WO2020017690A1

WO2020017690A1 - Induction heating double composite electrode electric resistance spot welding device

Info

Publication number: WO2020017690A1
Application number: PCT/KR2018/010279
Authority: WO
Inventors: 진인태
Original assignee: 부경대학교 산학협력단
Priority date: 2018-07-20
Filing date: 2018-09-04
Publication date: 2020-01-23
Also published as: KR102030774B1

Abstract

The present invention relates to an induction heating double composite electrode electric resistance spot welding device. The induction heating double composite electrode electric resistance spot welding device according to the present invention is an electric resistance spot welding device performing spot welding that comprises an upper spot welding rod and a lower spot welding rod in contact with upper and lower portions of a first metal plate member and a second metal plate member that are superposed between the upper spot welding rod and the lower spot welding rod. The upper spot welding rod and the lower spot welding rod each comprise: a spot welding support rod which has a rod shape and receives a current from a first current supply unit; a spot welding electrode tip which is joined to one end portion of the spot welding support rod; an induction heating electrode tip which has a hole formed to allow the end portion of the spot welding electrode tip to be inserted therein, and is contact with the metal plate members; and an induction heating unit including an induction coil for inductively heating the induction heating electrode tip and the metal plate members by receiving a current from a second current supply unit, wherein the induction coil is located outside the induction heating electrode tip to receive the induction heating electrode tip and is disposed so as to be spaced apart from the induction heating electrode tip and the metal plate members.

Description

Induction Heating Double Composite Electrode Electric Resistance Spot Welding Machine

The present invention relates to an electric resistance spot welder for induction heating double composite electrodes, and more particularly, to induction heating double composite for welding two metal sheets by melting contact surfaces at predetermined positions in a state where metal sheets of different materials are overlapped. An electrode electric resistance spot welder.

Electric resistance spot welding is a technique of melting and welding the contact surfaces of two metal sheets by heat generation by contact resistance at the contact surfaces between the metal sheets by applying a large amount of current using electrodes to a part of two overlapping sheets of metal sheets. This is a relatively tricky technique that requires good control of welding characteristics such as the size, time and pressurization conditions of the welding current depending on the contact surface condition.

The use of nonferrous metals is increasing along with the weight reduction of automobiles, and therefore, spot welding of dissimilar metals between the existing steel sheet and the lightweight metal sheet is necessary. However, in the case of spot welding using a single electrode and a single current, spot welding was difficult due to a difference in physical properties and thicknesses of dissimilar metals. Therefore, by attaching a double-composite electrode tip consisting of a spot welding electrode tip for spot welding and a resistance heating electrode tip for resistance heating to a conventional single spot welding rod, dissimilar metal sheet materials are provided with a difference in heat supply to upper and lower metal plates. We are spot welding.

However, in the case of using a conventional double composite electrode tip, the current supplied is divided into a heating current for supplying a resistance heating electrode tip and a welding current for heating contact resistance between the contact surface of the metal plate and the heating current for heating the metal sheet with resistance heating. Therefore, there is a disadvantage in that the amount of current supplied must be large. Therefore, to solve the above disadvantages and to propose a new type electric resistance spot welder for controlling the difference in heat generation for spot welding between dissimilar metal sheet.

Accordingly, an object of the present invention is to solve such a conventional problem, by forming an induction heating unit for induction heating of the metal sheet by the high frequency current applied to the induction coil on the upper and lower spot welding bars, respectively, to induce the overlapping upper and lower metal sheets. At the same time, the induction heating generated by the induction heating electrode tip is brought into contact with the induction heating electrode tip with respect to the double-composite electrode tip formed of the spot welding electrode tip and the induction heating electrode tip. Induction heating for spot welding of different types of metal sheets by simultaneously using contact resistance heating at the contact surface between the overlapping metal sheets generated by the electric current applied to the spot welding electrode tip and the conductive heating conducted to the metal sheet It is to provide a double composite electrode electric resistance spot welder.

Problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

The above object is, according to the present invention, the first metal plate and the second metal plate overlapping the position between, including the upper spot welding rod and the lower spot welding rod in contact with the upper and lower parts of the metal plate and performing the spot welding The resistance spot welding machine, wherein the upper spot welding rod and the lower spot welding rod are each supplied with a current from a first current supply unit and are formed of a rod welding support rod; A spot welding electrode tip coupled to one end of the spot welding support rod; An induction heating electrode tip having a hole formed at one end of the spot welding electrode tip to move and being inserted in contact with the metal plate; And an outer side of the induction heating electrode tip to receive the induction heating electrode tip, and spaced apart from the induction heating electrode tip and the metal plate, and receiving a current from a second current supply unit. It can be achieved by an induction heating double composite electrode electric resistance spot welder comprising an induction heating unit comprising an induction coil for induction heating of a sheet.

Here, the upper spot welding rod and the lower spot welding rod is connected to the support portion including a coupling portion coupled to the outside of the spot welding support rod and an extension portion extending from the coupling portion to form a space spaced between the spot welding support rod ; A coil spring inserted into a spaced space between the extension portion of the support connecting portion and the spot welding rod; And one end portion may further include an induction heating electrode tip support inserted into the extension portion of the support connecting portion and sliding along the spot welding support rod and pressurized from the coil spring, and the other end coupled with the induction heating electrode tip. .

Here, the induction coil is formed of a cylindrical coil having a shape for receiving the induction heating electrode tip therein and a spiral planar coil extending from an end of the cylindrical coil to gradually increase in diameter on a plane, wherein the cylindrical coil is The induction heating electrode tip may be induction heated and the spiral planar coil may inductively heat the metal sheet.

Here, the current supplied from the first current supply unit to the spot welding support rod is energized through the spot welding electrode tip to the overlapping metal plate material to generate heat between the contact surfaces of the overlapping metal plate material by the contact resistance, and the second Induction heating of the induction heating electrode tip and the metal plate by the current supplied from the current supply to the induction coil, by conducting heat generated in the induction heating electrode tip through the contact surface between the induction heating electrode tip and the metal plate The metal sheet material can be heated.

Here, the spot welding electrode tip is preferably formed of a copper material.

Here, the induction heating electrode tip is preferably formed of a steel material.

Here, the induction coil is preferably formed of a copper material.

Here, the electric resistance spot welder is an upper bed plate for mounting the upper spot welding rod; A lower bed plate for mounting the lower spot welding rod; And it may further comprise a bed plate connecting portion for connecting the upper bed plate and the lower bed plate.

Here, the electric resistance spot welder may further include a transfer unit to press the overlapping metal plate while conveying the upper spot welding rod in the longitudinal direction.

Here, the transfer unit is a sliding plate which is fixed on the other end of the spot welding support rod and sliding on the upper bed plate for mounting the upper spot welding rod; And a driving part fixed to the upper bed plate to transfer the sliding plate back and forth.

The sliding plate may include a first sliding plate sliding on the upper bed plate and a second sliding plate sliding on the first sliding plate.

Here, the electric resistance spot welder is fixed to the sliding plate, the other end portion of the spot welding support rod is formed a hole to be fixed, the upper spot welding rod support portion formed with a terminal connected to the first current supply portion at one end It may further include.

Here, the electric resistance spot welder is fixed to the lower bed plate and the other end of the spot welding support rod is formed is a hole is fixed, the bottom spot welding rod support further comprises a terminal connected to the first current supply is formed You can do it.

Here, the electric resistance spot welder is fixed to the sliding plate and the hole is formed by inserting the middle portion of the spot welding support rod is fixed, the upper auxiliary support portion is formed with two terminals each connected to both ends of the induction coil The second current supply unit may be connected to the two terminals to form a closed circuit.

Here, the electric resistance spot welder is fixed to the lower bed plate and the hole is formed by inserting the middle portion of the spot welding support rod is fixed, the lower auxiliary support portion is formed with two terminals each connected to both ends of the induction coil The second current supply unit may be connected to the two terminals to form a closed circuit.

Here, the second current supply unit may be formed of an upper second current supply unit supplying current to the induction heating unit of the upper spot welding rod and a lower second current supply unit supplying current to the induction heating unit of the lower spot welding rod. .

The above object is, according to the present invention, the first metal plate and the second metal plate overlapping the position between, including the upper spot welding rod and the lower spot welding rod in contact with the upper and lower parts of the metal plate and performing the spot welding In the resistance spot welding machine, the upper spot welding rod and the lower spot welding rod are each receiving a current from a first current supply unit, the spot welding support rod in the form of a rod; A spot welding electrode tip coupled to one end of the spot welding support rod and in contact with the metal plate; An induction heating electrode tip coupled to one end of the spot welding support rod and accommodating the spot welding electrode tip therein, and having a hole into which one end of the spot welding electrode tip is inserted and contacting the metal plate; And an outer side of the induction heating electrode tip to receive the induction heating electrode tip, and spaced apart from the induction heating electrode tip and the metal plate, and receiving a current from a second current supply unit. It can be achieved by an induction heating double composite electrode electric resistance spot welder comprising an induction heating unit comprising an induction coil for induction heating of a sheet.

Here, one end of the spot welding electrode tip may be inserted and fixed to the inner surface of the spot welding support rod.

Here, one end of the induction heating electrode tip may be fixed by extrapolating to the outer surface of the spot welding support rod.

Here, the induction heating portion support portion connecting portion including a coupling portion coupled to the outside of the spot welding support rod and an extension portion extending from the coupling portion to form a space spaced between the spot welding support rod; A coil spring inserted into a spaced space between the extension portion of the support connecting portion and the spot welding rod; And an induction coil guide support having one end inserted into the extension part of the support connecting part and sliding along the spot welding support rod and pressurized from the coil spring, and the other end forming a space for arranging the induction coil. have.

Here, the spot welding electrode tip is preferably formed of a copper material.

Here, the induction coil is preferably formed of a copper material.

The transfer unit is a sliding plate which is fixed to the other end of the spot welding support rod and the sliding plate on the upper bed plate for mounting the upper spot welding rod; And a driving part fixed to the upper bed plate to transfer the sliding plate back and forth.

According to the induction heating double composite electrode electric resistance spot welder of the present invention as described above, there is an advantage that the spot welding can be easily performed on a dissimilar metal sheet.

In addition, by controlling the amount of heat generated by adjusting the difference in induction heating according to the difference in the high frequency current supplied for induction heating to the upper and lower spot welding rods, the difference in the electrode tip material of the upper and lower double electrode tips or the shape of the electrode tip. In addition, spot welding of the dissimilar metal sheet may be controlled to easily perform spot welding on the dissimilar metal sheet.

In addition, induction heating of the induction heating electrode tip by conduction heating through the contact surface between the induction heating electrode tip and the metal plate can heat the welding site intensively, even if the metal plate is a material that is not well induced heating There is also an advantage in that spot welding can be easily performed.

In addition, there is an advantage that the efficiency compared to the current supplied in the case of induction heating compared to the case of conventional heating the electrode tip.

In addition, there is an advantage that can be manufactured by mounting only the induction heating unit to the existing electric resistance spot welder.

1 is a cross-sectional view showing the state of being disposed on both sides of the metal plate of the upper and lower spot welding rod of the induction heating double composite electrode electric resistance spot welding machine according to an embodiment of the present invention.

2 is a perspective view of an induction coil according to an embodiment of the present invention.

3 is a cross-sectional view showing induction heating and conduction heating derived from the induction coil of the induction heating unit of the present invention.

Figure 4 is a perspective view of an electric resistance spot welder of induction heating double composite electrode according to an embodiment of the present invention.

Figure 5 is a flow chart showing the operation of the electric resistance spot welding machine for induction heating double composite electrode according to an embodiment of the present invention.

Figure 6 is a cross-sectional view showing the state arranged on both sides of the metal plate of the upper and lower spot welding rod of the induction heating double composite electrode electric resistance spot welder according to another embodiment of the present invention.

Specific details of the embodiments are included in the detailed description and drawings.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various different forms, and the present embodiments merely make the disclosure of the present invention complete, and those of ordinary skill in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, the present invention will be described with reference to the drawings for describing an induction heating double composite electrode electric resistance spot welder according to embodiments of the present invention.

1 is a cross-sectional view showing the state of being disposed on both sides of the metal plate of the upper and lower spot welding rods of the induction heating double-composite electrode resistance spot welder according to an embodiment of the present invention, Figure 2 according to an embodiment of the present invention Figure 3 is a perspective view of the induction coil, Figure 3 is a cross-sectional view showing the induction heating and conduction heating induced from the induction coil of the induction heating unit of the present invention, Figure 4 is an induction heating double composite electrode electric resistance according to an embodiment of the present invention 5 is a perspective view of a spot welder, and FIG. 5 is a flowchart illustrating an operation of an electric resistance spot welder of an induction heating double composite electrode according to an exemplary embodiment of the present invention.

Induction heating double composite electrode electric resistance spot welder according to an embodiment of the present invention, the first metal plate (10a) and the second metal plate (10b) of the overlapping different materials, respectively, the upper spot welding rod (100a) and the lower spot It is a welding device that performs a spot welding in the contact state between the welding rod (100b).

Spot welding rods (100a, 100b) according to an embodiment of the present invention are spot welding support rods (110a, 110b), spot welding electrode tips (120a, 120b), induction heating electrode tips (130a, 130b) and induction heating unit ( 140a, 140b). For reference, in the reference numeral a may mean a component associated with the upper spot welding rod (100a), b may refer to a component associated with the lower spot welding rod (100b). In addition, the expressions of 'upper' and 'lower' will be omitted, except in cases where the 'upper' and 'lower' should be distinguished from each other.

The configuration of the upper spot welding rod (100a) and the lower spot welding rod (100b) may be the same, will be described below with respect to the upper spot welding rod (100a).

As shown in FIG. 1, the spot welding support rod 110a receives a current from an external first current supply unit 200 in the form of a rod and is coupled to one end of the spot welding support rod 110a as described below. A current flows through the welding electrode tip 120a. Preferably, the spot welding support rod 110a may be formed as a cylindrical rod, but is not limited thereto.

An inside of the spot welding support rod 110a may be a sealed coolant space 112a into which coolant is injected, and the coolant space 112a and the spot welding support rod 110a to inject the coolant into the coolant space 112a. Cooling water injection pipe 114a for connecting the outside may be formed.

Spot welding electrode tip (120a) is coupled to one end of the spot welding support rod (110a), the end of the spot welding electrode tip (120a) at the time of spot welding is moved by a transfer unit to be described later formed on the induction heating electrode tip (130a) The first metal plate 10a can be contacted through the hole 132a. Therefore, the current supplied from the first current supply unit 200 to the spot welding support rod 110a of the upper spot welding rod 100a flows into the metal plate 10 through the spot welding electrode tip 120a and is energized. When the upper spot welding rod (100a) and the lower spot welding rod (100b) is in contact with the overlapping metal plate 10, respectively, through the first current supply unit 200 to supply current to the first current supply unit 200, the upper A closed circuit in which current circulates to the spot welding rod 100a, the superposed metal plate 10, the lower spot welding rod 100b, and the first current supply unit 200 can be configured.

At this time, the spot welding electrode tip (120a) is preferably detachably coupled to the spot welding support rod (110a) so that it can be replaced when necessary. Furthermore, the spot welding support rod 110a and the spot welding electrode tip 120a may be formed of a copper material having a small resistance so that current can flow well.

The induction heating electrode tip 130a is disposed around the spot welding electrode tip 120a to be in contact with the metal plate 10a together with the spot welding electrode tip 120a when spot welding is performed. Together with the tip (120a) is to configure a double composite electrode tip.

Referring to Figure 1 in more detail the arrangement structure of the induction heating electrode tip (130a), the support connecting portion (136a) by the coupling portion 134a, such as screwed to the outside of one end of the spot welding support rod (110a) It can be fixed. The support connecting portion 136a is formed in the coupling portion 134a so as to have a space between the spot welding support rod 110a and an extension portion 135a is formed, the coil spring 137a is formed in the spaced apart space Can be inserted. In addition, one end portion of the induction heating electrode tip support 138a is pressed by the coil spring 137a in a state where one end portion is inserted into the extension portion 135a of the support connection portion 136a, thereby forming an outer surface of the spot welding support rod 110a. It is configured to slide along, and the other end may be coupled to the induction heating electrode tip (130a).

As will be described later, the upper spot welding rod 110a can be moved vertically by the transfer unit. When the upper spot welding rod 110a moves downward, the induction heating electrode tip support 138a is shown in FIG. 1. The induction heating electrode tip 130a detachably coupled to the other end first comes into contact with the first metal plate 10a, and the spot welding electrode tip 120a does not contact the first metal plate 10a. Not in condition. At this time, if the upper spot welding rod (100a) by the transfer unit to further move in the downward direction as shown in Figure 3 the induction heating electrode tip (130a) in contact with the first metal plate (10a) coil spring 137a is compressed and the spot welding support rod 110a moves downward so that the spot welding electrode tip 120a contacts the first metal plate 10a through the hole 132a formed in the induction heating electrode tip 130a. You can do it. Therefore, when performing spot welding, the induction heating electrode tip 130a and the spot welding electrode tip 120a can contact the first metal plate 10a at the same time.

The induction heating unit 140a heats the induction heating electrode tip 130a and the metal plate 10 by induction heating generated by high frequency current flowing in the induction coil 143a. In this case, the induction coil 143a constituting the induction heating unit 140a is located outside the induction heating electrode tip 130a to accommodate the induction heating electrode tip 130a therein. The coil having a constant diameter as shown in the cylindrical is formed to extend from the ends of the cylindrical coil 141a and the cylindrical coil 141a to accommodate the induction heating electrode tip 130a therein to gradually increase in diameter in plane It may be formed in the form of a spiral helical planar coil 142a. At this time, the induction coil 143a is preferably formed of a copper material.

Accordingly, the induction heating electrode tip 130a may be inserted into the cylindrical coil 141a. In this case, the induction coil 143a may include the induction heating electrode tip 130a and the first metal plate 10a. They should be spaced apart from each other. As shown in FIG. 1, a guide part 139a may be formed to extend outwardly from the induction heating electrode tip support 138a, and the guide part 139a may have both ends of the induction coil 143a. The guide is connected to the external terminal 252a, and the induction coil 143a is positioned under the guide part 139a.

As shown in FIG. 2, when a high frequency current is applied by the second current supply unit 210a by the special form of the induction coil 143a including the cylindrical coil 141a and the spiral planar coil 142a, the cylindrical coil 141a is applied. The helical planar coil 142a of the silver induction heating electrode tip 130a can heat the first metal plate 10a by induction heating, respectively.

In this case, the heat generated in the induction heating electrode tip 130a by induction heating may heat the conductive metal plate 10 by the contact between the induction heating electrode tip 130a and the first metal plate 10a. Therefore, the spot adjacent to the spot welding performed by the spot welding electrode tip 120a by the induction heating electrode tip 130a can be heated to a locally high temperature.

Therefore, the induction heating electrode tip (130a) is a steel material that allows a large amount of heat generated by induction heating when a high frequency current flows in the induction coil (143a), and can transfer heat well by conduction by contact with the metal plate (10). It is preferable to form, but is not limited thereto.

In addition, as described above, the spiral flat coil 142a heats the metal plate 10 by induction heating, even when the metal plate 10 is a material that does not generate heat well by induction heating such as aluminum. Since the metal sheet 10 can be heated by conduction heating by the induction heating electrode tip 130a, the induction heating double composite electrode electric resistance spot welder according to the present invention performs spot welding even on a material in which induction heating does not occur well. It can be done easily.

In the present invention, the strength of the high frequency current supplied from the upper second current supply unit 210a and the lower second current supply unit 210b respectively connected to the

induction heating units

140a and 140b of the upper and lower

spot welding rods

100a and 100b, respectively. By adjusting differently, the amount of heat applied to the upper and lower metal plate 10 can be controlled differently, and thus, spot welding is also possible for the heterogeneous metal plate 10.

Furthermore, the contact surface of the induction

heating electrode tips

130a and 130b in which induction heating is generated through the second current supply units 210a and 210b and the metal plate 10 according to the shape of the induction

heating electrode tips

130a and 130b. The spot welding can be easily performed on the heterogeneous metal sheet 10 by adjusting the spot welding property according to the difference in the cross-sectional area of the sheet.

Hereinafter, the configuration of the spot welder according to the present invention will be described in more detail, including a transfer part for moving the upper spot welding rod with reference to FIG. 4.

At least one of the upper spot welding rod (100a) and the lower spot welding rod (100b) in the present invention to move in the longitudinal direction so that the end of the spot welding rods (100a, 100b) can be pressed when in contact with the metal plate 10, In this embodiment, a case where the upper spot welding rod (100a) is moved by the transfer unit will be described by way of example.

The upper spot welding rod (100a) is transportably mounted, including a transfer portion for transferring the upper spot welding rod (100a) on the upper bed plate (220a) is fixed position, the lower portion on the lower bed plate (220b) is fixed position Spot welding rod (100b) is mounted, between the upper bed plate 220a and the lower bed plate (220b) can be formed C-shaped bed plate connecting portion 225 for interconnecting the two bed plates (220a, 220b) have.

A sliding plate 230 slidingly sliding may be formed on the upper bed plate 220a, and the other end of the spot welding support rod 110a of the upper spot welding rod 100a is fixed to the sliding plate 230. As shown in Figure 4, the other end portion of the spot welding support rod (110a) is formed a hole 241 is fixed to the upper spot welding rod support portion coupled to the sliding plate 230 by a fastening member such as a bolt ( 240a may be formed as a separate member to couple the upper spot welding rod 100a to the sliding plate 230.

In this case, a terminal 242a to which the first current supply unit 200 is connected may be formed at one end of the upper spot welding rod support unit 240a to be electrically connected to the external first current supply unit 200. Therefore, the current flowing into the upper spot welding rod support part 240a from the first current supplying part 200 may move to and flow through the spot welding electrode tip 120a formed at the spot welding support rod 110a and the end. In this case, an electric insulation plate (not shown) is formed between the upper spot welding support part 240a and the sliding plate 230 so that a current flowing into the upper spot welding support part 240a from the first current supply part 200 is sliding plate 230. It is preferable to block the flow to) and flow only to the upper spot welding rod (100a).

In this case, the sliding plate 230 may be formed in a form in which a plurality of plates are stacked with the first sliding plate 231 and the second sliding plate 232 as shown. Therefore, as the plurality of plates are formed, the stroke distance of linear reciprocating movement can be increased.

In FIG. 4, the first sliding plate 231 slides on the upper bed plate 220a, and the second sliding plate 232 slides on the first sliding plate 231. It may be a structure in which a number of sliding plates are laminated. In this case, the trapezoidal moving projections 234 and the moving grooves 235 are formed to correspond to each plate so that each plate can move in close contact with each plate.

In addition, the driving unit 260 is mounted to the rear of the upper bed plate 220a to transfer the second sliding plate 232 back and forth. The driving unit 260 may be formed as a hydraulic cylinder to reciprocate the piston constituting the hydraulic cylinder to transfer the second sliding plate 232 coupled to the end of the piston in the longitudinal direction. The driving unit 260 may be formed by other power means known in addition to the pneumatic cylinder as long as it can be combined with the second sliding plate 232 to provide power for linearly reciprocating the second sliding plate 232.

In addition, in front of the second sliding plate 232 is formed a hole 251a for inserting and fixing the intermediate portion of the spot welding support rod 110a, and the upper auxiliary support portion 250a coupled to the sliding plate by a fastening member such as a bolt. ) May be formed as a separate member. Two terminals 252a are formed at positions spaced apart from both ends of the upper auxiliary support part 250a, respectively, and both ends of the induction coil 143a and the external second current supply unit 210a may be connected through the respective terminals 252a. have. Therefore, the current supplied from the second current supply unit 210a flows into one end of the induction coil 143a through the terminal 252a formed at one end of the upper auxiliary support unit 250a and passes through the induction coil 143a. Is a closed circuit flowing back to the second current supply unit 210a through a terminal 252a formed at the other end of the upper auxiliary support part 250a connected to the other end of the induction coil 143a.

In this case, an electrical insulation plate (not shown) is formed between the upper auxiliary support part 250a and the second sliding plate 232 so that the current flowing into the upper auxiliary support part 250a from the second current supply part 210a is sliding plate 230. It is preferable to block the flow to the only flow and to flow only to the induction coil (143a).

The lower spot welding rod (100b) also has the same structure as the above-mentioned upper spot welding rod (100a), but in this embodiment, the lower spot welding rod (100b) is fixed to the position does not move, so the configuration of the transfer portion is omitted compared to the upper There is a difference. Accordingly, the lower spot welding portion 100b may be provided with a lower spot welding rod support portion 240b for fixing the other end of the spot welding support rod 110b of the lower spot welding rod 100b to the lower bed plate 220b. The lower auxiliary support part 250b may be formed to fix the middle part of the support bar 110b to the lower bed plate 220b. The terminals 242b and 252b are formed except that the lower spot welding rod supporter 240b and the lower auxiliary supporter 250b are coupled to the lower bed plate 220b to form the first current supply unit 200 and the second current supply unit. Since the configuration connected to 210b is the same as the above-described upper spot welding rod support part 240a and the upper auxiliary support part 250a, a detailed description thereof will be omitted.

Hereinafter, a welding operation of an induction heating double composite electrode electric resistance spot welder according to an embodiment of the present invention will be described with reference to FIG. 5.

In the present invention, the first metal plate member 10a and the second metal plate member 10b to be welded are preferably formed of heterogeneous metal plate members having different metal materials, but are not necessarily limited thereto. That is, the electric resistance spot welder of the present invention may be used to weld the same type of metal sheet.

First, as shown in (a) of FIG. 5, the metal sheet 10 overlapped on the lower spot welding rod 100b is positioned, and the upper spot welding rod 100a is moved downward by the transfer unit. At this time, only the induction heating electrode tip 130b of the lower spot welding rod 100b comes into contact with the second metal plate 10b, and the spot welding electrode tip 120b is positioned at a position spaced apart from the second metal plate 10b. Done.

Next, the upper spot welding rod 100a is moved downward by the transfer unit so that the induction heating electrode tip 130a of the upper spot welding rod 100a comes into contact with the first metal sheet 10a to pressurize the metal sheet 10. In this case, current is supplied to the

induction coils

143a and 143b of the upper and lower

spot welding rods

100a and 100b through the second current supply units 210a and 210b to heat the overlapping metal plate 10 by induction heating. At this time, by controlling the amount of current supplied to the upper and lower parts from the upper second current supply unit 210a and the lower second current supply unit 210b differently, the amount of induction heating heat in the upper and lower portions can be controlled differently.

As described above with reference to Figure 2 according to the shape of the induction coil 143 peculiar to the present invention, the spiral flat coil 142 induction heating the metal plate 10, the cylindrical coil 141 is induction heating Induction heating of the electrode tip 130.

At this time, the ambient temperature of the welding point can be raised by induction heating from the spiral planar coil 142. In addition, since the induction heating electrode tip 130 disposed to surround the spot welding electrode tip 120 contacts the metal plate 10, heat generated by induction heating can be conducted to the metal plate 10, In addition to the induction heating by the spiral planar coil 142, it is possible to heat the proximal portion of the welding point to a high temperature.

Furthermore, as described above, even if the metal plate 10 is a material that is not well induced, the metal plate 10 may be heated by using heat conducted from the induction heating electrode tip 130. It may be possible to perform welding on the metal sheet 10.

Next, when the upper spot welding rod 100a is lowered by the transfer part, the lower spot welding rod 100b is supported under the metal sheet 10, and thus, the lower spot welding rod 100a is not lowered. As shown in FIG. As the coil springs 137 of the upper and lower spot welding rods 100a are respectively compressed, the upper spot welding support rods 100a and the lower spot welding support rods 100b are moved to the lower and upper portions, respectively. Therefore, the upper and lower spot

welding electrode tips

120a and 120b coupled to one end portions of the spot

welding supporting rods

100a and 100b come into contact with the

metal sheets

10a and 10b.

In such a state, a large amount of current is supplied from the first current supply unit 200 to energize between the upper spot welding electrode tip 120a and the lower spot welding electrode tip 120b, so that the overlap of the metal sheet 10 Heat is generated by contact resistance between the contact surfaces to complete spot welding. At this time, the heat supply by induction heating by the second current supply unit 210 may be made at the same time.

After welding, the current supply by the first current supply unit 200 and the second current supply unit 210 is cut off and the upper spot welding rod 100a is raised by the transfer unit. At this time, the induction heating electrode tips (130a, 130b) of the upper and lower spot welding rods (100a, 100b) as shown in Figure 5 (d) is in contact with the metal sheet 10 coil spring 137 This inflation causes the spot

welding support rods

110a and 110b of the upper and lower

spot welding rods

110a and 110b to retreat, and then the induction heating electrode tip 130a of the upper spot welding rod 100a as shown in FIG. This is separated from the first metal plate 10a.

Hereinafter, an induction heating heterogeneous electrode electric resistance spot welder according to another embodiment of the present invention will be described with reference to FIG. 6.

In the following description, a difference will be described with reference to FIGS. 1 to 5 compared with the contents of the above-described embodiment.

In the above-described embodiment, only the spot welding electrode tip 120 is coupled to one end of the spot welding support rod 110, and the induction heating electrode tip 130 is separately mounted around the spot welding support rod 110. 6, the spot welding electrode tip 120 and the induction heating electrode tip 130 are coupled together at one end of the spot welding support rod 110. As shown in FIG.

At this time, the spot welding electrode tip 120 may be fixed to one end is inserted into the inner surface of the spot welding support rod 110, the induction heating electrode tip 130 receives the spot welding electrode tip 120 therein and spot It may be fixed by extrapolating to the outer surface of the welding support rod (110). Therefore, in the present embodiment, the spot welding electrode tip 120a and the induction heating electrode tip 130a coupled to the end of the spot welding support rod 110a move together when the upper spot welding rod 100a moves linearly by the transfer part. .

The induction heating unit 140 includes the induction coil 143 of the form of FIG. 2 as in the above-described embodiment and may be positioned outside the induction heating electrode tip 130 to accommodate the induction heating electrode tip 130. have.

Induction heating unit 140 may be configured to include a support connecting portion 146, coil spring 147, guide coil guide support 148, and guide coil 143.

The support connecting portion 146 may be fixed to the outer side of one end of the spot welding support rod 110 by screwing, etc. by the coupling portion 144. The support connecting portion 146 is formed with an extension part 145 forming a spaced spaced spaced apart from the spot welding support rod 110 at the coupling portion 144 by a predetermined interval, the coil spring 147 in the spaced space ) Can be inserted. In addition, one end of the guide coil guide support 148 is pressed by the coil spring 147 while being inserted into the extension part 145 of the support connecting portion 146 to slide along the spot welding support rod 110. It is configured, and the other end forms a space for accommodating the induction coil 143 therein. At this time, the shape of the other end portion is formed in the form of a cylindrical rod of two stages of different diameters to accommodate the induction coil 143 of the shape as shown in Figure 2 cylindrical coil 141 and the spiral flat coil 142 So that each can be accommodated.

Therefore, in the above-described embodiment, the induction heating electrode tip 143 and the induction heating part 140 move together and the spot welding electrode tip 120 moves separately, and in this embodiment, the spot welding electrode tip 120 ) And the induction heating electrode tip 130 is moved together and the induction heating unit 140 is different in that the structure is moved separately, the rest of the configuration may be the same.

The scope of the present invention is not limited to the above-described embodiments but may be implemented in various forms of embodiments within the scope of the appended claims. Without departing from the gist of the invention claimed in the claims, it is intended that any person skilled in the art to which the present invention pertains falls within the scope of the claims described herein to various extents which can be modified.

Claims

In the electric resistance spot welding machine for performing a spot welding, wherein the first metal plate and the second metal plate overlapped between each other, and the upper spot welding rod and the lower spot welding rod in contact with the upper and lower portions of the metal sheet;

The upper spot welding rod and the lower spot welding rod are respectively

A spot welding support rod receiving a current from the first current supply unit and having a rod shape;

A spot welding electrode tip coupled to one end of the spot welding support rod;

An induction heating electrode tip having a hole formed at one end of the spot welding electrode tip to move and being inserted in contact with the metal plate; And

Located in the outer side of the induction heating electrode tip to receive the induction heating electrode tip, is disposed spaced apart from the induction heating electrode tip and the metal plate and receives a current from the second current supply unit the induction heating electrode tip and the metal plate Induction heating double composite electrode electric resistance spot welder comprising an induction heating unit comprising an induction coil for induction heating.
The method of claim 1,

The upper spot welding rod and the lower spot welding rod are respectively

A support connecting portion including a coupling part coupled to the outside of the spot welding support rod and an extension part extending from the coupling part to form a space spaced between the spot welding support rod;

A coil spring inserted into a spaced space between the extension portion of the support connecting portion and the spot welding rod; And

One end portion is inserted into the extension portion of the support connecting portion sliding sliding along the spot welding support rod is pressed from the coil spring and the other end induction heating electrode further comprising an induction heating electrode tip support coupled to the induction heating electrode tip Composite electrode electric resistance spot welder.
The method of claim 1,

The induction coil is

The induction heating electrode tip is formed of a cylindrical coil and a spiral planar coil extending from the end of the cylindrical coil is formed to gradually increase in diameter in the planar shape, the cylindrical coil is the induction heating electrode tip Induction heating and the spiral planar coil induction heating double resistance electrode electric resistance spot welder for induction heating the metal plate.
In the electric resistance spot welding machine for performing a spot welding, wherein the first metal plate and the second metal plate overlapped between each other, and the upper spot welding rod and the lower spot welding rod in contact with the upper and lower portions of the metal sheet;

The upper spot welding rod and the lower spot welding rod are respectively

A spot welding support rod receiving a current from the first current supply unit and having a rod shape;

A spot welding electrode tip coupled to one end of the spot welding support rod and in contact with the metal plate;

An induction heating electrode tip coupled to one end of the spot welding support rod and accommodating the spot welding electrode tip therein, and having a hole into which one end of the spot welding electrode tip is inserted and contacting the metal plate; And

Located in the outer side of the induction heating electrode tip to receive the induction heating electrode tip, is disposed spaced apart from the induction heating electrode tip and the metal plate and receives a current from the second current supply unit the induction heating electrode tip and the metal plate Induction heating double composite electrode electric resistance spot welder comprising an induction heating unit comprising an induction coil for induction heating.
The method of claim 4, wherein

One end of the spot welding electrode tip is inserted into the inner surface of the spot welding support rod is fixed induction heating double composite electrode electric resistance spot welder.
The method of claim 4, wherein

One end of the induction heating electrode tip is extrapolated and fixed to the outer surface of the spot welding support rod electric resistance spot welder fixed.
The method of claim 4, wherein

The induction coil is

The induction heating electrode tip is formed of a cylindrical coil and a spiral planar coil extending from the end of the cylindrical coil is formed to gradually increase in diameter in the planar shape, the cylindrical coil is the induction heating electrode tip Induction heating and the spiral planar coil induction heating double resistance electrode electric resistance spot welder for induction heating the metal plate.
The method of claim 4, wherein

The induction heating unit

A support connecting portion including a coupling part coupled to the outside of the spot welding support rod and an extension part extending from the coupling part to form a space spaced between the spot welding support rod;

A coil spring inserted into a spaced space between the extension portion of the support connecting portion and the spot welding rod; And

One end portion is inserted into the extension portion of the support connecting portion slides along the spot welding support rod is pressed from the coil spring and the other end induction heating further comprises a guide coil guide support to form a space for the induction coil is disposed Double composite electrode electric resistance spot welder.
The method according to claim 1 or 4,

The current supplied from the first current supply unit to the spot welding support rod is energized through the spot welding electrode tip to the overlapping metal plate to generate heat between the contact surfaces of the overlapping metal plate by contact resistance,

Induction heating of the induction heating electrode tip and the metal plate by the current supplied to the induction coil from the second current supply, heat generated in the induction heating electrode tip through the contact surface between the induction heating electrode tip and the metal plate Induction heating double composite electrode electric resistance spot welder for heating the metal sheet by conducting.
The method according to claim 1 or 4,

The spot welding electrode tip is an induction heating double composite electrode electric resistance spot welder formed of a copper material.
The method according to claim 1 or 4,

The induction heating electrode tip is an electric resistance spot welder of the induction heating double composite electrode formed of a steel material.
The method according to claim 1 or 4,

The induction coil is an electrical resistance spot welder of the induction heating double composite electrode formed of a copper material.
The method according to claim 1 or 4,

The electric resistance spot welder

An upper bed plate for mounting the upper spot welding rod;

A lower bed plate for mounting the lower spot welding rod; And

Induction heating double resistance electrode electric resistance spot welder further comprising a bed plate connecting portion for connecting the upper bed plate and the lower bed plate.
The method according to claim 1 or 4,

The electric resistance spot welder

Induction heating double composite electrode electric resistance spot welder further comprising a transfer unit for pressing the overlapping metal plate while transferring the upper spot welding rod in the longitudinal direction.
The method of claim 14,

The transfer unit

A sliding plate which is fixed at the other end of the spot welding support rod and slidably moves on the upper bed plate to mount the upper spot welding rod; And

Induction heating double composite electrode electric resistance spot welder comprising a drive unit fixed to the upper bed plate for conveying the sliding plate back and forth.
The method of claim 15,

The sliding plate includes a first sliding plate sliding on the upper bed plate and a second sliding plate sliding on the first sliding plate formed induction heating double electrode electrode resistance spot welder.
The method of claim 15,

The electric resistance spot welder

Induction heating double complex is further fixed to the sliding plate and formed with a hole to which the other end of the spot welding support rod is inserted and fixed, and an upper spot welding rod support portion having a terminal connected to the first current supply portion at one end thereof. Electrode electric resistance spot welder.
The method of claim 13,

The electric resistance spot welder

Induction heating double composite electrode electrical resistance is further fixed to the lower bed plate and the hole is formed by inserting the other end of the spot welding support rod is fixed, the bottom spot welding rod support portion is formed a terminal connected to the first current supply Spot welder.
The method of claim 15,

The electric resistance spot welder

And an upper auxiliary support part fixed to the sliding plate and having a hole in which an intermediate part of the spot welding support rod is inserted and fixed, and having two terminals connected to both ends of the induction coil. Induction heating double composite electrode electrical resistance spot welder is connected to the second current supply to form a closed circuit.
The method of claim 13,

The electric resistance spot welder

And a lower auxiliary support part fixed to the lower bed plate and having a hole in which an intermediate part of the spot welding support rod is inserted and fixed, and two terminals each of which is connected to both ends of the induction coil are formed. Induction heating double composite electrode electrical resistance spot welder is connected to the second current supply to form a closed circuit.
The method according to claim 1 or 4,

The second current supply unit is an induction heating double composite formed of an upper second current supply unit supplying current to the induction heating unit of the upper spot welding rod and a lower second current supply unit supplying current to the induction heating unit of the lower spot welding rod. Electrode electric resistance spot welder.