JPH0762170B2 - Cooling device for internal quenching - Google Patents

Description

The present invention relates to an inner surface quenching cooling device used for inner surface quenching of bearings, tie rod ends, and the like.

<Prior art> Inner surface quenching of bearings, tie rod ends, etc.
This is performed by heating the inner surface of the work to be quenched with a high frequency heating coil and then rapidly cooling the inner surface. As a method for rapidly cooling the heated inner surface of the work, the whole work is generally poured into a cooling liquid.

<Problems to be Solved by the Invention> However, in the method of pouring the entire work into the cooling liquid, the cooling liquid may stagnate on the inner surface side of the work,
The quenching time is not well managed. Therefore, uneven cooling is likely to occur. It is possible to spray the cooling liquid on the work, but it is difficult to spray the cooling liquid uniformly on the inner surface of the work while keeping the high-frequency heating coil in the heating position.
Further, when the high-frequency heating coil is moved from the heating position while the cooling liquid is sprayed on the work, a mechanism for moving the high-frequency heating coil is required, which complicates the structure of the induction hardening apparatus. Moreover, since the heating work must be interrupted during cooling in both cases, the work efficiency decreases.

The present invention was devised in view of the above circumstances, and is capable of strongly cooling the heated inner surface of a work evenly, and quenching the inner surface capable of continuing the heating work during the cooling. An object of the present invention is to provide a cooling device for a vehicle.

<Means for Solving the Problems> An inner surface quenching cooling device according to the present invention is supported substantially horizontally above the liquid surface of a cooling liquid contained in a tank, and is rotatable about a rotation axis. At the same time, the pedestal that holds the workpiece by making the axis of the heated inner surface of the workpiece almost vertical and erected on the pedestal, inserted into the workpiece held by the pedestal, and cooled to the heated inner surface It comprises a nozzle for ejecting liquid, and a pedestal drive means for rotating the pedestal around its rotation axis so as to invert the pedestal, and the pedestal drive means comprises a motor and a tip of the pedestal. It has a rotating shaft fixed to the axis of the base and having a base end connected to the motor.

The tank may be disposed adjacent to a high frequency heating device that heats the inner surface of the work.

<Operation> By setting the work whose inner surface is heated on the pedestal, the nozzle is inserted into the work, and the heated inner surface of the work is uniformly and strongly cooled by the cooling liquid ejected from the nozzle. . When the pedestal is inverted by the pedestal driving means, the work on the pedestal falls into the tank, and the rapid cooling of the work is automatically stopped.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings. First
1 is a partially cutaway side view showing an example of an internal quenching cooling device embodying the present invention, FIG. 2 is its plan view, FIG. 3 is a plan view showing the layout of internal quenching equipment, and FIG. It is a side view of a high frequency heating device.

The internal quenching equipment shown here, as shown in FIG.
High-frequency heating device 10 and cooling device 20 arranged on the side thereof
And is used for quenching the inner surface 31 of the work 30, such as a tie rod end.

As shown in FIG. 4, the high frequency heating device 10 has a coil 11 having a size that can be inserted into the inner surface of the work 30. The coil base 12 that supports the coil 11 is supported on a disk-shaped base plate 14 by a plurality of legs 13. Below the base plate 14, electrode plates 15 and 15 for connecting the coil 11 to a high frequency power source,
Water passage pipes 16, 16 for supplying a cooling liquid to the coil 11 are provided in a protruding manner. Reference numeral 17 is an insulating plate that insulates the electrode plates 15 and 15.

As shown in FIGS. 1 and 2, the cooling device 20 arranged on the side of the high-frequency heating device 10 includes a tank 21 and a work 30.
And a forced quenching means for forcibly quenching the heated inner surface 31 of the. Cooling liquid is supplied from the water supply pipe P into the tank 21, and the water surface height of the cooling liquid W in the tank 21 is always kept constant. A belt conveyor B (see FIG. 3) for discharging the work 30 is provided near the bottom of the tank 21.

The forced quenching means includes a mounting member 22 mounted on the side wall of the tank 21 toward the inside, a bearing 23 bolted to the mounting member 22, and a pedestal driving means. The pedestal driving means has a rotary shaft 24 and a motor 29. The rotary shaft 24 is horizontally supported by a bearing 23, and its tip is bolted to the shaft center of the pedestal 25.

A motor 29 is attached to the rear surface of the mounting bracket 22 so as to face the outside of the tank 21. The motor 29 is an air motor or the like, and its output shaft is connected to the base end of the rotary shaft 24.

The pedestal 25 has a disk shape and is supported substantially horizontally above the water surface of the cooling liquid W in the tank 21. An enclosure 28 is attached to the pedestal 25 except for a part on the front side.
A nozzle 26 is vertically penetrated through the center of the pedestal 25. The nozzle 26 has a screw portion 26a in the middle in the axial direction thereof, and the nut 27, 27 is inserted from above and below with the pedestal 25 sandwiched between the screw portion 26a.
Is fixed to the pedestal 25 by being screwed. A large number of nozzle holes 26b are formed in the upper portion of the nozzle 26 so that the cooling liquid is jetted to the periphery. A flexible hose H that supplies a cooling liquid to the nozzle 26 is connected to the lower portion of the nozzle 26.

The work 30 is held on the pedestal 25 by a jig (not shown). The work 30 held on the pedestal 25 has an inner surface 31 whose axis is oriented in the vertical direction, and the upper portion of the nozzle 26 is inserted into the axis. As a result, the inner surface 31 of the work 30 is
It is rapidly cooled by the cooling liquid jetted from the nozzle 26. Cradle
The rapid cooling rate of the work 30 on the 25 is adjusted by the amount of cooling liquid ejected from the nozzle 26. And cradle 25
Is inverted by the rotation of the rotary shaft 24 by 180 degrees by the operation of the motor 29. The operation timing of the motor 29 is
A high-frequency heating device so that the work 30 set in 25 is turned over after the work 30 set on the work 25 has undergone the required rapid cooling on the work 25.
It is set on the basis of 10 operation start or operation end.

That is, if the operation time of the high-frequency heating device 10 is 3 seconds, the time required to set it on the pedestal 25 is 0.6 seconds, and the quenching time of the work 30 on the pedestal 25 is 5 seconds, the operation start standard The motor 29 is activated and the pedestal 25 is inverted after 8.6 seconds from the start of the operation of the high-frequency heating device 10. The inverted pedestal
25 continues to flip back to its original state.

In the above-mentioned inner surface quenching equipment, first, an operator holds the work 30, holds the work 30 on the high-frequency heating device 10, and inserts the coil 11 into the work 30. Next, high frequency heating device
Activate 10. As a result, the surface layer of the inner surface 31 of the work 30 is heated at high frequency. At this time, in the cooling device 20, a predetermined amount of cooling liquid is jetted from the upper part of the nozzle 26 to the surroundings.

When the inner surface 31 of the work 30 is heated to a predetermined temperature, the high frequency heating device 10 automatically stops. And immediately, the cooling device 20
Set the work 30 on the pedestal 25. As a result, the cooling liquid ejected from the upper part of the nozzle 26 to the surroundings collides with the inner surface 31 of the work 30, and the inner surface 31 of the work 30 is rapidly and evenly and rapidly cooled by the cooling liquid. When the inner surface 31 of the work 30 is rapidly cooled for a predetermined time, the motor 29 operates and the pedestal 25 is inverted.
As a result, the work 30 on the pedestal 25 falls into the tank 21 and is immersed in the cooling liquid W in the tank 21. The work 30 immersed in the cooling liquid W is automatically discharged to the outside of the tank 21 by the belt conveyor B. The inverted pedestal 25 is inverted again to prepare for cooling the next work 30.

As described above, in the cooling device 20, since the nozzle 26 is inserted into the work 30, the cooling liquid having a sufficient amount of water is supplied to the inner surface 31 of the work 30, and the inner surface 31 of the work 30 is rapidly and strongly cooled. . Since the cooling device 20 is arranged on the side of the high-frequency heating device 10, the heated work 30 can be set on the pedestal 25 of the cooling device 20 in a short time, and the work 30 can be placed on the pedestal 25 of the cooling device 20. It is not necessary to touch the work 30 after setting.
Therefore, the heating of the next work 30 can be started while the work 30 is being cooled, and the efficiency of the inner surface quenching work is significantly improved. Further, since a work 30 is dropped from the pedestal 25 to the tank 21 and the rapid cooling is automatically stopped after a predetermined time has elapsed from the start of the rapid cooling, the rapid cooling time is strictly controlled.

<Effects of the Invention> As described above, in the case of the cooling apparatus for quenching inner surface according to the present invention, the cooling liquid is sufficiently supplied to the inner surface of the work, and the inner surface of the work is cooled evenly and strongly. Further, since the work is dropped from the receiving table into the tank, the quenching time is strictly controlled. Therefore, there is no risk of uneven cooling. After setting the work on the pedestal, it is not necessary to touch the work, and the heating work of the next work can be started.
Therefore, workability is also good.

When the tank is arranged adjacent to the high-frequency heating device, the heated work can be immediately set on the pedestal of the cooling device, further improving workability.

When the cradle drive means is operated after a predetermined time has elapsed from the start or end of operation of the high-frequency heating device,
The operation of the pedestal drive means becomes unnecessary, and the quenching time can be strictly controlled.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an example of an internal quenching cooling device embodying the present invention, FIG. 2 is its plan view, FIG. 3 is a plan view showing the layout of internal quenching equipment, and FIG. The figure is a side view of the high-frequency heating device. 10 …… High frequency heating device 20 …… Cooling device 21 …… Tank 24 …… Rotating shaft 25 …… Receptor 26 …… Nozzle 29 …… Motor 30 …… Workpiece 31 …… Inner surface W …… Coolant

Claims (2)

[Claims] Claims: 1. A cooling liquid contained in a tank is supported substantially horizontally above the liquid level, is rotatable about a rotation axis, and has the axis of the heated inner surface of the work substantially vertical. A cradle that holds the work, a nozzle that is erected on the cradle, that is inserted into the work that is held by the cradle and that ejects a cooling liquid to the heated inner surface of the cradle, and a cradle that reverses the cradle. A pedestal drive means for rotating the pedestal about its rotation axis, and the pedestal drive means is a motor, and a tip is fixed to an axis of the pedestal and a base end is connected to the motor. An inner quenching cooling device having a rotating shaft. 2. The cooling apparatus for quenching inner surface according to claim 1, wherein the tank is arranged adjacent to a high-frequency heating apparatus for heating the inner surface of the work.