JP2684484B2 - High-frequency heating device for axial work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is designed to rotate a shaft-like work.
Induction heating equipment for shaft-shaped workpieces that are partially induction hardened
About the installation.

[0002]

2. Description of the Related Art A conventional technique will be described below with reference to the drawings. 2 is a schematic perspective view of an induction heating coil (hereinafter also simply referred to as a heating coil) and a current transformer, FIG. 3 is a front view of the induction hardening apparatus, FIG. 4 is a side view of the induction hardening apparatus, and FIG. It is explanatory drawing of the conventional induction hardening method and apparatus of a shaft-shaped workpiece.

As shown in FIG. 5, the shaft-shaped workpiece 50 has a first
The shaft portion 51 and the second shaft portion 52 integrally formed with the first shaft portion 51 and having a diameter larger than that of the first shaft portion 51, and the second shaft portion 52 of the second shaft portion 52 so as to follow the peripheral surface 51a of the first shaft portion 51. An annular recess formed on the side surface 52a
53 and.

The heated surface is the recess 53 and the peripheral surface 51a, and the heating coil 10 for simultaneously heating these heated surfaces corresponds to the shape of the recess 53 as shown in FIGS. The first heating conductor 11 having a substantially ½ arc shape formed on the first heating conductor 11 and one end thereof connected to both ends of the first heating conductor 11, respectively, and the first shaft portion.
A pair of second heating conductors 12, 12 formed so as to correspond to the shape of the peripheral surface 51a of 51, and one end of each of the second heating conductors 12, 12 is connected to the other end of the second heating conductors 12, 12 and is approximately a quarter circle. It is provided with a pair of arc-shaped third heating conductors 13, 13 and a pair of power supply conductors 18, 18 each having one end connected to the other end of the third heating conductors 13, 13.

The other ends of the power supply conductors 18, 18 are current transformers 19 supplied with a high frequency current from a high frequency power source (not shown).
Is connected to the output side. A magnetic core 14 serves to focus the magnetic flux generated by the first heating conductor 11 on the surface of the recess 53.

The induction hardening apparatus shown in FIGS. 3 and 4 includes a tank 60 containing a cooling liquid L and a work moving apparatus 70. The work moving device 70 includes a shaft 72 supported by a pair of bearings 71 provided on the side wall 61 of the tank 60,
A pair of work holding members 73 attached to the shaft 72
And a motor 79 attached to one end of the shaft 72. The motor 79 is fixed on a base 78 provided on the side wall 61 of the tank 60.

Each work holding member 73 has three work holding plates 74 protruding from the shaft 72 at intervals of 120 degrees about the shaft 72. One work holding member 73 has one work holding plate 74. A chuck 42 is provided, and a work holding plate 74 of the other work holding member 73 is provided with a center 41. A work holding plate 74 is arranged so that the chuck 42 and the center 41 face each other.

The work holding member 73 is rotated by the motor 79, and returns to the receiving and removing station A again via the receiving and removing station A, the heating station B and the cooling station C. The work moving device 70 is provided with a work rotating mechanism (not shown) for rotating each chuck 42. Further, the center 41 is provided with a clamp mechanism (not shown), and the work is supported by spring pressure.

The workpiece 50 horizontally held between the workpiece holding plates 74 by the chuck 42 and the center 41 at the receiving / removing station A is heated by the motor 79 rotating the workpiece holding member 73 in the direction of arrow K. To B. Then, the work rotation mechanism causes the work to rotate.
50 rotations are started. Next, the heating coil 10 is lowered toward the work 50 in the direction of arrow P by the heating coil transfer means (not shown), and the second heating conductor 12 of the heating coil 10 is attached to the peripheral surface of the first shaft portion 51 of the work 50. Stop descending at a position close to 51a. Thereafter, the heating coil transfer means further moves the heating coil 10 in the direction of the arrow Q, that is, in the direction of the axis 59, so that the first heating conductor 11 is recessed 53.
To face to.

Next, a current transformer is attached to the heating coil 10.
High-frequency current is supplied from 19 for a certain period of time to form a recess 53 and a peripheral surface 51a.
After the heating is completed, the heating coil transfer means moves the heating coil 10 in the direction opposite to the arrow Q and then in the direction opposite to the arrow P to restore the original standby position.

When the heating coil 10 returns to the standby position, the motor 79 rotates the work holding member 73 to move the work 50 to the cooling station C. Cooling station C
Then, the work 50 is immersed in the cooling liquid L to be cooled,
A hardened layer 58 is formed on the recess 53 and the peripheral surface 51a. work
When the cooling of the work 50 is completed, the work holding member 73 is rotated by the motor 79 so that the work 50 is received and removed at the station A.
Then, the hardened work 50 is removed, and a new work 50 is attached to the work holding member 73.

[0012]

However, such a heating method has the following problems. That is, when the heating coil 10 is brought closer to the surface to be heated, as described above, first, the heating coil 10 is moved in the direction of the arrow P and then in the direction of the arrow Q perpendicular to the direction of the arrow P. Further, after the heating is completed, it is moved in the direction opposite to arrow Q and then in the direction opposite to arrow P.

That is, when the heating coil 10 approaches the surface to be heated and when it returns to the standby position, so-called two-step motion must be performed. Takes. Also, the work is moved to the cooling station after the heating coil returns to the standby position or after the heating coil is separated from the work by a predetermined distance. It takes time for the work to reach from the heating station to the cooling station. Therefore, not only the quenching process becomes long, but also a predetermined quenching depth cannot be obtained. Further, since the heating coil transfer means requires two devices, a device for moving the heating coil in the direction of arrow P and a device for moving the heating coil in the direction of arrow Q,
There is a problem that the structure of the high-frequency heating device becomes complicated and the cost becomes high.

On the other hand, it is conceivable to move and quench the peripheral surface 51a and the recess 53 with an annular high-frequency heating coil instead of using the high-frequency heating device as described above. Insufficient heating due to recess 53 to peripheral surface 51
The depth of the hardened layer formed over a is not uniform, the heating process is lengthened by the time required for the high-frequency heating coil to return to the moving and quenching start position, and it is troublesome to insert the work into the heating coil. There is a problem that it takes time.

The present invention was devised in view of the above circumstances, and has a high circumference of a shaft-like work which can eliminate the above-mentioned drawbacks.
The object is to provide a wave heating device .

[0016]

A high-frequency heating apparatus for a shaft-shaped workpiece according to the present invention has a shaft-shaped structure in which a recess is formed in a corner portion of a flange shaft between the flange and the shaft around the corner. In a high-frequency heating device for a shaft-shaped work, in which the work is rotated to perform induction hardening of the recess and the shaft peripheral surface, an arc-shaped conductor for quenching the recess of the shaft-shaped work and a straight line for hardening the shaft peripheral surface. A heating coil having a conductor formed therein, a four-node rotation mechanism disposed near the shaft-like work and supporting the heating coil in an oblique direction from a retracted position to a heating position, and a four-node rotation mechanism. And a power source for moving the heating coil from the retracted position to the heating position through the motion of the four-node rotation mechanism, the four-node rotation mechanism being connected to the power source.
And a movable member to which the heating coil is attached, and a movable portion.
The fixed member and the movable member, which are arranged parallel to the material,
It is composed of a link connecting the fixed member and the fixed member.

That is, when the power source is activated, the heating coil
Moves from the retracted position to the heated position through the movement of the 4-bar rotation mechanism.
Moving. In this heating state, the recess of the shaft-shaped workpiece and the shaft circumference
On the surface, the arc-shaped conductor part and the linear conductor part of the heating coil are respectively
They are facing each other, and current is passed through the heating coil, and
When the arc is rotated, its recess and shaft peripheral surface are hardened.
You. When quenching is completed and the power source is reversely operated, it will heat up.
The coil retracts from the heating position via the movement of the four-bar rotation mechanism.
Move to position.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a high frequency heating apparatus capable of realizing the high frequency heating method for a shaft-like work according to the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of this embodiment, and the same components as those described in FIGS. 2 to 5 are designated by the same reference numerals. In addition, the heating coil 1 used in this embodiment
0, current transformer 19, picked up work 50, tank 6
0 and the work moving device 70 are the same as those described above, and thus the description thereof is omitted.

As shown in FIG. 1, the current transformer 19
Are fixed on a horizontal transformer mount 21. The high-frequency heating apparatus of this embodiment is provided with a heating coil moving device 20 as a means for moving the heating coil 10 and the current transformer 19 to bring them closer to the work 50 and returning them to the standby position.

The heating coil moving device 20 is provided with a transformer mounting base 21 having a current transformer 19 fixed to the upper surface thereof, a transformer supporting column 22, and a cylinder 28. One end of a transformer support column 22 is rotatably connected to both ends of the transformer mount 21 via pins 23, respectively. The other end of the transformer support column 22 is rotatably connected via a pin 24 to a transformer support member 25 protruding from the support surface H of the high-frequency heating apparatus of this embodiment.

One end of a cylinder 28 which is operated by air pressure or the like is rotatably attached to a cylinder attachment member 29a fixed to the support surface H by a pin 29, and a rod 27 which advances and retracts from the other end of the cylinder 28. The tip of pin 26
Is rotatably attached to one end of the transformer mount 21.

The length of the transformer support column 22 and the position of the transformer support member 25 are such that the heating conductors 11 and 12 of the heating coil 10 are located at the heating station when the cylinder 28 is operated and the rod 27 is advanced. It is selected to stop at a position close to and facing the recess 53 and the peripheral surface 51a of the workpiece 50 that has arrived. In short, heating carp
In the moving device 20, all four links are rotated and connected in pairs.
4-bar rotation mechanism (sometimes called a four-bar link mechanism)
This is equivalent to the
The heating coil mounted on the transformer mounting base 21 according to this
Heating the foil 10 from the standby position (the position shown by the solid line in FIG. 1)
Station (heating position: position shown by broken line in Fig. 1)
It is configured to move diagonally alternately.
You.

Next, the operation of this embodiment will be described. However,
Only the differences from the operation of the heating coil 10 described in the conventional induction hardening apparatus will be described. When the work 50 reaches the heating station B and starts to rotate, the cylinder 28 is operated and the rod 27 is advanced. Then, the heating conductor 11 of the heating coil 10 falls in the recess 53 of the second shaft portion 52 of the work 50 from an obliquely upper position and stops at a position close to and opposed to the recess 53. Similarly, the heating conductor 12 also descends obliquely from above and stops at a position close to and facing the peripheral surface 51a of the first shaft portion 51.

A high frequency current is supplied to the heating coil 10 from the current transformer 19 for a predetermined time to complete the heating of the recess 53 and the peripheral surface 51a. Then, when the cylinder 28 is operated to retract the rod 27, the heating coil 10 moves in the direction opposite to the arrow J,
That is, it is moved diagonally upward and returns to the original standby position.

In this embodiment, when the heating coil 10 approaches the surface to be heated and when it returns to the standby position, the cylinder 28 is operated to move the rod 27 forward and backward, and the one-step motion is performed. Is only a heating coil
While the heating conductors 11 and 12 of 10 both draw an arc, they approach the recess 53 and the peripheral surface 51a from diagonally above, and also move away diagonally above. Therefore, since the time required for the heating coil 10 to come in and out of contact with the surface to be heated is short, the movement time of the heating coil 10 itself is short. Also, after heating the workpiece 50,
Since the transfer of 50 to the cooling station C can be started quickly, a predetermined quenching depth can be obtained and the quenching process can be shortened.

In this embodiment, the work 50 is cooled at a place different from the heating position, but depending on the material of the work,
Cooling may also be provided by the spray jacket in the heating position.

[0027]

As described above, the high circumference of the shaft-like work according to the present invention is obtained.
When using the wave heating device, the heating coil heats from the retracted position.
Axial workpiece by moving diagonally to the position
It is configured to approach and leave at the shortest distance with respect to
Therefore, the time required to move the heating coil can be shortened.
You. Therefore, the quenching process is shortened and the required quenching depth
Can also be obtained. Moreover, when moving the heating coil
Since it has a configuration that makes good use of the four-bar rotation mechanism,
There is an advantage that the configuration of the device itself becomes simple.

Further, in the high-frequency heating apparatus for a shaft-shaped work according to the present invention, an arc-shaped first heating conductor formed so as to correspond to the shape of the recess and one end thereof is connected to both ends of the first heating conductor, respectively. And a high-frequency voltage is applied between the other ends, and a high-frequency heating coil provided with a pair of second heating conductors formed so as to correspond to the shape of the peripheral surface; A means is provided so as to approach the surface to be heated and face the surface to be heated from a direction between a longitudinal direction and a direction perpendicular to the longitudinal direction.

Therefore, according to the high-frequency heating method and apparatus of the present invention, the heating coil approaches the work from diagonally above, and also moves away from the diagonally above, so that the heating coil approaches and approaches the work. The time to return to the standby position can be shortened. Further, since the time until the start of cooling can be shortened, a predetermined quenching depth can be obtained and the quenching process can be shortened. In addition, the heating coil moving device is simple, and the recess can be sufficiently heated.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of a high-frequency heating device capable of realizing a high-frequency heating method for a shaft-shaped work according to the present invention.

FIG. 2 is a schematic perspective view of a heating coil and a current transformer.

FIG. 3 is a front explanatory view of an induction hardening apparatus.

FIG. 4 is a side view of an induction hardening apparatus.

FIG. 5 is an explanatory diagram of a conventional high-frequency heating method and apparatus for a shaft-shaped work.

[Explanation of symbols]

 10 Heating coil 11, 12 Heating conductor 50 Workpiece 51 First shaft portion 51a Circumferential surface 52 Second shaft portion 52a Side surface 53 Recess

Claims (1)

(57) [Claims] 1. A shaft-shaped workpiece having a structure in which a recess is formed around a corner of the flange shaft between the flange and the shaft around the shaft to perform induction hardening of the recess and the peripheral surface of the shaft. In a high-frequency heating device for a work, a heating coil having an arc-shaped conductor portion for quenching a concave portion of a shaft-shaped workpiece and a linear conductor portion for quenching the axial peripheral surface thereof and a heating coil disposed near the shaft-shaped workpiece are arranged. A four-node rotating mechanism that is installed and supports the heating coil in an oblique direction from the retracted position to the heating position, and a heating coil that is connected to the four-node rotating mechanism and that moves through the motion of the four-node rotating mechanism. and a power source for moving the heating position from the retracted position, and the four-bar mechanism is coupled to said power source
And a movable member to which the heating coil is attached,
A movable member and a fixed member arranged in parallel to the movable member.
Consists of a link connecting the material and the fixing member
A high-frequency heating device for a shaft-shaped work, characterized in that