JP3692345B2 - Knife bending machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention is a sheet processing knife (hereinafter abbreviated as a long thin plate) used for punching a sheet-like material such as paper, plastic, cardboard or the like into a predetermined shape by punching press processing or the like, or for making a crease. In particular, it is possible to perform bending with a large bending radius at a time, and to influence the viscoelastic properties (springback, etc.) of the knife. The present invention relates to a knife bending apparatus that can perform bending without being subjected to bending.
[0002]
[Prior art]
  Conventionally, when a long thin plate-like knife used for punching press processing is bent into a predetermined shape, an inner shaft formed with an opening through which the knife is inserted, and the vicinity of the opening are formed in the inner portion. A movable portion that moves in the circumferential direction of the shaft, and sends out the knife from the opening, presses the delivered knife by the movable portion, and presses the side of the knife against the opening Thus, there is known a knife bending apparatus for bending the knife into a predetermined shape (see, for example, Patent Document 1 and Patent Document 2).
  FIG. 6 is a diagram for explaining the configuration of a portion (corresponding to the bending portion 5 in the present invention) related to bending in the conventional knife bending apparatus described above.
  6A is an exploded perspective view of the bending portion 5 ″ in the conventional knife bending apparatus, and FIG. 6B is a sectional view of the bending portion 5 ″ in which the knife is being bent. Indicates.
  As shown in the figure, a bending section 5 ″ in a conventionally known bending apparatus includes a knife 100 that is intermittently fed in a longitudinal direction by conveying rollers 92 and 93 (not shown in FIG. 6A). An inner shaft 10 having an opening 11 to be passed therethrough, and a movable portion 12 that is externally fitted to the inner shaft 10 and moves in the circumferential direction of the inner shaft 10 in the vicinity of the opening 11. By pressing the knife 100 by the movable part 12 when the feeding is stopped, and pressing the side part of the knife 100 that has passed through the opening part 11 against the corner part 11a or 11b of the opening part 11, The knife 100 is bent into a predetermined shape.
  6B, the movable portion 12 is rotated in the direction of the arrow X shown in the drawing (counterclockwise direction in FIG. 6), and the knife 100 is pushed to the corner portion 11b (right side in FIG. 6). Although the case where the knife 100 is bent in the direction of the arrow Y shown in the drawing by being applied is shown, when the movable part 12 is rotated in the direction opposite to the direction of X (clockwise direction), Contrary to the figure, the knife 100 is pressed against the corner 11a (left side in FIG. 6), and the knife 100 is bent in the direction opposite to the arrow Y.
  With such a configuration, in a conventionally known knife bending apparatus (bending section 6 ′), the amount of feeding the knife 100 and / or the pressing force for pressing the knife 100 by the movable section 12 is in a desired shape. Alternatively, the knife 100 can be processed into a predetermined shape by suitably setting according to the material of the knife 100 or the like.
[0003]
[Patent Document 1]
          Japanese Patent No. 2664889
[Patent Document 2]
          JP-A-6-328133
[0004]
[Problems to be solved by the invention]
  As described above, the conventionally known knife bending apparatus has a structure in which the knife is pushed and bent by pressing the knife against the corner portion 11a or 11b by the pressing force of the movable portion 12.
  Incidentally, the pressing force or pressing amount by the movable part 12 cannot be set to a predetermined value (torque / pushing amount) or more due to the strength of the movable part 12 and other factors. That is, the conventionally known knife bending apparatus can only perform bending with a predetermined bending radius (hereinafter referred to as a maximum processing radius) corresponding to the predetermined pressing force.
  As a result, when it is desired to process the knife with a large bending radius that is greater than the maximum processing radius, the bending process cannot be performed at one time, and the knife is intermittently (repetitively) sent out, and the movable is performed each time the feeding is performed. By pressing the knife 100 with the part 12, it was forced to bend gradually (gradually).
  As a result, the bending process is actually performed a plurality of times, so that the processing errors are accumulated in combination with the machine manufacturing accuracy, resulting in a decrease in processing accuracy and an increase in working time. .
  Furthermore, it is difficult to correct the viscoelastic properties (spring back, etc.) of the knife in a conventionally known knife bending apparatus.
  This difficulty is particularly noticeable when the bending radius of the bent portion (the portion to be bent) of the knife 100 is small, and when the pressing force pressed by the movable portion 12 and the knife feed amount are small, the viscosity is reduced. The effect of elastic properties could not be completely removed, and it was extremely difficult to obtain the desired bending radius (shape) of the knife.
  Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a long thin plate-like knife that is fed in the longitudinal direction, and a knife that performs bending by pressing the knife with a movable part. In a bending apparatus, a knife bending apparatus based on a completely new basic principle capable of bending the knife largely at a time and not affected by the viscoelastic properties (springback, etc.) of the knife is provided. It is in.
[0005]
[Means for Solving the Problems]
  In order to solve the above-mentioned problems, the first invention is a knife bending apparatus for pressing and bending a movable part against the knife in a state where a long thin plate-like knife is held by a holding part.
  When the movable part is applied to the knifeProvided with an excitation mechanism that vibrates the holding part.The vibration direction by the vibration mechanism is a vertical axis direction parallel to the knife surface and perpendicular to the knife longitudinal direction.It is comprised as a knife bending apparatus characterized by this.
  With this configuration, new energy (collision energy, friction energy, or the like) is applied to the knife that is pushed and bent by the movable part, in addition to the pressing force by the movable part, due to the vibration of the holding part. , The new energy softens the vicinity of the bent portion of the knife. That is, according to the present invention, the knife can be bent while the vicinity of the bent portion of the knife is softened.
  Therefore, even if the pressing force of the movable part is the same value (torque) as that of a conventionally known apparatus, it is possible to realize a larger maximum processing radius.
  In other words, since bending with the same bending radius can be performed with a smaller pressing force, it is possible to prevent damage (bending, chipping, etc.) of the movable part, as well as the processing accuracy. This is also advantageous.
  Furthermore, pushing and bending while softening the bending portion of the knife enables more reliable plastic deformation, and even when the bending radius is small, the effect of the viscoelastic properties (springback, etc.) of the knife is small. High-accuracy bending can be achieved.
[0006]
  The second aspect of the present invention providesA state in which an inner shaft formed with an opening through which a long thin plate-like knife is inserted and a movable portion that moves in the vicinity of the opening in the circumferential direction of the inner shaft, the knife being held by the inner shaft In a knife bending apparatus that presses and bends the knife by pressing the movable portion with the movable portion and pressing the side of the knife against the opening,
A knife bending process comprising a vibration mechanism that vibrates the inner shaft when the movable part is applied to the knife, and the vibration direction of the vibration mechanism is the axial direction of the inner shaft. Device.
Furthermore, in a third aspect of the invention, the excitation mechanism is
According to a second aspect of the invention, there is provided an electric motor provided in the vicinity of the end of the inner shaft, and a columnar first rotating member that is rotated by the electric motor and has a predetermined slope formed on the bottom surface thereof. The rotating member 1 is configured to rotate in a state where the predetermined inclined surface is in contact with the edge of the inner shaft.
Furthermore, in the fourth invention, the cylindrical first rotating member is formed with a notch that can elastically displace the first rotating member in the axial direction of the inner shaft. A knife bending apparatus according to claim 3.
[0007]
  Further, the fifth invention comprises an inner shaft formed with an opening through which a long thin plate-like knife is inserted, and a movable portion that moves in the vicinity of the opening in the circumferential direction of the inner shaft, In a knife bending apparatus that presses the movable part while holding it on the inner shaft, and presses and bends the knife by pressing the side of the knife against the opening,
A knife bending mechanism is provided, comprising a vibration mechanism that vibrates the inner shaft when the movable portion is applied to the knife, and a vibration direction of the vibration mechanism is a circumferential direction of the inner shaft. A sixth aspect of the present invention relates to the sixth aspect, wherein the vibration exciting mechanism is
An electric motor provided near the end of the inner shaft; a second rotating member having a cylindrical shape that is rotated by the electric motor and has an oil reservoir for containing lubricating oil formed on a peripheral surface thereof; and an edge of the inner shaft And a recess having an oil reservoir for containing lubricating oil formed on its wall surface, the second rotating member being configured to rotate while being pivotally attached to the recess. A knife bending apparatus according to claim 5.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. It should be noted that the following embodiments and examples are examples embodying the present invention, and do not limit the technical scope of the present invention.
  Here, FIG. 1 is a diagram showing the entire knife bending apparatus according to the embodiment of the present invention, FIG. 2 is a front sectional view of the first embodiment of the bending section, and an enlarged view of the main part, and FIG. FIG. 4 is a diagram for explaining the vibration in the circumferential direction of the inner shaft in the bending portion, and FIG. 5 shows the state of the knife during bending. FIGS. 6A and 6B are a perspective view of a main part of a conventional knife bending apparatus, a cross-sectional view, and FIG. 7 showing another embodiment of the bending section.
  The knife bending apparatus A according to the present embodiment is embodied as shown in FIG. 1 ((a): plan view, (b): side view).
  As shown in the figure, a knife bending apparatus A according to an embodiment of the present invention includes a knife stock part 1, a bending correction part 2, a knife conveying part 3, a pre-processing part 4, a bending part 5, a cutting part 6, a display. The section 7 and the operation section 8 are schematically configured, and the knife stock section 1 and the bending correction section 2 are arranged on a gantry B which forms a horizontal surface at a predetermined height along the knife conveying direction. , The knife conveying section 3, the pre-processing section 4, the bending section 5, and the cutting section 6 are arranged in this order.
  Here, the knife stock unit 1 accommodates a knife before processing in a spiral shape, and supplies the stored knife according to the conveyance of the knife by the knife conveyance unit 3.
  The bending correction unit 2 is provided in the middle of a conveyance path from the knife stock 1 to the knife conveyance unit 3, and corrects deformation (curvature) generated in the knife during accommodation (storage) in the knife stock 1. Is. Therefore, for example, it is configured by combining a plurality of rollers and the like, and the knife is conveyed while warping the knife in the direction opposite to the direction wound when the knife stock 1 is stored.
  The knife transport unit 3 is configured by combining, for example, a plurality of pulse motors, clamps, and the like, and the pretreatment is performed by providing a predetermined amount of the knife stored in the knife stock unit 1 downstream in the transport direction. It conveys to part 4 and others.
  The pre-processing unit 4 is a process of cutting the knife (nick process) with respect to the knife before bending, or a process of forming a predetermined notch on the back side opposite to the blade surface of the knife ( Bridge processing) and the like.
  The bending section 5 finishes the pretreatment in the pretreatment section 4 and bends the conveyed knife into a predetermined shape. (Details will be described later)
  The cutting part 6 cuts the knife bent by the bending part 5 at a predetermined position (length) as required.
  The operation unit 8 performs various operations such as data input such as a desired machining shape (machining angle) and various settings, and the operation result is displayed on the display unit 7. . The display unit 7 displays information about the knife processing or the processing status one by one.
  Although not shown in the figure, a control unit is provided in the knife bending apparatus A. The control unit performs integrated control of the above-described units so as to bend the knife into a predetermined shape based on the processing data and setting values input from the operation unit 8.
  With such a configuration, in the knife bending apparatus A, after the knife accommodated in the knife stock unit 1 is corrected by the bending correction unit 2 and subjected to predetermined processing by the preprocessing unit 4, It is conveyed to the bending section 5. Then, a predetermined bending process is performed by the bending unit 5, and when the bending process is finished, the knife is cut by the cutting unit 6 to complete the processing (processing).
  As described above, the basic configuration or processing procedure of the knife bending apparatus A according to this embodiment is the same as that of a conventionally known apparatus.
  However, the knife bending apparatus A is different from a conventionally known apparatus in the configuration of the bending section 5 and has a remarkable effect. Therefore, the bending section which is a feature of the present invention will be described below. 5 will be described in detail.
[0009]
  Here, the configuration of the first embodiment of the bending portion will be described with reference to FIG.
  2A is a front sectional view of the bending portion 5 according to the first embodiment as viewed from the knife conveying direction, and FIG. 2B is a plan view of the inner shaft 10 provided in the bending portion 5. 2C is a cross-sectional view taken along arrow D of the bending portion 5, and FIG. 2D is an enlarged view of the first rotating member 20 provided in the bending portion 5.
  As shown in FIG. 2 (a), the bending portion 5 includes an inner shaft 10, a movable portion 12, and a vibration mechanism 5a. The vibration mechanism 5a includes a motor M, a first vibration mechanism 5a. The rotating member 20 and the steel ball 21 are provided.
  The movable part 12 has a substantially cylindrical shape, and is connected to a motor (not shown) fixed to a lower base B2 (part of the base B or connected to the base B and fixed to the apparatus body). At the same time, the lower base B2 and the upper base B1 (part of the base B or connected to the base B and fixed to the apparatus main body) are supported by bearings 30b and 30a to rotate the motor. Accordingly, it can rotate in the circumferential direction. The movable portion 12 is formed with a first opening 13 and a second opening 14 (refer to FIG. 2C) at positions corresponding to the opening 11 formed in the inner shaft 10. Thereby, the knife conveyed to the bending section 5 can be carried in from the second opening 14 and can be carried out from the first opening 13 after being inserted through the opening 11 of the inner shaft 10. Further, the movable portion 12 (that is, the edge portion of the first opening portion 13) is rotated by rotating the movable portion 12 with the knife held (inserted) in the opening portion 11. The knife can be bent by pressing the knife and pressing the side of the knife against the opening 11. (See FIG. 5).
  The inner shaft 10 has a substantially cylindrical shape having a disk-like end portion 10 ', and has a cross-sectional shape for reducing frictional resistance caused by rotational sliding with the movable portion 12 (approximately six in this embodiment). The opening 11 for inserting the knife into the predetermined position is formed, and the hole 22 is inserted into the movable portion 12 from above and formed in the disk-shaped end 10 ′. It is fixed to the upper base B1 by positioning pins 22 inserted into '(see the plan view 2 (b)). Here, the positioning pin 22 restricts rotation of the inner shaft 10 in the circumferential direction, and does not restrict movement in the axial direction. That is, the inner shaft 10 is configured to be slidable in the movable portion 12 with respect to the axial direction indicated by the arrow C in the drawing. Furthermore, a compression spring 19 is provided at an end (lower end) of the inner shaft 10 on the side inserted with respect to the movable portion 12 to urge the inner shaft 10 upward in the axial direction. It is configured as follows. As a result, the inner shaft 10 can be periodically vibrated in the axial direction in accordance with axial vibration (action) provided by a vibration mechanism 5a described later. For example, the compression spring 19 may be a coil spring or an air spring.
  The vibration mechanism 5a is provided on the motor M, an output shaft of the motor M, a columnar first rotating member 20 having a predetermined slope formed on the bottom surface thereof, and an upper end of the inner shaft 10. And a steel ball 21 in contact with the bottom surface of the first rotating member 20, and the eccentric motion (axial direction) of the bottom surface of the first rotating member caused by the rotation of the motor M Reciprocating motion) to the inner shaft 10 via the steel ball 21. In order to prevent the steel ball 21 from separating from the center of the upper end of the inner shaft 10, the upper end surface of the inner shaft 10 accommodates the steel ball 21 as shown in FIG. A fixing hole 21 'is formed. Further, the region O formed (sealed) by the back surface of the plate 24, the inner wall of the spacer 25, the inner wall of the upper base B1, and the upper surface of the disk-shaped end portion 10 ′ of the inner shaft 10 is filled with lubricating oil, Lubrication is performed by centralized oil supply to each part and uneven wear is prevented.
  Here, the motor M is fixed to the plate 24. The plate 24 is fixed together with the spacer 25 by a fixing screw 23 in the vicinity of the end of the inner shaft 10. The motor M is positioned so that the shaft center of the motor M and the shaft center of the inner shaft 10 are slightly shifted.
  With the configuration in which the vibration mechanism 5a is fixed by the fixing screw 23 as described above, the first rotating member 20 pivots the inner shaft 10 together with the steel ball 21 as shown in FIG. In order to push downward in the direction, the inner shaft 10 is elastically supported at a position where the force pushed by the first rotating member 20 and the biasing force by the compression spring 19 balance.
  When the motor M is rotated in this state, the first rotating member 20 having the inclined surface formed on the bottom surface is rotated, and the steel ball 21 in contact with the bottom surface (inclined surface) of the first rotating member 20 , Eccentric motion (reciprocating motion in the axial direction) according to the slope is transmitted. As a result, a force from above in the axial direction acts on the inner shaft 10, and the inner shaft 10 is periodically vibrated in the axial direction (the direction of arrow C).
  The first rotating member 20 is preferably provided with a notch 20 ′ as shown in FIG. 2 (d). By forming such a notch, it is possible to elastically displace the bottom surface of the first rotating member 20 in the direction indicated by the arrow E. As a result, it is possible to suppress the play that occurs between the first rotating member 20 that rotates at a high speed and the steel ball 21, and it is possible to prevent the occurrence of vibration or noise due to the play.
  As described above, the bending portion 5 externally fits the movable portion 12 fixed to the lower mount B2 in a cantilever manner to the inner shaft 10 fixed to the upper mount B1 in a cantilever manner. Accordingly, in addition to the conventional configuration in which both are rotatably fixed, a new configuration in which the inner shaft 10 is vibrated in the axial direction is added.
  Thereby, according to the said bending process part 5, by rotating the said movable part 12 and pressing a knife, this knife is pressed by pressing the side part of this knife against the said inner shaft 10 (opening part 11). When bending is performed, not only the pressing force by the movable portion 12 but also new energy (collision energy, friction energy, etc.) due to vibration of the inner shaft 10 is applied to the knife. Therefore, it becomes possible to perform bending of the knife with the new energy softened in the vicinity of the bent part of the knife, and it is possible to bend larger than conventional devices, and at the same time, viscoelastic properties Accurate plastic deformation without the influence of (spring back, etc.) is possible.
  In this embodiment, as the motor M, a high-speed rotating motor of 10,000 rpm to 40000 rpm is used, and the vibration with respect to the inner shaft 10 is set to 10,000 times / minute. However, the setting of this vibration is not limited to this value, and it is desirable to change it according to the material of the knife to be processed or the bending angle. Furthermore, the amplitude and period of vibration generated in the inner shaft 10 can be arbitrarily adjusted by changing the shape of the bottom surface of the first rotating member 20 (inclination angle, number of irregularities, etc.) The amount of energy applied to the bent portion of the knife can be adjusted.
  In this embodiment, the motor M is provided with its output shaft in the same direction as the axial direction of the inner shaft 10, but the motor M has its output shaft perpendicular to the axial direction of the inner shaft 10. The first rotating member 20 is provided eccentrically with respect to the output shaft of the motor M, and the steel ball 21 is brought into contact with the peripheral surface of the first rotating member 20 to vibrate. The so-called eccentric cam can be used.
[0010]
  Next, the configuration of the second embodiment of the bending portion will be described with reference to FIG.
  3A is a front sectional view of the bending portion 5 ′ according to the second embodiment as viewed from the knife conveying direction, and FIG. 3B is a second rotation provided in the bending portion 5 ′. FIG. 3C is an enlarged view of the member 26 (a region surrounded by a one-dot broken line J in FIG. 3A), and FIG. 3C is a plan view of the inner shaft 10 provided in the bending portion 5 ′ and the second rotating member 26. Is
  As shown in FIG. 3 (a), the bending portion 5 ′ is schematically configured to include an inner shaft 10, a movable portion 12, and a vibration mechanism 5b, and the vibration mechanism 5b includes a motor M, a second vibration mechanism 5b. And a recess 10a formed at the edge of the inner shaft 10.
  Here, the bending portion 5 ′ has a structure substantially similar to that of the bending portion 5 according to the first embodiment described above, but the bending portion 5 does not vibrate in the axial direction. The bending portion 5 'differs from the above in that it gives vibration in the circumferential direction.
  The movable portion 12 has a substantially cylindrical shape, is connected to a motor (not shown) fixed to the lower base B2, and is supported by bearings 30b and 30a on the lower base B2 and the upper base B1, It is freely rotatable in the circumferential direction according to the rotation of the motor. The movable portion 12 is formed with a first opening 13 and a second opening 14 at positions corresponding to the opening 11 formed in the inner shaft 10 as in the case of the bending portion 5. . Thereby, the knife conveyed to the bending section 5 can be carried in from the second opening 14 and can be carried out from the first opening 13 after being inserted through the opening 11 of the inner shaft 10. Further, the movable portion 12 (that is, the edge portion of the first opening portion 13) is rotated by rotating the movable portion 12 in a state where the knife is held (inserted) in the opening portion 11. The knife can be bent by pressing the knife and pressing the side of the knife against the opening 11 (see FIG. 5).
  The inner shaft 10 has a substantially cylindrical shape having a disk-like end portion 10 ', and has a cross-sectional shape for reducing frictional resistance caused by rotational sliding with the movable portion 12 (approximately six in this embodiment). The opening portion 11 through which the knife is inserted is formed at a predetermined position, and the opening portion 11 is inserted into the movable portion 12 from above and is formed at the disc-shaped end portion 10 ′. It is fixed to the upper base B1 by positioning pins 22 inserted into the holes 22 '(see the plan view 3c). Here, the hole 22 'into which the positioning pin 22 is inserted is formed to allow a slight amount of rotation (indicated by arrows L1 and L2 in the drawing) of the inner shaft 10 in the circumferential direction. . Further, the movement of the inner shaft 10 in the axial direction is restricted by attaching a vibration mechanism 5b described later to the upper portion thereof. That is, the inner shaft 10 is configured to be movable only in the circumferential direction indicated by the arrows L1 and L2 in FIG. 3C, and the circumferential vibration (action) provided by the vibration mechanism 5b described later. Accordingly, the inner shaft 10 can be periodically vibrated in the circumferential direction.
  The vibration mechanism 5b is provided in a motor M and an output shaft of the motor M, and has a cylindrical shape in which an oil reservoir 27 (see FIG. 3B) for containing lubricating oil is formed on the peripheral surface. The second rotating member 26 and the concave portion provided in the disk-like end portion 10 ′ of the inner shaft 10 and having an oil reservoir 28 (see FIG. 3B) for accommodating lubricating oil formed on the wall surface thereof. And a pulsation of lubricating oil between the oil reservoir 27 provided in the second rotating member and the oil reservoir 28 provided in the recess 10a, which is generated by the rotation of the motor M. This is a configuration for transmitting (pressure fluctuation) to the inner shaft 10 (details will be described later). A region O formed (sealed) by the back surface of the plate 24, the inner wall of the upper base B1, and the upper surface of the disk-like end portion 10 'of the inner shaft 10 is filled with lubricating oil, and concentrated oil supply to each portion. Lubrication is performed and uneven wear is prevented.
  Here, the motor M is fixed to the plate 24. The plate 24 is fixed near the end of the inner shaft 10 by a fixing screw 23. The motor M is positioned so that the axis of the motor M is aligned with the axis of the inner shaft 10.
  With the structure in which the vibration mechanism 5b is fixed by the fixing screw 23, the second rotating member 26 is pivotally attached to the recess 10a as shown in FIG. With such a configuration, the inner shaft 10 is fixed in the axial direction, and supported so as to be able to move (vibrate) by a small amount only in the directions (circumferential directions) indicated by arrows L1 and L2.
  When the motor M is rotated in this state, the second rotating member 26 is rotated, the oil reservoir 27 formed on the peripheral surface thereof, and the recess 10a to which the rotating member 26 is pivotally attached. Lubricating oil pulsation occurs between the oil reservoir 28 formed on the wall surface, and as a result, the inner shaft 10 can be periodically vibrated in the circumferential direction.
[0011]
  3 (b), (c), FIG. 3 (b), and FIG. 3 (b), FIG. This will be described with reference to FIG.
  Here, as shown in FIG. 3B, the oil reservoirs 27 and 28 are formed in a region where the second rotating member 26 and the recess 10a are pivotally attached (slidably contacted).
  Further, as shown in FIG. 3C, the oil sump 27 formed on the peripheral surface of the second rotating member 26 extends in the rotational directions K1 and K2 of the second rotating member 26, respectively. The oil sump 28 formed on the wall surface of one of the recesses 10a is reversely formed with 27a and 27b formed so that the upstream side in the rotational direction is deepest and gradually becomes shallower as it goes downstream in the rotational direction. Further, in each of the rotation directions K1 and K2 of the second rotation member 26, the upstream side in the rotation direction is the shallowest, and the depth is gradually increased toward the downstream side in the rotation direction. That is, the oil reservoirs 27a and 28a are formed corresponding to the rotation direction K1, and the oil reservoirs 27b and 28b are formed corresponding to the rotation direction K2.
  The principle of vibrating the inner shaft 10 by the interaction of the oil reservoirs 27 and 28 formed in this way will be described with reference to FIG.
  FIG. 4 is an enlarged view of the oil reservoirs 27 and 28 when the second rotating member 26 is rotated in the rotation direction K1.
  FIG. 4A shows the oil reservoirs 27a and 28a when the second rotating member 26 is rotated in the direction of the arrow K1 in the drawing.
  In this case, the oil sump 27a and the oil sump 28a gradually face each other with the rotation of the second rotating member 26 from the sides that are formed most shallowly. Therefore, the lubricating oil stored in the oil reservoir 27a suddenly flows into the oil reservoir 28a due to its rotation (the flow of the lubricating oil is indicated by an arrow M in the figure), and so-called pulsation is generated. As a result, the inner shaft 10 that forms the oil reservoir 28a that receives the sudden inflow of lubricating oil is subject to vibration in the same direction as the rotational direction K1 of the second rotating member 26, indicated by an arrow L1 in the drawing. appear.
  On the other hand, FIG.4 (b) has shown the said oil sumps 27b and 28b about the same case.
  In this case, the oil sump 27b and the oil sump 28b gradually face each other as the second rotating member 26 rotates from the deepest sides. Therefore, the lubricating oil stored in the oil reservoir 27a gently flows into the oil reservoir 28a (the flow of the lubricating oil is indicated by an arrow M in the figure), and does not cause a sudden pressure fluctuation. The vibration with respect to the inner shaft 1 is not generated.
  The case where the inner shaft 10 is rotated in the direction of the arrow K2 in the figure is not particularly shown, but the basic idea is the same as described above, and between the oil reservoir 27b and the oil reservoir 28b. Due to the generated pulsation, the inner shaft 10 is vibrated in the direction indicated by the arrow L2 in the figure.
  Thus, in the bending portion 5 ′, the inner shaft 10 and the second rotating member 26 are pulsated between the oil reservoirs 27 and 28 formed in accordance with the respective rotational directions, The inner shaft 10 can be vibrated in the circumferential direction.
  The direction in which the vibration is generated is determined according to the direction in which the knife is bent, and the vibration in the direction in which the inner shaft 1 collides with the knife pressed against the inner shaft by the movable portion 12 is generated. The rotation direction of the motor M is selected so that That is, the motor M is rotated so as to vibrate the inner shaft 1 in the direction opposite to the rotating direction of the movable portion 12. For example, in FIG. 5, since the movable part 12 is rotated counterclockwise (in the direction indicated by the arrow X1), the inner shaft 10 is caused to vibrate in the clockwise direction with respect to the bent part of the knife. Thus, the inner shaft 10 is caused to collide and the vicinity of the bent portion of the knife 100 is softened.
[0012]
  As described above, the bending portion 5 ′, which is the second embodiment of the bending portion, is cantilevered on the lower frame B2 with respect to the inner shaft 10 that is fixed to the upper frame B1 in a cantilevered manner. In addition to the conventional configuration in which the movable part 12 fixed to the outer surface is externally fitted to fix both of them in a freely rotatable manner, a new configuration has been added in which the inner shaft 10 is vibrated in the circumferential direction. Is.
  Thereby, according to the bending part 5 ′, the movable part 12 is rotated and the knife is pressed to press the side part of the knife against the inner shaft 10 (opening part 11). When the knife is bent, new energy (collision energy, friction energy, or the like) is given to the knife by the vibration of the inner shaft 10 in addition to the pressing force by the movable portion 12. Therefore, it becomes possible to perform bending of the knife with the new energy softened in the vicinity of the bent portion of the knife, and at the same time, it can be bent with a larger maximum processing radius than the conventional apparatus. Therefore, accurate plastic deformation is possible without the influence of viscoelastic properties (springback, etc.).
  In the present embodiment, the motor M is a high-speed rotating motor of 10,000 rpm to 40000 rpm, and the vibration with respect to the inner shaft 10 is set to 10,000 times / minute. However, the setting of this vibration is not limited to this value, and it is desirable to change it according to the material of the knife to be processed or the bending angle. Furthermore, the vibration generated in the inner shaft 10 can be adjusted by changing the quantity of the oil reservoirs 27 and 28 formed in the second rotating member 26 and the recess 10a, and the bending of the knife can be adjusted. The amount of energy applied to the part can be adjusted.
[0013]
  Finally, referring to FIG. 5, the situation of the knife that is bent by the bending portion 5 or 5 ′ will be described.
  FIG. 5 is an enlarged view of a main part of the bending portion 5 or 5 ′ where the knife 100 is bent in the direction of the arrow Y.
  As shown in the figure, the knife 100 transported in the direction of arrow F by the transport section 3 (not shown) is inserted through the opening 11 and the first opening 13 formed in the inner shaft 10. Stopped.
  In this state, the movable portion 12 is rotated (in the direction indicated by the arrow X1 in the drawing), and one edge portion of the first opening 13 in the movable portion 12 is brought into contact with the knife 100. And press with a predetermined pressing force.
  In the case of a conventionally known apparatus, the knife 100 is pushed and bent as it is, but in this embodiment, the inner shaft 10 is vibrated by the vibration mechanism 5a or 5b (not shown) in this state. (In the case of the bending portion 5, the axial direction is perpendicular to the paper surface, and in the case of the bending portion 5 ′, the circumferential direction is the direction opposite to the arrow X 1). Thereby, energy (friction energy or collision energy) generated by the vibration is applied to the vicinity of the bent portion of the knife 100 (indicated by a hatched area I in the drawing), and the portion is softened by the energy.
  Therefore, according to the present embodiment, the knife 100 is pressed by the movable portion 12 and pressed against the inner shaft 10 in a softened state, so that it can be bent with a larger bending radius. Further, by bending in a softened state, even if the bending radius is small, accurate bending (plastic deformation) with less influence of viscoelastic properties (for example, springback) becomes possible.
  By the way, when the bending process is performed on the knife 100, the inner side of the bent portion is contracted by the compressive stress and the outer side is extended by the tensile stress. When the point where the stress (compression stress and tensile stress) is reversed (hereinafter referred to as the stress reversal point) is on the blade surface 100a of the knife 100, the knife 100 is bent into a predetermined shape, The blade surface 100a can also be bent into a predetermined shape. However, in reality, it is known that the stress reversal point is not on the blade surface 100a but inside the blade surface 100a. Therefore, even if the knife 100 is processed into a predetermined shape, the blade surface 100a is bent so as to fall (escape) outward (indicated by an arrow G in the figure) (an example is indicated by an imaginary line H in the figure). In some cases, a predetermined shape was not drawn. Such a situation is likely to occur particularly when the knife 100 is bent with a large bending radius at one time (so-called once bending).
  However, according to the present embodiment provided with the vibration mechanism, since the inside of the bent portion of the knife 100 is softened and bent, it is as if the inner surface of the knife 100 is cut. The same effect can be obtained, and the stress reversal point by the bending can be brought near the blade surface 100a.
  Therefore, according to the present embodiment, in addition to enabling accurate bending (plastic deformation) with less influence of viscoelastic properties by bending in a state softened by vibration, the blade surface 100a Can be prevented, the working efficiency can be remarkably improved, and an apparatus capable of realizing the highly accurate bending work required in recent years can be realized.
[0014]
  As described above, in the present invention, bending at a larger angle than before can be achieved by a single bending process. However, when it is desired to give the knife a greater angle of bending, the bending process may be repeated while feeding out the knife, as in the known apparatus.
  Further, the vibration by the vibration mechanisms 5a and 5b need not always be generated while the knife is bent by the pressing force (action) of the movable part 12, and the bending is performed with the vibration stopped. Is also possible. In other words, the time for applying vibration may be determined according to the material of the knife to be processed or the desired angle (shape).
[0015]
【Example】
  In the embodiment described above, the knife is held by the inner shaft 10, the inner shaft 10 is vibrated, and energy is applied by pressing the knife with the movable portion 12 rotating around the inner shaft 10. However, the structure of the holding part for holding the knife does not have to be a shaft structure as in the above-described embodiment, and the movable part also has a periphery of the holding part. It does not have to rotate in the direction.
  For example, as shown in FIG. 7, a slit 90a (opening) through which the knife 100 passes is formed in a holding part 90 having a round shape or a square axis shape (shown in the drawing). The knife 100 to be fed is passed through the slit 90a, and the knife 100 coming out of the slit 90a is pressed by a pressing portion 91 (corresponding to an example of a movable portion) while vibrating the holding portion 90. Also good. (The knife 100 before being bent is indicated by a broken line, and the knife 100 after being bent is indicated by a solid line.)
  The pressing direction of the pressing portion 91 (the direction indicated by the arrow X in the figure) is a linear motion even if it rotates around the holding portion 91 as in the above-described embodiment. Alternatively, the direction may be in any other direction, that is, any direction in which the knife 100 is bent. At this time, the vibration direction of the holding portion 90 is a vertical axis direction (direction indicated by an arrow C in the drawing) parallel to the knife surface and perpendicular to the knife longitudinal direction as in the above embodiment. A direction (a direction indicated by an arrow L in the drawing) included in a plane orthogonal to the vertical axis direction may be used.
[0016]
  In the above-described embodiment, an electric motor such as a motor is used as a drive source. However, instead of the electric motor, an ultrasonic oscillator (vibrator) that can directly generate ultrasonic vibration or an air-driven rotary is used. A mode using a driving source of a system may be used.
[0017]
【The invention's effect】
  As described above, according to the present invention, the inner shaft in which the opening for inserting the long thin plate-like knife is formed, and the movable portion that moves in the circumferential direction of the inner shaft in the vicinity of the opening. A knife bending apparatus for bending the knife by pressing the knife with the movable part while holding the knife on the inner shaft, and pressing the side of the knife against the opening. In addition to the pressing force by the movable part, new energy (collision energy or friction energy) by vibration of the inner shaft is applied to the knife pressed by the movable part and in contact with the inner shaft, The new energy can be pushed and bent in the state where the vicinity of the bent portion of the knife is softened. Therefore, it is possible to realize a larger maximum machining radius as compared with the conventional apparatus. Furthermore, the bending portion of the knife is pushed and bent while being softened, thereby enabling more reliable plastic deformation. Even when the bending radius is small, the effect of the viscoelastic properties (springback, etc.) of the knife is small. High-precision bending can be realized.
[Brief description of the drawings]
FIG. 1 is a diagram showing an entire knife bending apparatus according to an embodiment of the present invention.
FIG. 2 is a front sectional view and an enlarged view of a main part of a first embodiment of a bending portion.
FIG. 3 is a front sectional view and an enlarged view of a main part of a second embodiment of a bending portion.
FIG. 4 is a diagram for explaining vibration in the circumferential direction of an inner shaft in a bending portion.
FIG. 5 is a diagram illustrating a state of a knife during bending.
FIG. 6 is a perspective view and a cross-sectional view of a main part of a conventional knife bending apparatus.
FIG. 7 is a view showing another embodiment of the bending portion.
[Explanation of symbols]
A ... Knife bending machine
B ... Mount
B1 ...
B2 ... Understand
M: Motor
1 ... knife stock
2 ... Bending straightening part
3 ... Knife conveyor
4 Pre-processing unit
5 ... Bending part
5a: Excitation mechanism
5b: Excitation mechanism
6 ... Cutting part
7: Display section
8 ... Operation part
10 ... Inner shaft
10 '... Disc-shaped edge
10a ... recess
11 ... opening
12 ... Movable part
13 ... 1st opening part
14 ... 2nd opening part
19 ... Compression spring
20 ... 1st rotation member
20 '... Notch
21 ... Steel balls
21 '... fixing hole
22 ... Locating pin
22 '... hole
23 ... Fixing screw
24… Plate
25 ... Spacer
26: Second rotating member
27 ... Oil sump
28 ... Oil sump
30 ... Bearing
90 ... holding part
91 ... Pushing part (movable part)
92 ... Conveying roller
93 ... Conveying roller
100 ... knife
100a ... Blade face

Claims (6)

In a knife bending apparatus that pushes and bends the knife by pressing the movable part against the knife while holding the long thin plate-like knife by the holding part,
And a vibration mechanism that vibrates the holding portion when the movable portion is applied to the knife. The vibration direction of the vibration mechanism is a vertical axis direction parallel to the knife surface and perpendicular to the knife longitudinal direction. knife bending device, characterized in that there. A state in which an inner shaft formed with an opening through which a long thin plate-like knife is inserted and a movable portion that moves in the vicinity of the opening in the circumferential direction of the inner shaft, the knife being held by the inner shaft In a knife bending apparatus that presses and bends the knife by pressing the movable portion with the movable portion and pressing the side of the knife against the opening,
A knife bending process comprising a vibration mechanism that vibrates the inner shaft when the movable part is applied to the knife, and the vibration direction of the vibration mechanism is the axial direction of the inner shaft. apparatus. The excitation mechanism is
An electric motor provided in the vicinity of the end of the inner shaft, and a columnar first rotating member that is rotated by the electric motor and has a predetermined slope formed on the bottom surface thereof, the first rotating member, The knife bending apparatus according to claim 2 , wherein the knife is configured to rotate in a state where the predetermined slope is in contact with an edge of the inner shaft . The knife bending process according to claim 3 , wherein the cylindrical first rotating member is formed with a notch capable of elastically displacing the first rotating member in the axial direction of the inner shaft. apparatus. A state in which an inner shaft formed with an opening through which a long thin plate-like knife is inserted and a movable portion that moves in the vicinity of the opening in the circumferential direction of the inner shaft, the knife being held by the inner shaft In a knife bending apparatus that presses and bends the knife by pressing the movable portion with the movable portion and pressing the side of the knife against the opening,
A knife bending process comprising a vibration mechanism that vibrates the inner shaft when the movable portion is applied to the knife, and a vibration direction by the vibration mechanism is a circumferential direction of the inner shaft. apparatus. The excitation mechanism is
An electric motor provided near the end of the inner shaft; a second rotating member having a cylindrical shape that is rotated by the electric motor and has an oil reservoir for containing lubricating oil formed on a peripheral surface thereof; and an edge of the inner shaft And a recess having an oil reservoir for containing lubricating oil formed on its wall surface, the second rotating member being configured to rotate while being pivotally attached to the recess. The knife bending apparatus according to claim 5 .

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