JP2528940Y2 - Cooling device for induction hardening - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for induction hardening which is used for induction hardening of a cylindrical work such as a drive shaft and sprays a quenching liquid on a heated surface of the cylindrical work.

[0002]

2. Description of the Related Art In induction hardening of a cylindrical work such as a drive shaft, the cylindrical work is horizontally supported, and the surface layer is induction-heated over the entire length and the entire circumference. When the surface portion of the cylindrical work reaches a predetermined quenching temperature, a quenching liquid is introduced into the pair of left and right jackets 30 to rapidly cool the surface of the cylindrical work W as shown in FIG. The jacket 30 has a rectangular cylindrical shape, and one side surface thereof is opposed to the columnar work W from the side over the entire length. As shown in FIG. 6, a large number of nozzle holes 31 are formed in a zigzag pattern on the facing surface of the jacket 30 at a uniform density over the entire surface. The center of each nozzle hole 31 is orthogonal to the work facing surface of the jacket 30.

In cooling using such a jacket 30, a quenching liquid is ejected from a large number of nozzle holes 31 in a parallel flow toward a columnar work W, and the quenching liquid flows from the upper part to the lower part of the peripheral surface of the work. It cools a wide area, and the liquid flies, as if the cooling efficiency is good.

[0004]

However, the quenching liquid that collides with the upper and lower parts of the columnar work W exceeds the columnar work W after collision because the collision angle with respect to the work peripheral surface is small. Further, a quenching liquid that exceeds the cylindrical work W without colliding with the cylindrical work W is also generated. Therefore, the quenching liquid ejected from both sides of the columnar work W interferes with each other around the columnar work W, so-called ineffective liquid that does not contribute to cooling is generated in a large amount, and further hinders the effective liquid, Decrease cooling efficiency. Therefore, a quenching liquid is required more than necessary, which causes an increase in pump capacity. Further, the number of nozzle holes is increased to compensate for the low cooling efficiency, which leads to an increase in the manufacturing cost of the jacket.

The present invention has been made in view of such circumstances, and has as its object to provide a cooling device for induction hardening having high cooling efficiency.

[0006]

SUMMARY OF THE INVENTION A cooling device for induction hardening according to the present invention is a cooling device for a columnar work having a step portion at an intermediate portion.
Cooling for induction quenching by spraying a quenching liquid on the heated surface
In the equipment, the pair is almost completely
With a pair of jackets arranged facing
The jacket is a pair of workpieces parallel to the central axis of the workpiece.
Opened on the center line on the opposite side, facing the center axis of the work
Open to the first nozzle hole and symmetrical edges sandwiching the center line.
A second nozzle installed and inclined toward the central axis of the workpiece
A hole and a first nose with a part of the center line sandwiching the center line.
Is set up outside the hole and tilts toward the step of the workpiece.
And a third nozzle hole .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an induction hardening cooling device showing an embodiment of the present invention, FIG. 2 is a view taken along line AA of FIG. 1, and FIG. 3 is a view taken along line BB of FIG. is there.

[0008] The cooling device for induction hardening is a cylindrical work W
Used for quenching. The columnar workpiece W is, for example, a drive shaft and has a stepped portion w perpendicular to the axial direction at an intermediate portion, is horizontally supported by a support mechanism (not shown), and is rotated in the circumferential direction.

The cooling device is provided with a rectangular tubular jacket 10 which is opposed to the columnar work W from the side over the entire length. The jacket 10 has a two-piece structure that is divided into a work side and a non-work side, and the two pieces are connected by so-called snap locks 11, 11 attached to upper and lower surfaces.

On the work facing surface 12 of the jacket 10,
Many first nozzle holes 12a (hereinafter simply referred to as nozzle holes 12a )
a), the second nozzle hole 12b (hereinafter simply referred to as the nozzle
Hole 12b), third nozzle hole 12c (hereinafter simply referred to as hole 12b).
A third nozzle hole 12c) is provided. The nozzle holes 12a are arranged at equal intervals on a center line LL on the work facing surface parallel to the central axis of the columnar work W.
The center of the nozzle hole 12a is orthogonal to the work facing surface 12. The nozzle holes 12b are arranged at equal intervals on both edges symmetrical with respect to the center line LL. Upper nozzle hole 12
The center of b is inclined downward in a plane perpendicular to the center line LL so as to face the central axis of the columnar work W. Similarly, the center of the lower nozzle hole 12b is inclined upward in a plane perpendicular to the center line LL so as to face the central axis of the columnar work W. The nozzle holes 12c are provided in two rows with the center line LL interposed therebetween in a part of the direction of the center line LL. The center of the nozzle hole 12c is inclined with respect to a plane perpendicular to the center line LL so as to intersect with the step w of the cylindrical work W.

A pressure equalizing plate 20 is provided inside the jacket 10. The equalizing plate 20 is attached to a piece on the side opposite to the work in a posture parallel to the work facing surface 12. In the pressure equalizing plate 20, a large number of round holes 21 are formed in a staggered manner at a uniform density over the entire surface. An introduction hole 1 for introducing a quenching liquid into the jacket 10 is provided behind the equalizing plate 20.
3 have been established.

The cooling of the columnar workpiece W is performed between a pair of jackets 10 arranged at a predetermined interval. When the surface layer of the cylindrical work W is heated to the quenching temperature over the entire circumference, the quenching liquid is introduced from the introduction hole 13 into the jacket 10 while the cylindrical work W is rotated in the circumferential direction. Is done. The quenching liquid introduced into the jacket 10 passes through the pressure equalizing plate 20 and passes through the nozzle holes 12a and 12a.
b and 12c are simultaneously ejected.

The quenching liquid ejected from the nozzle hole 12a is:
Since the collision occurs right beside the cylindrical work W, the quenching liquid after the collision does not exceed the cylindrical work W. Nozzle hole 12b
Of the quenching liquid ejected from the cylindrical work W, the center of the nozzle hole 12b is directed to the central axis of the cylindrical work W.
Collides with the upper and lower portions of the peripheral surface slightly, and at a right angle to the tangent to the peripheral surface. Therefore, the nozzle hole 12
The quenching liquid ejected from b does not exceed the columnar workpiece W. Therefore, the quenching liquids ejected from the cooling jackets on both sides do not interfere with each other, and generation of an ineffective liquid is suppressed. As a result, the cooling efficiency is increased, the injection amount of the quenching liquid can be reduced, and the number of nozzle holes can be reduced.

The center of the nozzle hole 12c is inclined with respect to a plane perpendicular to the center line LL on the work facing surface 12 and faces the step w of the cylindrical work W. Therefore, although the step portion w is perpendicular to the central axis of the columnar workpiece W, a sufficient amount of the quenching liquid collides and is quenched similarly to the other portions.

FIG. 4 shows another work facing surface. Nozzle holes 12a are located across the center line LL on the workpiece facing surface 12
The nozzle holes 12c are provided on the outside of each row. The nozzle hole 12b is provided at a position away from the center line LL. In order to equalize the liquid amount in the direction of the center line LL and to facilitate the processing of the nozzle holes, the nozzle holes 12a, 12a and the nozzle holes 12
b, 12b are arranged in a staggered manner, and the nozzle holes 12c, 12b
c is also slightly displaced in the direction of the center line LL.

[0016]

[Effects of the Invention] As described above, the jacket of the cooling device for induction hardening according to the present invention has a step portion at the intermediate portion.
Sprays a quench liquid on the heated surface of a cylindrical workpiece
In the induction hardening cooling device,
A pair of jackets that are arranged facing each other over almost the entire length
And the jacket is provided inside the workpiece.
It is set up on the center line on the work facing surface parallel to the
A first nozzle hole facing the central axis of the
Established on both symmetrical edges, toward the center axis of the workpiece
A second nozzle hole inclined at a
The work is opened outside the first nozzle hole with the center line
And a third nozzle hole inclined toward the step portion of
I have. Therefore, the injection liquid ejected from the nozzle hole is prevented from crossing the cylindrical work, and the generation of the invalid liquid due to the mutual interference of the quenching liquid is suppressed. Therefore, the cooling efficiency is increased and the amount of the quenching liquid can be reduced, so that the pump can be downsized. Further, since the number of nozzle holes can be reduced, the processing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an induction hardening cooling device showing an embodiment of the present invention.

FIG. 2 is a view taken along the line AA of FIG. 1;

FIG. 3 is a view taken along line BB of FIG. 2;

FIG. 4 is an elevation view showing another work facing surface.

FIG. 5 is a schematic view showing cooling by a conventional jacket.

FIG. 6 is an elevational view showing a work facing surface of a conventional jacket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Jacket 12 Work facing surface 12a, 12b, 12c Nozzle hole 13 Introducing hole 20 Equalizing plate W Columnar work

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylindrical work having a step in an intermediate portion.
Cooling for induction quenching by spraying a quenching liquid on the heated surface
In the equipment, the pair is almost completely
With a pair of jackets arranged facing
The jacket is a pair of workpieces parallel to the central axis of the workpiece.
Opened on the center line on the opposite side, facing the center axis of the work
Open to the first nozzle hole and symmetrical edges sandwiching the center line.
A second nozzle installed and inclined toward the central axis of the workpiece
A hole and a first nose with a part of the center line sandwiching the center line.
Is set up outside the hole and tilts toward the step of the workpiece.
And a third nozzle hole .