JPS59190319A - Adjusting device for flow of hardening bath - Google Patents

Abstract

PURPOSE:To harden uniformly many small parts in the stage of disposing said parts into the hood in a hardening bath, and passing the same through the hardening bath from below to harden the parts by adjusting the space between the hood and the flow regulating duct of the hardening bath below the same. CONSTITUTION:Plural small parts such as tools, gears or the like which are heated to the hardening temp. are put into a vessel in which a hardening bath passes freely. The vessel is immersed into a square cylindrical hood 17 in a hardening bath S of salt, etc. for hardening in a hardening tank 1 by an elevator 9. A flow regulating duct 5 for the bath S is disposed below the same and the bath S is moved upward through a flow regulating duct 5 in the hood 17 by an impeller 8 to cool and harden the materials to be treated. The spacing lbetween the bottom end of the hood 17 and the outlet 5b of the duct 5 is adjusted to let escape a part of the hardening bath in the circumferential edge ascending in the hood to the outside of the hood, by which the ascending flow rate of the hardening bath in the hood 17 is kept the same as the flow rate in the central part and all the materials to be treated in the hood 17 are hardened to uniform quality.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a quenching bath used for carburizing and phosphorizing various tools, gears, etc.

Conventionally, a quenching bath has been provided with a rectifying duct in the quenching tank, a hood fixed to the upper part of the outlet of the quenching duct, and articles to be treated being lowered into a seven-door by an elevator for loading. progress is well known.

The above hood is originally provided to equalize the bath flow inside the hood, but when many gears are being quenched simultaneously, the flow resistance on the outside along the inner wall of the hood is is smaller than the flow resistance in the inner part of the hood, which is arranged in multiple stages. Therefore, the flow velocity in the outer part is faster than the flow velocity in the inner part, and the flow resistance between the gears placed in the outer part and the gears placed in the inner part is smaller. There are problems such as over- or under-quenching, and for large-diameter gears, the cooling rate differs locally, causing thermal distortion, resulting in variations in product quality.

In addition, the difference in the flow velocity of the bath flow between the outer and inner parts of the hood as described above varies depending on the shape of the claws and the number of objects to be processed, such as the size of the diameter of the two parts, so it is important to control the quenching quality. The problem was that it became even more difficult.

The present invention was made to solve this problem, and it is possible to equalize the flow velocity of the bath flow in the hood between the outer part and the inner part of the hood, thereby ensuring that variations in quenching quality are prevented. It is an object of the present invention to provide a bath flow adjustment device for a quenching bath that can prevent such problems.

For this reason, the present invention is capable of wrinkling the distance between the hood and the rectifying duct so that the distance between the hood and the rectifying duct can be adjusted, instead of the conventional liquid forming method in which the hood is fixed to the companion duct. Made in Japan,
A part of the bath flow inside and outside the hood, which has a high flow rate, is released to the outside of the hood through the above-mentioned interval, so that the bath flow velocity in the outer part and the bath flow velocity in the inner part are made almost equal.

The distance between the hood and the outlet may be adjusted depending on the shape and number of objects to be treated so that the bath flow velocity in the outer part of the hood is equal to the bath flow velocity in the inner part. By making the tTf speed of the bath flow uniform, uneven hardening can be reliably prevented.

Hereinafter, the present invention will be described in more detail based on the illustrated embodiment.

In Fig. 1 and 21-1, 1 is a quenching tank installed on a base 2, and inside this quenching tank 1 there is salt S for quenching.
is filled to form a quenching bath 3. In addition, a heater 4 is installed in the quenching bath 1 to maintain the hot dust in the quenching bath 3 at a predetermined temperature, and a bath flow rectifying duct 5 is installed with the bottom part supported on the base 2. ing. this! , i1! is connected to the suction port 5a of each seat duct 5 by a motor 7 installed downwardly on the lid wall 6 of the holding tank 1. Agitator 8 to be moved
The salt S is fed into the rectifying duct 5 by the agitator 8, and an upward bath stream is blown out from the outlet 5b of the flow duct 5.

- Reference numeral 9 is an elevator for causing the workpiece 10 to perspire against the quenching bath 3, and this elevator 9 extends upward through a cut hole 11 provided in the cover wall 6 and is erected on the base 2. It is guided so as to be raised and lowered by an elevator guide 12, and is suspended and supported by a pair of chains 13 and 13. This chain 13.13 changes its direction horizontally with a guide sprocket 14.14, and then connects to a chain w motion device (not shown) such as a cylinder or motor, and drives the chain 13.13 to move the elevator. Raise and lower 9.

In the figure, only the overall outline of the workpiece 10 is shown by imaginary lines, but in actuality, for example, a large number of gears and the like are supported in multiple stages by appropriate drays, and the quenching tank l After being heated under predetermined heating conditions in a heating furnace 16 installed on a conveyance path 15 installed horizontally above, it is loaded onto the elevator 9 in the ascending position, and the air outlet 51 of the rectifying duct 5 is carried by the elevator 9. The cooling hood 17 is lowered to a position inside the rectangular cylinder-shaped cooling hood 17 supported above, and is hardened by the bath stream blown out from the outlet 5b.

The hood 17Nt is guided so as to be vertically displaceable by the elevator guide 12, and a pair of chains 18.1
It is suspended and supported by 8.

This pair of chains 18 and 18 are respectively 'A96
Bracket 2 of support fitting 19 provided along opening 11 of
It is wound around a sprocket 21 which is pivotally supported at the center of the shaft, and then connected to a lockable winding sprocket 23 supported by a bracket 22 on the lid wall 6 so as to be able to unwind one winding. This winding sprocket 23 is, for example, a manual handle 24.
This allows the 7-door 17 to be moved up and down with respect to the air outlet 5b of the rectifying duct 5.

In this case, the 'F edge 17a of the hood 17 and the alignment duct 5
An appropriate spacing l is secured between the outlet 5b of
By allowing a portion of the section to escape out of the hood 17 through said spacing l, the flow velocity in the outer section is reduced. To set this relief cooperation, that is, to set the interval 1, the hood 17 is moved up and down relative to the air outlet 51 of the rectifying duct 5 by sweeping the manual handle 24, and the workpiece 10 is placed inside the hood 17. The outer part (peripheral wall part) and the inner part (
7 when the flow velocity in the central part) becomes almost equal.
- This can be done by stopping the door 17.

This setting can be done empirically, but the optimum interval l may be determined in advance through experiments depending on the shape of the object 10 and the like.

As mentioned above, the hood 17 and the air outlet 5b of the rectifier duct 5
If the temperature is set at 1$7, the velocity distribution of the bath flow passing through the hood 17 will be almost equal between the outer part and the inner part, and the cooling rate for the object to be processed 10 will be uniform. This eliminates the occurrence of uneven quenching.

In the above embodiment, the distance between the hood 17 and the air outlet 5b of the rectifying duct 5 is adjusted by displacing the entire hood 17 in the upward r direction.
As shown in FIG. 1, the lower part 25b of each surface 25H forming the hood 25 is supported by a hinge 26 so as to be openable and closable, and the guide roller 28 is rotatably supported by a bracket 27 fixed to the upper part 2'5C. The lower end of the guided chain 29 is locked to the lower part 25b, and by pulling up or loosening the chain 29, the lower part 25b is opened or closed. It may also be possible to finely adjust the interval between the two.

Further, in the above embodiment, the distance l between the 7-door 17 and the air outlet 5b of the cooling duct 5 is uniformly set for the four sides of the hood 17, but the hood 17 is By making it possible to displace the four surfaces independently of each other, and by providing interlayer adjustment means for individually displacing each surface in the vertical direction, the cooling rate can be increased even for asymmetrically processed objects. It may be possible to make it uniform.

Furthermore, it goes without saying that the present invention is not limited to salt quenching as in the above embodiments, but can also be applied to oil quenching and the like.

As is clear from the above description, although the present invention has a simple structure, it is possible to equalize the flow velocity in the hood, uniformize the cooling rate for all the objects to be processed, and It is possible to achieve uniformity of quality and yield.

[Brief explanation of drawings]

1 and 2 are front side and side longitudinal sectional views, respectively, of a quenching apparatus according to an embodiment of the present invention, and FIG. 3 is a partial perspective view showing a modification of the hood of the above embodiment. . l... Quenching Aρ, 3... Quenching bath, 5... Rectifier duct (5b... Air outlet), 10... Workpiece, 17...
...Hood, 18...Chain, 23...Take-up sprocket, 24...Handle. Patent applicant: Toyo Kogyo Co., Ltd. Agent
Person De-rishi Blue and white 2 members of Sogai Figure 1 Figure 3

Claims (1)

[Claims] (1) In a device for distributing salt from a bath flow rectification duct placed in a quenching tank to a hood provided above the outlet of the rectification duct to harden the material to be treated in the hood, the above-mentioned rectification duct and 1. A bath flow adjustment device for a quenching bath, characterized in that a distance adjustment means is provided for variably increasing the distance between the hood and the bath flow to adjust the flow rate of the bath flow within the hood.