Aluminum copper negative pole post static axle shoulder needleless spot welding mechanism

Abstract

The utility model discloses a kind of aluminum copper negative pole static axle shoulder needleless spot welding mechanism, it is related to negative pole production technical field, including the welding assembly and object platform of up-down layout, and welding assembly can be similar or apart from object platform to make similar or apart action downwards;The welding assembly includes the tool shank movable along plumb direction, the spot welding tool fixedly arranged at the bottom end of tool shank and the static axle shoulder welding tool coaxially sleeved in the outside of spot welding tool, and the bottom end of spot welding tool extends downwards and protrudes outside static axle shoulder welding tool, to make the axle shoulder surface of static axle shoulder welding tool face copper sheet and exert static pressure effect.The utility model designs spot welding tool bottom end face protruding on static axle shoulder axle shoulder surface on the basis that copper sheet is not thickened, ensures that rotary friction generates heat and upset pressure can be effectively applied to welding point, and stationary axle shoulder surface can exert downward pressure to copper sheet, so that copper sheet is limited between axle shoulder surface and object platform, effectively suppress its thermal deformation.

Description

Technical Field

[0001] This utility model relates to the field of negative electrode post production technology, specifically to a needleless spot welding mechanism for the static shoulder of an aluminum-copper negative electrode post. Background Technology

[0002] In the process of connecting aluminum and copper negative electrode posts using friction stir spot welding technology, due to the significant differences in the physical properties of aluminum and copper (such as coefficient of thermal expansion and melting point), and the local heat input concentration during welding, the yield strength of the copper sheet decreases at high temperature, and it is very easy to produce plastic deformation due to the coupling effect of axial pressure and thermal stress of the stirring head.

[0003] To suppress this deformation, current processes mainly employ two improvement methods: first, proactively using a thicker copper sheet design to utilize the material's inherent higher rigidity to resist welding stress; second, mechanically straightening the deformed copper sheet after welding. However, both strategies have significant drawbacks: for example, while increasing the copper sheet thickness can alleviate deformation to some extent, it directly increases the raw material cost per unit; and for post-weld straightening, it is a non-value-added process that not only increases additional equipment and labor costs but, more importantly, prolongs the production cycle, becoming a bottleneck restricting capacity expansion and increasing the risk of product quality fluctuations. Utility Model Content

[0004] The purpose of this invention is to solve the problems in the prior art by proposing a needle-free spot welding mechanism for the static shoulder of an aluminum-copper negative electrode post. This spot welding mechanism effectively suppresses thermal deformation of the copper sheet by applying downward pressure during the welding process without thickening the copper sheet, ensuring that the welded negative electrode post blank does not require additional straightening processing, thereby improving production efficiency.

[0005] To solve the above problems, this utility model provides the following technical solution: A needleless spot welding mechanism for the stationary shoulder of an aluminum-copper negative electrode post includes a welding fixture assembly and a carrying platform arranged vertically, and the welding fixture assembly can move downward toward or away from the carrying platform. The welding fixture assembly includes a tool holder that can move vertically, a spot welding fixture fixed at the bottom of the tool holder, and a stationary shoulder welding fixture coaxially sleeved outside the spot welding fixture. The bottom end of the spot welding fixture extends downward and protrudes beyond the stationary shoulder welding fixture, so that the shoulder of the stationary shoulder welding fixture applies static pressure to the copper sheet.

[0006] As a further aspect of this utility model, the distance between the bottom end face of the spot welding tool and the shoulder face of the stationary shoulder welding tool is adjustable.

[0007] As a further aspect of this utility model, the distance between the bottom end face of the spot welding tool and the shoulder face of the stationary shoulder welding tool is between 0.1mm and 0.7mm.

[0008] As a further embodiment of this utility model: the spot welding tool includes an insertion part and a working part arranged in a stepped manner, so that when the insertion part is inserted into the inner cavity of the tool holder to realize the installation of the spot welding tool at the bottom end of the tool holder, the top end of the working part is in contact with the bottom end of the tool holder.

[0009] As a further embodiment of this utility model: a filler can be provided between the top end of the working part and the bottom end of the tool holder to make the distance between the bottom end face of the spot welding tool and the shoulder face of the stationary shoulder welding tool adjustable.

[0010] As a further aspect of this utility model, the filler includes multiple sets of gaskets of different thicknesses.

[0011] As a further embodiment of this utility model: the side of the tool holder is provided with an assembly hole extending into its inner cavity, so that when the plug part at the top of the spot welding tool is inserted into the inner cavity of the tool holder, the assembly hole allows the set screw to be screwed in and abut against the side of the plug part.

[0012] As a further embodiment of this utility model: the top of the tool holder is provided with a bolt that can extend into its inner cavity, so that when the insertion part of the spot welding tool is inserted into the inner cavity of the tool holder, the bolt can abut against the top of the insertion part.

[0013] As a further embodiment of this utility model: the carrying platform includes a carrier and a push rod. The carrier has a through hole arranged vertically. The top end of the push rod is movably inserted into the through hole, and the top end and the through hole together form a placement area for placing aluminum columns. The top end of the through hole has a positioning groove for placing copper sheets. The push rod can push the aluminum column to move upward and make it contact the copper sheets vertically.

[0014] As a further embodiment of this utility model: the mechanism also includes a main spindle for mounting the tool holder, an upper sleeve is rotatably mounted on the outside of the main spindle, and the upper sleeve is coaxially arranged with the main spindle. A lower sleeve is fixedly mounted at the bottom of the upper sleeve, and the lower sleeve is sleeved on the outside of the tool holder. The lower sleeve is used for fixing and mounting the stationary shoulder welding tool.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The spot welding fixture is driven to rotate by a movable tool holder, while the stationary shoulder welding fixture, which is rotated and sleeved outside it, remains relatively stationary. Without thickening the copper sheet, the bottom end face of the spot welding fixture is designed to protrude from the shoulder surface of the stationary shoulder, ensuring that the heat generated by rotational friction and the upsetting pressure can effectively act on the welding point. The stationary shoulder surface can apply downward pressure to the copper sheet, thus confining the copper sheet between the shoulder surface and the platform, effectively suppressing its thermal deformation.

[0016] In summary, using the spot welding mechanism of this application to weld the negative electrode post not only eliminates the need to thicken the copper sheet, saving copper material and reducing costs, but also effectively suppresses thermal deformation of the copper sheet, avoiding the need for additional straightening machining steps, simplifying the production process, saving production time, and improving production efficiency.

[0017] 2. The distance between the bottom face of the spot welding tool and the shoulder face of the stationary shaft can be adjusted. By precisely adjusting this distance (i.e., the pressing amount of the spot welding tool), the upsetting pressure, insertion depth and heat input of the workpiece can be directly controlled. This not only adapts to the processing of copper sheets of different thicknesses, but also optimizes the plastic flow behavior of the material and the quality of the weld point formation.

[0018] 3. The stepped layout of the insertion and working parts of the spot welding fixture enables rapid and precise installation and positioning. The fit between the insertion part and the inner cavity of the tool holder ensures coaxiality. Furthermore, the contact between the top of the working part and the bottom of the tool holder creates a reliable axial mechanical limiting reference. This reference surface provides a fixed reference point for the installation of the spot welding fixture, allowing any subsequent adjustments to the extension of the fixture to be made on this basis, thus improving the repeatability of parameter settings and the process stability of the equipment.

[0019] 4. By placing filler between the top of the working part and the bottom of the tool holder, the axial position of the spot welding fixture can be adjusted, thereby adjusting the distance between the bottom surface of the spot welding fixture and the shoulder surface of the stationary shoulder welding fixture. Furthermore, multiple sets of shims of different thicknesses can be provided, allowing operators to select different thicknesses or combine them, offering flexible usage options.

[0020] 5. When the top of the working part is in contact with the bottom of the tool holder, the side locking of the set screw through the assembly hole and the top locking of the threaded contact with the top of the insertion part can improve the connection strength of the spot welding tool on the tool holder and enhance the rigidity and stability of the welding tool assembly in the working state.

[0021] 6. The combination design of pushing the aluminum column with the positioning groove at the top of the carrier through hole to place the copper sheet achieves precise positioning of the copper sheet and aluminum column. The push rod can actively push the aluminum column upward to stably resist the copper sheet, ensuring that the two workpieces are in close contact at the initial moment of welding, providing a stable support environment for the welding process.

[0022] 7. Through the combined structure of the upper and lower parts of the bushing, the stationary shoulder welding tool is fixed to the lower part of the bushing, while the tool holder that drives the spot welding tool to rotate rotates independently inside it under the drive of the spindle, ensuring that the stationary shoulder can stably press against the workpiece surface during the welding process without rotating with it. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 This is a front view structural diagram of the present invention; Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure along line AA; Figure 3 This is a cross-sectional view of the cargo platform in this utility model; Figure 4 This is a cross-sectional view of the static shoulder welding tool and the spot welding tool in this utility model; Figure 5 This is a front view structural diagram of the welding fixture assembly in this utility model; Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure along line BB; Figure 7 yes Figure 6 A schematic diagram of a local structure in the image; Figure 8 This is a three-dimensional structural diagram of the welding fixture assembly in this utility model; Figure 9 This is a three-dimensional structural diagram of the spot welding fixture in this utility model; Figure 10 This is a front view schematic diagram of the negative electrode post of this utility model.

[0025] In the picture: 1. Welding fixture assembly; 101. Tool holder; 102. Spot welding fixture; 103. Static shoulder welding fixture; 1031. Shoulder face; 104. Spindle; 2. Cargo platform; 201. Carrier; 202. Push rod; 3. Filler; 4. Assembly holes; 5. Bolts; 6. The bushing is split into two parts; 7. Lower part of the bushing; a. Copper sheet; b. Aluminum column. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] This application is based on the principle that the copper sheet a in the aluminum-copper negative electrode post is not thickened. In use, the spot welding mechanism of this application is used to weld the copper sheet a and the aluminum post b. During the welding process, the spot welding mechanism can also straighten the copper sheet a, which may deform, so that the copper sheet a in the final welded aluminum-copper negative electrode post is flat. Using the spot welding mechanism of this application to weld the negative electrode post not only saves copper material but also effectively suppresses the thermal deformation of the copper sheet a, avoiding the need for subsequent additional straightening machining steps, simplifying the production process, saving production time, and improving production efficiency. The spot welding mechanism of this application is described below: like Figures 1-4 As shown, a needle-free spot welding mechanism for the stationary shoulder of an aluminum-copper negative electrode post includes a welding fixture assembly 1 and a carrying platform 2 arranged vertically. The carrying platform 2 is used to place the copper sheet a and aluminum post b to be welded. The welding fixture assembly 1 is located above the carrying platform 2 and can move downward toward the carrying platform 2. When the copper sheet a and aluminum post b to be welded are placed on the carrying platform 2, Figure 4 The diagram shows a copper sheet a above and an aluminum column b below. This allows the welding fixture assembly 1 to be driven downwards toward the platform 2 until the spot welding fixture 102 in the welding fixture assembly 1 contacts the copper sheet a above, thus achieving welding. At the same time, during this welding process, the coordinated movement of the welding fixture assembly 1 and the platform 2 allows for static pressure straightening of the copper sheet a that deforms during welding.

[0028] The loading platform 2 includes a carrier 201 and a push rod 202. The carrier 201 has a through hole arranged vertically. The top end of the push rod 202 is movably inserted into the through hole, and this top end, together with the through hole, forms a placement area for placing the aluminum column b. A positioning groove for placing the copper sheet a is provided at the top end of the through hole. Under the upward driving action of a driving source (cylinder, etc.), the push rod 202 can push the aluminum column b upward, causing it to be in vertical contact with the copper sheet a. This contact state can be... Figure 4 To represent it.

[0029] like Figures 5-6 As shown, the welding fixture assembly 1 includes a spindle 104, on which a tool holder 101 is mounted. A spot welding fixture 102 is fixedly mounted at the bottom of the tool holder 101. Therefore, the up-and-down movement and rotation of the spindle 104 can drive the spot welding fixture 102 to move accordingly. Furthermore, the welding fixture assembly 1 also includes a stationary shoulder welding fixture 103. The stationary shoulder welding fixture 103 is rotatably mounted on the spindle 104 by means of an adapter, and is sleeved outside the spot welding fixture 102. When the spindle 104 drives the spot welding fixture 102 to rotate at high speed, the stationary shoulder welding fixture 103 does not move and remains stationary. When the spindle 104 drives the spot welding fixture 102 to move up and down, the stationary shoulder welding fixture 103 moves up and down accordingly.

[0030] For example Figures 5-6 As shown, the adapter includes a bushing split 6 that is rotatably disposed outside the spindle 104. The bushing split 6 is coaxially arranged with the spindle 104. A lower bushing split 7 is fixedly installed at the bottom of the bushing split 6 and is sleeved outside the tool holder 101. The lower bushing split 7 is used for the fixed installation of the stationary shoulder welding tool 103.

[0031] Furthermore, the bottom end face of the spot welding fixture 102 extends out of the inner cavity of the stationary shoulder welding fixture 103, and the bottom end face of the spot welding fixture 102 is located below the shoulder surface 1031 of the stationary shoulder welding fixture 103. This state can be achieved by... Figure 7 The distance between the bottom surface of the spot welding fixture 102 and the shoulder surface 1031 of the stationary shoulder welding fixture 103 can be represented by d. By setting the value of d to be adjustable, it can adapt to the processing of copper sheets a of different thicknesses. Since the welding process requirements of copper sheets a of different thicknesses are different, when a certain welding process requires a large amount of heat and a large depth, the value of d can be adjusted to match the current welding process.

[0032] Meanwhile, d is between 0.1mm and 0.7mm, with a preferred value of 0.3mm. Under normal circumstances, the more the spot welding fixture 102 protrudes downward, the more pressure is distributed on the spot welding fixture 102, and the greater the frictional heat generation.

[0033] like Figure 4As shown, before welding, the bottom surface of the spot welding fixture 102 is located below the shoulder surface 1031 of the stationary shoulder welding fixture 103. Then, the high-speed rotating spindle 104 moves downward, which drives the spot welding fixture 102 and the stationary shoulder welding fixture 103 to move downward synchronously until the bottom surface of the spot welding fixture 102 first contacts the copper sheet a below. The high-speed rotation of the spot welding fixture 102 can heat up the copper sheet a and soften the contact part between the copper sheet a and the spot welding fixture 102, keeping the spindle 104 moving downward. As the aluminum column b is pushed upward by the push rod 202 below, the downward trend of the main shaft 104 and the upward pushing action of the push rod 202 will cause the bottom end of the spot welding tool 102 to penetrate into the copper sheet a to a certain depth until the shoulder surface 1031 of the stationary shoulder welding tool 103 touches the copper sheet a. The shoulder surface 1031 will apply a uniform downward pressure to the copper sheet a. This downward pressure can apply a uniform downward pressure to the copper sheet a, effectively suppressing the thermal deformation of the copper sheet a. Meanwhile, the heat from copper plate a is conducted to the aluminum column b below, causing melting at the contact point between aluminum column b and copper plate a. As push rod 202 continuously pushes aluminum column b upwards, its length gradually decreases. When it reaches a specified length (the type of negative terminal corresponding to this specified length is pre-designed; specifically, it can be aligned with the corresponding positioning component by the upward movement of a portion of push rod 202 to trigger the positioning signal), spindle 104 stops rotating, but continues to maintain its position. The downward trend of 04 and the upward pushing action of push rod 202, maintaining this action for a certain period of time (between 0.5s and 10s, preferably 5s), cause the molten aluminum between aluminum column b and copper sheet a to cool and solidify due to continuous cooling. This welds aluminum column b and copper sheet a into a negative electrode blank. At this time, the main shaft 104 moves upward, causing the spot welding tool 102 and the stationary shoulder welding tool 103 to detach from the surface of the negative electrode blank, thus completing the welding. The negative electrode blank after welding can then be... Figure 10 To represent it.

[0034] like Figure 9 As shown, for the assembly of the spot welding tool 102 on the tool holder 101, the spot welding tool 102 can be configured to include a stepped insertion part 1021 and a working part 1022. The insertion part 1021 and the working part 1022 are coaxially arranged, and the diameter of the insertion part 1021 is smaller than the diameter of the working part 1022. During installation, the insertion part 1021 is inserted into the inner cavity of the tool holder 101, and the top end of the working part 1022 is in contact with the bottom end of the tool holder 101. Subsequently, the insertion part 1021 is locked on the tool holder 101, thereby realizing the installation of the spot welding tool 102 on the bottom end of the tool holder 101.

[0035] For locking the position of the insertion part 1021 on the tool holder 101, any locking technique in the prior art can be used. This application proposes a locking method, as follows: (1) such as Figure 8 As shown, a mounting hole 4 extending into the inner cavity is provided on the side of the tool holder 101, such as... Figure 9 As shown, the side of the plug portion 1021 is provided with a plane arranged along its length direction, so that when the plug portion 1021 at the top of the spot welding tool 102 is inserted into the inner cavity of the tool holder 101, the assembly hole 4 allows the set screw to be screwed in and abut against the plane of the side of the plug portion 1021, thereby realizing the side locking of the plug portion 1021.

[0036] (2) For example Figure 6 As shown, a bolt 5 that can extend into the inner cavity is provided at the top of the tool holder 101, so that when the insertion part 1021 at the top of the spot welding tool 102 is inserted into the inner cavity of the tool holder 101, the bolt 5 can abut against the top of the insertion part 1021, thereby achieving top locking of the insertion part 1021.

[0037] When the top end of the aforementioned working part 1022 abuts against the bottom end of the tool holder 101, the two end faces together form a positioning end face. In summary, with the positioning end face present, combined with the aforementioned side locking and top locking functions, the connection strength of the spot welding tool 102 on the tool holder 101 can be improved, ensuring assembly stability.

[0038] like Figure 7 As shown, to achieve adjustable distance between the bottom surface of the spot welding tool 102 and the shoulder surface 1031 of the stationary shoulder welding tool 103, conventional techniques in the prior art can be used, such as changing the insertion depth of the spot welding tool 102 on the tool holder 101, or setting the spot welding tool 102 as telescopic. Based on the aforementioned spot welding tool 102 being configured as an insertion part 1021 and a working part 1022, this application proposes the following adjustment method: a filler 3 can be provided between the top end of the working part 1022 and the bottom end of the tool holder 101. The thickness of the filler 3 can be varied according to actual conditions, thereby achieving adjustment of the distance between the bottom surface of the spot welding tool 102 and the shoulder surface 1031 of the stationary shoulder welding tool 103 at different thicknesses.

[0039] Preferably, the filler 3 is configured as multiple sets of shims of different thicknesses. One of these shims can be selectively placed between the top of the working part 1022 and the bottom of the tool holder 101. The presence of shims of different thicknesses changes the distance between the top of the working part 1022 and the bottom of the tool holder 101, thereby changing the length of the bottom of the spot welding fixture 102 extending out of the inner cavity of the stationary shoulder welding fixture 103, thus adjusting the distance between the bottom surface of the spot welding fixture 102 and the shoulder surface 1031 of the stationary shoulder welding fixture 103. Of course, in actual use, the multiple sets of shims can be used in various ways; for example, two sets of shims of different thicknesses can be placed simultaneously between the top of the working part 1022 and the bottom of the tool holder 101, as long as the corresponding adjustment requirements are met.

[0040] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A needle-free spot welding mechanism for the stationary shoulder of an aluminum-copper negative electrode post, characterized in that, It includes a welding fixture assembly (1) arranged vertically and a loading platform (2), and the welding fixture assembly (1) can move downward toward or away from the loading platform (2); The welding fixture assembly (1) includes a tool holder (101) that can move vertically, a spot welding fixture (102) fixed at the bottom of the tool holder (101), and a stationary shoulder welding fixture (103) coaxially sleeved outside the spot welding fixture (102). The bottom end of the spot welding fixture (102) extends downward and protrudes out of the stationary shoulder welding fixture (103) so that the shoulder surface (1031) of the stationary shoulder welding fixture (103) applies static pressure to the copper sheet (a).

2. The needle-free spot welding mechanism for the stationary shoulder of an aluminum-copper negative electrode post according to claim 1, characterized in that, The distance between the bottom end face of the spot welding tool (102) and the shoulder face (1031) of the stationary shoulder welding tool (103) is adjustable.

3. The needle-free spot welding mechanism for the stationary shoulder of an aluminum-copper negative electrode post according to claim 2, characterized in that, The distance between the bottom end face of the spot welding tool (102) and the shoulder face (1031) of the stationary shoulder welding tool (103) is between 0.1 mm and 0.7 mm.

4. A needle-free spot welding mechanism for the stationary shoulder of an aluminum-copper negative electrode post according to any one of claims 1-3, characterized in that, The spot welding tool (102) includes a stepped insertion part (1021) and a working part (1022) so that when the insertion part (1021) is inserted into the inner cavity of the tool holder (101) to install the spot welding tool (102) at the bottom end of the tool holder (101), the top end of the working part (1022) is in contact with the bottom end of the tool holder (101).

5. The needle-free spot welding mechanism for the stationary shoulder of an aluminum-copper negative electrode post according to claim 4, characterized in that, A filler (3) can be provided between the top of the working part (1022) and the bottom of the tool holder (101) to make the distance between the bottom surface of the spot welding tool (102) and the shoulder surface (1031) of the stationary shoulder welding tool (103) adjustable.

6. The needle-free spot welding mechanism for the stationary shoulder of an aluminum-copper negative electrode post according to claim 5, characterized in that, The filler (3) includes multiple sets of pads of different thicknesses.

7. The needle-free spot welding mechanism for the stationary shoulder of an aluminum-copper negative electrode post according to claim 4, characterized in that, The side of the tool holder (101) is provided with an assembly hole (4) extending into its inner cavity, so that when the plug part (1021) at the top of the spot welding tool (102) is inserted into the inner cavity of the tool holder (101), the assembly hole (4) allows the set screw to be screwed in and abut against the side of the plug part (1021).

8. The needle-free spot welding mechanism for the stationary shoulder of an aluminum-copper negative electrode post according to claim 7, characterized in that, The top of the handle (101) is provided with a bolt (5) that can extend into its inner cavity, so that when the plug part (1021) at the top of the spot welding tool (102) is inserted into the inner cavity of the handle (101), the bolt (5) can abut against the top of the plug part (1021).

9. A needle-free spot welding mechanism for the stationary shoulder of an aluminum-copper negative electrode post according to any one of claims 1-3, characterized in that, The loading platform (2) includes a carrier (201) and a push rod (202). The carrier (201) has a through hole arranged vertically. The top end of the push rod (202) is movably inserted into the through hole, and the top end and the through hole together form a storage area for placing the aluminum column (b). The top end of the through hole has a positioning groove for placing the copper sheet (a). The push rod (202) can push the aluminum column (b) to move upward and make it in contact with the copper sheet (a) from top to bottom.

10. A needle-free spot welding mechanism for the stationary shoulder of an aluminum-copper negative electrode post according to any one of claims 1-3, characterized in that, The mechanism also includes a spindle (104) for mounting the tool holder (101), an upper sleeve (6) is rotatably mounted on the outside of the spindle (104), and the upper sleeve (6) is coaxial with the spindle (104). A lower sleeve (7) is fixedly mounted at the bottom of the upper sleeve (6), and the lower sleeve (7) is sleeved on the outside of the tool holder (101). The lower sleeve (7) is used for fixing the stationary shoulder welding tool (103).

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