JPS5835642Y2 - Quenching equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a quenching device for rapidly cooling a heat-treated product with a quenching liquid such as water or oil, and more particularly to a device for uniformly and efficiently quenching a heat-treated product.

In the quenching process, it is necessary to rapidly and uniformly cool the product that has been heated to a predetermined temperature, and the quality of the quenching process is an important point in determining the quality of the product.

Conventionally, the heat-treated material is simply immersed in the quenching liquid in a tank, but since the quenching liquid absorbs the heat of the heat-treated material and rapidly raises its temperature, it is necessary to soak the quenching liquid in order to ensure a sufficient cooling rate. It was necessary to increase the heat storage capacity of the machine, and a large amount of quenching fluid was used.

Furthermore, since convection occurs in the quenching tank and the temperature rises faster in the upper layer, a temperature gradient occurs between the lower and upper layers, causing uneven quenching.

In addition, in order to shorten the quenching speed, a circulation method is known in which the heated quenching liquid is extracted from the upper layer, cooled, and returned to the tank, but the cooled quenching liquid hits the heat-treated product directly when being returned. This area is locally cooled, and when the heat-treated product is a large product, a temperature gradient is created between the introduction side and the back side, causing excessive quenching distortion.

In order to prevent uneven quenching, there is a method of rotating the heat-treated material in a quenching tank, but it is extremely difficult to rotate a large-sized material and requires large-scale equipment.

The inventors of the present invention have focused on the above-mentioned circumstances and have been conducting research with the aim of developing a quenching device that can cool heat-treated objects as uniformly as possible within a short period of time.

The present invention was completed as a result of such research, and includes a circulation pump that extracts the quenching liquid from the upper part of the quenching tank, a cooler that cools the extracted quenching liquid, and a cooler that cools the quenching liquid that is extracted from the bottom of the quenching tank. This quenching apparatus is equipped with a diffusion introduction device that introduces the quenching fluid while diffusing it upward from the quenching fluid, and the diffusion introduction device is located directly above a nozzle for ejecting quenching fluid and is movable up and down concentrically with the nozzle. holds a quenching liquid diffusion member, and the quenching liquid diffusion member has upper and lower surfaces formed in a conical shape, fins are formed on the lower conical surface, and the maximum outer diameter is the same as the inner diameter of the nozzle. The gist lies in the fact that it is a larger version.

The configuration and effects of the present invention will be explained below based on drawings showing embodiments, but the drawings are representative examples and are not intended to limit the invention. All modifications are included within the scope of this invention.

FIG. 1 is a schematic explanatory diagram showing an embodiment of the present invention, in which a quenching liquid extraction pipe 2 is arranged above a quenching tank 1, and after a quenching liquid 3 is extracted by a circulation pump 4, it is cooled by a cooler 5. The heat-treated material 7 is returned to the bottom of the quenching tank 1 and introduced while being diffused upward through the diffusion introduction device 6, thereby uniformly cooling the heat-treated material 7 from the lower part.

The diffusion introduction device 6 is shown in FIG. 2 (partially cutaway diagram), for example.
It is constructed as shown in FIG. 3 (longitudinal sectional view) and FIG. 4 (plan view).

That is, a quenching liquid diffusion member (hereinafter referred to as a float) 9 having conical upper and lower surfaces is arranged directly above the nozzle 8 that opens upward.

The lower conical surface of the float 9 has linear fins 1 extending radially from the lowest point of the float 9 along the lower conical surface.
3a is provided.

Furthermore, by fixing supports 10 at several locations (four locations in the figure) on the outer periphery of the nozzle 8, making the upper part protrude beyond the open end of the nozzle 8, and bending the upper end inward, the float 9 is Hold it so that it does not escape from directly above the nozzle 8.

In addition, the float 9 of the upper end bent portion 10a of the support 10
The contact portion with the nozzle 8 has an inclined surface substantially equal to the inclination angle α of the upper surface of the float 9, so that the float 9 is held substantially concentrically with the nozzle 8.

Moreover, the outer diameter L9 of the float 9 is made larger than the inner diameter L8 of the nozzle 8, so that all of the quenching liquid introduced from the nozzle 8 is applied to the float 9 and diffused.

Further, a short tube 11 is fixed to the outer peripheral side of the support 10.

Therefore, the quenching liquid introduced into the diffusion introduction device 6 from the return pipe 12 is directed upward by the nozzle 8, and then hits the float 9, where it is almost uniformly dispersed in the radial direction along the lower surface of the inverted conical shape. It is introduced into tank 1.

Since this diffusion upward flow B is uniformly dispersed in the quenching liquid 3 on the outer peripheral side of the heat-treated object 7, the heat-treated object 7 can be uniformly quenched.

Moreover, the quenching liquid 3 whose temperature has increased by taking away the heat from the heat-treated material 7,
Since the quenching liquid 3 is rapidly pushed upward by the diffusion upward flow B and then extracted from the extraction tube 2, the quenching liquid 3 in the tank 1 is maintained at as low a temperature as possible, allowing the quenching effect to be fully exhibited.

Furthermore, the cooled quenching liquid is introduced in a diffused state, so
Since there is no risk that the introduced flow will directly hit the heat-treated material 7, there is no risk of causing uneven quenching.

It is necessary to prevent the diffusion flow from the device 6 from hitting the heat-treated material 7 directly, but the direction of this introduction can be changed by changing the angle θ (Fig. 3) of the inverted cone formed on the lower surface of the float 9. It can be easily adjusted by

The short pipe 11 functions to prevent part of the diffusion upward flow B from being dispersed around the bottom of the tank 1.

FIG. 5 is a longitudinal sectional view showing another example of the diffusion introduction device 6, in which spiral fins 13 are provided on the lower surface of the float 9.

If such a float 9 is used, the diffusion upward flow will form a swirling flow around the heat-treated object 7, and the diffusion of the cold quenching liquid can be further promoted.

In addition, when using the float 9 with such a structure, the nozzle 8
When the float 9 rotates due to the flow introduced from the float 9, the contact portion between the float 9 and the support 10 may be worn out. However, as shown in FIG. It is preferable to prevent rotation by engaging the tip of the support) 10.

In the present invention, a diffusion introducing device as shown in Figs. 2 to 5 above is used, but this device may be any device as long as it has the function of introducing the cooled quenching liquid into the quenching tank in a diffused state. In addition to the illustrated example, various other structures can be used as long as they can perform the latching function.

That is, in the figure, the introduced flow is diffused by the float 9, but instead of the float 9, an inverted cone-shaped or disk-shaped diffusion member is fixed above the nozzle 8 with a support to diffuse the introduced flow. Of course, it is also possible to do so.

In addition, if the heat-treated product is cylindrical, the upward diffusion flow should also be directed toward the inner wall, and if a large number of small heat-treated products are immersed and quenched at the same time, it should be directed in the cross-sectional direction of the quenching tank. The design should be such that a uniform upward diffusion flow is formed over the entire area.

Moreover, when the quenching tank is large-sized, a plurality of diffusion introducing devices can be arranged to increase the diffusion efficiency.

The present invention is roughly constructed as described above, but the key point is that the quenching liquid is drawn out from the top of the quenching tank, cooled, and introduced from the bottom of the tank while being diffused upwards. Now you can enjoy a variety of benefits.

■ The cooled quenching liquid forms a diffusion upward flow and quickly diffuses into the quenching liquid in the tank, so the temperature of the quenching liquid can be maintained at a low temperature and the quenching effect is fully exerted.

■ Since the quenching liquid is introduced from the bottom in a diffused state, there is no risk that the heat-treated product will be locally quenched or distorted due to temperature gradients, and high-quality products with no uneven quenching can be obtained.

- The quenching liquid, which has increased in temperature by taking away the heat from the heat-treated product, is mixed with the quenching liquid returned from the bottom, pushed up, and then extracted by the circulation pump, so the temperature gradient in the vertical direction is also extremely small.

■ Since the system circulates the heated quenching fluid while cooling it, less quenching fluid is required, making it possible to make the quenching tank more compact.

[Brief explanation of the drawing]

Fig. 1 is a schematic overall view illustrating the quenching device of the present invention, Figs. 2 to 5 illustrate the diffusion introduction device used in the present invention, Fig. 2 is a partially cutaway diagram, and Fig. 3.5 is a longitudinal sectional view, and FIG. 4 is a plan view. FIG. 6 is a sketch illustrating a float attached to the diffusion introduction device. 1...Quenching tank, 2...Extraction pipe,
4...Circulation pump, 5...Cooler, 6
... Diffusion introduction device, 7 ... Heat treated product,
8...Nozzle, 9...Float, 10
...Support, 11...Short pipe, 12.
...Return pipe.

Claims (1)

[Scope of utility model registration request] A circulation pump that extracts the quenching liquid from the top of the quenching tank, a cooler that cools the extracted quenching liquid, and a diffusion introduction device that diffuses and introduces the cooled quenching liquid upward from the bottom of the quenching tank. The quenching device is equipped with a quenching fluid dispersing member, which is provided with a quenching fluid dispersion member directly above a quenching fluid spouting nozzle so as to be movable up and down concentrically with the nozzle. A quenching device characterized in that the quenching liquid diffusion member has upper and lower surfaces formed in a conical shape, fins are formed on the lower conical surface, and the maximum outer diameter is larger than the inner diameter of the nozzle. .