Sheet metal spot welding apparatus and method

Abstract

The application discloses a kind of sheet no-bump welding equipment, for the welding work of sheet, including spot welding frame, the air pump is fixedly installed in the top of the spot welding frame, the air outlet of the air pump is fixedly communicated with vent tube, control box is fixedly installed in the side wall of the spot welding frame one side;The no-bump welding assembly is arranged in the operating side of the spot welding frame, and the no-bump welding assembly includes upper electrode and lower electrode welding assembly, the upper electrode is slidably installed in the operating side of spot welding frame, and the lower electrode welding assembly is fixedly installed on platform, the welding surface of the upper electrode is arranged as plane, the upper electrode and lower electrode welding assembly are electric contact welding structure, the foot switch is arranged in the bottom of the spot welding frame, and the foot switch is communicated with the air pump;The application also discloses a kind of sheet no-bump welding equipment electric welding method, without making bump on the surface of sheet as welding surface, reduce process cost, shorten production time period, make welding process simple.

Description

Technical Field

[0001] This invention belongs to the field of spot welding technology for thin planar plates, specifically relating to a non-protrusion spot welding device for thin plates, and more particularly to a spot welding method for the non-protrusion spot welding device for thin plates. Background Technology

[0002] Resistance welding is a type of welding method that uses resistance heat as energy. Generally, the workpieces are placed under a certain electrode pressure and the resistance heat generated when the current passes through the workpieces melts the contact surface between the two workpieces to achieve a connection. A relatively large current is usually used. In order to prevent electric arcs from forming on the contact surface and to forge the weld metal, pressure must be applied throughout the welding process.

[0003] In thin plate welding, to increase welding strength and ensure effective welding area, protrusions are often made on the surface of the thin plate as welding contact surfaces, which increases process costs and extends production cycle. Summary of the Invention

[0004] The purpose of this invention is to provide a thin plate non-protrusion welding device to solve the problems mentioned in the background art, effectively increase the contact area, make the pressing tight, and ensure reliable discharge, thereby guaranteeing the welding strength.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A non-protrusion spot welding device for thin plates is used for welding thin plates. It includes a spot welding frame, an air pump is fixedly installed on the top of the spot welding frame, an air outlet is fixedly connected to an air pipe, and a control box is fixedly installed on one side wall of the spot welding frame.

[0007] The spot welding machine frame is equipped with a non-protrusion spot welding assembly on the operating side. The non-protrusion spot welding assembly includes an upper electrode and a lower electrode welding assembly. The upper electrode is slidably installed on the operating side of the spot welding machine frame, and the lower electrode welding assembly is fixedly installed on the platform. The welding surface of the upper electrode is planar. The upper electrode and the lower electrode welding assembly are electrical contact welding structures.

[0008] A foot switch is installed at the bottom of the spot welding machine frame, and the foot switch is connected to the air pump.

[0009] The lower electrode welding assembly includes a welding ball pressure plate, a copper welding ball, and a lower electrode. The welding ball pressure plate and the lower electrode are fixedly connected by bolts, and the copper welding ball is embedded in the lower electrode by the welding ball pressure plate. The vent pipe is connected to the lower electrode.

[0010] The solder ball pressure plate is an insulating pressure plate, and the highest point of the copper solder ball surface is higher than the upper surface of the solder ball pressure plate.

[0011] The upper arm connecting assembly for connecting the upper electrode and the spot welding machine frame is provided above the upper electrode. The upper arm connecting assembly includes an arc-shaped support plate and a transition plate fixedly connected to one side of the arc-shaped support plate. The arc-shaped support plate is fixedly connected to the operating side of the spot welding machine, and the arc-shaped support plate is a copper flexible board structure.

[0012] The spot welding machine frame has a support base fixedly installed on the operating side above the arc-shaped support plate. An electric push rod is fixedly installed on the top of the support base, and the telescopic rod end of the electric push rod is fixedly connected to the transition plate.

[0013] The spot welding machine frame has a copper connecting plate fixedly installed on the operating side below the arc-shaped support plate. The copper connecting plate has a sliding groove, and a slider is provided at the bottom of the lower electrode. The slider and the sliding groove are fitted with a clearance.

[0014] The lower electrode has equidistant spherical recesses at its top, and the spherical recesses are configured as hemispherical depressions, with the copper solder balls placed in close contact within the spherical recesses.

[0015] The welding ball pressure plate has a positioning hole that matches the spherical surface of the copper welding ball, and the top of the copper welding ball passes through the positioning hole and extends above the upper surface of the welding ball pressure plate.

[0016] The invention also provides an electric welding method for a non-protrusion welding device for thin plates, characterized by the following steps:

[0017] S1. Take the required number of copper solder balls and place them in the ball socket of the lower electrode. Select a solder ball pressure plate made of insulating material and install it on the upper part of the lower electrode with bolts to fix the copper solder balls and form the lower electrode welding assembly.

[0018] S2. The upper and lower electrodes are connected to the welding power source. During welding, the thin plate workpiece is placed on the welding electrode assembly consisting of the welding ball pressure plate, the copper welding ball and the lower electrode.

[0019] S3. Place the workpiece to be welded between the upper and lower electrodes, while ensuring that the workpiece is in contact with the copper solder ball.

[0020] S4. Start the electric push rod to drive the upper electrode downward. When the electrode discharges, the contact point pressure is at its maximum, and the electrode is welded.

[0021] In summary, due to the adoption of the above-mentioned technologies, the beneficial effects of this invention are:

[0022] In this invention, the shortcomings of the existing process can be overcome by sequentially setting an upper electrode and a lower electrode welding assembly consisting of a welding ball pressure plate, copper welding balls and a lower electrode. The spot welding electrode structure formed above effectively increases the contact area, making the pressing tight and the discharge reliable, thereby ensuring the welding strength.

[0023] In this invention, there is no need to manufacture protrusions on the surface of the thin plate as a welding surface, which reduces process costs, shortens the production time cycle, and simplifies the welding process. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of a thin-plate non-protrusion welding device according to the present invention.

[0025] Figure 2 This is a three-dimensional structural diagram of the welding part of a thin-plate non-protrusion welding device according to the present invention;

[0026] Figure 3 This is a partially enlarged front view of the welding assembly for the upper and lower electrodes of the present invention.

[0027] Figure 4 This is a side cross-sectional view of the lower electrode welding assembly of the present invention;

[0028] Figure 5 This is a flowchart of a spot welding method for a non-protrusion spot welding device for thin plates according to the present invention.

[0029] In the diagram: 1. Spot welding frame; 2. Air pump; 4. Control box; 5. No-projection spot welding assembly; 501. Upper electrode; 502. Lower electrode welding assembly; 5021. Welding ball pressure plate; 5022. Copper welding ball; 5023. Lower electrode; 5024. Ball socket; 5025. Positioning hole; 6. Foot switch; 7. Upper arm connecting assembly; 701. Arc-shaped support plate; 702. Transition plate; 8. Support base; 9. Electric push rod; 10. Copper connecting plate; 1001. Slide groove; 11. Support frame; 12. Electrode power supply. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. 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 claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific context of the specification.

[0033] This invention provides, for example Figure 1-4 The diagram shows a non-protrusion spot welding device for thin plates, used for welding thin plates. It includes a spot welding frame 1, an air pump 2 fixedly installed on the top of the spot welding frame 1, an air outlet pipe fixedly connected to the air pump 2, a control box 4 fixedly installed on one side wall of the spot welding frame 1, and a foot switch 6 provided at the bottom of the spot welding frame 1. The foot switch 6 is connected to the air pump 2. The placement of the air pump 2 and the control box 4 facilitates the removal of the finished spot welded product. The foot switch 6 serves as the control switch for the air pump 2, making manual operation convenient and quick.

[0034] The spot welding frame 1 is equipped with a non-protrusion spot welding assembly 5 on its operating side. The non-protrusion spot welding assembly 5 includes an upper electrode 501 and a lower electrode welding assembly 502. The upper electrode 501 is slidably mounted on the operating side of the spot welding frame 1, and the lower electrode welding assembly 502 is fixedly mounted on the platform. The welding surface of the upper electrode 501 is planar. The upper electrode 501 and the lower electrode welding assembly 502 are electrically contact welding structures. The lower electrode welding assembly 502 includes a welding ball pressure plate 5021, copper welding balls 5022, and... The lower electrode 5023 is fixedly connected to the welding ball pressure plate 5021 by bolts, and the copper welding ball 5022 is embedded in the lower electrode 5023 by the welding ball pressure plate 5021. The vent pipe is connected to the lower electrode 5023. The welding ball pressure plate 5021 is an insulating pressure plate. The highest point of the surface of the copper welding ball 5022 is higher than the upper surface of the welding ball pressure plate 5021. In specific operation, the spot welding machine is started, driving the upper electrode 501 to move down and approach the lower electrode welding assembly 502 to weld the thin plate.

[0035] Above the upper electrode 501, an upper arm connecting assembly 7 is provided for connecting the upper electrode 501 and the spot welding machine frame 1. The upper arm connecting assembly 7 includes an arc-shaped support plate 701 and a transition plate 702 fixedly connected to one side of the arc-shaped support plate 701. The arc-shaped support plate 701 is fixedly connected to the operating side of the spot welding machine, and the arc-shaped support plate 701 is a copper flexible board structure. A support base 8 is fixedly installed on the operating side of the spot welding machine frame 1 above the arc-shaped support plate 701. The top of the support base 8 is fixedly installed with... An electric push rod 9 is provided, the telescopic rod end of which is fixedly connected to the transition plate 702. A copper connecting plate 10 is fixedly installed on the operating side of the spot welding frame 1 below the arc-shaped support plate 701. A sliding groove 1001 is provided in the copper connecting plate 10. A slider is provided at the bottom of the lower electrode 5023. The slider and the sliding groove 1001 are in clearance fit. The arc-shaped support plate 701 is a copper flexible plate structure. Activating the electric push rod 9 can drive the upper electrode 501 to slide under the premise of support force.

[0036] The lower electrode 5023 has equidistantly spaced ball-shaped recesses 5024 on its top. Each ball-shaped recess 5024 has a hemispherical concave structure. The copper solder balls 5022 are fitted into the ball-shaped recesses 5024. The solder ball pressure plate 5021 has positioning holes 5025 that match the spherical surface of the copper solder balls 5022. The top of the copper solder balls 5022 passes through the positioning holes 5025 and extends above the upper surface of the solder ball pressure plate 5021. 5. It extends above the upper surface of the solder ball pressure plate 5021, ensuring that the copper solder ball 5022 is installed stably after pressing, while exposing the positioning hole 5025. The highest point of the top of the copper solder ball 5022 is higher than the solder ball pressure plate 5021, with a height difference set within the range of 0.02-0.03mm. This ensures that the highest point of the copper solder ball 5022 and the lower surface of the upper electrode 501 make point contact during welding, and also ensures that when the upper electrode 501 is pressed down for welding, it will not put pressure on the thin plate, causing the thin plate to deform.

[0037] An electrode power supply 12 is fixedly connected to one side of the arc-shaped support plate 701 and the copper connecting plate 10, and the motor power supply 12 is fixedly installed inside the spot welding frame 1.

[0038] During welding, thin plate workpieces are placed on the lower electrode welding assembly 502, which consists of welding ball pressure plate 5021, copper welding ball 5022, and lower electrode 5023. The workpiece contacts the copper welding ball 5022. Since the copper welding ball 5022 is spherical and the welding surface of the upper electrode 501 is flat, the contact with the thin plate workpiece is point contact. When the upper electrode 501 and the lower electrode welding assembly 502 discharge, the contact point pressure is the largest, the discharge current is more concentrated, the welding heat generated is greater, and the welding efficiency is higher. In addition, since the contact surface of the upper electrode 501 is flat, the appearance is smoother.

[0039] A support frame 11 is fixedly connected between the lower electrode welding assembly 502 and the outer wall of the spot welding machine frame 1.

[0040] like Figure 5 As shown, an electric welding method for a thin plate non-projectile welding device includes the following steps:

[0041] S1. Take the required number of copper solder balls 5022 and place them in the ball socket 5024 of the lower electrode 5023. Select the solder ball pressure plate 5021 of insulating material and install it on the upper part of the lower electrode 5023 with bolts to fix the copper solder balls 5022, thus forming the lower electrode welding assembly 502.

[0042] S2. The upper electrode 501 and the lower electrode 5023 are connected to the welding power source. During welding, the thin plate workpiece is placed on the welding electrode assembly composed of the welding ball pressure plate 5021, the copper welding ball 5022 and the lower electrode 5023.

[0043] S3. Place the workpiece to be welded between the upper electrode 501 and the lower electrode 5023, while ensuring that the workpiece is in contact with the copper solder ball 5022.

[0044] S4. Start the electric push rod 9, which drives the upper electrode 501 to move downward. When the electrode discharges, the contact point pressure is at its maximum, and the electrode is welded.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0046] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A thin-plate non-projection welding device, used for welding thin plates, characterized in that, The system includes a spot welding frame (1), on which an air pump (2) is fixedly installed. The air outlet of the air pump (2) is fixedly connected to an air pipe. A control box (4) is fixedly installed on one side wall of the spot welding frame (1). A non-protrusion spot welding assembly (5) is provided on the operating side of the spot welding frame (1). The non-protrusion spot welding assembly (5) includes an upper electrode (501) and a lower electrode welding assembly (502). The welding surface of the upper electrode (501) is planar. The upper electrode (501) and the lower electrode welding assembly (502) are electrically contact welding structures. A foot switch (6) is provided at the bottom of the spot welding frame (1). The foot switch (6) and the air pump (2) are connected to each other. The lower electrode welding assembly (502) includes a welding ball pressure plate (5021), a copper welding ball (5022), and a lower electrode (5023). The welding ball pressure plate (5021) and the lower electrode (5023) are fixedly connected by bolts, and the copper welding ball (5022) is embedded in the lower electrode (5023) by the welding ball pressure plate (5021). The vent pipe is connected to the lower electrode (5023). The welding ball pressure plate (5021) is an insulating pressure plate, and the highest point of the surface of the copper welding ball (5022) is higher than the upper surface of the welding ball pressure plate (5021). Above the upper electrode (501), there is a device for connecting the upper electrode (501) and the spot welding frame (1). The upper arm connecting assembly (7) includes an arc-shaped support plate (701) and a transition plate (702) fixedly connected to one side of the arc-shaped support plate (701). The arc-shaped support plate (701) is fixedly connected to the operating side of the spot welding machine frame, and the arc-shaped support plate (701) is a copper flexible plate structure. A support base (8) is fixedly installed on the operating side of the spot welding machine frame (1) above the arc-shaped support plate (701). An electric push rod (9) is fixedly installed on the top of the support base (8). The telescopic rod end of the electric push rod (9) is fixedly connected to the transition plate (702). A copper flexible plate is fixedly installed on the operating side of the spot welding machine frame (1) below the arc-shaped support plate (701). The connecting plate (10) has a groove (1001) inside. The bottom of the lower electrode (5023) is provided with a slider, and the slider and the groove (1001) are fitted with a clearance. The top of the lower electrode (5023) is provided with a ball socket (5024) at equal intervals. The ball socket (5024) is set as a hemispherical recessed structure. The copper solder ball (5022) is placed in the ball socket (5024). The solder ball pressure plate (5021) has a positioning hole (205) that matches the spherical surface of the copper solder ball (5022). The top of the copper solder ball (5022) passes through the positioning hole (205) and extends to a height above the upper surface of the solder ball pressure plate (5021).

2. A welding method for a thin plate non-protrusion welding device according to claim 1, characterized in that: The process includes the following steps: S1. Take the required number of copper solder balls (5022) and place them in the ball socket of the lower electrode (5023). Select a solder ball pressure plate (5021) made of insulating material and install it on the upper part of the lower electrode (5023) with bolts to fix the copper solder balls (5022) and form the lower electrode welding assembly (502); S2. Connect the upper electrode (501) and the lower electrode (5023) to the welding power supply. During the welding operation, the thin plate workpiece is placed on the welding electrode assembly composed of the solder ball pressure plate (5021), the copper solder balls (5022) and the lower electrode (5023); S3. Place the workpiece to be welded between the upper electrode (501) and the lower electrode (5023) while ensuring that the workpiece and the copper solder balls (5022) are in point contact; S4. Start the electric push rod (9) to drive the upper electrode (501) to act downward. When the electrode discharges, the contact point pressure is the maximum, and the welding is completed.

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