KR100557309B1 - High frequency induction heating coil - Google Patents

Abstract

It is to provide a high frequency induction heating coil body for tempering heating which can shorten the work preparation time according to the model change, and can obtain a better tempering quality at a lower cost than before.

High frequency induction heating of the outer circumferential surface of a shaft member (for example, the inner shaft 2) having a plurality of different diameter outer circumferences or the inner circumferential surface of a cylindrical member (for example, the outer ring 41) having different diameter inner circumferences In the induction heating coil body, a plurality of linear heating elements arranged in parallel to the axial direction of the axial member or the tubular member and disposed to face each other on the outer circumferential surface of the axial member or the inner circumferential surface of the cylindrical member. A connection for connecting the conductors 22 to 25, the connecting conductor 26 to which one end of the plurality of heating conductors are connected, and the other end portion of the plurality of heating conductors and the lead portions 30 and 31 to be connected to the high frequency power supply 29. Conductors 27 and 28, respectively.

Tempering quality, tempering treatment, high frequency induction heating, connection conductor, heating conductor

Description

High frequency induction heating coil body {HIGH FREQUENCY INDUCTION HEATING COIL}

1 is a perspective view showing a current path in a high frequency induction heating coil body for tempering processing according to a first embodiment of the present invention.

Fig. 2 is a perspective view showing a situation when high frequency induction heating is performed on the outer circumferential surface of a hub unit inner shaft using a high frequency induction heating coil body for tempering treatment according to the first embodiment of the present invention.

4 is a perspective view showing another modification of the high frequency induction heating coil body for tempering according to the first embodiment of the present invention.

Fig. 5 is a perspective view showing a current path in the high frequency induction heating coil body for tempering treatment according to the second embodiment of the present invention.

Fig. 6 is a perspective view showing a situation when high frequency induction heating is performed on the inner circumferential surface of the outer ring of the hub unit using the high frequency induction heating coil body for tempering according to the second embodiment of the present invention.

Fig. 7 is a perspective view showing a modification of the high frequency induction heating coil body for tempering treatment according to the second embodiment of the present invention.

Fig. 8 is a perspective view showing another modification of the high frequency induction heating coil body for tempering according to the second embodiment of the present invention.

Fig. 9 is a perspective view of a high frequency tempering device which has been conventionally used for tempering the outer circumferential surface of the hub unit inner shaft.

Fig. 10 is a perspective view of a high frequency tempering device which has been conventionally used for tempering the inner circumferential surface of the hub ring outer ring.

(Explanation of the sign)

20 ... High frequency induction heating coil body for internal shaft tempering

21 ... inner shaft of hub unit

21a ... outer surface

22 ... first heating conductor

23 ... second heating conductor

24 ... third heating conductor

25 ... fourth heating conductor

26 ... first connection conductor

27 ... second connection conductor

28 ... Third connection conductor

29 ... high frequency power supply

30 ... first lead for electricity supply

31 ... 2nd lead for electricity supply

32 ... magnetic material

40 ... High frequency induction heating coil for outer ring tempering

41 ... outer ring of hub unit

41a ... around us

42 ... first heating conductor

43 ... second heating conductor

44 ... third heating conductor

45 ... fourth heating conductor

46 ... first connection conductor

47 ... second connection conductor

48 ... third connection conductor

49 ... fourth connection conductor

50 ... fifth connection conductor

51 ... first lead for electricity supply

52 ... 2nd lead for electricity supply

53 ... high frequency power supply

54 ... Magnetic material

R, S ... arrows (current paths)

The present invention relates to a high frequency induction heating coil body for high frequency induction heating of an outer circumferential surface of an axial member having different diameter outer circumference portions (uneven outer circumferential portion) or an inner circumferential surface of a cylindrical member having different diameter inner circumference portions. For example, it is suitable to be used for high frequency induction heating (e.g., tempering heating) of the outer circumferential surface of the hub unit inner shaft (shaft member) or the inner circumferential surface of the outer ring (cylindrical member) serving as the bearing portion of the automobile wheel. It relates to a high frequency induction heating coil body.

Fig. 9 shows a high frequency tempering device 1 for internal shaft tempering heating which is conventionally used. The high frequency tempering device 1 is an outer circumferential surface of the inner shaft 2 after quenching the outer circumferential surface 2a of the inner shaft (axial member having an outer circumferential surface of the concave-convex shape, 2) of the hub unit having a plurality of different diameter outer circumferential portions. An apparatus for tempering the process (2a), comprising a high-frequency induction heating coil body 3 formed by connecting a large diameter winding portion 3a and a small diameter winding portion 3b in series, and silicon for promoting high frequency induction heating. A steel core (Core) 4 is provided. Moreover, the core 4 mentioned above has the frame 4b which encloses the movable stand 4a which moves up and down in the state which mounted the inner shaft 2, and the inner shaft 2 hold | maintained on the said movable stand 4a. It is a rectangular frame-shaped member formed by combining with each other.

When the quenched inner shaft 2 is subjected to high frequency induction heating for the tempering treatment in the high frequency tempering device 1, the inner shaft 2 on the work-piece supporting jig 5 mounted on the moving table 4a. 9 is moved from the position indicated by the dashed line in FIG. 9 to the heating position indicated by the solid line, and the inner shaft 2 is held between the workpiece support jig 5 and the workpiece support shaft 6 (see FIG. 9). do. Accordingly, the large diameter portion M of the inner shaft 2 is inserted into the large-diameter winding portion 3a of the high frequency induction heating coil body 3 with a necessary interval, and the small diameter portion of the inner shaft 2 ( N) is inserted into the small diameter winding portion 3b of the high frequency induction heating coil body 3 with a small gap, and the lower portion of the winding portion 3b is the upper surface of the large diameter portion M of the inner shaft 2. It is arranged so as to face each other with a gap of the required space on the upper surface. Then, the inner shaft 2 and the high frequency induction heating coil body 3 are installed at the position surrounded by the core 4 (that is, the inner shaft 2, which is a tempering object part, is set to be part of the core 4). Thus, under such a state, the outer peripheral surface 2a of the inner shaft 2 is required by flowing a high frequency current from the high frequency power supply (oscillator having a frequency of about 200 to 300 Hz, 7) to the high frequency induction heating coil body 3. High-frequency induction heating at the tempering temperature of), and then immediately cooled to tempering treatment.

10 shows the high frequency tempering device 10 for outer ring tempering heating currently used conventionally. The high frequency tempering device 10 is configured to quench the inner circumferential surface 11a of the outer ring (cylindrical member having the inner circumferential surface of the concave-convex shape, 11) of the hub unit having a plurality of different inner diameters of the outer ring 11 of the outer ring 11. A device for tempering the inner circumferential surface 11a, and a high frequency induction heating coil body 12 formed by spirally winding a conductor wire to have a constant diameter, and a silicon steel core for promoting high frequency induction heating of the outer ring 11 ( 13). In addition, the above-described core 13 includes a movable table 13a that moves up and down while the outer ring 11 is loaded, and an outer ring 11 held by the work support jig 14 on the movable table 13a. It is a frame-shaped member formed by combining the surrounding frame-shaped part 13b and the shaft part 13c of the magnetic material product integrally provided in the inner side of the said frame-shaped part 13b. In addition, the high frequency tempering device 10 for outer ring tempering heating shown in FIG. 10 is basically the same structure as the said high frequency tempering device 1 for inner shaft tempering heating, and the hollow of the outer ring 11 which is a tempering object part. The point where the shaft portion 13c of the core 13 penetrates into the 2) part is different from the case of the high frequency tempering device 1 for internal shaft tempering heating. In this manner, conventionally, the high-frequency tempering device 10 as described above is used to temper the inner circumferential surface 11a of the outer ring 11 after the quenching treatment.

By the way, when heating up to the inside of a to-be-heated object (for example, the inner shaft 2, the outer ring 11, etc.) with respect to a high frequency induction heating, the method of making the penetration depth of a high frequency induction current deeper. As a conventional method, it is common to adopt a method of setting the frequency of the high frequency current flowing in the high frequency induction heating coil bodies 3 and 12 low, and the frequency is selected from 200 to 300 Hz even in the conventional high frequency tempering devices 1 and 10. However, when the low frequency is selected, the effect of penetration depth becomes remarkable in the temperature range above the magnetic transformation point (Curie point), and the effect cannot be expected in the heating in the temperature region below the magnetic transformation point such as tempering heating. . Incidentally, the penetration depth of the induced current at room temperature is about 1.0 mm at 260 Hz and about 0.36 mm at 2 Hz. It is understood that the depth of the hardened layer of the hardened layer of the hub unit is approximately 2.0 to 4.0 mm, and the temperature increase by the high frequency induction heating during the tempering treatment is limited to the surface portion. Therefore, in the tempering treatment (tempering heating) by high frequency induction heating, considering the fact that the rate of temperature rise due to heat conduction after heating is large, in order to obtain good tempering quality, the temperature of the surface of the heated object during high frequency induction heating is obtained. The adjustment of the distribution is very important.

In the high frequency tempering devices 1 and 10 used conventionally, although the whole part to be tempered, such as the inner shaft and the outer ring 11, is heated and heated up, the surface of the tempering object area | region to be heated The temperature distribution is often influenced by the shape, and there is a phenomenon that, for example, the thick flesh portion is difficult to warm up, and the thin flesh portion is easy to warm up. In addition, since the shape dependency is high, it is actually difficult to adjust the surface temperature distribution of the tempering target region. Furthermore, when there are a plurality of models of tempering target parts and different shape dimensions, it is true that it is very difficult to obtain good tempering quality for all parts using the same (single) core. In addition, in the case where a dedicated core (for example, the silicon steel cores 4 and 13 described above) is prepared for each of the tempering target parts with respect to the plurality of tempering target parts, the weight of the core is 45-. Since it is 50 kg, it is too heavy for one worker to maintain and move, therefore, it requires an unreasonable problem, such as requiring a long time to replace the tempering core for each model change, and lowering productivity.

The present invention has been made in consideration of such a situation, and the above object can be shortened the work preparation time according to the model change, and furthermore, better tempering quality can be obtained at a lower cost than before. The present invention provides a high frequency induction heating body for tempering heating.

In order to achieve the above object, in the present invention, for the tempering treatment of high frequency induction heating for the tempering treatment the outer peripheral surface of the axial member having a plurality of different outer peripheral portion, or the inner peripheral surface of the cylindrical member having different inner peripheral portion In the high frequency induction heating body of

(a) a plurality of linear heating conductors disposed parallel to each other on the axial direction of the axial member or the cylindrical member and disposed to face each other on the outer circumferential surface of the axial member or the inner circumferential surface of the cylindrical member;

(b) a connecting conductor to which one end of the plurality of heating conductors is connected,

(c) Connection conductors for connecting the other ends of the plurality of heating conductors and the lead portion for supplying electricity connected to the high frequency power supply are respectively provided.

In the present invention, three or more heating conductors are provided.

In the present invention, the connecting conductor to which one end of the plurality of heating conductors is connected is configured to have a rounded ring shape, an arc shape, or a straight line shape.

In a preferred embodiment of the present invention, the axial member or the cylindrical member with respect to the outer circumferential surface of the metal axial member having a concave-convex surface or the inner circumferential surface of the metal cylindrical member having a concave-convex surface that is a heated surface including a hardened hardened layer requiring tempering heating A plurality of conductors parallel to the axis line are disposed to face each other at predetermined intervals on the outer circumferential surface or inner surface, and the entire heated surface is uniformed by flowing an induced current parallel to the axis to the heated surface. It is going to raise the temperature. In addition, in order to be able to arbitrarily adjust the temperature distribution in a to-be-heated surface, the magnetic material which changes the space | interval (distance) between the said some heating conductor and a to-be-heated surface, or can adjust the magnetic flux density of a high frequency magnetic field in a conductor. It is supposed to be fitted.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described with reference to FIGS.

FIG. 1: shows the high frequency induction heating coil body 20 which concerns on Example 1 of this invention, The said high frequency induction heating coil body 20 is the outer peripheral surface 21a of the inner shaft 21 of the hub unit after a quenching process (refer FIG. 2). It is used to induction heating (tempering heating) for the tempering treatment. As shown in FIG. 1, the high frequency induction heating coil body 20 of the present embodiment is a structure formed by connecting a conductive pipe material having a rectangular cross section so as to form a predetermined shape. Heating conductors 22, 23, 24, 25 of the linear first to fourth elements arranged parallel to the axial direction of the inner shaft 21 and facing each other on the outer circumferential surface 21a of the inner shaft 21; In the first end of the heating conductors 22 to 25 (the lower end in FIG. 1), the first connection conductor 26 having a rounded loop and the other end opposite to the one end of the heating conductors 22 to 25 described above (in FIG. 1). For the first electric supply connected between the second connection conductor 27 having a circular ring shape and the second connection conductor 28 having an arc shape, and the second connection conductor 27 connected to each of the upper ends) and the second connection conductor 27 and the high frequency power supply 29. Lead section 30 and second connection diagram The first connection 28 between the high frequency power source 29 is composed of two electricity supply leads 31 for part of the

More specifically, at both positions of the first and second heating conductors 22 and 23 at the angular interval θ1, both ends thereof are connected to the first and second connecting conductors 26 and 27, respectively, and the third and fourth At the positions where the heating conductors 24 and 25 have the angular spacing θ2, their both ends are connected to the first connecting conductor 26 and the third connecting conductor 28, respectively. In addition, the magnitude | size of the above-mentioned angular intervals (theta) 1 and (theta) 2 can be set arbitrarily according to a heating purpose. The first and fourth heating conductors 22, 25 and the second and third heating conductors 23, 24 are arranged at positions symmetrical with each other in the first and second connecting conductors 26, 27 having a rounded ring shape. . Further, the first to fourth heating conductors 22 to 25 are arranged vertically in the inner diameter side of the first connecting conductor 26, and the upper ends thereof are the lower surface portions of the second and third connecting conductors 27 and 28. Is connected to.

In this way, when a high frequency current is supplied to the high frequency induction heating coil body 20 from the high frequency power source 29 via the first and second electrical supply leads 30 and 31, as indicated later, the arrow R in FIG. The high frequency current flows through the current path. In the above case, the conductor portion α between the first and second heating conductors 22 and 23 and the conductor portion β between the third and fourth heating conductors 24 and 25 among the first connecting conductors 26, At both ends of the conductor portion γ between the first and second heating conductors 22 and 23 of the second connecting conductor 27, the high frequency voltage is in phase and at the same potential. Therefore, a high frequency current does not flow in these conductor parts (alpha), (beta), (gamma).

On the other hand, the above-mentioned second and third connection conductors 27 and 28, and the first and second electrical supply leads 30 and 31 are arranged to face each other in parallel form with a slight gap therebetween. Although the illustration is omitted, an insulating plate is interposed between them. Further, the hollow portions of the first to fourth heating conductors 22 to 25, the first to third connecting conductors 26 to 28, and the first and second electrical supply leads 30 and 31, respectively, which are made of a conductive pipe material. In the middle, the coolant supplied from the coolant supply mechanism other than the drawing flows. Moreover, in the high frequency induction heating coil body 20 of this embodiment, as shown in FIG. 2, it is the location of the one end part of the 1st-4th heating conductors 22-25, and the 1st-4th heating conductors 22-25. And magnetic materials 32 for magnetic flux concentration are provided at locations near the connection portions of the first and second connecting conductors 26, respectively.

Here, the order of the high frequency induction heating for the tempering treatment of the outer circumferential surface 21a of the inner shaft 21 using the high frequency induction heating coil body 20 described above is as follows.

First, the inner shaft 21, which is a tempering object part, is fixed by a work support jig outside the drawing, and the high frequency induction heating coil body 20 is moved by a lifting mechanism other than the drawing, for example, and shown in FIG. As described above, at the position above the flange portion F of the inner shaft 21, the axis of the inner shaft 21 and the axis of the high frequency induction heating coil body 20 (center lines of the first and second connecting conductors 26 and 27). Place it in a state where it is set in accordance with. As a result, the first to fourth heating conductors 22 to 25 of the high frequency induction heating coil body 20 are arranged in parallel with respect to the axis, and have a predetermined interval with respect to the outer peripheral surface 21a of the inner shaft 21 in parallel. To face each other. Thereafter, a high frequency current is supplied to the high frequency induction heating coil body 20 from the high frequency power source 29 via the first and second electrical supply leads 30 and 31, and the inner shaft 21 is connected with a work support jig other than the drawing. Drive rotation around the axis.

In this case, as the high frequency power is supplied to the high frequency induction heating coil body 20, a high frequency current flows in the high frequency induction heating coil body 20 along a path in the direction indicated by the arrow R in FIG. In this case, high-frequency currents flow each other along a path opposite to the arrow R direction. Specifically, the high frequency electric current in the case shown in FIG. 1 is a high frequency power supply 29, the lead part 30 for 1st electrical supply, the conductor part A of the 2nd connection conductor 27, the 1st heating conductor 22, and 1st connection. At the same time, a high frequency flows through the conductor portion B (conductor portion between the conductor portions α and β) of the conductor 26, the fourth heating conductor 25, the third connecting conductor 28 and the second The power source 29, the lead portion 30 for the first electric supply, the conductor portion C (the conductor portion facing each other in the conductor portion A) of the second connecting conductor 27, the second heating conductor 23, and the first connecting conductor 26. It flows through the conductor portion D (the conductor portion facing each other with the conductor portion B), the third heating conductor 24, and the second lead portion 31 for electric supply. In this way, the outer circumferential surface 21a of the inner shaft 21 in the rotational driving state induces a high frequency current flowing through the linear first to fourth heating conductors 22 to 25 disposed to face the outer circumferential surface 21a. High frequency induction heating up to the required tempering temperature. After that, the tempering process is completed by cooling the inner shaft 21 over a predetermined time.

According to the high frequency induction heating coil body 20 having the above-described configuration, the outer circumferential surface is formed by the action of linear first to fourth heating conductors 22 to 25 arranged in parallel with the outer circumferential surface 21a of the inner shaft 21. Induced current parallel to the axis of the inner shaft 21 flows in the 21a, and as a result, the whole of the outer circumferential surface 21a (that is, the whole of the surface to be processed) can be uniformly heated. Good tempering quality can be obtained.

Here, a description will be given of the fact that the entire processed surface can be uniformly heated by flowing an induced current parallel to the axis of the heated object (inner shaft 21) to the surface to be processed (outer peripheral surface 21a). That is, when the induction current is flowed in the circumferential direction (four places in this embodiment) parallel to the axis of the workpiece using the present coil body 20, the coil body 20 always has a heated surface. There is no reason for heating, and what heats up in the circumferential direction of a to-be-heated surface is the part (four places) which face each other to the 1st-4th heating conductors 22-25, respectively. At this time, since the to-be-heated object is rotating, until the area | region heated up by the 1st-4th heating conductors 22-25 faces each other with these 1st-4th heating conductors 22-25 at the next time point, It is left to cool, and as the heat moves from the high temperature part to the low part, the whole becomes close to a constant temperature. By repeating such a state (in other words, by alternately heating and dissipating each other), after a predetermined time (for example, about 15 seconds), the entire surface to be heated becomes almost uniform. After a certain period of time (for example, about 120 seconds), the crack is completely cracked.

By the way, in the high-frequency tempering treatment, heating is also generally important, but it is also important to thermally move the inside of the workpiece by using the cooling time after the heating, and if the thermal movement is insufficient, after the hardness near the surface decreases, Once the hardness rises (exactly, the hardness does not fall when tempering but remains the same when quenched), and then the hardness goes down again. However, according to this coil body 20, such a case does not arise and it is possible to perform a tempering process so that hardness may fall from the surface of a to-be-heated object toward an inside.

Further, according to the coil body 20, by appropriately adjusting the distance (distance) between the outer circumferential surface 21a (ie, the surface to be heated) and the first to fourth heating conductors 22 to 25, or the high frequency magnetic field, By mounting the magnetic material 32 which can adjust magnetic flux density to the 1st-4th heating conductors 22-25, it is possible to arbitrarily adjust the temperature distribution in the said outer peripheral surface 21a. In particular, since the distance between the linear first to fourth heating conductors 22 to 25 and the surface to be heated is different at several places in the axial direction of the object to be heated, the difference in the heating temperature of the surface to be heated is more than acceptable. Is produced, the temperature rise amount is uniformed by attaching a magnetic material 32 such as a silicon steel sheet to a portion of the first to fourth heating conductors 22 to 25 facing each other in a region where the temperature rise is small. Can be heated.

In addition, the configuration of the coil body 20 is simple and inexpensive, and in the case where the number of tempering parts increases, a special high frequency induction heating coil body 20 for that type is prepared and tempered under optimum heating conditions for each part. In this process, it is easy to control the quality of heat treatment for multiple models and the weight of the high frequency induction heating coil body 20 is very light compared to the conventional one (in addition, about 2 kg). Preparation time can be shortened. In addition, by using the first and second connection conductors 26 and 27 having a rounded ring shape, the high frequency induction heating coil body 20 can be easily manufactured, and the high frequency induction heating coil body 20 is made of high strength. can do.

Below, the specific example at the time of tempering process using the high frequency induction heating coil body 20 which concerns on Example 1 of this invention is shown.

Embodiment

(1) Tempering parts: Internal shaft of hub unit

  (a) Material: S53C

  (b) Overall length: 84.5mm

  (c) Shaft diameter: 20 ~ 26mm

  (d) Flange diameter: 135mm

(2) high frequency tempering condition

   (a) Frequency: 2.5 ㎑

   (b) Output: 26㎾

   (c) heating time; 15 sec

   (d) Cooling time: 120sec

When the tempering treatment was performed under the above conditions, it was confirmed that the hardened layer formed on the outer circumferential surface of the inner shaft had a low hardness from the outermost surface to the boundary line of the inner base material, and was sufficiently tempered.

3 shows a modification of the high frequency induction heating coil body 20, and the high frequency induction heating coil body 20 'according to the modification shows the conductor portions α, β, and second of the first connection conductor 26. As shown in FIG. A cutout is provided in a part of the conductor portion γ of the connecting conductor 27, and the insulating plates 35, 36, and 37 are disposed in these cutouts, respectively. In addition, the structure other than the insulation plates 35, 36, 37 is the same as that of the high frequency induction heating coil body 20 mentioned above. 4 shows another modified example of the high frequency induction heating coil body 20, and the high frequency induction heating coil body 20 "according to the modified example shows the conductor portions α, β, and the second connecting conductor of the first connecting conductor 26. FIG. All of the conductor portion γ of 27 is cut off. The other configuration of the high frequency induction heating coil body 20 ″ is similar to that of the high frequency induction heating coil body 20 described above. These high frequency induction heating coil bodies 20 'and 20 "can be used in place of the high frequency induction heating coil bodies 20 described above, and can exhibit the same operational effects as in the case of the high frequency induction heating coil bodies 20 described above.

5 shows the high frequency induction heating coil body 40 according to the second embodiment of the present invention, wherein the high frequency induction heating coil body 40 is the outer ring of the hub unit (quench, 41, see FIG. 6) after the quenching treatment. The inner circumferential surface 41a is used for high frequency induction heating for tempering treatment. As shown in FIG. 5, the high frequency induction heating coil body 40 of the present embodiment is a structure formed by connecting a conductive pipe material having a rectangular cross section to form a predetermined shape, for example. The first to fourth heating conductors 42, 43, 44, 45, and the first to fourth linear conductors, which are arranged in parallel to the axial direction and are disposed to face the inner circumferential surface 41a of the outer ring 41, respectively. Round first annular conductor 46 to which one end of the heating conductors 42 to 45 of FIG. 4 (lower end in FIG. 5) is connected, and first to fourth heating not connected to the first interconnection conductor 46. The other end of the conductors 42 to 45, i.e., the other end opposite to the one end (the upper end in Fig. 5), respectively, and the inner side of the first connecting conductor 46 with respect to the first to fourth heating conductors 42 to 45, respectively. Fold almost 90 degrees towards The second to fifth connecting conductors 47, 48, 49 and 50, the first lead portion 51 for electric supply connected to the distal end of the second and third connecting conductors 47 and 48, and the fourth and fifth It consists of the 2nd electrical supply lead part 52 connected to the front-end | tip part of 5 connection conductors 49 and 50. As shown in FIG. In this embodiment, the lower end portions of the heating conductors 42 to 45 are connected to the upper surface portion of the first connecting conductor 46, and the outer circumferential surface of the first connecting conductor 46 and the first to fourth heating conductors 42 are also connected. 45 outer surface is arrange | positioned on the same cylindrical surface.

In this way, when a high frequency current is supplied from the high frequency power supply 53 to the high frequency induction heating coil body via the first and second electrical supply leads 51 and 52, as described later, FIG. It is comprised so that a high frequency current may flow through the current path | route shown by the arrow S in 1st. In the above case, the conductor portion α 'between the first and second heating conductors 42 and 43 and the conductor portion β' between the third and fourth heating conductors 44 and 45 are also shown in the first connection conductor 46. Since the high frequency voltages are configured to have the same phase of the same dynamic potential at both ends, the high frequency currents do not flow through these conductor portions α 'and β'.

On the other hand, the front end portions of the second to fifth connection conductors 47 and the first and second electrical supply leads 30 and 31 are arranged to face each other in a parallel shape with a small gap therebetween. Although illustration is abbreviate | omitted, the insulating board is interposed between them. Further, the first to fourth heating conductors 42 to 45, the first to fifth connecting conductors 46 to 50, the first and second electrical supply leads 51 and 52 each made of a conductive pipe material, respectively. The coolant supplied from the coolant supply mechanism other than the figure flows in the hollow part of the hollow). In addition, in the high frequency induction heating coil body 40 of the present embodiment, as shown in FIG. 6, the magnetic material 54 for magnetic flux concentration in the portion except the outer side of the first to fourth heating conductors 42 to 45. Are installed respectively.

Here, the procedure for the high frequency induction heating of the inner circumferential surface 41a of the outer ring 41 for the tempering treatment using the high frequency induction heating coil body 40 described above will be described as follows. First, the outer ring 41, which is a tempering object part, is fixed with a work support jig other than the drawing, and the high frequency induction heating coil body 40 is moved downward, for example, by a lifting mechanism other than the drawing, and the axis of the outer ring 41 as shown in FIG. And the axis of the high frequency induction heating coil body 40 (center line of the first connecting conductor 46). As a result, the first to fourth heating conductors 42 to 45 of the high frequency induction heating coil body 40 are arranged to face each other in parallel with a predetermined interval with respect to the inner circumferential surface 41a of the outer ring 41. Thereafter, a high frequency current is supplied from the high frequency power supply 53 to the high frequency induction heating coil body 40 via the first and second electrical supply leads 51 and 52, and the outer ring 41 is shown in the drawing. It is driven to rotate about its axis along with other work support jig.

In this case, as the high frequency induction heating coil body 40 is supplied with high frequency power, the high frequency induction heating coil body 40 flows a high frequency current along a path shown by the arrow S in FIG. High-frequency currents flow with each other along a path opposite to the arrow S direction. Specifically, the high frequency current in the case shown in FIG. 5 includes a high frequency power source 53, a first electric supply lead 51, a second connection conductor 47, a first heating conductor 42, and a first connection. Flows through the conductor portion G (conductor portion between the portions α 'and β') of the conductor 46, the fourth heating conductor 45, the fifth connecting conductor 50, and the second lead portion 52 for electric supply. Simultaneously, the conductor portion H of the high frequency power source 53, the first lead portion 51 for supplying electricity, the third connecting conductor 48, the second heating conductor 43, and the first connecting conductor 46 (the conductor portion G is the same). The conductor part facing each other), the third heating conductor 44, the fourth connecting conductor 49 and the second lead portion 52 for supplying electricity. In this way, the inner circumferential surface 41a of the outer ring 41 in the rotational driving state is required by the induction action of the high frequency current flowing through the first to fourth heating conductors 22 to 25 disposed to face the inner circumferential surface 41a. The high frequency induction is also uniformly heated up to the tempering temperature. After that, the tempering process is completed by cooling the outer ring 41 over a predetermined time.

According to the high frequency induction heating coil body 40 having the above-described configuration, the inner circumferential surface is formed by the action of the linear first to fourth heating conductors 42 to 45 arranged in parallel with the inner circumferential surface 41a of the outer ring 41. Induction current parallel to the axis of the outer ring 41 flows to the 41a, and as a result, the whole of the inner circumferential surface 41a (i.e., the entire surface to be heated) can be heated up uniformly. Good tempering quality can be obtained. Furthermore, the magnetic flux density of the high frequency magnetic field can be adjusted by appropriately adjusting the distance (distance) between the inner circumferential surface 41a (ie, the heated surface) and the first to fourth heating conductors 42 to 45. By attaching the material 54 to the first to fourth heating conductors 42 to 45, it is possible to arbitrarily adjust the temperature distribution on the inner circumferential surface 41a. In addition, since the configuration of the high frequency induction heating coil body 40 is simple and inexpensive, when the types of tempering parts are increased, the high frequency induction heating coil body for the above types is prepared, and the tempering treatment is performed under the appropriate heating conditions for each component. Since it is possible to easily perform heat treatment quality control over multiple models, and the weight of the high frequency induction heating coil body 40 is extremely light (that is, about 2 kg) compared to the conventional one, The preparation time for the work can be shortened. By using the first ring-shaped first connecting conductor 46, the high frequency induction heating coil body 40 can be easily manufactured, and the high frequency induction heating coil body 20 can be formed with high strength.

Below, the specific example at the time of tempering process using the high frequency induction heating coil body 40 which concerns on Example 2 of this invention is shown.

Embodiment

(1) Tempering parts: Outer ring of hub unit

  (a) Material: S53c

  (b) Height: 55.8mm

  (c) Minimum inner diameter: 51mm

  (d) Ball groove diameter: 61.5mm

(4) high frequency tempering condition

  (a) Frequency: 2.5 ㎑

  (b) Output: 20㎾

  (c) Heating time: 15 sec

  (d) Cooling time: 120sec

When tempering was performed under the above conditions, it was confirmed that the hardened layer formed on the outer circumferential surface of the inner shaft had a low hardness from the most surface to the boundary line of the inner base material, and was sufficiently tampered.

7 shows a modification of the high frequency induction heating coil body 40, and the high frequency induction heating coil body 40 'according to the modification is formed on a part of the conductor portions α' and β 'of the first connecting conductor 46. As shown in FIG. The cut portions were provided so that the insulating plates 55 and 56 were disposed in these cut portions, respectively. In addition, the structure other than the insulation plates 55 and 56 is the same as that of the high frequency induction heating coil body 40 mentioned above. 8 shows another modified example of the high frequency induction heating coil body 40, and the high frequency induction heating coil body 40 "according to the above modification includes all of the conductor portions α 'and β' of the first connecting conductor 46. As shown in FIG. The other structure of the high frequency induction heating coil body 40 "is the same as that of the high frequency induction heating coil body 20 mentioned above. These high frequency induction heating coil bodies 40 'and 40 "can be used in place of the high frequency induction heating coil bodies 40 described above, and can exhibit the same operational effects as in the case of the high frequency induction heating coil bodies 40 described above.

As mentioned above, although the Example of this invention was described, this invention is not limited to the Example mentioned above, A various deformation | transformation and a change are possible based on the technical idea of this invention. For example, the first and second connection conductors 26, 27 or the first connection conductors 46 do not necessarily have to have a circular ring shape or an arc shape, and the first to fourth heating conductors 22 to 25 adjacent to each other. Alternatively, 42 to 45 may be connected by a straight connection conductor. In addition, the number of heating conductors can be increased or decreased (but two or more) as needed, without being limited to four. In addition, the high frequency induction heating coil bodies 20 and 40 according to the present invention are not limited to the case where the inner shaft 21 or the outer ring 41 of the hub unit is a heating target, and a plurality of different diameter portions are provided on the outer peripheral surface or the inner peripheral surface. Branches can be subjected to heating of various parts.

In addition, in the above-described embodiments and modifications, the high frequency induction heating coil body for tempering has been described, but it is not limited to this, and it is necessary to say that the present invention can be applied to the high frequency induction heating coil body for quenching. There is no.

As described above, according to the present invention, the outer circumferential surface of the axial member having a plurality of outer diameters of different diameters, or the inner circumferential surface of the cylindrical members having different diameter inner circumferences, is applied to the high frequency induction heating coil body. In

The heating target is not affected by the shape of the component to be heated, and the heating target is changed during the heating by changing the distance (distance) between the heating conductor of the high frequency induction heating coil body and the surface to be heated of the component to be heated or by mounting a magnetic material. There is an effect that can easily adjust the surface temperature distribution of the hardened hardened layer of the component and its peripheral region.

In addition, since the total weight of the heating apparatus including the high frequency induction heating coil body is extremely light, when the type of the heating target component is increased, a heating apparatus for the above type is prepared, and the heating treatment can be performed under the appropriate heating conditions for each component. And easy heat treatment quality control over various kinds

Moreover, according to this invention, since three or more linear heating conductors were provided, it can heat uniformly to a sufficient grade.

In addition, according to the present invention, the connecting conductor to which one end of the plurality of heating conductors is connected can be formed in a rounded ring, arc shape, or straight shape to improve the degree of freedom in designing the high frequency induction heating coil body. In the case of using a connected conductor, the strength of the high frequency induction heating coil body can be secured sufficiently and the production of the high frequency induction heating coil body can be facilitated.

Claims (5)

High frequency induction heating coil body for high frequency induction heating of the outer circumferential surface of a axial member having a plurality of different diameter outer circumferences or the inner circumferential surface of a cylindrical member having different diameter inner circumferences To (a) 4 having straight portions disposed in parallel to the axial direction of the axial member or the cylindrical member and disposed opposite to each other on the outer circumferential surface of the axial member or the inner circumferential surface of the cylindrical member; First, second, third, and fourth heating conductors (22, 23, 24, 25), (b) a first ring-shaped first connecting conductor to which one ends of the four first, second, third, and fourth heating conductors 22, 23, 24, and 25 are respectively connected; 26), (c) one of the electrical supply leads 30 of the pair of electrical supply leads 30, 31 connected to the high frequency power source, and the four first, second, third, and fourth A second ring-shaped second connecting conductor 27 for connecting the other ends of the two first and second heating conductors 22 and 23 of the heating conductors 22, 23, 24 and 25, respectively, (d) the other electrical supply lead portion 31 of the pair of electrical supply leads 30 and 31 and the four first, second, third and fourth heating conductors ( An arc-shaped third connecting conductor 28 for connecting two third and fourth heating conductors 24 and 25 of 22, 23, 24 and 25, respectively, High frequency induction heating coil body, characterized in that provided with each. delete delete The method of claim 1, The connecting portion of one end of the first connecting conductor 26 and the first and second heating conductors 22 and 23, and the second connecting conductor 27 and the first and second heating conductors 22 and 23. In the connecting portion of the other end of the circuit), the high frequency voltage is in phase and coincidence, and at the connecting portion of the first connecting conductor 26 and one end of the third and fourth heating conductors 24 and 25, The connecting conductor portion α between one end of the first and second heating conductors 22 and 23 in the round-shaped first connecting conductor 26 is constituted such that the high frequency voltage is in phase and coin-operated. ), A connecting conductor portion β between one end of the third and fourth heating conductors 24 and 25 of the first ring-shaped first connecting conductor 26, and the second ring-shaped second connecting conductor The high frequency current does not flow in the connection conductor portion γ between the other ends of the first and second heating conductors 22 and 23 in (27). High frequency induction heating coil body, characterized in that. The method of claim 1, Connection conductor part (alpha) between one end part of the said 1st and 2nd heating conductors 22 and 23 among the said round ring-shaped 1st connection conductors 26, The said 1st ring-shaped 1st connection conductor 26 Among the connecting conductor portions β between one ends of the third and fourth heating conductors 24 and 25, and the first and second heating conductors of the second connecting conductor 27 having a round shape ( The first ring-shaped first connecting conductor 26 is formed by providing cutout portions in the connecting conductor portions γ between the other ends of 22 and 23, respectively, and arranging the insulating plates 35, 36 and 37 in these cut portions. Of the first and second heating conductors 22 and 23, and the third and fourth heating conductors 24 of the rounded first connection conductor 26. Connecting portion (β) between one end of the first and second ends, and the connecting conductor between the other end of the first and second heating conductors (22, 23) of the second ring-shaped second connecting conductor (27) Go to the part (γ) A high frequency induction heating coil body characterized in that the frequency current does not flow.

Images