KR101734058B1 - Electrode unit for vibration spot welding device - Google Patents

Electrode unit for vibration spot welding device Download PDF

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Publication number
KR101734058B1
KR101734058B1 KR1020150160554A KR20150160554A KR101734058B1 KR 101734058 B1 KR101734058 B1 KR 101734058B1 KR 1020150160554 A KR1020150160554 A KR 1020150160554A KR 20150160554 A KR20150160554 A KR 20150160554A KR 101734058 B1 KR101734058 B1 KR 101734058B1
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KR
South Korea
Prior art keywords
electrode
cap tip
tip
electrode unit
pin
Prior art date
Application number
KR1020150160554A
Other languages
Korean (ko)
Inventor
김태현
이문용
Original Assignee
주식회사 성우하이텍
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Publication date
Application filed by 주식회사 성우하이텍 filed Critical 주식회사 성우하이텍
Priority to KR1020150160554A priority Critical patent/KR101734058B1/en
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Publication of KR101734058B1 publication Critical patent/KR101734058B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/30—Features relating to electrodes
    • 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
    • B23K11/12—Spot welding; Stitch welding making use of vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/001—Interlayers, transition pieces for metallurgical bonding of workpieces
    • B23K35/007—Interlayers, transition pieces for metallurgical bonding of workpieces at least one of the workpieces being of copper or another noble metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires

Abstract

The present invention relates to an electrode unit to weld a vibration spot and, more specifically, relates to an electrode unit to weld a vibration spot capable of forming an electrode and a cap tip in a separate form such that the electrode is easily changeable. To achieve this, the present invention comprises: a shank; a cap tip mounted on a front end portion of the shank; an electrode formed on the front end of the cap tip, directly contacting a welded portion of a material to apply electricity; and an insulating ring surrounding an outer circumferential surface of the electrode, and fixating the electrode to the cap tip through a coupling means.

Description

ELECTRODE UNIT FOR VIBRATION SPOT WELDING DEVICE

TECHNICAL FIELD The present invention relates to an electrode unit for vibration spot welding, and more particularly, to an electrode unit for vibration spot welding that can easily replace an electrode because the electrode and the cap tip are separated from each other.

Generally, there are fusion welding and solid phase welding methods for welding two sheets of overlapping metal sheets.

The spot welding method is a melting welding method. The spot welding method is a method of welding a superimposed metal plate by melting a welded portion by heat and pressure due to electrical resistance to a welded portion of overlapped metal plates.

The solid-state welding method is exemplified by Friction Stir Welding (FSW). In the friction stir welding method, when a non-consumable tool having a thread-like projection is rotated at high speed and inserted into the material to be bonded, The friction material is softened by the frictional heat and the material to be welded is welded on the principle that the materials on both sides of the joint surface are forcibly mixed by the plastic flow of the material due to the pivot of the tool.

The spot welding and the friction stir welding have advantages and disadvantages. For example, spot welding is performed by melting the welded portion of the metal plates by heat generated by electrical resistance, Arc is generated, and the welding surface is not good.

The friction stir welding is a solid-state welding method in which the welded metal plates have excellent mechanical strength and arc is not generated. However, after welding, there is a disadvantage that a welding mark or hole is left on the welding surface due to the rotation of the projection.

In order to solve the disadvantages of such spot welding and friction stir welding, research and development has been conducted in recent years on a vibration spot welding apparatus for joining a metal plate with a cyclic load of simple linear reciprocating motion.

However, in the electrode unit of the conventional vibration spot welding apparatus, since the cap tip is made of chromium copper, current loss occurs when a current supplied from the shank flows, and electrode replacement is not easy when the electrode is broken.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

An embodiment of the present invention provides an electrode unit for vibrating spot welding, in which an electrode and a cap tip are separated from each other, and a grease can be applied between the electrode and the cap tip.

And, the embodiment of the present invention provides an electrode unit for vibration spot welding capable of fixing the insulating ring to the cap tip by the coupling means.

In one embodiment of the present invention, shanks; A cap tip mounted on a distal end of the shank; An electrode disposed at the tip of the cap tip for directly applying a current to the welded portion of the workpiece; And an insulating ring surrounding the outer peripheral surface of the electrode and fixing the electrode to the cap tip through coupling means.

Also, a conductive grease may be applied between the cap tip and the electrode.

The coupling means may include a plurality of fixing pins inserted into the plurality of pin holes formed at regular intervals along the lower circumference of the insulating ring to fix the electrode to the cap tip. A plurality of springs inserted into each of the plurality of pin holes corresponding to an outer side of the fixing pin; And a fixing ring mounted on an outer peripheral surface of the insulating ring to support the spring.

In addition, the pin hole may have a stepped surface for supporting the rear end of the fixing pin to prevent the fixing pin from coming off.

In addition, the cap tip may be formed with a band-shaped insertion groove into which the tip of the fixing pin is inserted along an outer circumferential surface corresponding to the pin hole.

In addition, the electrode may be formed in a truncated cone shape.

In addition, the cap tip and the electrode may be made of copper (Cu) or a copper alloy.

Further, the cap tip can be press-fitted and fixed to the distal end of the shank by interference fit.

In another embodiment of the present invention, a shank; A cap tip mounted on a distal end of the shank; An electrode disposed at the tip of the cap tip for directly applying a current to the welded portion of the workpiece; And an insulating ring surrounding the outer circumferential surface of the electrode and fixing the electrode to the cap tip through a coupling means, wherein the coupling means is inserted into a plurality of pin holes formed at regular intervals along the lower circumference of the insulating ring A plurality of fixing pins for fixing the insulating ring to the cap tip; A spring inserted into the pin hole corresponding to an outer side of the fixing pin; And a fixing ring mounted on an outer circumferential surface of the insulating ring corresponding to the plurality of pin holes to support the spring.

In the embodiment of the present invention, since the electrode and the cap tip are separated from each other, the electrode can be easily replaced, and the electrode and the cap tip are in contact with each other through the grease, so that the contact resistance can be reduced and the thermal conductivity can be increased.

Further, since the insulating ring is fixed to the cap tip by the coupling means of the interference fit type, the insulating ring can be easily detached and attached.

In addition, effects obtainable or predicted by the embodiments of the present invention will be directly or implicitly disclosed in the detailed description of the embodiments of the present invention. That is, various effects to be predicted according to the embodiment of the present invention will be disclosed in the detailed description to be described later.

1 is a perspective view showing a vibration spot welding apparatus including an electrode unit according to an embodiment of the present invention.
2 is a perspective view illustrating an electrode unit according to an embodiment of the present invention.
3 is an exploded perspective view illustrating an electrode unit according to an embodiment of the present invention.
4 is a cross-sectional view illustrating an electrode unit according to an embodiment of the present invention.
5 is an enlarged cross-sectional view of A shown in Fig.
6 is a view for explaining the operation of a vibration spot welding apparatus according to an embodiment of the present invention.

The operation principle of the embodiment of the vibration spot welding electrode unit according to the present invention will be described in detail with reference to the accompanying drawings and description. It should be understood, however, that the drawings and the following detailed description are exemplary and explanatory of various embodiments for effectively illustrating the features of the present invention. Therefore, the present invention should not be limited to the following drawings and descriptions.

In the following description of the present invention, 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. The terms used below are defined in consideration of the functions of the present invention, which may vary depending on the user, intention or custom of the operator. Therefore, the definition should be based on the contents throughout the present invention.

In order to efficiently explain the essential technical features of the present invention, the following embodiments will appropriately modify, integrate, or separate terms to be understood by those skilled in the art to which the present invention belongs , And the present invention is by no means thereby limited.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a vibration spot welding apparatus including an electrode unit according to an embodiment of the present invention.

Referring to FIG. 1, a vibration spot welding apparatus 100 according to an embodiment of the present invention can be applied to a body part assembly process for assembling parts for assembling body parts such as a body panel.

The vibration spot welding apparatus 100 is for integrally superimposing a superimposed material (P: see FIG. 6) in a body part assembling process in order to reduce the weight of the vehicle body panel.

To this end, the vibration spot welding apparatus 100 includes a welding gun 10, an upper electrode unit 50, a lower electrode unit 200, and a vibration generating source 300.

The welding gun 10 is for installing components to be described below and can be mounted on an arm or multi-axial moving device of a welding robot (not shown). The welding gun 10 may include various sub-elements such as brackets, bars, rods, plates, housings, casings, blocks, rails, collars, etc. for supporting the components.

These various subassemblies are for installing the respective components to be described later in the welding gun 10. In the embodiment of the present invention, various subassemblies are collectively referred to as a welding gun 10 except for exceptional cases .

The upper electrode unit 50 applies a current to a welded portion (W: see FIG. 6) of the workpiece P supported by the lower electrode unit 200 to provide heat and pressure due to electrical resistance.

The upper electrode unit 50 is installed on the upper side of the welding gun 10 so as to be movable up and down. That is, the upper electrode unit 50 is a movable electrode and can be vertically movably installed on the welding gun 10 through a driving source such as a motor or an operating cylinder.

The lower electrode unit 200 is a fixed electrode and is fixed to the lower side of the welding gun 10 corresponding to the upper electrode unit 50. The lower electrode unit 200 supports the overlapped material P and can generate resistance heat by applying a current to the welded portion W of the work P.

The lower electrode unit 200 will be described in more detail with reference to FIGS. 2 to 5. FIG.

The vibration generating source 300 is installed in the welding gun 10 to apply vibration to the upper electrode unit 50. The vibration generating source 300 can apply a continuous linear cyclic load to the upper electrode unit 50 by a motor or an operating cylinder.

Since the main structure of the vibration spot welding apparatus 100 configured as above is formed by a known vibration spot welding machine well known in the art, a detailed description of its structure will be omitted in the present specification.

Hereinafter, an example of overlapping the material P in the vertical direction on the lower electrode unit 200 and welding the overlapped material P through the upper electrode unit 50 moving in the vertical direction will be described in detail .

However, the definition of the direction as described above is a relative meaning, and the direction of the reference direction may not be necessarily limited to the reference direction of the embodiment of the present invention, because the direction may vary depending on the reference position of the work P and the welding direction.

FIG. 2 is an exploded perspective view of an electrode unit according to an embodiment of the present invention, FIG. 3 is an exploded perspective view illustrating an electrode unit according to an embodiment of the present invention, FIG. 5 is an enlarged cross-sectional view of A shown in Fig. 4. Fig.

2 through 5, the lower electrode unit 200 includes a shank 210, a cap tip 220, an electrode 230, and an insulator 240.

The shank 210 is installed in the welding gun 10 and supports the cap tip 220, the electrode 230, and the insulator 240. The shank 210 can apply a current to the electrode 230. The transverse section of the shank 210 may be formed in a circular shape.

The cap tip 220 is mounted on the tip of the shank 210. That is, the cap tip 220 is press-fitted to the distal end portion of the shank 210 in a forced fit.

The electrode 230 is configured at the tip of the cap tip 220. The electrode 230 together with the upper electrode unit 50 applies a current to the welded portion W of the material P to generate resistance heat in the welded portion W.

The electrode 230 may be formed in a frustum shape.

A conductive grease 227 may be applied between the cap tip 220 and the electrode. Since the conductive paste 227 is applied in this way, the electrode 230 can be easily separated from the cap tip 220 when the electrode 230 is replaced. Also, since the cap tip 220 and the electrode 230 are in contact with each other through the conductive paste 227, the contact resistance can be reduced and the thermal conductivity can be increased.

The cap tip 220 and the electrode 230 may be made of copper or a copper alloy. For example, the cap tip 220 and the electrode 230 may be made of a copper alloy such as chrome copper, titanium copper, zirconium copper, aluminum brass, tin brass, or the like.

The insulator 240 surrounds the outer circumferential surface of the electrode 230 and fixes the electrode 230 to the cap tip 220 through the coupling means 250. The insulator 240 may be made of a hard anodized steel material P.

The coupling means 250 includes a plurality of fixing pins 260, a plurality of springs 265 and a fixing ring 270 for fixing the electrode 230 to the cap tip 220. The coupling means 250 may secure the electrode 230 to the insulator 240 and the cap tip 220 through interference fit through the fixing pin 260 and the spring 265. [

The fixing pin 260 is inserted into each of the pin holes 245 formed at regular intervals along the lower circumference of the insulator 240 to fix the electrode 230 to the cap tip 220. For example, four fixing pins 260 may be formed as shown in FIG.

At this time, the pin hole 245 may be formed with a stepped surface for supporting the rear end of the fixing pin 260 to prevent the fixing pin 260 from coming off as shown in FIG. The pin holes 245 may be formed to have the same number as the number of the fixing pins 260 so that the fixing pins 260 are inserted. For example, the pinhole 245 may be formed in the same manner as the stationary pin 260.

The tip of the fixing pin 260 is inserted into the insertion groove formed in the cap tip 220 as shown in FIG. At this time, the insertion groove is formed along the outer peripheral surface of the cap tip 220 so as to correspond to the pin hole 245. The insertion groove may be formed in a band shape along the outer peripheral surface of the cap tip 220.

The spring 265 is installed outside the fixing pin 260 and is inserted into each of the plurality of pin holes 245. The spring 265 may be formed in the same number as the fixing pin 260. For example, as shown in FIG. 3, the number of the springs 265 may be four, which is the same as the number of the fixing pins 260.

The stationary ring 270 is mounted on the outer circumferential surface of the insulator 240 to support the spring. The fixing ring 270 may be formed in the same shape as the outer circumferential surface of the insulator 240. For example, the cross-section of the retaining ring 270 may be circular. Also, the fixing ring 270 may be formed in a partially opened shape as shown in FIGS.

Hereinafter, with reference to FIG. 6, a method of welding a work P using a vibration spot welding apparatus according to an embodiment of the present invention will be described.

6 is a view for explaining the operation of a vibration spot welding apparatus according to an embodiment of the present invention.

Referring to FIG. 6, the two sheets P to be joined are superimposed and positioned between the upper electrode unit 50 and the lower electrode unit 200 of the welding gun 10. In this state, the welding gun 10 is moved and supported through the electrode of the lower electrode unit 200 and the insulator 240, the upper electrode unit 50 is lowered through the driving source, and the upper electrode unit 50 And is brought into contact with the material (P).

Thereafter, a current is applied to the workpiece P through the upper electrode unit 50 and the lower electrode unit 200 while the workpiece P is pressed through the upper electrode unit 50, ).

Then, the welded portion W is softened by heating, and vibrates the upper electrode unit 50 through the vibration generating source 300 in a softened state. As a result, the welding portions W are subjected to plastic flow, and the respective materials P are welded while being mixed with each other in the welding portion W by the plastic flow.

As described above, in the electrode unit for vibration spot welding according to the embodiment of the present invention, since the cap tip 220 and the electrode 230 are separated from each other, the electrode 230 can be easily separated and replaced .

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

10: Welding gun
50: upper electrode unit
100: vibration spot welding device
200: Lower electrode unit
210: The shank
220: Cap Tips
230: Electrode
240: Insulation ring
250: coupling means
300: vibration source
P: Material
W: Weld

Claims (13)

Shank;
A cap tip mounted on a distal end of the shank;
An electrode disposed at the tip of the cap tip for directly applying a current to the welded portion of the workpiece;
A conductive paste applied between the cap tip and the electrode; And
An insulating ring surrounding the outer periphery of the electrode and fixing the electrode to the cap tip via coupling means;
≪ / RTI >
The coupling means
A plurality of fixing pins inserted into each of a plurality of pin holes formed at regular intervals along a circumference of the insulating ring to fix the electrode to the cap tip;
A plurality of springs inserted into each of the plurality of pin holes corresponding to an outer side of the fixing pin; And
A retaining ring mounted on an outer circumferential surface of the insulating ring to support the spring;
Lt; / RTI >
Wherein the cap tip has a strip-shaped insertion groove into which the tip of the fixing pin is inserted along an outer circumferential surface corresponding to the pin hole. delete delete The method according to claim 1,
The pin-
Wherein a stepped surface for supporting a rear end of the fixing pin is formed inside the vibration plate for preventing the detachment of the fixing pin. delete The method according to claim 1,
The electrode
An electrode unit for vibration spot welding formed in a truncated cone shape. The method according to claim 1,
Wherein the cap tip and the electrode are made of copper (Cu) or a copper alloy. The method according to claim 1,
The cap tip
And is press-fitted into the tip end portion of the shank by interference fit.
delete delete delete delete delete
KR1020150160554A 2015-11-16 2015-11-16 Electrode unit for vibration spot welding device KR101734058B1 (en)

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Application Number Priority Date Filing Date Title
KR1020150160554A KR101734058B1 (en) 2015-11-16 2015-11-16 Electrode unit for vibration spot welding device

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Application Number Priority Date Filing Date Title
KR1020150160554A KR101734058B1 (en) 2015-11-16 2015-11-16 Electrode unit for vibration spot welding device

Publications (1)

Publication Number Publication Date
KR101734058B1 true KR101734058B1 (en) 2017-05-11

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102059894B1 (en) * 2018-06-21 2019-12-27 대우공업 (주) Structure of eletrode tip for spot welding equipment that minimizes indentation impression

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200413407Y1 (en) * 2006-01-19 2006-04-06 전형익 Connection structure for cable of welding machine
JP2012055936A (en) * 2010-09-09 2012-03-22 Natsume Co Ltd Electrode tip member of resistance welding machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200413407Y1 (en) * 2006-01-19 2006-04-06 전형익 Connection structure for cable of welding machine
JP2012055936A (en) * 2010-09-09 2012-03-22 Natsume Co Ltd Electrode tip member of resistance welding machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102059894B1 (en) * 2018-06-21 2019-12-27 대우공업 (주) Structure of eletrode tip for spot welding equipment that minimizes indentation impression

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