WO2009025530A2 - Electric resistance welding machine - Google Patents

Electric resistance welding machine Download PDF

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Publication number
WO2009025530A2
WO2009025530A2 PCT/KR2008/004929 KR2008004929W WO2009025530A2 WO 2009025530 A2 WO2009025530 A2 WO 2009025530A2 KR 2008004929 W KR2008004929 W KR 2008004929W WO 2009025530 A2 WO2009025530 A2 WO 2009025530A2
Authority
WO
WIPO (PCT)
Prior art keywords
pressurization
welding
jig
power
unit
Prior art date
Application number
PCT/KR2008/004929
Other languages
French (fr)
Other versions
WO2009025530A3 (en
Inventor
Hyon-Chan Jo
Sang-Chun Lee
Original Assignee
Hyon-Chan Jo
Sang-Chun Lee
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hyon-Chan Jo, Sang-Chun Lee filed Critical Hyon-Chan Jo
Publication of WO2009025530A2 publication Critical patent/WO2009025530A2/en
Publication of WO2009025530A3 publication Critical patent/WO2009025530A3/en

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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
    • B23K11/115—Spot welding by means of two electrodes placed opposite one another on both sides of the welded parts
    • 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
    • B23K11/24—Electric supply or control circuits therefor
    • B23K11/25—Monitoring devices
    • B23K11/252—Monitoring devices using digital means
    • B23K11/253—Monitoring devices using digital means the measured parameter being a displacement or a position
    • 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
    • B23K11/24—Electric supply or control circuits therefor
    • B23K11/25—Monitoring devices
    • B23K11/252—Monitoring devices using digital means
    • B23K11/258—Monitoring devices using digital means the measured parameter being a voltage
    • 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
    • B23K11/3009—Pressure electrodes
    • 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
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/0426—Fixtures for other work
    • B23K37/0435—Clamps
    • B23K37/0443—Jigs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00—Metal working
    • Y10S29/013—Method or apparatus with electric heating

Definitions

  • the present invention relates to an electric resistance welding machine.
  • Welding is a method of directly joining the same kind of metal materials or different kinds of metal materials by applying heat and pressure to the metal materials.
  • welding may be classified as a fusion welding or a pressure welding.
  • the fusion welding is a method of melting two metal materials at parts to be joined by heating to rearrange the atomic coupling between the different two metal materials and then joining the melted parts.
  • the fusion welding includes arc welding, gas welding, and Thermit welding.
  • the pressure welding is a method of applying strong physical pressure to different metal parts to be joined from the outside to join the metal parts.
  • a representative example of the pressure welding is gas pressure welding or forge welding, which is a method of applying pressure to the metal parts and, simultaneously, heating the metal parts. This kind of pressure welding may be referred to as heating pressure welding or high-temperature pressure welding.
  • a material exhibiting high ductility such as aluminum or copper, is generally used for pressure welding. Also, there is known cold pressure welding that is capable of achieving welding only by the application of pressure at room temperature.
  • the precious metal materials When precious metal materials are joined by electric arc welding, one of the universally usable welding methods, the precious metal materials, such as gold or silver, may be thermally damaged due to high temperature and high pressure generated during the electric arc welding, since the precious metal materials are soft and have a low melting point.
  • a welding additive is applied to a contact region while objects to be joined are primarily heated, and the objects are pressurized, while the objects are in contact with each other, toward the applied welding additive.
  • the gas welding method has a problem in that, the surfaces of the precious metal materials discolor, since the precious metal materials are melted at high temperature, and therefore, it is necessary to secondarily process the precious metal materials.
  • the present invention has been made in view of the above problems, and it is an object of the present invention to provide an electric resistance welding machine constructed in a structure in which objects to be welded are located in a jig unit having a pressurization cylinder, such that power is supplied to the jig unit, the objects are melted by resistance heat generated from the contact parts of the objects by the power, and pressure applied to the objects located in the jig unit is controlled by the pres- surization cylinder, thereby uniformly maintaining the pressure applied to the objects and thus improving the joining strength.
  • an electric resistance welding machine including a machine body unit constructed in a structure in which with a footstool is formed at the lower part of a machine body, at the middle of which a welding table, at which welding is carried out, is installed, and transfer wheels to transfer the machine body are formed below the footstool, a welding fixing unit constructed in a structure in which a welding support member having a pressurization shaft fixing part is formed on a welding base, formed at the middle of the welding table of the machine body unit, and a power connection part for power connection is formed at one side of the welding support member, a pressurization unit constructed in a structure in which a pressurization body, supported by a pressurization shaft fixed by the pressurization shaft fixing part, is formed above the welding fixing unit, a pressurization cylinder is formed at one side of the pressurization body, a pressurization fixing member, which is movable by the operation of the pressurization cylinder, is formed below
  • the pressurization unit may be constructed in a structure in which a pressurization block, which is pressurized by the operation of the pressurization cylinder, is coupled to the pressurization fixing member inside the pressurization body, whereby the pressurization block is pressurized by the operation of the pressurization cylinder, while power is supplied to the pressurization unit, and therefore, the pressurization jib is successively pressurized, with the result that the contact parts are joined to each other, while being pressurized, by joining heat generated by electric resistance at the contact parts.
  • the pressurization unit may be constructed in a structure in which a pres- surization depth measurement member to display the pressurization depth is formed at one side of the top of the pressurization body such that the pressurization depth measurement member is coupled to the pressurization block, whereby it is possible to measure the pressurization depth of the pressurization jig pressurizing a corresponding object located in the stationary jig by the operation of the pressurization cylinder.
  • control unit may be constructed in a structure in which a power supply switch to supply power, the voltage of which is controlled by a voltage control switch to control voltage, is formed at one side of the machine body unit, a voltage display part to display voltage is formed at one side of the power supply switch, and a footstool switch to control power is formed at one side of the footstool part of the machine body unit such that the supply of the power is controlled by the footstool switch, while the voltage is controlled, during the supply of the power.
  • the electric resistance welding machine with the above-stated construction according to the present invention is constructed in a structure in which objects to be welded are pressurized by the pressurization cylinder, while the objects are located in the jig unit, power is supplied to the respective jigs, with the result that the objects are fusion joined to each other by heat generated from the contact interface between the objects, and the pressure applied to the objects is controlled by the pressurization cylinder. Consequently, the present invention has the effect of uniformly maintaining the pressure applied to the objects and thus improving the joining strength.
  • the electric resistance welding machine according to the present invention is constructed in a structure in which the welding table is formed at the middle of the machine body unit, and the transfer wheels are mounted at the bottom of the machine body unit. Consequently, the present invention has the effect of improving the convenience of transfer and improving the convenience of work through the provision of a working table at which the work is easily performed.
  • the electric resistance welding machine is constructed in a structure in which the welding base, at which the welding support member having the power connection part is formed, is disposed on the welding table of the machine body unit, the stationary jig fixing member, to which the stationary jig, in which a corresponding object to be welded is located, is fastened by the stationary jig fastening member, is fixed to the welding support member, such that power from the power connection part is applied to the stationary jig, in which the corresponding object is located, and when the pressurization cylinder is operated while another cor- responding object to be welded is located in the pressurization jig fastened to the pres- surization jig fixing member, which is connected to the pressurization power supply part to apply power while being pressurized by the pressurization cylinder of the pressurization unit above the welding base, by the pressurization jig fastening member, the pressurization jig and the stationary jig, to which power set by
  • the present invention has the effect of uniformly maintaining the pressure applied to the objects through the achievement of the joining between the objects by the operation of the pressurization cylinder and thus, thereby improving the joining efficiency.
  • the present invention has the effect of not requiring the skillfulness of a worker through the achievement of the joining between the objects by the pressurizing force of the pressurization cylinder, thereby reducing personnel expenses.
  • the electric resistance welding machine is constructed in a structure in which the pressurization jig, in which the corresponding object is located, is coupled to the stationary jig, to which power is applied, by the operation of the pressurization cylinder, the pressure applied to the stationary jig, in which the corresponding object is located, by the pressurization cylinder is maintained, and the objects are fusion joined to each other by resistance heat generated from the power applied to the contact interface between the objects. Consequently, the present invention has the effect of achieving only the fusion joining between the objects, thereby preventing the mixture of any other material and thus preventing the deterioration in quality of precious metals.
  • the electric resistance welding machine is constructed in a structure in which the power is applied to achieve the fusion joining between the objects, while the corresponding object is located in the stationary jig, and the pressurization jig is sequentially pressurized by the pressurization block by the operation of the pressurization cylinder, since the pressurization jig, in which the corresponding object is located, is coupled to the pressurization cylinder via the pressurization block, with the result that the pressurization jig and the stationary jig are primarily pressurized by the operation of the pressurization cylinder, while the power is applied to the pressurization jig and the stationary jig, and therefore, contact heat is generated to melt the objects. Also, the molten objects are successively pressurized, while the pressure applied to the molten objects is increased. Consequently, the present invention has the effect of improving the joining strength at the joined parts of the objects.
  • the electric resistance welding machine is constructed in a structure in which the pressurization depth measurement member is installed at the middle of the pressurization body of the pressurization unit having the pressurization cylinder to pressurize the objects, and therefore, the pressurization is carried out, while the depth pressurized by the operation of the pressurization cylinder is displayed to the outside. Consequently, the present invention has the effect of improving the joining efficiency according to the pressurization through the adjustment of the pressurization depth.
  • the electric resistance welding machine is constructed in a structure in which the control unit, which is connected to the power connection part to supply power to the stationary jig and the pressurization power supply part to supply power to the pressurization jig, such that the corresponding objects can be joined to each other, includes the voltage display part to display joining voltage, the voltage control switch to control voltage to be supplied, and the footstool switch, and the control unit controls the supply of power to the footstool switch while controlling the voltage supplied to the voltage control switch based on the displayed voltage. Consequently, the present invention has the effect of improving the control convenience of power supply. Also, the supply of excessive voltage is interrupted, and therefore, it is possible to prevent the overheating of the objects. Consequently, the present invention has the effect of improving the joining efficiency.
  • the electric resistance welding machine is constructed in a structure in which the pressurization jig is pressurized by the pressurization cylinder, while the corresponding objects are located in the stationary jig and the pressurization jig connected to each other such that the stationary jig and the pressurization jig are electrically conducted by the power applied from the control unit, with the result that the objects are melted by resistance heat generated from the contact parts of the objects and then joined to each other.
  • the objects are joined to each other by the pushing pressure of the pressurization cylinder while the contact parts of the objects are melted by the applied power. Consequently, the present invention has the effect of improving the joining efficiency.
  • the pushing pressure of the pressurization cylinder is easily adjusted depending upon the kinds of the objects. Consequently, the present invention has the effect of increasing the work efficiency and thus improving the productivity.
  • FIG. 1 is a perspective view illustrating an electric resistance welding machine according to the present invention
  • FIG. 2 is a perspective view illustrating the principal part of the electric resistance welding machine according to the present invention.
  • FIG. 3 is a front view illustrating the electric resistance welding machine according to the present invention.
  • FIG. 4 is a side view illustrating the electric resistance welding machine according to the present invention.
  • FIG. 5 is a constructional view illustrating the use state of the electric resistance welding machine according to the present invention. Best Mode for Carrying Out the Invention
  • FIG. 1 is a perspective view illustrating an electric resistance welding machine according to the present invention
  • FIG. 2 is a perspective view illustrating the principal part of the electric resistance welding machine according to the present invention
  • FIG. 3 is a front view illustrating the electric resistance welding machine according to the present invention
  • FIG. 4 is a side view illustrating the electric resistance welding machine according to the present invention
  • FIG. 5 is a constructional view illustrating the use state of the electric resistance welding machine according to the present invention.
  • the electric resistance welding machine 100 includes a machine body unit 110 having a welding table 112, a welding fixing unit 120 having a welding base 121 formed at the top of the welding table 112 of the machine body unit 110, a pressurization unit 130 having a pres- surization cylinder 132 formed above the welding fixing unit 120, a jig unit 140 including a stationary jig 141 formed at the welding fixing unit 120 to allow an object 1 to be welded to be located therein and a pressurization jib 144 formed at the pressurization unit 130, and a control unit 150 to control the operation of the electric resistance welding machine while supplying power to one side of the machine body unit 110.
  • the machine body unit 110 is constructed in a structure in which with a footstool 113 is formed at the lower part of a machine body 111, at the middle of which the welding table 112, at which welding is carried out, is installed, and transfer wheels 114 to transfer the machine body 111 are formed below the footstool 113.
  • the welding fixing unit 120 is constructed in a structure in which a welding support member 122 having a pressurization shaft fixing part 123 is formed on the welding base 121, formed at the middle of the welding table 112 of the machine body unit 110, and a power connection part 124 for power connection is formed at one side of the welding support member 122.
  • the pressurization unit 130 is constructed in a structure in which a pressurization body 131, supported by a pressurization shaft 133 fixed by the pressurization shaft fixing part 123, is formed above the welding fixing unit 120, the pressurization cylinder 132 is formed at one side of the pressurization body 131, a pressurization fixing member 134, which is movable by the operation of the pressurization cylinder 132, is formed below the pressurization body 131, and a pressurization power supply part 135 for power supply is formed at one side of the pressurization fixing member 134.
  • the pressurization unit 130 may be constructed in a structure in which a pressurization block 136, which is pressurized by the operation of the pressurization cylinder 132, is coupled to the pressurization fixing member 134 inside the pressurization body 131. Consequently, when the pressurization block 136 is pressurized by the operation of the pressurization cylinder 132, while power is supplied to the pressurization unit, the pressurization jib 144 is successively pressurized, with the result that the objects are joined to each other, while being pressurized, by joining heat generated by electric resistance at the contact parts.
  • the pressurization unit 130 may be constructed in a structure in which a pressurization depth measurement member 137 to display the pressurization depth is formed at one side of the top of the pressurization body 131 such that the pressurization depth measurement member 137 is coupled to the pressurization block 136. Consequently, it is possible to measure the pressurization depth of the pressurization jig 144 pressurizing the corresponding object located in the stationary jig 141 by the operation of the pressurization cylinder 132.
  • the jig unit 140 is constructed in a structure in which the welding support member
  • a stationary jig fixing member 142 to which the stationary jig is fastened by a stationary jig fastening member 143
  • a pressurization jig fixing member 145 to which the pressurization jig 144 is fastened by a pressurization jig fastening member 146, is formed at one side of the pressurization fixing member 134 upstream of the coupling position between the stationary jig 141 and the pressurization jig 144.
  • the control unit 150 is constructed in a structure in which, at one side of the machine body unit 110, power is supplied to the power connection part 124 of the welding fixing unit 120, and the power is also supplied to the pressurization power supply part 135 of the jig unit 140, with the result that the power is supplied to parts in contact by the pressurization, and therefore, the contact parts are joined to each other by contact heat.
  • control unit 150 may be constructed in a structure in which a power supply switch 151 to supply power, the voltage of which is controlled by a voltage control switch 152 to control voltage, is formed at one side of the machine body unit 110, a voltage display part 153 to display voltage is formed at one side of the power supply switch 151, and a footstool switch 154 to control power is formed at one side of the footstool part 113 of the machine body unit 110 such that the supply of the power is controlled by the footstool switch 154, while the voltage is controlled, during the supply of the power.
  • a power supply switch 151 to supply power the voltage of which is controlled by a voltage control switch 152 to control voltage
  • a voltage display part 153 to display voltage is formed at one side of the power supply switch 151
  • a footstool switch 154 to control power is formed at one side of the footstool part 113 of the machine body unit 110 such that the supply of the power is controlled by the footstool switch 154, while the voltage is controlled, during the supply of the power.
  • a worker transfers the machine body unit 110 of the electric resistance welding machine using the transfer wheels 114 formed at the bottom of the machine body unit 110. Subsequently, the worker locates an object 1 to be welded in the stationary jig 141 fastened to the stationary jig fixing member 142, which is supported by the welding support member 122 on the welding table 112, by the stationary jig fastening member 143.
  • the worker After the an object 1 is located in the stationary jig 141, the worker connects power to the power connection part 124 formed at one side of the welding fixing unit 120 such that power can be applied to the stationary jig 141 fixed to the welding support member 122 through the welding base 121.
  • the worker While the an object 1 is located in the stationary jig 141, the worker connects the pressurization jig fixing member 145, to which the pressurization jig 144 is fastened by the pressurization jig fastening member 146, to the pressurization fixing member 134 formed below the pressurization body 131 having the pressurization cylinder 132 supported to the welding fixing part 120 by the pressurization shaft 133. Subsequently, the worker locates another object 1 to be welded in the pressurization jig 144.
  • the worker While the another object 1 is located in the pressurization jig 144, the worker connects power to the pressurization power supply part 135 formed at one side of the pressurization fixing member 134, such that the pressurization jig 144 is electrically conducted, and therefore, the power is applied to the pressurization jig 144 through the pressurization jig fixing member 145.
  • the objects 1 While the objects 1 are located in the stationary jig 141 and the pressurization jig
  • the worker supplies power by operating the power supply switch 151 of the control unit 150, and applies the power to the power connection part 124 and the pressurization power supply part 135 while controlling the voltage of the supplied power by operating the voltage control switch 152 and displaying the intensity of the voltage on the voltage display part 153.
  • the worker may control the operation of the electric resistance welding machine by stepping on the footstool switch 154, which is formed, at one side of the footstool part 113, at the lower part of the machine body unit 110, to prevent the occurrence of abnormal operation due to emergency, overvoltage supply, or overheating, thereby reducing a defective product ratio.
  • the pressurization jig 144 is coupled to the stationary jig 141, with the result that the objects 1 are brought into contact with each other.
  • the contact parts are electrically conducted, and resistance heat is generated at the contact parts according to the controlled voltage, with the result that the contact parts start to melt.
  • the worker While the objects 1 are in contact with each other such that the objects are joined to each other by the resistance heat, the worker operates the pressurization cylinder 132 having the pressurization block 136, while measuring the pressurization depth using the pressurization depth measurement member 137 formed at the pressurization body 131, to gradually increase a pressurization force and thus increase the joining strength.
  • the jig unit 140 joins the objects 1 to each other, while the objects 1 are pressurized. Consequently, during joining the objects 1, the objects 1 are fusion joined to each other without the use of any other materials. Furthermore, only the contact parts are melted at a low temperature by electric resistance, and therefore, it is not necessary to secondarily process the objects 1, and the damage to a resultant product is minimized, thereby improving the fusion welding quality. Also, the pressurization is achieved by the operation of the pressurization cylinder 132, and therefore, it is possible to uniformly maintain the pressurization force, thereby improving the joining strength. In addition, the worker performs the joining process through the operation of the pressurization cylinder 132, and therefore, the skillfulness of the worker is not required, thereby reducing personnel expenses and thus improving the productivity.
  • the pressurization cylinder 132 is used as the pressurizing means in this embodiment.
  • the pressurizing means may be implemented by several well-known mechanisms (for example, a pressurizing means using a motor or a pressurizing means that is manually or automatically operable using a gear device, such as a rack and pinion).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Resistance Welding (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

An electric resistance welding machine includes a machine body unit constructed in a structure in which with a footstool is formed at the lower part of a machine body, at the middle of which a welding table, at which welding is carried out, is installed, and transfer wheels to transfer the machine body are formed below the footstool, a welding fixing unit constructed in a structure in which a welding support member having a pressurization shaft fixing part is formed on a welding base, formed at the middle of the welding table of the machine body unit, and a power connection part for power connection is formed at one side of the welding support member, a pressurization unit constructed in a structure in which a pressurization body, supported by a pressurization shaft fixed by the pressurization shaft fixing part, is formed above the welding fixing unit, a pressurization cylinder is formed at one side of the pressurization body, a pressurization fixing member, which is movable by the operation of the pressurization cylinder, is formed below the pressurization body, and a pressurization power supply part for power supply is formed at one side of the pressurization fixing member, a jig unit constructed in a structure in which the welding support member of the welding fixing unit is provided at the front thereof with a stationary jig fixing member, to which the stationary jig is fastened by a stationary jig fastening member, power being supplied to the stationary jig fixing member, and a pressurization jig fixing member, to which the pressurization jig is fastened by a pressurization jig fastening member, is formed at one side of the pressurization fixing member upstream of the coupling position between the stationary jig and the pressurization jig, and a control unit constructed in a structure in which, at one side of the machine body unit, power is supplied to the power connection part of the welding fixing unit, and the power is also supplied to the pressurization power supply part of the jig unit, whereby the power is supplied to parts in contact by the pressurization, and therefore, the contact parts are joined to each other by contact heat. The pressurization unit is constructed in a structure in which a pressurization block, which is pressurized by the operation of the pressurization cylinder, is coupled to the pressurization fixing member inside the pressurization body, whereby the pressurization block is pressurized by the operation of the pressurization cylinder, while power is supplied to the pressurization unit, and therefore, the pressurization jig is successively pressurized, with the result that the contact parts are joined to each other, while being pressurized, by joining heat generated by electric resistance at the contact parts.

Description

Description ELECTRIC RESISTANCE WELDING MACHINE
Technical Field
[1] The present invention relates to an electric resistance welding machine.
Background Art
[2] Welding is a method of directly joining the same kind of metal materials or different kinds of metal materials by applying heat and pressure to the metal materials.
[3] Generally, welding may be classified as a fusion welding or a pressure welding. The fusion welding is a method of melting two metal materials at parts to be joined by heating to rearrange the atomic coupling between the different two metal materials and then joining the melted parts. The fusion welding includes arc welding, gas welding, and Thermit welding.
[4] The pressure welding is a method of applying strong physical pressure to different metal parts to be joined from the outside to join the metal parts. A representative example of the pressure welding is gas pressure welding or forge welding, which is a method of applying pressure to the metal parts and, simultaneously, heating the metal parts. This kind of pressure welding may be referred to as heating pressure welding or high-temperature pressure welding.
[5] A material exhibiting high ductility, such as aluminum or copper, is generally used for pressure welding. Also, there is known cold pressure welding that is capable of achieving welding only by the application of pressure at room temperature.
[6] When precious metal materials are joined by electric arc welding, one of the universally usable welding methods, the precious metal materials, such as gold or silver, may be thermally damaged due to high temperature and high pressure generated during the electric arc welding, since the precious metal materials are soft and have a low melting point.
[7] When precious metal materials are joined by soldering, a welding additive is applied to a contact region while objects to be joined are primarily heated, and the objects are pressurized, while the objects are in contact with each other, toward the applied welding additive.
[8] However, when a worker pressurizes the objects with a force greater than the joining force, the welding additive leaks outward from the contact region between the objects, with the result that it is necessary for the worker to remove the leaked welding additive after joining the objects, i.e., it is necessary to secondarily process the objects.
[9] On the other hand, when a worker pressurizes the objects with a force less than the joining force, the objects are not securely fixed to each other at the contact region, and a gap is formed between the joined parts of the objects, with the result that the welded regions are separated from each other.
[10] In addition, when precious metal materials are joined by soldering, a material other than the precious metal materials, e.g., a welding additive, is added to the precious metal materials to be joined, with the result that the value of the precious metal materials may be deteriorated.
[11] On the other hand, when precious metal materials are joined by gas welding using flames, the precious metal materials are fusion joined to each other by the flames. Consequently, it is not necessary to add any material other than the precious metal materials, and therefore, the value of the precious metal materials is not deteriorated. Furthermore, the precious metal materials are joined to each other while the precious metal materials are melted, and therefore, a fixing force at the joined parts of the precious metal materials is improved.
[12] However, the gas welding method has a problem in that, the surfaces of the precious metal materials discolor, since the precious metal materials are melted at high temperature, and therefore, it is necessary to secondarily process the precious metal materials.
[13] Also, it is difficult to handle the flames during the gas welding, and therefore, it is required for a skilled worker to manually perform the welding operation, with the result that the production speed based on welding is lowered, and personnel expenses are raised.
[14] In addition, some of the precious metal materials are destroyed by fire, as the precious metal materials are melted by the flames during the gas welding, with the result that costs related to the process increase.
[15] Therefore, there is a high necessity for a welding machine that is capable of joining the precious metal materials using an electric resistance welding method of electrically conducting objects to be welded, such that electric resistance heat is generated from contact parts of the objects, to melt the objects, and applying an external force to the objects, of which contact parts are melted, to join the objects. Disclosure of Invention Technical Problem
[16] Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide an electric resistance welding machine constructed in a structure in which objects to be welded are located in a jig unit having a pressurization cylinder, such that power is supplied to the jig unit, the objects are melted by resistance heat generated from the contact parts of the objects by the power, and pressure applied to the objects located in the jig unit is controlled by the pres- surization cylinder, thereby uniformly maintaining the pressure applied to the objects and thus improving the joining strength. Technical Solution
[17] In accordance with the present invention, the above and other objects can be accomplished by the provision of an electric resistance welding machine including a machine body unit constructed in a structure in which with a footstool is formed at the lower part of a machine body, at the middle of which a welding table, at which welding is carried out, is installed, and transfer wheels to transfer the machine body are formed below the footstool, a welding fixing unit constructed in a structure in which a welding support member having a pressurization shaft fixing part is formed on a welding base, formed at the middle of the welding table of the machine body unit, and a power connection part for power connection is formed at one side of the welding support member, a pressurization unit constructed in a structure in which a pressurization body, supported by a pressurization shaft fixed by the pressurization shaft fixing part, is formed above the welding fixing unit, a pressurization cylinder is formed at one side of the pressurization body, a pressurization fixing member, which is movable by the operation of the pressurization cylinder, is formed below the pressurization body, and a pressurization power supply part for power supply is formed at one side of the pressurization fixing member, a jig unit constructed in a structure in which the welding support member of the welding fixing unit is provided at the front thereof with a stationary jig fixing member, to which the stationary jig is fastened by a stationary jig fastening member, power being supplied to the stationary jig fixing member, and a pressurization jig fixing member, to which the pressurization jig is fastened by a pressurization jig fastening member, is formed at one side of the pressurization fixing member upstream of the coupling position between the stationary jig and the pressurization jig, and a control unit constructed in a structure in which, at one side of the machine body unit, power is supplied to the power connection part of the welding fixing unit, and the power is also supplied to the pressurization power supply part of the jig unit, whereby the power is supplied to parts in contact by the pressurization, and therefore, the contact parts are joined to each other by contact heat.
[18] Also, the pressurization unit may be constructed in a structure in which a pressurization block, which is pressurized by the operation of the pressurization cylinder, is coupled to the pressurization fixing member inside the pressurization body, whereby the pressurization block is pressurized by the operation of the pressurization cylinder, while power is supplied to the pressurization unit, and therefore, the pressurization jib is successively pressurized, with the result that the contact parts are joined to each other, while being pressurized, by joining heat generated by electric resistance at the contact parts.
[19] Also, the pressurization unit may be constructed in a structure in which a pres- surization depth measurement member to display the pressurization depth is formed at one side of the top of the pressurization body such that the pressurization depth measurement member is coupled to the pressurization block, whereby it is possible to measure the pressurization depth of the pressurization jig pressurizing a corresponding object located in the stationary jig by the operation of the pressurization cylinder.
[20] Also, the control unit may be constructed in a structure in which a power supply switch to supply power, the voltage of which is controlled by a voltage control switch to control voltage, is formed at one side of the machine body unit, a voltage display part to display voltage is formed at one side of the power supply switch, and a footstool switch to control power is formed at one side of the footstool part of the machine body unit such that the supply of the power is controlled by the footstool switch, while the voltage is controlled, during the supply of the power.
Advantageous Effects
[21] The electric resistance welding machine with the above-stated construction according to the present invention is constructed in a structure in which objects to be welded are pressurized by the pressurization cylinder, while the objects are located in the jig unit, power is supplied to the respective jigs, with the result that the objects are fusion joined to each other by heat generated from the contact interface between the objects, and the pressure applied to the objects is controlled by the pressurization cylinder. Consequently, the present invention has the effect of uniformly maintaining the pressure applied to the objects and thus improving the joining strength.
[22] Also, the electric resistance welding machine according to the present invention is constructed in a structure in which the welding table is formed at the middle of the machine body unit, and the transfer wheels are mounted at the bottom of the machine body unit. Consequently, the present invention has the effect of improving the convenience of transfer and improving the convenience of work through the provision of a working table at which the work is easily performed.
[23] Also, the electric resistance welding machine according to the present invention is constructed in a structure in which the welding base, at which the welding support member having the power connection part is formed, is disposed on the welding table of the machine body unit, the stationary jig fixing member, to which the stationary jig, in which a corresponding object to be welded is located, is fastened by the stationary jig fastening member, is fixed to the welding support member, such that power from the power connection part is applied to the stationary jig, in which the corresponding object is located, and when the pressurization cylinder is operated while another cor- responding object to be welded is located in the pressurization jig fastened to the pres- surization jig fixing member, which is connected to the pressurization power supply part to apply power while being pressurized by the pressurization cylinder of the pressurization unit above the welding base, by the pressurization jig fastening member, the pressurization jig and the stationary jig, to which power set by the control unit is applied, are brought into contact with each other, with the result that electric resistance heat is generated at the contact parts of the objects, and therefore, the contact parts of the objects are joined to each other. Consequently, the present invention has the effect of uniformly maintaining the pressure applied to the objects through the achievement of the joining between the objects by the operation of the pressurization cylinder and thus, thereby improving the joining efficiency. In addition, the present invention has the effect of not requiring the skillfulness of a worker through the achievement of the joining between the objects by the pressurizing force of the pressurization cylinder, thereby reducing personnel expenses.
[24] Also, the electric resistance welding machine according to the present invention is constructed in a structure in which the pressurization jig, in which the corresponding object is located, is coupled to the stationary jig, to which power is applied, by the operation of the pressurization cylinder, the pressure applied to the stationary jig, in which the corresponding object is located, by the pressurization cylinder is maintained, and the objects are fusion joined to each other by resistance heat generated from the power applied to the contact interface between the objects. Consequently, the present invention has the effect of achieving only the fusion joining between the objects, thereby preventing the mixture of any other material and thus preventing the deterioration in quality of precious metals.
[25] Also, the electric resistance welding machine according to the present invention is constructed in a structure in which the power is applied to achieve the fusion joining between the objects, while the corresponding object is located in the stationary jig, and the pressurization jig is sequentially pressurized by the pressurization block by the operation of the pressurization cylinder, since the pressurization jig, in which the corresponding object is located, is coupled to the pressurization cylinder via the pressurization block, with the result that the pressurization jig and the stationary jig are primarily pressurized by the operation of the pressurization cylinder, while the power is applied to the pressurization jig and the stationary jig, and therefore, contact heat is generated to melt the objects. Also, the molten objects are successively pressurized, while the pressure applied to the molten objects is increased. Consequently, the present invention has the effect of improving the joining strength at the joined parts of the objects.
[26] Also, the electric resistance welding machine according to the present invention is constructed in a structure in which the pressurization depth measurement member is installed at the middle of the pressurization body of the pressurization unit having the pressurization cylinder to pressurize the objects, and therefore, the pressurization is carried out, while the depth pressurized by the operation of the pressurization cylinder is displayed to the outside. Consequently, the present invention has the effect of improving the joining efficiency according to the pressurization through the adjustment of the pressurization depth.
[27] Also, the electric resistance welding machine according to the present invention is constructed in a structure in which the control unit, which is connected to the power connection part to supply power to the stationary jig and the pressurization power supply part to supply power to the pressurization jig, such that the corresponding objects can be joined to each other, includes the voltage display part to display joining voltage, the voltage control switch to control voltage to be supplied, and the footstool switch, and the control unit controls the supply of power to the footstool switch while controlling the voltage supplied to the voltage control switch based on the displayed voltage. Consequently, the present invention has the effect of improving the control convenience of power supply. Also, the supply of excessive voltage is interrupted, and therefore, it is possible to prevent the overheating of the objects. Consequently, the present invention has the effect of improving the joining efficiency.
[28] Furthermore, the electric resistance welding machine according to the present invention is constructed in a structure in which the pressurization jig is pressurized by the pressurization cylinder, while the corresponding objects are located in the stationary jig and the pressurization jig connected to each other such that the stationary jig and the pressurization jig are electrically conducted by the power applied from the control unit, with the result that the objects are melted by resistance heat generated from the contact parts of the objects and then joined to each other. Also, the objects are joined to each other by the pushing pressure of the pressurization cylinder while the contact parts of the objects are melted by the applied power. Consequently, the present invention has the effect of improving the joining efficiency. In addition, the pushing pressure of the pressurization cylinder is easily adjusted depending upon the kinds of the objects. Consequently, the present invention has the effect of increasing the work efficiency and thus improving the productivity. Brief Description of the Drawings
[29] The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
[30] FIG. 1 is a perspective view illustrating an electric resistance welding machine according to the present invention;
[31] FIG. 2 is a perspective view illustrating the principal part of the electric resistance welding machine according to the present invention;
[32] FIG. 3 is a front view illustrating the electric resistance welding machine according to the present invention;
[33] FIG. 4 is a side view illustrating the electric resistance welding machine according to the present invention; and
[34] FIG. 5 is a constructional view illustrating the use state of the electric resistance welding machine according to the present invention. Best Mode for Carrying Out the Invention
[35] Now, an electric resistance welding machine according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[36] In the drawings, the same or similar elements are denoted by the same reference numerals even though they are depicted in different drawings. In the following, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.
[37] FIG. 1 is a perspective view illustrating an electric resistance welding machine according to the present invention, FIG. 2 is a perspective view illustrating the principal part of the electric resistance welding machine according to the present invention, FIG. 3 is a front view illustrating the electric resistance welding machine according to the present invention, FIG. 4 is a side view illustrating the electric resistance welding machine according to the present invention, and FIG. 5 is a constructional view illustrating the use state of the electric resistance welding machine according to the present invention.
[38] As shown in FIGS. 1 to 5, the electric resistance welding machine 100 according to the present invention includes a machine body unit 110 having a welding table 112, a welding fixing unit 120 having a welding base 121 formed at the top of the welding table 112 of the machine body unit 110, a pressurization unit 130 having a pres- surization cylinder 132 formed above the welding fixing unit 120, a jig unit 140 including a stationary jig 141 formed at the welding fixing unit 120 to allow an object 1 to be welded to be located therein and a pressurization jib 144 formed at the pressurization unit 130, and a control unit 150 to control the operation of the electric resistance welding machine while supplying power to one side of the machine body unit 110.
[39] The machine body unit 110 is constructed in a structure in which with a footstool 113 is formed at the lower part of a machine body 111, at the middle of which the welding table 112, at which welding is carried out, is installed, and transfer wheels 114 to transfer the machine body 111 are formed below the footstool 113.
[40] The welding fixing unit 120 is constructed in a structure in which a welding support member 122 having a pressurization shaft fixing part 123 is formed on the welding base 121, formed at the middle of the welding table 112 of the machine body unit 110, and a power connection part 124 for power connection is formed at one side of the welding support member 122.
[41] The pressurization unit 130 is constructed in a structure in which a pressurization body 131, supported by a pressurization shaft 133 fixed by the pressurization shaft fixing part 123, is formed above the welding fixing unit 120, the pressurization cylinder 132 is formed at one side of the pressurization body 131, a pressurization fixing member 134, which is movable by the operation of the pressurization cylinder 132, is formed below the pressurization body 131, and a pressurization power supply part 135 for power supply is formed at one side of the pressurization fixing member 134.
[42] Here, the pressurization unit 130 may be constructed in a structure in which a pressurization block 136, which is pressurized by the operation of the pressurization cylinder 132, is coupled to the pressurization fixing member 134 inside the pressurization body 131. Consequently, when the pressurization block 136 is pressurized by the operation of the pressurization cylinder 132, while power is supplied to the pressurization unit, the pressurization jib 144 is successively pressurized, with the result that the objects are joined to each other, while being pressurized, by joining heat generated by electric resistance at the contact parts.
[43] Also, the pressurization unit 130 may be constructed in a structure in which a pressurization depth measurement member 137 to display the pressurization depth is formed at one side of the top of the pressurization body 131 such that the pressurization depth measurement member 137 is coupled to the pressurization block 136. Consequently, it is possible to measure the pressurization depth of the pressurization jig 144 pressurizing the corresponding object located in the stationary jig 141 by the operation of the pressurization cylinder 132.
[44] The jig unit 140 is constructed in a structure in which the welding support member
122 of the welding fixing unit 120 is provided at the front thereof with a stationary jig fixing member 142, to which the stationary jig is fastened by a stationary jig fastening member 143, and a pressurization jig fixing member 145, to which the pressurization jig 144 is fastened by a pressurization jig fastening member 146, is formed at one side of the pressurization fixing member 134 upstream of the coupling position between the stationary jig 141 and the pressurization jig 144.
[45] The control unit 150 is constructed in a structure in which, at one side of the machine body unit 110, power is supplied to the power connection part 124 of the welding fixing unit 120, and the power is also supplied to the pressurization power supply part 135 of the jig unit 140, with the result that the power is supplied to parts in contact by the pressurization, and therefore, the contact parts are joined to each other by contact heat.
[46] Here, the control unit 150 may be constructed in a structure in which a power supply switch 151 to supply power, the voltage of which is controlled by a voltage control switch 152 to control voltage, is formed at one side of the machine body unit 110, a voltage display part 153 to display voltage is formed at one side of the power supply switch 151, and a footstool switch 154 to control power is formed at one side of the footstool part 113 of the machine body unit 110 such that the supply of the power is controlled by the footstool switch 154, while the voltage is controlled, during the supply of the power. Mode for the Invention
[47] Hereinafter, the operation of the electric resistance welding machine with the above- stated construction according to the present invention will be described.
[48] First, a worker transfers the machine body unit 110 of the electric resistance welding machine using the transfer wheels 114 formed at the bottom of the machine body unit 110. Subsequently, the worker locates an object 1 to be welded in the stationary jig 141 fastened to the stationary jig fixing member 142, which is supported by the welding support member 122 on the welding table 112, by the stationary jig fastening member 143.
[49] After the an object 1 is located in the stationary jig 141, the worker connects power to the power connection part 124 formed at one side of the welding fixing unit 120 such that power can be applied to the stationary jig 141 fixed to the welding support member 122 through the welding base 121.
[50] While the an object 1 is located in the stationary jig 141, the worker connects the pressurization jig fixing member 145, to which the pressurization jig 144 is fastened by the pressurization jig fastening member 146, to the pressurization fixing member 134 formed below the pressurization body 131 having the pressurization cylinder 132 supported to the welding fixing part 120 by the pressurization shaft 133. Subsequently, the worker locates another object 1 to be welded in the pressurization jig 144.
[51] While the another object 1 is located in the pressurization jig 144, the worker connects power to the pressurization power supply part 135 formed at one side of the pressurization fixing member 134, such that the pressurization jig 144 is electrically conducted, and therefore, the power is applied to the pressurization jig 144 through the pressurization jig fixing member 145. [52] While the objects 1 are located in the stationary jig 141 and the pressurization jig
144, the worker supplies power by operating the power supply switch 151 of the control unit 150, and applies the power to the power connection part 124 and the pressurization power supply part 135 while controlling the voltage of the supplied power by operating the voltage control switch 152 and displaying the intensity of the voltage on the voltage display part 153.
[53] At this time, the worker may control the operation of the electric resistance welding machine by stepping on the footstool switch 154, which is formed, at one side of the footstool part 113, at the lower part of the machine body unit 110, to prevent the occurrence of abnormal operation due to emergency, overvoltage supply, or overheating, thereby reducing a defective product ratio.
[54] When the worker operates the pressurization cylinder 132 while the power is being applied, the pressurization jig 144 is coupled to the stationary jig 141, with the result that the objects 1 are brought into contact with each other. The contact parts are electrically conducted, and resistance heat is generated at the contact parts according to the controlled voltage, with the result that the contact parts start to melt.
[55] While the objects 1 are in contact with each other such that the objects are joined to each other by the resistance heat, the worker operates the pressurization cylinder 132 having the pressurization block 136, while measuring the pressurization depth using the pressurization depth measurement member 137 formed at the pressurization body 131, to gradually increase a pressurization force and thus increase the joining strength.
[56] When the fusion welding is completed, the worker operates the pressurization cylinder 132 to separate the pressurization jig 144 from the stationary jig 141, and draws out the joined objects 1. In this way, the welding is completed.
[57] That is, the worker makes the objects 1 to be electrically conducted, while the objects
1 are fixed to the jig unit 140, and joins the objects 1 to each other, while the objects 1 are pressurized. Consequently, during joining the objects 1, the objects 1 are fusion joined to each other without the use of any other materials. Furthermore, only the contact parts are melted at a low temperature by electric resistance, and therefore, it is not necessary to secondarily process the objects 1, and the damage to a resultant product is minimized, thereby improving the fusion welding quality. Also, the pressurization is achieved by the operation of the pressurization cylinder 132, and therefore, it is possible to uniformly maintain the pressurization force, thereby improving the joining strength. In addition, the worker performs the joining process through the operation of the pressurization cylinder 132, and therefore, the skillfulness of the worker is not required, thereby reducing personnel expenses and thus improving the productivity.
[58] Meanwhile, the pressurization cylinder 132 is used as the pressurizing means in this embodiment. As needed, however, the pressurizing means may be implemented by several well-known mechanisms (for example, a pressurizing means using a motor or a pressurizing means that is manually or automatically operable using a gear device, such as a rack and pinion). [59] Although the preferred embodiment of the present invention has been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Industrial Applicability [60] As apparent from the above description, the electric resistance welding machine with the above- stated construction according to the present invention is widely applicable to a precious metal welding field.

Claims

Claims
[1] An electric resistance welding machine comprising: a machine body unit including a machine body having a welding table at which delding is carried out, a footstool formed at the lower part of a machine body, and transfer wheels formed below the footstool to transfer the machine body; a welding fixing unit including a welding support member having a pres- surization shaft fixing part formed on a welding base, formed at the middle of the welding table of the machine body unit, and a power connection part for power connection formed at one side of the welding support member; a pressurization unit including a pressurization body, supported by a pres- surization shaft fixed by the pressurization shaft fixing part formed above the welding fixing unit, a pressurization cylinder formed at one side of the pressurization body, a pressurization fixing member moving by the operation of the pressurization cylinder below the pressurization body, a pressurization power supply part for power supply formed at one side of the pressurization fixing member, and a pressurization block pressurized by the operation of the pressurization cylinder; a jig unit including a stationary jig fixing member being supplied power by having stationary jig fastened by a stationary jig fastening member formed at the front of the welding support member, and a pressurization jig fixing member having pressurization jig fastened by a pressurization jig fastening member at one side of the pressurization fixing member upstream of the coupling position of the stationary jig ; and a control unit supplying power to the power connection part pressurization power supply part wherein the pressurization block is coupled to the pressurization fixing member and successively pressurizes the pressurization jig when the pressurization cylinder operates by being supplied power.
[2] The electric resistance welding machine according to claim 1, wherein the pressurization unit further includes a pressurization depth measurement member formed at one side of the top of the pressurization body and coupled to the pressurization block to display a pressurization depth.
[3] The electric resistance welding machine according to claim 1, wherein the control unit further includes a power supply switch to supply power, a voltage control switch to control voltage, a voltage display part to display voltage, and a footstool switch to control power formed at one side of the footstool part of the machine body unit.
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Cited By (5)

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Publication number Priority date Publication date Assignee Title
CN103769736A (en) * 2012-10-19 2014-05-07 张欢 Resistance welding machine
CN103769734A (en) * 2012-10-19 2014-05-07 张欢 Resistance welding machine
CN103769735A (en) * 2012-10-19 2014-05-07 张欢 Resistance welding machine
CN103769738A (en) * 2012-10-19 2014-05-07 张欢 Resistance welding machine
CN103769737A (en) * 2012-10-19 2014-05-07 张欢 Resistance welding machine

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KR102302589B1 (en) * 2021-05-17 2021-09-16 아시아기계기술 주식회사 Electric Resistance Welding apparatus

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JP2003205371A (en) * 2002-01-15 2003-07-22 Miyachi Technos Corp Joining device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103769736A (en) * 2012-10-19 2014-05-07 张欢 Resistance welding machine
CN103769734A (en) * 2012-10-19 2014-05-07 张欢 Resistance welding machine
CN103769735A (en) * 2012-10-19 2014-05-07 张欢 Resistance welding machine
CN103769738A (en) * 2012-10-19 2014-05-07 张欢 Resistance welding machine
CN103769737A (en) * 2012-10-19 2014-05-07 张欢 Resistance welding machine

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