JP5686676B2 - High-frequency heating device for diffusion bonding and heating upset bonding of rectangular hollow metal members - Google Patents

Description

  The present invention relates to a high-frequency heating device used when induction heating is performed for diffusion bonding and heating upset bonding of a hollow metal member having a square cross section.

  Generally, when induction heating is performed around the object to be heated, a heat treatment apparatus as disclosed in Patent Document 1 is used. Patent Document 1 discloses a heat treatment apparatus that performs induction heating around a gear. By the way, when the outer shape of the object to be heated, which is an object to be induction-heated, is circular like a gear, the heating conductor may be configured in an annular structure concentric with the gear, but the outer shape (cross section) is rectangular. When the object to be heated is induction-heated, it is necessary to configure the heating conductor along the outer shape of the object to be heated.

  When a hollow metal member having a square cross section (hereinafter referred to as an object to be heated) is induction-heated for diffusion bonding / heating upset bonding, a heating conductor of a high-frequency heating device as shown in FIG. 13 is used. The FIG. 13 is a front view of the heating conductor arranged around the object to be heated having a quadrangular cross section. A high frequency power source (not shown) is connected to the heating conductor 50 shown in FIG. 13 via leads 54 and 55. Therefore, a high frequency current can be supplied to the heating conductor 50 from a high frequency power source.

  The outer shape of the object to be heated 51 has a square shape, and the object to be heated 51 has a flat portion 52 and a corner portion 53. The heating conductor 50 is formed in a square frame shape, and has a straight portion 58 and a corner portion 59. Then, the straight portion 58 and the corner portion 59 of the heating conductor 50 are disposed opposite to the flat portion 52 and the corner portion 53 of the object to be heated 51 with an induction heating distance L therebetween, and the heating conductor 50 is energized to be covered. The heated object 51 is induction-heated.

  As a heating conductor that uniformly heats the entire object to be heated so as not to cause a temperature difference, Patent Document 8 and Patent Document 2 are known as an improvement thereof. However, since these do not have a divided structure, they cannot be applied to heating of a long object or a metal member having a different longitudinal shape in which the heating conductor cannot be moved in the longitudinal direction when the heating conductor is attached or detached.

  On the other hand, as an example of the split type heating conductor, there are Patent Document 3, Patent Document 4 and Patent Document 5 used for diffusion bonding of a round cross-section metal tube, etc., but these are round cross sections and the cross section is rectangular. This is not an example of a hollow metal member.

  Patent Document 6 describes a method for diffusion bonding of strips with heating upset, and describes that the strips are heated by a high-frequency heating device.

  In Patent Document 7, as an example of diffusion bonding and heating upset bonding of an object to be heated, one of the present inventors shows application to an axle case. Patent Document 6 describes an example in which two parts are joined at an angular cross section of an axle case. The component on one side has a flange. When diffusion bonding is adopted, a heating conductor having a divided structure is required in consideration of actual production.

JP 09-118925 A JP 2008-293905 A JP-A-7-249484 JP-A-6-168777 JP-A-10-69967 JP-A-6-210465 JP 2010-188924 A Utility Model Registration No. 3018060

  By the way, in the case of diffusion bonding of a round cross-section hollow metal tube as disclosed in Patent Document 5, a rotating mechanism is provided on the heating conductor or the material to be heated to rotate it in the circumferential direction, and the material to be heated is rotated in the circumferential direction. It is stated that uniform heating can also be achieved. However, as shown in FIG. 13, the outer shape is rectangular, and the linear portion 58 and the corner portion 59 of the heating conductor 50 are separated from the flat portion 52 and the corner portion 53 of the object 51 by a distance L. If the heating conductor 50 and the object to be heated 51 are relatively rotated, the corner portion 53 of the object to be heated 51 collides with the straight part 58 of the heating conductor 50. Therefore, the object to be heated 51 and the heating conductor 50 cannot be relatively rotated during induction heating.

  Further, when the heating conductor 50 has an annular structure as shown in FIG. 13, a seam 50 a is generated between the leads 54 and 55. As a result, the induction heating of the portion 51 a of the heated object 51 that faces the joint 50 a of the heating conductor 50 cannot be performed, and the temperature rise of the portion 51 a that faces the joint 50 a of the heating conductor 50 is adjacent to the heated object 51. There is nothing but heat transfer from 51b. That is, since there is a part (opposing part 51a) that cannot be induction-heated in the entire periphery of the object to be heated 51, it is not easy to raise the temperature of the entire periphery of the object to be heated 51 uniformly.

  Further, the outer shape of the cross-section of the object to be heated 51 is rectangular, and even if the heating conductor 50 is disposed along the periphery of the object to be heated 51 by a distance L, the flat part 52 and the corner part 53 are provided. And there is a difference in temperature rise. Therefore, even if the object to be heated 51 is induction-heated through the high-frequency induction current to the heating conductor 50, the temperature of the portion 51a facing the joint 50a of the heating conductor 50 is not easily increased, and the flat portion 52 and the corner portion 53 But there will be a temperature difference. On the other hand, as a technique for preventing a temperature difference between the flat portion 52 and the corner portion 53, there is Patent Literature 8 and Patent Literature 2 as an improvement thereof. However, these are not heating conductors based on division.

  If the corner 53 is overheated, the product (the heated object 51 after the heat treatment) must be discarded. Therefore, the manufacturer must induction-heat the article 51 to be heated with great care so that the temperature is uniform over the entire circumference of the article 51 to be heated.

  However, such a heating operation requiring careful attention by the producer not only imposes a great burden on the producer but also tends to cause variations in the quality of the product. Furthermore, in the case where another object to be heated having a different shape (R shape) of the corner portion 53 is induction-heated, if the degree of heating is not adjusted by adjusting the amount of recourse depending on the manufacturer's intuition, the periphery of the object to be heated is The temperature cannot be raised uniformly, and such a heating operation is very difficult unless skilled. That is, in the heating conductor 50 as shown in FIG. 13, it corresponds to a plurality of types of objects to be heated whose corner portions have different shapes, or even the same object to be heated corresponds to a slight difference in dimensional tolerance. Have difficulty.

  Accordingly, the present invention provides a split-type heating conductor capable of uniformly performing induction heating over the entire circumference of a square of a metal member when induction heating a square metal member (object to be heated) having a hollow cross section. It is an object of the present invention to provide a high-frequency heating device having:

In order to achieve the above-mentioned object, the invention of claim 1 is the heating formed in a rectangular shape so as to surround the rectangular metal member in order to perform diffusion bonding and heating upset bonding of the rectangular metal member having a hollow cross section. In the high-frequency heating apparatus for induction heating using a conductor, the rectangular heating conductor is formed of a plurality of divided pieces, and a pair of leads connected to a high-frequency power source are connected to the end portions of the adjacent divided pieces. , electrically connecting the ends of the other divided piece forming the heating conductor, the corners of the heating conductor formed by these split pieces, changing the distance from the corner of the metal member In addition, a high-frequency heating apparatus is provided that includes corner induction heating adjustment means that adjusts the magnitude of the induction current that is conducted to the corner of the metal member by conducting an induced current.

  According to a second aspect of the present invention, the heating conductor is connected to a pair of leads connected to a high-frequency power source, and the first divided piece extending from the corner of the metal member along the side of the metal member and It is connected to the ends of the two divided pieces, the first divided piece and the second divided piece, is formed in an L shape along the two sides of the metal member, and is formed of a third divided piece. And the end of the second divided piece and the end of the third divided piece are connected by a fastening means, and the corner induction heating adjusting means includes the end of the first divided piece, the end of the second divided piece, and the end of the third divided piece. The high-frequency heating device according to claim 1, wherein the high-frequency heating device is configured by an interposition member that is provided so as to be position-adjustable along the end portion thereof and that conducts between the end portions.

According to a third aspect of the present invention, the first divided piece and the second divided piece include a linear main body portion that is bent from the lead and extends along the side of the metal member, and an end portion that is bent from the main body portion. The L-shaped third divided piece includes a straight portion extending along two sides of the metal member around the bent portion, and an end portion bent from the straight portion. The end of the two split pieces and the end of the third split piece are formed in parallel, and an interposition member is movably provided between the end portions, and the end portions are connected to each other by the fastening means. The high-frequency heating device according to claim 2, wherein the member is fixed.

  According to a fourth aspect of the present invention, the bent portion of the third divided piece is formed in a U shape having a groove portion that is open on the inner peripheral side, and the interposition member that can conduct to the groove portion is adjusted along the depth direction of the groove portion. The high-frequency heating device according to claim 3, wherein the corner portion induction heating adjusting means is provided freely.

  The invention of claim 5 is a high-frequency heating device used when induction heating is performed for diffusion bonding / heating upset bonding of a rectangular metal member having a hollow cross section. A high-frequency power supply to be supplied; and a heating conductor through which a high-frequency current supplied from the high-frequency power supply is passed. The heating conductor is arranged around the metal member and can induction-heat the metal member. Lead members are connected to both ends of the heating conductor, and each of the lead members guides a high-frequency current from the high-frequency power source side to the heating conductor. The heating conductor includes a plurality of divided pieces and each divided piece. The heating conductor has a rectangular annular shape in which the fastening portion of each divided piece and the portion to which the lead member of the heating conductor is connected are arranged at the four corners. Presents the structure In addition, a conductive interposable member is disposed between the divided pieces at the fastening portion of each divided piece, and each of the interposed members is in an arbitrary position in a direction of moving forward and backward with respect to the inside of the annular rectangular shape of the heating conductor. It is a high frequency heating device characterized by being able to be clamped by a split piece.

  According to a sixth aspect of the present invention, at least one of the divided pieces of the heating conductor has a bent portion constituting one corner of the annular square, and the bent portion is substantially an opening side facing the inside of the square. The groove portion has a U-shape, and an interposition member that is movable and conductive along the depth direction of the groove portion is disposed in the groove portion, and the bent portion is disposed in the groove portion. The high-frequency heating device according to claim 1, wherein an adjusting means for fixing the interposition member is provided.

  In the present invention, since the heating conductor has a plurality of divided pieces and fastening means that enables fastening and disassembly of each divided piece, it can be easily attached to and detached from the metal member. That is, after induction heating of the metal member, the heating conductor can be easily detached from the metal member by disassembling the fastened divided pieces. If the heating conductor is configured to be disassembled into a plurality of divided pieces, it is very convenient when the metal member is long.

  The heating conductor has a square annular structure in which the fastening portion of each divided piece and the portion to which the lead member of the heating conductor is connected are arranged at the four corners. Since it arrange | positions between division pieces in the fastening part of a division piece, one division piece and the other division piece of a heating conductor can be conducted through an interposition member.

  Since each interposed member can be sandwiched by divided pieces at any position in the direction of advancement and retreat with respect to the inside of the annular rectangular shape of the heating conductor, the interposed member can be brought close to or separated from the metal member. it can.

  Further, a high-frequency current flows from one divided piece to the other divided piece through the interposition member. At that time, since the high-frequency current flows between the split pieces via the interposition member, the amount of the induced current excited in the portion facing the interposition member of the metal member can be adjusted according to the position of the interposition member. it can. And the induction heating amount of a corner | angular part can be adjusted now by making the site | part facing this interposition member into the corner | angular part of metal members. As a result, the corner portion can be prevented from being overheated, and the induction heating can be performed uniformly over the entire circumference of the metal member.

  Furthermore, it can avoid that the corner | angular part will be in an overheated state by making the site | part with which the lead member of the heating conductor was connected to one corner | angular part of metal members. That is, a gap is generated between the portions where the lead members of the heating conductor are connected, and no high-frequency current flows through this gap. Therefore, when this gap is opposed to the corner portion of the metal member, the induced current is not excited in the corner portion, and the corner portion can be prevented from being overheated. Furthermore, the amount of heating at the other corner can be adjusted by adjusting the position of the interposition member. Therefore, all corners can be heated to the same extent.

  As a result, it is possible to make uniform the temperature rise around the entire circumference of the rectangular metal member. Here, the metal member is a member made of iron (steel or cast iron) capable of diffusion bonding / heating upset bonding by induction heating.

  According to the present invention, at least one of the divided pieces of the heating conductor has a bent portion constituting one corner of the annular square, and the bent portion has a substantially U-shape facing the inside of the annular square. Since the adjusting means for adjusting the width of the groove is provided, the interposition member can be moved in a direction to advance and retreat with respect to the inside of the annular rectangular shape of the heating conductor. .

  As a result, it is possible to adjust the amount of induction heating at the corners of the metal member opposed to the bent portion, and to prevent the corner from becoming overheated. Moreover, the heating amount of the corner can be adjusted to the same level as the heating amount of the other corners of the metal member. As a result, it becomes possible to uniformly raise the temperature of the entire circumference of the square of the metal member.

  The high-frequency heating device of the present invention suppresses a temperature rise at a corner portion that is likely to be overheated when induction-heating a rectangular metal member having a hollow cross section, and is applied over the entire circumference of the rectangular metal member. Can be induction-heated. Therefore, the entire periphery of the square of the metal member can be induction-heated satisfactorily.

  By manufacturing the heating conductor and adjusting the interposition member position at the corner, it becomes possible to adjust the temperature of the corner, and it is no longer necessary to remake the heating conductor for adjusting the corner temperature.

  Furthermore, it is possible to cope with the case where the shape of the corner of the object to be heated changes depending on the lot or the material of the object to be heated changes.

  As a result, the development period and development cost can be greatly reduced.

It is a perspective view of the heating conductor of the high frequency heating apparatus which implemented this invention. It is a disassembled perspective view of the heating conductor of FIG. It is the simplified front view of the heating conductor which implemented this invention. (A) is an enlarged view of the A part of FIG. 3, (b) is an enlarged view which shows the state which made the interposition member approach the to-be-heated material side in (a). (A) is a front view which shows the state which decomposed | disassembled the heating conductor in FIG. 3, (b) is a side view of the clamp member shown to (a), has shown the clamp release state, (c) is It is a side view of the clamp member of the state clamped, (d) is a side view of the clamp member which shows the state clamped via the spacer. In FIG. 5A, it is a front view showing a state where the clamp member of the bent portion is further removed. In FIG. 3, it is a front view which shows the state which removed the clamp member of the bending part. (A) is the disassembled perspective view which looked at the fastening part of the division pieces of a heating conductor from the lower part, (b) is the disassembled perspective view which looked at the fastening part of (a) from the upper part, (c) (A) is the perspective view in the process of assembling the fastening part, (d) is the assembly perspective view of the fastening part of (a), (e) is an interposition member in a fastening part in (d). (F) is a perspective view showing a state in which the interposition member at the fastening part of (e) is moved in the direction of the arrow, and (g) is a bent part of the split piece. FIG. It is a perspective view which shows the state which has arrange | positioned the heating conductor shown in FIG. 1 around the to-be-heated material. It is a schematic block diagram of the high frequency heating apparatus of this invention. The time-dependent change of the temperature of the flat part and the corner part of the metal member when heated and controlled by the high-frequency heating device of the present invention and the conventional high-frequency heating device is shown, (a) shows the present invention, (b) shows the conventional example. FIG. It is a figure which shows the example which applied the high frequency heating apparatus of this invention to diffusion bonding and heating upset joining. It is a front view of the state which has arrange | positioned the conventional heating conductor around the to-be-heated object whose cross section is square shape.

  Hereinafter, the configuration of a high-frequency heating apparatus embodying the present invention will be described with reference to the drawings. As shown in FIG. 10, the high-frequency heating device 10 has a configuration in which a high-frequency power source 1 and a heating conductor 6 are connected by leads 5a and 5b.

  The high frequency power source 1 has an AC power source 2, a high frequency transmitter 3, and a transformer 4. The AC power source 2 is a commercial power source having a frequency of 50 to 60 hertz. The high-frequency transmitter 3 converts the frequency of the AC power source 2 into a higher frequency, and the transformer 4 converts the voltage of the AC power source 2 into a high voltage. The high frequency and high voltage power is supplied to the heating conductor 6 via the leads 5a and 5b. That is, a high frequency current flows through the heating conductor 6.

  Next, the heating conductor 6 having a characteristic configuration of the present invention will be described with reference to FIGS. As shown in FIGS. 10, 5A, 6, and 7, the heating conductor 6 includes a first divided piece 6a connected to the lead 5a, a second divided piece 6b connected to the lead 5b, And a third divided piece 6c connected to the first divided piece 6a and the second divided piece 6b.

  The first divided piece 6a of the heating conductor 6 is a linear member formed of a good conductor made of copper or a copper alloy. Further, a hollow portion 13a (shown in FIG. 8A and the like) is provided inside the first divided piece 6a. A cooling liquid can be supplied to the hollow portion 13a from a cooling liquid supply source (not shown), and the first divided piece 6a can be cooled. In the first divided piece 6a, both ends of the linear main body portion are bent. In the example shown in FIG. 10, both end portions of the first divided piece 6a are bent at an angle of 135 degrees with respect to the main body portion. One end is connected to the lead 5a, and the connecting member 7 (FIG. 3) is connected to the other end 17a.

  As shown in FIGS. 8A to 8C, the connecting member 7 is fixed to the opposing surface 17b and the end surface 17c of the end portion 17a of the first divided piece 6a by brazing. The connection member 7 has a shape including a flat protrusion 20 on one side of the main body (a rectangular parallelepiped portion). Further, as shown in FIGS. 8A and 8B, the connection member 7 is provided with an installation surface 14 c that continues from the main body to the protruding portion 20. An installation surface 14a is provided on the opposite side of the protrusion 20 from the installation surface 14c. Further, the connection member 7 is provided with an installation surface 14b that is continuous with and orthogonal to the installation surface 14a. The installation surface 14 b is provided on the side surface of the main body of the connection member 7.

  A hole 7 a is opened in the installation surface 14 c formed in the main body portion of the rectangular parallelepiped of the connection member 7. A step 7c having a large diameter on the opening side and a small diameter on the back side is formed in the hole 7a. An O-ring 9 is loaded in the stage 7c. Further, a hole 7 b is opened in the installation surface 14 b of the connection member 7. The hole 7 a and the hole 7 b have the same diameter and communicate with each other inside the main body of the connection member 7. That is, a passage for communicating the holes 7 a and 7 b is formed inside the connection member 7.

  The installation surface 14a of the connection member 7 is brazed against the opposing surface 17b (clamping portion) of the end 17a of the first divided piece 6a, and the end surface 17c of the first divided piece 6a is brazed to the installation surface 14b. Abutted and brazed. As a result, the connecting member 7 is integrally fixed to the first divided piece 6a of the heating conductor 6, and further communicates with the hollow portion 13a of the first divided piece 6a and the openings 7b and 7a being kept fluid-tight.

  Next, the 2nd division piece 6b has the same raw material and structure as the 1st division piece 6a, and is equipped with the hollow part 13b inside. As shown in FIG. 10, the second divided piece 6b is arranged so as to be bilaterally symmetric with the first divided piece 6a, one end is connected to the lead 5b, and the other end 28 is connected to the connecting member 7 ( 3) is connected. Since the other structure of the 2nd division | segmentation piece 6b is the same as the structure of the 1st division | segmentation piece 6a, the overlapping description is abbreviate | omitted.

  Next, the third divided piece 6c will be described.

  The 3rd division piece 6c is comprised with the hollow linear member which consists of good conductors, such as copper or a copper alloy, similarly to the 1st division piece 6a. That is, the 3rd division piece 6c has the hollow part 13c inside. The third divided piece 6 c has straight portions 31 and 32 and a bent portion 33. As shown in FIG. 10, the straight portions 31 and 32 are connected via a bent portion 33, and the straight portion 31 and the straight portion 32 are in a positional relationship orthogonal to each other. As shown in FIG. 10, the end portion 16 a that is the free end of the straight portion 31 is bent at an angle of 135 degrees with respect to the straight portion 31. Similarly, the end portion 29 that is the free end of the straight portion 32 is The straight portion 32 is bent at an angle of 135 degrees. A connecting member 8 is connected to the ends 17a and 28 as shown in FIG.

  As shown in FIGS. 8A to 8C, the connecting member 8 is brazed to the opposing surface 16b and the end surface 16c of the end portion 16a of the third divided piece 6c. The connecting member 8 has the same configuration as the connecting member 7 described above. That is, the connecting member 8 includes a rectangular parallelepiped main body, a protruding portion 19, installation surfaces 15a to 15c, and holes 8a and 8b. Then, the connection member 8 is disposed opposite to the connection member 7 in a posture opposite to the connection member 7 in the upside down direction. Specifically, as illustrated in FIG. 8B, the connection member 8 is disposed so that the installation surface 15 c of the connection member 8 faces the installation surface 14 c of the connection member 7. The connection member 8 is different from the connection member 7 only in that a step is not provided in the hole 8 a that opens in the installation surface 15 c, and the other configuration is the same as that of the connection member 7. The hole 8a has the same diameter as the inner diameter of the O-ring 9 or a small diameter.

  Then, as shown in FIG. 8C, the end surface 16c of the end portion 16a abuts on the installation surface 15b of the connection member 8 and is brazed, and the opposing surface 16b of the end portion 16a (clamping) is held on the installation surface 15a of the connection member 8 Part) is abutted and brazed. As a result, the hollow portion 13c of the third divided piece 6c and the holes 8b and 8a of the connecting member 8 communicate with each other in a liquid-tight state. A connecting member 8 having the same configuration as that of the connecting member 8 is brazed to an end portion 29 which is a free end of the straight portion 32 of the third divided piece 6c.

  As shown in FIG. 8G, the bent portion 33 of the third divided piece 6c has a substantially U-shape.

  The bent portion 33 may be formed in a substantially U shape by appropriately bending one linear member, but can be easily formed in a substantially U shape by adding a plurality of members. A groove 33a is formed in the bent portion 33 at a substantially U-shaped portion. As shown in FIG. 10, the groove 33a is opened inside the heating conductor 6 having a rectangular frame shape. The width of the groove 33a is large enough to arrange an interposed member 18c (described later). Specifically, the bent portion 33 protrudes to the outside of the rectangular frame, and the opening of the groove 33 a is disposed on the extension of the straight portion 31 and the straight portion 32. The width of the groove 33a is larger than the gap 6d between the leads 5a and 5b.

  Further, the bent portion 33 is clamped by the clamp member 30 as shown in FIG. As shown in FIG. 5B, the clamp member 30 has the same configuration as the clamp member 22 that fastens the split piece 6a and the split piece 6c and the clamp member 22 that fastens the split piece 6b and the split piece 6c. ing.

  That is, as shown in FIGS. 5B and 5C, the clamp member 30 has a main body 23 having a substantially U-shape. The main body 23 includes a pair of parallel portions 24 and 25 and a connection portion 26 that connects the parallel portions 24 and 25. The parallel portion 24 is provided with a screw hole 24a into which the screw 27 is screwed. Further, the parallel portion 25 is provided with a fixing surface 25 a that faces the tip portion 27 a of the screw 27. That is, by adjusting the screwing amount of the screw 27, the distance from the tip 27a of the screw 27 to the fixed surface 25a changes. FIG. 5B shows a state where the screw 27 has a small screw-in amount and a long distance from the tip 27a of the screw 27 to the fixing surface 25a, and FIG. 5C shows that the screw 27 has a large screw-in amount. 27 shows a state in which the distance from the distal end portion 27a of 27 to the fixed surface 25a is short. That is, FIG. 5C shows a state in which the clamp member 21 fixes the connection members 7 and 8.

  Further, as shown in FIG. 5 (d), a spacer 34 may be disposed between the distal end portion 27 a of the screw 27 and the connection member 8. The spacer 34 has the function of reducing the screwing amount of the screw 27 and increasing the pressure receiving area. That is, a plurality of spacers 34 can be used simultaneously as necessary. In the example shown in FIGS. 1 and 2, five spacers are used for the bent portion 33 of the third divided piece 6c.

  As shown in FIG. 6, when the bent portion 33 is not clamped by the clamp member 30, the groove 33a of the bent portion 33 is expanded, and the position of the interposition member 18c can be freely changed in the groove 33a.

  As shown in FIG. 5, when the bent portion 33 is clamped by the clamp member 30, the groove 33a of the bent portion 33 is narrowed, and the interposition member 18c is fixed in the groove 33a.

  That is, the width dimension of the groove 33a of the bent portion 33 of the third divided piece 6c is larger than the dimension D2 of the interposition member 18c when not clamped by the clamp member 30, and when clamped by the clamp member 30 The interposed member 18 is sandwiched in the groove 33a.

  In this state (the state shown in FIG. 5), the straight portion 31 and the straight portion 32 of the third divided piece 6c are in an orthogonal state. When the clamp member 30 is loosened, the interposition member 18c as the corner portion induction heating adjustment means can move in the groove 33a.

  In order to connect the respective divided pieces 6a, 6b, 6c, first, the interposing member 18c is arranged at the bent portion 33 of the third divided piece 6c and clamped by the clamp member 30, and the third divided piece 6c is shown in FIG. The state shown in a) is set. Then, as shown in FIG. 5 (b), the interposed member 18 a is sandwiched between the end portion 17 a of the first divided piece 6 a and the end portion 16 a of the third divided piece 6 c and clamped by the clamp member 22. Similarly, the interposed member 18b is sandwiched between the end portion 28 of the second divided piece 6b and the end portion 29 of the third divided member, and is clamped by the clamp member 22. Thereafter, as shown in FIGS. 3 and 4, the connection member 7 connected to the end portion 17 a of the first divided member 6 a and the connection member 8 connected to the end portion 16 a of the third divided piece 6 c are connected by the clamp member 21. Clamp. Similarly, the connecting member 7 connected to the end portion 28 of the second divided member 6 b and the connecting member 8 connected to the end portion 29 of the third divided piece 6 c are clamped by the clamp member 21. At this time, the O-ring 9 ensures liquid tightness between the connecting members 7 and 8.

  That is, as shown in FIGS. 2 to 4, both connecting members 8 and 7 are covered with two divided protective members 40 and 41, and a C-shaped clamp member 21 is fitted to the protective members 40 and 41, thereby When the connection members 7 and 8 are accommodated inside the member 21 and the screwing amount of the screw 27 is increased, the connection members 7 and 8 are sandwiched by the screw 27 via the protection members 40 and 41. By the clamping by the clamp member 21, the O-ring 9 disposed between the connection members 7 and 8 is pressed, and liquid tightness between the hole 7 a of the connection member 7 and the hole 8 a of the connection member 8 is ensured.

  As a result, a coolant passage leading from the first divided piece 6a to the third divided piece 6c and from the third divided piece 6c to the second divided piece 6b is formed.

  Thereafter, the end 17a of the first divided piece 6a and the end 16a of the third divided piece 6c are clamped by the clamp member 22. In that case, the interposition member 18a shown in FIG.8 (d) is arrange | positioned between the edge part 17a and the edge part 16a. Then, as shown in FIG. 3, by clamping with the clamp member 22, the interposing member 18a is formed between the facing surface 17b (first divided piece 6a) of the end portion 17a and the facing surface 16b (third divided piece 6c) of the end portion 16a. Pinch. As a result, the interposition member 18a is fixed between the end portion 17a and the end portion 16a, and the end portion 17a and the end portion 16a become conductive through the interposition member 18a. That is, the opposing surface 17b and the opposing surface 16b constitute a sandwiching portion that sandwiches the interposition member 18a as the corner portion induction heating adjusting means.

  By the fastening by the clamp member 22, the conductivity between the connection members 7 and 8 through the interposition member 18a is ensured. In the present embodiment, the clamp member 21 and the clamp member 22 are used, but by securing with one clamp member, the liquid-tightness and electrical conductivity between the connection members 7 and 8 are ensured. You can also.

  Similarly, when the end portion 28 of the second divided piece 6b and the end portion 29 of the third divided piece 6c are fastened, the heating conductor 6 is configured as shown in FIG. Since the connection form of the second divided piece 6b and the third divided piece 6c is the same as the connection form of the first divided piece 6a and the third divided piece 6c, the overlapping description is omitted.

  Here, the interposition member 18b has the same configuration as the interposition members 18a and 18c. That is, the interposed member 18a (18b, 18c) is formed of a good conductor such as copper or a copper alloy, and has a sandwiched portion 12b and a flange portion 12a. The sandwiched portion 12b is a rectangular parallelepiped portion that is sandwiched between the end portion 17a of the first divided piece 6a and the end portion 16a of the third divided piece 6c. The flange portion 12a is fixed to one end of the sandwiched portion 12b. The flange portion 12a is a portion that is brought into contact with the end portion 17a of the first divided piece 6a and the end portion 16a of the third divided piece 6c. That is, when the flange portion 12a is brought into contact with the end portions 17a and 16a, the sandwiched portion 12b can be reliably disposed between the opposing surface 17b and the opposing surface 16b. Further, when the flange portion 12a is brought into contact with the end portions 17a and 16a, the interposed member 18 can be easily slid along the end portions 17a and 16a. Further, when the flange member 12a is provided on the interposed member 18, the interposed member 18 can be easily moved by gripping the flange member 12a.

  The protruding portion 20 of the connecting member 7 and the connecting member 8 are such that the dimension D2 of the interposed member 18a is smaller than the distance D1 between the end portion 17a of the first divided piece 6a and the end portion 16a of the third divided piece 6c. The thickness dimension of the protruding portion 19 is set. Therefore, if it is in the state before clamping with the clamp member 22 (a state in which the screw 27 is screwed in a small amount), the interposed member 18 is between the end portion 17a of the first divided piece 6a and the end portion 16a of the third divided piece 6c. Can be arranged at any position (any position in the direction of advancing and retreating with respect to the inside of the annular square of the heating conductor 6). That is, as shown in FIG. 8 (e) and FIG. 8 (f), the interposition member 18 as the corner induction heating adjusting means can be moved.

  When the position of the interposed member 18a is determined, the first divided piece 6a and the third divided piece 6c are clamped by the clamp member 22 with the interposed member 18a sandwiched therebetween. As a result, the interposed member 18a is firmly fixed to the first divided piece 6a and the third divided piece 6c and cannot move, and further, the interposed member 18a is interposed between the first divided piece 6a and the third divided piece 6c. Stable energization is possible through this.

  Although the heating conductor 6 functions sufficiently by the above-described configuration, it is preferable that the heating conductor 6 is further reinforced by the reinforcing member 35 as shown in FIGS. 1 and 2 to maintain the rectangular frame shape. The reinforcing member 35 includes support pieces 36 and 37 and a connection piece 38. The support pieces 36 and 37 are plate-shaped.

  One end of the support piece 36 is brazed to a portion in the middle of the straight portion 31 of the third divided piece 6c. That is, one end of the support piece 36 is fixed to the linear portion 31 so that the support piece 36 is parallel to the end portion 16a of the third divided piece 6c. A hole 36 a is provided at the other end of the support piece 36. Similarly, one end of the support piece 37 is brazed to a part of the first divided piece 6a so that the support piece 37 is parallel to the end portion 17a of the first divided piece 6a. A hole 37 a similar to the hole 36 a of the support piece 36 is also provided at the other end of the support piece 37.

  The connecting piece 38 is plate-shaped, and has a hole (not shown) at one end and a groove 38a at the other end. In the example shown in FIG. 2, the connection piece 38 is arranged so as to face in the up-and-down direction, and a hole (not shown) provided in the lower end and the hole 37 a of the support piece 37 are aligned and connected to the support piece 37. The piece 38 is fixed with bolts and nuts 39.

  Similarly, the hole 36 a of the support piece 36 is aligned with the groove 38 a provided at the upper end of the connection piece 38, and the support piece 36 and the connection piece 38 are fixed by the bolts and nuts 42. Thereafter, the first divided piece 6a and the third divided piece 6c are firmly fixed by the clamp members 21 and 22.

  As a result, when an external force is applied to the heating conductor 6, the load on the clamp members 21 and 22 is reduced, and the external force is supported by the reinforcing member 35. The second divided piece 6 b and the third divided piece 6 c are also reinforced with the same reinforcing member as the reinforcing member 35.

  Moreover, the connection members 7 and 8 can be protected by clamping the connection members 7 and 8 with the clamp member 21 via the protection members 41 and 40.

  Next, the operation of the heating conductor 6 will be described.

  The disassembled heating conductor 6 as shown in FIG. 2 is assembled as shown in FIG. 1, and the object to be heated 11 (rectangular hollow metal member) is placed inside the annular rectangular heating conductor 6 as shown in FIG. Deploy. The object to be heated 11 is supported by a support mechanism (not shown). The object to be heated 11 is a hollow member having a square cross section, and has four corners 11a to 11d. The object to be heated 11 is formed of iron (steel or cast iron) that can be diffusion bonded and heated upset bonded by induction heating. In FIG. 9, the corner portion 11 d of the object to be heated 11 is positioned below, and the corner portion 11 d is disposed close to the portion connected to the leads 5 a and 5 b of the heating conductor 6.

  Further, the corner portion 11a is disposed close to the connection portion between the first divided piece 6a and the third divided piece 6c, and similarly, the corner portion 11c is disposed close to the connection portion between the second divided piece 6b and the third divided piece 6c. . And the corner | angular part 11b is arrange | positioned adjacent to the bending part 33 of the 3rd division | segmentation piece 6c. At that time, the interposed member 18a (arranged between the first divided piece 6a and the third divided piece 6c), the interposed member 18b (arranged between the second divided piece 6b and the third divided piece 6c), and the interposed member 18c. The position of (arranged in the groove of the bent portion 33 of the third divided piece 6c) is set, and fixed by each clamp member so as not to move.

  In the high-frequency heating device 10, a heating conductor having an annular rectangular frame shape is configured by fastening a plurality of divided pieces, and a fastening portion between the divided pieces in the heating conductor and a portion connected to the leads 5 a and 5 b are heated objects 11. This is largely different from the conventional heating conductor 50 shown in FIG.

  That is, the distance from each interposed member to each corner of the object to be heated is adjusted so that each corner of the object to be heated is induction heated satisfactorily. For example, a preferable distance is obtained in advance by experiments according to the R shape of the corner. Then, the correspondence between the distance from the interposition member to the corner and the R shape of the corner is mapped. As a result, the operator can easily set the position of the interposition member by confirming the R shape of the corner of the object to be heated and referring to the map. When the position of the interposed member is determined, the clamp member is fixed so that the position of the interposed member does not change.

  When the object to be heated 11 is relatively long, each divided piece of the heating conductor 6 is disassembled, the object to be heated 11 is arranged on the first divided piece 6a and the second divided piece 6b, and further the object to be heated 11 The third divided piece 6c is approached from above, and the third divided piece 6c is connected to the first divided piece 6a and the second divided piece 6b. By doing in this way, the heating conductor 6 can be quickly disposed opposite to the heating target portion of the article 11 to be heated. Further, even when the heating target portion of the article to be heated 11 is smaller than both sides of the heating target portion (that is, when the heating target portion is bundled), the heating conductor 6 is disassembled into a plurality of divided pieces and assembled, thereby being smoothly heated. The heating conductor 6 can be disposed opposite to the part.

  When the object to be heated 11 is relatively short, the heating conductor 6 is assembled in advance as shown in FIG. That is, the clamp member 21 maintains a fastening state and forms a cooling water passage in which liquid tightness is maintained. And only the clamp member 22 which fixes the position of the interposed member 18a is loosened, and when the position of the interposed member 18a is fixed, the clamp member 22 is fastened. Thereby, the operation | work which installs the heating conductor 6 in the to-be-heated material 11 can be simplified. Then, if the edge part of the to-be-heated material 11 is inserted in the inside of the heating conductor 6, the heating conductor 6 can be easily made to oppose a heating object site | part.

  As shown in FIG. 3, the heating conductor 6 is arranged around the object to be heated 11 having a quadrangular cross section so that the distance from the straight portion of the heating conductor 6 to the object to be heated 11 is uniformly the distance L. Further, the distance from the interposition member 18a to the corner portion 11a of the article 11 to be heated is set to a distance L1 as shown in FIG. 4A, for example, according to the R shape of the corner portion 11a, or as shown in FIG. Thus, the distance is L2.

  That is, when the induction heating amount of the corner portion 11a is decreased, the interposed member 18a is separated from the corner portion 11a by, for example, the distance L1 (FIG. 4A), and the induction heating amount of the corner portion 11a is increased. Causes the interposition member 18a to approach the corner portion 11a, for example, to a distance L2 (FIG. 4B).

  Even if the high-frequency current 43 supplied to the heating conductor 6 is constant, the induced current 44a generated in the corner 11a when the distance from the interposed member 18a to the corner 11a is L1 (FIG. 4 (a)) When the distance from the member 18a to the corner 11a is L2 (FIG. 4B), it is smaller than the induced current 44b generated in the corner 11a. Therefore, the temperature rise of the corner 11a can be adjusted by the magnitude of the induced current that is excited. And the distance from the interposition member 18a to the corner | angular part 11a is set so that the perimeter of the to-be-heated material 11 may be heated uniformly, and the corner | angular part 11a may not overheat. The positions of the interposition members 18c and 18b are similarly set for the other corner portions 11b and 11c.

  As described above, in the heating conductor 6, by changing the positions of the interposition members 18 a to 18 c, the induction heating amounts of the corner portions 11 a to 11 c in the heated object 11 having a quadrangular cross section can be relatively increased. Can be adjusted. Moreover, the temperature rise of the corner portion 11d can be suppressed by making the portion of the heating conductor 6 to which the leads 5a and 5b are connected face one corner portion 11d of the article 11 to be heated. That is, a gap 6d is formed between the portions where the leads 5a and 5b are connected. Since no high-frequency current flows through the gap 6d, the induced current excited by the corner portion 11d is small and the heating amount is small. Therefore, the temperature rise of the corner portion 11d is suppressed and the overheating state is prevented.

  If the other corner portions 11a to 11c of the article to be heated 11 are configured so that the interposed members 18a to 18c can be arranged respectively, and the high-frequency current flows through the interposed members 18a to 18c, the interposed members 18a to 18c. By changing the position of 18 c (changing the distance from the corners 11 a to 11 c of the object to be heated 11), the magnitude of the induced current excited in the corners 11 a to 11 c of the object to be heated 11 can be adjusted. . That is, the positions of the interposition members 18a to 18c are adjusted so that the temperature of the other corner portions 11a to 11c is increased in the same manner as the opposite corner portion 11d where the leads 5a and 5b of the heating conductor are connected.

  The high-frequency heating device 10 (FIG. 10) of the present invention can perform induction heating so that the flat portions and the corner portions 11a to 11d of the hollow object 11 having a square cross section are heated to the same extent.

  Moreover, the high frequency heating apparatus 10 can be used for various purposes to raise the temperature of the object to be heated 11.

  FIG. 11 (a) shows a graph of the change over time in the temperature measured for the flat and corner portions when heated by the heating conductor of the present invention, and FIG. 11 (b) shows the prior art shown in FIG. It is the example which showed the graph of the time-dependent change which measured the temperature of the flat part at the time of heating with a heating conductor, and a corner | angular part.

  In the temperature control, the ON-OFF control of the induced current was started when the flat portion reached the set temperature, and the temperature control was performed while measuring the flat portion temperature with a thermocouple.

  When heated with a conventional heating conductor as shown in FIG. 11 (b), the flat portion can be controlled at a control temperature of 1050 ° C., but the corner temperature rises by nearly 50 ° C. relative to the control temperature of 1050 ° C. Shooting will cause problems in diffusion bonding.

  On the other hand, as shown in FIG. 11A, the one heated with the heating conductor of the present invention has (1) a temperature difference between the flat portion and the corner portion and a control temperature of 1080 ° C., 2) The corner rises more slowly during heating than the flat part, but does not overshoot. (3) It can be seen that the temperature of the corner does not drop extremely after the start of temperature control. At the same time, it is possible to adjust the temperature of the corner portion by manufacturing the heating conductor and adjusting the position of the interposition member 18 at the corner portion, thereby eliminating the need to remake the heating conductor. As a result, the development period and development cost can be greatly reduced. Furthermore, it is possible to cope with the case where the shape of the corner of the object to be heated changes depending on the lot or the material of the object to be heated changes. As a result, the development period and development cost can be greatly reduced.

  Next, an example of using the high-frequency heating apparatus 10 of the present invention (FIG. 10) to perform diffusion bonding and heating upset bonding of hollow materials of the same material having a quadrangular cross section through an amorphous metal will be described with reference to FIG. The diffusion bonding method with pressure upset has already been described in Patent Document 6. A description will be given according to this method except that the shape of the material is different.

  An amorphous metal 11-3 is sandwiched between the hollow materials 11-1 and 11-2 having a square cross section and set between the pressurizing devices 45 and 46. The heating conductor 6 of the high-frequency heating device of the present invention is placed on the outer periphery of the joining surface, and the clearances L of the four flat portions are the same, and the end surfaces of the hollow materials 11-1 and 11-2 are at the center of the heating conductor 6. (Fig. 12 (a)).

  Then, in the state of applying the axial force to the hollow materials 11-1 and 11-2 by the pressurizing devices 45 and 46 and holding the amorphous metal 11-3, the amorphous metal component is hollow in the high-frequency heating device of the present invention. Heating is performed to a temperature (set temperature) necessary for diffusing into the member (FIG. 12B).

  By maintaining the set temperature for a certain time after reaching the set temperature, and then pressurizing and deforming the bonded portion to increase the bonded interface area, a bonded surface with higher strength can be obtained (FIG. 12C).

DESCRIPTION OF SYMBOLS 1 High frequency power supply 5a, 5b Lead 6 Heating conductor 6a-6c 1st-3rd division | segmentation piece 7, 8 Connection member 9 O-ring 10 High frequency heating apparatus 11 To-be-heated object (metal member)
11a to 11d Corner portion 16a of object to be heated End portion 17a of third divided piece End portion 18 of first divided piece Intervening member (corner portion induction heating adjusting means)
21, 22 Clamp member (fastening means) that clamps the split pieces together
30 Clamp member (adjustment means) for clamping the bent portion of the third divided piece

Claims (6)

In the high-frequency heating apparatus that performs induction heating using a heating conductor formed in a quadrangular shape so as to surround a rectangular metal member in order to perform diffusion bonding / heating upset bonding of a rectangular metal member having a hollow cross section, The heating conductor of the shape is formed of a plurality of divided pieces, and a pair of leads connected to a high-frequency power source are connected to the ends of the adjacent divided pieces, and the ends of the other divided pieces are electrically connected to each other to form the heating conductor, the corners of the metallic member conducting the induced current along with the corner portions of the heating conductor formed by these split pieces, changing the distance from the corner of the metal member A high frequency heating apparatus comprising a corner induction heating adjusting means for adjusting the magnitude of an induced current excited in the coil.   The heating conductors are respectively connected to a pair of leads connected to a high-frequency power source, and a first divided piece and a second divided piece extending from a corner portion of the metal member along a side of the metal member; Connected to the ends of the divided piece and the second divided piece, formed in an L shape along the two sides of the metal member, and formed by a third divided piece, the ends of the first divided piece and the second divided piece And the end of the third divided piece are connected by fastening means, and the corner induction heating adjusting means is arranged between the end of the first divided piece, the end of the second divided piece, and the end of the third divided piece. The high-frequency heating device according to claim 1, wherein the high-frequency heating device is configured by an interposition member that is provided so as to be position-adjustable along the end portion and conducts the end portions. The first divided piece and the second divided piece include a linear main body portion that is bent from the lead and extends along the side of the metal member, and an end portion bent from the main body portion. The divided piece includes a straight portion extending along two sides of the metal member around the bent portion, and an end portion bent from the straight portion, and an end portion of the first divided piece and the second divided piece, The end of the third divided piece is formed in parallel, an interposition member is movably provided between the end portions, and the end portions are connected by the fastening means to fix the interposition member. 2. The high frequency heating apparatus according to 2 .   The bent portion of the third divided piece is formed in a U shape having a groove portion that is open on the inner peripheral side, and an interposition member that can conduct to the groove portion is provided so as to be adjustable in the depth direction of the groove portion. The high-frequency heating device according to claim 3, wherein induction heating adjusting means is configured.   A high-frequency heating device used in induction heating to perform diffusion bonding / heating upset bonding of a rectangular metal member having a hollow cross section, the high-frequency heating device comprising: a high-frequency power source for supplying a high-frequency current; A heating conductor for passing a high-frequency current supplied from a high-frequency power source, and the heating conductor is arranged around the metal member and can induction-heat the metal member. Each lead member is connected, and each lead member guides a high-frequency current from the high-frequency power source side to the heating conductor, and the heating conductor allows a plurality of divided pieces and fastening and disassembling of the divided pieces. The heating conductor has a rectangular annular structure in which the fastening portion of each divided piece and the portion to which the lead member of the heating conductor is connected are arranged at the four corners. Possible The existing member is disposed between the divided pieces at the fastening portion of each divided piece, and each of the interposed members is sandwiched by the divided pieces at an arbitrary position in the direction of advancement and retreat with respect to the inside of the annular shape of the heating conductor. A high-frequency heating device characterized in that it is possible.   At least one of the divided pieces of the heating conductor has a bent portion forming one corner of the annular square, and the bent portion has a groove portion having a substantially U shape with the opening side facing the inside of the square. And an interposition member that is movable along the depth direction of the groove portion and that is conductive is disposed in the groove portion, and the adjusting means that fixes the interposition member disposed in the groove portion to the bent portion The high-frequency heating apparatus according to claim 1, wherein the high-frequency heating apparatus is provided.