JP3367916B2 - Spring forming machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a machine for molding a coil spring.

[0002]

2. Description of the Related Art A spring manufactured by a conventional spring molding machine has hook-like protrusions a'at both ends thereof like the spring a shown in FIG. Since both ends a'are useless, they need to be cut off, resulting in extra cutting work after spring molding and waste of material, resulting in poor wire usage rate, which is not economically efficient. Further, the conventional spring molding machine includes a large number of rollers and other parts, and the molded spring has not only the tolerance of its length but also the tolerance of its inner diameter and outer diameter. In addition, there are many chances of rubbing the wire rod during the molding process, which causes defects such as damage to the wire rod and residual stress.

In addition, since the conventional spring molding machine has a large number of motors, a large amount of noise is generated when driving and working. In general, since an AC motor is used, it is idle during standby, so electricity is generated. waste. However, the one using the servo motor does not have the phenomenon of idling.
In addition, since there are many rollers and other parts, the overall weight is not too light. For example, a molding machine for making a spring with a diameter of 16 mm weighs up to 15 tons, and the material cost is high, and installation and its transportation are not easy. .

[0004]

Therefore, according to the present invention, the size of the spring can be accurately molded, there is no wasteful cut-off portion, the wire is not damaged, the residual stress is low, and the operation is simple and convenient. It is an object of the present invention to provide a fully automatic spring forming machine that is low in cost, low in energy consumption and fully automatic.

[0005]

According to the spring molding machine of the present invention, a machine base having a first rail and a second rail, and a second rail of the machine base are installed so as to be capable of reciprocating,
A material feeder that can supply the wire material that is the material of the spring, a rotatable winding shaft that is installed at the top of the machine base and winds the wire material to form a semi-finished product spring, and a wire material that is installed above the winding shaft to sandwich the wire material A winding machine having an automatic clipper rotatable with the winding shaft, and a motor for driving the winding shaft, and a material feeding machine movably provided on the first rail of the machine stand so as to face the winding machine. And a cutting machine for cutting the semi-finished product spring supplied by the company.

The material feeder sends a wire rod of a predetermined length to the automatic clipper of the winder, and the pinching head of the automatic clipper puts the end of the wire rod of the material feeder on the winding shaft under the control of the computer. Put it in, start the servo motor of the winder, rotate the winding shaft and wind the wire on it, and at the same time, the material feeder moves gradually further away from the clipper and at a certain position. Stop. At this time, a semi-finished spring with a correct size is formed on the winding shaft. When the semi-finished product spring is molded,
The automatic clipper rotates in the opposite direction a suitable number of times to shape the semi-finished spring after it is molded and eliminate the residual stress. The material feeder then moves along with the semi-finished spring and the wire towards the cutter, separating the semi-finished spring from the wire. In this way, in addition to the process of molding the spring of the present invention, the above-mentioned winding shaft can be replaced depending on the length, inner diameter, and outer diameter of the spring to be manufactured, so that the production flow work can be promptly changed. To do.

The winding shaft stops after forming the wire rod continuously supplied from the material feeder into a spring having a predetermined length. The material feeder then sends the spring to the cutter, which separates the semi-finished spring from the wire. This completes the first molding operation of the spring. After that, the winding shaft rotates again, the second spring molding is started, and the same operation as described above is repeated to continuously mold the spring.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The spring molding machine of the present invention is shown in FIG.
As shown in FIGS. 2 and 2, the machine base 1 on which various members are mounted, the material feeder 2 that continuously supplies the molded wire rod 5 (that is, the wire material of the spring), and the wire rod 5 are provided. A winding machine 3 for sandwiching and winding, and a cutting machine 4 facing the winding machine 3 and separating a semi-finished product spring.
And a wire rod support 6 for stably and timely supplying the wire rod 5.

The spring forming machine of the present invention is designed to be flexibly adaptable to various manufacturing conditions and to be automated. The spring forming machine is installed on the vertical side surface and the upper surface of the machine base 1, and the material supplying machine 2 is used.
There are two second rails 12 and first rails 11 on which the cutting machine 4 slides and moves.

A wire rod 5 that slides on the second rail 12.
The material feeder 2 that continuously supplies the wire rod has a wire feed head 21 for securing the flatness of the wire rod 5 while positioning and feeding the wire rod at its front end. When the material feeder 2 supplies the material, the wire rod 5 having an appropriate length (about 10 to 15 cm) is mounted on the supply head 21 so that winding and molding of the wire rod 5 are convenient. At the same time, the material feeder 2 continuously feeds the wire 5 during the spring forming process.

A winding machine 3 for sandwiching and winding the wire 5 is installed above the upper surface of the machine base 1, and has a motor 31, a winding shaft 32 rotated by the motor 31, and a winding shaft 32. It is composed of an automatic clip 33 which is attached and rotates at the same time. The take-up shaft 32 can be replaced with one having a different length and outer diameter depending on the size of the spring to be molded.

Next, as shown in FIGS. 2 and 5, when the material feeder 2 sends the wire 5 to the upper surface of the winding shaft 32 of the winding machine 3, the pinching head 331 of the automatic pinching tool 33. Place the end of the wire rod 5 of about 5 to 7 mm on the winding shaft 32, start the motor 31 to rotate the winding shaft 32, wind the wire rod 5 on the winding shaft 32, and gradually Mold the spring. The winding shaft 32 winds the wire 5 at the same time, and the material feeder 2 continuously and stably moves in a direction away from the automatic clipper 33 to move the wire 5 onto the winding shaft 32. Wrap them in order to form a semi-finished spring. When the wire rod 5 of the present invention is formed by winding the wire rod 5 into a winding semi-finished product spring, the winding direction and the direction in which the wire rod 5 is sandwiched are the same (that is, the same axial direction). If the spring reaches a predetermined length on the winding shaft 32 without forming hook-shaped protrusions on both ends,
The winding shaft 32 stops immediately. If a servo motor is used, the motor 31 can be stopped immediately after the spring is molded, and if it is restarted when the next spring is molded, the motor 31 will continuously rotate idle like a conventional spring molding machine using an AC motor. No need.

Further, as shown in FIG. 5, in order to prevent the winding shaft 32 from being too long and having a large torque, the winding shaft 32 may hang down and the formed spring may be deformed. At the end of the winding shaft 32 on the upper surface of the table 1, a central supporting table 13 having a supporting action is attached. Therefore, as shown by the dotted line in FIG. 5, the center support 13 has an adjustable two-stage hydraulic structure, and the spring has the winding shaft 3
2. When molded on 2, the center support 13 is hydraulically pressed to support the winding shaft 32 from the bottom to the top, and when the spring is molded, the center support 13 is lowered to wind the spring. It is taken out from the shaft 32.

Similarly, FIG. 6 shows another embodiment in which the end of the winding shaft 32 is supported, and a central screw hole 321 is provided in the center of the end surface of the winding shaft 32 near the upper surface of the machine base 1 and is screwed. Screw on the tube 14. A bearing 15 is attached to the outer circumference of the threaded pipe 14, and a movable V-shaped base 16 that supports the bearing 15 and positions the center thereof is provided below the bearing 15. As shown by the dotted line in FIG. 6, the V-shaped base 16 can be automatically moved up and down by a two-stage hydraulic structure, and the spring can wind the winding shaft 3.
When the V-shaped base 16 is rolled and molded on the upper side of the upper surface 2, the V-shaped base 16 pushes the bearing 15 upward by hydraulically operating the winding shaft 32.
After the spring is molded, the V-shaped base 16 can be lowered to take out the spring from the winding shaft 32.

The cutting machine 4, which is installed on the first rail 11 installed on the vertical side surface of the machine base 1 and cuts the semi-finished product spring in opposition to the winding machine 3, is a spring above the winding machine 3. After the completion of the molding and the molding, the material feeder 2
Disconnects it from the wire 5 when it sends the semi-finished spring along the second rail 12. Since the cutting machine 4 is installed so as to slide on the first rail 11,
If the length of the take-up shaft 32 is different, the position of the cutting machine is flexibly adjusted to accommodate the production of springs having different lengths. Further, as shown in FIG. 2, the cutting machine 4 is composed of a hydraulic propulsion device 41 and a cutter 42 installed thereon. If the cutter 42 becomes dull due to use, it can be removed, polished, and reused, thereby saving equipment costs.

Next, as shown in FIGS. 3 and 4, the present invention provides stable and timely supply of the wire 5 required for molding.
A wire rod support 6 for supplying the wire rod 5 at a proper time is provided near the material feeder 2 on the vertical side surface of the machine base 1. This wire rod support 6
Is a support shaft 61, a wire board 62 which is assembled on the support shaft 61 and around which the wire 5 is wound, a belt 64 which is wound around a rod which is a lower part of the support shaft 61, and the belt 64.
And a motor 63 for rotating the. Of course, it is desirable to use a servo motor as the motor 63.

The wire 5 wound on the wire support 6 is drawn into the material feeder 2 and comes out of the supply head 21 to be supplied as required for spring molding. When the winding shaft 32 starts to wind the wire 5, a computer (not shown) sends a signal to the motor 63, which causes the motor 6 to rotate.
3 starts and rotates the wire board 62, and the necessary wire 5
Send out. When the take-up shaft 32 takes up the wire 5 having a predetermined length, the computer immediately issues a command to stop the take-up shaft 32 and the motor 63 at the same time, and the material supply machine 2 causes the semi-finished product spring to the cutting machine 4. Only after it has been sent and cut is completed, the take-up shaft begins to form the next spring. Then, the computer again starts the motor 63 to rotate the wire board 62 and repeats the above-described operation. In this way, the wire rod support 6 achieves the purpose of timely and stably supplying the wire rod to the extent required for spring molding.

If the wire rod 5 on the wire rod 62 is about to disappear, the wire rod 62 is removed from the supporting shaft 61, and the wire rod 62 around which the new wire rod 5 is wound is supported by the shaft 6.
The wire rod 5 is inserted into the material feeder 2 after being assembled to the wire rod 1. Even if the wire rod 5 is used up in this way, it does not take much time to replenish the new wire rod 5, and the manufacturing work is not so affected.

As shown in FIG. 7, the spring forming operation of the spring forming machine of the present invention is as follows. First, the material supplying device 2 supplies the wire rod 5 having a constant length (10 to 15 cm) to the winding shaft 32. Suitable length for the automatic clipper 33 (about 5
(7 mm) wire 5 is sandwiched. Next, the motor 31 is started and the winding shaft 32 is rotated to wind the wire 5 thereon, thereby forming a semi-finished product spring. Then, the material supply machine 2 sends the semi-finished product spring to the cutting machine 4 and separates the spring from the wire rod 5, whereby the one-time spring molding process is completed. As described above, not only the molding process of the spring is simple, but also its speed is fast and there is no extra hook projection of a'shown in FIG. 1 after molding. Therefore, the usage rate of the wire rod 5 can be increased, and the cost can be saved because there is no work for cutting off the hook projections. Furthermore, the structural design of the spring molding machine is simple, the rate at which each part rubs against the wire rod 5 is low, the possibility of scratching the spring is low, and the noise is low.

As can be seen in the above description, operations other than converting the winding shaft 32 to match different diameters and lengths to match the size of the required spring, such as feeding the wire 5 and automatic clippers 33. When the wire rod 5 is sandwiched, spring winding forming process, cutting of semi-finished products, spring winding forming speed, number of windings, winding shaft 3
Parameters such as the length molded on the 2 can all be controlled by a CNC type program. So take-up shaft 3
In the outside of the orientation of the cutting machine 4 of the conversion of 2, if the above-mentioned parameters are all inputted into the computer and the molding work is proceeded automatically, the size of the spring manufactured is not only accurate (in the molding machine of the present invention, The error in the length of the manufactured spring is 0.5 mm, which is much smaller than the error in the length of the spring manufactured by a conventional molding machine, which is 4 mm.) At the same time, it is possible to complete the change of the flow work when making different sizes by the programmed manufacturing flow work and the simple mechanical structure in 5 minutes. However, since it takes about 1 hour with a conventional molding machine, its mobility is poor and it is not economically efficient.

The present invention has the following advantages. After the spring is molded, there is no extra hook protrusion, which saves man-made cost and material cost for the work. After the spring is molded, its length, inner diameter, and outer diameter are accurate, and the length error is much smaller than that produced by conventional molding machines. Therefore, it can be applied to the production of springs that require high accuracy.

Since the mechanical structure is simple, it is not necessary for the wire rod to go through a molding operation after going through several rollers as in a conventional molding machine, and the wire rod is not damaged. Due to its simple mechanical structure, it has high production efficiency, excellent quality, and competitiveness in the market. Since the mechanical structure is simple, the weight of the machine base can be greatly reduced, and the material cost and the manufacturing cost can be significantly reduced. Since the mechanical structure is simple, there are few parts, and since the servo motor is used as a power source, the required energy is greatly reduced, the friction between each part is also small, and the noise is also small. Less is.

[Brief description of drawings]

1A and 1B are schematic perspective views showing manufactured springs, wherein FIG. 1A is a spring manufactured by a conventional spring molding machine, and FIG. 1B is a spring manufactured by a spring molding machine according to an embodiment of the present invention. Is.

FIG. 2 is a schematic view showing a spring molding machine according to an embodiment of the present invention.

FIG. 3 is a plan view showing a spring molding machine according to an embodiment of the present invention.

FIG. 4 is a schematic view showing a wire rod support of a spring forming machine according to an embodiment of the present invention.

FIG. 5 is a schematic perspective view showing an operating state in which a winding shaft of a spring molding machine according to an embodiment of the present invention winds a spring, and a support base at the end thereof.

FIG. 6 is a schematic perspective view showing an operating state of winding a V-shaped base and a spring of the spring molding machine according to the embodiment of the present invention.

FIG. 7 is a schematic view showing a state where a spring is molded by the spring molding machine according to the embodiment of the present invention.

[Explanation of symbols]

1 machine 2 Material feeder 3 winder 4 cutting machine 5 wire rod 11 First rail 12 Second rail 13 center support 14 Threaded Tube 15 bearings 16 V-shaped stand 21 Donation head 31 motor 32 winding shaft 33 Automatic scissors 41 Hydraulic propulsion device 42 cutter 61 Support shaft 62 wire board 63 motor 64 belt 321 central screw hole 331 pinched head

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21F 35/00

Claims (8)

(57) [Claims] 1. A machine base having a first rail and a second rail, and a material feeder capable of reciprocatingly installed on the second rail of the machine base and capable of supplying a wire material for a spring. , A rotatable winding shaft which is installed on the upper part of the machine base and winds the wire rod to form a semi-finished product spring; an automatic nipping device which is installed above the winding shaft and which clamps the wire rod and can rotate together with the winding shaft. And a winding machine having a motor for driving the winding shaft, and a semi-finished product spring movably provided on the first rail of the machine base and facing the winding machine, and supplied by the material supply machine. And a cutting machine for cutting, and a threaded center hole is provided at the center of the end of the winding shaft.
Formed, the bearing is provided on the outer periphery and is threaded inside
A threaded tube is provided that is screwed into the core hole,
It is provided at the bottom of the threaded tube to support the bearing
A V-shaped base for locating the center is provided, and when the winding shaft starts winding of the wire rod, the motor of the wire rod support is started to supply the wire rod on the wire rod support, and the winding is performed. When the wire rod is wound around the shaft for a predetermined length, the winding shaft and the motor of the wire rod support stop at the same time, so that the wire rod support also stops rotating, and the cutting machine cuts the semi-finished product spring. Then, the winding shaft starts the next molding and continuously molds the spring. 2. The spring forming machine according to claim 1, further comprising a wire rod support for supplying the wire rod in the vicinity of the material feeder. 3. The wire rod support is a support shaft, a wire rod having a center portion supported by the support shaft around which the wire rod is wound, a belt that circulates below the support shaft, and a motor that drives the belt. The spring molding machine according to claim 2, further comprising: 4. The spring molding machine according to claim 1, wherein a center support for supporting the end of the winding shaft is provided near the end of the winding shaft. 5. The spring molding machine according to claim 1, wherein the winding shaft has a length and an outer diameter that can be changed according to a size of a spring to be generated. 6. The spring molding machine according to claim 1, wherein a rail on which the cutting machine can be movably mounted is provided on an upper portion of the machine base. 7. The spring molding machine according to claim 1, wherein the cutter comprises a hydraulic propulsion device and a cutter assembled on the hydraulic propulsion device. 8. The spring according to claim 1, wherein the material feeder is provided with a feed head for stably feeding the wire rod and securing the flatness of the wire rod at a front end portion thereof. Molding machine.