JP2017078490A - Clamp and joining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily define a temperature of each part of a joined member when heating and joining the joined member by induction heating.SOLUTION: In order to join an inner frame 11 and an outer frame 12, the frames 11, 12 are heated by induction in a form that a magnetic flux line is made to penetrate in a direction in which the frames 11, 12 are aligned in a state that a hot melt adhesive 13 is sandwiched between the frames 11, 12. At the induction heating, the inner frame 11 and the outer frame 12 sandwich the hot melt adhesive 13 by a clamp 30 in a state of being pressed against the hot melt adhesive. A pair of mouthpieces 31A, 32A being portions for sandwiching the inner frame 11 and the outer frame 12 are composed of a heat transmission suppression part 34 having a shape in which one portion suppresses heat transmission to the outer frame 12 compared with the other portion.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a clamp that holds a member to be joined in a state in which a hot melt adhesive is sandwiched during joining using induction heating, and a joining method using the clamp.

  A hot melt adhesive may be used when joining members to be joined such as a vehicle frame. In this joining, first, a hot melt adhesive is sandwiched between two members to be joined. Thereafter, the two members to be joined are sandwiched between the hot melt adhesives by a clamp as described in Patent Document 1. Then, after the member to be joined is heated for a predetermined time in that state, the heating is stopped. At this time, the hot melt adhesive sandwiched between the members to be bonded is once melted and then solidified, whereby the two bonded portions are bonded (bonded).

Japanese Utility Model Publication No.59-127089

  When joining a member to be joined in the above-described manner, it is conceivable to heat the member to be joined (specifically, a hot melt adhesive) by induction heating using an electromagnetic coil. In this induction heating, for example, a magnetic flux is generated in an electromagnetic coil in such a manner that magnetic flux lines penetrate through the members to be joined in the direction in which the two members to be joined are arranged. The surface of the member to be joined is heated by the magnetic flux generated by the electromagnetic coil.

  Here, due to the characteristics of the electromagnetic coil, the range in which the magnetic flux is generated can be determined by setting the shape of the electromagnetic coil, but it is difficult to individually determine the magnetic flux density in each part within the same range. Therefore, when heating the member to be joined by induction heating, it is difficult to finely control the temperature of each part of the member to be joined. There is a possibility that deformation of the member to be bonded may occur, or the temperature of a part of the hot melt adhesive cannot be sufficiently increased, resulting in a decrease in bonding strength of the member to be bonded.

  The present invention has been made in view of such circumstances, and the purpose thereof is a clamp that can easily determine the temperature of each part of the bonded member when the bonded member is heated and bonded by induction heating, And providing a suitable joining method using the clamp.

  The clamp for solving the above-described problem is a magnetic flux line in a direction in which the two members to be joined are arranged in a state where a hot melt adhesive is sandwiched between the two members to be joined to join the two members to be joined. A clamp for sandwiching the two members to be joined against the hot melt adhesive when heating the members to be joined by performing induction heating in a mode of passing through the two members; A part of the pair of caps that sandwich the portion is composed of a heat transfer suppressing portion having a shape that suppresses heat transfer to the member to be joined as compared with other portions.

  By performing induction heating in such a manner that the magnetic flux lines are penetrated in the direction in which the two members to be joined are arranged using the clamp, the two members to be joined and the die sandwiching the members to be joined are heated. It becomes like this. And since a part of nozzle | cap | die is a shape in which the heat transfer to a to-be-joined member is suppressed, the heat transfer from a nozzle | cap | die to a to-be-joined member can be suppressed in the arbitrary parts of a to-be-joined member. Accordingly, during induction heating, heat transfer from the base to the member to be bonded can be suppressed in any part of the member to be bonded while being suppressed in other parts without being suppressed. The temperature of each part can be finely managed. As described above, according to the clamp described above, the member to be joined is induced by induction heating through an easy setting operation such as setting the shape of the die so that heat transfer from the die to the adjacent member to be joined is partially suppressed. The temperature of each part of the to-be-joined member when heated and joined can be easily determined.

In the clamp, it is preferable that the heat transfer suppressing portion is a portion where the thickness of the base in a direction in which the member to be joined is sandwiched is partially thick.
In induction heating using the clamp, first, the temperature of the surface of the base of the clamp (specifically, the surface opposite to the surface [contact surface] contacting the member to be joined) is increased. And the to-be-joined member is heated by transferring the heat of this surface to the said contact surface in a nozzle | cap | die, and being transmitted to the to-be-joined member from the same contact surface. From this, it can be said that as the thickness of the clamp base increases, the time required for the heat generated on the surface of the base during induction heating to be transmitted to the contact surface increases, and the heat is less likely to be transmitted to the member to be joined. .

  According to the above clamp, since the part where the thickness of the base is partially thickened is used as the heat transfer suppression part, the heat transfer from the base in the heat transfer suppression part to the member to be joined is performed from the base in the other part. It can suppress compared with the heat transfer to a to-be-joined member.

In the clamp, it is preferable that the heat transfer suppressing portion is a through-hole that extends in a direction in which the member to be bonded is sandwiched in the base.
In the portion where the through-hole is formed in the base, since the base and the member to be joined do not come into contact with each other, heat transfer from the base to the member to be joined is hardly performed. According to the clamp, since the through-hole formed in the base is used as the heat transfer suppressing portion, heat transfer from the base to the bonded member in the heat transfer suppressing portion is transferred from the base in the other portion to the bonded member. It can be suppressed compared to heat transfer.

In the clamp, it is preferable that the heat transfer suppressing portion is a portion having a shape in which an edge of the base in a direction along a surface sandwiching the member to be bonded is cut out.
In the part where the edge is cut out in the base, the base and the member to be joined do not come into contact with each other, so that heat is hardly transferred from the base to the member to be joined. According to the above clamp, since the portion where the edge of the base is cut out is used as the heat transfer suppression portion, the heat transfer from the base to the member to be bonded in the heat transfer suppression portion is connected from the base in the other portion to be bonded. It can suppress compared with the heat transfer to a member.

  A joining method for solving the above-described problem is a joining method for joining two members to be joined by a hot melt adhesive, and includes a first step of sandwiching the hot melt adhesive between the two members to be joined. A second step of sandwiching the two members to be joined by a pair of clamps in a state of being pressed against the hot melt adhesive, and a state in which the two members to be joined are sandwiched by the pair of die. A third step of performing induction heating in such a manner that magnetic flux lines are penetrated in a direction in which one member to be joined and the pair of bases are arranged, and as the clamp, a part of the base is compared with other parts of the base And what consists of a heat-transfer suppression part of the shape which suppresses the heat transfer to the said to-be-joined member is used.

  According to the above-described bonding method, since induction heating is performed in such a manner that the magnetic flux lines are penetrated in the direction in which the two members to be bonded are arranged, two members to be bonded and a clamp base sandwiching the members to be bonded And become heated. And since a part of clamp | cap | die of a clamp is a shape which can suppress the heat transfer to a to-be-joined member, the heat transfer from a nozzle | cap | die to a to-be-joined member can be suppressed in the arbitrary parts of a to-be-joined member. Accordingly, during induction heating, heat transfer from the base to the member to be bonded can be suppressed in any part of the member to be bonded while being suppressed in other parts without being suppressed. The temperature of each part can be finely managed. As described above, according to the above-described joining method, the member to be joined by induction heating through an easy setting operation such as setting the shape of the die so that heat transfer from the die to the adjacent member to be joined is partially suppressed. It is possible to easily determine the temperature of each part of the member to be joined when joining by heating.

In the above-described joining method, it is preferable to use a clamp in which the thickness of the base in the direction in which the member to be joined is sandwiched is partially increased to form the heat transfer suppressing portion.
In the induction heating, first, the temperature of the surface of the clamp base (specifically, the surface opposite to the surface [contact surface] contacting the member to be joined) is increased. And the to-be-joined member is heated by transferring the heat of this surface to the said contact surface in a nozzle | cap | die, and being transmitted to the to-be-joined member from the same contact surface. From this, it can be said that the thicker the base is, the longer it takes for the heat generated on the surface of the base to be transmitted to the contact surface during induction heating, and it is difficult to transmit the heat to the member to be joined.

  According to the above-mentioned joining method, since the clamp has the heat transfer suppression part which is a part where the thickness of the base is partially thickened, the heat transfer from the base in the heat transfer suppression part to the member to be joined is performed. This can be suppressed compared to heat transfer from the base to the member to be joined in other portions.

  In the above-described joining method, it is preferable to use, as the clamp, a portion in which a through-hole extending in a direction of sandwiching the member to be joined is formed in the base as the heat transfer suppressing portion.

  In the portion where the through hole is formed in the base of the clamp, the base and the member to be joined do not come into contact with each other, so that heat transfer from the base to the member to be joined is hardly performed. According to the above joining method, since the clamp base has a through hole, the heat transfer from the base to the member to be joined in the part where the through hole is formed (heat transfer suppression part) The heat transfer from the base to the member to be joined can be suppressed.

  In the above-described joining method, it is preferable to use a clamp in which the portion where the edge of the base is cut out in the direction along the surface sandwiching the member to be joined is used as the heat transfer suppressing portion.

  In the portion of the clamp base where the edge is notched, the base and the member to be joined do not come into contact with each other, so that heat transfer from the base to the member to be joined is hardly performed. According to the above-mentioned joining method, since the clamp has the heat transfer suppression portion which is a portion where the edge of the base is cut out, heat transfer from the base to the member to be joined in this heat transfer suppression portion This can be suppressed compared to heat transfer from the base to the member to be joined.

  In the above-described joining method, it is preferable to use a clamp in which a part extending away from the joined member is used as the heat transfer suppressing portion in a state where the joined member is sandwiched between the pair of caps. .

  If a part of the base is formed so as to extend away from the member to be joined in a state where the member to be joined is sandwiched between the pair of bases, the base and the member to be joined do not contact at the part (separated part) that extends away from the part. In addition, little heat is transferred from the base to the member to be joined. According to the above-described joining method, the clamp having the heat transfer suppression portion which is such a separated portion is used. Therefore, heat transfer from the base to the member to be joined in the heat transfer suppression portion is performed from the base in the other portion to the member to be joined. Compared with heat transfer to

  In the above-mentioned joining method, as the clamp, at least one of the pair of caps is made of a material having a shallower current penetration depth than a material for forming the two joined members sandwiched between the two joined members. Is preferably used.

  In the induction heating, the temperature of the heating object is more likely to increase as the forming material of the heating object (member to be joined or the base) has a shallower current penetration depth. In the above-described joining method, the temperature of the member made of a material having a deep current penetration depth does not increase so much during induction heating, and the temperature of the die made of a material having a relatively shallow current penetration depth greatly increases. . Therefore, if the amount of heat transmitted from each part of the clamp base to the member to be joined can be set finely, the temperature of each part of the member to be joined can be set finely.

  According to the above-mentioned joining method, since the amount of heat transferred from each part of the base to the member to be joined can be set finely by providing the heat transfer suppressing part in the base of the clamp, the member to be joined is heated by induction heating. The temperature of each part of the member to be joined when joining can be determined finely.

  ADVANTAGE OF THE INVENTION According to this invention, the temperature of each part of the said to-be-joined member when heating and joining a to-be-joined member by induction heating can be defined easily.

The side view which shows the inner frame and outer frame of the state which pinched | interposed the hot-melt-adhesive agent in 1st Embodiment. BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows schematic structure of the joining apparatus of 1st Embodiment. The top view of the clamp of the state which pinched | interposed the inner frame and the outer frame in 1st Embodiment. Sectional drawing along line 4-4 in FIG. (A) is a top view which shows the inner frame and outer frame of the state which pinched | interposed the hot-melt-adhesive agent in 2nd Embodiment, (b) is the side view seen from the arrow 5B direction in (a). The top view of the clamp of the state which pinched | interposed the inner frame and the outer frame in 2nd Embodiment. The side view of the nozzle | cap | die and its periphery seen from the arrow 7 direction in FIG. Sectional drawing along line 8-8 in FIG. Sectional drawing along line 9-9 in FIG. Sectional drawing of the clamp of the state which pinched | interposed the inner frame and the outer frame in other embodiment. Sectional drawing of the clamp of the state which pinched | interposed the inner frame and the outer frame in other embodiment. The top view of the nozzle | cap | die of the state which pinched | interposed the inner frame and outer frame in other embodiment, and its periphery.

(First embodiment)
Hereinafter, a first embodiment of a clamping and joining method will be described.
As shown in FIG. 1, in this embodiment, the inner frame 11 and the outer frame 12 are bonded by a hot melt adhesive 13. The inner frame 11 and the outer frame 12 constitute a part of the frame of the back door of the vehicle. The inner frame 11 is formed in a rectangular flat plate shape by a resin material (specifically, polypropylene), and the outer frame 12 is formed in a rectangular flat plate shape by a metal material (specifically, an aluminum alloy). Yes. The hot melt adhesive 13 is made of a thermoplastic plastic as a main component. In the present embodiment, the inner frame 11 and the outer frame 12 correspond to two members to be joined.

Hereinafter, an apparatus used for joining the inner frame 11 and the outer frame 12 will be described.
As shown in FIG. 2 and FIG. 3, the joining device 20 includes a clamp that sandwiches the inner frame 11 and the outer frame 12 with the hot melt adhesive 13 sandwiched between them while being pressed against the hot melt adhesive 13. 30.

  The clamp 30 includes a lever 31 formed in an S shape and a lever 32 formed in an inverted S shape. These levers 31 and 32 are pivotally supported so as to be relatively rotatable at an intermediate portion in the extending direction. At the end of one of the levers 31 and 32 (the right side in FIG. 2), there are provided bases 31A and 32A that sandwich the inner frame 11 and the outer frame 12, and the other end (the left side in FIG. 2). The parts are operation parts 31B and 32B for opening and closing the bases 31A and 32A.

  As shown in FIGS. 3 and 4, the base 31 </ b> A has a shape protruding from the tip of the lever 31, and is adjacent to the outer frame 12 in a state where the inner frame 11 and the outer frame 12 are sandwiched between the pair of bases 31 </ b> A and 32 </ b> A. The shape is pressed against the outer frame 12 at a position where the The base 31A has a rectangular cross section in a direction S (vertical direction in FIG. 4) in which the frames 11 and 12 are sandwiched between the pair of bases 31A and 32A. In addition, the base 31A has a shape that the thickness in the sandwiching direction S is thickest in the central portion in the protruding direction P (left and right direction in FIG. 4) of the base 31A from the lever 31 and becomes thinner as it moves away from the central portion. It is.

  As described above, the thickness of the cap 31A in the sandwiching direction S is partially thick at the central portion and the peripheral portion (heat transfer suppressing portion 34) in the protruding direction P. In the present embodiment, the central portion of the base 31 </ b> A in the protruding direction P and its peripheral portion function as a heat transfer suppressing portion 34 having a shape that suppresses heat transfer to the outer frame 12 as compared with other portions.

  The base 32A has a shape protruding from the tip of the lever 32. When the base 32A is sandwiched between the inner frame 11 and the outer frame 12 by the pair of bases 31A and 32A, the base 32A is located on the inner frame 11 at a position adjacent to the inner frame 11. The shape is pressed. The base 32A has a flat plate shape with a rectangular cross section in the sandwiching direction S.

  The base 31A is made of “carbon steel”, and the base 32A is made of “stainless steel”. The two levers 31 and 32 are made of “stainless steel”. In this embodiment, in a state where the inner frame 11 and the outer frame 12 are sandwiched between the clamps 30, the forming material (carbon steel) of the base 31 </ b> A adjacent to the outer frame 12 made of an aluminum alloy is formed on the inner frame 11 made of polypropylene. It is a material having a shallower current penetration depth than the forming material (stainless steel) of the adjacent base 32A. Further, in this embodiment, the forming material (carbon steel) of the base 31A is made of the forming material (aluminum alloy) of the outer frame 12 adjacent to the base 31A in a state where the inner frame 11 and the outer frame 12 are sandwiched by the clamp 30. Is a material with a shallow current penetration depth.

  A spring 33 is attached between the operation units 31B and 32B of the clamp 30 to urge the operation units 31B and 32B in a direction away from each other. Then, by operating the operation portions 31B and 32B of the levers 31 and 32 against the urging force of the spring 33 to bring the operation portions 31B and 32B closer, the pair of bases 31A and 32A move away from each other, and the base 31A , 32A, the inner frame 11 and the outer frame 12 can be inserted. Further, the operation portions 31B and 32B of the levers 31 and 32 are not operated, and the operation portions 31B and 32B of the levers 31 and 32 are separated by the urging force of the spring 33 to bring the pair of bases 31A and 32A closer to each other. As a result, the inner frame 11 and the outer frame 12 can be sandwiched between the caps 31A and 32A.

  As shown in FIG. 2, the bonding apparatus 20 includes an electromagnetic coil 21 for generating a magnetic field and a high-frequency power source 22 that supplies electric power to the electromagnetic coil 21. The electromagnetic coil 21 is arranged at a position (above the caps 31A and 32A in FIG. 2) along with the caps 31A and 32A in the direction in which the caps 31A and 32A are aligned (the vertical direction in FIG. 2). Thereby, when electric power is supplied to the electromagnetic coil 21 to generate magnetic flux, the generated magnetic flux penetrates the caps 31A and 32A in the arrangement direction of the caps 31A and 32A. Further, in this case, if the inner frame 11 and the outer frame 12 are sandwiched between the pair of caps 31A and 32A (the state shown in FIG. 2), the magnetic flux generated by the electromagnetic coil 21 is changed to each frame 11, In the direction in which 12 is arranged, the frames 11 and 12 are penetrated.

  The joining device 20 extends in a shape wound around a portion of the tank 31 in which the cooling water is stored, a pump 24 that pumps the cooling water in the tank 23, and the base 31A of the lever 31 adjacent to the base 31A. It has a cooling water pipe 25 into which the cooling water pumped by the pump 24 is introduced. The cooling water pumped by the pump 24 returns to the tank 23 after passing through the inside of the cooling water pipe 25. At this time, through the heat exchange between the cooling water passing through the inside of the cooling water pipe 25 and the lever 31, the lever 31 (specifically, the portion adjacent to the base 31A made of carbon steel having a shallow current penetration depth) is cooled. .

Hereinafter, a method of joining the inner frame 11 and the outer frame 12 using the joining device 20 will be described.
<First step>
First, in the first step, as shown in FIG. 1, a sheet-like hot melt adhesive 13 is sandwiched between the inner frame 11 and the outer frame 12.

<Second step>
In the subsequent second step, as shown in FIG. 2, the inner frame 11 and the outer frame 12 with the hot melt adhesive 13 sandwiched therebetween are sandwiched between the pair of caps 31 </ b> A and 32 </ b> A. As a result, the inner frame 11 and the outer frame 12 are sandwiched between the pair of caps 31A and 32A of the clamp 30 while being pressed against the hot melt adhesive 13.

<Third step>
In the subsequent third step, power is supplied from the high-frequency power source 22 to the electromagnetic coil 21 for a predetermined time. When power is supplied to the electromagnetic coil 21, the base 31A made of carbon steel, the outer frame 12 made of aluminum alloy, and the base 32A made of stainless steel are heated and heated by the magnetic flux generated by the electromagnetic coil 21. As a result, the inner frame 11 and the outer frame 12 are heated while being sandwiched between the caps 31 </ b> A and 32 </ b> A of the clamp 30. The hot melt adhesive 13 sandwiched between the frames 11 and 12 is heated and melted by heat transfer from the inner frame 11 and the outer frame 12. Thereafter, when power supply to the electromagnetic coil 21 is stopped, the hot melt adhesive 13 once melted is cooled and solidified, whereby the inner frame 11 and the outer frame 12 are bonded (joined).

  In the third step, the pump 24 is operated to pump the cooling water. Thereby, since cooling water flows through the cooling water pipe 25, a portion of the lever 31 adjacent to the base 31A is cooled.

Hereinafter, the effect by joining the inner frame 11 and the outer frame 12 using the clamp 30 is demonstrated.
As shown in FIG. 4, in induction heating using the clamp 30, first, the surface 35 of the base 31 </ b> A of the clamp 30 (specifically, the surface that contacts the outer frame 12 [surface opposite to the contact surface 36]). The temperature rises. The heat is transmitted to the contact surface 36 through the inside of the base 31A and is transmitted from the contact surface 36 to the outer frame 12, whereby the outer frame 12 is heated. From this, the distance between the surface 35 of the base 31A and the contact surface 36 (distances indicated by L1 and L2 in FIG. 4) increases as the thickness of the base 31A in the sandwiching direction S increases. It can be said that the time required for the heat generated on the surface 35 of the base 31 </ b> A to be transmitted to the contact surface 36 becomes long, and the heat is hardly transmitted to the outer frame 12.

  In the present embodiment, the thickness of the base 31A in the sandwiching direction S is the thickest in the central portion in the protruding direction P, and becomes thinner as the distance from the central portion increases. Therefore, heat transfer from the base 31A to the outer frame 12 at the time of induction heating is suppressed most at the central portion (the thickest part) in the protruding direction P of the base 31A. As the distance from the central portion increases, heat transfer from the base 31A to the outer frame 12 is allowed without being suppressed.

  In the present embodiment, the thickness of each part of the base 31A that allows the temperature of each part of the hot melt adhesive 13 to be an appropriate temperature is obtained in advance based on the results of various experiments by the inventors. The thickness of each part of the base 31A is determined based on the obtained result. In the present embodiment, hot melt is suppressed by suppressing heat transfer to the outer frame 12 from the central portion and the periphery thereof in the protruding direction P of the base 31A as compared to heat transfer to the outer frame 12 from other portions. The temperature of each part of the adhesive 13 becomes uniform. In view of this point, the thickness of the base 31A in the sandwiching direction S is maximized at the central portion in the protruding direction P and is decreased as the distance from the central portion increases.

  Thus, according to the joining method using the clamp 30, an easy setting operation of setting the thickness of each part of the base 31A so that heat transfer from the base 31A to the outer frame 12 is partially suppressed. Through this, the temperature of each part of the outer frame 12 when the frames 11 and 12 are joined by induction heating can be finely managed. In addition, it becomes possible to manage roughly the temperature of each part of the outer frame 12 at the time of induction heating by setting after considering the shape of the electromagnetic coil 21 and the electric power supplied to the electromagnetic coil 21 closely. However, with such a setting method, it is difficult to finely manage the temperature of each part of the outer frame 12.

  According to this embodiment, since each part of the outer frame 12 can be appropriately heated by heat transfer from the base 31A, the entire hot melt adhesive 13 is appropriately heated by heat transfer from the outer frame 12. Can be dissolved. Therefore, the inner frame 11 and the outer frame 12 can be suitably joined with the hot melt adhesive 13.

  In induction heating, as the material for forming the members to be joined (the inner frame 11 and the outer frame 12) is a material having a deeper current penetration depth, it is more difficult to raise the temperature of the members to be joined. In the present embodiment, the outer frame 12 is formed of an aluminum alloy having a deep current penetration depth as compared with carbon steel widely used as a forming material. The inner frame 11 is formed of polypropylene that does not generate heat by induction heating. Therefore, even if the magnetic flux generated by the electromagnetic coil 21 is passed through the inner frame 11 and the outer frame 12 with the hot melt adhesive 13 sandwiched therebetween, the temperature of the inner frame 11 and the outer frame 12 is sufficiently increased. It may not be possible to In this case, the hot melt adhesive 13 cannot be heated appropriately, and the inner frame 11 and the outer frame 12 cannot be appropriately joined by the hot melt adhesive 13.

  According to the present embodiment, although the outer frame 12 is formed of an aluminum alloy having a deep current penetration depth, the outer frame 12 is adjacent to the outer frame 12 with the inner frame 11 and the outer frame 12 sandwiched by the clamp 30. The base 31 </ b> A is made of carbon steel having a shallower current penetration depth than the aluminum alloy. Therefore, in addition to heating the outer frame 12 made of an aluminum alloy by induction heating, the base 31A made of carbon steel having a shallower current penetration depth than the aluminum alloy can be efficiently heated. Since the outer frame 12 can be efficiently heated by the heat transfer from the base 31A, the hot melt adhesive 13 can be heated and melted by the heat transfer from the outer frame 12. The inner frame 11 and the outer frame 12 can be joined by the agent 13.

Thus, according to the joining method using the clamp 30, the inner frame 11 and the outer frame 12 can be joined efficiently using induction heating.
Further, during induction heating using the clamp 30, the temperature of the outer frame 12 made of aluminum alloy does not rise so much, and the temperature of the base 31A made of carbon steel rises greatly. Therefore, if the amount of heat transmitted from each part of the cap 31A of the clamp 30 to the outer frame 12 can be set finely, the temperature of each part of the outer frame 12 can be set finely.

  According to this embodiment, since the amount of heat transmitted from each part of the base 31A to the outer frame 12 can be set finely by setting the thickness in the sandwiching direction S of each part of the base 31A, by induction heating The temperature of each part of the outer frame 12 when the outer frame 12 is heated and joined can be finely determined.

  Here, when the outer frame 12 and the inner frame 11 are joined, the outer frame 12 and the inner frame 11 are heated to a high temperature commensurate with the outer frame 12 made of an aluminum alloy having high heat resistance. In this case, although the temperature of the outer frame 12 can be sufficiently increased to properly heat the hot melt adhesive 13, the inner frame 11 made of polypropylene having low heat resistance is melted and undesirably deformed. There is a fear. Also, the inner frame 11 and the outer frame 12 are heated to a relatively low temperature that matches the inner frame 11 made of polypropylene. In this case, although unnecessary deformation of the inner frame 11 can be suppressed, the temperatures of the inner frame 11 and the outer frame 12 cannot be sufficiently increased, and the inner frame 11 and the outer frame 12 formed by the hot melt adhesive 13 are not used. There is a possibility that it cannot be properly joined.

  In the clamp 30, the base 31 </ b> A adjacent to the outer frame 12 made of an aluminum alloy with the inner frame 11 and the outer frame 12 being sandwiched is formed of carbon steel having a shallow current penetration depth. Therefore, the outer frame 12 can be heated to a sufficiently high temperature by induction heating, and the hot melt adhesive 13 can be appropriately heated by heat transfer from the outer frame 12. At this time, the outer frame 12 is not deformed by melting.

  Moreover, in the clamp 30, the base 32A adjacent to the inner frame 11 made of polypropylene with the inner frame 11 and the outer frame 12 being sandwiched is formed of stainless steel having a deep current penetration depth. Thereby, compared with the outer frame 12 with high heat resistance, the inner frame 11 with low heat resistance can be made difficult to be heated. Therefore, it is possible to exhibit the function of suppressing the unnecessary deformation of the inner frame 11 by making the clamp 30 difficult to heat the inner frame 11 while allowing the clamp 30 to sufficiently heat the outer frame 12.

  In the clamp 30, the base 31A is formed of carbon steel having a shallow current penetration depth. Therefore, when the inner frame 11 and the outer frame 12 are joined by induction heating, the temperature of the base 31A is increased, and the temperature of the entire clamp 30 is increased, which may cause unnecessary deformation. There is. According to this embodiment, when the inner frame 11 and the outer frame 12 are joined by induction heating, the cooling water is pumped by the pump 24, and the portion adjacent to the base 31A of the lever 31 is cooled. Therefore, the temperature increase of the clamp 30 other than the base 31 </ b> A can be suppressed, and a decrease in reliability due to overheating of the clamp 30 can be suppressed.

According to the present embodiment, the following effects can be obtained.
(1) Through an easy setting operation such as setting the thickness of each part of the base 31A, the temperature of each part of the outer frame 12 when the frames 11 and 12 are joined by induction heating can be easily determined. .

  (2) From the forming material (aluminum alloy) of the outer frame 12 adjacent to the base 31A with the inner frame 11 and the outer frame 12 sandwiched between the forming material (carbon steel) of the base 31A of the clamp 30. Also made a material with a shallow current penetration depth. Therefore, by setting the thickness of each part of the base 31A in the sandwiching direction S, the amount of heat transmitted from each part of the base 31A to the outer frame 12 can be set finely, and the outer frame 12 is heated by induction heating. Thus, the temperature of each part of the outer frame 12 when joining can be finely determined.

(Second Embodiment)
Hereinafter, the second embodiment of the clamping and joining method will be described focusing on differences from the first embodiment. In addition, below, the same code | symbol is attached | subjected and shown to the structure same as 1st Embodiment, and the detailed description is omitted.

The present embodiment and the first embodiment differ in the structure of the outer frame and the shape of the clamp base.
First, the structure of the outer frame of this embodiment will be described.

  As shown in FIGS. 5A and 5B, the outer frame 40 has a base portion 41 formed in a substantially rectangular plate shape with a metal material (specifically, an aluminum alloy). The base portion 41 is integrally provided with a first member 43 extending in a circular cross section in the sandwiching direction S (vertical direction in FIG. 5B). The first member 43 is formed of a resin material (specifically, polypropylene), is in the vicinity of one end (upper side in FIG. 5A) of the base portion 41 in the longitudinal direction of the rectangle, and The base portion 41 is provided at a central portion in the rectangular short direction (the protruding direction P [left and right direction in FIG. 5]). Further, the base portion 41 is integrally provided with a second member 44 that extends in a square cross section. The second member 44 is formed of a resin material (specifically, polypropylene), and in the vicinity of the other end (downward in FIG. 5A) of the base 41 in the longitudinal direction of the rectangle, The shape extends from one end to the other end in P (left-right direction in FIG. 5).

Next, the shape of the clamp base of this embodiment will be described.
As shown in FIGS. 6 and 7, one of the pair of caps 51 </ b> A and 32 </ b> A (the cap 51 </ b> A) of the clamp 50 includes a flat plate-shaped first contact portion 52, a flat plate-shaped second contact portion 53, and It has a curved arch portion 54 that connects the first contact portion 52 and the second contact portion 53. The first contact portion 52, the second contact portion 53, and the arch portion 54 are integrally formed.

  The first contact portion 52 has a through-hole 55 (FIG. 6) extending in a circular cross section in the sandwiching direction S. When the inner frame 11 and the outer frame 40 are sandwiched between the pair of caps 51 </ b> A and 32 </ b> A, the first contact portion 52 is pressed against the outer frame 40 so that the inner surface of the through hole 55 surrounds the first member 43. It will be in the state.

  When the inner frame 11 and the outer frame 40 are sandwiched between the pair of caps 51A and 32A, the second contact portion 53 is pressed near the end of one of the rectangular shapes of the outer frame 40 (downward in FIG. 6). It becomes a state.

  The arch portion 54 is entirely in the state where the inner frame 11 and the outer frame 40 are sandwiched between the pair of caps 51A, 32A, and the entire outer frame 40 (specifically, a portion where the second member 44 is disposed and a portion in the vicinity thereof) ) Is curved in a convex shape in one direction (left direction in FIG. 7) so as to extend at a position away from. Further, as shown in FIG. 6, the length of the arch portion 54 in the protruding direction P is shorter than the length of the first contact portion 52 in the protruding direction P and the length of the second contact portion 53 in the protruding direction P. It has become.

In the present embodiment, the through hole 55 and the arch portion 54 in the base 51 </ b> A correspond to a heat transfer suppressing portion having a shape that suppresses heat transfer to the member to be joined.
Hereinafter, the effect by joining the inner frame 11 and the outer frame 40 using the clamp 50 is demonstrated.

By performing induction heating using the clamp 50, the outer frame 40 and the pair of caps 51A and 32A sandwiching the frames 11 and 40 are heated.
As shown in FIG. 8, in the portion where the through hole 55 is formed in the base 51A of the clamp 50, in the state where the frames 11 and 40 are sandwiched between the pair of bases 51A and 32A (state shown in FIG. 8), the same base 51A and the outer frame 40 do not contact. Therefore, almost no heat transfer from the base 51 </ b> A is performed on the portion of the outer frame 40 that faces the through hole 55. Therefore, heat transfer from the base 51 </ b> A to the outer frame 40 through the portion facing the through hole 55 in the outer frame 40 comes into contact with another portion (specifically, the first contact portion 52) in the outer frame 40. Compared with the heat transfer from the base 51A to the outer frame 40 via the part or the part contacting the second contact part 53). As a result, heat transfer to the first member 43 and its surroundings is suppressed, and the temperature rise of the first member 43 is suppressed. Therefore, unnecessary deformation of the first member 43 due to overheating such as the first member 43 melting. Can be avoided.

  Further, as shown in FIG. 9, the arch portion 54 of the base 51A has a shape extending away from the outer frame 40 in a state where the frames 11 and 40 are sandwiched between the pair of bases 51A and 32A. Do not contact with. Therefore, almost no heat transfer from the base 51 </ b> A is performed on the portion of the outer frame 40 that faces the arch portion 54. Therefore, heat transfer from the base 51 </ b> A to the outer frame 40 through the portion facing the arch portion 54 in the outer frame 40 is in contact with another portion (specifically, the first contact portion 52) in the outer frame 40. Compared with the heat transfer from the base 51A to the outer frame 40 via the part or the part contacting the second contact part 53).

  A second member 44 is provided in a portion of the outer frame 40 that faces the arch portion 54. By performing induction heating using the clamp 50, heat transfer to the second member 44 and its surroundings can be suppressed, so that temperature rise of the second member 44 can be suppressed, and the second member 44 can be melted. Such unnecessary deformation of the second member 44 due to overheating can be avoided.

  As described above, according to the present embodiment, heat transfer from the base 51A to the outer frame 40 during induction heating is suppressed at a portion where the temperature increase in the outer frame 40 is to be suppressed, while heating in the outer frame 40 is necessary. In a part, it can tolerate without suppressing. Thereby, the temperature of each part of the outer frame 40 can be finely managed. Further, according to the clamp 50, the outer frame is formed by induction heating through an easy operation of providing the through hole 55 and the arch portion 54 in the base 51A so that heat transfer from the base 51A to the outer frame 40 is partially suppressed. The temperature of each part of the outer frame 40 when the 40 is heated and joined can be easily determined.

According to the present embodiment, the following effects can be obtained.
(3) The temperature of each part of the outer frame 40 when the outer frame 40 is heated and joined by induction heating can be easily determined through an easy operation of providing the through hole 55 and the arch portion 54 in the base 51A. .

  (4) During induction heating using the clamp 50, the temperature of the outer frame 40 made of aluminum alloy does not rise so much, and the temperature of the base 51A made of carbon steel rises greatly. Therefore, if the amount of heat transmitted from each part of the cap 51A of the clamp 50 to the outer frame 40 can be set finely, the temperature of each part of the outer frame 40 can be set finely. According to this embodiment, since the amount of heat transmitted from each part of the base 51A to the outer frame 40 can be set finely by providing the through hole 55 and the arch part 54 in the base 51A, the outer frame 40 is formed by induction heating. The temperature of each part of the outer frame 40 when heated and joined can be finely determined.

  (5) The length of the arch portion 54 in the protruding direction P is shorter than the length of the first contact portion 52 in the protruding direction P and the length of the second contact portion 53 in the protruding direction P. As a result, the electromagnetic coil 21 is generated during induction heating as compared with the length of the arch portion 54 in the protruding direction P that is the same as the length of the first contact portion 52 or the second contact portion in the protruding direction P. Since the range through which the magnetic flux to penetrate becomes narrow, the temperature of the entire cap 51A can be lowered. Thus, according to the present embodiment, the length of the arch portion 54 in the protruding direction P can be used as a setting parameter for setting the temperature of the outer frame 40 during induction heating.

(Other embodiments)
Each of the above embodiments may be modified as follows.
-In 1st Embodiment, the thickness in the said clamping direction S of each part of 31 A of bases can be changed arbitrarily. For example, as shown in FIG. 10, one of the pair of caps 61A and 32A (the cap 61A) has the smallest thickness in the sandwiching direction S in the central portion in the protruding direction P, and the central portion You may make it the shape which becomes thick as it leaves | separates from. Further, as shown in FIG. 11, one of the pair of caps 71A and 32A (the cap 71A) is positioned on one side (on the right side in FIG. 7) with the wall thickness in the sandwiching direction S bordering the central portion in the protruding direction P. ) Becomes thinner and the other side (left side in FIG. 7) becomes thicker. In essence, the thickness of each part of the die that enables the temperature of each part of the hot melt adhesive 13 to be set to an appropriate temperature based on the experimental results is obtained in advance, and each part of the die is based on the obtained result. What is necessary is just to determine the thickness of.

  When the thickness of the outer frame in the sandwiching direction S is different in each part of the outer frame, it conforms to the thickness of each part of the outer frame so that the temperature of each part of the hot melt adhesive 13 is sufficiently high. The thickness of each part of the base in the sandwiching direction S may be set.

  -In 2nd Embodiment, the cross-sectional shape of the through-hole 55 can be changed arbitrarily. A plurality of through-holes extending in the sandwiching direction S may be provided in the base 51A. Furthermore, the through-hole 55 may be omitted if deformation due to overheating of the member provided in the outer frame 40 (the first member 43 in the second embodiment) is not a problem.

  -In 2nd Embodiment, the length of the said protrusion direction P in each part of the arch part 54 can be changed arbitrarily. The length of the projecting direction P in each part of the arch part 54 may be the same as the length of the projecting direction P of the other part (the part contacting the outer frame 40), or the length of the projecting direction P of the arch part 54 may be the same. You may make length longer than the length of the said protrusion direction P of another part. In short, the length of the arch portion 54 in the protruding direction P may be determined so that the temperature of the outer frame 40 during induction heating becomes a desired temperature.

  -In 2nd Embodiment, the extending shape of the arch part 54 can be changed arbitrarily. In addition, a plurality of portions (arch portion 54 in the second embodiment) extending away from the outer frame 40 in a state where the frames 40 and 12 are sandwiched between the pair of caps 51A and 32A may be provided in the cap. Furthermore, the arch portion 54 may be omitted if deformation due to overheating of the member provided in the outer frame 40 (second member 44 in the second embodiment) is not a problem.

  As shown in FIG. 12, as a heat transfer suppressing portion having a shape that can suppress heat transfer from the base 81A to the outer frame 80, a direction along the surface sandwiching the outer frame 80 on the base 81A (a direction along the paper surface of FIG. ) In which the edge of the base 81A is cut out may be provided.

  In the portion where the notch 86 is formed in the base 81A, the base 81A and the outer frame 80 do not come into contact with each other when the outer frame 80 is sandwiched between the base 81A. Therefore, almost no heat transfer from the base 81 </ b> A is performed on the portion of the outer frame 80 that faces the notch 86. Therefore, the heat transfer from the base 81A to the outer frame 80 through the part facing the notch 86 in the outer frame 80 is performed on the other part of the outer frame 80 (specifically, the part in contact with the base 81A). ), The heat transfer from the base 81A to the outer frame 80 is suppressed. As a result, heat transfer to the third member 85 provided in the outer frame 80 and its surroundings is suppressed, and the temperature rise of the third member 85 is suppressed, so that the third member 85 melts and the like is overheated. Therefore, unnecessary deformation of the third member 85 can be avoided.

  When using a base for joining an outer frame that is integrally provided with a member that may be deformed due to overheating, such as a decorative member made of a resin material, a sealing member made of synthetic rubber, or a cushioning member made of foamed urethane. In order to prevent the temperature of the member and its surroundings from becoming excessively high, a through hole, an arch part, a notch part, or the like may be appropriately provided in the base.

  -Instead of providing the spring 33 between the operation portions 31B and 32B of the levers 31 and 32, a fluid pressure cylinder that operates by the pressure of fluid (air or oil), an electric actuator, or the like may be provided. In short, it is only necessary that the operation portions 31B and 32B of the levers 31 and 32 can be moved closer to or away from each other at an arbitrary timing.

  As a configuration for cooling a portion adjacent to the base of the lever 31, a configuration in which a cooling water pipe 25 through which cooling water flows is provided, a configuration in which a fluid pipe other than cooling water (such as oil) passes, The structure which provides the radiation fin for air cooling, the structure which provides the blower which blows toward a lever, etc. are employable.

  If the overheating of the clamp 30 due to induction heating can be suppressed, a configuration for cooling the portion adjacent to the base of the lever 31 (in the above embodiments, the tank 23, the pump 24, and the cooling water pipe 25) May be omitted.

The portion other than the base adjacent to the outer plate in the clamp may be formed of a material other than stainless steel, such as an aluminum alloy or a heat-resistant resin material.
-The clamp and the joining method of each said embodiment are applicable also to what an inner frame and an outer frame consist of a metal material (for example, aluminum alloy) together. Moreover, the clamp and the joining method of each said embodiment are applicable also to what consists of the material (for example, carbon fiber reinforced plastic [CFRP]) in which one or both of an inner frame and an outer frame contain carbon fiber. When both the inner frame and the outer frame have high heat resistance, the pair of caps of the clamp may be formed of a material having a shallow current penetration depth (for example, carbon steel). Further, in this case, the thickness of each part of the base adjacent to the inner frame in the sandwiching direction S is set so that the temperature of each part of the inner frame becomes an appropriate temperature, or a through-hole or arm is provided in the base. Or a notch may be provided. Thereby, the temperature of each part of the inner frame when the inner frame is heated and joined by induction heating can be easily determined.

  -The forming material of the bonded member (inner frame or outer frame) and the forming material of the die adjacent to the bonded member are the same, or the forming material of the bonded member is selected from the forming material of the die adjacent to the bonded member. It is also possible to use a material with a shallow current penetration depth.

  In this case, when a base having a through-hole or a notch is used for induction heating, the portion where the through-hole or the notch is provided in the base is hardly affected by the temperature of the base and is to be joined. The surface of the member is directly heated. On the other hand, in the part where the through hole and the notch are not provided in the base, the surface of the base pressed against the member to be joined is heated and the heat of the surface is transmitted through the inside of the base to be joined. The member to be joined is heated while being influenced by the temperature of the die. For this reason, the member to be joined is easily heated in the portion of the base where the through hole and the notch are provided, while the member to be joined is heated in the portion of the base where the through hole and the notch are not provided. It can be difficult. Therefore, in this case, in addition to considering the difference in the heat transfer mode from the base in each part of the joined member as described above, the difference in ease of heating in each part of the joined member is taken into consideration. By determining the shape of the base, the temperature of each part of the joining member when the joined member is heated and joined by induction heating can be determined more finely.

-Materials other than carbon steel can be used as the material with a shallow current penetration depth.
・ Clamps used for joining two members to be joined with a hot melt adhesive sandwiched between them, as well as clamps and joining methods used for joining the inner frame and outer frame constituting the frame of the vehicle back door If it is a joining method, the clamp and joining method of the said embodiment are applicable.

  DESCRIPTION OF SYMBOLS 11 ... Inner frame, 12, 40, 80 ... Outer frame, 13 ... Hot melt adhesive, 20 ... Joining device, 21 ... Electromagnetic coil, 22 ... High frequency power supply, 23 ... Tank, 24 ... Pump, 25 ... Cooling water pipe, 30 , 50 ... Clamp, 31, 32 ... Lever, 31A, 32A, 51A, 61A, 71A, 81A ... Base, 31B, 32B ... Operation part, 33 ... Spring, 34 ... Heat transfer suppression part, 35 ... Surface, 36 ... Contact Surface, 41 ... base part, 43 ... first member, 44 ... second member, 52 ... first contact part, 53 ... second contact part, 54 ... arch part, 55 ... through hole, 85 ... third member, 86 ... notch.

Claims (10)

In order to join two members to be joined, induction heating is performed in such a manner that magnetic flux lines are penetrated in a direction in which the two members to be joined are arranged in a state in which a hot melt adhesive is sandwiched between the two members to be joined. A clamp that sandwiches the two members to be bonded against the hot melt adhesive when heating the members to be bonded,
A part of the pair of caps that sandwich the two members to be bonded is composed of a heat transfer suppressing portion having a shape that suppresses heat transfer to the members to be bonded as compared with other portions. Clamp. The clamp according to claim 1,
The clamp according to claim 1, wherein the heat transfer suppressing portion is a portion where the thickness of the base in a direction in which the member to be joined is sandwiched is partially thick. The clamp according to claim 1 or 2,
The said heat-transfer suppression part is a through-hole extended in the direction which pinches | interposes the said to-be-joined member in the said nozzle | cap | die, The clamp characterized by the above-mentioned. In the clamp according to any one of claims 1 to 3,
The said heat-transfer suppression part is a part of the shape where the edge of the said base in the direction along the surface which pinches | interposes the said to-be-joined member was notched. A joining method for joining two members to be joined by a hot melt adhesive,
A first step of sandwiching the hot melt adhesive between the two members to be joined;
A second step of sandwiching the two members to be joined by a pair of clamp caps in a state of being pressed against the hot melt adhesive;
A third step of performing induction heating in a mode of penetrating magnetic flux lines in a direction in which the two bonded members and the pair of caps are arranged in a state where the two bonded members are sandwiched between the pair of caps; Including
A joining method in which a part of the base is composed of a heat transfer suppressing part having a shape that suppresses heat transfer to the member to be joined as compared with other parts of the base as the clamp. The joining method according to claim 5,
A joining method using the clamp as the heat transfer suppression part by partially increasing the thickness of the base in a direction in which the member to be joined is sandwiched. In the joining method according to claim 5 or 6,
As the clamp, a joining method using a part in which a through-hole extending in a direction to sandwich the member to be joined is formed in the base as the heat transfer suppressing portion. In the joining method according to any one of claims 5 to 7,
A joining method comprising using, as the clamp, a portion where the edge of the base is cut out in a direction along a surface sandwiching the member to be joined, as the heat transfer suppressing portion. In the joining method according to any one of claims 5 to 8,
A joining method comprising using, as the clamp, a portion that extends partially away from the member to be joined in the state where the member to be joined is sandwiched between the pair of caps, and serves as the heat transfer suppression unit. In the joining method according to any one of claims 5 to 9,
As the clamp, at least one of the pair of caps is made of a material having a shallower current penetration depth than a material for forming the adjacent members to be bonded with the two members to be bonded interposed therebetween. Joining method.

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