JPH062296B2 - Spring forming method and apparatus - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring forming method and apparatus in which a wire to be sent out is made to collide with a forming tool to form a coil portion, an arc of a hook or a bent portion.

2. Description of the Related Art Conventionally, for forming a spring of this type, for example, in forming a torsion coil spring having a hook portion that is not located on the same plane, the arc portion of the first hook portion, the inflection portion from the first hook portion to the coil portion, The body portion of the coil, the rising portion of the second hook portion, the arc portion of the second hook portion, and the like are formed separately by a plurality of forming tools radially arranged so as to be able to move forward and backward. It was

Problems to be Solved by the Invention For this reason, a large number of forming tools are required, and each has a unit structure, which increases the price and controls the number of attaching tools on the front mounting plate to control the number of forming tools to form hooks of complicated shapes. However, there is a problem that the mechanism is complicated and the mechanism is complicated.

Means for Solving the Problems In a method of manufacturing a coil spring by advancing a forming tool to the front surface of a wire rod fed from a quill, the direction of the forming surface of one forming tool faces the direction of forming the wire rod. To form a hook portion and a coil portion that are not located on the same plane by swiveling around the axis of the quill, and further swiveling the shaping surface in a plane including the axis of the quill and abutting the wire material to be fed. Is.

Further, in a spring forming device in which a forming tool advances to the front surface of a wire rod fed from a quill and collides the wire rod to form a coil portion and a hook portion, the forming tool can be pivotally positioned about the axis of the quill, and A first driving means is provided so as to be pivotally positionable in a plane including the axis of the quill, and a first driving unit that pivots the forming tool around the axis of the quill is provided, and the forming tool is pivoted in the plane including the axis of the coil. A second driving means is provided so as to advance to the front surface of the wire to be fed, and a means is provided for associating the first driving means and the second driving means so as to operate in synchronization with the wire feeding.

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 In FIGS. 1 to 9, a tool mounting frame 2 and a box frame 3 behind the tool mounting frame 2 are provided on a machine base 1, and the tool mounting frame 2 is provided.
A large gear 5 for rotating a forming tool and a large gear 4 for rotating a cam for rocking the forming tool are rotatably and concentrically supported in each. The box frame 3 includes a speed reducer 6 for rotating the large gear 4, a servo motor 7 for driving the same, a speed reducer 8 for rotating the large gear 5, a servo motor 9 for driving the speed reducer 10 and a speed reducer 10 for rotating a feed roller. A servo motor 11 that drives it is built in. Then, these servo motors are controlled by an NC controller (not shown).

On the front surface of the tool mounting frame 2, there is a quill 12 whose tip is located on the center line of the large gears 4 and 5 and which guides the wire rod.
It is mounted in the radial direction by means of 3, and a delivery roller 14 is arranged below the quill center line and a pressing roller 15 is arranged above the quill center line. Sending roller 1
Reference numeral 4 has a V groove on its circumference, is rotatably supported by a mounting base 13, and is rotated by a speed reducer 10 from a servo motor 11. The pressing roller 15 is rotatably supported by a block supported by the mount 13 so as to be vertically movable.
The spring 17 is provided so as to be adjustable in compression amount and is pressed against the feed roller 14 by a spring 17 interposed between the spring 16 and the receiver 16. Then, the wire wound on the hoop is sandwiched by the upper and lower rollers and sent out from the quill 12.

Further, a cutting device 20 for cutting the wire rod fed from the quill 12 at a desired position is attached in a radial direction toward the centers of the large gears 4 and 5. That is, the sliding member 22 is fitted on the guide base 21 mounted near the center in the radial direction, and the tool holding member 23 is provided in the radial groove of the sliding member 22 so that the position can be adjusted in the radial direction. A cutting tool CT having a cutting surface aligned with the surface of the quill 12 is replaceably provided at the inner end of the tool holder 23. Sliding body 22
A cam follower 25 is pivotally supported at the outer end of the and the two spring tension pins 26 are planted. A cam 24 is fixed to the shaft of a small gear that is supported by the tool mounting frame 2 and that meshes with the large gear 5, and the cam 24 contacts the cam follower 25 of the cutting device 20. A spring 30 is stretched between a pin 26 that is planted in the sliding body 22 for contacting the cam follower 25 and two pins 29 that are planted on the front surface of the tool mounting frame 2.

Further, the molding device 40, which is the main point of the present invention, is installed on the same line so as to face the front quill 12 of the tool mounting frame 2. The molding device 40 is formed into a unit, and the unit base 41 thereof has a sliding guide surface 41a in the radial direction, and a tool operating base 42 is slidably provided on the sliding guide surface 41a. The tool control console 42 has a quill 1 center line.
A quill-side tip portion is formed in a diametrical direction on the same line as the center line 2 of FIG. 2 and a tool holder 43 is inserted into the groove 45a, and the center thereof is pivotally supported by a support shaft 44 on the center line.
5 is rotatably supported by bearings. Control tube 4
An operating rod 46 is fitted in the center hole 45b of the bearing 5 through a slide bearing so as to be rotatable and axially movable. The L-shaped bent portion 46a at the tip of the quill side of the operating rod 46 and the end of the tool holder 43 are pivotally coupled to a pin 48, 49 so as to be pivotally coupled by a coupling plate 47, respectively. The other end of the tool holder 43 is replaceably attached to the engaging groove 43a. The forming tool T has a forming surface Ta formed on the surface facing the quill, which is inclined with respect to the axis. The operating rod 46 is supported at its center by a bracket 50 attached to the tool operating base 42, and its rear end is squared so as to be cut into a square rod 46c. A male screw 46b is engraved on the square rod 46c. It is set up. A worm gear 51 having a square hole is fitted to the square rod 46c so as to be movable relative to each other, and the worm gear 51 is rotatably supported by a bearing on a bracket 52 fastened to the tool mounting frame 2. A worm 53 meshing with the worm gear 51 is rotatably supported by a bearing on the bracket 52.
4, the shaft 54 has a pulley 55 keyed to the end protruding from the bracket 52. Then, a meshing small gear 56 is keyed to the large gear 5 and a pulley 55 is rotated via a belt from a pulley 58 at the end of a shaft 57 supported by a bearing of the tool mounting frame 2. A follower mounting plate 62 that rotatably supports a cam follower 60 right below the operation rod 46 with a small shaft 61 perpendicular to the operation rod 46 is provided on the threaded portion 46b of the operation rod 46 so that the axial position is adjustable and relative rotation is possible. Has been. Both ends of the follower mounting plate 62 are supported by the unit base 41 and the bracket 52, and are guided by the guide rods 63 arranged on both sides in parallel with the operating rod 46.

Further, on the tool operating base 42, a cam follower 65 is provided on the side facing the cam follower 60 with a small shaft 64 perpendicular to the operating rod 46.
And the gear wheel 4 together with the cam follower 60.
It is controlled by a cam that rotates. That is, between the tool operating base 42 and the bracket 52, the bracket 66, which is concentric with the window 2a at the mounting position between the cam followers 60 and 65 and is fastened between the tool mounting frames 2, is perpendicular to the mounting surface, that is, the tool operating base 42. A gear shaft 67 is rotatably supported by bearings in a direction perpendicular to the sliding direction, and a gear 68 keyed to the lower end of the shaft meshes with the large gear 4. Also, this gear shaft 67
A disc cam 69 is keyed to the upper end of the disc cam 69 and is in contact with the cam follower 65. Further, a disc cam 70 concentrically fastened to the boss portion of the disc cam 69 is in contact with the cam follower 60. Then, the follower mounting plate 62 and the tool operation console 42
Disk cams 69, 70 by springs not shown respectively.
The cam followers 65 and 60 are always in contact with each other.

The manufacture of the torsion coil spring as shown in FIG. 9 will be described with reference to FIG. 7 showing an operation control diagram and FIG. 8 showing each stroke. The delivery roller 14 is rotated by the servomotor 11 in response to a command from an NC device (not shown), and the hook end linear portion (a) of the spring is delivered. Next, the small gear 68 is rotated by the large gear 4 rotated by the servo motor 7 in response to a command from the NC device, and the disc cams 69 and 70 are rotated via the gear shaft 67. The cam surface of the disc cam 69 acts first as shown in FIG. 7 to move the tool operating base 42 through the cam follower 65 to the quill 1.
Move forward to side 2. With this forward movement, the operation tube 45 moves the forming tool T.
At the same time, it is advanced from the molding preparation position to the molding standby position.
The disc cam 70 acts with a delay, and the cam follower 60 retracts the follower mounting plate 62 and retracts the operating rod 46.
Therefore, the connecting plate 47 causes the tool holder 43 to rotate about the support shaft 44, and the forming tool T at the retracted position (the imaginary line in FIG. 8A) to rotate about the support shaft 44 and advances to the front surface of the quill 12. (FIG. 8A), the molding surface Ta collides with the wire material to be delivered to form the bent portion (b) of the first hook 1 /
After the four-circle forming, the disc cam 70 is made inoperative, the operating rod 46 is moved forward, and the forming tool T is turned in the reverse direction to return to the retracted position. At this time, since the cam working surface of the disc cam 69 is wide, it is in the working position.

Then, according to a command from the NC device, the large gear 5 is driven by the servo motor 9.
To rotate the small gear 56, shaft 57, pulley 58.5
5. Rotate the worm gear 51 through the worm 53 by 90 °. This 90 ° rotation causes the operating rod 46 to move the operating cylinder 45.
The tool holder 43 and the forming tool T are turned by 90 ° and turned by 90 ° about the quill axis (FIG. 8B). Further, the delivery roller 14 is rotated by the servo motor 11 to deliver the wire material and form a straight line portion (c) of the engaging portion of the first hook.

The servomotor 7 is rotated in the reverse direction, the large gear 4 is rotated in the reverse direction, the disk cam 69 returns on the cam action surface and continues to contact the cam follower 65, and keeps the tool operation No. 42 in the advanced forming standby position. The plate cam 70 returns to the cam action surface again and retracts the operating rod 46 via the cam follower 60 and the connecting plate 62. For this reason, the tool holder 43 and the forming tool T are swung to advance to the front surface of the quill 12 from the direction deviated by 90 ° from the previous time and collide with the wire material to be sent out to form a bent portion (d) (Fig. 8). C) After the 1/4 circle forming, the disc cam 70 becomes inoperative, and the operating rod 46 is moved forward so that the forming tool T is rotated backward about the support shaft 44 to the retracted position. The disc cam 69 continues to be located on the camming surface. The servo motor 9 is rotated, the large gear 5 is rotated, and the worm gear 51 is further rotated in the same manner.
Turned 90 °. As a result, the operating cylinder 45 and the forming tool T are further swung 90 ° about the quill shaft (FIG. 8D). Further, the delivery roller 14 is rotated by the servo motor 11 to deliver the wire material to form the straight portion (e) of the leg of the first hook.

The servomotor 7 is rotated forward and the small gear 6 is rotated by the large gear 4.
8. The disc cams 69 and 70 are rotated. The disc cam 70 has its cam working surface reversely returned in the forward rotation direction, and the disc cam 69 has its cam working surface reversely returned in the forward rotation direction to retract the operating rod 46 and rotate the forming tool T from 90 °. The quill 12 is swiveled around the support shaft 44. The servo motor 11 is rotated to rotate the feed roller 14, and the wire material is fed from the quill 12 to abut against the forming surface Ta of the forming tool T to form the coil body portion (f) (FIG. 8E). If the coil body portion is long, the rotation of the servo motor 7 is stopped as necessary to keep the disc cams 69, 70 at the working surface position. When the required number of coil turns is formed, the disk cam 70
Becomes inactive and the operating rod 46 is advanced to move the tool holder 4
3. The forming tool T is turned to the retracted position. Disk cam 6
9 continues to be located on the cam working surface.

Rotate the servomotor 9 to rotate the large gear 5 to the worm gear 5
1 is further swung 90 ° around the quill axis, and the operating rod 46, the tool holder 43, and the forming tool T are further swung 90 ° around the quill axis.
Rotate (Fig. 8F). During this time, the feed roller 14 is rotated by the rotation of the servo motor 11 to form the straight portion (g) of the leg of the second hook.

The servomotor 7 is rotated in the reverse direction and the disc cam 6 is rotated from the large gear 4.
Rotate 9,70 in reverse. The cam working surface of the disk cam 70 is returned, the disk cam 69 returns on the working surface, the operating rod 46 is retracted, the forming tool T is advanced to the front surface of the quill 12, and the wire rod sent from the quill 12 is abutted against the cam. A / 4 arc is formed to make the disc cam 70 inoperative and the forming tool T to the retracted position (Fig. 8G). The servo motor 9 is rotated to rotate the worm gear 51 from the large gear 5 by 90 ° around the quill shaft, and the forming tool T is rotated about 90 ° around the quill shaft.
° Turned in the turning direction (Fig. 8H). Servo motor 1
1 to rotate the feed roller 14 to rotate the quill 12
Send out the wire and make a straight line (2) at the hooking part of the second hook.

The servomotor 7 is rotated in the forward direction so that the disc cam 6 is rotated from the large gear 4.
Rotate 9,70. The disc cam 69 continues to maintain the cam acting surface, and the disc cam 70 serves as the cam acting surface.
And the forming tool T is swung around the support shaft 44 to advance to the front surface of the quill 12 and collide with the wire material to be sent out to form a 1/4 circular arc (nu) to place the disc cam 70 in the inoperative position. (FIG. 8I).

The servomotor 7 rotates forward to rotate the disc cams 69 and 70 so that both of them serve as cam non-acting surfaces. By the rotation of the servomotor 11, the feeding roller 14 feeds the wire material to form a straight line portion (L) at the end of the second hook. Even if the servo motor 7 continues to rotate, the disc cams 69 and 70 maintain the cam inoperative position.

On the other hand, the cam follower 25 is pushed toward the center by the disc cam 24 attached to the small gear (not shown) that meshes with the large gear 4, and the cutting tool CT advances to the front surface of the quill 12 by the forward movement of the sliding body 22 to remove the wire rod. Cut (Fig. 8J). The disc cam 24 rotates to the cam non-acting position and returns to the initial position, and the disc cams 69 and 70 also return to the initial position. The forming tool T is also retracted and returned to the forming preparation position. One rotation of the small gears 56 and 68 forms one torsion coil spring.

Example 2 FIG. 10 to FIG. 14 will be described.

The mounting position of the molding apparatus 81 is located on the tool mounting frame 2 in the left-right opposite of the first embodiment. The same parts as those in the previous embodiment are designated by the same reference numerals and the description thereof will be omitted. The pressing roller 15 is pressed by the action of the air cylinder through the piston rod when the diameter of the wire is small, and is pressed by the spring force interposed between the piston rods, and when the diameter is large, the spring is killed and directly pressed.

In particular, the molding device 81 whose configuration has been changed is similarly configured as a unit and is mounted on the tool mounting frame 2. A gear shaft 83 is rotatably supported on the unit base 82 by a bearing portion 82a perpendicular to the mounting surface. A small gear 56 that meshes with the large gear 5 as in the previous embodiment is keyed to the protruding end of the gear shaft 83, and a bevel gear 84 is keyed to the other end. A gear shaft 85 is rotatably supported by a bearing on the unit base 82 so as to be orthogonal to the gear shaft 83 and parallel to the mounting surface, and a bevel gear 86 meshing with the bevel gear 84 is keyed to the end of the gear shaft 85. Also, a wide gear 87 is keyed. A guide surface 82b parallel to the gear shaft 85 is formed on the upper surface of the unit base 82, and a tool operating base 88 is slidably mounted on the guide surface 82b. An upper step portion 88a is formed on the quill side of the tool operation console 88, and a stepped operation cylinder 89 whose rotation axis is the sliding direction of the tool operation console 88 is attached to the unit base 82 on the tool attachment frame 2 on the upper step portion 88a. When mounted, it is rotatably supported by a radial ball bearing and a slide bearing so that the shaft center coincides with the quill shaft center, and the thrust bearing receives a reaction force applied to the tool.
A gear 90 is keyed to the small diameter portion 89a of the stepped operation cylinder 89, and a window is bored at the position of the tool operation table 88 with respect to the gear 90, and the window is engaged with the gears 90 and 87. Intermediate gear 91
Is rotatably supported by the support shaft 92. A central hole 89b is bored in the small diameter portion 89a of the stepped operation cylinder 89, and a deep groove 89d is cut in the large diameter portion 89c with a width equal to the diameter of the central hole 89b leaving one surface in the diameter direction. An operating rod 93 is rotatably and axially movably supported in the small-diameter portion 89b through a slide bearing. In the groove 89d of the stepped operation cylinder 89, a tool holder 95 which is biased toward the bottom side of the groove 89d from the axis of the operating rod 93 and slidably engages with the deep groove 89d by the support shaft 94 near the inlet is swingably supported. ing. The tool holder 95 is replaceably mounted on a line parallel to the axis of the operating rod 93 that passes through the support shaft 94 so that the forming tool T having the forming surface Ta on the axis of the operating rod 93 can face the quill 12. In addition, the tool holder end on the side opposite to the support shaft 94 with respect to the axis of the operating rod 93 and the L end of the operating rod 93 are connected by a connecting plate 97. At the rear end of the tool operating base 88, a cam follower 98 is pivotally supported about a shaft 99 perpendicular to the sliding direction, and a bracket 88b is established between the cam follower 98 and the intermediate gear 91, and an axis parallel to the operating rod 93 is provided. The air cylinder 100 having is fixed. The connecting piece 102 fixed to the piston rod 101 of the air cylinder 100 has a needle bearing at the rear end of the operating rod 93,
The thrust bearings are connected so as to be rotatable relative to each other in the axial direction. Then, as the operating rod 93 advances, the tool holder
The large diameter portion 89c of the stepped operation cylinder 89 is provided with a stopper 96 that pivots 95 to position the forming tool T at a predetermined position on the front surface of the quill 12.

Further, a cam shaft 104 is rotatably supported by a bearing in a bearing housing 103 mounted in a mounting hole 2a adjacent to the tool mounting frame 2 in parallel with a gear shaft 83, and the first embodiment is provided at the tip on the same side as the small gear 56. Small gear that meshes with large gear 4
68 is keyed, and two cam plates 105a and 105b are fixed to the other end so that the phase can be adjusted. This cam plate is a composite cam
Form 105.

Furthermore, on the tool mounting frame 2, the unit base 82 and the composite cam
The lever shaft 106 mounted between the synthetic cam 105 and
A lever 107 that conveys the amount of displacement to the cam floor 98 is pivotally supported. And cam follower 98, lever 107, lever 107
A spring 109 for keeping the connection surfaces of the cam follower 108 and the composite cam 105 in contact with each other is stretched between the tool operating base 88 and the pin on the tool mounting frame 2. The unit of the molding apparatus configured as described above is arranged on the tool mounting frame 2 with the pin 110 radially positioned so that the tool faces the quill as shown in FIG.

The manufacture of the torsion coil spring as shown in FIG. 9 will be described with reference to FIG. 15 showing an operation control diagram and FIG. 8 showing each stroke. The delivery roller 14 is rotated by the servomotor 11 in response to a command from an NC device (not shown), and the hook end linear portion (a) of the spring is delivered. Next, the small gear 68 is rotated by the large gear 4 rotated by the servo motor 7 in response to a command from the NC device, and the composite cam 105 of the cam shaft 104 is rotated. Synthetic cam
The cam surface of 105 rotates the lever 107 to advance the tool operating console 88 to the quill 12 side via the cam follower 98. By this advance, the operation tube 89 is advanced together with the forming tool T from the forming preparation position to the forming standby position. When the cam shaft 104 rotates a required angle by a rotation command, pressurized air is sent to the rear chamber of the air cylinder 100, and the piston rod 101 and the connecting piece 102 are moved forward to operate the operating rod.
Advance 93. Therefore, the connecting plate 97 rotates the tool holder 95 about the support shaft 94, and the forming tool T at the retracted position (phantom line in FIG. 8A) about the support shaft 94 and advances to the front of the quill 12. Then, the molding surface Ta collides with the wire material to be sent out to form the bent portion (b) of the first hook, and after the 1/4 circle molding, the pressure air of the air cylinder 100 is switched to the front chamber and the piston rod. 101 and the connecting piece 102 are retracted, the operating rod 93 is retracted, and the forming tool T is reversely rotated to return to the retracted position. At this time, since the cam working surface of the synthetic cam 105 is wide, it is in the working position.

Then, according to a command from the NC device, the large gear 5 is driven by the servo motor 9.
Is rotated to rotate the gear 90 ° by the small gear 56, the gear shaft 83, the bevel gears 84 and 86, the gear shaft 85, and the gears 87 and 91. This 90
When the operating cylinder 89 is rotated by 90 °, the operating rod 93 is rotated by 90 °, and the tool holder 95 and the forming tool T are rotated by 90 ° about the quill shaft (FIG. 8B). Further, the delivery roller 14 is rotated by the servo motor 11 to deliver the wire material and form a straight line portion (c) of the engaging portion of the first hook.

The servomotor 7 is rotated in the reverse direction, the large gear 4 is rotated in the reverse direction, the composite cam 105 returns on the cam action surface, the lever 107 continues to contact the cam follower 98, and the tool operation base 88 is kept in the forward standby position. At the predetermined rotation position of the shaft 104, the pressure air of the air cylinder 100 is switched to the rear chamber again, and the piston rod 1
01, the connecting piece 102, and the operating rod 93 are moved forward. For this reason, the tool holder 95 and the forming tool T are swung to advance to the front surface of the quill 12 from the direction deviated by 90 ° from the previous time and collide with the wire material to be sent out to form a bent portion (d) (Fig. 8). C) Switch the pressure air in the air cylinder 100 after 1/4 circle molding.
Is moved backward and the forming tool T is turned backward around the support shaft 94 to the retracted position. The composite cam 105 continues to be located on the camming surface. The servomotor 9 is rotated and the large gear 5 is rotated. Similarly, the small gear 56, the bevel gears 84 and 86, and the gears 87 and 91 rotate the gear 90 by 90 °. This allows the stepped operation tube
89, operating rod 93, forming tool T further centered on the quill axis
It is turned 90 ° (Fig. 8D). Further, the delivery roller 14 is rotated by the servo motor 11 to deliver the wire material to form the straight portion (e) of the leg of the first hook.

The servomotor 7 is rotated forward and the small gear 6 is rotated by the large gear 4.
8. The composite cam 105 is rotated. The composite cam 105 returns to the normal direction as it is on the cam operating surface, and the compressed air of the air cylinder 100 is switched to the rear chamber at a predetermined rotational position of the cam shaft 104 to move the operating rod 93 forward to rotate the forming stroke T 90 °. From the position, the quill 12 is swiveled around the support shaft 94.
The servo motor 11 is rotated to rotate the feed roller 14,
Forming surface T of forming tool T by sending wire from quill 12
The coil body portion (f) is formed by abutting against a (8th).
(Figure E). If the coil body portion is long, the rotation of the servo motor 7 is stopped as necessary to keep the composite cam 105 at the working surface position. When the required number of coil turns is formed, the pressure air in the air cylinder 100 is switched to the front chamber and the operating rod 93
Is retracted to rotate the tool holder 95 and the forming tool T to the retracted position. The composite cam 105 continues to be located on the cam working surface.

The servomotor 9 is rotated to rotate the stepped operation cylinder 89 from the large gear 5 through the gear group further 90 ° around the quill shaft to move the operation rod 93, the tool holder 95, and the forming tool T further 90 around the quill shaft. ° Turn (Fig. 8F). During this time, the feed roller 14 is rotated by the rotation of the servo motor 11 to form the straight portion (g) of the leg of the second hook.

The servomotor 7 is rotated in the reverse direction, and the synthetic cam 105 is fed from the large gear 4.
Turn backwards. The synthetic cam 105 returns on the working surface and switches the pressure air of the air cylinder 100 to the rear chamber at a predetermined rotational position of the cam shaft 104 to move the operating rod 93 forward to move the forming tool T to the quill 1.
The air cylinder 100 is made by advancing to the front of 2 and colliding with the wire sent from the quill 12 to form a quarter arc
The pressure air of is switched to the front chamber and the forming tool T is swung to the retracted position. (Fig. 8G). The servo motor 9 is rotated, and the stepped operation cylinder is operated from the large gear 5 and the small gear 56 through the gear group.
The 89 is further swung by 90 ° around the quill axis, and the forming tool T is turned by 90 ° around the quill axis (Fig. 8H). Servo motor 11 is rotated to feed roller 14
The wire is sent out from the quill 12 by rotating to form a straight line (L) for the hooked portion of the second hook.

The servomotor 7 is rotated in the forward direction, and the composite cam 10 is driven from the large gear 4.
Rotate 5. The synthetic cam 105 continues to keep the cam action surface, and the pressure air of the air cylinder 100 is switched to the rear chamber by a predetermined rotation of the cam shaft 104 to move the operating rod 93 forward to swivel the forming tool T about the support shaft to the front of the quill 12. The wire rod sent out and sent out is made to collide with each other to form a 1/4 arc (nu), the pressure air of the air cylinder 100 is switched to the front chamber, and the operating rod 93 is retracted to set the forming tool T to the retracted position. (Fig. 8I).

The servo motor 7 rotates forward to rotate the composite cam 105 to form a cam non-acting surface. The rotation of the servomotor 11 causes the feeding roller 14 to feed the wire material and form a straight line portion (L) at the end of the second hook. When the servomotor 7 continues to rotate, the composite cam 10
5 keeps the cam inactive position.

On the other hand, the cam follower 25 is pushed toward the center by the disc cam 24 attached to the small gear (not shown) that meshes with the large gear 4, and the cutting tool CT advances to the front surface of the quill 12 by the forward movement of the sliding body 22 to remove the wire rod. Cut (Fig. 8J). Disc cam
24 rotates to the cam non-acting position and returns to the initial position, and the composite cam 105 also returns to the initial position. The forming tool T is also retracted and returned to the forming preparation position. One rotation of the small gears 56 and 68 forms one torsion coil spring.

Third Embodiment In FIG. 16 and FIG. 17 showing the cam drive instead of the air cylinder 100 of the third molding apparatus 81, the same reference numerals are attached to the same related portions and the changed portions will be described.

A roller holder 112 pivotally supporting a cam follower 111 is connected to the rear end of the operating rod 93 by a needle bearing and a thrust bearing so as to be integrally rotatable in the axial direction, and is slidably mounted on the tool operating table 88. There is. A similar composite cam 113 is attached to the upper part of the cam shaft 104 with a predetermined phase with the composite cam 105. Further, the lever shaft 106 has a roller holder 1
A lever 115 that pivotally supports a cam follower 114 that contacts 12 cam followers 111 and a composite cam 113 is pivotally supported.
Therefore, the operation of moving the operating rod 93 forward by the action of the air cylinder 100 is performed by the composite cam 113, and
The same operation as the cam follower of the first embodiment is performed by the forward and reverse rotation of 04.

Effect As described in detail above, the present invention enables one forming tool to be swiveled around the quill axis and can be swung in the plane including the quill axis at the forming position and the retracted position on the front surface of the quill. Various tools can work with one tool and various complicated bending can be performed without being on the same plane, which can significantly reduce the cost of forming tools and tool units and change the shape of the torsion coil spring. Can be easily accommodated. In addition, there is a margin on the tool mounting surface and other accessories can be mounted, which has the effect of supporting a wide range of spring forming.

[Brief description of drawings]

1 is a front explanatory view of a spring forming apparatus of the present invention, FIG. 2 is a partial sectional side view, FIG. 3 is a vertical sectional view of a forming member, FIG. 4 is the same plan view, and FIG. 3 is a sectional view taken along the line AA of FIG. 3, FIG. 6 is a view showing an intermediate shaft from a large gear, FIG. 7 is a view showing time-sharing such as cam wire feed, and FIG. 8 is a view showing a spring forming process. FIG. 9 is a view of an embodiment of a torsion coil spring, (a) is a front view, (b) is a side view, and FIG. 10 is a front explanatory view of a spring forming apparatus of the second embodiment of the present invention, FIG. Is a side view of the same, FIG. 12 is a cross-sectional view of the molding apparatus, FIG. 13 is a view taken along the line BB in FIG. 12, FIG. 14 is a plan view attached to a tool mounting frame, and FIG. , FIG. 16 is a sectional view of a third embodiment of the molding apparatus, and FIG. 17 is a sectional view of the same cam and lever. 2 ・ ・ Tool mounting frame 4,5 ・ ・ Large gear 7,9,11 ・ ・ Servo motor 12 ・ ・ Quill 14 ・ ・ Feeding roller 15 ・ ・ Pressing roller 20 ・ ・ Cutting device 40,81 ・ ・ Molding device 42, 88 ・ ・ Tool operating console 43,95 ・ ・ Tool holder 45,89 ・ ・ Operating cylinder 46,93 ・ ・ Operating rod 51 ・ ・ Worm gear 100 ・ ・ Air cylinder 69,70 ・ ・ Disc cam 105,113 ・ ・ Composite cam 25,60,65,98,108,114 ・ ・ Cam follower T ・ ・ Molding tool CT ・ ・ Cutting tool

Claims (2)

[Claims] 1. A method for producing a coil spring by advancing a forming tool to the front surface of a wire rod fed from a quill,
The shaping surface of one shaping tool is swung about the axis of the quill so that the direction of the shaping surface faces the direction of shaping the wire, and the shaping surface is swung in a plane including the axis of the quill and hits the wire to be fed. A spring forming method, characterized in that a hook portion and a coil portion which are not located on the same plane are formed by doing so. 2. A spring forming apparatus in which a forming tool advances to the front surface of a wire rod fed from a quill to collide with the wire rod to form a coil portion and a hook portion, and the forming tool is rotated about the axis of the quill. Positioning is possible and swivel positioning is possible in a plane including the axis of the quill, and first driving means for swiveling the shaping tool about the axis of the quill is provided, and the shaping tool is in the plane including the axis of the quill. Second driving means for swiveling and advancing to the front surface of the wire to be fed out, and means for associating the first driving means and the second driving means so as to operate in synchronization with the wire feeding. Spring forming device.