An integrated traceless processing technology for press riveting and welding of sheet metal parts

Abstract

The present invention discloses an integrated, traceless processing technology for press riveting and welding of sheet metal parts. The technology can improve the effect of press riveting strength, and has a good protective effect on thin sheet metal parts without any welding marks. The present invention includes the following steps: first, the press riveting process is implemented: ① pre-processing of the press riveting of two sheet metal parts; ② the tooth rivet passes through the two sheet metal parts; ③ the tooth rivet is pressed down by a press riveting machine to complete the riveting of the two sheet metal parts; ④ the pressure head of the press riveting machine is still pressed tightly on the tooth rivet, and then welding is started; the welding process has the following steps: ① connecting one electrode of a medium frequency inverter welding machine to the pressure head or lower die of the press riveting machine, and connecting the other electrode of the medium frequency inverter welding machine to the two sheet metal parts; ② starting the medium frequency inverter welding machine, and melting the metal at the riveted interference fit between the tooth and the riveted hole wall; ③ stopping the medium frequency inverter welding machine to complete the welding, raising the pressure head of the press riveting machine, and removing the sheet metal parts. The present invention is applied to the technical field of sheet metal processing.

Description

Technical Field

[0001] The present invention relates to a method for processing sheet metal parts, and in particular to an integrated traceless processing technology for press riveting and welding sheet metal parts. Background Art

[0002] Many structures of sheet metal box products require pressure riveting. Due to the cumulative tolerances of rivet hole processing accuracy, hole position tolerance, screw tolerance, etc., there is a risk of loosening of the rivet screws. Some products have requirements for the strength of pressure rivets, which need to withstand large torque or frequent use, resulting in falling after a period of use. To solve this problem, the traditional practice in the industry is to use welding to solve the problem of loose rivets. Although the loose rivets are solved by welding, the welding causes the back of the sheet metal at the welding position to be burned and bulged, and an additional surface treatment process is required to solve this defect. This method requires additional welding and surface treatment processes, which is a huge waste in terms of efficiency and cost. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide an integrated traceless processing technology for sheet metal riveting and welding. The technology can improve the riveting strength effect and provide good protection for thin sheet metal parts without any welding marks.

[0004] The technical solution adopted by the present invention is: the sheet metal parts pressure riveting and welding integrated traceless processing technology of the present invention includes a pressure riveting process and a welding process,

[0005] First, the riveting process is implemented, which includes the following steps:

[0006] ①Pre-treatment of two sheet metal parts before riveting;

[0007] ②The tooth rivet passes through the two sheet metal parts;

[0008] ③ Use a riveting machine to press down the tooth rivets to complete the riveting of the two sheet metal parts;

[0009] ④The pressure head of the riveting machine is still pressed tightly on the tooth rivet, and then the welding process begins;

[0010] Then the welding process is implemented, which includes the following steps:

[0011] ① Connect one electrode of the medium frequency inverter welding machine to the pressure head or lower die of the riveting machine, and connect the other electrode of the medium frequency inverter welding machine to the two sheet metal parts;

[0012] ② Start the medium frequency inverter welding machine and fuse the metals at the interference fit between the tooth and the riveted hole wall;

[0013] ③The medium frequency inverter welding machine stops working, welding is completed, the pressure head of the riveting machine rises, and the sheet metal parts are taken out.

[0014] Furthermore, the pre-riveting process of the two sheet metal parts includes the following steps:

[0015] ①Process a rivet hole on each of the two sheet metal parts;

[0016] ② Place the two sheet metal parts together in the riveted state, with the rivet holes on the two sheet metal parts overlapping. At this time, the lower surface of the upper sheet metal part is in contact with the upper surface of the lower sheet metal part.

[0017] ③ Use a soft plug to pass through the two sheet metal parts through the rivet holes on the two sheet metal parts;

[0018] ④ Spray an insulating layer on the upper surface of the upper sheet metal and the lower surface of the lower sheet metal and around the rivet holes. After the serrated rivets are riveted, both ends of the serrated rivets are pressed tightly against the insulating layer, and there is no electrical connection between the two ends of the serrated rivets and the sheet metal parts.

[0019] ⑤Remove the soft plug.

[0020] Furthermore, the lower die of the riveting machine is arranged on the workbench of the riveting machine, and an insulating support block is arranged between the lower die and the workbench.

[0021] Furthermore, a tab connecting portion is provided on the pressing head or the lower die of the riveting machine.

[0022] Furthermore, the insulating layer is annular and is arranged concentrically with the riveting hole.

[0023] Furthermore, the width of the circular ring is 5 mm to 10 mm.

[0024] The beneficial effects of the present invention are: since the metals are mutually melted at the teeth of the riveted interference fit, the effect of improving the pressure riveting strength can be achieved, and a good protective effect is played on thin sheet metal parts without any welding marks.

[0025] Figures in the specification

[0026] Figure 1 is a schematic diagram of an upper sheet metal component 1 and a lower sheet metal component 2;

[0027] Figure 2 This is a schematic diagram of the upper sheet metal part 1 and the lower sheet metal part 2 after punching;

[0028] Figure 3 It is a schematic diagram of inserting a soft plug 9 into a riveting hole 7;

[0029] Figure 4 is a schematic diagram of spraying the insulating layer 8;

[0030] Figure 5It is a top view or bottom view of the upper sheet metal part 1 or the lower sheet metal part 2 after the soft plug 9 is removed;

[0031] Figure 6 This is a schematic diagram of an upper sheet metal part 1 or a lower sheet metal part 2 being placed on a riveting machine;

[0032] Figure 7 This is a schematic diagram of the press head 4 after riveting;

[0033] Figure 8 It is a schematic diagram of connecting to a medium frequency inverter welding machine 6 when welding after riveting;

[0034] Figure 9 It is the welding current trend diagram of the medium frequency inverter welding machine 6;

[0035] Figure 10 yes Figure 9 An enlarged schematic diagram of

[0036] Figure 11 is a schematic diagram of embodiment 2;

[0037] Among them, there are upper sheet metal part 1, lower sheet metal part 2, flower tooth rivet 3, pressing head 4, lower die 5, medium frequency inverter welding machine 6, riveting hole 7, insulating layer 8, soft plug 9, tab connection part 10, and insulating support block 11. DETAILED DESCRIPTION

[0038] Example 1

[0039] like Figures 1 to 9 As shown, in this embodiment, the present invention adopts a riveting and welding integrated design, which specifically includes a press riveting process and a welding process.

[0040] First, the riveting process is implemented, which includes the following steps:

[0041] ① Pre-riveting treatment of two sheet metal parts, the two sheet metal parts including an upper sheet metal part 1 and a lower sheet metal part 2;

[0042] ② The tooth rivet 3 passes through the upper sheet metal 1 and the lower sheet metal 2, as shown in the figure. Figure 1 As shown;

[0043] ③ Use a riveting machine to press down the tooth rivet 3 to complete the riveting of the upper sheet metal 1 and the lower sheet metal 2. During the riveting process, the tooth rivet 3 is deformed and the teeth will be in interference fit with the rivet hole 7. Figure 7 As shown;

[0044] ④ The pressure head 4 of the riveting machine is still pressed tightly on the tooth rivet 3, and then the welding process begins;

[0045] Then the welding process is carried out, such as Figures 8 to 10 The welding process includes the following steps:

[0046] ① Connect one electrode of the medium frequency inverter welding machine 6 to the pressure head 4 or the lower die 5 of the riveting machine, and connect the other electrode of the medium frequency inverter welding machine 6 to the upper sheet metal part 1 and the lower sheet metal part 2;

[0047] ② Start the medium frequency inverter welding machine 6, and fuse the metals at the interference fit between the tooth and the wall of the rivet hole 7;

[0048] ③ The medium frequency inverter welding machine 6 stops working, the welding is completed, the pressure head 4 of the riveting machine is raised, and the sheet metal part is taken out.

[0049] Furthermore, the pre-riveting treatment of the upper sheet metal part 1 and the lower sheet metal part 2 includes the following steps:

[0050] ① Process a rivet hole 7 on the upper sheet metal part 1 and the lower sheet metal part 2 respectively;

[0051] ② Lay the upper sheet metal 1 and the lower sheet metal 2 together in the riveted state, with the rivet holes 7 on the upper sheet metal 1 and the lower sheet metal 2 overlapping. At this time, the lower surface of the upper sheet metal is in contact with the upper surface of the lower sheet metal;

[0052] ③ Use a soft plug 9 to pass through the rivet holes 7 on the upper sheet metal 1 and the lower sheet metal 2; the design of the soft plug 9 can ensure that the spray insulation layer will not be sprayed on the inside of the rivet hole 7

[0053] ④ Spray an insulating layer on the upper surface of the upper sheet metal and the lower surface of the lower sheet metal around the rivet hole 7. After the serrated rivet 3 is riveted, both ends of the serrated rivet 3 are tightly pressed against the insulating layer 8. The two ends of the serrated rivet 3 are not electrically connected to the upper sheet metal 1 and the lower sheet metal 2.

[0054] ⑤ Remove the soft plug 9 to ensure that the tooth rivet 3 can be connected to the inside of the rivet hole 7.

[0055] In this embodiment, the lower die 5 of the press riveting machine is arranged on the workbench of the press riveting machine, and an insulating support block 11 is arranged between the lower die 5 and the workbench. The design of the insulating support block 11 ensures that the lower die 5 does not leak electricity.

[0056] In this embodiment, a tab connection portion 10 is provided on the pressure head 4 of the press riveting machine. With such a design, the current of the medium frequency inverter welding machine 6 can flow through the pressure head 4 to the serrated rivet 3 .

[0057] In this embodiment, the insulating layer 8 is annular and is concentrically arranged with the riveting hole 7. Such a design ensures that the insulating layer 8 can be fully utilized without wasting materials.

[0058] In this embodiment, the annular ring has a width of 10 mm. The 10 mm ring width ensures that the two ends of the serrated rivet 3 are not electrically connected to the upper sheet metal part 1 and the lower sheet metal part 2, and no black welding spots are left on the surface of the sheet metal parts.

[0059] Example 2

[0060] like Figure 11 As shown, the difference between this embodiment and the first embodiment is that the ram 4 of the riveting machine is not provided with a tab connecting portion 10 , but the tab connecting portion 10 is provided on the lower die 5 .

[0061] The working principle of the present invention: The present invention is based on a riveting machine and adds a medium frequency inverter welding machine 6. Through the setting of the insulating layer, after the riveting is completed, the medium frequency inverter welding machine 6 is connected to a large current. The large current passes through the upper sheet metal 1 and the lower sheet metal 2, and then passes through the teeth of the tooth rivet 7. Finally, it passes through the tooth rivet 7 and flows back to the motor of the medium frequency inverter welding machine 6. Since the contact surface at the riveted interference fit between the teeth and the wall of the rivet hole 7 is the smallest, the resistance is the largest, and the heat generation is the most, and there is an extrusion force between the teeth of the tooth rivet 3 and the wall of the rivet hole 7 under the action of the pressure head 4, the riveted interference fit between the teeth of the tooth rivet 3 and the wall of the rivet hole 7 can be quickly fused, so that the pressure riveting welding is completed in one go, thereby achieving the effect of improving the pressure riveting strength, and playing a good protective role for thin sheet metal parts without any welding marks.

[0062] Although the embodiments of the present invention are described with practical solutions, they do not limit the meaning of the present invention. For those skilled in the art, it is obvious to modify the implementation scheme and combine it with other solutions based on this description.

Claims

1. A sheet metal part pressure riveting and welding integrated traceless processing technology, including pressure riveting process and welding process, characterized by: First, the riveting process is implemented, which includes the following steps: ①Pre-treatment of two sheet metal parts before riveting; ②The tooth rivet passes through the two sheet metal parts; ③ Use a riveting machine to press down the tooth rivets to complete the riveting of the two sheet metal parts; ④The pressure head of the riveting machine is still pressed tightly on the tooth rivet, and then the welding process begins; Then the welding process is implemented, which includes the following steps: ① Connect one electrode of the medium frequency inverter welding machine to the pressure head or lower die of the riveting machine, and connect the other electrode of the medium frequency inverter welding machine to the two sheet metal parts; ② Start the medium frequency inverter welding machine and fuse the metals at the interference fit between the tooth and the riveted hole wall; ③The medium frequency inverter welding machine stops working, welding is completed, the pressure head of the riveting machine rises, and the sheet metal parts are taken out.

2. The integrated traceless processing technology for press riveting and welding of sheet metal parts according to claim 1 is characterized in that: The pre-treatment of two sheet metal parts for riveting includes the following steps: ①Process a rivet hole on each of the two sheet metal parts; ② Place the two sheet metal parts together in the riveted state, with the rivet holes on the two sheet metal parts overlapping. At this time, the lower surface of the upper sheet metal part is in contact with the upper surface of the lower sheet metal part. ③ Use a soft plug to pass through the two sheet metal parts through the rivet holes on the two sheet metal parts; ④ Spray an insulating layer on the upper surface of the upper sheet metal and the lower surface of the lower sheet metal and around the rivet holes. After the serrated rivets are riveted, both ends of the serrated rivets are pressed tightly against the insulating layer, and there is no electrical connection between the two ends of the serrated rivets and the sheet metal parts. ⑤Remove the soft plug.

3. The integrated traceless processing technology for press riveting and welding of sheet metal parts according to claim 1 or 2, characterized in that: The lower die of the riveting machine is arranged on the working table of the riveting machine, and an insulating support block is arranged between the lower die and the working table.

4. The integrated traceless processing technology for press riveting and welding of sheet metal parts according to claim 3 is characterized in that: The pressing head or the lower die of the riveting machine is provided with a tab connecting portion.

5. The integrated traceless processing technology for press riveting and welding of sheet metal parts according to claim 2 is characterized in that: The insulating layer is annular and is arranged concentrically with the riveting hole.

6. The integrated traceless processing technology for press riveting and welding of sheet metal parts according to claim 5 is characterized in that: The width of the annular ring is 5 mm to 10 mm.

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