Welding positioning and sealing optimization method for welding sealing nut

Abstract

The invention discloses a welding positioning and sealing optimization method for a welding sealing nut in the technical field of nut welding, which comprises a base and a vertical rod in threaded connection with the middle axis of the upper part of the base, and further comprises three groups of T-shaped chutes annularly formed in the upper part of the base at equal intervals, and positioning pins for clamping sheet metal parts are slidably connected in the three groups of T-shaped chutes; and a guide area for guiding the sealing nut is arranged at the end part of the positioning pin. Through the collaborative design of the arc-shaped guiding area at the end of the positioning pin and the elastic abutting mechanism of the spring, the problem that an existing fixing shaft pin cannot compensate for the coaxiality deviation of a metal plate hole and a sealing nut is solved, the radius of the inclined face of the guiding area is precisely matched with the inner diameter of the sealing nut, tiny coaxiality deviation can be forcibly corrected, and the machining precision is improved. And in cooperation with the continuous elastic clamping force of the spring, it is ensured that the sealing nut and the metal plate hole are coaxially aligned, dislocation of the sealing ring is avoided, completeness of the sealing contact face is guaranteed, formation of a leakage channel is avoided, and the sealing reliability is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to nut welding technical field, especially relates to a kind of welding sealing nut welding positioning and sealing optimization method. BACKGROUND

[0002] Sealing nut welding positioning is the key process link for realizing the accurate welding of sealing nut and sheet metal part in the field of mechanical manufacturing, automobile production and the like, and is widely applied to assembly scene with higher requirements for connection sealing, structural strength, such as automobile chassis components, industrial equipment housings and the like.The core role of the process is to ensure that the sealing nut and the shaft hole of the sheet metal part are coaxial during welding, to avoid subsequent assembly difficulties, sealing failure or structural load capacity decline caused by positioning deviation, which is directly related to the use performance and reliability of the final product.

[0003] In the existing sealing nut welding positioning technology, there are certain problems, on the one hand, the existing positioning device generally adopts fixed shaft pin structure, and the sheet metal hole is usually slightly larger than the inner diameter of the nut and sealing ring in actual production, the fixed shaft pin cannot self-adaptively compensate the coaxiality deviation of the sheet metal hole and the nut / sealing ring, and slight assembly deviation will cause the sealing ring and the sheet metal hole to be misaligned, damaging the integrity of the sealing contact surface;On the other hand, the existing positioning device lacks stable sheet metal support adjustment mechanism, and the welding point of the convex welding nut cannot be completely melted due to unstable positioning of the sheet metal during welding, so that a small gap is formed between the nut support surface and the sheet metal part, and the gap and the misalignment of the sealing ring form a complete leakage channel, which may cause sealing failure, thereby affecting the use performance and safety of the product, so we urgently need a welding sealing nut welding positioning and sealing optimization method to solve the above problems. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application provides a welding sealing nut welding positioning and sealing optimization method, which compensates for the coaxiality deviation, stably supports the sheet metal by means of positioning pin arc-shaped guide area and elastic abutting mechanism, gear ring-gear synchronous lifting platform and electromagnetic-hydraulic cooperative driving, avoids the misalignment of the sealing ring and the welding gap, and improves the sealing reliability, multi-specification adaptability and production efficiency.

[0005] The purpose of the present application is achieved as follows: a base and a vertical rod threadedly connected to the central axis of the upper part of the base are further provided with three groups of T-shaped sliding grooves equidistantly arranged in the upper part of the base, three groups of T-shaped sliding grooves are slidably connected with positioning pins for clamping sheet metal, and the end of the positioning pin is provided with a guide area for guiding the sealing nut; a guide piece is detachably installed on the inner wall of the T-shaped sliding groove close to the vertical rod, and when the guide piece works, the positioning pin moves along the T-shaped sliding groove path towards the vertical rod direction; a placing platform is arranged on the base for placing the sheet metal.

[0006] Optionally, a sliding block is slidably connected in the lower end sliding groove in the T-shaped sliding groove, the positioning pin end is inserted into the sliding block to form an installation area, and the guide area has a cross-section in the shape of a right-angled triangle, and the inclined surface has an arc shape.

[0007] Optionally, the guide includes a connecting plate mounted on the base by bolts, the connecting plate is located in the T-shaped sliding groove and abuts against the inner wall of the T-shaped sliding groove, a first electromagnet is fixedly mounted on the connecting plate, an input end of the first electromagnet is electrically connected to an external power supply unit through a connecting wire, and a second electromagnet is fixedly mounted on the positioning pin.

[0008] Optionally, two groups of installation grooves are further arranged on the base and correspond to the positions of the T-shaped sliding grooves, the installation grooves are away from the vertical rod and communicate with the T-shaped sliding grooves, hydraulic rods for buffering are arranged in the installation grooves, output ends of the hydraulic rods are bolted to the surface of the positioning pin, and a cover plate for abutting against the hydraulic rods is bolted to the installation grooves, so that a stable area is formed when the cover plate abuts against the surface of the hydraulic rods.

[0009] Optionally, a telescopic rod is arranged between the positioning pin and the vertical rod, a fixed end of the telescopic rod is fixedly mounted on the corresponding side surface of the positioning pin, and a movable end of the telescopic rod is fixedly mounted on the vertical rod, a spring is arranged on the telescopic rod, and two ends of the spring are respectively abutted against the positioning pin and the vertical rod, so that an elastic abutting area is formed when the positioning pin abuts against the inner wall of the shaft hole of the sheet metal part.

[0010] Optionally, a lifting hole for inserting the placement table is arranged on the base, a screw rod for driving the placement table to move is rotatably connected in the lifting hole, the screw rod is threadedly connected with a connecting rod of the placement table, an annular gap is arranged in the middle of the base, a gear is rotatably connected in the annular gap and corresponds to the position of the screw rod, and an end portion of the screw rod extends downward and is fixedly mounted with the corresponding gear.

[0011] Optionally, a gear ring for driving the gear to rotate is slidably connected with the annular gap through a sliding groove, and the gear ring is engaged with the gear, so that when the gear ring rotates, the gear rotates and drives the screw rod and the placement table on the screw rod to rise or fall.

[0012] A welding positioning and sealing optimization method for a welded sealing nut, comprising the following steps: Optionally, S1: checking the initial state of the device, ensuring that the first electromagnet is in an energized state, the positioning pin is retracted to the side close to the vertical rod, the hydraulic rod is in an extended state, the spring is in a compressed state, and the placement table is located at an initial low position.

[0013] Optionally, S2: the sheet metal part to be welded is placed on the placement table, the shaft hole of the sheet metal part is coaxially aligned with the stand, the gear ring is rotated to drive the screw rod to rotate, the placement table is driven to ascend or descend along the lifting hole until the upper part of the sheet metal part is flush with the end of the guide area of the positioning pin.

[0014] Optionally, S3: the power supply of the first electromagnet by the external power supply unit is cut off, after the magnetic field disappears, the positioning pin moves away from the sheet metal part along the T-shaped sliding groove through the sliding block under the elastic restoring force of the spring, the telescopic rod synchronously extends, the hydraulic rod moves and contracts with the positioning pin, and a stable moving damping is provided until the positioning pin and the inner wall of the shaft hole of the sheet metal part form elastic abutment.

[0015] Optionally, S4: the sealing nut is placed at the welding position of the sheet metal part, the circumferential positioning is completed through the arc-shaped slope of the guide area of the positioning pin, the sealing nut is coaxial with the shaft hole of the sheet metal part, and it is confirmed that the sealing nut has no loosening displacement.

[0016] Optionally, S5: the welding device is started to perform the welding operation of the sealing nut and the sheet metal part.

[0017] Optionally, S6: after the welding is completed, the power supply of the first electromagnet is restored, the positioning pin overcomes the spring force under the electromagnetic adsorption force, retreats to the side close to the stand along the T-shaped sliding groove through the sliding block, the telescopic rod synchronously contracts, the hydraulic rod restores the extended state, the placement table is lowered by reversely rotating the gear ring, and the welded product is taken out.

[0018] Optionally, in step S2, when the gear ring rotates, all the gears in the annular notch are synchronously meshed, the same speed rotation of each group of screw rods is realized, and it is ensured that the placement table remains horizontal during the lifting process.

[0019] Optionally, in step S2, after the placement table is lifted into position, the gear ring and the base are locked and fixed through the external buckle; the base is marked with a height scale, and the lifting stroke of the placement table is controlled by the number of gear ring rotation.

[0020] Compared with the prior art, the beneficial effects of the present application are as follows: 1. The present application solves the problem that the existing fixed shaft pin cannot compensate the coaxiality deviation of the sheet metal hole and the sealing nut through the cooperative design of the arc-shaped guide area at the end of the positioning pin and the spring elastic abutment mechanism, the radius of the slope of the guide area is accurately matched with the inner diameter of the sealing nut, the small coaxiality deviation can be forcibly corrected, the continuous elastic clamping force of the spring is matched, the coaxiality of the sealing nut and the sheet metal hole is ensured, the misplacement of the sealing ring is avoided, the integrity of the sealing contact surface is ensured, the formation of the leakage channel is avoided, and the sealing reliability is significantly improved.

[0021] 2. The present application solves the problems of unstable support and low operation efficiency of the existing positioning device by using the lifting placement table with ring gear synchronous transmission and the electromagnetic-hydraulic cooperative driving mechanism. The ring gear drives multiple groups of screw rods to rotate at the same speed, so that the placement table keeps horizontal during lifting, avoiding the welding seam gap caused by the inclination of the sheet metal part; the electromagnetic adsorption realizes the quick reset of the positioning pin, and the hydraulic rod provides smooth damping, preventing rigid impact and improving the operation rhythm, and it is suitable for sheet metal parts of different thicknesses, with better universality and production efficiency than the existing single-specification positioning device. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor based on the provided drawings.

[0023] Figure 1 is the overall structure schematic diagram provided by the present application.

[0024] Figure 2 is the front view structure schematic diagram provided by the present application.

[0025] Figure 3 is the half-section structure schematic diagram provided by the present application.

[0026] Figure 4 is the Figure 3 enlarged structure schematic diagram at A in the above.

[0027] Figure 5 is the partial section structure schematic diagram provided by the present application.

[0028] Figure 6 is the screw rod structure schematic diagram provided by the present application.

[0029] Figure 7 is the local structure schematic diagram provided by the present application.

[0030] In the figure: 1, base; 2, vertical rod; 3, T-shaped sliding groove; 4, positioning pin; 5, guide area; 6, placement table; 7, sliding block; 8, connecting plate; 9, first electromagnet; 10, second electromagnet; 11, mounting groove; 12, hydraulic rod; 13, cover plate; 14, telescopic rod; 15, spring; 16, lifting hole; 17, screw rod; 18, annular notch; 19, gear; 20, gear ring. DETAILED DESCRIPTION

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figures 1-7 As shown, an embodiment of the present invention provides a welding positioning and sealing optimization method for a welding sealing nut, including a base 1 and a vertical rod 2 threadedly connected to the upper central axis of the base 1.

[0033] Here, the base 1 is made of cast iron in one piece to ensure structural rigidity and stability; the upright 2 is connected to the base 1 by M8-M12 threads. The threads have good self-locking properties to avoid loosening due to welding vibration. The upright 2 can be replaced with different diameters according to the specifications of the sealing nut, such as M6 corresponding to a diameter of 5mm for the upright 2 and M12 corresponding to a diameter of 10mm for the upright 2. It has strong adaptability and solves the problem of the single compatibility of the fixed diameter upright 2 in the existing device.

[0034] It also includes: three sets of T-shaped slide grooves 3 equidistantly arranged in a ring on the upper part of the base 1, each set of T-shaped slide grooves 3 having a locating pin 4 for clamping sheet metal parts slidably connected in each of the three sets of T-shaped slide grooves 3, and a slider 7 slidably connected in the lower slide groove of the T-shaped slide groove 3, with the end of the locating pin 4 inserted into the slider 7 to form an installation area.

[0035] Here, the contact surface between the slider 7 and the lower end of the T-shaped groove 3 is provided with a wear-resistant material layer with a thickness of 1mm, which can reduce the sliding friction coefficient, reduce wear and improve smoothness; the end of the positioning pin 4 is provided with a plug-in part with a step height of 2-3mm, and the corresponding position of the slider 7 is provided with a matching plug-in groove. The plug-in part and the plug-in groove are interference fit to avoid loosening, and are locked by M4-M6 transverse set screws to ensure a stable connection.

[0036] Furthermore, the three sets of T-shaped grooves 3 are distributed equidistantly at 120° intervals in a ring, which can form a three-point uniform clamping structure, establish a stable positioning benchmark, and avoid the problem of sheet metal shaking that is prone to occur when clamping at two points; the positioning pin 4 is made of alloy steel with a hardness of HRC40-45; the arc-shaped inclined surface design of the guide area 5 provides circumferential guidance for the sealing nut, solving the problem that traditional fixed shaft pins cannot compensate for coaxiality deviation.

[0037] Furthermore, the end of the locating pin 4 is provided with a guide area 5 for guiding the sealing nut. The cross-section of the guide area 5 is a right triangle, and its inclined surface is set with an arc.

[0038] Here, the arc-shaped inclined surface radius of the guide area 5 is adapted to the inner diameter of the sealing nut, the fitting tolerance, the inclined angle of the inclined surface is 15°-30°, the angle is selected according to the following: less than 15°, the guiding force is insufficient, and the sealing nut is easy to jam; greater than 30°, the guiding stroke is too short, and the coaxiality deviation cannot be compensated, thereby ensuring the guiding accuracy when the sealing nut is positioned circumferentially, and the coaxiality error is small.

[0039] The guide is detachably mounted on the inner wall of the T-shaped sliding groove 3 near the vertical rod 2, when the guide works, the positioning pin 4 moves along the path of the T-shaped sliding groove 3 towards the vertical rod 2, the guide includes a connecting plate 8 mounted on the base 1 by bolts, the connecting plate 8 is located in the T-shaped sliding groove 3 and is attached to the inner wall thereof, a first electromagnet 9 is fixedly mounted on the connecting plate 8, the model can be selected as MFZ1-5.5, the rated suction force is 50N, and the input end cross-sectional area of the first electromagnet 9 is 0.5-1mm² copper core connection line is electrically connected with the external power supply unit, a second electromagnet 10 is fixedly mounted on the positioning pin 4, when the first electromagnet 9 is energized and generates a magnetic field, the second electromagnet 10 drives the positioning pin 4 to move along the path of the T-shaped sliding groove 3 towards the vertical rod 2.

[0040] Here, the opposite end faces of the first electromagnet 9 and the second electromagnet 10 are opposite in polarity, for example, the end face of the first electromagnet 9 is N-pole, and the corresponding end face of the second electromagnet 10 is S-pole, when energized, an adsorption force of 50-100N is generated, the adsorption force is according to: less than 50N cannot overcome the spring force of the spring 15, greater than 100N is easy to cause the positioning pin 4 to impact the base 1 and cause damage, thereby ensuring reliable resetting of the positioning pin 4, the connecting plate 8 is provided with a positioning boss with a height of 3-5mm, the inner wall of the T-shaped sliding groove 3 is provided with a positioning groove with a depth consistent with the height of the boss, thereby ensuring coaxiality of the first electromagnet 9 and the second electromagnet 10, the coaxiality error is small, and the positioning pin 4 is prevented from being offset due to uneven stress during adsorption.

[0041] Further, the first electromagnet 9 and the second electromagnet 10 are made of permanent magnetic material, the adsorption force is stable after energization, and the positioning pin 4 is quickly reset; the positioning boss of the connecting plate 8 cooperates with the positioning groove of the T-shaped sliding groove 3 to ensure the installation accuracy of the electromagnet and avoid adsorption force deviation caused by existing electromagnet installation offset.

[0042] Further, the first electromagnet 9 and the second electromagnet 10 are made of permanent magnetic material, the adsorption force is stable after energization, and the positioning pin 4 is quickly reset; the positioning boss of the connecting plate 8 cooperates with the positioning groove of the T-shaped sliding groove 3 to ensure the installation accuracy of the electromagnet and avoid adsorption force deviation caused by existing electromagnet installation offset.

[0043] Here, the damping coefficient of the hydraulic rod 12 is a suitable damping coefficient, which is based on: insufficient buffering or moving too slowly, affecting the production rhythm, a 2-3mm thick buffer rubber sleeve is provided between the cylinder and the inner wall of the mounting groove 11, which is made of butyronitrile rubber, has excellent oil resistance, and is suitable for the oil pollution in the welding environment; the cover plate 13 is provided with an elastic pressing block made of silicone rubber, which realizes flexible fixing of the hydraulic rod 12, and the radial runout of the hydraulic rod 12 after fixing is small.

[0044] Further, the hydraulic rod 12 provides smooth damping to avoid rigid impact when the positioning pin 4 moves, and protects the surface of the sheet metal part and the guide area 5 of the positioning pin 4; the buffer rubber sleeve and the elastic pressing block realize flexible fixing of the hydraulic rod 12, solving the problem of easy loosening of the existing rigidly fixed hydraulic rod 12.

[0045] A telescopic rod 14 is provided between the positioning pin 4 and the vertical rod 2, the outer diameter of the telescopic rod 14 is 8-12mm, the inner diameter is 6-10mm, the fixed end of the telescopic rod 14 is fixedly installed on the corresponding side surface of the positioning pin 4, and the movable end is fixedly installed on the vertical rod 2, a spring 15 is provided outside the telescopic rod 14, the outer diameter of the spring 15 is 10-15mm, the free length is 20-30mm, the material is piano wire, the tensile strength is ≥1800MPa, and the two ends of the spring 15 are respectively abutted against the positioning pin 4 and the vertical rod 2, the initial abutting force is 10-15N, and when the positioning pin 4 abuts against the inner wall of the shaft hole of the sheet metal part, an elastic abutting area is formed.

[0046] A placing table 6 for placing the sheet metal part is arranged on the base 1, and an antiskid rubber pad is arranged on the upper surface of the placing table 6, the rubber hardness is Shore 70-80A, and the hardness is based on: below 70A, easy to deform, and above 80A, unable to fit the small protrusions on the surface of the sheet metal part, an annular antiskid pattern is formed on the surface of the antiskid rubber pad, the depth of the antiskid pattern is 0.5-1mm, and the pitch is 2-3mm, which is used to increase the friction between the sheet metal part and the placing table 6, and avoid sliding of the sheet metal part during welding.

[0047] Further, the telescopic rod 14 includes an outer tube and an inner rod, the inner rod is slidably connected with the guide groove of the outer tube through a guide protrusion, to prevent circumferential rotation; the spring 15 ensures that the elastic force reaches 30-50N when compressed, to meet the clamping requirement and avoid deformation of the sheet metal part.

[0048] Further, the telescopic rod 14 prevents circumferential rotation of the positioning pin 4, and the spring 15 provides continuous elastic clamping force, to ensure that the positioning pin 4 is closely fitted with the inner wall of the shaft hole of the sheet metal part, and to compensate for the size fluctuation of ±0.1mm of the sheet metal hole, which cannot be compensated by the existing fixed shaft pin, and is easy to cause loosening of clamping or deformation of the sheet metal.

[0049] The base 1 is provided with a lifting hole 16 for inserting the placing table 6, the hole diameter is 0.1-0.2mm larger than the connecting rod of the placing table 6, which ensures smooth lifting without jamming, a screw rod 17 for driving the placing table 6 to move is rotatably connected in the lifting hole 16, the screw rod 17 has a diameter of 10-16mm and adopts trapezoidal thread, the screw rod 17 is threadedly connected with the connecting rod of the placing table 6, a ring-shaped notch 18 with a width of 15-20mm and a depth of 10-15mm is formed in the middle of the base 1, a gear 19 is rotatably connected in the ring-shaped notch 18 and corresponds to the position of the screw rod 17, the gear 19 is made of 45# steel and is quenched and tempered, the end of the screw rod 17 extends downward and is fixedly installed with the corresponding gear 19, the ring-shaped notch 18 is slidably connected with a gear ring 20 for driving the gear 19 to rotate through a sliding groove, and the gear ring 20 is engaged with the gear 19, when the gear ring 20 rotates, the gear 19 rotates and drives the screw rod 17 to lift or lower the placing table 6, the lifting speed is 5-10mm / s, which matches the moving speed of the positioning pin 4 and ensures the positioning synchronization.

[0050] Here, the screw rod 17 adopts trapezoidal thread with a pitch of 4-6mm, the pitch is determined according to that if it is less than 4mm, the lifting speed is too slow, and if it is greater than 6mm, the lifting precision is insufficient; a guide key is arranged on the inner wall of the lifting hole 16, the guide key has a width of 2-3mm, and a guide key groove corresponding to the guide key is formed in the connecting rod of the placing table 6 to limit the circumferential rotation; the gear 19 is made of 45# steel and is quenched and tempered.

[0051] Further, the outer circumferential surface of the gear ring 20 is provided with straight anti-skid knurls to increase the friction force of the hand, which is convenient for manual rotation, a plurality of ball bearings are arranged between the ring-shaped notch 18 and the gear ring 20, which has a significant labor-saving effect; the gear ring 20-gear 19 transmission realizes the synchronous rotation of the three screw rods 17, which ensures the horizontal lifting of the placing table 6; the trapezoidal thread screw rod 17 cooperates with the guide key to improve the lifting precision and stability, and solves the problem of welding offset of the sealing nut caused by the inclination of the existing placing table 6 during lifting.

[0052] A welding sealing nut welding positioning sealing optimization method, comprising the following steps: S1: check the initial state of the device, ensure that the first electromagnet 9 is in the energized state (confirm the normal power supply through the indicator light to avoid the positioning pin 4 not to reset due to power failure), the positioning pin 4 is withdrawn along the T-shaped sliding groove 3 to the side close to the vertical rod 2 (the withdrawal distance is 5-10mm, and the space for placing the sheet metal part is reserved), the hydraulic rod 12 is in the extended state (the extension length is 15mm, and the maximum stroke is 15mm), the spring 15 is in the compressed state (the compression amount is 5mm, and the initial elastic force is 15N), the placing table 6 is located at the initial low position (10-15mm away from the upper surface of the base 1, which is convenient for manual or mechanical hand to take and place the sheet metal part), and the oil pressure of the hydraulic rod 12 is 0.3-0.5MPa, which is determined according to that the insufficient buffer or excessive damping affects the moving speed of the positioning pin 4, the spring 15 is not deformed, and the guiding area 5 of the positioning pin 4 is not worn, which ensures that each component is in normal working condition.

[0053] S2: Place the sheet metal part to be welded (thickness 2-10 mm, material usually Q235 or SPCC) on the placement table 6, so that the shaft hole of the sheet metal part (the hole diameter is larger than the diameter of the stand 2 by 0.1-0.2 mm, leaving an assembly gap) is coaxially aligned with the stand 2 (preliminary alignment by the naked eye, subsequent automatic calibration by the positioning pin 4), rotate the gear ring 20 (manual rotation, rotation speed 10-20 r / min, to avoid excessive rotation speed of the placement table 6 leading to overtravel of the lifting hole 16), drive the screw 17 to rotate through the gear 19, drive the placement table 6 to rise and fall along the lifting hole 16, until the upper part of the sheet metal part is flush with the end of the guide area 5 of the positioning pin 4 (ensure that the guide area 5 effectively contacts the sealing nut).

[0054] In step S2, when the gear ring 20 rotates, it is synchronously engaged with all the gears 19 in the annular notch 18, achieving synchronous rotation of each group of screws 17, ensuring that the placement table 6 remains horizontal during lifting, avoiding positioning deviation caused by tilting of the sheet metal part.

[0055] In step S2, after the placement table 6 is lifted into position, the gear ring 20 is locked and fixed with the base 1 by external buckles, the buckle material is 45 steel, to prevent the gear ring 20 from loosening due to welding vibration; the base 1 is marked with a height scale, the lifting stroke is controlled by the number of rotations of the gear ring 20, each rotation corresponds to a lifting of 4-6 mm, suitable for sheet metal parts of different thicknesses (2-10 mm).

[0056] Here, after the placement table 6 is lifted into position, the gear ring 20 is locked with the base 1 by external buckles, combined with the height scale of the base 1, the lifting stroke is controlled by the number of rotations of the gear ring 20, ensuring that the sheet metal part is accurately aligned with the guide area 5 of the positioning pin 4.

[0057] S3: Cut off the power supply to the first electromagnet 9 by the external power supply unit (cut off by a relay, achieve rapid power-off), after the magnetic field disappears, the positioning pin 4 is elastically returned under the action of the spring 15 (the return force gradually increases from 15 N to 30-50 N, to ensure that the clamping force is smoothly increased), the sliding block 7 moves along the T-shaped sliding slot 3 away from the sheet metal part of the stand 2, the extension rod 14 synchronously extends (extension speed 5-10 mm / s, consistent with the moving speed of the positioning pin 4), the hydraulic rod 12 moves with the positioning pin 4 and contracts, providing smooth moving damping, until the positioning pin 4 and the inner wall of the shaft hole of the sheet metal part form elastic resistance, the moving speed of the positioning pin 4 is controlled at 5-10 mm / s to avoid rigid impact, until the positioning pin 4 and the inner wall of the shaft hole of the sheet metal part form elastic resistance (the resistance force is detected by a pressure sensor, 30-50 N, to ensure that the clamping is reliable and does not damage the sheet metal part).

[0058] S4: Place the sealing nut (usually M6-M12, with a sealing ring, the sealing ring material is butyronitrile rubber or fluorine rubber) in the welding position of the sheet metal part, and complete the circumferential positioning by guiding the arc slope of area 5 through positioning pin 4, so that the sealing nut is coaxial with the shaft hole of the sheet metal part, and no displacement of the sealing nut is confirmed.

[0059] S5: Start the welding equipment (usually a projection welding machine) to perform the welding operation of the sealing nut and the sheet metal part, and the welding parameters are set as follows: welding current 8-12 kA, welding time 0.5-1 s, electrode pressure 100-200 N, and the weld penetration is ensured to be 0.5-1 mm to avoid sealing failure caused by incomplete fusion.

[0060] S6: After welding is completed, the weld is cooled to 25℃±5℃ (the temperature is detected by a thermocouple to avoid deformation of the sheet metal part or the sealing nut caused by high-temperature part removal), the power supply of the first electromagnet 9 is restored, the positioning pin 4 overcomes the spring force (30-50 N) of the spring 15 under the action of the electromagnetic attraction force (50-100 N), the sliding block 7 is withdrawn to the side close to the vertical rod 2 through the T-shaped sliding groove 3, the telescopic rod 14 is synchronously retracted, the hydraulic rod 12 restores the extended state, the reverse rotating gear ring 20 makes the placement table 6 descend (the descending speed is 10-15 mm / s, and the part removal efficiency is improved), and the welded product is removed.

[0061] The above examples are only used to help understand the method of the present application and its core idea. It should be noted that for ordinary skilled persons in the art, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A welding positioning method for a welded sealing nut, characterized in that: Including a base (1) and a vertical rod (2) threadedly connected to the upper central axis of the base (1), and also including: Three sets of T-shaped slide grooves (3) are equidistantly arranged on the upper part of the base (1). Each of the three sets of T-shaped slide grooves (3) is slidably connected with a positioning pin (4) for clamping sheet metal parts, and the end of the positioning pin (4) is provided with a guide area (5) for guiding the sealing nut. A guide is detachably installed on the inner wall of the T-shaped slide (3) near the upright (2). When the guide is in operation, the positioning pin (4) moves along the path of the T-shaped slide (3) toward the upright (2). The lifting device is located on the base (1) and is used as a placement platform (6) for placing sheet metal parts.

2. The welding positioning method for a welding sealing nut according to claim 1, characterized in that: The lower end of the T-shaped groove (3) is slidably connected to a slider (7). The end of the positioning pin (4) is inserted into the slider (7) to form an installation area. The cross section of the guide area (5) is a right triangle, and its inclined surface is set in an arc.

3. The welding positioning method for a welding sealing nut according to claim 1, characterized in that: The guide includes a connecting plate (8) that is bolted to the base (1). The connecting plate (8) is located in the T-shaped groove (3) and fits against its inner wall. A first electromagnet (9) is fixedly installed on the connecting plate (8), and the input end of the first electromagnet (9) is electrically connected to an external power supply unit through a connecting line. A second electromagnet (10) is fixedly installed on the positioning pin (4). When the first electromagnet (9) is energized and generates a magnetic field, the second electromagnet (10) drives the positioning pin (4) to move along the path of the T-shaped groove (3) toward the upright (2).

4. The welding positioning method for a welding sealing nut according to claim 3, characterized in that: It also includes two sets of mounting slots (11) opened on the base (1) and corresponding to the T-shaped slide (3). The mounting slots (11) are away from the upright (2) and connected to the T-shaped slide (3). A hydraulic rod (12) for buffering is placed in the mounting slot (11). The output end of the hydraulic rod (12) is bolted to the surface of the positioning pin (4). A cover plate (13) for pressing against the hydraulic rod (12) is bolted on the mounting slot (11). When the cover plate (13) abuts against the surface of the hydraulic rod (12), a stable area is formed.

5. The welding positioning method for a welding sealing nut according to claim 4, characterized in that: A telescopic rod (14) is provided between the positioning pin (4) and the upright (2). The fixed end of the telescopic rod (14) is fixedly installed on the side corresponding to the positioning pin (4), and its movable end is fixedly installed on the upright (2). A spring (15) is provided on the outer sleeve of the telescopic rod (14). The two ends of the spring (15) abut against the positioning pin (4) and the upright (2) respectively. When the positioning pin (4) abuts against the inner wall of the shaft hole of the sheet metal part, an elastic pressing area is formed.

6. The welding positioning method for a welding sealing nut according to claim 1, characterized in that: The base (1) has a lifting hole (16) for inserting the placement platform (6). A screw (17) for driving the placement platform (6) to move is rotatably connected in the lifting hole (16). The screw (17) is threadedly connected to the connecting rod of the placement platform (6). An annular notch (18) is opened in the middle of the base (1). Gears (19) are rotatably connected in the annular notch (18) and at the position corresponding to the screw (17). The end of the screw (17) extends downward and is fixedly installed with the corresponding gear (19).

7. The welding positioning method for a welding sealing nut according to claim 6, characterized in that: The annular notch (18) is slidably connected to a toothed ring (20) for driving the gear (19) to rotate via a sliding groove. The toothed ring (20) meshes with the gear (19). When the toothed ring (20) rotates, the gear (19) rotates accordingly and drives the platform (6) on the screw (17) to rise or fall.

8. A welding positioning and sealing optimization method for a welded sealing nut, used for welding positioning of the welded sealing nut according to any one of claims 1-7, characterized in that, Includes the following steps: S1: Check the initial state of the device, ensure that the first electromagnet (9) is energized, the positioning pin (4) moves along the T-shaped slide (3) to the side close to the upright (2), the hydraulic rod (12) is extended, the spring (15) is compressed, and the placement platform (6) is in the initial low position. S2: Place the sheet metal part to be welded on the placement table (6) so that the shaft hole of the sheet metal part is aligned with the upright (2) on the same axis. Rotate the gear ring (20) to drive the screw (17) to rotate through the gear (19), and drive the placement table (6) to rise and fall along the lifting hole (16) until the upper part of the sheet metal part is flush with the end of the guide area (5) of the positioning pin (4); S3: Cut off the power supply of the external power supply unit to the first electromagnet (9). After the magnetic field disappears, the positioning pin (4) moves along the T-shaped slide groove (3) away from the sheet metal part by the slider (7) under the elastic restoring force of the spring (15). The telescopic rod (14) extends synchronously, and the hydraulic rod (12) moves and retracts with the positioning pin (4) to provide smooth movement damping until the positioning pin (4) forms an elastic abutment with the inner wall of the shaft hole of the sheet metal part. S4: Place the sealing nut at the welding position of the sheet metal part, and complete the circumferential positioning through the arc-shaped inclined surface of the guide area (5) of the positioning pin (4) so ​​that the sealing nut is coaxial with the shaft hole of the sheet metal part and confirm that the sealing nut has no loosening or displacement. S5: Start the welding equipment to perform welding operations on the sealing nut and the sheet metal part; S6: After welding is completed, power supply to the first electromagnet (9) is restored. The positioning pin (4) overcomes the spring force of the spring (15) under the action of electromagnetic adsorption force and moves along the T-shaped slide (3) to the side close to the upright (2) through the slider (7). The telescopic rod (14) retracts synchronously, the hydraulic rod (12) returns to the extended state, and the toothed ring (20) is rotated in the opposite direction to make the placement platform (6) descend and take out the welded product.

9. The welding positioning and sealing optimization method for a welding sealing nut according to claim 8, characterized in that: In step S2, when the gear ring (20) rotates, it meshes synchronously with all the gears (19) in the annular notch (18) to achieve the same speed rotation of each set of screws (17), ensuring that the placement platform (6) remains horizontal during the lifting and lowering process.

10. The welding positioning and sealing optimization method for a welding sealing nut according to claim 8, characterized in that: In step S2, after the placement platform (6) is raised and lowered to the position, the toothed ring (20) is locked and fixed to the base (1) by the external buckle; the base (1) is marked with height scale, and the lifting stroke of the placement platform (6) is controlled by the number of rotations of the toothed ring (20).

Images