JPH0643169Y2 - Oxidation quenching equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to an oxidation-free quenching apparatus using an induction heating coil.

<Conventional Technology> A conventional technology will be described below with reference to the drawings.

FIG. 3 is a schematic explanatory view of a conventional non-oxidizing quenching apparatus. As shown in FIG.
The lower open casing 2 is arranged so that the lower part of the peripheral wall 2a is immersed, and the peripheral wall 2a is shared with the casing 2 so as to be adjacent to the casing 2, and the lower part of the peripheral wall 12a is also immersed in the cooling liquid L. A spare room 12 is provided. Surrounding wall
2a and 12a have openable shutters 2b and 1 respectively
2b is installed.

The casing 2 and the preliminary chamber 12 are filled with a non-oxidizing or reducing gas G by means not shown. Then, the shaft-shaped workpiece 3 carried into the preliminary chamber 12 through the shutter 12b by a walking beam (not shown).
Is carried into the casing 2 through the shutter 2b by another walking beam (not shown) installed in the preliminary chamber 12 and placed on the correction roller 4 in the casing 2. The straightening roller 4 is attached to a work lifting device (not shown) supported from the bottom of the tank 10. Both ends (front and rear direction in the figure) of the work 3 are held and rotated by center pins (not shown).

A saddle-shaped semi-open type high frequency heating coil (hereinafter, simply referred to as a heating coil) is provided above the casing 2. The work 1 is raised by the work elevating device until the heating coil 5 approaches the work 1 so as to straddle the work 1. Then, a high frequency current is supplied from a high frequency power source (not shown) for a predetermined time to heat the work 3. After that, the work 3 is lowered together with the straightening roller 4 by the work elevating device and immersed in the cooling liquid L. Then, the cooling liquid L is sprayed onto the work 3 from the pair of jackets 6 arranged on both sides of the immersed work 3 to quench the work 3.

Reference numeral 11 denotes a cooling liquid storage tank communicating with the bottom of the tank 10. The cooling liquid L sucked by the cooling liquid supply pump 8 from the vicinity of the bottom of the cooling liquid storage tank 11 is the cooling liquid L when the work 3 is in the cooling liquid L. It is supplied to the jacket 6 through the solenoid valve 9 opened when immersed in the. When the cooling of the work 3 is completed, the electromagnetic valve 9 is closed and the injection of the cooling liquid L from the jacket 6 is completed. After that, when the work 3 is dropped onto the conveyor 13 by a work falling device (not shown), the work 3 is carried out of the cooling liquid L by the conveyor 13.

Then, the straightening roller 4 again rising above the liquid surface of the cooling liquid L
After the next work 3 is placed on top, it is quenched in the same manner as above.

<Problems to be Solved by the Invention> However, the above-mentioned conventional non-oxidative quenching apparatus has the following problems.

When the work 3 is cooled by injecting the work 3 into the cooling liquid L while injecting the work 3 into the cooling liquid L, the work 3 is cooled as compared with the case where the work 3 is cooled by injecting the cooling liquid L in the atmosphere gas. Since the degree of quenching is low, it is difficult to obtain a favorable hardened layer or surface hardness depending on the material of the work 3.

The present invention was devised in view of the above circumstances, and provides an oxidation-free quenching device that has a large degree of quenching, and is able to obtain a favorable hardened layer and surface hardness for a work without being affected by the material of the work. The purpose is to do.

<Means for Solving the Problems> In order to solve the above problems, the non-oxidizing quenching apparatus of the present invention is a non-oxidizing or reducing gas filled, the lower end of the peripheral wall of the lower end that is immersed after cooling is opened. The casing, the high-frequency heating coil for heating the work, the lifting device for raising and lowering the high-frequency heating coil, the jacket for injecting the cooling liquid onto the work, and the cooling liquid sprayed from the jacket while the high-frequency heating coil is heating the work. A high-frequency heating coil, a waterproof plate fixed to the high-frequency heating coil so as not to hit the high-frequency coil, a pump for supplying the cooling liquid to the jacket, and a plurality of valves provided in parallel in the pipe from the pump to the jacket. And the jacket are installed in the casing, the pump is continuously operated, and at least one valve is always opened to constantly inject the cooling liquid from the jacket. Then, while the other valves are opened and the work is rapidly cooled, the high-frequency heating coil is raised together with the waterproof plate by the lifting device.

<Operation> The casing is filled with a non-oxidizing or reducing gas. The pump is running continuously, at least one valve is always open and the jacket is constantly injecting cooling liquid. The sprayed cooling liquid hits the waterproof plate fixed to the high frequency heating coil arranged close to the work and falls into the tank containing the cooling liquid.

After heating the work by applying a high-frequency current to the heating coil for a certain period of time, raise the heating coil together with the waterproof plate by the heating coil elevating device and at the same time open other valves for a certain period of time to remove a large amount of cooling liquid from the jacket. After the work is jetted to quench the work, the other valve is closed and the amount of the cooling liquid jetted from the jacket is reduced again. Next, the work is carried out of the casing. Then, the next work is carried into the casing and similarly quenched.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are schematic explanatory views of an embodiment of the present invention. FIG. 1 shows a state where a work is heated, and FIG. 2 shows a state where the work is cooled. In these figures,
The same components as those described in FIG. 3 are designated by the same reference numerals. The non-oxidative quenching apparatus of the present embodiment is a non-oxidative quenching apparatus that quenches a shaft-shaped work similarly to the conventional non-oxidative quenching apparatus described in FIG. Since only the following points are different from the conventional non-oxidizing quenching apparatus, only the different points will be described below.

(A) The pair of jackets 6 are arranged not on the cooling liquid L but on both sides of the heating coil 5.

(B) A pair of waterproof plates 7 are attached to both sides of the heating coil 5. The waterproof plate 7 has such a width that the cooling liquid L sprayed by the jacket 6 does not reach the work 3 heated by the heating coil 5.

(C) Two solenoid valves 9a and 9b connected in parallel are provided in the discharge side pipe of the cooling liquid supply pump 8. Regarding the capacity of the solenoid valve 9a and the capacity of the solenoid valve 9b, the capacity of the solenoid valve 9a is larger than the capacity of the solenoid valve 9b, for example, 10: 1.

(D) A heating coil elevating device for elevating the high frequency heating coil 2 is provided.

Next, the operation of this embodiment will be described.

The casing 2 is filled with a non-oxidizing gas or a reducing gas by means not shown above. After the heating coil 5 is raised in the direction of arrow B by the heating coil lifting device (not shown), the work 3 is placed on the straightening roller 4 by the walking beam. Then, the heating coil elevating device lowers the heating coil 5 in the direction of the arrow A and arranges the heating coil 5 close to the work 3 so as to straddle the work 3.

When the pump 8 is started and the solenoid valve 9b is opened, a small amount of cooling liquid L is jetted from the pair of jackets 6, but hits the waterproof plate 7 of the heating coil 5 and drops into the tank 1. The work 3 is rotated by the center, and a high frequency current is supplied to the heating coil 5 from a high frequency power source (not shown) for a predetermined time to heat the work 3.

Next, the heating coil 5 is lifted together with the waterproof plate 7 in the direction of the arrow B by the heating coil elevating device, and at the same time, the solenoid valve 9a is opened to inject a large amount of the cooling liquid L from the jacket 6 onto the work 3 and To quench. After performing this rapid cooling for a predetermined time, the electromagnetic valve 9a is closed to reduce the amount of the cooling liquid L jetted from the jacket 6 again, and the straightening roller 4 is lowered below the liquid level of the cooling liquid L by the work elevating device. When the work 3 is dropped onto the conveyor 13 by the work falling device, the conveyor 13 carries the work 3 out of the cooling liquid.

When the work 3 falls onto the conveyor 13, the straightening roller 4 is moved to the liquid surface of the cooling liquid L again by the work elevating device. Then, the next work 3 is carried into the casing 2 and placed on the straightening roller 4 similarly to the first work 3, and then the heating coil 5 is moved by the heating coil lifting device.
Lowers to heat the next work 3.

Thereafter, a plurality of works 3 can be non-oxidatively quenched in the same manner as described above. Then, the pump 8 is continuously operated until the quenching of all the works 3 is completed, and the solenoid valve 9b is operated.
The cooling liquid L is always sprayed from the jacket 6 because the cooling liquid L remains open. That is, after the work 3 is heated, cooling can be started immediately without delay.

In order to prevent outside air from entering the casing 2 and the preliminary chamber 12, the inside of the casing 2 and the preliminary chamber 12
The pressure of the gas G in 12 is made slightly higher than the pressure of the outside air.

In this embodiment, the device for quenching the shaft-shaped work 3 has been described, but the non-oxidizing quenching device of the present invention is not limited to the shaft-shaped work 3, and is suitable for the work instead of the straightening roller 4 and the center. By using a work supporting means, a heating coil suitable for the work instead of the saddle-shaped semi-open type heating coil 5, and a transfer means suitable for the work instead of the conveyor 13, It is possible to quench the work of non-oxidation.

In addition, although two solenoid valves 9a and 9b are provided in the present embodiment, since the capacity of the solenoid valve is limited, the number of solenoid valves is not limited to two, and the solenoid valve 9a is composed of a plurality of solenoid valves. Or, the solenoid valve 9b is composed of a plurality of solenoid valves, and further,
Each of the solenoid valves 9a and 9b may be composed of a plurality of solenoid valves. Further, instead of the solenoid valve, a hydraulic valve, an air valve or the like may be adopted.

Further, in the present embodiment, the method of lowering the quenched work 3 below the liquid surface of the cooling liquid L just below the casing 2 and carrying it out of the cooling liquid L by the conveyor has been described, but the present invention is not limited to the conveyor. It may be carried out by a walking beam or the like.

<Effects of the Invention> As described above, the non-oxidizing quenching apparatus of the present invention is a jacket filled with a non-oxidizing or reducing gas and having a lower end of a peripheral wall immersed in a cooling liquid in a casing with an open lower end. The cooling liquid is always sprayed from the, so that the cooling liquid sprayed by the waterproof plate fixed to the high frequency heating coil does not hit the work during heating of the work, and the amount of the cooling liquid sprayed is increased when the work is rapidly cooled. At the same time, the heating coil is lifted together with the waterproof plate to spray the cooling liquid on the work.

As described above, since the non-oxidation quenching apparatus of the present invention performs the injection cooling of the cooling liquid in the atmospheric gas, it has a higher degree of quenching than the injection cooling of the cooling liquid in the cooling liquid. Therefore, the work hardened by the non-oxidizing quenching apparatus of the present invention can obtain good hardened layer and surface hardness without being affected by the hardenability of the material of the work.

As a result of the pressure of the cooling liquid being constantly applied to the piping of the cooling liquid from the solenoid valve to the jacket, air is not mixed into this piping, so that complete non-oxidative quenching can always be performed in the casing.

[Brief description of drawings]

1 and 2 are schematic explanatory views of an embodiment of the present invention. FIG. 1 shows a state where a work is heated, and FIG. 2 shows a state where the work is rapidly cooled. FIG. 3 is a schematic explanatory view of a conventional non-oxidizing quenching apparatus. 2 ... Casing, 2a ... Peripheral wall, 3 ... Work, 5 ...
Heating coil, 6 ... Jacket, 7 ... Waterproof plate, 8 ...
Pump, 9a, 9b ... Solenoid valve, G ... Gas, L ... Coolant.

Claims (1)

[Scope of utility model registration request] 1. A casing having an open lower end, which is filled with a non-oxidizing or reducing gas and whose lower part of the peripheral wall is immersed in a cooling liquid,
The high-frequency heating coil that heats the work, the lifting device that raises and lowers the high-frequency heating coil, the jacket that sprays the cooling liquid on the work, and the cooling liquid sprayed from the jacket does not hit the work while the high-frequency heating coil is heating the work. A waterproof plate fixed to the high-frequency heating coil, a pump for supplying the cooling liquid to the jacket, and a plurality of valves provided in parallel in the middle of the pipe from the pump to the jacket, and
The high-frequency heating coil and the jacket are installed in the casing, the pump is continuously operated, and at least one valve is always opened to constantly inject the cooling liquid from the jacket, and the other valves are also opened to rapidly cool the work. A non-oxidative quenching device characterized in that the high-frequency heating coil is raised together with the waterproof plate by a lifting device during the period.