JP2019126812A - Roll forging mold type preheating device of roll forging machine - Google Patents

Abstract

To provide a roll forging mold type preheating device of a roll forging machine which reduces a decrease in material temperature during hot forging.SOLUTION: A first roll forging mold 3A keeps two electrothermal heaters 51 inserted in parallel with the axial direction of a first roll axis 2A. The first roll forging mold 3A keeps the electrothermal heaters 51 inserted in two stop holes 37 formed in parallel with the axial direction of the first roll axis 2A. The first roll forging mold 3A keeps two electrothermal heater terminals 52 connected with each of the two electrothermal heaters 51 fixed on a right side face 33. A clamp ring 4 keeps two slip ring terminals 53 that energize on contact with the two electrothermal heater terminals 52 fixed on a left side face 41. The electrothermal heater 51 is energized by interlock with the operation of fixing the first roll forging mold 3A on the first roll axis 2A with the clamp ring 4.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a roll forging die preheating apparatus of a roll forging machine for hot forging metal materials. More specifically, the present invention relates to a roll forging die preheating device of a roll forging machine capable of heating the roll forging die to a set temperature in a roll forging machine that performs hot forging on a metal material with a pair of roll forging dies.

  A roll forging machine (also referred to as a forging roll) is known as a type of forging machine for forging a forged product (forged product) which is a metal part (see, for example, Patent Document 1). In recent years, for example, in forging of an aluminum material, the strength of the aluminum material after forging has been increased by raising the forging temperature (for example, heating the aluminum material to about 500 ° C. in a heating furnace). Since the heating temperature of the aluminum material in the heating furnace is constant, it is necessary to reduce the temperature drop of the aluminum material at the time of forging. In order to reduce the temperature drop of the aluminum material, it is necessary to shorten the forging time and to reduce the temperature drop of the aluminum material in the cold roll forging die.

  Moreover, in the case of hot forging, in the roll forging machine, the length and shape of the aluminum material after forging changes because the temperature of the roll forging die changes (temperature rises) immediately after the start of forging in the morning and during forging. To do. That is, the processing conditions slightly change due to the expansion and contraction of the roll forging die and the change of the friction coefficient due to the temperature change, and the shape of the aluminum material after forging becomes uneven. If the shape of the aluminum material after forging is unstable, forging defects such as thinning in the subsequent press forging and changes in burrs occur, which may cause defective quality of the final product.

JP-A-5-169176

In order to solve the above-mentioned problems, if the roll forging is performed immediately after the start of production under the same forging conditions (the temperature of the roll forging die is the same) as in the course of production, the occurrence of the subsequent defects is resolved. In order to avoid the temperature drop of the material, the roll forging process is performed in a short time, and the temperature of the roll forging die is kept constant from the start to the end of processing of the lot, and the temperature unevenness of the roll forging die is It is necessary to always keep it constant.
The present invention has been invented against the background as described above, and achieves the following objects.
An object of the present invention is to provide a roll forging die preheating device for a roll forging machine that reduces a decrease in material temperature during hot forging.
Another object of the present invention is to provide a roll forging die preheating device for a roll forging machine that reduces the temperature unevenness of the roll forging die.

The present invention employs the following means in order to solve the above problems.
That is, the roll forging die preheating device of the roll forging machine according to the first aspect of the present invention comprises an airframe constituting a main body, a shaft-like first roll shaft rotatably supported by the body, and an outer periphery of the first roll shaft. A first roll forging die arranged on the surface, a second roll axis arranged parallel to the axis of the first roll axis and rotatably supported by the machine body, and the second roll axis In a roll forging machine comprising a second roll forging die disposed on an outer peripheral surface, the plurality of conductive slip rings fixed to the outer circumferences of the first roll axis and the second roll axis, and provided on the body Conductive brushes, which are respectively pressed to energize the surface of the slip ring, and are respectively disposed in the first roll forging die and the second roll forging die, Electric heating heat connected Characterized in that comprising a chromatography.

  In the roll forging die preheating device of the roll forging machine of the second aspect of the present invention, in the first aspect of the present invention, the clamp ring axially movably disposed on the outer periphery of the first roll axis and the second roll axis; A slip ring terminal mounted on a ring and connected to energize the slip ring, and an electric heater mounted on the first roll forging die and the second roll forging die and connected to the electric heater It comprises a terminal, and a clamp ring driving means for driving the clamp ring in the axial direction in order to make the electric heater terminal and the slip ring terminal contact or non-contact.

  In the roll forging die preheating device of the roll forging machine of the third aspect of the invention, in the first aspect or the second aspect of the invention, the clamp ring includes the first roll forging die and the second roll forging die as the first roll shaft And connecting means for mechanically connecting the first roll forging die and the second roll forging die to be fixed to the second roll shaft, respectively.

  A roll forging die preheating apparatus for a roll forging machine according to a fourth aspect of the present invention is the mold preheating apparatus according to the first or second aspect, wherein the roll forging die preheating apparatus is provided in the vicinity of the roll forging machine separately from the roll forging machine. The mold pre-heating device includes a third roll forging die for hot forging a part different from the part for which the first roll forging die and the second roll forging die are hot forged, And / or a fourth roll forging die that can be carried in, the electric heater disposed in the third roll forging die and / or the fourth roll forging die, and connectable to the slip ring, and the electric heater An electric heater terminal connected to the electric heater, energizing the electric heater terminal, preheating the third roll forging die and / or the fourth roll forging die to a predetermined temperature, Oita third row Carrying out the forging die and / or the fourth roll forging die from the die support and attaching the forging die and / or the fourth roll forging die to the outer peripheral surface of the first roll shaft and / or the second roll shaft of the roll forging machine Features.

  The roll forging die preheating device of the roll forging machine of the fifth invention is provided in the machine body in one of the items selected from the first to fourth inventions, and when the rotation of the first roll shaft and the second roll shaft is stopped. In order to measure the surface temperature of each of the first roll forging die and the second roll forging die, the outer circumference of each of the first roll forging die and the second roll forging die is not It is characterized by comprising: a radiation temperature measuring means disposed in contact; and a temperature control means for controlling power supplied to the electric heater in accordance with the temperature measured by the radiation temperature measuring means.

  The roll forging die preheating device of the roll forging machine of the present invention can keep the temperature of the roll forging die within a predetermined temperature range from immediately after the start of production to the end of production. Accordingly, since the temperature drop of the material during forging can be reduced, the strength of the material after forging can be increased. Further, since the temperature unevenness of the roll forging die is reduced, the expansion and contraction of the roll forging die and the change of the friction coefficient are reduced, and the shape of the material after forging becomes uniform.

FIG. 1 is an overall front view showing a roll forging machine of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 3 is a cross-sectional view taken along the line B-B of FIG. 2, and is a cross-sectional view showing only the right half of the first roll shaft and the second roll shaft in the axial direction from substantially the center position. 4 is a cross-sectional view taken along the line CC of FIG. 5 is a cross-sectional view taken along the line DD of FIG. 6 is a cross-sectional view taken along line EE in FIG. FIG. 7 is a cross-sectional view taken along the line F-F in FIG. 5, showing a state in which the first roll forging die is fixed to the first roll shaft, and showing the total length in the axial direction of the first roll shaft. FIG. 8 is a view corresponding to FIG. 7 showing a state in which the fixing of the first roll forging die to the first roll axis is released. FIG. 9 is an enlarged cross-sectional view taken along line GG in FIG. FIG. 10 is an overall front cross-sectional view showing a mold preheating device provided separately from the roll forging machine of the present invention. FIG. 11 is a P arrow view of FIG. FIG. 12 is a view taken in the direction of the arrow Q in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is an overall front view showing a roll forging machine 1 according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG. It is sectional drawing which shows only the right side half from the approximate center position of the axial direction length of an axis | shaft and a 2nd roll axis | shaft. 4 is a cross-sectional view taken along the line C-C in FIG. 3, FIG. 5 is a cross-sectional view taken along the line D-D in FIG. 3, FIG. 6 is a cross-sectional view taken along the line E-E in FIG. It is a sectional view showing the state which fixed the 1st roll forge metallic mold to the 1st roll axis, and showing the full length of the direction of an axis of the 1st roll axis. FIG. 8 is a view corresponding to FIG. 7 showing a state in which the fixing of the first roll forging die to the first roll axis is released. FIG. 9 is an enlarged cross-sectional view taken along line GG in FIG. As shown in FIGS. 1 and 2, a roll forging machine 1 according to an embodiment of the present invention has a flat base 10 fixed on a floor surface, and stands on the left side (as viewed in FIG. 1) of the base 10. It is composed of a box-shaped head 11 provided and a columnar column 12 erected on the upper surface on the right side (as viewed in FIG. 1) of the base 10. The base 10, the head 11, and the column 12 constitute an airframe which is a main body of the roll forging machine 1 according to the embodiment of this invention.

  Between the head 11 and the column 12, shaft-shaped first roll shaft 2A and second roll shaft 2B are rotatably supported. The first roll axis 2A and the second roll axis 2B are arranged horizontally as viewed in FIG. 1, and the first roll axis 2A is arranged directly above the second roll axis 2B, and the horizontal axis of the first roll axis 2A And the horizontal axis of the second roll shaft 2B are arranged in parallel in the same vertical plane parallel to the paper surface. 1, the left ends of the first roll shaft 2A and the second roll shaft 2B are rotatably supported by the head 11, and the right ends of the first roll shaft 2A and the second roll shaft 2B are rotatably supported by the column 12. Has been. A fan-shaped first roll forging die 3A is detachably attached to the outer peripheral surface of the substantially central portion in the axial direction of the first roll shaft 2A. A fan-shaped second roll forging die 3B is detachably attached to the outer peripheral surface of the substantially central portion of the second roll shaft 2B in the axial direction. As shown in FIGS. 1 and 2, a motor 14 is attached to a motor support plate 13 fixed to the upper surface of the head 11. A small pulley 15 is attached to the output shaft of the motor 14, and the rotation of the motor 14 is transmitted from the small pulley 15 to the large pulley 16 via the belt 17. The rotation of the large pulley 16 is transmitted to the first roll shaft 2A and the second roll shaft 2B via a transmission mechanism (not shown), and the first roll shaft 2A and the second roll shaft 2B rotate in synchronization.

  A raw material (for example, an aluminum material) is heated in a heating furnace (not shown), the heated material is gripped by fingers (not shown), and a plurality of forming grooves 38 of the first roll forging die 3A and the second roll forging die 3B are rotated. When sequentially inserted, the material can be hot forged into a predetermined shape. As shown in FIGS. 1 and 2, radiation thermometers (radiation temperature measuring means) 18A and 18B are attached to the head 11 via stays 181A and 181B. The radiation thermometer 18A is arranged in non-contact with the outer periphery of the upper first roll forging die 3A, and the radiation thermometer 18B is in non-contact with the outer periphery of the lower second roll forging die 3B. It arrange | positions and measures each surface temperature of 1st roll forge metal mold | die 3A and 2nd roll forge metal mold | die 3B. The measurement of the surface temperature is performed when the first roll shaft 2A and the second roll shaft 2B are stopped at a predetermined constant angular position. The first roll shaft 2A and the second roll shaft 2B stop at predetermined angular positions each time hot forging of one material is completed. Therefore, the surface temperature of each specified surface of the first roll forging die 3A and the second roll forging die 3B is measured by the radiation thermometers 18A and 18B each time the hot forging of one material is finished. To do.

  Next, connection means for mechanically connecting the first roll forging die 3A and the second roll forging die 3B to the first roll shaft 2A and the second roll shaft 2B, the first roll forging die 3A and the second roll forging die 3B. An electric heater for heating the two-roll forging die 3B and a slip ring and a brush for energizing the electric heater will be described. Since these structures are exactly the same for the first roll shaft 2A and the second roll shaft 2B, only the first roll shaft 2A side will be described, and description of the second roll shaft 2B side will be omitted. As shown in FIGS. 3 to 9, the key 21 having a rectangular cross section and the key 22 smaller than the key 21 and having a trapezoidal cross section are fixed to the first roll shaft 2A by bolts. As shown to FIG. 3, FIG. 5, the key 21 and the key 22 are arrange | positioned in the position which the outer peripheral surface of 1st roll axis 2A opposes. The right end surface 31 of the fan-shaped first roll forging die 3A is in contact with the key 21, the left end surface 32 of the first roll forging die 3A is in contact with the key 22, and the first roll forging die is applied to the first roll shaft 2A. The mold 3A is prevented from rotating. The first roll forging die 3A is carried in from the upper side to the lower side of FIG. 5, pressed against the first roll shaft 2A, and mounted. The actual carry-in of the first roll forging die 3A uses a die carry-in / out device (not shown), and the first roll forging die 3A is viewed from the front side or the rear side of the roll forging machine 1 as seen in FIG. 2 is performed by horizontally moving in the left-right direction.

  As shown in FIGS. 3 and 5, a sector-shaped engagement convex portion 34 is formed on the right side surface 33 of the first roll forging die 3 </ b> A. As shown in FIGS. 7 and 8, a cylindrical engagement hole 36 is formed on the left side surface 35 of the first roll forging die 3A. A stopper 24 is attached to the left end flange portion 23 of the first roll shaft 2A between the left side surface 35 of the first roll forging die 3A. The engaging pin 25 is attached to the stopper 24 so as to be movable in a direction parallel to the axis of the first roll shaft 2A, and the tip of the engaging pin 25 is made of the first roll forging metal by the biasing force of a spring (compression spring) 26. It is inserted into the engagement hole 36 on the left side surface 35 of the mold 3A.

  A clamp ring 4 is externally fitted on the outer periphery of the first roll shaft 2A so as to be movable in the axial direction of the first roll shaft 2A. The clamp ring 4 has a cylindrical shape and is locked by the key 21 described above. On the left side surface 41 of the clamp ring 4, a sector-shaped engagement recess (FIGS. 3, 4 and 8) 42 is formed. When the clamp ring 4 moves in the left direction in FIG. 3, the left side surface 41 of the clamp ring 4 abuts on the right side surface 33 of the first roll forging die 3A, and the first roll forging die 3A is in the left direction in FIG. Move to. Then, the left side surface 35 of the first roll forging die 3A abuts on the right side surface 27 of the stopper 24, and the leftward movement of the first roll forging die 3A stops, and the tip of the engagement pin 25 described above Is inserted into the engagement hole 36 on the left side surface 35 of the first roll forging die 3A. Furthermore, the sector-shaped engagement recess 42 of the clamp ring 4 engages with the sector-shaped engagement projection 34 of the first roll forging die 3A to fix the first roll forging die 3A to the first roll shaft 2A To do. That is, the sector-shaped engagement recess 42 of the clamp ring 4 engaged with the sector-shaped engagement convex portion 34 of the first roll forging die 3A fixes the first roll forge die 3A to the first roll shaft 2A. In addition, the connection means for mechanically connecting with the first roll forging die 3A is configured.

  As shown in FIGS. 3 and 6, a small diameter shaft portion 28 is formed on the outer periphery of the first roll shaft 2A, and a fixing ring 43 is externally fitted to the small diameter shaft portion 28 in the axial direction of the first roll shaft 2A. Is externally immovable. The fixing ring 43 is cylindrical and is locked by the key 21 described above. The fixing ring 43 is formed with four cylinders 45 (clamp ring driving means). The cylinders 45 are arranged at four locations (see FIG. 6) that are spaced apart (angles β1, β2, and β3) in the circumferential direction of the fixing ring 43. A piston 44 is fitted in each cylinder 45 so as to be movable in the axial direction of the first roll shaft 2A. A spring 46 always biases the piston 44 in the left direction in FIG. A piston rod 47 is formed integrally with the piston 44. The left end of the piston rod 47 is fixed to the right side surface 48 of the clamp ring 4 at a bolt 49 (at the positions of angles β3, β2 and β1 spaced apart in the circumferential direction of FIG. 4). The piston rod 47 passes through a cylinder cover 451 that covers the cylinder 45 and extends to the left in FIG. When the piston 44 is moved leftward in FIG. 3 by the biasing force of the spring 46 and hydraulic pressure (pressure oil is supplied to the right cylinder chamber of the piston 44), the clamp ring 4 is moved leftward in FIG. The roll forging die 3A can be fixed to the first roll shaft 2A. When the pressure oil is supplied to the left cylinder chamber of the piston 44, the piston 44 moves rightward in FIG. 3, and the clamp ring 4 moves rightward in FIG. Then, the fixing of the first roll forging die 3A to the first roll shaft 2A can be released. Even if the hydraulic pressure drops for some reason, it is preferable because the fixed state of the first roll forging die 3A with respect to the first roll shaft 2A can be maintained by the biasing force of the spring 46.

  As shown in FIGS. 7 and 8, two electric heat heaters 51 are inserted in the first roll forging die 3A in parallel to the axial direction of the first roll shaft 2A. Electric heaters 51 are respectively inserted into two blind holes 37 formed in the first roll forging die 3A in parallel to the axial direction of the first roll shaft 2A. Two electric heat heater terminals 52 connected to each of the two electric heat heaters 51 are fixed to the right side surface 33 of the first roll forging die 3A. The electric heater terminals 52 and the electric heater 51 are disposed at two places separated by an angle α in the circumferential direction of the first roll forging die 3A as viewed in FIG. Two slip ring terminals 53 that are in contact with the electric heater terminal 52 and energize are fixed to the left side surface 41 of the clamp ring 4. The slip ring terminals 53 are arranged at two locations (same phase as the above-described electric heater terminal 52) separated by an angle α in the circumferential direction of the clamp ring 4 as viewed in FIG.

  When the piston 44 is moved in the left direction in FIG. 7 by the biasing force of the spring 46 in FIG. 3 and the clamp ring 4 is moved in the left direction in FIG. 7, the slip ring terminal 53 comes into contact with the electric heater terminal 52. It becomes possible to energize 51 and heat the electric heater 51. Pressure oil is supplied to the left cylinder chamber of the piston 44 in FIG. 3 to move the piston 44 to the right in FIG. 7, and the clamp ring 4 to the right in FIG. Then, the electric heater terminal 52 and the slip ring terminal 53 are not in contact with each other, and it is possible to cut off energization to the electric heater 51. That is, the electric heater 51 can be energized in conjunction with the operation of fixing the first roll forging die 3A to the first roll shaft 2A with the clamp ring 4. Further, interlocking with the operation of releasing the fixing of the first roll forging die 3A with respect to the first roll shaft 2A by the clamp ring 4, it becomes possible to shut off the electric heater 51.

  As shown in FIGS. 3 to 9, the slip ring device 6 is fixed on the right side of the fixing ring 43 on the outer periphery of the first roll shaft 2A. That is, as shown in FIG. 3, the cylindrical slip ring housing 61 of the slip ring device 6 is fixed to the outer periphery of the first roll shaft 2A with the bolts 62. Further, as shown in FIGS. 3 to 9, two conductive and hollow disk-like slip rings (for example, copper plates) 63 and 64 are fixed to the slip ring housing 61. Rod terminals 65 are connected to the slip rings 63 and 64 by bolts, respectively, and the rod terminals 65 are connected to two slip ring terminals 53 by conductors 631 and 641. The conducting wires 631 641 are connected to the two slip ring terminals 53 through through holes 431 parallel to the axial direction of the fixing ring 43. As shown in FIGS. 7 and 8, a conductive wire guide block 54 is attached to the left side surface of the slip ring housing 61, and guides the conductive wires 631 and 641 from the slip rings 63 and 64 to the through holes 431 of the fixing ring 43. Yes. Further, as shown in FIG. 6 to FIG. 8, a conducting wire guide block 55 is attached to the right side surface of the clamp ring 4, and the conducting wires 631 and 641 are guided from the slip ring terminal 53 to the through holes 431 of the fixing ring 43. Yes.

  Further, as shown in FIG. 3 to FIG. 9, the brush device 7 is fixed to the column 12. That is, as shown in FIG. 3, the hollow cylindrical brush housing 71 of the brush device 7 is disposed on the outer periphery of the slip ring housing 61, and is fixed to the column 12 by a bolt 72. Two brush holders 73 and 74 are attached to the brush housing 71. The brush holders 73 and 74 are disposed at positions separated by an angle γ in the circumferential direction of the brush housing 71 as viewed in FIG. Further, the brush holders 73 and 74 are disposed at positions separated in the axial direction of the brush housing 71 (the left and right direction in FIGS. 7 and 8) as viewed in FIGS. 7 and 8. In FIGS. 7 and 8, only one brush holder 73 is visible. The brush holder 73 incorporates a conductive brush (for example, a carbon brush) 75 in contact with the outer peripheral surface of the slip ring 63. The brush 75 is constantly pressed against the outer peripheral surface of the slip ring 63 by a spring 76 and energizes the rotating slip ring 63. The internal structure of the brush holder 74 has the same shape (not shown) as the brush holder 73, and the brush 75 of the brush holder 74 energizes the rotating slip ring 64. Although not shown, the electric heater terminal 52, the slip ring terminal 53, and the slip ring device 6 are all sealed with an O-ring or the like for the energized portion to prevent oil and water from entering the energized portion, Is preventing. In order to lubricate the mold, the oil mist is sprayed on the first roll forging mold 3A and the second roll forging mold 3B, but since the leakage of the current-carrying part can be prevented during the oil mist spraying, The safety is improved, and a drop in the operating rate due to a failure can be prevented.

  Next, the roll forging die preheating operation of the roll forging machine 1 according to the embodiment of the present invention will be described. At the start of production in the morning or when the operation stop time is long, an operation preparation button (not shown) of the roll forging machine 1 is activated. Then, the temperature control device (temperature control means) 19 shown in FIG. 7 operates, and the first roll forging die 3A and the second roll forging die 3B fixed to the first roll shaft 2A and the second roll shaft 2B. The electric heater 51 is heated. The electric heater 51 heats until the first roll forging die 3A and the second roll forging die 3B reach a predetermined temperature (for example, 200 degrees). The surface temperature of each of the first roll forging die 3A and the second roll forging die 3B is measured by the radiation thermometers 18A and 18B, and the temperature control device 19 stops the heating of the electric heater 51 when the predetermined temperature is reached. .

  Next, the first roll forging die 3A and the second roll forging die 3B are synchronously rotated. When a material (for example, an aluminum material) heated to a predetermined temperature in a heating furnace is gripped by a finger (not shown) and sequentially inserted into the plurality of forming grooves 38 of the first roll forging die 3A and the second roll forging die 3B, the material Can be hot forged into a predetermined shape. When the material for which hot forging is finished is discharged by a finger, the rotation of the first roll shaft 2A and the second roll shaft 2B is stopped. Next, the surface temperature of each of the first roll forging die 3A and the second roll forging die 3B is measured by the radiation thermometers 18A and 18B. If the surface temperature is lower than a predetermined temperature (for example, 200 ° C.), the temperature control device 19 heats the electric heater 51 of the first roll forging die 3A and the second roll forging die 3B. If the surface temperature is higher than a predetermined temperature (for example, 200 ° C.), the temperature control device 19 stops the heating of the electric heater 51 of the first roll forging die 3A and the second roll forging die 3B. In this way, the temperature control device 19 controls the temperature of the first roll forging die 3A and the second roll forging die 3B during the continuous operation to a predetermined temperature range (for example, 200 ° ± 25 °).

  The case of hot forging the material of another part during continuous operation will be described. In this case, a die preheating device (shown in FIGS. 10 to 12) 8 prepared separately from the roll forging machine 1 described above is used. FIG. 10 is an overall front view showing a part of the die preheating device 8 provided separately from the roll forging machine 1 of the present invention, FIG. 11 is a view taken in the direction of arrow P in FIG. 10, and FIG. It is Q arrow view. As shown in FIGS. 10 to 12, the mold mounting table 81 of the mold preheating device 8 is fixed on the floor surface in the vicinity of the roll forging machine 1, separately from the base 10. The third frame forging die 3C or the fourth roll forging die 3D for another component is carried in and placed on the rectangular frame-shaped die placing table 81. The third roll forging die 3C can be mounted on the outer peripheral surface of the first roll shaft 2A, and the fourth roll forging die 3D can be mounted on the outer peripheral surface of the second roll shaft 2A.

  The third roll forging die 3C and the fourth roll forging die 3D have the same structure as the first roll forging die 3A and the second roll forging die 3B described above, and only the shape of the forming groove 38 is different. That is, in the third roll forging die 3C and the fourth roll forging die 3D, an electric heater 51 connectable to the slip rings 63 and 64 and an electric heater terminal 52 connected to the electric heater 51 are attached. It has been. In the mold mounting table 81, connection terminals 83 and 83 are connected to a terminal box 82 by flexible cables 84 and 84. The terminal box 82 is connected to a power source by a cable (not shown). The connection terminals 83 and 83 have substantially the same structure as the slip ring terminal 53. The fan-shaped third roll forging die 3C and the fourth roll forging die 3D are suspended by a wire and carried onto the die mounting table 81, and placed on the die mounting table 81 with the fan-shaped concave surface down. . Thereafter, the connection terminals 83 and 83 are manually connected to the electric heater terminals 52 and 52.

  A radiation thermometer 86 is attached to the mold table 81 via a stay 87. The radiation thermometer 86 has the same structure as the radiation thermometers 18A and 18B, and is disposed in noncontact with the outer periphery of the third roll forging die 3C and / or the fourth roll forging die 3D, The surface temperature of the forging die 3C and / or the fourth roll forging die 3D is measured. Electricity is supplied to the electric heater 51 of the third roll forging die 3C and / or the fourth roll forging die 3D for another part, and preheated to a predetermined temperature (for example, 200 ° C.). That is, the surface temperature of the third roll forging die 3C and / or the fourth roll forging die 3D is measured by the radiation thermometer 86, and a temperature control device (not shown) stops heating the electric heater 51 when the temperature reaches a predetermined temperature. To do. The first roll forging die 3A and the second roll forging die 3B are removed from the roll forging machine 1, and the third roll forging die 3C and / or the fourth roll forging die for another part which has been preheated. Swap to 3D.

  As a result, it is possible to shorten the time until starting the hot forging of another part, and it is possible to extend the operation time of the roll forging machine 1. It is preferable to install two mold preheating devices 8 shown in FIGS. 10 to 12 and to simultaneously preheat the third roll forging mold 3C and the fourth roll forging mold 3D. That is, since the third roll forging die 3C and / or the fourth roll forging die 3D reach the predetermined temperature almost simultaneously, it is possible to shorten the time until starting the hot forging of another part. Also, the area of the mold base of one mold preheating device 8 is enlarged, and both the third roll forging mold 3C and the fourth roll forging mold 3D are placed at the same time, and the third roll forging mold Both 3C and the fourth roll forging die 3D may be preheated simultaneously.

  In the roll forging die preheating device of the roll forging machine according to the embodiment of the present invention, the temperature of the roll forging die can be kept in a predetermined temperature range from the start of production to the end of production. Accordingly, since the temperature drop of the material during forging can be reduced, the strength of the material after forging can be increased. Further, since the temperature unevenness of the roll forging die is reduced, the expansion and contraction of the roll forging die and the change of the friction coefficient are reduced, and the shape of the material after forging becomes uniform.

As mentioned above, although the Example of this invention was described, this invention is not limited to this Example. For example, in the embodiment described above, in conjunction with the operation of fixing the roll forging die to the roll shaft with the clamp ring, the electric heater terminal of the roll forging die is brought into contact with the slip ring terminal of the clamp ring to energize the electric heater. doing. However, the operation of clamping the roll forging die to the roll shaft may not be interlocked with the operation of bringing the electric heater terminal and the slip ring terminal into contact and energizing the electric heater.
In the embodiment described above, two electric heat heaters are inserted in the first roll forging die, the second roll forging die, the third roll forging die, and the fourth roll forging die. However, depending on the size and volume of the roll forging die, the predetermined heating temperature of the roll forging die, and the scheduled time required to heat to the predetermined heating temperature, the number of electric heaters, the capacity of the electric heaters, the size of the electric heaters You should decide.

DESCRIPTION OF SYMBOLS 1 ... Roll forging machine 10 ... Base 11 ... Head 13 ... Column 13 ... Motor support plate 14 ... Motor 15 ... Small pulley 16 ... Large pulley 17 ... Belt 18A, 18B ... Radiation thermometer 181A, 181B ... Stay 19 ... Temperature control apparatus 2A: first roll shaft 2B: second roll shaft 21, 22: key 23: left end flange portion 24: stopper 25: engagement pin 26: spring 27: right side surface 28: small diameter shaft portion 3A: first roll forging die 3B: second roll forging mold 3C: third roll forging mold 3D: fourth roll forging mold 31: right end face 32: left end face 33: right side face 34: engagement convex portion 35: left side face 36: engagement Hole 37: Blind hole 38: Forming groove 4: Clamp ring 41: Left side surface 42: Engaging recess 43: Fixing ring 431: Through hole 44: Piston 45: Cylinder 451: Cylinder cover 46: Spring 47: Piping 47 Ton rod 48: right side surface 49: bolt 51: electric heating heater 52: electric heating heater terminal 53: slip ring terminal 54, 55: lead wire guide block 6: slip ring device 61: slip ring housing 62: bolt 63, 64: slip ring 631, 641 ... Lead wire 65 ... Rod terminal 7 ... Brush device 71 ... Brush housing 72 ... Bolt 73, 74 ... Brush holder 75 ... Brush 76 ... Spring 8 ... Mold preheating device 81 ... Mold stand 82 ... Terminal box 83 ... Connection terminal 84 ... Flexible cable 85 ... Wire 86 ... Radiation thermometer 87 ... Stay

Claims (5)

The aircraft that makes up the body,
A shaft-shaped first roll shaft rotatably supported by the machine body;
A first roll forging die disposed on an outer peripheral surface of the first roll shaft;
A shaft-like second roll shaft disposed parallel to the axis of the first roll shaft and rotatably supported by the machine body;
A roll forging machine comprising: a second roll forging die arranged on an outer peripheral surface of the second roll shaft;
A plurality of conductive slip rings fixed to the outer periphery of the first roll shaft and the second roll shaft;
A plurality of conductive brushes provided on the body and pressed to energize the surfaces of the slip rings;
A roll forging die preheating device for a roll forging machine, comprising: an electric heater disposed in each of the first roll forging die and the second roll forging die and connected to the slip ring. In the roll forging die preheating device of the roll forging machine according to claim 1,
A clamp ring disposed on the outer periphery of the first roll shaft and the second roll shaft so as to be movable in the axial direction;
A slip ring terminal mounted on the clamp ring and connected to energize the slip ring;
An electric heater terminal mounted on each of the first roll forging die and the second roll forging die and connected to the electric heater;
And a clamp ring drive means for driving the clamp ring in the axial direction in order to bring the electric heater terminal and the slip ring terminal into contact with or out of contact with each other, and roll forging die of a roll forging machine. Preheater. In the roll forging die preheating device of the roll forging machine according to claim 1 or 2,
The clamp ring is configured to fix the first roll forging die and the second roll forging die to the first roll shaft and the second roll shaft, respectively. A roll forging die preheating device for a roll forging machine, characterized by having a connecting means for mechanically connecting to a two-roll forging die. In the roll forging die preheating device of the roll forging machine according to claim 1 or 2,
A die preheating device provided separately from the roll forging machine in the vicinity of the roll forging machine,
A third roll forging metal for hot forging a part other than a part to which the first roll forging mold and the second roll forging mold are hot forged in a mold holder of the mold preheating device. The mold and / or the fourth roll forging die can be carried in,
An electric heater disposed in each of the third roll forging die and / or the fourth roll forging die and connectable to the slip ring;
It consists of an electric heater terminal connected to the electric heater,
Energizing the electric heater terminal, preheating the third roll forging die and / or the fourth roll forging die to a predetermined temperature,
The previously heated third roll forging die and / or the fourth roll forging die are carried out from the die support, and the first roll shaft and / or the first forging of the roll forging machine are carried out. A roll forging die preheating device for a roll forging machine, which is mounted on the outer peripheral surface of a two roll shaft. In the roll forging die preheating device of the roll forging machine according to claim 1, selected from claims 1 to 4,
In order to measure the surface temperature of each of the first roll forging die and the second roll forging die, provided on the body, when the rotation of the first roll shaft and the second roll shaft is stopped. A radiation temperature measuring means arranged in a non-contact manner with respect to the outer periphery of each of the one roll forging die and the second roll forging die;
A roll forging die preheating device for a roll forging machine, comprising: temperature control means for controlling the power supplied to the electric heater in accordance with the temperature measured by the radiation temperature measuring means.

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