JP4574289B2 - Method for raising the second spring of the coil spring - Google Patents

Description

  The present invention relates to a second spring raising method of a coil spring, and more specifically, a method of raising and processing a second spring hook of a tension coil spring or a second spring hook of a torsion coil spring. It is about.

  As a technique for raising the second spring hook, for example, there is an invention described in JP-A-11-244974. In the present invention, the leg of the second spring hook is erected at the end of the body coil of the tension coil spring or torsion coil spring formed by abutting the wire fed from the quill with the forming tool. The first spring hook of the coil spring, the body coil and the second spring hook are each processed into a predetermined shape, and then the body coil is gripped by the first gripping means, and the end of the second spring hook is processed. The coil spring material is separated from the wire by cutting the portion into a predetermined length, and the rotational position of the second spring hook around the body coil axis of the coil spring material gripped by the first gripping means is rotationally positioned. The coil spring material is raised by the transfer means and transferred to the processing position, and the body coil half-winding portion connected to the second spring hook is raised and the body coil is made of the core metal. The bending position is regulated by regulating the axial direction of the coil spring, the coil spring material is gripped by the second gripping means in the raised position so that the second spring hook is exposed, the leg raising tool is advanced, and the tip thereof The second spring-hanging leg portion is swung between the leg portion of the second spring hook and the body coil, and the second spring-hanging leg portion is bent and raised in cooperation with the raising core metal. It is a thing.

  However, in this technique, after the first spring hook of the coil spring, the body coil and the second spring hook are each processed into a predetermined shape, the body coil is gripped by the first gripping means, and the end of the second spring hook is Is cut into a predetermined length, separated, transferred to the raising position by the transfer means, re-gripped the coil spring material by the second holding means at the raising position, advanced the leg raising tool, Since the leg is raised and bent and worked in cooperation with the core, in the case of a long spring, it interferes with other parts during transport to the processing position while swinging, and in the case of a short spring, the length of the body coil There is a drawback that it cannot be gripped again due to lack of length. In addition, there is a disadvantage that the posture of the coil spring varies due to an impact when the coil spring is conveyed and a shift in the rotational direction when the body coil is gripped again.

For this reason, in the case of a long spring or a short spring, there are problems that the second spring hook cannot be raised, and that the opposing angles of the first spring hook and the second spring hook vary.
JP 11-244974 A

  The problem to be solved is the provision of a molding method that can cause the second spring hook to be raised at a low cost and with high accuracy in a long spring, a short spring or a torsion coil spring using a tension coil spring.

According to the first aspect of the present invention, in the second spring raising process of the coil spring, a body coil terminal of a tension coil spring or a torsion coil spring formed by abutting a wire fed from a quill with a forming tool. And processing the first spring hook, body coil, and second spring hook of the coil spring into predetermined shapes, and then processing the processed coil spring at that position. gripping the body coil by the gripping means, the second end portion of the spring hook is cut into a predetermined length to separate the coil spring from the wire, bunch second spring hooking the bending position of the gripped coils springs lifting means raised with positioning the distal portion of the core metal, after engaged with the body coil side opposite to the core metal caused the distal end of the second spring hook is advanced the spring hanging raised tool quill shaft Orthogonal to swing and move with a combination of at least two or more and movement of the rotation and the quill axis direction about the pivot and click yl axis about a vertical axis and, caused strained core bar a second spring hook The main feature is to fold the tip of the sword into a fulcrum and raise it.

  According to the second spring-raising method of the coil spring of the present invention, after forming the second spring hook of the coil spring as described above, the body coil portion is gripped by the gripping means at that position, and the end portion of the second spring hook is Is cut into a predetermined length, and the second spring hook is raised and processed, so that there is an advantage that it can be bent and processed with either a long spring or a short spring. In addition, there is no need to lift from the molding position to the machining position, and it is not necessary to re-grasp the body coil, so there is an advantage that the variation in the opposing angle is small without any deviation in the spring's circumferential direction. Furthermore, since it is not necessary to transfer the coil spring, a highly accurate coil spring can be manufactured at low cost.

  Examples 1 and 2 of the present invention will be described in detail below.

  Hereinafter, an embodiment of the second spring raising method of the coil spring of the present invention will be described. FIG. 1 is a front view of a coil spring manufacturing machine, in which the tool operating device is omitted except for the machine base, and FIG. 2 is a view taken along the arrow A in FIG. FIG. 3 is a cross-sectional view showing a portion, FIG. 3 is a view as seen from an arrow B in FIG. 2, and FIG. 4 is a view as seen from an arrow D in FIG. FIG. 5 is a right side portion of the sectional view taken along the line CC in FIG. 6 and 7 are diagrams showing an embodiment of the coil spring forming sequence. FIG. 8 is an explanatory diagram showing the molding operation.

  As shown in FIG. 1, the machine base 1 is formed by integrally forming a machine base 1A for the machine and a machine base 1B for the tool operating device, and cutting, bending, etc. on the machine base 1A for the machine. A unit mounting surface 2 is provided. On the rear side of the unit mounting surface 2, a large gear for driving the unit (not shown) is rotatably supported around the axis of the quill 10 (to be described later). The large gear is rotated by a servo motor via a reduction gear (not shown). It is driven dynamically. Similarly, on the rear side of the unit mounting surface 2, a pair of two pairs of feed rollers are provided above and below the quill axis, and are rotationally driven by another servo motor via a speed reducer. These servo motors are controlled to rotate by an NC control device (not shown).

  On the front surface of the unit mounting surface 2, a quill 10 that guides the wire w on the center line of the large gear is mounted via a quill holder 9 and protrudes. The feed roller at the upper position of the quill axis behind the unit mounting surface 2 is pressurized from above by an air cylinder (not shown) and presses the feed roller at the lower position. The wire w is pressed and clamped by these upper and lower feed rollers, and is fed forward from the quill 10 by the rotation of the feed roller.

  As shown in FIG. 1, units 20 (20 </ b> A, 20 </ b> B, 20 </ b> C, 20 </ b> D, and 20 </ b> E) having the same shape are radially arranged around the quill 10 on the unit mounting surface 2. Each unit 20 includes a slide base 21, a slider 22, and a cam 23 (23A, 23B, 23C, 23D, 23E). Each cam 23 is rotationally driven via a respective small gear (not shown) that meshes with the large gear, and each slider 22 is guided to the slide base 21 via a cam follower driven by the rotation of each cam 23, and the quill 10. It is attached so that it can move forward and backward. The unit 20A includes a clamping tool T13 and a cutting die T16, the unit 20B includes a clamping tool T14 and a raised core T15, the unit 20C includes an upper bending tool T11, the unit 20D includes a lower bending tool T12, and a unit 20E. The cutting tool T17 is attached to the tip of each slider 22. With the unit 20 configured in this manner, each tool moves forward and backward in the direction of the quill 10 at the timing and stroke set by the cam rise of each cam 23.

  On the other hand, on the machine base 1B, as shown in FIGS. 2 and 3, a unit main body 41 having the slide portions 39B of the linear slides 39 and 39 on the lower surfaces of both sides is mounted so as to be able to advance and retract via the rails 39A and 39A. Is placed. The unit body 41 is advanced and retracted by a ball screw 44 that is rotated via a synchro belt 43 by a Z-axis servo motor 42 fixed to the machine base 1B.

  The unit main body 41 is supported by a plurality of bearings so that a hollow rotation shaft 45 is rotatable so as to be concentric with the quill axis, and a large face plate 46 is provided at a tip (quill side end) of the rotation shaft 45. It is attached concentrically and a worm wheel 47 is attached to the center via a key. As shown in FIG. 3, a gear shaft 48 is rotatably supported in the unit main body 41 in the vicinity of the worm wheel 47 in a direction perpendicular to the axis thereof, and a worm 49 that meshes with the worm wheel 47 via a key. Attached. A C-axis servo motor 52 is fixed coaxially to the gear shaft 48 via a support 51 on the lower surface of the unit body 41, and an output shaft 52 a of the C-axis servo motor 52 is connected to the gear shaft 48 via a coupling 53. It is connected with.

  A gear box 60 for a tool holder 50, which will be described later, is attached to an opposite surface of the large face plate 46 to the quill 10 at an eccentric position away from the center, and a Z axis passing through the quill axis line is installed in the gear box 60. An orthogonal vertical shaft 56 is provided so as to be rotatable, and a worm wheel 55 is attached via a key so as to be rotatable about the vertical shaft 56. A tool holding plate 54 is fastened to the vertical shaft 56 by a plurality of bolts on an end surface slightly protruding from the hole 60a of the gear box cover plate.

  As shown in FIG. 4, the tool holding plate 54 is formed in a triangular shape (in this embodiment, a triangular shape, but is formed in a polygonal shape or a circular shape depending on the number of forming tools). The long grooves 54a are engraved radially on the circumference in accordance with the portion, and the forming tool T1, the forming tool T2 (the spring raising tool described in the claims) and the forming tool T3 (the spring engaging described in the claims) are formed in the long groove 54a. The raising tool is detachably fastened by bolts 57.

  In the unit main body 41, a gear shaft 61 is rotatably supported through a plurality of bearings in a central hole of the rotation shaft 45, and a gear 62 is attached to the tip (quill side end) of the gear shaft 61 via a key. The trailing pulley 63 is attached via a key. A drive pulley 66 is fitted on the output shaft 65 a of the B-axis servomotor 65 fixed on the unit main body 41 in parallel with the gear shaft 61 via a support 64. A synchro belt 67 is stretched between the drive pulley 66 and the driven pulley 63.

  As shown in FIG. 5, a gear shaft 68 is supported in the gear box 60 in the vicinity of the worm wheel 55 in a direction perpendicular to the axis of the worm wheel 55 so as to be rotatable, and the worm wheel meshes with the worm wheel 55. 69 is attached by a key. A gear 70 that meshes with the gear 62 is attached to the end of the gear shaft 68 with a key.

  As shown in FIG. 4, the tool operating device 40 configured as described above includes a tool holding plate 54 having a plurality of forming tools T1, T2, and T3, and a vertical axis perpendicular to the quill axis by a B-axis servomotor 65. Rotating about 56 (B-axis rotation), C-axis servomotor 52 can rotate about quill axis (C-axis rotation), and Z-axis motor 42 can perform quill axis direction (Z-axis direction) The B-axis servo motor 65, the C-axis servo motor 52, and the Z-axis servo motor 42 are all driven by an NC controller (not shown).

However, when the tool holder 50 rotates about the quill axis (C-axis rotation), the gear 70 meshing with the gear 62 rotates to rotate the tool holding plate 54. The B-axis servomotor 65 is rotated in synchronization with the C-axis servomotor 52 so that the gear 61 and the gear 62 rotate integrally with the rotation shaft 45 and the large face plate 46, thereby preventing the rotation. .

  Next, the processing operation of the coil spring of this embodiment will be described with reference to each operation explanatory diagram of FIGS. FIG. 6 is a diagram illustrating a process until the first spring hook, the body coil, and the second spring hook of the coil spring are each processed into a predetermined shape. FIG. 7 shows a state in which the coil spring is further gripped at that position, the end of the second spring hook is cut to a predetermined length to separate the coil spring from the wire w, and the second spring hook is bent and processed to obtain a finished product. It is a figure which shows this process. Symbols (a), (b), and (c) in the figure are a front view, a right side view, and a plan view as seen from the front of the quill. Symbols S1, S2,... Are step numbers indicating the order of processes.

  As shown in FIG. 6, in step S <b> 1, the feed roller is rotated to feed the wire rod w, and the straight portion of the first spring hook Wa of the coil spring W is fed out from the tip of the quill 10. Here, the tool holding plate 54 is positioned so that its forming tool mounting surface is vertical and the forming tool T1 is previously positioned approximately 30 degrees upward with respect to the horizontal plane.

  In step S2, the tool holding plate 54 is advanced in the Z-axis direction, and the forming tool T1 is rotated downward on the B-axis to the horizontal position, and comes into contact with the root of the straight portion of the first spring hook Wa protruding from the quill 10. The wire rod w is bent, and further, the feed roller is rotated to feed the wire rod w, and the arc formation of the first spring hook Wa is performed while abutting against the forming tool T1.

  In step S3, when the tool holding plate 54 is retracted in the Z-axis direction and the forming tool T1 is rotated B-axis upward 30 °, the feed roller is rotated and the wire w is the length of the straight portion of the first spring hook. Only sent.

  In step S4, the tool holding plate 54 moves forward in the Z-axis direction and the B-axis is rotated downward until the forming tool T1 reaches the horizontal position, and the wire rod w of the linear portion w of the first spring hook Wa protruding from the quill 10 is obtained. The wire w is bent in contact with the base, and the feed roller is further rotated to feed the wire w, and arc formation of the rising portion of the first spring hook Wa is performed while abutting against the forming tool T1.

  In step S5, after the tool holding plate 54 is retracted in the Z-axis direction, the upper bending tool T11 and the lower bending tool T12 attached to the tips of the sliders 22 are moved forward by the operations of the units 20C and 20D to advance the first spring hooking Wa. Bending process is performed.

  In step S6, the upper bending tool T11 and the lower bending tool T12 are retracted by the operations of the units 20C and 20D.

  In step S7, when the tool holding plate 54 moves forward in the Z-axis direction and the forming tool T1 comes into contact with the wire rod w, the feed roller is rotated to feed the wire rod w, and the body coil is engaged with the forming tool T1. , The set number of turns is wound while extending to the left side (left side in the figure (a) of step S7) toward the tip of the quill perpendicular to the quill axis.

  In step S8, the tool holding plate 54 is retracted in the Z-axis direction and the forming tool T1 is rotated B-axis upward to the 30 ° position, the feed roller is rotated and the wire rod w is fed to the second spring hook Wc. A straight portion is formed.

  In step S9, the tool holding plate 54 advances in the Z-axis direction, the forming tool T1 rotates B-axis downward by 30 ° to the horizontal position, the feed roller is rotated, the wire w is fed, and the second spring hook Wc A hook portion is formed.

  In step S10, the tool holding plate 54 is retracted in the Z-axis direction, the feed roller is rotated, the wire w is fed for a predetermined length, and the end cutting position of the second spring hook Wc is positioned. In the process so far, the first spring hook Wa of the coil spring is formed and bent, and the body coil and the second spring hook Wc are formed, and then only the second spring hook Wc is bent and raised. Become.

  Next, as shown in FIG. 7, in step S11, the tool holding plate 54 rotates about the B and C axes, the forming tool T1 facing the quill 10 is changed to the forming tool T2, and the tool holding plate 54 is attached to the forming tool. The surface is positioned horizontally. A groove having a radius slightly larger than the radius of the wire w is formed on the outer periphery of the tip of the forming tool T2. A wire w is engaged with the groove, and a force is applied to the wire w.

  In step S12, the operations of the unit 20A and the unit 20B advance the clamp tool T13 and the cutting die T16 attached to the tips of the sliders 22 as well as the clamp tool T14 and the raising core metal T15. By this advancement, the body coil of the coil spring is positioned and held by the clamp tool T13 and the clamp tool T14, and at the same time, the cutting teeth of the cut die T16 are positioned at the end cutting position of the second spring hook Wc, and the raising core T15 The front end portion T15a is positioned at the bending position of the second spring hook Wc. Thereafter, the cutting tool T17 attached to the tip of the slider 22 moves forward by the operation of the unit 20E, and in cooperation with the cutting die T16, cutting is performed at the end cutting position of the second spring hook Wc. Separated from.

  In step S13, the cutting tool T17 is retracted by the operation of the unit 20E. Thereafter, the tool holding plate 54 is advanced in the Z-axis direction, and the tip end portion of the forming tool T2 is inserted at a position opposite to the raising core metal T15 of the second spring hook Wc, that is, at a position P1 in FIG.

In step S14, the tool holding plate 54 rotates by the set amount B axis toward the second spring hook Wc and slightly moves toward the Z-direction quill 10 side. By these operations, the wire w of the second spring hook Wc is engaged with the groove at the tip of the forming tool T2, and the second spring hook Wc is bent in the axial direction of the coil body while being pushed in the direction of the quill 10. This is because the tip end of the forming tool T2 moves in a circular arc around the vertical axis 56 perpendicular to the quill axis line by rotating the B axis toward the second spring hook Wc of the tool holding plate 54, so that the quill axis direction (Z axis direction) And the second spring hook Wc is bent in the axial direction of the coil body due to the latter displacement. At the same time, because the former displacement also displaces to the opposite side of the quill 10 in the Z-axis direction, the tool holding plate 54 needs to move to the Z-axis direction quill 10 side to correct it.

  In the case of this embodiment, as shown in the drawing of step S11 (b), the wire direction of the straight portion of the bent-up portion of the second spring hook Wc is not perpendicular to the quill axis direction, but the angle formed by it. Is θ, and slightly falls to the opposite side of the quill 10. Therefore, in order to bend and process the second spring hook Wc so as to be parallel to the axis of the coil body, it is necessary to tilt the second spring hook toward the quill 10 side. For this purpose, the tool holding plate 54 needs to move further to the Z direction quill 10 side. For these two reasons, the tool holding plate 54 is slightly moved to the Z-direction quill 10 side.

  As a result of the rotation in the B direction and the movement in the Z direction, the forming tool T2 turns while hooking the second spring hook Wc of the coil spring in the groove at the tip, and tilts to the quill 10 side. As a result, the second spring hook Wc is , With the tip T15a of the raised core T15 as a fulcrum, it is bent halfway in the direction parallel to the axis of the coil body. At this time, in FIG. 8, the tip position of the forming tool T2 moves from P1 to P2.

  In step S15, the tool holding plate 54 rotates about the quill axis O toward the second spring hook Wc by the set amount C axis. With this rotation, the position of the forming tool T2 moves from P2 to P3 in FIG.

  In step S16, the tool holding plate 54 is further rotated by the set amount B-axis toward the second spring hook Wc, and the tool holding plate 54 is slightly moved toward the Z-direction quill 10 side. As a result of the B-axis rotation and the Z-direction advance, the forming tool T2 swivels while hooking the second spring hook Wc of the coil spring in the groove at the tip, and tilts to the quill 10 side. As a result, the second spring hook Wc is raised. A further set amount is bent in a direction substantially parallel to the axis of the coil body with the tip T15a of the core metal T15 as a fulcrum. At this time, the tip position of the forming tool T2 moves from P3 to P4 in FIG.

  In step S17, the tool holding plate 54 rotates B-axis and C-axis to the opposite side of the second spring hook Wc and retracts in the Z-axis direction. By this rotation and retraction, the tool holding plate 54 returns to the same position as step S11.

  In step S18, the clamping tool T13 and the cutting die T16, and the clamping tool T14 and the raising core T15 are moved backward by the operations of the unit 20A and the unit 20B. Furthermore, the tool holding plate 54 rotates about the B and C axes, and the forming tool T2 facing the quill 10 is changed to the forming tool T1 facing the quill 10 in the direction of 30 °. The forming tool mounting surface of the tool holding plate 54 is positioned vertically. As a result, these tools return to the same positions as in step S1. Along with this, the coil spring W is released and discharged. Then, the process returns to step S1 of the next cycle and is repeated.

  FIG. 9 is a diagram showing another embodiment (embodiment 2) of the coil spring forming sequence. In the second embodiment, the apparatus differs from the first embodiment only in the cut die T16 and the raising core metal T15. In the second embodiment, the symbols are the cut die T16 'and the raising core T15', and the description of the apparatus is omitted. Since the process is the same up to step S8, the description thereof is omitted, and after step S8, step S21 is assumed to distinguish from the first embodiment.

  The difference from the first embodiment is that, in the first embodiment, the wire material direction at the end of the second spring hook Wc and the wire material direction of the bent-up portion have an angle of θ and are approximately orthogonal, but in the second embodiment, they are parallel. This is the case. As a result, the ridgelines of the tip portions T15a and T15'a of the raising cores T15 and 15 'for bending are parallel to the quill axis in the former and perpendicular to the quill axis.

  After step S8 in FIG. 6, although not shown, in step S21, the tool holding plate 54 advances in the Z-axis direction as in step S9, and the forming tool T1 rotates B-axis downward by 30 ° to the horizontal position. The feed roller is rotated to feed the wire rod w. However, in the case of the second embodiment, unlike the first embodiment, the wire w is fed until the wire material direction at the end of the second spring hook Wc 'of the coil spring and the wire material direction of the straight portion of the bent-up portion are parallel. Further, although not shown, in step S22, the tool holding plate 54 is retracted in the Z-axis direction, the feed roller is rotated, and the wire w is fed by a predetermined length. As a result, as shown in FIG. Two spring hooks Wc ′ are formed, and the end cutting position of the second spring hook Wc ′ is positioned. Up to this step, the first spring hook, the body coil, and the second spring hook Wc ′ of the coil spring are each processed into a predetermined shape, and only the second spring hook Wc ′ is bent and raised.

  As shown in FIG. 9, in step S23, the tool holding plate 54 rotates about the B and C axes, the forming tool T1 facing the quill 10 is changed to the forming tool T3, and the forming tool mounting surface of the tool holding plate 54 is changed. Positioned horizontally. An inclined surface T3a is formed in a wedge shape at the tip of the forming tool T3, and a groove having a radius slightly larger than the radius of the wire w is formed in the inclined surface T3a in the longitudinal direction. This groove is formed at a position where the groove engages with the straight portion of the bent raised portion of the second spring hook Wc ′ when the forming tool T3 moves forward.

In step S24, the operations of the unit 20A and the unit 20B advance the clamp tool T13 and the cutting die T16 ′ attached to the tips of the sliders 22 as well as the clamp tool T14 and the raising core T15 ′. By this advancement, the body coil of the coil spring is positioned and held by the clamp tool T13 and the clamp tool T14, and at the same time, the cutting teeth of the cut die T16 ′ are positioned at the end cutting position of the second spring hook Wc ′, and the raising core The tip T15′a of the gold T15 ′ is positioned at the bending position of the second spring hook Wc ′. Thereafter, by the operation of the unit 20E, the cutting tool T17 attached to the tip of the slider 22 moves forward, and in cooperation with the cutting die T16 ′, cutting is performed at the end cutting position of the second spring hook Wc ′. Is separated from the wire w.

  In step S25, the cutting tool T17 is retracted by the operation of the unit 20E. Thereafter, the tool holding plate 54 moves forward in the Z-axis direction, the groove at the tip of the forming tool T3 is positioned on the side opposite to the raising core bar T15 ′ of the second spring hook Wc ′, and the second spring hook Wc ′ Engages with the wire w in the bent straight line portion.

  In step S26, the tool holding plate 54 is rotated by a set amount B-axis toward the second spring hooking side. As a result, the second spring hook Wc 'is bent by a set amount in the axial direction of the coil body with the tip T15'a of the raised core T15' as a fulcrum.

  In step S27, the tool holding plate 54 advances by a set amount in the Z-axis direction. As a result, the bent straight portion of the second spring hook Wc 'is bent by a set amount so as to be parallel to the axis of the coil body with the tip end portion T15'a of the raised core T15' as a fulcrum.

  In step S28, the tool holding plate 54 retreats in the Z-axis direction and rotates along the B and C axes so that the forming tool T3 facing the quill 10 faces the quill 10 in the 30 ° direction. Simultaneously with the change to T1, the forming tool mounting surface of the tool holding plate 54 is positioned vertically. Then, the clamp tool T13 and the cutting die T16 ', and the clamp tool T14 and the raising core T15' are moved backward by the operations of the unit 20A and the unit 20B. As a result, these tools return to the same positions as in step S1. Along with this, the coil spring W is released and discharged. Then, the process returns to step S1 of the next cycle and is repeated.

  The tool actuating device 40 rotates around a vertical axis orthogonal to the quill axis (B axis rotation), rotates around the quill axis (C axis rotation), and moves in the quill axis direction (Z axis). 3 movements are possible. Using this tool actuating device 40, as in the case of the first embodiment, the second spring hook Wc substantially perpendicular to the quill axis is provided with the ridge line of the tip T15a of the raised core T15 parallel to the quill axis as a fulcrum. If it is attempted to bend and raise 90 ° or more, the forming tool T2 cannot be detached from the second spring hook Wc in the middle only by the B-axis rotation, and the quill axis is centered only by the C-axis rotation. Because of the rotation, the forming tool T2 is detached from the second spring hook Wc on the way, which is impossible. However, in the invention of the method of the present application, rotation about the vertical axis perpendicular to the quill axis (B axis rotation), rotation about the quill axis (C axis rotation), and movement in the quill axis direction In the tool operating device provided with the forming tool T2 capable of controlling the (Z-axis movement), the B-axis rotation and the C-axis rotation are appropriately combined to enable a bending and raising process of 90 ° or more. Further, if necessary, by controlling the movement of the forming tool T2 in the quill axis direction (Z-axis movement), the second spring hook Wc is tilted toward the quill 10 and parallel to the axis of the coil body in the plane including the quill axis. It can be made.

  Also in the case of Example 2, the second spring hook Wc ′ is bent and raised by 90 ° or more in the axial direction of the coil body with the ridgeline of the tip T15′a parallel to the quill axis of the raised core T15 ′ as a fulcrum. If processing is to be performed, the forming tool T3 cannot be disengaged from the second spring hook Wc ′ in the middle of the B-axis rotation alone. In the method invention of the present application, rotation about a vertical axis orthogonal to the quill axis (B axis rotation), rotation about the quill axis (C axis rotation), and movement in the quill axis direction (Z In a tool operating device provided with a forming tool T2 capable of axial movement), bending up to 90 ° or more is possible by appropriately combining B-axis rotation and Z-axis movement.

  As described above, in Examples 1 and 2, the ridge lines of the tip portions T15a and T15′a of the raising core bars T15 and 15 ′ for bending are parallel to the quill axis line or orthogonal to the quill axis line. May be the angle. Further, the wire material direction of the end of the second spring hook Wc of the coil spring and the wire material direction of the straight portion of the bent-up portion are approximately orthogonal in the first embodiment and parallel in the second embodiment. This can also be applied by controlling the amount of movement of the tool holding plate 54 in the Z direction in steps S14 and S16, for example. Moreover, although the tension coil spring has been described in the embodiment, the present invention can also be applied to the bending raising process of the second spring hook of the torsion coil spring. Further, in the first and second embodiments, in order to provide versatility, a tool operating device in which the C-axis rotation center coincides with the quill axis is used, but this C-axis rotation center passes through P1 and P4 in FIG. If a dedicated tool actuating device is used at the center of the circle, the second spring hook Wc can be bent and moved by moving from P1 to P4 at a time.

  As described above, the second spring raising method of the coil spring according to the present invention is such that after the first spring hook of the coil spring, the body coil and the second spring hook are formed, the body coil portion is held at that position by the gripping means. Since it is gripped and the end of the second spring hook is cut to a predetermined length and the second spring hook is raised and processed, there is no need to raise and process the second spring hook as in the prior art. Therefore, as in the case of conventional long springs, there is a problem that the coil length is limited due to interference with other parts due to movement, and the position shift is caused by re-gripping or moving the coil spring for movement. There is an advantage that a coil spring having a small variation in the opposing angle can be manufactured without any problem in the circumferential direction of the spring. Further, as in the case of a short spring, the problem that the coil spring cannot be re-gripped and the second spring hook cannot be raised and moved to the processing position is solved. In this way, there is an advantage that the long and short springs can be bent and processed. Furthermore, since it is unnecessary to transfer the coil spring, the apparatus is simplified, and there is an effect that a highly accurate coil spring can be manufactured at low cost.

Front view of coil spring manufacturing machine 1 is a cross-sectional view showing the main part of the tool operating device with the coil spring manufacturing part omitted, as viewed from the direction of arrow A in FIG. B arrow view of FIG. View from arrow D in FIG. The right side of the cross-sectional view taken along the line CC in FIG. The figure which shows the formation order of the coil spring in Example 1, 2, Comprising: The figure which shows the process before bending raising processing of a 2nd spring hook It is a figure which shows the formation order of the coil spring in Example 1, Comprising: The figure which shows the process of bending raising process of a 2nd spring hook Explanatory drawing showing molding operation The figure which shows the formation order of the coil spring in Example 2, Comprising: The figure which shows the process of bending raising process of a 2nd spring hook

Explanation of symbols

1 machine 2 unit mounting surface 10 quill 20 (20A, 20B, 20C, 20D, 20E) unit 21 slide base 22 slider 23 (23A, 23B, 23C, 23D, 23E) cam 39, 39 linear slide 40 tool operating device T1, T2, T3 Forming tool T11 Upper bending tool T12 Lower bending tool T13 Clamping tool T14 Clamping tool T15, T15 'Raise core T16, T16' Cut die T17 Cutting tool W Coil spring Wc, Wc 'Second spring hook w Wire rod

Claims (1)

A method of raising and processing a second spring hook on a body coil terminal portion of a tension coil spring or a torsion coil spring formed by abutting a wire fed from a quill with a forming tool, After the spring hook, the body coil, and the second spring hook are each processed into a predetermined shape, the body coil of the processed coil spring is gripped by gripping means at that position, and the end of the second spring hook is set to a predetermined length. Cut and separate the coil spring from the wire, raise the coil spring held by the holding means to the bent position of the second spring hook , position the tip of the core metal, and advance the spring hook tool after the said raised metal core of the tip end portion the second spring hook engaged with the body coil side opposite to the a pivotal movement around a vertical axis perpendicular to the quill axis quill shaft The by a movement of rotation and the quill axis direction centered swung and moved while a combination of at least 2 or more, characterized in that the processing caused by bending the second spring hooking the fulcrum end portion of the raised metal core The 2nd spring raising processing method of a coil spring.

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