JP2015000430A - Caulking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caulking device with a simplified device configuration.SOLUTION: A caulking device 1 comprises a work-piece holder unit 24, an upper pushing block 6 having an upper recessed wall surface 6c, an upper punch holder 8, upper caulking punches 9b, and a hydraulic driving unit 4. The upper punch holder 8 has an outer wall surface 8c and an inner wall surface 8b, and a plurality of the upper caulking punches 9b are aligned radially so as to expand from the side of the inner wall surface 8b toward the side of the outer wall surface 8c and so retained that each of the upper caulking punches 9b can move in a radial direction. The upper caulking punches 9b retained by the upper punch holder 8 respectively have a roller 93 projecting from the outer wall surface 8c so as to be able to come in contact with the upper recessed wall surface 6c and are so constituted as to be able to move in a radial direction in order to approach a work-piece W when the upper pushing block 6 makes a downward movement in order to approach the upper punch holder 8 by means of a movement mechanism under the condition that the roller 93 keeps a contact with the upper recessed wall surface 6c.

Description

  The present invention relates to a caulking device, and more particularly to a caulking device for caulking a cylindrical caulking member to an internal member.

  For example, when caulking a cylindrical caulking member such as a hose fitting or an outer peripheral portion of a clevis to an inner member thereof, a plurality of caulking punches are caulked along the circumferential direction of the outer circumferential surface of the cylindrical caulking member Then, a pressing force is applied from the caulking punch to the outer peripheral surface. By pressurizing the outer circumferential surface, the outer circumferential surface bites into the internal member, and the caulking member is caulked. Patent Document 1 discloses four caulking punches arranged radially so as to surround the outer periphery of a cylindrical caulking member, and a hydraulic cylinder that applies an oil pressure to each caulking punch so that each caulking punch faces the axis of the caulking member. A caulking device comprising: By operating the caulking punch from a plurality of directions (four directions), the caulking member is caulked with an equal force along the circumferential direction.

JP 2005-186157 A

(Problems to be solved by the invention)
According to the caulking device described in Patent Document 1, since the caulking punches that operate along a plurality of directions are driven independently, the device configuration becomes complicated. In addition, since a plurality of hydraulic cylinders provided in each caulking punch must be controlled, the control configuration is complicated. In addition, in order to make the caulking depth uniform in all the caulking portions, it is necessary to adjust the hydraulic cylinders that operate the individual caulking punches. As a result, quality control regarding the caulking depth is troublesome. Furthermore, since a plurality of hydraulic cylinders (drive sources) are used, the manufacturing cost of the device is high.

  An object of this invention is to provide the crimping apparatus which can eliminate the above-mentioned problem.

(Means for solving the problem)
The present invention relates to a holding member for holding a caulking member so that the axial direction of the cylindrical caulking member is along the first direction, and a holding member having a semicircular arc in cross-sectional shape perpendicular to the first direction. And has a concave wall surface facing the outer peripheral surface side of the caulking member held by the holding member, and is spaced apart from the caulking member held by the holding member in a second direction perpendicular to the first direction. A punch holder disposed at a position between the push block, the concave wall surface and the caulking member held by the holding member, a plurality of caulking punches held by the punch holder, and between the concave wall surface and the punch holder The punch holder has an outer wall surface facing the concave wall surface side and an inner wall surface facing the outer peripheral side of the caulking member held by the holding member. Have multiple caulking bread with A plurality of crimping punches are held in the punch holder so that each of the crimping punches is radially arranged so as to spread from the inner wall surface side toward the outer wall surface side and each radially arranged crimping punch is movable in the radial direction. The plurality of held crimping punches have a protruding portion protruding from the outer wall surface of the punch holder so as to be able to contact the concave wall surface, and the relative distance is shortened by the distance changing means while the protruding portion is in contact with the concave wall surface. Accordingly, a caulking device configured to be movable in a radial direction so as to approach the caulking member held by the holding portion is provided.

  According to the present invention, when the relative distance along the second direction between the semicircular arc-shaped concave wall surface of the push block and the punch holder is shortened by the distance changing means, the concave wall surface is held by the punch holder. The protrusions of the plurality of movable side crimping punches are in contact with each other. When the relative distance is further shortened in this state, a plurality of caulking punches are pushed against the concave wall surface. In this case, since the plurality of crimping punches are arranged radially and are held by the punch holder so as to be movable in the radial direction, the plurality of crimping punches pressed against the concave wall surface respectively protrude from the inner wall surface of the punch holder. Then, it moves in the radial direction so as to approach the caulking member held by the holding member. Therefore, by holding the caulking member with the holding member so that the axial center position of the cylindrical caulking member coincides with the intersection position of the movement axes of the plurality of caulking punches, the plurality of caulking punches add the outer periphery of the caulking member Press. As a result, the caulking member is caulked.

  Thus, only by shortening the relative distance along the second direction between the concave wall surface and the punch holder, the plurality of radially arranged caulking punches move in the radial direction and the caulking member is moved along the circumferential direction. Caulking. That is, only by changing the relative distance between the concave wall surface and the punch holder in one direction (second direction), the plurality of caulking punches move in different directions, and the caulking member moves along the circumferential direction. It is squeezed. Therefore, it is not necessary to independently drive the caulking punches in different directions as in the conventional case, and the apparatus configuration is simplified.

  Further, the present invention provides a holding member that holds the caulking member so that the axial direction of the cylindrical caulking member is along the first direction, and a cross-sectional shape perpendicular to the first direction is a semicircular arc shape; When the outer circumferential surface of the caulking member held by the holding member is divided into one half circumferential surface and the other half circumferential surface, it has a movable concave wall surface facing one half circumferential surface side, and is held by the holding member Position between the movable side pushing block that is spaced apart in the second direction perpendicular to the first direction with respect to the caulking member, and the caulking member held by the movable concave wall surface and the holding portion A movable side punch holder, a plurality of movable side crimping punches held by the movable side punch holder, and a moving mechanism for moving the movable side push block along the second direction. The punch holder consists of an outer wall surface and a movable concave wall surface. And having an inner wall surface facing one half circumferential surface side of the caulking member held by the holding portion, and a plurality of movable-side caulking punches arranged radially to extend from the inner wall surface side toward the outer wall surface side, and A plurality of movable side crimping punches are held so that each movable side crimping punch arranged radially can be moved in the radial direction, and the plurality of movable side crimping punches held by the movable side punch holder are movable side concave wall surfaces. The movable side push block comes close to the movable side punch holder by the moving mechanism in a state where the protruding portion is in contact with the movable side concave wall surface. The caulking device is configured to be movable in the radial direction so as to approach the caulking member held by the holding portion as it moves in the second direction. That.

  In this case, the movable-side push block has an axis center of the caulking member in which the movement axis of the center of curvature (arc center) of the movable-side concave wall surface is held by the holding member in a plane perpendicular to the first direction. It may be moved in the second direction to pass through.

  According to the present invention, when the movable side pushing block moves in the second direction so as to approach the movable side punch holder, the movable side concave wall surface provided in the movable side pushing block is held by the movable side punch holder. The protrusions of the plurality of movable side crimping punches are in contact with each other. In this state, when the movable side pushing block further moves in the second direction so as to approach the movable side punch holder, the plurality of movable side crimping punches held by the movable side punch holder are pushed against the movable side concave wall surface. In this case, since the plurality of movable side crimping punches are arranged radially and are held by the movable side punch holder so as to be movable in the radial direction, the plurality of movable side crimping punches pressed against the movable side concave wall surface are Each protrudes from the inner wall surface of the movable punch holder and moves in the radial direction so as to approach one half of the outer periphery of the caulking member held by the holding member. Therefore, by holding the crimping member with the holding member so that the axial center position of the cylindrical crimping member coincides with the intersection position of the movement axis lines of the plurality of movable crimping punches, the plurality of movable crimping punches are the crimping member. Pressurize the outer periphery of the. As a result, the caulking member is caulked.

  As described above, only by moving the movable side pushing block in the second direction, the plurality of movable side crimping punches arranged radially move in the radial direction and caulk the member to be crimped along the circumferential direction. That is, a plurality of movable side crimping punches move in different directions by movement of one member (movable side push block) in one direction (second direction), so that the crimped member is aligned along the circumferential direction. It is squeezed. Therefore, it is not necessary to independently drive the caulking punches in different directions as in the conventional case, and the apparatus configuration is simplified. In addition, since the drive source of each movable caulking punch is the same, the control configuration is simplified. Furthermore, since the plurality of movable side crimping punches are moved simultaneously by the movement of one member (movable side pushing block), the crimping depth of each crimping portion can be easily and uniformly adjusted. Furthermore, since only one drive source is used, the manufacturing cost of the apparatus can be reduced. In addition, since the plurality of movable side crimping punches are configured to move in the radial direction by being pushed by the movable side concave wall surface with the radius of curvature formed in the movable side pushing block, the plurality of movable side crimping punches are configured. By making the shapes (dimensions) of the same, the amount of movement of each movable side crimping punch can be made constant.

  In the above invention, the “cylindrical member to be crimped” means a member to be crimped having a cylindrical portion. Therefore, even if all the parts are not cylindrical, if they are partially cylindrical, they are included in the “cylindrical caulking member”. In addition, “semi-arc” means an angle formed by a line segment that has a portion with a constant radius of curvature and that connects one end portion and the center of curvature and a line segment that connects the other end portion and the center of curvature. Refers to an arc of 180 ° or less. Therefore, even if a distorted portion is formed in the middle, if it has a portion with a constant radius of curvature, it is said to be “semi-arc”. In addition, “radial” means that it spreads in the radial direction around a certain point, and “radial direction” means that one point along the radial direction or away from the center around one point. Indicates the direction approaching.

  Further, the caulking device according to the present invention has a fixed concave shape facing the other semicircular surface side of the outer peripheral surface of the caulking member held by the holding portion, wherein the cross-sectional shape perpendicular to the first direction is a semicircular arc shape. A fixed-side push block having a wall surface, the fixed-side concave wall surface disposed opposite to the movable-side concave wall surface along the second direction across the caulking member held by the holding member, and a fixed-side concave wall surface; A fixed-side punch holder disposed at a position between the holding member held by the holding member and movable in the second direction; and a plurality of fixed sides held by the fixed-side punch holder It is good to provide a caulking punch. The fixed side punch holder has an outer wall surface facing the fixed concave wall surface side and an inner wall surface facing the other half circumferential surface side of the caulking member held by the holding member, and a plurality of fixed side caulking punches are provided inside. A plurality of fixed-side caulking punches are held so that each fixed-side caulking punch radially arranged so as to expand from the wall surface side toward the outer wall surface side is movable in the radial direction. Good. The holding member may be configured to be movable in the second direction together with the fixed side punch holder. The plurality of fixed-side caulking punches held by the fixed-side punch holder have protrusions that protrude from the outer wall surface of the fixed-side punch holder so that they can contact the fixed-side concave wall surface, and the protrusions are fixed-side concave shapes. As the fixed side punch holder moves in the second direction so as to approach the fixed side push block while being in contact with the wall surface, it is configured to be movable in the radial direction so as to approach the caulking member held by the holding member. Good.

  In this case, the holding member is arranged such that the movement axis in the second direction of the axial center of the caulking member held in the plane perpendicular to the first direction passes through the center of curvature of the fixed concave wall surface. It may be moved in the second direction. The movable side punch holder is configured to be movable in the second direction, and the fixed side punch holder is moved in the second direction so that the movable side punch holder approaches the fixed side punch holder. After the contact, with the movable punch holder in contact with the movable punch holder, the moving speed of the movable side push block is smaller than the moving speed in the second direction toward the movable side punch holder. The movable side push block may be configured to be movable in the same second direction as the moving direction of the movable side push block.

  According to this, when the fixed side punch holder moves in the second direction so as to approach the fixed side concave wall surface of the fixed side pushing block, the fixed side concave wall surface is held by the fixed side punch holder. Contact the protruding part of the caulking punch. In this state, when the fixed side punch holder further moves in the second direction so as to approach the fixed side push block, the plurality of fixed side caulking punches are pressed against the fixed side concave wall surface. In this case, since the plurality of fixed-side crimping punches are arranged radially and are held by the fixed-side punch holder so as to be movable in the radial direction, the plurality of fixed-side crimping punches pressed against the fixed-side concave wall surface are Each tip portion protrudes from the inner wall surface of the fixed punch holder and moves in the radial direction so as to approach the other half circumferential surface of the outer periphery of the caulking member held by the holding member. Therefore, the plurality of fixed-side caulking punches are held by the holding members so that the axial center positions of the cylindrical caulking members coincide with the intersections of the movement axes of the plurality of fixed-side caulking punches. Pressurize the outer periphery of the. As a result, the caulking member is caulked. In this way, the caulking member can be caulked over the entire circumference by the plurality of movable side caulking punches and the plurality of fixed side caulking punches.

It is a front view of the caulking device concerning this embodiment. It is a fragmentary sectional view in the case of seeing the caulking device concerning this embodiment from the side. It is a rear view of the crimping apparatus which concerns on this embodiment. It is a fragmentary sectional view which shows the holding structure of the crimping punch to a punch holder. It is a figure which shows the workpiece | work W hold | maintained at a holder part. It is a figure which shows the crimping apparatus of the state immediately after the lower side punch holder and the upper side punch holder were faced | matched. It is a figure which shows the crimping apparatus in an initial contact state. It is a figure which shows the crimping apparatus in the crimping completion state. It is a fragmentary sectional view showing signs that the upper caulking punch is pushed by the upper concave wall surface and moves in the forward direction. It is a fragmentary sectional view which shows a mode that a lower caulking punch is pushed by the lower concave wall surface, and moves to an advance direction.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a caulking device 1 according to the present embodiment, FIG. 2 is a partial cross-sectional view of the caulking device 1 when viewed from the side, and FIG. Here, in this specification, when the crimping apparatus 1 is seen from the front direction shown in FIG. 1, the left-right direction is defined as the width direction, and the up-down direction is defined as the height direction. In addition, when the caulking device 1 is viewed from the side direction shown in FIG. 2, the left-right direction is defined as the thickness direction, and among the thickness directions, the direction toward the left side in FIG. To do.

  As shown in FIG. 1, the caulking device 1 of the present embodiment includes a lower base plate 2, an upper base plate 3, a hydraulic drive unit 4, a lower push block 5, an upper push block 6, and a lower side. A punch holder 7, an upper punch holder 8, a plurality of lower caulking punches 9 a held by the lower punch holder 7, and a plurality of upper caulking punches 9 b held by the upper punch holder 8 are provided. Furthermore, the crimping apparatus 1 of this embodiment is provided with the work holder unit 24, as shown in FIG.

  The lower base plate 2 has a rectangular shape that is long in the width direction when viewed from the plane direction (upward in FIG. 1). Base shafts 11 and 11 are erected respectively at both ends in the width direction of the lower base plate 2. The lower ends of the base shafts 11 are fixed to the lower base plate 2 with bolts or the like. Accordingly, the base shafts 11 and 11 are extended vertically upward from both ends in the width direction of the lower base plate 2. Further, the upper base plate 3 is formed in the same rectangular shape as the lower base plate 2 when viewed from the plane direction, and is disposed facing the lower base plate 2 above the lower base plate 2. Through holes 3 a and 3 a are formed at both ends in the width direction of the upper base plate 3. Base shafts 11 and 11 are inserted through the through holes 3a and 3a, respectively. The base shafts 11, 11 inserted through the through holes 3 a, 3 a protrude upward from the upper base plate 3. Stopper rings 14 and 14 are fixed to the upper end portion of the base shaft 11 protruding from the upper base plate 3.

  Cylindrical lower stopper shafts 15, 15 extend upward from the upper surface 2 a of the lower base plate 2 so as to cover the outer periphery of the lower portion of the base shafts 11, 11. Further, cylindrical upper stopper shafts 16 and 16 are extended downward from the lower surface 3b of the upper base plate 3 so as to cover the outer periphery of the upper part of the base shafts 11 and 11 through the through holes 3a and 3a. The

  Base springs 12 and 12 are disposed so as to cover the outer periphery of the lower stopper shafts 15 and 15. The lower ends of the base springs 12, 12 are locked to the upper surface 2 a of the lower base plate 2, and the upper ends are locked to ring plates 12 a, 12 a provided on the outer periphery of the upper stopper shafts 16, 16. Therefore, the upper base plate 3 is biased upward with respect to the lower base plate 2 by the elastic force of the base springs 12, 12. The upper base plate 3 receiving the urging force of the base springs 12 and 12 is restricted from moving upward relative to the lower base plate 2 by contacting the lower surface side of the stopper rings 14 and 14. The state in which the upward movement of the upper base plate 3 is restricted, that is, the state shown in FIG. 1 is the initial state (original position state) of the crimping device 1 according to the present embodiment.

  The sum of the lengths of the lower stopper shafts 15 and 15 and the upper stopper shafts 16 and 16 is the length in the height direction of the lower base plate 2 and the upper base plate 3 when the caulking device 1 is in the initial state shown in FIG. Smaller than that. Therefore, in the initial state, a predetermined gap is formed between the upper end of the lower stopper shaft 15 and the lower end of the upper stopper shaft 16. The upper base plate 3 can move downward in the height direction toward the lower base plate 2 against the urging force of the base springs 12, 12 as much as the gap is filled. The downward movement of the upper base plate 3 is restricted by the tip surfaces of the lower stopper shafts 15 and 15 and the tip surfaces of the upper stopper shafts 16 and 16 being brought together.

  The lower push block 5 is fixed to the upper surface 2a of the lower base plate 2, and is erected upward from the upper surface 2a. The lower push block 5 includes a front surface 5b having a notch side 5a formed so as to be depressed downward when viewed from the front, and a lower concave wall surface 5c extending in the thickness direction (rearward) from the notch side 5a. And having a predetermined thickness in the thickness direction so that cross sections perpendicular to the thickness direction have the same shape. The contour shape of the lower concave wall surface 5c viewed from the front direction, that is, the cross-sectional shape of the lower concave wall surface 5c when the lower push block 5 is cut in a plane perpendicular to the thickness direction (first direction), It is a semicircular arc shape recessed downward. Here, in the present embodiment, the “semicircular arc shape” means a line having an arc portion having the same radius of curvature and connecting the center of curvature and one end of the arc and the center of curvature and the other end of the arc. An arc having an angle of 180 ° or less is formed. Therefore, although the concave part 5d is formed in the central part of the lower concave wall surface 5c shown in FIG. 1, even if it has such a part 5d, it is said to be semicircular.

  The upper push block 6 is fixed to the lower surface 3b of the upper base plate 3, and is erected downward from the lower surface 3b. The upper push block 6 has a front surface 6b having a notch side 6a formed so as to be recessed upward as viewed from the front, and an upper concave wall surface 6c extending in the thickness direction (rearward) from the notch side 6a. , And having a predetermined thickness in the thickness direction so that the cross sections perpendicular to the thickness direction have the same shape. The contour shape of the upper concave wall surface 6c viewed from the front direction, that is, the cross-sectional shape of the upper concave wall surface 6c when the upper push block 6 is cut in a plane perpendicular to the thickness direction (first direction) is concave upward. A semicircular arc shape. As shown in FIG. 1, the lower concave wall surface 5c and the upper concave wall surface 6c are arranged facing each other so that the positions in the width direction of the respective centers of curvature (arc centers) coincide. Moreover, the curvature radius of the lower concave wall surface 5c and the curvature radius of the upper concave wall surface 6c are equal.

  When the crimping device 1 is in the initial state, the lower concave wall surface 5c and the upper concave wall surface 6c are arranged apart from each other in the height direction. Therefore, when the crimping device 1 in the initial state is viewed from the front, a space having a substantially elliptical cross section is formed between the lower concave wall surface 5c and the upper concave wall surface 6c. The lower punch holder 7 and the upper punch holder 8 are disposed in the space having a substantially elliptical cross section. Both punch holders 7 and 8 are formed with a predetermined thickness in the thickness direction so that the cross sections perpendicular to the thickness direction have the same shape. In addition, the shape of the upper punch holder 8 rotated by 180 ° when viewed from the front direction matches the shape of the lower punch holder 7 viewed from the front direction.

  The lower punch holder 7 includes a substantially fan-shaped front surface 7a that protrudes downward as viewed from the front direction, an inner wall surface 7b that extends in the thickness direction (rearward) from the inner periphery of the front surface 7a, and an outer periphery of the front surface 7a. An outer wall surface 7c extending in the thickness direction (rear), one end surface 7d connecting one end edge in the width direction of the inner wall surface 7b and one end edge in the width direction of the outer wall surface 7c, and the width direction of the inner wall surface 7b And the other end face 7e connecting the other end edge in the width direction of the outer wall surface 7c. The inner wall surface 7b is formed so as to be depressed downward when viewed from the front direction, and a cross section perpendicular to the thickness direction is a semicircular arc shape. The outer wall surface 7c is configured by connecting four planes so as to be formed in a substantially arc shape when viewed from the front direction. The one end face 7d and the other end face 7e are planes perpendicular to the height direction.

  The upper punch holder 8 is disposed above the lower punch holder 7. The upper punch holder 8 has a substantially fan-shaped front surface 8a that is convex upward as viewed from the front direction, an inner wall surface 8b that extends in the thickness direction (backward) from the inner periphery of the front surface 8a, and a thickness from the outer periphery of the front surface 8a. An outer wall surface 8c extending in the vertical direction (rear), one end surface 8d connecting one end edge in the width direction of the inner wall surface 8b and one end edge in the width direction of the outer wall surface 8c, and in the width direction of the inner wall surface 8b. It has the other end surface 8e which connects the other end edge and the other end edge in the width direction of the outer wall surface 8c. The inner wall surface 8b is formed so as to be recessed upward as viewed from the front direction, and a cross section perpendicular to the thickness direction is a semicircular arc shape. The outer wall surface 8c is configured by connecting four planes so as to be formed in a substantially arc shape when viewed from the front direction. One end face 8d and the other end face 8e are planes perpendicular to the height direction.

  When the crimping apparatus 1 is in the initial state, the lower punch holder 7 and the upper punch holder 8 having the above-described shapes are such that one end surface 7d of the lower punch holder 7 and one end surface 8d of the upper punch holder 8 are in the height direction. And the other end face 7e of the lower punch holder 7 and the other end face 8e of the upper punch holder 8 face each other with a predetermined gap in the height direction. And an upper elliptical space between the upper push block 6. With such an arrangement, an elliptical space is formed between the inner wall surface 7b of the lower punch holder 7 and the inner wall surface 8b of the upper punch holder 8.

  In the lower punch holder 7, four through holes penetrating from the inner wall surface 7b to the outer wall surface 7c are formed at equal intervals along the circumferential direction. Similarly, in the upper punch holder 8, four through holes penetrating from the inner wall surface 8b to the outer wall surface 8c are formed at equal intervals along the circumferential direction. In the present embodiment, the cross-sectional shape of these through holes is circular. The lower caulking punch 9 a is held in the four through holes formed in the lower punch holder 7, and the upper caulking punch 9 b is held in the four through holes formed in the upper punch holder 8. In this specification, when the lower caulking punch 9a and the upper caulking punch 9b are not distinguished from each other, and when the lower caulking punch 9a and the upper caulking punch 9b are collectively referred to, they are simply referred to as “caulking punch 9”.

  FIG. 4 is a partial cross-sectional view showing a holding structure of the caulking punch 9 (upper caulking punch 9b or lower caulking punch 9a) to the upper punch holder 8 (lower punch holder 7). The structure of the lower caulking punch 9a is the same as that of the upper caulking punch 9b, and the holding structure of the lower caulking punch 9a to the lower punch holder 7 is the same as the assembly structure of the upper caulking punch 9b to the upper punch holder 8. is there.

  As shown in FIG. 4, the caulking punch 9 includes a punch main body 91, a hinge pin 92, a roller 93 (protruding portion), a ring plate 94, and a caulking spring 95. The punch body 91 is inserted through a through hole 8f (7f) formed in the upper punch holder 8 (lower punch holder 7). The punch main body 91 includes a columnar base portion 911, a tip end portion 912 that is continuously provided on one end side of the base portion 911, and a roller attachment portion 913 that is continuously provided on the other end side of the base portion 911. The base portion 911 includes a large diameter portion 911a and a small diameter portion 911b provided continuously to the large diameter portion 911a along the axial direction. A tip end portion 912 is connected to the large diameter portion 911a side, and a roller mounting portion 913 is connected to the small diameter portion 911b side. And the front-end | tip part 912 protrudes from the inner wall surface 8b (7b) of the upper punch holder 8 (lower punch holder 7), and the roller attachment part 913 is the outer wall surface 8c (7c) of the upper punch holder 8 (lower punch holder 7). The punch body 91 is disposed in the through hole 8f (7f) so as to project from the through hole 8f. The tip member 912 presses the member to be crimped, and the member to be crimped is caulked.

  The small diameter portion 911b has a smaller diameter than the large diameter portion 911a and is provided concentrically with the large diameter portion 911a. Therefore, a ring-shaped step surface 911c is formed at the boundary between the large diameter portion 911a and the small diameter portion 911b. The diameter of the large diameter portion 911a is substantially equal to the diameter of the through hole 8f (7f). Therefore, when the punch body 91 is inserted into the through hole 8f (7f), the outer peripheral surface of the large diameter portion 911a is in sliding contact with the inner peripheral surface forming the through hole 8f (7f). Accordingly, the crimping punch 9 is movable in the axial direction of the base portion 911 while being guided by the inner wall surface forming the through hole 8f (7f) of the upper punch holder 8 (lower punch holder 7). Here, in the axial direction of the base portion 911, a direction from the large diameter portion 911a to the tip portion 912 is referred to as a forward direction, and a direction from the large diameter portion 911a to the small diameter portion 911b is referred to as a backward direction. Accordingly, the caulking punch 9 is held by the upper punch holder 8 (lower punch holder 7) so as to be movable in the forward and backward directions.

  A fixing bracket 96 is disposed on the outer wall surface 8c (7c) of the upper punch holder 8 (lower punch holder 7). The fixing bracket 96 is formed with a circular hole 961 having a diameter larger than the diameter of the small diameter portion 911b of the base portion 911 of the punch body 91 and smaller than the diameter of the large diameter portion 911a. The fixing bracket 96 is disposed on the outer wall surface 8c (7c) so that the peripheral portion 962 of the circular hole 961 is hooked to the opening portion of the through hole 8f (7f) to the outer wall surface 8c (7c). The fixing bracket 96 is fixed to the outer wall surface 8c (7c) by a fastening member such as. The peripheral portion 962 of the circular hole 961 of the fixing bracket 96 fixed to the outer wall surface 8c (7c) protrudes inward from the opening edge of the through hole 8f (7f) as shown in FIG. The small-diameter portion 911 b is inserted into the circular hole 961 of the fixed bracket 96 in a state where the large-diameter portion 911 a of the base portion 911 of the punch body 91 is inserted into the through-hole 8 f (7 f). Therefore, when the stepped surface 911c of the base portion 911 is engaged with the peripheral edge portion 962 of the fixed bracket 96, the movement of the punch body 91 in the reverse direction in the through hole 8f (7f) is restricted, and the outer wall surface The punch body 91 is prevented from falling off from the 8c (7c) side.

  When the crimping device 1 is in the initial state, the small diameter portion 911b of the base portion 911 protrudes outward from the outer wall surface 8c (7c) of the upper punch holder 8 (lower punch holder 7) as shown in FIG. Further, the ring plate 94 is fixed to the outer periphery of a predetermined position on the rear end side (projection end side) of the small diameter portion 911b protruding from the through hole 8f (7f). A spring 95 is disposed between the fixed bracket 96 and the ring plate 94. The spring 95 always generates an extension force. The extension force of the spring 95 is transmitted to the punch body 91 through the ring plate 94. For this reason, the punch body 91 is biased in the backward direction by the spring 95. However, when the step surface 911c of the base portion 911 is engaged with the peripheral portion 962 of the fixed bracket 96 as described above, the movement of the punch body 91 in the backward direction is restricted. Therefore, the punch main body 91 maintains the initial state shown in FIG. 4 while receiving the urging force in the backward direction from the caulking spring 95.

  As shown in FIG. 2, the roller mounting portion 913 has a pair of arms extending in parallel from the base portion 911 in a bifurcated manner. The caulking punch 9 is held by the punch holder (7, 8) so that the pair of arms are arranged in the thickness direction of the caulking device 1. The pair of arms are formed with through holes having the same axial center along the thickness direction. One hinge pin 92 is inserted into these through holes. A roller 93 is rotatably mounted around the hinge pin 92 and between the pair of arms. Accordingly, the roller 93 is attached to the roller attachment portion 913 so as to be rotatable about the axis of the hinge pin 92, that is, about the axis along the thickness direction. 2, the roller 93 of the upper caulking punch 9b faces the upper concave wall surface 6c of the upper push block 6, and the roller 93 of the lower caulking punch 9a faces the lower concave wall surface 5c of the lower push block 5. Face to face.

  As shown in FIG. 2, the lower punch holder 7 includes a holding portion 71 that forms a portion that holds the lower caulking punch 9 a and a connection portion 72 that forms a portion extending rearward from the holding portion 71. Similarly, the upper punch holder 8 has a holding portion 81 that forms a portion that holds the upper caulking punch 9 b and a connection portion 82 that forms a portion extending rearward from the holding portion 81. As shown in FIG. 3, the connecting portion 72 of the lower punch holder 7 is formed long in the width direction, and through holes 72a and 72a penetrating in the height direction are formed at both ends in the width direction. A pair of lower holding shafts 17 and 17 erected from the upper surface 2a of the lower base plate 2 are inserted into the through holes 72a and 72a. Therefore, the lower punch holder 7 is configured to be movable in the height direction along the lower holding shafts 17 and 17. Further, the lower holding springs 18, 18 are interposed between the upper surface 2 a of the lower base plate 2 and the lower surface of the connecting portion 72 of the lower punch holder 7 so as to surround the outer periphery of the pair of lower holding shafts 17, 17. The lower punch holder 7 receives an urging force directed upward in FIG. 3 by the lower holding springs 18, 18. Further, ring-shaped stopper plates 19 and 19 are fixed to the upper ends of the lower holding shafts 17 and 17. When the crimping device 1 is in the initial state, the upper movement of the lower punch holder 7 is restricted by the upper surface of the connecting portion 72 of the lower punch holder 7 engaging the stopper plates 19 and 19. For this reason, when the crimping apparatus 1 is in the initial state, the position in the height direction of the lower punch holder 7 is set to the position shown in FIGS.

  Similarly to the connection portion 72 of the lower punch holder 7, the connection portion 82 of the upper punch holder 8 is formed long in the width direction as shown in FIG. 3, and a through-hole penetrating in the height direction at both ends in the width direction 82a and 82a are formed. A pair of upper holding shafts 20, 20 erected from the lower surface 3 b of the upper base plate 3 are inserted into the through holes 82 a, 82 a. Upper holding springs 21, 21 are interposed between the lower surface 3 b of the upper base plate 3 and the upper surface of the connecting portion 82 of the upper punch holder 8 so as to surround the outer peripheries of the pair of upper holding shafts 20, 20. Therefore, the upper punch holder 8 receives a biasing force directed downward in FIG. 3 by the upper holding springs 21 and 21. Further, ring-shaped stopper plates 22 and 22 are fixed to the lower end portions of the upper holding shafts 20 and 20. When the lower surface of the connecting portion 82 of the upper punch holder 8 is engaged with the stopper plates 22, 22, the downward movement of the upper punch holder 8 is restricted. Therefore, the upper punch holder 8 is suspended by the upper holding shafts 20 and 20, and when the caulking device 1 is in the initial state, the height direction position thereof is set to the position shown in FIGS. .

  As shown in FIG. 3, the support plate 23 is attached by fastening means such as a bolt in the vicinity of the center portion in the width direction of the lower surface of the connection portion 72 of the lower punch holder 7. As shown in FIG. 2, the support plate 23 is fixed to the connecting portion 72 of the lower punch holder 7, and extends forward from the fixing portion 23a beyond the lower push block 5. And a connecting portion 23b. A work holder unit 24 for holding the work W is attached to the connecting portion 23 b of the support plate 23. The work holder unit 24 is omitted in FIG.

  As shown in FIG. 2, the work holder unit 24 includes a fixing member 241, a clamp member 242, and a spring 243. The fixing member 241 has a connection part 241a and a standing pillar part 241b. The connection part 241a is connected to the upper surface of the connection part 23b of the support plate 23 by fastening means such as bolts. The upright column portion 241b is erected upward from the connection portion 241a. A through hole 241c penetrating along the thickness direction is formed at the upper end of the upright column portion 241b.

  The clamp member 242 has a rod portion 242a and a holder portion 242b. The rod portion 242a has a cylindrical shape, and is disposed along the thickness direction while being inserted into the through hole 241c of the upright column portion 241b. A holder portion 242b is provided at the rear end portion (the right end portion in FIG. 2) of the rod portion 242a. The holder portion 242b is formed with a bottomed concave portion 242c that opens rearward (to the right in FIG. 2), and the workpiece W is held in the concave portion 242c.

  The outer diameter of the holder part 242b is larger than the outer diameter of the rod part 242a. And the spring 243 is provided between the holder part 242b and the rod part 242a so that the part which protruded from the through-hole 241c to the right side of FIG. 2 among the outer periphery of the rod part 242a may be surrounded. The spring 243 exhibits an extension force. Therefore, the holder portion 242b is urged rearward (rightward in FIG. 2) by the spring 243.

  Since the work holder unit 24 is fixed to the lower punch holder 7 via the support plate 23, the relative position between the lower punch holder 7 and the work holder unit 24 does not change. That is, the work holder unit 24 is configured to be movable together with the lower punch holder 7.

  5A and 5B are views showing the workpiece W held by the holder portion 242b, in which FIG. 5A is a front view and FIG. 5B is a view in the direction of arrow A in FIG. 5A. In the present embodiment, the workpiece W is a clevis. As shown in FIG. 5, the workpiece W includes a first crimping member W1 and a second crimping member W2. The first caulking member W1 includes a columnar base portion B1 and two arm portions B2 and B2 extending in parallel from one end face of the base portion B1. The second caulking member W2 has a cylindrical outer peripheral portion C1 formed so as to cover the base portion B1, and a protrusion C2 protruding from the bottom surface of the outer peripheral portion C1. The outer peripheral portion C1 is caulked to the base portion B1 at a plurality of locations indicated by a portion P in FIG. The portion P is provided along the circumferential direction on the outer peripheral side surface of the outer peripheral portion C1. Accordingly, the first caulking member W1 and the second caulking member W2 are joined by caulking the outer peripheral portion C1 at a plurality of locations from the circumferential direction.

  The protrusion C2 of the workpiece W as shown in FIG. 5 is held in the recess 242c of the holder portion 242b of the workpiece holder unit 24 as shown in FIG. As can be seen from FIG. 2, the positioning block 25 is fixed to the upper surface of the connection portion 72 of the lower punch holder 7. A tip portion of the workpiece W (tip of the arm portion B2) held by the holder portion 242b of the workpiece holder unit 24 is abutted against the positioning block 25. Here, as described above, the holder portion 242b is urged rearward (rightward in FIG. 2) by the spring 243. Therefore, the workpiece W receives an urging force from the spring 243 in a state of being abutted against the positioning block 25. When the work W (arm portion B2) is engaged with the positioning block 25 by such an urging force, the work W is held at the initial position shown in FIG. As shown in FIG. 1, the initial position of the workpiece W viewed from the front direction is located in an elliptical space between the inner wall surface 7 b of the lower punch holder 7 and the inner wall surface 8 b of the upper punch holder 8.

  As shown in FIG. 1, a plurality (four) of lower caulking punches 9 a held by the lower punch holder 7 expand from the inner wall surface 7 b side to the outer wall surface 7 c side of the lower punch holder 7. Arranged radially. The lower punch holder 7 is equally spaced in the circumferential direction so as to be movable in a radial direction (radial direction) along the axial direction of the through-hole 7f, that is, to be movable forward and backward. Be placed. The positions of the lower caulking punches 9a in the thickness direction are the same. Accordingly, the axes representing the moving direction of the lower caulking punch 9a intersect at one point. That is, the four lower caulking punches 9a are held by the lower punch holder 7 so as to be able to advance toward the same point. Hereinafter, the intersection of the movement axes in the forward direction of the four lower caulking punches 9a is referred to as a lower intersection.

  Similarly, the plural (four) upper caulking punches 9b held by the upper punch holder 8 are arranged radially so as to expand from the inner wall surface 8b of the upper punch holder 8 toward the outer wall surface 8c. And it arrange | positions at equal intervals in the circumferential direction of the upper punch holder 8 so that it can move to radial direction along the axial direction of the through-hole 8f, ie, it can move forward and backward. Further, the positions of the upper caulking punches 9b in the thickness direction coincide with each other. Therefore, the axes representing the moving direction of the upper caulking punch 9b intersect at one point. That is, the four upper caulking punches 9b are held by the upper punch holder 8 so as to be able to advance toward the same point. Hereinafter, an intersection of movement axes in the forward direction of the four upper caulking punches 9b is referred to as an upper intersection.

  When the crimping device 1 is in the initial state, the upper intersection is located above the lower intersection, and the width direction position and the thickness direction position of the upper intersection and the lower intersection coincide. When the crimping device 1 is in the initial state, the height position of the upper intersection is located above the axis position of the workpiece W held by the workpiece holder unit 24, and the height position of the lower intersection is the work holder. This coincides with the axial center position of the workpiece W held by the unit 24.

  Further, as can be seen from FIG. 1, a semicircular space in which all the rollers 93 of the lower caulking punch 9 a held by the lower punch holder 7 are surrounded by the lower concave wall surface 5 c of the lower push block 5. The lower caulking punch 9a is disposed with respect to the lower push block 5 so as to fit inside, that is, to face the lower concave wall surface 5c along the height direction. Similarly, the rollers 93 of all upper caulking punches 9b held by the upper punch holder 8 are accommodated in a semicircular space surrounded by the upper concave wall surface 6c of the upper push block 6, that is, in the height direction. The upper caulking punch 9b is disposed with respect to the upper pushing block 6 so as to face the upper concave wall surface 6c.

  As described above, the roller 93 of each lower caulking punch 9 a held by the lower punch holder 7 faces the lower concave wall surface 5 c of the lower push block 5. At this time, each lower caulking punch 9a is disposed in the caulking device 1 so that the rotation axis direction of the roller 93 coincides with the thickness direction. Therefore, when the lower punch holder 7 approaches the lower push block 5, the rollers 93 of the lower caulking punches 9 a held by the lower punch holder 7 cause the lower concave wall surface 5 c of the lower push block 5. To touch. And in the state which both contacted, the roller 93 of the lower caulking punch 9a can roll on the lower concave wall surface 5c within the plane perpendicular | vertical to a thickness direction.

  Similarly, the roller 93 of each upper caulking punch 9b held by the upper punch holder 8 faces the upper concave wall surface 6c of the upper push block 6. At this time, each upper caulking punch 9b is disposed in the caulking device 1 so that the rotation axis direction of the roller 93 coincides with the thickness direction. Therefore, when the upper push block 6 approaches the upper punch holder 8, the roller 93 of each upper caulking punch 9 b held by the upper punch holder 8 comes into contact with the upper concave wall surface 6 c of the upper push block 6. And in the state which both contacted, the roller 93 of the upper caulking punch 9b can roll on the upper concave wall surface 6c within the plane perpendicular | vertical to a thickness direction.

  Further, the shapes of the four lower caulking punches 9 a held by the lower punch holder 7 and the shapes of the four upper caulking punches 9 b held by the upper punch holder 8 are all the same. Further, when the caulking device 1 is in the initial state, the curvatures of the arcs passing through the centers of the rollers 93 of the four lower caulking punches 9a are constant, and the curvatures of the arcs passing through the centers of the rollers 93 of the four upper caulking punches 9b are It is constant and the curvature of both arcs is the same.

  When the caulking device 1 is in the initial state, the radius of curvature of the arc passing through the centers of the rollers 93 of the four lower caulking punches 9a is slightly larger than the radius of curvature of the lower concave wall surface 5c. For this reason, when the lower punch holder 7 approaches the lower push block 5, the lower concave wall surface 5 c first has two lower sides held on both end sides in the width direction of the lower punch holder 7. It contacts the rollers 93 and 93 of the caulking punches 9a and 9a, and then contacts the rollers 93 and 93 of the remaining two lower caulking punches 9a and 9a.

  Further, the radius of curvature of the arc passing through the centers of the rollers 93 of the four upper caulking punches 9b when the caulking device 1 is in the initial state is slightly larger than the radius of curvature of the upper concave wall surface 6c. For this reason, when the upper push block 6 approaches the upper punch holder 8, the upper concave wall surface 6c is first formed by the two upper caulking punches 9b, 9b held at both ends in the width direction of the upper punch holder 8. It contacts the rollers 93 and 93, and then contacts the rollers 93 and 93 of the remaining two upper caulking punches 9b and 9b.

  The hydraulic drive unit 4 is configured to be able to move the upper base plate 3 in the height direction along the base shafts 11 and 11. Since the specific configuration of the hydraulic drive unit 4 is well known, the description of the specific structure is omitted.

  The operation of the caulking device 1 having the above configuration will be described below. Before the crimping device 1 is operated, the crimping device 1 is in the initial state shown in FIGS. In this initial state, as shown in FIG. 1, the roller 93 of each lower caulking punch 9 a held by the lower punch holder 7 is not in contact with the lower concave wall surface 5 c of the lower push block 5. That is, the lower caulking punches 9a held by the lower punch holder 7 are radially arranged at a predetermined distance upward from the lower concave wall surface 5c of the lower push block 5. Similarly, in the initial state, the roller 93 of each upper caulking punch 9 b held by the upper punch holder 8 is not in contact with the upper concave wall surface 6 c of the upper push block 6. That is, the upper caulking punches 9b held by the upper punch holder 8 are radially arranged at a predetermined distance downward from the upper concave wall surface 6c of the upper push block 6.

  A workpiece W before crimping composed of a first crimping member W1 and a cylindrical second crimping member W2 is set in the crimping device 1 in the initial state. In this case, the protrusion C2 of the second caulking member W2 is held by the holder portion 242b of the work holder unit 24. Further, the position of the workpiece W is determined by the tips of the arm portions B2, B2 of the first caulking member W1 coming into contact with the positioning block 25. Further, the workpiece W is held by the workpiece holder unit 24 so that its axial direction (axial direction of the cylindrical second caulking member W2) is along the thickness direction (first direction).

  Further, as can be seen from FIG. 1, the upper push block 6 and the lower push block 5 are separated from each other in the height direction with respect to the work W (second caulking member W2) held by the work holder unit 24. The upper concave wall surface 6c of the upper push block 6 faces downward so as to face the upper half (upper half circumferential surface) of the outer circumferential surface of the second caulking member W2 of the workpiece W held by the workpiece holder unit 24. The lower concave wall surface 5c of the lower push block 5 faces the lower half (lower half peripheral surface) of the outer peripheral surface of the second caulking member W2 of the work W held by the work holder unit 24. It is formed in a concave shape facing upward. Further, the upper punch holder 8 is positioned along the height direction, and between the workpiece W (second caulking member W2) held by the workpiece holder unit 24 and the upper concave wall surface 6c of the upper push block 6. The lower punch holder 7 is disposed at a position along the height direction, and the work W (second caulking member W2) held by the work holder unit 24 and the lower side of the lower push block 5 It arrange | positions in the position between the concave wall surfaces 5c. Further, the lower concave wall surface 5c is disposed opposite to the upper concave wall surface 6c along the height direction with the work W (second caulking member W2) held by the work holder unit 24 interposed therebetween.

  After the workpiece W is set in the caulking device 1, the hydraulic drive unit 4 is driven. Then, the upper base plate 3 is moved downward in the height direction (second direction) along the base shafts 11 and 11 against the urging force of the base springs 12 and 12 by the driving force of the hydraulic drive unit 4. As the upper base plate 3 moves downward, the upper push block 6 provided on the upper base plate 3 also moves downward. The moving direction (second direction) of the upper push block 6 is a direction toward the work W (second caulking member W2) held by the work holder unit 24, and the thickness direction (first direction). The direction perpendicular to.

  Further, the upper pushing block 6 is in a state in which the position in the width direction of the center of curvature of the upper concave wall surface 6c matches the position in the width direction of the axis of the work W (second caulking member W2) held by the work holder unit 24. Move down. That is, the movement axis of the center of curvature of the upper concave wall surface 6c passes through the axis of the workpiece W held by the workpiece holder unit 24 in the plane perpendicular to the thickness direction (the cylindrical axis of the second caulking member W2). As described above, the upper push block 6 moves downward. As the upper base plate 3 moves downward, the upper holding shaft 20 attached to the upper base plate 3 also moves downward. Due to the downward movement of the upper holding shaft 20, the upper punch holder 8 suspended from the upper holding shaft 20 also moves downward (second direction). As the upper punch holder 8 moves downward, the upper caulking punches 9b held by the upper punch holder 8 also move downward.

  When the upper punch holder 8 moves downward, the upper punch holder 8 approaches the lower punch holder 7, and eventually one end surface 8 d of the upper punch holder 8 is abutted against one end surface 7 d of the lower punch holder 7, and the upper punch holder 8 The other end face 8e of the lower punch holder 7 is abutted against the other end face 7e. FIGS. 6A and 6B are diagrams illustrating the crimping device 1 in a state immediately after the lower punch holder 7 and the upper punch holder 8 are brought into contact with each other. FIG. 6A is a front view and FIG. 6B is a side view. FIG. 6C is a partial sectional view of the case, and FIG. As shown in FIG. 6A, in a state where the lower punch holder 7 and the upper punch holder 8 are in contact with each other, a space having a circular cross section is formed inside these holders 7 and 8. In the state shown in FIG. 6, the lower concave wall surface 5c of the lower push block 5 is not yet in contact with the rollers 93 of the four lower caulking punches 9a, and the upper concave wall surface 6c of the upper push block 6 is It has not yet contacted the rollers 93 of the four upper caulking punches 9b. The state in which the lower punch holder 7 and the upper punch holder 8 are abutted is hereinafter referred to as a butted state.

  Further, in the state shown in FIG. 6, the height positions of the lower intersections of the four lower caulking punches 9 a held by the lower punch holder 7 and the four upper caulking punches 9 b held by the upper punch holder 8. The height of the upper intersection matches. That is, in the butting state, the movement axes of the four lower caulking punches 9a and the four upper caulking punches 9b in the forward direction all intersect at one point. In the abutting state, the axis of the workpiece W (second caulking member W2) held by the workpiece holder unit 24 coincides with this intersection.

  When the upper base plate 3 moves further downward (in the second direction) from the state shown in FIG. 6, the upper push block 6 and the upper holding shafts 20 and 20 fixed to the upper base plate 3 are maintained while the butted state is maintained. Move down. Here, in the butting state, the downward urging force from the upper holding springs 21 and 21 acting on the upper punch holder 8 is transmitted to the lower punch holder 7 via the upper punch holder 8 at the same time. The upward biasing force from the lower holding springs 18, 18 acting on the lower punch holder 7 is also transmitted to the upper punch holder 8 through the lower punch holder 7. That is, the downward biasing force from the upper holding springs 21 and 21 and the upward biasing force from the lower holding springs 18 and 18 simultaneously act on the integrated lower punch holder 7 and upper punch holder 8. . Therefore, when the upper base plate 3 moves downward while maintaining the butted state, both springs contract while the urging force of the lower holding springs 18 and 18 and the urging force of the upper holding springs 21 and 21 are balanced. In the present embodiment, the elastic coefficients of the lower holding springs 18 and 18 and the elastic coefficients of the upper holding springs 21 and 21 are made equal. Therefore, the contraction speed of the lower holding springs 18 and 18 and the contraction speed of the upper holding springs 21 and 21 are equal. That is, the contraction speed of the upper holding springs 21 and 21 is half of the lowering speed of the upper base plate 3. On the other hand, the upper push block 6 moves downward at the same speed as the upper base plate 3. As a result, the lower punch holder 7 and the upper punch holder 8 move downward at half the lowering speed of the upper push block 6 while maintaining the butted state.

  Further, when the lower punch holder 7 moves downward at half the lowering speed of the upper push block 6, the work holder unit 24 connected to the lower punch holder 7 by the support plate 23 is also connected to the lower punch holder. Move down at the same speed as 7. Accordingly, the workpiece W held by the workpiece holder unit 24 also moves downward at the same speed as the lower punch holder 7 and the upper punch holder 8. In this case, the workpiece holder unit 24 moves downward so that the axis of movement of the axis of the workpiece (second caulking member W2) being held passes through the center of curvature of the lower concave wall surface 5c. In this way, the lower punch holder 7, the upper punch holder 8, and the upper intersection, the lower intersection, and the position of the axial center of the work W (second caulking member W <b> 2) are matched. The workpiece W integrally moves downward at half the lowering speed of the upper push block 6.

  As described above, since the lowering speed of the upper punch holder 8 after the abutting state is half of the lowering speed of the upper push block 6, the upper concave wall surface of the upper push block 6 is lowered as the upper push block 6 is lowered. 6c approaches the upper punch holder 8 along the height direction, and the distance (relative distance) in the height direction between the upper concave wall surface 6c and the upper caulking punch 9b is reduced. Therefore, the upper concave wall surface 6c gradually approaches the roller 93 of the upper caulking punch 9b. Further, the lower punch holder 7 is lowered at half the lowering speed of the upper push block 6, whereas the lower push block 5 fixed to the lower base plate 2 is stationary. The lower punch holder 7 that moves downward integrally with the upper punch holder 8 approaches the lower push block 5 along the height direction, and in the height direction between the lower concave wall surface 5c and the lower caulking punch 9a. The distance (relative distance) is reduced. Therefore, the lower concave wall surface 5c gradually approaches the roller 93 of the lower caulking punch 9a.

  Eventually, the roller 93 of the upper caulking punch 9b held by the upper punch holder 8 comes into contact with the upper concave wall surface 6c of the upper push block 6 and simultaneously the lower concave wall surface 5c of the lower push block 5 The roller 93 of the lower caulking punch 9a held by the side punch holder 7 comes into contact. In this case, first, the upper concave wall surface 6c of the upper push block 6 is made up of two upper caulking punches 9b (in FIG. 6A) held on both ends of the upper punch holder 8 in the width direction in FIG. The caulking punches 9b ′ and 9b ′) come into contact with the rollers 93. Similarly, the lower concave wall surface 5c of the lower push block 5 is first formed of two lower caulking punches 9a (FIG. 6 (a) held on both ends of the lower punch holder 7 in the width direction in FIG. ) In contact with the rollers 93 of the lower caulking punches 9a ′, 9a ′). Hereinafter, such a state is referred to as an initial contact state.

  FIG. 7 shows the crimping device 1 in the initial contact state. 7A is a front view of the crimping device 1 in the initial contact state, FIG. 7B is a partial cross-sectional view when viewed from the side, and FIG. 7C is a rear view. In the initial contact state shown in FIG. 7, as described above, the two lower caulking punches 9 a ′ and 9 a ′ held on the both end sides in the width direction of the lower punch holder 7 are below the lower push block 5. It contacts the concave wall surface 5c. Further, the two upper caulking punches 9 b ′ and 9 b ′ held on both ends in the width direction of the upper punch holder 8 come into contact with the upper concave wall surface 6 c of the upper push block 6. When the upper base plate 3 further moves downward from this initial contact state, the lower caulking punches 9a ′ and 9a ′ are pushed by the lower concave wall surface 5c so as to protrude from the inner wall surface 7b of the lower punch holder 7 in the forward direction. While moving, the upper caulking punches 9 b ′ and 9 b ′ are pushed by the upper concave wall surface 6 c and moved in the forward direction (radial direction) so as to protrude from the inner wall surface 8 b of the upper punch holder 8.

  FIG. 9 is a partial cross-sectional view showing a state where the upper caulking punch 9b 'is pushed by the upper concave wall surface 6c and moves in the forward direction. FIG. 9A shows an initial contact state, and FIG. 9B shows a state where the upper caulking punch 9b 'is pushed forward by the upper concave wall surface 6c from the state shown in FIG. 9A. When the upper push block 6 further moves downward relative to the upper punch holder 8 from the initial contact state shown in FIG. 9A, the roller 93 of the upper caulking punch 9b ′ in contact with the upper concave wall surface 6c is moved. Rolls on the upper concave wall surface 6c in the clockwise direction indicated by the arrow A in FIG. As the roller 93 rolls, the contact position between the roller 93 and the upper concave wall surface 6c changes. The distance L1 between the outer wall surface 8c of the upper punch holder 8 and the upper concave wall surface 6c at the contact position becomes shorter as the upper push block 6 moves downward. As the distance L1 is shortened, the roller 93 is pushed by the upper concave wall surface 6c, whereby the upper caulking punch 9b 'moves in the forward direction (radial direction) so as to protrude from the inner wall surface 8b of the upper punch holder 8.

  FIG. 10 is a partial cross-sectional view showing a state where the lower caulking punch 9a 'is pushed by the lower concave wall surface 5c and moves in the forward direction. FIG. 10A shows an initial contact state, and FIG. 10B shows a state in which the lower caulking punch 9a 'is pushed forward by the lower concave wall surface 5c from the state shown in FIG. 10A. When the lower punch holder 7 further moves downward relative to the lower push block 5 from the initial contact state shown in FIG. 10 (a), the lower caulking punch 9a ′ contacting the lower concave wall surface 5c. The roller 93 rolls on the lower concave wall surface 5c in the counterclockwise direction indicated by the arrow B in FIG. As the roller 93 rolls, the contact position between the roller 93 and the lower concave wall surface 5c changes. Further, the distance L2 between the outer wall surface 7c of the lower punch holder 7 and the lower concave wall surface 5c at the contact position becomes shorter as the lower punch holder 7 moves downward. When the roller 93 is pushed by the lower concave wall surface 5c by the distance L2, the lower caulking punch 9a 'moves in the forward direction (radial direction) so as to protrude from the inner wall surface 7b of the lower punch holder 7. To do.

  Thus, the upper caulking punches 9b 'and 9b and the lower caulking punches 9a' and 9a 'move in the forward direction. In this way, the four caulking punches first move forward to position the workpiece W with high accuracy.

  Thereafter, the upper base plate 3 and the upper push block 6 further move downward, and the upper punch holder 8, the lower punch holder 7, and the work holder unit 24 are integrated at a speed half the lowering speed of the upper push block 6. When moving downward, the upper concave wall surface 6 c of the upper push block 6 further approaches the upper punch holder 8, and the lower punch holder 7 further approaches the lower concave wall surface 5 c of the lower push block 5. Eventually, the rollers 93 of the remaining two upper caulking punches 9b held by the upper punch holder 8 also come into contact with the upper concave wall surface 6c, and the remaining two lower caulking punches held by the lower punch holder 7 The roller 93 of 9a also contacts the lower concave wall surface 5c. In this state, when the upper base plate 3 further moves downward and the upper punch holder 8, the lower punch holder 7, and the work holder unit 24 move integrally downward at half the speed, the lower punch holder 7 and the upper punch holder All the caulking punches 9 held at 8 move in the forward direction. Since the state of the forward movement of each crimping punch 9 is the same as that shown in FIGS. 9 and 10, the description thereof is omitted.

  When all the caulking punches 9 move forward, the leading end portion 912 of each caulking punch 9 bites into the outer circumferential surface of the second caulking member W2 (outer circumferential portion C1). As a result, the second caulking member W2 is caulked to the first caulking member W1, and the first caulking member W1 and the second caulking member W2 are joined. FIG. 8 shows the caulking device 1 in a state where caulking is completed (caulking completion state). FIG. 8A is a front view of the caulking device 1 in the caulking completion state, FIG. 8B is a side partial sectional view, and FIG. 8C is a rear view. As shown in FIG. 8, in the caulking completion state, the tip surfaces of the upper stopper shafts 16, 16 attached to the upper base plate 3 are in contact with the tip surfaces of the lower stopper shafts 15, 15 attached to the lower base plate 2. Matched. As a result, further downward movement of the upper base plate 3 is stopped.

  In the caulking completion state, the leading end portions 912 of all the caulking punches 9 bite into the second caulking member W2. In this case, the lower concave wall surface 5c and the upper concave wall surface 6c form a perfect circle when viewed from the front direction shown in FIG. The center position of this perfect circle coincides with the intersection of the movement axis lines of all the caulking punches 9 and the axis of the workpiece W (second caulking member W2). Therefore, when the caulking is completed, the movement amounts of all the caulking punches 9 in the forward direction are the same. Therefore, the caulking depth to the first caulking member W1 by all the caulking punches 9 is the same. As a result, the first caulking member W1 can be caulked to the second caulking member W2 uniformly in the circumferential direction.

  As described above, the crimping device 1 of the present embodiment includes the workpiece holder unit 24 that holds the workpiece W so that the axial direction of the cylindrical second crimping member W2 is along the thickness direction of the crimping device 1, and the thickness. The cross-sectional shape perpendicular to the vertical direction is a semicircular arc and has concave wall surfaces 5c and 6c facing the outer peripheral surface side of the work W (second caulking member W2) held by the work holder unit 24. Pushing blocks 5 and 6 that are spaced apart in the height direction perpendicular to the thickness direction with respect to the workpiece W held by the unit 24, and concave wall surfaces 5c and 6c that are located along the height direction. Punch holders 7 and 8 disposed at a position between the workpiece holder unit 24 and the workpiece W held by the workpiece holder unit 24 (second crimping member W2), and a plurality of crimping punches 9a held by the punch holders 7 and 8, 9b and the height direction Provided along concave walls 5c, the distance changing means for changing the relative distance between the 6c and the punch holder 7 and 8 (hydraulic drive unit 4), a. Further, the punch holders 7 and 8 are the outer wall surfaces 7c and 8c facing the concave wall surfaces 5c and 6c, and the inner wall surface facing the outer peripheral side of the work W (second caulking member W2) held by the work holder unit 24. 7b, 8b, and a plurality of crimping punches 9a, 9b are arranged radially so as to expand from the inner wall surface 7b, 8b side toward the outer wall surface 7c, 8c side, and each crimping punch 9a, The plurality of crimping punches 9a and 9b are held so that 9b can move in the radial direction (forward direction, backward direction). The plurality of crimping punches 9a and 9b held by the punch holders 7 and 8 have rollers 93 protruding from the outer wall surfaces 7c and 8c of the punch holders 7 and 8 so as to be able to contact the concave wall surfaces 5c and 6c. As the relative distance is shortened by the distance changing means while the roller 93 is in contact with the concave wall surfaces 5c, 6c, the workpiece W protrudes from the inner wall surfaces 7b, 8b of the punch holders 7, 8 and is held by the work holder unit 24. It is configured to be movable in the forward direction (radial direction) so as to approach the (second caulking member W2).

  Further, the caulking device 1 of the present embodiment includes a work holder unit 24 that holds the work W so that the axial direction of the cylindrical second caulking member W2 is along the thickness direction of the caulking device 1, and in the thickness direction. A concave upper concave wall surface 6c (movable concave wall surface) having a vertical cross-sectional shape of a semicircular arc and facing the upper half surface of the workpiece W (second caulking member W2) held by the workpiece holder unit 24 is provided. And an upper push block 6 (movable side push) which is spaced apart in the height direction perpendicular to the thickness direction with respect to the work W (second caulking member W2) held by the work holder unit 24. Block) and an upper punch holder 8 (movable punch holder) disposed at a position along the height direction between the upper concave wall surface 6c and the workpiece W held by the workpiece holder unit 24. , Upper punch It includes a plurality of upper crimping punch 9b held in Da 8 (movable crimping punch), a moving mechanism for moving the upper pressing block 6 along the height direction (hydraulic drive unit 4), a. The upper punch holder 8 includes an outer wall surface 8c facing the upper concave wall surface 6c and an inner wall surface 8b facing the upper half circumferential surface side of the workpiece W (second caulking member W2) held by the workpiece holder unit 24. And a plurality of upper caulking punches 9b are arranged radially so as to expand from the inner wall surface 8b side toward the outer wall surface 8c side, and the upper caulking punches 9b arranged radially are arranged in a radial direction (forward direction, backward direction). A plurality of upper caulking punches 9b are held. And the several upper crimping punch 9b hold | maintained at the upper punch holder 8 has the roller 93 protruded from the outer wall surface 8c of the upper punch holder 8 so that it can contact the upper concave wall surface 6c from the height direction side, As the upper pressing block 6 moves downward so as to approach the upper punch holder 8 by the moving mechanism in a state where the roller 93 is in contact with the upper concave wall surface 6c, the roller 93 protrudes from the inner wall surface 8b of the upper punch holder 8 to the work holder unit 24. It is configured to be movable in the forward direction (radial direction) so as to approach the held workpiece W (second caulking member W2).

  Further, in the caulking device 1 of the present embodiment, the cross-sectional shape perpendicular to the thickness direction is a semicircular arc, and the work (second caulking member W2) held by the work holder unit 24 faces the lower half peripheral surface side. The lower concave wall surface 5c (fixed-side concave wall surface) is disposed opposite the upper concave wall surface 6c along the height direction with the workpiece W held by the work holder unit 24 interposed therebetween. The lower push block 5 (fixed push block) is disposed at a position along the height direction between the lower concave wall surface 5c and the work W held by the work holder unit 24. The lower punch holder 7 (fixed side punch holder) configured to be movable in the height direction, and a plurality of lower side crimping punches 9a (fixed side crimping punches) held by the lower side punch holder 7 are provided. The lower punch holder 7 has an outer wall surface 7c facing the lower concave wall surface 5c and an inner wall surface 7b facing the lower half peripheral surface side of the work (second caulking member W2) held by the work holder unit 24. And a plurality of lower caulking punches 9a are radially arranged so as to expand from the inner wall surface 7b side toward the outer wall surface 7c side, and each of the lower caulking punches 9a arranged radially is radial (forward direction) The lower caulking punches 9a are held so as to be movable in the retreating direction. The work holder unit 24 is configured to be movable integrally with the lower punch holder 7 in the height direction via the support plate 23. The plurality of lower caulking punches 9a held by the lower punch holder 7 are rollers protruding from the outer wall surface 7c of the lower punch holder 7 so as to be able to contact the lower concave wall surface 5c along the height direction. 93 and protrudes from the inner wall surface 7b of the lower punch holder 7 as the lower punch holder 7 moves downward so as to approach the lower pushing block 5 while the roller 93 is in contact with the lower concave wall surface 5c. The workpiece holder unit 24 is configured to be movable in the forward direction (radial direction) so as to approach the workpiece W (second caulking member W2) held by the workpiece holder unit 24.

  Further, the upper push block 6 has a work W (second caulking member) in which the movement axis of the center of curvature (arc center) of the upper concave wall surface 6c is held by the work holder unit 24 in a plane perpendicular to the thickness direction. It is moved downward so as to pass through the axis of W2). The upper punch holder 8 is configured to be movable in the height direction. Further, the work holder unit 24 has a downward movement axis of the axis of the workpiece W (second caulking member W2) held in the plane perpendicular to the thickness direction of the caulking device 1. The block 5 is moved downward together with the lower punch holder 7 so as to pass through the center of curvature of the lower concave wall surface 5c. The lower punch holder 7 moves downward so that the upper punch holder 8 approaches the lower punch holder 7 and comes into contact with the upper punch holder 8, and then comes into contact with the upper punch holder 8. 8 together with the butt 8 (while maintaining the butted state), the upper push block 6 moves downward at half the speed of the downward movement.

  According to the caulking device 1 of this embodiment, when the upper push block 6 moves downward so as to approach the upper punch holder 8 as the upper base plate 3 is moved downward by the hydraulic drive unit 4, The upper concave wall surface 6 c comes into contact with the rollers 93 of the plurality of upper caulking punches 9 b held by the upper punch holder 8. In this state, when the upper push block 6 further moves downward so as to approach the upper punch holder 8, the plurality of upper caulking punches 9 b held by the upper punch holder 8 are pushed by the upper concave wall surface 6 c, The workpiece W is caulked by moving forward so that 912 protrudes from the inner wall surface 8 b of the upper punch holder 8.

  In this way, the plurality of upper caulking punches 9b move in different directions (radial directions) by moving the one member (upper push block 6) in one direction (downward), so that the workpiece W moves in the circumferential direction. It is caulked along. Therefore, it is not necessary to independently drive the caulking punches in different directions as in the conventional case, and the apparatus configuration is simplified. Further, since the drive source of each caulking punch is the same, the control configuration is simplified. Further, since the plurality of upper caulking punches 9b are moved all at once by the movement operation of one member (upper push block 6), the caulking depth of each caulking portion can be easily and uniformly adjusted. Furthermore, since only one drive source is used, the manufacturing cost of the apparatus can be reduced.

  Further, since the plurality of upper caulking punches 9b are configured to move in the radial direction by being pushed by the upper concave wall surface 6c having a constant radius of curvature formed in the upper pressing block 6, the plurality of upper caulking punches 9b By making the shapes (dimensions) the same, the forward movement amount of each upper caulking punch 9b can be made constant. That is, the shapes of the plurality of upper caulking punches 9b can be unified, and the caulking depth by each caulking punch can be easily made constant. For this reason, the crimping apparatus which can obtain the simple and uniform crimping depth can be provided.

  Further, the lower punch holder 7 moves downward so as to approach the lower concave wall surface 5c of the lower push block 5 while maintaining the butted state, and the lower concave wall surface 5c is held by the lower punch holder 7. The plurality of lower caulking punches 9a are in contact with the rollers 93. In this state, the lower punch holder 7 further moves downward so as to approach the lower push block 5, and the plurality of lower caulking punches 9a are pushed by the lower concave wall surface 5c, whereby the plurality of lower caulking punches 9a. The workpiece W is caulked by moving forward so that the respective leading end portions 912 protrude from the inner wall surface 7 b of the lower punch holder 7. In this way, the workpiece W can be caulked over the entire circumference by the plurality of upper caulking punches 9b and the plurality of lower caulking punches 9a.

  Further, the radius of curvature of the upper concave wall surface 6 c is made smaller than the radius of curvature of the arc passing through the centers of the rollers 93 of the plurality of upper caulking punches 9 b held by the upper punch holder 8. Similarly, the radius of curvature of the lower concave wall surface 5c is smaller than the radius of curvature of the arc passing through the centers of the rollers 93 of the plurality of lower caulking punches 9a held by the lower punch holder 7. Therefore, when the upper push block 6 moves downward, the upper caulking punches 9b 'on both sides in the width direction among the upper caulking punches 9b first come into contact with the upper concave wall surface 6c, and the upper caulking punches in contact with each other. 9b ′ first moves in the forward direction. Similarly, when the upper push block 6 moves downward, the lower caulking punches 9a ′ on both sides in the width direction among the plurality of lower caulking punches 9a first come into contact with the lower concave wall surface 5c. These lower caulking punches 9a ′ first move in the forward direction. Then, the upper caulking punch 9b 'and the lower caulking punch 9a' come into contact with the outer peripheral surface of the work W (second caulking member W2), and the work W can be positioned with high accuracy.

  Further, when the lower caulking punch 9a and the upper caulking punch 9b move forward, the contact position between each caulking punch and the concave wall surface changes. At this time, a roller 93 attached to the rear end portion of each caulking punch rolls on the concave wall surface. Move. Thus, by smoothly changing the contact position between each crimping punch and the concave wall surface, the crimping punch can be reliably moved in the forward direction.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. For example, in the above embodiment, the roller 93 is attached to the rear end portion of each caulking punch, and the roller 93 is configured to roll on the concave wall surface during caulking. For example, a sphere is attached to the rear end portion of each caulking punch. It may be configured so that the sphere slides on the concave wall surface when caulking. Thus, the present invention can be modified without departing from the gist thereof.

DESCRIPTION OF SYMBOLS 1 ... Caulking device, 2 ... Lower base plate, 3 ... Upper base plate, 4 ... Hydraulic drive unit (distance changing means, moving mechanism), 5 ... Lower push block (fixed push block), 5c ... Lower concave shape Wall surface (fixed side concave wall surface), 6 ... Upper side push block (movable side push block), 6c ... Upper side concave wall surface (movable side concave wall surface), 7 ... Lower punch holder (fixed side punch holder), 7b ... Inside Wall surface, 7c ... outer wall surface, 7f ... through hole, 8 ... upper punch holder (movable punch holder), 8b ... inner wall surface, 8c ... outer wall surface, 8f ... through hole, 9 ... caulking punch, 9a ... lower caulking punch (fixed) Side caulking punch), 9b ... upper caulking punch (movable side caulking punch), 91 ... punch body, 911 ... base portion, 911a ... large diameter portion, 911b ... small diameter portion, 911c ... step surface, 912 ... tip portion, 9 DESCRIPTION OF SYMBOLS 3 ... Roller attachment part, 92 ... Hinge pin, 93 ... Roller (projection part), 94 ... Ring plate, 95 ... Caulking spring, 96 ... Fixed bracket, 961 ... Circular hole, 11 ... Base shaft, 12 ... Base spring, 15 ... Lower stopper shaft, 16 ... upper stopper shaft, 17 ... lower holding shaft, 20 ... upper holding shaft, 23 ... support plate, 24 ... work holder unit (holding member), 25 ... positioning block, W ... workpiece, W1 ... 1st caulking member, W2 ... 2nd caulking member

Claims (4)

A holding member that holds the caulking member so that the axial direction of the cylindrical caulking member is along the first direction;
The caulking member held by the holding member having a concave wall surface facing the outer peripheral surface side of the caulking member held by the holding member, wherein the cross-sectional shape perpendicular to the first direction is a semicircular arc shape A pushing block that is spaced apart in a second direction perpendicular to the first direction,
A punch holder disposed at a position between the concave wall surface and the caulking member held by the holding member;
A plurality of crimping punches held by the punch holder;
Distance changing means for changing a relative distance in a second direction between the concave wall surface and the punch holder;
With
The punch holder has an outer wall surface facing the concave wall surface side and an inner wall surface facing the outer peripheral side of the caulking member held by the holding member, and a plurality of caulking punches from the inner wall surface side to the outer wall surface side A plurality of crimping punches are held so that each crimping punch arranged radially is spread so as to be spread toward and radially movable.
The plurality of crimping punches held by the punch holder have a protruding portion protruding from an outer wall surface of the punch holder so as to be able to contact the concave wall surface, and the protruding portion is in contact with the concave wall surface. A caulking device configured to be movable in a radial direction so as to approach a caulking member held by the holding portion as the relative distance is shortened by a distance changing unit. A holding member that holds the caulking member so that the axial direction of the cylindrical caulking member is along the first direction;
In the case where the cross-sectional shape perpendicular to the first direction is a semicircular arc shape and the outer circumferential surface of the caulking member held by the holding member is divided into one half circumferential surface and the other half circumferential surface, the one half circumference A movable-side pushing block having a movable-side concave wall surface facing the surface side and spaced apart in a second direction perpendicular to the first direction with respect to the caulking member held by the holding member When,
A movable-side punch holder disposed at a position between the movable-side concave wall surface and the caulking member held by the holding portion;
A plurality of movable side crimping punches held by the movable side punch holder;
A moving mechanism for moving the movable push block along the second direction;
With
The movable punch holder has an outer wall surface facing the movable concave wall surface side and an inner wall surface facing the one half circumferential surface side of the caulking member held by the holding portion, and a plurality of the movable side The plurality of movable caulking punches are radially arranged so as to expand from the inner wall surface side toward the outer wall surface side, and the movable caulking punches arranged radially are movable in the radial direction. Hold the side caulking punch,
The plurality of movable-side caulking punches held by the movable-side punch holder have protrusions that protrude from the outer wall surface of the movable-side punch holder so as to be able to contact the movable-side concave wall surface, and the protrusions are A caulking member held by the holding portion as the movable side push block moves in the second direction so as to approach the movable side punch holder by the moving mechanism in a state where the movable side concave wall surface is contacted. The caulking device is configured to be movable in a radial direction so as to approach the position. The crimping device according to claim 2,
The cross-sectional shape perpendicular to the first direction is a semicircular arc shape, and has a fixed-side concave wall surface facing the other half circumferential surface side of the outer circumferential surface of the caulking member held by the holding portion, A fixed-side pushing block disposed opposite to the movable-side concave wall surface along the second direction with the caulking member held by the holding member held by the holding-side concave wall surface;
A fixed-side punch holder that is disposed at a position between the fixed-side concave wall surface and the caulking member held by the holding member, and configured to be movable in the second direction;
A plurality of fixed side crimping punches held by the fixed side punch holder,
The fixed-side punch holder has an outer wall surface facing the fixed-side concave wall surface side and an inner wall surface facing the other half circumferential surface side of the caulking member held by the holding member, and a plurality of fixed-side caulking punches Are arranged radially so as to spread from the inner wall surface side toward the outer wall surface side, and a plurality of fixed side crimping punches are movable in the radial direction. Hold and
The holding member is configured to be movable in the second direction together with the fixed side punch holder,
The plurality of fixed-side caulking punches held by the fixed-side punch holder have protrusions protruding from the outer wall surface of the fixed-side punch holder so as to be able to contact the fixed-side concave wall surface, Radial direction so as to approach the caulking member held by the holding member as the fixed side punch holder moves in the second direction so as to approach the fixed side push block while being in contact with the fixed concave wall surface A caulking device configured to be movable. In the caulking device according to claim 3,
The movable punch holder is configured to be movable in the second direction;
The fixed side punch holder contacts the movable side punch holder after moving in the second direction so that the movable side punch holder approaches the fixed side punch holder and then contacting the movable side punch holder. In the state where the movable side push holder is moved, the movable side push block is moved at a moving speed smaller than the moving speed in the second direction in the direction approaching the movable side punch holder. A crimping device configured to be movable in the second direction that is the same as the moving direction.

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