JP2003119519A - Device and method of high-frequency heating for stepped shaft-shaped workpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable several outer circumferential face parts of a stepped shaft- shaped workpiece, to be sequentially heat treated without changing a heating coil. SOLUTION: The device comprises a heating coil 10 which possesses circular arc parts 11-14 having a slightly larger inner diameter than the corresponding outer diameters to the respective outer circumferential face parts a-d, which have the different outer diameters of the stepped shaft-shaped workpiece W, and a rotating and moving mechanism 20 for rotating the stepped shaft-shaped work W and moving it relatively to the heating coil 10, in order to sequentially heat treat each of the outer circumferential face parts a-d of the stepped shaft- shaped workpiece W, by the heating coil 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating apparatus for a stepped shaft-shaped work and a high-frequency heating method for a stepped shaft-shaped work for heat-treating the outer peripheral surface of the stepped shaft-shaped work.

Conventionally, in heat-treating the outer peripheral surface of a stepped shaft-shaped work W as shown in FIG. 4, circular coils 51 to 54 having different diameters are generally used. That is,
First, the outer peripheral surface portion a of the stepped shaft-shaped work W is heat-treated using the circular coil 51. Then, after replacing the circular coil 51 with the circular coil 52, the circular coil 52 and the outer peripheral surface portion b of the stepped shaft-shaped work W are aligned, and the stepped shaft-shaped work is used using the circular coil 52. The outer peripheral surface portion b of W is heat-treated. The same applies hereafter, and the circular coil 53,
54, the outer peripheral surface portions c and d of the stepped shaft-shaped work W are sequentially heat-treated.

[0003]

However, in the case of the above-mentioned conventional example, the work of exchanging the circular coils 51 to 54 is very troublesome, which is a problem in improving the efficiency of the heat treatment process. There is. However, if the outer peripheral surface portions a to d of the stepped shaft-shaped work W are simultaneously heat-treated by the circular coils 51 to 54, such a problem can be avoided, but the shape of the stepped shaft-shaped work W In addition to the need for a wide variety of coils, there is another problem that the device itself becomes large and the cost becomes high.

The present invention was created under the above-mentioned background, and it is an object of the present invention to successively heat-treat the outer peripheral surface portion of a stepped shaft-like work without replacing the heating coil. Another object of the present invention is to provide a high-frequency heating device for a stepped shaft-shaped workpiece and a high-frequency heating method for a stepped shaft-shaped workpiece.

[0005]

The high-frequency heating apparatus for a stepped shaft-shaped work of the present invention has an inner diameter slightly larger than the outer shape corresponding to each outer peripheral surface portion having a different outer diameter of the stepped shaft-shaped work. In order to sequentially heat-treat the heating coil in which each arc portion is formed and each outer peripheral surface portion of the stepped shaft-shaped work using the heating coil, the stepped shaft-shaped work is moved relative to the heating coil. A rotary movement mechanism for rotating the stepped shaft-like work relative to the heating coil is provided. For the rotational movement mechanism,
For example, two or more rotating rollers that pivotally support the outer peripheral surface of a stepped shaft-shaped work arranged laterally, and the rotating rollers that independently rotate the rotating rollers and move the rotating rollers independently. It is preferable to use a structure having a moving mechanism section.

In such a structure, the stepped shaft-like work moves relative to the heating coil, and the outer peripheral surface of the stepped shaft-like work and the corresponding arc portion of the heating coil are aligned. Let Then, when a high-frequency current is passed through the heating coil in a state where the stepped shaft-shaped work is rotated relative to the heating coil, the outer peripheral surface portion of the stepped shaft-shaped work is heat-treated. Thereafter, by repeating this, each outer peripheral surface portion of the stepped shaft-like work is sequentially heat-treated.

More preferably, an input portion for inputting the type of the stepped axial work to be heat-treated, shape data of the stepped axial work, and an arc indicating an arc portion corresponding to each outer peripheral surface portion of the work. Part data is prepared in advance for each type of work, and a control unit for controlling the rotary movement mechanism based on the shape data and the arc part data corresponding to the type of work input through the input unit is provided. Is desirable.

With such a structure, when the type of the stepped shaft-like work to be heat-treated is input, the rotary movement mechanism is controlled based on the shape data and the arc portion data corresponding to the type of the work, and As a result, it becomes possible to heat-treat each outer peripheral surface portion of a plurality of types of stepped shaft-shaped workpieces with a heating coil.

According to the high frequency heating method for a stepped shaft-shaped work of the present invention, when heat-treating each outer peripheral surface part of the stepped shaft-shaped work, the stepped shaft-shaped work is processed by corresponding to each outer peripheral surface part having a different outer diameter. Using the heating coil in which each of the arcuate parts having an inner diameter slightly larger than the outer shape is formed, the stepped shaft-like work is moved relative to the heating coil, and the outer peripheral surface part of the stepped shaft-like work and this Aligning the arc portion of the heating coil corresponding to the above, and rotating the stepped shaft-like work relative to the heating coil, heat-treating the outer peripheral surface portion of the stepped shaft-like work by the heating coil. By repeating this, each outer peripheral surface portion of the stepped shaft-shaped workpiece is sequentially heat-treated.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a high-frequency heating apparatus for stepped shaft-shaped workpieces, FIG. 2 is a schematic view of a heating coil of the apparatus, and FIG. 3 is a cross-sectional view of another type of stepped shaft-shaped workpiece that can be heat-treated by the apparatus. Is.

The high-frequency heating apparatus for stepped shaft-shaped workpieces shown here is an apparatus for heat-treating the outer peripheral surface of the stepped shaft-shaped workpieces W, W1, etc. as shown in FIGS. An arc portion 11 having an inner diameter slightly larger than the outer shape corresponding to the outer peripheral surface portions a to d having different outer diameters of the workpiece W.
In order to sequentially heat-treat the heating coil 10 in which each of them is formed and each outer peripheral surface portion of the stepped shaft-shaped work W or the like by using the heating coil 10, the stepped shaft-shaped work W or the like is moved, Depending on the rotation moving mechanism 20 for rotating the attached shaft-shaped work W, the input unit 30 for inputting the type of the stepped shaft-shaped work W to be heat-treated, and the type of the work input through the input unit 30. And a control unit 40 that controls the rotary movement mechanism 20. Hereinafter, the configuration of each unit will be described in detail.

The heating coil 10 is a copper type pipe as shown in FIG.
It is formed by bending into a shape as shown in FIG. 1 and is arranged in the vicinity of the rotation moving mechanism 20. Heating coil 10
A high frequency power source and a cooling water pipe, which are not shown, are connected to. That is, the high frequency current output from the high frequency power source flows through the heating coil 10, and the cooling liquid supplied through the cooling water pipe flows inside thereof. In the vicinity of the heating coil 10, a cooling jacket (not shown) for cooling the stepped shaft-shaped work W after the heat treatment is arranged.

The rotary movement mechanism 20 is a rotary roller 2 that axially supports the outer peripheral surface of a stepped shaft-shaped workpiece W or the like arranged laterally.
1, 22 and a roller rotation moving mechanism 23 for independently rotating the rotating rollers 21, 22 while independently moving the rotating rollers 21, 22 respectively.

In particular, although not shown, the roller rotation moving mechanism 23 includes a rotation mechanism for independently rotating the rotation rollers 21 and 22, and rotation rollers 21 and 22.
Internal structure having a linear moving mechanism for independently moving the vertical rollers in the vertical direction, a linear moving mechanism for adjusting the interval between the rotating rollers 21, 22, and an X, Y table on which these respective mechanisms are mounted. Has become.

The control unit 40 is a microcomputer for controlling the entire apparatus. The input unit 30 such as an operation panel is connected to the input port of the microcomputer, while the output port has the inside of the roller rotation moving mechanism unit 23. The roller rotation moving mechanism 23 is connected via a circuit (not shown) that generates various signals required to operate the motors.

In the memory of the microcomputer, the shape data of the work and the arc part data indicating the arc parts 11 to 14 corresponding to the respective outer peripheral surface parts of the work are recorded in advance as a data table for each kind of work.

Specific contents of the shape data and the arc portion data when the work is the stepped shaft-like work W are as follows. The shape data is information indicating the total length of the stepped shaft-shaped work W, the lengths of the outer peripheral surface portions a to d, the outer diameter thereof, and the like. For arc part data, outer peripheral surface parts a to d
Is information to be heat-treated in this order by the arc portions 11 to 14 of the heating coil 10.

The control section 40 controls the roller rotation moving mechanism section 23 based on the shape data and the arc section data corresponding to the type of the work input through the input section 30, in addition to the function of turning on / off the high frequency power. It has a function to do.

The operation of the high-frequency heating apparatus for a stepped shaft-shaped workpiece constructed as described above will be described below, and the contents of the sequence program processed by the microcomputer of the control unit 40 will be described.

When the type of the work to be heat-treated is input to the control unit 40 through the input unit 40, the shape data corresponding to the work is read from the memory, and the height position of the heating coil 10 is read based on the shape data. In the above, the height and interval of each roller for enabling the work to be horizontally placed on the rotary rollers 21 and 22 are calculated, and this is converted into a signal to be used as a roller position command signal, which is the roller rotation moving mechanism section 23.
Output to.

When such a roller position command signal is input to the roller rotation moving mechanism unit 23, the heights and intervals of the rotation rollers 21 and 22 are set to the roller rotation moving mechanism unit 23 according to the type of work to be heat treated. Automatically adjusted by. Type of work to be heat-treated is a stepped shaft work W
Then, the heights of the rotating rollers 21 and 22 and the intervals between them are as shown in FIG.

After that, the stepped shaft-shaped work W is placed on the rotating rollers 21 and 22 by a worker or a work transfer mechanism (not shown). The positional relationship between the stepped shaft-shaped workpiece W and the heating coil 10 at this time is as shown in FIG.
The outer peripheral surface portion a of the stepped shaft-shaped work W is located at the outer peripheral surface portion a at substantially the center of the heating coil 10 as shown in FIG.
Is facing.

Information indicating that the stepped shaft-shaped work W is placed on the rotating rollers 21 and 22 is sent to the control unit 40 through a signal output by the worker from the input unit 30 or the like or a work transfer mechanism (not shown). When input, the control unit 40 performs the following processing.

First, the stepped shaft-shaped work W is removed from the memory.
Is read out, a signal for simultaneously moving the rollers 21, 22 is generated based on this arced portion data, and is output to the roller rotation movement mechanism portion 23.

Then, as the rollers 21 and 22 move horizontally, the stepped shaft-shaped work W moves in the direction A in FIG. 2, and the outer peripheral surface portion a of the stepped shaft-shaped work W and the heating coil 10 are moved. The circular arc portion 11 is aligned. The distance by which the rollers 21 and 22 are moved at the same time is preset by the controller 40.

Further, in the control section 40, the stepped shaft-shaped work W is taken into consideration because of the difference in height between the rotating rollers 21 and 22.
The respective velocities of the rotating rollers 21 and 22 for smoothly rotating the roller are calculated, converted into signals, and output to the roller rotation moving mechanism section 23 as speed command signals. At the same time, a signal for turning on the high frequency power source for a predetermined period is generated and output to the high frequency power source, and when a predetermined period has elapsed, a cooling jacket (not shown) is operated for a predetermined period.

Then, the stepped shaft-shaped work W rotates and the high-frequency current is supplied to the heating coil 10 for a predetermined period, and as a result, the outer peripheral surface portion a of the stepped shaft-shaped work W is caused by the arc portion 11 of the heating coil 10. Induction heated. After the heating is completed, the outer peripheral surface part a of the stepped shaft-shaped work W is cooled by the cooling water jetted from the cooling jacket, and the heat treatment is completed on the outer peripheral surface part a of the stepped shaft-shaped work W.

In the control unit 40, the stepped shaft-shaped work W
After the heat treatment of the outer peripheral surface portion a is completed, a signal for simultaneously moving the rollers 21 and 22 is generated based on the arc portion data and is output to the roller rotation moving mechanism section 23.

Then, as the rollers 21 and 22 move in the opposite direction to the above, the stepped shaft-shaped work W moves in the direction B in FIG. And the arc portion 12 of the heating coil 10 face each other.

Thereafter, the control section 40 generates a signal for simultaneously moving the rollers 21 and 22 based on the shape data and outputs the signal to the roller rotation moving mechanism section 23.

Then, as the rollers 21 and 22 move in the direction E in the drawing, the outer peripheral surface portion b of the stepped shaft-shaped work W is formed.
And the arc portion 12 of the heating coil 10 are aligned.

Then, the control unit 40 generates a signal for turning on the high frequency power source for a predetermined period and outputs the signal to the high frequency power source, and when a predetermined period has elapsed, a cooling jacket (not shown) is operated for a predetermined period.

Then, a high-frequency current is supplied to the heating coil 10 for a predetermined period of time, and as a result, the outer peripheral surface portion b of the stepped shaft-shaped work W is induction-heated by the arc portion 12 of the heating coil 10. After the heating is completed, the outer peripheral surface portion b of the stepped shaft-shaped work W is cooled by the cooling water ejected from the cooling jacket, and the heat treatment is completed on the outer peripheral surface portion b of the stepped shaft-shaped work W.

The subsequent processing of the control section 40 is exactly the same as the above, and as a result, the outer peripheral surface portion a of the stepped shaft-shaped work W is obtained.
~ D are sequentially heat-treated by the arcuate portions 11 to 14 of the heating coil 10. Further, when the type of work to be heat-treated is switched to the stepped shaft-shaped work W1 shown in FIG. 3, only by inputting the type of the work through the input unit 30, the outer circumference of the stepped shaft-shaped work W1 is exactly the same as above. The surface portions e and f are sequentially heat-treated by the arc portions 11 and 13 of the heating coil 10.

As described above, in the case of the high-frequency heating apparatus for the stepped shaft-shaped work, unlike the case of the conventional example, the outer peripheral surface portions a to d of the stepped shaft-shaped work W are replaced without replacing the heating coil 10. And the like can be sequentially heat-treated. Moreover, since the type of work to be heat-treated can be changed extremely smoothly, it is possible to improve the efficiency of the heat-treatment process and to realize cost reduction in this respect.

The present invention is not limited to the above embodiment, and the heating coil may have any shape,
The stepped shaft-like work may be fixed and the heating coil may be moved.

[0037]

As described above, in the case of the high-frequency heating apparatus for a stepped shaft-shaped work and the method for high-frequency heating of a stepped shaft-shaped work according to the present invention, the outer peripheral surface portion of the stepped shaft-shaped work can be replaced without replacing the heating coil. Since it is possible to sequentially perform the heat treatment, it is possible to improve the efficiency of the heat treatment process, and it is possible to realize cost reduction in this respect.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of the present invention, and is a schematic configuration diagram of a high-frequency heating device for a stepped shaft-shaped work.

FIG. 2 is a schematic view of a heating coil of the same device.

FIG. 3 is a cross-sectional view of another type of stepped shaft-like work that can be heat-treated by the apparatus.

FIG. 4 is a schematic diagram for explaining a conventional example.

[Explanation of symbols]

10 heating coil 11-14 arc part 20 Rotational movement mechanism 30 Input section 40 control unit W Stepped shaft work a to d outer peripheral surface portion

Claims (4)

[Claims] 1. A heating coil in which arc-shaped portions each having an inner diameter slightly larger than the outer shape are formed corresponding to outer peripheral surface portions having different outer diameters of the stepped shaft-shaped work, and each of the stepped shaft-shaped work. In order to sequentially heat-treat the outer peripheral surface portion using the heating coil, the stepped shaft-like work is moved relative to the heating coil, while the stepped shaft-like work is rotated relative to the heating coil. A high-frequency heating device for a stepped shaft-shaped workpiece, comprising a moving mechanism. 2. The high-frequency heating apparatus for a stepped shaft-shaped work according to claim 1, wherein the rotational movement mechanism includes two or more rotating rollers that pivotally support an outer peripheral surface of the stepped shaft-shaped work arranged laterally. A high-frequency heating for a stepped shaft-shaped work, characterized in that it has a roller rotation moving mechanism section for independently rotating each of the rotating rollers and independently moving each of the rotating rollers. apparatus. 3. The stepped shaft-shaped workpiece high-frequency heating apparatus according to claim 1, wherein an input portion for inputting a type of the stepped shaft-shaped workpiece to be heat-treated, and shape data of the stepped shaft-shaped workpiece. And arc part data indicating the arc part corresponding to each outer peripheral surface part of the work are prepared in advance for each work type, and based on the shape data and the arc part data corresponding to the work type input through the input unit. And a control unit for controlling a rotation moving mechanism. 4. When heat-treating each outer peripheral surface portion of the stepped shaft-shaped work, an arc portion having an inner diameter slightly larger than the outer shape is formed corresponding to each outer peripheral surface portion having a different outer diameter of the stepped shaft-shaped work. Using each heating coil formed, move the stepped shaft-like work relative to the heating coil to align the outer peripheral surface of the stepped shaft-like work with the corresponding arc of the heating coil. Then, while rotating the stepped shaft-like work relative to the heating coil, the outer peripheral surface portion of the stepped shaft-like work is heat-treated by the heating coil. A high-frequency heating method for a stepped shaft-shaped workpiece, characterized in that the surface portions are sequentially heat-treated.