Laser welding pressing tool

Abstract

The utility model discloses a laser welding hold-down clamp which comprises a connecting piece connected with a pressing mechanism of a welding device and a hold-down clamp body connected with the lower end of the connecting piece, the hold-down clamp body penetrates through the hold-down clamp body from top to bottom to form an avoiding cavity for avoiding a welding head, and the lower end of the hold-down clamp body tightly presses the surface of a workpiece. And a pressure sensor is arranged between the connecting piece and the pressing tool main body. According to the laser welding hold-down device, the laser welding hold-down device is improved, the pressure sensor is arranged between the connecting piece and the hold-down device body, the downward pressure of the hold-down device body can be accurately read, and therefore the pressure borne by the surface of a workpiece is controlled, and laser welding errors are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of laser welding positioning equipment, in particular to a laser welding press. Background Art

[0002] Laser processing technology utilizes the interaction between laser beams and matter to perform cutting, welding, surface treatment, drilling, and micromachining on materials (including metals and non-metals). As an advanced manufacturing technology, laser processing has been widely used in key sectors of the national economy, including automotive, electronics, electrical appliances, aviation, metallurgy, and machinery manufacturing. It plays an increasingly important role in improving product quality, labor productivity, automation, pollution prevention, and reducing material consumption.

[0003] Laser welding equipment features high speed, deep penetration, and minimal deformation. It can also be used to weld high-hardness materials such as titanium and quartz. During laser welding, unstable workpiece position can easily affect the weld width and depth, further impacting weld quality.

[0004] Prior art laser welding presses can be used to hold the workpiece in place during the laser welding process, ensuring weld quality. However, these presses typically rely on manual operator control of the pressure applied to the workpiece. This can lead to cumulative errors over time, and cumulative errors exceeding 0.2mm can affect weld quality.

[0005] In view of this, it is necessary to provide a laser welding press that can reduce errors. Utility Model Content

[0006] The purpose of the utility model is to overcome the lack of stability of laser welding presses in the prior art and to provide a laser welding press that can accurately control the pressure applied by the press body to the workpiece, which is achieved by arranging a pressure sensor between the press body and the connecting piece.

[0007] The technical solution of the present utility model provides a laser welding press, comprising a connecting piece connected to a downward pressing mechanism of a welding device and a press body connected to the lower end of the connecting piece, a avoidance cavity for avoiding the welding head is formed by penetrating the press body from top to bottom, the lower end of the press body presses the surface of the workpiece, and a pressure sensor is provided between the connecting piece and the press body.

[0008] In one of the optional technical solutions, the upper end of the connecting member is provided with a fixed connecting portion fixedly connected to the pressing mechanism, and the lower end of the connecting member is provided with a sliding connecting portion slidably connected to the pressing tool body.

[0009] In one of the optional technical solutions, the sliding connection portion includes a connecting column whose upper end is fixedly connected to the lower surface of the connecting piece, and a flange portion is provided at the upper end of the pressing tool body. The flange portion has a through hole matching the connecting column, and the connecting column can be slidably embedded in the through hole.

[0010] In one of the optional technical solutions, the sliding connection portion includes at least two connecting columns, and the pressure sensor is located between the connecting columns.

[0011] In one of the optional technical solutions, a limiting portion is provided at the lower end of the connecting column, and a return spring is provided around the outer circumference of the connecting column. The upper end of the return spring presses against the lower surface of the connecting piece, and the lower end presses against the upper surface of the flange portion.

[0012] In one of the optional technical solutions, an upper surface of the flange portion is provided with a mounting groove, and the pressure sensor is installed in the mounting groove.

[0013] In one of the optional technical solutions, a protective gas inlet is provided on the side of the press body, and the protective gas inlet is communicated with the avoidance cavity.

[0014] In one of the optional technical solutions, the opening direction of the shielding gas inlet is upward, and the angle between the shielding gas inlet and the horizontal plane is 30° to 60°.

[0015] In one of the optional technical solutions, a pressing portion is provided at the lower end of the pressing tool body, and a plurality of spaced-apart protrusions are provided at the lower end of the pressing portion.

[0016] In one of the optional technical solutions, the press body is an inverted trapezoidal structure with a cross-sectional area gradually decreasing from top to bottom.

[0017] The above technical solution has the following beneficial effects:

[0018] The laser welding press provided by the present invention sets the connecting piece and the press body in a state where they can slide relative to each other up and down, and sets a pressure sensor between the connecting piece and the press body. In the process that the connecting piece follows the downward pressing mechanism of the laser marking device to drive the press body to press the workpiece surface downward, the pressure value can be obtained in real time through the pressure sensor, thereby accurately controlling the downward pressure of the press body on the workpiece surface. Under the premise of ensuring that the press body reliably limits the position of the workpiece, the accumulated error of the laser welding press can be significantly reduced under long-term use to ensure the continuous accuracy of laser welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings:

[0020] Figure 1 A three-dimensional diagram of a laser welding press provided in one embodiment of the present invention;

[0021] Figure 2 This is an exploded view of a laser welding press provided in one embodiment of the present invention.

[0022] Reference numerals in the figures:

[0023] 1. Connector; 11. Fixed connection portion; 12. Sliding connection portion; 121. Connecting column;

[0024] 2. Pressing tool body; 21. Avoidance cavity; 22. Through hole; 23. Shielding gas inlet; 24. Pressing part; 241. Protrusion; 25. Flange;

[0025] 3. Pressure sensor. DETAILED DESCRIPTION

[0026] The following further describes specific embodiments of the present invention with reference to the accompanying drawings. Identical components are denoted by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inward" and "outward" refer to directions toward or away from the geometric center of a particular component, respectively.

[0027] In this utility model, unless otherwise specified or limited, the term "fixed" and the like should be understood in a broad sense. For example, "fixed" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0028] like Figure 1 and Figure 2 As shown, a laser welding press provided by an embodiment of the present invention includes a connecting piece 1 connected to the downward pressing mechanism of the welding device and a press body 2 connected to the lower end of the connecting piece 1. A avoidance cavity 21 for avoiding the welding head is formed from top to bottom through the press body 2. The lower end of the press body 2 presses the surface of the workpiece, and a pressure sensor 3 is provided between the connecting piece 1 and the press body 2.

[0029] Among them, the laser welding press, also known as the laser welding tooling, is installed on the laser welding device to clamp one or more workpieces to be welded. It includes at least a welding head and a pressing mechanism that can move up and down. The laser welding press is connected to the pressing mechanism to follow the pressing mechanism up and down to achieve the clamping of the workpiece. The upper end of the press body 2 is connected to the connector 1, and the upper end of the connector 1 is fixedly connected to the movable end of the pressing mechanism by means of threaded connection or clamping. The press body 2 can follow the connector 1 to move horizontally to align with the workpiece. The press body 2 can also follow the connector 1 to move up and down so that the lower end of the press body 2 contacts and presses the surface of the workpiece. In order to ensure that the pressure sensor 3 between the press body 2 can accurately receive the pressure value, the connection between the connector 1 and the press body 2 can be a movable connection with a certain upper and lower movable space. It should be noted that the connection between the connector 1 and the press body 2 can also be a fixed connection with deformation space, which is achieved by a connection structure such as bolts. Sufficient installation space is set between the connector 1 and the press body 2, and the pressure sensor 3 is installed between the press body 2 and the connector 1 and ensures that the reading of the pressure sensor 3 is 0 when there is no force.

[0030] The overall structure of the press body 2 is determined by the workpiece to be welded and the welding space. A structure with a larger top and a smaller bottom can be adopted to reduce the space required for the movement of the press body 2 while ensuring structural stability. The middle part of the press body 2 is hollowed out from top to bottom to form a avoidance cavity 21. The welding head can pass through the avoidance cavity 21 from top to bottom to perform laser welding on the surface of the workpiece. Since the welding area may be relatively wide, in order to avoid the need for repeated positioning and pressing between the press body 2 and the workpiece in one laser welding, the avoidance cavity 21 can be set to a size that can cover multiple welding points at one time, for example, it can be set to a wider structure, so as to ensure that the welding head can move in the avoidance cavity 21 and perform multiple welding on the workpiece.

[0031] By adding a pressure sensor 3 between the connector 1 and the press body 2, the pressure on the workpiece during each welding can be accurately measured, and a closed-loop control system can be formed in conjunction with the laser welding device to calculate the stroke compensation of the pressing mechanism to compensate for the tolerance of the workpiece welding point.

[0032] In summary, the laser welding press provided by the embodiment of the present invention sets the connector 1 and the press body 2 to a state where they can slide relative to each other up and down, and sets a pressure sensor 3 between the connector 1 and the press body 2, so that when the connector 1 follows the downward pressure mechanism of the laser trace device to drive the press body 2 to press the workpiece surface downward, the pressure value can be obtained in real time through the pressure sensor 3, thereby accurately controlling the downward pressure of the press body 2 on the workpiece surface. Under the premise of ensuring that the press body 2 can reliably limit the position of the workpiece, under long-term use, the cumulative error of the laser welding press can be significantly reduced to ensure the continuous accuracy of laser welding. In addition, by measuring and recording the pressure of each weld point, the pressure record can be used to quickly trace the subsequent poor welding situation.

[0033] In one embodiment, Figure 2 As shown, the upper end of the connecting member 1 is provided with a fixed connection portion 11 fixedly connected to the pressing mechanism, and the lower end of the connecting member 1 is provided with a sliding connection portion 12 slidably connected to the press body 2. The fixed connection portion 11 includes an upward threaded hole, and the movable end of the pressing mechanism and the fixed connection portion 11 of the connecting member 1 are fixed to each other through a threaded connection.

[0034] In one embodiment, Figure 2 As shown, the sliding connection part 12 includes a connecting column 121 whose upper end is fixedly connected to the lower surface of the connecting member 1, and the upper end of the pressing tool body 2 is provided with a flange part 25, and the flange part 25 has a through hole 22 matching the connecting column 121, and the connecting column 121 can be slidably embedded in the through hole 22.

[0035] In this embodiment, the flange portion 25 is provided at the upper end of the press body 2 to provide an independent sliding connection space for the connecting column 121 of the connector 1, thereby avoiding positional conflicts between the sliding connection and the weld joint. Preferably, the flange portion 25 is a rectangular parallelepiped structure protruding outward from the upper end of the press body 2.

[0036] In one embodiment, the sliding connection portion 12 includes at least two connecting posts 121, and the pressure sensor 3 is located between the connecting posts 121. Two or more connecting posts 121 are arranged around the periphery of the pressure sensor 3, and through holes 22 with matching positions and numbers are provided on the flange portion 25, so that each connecting post 121 is respectively embedded in the through hole 22, thereby achieving a sliding connection with a limited horizontal position between the connector 1 and the press body 2.

[0037] In one embodiment, a stopper is provided at the lower end of the connecting post 121, and a return spring is provided around the outer circumference of the connecting post 121. The upper end of the return spring abuts against the lower surface of the connector 1, and the lower end abuts against the upper surface of the flange 25. The provision of the return spring ensures that the pressure sensor 3 will not display a pressure reading when the press body 2 is not under pressure, thereby further improving the measurement accuracy of the pressure sensor 3.

[0038] In one embodiment, the upper surface of the flange portion 25 is provided with a mounting groove, and the pressure sensor 3 is mounted in the mounting groove. Specifically, the pressure sensor 3 is configured as a rectangular block structure, and the mounting groove is correspondingly configured as a rectangular recessed structure. The rectangular block structure of the pressure sensor 3 can uniformly measure the downward pressure of the connector 1 and is not easily damaged.

[0039] In one embodiment, a shielding gas inlet 23 is provided on the side of the press body 2, and the shielding gas inlet 23 is connected to the avoidance cavity 21. The shielding gas inlet 23 also includes a pipe connected to the interior of the avoidance cavity 21. The provision of the shielding gas inlet 23 enables the avoidance cavity 21 to be filled with shielding gas, thereby allowing the shielding gas to cover the laser welding area, thereby fully protecting the weld of the workpiece and ensuring the quality of the laser welding.

[0040] In one embodiment, the shielding gas inlet 23 is opened upward, and the angle between the shielding gas inlet 23 and the horizontal plane is 30° to 60°.

[0041] In this embodiment, the inclination of the shielding gas inlet 23 within this angle range can ensure that the shielding gas can be smoothly injected into the avoidance cavity 21 from the side of the pressing tool body 2 to protect the laser welding part of the workpiece, while ensuring that the shielding gas evenly covers the welding area and reducing gas waste.

[0042] In one embodiment, a pressing portion 24 is provided at the lower end of the pressing tool body, and a plurality of spaced protrusions 241 are provided at the lower end of the pressing portion 24. The plurality of protrusions are arranged at the lower end of the pressing portion 24 around the outer periphery of the avoidance cavity 21, and the smaller area and more pressure points of the protrusions are used to specifically press the workpiece surface, ensuring that the pressing tool body 2 can press the workpiece surface, avoiding gaps due to a large connection area, and thus avoiding unstable limit.

[0043] In one embodiment, the press body 2 has an inverted trapezoidal structure with a gradually decreasing cross-sectional area from top to bottom. The inverted trapezoidal structure of the press body 2 ensures a reliable connection between the upper end and the connector 1, while the lower end is smaller, making it easier to clamp the workpiece in a confined space. Furthermore, the cross-sectional area of the clamping portion 24 decreases abruptly, giving the outer surface of the press body 2 a stepped structure, further reducing the volume of the clamping portion 24 and making the press body 2 more flexible and applicable to a wider range of applications.

[0044] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0045] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principles of the present invention, several other modifications can be made, which should also be considered as the scope of protection of the present invention.

Claims

1. A laser welding press, characterized in that: The invention comprises a connecting piece (1) connected to a downward pressing mechanism of a welding device and a pressing tool body (2) connected to the lower end of the connecting piece (1); a avoiding cavity (21) for avoiding the welding head is formed by penetrating the pressing tool body (2) from top to bottom; the lower end of the pressing tool body (2) presses the surface of a workpiece; and a pressure sensor (3) is provided between the connecting piece (1) and the pressing tool body (2).

2. The laser welding press according to claim 1, characterized in that: The upper end of the connecting member (1) is provided with a fixed connecting portion (11) fixedly connected to the pressing mechanism, and the lower end of the connecting member (1) is provided with a sliding connecting portion (12) slidably connected to the pressing tool body (2).

3. The laser welding press according to claim 2, characterized in that: The sliding connection portion (12) includes a connection column (121) whose upper end is fixedly connected to the lower surface of the connecting member (1); the upper end of the pressing tool body (2) is provided with a flange portion (25); the flange portion (25) has a through hole (22) matching the connection column (121); the connection column (121) can be slidably embedded in the through hole (22).

4. The laser welding press according to claim 3, characterized in that: The sliding connection portion (12) comprises at least two connecting columns (121), and the pressure sensor (3) is located between the connecting columns (121).

5. The laser welding press according to claim 4, characterized in that: A limiting portion is provided at the lower end of the connecting column (121), and a return spring is provided around the outer periphery of the connecting column (121). The upper end of the return spring presses against the lower surface of the connecting member (1), and the lower end presses against the upper surface of the flange portion (25).

6. The laser welding press according to claim 3, characterized in that: The upper surface of the flange portion (25) is provided with a mounting groove, and the pressure sensor (3) is mounted in the mounting groove.

7. The laser welding press according to claim 1, characterized in that: A protective gas input port (23) is provided on the side of the pressing tool body (2), and the protective gas input port (23) is communicated with the avoidance cavity (21).

8. The laser welding press according to claim 7, characterized in that: The opening direction of the protective gas input port (23) faces upward, and the angle between the protective gas input port (23) and the horizontal plane is 30° to 60°.

9. The laser welding press according to claim 1, characterized in that: A pressing portion (24) is provided at the lower end of the pressing tool body, and a plurality of spaced protrusions (241) are provided at the lower end of the pressing portion (24).

10. The laser welding press according to any one of claims 1 to 9, characterized in that: The press body (2) is an inverted trapezoidal structure with a cross-sectional area gradually decreasing from top to bottom.

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