KR101059250B1 - Crossbeam and its manufacturing method - Google Patents

Abstract

The present invention relates to a cross beam and a method for manufacturing the same, the vertical hollow portion communicating with both sides along the axial direction and having a rectangular hole shape in the vertical direction, and formed on both sides with respect to the longitudinal hollow portion and both sides along the axial direction. And a cross beam including a horizontal hollow portion communicating in a horizontal direction and having a rectangular hole shape in a horizontal direction.

The present invention can reduce the weight by designing a cross beam to form a hollow portion while making a surface contact with a plurality of split beams, and improve the bonding characteristics by friction stir welding the upper side of the joint portion of the split beam, and friction stir Higher rigidity can be obtained than the existing joint by soldering the lower part of the joint using heat generated and transferred at the joint.

Cross Beam, Friction Stir Welding, Soldering, Composite Bonding

Description

CROSS-BEAM AND MANUFACTURE METHOD THEREOF

The present invention relates to a cross beam, and more particularly, it is possible to reduce the weight by designing a cross beam to form a hollow portion while making surface contact with a plurality of split beams, and bonding characteristics by friction stir welding the upper side of the edge joint portion of the split beam. The present invention relates to a cross beam and a method of manufacturing the same, which can achieve higher rigidity than conventional joints by soldering a lower portion of a joint using heat generated and transmitted during friction stir welding.

In general, coating or thin films or materials such as glass substrates or wafers are used in the field of manufacturing flat panel displays (FPDs) such as plasma display panels (PDPs) and liquid crystal panels (LCDs), or semiconductor device manufacturing fields and various other fields. The linear motor or linear guides such as rotary motors and ball screws are used for forming, cutting, or inspection to detect defects. Various types of stage feeders, such as air bearing XY stages, have been developed and used.

In particular, the existing stage conveying apparatus has a cross beam in which the conveyed object is slidably supported.

The conveyed material is moved along the crossbeam by a linear motor or along the crossbeam by a rotating motor and a ball screw, and is conveyed with them by being equipped with a device for inspecting or processing materials such as glass substrates. In addition, the material may be chucked or clamped to directly transfer a material such as a glass substrate.

The crossbeam is placed transversely on the table to provide a conveying path for the conveyed material and to support the load of the conveyed material.

In particular, as the glass substrates used in LCD manufacturing are expanded to the 8th generation, that is, 2400 mm × 2500 mm, the equipment for processing or inspecting the 8th generation glass substrates is inevitably larger. The beam also increased in length.

When the cross beam of the existing stage feeder sags, it adversely affects the precision of processing or inspection of the material. The longer the length, the greater the sag, which requires high rigidity to prevent the cross beam. Increasing the stiffness of the causes an increase in weight, but rather increases the deflection and increases the burden on the installation member of the crossbeam. In other words, as the length of the crossbeam increases, the amount of deformation inevitably increases, and in order to reduce the amount of deformation, the rigidity needs to be increased, and increasing the rigidity increases the crossbeam cross section, increases the unit load, and increases the cross section of the required size. Branches cause limitations in the extrusion capacity of the beam. Therefore, there is a need for improvement.

The present invention has been made to improve the above problems, to provide a cross-beam and a method of manufacturing the same to achieve a lighter weight than the conventional by forming a hollow portion to divide the cross beam into a plurality of split beams to be bonded to the edges. The purpose is. In addition, the present invention achieves high strength as the bottom side of the joint is soldered by friction stir welding the upper portions of the joints which face each other to the edges of the split beam, and heat is generated during the friction stir welding. The purpose of the present invention is to provide a cross beam and a method for manufacturing the same.

The crossbeam according to the present invention comprises: a longitudinal hollow portion communicating with both sides along the axial direction and having a rectangular hole shape in the vertical direction, and formed on both sides with respect to the longitudinal hollow portion and communicating with both sides along the axial direction, and horizontal It includes a horizontal hollow portion having a rectangular hole shape in the direction.

The cross beam is composed of a large split beam divided on the basis of the longitudinal center axis of the vertical hollow portion, and the opposing side edges of the large split beams are joined to form a joint.

The large split beam is formed of a small split beam divided on the basis of the horizontal center axis of the horizontal hollow portion, and the opposing side edges of the small split beams are joined to form a joint.

The joint is characterized in that formed by friction stir welding.

The part where the large split beams are opposed to each other and the part where the small split beams are butted are inserted into the stirring pin of the friction stir welding tool on the upper side, and the solder bar is interposed on the lower side to be heat-transferred.

The solder bar is preferably to form a flux on the peripheral surface.

The method for manufacturing a cross beam according to the present invention includes: a small split beam forming step of forming a plurality of small split beams forming a main protrusion on both sides of an upper surface and a sub-projection on one side of the side adjacent to each of the main protrusions, the small division A first joining step of forming a plurality of large split beams in contact with the main protrusion of the beam to form a transverse hollow portion, and a second joining step of forming cross beams in which a longitudinal hollow part is formed by contacting the sub-projections of the large split beams It includes.

In particular, the first joining step, the first work preparation step of facing the main protrusions, the first solder bar interposition step of interposing a solder bar between the lower side of the main protrusion, and the rotating friction stir welding tool And a first composite bonding step of soldering the lower side between the main protrusions with the solder bar which is inserted by the stirring pin of the upper side between the main protrusions and melted by the heat transferred while stirring and bonding.

In addition, the second joining step, the second operation preparation step of placing the sub-projections facing each other, the second solder bar interposition step of interposing a solder bar on the lower side between the sub-projections, and the rotating friction stir welding tool And a second composite joint step of soldering the lower side between the sub-projections with the solder bar which is inserted into the upper side between the sub-projections, and is melted by the heat transferred while stirring and bonding.

As described above, the cross beam according to the present invention and a method for manufacturing the same, unlike the prior art, it is possible to achieve a lighter weight than the conventional by forming the hollow portion to divide the cross beam into a plurality of split beams to be bonded to the edges. In addition, the present invention obtains high strength by soldering the lower side of the joint with friction stir welding the upper sides of the joints which are joined to the edges of the split beams by friction stir welding, reducing the amount of deformation and reducing the manufacturing process and unit cost. You can.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a crossbeam and a method for manufacturing the same according to the present invention. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, the definitions of these terms should be made based on the contents throughout the specification.

1 is a perspective view of a cross beam divided into split beams according to an embodiment of the present invention, and FIG. 2 is a front view of a cross beam in which split beams are bonded to each other according to an embodiment of the present invention.

3 is a sectional view showing main parts of a composite beam bonded to split beams according to an embodiment of the present invention, and FIG. 4 is a sectional view showing main parts of a composite beam bonded to split beams according to an embodiment of the present invention.

5 is a cross-sectional view of a solder bar sandwiched between split beams according to an embodiment of the present invention.

6 is a flow chart illustrating a sequence in which the split beams are bonded to each other according to an embodiment of the present invention, and FIGS. 7 to 9 are cross beam shaping according to the sequence in which the split beams are bonded to each other according to an embodiment of the present invention. This is a state diagram showing the process.

1 and 2, the cross beam 100 according to an embodiment of the present invention serves to support the load of the conveyed object in the stage conveying apparatus, etc., the hollow hollow portion (110,130) in the axial direction To form.

That is, the crossbeam 100 is inclined downward by its own load as it has a sufficiently long length as the conveying material is enlarged.

Thus, the cross beam 100 reduces its own load by forming hollow portions 110 and 130 that are open to both sides along the axial direction.

In this case, the hollow parts 110 and 130 may be formed in various shapes along the axial direction of the cross beam 100, but the cross beam 100 may have the hollow parts 110 and 130 to maximize the bending stress or its own strength. It is desirable to minimize it within. In particular, the hollow parts 110 and 130 should be formed as large as possible within the range possible in order to reduce the load of the crossbeam 100, and at the same time, the hollow parts 110 and 130 should be formed as small as possible within the crossbeam 100 for strength. That is, the hollow parts 110 and 130 are preferably formed to a size that can optimize the load and strength of the crossbeam 100.

In addition, the cross beam 100 is formed to have a vertical hollow portion 110 and a horizontal hollow portion 130.

In this case, the vertical hollow portion 110 and the horizontal hollow portion 130 are formed to communicate with both sides of the cross beam 100, respectively.

Here, the vertical direction refers to the vertical direction when viewed in the drawings, and the horizontal direction refers to the horizontal direction when viewed in the drawings. That is, the central axis direction of the vertical hollow portion 110 with respect to the vertical direction is perpendicular to the central axis direction with respect to the horizontal direction of the horizontal hollow portion 130. Of course, the position of the vertical hollow portion 110 and the horizontal hollow portion 130 will vary depending on the position of the viewing field.

In particular, although the central axis direction of the longitudinal hollow portion 110 and the central axis direction of the horizontal hollow portion 130 may form an acute angle or an obtuse angle, they may be perpendicular to each other to prevent or minimize the deformation of the crossbeam 100. Preferably formed.

In addition, the crossbeam 100 is preferably formed to be divided into a minimum unit to be bonded to facilitate the design of the cross-sectional area by the required rigidity.

At this time, the cross beam 100 is able to bond both edges in the vertical direction by the vertical hollow portion 110, it is possible to bond both edges in the horizontal direction by the horizontal hollow portion 130.

Thus, the crossbeam 100 is easily joined to the minimum units.

In more detail, the cross beam 100 is composed of a large split beam 150 divided based on the longitudinal central axis of the longitudinal hollow portion 110.

For convenience, a plurality of large split beams 150 are formed in the same shape. For convenience, the large split beams 150 are illustrated as being provided in pairs.

At this time, since the large split beam 150 is divided based on the longitudinal center axis of the longitudinal hollow portion 110 of the cross beam 100, the sub-projection portion 120 protrudes from both sides of the same side. The sub-projection portion 120 is formed continuously along the axial direction of the large split beam 150.

Thus, when the large split beam 150 is joined to the sub-projection portions 120 corresponding to each other, the longitudinal hollow portion 110 is naturally formed.

Here, each of the large split beams 150 may separately protrude the sub-projection unit 120 on both sides, or may cut the remaining edges of one side except for the portion forming the sub-projection unit 120. In particular, the sub-projection unit 120 is preferably formed integrally with the large split beam 150.

In addition, the sub-projections 120 are preferably formed at both edges of the same side of the large-segment beam 150 so that the corresponding sub-projections 120 of the neighboring large-split beams 150 can be easily joined.

In particular, the opposing sub-projections 120 of the large split beam 150 are joined to form a junction 170. Here, the joint 170 is formed by friction stir welding (FSW).

In particular, the reason why the sub-projections 120 corresponding to each other of the adjacent large split beams 150 form the junction 170 by friction stir welding is to have sufficient bonding strength when the corresponding sub-projections 120 are joined. In addition, as a heat generated during friction stir welding, this is to realize a composite joint by soldering the sub-projection part 120 using a solder bar 188, which will be described later.

More specifically, referring to FIGS. 3 and 4, the junction 170 is formed by a friction stir welding tool 182 and a solder bar 188 having a shoulder 184 and a stirring pin 186.

The friction stir welding tool 182 is a joining tool capable of solid-phase joining at a temperature equal to or lower than the melting point of the sub-projection portion 120 to be joined.

That is, the friction stir welding performed by the friction stir welding tool 182 has a harder material than the sub protrusion 120 along the joint of the sub protrusion 120 which is a joint after fixing the large split beam 150. A portion of the non-consumable stirring pin 186 is inserted to include a sub-projection portion 120 facing a temperature sufficient to generate and soften frictional heat by the relative movement of the stirring pin 186 and the sub-projection portion 120. The junction is heated.

As a result, a stirring region portion 172, which will be described later, which is softened around the portion where the stirring pin 186 is inserted, is called "Third-body", is generated, and in this stirring region portion 172 By applying mechanical force to cause the stirring pin 186 to move along the bond line, the heated portion is extruded by the stirring pin 186, and the solid junction 170 is formed by the combination of frictional heat and mechanical processing.

In particular, the friction stir welding is divided into an AS (Advancing side) where the moving direction of the specimen and the rotation direction of the stirring pin 186 are the same, and an RS (Retreating side) in which the moving direction of the specimen and the traveling direction of the stirring pin 186 are opposite. do.

The friction stir welding tool 182 for such a bonding process includes a stirring pin 186 inserted between the neighboring sub-projections 120 to form a predetermined angle or vertical, and heated by the stirring pin 186. It consists of a shoulder 184 extending the portion, the shoulder 184 serves to press the softened portion of the joint including the opposing sub-projection 120 to form a smooth weld surface.

For example, the large split beam 150 including the sub-projection 120 is made of aluminum (Al), and the stirring pin 186 and the shoulder 184 are harder than the large split beam 150. And heat resistant alloys. That is, the stirring pin 186 and the shoulder 184 is made of hard steel than the sub-projection unit 120.

On the other hand, in friction stir welding, the insertion amount of the stirring pin 186 into the sub protrusion 120, that is, the insertion depth of the stirring pin 186 has a great influence on the quality of the joint 170. In particular, the portion where the stirring pin 186 is not inserted remains as an unbonded portion.

Here, the stirring pin 186 is inserted between the sub-projections 120 in the direction of the vertical hollow portion 110 corresponding to the direction perpendicular to the outer surface of the facing sub-projections 120.

In particular, when the amount of insertion of the stirring pin 186 into the sub-projection 120 is too small, the shoulder 184 does not come into contact with the outer surface of the sub-projection 120, causing defects, and the joint 170 It is too shallow for the sub-projection portion 120 to be in contact so that it does not have sufficient bonding strength.

In addition, when the amount of insertion of the stirring pin 186 is too large, and the shoulder 184 penetrates into the surface of the large split beam 150 too much, a recess is formed on the surface of the large split beam 150, which also causes defects. Due to the thickness of the stirring pin 186, a gap is generated inside the longitudinal hollow portion 110.

As a result, the stirring pin 186 is inserted to the upper half of the depth of the contact portion of the sub-projection 120, in particular, the upper side and the shoulder 184 is installed in a simple contact with the outer surface of the large split beam 150. This is preferred.

In addition, it is preferable that the solder bar 188 is interposed between the sub-projection portions 120 facing each other and adjacent to the vertical hollow portion 110.

The solder bar 188 is thinner than the thickness of the stirring pin 186. Thus, the lower sides between the opposing sub-projections 120 are soldered by frictional heat generated and transmitted during friction stir welding. In particular, the solder bar 188 is preferably formed as thin as possible to prevent the lower side of the portion in contact with the stirring pins 186.

Here, the solder bar 188 may be formed to be as long as the length of the large split beam 150 in the axial direction, or may be formed to be short and discontinuous.

The joint 170 includes a stirring region 172 joined by a friction stir welding tool 182 and a soldered section 176 joined by a solder bar 188.

In addition, as shown in FIG. 5, the solder bar 188 forms the flux 189 on the circumferential surface. The flux 189 serves to prevent the solder bar 188 from being oxidized by the heat transferred. In addition, the flux 189 serves to temporarily fix the solder bar 188 to the lower side between the large split beams 150 to which the solder bars 188 are opposed to each other. At this time, the flux 189 is to be formed on the peripheral surface of the solder bar 188 by a general method such as coating.

More specifically, the junction 170 of the large split beam 150 including the butted portion of the sub-projection 120 is divided into a stir zone 172 and a heat affected zone 174 by friction stir welding.

Here, the stirring region 172 is an upper region of the sub-projections 120 in contact with each other, and the heat affected region 174 is a lower region.

As an example, the stirring region 172 is a region where the solid state is bonded, and reaches a relatively high temperature, in particular, 500 to 550 캜 during friction bonding.

In addition, the heat affected zone 174 is a portion where the actual bonding is not made to be relatively low temperature, in particular about 450 ~ 500 ℃.

Accordingly, in order to satisfy the insufficient bonding force of the heat affected zone 174, the solder bars 188 soldered within the range of 450 to 500 ° C. are interposed below the sub-projections 120 contacted with each other, thereby causing friction. Since the solder joint is combined with the stirring joint in succession, the joint 170 can be formed over the entire joint surface of the sub-projections 120.

That is, a soldering part 176 through which the solder bar 188 is soldered is formed at a joint portion of the heat-affected region 174 that is in contact with the large split beams 150.

At this time, the solder bar 188 is preferably made of a material having a composition of 63Sn / 37Pb to be soldered in the 450 ~ 500 ℃ range.

On the other hand, each of the large split beam 150 is composed of a small split beam 160 divided on the basis of the horizontal central axis of the horizontal hollow portion 130 to divide the cross beam 100 by a minimum unit.

A plurality of small split beams 160 are formed in the same shape. For convenience, the small split beams 160 are illustrated as being provided in pairs in each large split beam 150.

At this time, since the small split beam 160 is divided based on the horizontal central axis of the horizontal hollow portion 130 of the cross beam 100, the main protrusion 140 is formed on both sides of the same side.

Thus, when the small split beam 160 is bonded to the main protrusions 140 corresponding to each other, the horizontal hollow portion 130 is naturally formed.

Here, each of the small split beams 160 may protrude separately from the main protrusion 140 on both sides, or may cut off the remaining edge of one side except for the portion forming the main protrusion 140. In particular, the main protrusion 140 is preferably formed integrally with the small split beam (160).

In particular, the cross beam 100 forms horizontal hollow portions 130 on both sides of the vertical hollow portion 110, and the horizontal hollow portion 130 is not connected to the vertical hollow portion 110. This is to allow the small split beams 160 to be in contact with each other at the edges for convenience of bonding.

In addition, the vertical hollow portion 110 is formed on both sides with respect to the horizontal hollow portion 130, each longitudinal center axis is preferably to be located in a straight line.

In addition, the main protrusion 140 is preferably formed at both edges of the same side of the small split beam 160 so that the corresponding main protrusion 140 of the neighboring small split beam 160 can be easily joined.

Accordingly, the cross beam 100 forms the smallest unit of the small split beam 160. The small split beam 160 forms a pair of main protrusions 140 on one side corresponding to the upper side or the lower side, and one sub-projection unit 120 on either side of the two sides connected in the vertical direction to the one side. Form.

Although the small split beam 160 includes the main protrusion 140 and the sub protrusion 120 together, for convenience, the main protrusion 140 is formed on both sides of the same side of the small split beam 160, and the sub protrusion ( It will be described that the 120 is formed on both sides of the same side of the large split beam (150).

In this case, the main protrusion 140 and the sub protrusion 120 are preferably continuously formed along the axial direction of the small split beam 160.

In addition, the main protrusion 140 of one of the small split beams 160 is joined to the main protrusion 140 of the other small split beam 160 to have a large split beam 150 having a horizontal hollow portion 130. The sub-projection portion 120 of one of the large split beams 150 is joined to the sub-projection portion 120 of the other large split beam 150 to form the longitudinal hollow portion 110 while cross beams are formed. 100 is molded.

The neighboring main protrusion 140, in particular, the main main protrusion 140 of the small split beam 160 are bonded to each other to form a junction 170. Here, the joint 170 is formed by friction stir welding (FSW).

In particular, the reason why the main protrusions 140 corresponding to each other of the neighboring small split beams 160 are formed by friction stir welding is to provide sufficient bonding strength when the corresponding main protrusions 140 are bonded. In addition, the solder bar (188) by melting the solder bar (solder bar, 188) as the heat generated during the friction stir welding is to achieve a composite joint by soldering (soldering).

In this case, the configuration in which the neighboring main protrusion 140 is compositely bonded by friction stir welding and soldering is the same as the configuration in which the neighboring sub-projection portion 120 is compositely bonded by friction stir welding and soldering.

Here, the neighboring main protrusions 140 refer to the main protrusions 140 corresponding to each other in different subdivided beams 160, and the neighboring sub-projections 120 correspond to each other in the different large split beams 150. It means the sub-projection unit 120 to be.

In addition, it is preferable that each of the small split beams 160 has a reinforcing member 162 formed therein to improve strength. The reinforcing member 162 may be applied in various shapes, and is preferably molded integrally with the small split beam 160.

In particular, each of the small split beams 160 is preferably formed in a rectangular shape so as to facilitate the joining of the edges adjacent to each other and increase the stress and strength.

Meanwhile, referring to FIGS. 6 to 9 and 2, a method of manufacturing a cross beam according to an embodiment of the present invention may include a small split beam forming step S10, a first bonding step S20, and a second bonding step ( S30).

In the small split beam forming step S10, the main split part 140 is formed on one side, in particular, on both sides of the upper surface, and the sub split part 120 is formed on any one of both sides adjacent to each of the main protrusions 140. This is a step of forming a plurality of 160 pieces.

At this time, the forming position of the sub-projection part 120 is different depending on the position of the one of the small sub-beams 160 in contact with the sub-projection part 120 of the other small-division beam 160.

In addition, the first bonding step S20 is a process of forming a plurality of large split beams 150 in which the horizontal hollow portions 130 are formed by contacting the main protrusion 140 of the neighboring small split beams 160.

Here, the first bonding step S20 includes a first work preparation step S22, a first solder bar interposing step S24, and a first composite bonding step S26.

The first work preparation step S22 is a process of positioning the main protrusions 140 opposed to each other in the small split beams 160.

In this case, as shown in FIG. 7, each of the small split beams 160 waiting to be bonded is fixedly supported on a horizontal work bench (not shown). At this time, each of the small split beams 160 are arranged in a divided state such that the main protrusion 140 of one of the small split beams 160 faces the main protrusion 140 of the other small split beam 160 in a straight line. Is preferred.

Each of the small split beams 160 comes into contact with the main protrusion 140.

In addition, the first solder bar interposing step S24 is a process of interposing a solder bar 188 between the main stone parts 140 that contact each other to form a joint part.

The solder bar 188 is bonded to and fixed to at least one of the main protrusions 140 of the pair of main protrusions 140 facing the flux 189.

In addition, the first composite bonding step (S26) is inserted into the upper side between the pair of main protrusions 140 to be bonded to the stirring pin 186 of the friction stir welding tool 182 to be rotated, while being delivered It is a process of soldering the lower side between the main protrusions 140 with the solder bar 188 melted by heat.

Details of the pair of main protrusions 140 facing each other with friction stir welding are replaced with those described above.

Accordingly, the joints of the small split beams 160 are joined by one integrated process of friction stir welding and soldering to have excellent bonding characteristics.

On the other hand, the second bonding step (S30) is a step of bonding a pair of large split beams 150 formed by bonding a pair of small split beams 160 with each other. That is, the second bonding step S30 is a process of forming the vertical hollow portion 110 by contacting the sub-projection portion 120 of the adjacent large split beam 150.

The crossbeam 100 is a product that is completed after performing the second bonding step S30.

Here, the second bonding step (S30) is a process of bonding the large split beams 150 to each other through the same process as the first bonding step (S20), the second work preparation step (S32), the second solder bar interposing step ( S34) and the second complex bonding step (S36).

The second operation preparation step S32 is a process of positioning the sub-projections 120 facing each other with the large split beams 150.

At this time, as shown in FIG. 9, the divided beams 160, which have been divided and formed, are waited for joining in a horizontal workbench while being rotated 90 degrees to face the sub-projections 120.

Each of the large split beams 150 comes into contact with the sub-projection unit 120.

In addition, the second solder bar intervening step S34 is a process of interposing a solder bar 188 under the sub-projection unit 120 contacting each other to form a joint.

The solder bar 188 is bonded to and temporarily fixed to at least one of the sub-projections 120 of the pair of sub-projections 120 facing by the flux 189.

In addition, the second composite bonding step (S36) is transmitted while inserting the stirring pin 186 of the rotating friction stir welding tool 182 to the upper side between the pair of sub-projections 120 to be bonded, while being stirred, It is a process of soldering the lower side between the sub-protrusions 120 with the solder bar 188 melted by heat.

Details of the pair of opposing sub-projections 120 soldered with friction stir welding are replaced with those described above.

Accordingly, the joints of the large split beams 150 are joined by one integrated process of friction stir welding and soldering to have excellent bonding characteristics.

As a result, even if the cross beam 100 according to the present invention requires a cross-sectional area of various sizes depending on the length or the weight of the conveyed material, the number or the large number of combinations of the small split beam 160 having the same shape or the minimum number of shapes. By controlling the size of the cross-sectional area by the number of coupling of the beam 150, the number of extrusion molds required for manufacturing can be significantly reduced, thereby reducing the manufacturing cost.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. I will understand. Therefore, the true technical protection scope of the present invention will be defined by the claims below.

1 is a perspective view of a crossbeam divided into split beams according to an exemplary embodiment of the present invention.

2 is a front view of a cross beam in which split beams are bonded to each other according to an embodiment of the present invention.

3 is a sectional view showing the main parts of a state in which the split beams are bonded to each other according to an embodiment of the present invention.

Figure 4 is a cross-sectional view showing the main portion showing a state in which the composite beams are bonded to each other according to an embodiment of the present invention.

5 is a cross-sectional view of a solder bar sandwiched between split beams according to an embodiment of the present invention.

6 is a flowchart illustrating a sequence in which split beams are compositely bonded according to an embodiment of the present invention.

7 to 9 are state diagrams illustrating a forming process of a cross beam according to a sequence in which split beams are compositely bonded according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

100: cross beam 110: vertical hollow portion

120: sub-projection 130: horizontal hollow portion

140: main stone 150: large split beam

160: small split beam 162: reinforcing member

170: junction portion 172: stirring zone portion

174: heat affected zone portion 176: soldering portion

182: friction stir welding tool 184: shoulder

186: stirring pin 188: solder bar

189 flux

Claims (9)

In a crossbeam supporting a load of a conveyed material, The cross beam may include a vertical hollow portion communicating in both sides along an axial direction and having a rectangular hole shape in a vertical direction; And It is formed on both sides with respect to the vertical hollow portion, and communicated to both sides along the axial direction, and comprises a horizontal hollow portion having a rectangular hole shape in the horizontal direction, The cross beam is divided into a large split beam divided on the basis of the longitudinal center axis of the vertical hollow portion, and secondly joins the opposing side edges of the large split beams to form a joint portion, The large split beam is divided into small split beams divided based on the horizontal center axis of the horizontal hollow portion, and primarily joins the opposing side edges of the small split beams to form a joint portion. The joint portion is formed by friction stir welding. delete delete delete The method of claim 1, The portion where the large split beams are opposed to each other and the portion where the small split beams are butted are inserted into a stirring pin of a friction stir welding tool on an upper side thereof, and a cross beam is provided on a lower side through which heat is transferred. The method of claim 5, The solder bar is cross beam, characterized in that to form a flux on the peripheral surface. A small split beam forming step of forming a plurality of main split parts on both sides of an upper surface, and forming a plurality of small split beams forming a sub protrusion part on one side of the side adjacent to each of the main stone parts; A first joining step of forming a plurality of large split beams having a horizontal hollow portion in contact with a main stone part of the adjacent small split beams; And And a second joining step of forming a cross beam in which a longitudinal hollow portion is formed by contacting a sub-projection portion of the adjacent large split beam, After the small split beams are in contact with each other to form the large split beams in a state where the horizontal hollow portions are first formed, the large split beams are in contact with each other to form the cross beams in a state in which the longitudinal hollow portions are secondarily formed. , The first bonding step is a solder bar which is melted by the heat transmitted while inserting the stirring pin of the rotating friction stir welding tool on the upper side between the main protrusions, and soldering the lower side between the main protrusions. Method of producing a crossbeam, characterized in that it comprises a complex bonding step. The method of claim 7, wherein the first bonding step, A first work preparation step of facing the main stone parts; And And a first solder bar interposing step of interposing the solder bar on the lower side between the main protrusions. The method of claim 7 or 8, wherein the second bonding step, A second operation preparation step of facing the sub-projections; A second solder bar interposing step of interposing a solder bar between the sub-projections; And And a second composite bonding step of soldering the lower side between the sub-projections with the solder bar melted by the transferred heat while inserting the stirring pin of the rotating friction stir welding tool on the upper side between the sub-projections. Method for producing a crossbeam, characterized in that.

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