JP4234371B2 - High frequency heating method and high frequency heating apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-frequency heating method and a high-frequency heating device, and more specifically, when a plurality of workpieces having different dimensions such as an engine valve are subjected to high-frequency heating processing, a pair of high-frequency heating coils can handle various types of workpieces. The present invention relates to a high-frequency heating method and a high-frequency heating apparatus that can be used.
[0002]
[Prior art]
Conventionally, preheating is performed on the engine valve in the hot forging process in the manufacturing process of the engine valve and the like. At this time, the heat treatment is performed using a high-frequency heating apparatus including a single high-frequency heating coil regardless of the size and type of the engine valve. That is, the conventional high-frequency heating apparatus includes a high-frequency heating coil corresponding to the maximum dimension of the engine valve. For an engine valve having a size smaller than the maximum dimension, a high-frequency power The heating process is performed by adjusting the current supplied or the applied voltage each time.
[0003]
The positional relationship between the high-frequency heating coil provided in this type of high-frequency heating device and the intermediate product of the engine valve is shown in FIGS. 5A and 5B.
[0004]
In FIG. 5A, the high frequency heating coil 2 provided in the high frequency heating device 1 is positioned with a predetermined gap A with respect to the intermediate product 3a of the engine valve having the maximum diameter Ra. The high-frequency heating coil 2 is disposed so as to oppose the insulating connecting member 4. The intermediate product 3 a is supported by clamps 6 provided on the conveyor 5. Then, the intermediate product 3a is rotated together with the clamp 6 and energized to the high-frequency heating coil 2 from a high-frequency power source (not shown) while being advanced between the high-frequency heating coils 2 arranged opposite to each other. Heat-treated. In this case, the gap A is an optimum gap that is positioned in terms of production efficiency or use efficiency of electric energy when the intermediate product 3a is heat-treated.
[0005]
On the other hand, in FIG. 5B, the intermediate product 3b of the engine valve having the diameter Rb is positioned with a gap B with respect to the high-frequency heating coil 2 provided in the high-frequency heating device 1. The diameter Rb is smaller than the maximum diameter Ra of the intermediate product 3a. Therefore, as easily understood from FIGS. 5A and 5B, the gap B is larger than the gap A described above. In this case, in order to heat the intermediate product 3b, the current applied to the high-frequency heating coil 2 or the applied voltage from the high-frequency power source must be adjusted corresponding to the intermediate product 3b.
[0006]
[Problems to be solved by the invention]
In this way, when the types of engine valves increase and the production amount for each type decreases, the intermediate products 3a, 3b of the engine valves and other intermediate products having different diameters can be changed. The current applied to the high-frequency heating coil 2 from the high-frequency power source or the applied voltage must be adjusted each time, and this adjustment work becomes extremely complicated. As a result, engine valve productivity is significantly hindered.
[0007]
Further, when an intermediate product having a diameter smaller than that of the intermediate product 3a including the intermediate product 3b is heated, the gap becomes larger than the gap A, so that the high-frequency heating coil 2 is energized from the high-frequency power source. Therefore, there is a problem in that the electric current loss or the applied voltage needs to be increased, and as a result, the loss of electric energy increases.
[0008]
The present invention has been made in view of the above-described problem, and when heat-treating a plurality of workpieces having different dimensions, the pair of high-frequency heating coils can correspond to each of the plurality of workpieces having different dimensions, As a result, an object of the present invention is to provide a high-frequency heating method and a high-frequency heating apparatus that can improve the productivity of the workpiece and improve the utilization efficiency of electric energy.
[0009]
[Means for Solving the Problems]
The present invention is a high-frequency heating method for heat-treating a plurality of workpieces having different dimensions, and the pair of high-frequency heating coils and the pair of high-frequency heating coils are moved toward or away from each other along one direction of the workpiece. A first moving mechanism for causing the workpiece to move Intersects the one direction A second moving mechanism that moves the pair of high-frequency heating coils along the other direction, and operates the first moving mechanism to have a predetermined gap with respect to the dimension in one direction of the workpiece. And positioning the pair of high frequency heating coils, operating the second moving mechanism, Above A step of positioning the pair of high-frequency heating coils at a predetermined position with respect to a dimension in the other direction; and energizing the pair of high-frequency heating coils positioned by the first and second moving mechanisms to And a step of heating.
[0010]
According to this high-frequency heating method, when a plurality of workpieces having different dimensions are heat-treated, it is possible to respond by moving a pair of high-frequency heating coils closer to or away from each other. Since it is not necessary to adjust the applied current or the applied voltage each time, the productivity for the workpiece can be improved.
[0011]
In addition, it becomes possible to position a pair of high-frequency heating coils with an optimal gap for each of a plurality of workpieces having different dimensions, and the loss of electrical energy supplied from a high-frequency power source can be extremely reduced. Therefore, the utilization efficiency of electric energy can be improved.
[0012]
Furthermore, the present invention is a high-frequency heating apparatus that heat-treats a plurality of workpieces having different dimensions, and the pair of high-frequency heating coils or the pair of high-frequency heating coils close to each other along one direction of the workpiece. A first moving mechanism for moving the workpiece apart; Intersects the one direction And a second moving mechanism for moving the pair of high-frequency heating coils along the other direction.
[0013]
In this case, the first moving mechanism includes a first driving unit and a first transmitting unit that transmits a driving force of the first driving unit, and the second moving mechanism includes a second driving unit. Means and second transmission means for transmitting the driving force of the second driving means, the first and second Driving means Is supported by a plurality of columnar members First Support member , Second support member In Each attached The first transmission means is urged by the driving force of the first driving means to move the pair of high-frequency heating coils toward or away from each other, and the driving force of the second driving means Energizing the second transmission means, First The pair of high-frequency heating coils together with the support member Along the plurality of columnar members I try to move it.
[0014]
The pair of high-frequency heating coils may be long high-frequency heating coils that are divided and arranged to face each other in order to heat the plurality of workpieces from both sides. Furthermore, the connection of the electric circuit and the cooling fluid circuit to the pair of high-frequency heating coils may be connected to each of the pair of high-frequency heating coils.
[0015]
According to this high-frequency heating device, the pair of high-frequency heating coils can be positioned with an optimal gap with respect to the dimension in one direction of the workpiece by the first moving mechanism. In addition, the second moving mechanism Intersects the one direction A pair of high-frequency heating coils can be positioned at optimum positions with respect to the dimensions in the other direction. As a result, by operating the first moving mechanism and / or the second moving mechanism, it becomes possible to position the pair of high frequency heating coils set for each type of the workpiece, When changing the type of workpiece, the setting of the apparatus can be automated, and the production efficiency of the workpiece can be increased at once.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The high-frequency heating method according to the present invention will be described in detail below with reference to the accompanying drawings by giving preferred embodiments in relation to a high-frequency heating apparatus for carrying out the method.
[0017]
FIG. 1 is a perspective explanatory view of a high-frequency heating device 20 according to an embodiment of the present invention.
[0018]
The high-frequency heating device 20 includes a high-frequency heating coil 22, a first moving mechanism 24, a second moving mechanism 26, a work transfer mechanism 28, and a power supply unit 30. In FIG. 1, reference numeral 32 indicates a hose for circulating the coolant from the coolant circulating means (not shown) to each of the high-frequency heating coils 22.
[0019]
The high-frequency heating coil 22 has heating conductor portions 22 a and 22 b formed in a long shape, and is attached to the first moving mechanism 24. The heating conductor portions 22a and 22b are arranged to face each other so as to sandwich the intermediate product W of the engine valve from both sides. In addition, the flow path (not shown) for distribute | circulating the cooling fluid supplied through the said hose 32 is each provided in these heating conductor parts 22a and 22b.
[0020]
The first moving mechanism 24 includes a first motor 34, a shaft 36 extending from the first motor 34 and rotating together with the first motor 34, a screw shaft 38 rotatably connected to the shaft 36, It has slide blocks 40a and 40b that move toward or away from each other by the rotation of the screw shaft 38, and a guide 42 that slidably supports the slide blocks 40a and 40b.
[0021]
The first motor 34 is attached to a stay 48 that is integrally formed from a plate-like first support member 46 via a first support block 44, and the guide 42 is located at a substantially central portion of the first support member 46. It is attached parallel to the axial direction of the shaft 36. The first support member 46 is made of an insulating material. This is to obtain good insulation between the high-frequency heating coil 22 and the first moving mechanism 24.
[0022]
The screw shaft 38 is provided with an unthreaded portion 39 at a substantially central portion thereof. On both sides of the unthreaded portion 39, a male screw 38a and a male screw 38b are formed in a reverse screw relationship. The slide block 40a is formed with a female screw corresponding to the male screw 38a, and the slide block 40b is formed with a female screw corresponding to the male screw 38b. Accordingly, the slide blocks 40a and 40b are moved toward or away from each other by the rotational operation of the screw shaft 38 under the sliding support of the guide 42.
[0023]
The heating conductor portions 22a and 22b are attached to the slide blocks 40a and 40b via an insulating member 50, respectively. Accordingly, the heating conductor portions 22a and 22b are moved toward or away from each other so as to have a predetermined gap corresponding to the type of the diameter of the intermediate product W together with the slide blocks 40a and 40b (in FIG. 1, arrows X direction reference).
[0024]
The second moving mechanism 26 includes a second motor 54, a shaft 56 extending from the second motor 54 and rotating together with the second motor 54, one end rotatably connected to the shaft 56, and the other end bearing. 58, a screw column 60a pivotally supported by 58, a belt 62 for synchronously transmitting the rotational operation to the other screw columns 60b, 60c and 60d by the rotational operation of the screw column 60a, and adjusting the tension of the belt 62 A tension adjusting unit 64. The screw columns 60b, 60c and 60d are pivotally supported by a bearing 58 in the same manner as the screw column 60a. These screw columns 60 a, 60 b, 60 c and 60 d are placed on the insulating plate 52 together with the bearings 58.
[0025]
The second motor 54 is attached to a gantry 70 that is integrally formed from a plate-like second support member 68 via a second support block 66.
[0026]
A ring 72 that is engaged with the belt 62 and rotates together with the screw columns 60a, 60b, 60c, and 60d is fixed to the screw columns 60a, 60b, 60c, and 60d. The first support member 46 is supported by these screw columns 60a, 60b, 60c and 60d so as to be movable up and down. That is, the first support member 46 is formed with female threads corresponding to male threads formed on the screw columns 60a, 60b, 60c and 60d, and these screw columns 60a, 60b, 60c and 60d are synchronously formed. By rotating, the first support member 46 is moved up and down along the shaft portion U of the intermediate product W (see the arrow Y direction in FIG. 1). Accordingly, the heating conductor portions 22a and 22b are moved together with the first support member 46 to a predetermined position with respect to the intermediate product W.
[0027]
The tension adjustment unit 64 includes an adjustment shaft 74 that is slidable with respect to the second support member 68, and a pulley 76 that is engaged with the belt 62 and is rotatably supported with respect to the adjustment shaft 74. Including. By moving the adjustment shaft 74 forward and backward, the belt 62 is adjusted so as not to cause slippage or the like with respect to the ring 72.
[0028]
The second support member 68 is engaged with unthreaded portions extending from the screw columns 60a, 60b, 60c and 60d, whereby the second support member 68 is engaged by the screw columns 60a, 60b, 60c and 60d. It is supported.
[0029]
Note that an opening 78 is provided at a substantially central portion of the second support member 68. This is for facilitating maintenance on the screw shaft 38, the slide blocks 40a and 40b, the guide 42 and the like described above.
[0030]
The workpiece conveyance mechanism 28 includes a conveyance conveyor 80 and a clamp 82 that is provided on the conveyance conveyor 80 and clamps the shaft portion U of the intermediate product W.
[0031]
The conveyor 80 moves in translation along the high-frequency heating coil 22 (see the arrow Z direction in FIG. 1).
[0032]
The clamp 82 sandwiches the intermediate product W, is translated along with the transport conveyor 80, and uniformly heats the intermediate product W while the intermediate product W travels through the high-frequency heating coil 22. Is rotated by a rotation driving means (not shown).
[0033]
The power supply unit 30 includes a control unit 86 including a high frequency power supply 84, a first electrical connection mechanism 88, and a second electrical connection mechanism 90. In FIG. 1, reference numerals 92 a, 92 b, and 92 c indicate conductors for electrically connecting the control unit 86, the first electrical connection mechanism 88, and the second electrical connection mechanism 90. Reference numeral 94 denotes a lead for electrically connecting the first electrical connection mechanism 88 and the heating conductor 22b, and the second electrical connection mechanism 90 and the heating conductor 22a, respectively.
[0034]
As a setting condition for heating the intermediate product W, the control unit 86 sets the current supplied from the high-frequency power source 84 or the applied voltage, and the heating conductor portion 22a by the operation of the first moving mechanism 24. The setting of the separation position of 22b and the setting of the vertical position of the first support member 46 by the operation of the second moving mechanism 26 are performed, and the setting values are stored and displayed. Then, input / output control of each related component is performed based on each setting condition.
[0035]
The first electrical connection mechanism 88 includes an advance / retreat driving means 96 such as an air cylinder, a rod 98 extending from the advance / retreat drive means, and an arm 100 extending from the advance / retreat drive means 96 and facing the rod 98. Have. The first electrical connection mechanism 88 performs connection or release operation of the conductor 92a and the conductor 102a, and the conductor 92b and the conductor 102b, respectively.
[0036]
That is, normally, the forward / backward drive means 96 is advanced, the rod 98 is energized, and the conductor 92a, the conductor 102a, and the conductor are interposed between the arm 100 and the auxiliary plate 104 and the insulating plate 106, respectively. 92b and the conductor 102b are connected. The conductors 102a and 102b are connected to the heating conductor portion 22a through a conducting wire 94.
[0037]
On the other hand, when the heating conductor portions 22a and 22b are moved closer to or away from each other by the first moving mechanism 24, the heating conductor portions 22a and 22b are moved up and down together with the first support member 46 by the second moving mechanism 26. At this time, the advancing / retreating drive means 96 is retracted, and the bias of the rod 98 is released, and the connection between the conductor 92a and the conductor 102a and between the conductor 92b and the conductor 102b is released. This is to avoid stress applied to the conductor 94 connected to the conductors 102a and 102b.
[0038]
The second electrical connection mechanism 90 is configured in the same manner as the first electrical connection mechanism 88. The same components are denoted by the same reference numerals, and differences in their operating states will be described.
[0039]
In the second electrical connection mechanism 90, the connection operation or the release operation of the conductor 92b and the conductor 102d and the conductor 92c and the conductor 102c are performed. Normally, the conductor 92b and the conductor 102d, and the conductor 92c and the conductor 102c are connected to each other. Note that the conductors 102c and 102d are connected to the heating conductor portion 22b through the conductive wire 94.
[0040]
On the other hand, when the heating conductor portions 22a and 22b move closer or apart, or move up and down, the connection between the conductor 92b and the conductor 102d and between the conductor 92c and the conductor 102c is released. This is to avoid stress applied to the conductive wire 94 connected to the conductors 102c and 102d.
[0041]
Note that the first electrical connection mechanism 88 and the second electrical connection mechanism 90 are synchronized with the operations of the first moving mechanism 24 and the second moving mechanism 26, and therefore based on a control command from the control unit 86. It is desirable to operate.
[0042]
The high-frequency heating device 20 according to the embodiment of the present invention is basically configured as described above. Next, FIGS. 2 and 3 will be described with respect to the operation and effects of the high-frequency heating device 20. It demonstrates in relation to the high frequency heating method, referring. In the drawings referred to below, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0043]
Here, the intermediate product W of the engine valve until it is supplied to the high-frequency heating device 20 will be described slightly with reference to FIG.
[0044]
First, a cut product 110 cut from a cylindrical raw material to a predetermined length is obtained. Next, one end of the cut product 110 is formed by an upset forging method, and an intermediate product W including a tip 112 formed in a substantially spherical shape is obtained. The leading end 112 of the intermediate product W is formed by a hot forging method, and a valve original product 114 including the valve portion V formed in a substantially umbrella shape is obtained.
[0045]
When the tip 112 of the intermediate product W is formed by this hot forging method, the intermediate product W is supplied to the high-frequency heating device 20 (see FIG. 1) and preheated.
[0046]
In the control unit 86, the conditions set and stored for each type of the intermediate product W are read out. In FIG. 2, the intermediate product W <b> 1 has a maximum dimension that is heat-treated in the high-frequency heating device 20.
[0047]
In this case, the first motor 34 is rotated in a predetermined direction according to the work start command, and the screw shaft 38 is rotated together with the shaft 36. As a result, under the sliding support of the guide 42, the heating conductors 22a and 22b are moved closer to (or moved away from) in the direction of the arrow X together with the slide blocks 40a and 40b, and are positioned at predetermined positions. This predetermined position is set so as to coincide with the gap A shown in FIG. 5A with respect to the diameter Wa of the front end portion 112 of the intermediate product W1. That is, the gap A is an optimum gap that is positioned in terms of production efficiency or use efficiency of electric energy when the front end portion 112 of the intermediate product W1 is heat-treated.
[0048]
Further, the second motor 54 is rotated in a predetermined direction, and the screw column 60 a is rotated together with the shaft 56. Thereby, under the action of the belt 62, the screw columns 60b, 60c and 60d are rotated in synchronization with the screw column 60a. Then, the heating conductor portions 22a and 22b together with the first support member 46 are moved up and down in the direction of the arrow Y, and are positioned at predetermined positions. Similar to the gap A described above, this vertical movement position is an optimal position that is positioned in terms of production efficiency or use efficiency of electric energy when the front end portion 112 of the intermediate product W1 is heat-treated.
[0049]
At this time, in the first electrical connection mechanism 88 and the second electrical connection mechanism 90, the advance / retreat driving means 96 is retracted, and the urging force of the rod 98 is released, so that the conductor 92a, the conductor 102a, and the conductor 92b are released. The conductors 102b, the conductors 92b and 102d, and the conductors 92c and 102c are disconnected. Then, when the positioning of the heating conductor portions 22a and 22b is completed, the respective advancing / retreating drive means 96 are moved forward, and the rods 98 are energized to respectively conduct the conductor 92a and the conductor 102a, the conductor 92b and the conductor 102b, The conductor 92b and the conductor 102d, and the conductor 92c and the conductor 102c are connected to each other (see FIG. 1).
[0050]
The intermediate product W <b> 1 supplied to the conveyor 80 is supported on the shaft U side by a clamp 82. Next, based on a command signal from the control unit 86, the heating conductor portion 22 a is connected to the conductors 92 a, 92 c and 92 b, the first electrical connection mechanism 88 and the second electrical connection mechanism 90, and the conducting wire 94 from the high frequency power supply 84. And 22b are supplied with a predetermined current (or a predetermined voltage is applied).
[0051]
Here, the conveyor 80 advances in the direction of the arrow Z, and the intermediate product W1 is transported along the heating conductor portions 22a and 22b. During this time, the intermediate product W1 is conveyed by the heating conductor portions 22a and 22b. The tip 112 is heated. At this time, the intermediate product W1 rotates together with the clamp 82, whereby the tip 112 is uniformly heated. The traveling speed of the conveyor 80 is set in consideration of the production tact time of the intermediate product W (W1) and the length of the heating conductors 22a and 22b with respect to the traveling direction of the intermediate product W (W1). It is.
[0052]
In this way, the intermediate product W1 sequentially supplied to the transport conveyor 80 is continuously heat-treated, and in the state where the shaft portion U side is supported by the clamp 82 on the transport conveyor 80, the next step is hot forging. It is conveyed to the process.
[0053]
When the intermediate product W1 is changed to, for example, the intermediate product W2 shown in FIG. 3, the supply of the predetermined current supplied from the high-frequency power source 84 is temporarily stopped (or a predetermined voltage). Pause application). Next, in the first electrical connection mechanism 88 and the second electrical connection mechanism 90, the conductor 92a and the conductor 102a, the conductor 92b and the conductor 102b, the conductor 92b and the conductor 102d, and the conductor 92c and the conductor 102c are connected. Release each one.
[0054]
Here, the control unit 86 reads the conditions set and stored for the intermediate product W2. In this case, the intermediate product W2 has a diameter Wb that is smaller than the diameter Wa of the tip 112 of the intermediate product W1.
[0055]
As in the case of the intermediate product W1 described above, the heating conductors 22a and 22b are moved closer (or moved apart) in the direction of the arrow X, and coincide with the gap A with respect to the diameter Wb of the front end 112 of the intermediate product W2. To be positioned. Further, the heating conductor portions 22a and 22b are moved up and down in the direction of the arrow Y together with the first support member 46, and are positioned at an optimum position with respect to the front end portion 112 of the intermediate product W2.
[0056]
Next, in the first electrical connection mechanism 88 and the second electrical connection mechanism 90, the conductor 92a and the conductor 102a, the conductor 92b and the conductor 102b, the conductor 92b and the conductor 102d, and the conductor 92c and the conductor 102c Each is connected. Then, based on a command signal from the control unit 86, a predetermined current is supplied (or a predetermined voltage is applied) from the high frequency power supply 84 to the heating conductor portions 22a and 22b. In this case, the predetermined current (or predetermined voltage) may be set to the same setting as that of the intermediate product W1 described above.
[0057]
In this way, the intermediate product W2 sequentially supplied to the conveyor 80 is continuously heated, and the shaft U side is supported by the clamp 82 on the conveyor 80 in the next step. It is conveyed to a certain hot forging process.
[0058]
In the present embodiment, the shaft portion U of the intermediate product W (W1, W2), which is a workpiece, has been described as having a single diameter, but for example, when the diameter of the shaft U is different. Of course, the clamp 82 may be replaced with a clamp corresponding to each of the diameters. Alternatively, a plurality of types of clamps corresponding to the types of the diameter dimensions are provided on the transport conveyor 80 in advance, and the insulating plate 52 is mounted together with the high-frequency heating coil 22, the first moving mechanism 24, and the second moving mechanism 26. Of course, it is possible to place the slide table on the slide table or the like and slide the slide table or the like with respect to the conveyor 80 to correspond to the type of the diameter when changing the type according to the diameter. Absent.
[0059]
As described above, according to the high-frequency heating device 20 according to the embodiment of the present invention, when the plurality of intermediate products W, W1, and W2 having different dimensions are heat-treated, the heating conductor portions 22a and 22b are used. The intermediate products W, W1, or W2 can be made to correspond to the dimensions, respectively, and it is not necessary to adjust the current supplied from the high frequency power supply 84 or the applied voltage each time. The productivity of W2 can be improved.
[0060]
In addition, it becomes possible to position the heating conductor portions 22a and 22b at the optimum position and at the optimum position for each of the plurality of intermediate products W, W1 or W2 having different dimensions. Since the loss of electric energy supplied from 84 can be extremely reduced, the utilization efficiency of electric energy can be improved.
[0061]
Further, by operating the first moving mechanism 24 and / or the second moving mechanism 26, the positions of the heating conductor portions 22a and 22b set for each type of the intermediate products W, W1 and W2 are determined. Therefore, when changing the types of the intermediate products W, W1, and W2, the position setting of the heating conductor portions 22a and 22b can be automated, and the production efficiency of the intermediate products W, W1, and W2 can be increased. It becomes possible to raise at once.
[0062]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0063]
That is, when a plurality of workpieces having different dimensions are heat-treated, it becomes possible to respond by moving the pair of high-frequency heating coils closer or away from each other. Therefore, the productivity for the workpiece can be improved.
[0064]
In addition, it becomes possible to position a pair of high-frequency heating coils with an optimal gap for each of a plurality of workpieces having different dimensions, and the loss of electrical energy supplied from a high-frequency power source can be extremely reduced. Therefore, the utilization efficiency of electric energy can be improved.
[0065]
Further, by operating the first moving mechanism and / or the second moving mechanism, it is possible to position the pair of high-frequency heating coils set for each type of the workpiece. When changing the type, the setting of the apparatus can be automated, and the production efficiency of the workpiece can be increased at once.
[Brief description of the drawings]
FIG. 1 is an explanatory perspective view of a high-frequency heating device according to an embodiment of the present invention.
FIG. 2 is an explanatory side view showing a positional relationship between a heating conductor portion and an intermediate product (W1) of an engine valve in the high-frequency heating device according to the present embodiment.
FIG. 3 is an explanatory side view showing a positional relationship between a heating conductor portion and an intermediate product (W2) of an engine valve in the high-frequency heating device according to the present embodiment.
FIG. 4 is an explanatory diagram of an intermediate product of the engine valve according to the present embodiment.
FIG. 5A is an explanatory side view showing a positional relationship between the high-frequency heating coil and the intermediate product (3a) of the engine valve in the high-frequency heating device according to the prior art. FIG. 5B is an explanatory side view showing the positional relationship between the high-frequency heating coil and the intermediate product (3b) of the engine valve in the high-frequency heating device according to the prior art.
[Explanation of symbols]
20 ... high frequency heating device 22 ... high frequency heating coil
22a, 22b ... heating conductor portion 24 ... first moving mechanism
26 ... Second moving mechanism 34 ... First motor
38 ... Screw shaft 40a, 40b ... Slide block
54 ... Second motor 60a-60d ... Screw pillar
62 ... Belt W, W1, W2 ... Intermediate product (workpiece)

Claims (5)

A high-frequency heating method for heat-treating a plurality of workpieces having different dimensions,
A pair of high frequency heating coils;
A first moving mechanism for moving the pair of high-frequency heating coils toward or away from each other along one direction of the workpiece;
A second moving mechanism for moving the pair of high-frequency heating coils along another direction intersecting the one direction of the workpiece;
Have
Activating the first moving mechanism and positioning the pair of high-frequency heating coils with a predetermined gap with respect to a dimension in one direction of the workpiece;
A step of positioning the second moving mechanism is operated, said pair of high-frequency heating coil to a predetermined position with respect to the other dimension of the workpiece,
Energizing the pair of high-frequency heating coils positioned by the first and second moving mechanisms to high-frequency heat the workpiece;
A high frequency heating method comprising: A high-frequency heating apparatus that heat-treats a plurality of workpieces having different dimensions,
A pair of high frequency heating coils;
A first moving mechanism for moving the pair of high-frequency heating coils toward or away from each other along one direction of the workpiece;
A second moving mechanism for moving the pair of high-frequency heating coils along another direction intersecting the one direction of the workpiece;
A high frequency heating apparatus comprising: The high-frequency heating device according to claim 2,
The first moving mechanism includes first driving means and first transmission means for transmitting the driving force of the first driving means,
The second moving mechanism includes second driving means and second transmission means for transmitting the driving force of the second driving means,
The first and second driving means are respectively attached to a first support member and a second support member supported by a plurality of columnar members,
Energizing the first transmission means by the driving force of the first driving means to move the pair of high-frequency heating coils toward or away from each other;
The second transmission means is urged by the driving force of the second driving means, and the pair of high-frequency heating coils are moved along the plurality of columnar members together with the first support member. High frequency heating device. The high-frequency heating device according to claim 2,
The pair of high-frequency heating coils are long high-frequency heating coils that are divided and arranged to face each other in order to heat the plurality of workpieces from both sides. In the high frequency heating device according to claim 2 or 4,
The high-frequency heating device is characterized in that the electrical circuit and the cooling fluid circuit are connected to the pair of high-frequency heating coils, respectively.

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