JP3545265B2 - Cooling mechanism used in induction hardening apparatus and induction hardening apparatus using this cooling mechanism - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cooling mechanism of an induction hardening device used for induction hardening and an induction hardening device using the cooling mechanism.
[0002]
[Prior art]
An ordinary induction hardening apparatus has a high-frequency heating coil for heating a work, and a cooling mechanism for jetting a cooling liquid onto the work heated by the high-frequency heating coil to cool the work. Among these, the cooling mechanism has a cooling jacket provided facing the work, supply means such as a pump for supplying a cooling liquid to the cooling jacket, and piping connecting the cooling jacket and the supply means. ing.
[0003]
After the work is heated by the high-frequency heating coil, the work is subjected to high-frequency quenching by receiving a cooling liquid injected from the cooling jacket.
[0004]
[Problems to be solved by the invention]
However, the conventional induction hardening apparatus has the following problems. First, the cooling liquid remaining in the cooling jacket from which the cooling liquid has been injected decreases as time passes. For this reason, if the processing cycle of induction hardening for a series of works including setting, heating, and cooling of the work is constant , the coolant remaining in the cooling jacket at the end of heating of the work is always constant. However, since the work is manually set, the time required for setting varies, and the cooling liquid remaining in the cooling jacket does not become constant at the end of heating the work .
[0005]
Time lag until the amount of the coolant remaining in the cooling jacket If it is random, even heating is started the supply means such as a pump immediately after the end of the cooling liquid is injected actually into the work Becomes random. For example, in the case of a work called a fine object having a diameter of about 6 to 10 mm, if the time lag is shifted by 5/100 seconds, the depth of a hardened layer formed by induction hardening is shifted. This is because the small object has a small volume, and the degree of progress of heating by heat remaining in the work is large.
[0006]
The present invention relates to a cooling mechanism used in an induction hardening apparatus capable of coping with an induction hardening in which a processing cycle is not constant, such as setting a work by hand, and an induction hardening apparatus using the cooling mechanism. It is intended to provide.
[0007]
[Means for Solving the Problems]
The cooling mechanism used in the induction hardening device according to the present invention is a cooling mechanism used in the high-frequency heating device, and starts injection of cooling liquid from the cooling jacket before starting heating the work with the high-frequency heating coil, At the same time as the heating of the workpiece by the high-frequency heating coil, before the start of the heating or after the start of the heating, the first injection for stopping the injection of the cooling liquid is performed, whereby the cooling liquid in the cooling jacket at the completion of the first injection is discharged. The remaining amount is set to be constant each time, and the second injection is performed to cool the work heated by the high-frequency heating coil when a predetermined time has elapsed from the stop of the first injection .
[0008]
Further, the induction hardening apparatus according to the present invention includes a high-frequency heating coil for heating the work, and a cooling mechanism for injecting a cooling liquid onto the work heated by the high-frequency heating coil, and the cooling mechanism includes: Before the heating of the work by the high-frequency heating coil is started, the injection of the coolant is started from the cooling jacket, and simultaneously with the start of the heating of the work by the high-frequency heating coil, the injection of the cooling liquid is stopped before the start of the heating or after the start of the heating. And the remaining amount of the cooling liquid in the cooling jacket at the time of completion of the first injection is kept constant each time, and when a certain time has elapsed from the stop of the first injection, the coolant is heated by the high-frequency heating coil. The second injection is performed in order to cool the work that has been damaged .
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a time chart showing an operation cycle of a cooling mechanism and an induction heating coil of the induction hardening apparatus according to the embodiment of the present invention, and FIG. 2 is a schematic configuration of the induction hardening apparatus according to the embodiment of the present invention. FIG.
[0010]
The induction hardening apparatus according to the embodiment of the present invention includes a work support mechanism (not shown) that supports the work W, a high-frequency heating coil 200 that heats the work W supported by the work support mechanism with a high frequency, And a cooling mechanism 100 for cooling the work W heated by the heating coil 200.
[0011]
The work support mechanism is configured to support both ends of a shaft-shaped work W having a diameter of about 6 to 10 mm, which is called a thin object, and to rotate the work W. Here, the reason why the work W is rotated is to uniformly heat the work W.
[0012]
The high-frequency heating coil 200 is generally called a semi-open saddle coil, and is set so as to cover the upper half of the work W. By supplying a high-frequency current from a high-frequency power supply (not shown) to the high-frequency heating coil 200, the work W is heated.
[0013]
Further, a cooling mechanism 100 constituting a main part of the induction hardening apparatus according to the embodiment of the present invention includes a pair of cooling jackets 110 provided with work W interposed therebetween, and a cooling It has a supply means 120 such as a pump for supplying a liquid, and a pipe 130 connecting between the cooling jacket 110 and the supply means 120.
[0014]
The cooling jacket 110 is formed in a substantially box shape, and has a plurality of injection holes through which a cooling liquid is injected on a surface facing the work W. Further, inside the cooling jacket 110, a pressure equalizing plate is provided for equalizing the flow of the supplied cooling liquid toward the injection hole and for equalizing the pressure of the cooling liquid injected from the injection hole. I have.
[0015]
As the supply means 120, a storage tank provided at a position higher than the cooling jacket 110 may be used in addition to the pump. In the case of using the storage tank, the coolant is injected from the cooling jacket 110 by utilizing the difference in the head. The type of the supply means 120 is not limited, as long as it can inject the cooling liquid from the cooling jacket 110, other than those described above.
[0016]
The piping 130 is provided with a solenoid bubble 131. That is, the injection of the coolant is controlled by opening and closing the solenoid valve 131.
[0017]
The operation cycle of the cooling mechanism 100 configured as described above and the operation cycle of the high-frequency heating coil 200 will be described with reference to FIG. In this case, the setting of the work W on the work support mechanism is performed manually.
First, it sets the workpiece supporting mechanism of the workpiece W during the 0 to T _1. Of time this 0~T ₁ is, and for a time sufficient to set the workpiece W to the workpiece support mechanism.
[0018]
Next, a first injection A for injecting the cooling liquid is performed between T1 and T2, that is, before the high frequency heating of the work W is started. This first injection A is not intended to inject the cooling liquid to the work W, but to make the remaining amount of the cooling liquid in the cooling jacket 110 constant every time the first injection A is completed. It is done in. The coolant in the cooling jacket 110 leaks from the injection port from the end point of the second injection B to be described later to the end point of the setting of the work W to be hardened next, and the remaining amount decreases at a constant speed. However, since the coolant is supplied into the cooling jacket 110 and the first injection A is performed before the high frequency heating of the workpiece W is started, the first injection A is performed even if the work setting time 0 to T1 varies. Is completed, the remaining amount of the cooling liquid in the cooling jacket 110 is always constant. Therefore, in the first injection A, it is not necessary to allow the coolant to impinge on the work W as in a second injection B described later. However, changing the momentum of the injection between the first injection A and the second injection B imposes a burden on the supply unit 120. Therefore, it is preferable to make the momentum of the first injection A and the second injection B the same. Is desirable.
[0019]
End the same time of the first injection A, i.e. starting heating of the workpiece W by the high-frequency heating coil 200 as they become T _2. The heating time of the workpiece W by the high frequency heating coil 200 _is assumed to be T 2 through T _3.
[0020]
Next, at the same time when the heating of the work W is completed, that is, at the time when the temperature reaches T3, the second injection B is performed to cool the work W. Here, the time (T2 to T3) from the end of the first injection A to the start of the second injection B is the heating time of the work W, and is constant as long as the work W is the same. Moreover, as described above, at the end of the first injection A, the remaining amount of the cooling liquid in the cooling jacket 110 is always constant by the first injection A. Therefore, the amount of the coolant remaining in the cooling jacket 110 at the start of the second injection B (T3) is the same every time. Accordingly, the time from when the supply means 120 is started for the second injection B to when the coolant is actually injected to the work W is also constant every time.
[0021]
From the end of the second injection B is at T _4, remove the workpiece W from the work support mechanism until T ₅ in which the first injection A the following is started, and sets a new workpiece W. The first injection A the following is started from T _5. Then, high-frequency heating coil 110 by heat of a new workpiece W from T ₆ is started.
[0022]
The work W is induction hardened by repeating such an operation cycle.
[0023]
Here, the induction hardening device according to the embodiment of the present invention is superior to the conventional device in the following points.
First, if the work W is set on the work supporting mechanism manually without performing the first injection A as in the related art, the time required for the setting is different every time even for a skilled operator. Therefore, the time from the previous injection of the cooling liquid, ie, the injection of the cooling liquid for cooling the previous work W to the injection of the cooling liquid for cooling the current work W, differs. This means that the time from when the supply unit is started to inject the cooling liquid for cooling the work W to when the cooling liquid is actually injected into the work W is different.
[0024]
However, in the induction hardening apparatus according to the embodiment of the present invention, the first injection A is performed, and the time from the end of the first injection A to the start of the second injection B is constant each time, so that the conventional injection quenching apparatus is not used. No major problems arise.
[0025]
In the above-described embodiment, the end of the first injection A and the start of the heating by the high-frequency heating coil 110 are set at the same time. However, depending on the type of the work W, the heating is performed after or before the start of the first injection A. May be performed. However, even in that case, it is important that the time required from the end of the first injection A to the start of the second injection B is always constant.
[0026]
In the above-described embodiment, the end of the heating and the start of the second injection B are set at the same time. However, depending on the type of the workpiece W, the second injection B is started before or after the end of the heating. Is also good. However, even in that case, it is important that the time required from the end of the first injection A to the start of the second injection B is always constant.
[0027]
【The invention's effect】
The cooling mechanism used in the induction hardening device according to the present invention is a cooling mechanism used in the high-frequency heating device, and starts injection of cooling liquid from the cooling jacket before starting heating the work with the high-frequency heating coil, At the same time as the heating of the workpiece by the high-frequency heating coil, before the start of the heating or after the start of the heating, the first injection for stopping the injection of the cooling liquid is performed, whereby the cooling liquid in the cooling jacket at the completion of the first injection is discharged. The remaining amount is set to be constant each time, and the second injection is performed to cool the work heated by the high-frequency heating coil when a predetermined time has elapsed from the stop of the first injection .
[0028]
For example, when the work is set on the work supporting mechanism manually without performing the first injection as in the related art, the time required for the setting is different even for a skilled operator every time. Therefore, the time from the previous injection of the cooling liquid, that is, the time from the injection of the cooling liquid for cooling the previous work to the injection of the cooling liquid for cooling the current work, differs. This means that the time from when the supply means is started to inject the coolant for cooling the work to when the coolant is actually ejected to the work is different. However, in the induction hardening apparatus according to the present invention, the first injection is performed, and the time from the end of the first injection to the start of the second injection is constant each time. The time until the coolant is sprayed on the work is always constant.
[0029]
For this reason, if the time from the start of the supply means to the time when the coolant is actually sprayed onto the work is shifted by 5/100 seconds, the diameter of the hardened layer formed by induction hardening is shifted. Can accurately form a hardened layer even if the work is a thin object having a thickness of about 6 to 10 mm.
[0030]
Further, the induction hardening apparatus according to the present invention includes a high-frequency heating coil for heating the work, and a cooling mechanism for injecting a cooling liquid onto the work heated by the high-frequency heating coil, and the cooling mechanism includes: Before the heating of the work by the high-frequency heating coil is started, the injection of the coolant is started from the cooling jacket, and simultaneously with the start of the heating of the work by the high-frequency heating coil, the injection of the cooling liquid is stopped before the start of the heating or after the start of the heating. And the remaining amount of the cooling liquid in the cooling jacket at the time of completion of the first injection is kept constant each time, and when a certain time has elapsed from the stop of the first injection, the coolant is heated by the high-frequency heating coil. The second injection is performed in order to cool the work that has been damaged .
[0031]
Therefore, this induction hardening device can also obtain the same effects as described above.
[Brief description of the drawings]
FIG. 1 is a time chart showing an operation cycle of a cooling mechanism and an induction heating coil of an induction hardening apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of an induction hardening device according to an embodiment of the present invention.
[Explanation of symbols]
100 Cooling mechanism A First injection B Second injection

Claims (2)

In the cooling mechanism used in the high-frequency heating device, before starting the heating of the work by the high-frequency heating coil, the injection of the cooling liquid from the cooling jacket is started, and simultaneously with the start of the heating of the work by the high-frequency heating coil, before the start of the heating or After the start of the heating, the first injection for stopping the injection of the cooling liquid is performed, whereby the remaining amount of the cooling liquid in the cooling jacket at the time when the first injection is completed is kept constant every time, and a certain time has elapsed since the first injection was stopped. A cooling mechanism used in the induction hardening device, wherein a second injection is performed at a time when the work heated by the high frequency heating coil is cooled. A high-frequency heating coil for heating the work, and a cooling mechanism for injecting a cooling liquid onto the work heated by the high-frequency heating coil are provided, and the cooling mechanism is used to start heating the work with the high-frequency heating coil. start the injection of the cooling liquid from the cooling jacket, simultaneously with the start of the heating of the workpiece by the high-frequency heating coil, performs a first injection to stop injection of the cooling liquid after the start of the start prior to or heating of the heating, whereby the first injection The remaining amount of the coolant in the cooling jacket at the time of completion is kept constant every time, and a second injection is performed to cool the work heated by the high-frequency heating coil when a certain time has elapsed since the stop of the first injection. induction hardening apparatus characterized that it is so.

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