JP2011127159A - High frequency induction heating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high frequency induction heating apparatus in which hardening and annealing of a workpiece can be almost continuously performed with one set of the heating apparatus and with which the hardening and the annealing having a prescribed condition can be surely performed and thus, the workpiece with good hardening and annealing quality can be easily and stably be obtained. <P>SOLUTION: The high frequency induction heating apparatus is provided with a heating coil, a high frequency power source, a cooler, a mark imparting tool and a controller. The controller supplies the high frequency current for hardening from the high frequency power source to the heating coil and hardens the hardening portion of the workpiece, and after hardening, the controller supplies the high frequency current for annealing from the high frequency power source to the heating coil and anneals the annealing portion of the workpiece, and after at least annealing of the workpiece, the mark imparting tool is operated to impart a prescribed mark to the non-hardening/non-annealing portion of the workpiece. The high frequency power source is provided with a first frequency power source part capable of supplying the high frequency electric current for hardening to the heating coil, and a second electric source part capable of supplying the high frequency electric current for annealing to the heating coil. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a high-frequency induction heating apparatus that can perform quenching and annealing of various workpieces by high-frequency induction heating substantially continuously with a single heating apparatus.

  In general, when a predetermined part of the outer peripheral surface of a shaft work such as a gear shaft is quenched or annealed, an eddy current is induced in the predetermined part by a high-frequency current having a predetermined frequency to induce induction heating. A high frequency induction heating device is used. Conventionally, such a high frequency induction heating apparatus has a heating coil, a cooling means, a high frequency power source capable of generating a high frequency current having a predetermined frequency suitable for quenching or annealing, and the like.

  When quenching, a high-frequency power source capable of generating a high-frequency current having a frequency suitable for quenching is supplied to the heating coil by supplying a high-frequency current for quenching and induction heating, and the cooling means is cooled. The workpiece is quenched by rapidly cooling the heated part with water. In addition, when annealing, a work is performed by supplying induction high-frequency current to the heating coil from a heating device equipped with a high-frequency power source capable of generating a high-frequency current having a frequency suitable for annealing. Is annealed. As this type of high-frequency induction heating device, for example, Patent Document 1 is disclosed.

JP 2006-34421 A

  However, in such a high-frequency induction heating apparatus, the conditions for quenching and annealing of the workpiece are different, and each is performed using a heating apparatus having a high-frequency power source with a different frequency. When performing subsequent annealing, it is necessary to operate the heating device for annealing after quenching with the heating device for quenching, and it is difficult to quench and anneal the workpiece substantially continuously. The work efficiency is inferior.

  In addition, since it is necessary to take out the workpiece quenched by the heating device for quenching from the heating device and set it in the heating device for annealing installed at another position, When moving between heating devices, etc., workpieces that are poorly quenched or unquenched may be supplied to the heating device for annealing and annealed. It is difficult to reliably perform annealing, and it is difficult to easily and stably obtain good quenching and annealing quality for a workpiece.

  The present invention has been made in view of such circumstances. The purpose of the present invention is to perform quenching and annealing of a workpiece substantially continuously with a single heating device, and quenching and annealing under predetermined conditions. It is an object of the present invention to provide a high-frequency induction heating apparatus capable of reliably and reliably obtaining workpieces of good quenching and annealing quality.

  In order to achieve such an object, the invention described in claim 1 of the present invention includes a heating coil disposed at a quenching part and an annealing part of a work supported by a supporting means, and a high frequency having a predetermined frequency in the heating coil. A high-frequency power source for supplying a current; a cooling unit capable of cooling the workpiece; a mark applying unit that applies a predetermined mark to the workpiece; and a control unit that controls the mark. The control unit includes the high-frequency power source. A high frequency current for quenching is supplied from a power source to the heating coil to quench the quenching portion of the workpiece, and after quenching, a high frequency current for annealing is supplied from the high frequency power source to the heating coil to anneal the workpiece. The part is annealed, and at least after the work is annealed, the mark applying means is operated to apply a predetermined mark to the work.

  According to a second aspect of the present invention, there is provided a first power supply unit capable of supplying a high frequency current for quenching to the heating coil, and a first power source capable of supplying a high frequency current for annealing to the heating coil. It has 2 power supply parts. Furthermore, the invention described in claim 3 is characterized in that the mark applying means is a paint application device for applying a predetermined color of paint to a workpiece or a marking device for applying a predetermined marking to the workpiece. According to a fourth aspect of the present invention, there is provided mark detection means capable of detecting the mark applied by the mark application means, and the control means is a non-defective product based on the mark detected by the mark detection means. Or a defective product.

  According to the invention described in claim 1 of the present invention, the workpiece is quenched by the control of the control means, and the workpiece is annealed in a substantially continuous state, and after the workpiece is annealed, the mark applying means is operated to activate the workpiece. In order to give a predetermined mark to the workpiece, quenching and annealing of the workpiece can be performed in one continuous work cycle with a single device, and the efficiency of quenching and annealing can be improved. The marks after annealing can prevent quenching and annealing and supply to post-processes such as defective products, and can easily and stably obtain a workpiece with good quenching and annealing quality.

  According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the high frequency power source can supply the quenching high frequency current to the heating coil, and the annealing power source. Since it has the 2nd power supply part which can supply a high frequency current to a heating coil, the high frequency current of a predetermined output is reliably supplied to a heating coil with the predetermined frequency for hardening or annealing from the 1st power supply part and the 2nd power supply part. be able to.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the mark imparting means is a paint application device for applying a predetermined color paint to the work, or a predetermined work is applied to the work. Since it is a marking device that performs marking, a mark can be reliably applied to a predetermined part of a workpiece by paint or stamping, and a workpiece with better quenching and annealing quality can be obtained easily and stably.

  Furthermore, according to the invention described in claim 4, in addition to the effects of the invention described in claims 1 to 3, the control means determines whether the work is a good product or a defective product based on the mark detected by the mark detection device. Therefore, the mark detection means can detect the non-defective product and the defective product with high accuracy, and reliably prevent the defective product from being supplied to the subsequent process.

Schematic configuration diagram of a high-frequency induction heating apparatus according to the present invention Schematic configuration diagram of the high-frequency power supply Explanatory drawing of the mark giving means Explanatory drawing of other mark giving means Process diagram of the quench annealing process Flow chart of the marking process

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
1-6 has shown one Embodiment of the high frequency induction heating apparatus concerning this invention. As shown in FIG. 1, the high frequency induction heating apparatus 1 includes an upper support member 2 and a lower support as support means for supporting upper and lower ends of a shaft-shaped work W (work W) made of, for example, a gear shaft or a turbine shaft. The workpiece 3, the workpiece clamping device 4 that clamps the workpiece W by moving (operating) the upper support member 2 in a predetermined direction, the workpiece rotating device 5 that rotates the lower support member 3 in a predetermined direction, and quenching annealing of the workpiece W The heating coil 6 is provided on the outer peripheral side of the soldering portion Wa.

  The high frequency induction heating device 1 constitutes a cooling means together with a coil moving device 7 for moving the heating coil 6 along the portion Wa after quenching and annealing, and a cooling jacket 8 provided integrally with the heating coil 6. A cooling water supply device 9 for supplying cooling water to the heating coil 6, a high-frequency power supply device 10 (high-frequency power supply) for supplying high-frequency currents of two kinds of predetermined frequencies to the heating coil 6, and non-quenching annealing of the workpiece W A mark applying device 11 (mark applying device) for applying a mark 12 to be described later to the part Wb, a mark detecting device 13 (mark detecting device) capable of detecting the mark 12 applied to the workpiece W, and each of these devices A control device 14 (control means) for controlling is provided.

  The control device 14 includes a CPU 14a, a ROM 14b, a RAM 14c, a non-defective indicator lamp 15, a defective indicator lamp 16, and the like, and the input side thereof can detect the lower limit position and the upper limit position of the heating coil 6. The workpiece clamping device 4, the workpiece rotating device 5, the heating coil 6, the coil moving device 7, the cooling water supply device 9, the high frequency power supply device 10, the mark applying device 11, and the like are connected to the output side. Has been. The control device 14 is connected to the mark detection device 13 and an input device (not shown) capable of inputting conditions for quenching and annealing described later.

  As shown in FIG. 2A, the high-frequency power supply device 10 includes a first inverter 17a as a first power supply unit capable of generating a high-frequency current for quenching, and a second inverter capable of generating a high-frequency current for annealing. It has the 2nd inverter 17b as a power supply part, the switch 18 etc. which were connected to the output terminal of both these inverters 17a and 17b. The first inverter 17a and the second inverter 17b are configured by an inverter circuit in which semiconductor switching elements such as transistors, MOSFETs, IGBTs, and the like are connected in a full bridge, for example. The input side is connected to the control device 14, and the output side is a predetermined form. Are connected to one input terminal of each switch 18.

  The output terminal of the switch 18 is connected to the heating coil 6 through a conductor such as a copper plate or a cable (not shown). In the high-frequency power supply device 10, the first inverter 17 a and the second inverter 17 b are set to the operating state by the control signal from the control device 14, and the switch 18 is set to the predetermined side by the control signal from the control device 14. By switching, the high frequency current by the first inverter 17a or the high frequency current by the second inverter 17b is supplied to the heating coil 6, that is, the heating coil 6 is quenched by the first inverter 17a or by the second inverter 17b. A high frequency current for annealing is supplied.

  The high-frequency power supply device 10 is not limited to this configuration, and can be configured as shown in FIG. 2B, for example. That is, the high-frequency power supply device 10 includes one inverter circuit 20 based on a full bridge connection of semiconductor switching elements, a first oscillation circuit 21a and a second oscillation circuit 21b that operate (turn on / off) the inverter circuit 20, A switch 22 and the like connected between the oscillation circuits 21a and 21b and the inverter circuit 20 are included. In this example, the inverter circuit 20 and the first oscillation circuit 21a form a first power supply unit, and the inverter circuit 20 and the second oscillation circuit 21b form a second power supply unit.

  Then, the inverter circuit 20 and both the oscillation circuits 21a and 21b are set to the operating state by the control signal of the control device 14, and the switch 22 is switched to a predetermined side by the control signal of the control device 14, thereby oscillating the inverter circuit 20. The frequency is set to a predetermined value. Thereby, the high-frequency current supplied from the output terminal of the inverter circuit 20 to the heating coil 6 is set to the high-frequency current for quenching by the first oscillation circuit 21a or the high-frequency current for annealing by the second oscillation circuit 21b. It will be.

  In the case of this example, the connection of the switch 22 is not limited to between the two oscillation circuits 21a and 21b and the inverter circuit 20, but as shown by the two-dot chain line in FIG. 2B, both the oscillation circuits 21a and 21b. It is also possible to connect to the input side. As the switch 22 of this example, since a high current does not flow through the switch 22 itself, for example, a semiconductor switch having a good response (switchability) can be used. As described above, the high-frequency power supply device 10 only needs to be able to supply a high-frequency current for quenching and a high-frequency current for annealing to the heating coil 6. For example, the high-frequency power supply device 10 includes one inverter circuit or oscillation circuit and has an oscillation frequency thereof. It is possible to adopt an appropriate circuit configuration such as a configuration in which high-frequency currents of two types of frequencies are generated by switching the characteristic values of the electrical components that determine the above.

  As shown in FIG. 1, the heating coil 6 is formed in an annular shape (or a horseshoe shape), for example, in a plan view, and disposed with a predetermined gap on the outer peripheral surface of the workpiece W that is quenched and annealed. At the same time, the coil moving device 7 is disposed so as to be movable in the axial direction (in the direction of arrow A in FIG. 1) along the outer peripheral surface of the quenching and annealing portion Wa. Further, for example, the annular cooling jacket 8 having a cooling water flow passage formed therein is integrally provided on the lower surface (or upper surface) of the heating coil 6, and a large number of the cooling jacket 8 has an inner peripheral surface. The cooling water injection hole (not shown) is formed. Further, the cooling water flow path of the cooling jacket 8 is connected to the cooling water supply device 9 via an appropriate hose.

  The heating coil 6 configured in this manner is electrically connected at both ends to the high frequency power supply device 10, and when the power supply device 10 operates, a high frequency current of a predetermined frequency is supplied and the cooling water supply Cooling water is circulated and supplied from the device 9 into the cooling water flow path of the cooling jacket 8 via a hose, and this cooling water is jetted toward the workpiece W from the cooling water jet hole. In addition, the heating coil 6 is moved up and down along the guide by the rotation of the motor of the coil moving device 7 in response to a control signal from the control device 14, so that a predetermined range on the outer peripheral side of the workpiece W (the quenching annealing portion Wa) The range is moved up and down.

  As shown in FIG. 3, the mark applying device 11 includes a paint tank 23a provided with a nozzle 23b at the tip and containing paint of a predetermined color, and a drive unit 23c that moves the paint tank 23a as indicated by an arrow b in the figure. It is comprised by the coating material coating device 23 which consists of. Then, when the drive unit 23c is operated by the control signal of the control device 14, the paint tank 23a moves in the workpiece W direction, and the paint is ejected from the nozzle 23b as shown by the arrow C in FIG. As shown in FIG. 3B, the workpiece 12 is applied as a mark 12 at a predetermined position of the non-quenched and annealed portion Wb of the workpiece W.

  In addition, as the mark provision apparatus 11, it is not limited to the coating material coating apparatus 23 shown in FIG. 3, For example, the marking apparatus 24 shown in FIG. 4 can also be used. The marking device 24 includes a laser generator 24a capable of irradiating a laser, a firing nozzle 24b provided at the tip of the laser generator 24a, a drive unit 24c, and the like. As shown in FIG. 4 (a), a laser is emitted from the laser generator 24a through the emission nozzle 24b toward the work W as indicated by an arrow D. For example, a circular mark made of a groove (concave portion) is formed on the workpiece W by this laser, and a mark 12 as shown in FIG. 4B is provided. As described above, the mark applying device 11 is a mark 12 that can be identified visually by a mark detection device 13 or an operator, which will be described later, by a color, unevenness, or a stickable sticker on the non-quenched and annealed portion Wb of the workpiece W. Any suitable applicator capable of imparting can be used.

  The mark detection device 13 is composed of, for example, an imaging camera, detects the mark 12 applied to the non-quenching annealed portion Wb of the workpiece W, and outputs a detection signal to the control device 14. . The mark detection device 13 is not always necessary, and is suitable for automatically recognizing the mark 12 applied by the workpiece applying device 11 and supplying (supplying) it to a polishing or distortion removing process, which is a subsequent process. However, for example, in the case of an operation in which the operator visually confirms the mark 12 and flows it to the subsequent process, it can be omitted.

  Next, an example of the work of quenching and annealing the workpiece W using the high frequency induction heating apparatus 1 will be described based on the process diagram of FIG. 5 and the flowchart of FIG. In the following description, it is assumed that the high-frequency power supply device 10 has the configuration shown in FIG. First, as shown in FIG. 1, the workpiece W is formed in a predetermined outer shape, and is quenched and annealed at a predetermined length, and non-quenched annealed below the quench annealed portion Wa. It has a portion Wb and upper and lower support portions Wc, Wd and the like.

  Then, the heating coil 6 is set at the initial position which is the lower limit position, and the workpiece W is inserted into the heating coil 6 from above and the lower support member 3 is supported by the lower support member 3. The upper support member 2 is supported by the upper support member 2, and in this state, the workpiece clamping device 4 is operated by a control signal from the control device 14 to clamp the workpiece W (K01). When the workpiece W is clamped, the switch 18 of the high frequency power supply device 10 is switched to the first inverter 17a side which is the quenching side by the control signal of the control device 14, and the high frequency power supply device 10 is set to the quenching side (K02), A high-frequency current is supplied to the heating coil 6 via the first inverter 17a and the switch 18, and the quenching operation is started (K03).

  At this time, the frequency of the high-frequency current used for quenching is set to 100 to 200 KHz, for example. In the quenching operation, the work rotating device 5 is operated by the control signal of the control device 14 to rotate the work W, while the high frequency power supply device 10 is operated to quench and anneal by the high frequency current, and the part Wa is induction heated to a predetermined temperature. The cooling water supply device 9 is operated and cooling water is sprayed from the cooling water injection holes of the cooling jacket 8 to the heating portion to be rapidly cooled. In addition, this quenching operation is performed substantially continuously by moving the heating coil 6 from the lower part of the part Wa to the upper part by quenching and annealing the work W by the operation of the coil moving device 7 according to the control signal of the control device 14. Done.

  And if the heating coil 6 raises and reaches an upper limit position, the heating coil 6 will be stopped by the control signal of the control apparatus 14, and a hardening operation will be complete | finished by this (K04). When the quenching operation is completed, the coil moving device 7 is actuated by the control signal of the control device 14, and the heating coil 6 is lowered to the initial position (lower limit position) and stopped at the position. In this state, the switch 18 of the high frequency power supply device 10 is switched to the second inverter 17b side, which is the annealing side, by the control signal of the control device 14, and the high frequency power supply device 10 is set to the annealing side (K05). Then, the annealing work is started (K06).

  The high-frequency current used for this annealing is set to, for example, about 30 KHz, the frequency of which is lower than that of quenching. This annealing operation is performed by quenching and annealing with the high-frequency current by operating the high-frequency power supply device 10 while rotating the workpiece W. This is performed by induction heating the part Wa to a predetermined temperature. Further, the heating coil 6 is quenched and annealed by the operation of the coil moving device 7 and moved upwardly from the lower part to the upper part of the portion Wa, so that the heating coil 6 is performed substantially continuously. During the annealing operation, naturally, cooling by jetting of cooling water is not necessary, and the cooling water supply device 9 is inactive.

  When the heating coil 6 rises again and reaches the upper limit position, the heating coil 6 is stopped by a control signal from the control device 14, thereby annealing and finishing the work (K07). When the annealing operation is completed, the coil moving device 7 is actuated by the control signal of the control device 14, the heating coil 6 is lowered to the initial position and stopped at that position, and the mark application is performed by the control signal of the control device 14. The apparatus 11 operates to mark the workpiece W (K08).

  This marking is performed under the control of the control device 14 as shown in FIG. That is, when the marking program is started (S081), it is determined whether or not the annealing is finished (S082). This determination S082 is repeated until “YES”, and the process K07 of FIG. If “YES”, it is determined whether or not the quenching and annealing conditions are normal (S083). These conditions are the current value and frequency output from the high-frequency power supply apparatus 10 during the quenching and annealing operations in steps K03 and K04 and steps K06 and K07 in FIG. In step S083, it is determined whether or not the condition matches the condition set by the input device (or is within a preset range).

  If “YES” in the determination S083, that is, if the conditions at the time of quenching or annealing match the preset conditions, the mark applying device 11 is operated by the control signal of the control device 14 (S084). A mark 12 is applied to the workpiece W, that is, marked. When the workpiece W is marked, the mark detection device 13 is operated by a control signal from the control device 14 (S085), and the signal is input to the control device 14. When the signal related to the mark 12 is input from the mark detection device 13, the control device 14 determines whether or not the marking is normal (S 086). If “YES” in this determination S086, that is, the detection signal of the input mark 12 coincides with a preset mark, the detected mark 12 has a predetermined color, or the shape of the detected inscription is If the shape is a predetermined shape, the workpiece W is determined to be non-defective (S087), and the non-defective indicator lamp 15 of the control device 14 is turned on, for example, and stored in a non-defective box.

  On the other hand, if “NO” in the determination S 086, that is, if the input detection signal of the mark 12 does not match a preset mark and the color and the stamp of the mark 12 cannot be detected normally, the workpiece W is changed. It is determined as a defective product (S088), for example, the defective product indicator lamp 16 of the control device 14 is turned on and stored in a defective product box. If “NO” in the determination S083, that is, if the conditions of quenching or annealing are not normal, the process proceeds to step S088, where a defective product is determined, and the series of programs ends (S089). That is, only the workpiece W to which quenching and annealing are normally performed under a predetermined condition and the predetermined mark 12 is given is determined as a non-defective product by the control device 14.

  When the marking in step K08 of FIG. 5 is performed in this way, the workpiece clamping device 4 is operated by the control signal of the control device 14 to unclamp the workpiece W (K09), and the upper and lower support members 2, 3 are operated. By taking out the workpiece W from the workpiece, the quenching and annealing of the workpiece W is completed. Thereby, the hardening and annealing work of the workpiece W is performed in a substantially continuous state using one high-frequency induction heating device 1 within one work cycle. In the above quenching and annealing work, the heating coil 6 was lowered and set to the initial position during the annealing work, that is, quenching and annealing were performed by the raising operation of the heating coil 6. However, the work may be started from the upper limit position of the heating coil 6 and terminated when the heating coil 6 is lowered and stopped.

  Thus, according to the high frequency induction heating device 1, the control device 14 controls the first power supply unit of the high frequency power supply device 10 and the cooling water supply device 9 to quench the quenching and annealing portion Wa of the work W, In order to quench the quenching and annealing part Wa by controlling the second power supply unit of the power supply device 10 in a substantially continuous state for this quenching, one work in which quenching and annealing of the workpiece W are substantially continuously performed by one apparatus. It can be performed within a cycle, and the efficiency of the quenching and annealing work can be improved.

  Moreover, since the high frequency power supply device 10 has two power supply units for quenching and annealing, and the single heating device 1 can perform quenching and annealing in a substantially continuous state, quenching from each power supply unit Alternatively, a dedicated high-frequency current for annealing can be reliably supplied to the heating coil 6, and the quenching quality itself and the annealing quality itself can be accurately performed. Moreover, the time from the end of quenching to the start of quenching can be shortened as much as possible, and deterioration in the quality of the quenching site before the start of annealing can be suppressed.

  Further, since the heating coil 6 is disposed so as to be movable along the quenching and annealing portion Wa and the cooling jacket 8 is integrally provided on the heating coil 6, for example, an axial workpiece W is provided. Can be performed while moving the heating coil 6 along the quenching annealing portion Wa of a predetermined length and rotating the workpiece W, further improving the efficiency of the quenching and annealing operation of the workpiece W, A uniform heating state can be obtained in the entire outer periphery of the quench annealing part. Accordingly, it is possible to easily and stably obtain a workpiece W having good quenching and annealing quality.

  In addition, since the mark 12 is applied to the workpiece W by operating the mark applying device 11 after the workpiece W is annealed, it is possible to clearly recognize that the workpiece W is a product obtained by quenching and annealing with the mark 12. In post-process work such as polishing and distortion removal, it is only necessary to work on products with this mark. As a result, it is possible to stably and easily obtain a work W of good quenching and annealing quality. In particular, since the control device 14 determines whether the workpiece W is a non-defective product or a defective product based on the mark 12 detected by the mark detection device 13, the control device 14 mechanically determines a non-defective product or a defective product. Therefore, it is possible to reliably prevent the defective product from being mixed into a non-defective product and being supplied to the subsequent process of the defective product.

  Further, as the mark applying device 11, a coating material application device 23 that applies a predetermined color coating material to the workpiece W or a marking device 24 that applies a predetermined marking to the workpiece W is used. Can be reliably applied to the non-quenched annealed portion Wb, the detection accuracy by the mark detection device 13 can be increased, and the automatic determination accuracy of non-defective and defective products of the workpiece W by the control device 14 can be increased. Recognition can be raised and the workpiece | work W which has much better quenching and annealing quality can be obtained easily and stably.

  Further, the high frequency power supply device 101 includes a first inverter 17a, a second inverter 17b, a switch 18 and the like, and the control device 14 controls the switch 18 to change the heating coil 6 from the first inverter 17a or the second inverter 17b. When configured to supply a high-frequency current having a predetermined frequency, the high-frequency current for quenching and the high-frequency current for annealing can be reliably supplied to the heating coil 6. The high frequency power supply device 10 includes an inverter circuit 20, a first oscillation circuit 21 a, a second oscillation circuit 21 b, and the like, and operates the first oscillation circuit 21 a or the second oscillation circuit 21 b under the control of the control device 14. If the circuit 20 is configured to supply a high-frequency current of a predetermined frequency to the heating coil 6, the number of inverter circuits of the high-frequency power supply device 10 can be reduced, the configuration of the switch 22 and the like can be simplified, and the power supply device 10 can be simplified. It can be formed at low cost.

  In the above-described embodiment, after the quenching and annealing are finished, the mark applying device 13 is operated to mark the workpiece W supplied to the subsequent process. For example, as shown by a two-dot chain line in FIG. The dedicated marking (K10) may be performed, and annealing may be performed after the annealing, and the dedicated marking (K08) may be performed. In this way, the hardened state and the annealed state of the workpiece W are individually determined. Etc. becomes possible.

  Moreover, in the said embodiment, although the heating coil 6 performed quenching annealing of the workpiece | work W and moving it up and down along the site | part Wa, this invention is not limited to this structure, The quenching annealing site | part of the workpiece | work W Depending on the length of Wa or the like, the heating coil 6 having a shape corresponding to the portion Wa is fixedly disposed at a predetermined position, and the heating coil 6 performs quenching and annealing in a substantially continuous state within one cycle. You can also. Furthermore, the shape of the heating coil 6 and the configuration of the control device 14 in the above embodiment are merely examples, and appropriate configurations can be employed without departing from the spirit of the present invention.

  The present invention is not limited to shaft-shaped workpieces such as gear shafts and turbine shafts, but can be used for all workpieces having a substantially cylindrical shape or a substantially prismatic shape that require quenching and annealing.

  DESCRIPTION OF SYMBOLS 1 ... High frequency induction heating apparatus, 2 ... Upper support member, 3 ... Lower support member, 4 ... Work clamp apparatus, 5 ... Work rotating apparatus, 6 ... Heating coil, 7. ..Coil moving device, 8 ... cooling jacket, 9 ... cooling water supply device, 10 ... high frequency power supply device, 11 ... mark applying device, 12 ... mark, 13 ... mark detection Device, 14 ... control device, 17a ... first inverter, 17b ... second inverter, 18, 22 ... switch, 20 ... inverter circuit, 21a ... first oscillation circuit, 21b ... 2nd oscillation circuit, 23 ... Paint coating device, 24 ... Marking device, W ... Workpiece, Wa ... Quenching annealing part, Wb ... Non-quenching annealing part.

Claims (4)

A heating coil disposed at a quenching part and an annealing part of the work supported by the support means, a high-frequency power source for supplying a high-frequency current of a predetermined frequency to the heating coil, a cooling means capable of cooling the work, and the work A mark providing means for applying a predetermined mark to the control means, and a control means for controlling these,
The control means supplies a high frequency current for quenching from the high frequency power source to the heating coil to quench the quenching part of the workpiece, and supplies the high frequency current for annealing from the high frequency power source to the heating coil after the quenching. A high frequency induction heating apparatus characterized in that the annealing portion of the workpiece is annealed and at least after the workpiece is annealed, the mark applying means is operated to apply a predetermined mark to the workpiece.   The high-frequency power source includes a first power supply unit that can supply a high-frequency current for quenching to the heating coil, and a second power source unit that can supply a high-frequency current for annealing to the heating coil. Item 2. The high frequency induction heating apparatus according to Item 1.   The high-frequency induction heating device according to claim 1 or 2, wherein the mark applying means is a paint application device that applies a predetermined color of paint to a workpiece or a marking device that applies a predetermined marking to the workpiece.   Mark detecting means capable of detecting a mark applied by the mark applying means, wherein the control means determines whether the workpiece is a non-defective product or a defective product based on the mark detected by the mark detecting device. The high frequency induction heating device according to any one of claims 1 to 3.

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