JP4535043B2 - Rolling equipment - Google Patents

Description

  The present invention relates to a rolling device that suppresses error fluctuations due to thermal expansion of a ball screw shaft.

  Conventionally, a pair of rolling dies having a cutting tool are arranged vertically symmetrically, a pair of ball screw shafts are driven by a drive motor, and the rolling dies slidably held on the respective ball screw shafts are caused to move in parallel with each other, 2. Description of the Related Art A rolling device is known in which a workpiece is plastically deformed while rolling between both rolling dies and the workpiece is rolled into a shape that meshes with the rolling die. Here, the ball screw shaft is generally held on the upper side to which the drive motor is attached so as not to move in the axial direction.

  Generally, a ball screw shaft undergoes thermal expansion due to the effects of temperature rise such as sliding frictional heat generated during processing, heat generation of a motor, and outside air temperature. In a conventional rolling device, a pair of ball screw shafts are held so that the upper side to which the drive motor is attached does not move in the axial direction, and the rolling dies are arranged symmetrically on the pair of ball screw shafts. Each rolling die moves by passing each other.

  The direction of thermal expansion of the ball screw shaft is from the upper side held so as not to move in the axial direction to the lower side. Therefore, for one rolling die that moves from top to bottom, the expansion direction due to thermal expansion of the ball screw shaft is closer to the workpiece to be rolled, and conversely, the other rolling die that moves from bottom to top Therefore, the expansion direction by the thermal expansion of the ball screw shaft is a direction away from the workpiece.

  Therefore, due to the thermal expansion of the ball screw shaft, the distance to the workpiece is shortened for one rolling die that moves from top to bottom, and the distance to the workpiece is long for the other rolling die that moves from bottom to top. Become. The difference between these distances increases with the thermal expansion of the ball screw shaft.

  As the difference in the distance from each rolling die to the workpiece increases, the pitch error of the rolling cutter fluctuates, resulting in a defective product exceeding the allowable accuracy. Therefore, there has been a demand for a rolling device that does not have defective products even when the ball screw shaft is thermally expanded.

  The present invention has been made in view of such circumstances, and provides a rolling device capable of accurately processing by suppressing fluctuation and increase in pitch error of a rolling blade even when a ball screw shaft is thermally expanded. The purpose is to do.

  Therefore, as a result of researches to solve this problem, the present inventor has found that the difference in thermal expansion displacement between the pair of ball screw shafts can be reduced by canceling out the thermal expansion of the pair of ball screw shafts, so that accurate machining can be performed. The present invention has been completed.

That is, the rolling device according to the present invention includes a main body having a pair of upper and lower opposing frames facing each other at a predetermined interval, and a pair of the opposing frames, the end portions of which are rotatable with respect to each other. A first ball screw shaft and a second ball screw shaft that are held in parallel, and a first rolling blade that is slidably held by the first ball screw shaft and moves in the axial direction to roll the workpiece. A second holding base and a second ball screw shaft that is slidably held by the second ball screw shaft and that moves in the axial direction and in the opposite direction to the first holding base in synchronization with the first holding base. a second holder for holding the rolling blade, driving means for synchronously rotating said first ball screw shaft及beauty before Symbol second ball screw shaft, the rolling device consisting of an upper side of the said first ball screw shaft The end part of the upper part is opposed to the upper opposite frame so as not to rotate in the axial direction. The lower end portion of the first ball screw shaft is rotatably held in an axially movable manner on the lower opposing frame, and the upper end portion of the second ball screw shaft is the upper portion. The lower end side of the second ball screw shaft is rotatably held in the lower side opposite frame so as to be axially immovable. And

  By adopting such a configuration, the end portion of the first ball screw shaft is held in the axial direction stationary and the end portion of the second ball screw shaft is held in the axial direction movable in the upper facing frame. Further, the opposite lower side opposing frame holds the end portion of the first ball screw shaft so as to be movable in the axial direction and the end portion of the second ball screw shaft so as not to move in the axial direction. For this reason, the holding positions of the ball screw shafts that do not move in the axial direction with respect to the opposing frame are opposed to each other.

  The direction of thermal expansion of each ball screw shaft is directed from the end portion held in the axial direction immovable to the end portion held axially movable so that the direction of thermal expansion of each ball screw shaft is the opposite direction. Become. Since the direction of thermal expansion of each ball screw shaft is the opposite direction, the displacement of the position due to the thermal expansion of each rolling blade with the workpiece is also the opposite direction. Since each rolling blade rolls the workpiece by relative movement, even if there is a relative displacement due to thermal expansion, the displacement direction of each rolling blade due to the thermal expansion displacement is the same as the moving direction of each rolling blade. The same or both are in opposite directions, so that the difference in distance between the workpiece and each rolling blade does not change significantly.

  Thus, even if there is thermal expansion of the ball screw shaft, the difference in distance between the workpiece and each rolling blade does not change greatly, and a rolling device with good rolling accuracy can be provided.

  The end portions of the first ball screw shaft and the second ball screw shaft that are rotatably held in the axial direction can be configured to be held via bearings and axial locking means.

  Through the bearings, the end portions of the first ball screw shaft and the second ball screw shaft can receive a load in a certain direction in the axial direction in addition to the load in the rotational direction of the shaft. Furthermore, the end of each ball screw shaft is held immovably in the axial direction by holding the end through the axial locking means.

  By adopting the above configuration, the rigidity of holding the end portion on the side immovable in the axial direction is improved.

  The drive means includes a drive motor installed on the opposed frame, a drive gear fitted to a motor shaft of the drive motor, a first driven gear and a second driven gear meshed with the drive gear, The drive gear, the first driven gear, and the second driven gear for synchronous rotation of the drive gear, the first driven gear, and the second driven gear without shifting the synchronous rotational positions of the drive gear, the first driven gear, and the second driven gear. It is possible to adopt a configuration in which the motor shaft of the drive motor can be attached to and detached from the drive gear.

  Since the motor shaft can be attached / detached without shifting the synchronous rotation position of each gear from the drive gear, the position of the gear for synchronously rotating the drive gear, the first driven gear, and the second driven gear when the drive motor is attached / detached. There is no deviation. Since the drive gear, the first driven gear, and the second driven gear do not deviate from the synchronous rotation position where the drive gear is disposed, the ball screw shaft is also not displaced from the synchronous rotation position where it is disposed, and the original assembly is accurately performed when the drive motor is reassembled. Can be restored.

  According to the rolling device of the present invention, even if the position of the cutting tool is moved by the thermal expansion of the ball screw shaft, the difference in distance from each rolling blade to the processing center is not increased, and rolling can be performed with high accuracy.

  An embodiment of a rolling device of the present invention will be described with reference to the drawings.

  FIG. 1 shows a schematic view of an embodiment of the rolling device of the present invention. FIG. 2 is an enlarged view of a portion surrounded by A in the rolling apparatus of FIG.

  As shown in FIG. 1, a main body 100 of a rolling device according to an embodiment of the present invention includes an upper frame 101 and a lower frame 102 which are a pair of opposed frames facing each other with a predetermined interval. The main body 100 has a box shape, and the upper frame 101 and the lower frame 102 are arranged to face each other in the vertical direction of the main body.

  The upper frame 101 has an opening, and an upper support member 110 is attached to the upper surface of the upper frame 101 by a bolt, with the lower part partially fitted into the opening and the upper part opened. The upper support member 110 forms a casing having a space inside together with the top plate 120 attached as a lid to the open surface of the upper support member 110. On the top surface of the top plate 120, a drive motor 10 that is a drive means of a ball screw shaft is installed. The top plate 120 is formed with a hole through which the lower portion of the drive motor 10 can be inserted. The drive motor 10 is inserted through the top plate 120 and the lower portion is disposed in the housing.

  A set of a first ball screw shaft 21 and a second ball screw shaft 22 are held in parallel with each other on the upper frame 101 and the lower frame 102. The first ball screw shaft 21 and the second ball screw shaft 22 have the same diameter. An end of the first ball screw shaft 21 is held in the upper frame 101 so as not to move in the axial direction, and an end of the second ball screw shaft 22 is held so as to be movable in the axial direction. In the lower frame 102, the end of the first ball screw shaft 21 is held axially movable, and the end of the second ball screw shaft 22 is held immovably in the axial direction.

  The holding of the end of each ball screw shaft will be described with reference to FIG. FIG. 2 is an enlarged view of a portion surrounded by A in FIG. 1 and shows the end side of each ball screw shaft on the upper frame 101 side.

  As shown in FIGS. 1 and 2, the upper frame 101 and the upper support member 110 attached to the upper surface of the upper frame 101 are integrally fixed with bolts. Although the upper frame 101 is not shown in FIG. 2, the upper support member 110 is attached to the upper surface of the upper frame 101 as in FIG. 1.

  The upper support member 110 is formed with holes through which the ball screw shafts and the drive gear 11 can be inserted in the lower surface, and the side wall rises vertically from the lower surface so as to cover the shaft end and the drive motor shaft to form a housing. Yes. A top plate 120 is attached to the upper end surface of the side wall, and in addition to the holes formed in the top plate 120, a casing having holes on the lower surface side is also formed.

  The motor shaft of the drive motor 10 is fitted with the drive gear 11. The drive gear 11 is fastened so as to rotate integrally with the motor shaft of the drive motor 10 via a key material, and rotates integrally with the drive motor 10. The drive gear 11 meshes with the first driven gear 51 and the second driven gear 52, and the rotation of the drive gear 11 is transmitted to each driven gear. The first ball screw shaft 21 is fastened via a key material so as to rotate integrally with the first driven gear 51. Therefore, the first driven gear 51 and the first ball screw shaft 21 rotate integrally with the rotation of the drive motor 10. Similarly, the second ball screw shaft 22 is fastened via a key material so as to rotate integrally with the second driven gear 52, and the second driven gear 52 and the second ball screw shaft 22 are synchronized with the rotation of the drive motor 10. Rotates together.

  The first ball screw shaft 21, the first driven gear 51 fastened to the first ball screw shaft 21, the second ball screw shaft 22, and the second ball screw shaft 22 are fastened to the holes on the lower surface of the upper support member 110. The driven gear 52 and the drive gear 11 fastened to the motor shaft are inserted.

  The motor shaft of the drive motor 10 is fitted inside the drive gear 11. The motor shaft has a tapered side surface and is fastened to rotate integrally with the inner side surface of the drive gear 11 via a crescent-shaped key material (not shown). A screw 709 is screwed to the tip of the motor shaft. The tip of the motor shaft to which the screw 709 is screwed is fitted into a cylindrical portion of an extension bolt 706 having a shape in which a large diameter cylinder and a small diameter column are continuous.

  The extension bolt 706 is fitted inside the drive gear 11 and rotates integrally with the motor shaft and the drive gear 11. In the extension bolt 706, the tip of the cylindrical portion is inserted through the lowermost hole of the drive gear 11 and protrudes to the outside of the drive gear 11. Two nuts 707 are screwed into the protruding cylindrical portion following the collar 708. By tightening the nut 707, the extension bolt 706 is pulled, and the extension bolt 706, the motor shaft, and the drive gear 11 are integrated. Conclude.

  The drive gear 11 has a cylindrical shape divided into five stages. The diameters of the five stages are different from each other, the diameter of the second cylinder from the top is the largest, and the diameter after the third stage is gradually reduced. The side surface of the diameter of the second cylinder from the top is a gear, and the drive gear 11 is engaged with the first driven gear 51 and the second driven gear 52 by the gear on this side surface.

  The side surfaces of the fourth and fifth cylinders from the top of the drive gear 11 are in contact with bearings 63 fixed to the inner wall of the hole of the upper support member 110. The number of bearings 63 is two in FIG. 2, but the number of bearings is not particularly limited. The drive motor 10, the drive gear 11, the extension bolt 706, the collar 708, and the nut 707 that are integrally fastened via the bearing 63 are held by the upper support member 110.

  Further, when the drive motor 10 is replaced, the nut 707 is loosened and the extension bolt 706 is pushed upward to be detached from the drive gear 11 and removed upward. Since the drive gear 11 is held by the upper support member 110 via the bearing 63, the drive motor 10 can be replaced without disengaging the gears of the drive gear 11, the first driven gear 51, and the second driven gear 52. You can Therefore, the drive motor 10 can be replaced without moving the synchronous rotation positions of the first ball screw shaft 21 fastened to the first driven gear 51 and the second ball screw shaft 22 fastened to the second driven gear 52. When the drive motor 10 is reassembled, the original assembled state can be restored with high accuracy.

  The first driven gear 51 and the second driven gear 52 have cylindrical shapes with different diameters at the upper, middle, and lower stages. In the upper stage of the first driven gear 51 and the second driven gear 52, the surface of the upper cylindrical shape is a gear, and each ball screw shaft is inserted therein. The gears of the drive gear 11 are engaged with the outer side surfaces of the upper gears of the gears.

  The middle stage of the first driven gear 51 and the second driven gear 52 has a cylindrical shape having an outer diameter smaller than that of the upper cylindrical shape and a larger outer diameter than that of the lower cylindrical shape, and a ball screw shaft is inserted therein. The boundary between the middle cylinder shape and the lower cylinder shape of the first driven gear 51 and the second driven gear 52 is a step. The first driven gear 51 will be described as an example. The collar 703 is attached to the step between the outer cylindrical shape and the lower cylindrical shape outside the first driven gear 51 so that the O-ring contacts the lower cylindrical shape. The collar 703 rotates integrally with the first driven gear 51. Similarly, a collar is attached to the second driven gear.

  The lower stage of the first driven gear 51 and the second driven gear 52 has a cylindrical shape having an outer diameter smaller than that of the middle stage, and each ball screw shaft is inserted through the inside.

  A bearing 61 is in contact with the outer side surface of the lower cylindrical shape of the first driven gear 51. A plurality of bearings 61 (four in this embodiment) are installed on the inner wall surface of the hole of the upper support member 110. The outer ring of the bearing 61 is fixed to the inner wall surface, and the inner ring of the bearing 61 is in contact with the lower cylindrical side surface of the first driven gear 51 to receive the axial load well.

  As shown in FIG. 2, a collar 704 is installed at the lower portion of the bearing 61 on the outer side surface of the lower cylindrical shape of the first driven gear 51, and the collar 704 rotates integrally with the first driven gear 51 like the collar 703. To do. The collar 703 and the collar 704 are in contact with the side surface of the inner ring of the bearing 61 at the collar side surface. The opposite side surface of the collar 703 is in contact with the step between the middle and lower stages of the first driven gear 51, and the opposite side surface of the collar 704 is in contact with a nut 705 attached to the lower portion of the collar 704.

  The nut 705 holds the collar 704 between the bearing 61. Since the outer ring of the bearing 61 is fixed to the upper support member 110, the bearing 61 does not move in the vertical direction. The first driven gear 51 is held by the upper support member 110 so as not to move in the vertical direction by being fastened to the bearing 61 by a collar 704 and a nut 705. The structure of the collar, the bearing, and the nut is the same in the second driven gear 52, and the second driven gear 52 is held by the upper support member 110 so as not to move in the vertical direction.

  In the present embodiment, four bearings 61 are used, but the number of bearings 61 is not limited to four. When the load is small, it may be two or three, and when the load is large, it may be five or more. The type of the bearing 61 is not particularly limited.

  The diameter of the first ball screw shaft 21 is increased from the end in four stages, and the place where each diameter changes is stepped. The end of the first ball screw shaft 21 has the smallest shaft diameter. A nut 701 is screwed to the end of the first ball screw shaft 21 having the smallest diameter, and the nut 701 is fastened and fixed via a flange 702 disposed on the upper surface of the first driven gear 51. The shaft 21 is held by the first driven gear 51 so as not to move in the axial direction. In this embodiment, the nut 701 and the flange 702 correspond to the axial locking means.

  In addition, the first ball screw shaft 21 has a diameter that is lower in the portion inserted through the portion corresponding to the upper and middle portions of the first driven gear 51 than in the first driven gear 51. The diameter of the lower part that has come out is further increased. On the first ball screw shaft 21, a step 81 is formed at a boundary portion between a portion inserted through the lower stage of the first driven gear 51 and a portion protruding from the first driven gear 51. The first ball screw shaft 51 is locked so as not to move upward when the step 81 abuts against the lower surface of the end of the first driven gear 51.

  Thus, the first ball screw shaft 21 is held by the first driven gear 51 so as not to move in the axial direction. As described above, the first driven gear 51 is held by the upper support member 110 so as not to move in the vertical direction. Since the upper support member 110 is fixed to the upper frame 101, the first ball screw shaft 21 also does not move in the axial direction. Is held by the upper frame 101.

  Next, the end side of the second ball screw shaft 22 will be described. None of the end portions of the second ball screw shaft 22 corresponds to the outermost end portion of the small diameter shaft described in the first ball screw shaft 21, the nut 701 and the flange 702. The ball screw shaft 22 also has a step 82 similar to the first ball screw shaft 21, but does not contact the lower surface of the end of the second driven gear 52, and the step 82 and the lower surface of the end of the second driven gear 52. There is a gap 90 between them.

  The end of the second ball screw shaft 22 is disposed so as to be substantially flush with the upper surface of the driven gear 52. A plurality of (two in this embodiment) bearings 62 are provided on the inner wall surface of the hole through which the second ball screw shaft 22 of the upper support member 110 is inserted. The bearing 62 is in contact with the lower stage of the second driven gear 52 that rotates integrally with the second ball screw shaft 22 and is arranged to receive the axial load satisfactorily. Similar to the bearing 61, the number and type of the bearings 62 are not particularly limited.

  Since the second ball screw shaft 22 is not held by the second driven gear 52 so as not to move in the axial direction, the second ball screw shaft 22 is movable in the axial direction. Therefore, in the case of the second ball screw shaft 22, the expansion due to the thermal expansion of the ball screw shaft extends to the upper frame 101 side which is the end portion side movable in the axial direction.

  A movable space is provided above the second ball screw shaft 22 in the casing formed by the upper support member 110 and the top plate 120 so that the end of the second ball screw shaft 22 can move to the upper frame 101 side. Is provided. Like the first driven gear 51, the second driven gear 52 is held by the upper support member 110 so as not to move in the axial direction, so that the second ball screw shaft 22 protrudes from the second driven gear 52 due to thermal expansion. The step 82 can be extended toward the side frame 101 until the step 82 comes into contact with the lower surface of the end of the second driven gear 52, that is, by the gap 90.

  Although the description on the upper frame 101 side is made in FIG. 2, the same can be said for the lower frame 102 side. Only the difference between the lower frame 102 side and the upper frame 101 side will be described. On the lower frame 102 side, the end of the first ball screw shaft 21 is held movably in the axial direction, and the end of the second ball screw shaft 22 is held immovably in the axial direction.

  The lower frame 102 has an opening at the center, and a lower support member 112 is fixed to the lower frame 102 so as to close the opening.

  Since no drive motor is installed on the lower frame 102 side, no driven gear is installed. Instead of the driven gear, a sleeve 71 is connected to the end of the first ball screw shaft 21, and a sleeve 72 is connected to the end of the second ball screw shaft 22, and the first ball screw shaft 21, the sleeve 71, and the second ball screw shaft 22 are connected. The sleeve 72 is fastened through a key material and rotates integrally. The sleeve 71 and the sleeve 72 have the same configuration as the first driven gear 51 and the second driven gear 52 held in the axial direction by the upper support member 110 and are held by the lower support member 112 in the axial direction. ing.

  A nut is screwed to the outermost end of the second ball screw shaft 22, and the nut is in contact with and locked to the lower surface of the end of the sleeve 72.

  The first holding stand 31 holding the first rolling blade 41 is fixed to the first ball screw shaft 21 held axially fixed to the upper frame 101 and axially movable to the lower frame 102 in this way. It is slidably held in the axial direction. Similarly, on the second ball screw shaft 22 held axially movable in the upper frame 101 and immovable in the axial direction on the lower frame 102, the second holding base 32 holding the second rolling blade 42 is pivoted. It is held slidably in the direction.

  The first holding stand 31 and the second holding stand 32 are vertically symmetrical so that the first holding stand 31 is held on the upper side and the second holding stand 32 is held on the lower side, and is held stationary in the axial direction of each ball screw shaft. It arrange | positions at each ball screw shaft so that the distance from the edge part currently made may become the same.

  Since the first holding stand 31 and the second holding stand 32 perform a parallel movement in opposite directions, the first rolling blade 41 and the second rolling blade 42 are not shown between the ball screw shafts (not shown). The workpiece installed in is rolled into a shape that meshes with each cutting tool.

  Even when the ball screw shaft expands due to thermal expansion, the first rolling blade 41 moves in the direction approaching the workpiece by the thermal expansion, and the second rolling blade 42 also moves in the direction approaching the workpiece. Become. Moreover, since the attachment of each holding stand is made the same distance from the end portion held immovably in each axial direction, the moving distance by the thermal expansion is about the same. Therefore, the difference between the distance from the first rolling blade 41 to the workpiece and the distance from the second rolling blade 42 to the workpiece does not change, and rolling can be performed without changing the accuracy due to thermal expansion.

  In the embodiment of the present invention, the drive motor is installed in the upper part of the main body, but the position of the drive motor may be installed in the lower part of the main body, and each ball screw shaft may be driven by a plurality of drive motors. . In the embodiment of the present invention, the rolling direction is the vertical direction, but it is possible to adopt a mode in which the rolling direction is left and right.

  The rolling device of the present invention is not limited to the embodiment described above and shown in the drawings, and can be appropriately changed as necessary without departing from the scope of the invention.

The schematic diagram of one Embodiment of the rolling apparatus of this invention is shown. FIG. 2 is an enlarged view of a portion surrounded by A in the rolling device of FIG. 1.

Explanation of symbols

10, drive motor, 11, drive gear, 21, first ball screw shaft,
22, second ball screw shaft 31, first holding table 32, second holding table 41, first rolling blade 42, second rolling blade 51, first driven gear 52, second driven gear ,
61, bearing, 62, bearing, 71, 72, sleeve, 81, 82, step, 90, gap 100, main body, 101, upper frame, 102, lower frame, 110, upper support member, 112, lower support member , 120, top plate, 701, nut, 702, flange,
703, 704, collar, 705, nut, 706, extension bolt, 707, nut,
708, collar, 709, nut.

Claims (3)

A main body having a pair of upper and lower opposing frames facing each other at a predetermined interval;
A first ball screw shaft and a second ball screw shaft whose ends are rotatably held in parallel with each other on the set of the opposing frames;
A first holding base for holding a first rolling blade, which is slidably held on the first ball screw shaft and moves in the axial direction to roll the workpiece;
Holds a second rolling blade tool that is slidably held by the second ball screw shaft and that moves in the axial direction and in the opposite direction of the first holding stand in synchronization with the first holding stand to roll the workpiece. A second holding stand;
Driving means for synchronously rotating said first ball screw shaft及beauty before Symbol second ball screw shaft,
In the rolling equipment consisting of
The end on the upper side of the first ball screw shaft is rotatably held in an axially stationary frame on the upper frame, and the end on the lower side of the first ball screw shaft is held on the lower frame on the lower side. The upper end of the second ball screw shaft is rotatably held so as to be movable in the axial direction, and the lower end side of the second ball screw shaft is rotatably held by the upper side opposing frame. The rolling device is characterized in that the end portion of the rolling device is held by the lower side opposite frame so as to be axially immovable and rotatable.   2. The rolling device according to claim 1, wherein ends of the first ball screw shaft and the second ball screw shaft, which are held rotatably in the axial direction, are held via bearings and axial locking means. The drive means includes: a drive motor installed on the opposed frame; a drive gear fitted to a motor shaft of the drive motor; and a first driven gear and a second driven gear engaged with the drive gear. Configured,
The drive gear, the first driven gear, and the second driven gear are synchronously rotated. The drive gear, the motor of the drive motor without shifting the synchronous rotational positions of the first driven gear and the second driven gear. The rolling device according to claim 1, wherein the shaft can be attached to and detached from the drive gear.

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