CN114150118B - Heat treatment device and heat treatment method - Google Patents

Heat treatment device and heat treatment method Download PDF

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Publication number
CN114150118B
CN114150118B CN202110679223.5A CN202110679223A CN114150118B CN 114150118 B CN114150118 B CN 114150118B CN 202110679223 A CN202110679223 A CN 202110679223A CN 114150118 B CN114150118 B CN 114150118B
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coil portion
lead portion
coil
heat treatment
workpiece
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CN114150118A (en
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平井大阳
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Toyota Motor Corp
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Toyota Motor Corp
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Induction Heating (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The heat treatment apparatus of the present invention heats the peripheral surface of a workpiece. The heat treatment device has a first coil part, a second coil part, a first lead part, and a second lead part. The first coil portion and the second coil portion are bent in a ring shape and are arranged to be spaced apart from each other in the axial direction. The first lead portion is connected to a distal end of the first coil portion, and supplies current to the first coil portion. The second lead portion is connected to a distal end of the second coil portion, and supplies current to the second coil portion. The first lead portion is disposed at a position rotated by a predetermined angle in the circumferential direction of the first coil portion with respect to the second lead portion.

Description

Heat treatment device and heat treatment method
Technical Field
The present invention relates to a heat treatment apparatus and a heat treatment method, and more particularly, to a heat treatment apparatus and a heat treatment method using induction heating by a coil.
Background
A method of inductively heating the peripheral surface of a long workpiece using an annular coil is known. For example. Japanese patent application laid-open No. 5-148531 discloses a technique of induction heating a peripheral surface of a workpiece by relatively moving the workpiece and a coil in an axial direction of the workpiece.
Disclosure of Invention
When induction heating a workpiece using such a coil, currents in opposite directions flow through a pair of mutually facing leads led out from the coil. This counteracts the magnetic field around the lead, and reduces the magnetic flux density in the loop. Here, when a plurality of annular coils are used with being spaced apart in the axial direction, there is a problem that the reduction in magnetic flux density is more remarkable and it is difficult to uniformly heat the peripheral surface of the workpiece. The same applies to induction heating of the peripheral surface of a work having another shape, not limited to the peripheral surface of a long work.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a heat treatment apparatus and a heat treatment method capable of heating the peripheral surface of a workpiece more uniformly.
The heat treatment apparatus according to one embodiment of the present invention heats the peripheral surface of a workpiece. The heat treatment apparatus includes: a first coil portion and a second coil portion which are bent in a ring shape and are arranged to be spaced apart from each other in an axial direction; a first lead portion connected to a distal end of the first coil portion and configured to supply a current to the first coil portion; and a second lead portion connected to a distal end of the second coil portion and configured to supply current to the second coil portion, wherein the first lead portion is disposed at a position rotated by a predetermined angle in a circumferential direction of the first coil portion with respect to the second lead portion.
This suppresses a decrease in magnetic flux density in the loop of the coil portion, and can uniformly heat the peripheral surface of the workpiece.
The angle is preferably 90 ° or more and 180 ° or less, more preferably 120 ° or more and 180 ° or less.
This makes it possible to disperse and cancel the effect of the magnetic field around the lead portion more effectively, and to heat the peripheral surface of the workpiece more uniformly.
The heat treatment apparatus further includes a relative movement portion that moves the first coil portion and the second coil portion relative to the workpiece in the axial direction.
This makes it possible to easily heat the long work.
The heat treatment apparatus further includes a relative rotation portion that relatively rotates the first coil portion and the second coil portion with the workpiece about axes of the first coil portion and the second coil portion.
This can heat the peripheral surface of the workpiece more uniformly.
The heat treatment method according to one embodiment of the present invention is a heat treatment method for heating the peripheral surface of a workpiece. The heat treatment method comprises the following steps: a coil portion arrangement step of arranging a first coil portion and a second coil portion, which are bent in a ring shape, so as to be spaced apart from each other in the axial direction; a lead portion arrangement step of arranging a first lead portion connected to a distal end of the first coil portion at a position rotated by a predetermined angle in a circumferential direction of the first coil portion with respect to a second lead portion connected to a distal end of the second coil portion; and a current supply step of supplying a current to the first coil portion via the first lead portion and supplying a current to the second coil portion via the second lead portion.
This suppresses a decrease in magnetic flux density in the loop of the coil portion, and can uniformly heat the peripheral surface of the workpiece.
The angle is preferably 90 ° or more and 180 ° or less, more preferably 120 ° or more and 180 ° or less.
This makes it possible to more effectively disperse and cancel the effect of the magnetic field around the lead portion, and to more uniformly heat the peripheral surface of the workpiece.
The heat treatment method further includes a relative movement step of relatively moving the first coil portion and the second coil portion with respect to the workpiece in the axial direction.
This makes it possible to easily heat the long work.
The heat treatment method further includes a relative rotation step of rotating the first coil portion and the second coil portion relative to the workpiece in the circumferential direction.
This can heat the peripheral surface of the workpiece more uniformly.
According to the present invention, a heat treatment apparatus and a heat treatment method capable of heating the peripheral surface of a workpiece more uniformly can be provided.
Drawings
Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals refer to like elements.
Fig. 1 is a schematic diagram of a circuit configuration of a heat treatment apparatus according to the present embodiment.
Fig. 2 is a front view of the heat treatment apparatus according to the present embodiment.
Fig. 3 is a schematic perspective view for explaining the coil portion and the lead portion of the present embodiment.
Fig. 4 is a plan view of a main part of the heat treatment apparatus of the present embodiment.
Fig. 5 is a flowchart showing a procedure of a heat treatment method in the heat treatment apparatus according to the present embodiment.
Fig. 6 is a graph showing a relationship between a peripheral surface temperature of a workpiece heated by the heat treatment apparatus according to the present embodiment and a heating time.
Detailed Description
The present invention will be described with reference to the following embodiments, but the invention according to the scope of the claims is not limited to the following embodiments. In addition, all the structures described in the embodiments are not necessarily required to solve the problem. For clarity of description, the following description and drawings are omitted and simplified as appropriate. In the drawings, the same elements are denoted by the same reference numerals.
Fig. 1 is a schematic diagram of the circuit configuration of a heat treatment apparatus 1 according to the present embodiment. The heat treatment apparatus 1 heats the peripheral surface of the workpiece W by induction heating.
The workpiece W is a heated member. The workpiece W in the present drawing has a long cylindrical shape, but is not limited thereto. The workpiece W may have an arbitrary length. Further, the work W may be a sphere shape, a hexahedral shape, or other polyhedral shape. In the present embodiment, the workpiece W is made of steel, and includes, for example, S48C, S C, SCM435, and the like. However, the material of the workpiece W is not limited thereto.
As shown in the figure, the heat treatment apparatus 1 includes an ac power source 2, a high-frequency oscillator 3, a transformer 4, a coil portion 5, and a lead portion 15.
The ac power supply 2 is a power supply for supplying electric power to the coil unit 5 of the heat treatment apparatus 1. The ac power source 2 may be a commercial ac power source.
The high-frequency oscillator 3 is connected to the ac power supply 2, and is an oscillator that converts the ac current of the ac power supply 2 into a high-frequency current.
The transformer 4 is connected to the high-frequency oscillator 3, and is a current transformer for transforming the high-frequency current output from the high-frequency oscillator 3. The transformer 4 is connected to the lead portion 15, and supplies a variable-current high-frequency current to the coil portion 5 via the lead portion 15.
The coil portion 5 is a conductor through which a variable-current high-frequency current flows. The coil portion 5 may be a good conductor such as copper alloy. The coil portion 5 is bent in a ring shape, and the work W is inserted into the hollow portion inside the ring. The coil portion 5 generates eddy current by applying an alternating magnetic field generated by a high-frequency current flowing in itself to the workpiece W, thereby heating the peripheral surface of the workpiece W.
The coil portion 5 has a first coil portion 6 and a second coil portion 7. The first coil portion 6 and the second coil portion 7 are disposed so as to be spaced apart from each other in the axis a direction so that the axial direction thereof is substantially parallel to the axis a direction of the workpiece W. Both ends of each of the first coil part 6 and the second coil part 7 are opened, and one ends of the first coil part 6 and the second coil part 7 are electrically connected to each other. In the present embodiment, the first coil portion 6 and the second coil portion 7 have substantially the same shape, but may have different shapes. Hereinafter, when the first coil portion 6 and the second coil portion 7 are collectively referred to as a coil portion 5, they may be simply referred to as a coil without distinguishing any of the first coil portion 6 and the second coil portion 7.
The lead portion 15 is led out from the coil portion 5, and is a lead terminal that relays connection between the coil portion 5 and the transformer 4 and connection between the coils. The lead portion 15 has a first lead portion 16 and a second lead portion 17.
The first lead portion 16 is connected to the distal end of the first coil portion 6, and supplies a high-frequency current to the first coil portion 6. The first lead portion 16 includes a primary side first lead portion 16a and a secondary side first lead portion 16b as a pair of leads facing each other in the radial direction of the first coil portion 6. In the primary side first lead portion 16a, one end is connected to the positive electrode side of the transformer 4, and the other end is connected to one end of the first coil portion 6. In the secondary side first lead portion 16b, one end is connected to the other end of the first coil portion 6, and the other end is connected to one end of the primary side second lead portion 17a of the second lead portion 17.
The second lead portion 17 is connected to the distal end of the second coil portion 7, and supplies a high-frequency current to the second coil portion 7. The second lead portion 17 includes a primary side second lead portion 17a and a secondary side second lead portion 17b as a pair of leads facing each other in the radial direction of the second coil portion 7. In the primary side second lead portion 17a, one end is connected to the secondary side first lead portion 16b, and the other end is connected to one end of the second coil portion 7. In the secondary side second lead portion 17b, one end is connected to the other end of the second coil portion 7, and the other end is connected to the negative side of the transformer 4.
In the present embodiment, the first lead portion 16 and the second lead portion 17 have substantially the same shape, but may have different shapes. Hereinafter, when the first lead portion 16 and the second lead portion 17 are collectively referred to as "lead portion 15" in some cases. In the case where the first lead portion 16 or the second lead portion 17 is referred to as a "primary side" and "secondary side" without distinction, it may be referred to simply as a "lead".
In this way, in the heat treatment apparatus 1, the high-frequency current flows in the coil portion 5, and induction heating is performed on the outer periphery of the workpiece W inserted in the hollow portion inside the loop of the coil portion 5.
Fig. 2 is a front view of the heat treatment apparatus 1 of the present embodiment. The X-axis direction of the drawing is the left-right direction of the paper surface, the Y-axis direction is the depth direction of the paper surface, and the Z-axis direction is the up-down direction of the paper surface. In the present figure, a workpiece W is shown together with a heat treatment apparatus 1. The axis a, which is the axis in the longitudinal direction of the workpiece W, is a direction substantially parallel to the Z-axis direction.
As shown in the drawing, the heat treatment apparatus 1 includes a coil unit 5, center pins 20, 21, a cylinder 22, a support arm 23, a ball screw 24, a motor 25 for moving up and down, and a motor 26 for rotating. In the present figure, the ac power supply 2, the high-frequency oscillator 3, the transformer 4, and the lead portion 15 are omitted.
The center pins 20 and 21 are members for gripping the workpiece W while making the axis a of the workpiece W substantially coincide with the axes of the first coil portion 6 and the second coil portion 7. The center pins 20 and 21 are arranged to be spaced apart from each other in the Z-axis direction. The center pins 20 and 21 have distal ends protruding and engaged with recesses provided in the respective end surfaces of the workpiece W in the Z axis direction.
The center pin 20 is connected to the cylinder 22, and the center pin 21 is connected to the second support arm 23b of the support arm 23. The center pin 21 is rotatable by the motor 26 for rotation, and rotates the workpiece W around the axis a by itself.
As a means for gripping the workpiece W, a chuck may be used instead of the center pins 20 and 21.
The cylinder 22 is a member for fixing the center pin 20 to a first support arm 23a of the support arm 23.
The support arm 23 includes a first support arm 23a and a second support arm 23b arranged apart from each other in the Z-axis direction. The first support arm 23a and the second support arm 23b move in the Z-axis direction while maintaining a predetermined interval, thereby moving the workpiece W in the Z-axis direction relative to the coil portion 5.
The ball screw 24 is disposed parallel to the Z axis, and is fixedly connected to the first support arm 23a and the second support arm 23b by a nut member.
The up-and-down movement motor 25 is a drive motor for moving the workpiece W in the Z-axis direction. The motor 26 for rotation is a drive motor for rotating the workpiece W about the axis a.
The center pins 20 and 21, the support arm 23, the ball screw 24, and the motor 25 for vertical movement are also referred to as relative movement portions because they move the first coil portion 6 and the second coil portion 7 relative to the workpiece W in the Z-axis direction. This makes it possible to easily heat the long workpiece W without enlarging the scale of the coil portion 5 such as the coil number in the Z-axis direction. The moving body in the present embodiment is the workpiece W, but may be the first coil portion 6 and the second coil portion 7.
The rotating motor 26 and the center pin 21 are also referred to as relative rotation portions because they relatively rotate the first coil portion 6 and the second coil portion 7 about the axis a while maintaining the concentric positions with the workpiece W. This can uniformly heat the peripheral surface of the workpiece W. The rotating body in the present embodiment is the workpiece W, but may be the first coil portion 6 and the second coil portion 7.
The heat treatment apparatus 1 may further include a cooling jacket for spraying a quenching liquid onto the heated workpiece W to cool the workpiece W.
Fig. 3 is a schematic perspective view for explaining the coil unit 5 and the lead unit 15 according to the present embodiment. In the present embodiment, the first lead portion 16 is disposed at a position rotated by a predetermined angle θ in the circumferential direction of the first coil portion 6 with respect to the second lead portion 17. Specifically, the angle θ is an angle formed on the XY plane between a straight line connecting the connection portion of the primary side first lead portion 16a to the first coil portion 6 and the center of curvature of the first coil portion 6 and a straight line connecting the connection portion of the primary side second lead portion 17a to the second coil portion 7 and the center of curvature of the second coil portion 7. By setting the angle θ, it is possible to disperse the effect of canceling the magnetic field by the current I flowing through the mutually facing leads. Accordingly, the heat treatment apparatus 1 can uniformly heat the peripheral surface of the workpiece, since the decrease in the magnetic flux density in the ring is suppressed.
Here, the angle θ may be 90 ° or more and 180 ° or less. The angle θ is preferably 120 ° or more and 180 ° or less, and more preferably 180++5°. In this case, the effect of the canceling magnetic field can be dispersed more effectively, and the heat treatment apparatus 1 can heat the peripheral surface of the workpiece more uniformly.
The angle θ may be determined based on at least one of the distance R between the leads facing each other, the intensity I of the current flowing through the coil portion 5, the loop radius R, and the distance d between the coils in the Z-axis direction. The distance r between the leads indicates the distance between the primary side first lead portion 16a and the secondary side first lead portion 16b, and the distance between the primary side second lead portion 17a and the secondary side second lead portion 17b. The distances between the primary side first lead portion 16a and the secondary side first lead portion 16b, and between the primary side second lead portion 17a and the secondary side second lead portion 17b are the same, but may be different. The ring radius R may be a radius of curvature of the coil portion 5.
The angle θ may be determined based on at least one of the relative movement speed between the coil portion 5 and the workpiece W and the relative rotation speed between the coil portion 5 and the workpiece W. This can uniformly heat the peripheral surface of the workpiece, and can shorten the cycle time.
The details of these wirings are shown in fig. 4 in consideration of the arrangement of the first lead portion 16 and the second lead portion 17. Fig. 4 is a plan view of a main part of the heat treatment apparatus 1 of the present embodiment. In the present figure, the first coil portion 6 and the second coil portion 7 are illustrated as having different ring radii R, but the actual ring radii R may be substantially the same or different from each other. In the present embodiment, the loop radius R of the first coil portion 6 and the loop radius R of the second coil portion 7 are substantially the same.
The negative electrode side terminal 110 is connected to the negative electrode side of the transformer 4, and is formed so as to be bent along the outer periphery of the first coil portion 6 and the second coil portion 7 so as to surround the outer periphery. The secondary side second lead portion 17b is connected to the negative side terminal 110.
The positive electrode side terminal 100 is connected to the positive electrode side of the transformer 4, and is formed by bending along the outer periphery so as to surround the outer periphery of the negative electrode side terminal 110. The primary side first lead portion 16a is connected to the positive side terminal 100.
The intermediate terminal 120 is formed to be bent between the negative electrode side terminal 110 and the positive electrode side terminal 100. The secondary side first lead portion 16b and the primary side second lead portion 17a are connected to the intermediate terminal 120.
The current I supplied from the positive electrode side terminal 100 is supplied to the primary side first lead portion 16a, and flows to the first coil portion 6 and the secondary side first lead portion 16b. The current I is supplied to the primary side second lead portion 17a via the intermediate terminal 120, and flows to the negative side terminal 110 via the second coil portion 7 and the secondary side second lead portion 17b.
By adopting such a configuration, the first lead portion 16 and the second lead portion 17 can be easily arranged according to the set angle θ.
Fig. 5 is a flowchart showing a procedure of a heat treatment method in the heat treatment apparatus 1 according to the present embodiment.
First, the angle θ is determined (step S01: angle determining step). Next, the first coil portion 6 and the second coil portion 7 are arranged so as to be spaced apart from each other in the axial direction (step S02: coil portion arrangement step). At this time, the orientations of the first coil portion 6 and the second coil portion 7 are adjusted according to the angle θ. Next, the first lead portion 16 is disposed at a position rotated by an angle θ in the circumferential direction of the coil portion 5 with respect to the second lead portion 17 (step S03): and a lead portion arrangement step). The first coil portion 6 and the first lead portion 16, and the second coil portion 7 and the second lead portion 17 may be connected in advance, respectively. In this case, steps S02 and S03 are performed in parallel. Next, the workpiece W is inserted substantially coaxially into the hollow portions in the rings of the first coil portion 6 and the second coil portion 7, and is fixed by the center pins 20, 21 (step S04): workpiece insertion step). Next, the up-and-down movement motor 25 and the rotation motor 26 are turned on, and the coil portion 5 and the workpiece W are relatively moved and relatively rotated (step S05): relative movement and relative rotation steps). Next, the ac power supply 2 and the high-frequency oscillator 3 are turned on, and a current is supplied to the first coil portion 6 via the first lead portion 16 and a current is supplied to the second coil portion 7 via the second lead portion 17 (step S06): a current supply step).
Fig. 6 is a diagram showing a relationship between the peripheral surface temperature of the workpiece W heated by the heat treatment apparatus 1 according to the present embodiment and the heating time. The horizontal axis of the figure indicates the heating time, that is, the time T (S) for supplying the current in step S06 of fig. 5, and the vertical axis indicates the temperature T (°c) of the arbitrary region S of the peripheral surface of the workpiece W. The broken line represents a graph when θ=0 (°), and the solid line represents θ=θ 1 (>0 deg.).
When θ=0, it is initially T 0 The temperature of the region S of (2) rises sharply to T due to induction heating by the coil part 5 1 . Further, since the coil part 5 rotates, when the region S is opposed to the portion of the coil part 5 where the magnetic flux density is reduced due to the lead part 15, the temperature of the region S is reduced by Δt 0 . The recessed portion of the broken line in the present figure indicates that the temperature is reduced due to the region S opposing the magnetic flux density reduced portion of the coil portion 5. In order to compensate for this temperature decrease and to make the quality of the heated workpiece W uniform, it is necessary to rotate the coil 5 by a predetermined necessary number of rotations N while the coil 5 passes through the region S. For example, when θ=0, the necessary rotation number N is 3 (rotations).
However, at θ=θ 1 At this time, the temperature of the region S decreases by ΔT due to the opposition to the magnetic flux density decreasing portion 1 Ratio DeltaT 0 Is small. The reason is that, at θ=θ 1 In this case, since the first lead portion 16 and the second lead portion 17 are circumferentially spaced apart, the magnetic flux density decreasing portion is dispersed, and as a result, decrease in magnetic flux density is suppressed. Therefore, in this case, the necessary rotation number N can be set to be small, and for example, the necessary rotation number N can be set to 1 (rotation).
Here, the necessary number of revolutions N has an influence on the cycle time. For example, the length of the workpiece W in the Z-axis direction is 600 (mm), and the relative movement speed of the workpiece W and the coil portion 5 is currently 15 (mm/s). In this case, the cycle time was 600 (mm)/15 (mm/s) =40(s).
Here, the sum of the thicknesses of the coil portions 5 in the Z-axis direction, that is, the thicknesses of the first coil portion 6 and the second coil portion 7 and the distance d therebetween is 15 (mm). At this time, the time required for the coil portion 5 to pass through the thickness of the coil portion 5 is 15 (mm)/15 (mm/s) =1(s).
In the case where θ=0, since the necessary rotation number N is 3 (rotations), the lowest relative rotation speed of the workpiece W and the coil portion 5 is 3 (rotations)/1(s) =3 (rotations/s). In this case, in order to shorten the cycle time, it is considered to increase the relative movement speed, but in the increase of the relative movement speed, the necessary rotation number N becomes the speed limit, so it is also necessary to increase the relative rotation speed at the same time. However, in order to increase the relative rotation speed, it is necessary to use a high-performance rotating motor 26, and the cost increases. Particularly, when the workpiece W is a weight of 10kg or more such as an automobile part, the cost is expected to be significantly increased, and it is actually difficult to shorten the cycle time.
On the other hand, at θ=θ 1 In the case of (c), since the necessary rotation number N is 1 (rotation), the minimum relative rotation speed of the workpiece W and the coil portion 5 is suppressed to 1 (rotation)/1(s) =1 (rotation/s). By setting the relative rotation speed to 3 (revolutions/s), the relative movement speed can theoretically be increased by 3 times, and the cycle time can be shortened by 67%. However, in practice, the increase in the relative movement speed should be considered to be such that the temperature rise speed becomes the limit. Here, the temperature is raised to T 1 The time required for (e.g. 1000 ℃) is currently 10(s), but can be shortened to a maximum of 5.7(s). In this case, the relative movement speed can be increased to 15 (mm/s). Times.10 (s)/5.7(s). Apprxeq.26.3 (mm/s). Thus, the cycle time was 600 (mm)/26.3 (mm/s) =22.8(s), and even when the temperature rise rate was considered, the cycle time was reduced by 43% as compared with the case where θ=0.
In this way, according to the heat treatment apparatus 1 of the present embodiment, the magnetic flux received by the workpiece W during the passage through the coil portion 5 is uniformized, and the cycle time can be easily shortened while maintaining the uniform quality.
The present invention is not limited to the above-described embodiments, and can be appropriately modified within a scope not departing from the gist thereof. For example, in the above embodiment, the heat treatment apparatus 1 has two sets of coils, but the number n of coils may be 3 or more. At this time, the angle θ is θ n + -30 DEG, preferably theta n 15 DEG, more preferably theta n 5 deg.. Wherein θ n =360 (°)/n. For example, when n=3, the angle θ may be 90 ° or more and 120 ° or less, preferably 105 ° or more and 120 ° or less, and more preferably 115 ° or more and 120 ° or less. The angle θ may be determined based on at least one of the distance R between the pair of leads, the intensity I of the current, the loop radius R, the distance d between the coils, and the value of n. This makes it possible to disperse and cancel the effect of the magnetic field more effectively, and the heat treatment apparatus 1 can heat the peripheral surface of the workpiece more uniformly.

Claims (10)

1. A heat treatment apparatus for heating a peripheral surface of a workpiece, comprising:
a first coil portion and a second coil portion which are bent in a ring shape and are arranged to be spaced apart from each other in an axial direction;
a first lead portion connected to a distal end of the first coil portion and supplying a current to the first coil portion, the first lead portion including a primary side first lead portion and a secondary side first lead portion;
a second lead portion connected to a distal end of the second coil portion and supplying a current to the second coil portion, the second lead portion including a primary side second lead portion and a secondary side second lead portion;
a negative electrode side terminal formed along an outer periphery of the first coil portion and the second coil portion so as to surround the outer periphery, the negative electrode side terminal being connected to the secondary side second lead portion;
a positive electrode-side terminal formed along an outer periphery of the negative electrode-side terminal so as to surround the outer periphery, and connected to the primary-side first lead portion; and
an intermediate terminal formed between the negative electrode side terminal and the positive electrode side terminal in a bent manner and connected to the secondary side first lead portion and the primary side second lead portion,
the first lead portion is disposed at a position rotated by a predetermined angle in a circumferential direction of the first coil portion with respect to the second lead portion.
2. The heat treatment apparatus according to claim 1, wherein,
the angle is between 90 DEG and 180 deg.
3. The heat treatment apparatus according to claim 2, wherein,
the angle is 120 DEG to 180 deg.
4. The heat treatment apparatus according to claim 1, wherein,
the workpiece processing apparatus further includes a relative movement portion that moves the first coil portion and the second coil portion relative to the workpiece in the axial direction.
5. The heat treatment apparatus according to any one of claims 1 to 4, wherein,
the workpiece rotating device further includes a relative rotation unit that rotates the first coil unit and the second coil unit relative to the workpiece about axes of the first coil unit and the second coil unit.
6. A heat treatment method for heating the peripheral surface of a workpiece, comprising:
a coil portion arrangement step of arranging a first coil portion and a second coil portion, which are bent in a ring shape, so as to be spaced apart from each other in the axial direction;
a lead portion arrangement step of arranging a first lead portion including a primary side first lead portion and a secondary side first lead portion, which are connected to a distal end of the first coil portion, at a position rotated by a predetermined angle in a circumferential direction of the first coil portion with respect to a second lead portion including a primary side second lead portion and a secondary side second lead portion, which are connected to a distal end of the second coil portion, and connecting the secondary side second lead portion to a negative electrode side terminal, connecting the primary side first lead portion to a positive electrode side terminal, and connecting the secondary side first lead portion and the primary side second lead portion to an intermediate terminal, the negative electrode side terminal being formed so as to be bent along an outer periphery of the first coil portion and the second coil portion so as to surround the outer periphery of the negative electrode side terminal, and the positive electrode side terminal being formed so as to be bent along the outer periphery of the negative electrode side terminal, the intermediate terminal being formed so as to be bent between the negative electrode side terminal and the positive electrode side terminal;
and a current supply step of supplying a current to the first coil portion via the first lead portion and supplying a current to the second coil portion via the second lead portion.
7. The heat treatment method according to claim 6, wherein,
the angle is between 90 DEG and 180 deg.
8. The heat treatment method according to claim 7, wherein,
the angle is 120 DEG to 180 deg.
9. The heat treatment method according to claim 6, wherein,
the method further includes a relative movement step of relatively moving the first coil portion and the second coil portion with respect to the workpiece in the axial direction.
10. A heat treatment method according to any one of claims 6 to 9, wherein,
the method further includes a relative rotation step of rotating the first coil portion and the second coil portion relative to the workpiece in the circumferential direction.
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