JP3792778B2 - Manufacturing method and manufacturing apparatus for double curved surface shaped parts - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manufacturing method and a manufacturing apparatus for a double curved surface shaped part.
[0002]
[Prior art]
As shown in FIG. 15, a part that is bent so that two curved surfaces overlap each other with a gap, that is, a so-called double-curved part (EA plate 10 as an example) is generally processed using a multi-forming press device. .
[0003]
However, the multi-forming press apparatus requires a complicated press die and dedicated equipment, and has many processing steps, so that it is difficult to suppress the manufacturing cost.
[0004]
In addition, the double curved surface parts processed by the above method may not be able to be assembled properly to the assembly object due to the problem of stability of the shape accuracy. May affect the functional properties of the finished product.
[0005]
[Problems to be solved by the invention]
This invention considers the fact concerned, and makes it a subject to reduce a manufacturing process, to stabilize a shape dimensional accuracy, and to improve an assembly | attachment precision, without requiring special equipment and a metal mold | die.
[0006]
[Means for Solving the Problems]
In the first aspect of the present invention, in the first step, from the slit port to the tip of the plate material, the shaft is inserted so as to form an annular cavity in the cylindrical body having the slit port formed on the side surface. Insert and lock the part. Next, in the second step, when the cylinder and the shaft are relatively rotated in one direction by a predetermined amount, the plate material is drawn into the shaft, bent along the inner peripheral wall of the cylinder, and bent into a substantially semicircular shape. The end portion is locked to a locking portion formed on the inner peripheral wall of the cylindrical body.
[0007]
Next, in the third step, when the cylindrical body and the shaft are relatively rotated in the other direction by a predetermined amount, the curved portion of the plate material curved in a substantially semicircular shape is folded back and wound around the shaft. Shaped parts are manufactured.
[0008]
For this reason, without using special equipment and molds, the part that is bent so that the two curved surfaces overlap each other by simply locking the tip of the plate to the shaft and rotating the shaft and the cylinder relative to each other, A so-called double curved surface part can be manufactured.
[0009]
In addition, when the cylinder and shaft are used as finished products, the processed plate material is assembled as it is as a double-curved surface part, so there is no error in assembly accuracy and it may affect the functional characteristics of the product. Absent.
[0010]
In the second aspect of the invention, the cylindrical body is fixed and the shaft is rotated by a predetermined amount, and then the cylindrical body is rotated by a predetermined amount in the same direction as the direction in which the shaft is fixed and the shaft is rotated. As a result, the shaft and the cylinder are sequentially rotated in the opposite directions to form a double curved surface shaped part.
[0011]
In the invention described in claim 3, after the third step, the shaft and the double curved surface shaped part are extracted from the cylindrical body.
[0012]
In this way, by mounting the extracted shaft and the plate material processed into a double curved surface shape into another cylindrical body, that is, a cylindrical body as a product having the same shape as the cylindrical body, the assembly accuracy Will improve.
[0013]
In the invention according to claim 4, the shaft is fixed by the hand , the leading end portion of the plate material is inserted from the slit opening formed in the side surface of the cylindrical body, and is locked in the locking groove of the shaft . Next, the fixing of the shaft by the hand is released , the cylinder is fixed by the gripping arm , and the driver rotates the shaft. As a result, the plate material is drawn into the shaft, bent along the inner peripheral wall of the cylindrical body and bent into a substantially semicircular shape, and the rear end portion is locked to a locking portion formed on the inner peripheral wall of the cylindrical body.
[0014]
Next, the fixation of the cylinder by the grip arm is released , the shaft is fixed by the hand , and the drive arm rotates the cylinder in the same direction as the rotation direction of the shaft. As a result, the rear end portion of the plate material curved in a substantially semicircular shape is pushed by the locking portion and rotates together with the cylindrical body, the curved portion is folded and wound around the shaft, and the curved portion is folded. Are wound around the shaft to produce a so-called double-curved part.
[0017]
In the invention according to claim 5 , the second turntable is disposed below the first turntable, and the outer peripheral portions overlap. The second turntable is provided with holding means for holding a cylinder as a product.
[0018]
In addition, a cylindrical case having a slit opening on the side surface is disposed at a predetermined interval on the outer peripheral portion of the first turntable. The first turntable has a penetrating portion so as to communicate with the hollow portion of the case, and the shaft and the bent plate material (double curved surface shaped part) housed in the case can pass through. ing.
[0019]
Then, the shaft and the double curved surface shaped part are loaded from the penetrating part to the other cylindrical body held by the holding means.
[0020]
That is, when the first turntable rotates and the plate material is sequentially bent and a double curved surface part is completed, the hand and the driver are retracted, and the other cylindrical body held by the holding means through the penetrating portion by the pushing means The shaft and the double curved surface shaped part are loaded from the axial direction.
[0021]
In this way, by using a case for bending that has the same shape and high strength as the cylinder as a product, even if the strength of the cylinder as a finished product is small, a double curved surface shaped part with high shape dimensional accuracy Can be assembled.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
First, an energy absorbing plate (hereinafter referred to as “EA plate”) as a double curved surface part processed by the double curved surface part manufacturing apparatus according to the present invention will be described. In addition, this manufacturing apparatus is not limited to the process of EA plate, It can be used for the process of various double curved surface shape components.
[0023]
As shown in FIG. 13, the EA plate 10 has an annular cavity 16 formed between a cylindrical spool 12 constituting a webbing take-up device and a shaft 14 that pivotally supports the spool 12 at both ends. Arranged.
[0024]
The EA plate 10 is a thick metal member that is bent so that two curved surfaces overlap each other. One end of the EA plate 10 is bent along the outer peripheral surface of the shaft 14, and is locked in the locking groove 18. Has been. The curved inner curved surface portion of the EA plate 10 is press-contacted along the outer peripheral surface of the shaft 14 from the locking groove 18, and the outer curved surface portion that is bent and curved over the other end is pressed into contact with the inner peripheral surface of the spool 12. The other end is in contact with a locking portion 20 formed on the inner peripheral surface of the spool 12.
[0025]
The spool 12 is formed with slit ports 22 and 24 that allow the cavity 16 to communicate with the outside along the axial direction. The winding end portion of the webbing W is inserted from the slit port 22, wound around a stop shaft 26 provided in the slit port 24, and the webbing W is fixed to the spool 12. Then, the webbing W is wound around the spool 12 starting from the vicinity of the slit port 22 and rotated integrally with the shaft 14, whereby the webbing W is drawn out and wound up.
[0026]
With this configuration, when the vehicle is suddenly decelerated, the locking means is operated, and when the rotation of the shaft 14 is prevented, the spool 12 rotates in the webbing pull-out direction (arrow A direction) with respect to the shaft 14 by the tensile force of the webbing W. To do. As a result, as shown in FIG. 14, the other end portion is pushed by the locking portion 20 and the EA plate 10 cannot maintain the original shape, and the other end portion is wound around the outer peripheral surface of the shaft 14 and pushed into the locking portion 20. It is done. Thereafter, the rotation of the spool 12 with respect to the shaft 14 is prevented, and the webbing W is pulled out and stopped. Thus, energy applied to the webbing W is absorbed in the process of the plastic deformation of the EA plate 10.
[0027]
Next, the manufacturing apparatus 30 of the 1st form which processes the EA plate 10 demonstrated above is demonstrated.
[0028]
As shown in FIGS. 1, 2, and 4, the manufacturing apparatus 30 includes a circular turntable 32 that is turned by driving means (not shown). Four long grooves 34 narrower than the outer diameter of the spool 12 are formed at equal intervals on the outer peripheral portion of the turntable 32. A pair of substantially semi-ring shaped hands 36 is slidably disposed in the long groove 34. The hand 36 is fixed to the tip of the rod 40 of the piston cylinder 38. By pushing out the hand 36, the shaft 14 that supports the spool 12 placed on the turntable 32 is gripped from both sides, positioned in the center of the long groove 34, and fixed in a non-rotatable manner.
[0029]
Further, a disc (not shown) that rotates integrally with the turntable 32 is provided at the center of rotation of the turntable 32. Four slits are formed at equal intervals on the outer periphery of the disk, and the position of the slit is detected by a photo interrupter. By this signal from the photo interrupter, every time the turntable 32 turns 90 degrees, that is, the spool 12 and the shaft 14 are controlled to stop at the A position, the B position, the C position, and the D position.
[0030]
On the other hand, a driver 42 rotated by a motor (not shown) is disposed above the B position (see FIG. 5). The driver 42 moves downward, the engagement hole 44 engages with the upper end of the shaft 14, and the shaft 14 is rotated about 270 ° counterclockwise.
[0031]
In addition, a gripping arm 46 is provided outside the turntable 32. A gripping surface 46A of the gripping arm 46 is curved in an arc shape in accordance with the outer shape of the spool 12, and the spool 12 is fixed to be non-rotatable by moving in a direction approaching each other. When the turntable 32 turns, the gripping arm 46 moves upward and retracts from the movement locus of the spool 12 and the shaft 14.
[0032]
On the other hand, a drive arm 48 rotated by a motor (not shown) is disposed above the C position (see FIG. 6). The drive arm 48 moves downward, approaches each other, grips the side surface of the spool 12, and rotates the spool 12 counterclockwise by about 180 °.
[0033]
Further, a hand (not shown) that holds the spool 12 and the shaft 14 from above the turntable 32 is disposed at the D position.
[0034]
Next, the operation of the manufacturing apparatus 30 according to this embodiment will be described.
First, as shown in FIGS. 1, 2, and 4, in the position A, the spool 12 supported by the shaft 14 is arranged so that the line connecting the slit port 22 and the slit port 24 is orthogonal to the rod 40. It is placed on the turntable 32. Here, the piston cylinder 38 is driven, and the lower end of the shaft 14 is gripped from both sides by the hand 36 and positioned at the center of the long groove 34 and fixed in a non-rotatable manner.
[0035]
Next, as shown in FIG. 3, a plate material S (a material of a double curved surface part) whose tip is bent into an S-shape is inserted from the slit 24 and locked in the locking groove 18 of the shaft 14. .
[0036]
Next, the turntable 32 is turned 90 ° counterclockwise and stopped at the B position. Here, as shown in FIGS. 2 and 5, the gripping arm 46 descends and moves in a direction approaching each other, thereby fixing the spool 12 so as not to rotate. Next, when the driver 42 moves downward and the engagement hole 44 engages with the upper end portion of the shaft 14, the gripping state of the hand 36 is released, and the shaft 14 is rotated counterclockwise by about 270 °.
[0037]
As a result, the plate material S is drawn into the shaft 14, bent along the inner peripheral wall of the spool 12 and curved in a substantially semicircular shape, and the rear end portion is locked to the locking portion 20 of the spool 12. Here, the driver 42 and the gripping arm 46 are moved upward to retract from the movement locus of the spool 12 and the shaft 14.
[0038]
Next, the turntable 32 is turned 90 ° counterclockwise and stopped at the C position. Here, as shown in FIGS. 2 and 6, the shaft 14 is fixed in a non-rotatable manner by the hand 36. Next, the drive arm 48 moves downward, approaches each other, grips the side surface of the spool 12, and rotates the spool 12 about 180 ° counterclockwise.
[0039]
As a result, the rear end portion of the plate material S curved in a substantially semicircular shape is pushed by the locking portion 20 and rotates together with the spool 12, and the curved portion is folded and wound around the shaft 14. Is formed.
[0040]
Next, the turntable 32 is turned 90 ° counterclockwise and stopped at the D position. Here, as shown in FIGS. 2 and 7, the hand 36 is moved away from each other, and the spool 12 and the shaft 14 on which the EA plate 10 is mounted are gripped by a hand (not shown), and the storage box is removed from the turntable 32. Transfer to
[0041]
As described above, in this embodiment, since the EA plate 10 as a double curved surface part is assembled as it is between the spool 12 and the shaft 14, there is no error in the assembling accuracy and the functional characteristics of the product are affected. There is nothing.
[0042]
In this embodiment, the turntable 32 is stopped at each position, and the shaft 14 or the spool 12 is rotated by the rotating means arranged outside the turntable 32. Means may be provided to process the EA plate 10 during turning.
[0043]
Further, if the spool 12 and the shaft 14 are rotated relative to each other, the EA plate 10 can be processed. Therefore, the spool 12 is fixed and the shaft 14 is first rotated counterclockwise, and then the watch is rotated. You may make it rotate in a direction.
[0044]
Next, the manufacturing apparatus 52 which concerns on a 2nd form is demonstrated.
As shown in FIG. 8, the manufacturing apparatus 52 according to the second embodiment includes a turntable 54 for processing the EA plate 10, and a turntable 55 disposed below the turntable 54 and having outer peripheral portions overlapping each other. It has.
[0045]
A pair of hands 36 for fixing the shaft 14 are arranged at intervals of 90 ° on the outer peripheral portion of the turntable 54 as in the first embodiment. A piston cylinder 58 is disposed on the turntable 54 so as to be orthogonal to the rod 40 that drives the hand 36.
[0046]
A case 60 is fixed to the rod 56 of the piston cylinder 54. The case 60 has the same inner shape as the spool 12 mounted on the turntable 55 when the molds are matched. Can be divided into molds. Further, the turntable 54 has a through-hole 90 slightly larger than the inner diameter of the case 60 on the axis of the case 60 (see FIG. 10).
[0047]
On the other hand, as shown in FIG. 9, a gantry 62 is erected on the turntable 54. A cylinder 64 is attached to the top of the gantry 62, and a motor 68 is fixed to the tip of the rod 66. A driver 72 that engages with the upper end of the shaft 14 is attached to the rotating shaft 70 of the motor 68. Further, at position A, an arm 76 that holds the plate material S and pushes it into the slit opening 74 of the case 60 is disposed.
[0048]
As shown in FIGS. 8 and 10, mounting holes 78 are formed in the turntable 55 at intervals of 120 °. A cap 80 is fitted in the mounting hole 78. An annular flange 82 projects toward the center of the opening of the cap 80 so that the holding pin 86 biased upward by a spring 84 disposed on the cap 80 is prevented from coming out of the cap 80. ing.
[0049]
The holding pin 86 normally protrudes from the mounting surface of the turntable 55 and can be engaged with the shaft support hole 88 of the spool 12.
[0050]
Next, the operation of the manufacturing apparatus 52 according to this embodiment will be described.
First, as shown in FIG. 9, at the position A, the piston cylinders 58 are pressed against each other to mold the case 60. The shaft 14 is inserted into the case 60, the lower ends thereof are gripped from both sides by the hand 36, positioned at the center of the case 60, and fixed so as not to rotate.
[0051]
Next, the arm 76 shown in FIG. 9 is driven, and the plate material S is pushed into the slit port 74 of the case 60, and the tip portion is locked to the locking groove 18 of the shaft 14.
[0052]
Next, the driver 72 first moves downward and engages with the upper end of the shaft 14 until the turntable 54 turns counterclockwise and reaches the D position. Next, the motor 68 is driven to rotate the driver 72, and the shaft 14 is rotated about 270 ° counterclockwise. As a result, the plate material S is drawn into the shaft 14, bent along the inner peripheral wall of the case 60 and curved in a substantially semicircular shape, and the rear end portion is locked to the locking portion 91 of the case 60 in the vicinity of the B position. .
[0053]
Next, the driver 72 is driven to rotate the shaft 14 about 180 ° in the clockwise direction. As a result, the plate material S curved in a substantially semicircular shape is folded back from the tip and wound around the shaft 14, and the EA plate 10 is formed in the vicinity of the C position.
[0054]
Next, the turntable 54 is stopped at the D position. At this time, the shaft support hole 88 of the spool 12 is inserted and fixed to the holding pin 86 protruding from the turntable 55 at the F position, and the spool 12 is pivoted to the D position.
[0055]
Here, as shown in FIGS. 10 to 11, the rod 56 is retracted and the case 60 is divided (in FIG. 11, the case 60 is divided in the front and back direction), and the hand 36 is opened to hold the shaft 14. While releasing the state, the cylinder 64 is driven, and the shaft 14 is pushed into the penetrating portion 90 by the driver 72.
[0056]
At this time, the turntable 55 is turned and stopped so that the spool 12 is positioned on the axis of the penetrating portion 90.
[0057]
As shown in FIG. 12, when the shaft 14 is further pushed in, the shaft 14 passes through the penetrating portion 90 and fits together with the EA plate 10 in the hollow portion of the spool 12 while pushing down the holding pin 86. Here, when the driver 72 is retracted upward, the turntable 55 rotates counterclockwise, and the spool 12 loaded with the shaft 14 and the EA plate 10 is taken in the E position.
[0058]
In this way, by processing the plate material S with the bending case 60 having the same shape and high strength as the spool 12 as a product, even when the strength of the spool 12 as a finished product is low, the shape dimensional accuracy is high. Double curved surface shaped parts can be assembled.
[0059]
Next, in the position D, the case 60 from which the shaft 14 and the EA plate 10 have been extracted is pushed by the piston cylinder 58 during the movement to the position A by turning the turntable 54, and the shaft 60 is aligned again. 14 and plate material S are mounted.
[0060]
In the present embodiment, since the EA plate 10 is processed using the shaft 14 having the flange 93 (see FIG. 12) at the end, the case 60 has to be divided, In the case of a cylindrical shaft that does not have a cylindrical shape, there is no need for splitting when the shaft is extracted, so a cylindrical case can be used.
[0061]
【The invention's effect】
Since the present invention has the above-described configuration, no special equipment or mold is required, and the processing steps can be reduced to stabilize the shape dimension accuracy. Moreover, the assembly | attachment precision of a product can be improved.
[Brief description of the drawings]
FIG. 1 is a plan view showing a double curved surface manufacturing apparatus according to a first embodiment.
FIG. 2 is a plan view showing a state in which a spool and a shaft are set in the double curved surface manufacturing apparatus according to the first embodiment.
FIG. 3 is a perspective view showing a plate material that is a material of an EA plate.
4 is a cross-sectional view at a position A of the double curved surface manufacturing apparatus according to the first embodiment. FIG.
FIG. 5 is a cross-sectional view at a position B of the double curved surface manufacturing apparatus according to the first embodiment.
FIG. 6 is a cross-sectional view at the position C of the double curved surface manufacturing apparatus according to the first embodiment.
FIG. 7 is a cross-sectional view at a position D of the double curved surface manufacturing apparatus according to the first embodiment.
FIG. 8 is a plan view showing a double curved surface manufacturing apparatus according to a second embodiment.
FIG. 9 is a side view of the double curved surface manufacturing apparatus according to the second embodiment at position A.
FIG. 10 is a cross-sectional view showing the movement at the D position of the double curved surface manufacturing apparatus according to the second embodiment.
FIG. 11 is a cross-sectional view showing the movement at the D position of the double curved surface manufacturing apparatus according to the second embodiment.
FIG. 12 is a cross-sectional view showing the movement at the position D of the double curved surface manufacturing apparatus according to the second embodiment.
FIG. 13 is a cross-sectional view illustrating the function of an EA plate.
FIG. 14 is a cross-sectional view illustrating the function of an EA plate.
FIG. 15 is a perspective view showing an EA plate.
[Explanation of symbols]
12 Spool (cylinder)
14 Shaft S Plate material 20 Locking portion 24 Slit port 32 Turntable (first turntable)
36 hand (second turning means)
42 Driver (second turning means)
46 Grasping arm (first rotating means)
48 Drive arm (first rotating means)
54 Turntable (1st turntable)
55 Turntable 60 Case 64 Cylinder (pushing means)
86 Holding pin (holding means)
90 penetration

Claims (5)

A first step of inserting and locking the front end portion of the plate material from the slit port into the locking groove of the shaft inserted so as to form an annular cavity in the cylindrical body having a slit port formed on the side surface; A second step of relatively rotating the cylindrical body and the shaft in one direction until the rear end portion of the plate member is locked by a locking portion formed on an inner peripheral surface of the cylindrical body; and the cylinder in the other direction. And a third step of rotating the body and the shaft relative to each other. In the second step, fixing the cylindrical body and rotating the shaft, and in the third step, rotating the cylindrical body in the same direction as the direction in which the shaft is fixed and the shaft is rotated. The method of manufacturing a double curved surface shaped part according to claim 1. 2. The method for manufacturing a double-curved surface part according to claim 1, wherein after the third step, the shaft and the double-curved surface part are extracted from the tubular body and loaded into another tubular body. A cylinder with a slit opening on the side;
A shaft inserted so as to form an annular cavity in the cylindrical body,
A hand for fixing the shaft when the leading end of the plate material is inserted and locked into the locking groove of the shaft from the slit port;
A driver that rotates the shaft in one direction until the shaft is fixed by the hand and the rear end of the plate is locked to a locking portion formed on an inner peripheral surface of the cylindrical body;
A gripping arm for fixing the cylindrical body when rotating the shaft;
  When the rear end portion of the plate member is locked to the locking portion, the shaft is fixed by the hand, and when the fixing of the cylindrical body by the gripping arm is released, the cylindrical member is rotated in the other direction. A drive arm that winds the shaft around the shaft;
An apparatus for manufacturing a double curved surface part, comprising: A second turntable disposed below the first turntable and having an outer peripheral portion that overlaps, and a cylindrical case disposed on the outer peripheral portion of the first turntable at a predetermined interval and having a slit opening formed on a side surface A shaft that is drilled in the first turntable and communicated with the hollow portion of the case and housed in the case and a penetrating portion through which the curved part can pass through to the second turntable, and the second turn A holding means for holding the shaft that is provided on the table and passes through the penetrating part and a cylinder that is loaded with the double curved surface shaped part, and the shaft that is housed in the case in the cylinder held by the holding means And a pushing means for pushing in the double curved surface shaped part.

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