KR101865483B1 - Apparatus and method for spot welding of dissimilar metal plates - Google Patents

Abstract

The present invention relates to a spot welder and a spot welding method for heterogeneous metal plates, simultaneously applying heat generated by friction and electric resistance. According to the present invention, the spot welder for heterogeneous metal plates comprises: first and second spot welding rods placing first and second metal plates overlapped therebetween, having a hollow longitudinally formed therein, and having first and second spot welding electrodes at one end in contact with the metal plates, respectively; first and second rotational friction rods inserted into the hollow of the first and second spot welding rods, respectively, to be rotated, and having first and second rotating friction plates formed on one end in contact with the metal plate, respectively, to generate frictional heat through rotational contact with the metal plate; and a transfer unit to move either or both of the first and second spot welding rods in a longitudinal direction.

Description

TECHNICAL FIELD [0001] The present invention relates to a spot welder for a dissimilar metal plate material and a spot welding method for a dissimilar metal plate material.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dissimilar metal plate spot welding machine and a dissimilar metal plate material spot welding method and, more particularly, to a dissimilar metal plate material welding method in which two metal plates are welded by melting a contact surface at a predetermined position, A spot welding machine and a spot welding method of a dissimilar metal plate material.

Spot welding is a technique in which electrodes are used for a portion of two superimposed metal plates to melt a contact surface of two metal plates by energizing a large amount of current and generating heat due to the resistance of the contact surfaces. This is a relatively tricky technique in which the welding characteristics such as the size, time, and pressing conditions of the current to be welded must be controlled according to the state of the contact surface.

The use of non-ferrous metals is increasing due to the weight reduction of automobiles, and therefore spot welding of dissimilar metals is required between the steel sheet and the lightweight metal sheet. However, in the case of spot welding by the conventional electric resistance heat, it is difficult to perform spot welding due to the difference of physical properties of the dissimilar metals.

Korean Patent No. 10-1525018

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a method and apparatus for simultaneously welding two sheets of dissimilar metal plates of different metal properties to each other by simultaneously applying heat generated by frictional heat and heat generated by electrical resistance And to provide a spot welder of a dissimilar metal plate material and a spot welding method of a dissimilar metal plate material.

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

According to an aspect of the present invention, there is provided a method of manufacturing a plasma display panel including a first metal plate material and a second metal plate material overlapping each other, A first spot electrode and a second spot electrode each having a second spot welding electrode; And a first rotating friction plate and a second rotating friction plate, which are inserted into the hollows of the first spot welding electrode and the second spot welding rod, respectively, and rotate at one end of the metal plate in contact with the metal plate to generate frictional heat A first rotating friction rod and a second rotating friction rod; And a transfer part for moving at least one of the first spot electrode and the second spot electrode in the longitudinal direction.

Here, the first metal plate and the second metal plate are preferably made of different metal plates.

Here, a first rotating motor for rotating the first rotating friction rod and a second rotating motor for rotating the second rotating friction rod are provided. Further comprising a first support bar for fixing the first spot welding rod and the first rotation motor and a second support bar for fixing the second spot welding rod and the second rotation motor, It is possible to reciprocate sliding movement.

Here, the transfer unit may include a hydraulic cylinder.

In this case, it is possible to further include a support base connection unit for interconnecting the first support base and the second support base, and a plurality of sliding bed base plates may be connected between the first support base and the support base connection unit.

In this case, the sliding bed plates may be slidably coupled with each other in the form of trapezoidal moving projections and trapezoidal moving grooves.

Here, the first spot electrode support member may be formed on the first support member to fix the position of the first spot electrode, and the second spot electrode support member may be formed on the second support member to fix the position of the second spot electrode member. And a second current supply unit for supplying a current to the second spot welding electrode through the second spot welding rod supporter, and a second current supply unit for supplying current to the second spot welding electrode through the first spot welding rod supporter .

Herein, the first spot welding rod and the second spot welding rod may be formed with a closed hollow into which cooling water is injected.

Here, the first spot welding electrode and the second spot welding electrode can be separated and replaced from the first spot electrode and the second spot electrode, respectively.

Here, the first rotating friction plate and the second rotating friction plate may be separated from and replaceable from the first rotating friction rod and the second rotating friction rod, respectively.

According to the present invention, the above-described object of the present invention can be achieved by the use of the above-described dissimilar metal plate spot welding machine, wherein the first spot welding electrode and the first spot welding electrode formed at the ends of the second spot welding electrode, And the second spot welding electrode; Generating and maintaining frictional resistance heat with the surface of the metal plate by pressing and rotating the first and second rotating friction plates; And applying a current through the first spot welding electrode and the second spot welding electrode to generate a contact resistance between the conductive plate and the metal plate, And controlling the melting of the metal to spot-weld the first metal plate and the second metal plate.

Here, it is possible to control the melting of the metal on the contact surface between the metal plates by adjusting the frictional heat according to the rotational speed difference between the first and second rotating friction plates.

Here, the frictional heat according to the depth of friction at the time of pressing due to the difference in thickness between the first rotating friction plate or the second rotating friction plate can be controlled to control the metal melting of the contact surface between the metal plates.

The metal melting of the contact surface between the metal plate materials can be controlled by controlling the resistance heat generation according to the difference in electrical resistance value of the material of the first spot welding electrode or the second spot welding electrode.

Herein, the difference in the contact area between the first spot welding electrode and the first metal plate material and the contact area between the second spot welding electrode and the second metal plate material is controlled to control the metal melting of the contact surface between the metal plate materials There is a number.

According to the dissimilar metal plate spot welding machine of the present invention as described above, a spot welding electrode having a hollow therein is used, and a rotating friction plate is inserted therein, and the metal plate is heated by the friction resistance heat by the rotation of the rotating friction plate, There is an advantage that a metal plate can be easily spot-welded by resistance heating generated in the electrode by applying a large amount of current to the spot welding electrode.

Further, it is possible to control the frictional heat of the dissimilar metal plate by controlling the rotational speed of the rotating friction plate, thereby controlling the amount of heat required for spot welding with respect to the dissimilar metal plate.

Further, it is possible to control the frictional heat by controlling the thickness of the rotating friction plate and adjusting the depth of friction at the time of pressing, thereby controlling the amount of heat required for spot welding with respect to different types of metal plates.

In addition, it is possible to replace the spot welding electrode so that the contact area with the material of the spot welding electrode or the contact area with the metal plate can be changed, and the amount of heat required for spot welding can be controlled with respect to different types of metal plate by controlling the amount of heat generated by resistance heating. There is also.

1 is a perspective view of a dissimilar metal plate spot welder according to an embodiment of the present invention.
2 is a cross-sectional view showing a spot welding rod into which a rotating friction rod is inserted.
3 is a plan view of a first spot electrode including a first support that is moved by a pneumo-hydraulic cylinder;
4 is an exploded perspective view illustrating a plurality of stacked sliding bed plates.
5 is a view showing a spot welder of a dissimilar metal plate according to an embodiment of the present invention mounted on a spot welding robot.
6 is a view showing a procedure of spot welding using a dissimilar metal plate spot welder according to an embodiment of the present invention.
FIG. 7 is a reference view for explaining a process of performing spot welding using a dissimilar metal plate spot welder of the present invention.

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

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings for explaining a dissimilar metal plate material spot welding machine and a dissimilar metal plate material spot welding method according to embodiments of the present invention.

FIG. 1 is a perspective view of a dissimilar metal plate spot welding machine according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a spot welding rod into which a rotating friction rod is inserted, FIG. 3 includes a first support moving by a hydraulic cylinder FIG. 4 is a perspective view illustrating a plurality of stacked sliding bed plates, FIG. 5 is a cross-sectional view of a spot welder according to an embodiment of the present invention mounted on a spot welding robot, FIG.

A dissimilar metal plate spot welder according to an embodiment of the present invention includes a first spot welding rod 20a and a second spot welding rod 20b, a first rotating friction rod 23a and a second rotating friction rod 23b, And the like.

At least one of the first spot welding electrode 20a and the second spot welding electrode 20b is formed to have a length of at least one of the lengths of the first spot electrode 20a and the second spot electrode 20b such that the metal plate materials 100a and 100b superposed between the first spot electrode 20a and the second spot electrode 20b are positioned. Direction. In the present embodiment, a case where the first spot electrode 20a moves to the transfer unit will be described as an example.

The first spot welding rod 20a having a cylindrical bar shape is fixed by a first spot welding rod supporter 25a surrounding and fixing the outer circumferential surface on a first support rod 35a to be described later, A hollow is formed in the longitudinal direction. A first rotating friction rod 23a described later can be inserted into the hollow.

In addition, as shown in FIG. 2, a first spot welding electrode 21a may be replaceably formed at one end of the first spot welding electrode 20a. The first spot welding electrode 21a applies a large amount of current in a state of being in contact with one surface of the overlapped dissimilar metal plate member 100a to melt the metal plate members 100a and 100b by resistance heating generated in the electrode, .

Further, a cooling water space 22a may be formed in a closed hollow form between the cylindrical inner wall and the cylindrical outer wall of the first spot electrode rod 20a.

The first rotating bar 23a is inserted into the hollow in the longitudinal direction of the first spot electrode 20a and can rotate inside. A first rotating friction plate 24a may be formed at one end of the first rotating friction bar 23a to generate frictional heat by rotating with the metal plate 100a. At this time, the first rotary friction plate 24a may be formed of a special steel material having high heat resistance, and is a replaceable component separated from the first rotary friction rod 23a.

A first rotary motor 30a for rotating the first rotary friction bar 23a may be formed in a straight line at the other end of the first rotary bar 23a.

As described above, the first spot welding rod 20a is fixed to the first support rod 35a using the first spot welding rod support 25a, and the first rotation motor 30a is fixed. The first support arm 35a is connected to the first support arm 35a by a transferring unit and linearly reciprocates. The first support arm 35a is fixed to the first support arm 35a by linear reciprocation of the first support arm 35a. The first rotating friction rod 23a can be reciprocated linearly together. 1 and 3, a first current supply part 50a formed of a laminated current supply plate is formed on the first spot electrode support base 25a, and the first current supply part 50a is formed on the first support electrode 35a So that the current can be supplied even during the linear reciprocating movement of the wire. The current supplied from the first current supply unit 50a can be supplied to the first spot welding electrode 21a through the first spot electrode support 25a and the first spot electrode 20a.

At this time, a pneumatic / hydraulic cylinder 40 is formed at the rear end of the first support 35a, and the first support 35a can be linearly reciprocated by the reciprocating movement of the piston of the pneumatic / hydraulic cylinder 40, The structure for linearly reciprocating the movable member 35a is not limited to this.

The first spot is formed on the first metal plate 100a side of the overlapped first metal plate 100a and the second metal plate 100b to contact the first metal plate 100a to perform spot welding, The first spot welding electrode 20a, the first spot welding electrode 21a, the first rotating friction bar 23a, the first rotating friction plate 24a, the first rotating motor 30a, the first supporting table 35a, The structure and role of the support 25a and the first current supply part 50a are the same as those of the second spot electrode 100b formed on the side of the second metal plate 100b to perform the spot welding in contact with the second metal plate 100b The second spot welding electrode 21b, the second rotary friction bar 23b, the second rotary friction plate 24b, the second rotary motor 30b, the second support base 35b, the second spot welding rod support 25b, and the second current supply unit 50b, detailed description thereof will be omitted.

However, as described above, the first support base 35a is linearly reciprocated by the pneumatic / hydraulic cylinder 40, but the second support base 35b can be fixed in position.

 The first and second support rods 35a and 35b may be formed with C-shaped support rods 45 connected to each other. At this time, the position of the second support base 35b located at one end of the support base connection unit 45 is fixed, while the first support base 35a located at the other end of the support base connection unit 45 is fixed in the form of a sliding bed plate So that the first support base 35a can be moved with respect to the support base connection portion 45 according to the operation of the pneumo-hydraulic cylinder 40 as described above.

As shown in FIG. 4, the sliding bed plate may be formed of a plurality of plates 35a, 36 and 37, and between the plates 35a, 36 and 37, a moving projection 38 in the form of a trapezoid, The grooves 39 are formed so as to correspond to each other so that the plates 35a, 36 and 37 can be moved in close contact with each other and are formed by a plurality of plates 35a, 36 and 37, .

5 shows a spot welder of a different metal plate according to an embodiment of the present invention mounted on a spot welding robot 200. Fig.

Hereinafter, a method of spot welding a dissimilar metal plate material and a welding process according to an embodiment of the present invention will be described with reference to FIG.

FIG. 6 is a view showing a procedure of spot welding using a dissimilar metal plate spot welding machine according to an embodiment of the present invention, and FIG. 7 is a view showing a process of performing spot welding using a dissimilar metal plate spot welding machine of the present invention FIG.

First, in the present invention, the first metal plate material 100a and the second metal plate material 200b_ may be respectively formed of dissimilar metal plates 100a and 100b having different metal materials.

The first metal plate members 100a and 100b are stacked as shown in Fig. 6 and then the first metal plate members 35a are moved to the pneumo-hydraulic cylinder 40 so that the metal plates 100a and 100b The end portions of the spot welding electrodes 21a and 21b, into which the rotary friction plates 24a and 24b are inserted, respectively, are brought into contact with each other.

Next, the frictional resistance between the rotating friction plates 24a and 24b and the metal plates 100a and 100b due to rotation in a pressurized state is obtained by rotating the rotating friction plates 24a and 24b by operating both the rotating motors 30a and 30b, The contact surfaces with the rotating friction plates 24a and 24b can be heated.

Next, a large amount of current is supplied from the current supply portions 50a, 50b to the spot welding electrodes 21a, 21b while the respective metal plates 100a, 100b are heated by the frictional resistance of the rotating friction plates 24a, 21b, the resistance heat generated by the spot welding electrodes 21a, 21b acts as a synergistic effect, so that spot welding can be performed.

At this time, in the present invention, the rotation speeds of the first rotation friction plate 24a and the second rotation friction plate 24b can be controlled by controlling the rotation speeds of the first rotation motor 30a and the second rotation motor 30b. Therefore, the speeds of the rotating friction plates 24a and 24b can be controlled differently, so that the amount of heat required for spot welding can be adjusted for different types of metal plates 100a and 100b, respectively.

As shown in the enlarged view of FIG. 2, the end portions of the rotating friction plates 24a and 24b protrude finely as compared with the spot welding electrodes 21a and 21b. This is because the rotational friction plates 24a and 24b Is an element for controlling the frictional force according to the depth of friction when pressing and contacting the metal plate members 100a and 100b. Therefore, in the present invention, by controlling the thickness of the rotary friction plates 24a and 24b that are replaceably mounted on the ends of the rotary friction rods 23a and 23b, the frictional resistance heat is controlled according to the depth of friction of the rotary friction plates 24a and 24b So that the amount of heat required for spot welding can be adjusted differently for the different metal plates 100a and 100b.

In the present invention, since the spot welding electrodes 21a and 21b formed at one end of the spot welding electrodes 20a and 20b can be replaced with each other, the kind of material of the spot welding electrodes 21a and 21b, The amount of resistance heat generated through the spot welding electrodes 21a and 21b can be controlled by controlling the contact areas of the metal plates 100a and 100b according to the shapes of the metal plates 100a and 100b, The amount of heat generation required for spot welding can be adjusted to be different from each other.

The process of performing spot welding according to the present invention will be described in more detail with reference to FIG. The frictional heat generated by the rotation of the rotary friction plates 24a and 24b on the frictional contact surfaces 110a and 110b, which are the contact surfaces between the rotational friction plates 24a and 24b and the metal plates 100a and 100b, The current supplied through the first spot welding electrode 21a and the second spot welding electrode 21b is applied to the first spot welding electrode 21a and the second spot welding electrode 21b by the current supplied through the first spot welding electrode 21a and the second spot welding electrode 21b, The electrical resistance heat generated in the two spot welding electrodes 21b is conducted to the metal plate material 100a overlapped with each other through the spot welding electrode contact surfaces 120a and 120b to further heat the overlapping plate material contact surface 90. [

Next, a current flowing through the first spot welding electrode 21a passes through the first metal plate 100a, passes through the overlapping plate contact surface 90, passes through the second metal plate 100b, passes through the second spot welding electrode 21a The current flowing through the second metal plate member 100b passes through the overlapping plate contact surface 90 and passes through the first metal plate member 100a to generate additional heat due to the contact resistance of the overlapping plate contact surface 90. [

Therefore, the overlapping plate contact surfaces 90 of the dissimilar metal plates 100a and 100b are melted by the generation of heat in the three kinds of contact surfaces 90, 110a, 110b, 120a and 120b, thereby completing the spot welding .

In the present invention, in order to control the melting of the overlapping plate material contact surface 90, the frictional heat generated by the rotation friction plates 24a and 24b is transferred to the overlapping plate material contact surface 90 to heat the spot welding electrodes 21a and 21b The electric resistance values of the rotational friction plates 24a and 24b, the friction depths 130a and 130b of the rotating friction plate and the materials of the spot welding electrodes 21a and 21b, as described above, And the spot welding electrodes 21a and 21b can be heated to different temperatures depending on the respective characteristics of the overlapped dissimilar metal plates 100a and 100b according to the contact area of the spot welding electrodes 21a and 21b with the metal plates 100a and 100b.

The scope of the present invention is not limited to the above-described embodiments, but may be embodied in various forms of embodiments within the scope of the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

20a: first spot electrode 20b: second spot electrode
21a: first spot welding electrode 21b: second spot welding electrode
22a: Cooling water space 22b: Cooling water space
23a: first rotating friction rod 23b: second rotating friction rod
24a: first rotating friction plate 24b: second rotating friction plate
25a: first spot electrode support base 25b: second spot electrode support base
30a: first rotating motor 30b: second rotating motor
35a: first support bar 35b: second support bar
40: Pneumo-hydraulic cylinder 50a: First current supply part
50b: second current supply 90: overlapping plate contact surface
100a: first metal plate member 100b: second metal plate member
110a: first rotating friction plate contacting surface 110b: second rotating friction plate contacting surface
120a: first spot welding electrode contact surface 120b: second spot welding electrode contact surface
130a: First rotational friction plate friction depth 130b: Second rotational friction plate friction depth

Claims (15)

And a first spot welding electrode and a second spot welding electrode are formed on one end of the first metal plate material and the second metal plate material that are overlapped between the first metal plate material and the second metal plate material, A first spot electrode and a second spot electrode;
A first current supply unit for supplying a current to the first spot welding electrode; a second current supply unit for supplying a current to the second spot welding electrode;
And a first rotating friction plate and a second rotating friction plate, which are inserted into the hollows of the first spot welding electrode and the second spot welding rod, respectively, and rotate at one end of the metal plate in contact with the metal plate to generate frictional heat A first rotating friction rod and a second rotating friction rod; And
And a transporting unit for moving at least one of the first spot electrode and the second spot electrode in the longitudinal direction,
A frictional resistance heat generated from a contact surface between the first and second friction plates and the metal plate by pressing and rotating the first and second friction plates,
And the second spot welding electrode and the second spot welding electrode through the first current supply unit and the second current supply unit, respectively, and the first spot welding electrode and the second spot welding electrode are formed by applying a current to the first spot welding electrode and the second spot welding electrode, An electrical resistance line that is conducted to the metal plate through a contact surface with the plate,
Wherein the first metal plate and the second metal plate are electrically connected to each other through a contact resistance heat generated on a contact surface between the metal plates by energizing the metal plate by a current energized between the first current supplying part and the second current supplying part, A spot welder of dissimilar metal plate material in which melting is controlled and spot welded. The method according to claim 1,
Wherein the first metal plate material and the second metal plate material are different metal plate materials. The method according to claim 1,
A first rotating motor for rotating the first rotating friction rod and a second rotating motor for rotating the second rotating friction rod;
Further comprising a first support bar for fixing the first spot welding rod and the first rotation motor, and a second support bar for fixing the second spot welding rod and the second rotation motor,
And the transfer unit reciprocally slides the first support member. The method of claim 3,
Wherein the transfer unit includes a hydraulic cylinder. The method of claim 3,
Further comprising: a support link connecting the first support and the second support to each other,
And a plurality of sliding bed plates are connected between the first support member and the support member connection portion. 6. The method of claim 5,
And the sliding bed plates slide and move in the form of trapezoidal moving projections and trapezoidal moving grooves. The method of claim 3,
Further comprising: a first spot electrode support member formed on the first support member and fixing the position of the first spot electrode member; and a second spot electrode support member formed on the second support member and fixing the position of the second spot electrode member,
Wherein the first current supply unit supplies current to the first spot welding electrode through the first spot welding rod supporter and the second current supply unit supplies current to the second spot welding electrode through the second spot welding rod supporter Welded spot welder. The method according to claim 1,
Wherein the first spot welding rod and the second spot welding rod are formed with closed hollows into which cooling water is injected. The method according to claim 1,
Wherein the first spot welding electrode and the second spot welding electrode are separable and replaceable from the first spot electrode and the second spot electrode, respectively. The method according to claim 1,
Wherein the first rotating friction plate and the second rotating friction plate are separable and replaceable from the first rotating friction bar and the second rotating friction bar, respectively. A method of manufacturing a metal plate welding machine using a spot welder of any one of claims 1 to 10,
Contacting the first spot welding electrode and the first spot welding electrode formed at the ends of the first spot welding electrode and the second spot welding electrode to the overlapped metal plate by the transferring unit;
Generating frictional resistance heat on a contact surface between the first rotating friction plate and the second rotating friction plate and the metal plate by pressing and rotating the first rotating friction plate and the second rotating friction plate and conducting the friction resistance heat to the metal plate; And
A current is applied to the first spot welding electrode and the second spot welding electrode through a first current supply unit that supplies current to the first spot welding electrode and a second current supply unit that supplies current to the second spot welding electrode The conductive heating occurring due to the electrical resistance heat generation of the electrode conducted to the metal plate through the contact surface between the first spot welding electrode and the second spot welding electrode and the metal plate, The second metal plate is electrically energized by a current flowing between the first metal plate and the second metal plate to control the metal melting of the contact surface between the metal plates together with the frictional resistance heat by the contact resistance heat generated at the contact surface between the metal plates, And a step of spot welding the plate material and the second metal plate material. 12. The method of claim 11,
And controlling the melting of the metal on the contact surface between the metal plates by controlling the frictional heat according to the rotational speed difference between the first and second rotational friction plates. 12. The method of claim 11,
And controlling the melting of the metal on the contact surface between the metal plates by adjusting the friction heat according to the depth of friction at the time of pressing due to the difference in thickness between the first rotation friction plate and the second rotation friction plate. 12. The method of claim 11,
Wherein the metal melting of the contact surface between the metal plate materials is controlled by controlling resistance heat generation according to a difference in electric resistance value of the material of the first spot welding electrode or the second spot welding electrode. 12. The method of claim 11,
Welding the first spot welding electrode to the second metal plate member by controlling a difference between a contact area of the first spot welding electrode and a contact area of the second spot welding electrode and a contact area of the second metal plate member, Plate material spot welding method.

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