JP2002266020A - High-frequency induction heating method and apparatus for crank shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-frequency induction heating method of a crank shaft and an apparatus therefor, by which pin parts or journal parts of the crank shafts different in diameter can be heated with the same kind of a high frequency induction hearting coil and the heating coil can be used in common. SOLUTION: A pressing force imparting means 11 (e.g. a cylinder device 12 or a spring 21) for imparting the pressing force is attached to an assembly S of the high-frequency induction heating coil 3a and a plurality of placing chips 5a-5c in the horizontal direction, and when the pin parts and the journal parts are subjected to high-frequency induction heating while the high-frequency induction heating coil are allowed to follow up the pin parts or the journal parts, the pressing force is always applied to the assembly S in the horizontal direction by the pressing force imparting means 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for high-frequency induction heating of a pin or a journal of a crankshaft when the pin or the journal is quenched or tempered.

[0002]

2. Description of the Related Art FIG. 6 shows a crankshaft 1 for a four-cylinder engine, which is an example of a crankshaft for a multi-cylinder engine.
And the four pin portions P ₁ ,
1 shows a conventional high-frequency induction heating apparatus 2 for performing high-frequency induction heating for quenching or tempering P ₂ , P ₃ , and P ₄ .

[0003] The crankshaft 1 for a four-cylinder engine is
It is an integrally molded product by forging, and the crankshaft
5 journals arranged along one axis X
J₁, J _Two, J_Three, J_Four, J_FiveAnd the jas next to each other
A total of 4
Pin part P₁, P_Two, P_Three, P_FourAnd the pins next to each other
And one each between the journal section
A total of eight counterweight parts K₁, K_Two, K_Three, K
_Four, K_Five, K₆, K₇, K₈And the journal on one end
J_FiveAnd a flange portion F provided at the tip of
You. The axis X of the crankshaft 1 (each journal)
Department J₁~ J_FiveLine connecting the centers of
Of both sides in the direction along the rotation center axis of the shaft 1).
A pair of pins P ₁, P_FourAre the same axis Y₁Have
And an intermediate point in a direction along the axis X.
A pair of pins P_Two, P_ThreeAre the same axis Y_TwoHas
ing. Note that these axes Y₁, Y_TwoIs the journal
J₁~ J_FiveOffset by an equal distance from the axis X of
And the pin P₁, P_FourAnd pin P_Two, P_ThreeIs in phase with
They are arranged 180 degrees apart.

Conventionally, when high-frequency induction heating is performed for quenching the pin portions P ₁ , P ₂ , P ₃ , and P ₄ of this type of crankshaft 1, a semi-open saddle-type high-frequency induction heating coil 3a, The high-frequency induction heating device 2 including 3b, 3c, and 3d is used. This high frequency induction heating device 2
As shown in FIGS. 6 and 7, a semi-open saddle arranged corresponding to the upper half portion of the cylindrical peripheral surface α of the pin portions P _{1 to} P ₄ of the crankshaft 1 driven to rotate about the axis X. -Type high-frequency induction heating coils 3a to 3d, a pair of side plates 4 for holding these high-frequency induction heating coils 3a to 3d in a state of being clamped from both sides, respectively, and a pair of these side plates for supporting the coils 4, ceramic mounting chips (mounting contacts) 5a, 5b, 5c fixedly arranged at predetermined positions (for example, three positions) respectively attached to the high-frequency induction heating coils 3a to 3d. High-frequency current supply disk transformers 6a to 6d are integrally connected to the upper portions of the induction heating coils 3a to 3d, respectively.

[0005] As shown in FIG.
One of the mounting chips 5b among the other mounting chips 5a and 5c is arranged along the vertical direction at a central position between the other mounting chips 5a and 5c and higher than the other mounting chips 5a and 5c. The chips 5a and 5c are arranged along the horizontal direction at locations facing each other. The above-mentioned disk transformers 6a to 6d are connected to power supply lead conductors 7, respectively, and a predetermined high-frequency power is supplied from a high-frequency power source (not shown) via the lead conductors 7 to the disk transformers 6a to 6d and the high-frequency induction. It is configured to be sequentially supplied to the heating coils 3a to 3d.

The high-frequency induction heating coils 3a to 3d,
Mounting chips 5a to 5c and disk transformers 6a to 6
The union S composed of d is swingably supported by a four-side link type follow-up mechanism 8 as shown in FIG. Further, the high-frequency induction heating device 2 and the follow-up mechanism 8 are configured to be moved up and down by a lifting device (not shown) provided at the pin heating station. Therefore,
High-frequency induction heating coil 3a~3d is freely and with swingably supported lifting against a non-illustrated high-frequency power supply (power matching Edition), the pin portion P ₁ of the crankshaft 1 is rotated about the axis X to P ₄ is swingably supported so as to follow the pin portion P ₁ to P ₄ under the placed state on.

The above-mentioned pin portion P₁~ P_Four(Outer diameter: D1)
When performing high frequency induction heating for quenching or tempering
Has conventionally performed the following operation. First, outside the figure
High-frequency induction heating device 2 and follow-up mechanism
8 to lower each pin P₁~ P_FourCylindrical peripheral surface α
Each of the three mounting chips 5a, 5b, 5c
Each high frequency induction heating coil 3
a to 3d are each pin P ₁~ P_FourFor the cylindrical peripheral surface α of
Placed on top of it with a small gap
(See FIG. 8). Next, the crankshaft 1 is
Follower X is rotated around arrow X in the direction of arrow R (see FIG. 7).
Each high frequency induction heating coil 3a to 3d is connected to each pin by the structure 8.
Part P₁~ P_FourWhile following the rotation of
From the wave power supply via the disk transformers 6a to 6d, respectively.
A high-frequency current to each of the high-frequency induction heating coils 3a to 3d.
Power is supplied for a certain period of time and each pin P₁~ P_FourThe required grill
High-frequency induction heating to the input or tempering temperature.

[0008] Then, after completion of the high-frequency induction heating, the pin portion P ₁ to P coolant from an unillustrated coolant injection jacket installed at the bottom of each high-frequency induction heating coil 3a~3d
Inject to ₄ to perform quenching or tempering. Thereafter, the rotation of the crankshaft 1 is stopped, and each of the high-frequency induction heating coils 3a to 3d is moved upward by the lifting device and held at the standby position, thereby completing one cycle of the quenching or tempering operation. .

When the journals J _{1 to} J ₅ of the crankshaft 1 are subjected to high frequency induction heating for quenching or tempering, the same operation is performed using the same apparatus as described above. I have.

[0010]

SUMMARY OF THE INVENTION
High frequency induction heating of conventional crankshafts
The method and apparatus have the following problems. Sand
In the conventional case, the pin P ₁~ P_FourOr journal J
₁~ J_FiveInduction heating for quenching or tempering
The pin P₁~ P_FourOr journal J
₁~ J_FiveBetween the high-frequency induction heating coils 3a to 3d
The interval may be, for example, all three mounting chips 5a to 5c.
The pin portion P₁~ P_FourOr journal J₁~ J_FiveCircle of
By contacting the cylindrical peripheral surface α, a predetermined interval is obtained.
It is set as follows. Therefore, quenching or tempering
Pin P to be₁~ P_FourCorresponding to the outside diameter of
High-frequency induction heating coil 3a having dimensions and shapes
~ 3d need to be prepared. Therefore, quenching or quenching
Pin P to be returned₁~ P_FourHas an outer diameter of, for example, D1
When changing from (see FIG. 8) to D2 (see FIG. 9), high frequency
Dedicated induction heating coils 3a to 3d
Exchange and change the fixing position of the mounting chips 5a to 5c.
You need to set it again.

The pin portions P _{1 to} P ₄ or the journal portions J ₁ to
The outside diameter of the J ₅ dimensions and shape of the high-frequency induction heating coil 3a~3d not correspond respect, moreover mounting the chip 5a
When the fixing position of ~5c is not adjusted, the cylindrical circumferential surface of the pin portion P ₁ to P ₄ or journal portion J ₁ through J ₅ alpha
At the time of mounting the high-frequency induction heating coils 3a to 3d thereon, as shown in FIG.
b is in contact with the cylindrical peripheral surface α, but the other two mounting chips 5a and 5c arranged in the horizontal direction and the cylindrical peripheral surface α are not in contact with each other but between them. The gaps β and γ will be generated. When such high-frequency induction heating coil 3a~3d under state is placed on the cylindrical circumferential surface alpha, during the heating operation of the pin portion P ₁ to P ₄ or journal portion J ₁ through J ₅ and During the quenching or tempering cooling operation, the pin portions P _{1 to} P ₄ or the journal portion J ₁
Through J ₅ are mounting chips 5a, so that the variation between 5b. Along with this, the interval between the cylindrical peripheral surface α and the high-frequency induction heating coils 3a to 3d changes, which causes a problem that a predetermined quenching quality cannot be obtained. Moreover, the pin portion P ₁ to P ₄ or journal portion J ₁ through J ₅ are mounting chip 5a, the impact when colliding with the 5c, possibly these mounting chips 5a, 5c is broken increases .

The present invention has been made in view of such a problem, and an object of the present invention is to provide the dimensions and dimensions of a high-frequency induction heating coil at the outer diameter of a pin or a journal of a crankshaft which is an object to be heated. Even if the shape is not compatible and the mounting chip position is not adjusted, uniform high-frequency induction heating can be performed and collision between the pin or journal and the mounting chip is avoided. The pin portion or the journal portion of the crankshaft having a different outer diameter can be subjected to high-frequency induction heating by the same type of high-frequency induction heating coil, so that the high-frequency induction heating coil can be shared. An object of the present invention is to provide a high-frequency induction heating method and apparatus for a crankshaft.

[0013]

In order to achieve the above-mentioned object, according to the present invention, a plurality of mounting chips fixed at predetermined positions with respect to a semi-open saddle type high frequency induction heating coil are provided on a crankshaft. The high frequency induction heating coil is placed on the cylindrical peripheral surface of the pin portion or the journal portion so as to correspond to the cylindrical peripheral surface with a required gap between the high frequency induction heating coil and the cylindrical peripheral surface. And then rotating the crankshaft about its axis to cause the high-frequency induction heating coil to follow the pin or journal to heat the pin or journal with high-frequency induction. In the high-frequency induction heating method, the pin portion or the journal portion is subjected to high-frequency induction heating while the high-frequency induction heating coil follows the pin portion or the journal portion. When applying, a horizontal urging force is always applied to the combination of the high-frequency induction heating coil and the plurality of mounting chips, and the urging force causes the combination to be disposed on one side of the plurality of mounting chips. The mounting tip is pressed against the cylindrical peripheral surface of the pin portion or the journal portion. Further, in the present invention, (a) a rotary drive mechanism for rotating a crankshaft as a body to be heated about its axis, and (b) a semi-open saddle type for high-frequency induction heating of a pin portion or a journal portion of the crankshaft. (C) a plurality of mounting chips arranged for mounting the high-frequency induction heating coil on the cylindrical peripheral surface of the pin portion or the journal portion with a required gap; (D) the high frequency induction heating coil mounted on the cylindrical peripheral surface of the pin portion or the journal portion via the mounting tip described above, the pin portion of the crankshaft being rotationally driven by the rotary drive mechanism; Or (e) an urging force applying means for applying a horizontal urging force to a combination of the high-frequency induction heating coil and the plurality of mounting chips. Provided, respectively,
When the pin portion or the journal portion is subjected to high-frequency induction heating while the high-frequency induction heating coil follows the pin portion or the journal portion, a horizontal urging force is always applied to the assembly by the urging force applying means. It is configured as follows. That is, in the present invention, in order to perform high-frequency induction heating of several types of pins or journals having different diameters with the same high-frequency induction heating coil, an urging force applying means is provided, and the high-frequency induction heating coil In addition, a horizontal biasing force is applied to the combination of the mounting chips so that the mounting chip on one side is pressed against the cylindrical peripheral surface of the pin portion or the journal portion to follow. Further, in the present invention, the urging force applying means is provided in the following mechanism. Further, in the present invention, the urging force applying means is constituted by a cylinder device, and by adjusting a fluid pressure which is an operation source of the cylinder device, a horizontal urging force acting on the union from the cylinder device is adjusted. I try to adjust it. Further, in the present invention, the biasing force in the horizontal direction from the cylinder device is configured not to act on the combination until the high-frequency induction heating coil is placed on the pin portion or the journal portion. I have. In the present invention, a spring is provided as the urging force applying means. Further, in the present invention, a pressing means for canceling a horizontal biasing force from the spring is provided, and the pressing means of the spring is pressed by the pressing means until the high-frequency induction heating coil is placed on the pin portion or the journal portion. It is configured such that the biasing force is canceled and the union is not changed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIGS. 1 to 5, the same parts as those in FIGS. 6 to 9 are denoted by the same reference numerals, and redundant description will be omitted.

FIGS. 1 and 2 show a high-frequency induction heating apparatus 10 according to the present invention, which is used to carry out the high-frequency induction heating method for a crankshaft according to the present invention.
This high-frequency induction heating apparatus 10 is for performing high-frequency induction heating to a required quenching or tempering temperature when the pins P _{1 to} P ₄ of the crankshaft 1 are quenched or tempered.

The high-frequency induction heating apparatus 10 according to the present embodiment comprises:
The configuration is such that the urging force applying means 11 is added to the conventional high frequency induction heating device 2. That is, the present device 10
, The semi-open saddle which a rotary drive mechanism for rotating the crankshaft 1 is heated body about its axis X (not shown), respectively high frequency induction heating of the pin portion P ₁ to P ₄ of the crank shaft 1 High frequency induction heating coils 3a-3
d and, these high frequency induction plurality of placing chips arranged for placement with a predetermined gap a heating coil 3a~3d on the cylindrical peripheral surface of the pin portion P ₁ ~P ₄ α 5a~
And 5c, the high-frequency induction heating coil 3a~3d placed respectively on the cylindrical peripheral surface α of the pin portion P ₁ to P ₄ via these mounting chip bodies 5a to 5c, by the rotary drive mechanism Pin part P of crankshaft 1 driven to rotate
Together comprise ₁ to P ₄ of the follow-up mechanism 8 comprising a four-side link type of the link mechanism to follow the rotational movement, respectively, further, the biasing force applying means for applying a horizontal force of the force to the high-frequency induction heating coil 3a~3d 11 is provided. The high-frequency induction heating coils 3a to 3d and the mounting chips 5a to 5c are mounted between a pair of side plates 4, and the high-frequency induction heating coils 3a to 3d and the mounting chips 5a to 3d are mounted.
A combined body S is formed by integrally combining a to 5c and a pair of side plates 4.

In the present embodiment, a cylinder device 12 is used as the urging force applying means 11, and the cylinder device 12 is disposed in the following mechanism 8 including a parallelogram link mechanism. More specifically, the cylinder body 12a of the cylinder device 12 is fixed to a link arm 8a that forms the upper side of the follow-up mechanism 8, and is an operating rod (cylinder rod) 12b that is driven to expand and contract with respect to the cylinder body 12a. Are arranged corresponding to the link arm 8b which constitutes one side of the following mechanism 8. The cylinder device 12 is provided with the pressure regulating regulator 1.
3 is connected to a pressure source (operating source) via a pressure regulator 3, and the fluid pressure (for example, the pressure of compressed air), which is the operating source of the cylinder device 12, is adjusted by a pressure adjusting regulator 13. The magnitude of the horizontal urging force acting on the union S via the following mechanism 8 from the operating rod 12b can be adjusted.

On the other hand, when the cylinder device 12 is not operating,
The operating rod 12b of the cylinder device 12 is as shown in FIG.
To the retracted position (retracted position).
To be located away from the link arm 8b.
Has become. Further, the operating rod 1 of the cylinder device 12
2b, the high frequency induction heating coils 3a to 3d ₁
~ P_FourHeld in the retracted position until it is placed on the
As a result, the high-frequency induction heating coils 3a to 3d₁
~ P_FourChange the position of the union S until it is placed on the
So that no horizontal biasing force is applied.
Have been.

[0019] Thus, in the high-frequency induction heating apparatus 10 of the present embodiment, while follow the high-frequency induction heating coil 3a~3b the rotation of the pin portion P ₁ to P ₄ pin portion P
When the high-frequency induction heating of P _{1 to} P ₄ is performed, the urging force applying means 1
In the cylinder device 12, which is 1, the assembly S (therefore, the high-frequency induction heating coils 3a to 3d and the mounting chips 5a to 5d).
5b) is configured such that a horizontal biasing force is always applied.

Next, the above-described high-frequency induction heating device 10 is used.
And the pin P of the crankshaft 1 ₁~ P_FourThe high frequency induction
Describing the procedure and operation when conducting heating,
It is on the street. Here, the crankshaft 1
Part P₁(Outer diameter: D2) for outer diameter D1 (however, D1> D
2) High frequency induction heating by high frequency induction heating coil 3a
The case will be described as an example.

First, the high-frequency induction heating device 10 is arranged at a standby position shown in FIG. 1, and is locked at a predetermined standby position by a descent prevention means (not shown). At this time, the cylinder device 12 is brought into the non-operation state, and the operation rod 12b is arranged at the retracted position, and accordingly, the operation rod 12b is arranged at a position (non-pressing position) apart from the link arm 8b of the following mechanism 8. . On the other hand, the crankshaft 1, which is the object to be heated, is held horizontally by a chucking device (not shown).

Next, the high-frequency induction heating device 10 is moved downward by an elevating device (not shown), and accordingly, the mounting tip 5b at the upper center for regulating the position in the vertical direction is moved to the pin portion P of the crankshaft 1. is placed on the top of the _first cylindrical peripheral surface α high-frequency induction heating coil 3a is corresponding disposed over the position of the pin portion P _1. When high-frequency induction heating coil 3a this way is placed on the pin portion P _1, compressed air is supplied to the cylinder device 12 from the pressure adjusting regulator 13, the operating rod 12b of the cylinder device 12
Is driven to the extension position (projection position), and this operating rod 1
2 to the link arm 8b of the following mechanism 8 is continuously applied with a biasing force of a predetermined size toward one side in the horizontal direction (a pressing force toward the left in FIG. 2). Thus, the right-side mounting chip 5a of the mounting chips 5a and 5c that regulates the position in the horizontal direction (horizontal direction) by this urging force has the pin portion P _{1 as} shown in FIGS. Is forcibly pressed from the side to the cylindrical peripheral surface α (the gap β disappears), and this pressed state, that is, the urging force applied state is maintained. The urging force (pressing force) at this time can be adjusted to an appropriate pressure by the pressure adjusting regulator 13. This biasing force, in consideration of the frictional force between the pin portion P ₁ of the mounting tip 5b and the crankshaft 1, the direction of the force is determined by the direction of rotation of the crankshaft 1.

Thereafter, the crankshaft 1 is rotationally driven at a predetermined rotational speed about its axis X by a rotational drive mechanism (not shown), and accordingly, the pin portion P ₁ is rotated about the axis X by the crankshaft 1. Is driven to rotate with a half stroke as a radius. Then, is swung to follow the pin portion P ₁ high-frequency induction heating coil 3a is a follow-up mechanism 8. The following operation at this time is performed as shown in FIGS. That is, of the three mounting chips 3a to 3c, the mounting chip 5b at the upper center and the mounting chip 5 on the right side
a, the high-frequency induction heating coil 3a is connected to the pin portion P ₁ under the condition that only two of the pin portions P ₁ are always in contact with the cylindrical peripheral surface α of the pin portion P _1.
Follow. In this case, the left mounting chip 5c
Even if there is a gap γ between the pin portion P _{1 and} the cylindrical peripheral surface α, the gap is always kept constant by the urging force constantly applied from the cylinder device 12.

On the other hand, the follow-up movement of the high-frequency induction heating coil 3
At the same time as the start, the high-frequency induction heating coil 3a
High frequency current from the high frequency power supply via the disk transformer 6a
Is supplied and the pin P₁Is subjected to high frequency induction heating. this
When the pin P₁High-frequency induction placed on the cylindrical peripheral surface α of
After the induction heating coil 3a is in the state of FIG.
4 (B), (C) and (D) are sequentially moved.
You. At this time, the pin P ₁And between the mounting tip 5c
One revolution of crankshaft 1 even if gap γ exists
Each time the pin P₁Each part of the entire circumference of the cylindrical peripheral surface α must be
The closest approach to the high frequency induction heating coil 3a only once
Place (place near the mounting chip 5a) with a predetermined gap
The pin P₁All around
High frequency induction heating.

Next, after the high-frequency induction heating is completed,
Are energized a stop to high frequency induction heating coil 3a, hardened layer is formed coolant from the coolant injection jacket pin portion P _1, not shown in the immediately is injected.

The condensate this way quenching treatment of the pin portion P ₁ is completed, the rotation of the crank shaft 1 is stopped, the cylinder device 12 is operating rod 12b is retracted position is switched to the inoperative state again Be moved. afterwards,
The high-frequency induction heating device 10 is moved up by an elevating device (not shown) and is placed in a standby position in a locked state. Then, the quenched or tempered crankshaft 1 is transferred to a journal heating station in the next step by a transfer device (not shown).

According to such a high-frequency induction heating method and apparatus, so as to constantly impart a biasing force in the horizontal direction of the appropriate size to the combined product S by the cylinder device 12 during the high frequency induction heating pin portion P ₁ The mounting chips 5a, 5 for regulating the position in the horizontal direction (left-right direction).
Even if the interval is greater than this without matching the outer diameter (D2) of the pin portion P ₁ to be heated between c, i.e.置用mounting a cylindrical circumferential surface of the pin portion P ₁ alpha chip 5c Even if there is a gap between them, high-frequency induction heating can be performed smoothly. Therefore, only it is not necessary to prepare a high-frequency induction heating coil individually, the pin portion P ₁ of a plurality of types having different diameters one high-frequency induction heating coil 3a in accordance with the magnitude of the outer diameter of the pin portion P ₁ It is possible to perform high frequency induction heating. Therefore, the high-frequency induction heating coil 3a
Can be shared (generalized).

FIG. 5 shows a high-frequency induction heating apparatus 20 according to another embodiment of the present invention. This device 2
0, the spring 2
1 is provided, and a cylinder device 22 is provided as a pressing means for canceling the urging force of the spring 21. The other configuration is the same as that of the above-described embodiment.

The above-mentioned spring 21 is composed of, for example, a compression coil spring, and includes a fixed plate 23 fixed to the link arm 8a of the following mechanism 8, and a link arm 8c facing the link arm 8a of the following mechanism 8. It is hung between. At the time of high-frequency induction heating, the urging force of the spring 21 (the rightward pressing force in FIG. 5) is applied to the combination S via the link arm 8c, and the mounting tip 5c on the left side is moved to the pin portion P. ₁ cylindrical peripheral surface α
It is configured to be forcibly pressed from the side. When the cylinder device 22 is switched to the operating state by the pressure adjusting regulator 24, a pressing force toward the left in FIG. 5 is applied from the cylinder device 22 to the link arm 8b.
1 is compressed to cancel the biasing force of the spring 21 acting on the link arm 8c. Thus, the spring 21 is connected to the high-frequency induction heating coil 3a.
There is compressed by the cylinder device 22 to be placed over the pin portion P _1, high-frequency induction heating coil 3a pin portion P ₁
It is configured such that the positions of the high-frequency induction heating coil 3a and the mounting chip 5c are not changed until the high-frequency induction heating coil 3a and the mounting chip 5c are mounted.

The high-frequency induction heating apparatus 2 configured as described above
According to 0, the same operation and effect as the high-frequency induction heating device 10 described above can be obtained.

Although the two embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made based on the technical idea of the present invention. . For example, the arrangement position of the cylinder device 12 and the manner of applying the urging force to the follow-up mechanism 8 can be variously changed. As the spring 21, a tension coil spring or a leaf spring can be used instead of a compression coil spring. It is. Further, the present invention is applicable not only to the case where the number of mounting chips is three, but also to the case where the number of mounting chips is four or more. Further, the present invention is applicable to a case where the journals J1 to J5 of the crankshaft 1 are subjected to high-frequency induction heating for quenching or tempering, and is not limited to the crankshaft 1 for a four-cylinder engine. Cylinder and 6
The present invention is also applicable to a case where high-frequency induction heating is performed on a cylinder engine or another engine crankshaft.

[0032]

As described above, the high-frequency induction heating method for a crankshaft according to the present invention is characterized in that when the high-frequency induction heating coil is caused to follow the pin portion or the journal portion, the high-frequency induction heating coil is placed in a horizontal direction. Of the plurality of mounting chips is forcibly pressed against the cylindrical peripheral surface of the pin portion or the journal portion by the biasing force. Therefore, even if there is a gap between the mounting chips on the left and right in the horizontal direction and the pin or the journal as the heated portion, the biasing force removes the cap on one side, and In a state where the interval between the high-frequency induction heating coil and the cylindrical peripheral surface of the pin portion or the journal portion is kept constant, the entire peripheral surface can be uniformly subjected to the high-frequency induction heating. Therefore, high-frequency induction heating can be smoothly and reliably performed on a plurality of types of pins or journals having different diameters using one type (having the same dimensions and shape) of high-frequency induction heating coils. For this reason, it is not necessary to prepare a plurality of types of dedicated high-frequency induction heating coils corresponding to the diameters of the pin portion or the journal portion, respectively, and it is possible to share the high-frequency induction heating coil (general use).

Therefore, according to the present invention, when it is necessary to quench or temper pin portions or journal portions having different diameters, and when it is necessary to quench various types of engine crankshafts. The number of types of high-frequency induction heating coils that must be prepared can be minimized. In addition, the frequency at which the placement position of the mounting tip is changed according to the outer diameter of the pin or the journal to be subjected to high-frequency induction heating can be reduced. Further, collision between the pin portion or the journal portion of the crankshaft and the mounting tip can be avoided, and the life of the mounting tip can be extended.

The high-frequency induction heating apparatus for a crankshaft according to the present invention further comprises an urging force applying means for applying a horizontal urging force to a combination of the high-frequency induction heating coil and the plurality of mounting chips. When the pin portion or the journal portion is subjected to high-frequency induction heating while causing the induction heating coil to follow the pin portion or the journal portion, a biasing force applying means is configured to always apply a horizontal biasing force to the assembly by the biasing force applying means. Therefore, according to the high frequency induction heating apparatus of the present invention, the outer diameter of the pin portion or the journal portion of the crankshaft is D2 (D1 (D1
> D2) can be subjected to high-frequency induction heating of the pin portion or the journal portion. That is, when there are many types of crankshafts to be subjected to high-frequency induction heating, and when the outer diameters of the pin portions or journal portions to be heated are different from each other, a high-frequency induction heating coil or a high-frequency induction heating device (where the mounting chip is fixed) (High-frequency induction heating device) can be shared, and the number of types of high-frequency induction heating coils to be prepared can be reduced. Further, conventionally, it was necessary to replace a pin or a journal having a different outer diameter with a dedicated high-frequency induction heating coil every time the high-frequency induction heating coil was used. Since it is not necessary to replace each coil, the frequency of replacing the high-frequency induction heating coil can be reduced. Furthermore, especially when it is necessary to perform high frequency induction heating for quenching or tempering several kinds of crankshafts in a fully automatic manner, a high frequency induction heating coil such as a disk transformer for supplying a predetermined high frequency current to the high frequency induction heating coil. The number of types of parts other than the above can also be reduced.

Further, there is an advantage that a simple and inexpensive structure can be achieved simply by using a cylinder device or a spring as the urging force applying means. Further, according to the present invention, until the high-frequency induction heating coil is placed on the pin portion or the journal portion, the horizontal biasing force of the cylinder device or the spring is not applied or the combination is not changed. With this configuration, it is possible to prevent the occurrence of a problem that hinders the mounting operation of the high-frequency induction heating coil on the pin portion or the journal portion.

[Brief description of the drawings]

FIG. 1 is a side view of a high-frequency induction heating apparatus of the present invention used for carrying out a high-frequency induction heating method for a crankshaft according to the present invention.

FIG. 2 is an enlarged side view showing a main part of the high-frequency induction heating device of FIG.

FIGS. 3A to 3D are front views showing an operation when the high-frequency induction heating coil follows a pin portion of a crankshaft.

4 (A) to 4 (D) show the positional relationship between the high frequency induction heating coil and the mounting tip and the pin portion of the crankshaft when the high frequency induction heating coil follows the pin portion of the crankshaft. FIG.

FIG. 5 is a front view of a high-frequency induction heating device according to another embodiment of the present invention.

FIG. 6 is a side view showing a conventional high-frequency induction heating device for a crankshaft.

FIG. 7 is a front view of the high-frequency induction heating device of FIG. 6;

FIG. 8 is an enlarged side view showing a main part of the high-frequency induction heating device of FIG. 6;

FIG. 9 is a side view similar to FIG. 8, showing a state in which a gap is formed between left and right mounting tips and a pin portion of a crankshaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 14 Four-cylinder engine crankshaft 3a-3d High frequency induction heating coil 4 Side plate 5a-5c Mounting chip 8 Follow-up mechanism (parallelogram link mechanism) 8a-8c Link arm 10, 20 High frequency induction heating device 11 Energizing means DESCRIPTION OF SYMBOLS 12 Cylinder device 13 Regulator for pressure adjustment 21 Spring 22 Cylinder device (pressing means) 24 Regulator for pressure adjustment S combination α Cylindrical peripheral surface of pin portion β, γ Gap

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C21D 9/30 C21D 9/30 B H05B 6/10 371 H05B 6/10 371

Claims (7)

[Claims] A plurality of mounting chips fixed at predetermined positions with respect to a semi-open saddle type high frequency induction heating coil are mounted on a cylindrical peripheral surface of a pin portion or a journal portion of a crankshaft. Thereby, the high-frequency induction heating coil is disposed corresponding to the cylindrical peripheral surface with a required gap between the coil and the cylindrical peripheral surface, and then the crankshaft is rotated about its axis. In a high-frequency induction heating method for a crankshaft, wherein the high-frequency induction heating coil is subjected to high-frequency induction heating of the pin portion or the journal portion while following the pin portion or the journal portion, the high-frequency induction heating coil may be connected to the pin portion or the journal. When the pin portion or the journal portion is subjected to high-frequency induction heating while following the portion, the high-frequency induction heating coil and the plurality of A horizontal urging force is constantly applied to the union of the tips, and the urging force causes the mounting chips arranged on one side of the plurality of mounting chips to be in the cylindrical periphery of the pin portion or the journal portion. A high-frequency induction heating method for a crankshaft, characterized in that it is pressed against a surface. 2. A rotary drive mechanism for rotating a crankshaft as an object to be heated about an axis thereof,
(B) a semi-open saddle-type high-frequency induction heating coil for high-frequency induction heating of a pin portion or a journal portion of a crankshaft; and (c) the high-frequency induction heating coil is required on the cylindrical peripheral surface of the pin portion or the journal portion. A plurality of mounting chips arranged for mounting with a gap of (d);
The high frequency induction heating coil mounted on the cylindrical peripheral surface of the pin portion or the journal portion via the mounting tip, the pin portion or the journal portion of the crankshaft that is rotationally driven by the rotation driving mechanism. And (e) urging means for applying a horizontal urging force to a combination of the high-frequency induction heating coil and the plurality of mounting chips. When the pin portion or the journal portion is subjected to high-frequency induction heating while causing the coil to follow the pin portion or the journal portion, the biasing force applying means constantly applies a horizontal biasing force to the assembly. A high frequency induction heating apparatus for a crankshaft, characterized in that: 3. The high-frequency induction heating apparatus for a crankshaft according to claim 2, wherein said urging force applying means is provided in said follow-up mechanism. 4. The biasing force applying means is constituted by a cylinder device, and a horizontal biasing force acting on the assembly from the cylinder device is adjusted by adjusting a fluid pressure which is an operation source of the cylinder device. The high-frequency induction heating apparatus for a crankshaft according to claim 2 or 3, wherein the heating is performed. 5. A structure in which a horizontal urging force from the cylinder device is not applied to the assembly until the high-frequency induction heating coil is mounted on the pin portion or the journal portion. The high-frequency induction heating apparatus for a crankshaft according to claim 4, wherein: 6. A high-frequency induction heating apparatus for a crankshaft according to claim 2, wherein a spring is provided as said urging force applying means. 7. A pressing means for canceling a horizontal biasing force from the spring is provided, and until the high-frequency induction heating coil is mounted on the pin portion or the journal portion.
7. The high-frequency induction heating apparatus for a crankshaft according to claim 6, wherein the urging force of the spring is canceled by the pressing means so that the combination is not changed.