JPH1126149A - High frequency induction heating coil and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively and easily manufacture a high frequency induction heating coil having the high useful life and dimensional accuracy. SOLUTION: A conductive square column or the like having a dimension corresponding to an outside dimension of a product coil is prepared. The product coil is composed of a conductive member which is formed of a square column or the like and extends in the long size, cover members 28a and 28b to block up a cooling water long groove formed in a long size side wall part of the conductive member, square pipes 30a, 30b, 32a and 32b for a cooling water introducing-deriving tube body and a plate material 35 interposed in a space 34. The cooling water long groove communicates with the square pipes 30a, 30b, 32a and 32b for a cooling water introducing-deriving tube body, and a long groove 26 to arrange and heat a heating object work is cut/formed in the long size side wall part of the conductive member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency induction heating coil and a method of manufacturing the same, and more particularly, to a so-called high-frequency induction heating coil having no welding portion on a heating surface of a coil facing a workpiece.
The present invention relates to a high-frequency induction heating coil and a method for manufacturing the same.

[0002]

2. Description of the Related Art In general, as a method of manufacturing a high-frequency induction heating coil, a method of brazing all components of a coil including a surface facing a work and assembling the entire coil is widely adopted.

Japanese Patent Publication No. 4-16293 discloses that a coil manufactured by such a method of manufacturing a high-frequency induction heating coil by brazing has (1) a limit in dimensional accuracy.
(2) It is pointed out that the life is short.

In order to overcome the inconveniences of (1) and (2), Japanese Patent Publication No. Hei 4-16293 discloses that a cylindrical copper solid material is cut into a portion substantially facing the work. There has been proposed a "method for manufacturing a high-frequency induction heating coil" in which a brazed joint is not exposed.

[0005] However, the aforementioned Japanese Patent Publication No. 4-16293.
The method disclosed in Japanese Patent Publication No. JP-A No. 10-27139 is to cut out from a columnar material, so the durability of the coil itself is improved, but the number of processing steps is increased, and along with this, the processing dimensional accuracy is maintained. Difficult to do. In other words, since there are many portions where the material is cut and removed, the product yield of the material cannot be said to be good, and there is a drawback that the manufacturing time is increased and the manufacturing cost is increased.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in consideration of such problems, and reveals a joining portion by brazing to a heating surface of a coil facing a workpiece subjected to induction heating at a high temperature. To improve the durability,
An object of the present invention is to provide a high-frequency induction heating coil which can be easily manufactured, has excellent quality, and can be manufactured at low cost, and a method for manufacturing the same.

[0007]

In order to solve the above-mentioned problems, a high-frequency induction heating coil according to the present invention comprises a conductive member extending in a long length, and first and second conductive members. First and second lid members fixed to a long side wall portion, and a set of cooling water introduction / discharge tubes fixed to the first and second short side wall portions of the conductive member And an insulating member interposed in a space formed in one of the first and second short side walls of the conductive member.
First and second cooling water passages are provided in the first and second long side walls, and the first and second cooling water passages are liquid-tightly closed by the first and second lid members. The pair of cooling water inlet / outlet tubes communicates with the first and second cooling water passages, respectively, and the first and second lid members of the conductive member are fixed to the first and second cooling water passages. It is characterized in that a work to be heated is arranged on a third long side wall portion excluding the first and second long side wall portions and a long groove for heating is formed by cutting.

Normally, such a high-frequency induction heating coil has a welded portion, such as a brazing process, on a coil surface facing a high-temperature work, due to a manufacturing method. However, in the coil according to the present invention, the long groove for arranging and heating the work to be heated is formed by cutting the long side wall portion of the conductive member, and there is no such a welded portion. It can have a long life with little need for replacement.

In the high-frequency induction heating coil according to the present invention, preferably, first and second saddle-shaped protrusions are provided at both long end portions of the conductive member, and the first saddle-shaped protrusion is provided. The first and second cooling water passages extending from the portion through the first and second long side wall portions of the conductive member to the second saddle-shaped protrusion; and providing the first and second cooling water passages. The cooling water passage 2 has a structure in which communication is interrupted by first and second partition walls provided in the first and second saddle-shaped projections.
The lead-out tube has a structure communicating with the first and second cooling water passages at the first and second saddle-shaped protrusions, and the conductive member is provided on the first or second short side wall portion of the conductive member. A structure in which a space is formed along the longitudinal direction of the conductive member and an insulating member is inserted into this space, and a set of cooling water introduction / discharge tubes also serves as a power supply conductor for supplying high-frequency current It can be.

Further, the method of manufacturing a high-frequency induction heating coil according to the present invention is characterized in that a high-frequency induction heating coil is formed by using a conductive prism or a plate having a dimension corresponding to an outer dimension corresponding to a diameter and a length of a work to be heated. A method for manufacturing a heating coil, comprising: (1) selecting and positioning a prism or plate having a desired size as a workpiece; (2)
Forming a first and second saddle-shaped protrusions at both ends of the workpiece by cutting away a central portion of the workpiece in a longitudinal direction along the longitudinal direction; First and second long grooves for cooling water are formed on first and second long side walls of the workpiece so as to reach the second saddle-shaped protrusion from the second protrusion, with a partition wall interposed therebetween. And removing a part of the wall portion obtained by cutting the central portion into a long length, so as to reach the second saddle-shaped convex portion from the first saddle-shaped convex portion. Forming an arc-shaped long groove with the third side wall portion of the workpiece opened, and (3) further closing the cooling water long groove with first and second lid members. And connecting a cooling water introduction / extraction tube also serving as a power supply conductor to the first and second cooling water long grooves, and partitioning the one saddle-shaped convex portion. Wherein the forming a space, the implement in any order to.

According to the method of manufacturing a high-frequency induction heating coil of the present invention, a prism or a wide plate material suitable for the coil external dimensions corresponding to the dimensions of the work to be heated is used as a material in order to make the coil external appearance flat. Since the number of parts to be cut is greatly reduced, the number of processing steps is reduced, and it is easy to maintain the processing dimensional accuracy.

Further, in the method for manufacturing a coil according to the present invention,
Preferably, the step of forming the first and second long grooves for cooling water includes a step of forming a first groove on the first and second long side walls of the workpiece.
Forming a linear groove so as to extend from the saddle-shaped projection to the second saddle-shaped projection; and forming the straight-line groove between corners of the first and second saddle-shaped projections with a partition wall interposed therebetween. Forming a circular arc-shaped groove communicating with the groove in the shape of a circle, and forming a part of a corner of the first and second saddle-shaped protrusions as a radius cutout. The work material may be selected such that at least the thickness of the conductive prism or the plate material is equal to the height dimension of the high-frequency induction heating coil to be manufactured, among the standard dimensions of the length, width and thickness. it can.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a high-frequency dielectric heating coil according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a prism 10 made of a conductive material as an example of a material for manufacturing a coil according to the present invention. The material of the prism 10 is an oxygen-free copper plate (JIS H3100 C1020), and the height H is about 40 here.
mm, the width W was about 60 mm, and the length L was about 420 mm. As shown in FIG. 2 (a), the dimensions of the oxygen-free copper cut plate match the external dimensions of an induction heating coil as a finished product shown by hatching and are commercially available. Therefore, the above-mentioned respective surfaces in the height H and width W directions do not require any processing other than the necessary portions. Therefore, the product yield as a prism material is high as described later. Also, the external dimensions of the coil need to be various dimensions corresponding to the dimensions of the workpiece to be heated, but commercially available plate materials have a wide selection, so that a suitable one can be easily selected. it can. The material of the prism 10 is not limited to copper, and may be any good electric conductor. More preferably, for example, the oxygen-free copper cut plate or the tough pitch copper cut plate can be used. Further, even if there is no commercially available prism 10 having a size that exactly matches the external dimensions of the induction heating coil, if a prism 10 having a size as close as possible to the size is selected, the necessary minimum A prism 10 having a desired size can be obtained by cutting or the like.

For reference, FIG. 2B shows a cross section of the cylindrical material 2 when an induction heating coil is to be manufactured using the cylindrical material described in Japanese Patent Publication No. 4-16293. In this case, in order to obtain the same dimensions as those of the coil of the present invention shown in FIG. 2 (a), all the other portions are cut except for the hatched section of the cylindrical material 2 of FIG. 2 (b). There is a need. This is, as will be readily appreciated, a very large cut area. Therefore, the product yield of the columnar material 2 is extremely poor.

Next, as shown in FIG.
A portion corresponding to the saddle-shaped protrusions at both ends of the coil in the longitudinal direction,
That is, the two-dot chain line portion is cut into a rectangular parallelepiped shape except for the end portions 14a and 14b. When the prism 10 having the above dimensions is used, the cutting depth in the H direction is the height h shown in FIG.
With the depth left. In this way, the ends 14a, 1
The saddle-shaped recess 16 is formed as shown in FIG. The portion cut and removed from the prism 10 to form the saddle-shaped recess 16 has a depth (Hh) of about 20 mm,
The width w was about 60 mm and the length 1 was about 380 mm.

Next, the corners of the saddle-shaped projections 14a, 14b are cut by concave round end milling, so that the corners are so-called rounded, and the corner cuts 15a, 15b,
15c and 15d are formed. In this case, the curvature of the radius cutouts 15a to 15d is about 14 mm and the length is about 20 m.
m. In addition, in FIG.
15d is visually recognized as a straight line, but is actually a curved shape as described above.

Further, as shown in FIG.
After the saddle-shaped recess 16 is formed, a first long groove 18a and a second long groove are provided along the longitudinal direction of the remaining portion immediately below the saddle-shaped protrusions 14a and 14b. 18b is formed by cutting. These long grooves 18a, 18b
End milling is used for the formation. The depth of these long grooves 18a and 18b is d.

Thereafter, the saddle-shaped protrusions 14a, 14b are formed in a direction perpendicular to the cutting direction of the first and second long grooves 18a, 18b, and communicate with the long grooves 18a, 18b. Grooves 20a, 20b, 22a, 22b are formed. In this case, the grooves 20a, 20b, 22a,
The depth of 22b is d which is the same as the depth of the long grooves 18a and 18b. In addition, between the grooves 20a and 20b, the grooves 22a and 2
First and second partition walls 24a and 24b are formed between 2b.

The machining for forming the grooves 20a, 20b, 22a and 22b is performed by a convex end milling by an NC machine so that the groove bottom forms a smooth curved surface.

Further, as shown in FIG.
On the other hand, an inverted U-shaped groove 25 whose lower surface, which is the third side wall portion, is formed so as to extend from the outside of one saddle-shaped protrusion 14a to the outside of the other saddle-shaped protrusion 14b. Since the top of the groove 25 extends sufficiently upward with respect to the height h of the prism 10, it is cut out along the longitudinal direction of the saddle-shaped concave portion 16 and has an arc shape penetrating in the longitudinal direction. Is formed.

Next, as shown in FIG.
20b, 22a, 22b and the long grooves 18a, 18b are closed by lid members 28a, 28b. As can be understood from FIG. 8, the lid members 28a and 28b have long portions 29a and 29b for closing the long grooves 18a and 18b, respectively.
And short portions 31a and 31b rising integrally from both ends thereof and substantially closing the radius portions of the radius notches 15a to 15d. Openings 33a, 33b are formed on the first and second partition walls 24a, 24b which are not closed by the short portions 31a, 31b.

Further, as shown in FIG.
On the b side, the openings 33a and 33b are closed,
Curved square pipes 30a, 30 as cooling water inlet / outlet pipes also serving as power supply conductors above the saddle-shaped protrusions 14b.
b is connected by a brazing process. On the other hand, a cooling water inlet / outlet pipe also serving as a power supply conductor is provided above the other saddle-shaped protrusion 14a so as to close the openings 33a and 33b with the first partition wall 24a interposed therebetween. Square pipes 32a and 32b are similarly connected by brazing.

Finally, as shown in FIG. 10, a space 34 is formed by cutting the partition wall 24b of the one saddle-shaped convex portion 14b, and a polytetrafluoroethylene plate material is formed in a gap between the spaces 34 as an electrically insulating member. Insert 35.

When using the coil, the square pipe 30a
And 32a and the square pipes 30b and 32b are connected to cooling water introduction pipes (not shown), respectively, and lead wires (not shown) are provided on both sides of the prism 10 on the saddle-shaped protrusion 14b side with the plate 35 interposed therebetween. ) Are electrically connected. A groove 2 through which a work (not shown) penetrates the coil in the longitudinal direction.
5 and a power supply is introduced to heat the high frequency induction heating coil. On the other hand, from the square pipe 30a to the square pipe 3
Cooling water is introduced into 2a through the long groove 18a and the groove 22a, and the coil itself is cooled. The cooling water from the square pipe 30b to the square pipe 32b achieves the same function. At this time, when the conventional coil is used, the brazed portion of the surface portion defining the groove of the coil facing the heated work deteriorates due to repeated use for a long time, and the leakage of the cooling water is reduced. This causes the life of the coil to be shortened. However, when the high-frequency induction heating coil according to the present invention is used, the problem is solved because there is no brazed portion on the surface defining the groove of the coil facing the workpiece.

In this embodiment, the central portion of the prism 10 is cut off to be long along the longitudinal direction, and the first and second saddle-shaped protrusions 14 are provided at both ends of the prism 10.
forming first and second long side walls of the prism 10 so as to extend from the first saddle-shaped projection 14a to the second saddle-shaped projection 14b. 24a, 2
4b, the first and second long grooves for cooling water 18a, 18b
And removing a part of the wall portion obtained by cutting the central portion into a long length to reach from the first saddle-shaped protrusion 14a to the second saddle-shaped protrusion 14b. Thus, the step of forming the arc-shaped long groove 26 in which the third side wall of the prism 10 is opened has been described as being performed in this order, but this step is not limited to this order. The order can be arbitrarily changed.

A step of closing the cooling water slots 18a, 18b with first and second lid members 28a, 28b, and a power feeding conductor in the first and second cooling water slots 18a, 18b. A step of connecting the square pipes 30a, 30b, 32a, and 32b as pipes for cooling water introduction and discharge, and a partition wall 2 of the one saddle-shaped projection 14a or 14b;
Forming a space 34 in 4a or 24b.
Although the steps have been described as being performed in this order, this step is not limited to this order, and this order can be arbitrarily changed.

[0028]

As described above, according to the high-frequency induction heating coil and the method of manufacturing the same according to the present invention, since there is no brazing portion on the coil surface facing the high-temperature work, the brazing portion deteriorates. Thus, it is possible to provide a long-life coil that requires almost no coil replacement due to water leakage.

Further, since a prism or a wide plate material suitable for the coil outer dimensions corresponding to the dimensions of the work to be heated is used as a material in advance, a portion requiring cutting processing for forming the coil outer shape is greatly reduced. As a result, the effect that the product yield of the material is high is achieved.

Further, the number of processing steps for manufacturing the coil is reduced, and the effect of easily maintaining the processing dimensional accuracy is achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a prism that is a material of a high-frequency induction heating coil according to the present invention.

FIG. 2 is a side view of a short axis side of a coil material, and FIG. 2A is a diagram illustrating a main body (hatched portion) and a cut portion of a product coil cut out from a prism according to the present embodiment. FIG. 2B is an explanatory view showing a main body (hatched portion) and a cutout portion of a product coil to be cut out using a columnar material according to a conventional example.

FIG. 3 is a perspective view of a prism for explaining a step of forming a saddle-shaped recess by the manufacturing method according to the embodiment.

FIG. 4 is a perspective view of a prism for explaining a step of performing a rounding process on a fillet portion of a saddle-shaped protrusion at both axial ends after forming a saddle-shaped recess.

FIG. 5 is a perspective view of a prism for explaining a step of forming a long groove for cooling water on both long side walls of the prism material.

FIG. 6 is a perspective view of a prism for explaining a step of forming a saddle-shaped convex groove communicating with the cooling water long groove.

FIG. 7 is a perspective view of a prism for explaining a step of forming a groove penetrating in a longitudinal direction.

FIG. 8 is a perspective view of a prism for explaining a step of closing each cooling water groove with a lid member.

FIG. 9 is a perspective view of a prism for explaining a process of attaching power supply conductors and respective pipes for introducing and leading out cooling water to the saddle-shaped convex portions at both ends in the axial direction.

FIG. 10 is a perspective view of a prism for explaining a step of forming a space in one of the saddle-shaped protrusions at both ends in the longitudinal direction.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Square pillar 14a, 14b ... Saddle-shaped convex part 15a-15d ... Round notch part 16 ... Saddle-shaped concave part 18a, 18b ... Long groove 20a, 20b, 22a, 22b ... Saddle-shaped convex part groove 24a, 24b ... Partition wall 25 ... Groove 26 ... Long groove 28a, 28b ... Lid member 29a, 29b ... Long part 30a, 30b, 32a, 32b ... Square pipe 31a, 31b ... Short part 35 ... Plate material

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kazuhiro Misawa 19 Matsuyamacho, Moka-shi, Tochigi Pref. Honda Motor Co., Ltd.

Claims (9)

[Claims] A conductive member extending in a long direction; first and second lid members fixed to first and second long side walls of the conductive member; and the conductive member. A pair of cooling water introduction / discharge tubes fixed to the first and second short side wall portions, and formed on one of the first and second short side wall portions of the conductive member. An insulating member interposed in a space defined by the first and second cooling water passages, the first and second long side wall portions being provided with first and second cooling water passages; The first and second lid members are liquid-tightly closed by the first and second lid members, and the pair of cooling water inlet / outlet tubes communicates with the first and second cooling water passages, respectively. The work to be heated is arranged and heated on a third long side wall except for the first and second long side walls to which the first and second lid members of the sex member are fixed. A high frequency induction heating coil characterized by forming a long groove by cutting. 2. The high-frequency induction heating coil according to claim 1, wherein first and second saddle-shaped protrusions are provided on both long end portions of said conductive member, and said first saddle-shaped protrusion is provided from said first saddle-shaped protrusion. The first and second cooling water passages are provided to reach the second saddle-like projections through the first and second long side walls of the conductive member, and the first and second cooling waters are provided. The high-frequency induction heating coil is characterized in that the water passage is interrupted by first and second partition walls provided in the first and second saddle-shaped projections. 3. The high-frequency induction heating coil according to claim 1, wherein said set of cooling water introduction / discharge tubes is formed by first and second saddle-shaped projections. A high-frequency induction heating coil which is in communication with a water passage. 4. The high-frequency induction heating coil according to claim 1, wherein the first or second short side wall portion of the conductive member extends along a longitudinal direction of the conductive member. A high-frequency induction heating coil characterized by forming a space by inserting an insulating member into the space. 5. The high-frequency induction heating coil according to claim 1, wherein a pair of cooling water introduction / extraction tubes also serves as a power supply conductor for supplying a high-frequency current. High frequency induction heating coil. 6. A method for manufacturing a high-frequency induction heating coil using a conductive prism or a plate having dimensions corresponding to the outer dimensions corresponding to the diameter and length of a workpiece to be heated, comprising: 1) A prism or a plate having a desired size is selected and positioned as a workpiece. (2) Then, a central portion of the workpiece is cut long along the longitudinal direction of the workpiece, and the workpiece is cut. Forming first and second saddle-shaped protrusions at both ends of the material, respectively; and forming the first and second saddle-shaped protrusions from the first saddle-shaped protrusion to the second saddle-shaped protrusion. A step of forming first and second long grooves for cooling water with a partition wall interposed between the two long side walls, and a part of the wall obtained by cutting off the central portion to be long. And removing the third side of the workpiece from the first saddle-shaped protrusion to the second saddle-shaped protrusion. Forming an arc-shaped long groove having an open portion; and (3) further closing the cooling water long groove with first and second lid members; Connecting the cooling water inlet / outlet pipe serving also as a power supply conductor to the second cooling water long groove, and forming a space in the partition wall of the one saddle-shaped convex portion; A method for manufacturing a high-frequency induction heating coil, which is performed. 7. The method of manufacturing a high-frequency induction heating coil according to claim 6, wherein the step of forming the first and second long grooves for cooling water includes the first and second long sections of the workpiece. Forming a linear groove on the side wall portion from the first saddle-shaped protrusion to the second saddle-shaped protrusion, and forming a partition wall at a corner of the first and second saddle-shaped protrusions. Forming a circular arc-shaped groove communicating with the linear groove across the groove. 8. A method for manufacturing a high-frequency induction heating coil according to claim 6, further comprising the step of forming a part of a corner of the first and second saddle-shaped protrusions as a radius cutout. A method for producing a high-frequency induction heating coil, characterized in that: 9. The method for manufacturing a high-frequency induction heating coil according to claim 6, wherein the workpiece has a length, width, and thickness of the conductive prism or plate. A method for manufacturing a high-frequency induction heating coil, wherein at least the thickness is selected so as to match the height of the high-frequency induction heating coil to be manufactured.