JP2001335839A - Billet heater for warm forging - Google Patents

Abstract

(57) [Summary] A billet heater for dipping a preheated billet into a forging lubricant and then heating the billet for warm forging can be dipped by a simple device. A plurality of revolvers each having a plurality of revolving arms supported in a comb-shape on a rotating shaft, and a billet holder formed of a circular ring attached to the end thereof.
Are provided above the liquid level of the forging lubricant 17, and the billet 1 sent to the transport position by the roller conveyor 4.
0 is alternately scooped up by a billet holder 22 formed of a circular ring, turned to a dipping position, dipped in a forged lubricant 17, then inverted, and again waits for the next billet 10 at a transport position. The movable part is the swivel arm 21
The billet holder 22
Around the forged lubricant 17 with respect to the billet 10 held at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a billet heater for warm forging which preheats a billet, coats the surface with a forging lubricant, and then heats the billet for warm forging, and in particular, forging by dipping. The present invention relates to a dipping device that coats a billet surface with a lubricant.

[0002]

2. Description of the Related Art The above-mentioned dipping apparatus is a forging lubricant (hereinafter, referred to as an "aluminum") comprising an aqueous or oily solution containing graphite or the like.
It is simply called a lubricant. ) Is coated with a lubricant film on the billet surface by dipping a preheated billet. The lubricating material film acts to prevent surface oxidation during billet heating, prevent surface roughening during precision forging, and prevent seizure with a mold. Conventionally, as such a dipping device, a chucking type using an arm type robot, a conveyor type in which the material is dropped by a chute and pulled up by a conveyor, and a spraying type in which a lubricant is directly sprayed on a billet as another coating device are known. Have been. Hereinafter, these will be briefly described.

First, FIG. 10 shows a billet heater for warm forging provided with a chucking type dipping device (hereinafter, referred to as a billet heater).
It is simply called billet heater. 1 is a perspective view showing the overall configuration of FIG. In FIG. 10, a billet 50 generally cut from a bar is supplied from a material supply device 51 and sent to a preheater 54 by a chain conveyor 52 and a slat conveyor 53 to be preheated. Preheated billet 50
Is dipped in a lubricating material by a dipping device 55, and the surface is coated with a lubricating material film.
6 and heated by a slat conveyer 57 to a heating coil 58, through a chute 59 and forged by a forging machine (not shown). The dipping device 55 includes a dipping tank 60 containing a lubricant, an arm type robot 61, an immersion mechanism 62, and the like. The arm type robot 61 holds the preheated billet 50 with a chuck 63 of one hand.
When it is grasped individually, it turns 90 degrees and the billet 50
Hand to 2. When the immersion mechanism 62 grips the billet 64 with the chuck, the immersion mechanism 62 descends vertically, immerses it in the lubricant 65, and then rises again to the state shown in the figure. Meanwhile, the arm type robot 61 also returns to the illustrated state. Then, the coated billet 50 that has risen is received by the chuck 66 of the other hand, turned 90 degrees and released on the chain conveyor 56. At the same time, the next billet 50 is delivered from the chuck 63 to the immersion mechanism 62. By repeating this, the billet 50 is processed one after another.

FIG. 11 is a side view showing a conveyor type dipping apparatus. In FIG. 11, billet 70 conveyed from a preheating coil not shown is a chute 7
1, falls on a conveyor 73 in a dipping tank 72, is immersed in a lubricant 74, is scraped up by a claw 75, and is conveyed to a heating coil (not shown).

On the other hand, FIG. 12 is a partial sectional view showing a spray type coating apparatus, which is described in Japanese Patent Publication No. 6-79751. In FIG. 12, the billet 81 preheated by the preheating coil 80 passes through the lubricant adhering device 82,
4 and simultaneously heated by the heating coil 85 and conveyed to a forging machine (not shown) via an exhaust ring 86. In the exhaust ring 86, the off-flavor and steam accompanying the baking of the lubricant 84 are discharged from the upper opening, and the excess lubricant 84 is recovered from the lower opening.

[0006]

However, the above-mentioned conventional coating apparatus has the following problems. First, the chucking type (FIG. 10) has many movable parts such as the robot 61 and the immersion mechanism 62, and the control is complicated, and the chucking part of the billet 50 is hard to be coated. Next, in the conveyor system (FIG. 11), it is difficult to control the attitude of the billet 70 on the chute 71 or the conveyor 73, and the billet 70 is pushed from the conveyor 73 to the heating coil is unstable. Further, the conveyor 73 is provided with the dipping tank 7.
2, since it is immersed in the lubricant 74, it has a short life and is difficult to maintain. Furthermore, dipping time is long,
The attached lubricant 74 does not dry sufficiently. On the other hand, the spraying type (FIG. 12) has a nozzle 83 in the heating coil 85, so that the coil diameter becomes large and the coil structure becomes complicated. Further, the lubricant vapor easily enters the heating coil 85, and the coil life is shortened. Further, it is difficult for the lubricant to adhere to the end face and the lower face of the billet 81 and the contact face with the transport rail.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a billet heater which coats a lubricant by dipping, to realize stable billet conveyance and good coating by a dipping device having a simple structure, and to facilitate maintenance.

[0007]

In order to solve the above-mentioned problems, the present invention provides a preheater for preheating a billet, and immersing the preheated billet in a lubricating material in a dipping tank and applying the preheated billet to the surface thereof. A dipping device for coating a lubricant, and a billet heater for warm forging including a heater for heating the billet coated with the lubricant, wherein the dipping device includes:
A revolver comprising a horizontal rotating shaft that is driven to rotate in both directions and a turning arm that is supported by the rotating shaft and has a billet holder at the tip end that is formed of an annular body whose axis is parallel to the rotating shaft. Provided above the liquid level, this revolver makes the turning arm stand by at a transfer position on one side of the rotating shaft, and receives and holds the billets conveyed in a tandem state from the preheater one by one in the billet holder. Then, the turning arm is turned to the immersion position on the opposite side of the rotation axis to immerse the billet in the lubricant, and then the turning arm is turned back to the transfer position, and the billet is transferred to the heater. After being carried out, it is assumed that the billet waits for reception of the next billet (claim 1). The dipping apparatus according to the first aspect has a simple structure and simple control because only the movable part is the swivel arm, and the tip of the swivel arm is immersed in the lubricating material only during dipping of the billet. is there.

Preferably, the revolver has a plurality of the revolving arms in a comb shape, and holds the billet by bridging the billet between the plurality of billet holders. Due to this, the width (axial length) of the billet holder
In addition to minimizing the size, the billet is supported at multiple points in the axial direction by the billet holder, and a gap is provided between the support points, so that the lubrication material around the billet is immersed.

In the billet heater, a roller conveyer for conveying the billet across the dipping tank is provided between the preheating heater and the heating heater, and the roller conveyer has a plurality of conveying rollers driven to rotate. Preferably, the revolver causes the billet holder to enter the arrangement pitch of the transport rollers at the transport position, and waits with the ring inner peripheral surface positioned below the transport surface of the transport rollers. (Claim 3). By installing such a roller conveyor, the billet is smoothly transported to the revolver and the billet is transferred between the conveyor and the billet holder.

Preferably, the billet heater has two revolvers facing each other in the dipping device (claim 4). As a result, the processing speed can be doubled as compared with the case where a single revolver is used.

The revolver is connected to the dipping device by two.
In the billet heater having a base, while the turning arm of the one revolver is at the transfer position, the turning arm of the other revolver is temporarily stopped at a standby position between the transfer position and the immersion position, When the pivot arm of the one revolver receives and holds the billet and pivots to the immersion position, the pivot arm pivots to the transport position and waits for the next billet, during which the pivot arm of one revolver is coated after coating. While holding the billet and temporarily stopping at the standby position, after that, when the turning arm of the other revolver receives and holds the next billet and turns to the immersion position,
After returning to the transport position and unloading the billet, it also waits for the reception of the next billet,
In the meantime, it is preferable that the other pivot arm of the revolver holds the coated billet and temporarily stops at the standby position (claim 5). In this way, the billet entering the dipping device can be immediately scooped up by holding the swivel arm at the transfer position on the conveyor, and dipping is performed at the standby position between the transfer position and the dipping position of the swivel arm. By temporarily stopping the rear swing arm, it is possible to easily control the timing of the two revolvers facing each other.

It is preferable that the preheater, the dipping device and the heater are arranged so that the billet transport axis is in a straight line. This simplifies the transfer of billets between the dipping device, the preheating heater and the heating heater, and facilitates the timing control of the dipping device.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, FIG. 1 and FIG. 2 show the outer shape of the billet heater. FIG. 1 is a plan view, and FIG. 2 is a side view. 1 and 2, a chain conveyor 1, a slat conveyor 2, a preheater 3, a roller conveyor 4, a slat conveyor 5, a heater 6 and a chain conveyor 7 are arranged so that their transport axes are aligned. A dipping device 8 is installed in the middle of the process. In the material supply device 9 installed at the start end (the left end in FIG. 1) of the chain conveyor 1, a large number of cylindrical billets 10 (the outer shape is shown in FIG. 3) cut from a steel bar to a predetermined length are stored. The billet 10 has an axial direction of the chain conveyor 1 by a material alignment mechanism (not shown).
And fall down on the chain conveyor 1 by rolling one by one from its side. As shown in FIG. 2, the billets 10 received by the chain conveyor 1 are lined up in a row (one line in the axial direction) on the chain conveyor 1, and are conveyed from left to right in FIG.

When the billet 10 conveyed by the chain conveyor 1 reaches the slat conveyor 2, it is sandwiched from above and below and sent into the preheater 3 as described later. In the preheater 3, as shown in FIG. 2, the billet 10 is pushed from behind on the gutter-shaped rail 11 and slides, and during this time, is preheated to 150 to 200 ° C. by the preheat coil 12. When the billet 10 that has exited the preheater 3 reaches the roller conveyor 4, the first one is fast-forwarded and conveyed to the dipping device 8. In the dipping device 8, a revolver, which will be described in detail later, is on standby. The billet 10 conveyed is scooped up, immersed in a lubricant in a dipping tank, and returned to the roller conveyor 4 again. The billet 10 is further conveyed to the right by the roller conveyor 4, and when it reaches the slat conveyor 5, it is sandwiched from above and below and is fed into the heater 6. In the heater 6,
The billet 10 slides on the rail 14 (FIG. 2), during which it is heated by the heating coil 15 to 750-950 ° C. The billet 10 that has exited the heater 6 is passed on to the chain conveyor 7 and supplied from the end to a forging machine via a chute (not shown).

FIG. 4 shows the dipping device 8 with the cover removed.
FIG. 5 is a sectional view taken along the line VV. In FIGS. 4 and 5, reference numeral 16 denotes a rectangular box-shaped dipping tank whose front and rear (up and down in FIG. 4) central portions are configured to be shallow.
The inside is filled with a graphite-based water-soluble lubricant 17 (FIG. 5). The roller conveyor 4 is installed above the dipping tank 16 along the center axis in the front-rear direction.
Is transported on the roller conveyor 4 from left to right in FIG.
Above the liquid level of the lubricant 17, two revolvers 18 and 19 as a billet immersion mechanism are provided.
6 are installed facing each other across the front and rear central axes.
Each of the revolvers 18 and 19 includes a horizontal rotating shaft 20 that is driven to rotate in both directions, and a C-shaped swing arm 21 fixedly supported on the rotating shaft 20. Is fixed to an annular body parallel to the rotation shaft 20, in this case a billet holder 22 formed of a circular ring.

In FIG. 4, a rotating shaft 20 is arranged in parallel with the roller conveyor 4 and is rotatably supported at both ends by bearings 23. The bearings 23 are supported on a rectangular frame-like base 24 surrounding the dipping tank 16. ing. A pinion 25 is attached to one end of the rotating shaft 20, and the pinion 25 meshes with a rack 26. Rack 26
Are slidably guided on the upper surface of the gantry 24 horizontally and in a direction orthogonal to the rotation shaft 20, and are slid by an air cylinder 27 provided on a side surface of the gantry 24. That is, the rotating shaft 20 is rotationally driven by the air cylinder 27 via the rack 26 and the pinion 25, and the turning arm 21 turns accordingly. At this time, the turning arm 21 is controlled so as to turn and stop between three positions, that is, a transfer position, an immersion position, and a standby position indicated by reference numerals in FIG. Here, the roller conveyor 4 is provided with a conveying roller 28 formed of a cylindrical body having a narrowed central portion.
Are arranged at equal pitches, and each transport roller 2
8 rotates in synchronism with a chain 29 commonly hung on a sprocket provided at each end.

FIG. 6 is a plan view showing the roller conveyor 4 and the slat conveyor 5 following the roller conveyor 4 in detail, FIG. 7 is a side view thereof, FIG. 8 is an enlarged sectional view taken along line VIII-VIII of FIG.
Is a cross-sectional view along the line IX-IX. In FIG.
The drive motor 30 is decelerated by a speed reducer 31, and all of the transport rollers are passed through a chain 34 which is hung between a sprocket 32 at one end of the output shaft and a sprocket 33 attached to the shaft end of the transport roller 28 at the end. 28 is driven. As shown in FIG. 8, the billet 10 is
And is conveyed to the right in FIG. 6 with its rotation.

On the other hand, in FIGS. 7 and 9, the slat conveyor 5 is composed of a pair of upper and lower endless conveyor belts, each endless conveyor belt having three sprocket shafts 35, both ends of which are supported by bearings.
And a sprocket 3 attached to the center of each
6 (FIG. 6), and a number of slats 38 are attached to the outside of the chain 37 in a caterpillar shape. As shown in FIG. 9, an arc-shaped concave portion is formed at the center of the outer surface of the slat 38. The slat conveyor 5 sandwiches the billet 10 between the upper and lower concave portions, and rotates the chain 37 to move the billet 10 rightward in FIG. Transport to In FIG. 6, the slat conveyor 5 is provided with a gear 3 mounted on an extension shaft of a sprocket shaft 35 at the right end.
9 is driven by meshing with a gear 41 at the output shaft end of another speed reducer 40, and the speed reducer 40 is connected to the motor 30 by meshing a gear 42 at the input shaft end with a gear 43 at the other end of the output shaft of the speed reducer 31. Have been. In FIG. 6, the lower endless belt is shown, and the upper endless belt is provided with a gear 45 connected to a sprocket shaft 35 via a universal joint 44 as shown in FIG. The lower sprocket shaft 35 is driven by meshing with the gear 46 at the end of the extended shaft thereof.

The configuration of the slat conveyor 2 and its driving device are the same as those of the slat conveyor 5, and a detailed description thereof will be omitted. However, the driving device of the slat conveyor 2
In FIG. 6, an output shaft that drives the roller conveyor 4 drives the chain conveyor 1 via a chain. The chain conveyor 7 is driven independently. Although the detailed configuration of the chain conveyors 1 and 2 is also omitted, the billet 10 is mounted on a roller chain wound around the front and rear sprockets and transported, and the side surfaces of the billet 10 are provided on both sides of the roller chain. A guide rail consisting of a supporting inclined surface is provided.

The description of the structure of the billet heater has been completed above. Before describing the operation, schematic specifications of an actual production example are as follows. That is, this billet heater is intended for a carbon steel round billet having an outer diameter of 21 to 36 mm and a length of 150 to 400 mm, a pitch of the turning arms 21 (seven): 63 mm, a turning radius of 200 mm, and an inner diameter of the billet holder 22. / Outer diameter: 50/80 mm, width: 6 mm, conveying speed of slat conveyors 2, 5: 10 to 50 mm / sec, length of roller conveyor 4: about 1200 mm, conveying speed: 50 to 25
0 mm / sec, pitch of the conveying roller 28: 63 mm (same as the pitch of the turning arm 21), width of the dipping tank 16 /
Length: 950/650 mm, capacity: 120 liters. Now, the operation of the billet heater will be described.

1 and 2, the entire billet heater is controlled by a controller 47 (FIG. 2), and the chain conveyors 1, 7, the slat conveyors 2, 5 and the roller conveyor 4 are constantly moving from left to right in the drawing. moving. here,
The transport speeds of the slat conveyors 2 and 5 are synchronized with each other, but the transport speeds of the chain conveyors 1 and 7 and the roller conveyor 4 are set higher than that, for example, about five times. These transport speeds are appropriately adjusted in accordance with the dimensions of the billet 10 within the range of the transport speeds already described. Now, when the billet 10 is put on the chain conveyor 1 by the material supply device 9, the billet 10
Is conveyed to the right and eventually reaches the slat conveyor 2 and is fed into the preheater 6 by being sandwiched between upper and lower slats 38 (FIG. 9). The billet 10 is heated by the preheating coil 12 while traveling in the preheater 3 and is preheated to 150 to 200 ° C. The preheated billet 10 goes further to the right,
When the leading end portion gets on the roller conveyor 4 to some extent, the top one is fast-forwarded by the roller conveyor 4 having a high speed as described above, and moves rapidly toward the dipping device 8 away from the subsequent one. I do.

At the entrance of the roller conveyor 4, a photoelectric sensor 13 for detecting the entry of the billet 10 (FIG. 1)
The time required for the billet 10 detected by the sensor 13 to reach the dipping device 8 is automatically calculated from the distance from the sensor 13 to the dipping device 8 and the transport speed of the roller conveyor 4. on the other hand,
In FIG. 5, in the dipping device 8, of the two front and rear revolvers 18, 19, the turning arm 21 of the front revolver 18 is at the transfer position, and the turning arm 21 of the revolver 19 is at the standby position. Therefore, the billet 10 sent to the dipping device 8 has the revolver 18 which stands by so that the inner peripheral surface is positioned lower than the conveying surface of the conveying roller 28 between the arrangement pitches of the conveying rollers 28 as described above. It enters the billet holder 22. Therefore, based on the above calculation time, the turning arm 21 turns clockwise in FIG. 5 at the timing when the axial centers of the billet 10 and the revolver 18 coincide with each other, and moves the billet 10 to the billet holder 22.
And scoop it up. In FIG. 4, the billet 10 is the longest 40
This shows the case where the object of 0 mm is held, and the billet 1
0 is bridged over all (seven) billet holders 22. The shortest 150 mm billet 10 is held across three billet holders 22.

In FIG. 4, the swivel arm 21 which has picked up the billet 10 is swiveled to the immersion position, and
Is immersed in the lubricant 17. Next, the turning arm 21
Reverses, turns to the standby position and pauses. On the other hand, the turning arm 21 of the revolver 19 stops at the standby position while the turning arm 21 of the revolver 18 is at the transfer position, but turns clockwise when the turning arm 21 of the revolver 18 reaches the immersion position. And waits for the next billet 10 at the transport position. When the next billet 10 is detected by the sensor 13, the billet 10 is turned counterclockwise to the immersion position at the above-described predetermined timing, the immersed billet 10 is immersed in the lubricant 17, then inverted and temporarily stopped at the standby position. I do.

In the meantime, the turning arm 21 of the revolver 18
Starts turning counterclockwise when the turning arm 21 of the revolver 19 reaches the immersion position, and stops at the transfer position. Then, the coated billet 10 held in contact with the transport roller 28 contacts the billet holder 22.
The empty swing arm 21 waits for the next billet 10 as it is. By repeating such an operation, the dipping apparatus 8 alternately turns the two revolvers 18 and 19 to continuously coat the billet 10. The coated billet 10 is conveyed to the heater 6 by the roller conveyor 4 and the slat conveyor 5 in FIG. 1 and FIG.
Heat to 750-950 ° C. The billet 10 that has exited the heater 6 is transported by a chain conveyor 7 to a chute (not shown), and is supplied to a forging machine (not shown) via the chute.

In the above-described embodiment, the dipping device 8 has a simple structure in which the swivel arm 21 only swivels, and the control is simple, in which the swivel arm 21 is swiveled and stopped in accordance with the entry of the billet 10. In addition, since the movable portion is not immersed in the lubricant 17, the operation is reliable, the failure is small, and the maintenance is easy. Further, by appropriately increasing the inner diameter of the billet holder 22 with respect to the outer diameter of the billet 10, a clearance is provided around the billet 10 so that the lubricating material 17 around the immersion can be improved. it can. In that case, the number of the turning arms 21 is one,
Although it is possible to increase the width of the billet holder 22, as shown in the drawing, the width of the billet holder 22 is reduced to a plurality of billets, and even the short billet 10 is securely held by being bridged over at least two billet holders 22. And the surroundings of the lubricant 17 can be further improved. When the number of the turning arms 21 is small and the width of the billet holder 22 is large, the billet holder 22
It is good to make a gap by making the shape of a coil spring, for example.

The conveyor installed across the dipping tank between the preheating coil 3 and the heater 6 is not limited to the roller conveyor 4, but by using the roller conveyor 4 as shown in FIG. In between, the inner peripheral surface of the billet holder 22 is positioned slightly below the transport surface of the transport roller 28, so that the billet 10 can be reliably scooped up. In this case, the roller conveyor 4 is driven and controlled separately from the slat conveyor 2 at the preceding stage, so that the conveying speed is higher than that of the slat conveyor 2 at the preceding stage, and the roller conveyor 4 is fast-forwarded to the leading billet 10 to enter. And the coating processing time in the dipping device 8 can be appropriately secured.

Although only one of the revolvers 18 and 19 may be used, it is not necessary to stop the revolver 18 at the standby position. In this case, two revolvers 18 and 19 are provided to face each other so that While the billet 10 is immersed in the second billet 1 with the other revolver 19,
By scooping up 0, the waiting time can be effectively used, and the processing speed can be doubled.

The preheater 3, dipping device 8 and heater 6 are preferably arranged so that the billet transport axis is in a straight line as shown. As a result, the efficiency of the installation space is improved, and the orientation of the billet 10 can be maintained in the same direction during transportation.
Delivery of billets between the preheating heater 3 and the heating heater 6 is simplified, and the timing control of billet feeding to the dipping device 8 that holds and turns and reverses the billet 10 is facilitated. In the above-described embodiment, the billet shape is cylindrical, but the billet heater of the present invention can also handle polygonal billets such as quadrangular and hexagonal. On the other hand, the billet holder 22 does not necessarily have to be circular, and an appropriate shape such as a polygon can be adopted as long as it is an annular body. Further, the annular body does not necessarily need to be completely closed, and may be a C-shape in which a part is cut out as long as the held billet does not fall off.

[0029]

As described above, according to the present invention, the structure of the dipping device is simple and easy to control, and there is little fear of failure due to the lubricant. In addition, since the lubrication material around the billet is ensured, the quality of the coating process is improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a billet heater according to an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a perspective view illustrating a shape of a billet.

FIG. 4 is an enlarged plan view of the dipping device in FIG.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is an enlarged plan view showing a roller conveyor and a slat conveyor in FIG. 1;

FIG. 7 is a side view of FIG. 6;

8 is an enlarged sectional view taken along line VIII-VIII in FIG.

FIG. 9 is an enlarged sectional view taken along line IX-IX of FIG. 7;

FIG. 10 is a perspective view of a billet heater showing a conventional example.

FIG. 11 is a longitudinal sectional view of a dipping apparatus showing a different conventional example.

FIG. 12 is a partial sectional view of a billet heater showing still another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chain conveyor 2 Slat conveyor 3 Preheater 4 Roller conveyor 5 Slat conveyor 6 Heater 7 Chain conveyor 8 Dipping device 9 Material supply device 10 Billet 11 Rail 12 Preheating coil 13 Sensor 14 Rail 15 Heating coil 16 Dipping tank 17 Forging lubricant 18 Revolver 19 Revolver 20 Rotating shaft 21 Swivel arm 22 Billet holder 23 Bearing 24 Mount 25 Pinion 26 Rack 27 Air cylinder 28 Transport roller 47 Control device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) F27B 9/20 F27B 9/20

Claims (6)

[Claims] 1. A preheating heater for preheating a billet, a dipping apparatus for immersing the preheated billet in a forging lubricant in a dipping tank and coating the surface of the billet with the forging lubricant; In a billet heater for warm forging comprising a heater for heating the coated billet, the dipping device is a biaxially-rotated and driven horizontal rotating shaft, and is supported by the rotating shaft, and has a shaft center at the tip. A revolver comprising a revolver having a billet holder formed of an annular body parallel to the rotating shaft is provided above the level of the forged lubricant, and the revolver moves the revolver to a transfer position on one side of the rotating shaft. While waiting, the billets conveyed in tandem from the preheater are received and held one by one in the billet holder, and then The swivel arm is swiveled to an immersion position on the opposite side of the rotation axis to immerse the billet in the forged lubricant, and then the swivel arm is turned back to the transfer position, and the billet is transferred to the heater. A billet heater for warm forging, characterized in that after being carried out, the billet heater for warm forging stands by in preparation for receiving the next billet. 2. The forging for warm forging according to claim 1, wherein the revolver has a plurality of the revolving arms in a comb shape, and holds the billet by bridging between the plurality of billet holders. Billet heater. 3. A roller conveyor for transporting the billet across the dipping tank is provided between the preheater and the heater, the roller conveyor having a plurality of rotationally driven transport rollers, 2. The revolver according to claim 1, wherein the billet holder is caused to enter between the arrangement pitches of the transport rollers at the transport position, and a ring inner peripheral surface is positioned below the transport surface of the transport rollers to wait. The billet heater for warm forging according to claim 2. 4. The billet heater for warm forging according to claim 1, wherein the revolver has two opposing revolvers. 5. While one of the revolver's pivot arms is at the transfer position, the other revolver's pivot arm temporarily stops at a standby position between the transfer position and the immersion position. When the pivot arm of the revolver receives and holds the billet and pivots to the immersion position, it pivots from the standby position to the transport position and waits for the next billet, during which the pivot arm of one of the revolvers is While holding the billet after coating and temporarily stopping at the standby position, and then turning the other revolver arm to receive and hold the next billet and rotate to the immersion position, the transfer from the standby position to the transfer After returning to the position and unloading the billet, it waits for reception of the next billet, during which the other Pivoting arm of the serial revolver is warm forging billet heater according to claim 4, characterized in that the pause at the waiting position while holding the billet after coating. 6. The billet heater for warm forging according to claim 1, wherein the preheater, the dipping device, and the heater are arranged so that a billet conveying axis is aligned.