JPH03211221A - Self-heating annealing furnace for forged product - Google Patents

Abstract

PURPOSE:To miniaturize the setting space of a self-heating annealing furnace for forged product by intermittently moving the forged product contained in a receiving vessel through an endless conveying member engaging with between upper and lower sprockets in a vertical operating chamber building-in a heating source. CONSTITUTION:The operating chamber 31 surrounded with heat insulating material 21 arranged in a frame body 11, provided with the heating source 42 and if necessary a fan 43 and having an inlet 52 and outlet 54, is formed to the vertical type. In this operating chamber 31, a driving sprocket 61 at upper side and a following sprocket 62 at lower side are arranged and plural receiving vessels 81 are fitted to the endless conveying member 71 engaging with the above sprockets. Further, shielding member 63 is wound around a shaft of the lower side sprocket 62, and the above operating chamber 31 is partitioned into a treating chamber 32 and a preparing chamber 33, and invasion of the outer air from the outlet 54 is restrained. The forged product A conveyed from the above inlet 52 is contained into the receiving vessel 81 and intermittently moved in the operating chamber 31 through the conveying member 71 by driving the sprocket 61. By this method, the forged product A is discharged from the outlet 54 in the preparing chamber 33 after annealing by slowly cooling while utilizing this remaining heat in the treating chamber 32.

Description

[Detailed description of the invention] Industrial application fields> The present invention relates to 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 for annealing heated steel forgings, and particularly to a self-heating annealing furnace whose working 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 systems have a horizontal working chamber surrounded by heat insulating material and equipped with a heating source and a fan. The forged product is conveyed in a plane from the left to the right, for example, and the forged product is slowly cooled using its residual heat.

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

The present invention solves this problem.

Means for Solving the Problems> The present invention provides a self-heating annealing furnace for annealing a forged product by slow cooling using its residual heat, the furnace being surrounded by a heat insulating material having an inlet and an outlet. In addition, the working chamber in which the heating source is housed is formed in a vertical shape, and the working chamber is equipped with an upper sprocket and a lower sprocket opposite to the inlet, and the shaft of the lower sprocket is disposed in the working chamber. is wrapped with a shielding member that divides the working chamber into an upper processing chamber and a lower preparation chamber, and between the upper sprocket and the lower sprocket, the forged An endless conveyor member to which a plurality of receivers for storing items are attached is engaged, and by intermittently driving one of the sprockets, the receivers as a whole are intermittently moved in an elliptical shape via the conveyor member. This relates to a self-thermal annealing furnace for forged products, which is basically configured to

In the present invention, the working chamber is formed in a vertical shape. The working chamber is equipped with an upper sprocket and a lower sprocket facing an inlet formed in the insulation material forming the working chamber, and the working chamber is disposed around the shaft of the lower sprocket. A shielding member is wrapped around the forging to separate it into an upper processing chamber and a lower preparation chamber, and an endless conveying member is engaged between the upper and lower sprockets, and the forging is stored in the conveying member. Multiple receivers are installed. Therefore, the conveying member and the receiver straddle the upper processing chamber and the lower preparation chamber in the working chamber.

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. Overall, it is an elliptical intermittent movement in the vertical direction. It becomes a move. Therefore, while the sprocket is stopped during the rising stage of the receivers, if the forgings are sequentially stored into the corresponding receivers from the inlet opened on the side of the heat insulating material forming the working chamber, the The forged product is slowly cooled while gradually reducing its own residual heat during the ascent, rotation, and descent stages of the receiver in the upper processing chamber divided into the working chamber, and undergoes a predetermined annealing. The forging is then opened, for example mechanically or by its own weight, in the lower part of the insulation forming the working chamber during the lowering or pivoting stage of the receiver in the lower preparation chamber partitioned into the working chamber. It is taken out from the exit where it is located.

According to the present invention, since the working chamber is formed in a vertical shape,
Installation space can be reduced. In addition, a shielding member is wrapped around the shaft of a lower sprocket installed opposite the inlet to divide the working chamber into an upper processing chamber and a lower preparation chamber. In order to prevent draft from the outlet to the inlet, it is possible to improve the temperature distribution in the working chamber, particularly in the processing chamber located above the lower sprocket, that is, the processing chamber in which the forged product is autothermally annealed. If the processing chamber has a relatively small capacity,
Since a stirring effect is obtained by the intermittent lifting, rotation, and lowering of multiple receivers containing forged products, it is possible to omit the installation of a fan in the processing chamber, thereby eliminating wasted space in the processing chamber. I can do it. In this case, by sloping or curving the shoulder portion of the processing chamber downward, it is possible to further eliminate wasted space in the processing chamber and improve the temperature distribution in the processing chamber.

In either case, if the upper sprocket is a driving sprocket and the lower sprocket is a floating sprocket supported by the driving sprocket via a conveying member, the thermal expansion of these can be absorbed.
It is possible to achieve smoother and safer driving.

<Embodiment> FIG. 1 is a side view schematically showing an embodiment of the present invention, partially in section. A working chamber 31 is formed in a vertical shape by being 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 working chamber 31. An inlet 52 with an opening/closing door 51 and an outlet 54 with an opening/closing door 53 are opened in the lower part, and the working chamber 31 has an upper sprocket 61 and a lower sprocket 62 opposite to the inlet 52. In the drawing, the upper sprocket 61 is the driving sprocket, and the lower sprocket 62 is the floating sprocket. Upper and lower sprockets) 61.62
is supported by the frame 11, and the lower sprocket 6
A shielding member 63 is wound around the shaft of No. 2 in a ring shape to partition the working chamber 31 into an upper processing chamber 32 and a lower preparation chamber 33. An endless conveying member 71 is engaged between the upper and lower sprockets 61 and 62, and a plurality of receivers 81 with only one side end surface open are attached to the conveying member 71 at predetermined intervals.

When the upper sprocket 61 is driven intermittently, the plurality of receivers 81 are intermittently moved via the conveying member 71. Such intermittent movement of the plurality of receivers 81 is as described above. During the rising stage of the receiver 81, while the sprockets 61 and 62 are stopped, and thus the receiver 81 is stopped, the opening/closing door 51 is opened and the load is loaded from the inlet 52 onto the charging table 91. When the forged product A is pushed into the receiver 81 and stored,
The forged product A is slowly cooled in the processing chamber 32 located above the lower sprocket 62 while gradually reducing its residual heat during the ascent of the receiver 81, the rotation along the upper tin rocket 61, and the descending stage. and undergoes prescribed annealing. The forged product A falls from the receiver 81 due to its own weight in the preparation chamber 33 located below the lower tin rocket 62 during the turning stage along the lower sprocket 62 of the receiver 81, so it is removed from the outlet. 54 to packet 92. The following is a repetition of the above. A shielding member 6 that divides the working chamber 31 into an upper processing chamber 32 and a lower preparation chamber 33 around the shaft of the lower sprocket 62.
3 is wound in a ring shape, and the shielding member 63 prevents draft from the outlet 54 to the inlet 52, so the temperature distribution in the processing chamber 32 is good. Therefore, while heating the processing chamber 32 at the start of operation, It is possible to close the opening/closing doors 51 and 53 and leave the opening/closing door 53 open during normal operation, but when opening the opening/closing door 51 during normal operation, the opening/closing door 53 must be closed. Conversely, when opening/closing door 53, opening/closing door 51 may be closed.

FIG. 2 is a side view of essential parts schematically showing another embodiment of the present invention, partially in section. Other structures, such as the heating sources 44, 45, the upper sprocket 64, the conveying member 72, and the plurality of receivers 82, which will not be described, are the same as in FIG. 1, but in this embodiment, the frame 12 In this embodiment, the top of the heat insulating material 22 supported by the insulator 22 has a semicircular cross-section, so that the shoulder of the processing chamber 34 is curved downward, and the processing chamber 34 has no internal fan. , it is possible to eliminate wasted space in the processing chamber 34 and to improve the temperature distribution, so it is particularly suitable for a relatively small self-heating annealing furnace.

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 effect that the installation space can be reduced, and it is particularly suitable for a relatively small self-heating annealing furnace.

[Brief explanation of drawings]

FIG. 1 is a side view schematically showing an embodiment of the present invention, partially in section, and FIG. 2 is a side view schematically showing a principal part of another embodiment of the present invention, partially in section. 11.12...Frame body, 21.22...Insulating material 31...Working chamber, 32.34...Processing chamber 33.
... Preparation room 41.42, 44.45 ... Heat source, 43 ...
Fan 51.53...Opening/closing door, 52...Entrance 5
4... Outlet 81.82.84... Sprocket 63... Shielding member 71.72... Transfer member, 81.82... Receiver A... Forged product

Claims (1)

[Claims] 1. A self-heating annealing furnace for annealing a forged product by slowly cooling it using its residual heat, which is surrounded by a heat insulating material having an inlet and an outlet, and is equipped with a heating source inside. The working chamber is formed in a vertical shape, and the working chamber is equipped with an upper sprocket and a lower sprocket facing the inlet, and around the shaft of the lower sprocket, the working chamber is installed in the upper sprocket. A shielding member is wrapped around the upper sprocket and the lower sprocket to separate a processing chamber and a lower preparation chamber, and between the upper sprocket and the lower sprocket are a plurality of receivers for storing the forged product. A forged product configured to be engaged with an attached endless conveying member and to intermittently drive one of the sprockets to intermittently move the receiver as a whole in an elliptical shape via the conveying member. self-heating annealing furnace. 2. The autothermal annealing furnace for forged products according to claim 1, wherein the upper sprocket is a driving sprocket and the lower sprocket is a floating sprocket supported by the driving sprocket via a conveying member. 3. The autothermal annealing furnace for forged products according to claim 1 or 2, wherein the processing chamber is equipped with a fan. 4. The self-thermal annealing furnace for forged products according to claim 1, 2 or 3, wherein the processing chamber has a shoulder portion which is inclined or curved downward.