KR20220117165A - Cutter for dressing electrode tip and cutter assembly including the same - Google Patents

Abstract

An embodiment of the present invention relates to a cutter for dressing an electrode tip and a cutter assembly including the same, wherein productivity can be improved and production costs can be reduced by maximizing the welding point of an electrode tip capable of maintaining good welding quality after the dressing of the electrode tip. For the purpose, an embodiment of the present invention provides a cutter for dressing an electrode tip and a cutter assembly including the same. The cutter for dressing an electrode tip, which is integrally mounted on a cutter holder rotating according to configuration to perform dressing operation on an electrode tip for spot welding, comprises: a body plate having one side fixed to the cutter holder to be able to be attached and detached; a cutter blade part formed on the other side of the body plate and having the shape of a concave surface, with which a pressurizing surface of the electrode tip comes into contact during dressing operation; and a plurality of pattern protrusions formed on the cutter blade part to protrude and forming a concentric circle pattern on the pressurizing surface of the electrode tip when the body plate is rotated by the rotation of the cutter holder.

Description

CUTTER FOR DRESSING ELECTRODE TIP AND CUTTER ASSEMBLY INCLUDING THE SAME

An embodiment of the present invention is a cutter for electrode tip dressing that can improve productivity and reduce production costs by maximizing the RBI of an electrode tip capable of maintaining good welding quality after dressing of the electrode tip, and a cutter assembly including the same is about

In general, electric resistance welding is a welding method in which an electric current is applied to an object to be welded to make a base material in a molten state with electric resistance heat generated from a contact part, and an external force is applied to join it. Spot welding using an electrode tip is mainly used. have.

In the spot welding, when an electric current is applied while pressing both surfaces of the overlapping metal plates with an electrode tip, a large amount of electrical resistance is generated on the contact surface.

This spot welding method is mainly used for welding panels, etc. in assembly lines such as automobiles and trains by mounting a spot welding machine on an industrial robot.

On the other hand, aluminum alloy has characteristics such as low resistivity (ie, about 6 times compared to steel), high electrical conductivity (ie, about 3.5 times compared to steel), and thermal conductivity (ie, about 6 times compared to steel). High-pressure, short-time and high-current welding conditions are required, and the welding conditions (large heat input) in the high current region and the oxidation layer on the aluminum surface cause electrode deterioration, as well as reduced productivity due to the acceleration of the electrode deterioration. There was a problem in that the welding quality was deteriorated.

Therefore, the shape of the electrode tip is restored and the oxide layer is removed by regularly cutting the pressing portion of the electrode tip using an auto tip dresser during spot welding of an aluminum alloy or the like.

However, when dressing an electrode tip used for spot welding such as conventional aluminum alloy through an auto tip dresser, after performing a maximum of 20 spot welding, that is, 20 times of spot welding after one dressing, the surface of the electrode tip is again deformed or the oxide layer As this occurred, it was necessary to perform the dressing process of the electrode tip through an auto tip dresser again.

In other words, a sticking phenomenon, which is a deadlock state that does not move by being pressed between the aluminum alloy as the welding object, occurs at the point where approximately 20 points are reached after one-time dressing of the electrode tip through the conventional auto tip, resulting in deterioration of welding quality, and further There was a problem causing poor welding.

Therefore, in the prior art, the electrode tip dressing process through the auto tip dresser had to be performed approximately every 20 points, and due to such frequent dressing process cycles, the cycle time of spot welding increases, productivity is reduced, and the electrode tip replacement cycle is fast, so the cost of consumables As this number increases, there is a problem in that the cost required for facility investment increases.

Republic of Korea Patent Publication No. 10-1974590 (2019.04.25.)

An embodiment of the present invention is to provide a cutter for electrode tip dressing capable of maximizing the welding spot of the electrode tip capable of maintaining good welding quality after one-time dressing of the electrode tip, and a cutter assembly including the same.

And, the embodiment of the present invention can improve productivity by reducing the cycle time of spot welding, thereby maximizing the electrode tip replacement cycle to reduce the cost of consumables and reduce the cost of equipment investment. To provide a cutter and a cutter assembly including the same.

According to an embodiment of the present invention, as a cutter for electrode tip dressing that is integrally mounted on a cutter holder that is rotated according to setting and performs a dressing operation on an electrode tip for spot welding, one side is detachable from the cutter holder. possibly fixed body plate; a cutter blade portion formed on the other side of the body plate and having a concave surface contacting the pressing surface of the electrode tip during the dressing operation; and a plurality of protrusions formed on the cutter blade portion to form a concentric circular pattern on the pressing surface of the electrode tip when the body plate is rotated by rotation of the cutter holder. do.

Here, the plurality of pattern protrusions may be formed in a region of the cutter blade portion corresponding to a portion of the pressing surface of the electrode tip that comes into contact with the object to be welded.

At this time, the plurality of pattern projections, the innermost concentric circle of the concentric circle pattern is formed to form a radius of 2 to 4 mm from the center of the pressing surface of the electrode tip, and the outermost concentric circle forms a radius of 10 mm from the center of the pressing surface of the electrode tip. can be

In addition, a through hole is formed in the center of one side of the body plate, and as a fastening member is coupled to the cutter holder through the through hole, the body plate may be fixed to the cutter holder.

Meanwhile, the electrode tip may include an upper electrode tip and a lower electrode tip.

Accordingly, the cutter blade part includes an upper cutter blade part formed on the other upper side of the body plate for dressing the upper electrode tip, and a lower cutter blade part formed on the other side lower part of the body plate for dressing the lower electrode tip. may be included.

According to another embodiment of the present embodiment, the cutter holder is rotated according to the setting, a semi-circular concave seating groove is formed in the center, and a cutter mounting part is formed on one side of the seating groove; and a body plate having one side detachably fixed to the cutter mounting portion of the cutter holder, and a concave-shaped cutter formed on the other side of the body plate to contact the pressing surface of the electrode tip during dressing of the electrode tip for spot welding. A cutter for electrode tip dressing comprising a blade portion and a plurality of protrusions formed on the cutter blade portion to form a concentric circular pattern on the pressing surface of the electrode tip when the body plate is rotated by rotation of the cutter holder; A cutter assembly is provided.

Here, a locking projection may be formed on one side of the body plate, and a locking groove into which the locking projection is inserted may be formed in the cutter mounting portion.

Meanwhile, the electrode tip may include an upper electrode tip and a lower electrode tip.

Accordingly, the seating groove may be formed of upper and lower seating grooves formed to correspond to the upper and lower portions of the cutter holder.

In addition, the cutter blade portion may include an upper cutter blade portion formed on the other upper portion of the body plate to correspond to the upper seating groove for dressing the upper electrode tip, and the other lower portion of the body plate for dressing the lower electrode tip. It may be configured to include a lower cutter blade portion formed to correspond to the lower seating groove.

According to an embodiment of the present invention, there is an advantage in that it is possible to perform efficient welding by maximizing the welding spot of the electrode tip capable of maintaining good welding quality after one-time dressing of the electrode tip, and to minimize welding defects.

In addition, according to an embodiment of the present invention, there is an advantage that productivity can be improved by reducing the cycle time of spot welding.

In addition, according to an embodiment of the present invention, there is an advantage in that the cost of consumables and equipment investment can be reduced by maximizing the electrode tip replacement cycle.

1 is a perspective view schematically showing that a cutter assembly including a cutter according to an embodiment of the present invention is applied to a dressing device
FIG. 2A is a schematic partial perspective view of a dressing of an upper electrode tip of spot welding in FIG. 1; FIG.
FIG. 2B is a perspective view of a main part schematically showing the dressing of the lower electrode tip of the spot welding in FIG. 1; FIG.
3 is an exploded perspective view schematically illustrating an exploded state of a cutter assembly including a cutter in the dresser portion of the dressing apparatus of FIG. 1;
Figure 4 is a perspective view schematically showing a state in which the cutter is mounted on the cutter holder of Figure 3;
5 is a configuration diagram schematically showing a state in which the electrode tip is in contact with the cutter of FIG.
6 is a configuration diagram for explaining a concentric circle pattern formed on the pressing surface of the electrode tip after the dressing process through the cutter of FIG.
7 is a photograph comparing the state of the pressing surface of the electrode tip applied to the present invention with the state of the pressing surface of the conventional electrode tip after about 20 points after dressing

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The following detailed description is provided to provide a comprehensive understanding of the methods, apparatus, and/or systems described herein. However, this is merely an example and the disclosed embodiments are not limited thereto.

In describing the embodiments, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the disclosed embodiments, the detailed description thereof will be omitted. And, the terms to be described later are terms defined in consideration of functions in the disclosed embodiments, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification. The terminology used in the detailed description is for the purpose of describing the embodiments only, and should in no way be limiting. Unless explicitly used otherwise, expressions in the singular include the meaning of the plural. In this description, expressions such as "comprising" or "comprising" are intended to indicate certain features, numbers, steps, acts, elements, some or a combination thereof, and one or more other than those described. It should not be construed to exclude the presence or possibility of other features, numbers, steps, acts, elements, or any part or combination thereof.

1 is a perspective view schematically showing that a cutter assembly including a cutter according to an embodiment of the present invention is applied to a dressing apparatus, FIG. 2a is a perspective view of a major part schematically showing the dressing of the upper electrode tip of the spot welding in FIG. and FIG. 2B is a main partial perspective view schematically illustrating the dressing of the lower electrode tip of the spot welding in FIG. 1 . And, FIG. 3 is an exploded perspective view schematically illustrating an exploded state of a cutter assembly including a cutter in the dresser part of the dressing apparatus of FIG. It is a perspective view, and FIG. 5 is a configuration diagram schematically showing a state in which the electrode tip is in contact with the cutter of FIG. 4, and FIG. 6 is a concentric circle pattern formed on the pressing surface of the electrode tip after the dressing process through the cutter of FIG. It is a configuration diagram for 7 is a photograph comparing the state of the pressing surface of the electrode tip applied to the present invention with the state of the pressing surface of the conventional electrode tip after about 20 points after dressing.

1 to 4, the cutter assembly 100 including the cutter 110 according to an embodiment of the present invention is rotated according to a large setting and the upper electrode tip of the spot welder 10 ( 11) and/or the cutter holder 120 on which the lower electrode tip 12 is seated to form a space for dressing, and the cutter holder 120 integrally mounted on the cutter holder 120 when the cutter holder 120 rotates. The cutter 110 for performing dressing of the pressing surface 11a of the electrode tip 11 and/or the pressing surface 12a of the lower electrode tip 12 may be included.

More specifically, in the cutter holder 120, semicircular concave upper and lower seating grooves 121 and 122 corresponding to each other in the upper and lower portions of the center may be formed, respectively, and the upper and lower seating grooves 121 and 122 may be formed. ) on one side of the cutter mounting portion 123 may be formed.

In addition, the dressing cutter 110 of the electrode tips 11 and 12 has a body plate 111 having one side detachably fixed to the cutter mounting part 123 of the cutter holder 120, and the body plate. Upper and lower cutter blade portions 111a in the form of concave surfaces respectively formed in the upper and lower portions of the other side of 111 to contact the pressing surfaces 11a and 12a of the upper and lower electrode tips 11 and 12 during the dressing operation. , 111b) and the upper and lower cutter blade parts 111a and 111b respectively protrude in plurality, and when the body plate 111 is rotated by the rotation of the cutter holder 120, the upper and lower electrode tips ( 11 and 12 may include upper and lower pattern protrusions 111a-1 and 111b-1 for forming concentric circle patterns on the pressing surfaces 11a and 12a, respectively.

Here, with further reference to FIGS. 5 and 6 , the upper and lower pattern protrusions 111a-1 and 111b-1 are welded objects ( For example, it may be formed in a region of the upper cutter blade part 111a or a region of the lower cutter blade part 111b corresponding to a portion in contact with an aluminum alloy panel for an exterior of an automobile).

At this time, the upper and lower pattern projections 111a-1 and 111b-1 have a radius from the center of the pressing surface 11a or 12a of the electrode tip 11 or 12 corresponding to the innermost concentric circle CC1 among the concentric circle patterns. It is preferable to form 2 to 4 mm and form a radius of 10 mm from the center of the pressing surface 11a or 12a of the electrode tip 11 or 12 corresponding to the outermost concentric circle CC2.

On the other hand, a through hole 111-1 is formed in the center of one side of the body plate 111 so that a fastening member (ex: umbrella head bolt) is connected to the cutter of the cutter holder 120 through the through hole 111-1. As it is coupled to the mounting part 123 , the body blade 111 may be detachably fixed to the cutter holder 120 .

Here, a locking protrusion 111c may be formed on one side of the body plate 111 , and a locking groove 123c corresponding to the locking protrusion 111c may be formed in the cutter mounting part 123 .

Accordingly, the cutter 110 for electrode tip dressing of this embodiment is stable by a fastening member in a state in which the locking protrusion 111c of the body plate 111 is inserted and supported in the locking groove 123c of the cutter mounting part 123 . It can be precisely fixedly coupled as it is fastened to the

Meanwhile, a dog sensor 130 for detecting rotation may be provided at the upper outer portion of the cutter holder 120 .

At this time, fastening holes 130a are respectively formed at both ends of the dog sensor 130 so that a fastening member (ex: wrench head bolt) is attached to the upper outer portion of the cutter holder 120 through the fastening hole 130a. As it is fastened, the dog sensor 130 may be detachably fixed to the cutter holder 120 .

On the other hand, although not shown in detail, when the cutter holder 120 is mounted on the dresser unit 20 of the dressing apparatus, it is connected to a rotation motor built in the dresser unit 20 through a plurality of gears, and the rotational force of the rotation motor can be rotated by receiving

Hereinafter, weldability after the dressing process of the upper and lower electrode tips 11 and 12 of the spot welder 10 through the dressing apparatus including the cutter 110 and the cutter assembly 100 according to an embodiment of the present invention described above Compared with the prior art, it is shown in Tables 1 and 2 below.

At this time, Table 1 is a table showing the results of verifying the weldability after the dressing process of the upper and lower electrode tips through the conventional dressing apparatus, Table 2 is a dressing apparatus including the cutter 110 and the cutter assembly 100 of this embodiment The table shows the results of verifying the weldability after the dressing process of the upper and lower electrode tips through

sequential One 2 3 to 19 20 spot where welding occurs X X X ○ Weldability Verification ○ ○ ○ X

sequential One 2 3 to 119 120 121 122 ~ 195 196 spot where welding occurs X X X X X X X Weldability Verification ○ ○ ○ ○ △ △ △

As shown in Table 1 above, when spot welding is performed using the dressing upper and lower electrode tips after a one-time dressing process of the upper and lower electrode tips through a conventional dressing device, the upper and lower electrode tips are at approximately 20 points As shown in FIG. 7, welding occurred on the pressurized surface due to the generation of an oxide layer, and as a result, there was a problem in that weldability such as poor welding was remarkably deteriorated as a result of weldability verification.

However, as shown in Table 2 above, after one dressing process of the upper and lower electrode tips 11 and 12 through the dressing apparatus including the cutter 110 and the cutter assembly 100 of an embodiment of the present invention, the dressing is When spot welding is performed using the upper and lower electrode tips 11 and 12, welding traces on the pressing surfaces 11a and 12a of the upper and lower electrode tips 11 and 12 as in FIG. 7 up to about 120 points There was no welding at all, and as a result, the welding quality was maintained as in the initial stage without welding defects as a result of the verification of weldability.

Furthermore, when this embodiment is applied, welding did not occur up to 196 points on the pressing surfaces 11a and 12a of the dressing upper and lower electrode tips 11 and 12, but the weldability tends to be somewhat inferior from about 121 points. It was.

As a result, when the dressing of the upper and lower electrode tips 11 and 12 is performed by the cutter 110 and the cutter assembly 100 of this embodiment, at least 10 times more welding than the conventional one, and at least 6 times more than the conventional one. We were able to maintain about twice the welding quality.

Although representative embodiments of the present invention have been described in detail above, those of ordinary skill in the art will understand that various modifications are possible without departing from the scope of the present invention with respect to the above-described embodiments. . Therefore, the scope of the present invention should not be limited to the described embodiments, and should be defined by the claims described below as well as the claims and equivalents.

10: welding machine
11: upper electrode tip
11a: pressing surface of the upper electrode tip
12: lower electrode tip
12a: pressing surface of the lower electrode tip
20 : Dresser
100: cutter assembly
110: cutter
111: body plate
111-1: through hole
111a: upper cutter blade part
111a-1: upper pattern protrusion
111b: lower cutter blade part
111b-1: lower pattern protrusion
111c: locking part
120: cutter holder
121: upper seating groove
122: lower seating groove
123: cutter mounting part
123c: jamming groove
130: dog sensor
130a: fastening hole
CC1 : innermost concentric circle
CC1 : Outermost concentric circle

Claims (8)

A cutter for electrode tip dressing that is integrally mounted on a cutter holder that is rotated according to settings and performs a dressing operation on an electrode tip for spot welding,
a body plate having one side detachably fixed to the cutter holder;
a cutter blade portion formed on the other side of the body plate and having a concave surface contacting the pressing surface of the electrode tip during the dressing operation; and
A cutter for electrode tip dressing comprising; a pattern protrusion formed in a plurality of protrusions on the cutter blade portion to form a concentric circle pattern on the pressing surface of the electrode tip when the body plate is rotated by rotation of the cutter holder.
The method according to claim 1,
The plurality of pattern projections are formed in a region corresponding to a portion in contact with the welding object among the pressing surface of the electrode tip, the electrode tip dressing cutter.
3. The method according to claim 2,
The pattern protrusion,
Of the concentric circle pattern, the innermost concentric circle forms a radius of 2 to 4 mm from the center of the pressing surface of the electrode tip, and the outermost concentric circle is formed to form a radius of 10 mm from the center of the pressing surface of the electrode tip, a cutter for electrode tip dressing.
The method according to claim 1,
A through hole is formed in the center of one side of the body plate so that the body plate is fixed as a fastening member is coupled to the cutter holder through the through hole.
5. The method according to any one of claims 1 to 4,
The electrode tip consists of an upper electrode tip and a lower electrode tip,
The cutter blade portion includes an upper cutter blade portion formed on the other upper portion of the body plate for dressing the upper electrode tip, and a lower cutter blade portion formed on the other lower portion of the body plate for dressing the lower electrode tip. , cutter for electrode tip dressing.
a cutter holder which rotates according to the setting and has a semi-circular concave seating groove formed in the center and a cutter mounting part is formed on one side of the seating groove; and
A body plate having one side detachably fixed to the cutter mounting part of the cutter holder, and a concave-shaped cutter blade part formed on the other side of the body plate to contact the pressing surface of the electrode tip during dressing of the electrode tip for spot welding and a cutter for electrode tip dressing including a plurality of protrusions formed on the cutter blade and pattern protrusions forming a concentric pattern on the pressing surface of the electrode tip when the body plate is rotated by rotation of the cutter holder. , cutter assembly.
7. The method of claim 6,
The cutter assembly, wherein a locking projection is formed on one side of the body plate, and a locking groove into which the locking projection is inserted is formed in the cutter mounting portion.
8. The method according to claim 6 or 7,
The electrode tip consists of an upper electrode tip and a lower electrode tip,
The seating groove consists of upper and lower seating grooves formed to correspond to the upper and lower portions of the cutter holder,
The cutter blade part includes an upper cutter blade part formed to correspond to the upper seating groove on the other upper side of the body plate for dressing the upper electrode tip, and the other lower part of the body plate for dressing the lower electrode tip. A cutter assembly comprising a lower cutter blade portion formed to correspond to the lower seating groove.

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