JP3976243B2 - Automatic drilling rivet fastening device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make the depth of a cavity and the height of a rise adjustable, by one type of die, in accordance with caulking conditions such as the material and thickness of each member to be fastened, the number of sheets and thickness of the entire members to be fastened, and a caulking load on the entirety. <P>SOLUTION: The automatic piercing rivet fastening device fastens a plurality of members 3a, 3b to be fastened which are stacked on the top face of a die 7, by a self-piercing rivet 8 pressed down by a punch 6. In this device, the die 7 is divided into a bottom wall 10 and a circumferential side wall 11 that surrounds the bottom wall along the circumferential direction; and, in the axial center of the bottom wall 10, there is installed freely vertically movably a push-up member 14 which is for caulking/deforming outward in the radial direction a caulking part at the tip end of the fastening axis 8a of the self-piercing rivet 8. The bottom wall 10 and the circumferential side wall 11 are fitted so as to be freely elevated or lowered mutually, thereby making it possible to change the depth of the cavity 12 formed by the walls 10, 11 and the thrusting height of the push-up member 14 against the cavity 12, in accordance with the sheet combination of the members 3a, 3b to be fastened. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic perforation rivet fastening device for fastening a plurality of types of members to be fastened (a plurality of types of plates or the like) with an automatic perforation rivet, and more particularly to an improvement of a fastening die (receiving die). .
[0002]
[Prior art]
FIG. 10 is an explanatory view of the fastening operation of this conventional automatic drilling rivet fastening device. As shown in the figure, the punch a and the die b of the automatic drilling rivet fastening device are arranged at a predetermined interval in the vertical direction. A dish-shaped cavity c that is recessed axially downward from the top surface is formed at the top of the die b, and a raised portion d that is raised to a predetermined height on the punch a side is provided at the center of the bottom surface of the cavity c.
A cylindrical or conical recess h is provided at the front end of the fastening leg g1 of the rivet g that fastens the members e and f to be fastened, and the outer side of the recess h is the fastened member e on the punch a side. And a crimped portion for the decided fastening member f on the die b side.
[0003]
Such caulking by self-piercing rivets is completed through a start stage, a piercing stage, a flare stage, and a final stage as shown in FIG. As shown in FIG. 10 (a), when the punch a is lowered and the fastened member e on the punch a side is punched by the cutting edge of the rivet g as shown in FIG. 10 (b), the fastened member on the die b side is fastened. The member f enters the cavity c by being pressed by the fastening leg g1. The fastened member f on the die b side is supported by the raised portion d on the die b side and is relatively pushed up from below. Since the raised portion d has a tapered shape that is successively reduced in diameter toward the punch a side, the outer surface of the raised portion d and the inner surface of the cylindrical or conical recess h of the fastening leg g1 are covered on the die b side. The fastening member f is sandwiched. For this reason, the to-be-fastened member e on the punch a side loses its place and enters into the recess h. When the punch a descends and the pressing force toward the radially outer side against the inner surface of the recess h increases due to the taper of the raised portion d, the cutting edge of the rivet g and the caulking portion are formed as shown in FIG. The outer part is expanded radially outward from a certain recess h. Then, as shown in FIG. 10D, when the relative pressing with respect to the raised portion d is completed and the crimped portion of the fastened member f on the die b side and the crimped portion of the rivet g are plastically deformed, The fastened member e and the fastened member f on the die b side are integrated.
[0004]
[Problems to be solved by the invention]
As described above, when self-piercing rivets (hereinafter simply referred to as rivets) are used for fastening, it is possible to prevent water from entering due to the penetration of the rivets, and there is an advantage that painting is possible compared to the case of joining by spot welding. .
By the way, in order to firmly fix the to-be-fastened member e on the punch a side and the to-be-fastened member f on the die b side using the automatic punching rivet fastening device without rattling, the material and meat of the to-be-fastened members e and f It is necessary to determine the depth of the cavity c and the height of the raised portion d in accordance with the caulking conditions such as the thickness and the number of fastened members e and f to be fastened.
However, a different die is required for each caulking condition, and there is a problem that an operation of exchanging the die b is required each time. For this reason, it is assumed that the number of combinations of the members to be fastened e and f is small, preferably standardized as a single combination, or loosening the strength standard of fastening, but standardization for a single combination is actually Moreover, it is not adopted to loosen the strength standard because reliability is lowered.
Therefore, in the automatic perforation rivet fastening device, by using one type of die, it is possible to correspond to the crimping conditions such as the material and thickness of each fastened member, the total number of fastened members, the plate thickness (thickness) and the caulking load. The technical problem to be solved in order to make it possible to adjust the depth of the cavity and the height of the raised portion arises, and it is an object of the present invention to solve this object.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 is an automatic perforation rivet fastening device configured to fasten a plurality of fastened members placed on top of a die by self-piercing rivets pressed by a punch, The die is formed by dividing a bottom wall and a peripheral side wall surrounding the bottom wall in the circumferential direction, and a caulking portion on the distal end side of the fastening leg of the self-piercing rivet is radially formed on the shaft core portion of the bottom wall. A central pin for caulking and deforming outward is provided so as to be movable up and down, and the bottom wall and the peripheral side wall are fitted so as to be movable up and down relatively. The lower surface of the central pin is supported by an inclined surface of a slider installed to be movable back and forth with respect to the central pin, the lower surface of the central pin is formed in a round head, and the inclined surface is on the central pin side Formed on a curved surface that gradually decreases in height toward An automatic drilling rivet fastening device is provided.
If it does in this way, the depth of the cavity tee which a peripheral side wall and a bottom wall form according to a board set of a to-be-fastened member (plate material, a belt board, a plate, etc.) and the push-up height of the center pin to a cavity can be changed. Since it can do, to-be-fastened members can be fastened corresponding to a caulking condition.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of an automatic drilling rivet fastening device according to the present invention will be described with reference to the accompanying drawings.
(First embodiment)
1 to 5 show an automatic drilling rivet fastening device according to a first embodiment, FIG. 1 is an explanatory view showing the overall configuration of the automatic drilling rivet fastening device, and FIG. 2A is a main part of a die part. 2B is a detailed sectional view, FIG. 2B is a sectional view taken along line AA of FIG. 2A, FIG. 3 is an explanatory view showing a caulking process between members to be fastened by automatic drilling rivets, and FIG. Sectional drawing which shows the modification of the slider and center pin of the automatic drilling rivet fastening apparatus which concerns on a form, FIG. 5: is sectional drawing which shows the modification of the die | dye in 1st Embodiment, and a die attachment part.
[0008]
Referring to FIGS. 1 to 3, the support frame 2 of the automatic perforating rivet fastening device 1 is formed in a C shape to facilitate installation of the fastened members 3a and 3b.
A punch attachment portion 4 and a die attachment portion 5 are respectively provided at an upper end portion and a lower end portion of the support frame 2, and a punch 6 and a die 7 are attached thereto, respectively. The punch 6 and the die 7 are arranged coaxially and at a predetermined interval in the vertical direction. The rivet 8 is interposed between the fastened member 3a on the punch 6 side and the front end surface 6a of the punch 6, and is attached to the automatic drilling rivet device 1 with a hydraulic, pneumatic cylinder, screw type The rivet lowering device 9 such as the actuator is extended toward the fastened members 3a and 3b. The die 7 is divided into a columnar bottom wall 10 extending from the top surface of the die attachment portion 5 toward the punch 6 and a peripheral side wall 11 surrounding the bottom wall 10 in the circumferential direction. A male screw 10a is formed on the outer peripheral surface of the bottom wall 10 from one end to the other end. A female screw 11a that is screwed into the male screw 10a is formed on the inner surface of the lower side of the peripheral side wall 11, and the peripheral side wall 11 can be raised and lowered to the bottom wall 10 via the male screw 10a and the female screw 11a. Is fitted.
When the peripheral side wall 11 of the die 7 is rotated and the peripheral side wall 11 is lowered from the punch mounting portion 4 side to the die mounting portion 5 side by rotation, the cavity 12 of the die 7 partitioned into the bottom wall 10 and the peripheral side wall 11 is formed. The depth (dish depth) becomes shallower. Further, when the peripheral side wall 11 is reversely rotated to raise the peripheral side wall 11 from the die attaching part 5 side to the punch attaching part 4 side, the depth (dish depth) of the cavity 12 of the die 7 is increased. The height of the bottom wall 10 and the peripheral side wall 11 is such that the depth of the cavity 12 depends on the caulking conditions such as the number, thickness, and material of the members to be fastened 3a and 3b placed on the top surface of the peripheral side wall 11. It is determined so that it can respond.
[0009]
A central pin guide hole 13 is opened at the center of the bottom wall 10, and the central pin 14 is fitted in the central pin guide hole 13 so as to be movable up and down. The center pin guide hole 13 extends along the axial line of the bottom wall 10 into the lower portion of the die attachment portion 5 and communicates with the slider guide hole 15 opened on the lower side surface of the lower portion of the die attachment portion 5. ing. The slider guide hole 15 extends forward of the central pin guide hole 13. The slider guide hole 15 is formed to prevent the slider 16 from rotating. A wedge-shaped inclined surface 16a whose height gradually decreases from the inlet side to the inner side of the slider guide hole 15 is provided at the tip of the slider 16, and the lower end surface of the central pin 14 is supported by the inclined surface 16a. ing. The lower end surface of the center pin 14 is also a wedge-shaped inclined surface 14 a that contacts the inclined surface 16 a of the slider 16.
[0010]
When the slider 16 is mechanically driven, a slider driving device for moving the slider 16 in the front-rear direction and moving the central pin 14 up and down by the inclined surfaces 14a, 16a, for example, hydraulic, pneumatic, An electromagnetic or screw type actuator (not shown) is attached.
The distal end portion 14b of the center pin 14 is reduced in diameter sequentially from the lower end portion side to the upper end portion side, similarly to the raised portion d described in the section of the prior art, and the distal end surface of the fastening leg 8a of the rivet 8 It is adapted to engage with a conical or cylindrical recess 8b that opens to the bottom.
For this reason, the depth of the cavity 12, the initial position of the center pin 14 with respect to the depth of the cavity 12, and the caulking or drilling are performed by a plurality of trials with different caulking conditions such as the thickness and material of the fastened members 3a and 3b. If the elevating timing of the center pin 14 with respect to the fastened members 3a and 3b for the purpose is determined empirically, the fastened members 3a and 3b can be fastened under the optimum crimping conditions, and the optimum fastening strength can be obtained. It becomes possible to conclude.
The length of the fastening leg 8a of the rivet 8 and the depth of the recess 8b are uniquely determined according to the caulking conditions between the fastened members 3a and 3b such as the thickness and material of the fastened members 3a and 3b. It is determined. Further, as shown in FIG. 2B, a stopper 17 is attached to the top surface of the die attachment portion 5 to prevent the rotation of the peripheral side wall 11, and the movement of the slider 16 is stopped on the bottom surface of the die attachment portion 5. A set screw 18 is provided so that the peripheral side wall 11 and the slider 16 can be locked at the set initial positions.
[0011]
Next, a caulking process between the fastened members 3a and 3b will be described with reference to FIGS.
First, as a preparation stage, the depth of the cavity 12, the downward stroke of the punch 6, and the lift of the slider 16 are determined. The depth of the cavity 12 and the height (mountain height) of the center pin 14 are adjusted by the rotation of the peripheral side wall 11 in accordance with the aforementioned caulking conditions. The lowering stroke of the punch 6 is determined by the extension amount of the rivet lowering device 9, and the position of the slider 16 is determined by moving the slider 16 back and forth.
The preparation stage is completed, the rivet 8 is mounted on the punch 6, the punch 6 is lowered by the extension of the rivet lowering device 9, and the rivet 8 is pushed down. The to-be-fastened member 3b on the die 7 side enters the cavity 12 by the tip of the fastening leg 8a of the rivet 8 that becomes the cutting edge and the crimping portion (FIG. 3A).
When the rivet 8 is further pushed down, the fastened member 3b on the die 7 side is supported by the tip portion 14b of the center pin 14. At this time, the fastened member 3b on the punch 6 side loses its place, so that it enters into the recess 8b that opens at the distal end surface of the fastening leg 8a (FIG. 3B).
By the relative push-up of the center pin 14, the crimped portion of the fastened member 3b on the die 7 side becomes a cone or a column and enters the recess 8b of the fastening leg 8a, and the tip end portion of the fastening leg 8 serves as the crimped portion. It is plastically deformed in a trumpet shape radially outward (FIG. 3C).
Furthermore, as shown in FIG. 3D, when the rivet 8 is pushed by the punch 6, the degree of diameter expansion of the crimped portion of the fastened member 3b on the peripheral side wall 11 side increases.
When the punch 6 reaches the lowest point, the trumpet-shaped expansion of the crimped portion of the fastened member 3b on the die 7 side and the trumpet-shaped opening of the recess 8b of the fastening leg 8a are completed, and the fastened side on the die 7 side is fastened. The crimped portion of the member 3b is in close contact with the inner surface of the recess 8b of the fastening leg 8a and the crimped portion of the rivet 8 without a gap.
Therefore, the fastened member 3a on the punch 6 side can be fastened integrally and firmly with the fastened member 3b on the peripheral side wall 11 side via the rivet 8 by one type of die 7.
[0012]
By the way, the slider 16 may be operated by an actuator while the punch 6 is lowered, and the rivet 8 may be crimped by the slider 16 to fasten the fastened members 3a and 3b.
In this case, for example, the lowering stroke of the punch 6 and the initial position of the slider 16 are such that when the punch 6 reaches the lowest lowering point, the fastened member 3a on the punch 6 side is covered on the peripheral side wall 11 side. The fastening member 3b is supported via the distal end portion 14b of the central pin 14, and as a result, the fastening leg 8a of the rivet 8 is determined so that the drilled member 3a on the punch 6 side is completed or just before completion. Keep it. The stroke of the actuator determines the lift of the slider 16 so that the fastened members 3a and 3b are firmly fastened by pushing up the central pin 14 at the position where the punch 6 reaches the lowest point. deep.
When such a preparation stage is completed, the rivet 8 is mounted on the punch 6, the punch 6 is lowered by the extension of the rivet lowering device 9 and the rivet 8 is pushed down, and the cutting leg of the fastening leg 8 a of the rivet 8 becomes a caulking portion The fastened member 3b on the die 7 side enters the cavity 12 by the tip end of the fastening leg 8a (FIG. 3A).
When the rivet 8 is pushed down and the rivet 8 is pushed down by the lowering stroke of the rivet lowering device 9, the fastened member 3 b on the die 7 side is supported by the tip 14 b of the center pin 14. At this time, the fastened member 3a on the punch 6 side loses its place, so that it enters into the recess 8b that opens at the distal end surface of the fastening leg 8a (FIG. 3B).
Next, while maintaining the extension of the rivet lowering device 9 and holding the rivet 8 at the lowest point of the punch 6, the actuator as the slider driving means is extended to move the slider 16 to the inlet side of the slider guide hole 15. Move from the back to the back.
As the center pin 14 is pushed up, the crimped portion of the fastened member 3b on the die 7 side becomes a cone or a column and enters the recess 8b of the fastening leg 8a. The fastening member 3b on the die 7 side is sandwiched between the outer surface of the tip portion 14b of the center pin 14 and the inner surface of the cylindrical or conical recess 8b of the fastening leg g1. For this reason, the to-be-fastened member 3a on the punch 6 side loses its place and enters into the recess 8b (FIG. 3C).
When the slider 16 is further advanced and the caulking portion of the fastened member 3b on the die 7 side is pushed into the recess 8b of the fastening leg 8a by the central pin 14, the diameter of the caulking portion of the fastened member 3b on the peripheral side wall 11 side is increased. To increase.
When the lifting of the center pin 14 by the movement of the slider 16 is completed, the crimping portion of the fastened member 3b on the die 7 side and the radially outward expansion of the recess 8b of the fastening leg 8a are completed, and the die 7 side The crimped portion of the fastened member 3b is in close contact with the inner surface of the recess 8b of the fastening leg 8a and the crimped portion of the rivet 8 without a gap (FIG. 3 (d)).
Therefore, the fastened member 3a on the punch 6 side can be fastened integrally and firmly with the fastened member 3b on the peripheral side wall 11 side via the rivet 8 by one type of die 7.
[0013]
1 and 2, the slope 16a of the slider 16 has been described as a straight surface. However, as shown in FIG. 4, the slope 16a extends from the inlet side of the slider guide hole 15 to the back side. It is also possible to form a curved surface that gradually decreases in height toward the front, and the lower surface of the central pin 14 may also be formed in a round head.
In this way, the lower surface of the center pin 14 is brought into point contact with the inclined surface 16a of the slider 16, so that instability during the fastening operation of the center pin 14 is eliminated.
[0014]
Further, as shown in FIG. 5, a stepped portion 10b having a reduced diameter is provided at the lower portion of the peripheral side wall 11, and a cylindrical fitting portion 5a for fitting the stepped portion 10b is provided at the top of the die attaching portion 5. Alternatively, the step portion 10b may be fitted to the fitting portion 5a and supported by simply fitting the step portion 10b to the top surface of the die attachment portion 5.
Since only a load in the vertical direction acts on the peripheral side wall 11, it is possible to fasten the fastened members 3 a and 3 b as described above only by restricting the radial movement of the peripheral side wall 11 in this way. . Moreover, since the bottom wall 10 can be removed with the surrounding side wall 11 in this way, a maintenance and management can be made easy.
[0015]
Hereinafter, another embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the structure which is the same as that of 1st Embodiment, or detailed description shall be abbreviate | omitted.
[0016]
(Second Embodiment)
Next, a second embodiment of the automatic drilling rivet fastening device of the present invention will be described with reference to FIG. In this embodiment, the slider 16, the slider guide hole 15 and the actuator as the slider driving device shown in FIG. 1 are eliminated, and instead of the central pin guide hole 13 as shown in FIG. The lower portion is expanded in diameter and opened downward, and a step portion 21 is provided at the lower portion of the central pin 14 to be fitted into the expanded portion 20 of the central pin guide hole 13.
Therefore, also in this embodiment, the fastened members 3a and 3b can be firmly fastened. Further, since the center pin 14 and the peripheral side wall 11 can be fixed by the set screw 25 and the set screw 27, punching and caulking of the central pin 14 and the peripheral side wall 11 with respect to the fastened member 3a on the punch 6 side are made accurate. be able to.
In addition, since caulking is performed by the center pin 14, the male screw 21a on the inner surface of the male screw 21a of the stepped portion 21 and the enlarged diameter portion 20 has screw strength and screw rotation efficiency with a cross section of the screw trapezoidal or rectangular. You may make it improve.
[0017]
A female screw 20 a is provided on the inner surface of the enlarged diameter portion 20, and a male screw 21 a is provided on the outer peripheral surface of the step portion 21 connected to the central pin 14 to be screwed with the female screw 20 a of the enlarged diameter portion 20. It has been. A screw hole 24 is formed in the side wall of the die attachment portion 23 so as to open inside and outside the enlarged diameter portion 20, and a set screw 25 as a stopper is screwed into the screw hole 24. The peripheral side wall 11 is also formed with a screw hole 26 that opens to the inner peripheral surface and the outer peripheral surface of the peripheral side wall 11, and a set screw 27 as a stopper is screwed into the peripheral side wall 11. The length of the bottom wall 10 and the peripheral side wall 11 depends on the caulking conditions such as the number, thickness, and material of the fastened members 3a and 3b placed on the top surface of the peripheral side wall 11. Are determined to correspond.
[0018]
When the height of the central pin 14 with respect to the cavity 12 is mechanically changed, an actuator or a motor, preferably a stepping motor (not shown), is driven to the stepped portion 21 by a hydraulic or pneumatic pressure via a connecting shaft 22. Z). When the height of the center pin 14 is mechanically changed, the operations other than raising and lowering the center pin 14 by raising or lowering the center pin 14 by a motor (stepping motor) are the same as the procedure in the first embodiment. It becomes.
[0019]
(Third embodiment)
Next, with reference to FIG.7 and FIG.8, 3rd Embodiment of the automatic drilling rivet fastening apparatus of this invention is described.
7 and 8, the die 27 includes a columnar bottom wall 31 extending from the top surface of the die attachment portion 30 to the punch 6 side, and a peripheral side wall 32 surrounding the bottom wall 31 in the circumferential direction. It is divided into A male screw 31a is formed on the outer peripheral surface of the bottom wall 31 from one end to the other end. Then, by rotating the height adjusting lever 37, the elevation position of the center pin 39 can be changed, and the height of the tip 39b of the center pin 39 from the bottom wall 31 can be changed.
Further, a female screw 32 a for screwing a male screw 31 a formed on the outer peripheral surface of the bottom wall 31 is provided on the inner peripheral surface on the lower side excluding the upper end side of the peripheral side wall 32. The top surface of the die attachment portion 30 is provided with a cylindrical portion 33 that is open on the punch 6 side so that the peripheral side wall 32 can be moved up and down, and the inner peripheral surface of the cylindrical portion 33 and the peripheral side wall On the outer periphery of 32, a female screw 34 and a male screw 35 for fitting the peripheral side wall 32 up and down with respect to the cylindrical portion 33 are provided.
A lever insertion opening 36 is formed in the lower portion of the die attachment portion 30 so as to open inside and outside the tubular portion 33, and the height adjustment inserted into the tubular portion 33 through the lever insertion opening 36. The tip of the lever 37 is screwed into the bottom of the peripheral side wall 32.
[0020]
The lever insertion port 36 extends along the rotation direction of the peripheral side wall 32 and the height direction of the cylindrical portion 33, and rotates the peripheral side wall 32 with the height adjustment lever 37 fixed by hand. The bottom wall 31 is moved up and down relative to the peripheral side wall 32 and the cylindrical portion 33. The height of the bottom wall 31 and the peripheral side wall 32 depends on the caulking conditions such as the number, thickness, and material of the fastened members 3a and 3b placed on the top surface of the peripheral side wall 32. Is determined to correspond.
A guide hole 38 is opened at the center of the bottom wall 31. The center pin 39 inserted into the guide hole 38 is screwed into a screw hole 29 opened on the bottom surface of the die attachment portion 30 and is fixed by caulking or an adhesive.
[0021]
When configured in this manner and the height of the peripheral side wall 32 is adjusted by the height adjusting lever 37, the depth (dish depth) of the cavity 12 of the die 27 partitioned into the bottom wall 31 and the peripheral side wall 32 is a caulking condition. As in the first and second embodiments described above, the fastened members 3a and 3b can be firmly fastened by a single die 27. .
[0022]
The height adjusting lever 37 is connected to a retractable actuator such as a hydraulic pressure, air pressure, screw type or the like via a link lever (not shown), and the position of the peripheral side wall 32 is determined by the expansion and contraction of the actuator. You may comprise so that the raising / lowering position of the surrounding side wall 32 can be adjusted by hold | maintaining the bottom wall 31 by the stop of an actuator.
[0023]
(Fourth embodiment)
Next, a fourth embodiment of the automatic drilling rivet fastening device of the present invention will be described with reference to FIG.
Referring to FIG. 9, the die 37 has a columnar bottom wall 41 attached to the die attachment portion 40 so as to be movable up and down, and an opening on the top surface of the die attachment portion 40 so as to fit the bottom wall 41 up and down. It is comprised by the cylindrical fitting part 42 to do.
The upper part of the fitting part 42 also serves as the peripheral side wall in this embodiment. Near the center of the bottom wall 42, there is provided a first slider guide hole 43 that passes back and forth across the bottom wall 42, and a second slider guide hole 44 is provided on the bottom side of the die attachment part 40. Yes.
The bottom wall 41 is provided with a center pin guide hole 45 that opens to the first slider guide hole 43 and the top surface of the bottom wall 41, and the center pin 46 can be moved up and down in the center pin guide hole 45. It is mated.
The lower end surface of the center pin 46 is supported by an inclined surface 47a provided at the tip of the first slider 47 inserted into the first slider guide hole 43, and is lifted and lowered by the movement of the first slider 47 in the front-rear direction. It has become so.
[0024]
The bottom wall 41 is inserted into the second slider guide hole 44 and supported by the inclined surface 48a at the tip of the second slider 48 that moves forward and backward, and is configured to move up and down by the movement of the second slider 48 in the front-rear direction. Is done.
The slope 47a of the first slider 47 and the slope 48a of the second slider 48 are directed toward the back side of the first slider guide hole 43 and the second slider guide hole 44 as described in the first embodiment. Although the inclined surface gradually descends, as described with reference to FIG. 4, the inclined surfaces 47 a and 48 a gradually increase from the entrance side to the back side of the first slider guide hole 43 and the second slider guide hole 44. The lower surface of the central pin 46 and the bottom wall 41 may be formed on the curved surface so as to make point contact with the inclined surfaces 47a and 48a. Alternatively, the first slider 47 and the second slider 48 may be driven by the above-described slider driving means to raise and lower the center pin 46 and the bottom wall 41, respectively.
[0025]
Because the first slider 47 and the second slider 48 can arbitrarily adjust the raising / lowering positions of the center pin 46 and the bottom wall 41, as in the first to third embodiments described above, The height (dish height) of the cavity 12 can be adjusted in accordance with the caulking conditions, and the initial height of the central pin 46 with respect to the cavity 12 and the push-up time can be adjusted. Therefore, also in this embodiment, the fastened members 3a and 3b can be firmly fixed to each other by one type of die 37.
[0026]
In each of the above-described embodiments, the description has been given of the case where the two members to be fastened are overlapped and fastened by the rivet 8, but the present invention is naturally applicable to the fastening of two or more fastened members. is there. Moreover, in each embodiment, when caulking the member to be fastened, the punch was first lowered and then the center pin was raised, but this may be reversed. Furthermore, depending on the member to be fastened, the center pin or the punch may be repeatedly raised and lowered to eliminate the gap and perform the caulking with higher reliability.
[0027]
Furthermore, although the dent 8b formed in the fastening leg 8a of the rivet 8 has been described as being formed in a conical or cylindrical shape, the shape is not limited as long as it is circularly conical or cylindrical. Further, the depth of the depression is determined in accordance with the caulking condition described above.
[0028]
Further, in each embodiment of the present invention, the bottom wall and the center pin are lifted and lowered by the slider. However, it may be lifted and lowered by using various cam mechanisms instead of the slider. Thus, the present invention can be modified in various ways, and the present invention naturally extends to this modified invention.
[0029]
【The invention's effect】
As described above, according to the present invention, the following excellent effects are exhibited.
(1) Since the depth of the cavity tee formed by the peripheral side wall and the bottom wall and the push-up height of the center pin with respect to the cavity can be changed according to the plate set of the member to be fastened, the member to be fastened corresponding to the caulking conditions It becomes possible to fasten each other. As a result, it is possible to reduce the number of rivet parts and the caulking portion, thereby contributing to overall cost reduction.
(2) Since the cavity depth and the center pin push-up height can be arbitrarily changed according to the crimping conditions such as the number of members to be fastened and the combination of one type of die, the conventional die change Is no longer necessary. Therefore, it can contribute to cost reduction.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing the overall configuration of an automatic drilling rivet fastening device according to the present invention.
2 shows a die of an automatic perforation rivet fastening device according to the present invention, FIG. 2 (a) is a detailed cross-sectional view of the main part of the die part, and FIG. 2 (b) is a cross-sectional view taken along line AA in FIG. 2 (a). FIG.
FIG. 3 is an explanatory view showing a caulking process between members to be fastened by the automatic perforating rivet fastening device according to the present invention.
FIG. 4 is a cross-sectional view showing a modified example of the slider and the center pin of the automatic drilling rivet fastening device according to the present invention.
FIG. 5 is a cross-sectional view showing a modified example of the die and the die attaching portion of the automatic drilling rivet fastening device according to the present invention.
FIG. 6 is a sectional view showing a second embodiment of the automatic drilling rivet fastening device of the present invention.
FIG. 7 is a cross-sectional view showing a third embodiment of a die and a die attachment portion according to the automatic drilling rivet fastening device of the present invention.
FIG. 8 is an exploded perspective view showing a third embodiment of a die and a die attaching portion according to the automatic drilling rivet fastening device of the present invention.
9 is a cross-sectional view showing a fourth embodiment of the automatic perforating rivet fastening device of the present invention, FIG. 9 (a) is a side cross-sectional view, and FIG. 9 (b) is a cross-sectional view along B- in FIG. 9 (a). It is B line sectional drawing.
FIG. 10 is an explanatory view of a fastening operation of a conventional automatic drilling rivet fastening device.
[Explanation of symbols]
1 Automatic drilling rivet fastening device
3a, 3b Fastened member
6 punches
7 die
8 Self-piercing rivets
8a Fastening leg
10 Bottom wall
11 Perimeter side wall

Claims (1)

An automatic drilling rivet fastening device configured to fasten a plurality of fastened members placed on top of a die by a self-piercing rivet pressed by a punch,
The die is formed by dividing a bottom wall and a peripheral side wall surrounding the bottom wall in the circumferential direction. A center pin for caulking and deforming outward is provided so as to be able to move up and down, and the bottom wall and the peripheral side wall are fitted so as to be able to move up and down relatively ,
The lower surface of the center pin is supported by a slope of a slider installed to be movable back and forth with respect to the center pin,
An automatic perforating rivet fastening device , wherein the lower surface of the central pin is formed in a round head, and the inclined surface is formed in a curved surface that gradually decreases in height toward the central pin side .

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