JP2841169B2 - End or flange surface hardened coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end face or flange surface quenching coil for quenching an end face or a flange face which is a quenched face of a workpiece by high frequency induction heating.

[0002]

2. Description of the Related Art In the case of quenching an end surface or a flange surface which is a quenched surface of a work, a pancake-type quenching coil is conventionally used. As shown in FIG. 8A, the quenched coil includes a heating conductor 1 formed by winding a copper round tube many times like a pancake. At the time of quenching, the heating conductor 1 is opposed to the surface to be quenched WA of the work W, and a high-frequency current is applied to the heating conductor 1 while rotating the work W to induction-heat the entire surface to be quenched WA. . When the heating is completed, the heating conductor 1 is moved away from the surface to be quenched WA, and the coolant is sprayed on the surface to be quenched WA. A round tube is wound around the heating conductor 1 with almost no gap so as to prevent unevenness in the quenched surface WA.

[0003] Depending on the workpiece W, not only the surface to be quenched WA, but also the outer surface of the base of the shaft WB protruding from the center of the surface to be quenched WA may be quenched together with the end surface. WA
In some cases, the inner surface of the inlet portion of the shaft hole WC established in the center of the steel is hardened together with the surface to be hardened WA. In these cases, FIG.
As shown in (B) and (C), a quenching coil in which a sub-heating conductor 2 formed by winding a round tube into a coil shape and attached to the center of the heating conductor 1 is used. By making the sub-heating conductor 2 face the outer surface of the base of the shaft body WB or the inner surface of the inlet of the shaft hole WC, these peripheral surfaces are heated simultaneously with the surface to be hardened WA.

As shown in FIGS. 8D, 8E and 8F, there is a case where a surface WA to be quenched conically inclined is quenched.

[0005]

The conventional quenching using a pancake type quenching coil has the following problems due to the configuration of the quenching coil.

Since there is almost no gap between the round tubes constituting the heating conductor 1, the surface to be quenched WA is covered by the heating conductor 1 during heating, and the surface to be quenched WA cannot be sufficiently observed. Therefore, it is difficult to visually determine the heating temperature (the degree of burning).

When the distance (gap) from the heating conductor 1 to the quenched surface WA is constant, the temperature of the outer peripheral portion of the quenched surface WA becomes higher than that of the inner peripheral portion, so that the quenched surface WA becomes uniform. Not heated. Therefore, the gap is adjusted so that the gap becomes smaller from the outer peripheral portion to the inner peripheral portion of the heating conductor 1, but the adjustment is difficult. for that reason,
Uneven heating of the quenched surface WA is inevitable. This problem is particularly remarkable when the quenched surface WA is inclined in a conical shape.

Since there is no gap between the round tubes constituting the heating conductor 1, it is necessary to move the quenching coil or the work W when spraying the cooling liquid onto the heated quenching surface WA. Further, a core made of, for example, ferrite for promoting heating cannot be attached to the heating conductor 1.

When simultaneously heating the outer surface of the shaft body WB and the inner surface of the shaft hole WC, the coil-shaped sub-heating conductor 2 is used for the heating, so that these portions are earlier than the quenched surface WA. Therefore, it is difficult to balance the temperature between the quenched surface WA and other portions.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and enables the end face or the flange surface, which is the surface to be quenched, to be directly visually observed, and furthermore, the end surface or the flange which can easily and uniformly heat the quenched surface. It is an object to provide a case hardening coil.

Still another object of the present invention is to provide a method for simultaneously heating the outer surface of a shaft body and the inner surface of a shaft hole provided at the center of a surface to be quenched. An object of the present invention is to provide an end face or flange face hardening coil which can easily balance the temperature.

[0012]

An end face or flange surface quenching coil according to the present invention heats a quenched surface by high frequency induction to quench an end face or a flange surface which is a quenched surface of a work. A coil, as a heating conductor facing the surface to be quenched, such that one end thereof faces an outer peripheral portion of the surface to be quenched, and the other end faces an inner peripheral portion of the surface to be quenched. ,
It is characterized in that it has an arc portion in which the radius decreases stepwise or continuously from one end to the other end, and the degree of decrease in the radius increases as approaching the other end.

According to a second aspect of the present invention, there is provided an end face or flange face hardening coil having a step corresponding to a plurality of tracks formed on the hardened surface when the hardened surface is divided into equal lengths in the radial direction. A plurality of small arc portions each having a reduced radius, the arc portion being formed, and an angle at which each of the plurality of small arc portions is viewed from the center of the arc portion is substantially proportional to an area of a track corresponding to the small arc portion. It is.

According to a third aspect of the present invention, there is provided an end face or flange surface quenching coil for simultaneously inducing high frequency induction between a quenched surface of a work and an outer surface of a base portion of a shaft protruding from the center of the quenched surface. In order to heat, a semi-open saddle-shaped portion is provided at the center position of the arc portion, which is connected in series with the arc portion, and protrudes in the central axis direction so as to face the outer surface of the base of the shaft body. is there.

According to a fourth aspect of the present invention, there is provided an end face or flange surface quenching coil, wherein a quenched surface of a workpiece and an inner surface of an inlet portion of a shaft hole formed in the center of the quenched surface are simultaneously subjected to high frequency induction heating. Therefore, a semi-open saddle-shaped portion connected in series with the arc portion and protruding in the central axis direction so as to face the inner surface of the inlet portion of the shaft hole is provided at the center position of the arc portion. .

Furthermore, in the end face or flange face quenching coil according to the fifth aspect, since the quenched surface that is inclined in a conical shape is subjected to high frequency induction heating, the distance to the quenched surface is substantially constant in each part. Thus, the arc portion is inclined.

[0017]

In the end face or flange face hardening coil according to the present invention, the arc portion of the heating conductor partially faces the surface to be hardened. In this state, the quenched surface is heated by flowing a high-frequency current through the heating conductor while rotating the quenched surface. Here, the arc portions are opposed from the outer peripheral portion to the inner peripheral portion of the quenched surface. Further, the degree of decrease in radius increases toward the inner peripheral portion, and the difference in area between the outer peripheral portion and the inner peripheral portion of the quenched surface is absorbed. Therefore, even though the arc portion partially faces the quenched surface, the quenched surface can be uniformly heated.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an end face or flange face hardening coil showing one embodiment of the present invention, FIG. 2 is a bottom view of the coil, FIG.
Fig. 4 is a front view of the coil, Fig. 4 is a bottom view showing a state where the coil is combined with an accessory member, and Fig. 5 is a schematic plan view for explaining a method of designing a circular arc portion.

The end surface or flange surface quenched coil shown here has a shaft hole WC formed in the center of the surface WA to be quenched and the surface WA to be quenched has a conical slope. It is used to simultaneously heat the portion from the quenching surface WA to the inner surface of the inlet of the shaft hole WC.

As shown in FIGS. 1 to 3, the end surface or flange surface quenched coil according to the present embodiment serves as a heating conductor for heating the quenched surface WA of the work W, and has a half-circumference around the quenched surface WA. And arc portions 10 facing each other. Further, a semi-open saddle portion 20 protruding from the center of the arc portion 10 is provided as a sub-heating conductor for heating the inner surface of the inlet portion of the shaft hole WC.

Further, a pair of L-shaped lead portions 30, 30 extending from the center of the arc portion 10 to the opposite side of the semi-open saddle portion 20 are provided as power supply conductors for supplying power to these. These are formed of a copper square tube together with a straight portion 40 described later to form an end face or flange face hardened coil.

The circular arc portion 10 has a plurality of small circular arc portions 11 to 15 having a constant radius whose distance (radius) from the center gradually decreases.
It is a shape that connects. The small arc portion 11 having the largest radius faces the outermost peripheral portion of the quenched surface WA, and the small arc portion 15 having the smallest radius faces the innermost peripheral portion of the quenched surface WA. The angles of the small circular arc portions 11 to 15 as viewed from the center gradually decrease from those having a large radius to those having a small radius. That is, the degree of decrease in the radius of the small circular arc portions 11 to 15 increases from the large radius side to the small radius side. The specific design method of the small arc portions 11 to 15 will be described later in detail.

The semi-open saddle type portion 20 includes a semi-circular portion 21 concentric with the center of the arc portion 10, a pair of linear portions 22 extending from both ends of the semi-circular portion 21 in the central axis direction, 22. These are arc-shaped portions 1 on the surface WA to be hardened of the workpiece W.
When it faces 0, it is inserted into the shaft hole WC and faces the inner surface of the entrance.

The end of the arc portion 10 on the large radius side is the arc portion 1
It is connected to one end of one L-shaped lead 30 via a straight portion 40 extending in the radial direction of zero. The end of the arc portion 10 on the small radius side is the one straight portion 2 of the semi-open saddle portion 20.
2 are connected to one end. The end of the other straight portion 22 of the semi-open saddle portion 20 is connected to one end of the other L-shaped lead 30. The other end of each of the L-shaped leads 30, 30 is connected to a power supply terminal plate 50,
50 and connected to water bases 60, 60.

The arc portion 10 and the straight portion 40 are formed such that the distance to the quenched surface WA is constant at each portion.
It is inclined according to the inclination of A (see FIG. 3).

As shown in FIG. 4, this end face or flange face quenching coil is combined with three cooling liquid jet jackets 80, 80, 80 having a substantially fan shape and a number of heating promoting cores 70 made of, for example, ferrite. Have been.

One of the coolant spray jackets 80 is disposed on the opposite side of the center of the arc portion 10 across the center, and the other coolant spray jacket 80 is located outside the small radius portion of the arc portion 10. Has been established. Further, the other coolant spray jacket 80 is disposed above a small radius portion of the arc portion 10. Any coolant spray jacket 80
Also, it is on the same plane as the arcuate portion 10 and faces the quenching surface WA of the work W, and has a number of coolant injection holes on the facing surface. A large number of heating promoting cores 70 are provided along both side surfaces of the arc portion 10 and the straight portion 40.

When performing quenching, as shown in FIG. 3, the arc portion 10 is opposed to the surface WA to be quenched, and the shaft hole W is formed.
The semi-open saddle portion 20 is made to face the inner surface of the inlet portion of C. In this state, a high-frequency current is applied to the end surface or flange surface hardening coil while rotating the work W around the central axis. Thereby, the portion from the surface WA to be hardened to the inner surface of the inlet of the shaft hole WC is simultaneously heated.

At this time, the arc portions 10 are opposed from the outer peripheral portion to the inner peripheral portion of the surface WA to be quenched, and the small arc portions 11 to 11 are formed.
In No. 15, since the circumferential length decreases from the large radius side to the small radius side, the quenched surface WA can be uniformly heated. The reason will be clarified in the method of designing the circular arc portion 10 described below.

As described above, since the surface to be quenched WA is uniformly heated, the distance from the arcuate portion 10 to the surface to be quenched WA may be constant at each portion, and strict adjustment control is not required. Further, the semi-open saddle portion 20 is different from the coil-shaped sub-heating conductor such as the quenching coil described in the section of the prior art, and heats the inner surface of the inlet portion of the shaft hole WC in a well-balanced manner with the surface WA to be quenched. be able to. Furthermore, even when combined with the cooling liquid jet jackets 80, 80, 80 and the core 70 for heating promotion, there is still a wide gap around the circular arc portion 10 as a heating conductor. The temperature (degree of burning) of the entrance surface WA can be visually observed.

When the heating is completed, the cooling liquid spray jacket 8 combined with the end face or the flange surface hardening coil without retracting the end face or the flange surface hardening coil.
The coolant is injected from 0, 80, 80. Since the cooling spray jackets 80, 80, 80 are provided at positions avoiding the arc portion 10, the straight portion 40 or the heating promoting core 70, the cooling liquid is directly sprayed onto the quenched surface WA of the work W. Will be. Thus, the movement of the end surface or flange surface quenching coil and the work W when spraying the cooling liquid becomes unnecessary.

Next, a method of designing the circular arc portion 10 will be described with reference to FIG.

The width of the square tube constituting the arc portion 10 is H,
The outer diameter of the quenched surface WA of the workpiece W is DA, and the inner diameter is DB. The number of square tubes that can be arranged in the radial direction of the quenched surface WA is represented by (DA-DB) / 2H. This number is the number n of stages of the arc portion 10, that is, the number of small arc portions 11 to 15. Therefore, the quenched surface WA is equally divided into n stages in the radial direction. Then, n tracks T1 to T5 are formed from the outer periphery to the inner periphery of the quenched surface WA. Small arcs 11-1
Reference numeral 5 is located on each of the tracks T1 to T5, and is responsible for heating each track.

Here, the area of the tracks T1 to T5 is defined as A1
When the angle at which the arc portion 10 is viewed from the center is θ, the small arc portions 11 to 11 are obtained by proportionally distributing the angle θ of the arc portion 10 according to the areas A1 to A5 of the tracks T1 to T5.
There are 15 angles θ1 to θ5. That is, the track T1
Reciprocals of areas A1 to A5 and small arc portions 11 to 15
Are all the same.

Now, for example, the width H of the square tube is 10 mm, the outer diameter DA of the quenched surface WA of the work W is 200 mm, and the inner diameter DB is
Is set to 100 mm, and the angle θ of the arc portion 10 is set to 180 °.
The angles θ1 to θ5 of the small arc portions 11 to 15 are calculated and viewed.

The number n of stages of the arc portion 10, that is, the small arc portion 1
The number of 1 to 15 is 5, and the area A of the tracks T1 to T5
1 to A5 are 2983 mm ² , 2669 mm ² , 23
55mm ^2, the 2041mm ^2, 1727mm ^2. These proportions in the total area (A + B + C + D + E) of the quenched surface WA are 25.33%, 22.67%, and 20.00%.
%, 17.33%, and 14.67%, the angles θ1 to θ5 of the small arc portions 11 to 15 are 46 °, 41 °, and 36, respectively.
°, 31 ° and 26 °.

As described above, the angle θ of the small arc portions 11 to 15
Tracks T in which small arc portions 11 to 15 take charge of 1 to θ5
By making the areas T1 to T5 proportional to the areas A1 to A5, the tracks T1 to T5 are uniformly heated, and as a result, the entire surface WA to be hardened is uniformly heated.

The angle θ of the arc portion 10 is not limited to 180 °, but can be appropriately selected within a range of 360 ° or less. Further, the angle may exceed 360 ° as long as it does not affect the peripheral members.

In this embodiment, the circular arc portion 10 is constituted by a plurality of small circular arc portions 11 to 15 whose radii change stepwise. However, the radius of the circular arc portion 10 can be changed continuously. In that case, as shown by a two-dot chain line in FIG.
The arc portion 10 may be formed by a curve passing through the midpoints a, b, c, and d of the connection portions of the small arc portions 11 to 15. By doing so, similarly to the case where the circular arc portion 10 is configured by a plurality of small circular arc portions 11 to 15 whose radius changes stepwise,
The entire quenched surface WA is uniformly heated.

FIG. 6 is a front view of an end face or flange surface hardening coil showing another embodiment of the present invention, and FIG. 7 is a plan view of the coil.

As shown in FIG. 6, the end surface or flange surface hardened coil according to the present embodiment has a shaft WB formed at the center of the surface WA to be hardened, and the surface WA to be hardened is conical. This is used to simultaneously heat a portion of the workpiece W inclined from the hardened surface WA to the outer surface of the base of the shaft body WB.

Such an end face or flange face quenching coil is
An arc portion 10 is provided as a heating conductor for heating the quenched surface WA of the workpiece W, and is provided with an arc portion 10 facing the quenched surface WA over a half circumference, and serves as a sub-heating conductor for heating the outer surface of the base of the shaft body WB. A semi-open saddle-shaped portion 20 protruding from the center of the device 10 is provided.

The semi-open saddle portion 20 surrounds the outer surface of the base of the shaft WB when the arc portion 10 faces the surface to be quenched WA. The other configuration is substantially the same as that of the above-described embodiment.

The two embodiments described above are directed to the work W in which the surface WA to be quenched is inclined and the shaft body WB and the shaft hole WC are formed in the surface quenched WA. Figure 8
Work W having a flat hardened surface WA as shown in FIG.
Heating the surface WA to be quenched as shown in FIG.
(C) As shown in (C), the hardened surface WA of the work W having the shaft body WB and the shaft hole WC provided at the center of the flat hardened surface WA and the peripheral surface of the shaft body WB and the shaft hole WC. Simultaneous heating, and further, heating of the quenched surface WA of the workpiece W whose quenched surface WA is inclined in a conical shape as shown in FIG.

[0045]

As described above, the end face or flange face quenched coil according to the present invention partially faces the quenched face as a heating conductor for heating the end face or the flange face which is the quenched face. Since the arc portion is used, the surface to be quenched can be visually observed at the time of heating, and it is easy to determine the heating temperature (degree of burning). Since the cooling conductor spray jacket can be combined with the heating conductor, when spraying the cooling fluid on the surface to be hardened,
There is no need to move the coil or work. The heating conductor may be provided with a heating promoting core. Also, despite the use of an arc part that partially faces the quenched surface,
Since the surface to be quenched can be uniformly heated, even when the surface to be quenched is inclined, it is easy to adjust and manage the gap from the heating conductor to the surface to be quenched.

In the end face or flange surface quenching coil according to the second aspect, the arc portion is constituted by a plurality of small arc portions whose radius changes stepwise, and the quenched surface which each small arc portion is in charge of. Since the angle of each small arc portion is set according to the upper track area, the surface to be quenched can be particularly uniformly heated.

The end face or flange surface quenched coil according to the third aspect of the present invention heats the outer surface of the base of the shaft provided at the center of the surface to be quenched. Since the open saddle portion is provided, the portion from the surface to be quenched to the outer surface of the base of the shaft can be simultaneously and well-balanced.

The end face or flange face quenching coil according to the fourth aspect of the present invention heats the inner surface of the entrance of the shaft hole provided at the center of the quenched surface, so that the coil is halfway at the center of the arc. Since the open saddle portion is provided, the portion from the surface to be quenched to the inner surface of the inlet of the shaft hole can be simultaneously heated in a well-balanced manner.

Furthermore, in the end face or flange face quenching coil according to the fifth aspect, the arc portion is inclined according to the inclination of the quenched surface of the work, so that the inclined quenched surface is uniformly heated. Can be.

[Brief description of the drawings]

FIG. 1 is a perspective view of an end face or flange face hardening coil showing one embodiment of the present invention.

FIG. 2 is a bottom view of the coil.

FIG. 3 is a front view of the coil.

FIG. 4 is a bottom view showing a state where the coil is combined with an accessory member.

FIG. 5 is a schematic plan view for explaining a method of designing an arc portion.

FIG. 6 is a front view of an end surface or flange surface hardening coil showing another embodiment of the present invention.

FIG. 7 is a plan view of the coil.

FIG. 8 is a schematic diagram showing a conventional hardening coil and a work to be hardened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Arc part 11-15 Small arc part 20 Semi-open saddle part 30 L-shaped lead part 40 Linear part 70 Heating core 80 Coolant spray jacket W Work WA Hardened surface of work

Claims (5)

(57) [Claims] 1. A coil for high-frequency induction heating of a quenched surface for quenching an end surface or a flange surface, which is a quenched surface of a work, wherein a heating conductor facing the quenched surface is One end is opposed to the outer periphery of the quenched surface, and the other end is opposed to the inner periphery of the quenched surface, so that the radius is stepwise or gradually from one end to the other end. An end face or flange surface quenching coil comprising a circular arc portion which continuously decreases and whose degree of decrease in radius increases toward the other end. 2. The arcuate portion includes a plurality of small arc portions whose radius gradually decreases corresponding to a plurality of tracks formed on the quenched surface when the quenched surface is divided into equal lengths in the radial direction. 2. An end face or flange surface according to claim 1, wherein the angle at which each of the plurality of small arc portions is viewed from the center of the arc portion is substantially proportional to the area of the track corresponding to the small arc portion. Input coil. 3. The high-frequency induction heating of the surface to be quenched of the workpiece and the outer surface of the base of the shaft projecting from the center of the surface to be quenched at the same time. 3. An end face or a flange face according to claim 1 or 2, further comprising a semi-open saddle-shaped part which is connected in series to the shaft body and protrudes in the direction of the central axis so as to face an outer surface of a base of the shaft body. Quenching coil. 4. In order to simultaneously perform high-frequency induction heating on a surface to be quenched of a workpiece and an inner surface of an inlet of a shaft hole formed in a center portion of the surface to be quenched, a center position of the circular arc portion is provided. 3. An end face or flange face according to claim 1 or 2, wherein a semi-open saddle-shaped part connected in series and protruding in the direction of the central axis so as to face an inner surface of the inlet part of the shaft hole is provided. Input coil. 5. The high-frequency induction heating of a conically inclined surface to be quenched, wherein the arc portion is inclined such that a distance to the surface to be quenched is substantially constant in each portion. The end face or flange face quenched coil according to claim 1, 2, 3, or 4.