Spot welding machine electrode tip grinding device and method

Abstract

The present invention relates to a spot welding machine electrode tip grinding device and method, comprising a positioning mechanism and a grinding mechanism, wherein the positioning mechanism is composed of a locking nut, an upper fixing block, a sliding rod, a lower fixing block, and a clamping barrel; the grinding mechanism is composed of an upper shell, a lower shell, a fixing seat, a blade, a bearing, an air motor, a hand pressure valve, a rotating cylinder, a first gear, and a second gear; the positioning mechanism is arranged on the upper and lower electrode arms of the spot welding machine, and the grinding mechanism can slide up and down along the positioning mechanism to complete the coaxial grinding of the upper and lower electrode tips. The beneficial effects are as follows: the device of the invention uses the positioning mechanism to make the rotation center of the grinding mechanism blade coincide with the center line of the upper and lower electrode tips of the spot welding machine. The high stability of the positioning mechanism can effectively improve the grinding quality of the electrode tip, thereby improving the welding quality and stability. The overall structure is simple, easy to operate and use, and the manufacturing cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of resistance spot welding, and in particular to a device and method for grinding an electrode tip of a spot welding machine. Background Art

[0002] Resistance spot welding is one of the most widely used joining technologies in the automotive manufacturing industry, offering advantages such as high joint quality, high production efficiency, minimal auxiliary processes, and ease of automation. During the continuous resistance spot welding process, the electrode tip surface can lose material due to mechanical friction or alloying reactions, changing the shape of the electrode tip end face, thereby increasing the contact surface diameter. Alternatively, high welding temperatures and molten metal splashing onto the electrode tip surface can form an oxide layer, reducing welding current density and insufficient heating, leading to defects such as cold welds and reduced weld strength, thus affecting weld quality. The quality of spot welding machine grinding directly impacts weld quality stability, weld quality, and manufacturing cost reduction. The surface condition of the electrode tip directly impacts weld quality, welding stability, and manufacturing cost.

[0003] At present, most commonly used electrode grinders are handheld and are greatly affected by human factors. It is difficult to ensure that the rotation axis of the grinding blade coincides with the axis of the electrode heads on both sides by manual holding, resulting in the end faces of the two electrode heads after grinding being non-parallel, that is, the end faces are not standard circles, which in turn causes the shape and contact area of ​​the actual contact surface between the electrode head and the metal surface to deviate from the theoretical value, ultimately resulting in a deviation between the actual welding effect and the theoretical value, affecting the welding quality and welding stability. Summary of the Invention

[0004] In order to overcome the defects of the existing technology, the technical problem solved by the present invention is to provide a spot welding machine electrode head grinding device and method. Through the positioning mechanism, the rotation center of the grinding mechanism blade is made to coincide with the center line of the upper electrode head and the lower electrode head of the spot welding machine. The high stability of the positioning mechanism can effectively improve the grinding quality of the electrode head, thereby improving the welding quality and stability. The overall structure is simple, easy to operate and use, and the manufacturing cost is low.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A spot welding machine electrode tip grinding device, comprising a positioning mechanism and a grinding mechanism, characterized in that the positioning mechanism is composed of a locking nut, an upper fixing block, a sliding rod, a lower fixing block and a collet, wherein the locking nut, collet and upper fixing block are sequentially sleeved on the upper electrode arm, and the locking nut is threadedly connected and fastened to a connecting neck provided on the upper fixing block; the locking nut, collet and lower fixing block are sequentially sleeved on the lower electrode arm, and the locking nut is threadedly connected and fastened to a connecting neck provided on the lower fixing block; four sliding rods are provided between the upper fixing block and the lower fixing block;

[0007] The grinding mechanism is composed of an upper shell, a lower shell, a fixed seat, a blade, a bearing, an air motor, a hand pressure valve, a rotating drum, a first gear and a second gear, wherein there are two bearings, the inner diameters of the two bearings are respectively connected with the outer diameter of the rotating drum by interference fit and are located at the two ends of the rotating drum, the outer diameter of one bearing is connected with the inner diameter of the upper shell by interference fit, and the outer diameter of the other bearing is connected with the inner diameter of the lower shell by interference fit; the second gear is sleeved on the rotating drum and is arranged near the lower part of the rotating drum, the first gear is arranged at the end of the output shaft of the air motor and meshes with the second gear, and the hand pressure valve is arranged on the air inlet end of the air motor; the fixed seat and the blade are in two sets, respectively arranged at the two ends of the rotating drum; the upper shell and the lower shell are sleeved on the air motor;

[0008] The grinding mechanism is connected to the positioning mechanism through a sliding rod passing through sliding holes provided on the upper shell and the lower shell, and the grinding mechanism can slide up and down along the sliding rod.

[0009] The rotating drum is a hollow cylindrical structure, and both ends of the inner hole are provided with stop platforms that match the fixing seat. The fixing seat is sleeved in the stop platforms and is fastened to the end of the rotating drum by screws.

[0010] The blade is inserted into a notch provided on the fixing seat, the bottom of the blade is pressed against the stop platform at the end of the rotating cylinder, and the head of the blade is exposed outside the fixing seat.

[0011] The center holes of the upper fixing block and the lower fixing block are tapered holes.

[0012] The chuck is a hollow frustum structure, with an inner diameter of a cylindrical through hole matching the axial diameter of the upper electrode arm and the lower electrode arm, and an outer diameter of a frustum designed to match the central conical holes of the upper and lower fixed blocks, and a plurality of notches are evenly distributed along the length direction of the chuck.

[0013] The upper fixing block and the lower fixing block are both integrally formed with blind holes on their surfaces away from the connecting neck, and the sliding rods are inserted into the blind holes.

[0014] The center line of the bearing of the grinding mechanism, that is, the rotation center of the blade, coincides with the center lines of the upper electrode head and the lower electrode head of the spot welding machine.

[0015] The blade and the fixing seat are interchangeable and can be selected and replaced according to the shape of the electrode head.

[0016] A method for grinding a spot welding machine electrode tip, using the above-mentioned electrode tip grinding device to grind the electrode tip, comprises the following steps:

[0017] S1. Select the blade and fixing seat that match the size and shape of the electrode tip to be ground;

[0018] S2. Separate the upper electrode arm and the lower electrode arm by an appropriate distance to leave appropriate installation space;

[0019] S3. Put the locking nut, the clamping barrel, and the upper fixing block on the upper electrode arm in sequence. Do not tighten the locking nut to complete the pre-fixation of the upper electrode arm and the upper electrode arm.

[0020] S4. Install the locking nut, the clamping barrel, and the lower fixing block onto the lower electrode arm in sequence, and tighten the locking nut to complete the fixation between the lower electrode arm and the lower electrode arm;

[0021] S5. Insert the bottom end of the slide rod into the blind hole of the lower fixed block, then slide the sliding hole of the grinding mechanism onto the slide rod, adjust the position of the upper fixed block so that the top end of the slide rod is inserted into the blind hole on the upper fixed block, and make fine adjustments so that the grinding mechanism can slide smoothly on the slide rod;

[0022] S6. Tighten the locking nut on the upper electrode arm to complete the fixation of the upper fixing block and the upper electrode arm;

[0023] S7. Connect compressed air to the pneumatic motor, press the hand valve to drive the blade to rotate, move the grinding mechanism close to the lower electrode head and apply a certain amount of pressure to scrape off the oxide layer on the surface of the lower electrode head, and continue to cut off a part of the main body material of the electrode head. Then remove the pressure, so that the blade slides quickly on the machined surface after cutting to grind the surface of the electrode head smooth. Similarly, complete the grinding of the upper electrode head.

[0024] S8. After the grinding is completed, the device of the invention can be dismantled in the reverse order of the installation sequence.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) The present invention provides a positioning mechanism so that the movement of the grinding mechanism is limited by the positioning mechanism, so that it can only move along the axis of the electrode head. This ensures that the rotation axis of the blade of the grinding mechanism always coincides with the axis of the electrode head. This ensures that the end faces of the upper and lower electrode heads after grinding meet standard requirements, ultimately achieving higher and more stable welding quality.

[0027] 2) The present invention provides a tapered chuck and a fixing block with a tapered inner hole, which enables uniform force to be applied to the surrounding area when the chuck is locked, thereby ensuring high concentricity between the fixing block and the electrode arm when fixed, thereby ensuring positioning accuracy;

[0028] 3) The blade and the fixing seat of the present invention can be selected and replaced according to the shape of the electrode head to be ground, and thus can be applied to the grinding of a wide variety of electrode heads, having a wide range of uses;

[0029] 4) The device of the present invention has a simple overall structure, is easy to operate, and has a high stability in the positioning and clamping mechanism. Improving the stability during the grinding process is conducive to obtaining a good grinding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the three-dimensional structural principle of the present invention;

[0031] Figure 2 This is a schematic diagram of the three-dimensional structure (explosion) principle of the positioning mechanism of the present invention;

[0032] Figure 3 This is a schematic diagram of the three-dimensional structure (explosion) principle of the grinding mechanism of the present invention;

[0033] Figure 4 yes Figure 3 Schematic diagram of the enlarged structural principle at point A in the middle.

[0034] In the figure: 1 - Upper electrode arm 2 - Locking nut 3 - Upper fixing block 4 - Sliding rod 5 - Upper electrode head 6 - Upper shell 7 - Lower shell 8 - Lower electrode head 9 - Lower fixing block 10 - Lower electrode arm 11 - Clamping tube 12 - Connecting neck 13 - Blind hole 14 - Sliding hole 15 - Fixed seat 16 - Blade 17 - Bearing 18 - Air motor 19 - Hand pressure valve 20 - Rotating cylinder 21 - First gear 22 - Second gear DETAILED DESCRIPTION

[0035] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0036] See Figures 1-4 As shown, the present invention relates to a spot welding machine electrode tip grinding device, including a positioning mechanism and a grinding mechanism, characterized in that the positioning mechanism is composed of a locking nut 2, an upper fixing block 3, a slide rod 4, a lower fixing block 9 and a clamping barrel 11, wherein the locking nut 2, the clamping barrel 11 and the upper fixing block 3 are sequentially sleeved on the upper electrode arm 1, and the locking nut 2 is threadedly connected and fastened with a connecting neck 12 provided on the upper fixing block 3; the locking nut 2, the clamping barrel 11 and the lower fixing block 9 are sequentially sleeved on the lower electrode arm 10, and the locking nut 2 is threadedly connected and fastened with a connecting neck 12 provided on the lower fixing block 9; four slide rods 4 are provided between the upper fixing block 3 and the lower fixing block 9;

[0037] The grinding mechanism comprises an upper shell 6, a lower shell 7, a fixed seat 15, a blade 16, a bearing 17, an air motor 18, a hand pressure valve 19, a rotating drum 20, a first gear 21 and a second gear 22. The two bearings 17 are respectively connected with the outer diameter of the rotating drum 20 by interference fit and are located at both ends of the rotating drum 20. The outer diameter of one bearing 17 is connected with the inner diameter of the upper shell 6 by interference fit, and the outer diameter of the other bearing 17 is connected with the inner diameter of the lower shell 7 by interference fit. The second gear 22 is sleeved on the rotating drum 20 and is located near the lower part of the rotating drum 20. The first gear 21 is provided at the end of the output shaft of the air motor 18 and meshes with the second gear 22. The hand pressure valve 19 is provided on the air inlet end of the air motor 18. The fixed seat 15 and the blade 16 are two sets, which are respectively provided at both ends of the rotating drum 20. The upper shell 6 and the lower shell 7 are sleeved on the air motor 18 to form an integral body, which can be conveniently held.

[0038] The grinding mechanism is connected to the positioning mechanism through the sliding rod 4 via the sliding holes 14 provided on the upper shell 6 and the lower shell 7. The grinding mechanism can slide up and down along the sliding rod 4.

[0039] The rotating drum 20 is a hollow cylindrical structure, and both ends of the inner hole are provided with stop platforms that match the fixing seat 15. The fixing seat 15 is sleeved in the stop platforms and is fastened to the ends of the rotating drum 20 by screws.

[0040] The blade 16 is inserted into the notch provided on the fixing seat 15, and the bottom of the blade 16 is pressed against the stop platform at the end of the rotating drum 20. The head of the blade 16 is exposed outside the fixing seat 15, which is convenient for grinding the electrode head.

[0041] The center holes of the upper fixing block 3 and the lower fixing block 9 are tapered holes.

[0042] The chuck 11 is a hollow frustum-conical structure, with an inner diameter of a cylindrical through hole that matches the axial diameter of the upper electrode arm 1 and the lower electrode arm 10, and an outer diameter of a frustum-conical shape that matches the central conical holes of the upper fixed block 3 and the lower fixed block 9. The chuck 11 is evenly distributed with a number of notches along the length direction, which can ensure that the surrounding force is uniform when the chuck 11 is locked, and thereby ensure that the upper fixed block 3 and the lower fixed block 9 have a high concentricity with the upper electrode arm 1 and the lower electrode arm 10 when they are fixed, thereby ensuring the accuracy of positioning.

[0043] The upper fixing block 3 and the lower fixing block 9 are both integrally formed with a blind hole 13 on their surfaces away from the connection neck 12 , and the sliding rod 4 is inserted into the blind hole 13 .

[0044] The center line of the grinding mechanism bearing 17, that is, the rotation center of the blade 16, coincides with the center lines of the upper electrode head 5 and the lower electrode head 8 of the spot welding machine.

[0045] The blade 16 and the fixing seat 15 are interchangeable, that is, they can be selected and replaced according to the shape of the electrode head.

[0046] A method for grinding a spot welding machine electrode tip, using the above-mentioned electrode tip grinding device to grind the electrode tip, comprises the following steps:

[0047] S1. Select the blade 16 and the fixing seat 15 that match the size and shape of the electrode tip to be ground, and install them at both ends of the drum 20 using the above method;

[0048] S2. Separate the upper electrode arm 1 and the lower electrode arm 10 by an appropriate distance to leave appropriate installation space;

[0049] S3, sequentially fit the locking nut 2, the chuck 11, and the upper fixing block 3 onto the upper electrode arm 1, without tightening the locking nut 2 to complete the pre-fixation of the upper electrode arm 3 and the upper electrode arm 1;

[0050] S4. Sequentially fit the locking nut 2, the clamping barrel 11, and the lower fixing block 9 onto the lower electrode arm 10. Tighten the locking nut 2 to secure the lower fixing block 9 to the lower electrode arm 10.

[0051] S5. Insert the bottom end of the slide rod 4 into the blind hole 13 of the lower fixed block 9, then slide the slide hole 14 of the grinding mechanism onto the slide rod 4. Adjust the position of the upper fixed block 3 so that the top end of the slide rod 4 is inserted into the blind hole 13 on the upper fixed block 3. Fine-tune the grinding mechanism so that it can slide smoothly on the slide rod 4.

[0052] S6. Tighten the locking nut 2 on the upper electrode arm 1 to complete the fixation of the upper fixing block 3 and the upper electrode arm 1;

[0053] S7. Connect compressed air to the pneumatic motor 18, press the hand valve 19 to drive the blade 16 to rotate, move the grinding mechanism close to the lower electrode tip 8 and apply a certain amount of pressure to scrape off the oxide layer on the surface of the lower electrode tip 8, and continue to cut off a part of the main body material of the electrode tip. Then remove the pressure, so that the blade 16 slides quickly on the machined surface after cutting to grind the surface of the electrode tip smooth. Similarly, complete the grinding of the upper electrode tip 5.

[0054] S8. After the grinding is completed, the device of the invention can be dismantled in the reverse order of the installation sequence.

[0055] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A spot welding machine electrode tip grinding device, comprising a positioning mechanism and a grinding mechanism, characterized in that: The positioning mechanism is composed of a locking nut, an upper fixing block, a sliding rod, a lower fixing block and a chuck, wherein the locking nut, chuck and upper fixing block are sequentially mounted on the upper electrode arm, and the locking nut is threadedly connected and fastened to a connecting neck provided on the upper fixing block; the locking nut, chuck and lower fixing block are sequentially mounted on the lower electrode arm, and the locking nut is threadedly connected and fastened to a connecting neck provided on the lower fixing block; four sliding rods are provided between the upper fixing block and the lower fixing block; The grinding mechanism is composed of an upper shell, a lower shell, a fixed seat, a blade, a bearing, an air motor, a hand pressure valve, a rotating drum, a first gear and a second gear, wherein there are two bearings, the inner diameters of the two bearings are respectively connected with the outer diameter of the rotating drum by interference fit and are located at the two ends of the rotating drum, the outer diameter of one bearing is connected with the inner diameter of the upper shell by interference fit, and the outer diameter of the other bearing is connected with the inner diameter of the lower shell by interference fit; the second gear is sleeved on the rotating drum and is arranged near the lower part of the rotating drum, the first gear is arranged at the end of the output shaft of the air motor and meshes with the second gear, and the hand pressure valve is arranged on the air inlet end of the air motor; the fixed seat and the blade are in two sets, respectively arranged at the two ends of the rotating drum; the upper shell and the lower shell are sleeved on the air motor; The grinding mechanism is connected to the positioning mechanism through a sliding rod passing through sliding holes provided on the upper shell and the lower shell, and the grinding mechanism can slide up and down along the sliding rod; The rotating drum is a hollow cylindrical structure, and both ends of the inner hole are provided with stoppers that match the fixing seat. The fixing seat is sleeved in the stoppers and is fastened to the ends of the rotating drum by screws. The blade is inserted into a notch provided on the fixing seat, the bottom of the blade is pressed against the stop platform at the end of the rotating cylinder, and the head of the blade is exposed outside the fixing seat.

2. A spot welding machine electrode tip grinding device according to claim 1, characterized in that: The center holes of the upper fixing block and the lower fixing block are tapered holes.

3. The spot welding machine electrode tip grinding device according to claim 1, characterized in that: The chuck is a hollow frustum structure, with an inner diameter of a cylindrical through hole matching the axial diameter of the upper electrode arm and the lower electrode arm, and an outer diameter of a frustum designed to match the central conical holes of the upper and lower fixed blocks, and a plurality of notches are evenly distributed along the length direction of the chuck.

4. The spot welding machine electrode tip grinding device according to claim 1, characterized in that: The upper fixing block and the lower fixing block are both integrally formed with blind holes on their surfaces away from the connecting neck, and the sliding rods are inserted into the blind holes.

5. The spot welding machine electrode tip grinding device according to claim 1, characterized in that: The center line of the bearing of the grinding mechanism, that is, the rotation center of the blade, coincides with the center lines of the upper electrode head and the lower electrode head of the spot welding machine.

6. The spot welding machine electrode tip grinding device according to claim 1, characterized in that: The blade and the fixing seat are interchangeable and can be selected and replaced according to the shape of the electrode head.

7. A method for implementing the spot welding machine electrode tip grinding device according to claim 1, characterized in that: The following steps are involved: S1. Select the blade and fixing seat that match the size and shape of the electrode tip to be ground; S2. Separate the upper electrode arm and the lower electrode arm to leave space for installation; S3. Put the locking nut, the clamping barrel, and the upper fixing block on the upper electrode arm in sequence. Do not tighten the locking nut to complete the pre-fixation of the upper electrode arm and the upper electrode arm. S4. Install the locking nut, the clamping barrel, and the lower fixing block onto the lower electrode arm in sequence, and tighten the locking nut to complete the fixation between the lower electrode arm and the lower electrode arm; S5. Insert the bottom end of the slide rod into the blind hole of the lower fixed block, then slide the slide hole of the grinding mechanism onto the slide rod, adjust the position of the upper fixed block so that the top end of the slide rod is inserted into the blind hole on the upper fixed block, and make fine adjustments so that the grinding mechanism can slide smoothly on the slide rod; S6. Tighten the locking nut on the upper electrode arm to complete the fixation of the upper fixing block and the upper electrode arm; S7. Connect compressed air to the pneumatic motor, press the hand valve to drive the blade to rotate, move the grinding mechanism close to the lower electrode head and apply a certain amount of pressure to scrape off the oxide layer on the surface of the lower electrode head, and continue to cut off a part of the main body material of the electrode head. Then remove the pressure, so that the blade slides quickly on the machined surface after cutting to grind the surface of the electrode head smooth. Similarly, complete the grinding of the upper electrode head. S8. After the grinding is completed, the spot welding machine electrode tip grinding device can be dismantled in the reverse order of the installation sequence.

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