JP2611789B2 - High frequency induction heating coil and method of manufacturing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a high-frequency induction heating coil used for quenching or tempering a steel member and a method for manufacturing the same.

b. Conventional technology This type of high-frequency dielectric heating coil is formed in a shape corresponding to the shape of the object to be heated, and the coil is manufactured as follows.

That is, a semi-loop type high-frequency induction heating coil 1 as shown in FIG. 3 will be described as an example. When a pair of linear coil components 2 and 3 are provided, substantially semicircular coil components 4 and 5 are provided at both ends. By connecting the water supply pipe 6 and the drain pipe 7 to the coil component 5 integrally by brazing, the coil components 2, 3, 4,
A series of cooling water passages 8 were formed by connecting the hollow portions 5 to each other. The linear coil components 2, 3 and the substantially semicircular coil components 4, 5 are connected to each other at a substantially right angle. Brazing for connecting these components is shown in FIG. 4 or FIG. In the manner shown in FIG. 4th
The embodiment shown in the drawing is a so-called butt type, in which the end of the coil component 3 is brought into contact with the outer periphery of the hole 9a of the coil component 4, and the contact portion is brazed from the outside to the entire circumference. 5 is a so-called fitting method, in which the end of the coil component 3 is fitted into the hole 9b of the coil component 4. ,
This fitting portion is connected by brazing (a portion indicated by reference numeral B) from the outside to the entire circumference.

c. Problems to be Solved by the Invention However, when the brazing is performed by the fitting method as described above, the two members to be connected are machined with precision and the strength of the brazing is maximized. Molding must be performed to produce an optimum gap (about 0.1 to 0.2 mm), and high processing accuracy is required. Further, in any of the above-mentioned butt-joining method and fitting method, the brazing operation is very troublesome and the brazing joint area is small, so that sufficient joining strength may not be obtained. Was.

Further, in the butt system and the fitting system as described above, it is necessary to carefully perform brazing work so as not to leak water. However, even if care is taken, a brazing defect is likely to occur. . If there is any brazing failure,
Since water leakage occurs, there is a problem that the product becomes defective.

In addition, during high-frequency induction heating (at the time of energization), the temperature of the cooling water is increased as the cooling water moves toward the drain pipe 7 of the coil 1 (downstream side). In the conventional high-frequency induction heating coil 1 in which a series of cooling water passages 8 are formed by connecting the cooling water passages 8, the cooling water passages 8 are long, so that the coil cooling effect on the downstream side is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and has as its object that a high degree of processing accuracy is not required for coil components, brazing work can be performed extremely easily, and sufficient structural strength is provided. It is an object of the present invention to provide a high-frequency induction heating coil and a method for manufacturing the same, which can obtain a high temperature and can suppress a rise in the temperature of cooling water.

d. Means for Solving the Problems In order to solve the above problems, in the high-frequency induction heating coil according to the present invention, the outer surface of a plurality of pipe-shaped coil components each having a separate and independent cooling water passage. Is formed by integrally joining a part of the coil in a surface contact state, and a cooling water passage of each coil constituent member is formed at a place where the surface contact is made,
It is spaced apart by the tube walls of a pair of coil components that are superimposed on each other. Further, in the method for manufacturing a high-frequency induction heating coil according to the present invention, a plurality of pipe-shaped coils each formed into a shape corresponding to each part of a required coil shape, and each having a separate and independent cooling water passage. A brazing material is sandwiched between the outer surfaces of a part of each of the coil components to be joined to each other, and the brazing material is heated under this state, thereby brazing the plurality of coil components to a surface brazing state. To manufacture a high-frequency induction heating coil having a required shape.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a high-frequency induction heating coil 11 for heating the surface of a cylindrical object 10 to be heated. This coil
11 is composed of five divided coil components 12, 13, 14, 15, and 16. Each of the coil components 12 to 16 is made of a square pipe having a square cross section (thickness 1 to 5 mm) made of copper. ) Are integrally formed.

The coil components 12 and 13 have arc-shaped portions 12a and 13a, and a pair of linear portions 12b, 12c and 13b and 13c extending at both ends of the arc-shaped portions 12a and 13a, respectively. The linear portion 12b of the member 12 and the linear portion 13b of the coil component 13
Are arranged in parallel with each other, and these members 12, 13 are symmetrically arranged on the same horizontal plane. Further, the coil constituent members 14 and 15 include U-shaped portions 14a and 15a,
Bent portions 14b, 15b extended at the upper ends of the U-shaped portions 14a, 15a
, And are arranged opposite to each other at a predetermined interval below the pair of coil constituent members 12 and 13. The coil component 16 has an arc-shaped portion 16a and a pair of L-shaped portions 16b and 16c extending at both ends of the arc-shaped portion 16a. It is located below.

Thus, under a state where the pair of coil components 14, 15 is sandwiched between the upper coil components 12, 13 and the lower coil component 16, the joining end faces 17, 18 of the respective members 12 to 16 are provided. , 1
9, 20, that is, the joining end faces 17, 18, 19, 20 which are the outer surfaces of a part of the respective members 12 to 16, are joined by brazing, whereby the respective members 12 to 16 are integrally joined, and the high-frequency induction heating is performed. The coil 11 is constituted. Accordingly, the cooling water passages 21, 22, 23, 24, and 25 each formed of a hollow portion of each of the members 12 to 16 are separately independent from each other, and each of the cooling water passages 21 to 25 has a cooling water (not shown). Cooling water is supplied from the supply mechanism as shown by the arrow in FIG.

Next, a method of manufacturing the high-frequency induction heating coil 11 as described above will be described.

First, coil members 12 to 16 each formed of a square pipe are separately and integrally formed by machining a copper material. As shown in FIG. 2, for example, a plate-like silver brazing material 26 is sandwiched between the joining end surfaces (parts of the outer surfaces) 17 to 20 of the members 12 to 16 thus obtained, and are appropriately brazed in an electric furnace. Heated to a temperature, and these joining end faces 17 to 20 are simultaneously joined by brazing. When a gas welding machine is used without using an electric furnace, the brazing operation is performed sequentially on each of the joint end faces 17 to 20. By such a brazing operation, an integrated high-frequency induction heating coil 11 as shown in FIG. 1 is obtained.

According to the high-frequency induction heating coil 11 configured as described above,
Since the cooling water passages 21 to 25 of the five coil constituent members 12 to 16 are made independent from each other and the cooling water is caused to flow through each member 12 to 16 separately, each cooling water passage 21 to 25 is a conventional series of cooling water passages. The length is inevitably shorter than that of the passage. As a result, the temperature rise of the cooling water during high-frequency induction heating (during energization) can be suppressed low, and the coil can be cooled well.

Further, according to the above-described method for manufacturing the high-frequency induction heating coil 11, a plate-shaped silver brazing material is provided between the end faces of the two coil components.
Since the brazing method is adopted by sandwiching 26, the brazing operation can be easily performed. Furthermore, since the coil components are surface-bonded, the brazing bonding area can be increased (3 to 6 times or more as compared with the conventional case), and the wall thickness of the bonding portion is doubled. The mechanical strength such as the strength can be improved, and the durability (such as leakage of cooling water) can be improved. In addition, even if there is some variation in the dimensional accuracy of the end faces of the two coil components to be joined, sufficiently robust brazing can be performed reliably and easily.

As described above, one embodiment of the present invention has been described, but the present invention is not limited to the above-described embodiment, and various changes and modifications can be made based on the technical idea of the present invention.

For example, the overall shape of the high-frequency induction heating coil 11 and the number and shape of each coil component can be variously changed according to the shape of the object 10 to be heated. Further, the brazing material is not limited to the plate-shaped silver brazing material 26, and various other materials can be used. Further, the present invention is applicable not only to each coil constituent member configured as a square pipe having a square cross section, but also to those having various cross sections.

e. Effects of the Invention As described above, according to the high-frequency induction heating coil of the present invention, a plurality of pipe-shaped coil components each having a separate and independent cooling water passage are integrally connected to each other. Therefore, the length of the cooling water passage of each coil component is considerably shorter than that of a series of cooling water passages extending over the entire coil as in the conventional case. The temperature rise of the cooling water flowing in the coil component can be suppressed low. Moreover,
Since the coupling portion of the coil component is completely unrelated to the cooling water passage, there is no possibility of causing a problem such as water leakage.

Further, according to the method of manufacturing the high frequency induction heating coil of the present invention, the brazing is performed by sandwiching and heating the brazing material between the outer surfaces of a part of the separately formed coil component. The brazing joint area is much wider than before, and the thickness of the joint is doubled, so that a high-frequency induction heating coil with high mechanical strength and excellent durability can be obtained by an easy operation. Can be. In addition, since the coil components to be joined are joined together, a sufficiently firm brazing can be performed even if the dimensional accuracy of each coil component is somewhat poor.

[Brief description of the drawings]

1 and 2 show one embodiment of the present invention. FIG. 1 is an overall perspective view of a high-frequency induction heating coil, and FIG.
The drawings are partially exploded perspective views for explaining a method of manufacturing a high-frequency induction heating coil, and FIGS. 3 to 5 are for explaining a conventional example. FIG. 3 is an overall perspective view of the high-frequency induction heating coil. FIG. 4 is an enlarged sectional view of a main part showing a brazed state of the coil constituent member, and FIG. 5 is an enlarged sectional view of a main part showing another brazed state of the coil constituent member. 10: Heated object, 11: High-frequency induction heating coil, 12, 13, 14, 15, 16 ... Coil constituent member, 17, 18, 19, 20 ... Joined end face, 21, 22, 23, 24, 25 ... Cooling water passage, 26 ... Silver brazing material.

Claims (2)

(57) [Claims] An outer surface of a plurality of pipe-shaped coil components each having a separate cooling water passage is integrally connected in a face-to-face contact state. Wherein the cooling water passage is separated by a tube wall of a pair of coil components overlapped with each other. 2. A plurality of pipe-shaped coil components, each of which is formed into a shape corresponding to each part of a required coil shape and each has a separate and independent cooling water passage, are manufactured, and each of the coil-shaped members is to be connected to each other. By sandwiching the brazing material between the outer surfaces of a part of the coil component and heating the brazing material under this condition, the plurality of coil components are integrally joined in a surface brazed state to obtain a high-frequency induction having a required shape. A method for manufacturing a high-frequency induction heating coil, characterized by manufacturing a heating coil.