JPH0719657B2 - Method for manufacturing semi-open saddle type high frequency heating coil for crankshaft - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a half open saddle type high frequency heating coil for a crankshaft for heating a journal or a pin which is a hardened portion of a crankshaft (hereinafter referred to as a heating coil, a half for a crankshaft). Open saddle type high frequency heating coil).

[0002]

2. Description of the Related Art A conventional technique will be described below with reference to the drawings. When heating the journal or pin that is the hardened part of the crankshaft, the hardened part has a columnar shape, and after the heating coil is placed close to the hardened part,
A high frequency current is applied to this heating coil. First, the structure of this heating coil will be described.

FIG. 10 is a perspective view of a semi-open saddle type high frequency heating coil for a crankshaft manufactured by a conventional manufacturing method. As shown in FIG. 10, the heating coil 100 includes a conventional heating coil 300, a first coil piece 300A, a first coil piece 300A, and a first coil piece 300A.
A second coil piece 300B having the same shape as the coil piece 300A and arranged so as to face the first coil piece 300A, and an arc-shaped heating conductor 35 connecting the first coil piece 300A and the second coil piece 300B. It is provided with a coil piece and a pair of power supply conductors (not shown).

The first coil pieces 300A were connected in series.
The heating conductors 30 to 34 are wound in a rectangular shape, and the heating conductors 31 and 33 are substantially arcuate in a direction (circumferential direction of the hardened portion) perpendicular to the axial direction of the crankshaft (direction of arrow P) ( The conductors 31 and 33 are connected at one end to each other by a linear heating conductor 32 parallel to the axial direction of the crankshaft. One end of the heating conductor 30 parallel to the heating conductor 32 is connected to the other end of the heating conductor 31, and a heating conductor parallel to the heating conductor 32 is provided between the other end of the heating conductor 33 and one end of the heating conductor 35. Connected by 34.

The second coil piece 300B is provided with heating conductors 36-40 corresponding to the heating conductors 30-34 of the first coil piece 300A. The pair of power supply conductors (not shown) are the other end 30m of the heating conductor 30 and the end 4 of the heating conductor 40 corresponding to the other end 30m.
It is connected to 0m. The space 300D between the heating conductors 30 and 36 and the space between the heating conductors 34 and 40
300E is a space for arranging a spacer (not shown) for keeping the space between the heating coil 300 and the hardened part constant. The heating conductors 31, 33, 3 formed in an arc shape
The diameters of 5, 37 and 39 are all the same.

In order to manufacture the heating coil 300, first, a hollow conductive tube made of copper or the like having a square or rectangular cross section is cut and bent to form the heating conductors 30 to 30.
40 and the power supply conductor. Next, these conductors are connected by brazing to complete the heating coil 300.

[0007]

However, the above heating coil 300 thus manufactured has the following problems. That is, the heating conductors 30 and 31, 31 and 32, 32
33, 34 and 35, 35 and 36, 36 and 37 are connected by brazing parts 311 to 317, respectively. Also a heating conductor
37 and 38 are also connected by a brazing part (not shown). Furthermore, the heating conductors 38 and 39, 39 and 40 are connected by brazing parts 318 and 319, respectively. The power supply conductor (not shown) and the heating conductors 30 and 40 are also connected by a brazing portion (not shown).

When a high-frequency current is passed through the heating coil 300, the high-frequency current flows mainly in the portion of the heating coil 300 facing the hardened portion and the portion close to the hardened portion. Since a portion facing the hardened portion and a portion close to the hardened portion are formed in this manner, a high-frequency current flows in such a brazed portion.

Therefore, when the heating coil 300 is used for a long period of time, such a brazed portion is deteriorated, the heating coil 300 is damaged, the cooling liquid of the heating coil 300 leaks, and the heating coil 300 is exposed to the hardened part. Contact them.

The present invention was devised in view of the above circumstances, and there is no brazing portion in the portion facing the hardened portion or in the portion close to the hardened portion, and therefore does not deteriorate even after long-term use. It is an object to provide a method of manufacturing a heating coil.

[0011]

In order to solve the above problems, a method for manufacturing a half-open saddle type high frequency heating coil for a crankshaft according to the present invention is provided on a peripheral surface of a pin or a journal which is a hardened portion of a crankshaft. A high-frequency heating coil that is placed close to and straddles and heats a hardened part,
The first and second coil pieces of the same shape which are wound in a substantially rectangular shape are connected to one ends of the open ends provided on the opposite sides of the coil pieces and on the substantially axial side of the crankshaft. A third coil piece provided in a direction substantially perpendicular to the direction, the first and second coil pieces are connected in series by the third coil piece, and the first to third coil pieces have grooves. A method for manufacturing a semi-open saddle type high frequency heating coil for a crankshaft, comprising a substantially gutter-shaped main body formed by drilling and a flat plate-shaped lid brazed to the main body so as to close the groove. Then, the first step of adhering the cylindrical second metal material to the peripheral surface of the columnar first metal material, and shaving the second and first metal materials from the outer peripheral surface side of the second metal material, Forming a second metal material on the lid,
The second step of forming the main body in which the groove is not formed on the peripheral surface of the first metal material, and after the second step, heating the first and second metal materials, and then the first metal material and the second metal material. A third step of separating the metal material, a fourth step of cutting the surface of the first metal material to form the groove in the main body after the third step, and a fourth step
After the step, a fifth step of forming a cylindrical through hole around the axis of the first metal material in the first metal material, and the lid obtained in the second step are brazed to the heating conductor to groove the heating conductor. The sixth to block
The process is included.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 8 are drawings for explaining the present embodiment, FIG. 1 is a perspective view of a completed heating coil (excluding a power supply conductor), and FIG. 2 is a first and a first step after a first step. 2 is a perspective view of the metal material, FIG. 3 is a perspective view of the first and second metal materials after the second step, and FIG. 4 is a perspective view of the first metal material after the third step.
5 is a perspective view of the second metal material after the third step, and FIG. 6 is a fourth view.
FIG. 7 is a perspective view of the first metal material after the process, FIG. 7 is a perspective view of the first metal material after the fifth process, FIG. 8 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 9 is manufactured by this embodiment. It is an explanatory view of the state where the above-mentioned heating coil was placed in the hardened part.

The heating coil 100 (excluding the power supply conductor) shown in FIG. 1 manufactured by the method of this embodiment is
Regarding the outer diameter shape, the conventional heating coil described in FIG.
Same as 300. As shown in FIG. 9, the heating coil 100 is a part to be hardened 50 which is a peripheral surface of a crankshaft journal 500 (which may be a pin) which rotates about a shaft 502.
Used to heat 1.

The heating coil 100 includes a first coil piece 100A, a first coil piece 300A, a first coil piece 300A, a second coil piece 300B, and heating conductors 30-40 which are equivalent to or correspond to the first coil piece 300A, the second coil piece 300B, and the heating conductors 30 to 40, respectively. Two coil pieces 100B and heating conductors 10 to 20 are provided. However, the heating conductor 15 is the third coil piece 100C that is equivalent to or corresponds to the third coil piece that is the heating conductor 35 of the heating coil 300. As with the heating coil 300, one end 10m of the heating conductor 10 and the end 20m of the heating conductor 20 are
A pair of power supply conductors (not shown) are connected to each other by brazing.

The heating coil 100 comprises a heating coil between the heating conductors 10 and 16,
And between the heating conductors 14 and 20, there are spaces 100D and 100E for disposing spacers. In addition, 100F
And 100G are voids formed by the first coil piece 100A and the second coil piece 100B, respectively.

Next, the sectional structure of the heating conductors 10 to 20 will be described. Since all the heating conductors 10 to 20 have the same sectional structure, they will be described with reference to FIG. 8 showing the sectional structure of the heating conductor 11. The heating conductor 11 is a conductor formed in a substantially gutter shape by forming a groove 11f, has a substantially U-shaped cross section, and has a pair of parallel side plates 11c and lower ends of the side plates 11c. A main body 11a having a flat plate-like bottom plate 11d integrally formed with both side plates 11c, and a flat plate-like lid 21 attached to the upper end surface 11e of the main body 11a by brazing 111 so as to close the opening 11g of the main body 11a. It has and. Therefore, the main body 11a and the lid 21 form a hollow portion 11h. The lid 21
Is integrally formed with the lid of another heating conductor described below.

Like the heating conductor 11, the heating conductors 10, 12-20
Also has main bodies 10a, 12a to 20a, respectively, and the openings of the main bodies are closed by a lid 21 common to all the main bodies. The heating conductors 11, 13, 15, 17, 19 formed in an arc shape have the same diameter.

The method of manufacturing the heating coil 100 will be described below. First, as the material for each heating conductor of the heating coil 100,
Cylindrical first metal material made of good conductive metal (eg copper) 1
Prepare (hereinafter also simply referred to as metal material 1). The diameter of the metal material 1 is selected to be equal to the diameter of the heating conductor formed in an arc shape, for example, the diameter of the upper end surface 11e of the main body 11a of the heating conductor 11. Also, the axial length of the metal material 1 is selected to be about 1.3 times the width H (Fig. 1) of the completed heating coil 100.

Next, a cylindrical second metal material 2 (hereinafter also simply referred to as metal material 2) whose inner diameter is equal to the diameter of the metal material 1 and whose thickness is equal to the thickness of the lid 21 is the same material as the metal material 1. 2) is bonded to the peripheral surface of the metal material 1 with an adhesive such as Arontite (trade name) as shown in FIG. 2 (first step). The axial length of the metal material 2 is selected to be equal to the width H of the completed heating coil 100. And
The metal materials 1 and 2 are adhered with one side 1a of the metal material 1 and the end of the metal material 2 aligned. Therefore, metal material
A peripheral surface 1c not covered with the metal material 2 appears on the peripheral surface on the side surface 1a side on the other side of 1. Two heating coils 100 can be manufactured from these metal materials 1 and 2. In FIGS. 3, 4, 6 and 7 described below, for convenience of explanation and understanding, the metal material 1 is illustrated by omitting a portion having the peripheral surface 1c as the peripheral surface.

Next, the center of one side surface 1a of the metal material 1 is supported by a center (not shown), and the peripheral surface 1c is gripped by a chuck (not shown). By heating 1 and 2 by milling at the same time as shown in FIG.
0 spaces 100D, 100E, voids 100F, 100G and spaces between two heating coils 100 (spaces 100J, 1 in FIG. 3)
00K) to form. However, the diameter of the arc of the one-dot chain line 1b on the side surface 1a of the metal material 1 is the arc-shaped heating conductor, for example, the heating conductor.
11 is a circle with a diameter equal to the diameter of the bottom surface of the bottom plate 11d of the main body 11a, the space 100D, 100E and the void 100F and
100G is cut deeper than the chain line 1b, and spaces 100J and 100K are cut slightly shallower than the chain line 1b (second step).

After that, the metal materials 1 and 2 are put into an electric furnace and heated to weaken the adhesive force of the adhesive agent for bonding the metal materials 1 and 2, and then the metal material 2 is removed from the metal material 1. Remove (3rd step). Then, the metal material 1 shown in FIG. 4 and the metal material separated into two pieces shown in FIG.
2 and The metal material 2 separated into these two pieces becomes the lid 21 of the heating coil 100.

Next, as shown in FIG. 6, the grooves 10f to 20f of the heating conductors 10 to 20 are cut on the peripheral surface of the metal material 1 to form the main bodies 10a to 20a of the heating conductors 10 to 20 ( (4th step)
. After that, when a cylindrical through hole having a dashed-dotted line 1b as a peripheral line of the cross section is formed in the metal material 1 by a lathe or the like, as shown in FIG. 7, they are connected by a thin plate-shaped connecting portion 1e. An integrally formed body 10a of individual heating coils 100
~ 20a can be obtained (fifth step).

Next, as shown in FIGS. 1 and 8, the lid 21 is brazed so as to close the openings of the main bodies 10a to 20a of the heating coils 100 (sixth step). After this, the peripheral surface of metal material 1
The part with 1c as the peripheral surface is cut and removed from the other metal material 1. Then, two heating coils 100 are obtained by cutting the end portion 1d (FIG. 7) of the connecting portion 1e of the two heating coils 100. Finally, one end of the heating conductor 10
Manufacture of the heating coil 100 is completed by brazing a pair of power supply conductors (not shown) to 10 m and the end portion 20 m of the heating conductor 20, respectively.

In the above embodiment, the case where two heating coils 100 of the same size are manufactured at the same time has been described.
It is of course also possible to manufacture two heating coils of different sizes at the same time.

[0025]

As described above, the method of manufacturing the semi-open saddle type high frequency heating coil for crankshaft according to the present invention,
A high-frequency heating coil that is arranged close to the hardened portion of a crankshaft so as to straddle the peripheral surface of a pin or a journal and that heats the hardened portion. The high-frequency heating coil has the same shape and is wound in a substantially rectangular shape. A second coil piece and a third coil piece that is provided in a direction substantially perpendicular to the direction in which the opposite ends of the coil pieces are connected to each other and one ends of the open ends provided on the substantially axial side of the crankshaft are connected to each other. And the first and second coil pieces are connected in series by the third coil piece, and the first to third coil pieces are substantially gutter-shaped bodies formed by forming grooves. A method of manufacturing a semi-open saddle type high frequency heating coil for a crankshaft, comprising: a flat lid brazed to the main body so as to close the groove; Cylindrical second
The first step of adhering the metal material, the second and first metal materials are cut from the outer peripheral surface side of the second metal material to form the second metal material on the lid, and the first metal material A second step of forming the main body in which the groove is not formed on the peripheral surface;
After the step, the first and second metal materials are heated, and then the third step of separating the first metal material and the second metal material, and after the third step, the surface of the first metal material is ground. A fourth step of forming the groove in the main body, and a first metal material after the fourth step,
Including a fifth step of forming a cylindrical through hole centered on the axis of the first metal material, and a sixth step of brazing the lid obtained in the second step to the heating conductor to close the groove of the heating conductor. There is.

Therefore, according to the manufacturing method of the present invention, since the lid and the main body of the heating conductor forming the heating coil can be processed and formed at the same time, the manufacturing process of the heating coil is simplified, and the manufactured heating is performed. The heating coil manufactured by the manufacturing method of the present invention does not deteriorate even if it is used for a long period of time, because there is no brazing part in the part of the coil facing the hardened part and in the part close to the hardened part.

[Brief description of drawings]

FIG. 1 is a perspective view of a heating coil (excluding a power supply conductor) manufactured according to an embodiment of the present invention.

FIG. 2 is a perspective view of the first and second metal materials after the first step of the embodiment of the present invention.

FIG. 3 is a perspective view of the first and second metal materials after the second step of the embodiment of the present invention.

FIG. 4 is a perspective view of the first metal material after the third step of the embodiment of the present invention.

FIG. 5 is a perspective view of the second metal material after the third step of the embodiment of the present invention.

FIG. 6 is a perspective view of the first metal material after the fourth step of the embodiment of the present invention.

FIG. 7 is a perspective view of the first metal material after the fifth step of the embodiment of the present invention.

8 is a cross-sectional view taken along the line AA of FIG.

FIG. 9 is an explanatory diagram showing a state in which the heating coil manufactured according to the embodiment of the present invention is placed on the hardened portion.

FIG. 10 is a perspective view of a conventional half-open saddle type high frequency heating coil for a crankshaft.

[Explanation of symbols]

 1 First metal material 2 Second metal material 10a to 20a Main body 10f to 20f Groove 21 Lid 100 Heating coil 100A 1st coil piece 100B 2nd coil piece 100C 3rd coil piece 500 Journal 501 Hardened part

Claims (1)

[Claims] 1. A high-frequency heating coil, which is disposed close to a hardened portion of a crankshaft so as to straddle a peripheral surface of a pin or a journal and heats the hardened portion, and has the same shape and is wound in a substantially rectangular shape. The first and second coil pieces are connected to each other, and one ends of the open ends provided on the sides of the coil pieces which are opposed to each other and which are substantially axial sides of the crankshaft are connected to each other, and the first and second coil pieces are provided in a direction substantially perpendicular to the direction. And a third coil piece, the first and second coil pieces are connected in series by the third coil piece, and the first to third coil pieces are formed by forming a groove. A method for manufacturing a semi-open saddle type high frequency heating coil for a crankshaft, comprising: a substantially gutter-shaped main body; and a flat plate-shaped lid brazed to the main body so as to close the groove, wherein a cylindrical first metal Cylindrical second metal element on the peripheral surface of the material The first step of adhering the material, and the second and first metal materials are cut from the outer peripheral surface side of the second metal material to form the second metal material on the lid, and the circumference of the first metal material. A second step of forming the main body in which the groove is not formed on the surface, and after the second step, heating the first and second metal materials, and then separating the first metal material and the second metal material. A third step, and a fourth step after the third step to shave the surface of the first metal material to form the groove in the main body; and, after the fourth step, the first metal material is the first metal material. And a sixth step of closing the groove of the heating conductor by brazing the lid obtained in the second step to the heating conductor. Manufacturing method of half-open saddle type high frequency heating coil for crankshaft.