JPH0554536U - Cooling device for induction hardening - Google Patents

Abstract

(57) [Summary] [Purpose] By increasing the cooling efficiency, the ejection amount of quenching liquid can be reduced and the pump can be made smaller. Reduces the number of nozzle holes and facilitates jacket production. [Structure] The jacket 10 is opposed to the cylindrical work W from both sides. A nozzle hole 12a is provided on the center line of the work facing surface 12 of the jacket 10. Nozzle holes 12b are provided at symmetrical positions across the center line. The center of the nozzle hole 12b is inclined toward the center line. The quenching liquid sprayed onto the cylindrical work W from the nozzle holes 12a and 12b does not exceed the cylindrical work W. Generation of ineffective liquid due to mutual interference of quenching liquids is suppressed, and cooling efficiency is improved.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an induction hardening cooling device which is used for induction hardening of a cylindrical work such as a drive shaft and sprays a hardening liquid onto a heated surface of the cylindrical work.

[0002]

[Prior Art]

 In induction hardening of a cylindrical work such as a drive shaft, the cylindrical work is supported horizontally, and the surface layer of the cylindrical work is induction-heated over the entire length and circumference. When the surface layer portion of the cylindrical work reaches a predetermined quenching temperature, as shown in FIG. 5, the quenching liquid is introduced into the pair of left and right jackets 30 to rapidly cool the surface of the cylindrical work W. The jacket 30 is in the shape of a rectangular tube, and one side surface thereof faces the cylindrical 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 opposite 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, quenching liquid is ejected from a large number of nozzle holes 31 toward the cylindrical work W in a parallel flow state from the upper part to the lower part of the work peripheral surface. It seems that the cooling efficiency is good, as it cools a wide range of and the liquid flies around.

[0004]

[Problems to be solved by the device]

 However, the quenching liquid that collides with the upper and lower portions of the cylindrical work W exceeds the cylindrical work W after the 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 liquids ejected from both sides of the cylindrical work W interfere with each other around the cylindrical work W, and a large amount of so-called ineffective liquid that does not contribute to cooling is generated. It interferes and reduces the cooling efficiency. Therefore, the quenching liquid is required more than necessary, resulting in an increase in pump capacity. In addition, the number of nozzle holes is increased to compensate for the low cooling efficiency, which increases the manufacturing cost of the jacket.

The present invention was devised in view of such circumstances, and an object thereof is to provide a cooling device for induction hardening with high cooling efficiency.

[0006]

[Means for Solving the Problems]

 The cooling device for induction hardening according to the present invention is provided with a jacket in which a quenching liquid is introduced inside, which is opposed to a part of the circumferential surface of the cylindrical work to be induction-hardened for almost the entire length of the cylindrical work. And a plurality of nozzle holes that are provided on the work-opposing surface of the jacket and that are inclined inwardly with a center line on the work-opposing surface parallel to the central axis of the cylindrical work interposed therebetween. ..

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view of an induction hardening cooling apparatus showing an embodiment of the present invention, FIG. 2 is a view taken along the line AA of FIG. 1, and FIG. 3 is a view taken along the line BB of FIG. Is.

The induction quenching cooling device is used for quenching a cylindrical work W. The cylindrical work W is, for example, a drive shaft, has a step portion w perpendicular to the axial direction in the middle, 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 that is opposed to the cylindrical work W over the entire length from the side. The jacket 10 has a two-piece structure that is divided into a work side and a non-work side, and both pieces are joined by so-called snap locks 11 and 11 attached to the upper and lower surfaces.

A large number of nozzle holes 12 a, 12 b, 12 c are formed in the work facing surface 12 of the jacket 10. The nozzle holes 12a are arranged at equal intervals on a center line L-L on the work facing surface parallel to the central axis of the cylindrical work W. The center of the nozzle hole 12a is orthogonal to the workpiece facing surface 12. The nozzle holes 12b are arranged at equal intervals on both symmetrical edge portions with the center line L-L therebetween. The center of the nozzle hole 12b in the upper stage is inclined downward in a plane perpendicular to the center line L-L so as to face the central axis of the cylindrical work W. Similarly, the center of the lower nozzle hole 12b is inclined upward in a plane perpendicular to the center line L-L so as to face the central axis of the cylindrical 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 L-L so as to intersect the step w of the cylindrical work W.

A pressure equalizing plate 20 is provided inside the jacket 10. The pressure equalizing plate 20 is attached to the non-workpiece side piece in a posture parallel to the work facing surface 12. A large number of round holes 21 are formed in a zigzag manner at a uniform density over the entire surface of the pressure equalizing plate 20. Behind the pressure equalizing plate 20, an introduction hole 13 for introducing the quenching liquid into the jacket 10 is formed.

Cooling of the cylindrical work W is performed between a pair of jackets 10 and 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 into the jacket 10 through the introduction hole 13 while the cylindrical work W is rotated in the circumferential direction. To be done. The quenching liquid introduced into the jacket 10 passes through the pressure equalizing plate 20 and is jetted all at once from the nozzle holes 12a, 12b, 12c.

Since the quenching liquid ejected from the nozzle hole 12 a collides right next to the cylindrical work W, the quenching liquid after the collision does not exceed the cylindrical work W. Since the center of the nozzle hole 12b faces the central axis of the cylindrical work W, the quenching liquid ejected from the nozzle hole 12b collides with the upper and lower portions of the peripheral surface of the cylindrical work W, and Hit at right angles to the tangent to the surface. Therefore, the quenching liquid ejected from the nozzle hole 12b also does not exceed the cylindrical work W. Therefore, the quenching liquids ejected from the cooling jackets on both sides do not interfere with each other, and the generation of ineffective liquid is suppressed. As a result, the cooling efficiency is improved, 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 12 c is inclined with respect to the surface of the workpiece facing surface 12 that is perpendicular to the center line L-L, and faces the step w of the cylindrical work W. Therefore, even though the step w is perpendicular to the central axis of the cylindrical work W, a sufficient amount of the quenching liquid collides with it and quenches like other parts.

FIG. 4 shows another work-opposing surface. Nozzle holes 12a are provided in two rows across the center line L-L on the work facing surface 12, and nozzle holes 12c are provided on the outer sides of the nozzle holes 12a. The nozzle hole 12b is provided at a position away from the center line L-L. The nozzle holes 12a, 12a and the nozzle holes 12b, 12b are arranged in a zigzag pattern in order to make the liquid amount uniform in the direction of the center line L-L and to facilitate the processing of the nozzle holes, and the nozzle holes 12c, 12c is also provided with a slight deviation in the direction of the center line L-L.

[0016]

[Effect of the device]

 As described above, the cooling device for induction hardening according to the present invention has a large number of nozzle holes formed in the work-opposing surface of the jacket, and the center line on the work-opposing surface parallel to the central axis of the cylindrical work. Since each of them is inclined inward with the sandwiching in between, the quenching liquid ejected from the nozzle hole is prevented from passing over the cylindrical work, and the generation of ineffective liquid due to mutual interference of the quenching liquids is suppressed. Therefore, the cooling efficiency is improved and the quenching liquid can be reduced, so that the pump can be downsized. Moreover, since the number of nozzle holes can be reduced, it is possible to reduce the processing cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an induction hardening cooling device according to an embodiment of the present invention.

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

FIG. 3 is a view taken along the line BB of FIG.

FIG. 4 is an elevation view showing another work-opposing 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]

 10 Jacket 12 Work Opposing Surface 12a, 12b, 12c Nozzle Hole 13 Introducing Hole 20 Pressure Equalizing Plate W Cylindrical Work

Claims (2)

[Scope of utility model registration request] 1. A jacket, in which a quenching liquid is introduced into a jacket, which is opposed to a part of a circumferential surface of a cylindrical work to be induction hardened in a circumferential direction, over substantially the entire length of the cylindrical work, and a work facing surface of the jacket. And a large number of nozzle holes, each of which is inclined inward with a center line on the work facing surface parallel to the central axis of the cylindrical work sandwiched therebetween, for induction hardening. 2. The induction hardening cooling device according to claim 1, wherein a nozzle hole that is inclined with respect to a surface orthogonal to a center line on the surface facing the work is provided on the surface facing the work.