JPH059559A - High-frequency heating coil for oscillating hardening and oscillating hardening method using the above heating coil - Google Patents

Abstract

PURPOSE:To permit simultaneous hardening to the upper face of an axial part with an approximately barrel sectional shape and to the top faces of primary and secondary projected vein parts in the approximately orthogonal direction of the axis line on the axial part of both ends of the axial part by specificly arranging coils for hardening with plural specified shapes. CONSTITUTION:This coil 100 is provided with an axial part heating coil 50 of a semiopening saddle type formed so as to correspond to the shape on the upper face of the axial part and top face heating coils 10 and 20 of a semiopening type rounded into an approximately rectangular shape so as to correspond each to the shape of the top face of projected vein parts. These three coils are connected in a series, and the coil 50 is provided with approximately parallel semicircular-arc shaped three heating conductors in the circumferential direction formed along the circumferential direction of the axial part so as to stride over the axial part and a pair of rectilineal heating conductors 52 connecting each one end and each other end in the heating conductors 51. Then, the coils 50, 10 and 20 are arranged so as to correspond to the upper face of the axial part of each work and the upper faces of the primary and secondary projected vein parts, and while the coil 100 is oscillated in the axial direction of the axial part of the work, high frequency voltage is supplied to the cutting points 51a and 51b of the central conductor 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a rocking quenching high-frequency heating coil (hereinafter rocking heating coil) capable of simultaneously heating a plurality of hardened surfaces of a metal core of a rubber crawler of a caterpillar. (Also referred to as), and an oscillating quenching method using the oscillating heating coil.

[0002]

2. Description of the Related Art A conventional technique will be described below by taking, for example, the core metal 300 shown in a perspective view in FIG. 3 as a work. The core metal 300 has a substantially semi-cylindrical shaft part 330 having a substantially uniform cross-sectional shape, and parallel 1-piece parts formed integrally with the shaft part 330 at both ends of the shaft part 330 in a direction perpendicular to the axial direction of the shaft part 330. A pair of convex vein portions 310 and 320, and a pair of flat plate-shaped flat plate portions 340 formed integrally with the convex vein portions 310 and 320 on the outside of the convex vein portions 310 and 320 so as to project in the axial direction.
, 350 and.

FIG. 4 is a vertical cross-sectional view of the main part of the core metal 300. As shown in FIG. 4, the central portion 331 of the upper surface of the shaft portion 330 of the core metal 300 and the convex vein portion 310 (first When forming the hardened layers 332, 312 and 322 on the substantially flat top surface 311 of the first convex vein portion 311 and the substantially flat top surface 321 of the convex vein portion 320 (second convex vein portion), respectively, first, After quenching the central portion 331 with a high-frequency heating coil suitable for heating the central portion 331, heat the top surface 311 with a high-frequency heating coil suitable for heating the top surface 311 and then heating the top surface 311. The top surface 321 is heated using a high-frequency heating coil suitable for heating.

[0004]

That is, the central portion 331,
Since quenching of the top surface 311 and the top surface 321 was sequentially performed, it took a long time to quench one core metal 300. The present invention has been devised in view of such circumstances, and for example, a substantially semicylindrical shaft portion and both ends of the shaft portion are integrally formed with the shaft portion in a direction perpendicular to the axial direction of the shaft portion. A work provided with a pair of parallel convex veins formed and a pair of flat plate-like flat portions formed integrally with the convex veins and projecting in the axial direction outside the convex veins. Of the oscillating heating coil capable of simultaneously heating and quenching the upper surface of the shaft portion and the top surface of the convex vein portion, or simultaneously heating and quenching the upper surface of the flat plate portion in addition to the upper surface and the top surface. An object of the present invention is to provide an oscillating quenching method using this oscillating heating coil.

[0005]

A high-frequency heating coil for oscillating hardening according to claim 1 has a substantially semicylindrical shaft portion having a substantially uniform cross-sectional shape, and a shaft of the shaft portion at both ends of the shaft portion. Direction and a substantially flat top surface and a shaft portion of the first and second convex vein portions of the work, each of which has substantially convex vein first and second convex vein portions formed integrally with the shaft portion in a direction substantially perpendicular to the direction. High-frequency heating coil for oscillating quenching that simultaneously heats the upper surface of the shaft, which is a semi-open saddle type shaft heating coil formed to correspond to the shape of the upper surface of the shaft, and first and second convex veins. A first and a second top surface heating coil wound in a substantially rectangular shape so as to respectively correspond to the shape of the top surface of the portion, and the three heating coils are connected in series, and the shaft portion The heating coil is composed of three substantially parallel semicircular arc-shaped circumferential members formed along the circumferential direction of the shaft so as to straddle the shaft. A conductor and a pair of linear axial heating conductors that connect one end and the other end of each of the circumferential heating conductors are provided, and a high-frequency voltage is supplied to the contact point of the central circumferential heating conductor. It

A high frequency induction heating coil for oscillating quenching according to claim 2 has a substantially semicylindrical shaft portion having a substantially uniform cross-section.
At both ends of the shaft portion, substantially convex vein-shaped first and second convex vein portions formed integrally with the shaft portion in a direction substantially perpendicular to the axial direction of the shaft portion, and convex veins outside the convex vein portions. Substantially flat top surfaces of the first and second convex vein portions of the workpiece, which are provided with first and second flat plate portions that are formed substantially in the axial direction so as to project integrally with the plate portion, the first and second flat plates. An induction heating high-frequency heating coil for simultaneously heating the upper surface of the shaft portion and the upper surface of the shaft portion, the half-open saddle type shaft heating coil being formed to correspond to the shape of the upper surface of the shaft portion, Corresponds to the first and second top surface heating coils wound in a substantially rectangular shape so as to correspond to the top surface shapes of the first and second convex portions, and the top surface shapes of the first and second flat plate portions. And a first upper surface heating coil wound in a substantially rectangular shape so that the five heating coils are connected in series, The partial heating coil includes three substantially parallel semicircular arc-shaped heating conductors formed along the circumferential direction of the shaft portion so as to straddle the shaft portion, and one end and the other end of these circumferential heating conductors. And a pair of linear axial heating conductors that connect the respective ones with each other, and a high-frequency voltage is supplied to the connection point of the central circumferential heating conductors.

In the oscillating quenching method according to the third aspect of the present invention, a substantially semi-cylindrical shaft portion having a substantially uniform cross-sectional shape and shaft portions at both ends of the shaft portion are formed in a direction substantially perpendicular to the axial direction of the shaft portion. Oscillation firing for simultaneously heating the substantially flat top surfaces of the first and second convex vein portions and the upper surface of the shaft portion of the workpiece including the first and second convex vein portions having substantially convex vein shapes integrally formed respectively. The insertion method is a substantially open saddle type shaft heating coil formed so as to straddle the upper surface of the shaft, and a substantially rectangular shape corresponding to the shapes of the top surfaces of the first and second convex portions, respectively. A first heating coil and a second heating coil that are wound around the shaft, and the three heating coils are connected in series, and a shaft heating coil of a high-frequency heating coil for oscillating quenching,
The first and second upper surface heating coils are respectively attached to the shaft portion, the first and second
After arranging so as to face the top surface of the convex portion, the high frequency heating coil for oscillating hardening or the work is heated by oscillating the high frequency heating coil for oscillating hardening while swinging the work in the axial direction. .

According to a fourth aspect of the present invention, the oscillating quenching method has a substantially semi-cylindrical shaft portion having a substantially uniform cross-sectional shape, and a shaft portion at both ends of the shaft portion in a direction substantially perpendicular to the axial direction of the shaft portion. Substantially convex vein-shaped first and second convex vein portions formed integrally with each other, and substantially flat plate-shaped first and second externally formed convex rib portions projecting in the axial direction integrally with the convex vein portions. A swing quenching method of simultaneously heating the top surfaces of the first and second convex portions, the upper surfaces of the first and second flat plate portions, and the upper surface of the shaft portion of a workpiece including two flat plate portions,
A semi-open saddle type shaft heating coil formed so as to straddle the upper surface of the shaft portion, and a first coil wound in a substantially rectangular shape corresponding to the top surfaces of the first and second convex portions, respectively. The first and second top surface heating coils and the first and second top surface heating coils wound in a substantially rectangular shape corresponding to the shapes of the upper surfaces of the first and second flat plate portions are provided. The heating coil includes a shaft heating coil, a first heating coil, a second top heating coil, a first heating coil, and a second heating coil, which are connected in series. 2 top surface of convex vein, first,
After arranging so as to face the upper surface of the second flat plate portion, the high frequency heating coil for oscillating hardening or the work is heated by oscillating the high frequency heating coil for oscillating hardening while swinging the work in the axial direction. .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the swing heating coil of the present invention will be described below with reference to the drawings. 1 to 4 are drawings for explaining a first embodiment, FIG. 1 is a perspective view, FIG. 2 is a schematic explanatory view, FIG. 3 is a perspective view of a core metal as a work, and FIG. 4 is a work. It is a longitudinal cross-sectional view of the main part of the cored bar. FIG. 5 is a perspective view of the second embodiment. The cored bar is the same as that described in the conventional art, and therefore its description is omitted.

The oscillating heating coil 100 of the present embodiment has a shaft portion 33
Half-open saddle type shaft heating coil 50 formed so as to correspond to the shape of the upper surface of 0, and the top surface wound in a substantially rectangular shape so as to correspond to the shape of the top surface 311 of the convex vein portion 310. The heating coil 10 (first top surface heating coil) and the top surface 321 of the convex vein portion 320
A top surface heating coil 20 (second top surface heating coil), which is formed in a substantially rectangular shape corresponding to the above shape and is arranged so as to face the top surface heating coil 10.
The top heating coils 10 and 20 and the shaft heating coil 50 are connected in series.

The shaft heating coil 50 is composed of three substantially parallel semicircular arc heating conductors 51 formed along the circumferential direction of the upper surface of the shaft 330 so as to straddle the shaft 330, and these circumferential heating conductors 51. The directional heating conductor 51 is provided with a pair of linear axial heating conductors 52 that connect one end and the other end to each other. Then, in the open ends 51a, 51b of the central circumferential heating conductor 51,
High frequency voltage is supplied. The widths t1, t2, and t3 of the top surface heating coils 10 and 20 and the shaft heating coil 30 in the axial direction of the shaft portion 330 of the core metal 300 are the center of the top surfaces 311 and 321 and the top surface of the shaft portion 330, respectively. It is made smaller than the widths T1, T2, T3 of the portion 331.

Reference numerals 91 and 92 denote power supply conductors. One end of the power supply conductor 91 is connected to one end of the high frequency power source 300, and the other end is connected to the open end 51a of the circumferential heating conductor 51 at the center of the shaft heating coil 50. It is connected. One end of the inter-coil connecting conductor 94 bent at approximately 90 ° is connected to the open end 51b, and the other end is connected to one open end 10a of the top surface heating coil 10.
One end of a linear inter-coil connecting conductor 93 is connected to the other open end 10b of the top heating coil 10, and the other end is connected to one open end 20a of the top heating coil 20. To the other open end 20b of the top surface heating coil 20, one end of a power supply conductor 92 bent at approximately 90 ° is connected, and the other end is connected to the other end of the high frequency power supply 300.

Shaft heating coil 50, top heating coils 10, 2
0, power supply conductors 91, 92 and inter-coil connection conductors 93, 94
Are hollow conductors made of good conductive metal, and are hollow portions of the conductors (the hollow portions 91 of the power supply conductors 91 and 92 in FIG. 1).
a and 92a), the cooling liquid for the orbiting heating coil 100 is circulated. A partition plate 94a for the cooling liquid is provided in the hollow portion of the inter-coil connecting conductor 94.

Next, using the swing heating coil 100, the core metal 30
The central portion 331 of the upper surface of the shaft portion 330 of 0 and the convex portions 310, 3
A method for quenching the top surfaces 311 and 321 of the 20 will be described. Shaft heating coil 50 of rocking heating coil 100
At the central portion 331 of the top surface of the shank 330 of the
Are arranged so as to face the top surface 311 of the convex vein portion 310 and the top surface heating coil 20 face the top surface 321 of the convex vein portion 320 with a predetermined gap therebetween.

Next, the cooling liquid indicated by arrows B and C is supplied to the hollow portions 91a and 92a of the power supply conductors 91 and 92, respectively. The cooling liquid indicated by arrow B passes through the power supply conductor 91, the shaft heating coil 50 and the inter-coil connecting conductor 94 while cooling, reaches the partition plate 94a, and is discharged from a discharge hole (not shown). Further, the cooling liquid indicated by the arrow C is the power supply conductor 92, the top surface heating coil 20, the inter-coil connection conductor 93,
While passing through the top surface heating coil 10 and the inter-coil connecting conductor 94 while cooling, they reach the partition plate 94a and are discharged from a discharge hole (not shown) different from the discharge hole.

Further, a high-frequency current flows from the high-frequency power source 300 in the direction of arrow A, and the power supply conductor 91, the shaft heating coil
While passing through 50, the inter-coil connecting conductor 94, the top heating coil 10, the inter-coil connecting conductor 93, the top heating coil 20 and the power supply conductor 92, they are cooled and returned to the high frequency power supply 300.

In this way, the high-frequency current is passed through the rocking heating coil 100, and the rocking quenching high-frequency heating coil 100 or the core metal 300 is inserted into the core metal while the cooling liquid is still flowing.
After the shaft portion 330 and the top surfaces 311 and 321 are heated by rocking the shaft portion 330 of the 300 in the axial direction, that is, in the direction of the arrow P for a predetermined time,
The quenching is completed by injecting a cooling liquid onto these hardened surfaces. Then, as shown in FIG. 4, the desired hardened layers 332, 312 and
322 are formed on the central portion 331 of the upper surface of the shaft portion 330, the top surface 311 of the convex vein portion 310 and the top surface 321 of the convex vein portion 320, respectively.

Next, a second embodiment will be described. The same components as those described in the first embodiment are designated by the same reference numerals. The oscillating heating coil 200 of the second embodiment is provided outside the top heating coils 10 and 20 of the oscillating heating coil 100.
The upper surfaces 341 and 351 of the flat plate portions 340 and 350 of the core metal 300, respectively.
The upper surface heating coil 30 (first upper surface heating coil) and 40 (second upper surface heating coil) for heating a part of the
Only the points extending in series with 10 and 20 are oscillating heating coils
Different from 100.

That is, as shown in FIG.
30 is connected to the tips of a pair of inter-coil connecting conductors 95, 96 connected to open ends 51c, 51d provided at positions substantially opposite to the open ends 51a, 51b of the top surface heating coil 10, and , The top heating coil 40 is the open end 20 of the top heating coil 20.
Open ends 20c and 20d provided at positions almost opposite to a and 20b
Is connected to the tips of a pair of inter-coil connecting conductors 97, 98 connected to the. The shaft heating coil 30, the top heating coils 10 and 20, and the top heating coils 30 and 40 are connected in series.

This oscillating heating coil 200 uses the oscillating heating coil 100 to form a central portion 331 of the upper surface of the shaft portion 330 of the core metal 300.
, The tops 311 and 321 of the convex portions 310 and 320, respectively.
In the same way as heating the core part 300, the central part 331 of the upper surface of the shaft part 330 of the core metal 300, and the top surface of each of the convex vein parts 310, 320.
It is possible to heat the upper surfaces 341 and 351 of a part of each of the plates 311 and 321 and the flat plate portions 340 and 350.

[0021]

As described above, claims 1 and 3
In the invention, the shaft heating coil of the swing heating coil,
After arranging the first and second top surface heating coils so as to face the top surface of the shaft portion of the work and the top surfaces of the first and second convex portions, respectively, the swing heating coil or the work is mounted on the shaft portion of the work. While swinging in the axial direction, the swing heating coil can be energized for a predetermined time to simultaneously heat and quench these hardened surfaces.

Further, in the invention described in claims 2 and 4, the shaft heating coil of the swing heating coil, the first and second top surface heating coils, and the first and second upper surface heating coils are respectively provided on the workpiece. After arranging them so as to face the upper surface of the shaft portion, the top surfaces of the first and second convex portions, and the upper surfaces of the first and second flat plate portions, the rocking heating coil or the work is set in the axial direction of the work shaft portion. While rocking, the rocking heating coil can be energized for a predetermined time to simultaneously heat these surfaces to be hardened for hardening.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a schematic explanatory view of the first embodiment of the present invention.

FIG. 3 is a perspective view of a cored bar that is a work.

FIG. 4 is a vertical cross-sectional view of a main part of a cored bar that is a work.

FIG. 5 is a perspective view of a second embodiment of the present invention.

[Explanation of symbols]

10, 20 Top heating coil 30, 40 Top heating coil 50 Shaft heating coil 51 Circumferential heating conductor 52 Axial heating conductor 51a, 51b Cutting point 100, 200 swing heating coil 310, 320 Convex vein 311 and 321 top 330 Shaft 340, 350 Flat plate part 341, 351 upper surface

Claims (4)

[Claims] 1. A substantially semi-cylindrical shaft portion having a substantially uniform cross-sectional shape, and substantially convex veins formed at both ends of the shaft portion integrally with the shaft portion in a direction substantially perpendicular to the axial direction of the shaft portion. First,
A high frequency heating coil for oscillating quenching for simultaneously heating the substantially flat top surfaces of the first and second convex vein portions and the upper surface of the shaft portion of the workpiece having the second convex vein portion, the upper surface of the shaft portion. A half-open saddle type shaft heating coil formed to correspond to the shape of
First and second top surface heating coils wound in a substantially rectangular shape corresponding to the top surface shapes of the first and second convex portions, respectively, and the three heating coils are connected in series. At the same time, the shaft heating coil includes three substantially parallel semicircular arc-shaped circumferential heating conductors formed along the circumferential direction of the axial portion so as to straddle the axial portion, and these circumferential heating conductors. An oscillating burner comprising a pair of linear axial heating conductors connecting one end to the other end and the other end to each other, and a high frequency voltage is supplied to the connection point of the central circumferential heating conductors. Input high frequency heating coil. 2. A substantially semi-cylindrical shaft portion having a substantially uniform cross-sectional shape, and substantially convex veins formed at both ends of the shaft portion integrally with the shaft portion in a direction substantially perpendicular to the axial direction of the shaft portion. First,
First and second workpieces provided with second convex portions and substantially flat plate-shaped first and second flat plate portions integrally formed with the convex portions on the outside of the convex portions. (2) An oscillating quenching high-frequency heating coil for simultaneously heating the substantially flat top surface of the convex vein portion, the upper surfaces of the first and second flat plate portions, and the upper surface of the shaft portion, which corresponds to the shape of the upper surface of the shaft portion A semi-open saddle type shaft heating coil formed as described above, and a first coil wound in a substantially rectangular shape so as to correspond to the shapes of the top surfaces of the first and second convex portions, respectively.
The second top heating coil and the first and second windings wound in a substantially rectangular shape corresponding to the shapes of the upper surfaces of the first and second flat plate portions.
An upper surface heating coil, the five heating coils are connected in series, and the shaft heating coil is a substantially parallel semicircle formed along the circumferential direction of the shaft so as to straddle the shaft. It is provided with three arc-shaped circumferential heating conductors and a pair of linear axial heating conductors connecting one end and the other end of these circumferential heating conductors, respectively, and connecting the central circumferential heating conductors. A high-frequency heating coil for oscillatory hardening, characterized in that a high-frequency voltage is supplied to the break point. 3. A substantially semi-cylindrical shaft portion having a substantially uniform cross-sectional shape, and substantially convex veins formed at both ends of the shaft portion integrally with the shaft portion in a direction substantially perpendicular to the axial direction of the shaft portion. First,
A swing-quenching method of simultaneously heating the substantially flat top surfaces of the first and second convex vein portions and the upper surface of the shaft portion of the workpiece including the second convex vein portion, so as to straddle the upper surface of the shaft portion. Half-open saddle type shaft heating coil formed on the first and second top surface heating coils that are wound in a substantially rectangular shape so as to correspond to the top surface shapes of the first and second convex portions, respectively. And the three heating coils are connected in series, the shaft heating coil of the high-frequency heating coil for oscillating hardening, the first heating coil and the second upper heating coil, respectively. After arranging so as to face the top surface of the convex portion, the high frequency heating coil for oscillating hardening or the work is heated by oscillating the high frequency heating coil for oscillating hardening while swinging the work in the axial direction. An oscillating quenching method using an induction heating high frequency heating coil. 4. A substantially semicylindrical shaft portion having a substantially uniform cross-sectional shape, and substantially convex veins formed at both ends of the shaft portion integrally with the shaft portion in a direction substantially perpendicular to the axial direction of the shaft portion. First,
First and second workpieces provided with second convex portions and substantially flat plate-shaped first and second flat plate portions integrally formed with the convex portions on the outside of the convex portions. (2) A rocking quenching method of simultaneously heating the top surface of the convex vein portion, the top surfaces of the first and second flat plate portions, and the top surface of the shaft portion, which is a semi-open saddle type formed so as to straddle the top surface of the shaft portion. Shaft heating coil, first and second top surface heating coils wound in a substantially rectangular shape corresponding to the top surface shapes of the first and second convex portions, respectively, first and second
High-frequency for oscillating hardening, comprising first and second upper surface heating coils wound in a substantially rectangular shape corresponding to the shape of the upper surface of the flat plate portion, and the five heating coils are connected in series. The shaft heating coil, the first and second top heating coils, and the first and second top heating coils of the heating coil are respectively shank, first, and
After arranging so as to face the top surface of the second convex vein portion and the upper surface of the first and second flat plate portions, the oscillating quenching is performed while oscillating and quenching the high-frequency heating coil for oscillating quenching or the workpiece Quenching method using a high-frequency heating coil for oscillatory quenching, characterized in that a work is heated by energizing a high-frequency induction heating coil.