KR102425147B1 - method and system for manufacturing automatically coated joint structure for friction welding - Google Patents

Abstract

In order to prevent corrosion between the base materials to be joined and to improve the bonding strength, the present invention provides a first step in which at least one free groove is formed on the upper surface of the friction welding rivet joint of the upper and lower plate members overlapped and laminated for bonding; a second step of filling the pre-groove with a thermosetting resin; and a friction welding rivet is inserted into the free groove, pressed and rotated, and a plasticizing region is formed by frictional heat, and a protective coating layer is formed on the interface of the plasticizing region by the thermosetting resin, and the upper plate member and the lower plate member It provides an automatic coating friction welding joining method comprising a third step of joining.

Description

Automatic coating friction welding joining method and joining system {method and system for manufacturing automatically coated joint structure for friction welding}

The present invention relates to an automatic coating friction welding joining method and a joining system, and more particularly, to an automatic coating friction welding joining method and joining system in which corrosion between base materials to be joined is prevented and bonding strength is improved.

In general, in the automobile industry, a case of reducing the weight of a vehicle body by applying a soft material such as aluminum or magnesium to the vehicle body in order to improve fuel efficiency according to environmental problems is widely applied.

A technology for processing a soft material such as aluminum and magnesium and forming a product is actively progressing. Here, in the method of bonding between soft materials or bonding different materials of a soft material and a steel material, welding methods such as laser, arc and spot welding cannot be applied due to the physical properties of the soft material, so mechanical bonding or bonding method is not applicable. It is currently limited.

And, as a method of joining base materials including a soft material, a method of mechanically joining base materials overlapping each other using fastening elements such as bolts, nuts, and rivets is used. In particular, bonding of parts through riveting is widely used in automobiles, electronic devices, various industrial instruments, and industrial structures.

Here, in the prior art, a process in which each member is pierced by frictional heat by rotating a rivet on a member of different dissimilar materials and joined to each other by frictional heat with the rivet is disclosed. At this time, a rotation driving means is provided that is engaged with the head of the rivet to transmit rotational force.

However, while the rivet is rotated, the chip is discharged from the member in which the plasticizing region is formed and is scattered around the plasticizing region.

In addition, since the predetermined plasticizing region is not accurately marked on the member, there is a problem in that the portion to which the rivet is fastened is not formed at a predetermined position but is formed at a position different from the predetermined position.

However, in the junction between dissimilar metal parts, there is a problem in that galvanic corrosion occurs due to an electrochemical potential difference due to electrical contact between the rivet and the metal part as well as the metal part.

Such galvanic corrosion not only deteriorates the appearance of the riveted part, but also lowers the mechanical fastening strength, which may lead to structural damage. Accordingly, in order to prevent galvanic corrosion and secure corrosion resistance at the rivet fastening part of the joint parts, a method of applying organic coating, room temperature curing adhesive, etc. is applied.

However, when the organic coating is applied, there is a problem in that it is difficult to form a continuous and uniform coating film because the adhesion to the existing paint film is weak. In addition, since the coating film thickness is relatively thin at the angled corners to form a non-uniform coating layer, there is a problem in that it is difficult to secure long-term corrosion resistance.

Korean Patent Registration No. 10-1505910

In order to solve the above problems, an object of the present invention is to provide an automatic coating friction welding joining method and a joining system in which corrosion between base materials to be joined is prevented and bonding strength is improved.

In order to solve the above problems, the present invention provides an automatic coating friction welding joint structure in which an overlapping upper plate member and a lower plate member are joined with a friction welding rivet, through the frictional heat between the lower end of the friction welding rivet and the lower plate member. a first junction region joined by forming a contact digestion region; a second bonding area filled and joined between the first bonding area and the head of the friction welding rivet by forming an individual plasticizing area through frictional heat between the friction welding rivet and the upper plate member; And it provides an automatic coating friction welding joint structure comprising a protective coating layer provided along the interface between the first and the second joint region.

On the other hand, the present invention provides a first step in which at least one free groove is formed on the upper surface of the friction welding rivet joint of the upper plate member and the lower plate member stacked for joining; a second step of filling the pre-groove with a thermosetting resin; and a friction welding rivet is inserted into the free groove, pressed and rotated, and a plasticizing region is formed by frictional heat, and a protective coating layer is formed on the interface of the plasticizing region by the thermosetting resin, and the upper plate member and the lower plate member It provides an automatic coating friction welding joining method comprising a third step of joining.

On the other hand, the present invention is a forming device for forming at least one free groove by pressing and forming a friction welding rivet joint at a predetermined position on the upper surface of the upper plate member and the lower plate member stacked for joining; a resin supply device for filling the pre-groove with a thermosetting resin; and a friction welding rivet joining device that aligns, presses and rotates friction welding rivets in the free groove to form a plasticizing region by friction heat to join the upper plate member and the lower plate member. to provide.

Through the above solution means, the automatic coating friction welding joining method and joining system according to the present invention provides the following effects.

First, formed as the friction welding rivet is pressed and rotated on the upper plate member and the lower plate member Since the protective coating layer for preventing galvanic corrosion is automatically formed integrally on the interface between the first junction region and the second junction region, the Corrosion is significantly prevented, so durability and production efficiency can be remarkably improved.

Second, the pre-groove formed on the upper surface of the joint is formed in a concave state, so that the friction welding rivet is pressed and the chips generated during friction stir rotation are accommodated in the concave portion, so that excessive chips are exposed to the outside and generated is minimized, and its interior It can be prevented in advance that the thermosetting resin contained in the scattering to the outside.

Third, as the thermosetting resin forming the protective coating layer is cured by mediating the bonding between the first bonding area and the second bonding area, the bonding strength of the automatic coating friction welding bonding structure is significantly improved. can

1 is a flow chart showing an automatic coating friction welding joining method according to an embodiment of the present invention.
Figure 2 is an exemplary view showing a manufacturing method of the automatic coating friction welding joint structure according to an embodiment of the present invention.
3 is a cross-sectional view of an automatic coating friction welding joint structure according to an embodiment of the present invention.
Figure 4 is a perspective view showing a friction welding rivet of the automatic coating friction welding joint structure according to an embodiment of the present invention.
5A and 5B are exemplary views showing a method of manufacturing a pre-groove according to an embodiment of the present invention.
6 is a block diagram of an automatic coating friction welding joint system according to an embodiment of the present invention.

Hereinafter, an automatic coating friction welding joint structure and a joining method and a joining system thereof according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flowchart illustrating an automatic coating friction welding joining method according to an embodiment of the present invention, and FIG. 2 is an exemplary view showing a manufacturing method of an automatic coating friction welding joint structure according to an embodiment of the present invention. 3 is a cross-sectional view of an automatic coating friction welding joint structure according to an embodiment of the present invention, and FIG. 4 is a perspective view showing a friction welding rivet of an automatic coating friction welding joint structure according to an embodiment of the present invention. 5A and 5B are exemplary views showing a method of manufacturing a pregroove according to an embodiment of the present invention, and FIG. 6 is a block diagram of an automatic coating friction welding joining system according to an embodiment of the present invention.

Here, in the automatic coating friction welding manufacturing method of the present invention, the adhesive is applied to the inside of the free groove formed on the upper surface of different dissimilar materials, and then the adhesive is rotated while the rivet is rotated and the adhesive forms a protective film along the outer surface of the upper member by centrifugal force. At the same time, it is desirable to understand that it refers to a FEW (Friction Element Welding) chip and a corrosion-preventing bonding method as a method of absorbing chips generated by burring by the rotational force of the upper base material into the pre-groove portion. And, it is preferable to understand that automatic coating friction welding refers to rivet friction welding (RFW) as a bonding method in which two or more superimposed and laminated base materials are permanently connected using friction heat.

2 to 6, the automatic coating friction welding joining method according to the present invention proceeds as follows.

First, at least one free groove 11 is formed on the upper surface of the friction welding rivet joint (c) of the upper plate member 10 and the lower plate member 20 that are stacked for bonding (s10).

Here, it is preferable that the upper plate member layer 10a is laminated on the upper surface of the lower plate member 20 before the plate-shaped mold processing is prepared. In addition, the upper plate member layer 10a and the lower plate member 20 before the mold processing are provided with a metal material, and the upper plate member layer 10a before the mold processing is provided with a different metal material from the lower plate member 20 This is preferable. In addition, it is preferable that the upper plate member layer 10a and the lower plate member 20 before the mold processing are made of a metal material such as iron, aluminum, or magnesium.

At this time, the upper plate member layer 10a before the mold processing in a state in which the pre-groove 11 is not formed by the forming device 1 and the upper plate member 10 in which the pre-groove 11 is formed are separated It is desirable to understand In addition, it is preferable to understand that the upper plate member layer 10a and the upper plate member 10 are made of the same material before the mold processing.

And, in the present invention, the upper plate member 10 is provided with an aluminum material, and the lower plate member 20 is shown as an example provided with an iron material, but the upper plate member 10 and the lower plate member 20 are It is preferable to understand that a configuration provided with a metal other than aluminum and iron is also included in the scope of the present invention.

Here, the upper plate member 10 is preferably a flat plate formed of a soft metal material such as aluminum having a relatively lower melting point than the material provided in the lower plate member 20 . The lower plate member 20 may have a flat plate formed of a dissimilar metal material such as iron having a relatively higher melting point than a metal such as aluminum that may be provided on the upper plate member 10 .

Here, the forming device 1 presses and forms the friction welding rivet joint portion c at a predetermined position on the upper surfaces of the upper plate member 10 and the lower plate member 20, which are stacked and stacked for bonding, to at least one place. Preferably, the above pre-groove 11 is formed. In this case, the friction welding rivet joint portion (c) preferably means a plasticizing region in which the automatic coating friction welding joint structure 100 is formed. In addition, the free groove 11 is formed in a stage before the plasticizing region is formed by the rotational friction heat of the friction welding rivet 110 on the upper surface of the upper plate member 10 of the friction welding rivet joint portion (c). desirable.

In addition, it is preferable that the upper plate member 10 is press-molded in the forming device 1 to protrude at least one pressing protrusion 1a forming the free groove 11 . At this time, the pressing protrusion 1a may be formed in a semicircular shape in which a plurality of protruding protrusions at a predetermined interval on one side of the forming device 1 is reduced toward the protruding end side.

Accordingly, as the forming device 1 is pressed to the upper surface of the upper plate member 10 , a plurality of the free grooves 11 may be simultaneously formed on one side of the upper plate member 10 . Therefore, compared to the conventional manufacturing method in which each of the pre-groove 11 is individually formed, the working time is reduced and productivity can be significantly increased.

Here, the diameter of the pressing projection (1a) is preferably set to be greater than or equal to the diameter of the friction welding rivet (110). That is, the diameter of the free groove 11 formed on the upper surface of the upper plate member 10 to correspond to the shape of the pressing protrusion 1a is preferably set to be greater than or equal to the diameter of the friction welding rivet 110 .

Here, a plurality of free grooves 11 are formed on one side of the upper surface of the upper plate member 10 at predetermined intervals, and each of the free grooves 11 is preferably understood as a groove shape whose radius decreases from the upper surface to the lower surface. do. Accordingly, the contact tip 130 formed on the lower side of the friction welding rivet 110 may be rotated while being inserted into the groove of the upper plate member 10 formed by the free groove 11 .

On the other hand, the pre-groove 11 is filled with a thermosetting resin 30a (s20). Here, the resin supply device 2 preferably fills the pre-groove 11 formed on the upper surface of the upper plate member 10 with the thermosetting resin 30a including an epoxy resin and the adhesive protection resin 30b. do. In detail, the resin supply device 2 may include a first nozzle for filling the thermosetting resin 30a and a second nozzle for filling the adhesive protection resin 30b along the entire area of the free groove 11 . can

And, after the adhesive protection resin 30b is filled on the upper surface of the top plate member 10 in which the free groove 11 is formed, the thermosetting resin 30a is filled on the upper surface of the adhesive protection resin 30b. desirable.

In this case, the thermosetting resin 30a may be made of a material including an epoxy resin or the like. Here, the epoxy resin may be used without particular limitation as long as it has two or more epoxy groups. For example, bisphenol A type epoxy resin, dicyclopentadiene type epoxy resin, diamino diphenyl methane type epoxy resin, aminophenol type epoxy resin, naphthalene type epoxy resin, phenol novolak type epoxy resin, biphenyl type epoxy resin , a hydrogenated biphenol-type epoxy resin, an alicyclic epoxy resin, and a mixture thereof may be provided. That is, an epoxy resin can be used individually or in combination of 2 or more types, respectively. In addition, the epoxy resin may be one to which an oxetane compound or a vinyl ether compound is added.

In addition, the adhesive protection resin 30b may be provided with the same material as the thermosetting resin 30a or may be provided with a different material. In this case, the adhesive protection resin 30b may be applied to the entire upper surface of the free groove 11 to a predetermined thickness.

Here, the thermosetting resin 30a is preferably cured according to a preset temperature and time, and the thermosetting resin 30a cured according to a preset temperature and time is described and illustrated as a protective coating layer 30. desirable. A detailed description of the thermosetting resin 30a will be described later.

On the other hand, the friction welding rivet 110 is inserted into the free groove 11, pressed and rotated, and a plasticizing region is formed by frictional heat (s30). In addition, the protective coating layer 30 is formed on the interface by the thermosetting resin 30a, and the upper plate member 10 and the lower plate member 20 are joined (s30). Here, it is preferable to understand that the plasticization region includes a fusion plasticization region (a) and an individual plasticization region (b).

And, the friction welding rivet joining device 3 aligns the friction welding rivet 110 in the free groove 11, pressurizes and rotates the fusion plasticization area (a) and the individual plasticization area (a) by frictional heat ( It is preferable to form b) to join the upper plate member 10 and the lower plate member 20 .

Here, the friction welding rivet 110 is preferably formed of the same type of metal as the lower plate member 20 . At this time, the meaning of the same material may be different in component ratios and additives of the friction welding rivet 110 and the lower plate member 20, but it is preferable to understand that the main component of the metal is a material formed of the same material. For example, when the lower plate member 20 is made of an iron material, the friction welding rivet 110 may be made of an iron material. Here, the friction welding rivet 110 is provided with an iron material and may further include additives, but the main component is iron, so it is preferable to understand it as the same material as the lower plate member 20 .

In addition, it is preferable that the friction welding rivet 110 includes a body portion 120 , the contact tip 130 , and a head portion 140 . Here, the body part 120, the contact tip 130, and the head part 140 refer to each part of the friction welding rivet 110 according to functions and positions, but are integrally formed as one member. It is desirable to understand

Here, the contact tip 130 is inserted into the free groove 11 so as to form a plasticizing region through frictional heat during rotation from the free groove 11 of the preformed upper plate member 10, the contact friction area is It is preferable to be provided in a wedge shape so that the plasticization area is gradually increased. At this time, the wedge shape is preferably understood as a narrowed end.

In addition, the upper plate member 10 and the lower plate member 20 may be disposed in close contact with each other or in close contact with each other depending on their respective shapes when stacked. In this case, the friction welding rivet joint (c) preferably means a target part to be friction welded by the friction welding rivet (110). In addition, the friction welding rivet joint portion (c) may be preset as a portion in which the upper plate member 10 and the lower plate member 20 are in close contact with each other, which does not adversely affect functions, uses, etc. during welding.

In addition, the contact tip 130 may be provided in the shape of an inverted cone or polygonal pyramid whose cross-sectional area is narrowed toward the bottom. At this time, the contact tip 130 is rotated and pressed downward while the lower end is in point contact with one side of the free groove 11, and is plasticized in the friction welding rivet joint portion c by the frictional heat generated during rotation. and can be inserted. In detail, the contact tip 130 is formed of iron, which is the same metal as the lower plate member 10, so that the strength of the metal is higher than that of the upper plate member 10 made of a soft metal material such as aluminum. . Accordingly, since the contact tip 130 is pressed and rotated on the free groove 11 formed in the upper plate member 10, the upper plate member 10 may be melted as the rotational friction temperature rises.

Here, since the friction welding rivet 110 is pressed and rotated while being inserted into the free groove 11, scattering of chips generated during the piercing process can be prevented. In this case, it is preferable to understand the meaning of scattering as the meaning that the chip is directly discharged into the atmosphere without passing through a predetermined outlet.

In addition, the rotational friction temperature generated as the friction welding rivet 110 rotates on the upper plate member 10 and the lower plate member 20 may be increased to a maximum of about 950 ~ 1000 °C. In addition, as the contact tip 130 is gradually inserted downward, the contact friction area between the inclined circumferential surface of the contact tip 130 and the friction welding rivet joint portion c increases, and the plasticizing area is the friction It may extend radially outward and downward of the welding rivet 110 .

Accordingly, since the lower end of the contact tip 130 inserted into the free groove 11 is rotated while being supported by the non-plasticized upper plate member 10 outside the plasticization region, the rotation position of the contact tip 130 . can be kept stable. At this time, since the contact tip 130 plasticizes the upper plate member 10 and the lower plate member 20 through frictional heat during rotation, the upper plate member 10 softened through plasticization without a separate supporting means such as an anvil. And it can be easily inserted through the interior of the lower plate member (20).

On the other hand, the body part 120 is a part connected to the upper end of the contact tip 130 , and is inserted into the plasticizing region following the contact tip 130 , and the upper plate member 10 and the lower plate member 20 . ) can be arranged to be in contact with. At this time, the body part 120 is rotated integrally with the contact tip 130, and the circumferential surface of the body part 120 is the upper plate member 10 and the lower plate member of the friction welding rivet joint part (c). Frictional heat may be continuously supplied to the portion through which the contact tip 130 has passed while in contact with the 20 .

In addition, it is preferable that the stirring groove 120a recessed in the radial direction is formed in the body part 120 along the lower area connected to the contact tip 130 so as to promote the stirring flow of the plasticizing area. That is, the stirring groove 120a may be formed such that the upper end is spaced apart from the head 140 and the lower end is connected to the contact tip 130 .

Accordingly, the plasticizing state of the upper plate member 10 and the lower plate member 20 inside the friction welding rivet joint portion (c) is maintained, and the plasticization region is radially outward of the friction welding rivet 110. can be expanded. At the same time, the upper plate member 10 and the lower plate member 20 in a plasticized state in contact with the circumferential surface of the body part 120 are rotatably flowed by receiving the rotational force of the body part 120, and are engaged with a large amount. bonds can be formed.

At this time, when the supply of frictional heat through the rotation of the body portion 120 and the contact tip 130 is blocked, the upper plate member 10 and the lower plate member 20 in the friction welding rivet joint portion c are entangled with each other. It may be solidified in a state of being solidified to form a stirring bond, and may be adhered to and bonded to the surface of the body portion 120 .

Accordingly, the upper plate member 10 and the lower plate member 20 form a bond with each other through agitation bonding, and the body part 120 is between the upper plate member 10 and the lower plate member 20 layers. It is desirable to form a bridge. Accordingly, since the body part 120 forms a bridge between the layers of the upper plate member 10 and the lower plate member 20 , the strength in the lateral direction and the longitudinal direction of the plasticizing region may be improved.

In addition, the head portion 140 is preferably formed to protrude stepwise outward in the radial direction of the friction welding rivet 110 from the upper end of the body portion 120 . That is, the head part 140 is provided to have a cross-sectional area extending radially outward from the cross-sectional area of the body part 120 . In detail, the body part 120 and the contact tip 130 are preferably inserted into the upper plate member 10 and the lower plate member 20 . Accordingly, the upper plate member 10 and the lower plate member 20 in the plasticizing region may be pushed out by the inserted body portion 120 and the contact tip 130 and discharged upward.

Here, the head part 140 covers the upper plate member 10 discharged upward while covering the upper part of the upper plate member 10 and presses it downward. Accordingly, the upper plate member 10 discharged upward is refilled to the lower portion of the head part 140, and the density and mutual coupling strength between the upper plate member 10 and the friction welding rivet 110 can be increased. have.

In addition, the lower surface portion 32 of the head portion 140 is preferably formed to be inclined upward toward the radially inner side. In addition, an external force transmission unit 141 coupled to the friction welding rivet coupling device 3 and integrally rotated may be provided on the upper surface of the head unit 140 . Accordingly, as the external force transmitting unit 141 is engaged with the friction welding rivet coupling device 3 , the rotational force and pressing force of the friction welding rivet coupling device 3 are applied to the body portion 120 and the contact tip 130 . ) can be transferred to

Here, in the external force transmitting unit 141, a wedge-shaped groove provided with a rotational force transmitting surface 141a and a pressing force transmitting surface 141b may be formed in multiple steps in the circumferential direction along the upper edge of the head unit 140. . At this time, the rotational force transmission surface (141a) is provided as a vertical cross-section machined radially inwardly from the edge of the head portion 140, and is engaged through a chuck provided at the end of the friction welding rivet coupling device (3). Stable rotational force transmission is possible.

Further, the pressing force transmission surface 141b is cut from the radially inner end of the rotational force transmission surface 141a in the opposite direction, and is formed to be inclined downward toward the radially outer side. Accordingly, some of the downward pressing force applied to the head unit 140 may be converted radially inward along the inclined direction of the pressing force transmission surface 141b. And, since the external force transmitting unit 141 provides a constraining force toward the rotational center, the rotational center is stably maintained and the amount of vibration can be minimized even during high-speed rotation.

Accordingly, the friction welding rivet 110 is pressed and rotated at a high speed toward the upper plate member 10 and the lower plate member 20, and the upper plate member 10 and the lower plate member 20 are plasticized through frictional heat. It is preferably inserted into and coupled to the upper plate member 10 and the lower plate member 20 .

In this case, the friction welding rivet 110 may induce agitation bonding between the upper plate member 10 and the lower plate member 20 . Here, it is preferable to understand that the stir welding is entangled and engaged with each other as the upper plate member 10 and the lower plate member 20 plasticized by frictional heat flow by the rotational force of the friction welding rivet 110 .

Here, it is preferable to form the fusion plasticization region (a) through frictional heat between the lower end of the friction welding rivet (110) and the lower plate member (20) to form the joined first bonding region (101). At this time, as the friction welding rivet 110 is rotated at high speed and pressed in the first joining region 101, the body portion 120, the contact tip 130, and the lower plate member 20 are plasticized, respectively. It is preferable to understand it as a region joined by stirring and fusion welding in a state of being in the same state. And, referring to FIG. 3 , the fusion plasticization region (a) is preferably understood as an upper region of the illustrated dotted line (a), and it is preferable to understand that it refers to a region in which the first junction region 101 is formed.

And, since the friction welding rivet 110 and the lower plate member 20 are made of the same type of metal, they can be formed in a continuous form as they are stirred and joined. Here, the body portion 120 and the contact tip 130 may be melted according to the rotational friction heat and may flow outward in the radial direction of the friction welding rivet 110 . Accordingly, the body portion 120 and the contact tip 130 may protrude one side of the upper plate member 10 upward.

In addition, the individual plasticizing region b is formed through frictional heat between the friction welding rivet 110 and the upper plate member 10 to form the first bonding region 101 and the head portion of the friction welding rivet 110 . It is preferable that the second bonding region 102 to be filled and bonded between 140 is formed. At this time, the second junction region 102 is understood as a region formed by protruding upward from the upper surface member 10 by the protruding region of the first junction region 101 and being covered by the head unit 140 . This is preferable. And, referring to FIG. 3 , the individual plasticization region (b) is preferably understood as an upper region of the illustrated dotted line (b), and is preferably understood as referring to a region in which the second bonding region 102 is formed. Of course, although not shown in the drawings, the individual plasticizing region b may remain along the boundary surface of the first bonding region 101 in the lower plate member 20 .

Here, since the friction welding rivet 110 is pressed and rotated while being inserted into the pre-groove 11, the chips generated in the piercing process are not discharged to the outside of the free groove 11 and are melted by the heat of rotational friction. can be That is, since the pre-groove 11 is recessed inside the upper plate member 10 , even if the chips generated during piercing are scattered, they can be re-introduced from the outer edge of the pre-groove 11 into the groove on the central side.

In addition, the free groove 11 can prevent in advance that the thermosetting resin 30a disposed on the upper surface is scattered to the outside of the free groove 11 when the friction welding rivet 110 is pressed and rotated.

Therefore, the pre-groove 11 formed on the upper surface of the friction welding rivet joint (c) is formed in a concave state, so that the friction welding rivet 110 is pressed and the chips generated during friction stir rotation are accommodated in the concave portion. The occurrence of the chip being exposed to the outside can be minimized. In addition, it is possible to prevent the thermosetting resin 30a accommodated in the free groove 11 from scattering to the outside in advance.

In addition, the thermosetting resin 30a is preferably coated along the outer surface by the rotational force of the friction welding rivet 110 . In detail, the thermosetting resin 30a is formed as the friction welding rivet 110 presses the upper plate member 10 and the lower plate member 20 and rotates at a high speed to form the first joining region 101 and the second It is preferable to be coated along the interface of the bonding region 102 .

At this time, it is preferable that the protective coating layer 30 is formed on the interface by the thermosetting resin 30a and the upper plate member 10 and the lower plate member 20 are joined. In detail, it is preferable that the thermosetting resin 30a coated along the interface between the first bonding region 101 and the second bonding region 102 is cured to form the protective coating layer 30 . At this time, it is preferable that the protective coating layer 30 is cured to mediate the bonding of the upper plate 10 and the lower plate 20 .

Here, the protective coating layer 30 is preferably formed by curing the thermosetting resin 30a according to a preset temperature and time. In detail, it is preferable that the preset temperature is set at 160 to 200° C., and the preset time is set between 20 to 40 minutes. At this time, the protective coating layer 30 is preferably formed of a thermosetting resin (30a) containing an epoxy resin.

At this time, the friction welding rivet 110 is inserted into the free groove 11 formed on the outer surface of the upper plate member 10 and is pressed and rotated to generate frictional heat, and the thermosetting resin 30a is formed by the frictional heat. can be hardened. In detail, the thermosetting resin 30a flows to the interface of the plasticizing region by centrifugal force, and is evenly distributed on the interface of the plasticizing region by adhesion according to the surface tension, so that the protective coating layer 30 is formed while the upper plate member ( 10) and the lower plate member 20 are preferably joined.

In addition, when the preset temperature at which the thermosetting resin 30a is cured is less than 160° C., there is a risk that the coating may not be performed along the interface between the first bonding area 101 and the second bonding area 102 . In addition, even when the preset temperature is cured at 200° C. or higher, there is a risk that the thermosetting resin 30a may not be cured along the interface between the first bonding area 101 and the second bonding area 102 .

Accordingly, as the preset temperature at which the thermosetting resin 30a is cured is set to 160 to 200° C., the protective coating layer 30 along the interface between the first junction region 101 and the second junction region 102 . ) is preferably formed.

Accordingly, the protective coating layer 30 forms the upper plate member 10 and the lower plate member 20 as the friction welding rivet 110 rotates at high speed and is pressed against the upper plate member 10 and the lower plate member 20 . ) and can be cured by being disposed on the interface of

In addition, the protective coating layer 30 is preferably formed up to the portion where the second bonding region 102 and the head portion 40 are connected. That is, the protective coating layer 30 is preferably formed to cover the outermost portion of the interface so that the interface formed between the first junction region 101 and the second junction region 102 does not come into contact with external air.

Accordingly, the friction welding rivet 110 is formed as the upper plate member 10 and the lower plate member 20 are pressed and rotated. Since the protective coating layer 30 for preventing galvanic corrosion is automatically formed on the interface between the first junction region 101 and the second junction region 102 integrally, corrosion at the junction interface of dissimilar plates is significantly prevented, resulting in durability and durability. Production efficiency can be significantly improved.

In addition, as the thermosetting resin 30a forming the protective coating layer 30 is cured by mediating the bonding between the first bonding region 101 and the second bonding region 102, the bonding strength further increases, so that the above The bonding strength of the automatic coating friction welding joint structure 100 can be significantly improved.

On the other hand, referring to FIG. 3 , the automatic coating friction welding joint structure 100 is preferably formed by joining the upper plate member 10 and the lower plate member 20 superimposed on each other with the friction welding rivet 110 . .

The upper plate member 10 and the lower plate member 20 are preferably made of a metal material, and the upper plate member 10 is made of a material different from that of the lower plate member 20 . In addition, the upper plate member 10 and the lower plate member 20 is preferably provided with a metal material such as iron, aluminum, magnesium. For example, the upper plate member 10 may be made of an aluminum material, and the lower plate member 20 may be made of an iron material.

Here, it is preferable that the first joining area 101 is joined by forming the fusion and plasticizing area a through frictional heat between the lower end of the friction welding rivet 110 and the lower plate member 20 . At this time, as the friction welding rivet 110 is rotated at high speed and pressed, the first bonding region 101 is formed by melting the body portion 120 and the contact tip 130 and the lower plate member 20 . It is desirable to understand it as an area. And, since the friction welding rivet 110 and the lower plate member 20 are made of the same material, they can be formed in a continuous form as they are melted and joined.

In addition, the second bonding area 102 forms the individual plasticizing area b through frictional heat between the friction welding rivet 110 and the upper plate member 10 to form the first bonding area 101 and the friction. It is preferable that the welding rivet 110 is filled and joined between the head portions 140 . In this case, the second junction region 102 may be formed to protrude upward from the upper surface member 10 by the protruding region of the first junction region 101 , and be covered by the head unit 140 . .

In addition, the protective coating layer 30 is preferably provided along the interface between the first junction region 101 and the second junction region 102 . Here, it is preferable that the protective coating layer 30 is formed on the interface by the thermosetting resin 30a and the upper plate member 10 and the lower plate member 20 are joined. At this time, the protective coating layer 30 is preferably formed of a thermosetting resin (30a) containing an epoxy resin.

In detail, it is preferable that the thermosetting resin 30a coated along the interface between the first bonding region 101 and the second bonding region 102 is cured to form the protective coating layer 30 . Here, the protective coating layer 30 is preferably formed by curing the thermosetting resin 30a according to a preset temperature and time. In detail, it is preferable that the preset temperature is set at 160 to 200° C., and the preset time is set between 20 to 40 minutes. Accordingly, the protective coating layer 30 forms the upper plate member 10 and the lower plate member 20 as the friction welding rivet 110 rotates at high speed and is pressed against the upper plate member 10 and the lower plate member 20 . ) and can be cured by being disposed on the interface of

In addition, the protective coating layer 30 is preferably formed up to the portion where the second bonding region 102 and the head portion 40 are connected. That is, the protective coating layer 30 is preferably formed to cover a point where the interface formed between the first junction region 101 and the second junction region 102 comes into contact with external air.

On the other hand, the friction welding rivet 110 is formed of the same material as the lower plate member 20, at this time, the meaning of the same material is the composition ratio and additives of the friction welding rivet 110 and the lower plate member 20 Although some may be different, it is preferable to understand that the main component constituting the metal is a material formed of the same material. For example, when the lower plate member 20 is made of an iron material, the friction welding rivet 110 may be made of an iron material. Here, the friction welding rivet 110 is provided with an iron material and may further include additives, but the main component is iron, so it is preferable to understand it as the same material as the lower plate member 20 .

In addition, it is preferable that the friction welding rivet 110 includes the body part 120 , the contact tip 130 , and the head part 140 . Here, the body part 120, the contact tip 130, and the head part 140 refer to each part of the friction welding rivet 110 according to functions and positions, but are preferably integrally formed as one member. do.

On the other hand, the automatic coating friction welding bonding system 200 according to an embodiment of the present invention is provided including the forming device (1), the resin supply device (2), the friction welding rivet bonding device (3).

Here, the forming device 1 presses and forms the friction welding rivet joint portion c at a predetermined position on the upper surfaces of the upper plate member 10 and the lower plate member 20, which are stacked and stacked for bonding, to at least one place. It is preferable to understand the above-mentioned device for forming the pre-groove 11 .

In addition, it is preferable that the upper plate member 10 is press-molded in the forming device 1 to protrude at least one pressing protrusion 1a forming the free groove 11 . Here, the pressing protrusion 1a may be formed in a semicircular shape such that a plurality of protrusions at a predetermined interval on one side of the forming device 1, the radius decreases toward the end side. In addition, the end of the pressing protrusion 1a may be provided in the shape of an inverted cone or polygonal pyramid whose cross-sectional area becomes narrower toward the bottom.

At this time, the diameter of the pressing projection (1a) is preferably set to be greater than or equal to the diameter of the friction welding rivet (110). That is, the diameter of the free groove 11 formed on the upper surface of the upper plate member 10 to correspond to the shape of the pressing protrusion 1a is preferably set to be greater than or equal to the diameter of the friction welding rivet 110 .

Accordingly, as the forming device 1 is pressed to the upper surface of the upper plate member 10 , a plurality of the free grooves 11 may be simultaneously formed on one side of the upper plate member 10 . Accordingly, compared to the conventional manufacturing method in which each of the pre-groove 11 is separately formed, the working time is reduced and productivity can be significantly increased. Furthermore, since the forming device 1 forms the free groove 11 at the preset position of the friction welding rivet joint portion c, the precision during manufacturing can be significantly increased.

On the other hand, the resin supply device (2) includes a first nozzle for filling the thermosetting resin (30a) and a second nozzle for filling the adhesive protection resin (30b) along the entire area of the free groove (11) can be Here, the resin supply device (2) is filled with the thermosetting resin (30a) containing an epoxy resin and the adhesive protection resin (30b) in the free groove (11) formed on the upper surface of the upper plate member (10) desirable.

On the other hand, the friction welding rivet joining device 3 aligns the friction welding rivet 110 in the free groove 11 and pressurizes and rotates it to generate the fusion plasticization region (a) and the individual plasticization region by friction heat. It is preferable to understand as a device for bonding the upper plate member 10 and the lower plate member 20 by forming (b). Here, on one side of the friction welding rivet coupling device 3 , a rotation-type combination protrusion may be formed to correspond to the external force transmission part 141 of the head part 140 provided in a wedge-shaped groove shape.

Accordingly, the rotation-type combination protrusion of the friction welding rivet coupling device 3 may be coupled to the external force transmission unit 141 formed on the head unit 140 and rotated integrally. Accordingly, the friction welding rivet coupling device 3 may be engaged with the external force transmission unit 141 to stably transmit rotational force and pressing force to the body unit 120 and the contact tip 130 .

In this case, terms such as "include", "compose", "comprise" or "have" described above mean that the corresponding component may be inherent, unless otherwise stated. It should be construed as not excluding components, but may further include other components. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms commonly used, such as those defined in the dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

As described above, the present invention is not limited to each of the above-described embodiments, and variations can be implemented by those of ordinary skill in the art to which the present invention pertains without departing from the scope of the claims of the present invention. and such modifications are within the scope of the present invention.

100: automatic coating friction welding joint structure 1: forming device
2: Resin supply device 3: Friction welding rivet joining device
10: top plate member 11: free groove
20: lower plate member 30: protective coating layer
110: friction welding rivet

Claims (13)

delete delete delete delete delete A first step of forming at least one free groove on the upper surface of the friction welding rivet joint of the upper plate member and the lower plate member overlapped for joining;
a second step of filling the pre-groove with a thermosetting resin; and
A friction welding rivet is inserted into the free groove, pressed and rotated, and a plasticizing region is formed by frictional heat, and a protective coating layer is formed on the interface of the plasticizing region by the thermosetting resin, and the upper plate member and the lower plate member are joined Automatic coating friction welding joining method comprising a third step. 7. The method of claim 6,
In the third step, a fusion plasticizing region is formed through frictional heat between the lower end of the friction welding rivet and the lower plate member to form a joined first junction region,
An individual plasticizing region is formed through frictional heat between the friction welding rivet and the upper plate member to form a second bonding area filled and joined between the first bonding area and the head of the friction welding rivet;
The automatic coating friction welding joining method, characterized in that the protective coating layer is automatically formed by centrifugal force according to rotation along the interface between the first joint region and the second joint region. 7. The method of claim 6,
In the first step, the diameter of the free groove is automatic coating friction welding joining method, characterized in that set to be greater than or equal to the diameter of the friction welding rivet. 7. The method of claim 6,
In the third step, the friction welding rivet is an automatic coating friction welding welding method, characterized in that the rotation is rotated so that the friction temperature due to rotation friction is 950 ~ 1000 ℃. 7. The method of claim 6,
The thermosetting resin is an automatic coating friction welding bonding method, characterized in that the thermosetting temperature is set between 160 ~ 200 ℃ and the time is set between 20 ~ 40 minutes. a forming device for forming at least one free groove by press-forming a friction welding rivet joint at a predetermined position on the upper surfaces of the upper and lower plate members stacked for bonding;
a resin supply device for filling the pre-groove with a thermosetting resin; and
and a friction welding rivet joining device for joining the upper plate member and the lower plate member by aligning the friction welding rivets in the free groove, pressing and rotating them to form a plasticizing region by friction heat. 12. The method of claim 11,
Automatic coating friction welding joining system, characterized in that the upper plate member is press-molded in the forming device, and at least one pressing protrusion forming the free groove protrudes. 12. The method of claim 11,
The friction welding rivet joining device forms a fusion plasticization region through frictional heat between the lower end of the friction welding rivet and the lower plate member to form a first joint region joined together, and individually plasticizes through frictional heat between the friction welding rivet and the upper plate member When the friction welding rivet rotates to form a second bonding area filled and joined between the first bonding area and the head of the friction welding rivet by forming an area,
The automatic coating friction welding joining system, characterized in that the protective coating layer is automatically formed along the boundary surface between the first joint region and the second joint region.

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