JPH0663020B2 - Self-heating annealing furnace for forged products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a self-heating annealing furnace for forged products.

In order to impart machinability such as machinability in a post process to a forged product of heated steel, the forged product is annealed by using an autothermal annealing furnace. The self-heating annealing furnace generally utilizes the residual heat of the forged product at 675 to 725 ° C.
→ It is to be gradually cooled in the range of 650 ° C.

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

<Prior Art> Conventionally, there are various types such as a roller hearth type, a walking beam type, a cast link type, and a mesh belt type as a self-heating annealing furnace used for annealing a heated steel forging. In each of these, a working chamber surrounded by a heat insulating material and containing a heat source and a fan is formed in a horizontal type, and in the working chamber, a conveying means such as a roller, a walking beam, a cast link, a mesh belt or the like. Then, while the forged product is conveyed planarly from left to right, the forged product is gradually cooled by utilizing the residual heat.

<Problems to be Solved by the Invention> However, the conventional self-heating annealing furnaces described above have a problem that the installation space is large because the working chambers are formed horizontally.

The present invention solves this problem.

<Means for Solving the Problems> However, the present invention is a self-heating annealing furnace for annealing a forged product by gradually cooling it by using its residual heat, which is surrounded by a heat insulating material having an inlet and an outlet. A working chamber containing a heating source is formed vertically, and the working chamber is equipped with an upper sprocket and a lower sprocket facing the inlet, and a shaft of the lower sprocket. A shielding member is wound around the outer periphery of the sprocket in a ring shape so that the outer diameter thereof is about the same as the outer diameter of the lower sprocket, thereby partitioning the working chamber into an upper processing chamber and a lower preparation chamber. An outlet is opened in the preparation chamber, and an endless conveying member having a plurality of receivers for accommodating the forged product is engaged between the upper sprocket and the lower sprocket. By intermittently driving one of the sprockets, Oval shape according to the natural furnace forged article obtained by configured to intermittently move as a whole receiving device via the transmission member.

In the present invention, the working chamber is formed vertically. The working chamber is equipped with an upper sprocket and a lower sprocket relative to the inlet provided in the heat insulating material forming the working chamber. A shield member is wound around the shaft of the lower sprocket in a ring shape such that the outer diameter thereof is about the same as the outer diameter of the lower sprocket, and the working chamber is divided into an upper processing chamber and a lower preparation chamber. And an outlet is opened in the preparation room. An endless conveying member is engaged between the upper and lower sprockets, and a plurality of receivers for accommodating forged products are attached to the conveying member. Therefore, the transfer member and the receiver straddle the upper processing chamber and the lower preparation chamber in the working chamber.

<Operation> In the present invention having the above-described configuration, when one of the upper and lower sprockets is intermittently driven, the plurality of receivers intermittently move via the transport member. The intermittent movement of multiple receivers is ascending → swiveling along the upper sprocket → descending → swiveling along the lower sprocket → ascending to the original state. It will be a move. Therefore, when the forged products are sequentially stored in the corresponding receivers from the inlets formed on the side surfaces of the heat insulating material forming the working chamber while the sprocket is stopped in the rising stage of the receivers, The forged product is gradually cooled while gradually reducing the residual heat of itself in a stage where the receiver is raised, swung, and lowered in the upper processing chamber defined by the working chamber, and is subjected to predetermined annealing. Then, the forged product is opened at the lower part of the heat insulating material forming the working chamber, for example, mechanically or by its own weight, in the descending or turning stage of the receiver in the lower preparation chamber divided into the working chamber. Is taken out from the exit.

According to the present invention, since the working chamber is formed vertically,
Installation space can be reduced. Further, a shielding member that divides the working chamber into an upper processing chamber and a lower preparation chamber is wound around the shaft of a lower sprocket mounted opposite to the inlet. , In order to prevent drafts from the outlet to the inlet that would disturb the atmosphere of the upper processing chamber, the working chamber, in particular the processing chamber located above the lower sprocket, i.e. The temperature distribution in the processing chamber can be improved. When the processing chamber has a relatively small capacity, the internal effect of the fan inside the processing chamber is omitted because the stirring effect can be obtained by the intermittent rise, swivel, and descent of the multiple receivers containing the forged products. Therefore, it is possible to eliminate a wasteful space in the processing chamber. In this case, if the shoulder portion of the processing chamber is inclined or curved downward, useless space in the processing chamber can be further reduced and the temperature distribution in the processing chamber can be improved. In any case, if the upper sprocket is used as a drive sprocket and the lower sprocket is a floating sprocket supported by the drive sprocket via a transport member, thermal expansion of these can be absorbed, which results in smoother smoothness. In addition, safe driving can be achieved.

<Embodiment> FIG. 1 is a side view schematically showing a partial cross section of an embodiment of the present invention. The working chamber 31 is vertically formed by being surrounded by the heat insulating material 21 supported by the frame body 11. The working chamber 31 is internally provided with heating sources 41 and 42 and a fan 43. An inlet 52 having an opening / closing door 51 is provided on the side surface of the working chamber 31, and an outlet 54 having an opening / closing door 53 is provided at the lower portion thereof. The working chamber 31 faces the upper sprocket 61 and the inlet 52. It is equipped with a lower sprocket 62, and in the drawing, the upper sprocket 61 is a drive sprocket and the lower sprocket 62 is a floating sprocket. Upper and lower sprockets 61, 62
Is supported by the frame 11, and the lower sprocket 6
A shield member 63 is wound around the shaft of No. 2 in a ring shape such that the outer diameter thereof is approximately the same as the outer diameter of the sprocket 62, and the working chamber 31 is provided with an upper processing chamber 32 and a lower preparation chamber 33.
The outlet 54 is opened at the bottom of the preparation chamber 33. An endless conveying member 71 is engaged between the upper and lower sprockets 61, 62, and a plurality of receivers 81 having only one side end surface opened are attached to the conveying member 71 at predetermined intervals.

When the upper sprocket 61 is driven intermittently, the plurality of receivers 81 intermittently move via the transport member 7. The intermittent movement of the plurality of receivers 81 is as described above.
While the receiver 81 is in the ascending stage, while the sprockets 61 and 62 are stopped, and thus the receiver 81 is stopped, the opening / closing door 51 is opened and placed on the loading platform 91 from the inlet 52. When the forged product A is pushed into the receiver 81 and stored,
The forged product A is gradually cooled in the processing chamber 32 located above the lower sprocket 62 while gradually lowering its residual heat during the ascending and descending stages of the receiver 81 and the swiveling and descending along the upper sprocket 61. , Undergo predetermined annealing. The forged product A falls from the receiver 81 by its own weight in the turning stage along the lower sprocket 62 of the receiver 81 in the preparatory chamber 33 located below the lower sprocket 62. To the bucket 92. The following is a repeat of the above. A shield member 63 that partitions the working chamber 31 into an upper processing chamber 32 and a lower preparation chamber 33 is wound around the shaft of the lower sprocket 62 in a ring shape.
The temperature distribution in the processing chamber 32 is good in order to prevent drafts from the outlet 54 to the inlet 52 that would disturb the atmosphere. Therefore, the opening / closing doors 51 and 53 can be closed while the temperature of the processing chamber 32 is raised at the start of operation, and the opening / closing door 53 can be left open during normal operation. Opening / closing door 53 when opening / closing door 51
To close the door and open the door 53 on the contrary.
May be closed.

FIG. 2 is a side view of an essential part schematically showing a partial cross section of another embodiment of the present invention. Other configurations, such as the heating sources 44 and 45, the upper sprocket 64, the conveying member 72, and the plurality of receivers 82, whose description is omitted are the same as in the case of FIG. 1, but in this embodiment, the frame 12 is used. The top portion of the heat insulating material 22 supported by the above has a semicircular cross section, so that the shoulder portion of the processing chamber 34 is curved downward, and the processing chamber 34 is not equipped with a fan. This embodiment is particularly suitable for a relatively small self-heating annealing furnace because it can eliminate a wasteful space in the processing chamber 34 and can improve the temperature distribution.

The configuration of the present invention has been described above based on the illustrated embodiments, but in each embodiment, for example, various heaters, burners, etc. can be used as a heating source, and upper and lower sprockets are engaged as a conveying member. A chain can be used, and more than one receiver can be screwed with bolts and nuts through reinforcement members if needed for the links of the chain, and a conveyor can be used instead of the bucket. be able to.

<Effects of the Invention> As is apparent, the present invention described above has an effect that the installation space can be reduced and that it is particularly suitable for a relatively small self-heating annealing furnace.

[Brief description of drawings]

FIG. 1 is a side view schematically showing an embodiment of the present invention in a partial cross section, and FIG. 2 is a side view of a main part schematically showing another embodiment of the present invention in a partial cross section. 11, 12 ... Frame body 21, 22 ... Insulation material 31 ... Working chamber, 32, 34 ... Processing chamber, 33 ... Preparation chamber 41, 42, 44, 45 ... Heating source, 43 ... Fan 51, 53 ... Opening / closing door, 52 ... Inlet, 54 ... Outlet 61, 62, 64 ... Sprocket, 63 ... Shielding member 71, 72 ... Conveying member, 81, 82 ... Receiver, A ...
Forged products

Claims (4)

[Claims] 1. A self-heating annealing furnace for annealing a forged product by gradually cooling it by using its residual heat, wherein a working chamber surrounded by a heat insulating material having an inlet and an outlet and equipped with a heating source is provided. It is formed in a vertical shape, and the working chamber is equipped with an upper sprocket and a lower sprocket facing the inlet, and a shielding member has an outer diameter around the shaft of the lower sprocket. The working chamber is wound in a ring shape to the same extent as the outer diameter of the lower sprocket to divide the working chamber into an upper processing chamber and a lower preparation chamber, and an outlet is opened in the preparation chamber. Between the upper sprocket and the lower sprocket, an endless conveying member having a plurality of receivers for accommodating the forged product is engaged, and by intermittently driving one of the sprockets. Oval as a whole with the receiver via the transport member Autothermal annealing furnace forged article obtained by configured to intermittently move to. 2. The self-heating annealing furnace for a forged product according to claim 1, wherein the upper sprocket is a drive sprocket and the lower sprocket is a floating sprocket supported by the drive sprocket via a conveying member. 3. The self-heating annealing furnace for a forged product according to claim 1, wherein the processing chamber is equipped with a fan. 4. The self-heating annealing furnace for a forged product according to claim 1, 2 or 3, wherein a shoulder of the processing chamber is inclined or curved downward.