CN111515507A - Micro resistance welding spot welding equipment - Google Patents
Micro resistance welding spot welding equipment Download PDFInfo
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- CN111515507A CN111515507A CN202010228697.3A CN202010228697A CN111515507A CN 111515507 A CN111515507 A CN 111515507A CN 202010228697 A CN202010228697 A CN 202010228697A CN 111515507 A CN111515507 A CN 111515507A
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- 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
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- 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
- B23K11/30—Features relating to electrodes
- B23K11/31—Electrode holders and actuating devices therefor
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- 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
- B23K11/36—Auxiliary equipment
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Abstract
The invention discloses a micro resistance welding spot welding device, which comprises: the spot welding machine head comprises a machine head frame, the machine head frame is arranged on a machine head bottom plate through a machine head upright post, and a welding head clamp is arranged below the machine head frame; the parallel electrode welding head is arranged on the welding head clamp; the spot welding machine host is provided with a pulse output power supply and is electrically connected with a welding head clamp on the spot welding machine head through an output cable; the machine head frame is arranged on the machine head upright post through a height adjustable device, and the position of the machine head frame relative to the machine head upright post can be adjusted up and down. The invention provides a machine head frame of a spot welding machine main body, which is arranged on a machine head upright post through a height adjustable device, wherein the height adjustable device comprises a compact integrated structure formed by a slide block sliding shaft and a rack and pinion shaft, and the height of a spot welding machine head on a machine head bottom plate and the stable installation of the spot welding machine head on the machine head upright post are flexibly adjusted through a hand wheel.
Description
Technical Field
The invention belongs to the field of resistance welding, and particularly relates to a micro-resistance welding spot welding device.
Background
Resistance welding spot welding belongs to pressure welding, and in the micro resistance welding spot welding equipment of the related art, the spot welding machine head adopts a fixed stable structure, and when workpieces with different heights are welded, the height of a workbench is generally required to be adjusted.
However, the micro resistance welding has small welded workpiece and small workbench, and it is very difficult to install a height adjustable device on the small workbench, especially the micro resistance welding often needs automatic spot welding, and the height adjustment of the workbench of the automatic spot welding is more difficult.
In view of the above, it is necessary to provide a micro resistance welding spot welding apparatus whose position can be adjusted up and down.
Disclosure of Invention
The invention aims to: overcomes the defects of the prior art and provides the micro resistance welding spot welding equipment with the position capable of being adjusted up and down.
In order to achieve the above object of the invention, the present invention provides a micro resistance welding spot welding apparatus, comprising:
the spot welding machine head comprises a machine head frame, the machine head frame is arranged on a machine head bottom plate through a machine head upright post, and a welding head clamp is arranged below the machine head frame;
the parallel electrode welding head is arranged on the welding head clamp; and
the spot welding machine host is provided with a pulse output power supply and is electrically connected with a welding head clamp on the spot welding machine head through an output cable;
the machine head frame is arranged on the machine head upright post through a height adjustable device, and the position of the machine head frame relative to the machine head upright post can be adjusted up and down.
As an improvement of the micro resistance welding spot welding equipment, the height-adjustable device comprises a first metal component arranged on a machine head frame and a second metal component arranged on a machine head upright post, a sliding block and a longitudinal rack positioned in the middle of the sliding block are arranged on the inner side surface of the first metal component, a sliding groove matched with the sliding block and a transverse gear shaft matched with the longitudinal rack are arranged on the inner side surface corresponding to the second metal component, a hand wheel is arranged at the tail end of the transverse gear shaft, and the transverse gear shaft is driven by the hand wheel to drive the machine head frame to move up and down on the sliding shaft of the sliding block on the longitudinal rack.
As an improvement of the micro-resistance welding spot welding equipment, the fixed part of the height adjustable device is formed by installing the second metal component and the machine head upright post, the movable part is formed by installing the first metal component and the machine head frame, and the height of the machine head frame relative to the position of the machine head upright post is adjusted by rotating the hand wheel.
As an improvement of the micro resistance welding spot welding equipment, the height adjustable device is provided with a locking structure, the locking structure comprises a side metal plate arranged on the outer side surface of the movable part and a fastening screw arranged on the side metal plate, and the movable gap between the first metal component and the second metal component of the height adjustable device can be adjusted or locked by loosening/locking the fastening screw.
As an improvement of the micro resistance welding spot welding equipment, the spot welding machine head is provided with a welding wire feeding device, the welding wire feeding device comprises a support arranged on the front end face of a machine head frame, a small wheel arranged above the support and wound with a thin welding wire, a wire clamping small wheel arranged below the support and a parallel electrode welding head provided with a longitudinal through hole or a through groove, and the parallel electrode welding head is arranged on a welding head clamp.
As an improvement of the micro resistance welding spot welding equipment, the parallel electrode welding head arranged on the welding head clamp is provided with a positioning structure, the positioning structure comprises a protruding positioning body arranged on the outer side of the clamping end of the parallel electrode welding head, and a groove matched with the protruding positioning body is arranged at the corresponding position of the parallel electrode welding head clamped by the welding head clamp.
As an improvement of the micro resistance welding spot welding equipment, the protruding positioning body arranged outside the clamping end of the parallel electrode welding head is a positioning sheet or a positioning pin arranged outside the clamping end of the parallel electrode welding head.
As an improvement of the micro resistance welding spot welding equipment, the positioning body arranged outside the clamping end of the parallel electrode welding head and the parallel electrode welding head are mutually insulated.
As an improvement of the micro resistance welding spot welding equipment, the protruding positioning body arranged outside the clamping end of the parallel electrode welding head is a U-shaped enameled wire arranged outside the clamping end of the parallel electrode welding head.
The spot welder host is a spot welder host which uses a constant voltage to regulate and control a pulse output power supply, and the constant voltage to regulate and control the pulse output power supply comprises a central control circuit, a preset pulse output voltage circuit, a preset pulse output time circuit, a network circuit and a network interface, wherein the preset pulse output voltage circuit, the preset pulse output time circuit, the network circuit and the network interface are electrically connected with the central control circuit.
As an improvement of the micro resistance welding spot welding equipment, a network switch is arranged between the electrically connected central control circuit and the network circuit, and the preset pulse output voltage preset pulse time circuit is set by a dial switch, wherein when the network switch is closed and the dial switch is switched on, a pulse output power supply is controlled to output pulses by a manual dial switch; when the network switch is switched on and the dial switch is switched off, the network interface is externally connected with an industrial control computer, so that communication transmission, monitoring regulation and control and record storage of real-time welding electrical parameters through a network are realized.
Compared with the prior art, the micro resistance welding spot welding equipment has the beneficial technical effects that:
1. the spot welding machine head forms a compact height adjustable device or a height adjustable device with a locking structure through a sliding block sliding groove and a rack and pinion, and the stable installation of the spot welding machine head on the machine head stand column through flexibly adjusting the height of the spot welding machine head on the machine head bottom plate through a hand wheel is realized.
2. The spot welding machine head is provided with a welding wire feeding device, the welding wire feeding device comprises a support arranged on the front end face of a machine head frame, a small wheel for winding a thin welding wire, a small wire clamping wheel and a longitudinal through hole or a through groove, the small wheel is arranged on the support, the small wheel is wound on the thin welding wire, the longitudinal through hole or the through groove is arranged on a parallel electrode welding head, the welded wire passes through the through hole or the through groove of the parallel electrode welding head arranged on a welding head clamp and is fed to a welded workpiece, and the feasible welding wire feeding device is provided for manufacturing electronic component workpieces without welding wires.
3. The parallel electrode welding head arranged on the welding head clamp is provided with a positioning structure, the positioning structure comprises a protruding positioning body arranged on the outer side of the clamping end of the parallel electrode welding head, and a groove matched with the protruding positioning body is arranged at the corresponding position of the clamping end of the welding head clamp, which clamps the parallel electrode welding head. The positioning structure arranged on the parallel electrode welding head arranged on the welding head clamp can ensure that the arranged parallel electrode welding head cannot generate deviation.
4. On the basis of finding that the inherent resistance of the tip of the parallel electrode welding head is the real-time welding resistance, a pulse output power source regulated and controlled by constant voltage is provided, a network circuit and a network interface which are electrically connected with a central control circuit are provided, and transmission communication, record storage, monitoring and control of real-time welding electrical parameters by a network are realized through an external industrial control computer.
Drawings
The invention will be described in detail below with reference to the accompanying drawings and specific embodiments, in which:
FIG. 1 is a schematic structural view of a micro resistance spot welding apparatus according to the present invention.
Fig. 2 is a schematic structural view of a spot welder head of the micro resistance welding spot welding equipment of the invention, wherein a spot welder main body is removed.
FIG. 3 is a schematic perspective exploded view of a height adjustable device in the spot welding apparatus for micro resistance welding according to the present invention.
Fig. 4 is another schematic structural view of a spot welder head of the micro resistance spot welding apparatus of the present invention, in which a wire feeding device for a welding wire is shown.
Fig. 5 is a schematic structural diagram of a parallel electrode welding head and a top view of a longitudinal through hole or through groove provided in the parallel electrode welding head in the micro resistance welding spot welding apparatus of the present invention.
FIG. 6 is a schematic diagram of a parallel electrode bonding tool and a bonding tool holder with a positioning structure.
FIG. 7 is a schematic block diagram of a circuit in which a constant voltage regulated pulse output power supply is connected to a network in the micro resistance spot welding apparatus of the present invention.
Detailed Description
In order to make the objects, technical solutions and technical effects of the present invention more clear, the present invention will be further described in detail with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
For convenience of description and initial knowledge of the resistance spot welding equipment of the present invention, the following substitutions are made for the technical parameters of the structure including the main machine of the spot welding machine, the spot welding head, the frame of the head, the column of the head, the clamp of the head, etc., which are related to the present embodiment, and if not necessary, the technical parameters will not be described repeatedly in the description of the embodiment.
The pulse output power source installed in the main machine box of the spot welding machine of the embodiment comprises a power transformer, a pulse output transformer, a main circuit board and the like, wherein the pulse output voltage and the pulse output time are preset, the maximum pulse output current is 1000A, the pulse output voltage is 0-1.99V, the pulse output time is less than 39.9ms, and the size of the main machine box is 40 × 30 × 25cm (length, width and height). The frame of the machine head is a metal frame which is formed by casting or processing, the outer frame of the frame is about 20 x 12 x 8cm (length, width and height), and the peripheral frame of the frame is about 2cm thick. The upright post of the machine head adopts a metal bar or a pipe with the diameter of 25-30. The tip holder consists of two metal clamping blocks that hold the electrodes, and the size of the tip holder is about 100 x 40 x 15mm (length x width x thickness).
First, a structure in which a head frame of a spot welding head is mounted on a head column via a height-adjustable device will be described.
Referring to fig. 1 to 7, the present invention provides a micro resistance spot welding apparatus, which includes:
the spot welding machine head 100 comprises a machine head frame 104, wherein the machine head frame 104 is arranged on a machine head bottom plate 101 through a machine head upright post 106, and a welding head clamp 105 is arranged below the machine head frame 104;
a parallel electrode horn 102 mounted on a horn holder 105; and
the spot welding machine main machine 103 is provided with a pulse output power supply, and the spot welding machine main machine 103 is electrically connected with a welding head clamp 105 on the spot welding machine head 100 through an output cable;
the machine head frame 104 is mounted on a machine head upright post 106 through a height adjustable device 107, the machine head upright post 106 is mounted on the machine head base plate 101, and the position of the machine head frame 104 relative to the machine head upright post 106 can be adjusted up and down.
Referring to fig. 1 to 3, the height adjustable device 107 includes a first metal member 201 adapted to mount the head frame 104 and a second metal member 202 adapted to mount the head column 106, a sliding block 203 is mounted on an inner side surface of the first metal member 201, and a longitudinal rack 204 is mounted in the middle of the sliding block 203. The inner side surface corresponding to the second metal member 202 is provided with a sliding groove 205 matched with the sliding block 203 and a transverse toothed shaft 206 meshed with the longitudinal rack 204, the tail end of the transverse toothed shaft 206 is provided with a hand wheel 207, the rotation of the hand wheel 207 drives the transverse toothed shaft 206 to rotate, and the spot welder head 101 is driven to move up and down through the matching of the transverse toothed shaft 206 and the longitudinal rack 204. In order to increase the sliding performance of the slider 203 on the transverse shafts 206 and to reduce the mutual clearance, balls are generally mounted on the transverse shafts 206. Thus, the first metal member 201 and the second metal member 202 can be integrally installed through the sliding block 203, the sliding groove 205, the longitudinal rack 204, the tooth slot 206 and the hand wheel 207.
Referring to fig. 1 to fig. 3, the second metal member 202 and the handpiece upright 106 form a fixed portion of the height adjustable device, the other end of the handpiece upright 106 is mounted on the handpiece base plate 101, and the first metal member 201 and the handpiece frame 104 form a movable portion. At this time, as long as the handwheel 207 is rotated, the transverse gear shaft 206 can be driven to drive the longitudinal rack 204 and the slider 203, so that the height of the handpiece frame 104 on the handpiece upright column 106 can be flexibly adjusted. In other words, the height of the handpiece frame 104 relative to the handpiece column 106 can be adjusted by rotating the handwheel 207.
In this embodiment, the height-adjustable device formed by the slider, the sliding shaft, the rack, and the pinion is very compact in structure, and can meet the use requirement of stable installation of the spot welding machine head 100 of the micro-resistance welding equipment on the machine head upright post 104, and increase the installation stability of the spot welding machine head 100.
Referring specifically to fig. 2, according to an embodiment of the present invention, the height-adjustable device 107 is further provided with a locking structure, which includes a side metal plate 210 disposed on the outer side of the movable portion of the height-adjustable device 107 and fastening screws 208, 209 mounted on the side metal plate. When the position of the spot welder head 100 on the head column 106 needs to be adjusted, the set screw 208 arranged on the movable part side metal plate 210 is loosened, and after the height of the spot welder head 100 is adjusted, the set screw 208 is locked. It can be understood that the side metal plate 210 is provided with a through slot to ensure the moving stroke of the height adjustable device, so as to meet the requirement of flexibly adjustable and stable installation of the head frame 104 of the spot welding head 100 at the position of the head column 106.
Since the side metal plate 210 and the second metal member 202 may be fastened together, and the side metal plate 210 and the second metal member 202 may be formed into an integral structure, it is also within the scope of the present invention that the side metal plate 210 and the second metal member 202 are formed into an integral structure.
The structure of the thin wire feeding device provided in the wire bonder head 100 will be described.
Referring to fig. 4 and 5, the spot welder head 100 is provided with a wire feeding device 300, the wire feeding device 300 includes a bracket 303 mounted on the front end surface of the head frame 104, a small wheel 302 mounted above the bracket 303 for winding a thin welding wire 301, a wire clamping small wheel 304 mounted below the bracket, and a longitudinal through hole or through groove 405 provided on the parallel electrode welding head 102, and the parallel electrode welding head 102 provided with the longitudinal through hole or through groove 405 is mounted on the welding head clamp 105.
It should be noted that a small spring is installed at the rear end of small wire clamping wheel 304, and small wire clamping wheel 304 can ensure that thin welding wire 301 has a certain tension and thin welding wire 301 installed on small wheel 302 is not loosened. Hereinafter, the parallel electrode horn 102 and the longitudinal through-hole or through-groove 405 provided in the parallel electrode horn 102 will be described.
Referring to fig. 5, the parallel electrode horn 102 is constructed to include two parallel electrodes and a spacer insulator layer 402 that integrally secures the two electrodes together, and the parallel electrode horn 102 includes a horn body 401, a clamping end 403, and a horn tip 404. As shown in fig. 5, the present embodiment proposes that a longitudinal through-hole or through-groove 405 is provided on the outer side surface of the clamping end 403 of the parallel electrode bonding tool, and the wire to be bonded or the tape to be bonded can pass through the through-hole or through-groove 405 and be guided to the tip of the parallel electrode bonding tool.
It should be noted that, the conventional parallel electrode welding head 102 is made of cylindrical tungsten-molybdenum material, and the length is generally about 30mm, and it is difficult to machine a longitudinally elongated through hole on the outer side surface of the hard cylindrical tungsten-molybdenum parallel electrode welding head 102. A more feasible method is to machine through grooves in parallel electrode welding heads. A small part of the processed outermost side of the through groove is closed, and the through groove which closes the outermost side part can also be called a through hole; alternatively, as shown at 405 in fig. 5, the machined through-grooves may not be closed, and therefore, in the present embodiment, it is referred to as providing longitudinal through-holes or through-grooves on the outer side surfaces of the parallel electrode horn.
The operation of fine wire feeding device 300 in the spot welding operation of the present embodiment will be described with reference to fig. 4 and 5. Firstly, a small wheel 302 wound with a thin welding wire 301 is arranged on a bracket 303, a leading-out part of the thin welding wire or a thin welding belt 301 is clamped on a wire clamping small wheel 304, a leading-out end of the thin welding wire penetrates through a through hole or a through groove 405 on a parallel electrode welding head 102, at the moment, the leading-out end of the thin welding wire can be welded through the parallel electrode welding head 102, after a first welding point is welded, the thin welding wire 301 can be pulled to the next welding position by translating a workpiece, and the wire feeding of the thin welding wire by a thin welding wire feeding device 300 is realized.
The following describes mounting of a positioning structure on the tip holder in parallel with the electrode tip arrangement.
The parallel electrode welding heads in the prior art are all cylindrical structures, and the advantages of the cylindrical flat electrode welding heads include that the parallel electrode welding heads are easily installed on a welding head clamp provided with a clamping round hole, and can be in close mutual contact through the parallel electrode welding heads, so that the large current for welding can be favorably passed through. However, when the cylindrical parallel electrode welding head is installed, the installation offset of the parallel electrode welding head is easy to occur, which affects the accurate positioning of the tip of the welding head on a welding piece and the welding quality. In view of the above, the present application proposes mounting a positioning structure on the horn clamp in parallel with the electrode horn arrangement.
Fig. 6 is a schematic structural diagram of a parallel electrode welding head and a welding head clamp with a positioning structure.
As shown in fig. 6, the parallel electrode welding head 102 mounted on the head clamp 105 of the spot welder head 100 is provided with a positioning structure, the positioning structure comprises a protruding positioning body 601 arranged outside the clamping end 403 of the parallel electrode welding head, and a groove 602 adapted to the protruding positioning body 601 is arranged at a corresponding position where the head clamp 105 clamps the parallel electrode welding head 102.
Regarding the structure of the protruding positioning body 601, a part of the positioning body 601 can be embedded between the insulating spacer layer 402 between the two electrodes of the parallel electrode welding head 102, so that the positioning body 601 and the parallel electrode welding head 102 form an integrated structure.
The positioning body 601 can adopt a positioning sheet with a sheet structure; or the small round rod is processed into an L shape, one end of the L-shaped small round rod is embedded into the insulating spacing layer 402 of the parallel electrode welding head, and the other end of the L-shaped small round rod forms a structure like a positioning pin. It will be appreciated that the structure of the spacer 601 is required to ensure that it is insulated from the parallel electrode horn 102.
Alternatively, the positioning body 601 may be configured by installing an insulating sleeve outside the clamping end 403 of the parallel electrode welding head 102, and the insulating sleeve is provided with a positioning piece or a positioning pin protruding out of the parallel electrode welding head 102, so that the configuration of installing the insulating sleeve outside the clamping end 403 of the parallel electrode welding head 102 also falls into the scope of protection of the present embodiment.
The structure of the electrode holder 105 includes a structure in which the positive and negative electrodes are provided on the left and right electrode holders as shown in fig. 2, and a structure in which the positive and negative electrodes are provided on the front and rear electrode holders as shown in fig. 6.
Fig. 6 shows a preferred configuration for providing the protruding locating bodies on the parallel electrode horn: as shown in fig. 6, the protruding positioning body 601 is a U-shaped enameled wire disposed outside the clamping end 403 of the parallel electrode welding head 102, and is configured to embed two ends of the U-shaped enameled wire into the insulating space 402 between the two electrodes of the clamping end 403 of the parallel electrode welding head. With the structure, the U-shaped enameled wire and the parallel electrode welding head form a stable integrated structure.
Since the cylindrical parallel electrode welding head is provided with the protruding positioning body 601, it can be understood that the welding head clamp 105 shown in fig. 6 is provided with the groove 602 adapted to the protruding positioning body at the corresponding position for clamping the parallel electrode welding head 102, and when the protruding positioning body 601 of the parallel electrode welding head 102 is opposite to the groove 602 on the welding head clamp, the parallel electrode welding head 102 can be installed quite centrally.
The spot welder main unit 103 connected to the network will be described in detail below.
The micro-resistance welding spot welding equipment has the advantages that welded workpieces are very tiny, the welding reliability cannot be judged by naked eyes, and meanwhile, the workpieces often relate to the industries of aerospace, military communication, medical treatment and the like, so that a spot welding machine main machine can transmit communication, record storage, monitor and regulate various real-time welding electrical parameters including pulse output energy (J), pulse output current (I), pulse output voltage (V), pulse output time (T) and welding resistance value (R) through a network.
In the prior art, a pulse output power supply of resistance welding spot welding equipment is mostly in a constant current regulation and control mode, and the resistance welding spot welding equipment is generally provided with a current sensor for detecting the pulse output current, so that the constant current regulation and control pulse output power supply can realize welding operation only by presetting the pulse output current (I) and the welding time (T). However, the prior art resistance pad welding apparatus does not have the need for a network connection in this respect because the pulsed output power source with constant current regulation does not read the real-time welding electrical parameters described above.
The electrical parameter of the pulse output energy (J) is the most important electrical parameter for determining the quality of the weld, and relates to Joule's law J ═ I2RT, in other words, joule's law is that a pulsed output current I is passed through the work piece, and at a set time (T), the resistance (R) between the metal of the work piece generates heat (J). Therefore, to obtain the electrical parameters of the real-time pulse output energy J, in addition to the value of the pulse output current (I) and the value of the pulse output time (T), the real-time welding resistance value (R) must be obtained.
The real-time welding resistance value (R) is the contact resistance value between two electrodes and the welded piece, and also has two welded pieces, because the factor that influences the contact resistance value is many, including unpredictable electrode strength size, unpredictable electrode temperature variation etc. consequently, to how to obtain real-time welding resistance value (R), is the technological problem in resistance welding field always.
The parallel electrode welding head applied to the micro resistance welding spot welding equipment comprises a welding head with two electrodes connected at the tip end of the welding head or a parallel electrode welding head with two electrodes in ohmic contact at the tip end of the welding head. During welding, the tip of the welding head has a relatively fixed resistance value (R), electric sparks are generated when current passes through the welding head, on one hand, the exposed metal wire of the insulating layer on the welded piece (enameled wire) is burnt out, and then, under the action of electrode force, welding current enters the two welded pieces to realize resistance welding.
The inventors of the present application found that the pulse output energy generated by the intrinsic resistance of the tip of the welding head of the above-described welding head tip integrated type or ohmic contact type parallel electrode welding head during welding is the pulse output energy generated during welding of a weldment, and the inventors reached this conclusion through the following experiments.
Experiment I, a welding head tip ohmic contact type parallel electrode welding head (R1) is used, the resistance value of a normal temperature R1 tip is detected to be 8.0m omega by a micro-ohm meter, R1 is installed on a micro resistance welding spot welding machine, and three welding parameters are preset:
pulse output voltage V1 is 1.0V, pulse output time T1 is 10ms, electrode force F1 is 5N (20OZ), a phi 0.08mm enameled wire is subjected to spot welding on an iron-nickel substrate at a normal temperature state, a reliable welding effect can be obtained, and detected pulse output current I is 125A;
then, at normal temperature and without changing the three welding parameters, the parallel electrode welding head R1 does not perform spot welding on the weldment but turns on the welding current in the air (called as idle welding, the same applies hereinafter), and at this time, the detected pulse output current is 125A;
subsequently, at normal temperature, only changing preset pulse output voltage V1 to 0.8V, keeping pulse output time T1 and electrode force F1 unchanged, performing spot welding on a phi 0.08mm enameled wire on a wire substrate by using a parallel electrode welding head R1, and detecting pulse output current I to 100A;
then, the parallel electrode horn R1 was idle welded at room temperature without changing the above three preset sets of welding parameters, and the pulse output current I was detected to be 100A in the same manner.
Experiment two, with a welding head tip integrated parallel electrode welding head (R2), the resistance value of a normal temperature R2 tip is 3.0m omega through a micro-ohm meter detection, R2 is installed on a micro resistance welding spot welding machine, and three welding parameters are preset:
the pulse output voltage V2 is 1.2V, the pulse output time T2 is 10ms, the electrode force F2 is 5N (20OZ), the enamelled wire with the diameter of 0.08mm is spot-welded on the iron-nickel substrate in a normal temperature state, the reliable welding effect can be obtained, and the detected pulse output current I is 400A;
then, at normal temperature and without changing the three welding parameters, the parallel electrode welding head R2 does not perform spot welding on the weldment but connects the welding current in the air (called blank welding, the same applies hereinafter), and at this time, the detected pulse output current is 400A;
subsequently, at normal temperature, only changing preset pulse output voltage V2 to 1.0V, keeping pulse output time T2 and electrode force F2 unchanged, performing spot welding on a phi 0.08mm enameled wire on a wire substrate by using a parallel electrode welding head R2, and detecting pulse output current I to 333A;
next, the parallel electrode horn R2 was empty-welded at room temperature without changing the above three preset sets of welding parameters, and the pulse output current I was similarly 333A.
It should be noted that, in the above experiment, the two parallel electrode welding heads were tested by soaking in cold water, and therefore, it can be considered that the temperatures of the two parallel electrode welding heads in each experiment are the same.
Summarizing the two experiments and the experimental results, the two parallel electrode welding heads comprise reliable welding and poor welding, and the real-time pulse output currents of the welding and the idle welding are completely the same; because the welding head tip is tested in a normal temperature state, the resistance value of the welding head tip is not changed, according to the Joule law, the real-time pulse output energy of the tests can be calculated, and the welding head tip connection or the welding head tip ohmic contact type parallel electrode welding head is disclosed, wherein the inherent resistance value of the welding head tip is the resistance value during welding. The experimental result solves the technical problem that the resistance welding cannot detect the real-time welding resistance value, and provides possibility for the micro resistance welding spot welding equipment to read various real-time welding electrical parameters.
Based on the pulse output power supply, the invention provides a pulse output power supply set by a spot welding machine host, which is a constant-voltage regulated pulse output power supply.
Fig. 7 is a schematic block diagram of a constant voltage pulse output power supply. The constant voltage regulation pulse output power supply comprises a central control circuit 701, a preset pulse output voltage circuit 702, a preset pulse output time circuit 703, a network circuit 710 and a network interface 711, wherein the preset pulse output voltage circuit 702 is electrically connected with the central control circuit 701, the network interface 711 is externally connected with an industrial personal computer 712 through the network interface 711, and communication transmission, monitoring regulation, recording and storage of real-time welding electrical parameters through a network are realized.
The constant voltage regulated pulse output power supply includes a preset pulse output voltage circuit 702 and a preset pulse output time circuit 703 electrically connected to the central control circuit 701. In this embodiment, the preset pulse output voltage and pulse output time are preset by the dial switch 704, and the pulse output power supply electrically connected to the central control circuit 701 further includes a power switch circuit 705 acting on the pulse output transformer 706 through the power switch circuit 705 to provide a pulse output current to the parallel electrode welding head 707; the pulse output transformer 706 is further provided with a current sensor and a negative feedback circuit 708 electrically connected with the central control circuit 701, so that the CPU on the central control circuit 701 can collect real-time pulse output voltage V, pulse output time T and pulse output current I, can also obtain a real-time welding resistance value R and real-time pulse output energy J through high-speed operation, and can display the real-time welding resistance value R and the real-time pulse output energy J through a real-time welding electrical parameter display circuit 709 electrically connected with the central control circuit 701.
It should be noted that, since the real-time resistance value R of the tip of the bonding tool varies with the temperature of the bonding tool tip, in order to ensure that the real-time pulse output energy J is relatively constant, the negative feedback circuit 708 and the central control circuit 701 of the embodiment have a regulation setting for the pulse output current amount, or a compensation setting for the pulse output current: when the temperature of the tip of the welding head is low and the resistance value is small, the pulse output current is increased; when the temperature of the tip of the welding head becomes high and the resistance value becomes large, the pulse output current is reduced, so that the relative constancy of the real-time pulse output energy is ensured, and the consistency and the stability of the welding quality are ensured.
On the basis, the present embodiment proposes to provide the network circuit 710 and the network interface 711, and the network circuit 710 and the network interface 711 are electrically connected to the central control circuit 701, since the electrical parameters on the central integrated circuit already include the pulse output voltage V, the pulse output time T, the pulse output current I, the pulse output energy J, and the welding resistance R. When welding operation is carried out, the data of the real-time welding electrical parameter display circuit can be recorded, stored, transmitted, monitored, regulated and controlled only by accessing the industrial control computer 712 to the network interface 711.
The network circuit 710 operates on the following principle in the central control circuit 701: because the network circuit 710 is connected with the central control circuit 701 provided with the CPU, and the central control circuit 701 is connected with the real-time welding electrical parameter display circuit 709, on one hand, the central control circuit 701 outputs the welding real-time electrical parameter data to the network circuit 710, and the network circuit 710 is connected with the industrial personal computer 712 through the network interface 711, so that the data of the real-time welding electrical parameter is transmitted to the industrial personal computer through a TCP/IP protocol, and the data is processed through the industrial personal computer. On the other hand, the industrial personal computer 712 can also make a data modification command for the preset pulse output voltage and the preset pulse time. Firstly, a modification instruction is made for real-time welding electrical parameters monitored by an industrial personal computer 712, the modification instruction is received by a network circuit 710 through a TCP/IP protocol, the network circuit 710 inputs the modification instruction into a central control circuit 701, the central integrated circuit 701 instructs a power switch circuit 705, and the power switch circuit 705 pushes output pulse current of a pulse output transformer 706, so that network regulation and control are realized through the industrial personal computer 712. The TCP/IP protocol proposed in this embodiment is a well-known protocol for network communication to network digital transmission, and the TCP/IP protocol is not described in this embodiment.
In addition, in this embodiment, a network switch 713 is provided between the network circuit 710 and the central control circuit 701, and the preset pulse output voltage circuit 702 and the preset pulse output time circuit 703 preset the pulse output voltage and the pulse output time through the dial switch 704, and the setting of the network switch 713, so that the micro resistance spot welding equipment of this embodiment can be connected to the network, and can also continue to maintain the original condition that the power is output by manually regulating and controlling the pulse: when the network switch 713 is turned off and the dial switch 704 is turned on, the present embodiment enters the dial switch 704 controlled manually to regulate the pulse output; when the network switch 713 is turned on and the dial switch 704 is turned off, the network circuit 710 of the present embodiment can be switched to the network interface 711 to connect the industrial computer 712, so as to realize the transmission, communication, monitoring, control, recording and storage of real-time welding electrical parameters through the network.
In combination with the above detailed description of the embodiments of the present invention, it can be seen that, compared with the prior art, the micro resistance spot welding equipment of the present invention has the following technical effects:
1. the spot welding machine head 100 forms a compact height adjustable device or a height adjustable device with a locking structure through the sliding chute 205 of the sliding block 203 and the toothed shaft 206 of the rack 204, and the flexible adjustment of the height of the spot welding machine head 100 on the machine head bottom plate 101 and the stable installation of the spot welding machine head 100 on the machine head upright post 106 through the handwheel 207 are realized.
2. The spot welding head 100 is provided with a welding wire feeding device 300, the wire feeding device 300 comprises a bracket 303 arranged on the front end face of a head frame 104, a small roller 302 arranged on the bracket 303 and used for winding a thin welding wire, a wire clamping small wheel 304 and a longitudinal through hole or through groove 405 arranged on a parallel electrode welding head 102, and the welded wire passes through the through hole or through groove 405 of the parallel electrode welding head 102 arranged on a welding head clamp 105 and is fed to a welded workpiece, so that the wire feeding device which is feasible is provided for manufacturing electronic component workpieces without the welded wire.
3. The parallel electrode welding head 102 mounted on the welding head clamp 105 is provided with a positioning structure, the positioning structure comprises a protruding positioning body 601 arranged on the outer side of the clamping end of the parallel electrode welding head 102, and a groove 602 matched with the protruding positioning body is arranged at the corresponding position of the welding head clamp 105 clamping the parallel electrode welding head 102. The positioning structure arranged on the parallel electrode welding head 102 arranged on the welding head clamp 105 can ensure that the arranged parallel electrode welding head 102 cannot generate deviation.
4. On the basis of finding that the inherent resistance of the tip of the parallel electrode welding head is the real-time welding resistance, a pulse output power source regulated and controlled by constant voltage is provided, a network circuit 710 and a network interface 711 which are electrically connected with a central control circuit 701 are provided, and transmission communication, record storage, monitoring and control of real-time welding electrical parameters by a network are realized through an external industrial control computer.
Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (11)
1. A micro resistance spot welding apparatus comprising:
the spot welding machine head comprises a machine head frame, the machine head frame is arranged on a machine head bottom plate through a machine head upright post, and a welding head clamp is arranged below the machine head frame;
the parallel electrode welding head is arranged on the welding head clamp; and
the spot welding machine host is provided with a pulse output power supply and is electrically connected with a welding head clamp on the spot welding machine head through an output cable;
the machine head frame is characterized in that the machine head frame is arranged on a machine head upright post through a height adjustable device, and the position of the machine head frame relative to the machine head upright post can be adjusted up and down.
2. A micro-resistance welding spot welding device according to claim 1, wherein the height adjustable device comprises a first metal member mounted on the machine head frame and a second metal member mounted on the machine head upright post, the inner side surface of the first metal member is provided with a slide block and a longitudinal rack positioned in the middle of the slide block, the inner side surface corresponding to the second metal member is provided with a sliding groove matched with the slide block and a transverse gear shaft matched with the longitudinal rack, the tail end of the transverse gear shaft is provided with a hand wheel, and the hand wheel is rotated to drive the transverse gear shaft to drive the longitudinal rack to drive the machine head frame to move up and down on the slide block sliding shaft.
3. A micro-resistance welding spot welding device according to claim 2, wherein the second metal member is mounted to form a fixed part of the height adjustable device with the head column, the first metal member is mounted to form a movable part with the head frame, and the adjustment of the height of the head frame relative to the head column is achieved by rotating the hand wheel.
4. A micro resistance welding spot welding apparatus according to claim 3, wherein said height adjusting means is provided with a locking structure comprising a side metal plate provided on an outer side surface of the movable portion and a set screw mounted on the side metal plate, and the adjustment/locking of the movable gap between the first metal member and the second metal member of the height adjusting means is achieved by loosening/locking the set screw.
5. A micro-resistance welding spot-welding apparatus according to claim 1, wherein said spot-welding head is provided with a wire feeding device, the wire feeding device comprising a holder mounted on a front end face of a frame of the head, a small wheel mounted above the holder for winding a thin wire, a wire clamping small wheel mounted below the holder, and a parallel electrode welding head provided with a longitudinal through hole or a through groove, the parallel electrode welding head being mounted on a head clamp.
6. A micro-resistance welding spot welding device according to claim 1, wherein the parallel electrode welding head mounted on the welding head clamp is provided with a positioning structure, the positioning structure comprises a protruding positioning body arranged outside the clamping end of the parallel electrode welding head, and a groove adapted to the protruding positioning body is arranged at the corresponding position where the welding head clamp clamps the parallel electrode welding head.
7. A micro-resistance spot welding apparatus according to claim 6, wherein said protruding positioning body provided outside the clamping end of the parallel electrode horn is a positioning piece or a positioning pin provided outside the clamping end of the parallel electrode horn.
8. A micro-resistance spot welding apparatus according to claim 6, wherein said positioning body provided outside the clamping end of the parallel electrode horn is insulated from the parallel electrode horn.
9. A micro resistance spot welding apparatus according to claim 6, wherein the protruding positioning body provided outside the clamping end of the parallel electrode welding head is a U-shaped enameled wire provided outside the clamping end of the parallel electrode welding head.
10. A micro resistance welding spot welding apparatus according to any one of claims 1 to 9, wherein the spot welding machine host is a spot welding machine host which outputs a power source by a constant voltage regulated pulse, and the power source by the constant voltage regulated pulse comprises a central control circuit and a preset pulse output voltage circuit, a preset pulse output time circuit, a network circuit and a network interface which are electrically connected with the central control circuit.
11. A micro resistance welding spot welding device according to claim 10, wherein a network switch is provided between the electrically connected central control circuit and the network circuit, and the preset pulse output voltage is set by a dial switch, wherein when the network switch is turned off and the dial switch is turned on, the pulse output power source is in a state of regulating and controlling pulse output by a manual dial switch; when the network switch is switched on and the dial switch is switched off, the network interface is externally connected with an industrial control computer, so that communication transmission, monitoring regulation and control and record storage of real-time welding electrical parameters through a network are realized.
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| CN110576249A (en) * | 2019-08-16 | 2019-12-17 | 广州微点焊设备有限公司 | Micro-resistance welding single-side welding machine |
| CN110587093A (en) * | 2019-08-16 | 2019-12-20 | 广州微点焊设备有限公司 | Automatic welding equipment for resistance welding of IC card |
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| SU556915A1 (en) * | 1975-07-17 | 1977-05-05 | Рижский Ордена Трудового Красного Знамени Политехнический Институт | Device for welding insulated wire to metal parts |
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| CN111515507B (en) | 2022-01-21 |
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