JPH067970B2 - Spring forming equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring forming apparatus in which a wire material to be sent out is collided 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 example, a torsion coil spring is manufactured by a spring forming machine of a type in which a diameter is determined in consideration of a springback amount of a wire material with respect to a coil diameter and a wire material to be fed around a cored bar is wound.

Also, in a forming tool of a spring forming apparatus having a plurality of forming tools radially arranged so as to be able to advance and retreat around a wire rod to be sent out, an arc portion of the first hook portion, and a curved portion from the first hook portion to the coil portion. ， Coil body part and second
The rising part of the hook part and the circular arc part of the second hook part are separately formed.

Problems to be Solved by the Invention In the case of using the former core metal, the wire diameter d and the coil diameter D are D /
Since a spring with a large d and a taper spring could not be formed, it was not possible to form a spring with a high degree of accuracy in the hook facing angle. In addition, the latter molding requires a large number of molding tools, each of which has a unit structure, which increases the price, and the number of tools is limited by the tool mounting position on the front surface of the tool mounting plate, making it impossible to mold complicated shapes. there were.

Means for Solving Problems The first input portion 56 and the forming tool T, which rotate about the axis of the quill so that the direction of the forming surface of the forming tool T faces the direction of forming the wire rod, are in the forming standby position; A molding device 81 having a second input portion 68 that moves so as to take the molding preparation position and a swivel drive means that swivels in a plane including the quill axis and collides with the wire rod, and the molding device 8
The first servomotor 9 for inputting the turning power to the first input unit 56 of No. 1, the second servomotor 7 for inputting the moving power to the second input unit 68 of the molding apparatus, and the third for feeding the wire to be molded. It includes a servo motor 11 and an NC device which controls the first, second and third servo motors in association with each other and also controls the swing drive means in association with each other.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. Machine stand 1
A tool mounting frame 2 and a box frame 3 behind it are provided on the top,
On the tool mounting frame 2, a large gear 5 for rotating the forming tool and a large gear 4 for rotating a cam for swinging the forming tool are rotatably and concentrically supported. 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 reducer 8, and a speed reducer 10 for rotating the feed roller 14.
And a servo motor 11 for driving it.
Then, these servo motors are controlled by an NC controller (not shown).

On the front surface of the tool mounting frame 2, a quill 12 whose tip is located on the center lines of the large gears 4 and 5 and which guides the wire rod is horizontally mounted by a mounting base 13, and on the outside thereof is located below the quill center line. The feeding roller 14 and the pressing roller 15 are arranged at the upper position. The feed-out roller 14 has a V groove on its circumference and is rotatably supported by a mounting base 16 and is rotated by a speed reducer 10 from a servo motor 11. The pressing roller 15 is rotatably supported by a block 17 which is supported by a mounting base 16 so as to be vertically movable, and is pressed against the feeding roller 14 by a spring interposed between a piston rod 18a of an air cylinder 18. When the wire has a small diameter, it is pressed by the spring force. When the wire has a large diameter, the spring is killed and the wire is pressed directly. 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 body 22 is fitted on the guide base mounted near the center in the radial direction, and the tool holding body 23 is provided in the groove of the sliding body 22 in the radial direction so that the position can be adjusted in the radial direction. And the tool holder 23
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. A cam follower 25 is pivotally supported at the outer end of the sliding body 22 and 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 meshes with the large gear 4, and the cam 24 comes into contact with the cam follower 25 of the cutting device 20. And Kamufoloa 25
Springs 30 are respectively stretched between the pins 26 planted in the sliding body 22 and the two pins 29 planted on the front surface of the tool mounting frame 2 in order to bring them into contact with each other.

The molding device 81 is configured as a unit and is mounted on the tool mounting frame 2 in the radial direction. The unit stand 8
2, a gear shaft 83 is rotatably supported by a bearing portion 82a perpendicular to the mounting surface. A small gear 56 that meshes with the large gear 5 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. Further, a guide surface 82b parallel to the gear shaft 85 is formed on the upper surface of the unit base 82, and the tool operation base 88 is slidable on the guide surface 82b.
Is placed. An upper step portion 88a is formed on the quill side of the tool operation table 88, and a stepped operation cylinder 89 having the rotation direction in the sliding direction of the tool operation table 88 is formed on the upper step portion 88a.
When the unit base 82 is mounted on the tool mounting frame 2, the radial base ball bearing and the sliding bearing are rotatably supported so that the shaft center coincides with the quill shaft center, and the thrust bearing receives the reaction force applied to the tool. It is like this. A gear 90 is keyed to a small diameter portion 89a of the stepped operation cylinder 89, and a window is formed at a position of the tool operating base 88 with respect to the gear 90, and the gears 90 and 87 are provided in the window.
An intermediate gear 91 that meshes with is rotatably supported by a support shaft 92. A center hole 89b is formed in the small diameter portion 89a of the stepped operation cylinder 89.
A deep groove 89d is cut in the large-diameter portion 89c by cutting 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 via a slide bearing. The groove 89d of the stepped operation cylinder 89 is biased toward the bottom side of the groove 89d from the axial center of the operating rod 93, and the support shaft 94 is provided near the inlet to form the deep groove 8d.
A tool holder 95 that slides on 9d is pivotally supported. The tool holder 95 is exchangeably 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. And the tool holder end of the shaft opposite to the support shaft 94 with respect to the axis of the operating rod 93 and the L of the operating rod 93.
The ends are connected by a connecting plate 97. At the rear end of the tool operating console 88, a cam follower 98 is provided with a shaft 9 perpendicular to the sliding direction.
9, a bracket 88b is established between the cam follower 98 and the intermediate gear 91, and an air cylinder 100 having an axis parallel to the operating rod 93 is fixed.
A connecting piece 102 fixed to the piston rod 101 of the air cylinder 100 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 relative to each other in the axial direction. The tool holder 95 is swung by the forward movement of the operating rod 93, and the stopper 96 for positioning the forming tool T at a predetermined position on the front surface of the quill 12 is provided with a large diameter portion 89c of the stepped operation cylinder 89.
It is provided in.

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

Furthermore, the unit base 82 and the composite cam are mounted on the tool mounting frame 2.
A lever shaft 106 mounted between the cam shaft 105 and the lever 105 is pivotally supported by a lever 107 for transmitting the displacement amount of the composite cam 105 to the cam follower 98. And cam follower 98, lever 107, lever 1
A spring 109 for keeping the connection surface between the cam follower 108 of 07 and the composite cam 105 in a constant contact state is stretched between the upper step portion 88a of the tool operating base 88 and the pin on the tool mounting frame 2. The unit of the molding apparatus configured in this way is the tool mounting frame 2
As shown in FIG. 2 above, the tool is positioned radially with pins 110 positioned to face the quill.

The manufacture of the torsion coil spring as shown in FIG. 8 will be described with reference to FIG. 6 showing an operation control diagram and FIG. 7 showing each step. 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 move the cam follower 98.
The tool operation console 88 is advanced to the quill 12 side via.
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 by a required angle by a rotation command, pressurized air is sent to the rear chamber of the air cylinder 100, the piston rod 101 and the connecting piece 102 are advanced, and the operating rod 93 is advanced. 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. 7A) about the support shaft 94 and advances to the front surface of the quill 12. (FIG. 7A), 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 forming a quarter circle, the air cylinder
The pressure air of 100 is switched to the front chamber and the piston rod 101 and the connecting piece 102 are retracted to retract the operating rod 93 and the forming tool T.
Turn back 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.
To rotate the small gear 56, the gear shaft 83, the bevel gear 84,
86, gear shaft 85, gears 87, 91 to change gear 90 to 90
Rotate by °. This 90 ° rotation causes the operating rod 89 to move the operating rod 9
3 rotates 90 °, and the tool holder 95 and the forming tool T rotate 90 ° about the quill axis (Fig. 7B). 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 101, the connecting piece 102, and the operating rod 93 are advanced. 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 a 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. 7). C) After the 1/4 circle forming, the pressure air of the air cylinder 100 is switched to move the operating rod 93 backward, and the forming tool T is turned backward about the support shaft 94 to the retracted position. The composite cam 105 continues to be located on the cam working surface. The servomotor 9 is rotated and the large gear 5 is rotated to similarly rotate the small gear 56 and the bevel gear 84.
86 and gears 87 and 91 rotate the gear 90 by 90 °. As a result, the stepped operating cylinder 89, the operating rod 93, and the forming tool T are further swung 90 ° about the quill shaft (FIG. 7D). 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 action surface, and at a predetermined rotational position of the cam shaft 104, the pressure air of the air cylinder 100 is switched to the rear chamber and the operating rod 93 is advanced to rotate the forming tool 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, and the wire material is fed from the quill 12 to abut the molding surface Ta of the molding tool T to form a coil body portion (f) (FIG. 7E). 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 to retract the operating rod 93 and swivel 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 operating cylinder 89 from the large gear 5 through the gear group further 90 ° around the quill shaft, and the operating rod 93, the tool holder 95, and the forming tool T are further rotated around the quill shaft 90. Turn around (Fig. 7F). During this time, the feed roller 14 is rotated by the rotation of the servo motor 11, and the second
Make a straight line on the hook leg.

The servomotor 7 is rotated in the reverse direction, and the synthetic cam 105 is fed from the large gear 4.
Turn backwards. The composite cam 105 returns on the working surface and switches the pressure air of the air cylinder 100 to the rear chamber at a predetermined rotation position of the cam shaft 104 to move the operating rod 93 forward so that the forming tool T advances to the front surface of the quill 12 and is fed from the quill 12. Air cylinder 10 that makes a 1/4 arc by hitting the wire rod
The pressure air of 0 is switched to the front chamber and the forming tool T is swung to the retracted position (Fig. 7G). The servomotor 9 was rotated, and the stepped operation cylinder 89 was further swung 90 ° around the quill shaft from the large gear 5 and the small gear 56 through the gear group, and the forming tool T was swung 90 ° around the quill shaft. Direction (Fig. 7H). The servo motor 11 is rotated to rotate the feed roller 14 to feed the wire material from the quill 12 to directly form the hook 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 maintain 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 94 to front the quill 12. To form a 1/4 circular arc (n) by colliding with the wire rod that is sent out to the front chamber to switch the pressure air of the air cylinder 100 to the front chamber and retract the operating rod to set the forming tool T to the retracted position (No. 7 Figure I).

The servomotor 7 rotates forward to rotate the composite cam 105 to make the cam inoperative. 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 servomotor 7 continues to rotate, the composite cam 105 maintains 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. 7J). Disk cam 2
4 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 preparation position. One rotation of the small gears 56 and 68 forms one torsion coil spring. In the embodiment, the two-input forming tool in which the forming tool is rotated at a predetermined angle around the quill axis and the tool operating table is moved back and forth is shown. However, it goes without saying that the forming tool can only separately drive the advanced tools. Absent.

Effect As described in detail above, the present invention provides a servo motor for driving a large gear for tool turning of a forming apparatus capable of turning about the axis of a quill so that the forming surface of the forming tool faces the direction of forming a spring. , A servo motor for driving another large gear for advancing the forming tool toward the quill, and a servo motor for sending out the wire rod are separately provided, and a turning drive means for turning the forming tool to a position for colliding with the wire rod is provided 3 Since the two servo motors and the turning drive means are controlled by the NC device to operate at the relevant timing, D
Even a spring with a large / d and a tapered spring can be formed, which has the effect of greatly expanding the forming range such as the type and shape of the spring.

[Brief description of drawings]

FIG. 1 is a side view showing a part of the spring forming device of the present invention cut away, FIG. 2 is a front view showing the same, FIG. 3 is a sectional view showing a forming device, and FIG. 4 is a B- line in FIG. FIG. 5 is a plan view of the molding apparatus mounted and arranged on the tool mounting frame, FIG. 6 is a view showing time-sharing of the cam, wire feed, air cylinder and the like, and FIG. 7 is a spring forming process. FIGS. 8A and 8B are views of an embodiment of a torsion coil spring, where FIG. 8A is a front view and FIG.
Is a side view. 2 ・ ・ Tool mounting frame 4,5 ・ ・ Large gear 7,9,11 ・ ・ Servo motor 12 ・ ・ Quill 14 ・ ・ Feeding roller 15 ・ ・ Pressing roller 20 ・ ・ Cutting device 24 ・ ・ Cam 81 ・ ・ Molding device 100 ··· Air cylinder 105 · · Composite cam T · · Forming tool CT · · Cutting tool

Claims (1)

[Claims] 1. A molding apparatus for molding a coil spring by advancing a molding tool to the front surface of a quill that guides a wire rod fed by a feed roller, so that the molding surface of the molding tool faces the direction of forming the wire rod. A first input part for rotating the quill about the axis of the quill and a second input part for moving the forming tool so that the forming tool is in a forming standby position; and a surface including the forming tool for the forming tool. A forming device having a rotating drive means for rotating the inside to collide with the wire rod, a first servo motor for inputting a rotating power to a first input part of the forming device, and a second input part of the forming device. A second servo motor for inputting power, a third servo motor for feeding the wire to be molded, the first, second,
An NC device for controlling the third servomotors in association with each other and for controlling the swing drive means in association therewith.