JP2002003935A - Hardening coil body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hardening coil body with which the service life is prolonged and the uneven cooling is hardly occurred. SOLUTION: This hardening coil body is provided with a heating conductive part 110 faced to a shaft-like work W and a hardening liquid supplying part 120 juxtaposed at the heating conductive part 110. The hardening liquid supplying part 120 is juxtaposed on the outer surface 114 at the opposite side of the inner surface 113 faced to the shaft-life work W in the heating conductive part 110. In the inner part of the heating conductive part 110, ribs 111 are crossed between the inner surface 113 and the outer surface 114 of the heating conductive part 11. This rib 111 is opened toward the shaft-like work W and also, an injection hole 112 connected with the hardening liquid supplying part 120, is opened so that hardening liquid L supplied from the hardening liquid supplying part 120 is injected to the shaft-like work W through the injection hole 112.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a quenched coil body for forming a hardened layer on a work.

[0002]

2. Description of the Related Art For example, as shown in FIG. 2, in order to form a hardened layer on the peripheral surface of a shaft-shaped work W, a ring-shaped quenched coil body 200 is used. This quenched coil body 20
0 has a ring-shaped heating conductor 210 and a pair of power supply conductors (not shown) connected to the heating conductor 210. The heating conductor 210 and the power supply conductor are hollow inside so that the quenching liquid L can be supplied to the inside.
Further, the heating conductor portion 210 has a plurality of injection holes 21 on a surface facing the shaft-shaped work W, that is, an inner surface 213.
2 have been established. The injection hole 212 communicates with a hollow portion inside the heating conductor portion 210, and is configured to inject the supplied quenching liquid L toward the shaft-shaped workpiece W.

The quenched coil body 200 is provided with a cooling section 220 for cooling the heating conductor section 210. The cooling section 220 is provided on the outer surface 214 of the heating conductor section 210, that is, at a position farthest from the shaft-shaped work W. The cooling section 220 is formed in a substantially ring shape, and has an inner surface side, that is, the heating conductor section 21.
0 has a substantially U-shaped cross section in which a portion facing the outer surface side is open. The cooling section 220 is connected to the heating conductor section 210.
Thus, a coolant circulation path 221 through which the coolant circulates is formed between the heating conductor 210 and the heating conductor 210.

[0004]

However, the above-mentioned conventional hardened coil body has the following problems.
The quenched coil body is not cooled because the coolant is in contact with the outer surface of the heating conductor, which is the least heated part, rather than the inner surface facing the shaft-shaped work, which is the most heated part of the heating conductor. Not efficient. For this reason, deformation due to the heat of the quenched coil body is likely to occur. In particular, when the current supplied through the power supply conductor is a relatively low frequency current used for quenching at about 10 KHz, there is a problem that the service life is particularly shortened. Comparing at the same frequency, when quenching with a shallow quenching depth is performed, high power and short-time heating are performed, so that the current becomes large and the service life may be shortened.

Further, since the quenching liquid is merely opened on the inner surface of the heating conductor, the length thereof is the same as the thickness of the inner surface constituting the heating conductor. For this reason, the quenching liquid injected from the injection holes is turbulent, which may cause uneven cooling of the shaft-shaped work.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a quenched coil body which has a long life and hardly causes uneven cooling.

[0007]

According to the present invention, there is provided a quenching coil body including a heating conductor facing a work, and a quenching liquid supply unit provided in parallel with the heating conductor. The liquid supply unit is provided in parallel with the surface of the heating conductor that is opposite to the surface facing the workpiece, and the inside of the heating conductor is bridged between the inner surface and the outer surface of the heating conductor. A rib is formed, and the rib is opened toward the work, and an injection hole connected to the quenching liquid supply unit is opened, and the quench liquid supplied from the quench liquid supply unit is sprayed. It is designed to be sprayed onto the work through the hole.

[0008]

FIG. 1 is a schematic sectional view of a quenched coil body according to an embodiment of the present invention.

First, a work to be quenched by the quench coil body according to the embodiment of the present invention is a shaft-shaped work W. A hardened layer is formed on the peripheral surface of the shaft-shaped work W by quenching.

[0010] Quenched coil body 1 according to an embodiment of the present invention
00 denotes a heating conductor 11 facing the shaft-shaped workpiece W.
0, and a quenching liquid supply section 120 provided in parallel with the heating conductor section 110, and the quenching liquid supply section 120 has a surface different from the surface of the heating conductor section 110 facing the shaft-shaped workpiece W. The heating conductor portion 110 has an opening on an inner surface 113 facing the shaft-shaped work W, and the heating conductor portion 110 has an opening on an inner surface 113 facing the shaft-shaped workpiece W. An injection hole 112 opened in the outer surface 114 is opened so as to be continuous, and the quenching liquid L supplied from the quenching liquid supply unit 120 is injected to the shaft-shaped workpiece W through the injection hole 112. I have.

The heating conductor section 110 has an outer surface 114 and an inner surface 113 in which three ribs 111 are provided at regular intervals.
It is hung between. The rib 111 divides the inside of the heating conductor 110 into four vertically overlapping cooling liquid flow passages 115. Also, the rib 111 has
A plurality of injection holes 112 communicating between the outer surface 114 and the inner surface 113 are provided. Therefore, this injection hole 112
Are opened toward the shaft-shaped work W.

On the other hand, the quenching liquid supply section 120 is formed in a substantially ring shape, and has an inner surface side, that is, the heating conductor section 1.
10 has a substantially U-shaped cross section in which a portion facing the outer surface 114 side is opened. By attaching the quenching liquid supply section 120 to the heating conductor section 110, the heating conductor section 110
The quenching supply path 121 through which the quenching liquid L is supplied is formed.

Since the injection hole 112 is opened on the outer surface 114 side of the heating conductor portion 110, the quenching liquid supply path 1 is formed.
21 will be communicated. Therefore, the quenching liquid supply path 12
The quenching liquid L supplied to 1 is injected to the shaft-shaped work W via the injection holes 112.

The quenched coil body 100 constructed as described above
The quenching operation of the shaft-shaped workpiece W using the method will be described. First, the shaft-shaped work W is set inside the heating conductor 110. Then, the power is supplied from a power source (not shown) to the heating conductor 110 via a power supply conductor (not shown). Thereby, the peripheral surface of the shaft-shaped workpiece W is induction-heated.

At the time of heating the shaft-shaped work W, the heating conductor 1
10 is being cooled. The quenching liquid supply passage 121 of the quenching liquid supply unit 120 is filled with the quenching liquid L, but is not injected from the injection holes 112 because no pressure is applied.

The surface area of the inner surface of the cooling liquid flow passage 115 is larger than that of the conventional case having no ribs by the provision of the ribs 111. For this reason, the coolant flow passage 11
The cooling effect of the heating conductor 110 by the cooling liquid flowing through 5 is improved.

After the predetermined heating is completed, pressure is applied to the quench liquid L filling the quench liquid supply passage 114, and the quench liquid L is injected from the injection hole 112 toward the shaft-shaped workpiece W. Let it. By the injection of the quenching liquid L, quenching of the peripheral surface of the shaft-shaped work W is completed.

Since the injection hole 112 is formed in the rib 111, the injection hole 112 is longer than the conventional one which is simply opened on the inner surface 213 of the heating conductor 210. For this reason, since the quenching liquid L injected from the injection holes 112 is close to a laminar flow, uneven cooling is reduced.

[0019]

The quenching coil body according to the present invention includes a heating conductor facing the work, and a quenching liquid supply unit provided in parallel with the heating conductor. The heating conductor is provided on a surface of the heating conductor opposite to the surface facing the workpiece, and inside the heating conductor is formed a rib extending between an inner surface and an outer surface of the heating conductor. The rib is provided with an injection hole that opens toward the workpiece and is connected to the quenching liquid supply unit. The quenching liquid supplied from the quench liquid supply unit receives the quenching liquid through the injection hole. It is being sprayed on the work.

Therefore, when this quenched coil body is used, the heating conductor is cooled through the rib having the injection hole formed therein, so that the cooling efficiency is higher than the conventional one. For this reason, since the deformation due to heat is reduced, the life of the quenched coil body is prolonged. For example, it has been experimentally confirmed that the current used for quenching at a frequency of about 10 KHz can secure about three times the life of a current having a relatively low frequency. Further, since the ribs are formed, the stiffness of the quenched coil body is higher than that of the conventional one having no ribs, so that it is resistant to thermal deformation. Further, since the injection hole is formed in the rib, it is longer than the conventional one which is simply opened on the inner surface of the heating conductor. For this reason, since the quenching liquid injected from the injection holes 112 is close to laminar flow, there is also an effect that cooling unevenness is reduced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a quenched coil body according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view of a conventional hardened coil body of this type.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Quenching coil body 110 Heating conductor part 111 Rib 112 Injection hole 120 Quenching liquid supply part L Quenching liquid W Shaft-like work

Claims (1)

[Claims] 1. A heating conductor portion facing a work, and a quenching liquid supply portion provided in parallel with the heating conductor portion,
The quenching liquid supply unit is provided in parallel with the surface of the heating conductor opposite to the surface facing the workpiece, and the inside of the heating conductor is hung between the inner surface and the outer surface of the heating conductor. A handed-off rib is formed, and the rib is provided with an opening toward the work and an injection hole connected to the quenching liquid supply unit, and the quenching liquid supplied from the quench liquid supply unit is provided. A quenched coil body, wherein a liquid is sprayed onto a workpiece through a spray hole.