JPH03211223A - Cooling mechanism for forged product in self-heating annealing furnace - Google Patents

Abstract

PURPOSE:To miniaturize the setting space of a vertical type self-heating annealing furnace by putting a forged product in a receiving vessel, conveying to a treating chamber at upper part, descending after slowly cooling and annealing, and blowing through a duct surrounding the above receiving vessel to cool the forged product. CONSTITUTION:Plural receiving vessels 71 are fitted to an endless conveying member 61 engaged with upper and lower sprockets 51, 53. The forged products A are contained into this receiving vessel 71 and intermittently moved to the vertical direction as oval-shape with the above conveying member 61. By this method, the forged product A is conveyed into the treating chamber 31 at the upper part provided with heat insulating material 21, heating sources 41, 42, etc., from an opening zone 32 at lower part and slowly cooled and annealed while utilizing the remaining heat. In the above vertical self-heating annealing furnace, the communicating duct 81 surrounding the receiving vessel 71a at ascending stage and the receiving vessel 71b at descending stage, is provided to the above opening range 32. The blowing is executed from descending side to ascending side or to reverse direction to the above through the duct 81 with a blowing fan 82. By this method, the charged forged product and the annealing forged product are cooled to the suitable temp. in the vertical self-heating annealing furnace having small setting space, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a cooling mechanism in a self-thermal annealing furnace for forged products.

BACKGROUND ART In order to impart machinability such as machinability in a subsequent process to a heated steel forged product, the forged product is annealed using a self-heating annealing furnace. The autothermal annealing furnace generally uses the residual heat of the forged product to slowly cool it at 675-b.

The present invention relates to a self-heating annealing furnace used when annealing a heated steel forging, and particularly to a cooling mechanism in a self-heating annealing furnace whose processing chamber is formed in a vertical shape.

<Prior Art> Conventionally, there are various types of self-heating annealing furnaces used when annealing heated steel forgings, such as a roller hearth type, a walking beam type, a cast link type, and a mesh belt type. All of these have a horizontal processing chamber surrounded by heat insulating material and equipped with a heating source and a fan, and the forged product cooled to 675 to 725°C is heated by rollers and walking in the processing chamber. The forged product is conveyed flatly, for example from left to right, using a conveying means such as a beam, cast link, mesh belt, etc., and the residual heat is used to gradually cool the forged product, and then the forged product is further cooled for convenient handling. It is something to do.

<Problems to be Solved by the Invention> However, in all of the conventional self-heating annealing furnaces as described above, the processing chamber is formed horizontally, and it is difficult to move the #l product from the left to the right, for example. Since the forged product is cooled due to the fact that the forged product is transported in a plane, there is a problem that the installation space as a whole including the cooling means is large.

The present invention solves this problem.

Means for Solving the Problems> The present invention provides a means for solving the problems of forged products installed in a self-heating annealing furnace for annealing forged products in a vertical processing chamber by slowly cooling the forged products using the residual heat of the forged products. A cooling mechanism that is engaged between an upper sprocket installed inside the processing chamber and a lower sprocket externally installed in an open area below the processing chamber, and moves intermittently in an oval shape in the vertical direction. A plurality of receivers for storing the forged products are attached to an endless conveying member, and the open area is equipped with a communication duct surrounding the receivers in the descending stage and the receivers in the ascending stage. the forged product is configured to cool the forged product stored in the receiver by ventilation from the receiver in the descending stage to the receiver in the ascending stage via the duct; A cooling mechanism for a thermal annealing furnace, and a cooling mechanism for a forged product installed in an autothermal annealing furnace for annealing a forged product in a vertical processing chamber by slowly cooling the forged product using its residual heat. An endless conveying member that is engaged between an upper sprocket installed inside the processing chamber and a lower sprocket externally installed in an open area below the processing chamber, and moves intermittently in an oval shape in the vertical direction. A plurality of receivers for storing forgings are installed, and the open area is equipped with a duct surrounding the receivers in the ascending stage, and through the ducts, the forgings are stored in the receivers in the ascending stage. The present invention relates to a cooling mechanism in a self-thermal annealing furnace for a forged product, which is configured to cool the forged product by blowing air from the relatively high-temperature forged product to the relatively low-temperature forged product.

The cooling mechanism in the present invention is applied to a self-heating annealing furnace in which a processing chamber is formed in a vertical shape. In the autothermal annealing furnace, an upper sprocket is housed in a vertically formed processing chamber, and the lower sprocket is externally mounted in an open area at the bottom of the processing chamber, and the upper and lower sprockets are An endless conveying member that moves intermittently in an elliptical shape in the vertical direction is engaged between them, and a plurality of receivers for storing forged products are attached to the conveying member. The open area is equipped with a communication duct surrounding the receiver in the descending stage and the receiver in the ascending stage, or a duct surrounding the receiver in the ascending stage, through which the receiver in the descending stage is connected. Ventilation is carried out from the receiver in the direction of the receiver in the ascending stage or from the high temperature forgings stored in the receiver in the ascending stage to the direction of the low temperature forgings stored in those receivers. It is configured to cool the forged product.

Effects> In the present invention having the above configuration, when one of the upper and lower sprockets is intermittently driven, the plurality of receivers are intermittently moved via the conveying member. Such intermittent movement of multiple receivers is ascent → turning along the upper sprocket → descending → turning along the lower sprocket → rising to the original state, and the above is repeated, resulting in an elliptical intermittent movement in the vertical direction. It becomes a move. Therefore, if a forging is stored in the receiver during the rising stage of the receiver in the open area while the sprocket is stopped, the forging will rise in the processing chamber and rotate along the upper sprocket. In the descending stage, the material is slowly cooled while gradually reducing its residual heat and undergoes a predetermined annealing process. The forging is then removed, for example mechanically or by gravity, during the lowering of the receiver in the open area or during the swivel phase along the lower tin rocket.

Since a heated steel forging is at a high temperature of about 1000° C. immediately after forging, it is necessary to cool the forged product to an appropriate temperature when autothermally annealing the forged product. Further, since the autothermally annealed forged product is at a temperature of about 650° C., it is necessary to cool the forged product to a temperature that is easy to handle.

In the present invention, in the open area, after storing the forged product before autothermal annealing and before transporting the forged product to the processing chamber, the receiver is in the ascending stage and the forged product after autothermal annealing is carried out from the processing chamber. A communication duct is provided that surrounds the receiver in the descending stage and before taking it out, and the direction from the receiver in the descending stage to the receiver in the ascending stage is provided through the communicating duct. It is designed to provide ventilation to the By first blowing cold air to the receiver in the descending stage through the communicating duct, it is possible to cool the autothermally annealed forged product stored in the receiver. When the hot air heated by the cooling is continued to be passed through the receiver in the rising stage, the forged product stored in the receiver before autothermal annealing is heated to a predetermined temperature while preventing overcooling. It can be cooled to

By the way, in many cases, a plurality of forged products are stored in one receiver.The forgings are sequentially transferred to a charging table, and a predetermined number of forged products placed on the charging table are transferred to one receiver. Push it in and store it. In this case, there is a time lag between the first forged product placed on the loading table and the last forged product placed on the loading table, and there is a temperature difference between them. The forged products placed at the beginning are at a relatively low temperature, but the forged items placed at the end remain relatively hot. If such a plurality of forged products are housed in one receiver and the receiver is simply ventilated, it is difficult to uniformly cool the plurality of forged products in preparation for incandescent annealing.

In the present invention, the open area is equipped with a duct that surrounds the receiver in the ascending stage after storing the forged product before autothermal annealing and before transporting the forged product to the processing chamber. It is configured to allow ventilation to flow from the relatively high-temperature forged product stored in the receiver to the relatively low-temperature forged product through the receiver. Through the duct, cold air is first passed through the relatively high-temperature forged product to cool the forged product, and then the heated hot air is sequentially passed through the relatively low-temperature forged product, causing the receiver to cool down. It is possible to uniformly cool a plurality of stored forged products to a predetermined temperature before autothermal annealing.

As mentioned above, a communication duct is installed to first pass cold air to the receiver in the descending stage, and then pass hot air to the receiver in the ascending stage. Needless to say, it is preferable to ventilate the forged product from the product to the relatively low-temperature forged product.

According to the present invention, since the processing chamber is formed in a vertical shape and the forged product is cooled in relation to the vertically conveying the forged product in an elliptical shape, the entire installation including the cooling mechanism is required. This allows the forging to be autothermally annealed as desired while requiring less space.

<Example> Fig. 1 is a vertical sectional view schematically showing an embodiment of the present invention in relation to a self-heating annealing furnace having a vertical processing chamber, and Fig. 2 is a schematic longitudinal sectional view of the embodiment. FIG. A processing chamber 31 is formed in a vertical shape surrounded by a heat insulating material 21 supported by a frame 11, and a heating source 41, 42 and a fan 43 are installed inside the processing chamber 31. The lower part of the outside of the processing chamber 31 is an open area 32, and the upper sprocket 51, 52 (however, the sprocket 52 is not shown, the same applies hereinafter) is installed inside the processing chamber 31, and the open area 32 has an open area 32 inside. sprockets 53 and 54 are mounted on the outside, and in the case of the drawing, the upper tin rocket 51.

52 is the drive sprocket, and the lower sprocket 5
3.54 is a floating sprocket. Endless conveying members 61.62 are engaged between the upper and lower sprockets 51.53 supported on the frame 11, and between the upper and lower sprockets 52.54, respectively.
A plurality of receivers 71 are attached to the receiver 62 at predetermined intervals. The conveying members 61 and 62 and the plurality of receivers 71 are in the processing chamber 31.
The receiver 71 spans the processing chamber 31 and the open area 32 via an inlet 21a and an outlet 21b provided at the bottom of the heat insulating material 21 surrounding the receiver 71, and the outer shape of the receiver 71 is a hexahedral rectangle. Except for the front side, which serves as the entrance and exit of the forged product, there are many punch holes on all four sides.

In the open area 32, the receiver 71a is in the ascending stage after storing the forged product A before autothermal annealing and before it is carried into the processing chamber 31, and the forging product A after autothermal annealing is processed. Room 3
A communication duct 81 surrounding the receiver 71b in the descending stage after being carried out from the frame 11 and before being taken out is provided, and a blower fan 82 is installed on the upstream side of the duct 81 supported by the frame 11. is installed.

When the upper sprockets 51, 52 are driven intermittently, the plurality of receivers 71 are intermittently moved via the conveying members 61, 62. Such intermittent movement of the plurality of receivers 71 is as described above. During the rising stage of the receiver 71 in the open area 32, while the sprockets 51 to 54 are stopped, and thus the receiver 71 is stopped, the self-heat When the forged product A before annealing is pushed into the receiver 71 and stored, the forged product A is sequentially carried into the processing chamber 31 together with the receiver 71 through the entrance 21a, and the receiver 71 rises, rotates, and descends in the processing chamber 31. After being slowly cooled while gradually reducing its own residual heat and undergoing prescribed annealing,
It is carried out together with the receiver 71 from the outlet 21b to the open area 32,
When the receiver 71 rotates in the open area 32, it falls into the packet 92 due to its own weight.

During this time, when the blower fan 82 is driven to blow air into the communication duct 81, the cold air first cools the autothermally annealed forged product A stored in the receiver 71b in the descending stage, thus cooling it. On the contrary, the heated air continues to cool the forged product A, which is stored in the receiver 71a in the ascending stage and has not yet been self-annealed, to a predetermined temperature while preventing the forged product A from being overcooled.

FIG. 3 is an enlarged cross-sectional view schematically showing another embodiment of the present invention corresponding to FIG. 2. Lower sprocket) 57.5
8 and endless conveyance members 63, 64, etc., whose explanation is omitted are the same as in the case of FIG. A duct 83 is equipped to surround the receiver 72a in the rising stage after storing the items a to e and before transporting them to a processing chamber (not shown), and the duct is supported by a frame (not shown). A blower fan 84 is installed upstream of the fan 83 . When the blower fan 84 is driven to blow air into the duct 83, the cold air first cools the relatively high-temperature forged product a, and then gradually cools the relatively low-temperature forged product b→forged product C→forged product d-@forged product e are sequentially cooled. By cooling in this manner, the hot air heated sequentially cools the forged products be, thereby uniformly cooling the plurality of forged products a to a predetermined temperature.

The configuration of the present invention has been explained above based on the illustrated embodiments, but in each embodiment, for example, various heaters, burners, etc. can be used as the heating source, and the conveying member can be engaged with the upper and lower sprockets. A chain can be used, and multiple receivers can be screwed together with bolts and nuts through reinforcing members if necessary on the links of the chain, and a conveyor can be used instead of a packet. can do.

<Effects of the Invention> As is already clear, the present invention described above has the advantage that the installation space can be reduced and the forged product can be autothermally annealed as desired.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view schematically showing an embodiment of the present invention in relation to a self-heating annealing furnace, FIG. 2 is an enlarged cross-sectional view schematically showing the embodiment, and FIG. FIG. 3 is an enlarged cross-sectional view schematically showing another embodiment of the present invention, corresponding to FIG. 11...Frame body, 21...Insulating material 31...Processing chamber, 32...Open area 41.42...Heating source,
43... Fan 51.53, 54, 57.58...
... Sprocket Bt-84 ... Conveyance member 71.72 ... Receiver 81.83 ... Duct, 82.84 ... Air fan ^, a-e ... Forged product

Claims (1)

[Scope of Claims] 1. A cooling mechanism for a forged product installed in a self-heating annealing furnace for annealing the forged product by slowly cooling the forged product in a vertical processing chamber, the cooling mechanism comprising: An endless conveying member that is engaged between an upper sprocket installed inside the processing chamber and a lower sprocket externally installed in an open area below the processing chamber, and moves intermittently in an oval shape in the vertical direction. A plurality of receivers for storing the forgings are installed, and the open area is equipped with a communication duct surrounding the receiver in the descending stage and the receiver in the ascending stage, through which the descending A cooling mechanism in a self-thermal annealing furnace for a forged product, which is configured to cool the forged product stored in the receiver by blowing air from the receiver in the stage to the receiver in the ascending stage. 2. A cooling mechanism for a forged product installed in a self-heating annealing furnace for annealing a forged product in a vertical processing chamber by slowly cooling the forged product using its residual heat, which is installed inside the processing chamber. The plurality of forged products are stored in an endless conveying member that is engaged between an upper sprocket and a lower sprocket that is sheathed in an open area below the processing chamber and that moves intermittently in an oval shape in the vertical direction. A receiver is installed in the open area, and the open area is equipped with a duct surrounding the receiver in the rising stage, through which the relatively hot water contained in the receiver in the rising stage is delivered. A cooling mechanism in a self-thermal annealing furnace for a forged product, which is configured to cool the forged product by blowing air from the forged product toward the relatively low-temperature forged product.