JP4857457B2 - Billet heater for warm forging - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a billet heater for warm forging that preheats a billet and then coats the surface with a forged lubricant and then further heats it for warm forging. In particular, the billet surface is coated with the forged lubricant by dipping. The present invention relates to a dipping device.
[0002]
[Prior art]
The dipping device coats a billet surface with a lubricant film by immersing a pre-heated billet in a forged lubricant (hereinafter simply referred to as a lubricant) made of an aqueous or oily solution containing graphite. is there. This lubricant film acts to prevent surface oxidation during heating of the billet and to prevent rough surface and seizure with the mold during precision forging. Conventionally known as such a dipping device is a chucking type by an arm type robot, a conveyor type that drops by a chute and pulls it up by a conveyor, and a spraying type in which a lubricant is directly sprayed on a billet is known as another coating device. It has been. These will be briefly described below.
[0003]
First, FIG. 10 is a perspective view showing an entire configuration of a warm forging billet heater (hereinafter simply referred to as a billet heater) provided with a chucking dipping device. In FIG. 10, billets 50 generally cut from steel bars are supplied from a material supply device 51, sent to a preheating heater 54 by a chain conveyor 52 and a slat conveyor 53, and preheated. The preheated billet 50 is dipped in a lubricant by a dipping device 55 and coated with a lubricant film, and then sent to a heating coil 58 by a chain conveyor 56 and a slat conveyor 57 to be heated. Warm forging with a forging machine that does not. The dipping device 55 includes a dipping tank 60 containing a lubricant, an arm type robot 61, a dipping mechanism 62, and the like. The arm type robot 61 holds the pre-heated billet 50 one by one with the chuck 63 of one hand. The billet 50 is handed to the immersion mechanism 62. When the billet 64 is gripped by the chuck, the dipping mechanism 62 descends vertically and is dipped in the lubricant 65, and then rises again to the illustrated state. 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 handed from the chuck 63 to the dipping mechanism 62. By repeating this, the billet 50 is processed one after another.
[0004]
Next, FIG. 11 is a side view showing a conveyor type dipping device. In FIG. 11, the billet 70 conveyed from the preheating coil (not shown) slides on the chute 71 and falls onto the conveyor 73 in the dipping tank 72, and is then scraped up by the claws 75 while being immersed in the lubricant 74, and then heated (not shown). It is conveyed to the coil.
[0005]
On the other hand, FIG. 12 is a partial cross-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 is sprayed with the lubricant 84 from the spray nozzle 83 and simultaneously heated by the heating coil 85 while passing through the lubricant adhering device 82. After passing through 86, it is conveyed to a forging machine (not shown). In the wind exhaust ring 86, a strange odor and vapor 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]
[Problems to be solved by the invention]
However, the above-described conventional coating apparatus has the following problems. First, the chucking type (FIG. 10) has many movable parts such as the robot 61 and the dipping mechanism 62 and is complicated to control, and the chucking part of the billet 50 is difficult to be coated. Next, in the conveyor system (FIG. 11), it is difficult to control the posture of the billet 70 on the chute 71 or the conveyor 73, and the pushing of the billet 70 from the conveyor 73 to the heating coil is unstable. Further, since the conveyor 73 is immersed in the lubricant 74 by the dipping tank 72, it has a short life and is difficult to maintain. Furthermore, the dipping time is long and the adhered lubricant 74 is not sufficiently dried. On the other hand, the spraying type (FIG. 12) has the 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 surface and the lower surface of the billet 81 and the contact surface with the transport rail.
SUMMARY OF THE INVENTION An object of the present invention is to realize stable billet conveyance and good coating with a dipping device having a simple structure and facilitate maintenance in a billet heater that coats a lubricant by dipping.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a preheating heater for preheating a billet, and a dipping device for immersing the preheated billet in a forged lubricant in a dipping tank and coating the forged lubricant on the surface thereof. And a warm forging billet heater comprising a heater for heating the billet coated with the forging lubricant,
The dipping device comprises a revolver comprising a horizontal rotating shaft that is driven to rotate in both directions, and a swivel arm that is supported by the rotating shaft and has a billet holder that is formed of an annular body whose axis is parallel to the rotating shaft. the preparation for the liquid level above the forging lubricant, the revolver is waiting for the pivot arm to one side conveying position of the rotary shaft, the said billet is conveyed in a tandem state from the pre-heaters one by one The billet is received and held in the billet holder, and then the swivel arm is swung to the dipping position on the side opposite to the rotating shaft to immerse the billet in the forged lubricant, and then the swivel arm is moved to the dipping position and the transfer position. said to the standby position of the liquid surface above the forging lubricant paused by inverting the intermediate, then, is reversed returning the swivel arm to the transfer position, the billet After out towards the serial heater, characterized by waiting on the acceptance of the next of said billet (claim 1). The dipping device according to claim 1 has a simple structure and simple control since the movable part is only the swing arm, and the swing arm is only broken when the tip of the swing arm is dipped, so that the maintenance is easy with little trouble. is there.
[0008]
The revolver preferably has a plurality of swivel arms in a comb shape and spans and holds the billet between the plurality of billet holders. As a result, the width (axial length) dimension of the billet holder is made as small as possible, and the billet is supported at multiple points in the axial direction by this billet holder, and gaps are provided between the supporting points to lubricate when the billet is immersed. The surroundings of the material can be improved.
[0009]
In the billet heater, a roller conveyor is disposed between the preheating heater and the heating heater to convey the billet across the dipping tank, and the roller conveyor has a plurality of conveyance rollers that are driven to rotate, The revolver preferably waits with the billet holder entering between the arrangement pitches of the conveyance rollers at the conveyance position and the lower surface of the inner periphery of the ring positioned below the conveyance surface of the conveyance rollers. Item 3). By installing such a roller conveyor, the conveyance of the billet to the revolver and the delivery of the billet between the conveyor and the billet holder are smoothly performed.
[0010]
The billet heater may have two revolvers facing the dipping device (claim 4). As a result, the processing speed can be improved by a factor of two compared to a single revolver.
[0011]
In the billet heater having two revolvers in the dipping device, while the revolving arm of one revolver is in the transport position, the revolving arm of the other revolver is between the transport position and the immersion position. While temporarily stopping at the standby position, when the swing arm of the one revolver receives and holds the billet and swings to the immersion position, it swings to the transport position and waits for the next billet, The revolver swivel arm holds the billet after coating and temporarily stops at the standby position.After that, when the other revolver swivel arm receives and holds the next billet and swivels to the immersion position, After returning to the transfer position and unloading the billet, receiving the next billet Waiting on the record, while the pivoting arm of the other of said revolver good that shall pause the waiting position while holding the billet after coating (claim 5). By making the swivel arm stand by at the transfer position on the conveyor in this way, the billet entering the dipping device can be picked up immediately, and dipping is performed at the stand-by position between the transfer position of the swivel arm and the dipping position. By temporarily stopping the subsequent swing arm, the timing control of the two revolvers facing each other can be facilitated.
[0012]
The preheating heater, the dipping device, and the heating heater are preferably arranged so that the billet conveyance axis is in a straight line. Thereby, delivery of the billet between the dipping device and the preheating heater and the heating heater is simplified, and timing control of the dipping device is facilitated.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 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, the chain conveyor 1, the slat conveyor 2, the preheater heater 3, the roller conveyor 4, the slat conveyor 5, the heater 6, and the chain conveyor 7 are arranged so that the transport axes are in a straight line. A dipping device 8 is installed in the middle. 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 (external shape is shown in FIG. 3) cut from a steel bar to a predetermined length are stored. The billets 10 are arranged in parallel with the chain conveyor 1 by a material alignment mechanism (not shown), and roll onto the chain conveyor 1 one by one from the side and fall. As shown in FIG. 2, the billets 10 received by the chain conveyor 1 are arranged in a column (one line in the axial direction) on the chain conveyor 1 and are conveyed from the left to the right in FIG.
[0014]
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 preheating heater 3 as will be described later. In the preheating heater 3, as shown in FIG. 2, the billet 10 is pushed while sliding on the bowl-shaped rail 11 from behind, while being preheated to 150 to 200 ° C. by the preheating coil 12. Billet 10 leaving the preheater 3 is one head of the approaches to the roller conveyor 4 is multiplied fast forward, are conveyed to the dipping device 8. In the dipping device 8, a revolver, which will be described in detail later, stands by, picks up the billet 10 that has been conveyed, immerses it in the lubricant in the dipping tank, and returns it 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 sent to the heater 6. In the heater 6, the billet 10 moves while sliding on the rail 14 (FIG. 2), and is heated to 750 to 950 ° C. by the heating coil 15 during that time. The billet 10 that has exited the heater 6 is inherited by the chain conveyor 7 and is supplied to the forging machine through a chute (not shown) from its end.
[0015]
4 is a plan view of the dipping device 8 with the cover removed, and FIG. 5 is a cross-sectional view taken along the line V-V. 4 and 5, reference numeral 16 denotes a rectangular box-shaped dipping tank, with the front and rear (upper and lower sides in FIG. 4) central portions being shallow and filled with a graphite-based water-soluble lubricant 17 (FIG. 5). ing. The roller conveyor 4 is installed above the dipping tank 16 along the front and rear central axes, and the billet 10 is conveyed on the roller conveyor 4 from the left to the right in FIG. Above the liquid surface of the lubricant 17, two revolvers 18 and 19 as billet dipping mechanisms are installed facing each other across the front and rear central axes of the dipping tank 16. Each of the revolvers 18 and 19 includes a horizontal rotary shaft 20 that is driven to rotate in both directions, and a C-shaped swing arm 21 fixedly supported by the rotary shaft 20. Is fixed to an annular body parallel to the rotating shaft 20, in this case, a billet holder 22 made of a circular ring.
[0016]
In FIG. 4, the rotary shaft 20 is disposed in parallel with the roller conveyor 4 and is rotatably supported by bearings 23 at both ends. The bearing 23 is supported on a rectangular frame-shaped pedestal 24 surrounding the dipping tank 16. A pinion 25 is attached to one end of the rotating shaft 20, and the pinion 25 meshes with a rack 26. The rack 26 is guided to be slidable horizontally on the upper surface of the gantry 24 and in a direction perpendicular to the rotary shaft 20, and is slid by an air cylinder 27 provided on the side surface of the gantry 24. That is, the rotary 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 that time, as will be described later, the swivel arm 21 swivels and stops between three positions of the transfer position (1), the dipping position (2), and the standby position (3) indicated by reference numerals ( 1) to (3) in FIG. To be controlled. Here, the roller conveyor 4 is configured by arranging a plurality of conveying rollers 28 formed of a cylindrical body having a constricted central portion at an equal pitch, and each conveying roller 28 is a chain that is commonly hung on a sprocket provided at one end. Rotate synchronously with 29. [0017]
FIG. 6 is a plan view showing the roller conveyor 4 and the slat conveyor 5 in detail, FIG. 7 is a side view thereof, FIG. 8 is an enlarged sectional view taken along line VIII-VIII of FIG. 7, and FIG. It is sectional drawing which follows a line. In FIG. 6, the drive motor 30 is decelerated by a speed reducer 31, via a chain 34 hung between a sprocket 32 at one end of its output shaft and a sprocket 33 attached to the shaft end of the end conveying roller 28. All the transport rollers 28 are driven. As shown in FIG. 8, the billet 10 is supported by the constricted portion of the transport roller 28, and is transported in the right direction of FIG.
[0018]
On the other hand, in FIGS. 7 and 9, the slat conveyor 5 is composed of a pair of upper and lower infinite transport belts, and each infinite transport belt has three sprocket shafts 35 supported at both ends by bearings and sprockets attached to the centers thereof. 36 (FIG. 6), and a large 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 recess is formed in the center of the outer surface of the slat 38, the slat conveyor 5 sandwiches the billet 10 between the upper and lower recesses, and the billet 10 is moved to the right in FIG. Transport to. In FIG. 6, the slat conveyor 5 is driven by the gear 39 attached on the extension shaft of the rightmost sprocket shaft 35 meshing with the gear 41 at the output shaft end of another speed reducer 40, and the speed reducer 40 is driven by the input shaft. The gear 42 at the end meshes with the gear 43 at the other end of the output shaft of the speed reducer 31 and is connected to the motor 30. FIG. 6 shows an infinite transport band on the lower side of the slat conveyor 5, and the upper infinite transport band has a gear 45 connected to the sprocket shaft 35 via a universal joint 44 as shown in FIG. 9. It is driven by meshing with the gear 46 at the end of the extension shaft of the lower sprocket shaft 35.
[0019]
Since the configurations of the slat conveyor 2 and its driving device are the same as those of the slat conveyor 5, detailed description thereof will be omitted. However, the drive device for the slat conveyor 2 drives the chain conveyor 1 via the chain on the output shaft that drives the roller conveyor 4 in FIG. The chain conveyor 7 is driven independently. Although detailed illustrations of the chain conveyors 1 and 2 are omitted, both carry the billet 10 on the roller chain wound around the front and rear sprockets, and the sides of the billet 10 are attached to both sides of the roller chain. A guide rail comprising an inclined surface to be supported is provided.
[0020]
This is the end of the description of the structure of the billet heater. Before starting the description of the operation, the outline specifications of an actual manufacturing example are as follows. That is, this billet heater is intended for carbon steel round billets having an outer diameter of 21 to 36 mm and a length of 150 to 400 mm. The pitch of the swing arms 21 (7): 63 mm, the same turning radius: 200 mm, and the inner diameter of the billet holder 22 / Outer diameter: 50/80 mm, same width: 6 mm, transport speed of slat conveyors 2, 5: 10-50 mm / sec, length of roller conveyor 4: about 1200 mm, same transport speed: 50-250 mm / sec, transport rollers 28 pitch: 63 mm (same as the pitch of the swivel arm 21), dipping tank 16 width / length: 950/650 mm, same capacity: 120 liters. Now, the operation of this billet heater will be described.
[0021]
1 and 2, the entire billet heater is controlled by a controller 47 (FIG. 2), and the chain conveyors 1 and 7, the slat conveyors 2 and 5, and the roller conveyor 4 are constantly moving from the left to the right in the figure. . Here, the conveying speeds of the slat conveyors 2 and 5 are synchronized with each other, but the conveying speeds of the chain conveyors 1 and 7 and the roller conveyor 4 are higher than that, for example, about 5 times. In addition, these conveyance speeds are appropriately adjusted according to the dimensions of the billet 10 within the range of the conveyance speeds already shown. 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. When the billet 10 eventually reaches the slat conveyor 2, it is sandwiched between the upper and lower slats 38 (FIG. 9). 6 is sent. The billet 10 is heated by the preheating coil 12 while proceeding through the preheating heater 3 and preheated to 150 to 200 ° C. The pre-heated billet 10 advances further to the right, and when the tip of the billet 10 gets on the roller conveyor 4 to some extent, as described above, the top one is fast-fed by the high-speed roller conveyor 4 and the subsequent ones Proceeds rapidly towards the dipping device 8 away.
[0022]
Here, a photoelectric sensor 13 (FIG. 1) for detecting the entry of the billet 10 is installed at the entrance of the roller conveyor 4. From the distance from the sensor 13 to the dipping device 8 and the conveying speed of the roller conveyor 4, the sensor The time for the billet 10 detected at 13 to reach the dipping device 8 is automatically calculated. On the other hand, in FIG. 5, in the dipping device 8, the swivel arm 21 of the front revolver 18 among the two front and rear revolvers 18, 19 is in the transfer position (1), and the swivel arm 21 of the revolver 19 is in the standby position ( 3). Therefore, the billet 10 sent to the dipping device 8 waits so that the lower surface of the inner periphery is positioned below the conveying surface of the conveying roller 28 between the arrangement pitches of the conveying rollers 28 as described above. Into the billet holder 22. Therefore, the turning arm 21 turns in the clockwise direction in FIG. 5 at the timing when the axial centers of the billet 10 and the revolver 18 coincide with each other based on the calculation time, and the billet 10 is scooped up by the billet holder 22. In FIG. 4, the billet 10 is shown in the case where the longest 400 mm is held, and the billet 10 is stretched over all (seven) billet holders 22. The shortest 150 mm billet 10 is held across three billet holders 22.
[0023]
In FIG. 5 , the swivel arm 21 of the revolver 18 that scoops up the billet 10 swivels to the dipping position (2), so that the billet 10 is dipped in the lubricant 17. Next, the revolving arm 21 is reversed, revolves to the standby position (3), and temporarily stops. On the other hand, the swivel arm 21 of the revolver 19 is stopped at the standby position (3) while the swivel arm 21 of the revolver 18 is at the transfer position (1), but the swivel arm 21 of the revolver 18 is stopped at the immersion position (2). At this point, turning is started in the clockwise direction, and the next billet 10 is waited at the transfer position (1). When the next billet 10 is detected by the sensor 13, the billet 10 turns counterclockwise to the immersion position (2) at the predetermined timing, soaks up the billet 10 into the lubricant 17, and then reverses to the standby position. Pause at (3).
[0024]
Meanwhile, the turning arm 21 of the revolver 18 starts to turn counterclockwise when the turning arm 21 of the revolver 19 reaches the immersion position (2) and stops at the transfer position (1). Then, the coated billet 10 that has been held is brought out of the billet holder 22 in contact with the conveying roller 28, so that the empty turning arm 21 is ready for the next billet 10 as it is. By repeating such operations, the dipping device 8 turns the two revolvers 18 and 19 alternately to coat the billet 10 continuously. 1 and 2, the coated billet 10 is conveyed to the heater 6 by the roller conveyor 4 and the slat conveyor 5 and heated to 750 to 950 ° C. The billet 10 that has exited the heater 6 is conveyed to a chute (not shown) by the chain conveyor 7 and is supplied to a forging machine (not shown) via the chute.
[0025]
In the above-described embodiment, the dipping device 8 has a simple structure in which the swivel arm 21 is swiveled, and the control is simple such that the swivel arm 21 is swung and stopped in accordance with the entry of the billet 10. In addition, since the movable part is not immersed in the lubricant 17, the operation is reliable, there are few failures, and maintenance is easy. Furthermore, by setting the inner diameter of the billet holder 22 to be appropriately larger than the outer diameter of the billet 10, a gap is provided around the billet 10 to improve the surroundings of the lubricant 17 during immersion. it can. In that case, it is possible to increase the width of the billet holder 22 as a single swivel arm 21, but as shown in the drawing, the width of the billet holder 22 is reduced so that at least two billet holders can be used even with the short billet 10. It can hold | maintain reliably by hanging over 22, Furthermore, the circumference | surroundings of the lubricant 17 can be made more favorable. In addition, when the number of the turning arms 21 is small and the width of the billet holder 22 is wide, it is preferable to make a gap by making the billet holder 22 into a coil spring shape, for example.
[0026]
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, between the arrangement pitches of the conveying rollers 28, The lower surface of the inner periphery of the billet holder 22 is positioned slightly below the conveying surface of the conveying roller 28, so that the billet 10 can be surely scooped up. Further, in this case, the roller conveyor 4 is driven and driven and controlled separately from the preceding slat conveyor 2 so that the conveying speed is higher than that of the preceding slat conveyor 2 and fast-forwarded to the leading billet 10 that enters. Thus, the coating processing time in the dipping device 8 can be appropriately secured.
[0027]
Only one of the revolvers 18 and 19 may be provided at the front and rear, and in this case, it is not necessary to stop at the standby position (3). However, as shown in the figure, two revolvers 18 and 19 are provided facing each other. While the billet 10 is soaked, the waiting time can be effectively used by scooping up the next billet 10 with the other revolver 19 and the processing speed can be doubled.
[0028]
The preheating heater 3, the dipping device 8, and the heating heater 6 are preferably arranged so that the billet conveyance axis is aligned as shown in the figure. As a result, the efficiency of the installation space is improved, and the posture of the billet 10 can be maintained in the same direction during conveyance, so that the delivery of the billet between the dipping device 8 and the preheating heater 3 and the heating heater 6 is simplified. Control of the timing of billet feeding to the dipping device 8 that rotates and reverses while holding 10 is facilitated. In the above embodiment, the billet shape is a cylindrical shape. However, the billet heater according to the present invention can also handle a polygonal columnar billet such as a square or hexagon. On the other hand, the billet holder 22 is not necessarily 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 have to be completely closed, and may be a C-shape in which a part thereof is cut out as long as the retained billet does not fall off.
[0029]
【Effect of the invention】
As described above, according to the present invention, since the structure of the dipping device is simple and easy to control, and there is little fear of failure due to the lubricant, a high-speed and stable coating process is possible and the lubricant for the billet The quality of the coating process is improved because the surroundings are reliable.
[Brief description of the drawings]
FIG. 1 is a plan view of a billet heater showing an embodiment of the present invention.
FIG. 2 is a side view of FIG.
FIG. 3 is a perspective view showing the shape of a billet.
4 is an enlarged plan view of the dipping device in FIG. 1. FIG.
5 is a cross-sectional view taken along line VV in 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. FIG.
8 is an enlarged sectional view taken along line VIII-VIII in FIG.
9 is an enlarged cross-sectional view taken along the line IX-IX in FIG.
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 Preheating heater 4 Roller conveyor 5 Slat conveyor 6 Heating heater 7 Chain conveyor 8 Dipping apparatus 9 Material supply apparatus 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 Revolving arm 22 Billet holder 23 Bearing 24 Mount 25 Pinion 26 Rack 27 Air cylinder 28 Transport roller 47 Control device

Claims (6)

A preheating heater for preheating the billet, a dipping device for immersing the preheated billet in a forging lubricant in a dipping tank and coating the forging lubricant on the surface thereof, and the billet coated with the forging lubricant In a billet heater for warm forging comprising a heater for heating
The dipping device comprises a revolver comprising a horizontal rotating shaft that is driven to rotate in both directions, and a swivel arm that is supported by the rotating shaft and has a billet holder that is formed of an annular body whose axis is parallel to the rotating shaft. the preparation for the liquid level above the forging lubricant, the revolver is waiting for the pivot arm to one side conveying position of the rotary shaft, the said billet is conveyed in a tandem state from the pre-heaters one by one The billet is received and held in the billet holder, and then the swivel arm is swung to the dipping position on the side opposite to the rotating shaft to immerse the billet in the forged lubricant, and then the swivel arm is moved to the dipping position and the transfer position. said to the standby position of the liquid surface above the forging lubricant paused by inverting the intermediate, then, is reversed returning the swivel arm to the transfer position, the billet After out towards the serial heater, warm forging billet heater, characterized by waiting on the acceptance of the next of said billet. A preheating heater for preheating the billet, a dipping device for immersing the preheated billet in a forging lubricant in a dipping tank and coating the forging lubricant on the surface thereof, and the billet coated with the forging lubricant In a billet heater for warm forging comprising a heater for heating
The dipping device comprises a revolver comprising a horizontal rotating shaft that is driven to rotate in both directions, and a swivel arm that is supported by the rotating shaft and has a billet holder that is formed of an annular body whose axis is parallel to the rotating shaft. Above the liquid level of the forged lubricant, the revolver waits for the swivel arm at a transfer position on one side of the rotating shaft, and the billets conveyed in a tandem state from the preheating heater one by one. Received and held in the billet holder, and then swiveling the swivel arm to the dipping position on the opposite side of the rotating shaft to immerse the billet in the forged lubricant, and then reversing the swivel arm back to the transfer position; after unloading towards the billet to the heater, there is to wait in preparation for receiving the next of the billet, the revolver plurality of orbiting earth The has a comb shape, warm forging billet heater, characterized in that retaining spanned the billet between the plurality of the billet holder. A roller conveyor that conveys the billet across the dipping tank is installed between the preheating heater and the heating heater, the roller conveyor has a plurality of conveyance rollers that are driven to rotate, and the revolver is located at the conveyance position. 3. The apparatus according to claim 1, wherein the billet holder is made to enter between the arrangement pitches of the conveying rollers, and the lower surface of the inner periphery of the ring is positioned below the conveying surface of the conveying rollers and waits. The billet heater for warm forging as described in any one. Warm forging billet heater according to any one of claims 1 to 3, characterized in that it comprises 2 groups facing each other across the central axis in the longitudinal direction of the dipping apparatus of the revolver. While the swivel arm of the one revolver is in the transport position, the swivel arm of the other revolver temporarily stops at a standby position between the transport position and the immersion position, and the swivel arm of the one revolver When the billet is received and held and swung to the immersion position, the swivel arm of the other revolver swivels from the standby position to the transport position and waits for the next billet, while the one revolver is on standby. with the of the pivot arm to pause at the waiting position while holding the billet after coating, then the pivot arm of the other revolver is pivoted to said immersion position holding accept following the billet, the one 's pivot arm revolver after unloading the billets and returned to the transport position from the standby position, the following Waiting on the acceptance of the billet, while, for warm forging according to claim 4, wherein the swivel arm of the other revolver, characterized in that the pause at the waiting position while holding the billet after coating Billet heater. Before SL preheater, the dipping device and the heater is warm forging billet heater according to any one of claims 1 to 5, characterized in that the billet conveying axis is arranged such that a straight line .