JPH0253486B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-frequency heating machine used for hardening a workpiece, and more specifically, the present invention relates to a high-frequency heating machine used for hardening a workpiece. The present invention relates to a high-frequency heating machine suitable for heating workpieces having the following properties.

Prior Art FIG. 6 shows a case in which a cam (workpiece) is hardened using a conventional high-frequency heating machine. The cam 60 has an outer circumferential surface 61 having a different radius of curvature in the circumferential direction, and a work coil 70 of a high-frequency heater is provided on the outer side of the outer circumferential surface 61. The work coil 70 is moved by a drive mechanism (not shown) in the X-axis direction and the Y-axis direction, which correspond to the horizontal and vertical directions in the figure, respectively, and heats the outer circumferential surface 61 of the cam 60 while moving. It's getting old. When the outer circumferential surface 61 is heated for a predetermined length of time, a quenching fluid (water or water-soluble oil) is applied to the outer circumferential surface 61 of the cam 60 from a jacket (not shown) connected to the tip of the work coil 70. The cam 60 is quenched with this jet.

Problems to be Solved by the Invention However, in the case of the conventional machine described above, the work coil 70 is moved linearly in two directions, the X-axis direction and the Y-axis direction. When hardening the cam 60, the work coil 70 is heated at the circumferential position of the cam 60.
The separation distance between the tip end surface of the cam 60 and the outer circumferential surface 61 of the cam 60 in the opposing direction (hereinafter referred to as a gap) changes, and the hardening pattern changes, making it impossible to harden uniformly. There was a problem that the quality of subsequent workpieces would be impaired.

That is, in FIG. 6, the work coil 70 is moved from the position indicated by a in the figure to the position b while keeping the vertical distance G ₁ between the left end of the distal end surface of the work coil 70 and the outer circumferential surface 61 constant. Assuming that the cam 60 is moved to the position shown, the gap between the outer circumferential surface 61 of the cam 60 and the center of the tip of the work coil 70 changes from G ₁ to G ₂ , and as a result, the entire tip surface of the work coil 70 As a result, the gap between the outer circumferential surface 61 and the outer circumferential surface 61 will fluctuate.

Incidentally, such a gap variation also occurs when the distance in the vertical direction between the center of the tip of the work coil 70 or the right end of the tip surface and the outer circumferential surface 61 is kept constant during the movement.

The present invention has been made to solve the problems of the prior art, and even when heating a workpiece having inner and outer circumferential surfaces with different radii of curvature in the circumferential direction, the inner and outer circumferential surfaces and the work coil can be heated. An object of the present invention is to provide a high-frequency heating machine that can always maintain a constant gap with the tip surface of the heating device, and as a result can perform homogeneous heating treatment.

Means for Solving the Problems A high-frequency heating machine according to the present invention heats a workpiece having circumferential surfaces with different radii of curvature. A swinging mechanism that swings a work coil that heats a workpiece in a vertical plane, a reciprocating mechanism that moves the swinging mechanism back and forth in a horizontal plane in a horizontal direction orthogonal to the horizontal axis, and a tip of the work coil. and a control device for driving and controlling the rotating mechanism, the swinging mechanism, and the reciprocating mechanism so that the surface directly faces the circumferential surface of the workpiece and the distance between them is always constant.

Here, facing directly means that the tip end surface of the work coil is approximately parallel to the circumferential surface of the work.

Action In such a case, depending on the position on the circumferential surface of the work,
When the swinging mechanism is driven to swing the work coil supported by the swing mechanism by a predetermined amount in a vertical plane and to move it back and forth relative to the work, the cam 60 (work ), the tip surface of the work coil 70 can always be directly opposed to the outer circumferential surface 61 of the cam 60, and the gap G between the tip surface of the work coil 70 and the outer circumferential surface 61 can always be maintained. This means that it can be kept constant.

Embodiments Examples of the present invention will be described below with reference to the drawings.
Fig. 1 is a front view showing a high frequency heating machine according to the present invention, Fig. 2 is a side view thereof, and Fig. 3 is a cross-sectional view of Fig. 2.
FIG. 4 is a view of FIG. 1 viewed from direction B, and FIG. 5 is a diagram illustrating the principle of the present invention.

This high-frequency heating machine is provided to heat and harden the outer circumferential surface 61 of the cam 60, and includes a rotation mechanism 10 that supports the cam 60 and rotates it around a horizontal axis, and a rotation mechanism. 10, that is, a reciprocating mechanism 20 that reciprocates the cam 60 in the left-right direction in the figure, a work coil 70 that heats the outer circumferential surface 61 of the cam 60, and a quenching fluid that is sprayed onto the heated outer circumferential surface 61 to perform quenching. A swinging mechanism 30 includes a jacket 71 that swings the work coil 70 in a vertical plane so that the tip end face of the work coil 70 directly faces the outer circumferential surface 61 of the cam 60; A reciprocating mechanism 40 that reciprocates the oscillating mechanism 30 in the front-back direction in the figure to set a gap with the tip surface, and drive control of the rotating mechanism 10, the reciprocating mechanism 20, the oscillating mechanism 30, and the reciprocating mechanism 40. Also, power is supplied to the work coil 70 and the jacket 71
It has an arithmetic and control device 50 that controls the ejection and stop of ejection of the quenching fluid ejected from the quenching fluid.

The details of each part will be explained below. Rotating mechanism 1
0 is a servo motor 11 having an output shaft (not shown) protruding downward, and a reduction gear connected to the output shaft of the servo motor 11 via a coupling 12, with an output shaft 13a extending to the right. 13 and
It has a chuck 14 connected to the tip of the output shaft 13a and holding a cam 60. When the servo motor 11 is driven, the camshaft 60 held by the chuck 14 is moved to the horizontal axis via the reduction gear 13. It is supposed to rotate around. In addition,
The drive control of the servo motor 11 is performed by an arithmetic control device 50.
The details will be described later.

Furthermore, the chuck 14 is provided with means for holding the cam 60 in a fixed position. That is, as shown in FIG. 3, a positioning pin 15 is provided at a predetermined position in the circumferential direction of the chuck 14 to fit into a positioning hole 62 provided on the left end surface of the cam 60 and to position the cam 60 in the circumferential direction. There is.
This positioning pin 15 is always urged toward the tip side by a coil spring 16. A detection pin 17 is protruded in the radial direction of the chuck 14 on the base end side of the positioning pin 15, and the position of the detection pin 17 is detected on the outer side of the detection pin 17, and this detection signal is transmitted in the circumferential direction of the cam 60. Proximity sensor 18 reports to arithmetic and control unit 50 as an indexed position detection signal at
is provided.

Here, data regarding the hardening start position on the outer circumferential surface 61 of the cam 60 is stored in advance in the arithmetic and control device 50, and the cam 60 is positioned at the hardening start position based on this data and the index position detection signal. The drive control of the servo motor 11 is performed to the best of its ability. The cam 60 is held by gripping the left end shaft portion 63 of the cam 60 with three chuck claws 14a (only one is shown in the drawing) provided on the chuck 14.

Next, the reciprocating mechanism 20 will be explained. This reciprocating mechanism 20 consists of a servo motor 22 attached to the left end of the fixed table 21 and a servo motor 22 attached to the left end of the fixed table 21.
is rotatably supported by bearings 23, 23 provided on the left and right sides of the
a ball screw 24 connected to the ball screw 2;
4, and guide rails 26, 26 provided at the portions of the fixed table 21 corresponding to the front and rear sides of the ball screw 24.
There are a total of 4 blocks 27a rolling on the guide rails 26, 26 on both the front and rear sides and on the left and right sides of the lower surface.
(only two are shown in the drawing) and holding legs 28 that hold the ball nut 25 in the front and back.
b, 28b are vertically disposed. A holding portion 28 for holding the lower part of the reduction gear 13 is provided at the center of the upper surface of the moving plate 28.
c is provided.

Thus, when the servo motor 22 is driven, the ball screw 24 rotates, and the ball nut 25 and the moving plate 28 connected thereto move in the left-right direction. In conjunction with this movement, the reducer 13 held by the holding portion 28c, that is, the entire rotating mechanism 10, moves in the left-right direction. Note that drive control of the servo motor 22 is similarly performed by the arithmetic and control unit 50, and details thereof will be described later.

Next, the swing mechanism 30 will be explained. This swinging mechanism 30 includes a servo motor 36 provided on the left side of the upper front part of the support member 31 whose lower side is wider than the upper side in the front-rear direction, and a servo motor 36 provided in the left-right direction on the upper front side of the support member 31. , a drive shaft 32 that can swing freely in a vertical plane, and a driven shaft (not shown) that is similarly provided below the drive shaft 32 and supports the base end of the work coil 70 at its right end. ), when the servo motor 36 is driven, the drive shaft 32 swings in the vertical plane, and the driven shaft, that is, the work coil 70, which is linked to the drive shaft 32 via the timing belt 39, swings in the vertical plane. The basic structure is such that the front end surface of the jacket 71 attached to the front end of the work coil 70 is always directly opposed to the outer peripheral surface 61 of the cam 60.

Here, the support member 31 includes two support plates 31a,
The support plate 3
There are two flat plates 33a, 33 inside 1a, 31b.
Vertical link 33 formed by connecting b in left and right directions
is provided. The upper and lower ends of the vertical link 33 are connected to the drive shaft 32 and the driven shaft, respectively. flat plate 3
There are two flat plates 34a, 34 inside 3a, 33b.
A horizontal link 34 formed by connecting a to the left and right in an opposing manner.
is provided. The rear end of the horizontal link 34 is connected to the drive shaft 32, and the front end is connected to a gear drive shaft 35 provided in front of the drive shaft 32. The gear drive shaft 35 pivotally supports a drive gear 35a, and its base end is linked to an output shaft (not shown) of a servo motor 36. Then, the flat plate 34a of the drive shaft 32,
The driven gear 3 is located between 34b and 34b from the left side.
7. Drive pulleys 38 are respectively attached, and a driven pulley (not shown) is attached to a portion of the driven shaft corresponding to the drive pulley 38. The driven gear 37 meshes with the drive gear 35a, and the drive pulley 3
An endless timing belt 39 is wound between the timing belt 8 and the driven pulley. Incidentally, a collar (not shown) is interposed between the horizontal link 34, the driven gear 37, and the drive pulley 38, etc., to position them.

Thus, when the servo motor 36 is driven, the driven shaft, that is, the work coil 70 and the jacket 71 supported by the driven shaft, swing in a vertical plane via the driving gear 35a, the driven gear 37, the timing belt 39, etc. ing. Note that the support plate 31
In the swing areas of the drive shaft 32 and the driven shaft of a and 31b, there are guide grooves 130 and 130 that guide the swing of these and regulate the amount of swing (only those provided on the support plate 31b side are shown in the drawing). ) is provided. Here, the amount of rocking of the work coil 70 and the jacket 71, that is, the amount of rotation of the output shaft of the servo motor 36 is:
The arithmetic and control device 50 controls the work coil 70 so that the tip end face of the work coil 70 always faces the outer peripheral surface 61 of the cam 60 which is rotated about the horizontal axis as described above.

The work coil 70 is connected to a high frequency power supply device (not shown) via a transformer 72, and the jacket 71 is connected to a quenching fluid supply source (not shown). The power supply and power supply to the work coil 70 and the supply and supply stop of the quenching fluid to the jacket 71 are controlled by the arithmetic and control unit 50.

Next, the reciprocating mechanism 40 will be explained. This reciprocating mechanism 40 is fitted into the middle part of a servo motor 41 attached to the rear part of the fixed table 21 and a ball screw 41a which is the output shaft of the servo motor 41, and is connected to the lower end part of the support member 31. The servo motor 4 has a ball nut 42 with a
1, the ball screw 41a rotates, and the ball nut 42 moves the support member 31, that is, the work coil 70 and the jacket 71, in accordance with the amount of rotation.
It is designed to move back and forth in the front and rear directions.
Here, the amount of movement of the ball nut 42, that is, the drive control of the servo motor 41, is controlled by the arithmetic control device 50, and specifically, the gap between the tip end surface of the work coil 70 and the outer circumferential surface 61 of the cam 60 is controlled. is controlled to be kept constant at all times while the cam 60 is rotating.

Next, a procedure for hardening the cam 60 using the apparatus of the present invention will be described. First, cam 60 is attached to chuck 14 as described above. Then, the positioning pin 15 will fit into the positioning hole 63, the cam 60 will be positioned with respect to the chuck 14, the proximity sensor 18 will detect the indexed position, and the indexed position detection signal will be reported to the arithmetic and control unit 50. .

When the installation of the cam 60 is completed, the arithmetic and control unit 50 issues a predetermined drive command signal to the servo motor 22, and the ball nut 25 and the rotation mechanism 1
0 to the right to position the cam 60 at the hardening position in the horizontal direction in the figure.

Next, the arithmetic and control device 50 controls the servo motor 41
A predetermined drive command signal is issued to the ball nut 42.
Then, the swinging mechanism 30 is moved forward, and the work coil 70 is positioned so that the tip end face of the work coil 70 maintains a predetermined gap with respect to the cam 60 in the hardening position.

Next, the arithmetic and control unit 50 calculates the amount of rotation of the cam 60 necessary to position the cam 60 at the hardening start position based on the index position detection signal from the proximity sensor 18 and the data regarding the hardening start position. , a predetermined drive command signal is issued to the servo motor 11 to rotate the cam 60 by this amount of rotation.

Next, the arithmetic and control unit 50 controls the servo motor 36
A predetermined drive command signal is issued to drive the swinging mechanism 30, and the tip surface of the work coil 70 is directly opposed to the outer circumferential surface 61 of the cam 60 at the quenching start position,
Thereafter, a predetermined heating command signal is issued to the high frequency power supply device to heat the outer circumferential surface 61, and a predetermined drive command signal is issued to the servo motor 11 to rotate the cam 60 at a preset speed.

When the outer circumferential surface 61 of the cam 60 has been heated for a preset time and length in the circumferential direction, a predetermined quenching fluid supply command signal is issued to the quenching fluid supply source at this point, and the quenching fluid is supplied from the jacket 71. is ejected onto the heated outer circumferential surface 61 to harden this portion.

The heating and subsequent hardening operations are performed over the entire length of the outer circumferential surface 61 in the same manner as described above, but during this operation, the outer circumferential surface 61 and the tip surface of the work coil 70 are always directly opposed to each other. In addition, the arithmetic and control device 50 controls the servo motors 11 and 3 so that the gap between the two always remains constant.
6 and 41 are controlled.

That is, information regarding the profile of the outer circumferential surface 61 of the cam 60 is stored in advance in the arithmetic and control device 50, and the information regarding the profile from the hardening start position is sequentially read out, and the tip surface of the work coil 70 is made to follow this profile. The drive control of the servo motors 11, 36, and 41 is performed as needed. However, due to such control content,
As shown in FIG. 5, even if the position of the outer circumferential surface 61 of the cam 60 to be hardened is different, the tip end surface of the work coil 70 is always facing the outer circumferential surface 61, and the gap between the two is always constant. This means that it can be kept at

When the entire circumferential length of the outer circumferential surface 61 has been hardened, the arithmetic and control unit 50 issues a heating stop command signal and a quenching fluid supply stop command signal to the high frequency power supply device and the quenching fluid supply source, respectively. and stop spouting of quenching fluid.

After that, the servo motor 41 is driven to retract the swinging mechanism 30 backward, and the servo motor 22 is also driven to retract the cam 60 to the left cam removal position, and the cam 60 after hardening is chucked. 14, and the hardening work for one cam 60 is now completed.

In addition, in the above embodiment, the reciprocating mechanism 20 is provided,
Although the cam 60 is set at the hardening position by reciprocating in the left-right direction in the figure, this reciprocating mechanism 20 is not necessarily necessary, and the cam 60 can simply be rotated in the hardening position. Of course, other embodiments may be adopted.

Further, in the above embodiment, the case where the outer circumferential surface 61 of the cam 60 is hardened has been described, but by changing the shape of the work coil 70 in the machine of the present invention, it is formed into a hollow shape, and the inner circumferential surface has the above-mentioned outer circumferential surface. 61
It is also possible to harden a workpiece having a hardened surface with a different radius of curvature in the circumferential direction. That is, by bending the tip of the work coil 70 with the jacket 71 attached thereto into a hook shape, and arranging this bent portion to face the inner circumferential surface, such a work can be hardened.

Furthermore, although the above embodiment describes the case where the cam 60 is hardened, the hardening of a camshaft having a plurality of such cams 60 in the axial direction and each cam 60 having a different phase may also be described. It can be carried out. However, in this case, the arithmetic and control unit 50 stores in advance deviation amount data regarding the amount of phase deviation (deviation angle) of each cam 60 with respect to the indexed position, and this deviation amount data and the index from the proximity sensor 18 are stored in advance. The hardening start position of each cam 60 is calculated based on the position detection signal, and the hardening is performed by performing the same control as described above according to the calculation result.

Furthermore, although the above embodiment describes the case where the machine of the present invention is used to harden a workpiece, it can be similarly applied to other heat treatments such as annealing, and can also be applied to simple heat treatments other than heat treatment. Of course it can be done.

Effects of the Invention According to the machine of the present invention, when heating a workpiece having a circumferential surface with a different radius of curvature in the circumferential direction, the tip surface of the work coil follows changes in the position of the circumferential surface of the workpiece. Since it is possible to always directly face the circumferential surface of the workpiece and to keep the gap between the two constant at all times, it is possible to set the heating conditions around the entire circumference of the workpiece to be substantially constant.
Therefore, for example, when the machine of the present invention is applied to harden a workpiece, it is possible to uniformly harden the entire circumference of the workpiece without causing uneven hardening due to overheating, insufficient heating, etc. Therefore, there is an effect that the quality of the workpiece after heat treatment can be significantly improved.

Further, since such work can be performed substantially automatically, there is also the effect that work efficiency can be improved and labor savings can be achieved.

[Brief explanation of drawings]

Figures 1 to 5 are drawings according to the present invention, in which Figure 1 is a front view showing a high-frequency heating machine according to the present invention, Figure 2 is a side view thereof, and Figure 3 is an illustration of Figure 2.
FIG. 4 is a view of FIG. 1 viewed from direction B, and FIG. 5 is a diagram illustrating the principle of the present invention. FIG. 6 is an explanatory diagram showing a case where a conventional high-frequency heating machine is used to harden a workpiece. 10... Rotating mechanism, 11... Servo motor, 1
4...chuck, 20...reciprocating mechanism, 21...
Fixed table, 22... Servo motor, 24...
Ball screw, 25... Ball nut, 28... Moving plate, 30... Rocking mechanism, 31... Support member, 32... Drive shaft, 35a... Drive gear, 36
... Servo motor, 37 ... Driven gear, 38 ...
Drive pulley, 39... Timing belt, 40...
...Reciprocating mechanism, 41...Servo motor, 41a...
...Ball screw, 42...Ball nut, 50...
Arithmetic control unit, 60... cam, 61... outer peripheral surface,
70...work coil, 71...jacket.

Claims (1)

[Claims] 1. A high-frequency heating machine that heats workpieces having circumferential surfaces with different radii of curvature includes a rotation mechanism that rotates a horizontal shaft that supports the workpiece, and a rocking mechanism that swings a workpiece coil that heats the workpiece in a vertical plane. a reciprocating mechanism for reciprocating the oscillating mechanism in a horizontal plane in a horizontal direction perpendicular to the horizontal axis; A high-frequency heating machine characterized by comprising a control device that controls the driving of the rotating mechanism, the swinging mechanism, and the reciprocating mechanism so that the separation dimension is always constant.