JP2001219210A - Dummy column for bearing inner ring induction heating device - Google Patents

Abstract

(57) [Problem] To provide a dummy column for a bearing inner ring induction heating device which enables continuous use at short intervals. SOLUTION: A dummy column 1 includes a dummy column main body 9.
, A heat shield plate 11, a water supply socket 13 and a drainage socket 15, and a handle 17 as main components.
When heating the fillet ring 41, the fillet ring 41 is fixed to the front end of the induction heating coil 35, while the dummy column 1 is inserted into the hollow portion of the induction heating coil 35. Next, an induction heating coil 35 is supplied from a power supply (not shown).
At the same time as supplying power to the dummy column main body 9 via a water supply hose 45, cooling water from a cooling water source (not shown) is supplied.
To be sent to Then, an induced current is generated inside the fillet ring 41 and the dummy column 1, and both members generate heat due to ohmic loss. However, the temperature rise of the dummy column main body 9 is suppressed by the cooling water flowing therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dummy column used when only a fillet ring is heated by a bearing inner ring induction heating apparatus, and more particularly to a technique which enables continuous use at short intervals.

[0002]

2. Description of the Related Art In a rolling mill for rolling a steel sheet or the like,
In order to withstand large rolling loads, both ends (roll neck) of the roll are supported by double rows (generally four rows) of conical or cylindrical roller bearings. Usually, the inner ring of a roller bearing is
With its inner end surface in contact with the fillet ring fixed to the base end side of the roll neck, it is fastened by a ring nut screwed to the tip side of the roll neck. The inner ring and the fillet ring are often shrink-fitted to the roll neck, but an induction heating device is used for this operation.
The induction heating device is a device mainly composed of a ring-shaped electromagnetic induction coil, and induces a current in an inner ring or a fillet ring, which is a heated object, and causes the heated object to generate heat by ohmic loss.

When a fillet ring is shrink-fitted into or burned out from a roll neck, an induction heating device dedicated to the fillet ring may be used. However, in order to reduce equipment costs and the like, a bearing inner ring having a fillet ring heating function is used. Induction heating devices are often used.
In this apparatus, it is possible to heat only the inner ring (or simultaneously heat the fillet ring and the inner ring) without any problem. However, to heat only the fillet ring, a dummy ring is required. The dummy ring is a steel ring having substantially the same shape as the inner ring, and is heated at the same time as the fillet ring by the bearing inner ring induction heating device.

[0004]

The conventional dummy ring has a problem in that the heating operation of the fillet ring cannot be performed continuously due to the long time required for cooling after heating. Usually, in a rolling mill production line, the mounting process for the rolling rolls differs between the fillet ring and the inner ring. You. Therefore, it is desirable to continuously perform the work of heating the fillet ring. However, when the fillet ring is heated, the temperature of the dummy ring also increases, so that the bearing inner ring induction heating device may be unusable. That is, since the dummy ring has a large heat capacity, its temperature is reduced only gradually, and becomes extremely high when continuously heated, and burns the inner surface of the electromagnetic induction coil of the bearing inner ring induction heating device. In order to prevent this problem, it is necessary to suspend the bearing inner ring induction heating device for a long time after the fillet ring is heated in order to sufficiently lower the temperature of the dummy ring, but there has been a problem that the productivity is significantly reduced. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dummy column for a bearing inner ring induction heating device that enables continuous use at short intervals.

[0005]

According to the present invention, there is provided a dummy column mounted on a bearing inner ring heating device and used for heating only a fillet ring by the bearing inner ring induction heating device. A cylindrical dummy column main body, a cooling water passage formed in the dummy column main body, and cooling provided to the dummy column main body and used for introducing cooling water from an external cooling water source to the cooling water passage. It is proposed to provide a water inlet and a cooling water discharge port attached to the dummy column main body and used for discharging the cooling water from the cooling water passage. According to the present invention, for example,
By introducing cooling water from an external cooling water source into the cooling water passage, overheating of the dummy column during fillet ring heating is prevented, and the cooling time of the dummy column during continuous use is reduced.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of a dummy column for a bearing inner ring induction heating device according to a first embodiment of the present invention, and FIG. 2 is a view taken in the direction of arrow A in FIG. As shown in these figures, the dummy column 1 has a dummy column main body 9 composed of a steel tube barrel 3 and a pair of end plates 5 and 7 that are welded to the front and rear ends of the barrel 3 at their entire circumferences. The heat shield plate 11 bolted to the head plate 5 and the heat shield plate
The main components are a water supply socket 13 and a drain socket 15 protruding at 0 ° intervals, and a steel rod handle 17 welded to the center of the rear end plate 7. In FIG. 1, 1
Reference numerals 9a and 19b denote hose mounting joints screwed into the water supply socket 13 and the drainage socket 15, respectively. Reference numeral 21 denotes a water supply pipe extending from the base end of the water supply socket 13 into the dummy column body 9. The rear end plate 7 has a water supply socket 13 and a drainage socket 15.
Communication holes 25 and 27 are formed in the fixing portions of the water supply pipe 21, respectively, and the base end of the water supply pipe 21 passes through the communication hole 25 and is screwed into the inner periphery of the water supply socket 13.

FIG. 3 is a front view of a bearing inner ring induction heating device (hereinafter abbreviated as a truck additional heating device) with a truck on which a dummy column is mounted, and FIG. 4 is a cross-sectional view taken along line BB in FIG. is there. As shown in these figures, the trolley additional heat device 31
Is a steel plate welded steel product 33 with casters 32 attached to the four corners of the lower surface, an induction heating coil 35 supported on the carriage 33 to be able to move up and down, It is composed of a lifting handle 39 and the like. As shown in FIG.
Is disposed on the front end side (left side in FIG. 4) of the bogie 33. A fillet ring 41 is fixed to a front surface of the bogie 33 by a presser fitting 43, and the dummy column 1 is fitted into the hollow portion. In FIG. 4, reference numeral 45 denotes a water supply hose, which is externally fitted and fixed to the hose mounting joint 19a on the water supply socket 13 side. Reference numeral 47 denotes a drain hose, which is fitted and fixed to the hose mounting joint 19b on the drain socket 15 side.

Hereinafter, the operation of the first embodiment will be described. The operator uses the trolley additional heating device 31 to perform the fillet ring 41.
When the heating is performed, as shown in FIG. 4, the fillet ring 41 is fixed to the front end of the induction heating coil 35, and the dummy column 1 is inserted into the hollow portion of the induction heating coil 35. Next, the operator starts supplying power to the induction heating coil 35 from a power supply device (not shown) and simultaneously supplies cooling water from a cooling water source (not shown) to the dummy column main body 9 via a water supply hose 45. Then, the fillet ring 41
The dummy column 1 generates heat due to ohmic loss due to generation of an induced current therein, but the temperature rise of the dummy column main body 9 is suppressed by the cooling water flowing therein.
The cooling water after the cooling of the dummy column body 9 is drained to a drain passage (not shown) via a drain hose 47.

When the operator confirms that the temperature of the fillet ring 41 has risen sufficiently, the operator turns on the induction heating coil 35.
The power supply to the induction heating coil 35 is stopped, and the dummy column 1 is extracted from the induction heating coil 35 by hand or using a tool. Next, as shown in FIG. 5, the worker moves the trolley additional heat device 31 to the roll neck 53 side of the rolling roll 51,
After the position of the fillet ring 41 and the roll neck 53 is adjusted by operating the lifting handle 39, the fillet ring 41 is fitted over the roll neck 53. next,
The operator operates the presser fitting 43 to operate the fillet ring 4.
1 is released, and the carriage additional heating device 31 is
, Whereby shrink-fitting of the fillet ring 41 to the roll neck 53 is completed.

On the other hand, even after the dummy column 1 is extracted from the trolley additional heat device 31, it is continuously cooled by the cooling water. Therefore, when the fillet ring 41 is heated again, the temperature of the dummy column 1 is sufficiently lowered, and the dummy column 1 does not burn the induction overheating coil 35. Thus, in the present embodiment, the heating of the fillet ring 41 can be continuously performed, and the productivity can be greatly improved as compared with the conventional apparatus.

FIG. 6 is a side view of a bearing inner ring induction heating device (hereinafter simply referred to as a heating device) in which a dummy column according to a second embodiment of the present invention is inserted, and FIG. It is an arrow view. As shown in these figures, the dummy column 1 of the second embodiment also has substantially the same structure as that of the first embodiment, but the handle 17 is welded to the center of the upper end plate 5. I have. Dummy column 1 has floor 6
The water supply hose 45 and the drainage hose 47 are drawn out of the gap between the coil bases 63 and 65.
The induction heating coil 35 according to the second embodiment is of a so-called hanging type, and is conveyed by a factory overhead crane or the like and fitted on the dummy column 1.

The operation of the second embodiment is substantially the same as that of the first embodiment. However, since the dummy column 1 is placed on the floor 61 via the coil bases 63 and 65, the water supply hose 45 and the drain hose are provided. 47, etc., and the heating device 31
Can be simplified and reduced in cost.

Although the description of the specific embodiments has been completed above, the aspects of the present invention are not limited to these embodiments, and the specific shapes and configurations of the dummy column, the heating device, and the like are different from those in the design. It can be changed as appropriate for convenience.

[0014]

As is apparent from the above description, according to the present invention, a dummy column mounted on a bearing inner ring heating device and used when only the fillet ring is heated by the bearing inner ring induction heating device is provided. A cylindrical dummy column main body, a cooling water passage formed in the dummy column main body, and cooling provided to the dummy column main body and used for introducing cooling water from an external cooling water source to the cooling water passage. Since the cooling water passage is provided with a water introduction port and a cooling water discharge port attached to the dummy column main body and used for discharging the cooling water from the cooling water passage, for example, cooling from an external cooling water source is performed in the cooling water passage. By introducing water, overheating of the dummy column during fillet ring heating is prevented, and the cooling time of the dummy column during continuous use is also reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing a dummy column according to a first embodiment of the present invention.

FIG. 2 is a view taken in the direction of the arrow A in FIG.

FIG. 3 is a front view of a bogie-equipped bearing inner ring induction heating device on which a dummy column is mounted.

FIG. 4 is a sectional view taken along line BB in FIG. 3;

FIG. 5 is an explanatory view showing a method of attaching a fillet ring to a roll neck.

FIG. 6 is a side view of a bearing inner ring induction heating device in which a dummy column according to a second embodiment of the present invention is inserted.

FIG. 7 is a view as viewed in the direction of arrow C in FIG. 6;

[Explanation of symbols]

 1 ‥‥ Dummy column 13 ‥‥ Water supply socket 15 ‥‥ Drainage socket 19a, 19b ‥‥ Hose attachment joint 31 ‥‥ Bearing inner ring induction heating device 33 ‥‥ Bogie 35 ‥‥ Induction overheating coil 41 ‥‥ Fillet ring 45 ‥‥ Water supply Hose 47 ‥‥ Drain hose 51 ‥‥ Rolling roll 53 ‥‥ Roll neck 61 ‥‥ Floor 63, 65 ‥‥ Coil stand

Claims (1)

[Claims] 1. A dummy column mounted on a bearing inner ring heating device and used when only the fillet ring is heated by the bearing inner ring induction heating device, comprising: a cylindrical dummy column main body; and a dummy column main body. A cooling water passage formed, a cooling water inlet provided in the dummy column main body, for supplying cooling water from an external cooling water source to the cooling water passage, and a cooling water inlet provided in the dummy column main body; A dummy column for a bearing inner ring induction heating device, comprising: a cooling water discharge port for discharging cooling water from a water passage.