JP2003105434A - Method and apparatus for hardening inner surface of bottomed cylindrical work while shifting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a uniform hardened layer on the inner surface of a cylindrical part by surely hardening to near a bottom part, in the case of hardening the inner surface of the cylindrical part of a bottomed cylindrical work while shifting in the axial direction. SOLUTION: As for the bottom part of the work 10 disposed at a downside, cooling liquid is supplied into this work 10 and while overflowing the cooling liquid, the inner surface of the cylindrical part of the work 10 is induction-heated in order in the axial direction with a heating coil 20. The outer surface of the cylindrical part of the work 10 is secondary and forcibly cooled by using a cooling jacket 30 disposed at the outer surface side of the heating coil 20 interposing the cylindrical part of the work 10. A flange-like fixture 40 is abutted on the end surface of the opening part of the work 10 so that the overflown cooling liquid is not made to flow down along the outer surface of the cylindrical part of the work 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for moving and quenching the inner surface of a bottomed cylindrical work for axially moving and quenching the inner surface of the cylindrical portion of the bottomed cylindrical work. Incidentally, the bottomed cylindrical work in the present specification, other than the cup-shaped work with a thin bottom,
This includes a shaft-shaped work piece having a bottomed tubular portion partially formed at the end.

[0002]

2. Description of the Related Art Moving quenching is one of the induction hardening methods for parts in which the inner surface of a cylindrical part having a bottom is hardened. As shown in FIG. It was carried out using the inner surface heating coil 1, the inner surface cooling jacket 2, the outer surface cooling jacket 3 and the suction hose 4.

The inner surface heating coil 1 is concentrically inserted into a cylindrical portion 11 which is a cylindrical portion having a bottom and is formed at the end of the shaft-shaped work 10. Induction heating over. The inner surface cooling jacket 2 is connected below the inner surface heating coil 1 and injects the cooling liquid onto the entire inner surface of the tubular portion 11. The outer surface cooling jacket 3 is concentrically arranged on the outer surface side of the inner surface heating coil 1 with the tubular portion 11 of the bottomed tubular portion sandwiched therebetween, and the inner surface heating coil 1 is sprayed with a cooling liquid over the entire outer surface of the tubular portion 11. And moves in the axial direction.

In the quenching work, the inner heating coil 1 is attached to the tubular portion 1.
By moving from the lowermost part in 1 to the upper part,
The inner surface of is heated by induction from the bottom to the top. at the same time,
When the inner surface cooling jacket 2 and the outer surface cooling jacket 3 move upward, the induction heating portion of the inner surface of the tubular portion is rapidly cooled from the inner surface side and the outer surface side, and a quench hardening layer is formed on the inner surface. At this time, the inner surface cooling jacket 2 to the cylindrical portion 1
In order that the cooling liquid injected into 1 does not interfere with the heating by the upper inner surface heating coil 1, the cooling liquid is sequentially discharged by the suction hose 4 to the outside of the cylindrical portion 11.

[0005]

According to the conventional moving and quenching method as shown in FIG. 2, since the inner surface cooling jacket 2 exists below the inner surface heating coil 1, the inner surface of the tubular portion 11 is covered with the bottom portion 12. It is impossible to quench to the vicinity.

The present invention has been devised in view of the above circumstances, and is capable of reliably quenching the inner surface up to the bottom of the bottomed tubular portion and forming a uniform inner hardened layer on the bottomed tubular work. An object of the present invention is to provide a method and an apparatus for moving and quenching inner surface.

[0007]

In order to achieve the above object, the inner surface moving and quenching method for a bottomed cylindrical work according to the present invention is such that the bottom of the bottomed cylindrical work is faced down and cooled in the work. The liquid is contained, and in this state, the inner surface of the cylindrical portion of the bottomed cylindrical work is moved and quenched by a heating coil.

The inner surface moving and quenching apparatus for a cylindrical work having a bottom according to the present invention includes means for supplying a cooling liquid into the cylindrical work having a bottom, and a cylindrical portion of the work inserted into the work. A heating coil for inductively heating the inner surface and a moving means for moving the heating coil in the axial direction relative to the work are provided.

In the inner surface moving and quenching method and apparatus for a bottomed cylindrical work according to the present invention, the induction heating portion on the inner surface of the cylindrical portion of the bottomed cylindrical work is a cooling liquid contained in the bottomed cylindrical work. To quench directly. This allows uniform quenching of the inner surface of the cylinder. Further, since there is no inner surface cooling jacket below the heating coil, quenching can be started with the heating coil being close to the bottom of the inner surface of the tubular portion. Therefore, it is possible to quench the inner surface up to the bottom of the inner surface of the tubular portion.

By using the outer surface cooling jacket arranged on the outer surface side of the heating coil to sandwich the tubular portion of the bottomed cylindrical workpiece, the outer surface of the tubular portion of the bottomed cylindrical workpiece is supplementarily forcibly cooled, thereby Cooling of the induction heating portion on the inner surface of the portion is promoted.

The cooling liquid contained in the bottomed cylindrical work is
Although the temperature rises as quenching progresses, it causes uneven quenching.However, by overflowing the cooling liquid in the cylindrical work with a bottom and performing quenching while supplying new cooling liquid, the bottomed cylinder The temperature rise of the cooling liquid in the workpiece is suppressed,
Further homogenization of quenching quality is realized.

Here, if the overflowed cooling liquid flows down along the outer surface of the cylindrical portion of the workpiece, the cooling from the outer surface side becomes uneven. When the outer surface cooling jacket is used to supplementally forcibly cool the outer surface of the cylindrical portion of the bottomed cylindrical work, the cooling is hindered. For this reason, it is desirable to install a detachable flange-shaped jig on the end face of the opening of the work so that the overflowed cooling liquid does not flow down along the outer surface of the cylinder of the work. This jig also has the effect of suppressing overheating and overcooling in the vicinity of the end face, and thereby also has the effect of making the layer thickness of the quench hardened layer uniform.

The inner surface moving and quenching method and apparatus according to the present invention are particularly effective for a bottomed cylindrical work having an inner diameter of 100 mm or more. This is because the moving quenching in liquid in which the heating coil is immersed in the liquid is essentially lower in efficiency than the moving quenching in the atmosphere, and the efficiency becomes worse as the inner diameter of the work becomes smaller.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an inner surface moving and hardening apparatus according to an embodiment of the present invention.

The bottomed cylindrical work 10 which is an object to be quenched is
Here, for example, it is a shaft-shaped work such as a main shaft having a bottomed cylindrical portion formed at its end.

The inner surface moving and quenching apparatus according to the present embodiment has a bottomed tubular portion 11 formed at an end of the work 10.
The internal heating coil 20, the external cooling jacket 30, the flange-shaped jig 40, the liquid supply pipe 60, and the like are used for moving and quenching the inner surface of the above.

The inner surface heating coil 20 is a circular induction heating coil which is concentrically inserted into the cylindrical portion 11 of the work 10 and faces a part of the inner surface of the cylindrical portion 11 in the axial direction over substantially the entire circumference. The coil 20 is a copper square tube 2
It is a turn coil. A vertical lead 21 made of a copper square tube is connected to this end. Water is supplied through the leads 21 to the inner heating coil 20 for supplying power and cooling the inner heating coil 20 itself. The inner surface heating coil 20 is supported by the linear movement mechanism 50 through the lead 21.

The linear moving mechanism 50 is a mechanism (corresponding to moving means) for moving the inner surface heating coil 20 in the direction of the arrow in the figure and moving it up and down.

The outer surface cooling jacket 30 is an annular body which is concentrically arranged on the outer surface side of the inner surface heating coil 1 with the tubular portion 11 of the bottomed tubular portion sandwiched therebetween, and which is formed from a large number of nozzle holes provided on the inner surface. The cooling liquid is sprayed on the entire outer circumference of the tubular portion 11. Further, it is mechanically connected to the inner surface heating coil 20 and moves in the axial direction together with the inner surface heating coil 20.

The flange-shaped jig 40 is an annular disk made of a metal having a diameter larger than that of the bottomed tubular portion, the outer diameter of which is sufficiently larger than the outer diameter of the bottomed tubular portion, and the inner diameter of which is the bottomed tubular portion. It is set to be equal to or slightly larger than the inner diameter of the groove. The jig 40 is used with its inner peripheral portion placed on the end face of the opening of the bottomed tubular portion, and in this state, the outer peripheral portion projects outside the bottomed tubular portion like a shade. In order to fix the jig 40, an annular notch 41 into which the upper end of the tubular portion 11 fits is provided on the lower surface of the inner peripheral portion of the jig 40. The upper surface of the outer periphery is
In order to improve the drainage property, it is slightly inclined downward toward the outside.

The liquid supply pipe 60 is inserted into the cylindrical portion 11 of the work 10 in order to supply the cooling liquid. More specifically, the liquid supply pipe 60 is a vertical pipe inserted from above the tubular portion 11 into the center of the inner surface heating coil 20 in the tubular portion 11, and has a flange-shaped end plate 61 at the lower end portion thereof. Have The end plate 61 is joined to the lower surface of the inner surface heating coil 20 to close the space between the liquid supply pipe 60 and the inner surface heating coil 20. As a result, the cooling liquid supplied into the cylindrical portion 11 through the liquid supply pipe 60 is efficiently supplied to the inner surface of the cylindrical portion 11 via the inner surface of the bottom portion 12.

Next, a method for moving and quenching the inner surface of the cylindrical portion of the work 10 using the inner surface moving and quenching apparatus according to this embodiment will be described.

The work 10 is erected and fixed with the bottomed tubular portion facing up. A flange-shaped jig 40 is set on the end face of the opening of the bottomed tubular portion of the work 10. The inner surface heating coil 20 is inserted to the lowermost part in the tubular portion 11 of the bottomed tubular portion.
The outer surface cooling jacket 30 is arranged outside the inner surface heating coil 20 with the tubular portion 11 of the bottomed tubular portion interposed therebetween.

In this state, the inner surface heating coil 20 is energized and water is supplied while the cooling liquid is continuously supplied to the inner surface heating coil 20, and the inner surface heating coil 20 is gradually raised. Further, while ejecting the cooling liquid from the outer surface cooling jacket 30, the outer surface cooling jacket 30 is moved upward in synchronization with the inner surface heating coil 20 by the linear movement mechanism 50.

By raising the inner heating coil 20, the tubular portion 1
The inner surface of 1 is induction heated from bottom to top. The heated portion is directly and rapidly cooled by the cooling liquid in the tubular portion 11. As a result, a quench-hardened layer is formed on the inner surface of the tubular portion 11.

At this time, the cooling jacket 30 is attached to the tubular portion 11.
It is excluded from the inside and is arranged outside the tubular portion 11. Therefore, the inner surface heating coil 20 can start moving near the bottom portion 12 of the bottomed tubular portion. Therefore, the hardened layer can be formed up to near the bottom of the inner surface of the tubular portion.

The main cooling of the heating portion is directly performed by the cooling liquid in the cylindrical portion 11. Further, the cooling liquid is efficiently supplied to the inner surface of the tubular portion 11 by the end plate 61. Therefore, even though the cooling jacket 30 is excluded from the inside of the tubular portion 11, the hardened layer on the inner surface of the tubular portion is efficiently and uniformly formed.

In addition to this, the heating portion of the inner surface of the cylindrical portion is cooled from the outer surface side by the cooling jacket 30. Therefore, the cooling efficiency is increased. In addition, burnout is prevented.

When the cooling liquid stays in the cylindrical portion 11, the temperature of the cooling liquid rises as the quenching progresses (the coil rises), and the quenching quality is different between the initial quenching and the final quenching. However, here, the cooling liquid is continuously supplied into the tubular portion 11,
Since the cooling liquid overflows to the outside of the cylinder portion 11,
The temperature rise of the cooling liquid due to the progress of quenching is avoided. Therefore, the quenching quality is stabilized in the axial direction.

When the cooling liquid overflows to the outside of the tubular portion 11, when the cooling liquid flows down along the outer surface of the tubular portion 11, the tubular portion 11 is cooled from the outer surface side and the cooling is promoted. The outer surface cooling by means of is extremely nonuniform as compared with the outer surface cooling by means of the cooling jacket 30. In addition, when the cooling jacket 30 is used, the flow of the cooling liquid injected from the cooling jacket 30 to the outer surface of the tubular portion 11 is disturbed by the overflow liquid, and the outer surface cooling by the injection liquid is hindered.

However, in this embodiment, the flange-shaped jig 40 is set on the end face of the opening of the bottomed tubular portion of the work 10, and the cooling liquid overflowing from the tubular portion 11 is transferred to the tubular portion 11. Run down without touching the outside. For this reason,
Despite overflowing the cooling liquid to the outside of the cylindrical portion 11, stable and efficient cooling of the outer surface, and thus quenching of the inner surface is performed.

Further, in the inner surface moving quenching of the bottomed tubular portion, the quenching quality is different near the opening, and the quenching layer tends to be thick especially. This is because heat is not transferred to the opening side for induction heating, and heat accumulates near the opening. For forced cooling, the cooling liquid overflows on the end face and promotes cooling near the opening. Is the cause. However, when the flange-shaped jig 40 is set on the end surface of the opening of the work 10 as in the present embodiment, heat is transferred to the opening side like the other portions, and the end surface of the cooling liquid is also transferred. Direct contact with is avoided. Therefore, a hardened layer is formed in the vicinity of the opening as well as other portions. That is, the quenching quality becomes uniform in the work axis direction.

In this way, in this embodiment, the intended purpose of securely and uniformly quenching the inner surface up to the vicinity of the bottom of the bottomed tubular portion is effectively achieved.

In the above embodiment, the work 10 is fixed and the heating coil 20 and the cooling jacket 30 are moved in the work axis direction. However, the heating coil 20 and the cooling jacket 30 are fixed and the work 10 is moved. Or both may be moved.

As for the heating coil 20, a hollow tube through which water can be passed was used, but since it is used in the cooling liquid in the tubular portion 11, water cooling can be omitted, and a solid material is used. Can be manufactured by.

Although the linear moving mechanism 50 is used as the moving means in the above embodiment, it may be replaced with, for example, a table for moving the work 10 up and down.

It is not always necessary to use the cooling jacket 30.

The cooling liquid is usually water, but liquids other than water can be used.

[0040]

As described above, the inner surface moving and quenching method and apparatus for a bottomed cylindrical work according to the present invention is effective for moving and quenching the inner surface of the cylindrical portion of the bottomed cylindrical work in the axial direction. The bottom part of the bottom cylindrical work is stored in the work with the bottom part facing down, and in this state, the inner surface of the bottom part of the cylindrical work is induction-heated sequentially in the axial direction by the heating coil. The induction heating part of can be directly and rapidly cooled by the cooling liquid contained in the bottomed cylindrical work. As a result, the inner surface can be surely quenched to the vicinity of the bottom of the bottomed tubular portion, and a uniform inner hardened layer can be formed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an inner surface moving and quenching apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional inner surface moving and quenching apparatus.

[Explanation of symbols]

10 work 11 tube 12 bottom 20 Internal heating coil 30 External cooling jacket 40 Flange-shaped jig 50 Linear movement mechanism (moving means)

Claims (5)

[Claims] 1. A method for moving and quenching the inner surface of a bottomed tubular work, wherein the inner surface of a tubular work of the bottomed tubular work is axially moved and hardened, and the bottom of the bottomed cylindrical work is placed in the bottom of the work. A method for moving and quenching an inner surface of a bottomed cylindrical work, characterized in that a cooling liquid is contained, and in this state, the inner surface of the cylindrical portion of the bottomed cylindrical work is moved and quenched by a heating coil. 2. A means for supplying a cooling liquid into a bottomed cylindrical work, a heating coil which is inserted into the work and induction heats an inner surface of a cylindrical portion of the work, and the heating coil is axially arranged in the axial direction. An inner surface moving and quenching apparatus for a cylindrical work with a bottom, comprising: a moving unit that moves the work relative to the work. 3. The inner surface moving and quenching apparatus for a bottomed cylindrical work according to claim 2, wherein the cylindrical outer surface of the bottomed cylindrical work is disposed outside the heating coil with the cylinder of the work sandwiched therebetween. An inner surface moving and quenching apparatus for a cylindrical work having a bottom, comprising an outer surface cooling jacket for forced cooling. 4. The inner surface moving and quenching apparatus for a cylindrical work with a bottom according to claim 2 or 3, wherein the cooling liquid in the cylindrical work with a bottom overflows. Quenching equipment. 5. A bottomed cylindrical work-moving and quenching device for a cylindrical work according to claim 4, wherein the jig is a jig that is attachable to and detachable from the end face of the opening of the work, and the overflowed cooling liquid is applied to the outer surface of the cylinder of the work. An inner surface moving and quenching apparatus for a cylindrical work having a bottom, comprising a flange-shaped jig for preventing the material from flowing down.