JPH04734B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a spring forming apparatus for forming a coil portion, an arc of a hook, or a bent portion by abutting a wire rod against a forming tool.

Prior Art A conventional spring forming device that forms a coil spring by advancing a forming tool and a cutting tool onto the front surface of a quill that guides a wire fed by a feed roller is known, for example, from Japanese Patent Publication No. 12379/1983. The large gear that directly drives the forming tools and cutting tools is composed of one piece, and the action timing of the plurality of forming tools and cutting tools is integrated into one rotation of the large gear.

Problems to be Solved by the Invention The driving cam of the forming tool requires an upward slope and a downward slope between the active area and the non-active area, and the required angle for driving the cam is automatically determined by the forming spring. ,
As the number of forming tools increases, and depending on the type of spring, each angle may be changed to one revolution of one drive gear.
It becomes impossible to distribute within 360° and timing becomes difficult. For this reason, the number of tools used and the angle required for forming are limited, and the movement pattern of the forming slide holding the forming tool is restricted, and the pattern cannot be changed arbitrarily. In addition, it is difficult to adjust the timing of cams that require synchronized operation in forming tools and cutting tools, and this is done by aligning the cams, which is a troublesome and inefficient work.

Means for Solving the Problems In a spring forming device in which tools are arranged radially so as to move forward and backward toward a wire rod fed out from a quill, a small gear for rotating a drive cam of the tool is meshed with either one at an arbitrary position on the outer periphery. two large drive gears are provided in parallel so as to be rotatable about the center of the tip of the quill, two drive motors are provided that separately rotate the large drive gears, and the drive motors are controlled in conjunction with each other. It is equipped with an NC device that allows the tools to be operated separately at the same timing.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. A tool mounting frame 2 and a box frame 3 behind it are provided on the machine base 1, and the tool mounting frame 2 includes a large gear 5 for rotating the forming tool, a cam for rotating the forming tool, and a cam for moving the cutting tool forward and backward. Large gears 4 for rotating the cam are rotatably supported in parallel and concentrically. The box frame 3 includes a reducer 6 that rotates the large gear 4, a servo motor 7 that drives it, a reducer 8 that rotates the large gear 5, and a servo motor 9 that drives it.
and a reducer 10 that rotates the delivery roller 14
It has a built-in servo motor 11 that drives it. And these servo motors are not shown.
Controlled by NC controller.

A quill 12 whose tips are located on the center line of the large gears 4 and 5 and which guides the wire rod is mounted horizontally on the front side of the tool mounting frame 2 by a mounting base 13. A feed roller 14 is placed at the position, and a press roller 15 is placed at the upper position. The delivery roller 14 has a V-groove on its circumference, is rotatably supported by a mounting base 16, and is rotated by a reduction gear 10 from a servo motor 11. The presser roller 15 is rotatably supported by a block 17 that is vertically movably supported on a mounting base 16, and is pressed against the feed roller 14 by a spring interposed between piston rods 18a of an air cylinder 18. When the diameter of the wire is small, it is pressed by the spring force, and when the wire is large, the spring is killed and the wire is pressed directly. The wire wound around the hoop is then held between upper and lower rollers and sent out from the quill 12.
In addition, in order to cut the wire fed from the quill 12 at a desired position, a cutting blade device 20 is connected to a large gear 4,
5 is attached radially towards the center. That is, a sliding body 22 is fitted into a guide stand mounted near the center in the radial direction, and a tool holder 23 is provided in a radial groove of this sliding body 22 so that its position in the radial direction can be adjusted. and tool holder 23
A cutting tool CT whose cutting surface matches the surface of the quill 12 is replaceably provided at the inner end of the quill 12. A cam follower 25 is pivotally supported at the outer end of the sliding body 22, and two spring tension pins 26 are implanted therein. A disc cam 24 for advancing and retracting the cutting tool 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 this cam 24 is configured to come into contact with the cam follower 25 of the cutting blade device 20. It's summery.
A spring 30 is stretched between a pin 26 implanted in the sliding body 22 and two pins 29 implanted in the front surface of the tool mounting frame 2 in order to bring the cam follower 25 into contact with each other.

The forming device 81 is constructed as a unit and is mounted on the tool mounting frame 2 in the radial direction. 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 is keyed to the protruding end of the gear shaft 83, and a bevel gear 84 is attached to the other end.
The keys are worn. A gear shaft 85 is mounted on the unit base 82 in parallel with the mounting surface and perpendicular to the gear shaft 83.
is rotatably supported by a bearing, and a bevel gear 86 that meshes with the bevel gear 84 is keyed to the end of the gear shaft 85, and a wide gear 87 is also keyed to the end of the gear shaft 85. Furthermore, a gear shaft 85 is provided on the upper surface of the unit stand 82.
A guide surface 82b is formed parallel to the guide surface 82b, and a tool operating table 88 is slidably mounted on the guide surface 82b. There is an upper section 88 on the quill side of the tool operating table 88.
A is formed in the upper part 88a, and a stepped operation tube 89 whose rotation axis is the sliding direction of the tool operation table 88 is aligned with the quill axis when the unit table 82 is attached to the tool mounting frame 2. It is rotatably supported around the axis by a radial ball bearing and a sliding bearing, and receives the reaction force applied to the tool by a thrust bearing. A gear 90 is keyed to the small diameter portion 89a of the stepped operating barrel 89, and a window is bored at the position of the tool operating table 88 relative to the gear 90.
An intermediate gear 91 meshing with gear 87 is rotatably supported on a support shaft 92. Small diameter portion 89 of stepped operation tube 89
A center hole 89b is bored in the large diameter portion 89c, and a deep groove 89d is cut out in the diametrical direction with a width equal to the diameter of the center hole 89b, leaving only one surface. An operating rod 93 is attached to the small diameter hole 89b via a sliding bearing.
is rotatably and axially movably supported. In the groove 89d of the stepped operation tube 89, a tool holder 95 is swingably supported near the inlet so as to be offset from the axis of the operation rod 93 toward the bottom side of the groove 89d, and slides into the deep groove 89d with a support shaft 94. ing. This tool holder 95 is replaceably mounted on a line parallel to the axis of the operating rod 93 passing 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. At the same time, the tool holder end 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. Tool operation table 8
A cam follower 89 is pivotally supported at the rear end of the cam follower 89 by a shaft 99 perpendicular to the sliding direction, and a bracket 88b is established between the cam follower 98 and the intermediate gear 91. A cylinder 100 is fixed. The connecting piece 102 fixed to the piston rod 101 of the air cylinder 100 connects the rear end of the operating rod 93 to the needle bearing.
They are connected integrally and relatively rotatably in the axial direction by a thrust bearing. A stopper 96 is provided on the large-diameter portion 89c of the stepped operating barrel 89 for rotating the tool holder 95 as the operating rod 93 moves forward and positioning the forming tool T at a predetermined position in front of the quill 12.

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

Furthermore, the lever shaft 1 is mounted on the tool mounting frame 2 between the unit stand 82 and the composite cam 105.
06 is the displacement amount of the composite cam 105 as the cam follower 9
8 is pivotally supported. And cam follower 98, lever 107, lever 10
A spring 109 that keeps the connection surfaces of the cam follower 108 of No. 7 and the composite cam 105 in contact at all times is stretched between the upper part 88a of the tool operating table 88 and the pin on the tool mounting frame 2. The unit of the forming apparatus constructed in this way has a pin 1 placed on the tool mounting frame 2 on the radius so that the tool faces the quill as shown in Figure 2.
10 and is positioned and placed.

Manufacturing of the torsion coil spring as shown in FIG. 8 will be explained with reference to FIG. 6 showing a control diagram and FIG. 7 showing each process. The feed roller 14 is rotated by the servo motor 11 in response to a command from an NC device (not shown), and the hook end straight portion (a) of the spring is fed out.
Next, the small gear 68 is rotated by the large gear 4 rotated by the servo motor 7 according to a command from the NC device, and the composite cam 105 of the camshaft 104 is rotated. The cam surface of the composite cam 105 rotates the lever 107 to advance the tool operating table 88 toward the quill 12 via the cam follower 98. By this advancement, the operating cylinder 89 is advanced together with the forming tool T from the forming preparation position to the forming standby position. When the camshaft 104 rotates by a required angle according to the rotation command, pressurized air is sent to the rear chamber of the air cylinder 100, and the piston rod 101 and the connecting piece 10
2 is advanced to advance the operating rod 93. Therefore, the connecting plate 97 rotates the tool holder 95 around the support shaft 94, and the forming tool T in the retracted position (imaginary line in FIG. (Fig. 7A) and molding surface
Ta collides with the wire to be sent out to form the bent part (b) of the first hook, and after forming a 1/4 circle, air cylinder 1
00 pressure air is switched to the front chamber, 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 and returned to the retracted position. At this time, the cam action surface of the composite cam 105 is in the action position because it has a wide width.

Next, the large gear 5 is rotated by the servo motor 9 according to a command from the NC device, and the small gear 56 and the gear shaft 8 are rotated.
3. Bevel gears 84, 86, gear shaft 85, gear 87,
91 rotates the gear 90 by 90 degrees. With this 90° rotation, the operating rod 93 is rotated 90° by the operating cylinder 89, and the tool holder 95 and forming tool T are rotated 90° about the quill shaft (FIG. 7B). Further, the feed roller 14 is rotated by the servo motor 11 to feed out the wire to form a straight portion (c) of the engaging portion of the first hook.

The servo motor 7 is reversed, the large gear 4 is reversed, the composite cam 105 returns on the cam action surface, and the lever 107 continues to contact the cam follower 98.
The tool operating table 88 is kept at the advanced molding standby position, and at a predetermined rotational position of the camshaft 104, the pressure air of the air cylinder 100 is switched again to the rear chamber, and the piston rod 101, the connecting piece 102, and the operating rod 93 are moved forward. Therefore, the tool holder 95 and the forming tool T are rotated and advance to the front of the quill 12 from a direction deviated by 90 degrees from the previous direction, colliding with the wire being fed out and forming a bent part (d) (Fig. 7). C) After forming the 1/4 circle, the pressurized air in the air cylinder 100 is switched, the operating rod 93 is moved back, and the forming tool T is rotated in the opposite direction about the support shaft 94 to the retracted position. Synthetic cam 10
5 continues to be located on the cam action surface. The servo motor 9 is rotated, the large gear 5 is rotated, and the small gear 56, the bevel gears 84, 86, and the gears 87, 91 rotate the gear 90 further by 90 degrees. As a result, the stepped operation tube 89, the operation rod 93, and the forming tool T are further rotated by 90 degrees around the quill shaft (FIG. 7D). Also, the servo motor 11 drives the feed roller 1.
4 and feed out the wire to create the straight part (E) of the leg of the first hook.

The servo motor 7 rotates forward, and the large gear 4 rotates the small gear 68 and the composite cam 105. The composite cam 105 returns in the forward rotation direction on the cam action surface, and at a predetermined rotational position of the camshaft 104, the pressurized air of the air cylinder 100 is switched to the rear chamber to advance the operating rod 93 and rotate the forming tool T by 90 degrees. It is rotated from the position to the front of the quill 12 around the support shaft 94. Rotate the servo motor 11 to feed the roller 1
4, the wire is fed out from the quill 12, and brought into contact with the forming surface Ta of the forming tool T to form the coil body part (F) (FIG. 7E). If the coil body portion is long, the rotation of the servo motor 7 is stopped as necessary to maintain the composite cam 105 at the operating surface position. When the required number of coil turns is formed, the pressurized air in the air cylinder 100 is switched to the front chamber, the operating rod 93 is moved back, and the tool holder 95 and forming tool T are rotated to the retracted position. Synthetic cam 105
continues to be located on the cam action surface.

The servo motor 9 is rotated, and the stepped operation tube 89 is further rotated 90 degrees around the quill shaft via the gear group from the large gear 5, and the operation rod 93, tool holder 95, and forming tool T are further rotated 90 degrees around the quill shaft. Rotate (Figure 7F). During this time, the feed roller 14 is rotated by the rotation of the servo motor 11, thereby creating a straight part (G) of the leg of the second hook.

The servo motor 7 is rotated in the reverse direction to cause the large gear 4 to rotate the composite cam 105 in the reverse direction. The composite cam 105 returns to the working surface and at a predetermined rotational position of the cam shaft 104 switches the pressurized air of the air cylinder 100 to the rear chamber and moves the operating rod 93 forward to advance the forming tool T to the front of the quill 12 and is sent out from the quill 12. A 1/4 arc is created by abutting against the wire, the pressurized air of the air cylinder 100 is switched to the front chamber, and the forming tool T is rotated to the retracted position (FIG. 7G). The servo motor 9 was rotated, and the stepped operation tube 89 was further rotated 90 degrees around the quill shaft via the gear group from the large gear 5 and the small gear 56, and the forming tool T was rotated 90 degrees around the quill shaft. direction (Figure 7H). The servo motor 11 is rotated to rotate the feed roller 14 to feed the wire from the quill 12 to form a straight line at the hooking portion of the second hook.

The servo motor 7 is rotated forward to rotate the composite cam 105 by the large gear 4. The composite cam 105 continues to maintain its cam action surface, and when the cam shaft 104 rotates at a predetermined rate, the pressurized air of the air cylinder 100 is switched to the rear chamber, and the operating rod 93 is moved forward to move the forming tool T to the support shaft 94.
The quill 12 rotates around the center, advances to the front of the quill 12, collides with the wire to be sent out, forms a 1/4 arc (nu), switches the pressurized air of the air cylinder 100 to the front chamber, and retreats the operating rod to form the forming tool. Set T to the retracted position (Fig. 7 I).

The servo motor 7 rotates forward to rotate the composite cam 105 and make the cam inactive. The feed roller 14 feeds out the wire by the rotation of the servo motor 11.
Create a straight line at the end of the hook. Even when the servo motor 7 continues to rotate, the composite cam 105 maintains the cam non-action position.

On the other hand, a disc cam 24 attached to a small gear (not shown) meshing with the large gear 4 causes the cam follower
5 is pushed toward the center and the sliding body 22 moves forward to cut the cutting tool.
The CT advances to the front of the quill 12 and cuts the wire (FIG. 7J). The disc cam 24 rotates to the cam non-action position and returns to its initial position, and the composite cam 105 also returns to its initial position. The forming tool T is also moved back and returned to the forming preparation position. 1 rotation of small gears 56 and 68
torsion coil springs are formed. In addition,
In the embodiment, the forming tool rotates at a predetermined angle around the quill axis, and the forming tool has two inputs for moving the tool operating table forward and backward, but it goes without saying that the forming tool can separately drive a tool that only moves forward.

Effects As detailed above, the present invention provides two large gears for driving a forming tool and a cutting tool in parallel, and a drive motor that rotates each large gear independently, and connects each drive motor with an NC device. This allows for controlled rotation of multiple forming tools, cutting tools, or a single forming tool capable of inputting two systems, by driving them from different drive gears to perform separate operations at the same timing. It becomes possible to do so. In other words, the timing of the cam's action can be distributed within an action angle twice as large as 360°, and a large number of forming tools can be attached. This makes it easy to design the movement pattern of the molded slide, and the range of spring molding can be greatly expanded. Another advantage is that the timing of the camshafts, which require synchronous operation, can be easily adjusted using the NC program.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of the spring forming device of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a cross-sectional view of the forming device, and FIG. 4 is B--B in FIG. B
5 is an explanatory plan view of the forming device mounted on the tool mounting frame, FIG. 6 is a diagram showing time shearing of cams, line feeds, air cylinders, etc., and FIG.
The figure shows a spring forming process, and FIG. 8 shows an embodiment of a torsion coil spring, in which a is a front view and b is a side view. 2... Tool mounting frame, 4, 5... Large gear, 7,
9, 11... Servo motor, 12... Quill, 1
4...Feeding roller, 15...Press roller,
20... Cutting blade device, 24... Cam, 81...
Molding device, 100... Air cylinder, 105...
Synthetic cam, T...forming tool, CT...cutting tool.

Claims (1)

[Claims] 1. In a spring forming device in which tools that can move forward and backward toward a wire rod fed out from a quill are arranged radially, a small gear for rotating a drive cam of the tool is engaged with one of two large drive gears at an arbitrary position on the outer periphery. are arranged in parallel so as to be rotatable about the center of the tip of the quill, two drive motors are provided to separately rotate the large drive gears, and an NC device is provided to control the drive motors in conjunction with each other. A spring forming device characterized by being able to operate separately at the same timing.