JPH0585841U - Induction hardening equipment - Google Patents

Abstract

(57) [Summary] [Purpose] When quenching a track roller 80 having distant first and second hardened surfaces 810 and 820, cooling liquid is applied to these first and second hardened surfaces 810 and 820. It is not necessary to move the jacket for injecting, and after the first hardened surface 810 is hardened, the track roller 80 does not have to be left / right reversed.
The second hardened surface 820 can be hardened. [Structure] An induction hardening apparatus includes a first heating coil 10 for heating a first hardened surface 810, a second heating coil 20 for heating a second hardened surface 820, and a space between both hardened surfaces. A jacket 30 for jetting the cooling liquid provided is provided, and the jacket 30 has a first cooling liquid jet hole 35 for jetting the cooling liquid L onto the first surface to be hardened 810,
The first cooling liquid passage 31 that is in communication with the first cooling liquid injection hole 35 and the second cooling liquid injection hole that injects the cooling liquid L onto the second surface to be hardened 820.
36 and the second coolant injection hole 36 and the first coolant passage
31 and a second cooling liquid passage 32 separated by a partition wall 33.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an induction hardening apparatus for a work having two hardened surfaces separated from each other.

[0002]

[Prior Art]

 Hereinafter, a conventional technique will be described with reference to the drawings. For example, a case will be described in which the hardened layers 803 and 804 are formed on a stepped columnar track roller (used in a traveling system of a bulldozer) 80 whose longitudinal section is shown in FIG. The track roller 80 is a rotationally symmetrical body having a shaft 802 as a rotation axis, and has a pair of large diameter portions 814, 824, a pair of medium diameter portions 812, 822, and a small diameter portion from both ends in the axial direction toward the center. A portion 801 is formed. A tapered portion 811 is formed between the small diameter portion 801 and the medium diameter portion 812, and an R portion 813 is formed between the medium diameter portion 812 and the large diameter portion 814. Further, a taper portion 821 is formed between the small diameter portion 801 and the medium diameter portion 822, and an R portion 823 is formed between the medium diameter portion 822 and the large diameter portion 824.

Then, a hardened layer 803 is formed on the first hardened surface 810, which is a surface extending over the tapered portion 811, the medium diameter portion 812, and the R portion 813, and the tapered portion 821, the medium diameter portion 822, and the R portion 813 are formed. The hardened layer 804 is formed on the second hardened surface 820 which is the surface over the portion 823.

In order to form such hardened layers 803 and 804 on the track roller 80, conventionally, the following means have been taken. That is, first, a semi-open saddle type high frequency heating coil (hereinafter, the high frequency heating coil is simply referred to as a heating coil) 10 shown in FIG. 11 is prepared.

The heating coil 10 includes power supply conductors 101, 102 and a coil piece 10A and a coil piece 10B connected in series between the conductors 101, 102. The coil piece 10A is arranged so as to closely face the R portion 813 of the track roller 80 and the heating conductor 11 which faces the vicinity of the taper portion 811 of the medium diameter portion 812. Parallel to the heating conductor 12, the heating conductor 13 arranged in the direction of the axis 802 of the track roller 80, that is, the direction of the arrow P, and connecting the one ends of the heating conductors 11 and 12, and arranged in the direction of the arrow P. And a heating conductor 14 connected to the other end of the heating conductor 12. Each of the heating conductors 11 and 12 has an approximately 1/4 arc shape and is formed in the circumferential direction of the track roller 80, that is, in the direction of arrow Q.

As shown in the sectional shape of FIG. 12, the heating conductor 11 has an R-portion facing surface 11a having a curved cross-section corresponding to the R-portion 813, and the surfaces other than this R-portion facing surface 11a are A magnetic core 11b is attached so as to cover it. Further, the heating conductor 12 has a square or rectangular cross section, and the core 12b is attached so as to cover the surfaces except the intermediate diameter portion facing surface 12a facing the intermediate diameter portion 812. The cross-sectional shape of the heating conductors 13 and 14 is almost the same as that of the heating conductor 12, and a core is attached. In addition, 103 is a hollow portion of the heating conductors 11 and 12, and these hollow portions are flow passages for the cooling liquid of the heating coil 10.

The coil piece 10 B has the same structure as the coil piece 10 A, that is, it has the same heating conductors 15 to 18 as the heating conductors 11 to 14, and the heating conductor 17 is arranged so as to face the heating conductor 13. It is set up. Then, as shown in FIG. 13, the heating conductor 15 is formed with an R portion facing surface 15a and a core 15b is mounted. The heating conductor 16 is formed with a medium-diameter portion facing surface 16a, and a core 16b is mounted. The heating conductor 14 and the heating conductor 18 are connected by a connection conductor 19.

Next, as shown in FIG. 14, both ends of a horizontally arranged track roller 80 are supported by centers 91 and 92, and the track roller 80 is rotated about a shaft 802 by a rotation driving device (not shown). However, the heating coil 10 is disposed close to the medium diameter portion 812 of the track roller 80, the heating conductor 11 is disposed in the R portion 813, and the heating conductor 12 is disposed in the vicinity of the tapered portion 811 of the medium diameter portion 812. To do. After that, a high-frequency current is applied to the heating coil 10 for a predetermined time, and then the heating coil 10 is raised by a heating coil lifting device (not shown). Next, in order to inject the cooling liquid to the track rollers 80, an annular jacket 60 having a large number of cooling liquid injection holes 61 on its inner surface is moved in the direction of arrow S and arranged so as to face the intermediate diameter portion 812. Then, when the cooling liquid is injected from the cooling liquid injection hole 61 to the track roller 80, the hardened layer 803 is formed to extend over the tapered portion 811, the medium diameter portion 812, and the R portion 813. Then, the jacket 60 is moved in the direction opposite to the arrow S and returned to the original position.

Next, the support of the track roller 80 by the centers 91 and 92 is released, the track rollers 80 are arranged in the left-right direction, and then the track rollers 80 are horizontally supported again by the centers 91 and 92. Then, similarly to the case where the hardened layer 803 is formed on the tapered portion 811, the medium diameter portion 812, and the R portion 813, the heating coil 10 and the jacket 60 are used, and the tapered portion 821, the medium diameter portion 822, and the R portion 813 are formed. The hardened layer 804 is formed on the portion 823, and the quenching of the track roller 80 is completed.

[0010]

[Problems to be solved by the device]

 When the hardened layers 803 and 804 are formed on the track roller 80 as described above, there are the following problems. That is, first, when forming the hardened layers 803 and 804, a device for moving the jacket 60 to a position facing the surface to be hardened each time and returning to the original position is required. The structure of the input device becomes complicated. In addition, after forming the hardened layer 803, in order to form the hardened layer 804, the track rollers must be relocated to the left and right. Therefore, it takes time to change this position.

The present invention has been made in view of the above circumstances, and when quenching a work having two first and second hardened surfaces that are separated from each other, cooling is performed on the hardened surface. It is not necessary to move the jacket that injects the liquid, and after quenching one surface to be quenched, it is possible to quench the next surface to be quenched without repositioning the work piece to the left and right. The purpose is to provide a quenching device.

[0012]

In order to solve the above-mentioned problems, an induction hardening apparatus of the present invention includes a first hardened surface of a work and a second hardened surface that is distant from the first hardened surface. In an induction hardening apparatus for hardening a hardened surface, a first high-frequency heating coil for heating a first hardened surface, a second high-frequency heating coil for heating a second hardened surface, and both hardened materials A jacket for jetting a cooling liquid provided between the entrance surfaces, wherein the jacket is provided with a first cooling liquid injection hole for injecting the cooling liquid on the first surface to be hardened, and a first cooling liquid injection hole. A first cooling liquid passage that is in conduction, a second cooling liquid injection hole that injects the cooling liquid onto the second hardened surface, and a second cooling liquid passage that is in communication with the second cooling liquid injection hole and is isolated from the first cooling liquid passage. And a cooling liquid passage.

[0013]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 to 10 are drawings for explaining the present embodiment, FIG. 1 is an explanatory view of a state in which a track roller is being cooled, and FIG. 2 is an explanatory diagram of a state in which the track roller is being subjected to high-frequency heating. 3 is a front view of the jacket, FIG. 4 is a sectional view taken along the line AA of FIG. 3, FIG. 5 is a schematic perspective view of the heating coil, FIG. 6 is a sectional view taken along the line BB of FIG. 5 is a cross-sectional view taken along the line C-C in FIG. 5, FIG. 8 is an explanatory view of a case where two hardened surfaces of the track roller are being cooled at the same time, and FIG. 9 is heating two points of the track roller at the same time. FIG. 10 is a schematic perspective view of a heating coil that simultaneously heats two surfaces to be hardened. It should be noted that the same components as those described in the related art are designated by the same reference numerals. As a workpiece to be quenched by the induction hardening apparatus of this embodiment, the same track roller 80 as described in the conventional induction hardening apparatus is adopted.

The induction hardening apparatus of the present embodiment is the first heating for heating the first hardened surface 810 which is the surface of the taper portion 811 of the track roller 80, the medium diameter portion 812 and the R portion 813. The coil 10, the second heating coil 20 for heating the second hardened surface 820 which is the surface of the tapered portion 821, the medium diameter portion 822, and the R portion 823, the first hardened surface 810, and the second hardened surface 810. The basic configuration is to include a cooling liquid jetting jacket 30 provided between the quenching surface 820 and the quenching surface 820.

More specifically, as shown in FIG. 5, the heating coil 10 has the same structure as the heating coil 10 described in the related art. When viewed schematically, the heating coil 20 has a structure substantially similar to that of the heating coil 10, and the power supply conductors 201, 202 and 202 corresponding to the power supply conductors 101, 102 and the coil pieces 10A, 10B of the heating coil 10, respectively. And coil pieces 20A and 20B.

The coil piece 20A has heating conductors 21 to 24 at positions corresponding to the heating conductors 11 to 14 of the coil piece 10A, respectively. As shown in FIG. The conductor 22 has the same cross-sectional shape as the heating conductor 11. That is, the heating conductor 22 has the R portion facing surface 22a so that the R portion 823 of the second hardened surface 820 can be heated, and the core 22b is mounted, and the heating conductor 21 is the second hardened surface. The quenching surface 820 has a medium diameter portion corresponding surface 21a and a core 21b mounted so that the vicinity of the taper portion 821 of the medium diameter portion 822 can be heated.

The coil piece 20B has the same structure as the coil piece 20A and has heating conductors 21 to 24 and the same heating conductors 25 to 28, respectively, and the heating conductor 27 is arranged so as to face the heating conductor 23. It is set up. Then, as shown in FIG. 7, the heating conductor 26 is formed with an R portion facing surface 26a and a core 26b is mounted. The heating conductor 25 is formed with a medium-diameter portion facing surface 25a, and a core 25b is mounted. The heating conductor 24 and the heating conductor 28 are connected by a connection conductor 29.

As shown in FIG. 5, the power supply conductors 101 and 102 are connected to the secondary side output terminal 501 of the transformer 50 through a pair of contacts 41 and 41 which are respectively moved forward and backward by a pair of cylinders 42 and 42. , 502 is connected. Further, the power supply conductors 201 and 202 are also connected to the secondary side of the transformer 50 via a pair of contacts 43 and 43, which are respectively advanced and retracted by a pair of cylinders 44 and 44. Reference numeral 51 is a high frequency power supply, which supplies a high frequency current to the primary side of the transformer 50. Reference numeral 45 is a first heating coil elevating device for elevating the first heating coil 10, and 46 is a second heating coil elevating device for elevating the second heating coil 20.

As shown in FIG. 3, the jacket 30 is formed in a U shape, and as shown in FIG. 4, a plurality of first cooling liquid injection holes for injecting the cooling liquid to the first hardened surface 810. 35, the first cooling liquid passage 31 communicating with the first cooling liquid injection hole 35, the second cooling liquid injection hole 36 for injecting the cooling liquid to the second hardened surface 820, and the second cooling liquid injection hole It is provided with a first cooling liquid passage 31 and a second cooling liquid passage 32 which are separated from each other by a partition wall 33 and communicate with 36. 37 and 38 are couplers to which pipes (not shown) for supplying the cooling liquid to the first cooling liquid passage 31 and the second cooling liquid passage 32 are connected, respectively.

Next, the operation of this embodiment will be described. As shown in FIG. 2, both ends of a horizontally arranged track roller 80 are supported by centers 91 and 92, and the track roller 80 is rotated about a shaft 802 by a rotation driving device (not shown) while the first heating coil is rotated. The first heating coil 10 is lowered by the lifting device 45 to be arranged close to the first hardened surface 810, and then the cylinder 42 is operated to move the contacts 41, 41 forward so that the contact 41, 41 causes the transposition. The 50 and the first heating coil 10 are connected.

Then, a high frequency current is supplied to the first heating coil 10 from the high frequency power supply 51 for a predetermined time through the transformer 50. Next, the cylinders 42, 42 are operated to retract the contacts 41, 41 to disconnect the transformer 50 from the first heating coil 10, and then the first heating coil elevating device 45 is used to move the contact 50 as shown in FIG. After raising the first heating coil 10, the cooling liquid is supplied to the first cooling liquid passage 31 of the jacket 30, and the cooling liquid L is injected from the first cooling liquid injection hole 35 to the first hardened surface 810. Then, the hardened layer 803 is formed on the first hardened surface 810 by cooling.

Then, similarly to the case of quenching the first hardened surface 810, the cylinder 44 is operated, and the transformer 50 and the second heating coil 20 are connected by the contacts 43, 43 to perform the second heating. After the second hardened surface 820 is heated by the coil 20, the cooling liquid is supplied to the second cooling liquid passage 32 of the jacket 30, and the cooling liquid L is supplied to the second hardened surface 820 from the second cooling liquid injection hole 36. By injecting and cooling, the hardened layer 804 is formed on the second hardened surface 820. In this way, the first hardened surface 810 and the second hardened surface 820 are hardened separately so that the capacity of the transformer 50 and the high-frequency power supply 51 is reduced in order to reduce the equipment of the induction hardening apparatus. Because it is small.

As described above, in this embodiment, after the first hardened surface 810 is quenched, it is not necessary to change the left and right positions of the track roller 80, and it is not necessary to move the jacket 30.

If the high-frequency power source 51 has a sufficient capacity, the first hardened surface 810 and the second hardened surface 820 can be simultaneously hardened. That is, the power supply conductor 102 of the heating coil 10 shown in FIG. 5 is divided into power supply conductors 102 and 103 as shown in FIG. 10, and the power supply conductor 102 is connected to the power supply conductor of the heating coil 20 by the connecting conductor 52. 20 1 is connected and fixed, and the power supply conductor 202 is connected and fixed to the power supply conductor 10 3 by the connection conductor 53 so that the first heating coil 10 and the second heating coil 20 are electrically connected in series. Mechanically integrated. Reference numeral 47 is a coil elevating device for elevating the first and second heating coils 10 and 20 which are integrally connected as described above.

Then, as shown in FIG. 9, the track roller 80 is supported by the centers 91 and 92, and while being rotated about the shaft 802, the first heating coil 10 coupled to the first heating coil 10 by the coil elevating device 47. The second heating coil 20 is lowered and arranged so as to approach and face the first hardened surface 810 and the second hardened surface 820, respectively, and then the contacts 41, 41 are advanced by the cylinder 42. The first heating coil 10 and the second heating coil 20 are connected to the transformer 50 to heat the first and second hardened surfaces 810, 820 for a predetermined time.

Thereafter, the first heating coil 10 and the second heating coil 20 are raised, and then the cooling liquid is supplied to the first and second cooling liquid passages 31 and 32 of the jacket 30 as shown in FIG. By injecting the cooling liquid L from the first cooling liquid injection hole 35 to the first hardened surface 810 and from the second cooling liquid injection hole 36 to the second hardened surface 820, respectively. 803 and hardened layer 804 are formed. In this case, of course, it is not necessary to move the jacket 30, but since the first hardened surface 810 and the second hardened surface 820 can be simultaneously hardened, the hardening process can be shortened. There is.

[0027]

[Effect of the device]

 As described above, the induction hardening apparatus of the present invention includes the first heating coil for heating the first hardened surface of the workpiece and the second hardened surface distant from the first hardened surface. A jacket for injecting a cooling liquid is provided between the second heating coil for heating the first cooling liquid, and this jacket has a first cooling liquid injection hole for injecting the cooling liquid on the first hardened surface and a first cooling liquid injection hole. A first cooling liquid passage that is in communication with the liquid injection hole, a second cooling liquid injection hole that injects the cooling liquid onto the second surface to be hardened, and a first cooling liquid passage that is in communication with the second cooling liquid injection hole And an isolated second cooling liquid passage.

That is, in the induction hardening apparatus of the present invention, the cooling liquid can be sprayed from the jacket to either the first hardened surface or the second hardened surface. It is not necessary to move the jacket, and the second heating coil for heating the second hardened surface is provided separately from the first heating coil for heating the first hardened surface. The quenching process can be shortened because there is no need to reposition the workpiece after quenching the quenching surface.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a state where a first hardened surface of a track roller is being cooled by an induction hardening apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a state where the first hardened surface of the track roller is being heated by high frequency.

FIG. 3 is a front view of the jacket of the induction hardening apparatus according to the embodiment of the present invention.

4 is a sectional view taken along the line AA of FIG.

FIG. 5 is a schematic perspective view of a heating coil of an induction hardening apparatus according to an embodiment of the present invention.

6 is a cross-sectional view taken along the line BB of FIG.

7 is a cross-sectional view taken along the line CC of FIG.

FIG. 8 is an explanatory view showing a state where the first and second hardened surfaces of the track roller are simultaneously cooled by the induction hardening apparatus according to another embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a state where the first and second hardened surfaces of the track roller are being heated simultaneously.

FIG. 10 is a schematic perspective view of a heating coil for simultaneously heating the first and second hardened surfaces.

FIG. 11 is a schematic perspective view of a heating coil of a conventional induction hardening apparatus.

12 is a cross-sectional view taken along the line DD of FIG.

13 is a cross-sectional view taken along the line EE of FIG.

FIG. 14 is an explanatory diagram showing a state where a track roller is being heated by a conventional induction hardening apparatus.

[Explanation of symbols]

 10 1st heating coil 20 2nd heating coil 30 Jacket 31 1st cooling liquid passage 32 2nd cooling liquid passage 35 1st cooling liquid injection hole 36 2nd cooling liquid injection hole 810 1st quenching surface 820 2nd quenching Entrance

Claims (1)

[Scope of utility model registration request] 1. An induction hardening apparatus for quenching a first hardened surface of a work and a second hardened surface distant from the first hardened surface, wherein the first hardened surface is A first high frequency heating coil for heating and a second
A second high-frequency heating coil for heating the surface to be hardened; and a jacket for injecting a cooling liquid provided between the surfaces to be hardened, the jacket for injecting the cooling liquid on the first surface to be hardened. A first cooling liquid injection hole, a first cooling liquid passage communicating with the first cooling liquid injection hole, and a second cooling liquid injection hole for injecting the cooling liquid on the second hardened surface.
An induction hardening apparatus comprising: a cooling liquid injection hole; and a second cooling liquid passage that is connected to the second cooling liquid injection hole and is separated from the first cooling liquid passage.