JPH0644497Y2 - Torsion spring molding equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a forming device for a torsion spring, and more particularly to a forming device effective for a spring in which the bending lengths of the first and second hooks are short.

Prior art Conventionally, in this type of torsion spring molding, the arc portion of the first hook portion, the curved portion from the first hook portion to the coil portion, the body portion of the coil, the rising portion of the second hook portion, and the second hook portion. For forming the circular arc portion of the mold, etc., a plurality of forming tools radially arranged so as to be able to move back and forth or JP-B-62-43768
It is molded with a molding tool that can be swivel-positioned around the quill axis and swivel-positioned within the plane including the quill axis as shown in No.

Problems to be Solved by the Invention In the torsion spring manufactured in this manner, a straight portion having a diameter of 2 to 3 times or more of the wire diameter is required on the first hook side in order to cut the quill end on the spot after molding. Therefore, when the length is short, it is impossible to cut during the primary processing, and it is inefficient to perform the secondary processing of cutting without bending the second hook end and then moving it to another location and bending. It had a problem of high cost.

The present invention has been made in view of the above, and an object thereof is to provide a device for forming a torsion spring capable of continuously performing cutting in a primary process when the bending length of both hook portions of the torsion spring is short. Is what you are trying to do.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention forms and cuts a hook coil portion by abutting a forming tool on a wire sent out through a quill by the drive of an associated controlled drive device. In a spring forming device that separates with a tool, a first driving unit that rotates about the axis of the quill so that the direction of the forming surface of the forming tool faces the direction in which the wire is formed, and the forming tool is in a forming standby position, forming A forming device having a second drive means for moving the preparation tool and a turning drive means for turning the forming tool in a plane including the axis of the quill and colliding with the wire rod. A cutting blade that can be optionally attached around the wire rod so that it can advance to a position where it comes into contact with the side surface of the wire rod that has been fed away from the front face of the quill, and facing the cutting blade. It includes a cutting blade that can be optionally attached around the wire so that it can advance to the front side of the quill away from the tip surface of the quill to shear the wire, and the cutting direction is selected according to preforming. is there.

Action In the formation of the torsion spring shown in FIG. 8, the quill is formed with the bending of the first hook of the next spring, and the coil portion following the straight portion of the leg portion is formed by the forming tool that advances from the predetermined angle position. , The forming tool is swivel-positioned around the quill axis at a predetermined angle, and the forming tool advances to the front side of the quill to form the first bend of the second hook after the linear leg of the second hook, and then feeds out the linear portion. Rotate the tool at a predetermined angle to advance to the front of the quill, form the second bend of the second hook, send out the second hook, the first hook of the next spring, and the straight line part, and advance the forming tool to the front of the quill. After forming the bend of the first hook of the next spring, the cutting blade is advanced to contact the wire and the cutting blade is advanced to shear the wire and separate the spring.

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 the cam for swinging the forming tool and advancing the cutting 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. And these servo motors are not shown NC
It is controlled by the controller.

On the front surface of the tool mounting frame 2, a quill 12 which has a tip located on the center line of the large gears 4 and 5 and which guides the wire is horizontally mounted by a mounting base 13, and outside thereof is located below the quill center line. Sending roller 14, pressing roller 15 at upper position
Are arranged. 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 piston rods 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 clamped by the upper and lower rollers and sent out from the quill 12. In addition, the cutting blade device 20 is a large gear to cut the wire sent from the quill 12 at the required position.
It is mounted radially towards the center of 4,5.
This mounting position is aligned with the cutting direction of the torsion coil spring to be molded. 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 radial groove of the sliding body 22 so that the position can be adjusted in the radial direction. Then, quill the inner end of the tool holder 23.
12 A cutting blade tool CT1 is provided to be replaceable apart from the front surface. 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 this cam 24 is the cutting and cutting blade device 20.
It is designed to come into contact with the camphor follower 25. Then, a pin 26 that is planted in the sliding body 22 for contacting the cam follower 25 and two pins 29 that are planted in the front surface of the tool mounting frame 2
Springs 30 are respectively stretched between and. Quill again
A cutting receiving blade device 40 is mounted on the opposite side of 12 from the cutting cutting blade device 20 in the radial direction toward the center of the large gears 4 and 5. That is, a sliding body 41 is fitted to a guide table mounted near the center in the radial direction, and a tool holding body 42 is provided in a radial groove of the sliding body 41 so that the position of the tool holding body 42 can be adjusted in the radial direction. A cutting edge CT2 is provided on the inner end of the tool holder 42 such that the blade surface is displaced so as to shear the wire with the cutting edge CT1, and the cutting edge CT2 is replaceable apart from the front surface of the quill 12.
At the outer end of the sliding body 41, a cam follower 44 is pivotally supported and two spring tension pins 45 are planted. A cam 43 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 43 comes into contact with the cam follower 44 of the cutting blade device 40. A spring 47 is stretched between a pin 45 implanted in the sliding body 41 for contacting the cam follower 44 and two pins 46 implanted in the front surface of the tool mounting frame 2. The forward end of the cutting blade that is advanced by the cam 43 is positioned so as to contact the side surface of the wire rod fed from the quill.

The forming device 81 is configured 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. At the protruding end of the gear shaft 83, the large gear 5
A small gear 56 meshing with is keyed, and a bevel gear 84 is keyed to the other end. A gear shaft 85 is rotatably supported by bearings 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 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 having the slide direction of the tool operation console 88 as a rotation axis is provided on the upper step portion 88a and the unit base 82 is attached to the tool mounting frame 2. 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. The 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 tube 89, the groove 8d is formed from the axis of the operation rod 93.
A tool holder 95, which is biased toward the bottom side of 9d and slides into a deep groove 89d by a support shaft 94 near the entrance, is swingably supported. This tool holder 95 has an operating rod 93 that passes through a spindle 94 so that a forming tool T having a forming surface Ta on the axis of the operating rod 93 can face the quill 12.
Is attached to a line parallel to the axis of the operating rod 93, and the end of the tool holder on the side opposite to the support shaft 94 with respect to the axial center of the operating rod 93 and the L end of the operating rod 93 are connected by a connecting plate 97. ing.
A cam follower 98 is pivotally supported at the rear end of the tool operating table 88 by a shaft 99 perpendicular to the sliding direction. The cam follower 98 and the intermediate gear 91
A bracket 88b is established between the operating rod 93 and the control rod 93, and an air thin lider 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. Then, when the operating rod 93 moves forward, the tool holder 95
A stopper 96 for rotating the molding tool T at a predetermined position on the front surface of the quill 12 is provided on the large diameter portion 89c of the stepped operation cylinder 89.

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

Furthermore, on the tool mounting frame 2, the unit base 82 and the composite cam 10
A lever shaft 106 mounted between the lever 5 and 5 is pivotally supported by a lever 107 for transmitting the displacement amount of the composite cam 105 to the cam follower 98. Then, a spring 109 for keeping the connecting surface of the cam follower 98 and the lever 107, and the connecting surface of the cam follower 108 of the lever 107 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. ing. The unit of the molding apparatus configured as described above is arranged on the tool mounting frame 2 by being positioned by the pin 110 on the radius so that the tool faces the quill as shown in FIG.

The manufacture of the torsion coil spring as shown in FIG. 8 will be described with reference to FIG. 6 showing a control diagram and FIG. 7 showing each step. First, it is assumed that the production of the torsion spring is suspended, and the tip bent portion (b) of the first hook is produced. 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 unit, and the composite cam 1 of the cam shaft 104 is rotated.
05 is rotated. The cam surface of the composite cam 105 rotates the lever 107 to quill the tool operating console 88 via the cam follower 98.
Move forward to side 12. 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. 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 degrees. As a result, the stepped operating cylinder 89, the operating rod 93, and the forming tool T are turned 90 ° about the quill shaft (FIG. 7A). Further, the delivery roller 14 is rotated by the servo motor 11 to deliver the wire material to form the straight portion (c) of the leg of the first hook.

The servomotor 7 is rotated forward and the small gear 68 is rotated by the large gear 4,
The composite cam 105 is rotated. The composite cam 105 returns to the normal direction as it is on the cam working surface, and the compressed air of the air cylinder 100 is switched to the rear chamber at the predetermined rotation position of the cam shaft 104 to move the operating rod 93 forward 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 against the forming surface Ta of the forming tool T to form the coil body portion (d) (FIG. 7B). 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 servo motor 9 is rotated to rotate the stepped operation cylinder 89 from the large gear 5 through the gear group by 90 ° around the quill shaft, and the operation rod 93, the tool holder 95, and the forming tool T are further rotated around the quill shaft by 90 °. Rotate (Fig. 7C). During this time the servo motor
The rotation of 11 rotates the feeding roller 14 to form the straight part (e) 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 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 to move the forming tool T to the quill 12.
To the front surface of the quill 12 to collide with the wire fed from the quill 12 to form a 1/4 circular arc (f), the pressure air of the air cylinder 100 is switched to the front chamber, and the forming tool T is swung to the retracted position (Fig. 7). D). Rotate the servo motor 9 to rotate the large gear 5,
From the small gear 56, the stepped operation cylinder 89 is further swung by 90 ° around the quill shaft through the gear group, and the forming tool T is swung by 90 ° around the quill shaft (FIG. 7E). The quill 12 is rotated by rotating the servo motor 11 and the feed roller 14.
Send out the wire and make a straight line (g) at the hooking part 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 keeps 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 support the forming tool T as a spindle.
It swivels around 94 and advances to the front of the quill 12 and collides with the wire that is sent out to form a 1/4 circular arc (ch) to switch the pressure air of the air cylinder 100 to the front chamber and retract the operating rod to form it. The tool T is set to the retracted position (Fig. 7F). Direction in which the servomotor 9 is rotated and the stepped operation cylinder 89 is further swung 90 ° around the quill shaft from the large gear 5 and the small gear 56 via the gear group, and the forming tool T is swung 90 ° around the quill shaft. (FIG. 7C). The servo motor 11 is rotated to rotate the feed roller 14 to feed the wire material from the quill 12 to form a straight line (a).

The servomotor 7 is rotated in the reverse direction to drive the composite cam 10 from the large gear 4.
Turn 5 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 rotation position of the cam shaft 104 to advance the operating rod 93 to advance the forming tool T to the front surface of the quill 12 and to send it out from the quill 12. A 1/4 circular arc (B) is made to collide with the wire rod to be formed (FIG. 7H), the pressure air of the air cylinder 100 is switched to the front chamber, and the forming tool T is swung to the retracted position.

The servomotor 7 is rotated in the forward direction to rotate the composite cam 105 and bring the cam to the inoperative position. Further, the cam follower 44 is pushed toward the center by the disc cam 43 attached to the small gear (not shown) that meshes with the large gear 4, and the cutting blade CT2 advances to a position apart from the front face of the quill 12 by the forward movement of the sliding body 41. At the forward end, the blade line of the receiving blade comes into contact with the side surface of the wire at the center of (a) in FIG. On the other hand, a disc cam 24 attached to a small gear (not shown) that meshes with the large gear 4 pushes the cam follower 25 toward the center, slightly behind the cam follower 44, and the cutting blade CT1 is cut in front of the sliding body 22.
Moves forward to a distant position on the front surface of the quill (Fig. 7I) and shears the wire at the center of Fig. 8 (A) with the cutting blade CT2. The formed torsion spring is stored in the tray, and the quill 12 is in a state where the bent portion of the first hook of the next torsion spring is formed.

Effects Since the present invention is configured as described above, it has the following effects. When the bending length of both ends of the torsion spring is short, secondary cutting was required, but it can be performed continuously during primary processing, which has the effect of reducing the processing steps, time, and special accessories. Also the first
The hook side bending step can be performed first. In addition, it is possible to select the cutting direction that suits the desired preforming, and it is possible to cut other than the quill front end face.
It can be cut according to various shapes of the second hook, which is very effective for manufacturing various torsion springs.

[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. 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 ... Feed roller 15 ... Press roller 20 ... Cutting blade device, 24, 43 ... … Cam 40 …… Cutting blade device, 81 …… Molding device 100 …… Air cylinder, 105 …… Composite cam T …… Molding tool, CT1 …… Cut blade CT2 …… Cut blade

Claims (1)

[Scope of utility model registration request] 1. A spring forming device for forming a hook coil part by causing a forming tool to collide with a wire sent out through a quill by driving of a related controlled drive device and separating the wire with a cutting tool. A first drive means for rotating the quill about the axis of the quill so that the direction is opposite to the direction for forming the wire rod, and the second moving means for moving the forming tool to a forming standby position and a forming preparation position.
A forming device having a drive means and a rotation drive means for rotating the forming tool in a plane including the axis of the quill to collide with the wire, and to a side surface of the wire sent out from the front surface of the quill away from the tip surface of the quill. A cutting blade that can be arbitrarily attached around the wire rod so that it can advance to the position where it abuts, and the wire rod that can advance to the front side of the quill that is distant from the tip end surface of the quill to shear the wire rod facing the cutting blade. A device for forming a torsion spring, which comprises a cutting blade that can be arbitrarily attached around the cutting edge, and selects a cutting direction in conformity with preforming.