JP3923444B2 - Headrest stay press machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to pulp-less processing device to press forming a recess in the headrest stay surface made of metal pipe material.
[0002]
[Prior art]
The headrest of the vehicle seat is attached so that the height position can be adjusted by inserting two stays suspended from the headless train into the holes of the seat back. This type of stay is made of a metal pipe material, and a concave portion is formed on the surface thereof to engage with a hook fixed to the seat back to adjust the height position of the headrest.
As one type of processing method for this type of headrest stay, Japanese Patent Application Laid-Open No. 2002-137673 discloses a method for rolling a recess on the surface of the headrest stay by pressing the headrest stay against one roll punch. ing.
Japanese Patent Laid-Open No. 2002-361331 uses two roll punches, a first roll punch and a second roll punch, and presses the first roll punch against the headrest stay to preform the recess, and then A processing method is disclosed in which a recess is finally formed by pressing a two-roll punch.
[0003]
[Problems to be solved by the invention]
However, in the above processing method in which the recess is rolled by pressing the headrest stay against the roll punch, the recess tends to sag at the time of press molding, and a burr is generated because the press load is large. Therefore, the accuracy of the dimensional shape of the recess is poor.
In addition, in the processing method in which the first roll punch is preformed and then the second roll punch is finally molded, the headrest stay is removed from the holder after being preformed and set in another holder, and then the second roll punch is used for final molding. In this case, it is necessary to set the headrest stay holder twice, which is troublesome. If a special machine is installed to save the setting work, the machining cost will increase accordingly.
In view of the above problems can be pressing recess with high precision to the headrest stay made of metal pipe material, and an object of the invention to provide a pressurized KoSo location that can reduce the processing cost.
[0004]
[Means for Solving the Problems]
The invention according to claim 1 is relative to the cradle for mounting the headrest stay, the clamp means for fixing the headrest stay placed on the cradle, and the headrest stay fixed to the cradle by the clamp means. A plurality of roll punches are provided so as to be capable of advancing and retreating, and are individually assembled to the shaft so as to be rotatable, and are arranged along the advancing / retreating direction so that the amount of interference with the headrest stay fixed to the cradle increases gradually. A roll punch holder formed with an outer periphery of the headrest stay in order from the smallest to the largest amount of interference of each roll punch in the roll punch row by advancing the roll punch holder relative to the headrest stay. So that each roll punch can be Pressing to the recess of the part A press working apparatus of the configuration the headrest stay as press forming,
A plurality of sets of roll punch rows are formed in the roll punch holder, and the shaft centers of the shafts of one roll punch row and the shafts of the other roll punch rows are shifted in the advancing and retreating direction of the roll punch holder. Features.
[0005]
[Operation and effect of the invention]
According to the present invention, a plurality of roll punches are sequentially pressed at one place on the surface of the headrest stay to press the recess stepwise, so that the recess can be formed in a single pressing process, and the headrest stay is set in the holder. However , the processing cost can be reduced because only one time is required without preparing a dedicated machine. The press load is relatively small, and burrs are unlikely to occur. In addition to a small press load, the roll punch rotates, so that the roll punch is evenly worn. For this reason, the durable life of a roll punch is long and processing cost can be reduced.
Since each roll punch is pressed against the headrest stay so that the amount of interference between the headrest stay and the roll punch increases in order, the occurrence of sagging can be prevented, and the processing accuracy of the recess can be further improved.
Roll punch column than the digits plurality of sets setting can press working a recess at a plurality of positions of the headrest stays in correspondence with each roll punch column. In particular, since the shaft center of the roll punch assembly is shifted, the roll punches in one roll punch row and the roll punches in the other roll punch row do not hit the headrest stay at the same time. Is pressed by the headrest stay. For this reason, since the load of the roll punch can be reduced, the life of the roll punch is increased and the occurrence of burrs can be further suppressed.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
To be described on the basis of the present invention to drawings, there is shown a headrest stay 10 by pressing the recess by engaging pulp-less machining apparatus according to the present invention in FIGS. The headrest stay 10 is formed by bending a metal pipe material into a U shape, and is composed of one short portion 11 and two long portions 12 and 13c connected to both ends thereof, and the short portion 11 is forward. Recessed portions 14, 15, and 16 that are inclined and engage with hooks fixed to the seat back are formed at three locations inside the long portion 12. Each of the recesses 14, 15, and 16 includes corner portions 14a, 15a, and 16a, and tapered portions 14b, 15b, and 16b connected to the corner portions 14a, 15a, and 16a.
[0007]
It is shown schematically in flop-less processing device 20 of the present invention in FIG. The press working apparatus includes a base 21, a receiving base 22 that is fixed to the base 21 and on which the headrest stay 10 is placed, and a pair of clamp levers that are rotatably mounted on a frame 23 that is erected on the base 21 by a support shaft 24. 25, a pair of air cylinder actuators 26 installed on the base 21 and connected to the clamp levers 25, a press slider 27 provided so as to be able to advance and retract in the vertical direction with respect to the base 21, and a roll punch suspended from the press slider 27 A holder 30 is provided.
[0008]
A through hole 21 a through which the roll punch holder 30 passes is formed in the base 21. A passage 22a that is aligned with the through hole 21a and through which the roll punch holder 30 passes is formed in the pedestal 22, and a guide block 28 that is in sliding contact with the roll punch holder 30 is fixed to one side of the passage 22a. An arc-shaped groove 22b is formed at the upper end of the passage 21a of the cradle 22 on the side opposite to the guide block 28 so that the lower portion of one long portion 12 of the headrest stay 10 is fitted. A groove 22c having a semicircular cross section is formed in which the lower half of the other long portion 13 of the stay 10 is fitted.
[0009]
As shown in FIG. 4, the roll punch holder 30 includes two side frames 31, 32 and an inner frame 33 provided between the side frames 31, 32. Four shafts 34 are arranged in parallel at equal intervals and fixed to form a first shaft row. Further, between the other side frame 32 and the inner frame 33, four upper and lower shafts 35 are fixed in parallel at equal intervals to constitute a second shaft row. The axis 35a of each shaft 35 constituting the second shaft row is aligned on a straight line m as shown in FIG. Similarly, the shaft centers 34a of the shafts 34 constituting the first shaft row are also aligned on a straight line. Also, the axis 34a of each shaft 34 constituting the first shaft row and the axis 35a of each shaft 35 constituting the second shaft row are arranged in the vertical direction (press slider) so that their positions do not coincide with each other. (Moving forward / backward direction).
[0010]
As shown in FIG. 4, frustoconical roll punches 36 </ b> A to 36 </ b> D are rotatably assembled to the shafts 34 of the first shaft row of the roll punch holder 30 to form a first roll punch row. Each shaft 35 of the second shaft row is rotatably assembled with roll punches 37 </ b> A to 37 </ b> D that are formed by combining two truncated cones to form a second roll punch row. Each of the roll punches 36A to 36D in the first roll punch row has a ring-shaped outer peripheral convex portion 36a and a tapered outer peripheral surface 36b. Each of the roll punches 37A to 37D in the second roll punch row has ring-shaped outer peripheral convex portions 37a and 37b at both ends, and has tapered outer peripheral surfaces 37c and 37d between the both convex portions 37a and 37b. Each roll punch 36A to 36D in the first roll punch row has a smaller outer shape as it goes down, and a larger outer shape as it goes up. Similarly, the outer shape of each roll punch 37 in the second roll punch row is smaller at the lower side, and the outer shape is larger at the upper side. Therefore, the lower roll punches 36A to 36D and 37A to 37D have a smaller amount of interference with the long portion 12 of the headrest stay 10, and the upper ones are larger. Both the roll punch rows, the guide block 28 and the groove 22b of the pedestal 22 are fixed by the clamp lever 25 by fitting the long portions 12 and 13 into the grooves 22b and 22c when the press slider 27 is advanced downward. The roll punches 36 and 37 are arranged so as to intersect with the outer peripheral portion of one long portion 12 of the headrest stay 10.
In FIG. 3, only the roll punches 37A to 37D of the second roll punch row are displayed, and the first roll punch row is omitted for the sake of simplicity.
[0011]
The general structure of the headrest stay press working apparatus 20 is as described above. In order to process the recesses 14, 15, 16 in the headrest stay 10, the long portions of the headrest stay 10 are formed in the grooves 22 b, 22 c of the cradle 22. 12 and 13 are fitted, the air cylinder 26 is driven to rotate the clamp lever 25, and the long portions 12 and 13 of the headrest stay 10 are fastened and fixed to the receiving base 22 at the tip of the lever 25. At this time, the headrest stay 10 is placed on the cradle 22 so that the front sides of the long portions 12 and 13 are fitted into the grooves. Then, the punch slider 27 is advanced downward, and the roll punch holder 30 is inserted along the guide block 28 from the passage 22a into the through hole 21a. As the punch slider 30 moves forward, the roll punches 36A and 37A having the smaller diameters sequentially cross the long part 12 from the roll punches 36D and 37D having the larger diameters. , 15, 16 are formed in stages. At this time, the corners 14a, 15a, 16a of the recesses 14, 15, 16 are formed by the outer peripheral projections 36a, 37a, 37b of the roll punches 36, 37 of the roll punch row, and the tapered portions 14b of the recesses 14, 15, 16 are formed. , 15b, 16b are formed by tapered outer peripheral surfaces 36b, 37c, 37d of roll punches 36A-36D, 37A-37D.
[0012]
According to the present press working apparatus 20, a plurality of roll punches 36A to 36D, 37A to 37D having different diameters are sequentially pressed from a small diameter to a large one at predetermined positions on the surface of the headrest stay 10 to form the concave portions 14 and 15. , 16 are formed in stages, so that the occurrence of sagging and burrs can be suppressed and the accuracy of the dimensions and shapes of the recesses 14, 15, 16 can be increased. In addition to the small press load, the roll punches 36 and 37 rotate, so that the roll punches 36A to 36D and 37A to 37D are evenly worn. As a result, the roll punches 36A to 36D and 37A to 37D have a long durability life, and in addition, the recesses 14, 15, and 16 can be processed in a single pressing step, so that they can be processed at low cost.
[0013]
Since two sets of roll punches 36A to 36D and 37A to 37D are provided, the recesses 14, 15, and 16 can be pressed at a plurality of locations of the headrest stay 10 corresponding to each roll punch row. In particular, since the shaft centers 34a and 35a of the shafts 34 and 35 to which the roll punches 36A to 36D and 37A to 37D are assembled are shifted, when the roll punch holder 30 is moved downward, the roll punches 36A to 36D in one roll punch row The roll punches 37A to 37D in the other roll punch rows do not hit the headrest stay 10 at the same time, and only one roll punch 36A to 36D, 37A to 37D is always pressed against the headrest stay 10. For this reason, since the load of the roll punches 36A to 36D and 37A to 37D is small, the life of the roll punches 36A to 36D and 37A to 37D is increased, and the occurrence of Paris can be further suppressed.
[0014]
Since the headrest stay 10 can be firmly fixed to the receiving base 22 by the clamp lever 25, it is possible to reliably prevent the headrest stay 10 from slightly moving during the pressing of the recesses 14, 15, and 16 by the roll punches 36A to 36D and 37A to 37D. The recesses 14, 15, and 16 can be processed with high accuracy only in the one long portion 12.
Also, the roll punches 36A to 36D and 37A to 37D are pressed from the back side of the headrest stay 10 to press the recesses 14, 15 and 16, which is applied to the impact load acting on the headrest stay 10 from the back side. This is to increase durability. The headrest 10 must be able to withstand both an impact from the front and an impact from the rear, but the safety standard assumes that a larger impact force is applied from the rear than the front. According to the inventor's experiment, in order to improve the impact resistance from the rear side with respect to the headrest, it is more difficult to press the roll punches 36A to 36D and 37A to 37D from the back side of the headrest stay and to process the recesses. It turned out to be better than processing.
[0015]
FIG. 5 shows another embodiment 20A of the headrest stay press working apparatus according to the present invention. In the press working apparatus 20 described above, the shafts are parallel and the axes of the shafts 34 and 35 are aligned in a straight line, and the shafts 34 and 35 are arranged from the roll punches 36A and 37A having smaller diameters in order from the bottom to the top. By assembling the roll punches 36D and 37D having a large size, the amount of interference between the headrest stay 10 fixed to the pedestal 22 by the clamp lever 25 and each of the roll punches 36A to 36D and 37A to 37D increases in order from the bottom to the top. In this embodiment 20A, roll punches 38 of the same diameter are assembled to the shafts 34 and 35, and the amount of interference between the roll punches 38 and the long portion 12 of the headrest stay 10 increases in order from the bottom to the top. As shown, the shaft centers of the shafts 34 and 35 are laterally extended by a required dimension (perpendicular to the advancing and retracting direction of the roll punch holder 27 It is shifted in the direction).
Since the other configuration of the press working apparatus 20A according to the present embodiment is the same as that of the press working apparatus 20, the same components are denoted by the same reference numerals and description thereof is omitted. Further, illustration of roll punches corresponding to the roll punches 36A to 36D in the press working apparatus 20 is omitted.
[0016]
Next, the other embodiment of the present onset bright be described with reference to FIGS. In this embodiment, the core metal 40 shown in FIG. 5 is inserted into the long portion 12 of the headrest stay 10 to perform press working. The metal core 40 has an insertion part 41 inserted into the long part with a substantially rectangular cross-sectional shape, and a base part 42 having a cross-sectional shape obtained by cutting a part of the outer periphery of the circle flat and fixed so as not to rotate with a jig. And a knob 43 having a circular cross section, and the bottom of the insertion portion 41 is manufactured to have the same radius of curvature as the inner diameter of the long portion 12.
[0017]
After fitting the long portions 12 and 13 of the headrest stay 10 into the grooves of the cradle 22 of the press working apparatus 20 and fixing them with the clamp lever 25, the insertion portion 41 of the core metal 40 is inserted into the long portion 12. Fix with a jig (not shown) to prevent rotation. If the recesses 14, 15, and 16 are formed with the roll punches 36A to 36D and 37A to 37D in this way, deformation of the pipe material can be prevented, and the recesses can be processed with higher accuracy.
[0018]
The press working apparatus according to this embodiment described above uses four roll punches 36A to 36D and 37A to 37D in a row, but is not limited to four, and the number of roll punches in a row is from two. In the range of seven, it is good to select suitably according to the material of a metal pipe, thickness, a diameter, and the shape of the recessed part which should be processed. When processed with one roll punch, the sagging is too large. On the other hand, when seven or more roll punches are used, sagging is reduced, but the degree of work hardening is increased and the strength of the headrest stay is reduced. More preferably, the selection is made in the range of 3 to 6. The roll punches 36A to 36D and 37A to 37D are moved up and down in the vertical direction with respect to the headrest stay 10 fixed to the pedestal 22, and the recesses 14, 15, and 16 are pressed, but the roll punches 36A to 36D, 37A to It is also possible to press the recesses 14, 15, and 16 by fixing the 37 </ b> D and moving the cradle 22 side forward and backward. The cross-sectional shape of the recesses 14, 15, 16 is processed into a shape composed of corner portions 14 a, 15 a, 16 a and taper portions 14 b, 15, 16, but the outer peripheral protrusions of the roll punches 36 A to 36 D, 37 A to 37 D, 39 By changing the shapes of 36a, 37a, 37b and the tapered outer peripheral surfaces 36b, 37c, 37d, it is possible to press a concave portion having a rectangular cross section.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a headrest stay processed by a press working apparatus according to the present invention.
FIG. 2 is a front view showing the headrest stay.
3 is a front view showing a schematic configuration of a headrest stay pre scan machining apparatus according to an embodiment of the present invention.
FIG. 4 is a side view showing a roll punch holder of the press working apparatus.
FIG. 5 is a front view showing a schematic configuration of a headrest stay press working apparatus according to another embodiment of the present invention.
FIG. 6 is a perspective view showing a mandrel used in the headrest stay press working apparatus according to the present invention.
FIG. 7 is a perspective view showing a state in which a concentric metal is inserted into a metal pipe member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Headrest stay, 12 ... Long part, 14, 15, 16 ... Recess, 20 ... Headrest stay press processing apparatus, 34, 35 ... Shaft, 36A-36D, 37A-37D, 39 ... Roll punch, 40 ... Core Money.

Claims (1)

A cradle for mounting the headrest stay, a clamp means for fixing the headrest stay placed on the cradle, and a plurality of headrest stays that are movable relative to the headrest stay fixed to the cradle by the clamp means. A roll punch holder in which a roll punch row is formed by being arranged along the advancing and retreating direction so that the amount of interference with the headrest stay fixed to a pedestal increases gradually. The roll punch holder is moved forward relative to the headrest stay so that each roll punch in the roll punch row intersects the outer periphery of the headrest stay in order from the smallest interference amount to the largest one. Press the outer periphery of each roll punch at a predetermined location on the surface to A press working apparatus of the configuration the headrest stay to press forming,
A plurality of sets of roll punch rows are formed in the roll punch holder, and the shaft center of one roll punch row and the shaft center of the other roll punch row are shifted in the advancing and retreating direction of the roll punch holder. A press working device for headrest stays.

Images