JPH03202415A - Self heating annealing furnace for forged parts - Google Patents

Abstract

PURPOSE:To reduce the setting space of the self heating annealing furnace by successively placing forged parts in plural containers, intermittently introducing the containers into a vertical treating chamber and annealing the parts by self heating with the remaining heat while traveling the containers in the chamber. CONSTITUTION:The upper sprocket 51 in the vertical treating chamber 31 is intermittently driven to intermittently travel plural receivers 71 through a conveyor member 61. When the sprockets 51 and 52 are stopped in the open region 32, the forged parts A are successively forced into the receivers 71 from a feeder 91. The part A is introduced along with the receiver 71 from an inlet 81 into the chamber 31 enclosed by an insulating material 21. The part and the receiver 71 are raised, turned and lowered in the chamber 31, and the part is slowly cooled while gradually giving off its remaining heat and annealed. The annealed part A is discharged to the open region 32 from an outlet 82 and dropped by gravity into a basket 92 when the receiver 71 is turned. As a result, the self heating annealing furnace is miniaturized, and operation is smoothly and safely carried out.

Description

[Detailed description of the invention] <Industrial application field> 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 an incandescent annealing furnace used for annealing heated steel forgings, and particularly to an autothermal annealing furnace whose processing chamber is formed into a rigid shape.

<Prior Art> Conventionally, there are various types of incandescent 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 processing 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, all of the conventional self-heating annealing furnaces as described above have a processing chamber formed horizontally, and therefore have a problem in that the installation space is large.

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 processing chamber in which the heating source is installed is formed into a wall shape, and between an upper sprocket installed in the processing chamber and a lower sprocket installed in an open area below the outside of the processing chamber. An endless conveyor member to which a plurality of receivers for storing the forged products are attached is engaged, and by intermittently driving one of the sprockets, the receivers are lengthened as a whole via the conveyor member. An incandescent annealing furnace for forged products, the main feature of which is that the forged products are transported intermittently from the open area to the processing chamber by circular movement, and at the same time are sequentially transported from the processing chamber to the open area. related to.

In the present invention, the processing chamber is formed into a wall shape, and the lower outside of the processing chamber is an open area.

the processing chamber is equipped with an upper sprocket, and the open area is equipped with a lower sprocket;
An endless conveying member is engaged between the upper and lower sprockets, and a plurality of receivers for storing forged products are attached to the conveying member. The conveying member and the receiver therefore span the processing chamber and the open area via inlets and outlets provided in the heat insulating material surrounding the processing 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 as follows: charging from the open area to the processing chamber → rising in the processing chamber → turning along the upper sprocket in the processing chamber → descending in the processing chamber → charging from the processing chamber to the open area → Descending in the open area → Turning along the lower sprocket in the open area → Ascending in the open area 4 Charging from the original state of the open area to the processing chamber, repeating the above process. Intermittent movement. Therefore, if the forgings are sequentially stored in the corresponding receivers during the rising stage in the open area while the sprocket is stopped, the forgings will be stored in the rising and turning stages of the receivers in the processing chamber and during the lowering stage. It is slowly cooled while gradually reducing its residual heat and undergoes a prescribed annealing process. The forging is then removed, for example mechanically or by gravity, during the lowering or pivoting phase of the receiver in the open area.

According to the present invention, since the processing chamber is formed into a wall shape,
Installation space can be reduced. In addition, if the processing chamber has a relatively small capacity, a stirring effect can be obtained by the intermittent lifting, rotation, and lowering of multiple receivers containing forged products, so it is necessary to install a fan inside the processing chamber. This can be omitted, and wasteful space in the processing chamber can be eliminated accordingly. 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 an idler sprocket supported by the driving sprocket via a conveying member, the thermal expansion of these can be absorbed, making the process smoother. Moreover, safe driving can be achieved.

<Embodiment> FIG. 1 is a side view schematically showing an embodiment of the present invention, partially in section. A processing chamber 31 is surrounded by a heat insulating material 21 supported by a frame 11 and is formed in a molded manner, and a heating source 41, 42 and a fan 43 are installed inside the processing chamber 31. The outside lower part of the processing chamber 31 is an open area 32, and the processing chamber 3
1 is equipped with an upper sprocket 51, and the open area 32 is equipped with a lower sprocket 52. In the drawing, the upper sprocket 51 is the driving sprocket, and the lower sprocket 52 is the idler sprocket. It has become a sprocket. An endless conveying member 61 is engaged between the upper and lower sprockets 51 and 52 supported on the frame 11, and the conveying member 61 has a plurality of receivers 71 with only one side end open. They are installed at predetermined intervals. The conveying member 61 and the plurality of receivers 71 straddle the processing chamber 31 and the open area 32 via an inlet 81 and an outlet 82 provided at the bottom of the heat insulating material 21 surrounding the processing chamber 31 .

When the upper subblock 51 is driven intermittently, the plurality of receivers 71 are intermittently moved via the conveying member 61. Such intermittent movement of the plurality of receivers 71 is as described above. During the rising phase of the receiver 71 in the open area 32, while the sprockets 51, 52 are at rest, the receiver 7
1 is stopped, the forgings A that are about to be placed on the charging table 91 are pushed into the receiver 71 and stored, and the forgings A are sequentially loaded together with the receiver 71 from the inlet 81 into the processing chamber 31. During the ascending, rotating and descending stages of the receiver 71 in the processing chamber 31, the receiver 71 is slowly cooled while gradually reducing its residual heat, and undergoes a predetermined annealing. The forged product A is then delivered together with the receiver 71 from the outlet 82 to the open area 32, and falls into the packet 92 due to its own weight when the receiver 71 rotates in the open area 32.

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 53, the conveying member 62, and the plurality of receivers 72, which will not be described, are the same as those shown in FIG. 1, but in this embodiment, the frame 12 In this embodiment, the top of the heat insulating material 22 supported by the insulating material 22 has a semicircular cross section, and therefore the shoulder of the processing chamber 33 is curved downward, and the processing chamber 33 is not equipped with a fan. , it is possible to eliminate wasted space in the processing chamber 33, and also 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 a plurality of receivers can be screwed together with bolts and nuts through reinforcing members if necessary to the links of the chain, and a conveyor can be used instead of the packet 92. 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 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.

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 processing chamber is formed into a rigid shape, and the forged product is stored between an upper sprocket installed in the processing chamber and a lower sprocket installed in an open area below the outside of the processing chamber. an endless conveying member having a plurality of receptacles attached thereto;
By intermittently driving one of the sprockets, the entire receiver is intermittently moved in an elliptical shape via the conveying member, and is sequentially transported from the open area to the processing chamber, and at the same time, the receiver is transported from the processing chamber to the processing chamber. A self-heating annealing furnace for forgings configured to be sequentially transported to an open area. 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.