A high-frequency welding overlap positioning device for aluminum parts

Abstract

The present invention relates to the technical field of welding tooling, and specifically to a high-frequency welding overlap positioning device for aluminum parts, comprising a carrier and a jig, wherein the carrier is made of graphite; the jig is fixed to the upper end of the carrier, and has a plurality of rectangular recesses for placing the parts to be welded; wherein, when the parts to be welded are placed on the recesses, the bottom and side end faces of the parts to be welded are respectively in contact with the upper end of the carrier and the right-angle end faces of the recesses, and the end faces of the recesses in contact with the parts to be welded are wavy, and the crests of the recesses conflict with the end faces of the parts to be welded. The present invention improves the heat dissipation efficiency by using a carrier made of graphite material, utilizes its high thermal conductivity to quickly conduct welding heat, and reduces the deformation of aluminum parts caused by high temperature; by providing a wavy recess, the contact area between the recess and the parts to be welded can be reduced, preventing the parts to be welded from being adhered to a large area due to heat.

Description

Technical Field

[0001] The invention relates to the technical field of welding tooling, and in particular to a high-frequency welding overlap positioning device for aluminum parts. Background Art

[0002] In the high-frequency welding process of aluminum parts, the accuracy and stability of overlap positioning directly affect the welding quality.

[0003] In the prior art, for example, there is a Chinese utility model patent with the patent number CN217193625U, entitled "A high-precision welding positioning auxiliary device." Specifically, the patent discloses a base, a first fixing assembly, and a second fixing assembly. The second fixing assembly includes a U-shaped bottom plate, a rotating shaft rotatably connected to the top of the U-shaped bottom plate, a second clamping member fixedly connected to the top of the rotating shaft, a worm gear fixedly sleeved on the outer side of the rotating shaft, a worm gear driven on the outer side of the worm gear, one end of the worm gear rotatably connected to the inner wall of the U-shaped bottom plate, and the other end of the worm gear fixedly connected to the output shaft of a first servo motor, which is fixed to the top of the U-shaped bottom plate. This utility model drives the fixed parts on the first clamping member to rotate, and then moves the second clamping member toward the first clamping member to abut the welding ends, thereby adjusting and fixing the welding angle of the two parts, making welding more precise and improving the applicability of the technical solution.

[0004] However, the above solution uses a U-shaped base plate and worm gear to adjust the clamping angle. This clamping method is prone to adhesion when the aluminum parts are exposed to high temperatures. Moreover, since it is a manual operation, if the weldment is not removed in time, it will be even more difficult to remove the adhered parts after they cool down, resulting in low overall welding efficiency.

[0005] Another example is the Chinese invention patent with announcement number CN110732822A, and the patent name is a positioning device for aluminum welding, which specifically discloses a pair of lower support hydraulic cylinders respectively arranged on the left and right parts of the bottom support frame, the cylinder barrels of the lower support hydraulic cylinders are fixedly installed inside the bottom support frame, the piston rods of the pair of lower support hydraulic cylinders can slidably pass through the bottom support frame and are fixedly connected to a pair of bottom support plates on the upper part of the bottom support frame; the upper support frame is fixedly connected to the top of the bottom support frame; a pair of upper support hydraulic cylinders are fixedly connected to the upper support frame, and are respectively arranged corresponding to the pair of lower support hydraulic cylinders, the piston rod ends of the pair of upper support hydraulic cylinders are both arranged downward, and are fixedly connected to a pair of top pressure plates matching the pair of bottom hand plates; a pair of cooling pipes are connected to the inner sides of the pair of top pressure plates, the water outlet of the cooling pipes is arranged downward, and is connected to an atomizing nozzle, and the water inlet of the cooling pipes is connected to the water source through a hose.

[0006] The above solution uses hydraulic cylinder clamping and is equipped with cooling pipes, but the structure is complex and the heat dissipation efficiency is limited by the atomizing nozzle design. It cannot solve the problem of fixture adhesion caused by the rapid heat conduction of aluminum.

[0007] Therefore, a high-frequency welding overlap positioning device for aluminum parts is needed to solve the above problems. Summary of the Invention

[0008] Technical problems solved

[0009] In view of the above-mentioned shortcomings of the prior art, the present invention provides a high-frequency welding overlap positioning device for aluminum parts, which can effectively solve the problem in the prior art that the welding fixture is prone to adhesion to the weldment.

[0010] Technical Solution

[0011] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0012] The present invention provides a high-frequency welding overlap positioning device for aluminum parts, comprising a carrier and a jig, wherein the carrier is made of graphite; the jig is fixed to the upper end of the carrier, and has a plurality of rectangular recesses for placing parts to be welded; wherein, when the parts to be welded are placed on the recesses, the bottom and side end faces of the parts to be welded are respectively in contact with the upper end of the carrier and the right-angle end faces of the recesses, and the end faces of the recesses in contact with the parts to be welded are wavy, and the crests of the recesses conflict with the end faces of the parts to be welded.

[0013] Furthermore, the fixture is rectangular, and each of its four corner ends is provided with a notch.

[0014] Furthermore, the areas of the four notches are different.

[0015] Furthermore, the jig is made of steel, and a nitride layer is formed on the end surface of the jig after gas nitriding treatment.

[0016] Furthermore, an air passage communicating with the external air is provided in the fixture, and a ventilation hole communicating with the air passage is provided at the trough of the notch.

[0017] Furthermore, a ventilation slot communicating with the end of the airway is provided in the carrier, and the ventilation slot and the airway are separated by a filter.

[0018] Furthermore, a windproof shell is provided in the airway and at the rear side of the notch trough to prevent the air in the airway from entering, a partition is provided on the top of the windproof shell, and the bottom of the windproof shell is connected to the airflow inside the airway and is spaced apart from the filter.

[0019] Furthermore, the end surface of the windproof shell on the side away from the workpiece to be welded is tilted toward the side away from the workpiece to be welded.

[0020] Furthermore, an inner cavity with a bottom communicating with the air flow inside the airway is provided in the windproof outer shell and below the partition.

[0021] Furthermore, a vent communicating with the interior of the inner cavity is provided at the upper portion of the inner cavity and below the partition. A valve plate that can rotate toward one side of the vent is elastically hinged on the partition. When the valve plate rotates, the vent communicates with the gas inside the airway.

[0022] Beneficial effects

[0023] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0024] The present invention improves heat dissipation efficiency by using a graphite carrier, and utilizes its high thermal conductivity to quickly dissipate welding heat, thereby reducing deformation of aluminum parts caused by high temperature.

[0025] The wave-shaped notch can reduce the contact area between the welded parts and the welded parts, thus preventing the welded parts from being adhered to a large area due to heat.

[0026] The fixture is equipped with notches of different areas at the four corners, which can simultaneously fix aluminum parts of different sizes, improving the versatility of the device;

[0027] The steel fixture is treated with gas nitriding to form a surface nitride layer, which improves wear resistance and reduces damage to the notch caused by welding spatter;

[0028] A directional airflow channel is formed through air ducts, ventilation holes and ventilation slots, and metal splashes are filtered out in combination with filters to avoid blockage of the heat dissipation channel;

[0029] The windproof shell cooperates with the valve plate to adjust the amount of input wind force according to the welding temperature. When the wind force is sufficient to drive the valve plate to rotate, the vent opening and closing are adjusted to improve the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0031] Figure 1 This is an overall schematic diagram of a positioning device in an embodiment of the present invention;

[0032] Figure 2 A schematic top view of a fixture structure in an embodiment of the present invention;

[0033] Figure 3 A schematic side view of a fixture structure in an embodiment of the present invention;

[0034] Figure 4 In the embodiment of the present invention Figure 3Schematic diagram of the structure at A in the middle;

[0035] Figure 5 A schematic side cross-sectional view of an airway structure in an embodiment of the present invention;

[0036] Figure 6 In the embodiment of the present invention Figure 5 Schematic diagram of the structure at B in the middle;

[0037] Figure 7 A partial schematic diagram of a fixture structure in an embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the windproof housing structure in an embodiment of the present invention;

[0039] Figure 9 Schematic diagram of the airflow path inside the windproof housing (valve plate closed state) in an embodiment of the present invention;

[0040] Figure 10 Schematic diagram of the air flow path inside the windproof housing (valve plate rotating state) in an embodiment of the present invention.

[0041] The numbers in the figure represent:

[0042] 1. Carrier; 11. Ventilation slot; 12. Filter; 2. Fixture; 21. Recess; 211. Ventilation hole; 22. Airway; 221. Windproof shell; 222. Partition; 223. Inner cavity; 224. Vent; 225. Valve plate. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0044] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0045] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0046] In the description of this embodiment, the terms "upper," "lower," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0047] The present invention will be further described below with reference to the embodiments.

[0048] Example:

[0049] See attached Figure 1-10 , this case proposes a high-frequency welding overlap positioning device for aluminum parts, including a carrier 1 and a fixture 2. Since high heat is generated during welding, the carrier 1 used to support the workpiece is made of graphite;

[0050] like Figure 1 As shown, the carrier 1 is formed by processing a whole piece of graphite, and the fixture 2 is fixed to the upper surface of the carrier 1 by bolts. The material of the fixture 2 is steel, and a nitride layer is formed on the surface after gas nitriding treatment.

[0051] A notch 21 is provided at each of the four corners of the fixture 2. The depth of the four notches 21 is the same, but the opening area increases in increments of 10mm², 15mm², 20mm², and 25mm² to accommodate aluminum parts of different specifications.

[0052] In this embodiment, the two parts to be welded are distributed vertically. When the parts to be welded are placed on the recess 21, the bottom and side end faces of the parts to be welded are respectively in contact with the upper end of the carrier 1 and the right-angle end face of the recess 21. It should be noted that before welding, it is necessary to ensure that the end faces of the two parts to be welded are in close contact with the right-angle end face of the recess 21.

[0053] During welding, since aluminum and copper will inevitably have a certain degree of stickiness when heated, traditionally, the parts are directly attached to the graphite carrier 1. Due to the large contact area, adhesion is inevitable. Therefore, the end face of the recess 21 in this embodiment that contacts the part to be welded is wavy, and its wave crest conflicts with the end face of the part to be welded, so that the contact area between the recess 21 and the part to be welded is smaller, reducing the degree of adhesion.

[0054] like Figure 2 As shown, the inner end surface of the recess 21 is processed into a wave shape, the height difference of the wave crest is 0.5 mm, and a ventilation hole 211 is opened at the wave trough.

[0055] It should be noted that in order to further improve the heat dissipation effect, a through air duct 22 is pre-buried inside the jig 2 and at each recess 21, and the ventilation holes 211 are connected to the air duct 22. When in use, since the trough is not in direct contact with the workpiece to be welded, an air flow channel is formed between the workpiece to be welded and the jig 2 through these ventilation holes 211, thereby enhancing natural convection heat dissipation, that is, the heat generated at the workpiece to be welded will enter the inside of the jig 2 through the air flow channel, while reducing heat accumulation in the material.

[0056] The bottom of the carrier 1 is provided with ventilation slots 11. There are several ventilation slots 11, which are arranged at intervals along one side of the workpiece to be welded. The air outlet of the ventilation slots 11 passes through the carrier 1, and the air flow inside the fixture 2 is discharged to the outside through the ventilation slots 11. In the process of air flow passing through, the heat on the upper end surface of the carrier 1 will also be dissipated. The end of the air duct 22 is connected to the ventilation slots 11 through the filter 12.

[0057] Specifically, during welding, gas (cold air flow) is input from top to bottom into the air duct 22 through air-generating equipment such as fans and blowers. The gas will pass through the back of the wave crest that is in contact with the workpiece to be welded, and the heat generated by the contact at the wave crest is dissipated through gas circulation, so that the temperature of the contact surface between the wave crest and the workpiece to be welded is lower than that of other processed parts, further reducing the possibility of adhesion.

[0058] It is worth mentioning that, referring to the Figure 9-10, since the trough is for the hot air flow between the weldment and the jig 2 to enter the inside of the jig 2, in this embodiment, in order to prevent the top airflow from entering the inside of the jig 2 and interfering with the hot air flow entering the trough through the ventilation hole 211, in this embodiment, a windproof shell 221 is welded at a position near the notch 21 in the air duct 22, and a layer of partition 222 is provided on the top of the windproof shell 221. The partition 222 can block the airflow input from top to bottom. This part of the airflow will enter the air duct 22 from two directions, first, it will flow between the windproof shell 221 and the inner wall of the air duct 22. Since the bottom of the air duct 22 is connected to the ventilation slot 11 in the carrier 1, the gas will flow from top to bottom until it flows out from the ventilation slot 11, ensuring that the temperature of the contact part of the wave peak will not be very high, avoiding the adhesion phenomenon caused by the height.

[0059] It should be noted that the bottom of the windproof shell 221 is in communication with the air flow inside the air duct 22 and is spaced apart from the filter 12 .

[0060] That is, the bottom of the windproof shell 221 is still a certain distance away from the filter 12, and the hot air entering the windproof shell 221 through the trough will gather inside the windproof shell 221. When the air flow passes through the windproof shell 221 and the inner wall of the air duct 22, negative pressure will be generated when passing through the bottom of the windproof shell 221, and the air flow inside the windproof shell 221 will be discharged synchronously.

[0061] The end surface of the windproof housing 221 away from the workpiece to be welded is tilted toward the side away from the workpiece to be welded, and the tilted surface forms an angle of 30° with the horizontal direction.

[0062] A partition 222 is fixed on the top of the windproof outer shell 221, and its interior is hollow to form an inner cavity 223, and a vent 224 is provided under the partition 222, and the valve plate 225 is hinged to the edge of the partition 222 by a torsion spring. Under normal circumstances, the valve plate 225 is closed by the torsion spring to close the vent 224; when the high temperature of welding causes the temperature in the air duct 22 to rise, the heat dissipation effect can be improved by increasing the air flow rate, and because the side wall thickness of the inner cavity 223 is relatively thin, when the air flow flows, it will increase the flow rate and also have a good heat dissipation effect on the windproof outer shell 221, and can discharge the heat inside it in time. Under normal circumstances, the main function of the airflow is to ensure that the temperature behind the crest is relatively low, and only when the heat at the trough is too high, the rotation of the valve plate 225 is triggered by increasing the air flow rate.

[0063] When the increased airflow is sufficient to overcome the hinge spring force of the valve plate 225, as shown in the attached Figure 10 As shown, the airflow pushes the valve plate 225 to rotate and open the vent 224 , allowing a portion of the airflow to flow out through the inner cavity 223 to the bottom of the windproof housing 221 .

[0064] The methods of generating airflow, collecting internal temperature and welding are well-known technologies and will not be described in detail here.

[0065] It is worth noting that there is a gap between adjacent windproof shells 221. The part in contact with the welded part, i.e., the rear side of the crest, is located between adjacent windproof shells 221. Part of the airflow entering from the top will flow through the gap.

[0066] When in use, the aluminum piece is placed in the recess 21 of corresponding size, with the bottom surface of the aluminum piece fitting against the carrier 1 and the side wall tightly contacting the wave surface (wave crest) of the recess 21 .

[0067] During high-frequency welding, the graphite carrier 1 quickly dissipates heat, and at the same time, the hot air generated in the welding area enters the air duct 22 through the ventilation holes 211. When the local temperature exceeds the set threshold, the valve plate 225 opens under the action of air pressure, accelerating the air circulation and avoiding heat accumulation.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A high-frequency welding overlap positioning device for aluminum parts, characterized in that: include: A carrier (1), wherein the carrier (1) is made of graphite; A jig (2), the jig (2) being fixed to the upper end of the carrier (1), and having a plurality of rectangular notches (21) for placing parts to be welded; When the workpiece to be welded is placed on the notch (21), the bottom and side end faces of the workpiece to be welded are respectively in contact with the upper end of the carrier (1) and the right-angle end face of the notch (21), and the end face of the notch (21) in contact with the workpiece to be welded is wavy, and the crest of the wave contacts the end face of the workpiece to be welded; An air passage (22) communicating with the outside air is provided in the fixture (2), and a ventilation hole (211) communicating with the air passage (22) is provided at the trough of the notch (21); A ventilation slot (11) communicating with the end of the airway (22) is provided in the carrier (1), and the ventilation slot (11) and the airway (22) are separated by a filter (12); A windproof outer shell (221) is provided in the air duct (22) and at the rear side of the trough of the notch (21) to prevent the air in the air duct (22) from entering. A partition (222) is provided on the top of the windproof outer shell (221), and the bottom of the windproof outer shell (221) is in communication with the air flow inside the air duct (22) and is spaced apart from the filter (12). The windproof housing (221) has an end surface on a side away from the workpiece to be welded that is tilted toward the side away from the workpiece to be welded; An inner cavity (223) whose bottom is in communication with the air flow inside the air duct (22) is provided in the windproof outer shell (221) and below the partition (222); A vent (224) communicating with the interior of the inner cavity (223) is provided at the upper portion of the inner cavity (223) and below the partition (222). A valve plate (225) is elastically hinged on the partition (222) and can rotate toward one side of the vent (224). When the valve plate (225) rotates, the vent (224) communicates with the gas inside the airway (22).

2. The high-frequency welding overlap positioning device for aluminum parts according to claim 1, characterized in that: The jig (2) is rectangular in shape, and each of its four corner ends is provided with a notch (21).

3. The high-frequency welding overlap positioning device for aluminum parts according to claim 2, characterized in that: The areas of the four notches (21) are different.

4. The high-frequency welding overlap positioning device for aluminum parts according to claim 1, characterized in that: The jig (2) is made of steel, and a nitrided layer is formed on the end surface of the jig (2) after gas nitriding treatment.

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