JP2015030029A - Ring rolling mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately forge and shape an asymmetric irregular-shaped cross-sectional ring 50, while being a comparatively simple constitution, in a ring rolling mill 1.SOLUTION: A peripheral groove 2a is provided on an outer peripheral surface of a main drive roll 2, and an inclined plane 2b is provided on the opening side in one inner wall surface of the peripheral groove 2a. Control systems (21 to 26 and 30) allow an outer peripheral surface of a flange part 52 of the asymmetric irregular-shaped cross-sectional ring 50 to abut on a bottom surface of the peripheral groove 2a of the main drive roll 2 by sliding a mandrel 3, and also to abut on a small end surface 54 on the upper end side in the axial direction and a large end surface 55 on the lower end side in the axial direction of the asymmetric irregular-shaped cross-sectional ring 50 by sliding upper-lower edge rolls 4 and 5, and them, rotatingly drive the main drive roll 2 at a constant speed, and individually control a rotating speed of the upper-lower edge rolls 4 and 5 on the basis of peripheral velocity of a central position 400 in the axial direction of a boss part 51 of the asymmetric irregular-shaped cross-sectional ring 50 at its time.

Description

  The present invention relates to a ring rolling mill that forges and shapes an asymmetrical irregular cross-section ring as a workpiece.

  Generally, a ring rolling mill is configured to be forged and shaped so as to increase the inner and outer diameter dimensions while reducing the radial thickness of a ring as a processing target.

  The ring rolling mill includes, for example, a pressure roll (33), an insertion roll (35), and upper and lower edge rolls (36, 36) as shown in FIG.

  The pressure roll is attached so as to be rotationally driven on one end side in the longitudinal direction of a bed (31 in FIG. 3) of a ring rolling mill, and a ring (working object in FIG. 3) is formed on the outer peripheral surface thereof. The outer peripheral surface of W) is brought into contact.

  The insertion roll is attached to a moving frame (34 in FIG. 3) that is slidable in the longitudinal direction on the bed so as to be idled, and is inserted into the center hole of the ring.

  The upper and lower edge rolls are formed in a conical shape, and are respectively attached to the moving frame so as to be idled. The upper edge roll is in contact with the small end face on the upper end side in the axial direction of the ring, and the lower edge roll is in contact with the large end face on the lower end side in the axial direction of the ring.

  The processing operation of such a rolling mill will be briefly described. First, in a state where the insertion roll is inserted through the center hole of the ring in a rough ground heated to a high temperature, the outer peripheral surface of the ring is moved to the outer side of the pressure roll by bringing the insertion roll closer to the pressure roll side. And the upper edge roll and the lower edge roll are brought into contact with the small end face and the large end face of the ring.

  Thereafter, the ring, the insertion roll, and the upper and lower edge rolls are driven to rotate by rotating the pressure roll, and the insertion roll is slid so as to gradually approach the pressure roll side. Let Thereby, the radial thickness (wall thickness) of the ring is gradually reduced and the inner and outer diameters of the ring are gradually enlarged. Then, the small and large end surfaces of the ring are leveled by the upper and lower edge rolls, and the axial dimension of the ring is adjusted.

Japanese Patent No. 2808035

  In the conventional ring rolling mill according to Patent Document 1, the object to be processed is limited to a rectangular cross-section ring, and for example, an asymmetric deformed cross-section ring 50 as shown in FIG. 13 is forged and shaped. Not.

  The asymmetric modified cross-section ring 50 is provided with a flange portion 52 projecting radially outward at one end side in the axial direction of a cylindrical boss portion 51 and having an outer diameter from the boss portion 51 toward the flange portion 52 in a rough ground state. It is what provided the inclined part 53 which increases gradually.

  As a ring rolling mill capable of forging and shaping the asymmetrical profile cross-section ring 50, for example, as shown in FIG. 13, a horizontal axis support configuration in which a central axis 71 of a mandrel (corresponding to the insertion roll) 61 is substantially horizontal. It is known that the left and right main drive rolls 62 and 63 arranged side by side in the direction along the central axis 71 of the mandrel 61 are individually driven to rotate.

  The rotation axes 72 and 73 of the two left and right main drive rolls 62 and 63 are inclined with respect to the center axis 71 of the mandrel 61 and are opposite to each other.

  The main drive roll 62 on the left side in the figure is configured to come into contact with the small end surface 54 of the asymmetric deformed cross-section ring 50 and the outer peripheral surface 53a of the inclined portion 53. The main drive roll 63 on the right side in the figure is The large end surface 55 of the asymmetrical irregular cross-section ring 50 and the flat outer peripheral surface 52a of the flange portion 52 are brought into contact with each other.

  In the case of such a ring rolling mill using two left and right main drive rolls 62 and 63, considering that the peripheral speed is different between the minimum outer diameter position and the maximum outer diameter position on the outer peripheral surface of the asymmetric deformed cross-section ring 50, the left side The rotational speed of the main drive roll 62 and the rotational speed of the right main drive roll 63 can be individually controlled. In such a ring rolling mill, the left and right main drive rolls 62 and 63 are required, the number of main drive rolls is increased, the outer shape thereof becomes very complicated, and the control form of the rotational drive is complicated. There is a concern that the manufacturing cost increases.

  In view of such circumstances, the present invention is provided with a flange portion projecting radially outward on one axial end side of a cylindrical boss portion, and an inclination in which the outer diameter gradually increases from the boss portion toward the flange portion. In a ring rolling mill for forging and shaping an asymmetrical irregular cross-section ring provided with a portion, an object is to enable accurate forging and shaping of an asymmetrical irregular cross-section ring with a relatively simple configuration.

  The present invention provides an asymmetric modified cross section in which a flange portion projecting radially outward is provided on one axial end side of a cylindrical boss portion and an inclined portion whose outer diameter gradually increases from the boss portion toward the flange portion. A ring rolling mill for forging and shaping a ring is characterized by having the following configuration.

  The ring rolling mill according to the present invention includes a main drive roll in which a central axis is in a posture along the vertical direction, and one place on the circumference of the outer peripheral surface of the asymmetrical deformed cross-section ring is in contact, and the central axis is in the vertical direction And a mandrel for pressing the outer peripheral surface of the asymmetric deformed cross-section ring against the main drive roll in a state of being inserted through the center hole of the asymmetric deformed cross-section ring, and the respective center axes are the centers of the main drive rolls And an imaginary straight line passing through the center of the mandrel, which is inclined in a side view and matched in a plan view, and is disposed 180 degrees opposite to the main drive roll around the mandrel. In contact with the small end surface on the upper end side in the axial direction and the large end surface on the lower end side in the axial direction. A conical upper edge roll and a lower edge roll, and the main drive roll, the upper edge roll, and the lower edge roll are individually driven to rotate, and the mandrel, the upper edge roll, and the lower edge roll are individually slid And a control system for making it happen.

  Further, the outer peripheral surface of the main drive roll provided in the ring rolling mill according to the present invention is fitted with the flange portion of the asymmetrical deformed cross-section ring from the initial stage to the intermediate stage of machining, and the outer peripheral surface of the flange portion is A circumferential groove having a bottom surface that can be contacted is provided, and an opening side of one inner wall surface of the circumferential groove is provided on the opening side from the flange portion to the inclined portion of the asymmetric deformed cross-section ring as the processing progresses. An inclined surface with which the inclined portion is brought into contact with the increased amount of material flow is provided.

  Further, the control system provided in the ring rolling mill according to the present invention causes the outer peripheral surface of the flange portion of the asymmetrical irregular cross-section ring to abut on the peripheral groove bottom surface of the main drive roll by sliding the mandrel. By sliding the upper edge roll and the lower edge roll, the main drive roll is kept in contact with the small end face on the axial upper end side and the large end face on the lower end side in the axial direction of the asymmetric deformed cross-section ring. The rotational speed of the upper edge roll and the lower edge roll is individually controlled on the basis of the peripheral speed at the axial center position of the boss portion of the asymmetric deformed cross-section ring that is driven to rotate at a speed. is there.

  The effect | action show | played by such a structure of this invention is demonstrated.

  First, only the flange portion of the asymmetrical profile cross-section ring is brought into contact with the bottom surface of the peripheral groove of the main drive roll from the initial stage to the middle stage of the machining, and the asymmetrical profile cross-section ring with the progress of machining Since the inclined portion is brought into contact with the inclined surface of the main drive roll, a difference occurs between the peripheral speed at the outer periphery of the flange portion and the peripheral speed at the outer periphery of the inclined portion in the process of processing the asymmetrical irregular cross-section ring. However, the period during which the outer peripheral surface of the flange portion and the outer peripheral surface of the inclined portion simultaneously contact the main drive roll is as short as possible. As a result, the occurrence of slipping in a wide area between the main drive roll and the asymmetrical profile cross-section ring is suppressed or prevented.

  In addition, the upper edge roll and the lower edge roll are not driven bodies as in the prior art, but are used as driving bodies, and their rotational speed is set to the peripheral speed at the axially central position of the boss portion of the asymmetric deformed cross-section ring. Are controlled individually based on the above. As a result, although the peripheral speed at the axial center position of the boss portion changes one by one with the progress of the processing of the asymmetric deformed cross section ring, the upper edge roll and the lower edge roll contact the asymmetric deformed cross section ring. The occurrence of slipping at the part is suppressed or prevented.

  These synergistic actions can suppress or prevent the rotational fluctuation of the asymmetric deformed cross-section ring as much as possible in the machining process, so that the center of the asymmetric deformed cross-section ring rotating in the machining process is the center of the virtual straight line. It becomes difficult to move from side to side. As a result, since the behavior of the asymmetric irregular cross-section ring becomes stable during the machining process, it becomes possible to accurately forge and shape the asymmetric irregular cross-section ring. Moreover, in the ring rolling mill according to the present invention, since the two left and right main drive rolls are not used as described in the conventional example of FIG. 13, the configuration becomes relatively simple and an increase in manufacturing cost can be suppressed. .

  Preferably, the control system includes a program memory for storing a data table for variably controlling the rotational speed of the upper edge roll and the lower edge roll individually, and the data table is the asymmetric The initial outer diameter of the axial center position of the boss portion in the deformed cross-section ring and the target outer diameter of the axial center position of the boss portion at the end of processing of the asymmetric deformed cross-section ring are determined in advance, In the process of rotating the main drive roll at a constant speed to process the asymmetric deformed cross-section ring, the change with time of the peripheral speed of the axial intermediate position from the initial process to the end of the process is investigated, and based on the result Can be created.

  In this configuration, the rotational speed of the upper edge roll and the lower edge roll is controlled according to the detection result while detecting, for example, the peripheral speed at the axial intermediate position in real time in the machining process. However, since the control is based on the data table created in advance, the control mode of the rotational speed of the upper edge roll and the lower edge roll can be relatively simplified.

  Preferably, the ring rolling mill includes a left guide roll and a right guide roll that are pressed against left and right symmetrical positions in a semi-circumferential region near the main drive roll on the outer peripheral surface of the asymmetric deformed cross-section ring, and the left guide roll on the front end side. And a left arm and a right arm that are individually supported and whose base end side is supported so as to be pivotable on both sides of the imaginary straight line, and elastically bias the left arm and the right arm closer to each other. A biasing member, and the control system investigates a deviation of a center of the asymmetrical deformed cross-section ring with respect to the virtual straight line based on an inclination angle of the arms with respect to the virtual straight line in a machining process, and the deviation occurs. If the Individually controlling the rotational speed of the over edge roll and the lower edge roll is characterized by.

  In this configuration, a guide roll is provided to prevent the asymmetric irregular cross-section ring from shifting from a preferred position during the machining process, and the deviation of the asymmetric irregular cross-section ring is examined based on the inclination angle of the arm of the guide roll. Thus, correction is made according to the deviation.

  Thereby, it becomes possible to perform the forge shaping of the asymmetric irregular cross-section ring in a relatively simple form more accurately.

  Although the ring rolling mill according to the present invention has a relatively simple configuration, it becomes possible to accurately forge and shape an asymmetrical irregular cross-section ring.

1 is a side view schematically showing the configuration of an embodiment of a ring rolling mill according to the present invention. It is a top view which shows typically the principal part of the ring rolling mill of FIG. It is a perspective view which shows typically the principal part of the ring rolling mill of FIG. It is a perspective view which shows the state of the process initial stage by the ring rolling mill of FIG. It is a perspective view which shows the state at the time of the completion | finish of a process by the ring rolling mill of FIG. It is sectional drawing which shows the rough ground state before a process of the asymmetric irregular cross-section ring as a process target, and the launch state after a process by contrast. FIG. 2 is a partial side view showing a contact state of an asymmetrically deformed cross-section ring as a processing target with respect to a main drive roll in an initial stage of processing by the ring rolling mill of FIG. 1. FIG. 8 is a partial side view showing a contact state of an asymmetrically deformed cross-section ring as a processing target with respect to a main drive roll in a middle stage of processing following FIG. 7. FIG. 9 is a partial side view showing a contact state of an asymmetrically deformed cross-section ring as a processing target with respect to a main drive roll at a processing end stage following FIG. 8. It is a partial top view which shows a mode when the asymmetrical irregular cross-section ring as a process target shifts | deviates to the left side of a virtual straight line in the process of the process by the ring rolling mill of FIG. It is a partial top view which shows a mode when the asymmetrical irregular cross-section ring as a process target shifts | deviates to the right side of a virtual straight line in the process of the process by the ring rolling mill of FIG. It is a side view which shows other embodiment of the main drive roll of the ring rolling mill which concerns on this invention. It is a figure which shows typically the structure of the ring rolling mill which concerns on a prior art example.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  1 to 11 show an embodiment of the present invention. In the figure, 1 indicates the entire ring rolling mill.

  The ring rolling mill 1 forges and shapes an asymmetrical irregular cross-section ring 50 to be processed, and mainly includes a main drive roll 2, a mandrel 3, an upper edge roll 4, a lower edge roll 5, a left guide roll 6, a right A guide roll 7, first to sixth driving devices 21 to 26, a control device 30, and the like are provided.

  As shown in the left side of FIGS. 4 and 6, the asymmetrical irregular cross-section ring 50 in a wasteland state to be processed is provided with a flange portion 52 that projects radially outward at one axial end side of a cylindrical boss portion 51. In addition, an inclined portion 53 whose outer diameter gradually increases from the boss portion 51 toward the flange portion 52 is provided.

  The main drive roll 2 is mounted on the pair of left and right base frames 11 so as not to slide relative to each other so that the central axis 101 thereof is in the vertical direction. The outer peripheral surface of the cross-sectional ring 50 is brought into contact.

  The main drive roll 2 is rotationally driven by the first drive device 21. Although not shown, the first drive device 21 includes, for example, an appropriate motor and a speed reducer.

  And as shown in FIG. 1, the main drive roll 2 is provided with the circumferential groove 2a in the axial direction intermediate area of the outer peripheral surface. The circumferential groove 2a is a part into which the flange portion 52 of the asymmetrically modified cross-section ring 50 is fitted from the initial stage to the middle stage of processing, and at this time, the outer circumferential surface of the flange portion 52 abuts on the bottom surface of the circumferential groove 2a. It has become. The upper inner wall surface and the lower inner wall surface of the circumferential groove 2a are inclined so as to gradually increase the distance between them in the radially outward direction. This inclination is provided as a draft when the flange portion 52 of the asymmetric irregular cross-section ring 50 is pulled out.

  A slope 2b is provided on the opening side of the upper inner wall surface (one inner wall surface) of the circumferential groove 2a. This inclined surface 2b comes into contact with the inclined portion 53 as the amount of material flow from the flange portion 52 to the inclined portion 53 of the asymmetric deformed cross-section ring 50 increases with the progress of processing. A cylindrical surface 2c is provided in the small diameter region on the outer peripheral surface of the inclined surface 2b.

  The mandrel 3 is attached to the first moving frame 12 in a state in which the central axis 102 is vertically slidable and in a state in which the mandrel 3 cannot slide relative to the first moving frame 12. The mandrel 3 is driven up and down along the direction of the central axis 102 (vertical direction) by the second driving device 22 and is inserted into the central hole of the asymmetrical deformed cross-section ring 50 as necessary. It is designed to be extracted.

  The first moving frame 12 is mounted on the base frame 11 so as to be relatively slidable along the longitudinal direction thereof. That is, the first moving frame 12 is slid by the third driving device 23 so that the mandrel 3 is linearly slid so as to approach or separate from the main drive roll 2 in a direction along the virtual straight line 300 described below. become. The second and third driving devices 22 and 23 are, for example, hydraulic cylinders although not shown.

  The first moving frame 12 is integrally mounted with a mounting base 13 on which an asymmetrical irregular cross-section ring 50 as a processing target is mounted. That is, the mounting base 13 is slid together with the first moving frame 12.

  The upper edge roll 4 and the lower edge roll 5 are both formed in a conical shape, and are also called axial rolls.

  The upper edge roll 4 is configured such that its conical outer peripheral surface comes into contact with the small end face 54 on the upper end side in the axial direction of the asymmetric irregular cross-section ring 50. On the other hand, the lower edge roll 5 is configured such that its conical outer peripheral surface comes into contact with the large end surface 55 on the lower end side in the axial direction of the asymmetric irregular cross-section ring 50.

  The upper edge roll 4 and the lower edge roll 5 are inclined in a side view with respect to an imaginary straight line 300 whose central axes 103 and 104 pass through the center 201 of the main drive roll 2 and the center 202 of the mandrel 3 (FIG. 1). And a posture (see FIG. 2) that coincides with each other in plan view, and is disposed 180 degrees opposite to the main drive roll 2 with the mandrel 3 as the center.

  The upper edge roll 4 and the lower edge roll 5 are individually rotationally driven by the fourth and fifth driving devices 24 and 25. The fourth and fifth driving devices 24 and 25 include, for example, appropriate motors and reduction gears, although not shown.

  Further, the upper edge roll 4 and the lower edge roll 5 are mounted on the second moving frame 14 so as to be individually rotatable. The second moving frame 14 is mounted so as to be slidable relative to the base frame 11 along the longitudinal direction thereof.

  That is, the second moving frame 14 is slid by the sixth driving device 26 so that the upper edge roll 4 and the lower edge roll 5 are linearly moved toward or away from the mandrel 3 in the direction along the virtual straight line 300 described below. Can be slid. Although not shown, the sixth drive device 26 is, for example, a hydraulic cylinder.

  The left guide roll 6 and the right guide roll 7 are attached to the front end sides of the left arm 6a and the right arm 7a in a state in which the left guide roll 6 and the right guide roll 7 are relatively non-slidable and idle. The left guide roll 6 and the right guide roll 7 are also called backup rolls.

  The proximal end sides of the left arm 6a and the right arm 7a are respectively attached to the base frame 11 so as to be able to turn in the horizontal direction. Each is elastically biased so as to be pressed. Although not shown in detail, the urging member 8 is, for example, a spring or a hydraulic damper.

  The left guide roll 6 and the right guide roll 7 are arranged on the left and right sides of the virtual straight line 300 in a plan view so as to be displaceable from each other with respect to the virtual straight line 300, and the left arm 6 a and the right arm 7 a with respect to the virtual straight line 300 are arranged. Each inclination angle is individually detected by the first and second angle sensors 27 and 28.

  The operations of the first to sixth drive devices 21 to 26 are individually controlled by the control device 30. In the program memory (not shown) of the control device 30, the operations of the first to sixth drive devices 21 to 26 are appropriately controlled in accordance with the size of each part of the outer shape of the asymmetric deformed cross-section ring 50 and forging shaping (launching) conditions. The program to do is stored. That is, the first to sixth driving devices 21 to 26 and the control device 30 correspond to the control system described in the claims.

  Specifically, as an example of the program executed by the control device 30, a process of lowering the mandrel 3 so as to be inserted into the center hole of the asymmetric deformed cross-section ring 50 mounted on the mounting base 13, a main drive roll 2 for rotating the roller 2 at a constant speed, a process for sliding the mandrel 3 at a constant speed so as to approach the main drive roll 2 side, and an upper edge in the axial direction of the asymmetric deformed cross-section ring 50 for the upper edge roll 4 and the lower edge roll 5. And the upper edge roll 4 and the lower edge roll based on the data table (or map) stored in the program memory, and the sliding process so as to contact the small end face 54 on the side and the large end face 55 on the lower end side in the axial direction. 5 is a process for variably controlling the rotational speed of the individual, and the asymmetrical profile ring 50 There is a program for executing the outer diameter with the progress of processing and processing for ending the processing when it reaches the target value appropriately.

  It should be noted that the data table is prepared in advance by measuring the initial (rough ground state) dimensions (inner diameter, outer diameter of the flange portion 52, outer diameter of the axial center position 400 of the boss portion 51, axial width, etc.) of the asymmetrical irregular cross-section ring 50. ) And the dimensions (inner diameter, outer diameter of the flange portion 52, outer diameter of the axial center position 400 of the boss portion 51, axial width, etc.) of the target (launched state) in the asymmetric deformed cross-section ring 50 In addition, in the process of rotating the main drive roll 2 at a constant speed to process the asymmetric deformed cross-section ring 50, the change in the outer diameter of the axial intermediate position 400 with the passage of time from the initial stage of the process to the end of the process is measured. At the same time, a change in the peripheral speed of the axial intermediate position 400 is calculated, and the change is made appropriately based on the measurement result and the calculation result.

  In other words, this data table shows the correlation between the passage of time from the start of machining to the end of machining and the change in the peripheral speed of the intermediate position 400 in the axial direction of the boss 51 in the asymmetric deformed cross-section ring 50 during the machining process. Thus, data for extracting the rotational speeds of the upper edge roll 4 and the lower edge roll 5 corresponding to the change in the peripheral speed of the axial intermediate position 400 from the start to the end of the process is written.

  Further, as another example of the program executed by the control device 30, the inclination angle θ 1 of both arms 6 a and 7 a with respect to the virtual straight line 300 based on the outputs of the first and second angle sensors 27 and 28 in the machining process. Based on θ2, the presence / absence of the deviation 203 and the deviation amount ΔX of the center 203 of the asymmetric irregular cross-section ring 50 with respect to the virtual straight line 300 are checked, and the upper edge roll 4 and the lower edge roll so as to correct the deviation when the deviation occurs. There is also a program for individually controlling the rotation speed 5 by the fourth and fifth drive units 24 and 25.

  The operation of the ring rolling mill 1 having such a configuration will be described.

  As an outline, a predetermined region on the circumference of the asymmetric deformed cross-section ring 50 (see the left side of FIG. 6) in a wasteland state heated to a high temperature between the main drive roll 2 and the mandrel 3 is sandwiched from inside and outside in the radial direction, The main drive roll 2 is driven to rotate while the main drive roll 2 is rotated in a state in which the predetermined area 180 degrees opposite to the predetermined area in the asymmetric deformed cross-section ring 50 is sandwiched from both axial sides by the upper edge roll 4 and the lower edge roll 5. The inner and outer diameters R1 and R2 are enlarged while the radial dimension (thickness) H of the asymmetrically deformed cross-section ring 50 is reduced by sliding the roll 2 so as to gradually approach the roll 2, and the axial dimension W is adjusted. The asymmetric profile ring 50 (see the right side of FIG. 6) in the launched state is obtained.

  Specifically, first, the asymmetric deformed cross-section ring 50 heated to a high temperature is disposed on the mounting table 13, and the mandrel 3 is lowered by the second drive device 22 to be inserted into the central hole of the asymmetric deformed cross-section ring 50.

  Thereafter, the first drive device 21 rotates the main drive roll 2 at a constant speed, and the third drive device 23 slides the mandrel 3 toward the main drive roll 2 so that the asymmetrically deformed cross-section ring 50 is on the circumference. Is brought into contact with the outer peripheral surface of the main drive roll 2.

  At the same time, the upper edge roll 4 and the lower edge roll 5 are slid by the sixth driving device 26 so as to approach the asymmetric irregular cross-section ring 50, so that the small end face 54 and the axial direction on the axial upper end side of the asymmetric irregular cross-section ring 50 The conical outer peripheral surfaces of the upper edge roll 4 and the lower edge roll 5 are brought into contact with the large end face 55 on the lower end side, and the upper edge roll 4 and the lower edge roll 5 are individually provided by the fourth and fifth driving devices 24 and 25. To rotate.

  In this way, the radial dimension (thickness) H of the asymmetric deformed cross-section ring 50 is thinly rolled by sliding the mandrel 3 so as to gradually approach the main drive roll 2 side by the third driving device 23. While increasing the inner and outer diameter dimensions R1, R2, the axial dimension W is adjusted.

  Thus, the radial dimension (thickness) H and the inner and outer diameter dimensions of the asymmetric deformed cross-section ring 50 based on a detection signal from a non-contact type measurement sensor (for example, a laser type length measurement sensor) (not shown). When it is detected that R1 and R2 have reached a predetermined target value, the processing is terminated.

  At the end of this processing, the slide of the mandrel 3 and the rotation of the main drive roll 2 are stopped, and the upper edge roll 4 and the lower edge roll 5 are slid away from the asymmetric deformed cross-section ring 50 by the sixth driving device 26. A process of raising the mandrel 3 in the direction of extracting it from the center hole of the asymmetrically deformed cross-section ring 50 by the second driving device 22 is appropriately executed.

  In such a processing form, from the initial stage to the middle stage, as shown in FIG. 7, the flange portion 52 of the asymmetric deformed cross-section ring 50 is fitted into the circumferential groove 2 a of the main drive roll 2, and the flange portion 52 The outer peripheral surface comes into contact with the bottom surface of the circumferential groove 2a.

  As the processing proceeds, the amount of material flow from the flange portion 52 to the inclined portion 53 of the asymmetric deformed cross-section ring 50 increases, whereby the inclined portion 53 of the asymmetric deformed cross-section ring 50 is plastically deformed. As shown in FIG. 8, the contact with the inclined surface 2b of the circumferential groove 2a is transferred to the inclined surface 2b so that the shape of the inclined portion 53 of the asymmetric deformed cross-section ring 50 follows.

  Further, at the end of the processing, as shown in FIG. 9, the outer peripheral surface of the flange portion 52 starts from the bottom surface of the circumferential groove 2a as the material flows further from the flange portion 52 to the inclined portion 53 of the asymmetric irregular cross-section ring 50. In addition to being separated (also referred to as “sink” of the material), the small-diameter end side region on the outer peripheral surface of the boss portion 51 is formed on the cylindrical surface 56 so as to follow the cylindrical surface 2 c of the main drive roll 2.

  In the processing mode by the ring rolling mill 1 of this embodiment, the peripheral speed and the inclination of the outer peripheral surface of the flange portion 52 of the asymmetrically deformed cross-section ring 50 are changed by changing the outer peripheral shape of the asymmetrically deformed cross-section ring 50 one by one in the processing process. There will be a large difference between the circumferential speed at each position in the axial direction of the outer circumferential surface of the portion 53.

  Considering this point, in this embodiment, the period in which the outer peripheral surface of the flange portion 52 and the outer peripheral surface of the inclined portion 53 of the asymmetric deformed cross-section ring 50 simultaneously contact the outer peripheral surface of the main drive roll 2 is shortened as much as possible. I try to let them. As a result, the occurrence of slipping in a wide area between the main drive roll 2 and the asymmetrical profile cross-section ring 50 is suppressed or prevented.

  In addition, the upper edge roll 4 and the lower edge roll 5 are not driven bodies but are driven bodies, and their rotational speeds are based on the peripheral speed at the axial center position 400 of the boss portion 51 of the asymmetric deformed cross-section ring 50. It is controlled individually. As a result, although the peripheral speed at the axial center position 400 of the boss portion 51 changes one by one with the progress of processing of the asymmetric irregular cross-section ring 50, the upper edge roll 4 and the lower edge roll 5 are different from the asymmetric irregular cross-section ring 50. The occurrence of slipping at the contact portion is suppressed or prevented.

  These synergistic actions can suppress or prevent the rotational fluctuation of the asymmetric deformed cross-section ring 50 in the machining process as much as possible. Therefore, the center 203 of the asymmetric deformed cross-section ring 50 rotating in the machining process becomes the virtual straight line 300. It becomes difficult to move to the left and right of the. As a result, since the behavior of the asymmetric irregular cross-section ring 50 becomes stable during the machining process, the forging and shaping of the asymmetric irregular cross-section ring 50 can be performed accurately.

  Furthermore, if the center 203 of the asymmetric deformed cross-section ring 50 is shifted to the right side (see FIG. 10) or the left side (see FIG. 11) of the imaginary straight line 300 in plan view, the occurrence and amount of this shift are assumed. ΔX is detected by the control device 30 based on the outputs of the first and second angle sensors 27 and 28, and the rotational speed of the upper edge roll 4 and the rotational speed of the lower edge roll 5 are corrected so as to correct the detected deviation. Thus, the center 203 of the asymmetric deformed cross-section ring 50 is controlled so as to return to the virtual straight line 300. In FIGS. 10 and 11, the shift amount ΔX is exaggerated.

  Incidentally, assuming that the rotational direction of the asymmetric deformed cross-section ring 50 is counterclockwise (in the direction of the arrow in FIG. 4) in plan view, when the rotational speed of the upper edge roll 4 is higher than the rotational speed of the lower edge roll 5, While the center 203 of the asymmetric deformed cross-section ring 50 is displaced to the right side of the virtual straight line 300 in FIG. 2, for example, when the rotational speed of the upper edge roll 4 is made slower than the rotational speed of the lower edge roll 5, The center 203 of the asymmetric profile cross-section ring 50 is displaced to the left side of the virtual straight line 300 in FIG.

  As described above, in the embodiment to which the present invention is applied, only the outer shape of the main drive roll 2 is made to correspond to the shape to be forged and shaped of the asymmetric irregular cross-section ring 50, and is shown in FIG. 13. Since the left and right main drive rolls 62 and 63 are not used as in the conventional example, the ring rolling mill 1 is made to have a relatively simple configuration, and the forging and shaping of the asymmetric deformed cross-section ring 50 is accurately performed while suppressing an increase in manufacturing cost. It becomes possible to do.

  In particular, in this embodiment, the upper edge roll 4 and the lower edge roll 5 are not driven bodies as in the prior art, but are used as driving bodies, and the rotational speed control mode of the upper edge roll 4 and the lower edge roll 5 is as follows. Since, for example, the peripheral speed of the axial intermediate position 400 is detected in real time in the machining process, the control is performed based on the previously created data table without using the control based on the detection result. The control mode of the rotational speed of the edge roll 4 and the lower edge roll 5 can be relatively simplified.

  Further, in this embodiment, when the center 203 is shifted in the left-right direction in the process of processing the asymmetric deformed cross-section ring 50, the rotational driving force of the upper edge roll 4 and the lower edge roll 5 is simply controlled individually. Since the deviation is corrected, it is advantageous in performing forging and shaping of the asymmetric irregular cross-section ring 50 in a relatively simple form.

  In addition, this invention is not limited only to the said embodiment, It can change suitably in the range equivalent to the claim and the said range.

  (1) FIG. 12 shows another example of the outer shape of the main drive roll 2. In the main drive roll 2, a stepped portion 2d is provided on the outer diameter side of the slope 2b. The stepped portion 2d is provided in order to regulate the range of the material that flows from the flange portion 52 to the inclined portion 53 of the asymmetric deformed cross-section ring 50 during the machining process.

  (2) In the above embodiment, the case where the mandrel 3 is slid is taken as an example. However, the present invention is not limited to this, and although not illustrated, the main drive roll 2 is slid. It is also possible to do.

  (3) In the above embodiment, the case where the rotational speed control of the upper edge roll 4 and the lower edge roll 5 is performed based on a data table (map) created in advance is taken as an example, but the present invention is limited to this. Is not to be done.

  In the present invention, for example, in the process of processing the asymmetric deformed cross-section ring 50 by rotating the main drive roll 2 at a constant speed, a change with the passage of time of the peripheral speed of the axial intermediate position 400 from the initial processing to the end of processing is performed. While detecting in real time, you may make it control individually the rotational speed of the upper edge roll 4 and the lower edge roll 5 according to the detection result.

  According to the present invention, a predetermined region on the circumference of an asymmetrically deformed cross-section ring as a processing object is sandwiched between a main drive roll and a mandrel whose center axis is along the vertical direction from the inside and outside in the radial direction, and the asymmetrically shaped cross-section ring In which the predetermined region opposite to the predetermined region by 180 degrees is sandwiched from both sides in the axial direction by a conical upper edge roll and a lower edge roll, and the main drive roll or the A ring rolling mill that expands the inner and outer diameters while adjusting the axial dimension while thinning the radial thickness of the asymmetric deformed cross-section ring by sliding at least one of the mandrels gradually closer to the other side. It is possible to use suitably.

1 Ring rolling mill
2 Main drive roll
2a Circumferential groove of main drive roll
2b Slope of main drive roll
3 Mandrels
4 Upper edge roll
5 Lower edge roll
6 Left guide roll
6a Left arm
7 Light guide roll
7a Light arm
8 urging member 21 first driving device 22 second driving device 23 third driving device 24 fourth driving device 25 fifth driving device 26 sixth driving device 27 first angle sensor 28 second angle sensor 30 control device 50 asymmetrical variant Cross-section ring 51 Boss portion of asymmetrical irregular cross-section ring 52 Flange portion of asymmetrical irregular cross-section ring 53 Inclined portion of asymmetrical irregular cross-section ring 101 Central axis of main drive roll 2 102 Central axis of mandrel 3 103 Central axis of upper edge roll 4 104 Lower Center axis of edge roll 5 201 Center of main drive roll 2 202 Center of mandrel 3 203 Center of asymmetric irregular cross section ring 50 300 Virtual straight line 400 Axial center position of boss 51

Claims (3)

Forging and shaping an asymmetrically deformed cross-section ring with a flange portion projecting radially outward at one axial end of a cylindrical boss portion and an inclined portion with an outer diameter gradually increasing from the boss portion toward the flange portion A ring rolling mill for
A main drive roll whose central axis is in a posture along the vertical direction, and one place on the circumference of the outer peripheral surface of the asymmetrically deformed cross-section ring is in contact;
A mandrel for pressing the outer peripheral surface of the asymmetrically deformed cross-section ring against the main drive roll in a state where the center axis is in a posture along the vertical direction and is inserted through the central hole of the asymmetrically deformed cross-section ring;
Each of the central axes is inclined in a side view with respect to an imaginary straight line passing through the center of the main drive roll and the center of the mandrel, and is in a position that matches in a plan view, and the main axis about the mandrel. A conical upper edge roll and a lower edge roll which are in contact with a small end face on the upper end side in the axial direction and a large end face on the lower end side in the axial direction of the asymmetrically modified cross-section ring in a state of being arranged 180 degrees opposite to the drive roll; ,
The main drive roll, the upper edge roll and the lower edge roll are individually rotated and driven, and the mandrel, the upper edge roll and the lower edge roll are individually slid, and a control system is provided.
A circumferential groove having a bottom surface on which the flange portion of the asymmetrically deformed cross-section ring is fitted and can be brought into contact with the outer circumferential surface of the main drive roll from an initial stage to an intermediate stage of machining. And the flow rate of the material from the flange portion of the asymmetrically deformed cross-section ring to the inclined portion increases with the progress of the processing on the opening side of one inner wall surface of the circumferential groove. Is provided with a slope,
The control system slides the mandrel to bring the outer peripheral surface of the flange portion of the asymmetrically deformed cross-section ring into contact with the bottom surface of the peripheral groove of the main drive roll, and the upper edge roll and the lower edge roll. The main drive roll is driven to rotate at a constant speed while being brought into contact with the small end face on the upper end side in the axial direction and the large end face on the lower end side in the axial direction by sliding. The ring rolling mill characterized in that the rotational speeds of the upper edge roll and the lower edge roll are individually controlled on the basis of the circumferential speed at the axially central position of the boss portion of the asymmetric deformed cross-section ring. The ring rolling mill according to claim 1,
The control system includes a program memory for storing a data table for individually and variably controlling the rotation speed of the upper edge roll and the lower edge roll,
The data table includes at least an initial outer diameter at an axial center position of the boss portion in the asymmetric deformed cross-section ring and a target outer diameter at an axial center position of the boss portion at the end of processing of the asymmetric deformed cross-section ring. A predetermined change in the circumferential speed of the axial intermediate position from the beginning of machining to the end of machining in the process of machining the asymmetric deformed cross-section ring by rotating the main drive roll at a constant speed. A ring rolling mill characterized in that it is created based on the results of inspection. The ring rolling mill according to claim 1 or 2,
A left guide roll and a right guide roll that are pressed against the left and right symmetrical positions of the semicircular region near the main drive roll on the outer peripheral surface of the asymmetric deformed cross-section ring,
A left arm and a right arm on which the left guide roll and the right guide roll are individually supported on the front end side and the base end side is supported so as to be turnable on both sides of the virtual straight line;
A biasing member that resiliently biases the left arm and the right arm toward each other;
The control system investigates a deviation of the center of the asymmetrical irregular cross-section ring with respect to the virtual straight line based on an inclination angle of the arms with respect to the virtual straight line in a machining process, and corrects the deviation when the deviation occurs. The ring rolling mill is characterized in that the rotational speeds of the upper edge roll and the lower edge roll are individually controlled.

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