JP2013116490A - Pressurizing device for crowning, and press brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressurizing device for crowning, which facilitates the fine adjustment of a crowning amount, can be reduced in size and is excellent in energy efficiency.SOLUTION: The pressurizing device 9 for crowning includes: a base body 35; a turning body 37 that turns relative to the base body about a predetermined axis CA; and a mobile body 39 that moves relative to the base body in a direction of coming close to or separating from the base body by the turning movement of the turning body.

Description

  The present invention relates to a crowning pressure device and a press brake, and more particularly to a crowning device using a servo motor.

  Conventionally, a press brake having a configuration in which a lower table is crowned using a hydraulic cylinder is known. Further, there is known a press brake having a configuration in which a lower table or the like is crowned using a mechanical type wedge (see, for example, Patent Document 1).

JP 2002-214777 A

  By the way, the conventional press brake using a hydraulic cylinder has a problem that fine adjustment of the crowning amount is difficult because the hydraulic oil has a slight compressibility.

  Also, with the conventional press brake using wedges, fine adjustment of the crowning amount is relatively easy, but since it is necessary to move the wedges linearly, an area for the wedge stroke is required, and the crowning device is In addition to the problem of increasing the size, it is necessary to convert the rotary motion of the output shaft of the servo motor into a linear motion, and thus there is a problem of poor energy efficiency.

  The present invention has been made in view of the above-described problems. A crowning pressurizing apparatus and a crowning pressurizing apparatus that are easy to finely adjust the crowning amount, are easy to downsize, and have high energy efficiency. The object is to provide a press brake that is used.

  The invention according to claim 1 is a base body, a rotating body that rotates relative to the base body about a predetermined axis, and a direction that approaches or separates from the base body by the rotation of the rotating body, A crowning pressure device having a moving body that moves relative to the base body.

  According to a second aspect of the present invention, in the crowning pressurizing apparatus according to the first aspect, the rotating body is disposed between the base body and the movable body, and the base body side of the rotating body. Is supported by the base body via a first rolling bearing, and a slope is formed at a position of the rotating body on the movable body side. The movable body includes a second rolling bearing. The inner ring is integrally provided, the outer ring of the second rolling bearing is engaged with the inclined surface, and the outer ring of the second rolling bearing is engaged with the inclined surface by the rotation of the rotating body. The crowning pressure device is configured such that the position of the joint portion changes and the movable body moves.

  According to a third aspect of the present invention, in the crowning pressure device according to the second aspect, a plurality of the second rolling bearings are provided, and each of the plurality of second rolling bearings is the rotating body. Are arranged on the outside of the movable body at a position that equally distributes the circumference of a predetermined circle centered on the rotation center axis of each of the rotation center axes of the outer rings in the plurality of second rolling bearings, The rotating body is orthogonal to the rotation center axis of the rotating body, and the rotating body includes a rotating body main body portion and a plurality of wedge plates provided integrally with the rotating body main body portion. The crowning pressure device is configured such that the inclined surface is formed on the plate, and the outer ring of the second rolling bearing is engaged with the inclined surface of each wedge plate.

  According to a fourth aspect of the present invention, there is provided a base body formed in a disk shape, a shaft provided on the base body upright from a central portion of one surface in the thickness direction of the base body, On one surface in the thickness direction of the base body, a thrust bearing provided coaxially with the shaft and provided in the base body, is formed in a disc shape, and a through hole is formed in the central portion. A cylindrical recess is formed on the surface of the base, and a rotational input portion is provided on the outer periphery. The shaft passes through the through-hole, and the base on the other side in the thickness direction via the thrust bearing. A rotating body main body supported by the body, coaxially supported by the shaft via a radial bearing and supported by the shaft, and disposed on one surface side in the thickness direction of the base body, and a predetermined width and length The thickness is gradually increasing in the length direction A rectangular parallelepiped wedge is formed in a shape that extends in the thickness direction of the wedge and is bent in an arc shape around an axis that is separated from the wedge by a predetermined distance on one side in the width direction of the wedge. A wedge plate which is formed in a ring shape by combining a plurality of arc-shaped members and is installed coaxially with the shaft in the recess of the rotating body main body, and a regular number having the same number of corners as the number of wedge plates It is formed in a rectangular column shape, a cylindrical through hole is formed at the center, a rotation preventing portion projects from one surface in the height direction, and the shaft passes through the through hole and passes through the radial bearing. So that a part of the other side in the height direction is located in the concave portion of the rotating body main body portion on one surface side in the height direction of the rotating body main body portion so that the shaft is coaxially supported by the shaft. Installed transfers And a cylindrical shaft body and an outer ring rotatably engaged with the shaft body via a rolling element, and the shaft body extends from each central portion of the side surface of the movable body to the movable body. A pressure for crowning, which is provided integrally with the movable body so as to protrude in a direction perpendicular to the side surface of each of the outer rings, and each of the outer rings has a plurality of rolling bearings that form a pair of pairs of the wedge plates. Device.

  According to a fifth aspect of the present invention, the crowning pressure device according to any one of the first to fourth aspects and the support plate supporting the table are installed so as to protrude rearward, and the crowning It is a press brake which has an actuator which rotates the rotating body of a pressurizing device.

  Advantageous Effects of Invention According to the present invention, it is possible to provide a crowning pressure device that is easy to finely adjust crowning, can be easily downsized, and has high energy efficiency.

It is a front view which shows schematic structure of a press brake. It is a side view which shows schematic structure of a press brake, and is the II arrow directional view in FIG. It is a figure which shows schematic structure of the pressurization apparatus for crowning, (a) is a top view, (b) is a figure which shows the IIIB-IIIB cross section in (a). It is a figure which shows a wedge plate, (a) is a top view, (b) is the IVA-IVA cross section in (a), IVB-IVB cross section, IVC-IVC cross section, IVD-IVD cross section, IVE-IVE cross section, It is a figure which shows an IVF-IVF cross section and an IVG-IVG cross section. It is a figure which shows the installation state to the press brake of the pressurizing device for crowning. It is a schematic diagram which shows the operating principle of the pressurizing device for crowning. It is a perspective view which shows the installation state to the press brake of the pressurizing device for crowning.

  A press brake (work bending machine) 1 in which a crowning device 9 according to an embodiment of the present invention is used includes a first die (for example, a die such as a die D) and a second die (for example, a punch P). The plate-like workpiece W (a plate-like workpiece or a plate-like portion of the workpiece) is bent using a die.

  Hereinafter, for convenience of explanation, one horizontal direction is defined as an X-axis direction, another horizontal direction perpendicular to the X-axis direction is defined as a Y-axis direction, and orthogonal to the X-axis direction and the Y-axis direction. The direction (vertical direction) to be used is the Z-axis direction. The X-axis direction is the left-right direction of the press brake 1, and the Y-axis direction is the front-rear direction of the press brake 1.

  As shown in FIGS. 1 and 2, the press brake 1 includes a first mold installation body (for example, a lower table) 5 supported by the frame 3, a second mold installation body (for example, an upper table) 7, The crowning device 9 is provided.

  A flat rear support plate 17 is integrally provided on the lower front side of the frame 3. A front support plate 19 having substantially the same shape as the rear support plate 17 is provided on the front side of the rear support plate 17. The thickness direction of the rear support plate 17 and the front support plate 19 is the Y-axis direction. When viewed from the Y-axis direction, the rear support plate 17 and the front support plate 19 are substantially overlapped with each other, and are developed in the YZ center plane (including the center of the press brake 1 in the Y-axis direction and the Z-axis direction). The planar upper end surface of the rear support plate 17 and the planar upper end surface of the front support plate 19 extend in a straight line in the X-axis direction.

  The front support plate 19 is supported by the rear support plate 17 via a spacer 21. As a result, a predetermined gap (gap whose dimension in the Y-axis direction is equal to the thickness of the spacer 21) 23 is formed between the rear support plate 17 and the front support plate 19.

  Further, a through hole 25 for installing the crowning device 9 is formed in the rear support plate 17 and the front support plate 19. The through-hole 25 is formed in, for example, a rectangular shape, and is formed as a single or a plurality (three in FIG. 1). The through hole 25 includes a lower surface 27 that extends in the horizontal direction and an upper surface 29 that is parallel to the lower surface 27. When viewed from the Y-axis direction, the through hole 25 and the front support plate 19 of the rear support plate 17. The through holes 25 overlap each other.

  Further, when a plurality of through holes 25 are provided, the positions of the through holes 25 coincide with each other in the Z-axis direction, with a predetermined interval in the X-axis direction, and on the YZ center plane of the press brake 1. They are arranged symmetrically.

  The lower table 5 is formed in a rectangular flat plate shape, for example. The thickness dimension of the lower table 5 is slightly smaller than the dimension of the gap 23. The lower table 5 is sandwiched between the rear support plate 17 and the front support plate 19 so that the thickness direction is in the Y-axis direction, and is positioned between the rear support plate 17 and the front support plate 19. ing. However, since the thickness dimension of the lower table 5 is slightly smaller than the dimension of the gap (interval) 23, the lower table 5 is in the state of being sandwiched between the rear support plate 17 and the front support plate 19. The table 5 is movable in the Y-axis direction and the Z-axis direction with respect to the rear support plate 17 and the front support plate 19.

  When viewed from the Y-axis direction, the dimension of the lower table 5 in the X-axis direction is slightly smaller than the dimensions of the rear support plate 17 and the front support plate 19 in the X-axis direction. The both ends of the lower table 5 in the X-axis direction are positioned outside the through hole 25. When viewed from the Y-axis direction, the planar upper end surface and the planar lower end surface of the lower table 5 extend linearly in the X-axis direction. Further, when viewed from the Y-axis direction, the planar upper end surface of the lower table 5 is located above the upper end surfaces of the rear support plate 17 and the front support plate 19, and The end face is located in the middle of the through hole 25 in the Z-axis direction. Thereby, when viewed from the Y-axis direction, a part of the lower table 5 is exposed at the through hole 25.

  Further, the lower table 5 has both ends in the X-axis direction via the pair of columnar shaft members (shaft members arranged symmetrically with respect to the YZ center plane) 31 and the front support plate 17 and the front side. The support plate 19 is supported. Thereby, the lower table 5 is a both-end support beam having both ends supported by the rotation support shaft. Note that the pair of shaft members 31 are located outside the through hole 25 in the X-axis direction.

  The upper table 7 is supported on the frame 3 by a linear guide bearing (not shown) on the upper front side of the frame 3. The upper table 7 is moved and positioned in the Z-axis direction (direction approaching or moving away from the lower table 5) by an actuator (such as a hydraulic cylinder) such as a servo motor 33 via a ball screw (not shown). It has become so.

  The upper table 7 is also formed in a flat plate shape, and is disposed above the lower table 5 away from the lower table 5 so that the thickness direction is the Y-axis direction. When viewed from the Y-axis direction, the upper table 7 is arranged symmetrically with respect to the YZ center plane, and the lower surface of the flat plate-like upper table 7 faces the lower surface of the lower table 5 in parallel and faces the X-axis direction. It extends in a straight line.

  The lower surface of the upper table 7 has the same length as the upper surface of the lower table 5 and is located at the same position as the lower table 5 in the X-axis direction. Furthermore, also in the Y-axis direction, the lower surface of the upper table 7 is located at the same position as the X-axis direction and the upper surface of the lower table 5.

  The servo motors 33 are provided on the left and right sides of the upper table 7 (arranged symmetrically with respect to the YZ center plane). The left servo motor 33A and the right servo motor 33B are driven substantially synchronously. When the pair of servo motors 33 (33A, 33B) is driven, the upper table 7 moves relative to the lower table 5 while the lower surface of the upper table 7 is kept substantially parallel to the upper surface of the lower table 5. It has become. Further, by stopping the driving of the servo motor 33 and preventing the rotation output shaft of the servo motor 33 from rotating (for example, by applying a servo brake to the rotation output shaft), the upper table 7 is positioned and this position is changed. To be maintained.

  Note that the lower table 5 may be moved and positioned in the Z-axis direction instead of or in addition to the upper table 7 being moved and positioned. In any case, any configuration is acceptable as long as the upper table 7 can be relatively moved and positioned in the direction in which the upper table 7 approaches and separates from the lower table 5.

  For example, a first die (for example, a die D) is detachably and integrally installed on the lower table 5 via a die holder DH. A second die (for example, punch P) is detachably and integrally installed on the upper table 7 via, for example, a punch holder PH.

  In the Y-axis direction, the center of the punch (installed punch) P installed on the upper table 7 and the center of the die (installed die) D installed on the lower table 5 coincide with each other. . In FIG. 1, the dimensions in the X-axis direction of the punch P, the punch holder PH, the die D, and the die holder DH are the same as the dimensions in the X-axis direction of the lower table 5 and the upper table 7. , The dimension in the X-axis direction of the punch P, punch holder PH, die D, and die holder DH is smaller than the dimension in the X-axis direction of the lower table 5 and the upper table 7, and the punch P, punch holder PH, die D and the die holder DH are arranged in the X-axis direction at a position biased to the center of the lower table 5 or the upper table 7 or to the left or right.

  When the upper table 7 is raised, the installed punch P is separated from the installed die D above the installed die D as shown in FIG. When the upper table 7 is lowered, the workpiece W is sandwiched between the “V” -shaped concave portion of the die D and the “V” -shaped convex portion of the punch P, and the workpiece W is bent. ing.

  The crowning device 9 is a device that performs crowning on the lower table 5. By the crowning of the lower table 5, the lower table 5 (punch P) becomes a slightly convex curve upward as shown by a broken line L1 in FIG. In addition, instead of or in addition to performing crowning on the lower table 5, crowning may be performed on the upper table 7.

  Here, the crowning device (crowning pressure device) 9 will be described in more detail.

  As shown in FIG. 3, the crowning device 9 includes a base body 35, a rotating body (rotating body) 37, and a moving body 39.

  The rotating body 37 is engaged with the base body 35 via, for example, a rolling bearing (first rolling bearing) 43, and rotates around the base body 35 about a predetermined axis CA extending in the Z-axis direction. It moves (rotates). The rotating body 37 moves only as described above with respect to the base body 35, and cannot perform movements other than rotation.

  The moving body 39 is engaged with the rotating body 37 via, for example, a rolling bearing (second rolling bearing) 45, and approaches or separates from the base body 35 by the rotation of the rotating body 37 (Z-axis direction). It moves linearly with respect to the base body 35. The movable body 39 moves only with respect to the linear movement described above with respect to the base body 35. The lower table 5 is crowned according to the amount of movement of the moving body 39.

  The rotating body 37 is disposed between the base body 35 and the moving body 39. A portion (lower portion) of the rotating body 37 on the base body 35 side is supported by the base body 35 via a first rolling bearing 43 (a thrust bearing constituted by a ball bearing or a roller bearing) 43. A portion of the rotating body 37 on the side of the moving body 39 has an inclined surface (an inclined surface slightly inclined with respect to a horizontal plane orthogonal to the rotating central axis CA of the rotating body 37; an inclined surface inclined about 2 ° to 10 °. ) 41 is formed.

  The moving body 39 is integrally provided with an inner ring (shaft body) 47 of a second rolling bearing (for example, a cam follower) 45, and an outer ring 49 of the second rolling bearing 45 comes into contact with the inclined surface 41 to form a rolling pair. It is engaged. Since the outer ring 49 of the second rolling bearing 45 is in rolling contact with the inclined surface 41, the instantaneous center between the outer ring 49 of the second rolling bearing 45 and the inclined surface 41 is the outer ring 49 of the second rolling bearing 45. Is a portion in contact with the slope 41 (for example, a bus of the outer ring 49).

  In the crowning device 9, the position of the engaging portion (contact portion) between the outer ring 49 of the second rolling bearing 45 and the inclined surface 41 is changed (moved) in the Z-axis direction by the rotation of the rotating body 37 and moved. The body 39 is configured to move in the extending direction (Z-axis direction) of the rotation center axis CA of the rotation body 37. The rolling bearings 43 and 45 are configured to receive a load in the Z-axis direction generated by the movement of the moving body 39.

  A plurality of second rolling bearings 45 are provided. Each of the plurality of second rolling bearings 45 is disposed outside the moving body 39 at a position that equally distributes the circumference of a predetermined circle around the rotation center axis CA of the rotation body 37. Each of the rotation center axes CB of the outer rings 49 in the plurality of second rolling bearings 45 is orthogonal to the rotation center axis CA of the rotating body 37.

  The rotating body 37 includes a rotating body main body 51 and a plurality of wedge plates 53 integrally provided on the rotating body main body 51 with fasteners such as bolts. The plurality of wedge plates 53 are formed in the same shape. Further, the slope 41 described above is formed on the wedge plate 53.

  Each of the outer rings 49 of the second rolling bearing 45 is engaged with each of the inclined surfaces 41 of each wedge plate 53.

  For example, if six second rolling bearings 45 and six wedge plates 53 are provided, the outer ring 49 of the first second rolling bearing 45 is provided on the slope 41 of the first wedge plate 53. And the outer ring 49 of the second second rolling bearing 45 engages with the inclined surface 41 of the second wedge plate 53, and so on. The outer ring 49 of the sixth second rolling bearing 45 is engaged with the slope 41.

  The contact portions between the outer rings 49 of the plurality of second rolling bearings 45 and the inclined surfaces 41 of the plurality of wedge plates 53 are in the X-axis direction and the Y-axis direction regardless of the rotation of the rotating body 37. Are in the same position (all the contact portions are moved together with the movement of the moving body 39 in the Z-axis direction by the rotation of the rotating body 37).

  As a result, the reaction force (the force by which the outer ring 49 of the second rolling bearing 45 pushes the inclined surface 41) generated when the moving body 39 moves or when it moves is equal to each other at each contact portion. It has become.

  The crowning device 9 will be further described.

  The crowning device 9 is provided with a shaft 55. The base body 35 is formed in a disc shape.

  The shaft 55 is formed in a cylindrical shape whose outer diameter is smaller than the outer diameter of the base body 35, and stands upward from the center of one surface (upper surface) in the thickness direction (Z-axis direction) of the base body 35. For example, the base body 35 is integrally provided. The axis of the shaft 55 and the axis of the base body 35 (the rotation center axis of the rotation body 37) CA coincide with each other.

  The first rolling bearing (thrust bearing) 43 is provided on the base body 35 coaxially with the shaft 55 on one surface (upper surface) in the thickness direction of the base body 35. The axis of the thrust bearing 43 and the axis CA of the base body 35 coincide with each other. That is, the housing raceway plate (lower plate; outer ring) 57 of the thrust bearing 43 is provided coaxially with the shaft 55, for example, integrally with the base body 35.

  The rotating body main body 51 is formed in a disc shape, and a cylindrical through hole 61 penetrating in the thickness direction (Z-axis direction) is formed in the central portion. Further, the rotating body main body 51 has a cylindrical recess (a recess coaxial with the through hole 61) 63 on one surface (upper surface) in the thickness direction. The inner diameter of the recess 63 is larger than the inner diameter of the through hole 61.

  A rotating power input unit (for example, an external gear) 65 is integrally provided on the outer periphery of the rotating body main body 51. The axis of the external gear 65 is coaxial with the axis CA of the shaft 55.

  The rotating body main body 51 is installed on one surface (upper surface) side in the thickness direction of the base body 35, and the shaft 55 passes (penetrates) through the through hole 61 of the rotating body main body 51. The rotating body main body 51 is supported on the base body 35 coaxially with the shaft 55 via the thrust bearing 43 on the other surface (lower surface) side in the thickness direction. Further, the rotating body main body 51 is supported by the shaft 55 via a radial bearing (for example, a sliding bearing; bush formed in a cylindrical shape and installed in the through hole).

  The thickness direction (Z-axis direction) of the rotating body main body 51 and the thickness direction of the base body 35 coincide with each other. The rotating body body 51 rotates (rotates) with respect to the base body 35 around the axis CA of the base body 35 and the axis CA of the shaft 55. The thrust bearing 43 is present between the base body 35 and the rotating body main body 51.

  The axis of the rotating body main body 51 and the axis CA of the base body 35 coincide with each other. The axial raceway plate (upper plate; inner ring) 59 of the thrust bearing 43 is composed of a rolling element (for example, a cylindrical roller, but may be composed of a spherical ball or a truncated cone-shaped tapered roller. ) 69 and is supported by the housing raceway plate 57. The shaft raceway plate 59 of the thrust bearing 43 is provided integrally with the rotating body main body 51 on the other surface in the thickness direction of the rotating body main body 51 (the lower surface; the surface on the base body 35 side).

  The outer diameter of the thrust bearing 43 is smaller than the inner diameter of the recess 63 of the rotating body main body 51, and the inner diameter of the thrust bearing 43 is larger than the inner diameter of the through hole 61 of the rotating body main body 51. Further, the thrust bearing 43 receives a load in the extending direction of the rotation center axis CA of the rotating body main body 51 (direction in which the rotating body main body 51 approaches the base body 35; Z-axis direction). 67 is adapted to receive a load in a direction orthogonal to the rotation center axis CA of the rotating body main body 51.

  The wedge plate 53 has a predetermined width and length, and a rectangular parallelepiped wedge whose thickness is gradually increased in the length direction is extended in the thickness direction of the wedge, and the wedge plate 53 on one side in the width direction of the wedge. It is formed in a shape bent in an arc shape around an axis separated from the wedge by a predetermined distance (see FIG. 4).

  A plurality of wedge plates 53 are provided, and a plurality of wedge plates 53 are combined to form a ring shape (annular shape). The plurality of ring-shaped wedge plates 53 are installed coaxially with the shaft 55 in the recess 63 of the rotating body main body 51.

  The wedge plate 53 will be further described.

  One wedge plate 53 is formed in the following three-dimensional shape. One wedge plate 53 draws a rectangle whose vertical dimension is smaller than the horizontal dimension and a rotation axis extending in the vertical direction of the rectangle and separated from the rectangle by a predetermined distance on one plane, The rectangle is rotated by a predetermined angle (for example, 60 °) smaller than 180 ° around the rotation axis while gradually increasing the vertical dimension within a range smaller than the horizontal dimension of the rectangle. Sometimes, it is formed in a substantially fan-shaped three-dimensional shape that is a three-dimensional shape represented by the rectangular locus.

  Note that the amount of increase in the vertical dimension of the rectangle (the amount of increase in the thickness of the wedge plate 53) is, for example, proportional to the rotation angle around the central axis.

  A single wedge plate 53 will be further described with reference to FIG. A central axis shown in FIG. 4A (an axis extending in a direction orthogonal to the paper surface of FIG. 4A) corresponds to the above-described central axis CA. A cross section IVA-IVA shown in FIG. 4A is an axis including the central axis CA.

  A cross section IVB-IVB shown in FIG. 4A is a cross section obtained by rotating the cross section IVA-IVA by 10 ° clockwise around the central axis CA, and the cross section IVC-IVC is centered on the cross section IVA-IVA. The section IVD-IVD is a section rotated about 20 degrees clockwise around the axis CA, and the section IVD-IVD is a section rotated about 30 degrees clockwise about the center axis CA. IVE is a cross section obtained by rotating the cross section IVA-IVA by 40 ° clockwise around the central axis CA. The cross section IVF-IVF is obtained by rotating the cross section IVA-IVA clockwise by 50 around the central axis CA. The section IVG-IVG is a section obtained by rotating the section IVA-IVA by 60 degrees clockwise about the central axis CA.

  FIG. 4B is a cross-sectional view of the wedge plate 53 corresponding to each of the cross sections. As is apparent from FIG. 4B, the increase in the thickness of the wedge plate 53 is proportional to the rotation angle of each cross section.

  FIG. 3A shows a state in which a plurality of wedge plates 53 are installed on the rotating body main body 51 as viewed from the extending direction (Z-axis direction) of the shaft 55 (rotation center axis of the rotating body main body) CA. As described above, each wedge plate 53 has an annular shape in which both end portions in the longitudinal direction (both end portions of the arc in the substantially fan-shaped solid shape) are in contact with each other. In a state where each wedge plate 53 is installed on the rotating body main body 51, the surface (lower surface) facing the inclined surface 41 of the wedge plate 53 comes into contact with the bottom surface of the recess 63 of the rotating body main body 51, The outer peripheral surface of each wedge plate 53 is in contact with the side surface of the recess 63 of the rotating body main body 51 (see FIG. 3B).

  In addition, the inclined surfaces (inclined surfaces) 41 of the wedge plates 53 have the inclination directions that coincide with each other around the axis CA of the shaft 55. For example, it is assumed that six wedge plates 53 are installed on the rotating body main body 51. When the thickness of each wedge plate 53 is measured, for example, in a clockwise direction at a circular portion (a portion at each annular wedge plate 53) in plan view (as viewed from the Z-axis direction), the first sheet The wedge plate 53 is thinnest at one end in the extending direction of the arc, gradually thicker toward the other end, and thickest at the other end. The second wedge plate 53 is also thinnest at one end (the end in contact with the other end of the first wedge plate 53), gradually thicker toward the other end, and thickest at the other end. The thickness of the third and subsequent wedge plates 53 is also changed in the same manner.

  The moving body 39 is formed in a regular polygonal column (for example, a regular hexagonal column) having the same number of corners as the number of wedge plates 53. A cylindrical through hole (a through hole penetrating in the height direction of the prism) 71 is formed in the center of the moving body 39. From one surface (upper surface) in the height direction of the movable body 39, a rotation preventing portion 73 is formed so as to protrude.

  The shaft 55 passes through the through hole 71 of the moving body 39. The moving body 39 is supported by the shaft 55 coaxially with the shaft 55 via a radial bearing (for example, a sliding bearing; bush formed in a cylindrical shape and installed in the through hole). The movable body 39 is installed such that a part of the rotating body main body 51 is located in the recess 63 of the rotating body main body 51 on the other surface (lower surface) side in the height direction of the rotating body main body 51. ing.

  The height direction (Z-axis direction) of the moving body 39 is the depth direction of the recess 63 of the rotating body main body 51. The outer diameter of the moving body 39 is smaller than the inner diameter of the recess 63 of the rotating body main body 51. The value of the height of the main body of the movable body 39 (regular hexagonal column-shaped portion other than the anti-rotation portion 73) is based on the depth value of the recess 63 of the rotating body main body 51 in which the wedge plate 53 is installed at the bottom. Is also getting bigger.

  A plurality of (for example, six) second rolling bearings 45 are provided as many as the number of wedge plates 53. The second rolling bearing 45 includes a cylindrical shaft body 47 and an outer ring 49, and the outer ring 49 is rotatably engaged with the shaft body 47 via a rolling element 77. The rolling element 77 is composed of a cylindrical roller or a spherical ball.

  In the second rolling bearing 45, the shaft body 47 protrudes from the center of each of the six side surfaces of the moving body 39 in a direction perpendicular to the side surface of the moving body 39, and the protruding portion of the shaft body 47 moves. By being engaged with the body 39, the second rolling bearing 45 (shaft body 47) is provided integrally with the moving body 39. And each of the outer ring | wheels 49 located in the front-end | tip side of the shaft body 47 does not have a pair evenly with the wedge plate 53, respectively.

  Each of the second rolling bearings 45 is disposed in an annular space 79 between the recess 63 of the rotating body main body 51 and the moving body 39. Since the second rolling bearings 45 are provided, the movable body 39 and the wedge plate 53 are separated by a slight gap. The shaft 55 and the radial bearing 75 do not protrude from one surface (upper surface) of the moving body 39 in the height direction.

  Further, as described above, the value of the length (axial dimension) of the shaft body 47 is larger than the width value of the outer ring 49, and the proximal end portion of the shaft body 47 projects from the outer ring 49. ing. Then, the base end side portion of the shaft body 47 is inserted into a through hole provided in the moving body 39, and the shaft body 47 is fixed to the moving body 39 by a roll pin 81.

  The rotation stopper 73 is provided as a pair. When the crowning device 9 is installed on the press brake 1, the lower table 5 enters between the pair of detent portions 73 (see FIG. 5 and the like). And even if the rotation body 37 rotates, the lower body 5 prevents the moving body 39 from rotating.

  A servo motor (actuator such as a servo motor 83 with a speed reducer) that rotates the rotating body 37 of the crowning device 9 is a rear support plate (for example, the non-operator side) that supports the table (for example, the lower table 5). The rear support plate 17 is provided so as to protrude rearward.

  More specifically, as shown in FIG. 5, a gear 85 provided on the rotation output shaft of the servo motor 83 meshes with the gear 65 of the rotating body 37, and is rotated by the rotational force of the rotation output shaft of the servo motor 83. The moving body 37 is configured to rotate. A housing of the servo motor 83 (a housing that rotatably supports the rotation output shaft) is integrally provided on the rear support plate 17 via a bracket 87, as shown in FIG.

  As already understood, the crowning device 9 is installed in the through hole 25 with the base body 35 on the lower side and the moving body 39 on the upper side. The crowning device 9 is provided in each of the through holes 25 (see FIG. 1). In a state where the crowning device 9 is installed in the through hole 25, the lower surface of the base body 35 is in contact with the lower surface 27 of the through hole 25, and the base body 35 is provided integrally with the support plates 17 and 19. It is desirable to have a configuration.

  The upper surface of the moving body 39 (the upper surface of the prisms excluding the anti-rotation portion 73) is in contact with the lower surface of the lower table 5, and as described above, the pair of anti-rotation portions 73 sandwich the lower table 5. . The distance between the pair of rotation stoppers 73 is slightly larger than the thickness of the lower table 5. The upper end of the rotation preventing portion 73 is located below the upper surface 29 of the through hole 25.

  A part of the external gear 65 of the crowning device 9 protrudes rearward from the rear support plate 17, and the gear 85 of the servo motor 83 meshes with the protruding portion.

  Next, the operation of the press brake 1 will be described.

  In the initial state, it is assumed that the upper table 7 is raised, the crowning device 9 is not operating, and the upper surface of the lower table 5 is not a convex shape but a horizontal flat surface. Further, in the state where the crowning device 9 is not in operation, unlike the case shown in FIG. 3A, the rotation body 37 is slightly smaller than 30 ° clockwise from the state shown in FIG. (For example, about 28 °), the movable body 39 is located at the lowest position (the distance between the lower surface of the base body 35 and the upper surface of the movable body 39 is the smallest). . In the crowning device 9, the rotating body 37 rotates counterclockwise to an angle slightly smaller than 30 ° (for example, about 28 °) from the state shown in FIG. . In a state of rotating about 28 ° counterclockwise, the movable body 39 is located at the uppermost position (the distance between the lower surface of the base body 35 and the upper surface of the movable body 39 is the largest). Eventually, the rotating body 37 of the crowning device 9 rotates, for example, by an angle of 58 °.

  In the initial state, when the workpiece W is placed on the die D as shown in FIG. 1 and a start button (not shown) is pressed, the upper table 7 is lowered under the control of the control device 15 and the workpiece W is bent. The Before the bending process is performed, the crowning device 9 is operated and the lower table 5 is crowned at least at any time when the bending process is performed.

  After the end of the bending process, the crowning device 9 stops operating, the upper table 7 moves up, and the bent work W is carried out to return to the initial state.

  Note that the servo motor 83 of the crowning device 9 can apply a brake such as a servo brake to the rotation output shaft, and can maintain the rotation angle of the rotation output shaft. When the workpiece W is bent, the crowning amount can be maintained even if a pressing force (reaction force of bending) is applied to the lower table 5 from the workpiece W.

  According to the crowning device 9 of the press brake 1, since the rotating body 37 and the moving body 39 are used, fine adjustment of the crowning amount is easier than that of the hydraulic cylinder (accurate crowning can be performed). In addition, since the rotating body 37 is configured not to be linearly moved but to be crowned, there is no wedge that moves linearly as in the prior art, and the apparatus is miniaturized. In addition, since the rotational motion of the servo motor 83 is transmitted to the rotating body 37 without being converted into a linear motion, the energy efficiency is improved compared to the conventional one.

  Further, according to the crowning device 9, the rotating body 37 is supported by the base body 35 via the rolling bearing 43, and the moving body 39 is also engaged with the rotating body 37 via the rolling bearing 45 (FIG. 3 (b), see FIG. 6 which is a schematic diagram), and energy efficiency is further improved.

  In addition, since the base body 35, the rotating body 37, and the moving body 39 are engaged via the rolling bearings 43 and 45, the amount of crowning can be achieved even during the main pressurization (during bending to the workpiece W). Can be adjusted. That is, in the case of using a conventional wedge that does not use the rolling bearings 43 and 45, the wedge cannot move due to a large frictional force such as the inclined surface of the wedge during the main pressurization. The amount cannot be adjusted. On the other hand, the crowning device 9 uses the rolling bearings 43 and 45. Therefore, even during the main pressurization, the increase in the frictional force is negligible. Can be adjusted.

  Moreover, according to the crowning apparatus 9, since the wedge plate 53 is divided | segmented, the manufacture of the wedge plate 53 becomes easy. Further, since the crowning load is received by the inclined surface 41 of the wedge plate 53, a large crowning load can be generated. Further, since the crowning load is received by the plurality of inclined surfaces 41 and the plurality of bearings 45, the crowning load is dispersed, and a larger crowning load can be received without overloading the components of the crowning device 9. it can.

  In order to increase the crowning load, the outer diameter (diameter) of the crowning device 9 can be increased, or the number of bearings 45 and wedge plates 53 can be increased. can do. Conversely, when the crowning load may be small, the crowning device 9 can be downsized by reducing the outer diameter (diameter) of the crowning device 9 or the like. That is, the crowning device 9 can flexibly respond to a request for changing the magnitude of the crowning load.

  By installing the servo motor 83 on the support plate 17 in the crowning device 9, the crowning device 9 can be installed on the press brake 1 without increasing the size of the press brake 1. Further, if the servo motor 83 is installed on the rear side of the rear support plate 17, it does not disturb the operator. Furthermore, even when a plurality of crowning devices 9 are provided, it is easy to drive each of the crowning devices 9 individually independently, and crowning can be performed in a wider range than before. .

DESCRIPTION OF SYMBOLS 1 Press brake 5 Table 9 Pressing device for crowning 17 Support plate 35 Base body 37 Rotating body 39 Moving body 41 Slope 43 First rolling bearing (thrust bearing)
45 Second rolling bearing 47 Inner ring (shaft)
49 Outer ring 51 Rotating body main body 53 Wedge plate 55 Shaft 61 Through hole 63 Recessed portion 65 Power input portion 67 Radial bearing 73 Non-rotating portion 75 Radial bearing 77 Rolling body 83 Cutuator CA, CB Rotation center shaft

Claims (5)

A base body,
A rotating body that rotates relative to the base body about a predetermined axis;
A moving body that moves relative to the base body in a direction approaching or separating from the base body by rotation of the rotating body;
A pressure device for crowning, comprising: The crowning pressure device according to claim 1,
The rotating body is disposed between the base body and the moving body, and the base body side portion of the rotating body is supported by the base body via a first rolling bearing, A slope is formed in the movable body side part of the rotating body,
The moving body is integrally provided with an inner ring of a second rolling bearing, and an outer ring of the second rolling bearing is engaged with the inclined surface,
The pressure for crowning, wherein the movable body moves by changing the position of the engaging portion between the outer ring of the second rolling bearing and the inclined surface by the rotation of the rotating body. apparatus. The pressure device for crowning according to claim 2,
A plurality of the second rolling bearings are provided, and each of the plurality of second rolling bearings is at a position that equally distributes the circumference of a predetermined circle around the rotation center axis of the rotating body. Each of the rotation center axes of the outer rings in the plurality of second rolling bearings is orthogonal to the rotation center axis of the rotating body, and is arranged outside the moving body.
The rotating body includes a rotating body main body and a plurality of wedge plates provided integrally with the rotating body main body, and the inclined surfaces are formed on these wedge plates,
A crowning pressure device, wherein the outer ring of each of the second rolling bearings is engaged with each of the slopes of each wedge plate. A base body formed in a disc shape;
A shaft provided on the base body upright from the center of one surface in the thickness direction of the base body;
A thrust bearing provided on the base body coaxially with the shaft on one surface in the thickness direction of the base body;
It is formed in a disc shape, a through hole is formed in the central portion, a cylindrical recess is formed on one surface in the thickness direction, a rotational power input portion is provided on the outer periphery, and the shaft is connected to the through hole And is supported by the base body via the thrust bearing on the other surface side in the thickness direction, and is supported by the shaft coaxially with the shaft via a radial bearing, in the thickness direction of the base body. A rotating body main body installed on one surface side;
A rectangular parallelepiped wedge having a predetermined width and length and gradually increasing in thickness in the length direction is stretched in the thickness direction of the wedge, and a predetermined distance from the wedge on one side of the wedge width direction. It is formed in a shape that is bent in an arc shape around an axis that is only a distance away, and is formed into a ring shape by combining a plurality of this arc shape, and is installed coaxially with the shaft in the recess of the rotating body main body A wedged plate,
It is formed in a regular polygonal column shape having the same number of corners as the number of wedge plates, a cylindrical through hole is formed in the center, and a detent portion projects from one surface in the height direction, and the shaft Passes through the through-hole and is supported by the shaft coaxially with the shaft via a radial bearing, and a part of the other side in the height direction on one surface side in the height direction of the rotating body main body. A moving body installed so as to be positioned in the recess of the rotating body main body,
A cylindrical shaft body and an outer ring rotatably engaged with the shaft body via a rolling element, and the shaft body extends from the center of each side surface of the movable body to the side surface of the movable body. A plurality of rolling bearings that protrude in an orthogonal direction and are provided integrally with the movable body, each of the outer rings forming a pair of pairs of the wedge plates;
A pressure device for crowning, comprising: A pressure device for crowning according to any one of claims 1 to 4,
An actuator that protrudes rearward from the support plate supporting the table and rotates the rotating body of the crowning pressure device;
A press brake characterized by comprising:

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