structural hole for the tail of a flat wire to penetrate through and stretch out and a mounting plane perpendicular to the axis of the structural hole and used for being attached to the structural plane, and the connecting piece is connected with the mounting plane. The lower supporting plate is detachably and fixedly connected with the upper supporting plate through the connecting piece, the mounting plane is located between the lower supporting plate and the upper supporting plate, and a mounting space for containing the part, close to the upper supporting plate and extending out of the structural hole, of the flat wire welding workpiece is formed between the upper supporting plate and the lower supporting plate. According to the invention, the accuracy of the tension test result of the flat wire welding workpiece can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of flat wire welding workpiece tension testing, and in particular to a flat wire welding workpiece tension testing fixture and a testing method. Background Art

[0002] The current drive for higher-quality motors in new energy vehicles requires continuous improvement in manufacturing processes. Existing new energy motor winding ends—the ends of flat wires—are typically welded in straight sections to other flat wires, clip-on copper bars, or round copper rods. The quality of these straight sections determines the performance and lifespan of the motor. Therefore, testing the welding quality of these straight sections is crucial to determining whether they meet the required quality.

[0003] In the prior art, during the welding quality test of flat wire welding workpieces, the tensile force between the mutually welded flat wires and other flat wires, snap copper bars or round copper rods is tested, and the legs of the flat wire of the flat wire welding workpiece, or the ends of the snap copper bars or the ends of the round copper rods are pulled respectively by a tensile testing machine. Since the legs of the flat wire, or the ends of the snap copper bars or the ends of the round copper rods are at a certain distance from the straight section of the flat wire welding workpiece when being pulled, and the direction of the pulling force has a certain angle with the straight section, a certain force arm is formed relative to the straight section by the pulling point, which affects the accuracy of the tensile test results of the straight section.

[0004] Therefore, it is necessary to improve the existing flat wire welding workpiece tensile test fixture and test method to improve the accuracy of the tensile test results of the flat wire welding workpiece. Summary of the Invention

[0005] The object of the present invention is to provide a flat wire welding workpiece tensile testing fixture and testing method, so as to solve the problem of low testing accuracy of the existing flat wire welding workpiece tensile testing fixture and testing method.

[0006] In order to solve the above technical problems, the present invention provides a flat wire welding workpiece tensile testing fixture, which includes an upper support plate, a lower support plate and a connecting piece. The lower support plate has a structural hole for the tail of the flat wire to pass through and extend out, and an installation plane perpendicular to the axis of the structural hole for fitting with the structural plane. The lower support plate is detachably fixed to the upper support plate through the connecting piece. The installation plane is located between the lower support plate and the upper support plate, and an installation space is formed between the upper support plate and the lower support plate to accommodate the part of the flat wire welding workpiece close to the upper support plate and extending out of the structural hole.

[0007] Optionally, the structural hole is located at the center of the lower supporting plate.

[0008] Optionally, an intermediate piece for connecting the upper support plate and the tensile machine is also included.

[0009] Optionally, a first threaded hole is formed on the upper supporting plate, and the intermediate piece has a threaded portion and a connecting portion connected to the threaded portion and used for connecting to a tensile testing machine, and the threaded portion is threadedly connected to the first threaded hole.

[0010] Optionally, the first threaded hole is located at the center of the upper supporting plate.

[0011] Optionally, the upper support plate includes a support plate and a boss, and the center line of the boss coincides with the center line of the support plate.

[0012] Optionally, the connecting member is a screw.

[0013] Optionally, the welding part may be a flat wire, a snap-on copper busbar or a round copper rod.

[0014] The present invention also provides a method for performing a tensile test on a flat wire welding workpiece using the above-mentioned flat wire welding workpiece tensile testing fixture, comprising: making a flat wire welding workpiece, the flat wire welding workpiece comprising a flat wire and a welding part, the flat wire being straight, the welding part and the part of the flat wire close to the head of the flat wire being welded along the length direction of the flat wire, and the end of the welding part close to the tail of the flat wire having a structural plane perpendicular to the length direction of the flat wire; passing the tail of the flat wire of the flat wire welding workpiece through the structural hole of the lower support plate, and making the installation plane on the lower support plate perpendicular to the axis of the structural hole fit the structural plane; connecting the upper support plate to the lower support plate through a connecting part, and making the part of the flat wire welding workpiece that does not pass through the structural hole be located between the upper support plate and the lower support plate; pulling the tail of the flat wire and the upper support plate through a tensile testing machine to test the welding quality of the flat wire and the welding part.

[0015] Optionally, the method further includes connecting an intermediate piece to the upper support plate before the tail of the flat wire and the upper support plate are pulled through the tensile machine, and the upper support plate is connected to the tensile machine through the intermediate piece.

[0016] The present invention provides a flat wire welding workpiece tensile testing fixture and testing method, which has the following beneficial effects: When a flat wire welding workpiece tensile test fixture is used to perform a flat wire welding workpiece tensile test, since the lower support plate has a structural hole for the tail of the flat wire to pass through and extend out, and a mounting plane perpendicular to the axis of the structural hole for fitting with the structural plane, the lower support plate is detachably fixedly connected to the upper support plate through the connecting piece, and the mounting plane is located between the lower support plate and the upper support plate, and an installation space is formed between the upper support plate and the lower support plate to accommodate the portion of the flat wire welding workpiece that is close to the upper support plate and extends out of the structural hole. Therefore, when the flat wire welding workpiece is installed on the fixture, that is, the flat wire After the tail of the flat wire of the welding workpiece passes through the structural hole and extends out of the lower support plate, the part of the flat wire welding workpiece that does not pass through the structural hole, that is, the part that extends out of the structural hole and is located between the upper support plate and the lower support plate can be accommodated between the upper support plate and the lower support plate, and the structural plane is in contact with the mounting plane. In this way, when the upper support plate and the tail of the flat wire are pulled respectively, the force acting on the flat wire welding workpiece to separate the flat wire and the welded part is parallel to the weld, that is, the force to separate the flat wire and the welded part is parallel to the straight line segment. Therefore, there is no force arm, which can improve the accuracy of the tensile test of the flat wire welding workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a flat wire welding workpiece tensile test fixture during testing according to an embodiment of the present invention; Figure 2 2 is a schematic structural diagram of a flat wire welding workpiece tensile testing fixture according to an embodiment of the present invention; Figure 3 2 is a front view of a flat wire welding workpiece tensile testing fixture according to an embodiment of the present invention; Figure 4 2 is a schematic structural diagram of an upper support plate of a flat wire welding workpiece tensile testing fixture according to an embodiment of the present invention; Figure 5 2 is a schematic structural diagram of a lower support plate of a flat wire welding workpiece tensile testing fixture according to an embodiment of the present invention; Figure 6 This is a schematic structural diagram of a flat wire welding workpiece according to an embodiment of the present invention; Figure 7 This is a schematic structural diagram of another flat wire welding workpiece according to an embodiment of the present invention; Figure 8 This is a structural schematic diagram of another flat wire welding workpiece in an embodiment of the invention.

[0018] Description of reference numerals: 100-flat wire welding workpiece; 110-flat wire; 120-welding part; 121-structural plane; 200-upper support plate; 210-first threaded hole; 220-support plate; 230-boss; 300-lower support plate; 310-structural hole; 320-mounting plane; 400-connecting piece; 500-middle piece. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0022] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0024] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0025] refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 , Figure 1 This is a schematic structural diagram of a flat wire welding workpiece tensile test fixture during testing according to an embodiment of the present invention. Figure 2 : is a schematic structural diagram of a flat wire welding workpiece tensile testing fixture according to an embodiment of the present invention, Figure 3 1 is a front view of a tensile testing fixture for flat wire welding workpieces according to an embodiment of the present invention. Figure 4 2 is a schematic structural diagram of an upper support plate 200 of a flat wire welding workpiece tensile test fixture according to an embodiment of the present invention. Figure 5 3 is a structural diagram of the lower support plate 300 of the flat wire welding workpiece tensile test fixture in an embodiment of the present invention. Figure 6 1 is a schematic structural diagram of a flat wire welding workpiece 100 according to an embodiment of the present invention. Figure 7 1 is a schematic structural diagram of another flat wire welding workpiece 100 according to an embodiment of the present invention. Figure 8 It is a structural schematic diagram of another flat wire welding workpiece 100 in an embodiment of the invention. This embodiment provides a flat wire welding workpiece tensile test fixture, including an upper support plate 200, a lower support plate 300 and a connecting piece 400. The lower support plate 300 has a structural hole 310 for the tail of the flat wire 110 to pass through and extend out, and a mounting plane 320 perpendicular to the axis of the structural hole 310 for fitting with the structural plane. The lower support plate 300 is detachably fixedly connected to the upper support plate 200 through the connecting piece 400. The mounting plane 320 is located between the lower support plate 300 and the upper support plate 200, and an installation space is formed between the upper support plate 200 and the lower support plate 300 to accommodate the part of the flat wire welding workpiece 100 close to the upper support plate 200 and extending out of the structural hole 310.

[0026] The flat wire welding workpiece 100 includes a flat wire 110 and a welding part 120. The flat wire 110 is straight. The welding part 120 is welded to the part of the flat wire 110 close to the head of the flat wire 110 along the length direction of the flat wire 110, and the end of the welding part 120 close to the tail of the flat wire 110 has a structural plane perpendicular to the length direction of the flat wire 110. Since the flat wire welding workpiece 100 includes a flat wire 110 and a welding piece 120, the flat wire 110 is in a straight line shape, the welding piece 120 is welded to the portion of the flat wire 110 near the head of the flat wire 110 along the length direction of the flat wire 110, and the end of the welding piece 120 near the tail of the flat wire 110 has a structural plane perpendicular to the length direction of the flat wire 110, that is, the weld between the flat wire 110 and the welding piece 120 is along the length direction of the flat wire 110, the welding portion of the flat wire 110 is a straight line segment, the structural plane of the welding piece 120 is perpendicular to the weld, and the length direction of the flat wire 110 is parallel to the weld; When a flat wire welding workpiece tensile test fixture is used to perform a flat wire welding workpiece tensile test, since the lower support plate 300 has a structural hole 310 for the tail of the flat wire 110 to pass through and extend out, and a mounting plane 320 perpendicular to the axis of the structural hole 310 for fitting with the structural plane, the lower support plate 300 is detachably fixedly connected to the upper support plate 200 through the connecting piece 400, and the mounting plane 320 is located between the lower support plate 300 and the upper support plate 200, and an installation space is formed between the upper support plate 200 and the lower support plate 300 to accommodate the portion of the flat wire welding workpiece 100 that is close to the upper support plate 200 and extends out of the structural hole 310. Therefore, when the flat wire welding workpiece 100 is installed on the fixture, that is, the flat wire welding workpiece After the tail of the flat wire 110 of 100 passes through the structural hole 310 and extends out of the lower support plate 300, the portion of the flat wire welding workpiece 100 that does not pass through the structural hole 310, that is, the portion that extends out of the structural hole 310 and is located between the upper support plate 200 and the lower support plate 300 can be accommodated between the upper support plate 200 and the lower support plate 300, and the structural plane is in contact with the mounting plane 320. In this way, when the upper support plate 200 and the tail of the flat wire 110 are pulled respectively, the force acting on the flat wire welding workpiece 100 to separate the flat wire 110 and the weldment 120 is parallel to the weld, that is, the force to separate the flat wire 110 and the weldment 120 is parallel to the straight line segment. Therefore, there is no force arm, which can improve the accuracy of the tensile test of the flat wire welding workpiece 100.

[0027] Preferably, the welded part is in a straight line or block shape, so that the shape of the weld seam of the welded part can be adapted to the shape of the welded part.

[0028] Preferably, the length and width of the structural hole are larger than the length and width of the flat wire by 0.3-0.5 mm.

[0029] The structural hole 310 is located at the center of the lower supporting plate 300. This can make the clamp more stable.

[0030] The flat wire welding workpiece tensile testing fixture further includes an intermediate piece 500 for connecting the upper support plate 200 and the tensile testing machine, so as to facilitate the connection between the fixture and the tensile testing machine.

[0031] A first threaded hole 210 is formed on the upper supporting plate 200 . The intermediate component 500 includes a threaded portion and a connection portion connected to the threaded portion for connection to a tensile testing machine. The threaded portion is threadedly connected to the first threaded hole 210 .

[0032] The first threaded hole 210 is located at the center of the upper supporting plate 200. In this way, the clamp can be made more stable.

[0033] Preferably, the upper support plate 200 includes a support plate 220 and a boss 230, and the center line of the boss 230 coincides with the center line of the support plate 220. In this way, the center of gravity of the upper support plate 200 is located on the center line of the boss 230, which can make the upper support plate 200 and the lower support plate 300 more stable, so that the angle between the pulling force acting on the flat wire welding workpiece and the weld tends to 0°, avoiding the fixture itself affecting the results of the tensile test.

[0034] Furthermore, the support plate 220 is a rectangular plate, and the boss 230 includes four structural ribs symmetrically distributed on the rectangular plate. In this way, the weight of the upper support plate 200 can be avoided to be too heavy, and the center of gravity of the upper support plate 200 can be raised.

[0035] The lower supporting plate 300 is a rectangular plate.

[0036] The connecting member 400 is a screw.

[0037] The welding member 120 may be a flat wire, a snap-on copper busbar, or a round copper rod.

[0038] Specifically, when the welding part 120 is a flat wire or a round copper rod, the length of the welding part can be less than 8 mm, the length and width of the flat wire are 2.8-4 mm, the weld length is less than 4 mm, and the distance between the structural plane and the weld is less than or equal to 4 mm.

[0039] The direction in which the tensile testing machine pulls the tail of the flat wire is parallel to the length direction of the flat wire, and the force is gradually increased from small to large until the welding point is broken.

[0040] This embodiment further provides a method for performing a tensile test on a flat wire welded workpiece using the flat wire welded workpiece tensile test fixture of the above embodiment, comprising: A flat wire welding workpiece 100 is manufactured. The flat wire welding workpiece 100 includes a flat wire 110 and a welding piece 120. The flat wire 110 is linear. The welding piece 120 is welded to a portion of the flat wire 110 near the head of the flat wire 110 along the length of the flat wire 110. An end of the welding piece 120 near the tail of the flat wire 110 has a structural plane 121 perpendicular to the length of the flat wire 110. Pass the tail of the flat wire 110 of the flat wire welding workpiece 100 through the structural hole 310 of the lower support plate 300, and make the installation plane 320 of the lower support plate 300 perpendicular to the axis of the structural hole 310 fit with the structural plane; Connect the upper support plate 200 to the lower support plate 300 via the connector 400, and position the portion of the flat wire welding workpiece 100 that is not inserted into the structural hole 310 between the upper support plate 200 and the lower support plate 300; The tail of the flat wire 110 and the upper supporting plate 200 are pulled by a tensile testing machine to test the welding quality of the flat wire 110 and the welding piece 120 .

[0041] Preferably, the method for tensile testing the flat wire welded workpiece 100 further includes connecting an intermediate piece 500 to the upper support plate 200 before pulling the tail of the flat wire 110 and the upper support plate 200 through the tensile machine, and the upper support plate 200 is connected to the tensile machine through the intermediate piece 500.

[0042] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A flat wire welding workpiece tensile test fixture, characterized in that: The flat wire welding workpiece tensile test fixture includes an upper support plate, a lower support plate and a connecting piece. The lower support plate has a structural hole for the tail of the flat wire to pass through and extend out, and a mounting plane perpendicular to the axis of the structural hole for fitting with the structural plane. The lower support plate is detachably fixed to the upper support plate through the connecting piece. The mounting plane is located between the lower support plate and the upper support plate, and an installation space is formed between the upper support plate and the lower support plate to accommodate the part of the flat wire welding workpiece close to the upper support plate and extending out of the structural hole.

2. The flat wire welding workpiece tensile testing fixture according to claim 1, characterized in that: The structural hole is located at the center of the lower supporting plate.

3. The flat wire welding workpiece tensile testing fixture according to claim 1, characterized in that: It also includes an intermediate piece for connecting the upper supporting plate and the tensile machine.

4. The flat wire welding workpiece tensile testing fixture according to claim 3, characterized in that: A first threaded hole is formed on the upper supporting plate, and the intermediate component comprises a threaded portion and a connecting portion connected to the threaded portion and used for connecting to a tensile testing machine, wherein the threaded portion is threadedly connected to the first threaded hole.

5. The flat wire welding workpiece tensile testing fixture according to claim 4, characterized in that: The first threaded hole is located at the center of the upper supporting plate.

6. The flat wire welding workpiece tensile testing fixture according to claim 1, characterized in that: The upper supporting plate includes a supporting plate and a boss, and the center line of the boss coincides with the center line of the supporting plate.

7. The flat wire welding workpiece tensile testing fixture according to claim 1, characterized in that: The connecting piece is a screw.

8. The flat wire welding workpiece tensile testing fixture according to claim 1, characterized in that: The welding piece may be a flat wire, a snap-on copper busbar or a round copper rod.

9. A method for performing a tensile test on a flat wire welding workpiece using the flat wire welding workpiece tensile test fixture according to any one of claims 1 to 8, characterized in that: include: Manufacturing a flat wire welding workpiece, the flat wire welding workpiece includes a flat wire and a welding piece, the flat wire is straight, the welding piece and the portion of the flat wire near the head of the flat wire are welded along the length direction of the flat wire, and the end of the welding piece near the tail of the flat wire has a structural plane perpendicular to the length direction of the flat wire; Pass the tail of the flat wire of the flat wire welding workpiece through the structural hole of the lower support plate, and make the installation plane on the lower support plate perpendicular to the axis of the structural hole fit with the structural plane; Connecting the upper support plate to the lower support plate through a connector, and positioning the portion of the flat wire welding workpiece that does not penetrate the structural hole between the upper support plate and the lower support plate; The tail of the flat wire and the upper support plate are pulled by a tensile testing machine to test the welding quality of the flat wire and the welded parts.

10. The method for tensile testing of a flat wire welding workpiece according to claim 9, wherein: The method further includes connecting a middle piece to the upper supporting plate before the tail of the flat wire and the upper supporting plate are pulled through the tensile machine, and the upper supporting plate is connected to the tensile machine through the middle piece.

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