JP4650909B2 - Friction welding method of honeycomb panel - Google Patents

Description

  The present invention relates to a honeycomb panel friction joining method for joining a brazed aluminum panel made of aluminum, which is used to reduce the weight of various equipment, particularly transportation equipment, into a large structure.

  Reducing the weight of various equipment, especially the weight of transport equipment, has been actively promoted in order to reduce the amount of fuel used and lead directly to environmental protection. The use of aluminum and its alloy materials for various equipment has been promoted. It is increasing. Aluminum and its alloy material are lightweight and have an optimal cross-sectional shape, such as a two-sided structure, which can increase rigidity and is excellent in smoothness, so that it can be used as a member for transportation equipment such as vehicles and ships. Is preferred.

  Although the two-sided structure includes a hollow extruded shape and a honeycomb panel, the hollow extruded shape is produced by extruding an aluminum alloy, so that the width of the shapeable shape is limited. On the other hand, in the honeycomb panel, a frame material is arranged at the peripheral edge of the honeycomb core of the core material, face plates are arranged on the upper and lower surfaces of the honeycomb core, and put into a brazing furnace in this state, and these are brazed and integrated. Therefore, the width of the honeycomb panel that can be manufactured is limited by the size of the brazing furnace.

  Therefore, when manufacturing a large structure, it is essential to join a hollow extruded shape member or a honeycomb panel. Conventionally, arc welding (TIG, MIG) is applied to the joining from the viewpoint of strength, but there is a problem that the aluminum alloy material is deformed due to thermal strain during welding. It is necessary to delete the surplus formed at the time of arc welding at a part where the appearance is important. Furthermore, the strength is lowered due to the heat effect around the welded portion due to the great heat input during welding, and the structure must be designed to be thick accordingly, reducing the lightening effect of the corners.

  6000 series (Al-Mg-Si series) aluminum alloy extruded shapes are most often used for vehicle structures, but with ordinary 6000 series aluminum alloys, welding heat is increased by heat input during arc welding. The affected part (HAZ) is softened and the strength of the original aluminum alloy extruded shape is greatly impaired. In addition, defects such as the occurrence of blow holes and solidification cracks peculiar to arc welding may occur, and the welded part is reworked and re-welded, which requires a great deal of man-hours and the appearance of the welded part also deteriorates. There are also difficulties.

As a joining method with less heat input and less softening and distortion, a method of butt-friction joining of aluminum and its alloy shape has been proposed. (See Patent Document 1) According to this method, when hollow extruded shapes or honeycomb panels are joined together, deformation of the joined portions is suppressed, and good joining can be obtained in a short time. In the honeycomb panel, the frame material and face plate at the end of the honeycomb panel assembled by brazing are butted together, and friction bonding is performed along the butted surface, whereby a large honeycomb panel can be manufactured by this method.
Japanese Patent Laid-Open No. 9-309164

  Various disadvantages caused by conventional arc welding can be eliminated by joining two-sided structures made of aluminum and its alloys by friction bonding. For example, when honeycomb panels after brazing are butted together In some cases, a gap may be formed, and if the friction bonding is performed as it is, a crack or a tunnel-like hole is generated, and the bonding quality is remarkably deteriorated.

  The cause of the gap is presumably because the frame material is bent due to thermal stress during brazing heating and cooling, and warpage occurs at the end face of the honeycomb panel. This is thought to occur. Furthermore, a strong oxide film is formed on the surface of the aluminum material by brazing, and the oxide film may remain in the joint portion and cause cracks during friction welding.

The present invention relates to the above-described conventional method in which the frame material of the honeycomb panel is a channel, and the frame material of the brazed honeycomb panel in which the concave portion side of the channel faces outward in friction bonding of the brazed honeycomb panel . The purpose was to eliminate the problems, and the purpose was to minimize the gaps that occur when the honeycomb panels after brazing were put together, to remove brazing dripping and strong oxide film, and to improve the bonding quality. An object of the present invention is to provide a method for friction bonding of honeycomb panels, which is capable of obtaining good and excellent finished friction bonding.

In order to achieve the above object, the honeycomb panel friction bonding method according to claim 1 is a method of friction bonding the honeycomb panels after brazing, wherein the frame material of the honeycomb panel is a channel, and the recess side of the channel is outside. Write to be those joining the frame member to each other brazing honeycomb panel facing, in advance scalping the joint surface of the frame member of the honeycomb panel while flat, and removing deposits . In this configuration, the joint surface of the frame member is chamfered to reduce the amount of gaps, and at the same time, deposits on the joint surface can be removed, so that a good friction joint can be achieved. Further, in this configuration, the chamfering becomes the side edge of the face plate and the side edge of the side plate of the channel, and two places can be friction-joined simultaneously after the butting .

According to a second aspect of the present invention, there is provided the method for friction bonding of honeycomb panels according to the first aspect, wherein the joining surface of the frame member is chamfered until the unevenness is at least within 0.5 mm per 1 m of the joining surface length. . In this configuration, when the joining surfaces of the frame members are brought into contact with each other, the unevenness is at least 0.5 mm per 1 m of the joining surface length. it can.

  According to the first aspect of the present invention, by chamfering the joint surface of the frame material, the gap amount can be reduced, and at the same time, the deposits on the joint surface can be removed. Therefore, there is no gap generated when the honeycomb panels after brazing are brought together, and the drooping of the brazing and the strong oxide film are removed. As a result, it is possible to obtain a friction joint with good joining quality and good finish. Therefore, large structures can be manufactured with less man-hours, and the cost can be reduced. Further, the chamfering becomes the side edge of the face plate and the side edge of the side plate of the channel, and the friction welding at two places after the butting can be performed simultaneously. Therefore, in addition to the above effects, the two face plates can be friction-bonded at the same time, so the number of man-hours can be reduced.

According to the second aspect of the present invention, when the joining surfaces of the frame members are brought into contact with each other, the unevenness is at least within 0.5 mm per 1 m of the joining surface length, and since there are few gaps, good friction joining can be performed. Therefore, in addition to the above effects, it is possible to eliminate unnecessary chamfering and deficiency of the chamfering amount.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail based on FIGS .
FIG. 1 is a perspective view showing a form of a honeycomb panel for applying friction bonding, and FIG. 2 is a cross-sectional view showing a manufacturing state of the honeycomb panel. 1 and 2, the honeycomb panel 1 has a frame material 4 disposed on a peripheral portion 3 of a honeycomb core 2 as a core material, and face plates 5 and 5 are disposed on the upper and lower surfaces of the honeycomb core 2. It is brazed together.

  That is, in the case of the aluminum brazed honeycomb panel 1, a frame material 4 made of an extruded aluminum material at the peripheral edge portion 3 of the honeycomb core 2 formed of an aluminum foil (including an aluminum alloy, the same applies hereinafter) or a thin plate. The face plates 5 and 5 made of an aluminum brazing sheet are placed on the upper and lower surfaces P of the honeycomb core 2 so as to overlap the honeycomb core 2 and the frame material 4, and these are fixed integrally with a jig. It is carried out by putting it in a brazing furnace and brazing and integrating the honeycomb core 2 and the face plates 5 and 5 and the frame material 4 and the face plates 5 and 5 together. The honeycomb core 2 and the frame member 4 are also brazed by the brazing fluid flowing from the honeycomb core 2 and the face plates 5 and 5.

  In the honeycomb panel 1 configured as described above, when the brazing heating and cooling are performed, the frame member 4 bends due to thermal stress and warpage occurs, or, as shown in FIG. 3, the frame member 4 and the face plates 5 and 5 The level | step difference 10 arises between them, and the joining surface 11 at the time of joining the honeycomb panels 1 is a shape with an unevenness | corrugation. Further, as shown in FIG. 4, the joint surface 11 has a solder sag 12 that flows during brazing, and the surface thereof is usually covered with a strong oxide film. Even if the joining surfaces 11 of the honeycomb panel 1 in such a state are brought into contact with each other, a gap is formed, and even if friction joining is performed, a strong oxide film remains and causes cracks. As shown in FIG. 2, the surface is chamfered to eliminate the gap, and the dripping 12 and the strong oxide film are removed.

  The degree of chamfering is ideal when the joining surfaces 11 of the honeycomb panel 1 are abutted to each other and there is no gap at all. However, when the joining surfaces 11 of the honeycomb panel 1 are abutted and frictionally joined to each other, As shown in FIG. 5, the length α of the joint surface 11 needs to be chamfered so that the unevenness per 1 m is at least within 0.5 mm. The irregularity within 0.5 mm is based on many experiments, and if it is within this range, there will be no hindrance to friction welding. If the unevenness exceeds 0.5 mm, there is a high possibility that the friction welding will be hindered.

  As shown in FIG. 6, the face-cut honeycomb panel 1 is brought into contact with each other and bonded to each other by a jig (not shown). Friction welding is performed by rotating the hard pin 14 of the friction welding tool 13 at a high speed along the joining line, inserting it into one end of the joining surface 11 and moving it to the other end along the joining line. Thereafter, when the honeycomb panels 1 are turned upside down and frictionally bonded in the same manner, the honeycomb panels 1 can be bonded to each other by the bonding portion 15 as shown in FIG.

FIG. 8 shows an embodiment of the present invention based on the above technical aspect, in which a channel 21 is applied as a frame material in place of the rectangular tubular frame material 4, and the concave portion 22 side of the channel 21 faces outward. 1 shows a friction joining method of the honeycomb panel 1b . That is, the channel 21 is provided with the side plates 24 and 24 at both ends of the back plate 23. Therefore, the chamfering becomes the side end of the face plate 5 and the side end of the side plate 24 of the channel 21, and the friction welding tool 13a shown in the drawing is used. Then, the two joints can be friction-joined at the same time after the butting.

That is, the friction welding tool 13a has disks 26 and 27 at both ends of a pin 25 having a length l ₁ (t ₁ ≈l ₁ ) that is substantially the same as the thickness t ₁ of the face plate 5 and the side plate 24 of the channel 21. The pincushion joint 28 is fixed substantially in parallel, and a pincushion joint 30 having the same configuration is attached via a shaft 29. The distance L ₁ between the pincushion joints 28 and 30 is equal to the distance L ₂ between the two joints.

If the friction welding tool 13a having the above configuration is used, as shown in FIG. 9 , a backing jig is not required, and the pincushion type bonding portions 28 and 30 follow the honeycomb panels 1a and 1a and there is no axial vibration. Thus, it is possible to simultaneously friction-join the two joining portions of the honeycomb panel 1a. Accordingly, the honeycomb panels 1b can be joined to each other by a single operation, and the pre-joining setup and post-joining treatment can be performed once.

Hereinafter, an embodiment and a comparative embodiment for confirming the effect of the prerequisite technology of the present invention will be described.
Embodiment having the cross-sectional shape shown in FIG. 3, the thickness of the face plate (material: 6N01) is 2.5 mm, the thickness of the frame material (material: 6063) is 5 mm, the width is 40 mm, the panel height is 100 mm, and the panel length is 3000 mm (joining) The joining surface of the honeycomb panel after brazing with a length of 0.3 mm and a honeycomb core (material: 6N01) having a thickness of 0.3 mm and a cell size of 30 mm was shaved up to 1.5 mm. In addition, the bending of the panel length of 3000 mm of the honeycomb panel after brazing was 1.3 mm at the maximum (this measurement was performed by fixing the base material on a surface plate and measuring the chamfered surface with a needle-type shape measuring device. This was done by scanning over the entire length and recording the irregularities.)

  When the joining surfaces of the two honeycomb panels are butted and restrained under pressure, the gap between the joining surfaces becomes 0.5 mm or less. In this state, the pin has a diameter of 5.0 mm and a length of 4.5 mm, and the disk has a diameter of A 10 mm friction welding tool was rotated at 1000 rpm and moved along the welding line at a feed rate of 300 mm / min for friction welding. Subsequently, the other side was friction-joined in the same way upside down. As a result, it was confirmed that the joint had no defects such as errors due to friction welding, no defects on the surface, and no internal defects in the transmission X-ray inspection.

Comparison form
The joint surface of the honeycomb panel after brazing obtained in the above embodiment was butted and restrained by pressure, and the maximum gap between the joint surfaces at that time was 2.2 mm. Friction welding was performed under the same conditions as in the previous embodiment without chamfering in this state. As a result, it was confirmed that a groove-like defect was intermittently observed in the joint part, and a tunnel-like defect was generated due to a lack of metal in the joint part even in a part having no surface defect.

It is a perspective view which shows the form of the honeycomb panel for applying a friction joining . It is sectional drawing which shows the manufacture state of a honeycomb panel. It is sectional drawing which shows the aspect of the friction welding of the honeycomb panel used as the premise of this invention. It is a side view which shows the honeycomb panel after brazing . It is a top view which shows the aspect of the friction welding of the honeycomb panel used as the premise of this invention. It is sectional drawing which shows the aspect of the friction welding of the honeycomb panel used as the premise of this invention. It is sectional drawing which shows the honeycomb panel produced by the friction joining shown in FIG. It is sectional drawing which shows embodiment of the friction bonding method of the honeycomb panel of this invention. It is a perspective view which shows the honeycomb panel of the manufacture state by the other method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a, 1b Honeycomb panel 2 Honeycomb core 3 Peripheral part 4 Frame material 5 Face plate 10 Level | step difference 11 Joining surface 12 Dripping 13, 13a Friction welding tool 14 Pin 15 Joining part 16 Joining surface board 21 Channel 22 Recessed part 23 Back board 24 Side board 25 Pin 26, 27 Disc 28, 30 Pincushion joint 29 axis

Claims (2)

A method of friction joining the honeycomb panels with each other after brazing, a frame member of the honeycomb panel channel, there is a recess side of the channel joining the frame member to each other brazing honeycomb panel facing outward A method of friction bonding a honeycomb panel, characterized in that a bonding surface of a frame material of the honeycomb panel is previously chamfered and flattened, and deposits are removed. 2. The method of claim 1, wherein the joining surface of the frame material is chamfered until the irregularities are at least 0.5 mm per 1 m of the joining surface length.

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