WO2015180263A1 - Structure de micro-raccordement à soudage à enveloppement et procédé de micro-raccordement à soudage à enveloppement pour fil amorphe à base de cobalt - Google Patents

Structure de micro-raccordement à soudage à enveloppement et procédé de micro-raccordement à soudage à enveloppement pour fil amorphe à base de cobalt Download PDF

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Publication number
WO2015180263A1
WO2015180263A1 PCT/CN2014/083933 CN2014083933W WO2015180263A1 WO 2015180263 A1 WO2015180263 A1 WO 2015180263A1 CN 2014083933 W CN2014083933 W CN 2014083933W WO 2015180263 A1 WO2015180263 A1 WO 2015180263A1
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WO
WIPO (PCT)
Prior art keywords
welding
micro
weldment
cobalt
based amorphous
Prior art date
Application number
PCT/CN2014/083933
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English (en)
Chinese (zh)
Inventor
杨仕桐
杨诚
Original Assignee
广州微点焊设备有限公司
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Publication of WO2015180263A1 publication Critical patent/WO2015180263A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/10—Spot welding; Stitch welding
    • B23K11/11—Spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
    • B23K2101/42—Printed circuits

Definitions

  • the present invention is in the field of soldering and micro-joining, and more particularly, the present invention relates to a structure of a wrap-welded micro-join and a wrap-weld micro-joining method of a cobalt-based amorphous wire.
  • Micro-joining refers to the small diameter of the wire or the width and thickness of the strip are less than 0.10mm.
  • a connection between metallic materials, and various welding techniques are one of the main means of micro-joining.
  • how to connect various small solderable workpieces such as cobalt wire, platinum wire, manganese wire, and tungsten wire to electronic components is still a technical problem in the field of resistance welding or micro-connection.
  • soldering In the current methods of soldering, ultrasonic welding or laser welding, soldering often fails to meet the requirements of use, while laser welding is difficult to apply in the manufacture of electronic components.
  • cobalt-based amorphous wires have a giant magnetoresistance effect, and they have a giant stress electrical impedance effect when alternating currents, and thus can be used to make various micro force sensors or tactile sensors in aerospace, defense, and The medical field has broad application prospects.
  • the cobalt-based amorphous wire is not only hard and brittle, but also has poor solderability, and its magnetic properties disappear at a high temperature (1150 ° C), high temperature cannot be used for connection, and a cobalt-based amorphous wire is required for the production of the sensor.
  • the oxide film on the surface must be completely removed so that the DC resistance of the contact with the electronic component tends to zero.
  • the object of the present invention is to provide a micro-joint for a small workpiece with poor solderability; the second is to use a cobalt-based amorphous wire with poor solderability as an example, and propose a micro-joining of a cobalt-based amorphous wire sensor circuit. Specific micro-connection method.
  • the package soldering micro-join is a new resistance welding technology for micro-joining of the micro-workpiece and the weldment with poor weldability, and the technology can
  • the micro-workpiece with poor weldability is placed between the two weldments that are overlapped with each other. By welding the spot welds of the two weldments, the two weldments with poor weldability are tightly wrapped by the two weldments that are welded together. connection.
  • the present invention provides a structure of a wrap-welded micro-join, which comprises a micro-workpiece with poor weldability and two weldments which are respectively a base weldment and a wrap weldment, and a small workpiece with poor weldability is located.
  • a wrap-welded micro-join which comprises a micro-workpiece with poor weldability and two weldments which are respectively a base weldment and a wrap weldment, and a small workpiece with poor weldability is located.
  • the base weldment and the wrap weldment are spot-welded by the electric resistance spot welding equipment, and the two weldments of the micro-workpiece with poor weldability are welded together.
  • the package is tightly wrapped to achieve a connection to the base weldment.
  • At least one of the base weldment and the wrap weldment has a tin-plated or tin-plated tin layer on the surface thereof, or the surfaces of the two weldments have Tin layer.
  • the electric resistance spot welding apparatus performs spot welding of two weldments by a parallel electrode welding head.
  • the parallel electrode horn is a parallel electrode horn in contact with the electrode tip, a parallel electrode horn of the electrode tip connected body, and the electrode tip is neither contact nor connected.
  • the welded end face of the parallel electrode horn is a concave arc end face.
  • the minute workpiece having poor solderability is a minute workpiece made of a hard-hard metal and an alloy thereof, and a minute workpiece or surface having an insulating layer on the surface.
  • the minute workpiece made of the hard-hardened metal and its alloy is a minute workpiece made of cobalt and its alloy, a minute workpiece made of platinum and its alloy. Tiny workpieces made of manganese, its alloys, tiny workpieces made of tantalum and its alloys, or tiny workpieces made of tungsten and its alloys.
  • the minute workpiece is a wire having a wire diameter of less than or equal to 00.10 mm, or a tape having a thickness or width of less than or equal to 0.10 mm.
  • the electric resistance spot welding equipment is HPPR micro-welding equipment, and the HPPR micro-welding equipment is integrated with hot-welding (H), parallel gap welding (P), Structural features of spot welder head (P) and resistance welding microweld (R) for precision electrode force pressurization systems.
  • H hot-welding
  • P parallel gap welding
  • P Structural features of spot welder head
  • R resistance welding microweld
  • the structure of the wrapped micro-join of the present invention adds a wrap weldment covering a small workpiece with poor weldability, and spot welds the spot weldment to the base weldment through a resistance welding spot welding device.
  • the reliable connection between the micro workpiece and the base weldment is realized, and the welding problem of the micro workpiece with poor weldability is effectively solved.
  • the present invention also provides a wrap-welded micro-joining method of a cobalt-based amorphous wire, which comprises the following steps:
  • the wrap-welding micro-joining method of the cobalt-based amorphous wire of the present invention after the reliable micro-connection of the cobalt-based amorphous wire and the connection pad in the step 3), the wrap weldment is not connected yet. The excess portion of the pads soldered together is removed.
  • the device is preferably an HPPR microsurgery device.
  • the welded end face of the parallel electrode tip is a concave arc end face.
  • connection pad is a connection pad for tin-plating the base material.
  • the wrap weldment is a tin-plated weldment.
  • the cobalt-based amorphous wire sensor circuit is a printed wiring board circuit.
  • the structure of the package-welded micro-join of the present invention is characterized in that the cobalt-based amorphous wire is hard and brittle, has poor solderability, has an oxide film on the surface, and cannot be used at a high temperature, and is tin-plated by the packaged weldment and the connection pad, and HPPR microscopy is applied.
  • the present invention is a cobalt-based amorphous wire as compared with the prior art.
  • the cobalt-based amorphous wire connection of the sensor circuit provides a viable new connection method.
  • FIG. 1 is a schematic structural view of a package solder micro connection according to the present invention.
  • Fig. 2 is a schematic view showing the structure of a spot welding machine head of a resistance welding spot welding apparatus and a precise electrode force pressing system.
  • FIG. 3 is a schematic view showing the circuit structure of a printed wiring board of a cobalt-based amorphous wire sensor.
  • FIG. 4 is a schematic view showing the structure of a cobalt-based amorphous wire connected to a sensor circuit by a wrap-welding micro-joining method of a cobalt-based amorphous wire of the present invention.
  • the soldered workpiece 224 and the resistance welding spot welding apparatus 100 pass through the output cable 214 and the horn clip 212.
  • the parallel electrode horns 223 are connected; the workpiece 224 to be welded includes two weldments of the base weldment 103 and the wrap weldment 102, and the two weldments 102 and 103 are assembled as lap joints, and the micro-workpiece 101 with poor weldability is placed in the second In the middle of the weldments 102, 103, the electric resistance spot welding apparatus 100 spot welds the two weldments 102 and 103 by the parallel electrode horn 223, so that the two weldments 102 in which the micro-workpieces 101 with poor weldability are welded together are realized. Reliable connection to the tight package of 103.
  • the minute workpiece refers to a wire having a wire diameter of less than or equal to 00.10 mm, or a tape having a thickness or width less than or equal to 0.10 mm, and the minute workpiece 101 is generally a workpiece having poor weldability.
  • the two weldments 102, 103 are provided.
  • the surface of at least one of the weldments needs to have a soft metallic tin layer 104, such as tin or tin plating on the surfaces of the weldments 102, 103; of course, the surfaces of the two weldments 102, 103 may be sprayed or plated. tin.
  • tin is relatively soft, has good wettability, good electrical conductivity, and low melting point, the current of the pressure resistance welding does not need to generate too high resistance heat, and the tin layer 104 can wrap the small workpiece 101 with poor solderability.
  • the two weldments 102, 103 are further subjected to solid phase connection or fusion, thereby achieving reliable connection of the micro workpiece 101 and the weldments 102, 103.
  • the tin layer 104 has a low melting point and is wettable, the tin layer on the surface of the weldments 102, 103 can be an oxide film or an insulating varnish on the surface of the minute workpiece 101 when the electric resistance spot welding apparatus is pressurized for single-sided spot welding.
  • the wrapped micro-joined structure of the present invention can be applied not only to various hard-to-hard metals and their alloys, but also to poorly solderable micro-workpieces, including but not limited to cobalt and Tiny workpieces made of alloys, tiny workpieces made of platinum and its alloys, tiny workpieces made of manganese and its alloys, tiny workpieces made of tantalum and its alloys, tiny workpieces made of tungsten and its alloys, but also It can be applied to various small workpieces with insulating layer or insulating varnish on the surface, such as cobalt-based amorphous wire with oxide film or enameled wire of manganese wire, enameled wire of copper wire, etc.
  • the way of spot welding the two weldments lapped together by electric resistance welding comprising a double-sided spot welding method in which two electrodes are formed as upper and lower electrodes on the upper and lower sides of the two weldments, and a single-sided spot welding method in which two electrodes are formed as parallel electrodes on the same side of the two weldments,
  • the above two spot welding methods can be applied to the package solder micro connection, but in practice, the package solder micro connection often has no working position of the lower electrode, so the package solder micro connection proposed by the present invention is mainly applied in parallel.
  • the single-sided spot welding method of the electrode, and the single-sided spot welding is mainly applied to the various parallel electrode welding heads proposed by the present invention, in addition to the two electrodes to which parallel electrodes can be applied.
  • Parallel electrode horn 223 is the main tool for single-sided spot welding of two weldments of electric resistance welding equipment. It is necessary to further explain it: Parallel electrode horn 223 can be parallel electrode horn or tip contact of electrode tip joint The parallel electrode horn may also be a parallel electrode horn in which the electrode tip is neither connected nor in contact, or may be two electrodes in parallel.
  • the resistance welding spot welding apparatus 100 feeds the parallel electrode 223, the two weldments 102, 103 can generate resistance heat, and the two weldments 102, 103 are welded together and tightly wrapped with a small weldability.
  • the workpiece 101 achieves a reliable connection.
  • the parallel electrode horn shown in Fig. 1 is a parallel electrode horn whose welding end face is a concave arc end face, and its role in the wrap welding micro-join is as follows: When the parallel electrode horn 223 of the concave arc end face is covered, the solderability is poor. When the wrap weldment 102 on the minute workpiece 101 is spot-welded, on the one hand, the two ends of the concave arc outer side can ensure reliable welding of the two weldments 102, 103, and on the other hand, the concave arc end face is the lowest. The minute workpiece 101 with poor solderability of the dots can also ensure that the two soldering members that are welded together are tightly wrapped to achieve a reliable connection.
  • the present invention proposes a HPPR micro-welding device dedicated to the package welding micro-joining, since the HPPR micro-floating device integrates Heat and Pressure Welding (H) and Parallel electrode with single side welding (parallel gap floating P) , the structural features of the Precise Force System in header, the resistance of micro welding, and therefore the advantages of these four structures.
  • the present invention is referred to as an HPPR microsurgery device.
  • HPPR micro-welding equipment including thermo-compression welding (H), parallel gap welding (P), with precise electrode force pressing system Spot welder head (P) and resistance welding micro-welding (R) four parts.
  • HPPR micro-welding equipment can achieve output pulse precision of 0.01V, output pulse width of 0.1ms, welding energy of 0.5 joules, electrode force of 0.5N, it is conceivable that the traditional resistance welding spot welding equipment its output energy accuracy is generally in Shi 10J The precision of the electrode force is generally 10N, so the conventional resistance welding spot welding equipment is often unable to perform the micro-joining of the micro-workpiece with a small weldability of less than 00.10 mm.
  • HPPR micro-welding equipment a welding head clamp is mounted on the spot welding machine head with a precise electrode pressurizing system, and the parallel electrode welding head is mounted on the welding head clamp, and the electric resistance welding micro-welding power supply A welding current is supplied to the parallel electrode horn by connecting the output cable to the horn clip. When the welding current is turned on, the current first passes through the tip of the parallel electrode horn to cause high temperature or electric spark, and the current is then subjected to hot-welding and resistance welding of the weldment through the weldment.
  • the HPPR micro-welding equipment is a resistance welding spot welding equipment with high welding energy regulation precision and welding force control precision. In other words, HPPR micro-welding equipment is also a resistance welding spot welding equipment.
  • the present invention is primarily directed to a spot welder head having a precision electrode force pressurization system.
  • the electrode force pressurization system refers to the relevant structure for providing the electrode force during the welding period, and the precise electrode force pressurization system is provided.
  • the electrode force can meet the relevant structure of resistance welding micro-welding requirements, that is, the precise electrode force pressing system must meet the following three requirements: First, the preset electrode force must be accurate and consistent; Second, the electrode force during the entire welding period Both are maintained and maintained relatively constant within a predetermined range; the third is that the welding force must be cut off to over pressurize the weldment while the welding is completed. Therefore, the precise electrode force pressing system correspondingly needs to cooperate by the three parts of the electrode force presetting device, the welding force transmitting device and the welding breaking device.
  • the spot welder head with the precise electrode force pressurization system of the present invention comprises a head frame, a precise electrode force pressurization system mounted on the head frame, and a precise electrode force pressurization system including a welding force transmission
  • the device, the precise electrode force presetting device and the welding force breaking device the electrode force is maintained and kept relatively constant throughout the welding period by the precise electrode force pressing system; the welding force transmitting device will The welding power is transmitted through its torque, and the welding force is converted into the electrode force to be transmitted to the welding head clamp;
  • the precise electrode force presetting device provides a setting for pre-setting the quantized electrode force, and the electrode force is detected to reach a preset value.
  • the spot welding power source is driven to provide a welding current; the welding force breaking device blocks the torque transmission of the welding force when the electrode force reaches a predetermined amount.
  • the resistance welding spot welding apparatus 100 is connected to the parallel electrode 223 through the output cable 214 and the horn clip 212, and the welded workpiece 224 is placed on the workpiece stage 225.
  • the enlarged view of the A portion is shown in FIG. Specifically, the structure of the welding force transmission device and the precise electrode force presetting device in the precise electrode force pressing system will be described below with reference to FIG.
  • the head frame of the spot welder head has four front and rear façades, and the front façade of the head frame is 201. After the front façade 201 of the frame is clarified, the front 411 of the frame is also defined. The rear facade and the left and right facades.
  • a column 202 is fixed to the façade near the head frame, and the lower portion of the column 202 is fixedly mounted on the table.
  • a small shaft 203, a middle shaft 204, and a slide shaft 205 which are mounted in parallel with the column 202 are provided on the head frame; and a center shaft clamp 206 and a slide shaft clamp 207 which are mounted in a vertical direction with the column 202.
  • One end of the middle axle clamp 206 is fastened to the middle axle 204, and the other end of the middle axle clamp 206 is sleeved on the welding power transmission rod 222 (or cable); the return spring 221 is connected to the middle axle clamp 206, and the other end is connected.
  • One end of the sliding shaft clamp 207 is fastened to the sliding shaft 205, and the upper and lower sections of the central shaft 204 are divided into two sections.
  • the compression springs 208, 209 are described.
  • the small shaft 203 penetrates the middle shaft clamp 206 and the slide shaft clamp 207 in a slidable manner; in addition, the small shaft 203 is also divided into upper and lower sections provided with compression springs 210, 211, and the slide shaft clamp 207 is divided by the small shaft 203.
  • the upper and lower end faces respectively contact or connect the compression springs 210, 211.
  • the lower end of the slide shaft 205 is fixedly coupled to the horn clip 212, and the parallel electrode horn 223 is mounted on the horn clip 212.
  • the small shaft 203, the middle shaft 204, the middle shaft clamp 206, and the sliding shaft clamp 207 which realize the predetermined installation structure constitute a welding force transmission structure; the sliding shaft 205 and the welding head which realize the predetermined installation structure are realized.
  • the clip 212 constitutes an electrode force transmitting structure; the first set of compression springs 208, 209 and the second set of compression springs 210, 211 mounted on the center shaft 204 and the small shaft 203 constitute a welding force buffering structure.
  • the small shaft 203 and the middle shaft 204 are the guiding shafts for the welding force
  • the middle shaft clamp 206 and the sliding shaft clamp 207 are the conductors of the welding force
  • the small shaft 203 and the sliding shaft 205 It is the guide shaft of the electrode force
  • the horn clip 212 is a conductor of the electrode force.
  • the welding force buffering structure substantially refers to a compression spring installed between the welding force conducting structure and the electrode force conducting structure, and the function thereof includes gently transmitting the welding force to the electrode force conducting structure and when When the welding force is broken, the welding force can still be maintained by the action of the compression spring, that is, by providing a structure for buffering torque transmission in the above torque transmission path, the force transmission is softened. That is, the welding force buffer structure of the present invention is constructed. Therefore, based on the same principle of the embodiment, those skilled in the art should know that the specific implementation manner of the welding force buffer structure can be various, for example, the embodiment can be improved, and only one of the welding force buffer structures is retained.
  • a spring combination or only a compression spring between the welding force conducting structure and the electrode force conducting structure (such as a compression spring 210 disposed between the upper portion of the small shaft 203, the middle shaft clamp 206 and the middle sliding shaft clamp 207, omitting the other three
  • the compression springs 211, 208, 209), as described above, belong to the welding force buffering structure proposed by the present invention and fall within the protection scope of the present invention.
  • the compression springs 208, 209 when they are built in the center shaft 204, they can serve as a buffering function as described above, and can be regarded as a part of the welding force buffer structure, but from another function Viewed from the viewing angle, by adjusting the compression position of the springs 208, 209, it further functions as a precise electrode force presetting and following structure.
  • the present invention is provided with an electrode force circuit 216 at the front end of the head frame 201, and the precise electrode force presetting structure and the electrode force circuit 216 constitute the precise electrode force presetting device of the present invention.
  • the upper and lower compression springs 208, 209 are fixed at the factory, and the reaction force of the external force is also established.
  • the precise electrode force presetting device includes a precise electrode force presetting structure and an electrode force circuit 216.
  • the precise electrode force presetting structure can be implemented in addition to the following structure as shown in FIG.
  • the pressure sensor structure is realized, and the electrode force circuit is electrically connected to a host on which a welding power source and a spot welding power source control device are installed.
  • the compression springs 208 and 209 play a very ingenious role in the above embodiments, and can function as a welding force buffering and a follow-up maintaining structure, and can also serve as an accurate electrode force.
  • the role of the pre-set structure is not necessary implementations for the two structures, and may be It is replaced in the embodiment; however, the use of compression springs 208, 209 can achieve both structures at the same time, which is obviously a better solution. Those skilled in the art should have a clear understanding of this.
  • the welding force breaking device comprises an electromagnet structure and an electromagnet circuit for driving the electromagnet structure
  • the electromagnet structure comprises an electromagnet and an adsorption iron block
  • the electromagnet and the adsorption iron block are respectively mounted on the fixing member of the spot welding machine head
  • the electromagnet circuit is electrically connected to the electrode force circuit of the precise electrode force presetting device.
  • the electromagnet structure When the electromagnet circuit is turned on, the electromagnet in the electromagnet structure is driven to adsorb the adsorbed iron block.
  • the electromagnet structure must have a reset member, and the reset member refers to a member that is returned to the original position by the adsorbed iron block adsorbed by the electromagnet when the electromagnet circuit is disconnected.
  • the reset member There may be various kinds of the reset member, and a known structure such as a tension spring, a permanent magnet having a polarity opposite to that of the electromagnet, etc., which can assist the reset of the adsorbed movable member, may be used, as those skilled in the art will not know.
  • FIG. Fig. 2 is a structural schematic view showing that an electromagnet and an absorbing iron block are respectively mounted on a fixing member and a movable member of a spot welding machine head.
  • an electromagnet 217 is mounted on the upper frame of the head frame 201
  • an adsorption iron block 218 is attached to the adsorption surface adjacent to the electromagnet
  • a reset member 219 is attached to the upper ends of the center shaft 204 and the slide shaft 205.
  • the absorbing iron block 218 and the reset member 219 are connected by means of the pivot pin 220.
  • the middle shaft 204 is adsorbed by the electromagnet 217 during the movement of the central shaft 204, and the central shaft 204 acts as a hindrance during the transmission of the welding force, thereby causing the cutting. effect.
  • the reset member 219 on the center shaft 204 is reset to force the external shaft 204 to be externally displaced and reset, thereby restoring the normal stress environment of the center shaft 204.
  • the present invention divides the structure of the spot welder head into a movable member and a fixed member, and is not limited to the understanding of the two parts of the upper frame and the centering shaft 204 of the head frame as in the prior art.
  • a person skilled in the art can be known by the description of the present invention, and the movable member referred to in the present invention includes a movable member such as a center shaft clamp 206, a middle shaft 204, a small shaft 203, a slide shaft clamp 207, a slide shaft 205, and the like; A frame or the like is fixed relative to the movable member. Any fixed or moving member,
  • the 218 and the reset element cooperate without being limited by the existing structure.
  • the precise electrode force pressing system described in the drawings includes a welding force transmission structure, a welding force buffer structure, an electrode force transmission structure, an electromagnet structure, an electromagnet circuit, a precise electrode force presetting structure, and an electromechanical circuit composed of an electromechanical force circuit.
  • the electrode force circuit plays an important role in the whole precision electrode force pressurization system; when welding the workpiece, firstly on the precise electrode force presetting device, through the electrode force
  • the circuit inputs the electrode force to be preset in a quantitative manner, and then, during operation, the welding power source supplies a welding force to the welding force conductor, and when the electrode force circuit detects that the welding force reaches a preset value, the electrode force circuit
  • a command is issued to the welding power source to turn on the spot welding power source, and on the other hand, a command is issued to the electromagnet circuit to conduct the electromagnet to adsorb the adsorption iron block, and the electromagnet structure is to sway the welding force transmission structure. Preventing torque conduction to prevent excessive welding force from acting on the electrode;
  • the welding consumables for electric resistance welding are generally less than 0.10 mm.
  • the present invention employs a welding force swaying device that is not affected by the height difference of the weldment, and the prior art is swayed. They are all designed with stroke limit.
  • the servo motor with the best precision in the prior art has a stroke limit accuracy of less than 0.01mm, but it often cannot meet the requirements of resistance welding micro-welding because of the welder.
  • the height difference of the pieces is 0.03 mm, and the servo motor has no problem with the error of the workpiece by the stroke limit.
  • the invention triggers the working signal of the electromagnet at the same time by the trigger signal of the spot welding power source, so the tilting of the present invention Completely unaffected by the height difference of the weldment; after the spot welding operation is completed, the electrode force circuit disconnects the spot welding current provided by the spot welding power source, and at the same time instructs the welding force breaking device to return to the original state, that is, completes a spot welding process;
  • the pressurization system maintains the electrode force at ⁇ 0.5N throughout the welding time
  • the electromechanical integrated electrode force pressing system of the present invention combines the synergistic effect of the welding force swaying device and the welding force buffering structure by the precise electrode force presetting device. Restricted to each other, the electrode force is maintained within a predetermined range and remains relatively constant throughout the spot welding period.
  • the present invention further discloses a method of wrapping the micro-joining of the cobalt-based amorphous wire.
  • cobalt-based amorphous wire is not only hard and brittle, but also has poor solderability, and its magnetic properties disappear at a high temperature (1150 ° C), high temperature cannot be used for connection, and a sensor is required at the same time.
  • the oxide film on the surface of the cobalt-based amorphous wire must be completely removed so that the DC resistance value of the contact with the electronic component tends to zero.
  • Such harsh conditions make the connection of the cobalt-based amorphous wire in the sensor circuit very difficult. Therefore, cobalt-based amorphous wires can be said to be typical of small workpieces with poor solderability. As long as the cobalt-based amorphous wires can be reliably connected to the sensor circuit, other small workpieces with poor solderability can also be reliably connected.
  • circuit structure of the cobalt-based amorphous wire sensor will be first described before explaining the wrap-welded micro-join of the cobalt-based amorphous wire of the present invention.
  • the circuit 301 of the cobalt-based amorphous wire sensor is a printed wiring board circuit having two connection pads 302 disposed on the printed wiring board circuit.
  • An insulating sleeve 303 is disposed between the two connection pads 302.
  • the insulating sleeve 303 is wound with two sets of coils 304 for supplying alternating current; the cobalt-based amorphous wires 307 are penetrated through the insulating sleeve 303, and both ends are They are respectively connected to the two connection pads 302; the two sets of enameled wire lead wires 305 are respectively soldered on the four pads 306 of the two sets of enameled wire coil lead-out contacts.
  • the circuit of the cobalt-based amorphous wire sensor can be designed as a circuit structure of a patch, or can be designed as a circuit structure with a skeleton-like pin.
  • the circuit of the cobalt-based amorphous wire sensor of the present embodiment is a printed circuit board circuit, and the structure thereof is relatively easy to be tinned on the connection pad with respect to the circuit structure of the skeleton-like pin or the circuit structure of the patch.
  • Spray tin process also has a very good printed circuit board It is easy to process the positioning holes for another weldment, and it is easy to machine the positioning holes or the positioning tips for the enameled wire lead wires of the two sets of coils.
  • the circuit of the cobalt-based amorphous wire sensor adopts the structure of the printed circuit board circuit, and the HPPR is more convenient to adopt.
  • the micro-welding apparatus performs a micro-bonding of the cobalt-based amorphous wire 307 by a resistance welding single-side spot welding.
  • a wrap-weld micro-joining method for a cobalt-based amorphous wire of the present invention includes:
  • connection pad 302 includes a printed wiring board copper foil 402 and a tin layer 403 sprayed on the copper foil 402.
  • the tin layer has a thickness of about 0.10 mm, and the connection pad 302 is also referred to as a substrate soldering member; the package soldering member 405 is plated.
  • Tin-copper tape in Figures 3 and 4, the diameter of the cobalt-based amorphous wire 307 is 00.03 mm, the large separation between the two connection pads 302 is 8 mm, and the size of the pad 302 is lmm x lmm; 405 is a tinned copper strip having a width of 0.10 mm and a thickness of 0.04 mm, and the tin plating layer is about 0.02 mm thick; however, in other embodiments, the above parameters may be changed;
  • Cobalt-based amorphous wire 307 is placed on the connection pad 302 of the sensor circuit, and the cobalt-based amorphous wire 307 is covered with a wrap weld 405, and the wrap weld 405 is welded by a parallel electrode horn through a resistance welding spot welding device. Spot welding
  • the electric resistance welding spot welding apparatus used in the structure of the package welding micro connection is preferably the above HPPR micro welding apparatus
  • the parallel electrode welding head used is preferably a parallel electrode welding head with a concave arc end surface, and is used.
  • the welding pressure is set at 5.0N
  • the output pulse voltage is set at 0.6V
  • the output pulse time is set at 8ms.
  • the wrap weld 405, which is shown as a lap joint on the connection pad 302, is soldered.
  • the invention may also be fabricated using electrode tip contact parallel electrode horns.
  • the tensile test of the cobalt-based amorphous wire 307 after welding in the example shown in Fig. 4 showed that the tensile strength was 105 g, and the resistance value of the cobalt-based amorphous wire 307 was 16 ⁇ .
  • the longitudinal inspection of the cobalt-based amorphous wire 307 and the solder joint after the welding of the embodiment shown in Fig. 4 revealed that the cobalt-based amorphous wire 307 was not crushed and deformed, and the cylindrical surface of 00.03 mm was still retained;
  • the surface of the crystal wire 307 is silvery white, surrounded by a tin layer, that is, no oxide film is found on the surface of the cobalt-based amorphous wire 307;
  • the longitudinal section of the solder joint can also be seen on both sides of the wrap weldment 405 and the connection pad 302.
  • the interdiffusion and recrystallization of copper metal indicates that the connection between the two is a solid phase connection metallurgical structure of a typical resistance spot welding.
  • the resistance value of the cobalt-based amorphous wire 307 having a length of 8 mm should be 16 ⁇ , which is the same as the experimental result, indicating that the cobalt-based amorphous
  • the DC resistance values of the two contacts of the wire 307 connected to the two connection pads 302 are close to zero;
  • the cobalt-based amorphous wire 307 is securely joined by a wrapped weldment 405 and a connection pad 302 which are solid-phase bonded.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Resistance Welding (AREA)

Abstract

L'invention porte sur une structure de micro-raccordement à soudage à enveloppement, laquelle structure comprend une minuscule pièce à travailler (101) avec une médiocre aptitude au soudage, et deux éléments de soudure, à savoir un élément de soudure de base (103) et un élément de soudure d'enveloppement (102). La minuscule pièce à travailler avec une médiocre aptitude au soudage est disposée entre l'élément de soudure de base et l'élément de soudure d'enveloppement qui se chevauchent mutuellement, et l'élément de soudure de base et l'élément de soudure d'enveloppement sont soudés par points à l'aide d'un équipement de soudage par points à soudage à résistance (100), de telle sorte que la minuscule pièce à travailler avec une médiocre aptitude au soudage est étroitement enveloppée par les deux éléments de soudure soudés l'un à l'autre, de façon à obtenir la liaison avec l'élément de soudure de base. L'invention porte également sur un procédé de micro-raccordement à soudage à enveloppement pour fil amorphe à base de cobalt. La structure de micro-raccordement à soudage à enveloppement mentionnée ci-dessus réalise le raccordement fiable de la minuscule pièce à travailler et de l'élément de soudure de base, de façon à résoudre efficacement le problème de difficulté du soudage de minuscules pièces à travailler avec une médiocre aptitude au soudage.
PCT/CN2014/083933 2014-05-25 2014-08-07 Structure de micro-raccordement à soudage à enveloppement et procédé de micro-raccordement à soudage à enveloppement pour fil amorphe à base de cobalt WO2015180263A1 (fr)

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CN104174985B (zh) * 2014-05-25 2016-09-07 广州微点焊设备有限公司 包裹焊微连接的结构及钴基非晶丝的包裹焊微连接方法
CN105665909A (zh) * 2016-04-22 2016-06-15 贵州航天精工制造有限公司 一种搭铁线组件的焊接方法
CN107570852A (zh) * 2017-08-25 2018-01-12 中国电子科技集团公司第四十八研究所 一种太阳电池片焊接系统及焊接方法
CN108723566B (zh) * 2018-08-06 2021-08-13 常州铭赛机器人科技股份有限公司 冲压电阻焊焊接系统及其焊接方法
CN113134658B (zh) * 2021-05-03 2022-11-11 东北石油大学 非接触电磁超声辅助焊接设备

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