KR20010069549A - manufacturing method and device for spiral spring - Google Patents

Abstract

PURPOSE: A method and an apparatus for manufacturing a spiral spring are provided which guarantees uniformed load without formation of uniformed pitch and belly, the manufacturing time is shortened, and a spindle having an axis perpendicular to the transferring direction is not needed. CONSTITUTION: The method comprises the steps of transferring a spring material; bending the end part of the transferred spring material; coiling the spring material by forcibly contacting the end part bended spring material so as to obtain uniformed pitch; simultaneously forming hooks of the coiled spring material and cutting the hooks; and continuously bending the end part of the transferred afterward along with the cutting step. The apparatus comprises a feed roll (10) transferring a spring material; a first slider (120) bending the end part of the spring material (20) sliden in the transferring direction and transferred; a second slider (130), wherein the second slider (130) has a contact part contacting with the end part bended spring material, the contact part is contacted with the end part bended spring material so that a distance between the contacted one side and the center of the coiled spring material is getting wider before forming a pitch since a distance to be sliden is shortly adjusted as time passes by; and a pair of third and fourth sliders (141,142), wherein the third and fourth sliders (141,142) have each corresponding hook shaped parts and cutting parts each of which are oppositely sliden and pressed so as to be cut at the same time when the hook of the spring material coiled by the second slider is formed.

Description

Manufacturing method and device for spiral spring

TECHNICAL FIELD The present invention relates to a method and apparatus for manufacturing springs, and more particularly, to a method and apparatus for manufacturing a spiral spring.

Springs are also called springs. Springs in spring balances and sofas, valve springs for safety valves, and leaf springs that support automobile wheels are made of metal elasticity.

The material of the spring is most often the steel which has been heat-treated appropriately, and other metal materials, such as phosphor bronze and nickel alloy, are used. Rubber or air may also be used as a spring.

Metal springs include coil (helical) springs, ring springs, and dish springs. The coil spring is a cylindrical screw-shaped wound of rod-shaped metal materials such as round steel and angular steel, which can be used for tension or compression. Compression coil springs can be used in two or three layers. You can also make The leaf spring is one piece, but many sheets are used. Where a large external force is applied, a trapezoidal or triangular leaf spring is used. It is most commonly used in automobiles and railway vehicles.

Spiral or threaded springs, also known as winding springs, are made by winding strips of steel and used for watches. The mechanical properties of the spring are also important for improving elastic properties, fatigue limits, hardness, and heat treatment.

The present invention relates to a method of manufacturing a spiral spring and an apparatus thereof, particularly shown in Fig. 1A.

In the conventional method for manufacturing spiral springs, a spring material (hereinafter referred to as a "spring material"), which is a wire rod or a plate to be transported, is fitted into a hole of a spindle having a hole formed at an end thereof, and the spring material inserted into the hole by the first rotation of the spindle is It is bent to form a bending portion 2 of the central portion of the spiral spring, and then the spring material is wound along the outer circumference of the spindle as the spindle rotates. This is called winding or coiling operation. In this coiling step, the spring material is forced to the spindle. On the other hand, the hole is formed at the end of the spindle wound spring portion is called the inner diameter guide.

Then, the hook-shaped slide is cut while pressing the spring material conveyed from the rear of the spindle to form the hook 4. The spring then falls to the bottom of the manufacturing apparatus, i.e. free fall, for which the spindle must be reversed. This is because without reverse rotation, the wound spring is difficult to separate from the spindle.

By the way, the conventional spiral spring manufacturing method, the spring material is tightly wound and then partially reversed and released, and the pitch is determined while being separated from the spindle by free fall. In this process, the pitch 6 is not uniformly controlled. Since it depends on its elasticity, the spacing adjustment also has a disadvantage in that the desired load cannot be obtained uniformly. The life of the spring can be said to be a uniform load guarantee, it is difficult to properly recognize the quality of the spring that the uniform load is not guaranteed.

Another problem is that the ship comes out. According to the conventional method, although there is a process of unwinding by rotating in reverse, the ship 8 comes out as shown in FIG. This also adversely affects the uniform load guarantee, as well as difficult to install when used in some compact products there is a problem that becomes a defective product.

In addition, according to the conventional method, since a reverse coiling operation is required and it is not continuous transfer, it takes about 2 seconds to make one spiral spring, and thus there is a problem of low work yield.

In addition, since a spindle having a shaft perpendicular to the conveying direction is required, the overall volume of the device is problematic.

The present invention has been made to solve the above problems, an object of the present invention is to provide a method and apparatus for producing a spiral spring is a uniform load and a uniform load is guaranteed.

Another object of the present invention is to provide a spring manufacturing method and apparatus which can shorten the manufacturing time.

It is yet another object of the present invention to provide a spiral spring manufacturing method and apparatus which does not require a spindle having an axis perpendicular to the conveying direction.

1A is a plan view of a spiral spring,

Figure 1B is a side view showing that the belly of the conventional spiral spring is formed,

2 is a schematic plan view of a spiral spring manufacturing apparatus according to the present invention,

3 to 6 are schematic plan views according to manufacturing steps in the apparatus of FIG.

7 is a schematic partial cross-sectional side view of FIG. 2;

8 is a schematic plan view of another embodiment of the present invention;

9 is a flowchart illustrating a manufacturing method using the apparatus according to the present invention.

* Brief description of symbols for the main parts of the drawings *

10: feeder roller 20; Spring material

110: drawing part 120: bending part (first slider)

130: coiling part (second slider)

141, 142: hook forming portion (third, fourth slider)

106: air cylinder

In order to achieve the above object, the present invention comprises the steps of continuously conveying the spring material; Bending the end of the transferred spring material; Forcibly contacting and coiling the spring member having the end bent; Cutting said coiled spring material simultaneously with forming a hook; It provides a spiral spring manufacturing method comprising the step of bending the end of the spring material to be conveyed later.

The conveyance of the spring material is preferably made by a feed roller, and the feed rate is also variable as necessary.

The present invention also provides a feeder for conveying the spring material; A first slide slid in the feed direction to bend the end of the spring material conveyed by the feeder; In order to form a desired pitch, the end has a contact portion in contact with the bent spring material, and the distance sliding with time is shortened so that the distance between the contacting side and the center of the spring material being wound is gradually increased. A second slider; Provided is a spiral spring manufacturing apparatus including a pair of third and fourth sliders having a hook-shaped portion and a cut portion that are slid and pressed to cut simultaneously with the hook formation of the spring material wound by the first slider.

In the present invention, the contact portion of the second slider may be in the form of a roller.

The feeder preferably conveys the spring material continuously.

Each of the sliders (adjustable) can be adjusted by the rotation of the cam behind the slide to adjust the forward, backward and slide distances. At this time, each cam for operating each slider may be rotated by each small gear meshing with one standby gear.

As another example, each slider can be driven by a separate cylinder or servomotor, preferably each cylinder is a hydraulic cylinder.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic plan view of an apparatus for manufacturing spiral springs according to the present invention.

As shown, the manufacturing apparatus of the present invention and the roller feeder 10 for forcibly transporting the spring material 20, such as wire or plate; It is largely divided into a spring manufacturing unit 100 for producing a spring by using the spring material transferred from the roller feeder.

The shape of the roller feeder 10 is an example and various types of feeders may be applied, which is not the core of the present invention, and may be a variable and speed variable as long as it is a means for continuously conveying the spring material. Accordingly, the spring material 20 may be transferred at a constant speed. If the speed is variable, other components of the spring manufacturing unit 100 may be interlocked accordingly.

The spring manufacturing unit 100 includes a withdrawal unit 110 from which the spring material 20 is drawn out; A bending part 120 for bending an end of the spring material 20 which is transferred from the drawing part 110 and drawn out; A coiling unit 130 which coils and coils in contact with the spring member 20 at which the end is bent by the bending unit and has a variable distance; And a pair of hook forming parts 141 and 142 for forming and cutting a hook at the other end of the spring material 20 coiled by the coiling part 130.

Each of the bending part 120, the coiling part 130, and the pair of hook forming parts 141 and 142 may be referred to as a slider because they each slide. The slider lengths of the sliders are adjusted by the cams 105, and return springs 107 for forced contact between the sliders and the cams are provided. The return spring 107 is also one example and may be of other forms, as well as any slider pushed by the cam may be a means to be forcibly returned and may not be the position illustrated in the figure.

The operation relationship will be described in detail below together with the configuration.

The lead-out unit 110 is not a slide, but as a fixed element on one side is a straight line 121 to secure a space so that the end of the bending portion 120 can be slid, which is just a bending portion 120 Of course, it is also possible to have a variety of different shapes for the purpose of securing space.

3 illustrates a bending process, wherein the spring material 20 transferred through the withdrawal part 120 has the bent part 120 in a state where the end is bent about halfway in a previous manufacturing process, as will be described later. As the cam 105 rotates, the cam 105 slides in a direction facing the lead portion 110 so as to pass through the lead portion 110 to completely bend the end 10a of the spring material 20.

Thereafter, as shown in FIG. 4, the coiling unit 130 slides by the rotation of the cam 105 of the coiling unit 130 while the coiling unit 130 contacts with the spring material 20 to perform a winding operation (winding operation). At this time, the coiling unit 130 is pushed back according to the shape of the cam 105 to form an outer winding with a constant pitch in the inner winding. Here, the pitch can be adjusted by changing the shape of the cam 105 in accordance with the size of the pitch.

On the other hand, the coiling unit 130 is in contact with the spring material 20 is not in the form of the roller 132, but the winding, that is, coiling is possible only by a simple contact, it is preferable to reduce the friction force in the form of the roller 132 Do.

In addition, the slide direction of the coiling unit 130 is preferably in contact with the spring member 20 and coiled to meet at a predetermined angle with the conveying direction of the spring member 20.

FIG. 5 illustrates a process of forming a hook shape. The pair of hook portions 141 and 142 have hook-shaped portions 143a and 143b and a cut portion, as shown in FIG. Hook-shaped portions (143a) (143b) has a shape for forming the hook (4) as shown in Figure 1a, respectively, in the yin and yang, the cut portion is in the shape of a slit groove 145 on one side 142, The other side 141 is in the shape of a protrusion 147 that can be fitted into the groove 145.

Preferably, the pair of hook portions 141 and 142 slide in a direction substantially perpendicular to the conveying direction.

On the other hand, the shapes of the cams driving the first hook portion 141 (third slider) and the second hook portion 142 (fourth slider) are different from each other. As shown in FIG. 6, the second hook portion 142 is returned to the right side of the drawing after cutting and hook formation, while the first hook portion 141 is further advanced to the right again to push the end of the newly conveyed spring material 20 to the right to bend halfway. This can be understood in consideration of the shape of each cam, in particular, the cam driving the first hook portion 141 can be seen that the diameter is two places (d1) (d2) and d2 is longer than d1.

7 is a view illustrating the driving relationship of the cam 105, the cam 105 is rotated by the small gear 112, each of the small gear 112 is meshed by a single standby gear 114 Of course, they can be interlocked or operated separately. The direction of each cam 105 in FIGS. 2 to 6 is shown roughly, and may be operated separately, and is not illustrated.

In the case of using the standby gear 114, it is driven by the motor M and can be powered by the gear train 116 of various forms or configurations. It may be appropriately selected in consideration of M) and the standby gear 114 and the rotational speed.

FIG. 8 is another example of the present invention, similar to FIG. 2, but each slider 120, 130, 141, 142 has a separate cylinder 106 operated by a controller not shown without using a cam. It is shown that it may be driven by.

The cylinder 106 is preferably a hydraulic cylinder, and of course, each slider of the present invention may be operated by a servo motor.

9 is a schematic flowchart showing an operation relationship in a flow according to the apparatus according to the present invention described above.

First, the step (S1) of completely bending the end (20a) of the spring member 20 half bent in the previous step by the bending unit 120 (first slider); After the winding step (S2) by the contact between the coiling unit 130 (second slider) and the spring material 20; Forming a hook of the spring material 20 wound through the pair of hook portions 141 and 142 (third and fourth sliders) and simultaneously cutting the hook; The third slider is configured to bend the end of the spring material conveyed through the withdrawal unit (110) halfway. On the other hand, the finished product is collected by automatic falling.

As described above, according to the present invention, since it is possible to manufacture a spiral spring without a spindle, there is an advantage that can greatly reduce the size and equipment cost of the device.

In addition, since the pitch of the spiral spring can be adjusted uniformly, there is an advantage that the uniform load of the finished spring can be ensured.

In addition, since there is no need for reverse rotation of the spindle, the interference does not occur and the ship is eliminated.

In addition, unlike the conventional method, when the method of the present invention is used, one manufacturing time is greatly reduced to about 0.7 to 0.8 seconds, thereby improving work yield.

Claims (6)

Conveying the spring material; Bending the end of the transferred spring material; Coiling the end of the spring member to be in forced contact with a uniform pitch; Simultaneously performing hook formation and cutting of the coiled spring material; Bending the end of the spring material which is subsequently conveyed after the cutting step Spiral spring manufacturing method comprising a The method of claim 1, The spring material is conveyed by a feeder roller, the bending is made by the slide of the first slider, the coiling is made by the second slider, and the hooking and cutting is done by the third and fourth sliders. Method of manufacturing spiral spring A feeder for conveying spring material; A first slider for bending the end of the spring material which is slid in the conveying direction and conveyed; The second end has a contact portion in contact with the spring member is bent and the distance sliding with time is adjusted shortly so that the distance between the contacting one side and the center of the spring member being wound is gradually increased to form a pitch With a slider; A pair of third and fourth sliders each having a hook-shaped portion and a cut portion corresponding to each other, and are slid to face each other and simultaneously squeezed while simultaneously cutting and forming hooks of the spring material wound by the second slider. Spiral spring manufacturing apparatus comprising a The method of claim 3, wherein The contact portion of the second slide spiral spring manufacturing apparatus The method according to claim 3 or 4, Spiral spring manufacturing apparatus further comprises a cam rotating in contact with the rear of each slider to adjust the slide distance of the first, second, third and fourth sliders The method according to claim 3 or 4, Spiral spring manufacturing apparatus further comprising a cylinder for driving the first, second, third and fourth sliders, respectively