JP2623401B2 - Surface hardening equipment for long workpieces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface hardening apparatus for a long work, which uses both high-frequency induction heating and direct current heating.

[0002]

2. Description of the Related Art As a method for quenching the side of a long work such as a long rail having a rectangular cross section, there is an induction hardening using both induction heating and direct electric heating. FIG. 4 shows a conventional hardening apparatus used for the induction hardening.

The conventional quenching apparatus has a rectangular tubular induction coil 90 supported horizontally on a base 91. The induction coil 90 also serves as a cooling jacket, and has a large number of quenching liquid ejection holes 92 on the upper surface. A first contact 93 protruding upward is provided at one end of the induction coil 90, and a lead 94 is connected to the other end. Induction coil 9
0, a second contact 95 is arranged on the other end side.
A lead 96 is also connected to the contact 95 from below.

The long workpiece W to be quenched includes a contact 93,
It is placed on the contacts 93 and 95 over the contact 95, and is pressed down from above the contacts 93 and 95 by the work holder, and the lower surfaces at both ends are pressed against the contacts 93 and 95. When the high-frequency power supply connected to the leads 94 and 96 is operated,
A high-frequency current flows through the induction coil 90 to the lower surface layer of the long work W, and the surface layer is directly energized and heated.
Further, the high-frequency current flowing through the induction coil 90 generates an induced current in the lower surface layer of the long work W, and the lower surface layer of the long work W is also heated by the induced current.

When the lower surface layer of the long workpiece W is heated to a predetermined quenching temperature, a quenching liquid is introduced into the induction coil 90. Thereby, the quenching liquid is ejected upward from the quenching liquid ejection hole 92 of the induction coil 90, and the lower surface layer portion of the long work W is rapidly cooled to have a predetermined quenched structure.

[0006]

In such a surface hardening device for a long work W, the surface to be hardened of the long work W is heated twice by direct energization and induced current. Is high. However, since the distance from one contact 63 to the other contact 95 is uniquely determined according to the length of the long workpiece W to be hardened, the quenching length of the long workpiece W is determined. If it changes, quenching becomes impossible. Therefore, a device having a dimension corresponding to the quenching length of the long workpiece W is required,
When the quenching length of the long workpiece W is various, a large number of quenching devices are required, and there has been a problem that the device cost increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a long work can be efficiently heated twice by direct energization and induction current, and can cope with a change in the quenching length of the long work. It is an object of the present invention to provide a surface hardening device for a shaku work.

[0008]

The surface hardening apparatus for a long work according to the present invention has long works to be hardened arranged side by side, and has a contact at one end for contacting the surface of the long work. At the same time, a quenching liquid is introduced into the inside, and a number of ejection holes for ejecting the quenching liquid are electrically insulated from the induction coil serving also as a cooling jacket provided on the work facing surface and the induction coil. moving the induction coil in the longitudinal direction in a state
A first lead having a contact at its tip end for contacting the surface of the long work, and a first lead arranged side by side with the first lead to directly hold and fix the induction coil. A second lead electrically connected to the induction coil and changing its fixed position, first work pressing means for pressing a long work against the contact of the first lead, and a longitudinal direction of the induction coil. A second work holding means movably provided to press the long work against the contact of the induction coil is provided, and power is supplied to the first lead and the second lead. . Further, the inside of the induction coil is partitioned into a plurality of pieces in the longitudinal direction, and a quenching liquid inlet is provided in each of the partitions.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a side view showing an example of a surface quenching apparatus embodying the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG. .

As shown in FIG. 1, the present quenching apparatus includes an induction coil 30 horizontally supported between a lower base 10 and an upper base 20, and a first coil serving as a support for the induction coil 30.
The lead 40 and the second lead 50 and the first work pressing member
Holding means 70 and second work holding means 80 . The long work W is, for example, a long rail having a rectangular cross section, is horizontally supported on the induction coil 30, and has a lower surface hardened.

The induction coil 30 is a rectangular cylinder made of a highly conductive metal such as copper, and has both ends closed and divided into a plurality of chambers by a partition plate 31 arranged in the longitudinal direction. On the lower surface of the induction coil 30, quenching liquid introduction ports for introducing a quenching liquid into each chamber are provided, and a hose port 32 is attached to each. Induction coil 30
A large number of ejection holes 33 for ejecting the quenching liquid introduced into each of the chambers are provided on the entire upper surface. And
On one end surface of the induction coil 30, a contact 34 that contacts the lower surface of the long work W is provided slightly protruding from the upper surface of the induction coil 30.

The first lead 40 is a column made of a good conductive metal such as copper, and stands upright on the lower base 10. As shown in FIG. 2, a square hole 41 through which the induction coil 30 is inserted is provided on the upper part of the first lead 40. The square holes 41, the angular frame-shaped insulating member 42 made of glass laminate or the like have been fitted, the insulator 42, the induction coil 30 which is inserted through the square holes 41 are movable in the longitudinal direction
It is inserted and held as shown. The lower cutout 42a allows the hose port 32 to pass freely. On the upper surface of the first lead 40, a long work W
The contact 44 that contacts the lower surface of the induction coil 30 is mounted at the same level as the contact 34 of the induction coil 30. First lead 40
One terminal of the high frequency power supply 60 is connected to the lower end of the power supply.

The second lead 50 is a column made of a good conductive metal such as copper, like the first lead 40, and stands upright on the lower base 10. This second lead 50 is
It is on one end side of the induction coil of the lead 40 (on the side of the contact 34) and is adjacent to the first lead 40. Second lead 50
As shown in FIG. 3, upper portions of the pair of holding portions 51, 52
Thereby, both sides of the induction coil 30 are supported from below, and the hose port 32 freely passes between the holding portions 51 and 52. One holding portion 51 has a structure detachable from the second lead 50, and is connected to the other holding portion 52 by a bolt 53. And this holding part 51
The induction coil 30 is connected to the second lead 50
And the second lead 50
Is electrically connected to The other terminal of the high frequency power supply 60 is connected to the lower end of the second lead 50.

The upper base 20 has a first work holding member.
A pair of cylinders 70 as means and a second work holder
A pair of cylinders 80 as means are mounted downward. One of the cylinders 70 is fixedly provided above the first lead 40, and the head 71 presses the long work W downward so that the lower surface of the long work W contacts the first lead 40. 44. The other cylinder 80 is movable in the longitudinal direction of the induction coil 30 and moves on the contact 34 of the induction coil 30 to move the head 8.
1, the long work W is pressed downward.

Next, a quenching operation using the present quenching apparatus will be described.

When the side surface of the long work W is hardened over substantially the entire length, the bolt 53 of the second lead 50 is loosened, and the distance from the contact 34 of the induction coil 30 to the contact 44 of the first lead 40 is long. The induction coil 30 is moved in the longitudinal direction by a moving means (not shown) so as to be substantially the same as the quenching length of the work W. At this time, since the induction coil 30 is inserted and is held so as to be movable in the first lead 40, the moving operation can be smoothly performed. Induction coil 30
Is completed, the bolt 53 of the second lead 50 is tightened, and the induction coil 30 is fixed to the second lead 50. Further, the hose 35 is connected to the hose rod 32 located closer to the contact 34 than the first lead 40 of the induction coil 30, and the cylinder 80 is moved in the longitudinal direction of the induction coil 30 to be positioned on the contact 34.

When the setting of the quenching device is completed as described above, the side surface of the long work W to be quenched faces downward, and one end of the lower surface is supported by the contactor 34 of the induction coil 30. Connect the other end to the contact 44 of the first lead 40.
Supported by Next, the heads 71 and 81 of the cylinders 70 and 80 are lowered to press both ends of the long work W downward. Thereby, the lower surfaces at both ends of the long work W are pressed against the contacts 34 and 44. The upper surface of the induction coil 30 on the contact 34 side from the second lead 50 is a long work W
Are opposed over substantially the entire length of the lower surface of the.

When the setting of the long work W is completed, the high frequency power supply 60 is operated. As a result, the high-frequency current
Lead 40-contact 44-contact 34 of long work W,
44-contact 34-second lead 50 of induction coil 30
It flows through a system path composed of the part closer to the contact 34 and the second lead 50. As a result, the contacts 34, 4 of the long work W
A high-frequency current flows through the lower surface layer portion sandwiched between the layers 4, and the surface layer portion is directly energized and heated. Also, the second of the induction coil 30
The high-frequency current flowing from the lead 50 to the contact 34 side generates a high-frequency induction current in the lower surface layer portion of the long work W sandwiched between the contacts 34 and 44, and this surface layer portion is also heated by induction heating. You.

When the lower surface layer between the contacts 34 and 44 of the long workpiece W is heated to a predetermined quenching temperature, the energization is stopped, and the quenching is performed through the hose 35 from the hose port 32 into the induction coil 30. Introduce liquid. Since the hose 35 is connected only to the hose port 32 located on the side of the contact 34 from the first lead 40 of the induction coil 30, the minimum amount of liquid required for cooling the lower surface of the long work W is reduced by the induction coil 30. Is ejected upward from the ejection hole 33 of the nozzle. Thus, a long work W
Is rapidly cooled to a predetermined quenched structure.

When quenching a part of the long workpiece W in the longitudinal direction, the distance between the contacts 34 and 44 is adjusted according to the quenched length. When quenching a long workpiece W having a different quenching length, the distance between the contacts 34 and 44 is adjusted according to the quenching length. In any case, the induction coil 30 is opposed over substantially the entire length of the surface of the long workpiece W to be hardened, and a high-frequency current flows through that portion. Therefore, the surface of the long workpiece W to be quenched is efficiently heated to the quenching temperature by direct current heating and high-frequency induction heating.

In the above embodiment, the induction coil 30 is supported only by the first lead 40 and the second lead 50. However, the induction coil 30 is guided by another support that does not hinder the longitudinal movement of the induction coil 30. The coil 30 can be supported in an auxiliary manner. Further, the induction coil 30 is mainly supported by another support, and the first lead 40 and the second lead 5
It is also possible to use 0 as an auxiliary support.

[0022]

As described above, according to the first aspect of the present invention, long works to be hardened are juxtaposed,
One end has a contact that comes into contact with the surface of the long work, and a quenching liquid is introduced into the inside, and a large number of ejection holes for ejecting the quenching liquid also serve as a cooling jacket provided on the work facing surface. The induction coil and the induction coil are movable in the longitudinal direction while being electrically insulated from the induction coil.
A first lead having a contact at its tip end for contacting the surface of the long work, and a first lead that is juxtaposed with the first lead and directly holds and fixes the induction coil. A second lead electrically connected to the induction coil and capable of changing its fixed position, first work pressing means for pressing a long work against the contact of the first lead, and moving in a longitudinal direction of the induction coil; A second work holding means is provided arbitrarily and presses the long work to the contact of the induction coil, and the first lead and the second lead are energized.
Therefore, the work surface layer is heated twice by the current supplied to the work surface layer between the contacts and the induced current excited by the induction coil. Moreover, even if the quenching length of the long workpiece changes, there is no need to replace the device, and long hoees having different quenching lengths can be quenched with a single device. Therefore, the number of devices is reduced, and the cost of the devices is greatly reduced. In addition to the effect of the first aspect, the invention according to the second aspect is provided with a plurality of quenching liquid inlets that partition the inside of the induction coil in the longitudinal direction, so that the amount of the ejected liquid and the ejection pressure are substantially reduced. Since it becomes the same, uniform hardening was enabled.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a surface quenching apparatus embodying the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a side view of a conventional surface quenching apparatus.

[Explanation of symbols]

 Reference Signs List 30 induction coil 33 ejection hole 34 contact 40 first lead 44 contact 50 second lead 60 high frequency power supply 70, 80 cylinder W long work

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location C21D 9/32 C21D 9/32 B

Claims (2)

(57) [Claims] 1. A long work to be quenched is juxtaposed, a contact member for contacting the surface of the long work is provided at one end, a quenching liquid is introduced into the inside, and the quench liquid is ejected. An induction coil having a large number of ejection holes also serving as a cooling jacket provided on the work facing surface, and the induction coil is movable in the longitudinal direction while being electrically insulated from the induction coil.
Holds by inserting the so that, a first lead having a contact in contact with the surface of the elongated workpiece on the tip portion, arranged in parallel in said first lead, said induction coil held directly secured to induce A second lead electrically connected to the coil and capable of changing its fixed position, first work pressing means for pressing a long work against the contact of the first lead,
A second work holding means is provided movably in the longitudinal direction of the induction coil and presses the long work against the contact of the induction coil, and the first lead and the second lead are energized. Surface hardening equipment for long workpieces. 2. The surface hardening device for a long work according to claim 1, wherein the inside of the induction coil is partitioned into a plurality of pieces in a longitudinal direction, and a quenching liquid inlet is provided in each of the plurality of pieces.