A precision memory alloy wire welding device

Abstract

The application discloses a precision memory alloy wire welding device and relates to the technical field of laser spot welding.The precision memory alloy wire welding device comprises a laser welding machine, a welding head arranged on one side of the laser welding machine, a welding piece recognition assembly, a preliminary treatment assembly, a gas blowing assembly and a welding head. The welding piece recognition assembly comprises a rotating clamp one arranged on one side of the welding head, wherein the rotating direction of the rotating clamp one is a horizontal rotating direction, and a visual recognition camera is arranged above the rotating clamp one. The preliminary treatment assembly comprises a rotating clamp two arranged on the other side of the welding head, wherein the rotating direction of the rotating clamp two is a vertical rotating direction, clamping plates are fixedly connected to two claw teeth of the rotating clamp two, and a pickling tank is arranged below the rotating clamp two. The precision memory alloy wire welding device utilizes visual recognition, a specific prefabricated template and a three-axis motion platform, achieves the effect of rapid and accurate welding of the alloy wire, improves the welding precision, and simultaneously utilizes the gas blowing assembly to realize the drying of the alloy wire after pickling and to simultaneously inhibit the temperature deformation of the alloy wire.

Description

TECHNICAL FIELD

[0001] A precise memory alloy wire welding device

[0002] The present application relates to the technical field of laser spot welding, in particular to a precise memory alloy wire welding device. BACKGROUND

[0003] Memory alloy is a functional material with unique properties, with shape memory effect and super elasticity two characteristics, memory alloy occurs plastic deformation at a lower temperature, when the temperature rises to a certain value, it will automatically restore to the original shape before deformation. Memory alloy wire due to its super elastic properties, often used in the automobile ECU controller, the car will suffer strong bumps in the running, the use of super elastic memory alloy wire and the pin connection of the controller, and the memory alloy wire and the pin are usually connected by laser welding, the connection between the two can ensure the normal work of the controller while greatly improving the adaptability to the bumpy road, at present, most of the welding processing is in the form of semi-automatic, the welding is controlled by the intelligent welding system, the pins and the memory alloy wire are placed and aligned by artificial, thus there are some problems in the cooperation of artificial and intelligent welding system in welding alloy wire, since the controller is small in size and has many pins, when the alignment and placement of alloy wire are performed by artificial, both the alignment degree of each alloy wire and the correct category of each alloy wire taken should be ensured, under the long-time hard work, the artificial fatigue is more and more serious, finally it is difficult to ensure the precision and quality, and the welding efficiency is low, in the face of huge product demand, how to improve the automation of memory alloy wire welding is a problem to be solved.

[0004] To solve the above problems, a precise memory alloy wire welding device is provided. SUMMARY

[0005] To solve the above technical problems, a precise memory alloy wire welding device is provided, which solves the problems in the background technology. To achieve the above purposes, the following technical solutions can be used in the present application:

[0006] The present application provides a precise memory alloy wire welding device, which comprises a laser welding machine and a welding head arranged on one side of the laser welding machine, and further comprises a welding piece recognition assembly, which comprises a rotating clamp one arranged on one side of the welding head, and a visual recognition camera is arranged above the rotating clamp one.

[0007] The preliminary processing assembly further comprises a base two, which is fixedly installed at the middle part of the side of the laser welding machine away from the base one, and a three-axis motion platform two is fixedly installed at the middle of the top of the base two, and the side surface of the rotary clamp two is fixedly connected with the connecting sliding block of the three-axis motion platform two.

[0008] The preliminary processing assembly further comprises a base two, which is fixedly installed at the middle part of the side of the laser welding machine away from the base one, and a three-axis motion platform two is fixedly installed at the middle of the top of the base two, and the side surface of the rotary clamp two is fixedly connected with the connecting sliding block of the three-axis motion platform two.

[0009] The preliminary processing assembly further comprises a base two, which is fixedly installed at the middle part of the side of the laser welding machine away from the base one, and a three-axis motion platform two is fixedly installed at the middle of the top of the base two, and the side surface of the rotary clamp two is fixedly connected with the connecting sliding block of the three-axis motion platform two.

[0010] The gas blowing assembly further comprises a gas cylinder and a gas pump fixedly installed at the bottom of the base two, the gas outlet of the gas pump is in communication with the gas inlet of the gas cylinder, the gas outlet of the gas cylinder is in communication with the two gas channels through a three-way control valve, and the side of each clamp plate facing the welding head is fixedly connected with a flow deflector.

[0011] The gas blowing assembly further comprises a gas cylinder and a gas pump fixedly installed at the bottom of the base two, the gas outlet of the gas pump is in communication with the gas inlet of the gas cylinder, the gas outlet of the gas cylinder is in communication with the two gas channels through a three-way control valve, and the side of each clamp plate facing the welding head is fixedly connected with a flow deflector.

[0012] Further, the welding piece identification assembly further comprises a base one, which is fixedly installed at the middle part of the side of the laser welding machine, and a three-axis motion platform one is fixedly installed at the middle of the top of the base one, and the side surface of the rotary clamp one is fixedly connected with the connecting sliding block of the three-axis motion platform one.

[0013] Further, the welding piece identification assembly further comprises a base one, which is fixedly installed at the middle part of the side of the laser welding machine, and a three-axis motion platform one is fixedly installed at the middle of the top of the base one, and the side surface of the rotary clamp one is fixedly connected with the connecting sliding block of the three-axis motion platform one.

[0014] From the above, the precise memory alloy wire welding device has the following characteristics and advantages:

[0015] The to-be-welded piece is clamped by the rotating clamping jaw, and then is placed in the scanning area of the visual recognition camera through the driving of the three-axis motion platform I, and then the profile of the to-be-welded piece is scanned and recognized by the visual recognition camera, so that the type identity is confirmed, and according to the recognized type identity, it can be known which specific points need to be spot-welded, and through the accurate driving of the three-axis motion platform I, each point can be accurately aligned with the welding head, avoiding the problem that the device type needs to be recognized manually in the prior art, achieving the effect that the device is quickly and accurately docked with the laser welding head during welding, solving the error problem of finding the welding point of the laser welding head, achieving the purpose of automatic calibration of the welding point of the laser beam, and further improving the problem that the intelligent welding system cannot be effectively and accurately docked during welding. Through the preliminary removal of the oxide film of the alloy wire, the problem of false welding can be avoided, and during welding, since the to-be-welded piece is pre-adapted to the cavity, each alloy wire can correspond to each welding point of the component one by one and be aligned, so that each alloy wire and the corresponding welding point can be sequentially placed at the welding head for automatic welding through the synchronous driving of the two three-axis motion platforms, avoiding the problem that the alloy wire needs to be welded manually in the prior art, achieving the effect that the alloy wire is quickly and accurately docked with the welding head and the component welding point during welding, and improving the welding precision and the precision of the intelligent welding system during welding.

[0016] When the alloy wire is separated from the cleaning pool, the high-pressure inert gas flow is introduced into the air duct, and then the gas flow enters the slot and flows along the surface of the alloy plate, and then the outflowing gas flow flows to the cleaned alloy wire under the action of the deflector plate, realizing the effect of deionized water drying, avoiding affecting the subsequent welding operation, and also inhibiting the re-oxidation of the alloy wire before welding. Further, part of the gas flow flowing into the slot will impact the template after passing through the air hole, and the above-mentioned gas flow impact can effectively inhibit the temperature rise of the alloy wire during welding, avoiding the problem that the alloy wire temperature rises and deforms after a large number of weldings, and achieving the effect of improving the welding quality. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 is a schematic diagram of the overall structure of the present application;

[0018] Fig. 2 is a schematic diagram of the structure of the welding piece recognition assembly of the present application;

[0019] Fig. 3 is another perspective view of the structure of Fig. 2;

[0020] Fig. 4 is a schematic diagram of the structure of the preliminary treatment assembly of the present application;

[0021] Fig. 5 is another perspective view of the structure of Fig. 4;

[0022] Figure 6 is a schematic diagram of the structure of the plate and template shown in the present application;

[0023] Figure 7 is a schematic diagram of another view of the structure in Figure 6;

[0024] Figure 8 is a schematic diagram of the structure of the air blowing assembly shown in the present application.

[0025] In the present application, the reference numerals are as follows:

[0026] 11, laser welding machine; 111, welding head; welding piece identification assembly: 21, rotating jaw one; 22, visual identification camera; 23, base one; 24, three-axis motion platform one; 25, support one;

[0027] preliminary processing assembly: 31, rotating jaw two; 32, clamping plate; 33, pickling tank; 331, cleaning tank; 34, card seat; 35, plate; 351, magnet; 36, template; 361, cavity; 37, base two; 38, three-axis motion platform two; 39, support two;

[0028] air blowing assembly: 41, slot; 42, air duct; 43, deflector; 44, air hole; 45, gas cylinder; 46, air pump. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] Referring to Figures 1-8, the embodiments of the present application provide a precise memory alloy wire welding device, which will be described in detail as follows:

[0031] A precise memory alloy wire welding device, comprising a laser welding machine 11 and a welding head 111 arranged on one side of the laser welding machine 11, referring to Figures 1-3, further comprising a welding piece identification assembly, which comprises a rotating jaw one 21 arranged on one side of the welding head 111, the rotating direction of the rotating jaw one 21 being a horizontal rotating direction, and a visual identification camera 22 arranged above the rotating jaw one 21.

[0032] Further, the welding piece recognition assembly further comprises a base one 23 fixedly installed in the middle of one side of the laser welding machine 11, and a three-axis motion platform one 24 is fixedly installed on the top middle of the base one 23, the side surface of the rotating clamp one 21 is fixedly connected with the abutment sliding block of the three-axis motion platform one 24, and further, the welding piece recognition assembly further comprises a support one 25 fixedly installed on a corner of the top of the base one 23, and the side surface of the visual recognition camera 22 is fixedly connected with the top of the support one 25.

[0033] It should be noted that the laser welding machine 11 involved in the device adopts the prior art, and the laser welding machine 11 is a device that uses a high-energy-density laser beam as a heat source to perform material welding, and its working principle is based on the thermal effect of laser. When the laser beam irradiates the surface of the welding piece, the energy of the laser beam is absorbed by the welding piece and converted into heat energy, which causes the surface of the welding piece to rapidly melt or even vaporize. Due to the high energy density and good directivity of the laser beam, energy can be concentrated in a very small area in a very short time, thereby achieving local heating and welding of materials. Laser spot welding technology is a kind of laser welding technology, which can complete spot welding in a short time and improve production efficiency. For example, in electronic component production, the pin of the component can be quickly connected and spot welded to the circuit board, and multiple spot welds can be completed per second. The visual recognition camera 22 involved in the device adopts the prior art, and the visual recognition camera 22 is a device that combines computer vision technology and camera functions, which can analyze and process the images or videos captured to identify objects, features, patterns, etc. This is the prior art and will not be described in detail.

[0034] The three-axis motion platform one 24 involved in the device adopts the prior art, and the three-axis motion platform is a device that can accurately control the motion in three mutually perpendicular coordinate axes. The working principle of the three-axis motion platform is based on the Cartesian coordinate system, and by controlling the independent motion or cooperative motion of the three axes, the precise positioning and trajectory motion of the load in three-dimensional space are realized. In the device, the three-axis motion platform one 24 is composed of three slide cylinders based on the Cartesian coordinate system, and this is the prior art and will not be described in detail.

[0035] Specific to the embodiment, the above in work, first by rotating the clamping jaw 21 21 clamping, and then through the driving of the three-axis motion platform 24, the welding parts are placed in the scanning area of the visual identification camera 22, and then the profile of the welding parts is scanned and identified by the visual identification camera 22, so as to confirm its model identity, and then the three-axis motion platform 24 is used for transferring, so as to accurately align the welding parts to the welding head 111, and wait for welding. Referring to FIG. 1 and FIG. 4-7, the precise memory alloy wire welding device further comprises a preliminary processing assembly, which comprises a rotating clamp 31 arranged on the other side of the welding head 111, the rotating direction of the rotating clamp 31 is vertical rotating direction, the two jaw teeth of the rotating clamp 31 are fixedly connected with the clamping plate 32, the preliminary processing assembly further comprises an acid pickling tank 33 arranged below the rotating clamp 31, one side of the inside of the acid pickling tank 33 is separated by a cleaning tank 331, the acid pickling tank 33 and the cleaning tank 331 are integrally formed, the acid pickling tank 33 internally contains alloy wire oxide film pickling chemical solution, the cleaning tank 331 internally contains deionized water, and the deionized water has the characteristics of circulating flow. In the embodiment, the circulation of the deionized water is driven by an external water pump. Specifically, the deionized water is pumped out of the cleaning tank 331 by the water pump and flows back into the cleaning tank 331 after being pressurized, and the cleaning of the surface of the welding part by the acid pickling chemical solution is realized by the impact of the water flow. Of course, a deionized water storage tank can also be connected in series in the deionized water circuit, so that the deionized water can be reused, and new deionized water can be used for flushing. The above-mentioned circulation belongs to the most common technical means, which will not be described in detail in the embodiment. The other side of the inside of the acid pickling tank 33 is provided with a plurality of clamping seats 34, each clamping seat 34 is fixedly installed on the inner wall of the two sides of the acid pickling tank 33, the preliminary processing assembly further comprises a plurality of clamping plates 35, each clamping plate 35 is fixedly installed with a magnet 351 at both ends, each pair of clamping plates 35 is attracted by the corresponding magnet 351, each pair of clamping plates 35 is provided with a pair of templates 36, each template 36 is attracted by the corresponding magnet 351 at both ends, and each pair of templates 36 is provided with a plurality of cavities 361 matched with the alloy wire in the inside.The above-mentioned joint plate 35 and the template 36, and the template 36 and the template 36, as shown in FIGS. 6-7, can be precisely positioned and fixed during assembly through the cooperation between the tenon and the mortise, which belongs to the prior art and will not be described here. In use, the thickness, number, and spacing of the alloy wires required for each to-be-welded part are different. Therefore, a pair of corresponding templates 36 is specially made for each to-be-welded part. The internal cavity 361 of the template 36 meets the requirements of the to-be-welded part for the thickness, number, and spacing of the alloy wires. In this way, when welding different to-be-welded parts, only the corresponding template 36 needs to be replaced.

[0036] Further, the preliminary processing assembly further includes a base two 37 fixedly installed at the middle of the side of the laser welding machine 11 away from the base one 23. A three-axis motion platform two 38 is fixedly installed at the top middle of the base two 37. The side surface of the rotary clamp two 31 is fixedly connected with the adapter block of the three-axis motion platform two 38. Further, the preliminary processing assembly further includes a bracket two 39 fixedly installed at the top side of the base two 37. The bottom of the pickling tank 33 is fixedly connected with the top of the bracket two 39.

[0037] In the embodiment, the three-axis motion platform two 38 is consistent with the three-axis motion platform one 24 described above, and will not be described here.

[0038] It should be noted that the surface of the memory alloy wire is exposed to the air, so there is an oxide film covering the surface. If the oxide film is not removed before welding, it will cause problems such as virtual welding at the welding site, resulting in unreliable welding. There are many ways to remove the oxide film of the memory alloy, among which the device uses chemical pickling method to remove the oxide film on the surface of the memory alloy by using a specific acid solution. For example, for nickel-titanium memory alloy, a mixed acid solution of hydrofluoric acid and nitric acid can be used for pickling. Hydrofluoric acid can effectively dissolve the metal oxides in the oxide film, and nitric acid can assist in oxidation and remove impurities. As for the specific pickling process parameters, such as acid concentration, temperature, pickling time, etc., they need to be optimized and adjusted according to the specific composition of the memory alloy and the thickness of the oxide film. Here, it will not be described here. In addition, after pickling, the surface of the memory alloy needs to be thoroughly cleaned with deionized water to remove residual acid and impurities, prevent corrosion of the alloy, and affect the welding, resulting in unstable welding quality.

[0039] In operation, the number of alloy wires needed for welding is determined according to the type of the workpiece to be welded, and the category of the alloy wire is determined. Then, the corresponding template 36 is selected, and the template 36 is assembled with the plate 35. Then, each alloy wire is placed in the corresponding cavity 361 in sequence. The plate 35 is closed to drive the template 36 to close, and the magnet 351 is used to attract and fix the closed plate 35. At this time, the alloy wire is stably placed in the cavity 361. Then, the closed plate 35 assembly is clamped in the clamping seat 34. At this time, the part of the alloy wire exposed outside the cavity 361 is immersed in the chemical solution in the pickling tank 33 to remove the oxide film. After complete removal, the three-axis motion platform two 38 moves the rotating clamp two 31 to approach the alloy wire. Then, the clamping plate 32 clamps the entire plate 35 assembly. The three-axis motion platform two 38 moves the rotating clamp two 31 upward, so that the entire plate 35 assembly is pulled out of the pickling tank 33 and transferred to the cleaning tank 331. Then, the part of the alloy wire just removed from the oxide film is thoroughly washed. After washing, the three-axis motion platform two 38 drives the rotating clamp two 31 to move again, so that the entire plate 35 assembly is pulled out of the cleaning tank 331. Finally, the rotating clamp two 31 drives the entire plate 35 assembly to flip from a vertical state to a horizontal state. When the three-axis motion platform two 38 drives the entire plate 35 assembly to transfer again, the alloy wire can be precisely aligned to the welding head 111. The alloy wire is selected according to the workpiece to be welded, so that each alloy wire can be quickly and one-to-one corresponding to each welding point of the workpiece. Thus, by synchronously driving the three-axis motion platform one 24 and the three-axis motion platform two 38, each alloy wire can be automatically placed in the welding head 111 in sequence, thereby realizing connection.

[0040] Referring to FIG. 1 and FIG. 8, the precision memory alloy wire welding device further comprises a gas blowing assembly, which comprises a slot 41 opened in the middle of the opposite sides of the two clamping plates 32, and a gas channel 42 in the center of each clamping plate 32. Each gas channel 42 is in communication with the corresponding slot 41. Further, the gas blowing assembly further comprises a gas cylinder 45 and a gas pump 46 fixedly installed at the bottom of the base two 37. The gas outlet of the gas pump 46 is in communication with the gas inlet of the gas cylinder 45. The gas outlet of the gas cylinder 45 is in communication with the two gas channels 42 through a three-way control valve. Further, one side of each clamping plate 32 facing the welding head 111 is fixedly connected with a flow deflector 43. Further, a plurality of gas holes 44 are opened in the middle of each plate 35.

[0041] It should be noted that the gas cylinder 45 has an internal pressure monitoring function, when the internal pressure becomes smaller to a certain threshold, the air pump 46 will automatically increase the gas pressure in the gas cylinder 45, the gas outlet of the gas cylinder 45 has a three-way control valve, which can be controlled to release the gas inside, in order to avoid the alloy wire being oxidized again during the drying process, the air pump 46 should suck in inert gas.

[0042] The above, when working, when the clamping plate 32 clamps the whole combination of the plate 35 away from the cleaning pool 331, the three-way control valve is controlled to release the high-pressure gas in the gas cylinder 45, and then the gas flow will enter the air duct 42, and then enter the slot 41, the gas flow flowing into the slot 41 is guided to flow along the surface of the plate 35 after contacting the plate 35, and then the outflowing gas flow flows to the just cleaned alloy wire under the action of the deflector plate 43, and finally realizes the effect of blowing dry the residual deionized water, avoids affecting the subsequent welding operation, further, during spot welding, due to the heat transfer in the alloy wire, after a large number of welding, the alloy wire temperature is easy to rise, and once the temperature reaches the phase transition temperature of the memory material of the alloy wire, the alloy wire will deform, resulting in unstable welding quality, in the device, the gas flow flowing into the slot 41 will impact the template 36 after passing through the air hole 44, the above gas flow impact can effectively inhibit the temperature rise of the alloy wire during welding, and ensure the precise welding.

[0043] It should be noted that in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, combinations, and alterations can be made to the embodiments without departing from the spirit and scope of the present application, which is defined by the appended claims and their equivalents.

Claims

1. A precision shape memory alloy wire welding device, comprising a laser welding machine (11) and a welding head (111) disposed on one side of the laser welding machine (11), characterized in that: It also includes a weldment identification component, which includes a rotating gripper (21) located on one side of the welding head (111), and a visual recognition camera (22) located above the rotating gripper (21). It also includes a preliminary treatment component, which includes a rotating jaw two (31) located on the other side of the welding head (111). Each of the two jaw teeth of the rotating jaw two (31) is fixedly connected with a clamping plate (32). The preliminary treatment component also includes an acid pickling tank (33) located below the rotating jaw two (31). The interior of the acid pickling tank (33) is divided into a cleaning tank (331). The pickling tank (33) has multiple pairs of card holders (34) on the other side of its interior. Each pair of card holders (34) is fixedly installed on the inner walls of both sides of the pickling tank (33). The preliminary treatment assembly also includes multiple pairs of plates (35). Each plate (35) has a magnet (351) fixedly installed at both ends. Each pair of plates (35) is attracted to each other by the corresponding magnet (351). Each pair of plates (35) is provided with a pair of templates (36). Each template (36) is attracted to each other by the corresponding magnet (351) at both ends. Each pair of templates (36) assembly has multiple cavities (361) adapted to the alloy wire inside. The preliminary processing assembly also includes a base two (37), which is fixedly installed on the middle of the side of the laser welding machine (11) away from the base one (23). A three-axis motion platform two (38) is fixedly installed on the top middle of the base two (37), and the side of the rotating gripper two (31) is fixedly connected to the connecting slider of the three-axis motion platform two (38). The preliminary treatment assembly also includes a second bracket (39), which is fixedly installed on the top side of the base (37), and the bottom of the pickling tank (33) is fixedly connected to the top of the second bracket (39); It also includes an air blowing assembly, which includes a slot (41) opened in the middle of the opposite sides of the two clamps (32) and an air passage (42) in the center of each clamp (32), each air passage (42) being connected to the corresponding slot (41); The air blowing assembly also includes a gas cylinder (45) and an air pump (46) fixedly installed at the bottom of the base (37). The outlet of the air pump (46) is connected to the inlet of the gas cylinder (45), and the outlet of the gas cylinder (45) is connected to two air passages (42) respectively through a three-way control valve. Each clamp (32) has a deflector plate (43) fixedly connected to the side facing the welding head (111), and each clamp (35) has multiple air holes (44) in the middle.

2. The precision shape memory alloy wire welding device according to claim 1, characterized in that: The weld identification component also includes a base (23), which is fixedly installed on the middle of one side of the laser welding machine (11). A three-axis motion platform (24) is fixedly installed on the top middle of the base (23), and the side of the rotating gripper (21) is fixedly connected to the connecting slider of the three-axis motion platform (24).

3. The precision shape memory alloy wire welding device according to claim 2, characterized in that: The weldment recognition component also includes a bracket (25), which is fixedly installed on the top corner of the base (23), and the side of the visual recognition camera (22) is fixedly connected to the top of the bracket (25).

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